Oil pumping device of compressor and compressor

Abstract

The invention relates to an oil pumping device of a compressor and the compressor. According to one aspect of the invention, the compressor comprises a rotating shaft with a body, and the oil pumping device comprises a pump body which defines a pump body cavity; the impeller is arranged in the pump body cavity, a volume cavity used for pumping oil is defined between the pump body and the impeller, and an impeller cavity is defined in the impeller; the oil pumping device comprises an impeller and a driving component, the driving component is arranged in a cavity of the impeller and used for actuating the impeller, and the driving component is a shaft head which extends from a body of the rotating shaft and can integrally rotate with the body of the rotating shaft. The pushing piece is at least partially arranged between the shaft head and the impeller and can rotate integrally with the shaft head, and the pushing piece can move in the radial direction relative to the shaft head and can push the impeller towards the pump body in the radial direction when the oil pumping device operates.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and particularly to a positive displacement pump oil device for a compressor with an improved actuation method. Background Art

[0002] The content of this section only provides background information related to the present disclosure, which may not constitute prior art.

[0003] A positive displacement oil pump (pump oil device) is an oil pump that pumps oil by utilizing the change in the volume inside the pump. The following will refer to Figure 1 and Figure 2 to describe the structure and working principle of a positive displacement oil pump in the related art.

[0004] A positive displacement oil pump in the related art includes a pump body, a shaft head, and an impeller. Among them, the shaft head extends from the main body of the rotating shaft and is configured as an eccentric shaft head. During the operation of the positive displacement oil pump, the rotating shaft rotates, and the integrally rotating eccentric shaft head presses the impeller disposed between the pump body and the eccentric shaft head to move.

[0005] Figure 1 shows a perspective view of a positive displacement oil pump in the related art, and Figure 2 shows the shaft head of a positive displacement oil pump in the related art. In the positive displacement oil pump of the compressor 100 shown in Figure 1 , it includes a pump body 101, an impeller 102, and a shaft head 103. Among them, the impeller 102 is disposed between the pump body 101 and the shaft head 103, and the impeller 102 has a protrusion inserted into a recess on the inner surface of the pump body 101. As shown in Figure 2 , the shaft head 103 is an eccentric shaft head extending from the main body of the rotating shaft. During the operation of the positive displacement oil pump 100, the shaft head 103 rotates, and the eccentric shaft head presses the impeller 102 to move generally in the radial direction, so as to form a cavity (volume chamber) with a continuously changing volume in the pump body 101, thereby achieving the purpose of pumping oil.

[0006] The main problem of the positive displacement oil pump in the related art is that since the shaft head needs to be configured as an eccentric shaft head and this eccentric shaft head is used to directly contact the impeller, the requirement for the machining accuracy of the eccentric shaft head and the main body of the rotating shaft is relatively high, and the processing cost is relatively high. Moreover, if the main body of the rotating shaft undergoes axial deformation, it will cause uneven contact between the eccentric shaft head and the impeller. In the related design, there is a certain gap between the outer wall of the eccentric shaft head and the inner wall of the impeller. When the positive displacement oil pump is operating, the rotation of the main body of the rotating shaft will cause the eccentric shaft head to unevenly strike the inner wall of the impeller. Especially in the case of high-speed operation, this uneven contact will cause obvious wear on the inner wall of the impeller, resulting in its failure.

[0007] Accordingly, there is a need for an improved positive displacement oil pumping device, in which the machining difficulty and machining cost of the shaft head of the positive displacement oil pumping device and thus the rotating shaft of the associated compressor are lower, and / or the wear on the inner wall of the impeller can be effectively reduced, reducing the likelihood of impeller failure. Summary of the Invention

[0008] In this section, a general summary of the invention is provided, rather than a complete disclosure of the full scope of the invention or all features of the invention.

[0009] The object of the present invention is to solve or mitigate one or more of the above-mentioned technical problems.

[0010] One object of the present invention is to reduce the machining difficulty and machining cost of the shaft head of the oil pumping device and the rotating shaft of the associated compressor.

[0011] Another object of the present invention is to reduce the wear on the inner wall of the impeller, thereby reducing the likelihood of impeller failure.

[0012] To solve one or more of the above-mentioned technical problems, according to one aspect of the present invention, there is provided an oil pumping device for a compressor, the compressor including a rotating shaft having a body, the oil pumping device including: a pump body defining a pump body cavity; an impeller disposed in the pump body cavity and defining a volume chamber for pumping oil between the pump body and the impeller, the impeller defining an impeller cavity; and a driving member disposed in the impeller cavity and configured to actuate the impeller, the driving member being configured as a shaft head extending from the body of the rotating shaft and capable of rotating integrally with the body of the rotating shaft, wherein the oil pumping device further includes a pushing member at least partially disposed between the shaft head and the impeller and capable of rotating integrally with the shaft head, and the pushing member is capable of moving radially relative to the shaft head and, when the oil pumping device is operating, is capable of radially pressing the impeller towards the pump body.

