Compressor oil return structure, compressor and air conditioner

Abstract

The present invention provides a compressor oil return structure, a compressor, and an air conditioner. The compressor oil return structure comprises a cover, a housing, a stator, a bracket, and a crankshaft. An oil storage chamber is provided within the bracket, a bearing A is provided between the bracket and the crankshaft, and a first cavity is enclosed between the bracket and the crankshaft. The oil storage chamber is located radially outward of the first cavity and is communicable with the first cavity. Oil discharged from the stator can enter the oil storage chamber, and at least a portion of the oil in the oil storage chamber can flow into the first cavity. The oil in the first cavity can lubricate the bearing A. This structure overcomes the drawbacks of the prior art, such as the inability to fully utilize the oil storage chamber space and the susceptibility of the oil storage structure to the influence of the centrifugal separation structure, resulting in a low oil storage capacity or the removal of separated lubricating oil by the refrigerant.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a compressor oil return structure, a compressor and an air conditioner. Background Art

[0002] The aluminum alloy scroll compressor for automobiles does not have a stable oil pool inside the compressor to supply oil to the mechanical lubrication parts of the compressor's internal oil pumping system. Instead, it relies on the compressor's suction refrigerant to carry the lubricating oil, and the exhaust gas centrifugal separation of the refrigerant and lubricating oil is followed by a throttling return oil design for the lubricating oil. Therefore, the oil return efficiency of the exhaust gas centrifugal separation is crucial to the performance and reliability of the compressor. The existing centrifugal separation structure is very mature, and the simple centrifugal separation structure has a high separation efficiency, which can fully meet the requirements of separating most of the lubricating oil from the refrigerant. However, with regard to the return of the separated lubricating oil to the compressor, the existing technical solutions all have major problems, mainly focusing on:

[0003] 1. The oil return lubrication structure of the existing technology directly returns the high-temperature lubricating oil after centrifugal separation of the exhaust gas to the lubrication parts inside the compressor. The lubricating oil temperature is high and the lubrication effect is poor;

[0004] 2. The position of the oil return storage structure is unreasonable: the oil storage chamber and the centrifugal separation structure are arranged in parallel, so the maximum liquid level of the oil storage chamber can only reach the bottom height of the centrifugal separation structure. Otherwise, the liquid will enter the exhaust pipe from the bottom inlet of the centrifugal separator. Therefore, the oil storage chamber space of this structure cannot be fully utilized. In addition, the oil storage structure is easily affected by the centrifugal separation structure, resulting in a small amount of oil stored in the actual oil storage structure or the separated lubricating oil being carried away by the refrigerant;

[0005] 3. The oil return structure directly adopts a throttling structure to connect the high-pressure to the low-pressure or medium-pressure lubrication parts. Due to the large throttling pressure difference, when there is a large pressure difference during actual operation, the throttling is insufficient, resulting in high-pressure gas entering the low-pressure or medium-pressure parts, affecting the performance of the compressor; under small pressure difference conditions, the return flow is too small, and the lubricating oil separated by the centrifugal separation structure cannot be returned to the compressor in time. The excess lubricating oil in the separation structure is carried away by the refrigerant again, resulting in poor heat exchange effect of the system.

[0006] Patent No. US6511530B2 discloses a structure for exhaust oil separation and storage inside a compressor. An exhaust chamber 13a, an oil-gas separation chamber, and a lubricating oil storage chamber are provided between the back of the compressor's fixed scroll and the exhaust cover. The oil storage chamber returns to the compressor's internal suction chamber through an oil return channel, thereby realizing the circulation of lubricating oil inside the compressor. However, there are the following problems: in order not to affect the oil separation efficiency of the separation chamber, the oil storage chamber must be set below the oil separation chamber (in the direction of gravity) and the highest liquid level in the oil storage chamber must be lower than the oil outlet of the oil separation chamber, otherwise the lubricating oil enters the separation chamber and affects the oil separation effect. Therefore, the problem with this type of oil storage chamber technology is that the oil storage volume is small, and excess lubricating oil will still be carried into the refrigeration system by the refrigerant. Otherwise, in order to increase the volume of the oil storage chamber, the axial height of the oil storage chamber needs to be increased, which will bring about problems such as large size, heavy weight, and high production cost of the compressor. At the same time, the pressure in this type of oil storage chamber is the exhaust high pressure. Affected by the exhaust fluctuation of the pump body, the exhaust pressure fluctuates greatly, resulting in the liquid level in the oil storage chamber being difficult to stabilize and also fluctuating greatly with the exhaust.

[0007] Patent number CN107605726A discloses another oil return structure. The oil return passage in the compressor exhaust cover connects the stator and bracket, and a throttling channel is set in the bracket. The lubricating oil in the oil return passage is introduced into the lubrication cavity in the bracket to achieve lubrication of the bearings in the lubrication cavity. Although the lubricating oil is directly introduced into the key lubricating components in the compressor, the lubrication cavity is a accommodating cavity with limited space. Most of the lubricating oil in the oil return passage cannot be returned to the compressor in time, resulting in a large amount of lubricating oil entering the refrigeration system with the exhaust gas, affecting the heat exchange effect of the system. Summary of the Invention

[0008] Therefore, the present invention provides a compressor oil return structure, a compressor and an air conditioner, which can overcome the defects in the prior art that the oil storage cavity space cannot be fully utilized, the oil storage structure is easily affected by the centrifugal separation structure, resulting in a small amount of oil stored in the actual oil storage structure or the separated lubricating oil is carried away by the refrigerant.

