JP3155768U - Hot air heater - Google Patents

Abstract

A hot-air heating device using wood pellets as fuel, which controls combustion according to the temperature in the house and burns wood pellets remaining in the rooster by natural ventilation to prevent fires and incomplete combustion. I will provide a. A conveyor system for supplying wood pellets and an ignition burner are controlled by a temperature detected by a temperature sensor installed in a house. In addition, the uppermost portion of the finned radiating pipes 4a arranged in multiple stages and arranged in parallel in each stage at the upper part of the combustion chamber 3 is connected to the main exhaust pipe 8a with the intake fan 9, The lower stage is connected to the sub exhaust pipe 8b without the intake fan, and the damper 10 selectively closes the sub exhaust pipe 8b when the intake fan 9 is driven, and the main exhaust pipe 8a when it is not driven. When a power failure occurs, the combustion gas bypasses the heat exchanger 4 and communicates with the exhaust pipe, and the wood pellet 5 on the rooster 3c is burned by natural ventilation. [Selection] Figure 2

Description

  The present invention is a simple and unattended operation that uses wood pellets made of solidified pellets of untimbered wood materials such as bark, wood chips, sawn timber, woodworking timber, thinned timber, building waste, etc. The present invention relates to a hot air heater suitable for heating an agricultural house.

Conventionally, a warm air heating device using wood pellets as fuel is known.
For example, Patent Document 1 and Patent Document 2 disclose inventions of hot air heaters using wood pellets as fuel. However, these patent documents do not disclose a technique for keeping the temperature in the house constant when used for heating a house or a technique for dealing with a fan stop due to a power failure.

  In other words, the conventional hot air heating device using wood pellets as fuel is considered to improve the combustion efficiency of the device itself and the treatment of combustion ash, etc., but it is an unmanned operation that is particularly necessary in the heating of agricultural houses. There is still room for improvement in technology to keep the house temperature constant and safety measures in the event of a fan outage during a power failure.

JP 2008-82567 A JP2009-68817A

  The present invention provides a warm air heating device using wood pellets as a fuel, which solves such a conventional problem. Combustion is controlled according to the temperature in the house, and natural ventilation is provided during a power failure. An object of the present invention is to provide a hot air heating apparatus in which wood pellets remaining in the rooster are burned to prevent problems such as fire and incomplete combustion.

The hot air heater of the present invention is
A hot air generating chamber installed in the house with a cold air inlet at the top and a hot air outlet on both sides of the bottom;
A combustion chamber that is disposed approximately in the center of the hot air generating chamber and is equipped with a rooster that holds and burns wood pellets and includes an intake port and a combustion gas exhaust port;
A plurality of finned heat dissipating tubes arranged in a plurality of stages and in parallel with each other on the upper part of the combustion chamber in the hot air generating chamber, and a plurality of connecting ducts connecting the finned heat dissipating tubes to each other. Configured, the lowermost finned radiant pipe is connected to the combustion gas exhaust port of the combustion chamber, and the uppermost finned radiant pipe is connected to an exhaust pipe provided through the hot air generating chamber. With an exchange;
A hopper for storing wood pellets;
A conveyor system for feeding the wood pellets from the hopper onto the rooster;
An ignition burner that ignites wood pellets on the rooster;
An intake fan for sending air to the intake of the combustion chamber;
A hot air fan for blowing air to the cold air inlet of the hot air generating chamber;
Control means for controlling ignition of the conveyor system and the ignition burner according to a temperature detected by a temperature sensor installed in the house;
It is characterized by having.

The exhaust pipe is constituted by an inverted Y-shaped exhaust pipe in which a main exhaust pipe and a sub exhaust pipe are connected to the lower end of the common exhaust pipe, and the uppermost finned heat radiating pipe is connected to the main exhaust pipe. In addition to connecting the finned radiator pipe to the sub exhaust pipe, the main exhaust pipe side is closed at the connection between the main exhaust pipe and the sub exhaust pipe when the exhaust fan is driven and the main exhaust pipe side is closed by its own weight when the exhaust fan is stopped. It is desirable to provide a damper that closes.
By providing an exhaust pipe and a damper with such a structure, even if the exhaust fan stops due to a power failure, the wood pellets remaining on the rooster can be burned by natural ventilation alone, resulting in incomplete combustion and fire. There is no fear.

