System and method for improving adaptation capacity of compressor in air conditioning system

Abstract

The system comprises a compressor, an outlet of the compressor is divided into two paths which are sequentially connected with a condenser, an evaporator and an inlet of a liquid storage cylinder of the compressor, the other path is divided into two sub-paths, the first sub-path surrounds the outer wall of the compressor and then is connected with an inlet of the condenser, and the second sub-path is connected with an outlet of the liquid storage cylinder of the compressor. The second sub-path surrounds the outer wall of the liquid storage cylinder of the compressor and then is connected with an inlet of the condenser; an outlet of the condenser is divided into two paths, one path surrounds the outer wall of the compressor liquid storage cylinder and then is connected with an inlet of the evaporator, and the other path is sequentially connected with the evaporator and the inlet of the compressor liquid storage cylinder. According to the method, the temperature of an oil pool is increased under the low-frequency refrigeration working condition, the supercooling degree of a refrigerant at an outlet of a condenser is increased under the rated refrigeration working condition, and the capacity of the compressor suitable for the heat pump air conditioning system under the low-temperature heating working condition is improved.

Description

Technical Field

[0001] This invention belongs to the field of refrigeration and air conditioning compressor technology, and relates to a system and method for improving the compatibility of compressors in air conditioning systems. Background Technology

[0002] Currently, most domestically sold household air conditioners and North American window air conditioners have adopted inverter technology. According to the APF (Advanced Performance Factor) standard for domestically sold air conditioners or the CEER (Central Energy Efficiency Ratio) standard for North American window air conditioners, the performance of domestically sold inverter air conditioners under low-temperature intermediate operating conditions accounts for nearly 26% of the APF energy efficiency, while the performance of North American inverter window air conditioners under T3 / T4 operating conditions accounts for 72% of the CEER. Therefore, based on the existing air conditioning system configuration and cost, it is necessary to focus on solving and improving the compressor's capacity and energy efficiency under low-temperature operating conditions. Secondly, to improve system performance, current household air conditioners often use larger heat exchangers... While heat transfer can be enhanced by increasing the surface area of ​​the hot zone or increasing the fan speed, the temperature drop of the refrigerant at the condenser outlet is limited due to system costs and the ambient temperature of the air conditioner. The subcooling of the refrigerant at the condenser outlet remains at a certain level, affecting the compressor's performance within the system. Furthermore, when household air conditioners operate in low-temperature heating conditions, the compressor return gas temperature is typically lower than the air dew point temperature, causing frost to form on the surface of the compressor's liquid receiver. This reduces heat exchange between the refrigerant inside the receiver and the external environment, impacting the compressor's performance and user experience under low-temperature heating conditions, leading to customer complaints.

[0003] Problems with existing technology: Under low-temperature operating conditions in air conditioning, the compressor operates at a low frequency (generally within the range of 10-35Hz), resulting in a small pressure difference and pressure ratio. This leads to low compressor discharge temperature and oil sump temperature. Consequently, a large amount of liquid refrigerant and lubricating oil become miscible in the oil sump at the bottom of the compressor. The liquid refrigerant cannot evaporate and participate in the refrigeration system circulation, causing a reduction in the effective circulation flow of the refrigerant in the system. This directly affects the compressor's performance under low-frequency operating conditions and, consequently, the energy efficiency of the air conditioning system. Under rated cooling conditions, to improve the compressor's performance in existing air conditioning systems, it is usually necessary to lower the refrigerant temperature at the condenser outlet and increase the condenser subcooling. This requires increasing the heat exchange area of ​​the condenser, resulting in higher system costs and impacting product competitiveness. Furthermore, due to limitations imposed by ambient temperature and heat exchange temperature difference, the refrigerant temperature at the condenser outlet cannot be lower than the ambient temperature, restricting the increase in condenser subcooling and thus affecting the compressor's performance, ultimately impacting the overall air conditioning system performance.

[0004] Under low-temperature heating conditions, the compressor operates at a higher frequency (generally within the range of 100-130Hz), resulting in a large pressure difference and pressure ratio. The refrigerant inside the compressor's receiver is in a low-temperature and low-pressure state. When the compressor's return gas temperature is lower than the air dew point temperature, frost will form on the surface of the compressor's receiver, affecting the heat exchange between the refrigerant inside the receiver and the external ambient temperature, thus affecting the compressor's performance under this condition. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art where, under different operating conditions, the oil sump temperature is too low, the rated cooling subcooling bottleneck occurs, and the liquid receiver in low-temperature heating frosts, which limit the full utilization of compressor capacity and system energy efficiency. The invention provides a system or method to improve the compressor adaptability in air conditioning systems.

