Compressor and heat exchange device
By installing an oil-gas separator inside the compressor housing, the high-efficiency return of lubricating oil is achieved through centrifugal force and a negative pressure channel, solving the problem of poor oil return capacity of the compressor and improving energy efficiency.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GD MIDEA AIR CONDITIONING EQUIP CO LTD
- Filing Date
- 2025-12-12
- Publication Date
- 2026-07-02
Smart Images
Figure CN2025142209_02072026_PF_FP_ABST
Abstract
Description
Compressors and heat exchange equipment
[0001] Related applications
[0002] This application claims priority to Chinese patent application No. 202411942241.8, filed on December 25, 2024, and Chinese patent application No. 202423235439.0, filed on December 25, 2024, the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of compressor technology, and in particular to a compressor and heat exchange device. Background Technology
[0004] Existing heat exchange equipment, such as air conditioners, typically uses an oil-gas separator between the compressor and the heat exchanger. This external separator separates the lubricating oil from the refrigerant gas, and the separated lubricating oil flows back into the compressor through a capillary tube. However, this method of supplying oil to the compressor results in poor oil return capacity, leading to a high oil content in the refrigerant gas discharged from the compressor. This can cause excessive accumulation of lubricating oil in the air conditioner's heat exchange lines, ultimately damaging the compressor due to insufficient oil supply. Summary of the Invention
[0005] The main objective of this application is to propose a compressor designed to address the problem of poor oil return capability in existing compressors.
[0006] To achieve the above objectives, this application proposes a compressor, comprising:
[0007] The compressor body includes a housing, a motor assembly, and a compression mechanism. The housing has a receiving cavity and a return air port and an exhaust air port communicating with the receiving cavity. The motor assembly and the compression mechanism are disposed in the receiving cavity and are drivenly connected.
[0008] An oil-gas separator is disposed within the receiving cavity and located on the exhaust path between the compression mechanism and the exhaust port. The oil-gas separator has a separation chamber and an oil-gas inlet, an exhaust port, and an oil outlet communicating with the separation chamber. The oil-gas inlet is connected to the outlet of the compression mechanism, and the exhaust port is connected to the exhaust port. The motor assembly has a negative pressure channel, the oil outlet is connected to the inlet of the negative pressure channel, and the outlet of the negative pressure channel is connected to the receiving cavity at the lower end of the motor assembly. And / or, the compression mechanism has a compression chamber, and the oil outlet is connected to the compression chamber.
[0009] In one embodiment, the motor assembly includes a rotor assembly that is drivenly connected to the compression mechanism, the oil outlet and the inlet of the negative pressure channel are located at the upper end of the motor assembly, and at least a portion of the oil outlet's projection from top to bottom falls on the rotor assembly.
[0010] In one embodiment, the motor assembly further includes a stator assembly, the stator assembly and the rotor assembly defining the negative pressure channel, with at least a portion of the negative pressure channel’s inlet projecting downwards onto the rotor assembly.
[0011] In one embodiment, the motor assembly includes a rotor assembly and a stator assembly. The upper end of the rotor assembly is provided with a negative pressure generating hole, and the oil outlet is located at the negative pressure generating hole. A negative pressure gap is formed between the rotor assembly and the stator assembly. The negative pressure generating hole communicates with the negative pressure gap to form the negative pressure channel.
[0012] In one embodiment, the rotor assembly includes a rotor core and a negative pressure generating element. The rotor core is disposed inside the stator assembly and forms the negative pressure gap with the inner wall of the stator assembly. The negative pressure generating element is disposed at the top of the rotor core and can rotate with the rotor core. The negative pressure generating element is provided with the negative pressure generating hole.
[0013] In one embodiment, the negative pressure generating hole extends axially along the rotor core, and the depth of the negative pressure generating hole is less than the diameter of the rotor core.
[0014] In one embodiment, the negative pressure generating component includes a first negative pressure component and a second negative pressure component. The second negative pressure component connects the first negative pressure component and the rotor core. The first negative pressure component has a first negative pressure hole that extends through the rotor core along its axial direction. A second negative pressure hole is formed between the first negative pressure component and the rotor core. The oil outlet, the first negative pressure hole, the second negative pressure hole, and the negative pressure gap are sequentially connected.
[0015] In one embodiment, the first negative pressure member is spaced apart from the rotor core to form the second negative pressure hole;
[0016] And / or, the first negative pressure hole is located in the middle of the first negative pressure component.
[0017] In one embodiment, there are multiple second negative pressure components, which are disposed between the first negative pressure component and the rotor core and arranged circumferentially around the first negative pressure hole to divide the second negative pressure hole into multiple negative pressure diversion channels.
[0018] And / or, the first negative pressure component and the second negative pressure component are an integral structure.
[0019] In one embodiment, the compression chamber includes an intake chamber and an exhaust chamber, the compression mechanism is provided with a negative pressure forming hole communicating with the intake chamber, and the oil outlet is located at the negative pressure forming hole and communicating with the intake chamber.
[0020] In one embodiment, the compression mechanism includes a cylinder body, a roller, and a vane. The cylinder body has the compression chamber and an air inlet and a vane groove communicating with the compression chamber. The roller is eccentrically rotatably disposed in the compression chamber, and the vane is reciprocally slidably disposed in the vane groove. One end of the vane abuts against the roller. The vane and the roller divide the compression chamber into the intake chamber and the exhaust chamber. The negative pressure forming hole is located on the side of the vane offset from the air inlet along the vertical center line of its thickness direction.
[0021] In one embodiment, the exhaust port is located at the upper end of the housing, the motor assembly is disposed between the compression mechanism and the exhaust port, a first accommodating cavity is formed between the end of the motor assembly near the exhaust port and the inner wall of the housing, and the oil-gas separator is disposed in the first accommodating cavity.
[0022] In one embodiment, the volume of the first accommodating cavity is V1, the volume of the separation cavity of the oil-gas separator is V2, and the ratio of V2 to V1 is not less than 0.1 and not greater than 0.6.
[0023] In one embodiment, the oil-gas separator includes a separation cylinder having a separation chamber, an oil-gas inlet, and a gas outlet; the oil-gas separator also includes a first oil return pipe, one end of which is connected to the separation chamber, and the other end of which is provided with the oil outlet, and the other end of which is located at the upper end of the motor assembly;
[0024] And / or, the oil-gas separator further includes a second oil return pipe, one end of which is connected to the separation chamber, the other end of which is provided with the oil outlet, and the other end of which is provided on the compression mechanism.
[0025] In one embodiment, the motor assembly includes a rotor assembly, the separator is disposed above the rotor assembly, the first oil return pipe is disposed at the bottom end of the separator, and the other end of the first oil return pipe extends into the inlet of the negative pressure channel.
[0026] And / or, the separator is an integral structure with the first return oil pipe and / or the second return oil pipe.
[0027] In one embodiment, the oil and gas inlet and a guide vane located at the side edge of the oil and gas inlet are formed on the side wall of the separation cylinder by stamping. The guide vane is disposed outside the separation chamber and extends in a direction away from the separation chamber.
[0028] In one embodiment, the separator includes a bottom, a first body, and a second body connected in sequence. The inner diameter of the first body gradually decreases from top to bottom. The side wall of the second body is provided with the oil and gas inlet and the guide vane. The top of the second body is open to form the gas outlet.
[0029] And / or, the upper edge of the oil and gas inlet is provided in a notch shape.
