CN216842196U - Scroll compressor having a plurality of scroll members - Google Patents

Abstract

The utility model relates to a scroll compressor, scroll compressor includes: a compression mechanism including an orbiting scroll having an end plate and a hub extending from the end plate, the end plate having an inner side end plate surface located inside the hub; a driving shaft provided with an eccentric pin inserted into the hub part to drive the orbiting scroll; and a bushing disposed between the eccentric pin and the hub, wherein a limiting mechanism is provided at a surface of the inner side end plate, the limiting mechanism including a limiting portion and a recess, the limiting mechanism configured to: when the bush moves to abut against the limit portion, the lubricating oil flows through the recess. According to the utility model discloses a limiting mechanism on the inboard terminal plate surface of scroll compressor's movable vortex can improve the lubricated effect to the surface of bush.

Description

Scroll compressor having a plurality of scroll members

Technical Field

The utility model relates to a compressor field, in particular, relates to the stop gear to scroll compressor's bush makes modified scroll compressor.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

A scroll compressor generally has a compression mechanism that compresses a working fluid (e.g., refrigerant) including a fixed scroll and an orbiting scroll, and is driven by an eccentric pin of a driving shaft. A bushing may be provided between the eccentric pin and the orbiting scroll to perform a driving function or the like. For example, an unloading bushing may be provided between the eccentric pin of the drive shaft and the orbiting scroll to additionally achieve radial flexibility. The unloading bushing is arranged to be drivable by the eccentric pin and to be capable of radial relative displacement with respect to the eccentric pin under certain circumstances, whereby radial flexibility of the compression mechanism (in particular of the orbiting scroll member) can be achieved. Therefore, on one hand, the machining and installation accuracy of the compression mechanism can be reduced, and on the other hand, when impurities or liquid enters a compression cavity of the compression mechanism, the fixed scroll and the movable scroll can be allowed to be separated radially, so that the compression mechanism is prevented from being damaged due to the fact that the fixed scroll and the movable scroll bear overlarge loads.

However, when the scroll compressor is in a particular operating condition, such as a high speed, heavy duty condition, the eccentric pin of the drive shaft may tilt, which when the angle of tilt of the eccentric pin is greater than the angle of tilt of the hub of the orbiting scroll, will cause the unloader bush to move upward relative to the orbiting scroll and engage the inside end plate surface inside the hub of the orbiting scroll. In such a case, the contact of the top of the unloader bushing with the inner end plate surface may block the flow of lubrication oil onto the outer surface of the unloader bushing, thus starving the outer surface of the unloader bushing for lubrication, resulting in severe wear of the outer surface of the unloader bushing and the corresponding contact surface of the corresponding member (e.g., the inner surface of the drive bearing), thereby affecting the performance and reliability of the scroll compressor and reducing the service life of the unloader bushing. It will be appreciated that when the bushing is of another type, there is also the problem of the outer surface of the bushing wearing significantly when the scroll compressor is in a high speed, heavy duty condition.

Accordingly, there is a need for an improved scroll compressor having an improved limit mechanism for limiting the bushing so as to improve the lubrication effect on the outer surface of the bushing.

SUMMERY OF THE UTILITY MODEL

The general outline of the present invention is provided in this section, not a full scope of the present invention or a full disclosure of all the features of the present invention.

The object of the present invention is to solve or alleviate the above mentioned technical problems. For example, an aspect of the present invention may provide a scroll compressor having an improved limit mechanism for limiting a bushing, the limit mechanism being located at least on an inner side end plate surface inside a boss portion of a movable scroll and configured to allow a lubricating oil to flow onto an outer surface of a bushing when the bushing moves upward and touches an inner side end plate surface of the scroll to lubricate the outer surface of the bushing.

In order to solve one or more of the above-mentioned technical problems, according to an aspect of the present invention, there is provided a scroll compressor including: a compression mechanism including an orbiting scroll having an end plate and a hub extending from the end plate, the end plate having an inner side end plate surface located inside the hub; a driving shaft provided with an eccentric pin inserted into the hub part to drive the orbiting scroll; and a bushing disposed between the eccentric pin and the hub, wherein a limiting mechanism is provided at a surface of the inner side end plate, the limiting mechanism including a limiting portion and a recess, the limiting mechanism configured to: when the bush moves to abut against the limit portion, the lubricating oil flows through the recess.