[0006] To achieve the above objectives, the present invention employs the following technical solution: A system for improving the compatibility of a compressor in an air conditioning system includes a compressor. The compressor outlet is divided into two paths, which are sequentially connected to the inlet of a condenser, an evaporator, and a compressor receiver. The other path is divided into two sub-paths. The first sub-path surrounds the outer wall of the compressor and then connects to the condenser inlet. The second sub-path surrounds the outer wall of the compressor receiver and then connects to the condenser inlet. The condenser outlet is divided into two paths: one path surrounds the outer wall of the compressor liquid receiver and connects to the inlet of the evaporator; the other path connects to the inlets of the evaporator and the compressor liquid receiver in sequence. The compressor's liquid storage tank is connected to the compressor.

[0007] A further improvement of the present invention is that: A first three-way valve is installed at the outlet of the compressor.

[0008] A sixth three-way valve is installed on another path of the compressor outlet. One path of the outlet of the sixth three-way valve is connected to the first sub-path, and the other path is connected to the second sub-path.

[0009] The first sub-path is wound around the outer wall at the bottom of the compressor, corresponding to the oil sump.

[0010] A fifth three-way valve is installed at the junction of the first sub-path and the second sub-path, and the outlet of the fifth three-way valve is connected to the condenser inlet.

[0011] A second three-way valve is installed between the outlet of the fifth three-way valve and the inlet of the condenser.

[0012] The outlet of the condenser is sequentially equipped with a third three-way valve and a fourth three-way valve; The condenser outlet is divided into two paths. One path goes through the third three-way valve and then around to the outer wall of the compressor's liquid receiver, and then through the fourth three-way valve and connects to the evaporator inlet.

[0013] The pipes surrounding the outer wall of the compressor's liquid receiver are all located at the bottom of the compressor's liquid receiver.

[0014] A throttling mechanism is provided between the outlet of the condenser and the inlet of the evaporator.