[0013] In the above-mentioned oil pumping device, the shaft head is configured as a concentric shaft head concentric with the body of the rotating shaft.

[0014] In the above-mentioned oil pumping device, a notch is provided at the outer peripheral portion of the shaft head, and a part of the pushing member is disposed in the notch and is capable of moving radially relative to the notch.

[0015] In the above-mentioned oil pumping device, the shaft head is hollow and has a side wall, and the notch is a through hole penetrating the side wall or a groove provided in the side wall.

[0016] In the above-mentioned oil pumping device, the pushing member is configured as a substantially cylindrical ejector rod.

[0017] In the above-mentioned oil pumping device, the ejector rod has a rounded outer end for abutting against the inner wall of the impeller.

[0018] In the above-mentioned oil pumping device, the pushing member is configured as an umbrella-shaped member, and the umbrella-shaped member has a rod-shaped portion and a head portion with a mass greater than that of the rod-shaped portion.

[0019] In the above-mentioned oil pumping device, the head portion of the umbrella-shaped member has a first surface and a second surface opposite to each other. The first surface is connected to the rod-shaped portion, and the second surface is arc-shaped and configured to match the shape of the inner wall of the impeller.

[0020] In the above-mentioned oil pumping device, the pushing member is configured such that the centroid of the pushing member is closer to the outer end of the pushing member than the center of the pushing member.

[0021] In the above-mentioned oil pumping device, the pushing member has an outer portion and an inner portion, and the density of the material of the outer portion is greater than the density of the material of the inner portion.

[0022] In the above-mentioned oil pumping device, the density of the material of the pushing member is greater than the density of the material of the shaft head, and / or greater than the density of the material of the impeller, and / or greater than the density of the material of the pump body.

[0023] In the above-mentioned oil pumping device, the oil pumping device further includes an elastic member, and the elastic member engages with the inner portion of the pushing member to radially bias the pushing member outward.

[0024] In the above-mentioned oil pumping device, the shaft head, the impeller, and the pushing member are configured such that the shaft head is always spaced apart from the impeller and the pushing member is always in contact with the inner wall of the impeller during the operation of the oil pumping device.

[0025] In the above-mentioned oil pumping device, the shaft head and the body of the rotating shaft are integrally formed.

[0026] According to another aspect of the present invention, there is provided another oil pumping device for a compressor. The compressor includes a rotating shaft having a body. The oil pumping device includes: a pump body defining a pump body cavity; an impeller disposed in the pump body cavity and defining a volume cavity for pumping oil between the pump body and the impeller, the impeller defining an impeller cavity; and a driving member disposed in the impeller cavity and configured to actuate the impeller. The driving member is configured as a shaft head extending from the body of the rotating shaft and capable of rotating integrally with the body of the rotating shaft. Wherein, the oil pumping device further includes a pushing member, the pushing member is fixed to the outer sidewall of the shaft head in a manner of partially surrounding the shaft head and is located between the shaft head and the impeller, and the pushing member is capable of radially pressing the impeller towards the pump body during the operation of the oil pumping device.

[0027] In the above-mentioned oil pumping device, the shaft head is configured as a concentric shaft head concentric with the body of the rotating shaft.

[0028] In the above-described oil pumping device, the pushing member is configured as an arc-shaped gasket. The inner surface of the arc-shaped gasket is configured to match the shape of the outer sidewall of the shaft head, and the outer surface of the arc-shaped gasket matches the shape of the inner wall of the impeller. Thus, in the assembled state, the pushing member can be in contact with both the outer sidewall of the shaft head and the inner wall of the impeller simultaneously.

[0029] In the above-described oil pumping device, a recessed portion is provided on the outer sidewall of the shaft head, and a hole is provided in the pushing member. Among them, the pushing member is fixed to the outer sidewall of the shaft head by a fastener that is embedded in the recessed portion and inserted into the hole.

[0030] According to another aspect of the present invention, a compressor is further provided, which includes the above-described oil pumping device.

[0031] In the above-described pump compressor, the compressor is a scroll compressor and includes a bottom bearing for supporting the bottom end of the rotating shaft and a bottom bearing seat for supporting the bottom bearing. The oil pumping device further includes an outer cylinder portion extending from the bottom bearing seat, and the pump body is arranged in the outer cylinder portion.

