RU2700995C1 - Compressed air preparation system, in particular for installation of compressed air preparation of commercial vehicle - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: compressed air preparation system for commercial vehicle compressed air preparation plant comprises compressed air preparation device (30), air-drying cartridge (10) and sealing ring (68) for sealing between compressed air preparation device (30). Air-drying cartridge (10) comprises housing (14) with closed cover (16), drying agent (60) arranged in cartridge housing (14), fastening flange (18) for closing of case (14) open end face side facing from cover (16) and fastening of air-drying cartridge (10) on compressed air preparation device (30) and lower plate (26). Lower plate (26) is located on the side of mounting flange (18), which is facing from cover (16) of cartridge body (14) and has mounting section (72) passing from mounting flange (18), forming seat (70) for arrangement of sealing ring (68) on side of lengthwise axis (12) of air-drying cartridge side of mounting section (72). At that, mounting section (72) creates for O-ring (68) in radial direction (13r) perpendicular to longitudinal axis (12) of air-drying cartridge (10) an external stop and passes perpendicular to mounting section (72) on the side facing away from housing (14) of cartridge, at least partially under sealing ring (68).

EFFECT: disclosed is compressed air preparation system, in particular for installation of compressed air preparation of commercial vehicle.

17 cl, 9 dwg

Description

The invention relates to an air drying cartridge and a compressed air preparation device, as well as to a compressed air preparation system with such a compressed air preparation device and such an air drying cartridge, respectively, in particular, for installing a compressed air preparation for commercial vehicles.

Such compressed air systems are used, for example, in commercial vehicles, such as trucks and tractors. They often have one or more consumers of compressed air, such as brake systems or air suspensions, which must be supplied with compressed air. Compressed air is usually generated by a compressor, for example a reciprocating compressor driven by a vehicle’s drive engine. In order to ensure uninterrupted operation of consumers of compressed air, the compressed air created by the compressor should usually be further prepared. In the compressed air treatment plants provided for this, it is cleaned of dirt particles that were already contained in the sucked air, as well as of oil and soot particles that enter the compressed air from the compressor during compression, and the moisture in the compressed air is separated. For this purpose, compressed air treatment plants for commercial vehicles typically have air-drying cartridges that remove moisture from the compressed air and can predominantly absorb oil and dirt particles.

Conventional air drying cartridges disclosed, for example, in DE 102013103066 A1, comprise a housing with a closed lid, a drying agent housed in the housing and a mounting flange for closing the end face of the housing facing the lid and securing the cartridge to the compressed air preparation device. In this case, usually on the end side of the cartridge facing the cover, a lower plate is provided, which, on the one hand, is connected to the mounting flange, and, on the other hand, by means of seaming, to the housing. This lower plate is molded in such a way that on its outer side facing away from the mounting flange, it forms an annular socket into which a four-sided sealing ring is inserted or inserted, which should cause sealing between the cartridge and the compressed air preparation device.

The basis of the invention is the task of creating an improved compressed air preparation system, which would simplify the installation of the sealing ring on the air drying cartridge and the installation of the air drying cartridge on the compressed air preparation device.

This problem is solved by means of technical solutions, characterized by signs of independent claims. Preferred embodiments of the invention are the subject of the dependent claims.

The proposed air drying cartridge comprises a housing with a closed lid, a drying agent located in the housing, a mounting flange for closing the front side of the housing facing the cover and securing the cartridge to the compressed air preparation device, and a lower plate that is provided on the front side of the cartridge facing the cover and is located on the facing side from the cover to the side of the mounting flange. The lower plate has a landing portion extending from the mounting flange, forming a socket for placing a sealing ring on the side of the landing portion facing the longitudinal axis of the cartridge. This landing section forms in the radial direction perpendicular to the longitudinal axis of the cartridge an external stop for the sealing ring placed in the socket. In addition, this landing section extends on the side facing away from the housing, at least partially beneath the O-ring placed in the housing.

According to the invention, it is proposed to place on the side of the mounting flange facing away from the housing cover a specially shaped lower plate. By means of a seating portion extending from the mounting flange, the lower plate forms a seat into which an o-ring can be inserted. Since the landing portion of the lower plate at least partially covers the sealing ring from below, the latter can be held in the socket preferably without being clamped, so that it can be pre-mounted without problems and reliably before mounting the cartridge on the compressed air preparation device. As a result, it is possible, in general, to simplify the installation of the cartridge on the compressed air preparation device, since additional and / or laborious stages of the preliminary fixation of the sealing ring may disappear.

In the proposed sealing concept, the o-ring is placed and compressed mainly in a wedge-shaped socket. When mounting a cartridge on a compressed air preparation device, the sealing ring is mainly stuck in this socket, and installation can be carried out with less screwing forces than in traditional systems. On the other hand, the o-ring in the wedge-shaped seat under pressure during operation can create a higher sealing effect, since compressed air presses it in preferably until it is wedge-shaped.

