Oil separation structure and compressor

Abstract

The present disclosure provides an oil separation structure and a compressor. The oil separation structure comprises a first section and a second section; a communication hole is formed in the first section and the second section; the first section has a first end and a second end, and the first end is connected to the second section, so that the first section and the second section are communicated with each other; the inner diameter of the second section is the same as the inner diameter of the first end; airflow flows in through the second end and flows out from the end of the second section away from the first section; in a direction from the first end to the second end, the inner diameter of the first section is gradually increased, and the outer diameter of the first section is gradually increased. The present disclosure can overcome the defect in the related art of poor oil gas separation effects caused when oil separation parts are designed in cylindrical shapes and lubricating oils on the outer surfaces of the oil separation parts are prone to entering the oil separation parts.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present disclosure claims the priority right of a Chinese patent application entitled "Oil Separation Structure, and Compressor" and filed on November 10, 2023 with an application number of 202311495725.8, the disclosure of which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION Field of the Invention

[0002] The present relates the art of compressors, and particularly relates to oil separation structures and compressors.Description of Related Art

[0003] For vehicle-mounted aluminum alloy scroll compressors, there is no stable oil sump inside the compressor for allowing an oil pumping system inside the compressor to mechanically supply oil to lubricating parts. Instead, it relies on gas suction of the compressor for the refrigerant to carry the lubricating oil. Centrifugal separation is then performed on the exhaust gas to separate the lubricating oil from the refrigerant, followed by a throttling and oil return design for the lubricating oil. Therefore, the oil return efficiency of the centrifugal separation for the exhaust gas is crucial to the performance and reliability of the compressor. The existing centrifugal separation structure is very mature. The centrifugal separation structure itself features high separation efficiency, and can definitely meet the requirement of separating most of the lubricating oil from the refrigerant. However, there are significant problems in the relevant technical solutions for flow of the separated lubricating oil back into the compressor, mainly focusing on the following two aspects: 1. the arrangement of the oil return and storage structure is improper, and the oil storage structure is susceptible to the influence of the centrifugal separation structure, resulting in insufficient oil storage in the actual oil storage structure or the separated lubricating oil being carried away again by the refrigerant; 2. the oil return structure directly adopts a throttling structure to communicate high pressure with the low-pressure or medium-pressure lubricating part; due to the large throttling pressure difference, during actual operation, when the pressure difference is large, insufficient throttling will occur, causing the high-pressure gas to enter the low-pressure or medium-pressure part and thus affecting performance of the compressor; when the pressure difference is small, the oil return flow rate is too low, so the lubricating oil separated by the centrifugal separation structure cannot flow back to the compressor in time, and the excess lubricating oil remains in the separation structure and is then taken away by the refrigerant again, resulting in poor heat exchange effect of the system..

[0004] The related art proposes an internal structure of the compressor for separating oil from the exhaust gas and for oil storage. As shown in Figure 1, an exhaust cavity, an oil separator and a lubricating oil storage chamber are arranged between the back surface of a static disc of the compressor and an exhaust cover. The lubricating oil in the oil storage chamber returns to the suction chamber inside the compressor through an oil return channel, thus achieving circulation of the lubricating oil inside the compressor. However, as this kind of oil separator adopts a cylindrical design, with the inlet of the oil separator located at the bottom, the velocity of flow of the oil-gas mixture from bottom to top in the cavity where the oil separator is located is higher than the flow velocity from top to bottom at the outer side of the bottom inside the cavity. This creates a pressure difference between the inside and the outside, with lower internal pressure and higher external pressure. Consequently, the oil accumulated on the outer wall surface of the oil separator enters the interior of the oil separator through the inlet at the bottom of the oil separator, resulting in poor separation efficiency.

[0005] Due to the cylindrical design of the oil separator in the related art, the lubricating oil on the outer surface of the oil separator tends to enter the interior of the oil separator, resulting in technical problems such as poor oil-gas separation effect, so the present disclosure makes a research and designs an oil separation structure and a compressor.SUMMARY OF THE INVENTION

[0006] Therefore, the technical problem to be solved by the present disclosure is to overcome the defect in the related art that the lubricating oil on the outer surface of the oil separator tends to enter the interior of the oil separator to result in poor oil-gas separation effect, and thus provide an oil separation structure and a compressor.

[0007] In order to solve the above problem, the present disclosure provides an oil separation structure, which includes a first segment and a second segment both provided with communication holes, wherein the first segment has a first end and a second end, the first end is connected to the second segment so that the first segment is in communication with the second segment; the second segment has an inner diameter equal to that of the first end; gas flow flows in through the second end and flows out through an end of the second segment away from the first segment; and along a direction from the first end to the second end, an inner diameter of the first segment gradually increases, and an outer diameter of the first segment gradually increases.

[0008] In some embodiments, the oil separation structure further includes a third segment and a fourth segment both provided with gas flow channels, wherein the third segment has one end communicate with the fourth segment, and has the other end communicate with the second segment; along an axial direction of the communication hole, the end of the third segment facing the second segment is provided with a first groove, and an end of the second segment facing the third segment is provided with a first mounting portion, which is inserted into and engaged with the first groove; and the first mounting portion is movable within the first groove along the axial direction of the hole.

[0009] In some embodiments, an inner wall of the first groove facing the communication hole is a second mounting portion, and along a radial direction of the communication hole, the sum of a thickness of the second mounting portion and a width of the first groove is the same as a thickness of the second segment.

[0010] In some embodiments, an inner wall of the second segment is provided with a mating portion, the mating portion being located on the second segment at a position close to the third segment relative to the first end; and inside the second segment is provided a first elastic element, part of which is connected to the mating portion and the remaining part of which is connected to the second mounting portion.

[0011] In some embodiments, an inner wall of the groove is provided with a second magnetic member, the first mounting portion is provided with a first magnetic member, the second magnetic member opposes the first magnetic member, and along the axial direction of the communication hole, the second magnetic member and the first magnetic member are arranged with like poles facing each other.

[0012] In some embodiments, the second magnetic member and the first magnetic member are both annular; or, the second magnetic member and the first magnetic member are both strip-shaped; or, the second magnetic member is annular, while the first magnetic member is strip-shaped; or, the second magnetic member is strip-shaped, while the first magnetic member is annular.

[0013] In some embodiments, a ratio of the inner diameter of the second segment to an inner diameter of the second end is 0.65 to 0.85, and taking a longitudinal section of the first segment as a projection plane, an included angle between an inner wall of the first segment and a central axis of the first segment is 4 to 10 °.

[0014] The present disclosure also provides a compressor including the oil separation structure as stated above.

[0015] In some embodiments, the compressor includes a housing equipped with a static disc and a movable disc, wherein the static disc and the movable disc cooperate to form a compression assembly; a bracket is arranged on a side of the movable disc away from the static disc; on the housing is disposed a cover body, which opposes the static disc; an exhaust cavity is formed between the cover body and the static disc; the cover body has a hollow cavity therein, and is provided with an outlet thereon; the exhaust cavity communicates with the hollow cavity through the outlet, and the oil separation structure is located in the hollow cavity.

[0016] In some embodiments, when the oil separation structure further includes a third segment and a fourth segment, the fourth segment is connected with the cover body; the oil separation structure divides the hollow cavity into a first cavity and a second cavity; the cover body is provided with an exhaust port which communicates with the second cavity, and is provided with an outlet which opposes the second segment; and the first segment, the second segment and the third segment are located within the first cavity, with a gap between outer wall surfaces of the first segment, the second segment and the third segment and an inner wall surface of the first cavity.

[0017] In some embodiments, the cover body is provided with an oil return channel, which communicates with the first cavity, is configured to convey oil in the first cavity into the compression assembly.

[0018] In some embodiments, the first cavity has a first portion, a second portion and a third portion, wherein the second portion is located between the first portion and the third portion; the first portion opposes the second segment and the third segment; the first segment is located in the second portion; further, along the axial direction of the communication hole, a length of the second portion is greater than that of the first segment; and a plug is arranged in the third portion.

[0019] In some embodiments, along a direction from the second cavity towards the first cavity, a cross-sectional area of the second portion gradually increases, and an end of the plug facing the first segment is conical, or the end of the plug facing the first segment is provided with a second groove; and with the axial direction of the communication hole taken as a longitudinal direction of the plug and a longitudinal section of the plug taken as a projection plane, a projection plane of the second groove is in a conical shape; and an opening of the oil return channel is loc ated between the plug and the second portion.

[0020] In some embodiments, along the axial direction of the communication hole, the third portion has a bottom surface, and a second elastic element is disposed between the plug and the bottom surface, allowing the plug to be movable within the third portion; a first oil return hole is disposed on the plug; and an opening of the oil return channel is located between the bottom surface and the plug.

[0021] In some embodiments, along the axial direction of the communication hole, an inner side wall of the third portion is provided with a fourth groove in annular shape, in which the plug is at least partially located;

[0022] along the axial direction of the communication hole, an outer wall of the plug is provided with a plurality of fifth grooves, which run through both ends of the plug; the fifth grooves and the inner wall of the third portion enclose to define second oil return holes, a plurality of which are evenly distributed along a circumferential direction of the plug; the first oil return hole is located in the middle of the plug, or there are a plurality of the first oil return holes provided, which are evenly distributed on the plug, so that the second portion communicates with the third portion.

[0023] In some embodiments, a third cavity is formed between the plug and the bottom surface, the oil return channel communicates with the third cavity, and the bottom surface is provided with a third groove; and with the axial direction of the communication hole taken as a longitudinal direction of the plug, and a longitudinal section of the plug taken as a projection plane, a projection plane of the third groove is conical.

