Oil return structure of compressor, compressor and air conditioner

Abstract

The application provides a compressor oil return structure, a compressor and an air conditioner. The compressor oil return structure comprises a static disc, an exhaust cover one and an exhaust cover two. The exhaust cover one comprises a first body and a first protruding part. One end of the first body is capable of being connected with the static disc. The first protruding part is a structure arranged on the inner bottom wall of the first body and protruding towards the direction of the static disc. The exhaust cover two comprises a second body and a second protruding part. The second protruding part is a structure arranged on the second body and protruding away from the direction of the static disc. The second body is connected with the static disc and surrounds an exhaust area. The inside of the first protruding part is a hollow cavity, which is formed as an oil distribution cavity. The oil distribution cavity is capable of being communicated with the exhaust area. The outside of the first protruding part and the first body surround an oil storage cavity. The oil storage cavity is communicated with the oil distribution cavity. The application effectively designs the static disc and the cover body, so that the oil storage volume of the lubricating oil is increased without increasing the weight and size of the compressor.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, specifically to an oil return structure for a compressor, a compressor, and an air conditioner. Background Technology

[0002] Automotive aluminum alloy scroll compressors lack a stable internal oil sump for mechanical lubrication of the internal pump system. Instead, they rely on the refrigerant intake to carry the lubricating oil, followed by centrifugal separation of refrigerant and lubricating oil during exhaust, and then a throttling-based oil return design for the lubricating oil. Therefore, the efficiency of the exhaust centrifugal separation is crucial to the compressor's performance and reliability. Existing centrifugal separation structures are highly mature, and their high separation efficiency is sufficient to separate the vast majority of lubricating oil from the refrigerant. However, existing technical solutions for returning the separated lubricating oil to the compressor have significant problems, mainly in the following aspects: 1. The oil return and storage structure is poorly designed, and the structure is easily affected by the centrifugal separation structure, resulting in insufficient oil storage or the separated lubricating oil being carried away by the refrigerant; 2. The oil return structure directly uses a throttling structure to connect the high-pressure to the low-pressure or medium-pressure lubrication parts. Due to the large throttling pressure difference, insufficient throttling occurs under large pressure difference conditions, causing high-pressure gas to enter the low-pressure or medium-pressure parts, affecting compressor performance; under small pressure difference conditions, the return flow is too small, and the lubricating oil separated by the centrifugal separation structure cannot return to the compressor in time. Excess lubricating oil remains in the separation structure and is carried away by the refrigerant again, resulting in poor system heat exchange effect.

[0003] US Patent No. 6511530B2 discloses a structure for internal exhaust oil separation and oil storage in a compressor, such as... Figure 1a As shown, an exhaust chamber 136, an oil-gas separation chamber 11, and a lubricating oil storage chamber 15 are provided between the back of the compressor's stationary scroll plate 2 and the exhaust cover 4. The oil storage chamber 15 returns to the compressor's internal suction chamber through the oil return channel 2a, realizing the circulation of lubricating oil within the compressor. However, the following problems exist: In order not to affect the oil separation efficiency of the separation chamber 11, the oil storage chamber 15 must be located below the separation chamber in the direction of gravity, and the highest liquid level in the oil storage chamber must be lower than the oil outlet 14 of the separation chamber; otherwise, lubricating oil entering the separation chamber will affect the oil separation effect. Therefore, the same problem with this type of oil storage chamber technology patent number CN107575383A 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 oil storage chamber volume, the axial height of the oil storage chamber needs to be increased, which will lead to problems such as large compressor size, heavy weight, and high production costs. Meanwhile, the pressure inside this type of oil storage chamber is high pressure due to exhaust. Affected by the exhaust fluctuations of the pump body, the exhaust pressure fluctuates greatly, making it difficult to stabilize the liquid level inside the oil storage chamber, which also fluctuates greatly with the exhaust.

[0004] Patent CN107605726A discloses another oil return structure, such as... Figure 1b As shown, the oil return passage 7 inside the compressor discharge cover 4 connects the stationary plate 3 and the bracket 1. A throttling channel is set inside the bracket 1, so that the lubricating oil in the oil return passage 7 is introduced into the lubrication chamber 11 inside the bracket 1 to lubricate the bearings inside the lubrication chamber. Although the lubricating oil is directly introduced into the critical lubrication components inside the compressor, because the lubrication chamber 11 is a containment chamber with limited space, most of the lubricating oil in the oil return passage 7 cannot flow back into the compressor in time. This results in a large amount of lubricating oil entering the refrigeration system with the exhaust, affecting the system's heat exchange effect.

[0005] Because existing scroll compressors have problems such as unreasonable oil return and storage structure settings, and the oil storage structure is easily affected by the centrifugal separation structure, resulting in insufficient oil storage in the actual oil storage structure or the separated lubricating oil being carried away by the refrigerant, this invention studies and designs an oil return structure for a compressor, a compressor, and an air conditioner. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the existing scroll compressor having an unreasonable oil return and oil storage structure, resulting in a small amount of oil stored in the actual oil storage structure, thereby providing an oil return structure for a compressor, a compressor, and an air conditioner.

[0007] To address the above problems, the present invention provides an oil return structure for a compressor, comprising:

[0008] The system comprises a stationary disc, an exhaust cover one, and an exhaust cover two. The exhaust cover one includes a first body and a first protrusion. One end of the first body can be connected to the stationary disc. The first body has an internal cavity. The exhaust cover two is disposed in the internal cavity. The first protrusion is a structure disposed on the inner bottom wall of the first body and protruding towards the stationary disc. The exhaust cover two includes a second body and a second protrusion. The second protrusion is a structure disposed on the second body and protruding away from the stationary disc. The second body is connected to the stationary disc and forms an exhaust area between the second body, the second protrusion, and the stationary disc. The interior of the first protrusion is a hollow cavity forming an oil distribution chamber, which can communicate with the exhaust area. The exterior of the first protrusion and the first body form an oil storage chamber, which communicates with the oil distribution chamber.

[0009] In some embodiments, the first protrusion is connected to the second protrusion, and the first protrusion has an open end, forming the main exhaust channel of the exhaust cover.

