Pump body structure, compressor and air conditioning system

Abstract

This invention provides a pump body structure, a compressor, and an air conditioning system. The pump body structure includes: a low-pressure cylinder with a low-pressure intake port communicating with its cavity; a high-pressure cylinder with a high-pressure intake port communicating with its cavity, the high-pressure cylinder being positioned below the motor in the compressor, and the low-pressure cylinder being positioned between the high-pressure cylinder and the motor; a high-pressure exhaust chamber and a high-pressure exhaust port, the cavity of the high-pressure cylinder communicating with the high-pressure exhaust chamber and the high-pressure exhaust port communicating with the high-pressure exhaust port; and a low-pressure exhaust passage communicating with the cavity of the low-pressure cylinder, allowing airflow within the cavity of the low-pressure cylinder to be discharged to the outside of the low-pressure cylinder through the low-pressure exhaust passage. By controlling the connection and disconnection between the low-pressure exhaust passage and the cavity of the high-pressure cylinder, the pump body structure can be adjusted to operate in a dual-cylinder or dual-stage state. The pump body structure of this invention solves the problem of low energy efficiency in existing dual-stage enthalpy-increasing compressors when applied to normal operating conditions.

Description

Technical Field

[0001] This invention relates to the field of air conditioning systems, and more specifically, to a pump structure, a compressor, and an air conditioning system. Background Technology

[0002] Air source heat pump air conditioners are characterized by high efficiency, cleanliness, and zero pollution, and there is a huge market demand for them.

[0003] Currently, conventional heat pump air conditioners use single-stage rolling rotor compressors, which can cause problems such as rapid capacity decay, high exhaust temperature, and poor reliability when heating at low temperatures and cooling at high temperatures. This is because the pressure ratio and pressure difference increase significantly, and the refrigerant circulation flow rate decreases rapidly.

[0004] To address the aforementioned industry bottlenecks, after long-term research and in-depth analysis, a solution for achieving two-stage enthalpy enhancement on a single rolling rotor compressor was proposed: adding a stage to the single-stage compression to form two-stage compression, thereby increasing the limit range of pressure ratio and pressure difference; through intermediate gas injection (enthalpy enhancement) in the two-stage throttling stage, the refrigerant circulation flow rate in the high-pressure stage is increased, improving cooling / heating capacity and reducing exhaust temperature.

[0005] However, when a two-stage enthalpy-increasing compressor designed for harsh operating conditions is applied to normal operating conditions, the number of friction pairs is greater than that of a single-stage twin-cylinder compressor of the same displacement, resulting in lower energy efficiency. Summary of the Invention

[0006] The main objective of this invention is to provide a pump body structure, a compressor, and an air conditioning system to solve the problem of low energy efficiency of existing two-stage enthalpy-increasing compressors when applied to normal operating conditions.

[0007] To achieve the above objectives, according to one aspect of the present invention, a pump body structure is provided, comprising: a low-pressure cylinder having a low-pressure intake port communicating with its cavity; a high-pressure cylinder having a high-pressure intake port communicating with its cavity, the high-pressure cylinder being disposed below the motor in a compressor, and the low-pressure cylinder being disposed between the high-pressure cylinder and the motor; a high-pressure exhaust chamber and a high-pressure exhaust port, the cavity of the high-pressure cylinder communicating with the high-pressure exhaust chamber, and the high-pressure exhaust chamber communicating with the high-pressure exhaust port; and a low-pressure exhaust passage communicating with the cavity of the low-pressure cylinder, so that the airflow in the cavity of the low-pressure cylinder is discharged to the outside of the low-pressure cylinder through the low-pressure exhaust passage, and the pump body structure is adjusted to a dual-cylinder working state or a dual-stage working state by controlling the connection and disconnection between the low-pressure exhaust passage and the cavity of the high-pressure cylinder.

[0008] Furthermore, the high-pressure exhaust chamber is located on the side of the high-pressure cylinder away from the low-pressure cylinder.

[0009] Furthermore, the pump body structure also includes: a first flange, which is located on the side of the high-pressure cylinder away from the low-pressure cylinder, and a high-pressure exhaust groove is provided on the first flange; and a flange cover plate, which is located on the side of the first flange away from the high-pressure cylinder, and the groove of the high-pressure exhaust groove is connected to the flange cover plate to form a high-pressure exhaust chamber.

[0010] Furthermore, the pump body structure also includes: a first partition and a second partition, which are sandwiched between the high-pressure cylinder and the low-pressure cylinder, forming a low-pressure buffer chamber between the first partition and the second partition, and the low-pressure buffer chamber is connected to the cavity of the low-pressure cylinder.

[0011] Furthermore, the first partition is located on the side of the second partition away from the high-pressure cylinder, and the first partition is provided with a low-pressure buffer groove, the opening of which is connected to the second partition to form a low-pressure buffer chamber.

[0012] Furthermore, the pump body structure also includes: a first partition and a second partition, which are sandwiched between the high-pressure cylinder and the low-pressure cylinder, forming a high-pressure exhaust chamber between the first partition and the second partition, and the high-pressure exhaust port is located on the first partition or the second partition.

[0013] According to a second aspect of the present invention, a compressor is provided, comprising a housing and a pump body structure disposed within the housing, the pump body structure being the pump body structure described above. The compressor further comprises: a first pipeline, a first end of which is connected to the low-pressure suction port of the low-pressure cylinder of the pump body structure, and a second end of which is connected to the evaporator of an air conditioning system; a second pipeline, a first end of which is connected to the high-pressure suction port of the high-pressure cylinder of the pump body structure; and a third pipeline, a first end of which is connected to the cavity of the housing, and a second end of which is connected to the second pipeline or the condenser of the air conditioning system, and a second end of which is connected to the third pipeline or the evaporator of the air conditioning system; wherein, the low-pressure exhaust passage of the pump body structure is connected to the cavity of the housing, so that gas in the low-pressure exhaust passage enters the third pipeline through the cavity of the housing.

