Automobile air conditioning refrigeration system, test method and hydrogen-powered automobile

Abstract

The present invention provides an automobile air conditioning refrigeration system, a test method and a hydrogen-powered automobile, wherein the automobile air conditioning refrigeration system comprises: a compressor, a condenser, an air conditioning coaxial tube and an evaporator which are sequentially connected to form a loop, wherein the air conditioning coaxial tube has a first loop and a second loop; both ends of the first loop are connected to the pipeline between the condenser and the evaporator via the air conditioning coaxial tube; both ends of the second loop are connected to the pipeline between the condenser and the compressor via the air conditioning coaxial tube. The present invention improves the refrigeration capacity of the automobile air conditioning system through the air conditioning coaxial tube, further reduces the system energy consumption, and improves the air conditioning refrigeration efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile air conditioning, and in particular to an automobile air conditioning refrigeration system, a testing method and a hydrogen-powered automobile. Background Art

[0002] Whether it is a traditional fuel vehicle, or a pure electric vehicle, hybrid vehicle, or hydrogen energy vehicle, the energy consumption of the vehicle air conditioning system has a very important impact on the vehicle's mileage. However, the cooling capacity of the current vehicle air conditioning system is insufficient, and the system energy consumption needs to be further reduced. Summary of the invention

[0003] The problem solved by the present invention is that for the mainstream automobile air-conditioning refrigeration system in the current market, the refrigeration capacity of the existing automobile air-conditioning system is insufficient, and the energy consumption of the system needs to be further reduced.

[0004] In order to solve the above problems, the present invention provides an automobile air conditioning refrigeration system, comprising:

[0005] A compressor, a condenser, an air conditioning coaxial tube and an evaporator connected in sequence to form a circuit, wherein the air conditioning coaxial tube has a first circuit and a second circuit;

[0006] Both ends of the first loop are connected to the pipeline between the condenser and the evaporator via the air conditioning coaxial tube;

[0007] Both ends of the second loop are connected to the pipeline between the condenser and the compressor via the air-conditioning coaxial tube.

[0008] The present invention uses the air-conditioning coaxial tube to effectively utilize the low-pressure tube to transfer the heat of the high-pressure tube, thereby realizing secondary heat exchange of the air-conditioning system, improving the refrigeration capacity of the automobile air-conditioning system, further reducing the system energy consumption, and improving the air-conditioning refrigeration efficiency.

[0009] Furthermore, the air-conditioning coaxial tube comprises an outer tube and an inner tube, the outer tube is sleeved on the outer side of the inner tube, a high-pressure medium cavity is formed between the outer tube and the inner tube, a low-pressure medium cavity is formed inside the inner tube, both ends of the inner tube extend beyond the distance of one end of the outer tube, low-pressure interfaces are provided at both ends of the inner tube, both ends of the outer tube are also provided with shrinkage openings, the shrinkage openings are welded and fixed to the inner tube (301), a mounting hole is opened on the outer side of the outer tube near the shrinkage opening, a reducing interface is also provided on the outer circumference of the outer tube (302), the large-diameter end of the reducing interface is welded and fixed to the mounting hole, the small-diameter end of the reducing interface is welded and fixed to one end of the high-pressure tube, a high-pressure interface is provided at the other end of the high-pressure tube, and the inner wall and outer wall of the inner tube are both provided with spiral grooves.

[0010] Therefore, the outer tube and the high-pressure tube are connected by a reducer interface, which greatly reduces the refrigerant flow resistance on the high-pressure side and improves the heat exchange effect of the coaxial tube; the inner and outer walls of the inner tube are provided with spiral grooves to enhance the heat exchange effect inside the tube. The heat exchange efficiency of the coaxial heat exchanger is improved, the energy transfer process is reduced, and energy is used more reasonably and effectively.

[0011] Furthermore, it also includes a first expansion valve, which is arranged on the circuit between the air-conditioning coaxial tube and the evaporator along the flow direction of the refrigerant and on the first circuit.

[0012] Whether the first circuit is connected to the loop is controlled by the first expansion valve, whereby the first expansion valve allows the medium-temperature and high-pressure liquid refrigerant to pass through its throttling to become low-temperature and low-pressure wet steam, and then the refrigerant absorbs heat in the evaporator to achieve a cooling effect.

[0013] Furthermore, it also includes a second expansion valve, which is arranged on the circuit between the air-conditioning coaxial tube and the compressor along the refrigerant flow direction and on the second circuit.

