Refrigeration and cold storage system for refrigerated vehicles

Abstract

The refrigeration cold storage system for refrigerated vehicles relates to a refrigeration cold storage system for refrigerated vehicles. It is mainly designed to solve the problem of high refrigeration cost of existing refrigerated vehicles. It includes several cold storage tanks, the coils of which are respectively connected with LNG inlet and outlet pipes, Freon inlet and outlet pipes, and refrigerant inlet and outlet pipes, the LNG inlet pipe is connected with the LNG cylinder, and the LNG discharge pipe is connected with the engine. The Freon storage tank is connected with the Freon pipeline A, the Freon inlet pipe is connected with the Freon pipeline A, the Freon discharge pipe is connected with the Freon pipeline B, and the Freon pipeline B is connected with the Freon storage tank through a condenser, a filter, and a compressor. The refrigerant inlet pipe is connected with the refrigerant pipeline A, and the refrigerant pipeline A is connected with the outlet of the first independent refrigeration evaporator through a filter; the refrigerant discharge pipe is connected with the refrigerant pipeline B, and the refrigerant pipeline B is connected with the inlet of the first independent refrigeration evaporator through an expansion pot. The advantage is low refrigeration cost.

Description

Technical Field:

[0002] The present invention relates to a refrigeration and cold storage system for refrigerated trucks. Background Art:

[0004] With the rapid development of the natural gas industry, the use of liquefied natural gas as an automotive fuel has developed rapidly. LNG is obtained by cryogenic processing and liquefaction of gaseous natural gas and is a super-low temperature energy-carrying liquid. It must be gasified and used in gaseous form. Since the temperature of LNG is -162°C, a large amount of cold energy is generated during the gasification process. If not recovered, it will cause great energy waste.

[0005] Most existing refrigerated trucks generate electricity with oil and use electric drive compressors for refrigeration without a cold storage function. After the temperature in the refrigerated compartment reaches the set temperature, the compressor has to stop for five minutes every five minutes of operation, while the generator has to keep generating electricity, resulting in high refrigeration costs and energy waste. Summary of the Invention:

[0007] The technical problem to be solved by the present invention is to provide a refrigeration and cold storage system for refrigerated trucks that can reduce the refrigeration cost of refrigerated trucks, save energy, achieve stable cold release, and have a high cold utilization rate.

[0008] The above object is achieved as follows: It includes several cold storage pools, each of which includes a housing. Inside the housing, there are three first coiled pipes. The inlet ends of the three first coiled pipes are respectively connected to an LNG inlet pipe, a refrigerant inlet pipe, and a coolant inlet pipe. The outlet ends of the three first coiled pipes are respectively connected to an LNG discharge pipe, a refrigerant discharge pipe, and a coolant discharge pipe. The housing of the cold storage pool stores a cold storage agent. Valves are installed on the LNG inlet pipe, the refrigerant inlet pipe, the coolant inlet pipe, the LNG discharge pipe, the refrigerant discharge pipe, and the coolant discharge pipe.

[0009] It also includes an LNG gas cylinder. The LNG inlet pipes of several cold storage pools are all connected to the outlet of the LNG gas cylinder, and the LNG discharge pipes of several cold storage pools are connected to the vehicle engine.

[0010] It also includes a refrigerant circulation pipeline, which includes a refrigerant storage tank filled with refrigerant. The outlet of the refrigerant storage tank is connected to a refrigerant pipeline A, and a throttle valve is installed on the refrigerant pipeline A. The refrigerant inlet pipes of several cold storage pools are all connected to the refrigerant pipeline A behind the throttle valve. The refrigerant discharge pipes of the cold storage pools are all connected to a refrigerant pipeline B. The refrigerant pipeline B is connected to the inlet of the condenser. The outlet of the condenser is connected to the inlet of the first filter through a pipeline. The outlet of the first filter is connected to a compressor through a pipeline, and the compressor is connected to the refrigerant storage tank through a pipeline.

[0011] It also includes two independent refrigeration evaporators with the same structure, namely the first independent refrigeration evaporator and the second independent refrigeration evaporator. The independent refrigeration evaporator includes a housing, a coil is provided inside the housing, a fan is provided in front of the coil, and there is an air outlet at the housing behind the coil.

