Scroll compressor

Abstract

The present application relates to a scroll compressor, the scroll compressor comprising: a compression mechanism comprising a moving scroll having an end plate and a hub portion extending from the end plate, the end plate having an inner end plate surface located inside the hub portion; a drive shaft provided with an eccentric pin inserted into the hub portion to drive the moving scroll; and a bushing arranged between the eccentric pin and the hub portion, wherein a limiting mechanism is provided at the inner end plate surface, the limiting mechanism comprising a limiting portion and a recess, the limiting mechanism being configured such that, when the bushing moves to abut against the limiting portion, lubricating oil flows through the recess. The limiting mechanism on the inner end plate surface of the moving scroll of the scroll compressor according to the present application can improve the lubrication effect on the outer surface of the bushing.

Description

Technical Field

[0001] This invention relates to the field of compressors, and in particular to a scroll compressor with an improved bushing limiting mechanism. Background Technology

[0002] The content in this section provides only background information related to this disclosure and may not constitute prior art.

[0003] Scroll compressors typically have a compression mechanism that compresses a working fluid (e.g., refrigerant), comprising a stationary scroll and a moving scroll, driven by an eccentric pin on a drive shaft. A bushing may be provided between the eccentric pin and the moving scroll for transmission or other purposes. For example, an unloading bushing may be provided between the eccentric pin and the moving scroll on the drive shaft to additionally achieve radial flexibility. The unloading bushing is configured to be driven by the eccentric pin and capable of radial relative displacement with respect to the eccentric pin under certain conditions, thereby achieving radial flexibility of the compression mechanism (specifically, the moving scroll component). This reduces the machining and installation precision required for the compression mechanism, and allows the stationary and moving scrolls to radially separate when impurities or liquids enter the compression chamber, preventing excessive loads on the stationary and moving scrolls and thus avoiding damage to the compression mechanism.

[0004] However, under specific operating conditions, such as high-speed and heavy-load conditions, the eccentric pin of the drive shaft may tilt. When the tilt angle of the eccentric pin is greater than the tilt angle of the hub of the moving scroll, the unloading bushing will move upward relative to the moving scroll and contact the inner end plate surface of the hub of the moving scroll. In this case, the contact between the top of the unloading bushing and the inner end plate surface may block the flow of lubricating oil to the outer surface of the unloading bushing, thus resulting in a lack of lubrication on the outer surface of the unloading bushing. This leads to severe wear on the outer surface of the unloading bushing and the corresponding contact surfaces of the corresponding components (e.g., the inner surface of the drive bearing), thereby affecting the performance and reliability of the scroll compressor and shortening the service life of the unloading bushing. It is understandable that when other types of bushings are used, the problem of severe wear on the outer surface of the bushing under high-speed and heavy-load conditions also exists.

[0005] Therefore, there is a need for an improved scroll compressor with an improved limiting mechanism for limiting the bushing in order to improve the lubrication of the outer surface of the bushing. Summary of the Invention

[0006] This section provides a general summary of the invention, rather than a full disclosure of the entire scope or all features of the invention.

[0007] The purpose of this invention is to solve or mitigate the technical problems mentioned above. For example, the technical solution of this invention can provide a scroll compressor with an improved limiting mechanism for limiting the bushing, the limiting mechanism being located at least on the inner end plate surface inside the hub of the moving scroll, and configured to allow lubricating oil to flow to the outer surface of the bushing when the bushing moves upward and contacts the inner end plate surface of the moving scroll, so as to lubricate the outer surface of the bushing.

[0008] To address one or more of the aforementioned technical problems, according to one aspect of the present invention, a scroll compressor is provided, comprising: a compression mechanism including a moving scroll having an end plate and a hub extending from the end plate, the end plate having an inner end plate surface located inside the hub; a drive shaft having an eccentric pin inserted into the hub to drive the moving scroll; and a bushing disposed between the eccentric pin and the hub, wherein a limiting mechanism is provided at the inner end plate surface, the limiting mechanism including a limiting portion and a recess, the limiting mechanism being configured such that lubricating oil flows through the recess when the bushing moves to abut against the limiting portion.

[0009] In the aforementioned scroll compressor, the limiting mechanism is configured such that when a portion of the top of the bushing abuts against the limiting portion, a gap exists between the other portion of the top of the bushing and the recess, allowing lubricating oil to flow.