[0014] The second expansion valve is used to control whether the second circuit is connected to the circuit. Thus, the second expansion valve allows the second circuit to expand through the second expansion valve and then enter the coaxial tube for heat exchange, and then flow into the compressor for compression and then enter the condenser for condensation.

[0015] Furthermore, it also includes a refrigerant filling device, which includes a refrigerant tank and a refrigerant filling pipeline, one end of the refrigerant filling pipeline is connected to the refrigerant tank, and the other end of the refrigerant filling pipeline is connected to the loop.

[0016] In this way, when the refrigerant in the system is insufficient, the refrigerant in the refrigerant tank can be added to the system through the refrigerant filling pipeline, realizing automatic refrigerant filling without manual maintenance, thereby reducing maintenance costs.

[0017] Furthermore, the refrigerant tanks are connected to the refrigerant filling pipelines through refrigerant filling circuits, and the refrigerant filling pipelines are provided with refrigerant filling valves.

[0018] The refrigerant content is replenished by controlling the on-off of the refrigerant filling valve, which is simple, convenient and highly controllable.

[0019] Furthermore, a filter is provided in front of the refrigerant filling valve along the refrigerant flow direction and on the refrigerant filling pipeline.

[0020] Setting a filter can prevent impurities from entering the circulation loop of the automobile air conditioning refrigeration system.

[0021] The present invention also provides a method for testing an automobile air conditioning refrigeration system, comprising:

[0022] S1: Turn on the compressor to allow the refrigerant to flow in the test circuit, and the refrigerant enters the air conditioner coaxial tube through the condenser;

[0023] S2: The first circuit and the second circuit of the air-conditioning coaxial tube are respectively provided with a first expansion valve and a second expansion valve, and the test circuit of the air-conditioning coaxial tube is controlled by the first expansion valve and the second expansion valve respectively, and the high-pressure tube temperature and pressure measuring points and the low-pressure tube temperature and pressure measuring points are set as needed;

[0024] S3: regulating and controlling the cooling water volume of the condenser, the opening of the regulating valve and the input power of the compressor so that the temperature and pressure of the refrigerant at the inlet of the air conditioner coaxial tube meet the test conditions;

[0025] S4: Controlling the refrigerant flow rate flowing through the air-conditioning coaxial tube by the rotation speed or frequency of the compressor.

[0026] By controlling the working status of each component in the test system, the temperature and pressure at the inlet of the high-pressure pipe and the low-pressure pipe of the air-conditioning coaxial tube, as well as the flow rate through the high-pressure pipe of the air-conditioning coaxial tube can always be maintained under the test conditions, thereby accurately monitoring whether the performance of the air-conditioning coaxial tube meets the requirements.

[0027] The present invention also provides a hydrogen-powered automobile, comprising the automobile air-conditioning refrigeration system as described above.

[0028] The beneficial effects of the hydrogen-powered vehicle provided by the present invention compared with the prior art are the same as the beneficial effects of the automobile air-conditioning refrigeration system compared with the prior art, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A system composition block diagram of an automobile air conditioning refrigeration system in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the air-conditioning coaxial tube in an embodiment of the present invention;

[0031] Figure 3 Schematic diagram of the process of testing the automobile air conditioning system in an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 10-compressor; 20-condenser; 30-air conditioning coaxial tube; 301-inner tube; 302-outer tube; 303-narrowing; 304-low pressure interface; 305-high pressure interface; 306-reducing interface; 307-high pressure pipe; 308-spiral groove; 40-evaporator; 50-refrigerant filling device; 501-refrigerant tank; 502-refrigerant filling pipeline; 503-refrigerant filling valve; 504-filter; 60-first expansion valve; 70-second expansion valve. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] Aiming at the insufficient refrigeration capacity of the automobile air conditioning system in the prior art, which increases fuel consumption, the embodiment of the present invention provides an automobile air conditioning refrigeration system, such as Figure 1 As shown, in a system in which a compressor 10, a condenser 20, an air-conditioning coaxial tube 30 and an evaporator 40 are connected in sequence to form a loop, a first loop and a second loop are added, and both ends of the first loop are connected to the pipeline between the condenser 20 and the evaporator 40 via the air-conditioning coaxial tube 30, and both ends of the second loop are connected to the pipeline between the condenser 20 and the compressor 10 via the air-conditioning coaxial tube 30.

