Combined high-efficiency heat exchanger for cold energy air conditioning

Abstract

The application discloses a combined high-efficiency heat exchanger for cold energy air conditioning, which comprises an outer storage tank, a first heat exchanger, a second heat exchanger, a third heat exchanger, a communication pipeline and a fixing support; the outer storage tank is used for storing a cold storage agent; the first heat exchanger comprises an LNG collector, a plurality of parallel flat tubes, heat exchange fins and an NG collector; the second heat exchanger comprises an NG heat exchange channel and a cold carrier heat exchange channel; the third heat exchanger comprises a cold carrier inlet and outlet collector, a plurality of parallel flat tubes, heat exchange fins and a cold carrier intermediate collector; the cold storage agent comprises cold storage agent evaporation gas in a gaseous state and liquid-phase cold storage agent in a liquid state. The cold storage agent is used as an intermediate heat exchange medium, and three heat exchangers are combined to realize the purpose of heat exchange between two of the three kinds of medium, so that the problems of cold carrier icing and poor heat exchange during high-temperature difference heat exchange can be solved; meanwhile, the structure has the advantages of large heat transfer area, high heat transfer coefficient, compact layout, convenient small-size design and manufacturing, and can also meet the cold storage function of the cold energy air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cold energy air conditioning refrigeration technology, and particularly relates to a combined high-efficiency heat exchanger for cold energy air conditioning. BACKGROUND

[0002] With the in-depth transformation of China's energy consumption structure, natural gas is becoming one of the main alternative energy sources for vehicle fuel due to its environmental protection, energy saving and economy, and especially LNG (liquefied natural gas) is gradually used by commercial vehicles due to its safety, cleanliness, high loadable rate and low use cost, which not only promotes the transformation of China's energy structure, but also effectively reduces environmental pollution caused by burning exhaust emissions.

[0003] LNG as a vehicle fuel is a liquid form of natural gas, which is stored in a low-temperature cylinder with a temperature of-162 DEG C and a pressure of 0.1 MPa. LNG is beneficial to storage and transportation, but the state when it is finally utilized is often gaseous. Therefore, LNG needs to be vaporized before being utilized. When the automobile gas system uses LNG fuel, a large amount of cold energy is released during the vaporization of LNG, that is, a large amount of available cold energy is released during the LNG vaporization process, which causes waste of cold energy. Recycling this part of cold energy can effectively utilize energy.

[0004] At present, some experts and scholars in colleges and universities and research institutes propose an automobile air conditioning refrigeration system based on LNG cold energy recovery, but the heat exchangers of these refrigeration systems all adopt a method of direct heat exchange between a cold carrier and LNG. Since there is a large heat exchange temperature difference between the two, the LNG air conditioning refrigeration system is prone to problems of ice blocking of the cold carrier and poor heat exchange, which causes the system to be unable to continuously and stably operate, and the cold energy recovery and utilization efficiency is low. SUMMARY

[0005] The present application aims to solve the problems of ice blocking of a cold carrier and low heat exchange efficiency of a cold energy air conditioning refrigeration system in the prior art, and proposes a combined high-efficiency heat exchanger for cold energy air conditioning.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] A combined high-efficiency heat exchanger for cold energy air conditioning, comprising an outer storage tank, a first heat exchanger, a second heat exchanger, a third heat exchanger, a communication pipeline and a fixing support.

[0008] The outer storage tank is used for storing the cold storage agent, the cold storage agent has gas-liquid conversion characteristics and its freezing point temperature is lower than the temperature of LNG, the cold storage agent inside the outer storage tank presents two states of coexistence of gaseous cold storage agent evaporation gas and liquid phase cold storage agent, the cylindrical side wall of the outer storage tank forms an outer cylinder, the left end cover and the right end cover are welded at two ends of the outer storage tank respectively, and the left end cover and the right end cover are sealed by the left distribution head and the right distribution head respectively.