[0009] To address the above-mentioned issues, the present invention provides a compressor oil return structure comprising: a cover, a housing, a stator, a bracket, and a crankshaft. An oil reservoir is provided within the bracket, a bearing A is disposed between the bracket and the crankshaft, and a first cavity is enclosed between the bracket and the crankshaft. The oil reservoir is located radially outward of the first cavity and is communicable with the first cavity. Oil discharged from the stator enters the oil reservoir, and at least a portion of the oil in the oil reservoir flows into the first cavity, where the oil in the first cavity lubricates the bearing A.

[0010] In some embodiments, a second cavity for air intake is provided in the shell, the bracket is located in the second cavity, and the outer wall of the oil storage cavity can exchange heat with the gas in the first cavity.

[0011] In some embodiments, an oil separation chamber is provided in the cover body, and the oil storage chamber can be connected to the oil separation chamber through an oil inlet channel; the oil inlet channel includes a first channel and a second channel, the first channel is provided on the bracket, and the second channel is provided on the stator, one end of the first channel is connected to the oil storage chamber, and the other end is connected to the second channel, and the second channel is connected to the oil separation chamber.

[0012] In some embodiments, the compressor oil return structure also includes a moving plate, a sealing gasket is provided between the moving plate and the bracket, a connecting channel b is provided on the sealing gasket, one end of the connecting channel b is connected to the second channel, and the other end is connected to the first channel, and a throttling structure is provided in any one or more of the connecting channel b, the second channel and the first channel to create a pressure difference between the pressure in the oil storage chamber and the pressure in the oil distribution chamber.

[0013] In some embodiments, the bracket is provided with an opening on one side facing the axial direction of the crankshaft, and the opening is connected to the oil storage chamber; the compressor oil return structure also includes a first cover plate, which is provided at the opening so that the oil storage chamber can be sealed by the first cover plate.

[0014] In some embodiments, an oil drainage channel is provided on the first cover plate, one end of the oil drainage channel is connected to the oil storage chamber, and the other end is connected to the second cavity; the oil drainage channel includes an oil drainage groove and a third channel, the oil drainage groove is provided on the end surface of the first cover plate, and the third channel is provided on the side wall of the first cover plate, and the third channel is connected to the oil drainage groove. After the second cavity inhales gas, the gas can drive the oil discharged from the oil drainage channel to move.

[0015] In some embodiments, a fourth channel is provided on the end surface of the first cover plate, and one end of the fourth channel can be connected to the first cavity, and the other end of the fourth channel can be connected to the oil storage cavity.

[0016] In some embodiments, a throttling channel a is provided on the end surface of the first cover plate, one end of the fourth channel is connected to the throttling channel a, and the other end is connected to the oil storage cavity, and both ends of the throttling channel a are connected to the first cavity.

[0017] In some embodiments, a fifth channel is provided on the bracket, one end of the fifth channel is connected to the oil storage cavity, and the other end of the fifth channel is connected to the first cavity.

[0018] In some embodiments, a throttle member is provided in the fifth channel, and the throttle member can throttle and reduce the pressure of the oil in the fifth channel, so as to generate a pressure difference between the oil storage chamber and the first cavity.

[0019] In some embodiments, a second cover plate is provided in the oil storage chamber, and the second cover plate divides the space of the oil storage chamber into an oil storage chamber and a buffer chamber. A third through hole is provided on the second cover plate, and one end of the third through hole is connected to the oil storage chamber and the other end is connected to the buffer chamber. The buffer chamber can be connected to the oil separation chamber.

[0020] In some embodiments, a second buffer cavity is provided between the stator plate and the cover body, and one end of the second buffer cavity can be connected to the oil separation cavity, and the other end of the second buffer cavity can be connected to the oil storage cavity.

[0021] In some embodiments, an exhaust chamber is provided between the stator plate and the cover body, the exhaust chamber is communicated with the exhaust port of the stator plate, the exhaust chamber is communicated with the oil separation chamber, the second buffer chamber has a first inlet and a second inlet, the first inlet is communicated with the oil separation chamber, the first inlet can pass the liquid separated by the oil separation chamber into the buffer chamber, the second inlet is communicated with the exhaust chamber, the second inlet can pass the liquid in the exhaust chamber into the buffer chamber.

[0022] In some embodiments, the oil separation chamber has an air outlet, which can discharge the gas discharged from the stator disc out of the cover body. The oil separation chamber also has a pressure-stabilizing channel, one end of which is connected to the oil separation chamber and the other end is connected to the second buffer chamber. The pressure-stabilizing channel can transport the gas in the second buffer chamber to the air outlet so as to be discharged out of the cover body from the air outlet.

[0023] In some embodiments, the pressure-stabilizing channel includes a first through hole and a second through hole, one end of the first through hole is connected to the second buffer cavity, and the other end is connected to the second through hole, and the second through hole is connected to the air outlet.

[0024] In some embodiments, the compressor oil return structure further includes a fixing member, which is connected between the inner wall and the outer wall of the bracket, and there are multiple fixing members, which are arranged at intervals along the circumference of the bracket so that the oil storage cavity can be divided into several cavities through the fixing members.

[0025] The present invention also provides a compressor, comprising the above-mentioned compressor oil return structure.

[0026] The present invention also provides an air conditioner comprising the above-mentioned compressor.