[0032] The advantages of the positive displacement oil pumping device and the related compressor according to the present invention are as follows. The shaft head (driving member) of the positive displacement oil pumping device according to the present invention can be a concentric shaft head that is concentric with the body of the rotating shaft of the compressor or can be an eccentric shaft head manufactured in a manner that does not require strict control of dimensional tolerances. And / or, the positive displacement oil pumping device has a pushing member disposed between the shaft head and the impeller, which can freely slide in the radial direction to push the impeller particularly by means of centrifugal force during the operation of the oil pumping device, or the pushing member is a split member fixedly mounted to the shaft head. Therefore, the shaft head does not directly contact the impeller, resulting in lower requirements for the machining accuracy of the shaft head and the rotating shaft body, being easier to machine, thereby reducing the machining cost. And / or, the contact between the pushing member and the inner wall of the impeller is more uniform (particularly, the pushing member is always in flexible contact with the inner wall of the impeller during the operation of the oil pumping device), effectively reducing the wear of the impeller, thereby reducing the possibility of impeller failure, and thus obtaining a more reliable and stable oil pumping effect. Description of the Drawings

[0033] The following drawings show the technical features of one or more embodiments of the related art oil pumping device and the oil pumping device of the present invention. In the drawings:

[0034] Figure 1 is a perspective view of the related art oil pumping device;

[0035] Figure 2 is a perspective view of the rotating shaft of the related art oil pumping device;

[0036] Figure 3 is an exploded view of the oil pumping device according to the first embodiment of the present invention;

[0037] Figure 4 is a perspective view of a rotating shaft of an oil pumping device according to a first embodiment of the present invention;

[0038] Figure 5 is a cross-sectional view of a rotating shaft of an oil pumping device according to a first embodiment of the present invention;

[0039] Figure 6 is a perspective view of a pusher of an oil pumping device according to a first embodiment of the present invention;

[0040] Figure 7 is a perspective view of an oil pumping device according to a first embodiment of the present invention;

[0041] Figure 8 is a top view of an oil pumping device according to a first embodiment of the present invention;

[0042] Figure 9 is a perspective view of a pusher of an oil pumping device according to a second embodiment of the present invention;

[0043] Figure 10 is an exploded view of an oil pumping device according to a third embodiment of the present invention;

[0044] Figure 11 is a perspective view of a rotating shaft of an oil pumping device according to a third embodiment of the present invention;

[0045] Figure 12 is a perspective view of a pusher of an oil pumping device according to a third embodiment of the present invention; and

[0046] Figure 13 is a top view of an oil pumping device according to a third embodiment of the present invention. Detailed Embodiments

[0047] The present invention will be described in detail below with reference to the accompanying drawings and by means of specific embodiments. The following detailed description of the present invention is for illustrative purposes only and is in no way a limitation on the present invention and its application or use.

[0048] The present invention provides an improved oil pumping device (positive displacement oil pump) for a compressor. The oil pumping device may have a drive member configured as a shaft head concentric with the rotating shaft of the compressor, and the oil pumping device may also have a pusher at least partially disposed between the shaft head and the impeller and capable of rotating integrally with the shaft head. The pusher can move radially relative to the shaft head to press the impeller towards the pump body of the oil pumping device.

[0049] First, with reference to Figures 3 - 8 the overall structure and working principle of the oil pumping device according to the first embodiment of the present invention will be described schematically.

[0050] Figure 3 is an exploded view of an oil pumping device according to a first embodiment of the present invention, Figure 4 is a perspective view of a rotating shaft of the oil pumping device according to a first embodiment of the present invention, Figure 5 is a cross-sectional view of the rotating shaft of the oil pumping device according to a first embodiment of the present invention, and Figure 6 is a perspective view of a pusher of the oil pumping device according to a first embodiment of the present invention. The following will refer to Figures 3 - 6 to describe each component of the oil pumping device according to a first embodiment of the present invention.