[0015] A method for improving the compressor adaptability in an air conditioning system based on the system described in this invention includes the following steps: When the air conditioning system is in a low-frequency cooling operation, the high-temperature and high-pressure gas at the compressor outlet is divided into two paths. One path goes through the first sub-path to the outer wall of the compressor, where it exchanges heat with the mixture of lubricating oil and liquid refrigerant in the oil sump at the bottom of the compressor housing before entering the main circuit. After merging with the refrigerant in the main circuit, it enters the condenser for heat exchange, and then passes through the condenser, evaporator and compressor receiver in sequence before returning to the compressor. When the air conditioning system is in cooling operation, the liquid refrigerant at the condenser outlet is divided into two paths. One path goes around to the outer wall of the compressor receiver tank and exchanges heat with the low-temperature, low-pressure refrigerant inside the compressor receiver tank. The low-temperature, low-pressure refrigerant inside the compressor receiver tank is vaporized and absorbs heat. When the temperature of the liquid refrigerant surrounding the outer wall of the compressor receiver tank is lower than the ambient temperature, the liquid refrigerant is sequentially delivered to the evaporator and the inlet of the compressor receiver tank. When the air conditioning system is in low-temperature heating operation, the high-temperature and high-pressure gas from the compressor outlet is routed along the second sub-path to the outer wall of the compressor receiver. The high-temperature and high-pressure gas exchanges heat with the low-temperature and low-pressure refrigerant inside the compressor receiver. The low-temperature and low-pressure refrigerant inside the compressor receiver vaporizes and absorbs heat. After heat exchange, the gaseous refrigerant passes through the condenser, evaporator and compressor receiver in sequence before returning to the compressor.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a system for improving the adaptability of compressors in air conditioning systems. The compressor outlet is divided into two paths. During low-frequency cooling operation, the first path surrounds the outer wall of the compressor and connects to the condenser inlet. When the air conditioning system is in low-frequency cooling operation mode, a portion of the high-temperature, high-pressure gas from the compressor discharge port is diverted through the first path to the oil sump at the bottom of the compressor. This allows the high-temperature, high-pressure gas to fully exchange heat with the mixture of lubricating oil and liquid refrigerant in the oil sump at the bottom of the compressor housing, increasing the temperature of the compressor oil sump and reducing the solubility of the liquid refrigerant in the lubricating oil, causing it to evaporate and participate in the refrigeration cycle. This improves the effective refrigerant circulation flow rate of the compressor under low-temperature refrigeration conditions, and also increases the viscosity of the lubricating oil. While ensuring the lubrication and sealing of the pump body, this enhances the reliability of the compressor. The gaseous refrigerant, after heat exchange and cooling, returns to the main circuit for refrigeration circulation. When the air conditioning system is in refrigeration mode, the condenser outlet splits into two paths. A portion of the room-temperature, high-pressure liquid refrigerant flows out of the condenser outlet and is introduced into the lower part of the compressor's receiver tank. This allows for sufficient heat exchange between the room-temperature, high-pressure liquid refrigerant and the gas-liquid two-phase low-temperature, low-pressure refrigerant in the lower part of the compressor's receiver tank. The two-phase refrigerant in the compressor absorbs heat through vaporization. The liquid, room-temperature, high-pressure refrigerant in the branch circuit, which is wrapped around or tightly attached to the lower part of the receiver tank, continues to cool to below the ambient temperature of the air conditioning system before entering the main circuit before the throttling mechanism. This merges the liquid, room-temperature, high-pressure refrigerant, increasing the refrigerant subcooling of the refrigeration cycle by making the temperature of the merged refrigerant lower than the ambient temperature of the air conditioning system. When the air conditioning system is in low-temperature heating mode, a portion of the high-temperature, high-pressure gas is diverted from the second branch circuit and introduced into the lower part of the compressor receiver tank, allowing the high-temperature, high-pressure gas to fully react with the gas-liquid two-phase low-temperature, low-pressure refrigerant in the lower part of the compressor receiver tank. Heat exchange occurs through the vaporization and heat absorption of the two-phase refrigerant in the receiver tank, raising the compressor return gas temperature above the air dew point temperature. This ensures the surface of the compressor receiver tank remains frost-free, enhancing the heat exchange between the refrigerant and the outside environment and improving low-temperature heating capacity. Simultaneously, it ensures the refrigerant in the compressor receiver tank enters the compressor pump body in a gaseous state, preventing the intake of liquid refrigerant and causing compressor liquid slugging. The control system disclosed in this invention can adapt to the current ambient temperature requirements by switching the pipeline delivery lines under different operating conditions, improving the compressor adaptability in the air conditioning system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a system structure diagram of the present invention.

[0019] Wherein: 1-compressor; 2-condenser; 3-evaporator; 4-compressor receiver; 5-first sub-circuit; 6-second sub-circuit; 7-first three-way valve; 8-sixth three-way valve; 9-fifth three-way valve; 10-second three-way valve; 11-third three-way valve; 12-fourth three-way valve; 13-throttling mechanism. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 This invention discloses a system for improving the adaptability of compressors in air conditioning systems. By optimizing the cooling and heating circulation paths of the air conditioning system, the system can improve the capacity and energy efficiency of the air conditioning system based on the existing configuration, providing technical support for cost reduction of the air conditioning system.

[0027] To address the issue of low compressor oil sump temperature under low-temperature rated operating conditions in the refrigeration cycle, a method of diverting the gas from the compressor discharge port is adopted. This method allows a portion of the high-temperature, high-pressure gas to undergo sufficient heat exchange with the low-temperature mixture of lubricating oil and liquid refrigerant in the compressor's bottom oil sump. This heats the oil sump, causing the liquid refrigerant dissolved in the lubricating oil to fully evaporate into gaseous refrigerant before participating in the refrigeration cycle. This improves the effective refrigerant circulation flow rate of the system, thereby addressing the compressor's capacity under low-frequency refrigeration conditions and enhancing the energy efficiency of both the compressor and the system. Simultaneously, it increases the viscosity of the lubricating oil in the compressor's bottom oil sump, ensuring pump lubrication and sealing while improving compressor reliability.

[0028] To address the issue of compressor capacity utilization under rated refrigeration conditions in refrigeration cycles, this invention optimizes the existing refrigeration cycle process. Using existing air conditioning configuration systems, without increasing heat exchanger costs, it employs a diversion method from the condenser outlet. A portion of the cooled, high-pressure, ambient-temperature liquid refrigerant, having passed through the condenser, is introduced onto the surface of the compressor's liquid receiver via winding or close contact. This allows for thorough heat exchange with the low-temperature, two-phase refrigerant within the receiver, increasing the compressor's return gas temperature and further recooling the refrigerant at the condenser outlet. This continuously lowers the refrigerant temperature at the condenser outlet, overcoming the influence of ambient temperature on heat exchange and increasing the refrigerant subcooling at the condenser outlet. Ultimately, this enhances the compressor's overall refrigeration capacity within the system.