In the above scroll compressor, the stopper mechanism is configured to: when a part of the top of the bush abuts against the stopper, a gap allowing the flow of the lubricating oil exists between the other part of the top of the bush and the recess.

In the above scroll compressor, the stopper portion is configured as a plurality of protrusions spaced apart from each other at an outer periphery of the inner side end plate surface, and the recess portion is configured as a recess portion at a central position of the inner side end plate surface; or the stopper portion is configured as a rib extending in the radial direction of the inner end plate surface, and the recessed portions are configured as two recessed portions in a substantially semicircular shape on both sides of the rib.

In the above scroll compressor, the end plate further has an outboard end plate surface located outside the boss portion, a bottom end surface of the stopper portion is flush with the outboard end plate surface, and the recessed portion is recessed with respect to the outboard end plate surface.

In the above scroll compressor, a notch that allows the lubricating oil to flow therethrough is provided at the top of the bush, and the notch is aligned with the recess in the axial direction.

In the above scroll compressor, the top of the bush is configured such that the remaining portion other than the recess has a flat top surface.

In the above scroll compressor, a stopper structure extending substantially around the base portion is provided at a base portion of the bush opposite the apex portion, the stopper structure being adapted to abut against a tip end of the hub portion to restrict movement of the bush toward the orbiting scroll.

In the above scroll compressor, the stopper structure is implemented as a retainer ring that is separate from the liner and is fitted to the base of the liner by snap-fitting; or the stop structure is realized as a threaded ring which is separate from the bushing and is fitted to the base of the bushing by means of a threaded fastening; or the stop structure is realized as a flange which is integrally formed with the bushing.

In the above scroll compressor, the bushing is an unloading bushing that allows the bushing to move radially with respect to the eccentric pin.

In the above scroll compressor, the scroll compressor further includes a drive bearing provided between the boss portion and the bush.

The scroll compressor according to the present invention has advantages at least as follows, for example. In the scroll compressor according to the utility model discloses an inboard terminal surface that is provided with on the hub inboard of moving the vortex is provided with and is used for carrying out spacing stop gear to the bush, and this stop gear includes spacing portion and concave part for when bush rebound and the spacing portion of butt, can pass through the concave part and there is the clearance that allows lubricating oil to flow to pass through between the top of bush and inboard terminal surface, and on the surface of permission lubricating oil flow to the bush through this clearance, with the good lubrication effect of the surface of assurance bush, thereby prolonged the life of bush.

Drawings

The following figures illustrate technical features of one or more embodiments of the scroll compressor of the present invention and of the prior art, in which:

FIG. 1 is a cross-sectional view of a scroll compressor according to a first embodiment of the present invention;

fig. 2 is a sectional view of an orbiting scroll of a scroll compressor according to a first embodiment of the present invention;

fig. 3 is a vertical view of a driven scroll of an orbiting scroll of a scroll compressor according to a first embodiment of the present invention, viewed from a boss direction;

fig. 4 is a perspective view showing an unloading bush of the scroll compressor according to the first embodiment of the present invention;

fig. 5 is a sectional view showing an orbiting scroll of a scroll compressor equipped with an unloading bush according to a first embodiment of the present invention;

FIG. 6 is an enlarged cross-sectional view illustrating a hub portion of an orbiting scroll of the scroll compressor shown in FIG. 5;

FIG. 7 is a cross-sectional view of an orbiting scroll of a scroll compressor according to a second embodiment of the present invention;

FIG. 8 is a vertical view of an orbiting scroll of a scroll compressor according to a second embodiment of the present invention;

fig. 9 is a sectional view showing an orbiting scroll of a scroll compressor equipped with an unloading bush according to a second embodiment of the present invention;

FIG. 10 is an enlarged cross-sectional view illustrating a hub portion of an orbiting scroll of the scroll compressor shown in FIG. 9;

FIG. 11 is a perspective view of a retainer ring that may be assembled to the unloader bushing;

FIG. 12 is a cross-sectional view showing the orbiting scroll of the scroll compressor fitted with the unloader bushing having the retainer ring shown in FIG. 11;

FIG. 13 is a perspective view of yet another unloader bushing for a scroll compressor according to the present invention;

FIG. 14 is a cross-sectional view showing the orbiting scroll of the scroll compressor fitted with the unloader bushing shown in FIG. 13.