[0027] The present invention provides a compressor oil return structure, a compressor, and an air conditioner. An oil storage chamber is provided in a bracket. The oil storage chamber is not subject to the centrifugal separation structure and will not be carried away by the refrigerant, thereby ensuring the utilization rate of the oil storage chamber space. As the low-temperature refrigerant flows through the outside of the bracket, the high-temperature oil-gas mixture discharged from the stator is separated in the oil separation chamber to obtain high-temperature lubricating oil. After the high-temperature lubricating oil flows from the oil separation chamber into the oil storage chamber, the low-temperature refrigerant outside the bracket cools the high-temperature lubricating oil in the oil storage chamber. A portion of the cooled lubricating oil is discharged through the oil discharge channel and enters the lubricating parts in the compressor to form an oil return structure. The other portion enters the first cavity to lubricate the bearing a and ensure the rotation of the crankshaft. The oil storage chamber stores the refluxed high-temperature lubricating oil and is arranged near a low-temperature area so that the low-temperature refrigerant cools the high-temperature lubricating oil in the oil storage chamber and then flows back to other parts to be lubricated inside the compressor. The oil temperature is reduced, taking away more heat from the lubricating parts, which can greatly improve the lubricating effect of the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the first prior art;

[0029] Figure 2 It is a structural diagram of the second prior art;

[0030] Figure 3 This is a structural schematic diagram of a compressor oil return structure according to an embodiment of the present invention;

[0031] Figure 4 This is a partial enlarged view of the oil return structure of the compressor according to an embodiment of the present invention;

[0032] Figure 5 This is a structural schematic diagram of a bracket in a compressor oil return structure according to an embodiment of the present invention;

[0033] Figure 6 This is a structural schematic diagram of the first cover plate in the compressor oil return structure according to an embodiment of the present invention;

[0034] Figure 7 Schematic diagram of the layout of the seventh channel in the compressor oil return structure according to an embodiment of the present invention;

[0035] Figure 8 Schematic diagram of the structure of a throttling member in a compressor oil return structure according to an embodiment of the present invention;

[0036] Figure 9 is a cross-sectional view of a throttling member in a compressor oil return structure according to an embodiment of the present invention;

[0037] Figure 10 is a schematic diagram of the layout of the seventh channel in another embodiment of the present invention;

[0038] Figure 11This is a structural schematic diagram of a first cover plate in another embodiment of the present invention;

[0039] Figure 12 is a schematic diagram of the layout of the fourteenth channel in another embodiment of the present invention;

[0040] Figure 13 A schematic diagram of the layout of the second cover plate in another embodiment of the present invention;

[0041] Figure 14 This is a schematic structural diagram of a second cover plate in another embodiment of the present invention;

[0042] Figure 15 This is a partially enlarged view of the compressor oil return structure in another embodiment of the present invention.

[0043] The reference numerals indicate:

[0044] 1. Cover; 2. Static plate; 201. Second channel; 202. First through hole; 3. Moving plate; 301. Lubrication chamber air inlet channel; 4. Bracket; 401. Fixing member; 402. First channel; 403. Fifth channel; 5. Housing; 6. Drive motor; 7. Crankshaft; 701. Lubrication chamber oil discharge channel; 8. Housing air intake; 9. Second cavity; 10. Oil storage chamber; 101. Oil discharge channel; 102. Oil inlet channel; 103. First buffer chamber; 11. First cavity; 12. Pump body air intake chamber; 13. Pump body compression chamber; 14. Exhaust chamber; 15. Oil distribution chamber; 151. First Inlet; 152, oil chamber air inlet channel; 153, oil chamber exhaust port; 154, oil chamber exhaust transition port; 155, second through hole; 156, second inlet; 16, air outlet; 17, first cover plate; 171, sealing fitting part a; 172, sealing fitting part b; 173, oil drain groove; 174, third channel; 175, fourth channel; 176, throttling channel a; 18, sealing gasket; 181, connecting channel b; 19, bearing a; 20, bearing b; 21, throttling member; 22, second cover plate; 221, third through hole; 23, oil outlet; 24, second buffer chamber. DETAILED DESCRIPTION

[0045] See also Figure 1As shown, the compressor mechanism of prior art a mainly includes a compressor cover body 1, a stator 2, a rotor 3 and a bracket 4. An exhaust chamber 14, an oil separation chamber 15 and an oil storage chamber 10 are formed between the compressor stator 2 and the cover body 1. The oil storage chamber 10 is relatively arranged below the oil separation chamber 15. The highest oil storage liquid level in the oil storage chamber 10 corresponds to the oil outlet hole 23 at the bottom of the oil separation chamber 15. The oil storage chamber 10 of the prior art is set in the high-temperature exhaust area. The lubricating oil in the oil storage chamber 10 is the exhaust high temperature. The high-temperature oil directly enters the lubrication part after throttling, resulting in a decrease in the lubrication effect. At the same time, the structural position setting of the exhaust chamber 14, the oil separation chamber 15 and the oil storage chamber 10 has the problem that the cover body 1 needs to be set very large, resulting in a large size and heavy weight of the compressor, and the axial oil separation length of the oil separation chamber 15 is limited, resulting in a decrease in the actual oil separation efficiency.

[0046] See also Figure 2 As shown, the compressor of prior art b includes a housing 5, a bracket 4, a moving plate 3, a static plate 2, a cover body 1 and a drive motor 6. By arranging an oil return channel in the compressor cover body 1, the static plate 2 and the bracket 4, the lubricating oil separated by the exhaust oil separation structure of the cover body 1 is returned to the two bearings in the first cavity 11 (bearing lubrication cavity) in the bracket 4. Since the high-temperature lubricating oil of the exhaust gas directly enters the lubricating components after throttling, the lubrication effect is reduced. At the same time, since the first cavity 11 (bearing lubrication cavity) is a space for accommodating moving parts, the cavity space is limited, and there are moving parts eccentric sleeves and moving plates 3, which affect the oil storage capacity of the cavity, resulting in the separated lubricating oil not being able to be completely stored in the compressor, and the excess lubricating oil will still be carried away by the exhaust gas into the system, affecting the heat exchange of the system.