[0010] In the aforementioned scroll compressor, the limiting part is constructed as a plurality of mutually separated protrusions located on the outer periphery of the inner end plate surface, while the recess is constructed as a recess located at the central position of the inner end plate surface; or the limiting part is constructed as a convex rib extending radially along the inner end plate surface, while the recess is constructed as two approximately semi-circular recesses located on both sides of the convex rib.

[0011] In the aforementioned scroll compressor, the end plate also has an outer end plate surface located outside the hub, the bottom surface of the limiting part is flush with the outer end plate surface, and the recess is recessed relative to the outer end plate surface.

[0012] In the aforementioned scroll compressor, a notch is provided at the top of the bushing to allow lubricating oil to flow through, and the notch is aligned axially with the recess.

[0013] In the aforementioned scroll compressor, the top of the bushing is constructed such that, except for the notch, the rest of the bushing has a flat top surface.

[0014] In the aforementioned scroll compressor, a stop structure extending substantially around the base of the bushing, opposite to the top, is provided. The stop structure is adapted to abut against the end of the hub to restrict the bushing from moving toward the moving scroll.

[0015] In the aforementioned scroll compressor, the stop structure is implemented as a retaining ring, which is separate from the bushing and is assembled to the base of the bushing by a snap-fit ​​mechanism; or the stop structure is implemented as a threaded ring, which is separate from the bushing and is assembled to the base of the bushing by a threaded fastening mechanism; or the stop structure is implemented as a flange, which is integrally formed with the bushing.

[0016] In the aforementioned scroll compressor, the bushing is an unloading bushing that allows radial movement of the bushing relative to the eccentric pin.

[0017] In the aforementioned scroll compressor, the scroll compressor also includes a drive bearing, which is disposed between the hub and the bushing.

[0018] The advantages of the scroll compressor according to the present invention are at least as follows. In the scroll compressor according to the present invention, a limiting mechanism for limiting the bushing is provided on the inner end plate surface inside the hub of the moving scroll. The limiting mechanism includes a limiting part and a recess, such that when the bushing moves upward and abuts the limiting part, a gap is created between the top of the bushing and the inner end plate surface through the recess, allowing lubricating oil to flow through. This allows the lubricating oil to flow through the gap to the outer surface of the bushing, ensuring good lubrication of the outer surface of the bushing and thus extending the service life of the bushing. Attached Figure Description

[0019] The following figures illustrate the technical features of one or more embodiments of a conventional scroll compressor and the scroll compressor of the present invention, in which:

[0020] Figure 1 This is a cross-sectional view of a scroll compressor according to a first embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of the moving scroll of a scroll compressor according to a first embodiment of the present invention;

[0022] Figure 3 This is a vertical view of the driven scroll of the scroll compressor according to the first embodiment of the present invention, viewed from the hub direction.

[0023] Figure 4 This is a perspective view showing the unloading bushing of a scroll compressor according to a first embodiment of the present invention;

[0024] Figure 5 This is a cross-sectional view showing a moving scroll of a scroll compressor equipped with an unloading bushing according to a first embodiment of the present invention.

[0025] Figure 6 It shows Figure 5 The image shows an enlarged cross-sectional view of the hub of the moving scroll of a scroll compressor;

[0026] Figure 7 This is a cross-sectional view of the moving scroll of a scroll compressor according to a second embodiment of the present invention;

[0027] Figure 8 This is a vertical view of the moving scroll of a scroll compressor according to a second embodiment of the present invention;

[0028] Figure 9 This is a cross-sectional view showing the moving scroll of a scroll compressor equipped with an unloading bushing according to a second embodiment of the present invention.

[0029] Figure 10 It shows Figure 9 The image shows an enlarged cross-sectional view of the hub of the moving scroll of a scroll compressor;

[0030] Figure 11 It is a three-dimensional view of a retaining ring that can be fitted onto an unloading bushing;

[0031] Figure 12 This illustrates the assembly of a scroll compressor with features such as Figure 11 The cross-sectional view of the moving vortex of the unloading bushing of the retaining ring is shown.