[0014] Furthermore, the compressor also includes: a fourth pipeline, the first end of which is connected to the high-pressure exhaust port of the pump body structure, and the second end of which is connected to the condenser of the air conditioning system; and a fifth pipeline, the first end of which is connected to the cavity of the housing, and the second end of which is connected to the flash evaporator of the air conditioning system.

[0015] Furthermore, the compressor has a two-stage operating mode and a two-cylinder operating mode. When the compressor is in the two-stage operating mode, the second pipeline is connected to the third pipeline so that the gas discharged from the third pipeline enters the cavity of the high-pressure cylinder through the second pipeline. When the compressor is in the two-cylinder operating mode, the first pipeline is connected to the second pipeline in parallel so that the second pipeline is connected to the evaporator, and the third pipeline is connected to the fourth pipeline in parallel so that the third pipeline is connected to the condenser.

[0016] Furthermore, the first pipeline includes a first suction pipe and a first liquid separator disposed on the first suction pipe; and / or the second pipeline includes a second suction pipe and a second liquid separator disposed on the second suction pipe; and / or the fifth pipeline includes an enthalpy-increasing pipe and an enthalpy-increasing component disposed on the enthalpy-increasing pipe.

[0017] According to a third aspect of the present invention, an air conditioning system is provided, comprising a compressor, a condenser, a flash evaporator and an evaporator connected in sequence, wherein the compressor is the compressor described above.

[0018] Furthermore, the air conditioning system also includes: a first intake branch pipe, the first end of which is connected to the second end of the first pipeline, and the evaporator is connected to the first intake branch pipe; a second intake branch pipe, the first end of which is connected to the second end of the second pipeline, and the second end of the first intake branch pipe is connected to the second end of the second intake branch pipe, so that the second intake branch pipe is connected to the evaporator through the first intake branch pipe; and a first on / off control valve, which is disposed on the first intake branch pipe to control the on / off connection between the first intake branch pipe and the second intake branch pipe.

[0019] Furthermore, the air conditioning system also includes: a transition branch pipe, the first end of which is connected to the second intake branch pipe, and the second end of which is connected to the second end of the third pipeline; and a second on / off control valve, which is installed on the transition branch pipe to control the on / off connection between the transition branch pipe and the second intake branch pipe.

[0020] Furthermore, the compressor also includes a fourth pipeline, the first end of which is connected to the high-pressure exhaust port of the pump body structure, and the second end of which is used to connect to the condenser of the air conditioning system. The air conditioning system also includes: a first exhaust branch pipe, the second end of which is connected to the second end of the third pipeline through the first exhaust branch pipe; a second exhaust branch pipe, the first end of which is connected to the second end of the transition branch pipe; a third exhaust branch pipe, the first end of which is connected to the fourth pipeline, and the second end of the third exhaust branch pipe, the second end of the second exhaust branch pipe, and the condenser are connected so that the airflow in the second exhaust branch pipe and the third exhaust branch pipe merges and flows together to the condenser; and a third on / off control valve, which is installed on the second exhaust branch pipe.

[0021] Furthermore, the compressor also includes a fourth pipeline. The first end of the fourth pipeline is connected to the high-pressure exhaust port of the pump body structure, and the second end of the fourth pipeline is used to connect to the condenser of the air conditioning system. The air conditioning system also includes: a four-way reversing valve, the first valve port of the four-way reversing valve is connected to the second end of the first pipeline, the second valve port of the four-way reversing valve is connected to the second end of the second pipeline, and the third valve port of the four-way reversing valve is connected to the second end of the third pipeline; a fourth on-off control valve, which is installed on the pipe body between the four-way reversing valve and the second end of the first pipeline, and the evaporator is connected to the pipe body between the fourth on-off control valve and the second end of the first pipeline; and a three-way valve, the first valve port of the three-way valve is connected to the fourth valve port of the four-way reversing valve, the second valve port of the three-way valve is connected to the second end of the fourth pipeline, and the third valve port of the three-way valve is connected to the condenser.

[0022] Furthermore, the fourth on / off control valve is a check valve, and the outlet of the check valve is connected to the first valve port of the four-way directional valve.

[0023] Applying the technical solution of this invention, the pump body structure includes a low-pressure cylinder, a high-pressure cylinder, a high-pressure exhaust chamber, a high-pressure exhaust port, and a low-pressure exhaust channel. The low-pressure cylinder has a low-pressure intake port communicating with its cavity, and the high-pressure cylinder has a high-pressure intake port communicating with its cavity. The cavity of the high-pressure cylinder is connected to the high-pressure exhaust port via the high-pressure exhaust chamber, and the cavity of the low-pressure cylinder is connected to the outside of the low-pressure cylinder via the low-pressure exhaust channel. Under harsh operating conditions, the low-pressure exhaust channel is connected to the cavity of the high-pressure cylinder, placing the pump body structure in a two-stage operating state. Under normal operating conditions, the low-pressure exhaust channel is disconnected from the cavity of the high-pressure cylinder, placing the pump body structure in a single-stage dual-cylinder operating state. This allows the pump body structure to have high energy efficiency under normal operating conditions and maintain energy efficiency even under harsh operating conditions, improving the reliability of the pump body structure and solving the problem of low energy efficiency in existing two-stage enthalpy-increasing compressors applied under normal operating conditions. Attached Figure Description

[0024] 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:

[0025] Figure 1 A schematic diagram of an embodiment of a compressor according to the present invention is shown;

[0026] Figure 2 A schematic diagram of the pump body structure according to a first embodiment of the present invention is shown;

[0027] Figure 3 It shows Figure 2 A schematic diagram of the refrigerant flow direction in the two-stage operation state of the pump body structure shown;

[0028] Figure 4 It shows Figure 2 The diagram shows the refrigerant flow direction of the pump body structure in dual-cylinder operation.