[0036] In this embodiment, an air conditioning coaxial tube 30 is used between the evaporator 40 and the condenser 20. The air conditioning coaxial tube 30 is equivalent to an internal heat exchanger. In the coaxial pipeline, the areas where the hot fluid and the cold gas circulate are separated from each other and the flow directions are opposite. What flows out of the condenser 20 is a high-temperature liquid refrigerant, and what flows out of the evaporator 40 is a low-temperature gaseous refrigerant. When the two meet, the high-temperature liquid refrigerant is cooled, and the heat of the high-pressure pipe is effectively transferred by the low-pressure pipe, so as to realize the secondary heat exchange of the air-conditioning system, improve the refrigeration capacity of the automobile air-conditioning system, further reduce the system energy consumption, and improve the air-conditioning refrigeration efficiency.

[0037] Combination Figure 2As shown, the air-conditioning coaxial tube 30 includes an outer tube 302 and an inner tube 301, the outer tube 302 is sleeved on the outside of the inner tube 301, a high-pressure medium cavity is formed between the outer tube 302 and the inner tube 301, a low-pressure medium cavity is formed inside the inner tube 301, both ends of the inner tube 301 extend out of one end of the outer tube 302, low-pressure interfaces 304 are provided at both ends of the inner tube 301, and both ends of the outer tube 302 are also provided with reduction openings 303, the reduction openings 303 are welded and fixed to the inner tube 301, a mounting hole is opened on the outside of the outer tube 302 near the reduction opening 303, a reducing interface 306 is also provided on the outer circumference of the outer tube 302, the large-diameter end of the reducing interface 306 is welded and fixed to one end of the high-pressure tube 307, a high-pressure interface 305 is provided at the other end of the high-pressure tube 307, and a spiral groove 308 is provided on the inner wall and the outer wall of the inner tube 301.

[0038] In this embodiment, the outer tube 302 and the high-pressure tube 307 are connected by a reducer interface 306, which greatly reduces the refrigerant flow resistance on the high-pressure side and improves the heat exchange effect of the coaxial tube. In addition, the inner wall and the outer wall of the inner tube 301 are both provided with spiral grooves 308, so that the heat exchange effect in the tube is enhanced. The heat exchange efficiency of the air conditioner coaxial tube 30 is improved, the energy transfer process is reduced, and energy is used more reasonably and effectively.

[0039] It should be noted that the air conditioner coaxial tube 30 can also be designed as an integrated structure, a separate structure or a threaded structure. The coaxial tubes of the integrated structure and the separate structure have high processing precision; the coaxial tubes of the threaded structure are easy to obtain, have strong versatility and low cost.

[0040] The automobile air conditioning refrigeration system also includes a first expansion valve 60, which is arranged on the circuit between the air conditioning coaxial tube 30 and the evaporator 40 along the refrigerant flow direction and on the first circuit. The first expansion valve 60 is used to control the on-off of the first circuit.

[0041] When the refrigeration system is operating normally, the refrigerant is split into two circuits after passing through the condenser 20. The first circuit passes through the air-conditioning coaxial tube 30 and then expands through the first expansion valve 60, enters the air-conditioning assembly to complete evaporation and heat absorption, and reduces the temperature of the air entering the passenger compartment. After flowing out of the air-conditioning box, it enters the compressor 10, and after being compressed by the compressor 10, it enters the condenser 20 for condensation.

[0042] The automobile air conditioning refrigeration system further includes a second expansion valve 70 , which is provided on the circuit between the air conditioning coaxial tube 30 and the compressor 10 along the refrigerant flow direction and on the second circuit.

[0043] When the refrigeration system is operating normally, the refrigerant is split into two circuits after passing through the condenser 20. The second circuit is expanded by the second expansion valve 70, enters the air-conditioning coaxial tube 30 for heat exchange, and then flows into the compressor 10 for compression before entering the condenser 20 for condensation.

[0044] The refrigeration system further includes a refrigerant filling device 50, and the controller further controls the refrigerant filling device 50 to add refrigerant into the refrigerant circulation loop according to the content of the refrigerant to be supplemented.

[0045] Preferably, the refrigerant filling device 50 includes a refrigerant tank 501 and a refrigerant filling pipeline 502, one end of the refrigerant filling pipeline 502 is connected to the refrigerant tank 501, and the other end of the refrigerant filling pipeline 502 is connected to the refrigerant circulation loop. Preferably, in order to facilitate the addition of refrigerant, the other end of the refrigerant filling pipeline 502 is connected to the pipeline between the compressor 10 and the evaporator 40. The refrigerant in the corresponding refrigerant tank can be added to the refrigerant circulation loop, so as to achieve targeted replenishment.