[0032] Figure 13 This is a perspective view of another type of unloading bushing for a scroll compressor according to the present invention;

[0033] Figure 14 This shows the assembly of a scroll compressor. Figure 13 The diagram shows a cross-sectional view of the moving vortex of the unloading bushing.

[0034] Figure 15 This is a perspective view of another type of unloading bushing for a scroll compressor according to the present invention;

[0035] Figure 16 This shows the assembly of a scroll compressor. Figure 15 The cross-sectional view of the moving vortex of the unloading bushing shown. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This detailed description is for illustrative purposes only and is not intended to limit the invention or its applications or uses.

[0037] The present invention provides a scroll compressor, wherein a limiting mechanism is provided on the inner end plate surface of the inner side of the hub of the scroll compressor. The limiting mechanism includes a limiting part and a recess, such that when the bushing moves upward and abuts the limiting part, there is a gap between the top of the bushing and the recess of the limiting mechanism, so that lubricating oil can flow through the gap to the outer surface of the bushing to fully lubricate the outer surface of the bushing.

[0038] In the following description, with reference to the various views in the accompanying drawings, the construction and working principle of the limiting mechanism of the moving scroll of the scroll compressor according to various embodiments of the present invention are described in summary.

[0039] Figure 1 This is a cross-sectional view of a scroll compressor according to a first embodiment of the present invention. Figure 1 As shown, the 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 a moving scroll 10 and a fixed scroll. The drive mechanism includes 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 insert into the inner side of the hub 12 of the moving scroll 10, thereby driving the moving scroll 10 to rotate relative to the fixed scroll through the driving engagement of the eccentric pin 101 and the hub 12. A bushing may be provided between the moving scroll 10 and the eccentric pin 101. For example, in Figure 1 In the scroll compressor 1 shown, an unloading bushing is provided between the moving scroll 10 and the eccentric pin 101, and a drive bearing is selectively provided around the unloading bushing on its radially outer side. The unloading bushing can move radially relative to the eccentric pin to provide radial flexibility to the compression mechanism. When the scroll compressor is in operation, the unloading bushing rotates together with the eccentric pin, while the drive bearing revolves around the stationary scroll together with the moving scroll. Therefore, there is relative motion between the unloading bushing and the drive bearing, resulting in wear on the outer surface of the unloading bushing and the inner surface of the drive bearing. Therefore, an oil passage is provided through the drive shaft to allow lubricating oil to flow from the oil sump through the oil passage to the lubricating oil hole at the top of the eccentric pin to adequately lubricate the contact surfaces of the unloading bushing and the drive bearing.

[0040] Figure 2 and Figure 3 This is a view of the moving scroll of a scroll compressor according to a first embodiment of the present invention.

[0041] Figure 2 This is a cross-sectional view of the moving scroll of a scroll compressor according to a first embodiment of the present invention. Figure 2 As shown, the moving scroll 10 of the scroll compressor includes an end plate 11 and a hub 12 and a blade portion 13 located on opposite surfaces of the end plate 11. The hub 12 is located at the center of the end plate 11 and extends axially from the end plate 11. The end plate 11 includes an inner end plate surface 121 located inside the hub 12 and an outer end plate surface 124 located outside the hub 12, and the hub 12 and the inner end plate surface 121 define a hub cavity for receiving an eccentric pin of the drive shaft, as well as an unloading bushing and a drive bearing.

[0042] Figure 3This is a vertical view taken from the hub direction of the driven scroll of the moving scroll in a scroll compressor according to a first embodiment of the present invention. Figure 3 As shown, a limiting mechanism is provided on the inner end plate surface 121 of the moving vortex 10. This limiting mechanism includes a limiting portion 123 and a recess 122. The limiting portion 123 is constructed as a plurality of mutually spaced protrusions located on the outer periphery of the inner end plate surface 121, for example, four protrusions, while the recess 122 is constructed at the central position of the inner end plate surface 121. When the limiting portion 123 is constructed as four protrusions, the recess 122 can be approximately cross-shaped. The bottom end surface 123a of the limiting portion 123 can be constructed to be flush with the outer end plate surface 124, while the recess 122 can be recessed relative to the outer end plate surface 124 (i.e., recessed into the end plate).