[0030] In one embodiment, the housing includes a housing body and a housing cover disposed on the housing body, the housing body and the housing cover forming the receiving cavity, and the housing cover having the exhaust port; the top end of the separator is open to form the air outlet, and the separator and the housing cover forming the separator cavity.
[0031] In one embodiment, the distance between the open edge of the separator cylinder and the inner wall of the housing is no greater than 0.5 mm;
[0032] And / or, the upper edge of the separator cylinder is sealed to the lower edge of the shell cover.
[0033] This application also proposes a heat exchange device, which includes a compressor as described above.
[0034] The technical solution of this application places the oil-gas separator inside the housing cavity and on the exhaust path between the compression mechanism and the exhaust port to separate the oil-gas mixture inside the housing cavity. The separated refrigerant gas is discharged from the exhaust port to the outside of the casing, while the separated lubricating oil remains inside the casing. Compared with placing the oil-gas separator outside the casing, this reduces the oil content in the refrigerant gas discharged to the compressor, which helps to reduce the flow resistance and pressure loss of the refrigerant gas, improves the energy efficiency of the compressor, and shortens the flow distance of the lubricating oil, thereby improving the oil return capacity of the compressor.
[0035] The oil-gas separator has a separation chamber and an oil-gas inlet, an air outlet, and an oil outlet connected to the separation chamber. The oil-gas inlet is connected to the outlet of the compression mechanism, and the air outlet is connected to the exhaust port. The motor assembly has a negative pressure channel, with the oil outlet connected to the inlet of the negative pressure channel and the outlet of the negative pressure channel connected to the receiving cavity at the lower end of the motor assembly. With this configuration, when the compressor is working, the compressed oil-gas mixture is discharged from the outlet of the compression mechanism. The oil-gas mixture flows into the separation chamber from the oil-gas inlet, where it rotates and flows violently. The lubricating oil in the oil-gas mixture is thrown off by centrifugal force. The lubricating oil flows onto the inner wall of the separation chamber and toward the oil outlet to separate the lubricating oil from the refrigerant gas. The separated refrigerant gas flows sequentially through the gas outlet and exhaust port before being discharged out of the casing. The pressure in the negative pressure channel is lower than the pressure at the oil outlet, allowing the separated lubricating oil to flow smoothly from the oil outlet into the negative pressure channel. The lubricating oil in the negative pressure channel flows from the outlet of the negative pressure channel to the lower end of the motor assembly, and then flows back to the oil sump at the bottom of the casing. This reduces the oil content of the discharged refrigerant gas, achieving efficient oil return of the lubricating oil and thus improving the oil return capacity of the compressor.
[0036] The oil-gas separator has a separation chamber and an oil-gas inlet, an air outlet, and an oil outlet connected to the separation chamber. The oil-gas inlet is connected to the outlet of the compression mechanism, and the air outlet is connected to the exhaust port. The compression mechanism has a compression chamber, and the oil outlet is connected to the compression chamber. With this configuration, when the compressor is working, the compressed oil-gas mixture is discharged from the outlet of the compression mechanism. The oil-gas mixture flows into the separation chamber from the oil-gas inlet and rotates violently in the separation chamber. Under the action of centrifugal force, the lubricating oil in the oil-gas mixture is thrown onto the inner wall of the separation chamber and flows towards the oil outlet, thereby achieving the separation of lubricating oil and refrigerant gas. The separated refrigerant gas flows through the air outlet and exhaust port in sequence and is discharged outside the casing. The oil outlet is connected to the compression chamber, and the separated lubricating oil can flow directly into the compression chamber from the oil outlet. The lubricating oil in the compression chamber lubricates the parts of the compression mechanism and flows back to the oil sump at the bottom of the casing. This reduces the oil content of the discharged refrigerant gas and achieves efficient oil return of lubricating oil, thereby improving the oil return capacity of the compressor.
[0037] Therefore, the technical solution of the application ensures that the oil-gas mixture after compression in the compressor can be separated by an oil-gas separator before being discharged to the outside of the casing, thereby reducing the oil content in the refrigerant gas discharged to the outside of the casing. Furthermore, the lubricating oil separated by the oil-gas separator can flow smoothly to the negative pressure channel of the motor assembly and / or the compression chamber of the compression mechanism and then flow back to the oil sump at the bottom of the casing. The technical solution of this application solves the problem of poor oil return capacity of existing compressors and improves the energy efficiency of the compressor. Attached Figure Description
[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0039] Figure 1 is a structural schematic diagram of the first embodiment of the compressor provided in this application;
[0040] Figure 2 is a cross-sectional view of the structure in Figure 1;
[0041] Figure 3 is a cross-sectional view of the structure in Figure 1;
[0042] Figure 4 is an enlarged view of point A in Figure 3;
[0043] Figure 5 is an exploded view of part of the structure in Figure 3;
[0044] Figure 6 is a schematic diagram of the oil-gas separator in Figure 5;
[0045] Figure 7 is a cross-sectional view of the structure in Figure 6;
[0046] Figure 8 is a structural schematic diagram of the negative pressure generator in Figure 5;
[0047] Figure 9 is a cross-sectional view of the structure in Figure 8;
[0048] Figure 10 is a cross-sectional view of a portion of the structure of the second embodiment of the compressor provided in this application.
[0049] Reference numerals in the attached figures: 10, Compressor; 100, Compressor body; 110, Housing; 111, Receiving cavity; 112, Return port; 113, Exhaust port; 114, First receiving cavity; 115, Main body of the housing; 116, Housing cover; 120, Motor assembly; 121, Negative pressure channel; 121a, Inlet of the negative pressure channel; 121b, Outlet of the negative pressure channel; 1211, Negative pressure generating hole; 1212, Negative pressure gap; 122, Rotor assembly; 1221, Rotor core; 1 222, Negative pressure generating element; 1223, First negative pressure element; 1224, Second negative pressure element; 1225, First negative pressure hole; 1226, Second negative pressure hole; 123, Stator assembly; 130, Compression mechanism; 130a, Outlet of compression mechanism; 131, Compression chamber; 1311, Intake chamber; 1312, Exhaust chamber; 132, Negative pressure forming hole; 133, Cylinder body; 134, Roller; 135, Sliding vane; 136, Air inlet; 200, Oil-gas separator; 210, Separation cylinder; 211, Separation chamber; 212, Oil-gas inlet; 213, Air outlet; 214, Guide vane; 215, Cylinder bottom; 216, First cylinder body; 217, Second cylinder body; 220, First oil return pipe; 221, Oil outlet; 20, Liquid storage tank.
[0050] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0052] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0053] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.
[0054] Existing heat exchange equipment, such as air conditioners, typically uses an oil-gas separator between the compressor and the heat exchanger. This external oil-gas separator separates the lubricating oil from the refrigerant gas, and the separated lubricating oil flows back into the compressor through a capillary tube. In other words, the existing oil-gas separator is external to the compressor. However, this method of supplying oil to the compressor results in poor oil return capacity, leading to a high oil content in the refrigerant gas discharged from the compressor. This can cause excessive accumulation of lubricating oil in the air conditioning system, potentially damaging the compressor due to insufficient oil supply.
[0055] To address the aforementioned problems, this application proposes a compressor capable of achieving efficient lubricating oil return.