[0010] The oil return structure also includes a separator, which is entirely disposed in the oil distribution chamber, or entirely disposed in the main exhaust channel, or partially disposed in the oil distribution chamber and partially disposed in the main exhaust channel. The separator has a flow channel inside, with one end of the flow channel flowing through the oil distribution chamber and the other end flowing through the main exhaust channel.

[0011] In some embodiments, the separator includes a separator mounting part and a separator part. An mounting groove is provided on the exhaust cover at the junction with the main exhaust channel. The separator mounting part is fixed to the mounting groove. The separator part is located in the oil distribution chamber. The separator part has a hollow tube structure, with one end connected to the separator mounting part and the other end being a free end.

[0012] In some embodiments, a limiting step is provided on the inner peripheral wall of the exhaust cover and its internal cavity to form a limiting part, and an installation end that can be matched and engaged with the limiting part is provided on the radial outer edge of the second body.

[0013] In some embodiments, the first protrusion is further provided with an exhaust channel one, and the second body is provided with an exhaust channel two. One end of the exhaust channel one is connected to the main exhaust channel and the other end is connected to the exhaust channel two. The exhaust channel two is an arc-shaped groove structure and is also connected to the oil storage chamber, so as to exhaust part of the gas in the oil storage chamber to the main exhaust channel through the exhaust channel two and the exhaust channel one.

[0014] In some embodiments, the first protrusion is further provided with an air intake channel one, one end of which is connected to the oil distribution chamber to allow air to enter the oil distribution chamber; the second protrusion is further provided with an air intake channel two, one end of which is connected to the exhaust area to allow air to enter from the exhaust area, and the other end of which is opposite to and connected to the air intake channel one, so as to guide the fluid in the exhaust area into the oil distribution chamber through the air intake channel two and the air intake channel one.

[0015] In some embodiments, a connecting component is provided in the first intake channel and the second intake channel. The connecting component has a through hole extending through both ends. Part of the connecting component is disposed in the first intake channel and part is disposed in the second intake channel. Gas in the exhaust area is introduced into the oil separator through the through hole.

[0016] In some embodiments, the first protrusion includes an exhaust cover second mounting portion and an exhaust cover second connecting portion. The exhaust cover second mounting portion is the plane of the first protrusion facing the exhaust cover second. One end of the exhaust cover second connecting portion is connected to the exhaust cover second mounting portion, and the other end extends to form a free end. A connecting hole is provided on the free end. The second protrusion is provided with an exhaust cover fastener and a through hole. The exhaust cover fastener can pass through the through hole and cooperate with the connecting hole to connect the exhaust cover first and the exhaust cover second into one unit. An air intake channel first is provided on the exhaust cover second mounting portion.

[0017] In some embodiments, the second body is further provided with an oil return channel one, which is located on the outer periphery of the second protrusion and on the radial outer side of the exhaust area. The oil return channel one penetrates the second body axially. The stationary plate is further provided with an oil return channel two, one end of which is connected to the oil storage chamber and the other end of which is connected to the oil return channel two. The oil return channel two can guide oil to the parts inside the compressor that need lubrication.

[0018] In some embodiments, the first protrusion is provided with an oil drain channel, one end of which is connected to the oil distribution chamber and the other end is connected to the oil storage chamber, so as to guide the oil from the oil distribution chamber to the oil storage chamber and then into the return oil channel.

[0019] In some embodiments, the oil drain channel is located at the bottom of the first protrusion and faces downwards. The upper end of the oil drain channel is connected to the oil distribution chamber, and the lower end is connected to the space below the first protrusion where the oil storage chamber is located.

[0020] In some embodiments, the oil drain channel is a notch formed on the side wall of the first protrusion, and the outflow direction of the notch is upward;

[0021] When the first protrusion includes an exhaust cover second mounting part and an exhaust cover second connecting part, the projection of the exhaust cover second mounting part on the axial end face is a rectangular structure.

[0022] The orientation of the notch in the oil drain channel forms an acute angle θ with the long side of the second mounting part of the exhaust cover. The long side of the second mounting part of the exhaust cover is vertical, and the opening of the oil drain channel is inclined upward; 0 < θ < 90°.

[0023] In some embodiments, the notch of the oil drain channel is formed on the second connecting part of the exhaust cover by cutting off part of the structure of the second connecting part of the exhaust cover, and at the same time, the second connecting part of the exhaust cover is cut to form an oil drain guide structure. The extension direction of the cut edge is the same as the orientation direction of the notch, that is, the extension direction of the cut edge and the long side direction of the second mounting part of the exhaust cover form the θ.

[0024] In some embodiments, a sealing component one is also included, wherein the exhaust cover is fitted onto the outer periphery of the exhaust cover two, the outer periphery of the exhaust cover two is provided with a first annular groove, and the sealing component one is disposed within the first annular groove and in contact with the inner periphery of the exhaust cover one; and / or,

[0025] A second groove is provided on the end face of the stationary disc facing the exhaust cover. The second groove is located on the outer periphery of the exhaust area and on the radial inner side of the oil return channel. The second groove is an annular groove. The oil return structure also includes a sealing component 2, which is engaged in the second groove.

[0026] A third groove is provided on the end face of the stationary disc facing the exhaust cover, and the third groove is located on the outer periphery of the oil return channel. The third groove is an annular groove, and the oil return structure also includes a sealing component three, which is engaged in the third groove.

[0027] In some embodiments, an oil channel is further provided on the inner wall of the axial end face of the second protrusion facing the stationary disc, and the oil channel is connected to the air intake channel; and / or, a porous filter structure is further provided in the oil storage cavity.

[0028] The present invention also provides a compressor comprising the oil return structure of the compressor described in the preceding claim.

[0029] The present invention also provides an air conditioner that includes the aforementioned compressor.

