CN210135051U

CN210135051U - Shaft assembly and compressor comprising same

Info

Publication number: CN210135051U
Application number: CN201920931471.2U
Authority: CN
Inventors: 彭楠; 周启明; 蔺斌
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-03-10
Anticipated expiration: 2029-06-19
Also published as: WO2020253796A1

Abstract

The present disclosure relates to a shaft assembly of a compressor and a compressor including the same. In one aspect, a shaft assembly for a compressor is provided and may include a first body and a second body configured to rotate integrally with the first body, the second body may provide an axial thrust surface of the shaft assembly that contacts a corresponding component of the compressor. According to the present disclosure, wear of an axial thrust surface of a compressor drive shaft and a surface in contact therewith can be reduced, production costs of the compressor drive shaft/compressor can be reduced, a machining process of the compressor drive shaft/compressor can be simplified, and/or the compressor drive shaft can be easily repaired.

Description

Shaft assembly and compressor comprising same

Technical Field

The present disclosure relates to the field of compressors, and in particular, to a shaft assembly of a compressor and a compressor including the same.

Background

This section provides background information related to the present disclosure, but such information does not necessarily constitute prior art.

Compressors are used in applications such as refrigeration systems, air conditioning systems, and heat pump systems. When the compressor is operating, the motor typically rotates a drive shaft, which in turn drives a compression mechanism (e.g., scroll, piston, screw, etc.) to compress a volume of fluid (e.g., air, refrigerant, etc.). In actual operation of the compressor, the drive shaft may come into contact with another component of the compressor and undergo relative rotation, resulting in wear occurring between the contact surfaces. In particular, compressors according to the related art are generally provided with thrust washers for withstanding the weight of the drive shaft, and in practice, there is constant relative friction between the rotating drive shaft and the thrust washer remaining stationary, resulting in great wear challenges to both the thrust surface of the drive shaft and the thrust washer.

In general, in order to avoid such wear, the drive shaft of the compressor needs to be selected to be a material having high wear resistance, and the thrust washer needs to be anodized coated as well, which greatly increases the manufacturing cost of the compressor. In addition, in the case where the compressor employs a positive displacement oil pump, the drive shaft also needs to be manufactured to have an eccentric shaft end. This increases the wear on the thrust washer of the oil pump, since the shaft end face needs to be machined on the basis of the center of the eccentric hole during machining, which usually results in a sharp peak at the outer edge portion of the shaft end face. Thus, in this case, it may be necessary to perform secondary machining of the shaft end face, for example, further grinding after general turning of the shaft end face.

In addition, in the existing compressor, after the thrust surface of the shaft is worn, the entire drive shaft needs to be removed to perform maintenance on the end surface of the shaft. Therefore, the existing solution has the problems of complex processing technology, high processing cost, difficult maintenance and the like.

SUMMERY OF THE UTILITY MODEL

This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.

It is an object of the present disclosure to provide a compressor drive shaft and/or a compressor including such a drive shaft that is capable of reducing wear of the axial thrust surfaces and the surfaces in contact therewith.

Another object of the present disclosure is to provide a compressor drive shaft and/or a compressor including the same, which can reduce production costs and/or can simplify a manufacturing process.

Another object of the present disclosure is to provide a compressor drive shaft and/or a compressor including the same, which can be easily repaired.

To achieve one or more of the above objects, according to a first aspect of the present disclosure, there is provided an axle assembly of a compressor, which may include a first body and a second body provided to rotate integrally with the first body, the second body may provide an axial thrust surface of the axle assembly that contacts a corresponding component of the compressor.

In some embodiments, the second body may be configured to be mounted on an axial end face of the first body.

In some embodiments, the first body may include an axle stub and the second body may be a sleeve mounted about the axle stub.

In some embodiments, the second body may be fixed or clearance fit mounted with the first body.

In some embodiments, the shaft assembly may be provided with a stop device that prevents rotation of the second body relative to the first body.

In some embodiments, the stopper device may include a first positioning portion provided on an axial end surface of the first body and a second positioning portion provided on an axial end surface of the second body.

