Air conditioning system

Abstract

The application provides an air conditioning system, which comprises a compressor, a condenser, a first throttling part, a flash evaporator, a first distributor, a first evaporator, a second evaporator and a circulating flow path; the compressor comprises a shell and a first cylinder and a second cylinder arranged in the shell; the outlet of the first cylinder and the outlet of the second cylinder are communicated with a cavity in the shell; the two ends of the first throttling part are communicated with the inlet of the flash evaporator and the condenser respectively; when the air conditioning system is in a refrigeration mode, the cavity of the shell is communicated with the condenser, the gas phase outlet of the flash evaporator is communicated with the first distributor, the liquid phase outlet of the flash evaporator is communicated with the inlet of the first evaporator and the inlet of the second evaporator, the outlet of the first evaporator is communicated with the first distributor, the outlet of the second evaporator is communicated with the inlet of the second cylinder, and the first distributor is communicated with the inlet of the first cylinder; the technical scheme provided by the application can improve the energy efficiency of the existing air conditioning system.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and more specifically, to an air conditioning system. Background Technology

[0002] Energy conservation and emission reduction are among the core tasks of the energy industry. As a high-energy-consuming industry, the air conditioning industry has an urgent need for high-efficiency and energy-saving products. The work of improving the efficiency of air conditioning products can be carried out from two directions: optimizing the system circulation mode and optimizing the efficiency of air conditioning system components.

[0003] Patent document CN105115181B proposes a dual-evaporation temperature system, in which two high- and low-temperature evaporators are arranged in the heat exchange channel respectively. The indoor return air passes through the high- and low-temperature evaporators for heat exchange. At the same time, the outlets of the two evaporators are connected to the two independent compression cylinders of the compressor, thereby ensuring that the evaporation temperature of the high-temperature evaporator is higher than that of the conventional system, which improves the system energy efficiency to a certain extent. However, compared with the complexity of the system, the improvement in energy efficiency is relatively small, and further performance improvements are needed. Summary of the Invention

[0004] This invention provides an air conditioning system to improve the energy efficiency of existing air conditioning systems.

[0005] To address the aforementioned problems, this invention provides an air conditioning system comprising a compressor, a condenser, a first throttling section, a flash evaporator, a first liquid distributor, a first evaporator, and a second evaporator forming a circulating flow path; the compressor includes a housing and a first cylinder and a second cylinder disposed within the housing, the outlets of the first cylinder and the second cylinder being connected to a cavity within the housing, and the two ends of the first throttling section being connected to the inlet of the flash evaporator and the condenser, respectively; when the air conditioning system is in cooling mode, the cavity of the housing is connected to the condenser, the vapor phase outlet of the flash evaporator is connected to the first liquid distributor, the liquid phase outlet of the flash evaporator is connected to the inlet of both the first evaporator and the second evaporator, the outlet of the first evaporator is connected to the first liquid distributor, the outlet of the second evaporator is connected to the inlet of the second cylinder, and the first liquid distributor is connected to the inlet of the first cylinder.

[0006] Furthermore, the first separator has a first inlet, a second inlet, and a first outlet. The gas phase outlet of the flash evaporator is connected to the first outlet of the first separator, the outlet of the first evaporator is connected to the second inlet of the first separator, and the first outlet is connected to the first cylinder.

[0007] Furthermore, the cavity of the first distributor includes a first liquid phase zone and a first gas phase zone. The first gas phase zone is located above the first liquid phase zone. A first inlet and a second inlet are located at the top of the first distributor and communicate with the first gas phase zone. A first outlet is located at the bottom of the first distributor and communicates with the first liquid phase zone. One end of the pipe connecting the first distributor and the flash evaporator passes through the first inlet from above the first distributor and communicates with the first gas phase zone. One end of the pipe connecting the first distributor and the first evaporator passes through the second inlet from above the first distributor and communicates with the first gas phase zone. One end of the pipe connecting the first distributor and the first cylinder passes through the first outlet from below the first distributor and communicates with the first gas phase zone.