[0030] The oil return structure of the compressor, the compressor, and the air conditioner provided by this invention have the following beneficial effects:

[0031] 1. The oil return structure of the compressor of the present invention, by providing an exhaust cover second in the internal cavity of the end face of the exhaust cover one facing the stationary plate, and the exhaust cover second including a second body and a second protrusion, the second body, the second protrusion and the stationary plate enclose an exhaust area, the interior of the first protrusion forms an oil distribution chamber, the oil distribution chamber is connected to the exhaust area, enabling oil-gas separation inside the oil distribution chamber, and simultaneously the exterior of the first protrusion and the first body enclose an oil storage chamber, the oil storage chamber is connected to the oil distribution chamber, enabling the formation of an oil storage chamber structure for oil storage inside the exhaust cover one. Therefore, the present invention, through effective design of the stationary plate and the cover body, effectively... By utilizing this space, an oil reservoir is effectively created without increasing the axial and radial dimensions of the compressor. The reservoir has a large capacity, allowing it to store a significant amount of oil. The large volume of the reservoir eliminates the need for an additional increase in the size of the top cover and effectively prevents the separated lubricating oil from being carried away by the refrigerant. This increases the oil storage capacity within the compressor without increasing its weight or size. The invention utilizes an oil reservoir located within the top cover, resulting in a large volume. The projected area of ​​the oil reservoir along the compressor's axial direction can be very large, potentially approaching the entire surface of the compressor's stationary disc. Therefore, by increasing the cross-sectional area of ​​the oil reservoir, its axial height can be reduced.

[0032] 2. The sealing structure of the oil storage chamber of the present invention is located inside the compressor, preventing leakage to the outside of the compressor and maintaining a leakage level comparable to that of conventional structures. Furthermore, the pressure inside the oil storage chamber is the exhaust pressure, and it is connected to the oil separation chamber of the cyclone component, eliminating the need for throttling or flow control, thus maximizing the storage of oil separated by the cyclone gas. Attached Figure Description

[0033] Figure 1a This is an internal cross-sectional view of the scroll compressor in Background Art 1;

[0034] Figure 1b This is an internal cross-sectional view of the scroll compressor in Background Art 2;

[0035] Figure 2 This is an internal cross-sectional view of the scroll compressor of the present invention;

[0036] Figure 3 for Figure 2 A magnified view of part A (oil reservoir section);

[0037] Figure 4 This is a bottom view of the internal exhaust cover of the scroll compressor of the present invention. Figure 2 (Viewed from left to right)

[0038] Figure 5This is a bottom view of the exhaust cover (section view of the oil reservoir) inside the scroll compressor of the present invention.

[0039] Figure 6a This is a top view of the internal exhaust cover 2 of the scroll compressor of the present invention. Figure 2 (Viewed from right to left)

[0040] Figure 6b This is a side view of the internal exhaust cover 2 of the scroll compressor of the present invention;

[0041] Figure 6c This is a bottom view of the internal exhaust cover 2 of the scroll compressor of the present invention. Figure 2 (Viewed from left to right)

[0042] Figure 7 This is an exploded structural diagram of the exhaust cover 1 and exhaust cover 2 inside the scroll compressor of the present invention;

[0043] Figure 8 This is a cross-sectional view of the exhaust cover one and exhaust cover two of the present invention after assembly (alternative embodiment);

[0044] Figure 9 This is a bottom view of another embodiment of the exhaust cover of the present invention.

[0045] The reference numerals in the attached figures are as follows:

[0046] 1. Exhaust cover one; 1a. First body; 101. Exhaust passage one; 102. Oil drain passage; 103. Oil distribution chamber; 104. Intake passage one; 105. Mounting groove; 105a. Exhaust cover two mounting part; 106. Exhaust cover two connecting part; 107. First protrusion (exhaust cover separation part); 108. Opening part; 109. Limiting part; 2. Stationary plate; 201. Return oil passage two; 202. Return oil passage three; 203. Second groove; 204. Third groove; 12. Separator; 12a. Flow passage; 121. Separator mounting part; 122. 13. Exhaust cover II; 131. Oil return channel I; 132. First annular groove; 133. Exhaust channel II; 134. Air intake channel II; 135. Fastener mounting part; 136. Second body (static disc sealing part); 137. Second protrusion (exhaust cover I mounting part); 138. Oil intake channel; 139. Mounting end; 14. Sealing component I; 14b. Sealing component II; 15. Sealing component III; 16. Exhaust cover fastener; 17. Oil storage chamber; 18. Non-sealed chamber; 19. Exhaust area; 20. Main exhaust channel; 21. Connecting component;

[0047] 3. Moving plate; 4. Bracket; 5. Housing; 6. Drive motor; 7. Bearing 1; 8. Drive spindle; 9. Bearing 2; 10. Eccentric sleeve; 11. Bearing 3; θ, oil drain guide structure angle; D, oil drain channel diameter. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0049] like Figure 1a The diagram shows the structure of a conventional compressor, mainly comprising a compressor top cover, a stationary disc, a moving disc, and a compressor drive support structure. An exhaust chamber, an oil distribution chamber, and an oil storage chamber are formed between the compressor stationary disc and the top cover. The oil storage chamber is positioned below the oil distribution chamber, with the highest oil level in the storage chamber corresponding to the lowest oil outlet of the oil distribution chamber. The existing structure's placement of the exhaust chamber, oil distribution chamber, and oil storage chamber results in a large top cover, leading to a large and heavy compressor. The limited axial oil distribution length of the oil distribution chamber also reduces actual oil distribution efficiency. Furthermore, the oil storage chamber is directly connected to the exhaust chamber via the oil distribution chamber without a throttling and pressure-reducing structure. The pressure within the oil storage chamber fluctuates with the exhaust pressure. This large pressure fluctuation between the oil storage chamber and the oil distribution chamber makes it difficult for the lubricating oil separated in the oil distribution chamber to enter the oil storage chamber in a timely manner, resulting in it being carried away by the exhaust and affecting the oil storage and distribution efficiency.

[0050] like Figure 1b The existing technology shown includes a compressor with a housing, bracket, moving plate, stationary plate, top cover, and drive components. By providing oil return channels within the compressor's top cover, stationary plate, and bracket, the lubricating oil separated by the exhaust oil separator in the top cover is returned to the cavity within the bracket. Two bearings are located within the lubrication cavity. Because this bracket cavity is a moving part housing, the cavity space is limited, and the presence of an eccentric sleeve and moving plate affects the oil storage capacity of the cavity. This results in the separated lubricating oil not being completely stored within the compressor; excess lubricating oil is still carried away by the exhaust and enters the system, affecting system heat exchange.