[0029] Figure 5 A schematic diagram of the refrigerant flow direction of the pump body structure according to a second embodiment of the present invention in a two-stage operating state is shown;

[0030] Figure 6 It shows Figure 5 The diagram shows the refrigerant flow direction of the pump body structure in dual-cylinder operation mode;

[0031] Figure 7 A schematic diagram of the refrigerant flow direction of the pump body structure according to a third embodiment of the present invention in a two-stage operating state is shown;

[0032] Figure 8 It shows Figure 7 The diagram shows the refrigerant flow direction of the pump body structure in dual-cylinder operation mode;

[0033] Figure 9 A schematic diagram of the refrigerant flow direction of an air conditioning system in a two-stage operating state according to a first embodiment of the present invention is shown;

[0034] Figure 10 It shows Figure 9 The diagram shows the refrigerant flow direction of the air conditioning system in dual-cylinder operation mode;

[0035] Figure 11 A schematic diagram of the refrigerant flow direction of an air conditioning system according to a second embodiment of the present invention in a two-stage operating state is shown; and

[0036] Figure 12 It shows Figure 11 The diagram shows the refrigerant flow direction of the air conditioning system in dual-cylinder operation.

[0037] The above figures include the following reference numerals:

[0038] 1. Crankshaft; 2. Low-pressure cylinder; 201. Low-pressure intake port; 3. High-pressure cylinder; 301. High-pressure intake port; 4. High-pressure exhaust chamber; 401. High-pressure exhaust port; 5. Low-pressure exhaust passage; 501. Low-pressure buffer chamber; 6. First flange; 7. Flange cover plate; 8. First partition plate; 9. Second partition plate; 10. Housing; 20. Pump body structure; 11. First pipeline; 111. First intake pipe; 112. First distributor; 12. Second pipeline; 121. Second intake pipe; 122. Second distributor; 13. Third pipeline; 14. Fourth pipeline ; 15. Fifth pipeline; 151. Enthalpy-increasing pipe; 152. Enthalpy-increasing component; 100. Compressor; 200. Condenser; 300. Flash evaporator; 400. Evaporator; 510. First suction branch pipe; 520. Second suction branch pipe; 511. First on / off control valve; 530. Transition branch pipe; 531. Second on / off control valve; 540. First exhaust branch pipe; 550. Second exhaust branch pipe; 551. Third on / off control valve; 560. Third exhaust branch pipe; 570. Four-way reversing valve; 580. Fourth on / off control valve; 590. Three-way valve. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] like Figures 1 to 12 As shown, the present invention provides a pump body structure, including: a low-pressure cylinder 2, which has a low-pressure intake port 201 communicating with its cavity; a high-pressure cylinder 3, which has a high-pressure intake port 301 communicating with its cavity, the high-pressure cylinder 3 being disposed below the motor in the compressor, and the low-pressure cylinder 2 being disposed between the high-pressure cylinder 3 and the motor; a high-pressure exhaust chamber 4 and a high-pressure exhaust port 401, the cavity of the high-pressure cylinder 3 being connected to the high-pressure exhaust chamber 4, and the high-pressure exhaust chamber 4 being connected to the high-pressure exhaust port 401; and a low-pressure exhaust channel 5, which is connected to the cavity of the low-pressure cylinder 2, so that the airflow in the cavity of the low-pressure cylinder 2 is discharged to the outside of the low-pressure cylinder 2 through the low-pressure exhaust channel 5, and the pump body structure is adjusted to a dual-cylinder working state or a dual-stage working state by controlling the opening and closing of the low-pressure exhaust channel 5 and the cavity of the high-pressure cylinder 3.

[0041] The pump body structure of the present invention includes a low-pressure cylinder 2, a high-pressure cylinder 3, a high-pressure exhaust chamber 4, a high-pressure exhaust port 401, and a low-pressure exhaust channel 5. The low-pressure cylinder 2 is positioned between the high-pressure cylinder 3 and the compressor motor. The low-pressure cylinder 2 has a low-pressure suction port 201 communicating with its cavity, and the high-pressure cylinder 3 has a high-pressure suction port 301 communicating with its cavity. The cavity of the high-pressure cylinder 3 is connected to the high-pressure exhaust port 401 via a high-pressure exhaust chamber 4. The cavity of the low-pressure cylinder 2 is connected to the outside of the low-pressure cylinder 2 via a low-pressure exhaust passage 5. Under harsh operating conditions, the low-pressure exhaust passage 5 is connected to the cavity of the high-pressure cylinder 3, placing the pump structure in a two-stage operating state. Under normal operating conditions, the low-pressure exhaust passage 5 is disconnected from the cavity of the high-pressure cylinder 3, placing the pump structure in a single-stage dual-cylinder operating state. This design ensures high energy efficiency under normal operating conditions and prevents energy degradation under harsh operating conditions, improving the reliability of the pump structure and solving the problem of low energy efficiency in existing two-stage enthalpy-increasing compressors used under normal operating conditions.

[0042] In the accompanying drawings of this invention, arrows indicate the direction of refrigerant flow.

[0043] Specifically, in Figures 3 to 8 In the diagram, the arrows are divided into three sizes: large, medium, and small. Large arrows indicate low-pressure refrigerant, medium arrows indicate medium-pressure refrigerant, and small arrows indicate high-pressure refrigerant.