[0047] See also Figure 3-15 As shown, according to an embodiment of the present invention, a compressor oil return structure is provided, including: a cover body 1, a shell body 5, a stator 2, a bracket 4 and a crankshaft 7, a second cavity 9 for air intake is provided in the shell body 5, the bracket 4 is located in the second cavity 9, an oil storage cavity 10 is provided inside the bracket 4, the oil discharged by the stator 2 can enter the oil storage cavity 10, a bearing a19 is provided between the bracket 4 and the crankshaft 7, a first cavity 11 is enclosed between the bracket 4 and the crankshaft 7, the oil storage cavity 10 is located radially outside the first cavity 11, and the oil storage cavity 10 can be connected with the first cavity 11; the oil-gas mixture discharged by the stator 2 can be separated from the oil and gas in the cover body 1, the separated oil can enter the oil storage cavity 10, the outer wall of the oil storage cavity 10 can exchange heat with the gas in the first cavity 9, at least part of the oil in the oil storage cavity 10 can flow into the first cavity 11, and the oil in the first cavity 11 can lubricate the bearing a19.

[0048] See also Figure 3As shown, an oil separation structure is provided in the oil separation chamber 15, and the compressor casing includes a cover body 1 and a shell body 5. Both the cover body 1 and the shell body 5 are hollow structures. After the cover body 1 and the shell body 5 are connected, a shell with a hollow cavity structure is formed. A moving disk 3 is provided between the stator 2 and the bracket 4. A crankshaft 7 is rotatably connected to the bracket 4. The crankshaft 7 can drive the moving disk 3 to move, so that the moving disk 3 cooperates with the stator 2 to produce a compression effect. A drive motor 6 is provided on the crankshaft 7, and the drive motor 6 can drive the crankshaft 7 to rotate. A shell air intake 8 is also provided on the shell body 5. The shell air intake 8 is located away from the stator 2 and close to the end of the crankshaft 7 away from the bracket 4. The second cavity 9 is located near the shell air intake 8. An air outlet 16 is provided on the cover body 1. The air outlet 16 is connected to the oil separation chamber 15. Above the exhaust port of the stator 2 It is an exhaust chamber 14, which is connected to the oil distribution chamber 15. A pump body compression chamber 13 is provided between the movable plate 3 and the stator plate 2. A pump body suction chamber 12 is also provided between the movable plate 3 and the stator plate 2. A bearing a19 is provided between the bracket 4 and the crankshaft. A bearing b20 is provided between the end of the crankshaft 7 away from the bracket 4 and the housing 5. A lubrication chamber oil discharge channel 701 is provided on the crankshaft 7. One end of the lubrication chamber oil discharge channel 701 is connected to the first cavity 11 (bearing lubrication chamber), and the other end passes through the end of the crankshaft 7 away from the bracket 4. The first cavity 11 (bearing lubrication chamber) is discharged through the lubrication chamber oil discharge channel 701 to lubricate the bearing b20 with lubricating oil. The lubricating oil discharged through the lubrication chamber oil discharge channel 701 can also be cooled by the refrigerant in the second cavity 9 (motor low-pressure chamber). A first cavity 11 (bearing lubrication cavity) is formed between the inner wall of the bracket 4 and the crankshaft 7. The first cavity 11 is used to store lubricating oil and lubricate bearings b20 and a19. The refrigerant enters the second cavity 9 (motor low-pressure cavity) in the compressor shell through the shell suction port 8 on the compressor to cool the drive motor. Figure 3The dynamic plate 3 and the static plate 2 are arranged on the right side of the driving motor 6, and the lubricating oil then flows from left to right with the refrigerant. The refrigerant (refrigerant) after cooling the motor reaches the oil storage chamber 10 on the right side of the driving motor 6, cools the lubricating oil in the oil storage chamber 10, and finally reaches the pump body suction chamber 12. Under the action of the pump body suction chamber 12, it enters the pump body compression chamber 13, and reaches the exhaust chamber 14 after compression is completed. The lubricating oil and the refrigerant are separated in the oil separation chamber 15, and the separated lubricating oil enters the oil storage chamber 10 from the oil inlet channel 102. Finally, the lubricating oil in the oil storage chamber 10 enters the lubrication part inside the compressor through the oil discharge channel 101, thereby realizing the storage and circulation of the lubricating oil inside the compressor. In this technical solution, since the low-temperature refrigerant flows through the outside of the bracket 4, the high-temperature oil-gas mixture discharged from the stator 2 is separated in the oil separation chamber 15 to obtain high-temperature lubricating oil. After the high-temperature lubricating oil flows from the oil separation chamber 15 into the oil storage chamber 10, the low-temperature refrigerant outside the bracket 4 has a cooling effect on the high-temperature lubricating oil in the oil storage chamber 10. A portion of the cooled lubricating oil is discharged through the oil discharge channel 101, contacts the low-temperature refrigerant flowing through, undergoes secondary cooling, and flows with the low-temperature refrigerant into the lubricating parts in the compressor to complete the lubrication effect. It is then discharged through the exhaust port of the stator 2 and enters the oil separation chamber 15. After the gas-liquid separation is completed in the oil separation chamber 15, it flows into the oil storage chamber 10 to form an oil return structure. Another portion of the cooled lubricating oil enters the second cavity 9 to lubricate the bearing a19. The oil temperature is reduced, taking away more heat from the lubricating parts, which can greatly improve the lubricating effect of the lubricating oil.

