Oil return throttling device and scroll compressor

Abstract

The application provides an oil return throttling device and a scroll compressor. The oil return throttling device is in a columnar structure and comprises two end faces and a side face. The side face is provided with an oil inlet channel extending to one end face, an oil outlet channel extending to the other end face, and a meandering channel communicating the oil inlet channel and the oil outlet channel. The oil return throttling device of the application is provided with the meandering channel. When the oil return throttling device is arranged in the oil return channel of the compressor, the axial space can be used multiple times, that is, a longer throttling distance is formed in a smaller space, thereby greatly increasing the throttling ratio, completing the pressure reduction of the high-pressure oil on the high-pressure side, and improving the space utilization rate. In the process, impurities caused by assembly are not easy to be generated, the effect is stable, the oil return capacity of the compressor is improved, and thereby the stability of the compressor operation and the overall efficiency are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to an oil return throttling device and a scroll compressor. BACKGROUND

[0002] The electric scroll compressor is a device for compressing refrigerant. The principle is that the crankshaft is driven to rotate by the motor, and under the limiting of the anti-rotation mechanism, the dynamic scroll obtains power from the crankshaft and cooperates with the static scroll to move. During the process of periodically changing the volume from large to small at the scroll cooperation position, the gas refrigerant is compressed and discharged from the compressor. During this process, the high-speed operation of the moving parts generates a large amount of heat, which needs to be transferred by lubricating oil and lubricated to reduce the wear of the parts. The commonly used method is to introduce oil at high pressure to the moving parts, which not only needs reasonable design of the oil path, but also needs the key component of the oil return throttling device to reduce the pressure of the high-pressure oil.

[0003] The application CN111089059A discloses a scroll compressor oil return device, which comprises a first channel opened on the static scroll along the axial direction of the scroll compressor, a second channel opened on the upper bracket along the axial direction of the compressor, a third channel opened on the stator along the axial direction of the compressor, and at least one capillary tube. The structure of the capillary tube has the following forms: an integral cylindrical piece with a ring-shaped cross section; a cylindrical rod with a half-ring-shaped structure, the cross section of the cylindrical rod having a half circular groove; and an arc-shaped cross section formed by inwardly recessing the outer surface. Among them, the oil return capillary formed by two half-circles or the oil return capillary integrally formed with a notch in the side part needs to increase the throttling capacity of the oil return capillary when the pressure difference between the oil pool of the front shell of the compressor and the low-pressure side is high. Generally, the length of the capillary tube is increased, but the volume of the compressor is limited, and there is only one oil path in the axial direction, so the space utilization rate is low, and it cannot meet the high-pressure throttling requirements of CO2 and other high-pressure refrigerants.

[0004] The application CN105452664A discloses a threaded rod-shaped oil return mechanism, which uses a spiral oil path formed by the cooperation of the threaded rod-shaped part and the oil return channel to perform high-pressure throttling. The threaded throttling oil path utilizes the axial and circumferential space, greatly creating a throttling oil path with sufficient throttling capacity in the limited space. However, when dealing with high throttling capacity requirements, the number of threads increases, and the increase in the number of teeth will increase the probability of extruding impurities at the assembly position when the oil return device is pressed, and the accumulation of impurities in the oil path will cause the oil path to be blocked and will damage the operation of the compressor when entering the moving parts, thereby increasing the risk of failure of the compressor.

[0005] In summary, the throttling effect of the oil return throttling device is related to the length of the throttling oil path, and in the compressor of high-pressure refrigerant, especially the CO2 refrigerant compressor, how to complete the pressure reduction and throttling of high-pressure oil in the limited space is a problem that needs to be considered.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those skilled in the art. SUMMARY

[0007] In view of the problems in the prior art, the purpose of the present application is to provide an oil return throttling device and a scroll compressor, which has a meandering channel, can form an oil path reciprocating along the axial direction on the surface of the oil return throttling device in the limited space of the compressor oil path, has the advantages of simple manufacturing process, convenient installation, less impurities generated during pressing, higher reliability, etc., and can effectively improve the stability of the compressor operation and the overall efficiency.

[0008] The first aspect of the present application provides an oil return throttling device, which is a columnar structure comprising two end faces and a side face.