FIG. 15 is a perspective view of yet another unloader bushing for a scroll compressor according to the present invention;

FIG. 16 is a cross-sectional view showing the orbiting scroll of the scroll compressor fitted with the unloader bushing shown in FIG. 15

Detailed Description

The invention is described in detail below with the aid of specific embodiments with reference to the attached drawings. The following detailed description of the invention is merely for purposes of illustration and is in no way intended to limit the invention, its application, or uses.

The utility model provides a scroll compressor, this scroll compressor's the inboard medial extremity terminal plate surface of the hub of the vortex that moves is provided with stop gear on, and this stop gear includes spacing portion and concave part for there is the clearance between the top of bush and stop gear's concave part when bush rebound and the spacing portion of butt, so that lubricating oil can flow on the surface of bush through this clearance, in order to carry out the intensive lubrication to the surface of bush.

Hereinafter, the construction and operation principle of the limit mechanism of the orbiting scroll of the scroll compressor according to various embodiments of the present invention will be described in brief with reference to various views of the accompanying drawings.

Fig. 1 is a sectional view of a scroll compressor according to a first embodiment of the present invention. As shown in fig. 1, a scroll compressor 1 according to the present invention mainly includes a compression mechanism, a main bearing housing, a drive mechanism, and a housing. The compression mechanism includes an orbiting scroll 10 and a non-orbiting scroll. The drive mechanism comprises a motor and a drive shaft 100 provided with an eccentric pin 101. The eccentric pin 101 of the drive shaft 100 is configured to be inserted inside the boss 12 of the orbiting scroll 10, whereby the drive shaft 100 can drive the orbiting scroll 10 to orbit with respect to the non-orbiting scroll through driving engagement of the eccentric pin 101 with the boss 12. A bush may be provided between the orbiting scroll 10 and the eccentric pin 101. For example, in the scroll compressor 1 shown in fig. 1, an unloading bush is provided between the orbiting scroll 10 and the eccentric pin 101, and a drive bearing surrounding the unloading bush is selectively provided radially outside of the unloading bush. The unloader bushing can move radially relative to the eccentric pin to provide radial flexibility to the compression mechanism. When the scroll compressor is in an operating state, the discharge bush will rotate together with the eccentric pin, and the drive bearing will orbit around the fixed scroll together with the orbiting scroll, so that there is relative movement between the discharge bush and the drive bearing, resulting in wear of the outer surface of the discharge bush and the inner surface of the drive bearing, which are in contact with each other. Therefore, an oil passage penetrating the drive shaft is provided in the drive shaft so that the lubricating oil can flow out of the lubricating oil hole at the top of the eccentric pin from the oil sump through the oil passage to sufficiently lubricate the contact surfaces of the unload bush and the drive bearing.

Fig. 2 and 3 are views of an orbiting scroll of a scroll compressor according to a first embodiment of the present invention.

Fig. 2 is a sectional view of an orbiting scroll of a scroll compressor according to a first embodiment of the present invention. As shown in fig. 2, an orbiting scroll 10 of a scroll compressor includes an end plate 11, and a hub portion 12 and a vane portion 13 on opposite surfaces of the end plate 11. The hub portion 12 is located at a central position of the end plate 11 and extends in the axial direction from the end plate 11. The end plate 11 includes an inboard end plate surface 121 inboard of the hub 12 and an outboard end plate surface 124 outboard of the hub 12, and the hub 12 and inboard end plate surface 121 define a hub internal cavity for receiving the eccentric pin of the drive shaft as well as the dump bushing and drive bearing.