[0012] It also includes a secondary refrigerant circulation pipeline. The secondary refrigerant inlet pipes on several cold storage pools are all connected to the secondary refrigerant pipeline A. The other end of the secondary refrigerant pipeline A is connected to the outlet of the second filter. The inlet of the second filter is connected to the outlet of the circulation pump through a pipeline, and the inlet of the circulation pump is connected to the outlet end of the coil of the first independent refrigeration evaporator through a pipeline and a valve; the secondary refrigerant discharge pipes on several cold storage pools are all connected to the secondary refrigerant pipeline B. The other end of the secondary refrigerant pipeline B is connected to an expansion tank. The expansion tank is connected to the inlet end of the coil of the first independent refrigeration evaporator through a pipeline and a valve. The above pipelines form a secondary refrigerant circulation pipeline, and a secondary refrigerant is filled in these pipelines.

[0013] A pipeline A is connected to the inlet end of the coil of the second independent refrigeration evaporator. The other end of the pipeline A is connected to the secondary refrigerant pipeline A behind the throttle valve. A pipeline B is connected to the outlet end of the coil of the second independent refrigeration evaporator. The other end of the pipeline B is connected to the secondary refrigerant pipeline B behind the condenser. Valves are installed on both the pipeline A and the pipeline B.

[0014] For two adjacent cold storage pools, a connecting pipeline A is connected between the LNG discharge pipe on the cold storage pool at the rear side and the LNG inlet pipe of the cold storage pool in front of it. A connecting pipeline A is connected between the LNG discharge pipe on the cold storage pool at the forefront and the LNG inlet pipe of the cold storage pool at the rearmost side.

[0015] A connecting pipeline B is connected between the secondary refrigerant discharge pipe on the cold storage pool at the rear side and the secondary refrigerant inlet pipe of the cold storage pool in front of it. A connecting pipeline B is connected between the secondary refrigerant discharge pipe on the cold storage pool at the forefront and the secondary refrigerant inlet pipe of the cold storage pool at the rearmost side.

[0016] Since the LNG in the LNG cylinder enters the vehicle engine after passing through the cold storage pool, and there is a secondary refrigerant in the cold storage pool, a large amount of cold energy generated during its liquefaction process is stored in the cold storage pool. Setting multiple cold storage pools enables one cold storage pool to store cold and then store cold for the next cold storage pool, realizing sequential cold storage and sequential cold release of multiple cold storage pools, achieving the purpose of uniformly releasing cold energy. When the LNG cannot meet the cold storage requirements, the secondary refrigerant can be used for cold storage. The secondary refrigerant absorbs the cold energy in the cold storage pool and releases cold to the compartment of the refrigerated truck during the circulation process.

[0017] After the LNG and the secondary refrigerant store cold in one cold storage pool, the cold energy that has not been released completely can also enter a cold storage pool in front of it through the connecting pipeline A or the connecting pipeline B to continue storing cold for this cold storage pool, improving the utilization rate of cold energy.

[0018] The advantages of the present invention are as follows: The system is installed in the refrigerated compartment of a refrigerated truck. When the vehicle starts, Freon is controlled by a valve to pass through the first independent refrigeration evaporator to cool the compartment of the refrigerated truck. After the refrigerated truck has traveled for a period of time and the cold energy storage pool has stored cold energy, the cold carrier is circulated to supply cold to the refrigerated compartment, and the supply of Freon is stopped. In this way, a large amount of cold energy generated during the gasification process of LNG can be recovered and utilized, thereby reducing the refrigeration cost of the refrigerated truck, saving energy, having a cold energy storage function to achieve stable cold release, and having a high cold energy utilization rate. Description of the Drawings:

[0020] Figure 1 It is a schematic structural diagram of the present invention. Specific Embodiment:

[0022] The following will further describe the present invention in conjunction with Figure 1 ;

[0023] It includes several cold energy storage pools 1. Each cold energy storage pool includes a housing. Inside the housing, there are three first coiled pipes 2. The inlet ends of the three first coiled pipes are respectively connected to an LNG inlet pipe 3, a Freon inlet pipe 4, and a cold carrier inlet pipe 5. The outlet ends of the three first coiled pipes are respectively connected to an LNG discharge pipe 6, a Freon discharge pipe 7, and a cold carrier discharge pipe 8. The housing of the cold energy storage pool stores a cold storage agent. Valves are installed on the LNG inlet pipe, Freon inlet pipe, cold carrier inlet pipe, LNG discharge pipe, Freon discharge pipe, and cold carrier discharge pipe.