[0008] Furthermore, the air conditioning system also includes a second distributor, which has a third inlet and a second outlet. The outlet of the second evaporator is connected to the third inlet, and the inlet and the second outlet of the second cylinder are connected.

[0009] Furthermore, the cavity of the second separator includes a second liquid phase zone and a second gas phase zone, with the second gas phase zone located above the second liquid phase zone. A third inlet is located at the top of the second separator and communicates with the second gas phase zone, and a second outlet is located at the bottom of the second separator and communicates with the second liquid phase zone. One end of the pipe connecting the second separator and the second evaporator passes through the third inlet from the top of the second separator and communicates with the second gas phase zone, while one end of the pipe connecting the second separator and the second cylinder passes through the second outlet from the bottom of the second separator and communicates with the second gas phase zone.

[0010] Furthermore, the air conditioning system also includes a second throttling section, which is located on the pipe connecting the liquid phase outlet of the flash evaporator and the inlet of the second evaporator.

[0011] Furthermore, both the first and second throttling sections are capillary tubes. When the air conditioning system is in cooling mode, the first throttling section is used to convert the low-temperature, high-pressure gas output from the condenser into a low-temperature, medium-pressure gas, and the second throttling section is used to convert the low-temperature, medium-pressure liquid output from the flash evaporator into a low-temperature, low-pressure liquid.

[0012] Furthermore, the air conditioning system also includes a one-way valve, which is installed on the pipeline connecting the vapor phase outlet of the flash evaporator and the first inlet of the first distributor.

[0013] Furthermore, the compressor also includes an upper flange, a lower flange, and a partition, with the upper flange, the first cylinder, the partition, the second cylinder, and the lower flange stacked sequentially inside the housing from top to bottom.

[0014] Furthermore, both the upper flange and the lower flange have a connecting cavity. The connecting cavity of the upper flange is connected to the first cylinder, and the connecting cavity of the lower flange is connected to the second cylinder and the connecting cavity of the upper flange, respectively. The connecting cavity of the upper flange is connected to the first cylinder. Above the connecting cavity of the upper flange is a flow port that is connected to the cavity of the outer shell. The gas in the first cylinder and the second cylinder flows into the connecting cavity of the upper flange and is discharged.

[0015] The present invention provides an air conditioning system comprising a compressor, a condenser, a first throttling section, a flash evaporator, a first liquid distributor, a first evaporator, and a second evaporator forming a circulating flow path. The compressor includes a housing and a first cylinder and a second cylinder disposed within the housing. The outlets of the first cylinder and the second cylinder are connected to a cavity within the housing. The two ends of the first throttling section are connected to the inlet of the flash evaporator and the condenser, respectively. When the air conditioning system is in cooling mode, the cavity of the housing is connected to the condenser, the vapor phase outlet of the flash evaporator is connected to the first liquid distributor, the liquid phase outlet of the flash evaporator is connected to the inlet of both the first evaporator and the second evaporator, the outlet of the first evaporator is connected to the first liquid distributor, the outlet of the second evaporator is connected to the inlet of the second cylinder, and the first liquid distributor is connected to the inlet of the first cylinder.

