Triangular circulation heat management system and method for automobile air conditioner

Abstract

The invention provides a triangular circulation heat management system and method for an automobile air conditioner. The system comprises a host system, a condensation system and a compression system. The main machine system comprises an air conditioner main machine with an evaporator, and the evaporator evaporates condensate water in the main machine system into water vapor. The condensing system comprises a condenser, one end of the condensing system is communicated with the host system through a pipeline, and the condensing system condenses water vapor into liquid water; the compression system comprises a compressor, the compression system communicates with the main machine system and the condensation system through pipelines, and the compressor provides heat for the evaporator. A first electronic expansion valve is arranged between the main machine system and the condensation system, a second electronic expansion valve is arranged between the main machine system and the compression system, the two ends of the compression system are connected through a third electronic expansion valve, and when the third electronic expansion valve is opened, the two ends of the compression system are directly communicated. The triangular circulation heat management system of the automobile air conditioner can solve the problem that peculiar smell is generated when the air conditioner is started in the prior art.

Description

Technical Field

[0001] The invention relates to an automobile thermal management system, in particular to an automobile air-conditioning delta cycle thermal management system and method. Background Art

[0002] At present, when the car air conditioner is in cooling mode, the air temperature suddenly drops below the dew point temperature. Condensation water is easily precipitated in the air and adheres to the surface of the evaporator or drips into the air-conditioning box, causing the air-conditioning box to be in a humid environment for a long time, which is easy to cause mold and is accompanied by a sour smell. When the refrigerant temperature is around 0°C, the microorganisms in the air will be frozen on the surface of the evaporator. When the control strategy limits the compressor speed, the user actively exits or other factors cause the air-conditioning system to shut down, the microorganisms will be thawed and blown out with the air-conditioning wind. The sour smell causes discomfort to the user.

[0003] The existing solution is to install an activated carbon filter to absorb odors in front of the evaporator, but this solution can only absorb part of the odor and has very limited effect on solving the odor problem. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a car air-conditioning triangle cycle thermal management system for solving the problem of odor generated when the air conditioner is turned on in the prior art. It mainly relates to a car air-conditioning triangle cycle thermal management system, which adds a branch connecting the two ends of the compressor so that the compressor can open the branch when the suction superheat is low, thereby effectively increasing the dryness of the main circuit and improving the working stability of the system.

[0005] The present invention provides a triangular cycle thermal management system for an automobile air conditioner, comprising:

[0006] A host system, the host system comprising an air conditioning host including an evaporator, the evaporator evaporating condensed water in the host system into water vapor;

[0007] A condensation system, wherein the condensation system comprises a condenser, and one end of the condensation system is connected to the host system through a pipeline;

[0008] A compression system, the compression system comprising a compressor, the compression system being connected to the host system and the condensing system through pipelines, respectively, and the compressor providing heat to the evaporator;

[0009] Among them, a first electronic expansion valve is provided between the host system and the condensing system, a second electronic expansion valve is provided between the host system and the compression system, and the two ends of the compression system are connected through a third electronic expansion valve. When the third electronic expansion valve is opened, the two ends of the compression system are directly connected.

[0010] In one embodiment of the present invention, the host system further includes a blower, and the blower performs work on the water vapor in the host system to transport the water vapor into the car cabin.

[0011] In one embodiment of the present invention, the compression system further comprises a suction superheat detection device, and the suction superheat detection device detects the suction superheat of the compressor.

[0012] In one embodiment of the present invention, the intake superheat detection device is preset with an intake superheat threshold. When the intake superheat detected by the intake superheat detection device is higher than the intake superheat threshold, the thermal management system operates normally and the third electronic expansion valve is closed.

[0013] In one embodiment of the present invention, when the suction superheat detected by the suction superheat detection device is lower than the suction superheat threshold, the third electronic expansion valve is opened.

[0014] In one embodiment of the present invention, a temperature sensor is further provided on the pipeline. When the temperature sensor detects that the temperature of the pipeline between the compression system and the condensation system is high, the compressor increases the operating power to increase the suction temperature.

[0015] The present invention also provides a thermal management method for a delta cycle of an automobile air conditioner, comprising:

[0016] S1: Turn on the compressor, the compressor provides heat to the evaporator, and the evaporator evaporates the condensed water on its surface to form water vapor;

[0017] S2: Turn on the blower to blow air, and the blower blows the water vapor from the evaporator to the car cabin;

[0018] S3: The suction superheat detection device detects the suction superheat of the compressor. When the suction superheat is lower than the suction superheat threshold, the third electronic expansion valve connected to both ends of the compressor is opened;

[0019] S4: Shut down the operation of each device and end the triangle cycle thermal management process.

[0020] In one embodiment of the present invention, the evaporator is arranged in an air-conditioning host, and the air-conditioning host is connected to the compressor and the condenser through pipelines respectively.