[0046] Furthermore, the refrigerant tank 501 is connected to the refrigerant filling pipeline 502 through the refrigerant filling circuit, and a refrigerant filling valve 503 is provided on the refrigerant filling circuit, and the refrigerant filling valve 503 is used to control whether the refrigerant in the refrigerant tank is added into the circuit. Preferably, a filter 504 is provided in front of the refrigerant filling valve 503 along the refrigerant flow direction and on the refrigerant filling circuit to prevent impurities from entering the circulation circuit of the automobile air conditioning refrigeration system.

[0047] It should be noted that the automobile air conditioning refrigeration system provided in this embodiment can automatically identify the lack of refrigerant content and can automatically add refrigerant with corresponding components, and the filling amount is controllable, without the need for manual maintenance, thereby reducing maintenance costs.

[0048] Furthermore, the automobile air conditioning refrigeration system also includes an air conditioning assembly, which has a controller therein, and the controller is electrically connected to the compressor 10 and the air conditioning coaxial tube 30 .

[0049] By combining the air conditioning assembly and the air conditioning coaxial tube with the air-supplying reheat-increasing compressor and utilizing the controller of the air conditioning assembly, the exhaust temperature at the compressor outlet can be effectively reduced under severe working conditions, thereby enhancing system reliability and improving the system's energy efficiency ratio, thereby achieving automatic control of the refrigeration system and improving efficiency.

[0050] Furthermore, the air conditioning coaxial tube 30 is made of a large-diameter aluminum tube.

[0051] In this embodiment, the air conditioning coaxial tube 30 is made of a large-diameter aluminum tube. Although the processing is complicated, the aluminum tube can improve the air conditioning refrigeration effect and save fuel consumption. Compared with ordinary tubes, ordinary tubes are separated. Although it is convenient to process and easy to obtain, the low-pressure pipeline of the air conditioning absorbs heat at low temperature and dissipates energy. The low-pressure tube is connected to the outlet of the evaporator 40. During the automobile air conditioning refrigeration process, the temperature of the evaporator 40 is low, and the temperature of the refrigerant coming out is low. Therefore, during the air conditioning refrigeration process in summer, condensed water droplets will appear on the surface of the low-pressure pipeline. This is the embodiment of the heat absorption of the low-pressure pipeline. This part of the energy will be dissipated to the engine compartment through the heat transfer of the low-pressure pipe, which will increase the load of the compressor and the engine.

[0052] The air-conditioning coaxial tube 30 in this embodiment can improve the air-conditioning refrigeration effect, and the air outlet temperature can be reduced by 3 to 4 degrees; it can save fuel consumption, improve the refrigeration capacity, and use a smaller displacement compressor to make up for the defects such as insufficient refrigeration capacity of the air-conditioning system; the ordinary pipeline can be changed to a coaxial tube without changing the assembly dimensions of other parts.

[0053] like Figure 3 As shown, the present invention also provides a method for testing an automobile air conditioning refrigeration system, comprising:

[0054] S1: Turn on the compressor 10 to allow the refrigerant to flow in the test circuit, and the refrigerant enters the air conditioning coaxial tube 30 through the condenser 20;

[0055] S2: The first circuit and the second circuit of the air-conditioning coaxial tube 30 are respectively provided with a first expansion valve 60 and a second expansion valve 70, and the test circuit of the air-conditioning coaxial tube 30 is controlled by the first expansion valve 60 and the second expansion valve 70, respectively, and the temperature and pressure measuring points of the high-pressure tube 307 and the temperature and pressure measuring points of the low-pressure tube are set as needed;

[0056] S3: regulating the cooling water volume of the condenser 20, the opening of the regulating valve and the input power of the compressor 10 so that the temperature and pressure of the refrigerant at the inlet of the air-conditioning coaxial tube 30 meet the test conditions;

[0057] S4: The refrigerant flow rate flowing through the air-conditioning coaxial tube 30 is controlled by the rotation speed or frequency of the compressor 10 .

[0058] By controlling the working status of each component in the test system, the temperature and pressure at the inlet of the high-pressure pipe and the low-pressure pipe of the air-conditioning coaxial tube, as well as the flow rate through the high-pressure pipe of the air-conditioning coaxial tube can always be maintained under the test conditions, thereby accurately monitoring whether the performance of the air-conditioning coaxial tube meets the requirements.

[0059] The present invention also provides a hydrogen-powered automobile, comprising the automobile air-conditioning refrigeration system described above.