[0024] It further includes an LNG gas cylinder 9. The LNG inlet pipes of several cold energy storage pools are all connected to the outlet of the LNG gas cylinder, and the LNG discharge pipes of several cold energy storage pools are connected to the vehicle engine 10.

[0025] It further includes a Freon circulation pipeline. This pipeline includes a Freon storage tank 11. The Freon storage tank is filled with Freon. The outlet of the Freon storage tank is connected to a Freon pipeline A 12. A throttle valve 13 is installed on the Freon pipeline A. The Freon inlet pipes on several cold energy storage pools are all connected to the Freon pipeline A behind the throttle valve. The Freon discharge pipes on the cold energy storage pools are all connected to a Freon pipeline B 14. The Freon pipeline B is connected to the inlet of a condenser 15. The outlet of the condenser is connected to the inlet of a first filter 16 through a pipeline. The outlet of the first filter is connected to a compressor 17 through a pipeline. The compressor is connected to the Freon storage tank 11 through a pipeline.

[0026] It further includes two independent refrigeration evaporators with the same structure, namely a first independent refrigeration evaporator 18 and a second independent refrigeration evaporator 19. The independent refrigeration evaporator includes a housing 18-1. Inside the housing, there is a coiled pipe 18-2. In front of the coiled pipe, there is a blower 18-3. There is an air outlet at the housing behind the coiled pipe.

[0027] It also includes a secondary refrigerant circulation pipeline. The secondary refrigerant inlet pipes on several cold storage pools are all connected to the secondary refrigerant pipeline A20. The other end of the secondary refrigerant pipeline A is connected to the outlet of the second filter 21. The inlet of the second filter is connected to the outlet of the circulation pump 22 through a pipeline. The inlet of the circulation pump is connected to the coil outlet end of the first independent refrigeration evaporator 18 through a pipeline and a valve. The secondary refrigerant discharge pipes on several cold storage pools are all connected to the secondary refrigerant pipeline B26. The other end of the secondary refrigerant pipeline B is connected to the expansion tank 23. The expansion tank is connected to the coil inlet end of the first independent refrigeration evaporator through a pipeline and a valve. The above pipelines form a secondary refrigerant circulation pipeline, and a secondary refrigerant is filled in these pipelines.

[0028] The coil inlet end of the second independent refrigeration evaporator 19 is connected to a pipeline A24. The other end of the pipeline A is connected to the Freon pipeline A behind the throttle valve 13. The coil outlet end of the second independent refrigeration evaporator is connected to a pipeline B25. The other end of the pipeline B is connected to the Freon pipeline B behind the condenser. Valves are installed on both the pipeline A and the pipeline B.

[0029] For two adjacent cold storage pools, a communication pipeline A28 is connected between the LNG discharge pipe on the rear cold storage pool and the LNG inlet pipe on the front cold storage pool. A communication pipeline A is connected between the LNG discharge pipe on the frontmost cold storage pool and the LNG inlet pipe on the rearmost cold storage pool.

[0030] A communication pipeline B27 is connected between the Freon discharge pipe on the rear cold storage pool and the Freon inlet pipe on the front cold storage pool. A communication pipeline B is connected between the Freon discharge pipe on the frontmost cold storage pool and the Freon inlet pipe on the rearmost cold storage pool.