[0016] In this design, the flash evaporator's output flow path is divided into two paths. One path directly enters the first evaporator (high-temperature evaporator) for heat absorption and evaporation, while the other path, after throttling and pressure reduction, enters the second evaporator (low-temperature evaporator). The medium-pressure refrigerant output from the first evaporator is drawn into the first cylinder (high-pressure cylinder) as suction gas, compressed to high pressure, and discharged from the compressor. Similarly, the low-pressure refrigerant output from the second evaporator is drawn into the second cylinder (low-pressure cylinder) as suction gas, compressed to high pressure, and discharged from the compressor. The two refrigerant paths are compressed independently. The low-temperature gaseous fluid output from the flash evaporator merges with the high-temperature gaseous fluid output from the first evaporator, and together they are drawn into the first cylinder as suction gas, compressed to high pressure, and discharged from the compressor. By configuring the flash evaporator's gas path and using the first cylinder to compress the flash evaporator's output gas phase from medium pressure to high pressure, this function can be achieved without constructing a new compression mechanism (constructing a new mechanism would add a new cylinder, making the entire compressor structure complex, increasing energy consumption, and raising the difficulty of component processing and assembly). This reduces energy loss and improves energy efficiency. By setting up a first distributor (high-pressure distributor), the high-temperature gas phase fluid output by the flash evaporator is cooled by the high-temperature gas phase fluid output by the first evaporator. Compared with the ordinary dual-evaporation temperature cycle system, this can improve the power consumption loss due to overheating of the first cylinder. At the same time, the gas replenishment by the flash evaporator effectively increases the cooling capacity of the air conditioning system and improves the performance of the air conditioning system. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of an air conditioning system provided in an embodiment of the present invention is shown;

[0019] Figure 2 The diagram shows the improvement in energy efficiency ratio of the air conditioning system provided by the present invention compared to the existing single-stage circulation system;

[0020] Figure 3 The pressure-enthalpy diagram of the air conditioning system provided by the present invention is shown.

[0021] The above figures include the following reference numerals:

[0022] 10. Compressor; 11. Housing; 12. First cylinder; 13. Second cylinder; 14. Upper flange; 15. Partition plate; 16. Lower flange;

[0023] 20. Condenser;

[0024] 30. First throttling section;

[0025] 40. Flash evaporator;

[0026] 50. First separator;

[0027] 60. First evaporator;

[0028] 70. Second evaporator;

[0029] 80. Second separator;

[0030] 90. Second throttling section;

[0031] 100. Check valve. Detailed Implementation

[0032] 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 following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] like Figure 1As shown, an embodiment of the present invention provides an air conditioning system, including a compressor 10, a condenser 20, a first throttling section 30, a flash evaporator 40, a first liquid distributor 50, a first evaporator 60, and a second evaporator 70 forming a circulating flow path; the compressor 10 includes a housing 11 and a first cylinder 12 and a second cylinder 13 disposed within the housing 11, the outlet of the first cylinder 12 and the outlet of the second cylinder 13 are both connected to the cavity within the housing 11, and the two ends of the first throttling section 30 are respectively connected to the inlet of the flash evaporator 40 and the condenser 20; when the air conditioning system is in cooling mode, the cavity of the housing 11 is connected to the condenser 20, the gas phase outlet of the flash evaporator 40 is connected to the first liquid distributor 50, the liquid phase outlet of the flash evaporator 40 is connected to the inlet of the first evaporator 60 and the inlet of the second evaporator 70, the outlet of the first evaporator 60 is connected to the first liquid distributor 50, the outlet of the second evaporator 70 is connected to the inlet of the second cylinder 13, and the first liquid distributor 50 is connected to the inlet of the first cylinder 12.

[0034] In this embodiment, the output flow path of the flash evaporator 40 is divided into two paths. One path directly enters the first evaporator 60 (high-temperature evaporator) for heat absorption and evaporation, while the other path, after throttling and pressure reduction, enters the second evaporator 70 (low-temperature evaporator). The medium-pressure refrigerant output from the first evaporator 60 is drawn into the first cylinder 12 (high-pressure cylinder) as suction gas, compressed to high pressure, and discharged from the compressor 10. The low-pressure refrigerant output from the second evaporator 70 is drawn into the second cylinder 13 (low-pressure cylinder) as suction gas, compressed to high pressure, and discharged from the compressor 10. The two refrigerant paths are compressed independently. The flash evaporator 40 outputs... The low-temperature gaseous fluid from the flash evaporator 40 merges with the high-temperature gaseous fluid from the first evaporator 60, and together they are drawn into the first cylinder 12 as suction. Within the first cylinder 12, the gas is compressed to high pressure and discharged from the compressor 10. By configuring the gas path of the flash evaporator 40 and using the first cylinder 12, the compression of the gaseous fluid output from the flash evaporator 40 from medium pressure to high pressure is achieved. This eliminates the need for a new compression mechanism (building a new mechanism would add a new cylinder, making the entire compressor structure complex, increasing energy consumption, and raising the difficulty of component processing and assembly), thus reducing energy loss and improving energy efficiency. By setting up a first distributor 50 (high-pressure distributor), the high-temperature gaseous fluid output from the first evaporator 60 is cooled by the low-temperature gaseous fluid output from the flash evaporator 40. Compared to a conventional dual-evaporation temperature cycle system, this improves the overheating loss of the first cylinder 12. Simultaneously, the supplementary gas from the flash evaporator 40 effectively increases the cooling capacity of the air conditioning system, improving its performance.