[0056] Please refer to the embodiments in Figures 1 and 10. The compressor 10 includes a compressor body 100 and an oil-gas separator 200. The compressor body 100 includes a housing 110, a motor assembly 120, and a compression mechanism 130. The housing 110 has a receiving cavity 111 and a return port 112 and an exhaust port 113 communicating with the receiving cavity 111. The motor assembly 120 and the compression mechanism 130 are disposed in the receiving cavity 111 and are drivenly connected. The oil-gas separator 200 is disposed in the receiving cavity 111 and is located on the exhaust path between the compression mechanism 130 and the exhaust port 113. The oil-gas separator 200 has a separation cavity 211 and an oil-gas inlet 212, an exhaust port 213, and an oil outlet 221 communicating with the separation cavity 211. The oil-gas inlet 212 is connected to the outlet 130a of the compression mechanism, and the exhaust port 213 is connected to the exhaust port 113. As shown in Figures 2 to 4, the motor assembly 120 has a negative pressure channel 121, with the oil outlet 221 connected to the inlet 121a of the negative pressure channel and the outlet 121b of the negative pressure channel connected to the receiving cavity 111 at the lower end of the motor assembly 120; and / or, as shown in Figure 10, the compression mechanism 130 has a compression cavity 131, with the oil outlet 221 connected to the compression cavity 131.
[0057] It is understood that the compressor 10 can be a rotary compressor, or other types of compressors, which are not limited here. The casing 110 is provided with a return port 112 and an exhaust port 113. The return port 112 is used for refrigerant to flow in, and the exhaust port 113 is used for refrigerant to flow out. The specific number of return ports 112 and exhaust ports 113 is not limited, for example, it can be one, two, or more. The specific position of return ports 112 and exhaust ports 113 on the casing 110 is also not limited. For example, the return port 112 can be located in the lower half of the casing 110. In this design, the return port 112 is located on the outer peripheral wall of the casing 110 near the bottom. The exhaust port 113 can be located in the upper half of the casing 110. In this design, the exhaust port 113 is located at the top of the casing 110.
[0058] Furthermore, a compression mechanism 130 is disposed within the receiving cavity 111. The compression mechanism 130 is used to compress the refrigerant to the required pressure and then discharge it from the outlet 130a of the compression mechanism; the inlet of the compression mechanism is connected to the return air port 112. A motor assembly 120 is disposed within the receiving cavity 111. The motor assembly 120 is used to provide power to the compression mechanism 130 so that the compression mechanism 130 can operate. The specific positions of the motor assembly 120 and the compression mechanism 130 within the receiving cavity 111 are not limited. For example, the motor assembly 120 may be disposed between the compression mechanism 130 and the exhaust port 113, or the compression mechanism 130 may be disposed between the motor assembly 120 and the exhaust port 113. The specific arrangement can be made as needed.
[0059] Furthermore, the oil-gas separator 200 has a separation chamber 211 and an oil-gas inlet 212, an air outlet 213, and an oil outlet 221 communicating with the separation chamber 211. The specific positions of the oil-gas inlet 212, the air outlet 213, and the oil outlet 221 on the oil-gas separator 200 are not limited, for example but not limited to: the oil-gas inlet 212 can be located in the upper half of the oil-gas separator 200; the air outlet 213 can be located at the upper end of the oil-gas separator 200; and the oil outlet 221 can be located at the lower end of the oil-gas separator 200. The air outlet 213 can be orifice-shaped or open-shaped, and the specific shape is not limited here.
[0060] To ensure stable operation of the compressor 10, lubricating oil is provided inside the compressor 10. The lubricating oil in the compressor 10 not only reduces mechanical friction and wear, but also plays a role in sealing, cooling, and reducing operating noise. The high-pressure refrigerant gas discharged from the outlet 130a of the compression mechanism is mixed with lubricating oil. That is, the compressed oil-gas mixture is discharged from the outlet 130a of the compression mechanism into the receiving cavity 111, and the oil-gas mixture flows towards the exhaust port 113.
[0061] The oil-gas separator 200 is located on the exhaust path between the compression mechanism 130 and the exhaust port 113. Specifically, the oil-gas separator 200 is located between the upper end of the compression mechanism 130 and the exhaust port 113, so that the high-pressure oil-gas mixture can flow into the oil-gas separator 200 from the oil-gas inlet 212. The high-pressure oil-gas mixture flowing into the oil-gas separator 200 forms a swirling flow. Under the action of centrifugal force, the lubricating oil adheres to the cavity wall of the separation chamber 211 and flows towards the oil outlet 221 under the action of gravity, so as to achieve the separation of lubricating oil and refrigerant gas. The separated refrigerant gas flows towards the exhaust port 213 and then flows through the exhaust port 113 to be discharged outside the casing 110. That is, the oil-gas separator 200 is used to separate the oil-gas mixture. The oil-gas separator 200 utilizes the density difference between oil and gas to achieve oil-gas separation.
[0062] In Figure 2, the solid arrows indicate the flow direction of the oil-gas mixture; the double-dotted arrows indicate the flow direction of the separated refrigerant gas; and the dashed arrows indicate the flow direction of the lubricating oil.
[0063] As shown in Figures 2 to 4, in the first embodiment, the motor assembly 120 has a negative pressure channel 121. The location of the negative pressure channel 121 is not limited, for example, but not limited to: the negative pressure channel is defined on the rotor assembly of the motor assembly; or, the negative pressure channel is defined by the stator assembly and the rotor assembly of the motor assembly. In one embodiment, the negative pressure channel 121 is formed on the rotor assembly; in another embodiment, the rotor assembly has a negative pressure hole, and a negative pressure gap is formed between the stator assembly and the rotor assembly. The negative pressure hole communicates with the negative pressure gap to form the negative pressure channel 121. That is to say, the formation method and specific location of the negative pressure channel 121 are not limited here, as long as the following functions can be achieved.
[0064] The oil outlet 221 is connected to the inlet 121a of the negative pressure channel. That is, when the compressor 10 is running, the motor assembly is working, and the pressure in the negative pressure channel 121 is lower than the pressure in the oil outlet 221. The lubricating oil in the separation chamber 211 can flow out from the oil outlet 221 and flow into the negative pressure channel 121 through the inlet 121a. In other words, the separated lubricating oil can be smoothly discharged out of the separation chamber 211. The outlet 121b of the negative pressure channel is connected to the receiving cavity 111 at the lower end of the motor assembly 120. That is, the motor assembly 120 is located in the receiving cavity 111, and the lower end of the motor assembly 120 forms a lower motor cavity with the housing 110. The outlet 121b of the negative pressure channel is connected to the lower motor cavity. The lubricating oil flowing into the negative pressure channel 121 flows from the outlet 121b of the negative pressure channel to the lower motor cavity. The lubricating oil in the lower motor cavity flows back to the oil sump at the bottom of the housing 110 under the action of gravity.
[0065] To achieve rapid oil return, as shown in Figure 10, in the second embodiment, the lubricating oil separated by the oil-gas separator 200 can also flow directly into the compression chamber 131 of the compression mechanism 130 through the oil outlet 221. That is, the compression mechanism 130 has a compression chamber 131, and the oil outlet 221 is connected to the compression chamber 131, thus achieving efficient oil return of the lubricating oil and improving the oil return capacity of the compressor 10. It is understood that the solutions of the first and second embodiments can be selected as needed, or they can be set simultaneously, and the specifics are not limited here.