Fig. 3 is a vertical view of a driven scroll of an orbiting scroll of a scroll compressor according to a first embodiment of the present invention, viewed from a boss direction. As shown in fig. 3, a stopper mechanism including a stopper portion 123 and a recess 122 is provided on an inner end plate surface 121 of the orbiting scroll 10. The stopper portion 123 is configured as a plurality of protrusions, e.g., four protrusions, spaced apart from each other at the outer periphery of the inner end plate surface 121, and the recess portion 122 is configured at the central position of the inner end plate surface 121. When the stopper portion 123 is configured as four protrusions, the recess 122 may have a substantially cross shape. The bottom end surface 123a of the stopper portion 123 may be configured to be flush with the outboard end plate surface 124, while the recess 122 may be recessed relative to the outboard end plate surface 124 (i.e., recessed inward of the end plate).

Fig. 4 is a perspective view showing an unloading bush of a scroll compressor according to a first embodiment of the present invention. As shown in fig. 4, the unloader bushing 14 is hollow cylindrical, and the unloader bushing 14 can be received in the hub inner cavity and disposed around the eccentric pin between the eccentric pin and the inner circumferential wall of the hub. A recess 15 may optionally be provided in the outer peripheral portion of the top of the unloader bushing to facilitate the flow of lubricant through the recess 15 to the outer peripheral surface of the unloader bushing 14 (i.e., the outer surface of the unloader bushing 14 that contacts the drive bearing).

Fig. 5 and 6 are views of the orbiting scroll of the scroll compressor equipped with the unloading bush according to the first embodiment of the present invention.

Fig. 5 is a sectional view showing a scroll compressor according to a first embodiment of the present invention. As shown in fig. 5, the unloader bushing 14 is received in the hub interior cavity and is disposed around an eccentric pin (not shown) between the eccentric pin and the inner peripheral wall of the hub. Drive bearing 16 may be a collar and is inserted between the inner circumferential wall of the hub interior cavity and the unloader bushing 14 in an interference fit and disposed about the unloader bushing 14. When the scroll compressor is in an operating state, the unloading bush 14 rotates together with the eccentric pin, and the drive bearing 16 orbits around the fixed scroll together with the orbiting scroll, so there is relative movement between the unloading bush 14 and the drive bearing 16, resulting in wear of the contact surfaces of the unloading bush 14 and the drive bearing 16. Thus, it is desirable that the lubricating oil flow between the contacting surfaces of the unloader bushing 14 and the drive bearing 16 to adequately lubricate them, thereby ensuring the radial compliance of the scroll compressor compression mechanism and the long life of the unloader bushing and drive bearing.

Fig. 6 is an enlarged sectional view illustrating a hub portion of an orbiting scroll of the scroll compressor shown in fig. 5. When the scroll compressor is in operation, particularly at high speed, heavy duty conditions, the eccentric pin (not shown) of the drive shaft may tilt, causing the unloader bush 14 to move upwardly relative to the orbiting scroll such that its tip contacts the inboard end plate surface 121 of the orbiting scroll 10. Since the stopper mechanism on the inner end plate surface 121 includes the stopper portion 123 and the cross-shaped recess 122, a part of the top of the unloader bush 14 will abut on the stopper portion 123 and cannot move further upward to abut the recess 122. In this case, there will be a gap between another portion of the top of the unloader bushing 14 and the recess 122 of the inner end plate surface 121 so that the lubricating oil flowing out of the lubricating oil hole of the eccentric pin can flow through the gap to between the unloader bushing 14 and the drive bearing 16 to ensure that the lubricating oil can sufficiently lubricate the contact surfaces of the unloader bushing 14 and the drive bearing 16. And in particular the recess 15 (not shown) of the unloader bushing 14 can be axially aligned with the recess 122 to more reliably ensure the presence of the gap and to ensure that the gap has a greater flow area to facilitate a smoother flow of lubricant through the gap between the unloader bushing 14 and the drive bearing 16. Also, the top of the unloading bush 14 may be configured to have a flat top surface except for the recess 15, in this way, there is no need to provide any additional protrusion or protrusion for a stopper at the top of the unloading bush 14 to simplify the structure of the unloading bush 14.