[0051] As Figure 3 shown, an oil pumping device 10 according to a first embodiment of the present invention includes a pump body 11, an impeller 12, a drive member, and an outer cylinder portion 15. The oil pumping device 10 is for a compressor, such as a scroll compressor, and the drive member of the oil pumping device 10 is configured as a shaft head 132 of a rotating shaft 13 of the compressor. The pump body 11 is generally annular to define a pump body cavity, and a recess is provided in an inner portion of the pump body 11. The impeller 12 is also generally annular to define an impeller cavity, and the diameter of the impeller 12 is smaller than the diameter of the pump body cavity of the pump body 11, such that in an assembled state of the oil pumping device 10, the impeller 12 is disposed in the pump body cavity and a volume chamber for pumping oil is defined between the pump body 11 and the impeller 12. The impeller 12 has a protrusion 121 provided on its outer wall, and in the assembled state of the oil pumping device 10, the protrusion 121 is arranged to be inserted into the recess of the pump body 11, so as to prevent free rotation of the impeller 12. The rotating shaft 13 has a main body 131 and a shaft head 132, and a hollow passage is provided in the rotating shaft 13. The shaft head 132 extends axially from a top surface of the main body 131. The shaft head 132 of the rotating shaft 13 may be integrally formed with the main body 131, such that the shaft head 132 can rotate integrally with the main body 131. The shaft head 132 of the rotating shaft 13 has a diameter smaller than that of the main body 131. The diameter of the shaft head 132 of the rotating shaft 13 is smaller than the diameter of the impeller cavity, such that in the assembled state of the oil pumping device 10, the shaft head 132 can be disposed in the impeller cavity and is used to actuate the impeller 12. A notch is provided at an outer peripheral portion of the shaft head 132 of the rotating shaft 13, and in this embodiment, the notch is implemented as a through hole 133 provided on a side wall of the shaft head 132. The specific structure of the rotating shaft 13 will be described below with reference to Figure 4 and Figure 5A detailed description will be given. In the assembled state of the oil pumping device 10, the pushing member 14 is at least partially disposed between the shaft head 132 and the impeller 12. In this embodiment, the pushing member 14 is configured as a substantially cylindrical ejector rod, and the diameter of the ejector rod is smaller than the diameter of the through hole 133 on the shaft head 132, so that the ejector rod can pass through the through hole 133 and form a clearance fit with the through hole 133. The specific structure of the pushing member 14 will be described in detail below with reference to Figure 6 A compressor including the oil pumping device 10 according to the first embodiment of the present invention includes a bottom bearing for supporting the bottom of the rotating shaft 13 and a bottom bearing housing for supporting the bottom bearing. The oil pumping device 10 further includes an outer cylinder portion 15 extending from the bottom bearing housing. In the assembled state of the oil pumping device 10, the pump body 11 is disposed in the outer cylinder portion 15 and remains fixed relative to the outer cylinder portion 15.

[0052] As Figure 4 and Figure 5 shown, the shaft head 132 of the rotating shaft 13 can be configured as a concentric shaft head concentric with the body 131, that is to say, they have the same central axis X 1 . Compared with the rotating shaft of a compressor including an oil pumping device in the related art having an eccentric shaft head (in particular, an eccentric shaft head manufactured by a method of strictly controlling dimensional tolerances), the configuration of the shaft head according to the present embodiment makes the processing difficulty and processing cost of the rotating shaft of the compressor lower. And, since the shaft head does not need to be in direct contact with the impeller, the requirement for its machining accuracy is also lower. The shaft head 132 is hollow and a through hole 133 penetrating the side wall is provided on the side wall of the shaft head 132 for clearance fit with the pushing member 14 passing through the through hole 133.

[0053] As Figure 6As shown, the pusher 14 is configured as a push rod having a generally cylindrical shape and has a rounded outer end 141 for abutting against the inner wall of the impeller 12 and forming a relatively uniform contact with the inner wall of the impeller 12 to radially press the impeller 12 towards the pump body 11. The pusher 14 has a relatively large mass and can be integrally formed from a metal material. For example, the density of the material of the pusher can be greater than the density of the material of the shaft head, and / or greater than the density of the material of the impeller, and / or greater than the density of the material of the pump body. The pusher 14 can be configured such that its center of mass is closer to the outer end 141 than to the center. For example, the pusher 14 can include an inner portion and an outer portion made of different materials, wherein the outer end 141 is located at the end of the outer portion. The density of the material used for the outer portion of the pusher 14 can be greater than the density of the material used for the inner portion. In some embodiments, the outer portion of the pusher 14 can be coated with a material having a relatively large density on the outer layer to increase the density and mass of the outer portion. The inner portion and the outer portion of the pusher 14 can be integral or separate, and when the inner portion and the outer portion of the pusher 14 adopt a separate structure, they can be connected together through a fastening structure. The pusher 14 can pass through the through hole 133 on the shaft head 132 and is in clearance fit with the through hole 133, so that the pusher 14 can slide in the through hole 133 in the radial direction relative to the through hole 133, and thus the pusher 14 can move radially relative to the shaft head 132.

