CN220119155U - Nitrogen supply system - Google Patents

Abstract

The utility model relates to a nitrogen supply system, which comprises a liquid nitrogen storage tank, a liquid nitrogen gasifier and a heat pump system, wherein the liquid nitrogen gasifier comprises a tank body, a heat exchange medium is filled in the tank body, a heat exchange pipe is arranged in the tank body, one end of the heat exchange pipe is connected with a liquid outlet of the liquid nitrogen storage tank through a pipeline, the other end of the heat exchange pipe is connected with an air outlet pipe of which one end extends out of the tank body, the heat pump system comprises a first expansion valve, an evaporator, a first compressor and a first condenser which are sequentially connected through pipelines to form a circulation loop, the first condenser is arranged at the bottom of an inner cavity of the tank body, and a refrigerant in the evaporator is suitable for exchanging heat with indoor air; the novel nitrogen supply system has the characteristics of high energy utilization rate, energy conservation and environmental protection.

Description

A nitrogen supply system

Technical field

The utility model relates to the technical field of gas supply systems, in particular to a nitrogen supply system.

Background technique

The nitrogen supply system of the prior art includes a liquid nitrogen storage tank, which is connected to a liquid nitrogen vaporizer through a pipeline. The liquid nitrogen vaporizer is an air bath type vaporizer, and the air bath type liquid nitrogen vaporizer is It uses the flow of air to automatically heat and does not require any other energy. It has the characteristics of low maintenance cost and environmental protection. The disadvantage is that it does not fully utilize the cold energy released when liquid nitrogen vaporizes, and the energy utilization rate is low.

Utility model content

The technical problem to be solved by the utility model is to provide a nitrogen supply system, which has high energy utilization rate and is energy-saving and environmentally friendly.

In order to solve the above technical problems, the nitrogen supply system provided by the utility model includes a liquid nitrogen storage tank, a liquid nitrogen vaporizer and a heat pump system. The liquid nitrogen vaporizer includes a tank, and the tank is filled with a heat exchange medium. A heat exchange tube is provided in the tank, one end of the heat exchange tube is connected to the liquid outlet of the liquid nitrogen storage tank through a pipeline, and the other end of the heat exchange tube is connected to an air outlet pipe with one end extending out of the tank body. The heat pump system includes a first expansion valve, an evaporator, a first compressor and a first condenser that are connected in sequence through pipelines to form a circulation loop. The first condenser is arranged at the bottom of the inner cavity of the tank. Refrigerant is suitable for exchanging heat with indoor air.

It is further preferred that both the heat exchange tube and the first condenser are serpentine tubes, and the serpentine tubes are provided with multiple heat dissipation fins; the serpentine tubes with fins have good heat exchange effect.

Further preferably, it also includes a subcooling system. The subcooling system includes a second expansion valve, a second compressor and a second condenser connected in sequence through pipelines to form a circulation loop. The cold medium pipeline of a subcooler is connected in series. On the pipeline between the second expansion valve and the second compressor, the heat medium pipeline of the subcooler is connected in series on the pipeline between the first expansion valve and the first condenser; a subcooling system is provided to make the heat pump system The cycle performance coefficient is improved.

It is further preferred that the end of the gas outlet pipe away from the heat exchange pipe is connected to the nitrogen buffer tank, and an air separation nitrogen making device is connected to the gas outlet pipe through the pipeline and the shut-off valve provided on the pipeline; when there is a problem with the nitrogen supply system When nitrogen cannot be supplied normally, emergency nitrogen supply can be provided through an air separation nitrogen generator.

It is further preferred that the gas outlet of the nitrogen buffer tank is connected to a pressure stabilizer, a water-gas separator, and a dryer in sequence through pipelines; the nitrogen supply system can supply constant-pressure, pure, and dry nitrogen to the pipe network.

Further preferably, branch pipelines are respectively provided on the pipeline between the liquid outlet of the liquid nitrogen storage tank and the heat exchange tube and on the gas outlet pipe, and a safety valve is connected to the outer end of the branch pipeline; the safety valve is critical to the system. The pipeline functions as overpressure protection.