[0021] In one embodiment of the present invention, a temperature sensor is further provided on the pipeline between the compression system and the condensation system. In S3, after the third electronic expansion valve is opened, when the temperature sensor detects that the pipeline temperature is high, the compressor suction temperature increases.

[0022] In one embodiment of the present invention, a first electronic expansion valve is provided between the condenser and the air conditioner host, and a second electronic expansion valve is provided between the air conditioner host and the compressor, and the first electronic expansion valve and the second electronic expansion valve are in a normally open state.

[0023] The automotive air-conditioning triangle cycle thermal management system and method of the present invention do not rely on external heat-absorbing elements, use the triangle cycle to ensure stable operation of the system, and use the evaporator as a condenser to generate heat by itself. The blower is used to supply air to remove moisture from the evaporator core and surrounding sponge seals, and a hot air bypass loop is added. When the triangle cycle performs the drying function, protective system suction superheat compensation is performed based on suction superheat feedback, thereby improving the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the working principle of the thermal management system of the present invention;

[0026] Figure 2 A schematic diagram showing the structure of a thermal management system of the present invention;

[0027] Figure 3 The figure is a flow chart showing the steps of the thermal management method of the present invention. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0029] It should be noted that, in the absence of conflict, the features in the following examples and embodiments can be combined with each other. It should also be understood that the terms used in the examples of the present invention are intended to describe specific embodiments rather than to limit the scope of the present invention. The test methods in the following examples that do not specify specific conditions are usually carried out under conventional conditions or under conditions recommended by the manufacturers.

[0030] See also Figures 1 to 3. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0031] The present invention provides a triangular cycle thermal management system for automobile air conditioners, which can be used to solve the problem of odor generated when turning on the air conditioner in the prior art. Specifically, the triangular cycle thermal management system for automobile air conditioners of the present invention includes a host system, a condensation system and a compression system. The host system includes an air conditioner host including an evaporator, and the evaporator evaporates the condensed water in the host system into water vapor; the condensation system includes a condenser, and one end of the condensation system is connected to the host system through a pipeline, and the condensation system condenses the water vapor into liquid water; the compression system includes a compressor, and the compression system is connected to the host system and the condensation system through pipelines, respectively, and the compressor provides heat to the evaporator; wherein a first electronic expansion valve is provided between the host system and the condensation system, a second electronic expansion valve is provided between the host system and the compression system, and both ends of the compression system are connected through a third electronic expansion valve, and when the third electronic expansion valve is opened, both ends of the compression system are directly connected.

[0032] At present, when the air temperature of automobile air conditioners drops below the dew point temperature in the cooling mode, condensed water is easily precipitated in the air, attached to the surface of the evaporator, or dripped into the air conditioner box, causing the air conditioner box to be in a humid environment for a long time, which is easy to cause mold and accompanied by a sour smell. When the refrigerant temperature is around 0°C, the microorganisms in the air will be frozen on the surface of the evaporator. When the control strategy limits the compressor speed, the user actively exits or other factors cause the air conditioning system to shut down, the microorganisms are thawed and blown out with the air conditioning wind, and the sour smell causes discomfort to the user. The existing implementation scheme is to install an activated carbon filter element that absorbs odors in front of the evaporator, but this scheme can only absorb part of the odor and has a very limited effect on solving the odor problem. The present invention uses refrigerant to heat the evaporator surface, dry the moisture in the evaporator and the air conditioner box, avoid the humid environment in the air conditioner box, accelerate the circulation of air in the host system through the blower, improve the drying effect, thereby preventing mold growth and solving the problem of odor when turning on the air conditioner. At the same time, this case has a connecting branch pipe at both ends of the compressor. When the suction superheat is low, the branch can be opened to connect the two ends of the compressor directly, which can effectively increase the dryness of the main line and avoid problems such as liquid return in the compressor and incomplete evaporation of the refrigerant.

[0033] like Figure 1 and 2 As shown, an air conditioning triangle cycle thermal management system provided by the present invention includes a host system, a condensing system and a compression system. Among them, the host system, the condensing system and the compression system are respectively connected through pipelines, and a first electronic expansion valve is provided on the pipeline between the host system and the condensing system, and a second electronic expansion valve is provided on the pipeline between the host system and the compression system. At the same time, the two ends of the compression system are directly connected through pipelines to form a branch, and a third electronic expansion valve is provided on the branch. The first electronic expansion valve and the second electronic expansion valve are in a normally open state, and the third electronic expansion valve is in a normally closed state. The host system is an air conditioning host including an evaporator. When the automobile air conditioning triangle cycle thermal management system is working, the evaporator can dissipate heat, so that the condensed water on the inner wall of the air conditioning host shell and on the evaporator core evaporates to form water vapor. The air conditioning host also includes a blower, which can accelerate the circulation of air in the host system. The condensing system includes a condenser, which provides a condensing effect under refrigeration conditions and can condense the water vapor entering the condensing system into liquid water. In the present invention, there is no restriction on the type of condenser, which can be an air source condenser or a water condenser. The compression system includes a compressor and a suction superheat detection device, and the suction superheat detection device is installed in the compressor. The compressor provides heat to the evaporator and provides the refrigerant flow required by the refrigerant pipeline.