[0024] The oil separation structure and compressor provided in the present disclosure have the following beneficial effects:

[0025] By having the inner diameter of the first segment gradually increase along the direction from the first end towards the second end, the first segment is flared. With the axial section of the first end taken as a projection plane, the first segment is in conical shape. After being discharged from a static disc, the oil-gas mixture first rotationally moves along the outer wall surface of the oil separation structure; when moving to below the first segment, the oil-gas mixture flows back upwards, enters the first segment through the second end, and then rotationally moves upward along the inner walls of the first segment and the second segment; under the action of centrifugal force, the oil is separated onto the inner wall or the outer wall of the oil separation structure; the oil moves downwards under the action of its own gravity, while the gas moves upward until it is discharged from the end of the second segment away from the first segment. The flared arrangement of the first segment reduces the flow velocity of the gas entering the oil separation structure, thereby preventing the oil on the outer wall surface of the oil separation structure from entering the interior of the oil separation structure through the inlet. Further, the flow velocity of the gas flowing from the first segment to the second segment is increased due to gradual reduction of the inner diameter, thereby improving the oil-gas separation rate in the second segment, and improving the oil-gas separation effect of the oil separation structure.BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present disclosure or technical solutions in the related art, drawings required for describing the embodiments or the related art will be briefly provided below. It is obvious that the drawings described below are merely exemplary and those skilled in the art can derive other implementation drawings based on the drawings provided without paying inventive effort.

[0027] The structures, proportions, sizes and the like shown in the specification are only used to cooperate with the contents disclosed in the specification for understanding and reading of those skilled in the art, and are not intended to limit the conditions under which the present disclosure can be implemented. Therefore, they have no substantial technical significance. Any modification in structure, change in proportional relationship, or adjustment of the size, shall still fall within the scope covered by the technical contents disclosed in the present disclosure, as long as it does not affect the efficacy and the achievable purpose of the present disclosure. Figure 1 is a schematic view of a partial structure of a compressor in the prior art. Figure 2 is an assembly view of an oil separation structure according to an embodiment of the present disclosure. Figure 3 is a schematic view of an oil separation structure according to an embodiment of the disclosure. Figure 4 is a schematic view showing a connection structure between a second segment and a third segment of an oil separation structure according to an embodiment of the present disclosure. Figure 5 is a schematic view showing the moving states of the second segment and the third segment of the oil separation structure according to an embodiment of the present disclosure. Figure 6 is a schematic view showing the connection structure between the second segment and the third segment of the oil separation structure according to another embodiment of the present disclosure. Figure 7 is a schematic view showing the moving states of the second segment and the third segment of the oil separation structure according to another embodiment of the present disclosure. Figure 8 is a top view of the oil separation structure according to another embodiment of the present disclosure. Figure 9 is a top view of the oil separation structure according to a third embodiment of the present disclosure. Figure 10 is a schematic layout view of a first magnetic member and a second magnetic member of the oil separation structure according to an embodiment of the present disclosure. Figure 11 is a partial schematic view of a compressor according to embodiments of the present disclosure. Figure 12 is a partial schematic view of the compressor according to a first embodiment of the present disclosure. Figure 13 is a partial schematic view of the compressor according to a second embodiment of the present disclosure. Figure 14 is a schematic view of a plug of the compressor according to an embodiment of the present disclosure. Figure 15 is a schematic view of the plug of the compressor according to another embodiment of the present disclosure. Figure 16 is a partial schematic view of the compressor according to a third embodiment of the present disclosure.

[0028] Reference signs: 1. cover body; 2. static disc; 3. movable disc; 4. housing; 5. bracket; 6. compression cavity; 7. exhaust cavity; 8. oil return channel; 9. first cavity; 10. oil separation structure; 11. outlet; 12. second cavity; 13. first segment; 14. second segment; 15. third segment; 16. fourth segment; 17. exhaust channel; 18. second oil return hole; 19. mating portion; 20. first mounting portion; 21. first elastic element; 22. second mounting portion; 23. first magnetic member; 24. second magnetic member; 25. limiting portion; 26. inner wall surface; 27. plug; 28. inlet; 29. third cavity; 30. first oil return hole; 31. second elastic element.DESCRIPTION OF THE INVENTION

[0029] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are merely some rather than all of the embodiments of the present disclosure. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended as a limitation of the present disclosure and its application or uses. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without inventive effort shall fall within the protection scope of the present disclosure.

[0030] It should be noted that the terms used herein is merely for describing specific implementations rather than intended to limit the exemplary implementations according to the present disclosure. As used herein, unless otherwise clearly stated, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the stated features, steps, operations, devices, assemblies and / or combinations thereof.

[0031] It should be understood that the term "and / or" used herein merely describes an association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may indicate three cases: A exists alone, both A and B exist, and B exists alone. In addition, the symbol " / " used herein generally indicates that the associated objects preceding and following it have an "or" relationship.

[0032] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure. Meanwhile, it should be understood that the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships for ease of description. The technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices shall be deemed part of the granted specification. In all examples shown and discussed herein, any specific values shall be construed as merely illustrative rather than restrictive. Accordingly, other examples of the exemplary embodiments may have different values. It should be noted that like reference signs and letters denote like items in the following drawings; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0033] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom", etc. are generally based on the accompanying drawings. This is merely for the convenience of describing the present disclosure and simplifying the description. Unless specified otherwise, these orientation terms do not indicate or imply that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation, and thus shall not be construed as limiting the protection scope of the present disclosure. The orientation terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0034] For ease of description, spatially relative terms such as "on...", "above...", "on the upper surface of...", and "upper" may be used herein to describe the spatial positional relationship between one device or feature and other devices or features as shown in the drawings. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if a device in the drawings is inverted, the device described as "above" or "on" other devices or structures would then be positioned "below" or "underneath" the other devices or structures. Thus, the exemplary term "above..." may encompass both orientations of "above..." and "below...". The device may also be positioned in other different ways (rotated by 90 degrees or at other orientations), and corresponding interpretations shall be made to the spatially relative descriptions used herein.

[0035] In addition, it should be noted that the use of terms such as "first", "second", etc. to define components is merely for the convenience of distinguishing the corresponding components. Unless otherwise stated, the aforesaid terms have no special meanings and thus shall not be construed as limiting the protection scope of the present disclosure.

[0036] With reference to Figures 1 to 16, according to an embodiment of the present disclosure, there is provided an oil separation structure, which includes a first segment 13 and a second segment 14 both provided with communication holes. The first segment 13 has a first end and a second end, wherein the first end is connected to the second segment 14 so that the first segment 13 is in communication with the second segment 14. The second segment 14 has an inner diameter the same as that of the first end. Gas flow flows in through the second end and flows out through an end of the second segment 14 away from the first segment 13. Along a direction from the first end to the second end, the inner diameter of the first segment 13 gradually increases, and the outer diameter of the first segment 13 also gradually increases. In this technical solution, by making the inner diameter of the first segment 13 gradually increase along a direction from the first end to the second end, the first segment 13 is flared. Taking the axial section of the first end as a projection plane, the first segment 13 is conical in shape. After being discharged from a static disc, an oil-gas mixture firstly rotationally moves along the outer wall surface of an oil separation structure; when moving to below the first segment 13, the oil-gas mixture flows back upwards, enters the first segment 13 through the second end, and then rotationally moves upward along the inner walls of the first segment 13 and the second segment 14; under the action of centrifugal force, the oil is separated onto the inner wall or the outer wall of the oil separation structure; the oil moves downwards under the action of its own gravity, while the gas moves upward until it is discharged from the end of the second segment 14 away from the first segment 13. The flared arrangement of the first segment 13 reduces the flow velocity of the gas entering the oil separation structure, thereby preventing the oil on the outer wall surface of the oil separation structure from entering the interior of the oil separation structure through the inlet. In addition, the flow velocity of the gas flowing from the first segment 13 to the second segment 14 is gradually increased due to gradual reduction of the inner diameter, thereby improving the oil-gas separation rate in the second segment 14, and improving the oil-gas separation effect of the oil separation structure; the gradually increasing outer diameter of the first segment 13 narrows the flow area of the oil-gas mixture as it flows out from the outlet to the first cavity 9 along the outer wall of the oil separation structure, thereby increasing its flow velocity, and preventing the oil on the outer wall surface of the oil separation structure from entering the interior of the oil separation structure through the oil outlet.

[0037] The compressor structure in the related art mainly includes a compressor upper cover, a static disc, a movable disc, and a compressor drive support structure. An exhaust cavity, an oil separation chamber and an oil storage chamber are formed between the static disc and the upper cover of the compressor. The oil storage chamber is arranged below the oil separation chamber, i.e., in the direction of gravity. The highest oil level in the oil storage chamber corresponds to the bottommost oil outlet of the oil separation chamber, and the highest liquid level in the oil storage chamber needs to be lower than the oil outlet of the oil separation chamber; otherwise, the lubricating oil may enter the separation chamber and affect the oil separation effect. However, when the compressor undergoes positional change with the vehicle travelling uphill or downhill or with the road surface jolting, the oil level in such an oil storage chamber becomes unstable, making it difficult to achieve normal oil return to the oil sump and prone to air channeling. In addition, the structural position arrangement of the exhaust cavity, the oil separation chamber and the oil storage chamber requires the upper cover to be designed with a large volume, resulting in an increase in the size and weight of the compressor. The limited axial oil separation length of the oil separation chamber also leads to a reduction in the actual oil separation efficiency.

[0038] Referring to FIG. 1, in the related art, a compressor includes a housing, a bracket, a movable disc, a static disc, an upper cover, and a driving member. By arranging oil return channels in the upper cover, the static disc and the bracket of the compressor, the lubricating oil separated by the exhaust and oil-separation structure in the upper cover is returned to the cavity inside the bracket. As the oil separation channel formed between the oil separation structure and the upper cover is in a fixed form, it only has excellent oil-gas separating efficiency at a rated design of flow rate, and the separation efficiency is unsatisfactory at other flow rates, resulting in poor adaptability to full operating conditions.