In one preferred embodiment, the landing portion of the bottom plate extends with its free end underneath the o-ring in the socket. In this embodiment, the socket can be made mainly for placement of the sealing ring between the bottom plate and the mounting flange.

In another preferred embodiment, the landing portion of the lower plate is formed by its curved portion on itself. In this embodiment, the socket can be made mainly for placing the o-ring between the bottom plate and the compressed air preparation device. In addition, in this embodiment, the predominantly free end of the bottom plate may at least partially cover a portion of the mounting flange, for example through an air flow hole in the mounting flange, to achieve a force short circuit between the bottom plate and the mounting flange.

In another preferred embodiment, the lower plate has at least one gear element which is engaged with the side of the mounting flange facing away from the cartridge case cover. The gear elements are made in the lower plate, for example, in the form of extrusions or profiles. Using such gear elements, it is possible to improve the power circuit between the bottom plate and the mounting flange, which is preferable when screwing the cartridge with the mounting fitting of the mounting flange on the compressed air preparation device.

In one preferred embodiment, the landing portion of the bottom plate is made at least partially curved. Due to this design, the socket can preferably be used to accommodate o-rings with curved surfaces. In particular, thanks to this design, mainly O-rings can be used. Compared to quadrangular seals, round seals are less expensive. However, in the framework of the invention, seals of essentially any cross-sectional shape can be used, for example, rectangular, square, triangular, polygonal, round, oval, etc.

In another preferred embodiment, the mounting flange on its outer side facing away from the lid of the cartridge case, at least in the area of the seat for the o-ring, is generally flat. This design of the mounting flange is particularly easy to manufacture and, therefore, inexpensive. In addition, a large flat section or the entire flat mounting flange provides variable positioning of the o-ring in radially different positions by fitting only the bottom plate.

In another preferred embodiment, the lower plate has a connecting portion for connection to the cartridge housing, the connecting portion extending, for example, in the longitudinal direction, generally parallel to the longitudinal axis of the cartridge from the mounting flange. Thanks to this design, in general, the shape stability of the lower plate can be increased. As a result, the lower plate can be made thinner and / or from a less form-resistant material.

Advantageously, the lower plate is connected to the cartridge housing, preferably via a connecting portion. This connection can be implemented preferably by rolling, welding, soldering, gluing, or a combination of these technologies. Alternatively, this connection can also be realized by making the cartridge housing integrally with the bottom plate.

The bottom plate is made and made preferably solid. However, the bottom plate can be composed of several components, for example, from the first part in the form of a conventional lower plate or a portion of the lower plate and the second part in the form of an adapter specially made according to the invention.

The proposed compressed air preparation device comprises a connecting fitting for attaching the air drying cartridge to the compressed air preparation device, wherein the longitudinal axis of the connecting fitting extends mainly coaxially to the longitudinal axis of the air drying cartridge when the latter is fixed to the compressed air preparation device. The proposed device for the preparation of compressed air further comprises a pressure section, which is provided in the radial direction perpendicular to the longitudinal axis of the air drying cartridge outside the connecting fitting. This pressure section has a support protrusion extending in the direction of the air drying cartridge, which is located in the radial direction perpendicular to the longitudinal axis of the air drying cartridge inside the sealing ring between the compressed air preparation device and the air drying cartridge and forms an internal stop for it in the radial direction.

According to the invention, it is proposed to equip the compressed air preparation device radially outside the connecting fitting with a special pressure section. Due to the support protrusion that holds the sealing ring in the radial direction in the desired position, additional and / or time-consuming measures for pre-fixing the sealing ring on the air drying cartridge or compressed air preparation device before mounting the cartridge on it may disappear. As a result, the installation of the air drying cartridge on the compressed air preparation device is simplified.

In one preferred embodiment, the support protrusion of the pressure portion is designed so that it is spaced apart from it in the mounted state of the air drying cartridge in a longitudinal direction parallel to the longitudinal axis of the air drying cartridge. Thanks to this design, the support protrusion does not interfere with the installation of the air drying cartridge on the compressed air preparation device, limiting the connection path of the connecting fitting. As a result, the sealing ring inserted between the air drying cartridge and the compressed air preparation device is compressed with sufficient pressure to achieve a sufficient sealing effect.

In one preferred embodiment, the pressure portion has a support edge that extends from the support protrusion in the radial direction outward, so that this support edge in the mounted state of the air drying cartridge extends at least partially below the sealing ring to be placed. This abutment edge of the pressure portion may form additional support for the inserted o-ring in the longitudinal direction.

