Compressor and lubricating oil filtering device thereof, crankshaft structure and pump body assembly

Abstract

The invention provides a compressor and a lubricating oil filtering device thereof, a crankshaft structure and a pump body assembly, and the lubricating oil filtering device comprises a centrifugal separation part and a first filtering part; the centrifugal separation piece is cylindrical, a flow inlet is formed in one end of the centrifugal separation piece, and a flow outlet is formed in the other end of the centrifugal separation piece; the centrifugal separation piece is used for being fixedly arranged in an oil through hole in a crankshaft of the compressor in a sleeved mode and is in sealing fit with the hole wall of the oil through hole so that lubricating oil in the oil through hole can flow through the centrifugal separation piece through the flow inlet and the flow outlet. A concave impurity interception groove is formed in the inner wall of the centrifugal separation part; the first filtering piece is arranged on the downstream side of the impurity interception groove in the flowing direction of lubricating oil in the centrifugal separation piece; and the first filtering piece is used for filtering the lubricating oil flowing out of the flow outlet. Impurities in the compressor lubricating oil can be reduced, and the performance and the service life of the compressor are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of compressors, and particularly relates to a compressor and a lubricating oil filtering device, a crankshaft structure and a pump body assembly thereof. BACKGROUND

[0002] During the operation of a piston compressor, lubricating oil can mix with various impurities such as metal swarf and dust. After the impurities are stirred up, they can be sucked into the oil pump. The impurities in the lubricating oil can enter the friction pairs of the moving parts of the compressor during the operation of the oil pump. When the moving parts move, the impurities accelerate the friction of the friction pairs and accelerate the wear of the moving parts, thereby reducing the maximum working pressure of the compressor and the service life of the compressor. Sometimes, the impurities can be stuck between the relatively moving parts, causing the compressor to be stuck and unable to work, and further causing related other devices to be unable to work normally. Therefore, how to reduce the impurities in the lubricating oil of the compressor has become a technical problem to be solved by those skilled in the art. SUMMARY

[0003] Therefore, the present application provides a compressor and a lubricating oil filtering device, a crankshaft structure and a pump body assembly thereof, and mainly aims to solve the technical problem of how to reduce the impurities in the lubricating oil of the compressor.

[0004] In order to solve the above problems, the present application provides a lubricating oil filtering device of a compressor, which comprises a centrifugal separation piece and a first filtering piece. The centrifugal separation piece is in a cylindrical shape to form an inlet at one end and an outlet at the other end. The centrifugal separation piece is used to be sleeved in an oil passage hole inside the crankshaft of the compressor and sealingly matched with the hole wall of the oil passage hole, so that the lubricating oil in the oil passage hole can flow through the centrifugal separation piece through the inlet and the outlet. An inner recessed impurity trapping groove is arranged on the inner wall of the centrifugal separation piece. Among them, along the flow direction of the lubricating oil in the centrifugal separation piece, the first filtering piece is arranged on the downstream side of the impurity trapping groove; and the first filtering piece is used to filter the lubricating oil flowing out of the outlet.

[0005] In some embodiments, the impurity trapping groove is a spiral groove, and the rotation direction of the spiral groove is consistent with the rotation direction of the crankshaft.

[0006] In some embodiments, the included angle between the groove wall of the impurity trapping groove away from the inlet and the inner wall surface of the centrifugal separation piece is a, wherein a is less than or equal to 90 degrees.

[0007] In some embodiments, the number of the impurity interception grooves is two or more, and the grooves are arranged in sequence along the center line direction of the centrifugal separation member.

[0008] In some embodiments, the inner hole of the centrifugal separation member has a flow inlet section, a frustoconical hole section and a flow outlet section connected in sequence, the end of the flow inlet section away from the frustoconical hole section serves as the flow inlet, and the end of the flow outlet section away from the frustoconical hole section serves as the flow outlet; the frustoconical hole section is connected to the flow outlet section through a small opening end and to the flow inlet section through a large opening end; the impurity interception grooves are arranged on the hole wall of the frustoconical hole section.

[0009] The application further provides a crankshaft structure comprising the lubricating oil filtering device of the compressor.

[0010] The application further provides a pump body assembly comprising the lubricating oil filtering device of the compressor or the crankshaft structure.

