CN219774350U - Drive shaft of scroll compressor and scroll compressor comprising same - Google Patents
Drive shaft of scroll compressor and scroll compressor comprising same Download PDFInfo
- Publication number
- CN219774350U CN219774350U CN202320161017.XU CN202320161017U CN219774350U CN 219774350 U CN219774350 U CN 219774350U CN 202320161017 U CN202320161017 U CN 202320161017U CN 219774350 U CN219774350 U CN 219774350U
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- Prior art keywords
- drive shaft
- drive
- scroll
- scroll compressor
- orbiting scroll
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- 238000005096 rolling process Methods 0.000 claims abstract description 42
- 230000004323 axial length Effects 0.000 claims description 15
- 238000003754 machining Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The present utility model relates to a drive shaft of a scroll compressor and a scroll compressor including the same. The scroll compressor includes a scroll assembly including a non-orbiting scroll and an orbiting scroll forming a sealed chamber therebetween, the orbiting scroll including a hub, a drive shaft including a body and a deflection head including a drive end extending from the body, the drive end adapted to be disposed in the hub to drive the orbiting scroll relative to the non-orbiting scroll, the deflection head including a circumferentially extending projection at an outer periphery of the drive end. According to the present utility model, in the case where the orbiting scroll is swung, when a portion of the driving bearing fixedly connected to the orbiting scroll is also swung, the portion allowed to be in contact with the deflection head can also be adaptively deflected, thereby allowing the inner race and the outer race of the rolling bearing to remain substantially parallel to avoid seizing of the bearing and/or avoiding excessive wear between the deflection head and the portion contacted by the deflection head.
Description
Technical Field
The present utility model relates to the field of compressors, and more particularly, to a drive shaft for a scroll compressor, and to a scroll compressor including the drive shaft.
Background
This section provides background information related to the present disclosure, which is not necessarily prior art.
Scroll compressors are machines that perform cooling or heating by compressing a refrigerant. The scroll assembly serves as a core in a scroll compressor for compressing a refrigerant. The scroll assembly includes a fixed scroll and an orbiting scroll forming a sealed chamber therebetween, the orbiting scroll orbiting the fixed scroll such that the volume of the sealed chamber is constantly changed to create suction, compression and discharge processes.
The orbiting scroll is driven by a motor in the scroll compressor via an eccentric shaft. The deflection head at the top end of the eccentric shaft rotates along with the rotation of the eccentric shaft so as to provide driving force to drive the movable vortex piece to rotate, thereby realizing the compression of the refrigerant.
In the related art, the deflection head of the eccentric shaft drives the orbiting scroll member optionally via an unloading bushing and rolling bearings (e.g., roller bearings, ball bearings). The unloader bushing may be fixedly engaged with an inner race of a rolling bearing, and an outer race of the rolling bearing may be fixedly engaged with the orbiting scroll (specifically, a hub portion of the orbiting scroll). During operation of the compressor, the orbiting scroll may wobble. When the movable vortex piece shakes, the outer ring of the rolling bearing can be driven to shake and deflect together, so that the outer ring and the inner ring of the rolling bearing are not parallel, and the bearing is blocked, and meanwhile, excessive abrasion between the deflection head and the unloading bushing and/or between the deflection head and the inner ring of the bearing can be caused by shaking of the movable vortex piece. In addition, the eccentric shaft (in particular the deflection head of the eccentric shaft) may also be jammed by deformation under stress. Furthermore, problems with the bearing/unloading bushing or the deflector head during machining (such as machining dimensional errors) may also result in seizing when these parts are mated to one another under certain harsh conditions.
Further, in the related art, the eccentric shaft is used to transmit the driving force, which is in contact with the unloading bushing, and thus, even in the case where the orbiting scroll is particularly wobbled, there is a certain friction loss during the transmission of the driving force, so that the wear of the contact surface is easily caused. In particular, in the case of insufficient lubrication, wear tends to be serious.
In addition, in the related art eccentric shaft (driving shaft), an additional shaft hole for oil supply is also provided and the deflection head is made together with the body of the eccentric shaft or fixedly connected via an additional fixing member. The eccentric shaft has the advantages of complex structure, complex processing technology and high processing precision requirement, thereby having large processing difficulty and high processing cost.
Disclosure of Invention
This section provides a general summary of the disclosure, rather than a comprehensive disclosure of its full scope or all of its features, and the description in this section is for purposes of illustration only and is not intended to limit the scope of the disclosure.