[0009] The side face is provided with an oil inlet channel extending to one end face, an oil outlet channel extending to the other end face, and a meandering channel communicating the oil inlet channel and the oil outlet channel.

[0010] According to the first aspect of the present application, the oil return throttling device is an integral molding.

[0011] According to the first aspect of the present application, the oil return throttling device is an assembled piece comprising a body and two end portions connected to both ends of the body.

[0012] The body is a hollow columnar structure, and each of the end portions is a T-shaped structure comprising a rod structure and a cap structure.

[0013] The rod structures of the two end portions are respectively inserted into the hollow ends of the body.

[0014] According to the first aspect of the present application, the junction of each of the end faces and one end of the side face is a first rounded corner structure.

[0015] According to the first aspect of the present application, the included angle between the oil inlet channel and the axial direction of the columnar structure is less than or equal to 20°, and / or

[0016] The included angle between the oil outlet channel and the axial direction of the columnar structure is less than or equal to 20°.

[0017] According to the first aspect of the present application, the return channel comprises a return groove and a partition ridge between the return groove, and the cross section of the return groove is quadrangular, V-shaped or semicircular.

[0018] According to the first aspect of the present application, the oil inlet channel and the oil outlet channel are parallel grooves, and the distance between the oil inlet channel and the oil outlet channel is greater than twice the width of the groove.

[0019] According to the first aspect of the present application, the return channel comprises an arc-shaped portion and a straight portion.

[0020] The oil return throttling device is an assembly comprising a body and two end portions connected to both ends of the body.

[0021] The arc-shaped portion is arranged at the two end portions; and

[0022] The straight portion is arranged at the body.

[0023] According to the first aspect of the present application, the arc-shaped portion is provided with a second chamfer structure corresponding to the partition ridge.

[0024] According to the first aspect of the present application, the oil return throttling device is made of plastic or metal material.

[0025] The second aspect of the present application provides a scroll compressor provided with an oil return channel, and at least one oil return throttling device is arranged in the oil return channel.

[0026] According to the second aspect of the present application, the scroll compressor comprises an upper cylinder cover, an upper bracket, a static scroll, a dynamic scroll and a motor, the upper cylinder cover and the static scroll form an exhaust cavity, and the motor comprises a stator.

[0027] The two ends of the oil return channel are respectively communicated with a first oil pool of the exhaust cavity and a second oil pool of the scroll compressor.

[0028] The oil return channel comprises a first channel arranged in the static scroll along the axial direction of the scroll compressor, a second channel arranged in the upper bracket along the axial direction of the scroll compressor, and a third channel arranged in the stator along the axial direction of the scroll compressor.

[0029] The oil return throttling device is arranged in the first channel, the second channel and / or the third channel.

[0030] According to the second aspect of the present application, the oil return throttling device is interference fit with the first channel, the oil return throttling device is interference fit with the second channel, and / or the oil return throttling device is interference fit with the third channel.

[0031] The oil return throttling device of the present application is provided with a return channel, when it is arranged in the oil return channel of the compressor, the axial space can be used for many times, that is, a longer throttling distance is formed in a smaller space, thereby greatly increasing the throttling ratio, completing the pressure reduction of the high-pressure oil on the high-pressure side, the space utilization rate is high, impurities caused by assembly are not easy to occur in the process, the effect is stable, and the oil return capacity of the compressor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application. Other features, objects, and advantages of the application will be apparent from a review of the detailed description of the non-limiting embodiments, with reference to the drawings. It will be apparent, from the description below, that embodiments of the application can be implemented in any number of ways, and that the embodiments should not be limited to the specific embodiments described below but can be implemented in any number of ways. It should also be understood that any feature, structure, component, and / or characteristic described in relation to one embodiment can be combined in any way with one or more features, structures, components, and / or characteristics of any other embodiment. Furthermore, the drawings are not necessarily drawn to scale. Identical reference numerals have been used, where possible, to designate corresponding parts of the application. Like reference numerals in the drawings indicate like parts, and any repetition of a reference numeral in different drawings indicates that the feature can be used in common between the embodiments.