[0029] To address the issue of compressor capacity under low-temperature heating conditions in the heating cycle, this invention optimizes the existing heating cycle process without increasing heat exchanger costs, using an existing air conditioning configuration system. It employs a diversion method from the compressor exhaust port, allowing a portion of the high-temperature, high-pressure gas to fully exchange heat with the two-phase low-temperature, low-pressure refrigerant in the compressor's receiver. The two-phase refrigerant in the receiver vaporizes and absorbs heat, raising the compressor's return gas temperature and ensuring the surface temperature of the receiver rises above the dew point, preventing frost formation. This enhances the heat exchange between the refrigerant and the external environment, thereby improving low-temperature heating capacity. Simultaneously, it ensures the refrigerant enters the compressor pump body in a gaseous state, preventing the pump from drawing in liquid refrigerant and causing compressor liquid slugging.

[0030] Specifically, it includes: See Figure 1 A system for improving the compatibility of compressors in an air conditioning system includes a compressor 1. The outlet of the compressor 1 is divided into two paths, which are connected in sequence to the inlet of the condenser 2, the evaporator 3 and the compressor liquid receiver 4. The other path is divided into two sub-paths. The first sub-path 5 surrounds the outer wall of the compressor 1 and then connects to the inlet of the condenser 2. The second sub-path 6 surrounds the outer wall of the compressor liquid receiver and then connects to the inlet of the condenser 2. The outlet of the condenser 2 is divided into two paths. One path surrounds the outer wall of the compressor liquid storage tank and connects to the inlet of the evaporator 3. The other path connects to the inlet of the evaporator 3 and the compressor liquid storage tank 4 in sequence. The compressor liquid storage tank 4 is connected to the compressor 1.

[0031] Furthermore, in this embodiment, a first three-way valve 7 is provided at the outlet of compressor 1, and a sixth three-way valve 8 is provided on the other path of the outlet of compressor 1. One path of the outlet of the sixth three-way valve 8 is connected to the first sub-path 5, and the other path is connected to the second sub-path 6.

[0032] Furthermore, in this embodiment, a fifth three-way valve 9 is provided at the junction of the first sub-path 5 and the second sub-path 6. The outlet of the fifth three-way valve 9 is connected to the inlet of the condenser 2, and a second three-way valve 10 is provided between the outlet of the fifth three-way valve 9 and the inlet of the condenser 2.

[0033] Furthermore, in this embodiment, the outlet of the condenser 2 is sequentially provided with a third three-way valve 11 and a fourth three-way valve 12; the outlet of the condenser 2 is divided into two paths, one of which passes through the third three-way valve 11 and then surrounds the outer wall of the compressor liquid storage tank, and then passes through the fourth three-way valve 12 and connects to the inlet of the evaporator 3.

[0034] Furthermore, in this embodiment, the pipelines surrounding the outer wall of the compressor's liquid receiver are all located at the lower part of the compressor's liquid receiver.

[0035] Furthermore, in this embodiment, a throttling mechanism 13 is provided between the outlet of the annular condenser 2 and the inlet of the evaporator 3.

[0036] This embodiment also discloses a method for improving the compatibility of a compressor in an air conditioning system, including the following steps: Specifically, it includes three working conditions: First working condition: In the low-frequency operation mode of the air conditioning system, a portion of high-temperature and high-pressure gas is diverted from the discharge port of compressor 1 through the first three-way valve 7 and the sixth three-way valve 8 (used to control the temperature of the compressor oil sump after heating). This portion of high-temperature and high-pressure refrigerant is then wound or pressed tightly against the oil sump at the bottom of compressor 1, allowing the high-temperature and high-pressure gas to fully exchange heat with the mixture of lubricating oil and liquid refrigerant in the oil sump at the bottom of the compressor housing. This increases the temperature of the compressor oil sump, reduces the solubility of the liquid refrigerant in the lubricating oil, and allows it to evaporate and participate in the refrigeration cycle. This improves the effective refrigerant circulation flow rate of the compressor under low-temperature refrigeration conditions. At the same time, it can increase the viscosity of the lubricating oil, thereby improving the reliability of the compressor while ensuring the lubrication and sealing of the pump body.