[0066] The technical solution of this application places the oil-gas separator 200 in the receiving cavity 111 and on the exhaust path between the compression mechanism 130 and the exhaust port 113 to separate the oil-gas mixture in the receiving cavity 111. The separated refrigerant gas is discharged from the exhaust port 113 to the outside of the housing 110, while the separated lubricating oil remains in the housing 110. Compared with the oil-gas separator 200 being located outside the housing 110, this reduces the oil content in the refrigerant gas discharged to the compressor 10, which helps to reduce the flow resistance and pressure loss of the refrigerant gas, improves the energy efficiency of the compressor 10, and shortens the flow distance of the lubricating oil, thereby improving the oil return capacity of the compressor 10.
[0067] The oil-gas separator 200 has a separation chamber 211 and an oil-gas inlet 212, an air outlet 213, and an oil outlet 221 connected to the separation chamber 211. The oil-gas inlet 212 is connected to the outlet 130a of the compression mechanism, and the air outlet 213 is connected to the exhaust port 113. The motor assembly 120 has a negative pressure channel 121. The oil outlet 221 is connected to the inlet 121a of the negative pressure channel, and the outlet 121b of the negative pressure channel is connected to the receiving cavity 111 at the lower end of the motor assembly 120. With this configuration, when the compressor 10 is working, the outlet 130a of the compression mechanism discharges the compressed oil-gas mixture. The oil-gas mixture flows into the separation chamber 211 from the oil-gas inlet 212 and rotates violently in the separation chamber 211. Under centrifugal force, the lubricating oil is thrown onto the inner wall of the separation chamber 211 and flows toward the oil outlet 221 to separate the lubricating oil from the refrigerant gas. The separated refrigerant gas flows through the gas outlet 213 and the exhaust port 113 in sequence and is discharged out of the casing 110. The pressure in the negative pressure channel 121 is lower than the pressure in the oil outlet 221, so that the separated lubricating oil can flow smoothly from the oil outlet 221 into the negative pressure channel 121. The lubricating oil in the negative pressure channel 121 flows from the outlet 121b of the negative pressure channel to the lower end of the motor assembly 120, and then flows back to the oil sump at the bottom of the casing 110. This reduces the oil content of the discharged refrigerant gas and achieves efficient oil return of the lubricating oil, thereby improving the oil return capacity of the compressor 10.
[0068] The oil-gas separator 200 has a separation chamber 211 and an oil-gas inlet 212, an air outlet 213, and an oil outlet 221 connected to the separation chamber 211. The oil-gas inlet 212 is connected to the outlet 130a of the compression mechanism, and the air outlet 213 is connected to the exhaust port 113. The compression mechanism 130 has a compression chamber 131, and the oil outlet 221 is connected to the compression chamber 131. With this configuration, when the compressor 10 is working, the outlet 130a of the compression mechanism discharges the compressed oil-gas mixture. The oil-gas mixture flows into the separation chamber 211 from the oil-gas inlet 212 and rotates violently in the separation chamber 211. The lubricating oil in the oil-gas mixture is subjected to centrifugal force. Under the action of the gas, the lubricating oil is thrown onto the inner wall of the separation chamber 211 and flows toward the oil outlet 221 to separate the lubricating oil from the refrigerant gas. The separated refrigerant gas flows through the gas outlet 213 and the exhaust port 113 in sequence and is discharged out of the casing 110. The oil outlet 221 is connected to the compression chamber 131, and the separated lubricating oil can flow directly into the compression chamber 131 from the oil outlet 221. The lubricating oil in the compression chamber 131 lubricates the parts of the compression mechanism 130 and flows back to the oil sump at the bottom of the casing 110. This reduces the oil content of the discharged refrigerant gas and achieves efficient oil return of the lubricating oil, thereby improving the oil return capacity of the compressor 10.
[0069] Therefore, the technical solution of the application ensures that the oil-gas mixture after compression in the compressor 10 can be separated by the oil-gas separator 200 before being discharged to the outside of the casing 110, thereby reducing the oil content in the refrigerant gas discharged to the outside of the casing 110. Furthermore, the lubricating oil separated by the oil-gas separator 200 can flow smoothly to the negative pressure channel 121 of the motor assembly 120 and / or the compression chamber 131 of the compression mechanism 130 and then flow back to the oil sump at the bottom of the casing 110. The technical solution of this application solves the problem of poor oil return capacity of the existing compressor 10 and improves the energy efficiency of the compressor 10.
[0070] Please refer to Figures 2 to 5. In one embodiment of this application, the motor assembly 120 includes a rotor assembly 122, which is drivenly connected to the compression mechanism 130. The oil outlet 221 and the inlet 121a of the negative pressure channel are located at the upper end of the motor assembly 120, and at least a portion of the oil outlet 221 is projected from top to bottom onto the rotor assembly 122.
[0071] It is understandable that the rotation of the rotor assembly 122 causes a negative pressure zone to be formed in the negative pressure channel 121. This solution limits the oil outlet 221 and the inlet 121a of the negative pressure channel to be located at the upper end of the motor assembly 120, and at least part of the oil outlet 221 is projected from top to bottom onto the rotor assembly 122, so that the oil outlet 221 is close to the negative pressure zone and the suction force formed by the negative pressure is strong. The separated lubricating oil can flow smoothly from the oil outlet 221 into the negative pressure channel 121 under the action of gravity and the suction force formed by the negative pressure. This reduces the flow resistance and improves the smoothness of the lubricating oil flowing into the negative pressure channel 121.
[0072] In one embodiment, the motor assembly 120 further includes a stator assembly 123, the stator assembly 123 and the rotor assembly 122 defining the negative pressure channel 121, with at least a portion of the negative pressure channel’s inlet 121a projecting downwards onto the rotor assembly 122.
[0073] It is understood that the stator assembly 123 and the rotor assembly 122 define a negative pressure channel 121. The specific location of the negative pressure channel 121 is not limited. For example, at least a portion of the negative pressure channel 121 may be located on the rotor assembly 122 and / or at least a portion of the negative pressure channel 121 may be located on the stator assembly 123. Alternatively, a partial negative pressure channel 121 may be formed between the rotor assembly 122 and the stator assembly 123. The rotor assembly 122 may be located inside the stator assembly 123, i.e., the inner rotor. Of course, the rotor assembly 122 may also be located outside the stator assembly 123, i.e., the outer rotor. The specific location is not limited. At least part of the negative pressure channel inlet 121a is projected from top to bottom onto the rotor assembly 122, which helps to shorten the distance between the negative pressure channel inlet 121a and the rotor assembly 122. The rotor assembly 122 is more likely to form a negative pressure zone when it rotates. That is, the oil outlet 221 and the negative pressure channel inlet 121a are closer to the negative pressure zone, thereby further improving the smoothness of lubricating oil flowing into the negative pressure channel 121.
[0074] Please refer to Figures 3 to 5. In one embodiment, the motor assembly 120 includes a rotor assembly 122 and a stator assembly 123. The upper end of the rotor assembly 122 is provided with a negative pressure generating hole 1211. The oil outlet 221 is located at the negative pressure generating hole 1211. A negative pressure gap 1212 is formed between the rotor assembly 122 and the stator assembly 123. The negative pressure generating hole 1211 communicates with the negative pressure gap 1212 to form the negative pressure channel 121.