[0044] Specifically, severe operating conditions refer to operating conditions where the ratio of the compressor's discharge pressure to its suction pressure or the difference between the discharge pressure and suction pressure is relatively large; normal operating conditions refer to operating conditions where the ratio of the compressor's discharge pressure to its suction pressure or the difference between the discharge pressure and suction pressure is relatively small.

[0045] Two-stage operation is for operating conditions where the ratio of exhaust pressure to intake pressure is relatively large. Because the two-cylinder operation is a single-stage compression, an excessively large ratio of exhaust pressure to intake pressure will lead to a decrease in energy efficiency and an increase in operating energy consumption. In addition, when the system operates at low ambient temperatures, the exhaust temperature will rise significantly, which may lead to the deterioration of lubricating oil. In this case, using two-stage operation can effectively improve this situation.

[0046] The low-pressure cylinder 2 has a large displacement and can serve as the first-stage compression cylinder in a two-stage operating state. Simultaneously, due to the large displacement of the low-pressure cylinder 2 in the pump body structure of this invention, its mass is also relatively large. The pump body structure is fixed by welding the low-pressure cylinder 2 or the second flange located above the low-pressure cylinder 2 to the housing 10. The mass below the weld point is small, resulting in a higher modal resonance frequency, making it less prone to resonance during low-pressure operation. Therefore, its vibration and noise during operation are also relatively low. Furthermore, overall, the mass of the upper eccentric portion of the crankshaft 1 is greater than the mass of the lower eccentric portion, which is beneficial to the dynamic and static balance of the crankshaft 1, reducing the deflection of the crankshaft 1 and improving its reliability.

[0047] like Figures 1 to 6 In the two embodiments shown, the high-pressure exhaust chamber 4 is located on the side of the high-pressure cylinder 3 away from the low-pressure cylinder 2.

[0048] Specifically, the pump body structure also includes: a first flange 6, which is located on the side of the high-pressure cylinder 3 away from the low-pressure cylinder 2, and a high-pressure exhaust groove is provided on the first flange 6; and a flange cover plate 7, which is located on the side of the first flange 6 away from the high-pressure cylinder 3, and the groove of the high-pressure exhaust groove is connected to the flange cover plate 7 to form a high-pressure exhaust chamber 4.

[0049] The first flange 6 and the flange cover plate 7 are both located on the side of the high-pressure cylinder 3 away from the low-pressure cylinder 2, and the first flange 6 is located between the high-pressure cylinder 3 and the flange cover plate 7. The first flange 6 and the flange cover plate 7 together form the high-pressure exhaust chamber 4.

[0050] The first flange 6 is provided with a high-pressure exhaust groove for forming a high-pressure exhaust chamber 4, and a high-pressure connecting hole for connecting the high-pressure exhaust groove with the high-pressure cylinder 3. The high-pressure exhaust port 401 is provided on the first flange 6 and is connected to the high-pressure exhaust groove, so that the refrigerant compressed by the high-pressure cylinder 3 enters the high-pressure exhaust chamber 4 through the high-pressure connecting hole, and then flows out from the high-pressure exhaust port 401 to the outside of the compressor.

[0051] like Figures 1 to 4 In the embodiment shown, the pump body structure further includes: a first partition 8 and a second partition 9, which are sandwiched between the high-pressure cylinder 3 and the low-pressure cylinder 2. A low-pressure buffer chamber 501 is formed between the first partition 8 and the second partition 9, and the low-pressure buffer chamber 501 is connected to the cavity of the low-pressure cylinder 2.

[0052] The first partition 8 and the second partition 9 are located between the high-pressure cylinder 3 and the low-pressure cylinder 2, with the first partition 8 located on the side of the second partition 9 away from the high-pressure cylinder 3. A low-pressure buffer chamber 501 is formed between the first partition 8 and the second partition 9. The first partition 8 is provided with an intermediate connecting hole that connects the cavity of the low-pressure cylinder 2 with the low-pressure buffer chamber 501. The low-pressure exhaust channel 5 is connected to the low-pressure buffer chamber 501 so that the refrigerant compressed by the low-pressure cylinder 2 enters the low-pressure buffer chamber 501 through the intermediate connecting hole and then flows out from the low-pressure exhaust channel 5 into the compressor housing.

[0053] Specifically, the first partition 8 is located on the side of the second partition 9 away from the high-pressure cylinder 3. The first partition 8 is provided with a low-pressure buffer groove, and the groove of the low-pressure buffer groove is connected to the second partition 9 to form a low-pressure buffer cavity 501.

[0054] like Figure 7 and Figure 8In the embodiment shown, the pump body structure further includes: a first partition 8 and a second partition 9, which are sandwiched between the high-pressure cylinder 3 and the low-pressure cylinder 2, forming a high-pressure exhaust chamber 4 between the first partition 8 and the second partition 9, and a high-pressure exhaust port 401 is provided on the first partition 8 or the second partition 9.

[0055] The first partition 8 and the second partition 9 are located between the high-pressure cylinder 3 and the low-pressure cylinder 2, with the first partition 8 located on the side of the second partition 9 away from the high-pressure cylinder 3. A high-pressure exhaust chamber 4 is formed between the first partition 8 and the second partition 9. A high-pressure exhaust groove is provided on the first partition 8, and the groove opening of the high-pressure exhaust groove is connected to the second partition 9 to form the high-pressure exhaust chamber 4. A high-pressure connecting hole is provided on the second partition 9 to connect the cavity of the high-pressure cylinder 3 with the high-pressure exhaust chamber 4. A high-pressure exhaust port 401 is provided on the first partition 8 and is connected to the high-pressure exhaust chamber 4 so that the refrigerant compressed by the high-pressure cylinder 3 enters the high-pressure exhaust chamber 4 through the high-pressure connecting hole and then flows out from the high-pressure exhaust port 401 to the outside of the compressor.