[0009] The first heat exchanger is used for transporting LNG, the first heat exchanger comprises an LNG collector, a plurality of parallel flat tubes A, a plurality of heat exchange fins A and an NG collector, the first heat exchanger is arranged inside the outer storage tank and immersed in the cold storage agent evaporation gas, and the first heat exchanger is connected with the left distribution head, the second heat exchanger through the communication pipeline.

[0010] The second heat exchanger is used for transporting NG (LNG evaporation gas) and the cold carrier, the second heat exchanger comprises an NG heat exchange channel and a cold carrier heat exchange channel, the second heat exchanger is arranged inside the outer storage tank and immersed in the liquid phase cold storage agent, the second heat exchanger is arranged below the first heat exchanger, and the second heat exchanger is connected with the first heat exchanger, the third heat exchanger and the right distribution head through the communication pipeline.

[0011] The third heat exchanger is used for transporting the cold carrier, the third heat exchanger comprises a cold carrier inlet and outlet collector, a plurality of parallel flat tubes B, a plurality of heat exchange fins B and a cold carrier intermediate collector, the third heat exchanger is arranged inside the outer storage tank, the third heat exchanger is arranged below the first heat exchanger and the second heat exchanger and immersed in the bottom of the liquid phase cold storage agent, and the third heat exchanger is connected with the second heat exchanger and the left distribution head through the communication pipeline.

[0012] As a further technical scheme of the present application, the fixed support comprises a fixed plate A, a fixed plate B, a fixed plate C and a fixed plate D, the first heat exchanger, the second heat exchanger and the third heat exchanger are fixedly connected to the fixed support, and the fixed support is fixedly connected to the outer cylinder.

[0013] As a further technical scheme of the present application, the communication pipeline comprises an LNG inlet pipe, a cold carrier outlet pipe B and an NG inlet pipe, the left distribution head and the first heat exchanger are connected through the LNG inlet pipe, the left distribution head and the third heat exchanger are connected through the cold carrier outlet pipe B, and the first heat exchanger and the second heat exchanger are connected through the NG inlet pipe.

[0014] As a further technical scheme of the present application, the communication pipeline further comprises an NG outlet pipe, a cold carrier inlet pipe and a cold carrier outlet pipe A, the right distribution head and the second heat exchanger are connected through the NG outlet pipe and the cold carrier inlet pipe, and the second heat exchanger and the third heat exchanger are connected through the cold carrier outlet pipe A.

[0015] As a further technical scheme of the present application, the cold energy storage agent evaporates gas absorbs cold energy on the surface of the first heat exchanger and is liquefied, and the liquid phase cold energy storage agent absorbs heat on the surface of the third heat exchanger and is vaporized, so as to realize continuous conversion of energy.

[0016] As a further technical scheme of the present application, the right distribution head is provided with a cold energy storage agent filling opening communicated with the inside of the outer storage tank, and the right distribution head is provided with an NG gas outlet and a coolant liquid inlet.

[0017] As a further technical scheme of the present application, the left distribution head is provided with an LNG liquid inlet and a coolant liquid outlet.

[0018] As a further technical scheme of the present application, the flat tube A and the heat exchange fin A are provided with a support plate A outside, and the first heat exchanger is provided with a natural gas liquid inlet and a natural gas gas outlet.

[0019] As a further technical scheme of the present application, the second heat exchanger is provided with a second heat exchanger shell outside, and the second heat exchanger is provided with an NG gas inlet, an NG gas outlet, a coolant liquid inlet A and a coolant liquid outlet A.

[0020] As a further technical scheme of the present application, the flat tube B and the heat exchange fin B are provided with a support plate B outside, and the third heat exchanger is provided with a coolant liquid inlet B and a coolant liquid outlet B.

[0021] The present application has the following beneficial effects:

[0022] 1. The combined high-efficiency heat exchanger for cold energy air conditioning can realize that the low-temperature LNG is heated and vaporized into a gaseous state and overheated to a higher temperature through energy conversion, and then exchanges heat with the coolant, avoiding the ice blockage problem caused by direct heat exchange between the coolant and the low-temperature LNG.