In one preferred embodiment, the pressure portion has a recess in the radial direction outside the abutment protrusion, which is offset backward from the abutment edge. In this recess can be placed, for example, the free end of the lower plate located on the air drying cartridge to accommodate the sealing ring. Advantageously, this depression of the pressure portion is made trapezoidal or wedge-shaped in order to create a better stop for the free end of the lower plate, which also provides greater manufacturing tolerances of the components involved.

The pressure section is preferably made integrally with the compressed air preparation device. The pressure section can also be provided in the form of an adapter as a separate structural element, which is located on the compressed air preparation device, for example, screwed onto it.

The invention also relates to a compressed air preparation system with the compressed air preparation device described above, an air drying cartridge and a sealing ring for sealing between the air drying cartridge and the compressed air preparation device.

The advantages of the above described air drying cartridge are particularly apparent in combination with the compressed air preparation device described above. Similarly, the advantages of the compressed air preparation device described above are especially apparent in combination with the air drying cartridge described above. A special shape of the bottom plate on the air drying cartridge and a special shape of the pressure section of the compressed air preparation device place a sealing ring between them and compress it so that it provides reliable and sufficient sealing between the air drying cartridge and the compressed air preparation device. In addition, the o-ring before mounting the air drying cartridge on the compressed air preparation device can be simply inserted between the bottom plate and the mounting flange of the air drying cartridge, after which the latter can be mounted without problems on the compressed air preparation device. In principle, the proposed air drying cartridge and the compressed air preparation device can also be advantageously used independently.

The sealing ring is made mainly in the form of a sealing ring of circular cross section. As indicated above, the invention is not limited, however, to an o-ring of this sectional shape.

In one embodiment, an elastic element may be located between the air drying cartridge and the abutment protrusion of the pressure portion of the compressed air preparation device. This option may be preferable, in particular, in the case of backward compatible use of an air drying cartridge in combination with conventional compressed air preparation devices. Due to the intermediate elastic element, which can optionally be pre-fixed also on the air-drying cartridge, it is possible to preferably tighten the connection between it and the compressed air preparation device and thus compress the inserted rectangular sealing ring.

The invention is preferably suitable for use in compressed air treatment plants of commercial vehicles.

The above described and other advantages, features and applications of the invention become better understood from the following description of various embodiments with reference to the accompanying drawings, in which for the most part the following is schematically presented:

FIG. 1 is a partial sectional view of a compressed air preparation system in accordance with a first embodiment of the invention;

FIG. 2 is an enlarged detailed view of the connection between the air drying cartridge and the compressed air preparation device of the compressed air preparation system of FIG. 1 in accordance with an example embodiment of the invention;

FIG. 3 is an enlarged detailed view of an alternative connection between an air drying cartridge and a compressed preparation device in accordance with another embodiment of the invention;

FIG. 4 is a partial sectional view of a compressed air preparation system in accordance with a second embodiment of the invention;

FIG. 5 is an enlarged detailed view of the connection between the air drying cartridge and the compressed air preparation device of the compressed air preparation system of FIG. 4 in accordance with an example embodiment of the invention;

FIG. 6 is an enlarged detailed view of an alternative connection between an air drying cartridge and a compressed air preparation device in accordance with another embodiment of the invention;

FIG. 7 is an enlarged detailed view of an alternative connection between an air drying cartridge and a compressed air preparation device in accordance with yet another embodiment of the invention;

FIG. 8 is an enlarged detailed view of an alternative connection between an air drying cartridge and a compressed air preparation device in accordance with yet another embodiment of the invention;

FIG. 9 is a partial sectional view of a compressed air preparation system in accordance with a third embodiment of the invention.

In FIG. 1 shows the design of a compressed air preparation system with the proposed air drying cartridge and compressed air preparation device in accordance with a first embodiment of the invention.

The air-drying cartridge 10 is made generally rotationally symmetrical of the longitudinal axis 12 and comprises a generally cylindrical or bowl-shaped body 14 with a closed lid 16, made in the form of a sheet subjected to deep drawing. The open end face of the housing 14 facing away from the cover 16 is closed by a mounting flange 18 (preferably made of metal). The mounting flange 18 is predominantly firmly and hermetically connected to the housing 14, for example, welded, glued, etc.

The mounting flange 18 has one inlet 20, for example, in the form of a circular ring, or several inlet openings 20 located along the circular ring, and a central outlet 24, for example round. The outlet 24 is located radially across the longitudinal axis 12 inside the inlet (s) 20. The terms “inlet” and “outlet” refer in this connection to the direction a of the fluid flowing through the air drying cartridge in normal operation for drying and cleaning the fluid. In the regeneration mode, the flow through the air drying cartridge 10 and, thus, the inlet 20 and outlet 24 holes occurs in the opposite direction b.

The central outlet 24 is bounded by a mounting fitting 22 of a mounting flange 18. This mounting fitting 22 is provided with an internal thread.