[0056] exist Figure 3 and Figure 4 In the first embodiment of the pump body structure, the first flange 6 and the flange cover plate 7 located on the side of the high-pressure cylinder 3 away from the low-pressure cylinder 2 form a high-pressure exhaust chamber 4, and the first partition plate 8 and the second partition plate 9 located between the high-pressure cylinder 3 and the low-pressure cylinder 2 form a low-pressure buffer chamber 501.

[0057] in, Figure 3 This is a schematic diagram of the refrigerant flow in the two-stage working state of the first embodiment of the pump body structure. At this time, the low-pressure exhaust channel 5 is connected to the cavity of the high-pressure cylinder 3. The refrigerant after being compressed once by the low-pressure cylinder 2 will enter the cavity of the high-pressure cylinder 3 for secondary compression, and then be discharged to the outside of the compressor. Figure 4 This is a schematic diagram of the refrigerant flow in the first embodiment of the pump body structure under dual-cylinder operation. At this time, the low-pressure exhaust passage 5 is disconnected from the cavity of the high-pressure cylinder 3. The low-pressure cylinder 2 and the high-pressure cylinder 3 respectively compress the refrigerant in their respective cavities and discharge it to the outside of the compressor.

[0058] exist Figure 5 and Figure 6 In the second embodiment of the pump body structure, the first flange 6 and the flange cover plate 7 located on the side of the high-pressure cylinder 3 away from the low-pressure cylinder 2 form a high-pressure exhaust chamber 4. This pump body structure does not have a low-pressure buffer chamber 501, and the exhaust from the low-pressure cylinder 2 directly enters the housing 10.

[0059] in, Figure 5This is a schematic diagram of the refrigerant flow in the two-stage working state of the first embodiment of the pump body structure. At this time, the low-pressure exhaust channel 5 is connected to the cavity of the high-pressure cylinder 3. The refrigerant after being compressed once by the low-pressure cylinder 2 will enter the cavity of the high-pressure cylinder 3 for secondary compression, and then be discharged to the outside of the compressor. Figure 6 This is a schematic diagram of the refrigerant flow in the first embodiment of the pump body structure under dual-cylinder operation. At this time, the low-pressure exhaust passage 5 is disconnected from the cavity of the high-pressure cylinder 3. The low-pressure cylinder 2 and the high-pressure cylinder 3 respectively compress the refrigerant in their respective cavities and discharge it to the outside of the compressor.

[0060] exist Figure 7 and Figure 8 In the third embodiment of the pump body structure, the first partition 8 and the second partition 9 located between the high-pressure cylinder 3 and the low-pressure cylinder 2 form a high-pressure exhaust chamber 4. This pump body structure does not have a low-pressure buffer chamber 501, and the exhaust from the low-pressure cylinder 2 directly enters the housing 10.

[0061] in, Figure 7 This is a schematic diagram of the refrigerant flow in the two-stage working state of the first embodiment of the pump body structure. At this time, the low-pressure exhaust channel 5 is connected to the cavity of the high-pressure cylinder 3. The refrigerant after being compressed once by the low-pressure cylinder 2 will enter the cavity of the high-pressure cylinder 3 for secondary compression, and then be discharged to the outside of the compressor. Figure 8 This is a schematic diagram of the refrigerant flow in the first embodiment of the pump body structure under dual-cylinder operation. At this time, the low-pressure exhaust passage 5 is disconnected from the cavity of the high-pressure cylinder 3. The low-pressure cylinder 2 and the high-pressure cylinder 3 respectively compress the refrigerant in their respective cavities and discharge it to the outside of the compressor.

[0062] like Figure 1 As shown, the present invention provides a compressor, including a housing 10 and a pump body structure 20 disposed within the housing 10. The pump body structure 20 is the pump body structure described above. The compressor further includes: a first pipeline 11, the first end of which is connected to the low-pressure suction port 201 of the low-pressure cylinder 2 of the pump body structure, and the second end of which is connected to the evaporator 400 of an air conditioning system; a second pipeline 12, the first end of which is connected to the high-pressure suction port 301 of the high-pressure cylinder 3 of the pump body structure; and a third pipeline 13, the first end of which is connected to the cavity of the housing 10, and the second end of which is connected to the second pipeline 12 or the condenser 200 of the air conditioning system, and the second end of the second pipeline 12 is connected to the third pipeline 13 or the evaporator 400 of the air conditioning system; wherein, the low-pressure exhaust passage 5 of the pump body structure 20 is connected to the cavity of the housing 10, so that the gas in the low-pressure exhaust passage 5 enters the third pipeline 13 through the cavity of the housing 10.

[0063] Specifically, the compressor also includes: a fourth pipe 14, the first end of which is connected to the high-pressure exhaust port 401 of the pump body structure, and the second end of which is connected to the condenser 200 of the air conditioning system; and a fifth pipe 15, the first end of which is connected to the cavity of the housing 10, and the second end of which is connected to the flash evaporator 300 of the air conditioning system.

[0064] Specifically, the compressor has a two-stage operating mode and a two-cylinder operating mode. When the compressor is in the two-stage operating mode, the second pipeline 12 is connected to the third pipeline 13 so that the gas discharged from the third pipeline 13 enters the cavity of the high-pressure cylinder 3 through the second pipeline 12. When the compressor is in the two-cylinder operating mode, the first pipeline 11 is connected to the second pipeline 12 in parallel so that the second pipeline 12 is connected to the evaporator 400, and the third pipeline 13 is connected to the fourth pipeline 14 in parallel so that the third pipeline 13 is connected to the condenser 200.