[0075] It is understandable that when the rotor assembly 122 rotates, a negative pressure zone is more easily formed in the negative pressure generating hole 1211 at the upper end of the rotor assembly 122 itself, and a negative pressure zone can also be formed in the negative pressure gap 1212 between the rotor assembly 122 and the stator assembly 123. The negative pressure generating hole 1211 and the negative pressure gap 1212 are connected, and the negative pressure zones formed by the two are connected, which makes the suction of the negative pressure channel 121 stronger, and the flow resistance of lubricating oil from the oil outlet 221 into the negative pressure channel 121 is smaller, thereby improving the smoothness of lubricating oil flowing into the negative pressure channel 121.
[0076] Referring to Figures 3 and 5, in one embodiment, the rotor assembly 122 includes a rotor core 1221 and a negative pressure generator 1222. The rotor core 1221 is disposed inside the stator assembly 123 and forms the negative pressure gap 1212 between it and the inner wall of the stator assembly 123. The negative pressure generator 1222 is disposed at the top of the rotor core 1221 and can rotate with the rotor core 1221. The negative pressure generator 1222 is provided with the negative pressure generating hole 1211.
[0077] It is understood that the negative pressure generating element 1222 and the rotor core 1221 can be fixedly connected, or the negative pressure generating element 1222 and the rotor core 1221 can be detachably connected; the specific connection is not limited here. For example, the rotor core 1221 and the negative pressure generating element 1222 are an integral structure, or the negative pressure generating element 1222 is connected to the rotor core 1221 through a connector, which can be a rivet.
[0078] Furthermore, the negative pressure generating element 1222 is located at the top of the rotor core 1221 and has a negative pressure generating hole 1211. The rotor core 1221 rotates and drives the negative pressure generating element 1222 to rotate synchronously. The rotation of the rotor core 1221 causes a negative pressure zone to be formed in the negative pressure gap 1212 between the rotor core 1221 and the stator assembly 123. The rotation of the negative pressure generating element 1222 causes a negative pressure zone to be formed in its own negative pressure generating hole 1211. The negative pressure zones formed by the two are connected. The negative pressure generating hole 1211 is located at the top of the rotor core 1221 so that the oil outlet 221 of the oil-gas separator 200 can communicate with the negative pressure generating hole 1211. For example, the oil-gas separator 200 can be located at the upper end of the negative pressure generating element 1222, and the oil outlet 221 can be located at the bottom end of the oil-gas separator 200. This allows the lubricating oil in the separation chamber 211 to flow smoothly from the oil outlet 221 into the negative pressure channel 121 under the action of gravity and the suction force formed by the negative pressure, thereby improving the smoothness of the lubricating oil flowing into the negative pressure channel 121.
[0079] In one embodiment, the negative pressure generating hole 1211 extends axially along the rotor core 1221, and the depth of the negative pressure generating hole 1211 is less than the diameter of the rotor core 1221. This arrangement ensures that the top of the negative pressure generating hole 1211 is close to the rotor core 1221. The suction force of the negative pressure zone formed by the synchronous rotation of the negative pressure generating element 1222 and the rotor core 1221 can draw lubricating oil from the oil outlet 221 into the negative pressure channel 121, thus shortening the distance between the oil outlet 221 and the rotor core 1221 and improving the smoothness of lubricating oil flow into the negative pressure channel 121.
[0080] Please refer to Figures 4, 5, 8, and 9. In one embodiment, the negative pressure generating element 1222 includes a first negative pressure element 1223 and a second negative pressure element 1224. The second negative pressure element 1224 connects the first negative pressure element 1223 and the rotor core 1221. The first negative pressure element 1223 is provided with a first negative pressure hole 1225 that extends through the rotor core 1221 axially. A second negative pressure hole 1226 is formed between the first negative pressure element 1223 and the rotor core 1221. The oil outlet 221, the first negative pressure hole 1225, the second negative pressure hole 1226, and the negative pressure gap 1212 are sequentially connected.
[0081] It is understandable that the second negative pressure component 1224 is located between the first negative pressure component 1223 and the rotor core 1221. When the first negative pressure component 1223 and the second negative pressure component 1224 rotate synchronously with the rotor core 1221, the first negative pressure hole 1225, which is axially connected to the rotor core 1221, easily forms a negative pressure zone. The second negative pressure hole 1226 formed between the first negative pressure component 1223 and the rotor core 1221 also easily forms a negative pressure zone. Under the suction force formed by the negative pressure zone, the lubricating oil from the oil outlet 221 can flow smoothly from top to bottom into the first negative pressure hole 1225, and then flow along the second negative pressure hole 1226 and the negative pressure gap 1212 to the lower end of the motor assembly 120, thereby achieving efficient return of lubricating oil.
[0082] In one embodiment, the first negative pressure member 1223 is spaced apart from the rotor core 1221 to form the second negative pressure hole 1226. It is understood that the negative pressure gap 1212 is annularly arranged, and the outer periphery of the first negative pressure member 1223 is spaced apart from the rotor core 1221, so that the outer periphery of the second negative pressure hole 1226 is also annularly arranged. The first negative pressure hole 1225 is located inside the outer periphery of the second negative pressure hole 1226. This arrangement allows the lubricating oil flowing into the first negative pressure member 1223 to flow along its circumference into the second negative pressure hole 1226, and then along the circumference of the outer periphery of the second negative pressure hole 1226 into the annularly arranged negative pressure gap 1212. This allows the lubricating oil flowing out from the oil outlet 221 to disperse and flow back to the lower end of the motor assembly 120, improving the uniformity of the lubricating oil return.
[0083] In one embodiment, the first negative pressure hole 1225 is located in the middle of the first negative pressure member 1223. This arrangement helps to improve the uniformity of the lubricating oil flow from the first negative pressure hole 1225 to its circumference, that is, it improves the dispersion of the lubricating oil flow and avoids the accumulation of lubricating oil in the negative pressure channel 121. In one embodiment, the projection of the first negative pressure hole 1225 from top to bottom falls on the exact center of the rotor core 1221; alternatively, the projection of the inlet 121a of the negative pressure channel from top to bottom falls on the exact center of the motor assembly 120.
[0084] Referring to Figures 8 and 9, in one embodiment, there are multiple second negative pressure components 1224. These components are positioned between the first negative pressure component 1223 and the rotor core 1221, and are arranged circumferentially around the first negative pressure hole 1225 to divide the second negative pressure hole 1226 into multiple negative pressure diversion channels. This arrangement allows the multiple second negative pressure components 1224 to guide and divert the lubricating oil flowing from the first negative pressure hole 1225. The second negative pressure hole 1226 is divided into multiple negative pressure diversion channels by the multiple second negative pressure components 1224. The lubricating oil flowing from the first negative pressure hole 1225 is dispersed into multiple streams along these channels, and these streams then flow into the annularly arranged negative pressure gap 1212, and then back to the lower end of the motor assembly 120 along the annularly arranged negative pressure gap 1212, thereby achieving efficient lubricating oil return. It can be seen that the multiple second negative pressure components 1224 improve the uniformity of lubricating oil flow into the negative pressure gap 1212, that is, improve the smoothness of lubricating oil flow.
[0085] In one embodiment, the first negative pressure component 1223 and the second negative pressure component 1224 are an integral structure. This arrangement improves the structural strength of the negative pressure generating component 1222 and facilitates manufacturing and assembly.
[0086] Please refer to Figure 10. In the second embodiment, the compression chamber 131 includes an intake chamber 1311 and an exhaust chamber 1312. The compression mechanism 130 is provided with a negative pressure forming hole 132 that communicates with the intake chamber 1311. The oil outlet 221 is located at the negative pressure forming hole 132 and communicates with the intake chamber 1311.