Advantageous effects brought about by the scroll compressor according to the first embodiment of the present invention will be described below. Since the limiting mechanism is arranged on the surface of the inner side end plate on the inner side of the hub of the movable scroll, even if the unloading bushing moves upwards to abut against the surface of the inner side end plate in the operation process of the scroll compressor, the top of the unloading bushing only abuts against the limiting part of the limiting mechanism and cannot move upwards continuously to abut against the concave part of the limiting mechanism, so that a gap exists between the top of the unloading bushing and the concave part of the limiting mechanism to allow lubricating oil to flow between the unloading bushing and the driving bearing to fully lubricate the contact surfaces of the unloading bushing and the driving bearing, good lubricating effect on the contact surfaces between the unloading bushing and the driving bearing is ensured, the radial flexibility performance of the compression mechanism is enhanced, and the service lives of the unloading bushing and the driving bearing are prolonged. In addition, the bottom end surface of the limiting part of the limiting mechanism is flush with the outer side end plate surface on the outer side of the hub, and the concave part is concave towards the inner side of the end plate, so that the limiting mechanism is arranged without adding materials, the larger volume of the inner cavity of the hub is ensured, and the inner side end plate surface does not bear larger load, so that the strength of the end plate is not greatly influenced.

Fig. 7 and 8 are views of an orbiting scroll of a scroll compressor according to a second embodiment of the present invention.

Fig. 7 is a sectional view of an orbiting scroll of a scroll compressor according to a second embodiment of the present invention. As shown in fig. 2, an orbiting scroll 20 of the scroll compressor includes an end plate 21, and a hub portion 22 and a vane portion 23 on opposite surfaces of the end plate 21. The hub 22 is located at a central position of the end plate 21 and extends in the axial direction from the end plate 21. The end plate 21 further comprises an inboard end plate surface 221 located inboard of the hub 22 and an outboard end plate surface 225 located outboard of the hub 22, and the hub 22 and inboard end plate surface 221 define a hub internal cavity for receiving the eccentric pin of the drive shaft and the dump bushing and drive bearing.

Fig. 8 is a vertical view of a driven scroll of a scroll compressor according to a second embodiment of the present invention, viewed from a hub direction. As shown in fig. 8, a stopper mechanism is provided on the inner end plate surface 221 of the orbiting scroll 20. The stopper mechanism includes a convex rib 224 (corresponding to a stopper portion) extending in a radial direction of the inner end plate surface 221 and two concave portions 222 and 223 of a substantially semicircular shape on both sides of the convex rib 224, wherein the convex rib 224 protrudes with respect to the two concave portions 222 and 223. The bottom end surface 224a of the rib 224 may be configured to be flush with the outboard end plate surface 225, while the recesses 222 and 223 may be recessed relative to the outboard end plate surface 225 (i.e., recessed inward of the end plate).

Fig. 9 and 10 are views of an orbiting scroll of a scroll compressor equipped with an unloading bush according to a second embodiment of the present invention.

Fig. 9 is a sectional view showing an orbiting scroll of a scroll compressor according to a second embodiment of the present invention. It is noted that the unloader bushing of the scroll compressor of the second embodiment may be identical to the unloader bushing of the scroll compressor of the first embodiment and therefore will not be described in detail. As shown in fig. 9, the unloader bushing 24 is received in the hub inner cavity of the orbiting scroll 20 and is disposed between the eccentric pin (not shown) and the inner circumferential wall of the hub 22 in a manner surrounding the eccentric pin. The drive bearing 25 may be a collar and is inserted between the hub 22 and the unloader bushing 24 in an interference fit.

Fig. 10 is an enlarged sectional view illustrating a hub portion of an orbiting scroll of the scroll compressor shown in fig. 9. When the scroll compressor is in operation, the eccentric pin (not shown) of the drive shaft may tilt causing the unloader bush 24 to move upwardly relative to the orbiting scroll and abut against the rib 224 on the inboard end plate surface 221 of the orbiting scroll 20. Since the rib 224 protrudes relative to the recesses 222 and 223, the unloader bushing 24 will be blocked by the rib 224 from moving further upward to contact the recesses 222 and 223. In this case, there will be a gap between the top of the unloader bushing 24 and the recesses 222 and 223 of the inner end plate surface 221 so that the lubricating oil flowing out from the lubricating oil hole of the eccentric pin can flow through the gap to between the unloader bushing 24 and the drive bearing 25 to ensure that the lubricating oil sufficiently lubricates the contact surfaces of the unloader bushing 24 and the drive bearing 25.