The air dryer cartridge 10 is mounted or mounted on the compressed air preparation device 30, which is part of the compressed air preparation unit. The device 30 includes a connecting fitting 32 provided with an external thread. Thus, the air drying cartridge 10 by the mounting fitting 22 of its mounting flange 18 can be screwed onto the connecting fitting 32 of the device 30. The threaded connection 34 between the fittings 22, 32 forms a detachable, however fluid-tight connection of the air drying cartridge 10 and the compressed air preparation device 30. In the mounted state, the longitudinal axis 12 of the air drying cartridge 10 and the longitudinal axis of the connecting fitting 32 are coaxial to each other.

The compressed air preparation device 30 has a first opening 36, for example, in the form of a circular ring, or several holes 36 located along the circular ring, which (which) are in the mounted state of the air drying cartridge 10 (are) in fluid connection with the inlet (s) 20 mounting flange 18. The compressed air preparation device 30 further has a second opening 38, for example a round one, which in the mounted state of the air drying cartridge 10 is in fluid communication with fastening hole 24 of the mounting flange 18. Arrows a indicate the direction of fluid flow in normal operation of the air drying cartridge 10, and arrows b indicate the direction of fluid flow in the regeneration mode of the air drying cartridge 10.

As seen in FIG. 1, the air dryer cartridge 10 further comprises an inner case 40, which consists of first parts 40a and second 40b and is made primarily of plastic. The first part 40a of the inner casing 40 is located radially across the longitudinal axis 12 outside of its second part 40b. In the example of FIG. 1, the housing 14 and the inner housing 40 of the cartridge form between themselves a space for accommodating a drying agent 60 (e.g., silica gel).

The first part 40a of the inner housing 40 is provided with several openings 42 in fluid connection with the inlet 20 of the mounting flange 18. In normal operation of the air drying cartridge 10, compressed air can flow from the compressed air preparation device 30 through the inlet 20 of the mounting flange 18 and openings 42 of the inner case 40 inside the cartridge case 14.

Between the inlet (s) 20 and the openings 42 there is a filter device 44 in the form of a coalescent or oil filter. In this example, the filter device 44 is oriented, for example, mainly parallel to the longitudinal axis 12 of the air drying cartridge 10, so that compressed air flows through it in the radial direction. By means of a filtering device 44, compressed air can be cleaned before it flows through a drying agent 60 in the housing 14 of the air-drying cartridge 10. The filtering device 44 is preferably surrounded by a so-called winding material 46, which can be formed by a porous material, non-woven material, etc. .P. and lets air in. The wrapping material 46 prevents contamination of the drying agent 60 with oil.

A bypass 48 with a check valve 52 is provided under the filter device 44. In the normal operation of the air drying cartridge 10, the check valve 52 prevents the flow of compressed air from the inlet 20 past the filter device 44 through the bypass 48 without cleaning into the drying agent 60, however, in the regeneration mode of the air drying cartridge 10 passes the air flow past the filter device 44. The check valve 52 is preferably made of plastic (eg, elastomer). In this example, it relies on the housing 14 of the cartridge.

As seen in FIG. 1, a sealing collar 54 is provided on the first part 40a of the inner housing 40 in the area of the mounting fitting 22, which is preferably integrally formed with it and preferably elastically stretched to the mounting fitting 22. A sealing collar is provided in the area of the cartridge housing 14, which is made preferably integrally with the first part 40a of the inner housing 40 and is preferably elastically tensioned to the cartridge housing 14.

The second part 40b of the inner case 40 has openings 56 in the central region that connect the interior of the cartridge case 14 to the outlet 24. A sealing collar 58 is provided on the radially external peripheral edge of the second part 40b, which is preferably integrally formed and preferably resiliently tensioned to the first part 40a of the inner housing 40.

The second part 40b of the inner housing 40 is movable in the axial direction of the housing 14 of the air drying cartridge 10, i.e. parallel or coaxial to its longitudinal axis 12. The tension element 62 in the form of a compression spring, which rests on the first part 40a of the inner housing 40, presses on its second part 40b in the direction of the housing cover 16, compressing the drying agent 60. At the same time, due to the sealing collar 58 on the second part 40b of the inner casing 40, the latter remains fluid-tight between its two parts 40a, 40b.

As seen in FIG. 1, the second part 40b of the inner casing 40 is configured such that a part of the drying agent 60 is located in the spatial zone 66 in the radial direction inside the tensioning element 62. Due to this optimal use of the space inside the casing 14 of the air-drying cartridge 10, the latter can be performed with equal drying performance less i.e. smaller diameter and / or lower height.

In order to achieve fluid tight sealing between the compressed air preparation device 30 and the air drying cartridge 10 in the radial direction, an o-ring 68, for example an o-ring, is located between these two elements.

In FIG. 2 shows an enlarged partial view of a first embodiment of this connection between the air drying cartridge 10 and the compressed air preparation device 30.