[0051] This invention combines Figure 2-9 As shown, the curve illustrates:

[0052] Embodiments of the present invention provide an oil return structure for a compressor (preferably an oil return structure for a scroll compressor), comprising:

[0053] The system comprises a stationary disc 2, an exhaust cover 1, and an exhaust cover 13. The exhaust cover 1 includes a first body 1a and a first protrusion 107. One end of the first body 1a can be connected to the stationary disc. The first body 1a has an internal cavity. The exhaust cover 13 is disposed within the internal cavity. The first protrusion 107 is a structure disposed on the inner bottom wall of the first body 1a and protruding towards the stationary disc 2. The exhaust cover 13 includes a second body 136 and a second protrusion 137. The second protrusion 137 is disposed on the inner bottom wall of the first body 1a and protrudes towards the stationary disc 2. The second body 136 has a structure that protrudes in a direction away from the stationary disk 2. The second body 136 is connected to the stationary disk 2 and forms an exhaust area 19 between the second body 136, the second protrusion 137 and the stationary disk 2. The interior of the first protrusion 107 is a hollow cavity, forming an oil distribution cavity 103. The oil distribution cavity 103 can communicate with the exhaust area 19. The exterior of the first protrusion 107 and the first body 1a form an oil storage cavity 17. The oil storage cavity 17 communicates with the oil distribution cavity 103.

[0054] The oil return structure of the compressor of the present invention features an exhaust cover second disposed within an internal cavity on the end face of the exhaust cover one facing the stationary plate. The exhaust cover second includes a second body and a second protrusion. The second body, the second protrusion, and the stationary plate form an exhaust region. An oil distribution chamber is formed inside the first protrusion, which communicates with the exhaust region, enabling oil-gas separation within the oil distribution chamber. Simultaneously, an oil storage chamber is formed outside the first protrusion and the first body, communicating with the oil distribution chamber. This allows for the formation of an oil storage chamber structure inside the exhaust cover one. Therefore, the present invention effectively utilizes the efficient design of the stationary plate and the cover body to... By utilizing this space, an oil reservoir is effectively created without increasing the axial and radial dimensions of the compressor. The oil reservoir has a large capacity, allowing it to store a significant amount of oil. The large volume of the reservoir eliminates the need for an additional increase in the size of the top cover and effectively prevents the separated lubricating oil from being carried away by the refrigerant. This increases the oil storage capacity within the compressor without increasing its weight or size. The invention utilizes an oil reservoir located within the top cover, resulting in a large volume. The projected area of ​​the oil reservoir along the compressor's axial direction can be very large, potentially approaching the entire surface of the compressor's stationary disc. Therefore, by increasing the cross-sectional area of ​​the oil reservoir, its axial height can be reduced.

[0055] The present invention, “An Oil Return and Storage Structure for a Scroll Compressor,” is installed inside the compressor exhaust cover. It stores the lubricating oil after exhaust separation in the oil storage chamber. At the same time, the oil storage chamber is connected to the inside of the compressor through an oil return passage, so that the lubricating oil flows back to the medium-pressure and low-pressure sections of the compressor, thereby realizing the storage and return of lubricating oil.

[0056] Core Invention Point 1: A compressor oil storage structure, characterized in that: the oil storage structure has an oil storage cavity, an oil inlet passage, an exhaust passage, and an oil outlet passage. The oil storage structure is formed by an exhaust cover one that is connected and sealed to the housing and an exhaust cover two that is sealed to the exhaust cover. An oil distribution cavity is also provided in the oil storage cavity. The oil storage structure is located on the exhaust side of the stationary scroll plate. The aforementioned exhaust cover two is located inside the exhaust cover one, and the exhaust cover two and the back of the stationary scroll plate form a stationary scroll plate exhaust area, with one side of the exhaust cover plate being the exhaust area and the other side being the oil storage area. The oil distribution cavity is located on the exhaust cover one.

[0057] Combination Figure 3 The invention point 1 of the present invention is as follows: A compressor includes a housing 5, two exhaust covers and a stationary scroll plate 2. The exhaust cover 1 and the housing 5 form a compressor sealed cavity. The sealed cavity includes the stationary scroll plate 2 and the exhaust cover 2 13. The exhaust cover 2 is located between the stationary scroll plate and the exhaust cover 1, and forms an exhaust chamber and an oil storage chamber with the stationary scroll plate and the exhaust cover 1 respectively. The exhaust cover 1 has an oil distribution chamber 103.

[0058] This invention employs an oil storage chamber within the upper cover. The large volume of this chamber allows for a large projected area along the compressor's axial direction, potentially approaching the entire surface of the compressor's stationary disc. Therefore, increasing the cross-sectional area of ​​the oil storage chamber reduces its axial height. Furthermore, the sealing structure of the oil storage chamber is located inside the compressor, preventing leakage to the outside and maintaining a leakage level comparable to traditional structures. The pressure within the oil storage chamber is the exhaust pressure, and it is connected to the cyclone separator's oil distribution chamber, eliminating the need for throttling or flow control and maximizing the storage of oil separated by the cyclone.

[0059] The following technical problems were solved:

[0060] 1. Increase the oil storage capacity within the compressor without increasing the compressor's weight and size;

[0061] 2. The oil reservoir is sealed inside the compressor, which will not increase the amount of leakage from the compressor to the outside.