In some embodiments, the stop means may comprise a first detent provided on the outer peripheral wall of the stub shaft and a second detent provided on the inner peripheral wall of the sleeve.

In some embodiments, the first and second locating portions may be planar or concave and convex surfaces that match in shape.

In some embodiments, the second body may have a higher wear resistance than the first body.

In some embodiments, the second body may be a component made of Vespel resin.

To achieve one or more of the above objects, according to another aspect of the present disclosure, there is provided a compressor that may include the shaft assembly as described above.

In some embodiments, the shaft head of the shaft assembly is an eccentric shaft head, the compressor may include an oil pump driven by the eccentric shaft head of the shaft assembly, and the counterpart is a thrust washer of the oil pump in contact with the axial thrust surface.

By adopting the above technical solution, the material of the first body can be freely selected, and only the second body is provided as a material having high wear resistance, and therefore, the production cost of the compressor drive shaft and/or the compressor can be greatly reduced. In addition, since the second body providing the axial thrust surface can be selected to be a material having high wear resistance, the friction between the drive shaft of the compressor and the surface in contact therewith, for example, the thrust washer of the oil pump, can be reduced, and the wear of the contact surface can be reduced. Further, since the second body may be a separate member mounted on the first body, even after the thrust surface of the second body is worn, only the second body may be reworked or only the second body may be replaced. Therefore, maintenance of the shaft assembly can be easily performed.

Drawings

The features and advantages of one or more embodiments of the present disclosure will become more readily apparent from the following description taken in conjunction with the accompanying drawings. The figures are not drawn to scale and some features may be exaggerated or minimized to show details of particular components. In the drawings:

fig. 1 shows a partial schematic sectional view of a compressor according to the related art.

Fig. 2 shows a partial schematic cross-sectional view of a compressor according to an embodiment of the present disclosure.

FIG. 3 illustrates a partial schematic cross-sectional view of a compressor shaft assembly according to an embodiment of the present disclosure.

FIG. 4 illustrates a schematic exploded perspective view of a compressor shaft assembly according to an embodiment of the present disclosure.

In the drawings, identical or corresponding technical features or components are denoted by identical or corresponding reference numerals.

Detailed Description

The disclosure will be described in detail below with the aid of exemplary embodiments with reference to the accompanying drawings. It is to be noted that the following detailed description of the present disclosure is intended for purposes of illustration only and is not intended to limit the present disclosure in any way.

It is also noted that, for the sake of clarity, not all features of an actual specific embodiment are described and illustrated in the specification and drawings, and that, in order to avoid obscuring the solution to which the present disclosure is directed in unnecessary detail, only the device structures closely related to the solution of the present disclosure are described and illustrated in the drawings and specification, and other details which are not relevant to the technical content of the present disclosure and known to those skilled in the art are omitted.

Before describing the embodiments of the present disclosure, a description will be first made of a compressor driving shaft according to the related art and problems thereof. It is to be noted that the compressor according to the related art and the compressor drive shaft according to the related art described herein do not necessarily fall within the scope of the related art.

Referring first to fig. 1, there is shown a partial schematic sectional view of a compressor 1 'according to the related art, wherein only portions of the compressor 1' relevant to describing the spirit of the present disclosure are shown in fig. 1 for clarity, while other less relevant portions are omitted. As shown in fig. 1, the compressor 1 'comprises a drive shaft 10' and a thrust washer 30 'for supporting the drive shaft 10', wherein the drive shaft 10 'comprises a shaft end face 101' at the lower end of the drive shaft 10 'and the shaft end face 101' provides an axial thrust surface of the drive shaft 10 'in contact with the thrust washer 30'. In actual operation of the compressor 1 ', the drive shaft 10 ' is rotated by the motor at high speed, while the thrust washer 30 ' remains stationary at all times. Due to this relative rotation between the driveshaft 10 ' and the thrust washer 30 ', the lower end face 101 ' of the driveshaft 10 ' and the upper surface of the thrust washer 30 ' will be constantly worn.

In the compressor 1 ' according to the related art, the driving shaft 10 ' is selected to have a material with high wear resistance and the thrust washer 30 ' is anodized-coated to reduce wear of the contact surface. However, this would result in the compressor 1' according to the related art having a high manufacturing cost. In addition, in the compressor 1 ' according to the related art, the lower end surface 101 ' of the driving shaft 10 ' as an axial thrust surface needs to be machined, and the process of such machining is generally complicated, and the maintenance of the driving shaft 10 ' after the lower end surface 101 ' is worn out is difficult and costly.

With respect to the problems in the compressor according to the related art as described above, it is possible to solve by a compressor shaft assembly/a compressor including the same according to an embodiment of the present disclosure. Hereinafter, a compressor shaft assembly and a compressor employing the same according to an embodiment of the present disclosure will be described with reference to fig. 2 to 4.

Referring first to fig. 3 and 4, a schematic cross-sectional view and an exploded perspective view, respectively, of a compressor drive shaft assembly (shaft assembly) 10 according to an embodiment of the present disclosure is shown. As shown in the drawings, the shaft assembly 10 includes a first body 100 and a second body 200, wherein the second body 200 is provided to rotate integrally with the first body 100, that is, the second body 200 cannot rotate relative to the first body 100.

As shown in fig. 2, the compressor 1 according to the embodiment of the present disclosure includes a shaft assembly 10 and an oil pump driven by the shaft assembly 10, wherein the oil pump is in contact with a second body 200 of the shaft assembly 10 through a thrust washer (oil pump wear plate) 30. In other words, the second body 200 provides an axial thrust surface 201 of the shaft assembly 10 that is in contact with the thrust washer 30 of the oil pump. It should be understood that the thrust washer 30 is merely an exemplary component that contacts the second body 200. The second body 200 may be in contact with other components of the compressor 1, for example, the second body 200 may be in contact with a thrust bearing of the compressor, without departing from the spirit and scope of the present disclosure. In other words, the spirit of the present disclosure may be applied to the second body 200 being in contact with any other corresponding part of the compressor 1.

According to embodiments of the present disclosure, since the thrust surface of the shaft assembly 10 is provided by the second body 200, the first body 100 does not need to provide an axial thrust surface and thus the choice of material thereof may be more free. For example, the first body 100 may be made of a relatively inexpensive material. In this way, the production cost of the compressor drive shaft can be greatly reduced. In addition, since it is only necessary to machine the shaft end face of the second body 200 that provides an axial thrust surface of the shaft assembly that contacts a counterpart of the compressor, it is easier to ensure desired roughness, flatness, etc. of the end face of the second body, thereby making it possible to reduce the risk of wear due to poor quality machining of the shaft end face.

In the exemplary embodiment, the oil pump of the compressor 1 is a positive displacement oil pump that sucks and discharges liquid via a change in volume. In this case, the shaft head of the shaft assembly 10 is provided as an eccentric shaft head, and the shaft assembly 10 drives the positive displacement oil pump of the compressor through the eccentric shaft head.

In the case of the positive displacement oil pump, the compressor according to the related art generally causes a peak at an outer edge portion of the shaft end face due to the necessity of processing the thrust surface of the drive shaft on the basis of the center of the eccentric hole. In a certain experiment conducted by the inventors, it was found that in the case of employing a positive displacement oil pump, the compressor according to the related art would have a peak of 0.003mm at the outer edge portion of the shaft end face of the drive shaft, which would lead to increased wear of the thrust washer of the positive displacement oil pump.

In contrast, according to the compressor 1 of the present disclosure, since the thrust surface of the shaft assembly 10 is provided by the second body 200, and the end face machining of the second body 200 can be performed more easily, the required roughness, flatness, and the like of the end face of the second body 200 can be ensured more easily, whereby the risk of wear due to poor quality of the end face machining can be reduced.

In a preferred embodiment, the second body 200 is a split component mounted on the first body 100. Since the end face machining of the split-type second body (e.g., bushing) is more easily ensured, in case of employing the positive displacement oil pump, the compressor according to the present disclosure can obtain a very significant machining advantage compared to the compressor according to the related art, especially in case of the split-type design of the first body 10 and the second body 20. Further, in the case where the second body 200 is a separate member mounted on the first body 100, even after the thrust surface 201 is worn, only the second body 200 may be reworked or only the second body 200 may be replaced. Therefore, the shaft assembly 10 can be easily repaired.

In a preferred embodiment, the second body 200 may be made of Vespel resin having high wear resistance. In this regard, the inventors have discovered that by selecting Vespel resin as the material from which the second body is made, particularly in certain applications (e.g., applications where the second body is in contact with a thrust washer of an oil pump as a sleeve for a drive shaft of a scroll compressor), significant wear resistance can be achieved, while the use of Vespel resin also ensures easy formation of the second body and a secure fit with the first body. In an experiment carried out by the inventors, Vespel resin was chosen as the material of which the second body is made so that the limit value of the unlubricated pv of the mechanical seal between the second body and the counterpart is as high as 10.4Mpa · m/s, whereas the unlubricated pv limit value of PTFE in contrast thereto is only 1Mpa · m/s.

According to an exemplary embodiment, the second body 200 may have higher wear resistance than the first body 100. In this way, by providing the axial thrust surface of the shaft assembly 10 by the second body 200 having high wear resistance, the friction between the shaft assembly 10 of the compressor 1 and the surfaces in contact therewith, such as the thrust washer 30, can be reduced, and the wear of the contact surfaces can be reduced.

According to an exemplary embodiment, the second body 200 may be fixedly or clearance-fittingly mounted with the first body 100.

In some embodiments, in order to ensure integral rotation between the second body 200 and the first body 100, the shaft assembly 10 may be provided with a limiting device capable of limiting the rotation of the second body 200 with respect to the first body 100. It should be understood that the configuration of the limiting means should not be limited in any way as long as it can be configured to limit the circumferential relative movement of the second body 200 and the first body 100. The structure of the spacing device will now be described by way of example.

In some embodiments, as shown in fig. 3 and 4, the first body 100 may include an axle stub 110, and the second body 200 may be a sleeve mounted around the axle stub 110. In some embodiments, the spacing device may include a first positioning portion 1110 provided on the stub shaft 110 of the first body 100 and a second positioning portion 2110 provided on the second body 200 (bushing). In the illustrated embodiment, the first positioning portion 1110 is provided on the outer peripheral wall of the first body 100 (on the outer peripheral wall of the stub shaft), and the second positioning portion 2110 is provided on the inner peripheral wall of the second body 200 (sleeve).

According to an exemplary embodiment, the first and

second positioning parts

1110 and 2110 may be flat surfaces or concave and convex surfaces matched in shape. In the illustrated embodiment, the first locating portion 1110 is a first flat (spade) provided on the outer peripheral wall of the stub shaft 110, and the second locating portion 2110 is a second flat (spade) provided on the inner peripheral wall of the boss that matches the first flat in shape. The torque is transmitted in a flat manner, so that the sleeve can be reliably rotated together with the first body of the drive shaft when the first body of the drive shaft is in clearance fit with the sleeve. However, it is conceivable that the first positioning portion 1110 and the second positioning portion 2110 are configured in other manners. For example, according to an exemplary embodiment, the first positioning part 1110 may be a recess provided on the outer circumferential wall of the stub shaft 110, and the second positioning part 2110 may be a protrusion provided on the inner circumferential wall of the boss to match the shape of the recess. It will be appreciated that the opposite arrangement is also possible, i.e. the first locating portion 1110 may be a protrusion provided on the outer peripheral wall of the stub shaft 110 and the second locating portion 2110 may be a recess provided on the inner peripheral wall of the sleeve matching the shape of the protrusion. Other configurations than such a concavo-convex fitting are conceivable, for example, the first positioning portion 1110 may be an externally threaded portion provided on the outer peripheral wall of the stub shaft 110, and the second positioning portion 2110 may be an internally threaded portion provided on the inner peripheral wall of the boss in match with the externally threaded portion.