[0034] Furthermore, the input and output ends of the compression system are provided with a connecting pipeline, which forms a thermal management system branch. A third electronic expansion valve is provided on the thermal management system branch, and the third electronic expansion valve is in a normally closed state. When the thermal management system is working, the suction superheat detector in the compressor detects the suction superheat of the compressor in real time. The suction superheat detector is preset with a suction superheat threshold. When the suction superheat is too low, it may cause wet stroke and liquid hammer, etc., and may also cause problems such as low oil temperature and high viscosity, affecting the lubrication performance of the compressor. Therefore, in the present invention, a branch consisting of a third electronic expansion valve and a pipeline is designed to solve the problem of low suction superheat. When the suction superheat detection device detects that the suction superheat is lower than the preset suction superheat threshold, the third electric expansion valve changes from a normally closed state to an open state, and the two ends of the compressor are directly connected through the refrigerant pipeline. A branch is formed in parallel with the main pipeline of the thermal management system. When the branch is connected, the gas flowing through the compressor is diverted, reducing the gas flow rate of the main system pipeline, thereby increasing the suction superheat and the outlet dryness at the second electronic expansion valve. After opening the third electronic expansion valve, if the refrigerant pipeline temperature is still high, the output power of the compressor is increased, the suction temperature of the compressor is increased, the refrigerant at the compressor inlet is fully liquefied, and the long-term operation stability of the system is improved.

[0035] In one embodiment of the present invention, when the automobile air-conditioning triangle cycle thermal management system is working, the compressor is turned on first, and the compressor provides heat to the evaporator. The heat output by the evaporator acts on the side wall of the air-conditioning main unit and the inner core of the evaporator. The condensed water on the surface of the air-conditioning main unit and the inner core of the evaporator evaporates to form water vapor under the action of heat, and the gas circulation in the main unit system is accelerated by the blower, so that the water vapor is transported to the car cabin. When the suction superheat detection device in the compression system detects that the suction superheat is too low, the third electronic expansion valve is opened to connect the two ends of the compressor directly, and the gas flow of the main line is diverted.

[0036] The present invention also provides a thermal management method for a triangle cycle of an automobile air conditioner, comprising: S1: starting the compressor, the compressor provides heat to the evaporator, and the evaporator evaporates the condensed water on its surface to form water vapor; S2: starting the blower to supply air, and the blower accelerates the gas circulation in the host system; S3: an intake superheat detection device detects the intake superheat of the compressor, and when the intake superheat is lower than the intake superheat threshold, the third electronic expansion valve connected to both ends of the compressor is opened; S4: shutting down the operation of each device, and ending the triangle cycle thermal management process.

[0037] like Figure 1 and 3As shown, the evaporator is arranged in the air-conditioning main unit, and the air-conditioning main unit is connected to the compressor and the condenser through pipelines respectively. A temperature sensor is also arranged on the pipeline between the compression system and the condensing system. In S3, after the third electronic expansion valve is turned on, when the temperature sensor detects that the pipeline temperature is high, the suction temperature of the compressor increases. A first electronic expansion valve is arranged between the condenser and the air-conditioning main unit, and a second electronic expansion valve is arranged between the air-conditioning main unit. The first electronic expansion valve and the second electronic expansion valve are normally open. In S1, when the automobile air-conditioning triangle cycle thermal management system is working, the compressor delivers high-temperature and high-pressure refrigerant to the condenser. In the present invention, there is no restriction on the type of condenser, which can be an air source condenser or a water condenser. When the condenser is an air-cooled condenser, the condensing fan is not turned on at this time. The vehicle model with AGS can close the front air intake, and the condenser has no heat dissipation; if it is a water-cooled condenser, the condensing water pump is turned off. The refrigerant only passes through the condenser without any heat exchange, and then the refrigerant is intercepted by EXV1 to control the refrigerant pressure entering the evaporator so that the corresponding saturation temperature at this pressure is 10-20°C higher than the cabin temperature. The system releases heat. At this time, the evaporator acts as a condenser, and the compressor provides heat to the evaporator by delivering refrigerant to the evaporator. The heat output by the evaporator acts on the side wall of the air conditioner host and the inner core of the evaporator to dry the condensed water. In S2, the condensed water on the surface of the air conditioner host and the evaporator inner core evaporates to form water vapor under the action of heat, and the water vapor circulates rapidly in the host system under the action of the blower. In S3, the suction superheat of the compressor is detected by the suction superheat detection device. There is a suction superheat threshold in the detection device. When the detected suction superheat is lower than the preset suction superheat threshold, the third electronic expansion valve connected to both ends of the compressor is opened.