[0062] Figure 2The scroll compressor of this invention includes components such as an exhaust cover 1; a stationary disc 2; a moving disc 3; a bracket 4; a housing 5; a drive motor 6; a bearing 7; a drive shaft 8; a bearing 9; an eccentric sleeve 10; a bearing 11; an exhaust oil separator (separator 12); an exhaust cover 13; and a sealing component 14. The compressor drive and compression unit are located between the exhaust cover 1 and the housing 5. Furthermore, for the purpose of explaining the compressor structure of this invention, the illustrated internal space of the compressor is composed of the exhaust cover 1 and the housing 5. However, the oil return structure features of this invention can be used for compressors with one or more housings or top covers, regardless of the compressor's outer casing structure. The compression unit consists of the stationary disc 2 and the moving disc 3, and the drive unit consists of the motor 6, the crankshaft 8, and the bearing 7. The compression unit is driven by the drive unit to compress and discharge the refrigerant. Simultaneously, the compressor also includes a pump support unit, an oil-gas separation unit, and an oil storage chamber unit. The pump body support unit includes a bracket 4, an eccentric sleeve 10, etc.; the oil-gas separation unit includes exhaust covers one and two, a separator 12, etc.; and the oil storage chamber unit includes a sealed space enclosed by exhaust covers one and two. The circulation path of the lubricating oil with the refrigerant in the compressor is described as follows: The lubricating oil enters the low-pressure suction chamber inside the compressor housing through the suction port on the compressor. Driven by the drive unit, the pump body suction chamber of the compression unit continuously draws in the refrigerant and lubricating oil from the low-pressure suction chamber. After compression in the pump body compression chamber, a high-pressure, high-temperature mixture is formed. After compression, the mixture enters the exhaust chamber surrounded by the back of the stationary plate 2 and the inner periphery of the exhaust cover two. The mixture in the exhaust chamber enters the oil separator 103 through the exhaust channels on the exhaust covers (one and two) for oil-gas separation. The separated lubricating oil enters the oil storage chamber 17 in the exhaust cover (one and two) through the oil outlet channel at the bottom of the oil separator. The lubricating oil in the oil storage chamber 17 then enters the internal lubrication parts of the compressor through the corresponding oil discharge channels one, two, and three of the exhaust cover two and stationary plate, realizing the oil separation and return of lubricating oil inside the compressor.

[0063] In some embodiments, the first protrusion 107 is connected to the second protrusion 137, and the first protrusion 107 has an open end, forming the total exhaust channel 20 of the exhaust cover 1.

[0064] The oil return structure also includes a separator 12, which is entirely disposed in the oil distribution chamber 103, or entirely disposed in the main exhaust channel 20, or partially disposed in the oil distribution chamber 103 and partially disposed in the main exhaust channel 20. The separator 12 has a flow channel 12a inside, one end of which flows through the oil distribution chamber 103 and the other end of which flows through the main exhaust channel 20.

[0065] In some embodiments, the separator 12 includes a separator mounting part 121 and a separator part 122. An mounting groove 105 is provided on the exhaust cover 1 at the junction with the main exhaust channel 20. The separator mounting part 121 is fixed to the mounting groove 105. The separator part 122 is located in the oil distribution chamber 103. The separator part 122 has a hollow tube structure, with one end connected to the separator mounting part 121 and the other end being a free end.

[0066] In some embodiments, a limiting step is provided on the inner peripheral wall of the exhaust cover 1 and located in its internal cavity, forming a limiting part 109, and an installation end 139 that can be matched and engaged with the limiting part 109 is provided on the radial outer edge of the second body 136.

[0067] Invention Point 5: such as Figure 4 As shown, the outer periphery of the oil reservoir of the first exhaust cover is further provided with a limiting part 109, and a mounting end 139 is provided on the outer periphery of the second exhaust cover, so that the second exhaust cover can be axially limited on the limiting part 109 on the first exhaust cover. There is a gap between the second protrusion 137 and the connecting part 106 of the second exhaust cover.

[0068] In some embodiments, the first protrusion 107 is further provided with an exhaust channel 101, and the second body 136 is provided with an exhaust channel 133. One end of the exhaust channel 101 is connected to the main exhaust channel 20, and the other end is connected to the exhaust channel 133. The exhaust channel 133 is an arc-shaped groove structure, and it is also connected to the oil storage chamber 17, so as to exhaust part of the gas in the oil storage chamber 17 to the main exhaust channel 20 through the exhaust channel 133 and the exhaust channel 101.

[0069] Invention Point 6: As shown in Figure 6, an exhaust channel 2 133 is also provided on the end face of the exhaust cover 2 facing the oil storage chamber. The exhaust channel 2 can fully accommodate the exhaust channel 101 on the exhaust cover 1, thereby forming an oil storage chamber and a system exhaust chamber, introducing the gas in the oil storage chamber into the system pipeline. In addition, in the exhaust chamber (exhaust area 19) facing the stationary plate of the exhaust cover 2, several oil guide channels 138 are provided connecting to its exhaust channel 2 134, so that the lubricating oil accumulated in the exhaust chamber is introduced into the exhaust channel 2 under the airflow of the exhaust channel 2 and then separated. This can reduce the amount of lubricating oil accumulated in the exhaust chamber 19.

[0070] In some embodiments, the first protrusion 107 is further provided with an air intake channel 104, one end of which is connected to the oil distribution chamber 103 to allow air to enter the oil distribution chamber 103; the second protrusion 137 is further provided with an air intake channel 134, one end of which is connected to the exhaust region 19 to allow air to enter the exhaust region 19, and the other end of which is opposite to and connected to the air intake channel 104, so that the fluid in the exhaust region 19 can be introduced into the oil distribution chamber 103 through the air intake channel 134 and the air intake channel 104.

[0071] Key Invention Point 2: The aforementioned oil storage chamber has a space enclosed by an exhaust cover 1 and an exhaust cover 2. The exhaust cover 1 and exhaust cover 2 are separate structures. The exhaust cover 1 is provided with an air intake channel 1, an oil distribution chamber, an oil discharge channel, and a return air channel. The exhaust cover 2 is provided with a corresponding air intake channel 2 and an oil return channel. The oil discharge channel on the exhaust cover 1 constitutes the oil intake channel of the oil storage chamber, and the return air channel constitutes the exhaust channel of the oil storage chamber.

[0072] like Figure 3 The aforementioned oil storage chamber has a space enclosed by an exhaust cover 1 and an exhaust cover 2 13. Exhaust cover 1 and exhaust cover 2 are separate structures. Exhaust cover 1 is provided with an intake channel 104, an oil distribution chamber 103, an oil discharge channel 102, and an exhaust channel 101. Exhaust cover 2 is provided with a corresponding intake channel 2 134 and an oil discharge channel 3 131. Intake channel 2 134 is located in the exhaust area 19, and intake channel 104 is positioned along the axial projection direction of intake channel 2, with its opening connecting to the internal oil distribution chamber 103. The bottom of the oil distribution chamber has an axially oriented oil discharge channel 102, connecting the oil distribution chamber and the oil storage chamber. Return oil channel 131 is located at the bottom of the oil storage chamber, facilitating the return flow of lubricating oil.