[0087] It is understandable that the negative pressure forming hole 132 connects the oil outlet 221 and the suction chamber 1311. When the compressor 10 is working, the pressure in the suction chamber 1311 is relatively low, forming a negative pressure zone relative to the separation chamber 211 and the oil outlet 221 of the oil-gas separator 200. The suction force formed by the negative pressure zone draws the lubricating oil from the oil outlet 221 into the suction chamber 1311, thereby achieving direct oil return of the lubricating oil and improving the oil return capacity of the compressor 10.
[0088] Referring to Figure 10, in one embodiment, the compression mechanism 130 includes a cylinder body 133, a roller 134, and a slide 135. The cylinder body 133 has the compression chamber 131 and an air inlet 136 and a slide groove communicating with the compression chamber 131. The roller 134 is eccentrically rotatably disposed in the compression chamber 131, and the slide 135 is reciprocally slidably disposed in the slide groove. One end of the slide 135 abuts against the roller 134. The slide 135 and the roller 134 divide the compression chamber 131 into the intake chamber 1311 and the exhaust chamber 1312. The negative pressure forming hole 132 is located on the side of the slide 135 along its thickness direction, perpendicular to the vertical center line, biased towards the air inlet 136.
[0089] Understandably, the motor assembly 120 and the compression mechanism 130 are connected via a crankshaft. When the compressor 10 is working, the rotor assembly 122 of the motor assembly 120 drives the crankshaft to rotate, and the crankshaft drives the roller 134 to rotate eccentrically within the cylinder body 133. One end of the vane 135 abuts against the roller 134, dividing the compression chamber 131 of the cylinder body 133 into an intake chamber 1311 and an exhaust chamber 1312. As the roller 134 rotates continuously, the volumes of the intake chamber 1311 and the exhaust chamber 1312 change continuously, allowing refrigerant gas at normal or low pressure to enter the intake chamber 1311 and be compressed to form high-pressure refrigerant gas, which is then discharged from the exhaust chamber 1312. The exhaust chamber 1312 is connected to the outlet 130a of the compression mechanism, thereby achieving the compression function.
[0090] Furthermore, as shown in Figure 10, the vertical centerline of the slide plate 135 along its thickness direction is L, and the negative pressure forming hole 132 is located on the side of the centerline L of the slide plate 135 that is biased towards the air inlet 136. This arrangement makes the distance between the end of the negative pressure forming hole 132 away from the intake chamber 1311 and the air inlet 136 relatively close. That is, the negative pressure forming hole 132 is set close to the intake chamber 1311 on the cylinder body 133, which helps to shorten the depth of the negative pressure forming hole 132 and also makes the negative pressure forming hole 132 easier to process and form on the cylinder body 133, thus optimizing the structure of the compression mechanism 130 and facilitating manufacturing.
[0091] Referring to Figure 3, in one embodiment, the exhaust port 113 is located at the upper end of the housing 110, the motor assembly 120 is disposed between the compression mechanism 130 and the exhaust port 113, a first accommodating cavity 114 is formed between the end of the motor assembly 120 near the exhaust port 113 and the inner wall of the housing 110, and the oil-gas separator 200 is disposed in the first accommodating cavity 114.
[0092] Understandably, the exhaust port 113 is located at the upper end of the housing 110, allowing the separated refrigerant gas to be smoothly discharged from the upper end of the housing 110 to the outside of the housing 110. The compression mechanism 130 is located below the motor assembly 120, and the oil-gas mixture discharged by the compression mechanism 130 flows upward. The oil-gas separator 200 is located in the first receiving cavity 114 above the motor assembly 120, making it easy for the oil-gas mixture to flow into the separation cavity 211 of the oil-gas separator 200 for separation.
[0093] In one embodiment, the volume of the first accommodating cavity 114 is V1, and the volume of the separation cavity 211 of the oil-gas separator 200 is V2. The ratio of V2 to V1 is not less than 0.1 and not greater than 0.6. It is understood that the ratio of V2 to V1 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, etc., and is not specifically limited here. When the volume of the separation cavity 211 is small and the ratio of V2 to V1 is small, the oil-gas separation efficiency of the oil-gas separator 200 is low. When the ratio of V2 to V1 is too large, the oil-gas separator 200 occupies too much space in the upper part of the motor assembly 120. At this time, the turbulence of the oil-gas mixture discharged from the compression mechanism 130 outside the oil-gas separator 200 will increase sharply, thereby reducing the oil-gas separation efficiency. This solution ensures that the separation chamber 211 has sufficient separation space by limiting the ratio of the volume of the separation chamber 211 to the volume of the first accommodating chamber 114 above the motor assembly 120 to between 0.1 and 0.6. This allows the oil-gas separator 200 to have high oil-gas separation efficiency, while also ensuring that the oil level of the lubricating oil in the compressor 10 is at an appropriate position, thus ensuring the stable operation of the compressor 10.
[0094] Please refer to Figures 4 to 7. The oil-gas separator 200 includes a separation cylinder 210, which has a separation chamber 211, an oil-gas inlet 212, and a gas outlet 213. The oil-gas separator 200 also includes a first oil return pipe 220, one end of which is connected to the separation chamber 211, and the other end of which is provided with the oil outlet 221. The other end of the first oil return pipe 220 is located at the upper end of the motor assembly 120.
[0095] And / or, the oil-gas separator 200 further includes a second oil return pipe (not shown), one end of which is connected to the separation chamber 211, the other end of which is provided with the oil outlet 221, and the other end of which is provided on the compression mechanism 130.
[0096] It is understood that the cross-section of the separator 210 along the radial direction of the motor assembly 120 can be circular, and the number of oil and gas inlets 212 can be one, two, or more, without any specific limitation. When there are multiple oil and gas inlets 212, they can be arranged in an array or symmetrically on the side wall of the separator 210, and the height of the multiple oil and gas inlets 212 is the same. This helps to improve the symmetrical distribution of the flow field of the oil and gas separator 200, and helps to balance the impact force of the oil and gas mixture flowing into the separation chamber 211 on the inner wall of the chamber, so that the oil and gas separator 200 can operate smoothly.
[0097] Furthermore, the outlet 213 can be located at the top of the separator 210 to facilitate the outward flow of the separated refrigerant gas. When the oil-gas separator 200 includes a first oil return pipe 220, one end of the first oil return pipe 220 can be located at the bottom of the separator 210 and connected to the separator chamber 211. The other end of the first oil return pipe 220 has an oil outlet 221 located at the upper end of the motor assembly 120, thereby facilitating the connection between the oil outlet 221 and the negative pressure channel 121 of the motor assembly 120. The first oil return pipe 220 is relatively short, which is beneficial to the smooth discharge of lubricating oil. In one embodiment, the first oil return pipe 220 is located above the motor assembly 120, that is, the entire first oil return pipe 220 is located above the motor assembly 120.
[0098] In another embodiment, when the oil-gas separator 200 includes a second oil return pipe, one end of the second oil return pipe can be located at the bottom of the separator cylinder 210 and communicate with the separator chamber 211. The other end of the second oil return pipe passes through the gap between the motor assembly 120 and the housing 110 and communicates with the compression chamber 131 of the compression mechanism 130. The other end of the second oil return pipe is located below the motor assembly 120, so that the lubricating oil at the oil outlet 221 can flow directly into the compression chamber 131, and the structure inside the housing 110 is compact.