The scroll compressor according to the second embodiment can also obtain similar technical effects to those of the scroll compressor according to the first embodiment, that is, when the unloading bush moves upward, it first abuts against the convex rib of the stopper mechanism on the inner end plate surface of the movable scroll and cannot move further upward, thereby allowing a gap between the top of the unloading bush and the concave portion of the stopper mechanism on the inner end plate surface to allow lubricating oil to flow between the unloading bush and the drive bearing through the gap to sufficiently lubricate their contact surfaces.

Fig. 11-16 show three other unloading bushings that are structurally different from the unloading bushing previously described, each of which is provided with a stop structure on a base opposite the tip that extends substantially around the base to prevent upward axial movement of the unloading bushing relative to the orbiting scroll, thereby preventing upward movement of the unloading bushing against the inner end plate surface of the orbiting scroll so as not to block the flow of lubricating oil onto the outer peripheral surface of the unloading bushing. And, these three kinds of uninstallation bush all can be assembled in the movable scroll of the scroll compressor according to the above-mentioned embodiment of the present invention.

Fig. 11 is a perspective view of a retainer ring that may be assembled to the unloader bushing. As shown in fig. 11, the collar 31 is separate from the unloader bushing and is substantially annular and can be fitted to the base in a manner that extends substantially around the base of the unloader bushing (not shown) to act as a stop. A groove may be provided on the base of the unloader bush and the retainer ring 31 may be inserted into the groove by snap-fitting to fit onto the base of the unloader bush.

FIG. 12 is a sectional view showing an orbiting scroll of the scroll compressor fitted with the unloader bushing having the retainer ring shown in FIG. 11. As shown in fig. 12, when the unloader bush 30 is fitted into the inner cavity of the hub of the orbiting scroll, the check ring 31 provided substantially around the base of the unloader bush 30 will abut the tip of the hub of the orbiting scroll, so that the unloader bush 30 cannot move toward the orbiting scroll and thus cannot abut the inner end plate surface of the orbiting scroll.

Fig. 13 is a perspective view of an unloading bush of still another scroll compressor according to the present invention. As shown in fig. 13, the unloader bushing 40 is hollow cylindrical, and a threaded ring 41 that serves as a stopper and extends around the base is provided on the base of the unloader bushing 40. The threaded ring 41 and the unloading bushing 40 may be separate. On the inner wall of the threaded ring 41 and on the outer surface of the base of the unloading bushing 40, there are provided threads that cooperate with each other, so that the threaded ring 41 can be fitted onto the base of the unloading bushing 40 by means of threaded fastening.

FIG. 14 is a cross-sectional view showing the orbiting scroll of the scroll compressor fitted with the unloader bushing shown in FIG. 13. As shown in fig. 14, when the unloader bushing 40 is fitted into the inner cavity of the hub of the orbiting scroll, the threaded ring 41 fixed around the base of the unloader bushing 40 will abut the tip of the hub of the orbiting scroll, so that the unloader bushing 40 cannot move toward the orbiting scroll and thus cannot abut the inner end plate surface of the orbiting scroll.

Fig. 15 is a perspective view of an unloading bush of still another scroll compressor according to the present invention. As shown in fig. 15, the unloader bushing 50 has a hollow cylindrical shape, and a flange 51 serving as a stopper extending substantially around the base is provided on the base of the unloader bushing 50. The flange 51 and the unloader bushing 50 can be integral.

FIG. 16 is a cross-sectional view showing the orbiting scroll of the scroll compressor fitted with the unloader bushing shown in FIG. 15. As shown in fig. 16, when the unloader bushing 50 is fitted into the inner cavity of the hub of the orbiting scroll, the flange 51 provided substantially around the base of the unloader bushing 50 will abut the tip of the hub of the orbiting scroll, so that the unloader bushing 50 cannot move toward the orbiting scroll and thus cannot abut the inner end plate surface of the orbiting scroll.