[0037] Furthermore, the gaseous refrigerant in the branch circuit, after heat exchange and cooling, sequentially passes through the fifth three-way valve 9 and the second three-way valve 10 to merge with the main circuit refrigerant before entering the condenser 2. After entering the condenser 2 for heat exchange, the system refrigerant is throttled and depressurized through the throttling mechanism 13, enters the evaporator 3 for evaporation and heat absorption, and then enters the compressor 1 to complete the entire refrigeration cycle.

[0038] Second operating condition: The refrigerant temperature at the condenser outlet in the refrigeration cycle is reduced by optimizing the air conditioning refrigeration system process. Specifically: In the air conditioning system's cooling operation mode, a portion of ambient temperature high-pressure liquid refrigerant is diverted from the condenser 2 outlet through the third three-way valve 11 (to control the temperature of the refrigerant after heating in the compressor receiver and the outlet temperature of the branch refrigerant). This liquid refrigerant branch is then introduced into the lower part of the compressor receiver 4 via a pipe winding or tightly fitted method. This allows for sufficient heat exchange between the ambient temperature high-pressure liquid refrigerant and the low-temperature, low-pressure two-phase refrigerant in the lower part of the compressor receiver 4. The two-phase refrigerant in the compressor receiver 4 is vaporized and absorbs heat. The liquid refrigerant at room temperature and high pressure attached to the lower part of the compressor receiver 4 continues to be cooled to below the ambient temperature of the air conditioning system. Then, it passes through the fourth three-way valve 12 and merges with the liquid refrigerant at room temperature and high pressure in the main circuit before entering the throttling mechanism. This makes the temperature of the merged refrigerant lower than the ambient temperature of the air conditioning system, thereby increasing the refrigerant subcooling of the refrigeration cycle. Subsequently, it enters the throttling mechanism to reduce the pressure of the system's room temperature and high pressure liquid refrigerant to a low temperature and low pressure liquid refrigerant, which then enters the evaporator 3 for evaporation and heat absorption. Finally, it enters the compressor 1 to complete the refrigeration cycle.

[0039] The third operating condition: The low-temperature heating capacity of the compressor can be improved through process optimization. Specifically: In the low-temperature heating mode of the air conditioning system, a portion of high-temperature, high-pressure gas is diverted from the compressor 1 discharge port through the first three-way valve 7 and the sixth three-way valve 8 (to control the temperature of the refrigerant in the compressor receiver after heating, ensuring that the surface temperature of the receiver is not lower than the air dew point temperature). Then, the refrigerant diversion branch pipe is introduced into the lower part of the compressor receiver 4 by winding or tightly wrapping, so that the high-temperature, high-pressure gas and the gas-liquid two-phase low-temperature, low-pressure refrigerant in the lower part of the compressor receiver 4 can fully exchange heat. The two-phase refrigerant in the compressor receiver 4 vaporizes and absorbs heat, and the compressor return gas temperature is raised to above the air dew point temperature, ensuring that the surface of the compressor receiver 4 is in a non-frost state. This enhances the heat exchange between the refrigerant in the receiver and the outside, thereby improving the low-temperature heating capacity. At the same time, it ensures that the refrigerant in the compressor receiver enters the compressor pump body in a gaseous state, preventing the compressor pump body from sucking in liquid refrigerant and causing compressor liquid slugging failure.

[0040] Furthermore, the gaseous refrigerant after heat exchange passes through the fifth three-way valve 9 and the second three-way valve 10 in sequence to merge with the main circuit refrigerant entering the condenser 2, where it undergoes heat exchange. Then, after the system refrigerant is throttled and depressurized by the throttling mechanism 13, it enters the evaporator 3 for evaporation and heat absorption, and then enters the compressor 1 to complete the heating cycle.

[0041] The present invention provides a method for improving the adaptability of an air conditioning system compressor, applicable to current refrigeration refrigerants (R32, R290, R454B, R454C, R410A, and R404A, etc.), a method for increasing the oil sump temperature under low-frequency refrigeration conditions, a method for increasing the refrigerant subcooling at the condenser outlet under rated refrigeration conditions, and a method for improving the compressor capacity of a heat pump air conditioning system under low-temperature heating conditions.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A system for improving the compatibility of compressors in air conditioning systems, characterized in that, Includes a compressor (1), the outlet of the compressor (1) is divided into two paths, which are connected in sequence to the inlet of the condenser (2), the evaporator (3) and the compressor liquid storage tank (4), and the other path is connected to two sub-paths. The first sub-path (5) surrounds the outer wall of the compressor (1) and then connects to the inlet of the condenser (2), and the second sub-path (6) surrounds the outer wall of the compressor liquid storage tank and then connects to the inlet of the condenser (2). The outlet of the condenser (2) is divided into two paths. One path surrounds the outer wall of the compressor liquid storage tank and connects to the inlet of the evaporator (3). The other path connects to the inlet of the evaporator (3) and the compressor liquid storage tank (4) in sequence. The compressor's liquid storage tank (4) is connected to the compressor (1).