As seen in FIG. 1 and 2, on the end side facing away from the cover 16 of the housing 14 of the cartridge, more precisely, on the outside facing away from the cover 16 of the housing 14 (in FIGS. 1 and 2 below) of the mounting flange 18, a lower plate 26 is provided. It is connected by means of a connecting portion 27 with a body of 14 rounds. In the example of FIG. 1 and 2, this compound 28 is formed by rolling.

Starting from the connecting portion 27 at the radially external end 13r, the lower plate 26 extends first in the radial direction 13r along the mounting flange 18 inward. In this case, the lower plate 26 can also be connected to the mounting flange 18, for example, welded, soldered or glued. If no firm connection is provided between the bottom plate 26 and the mounting flange 18, it preferably has several gear elements 29 which, when mounting the air drying cartridge 10 on the compressed air preparation device 30, can enter the lower side of the mounting flange 18, creating a corresponding power circuit between these two components 18, 26. The gear elements 29 in the lower plate 26 are made, for example, in the form of extrusions or profiles.

In its radially internal end region 13r, which lies radially still outside the inlet (s) 20 of the mounting flange 18, the lower plate 26 has a seating portion 72. In this example, it is curved and extends from the mounting flange 18. This landing section 72 forms a wedge-shaped seat 70 for accommodating a sealing ring 68, which in the case of a curved landing section 72 can be made preferably in the form of a sealing ring of circular cross section. In this case, the landing portion 72 of the lower plate 26 extends at least partially under the sealing ring 68 inserted into the socket 70.

The mounting flange 18 of the air-drying cartridge 10 is made predominantly mainly flat, so that it, at least also in the area formed by the lower plate 26 of the socket 70, has a flat outer side.

Prior to mounting the air drying cartridge 10 on the compressed air preparation device 30, the sealing ring 68 can be easily and radially inserted from the inside into the socket 70 between the bottom plate 26 and the mounting flange 18. Thus, the sealing ring 68 is held on the air drying cartridge 10 while it will not be mounted on the compressed air preparation device 30.

In order to compress the sealing ring 68 when installing the air drying cartridge 10 on the compressed air preparation device 30 and thereby achieve a sealing effect between the air drying cartridge 10 and the compressed air preparation device 30 in the radial direction 13r, the compressed air preparation device 30 has a pressure section 75 of a special shape which, in cooperation with the lower plate 26 and the mounting flange 18, holds the sealing ring 68 in position in the socket 70, compressing it. As seen in FIG. 1, this pressure portion 75 is provided in a radial direction perpendicular to the longitudinal axis 12 of the air drying cartridge 10 outside the connecting fitting 32 of the compressed air preparation device 30.

As can be seen, in particular, in FIG. 2, the pressing portion 75 has a supporting edge 82, which is, for example, made in the form of an end of the lateral side 80 of the pressing portion 75 facing the air drying cartridge 10. In addition, the pressing region 75 has a supporting protrusion 76 extending in the direction of the air drying cartridge 10. It is positioned in radial direction inside the placed o-ring 68 and forms a radially internal stop for it.

In order to exert sufficient clamping force F on the O-ring 68 to achieve a sufficient sealing action, the support protrusion 76 of the pressure portion 75 extends from the abutment edge 82 in the direction of the air drying cartridge 10 to a size smaller than the size of the O-ring 68 in the longitudinal direction 13l parallel to the longitudinal axis 12 air drying cartridge 10 in its unmounted condition. Advantageously, this size is chosen even smaller than the size of the sealing ring 68 in the longitudinal direction 13l parallel to the longitudinal axis 12 of the air drying cartridge 10 in its mounted state, so that in the mounted state of the air drying cartridge 10 there is a small gap between the mounting flange 18 and the support protrusion 76 of the pressure section 75.

Further, the pressure portion 75 has a recess 84 in the radial direction 13r between the abutment edge 82 and the abutment protrusion 76. It is also offset backward from the abutment edge 82, so that when installing the air drying cartridge 10 on the compressed air preparation device 30, the free end 74 of the lower plate 26 can be placed in this recess 84 and can, if necessary, also rely in it.

When screwing the air drying cartridge 10 with the compressed air preparation device 30, the pressure portion 75 presses its supporting edge 82 against the lower plate 26, thereby displacing the sealing ring 68 slightly upward in the direction of the air drying cartridge 10, and the sealing ring 68 is slightly compressed between the lower plate 26 and mounting flange 18, however, in comparison with traditional sealing concepts with rectangular sealing rings in the grooves of the lower plate, less pig efforts are required chivaniya. In this case, the sealing ring 68 due to the landing section 72 of the lower plate 26 and the support protrusion 76 of the pressure section 75 is held in position in the radial direction 13r. During operation, compressed air presses down on the O-ring 68 in the wedge-shaped seat 70 in the direction of the compressed air preparation device 30, which further enhances the sealing effect of the O-ring 68. This results in fluid tight sealing in the radial direction 13r between the compressed air preparation device 30 and the air drying cartridge 10.