[0073] Note: Continuous air intake channels can effectively guide the fluid entering the oil separator. If there is a gap or inconsistent outer diameter between air intake channels one and two, the flow rate or direction of the fluid after entering the channel will be affected, thus affecting the swirling flow in the oil separator and ultimately the separation efficiency.

[0074] In some embodiments, a connecting component 21 is provided in the first intake channel 104 and the second intake channel 134. The connecting component 21 has a through hole extending through both ends. Part of the connecting component 21 is disposed in the first intake channel 104, and part is disposed in the second intake channel 134. Gas in the exhaust region 19 is introduced into the oil separator 103 through the through hole. The intake channels are provided with… Figure 8The connecting component 21 shown can form continuous air intake channels one and two between the exhaust area and the oil separator, without being affected by the gap between the second protrusion 137 and the exhaust cover two connecting part 106, thereby improving the sealing performance and the oil-gas separation effect.

[0075] In some embodiments, the first protrusion 107 includes an exhaust cover second mounting portion 105a and an exhaust cover second connecting portion 106. The first protrusion 107 is also an exhaust cover first separation portion. The exhaust cover first separation portion is disposed on the inner bottom surface of the first body 1a and protrudes towards the stationary disc 2. The inner cavity of the exhaust cover first separation portion forms the oil distribution chamber 103. The exhaust cover second mounting portion 105a is the plane of the first protrusion 107 facing the exhaust cover second 13. One end of the exhaust cover second connecting portion 106 is connected to the exhaust cover second mounting portion 105a, and the other end extends to form a free end. A connecting hole is provided on the free end. The second protrusion 137 is provided with an exhaust cover fastener 16 and a through hole. The exhaust cover fastener 16 can pass through the through hole and cooperate with the connecting hole to connect the exhaust cover first 1 and the exhaust cover second 13 into one unit. An air intake channel first 104 is disposed on the exhaust cover second mounting portion 105a.

[0076] Key Invention Point 3: The air intake channels one and two on the exhaust cover one and exhaust cover two form a passage connecting the static plate exhaust area and the oil distribution chamber in the exhaust cover one, and the sealing of channels one and two is achieved through connecting components.

[0077] like Figure 4 As shown, the improved feature of the above-mentioned exhaust cover one is that: an opening 108 is provided on one side, the main body of the opening forming the main structure of the oil storage cavity 17, and an exhaust cover separation part (first protrusion 107) is also provided in the opening, with an oil distribution cavity in the middle of the exhaust cover separation part, and the separation member 12 is installed in the oil distribution cavity. The separation part 107 has an exhaust cover two mounting part 105a and an exhaust cover two connecting part 106, and the exhaust cover two 13 is installed on the exhaust cover two connecting part 106 and fastened by screws.

[0078] In some embodiments, the second body 136 is further provided with an oil return channel 131, which is located on the outer periphery of the second protrusion 137 and on the radial outer side of the exhaust area 19. The oil return channel 131 passes through the second body 136 axially. The stationary plate 2 is further provided with an oil return channel 201, one end of which is connected to the oil storage chamber 17 and the other end of which is connected to the oil return channel 201. The oil return channel 201 can guide oil to the parts inside the compressor that need to be lubricated.

[0079] Point 4 of the invention: As shown in Figure 6, the second exhaust cover is characterized by having a stationary plate sealing portion (second body 136) formed on the outer periphery towards the stationary plate side, and a mounting portion (second protrusion 137) for the first exhaust cover formed on the opposite side. The two mounting portions are set as planes, providing stable installation and good sealing performance, and the mounting portion of the first exhaust cover is substantially located within the stationary plate sealing portion. The first exhaust cover and the second exhaust cover form a seal on their outer periphery, which is achieved by a sealing member 14. The sealing member is located in the sealing member mounting portion (first annular groove 132) in the second exhaust cover. The oil discharge channel 3 (oil return channel 131) provided in the second exhaust cover passes through the second exhaust cover within the stationary plate sealing portion (second body 136) and connects to the aforementioned oil storage chamber 17.

[0080] In some embodiments, the first protrusion 107 is provided with an oil drain channel 102, one end of which is connected to the oil distribution chamber 103 and the other end is connected to the oil storage chamber 17, so that the oil in the oil distribution chamber 103 can be guided to the oil storage chamber 17 and then enter the return oil channel 131.

[0081] In some embodiments, the oil drain channel 102 is disposed at the bottom of the first protrusion 107 and the oil drain channel 102 is opened downward. The upper end of the oil drain channel 102 is connected to the oil distribution chamber 103 and the lower end is connected to the space of the oil storage chamber 17 located below the first protrusion 107.

[0082] In some embodiments, the oil drain channel 102 is a notch formed on the side wall of the first protrusion 107, and the outflow direction of the notch is upward;

[0083] When the first protrusion 107 includes an exhaust cover second mounting portion 105a and an exhaust cover second connecting portion 106, the projection of the exhaust cover second mounting portion 105a on the axial end face is a rectangular structure.

[0084] The orientation of the notch in the oil drain channel 102 forms an acute angle θ with the long side of the second vent cover mounting portion 105a. The long side of the second vent cover mounting portion 105a is vertical, and the opening of the oil drain channel 102 is inclined upward. 0 < θ < 90°.

[0085] like Figure 7 The following is an alternative embodiment of the present invention. The main difference from the above is that the oil drain channel 102 on the exhaust cover is different.

[0086] Invention Point 7: Figure 9As shown, the present invention is characterized in that the aforementioned oil drain channel is disposed at the bottom of the oil distribution chamber (first protrusion 107), and the opening direction of the oil drain channel 102 faces radially upward towards the oil storage chamber, forming an acute angle θ with the axial direction of the oil distribution chamber. It is disposed on the exhaust cap second connecting portion 106, which provides a generally upward (relative to the lower oil drain channel) guiding effect on the opening of the oil drain channel 102.

[0087] Explanation: The radially arranged exhaust channel opening and blocking part are designed to make it more difficult for gas in the exhaust channel to enter the return oil channel, so that the return oil channel is entirely filled with lubricating oil.