[0033] Figure 1 Structure diagram of the oil return throttling device of the first embodiment of the present application;

[0034] Figure 2 Structure diagram of the oil return throttling device of the first embodiment of the present application;

[0035] Figure 3 And Figure 4 Structure diagram of each component of the oil return throttling device of the second embodiment of the present application;

[0036] Figure 5 Structure diagram of the scroll compressor of an embodiment of the present application; and

[0037] Figure 6 Structure diagram of the return channel and the oil return throttling device of the scroll compressor of an embodiment of the present application. DETAILED DESCRIPTION

[0038] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects to those skilled in the art. Features described in the description, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0039] In the description, expressions of "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in connection with the embodiment or example are included in at least one embodiment or example of the description. Moreover, the specific features, structures, materials or characteristics represented can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples represented in the description and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0040] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" in which other elements are placed therebetween. Relative spatial terms such as "lower", "upper" and the like can be used for the sake of easier explanation of the relationship of one device with respect to another device illustrated in the drawings. Such terms refer not only to the meaning indicated in the drawings, but also to other meanings or operations of the device in use. For example, if the device in the drawing is turned upside down, a device that was explained as "lower" with respect to another device is explained as "upper" with respect to the other device. Therefore, the exemplary term "lower" includes both upper and lower. The device can be rotated by 90° or other angles, and the relative spatial terms are also interpreted accordingly.

[0041] Although the terms first, second, etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are represented. Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", means the presence of stated features, steps, operations, elements, components, items, kinds and / or groups but does not preclude the presence or addition of one or more other features, steps, operations, elements, components, items, kinds and / or groups thereof. The terms "or" and "and / or" as used herein are to be interpreted as inclusive or meaning any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". An exception to this definition will occur only when a combination of elements, functions, steps or acts are in some way inherently mutually exclusive.

[0042] Although not defined differently, the technical terms and scientific terms used herein include those commonly used in the art to which the present description belongs, and all terms have the same meaning as generally understood by those skilled in the art to which the present description belongs. The terms defined in the commonly used dictionary are additionally explained to have a meaning consistent with the relevant technical literature and the content currently prompted, and if not defined, should not be interpreted as an ideal or very formal meaning.

[0043] In view of the problems in the prior art, the present application provides an oil return throttling device and scroll compressor. The oil return throttling device is a columnar structure, comprising two end faces and a side face. The side face is provided with an oil inlet channel extending to one end face, an oil outlet channel extending to the other end face, and a meandering channel communicating the oil inlet channel and the oil outlet channel. The oil return throttling device of the present application is provided with a meandering channel. When it is arranged in the oil return channel of the compressor, it can utilize the axial space multiple times, that is, a longer throttling distance is formed in a smaller space, thereby greatly increasing the throttling ratio, completing the pressure reduction of high-pressure oil on the high-pressure side, having high space utilization, being not easy to produce impurities caused by assembly in the process, having stable effect, improving the oil return capacity of the compressor, and thereby effectively improving the stability of the compressor operation and improving the overall efficiency.

[0044] The structure of the oil return throttling device and scroll compressor of the present application will be further described below in combination with the drawings and specific embodiments. It should be understood that each specific embodiment is not a limitation on the protection scope of the present application.

[0045] Figure 1 The structure of the oil return throttling device of the first embodiment of the present application is shown in the figure. Specifically, the oil return throttling device 8 is a columnar structure, comprising two end faces and a side face. The side face is provided with an oil inlet channel 81 extending to one end face, an oil outlet channel 82 extending to the other end face, and a meandering channel 83 communicating the oil inlet channel 81 and the oil outlet channel 82.

[0046] In the first embodiment, the oil inlet channel 81 and the oil outlet channel 82 are both straight grooves, and they can be parallel to each other. The oil inlet channel 81 and the oil outlet channel 82 can also be other shapes, such as corrugated, zigzag, etc. The meandering channel 83 comprises a meandering groove and a partition ridge between the grooves, Figure 2As shown in FIG. 8, the cross section of the meandering groove 831 can be semicircular, and the cross section of the meandering groove 831 can be quadrangular, V-shaped or other shapes. The grooves or recesses herein are relative to the side surface of the columnar structure, and the different names are only to distinguish the inlet oil passage 81 and the outlet oil passage 82 from the meandering passage 83. The cross section of the groove of the inlet oil passage 81 and the recess of the outlet oil passage 82 can also be quadrangular, V-shaped or semicircular, which is not limited herein.