In FIG. 3 similarly to FIG. 2 is an enlarged partial view of an alternative embodiment of a connection between the air drying cartridge 10 and the compressed air preparation device 30.

In this embodiment, the proposed air drying cartridge 10 (for example, from FIG. 1) is connected to a conventional compressed air preparation device 30. In other words, the proposed air drying cartridge 10 is also backward compatible with conventional compressed air preparation devices 30.

As seen in FIG. 3, the lower plate 26 is made for this purpose in such a way that it forms a groove between the connecting 27 and the seating 72, into which a rectangular O-ring 69 can be inserted / pressed. The conventional compressed air preparation device 30 is substantially flat on its side facing the air dryer cartridge 10 in the region of the lower plate 26, so that the o-ring 69 is pressed against this flat compressed air preparation device 30.

In the embodiment of FIG. 3, a socket for a sealing ring 69 of rectangular cross section is formed by connecting 27 and landing 72 sections of the lower plate 26. In an alternative embodiment (not shown), this socket can also be formed by additional shaped sections of the lower plate 26.

In FIG. 4 and 5 show the design of a compressed air preparation system with the proposed air drying cartridge and compressed air preparation device in accordance with the second example. In this case, the same structural elements, as in the first example, are indicated by the same reference positions.

The second example differs from the example described above by the connection between the air drying cartridge and the compressed air preparation device.

Thus, in particular, the lower plate 26 of the air drying cartridge 10 has a different shape than in the first example. Landing section 72 of the lower plate 26 is formed by its bent section on itself. The free end 74 of the lower plate 26 is located between the socket 70 and the mounting flange 18, i.e. in the longitudinal direction 13l above the sealing ring 68 inserted into the seat 70.

Compared to the first example, the pressure portion 75 of the compressed air preparation device 30 is simpler. In particular, it is possible to discard the abutment edge 82 under the seat 70 extending from the abutment protrusion 76 in the radial outward direction 13r.

In this example, the o-ring 68 is located in the seat 70 formed between the lower plate 26 and the support protrusion 76 of the pressure portion 75 of the compressed air preparation device 30.

In FIG. 6 similarly to FIG. 5, an enlarged partial view illustrates an alternative connection between the air drying cartridge 10 and the compressed air preparation device 30.

In this embodiment, the proposed air drying cartridge 10 (for example, from FIG. 4) is connected to a conventional compressed air preparation device 30. In other words, the proposed air drying cartridge 10 is also backward compatible with conventional compressed air preparation devices 30.

As seen in FIG. 6, the lower plate 26 is made for this purpose in such a way that it forms a groove between the connecting 27 and the seating 72, into which a rectangular o-ring 69 can be inserted / pressed. The conventional compressed air preparation device 30 is substantially flat on its side facing the air dryer cartridge 10 in the region of the lower plate 26, so that the o-ring 69 is pressed against this flat compressed air preparation device 30.

In the embodiment of FIG. 6, a socket for a sealing ring 69 of rectangular cross section is formed by connecting 27 and landing 72 sections of the lower plate 26. In an alternative embodiment (not shown), this socket can also be formed by additional shaped sections of the lower plate 26.

In other words, the embodiment of FIG. 6 is a combination of the options of FIG. 5 and 3.

In FIG. 7 similarly to FIG. 5 is an enlarged partial view of another alternative embodiment of the connection between the air drying cartridge 10 and the compressed air preparation device 30.

In this embodiment, the free end 74 of the lower plate 26 is passed through the inlet 20 in the mounting flange 18, covering the latter. Due to this, a sufficiently strong connection is created between the lower plate 26 and the mounting flange 18.

As seen in FIG. 7, a support edge 33 may optionally be provided on the mounting fitting 32 of the compressed air preparation device 30, which extends radially 13r from the mounting fitting 32 to the outside and onto which the mounting flange 18 can be supported in the mounted state of the air drying cartridge 10.

As can be seen further in FIG. 7, an abutment edge 82 may optionally be provided on the abutment protrusion 76 of the pressure portion 75 of the compressed air preparation device 30, which extends radially 13r from the abutment protrusion 76 outside the inserted sealing ring 68.

This embodiment of FIG. 7 can be similarly transferred to the variant of FIG. 6.

In FIG. 8 similarly to FIG. 2 is an enlarged partial view of another alternative embodiment of the connection between the air drying cartridge 10 and the compressed air preparation device 30.

In this embodiment, the recess 84 between the abutment edge 82 and the abutment protrusion 76 of the pressure portion 75 of the compressed air preparation device 30 is substantially trapezoidal.