In addition, the conveyor system also stops at the time of a power failure, so if the wood pellets of Rooster are burned, there will be no burning, the temperature of the combustion chamber will gradually drop, and the hot air heater will be safely returned to the state before ignition. Can do.
The conveyor system is composed of a screw conveyor that conveys wood pellets from the hopper wood pellet outlet to a predetermined position higher than this, and a downwardly inclined fuel supply passage extending from the predetermined position to the rooster in the combustion chamber. Is desirable.
Since the fuel supply path is inclined downward, the wood pellets do not stay in this portion, and even if the screw conveyor stops during a power failure, the wood pellets do not propagate through the wood pellets.

According to the hot air heater of the present invention, the following effects can be achieved.
1. Wood pellets made from bark, wood chips, sawn timber, woodworking timber, thinned timber, construction waste, etc. are used as fuel, so fuel costs are lower than those using oil burners and contribute to environmental conservation. To do.
2. Since combustion is controlled by the temperature in the installed house, the inside of the house can always be maintained at a constant temperature.
3. At the time of a power failure, the damper switches to combustion by natural ventilation, so there is no risk of incomplete combustion of the wood pellets remaining in the rooster due to the stop of the fan or the occurrence of a fire.

It is a top view of one embodiment of the present invention. It is a side view of FIG. 1 which shows a part of this invention in a cross section. It is a front view of FIG. 1 which shows a part of this invention in a cross section. It is a rear view of FIG. 1 which shows a part of this invention in a cross section.

FIG. 1 is a plan view showing an embodiment of a hot air heating device of the present invention, FIG. 2 is a side view thereof partially shown in cross section, FIG. 3 is a front view thereof shown in partial cross section, and FIG. It is a rear view shown by.
The hot air heating device 1 includes a hot air generating chamber 2 installed in a house, a combustion chamber 3 installed in the lower center of the hot air generating chamber 2, and a combustion chamber 3 in the hot air generating chamber 2. The heat exchanger 4, the hopper 6 that stores the wood pellets 5, the conveyor system 7 that transports the wood pellets 5 from the hopper 6 to the combustion chamber 3, and the like constitute the main body.

  A cold air inlet 2a is opened at the upper part of the hot air generating chamber 2, a hot air fan 2b for blowing air toward the opening is installed at the upper part, and hot air outlets 2c are opened at both sides of the lower part. is doing.

  The combustion chamber 3 is entirely formed of a heat-resistant stainless steel plate in a box shape, an intake port 3a is provided at the front, and a combustion gas exhaust port 3b communicating with the heat exchanger 4 is formed at the upper part. Near the intake port 3a, a rooster 3c, which is a slat-like firebed that holds and burns the wood pellet 5, is disposed. Below the rooster 3c, a drawer-type ash box 3d is pulled out to the right in FIG. Arranged to be possible. An ignition oil burner 3f for igniting the wood pellet 5 on the rooster 3c using kerosene or light oil supplied from the oil tank 3e as fuel is disposed in front of the intake port 3a. Reference numeral 3g denotes an intake fan that supplies air for combustion to the ignition oil burner 3f, and 3h denotes a viewing window for viewing the combustion state of the wood pellets.