[0047] As shown in FIG. 8, the cross section of the meandering groove 831 can be semicircular, and the cross section of the meandering groove 831 can be quadrangular, V-shaped or other shapes. The grooves or recesses herein are relative to the side surface of the columnar structure, and the different names are only to distinguish the inlet oil passage 81 and the outlet oil passage 82 from the meandering passage 83. The cross section of the groove of the inlet oil passage 81 and the recess of the outlet oil passage 82 can also be quadrangular, V-shaped or semicircular, which is not limited herein. Figure 1 As shown in FIG. 8, the cross section of the meandering groove 831 can be semicircular, and the cross section of the meandering groove 831 can be quadrangular, V-shaped or other shapes. The grooves or recesses herein are relative to the side surface of the columnar structure, and the different names are only to distinguish the inlet oil passage 81 and the outlet oil passage 82 from the meandering passage 83. The cross section of the groove of the inlet oil passage 81 and the recess of the outlet oil passage 82 can also be quadrangular, V-shaped or semicircular, which is not limited herein. Figure 1 As shown in FIG. 8, the cross section of the meandering groove 831 can be semicircular, and the cross section of the meandering groove 831 can be quadrangular, V-shaped or other shapes. The grooves or recesses herein are relative to the side surface of the columnar structure, and the different names are only to distinguish the inlet oil passage 81 and the outlet oil passage 82 from the meandering passage 83. The cross section of the groove of the inlet oil passage 81 and the recess of the outlet oil passage 82 can also be quadrangular, V-shaped or semicircular, which is not limited herein. Figure 1 As shown in FIG. 8, the cross section of the meandering groove 831 can be semicircular, and the cross section of the meandering groove 831 can be quadrangular, V-shaped or other shapes. The grooves or recesses herein are relative to the side surface of the columnar structure, and the different names are only to distinguish the inlet oil passage 81 and the outlet oil passage 82 from the meandering passage 83. The cross section of the groove of the inlet oil passage 81 and the recess of the outlet oil passage 82 can also be quadrangular, V-shaped or semicircular, which is not limited herein.

[0048] As shown in FIG. 8, the cross section of the meandering groove 831 can be semicircular, and the cross section of the meandering groove 831 can be quadrangular, V-shaped or other shapes. The grooves or recesses herein are relative to the side surface of the columnar structure, and the different names are only to distinguish the inlet oil passage 81 and the outlet oil passage 82 from the meandering passage 83. The cross section of the groove of the inlet oil passage 81 and the recess of the outlet oil passage 82 can also be quadrangular, V-shaped or semicircular, which is not limited herein.

[0049] In some embodiments, the straight portion of the meandering passage 83 can also be linear, corrugated or zigzag, and can be parallel to the oil inlet passage 81 / oil outlet passage 82 as shown in the first embodiment, or can be non-parallel. The meandering passage 83 can comprise a plurality of meandering structures which can be identical, i.e. a plurality of identical meandering structures arranged periodically to form the meandering passage 83, or can be different, in which case the density and height of the grooves of the straight portions can be different.

[0050] The oil return throttling device 8 of the first embodiment is a one-piece component, and in some embodiments, the junction between each of the end faces and one end of the side face of the oil return throttling device 8 is a first chamfer structure 84. The first chamfer structure not only facilitates the press-fitting of the oil return throttling device in the oil return passage, reducing impurities during installation, but also increases the contact area between the high-pressure oil and the throttling passage.

[0051] The one-piece oil return throttling device 8 is relatively low in cost, but the precision of the fitting dimensions can be slightly poor during the press-fitting process of the oil return passage of the compressor. In some embodiments, the oil return throttling device can also be an assembly formed by assembling a plurality of components processed separately, Figure 3 and Figure 4 The second embodiment of the oil return throttling device is shown in the structure diagram of each component of the oil return throttling device, which comprises a body 8B and two end portions 8A connected to both ends of the body 8B. The body 8B is a hollow cylindrical structure, and each of the end portions 8A is a T-shaped structure comprising a cap structure 8A1 and a rod structure 8A2. In the second embodiment, the curved portion 83A of the meandering passage can be arranged at the end portion 8A, more specifically, at the side wall of the cap structure 8A1, and the cap structure 8A1 is further provided with an oil inlet passage 81A. The straight portion of the meandering passage is arranged at the body 8B, more specifically, at the side wall of the body 8B.