The trapezoidal shape of the recess 84 provides better emphasis or better guidance of the free end 74 of the lower plate 26 therein, in particular during installation of the air drying cartridge 10 on the compressed air preparation device 30. Even with greater manufacturing tolerances, the free end of the lower plate 26 can reliably find its way to the end position in the recess 84. In addition, this can prevent excessive bending of the lower plate 26 when mounting the air drying cartridge 10.

In one embodiment, the recess 84 of the pressure portion 75 of the compressed air preparation device 30 is generally wedge-shaped.

In FIG. 9 shows the design of a compressed air preparation system with the proposed air drying cartridge and compressed air preparation device in accordance with a third example. In this case, the same structural elements, as in the examples described above, are indicated by the same reference positions.

The third example differs from the examples described above in the design of the air drying cartridge, in particular with respect to the improved use of space for accommodating the drying agent therein.

In the example of FIG. 9, the cartridge case 14, the mounting flange 18, and the inner case 40 form a space between them to accommodate a drying agent 60 (e.g., silica gel).

The first part 40a of the inner casing 40 on the wall section running parallel to the longitudinal axis 12 of the air drying cartridge 10 is provided with several openings 42 that are fluidly connected to the inlet 20 of the mounting flange 18. In normal operation of the air drying cartridge 10, compressed air can thus flow from the device 30 for the preparation of compressed air through the inlet 20 in the mounting flange 18 and the holes 42 of the inner housing 40 inside the housing 14 of the cartridge.

Equipped with openings 42, the wall of the first part 40a of the inner housing 40 is surrounded by a filter device 44 in the form of a coalescent or oil filter. For example, the filtering device 44 is wound around a wall portion of the first portion 40a of the inner housing 40 that extends substantially parallel to the longitudinal axis 12 of the air drying cartridge 10. In turn, the filtering device 44 is surrounded by so-called winding material 46.

In the example of FIG. 9, compressed air passes through a filter device 44 in a radial direction. In addition, in the example of FIG. 9, the space zone 64 is radially outside the filter device 44 also filled with a drying agent 60. Thus, the space inside the cartridge housing 14 can be optimally used to house the drying agent 60, so that less structural space is required for the drying agent 60, and the air drying cartridge 10 can smaller diameter, for example, only about 126 mm (compared to traditional air-drying cartridges with a diameter of about 140 mm). The smaller diameter, in turn, has advantages with respect to handling the air drying cartridge 10 and the necessary structural space in the compressed air preparation unit. Alternatively, for example, with a constant diameter, the height of the air drying cartridge 10 can be reduced.

A bypass 48 is provided under the filter device 44. In the first part 40a of the inner housing 40, holes 50 are made that connect the interior of the air drying cartridge 10 to the bypass 48. The bypass valve 52 is located in the bypass 48. In the normal operation of the air drying cartridge 10, the check valve 52 prevents the flow compressed air from the inlet 20 past the filter device 44 through the bypass 48 without cleaning into the drying agent 60, however, in the regeneration mode of the air drying cartridge 10 passes air flow b past the filter device 44. The check valve 52 is preferably made of plastic (eg, elastomer). It is preferably made integrally with the first part 40a of the inner housing 40.

In this design of the air drying cartridge 10, the check valve 52 is located at a distance from the wall of the housing 14 of the cartridge. Thus, it is also protected from mechanical loads that may occur, for example, due to deformations of the cartridge housing 14.

The space zone 65 radially outside the check valve 52 can also be filled with a drying agent 60. Thus, the space under the cartridge housing 14 can be even more efficiently used to place the drying agent 60.

Otherwise, the compressed air preparation system in this example corresponds to the compressed air preparation system in the first example of FIG. one.

The invention is not limited to the above-described examples of a compressed air preparation system. One of skill in the art can discover numerous variations and modifications that fall within the scope of the claims.

While the inner case 40 in the described examples consists of the first 40a and second 40b parts, it can be made in other examples as one-piece or consist of more than two parts.

While in the above examples, the compression spring 62 is located between the first 40a and second 40b parts of the inner housing 40 so that it presses on the inner second part 40b in the cartridge housing 14 in the direction of the housing cover 16 upward, in other embodiments, the compression spring 62 may be also located between the cover 16 of the housing 14 of the cartridge and the inner part of the housing for its tension in the direction of the device 30 for the preparation of compressed air.

While the non-return valve 52 and sealing cuffs 54, 58 in the described examples are made integrally with the inner case 40, these components 52, 54, 58 can be made in other examples as separate components connected to the inner case 40 .

Although not shown, in the examples shown, in the longitudinal direction 13l between the air drying cartridge 10 and the supporting protrusion 76 of the compressed air preparation device, an additional elastic element, for example a rubber ring, can be provided. The elastic element can, for example, be pre-fixed on the end side of the support protrusion or on the lower side of the mounting flange 18 or the lower plate.