[0060] The beneficial effects of the hydrogen-powered vehicle provided by the present invention compared with the prior art are the same as the beneficial effects of the automobile air-conditioning refrigeration system compared with the prior art, which will not be repeated here.

[0061] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A method for testing a vehicle air conditioning refrigeration system, characterized in that: The automobile air conditioning refrigeration system comprises a compressor (10), a condenser (20), an air conditioning coaxial tube (30) and an evaporator (40) which are connected in sequence to form a loop, and the air conditioning coaxial tube (30) has a first loop and a second loop; both ends of the first loop are connected to the pipeline between the condenser (20) and the evaporator (40) via the air conditioning coaxial tube (30); and both ends of the second loop are connected to the pipeline between the condenser (20) and the compressor (10) via the air conditioning coaxial tube (30); It also includes a first expansion valve (60) and a second expansion valve (70), wherein the first expansion valve (60) is arranged along the flow direction of the refrigerant and on the first circuit, and the first expansion valve (60) is arranged on the circuit between the air-conditioning coaxial tube (30) and the evaporator (40); The second expansion valve (70) is arranged along the flow of the refrigerant and on the second circuit, and on the circuit between the air-conditioning coaxial tube (30) and the compressor (10); The air conditioner coaxial tube (30) comprises an outer tube (302) and an inner tube (301); the outer tube (302) is sleeved on the outer side of the inner tube (301); a high-pressure medium cavity is formed between the outer tube (302) and the inner tube (301); a low-pressure medium cavity is formed inside the inner tube (301); both ends of the inner tube (301) extend beyond the distance of one end outside the outer tube (302); low-pressure interfaces (304) are provided at both ends of the inner tube (301); and both ends of the outer tube (302) are also provided with constrictions (303); the constrictions (304) are provided at both ends of the inner tube (301); The outer tube (302) is provided with a mounting hole outside the outer tube (302) near the shrinkage (303), and the outer circumference of the outer tube (302) is also provided with a reducing interface (306). The large diameter end of the reducing interface (306) is welded and fixed to the mounting hole, and the small diameter end of the reducing interface (306) is welded and fixed to one end of the high-pressure tube (307). The other end of the high-pressure tube (307) is provided with a high-pressure interface (305), and the inner wall and the outer wall of the inner tube (301) are both provided with a spiral groove (308); The test method includes: S1: Turning on the compressor (10) to allow the refrigerant to flow in the test circuit, and the refrigerant enters the air-conditioning coaxial tube (30) through the condenser (20); S2: A first expansion valve (60) and a second expansion valve (70) are respectively provided on the first circuit and the second circuit of the air-conditioning coaxial tube (30), and the test circuit of the air-conditioning coaxial tube (30) is controlled by the first expansion valve (60) and the second expansion valve (70), respectively, and the temperature and pressure measuring points of the high-pressure tube (307) and the temperature and pressure measuring points of the low-pressure tube are set as required; S3: regulating and controlling the cooling water volume of the condenser (20), the opening of the regulating valve, and the input power of the compressor (10) so that the temperature and pressure of the refrigerant at the inlet of the air-conditioning coaxial tube (30) meet the test conditions; S4: Controlling the flow rate of the refrigerant flowing through the air-conditioning coaxial tube (30) by the rotation speed or frequency of the compressor (10).

2. The method for testing the automobile air conditioning refrigeration system according to claim 1, characterized in that: It also includes a refrigerant filling device (50), which includes a refrigerant tank (501) and a refrigerant filling pipeline (502), one end of the refrigerant filling pipeline (502) is connected to the refrigerant tank (501), and the other end of the refrigerant filling pipeline (502) is connected to the loop.

3. The method for testing the automobile air conditioning refrigeration system according to claim 2, characterized in that: The refrigerant tank (501) is connected to the refrigerant filling pipeline (502) through a refrigerant filling circuit, and a refrigerant filling valve (503) is provided on the refrigerant filling pipeline (502).

4. The method for testing the automobile air conditioning refrigeration system according to claim 3, characterized in that: A filter (504) is provided in front of the refrigerant filling valve (503) along the refrigerant flow direction and on the refrigerant filling pipeline (502).

5. The method for testing the automobile air conditioning refrigeration system according to claim 1, characterized in that: It also includes an air conditioning assembly, wherein the air conditioning assembly has a controller, and the controller is electrically connected to the compressor (10) and the air conditioning coaxial tube (30).

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