[0052] The rod structure 8A2 of the two end portions 8A is respectively inserted into the two ends of the hollow 8B1 of the body 8B. When the two end portions 8A are assembled with the body 8B, the groove of the oil inlet channel 81A is aligned with the groove 831B of the straight portion, and in some embodiments, the second rounded corner structure 8321B of the partition ridge 832B corresponding to the arc-shaped portion 83A is provided, which can be used as a positioning when the end portion 8A is assembled with the body 8B, and at the same time, the second rounded corner structure 8321B of the partition ridge 832B corresponding to the arc-shaped portion 83A can avoid poor flow of lubricating oil in the arc-shaped portion 83A. The rod structure 8A2 and the hollow 8B1 of the body can be assembled in an interference fit manner. The assembly can be processed to control the assembly size and improve the precision of the oil return throttling device 8. Similarly, in order to facilitate the press fitting of the oil return throttling device in the oil return channel and reduce impurities generated during installation, the end face of the cap structure 8A1 is provided with a first rounded corner structure 84A.

[0053] The oil return throttling device of the present application can be made of plastic or metal material, and the processing technology of plastic or metal material is mature. The oil return throttling device can be an integrally formed piece or an assembled piece according to the actual use scene.

[0054] The present application also provides a scroll compressor provided with an oil return channel, and at least one oil return throttling device is arranged in the oil return channel. Figure 5 The structure diagram of the scroll compressor of an embodiment of the present application; the scroll compressor includes an upper cylinder cover 1, an upper support 2, a static scroll 3, a dynamic scroll 4, and a motor including a stator 5. The upper cylinder cover 1 and the static scroll 3 form an exhaust cavity. A first oil pool 61 is arranged in the exhaust cavity. The static scroll 3 and the dynamic scroll 44 cooperate to form a low-pressure cavity, a medium-pressure cavity, and a high-pressure cavity, and the medium-pressure cavity is located between the low-pressure cavity and the high-pressure cavity. The static scroll 3 and the upper support 2 form an air suction cavity, wherein the low-pressure cavity communicates with the air suction cavity when the scroll compressor sucks air, and the high-pressure cavity communicates with the exhaust cavity when the scroll compressor exhausts air. The two ends of the oil return channel respectively communicate with the first oil pool 61 of the exhaust cavity and the second oil pool 62 of the scroll compressor;

[0055] The oil return channel includes a first channel 9A arranged on the static scroll 1 in the axial direction of the scroll compressor, a second channel 9B arranged on the upper support 2 in the axial direction of the scroll compressor, and a third channel 9C arranged on the stator 5 in the axial direction of the scroll compressor; the first channel 9A, the second channel 9B, and the third channel 9C are communicated to form the oil return channel. The oil return channel communicates the first oil pool 61 in the exhaust cavity with the second oil pool 62 of the scroll compressor, and the second oil pool 62 is usually located at the bottom of the scroll compressor. That is, the lubricating oil in the exhaust cavity is guided back to the second oil pool 62 at the bottom of the scroll compressor through the oil return channel. The position of the second oil pool 62 in the scroll compressor is not limited in the present application.

[0056] The oil return throttle device 8 can be arranged in the first channel 91, the second channel 92 or the third channel 93. In some embodiments, the oil return channel can be arranged with multiple oil return throttle devices 8 according to the structure of the compressor, that is, the oil return throttle device 8 can be arranged in each of the first channel 91, the second channel 92 or the third channel 93.

[0057] Figure 6 The structure diagram of the return flow channel and the oil return throttle device of the scroll compressor of an embodiment of the present application. Among them, the first channel 9A, the second channel 9B or the third channel 9C are all marked as the channel 9, and the oil return throttle device 8 is in interference fit with the inner wall 91 of the channel 9. The oil inlet channel 81, the return channel 83 and the oil outlet channel 82 of the oil return throttle device 8 and the inner wall of the return flow channel form a throttling oil path. The return flow channel is along the axial direction of the scroll compressor, and is consistent with the pressing direction of the oil return throttle device 8, so that impurities caused by the extrusion of the circumferential corner during the pressing process are not easy to be generated, the smoothness of the oil path is ensured, and the negative impact on the internal environment of the compressor is avoided. At the same time, since the return channel 83 is an oil path reciprocating along the axial direction, the axial space can be utilized multiple times during throttling, which can greatly increase the throttling ratio and improve the throttling efficiency.