[0065] When the compressor is in two-stage operation, the second pipe 12 is connected to the third pipe 13, that is, the low-pressure exhaust passage 5 is connected to the cavity of the high-pressure cylinder 3. The refrigerant after being compressed once by the low-pressure cylinder 2 will enter the housing 10 and flow to the second pipe 12 through the third pipe 13 connected to the housing 10. Then, it flows into the cavity of the high-pressure cylinder 3 through the second pipe 12. After being compressed a second time by the high-pressure cylinder 3, it will be discharged to the condenser 200 outside the compressor.

[0066] When the compressor is in dual-cylinder operation, the first pipe 11 and the second pipe 12 are connected in parallel, and the third pipe 13 and the fourth pipe 14 are connected in parallel. The refrigerant to be compressed enters the low-pressure cylinder 2 and the high-pressure cylinder 3 through the first pipe 11 and the second pipe 12 respectively. After being compressed by the low-pressure cylinder 2 and the high-pressure cylinder 3 respectively, it is discharged to the condenser 200 outside the compressor through the third pipe 13 and the fourth pipe 14 respectively.

[0067] Specifically, the first pipeline 11 includes a first suction pipe 111 and a first distributor 112 disposed on the first suction pipe 111; and / or the second pipeline 12 includes a second suction pipe 121 and a second distributor 122 disposed on the second suction pipe 121; and / or the fifth pipeline 15 includes an enthalpy-increasing pipe 151 and an enthalpy-increasing component 152 disposed on the enthalpy-increasing pipe 151.

[0068] like Figures 9 to 12 As shown, the present invention provides an air conditioning system, including a compressor 100, a condenser 200, a flash evaporator 300 and an evaporator 400 connected in sequence, wherein the compressor 100 is the compressor described above.

[0069] like Figure 9 and Figure 10The embodiment shown further includes: a first intake branch pipe 510, the first end of which is connected to the second end of the first pipeline 11, and the evaporator 400 is connected to the first intake branch pipe 510; a second intake branch pipe 520, the first end of which is connected to the second end of the second pipeline 12, and the second end of the first intake branch pipe 510 is connected to the second end of the second intake branch pipe 520, so that the second intake branch pipe 520 is connected to the evaporator 400 through the first intake branch pipe 510; and a first on / off control valve 511, which is disposed on the first intake branch pipe 510 to control the on / off connection between the first intake branch pipe 510 and the second intake branch pipe 520.

[0070] Specifically, the air conditioning system also includes: a transition branch pipe 530, the first end of which is connected to the second intake branch pipe 520, and the second end of which is connected to the second end of the third pipe 13; and a second on / off control valve 531, which is installed on the transition branch pipe 530 to control the on / off connection between the transition branch pipe 530 and the second intake branch pipe 520.

[0071] Specifically, the compressor also includes a fourth pipe 14, the first end of which is connected to the high-pressure exhaust port 401 of the pump body structure, and the second end of which is connected to the condenser 200 of the air conditioning system. The air conditioning system also includes: a first exhaust branch pipe 540, the second end of which is connected to the second end of the third pipe 13 through the first exhaust branch pipe 540; a second exhaust branch pipe 550, the first end of which is connected to the second end of the transition branch pipe 530; a third exhaust branch pipe 560, the first end of which is connected to the fourth pipe 14, and the second ends of the third exhaust branch pipe 560, the second ends of the second exhaust branch pipe 550, and the condenser 200 are connected so that the airflow in the second exhaust branch pipe 550 and the third exhaust branch pipe 560 merges and flows together to the condenser 200; and a third on / off control valve 551, which is installed on the second exhaust branch pipe 550.

[0072] like Figure 9 and 10 As shown, the working process of the first embodiment of the air conditioning system of the present invention is as follows:

[0073] like Figure 9As shown, when the air conditioning system is in a two-stage operating state, the first on / off control valve 511 and the third on / off control valve 551 are closed, the second on / off control valve 531 is open, the second pipeline 12 and the third pipeline 13 are connected, and the refrigerant entering the cavity of the low-pressure cylinder 2 through the first pipeline 11 is discharged into the housing 10 after completing the first stage of compression in the low-pressure cylinder 2. At this time, the housing is a medium back pressure structure. The refrigerant in the housing 10 flows into the cavity of the high-pressure cylinder 3 through the third pipeline 13, the first exhaust branch pipe 540, the transition branch pipe 530, the second intake branch pipe 520 and the second pipeline 12 and undergoes secondary compression. Then it is discharged to the condenser 200 through the fourth pipeline 14 and the third exhaust branch pipe 560.

[0074] like Figure 10 As shown, when the air conditioning system is in dual-cylinder operation, the first on / off control valve 511 and the third on / off control valve 551 are open, the second on / off control valve 531 is closed, the first pipe 11 and the second pipe 12 are connected in parallel, and the third pipe 13 and the fourth pipe 14 are connected in parallel. A portion of the refrigerant enters the low-pressure cylinder 2 through the first pipe 11, and the refrigerant compressed by the low-pressure cylinder 2 is discharged into the housing 10, and then flows to the condenser 200 through the third pipe 13, the first exhaust branch pipe 540 and the second exhaust branch pipe 550. At the same time, another portion of the refrigerant enters the high-pressure cylinder 3 through the first intake branch pipe 510, the second intake branch pipe 520 and the second pipe 12, and the refrigerant compressed by the high-pressure cylinder 3 is discharged to the condenser 200 through the fourth pipe 14 and the third exhaust branch pipe 560.