[0049] In a specific embodiment, see Figure 4 and Figure 5As shown, an oil separation chamber 15 is provided in the cover body 1, and the oil storage chamber 10 can be connected to the oil separation chamber 15 through an oil inlet channel 102; the oil inlet channel 102 includes a first channel 402 and a second channel 201, the first channel 402 is provided on the bracket 4, and the second channel 201 is provided on the stator 2, one end of the first channel 402 is connected to the oil storage chamber 10, and the other end is connected to the second channel 201, and the second channel 201 is connected to the oil separation chamber 15. In this technical solution, the second channel 201 is provided through the stator 2, and the oil inlet channel 102 completes the entry of lubricating oil from the oil separation chamber 15 into the oil storage chamber 10. The throttling member 21 does not need to be provided separately on the oil inlet channel 102, and the pressure in the oil storage chamber 10 is made to be a high pressure slightly lower than the pressure of the oil separation chamber 15 by throttling and reducing the pressure of the fluid in such a channel. The oil inlet passage 102 enables lubricating oil to enter the oil storage chamber from the oil separation chamber. Because the size of the oil inlet passage 102 designed in the compressor is limited and the diameter of the oil inlet passage 102 is small, the liquid passing through the oil inlet passage 102 can produce a pressure-reducing and throttling effect, thereby making the pressure in the oil storage chamber lower than the pressure in the oil separation chamber. The oil inlet passage 102 enables lubricating oil to enter the oil storage chamber from the oil separation chamber. Because the size of the oil inlet passage 102 designed in the compressor is limited and the diameter of the oil inlet passage 102 is small, the liquid passing through the oil inlet passage 102 can produce a pressure-reducing and throttling effect, thereby making the pressure in the oil storage chamber lower than the pressure in the oil separation chamber.

[0050] In a specific embodiment, a movable plate 3 is further included. A sealing gasket 18 is disposed between the movable plate 3 and the bracket 4. A connecting channel b181 is provided on the sealing gasket 18. One end of the connecting channel b181 connects to the second channel 201, and the other end connects to the first channel 402. A throttling structure is provided within one or more of the connecting channel b181, the second channel 201, and the first channel 402 to create a pressure differential between the pressure within the oil storage chamber 10 and the pressure within the oil distribution chamber 15. In this technical solution, the sealing gasket 18 is used to seal the first cavity 11. The connecting channel b181 also ensures a pressure-reducing and throttling effect in the oil inlet channel 102. The throttling structure can take the form of a throttling channel or a throttling element 21.

[0051] In a specific embodiment, see Figure 4 As shown, the bracket 4 is provided with an opening on one side facing the axis of the crankshaft 7, which is connected to the oil reservoir 10. The compressor oil return structure also includes a first cover plate 17, which is disposed at the opening to seal the oil reservoir 10. In this technical solution, the bracket 4 has a single opening facing the drive motor 6, and the first cover plate 17 seals the oil reservoir 10, ensuring better and more reliable oil storage in the oil reservoir 10.

[0052] In a specific embodiment, an oil drain channel 101 is provided on the first support cover plate 17. One end of the oil drain channel 101 connects to the oil storage chamber 10 and the other end connects to the second cavity 9. The oil drain channel 101 includes an oil drain groove 173 and a third channel 174. The oil drain groove 173 is provided on the end surface of the first cover plate 17, and the third channel 174 is provided on the side wall of the first cover plate 17. The third channel 174 is connected to the oil drain groove 173. When the second cavity 9 draws in gas, the gas drives the oil discharged from the oil drain channel 101. In this technical solution, the third channel 174 throttles and reduces the pressure of the liquid flowing in the oil drain groove 173, creating a pressure differential between the second cavity 9 and the oil storage chamber 10, facilitating oil drainage from the oil storage chamber 10. The first cover plate 17 has a sealing mating portion a171 and a sealing mating portion b172. The sealing mating portion a171 and the sealing mating portion b172 cooperate with the corresponding positions on the bracket 4 to complete the sealing of the oil storage chamber 10. The sealing mating portion a171, the sealing mating portion b172 and the bracket 4 are both interference fit. The lubricating oil discharged from the oil storage chamber 10 moves along with the gas sucked into the second cavity 9 to reach the lubrication position, thereby realizing the recycling of the lubricating oil. The third channel 174 throttles and reduces the pressure of the liquid flowing in the oil drain groove 173, so that a pressure difference is formed between the second cavity 9 and the oil storage chamber 10, facilitating the drainage of the oil from the oil storage chamber 10. The sealing mating portion a171 on the outer periphery of the first cover plate 17 is provided with a third channel 174. The third channel 174 connects the oil drain groove 173 and the oil storage chamber 10. The lubricating oil discharged from the oil storage chamber 10 moves along with the gas sucked into the second cavity 9 to reach the lubrication position, thereby realizing the recycling of the lubricating oil. The third channel 174 throttles and reduces the pressure of the liquid flowing in the oil drain groove 173, creating a pressure differential between the second cavity 9 and the oil storage cavity 10, facilitating the draining of the oil from the oil storage cavity 10. A third channel 174 is provided on the sealing mating portion a171 on the outer periphery of the first cover plate 17, connecting the oil drain groove 173 and the second cavity 9 (the motor low-pressure cavity). This allows the lubricating oil in the oil storage cavity 10 to enter the second cavity 9 through the oil drain channel 101 and then enter the pump body compression cavity 13 through the pump body suction cavity 12 for lubrication. The third channel 174 uses a smaller diameter channel to achieve a throttling effect. The sealing mating portions a171 and b172 are used to seal the oil storage cavity and the low-pressure cavity. Furthermore, the methods for achieving fastening and sealing are not limited to those described above. Reliable sealing can be achieved using existing technologies such as screws, sealing rings, or gaskets.