[0038] The present invention proposes a thermal management system and method for a delta cycle of an automobile air conditioner. By adding a branch connecting the two ends of a compressor, the compressor can open the branch when the suction superheat is low, which can effectively increase the dryness of the main circuit and improve the working stability of the system.

[0039] A car air-conditioning triangle cycle thermal management system and method of the present invention, when drying the condensed water on the evaporator surface during the triangle cycle, dynamically decides whether to open the hot gas bypass valve, i.e., the third electronic expansion valve, according to the feedback of the suction superheat; when monitoring that the compressor suction superheat is insufficient, open EXV3 to divert the compressor exhaust mass flow, so that the EXV3 loop and the main system loop are in parallel relationship, reducing the flow of part of the main system loop, and increasing the EXV2 outlet dryness; at the same time, after being intercepted by EXV3, the refrigerant temperature is still relatively high, which can increase the compressor suction temperature, ensure that the compressor inlet refrigerant is fully gasified, and improve the long-term operation stability of the system.

[0040] Therefore, the problem of odor in the air conditioner can be solved by using an automobile air conditioner triangular cycle thermal management system and method of the present invention.

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A triangular cycle thermal management system for automobile air conditioning, characterized in that: include: A host system, the host system comprising an air conditioning host including an evaporator, the evaporator evaporating condensed water in the host system into water vapor; A condensation system, wherein the condensation system comprises a condenser, and one end of the condensation system is connected to the host system through a pipeline; A compression system, the compression system comprising a compressor, the compression system being connected to the host system and the condensing system through pipelines, respectively, and the compressor providing heat to the evaporator; Among them, a first electronic expansion valve is provided between the host system and the condensing system, a second electronic expansion valve is provided between the host system and the compression system, and the two ends of the compression system are connected through a third electronic expansion valve. When the third electronic expansion valve is opened, the two ends of the compression system are directly connected.

2. The automotive air conditioning triangular cycle thermal management system according to claim 1, characterized in that: The host system also includes a blower, which performs work on the water vapor in the host system to transport the water vapor into the car cabin.

3. The automotive air conditioning delta cycle thermal management system according to claim 1, characterized in that: The compression system further comprises a suction superheat detection device, which detects the suction superheat of the compressor.

4. The automotive air conditioning delta cycle thermal management system according to claim 3, characterized in that: The intake air superheat detection device is preset with an intake air superheat threshold. When the intake air superheat detected by the intake air superheat detection device is higher than the intake air superheat threshold, the thermal management system operates normally and the third electronic expansion valve is closed.

5. The automotive air conditioning delta cycle thermal management system according to claim 4, characterized in that: When the intake air superheat detected by the intake air superheat detection device is lower than the intake air superheat threshold, the third electronic expansion valve opens.

6. The automotive air conditioning delta cycle thermal management system according to claim 1, characterized in that: A temperature sensor is also provided on the pipeline. When the temperature sensor detects that the temperature of the pipeline between the compression system and the condensation system is high, the compressor increases the operating power to increase the suction temperature of the compressor.

7. A thermal management method for a triangular cycle of an automobile air conditioner, characterized in that: include: S1: Turn on the compressor, the compressor provides heat to the evaporator, and the evaporator evaporates the condensed water on its surface to form water vapor; S2: Turn on the blower to blow air, and the blower blows the water vapor from the evaporator to the car cabin; S3: The suction superheat detection device detects the suction superheat of the compressor. When the suction superheat is lower than the suction superheat threshold, the third electronic expansion valve connected to both ends of the compressor is opened; S4: Shut down the operation of each device and end the triangle cycle thermal management process.

8. The automotive air conditioning triangle cycle thermal management method according to claim 7, characterized in that: The evaporator is arranged in an air-conditioning main unit, and the air-conditioning main unit is connected with the compressor and the condenser through pipelines respectively.

9. The automotive air conditioning triangle cycle thermal management method according to claim 7, characterized in that: A temperature sensor is also provided on the pipeline between the compression system and the condensation system. In S3, after the third electronic expansion valve is opened, when the temperature sensor detects that the pipeline temperature is high, the suction temperature of the compressor increases.

10. The automotive air conditioning triangle cycle thermal management method according to claim 8, characterized in that: A first electronic expansion valve is provided between the condenser and the air conditioner host, and a second electronic expansion valve is provided between the air conditioner host and the compressor. The first electronic expansion valve and the second electronic expansion valve are in a normally open state.

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