[0075] like Figure 11 and Figure 12 In the embodiment shown, the compressor further includes a fourth pipe 14, the first end of which is connected to the high-pressure exhaust port 401 of the pump body structure, and the second end of which is connected to the condenser 200 of the air conditioning system. The air conditioning system further includes a four-way reversing valve 570, the first valve port of which is connected to the second end of the first pipe 11, the second valve port of which is connected to the second end of the second pipe 12, and the third valve port of which is connected to the second end of the third pipe 13. Connecting; Fourth on / off control valve 580, which is installed on the pipe body between the four-way reversing valve 570 and the second end of the first pipe 11, and the evaporator 400 is connected to the pipe body between the fourth on / off control valve 580 and the second end of the first pipe 11; Three-way valve 590, the first valve port of the three-way valve 590 is connected to the fourth valve port of the four-way reversing valve 570, the second valve port of the three-way valve 590 is connected to the second end of the fourth pipe 14, and the third valve port of the three-way valve 590 is connected to the condenser 200.

[0076] Preferably, the fourth on / off control valve 580 is a one-way valve, and the outlet of the one-way valve is connected to the first valve port of the four-way reversing valve 570. In this way, the one-way valve can control the on / off connection between the first valve port of the four-way reversing valve 570 and the first pipeline 11, so that part of the refrigerant flowing out of the evaporator enters the first pipeline 11, and the other part enters through the first valve port of the four-way reversing valve 570 and flows out through the second valve port to the second pipeline 12, and prevents the refrigerant at the first valve port of the four-way reversing valve 570 from flowing into the first pipeline 11, so as to prevent high-pressure refrigerant from entering the low-pressure side.

[0077] like Figure 11 and 12 As shown, the working process of the second embodiment of the air conditioning system of the present invention is as follows:

[0078] like Figure 11 As shown, when the air conditioning system is in a two-stage working state, the refrigerant entering the cavity of the low-pressure cylinder 2 through the first pipe 11 is compressed in the low-pressure cylinder 2 and then discharged into the housing 10. At this time, the housing is a medium back pressure structure. The refrigerant in the housing 10 flows into the cavity of the high-pressure cylinder 3 through the third pipe 13, the four-way reversing valve 570 and the second pipe 12 and is compressed a second time. Then it is discharged into the condenser 200 through the fourth pipe 14 and the three-way valve 590.

[0079] like Figure 12 As shown, when the air conditioning system is in dual-cylinder operation, the second and third valve ports of the four-way reversing valve 570 are connected, the first pipe 11 is connected in parallel with the second pipe 12, and the third pipe 13 is connected in parallel with the fourth pipe 14. Part of the refrigerant enters the low-pressure cylinder 2 through the first pipe 11, and the refrigerant compressed by the low-pressure cylinder 2 is discharged into the housing 10, and then flows out to the condenser 200 through the third pipe 13, the four-way reversing valve 570 and the three-way valve 590. At the same time, another part of the refrigerant enters the high-pressure cylinder 3 through the one-way valve, the four-way reversing valve 570 and the second pipe 12, and the refrigerant compressed by the high-pressure cylinder 3 is discharged to the condenser 200 through the fourth pipe 14 and the three-way valve 590.

[0080] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0081] The pump body structure of this invention includes a low-pressure cylinder 2, a high-pressure cylinder 3, a high-pressure exhaust chamber 4, a high-pressure exhaust port 401, and a low-pressure exhaust channel 5. The low-pressure cylinder 2 is provided with a low-pressure intake port 201 communicating with its cavity, and the high-pressure cylinder 3 is provided with a high-pressure intake port 301 communicating with its cavity. The cavity of the high-pressure cylinder 3 is connected to the high-pressure exhaust port 401 via the high-pressure exhaust chamber 4, and the cavity of the low-pressure cylinder 2 is connected to the outside of the low-pressure cylinder 2 via the low-pressure exhaust channel 5. Under harsh operating conditions, the low-pressure exhaust channel 5 is connected to the cavity of the high-pressure cylinder 3, putting the pump body structure in a two-stage operating state. Under normal operating conditions, the low-pressure exhaust channel 5 is disconnected from the cavity of the high-pressure cylinder 3, putting the pump body structure in a single-stage dual-cylinder operating state. This allows the pump body structure to have high energy efficiency under normal operating conditions and maintain energy efficiency even under harsh operating conditions, improving the reliability of the pump body structure and solving the problem of low energy efficiency in existing two-stage enthalpy-increasing compressors applied to normal operating conditions.

[0082] 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. A pump body structure, characterized in that, include: Low-pressure cylinder (2), the low-pressure cylinder (2) is provided with a low-pressure air intake (201) communicating with its cavity. High pressure cylinder (3), the high pressure cylinder (3) is provided with a high pressure suction port (301) communicating with its cavity, the high pressure cylinder (3) is located below the motor in the compressor, and the low pressure cylinder (2) is located between the high pressure cylinder (3) and the motor; High pressure exhaust chamber (4) and high pressure exhaust port (401), the cavity of the high pressure cylinder (3) is connected to the high pressure exhaust chamber (4), and the high pressure exhaust chamber (4) is connected to the high pressure exhaust port (401); The low-pressure exhaust channel (5) is connected to the cavity of the low-pressure cylinder (2) so that the airflow in the cavity of the low-pressure cylinder (2) is discharged to the outside of the low-pressure cylinder (2) through the low-pressure exhaust channel (5). By controlling the connection and disconnection between the low-pressure exhaust channel (5) and the cavity of the high-pressure cylinder (3), the pump body structure is adjusted to be in a dual-cylinder working state or a dual-stage working state. A first partition (8) and a second partition (9) are sandwiched between the high-pressure cylinder (3) and the low-pressure cylinder (2). The first partition (8) is located on the side of the second partition (9) away from the high-pressure cylinder (3). The first partition (8) is provided with a low-pressure buffer groove, the groove opening of which is connected to the second partition (9) to form a low-pressure buffer cavity (501). The low-pressure buffer cavity (501) is connected to the cavity of the low-pressure cylinder (2), and / or, The high-pressure exhaust chamber (4) is formed between the first partition (8) and the second partition (9), and the high-pressure exhaust port (401) is disposed on the first partition (8) or the second partition (9).