[0035] Specifically, the first liquid separator 50 has a first inlet, a second inlet and a first outlet, the gas phase outlet of the flash evaporator 40 is connected to the first outlet of the first liquid separator 50, the outlet of the first evaporator 60 is connected to the second inlet of the first liquid separator 50, and the first outlet is connected to the first cylinder 12.

[0036] In this embodiment, when the air conditioning system is in cooling mode, the condenser 20 recools the high-temperature, high-pressure gaseous refrigerant in the housing 11 of the compressor 10 into a low-temperature, high-pressure liquid refrigerant. The compressed low-temperature, high-pressure liquid refrigerant flows through the first throttling section 30 and is compressed into a low-temperature, medium-pressure liquid refrigerant. The compressed low-temperature, medium-pressure liquid refrigerant is input into the flash evaporator 40 and flashed. The gas phase outlet of the flash evaporator 40 outputs low-temperature, medium-pressure saturated gaseous refrigerant. The gas phase outlet of the flash evaporator 40 is connected to the first inlet to deliver the output low-temperature, medium-pressure saturated gaseous refrigerant to the cavity of the first distributor 50. The flash evaporator 40 outputs low-temperature, medium-pressure saturated liquid refrigerant at its liquid phase outlet. The liquid phase outlet of the flash evaporator 40 is connected to the first evaporator 60 (high-temperature evaporator). The first evaporator 60 evaporates the low-temperature, medium-pressure saturated liquid refrigerant output from the flash evaporator 40 into high-temperature, medium-pressure saturated gaseous refrigerant and superheated gas. The outlet of the first evaporator 60 is connected to the second inlet of the first distributor 50 to deliver the output high-temperature, medium-pressure saturated gaseous refrigerant and superheated gas into the cavity of the first distributor 50. The refrigerant gas and liquid are separated in the first distributor 50, and the separated gaseous refrigerant is delivered to the first cylinder 12 and compressed into high-temperature, high-pressure gaseous refrigerant by the first cylinder 12. In this configuration, the low-temperature, medium-pressure saturated gaseous refrigerant output from the flash evaporator 40 and the high-temperature, medium-pressure saturated gaseous refrigerant output from the first evaporator 60 converge in the first distributor 50. The low-temperature, medium-pressure saturated gaseous refrigerant cools both the high-temperature, medium-pressure saturated gaseous refrigerant and the superheated gas, while simultaneously replenishing the gas supplied to the first cylinder 12. This prevents the gaseous refrigerant in the first cylinder 12 from overheating due to excessively high temperatures, thus increasing the cooling capacity of the air conditioning system. Furthermore, during the process of the low-temperature, medium-pressure saturated gaseous refrigerant being supplied to the first distributor 50, some of the gaseous refrigerant exchanges heat with the external environment and condenses into liquid or vapor. By using the first distributor 50, this liquid or vaporous refrigerant is prevented from being directly supplied to the first cylinder 12, which could lead to malfunction or damage, ensuring the reliability of the gaseous refrigerant circulation.