Beneficial effects of the utility model: when the heat pump system is working, the low-temperature and low-pressure mist refrigerant flows through the evaporator, absorbs the heat of the indoor air and vaporizes, and then performs work in the first compressor to form a high-temperature and high-pressure gaseous refrigerant. The gaseous refrigerant flows through the first condenser and transfers heat to the heat exchange medium in the tank to form a medium temperature and high pressure liquid refrigerant. The liquid refrigerant flows through the first expansion valve and returns to a low temperature and low pressure mist refrigerant, so Forming a cycle; the heat exchange medium in the tank is heated by the heat pump system, the high-temperature heat exchange medium flows upward, the low-temperature heat exchange medium flows downward, and the heat exchange medium in the tank forms a self-circulation, so the exchange rate of the liquid nitrogen vaporizer It has high thermal efficiency and is environmentally friendly and energy-saving; the heat pump system is used to provide indoor cooling, making full use of the cold energy released when liquid nitrogen is vaporized, and has a high energy utilization rate; this new type of nitrogen supply system has a high energy utilization rate and has Energy saving and environmental protection characteristics.

Description of the drawings

In order to clearly illustrate the innovative principle of the utility model and its advantages compared with existing nitrogen supply systems, possible embodiments are explained below by means of non-limiting examples of the application of the principles with the aid of the accompanying drawings. In the picture:

Figure 1 is a schematic diagram of the nitrogen supply system of the present invention;

Figure 2 is a schematic diagram of the liquid nitrogen vaporizer.

Implementation

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them.

Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a specific posture (as shown in the drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In this model, unless otherwise expressly stipulated and limited, the terms "connection" and "fixing" should be understood in a broad sense. For example, "fixing" can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interactive relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Example

As shown in Figure 1-2, the nitrogen supply system of this embodiment includes a liquid nitrogen storage tank 1, a liquid nitrogen vaporizer 2 and a heat pump system. The liquid nitrogen vaporizer 2 includes a tank 3, and the tank 3 is filled with Heat exchange medium, the tank 3 is provided with a heat exchange tube 4, one end of the heat exchange tube 4 is connected to the liquid outlet of the liquid nitrogen storage tank 1 through a pipeline, and the other end of the heat exchange tube 4 is connected to One end extends out of the air outlet pipe 5 outside the tank 3. The heat pump system includes a first expansion valve 6, an evaporator 7, a first compressor 8 and a first condenser 9 that are connected in sequence through pipelines to form a circulation loop. The first condenser 9 is arranged at the bottom of the inner cavity of the tank 3, and the refrigerant in the evaporator 7 is suitable for heat exchange with indoor air.

Preferably, the heat exchange medium in the tank 3 is water; the heat exchange medium in the tank 3 can also be oil.

Preferably, the heat pump system uses carbon dioxide as the refrigerant. Carbon dioxide refrigerant is more environmentally friendly and will not destroy the ozone layer.

Preferably, the heat exchange tube 4 and the first condenser 9 are both serpentine tubes, and the serpentine tubes are provided with multiple heat dissipation fins; the serpentine tubes with fins have good heat exchange effects; The heat pipe 4 and the first condenser 9 can also be spiral tubes or parallel tube bundles.

Preferably, it also includes a subcooling system, which includes a second expansion valve 10, a second compressor 11, a second condenser 12, and a cooling medium of a subcooler 13 connected in sequence through pipelines to form a circulation loop. The pipeline 14 is connected in series on the pipeline between the second expansion valve 10 and the second compressor 11 , and the heat medium pipeline 15 of the subcooler 13 is connected in series on the pipeline between the first expansion valve 6 and the first condenser 9 ; Set up a subcooling system to improve the circulation performance coefficient of the heat pump system.

Preferably, one end of the gas outlet pipe 5 away from the heat exchange tube 4 is connected to the nitrogen buffer tank 16, and an air separation nitrogen making device 17 is connected to the gas outlet pipe 5 through the pipeline and the shut-off valve 18 provided on the pipeline; when When a problem occurs in the nitrogen supply system and cannot supply nitrogen normally, emergency nitrogen supply can be provided through an air separation nitrogen generator.

Preferably, the outlet of the nitrogen buffer tank 16 is connected to the pressure stabilizer 19, the water gas separator 20, and the dryer 21 in sequence through pipelines; the nitrogen supply system can supply constant pressure, pure and dry nitrogen to the pipe network. .