[0053] In a specific embodiment, a fourth channel 175 is provided on the end surface of the first cover plate 17, one end of the fourth channel 175 can be connected to the first cavity 11, and the other end is connected to the oil storage cavity 10; specifically, a throttling channel a176 is provided on the end surface of the first cover plate 17, one end of the fourth channel 175 is connected to the throttling channel a176, and the other end is connected to the oil storage cavity 10, and both ends of the throttling channel a176 are connected to the first cavity 11. In this technical solution, the throttling and pressure-reducing effect of the throttling channel a176 is utilized to generate a pressure difference between the first cavity 11 and the oil storage cavity 10, ensuring that the liquid in the oil storage cavity 10 can smoothly flow into the first cavity 11, thereby lubricating the crankshaft 7. Both ends of the throttling channel a176 are connected to the first cavity 11, increasing the oil intake of the first cavity 11. The fourth channel 175 is provided on the first cover plate 17 along the radial direction of the first cover plate 17, and passes through the sealing fitting part a171 and the sealing fitting part b172. See. Figure 12 As shown, an arc-shaped throttling channel a 176 is provided on the first cover plate 17 to achieve throttling, and is provided as a channel with double outlets to increase the amount of lubricating oil entering the lubricating cavity.

[0054] In a specific embodiment, a fifth channel 403 is provided on the bracket 4, and one end of the fifth channel 403 is connected to the oil storage chamber 10, and the other end is connected to the first cavity 11. Specifically, a throttling member 21 is provided in the fifth channel 403, and the throttling member 21 can throttle and reduce the pressure of the oil in the fifth channel 403, so that a pressure difference is generated between the oil storage chamber 10 and the first cavity 11. In this technical solution, the lubricating oil flows into the first cavity 11 from the oil storage chamber 10 through the fifth channel 403. The pressure difference between the oil storage chamber 10 and the first cavity 11 is further guaranteed by the throttling member 21, so that the oil can stably and continuously enter the first cavity. After passing through the throttling member 21, the lubricating oil is reduced in pressure to a certain pressure in the middle between exhaust and intake. The throttling member 21 is a structure that can have obvious active pressure reduction, rather than being similar to a woolen channel. See Figures and Figure 9 As shown, the throttle member 21 is cylindrical, with an outer channel wound around its outer surface. An inner channel is located in the center of the throttle member 21. The inner and outer channels have smaller diameters, diverting the lubricating oil flowing in the oil inlet channel 102. The smaller diameters of the inner and outer channels further achieve throttling and pressure reduction. By configuring the fourth channel 175 on the first cover plate 17 or the bracket 4 or the fifth channel 403 on the bracket 4 as a small channel, pressure reduction and throttling are achieved, eliminating the need for a separate throttling component.

[0055] In a specific embodiment, a second cover plate 22 is provided in the oil storage chamber 10. The second cover plate 22 divides the space of the oil storage chamber 10 into an oil storage chamber and a first buffer chamber 103. A third through hole 221 is provided on the second cover plate 22. One end of the third through hole 221 is connected to the oil storage chamber and the other end is connected to the first buffer chamber 103. The first buffer chamber 103 can be connected to the oil separation chamber 15. In this technical solution, the pressure in the oil storage chamber is further reduced by the first buffer chamber 103, so that the oil storage chamber is stably in a low-pressure state. The space of the oil storage chamber 10 is divided into the first buffer chamber 103 and the oil storage chamber by providing the second cover plate 22. The second cover plate 22 is provided with a third through hole 221 for connecting the oil storage chamber. The pressure in the first buffer chamber 103 can be the same as that of the oil storage chamber 10 or there can be a pressure difference. The first buffer chamber 103 is directly connected to the oil separation chamber 15, and no active pressure reduction structure is set on the oil inlet channel 102. The third through hole 221 connecting the first buffer chamber 103 and the oil storage chamber 10 is set with a pressure reduction structure. The pressure of the oil storage chamber is lower than the pressure of the first buffer chamber 103; the pressure of the first buffer chamber 103 is equivalent to that of the oil separation chamber 15, which is the exhaust high pressure or the medium pressure after throttling.

[0056] In a specific embodiment, a second buffer chamber 24 is provided between the stator plate 2 and the cover body 1. One end of the second buffer chamber 24 is connected to the oil separation chamber 15, and the other end is connected to the oil storage chamber 10. Specifically, an exhaust chamber 14 is provided between the stator plate 2 and the cover body 1. The exhaust chamber 14 is connected to the exhaust port of the stator plate 2 and is connected to the oil separation chamber 15. The second buffer chamber 24 has a first inlet 151 and a second inlet 156. The first inlet 151 is connected to the oil separation chamber 15 and can pass the liquid separated by the oil separation chamber 15 into the second buffer chamber 24. The second inlet 156 is connected to the exhaust chamber 14 and can pass the liquid in the exhaust chamber 14 into the second buffer chamber 24. In this technical solution, the first inlet 151 introduces the liquid stored in the exhaust chamber 14 into the second buffer chamber 24, and the second inlet 156 draws the liquid in the oil separation chamber 15 out of the buffer chamber, thereby ensuring the oil return rate of the lubricating oil. The second buffer chamber 24 is located in the high-pressure and high-temperature exhaust region, specifically in the area surrounded by the back pressure of the stator plate 2 and the cover 1. The oil storage chamber 10 is located in the low-pressure and low-temperature intake region. The first inlet 151 and the second inlet 156 are configured as small holes, making it easy for lubricating oil to enter but difficult for gas to enter. The first inlet 151 introduces the liquid stored in the exhaust chamber 14 into the second buffer chamber 24, and the second inlet 156 draws the liquid in the oil separation chamber 15 out of the second buffer chamber 24, ensuring the oil return rate of the lubricating oil. Figure 4As shown, the pump body compression chamber 13 and the first cavity 11 (bearing lubrication chamber) are connected through the lubrication chamber air inlet channel 301, so that the pressure in the first cavity 11 is an intermediate pressure between the exhaust pressure and the suction pressure. The oil in the pump body compression chamber 13 partially enters the first cavity 11 through the lubrication chamber air inlet channel 301 to achieve lubrication of the bearing a19. The lubrication chamber air inlet channel 301 is opened on the moving disk 3, and the oil separation structure includes an oil separation chamber exhaust transition port 154 and an oil separation chamber exhaust port 153. The oil separation chamber exhaust transition port 154, the oil separation chamber exhaust port 153 and the air outlet 16 are connected. The oil separation chamber 15 and the exhaust chamber 14 are connected through the oil separation chamber air inlet channel 152, and the oil separation chamber air inlet channel 152 is arranged on the internal structure of the cover body 1.