[0037] Furthermore, the cavity of the first liquid separator 50 includes a first liquid phase zone and a first gas phase zone. The first gas phase zone is located above the first liquid phase zone. The first inlet and the second inlet are located at the top of the first liquid separator 50 and communicate with the first gas phase zone. The first outlet is located at the bottom of the first liquid separator 50 and communicates with the first liquid phase zone. One end of the pipe connecting the first liquid separator 50 and the flash evaporator 40 passes through the first inlet from the top of the first liquid separator 50 and communicates with the first gas phase zone. One end of the pipe connecting the first liquid separator 50 and the first evaporator 60 passes through the second inlet from the top of the first liquid separator 50 and communicates with the first gas phase zone. One end of the pipe connecting the first liquid separator 50 and the first cylinder 12 passes through the first outlet from the bottom of the first liquid separator 50 and communicates with the first gas phase zone.

[0038] In this embodiment, the low-temperature, medium-pressure saturated gaseous refrigerant output from the flash evaporator 40 and some of the vapor / liquid refrigerant generated during the transportation process are transported from the top of the first distributor 50 to the first gas phase zone, where gas-liquid separation is achieved. This results in the medium-pressure saturated gaseous refrigerant floating in the first gas phase zone and the vapor / liquid refrigerant falling into the first liquid phase zone. Similarly, the high-temperature gaseous refrigerant and superheated gas output from the first evaporator 60 enter from the top of the first distributor 50 and float in the first gas phase zone. The first cylinder 12 is connected to the first gas phase zone of the first distributor 50 to transport the converging gaseous refrigerant in the first gas phase zone to the first cylinder 12 for compression. The above-described piping design avoids the situation where the end of the pipe connecting the flash evaporator 40 or the first evaporator 60 to the first distributor 50 is connected to the first liquid phase zone, which would result in the direct transfer of gaseous refrigerant to the liquid refrigerant and a reduction in the gaseous refrigerant in the first gas phase zone. It also avoids the situation where one end of the pipe connecting the first distributor 50 to the first cylinder 12 is connected to the first liquid phase zone, which would result in the liquid refrigerant after separation being transferred to the first cylinder 12 through the pipe, causing malfunction or damage to the first cylinder 12. This ensures the reliability of the gaseous refrigerant circulation. Specifically, the refrigerant is gaseous at room temperature. When the air conditioner is in cooling mode, the gaseous or liquid refrigerant is stored in the first liquid phase zone. When the air conditioner switches to non-cooling mode (heating mode), the liquid or gaseous refrigerant in the first liquid phase zone evaporates into gaseous refrigerant.

[0039] like Figure 1 As shown, the air conditioning system also includes a second distributor 80, which has a third inlet and a second outlet. The outlet of the second evaporator 70 is connected to the third inlet, and the inlet and second outlet of the second cylinder 13 are connected. In this embodiment, the gaseous refrigerant delivered to the second distributor 80 may partially condense during transportation. By setting up the second distributor 80, this partial condensation of liquid or gaseous refrigerant is prevented from being directly delivered into the second cylinder 13, which could lead to malfunction or damage to the second cylinder 13, thus ensuring the reliability of the gaseous refrigerant circulation.

[0040] Furthermore, the cavity of the second distributor 80 (low-pressure distributor) includes a second liquid phase zone and a second gas phase zone. The second gas phase zone is located above the second liquid phase zone. A third inlet is located at the top of the second distributor 80 and communicates with the second gas phase zone. A second outlet is located at the bottom of the second distributor 80 and communicates with the second liquid phase zone. One end of the pipe connecting the second distributor 80 and the second evaporator 70 passes through the third inlet from the top of the second distributor 80 and communicates with the second gas phase zone. One end of the pipe connecting the second distributor 80 and the second cylinder 13 passes through the second outlet from the bottom of the second distributor 80 and communicates with the second gas phase zone.

[0041] In this embodiment, the gaseous refrigerant output from the second evaporator 70 and a portion of the vapor / liquid refrigerant generated during the transportation process are transported from the top of the second distributor 80 to the second gas phase zone, where gas-liquid separation is achieved. This results in the gaseous refrigerant floating in the second gas phase zone and the vapor / liquid refrigerant falling into the second liquid phase zone. The second cylinder 13 is connected to the second gas phase zone of the second distributor 80 to transport the gaseous refrigerant in the second gas phase zone to the second cylinder 13 for compression. This pipeline design avoids the situation where the end of the pipeline connecting the second evaporator 70 and the second distributor 80 is connected to the second liquid phase zone, leading to direct delivery of gaseous refrigerant into the liquid refrigerant and a reduction in the gaseous refrigerant in the second gas phase zone. It also avoids the situation where one end of the pipeline connecting the second distributor 80 and the second cylinder 13 is connected to the second liquid phase zone, causing the separated liquid refrigerant to be transported to the second cylinder 13 through the pipeline, potentially leading to malfunction or damage to the second cylinder 13. This ensures the reliability of the gaseous refrigerant circulation. The refrigerant is gaseous at room temperature. When the air conditioner is in cooling mode, the gaseous or liquid refrigerant is stored in the second liquid phase zone. When the air conditioner switches to non-cooling mode (heating mode), the liquid or gaseous refrigerant in the second liquid phase zone evaporates into gaseous refrigerant.

[0042] like Figure 1 As shown, the air conditioning system also includes a second throttling section 90, which is located on the pipeline connecting the liquid phase outlet of the flash evaporator 40 and the inlet of the second evaporator 70. In this embodiment, while the low-temperature, medium-pressure saturated liquid refrigerant output from the flash evaporator 40 is being transported to the first evaporator 60, a portion of it also flows to the second throttling section 90. This portion of the low-temperature, medium-pressure saturated liquid refrigerant is compressed into a low-temperature, low-pressure saturated gas-liquid two-phase refrigerant in the second throttling section 90 and then transported to the second evaporator 70. The low-temperature, low-pressure saturated gas-liquid two-phase refrigerant output from the second throttling section 90 is evaporated into a medium-temperature, low-pressure saturated gaseous refrigerant and superheated gas in the second evaporator 70. This gaseous portion is then transported to the second distributor 80 for gas-liquid separation. The separated medium-temperature, low-pressure saturated gaseous refrigerant is then transported to the low-pressure cylinder and compressed into a high-temperature, high-pressure gaseous refrigerant.

[0043] Specifically, both the first throttling section 30 and the second throttling section 90 are capillary tubes. When the air conditioning system is in cooling mode, the first throttling section 30 is used to convert the low-temperature, high-pressure gas output from the condenser 20 into a low-temperature, medium-pressure gas, and the second throttling section 90 is used to convert the low-temperature, medium-pressure liquid output from the flash evaporator 40 into a low-temperature, low-pressure liquid. This configuration, using capillary tubes for both the first throttling section 30 and the second throttling section 90, results in a simple structure and low cost. The first throttling section 30 and the second throttling section 90 can be replaced with a throttling valve, an expansion valve, or a capillary tube as needed.

[0044] Furthermore, the air conditioning system also includes a one-way valve 100, which is installed on the pipeline connecting the gas phase outlet of the flash evaporator 40 and the first inlet of the first distributor 50.

[0045] In this embodiment, since the pressure of the low-temperature medium-pressure saturated gaseous refrigerant output by the flash evaporator 40 is unstable, the gaseous refrigerant is prone to backflow when it is delivered to the first distributor 50. By setting a one-way valve to control the pressure of the gaseous refrigerant in the flow path, backflow of the refrigerant is prevented, so that the flow path of the gas phase outlet of the flash evaporator 40 can maintain pressure for a long time, ensuring the reliability of the gaseous refrigerant circulation.

[0046] like Figure 1 As shown, the compressor 10 also includes an upper flange 14, a lower flange 16, and a partition 15. The upper flange 14, the first cylinder 12, the partition 15, the second cylinder 13, and the lower flange 16 are stacked sequentially from top to bottom inside the housing 11. This arrangement secures the first cylinder 12 and the second cylinder 13 via the upper flange 14 and the lower flange 16, and separates the first cylinder 12 and the second cylinder 13 via the partition 15.