[0039] In some embodiments, the oil separation structure further includes a third segment 15 and a fourth segment 16 both provided with gas flow channels. One end of the third segment 15 communicates with the fourth segment 16, and the other end of the third segment 15 communicates with the second segment 14. The second segment 14 has a constant inner diameter. Along a direction from the second segment 14 to the fourth segment 16, the inner diameters of the third segment 15 and the fourth segment 16 gradually increase. The inner diameter of said the other end of the third segment 15 is the same as that of the second segment 14. In this technical solution, with reference to Figures2 and 3, the inner diameter of said one end of the third segment 15 is consistent with the inner diameter of an end of the fourth segment 16 in connection with the third segment 15. The inner walls of the third segment 15 and the fourth segment 16 are connected with a smooth transition, and the outer walls of the second segment 14, the third segment 15 and the fourth segment 16 are also connected with a smooth transition. In some embodiments, the second segment 14, the third segment 15 and the fourth segment 16 may be integrally formed. The gas flow channels are in communication with the communication holes to form an exhaust channel 17. Gas flow flows in through the second end and is discharged from the fourth segment 16. During installation, the oil separation structure is disposed inside the cover body 1, and a first cavity 9 is formed between the oil separation structure and the cover body 1. After being discharged from the static disc, the gas flow swirls downward along the inner wall of the first cavity 9, turns back at the bottom of the first cavity 9, and then enters the second end. When the oil and the refrigerant flows through the gap between the outer wall of the oil separation structure and the inner wall of the first cavity 9, part of the lubricating oil will adhere to the outer wall of the oil separation structure 10. In the related art, the velocity of the gas flow moving upward from the bottom is higher than that moving downward from the top, which creates a pressure difference between the inside and the outside of the oil separation structure, resulting in a lower pressure inside the structure and a higher pressure outside the structure. Consequently, the oil accumulated on the outer wall surface of the oil separation structure 10 may enter the oil separation structure through the second end. However, in the present disclosure, a flared first segment 13 is adopted, which reduces the velocity of the gas flow at the second end, thereby reducing the internal-external pressure difference and preventing the oil accumulated on the outer wall surface of the oil separation structure 10 from entering the interior of the oil separation structure through the second end.

[0040] In some embodiments, along the axial direction of the communication hole, the end of the third segment 15 facing the second segment 14 is provided with a first groove, the end of the second segment 14 facing the third segment 15 is provided with a first mounting portion 20, and the first mounting portion 20 is inserted into and engaged with the first groove. The first mounting portion 20 is movable inside the first groove along the axial direction of the communication hole. In this technical solution, the first groove is an annular groove, and the first mounting portion 20 is movable inside the first groove, thereby capable of increasing the length of the exhaust channel 17, extending the flow path of the oil-gas mixture in the oil separation structure, and accordingly improving the oil-gas separation effect.

[0041] In some embodiments, the inner wall of the first groove facing the communication hole is a second mounting portion 22, and along the radial direction of the communication hole, the sum of the thickness of the second mounting portion 22 and the width of the first groove is the same as the thickness of the second segment 14. In this technical solution, along the radial direction of the communication hole, the outer wall of the first mounting portion 20 is smoothly transitionally connected with the outer wall of the second segment 14, and a stepped structure is formed between the inner wall of the second segment 14 and the inner wall of the first mounting portion 20; along the radial direction of the communication hole, the sum of the thickness of the second mounting portion 22 and the width of the first groove is the same as the thickness of the second segment 14, such that a limiting structure is formed between the second segment 14 and an open end of the first groove. An end surface of the second mounting portion 22 facing the first end constitutes a limiting portion 25, and the limiting portion 25 forms a limiting fit with the second segment 14, thus ensuring that the first mounting portion 20 is completely inserted into the first groove.

[0042] In some embodiments, the inner wall of the second segment 14 is provided with a mating portion 19, which is located on the second segment 14 at a position closer to the third segment 15 relative to the first end. Inside the second segment 14 is disposed a first elastic element 21; a part of the first elastic element 21 is connected to the mating portion 19 and the rest part is connected to the second mounting portion 22. In this technical solution, the first elastic element 21 is a spring, and the first elastic element 21 is located in the communication hole of the second segment 14, as shown in Figures 4 and 5. In the actual operation process of the compressor, the compressor may operate at different flow rates due to the change in the ambient temperature. The separation principle of the oil separation structure is that: by means of the rotational centrifugal movement of the oil-gas mixture in the oil separation channel, the lubricating oil with high density is 'thrown' to the hole wall of the exhaust channel under the action of centrifugal force to achieve oil-gas separation. Therefore, the flow velocities of the fluid entering the gas inlet channel are different due to different flow rates. At low flow rates, the flow velocity of the oil-gas mixture is low, accordingly requiring the separation speed to be high, while at high flow rates, the flow velocity of the oil-gas mixture is high, thus allowing a reduced separation speed. Therefore, in order to improve the separation efficiency at low flow rates, the axial length of the oil separator is reduced to increase the flow velocity of the oil-gas mixture in the exhaust channel 17. Therefore, a long axial length may be set at high flow rates, and the axial length can be axially reduced under the elastic action of the first elastic element 21 at low flow rates. Referring to FIG. 5, the oil separator has a first segment 13, so an axial impact is generated during flow of the fluid, wherein the impact force is large at high flow rates and small at low flow rates, and when the impact force is less than the resilience force of the first elastic element 21, the second segment 14 is pulled back by the first elastic element 21, and the axial length of the exhaust channel 17 is reduced.

[0043] In some embodiments, the inner wall of the groove is provided with a second magnetic member 24, and the first mounting portion 20 is provided with a first magnetic member 23. The second magnetic member 24 is opposite to the first magnetic member 23, and along the axial direction of the communication hole, the second magnetic member 24 and the first magnetic member 23 are arranged with like poles facing each other. In this technical solution, referring to Figures 6 and 7, in the actual operation process of the compressor, the compressor may operate at different flow rates due to the change in the ambient temperature. The separation principle of the oil separation structure is that: by means of the rotational centrifugal movement of the oil-gas mixture in the oil separation channel, the lubricating oil with high density is "thrown'" to the hole wall of the exhaust channel under the action of centrifugal force to achieve oil-gas separation. Therefore, the flow velocities of the fluid entering the gas inlet channel are different due to different flow rates. At low flow rates, the flow velocity of the oil-gas mixture is low, accordingly requiring the separation speed to be high, while at high flow rates, the flow velocity of the oil-gas mixture is high, thus allowing a reduced separation speed. Therefore, in order to improve the separation efficiency at low flow rates, the axial length of the oil separator is reduced to increase the flow velocity of the oil-gas mixture in the exhaust channel 17. Therefore, through the second magnetic member 24 and the first magnetic member 23, the third segment 15 and the second segment 14 are in the position shown in FIG. 6 under natural conditions due to the magnetic attraction. When the flow velocity of the fluid is high, the force acting on the first segment 13 increases, and when the force exceeds the magnetic attraction force, the third segment 15 moves relative to the second segment 14. According to the maximum oil flow rate and the magnetic attraction force, the parameters of the two can be designed accordingly, so that the offset dimension between the first and second magnetic members can still maintain the magnetic attraction at the maximum flow rate, and the offset dimension can be reduced back when the flow rate decreases.

[0044] In some embodiments, the second magnetic member 24 and the first magnetic member 23 are both annular; or, the second magnetic member 24 and the first magnetic member 23 are both strip-shaped; or, the second magnetic member 24 is annular, while the first magnetic member 23 is strip-shaped; or, the second magnetic member 24 is strip-shaped, while the first magnetic member 23 is annular. In this technical solution, as shown in Figures 8, 9 and 10, the second magnetic member 24 and the first magnetic member 23 are installed with like poles facing each other. The shapes of the second magnetic member 24 and the first magnetic member 23 can be selected according to different size and position requirements, so as to meet various arrangement requirements.

[0045] In some embodiments, the ratio of the inner diameter of the second segment 14 to the inner diameter of said second end is 0.65-0.85, and taking the longitudinal section of the first segment 13 as a projection plane, the included angle between the inner wall of the first segment 13 and the central axis of the first segment 13 is 4-10 °. In this technical solution, as shown in FIG. 3, the ratio of the inner diameter D2 of the second segment 14 to the inner diameter D1 of the second end is 0.65-0.85, and the wall thickness T of the second end is 0.1-0.3 mm. Compared with the second segment 14 of a cylindrical structure, when the oil-gas mixture flows through the first segment 13, as the flow area gradually decreases, the flow velocity of the oil-gas mixture can be increased. After being discharged from the static disc, the oil-gas mixture impacts the outer surface of the oil separation structure to perform a first oil-gas separation. The cross sectional area of the second end is larger than that of the second segment 14. When the oil-gas mixture flows into the first segment 13, the flow velocity of the fluid can be reduced, and the amount of lubricating oil carried away by the exhaust gas flow from the second end can be reduced, thereby achieving higher oil separation efficiency.

[0046] The present disclosure also provides a compressor, which includes the oil separation structure 10 as described above.

[0047] In some embodiments, a housing 4 is included, which is provided with a static disc 2 and a movable disc 3, wherein the static disc 2 and the movable disc 3 cooperate to form a compression assembly. A bracket 5 is arranged on a side of the movable disc 3 facing away from the static disc 2. A cover body 1 is arranged on the housing 4, and the cover body 1 is opposite to the static disc 2. An exhaust cavity 7 is formed between the cover body 1 and the static disc 2. The cover body 1 has a hollow cavity therein, and is provided with an outlet 11 thereon. The exhaust cavity 7 communicates with the hollow cavity through the outlet 11, and the oil separation structure 10 is located in the hollow cavity. In this technical solution, a compression cavity 6 is formed between the static disc 2 and the movable disc 3, and the cover body 1, the housing 4, the bracket 5, the static disc 2 and the movable disc 3 are identical in structure to those of the existing compressor. After being discharged from the static disc, the oil-gas mixture first enters the exhaust cavity 7, and then is discharged into the hollow cavity through the outlet 11, where oil-gas separation is carried out in the oil separation structure 10.

[0048] In some embodiments, when the oil separation structure further includes a third segment 15 and a fourth segment 16, the fourth segment 16 is connected with the cover body 1, and the oil separation structure 10 divides the hollow cavity into a first cavity 9 and a second cavity 12. The cover body 1 is provided with an exhaust port which communicates with the second cavity 12, and is provided with an outlet 22 which opposes the second segment 14. The first segment 13, the second segment 14 and the third segment 15 are located within the first cavity 9, with a gap between the outer wall surfaces of the first segment 13, the second segment 14 and the third segment 15 and the inner wall surface of the first cavity 9. In this technical solution, after being discharged from the outlet 11, the oil-gas mixture first swirls along the outer wall surface of the oil separation structure, and when moving to below the first segment 13 and at the bottom of the hollow cavity, the oil-gas mixture flows back upwards, enters the first segment 13 through the second end, and rotationally moves upward along the inner walls of the first segment 13 and the second segment 14; and under the action of centrifugal force, the oil is separated onto the inner wall or the outer wall of the oil separation structure; and the oil, under the action of its own gravity, moves downwards, while the gas moves upwards until it is discharged into the second cavity 12 from the end of the second segment 14 away from the first segment 13, and finally discharged out of the compressor through the exhaust port.