[0043] Figure 4 This is a perspective view showing the unloading bushing of a scroll compressor according to a first embodiment of the present invention. Figure 4 As shown, the unloading bushing 14 is a hollow cylindrical shape and can be accommodated in the inner cavity of the hub. It is arranged around the eccentric pin between the eccentric pin and the inner peripheral wall of the hub. A notch 15 can be selectively provided on the outer peripheral portion of the top of the unloading bushing to facilitate the flow of lubricating oil through the notch 15 to the outer peripheral surface of the unloading bushing 14 (i.e., the outer surface of the unloading bushing 14 that contacts the drive bearing).

[0044] Figure 5 and Figure 6 This is a view of the moving scroll of a scroll compressor according to a first embodiment of the present invention, which is equipped with an unloading bushing.

[0045] Figure 5 This is a cross-sectional view showing a scroll compressor according to a first embodiment of the present invention. Figure 5 As shown, the unloading bushing 14 is housed within the hub cavity and is arranged around an eccentric pin (not shown) between the eccentric pin and the inner peripheral wall of the hub. The drive bearing 16 may be a collar, inserted with an interference fit between the inner peripheral wall of the hub cavity and the unloading bushing 14, and arranged around the unloading bushing 14. When the scroll compressor is in operation, the unloading bushing 14 rotates with the eccentric pin, while the drive bearing 16 revolves around a stationary scroll with the moving scroll. Therefore, relative motion exists between the unloading bushing 14 and the drive bearing 16, resulting in wear on the contact surfaces of the unloading bushing 14 and the drive bearing 16. Therefore, lubricating oil is required to flow between the contact surfaces of the unloading bushing 14 and the drive bearing 16 to adequately lubricate them, thereby ensuring the radial flexibility of the scroll compressor's compression mechanism and a long service life for the unloading bushing and the drive bearing.

[0046] Figure 6 It shows Figure 5 The diagram shows an enlarged cross-sectional view of the hub of the moving scroll of a scroll compressor. When the scroll compressor is in operation, especially under high-speed, heavy-load conditions, the eccentric pin (not shown) of the drive shaft may tilt, causing the unloading bushing 14 to move upward relative to the moving scroll, so that its top contacts the inner end plate surface 121 of the moving scroll 10. Since the limiting mechanism on the inner end plate surface 121 includes a limiting portion 123 and a cross-shaped recess 122, a portion of the top of the unloading bushing 14 will abut against the limiting portion 123 and cannot move further upward to abut against the recess 122. In this case, a gap will exist between the other portion of the top of the unloading bushing 14 and the recess 122 of the inner end plate surface 121, allowing lubricating oil flowing from the lubrication hole of the eccentric pin to flow through this gap between the unloading bushing 14 and the drive bearing 16, ensuring that the lubricating oil can adequately lubricate the contact surfaces of the unloading bushing 14 and the drive bearing 16. In particular, the notch 15 (not shown) of the unloading bushing 14 can be aligned axially with the recess 122 to more reliably ensure the existence of the clearance and to ensure that the clearance has a larger flow area, thereby facilitating smoother flow of lubricating oil between the unloading bushing 14 and the drive bearing 16. Furthermore, the top of the unloading bushing 14 can be configured such that the remainder, except for the notch 15, has a flat top surface. In this way, no additional protrusions or protrusions for limiting the position of the unloading bushing 14 are required, thus simplifying the structure of the unloading bushing 14.

[0047] The following describes the advantageous effects of the scroll compressor according to the first embodiment of the present invention. Because a limiting mechanism is provided on the inner end plate surface inside the hub of the moving scroll, even when the unloading bushing moves upward to abut against the inner end plate surface during operation of the scroll compressor, it is ensured that the top of the unloading bushing only abuts against the limiting portion of the limiting mechanism and cannot continue to move upward to abut against the recess of the limiting mechanism. This creates a gap between the top of the unloading bushing and the recess of the limiting mechanism, allowing lubricating oil to flow between the unloading bushing and the drive bearing to adequately lubricate their contact surfaces. This ensures good lubrication of the contact surfaces between the unloading bushing and the drive bearing, enhances the radial flexibility of the compression mechanism, and extends the service life of the unloading bushing and the drive bearing. Furthermore, since the bottom surface of the limiting part of the limiting mechanism is flush with the outer end plate surface of the hub, and the recess is recessed into the inner side of the end plate, the limiting mechanism does not require additional material and ensures a large volume of the inner cavity of the hub. Moreover, since the inner end plate surface does not need to bear a large load, it does not have a significant impact on the strength of the end plate.