Preferably, branch pipelines are respectively provided on the pipeline between the liquid outlet of the liquid nitrogen storage tank 1 and the heat exchange tube 4 and on the gas outlet pipe 5, and the outer end of the branch pipeline is connected to a safety valve 22; safety valve 22 is connected to the outer end of the branch pipeline. Valve 22 plays an over-pressure protection function for the system pipeline.

When the heat pump system is working, the low-temperature and low-pressure mist refrigerant flows through the evaporator 7, absorbs the heat of the indoor air and vaporizes, and then performs work in the first compressor 8 to form a high-temperature and high-pressure gaseous refrigerant. The gaseous refrigerant flows through The first condenser 9 transfers heat to the heat exchange medium in the tank 3 to form a medium temperature and high pressure liquid refrigerant. The liquid refrigerant flows through the first expansion valve 6 and is restored to a low temperature and low pressure mist refrigerant. This configuration One cycle; the heat exchange medium in tank 3 is heated by the heat pump system, the high-temperature heat exchange medium in tank 3 flows upward, the low-temperature heat exchange medium flows downward, and the heat exchange medium in tank 3 forms a self-circulation , therefore the heat exchange efficiency of the liquid nitrogen vaporizer 2 is high, and it is environmentally friendly and energy-saving; the heat pump system is used to provide indoor cooling, making full use of the cooling capacity released when the liquid nitrogen is vaporized, and the energy utilization rate is high; in this embodiment The nitrogen supply system has high energy utilization rate and is energy-saving and environmentally friendly.

The above is the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and modifications can be made without departing from the principles described in the present utility model. These improvements and modifications It should also be regarded as the protection scope of the present utility model.

Claims (6)

1. A nitrogen supply system, characterized in that it includes a liquid nitrogen storage tank (1), a liquid nitrogen vaporizer (2) and a heat pump system. The liquid nitrogen vaporizer (2) includes a tank (3), and the The tank (3) is filled with heat exchange medium, and a heat exchange tube (4) is provided in the tank (3). One end of the heat exchange tube (4) is connected to the liquid nitrogen storage tank (1) through a pipeline. The other end of the heat exchange pipe (4) is connected to an air outlet pipe (5) with one end extending out of the tank (3). The heat pump system includes a first pipe connected in sequence to form a circulation loop. Expansion valve (6), evaporator (7), first compressor (8) and first condenser (9). The first condenser (9) is arranged at the bottom of the inner cavity of the tank (3), so The refrigerant in the evaporator (7) is suitable for heat exchange with indoor air. 2. The nitrogen supply system according to claim 1, characterized in that: the heat exchange tube (4) and the first condenser (9) are both serpentine tubes, and the serpentine tube is provided with multiple heat sinks. fins. 3. The nitrogen supply system according to claim 1, characterized in that: it also includes a subcooling system, the subcooling system includes a second expansion valve (10) connected in sequence through pipelines to form a circulation loop, a second compressor (11) and the second condenser (12), the cold medium pipe (14) of a subcooler (13) is connected in series on the pipeline between the second expansion valve (10) and the second compressor (11), so The heat medium pipe (15) of the subcooler (13) is connected in series on the pipeline between the first expansion valve (6) and the first condenser (9). 4. The nitrogen supply system according to claim 1, characterized in that: one end of the gas outlet pipe (5) away from the heat exchange pipe (4) is connected to a nitrogen buffer tank (16), and an air separation nitrogen making device (17) It is connected to the air outlet pipe (5) through a pipeline and a shut-off valve (18) provided on the pipeline. 5. The nitrogen supply system according to claim 4, characterized in that: the outlet of the nitrogen buffer tank (16) is connected to the pressure stabilizer (19), the water and gas separator (20), and the dryer in sequence through pipelines. Connector (21). 6. The nitrogen supply system according to claim 5, characterized in that: the pipeline between the liquid outlet of the liquid nitrogen storage tank (1) and the heat exchange pipe (4) and the gas outlet pipe (5) are respectively A branch pipeline is provided, and a safety valve (22) is connected to the outer end of the branch pipeline.