[0054] Figure 7 is a perspective view of an oil pumping device according to a first embodiment of the present invention, and Figure 8 is a top view of an oil pumping device according to a first embodiment of the present invention. The working principle and the obtained technical effects of the oil pumping device according to the first embodiment of the present invention will be described below with reference to Figure 7 and Figure 8 thereof.

[0055] Figure 7 and Figure 8Both show the assembled oil pumping device according to the first embodiment of the present invention. As shown, in the assembled oil pumping device 10, the pump body 11 can be accommodated in the outer cylinder part 15 and remain fixed relative to the outer cylinder part 15. The impeller 12 is arranged in the pump body cavity of the pump body 11, and the convex part 121 of the impeller 12 is inserted into the concave part of the pump body 11. A volume cavity for pumping oil is defined between the pump body 11 and the impeller 12. The shaft head 132 is arranged in the impeller cavity, and the shaft head 132 does not form direct contact with the impeller 12. The oil pumping device 10 may further include a pump end plate (not shown), which is assembled with the pump body 11 to cover the impeller 12, and an oil inlet hole may be provided on the pump end plate to allow oil to enter the volume cavity. The pusher 14 is arranged to pass through the through hole 133 on the shaft head 132 of the rotating shaft 13 and form a clearance fit with the through hole 133, and the outer part of the pusher 14 is arranged between the shaft head 132 and the impeller 12. During the operation of the oil pumping device 10, the body of the rotating shaft 13 of the compressor rotates and drives the shaft head 132 to rotate integrally. During the rotation of the shaft head 132, the pusher 14 is affected by the centrifugal force and moves outward in the radial direction relative to the shaft head 132 (i.e., towards the direction of the impeller). Since the mass of the pusher 14 is relatively large, and the centroid of the pusher 14 is closer to the outer end 141 in contact with the impeller than its center, the pusher 14 can maintain relatively uniform contact with the inner wall of the impeller 12 (for example, within a certain rotational speed range, the pusher 14 always adheres to the inner wall of the impeller 12 and maintains flexible contact with the inner wall of the impeller 12), and radially presses the impeller 12 towards the pump body 11, thereby causing the impeller 12 to move relative to the pump body 11. During the movement of the impeller 12, the volume of the volume cavity defined between the pump body 11 and the impeller 12 continuously changes, so as to achieve the purpose of pumping oil. During the operation of the oil pumping device 10, the pusher 14 always separates the shaft head 132 from the impeller 12, so that the shaft head 132 does not directly contact the impeller 12. And by setting the pusher 14, the impeller 12 has a certain radial flexibility during the oil pumping process. Thus, for example, when there are impurities between the impeller 12 and the pump body 11, the impeller 12 can move radially inward to avoid them, thereby reducing the wear of the impeller 12 and the pump body 11 caused by the impurities.

[0056] Compared with the prior art pump oil device that directly uses the eccentric shaft head of the rotating shaft as the driving member, the pump oil device according to the first embodiment of the present invention has the following advantages. The pump oil device has a pushing member for being arranged between the shaft head and the impeller to push the impeller, without the shaft head itself pushing the impeller, and avoids the direct contact between the shaft head and the impeller in terms of diameter. Therefore, the shaft head of the rotating shaft of the compressor can be set to be concentric with the main body of the rotating shaft, and the machining accuracy requirements for the shaft head are relatively low, thereby reducing the machining difficulty of the rotating shaft and saving machining costs. And / or, during the operation of the pump oil device, the pushing member can maintain a relatively uniform contact with the inner wall of the impeller during the process of pushing the impeller, so the wear of the inner wall of the impeller can be reduced, thereby reducing the possibility of impeller failure, and thus a more reliable and stable pump oil effect is obtained.

[0057] Figure 9 FIG. 4 is a perspective view of the pushing member of the pump oil device according to the second embodiment of the present invention. The main difference between the pump oil device according to the second embodiment and the pump oil device according to the first embodiment lies in the different configurations of the pushing member, while the other components and the overall structure of the pump oil device are basically the same. Therefore, the description of the other components and the overall structure of the pump oil device will be omitted.