Furthermore, it is to be noted that, although in the foregoing embodiments, different technical solutions of the scroll compressor according to the present invention have been described, it is to be understood that the technical solutions in the above embodiments are only illustrative and not restrictive, and various possible modifications may be adopted. For example, although in the above described embodiments the bushing is implemented as a dump bushing, the bushing may also be implemented as other types of bushings, and the various structures that may be used to dump the bushing as described above (e.g., the notch that provides the top of the dump bushing and the stop that provides the base of the dump bushing) may also be applied to various other types of bushings. In addition, although in the above-described embodiment, the drive bearing having the specific structure is provided between the relief bush and the inner peripheral wall of the hub portion, the present invention is not limited to such a drive bearing having the specific structure or even a typical drive bearing may be dispensed with in a specific case (for example, by means of a self-lubricating coating). In addition, although in the above-described embodiments, the stopper portion and the recess portion of the stopper mechanism on the inner end plate surface of the orbiting scroll have a specific shape and configuration, the stopper portion and the recess portion may be configured in any other suitable shape and configuration as long as it is possible to ensure that the lubricating oil can flow onto the outer surface of the bush through the gap between the apex portion of the bush and the recess portion of the stopper mechanism. In addition, although in the above-described embodiments, the outer peripheral portions of the top portions of the unloader bushes are each shown to have a notch thereon, the notch may not be provided, so as to simplify the structure and reduce the difficulty of machining. Also, although in the above-described embodiment, the stopper structure of the unloader bushing is provided around the base of the unloader bushing, other types of stopper structures may be provided on the bushing as long as they prevent the upward movement of the bushing with respect to the orbiting scroll.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the specific embodiments described and illustrated in detail herein, and that various changes may be made to the exemplary embodiments by those skilled in the art without departing from the scope defined by the appended claims.

Claims (10)

1. A scroll compressor, the scroll compressor comprising:

a compression mechanism including an orbiting scroll having an end plate and a hub extending from the end plate, the end plate having an inboard end plate surface located inboard of the hub;

a drive shaft provided with an eccentric pin inserted into the hub to drive the orbiting scroll; and

a bushing disposed between the eccentric pin and the hub portion,

the utility model is characterized in that medial extremity terminal plate surface department is provided with stop gear, stop gear includes spacing portion and concave part, stop gear constructs: when the bush moves to abut against the limit portion, the lubricating oil circulates through the concave portion.

2. The scroll compressor of claim 1, wherein:

the limiting mechanism is configured as follows: when a part of the top portion of the bush abuts against the stopper, a gap allowing the flow of the lubricating oil is provided between the other part of the top portion of the bush and the recess.

3. The scroll compressor of claim 2, wherein:

the limiting portion is configured as a plurality of protrusions spaced apart from each other at the outer periphery of the inner end plate surface, and the recess is configured as a recess at the central position of the inner end plate surface; or

The limiting part is configured as a convex rib extending along the radial direction of the surface of the inner end plate, and the concave parts are configured as two concave parts which are approximately semicircular and positioned at two sides of the convex rib.

4. The scroll compressor of any one of claims 1 to 3, wherein the end plate further has an outboard end plate surface located outboard of the hub portion, a bottom end surface of the limit portion being flush with the outboard end plate surface, and the recess being recessed relative to the outboard end plate surface.

5. The scroll compressor of any one of claims 1 to 3, wherein a notch is provided at a top of the bushing to allow for a flow of lubricating oil therethrough, and the notch is axially aligned with the recess.

6. The scroll compressor of claim 4, wherein a top portion of the bushing is configured with a flat top surface except for the recess.

7. The scroll compressor of any one of claims 1 to 3, wherein a stop structure is provided at a base of the bushing opposite the top portion extending substantially around the base, the stop structure being adapted to abut a tip of the hub to limit movement of the bushing toward the orbiting scroll.

8. The scroll compressor of claim 7, wherein:

the stop structure is realized as a collar that is separate from the bushing and that is fitted to the base of the bushing by means of a snap fit; or

The stop structure is realized as a threaded ring which is separate from the bushing and is fitted to the base of the bushing by means of a threaded fastening; or

The stop structure is realized as a flange which is integrally formed with the bushing.

9. The scroll compressor of any one of claims 1 to 3, wherein the bushing is an unloader bushing that allows radial movement of the bushing relative to the eccentric pin.

10. The scroll compressor of any one of claims 1 to 3, further comprising a drive bearing disposed between the hub portion and the bushing block.

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