[0023] 2. A large number of bubbles are generated in the process of vaporization of the liquid cold energy storage agent absorbing heat of the coolant, and convection disturbance is formed in the bubbles, so as to strengthen the heat exchange with the heat exchange wall, especially when the LNG automobile air conditioner is used, the disturbance of the cold energy storage agent is further intensified by the vibration of the engine or the shaking of the automobile during driving, so that the heat exchange efficiency of the heat exchanger can be greatly improved.

[0024] 3. Since three heat exchangers are used for heat exchange in different states, the heat exchange areas among the LNG, the cold energy storage agent evaporating gas, the low-temperature natural gas and the coolant, and the coolant and the cold energy storage agent are greatly improved, the heat exchange efficiency of the heat exchanger is effectively improved through the heat exchange fins, the heat exchanger has a compact structure, a small volume and a light weight, the influence on the load capacity of the automobile is minimized, the integration and matching of the LNG automobile air conditioning system and the LNG automobile are more convenient and flexible. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural diagram of a combined high-efficiency heat exchanger for cold energy air conditioning according to the present application;

[0026] Figure 2 is a structural diagram of a first heat exchanger of a combined high-efficiency heat exchanger for cold energy air conditioning according to the present application;

[0027] Figure 3 is a structural diagram of a second heat exchanger of a combined high-efficiency heat exchanger for cold energy air conditioning according to the present application;

[0028] Figure 4 is a structural diagram of a third heat exchanger of a combined high-efficiency heat exchanger for cold energy air conditioning according to the present application.

[0029] In the figure, 100 is an outer storage tank, 101 is a left end cover, 102 is a left distribution head, 103 is a right end cover, 104 is a right distribution head, 105 is a filling plug, 106 is an LNG inlet, 107 is an NG outlet, 108 is a coolant inlet, 109 is a coolant outlet, 110 is an outer cylinder, 200 is a first heat exchanger, 201 is an LNG collector, 202 is a flat tube A, 203 is an NG collector, 204 is an LNG inlet pipe, 205 is a support plate A, 206 is a heat exchange fin A, 207 is a natural gas inlet, 208 is a natural gas outlet, 300 is a second heat exchanger, 301 is a second heat exchanger shell, 302 is an NG inlet pipe, 303 is an NG outlet pipe, 304 is a coolant inlet pipe, 305 is a coolant outlet pipe A, 306 is an NG inlet, 307 is an NG outlet, 308 is a coolant inlet A, 309 is a coolant outlet A, 310 is an NG heat exchange channel, 311 is a coolant heat exchange channel, 400 is a third heat exchanger, 401 is a coolant inlet and outlet collector, 402 is a flat tube B, 403 is a coolant intermediate collector, 404 is a coolant outlet pipe B, 405 is a support plate B, 406 is a heat exchange fin B, 407 is a coolant inlet B, 408 is a coolant outlet B, 500 is a fixed support, 501 is a fixed plate A, 502 is a fixed plate B, 503 is a fixed plate C, 504 is a fixed plate D, 600 is a cold storage agent, and 601 is a cold storage agent evaporation gas. DETAILED DESCRIPTION

[0030] To make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in conjunction with specific embodiments.

[0031] Please refer to the attached Figure 1 -attached Figure 4 A combined high-efficiency heat exchanger for cold energy air conditioning includes an outer storage tank 100, a first heat exchanger 200, a second heat exchanger 300, a third heat exchanger 400, a communication pipeline, and a fixed support 500.