[0088] In some embodiments, the notch of the oil drain channel 102 is formed on the exhaust cover second connecting portion 106 by cutting off part of the structure of the exhaust cover second connecting portion 106, and at the same time, the exhaust cover second connecting portion 106 is cut to form an oil drain guide structure. The extension direction of the cut edge is the same as the orientation direction of the notch, that is, the extension direction of the cut edge and the long side direction of the exhaust cover second mounting portion 105a form the θ.

[0089] In some embodiments, a sealing component 14 is also included, wherein the exhaust cover 1 is sleeved on the outer periphery of the exhaust cover 2 13, the outer periphery of the exhaust cover 2 13 is provided with a first annular groove 132, and the sealing component 14 is disposed within the first annular groove 132 and in contact with the inner periphery of the exhaust cover 1; and / or,

[0090] A second groove 203 is provided on the end face of the stationary disc 2 facing the exhaust cover 13. The second groove 203 is located on the outer periphery of the exhaust area 19 and on the radial inner side of the oil return channel 201. The second groove 203 is an annular groove. The oil return structure also includes a sealing component 14b, which is engaged in the second groove.

[0091] A third groove 204 is provided on the end face of the stationary disc 2 facing the exhaust cover 13. The third groove 204 is located on the outer periphery of the oil return channel 201. The third groove 204 is an annular groove. The oil return structure also includes a sealing component 15, which is engaged in the third groove.

[0092] Core Invention Point 4: The above-mentioned exhaust cover 2 has at least two sealing features. Sealing part 1 seals with the back of the stationary plate to form an exhaust area, and sealing part 2 seals with the exhaust cover 1 to form an oil storage area.

[0093] Note: For example Figure 3As shown, exhaust cover 2 13 is formed within the cavity of exhaust cover 1. Sealing between exhaust cover 1 and exhaust cover 2 is achieved by sealing component 1 14, and sealing between exhaust cover 2 and stationary plate is achieved by sealing component 2 15. It should be noted that the oil reservoir formed between exhaust cover 1 and exhaust cover 2 is under exhaust pressure. The non-sealed cavity 18 formed between exhaust cover 2 and the back of stationary plate is generally set as a low-pressure area. Therefore, sealing component 1 14 is needed to seal both the oil reservoir and the non-sealed cavity 18 to prevent the high-pressure exhaust from the oil reservoir from entering the non-sealed cavity and ultimately the pump body cavity, affecting compressor performance. Therefore, on the back of stationary plate, the exhaust area 19 formed with exhaust cover 2 13 and the non-sealed cavity 18 are sealed by sealing component 3 15.

[0094] In some embodiments, an oil channel 138 is further provided on the inner wall of the axial end face of the second protrusion 137 facing the stationary disc 2, and the oil channel 138 communicates with the second air intake channel 134; and / or, a porous filter structure is further provided in the oil storage chamber 17. The present invention also enables the oil in the exhaust area to be guided as far as possible to the second air intake channel through the provision of the oil channel, so as to discharge it into the oil distribution chamber 103 to the greatest extent, thereby further improving the oil distribution efficiency.

[0095] Key Invention Point 5: The aforementioned exhaust oil storage chamber is equipped with a porous filter structure, which can separate the oil-gas mixture entering the oil storage chamber from the bottom of the exhaust oil separator, ensuring that the main component entering the oil discharge channel is lubricating oil, while the refrigerant gas enters the upper exhaust channel through the porous filter structure. The multi-layer filter structure can store the lubricating oil within the filter structure, preventing fluctuations in the oil level due to compressor position changes.

[0096] The present invention also provides a compressor (preferably a scroll compressor) that includes the oil return structure of the compressor described in any of the preceding claims.

[0097] The present invention also provides an air conditioner that includes the aforementioned compressor.

[0098] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0099] 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 should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An oil return structure for a compressor, characterized in that: include: The system comprises a stationary disc (2), an exhaust cover one (1), and an exhaust cover two (13). The exhaust cover one (1) includes a first body (1a) and a first protrusion (107). One end of the first body (1a) can be connected to the stationary disc. The first body (1a) has an internal cavity. The exhaust cover two (13) is disposed in the internal cavity. The first protrusion (107) is a structure disposed on the inner bottom wall of the first body (1a) and protruding towards the stationary disc (2). The exhaust cover two (13) includes a second body (136) and a second protrusion (137). The second protrusion (137) is a structure disposed on the inner bottom wall of the second body (1a) and protruding towards the stationary disc (2). The second body (136) has a structure that protrudes in a direction away from the stationary disk (2). The second body (136) is connected to the stationary disk (2) and forms an exhaust area (19) between the second body (136), the second protrusion (137) and the stationary disk (2). The interior of the first protrusion (107) is a hollow cavity, forming an oil distribution cavity (103). The oil distribution cavity (103) can communicate with the exhaust area (19). The exterior of the first protrusion (107) and the first body (1a) form an oil storage cavity (17). The oil storage cavity (17) communicates with the oil distribution cavity (103). Along the radial direction of the compressor, the oil storage chamber (17) is located on the outer periphery of the oil distribution chamber (103); the second body (136) is also provided with an oil return channel one (131), the oil return channel one (131) is located on the outer periphery of the second protrusion (137) and on the radial outer side of the exhaust area (19), the oil return channel one (131) passes through the second body (136) axially, the stationary plate (2) is also provided with an oil return channel two (201), one end of the oil return channel one (131) is connected to the oil storage chamber (17) and the other end is connected to the oil return channel two (201), the oil return channel two (201) can guide oil to the part to be lubricated inside the compressor; the oil storage chamber (17) located below the oil distribution chamber (103) is connected to the oil return channel one (131).

2. The oil return structure of the compressor according to claim 1, characterized in that: The first protrusion (107) is connected to the second protrusion (137), and the first protrusion (107) has an open end, forming the main exhaust channel (20) of the exhaust cover (1). The oil return structure also includes a separator (12), which is entirely disposed in the oil distribution chamber (103), or entirely disposed in the main exhaust channel (20), or partially disposed in the oil distribution chamber (103) and partially disposed in the main exhaust channel (20). The separator (12) has a flow channel (12a) inside, one end of which flows through the oil distribution chamber (103) and the other end of which flows through the main exhaust channel (20).