Claims (18)

1. An air drying cartridge (10), in particular for installing a compressed air preparation for a commercial vehicle, comprising a housing (14) with a closed lid (16), a drying agent (60), a mounting flange (18) for closing the front side of the cartridge housing (14) facing from the cover (16) and fixing the air drying cartridge (10) to the compressed air preparation device (30) and the lower plate (26), which is provided on the front side of the air drying cartridge facing away from the cover (16) (10) and located and on the side of the mounting flange (18) facing away from the housing cover (16), the lower plate (16) having a landing portion (72) extending from the mounting flange (18), forming a seat (70) for accommodating the o-ring (68) on the facing to the longitudinal axis (12) of the air drying cartridge (10) the side of the landing section (72), and the landing section (72) forms in the radial direction (13r) perpendicular to the longitudinal axis (12) of the air drying cartridge (10) and extends on the side facing away from the housing (14) cartridge at least part side beneath the sealing ring (68) located in the socket (70). 2. The air dryer cartridge according to claim 1, wherein the landing portion (72) of the lower plate (26) extends with its free end (74) under the sealing ring (68) located in the socket (70). 3. The air dryer cartridge according to claim 2, in which the socket (70) for accommodating the sealing ring (68) is made between the bottom plate (26) and the mounting flange (18). 4. The air dryer cartridge according to claim 1, in which the landing section (72) of the lower plate (26) is formed by a section bent on itself. 5. The air dryer cartridge according to claim 4, in which the socket (70) for accommodating the sealing ring (68) is made between the bottom plate (26) and the compressed air preparation device (30). 6. The air dryer cartridge according to claim 4 or 5, wherein the free end (74) of the lower plate (26) at least partially covers a portion of the mounting flange (18). 7. The air dryer cartridge according to any one of paragraphs. 1-6, in which the lower plate (26) contains at least one gear element (29), which is made with the possibility of bringing into engagement with the side of the mounting flange (18) facing from the cover (16) of the housing (14). 8. The air dryer cartridge according to any one of paragraphs. 1-7, in which the landing section (72) of the lower plate (26) is made at least partially curved. 9. The air dryer cartridge according to any one of paragraphs. 1-8, in which the mounting flange (18) on its outer side, facing away from the cover (16) of the cartridge case (14), is made flat at least in the area of the socket (70). 10. The air dryer cartridge according to any one of paragraphs. 1-9, in which the lower plate (26) has a connecting portion (27) for connecting to the cartridge housing (14), the connecting portion (27) extending predominantly in the longitudinal direction (13l) parallel to the longitudinal axis (12) of the air drying cartridge (10) ) from the mounting flange (18). 11. A device (30) for preparing compressed air, in particular for installing a compressed air preparation for a commercial vehicle, comprising a connecting fitting (32) for attaching an air drying cartridge (10) to a device (30) for preparing compressed air, the longitudinal axis of the connecting fitting (32) ) passes mainly coaxially to the longitudinal axis (12) of the air drying cartridge (10), the latter being fixed to the compressed air preparation device, characterized in that the compressed air preparation device (30) with contains a pressure section (75), which is provided in a radial direction perpendicular to the longitudinal axis (12) of the air drying cartridge (10) outside the connecting fitting (32), and the pressure section (75) has a support protrusion (76) extending in the direction of the air drying cartridge, which is located in the radial direction (13r) perpendicular to the longitudinal axis (12) of the air drying cartridge (10) inside the compressed air placed between the preparation device (30) and the air drying cartridge (10) of the sealing ring (68) and t for him in the radial direction (13r) internal emphasis. 12. The device according to claim 11, in which the support protrusion (76) of the pressure section (75) is such that it is mounted in the mounted state of the air drying cartridge in the longitudinal direction (13l) parallel to the longitudinal axis (12) of the air drying cartridge (10) on distance from him. 13. The device according to p. 11 or 12, in which the pressure section (75) has a support edge (82), which extends from the support protrusion (76) in the radial direction (13r) outward, while the support edge (82) in the mounted state the air drying cartridge extends on the side at least partially below the air drying cartridge (10) under the o-ring (68). 14. The device according to claim 13, in which the pressure section (75) has a recess (84) in the radial direction (13r) of the recess (76), offset back relative to the support edge (82). 15. The device according to p. 14, in which the recess (84) of the pressure section (75) is made trapezoidal or wedge-shaped. 16. A compressed air preparation system, in particular for a compressed air preparation installation of a commercial vehicle, comprising a compressed air preparation device (30) according to any one of paragraphs. 11-15, an air drying cartridge (10) according to any one of paragraphs. 1-10 and an o-ring (68) for sealing between the air drying cartridge (10) and the compressed air preparation device (30). 17. The system of claim 16, wherein the o-ring (68) is in the form of an O-ring O-ring.

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