  The heat exchanger 4 is composed of a plurality of finned heat radiating pipes 4a arranged in multiple stages and in parallel in each stage, and a plurality of connecting ducts 4b connecting the finned heat radiating pipes 4a. Arranged above the combustion chamber 2 in the wind generation chamber 2. The lowermost finned heat radiation pipe 4 a of the heat exchanger 4 communicates with the combustion gas exhaust port 3 b of the combustion chamber 3. Further, the finned heat radiation pipe 4 a at the uppermost stage is connected to a main exhaust pipe 8 a penetrating the side wall of the hot air generation chamber 2 and standing along the hot air generation chamber 2, and sucks combustion gas by the exhaust fan 9. However, exhaust is performed from the main exhaust pipe 8a. As shown in FIG. 3, the finned radiating tube 4a has a large number of square radiating fins 4a2 fixed to the outer periphery of a heat resistant stainless steel square tube 4a1, and is arranged so that the corners are vertically and horizontally. Yes. Further, a sub exhaust pipe 8b having an upper portion connected to a side surface of the main exhaust pipe 8a is provided below the main exhaust pipe 8a, and a lower end thereof is connected to the lowermost finned heat radiating pipe 4a. .

  As shown in FIG. 4, the upper part of the sub exhaust pipe 8b is inclined and connected to the main exhaust pipe 8a, and a damper 10 for selectively closing the main exhaust pipe 8a and the sub exhaust pipe 8b is provided inside the connecting portion. Is provided.

  The damper 10 is hingedly fixed to the lower part in the connection part of both exhaust pipes 8a and 8b, and when the exhaust fan 9 is driven, it is blown up by the wind pressure to open the main exhaust pipe 8a side. In addition, the auxiliary exhaust pipe 8b side is closed. When the fan stops due to a power failure or the like, it turns to close the main exhaust pipe 8a by its own weight to close the main exhaust pipe 8a and open the sub exhaust pipe 8b. For this reason, at the time of a power failure, the combustion gas is exhausted directly from the common exhaust pipe 8c (in the figure, an extended portion of the main exhaust pipe 8a) via the sub exhaust pipe 8b without passing through the heat exchanger 4, and the wood pellets are burned. Air is secured by natural ventilation.

  The conveyor system 7 includes a screw conveyor 7a disposed obliquely upward from the dropping port of the wood pellet 5 of the hopper 6 toward the hot air generating chamber 2, the motor 7b for rotating the screw of the screw conveyor 7a, and the screw conveyor 7a. It is comprised from the pellet conveyance pipe 7c arrange | positioned from the discharge port directly above the rooster 3c of the combustion chamber 3 by the downward gradient.

Reference numeral T1 is an in-furnace temperature sensor, T2 is an exhaust temperature sensor, and T3 is a hot air temperature sensor. Although not shown, an in-house temperature sensor is also installed in the center of the house. With these temperature sensors and timers, the supply and ignition timing of the wood pellets is controlled based on a preset program, and the interior of the house is maintained at a constant temperature. Measures are automatically taken to avoid the occurrence of
Although illustration is omitted, room temperature setting, temperature monitoring, operation start, stop, automatic, manual switching, monitoring and the like are performed by a control panel provided with a touch panel.

Next, an operation (control) method of the hot air heating apparatus of the present invention will be described.
(Control by furnace temperature and timer)
First, necessary temperature data and the like are set on a control panel (not shown) via a touch sensor. A suitable exhaust discharge temperature is 80 ° C to 100 ° C, and a hot air blowing temperature is 50 ° C to 70 ° C.
Next, the screw conveyor 7a is driven, and the wood pellet 5 is thrown from the hopper 6 onto the rooster 3c of the combustion chamber 3. After driving the screw conveyor 7a for 3 minutes, the screw conveyor 7a is stopped.
Next, the exhaust fan 9 is driven and the ignition burner 3f ignites the wood pellet 5 on the rooster. When the wood pellet 5 is ignited, the ignition burner 3f stops and the intake fan 9 starts operation.
The in-furnace temperature sensor T1 continuously or intermittently detects the in-furnace temperature, and when the rise in the in-furnace temperature stops, the screw conveyor 7a is driven again to supply the wood pellet 5 onto the rooster 3c in the combustion chamber 3.
When this operation is repeated and the furnace temperature rises to 800 ° C., the screw conveyor 7a stops.
When the furnace temperature falls to 750 ° C., the screw conveyor 7a is driven again, and the wood pellets are supplied to the rooster 3c.