[0049] In some embodiments, the cover body 1 is provided with an oil return channel 8, which is in communication with the first cavity 9, and is configured to convey oil in the first cavity 9 into the compression assembly. In this solution, the oil separated by the oil separation structure may be collected in the first cavity 9, and return to the bracket through the oil return channel 8 to lubricate two bearings in the cavity, or be discharged into the compression assembly to lubricate the static disc and the dynamic disc.

[0050] In some embodiments, the first cavity 9 has a first portion, a second portion and a third portion, wherein the second portion is located between the first portion and the third portion, the first portion opposes the second segment 14 and the third segment 15, and the first segment 13 is located in the second portion. Further, along the axial direction of the communication hole, the length of the second portion is greater than that of the first segment 13, and a plug 27 is arranged in the third portion. In some embodiments, along the direction from the second cavity 12 towards the first cavity 9, the cross-sectional area of the second portion gradually increases, and the end of the plug 27 facing the first segment 13 is conical, or the end of the plug 27 facing the first segment 13 is provided with a second groove. With the axial direction of the communication hole as a longitudinal direction of the plug 27 and the longitudinal section of the plug 27 as a projection plane, the projection plane of the second groove is in a conical shape. The opening of the oil return channel 8 is located between the plug 27 and the second portion. In this technical solution, along the direction from the second cavity 12 towards the first cavity 9, the inner wall surface 26 of the second portion is arranged obliquely, and the cross-sectional area of the second portion gradually increases, that is, the second portion 15 is flared outwards in the direction from the second cavity 12 towards the first cavity 9. Along the axial direction of the communication hole, the height of the plug 27 is less than the length of the third portion. The cross-sectional area of the second portion gradually increases along the direction from the second cavity 12 towards the first cavity 9, and as shown in Figures 11 and 12, the second portion is of a conical structure. The configuration of the second portion in a conical structure can increase the volume of the first cavity 9 to thereby accommodate more lubricating oil, which is equivalent to providing an oil storage chamber. Further, as the inner wall surface 26 of the second portion is obliquely arranged, the separated oil flows more smoothly on the inner wall surface 26, the accumulated lubricating oil may still perform centrifugal rotational movement under centrifugal force, and the oil level can remain stable when the vehicle is tilted, reducing the influence of gravity. In order to maintain the oil level in the oil storage space, a structural size ratio D4 / D3 of1.5 to 2 for the second portion yields good effects.

[0051] In some embodiments, along the axial direction of the communication hole, the third portion has a bottom surface, and a second elastic element 31 is disposed between the plug 27 and the bottom surface 25, allowing the plug 27 to move within the third portion. A first oil return hole 30 is disposed on the plug 27, and the opening of the oil return channel 8 is located between the bottom surface and the plug 27. In this technical solution, by allowing the plug 27 to move within the third portion, with the plug 27 provided with a first oil return hole 30 and the opening of the oil return channel 8 located between the bottom surface and the plug 27, when the amount of the separated oil is large, the plug 27 moves downward, thus enlarging the oil storage space; and when the amount of the separated oil is small, the distance between the plug 27 and the second end is small, so that the separated oil can be quickly collected on the plug 27 before flowing back into the housing through the oil return channel 8.

[0052] In some embodiments, along the axial direction of the communication hole, the inner side wall of the third portion is provided with a fourth groove in a ring shape, in which the plug 27 is at least partially located along the axial direction of the communication hole, the outer wall of the plug 27 is provided with a plurality of fifth grooves, which run through both ends of the plug 27. The fifth grooves and the inner wall of the third portion enclose to define second oil return holes 18, which are evenly distributed along the circumferential direction of the plug 27. The first oil return hole 30 is located in the middle of the plug 27, or there are a plurality of the first oil return holes 30 provided, which are evenly distributed on the plug 27, so that the second portion communicates with the third portion. In this technical solution, as shown in Figures 11 and 12, by providing a fourth groove in the shape of a ring on the inner side wall of the third portion along the axial direction of the communication hole, and locating the plug 27 at least partially within the fourth groove, it is more convenient to collect the separated lubricating oil. As shown in Figures 13, 14 and 15, when the compressor operates under the same working condition but at different frequencies, different rotational speeds correspond to different flow rates, resulting in different mounts of lubricating oil separated by the oil separation structure. The fixed oil separation structure described previously is difficult to adapt to separation conditions for both high and low oil flow rates: when the exhaust channel 17 is set short, it can fulfill the oil separation function at low flow rates, with the lubricating oil fully covering the oil return channel 8 and without allowing gas to entering the oil return channel 8; however, at high flow rates, the large amount of separated oil, combined with a fixed oil return rate, causes the lubricating oil to accumulate in the first cavity 9, and when the accumulated oil level is high and close to the second end, the lubricating oil is taken away from the exhaust channel 17 again, leading to a low oil separation efficiency at high flow rates. Therefore, the present disclosure provides the plug 27 and the second elastic element 31 (which may be a spring) in the first cavity 9. In the natural state, the second elastic element 31 is naturally placed to generate a natural height to support the plug 27; at this time, the axial dimension of the first cavity 9 is small, and accordingly a high separation efficiency is obtained at low flow rates. When the flow rate increases, the plug 27 may be pushed to move downward under the action of fluid against the spring force of the second elastic element 31, and at this time, a large oil separation dimension is obtained. The provision of the second oil return hole 18 and the first oil return hole 30 in the plug 27 can allow the lubricating oil at the bottom of the first cavity 9 to smoothly enter the oil return channel 8. The provision of the fourth groove limits movement of the plug 27, thereby effectively preventing axial movement of the plug 27 within the third portion.

[0053] In some embodiments, a third cavity 29 is formed between the plug 27 and the bottom surface, the oil return channel 8 communicates with the third cavity 29, and the bottom surface is provided with a third groove. With the axial direction of the communication hole as the longitudinal direction of the plug 27 and with the longitudinal section of the plug 27 as a projection plane, the projection plane of the third groove is conical. In this technical solution, the provision of the third groove significantly increases the oil storage capacity of the third cavity 29, achieving an oil storage effect.

[0054] It is readily understood by a person skilled in the art that the advantageous embodiments described above can be freely combined and superimposed without conflict.

[0055] The above are merely preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modification, equivalent substitution and improvement, etc. made within the spirit and principle of this disclosure should be included within the protection scope of this disclosure. The above is only preferred embodiments of the present disclosure, and it should be pointed out that for those skilled in the art, several improvements and variants can be made without departing from the technical principles of the present disclosure, and these improvements and variants should also be regarded as the protection scope of the present disclosure.

Examples

Embodiment Construction

[0029]The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are merely some rather than all of the embodiments of the present disclosure. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended as a limitation of the present disclosure and its application or uses. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without inventive effort shall fall within the protection scope of the present disclosure.

[0030]It should be noted that the terms used herein is merely for describing specific implementations rather than intended to limit the exemplary implementations according to the present disclosure. As used herein, unless otherwise clearly stated, the singular form is also in...

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present disclosure claims the priority right of a Chinese patent application entitled "Oil Separation Structure, and Compressor" and filed on November 10, 2023 with an application number of 202311495725.8, the disclosure of which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION Field of the Invention

[0002] The present relates the art of compressors, and particularly relates to oil separation structures and compressors.Description of Related Art

[0003] For vehicle-mounted aluminum alloy scroll compressors, there is no stable oil sump inside the compressor for allowing an oil pumping system inside the compressor to mechanically supply oil to lubricating parts. Instead, it relies on gas suction of the compressor for the refrigerant to carry the lubricating oil. Centrifugal separation is then performed on the exhaust gas to separate the lubricating oil from the refrigerant, followed by a throttling and oil return design for the lubricating oil. Therefore, the oil return efficiency of the centrifugal separation for the exhaust gas is crucial to the performance and reliability of the compressor. The existing centrifugal separation structure is very mature. The centrifugal separation structure itself features high separation efficiency, and can definitely meet the requirement of separating most of the lubricating oil from the refrigerant. However, there are significant problems in the relevant technical solutions for flow of the separated lubricating oil back into the compressor, mainly focusing on the following two aspects: 1. the arrangement of the oil return and storage structure is improper, and the oil storage structure is susceptible to the influence of the centrifugal separation structure, resulting in insufficient oil storage in the actual oil storage structure or the separated lubricating oil being carried away again by the refrigerant; 2. the oil return structure directly adopts a throttling structure to communicate high pressure with the low-pressure or medium-pressure lubricating part; due to the large throttling pressure difference, during actual operation, when the pressure difference is large, insufficient throttling will occur, causing the high-pressure gas to enter the low-pressure or medium-pressure part and thus affecting performance of the compressor; when the pressure difference is small, the oil return flow rate is too low, so the lubricating oil separated by the centrifugal separation structure cannot flow back to the compressor in time, and the excess lubricating oil remains in the separation structure and is then taken away by the refrigerant again, resulting in poor heat exchange effect of the system..

[0004] The related art proposes an internal structure of the compressor for separating oil from the exhaust gas and for oil storage. As shown in Figure 1, an exhaust cavity, an oil separator and a lubricating oil storage chamber are arranged between the back surface of a static disc of the compressor and an exhaust cover. The lubricating oil in the oil storage chamber returns to the suction chamber inside the compressor through an oil return channel, thus achieving circulation of the lubricating oil inside the compressor. However, as this kind of oil separator adopts a cylindrical design, with the inlet of the oil separator located at the bottom, the velocity of flow of the oil-gas mixture from bottom to top in the cavity where the oil separator is located is higher than the flow velocity from top to bottom at the outer side of the bottom inside the cavity. This creates a pressure difference between the inside and the outside, with lower internal pressure and higher external pressure. Consequently, the oil accumulated on the outer wall surface of the oil separator enters the interior of the oil separator through the inlet at the bottom of the oil separator, resulting in poor separation efficiency.