[0058] As Figure 9 shown, the pushing member 24 of the pump oil device according to the second embodiment of the present invention is configured as an umbrella-shaped member, which has a rod-shaped portion 241 and a head portion 242. The rod-shaped portion 241 is substantially cylindrical, and the head portion 242 has a first surface and a second surface opposite to each other. The first surface of the head portion 242 is connected to the rod-shaped portion 241, and the second surface of the head portion 242 is arc-shaped and configured to match the shape of the inner wall of the impeller, so as to be able to fit the inner wall of the impeller. The first surface of the head portion 242 of the pushing member 24 may be flat. The mass of the head portion 242 of the pushing member 24 is greater than the mass of the rod-shaped portion 241. For example, the head portion 242 and the rod-shaped portion 241 of the pushing member 24 may be made of different materials, and the density of the material of the head portion 242 may be greater than the density of the material of the rod-shaped portion 241. The rod-shaped portion 241 and the head portion 242 of the pushing member 24 may be integrally formed or may be separate and fixed together by fasteners. During the operation of the pump oil device, the pushing member 24 is subjected to the action of centrifugal force and moves outward in the radial direction, and the head portion 242 of the pushing member 24 can closely fit the inner wall of the impeller and push the impeller to move the impeller relative to the pump body. Compared with the pushing member 14 according to the first embodiment, the pushing member 24 according to the second embodiment has a larger contact area with the inner wall of the impeller and can fit more closely to the inner wall of the impeller, thereby further reducing the wear of the inner wall of the impeller.

[0059] The following will refer to Figures 10 - 13To describe the oil pumping device according to the third embodiment of the present invention. The main difference between the oil pumping device according to the third embodiment and the oil pumping device according to the first embodiment lies in the configuration of the pushing member and the way the pushing member cooperates with the shaft head of the rotating shaft. The other components and the overall structure of the oil pumping device are basically the same. Therefore, the rotating shaft and the pushing member of the oil pumping device will be mainly described, and the description of the other components and the overall structure of the oil pumping device will be omitted.

[0060] Figure 10 is an exploded view of the oil pumping device according to the third embodiment of the present invention, Figure 11 is a perspective view of the rotating shaft of the oil pumping device according to the third embodiment of the present invention, and Figure 12 is a perspective view of the pushing member of the oil pumping device according to the third embodiment of the present invention. Figure 13 is a top view of the oil pumping device according to the third embodiment of the present invention.

[0061] As Figure 10 shown, the oil pumping device 30 according to the third embodiment of the present invention includes a pump body 31, an impeller 32, a rotating shaft 33, a driving member, and an outer cylinder portion. The oil pumping device 10 is used for a compressor, and the driving member of the oil pumping device 30 is configured as the shaft head 332 of the rotating shaft 33 of the compressor. The rotating shaft 33 further includes a body 331. Two recesses 333 for fasteners 35 are symmetrically provided on the outer side wall of the shaft head 332. The specific structure of the rotating shaft 33 will be described in detail below with reference to Figure 11 In this embodiment, the pushing member 34 is fixed to the outer side wall of the shaft head of the rotating shaft 33 in a manner of partially surrounding the shaft head and is located between the shaft head 332 and the impeller 32. The pushing member 34 can be configured as an arc-shaped gasket, which is provided with holes 341 for fasteners 35 at both ends, and the pushing member 34 is fixed to the shaft head 332 by the fasteners 35. The specific structure of the pushing member 34 will be described in detail below with reference to Figure 12 In detail.

[0062] As Figure 11 shown, the shaft head 332 of the rotating shaft 33 can be configured as a concentric shaft head concentric with the body 331, that is to say, they have the same central axis. And two recesses 333 are symmetrically provided on the side wall of the shaft head 332, so that the two fasteners 35 can be respectively embedded in the two recesses 333 to form an interference fit. As Figure 12As shown, the driving member 34 is configured as an arc-shaped gasket. Its inner surface 342 is configured to match the shape of the outer wall of the shaft head 332 of the rotating shaft 33, and its outer surface 343 matches the shape of the inner wall of the impeller 32. Thus, in the assembled state, the driving member 34 can simultaneously conform to the outer wall of the shaft head 332 of the rotating shaft 33 and the inner wall of the impeller 32. The driving member 34 is provided with holes 341 at its two ends, and the positions of these two holes 341 correspond to the positions of the recesses 333 on the shaft head 332, such that two fasteners 35 can be respectively inserted into these two holes 341 to form an interference fit. Thereby, the driving member 34 is fixed between the shaft head 332 and the impeller 32 by the fasteners 35 and tightly conforms to the outer wall of the shaft head 332 of the rotating shaft 33 and the inner wall of the impeller 32. In some embodiments, the driving member can be made of a material that is softer than the shaft head material and / or the impeller material. Alternatively, the driving member can be made of a material that is more wear-resistant than the shaft head material and / or the impeller material or a material that can form a friction pair with the impeller to reduce impeller wear. In addition, it should be noted that the above configuration of the driving member and the fixed connection structure between the driving member and the shaft head are merely illustrative. For example, the driving member can have other configurations, and the driving member can have more or fewer holes for fasteners, while the shaft head can have more or fewer recesses for fasteners. Also, the driving member can be fixed to the shaft head by other means.