[0032] The outer storage tank 100 is used for storing the cold storage agent 600, the first heat exchanger 200 is used for heat exchange between LNG and the cold storage agent vapor 601, the second heat exchanger 300 is used for heat exchange between the LNG vapor and the cold carrier, the third heat exchanger 400 is used for heat exchange between the cold storage agent 600 and the cold carrier, and the fixed support 500 is used for fixedly connecting the outer storage tank 100, the first heat exchanger 200, the second heat exchanger 300 and the third heat exchanger 400;

[0033] The outer storage tank 100 is used for storing the cold storage agent 600, the cold storage agent 600 has the gas-liquid conversion characteristics and the freezing point temperature is lower than that of LNG, the cold storage agent 600 in the outer storage tank 100 presents two states of the gaseous cold storage agent vapor 601 and the liquid phase cold storage agent, the cold storage agent 600 can be vaporized into the cold storage agent vapor 601 after absorbing heat, the cold storage agent 600 is used for efficiently transferring the cold energy of LNG to the cold carrier, the cylindrical side wall of the outer storage tank 100 forms an outer cylinder body 110, the left end cover 101 and the right end cover 103 are respectively welded at two ends of the outer storage tank 100, and the left end cover 101 and the right end cover 103 are respectively sealed through the left distribution head 102 and the right distribution head 104;

[0034] The first heat exchanger 200 is used for transporting LNG, the first heat exchanger 200 includes an LNG collector 201, a plurality of parallel flat tubes A 202, a plurality of heat exchange fins A 206 and an NG collector 203, the first heat exchanger 200 is arranged in the outer storage tank 100 and immersed in the cold storage agent vapor 601, and the first heat exchanger 200 is connected with the left distribution head 102 and the second heat exchanger 300 through a communication pipeline;

[0035] The second heat exchanger 300 is used for transporting NGLNG vapor and the cold carrier, the second heat exchanger 300 includes an NG heat exchange channel 310 and a cold carrier heat exchange channel 311, the second heat exchanger 300 is arranged in the outer storage tank 100 and immersed in the liquid phase cold storage agent, the second heat exchanger 300 is arranged below the first heat exchanger 200, and the second heat exchanger 300 is connected with the first heat exchanger 200, the third heat exchanger 400 and the right distribution head 104 through a communication pipeline;

[0036] The third heat exchanger 400 is used for transporting the cold carrier, the third heat exchanger 400 includes a cold carrier inlet and outlet collector 401, a plurality of parallel flat tubes B 402, a plurality of heat exchange fins B 406 and a cold carrier intermediate collector 403, the third heat exchanger 400 is arranged in the outer storage tank 100, the third heat exchanger 400 is arranged below the first heat exchanger 200 and the second heat exchanger 300 and immersed in the bottom of the liquid phase cold storage agent, and the third heat exchanger 400 is connected with the second heat exchanger 300 and the left distribution head 102 through a communication pipeline.

[0037] Please refer to the accompanying drawings Figure 1In a preferred embodiment, the fixed support 500 comprises a fixed plate A 501, a fixed plate B 502, a fixed plate C 503 and a fixed plate D 504, the first heat exchanger 200, the second heat exchanger 300 and the third heat exchanger 400 are fixedly connected to the fixed support 500, and the fixed support 500 is fixedly connected to the outer cylinder 110.

[0038] Please refer to the attached drawings Figure 1 In a preferred embodiment, the communication pipeline comprises an LNG inlet pipe 204, a coolant outlet pipe B 404 and an NG inlet pipe 302, the left distribution head 102 and the first heat exchanger 200 are connected through the LNG inlet pipe 204, the left distribution head 102 and the third heat exchanger 400 are connected through the coolant outlet pipe B 404, and the first heat exchanger 200 and the second heat exchanger 300 are connected through the NG inlet pipe 302.

[0039] Please refer to the attached drawings Figure 1 In a preferred embodiment, the communication pipeline further comprises an NG outlet pipe 303, a coolant inlet pipe 304 and a coolant outlet pipe A 305, the right distribution head 104 and the second heat exchanger 300 are connected through the NG outlet pipe 303 and the coolant inlet pipe 304, and the second heat exchanger 300 and the third heat exchanger 400 are connected through the coolant outlet pipe A 305.

[0040] In a preferred embodiment, the cold storage agent evaporation gas 601 is liquefied by absorbing cold energy on the surface of the first heat exchanger 200, and the liquid phase cold storage agent is vaporized by absorbing heat on the surface of the third heat exchanger 400, so as to realize continuous conversion of energy.