[0057] In one specific embodiment, the oil separation chamber 15 has an outlet 16, which can discharge gas exhausted from the stator plate 2 out of the cover body 1. The oil separation chamber 15 also has a pressure-stabilizing channel, one end of which connects to the oil separation chamber 15 and the other end connects to the second buffer chamber 24. The pressure-stabilizing channel can transport gas within the second buffer chamber 24 to the outlet 16 for discharge out of the cover body 1 through the outlet 16. Specifically, the pressure-stabilizing channel includes a first through hole 202 and a second through hole 155. The first through hole 202 connects to the second buffer chamber 24 at one end and to the second through hole 155 at the other end, and the second through hole 155 connects to the outlet 16. In this technical solution, the refrigerant within the second buffer chamber 24 is promptly discharged through the pressure-stabilizing channel. The outlet 16 has a higher fluid flow rate, while the second buffer chamber 24 has a lower fluid flow rate, creating a certain pressure differential across the pressure-stabilizing channel. This allows the pressure within the second buffer chamber 24 to be controlled to a lower pressure region slightly below the exhaust pressure. The oil level in the second buffer chamber 24 can be increased, and the pressure in the oil separation chamber 15 can be pushed into the second buffer chamber 24 to form a higher level. The pressure-stabilizing channel can promptly discharge the refrigerant in the second buffer chamber 24. The pressure-stabilizing channel is located on the oil separation chamber exhaust transition port 154 and has a higher fluid flow rate. While the fluid flow rate in the second buffer chamber 24 is lower, a certain pressure differential can be formed across the pressure-stabilizing channel. This means that the pressure in the second buffer chamber 24 can be controlled to a lower pressure range slightly below the exhaust pressure, thereby increasing the oil level in the second buffer chamber 24 and pushing the pressure in the oil separation chamber 15 into the second buffer chamber 24 to form a higher level.

[0058] In a specific embodiment, a fixing member 401 is further included. The fixing member 401 is connected and disposed between the inner and outer walls of the bracket 4. There are multiple fixing members 401, spaced apart along the circumference of the bracket 4, so that the oil storage chamber 10 can be divided into several chambers. Specifically, the fixing member 401 can strengthen the inner wall of the bracket 4 and also divide the oil storage chamber 10 into several functional chambers. For example, a buffer chamber, an oil collecting chamber, a pressure maintenance chamber, etc., are connected to each other in sequence.

[0059] The present invention also provides a compressor, comprising the above-mentioned compressor oil return structure.

[0060] The present invention also provides an air conditioner comprising the above-mentioned compressor.

[0061] The present invention relates to a compressor oil return structure, a compressor and an air conditioner. An oil storage chamber 10 is provided between the compressor rotor 3 and the bracket 4. The oil storage chamber 10 is located in the low-temperature suction area of ​​the compressor. The oil storage chamber 10 stores the high-temperature lubricating oil separated from the exhaust gas and refluxed. By being arranged close to the low-temperature area, the low-temperature refrigerant cools the high-temperature lubricating oil in the oil storage chamber 10 before it flows back to other parts to be lubricated inside the compressor. The temperature of the lubricating oil is reduced, and more heat is taken away from the lubricated parts, which can greatly improve the lubricating effect of the lubricating oil. The oil storage chamber 10 is located between the rotor 3 and the drive motor 6. Due to the structural characteristics of this area, this area has a space with a certain axial height and radial dimensions. The existing technology does not utilize this space. A larger oil storage space can be obtained without increasing the height of the compressor cover. Compared with the oil storage technology set in the upper cover in the existing technology, the present invention can effectively reduce the axial dimension of the upper cover, and the compressor size is smaller, which is more conducive to the lightweight design of the system.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A compressor oil return structure, characterized by: include: A cover body (1), a shell (5), a stator (2), a bracket (4) and a crankshaft (7), wherein an oil storage chamber (10) is provided inside the bracket (4), a bearing a (19) is provided between the bracket (4) and the crankshaft (7), a first cavity (11) is enclosed between the bracket (4) and the crankshaft (7), the oil storage chamber (10) is located radially outside the first cavity (11), and the oil storage chamber (10) can be communicated with the first cavity (11); the oil discharged from the stator (2) can enter the oil storage chamber (10), and at least part of the oil in the oil storage chamber (10) can flow into the first cavity (11). In a cavity (11), the oil in the first cavity (11) can lubricate the bearing a (19); the housing (5) is also provided with a housing air intake (8), and the housing air intake (8) is located at an end away from the stator (2), close to the crankshaft (7) and away from the bracket (4); a second cavity (9) for air intake is provided in the housing (5), and the bracket (4) is located in the second cavity (9); the outer wall of the oil storage cavity (10) can generate heat exchange with the gas in the second cavity (9), and the second cavity (9) is located close to the housing air intake (8).