It is an object of the present utility model to provide a drive shaft for a scroll compressor which overcomes or mitigates at least one of the above-mentioned disadvantages of the related art.
In particular, it is an object of the present utility model to provide a drive shaft of a scroll compressor which is capable of avoiding seizing of the drive bearing (in particular, rolling bearing) due to wobble of the orbiting scroll, forced deformation of the drive shaft and/or dimensional errors of the parts machined.
Furthermore, it is an object of the present utility model to provide a drive shaft of a scroll compressor which is capable of avoiding excessive wear between the drive shaft (in particular, the deflection head) and the parts (in particular, the unloading bushing) with which it cooperates.
In addition, the utility model also aims to provide a driving shaft of the scroll compressor, which can simplify the structure, simplify the processing technology and reduce the processing precision requirement.
In one aspect, the present utility model is directed to a drive shaft for a scroll compressor including a scroll assembly including a non-orbiting scroll and an orbiting scroll forming a sealed chamber therebetween, the orbiting scroll including a hub, the drive shaft including a body and a deflection head including a drive end extending from the body, the drive end being adapted to be disposed in the hub to drive the orbiting scroll about the non-orbiting scroll, the deflection head including a circumferentially extending projection at an outer periphery of the drive end.
In some forms, the protrusion is a protruding cylindrical region located at an axially intermediate portion of the drive end. By providing a protruding cylindrical region there, it is possible to help avoid seizing of the drive bearing, excessive wear between the drive shaft and the parts with which it cooperates.
In some forms, the axial length of the protruding cylindrical region is 3mm to 7mm, preferably 5mm, and/or the ratio of the axial length of the protruding cylindrical region to the total axial length of the drive end is 3/10 to 7/10. The inventors have found that using the above values or ranges of values, the drive shaft works more smoothly while reducing wear. In particular, since the ratio of the axial length of the protruding cylindrical region to the total axial length of the drive end is 3/10 to 7/10, it is possible to ensure that the center (axial center position) of the protruding portion is directly opposite to the center (axial center position) of the drive bearing.
In some forms, the protrusion is a drum-shaped protrusion. By thus providing the shape of the protruding portion, seizing of the drive bearing can be effectively avoided, and excessive wear between the drive shaft and the component with which it is fitted can be avoided.
In some forms, the crowning is provided over the entire axial length of the drive end or only at an axially intermediate portion of the drive end.
In some forms, the body is machined separately from the deflection head. By the processing mode, the structure can be simplified, the processing technology can be simplified, and the processing precision requirement can be reduced.
In some forms, a fixed aperture is provided at an end face of the body, the deflection head comprising a first end and a second end serving as a driving end, the first end being fixed in the fixed aperture.
In some forms, the deflection head is generally cylindrical and the first end is secured directly in the fixation hole with interference.
In another aspect, the present utility model is directed to a scroll compressor. The scroll compressor includes a drive shaft as described above.
In some forms, the scroll compressor further includes a rolling bearing disposed between the hub and the drive end, the axial center position of the projection being generally aligned with the axial center position of the rolling bearing, and/or the longitudinal center axis of the projection being aligned with the longitudinal center axis of the rolling bearing.
In some forms, the scroll compressor further includes an unloading bushing disposed between the rolling bearing and the drive end.
In some forms, the rolling bearing includes an inner ring and an outer ring, the inner ring being in interference connection with the relief bushing, the outer ring being in interference connection with the hub.
According to the present utility model, in the case where the orbiting scroll is swung, when a portion of the rolling bearing fixedly connected to the orbiting scroll (for example, an outer ring of the rolling bearing) is also swung, a bush and/or a portion of the rolling bearing (for example, an inner ring of the rolling bearing) which are allowed to be in contact with the deflection head can also be adaptively deflected, thereby allowing the inner ring of the rolling bearing to remain substantially parallel to the outer ring while avoiding seizing of the rolling bearing, and/or avoiding excessive wear between the deflection head and the bush and/or the inner ring of the rolling bearing.
Further areas of applicability of the present utility model will become apparent from the description provided herein.