[0047] Specifically, both the upper flange 14 and the lower flange 16 have a connecting cavity. The connecting cavity of the upper flange 14 is connected to the first cylinder 12, and the connecting cavity of the lower flange 16 is connected to both the second cylinder 13 and the connecting cavity of the upper flange 14. The connecting cavity of the upper flange 14 is connected to the first cylinder 12, and a flow port communicating with the cavity of the outer casing 11 is located above the connecting cavity of the upper flange 14. The gas in the first cylinder 12 and the second cylinder 13 flows into the connecting cavity of the upper flange 14 and is discharged. In this embodiment, the bottom of the outer casing 11 has an oil sump. Through the connection between the cavities of the upper flange 14 and the lower flange 16, the gas in the second cylinder 13 is prevented from being directly discharged through the lower flange 16. The gaseous refrigerant passes through the oil sump and is discharged from the outer casing 11 with oil adhering to its surface, ensuring the reliability of the gaseous refrigerant circulation.

[0048] like Figure 2 As shown, this represents the EER improvement of the loop system provided by this solution compared to a normal single-stage loop. Figure 2 The cooling operating parameters are as follows:

[0049] Operating Condition 1 19 10 50 Operating Condition 2 16 10 46 Operating Condition 3 22 12 41 Operating Condition 4 16 14 38

[0050] like Figure 3The diagram shown is the pressure-enthalpy diagram of the circulation system provided in this solution. The horizontal axis (h) represents the enthalpy value, and the vertical axis (lgp) represents the pressure. The pressure-enthalpy diagram of the bipolar circulation air conditioning system provided in this application is as follows: Evaporation 1: h4—h1, Evaporation 2: h5—h1', Compression: h1—h1'—h2, Compression: h2—h3, Throttling and pressure reduction: h3—h5—h3'—h4, where h5 is the flash point. The unit mass cooling capacity q is the heat absorbed by 1 kg of refrigerant (cooling medium) from the object being cooled within the evaporator (including flash evaporator 40, first evaporator 60, and second evaporator 70). In existing bipolar cycle systems, the cooling capacity q1 per unit mass is the heat absorbed by the refrigerant during the process from h1 to h4. In contrast, the cooling capacity q2 per unit mass of the bipolar cycle system in this application is the heat absorbed by the refrigerant during the process from h1' to h4. The enthalpy and pressure at position h1' are both greater than those at h1, therefore the bipolar cycle system provided in this application has better energy efficiency.

[0051] In summary, the system provided by this solution features a two-way liquid path for the flash evaporator 40, with a reasonable flow path allocation and high system energy efficiency. Furthermore, the gas path of the flash evaporator 40 and the gas path of the first evaporator 60 converge to cool the gas output from the first evaporator 60, improving the situation where the first cylinder 12 is prone to overheating and power loss in the prior art. At the same time, the replenishment of gas by the flash evaporator 40 effectively increases the cooling capacity of the air conditioning system and improves the performance of the air conditioning system.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the 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. An air conditioning system, characterized in that, It includes a compressor (10), a condenser (20), a first throttling section (30), a flash evaporator (40), a first distributor (50), a first evaporator (60), and a second evaporator (70) that form a circulating flow path; The compressor (10) includes a housing (11) and a first cylinder (12) and a second cylinder (13) disposed in the housing (11). The outlet of the first cylinder (12) and the outlet of the second cylinder (13) are both connected to the cavity inside the housing (11). The two ends of the first throttling section (30) are respectively connected to the inlet of the flash evaporator (40) and the condenser (20). When the air conditioning system is in cooling mode, the cavity of the outer shell (11) is connected to the condenser (20), the gas phase outlet of the flash evaporator (40) is connected to the first liquid distributor (50), the liquid phase outlet of the flash evaporator (40) is connected to the inlet of the first evaporator (60) and the inlet of the second evaporator (70), the outlet of the first evaporator (60) is connected to the first liquid distributor (50), the outlet of the second evaporator (70) is connected to the inlet of the second cylinder (13), and the first liquid distributor (50) is connected to the inlet of the first cylinder (12). The first liquid separator (50) has a first inlet, a second inlet and a first outlet. The gas phase outlet of the flash evaporator (40) is connected to the first outlet of the first liquid separator (50). The outlet of the first evaporator (60) is connected to the second inlet of the first liquid separator (50). The first outlet is connected to the first cylinder (12). The cavity of the first liquid separator (50) includes a first liquid phase zone and a first gas phase zone. The first gas phase zone is located above the first liquid phase zone. The first inlet and the second inlet are located at the top of the first liquid separator (50) and communicate with the first gas phase zone. The first outlet is located at the bottom of the first liquid separator (50) and communicates with the first liquid phase zone. One end of the pipe connecting the first liquid separator (50) and the flash evaporator (40) passes through the first inlet from above the first liquid separator (50) and communicates with the first gas phase zone. One end of the pipe connecting the first liquid separator (50) and the first evaporator (60) passes through the second inlet from above the first liquid separator (50) and communicates with the first gas phase zone. One end of the pipe connecting the first liquid separator (50) and the first cylinder (12) passes through the first outlet from below the first liquid separator (50) and communicates with the first gas phase zone.

2. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a second distributor (80) having a third inlet and a second outlet, the outlet of the second evaporator (70) being connected to the third inlet, and the inlet of the second cylinder (13) being connected to the second outlet.

3. The air conditioning system according to claim 2, characterized in that, The cavity of the second liquid separator (80) includes a second liquid phase zone and a second gas phase zone. The second gas phase zone is located above the second liquid phase zone. The third inlet is located at the top of the second liquid separator (80) and communicates with the second gas phase zone. The second outlet is located at the bottom of the second liquid separator (80) and communicates with the second liquid phase zone. One end of the pipe connecting the second liquid separator (80) and the second evaporator (70) passes through the third inlet from above the second liquid separator (80) and communicates with the second gas phase zone. One end of the pipe connecting the second liquid separator (80) and the second cylinder (13) passes through the second outlet from below the second liquid separator (80) and communicates with the second gas phase zone.

4. The air conditioning system according to claim 1, characterized in that, The air conditioning system further includes a second throttling section (90), which is disposed on the pipeline connecting the liquid phase outlet of the flash evaporator (40) and the inlet of the second evaporator (70).

5. The air conditioning system according to claim 4, characterized in that, Both the first throttling section (30) and the second throttling section (90) are capillary tubes. When the air conditioning system is in cooling mode, the first throttling section (30) is used to convert the low-temperature high-pressure gas output by the condenser (20) into low-temperature medium-pressure gas, and the second throttling section (90) is used to convert the low-temperature medium-pressure liquid output by the flash evaporator (40) into low-temperature low-pressure liquid.

6. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a one-way valve (100), which is disposed on the pipeline connecting the gas phase outlet of the flash evaporator (40) and the first inlet of the first distributor (50).

7. The air conditioning system according to claim 1, characterized in that, The compressor (10) also includes an upper flange (14), a lower flange (16) and a partition (15), wherein the upper flange (14), the first cylinder (12), the partition (15), the second cylinder (13) and the lower flange (16) are stacked sequentially from top to bottom inside the housing (11).

8. The air conditioning system according to claim 7, characterized in that, Both the upper flange (14) and the lower flange (16) have a connecting cavity. The connecting cavity of the upper flange (14) is connected to the first cylinder (12). The connecting cavity of the lower flange (16) is connected to the second cylinder (13) and the connecting cavity of the upper flange (14) respectively. The connecting cavity of the upper flange (14) is connected to the first cylinder (12). The upper flange (14) has a flow port above the connecting cavity that is connected to the cavity of the outer shell (11). The gas in the first cylinder (12) and the second cylinder (13) flows into the connecting cavity of the upper flange (14) and is discharged.

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