Although in the above described embodiment the first body 100 has an axle stub 110 and the second body 200 is mounted about the axle stub 110, it should be understood that the scope of the present disclosure is not so limited. For example, although not shown, the second body 200 may be provided to be mounted on an axial end face of the first body 100 via an axial end face thereof. In this case, the stopper may include a first positioning portion 1110 provided on an axial end surface of the first body 100 and a second positioning portion 2110 provided on an axial end surface of the second body 200. In an exemplary embodiment, the first and

second positioning portions

1110 and 2110 may be flat surfaces or concave and convex surfaces matched in shape. In an exemplary embodiment, the stopper may include a welded portion, an adhered portion, a press-fit portion, or the like provided between the axial end surface of the first body 100 and the second body 200.

In addition, although in the preferred embodiment described above, the second body 200 is a split-type component mounted on the first body 100, it should be understood that the second body 200 is an integral-type component provided on the first body 100 without departing from the spirit and scope of the present disclosure. For example, the first body 100 may include the stub shaft 110, and the second body 200 may be integrally formed on the stub shaft 110 by injection molding or the like. It is noted that, in this case, the second body 200 may be formed of a high wear-resistant material capable of injection molding. In this case, for example, the second body 200 may be made of vespel resin. In addition, it is also conceivable that the second body 200 may be formed of another metal material of high wear resistance capable of being cast-molded.

In addition, the present disclosure also provides a compressor 1, which compressor 1 comprises the shaft assembly 10 as described above. The compressor provided thereby can solve the problems in the compressor according to the related art, and can also obtain the advantageous technical effects as described above.

In this disclosure, the use of directional terms such as "upper" and "lower" is for convenience of description only and should not be taken as limiting. Furthermore, while the present disclosure has been described with reference to exemplary embodiments, it is to be understood that the disclosure is not limited to the specific embodiments described and illustrated in detail herein. Various modifications may be made to the exemplary embodiments by those skilled in the art without departing from the scope of the disclosure as defined in the claims.

Features mentioned and/or shown in the above description of exemplary embodiments of the disclosure may be combined in the same or similar manner in one or more other embodiments, in combination with or instead of the corresponding features in the other embodiments. Such combined or substituted embodiments should also be considered as included within the scope of the present disclosure.

Claims

1. A shaft assembly for a compressor, the shaft assembly comprising a first body and a second body arranged to rotate integrally with the first body, the second body providing an axial thrust surface of the shaft assembly which contacts a corresponding component of the compressor.

2. The shaft assembly of claim 1,

the second body is mounted on the axial end face of the first body via the axial end face thereof, or

The first body includes a stub shaft and the second body is a sleeve mounted around the stub shaft.

3. The shaft assembly of claim 2, wherein the second body is fixedly or clearance-fittingly mounted with the first body.

4. The shaft assembly of claim 2, wherein the shaft assembly is provided with a stop device that prevents rotation of the second body relative to the first body.

5. The shaft assembly of claim 4,

in a case where the second body is mounted on an axial end surface of the first body via an axial end surface thereof, the stopper device includes a first positioning portion provided on the axial end surface of the first body and a second positioning portion provided on the axial end surface of the second body;

under the condition that the first body comprises a shaft head and the second body is a shaft sleeve installed around the shaft head, the limiting device comprises a first positioning part arranged on the outer peripheral wall of the shaft head and a second positioning part arranged on the inner peripheral wall of the shaft sleeve.

6. The shaft assembly of claim 5,

the first positioning part and the second positioning part are planes or concave-convex surfaces matched in shape.

7. The shaft assembly of any of claims 1-6, wherein the second body has a higher wear resistance than the first body.

8. The shaft assembly of any one of claims 1 to 6, wherein the second body is a component made of Vespel resin.

9. A compressor, characterized in that it comprises a shaft assembly according to any one of claims 1 to 8.

10. The compressor of claim 9, wherein the shaft head of the shaft assembly is an eccentric shaft head, the compressor includes an oil pump driven by the eccentric shaft head of the shaft assembly, and the counterpart member is a thrust washer of the oil pump in contact with the axial thrust surface.