[0041] Please refer to the attached drawings Figure 1 In a preferred embodiment, the right distribution head 104 is provided with a cold storage agent filling port connected to the inside of the outer storage tank 100, the right distribution head 104 is provided with an NG outlet 107 and a coolant inlet 108, and the right distribution head 104 is provided with a filling plug 105.

[0042] Please refer to the attached drawings Figure 1 In a preferred embodiment, the left distribution head 102 is provided with an LNG inlet 106 and a coolant outlet 109.

[0043] Please refer to the attached drawings Figure 1 and 2 In a preferred embodiment, the flat tube A 202 and the heat exchange fin A 206 are provided with a support plate A 205, and the first heat exchanger 200 is provided with a natural gas inlet 207 and a natural gas outlet 208.

[0044] LNG enters through LNG inlet 106, passes through LNG inlet pipe 204 and natural gas inlet 207, enters a cavity of LNG header 201, is then divided into two streams through flat tube A202.a, vaporizes into NG gas, and is then collected into NG header 203, is then divided into two streams through flat tube A202.b, and is collected into b cavity of LNG header 201, and is then discharged through natural gas outlet 208.

[0045] Please refer to the attached drawings Figure 1 and 3 In a preferred embodiment, the second heat exchanger 300 is externally provided with a second heat exchanger shell 301, and the second heat exchanger 300 is provided with a NG inlet 306, a NG outlet 307, a coolant inlet A 308, and a coolant outlet A 309.

[0046] NG gas is discharged through natural gas outlet 208, enters NG inlet 306 through NG inlet pipe 302, is then divided into two streams through NG heat exchange channel 310, is collected through NG outlet 307, and is then discharged through NG outlet pipe 303 to NG outlet 107; coolant is discharged through coolant outlet A 309, enters coolant inlet A 308 through coolant inlet pipe A 304, is then divided into two streams through coolant heat exchange channel 311, and is collected through coolant outlet A 309, and is then discharged through coolant outlet pipe A 305.

[0047] Please refer to the attached drawings Figure 1 and 4 In a preferred embodiment, the flat tube B402 and the heat exchange fin B406 are externally provided with a support plate B405, and the third heat exchanger 400 is provided with a coolant inlet B407 and a coolant outlet B408.

[0048] Coolant is discharged through coolant outlet pipe A 305, enters a cavity of coolant inlet and outlet header 401, is then divided into two streams through flat tube B402.a, is collected into coolant intermediate header 403, is then divided into two streams through flat tube B402.b, is collected into b cavity of coolant inlet and outlet header 401, and is then discharged through coolant outlet pipe B404 to coolant outlet 109.

[0049] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: LNG enters the first heat exchanger 200, exchanges heat with the cold storage agent vapor 601, vaporizes into a gaseous state and reaches a certain superheat degree, and then becomes low-temperature natural gas at -80 DEG C, and then enters the second heat exchanger 300 to exchange heat with the cold carrier, and is heated to 10 DEG C by the cold carrier, and then enters the engine for combustion and work after further re-warming by the water bath vaporizer. The 12 DEG C cold carrier is pressurized by the circulating pump and enters the second heat exchanger 300 to exchange heat with the low-temperature natural gas, and is cooled to 10 DEG C and then enters the third heat exchanger 400 to exchange heat with the liquid-phase cold storage agent, and is further cooled to 0 DEG C and then sent to the cold energy air conditioning assembly in the vehicle cabin through the pipeline to exchange heat with the air in the cabin, thereby producing a refrigeration effect, and the cold carrier is heated to 12 DEG C by the air and flows out of the cabin, and is pressurized by the circulating pump to participate in the circulation. The liquid-phase cold storage agent absorbs heat on the surface of the third heat exchanger 400, and the temperature of the liquid-phase cold storage agent is increased, a large number of bubbles are generated on the outer wall of the heat exchange flat tube B and the heat exchange fin B, the bubbles detach from the heat exchange surface, float upwards, and exchange heat with the cold storage agent 600 with a lower temperature, the bubbles gradually shrink, and the bubbles that have not been completely exchanged heat enter the upper part of the outer storage tank 100 and become the cold storage agent vapor 601. The cold storage agent vapor 601 is gathered at the top of the outer storage tank 100, absorbs the cold energy of LNG on the outer wall of the heat exchange flat tube A and the heat exchange fin A, and is liquefied by condensation, and flows downward along the wall under the action of gravity, falls into the cold storage agent 600 in a supercooled state, and mixes with the upper liquid surface of the cold storage agent 600. In this way, in the inner part of the outer storage tank 100, the cold storage agent is in a process of continuously exchanging heat, that is, boiling and vaporizing at the bottom, moving upwards, condensing and liquefying at the bottom, and moving downwards.

[0050] The combined high-efficiency heat exchanger for cold energy air conditioning disclosed in the present application can transfer the cold energy of LNG at a lower temperature to the cold carrier with a higher freezing point through the cold storage agent, thereby avoiding the ice blocking problem that may be caused by direct heat exchange between the conventional cold carrier and LNG; the first heat exchanger of the present application can vaporize LNG from a liquid state into gaseous natural gas (-80 DEG C) and condense the gaseous cold storage agent into a liquid state; the second heat exchanger of the present application can fully exchange heat between the low-temperature natural gas at -80 DEG C and the cold carrier at 12 DEG C, thereby increasing the temperature of the low-temperature natural gas to 10 DEG C and reducing the temperature of the cold carrier to 10 DEG C; and the third heat exchanger of the present application can vaporize the liquid-phase cold storage agent into bubbles that escape upwards, and reduce the temperature of the cold carrier to 0 DEG C by absorbing cold energy.

[0051] Those skilled in the art should understand that the above discussion of any embodiment is merely exemplary in nature and is not intended to imply that the present application, including the claims, be limited to these examples; the technical features among the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in details for the sake of brevity.

[0052] The present application is intended to cover all such alternatives, modifications, and variations as come within the scope of the broadest possible interpretation of the appended claims. Accordingly, any and all such alternations, modifications, equivalents, improvements and the like are intended to be encompassed by the present application.

Claims

1. A combined high-efficiency heat exchanger for cold energy air conditioning, characterized in that, The application relates to a heat exchange device for LNG and NG, which comprises the following parts: an outer storage tank (100), a first heat exchanger (200), a second heat exchanger (300), a third heat exchanger (400), a communication pipeline and a fixing support (500); the outer storage tank (100) is used for storing a cold storage agent (600), the cold storage agent (600) has gas-liquid conversion characteristics and the freezing point of the cold storage agent (600) is lower than the temperature of LNG; the cold storage agent (600) in the outer storage tank (100) exists in two states of gaseous cold storage agent evaporation gas (601) and liquid phase cold storage agent; the cylindrical side wall of the outer storage tank (100) forms an outer cylinder (110); the left end cover (101) and the right end cover (103) are respectively welded on the two ends of the outer storage tank (100); the left end cover (101) and the right end cover (103) are respectively sealed through the left distribution head (102) and the right distribution head (104); the first heat exchanger (200) is used for conveying LNG; the first heat exchanger (200) comprises an LNG collector (201), a plurality of parallel flat tubes A (202), a plurality of heat exchange fins A (206) and an NG collector (203); the first heat exchanger (200) is arranged in the outer storage tank (100) and is immersed in the cold storage agent evaporation gas (601); the first heat exchanger (200) is connected with the left distribution head (102) and the second heat exchanger (300) through a communication pipeline; the second heat exchanger (300) is used for conveying NG and a cold carrier; the second heat exchanger (300) comprises an NG heat exchange channel (310) and a cold carrier heat exchange channel (311); the second heat exchanger (300) is arranged in the outer storage tank (100) and is immersed in the liquid phase cold storage agent; the second heat exchanger (300) is arranged below the first heat exchanger (200); the second heat exchanger (300) is connected with the first heat exchanger (200), the third heat exchanger (400) and the right distribution head (104) through a communication pipeline; the third heat exchanger (400) is used for conveying the cold carrier; the third heat exchanger (400) comprises a cold carrier inlet and outlet collector (401), a plurality of parallel flat tubes B (402), a plurality of heat exchange fins B (406) and a cold carrier intermediate collector (403); the third heat exchanger (400) is arranged in the outer storage tank (100); the third heat exchanger (400) is arranged below the first heat exchanger (200) and the second heat exchanger (300) and is immersed in the bottom of the liquid phase cold storage agent; the third heat exchanger (400) is connected with the second heat exchanger (300) and the left distribution head (102) through a communication pipeline.