[0063] Figure 13 is a top view of the oil pumping device according to the third embodiment of the present invention. The working principle and the obtained technical effects of the oil pumping device according to the third embodiment of the present invention will be described below with reference to Figure 13 to describe the working principle and the obtained technical effects of the oil pumping device according to the third embodiment of the present invention.

[0064] Figure 13 shows the assembled oil pumping device according to the third embodiment of the present invention. As Figure 13As shown, in the assembled oil pumping device 30, the pusher 34 is arranged between the shaft head 332 and the impeller 32, and closely fits against the outer side wall of the shaft head 332 and the inner wall of the impeller 32. During the operation of the oil pumping device 30, the pusher 34 radially presses the impeller 32 towards the pump body 31 so that the impeller 32 moves relative to the pump body 31. During the movement of the impeller 32, the volume of the volume chamber defined between the pump body 31 and the impeller 32 continuously changes, thereby achieving the purpose of pumping oil. Compared with the oil pumping devices according to the first and second embodiments of the present invention, the pusher of the oil pumping device according to the third embodiment of the present invention is configured as an arc-shaped gasket that is fixed relative to the shaft head of the rotating shaft and remains in contact with the outer side wall of the shaft head of the rotating shaft and the inner wall of the impeller, so that the pusher is more stably in contact with the inner wall of the impeller, and the contact area is larger, thereby further reducing the wear of the inner wall of the impeller. In addition, since the pusher can be made of a material that is more wear-resistant than the shaft head material and / or the impeller material or a material that can form a friction pair with the impeller to reduce the wear of the impeller, it is more beneficial to reduce the wear of the inner wall of the impeller.

[0065] In addition, it should be noted that although different technical solutions of the fluid guiding device according to the present invention are described in the foregoing embodiments, it can be understood that the technical solutions in the above embodiments are merely illustrative rather than restrictive, and various modifications can be made. For example, the configuration of the pusher of the oil pumping device and its cooperation mode with the shaft head of the rotating shaft can adopt different forms. In one modification, on the basis of the first embodiment, an elastic member, such as a spring, can be arranged between the inner end of the pusher opposite to the outer end and the inner wall of the impeller to bias the pusher in the radially outward direction by the elastic force of the spring to press the impeller. The spring can be engaged with the inner part of the pusher. In another modification, the notch provided at the outer peripheral portion of the shaft head can be implemented as a groove instead of a through hole. The groove is provided in the outer side wall of the shaft head and is used to accommodate the pusher, and the pusher is partially accommodated in the groove in a clearance fit manner and can move radially relative to the groove. Optionally, an elastic member, such as a reed, can be arranged at the bottom of the groove to bias the pusher in the radially outward direction by the elastic force of the reed to press the impeller. In yet another modification, the body and the shaft head of the rotating shaft of the compressor can be separate, and the shaft head is connected to the body by a fastener so that they can rotate integrally. In yet another modification, the shaft head of the rotating shaft as the driving member of the oil pumping device does not necessarily have to be a concentric shaft head concentric with the body of the rotating shaft. For example, the shaft head can also be an eccentric shaft head. In particular, an eccentric shaft head manufactured by a method of not strictly controlling dimensional tolerances, whereby the processing accuracy can still be appropriately reduced to simplify processing and reduce costs.

[0066] Although the present invention has been described with reference to exemplary specific embodiments, it should be understood that the present invention is not limited to the specific embodiments described and illustrated in detail herein, and those skilled in the art can make various changes to the exemplary specific embodiments without departing from the scope defined by the claims.

Claims

1. An oil pumping device (10) for a compressor, the compressor comprising a rotating shaft (13) having a body (131), the oil pumping device comprising: A pump body (11), wherein the pump body defines a pump body cavity; An impeller (12) is arranged in the pump body cavity and defines a volume chamber for pumping oil between the pump body and the impeller, and the impeller defines an impeller cavity; as well as a driving member, the driving member being arranged in the impeller cavity and used to actuate the impeller, the driving member being configured as a shaft head (132) extending from the body of the rotating shaft (13) and being rotatable integrally with the body of the rotating shaft (13), It is characterized in that the oil pumping device also includes a pushing member (14, 24), which is at least partially arranged between the shaft head and the impeller and can rotate integrally with the shaft head, and the pushing member can move radially relative to the shaft head and can push the impeller radially toward the pump body when the oil pumping device is running.

2. The oil pumping device (10) according to claim 1, characterized in that: The shaft head is configured as a concentric shaft head that is concentric with the body of the rotating shaft.