2. The system for improving the compressor adaptability in an air conditioning system according to claim 1, characterized in that, A first three-way valve (7) is provided at the outlet of the compressor (1).

3. The system for improving the compressor adaptability in an air conditioning system according to claim 1, characterized in that, A sixth three-way valve (8) is provided on the other side of the compressor (1) outlet. One outlet of the sixth three-way valve (8) is connected to the first sub-path (5), and the other outlet is connected to the second sub-path (6).

4. The system for improving the compressor adaptability in an air conditioning system according to claim 1, characterized in that, The first sub-path (5) is wound around the outer wall of the compressor (1) at the bottom, corresponding to the oil sump.

5. The system for improving the compressor adaptability in an air conditioning system according to claim 1, characterized in that, A fifth three-way valve (9) is provided at the junction of the first sub-path (5) and the second sub-path (6), and the outlet of the fifth three-way valve (9) is connected to the inlet of the condenser (2).

6. The system for improving the compressor adaptability in an air conditioning system according to claim 5, characterized in that, A second three-way valve (10) is provided between the outlet of the fifth three-way valve (9) and the inlet of the condenser (2).

7. The system for improving the compressor adaptability in an air conditioning system according to claim 1, characterized in that, The outlet of the condenser (2) is provided with a third three-way valve (11) and a fourth three-way valve (12) in sequence. The outlet of the condenser (2) is divided into two paths. One path goes through the third three-way valve (11) and then around to the outer wall of the compressor's liquid storage tank. Then it goes through the fourth three-way valve (12) and connects to the inlet of the evaporator (3).

8. The system for improving the compressor adaptability in an air conditioning system according to claim 1, characterized in that, The pipes surrounding the outer wall of the compressor's liquid receiver are all located at the bottom of the compressor's liquid receiver.

9. The system for improving the compressor adaptability in an air conditioning system according to claim 1, characterized in that, A throttling mechanism (13) is provided between the outlet of the condenser (2) and the inlet of the evaporator (3).

10. A method for improving the compressor adaptability in an air conditioning system based on the system described in claim 1, characterized in that, Includes the following steps: When the air conditioning system is in the low-frequency cooling operation condition, the high-temperature and high-pressure gas at the outlet of the compressor (1) is divided into two paths. One path goes through the first sub-path (5) to the outer wall of the compressor (1), exchanges heat with the mixture of lubricating oil and liquid refrigerant in the oil sump at the bottom of the compressor (1) housing, and then enters the main circuit. After merging with the refrigerant in the main circuit, it enters the condenser (2) for heat exchange, and then passes through the condenser (2), evaporator (3) and compressor liquid receiver (4) in sequence before returning to the compressor (11). When the air conditioning system is in cooling operation, the liquid refrigerant at the outlet of the condenser (2) is divided into two paths. One path goes around to the outer wall of the compressor receiver tank and exchanges heat with the low-temperature and low-pressure refrigerant inside the compressor receiver tank. The low-temperature and low-pressure refrigerant inside the compressor receiver tank is vaporized and absorbs heat. When the temperature of the liquid refrigerant surrounding the outer wall of the compressor receiver tank is lower than the ambient temperature, the liquid refrigerant is sequentially transported to the inlet of the evaporator (3) and the compressor receiver tank (4). When the air conditioning system is in low temperature heating operation, the high temperature and high pressure gas at the outlet of the compressor (1) is routed along the second sub-path (6) to the outer wall of the compressor receiver. The high temperature and high pressure gas exchanges heat with the low temperature and low pressure refrigerant inside the compressor receiver. The low temperature and low pressure refrigerant inside the compressor receiver vaporizes and absorbs heat. After heat exchange, the gaseous refrigerant passes through the condenser (2), evaporator (3) and compressor receiver (4) in sequence before returning to the compressor (11).

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