[0048] Figure 7 and Figure 8This is a view of the moving scroll of a scroll compressor according to a second embodiment of the present invention.

[0049] Figure 7 This is a cross-sectional view of the moving scroll of a scroll compressor according to a second embodiment of the present invention. Figure 2 As shown, the moving scroll 20 of the scroll compressor includes an end plate 21 and a hub 22 and a blade portion 23 located on opposite surfaces of the end plate 21. The hub 22 is located at the center of the end plate 21 and extends axially from the end plate 21. The end plate 21 also includes an inner end plate surface 221 located inside the hub 22 and an outer end plate surface 225 located outside the hub 22, and the hub 22 and the inner end plate surface 221 define a hub cavity for accommodating an eccentric pin of the drive shaft, as well as an unloading bushing and a drive bearing.

[0050] Figure 8 This is a vertical view taken from the hub direction of the driven scroll of the moving scroll of a scroll compressor according to a second embodiment of the present invention. Figure 8 As shown, a limiting mechanism is provided on the inner end plate surface 221 of the moving vortex 20. This limiting mechanism includes a rib 224 (corresponding to a limiting portion) extending radially along the inner end plate surface 221 and two generally semi-circular recesses 222 and 223 located on either side of the rib 224, wherein the rib 224 protrudes relative to the two recesses 222 and 223. The bottom end surface 224a of the rib 224 can be configured to be flush with the outer end plate surface 225, while the recesses 222 and 223 can be recessed relative to the outer end plate surface 225 (i.e., recessed into the end plate).

[0051] Figure 9 and Figure 10 This is a view of the moving scroll of a scroll compressor according to a second embodiment of the present invention, which is equipped with an unloading bushing.

[0052] Figure 9 This is a cross-sectional view showing the moving scroll of a scroll compressor according to a second embodiment of the present invention. It should be noted that the unloading bushing of the scroll compressor of the second embodiment can be the same as that of the scroll compressor of the first embodiment, and therefore will not be described in detail. Figure 9 As shown, the unloading bushing 24 is housed within the hub cavity of the moving scroll 20 and is arranged around the eccentric pin (not shown) between the eccentric pin and the inner peripheral wall of the hub 22. The drive bearing 25 may be a collar and is inserted between the hub 22 and the unloading bushing 24 with an interference fit.

[0053] Figure 10 It shows Figure 9The diagram shows an enlarged cross-sectional view of the hub of the moving scroll of the scroll compressor. When the scroll compressor is in operation, the eccentric pin (not shown) of the drive shaft may tilt, causing the unloading bushing 24 to move upward relative to the moving scroll and abut against the rib 224 on the inner end plate surface 221 of the moving scroll 20. Since the rib 224 protrudes relative to the recesses 222 and 223, the unloading bushing 24 will be blocked by the rib 224 and cannot move further upward to contact the recesses 222 and 223. In this case, a gap will exist between the top of the unloading bushing 24 and the recesses 222 and 223 on the inner end plate surface 221, allowing lubricating oil flowing from the lubrication hole of the eccentric pin to flow through this gap between the unloading bushing 24 and the drive bearing 25, ensuring that the lubricating oil adequately lubricates the contact surfaces of the unloading bushing 24 and the drive bearing 25.

[0054] The scroll compressor according to the second embodiment can also achieve similar technical effects as the scroll compressor according to the first embodiment. That is, when the unloading bushing moves upward, it first abuts against the protruding rib of the limiting mechanism on the inner end plate surface of the moving scroll and cannot move further upward, thereby allowing a gap to exist between the top of the unloading bushing and the recess of the limiting mechanism on the inner end plate surface, so that lubricating oil can flow through the gap to the unloading bushing and the drive bearing to fully lubricate their contact surfaces.

[0055] Figures 11-16 Three other unloading bushings, structurally different from the aforementioned unloading bushing, are shown. All three unloading bushings have a stop structure extending substantially around the base on the base opposite to the top, preventing axial upward movement of the unloading bushing relative to the moving scroll. This prevents the unloading bushing from moving upward to abut against the inner end plate surface of the moving scroll, thus ensuring that lubricating oil flow to the outer peripheral surface of the unloading bushing is not obstructed. Furthermore, all three unloading bushings can be fitted into the moving scroll of the scroll compressor according to the above embodiment of the present invention.

[0056] Figure 11 This is a 3D view of a retaining ring that can be fitted onto an unloading bushing. (Example) Figure 11 As shown, the retaining ring 31 is separate from the unloading bushing and is substantially annular in shape, and can be fitted onto the base in a manner that extends substantially around the base of the unloading bushing (not shown) to serve as a stop structure. A groove may be provided on the base of the unloading bushing, and the retaining ring 31 can be inserted into the groove by a snap-fit ​​engagement to fit onto the base of the unloading bushing.

[0057] Figure 12 This illustrates the assembly of a scroll compressor with features such as Figure 11 The diagram shows a cross-sectional view of the moving scroll of the unloading bushing of the retaining ring. (See diagram for reference.) Figure 12As shown, when the unloading bushing 30 is assembled into the inner cavity of the hub of the moving scroll, the retaining ring 31, which is provided around the base of the unloading bushing 30, will abut against the end of the hub of the moving scroll, so that the unloading bushing 30 cannot move toward the moving scroll and thus will not abut against the inner end plate surface of the moving scroll.

[0058] Figure 13 This is a perspective view of another type of unloading bushing for a scroll compressor according to the present invention. Figure 13 As shown, the unloading bushing 40 is a hollow cylindrical shape, and a threaded ring 41 extending around the base of the unloading bushing 40 as a stop structure is provided on the base of the unloading bushing 40. The threaded ring 41 and the unloading bushing 40 can be separate. The inner wall of the threaded ring 41 and the outer surface of the base of the unloading bushing 40 are provided with mating threads, so that the threaded ring 41 can be assembled to the base of the unloading bushing 40 by thread fastening.

[0059] Figure 14 This shows the assembly of a scroll compressor. Figure 13 The diagram shows a cross-sectional view of the moving vortex of the unloading bushing. (See figure.) Figure 14 As shown, when the unloading bushing 40 is assembled into the inner cavity of the hub of the moving scroll, the threaded ring 41 fixed around the base of the unloading bushing 40 will abut against the end of the hub of the moving scroll, so that the unloading bushing 40 cannot move toward the moving scroll and thus will not abut against the inner end plate surface of the moving scroll.

[0060] Figure 15 This is a perspective view of another type of unloading bushing for a scroll compressor according to the present invention. Figure 15 As shown, the unloading bushing 50 is a hollow cylindrical shape, and a flange 51, which serves as a stop structure and extends substantially around the base, is provided on the base of the unloading bushing 50. The flange 51 and the unloading bushing 50 may be integral.

[0061] Figure 16 This shows the assembly of a scroll compressor. Figure 15 The diagram shows a cross-sectional view of the moving vortex of the unloading bushing. (See figure.) Figure 16 As shown, when the unloading bushing 50 is assembled into the inner cavity of the hub of the moving scroll, the flange 51, which is provided substantially around the base of the unloading bushing 50, will abut against the end of the hub of the moving scroll, so that the unloading bushing 50 cannot move toward the moving scroll and thus will not abut against the inner end plate surface of the moving scroll.

[0062] Furthermore, it should be noted that although different technical solutions of the scroll compressor according to the present invention have been described in the foregoing embodiments, it is understood that the technical solutions in the above embodiments are merely illustrative and not limiting, and various feasible variations can be adopted. For example, although the bushing is implemented as an unloading bushing in the above embodiments, the bushing can also be implemented as other types of bushings, and various structures that can be used for unloading bushings as described above (e.g., a notch at the top of the unloading bushing and a stop structure at the base of the unloading bushing) can also be applied to various other types of bushings. In addition, although a drive bearing with a specific structure is provided between the unloading bushing and the inner peripheral wall of the hub in the above embodiments, the present invention is not limited to such a drive bearing with a specific structure, or even in certain cases, a typical drive bearing can be omitted (e.g., by using a self-lubricating coating). In addition, although the limiting part and recess of the limiting mechanism on the inner end plate surface of the moving scroll have a specific shape and structure in the above embodiments, the limiting part and recess can be constructed as any other suitable shape and structure, as long as it ensures that lubricating oil can flow to the outer surface of the bushing through the gap between the top of the bushing and the recess of the limiting mechanism. Furthermore, although a notch is shown on the outer periphery of the top of the unloading bushing in the above embodiments, this notch may be omitted to simplify the structure and reduce manufacturing difficulty. Also, although the stop structure of the unloading bushing is provided around the base of the unloading bushing in the above embodiments, other types of stop structures may be provided on the bushing, as long as they prevent the bushing from moving upwards relative to the moving vortex.

[0063] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the specific embodiments described and shown herein, and various changes can be made to the exemplary embodiments by those skilled in the art without departing from the scope defined by the claims.

Claims

1. A scroll compressor (1), the scroll compressor (1) comprising: A compression mechanism comprising a moving scroll (10, 20) having an end plate (11, 21) and a hub (12, 22) extending from the end plate (11, 21), the end plate having an inner end plate surface (121, 221) located inside the hub. Drive shaft (100), the drive shaft being provided with an eccentric pin (101), the eccentric pin (101) being inserted into the hub to drive the moving scroll (10, 20); and Bushings (14, 24, 30, 40, 50), the bushings being arranged between the eccentric pin and the hub. The feature is that a limiting mechanism is provided on the surface (121, 221) of the inner end plate. The limiting mechanism includes a limiting part (123, 224) and a recess (122, 222, 223). The limiting mechanism is configured such that when the bushing moves to abut against the limiting part, lubricating oil flows through the recess, and The end plates (11, 21) also have outer end plate surfaces (124, 225) located outside the hub, and the recesses (122, 222, 223) are recessed relative to the outer end plate surfaces (124, 225).

2. The scroll compressor (1) according to claim 1, characterized in that: The limiting mechanism is configured such that when a portion of the top of the bushing abuts the limiting portion, a gap exists between the other portion of the top of the bushing and the recess, allowing lubricating oil to flow.

3. The scroll compressor (1) according to claim 2, characterized in that: The limiting portion is constructed as a plurality of mutually spaced protrusions (123) located on the outer periphery of the inner end plate surface (121), while the recess is constructed as a recess (122) located at the center of the inner end plate surface (121); or The limiting part is constructed as a convex rib (224) extending radially along the surface (221) of the inner end plate, while the recess is constructed as two approximately semi-circular recesses (222, 223) located on both sides of the convex rib.

4. The scroll compressor (1) according to any one of claims 1 to 3, characterized in that, The bottom surface (123a, 224a) of the limiting part (123, 224) is flush with the surface (124, 225) of the outer end plate.

5. The scroll compressor (1) according to any one of claims 1 to 3, characterized in that, A notch (15) is provided at the top of the bushing to allow lubricating oil to flow through, and the notch (15) is aligned axially with the recess (122).

6. The scroll compressor (1) according to claim 5, characterized in that, The top of the bushing (14) is configured such that the portion other than the notch (15) has a flat top surface.

7. The scroll compressor (1) according to any one of claims 1 to 3, characterized in that, A stop structure (31, 41, 51) extending substantially around the base of the bushing (30, 40, 50) opposite to the top of the bushing is provided. The stop structure is adapted to abut against the end of the hub to restrict the bushing from moving toward the vortex.

8. The scroll compressor (1) according to claim 7, characterized in that: The stop structure is implemented as a retaining ring (31), which is separate from the bushing (30) and is assembled to the base of the bushing (30) by a snap-fit ​​engagement; or The stop structure is implemented as a threaded ring (41), which is separate from the bushing (40) and is assembled to the base of the bushing (40) by means of threaded fastening; or The stop structure is implemented as a flange (51), and the flange (51) and the bushing (50) are integrally formed.

9. The scroll compressor (1) according to any one of claims 1 to 3, characterized in that, The bushing is an unloading bushing that allows the bushing to move radially relative to the eccentric pin.

10. The scroll compressor (1) according to any one of claims 1 to 3, characterized in that, The scroll compressor also includes drive bearings (16, 25) disposed between the hub (12, 22) and the bushings (14, 24).

Images