3. The oil pumping device (10) according to claim 1, characterized in that: A notch is provided at the outer circumference of the shaft head (132), and a portion of the pusher is arranged in the notch and is radially movable relative to the notch.

4. The oil pumping device (10) according to claim 3, characterized in that: The shaft head (132) is hollow and has a side wall, and the recess is a through hole penetrating the side wall or a groove arranged in the side wall.

5. The oil pumping device (10) according to claim 4, characterized in that: The pushing member (14) is configured as a substantially cylindrical push rod.

6. The oil pumping device (10) according to claim 5, characterized in that: The push rod has a rounded outer end (141) for abutting against the inner wall of the impeller.

7. The oil pumping device (10) according to claim 4, characterized in that: The pushing member (24) is configured as an umbrella-shaped member having a rod-shaped portion (241) and a head portion (242) having a mass greater than that of the rod-shaped portion.

8. The oil pumping device (10) according to claim 7, characterized in that: The head of the umbrella-shaped member has a first surface and a second surface opposite to each other, the first surface is connected to the rod-shaped portion, and the second surface is arc-shaped and configured to match the shape of the inner wall of the impeller.

9. The oil pumping device (10) according to any one of claims 1 to 8, characterized in that: The pusher is configured such that a center of mass of the pusher is closer to an outer end of the pusher than a center of the pusher.

10. The oil pumping device (10) according to any one of claims 1 to 8, characterized in that The pusher has an outer portion and an inner portion, and the density of the material of the outer portion is greater than the density of the material of the inner portion.

11. The oil pumping device (10) according to any one of claims 1 to 8, characterized in that: The density of the material of the pusher is greater than the density of the material of the shaft head, and / or greater than the density of the material of the impeller, and / or greater than the density of the material of the pump body.

12. The oil pumping device (10) according to any one of claims 1 to 8, characterized in that The oil pumping device further includes an elastic member engaged with an inner portion of the pusher to bias the pusher radially outward.

13. The oil pumping device (10) according to any one of claims 1 to 8, characterized in that The shaft head, the impeller and the pusher are configured such that when the oil pumping device is in operation, the shaft head is always spaced apart from the impeller and the pusher is always in contact with the inner wall of the impeller.

14. The oil pumping device (10) according to any one of claims 1 to 8, characterized in that The shaft head is formed integrally with the body of the rotating shaft.

15. An oil pumping device (30) for a compressor, the compressor comprising a rotating shaft (33) having a body (331), the oil pumping device comprising: A pump body (31), the pump body defining a pump body cavity; an impeller (32), the impeller being arranged in the pump body cavity and defining a volume chamber for pumping oil between the pump body and the impeller, the impeller defining an impeller cavity; as well as a driving member, the driving member being arranged in the impeller cavity and used to actuate the impeller, the driving member being configured as a shaft head (332) extending from the body of the rotating shaft (33) and being rotatable integrally with the body of the rotating shaft (33), It is characterized in that the oil pumping device also includes a pushing member (34), which is fixed to the outer wall of the shaft head (332) in a manner of partially surrounding the shaft head (332) and is located between the shaft head and the impeller, and the pushing member can push the impeller radially toward the pump body when the oil pumping device is running.

16. The oil pumping device (30) according to claim 15, characterized in that The shaft head is configured as a concentric shaft head that is concentric with the body of the rotating shaft.

17. The oil pumping device (30) according to claim 16, characterized in that The pusher (34) is configured as an arc-shaped gasket, the inner surface (342) of the arc-shaped gasket is configured to match the shape of the outer wall of the shaft head (332), and the outer surface (343) of the arc-shaped gasket matches the shape of the inner wall of the impeller (32), so that in the assembled state, the pusher can simultaneously fit the outer wall of the shaft head and the inner wall of the impeller.

18. The oil pumping device (30) according to claim 17, characterized in that A recessed portion (333) is provided on the outer side wall of the shaft head (332), and a hole (341) is provided on the pusher (34), wherein the pusher is fixed to the outer side wall of the shaft head by a fastener (35) embedded in the recessed portion and inserted into the hole.

19. A compressor, characterized in that: The compressor comprises an oil pumping device according to any one of claims 1 to 18.

20. The compressor according to claim 19, characterized in that The compressor is a scroll compressor and includes a bottom bearing for supporting the bottom end of the rotating shaft and a bottom bearing seat for supporting the bottom bearing, and the oil pumping device also includes an outer cylinder portion extending from the bottom bearing seat, and the pump body is arranged in the outer cylinder portion.

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