Drawings
The drawings described herein are for illustration purposes only of selected embodiments and not all possible embodiments and are not intended to limit the scope of the present disclosure. In the drawings:
FIG. 1 illustrates a longitudinal cross-sectional view of a drive shaft and cooperating components in a scroll compressor in accordance with a first embodiment of the present utility model;
fig. 2 shows a perspective view of a deflection head of a drive shaft according to a first embodiment of the utility model; and
fig. 3 shows a perspective view of a deflection head of a drive shaft according to a second embodiment of the utility model.
In the drawings, corresponding reference numerals indicate corresponding parts.
Detailed Description
Exemplary embodiments will now be described more fully with reference to the accompanying drawings.
Fig. 1 shows a longitudinal section of a drive shaft and its cooperating parts in a scroll compressor according to a first embodiment of the utility model. The scroll compressor includes a scroll assembly for compressing a refrigerant. The scroll assembly includes a fixed scroll (not shown) and an orbiting scroll 10, a sealed chamber (not shown) is formed between the fixed scroll and the orbiting scroll 10, and the orbiting scroll 10 orbits around the fixed scroll such that the volume of the sealed chamber is continuously changed, thereby generating suction, compression and discharge processes.
In some scroll compressors, the orbiting scroll 10 includes a hub 12. The scroll compressor includes a rolling bearing 14 (e.g., roller bearing, ball bearing) located inside the hub 12. Those skilled in the art will appreciate that other bearings, such as plain bearings, can be employed instead of the rolling bearing 14. The rolling bearing 14 includes an inner race 15 and an outer race 16. Additionally, the orbiting scroll 10 includes a bushing 17 (particularly, an unloading bushing) located inside the rolling bearing 14, the bushing 17 being connected with an inner ring 15 of the rolling bearing 14 in an interference fit, and an outer ring 16 of the rolling bearing 14 being connected with the hub 12 of the orbiting scroll 10 in an interference fit.
The scroll compressor also includes a drive shaft 20. The orbiting scroll 10 is driven by a motor 30 of the scroll compressor via a drive shaft 20.
The drive shaft 20 includes a body 21 and a deflection head 22.
In the embodiment shown in fig. 1, the deflection head 22 includes a drive end 24 extending from the body 21, the drive end 24 being adapted to be disposed in the hub 12 to drive the orbiting scroll member 10 about the fixed scroll member. The rolling bearing 14 is arranged between the hub 12 and the drive end 24. In some embodiments, the bushing 17 is disposed between the rolling bearing 14 and the drive end 24 of the deflection head 22, the bushing 17 being rotatable relative to the deflection head 22.
Fig. 2 shows a perspective view of the deflection head of the drive shaft according to the first embodiment of the utility model. The deflector head 22 comprises a circumferentially extending protrusion 25 at the outer periphery of the drive end 24. As shown in fig. 1, the central axis of the protruding portion 25 is offset with respect to the central axis of the body 21 of the drive shaft 20.
As shown in fig. 2, according to the first embodiment of the present utility model, the protruding portion 25 of the deflection head 22 is a protruding cylindrical region located at an axially intermediate portion of the driving end 24.
As indicated by a dot-dash line O in fig. 1, the axial center position of the protrusion 25 is aligned with the axial center position of the rolling bearing 14 (e.g., the outer ring 16) (i.e., with the orbiting center of the orbiting scroll 10). And/or the longitudinal central axis of the projection 25 is aligned with the longitudinal central axis of the rolling bearing 14. Thereby, a good fit of the deflection head 22 with the rolling bearing 14 is ensured.
The axial length of the projection 25, i.e. the projecting cylindrical region, may be 3mm to 7mm, in particular may be 5mm, and/or the ratio of the axial length of the projecting cylindrical region to the total axial length of the drive end 24 may be 3/10 to 7/10. Those skilled in the art will appreciate that other values for the axial length of the projection 25 are possible.
Fig. 3 shows a perspective view of a deflection head of a drive shaft according to a second embodiment of the utility model. In the second embodiment shown in fig. 3, the projection 25 'of the deflection head 22' is a drum-shaped projection. This can suitably accommodate the rattling of the orbiting scroll 10.
As shown in fig. 3, the protrusion 25 'of the deflection head 22' is provided over the entire axial length of the driving end 24 'of the deflection head 22' or only at an axially intermediate portion of the driving end 24 'of the deflection head 22'.