3. The oil return structure of the compressor according to claim 2, characterized in that: The separator (12) includes a separator mounting part (121) and a separator part (122). An mounting groove (105) is provided on the exhaust cover (1) and at the junction with the main exhaust channel (20). The separator mounting part (121) is fixed to the mounting groove (105). The separator part (122) is located in the oil separation chamber (103). The separator part (122) has a hollow tube structure, with one end connected to the separator mounting part (121) and the other end being a free end.

4. The oil return structure of the compressor according to claim 1, characterized in that: The exhaust cover (1) is provided with a limiting step on the inner peripheral wall of its internal cavity, forming a limiting part (109), and the second body (136) has an installation end (139) on its radial outer edge that can match and engage with the limiting part (109).

5. The oil return structure of the compressor according to claim 2, characterized in that: The first protrusion (107) is also provided with an exhaust channel one (101), and the second body (136) is provided with an exhaust channel two (133). One end of the exhaust channel one (101) is connected to the total exhaust channel (20), and the other end is connected to the exhaust channel two (133). The exhaust channel two (133) is an arc-shaped groove structure, and it is also connected to the oil storage chamber (17) so that part of the gas in the oil storage chamber (17) can be discharged to the total exhaust channel (20) through the exhaust channel two (133) and the exhaust channel one (101).

6. The oil return structure of the compressor according to claim 1, characterized in that: The first protrusion (107) is also provided with an air intake channel one (104), one end of which is connected to the oil distribution chamber (103) to allow air to enter the oil distribution chamber (103); the second protrusion (137) is also provided with an air intake channel two (134), one end of which is connected to the exhaust area (19) to allow air to enter from the exhaust area (19), and the other end of which is opposite to and connected to the air intake channel one (104) to guide the fluid in the exhaust area (19) into the oil distribution chamber (103) through the air intake channel two (134) and the air intake channel one (104).

7. The oil return structure of the compressor according to claim 6, characterized in that: A connecting component (21) is provided in the first intake channel (104) and the second intake channel (134). The connecting component (21) has a through hole through both ends. Part of the connecting component (21) is provided in the first intake channel (104) and part is provided in the second intake channel (134). Gas in the exhaust area (19) is introduced into the oil separator (103) through the through hole.

8. The oil return structure of the compressor according to claim 6, characterized in that: The first protrusion (107) includes an exhaust cover second mounting part (105a) and an exhaust cover second connecting part (106). The exhaust cover second mounting part (105a) is the plane of the first protrusion (107) facing the exhaust cover second (13). One end of the exhaust cover second connecting part (106) is connected to the exhaust cover second mounting part (105a), and the other end extends to form a free end. A connecting hole is provided on the free end. An exhaust cover fastener (16) and a through hole are provided on the second protrusion (137). The exhaust cover fastener (16) can pass through the through hole and cooperate with the connecting hole to connect the exhaust cover first (1) and the exhaust cover second (13) into one unit. An air intake channel first (104) is provided on the exhaust cover second mounting part (105a).

9. The oil return structure of the compressor according to claim 1, characterized in that: The first protrusion (107) is provided with an oil drain channel (102). One end of the oil drain channel (102) is connected to the oil distribution chamber (103) and the other end is connected to the oil storage chamber (17) so that the oil in the oil distribution chamber (103) can be guided to the oil storage chamber (17) and then enter the return oil channel (131).

10. The oil return structure of the compressor according to claim 9, characterized in that: The oil drain channel (102) is located at the bottom of the first protrusion (107) and the oil drain channel (102) is opened downward. The upper end of the oil drain channel (102) is connected to the oil distribution chamber (103) and the lower end is connected to the space of the oil storage chamber (17) located below the first protrusion (107).

11. The oil return structure of the compressor according to claim 9, characterized in that: The oil drain channel (102) is a notch opened on the side wall of the first protrusion (107), and the outflow direction of the notch is upward; When the first protrusion (107) includes an exhaust cover second mounting part (105a) and an exhaust cover second connecting part (106), the projection of the exhaust cover second mounting part (105a) on the axial end face is a rectangular structure. The notch of the oil drain channel (102) forms an acute angle θ with the long side of the second vent cover mounting part (105a). The long side of the second vent cover mounting part (105a) is vertical, and the opening of the oil drain channel (102) is inclined upward; 0 < θ < 90°.

12. The oil return structure of the compressor according to claim 11, characterized in that: The notch of the oil drain channel (102) is formed on the second connection part (106) of the exhaust cover. It is formed by cutting off part of the structure of the second connection part (106) of the exhaust cover. At the same time, the second connection part (106) of the exhaust cover is cut to form an oil drain guide structure. The extension direction of the cut edge is the same as the orientation direction of the notch. That is, the extension direction of the cut edge and the long side direction of the second mounting part (105a) of the exhaust cover form the θ.

13. The oil return structure of the compressor according to any one of claims 1-12, characterized in that: It also includes a sealing component one (14), wherein the exhaust cover one (1) is sleeved on the outer periphery of the exhaust cover two (13), the outer periphery of the exhaust cover two (13) is provided with a first annular groove (132), and the sealing component one (14) is disposed in the first annular groove (132) and is in contact with the inner periphery of the exhaust cover one (1); and / or, A second groove (203) is provided on the end face of the static plate (2) facing the exhaust cover (13). The second groove (203) is located on the outer periphery of the exhaust area (19) and on the radial inner side of the return oil channel (201). The second groove (203) is an annular groove. The return oil structure also includes a sealing component (14b), which is engaged in the second groove. A third groove (204) is provided on the end face of the static plate (2) facing the exhaust cover (13). The third groove (204) is located on the outer periphery of the oil return channel (201). The third groove (204) is an annular groove. The oil return structure also includes a sealing component (15), which is engaged in the third groove.

14. The oil return structure of the compressor according to claim 6, characterized in that: An oil channel (138) is also provided on the inner wall of the axial end face of the second protrusion (137) facing the stationary plate (2), and the oil channel (138) is connected to the second air intake channel (134); and / or, a porous filter structure is also provided in the oil storage cavity (17).

15. A compressor, characterized in that: The compressor includes the oil return structure of any one of claims 1-14.

16. An air conditioner, characterized in that: Includes the compressor as described in claim 15.

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