2. The compressor oil return structure according to claim 1, characterized in that: An oil separation chamber (15) is provided in the cover body (1), and the oil storage chamber (10) can be connected to the oil separation chamber (15) via an oil inlet channel (102); The oil inlet channel (102) comprises a first channel (402) and a second channel (201), wherein the first channel (402) is arranged on the bracket (4), and the second channel (201) is arranged on the stator (2), one end of the first channel (402) is connected to the oil storage chamber (10), and the other end is connected to the second channel (201), and the second channel (201) is connected to the oil distribution chamber (15).

3. The compressor oil return structure according to claim 2, characterized in that: The invention also includes a movable disc (3), a sealing gasket (18) being provided between the movable disc (3) and the bracket (4), a connecting channel b (181) being provided on the sealing gasket (18), one end of the connecting channel b (181) being connected to the second channel (201), and the other end being connected to the first channel (402), and a throttling structure being provided in any one or more of the connecting channel b (181), the second channel (201) and the first channel (402), so as to generate a pressure difference between the pressure in the oil storage chamber (10) and the pressure in the oil distribution chamber (15).

4. The compressor oil return structure according to claim 1, characterized in that: The bracket (4) is provided with an opening on one side facing the axis direction of the crankshaft (7), and the opening is communicated with the oil storage chamber (10); The compressor oil return structure further comprises a first cover plate (17), wherein the first cover plate (17) is arranged at the opening so that the oil storage cavity (10) can be sealed by the first cover plate.

5. The compressor oil return structure according to claim 4, characterized in that: An oil drain channel (101) is provided on the first cover plate (17), one end of the oil drain channel (101) is connected to the oil storage cavity (10), and the other end is connected to the second cavity (9); The oil drainage channel (101) comprises an oil drainage groove (173) and a third channel (174); the oil drainage groove (173) is provided on the end surface of the first cover plate (17); the third channel (174) is provided on the side wall of the first cover plate (17); the third channel (174) is connected to the oil drainage groove (173); after the second cavity (9) absorbs gas, the gas can drive the oil discharged from the oil drainage channel (101) to move.

6. The compressor oil return structure according to claim 4, characterized in that: A fourth channel (175) is provided on the end surface of the first cover plate (17); one end of the fourth channel (175) is connected to the first cavity (11), and the other end is connected to the oil storage cavity (10).

7. The compressor oil return structure according to claim 6, characterized in that: A throttling channel a (176) is provided on the end surface of the first cover plate (17), one end of the fourth channel (175) is connected to the throttling channel a (176), and the other end is connected to the oil storage chamber (10), and both ends of the throttling channel a (176) are connected to the first cavity (11).

8. The compressor oil return structure according to claim 4, characterized in that: A fifth channel (403) is provided on the bracket (4), one end of the fifth channel (403) being connected to the oil storage chamber (10) and the other end being connected to the first cavity (11).

9. The compressor oil return structure according to claim 8, characterized in that: A throttling element (21) is provided in the fifth channel (403), and the throttling element (21) can throttle and reduce the pressure of the oil in the fifth channel (403), so as to generate a pressure difference between the oil storage chamber (10) and the first cavity (11).

10. The compressor oil return structure according to claim 2, characterized in that: A second cover plate (22) is provided in the oil storage cavity (10), and the second cover plate (22) divides the space of the oil storage cavity (10) into an oil storage chamber and a first buffer cavity (103). A third through hole (221) is provided on the second cover plate (22), and one end of the third through hole (221) is connected to the oil storage chamber, and the other end is connected to the first buffer cavity (103). The first buffer cavity (103) can be connected to the oil separation cavity (15).

11. The compressor oil return structure according to claim 2, characterized in that: A second buffer cavity (24) is provided between the stator disc (2) and the cover body (1); one end of the second buffer cavity (24) is connectable to the oil separation cavity (15), and the other end is connectable to the oil storage cavity (10).

12. The compressor oil return structure according to claim 11, characterized in that: An exhaust chamber (14) is provided between the stator (2) and the cover body (1), the exhaust chamber (14) is communicated with the exhaust port of the stator (2), the exhaust chamber (14) is communicated with the oil separation chamber (15), and the second buffer chamber (24) is provided with a first inlet (151) and a second inlet (156), the first inlet (151) is communicated with the oil separation chamber (15), and the first inlet (151) can pass the liquid separated by the oil separation chamber (15) into the second buffer chamber (24), the second inlet (156) is communicated with the exhaust chamber (14), and the second inlet (156) can pass the liquid in the exhaust chamber (14) into the second buffer chamber (24).

13. The compressor oil return structure according to claim 11, characterized in that: The oil separation chamber (15) has an air outlet (16), and the air outlet (16) can discharge the gas discharged from the static disk (2) to the outside of the cover body (1). The oil separation chamber (15) also has a pressure stabilizing channel, one end of the pressure stabilizing channel is connected to the oil separation chamber (15), and the other end is connected to the second buffer chamber (24). The pressure stabilizing channel can transport the gas in the second buffer chamber (24) to the air outlet (16) to discharge the gas outside the cover body (1) from the air outlet (16).

14. The compressor oil return structure according to claim 13, characterized in that: The pressure stabilizing channel comprises a first through hole (202) and a second through hole (155); one end of the first through hole (202) is connected to the second buffer cavity (24), and the other end is connected to the second through hole (155); the second through hole (155) is connected to the air outlet (16).

15. The compressor oil return structure according to claim 1, characterized in that: It also includes a fixing member (401), the fixing member (401) being connected and arranged between the inner wall and the outer wall of the bracket (4), and the fixing member (401) is multiple, and the multiple fixing members (401) are arranged at intervals along the circumference of the bracket (4), so that the oil storage cavity (10) can be divided into a plurality of cavities by the fixing members (401).

16. A compressor, characterized in that: The invention comprises the compressor oil return structure according to any one of claims 1 to 15.

17. An air conditioner, characterized in that: Including the compressor according to claim 16.

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