  These operations are automatically performed according to a preset program by the output of the furnace temperature sensor and the timer.

(Control by house temperature)
Connect the temperature sensor in the house installed in the center of the house to the control panel of the hot air heater with a cable cord, and set the maximum and minimum temperature in the house on the touch panel of the control panel.
When the house temperature reaches the maximum temperature according to a preset program, the hot air blower stops, and when it reaches the minimum temperature, the operation is started so that the inside of the house is maintained in a predetermined temperature range.
In addition, it is also possible to appropriately change or disperse the hot air outlet using a flexible duct so that the temperature in the house does not increase depending on the location.

  DESCRIPTION OF SYMBOLS 1 ... Warm air heating device, 2 ... Warm air production | generation room, 2a ... Cold air introduction port, 2b ... Warm air fan, 2c ... Hot air blowing port, 3 ... Combustion chamber, 3a ... Air intake port, 3b ... Combustion gas exhaust port, 3c ... Lostol, 3d ... Ash box, 3e ... Oil tank, 3f ... Ignition oil burner, 3g ... Intake fan, 3h ... Viewing window, 4 ... Heat exchanger 4a ... radial pipe with fins, 4b ... connecting duct, 5 ... wood pellets 5, 6 ... hopper, 7 ... conveyor system, 7a ... screw conveyor, 7b ... motor, 7c ... pellet conveying pipe 8a: main exhaust pipe, 8b: auxiliary exhaust pipe, 8c: common exhaust pipe, 9: exhaust fan, 10: damper.

Claims (4)

A hot air generating chamber installed in the house with a cold air inlet at the top and a hot air outlet on both sides of the bottom;
A combustion chamber that is disposed approximately in the center of the hot air generating chamber and is equipped with a rooster that holds and burns wood pellets and includes an intake port and a combustion gas exhaust port;
A plurality of finned heat dissipating tubes arranged in a plurality of stages and in parallel with each other on the upper part of the combustion chamber in the hot air generating chamber, and a plurality of connecting ducts connecting the finned heat dissipating tubes to each other. Configured, the lowermost finned radiant pipe is connected to the combustion gas exhaust port of the combustion chamber, and the uppermost finned radiant pipe is connected to an exhaust pipe provided through the hot air generating chamber. With an exchange;
A hopper for storing wood pellets;
A conveyor system for feeding the wood pellets from the hopper onto the rooster;
An ignition burner that ignites wood pellets on the rooster;
An intake fan for sending air to the intake of the combustion chamber;
A hot air fan for blowing air to the cold air inlet of the hot air generating chamber;
Control means for controlling ignition of the conveyor system and the ignition burner according to a temperature detected by a temperature sensor installed in the house;
A warm air heating device characterized by comprising:   The hot air heater according to claim 1, wherein an exhaust fan is provided in the main exhaust pipe.   The exhaust pipe is composed of an inverted Y-shaped exhaust pipe in which a main exhaust pipe and a sub exhaust pipe are connected to the lower end of the common exhaust pipe, and the uppermost finned heat radiating pipe is connected to the main exhaust pipe, The finned radiator pipe is connected to the sub exhaust pipe, and the connection between the main exhaust pipe and the sub exhaust pipe closes the sub exhaust pipe side by wind pressure from the exhaust fan, and when the exhaust fan stops, the main exhaust pipe side is closed by its own weight. The hot air heating apparatus according to claim 1 or 2, wherein a damper is provided for closing.   The conveyor system includes a screw conveyor that conveys the wood pellets from a hopper wood pellet outlet to a predetermined position higher than the hopper wood pellet outlet, and a downwardly inclined fuel supply passage that extends from the predetermined position to the rooster in the combustion chamber. The warm air heating device according to any one of claims 1 to 3.

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