[0011] In some embodiments, the pump body assembly further comprises a pump oil member, the pump oil member is a fixed member, the pump oil member extends into the oil inlet of the oil passage hole, and a pump oil gap is formed between the pump oil member and the inner wall of the oil inlet. In some embodiments, the pump oil member is located on the upstream side of the centrifugal separation member along the flow direction of the lubricating oil in the oil passage hole; the pump oil member has opposite first and second ends, the first end is opposite to the centrifugal separation member, the first end is provided with an oil return hole opposite to the flow inlet, the oil return hole penetrates to the second end; the pump body assembly further comprises a second filter member for filtering the lubricating oil flowing out of the oil return hole.

[0012] The application further provides a compressor comprising the lubricating oil filtering device of the compressor or the crankshaft structure or the pump body assembly.

[0013] The compressor and the lubricating oil filtering device, the crankshaft structure and the pump body assembly provided by the application have the following beneficial effects: 1、The impurity interception groove in the centrifugal separation piece and the first filter piece can form a two-stage filtering structure. On the one hand, the centrifugal separation piece can rotate together with the crankshaft due to being sleeved in the crankshaft, and the lubricating oil in the oil passage is filtered by the centrifugal force when flowing through the centrifugal separation piece, and the impurities with large density are thrown to the inner wall surface of the centrifugal separation piece and are adsorbed in the impurity interception groove, forming a first-stage filtering; then the lubricating oil continues to flow and is secondarily filtered by the first filter piece when flowing out of the outflow port, the first filter piece can filter the fine impurities remaining after centrifugal separation, and the cleanliness of the finally output lubricating oil is ensured, so that the impurities in the compressor lubricating oil can be effectively reduced, and the performance and service life of the compressor are improved.

[0014] 2、The oil return hole is formed in the inner cavity of the pump oil piece, the second filter piece at the bottom of the oil return hole and the through hole section collect impurities, reduce the problem that the impurities re-enter the oil pool and gradually increase, improve the filtering efficiency and quality, reduce the content of impurities in the lubricating system, and ensure the reliability of the compressor operation. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. The drawings in the following description are only exemplary, and for those skilled in the art, other embodiments can be derived from the provided drawings without paying creative labor.

[0016] Figure 1 is an exploded view of a lubricating oil filtering device, a crankshaft and a pump oil piece provided by an embodiment of the present application; Figure 2 is an assembly schematic view of the structure in Figure 1 Figure 3 is a sectional view of A-A in Figure 2 Figure 4 is an enlarged schematic view of A in Figure 3 Figure 5 is a schematic view reflecting the included angle between the groove wall on the side away from the inflow port of the impurity interception groove and the inner wall surface of the centrifugal separation piece.

[0017] The reference signs are: ​​​1, crankshaft; 2, lubricating oil filtering device; 3, pumping part; 4, limiting steel wire; 5, oil return hole; 6, second filtering part; 11, oil passage hole; 21, first filtering part; 22, centrifugal separation part; 23, impurity interception groove; 24, inflow port; 25, outflow port; 26, pumping gap; 27, inner hole of centrifugal separation part; 31, helical groove; 51, oil return groove section; 52, through hole section; 52, oil return passage; 231, groove wall of impurity interception groove on the side away from the inflow port; 270, inner wall surface of centrifugal separation part; 271, outflow port section; 272, frustoconical hole section; 273, inflow port section. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work belong to the scope of protection of the present application.

[0019] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0020] For the convenience of description, spatial relative terms such as "above", "upper", "on", "top", and the like can be used herein to describe one device or feature's spatial position relationship with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0021] In addition, it should be noted that the use of the terms "first", "second", etc. to define components is merely for the convenience of distinguishing the corresponding components, and the above terms have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0022] With reference to the accompanying drawings Figures 1-5 As shown, according to an embodiment of the present application, a lubricating oil filtering device 2 of a compressor is provided, which comprises a centrifugal separation piece 22 and a first filtering piece 21. The centrifugal separation piece 22 is in a cylindrical shape to form an inlet port 24 at one end and an outlet port 25 at the other end. The centrifugal separation piece 22 is used to be fitted in an oil passage 11 inside a crankshaft 1 of the compressor, and sealingly cooperates with the hole wall of the oil passage 11, so that the lubricating oil in the oil passage 11 can flow through the centrifugal separation piece 22 through the inlet port 24 and the outlet port 25. An inner wall of the centrifugal separation piece 22 is provided with an inner recessed impurity trapping groove 23. The first filtering piece 21 described above is arranged on the downstream side of the impurity trapping groove 23 along the flow direction of the lubricating oil in the centrifugal separation piece 22. The first filtering piece 21 is used to filter the lubricating oil flowing out of the outlet port 25.