[0099] In one embodiment, the separating cylinder 210 is integrally formed with the first return oil pipe 220 and / or the second return oil pipe. This configuration means that when the oil-gas separator 200 includes the separating cylinder 210 and the first return oil pipe 220, the separating cylinder 210 and the first return oil pipe 220 are integrally formed; when the oil-gas separator 200 includes the separating cylinder 210 and the second return oil pipe, the separating cylinder 210, the first return oil pipe 220, and the second return oil pipe are integrally formed. In other words, the structure of the oil-gas separator 200 of this application has multiple embodiments, which are not limited here.
[0100] In one embodiment, the motor assembly 120 includes a rotor assembly 122, the separator 210 is disposed above the rotor assembly 122, the first oil return pipe 220 is disposed at the bottom end of the separator 210, and the other end of the first oil return pipe 220 extends into the inlet 121a of the negative pressure channel. With this configuration, when the compressor 10 is operating, a negative pressure zone is formed within the negative pressure channel 121. The other end of the first oil return pipe 220 extending into the inlet 121a of the negative pressure channel shortens the distance between the oil outlet 221 and the negative pressure channel 121, allowing the lubricating oil in the first oil return pipe 220 to flow smoothly into the negative pressure channel 121 under the suction force formed by the negative pressure zone, thus improving the smoothness of lubricating oil flowing from the first oil return pipe 220 into the negative pressure channel 121.
[0101] Please refer to Figures 4, 6 and 7. In one embodiment, the oil and gas inlet 212 and the guide vane 214 located at the side edge of the oil and gas inlet 212 are formed on the side wall of the separation cylinder 210 by stamping. The guide vane 214 is disposed outside the separation cavity 211 and extends in a direction away from the separation cavity 211.
[0102] Understandably, the separator 210 uses a stamping process to form the oil-gas inlet 212 and the guide vane 214 on its side wall, making the manufacturing process of the separator 210 simple and easy to form. The guide vane 214 is located outside the separator 211 and at the side edge of the oil-gas inlet 212. The guide vane 214 is used to guide the oil-gas mixture into the oil-gas inlet 212. The guiding direction of the guide vane 214 for the oil-gas mixture is tangential to the inner side wall of the separator 210, so that the oil-gas mixture easily forms a swirling flow after flowing into the separator 211. Under the action of centrifugal force, the swirling oil-gas mixture is easily separated into lubricating oil and refrigerant gas.
[0103] Referring to Figures 6 and 7, in one embodiment, the separating cylinder 210 includes a bottom cylinder 215, a first cylinder body 216, and a second cylinder body 217 connected in sequence. The inner diameter of the first cylinder body 216 gradually decreases from top to bottom. The side wall of the second cylinder body 217 is provided with the oil and gas inlet 212 and the guide vane 214. The top of the second cylinder body 217 is open to form the gas outlet 213; and / or, the upper edge of the oil and gas inlet 212 is notched.
[0104] Understandably, the second cylinder 217, the first cylinder 216, and the bottom cylinder 215 are arranged sequentially from top to bottom. The oil-gas inlet 212 and the guide vane 214 are located on the side wall of the second cylinder 217. The oil-gas mixture is guided by the guide vane 214 and enters the second cylinder 217 through the oil-gas inlet 212. The inner diameter of the first cylinder 216 gradually decreases from top to bottom, which is equivalent to the first cylinder 216 being inclined from bottom to top outward. The inclined first cylinder 216 makes it easier for the oil-gas mixture to form a swirling flow in the separation chamber 211, and it can also concentrate the lubricating oil, thus improving the oil-gas separation efficiency.
[0105] Furthermore, the top of the second cylinder 217 is open to form the air outlet 213. This arrangement helps to reduce the amount of material used in the separator 210, reduce manufacturing costs, and also reduces the resistance to the outward discharge of refrigerant gas, so that the separated refrigerant gas can be smoothly discharged from the open end of the second cylinder 217 to the exhaust port 113.
[0106] In addition, the upper edge of the oil and gas inlet 212 is notched, which prevents the upper edge of the oil and gas inlet 212 from blocking the entry of the oil and gas mixture. It also makes the oil and gas inlet 212 easier to process and shape on the separator 210, reducing the manufacturing difficulty.
[0107] Referring to Figures 3 to 5, in one embodiment, the housing 110 includes a housing body 115 and a housing cover 116 covering the housing body 115. The housing body 115 and the housing cover 116 enclose the receiving cavity 111, and the housing cover 116 is provided with the exhaust port 113. The top end of the separator 210 is open to form the exhaust port 213. The separator 210 and the housing cover 116 enclose the separator cavity 211. This arrangement, where the housing body 115 and the separator 210 share the same housing cover 116, results in high utilization of the housing cover 116, fully utilizing the structure of the housing 110. This facilitates increasing the volume of the receiving cavity 111, saving space, thereby improving the oil separation efficiency of the oil-gas separator 200, and reducing the manufacturing difficulty and production cost of the separator 210.
[0108] In one embodiment, the distance between the open edge of the separator 210 and the inner wall of the housing 110 is no more than 0.5 mm. This arrangement makes the gap between the open edge of the separator 210 and the inner wall of the housing 110 small or non-existent, so as to prevent the oil-gas mixture flowing into the separator 211 and / or the refrigerant gas separated in the separator 211 from flowing back to the outside of the separator 211 along the gap between them.
[0109] In one embodiment, the upper edge of the separator 210 and the lower edge of the cover 116 are sealed together, thus ensuring that the oil-gas mixture flowing into the separator 211 and / or the refrigerant gas separated in the separator 211 will not flow back to the outside of the separator 211 through the gap between them, thereby improving the reliability of the compressor 10.
[0110] Please refer to Figures 2 and 3. In one embodiment, the pressure outside the separation chamber 211 and between the inner peripheral wall of the housing 110 and the outer peripheral wall of the oil-gas separator 200 is P0; the pressure inside the separation chamber is P1; and the pressure at the inlet of the negative pressure channel is P2. P0, P1, and P2 satisfy the following relationship: P0>P1>P2.
[0111] In one embodiment, ε1 is the local flow resistance coefficient, U is the flow velocity of the oil-gas mixture at the oil-gas inlet 212, and ρ is the density of the oil-gas mixture at the oil-gas inlet 212; P0 and P1 satisfy the following relationship:
[0112] In one embodiment, ε2 is the rotational centrifugal force coefficient, R is the diameter of rotor assembly 122, ω is the rotational speed of rotor assembly 122, and ρ is the density of the oil-gas mixture at oil-gas inlet 212. The relationships between P0 and P2 are as follows:
[0113] Among them, ε1 is related to the shape and size of the oil and gas inlet 212; U is inversely proportional to the inlet area of the oil and gas inlet 212 and directly proportional to the operating frequency of the compressor; ε2 is related to the structure of the inlet 121a of the negative pressure channel; by designing the shape and size of the oil and gas inlet 212, the size of ε1 and U can be controlled; by designing the shape and size of the inlet 121a of the negative pressure channel, the size of ε2 can be controlled, thereby achieving P0>P1>P2.
[0114] It is understandable that, according to the above formula, the difference between P0 and P1 and the difference between P0 and P2 are positively correlated with the square root of the rotational speed of the rotor assembly 122. This indicates that the rotor assembly 122 of the compressor in this solution can ensure that the lubricating oil separated by the oil-gas separator 200 can return normally, whether the compressor is running at high speed or low speed. In other words, the compressor in this solution has a strong oil return capability.