[0031] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A refrigeration cold storage system for a refrigerated vehicle, comprising a plurality of cold storage tanks (1), characterized in that: The cold storage tank comprises a shell, in which three first coils (2) are arranged, the inlet ends of the three first coils are respectively connected to an LNG inlet pipe (3), a Freon inlet pipe (4), and a coolant inlet pipe (5), the outlet ends of the three first coils are respectively connected to an LNG discharge pipe (6), a Freon discharge pipe (7), and a coolant discharge pipe (8), and coolant is stored in the shell of the cold storage tank; valves are installed on the LNG inlet pipe, the Freon inlet pipe, the coolant inlet pipe, the LNG discharge pipe, the Freon discharge pipe, and the coolant discharge pipe; It also includes an LNG cylinder (9), wherein the LNG inlet pipes of the plurality of cold storage tanks are connected to the outlet of the LNG cylinder, and the LNG discharge pipes of the plurality of cold storage tanks are connected to the automobile engine; It also includes a Freon circulation pipeline, which includes a Freon storage tank (11), the Freon storage tank contains Freon, the outlet of the Freon storage tank is connected to a Freon pipeline A (12), a throttle valve (13) is installed on the Freon pipeline A, the Freon inlet pipes on a plurality of cold storage tanks are connected to the Freon pipeline A behind the throttle valve, the Freon discharge pipes on the cold storage tanks are connected to the Freon pipeline B (14), the Freon pipeline B is connected to the inlet of the condenser (15), the outlet of the condenser is connected to the inlet of the first filter (16) through a pipeline, the outlet of the first filter is connected to the compressor (17) through a pipeline, and the compressor is connected to the Freon storage tank (11) through a pipeline; It also includes a refrigerant circulation pipeline, wherein the refrigerant inlet pipes on the plurality of cold storage tanks are connected to the refrigerant pipeline A (20), the other end of the refrigerant pipeline A is connected to the outlet of the second filter (21), the inlet of the second filter is connected to the outlet of the circulation pump (22) through a pipeline, and the inlet of the circulation pump is connected to the coil outlet end of the first independent refrigeration evaporator (18) through a pipeline and a valve; the refrigerant discharge pipes on the plurality of cold storage tanks are connected to the refrigerant pipeline B (26), the other end of the refrigerant pipeline B is connected to the expansion pot (23), and the expansion pot is connected to the coil inlet end of the first independent refrigeration evaporator through a pipeline and a valve. The above pipelines constitute a refrigerant circulation pipeline, and the pipelines are filled with refrigerant.

2. The refrigeration and cold storage system for a refrigerated vehicle according to claim 1, characterized in that: The coil inlet end of the second independent refrigeration evaporator (19) is connected to a pipe A (24), the other end of which is connected to a Freon pipe A behind the throttle valve (13); the coil outlet end of the second independent refrigeration evaporator is connected to a pipe B (25), the other end of which is connected to a Freon pipe B behind the condenser; valves are installed on both pipe A and pipe B.

3. The refrigeration and cold storage system for a refrigerated vehicle according to claim 1 or 2, characterized in that: A connecting pipeline A (28) is connected between the LNG discharge pipe on the cold storage tank located at the rear side and the LNG inlet pipe of the cold storage tank located in front of it, and a connecting pipeline A is connected between the LNG discharge pipe on the cold storage tank located at the frontmost side and the LNG inlet pipe of the cold storage tank located at the rearmost side.

4. The refrigeration and cold storage system for a refrigerated vehicle according to claim 1 or 2, characterized in that: A connecting pipeline B (27) is connected between the Freon discharge pipe on the cold storage tank located at the rear side and the Freon inlet pipe on the cold storage tank located in front thereof, and a connecting pipeline B is connected between the Freon discharge pipe on the cold storage tank located at the frontmost side and the Freon inlet pipe of the cold storage tank located at the rearmost side.

5. The refrigeration and cold storage system for a refrigerated vehicle according to claim 3, characterized in that: A connecting pipeline B (27) is connected between the Freon discharge pipe on the cold storage tank located at the rear side and the Freon inlet pipe on the cold storage tank located in front thereof, and a connecting pipeline B is connected between the Freon discharge pipe on the cold storage tank located at the frontmost side and the Freon inlet pipe of the cold storage tank located at the rearmost side.

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