2. The combined high-efficiency heat exchanger for cold energy air conditioning according to claim 1, characterized in that, the fixing support (500) comprises a fixing plate A (501), a fixing plate B (502), a fixing plate C (503) and a fixing plate D (504); the first heat exchanger (200), the second heat exchanger (300) and the third heat exchanger (400) are fixedly connected to the fixing support (500) from top to bottom; and the fixing support (500) is fixedly connected to the outer cylinder (110).

3. The combined high-efficiency heat exchanger for cold energy air conditioning according to claim 2, characterized in that, The communication pipeline comprises an LNG inlet pipe (204), a coolant outlet pipe B (404) and an NG inlet pipe (302), the left distribution head (102) and the first heat exchanger (200) are connected through the LNG inlet pipe (204), the left distribution head (102) and the third heat exchanger (400) are connected through the coolant outlet pipe B (404), and the first heat exchanger (200) and the second heat exchanger (300) are connected through the NG inlet pipe (302).

4. The combined high-efficiency heat exchanger for cold energy air conditioning according to claim 3, characterized in that, The communication pipeline further comprises an NG outlet pipe (303), a coolant inlet pipe (304) and a coolant outlet pipe A (305), the right distribution head (104) and the second heat exchanger (300) are connected through the NG outlet pipe (303) and the coolant inlet pipe (304), and the second heat exchanger (300) and the third heat exchanger (400) are connected through the coolant outlet pipe A (305).

5. The combined high-efficiency heat exchanger for cold energy air conditioning according to claim 4, characterized in that, The cold energy is absorbed by the cold storage agent evaporation gas (601) on the surface of the first heat exchanger (200) to be liquefied, and the heat is absorbed by the liquid-phase cold storage agent on the surface of the third heat exchanger (400) to be vaporized, so that the energy is continuously converted.

6. The combined high-efficiency heat exchanger for cold energy air conditioning according to claim 5, characterized in that, The right distribution head (104) is provided with a cold storage agent filling port connected with the inside of the outer storage tank (100), and the right distribution head (104) is provided with an NG outlet (107) and a coolant inlet (108), and a filling plug (105) is installed in the middle of the right distribution head (104).

7. The combined high-efficiency heat exchanger for cold energy air conditioning according to claim 6, characterized in that, The left distribution head (102) is provided with an LNG inlet (106) and a coolant outlet (109).

8. The combined high-efficiency heat exchanger for cold energy air conditioning according to claim 7, characterized in that, The flat pipe A (202) and the heat exchange fin A (206) are provided with a support plate A (205) outside, and the first heat exchanger (200) is provided with a natural gas inlet (207) and a natural gas outlet (208).

9. The combined high-efficiency heat exchanger for cold energy air conditioning according to claim 8, characterized in that, The second heat exchanger (300) is provided with a second heat exchanger shell (301) outside, and the second heat exchanger (300) is provided with an NG inlet (306), an NG outlet (307), a coolant inlet A (308) and a coolant outlet A (309).

10. The combined high-efficiency heat exchanger for cold energy air conditioning according to claim 9, characterized in that, The flat pipe B (402) and the heat exchange fin B (406) are provided with a support plate B (405) outside, and the third heat exchanger (400) is provided with a coolant inlet B (407) and a coolant outlet B (408).

Images