[0023] In the above example, the impurity trapping groove 23 in the centrifugal separation piece 22 and the first filtering piece 21 form a two-stage filtering structure. On the one hand, the centrifugal separation piece 22 is fitted inside the crankshaft 1, so that the centrifugal separation piece 22 can rotate together with the crankshaft 1. When the lubricating oil in the oil passage 11 flows through the centrifugal separation piece 22, the impurities with higher density are thrown to the inner wall surface of the centrifugal separation piece 22 under the action of centrifugal force, and are adsorbed in the impurity trapping groove 23, forming a first-stage filtration. Then the lubricating oil continues to flow, and is subjected to a second filtration by the first filtering piece 21 when flowing out of the outlet port 25. The first filtering piece 21 can filter the fine impurities remaining after centrifugal separation, ensuring the cleanliness of the finally output lubricating oil, so as to effectively reduce the impurities in the lubricating oil of the compressor and improve the performance and service life of the compressor.

[0024] In some embodiments, the aforementioned first filtering piece 21 can comprise a first filter screen to filter the lubricating oil flowing out of the outlet port 25. The first filtering piece 21 further comprises a first seat body, and the first filter screen is installed on the first seat body. The first seat body can be annular, and the first filter screen is fixed at the center hole of the first seat body.

[0025] The aforementioned outlet port 25 can be provided with a mounting groove, and the first filtering piece 21 can be embedded in the mounting groove through the seat body.

[0026] In some embodiments, the centrifugal separation member 22 can be in interference fit with the hole wall of the oil passage hole 11 to achieve the function of the centrifugal separation member 22 being fitted in the oil passage hole 11. In this case, the end face of the inflow port end and the end face of the outflow port end of the centrifugal separation member 22 are perpendicular to the center line of the centrifugal separation member 22. The outer wall of the centrifugal separation member 22 is parallel to the hole wall of the oil passage hole 11, so that the two can be closely fitted to achieve a sealing fit therebetween and facilitate the interference fit of the centrifugal separation member 22 in the oil passage hole 11.

[0027] In some embodiments, as shown in Figure 4 , the impurity trapping groove 23 can be a spiral groove, and the rotation direction of the spiral groove is consistent with the rotation direction of the crankshaft 1.

[0028] In the above example, the lubricating oil rotates upward along the inner wall in the centrifugal separation member 22, and the impurities with high density are quickly separated from the lubricating oil under the action of the centrifugal force. By designing the rotation direction of the spiral groove to be consistent with the rotation direction of the crankshaft 1, the residence time of the lubricating oil in the centrifugal separation member 22 can be prolonged, and the opportunity for impurity separation can be increased.

[0029] In some embodiments, as shown in Figure 5 , the included angle between the groove wall 231 on the side of the impurity trapping groove away from the inflow port and the inner wall surface 270 of the centrifugal separation member is a, wherein a is less than or equal to 90 degrees. In this way, the groove wall 231 on the side of the impurity trapping groove away from the inflow port can be prevented from forming a flared shape to guide the impurities, thereby preventing the impurities from continuing to flow upward with the lubricating oil and improving the effect of trapping the impurities in the impurity trapping groove 23.

[0030] In some embodiments, as shown in Figure 4 , the number of the impurity trapping grooves 23 can be two or more, and the impurity trapping grooves 23 are arranged in sequence along the center line direction of the centrifugal separation member 22. By providing a larger number of impurity trapping grooves 23, the effect of trapping the impurities in the impurity trapping grooves 23 can be improved.

[0031] In some embodiments, as shown in Figure 4 , the inner hole 27 of the centrifugal separation member has an inflow port section 273, a frustoconical hole section 272, and an outflow port section 271 connected in sequence. The end of the inflow port section 273 away from the frustoconical hole section 272 serves as the aforementioned inflow port 24, and the end of the outflow port section 271 away from the frustoconical hole section 272 serves as the aforementioned outflow port 25. The frustoconical hole section 272 is connected to the outflow port section 271 through a small opening end and connected to the inflow port section 273 through a large opening end. The impurity trapping groove 23 is provided on the hole wall of the frustoconical hole section 272.

[0032] In the above example, the taper hole section 272 is set so that the gradually decreasing inner diameter structure accelerates the flow of lubricating oil when flowing from the large end to the small end, realizes efficient delivery of lubricating oil, and improves the flow rate of lubricating oil. The higher the flow rate of lubricating oil, the stronger the centrifugal effect, and the more conducive to the trapping effect of the impurity trapping groove 23 on impurities.

[0033] As shown in Figure 4 the aforementioned outflow port section 271 and the inflow port section 273 are both straight hole sections, and the hole diameter of the outflow port section 271 is smaller than that of the inflow port section 273. The shape of the hole wall in the lubricating oil hole 11 where the centrifugal separation piece 22 is installed is consistent with the shape of the centrifugal separation piece 22, which is conducive to the flow and transportation of lubricating oil.

[0034] In some embodiments, the present application also provides a crankshaft structure, which can include the lubricating oil filtering device 2 of any one of the above compressors.

[0035] In some embodiments, the present application also provides a pump body assembly, which includes the lubricating oil filtering device 2 of any one of the above compressors; or includes the crankshaft structure described above.

[0036] In some embodiments, as shown in Figure 3 the aforementioned pump body assembly can further include a pump oil piece 3, which is a fixed piece. The pump oil piece 3 extends into the oil inlet of the lubricating oil hole 11 and forms a pump oil gap 26 with the inner wall of the oil inlet. Among them, along the flow direction of the lubricating oil in the lubricating oil hole 11, the pump oil piece 3 is located on the upstream side of the centrifugal separation piece 22. The pump oil piece 3 has opposite first and second ends, the first end is opposite to the centrifugal separation piece 22, and the first end is provided with an oil return hole 5 opposite to the inflow port 24 on the centrifugal separation piece 22. The oil return hole 5 penetrates to the second end. The pump body assembly further includes a second filter piece 6 for filtering lubricating oil flowing out of the oil return hole 5.

[0037] In the above example, since the oil return hole 5 on the pump oil piece 3 is opposite to the inflow port 24 on the centrifugal separation piece 22, after the compressor stops, the impurities in the impurity trapping groove 23 can fall into the oil return hole 5 from the inflow port 24 of the centrifugal separation piece 22 under the action of gravity, and after being filtered by the second filter piece 6, the impurities will be accumulated and stored in the oil return hole 5, and the clean lubricating oil will return to the oil pool of the compressor through the oil return hole 5, and re-enter the lubricating system.

[0038] It should be noted that a small amount of impurities in the impurity retention tank 23 may flow back to the oil pool of the compressor through the pump oil gap 26 along with the residual lubricating oil. First, the impurities are small relative to the pump oil gap and will not block the pump oil gap 26. In addition, the impurities that fall into the oil pool will be sucked into the oil passage 11 of the crankshaft 1 during the next start of the compressor and will still be filtered and collected by the lubricating oil filtering device 2. The impurities will only become less and less, but will not enter the lubrication of the friction pairs of the compressor and will not affect the operating efficiency and reliability of the compressor.

[0039] In some embodiments, as shown in Figure 3 The aforementioned oil return hole 5 has an oil return groove section 51 and a through-hole section 52 arranged at the bottom of the oil return groove section 51, wherein the oil return groove section 51 is arranged at the aforementioned first end, and the through-hole section 52 penetrates from the bottom surface of the oil return groove section 51 to the aforementioned second end. The oil return hole 5 is opposite to the aforementioned inlet 24 through the opening of the oil return groove section 51. The aforementioned second filter 6 can be embedded at the bottom of the oil return groove section 51.

[0040] In some embodiments, the aforementioned second filter 6 can include a second filter screen to filter the lubricating oil flowing out of the oil return hole. The second filter 6 further includes a second seat body, and the second filter screen is installed on the second seat body. The second seat body can be annular, and the second filter screen is fixed at the center hole of the second seat body. The aforementioned second filter 6 can be embedded at the bottom of the oil return hole 5 through the second seat body.

[0041] As shown in Figure 1 The outer wall of the aforementioned pump oil piece 3 can be provided with a spiral groove 31, so that the pump oil piece 3 is a spiral oil pump. The pump oil piece 3 cooperates with the second filter 6 through the oil return hole 5, so that the pump oil piece 3 has the function of collecting impurities. Therefore, in some cases, the oil return hole 5 in the pump oil piece 3 can also be called a collection bucket. Since the pump oil piece 3 is an inherent part of the compressor, the oil return hole 5 is arranged on the pump oil piece 3 without occupying additional space in the compressor, which is simple in structure and reduces the cost.

[0042] In some embodiments, the aforementioned first filter 21 and second filter 6 can be installed in a detachable manner, and the parts are clamped through grooves. When installed, the embedded parts are completed by overcoming the friction or elastic deformation. The materials of the filter screens on the first filter 21 and the second filter 6 are generally selected from corrosion-resistant and high-strength materials such as stainless steel or polyester fiber. The pore size of the filter screen is determined according to the size of the impurities to be filtered, and is generally 20-100 μm.

[0043] In some embodiments, the present application further provides a compressor, which includes the lubricating oil filtering device 2 of any one of the above-mentioned compressors; or includes the crankshaft structure of the above-mentioned; or includes the pump body assembly of the above-mentioned.

[0044] In some embodiments, the compressor further comprises a motor stator, and the oil pumping element 3 is clamped on the motor stator by the limiting steel wire 4.

[0045] In some embodiments, the compressor can be a piston compressor.

[0046] For the convenience of understanding, the overall structure of the present application is described below, and the working principle thereof is described.

[0047] During the operation of the piston compressor, impurities such as metal swarf and dust may be mixed into the lubricating oil. After the impurities are stirred up slowly, they may be sucked by the oil pump and transported upward to the friction pairs of the moving parts, which may easily cause the increase of friction resistance, the increase of wear, and even the jamming, thereby affecting the performance and service life of the compressor. The traditional filter screen type filter is easy to be blocked, and the impurities cannot be collected and may re-enter the lubricating oil pool. The single centrifugal separation device has poor separation effect on small particles. The lubricating oil filter device 2 of the present application can improve the impurity filtration efficiency in the lubricating oil, effectively remove the impurities in the lubricating oil, and reduce the maintenance cost.

[0048] The working principle of the lubricating oil filter device 2 of the present application is as follows: when the lubricating oil flows into the centrifugal separation element 22 from the inlet 24, the rotation direction of the lubricating oil is the same as the rotation direction of the crankshaft 1 under the action of centrifugal force, and a high-speed rotating rotational flow is formed. Under the action of centrifugal force, the impurities with higher density are thrown to the inner wall surface of the centrifugal separation element 22 and are adsorbed in the impurity trapping groove 23. The impurity trapping groove 23 is a spiral groove, and the spiral direction of the spiral groove is consistent with the rotation direction of the crankshaft 1. After the impurities enter the impurity trapping groove 23, the groove wall of the impurity trapping groove 23 is perpendicular to the inner wall surface of the centrifugal separation element 22, which prevents the impurities from continuing to flow upward with the lubricating oil, prolongs the residence time of the lubricating oil in the centrifugal separation element 22, and increases the opportunity for impurity separation. The first filter screen element is arranged at the top of the centrifugal separation element 22 and is used for filtering small impurities remaining after centrifugal separation, so as to ensure the cleanliness of the finally output lubricating oil.

[0049] When the compressor is running, the oil pumping gap 26 formed between the oil hole 11 of the crankshaft 1 and the oil pumping part 3 absorbs lubricating oil from the bottom oil pool and transports it upward along the oil hole 11 to the inlet 24 of the centrifugal separation part 22, and the lubricating oil enters the centrifugal separation part 22, rotates rapidly along the inner wall of the centrifugal separation part 22, and the impurities with high density are separated from the lubricating oil under the action of centrifugal force and are adsorbed by the impurity trapping groove 23, realizing the first filtration. Then, the lubricating oil is filtered through the first filter 21 at the top of the centrifugal separation part 22, and the first filter 21 filters the fine impurities remaining after centrifugal separation, realizing the second filtration. The clean lubricating oil after the two filtrations flows out from the outlet 25 and enters the oil supply system of the crankshaft 1. After the compressor stops, under the action of gravity, the impurities slide along the wall of the oil hole 11 with the residual lubricating oil into the oil return hole 5 on the oil pumping part 3, and after being filtered by the second filter 6, the impurities are collected in the oil return hole 5, and the clean lubricating oil returns to the oil pool through the through hole section 52 at the bottom of the oil return hole 5 and reenters the lubricating system.

[0050] The present application forms a two-stage filtration structure by the first filter 21 and the centrifugal separation part 22, which can effectively filter impurities in the lubricating oil and improve the performance and service life of the compressor. The oil return hole 5 is formed in the inner cavity of the oil pumping part 3, and the second filter 6 and the through hole section 52 at the bottom of the oil return hole 5 collect impurities, reducing the problem of impurities re-entering the oil pool and gradually increasing the difficulty of filtration, improving filtration efficiency and quality, reducing the content of impurities in the lubricating system, and ensuring the reliability of the compressor operation.

[0051] The present application solves the problem that the impurities in the existing lubricating oil increase the frictional resistance between the moving components, increase the wear, and even cause the components to be stuck, and also solves the problem that the traditional filter device has poor filtering effect and cannot collect impurities.

[0052] It is easy for those skilled in the art to understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0053] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above description is only the preferred embodiment of the present application, and it should be pointed out that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present application, and these improvements and modifications shall be regarded as the protection scope of the present application.

Claims

1. A lubricating oil filtering device for a compressor, characterized by: The centrifugal separation member (22) and the first filter member (21) are included. The centrifugal separation member (22) is in a cylindrical shape to form an inlet (24) at one end and an outlet (25) at the other end. The centrifugal separation member (22) is arranged in the oil passage (11) inside the crankshaft (1) of the compressor and is in sealing contact with the wall of the oil passage (11) to allow the lubricating oil in the oil passage (11) to flow through the centrifugal separation member (22) through the inlet (24) and the outlet (25). The inner wall of the centrifugal separation member (22) is provided with an inner recessed impurity trapping groove (23). The first filter member (21) is arranged on the downstream side of the impurity trapping groove (23) along the flow direction of the lubricating oil in the centrifugal separation member (22), and is used to filter the lubricating oil flowing out of the outlet (25).

2. The lubricating oil filtering device of the compressor according to claim 1, wherein: The impurity trapping groove (23) is a spiral groove, and the rotation direction of the spiral groove is consistent with the rotation direction of the crankshaft (1).

3. The lubricating oil filtering device of the compressor according to claim 1, wherein: The included angle between the groove wall (231) on the side away from the inlet of the impurity trapping groove and the inner wall surface (270) of the centrifugal separation member is a, wherein a is less than or equal to 90 degrees.

4. The lubricating oil filtering device (2) of the compressor according to any one of claims 1-3, wherein: The number of the impurity trapping grooves (23) is more than two, and they are arranged in sequence and at intervals along the center line direction of the centrifugal separation member (22).

5. The lubricating oil filtering device (2) of the compressor according to any one of claims 1-3, wherein: The inner hole (27) of the centrifugal separation member has an inlet section (273), a frustoconical hole section (272), and an outlet section (271) connected in sequence, the end of the inlet section (273) away from the frustoconical hole section (272) serves as the inlet (24), and the end of the outlet section (271) away from the frustoconical hole section (272) serves as the outlet (25); the frustoconical hole section (272) is connected to the outlet section (271) through a small end and to the inlet section (273) through a large end; and the impurity trapping groove (23) is arranged on the hole wall of the frustoconical hole section (272).

6. A crankshaft structure characterized by comprising: The lubricating oil filtering device (2) of the compressor according to any one of claims 1-5 is included.

7. A pump body assembly characterized by: The lubricating oil filtering device (2) of the compressor according to any one of claims 1-5 is included, or the crankshaft structure according to claim 6 is included.

8. The pump body assembly of claim 7, wherein: A pump member (3) is further included, the pump member (3) is a fixed member, the pump member (3) extends into the oil inlet of the oil passage (11) and forms a pump gap (26) with the inner wall of the oil inlet. The pump oil part (3) is located on the upstream side of the centrifugal separation part (22) along the flow direction of the lubricating oil in the oil hole (11); the pump oil part (3) has opposite first and second ends, the first end is opposite to the centrifugal separation part (22), and the first end is provided with an oil return hole (5) opposite to the inlet (24), the oil return hole (5) penetrates to the second end; the pump body assembly further comprises a second filter part (6) for filtering the lubricating oil flowing out of the oil return hole (5).

9. A compressor characterized by: The lubricating oil filtering device (2) comprises the compressor of any one of claims 1-5; or the crankshaft structure of claim 6; or the pump body assembly of claim 7 or 8. The pump oil part (3) is located on the upstream side of the centrifugal separation part (22) along the flow direction of the lubricating oil in the oil hole (11); the pump oil part (3) has opposite first and second ends, the first end is opposite to the centrifugal separation part (22), and the first end is provided with an oil return hole (5) opposite to the inlet (24), the oil return hole (5) penetrates to the second end; the pump body assembly further comprises a second filter part (6) for filtering the lubricating oil flowing out of the oil return hole (5). The lubricating oil filtering device (2) comprises the compressor of any one of claims 1-5; or the crankshaft structure of claim 6; or the pump body assembly of claim 7 or 8.

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