2. A compressor, comprising a housing (10) and a pump body structure (20) disposed within the housing (10), characterized in that, The pump body structure (20) is the pump body structure described in claim 1, and the compressor further includes: The first pipe (11) has its first end connected to the low-pressure intake port (201) of the low-pressure cylinder (2) of the pump body structure, and its second end is connected to the evaporator (400) of the air conditioning system. The second pipeline (12) has its first end connected to the high-pressure air intake (301) of the high-pressure cylinder (3) of the pump body structure. The third pipe (13) has a first end connected to the cavity of the housing (10), and a second end connected to the second pipe (12) or the condenser (200) of the air conditioning system. The second end of the second pipe (12) is connected to the third pipe (13) or the evaporator (400) of the air conditioning system. The low-pressure exhaust channel (5) of the pump body structure (20) is connected to the cavity of the housing (10) so that the gas in the low-pressure exhaust channel (5) enters the third pipeline (13) through the cavity of the housing (10).

3. The compressor according to claim 2, characterized in that, The compressor also includes: The fourth pipe (14) has its first end connected to the high-pressure exhaust port (401) of the pump body structure, and its second end connected to the condenser (200) of the air conditioning system. The fifth pipe (15) has its first end connected to the cavity of the housing (10), and its second end connected to the flash evaporator (300) of the air conditioning system.

4. The compressor according to claim 3, characterized in that, The compressor has a two-stage operating mode and a dual-cylinder operating mode. When the compressor is in the two-stage working mode, the second pipeline (12) is connected to the third pipeline (13) so that the gas discharged from the third pipeline (13) enters the cavity of the high-pressure cylinder (3) through the second pipeline (12); When the compressor is in the dual-cylinder working mode, the first pipeline (11) and the second pipeline (12) are connected in parallel so that the second pipeline (12) is connected to the evaporator (400), and the third pipeline (13) and the fourth pipeline (14) are connected in parallel so that the third pipeline (13) is connected to the condenser (200).

5. The compressor according to claim 3, characterized in that, The first conduit (11) includes a first suction tube (111) and a first distributor (112) disposed on the first suction tube (111); and / or The second conduit (12) includes a second suction pipe (121) and a second distributor (122) disposed on the second suction pipe (121); and / or The fifth pipeline (15) includes an enthalpy-increasing pipe (151) and an enthalpy-increasing component (152) disposed on the enthalpy-increasing pipe (151).

6. An air conditioning system comprising a compressor (100), a condenser (200), a flash evaporator (300), and an evaporator (400) connected in sequence, characterized in that, The compressor (100) is the compressor according to any one of claims 2 to 5.

7. The air conditioning system according to claim 6, characterized in that, The air conditioning system also includes: The first intake branch pipe (510) has its first end connected to the second end of the first pipeline (11), and the evaporator (400) is connected to the first intake branch pipe (510). The second intake branch pipe (520) has its first end connected to the second end of the second pipeline (12), and the second end of the first intake branch pipe (510) is connected to the second end of the second intake branch pipe (520), so that the second intake branch pipe (520) is connected to the evaporator (400) through the first intake branch pipe (510); A first on / off control valve (511) is disposed on the first intake branch pipe (510) to control the on / off connection between the first intake branch pipe (510) and the second intake branch pipe (520).

8. The air conditioning system according to claim 7, characterized in that, The air conditioning system also includes: A transition branch pipe (530) is provided, the first end of which is connected to the second intake branch pipe (520), and the second end of which is connected to the second end of the third pipeline (13). The second on / off control valve (531) is disposed on the transition branch pipe (530) to control the on / off connection between the transition branch pipe (530) and the second intake branch pipe (520).

9. The air conditioning system according to claim 8, characterized in that, The compressor further includes a fourth pipe (14), the first end of which is connected to the high-pressure exhaust port (401) of the pump body structure, and the second end of which is connected to the condenser (200) of the air conditioning system. The air conditioning system further includes: The second end of the first exhaust branch pipe (540) is connected to the second end of the third pipeline (13) through the first exhaust branch pipe (540); The second exhaust branch pipe (550) has its first end connected to the second end of the transition branch pipe (530); The third exhaust branch pipe (560) has its first end connected to the fourth pipe (14), and its second end, the second end of the second exhaust branch pipe (550), and the condenser (200) are connected to each other so that the airflow in the second exhaust branch pipe (550) and the third exhaust branch pipe (560) merges and flows together to the condenser (200). The third on / off control valve (551) is disposed on the second exhaust branch pipe (550).

10. The air conditioning system according to claim 6, characterized in that, The compressor further includes a fourth pipe (14), the first end of which is connected to the high-pressure exhaust port (401) of the pump body structure, and the second end of which is connected to the condenser (200) of the air conditioning system. The air conditioning system further includes: A four-way reversing valve (570) has its first valve port connected to the second end of the first pipeline (11), its second valve port connected to the second end of the second pipeline (12), and its third valve port connected to the second end of the third pipeline (13). The fourth on / off control valve (580) is disposed on the pipe body between the four-way reversing valve (570) and the second end of the first pipeline (11), and the evaporator (400) is connected to the pipe body between the fourth on / off control valve (580) and the second end of the first pipeline (11). A three-way valve (590) is connected to the fourth port of a four-way reversing valve (570), the second port of the three-way valve (590) is connected to the second end of the fourth pipeline (14), and the third port of the three-way valve (590) is connected to the condenser (200).

11. The air conditioning system according to claim 10, characterized in that, The fourth on / off control valve (580) is a one-way valve, and the outlet of the one-way valve is connected to the first valve port of the four-way reversing valve (570).

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