[0005] Due to the cylindrical design of the oil separator in the related art, the lubricating oil on the outer surface of the oil separator tends to enter the interior of the oil separator, resulting in technical problems such as poor oil-gas separation effect, so the present disclosure makes a research and designs an oil separation structure and a compressor.SUMMARY OF THE INVENTION

[0006] Therefore, the technical problem to be solved by the present disclosure is to overcome the defect in the related art that the lubricating oil on the outer surface of the oil separator tends to enter the interior of the oil separator to result in poor oil-gas separation effect, and thus provide an oil separation structure and a compressor.

[0007] In order to solve the above problem, the present disclosure provides an oil separation structure, which includes a first segment and a second segment both provided with communication holes, wherein the first segment has a first end and a second end, the first end is connected to the second segment so that the first segment is in communication with the second segment; the second segment has an inner diameter equal to that of the first end; gas flow flows in through the second end and flows out through an end of the second segment away from the first segment; and along a direction from the first end to the second end, an inner diameter of the first segment gradually increases, and an outer diameter of the first segment gradually increases.

[0008] In some embodiments, the oil separation structure further includes a third segment and a fourth segment both provided with gas flow channels, wherein the third segment has one end communicate with the fourth segment, and has the other end communicate with the second segment; along an axial direction of the communication hole, the end of the third segment facing the second segment is provided with a first groove, and an end of the second segment facing the third segment is provided with a first mounting portion, which is inserted into and engaged with the first groove; and the first mounting portion is movable within the first groove along the axial direction of the hole.

[0009] In some embodiments, an inner wall of the first groove facing the communication hole is a second mounting portion, and along a radial direction of the communication hole, the sum of a thickness of the second mounting portion and a width of the first groove is the same as a thickness of the second segment.

[0010] In some embodiments, an inner wall of the second segment is provided with a mating portion, the mating portion being located on the second segment at a position close to the third segment relative to the first end; and inside the second segment is provided a first elastic element, part of which is connected to the mating portion and the remaining part of which is connected to the second mounting portion.

[0011] In some embodiments, an inner wall of the groove is provided with a second magnetic member, the first mounting portion is provided with a first magnetic member, the second magnetic member opposes the first magnetic member, and along the axial direction of the communication hole, the second magnetic member and the first magnetic member are arranged with like poles facing each other.

[0012] In some embodiments, the second magnetic member and the first magnetic member are both annular; or, the second magnetic member and the first magnetic member are both strip-shaped; or, the second magnetic member is annular, while the first magnetic member is strip-shaped; or, the second magnetic member is strip-shaped, while the first magnetic member is annular.

[0013] In some embodiments, a ratio of the inner diameter of the second segment to an inner diameter of the second end is 0.65 to 0.85, and taking a longitudinal section of the first segment as a projection plane, an included angle between an inner wall of the first segment and a central axis of the first segment is 4 to 10 °.

[0014] The present disclosure also provides a compressor including the oil separation structure as stated above.

[0015] In some embodiments, the compressor includes a housing equipped with a static disc and a movable disc, wherein the static disc and the movable disc cooperate to form a compression assembly; a bracket is arranged on a side of the movable disc away from the static disc; on the housing is disposed a cover body, which opposes the static disc; an exhaust cavity is formed between the cover body and the static disc; the cover body has a hollow cavity therein, and is provided with an outlet thereon; the exhaust cavity communicates with the hollow cavity through the outlet, and the oil separation structure is located in the hollow cavity.

[0016] In some embodiments, when the oil separation structure further includes a third segment and a fourth segment, the fourth segment is connected with the cover body; the oil separation structure divides the hollow cavity into a first cavity and a second cavity; the cover body is provided with an exhaust port which communicates with the second cavity, and is provided with an outlet which opposes the second segment; and the first segment, the second segment and the third segment are located within the first cavity, with a gap between outer wall surfaces of the first segment, the second segment and the third segment and an inner wall surface of the first cavity.

[0017] In some embodiments, the cover body is provided with an oil return channel, which communicates with the first cavity, is configured to convey oil in the first cavity into the compression assembly.

[0018] In some embodiments, the first cavity has a first portion, a second portion and a third portion, wherein the second portion is located between the first portion and the third portion; the first portion opposes the second segment and the third segment; the first segment is located in the second portion; further, along the axial direction of the communication hole, a length of the second portion is greater than that of the first segment; and a plug is arranged in the third portion.

[0019] In some embodiments, along a direction from the second cavity towards the first cavity, a cross-sectional area of the second portion gradually increases, and an end of the plug facing the first segment is conical, or the end of the plug facing the first segment is provided with a second groove; and with the axial direction of the communication hole taken as a longitudinal direction of the plug and a longitudinal section of the plug taken as a projection plane, a projection plane of the second groove is in a conical shape; and an opening of the oil return channel is loc ated between the plug and the second portion.

[0020] In some embodiments, along the axial direction of the communication hole, the third portion has a bottom surface, and a second elastic element is disposed between the plug and the bottom surface, allowing the plug to be movable within the third portion; a first oil return hole is disposed on the plug; and an opening of the oil return channel is located between the bottom surface and the plug.

[0021] In some embodiments, along the axial direction of the communication hole, an inner side wall of the third portion is provided with a fourth groove in annular shape, in which the plug is at least partially located;

[0022] along the axial direction of the communication hole, an outer wall of the plug is provided with a plurality of fifth grooves, which run through both ends of the plug; the fifth grooves and the inner wall of the third portion enclose to define second oil return holes, a plurality of which are evenly distributed along a circumferential direction of the plug; the first oil return hole is located in the middle of the plug, or there are a plurality of the first oil return holes provided, which are evenly distributed on the plug, so that the second portion communicates with the third portion.

[0023] In some embodiments, a third cavity is formed between the plug and the bottom surface, the oil return channel communicates with the third cavity, and the bottom surface is provided with a third groove; and with the axial direction of the communication hole taken as a longitudinal direction of the plug, and a longitudinal section of the plug taken as a projection plane, a projection plane of the third groove is conical.

[0024] The oil separation structure and compressor provided in the present disclosure have the following beneficial effects:

[0025] By having the inner diameter of the first segment gradually increase along the direction from the first end towards the second end, the first segment is flared. With the axial section of the first end taken as a projection plane, the first segment is in conical shape. After being discharged from a static disc, the oil-gas mixture first rotationally moves along the outer wall surface of the oil separation structure; when moving to below the first segment, the oil-gas mixture flows back upwards, enters the first segment through the second end, and then rotationally moves upward along the inner walls of the first segment and the second segment; under the action of centrifugal force, the oil is separated onto the inner wall or the outer wall of the oil separation structure; the oil moves downwards under the action of its own gravity, while the gas moves upward until it is discharged from the end of the second segment away from the first segment. The flared arrangement of the first segment reduces the flow velocity of the gas entering the oil separation structure, thereby preventing the oil on the outer wall surface of the oil separation structure from entering the interior of the oil separation structure through the inlet. Further, the flow velocity of the gas flowing from the first segment to the second segment is increased due to gradual reduction of the inner diameter, thereby improving the oil-gas separation rate in the second segment, and improving the oil-gas separation effect of the oil separation structure.BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present disclosure or technical solutions in the related art, drawings required for describing the embodiments or the related art will be briefly provided below. It is obvious that the drawings described below are merely exemplary and those skilled in the art can derive other implementation drawings based on the drawings provided without paying inventive effort.

[0027] The structures, proportions, sizes and the like shown in the specification are only used to cooperate with the contents disclosed in the specification for understanding and reading of those skilled in the art, and are not intended to limit the conditions under which the present disclosure can be implemented. Therefore, they have no substantial technical significance. Any modification in structure, change in proportional relationship, or adjustment of the size, shall still fall within the scope covered by the technical contents disclosed in the present disclosure, as long as it does not affect the efficacy and the achievable purpose of the present disclosure. Figure 1 is a schematic view of a partial structure of a compressor in the prior art. Figure 2 is an assembly view of an oil separation structure according to an embodiment of the present disclosure. Figure 3 is a schematic view of an oil separation structure according to an embodiment of the disclosure. Figure 4 is a schematic view showing a connection structure between a second segment and a third segment of an oil separation structure according to an embodiment of the present disclosure. Figure 5 is a schematic view showing the moving states of the second segment and the third segment of the oil separation structure according to an embodiment of the present disclosure. Figure 6 is a schematic view showing the connection structure between the second segment and the third segment of the oil separation structure according to another embodiment of the present disclosure. Figure 7 is a schematic view showing the moving states of the second segment and the third segment of the oil separation structure according to another embodiment of the present disclosure. Figure 8 is a top view of the oil separation structure according to another embodiment of the present disclosure. Figure 9 is a top view of the oil separation structure according to a third embodiment of the present disclosure. Figure 10 is a schematic layout view of a first magnetic member and a second magnetic member of the oil separation structure according to an embodiment of the present disclosure. Figure 11 is a partial schematic view of a compressor according to embodiments of the present disclosure. Figure 12 is a partial schematic view of the compressor according to a first embodiment of the present disclosure. Figure 13 is a partial schematic view of the compressor according to a second embodiment of the present disclosure. Figure 14 is a schematic view of a plug of the compressor according to an embodiment of the present disclosure. Figure 15 is a schematic view of the plug of the compressor according to another embodiment of the present disclosure. Figure 16 is a partial schematic view of the compressor according to a third embodiment of the present disclosure.

[0028] Reference signs: 1. cover body; 2. static disc; 3. movable disc; 4. housing; 5. bracket; 6. compression cavity; 7. exhaust cavity; 8. oil return channel; 9. first cavity; 10. oil separation structure; 11. outlet; 12. second cavity; 13. first segment; 14. second segment; 15. third segment; 16. fourth segment; 17. exhaust channel; 18. second oil return hole; 19. mating portion; 20. first mounting portion; 21. first elastic element; 22. second mounting portion; 23. first magnetic member; 24. second magnetic member; 25. limiting portion; 26. inner wall surface; 27. plug; 28. inlet; 29. third cavity; 30. first oil return hole; 31. second elastic element.DESCRIPTION OF THE INVENTION

[0029] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are merely some rather than all of the embodiments of the present disclosure. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended as a limitation of the present disclosure and its application or uses. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without inventive effort shall fall within the protection scope of the present disclosure.

[0030] It should be noted that the terms used herein is merely for describing specific implementations rather than intended to limit the exemplary implementations according to the present disclosure. As used herein, unless otherwise clearly stated, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the stated features, steps, operations, devices, assemblies and / or combinations thereof.

[0031] It should be understood that the term "and / or" used herein merely describes an association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may indicate three cases: A exists alone, both A and B exist, and B exists alone. In addition, the symbol " / " used herein generally indicates that the associated objects preceding and following it have an "or" relationship.

[0032] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure. Meanwhile, it should be understood that the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships for ease of description. The technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices shall be deemed part of the granted specification. In all examples shown and discussed herein, any specific values shall be construed as merely illustrative rather than restrictive. Accordingly, other examples of the exemplary embodiments may have different values. It should be noted that like reference signs and letters denote like items in the following drawings; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0033] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom", etc. are generally based on the accompanying drawings. This is merely for the convenience of describing the present disclosure and simplifying the description. Unless specified otherwise, these orientation terms do not indicate or imply that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation, and thus shall not be construed as limiting the protection scope of the present disclosure. The orientation terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0034] For ease of description, spatially relative terms such as "on...", "above...", "on the upper surface of...", and "upper" may be used herein to describe the spatial positional relationship between one device or feature and other devices or features as shown in the drawings. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if a device in the drawings is inverted, the device described as "above" or "on" other devices or structures would then be positioned "below" or "underneath" the other devices or structures. Thus, the exemplary term "above..." may encompass both orientations of "above..." and "below...". The device may also be positioned in other different ways (rotated by 90 degrees or at other orientations), and corresponding interpretations shall be made to the spatially relative descriptions used herein.

[0035] In addition, it should be noted that the use of terms such as "first", "second", etc. to define components is merely for the convenience of distinguishing the corresponding components. Unless otherwise stated, the aforesaid terms have no special meanings and thus shall not be construed as limiting the protection scope of the present disclosure.

[0036] With reference to Figures 1 to 16, according to an embodiment of the present disclosure, there is provided an oil separation structure, which includes a first segment 13 and a second segment 14 both provided with communication holes. The first segment 13 has a first end and a second end, wherein the first end is connected to the second segment 14 so that the first segment 13 is in communication with the second segment 14. The second segment 14 has an inner diameter the same as that of the first end. Gas flow flows in through the second end and flows out through an end of the second segment 14 away from the first segment 13. Along a direction from the first end to the second end, the inner diameter of the first segment 13 gradually increases, and the outer diameter of the first segment 13 also gradually increases. In this technical solution, by making the inner diameter of the first segment 13 gradually increase along a direction from the first end to the second end, the first segment 13 is flared. Taking the axial section of the first end as a projection plane, the first segment 13 is conical in shape. After being discharged from a static disc, an oil-gas mixture firstly rotationally moves along the outer wall surface of an oil separation structure; when moving to below the first segment 13, the oil-gas mixture flows back upwards, enters the first segment 13 through the second end, and then rotationally moves upward along the inner walls of the first segment 13 and the second segment 14; under the action of centrifugal force, the oil is separated onto the inner wall or the outer wall of the oil separation structure; the oil moves downwards under the action of its own gravity, while the gas moves upward until it is discharged from the end of the second segment 14 away from the first segment 13. The flared arrangement of the first segment 13 reduces the flow velocity of the gas entering the oil separation structure, thereby preventing the oil on the outer wall surface of the oil separation structure from entering the interior of the oil separation structure through the inlet. In addition, the flow velocity of the gas flowing from the first segment 13 to the second segment 14 is gradually increased due to gradual reduction of the inner diameter, thereby improving the oil-gas separation rate in the second segment 14, and improving the oil-gas separation effect of the oil separation structure; the gradually increasing outer diameter of the first segment 13 narrows the flow area of the oil-gas mixture as it flows out from the outlet to the first cavity 9 along the outer wall of the oil separation structure, thereby increasing its flow velocity, and preventing the oil on the outer wall surface of the oil separation structure from entering the interior of the oil separation structure through the oil outlet.

[0037] The compressor structure in the related art mainly includes a compressor upper cover, a static disc, a movable disc, and a compressor drive support structure. An exhaust cavity, an oil separation chamber and an oil storage chamber are formed between the static disc and the upper cover of the compressor. The oil storage chamber is arranged below the oil separation chamber, i.e., in the direction of gravity. The highest oil level in the oil storage chamber corresponds to the bottommost oil outlet of the oil separation chamber, and the highest liquid level in the oil storage chamber needs to be lower than the oil outlet of the oil separation chamber; otherwise, the lubricating oil may enter the separation chamber and affect the oil separation effect. However, when the compressor undergoes positional change with the vehicle travelling uphill or downhill or with the road surface jolting, the oil level in such an oil storage chamber becomes unstable, making it difficult to achieve normal oil return to the oil sump and prone to air channeling. In addition, the structural position arrangement of the exhaust cavity, the oil separation chamber and the oil storage chamber requires the upper cover to be designed with a large volume, resulting in an increase in the size and weight of the compressor. The limited axial oil separation length of the oil separation chamber also leads to a reduction in the actual oil separation efficiency.

[0038] Referring to FIG. 1, in the related art, a compressor includes a housing, a bracket, a movable disc, a static disc, an upper cover, and a driving member. By arranging oil return channels in the upper cover, the static disc and the bracket of the compressor, the lubricating oil separated by the exhaust and oil-separation structure in the upper cover is returned to the cavity inside the bracket. As the oil separation channel formed between the oil separation structure and the upper cover is in a fixed form, it only has excellent oil-gas separating efficiency at a rated design of flow rate, and the separation efficiency is unsatisfactory at other flow rates, resulting in poor adaptability to full operating conditions.

[0039] In some embodiments, the oil separation structure further includes a third segment 15 and a fourth segment 16 both provided with gas flow channels. One end of the third segment 15 communicates with the fourth segment 16, and the other end of the third segment 15 communicates with the second segment 14. The second segment 14 has a constant inner diameter. Along a direction from the second segment 14 to the fourth segment 16, the inner diameters of the third segment 15 and the fourth segment 16 gradually increase. The inner diameter of said the other end of the third segment 15 is the same as that of the second segment 14. In this technical solution, with reference to Figures2 and 3, the inner diameter of said one end of the third segment 15 is consistent with the inner diameter of an end of the fourth segment 16 in connection with the third segment 15. The inner walls of the third segment 15 and the fourth segment 16 are connected with a smooth transition, and the outer walls of the second segment 14, the third segment 15 and the fourth segment 16 are also connected with a smooth transition. In some embodiments, the second segment 14, the third segment 15 and the fourth segment 16 may be integrally formed. The gas flow channels are in communication with the communication holes to form an exhaust channel 17. Gas flow flows in through the second end and is discharged from the fourth segment 16. During installation, the oil separation structure is disposed inside the cover body 1, and a first cavity 9 is formed between the oil separation structure and the cover body 1. After being discharged from the static disc, the gas flow swirls downward along the inner wall of the first cavity 9, turns back at the bottom of the first cavity 9, and then enters the second end. When the oil and the refrigerant flows through the gap between the outer wall of the oil separation structure and the inner wall of the first cavity 9, part of the lubricating oil will adhere to the outer wall of the oil separation structure 10. In the related art, the velocity of the gas flow moving upward from the bottom is higher than that moving downward from the top, which creates a pressure difference between the inside and the outside of the oil separation structure, resulting in a lower pressure inside the structure and a higher pressure outside the structure. Consequently, the oil accumulated on the outer wall surface of the oil separation structure 10 may enter the oil separation structure through the second end. However, in the present disclosure, a flared first segment 13 is adopted, which reduces the velocity of the gas flow at the second end, thereby reducing the internal-external pressure difference and preventing the oil accumulated on the outer wall surface of the oil separation structure 10 from entering the interior of the oil separation structure through the second end.

[0040] In some embodiments, along the axial direction of the communication hole, the end of the third segment 15 facing the second segment 14 is provided with a first groove, the end of the second segment 14 facing the third segment 15 is provided with a first mounting portion 20, and the first mounting portion 20 is inserted into and engaged with the first groove. The first mounting portion 20 is movable inside the first groove along the axial direction of the communication hole. In this technical solution, the first groove is an annular groove, and the first mounting portion 20 is movable inside the first groove, thereby capable of increasing the length of the exhaust channel 17, extending the flow path of the oil-gas mixture in the oil separation structure, and accordingly improving the oil-gas separation effect.

[0041] In some embodiments, the inner wall of the first groove facing the communication hole is a second mounting portion 22, and along the radial direction of the communication hole, the sum of the thickness of the second mounting portion 22 and the width of the first groove is the same as the thickness of the second segment 14. In this technical solution, along the radial direction of the communication hole, the outer wall of the first mounting portion 20 is smoothly transitionally connected with the outer wall of the second segment 14, and a stepped structure is formed between the inner wall of the second segment 14 and the inner wall of the first mounting portion 20; along the radial direction of the communication hole, the sum of the thickness of the second mounting portion 22 and the width of the first groove is the same as the thickness of the second segment 14, such that a limiting structure is formed between the second segment 14 and an open end of the first groove. An end surface of the second mounting portion 22 facing the first end constitutes a limiting portion 25, and the limiting portion 25 forms a limiting fit with the second segment 14, thus ensuring that the first mounting portion 20 is completely inserted into the first groove.

[0042] In some embodiments, the inner wall of the second segment 14 is provided with a mating portion 19, which is located on the second segment 14 at a position closer to the third segment 15 relative to the first end. Inside the second segment 14 is disposed a first elastic element 21; a part of the first elastic element 21 is connected to the mating portion 19 and the rest part is connected to the second mounting portion 22. In this technical solution, the first elastic element 21 is a spring, and the first elastic element 21 is located in the communication hole of the second segment 14, as shown in Figures 4 and 5. In the actual operation process of the compressor, the compressor may operate at different flow rates due to the change in the ambient temperature. The separation principle of the oil separation structure is that: by means of the rotational centrifugal movement of the oil-gas mixture in the oil separation channel, the lubricating oil with high density is 'thrown' to the hole wall of the exhaust channel under the action of centrifugal force to achieve oil-gas separation. Therefore, the flow velocities of the fluid entering the gas inlet channel are different due to different flow rates. At low flow rates, the flow velocity of the oil-gas mixture is low, accordingly requiring the separation speed to be high, while at high flow rates, the flow velocity of the oil-gas mixture is high, thus allowing a reduced separation speed. Therefore, in order to improve the separation efficiency at low flow rates, the axial length of the oil separator is reduced to increase the flow velocity of the oil-gas mixture in the exhaust channel 17. Therefore, a long axial length may be set at high flow rates, and the axial length can be axially reduced under the elastic action of the first elastic element 21 at low flow rates. Referring to FIG. 5, the oil separator has a first segment 13, so an axial impact is generated during flow of the fluid, wherein the impact force is large at high flow rates and small at low flow rates, and when the impact force is less than the resilience force of the first elastic element 21, the second segment 14 is pulled back by the first elastic element 21, and the axial length of the exhaust channel 17 is reduced.

[0043] In some embodiments, the inner wall of the groove is provided with a second magnetic member 24, and the first mounting portion 20 is provided with a first magnetic member 23. The second magnetic member 24 is opposite to the first magnetic member 23, and along the axial direction of the communication hole, the second magnetic member 24 and the first magnetic member 23 are arranged with like poles facing each other. In this technical solution, referring to Figures 6 and 7, in the actual operation process of the compressor, the compressor may operate at different flow rates due to the change in the ambient temperature. The separation principle of the oil separation structure is that: by means of the rotational centrifugal movement of the oil-gas mixture in the oil separation channel, the lubricating oil with high density is "thrown'" to the hole wall of the exhaust channel under the action of centrifugal force to achieve oil-gas separation. Therefore, the flow velocities of the fluid entering the gas inlet channel are different due to different flow rates. At low flow rates, the flow velocity of the oil-gas mixture is low, accordingly requiring the separation speed to be high, while at high flow rates, the flow velocity of the oil-gas mixture is high, thus allowing a reduced separation speed. Therefore, in order to improve the separation efficiency at low flow rates, the axial length of the oil separator is reduced to increase the flow velocity of the oil-gas mixture in the exhaust channel 17. Therefore, through the second magnetic member 24 and the first magnetic member 23, the third segment 15 and the second segment 14 are in the position shown in FIG. 6 under natural conditions due to the magnetic attraction. When the flow velocity of the fluid is high, the force acting on the first segment 13 increases, and when the force exceeds the magnetic attraction force, the third segment 15 moves relative to the second segment 14. According to the maximum oil flow rate and the magnetic attraction force, the parameters of the two can be designed accordingly, so that the offset dimension between the first and second magnetic members can still maintain the magnetic attraction at the maximum flow rate, and the offset dimension can be reduced back when the flow rate decreases.

[0044] In some embodiments, the second magnetic member 24 and the first magnetic member 23 are both annular; or, the second magnetic member 24 and the first magnetic member 23 are both strip-shaped; or, the second magnetic member 24 is annular, while the first magnetic member 23 is strip-shaped; or, the second magnetic member 24 is strip-shaped, while the first magnetic member 23 is annular. In this technical solution, as shown in Figures 8, 9 and 10, the second magnetic member 24 and the first magnetic member 23 are installed with like poles facing each other. The shapes of the second magnetic member 24 and the first magnetic member 23 can be selected according to different size and position requirements, so as to meet various arrangement requirements.

[0045] In some embodiments, the ratio of the inner diameter of the second segment 14 to the inner diameter of said second end is 0.65-0.85, and taking the longitudinal section of the first segment 13 as a projection plane, the included angle between the inner wall of the first segment 13 and the central axis of the first segment 13 is 4-10 °. In this technical solution, as shown in FIG. 3, the ratio of the inner diameter D2 of the second segment 14 to the inner diameter D1 of the second end is 0.65-0.85, and the wall thickness T of the second end is 0.1-0.3 mm. Compared with the second segment 14 of a cylindrical structure, when the oil-gas mixture flows through the first segment 13, as the flow area gradually decreases, the flow velocity of the oil-gas mixture can be increased. After being discharged from the static disc, the oil-gas mixture impacts the outer surface of the oil separation structure to perform a first oil-gas separation. The cross sectional area of the second end is larger than that of the second segment 14. When the oil-gas mixture flows into the first segment 13, the flow velocity of the fluid can be reduced, and the amount of lubricating oil carried away by the exhaust gas flow from the second end can be reduced, thereby achieving higher oil separation efficiency.

[0046] The present disclosure also provides a compressor, which includes the oil separation structure 10 as described above.

[0047] In some embodiments, a housing 4 is included, which is provided with a static disc 2 and a movable disc 3, wherein the static disc 2 and the movable disc 3 cooperate to form a compression assembly. A bracket 5 is arranged on a side of the movable disc 3 facing away from the static disc 2. A cover body 1 is arranged on the housing 4, and the cover body 1 is opposite to the static disc 2. An exhaust cavity 7 is formed between the cover body 1 and the static disc 2. The cover body 1 has a hollow cavity therein, and is provided with an outlet 11 thereon. The exhaust cavity 7 communicates with the hollow cavity through the outlet 11, and the oil separation structure 10 is located in the hollow cavity. In this technical solution, a compression cavity 6 is formed between the static disc 2 and the movable disc 3, and the cover body 1, the housing 4, the bracket 5, the static disc 2 and the movable disc 3 are identical in structure to those of the existing compressor. After being discharged from the static disc, the oil-gas mixture first enters the exhaust cavity 7, and then is discharged into the hollow cavity through the outlet 11, where oil-gas separation is carried out in the oil separation structure 10.

[0048] In some embodiments, when the oil separation structure further includes a third segment 15 and a fourth segment 16, the fourth segment 16 is connected with the cover body 1, and the oil separation structure 10 divides the hollow cavity into a first cavity 9 and a second cavity 12. The cover body 1 is provided with an exhaust port which communicates with the second cavity 12, and is provided with an outlet 22 which opposes the second segment 14. The first segment 13, the second segment 14 and the third segment 15 are located within the first cavity 9, with a gap between the outer wall surfaces of the first segment 13, the second segment 14 and the third segment 15 and the inner wall surface of the first cavity 9. In this technical solution, after being discharged from the outlet 11, the oil-gas mixture first swirls along the outer wall surface of the oil separation structure, and when moving to below the first segment 13 and at the bottom of the hollow cavity, the oil-gas mixture flows back upwards, enters the first segment 13 through the second end, and rotationally moves upward along the inner walls of the first segment 13 and the second segment 14; and under the action of centrifugal force, the oil is separated onto the inner wall or the outer wall of the oil separation structure; and the oil, under the action of its own gravity, moves downwards, while the gas moves upwards until it is discharged into the second cavity 12 from the end of the second segment 14 away from the first segment 13, and finally discharged out of the compressor through the exhaust port.

[0049] In some embodiments, the cover body 1 is provided with an oil return channel 8, which is in communication with the first cavity 9, and is configured to convey oil in the first cavity 9 into the compression assembly. In this solution, the oil separated by the oil separation structure may be collected in the first cavity 9, and return to the bracket through the oil return channel 8 to lubricate two bearings in the cavity, or be discharged into the compression assembly to lubricate the static disc and the dynamic disc.

[0050] In some embodiments, the first cavity 9 has a first portion, a second portion and a third portion, wherein the second portion is located between the first portion and the third portion, the first portion opposes the second segment 14 and the third segment 15, and the first segment 13 is located in the second portion. Further, along the axial direction of the communication hole, the length of the second portion is greater than that of the first segment 13, and a plug 27 is arranged in the third portion. In some embodiments, along the direction from the second cavity 12 towards the first cavity 9, the cross-sectional area of the second portion gradually increases, and the end of the plug 27 facing the first segment 13 is conical, or the end of the plug 27 facing the first segment 13 is provided with a second groove. With the axial direction of the communication hole as a longitudinal direction of the plug 27 and the longitudinal section of the plug 27 as a projection plane, the projection plane of the second groove is in a conical shape. The opening of the oil return channel 8 is located between the plug 27 and the second portion. In this technical solution, along the direction from the second cavity 12 towards the first cavity 9, the inner wall surface 26 of the second portion is arranged obliquely, and the cross-sectional area of the second portion gradually increases, that is, the second portion 15 is flared outwards in the direction from the second cavity 12 towards the first cavity 9. Along the axial direction of the communication hole, the height of the plug 27 is less than the length of the third portion. The cross-sectional area of the second portion gradually increases along the direction from the second cavity 12 towards the first cavity 9, and as shown in Figures 11 and 12, the second portion is of a conical structure. The configuration of the second portion in a conical structure can increase the volume of the first cavity 9 to thereby accommodate more lubricating oil, which is equivalent to providing an oil storage chamber. Further, as the inner wall surface 26 of the second portion is obliquely arranged, the separated oil flows more smoothly on the inner wall surface 26, the accumulated lubricating oil may still perform centrifugal rotational movement under centrifugal force, and the oil level can remain stable when the vehicle is tilted, reducing the influence of gravity. In order to maintain the oil level in the oil storage space, a structural size ratio D4 / D3 of1.5 to 2 for the second portion yields good effects.

[0051] In some embodiments, along the axial direction of the communication hole, the third portion has a bottom surface, and a second elastic element 31 is disposed between the plug 27 and the bottom surface 25, allowing the plug 27 to move within the third portion. A first oil return hole 30 is disposed on the plug 27, and the opening of the oil return channel 8 is located between the bottom surface and the plug 27. In this technical solution, by allowing the plug 27 to move within the third portion, with the plug 27 provided with a first oil return hole 30 and the opening of the oil return channel 8 located between the bottom surface and the plug 27, when the amount of the separated oil is large, the plug 27 moves downward, thus enlarging the oil storage space; and when the amount of the separated oil is small, the distance between the plug 27 and the second end is small, so that the separated oil can be quickly collected on the plug 27 before flowing back into the housing through the oil return channel 8.

[0052] In some embodiments, along the axial direction of the communication hole, the inner side wall of the third portion is provided with a fourth groove in a ring shape, in which the plug 27 is at least partially located along the axial direction of the communication hole, the outer wall of the plug 27 is provided with a plurality of fifth grooves, which run through both ends of the plug 27. The fifth grooves and the inner wall of the third portion enclose to define second oil return holes 18, which are evenly distributed along the circumferential direction of the plug 27. The first oil return hole 30 is located in the middle of the plug 27, or there are a plurality of the first oil return holes 30 provided, which are evenly distributed on the plug 27, so that the second portion communicates with the third portion. In this technical solution, as shown in Figures 11 and 12, by providing a fourth groove in the shape of a ring on the inner side wall of the third portion along the axial direction of the communication hole, and locating the plug 27 at least partially within the fourth groove, it is more convenient to collect the separated lubricating oil. As shown in Figures 13, 14 and 15, when the compressor operates under the same working condition but at different frequencies, different rotational speeds correspond to different flow rates, resulting in different mounts of lubricating oil separated by the oil separation structure. The fixed oil separation structure described previously is difficult to adapt to separation conditions for both high and low oil flow rates: when the exhaust channel 17 is set short, it can fulfill the oil separation function at low flow rates, with the lubricating oil fully covering the oil return channel 8 and without allowing gas to entering the oil return channel 8; however, at high flow rates, the large amount of separated oil, combined with a fixed oil return rate, causes the lubricating oil to accumulate in the first cavity 9, and when the accumulated oil level is high and close to the second end, the lubricating oil is taken away from the exhaust channel 17 again, leading to a low oil separation efficiency at high flow rates. Therefore, the present disclosure provides the plug 27 and the second elastic element 31 (which may be a spring) in the first cavity 9. In the natural state, the second elastic element 31 is naturally placed to generate a natural height to support the plug 27; at this time, the axial dimension of the first cavity 9 is small, and accordingly a high separation efficiency is obtained at low flow rates. When the flow rate increases, the plug 27 may be pushed to move downward under the action of fluid against the spring force of the second elastic element 31, and at this time, a large oil separation dimension is obtained. The provision of the second oil return hole 18 and the first oil return hole 30 in the plug 27 can allow the lubricating oil at the bottom of the first cavity 9 to smoothly enter the oil return channel 8. The provision of the fourth groove limits movement of the plug 27, thereby effectively preventing axial movement of the plug 27 within the third portion.

[0053] In some embodiments, a third cavity 29 is formed between the plug 27 and the bottom surface, the oil return channel 8 communicates with the third cavity 29, and the bottom surface is provided with a third groove. With the axial direction of the communication hole as the longitudinal direction of the plug 27 and with the longitudinal section of the plug 27 as a projection plane, the projection plane of the third groove is conical. In this technical solution, the provision of the third groove significantly increases the oil storage capacity of the third cavity 29, achieving an oil storage effect.

[0054] It is readily understood by a person skilled in the art that the advantageous embodiments described above can be freely combined and superimposed without conflict.

[0055] The above are merely preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modification, equivalent substitution and improvement, etc. made within the spirit and principle of this disclosure should be included within the protection scope of this disclosure. The above is only preferred embodiments of the present disclosure, and it should be pointed out that for those skilled in the art, several improvements and variants can be made without departing from the technical principles of the present disclosure, and these improvements and variants should also be regarded as the protection scope of the present disclosure.

Examples

Embodiment Construction

[0029]The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are merely some rather than all of the embodiments of the present disclosure. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended as a limitation of the present disclosure and its application or uses. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without inventive effort shall fall within the protection scope of the present disclosure.

[0030]It should be noted that the terms used herein is merely for describing specific implementations rather than intended to limit the exemplary implementations according to the present disclosure. As used herein, unless otherwise clearly stated, the singular form is also in...

Claims

1. An oil separation structure, comprising a first segment (13) and a second segment (14) both provided with communication holes, wherein the first segment (13) has a first end and a second end, the first end is connected to the second segment (14) to allow a communication between the first segment (13) and the second segment (14); the second segment (14) has an inner diameter equal to that of the first end; gas flow flows in through the second end and flows out through an end of the second segment (14) away from the first segment (13); and along a direction from the first end to the second end, an inner diameter of the first segment (13) gradually increases, and an outer diameter of the first segment (13) gradually increases.

2. The oil separation structure according to claim 1, wherein the oil separation structure further comprises a third segment (15) and a fourth segment (16) both provided with gas flow channels, wherein the third segment (15) has one end communicate with the fourth segment (16), and has the other end communicate with the second segment (14); along an axial direction of the communication hole, the end of the third segment (15) facing the second segment (14) is provided with a first groove, and an end of the second segment (14) facing the third segment (15) is provided with a first mounting portion (20), which is inserted into and engaged with the first groove; and the first mounting portion (20) is movable within the first groove along the axial direction of the communication hole.

3. The oil separation structure according to claim 2, wherein an inner wall of the first groove facing the communication hole is a second mounting portion (22), and along a radial direction of the communication hole, the sum of a thickness of the second mounting portion (22) and a width of the first groove is the same as a thickness of the second segment (14).

4. The oil separation structure according to claim 3, wherein an inner wall of the second segment (14) is provided with a mating portion (19), the mating portion (19) being located on the second segment (14) at a position close to the third segment (15) relative to the first end; and inside the second segment (14) is provided a first elastic element (21), part of which is connected to the mating portion (19) and the remaining part of which is connected to the second mounting portion (22).

5. The oil separation structure according to claim 3, wherein an inner wall of the first groove is provided with a second magnetic member (24), the first mounting portion (20) is provided with a first magnetic member (23), the second magnetic member (24) opposes the first magnetic member (23), and along the axial direction of the communication hole, the second magnetic member and the first magnetic member are arranged with like poles facing each other.

6. The oil separation structure according to claim 5, wherein the second magnetic member (24) and the first magnetic member (23) are both annular; or, the second magnetic member (24) and the first magnetic member (23) are both strip-shaped; or, the second magnetic member (24) is annular, while the first magnetic member (23) is strip-shaped;or, the second magnetic member (24) is strip-shaped, while the first magnetic member (23) is annular.

7. The oil separation structure according to claim 1, wherein a ratio of the inner diameter of the second segment (14) to an inner diameter of the second end is 0.65 to 0.85, and taking a longitudinal section of the first segment (13) as a projection plane, an included angle between an inner wall of the first segment (13) and a central axis of the first segment (13) is 4 to 10 °.

8. A compressor, comprising the oil separation structure (10) according to any of claims 1 to 7.

9. The compressor according to claim 8, wherein the compressor comprises a housing (4) equipped with a static disc (2) and a movable disc (3), wherein the static disc (2) and the movable disc (3) cooperate to form a compression assembly; a bracket (5) is arranged on a side of the movable disc (3) away from the static disc (2); on the housing (4) is disposed a cover body (1), which opposes the static disc (2); an exhaust cavity (7) is formed between the cover body (1) and the static disc (2); the cover body (1) has a hollow cavity therein, and is provided with an outlet (11) thereon; the exhaust cavity (7) communicates with the hollow cavity through the outlet (11), and the oil separation structure (10) is located in the hollow cavity.

10. The compressor according to claim 9, wherein when the oil separation structure further comprises a third segment (15) and a fourth segment (16), the fourth segment (16) is connected with the cover body (1); the oil separation structure (10) divides the hollow cavity into a first cavity (9) and a second cavity (12); the cover body (1) is provided with an exhaust port which communicates with the second cavity (12), and is provided with an outlet (22) which opposes the second segment (14); and the first segment (13), the second segment (14) and the third segment (15) are located within the first cavity (9), with a gap between outer wall surfaces of the first segment (13), the second segment (14) and the third segment (15) and an inner wall surface of the first cavity (9).

11. The compressor according to claim 10, wherein the cover body (1) is provided with an oil return channel (8), which communicates with the first cavity (9), and is configured to convey oil in the first cavity (9) into the compression assembly.

12. The compressor according to claim 11, wherein the first cavity (9) has a first portion, a second portion and a third portion, wherein the second portion is located between the first portion and the third portion; the first portion opposes the second segment (14) and the third segment (15); the first segment (13) is located in the second portion; further, along the axial direction of the communication hole, a length of the second portion is greater than that of the first segment (13); and a plug (27) is arranged in the third portion.

13. The compressor according to claim 12, wherein along a direction from the second cavity (12) towards the first cavity (9), a cross-sectional area of the second portion gradually increases, and an end of the plug (27) facing the first segment (13) is conical, or the end of the plug (27) facing the first segment (13) is provided with a second groove; and with the axial direction of the communication hole taken as a longitudinal direction of the plug (27) and a longitudinal section of the plug (27) taken as a projection plane, a projection plane of the second groove is in a conical shape; and an opening of the oil return channel (8) is located between the plug (27) and the second portion.

14. The compressor according to claim 12, wherein along the axial direction of the communication hole, the third portion has a bottom surface, and a second elastic element (31) is disposed between the plug (27) and the bottom surface, allowing the plug (27) to be movable within the third portion; a first oil return hole (30) is disposed on the plug (27); and an opening of the oil return channel (8) is located between the bottom surface and the plug (27).

15. The compressor according to claim 14, wherein along the axial direction of the communication hole, an inner side wall of the third portion is provided with a fourth groove of annular shape, in which the plug (27) is at least partially located; along the axial direction of the communication hole, an outer wall of the plug (27) is provided with a plurality of fifth grooves, which run through both ends of the plug (27); the fifth grooves and the inner wall of the third portion enclose to define second oil return holes (18), a plurality of which are evenly distributed along a circumferential direction of the plug (27); the first oil return hole (30) is located in the middle of the plug (27), or there are a plurality of the first oil return holes (30) provided, which are evenly distributed on the plug (27), thereby achieving communication between the second portion and the third portion.

16. The compressor according to claim 14, wherein a third cavity (29) is formed between the plug (27) and the bottom surface, the oil return channel (8) communicates with the third cavity (29), and the bottom surface is provided with a third groove; and with the axial direction of the communication hole taken as a longitudinal direction of the plug (27), and a longitudinal section of the plug (27) taken as a projection plane, a projection plane of the third groove is conical.

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