[0115] This application also proposes a heat exchange device, which includes a compressor as described above. The specific structure of the compressor is as described in the above embodiments. Since this heat exchange device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0116] As shown in Figure 2, in one embodiment, the heat exchange device includes a liquid storage tank 20. The outlet of the liquid storage tank 20 is connected to the return gas port 112 of the compressor 10 through a connecting pipe. The liquid storage tank is used to separate gaseous and liquid refrigerant so that the compressor can normally draw in gaseous refrigerant for compression and delivery.
[0117] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. A compressor, wherein, The compressor includes: The compressor body includes a housing, a motor assembly, and a compression mechanism. The housing has a receiving cavity and a return air port and an exhaust air port communicating with the receiving cavity. The motor assembly and the compression mechanism are disposed in the receiving cavity and are drivenly connected. An oil-gas separator is disposed within the receiving cavity and located on the exhaust path between the compression mechanism and the exhaust port. The oil-gas separator has a separation cavity and an oil-gas inlet, an exhaust port, and an oil outlet communicating with the separation cavity. The oil-gas inlet is communicating with the outlet of the compression mechanism, and the exhaust port is communicating with the exhaust port. The motor assembly has a negative pressure channel, the oil outlet is connected to the inlet of the negative pressure channel, and the outlet of the negative pressure channel is connected to the receiving cavity at the lower end of the motor assembly; And / or, the compression mechanism has a compression chamber, and the oil outlet is connected to the compression chamber.
2. The compressor as claimed in claim 1, wherein, The motor assembly includes a rotor assembly, which is drivenly connected to the compression mechanism. The oil outlet and the inlet of the negative pressure channel are located at the upper end of the motor assembly, and at least a portion of the oil outlet's projection from top to bottom falls on the rotor assembly.
3. The compressor as described in claim 2, wherein, The motor assembly also includes a stator assembly, the stator assembly and the rotor assembly defining the negative pressure channel, and at least a portion of the negative pressure channel entrance is projected from top to bottom onto the rotor assembly.
4. The compressor as claimed in claim 1, wherein, The motor assembly includes a rotor assembly and a stator assembly. The upper end of the rotor assembly is provided with a negative pressure generating hole. The oil outlet is located at the negative pressure generating hole. A negative pressure gap is formed between the rotor assembly and the stator assembly. The negative pressure generating hole communicates with the negative pressure gap to form the negative pressure channel.
5. The compressor as claimed in claim 4, wherein, The rotor assembly includes a rotor core and a negative pressure generating element. The rotor core is located inside the stator assembly and forms the negative pressure gap with the inner wall of the stator assembly. The negative pressure generating element is located at the top of the rotor core and can rotate with the rotor core. The negative pressure generating element is provided with the negative pressure generating hole.
6. The compressor as claimed in claim 5, wherein, The negative pressure generating hole extends axially along the rotor core, and the depth of the negative pressure generating hole is less than the diameter of the rotor core.
7. The compressor as claimed in claim 5, wherein, The negative pressure generating component includes a first negative pressure component and a second negative pressure component. The second negative pressure component connects the first negative pressure component and the rotor core. The first negative pressure component has a first negative pressure hole that extends through the rotor core along its axial direction. A second negative pressure hole is formed between the first negative pressure component and the rotor core. The oil outlet, the first negative pressure hole, the second negative pressure hole, and the negative pressure gap are connected in sequence.
8. The compressor as claimed in claim 7, wherein, The first negative pressure component is spaced apart from the rotor core to form the second negative pressure hole; And / or, the first negative pressure hole is located in the middle of the first negative pressure component.
9. The compressor as claimed in claim 7, wherein, There are multiple second negative pressure components. Multiple second negative pressure components are disposed between the first negative pressure component and the rotor core and are arranged circumferentially around the first negative pressure hole to divide the second negative pressure hole into multiple negative pressure diversion channels. And / or, the first negative pressure component and the second negative pressure component are an integral structure.
10. The compressor as claimed in claim 1, wherein, The compression chamber includes an intake chamber and an exhaust chamber. The compression mechanism is provided with a negative pressure forming hole that communicates with the intake chamber. The oil outlet is located at the negative pressure forming hole and communicates with the intake chamber.
11. The compressor of claim 10, wherein, The compression mechanism includes a cylinder body, a roller, and a vane. The cylinder body has a compression chamber and an air inlet and a vane groove communicating with the compression chamber. The roller is eccentrically rotatably disposed in the compression chamber, and the vane is reciprocally slidably disposed in the vane groove. One end of the vane abuts against the roller. The vane and the roller divide the compression chamber into an intake chamber and an exhaust chamber. The negative pressure forming hole is located on the side of the vane along its thickness direction, perpendicular to the center line of the vane, biased towards the air inlet.
12. The compressor as claimed in claim 1, wherein, The exhaust port is located at the upper end of the housing. The motor assembly is located between the compression mechanism and the exhaust port. A first accommodating cavity is formed between the end of the motor assembly near the exhaust port and the inner wall of the housing. The oil-gas separator is located in the first accommodating cavity.
13. The compressor as claimed in claim 12, wherein, The volume of the first accommodating cavity is V1, the volume of the separating cavity is V2, and the ratio of V2 to V1 is not less than 0.1 and not greater than 0.
6.
14. The compressor according to any one of claims 1 to 13, wherein, The oil-gas separator includes a separation cylinder, which has a separation chamber, an oil-gas inlet, and a gas outlet. The oil-gas separator also includes a first oil return pipe, one end of which is connected to the separation chamber, and the other end of which is provided with the oil outlet. The other end of the first oil return pipe is located at the upper end of the motor assembly. And / or, the oil-gas separator further includes a second oil return pipe, one end of which is connected to the separation chamber, the other end of which is provided with the oil outlet, and the other end of which is provided on the compression mechanism.
15. The compressor as claimed in claim 14, wherein, The motor assembly includes a rotor assembly, the separator is located above the rotor assembly, the first oil return pipe is located at the bottom end of the separator, and the other end of the first oil return pipe extends into the inlet of the negative pressure channel. And / or, the separator is an integral structure with the first return oil pipe and / or the second return oil pipe.
16. The compressor of claim 14, wherein, The oil and gas inlet and the guide vane located at the side edge of the oil and gas inlet are formed on the side wall of the separation cylinder by stamping. The guide vane is located outside the separation chamber and extends in a direction away from the separation chamber.
17. The compressor of claim 16, wherein, The separation cylinder includes a bottom cylinder, a first cylinder body, and a second cylinder body connected in sequence. The inner diameter of the first cylinder body gradually decreases from top to bottom. The oil and gas inlet and the guide vane are provided on the side wall of the second cylinder body. The top of the second cylinder body is open to form the gas outlet. And / or, the upper edge of the oil and gas inlet is provided in a notch shape.
18. The compressor of claim 14, wherein, The housing includes a housing body and a housing cover on the housing body. The housing body and the housing cover enclose the receiving cavity. The housing cover is provided with the exhaust port. The top of the separation cylinder is open to form the air outlet. The separation cylinder and the housing cover enclose the separation cavity.
19. The compressor of claim 18, wherein, The distance between the open edge of the separator cylinder and the inner wall of the housing is no greater than 0.5 mm; And / or, the upper edge of the separator cylinder is sealed to the lower edge of the shell cover.
20. A heat exchange device, wherein, The heat exchange device includes a compressor as described in any one of claims 1 to 19.