[0058] When the compressor of the present application operates, the lubricating oil in the compressor moves from the suction side to the discharge side along with the refrigerant, the high-pressure oil at the discharge side is introduced into the oil return throttle device through the oil return channel, and the high-pressure oil continues to move along the capillary oil path generated by the cooperation of the oil return throttle device and the channel, and the pressure is reduced under the action of the long enough throttling oil path, and then the low-pressure oil is transferred to the moving parts needing lubrication along the oil return channel, and the moving parts are lubricated. The low-pressure oil enters the compression chamber again along with the refrigerant, and the next cycle begins. The above process can avoid the lubricating oil entering the air conditioning system pipeline along with the compressed gas, which affects the refrigeration and heating efficiency of the air conditioner, and in severe cases, it will affect the normal operation of the compressor; and can avoid the problem of large consumption of oil in the low-pressure cavity, which causes the lubrication of the compressor to be short of oil, and is beneficial to improve the working reliability of the compressor.

[0059] In summary, the scroll compressor of the present application realizes oil return management through the axial oil return channel and the multiple oil return throttle devices in the oil return channel, without the need to additionally add other oil return pipes, which reduces the production cost, and also avoids the noise problem caused by the contact between the oil return pipe and the compressor shell.

[0060] The foregoing is considered as further explanation of the application in connection with the preferred embodiments, and cannot be deemed as limitation of the specific implementation of the application to these descriptions. It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be deemed as limiting the claims to which they relate.

Claims

1. An oil return restriction device characterized by comprising: The oil return throttle device is a columnar structure comprising two end faces and a side face; The side face is provided with an oil inlet channel extending to one end face, an oil outlet channel extending to the other end face, and a meandering channel connecting the oil inlet channel and the oil outlet channel; The meandering channel comprises an arc-shaped portion and a straight portion; The oil return throttle device is an assembly comprising a body and two end portions connected to two ends of the body; The body is a hollow columnar structure, and each of the end portions is a T-shaped structure comprising a stem structure and a cap structure; The stems of the two end portions are respectively inserted into the hollow ends of the body; The arc-shaped portion is arranged at the two end portions; and The straight portion is arranged at the body; The meandering channel comprises a meandering groove and a partition ridge between the groove; The arc-shaped portion is provided with a second rounded corner structure corresponding to the partition ridge.

2. The oil return restriction device according to claim 1, characterized by The junction of each of the end faces and one end of the side face is a first rounded corner structure.

3. The oil return restriction device according to claim 1, characterized by The included angle between the oil inlet channel and the axial direction of the columnar structure is less than or equal to 20°, and / or The included angle between the oil outlet channel and the axial direction of the columnar structure is less than or equal to 20°.

4. The oil return restriction device according to claim 1, characterized by The cross section of the meandering groove is quadrangular, V-shaped or semicircular.

5. The oil return restriction device according to claim 1, characterized by The oil inlet channel and the oil outlet channel are mutually parallel grooves, and the distance between the oil inlet channel and the oil outlet channel is greater than twice the width of the groove.

6. The oil return restriction device according to claim 1, characterized by The oil return throttle device is made of plastic or metal material.

7. A scroll compressor characterized by The scroll compressor is provided with an oil return channel, and at least one oil return throttle device according to any one of claims 1 to 6 is arranged in the oil return channel.

8. The scroll compressor of claim 7, wherein, The scroll compressor comprises an upper cylinder cover, an upper bracket, a static scroll, a dynamic scroll and a motor, the upper cylinder cover and the static scroll form an exhaust cavity, and the motor comprises a stator; Two ends of the oil return channel are respectively connected to a first oil pool of the exhaust cavity and a second oil pool of the scroll compressor; The oil return channel comprises a first channel arranged on the static scroll along the axial direction of the scroll compressor, a second channel arranged on the upper bracket along the axial direction of the scroll compressor, and a third channel arranged on the stator along the axial direction of the scroll compressor; The oil return throttle device is arranged in the first channel, the second channel and / or the third channel.

9. The scroll compressor of claim 8, wherein, The oil return throttle device is in interference fit with the first channel, the oil return throttle device is in interference fit with the second channel, and / or the oil return throttle device is in interference fit with the third channel.

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