According to the present utility model, in the case where the orbiting scroll is swung, when a portion of the rolling bearing fixedly connected to the orbiting scroll (for example, an outer ring of the rolling bearing) is also swung, a bush and/or a portion of the rolling bearing (for example, an inner ring of the rolling bearing) which are allowed to be in contact with the deflection head can also be adaptively deflected, thereby allowing the inner ring of the rolling bearing to remain substantially parallel to the outer ring while avoiding seizing of the rolling bearing, and/or avoiding excessive wear between the deflection head and the bush and/or the inner ring of the rolling bearing.
Returning to fig. 1, the body 21 of the drive shaft 20 is machined separately from the deflection head 22. In particular, the deflection head 22 is a cylindrical pin. A fixing hole is provided at an end face of the body 21 of the drive shaft 20, particularly, an end face facing the scroll assembly. The deflection head 22 includes a first end 23 and a second end serving as a drive end 24. The first end 23 of the deflector head 22 is fixed in the fixed aperture. By using this split machining method, the process of the driving shaft 20 is simple, thereby saving the machining cost. Those skilled in the art will appreciate that the body 21 of the drive shaft 20 and the deflection head 22 can also be integrally formed.
In particular, the deflector head 22 has a substantially cylindrical shape and the first end 23 is directly fixed in the fixing hole of the body 21 of the drive shaft 20 with interference. In this way, no additional connection is required, so that the machining process of the drive shaft 20 is simple and the structure is simple.
The foregoing description of the embodiments has been presented for purposes of illustration and description. These descriptions are not intended to be exhaustive or limiting of the disclosure. The individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in other embodiments even if not specifically shown or described. The individual elements or features of a particular embodiment may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Claims (12)
1. A drive shaft for a scroll compressor, the scroll compressor comprising a scroll assembly including a non-orbiting scroll and an orbiting scroll forming a sealed chamber therebetween, the orbiting scroll including a hub, the drive shaft including a body and a deflection head including a drive end extending from the body, the drive end being adapted to be disposed in the hub to drive the orbiting scroll about the non-orbiting scroll, characterized in that the deflection head includes a circumferentially extending projection at an outer periphery of the drive end.
2. The drive shaft of claim 1, wherein the projection is a protruding cylindrical region located at an axially intermediate portion of the drive end.
3. The drive shaft according to claim 2, characterized in that the axial length of the protruding cylindrical region is 3 to 7mm and/or the ratio of the axial length of the protruding cylindrical region to the total axial length of the drive end is 3/10 to 7/10.
4. The drive shaft of claim 1, wherein the projection is a drum-shaped boss.
5. The drive shaft of claim 4, wherein the crowning is disposed over the entire axial length of the drive end or only at an axially intermediate portion of the drive end.
6. The drive shaft according to any one of claims 1 to 5, wherein the body is machined separately from the deflection head.
7. The drive shaft according to claim 6, wherein a fixing hole is provided at an end face of the body, the deflection head including a first end portion and a second end portion serving as the drive end portion, the first end portion being fixed in the fixing hole.
8. The drive shaft of claim 7, wherein the deflection head is generally cylindrical and the first end is secured directly in the securing bore with interference.
9. A scroll compressor comprising the drive shaft of any one of claims 1 to 8.
10. The scroll compressor of claim 9, wherein:
the scroll compressor further includes a rolling bearing disposed between the hub and the drive end,
the axial center position of the protrusion is substantially aligned with the axial center position of the rolling bearing, and/or the longitudinal center axis of the protrusion is aligned with the longitudinal center axis of the rolling bearing.
11. The scroll compressor of claim 10, further comprising an unloading bushing disposed between the rolling bearing and the drive end.
12. The scroll compressor of claim 11, wherein the rolling bearing comprises an inner ring and an outer ring, the inner ring being in interference connection with the unloader bushing and the outer ring being in interference connection with the hub.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320161017.XU CN219774350U (en) | 2023-02-07 | 2023-02-07 | Drive shaft of scroll compressor and scroll compressor comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320161017.XU CN219774350U (en) | 2023-02-07 | 2023-02-07 | Drive shaft of scroll compressor and scroll compressor comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219774350U true CN219774350U (en) | 2023-09-29 |
Family
ID=88138477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320161017.XU Active CN219774350U (en) | 2023-02-07 | 2023-02-07 | Drive shaft of scroll compressor and scroll compressor comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219774350U (en) |
-
2023
- 2023-02-07 CN CN202320161017.XU patent/CN219774350U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |