CN220769709U - Sealing ring and scroll compressor - Google Patents

Abstract

The utility model provides a sealing ring (6). The sealing ring is mountable in a gap between a first surface (52) and a second surface to be sealed. The sealing ring comprises an annular body (61) and an elastic support (63). The annular body includes an upper wall surface (611), a lower wall surface (612), an inner peripheral surface (613), an outer peripheral surface (614), and an annular groove (62). The upper wall surface abuts against the first surface. The lower wall surface abuts the second surface. An annular groove is provided in the inner peripheral surface and is located between the upper wall surface and the lower wall surface. The elastic support is mounted in the annular groove and is configured to support the upper wall surface and the lower wall surface. The utility model also provides a scroll compressor (1), in particular a co-rotating scroll compressor (CRC), employing said sealing ring.

Description

Sealing ring and scroll compressor

Technical Field

The utility model relates to the technical field of compressors, in particular to a sealing ring and a vortex compressor adopting the sealing ring.

Background

The discharge seal ring of existing compressors is usually arranged between two parts that are stationary relative to each other and thus belongs to the static seal technology.

In scroll compressors, particularly Co-rotating scroll compressors (Co-Rotation Compressor, abbreviated CRC), the active scroll is rotated at high speed, and the friction resistance, wear and the effects of high pressure fluid generated during the rotation process, the prior sealing schemes have not satisfactorily solved the above-mentioned technical problems.

Disclosure of Invention

[ problem ]

The present utility model has been made to solve the above technical problems, and other technical problems that are potential.

[ technical solution ]

According to one aspect of the present utility model, a seal ring is provided. The seal ring is suitable for use in a co-rotating scroll compressor. The seal ring is mountable in a gap between a first surface and a second surface to be sealed near a discharge port of the co-rotating scroll compressor. There is a mutual movement between the first surface and the second surface. The seal ring includes an annular body and a resilient support. The annular body includes an upper wall surface, a lower wall surface, an inner peripheral surface, an outer peripheral surface, and an annular groove. The upper wall surface abuts against the first surface, the lower wall surface abuts against the second surface, and the annular groove is provided in the inner peripheral surface and between the upper wall surface and the lower wall surface. The elastic support is mounted in the annular groove and is configured to support the upper wall surface and the lower wall surface.

In particular, the annular groove has an opening facing radially inward of the seal ring. The opening allows high pressure fluid to enter the annular groove and urge the upper and lower wall surfaces upward and downward, respectively, such that the upper and lower wall surfaces more tightly abut the first and second surfaces, respectively.

Preferably, the material constituting the annular body is a wear-resistant plastic or a wear-resistant rubber. The elastic support member is a spring such as a coil spring or a V-shaped spring piece or a U-shaped spring piece or the like extending along the annular groove.

Optionally, the annular body further includes a positioning groove disposed on the outer peripheral surface. The detent is configured to allow a detent pin to be inserted into the detent to position the seal ring relative to one of the first surface and the second surface.

According to another aspect of the present utility model, a scroll compressor is provided. The scroll compressor includes:

-an active scroll, which is rotatable about its central axis;

-a driven scroll cooperating with the driving scroll and forming a centrally located compression chamber;

-a cover plug secured above the active scroll and having a central through bore aligned with and in communication with the compression chamber; and

-according to the previous aspect of the utility model, the sealing ring is mounted in the gap between the lower surface of the cover plug and the upper surface of the active scroll so that the upper wall surface abuts against the lower surface of the cover plug and the lower wall surface abuts against the upper surface of the active scroll to maintain the tightness between the cover plug and the active scroll.

Preferably, a part of the high-pressure fluid flowing from the compression chamber to the center through hole can flow into the annular groove via the opening and push the upper wall surface and the lower wall surface upward and downward, respectively, so that the upper wall surface and the lower wall surface are more tightly abutted against the lower surface of the cover plug and the upper surface of the active scroll, respectively, thereby achieving a better seal.

In particular, the seal ring is positioned relative to the active scroll so as to rotate with the active scroll. Preferably, the scroll compressor further comprises a locating pin. A pin hole is provided on an upper surface of the active scroll, and the seal ring is mounted such that a positioning groove provided on an outer circumferential surface of the annular body is aligned with the pin hole to allow the positioning pin to be simultaneously inserted into both the positioning groove and the pin hole to position the seal ring with respect to the active scroll to allow the seal ring to rotate together with the active scroll.

Optionally, the central through hole is configured to taper such that an inner diameter of an end of the central through hole near the active scroll is smaller than an inner diameter of an end of the central through hole far from the active scroll, or such that an inner diameter of an end of the central through hole near the active scroll is larger than an inner diameter of an end of the central through hole far from the active scroll. Alternatively, the inner diameter of the central through hole is uniform.

Optionally, an outer diameter of an end of the cover plug near the active scroll is smaller than an outer diameter of an end of the cover plug far from the active scroll, so that a wall thickness of a middle portion of the cover plug is smaller than a wall thickness of both ends of the cover plug.

Optionally, the scroll compressor further comprises:

-a drive located below the driven scroll, the drive having:

a hub having an inner bore and including opposed first and second ends; and

a flange portion protruding outward from a first end portion of the hub portion in a radial direction of the hub portion, the flange portion having a surface facing in a direction from the first end portion to the second end portion, the surface of the flange portion having an annular thrust surface;

-a motor to drive the driving scroll by the driver, the driving scroll driving the driven scroll to rotate, the driven scroll being rotatably supported on the flange portion of the driver; and

-a bracket on which the driving member is rotatably supported.

[ technical Effect ]

By adopting the technical scheme of the utility model, good sealing performance between the active vortex plate and the cover plug can be realized, and meanwhile, the influence of friction resistance and abrasion is reduced to the greatest extent.

Drawings

In order to facilitate an understanding of the utility model, the utility model is described in more detail below on the basis of exemplary embodiments in connection with the accompanying drawings. The same or similar reference numbers are used in the drawings to refer to the same or like parts. It should be understood that the drawings are merely schematic and that the dimensions and proportions of the components in the drawings are not necessarily accurate.

Fig. 1 is a partial longitudinal sectional view of a scroll compressor according to an exemplary embodiment of the present utility model.

Fig. 2A, 2B and 2C are a longitudinal sectional view, a cross-sectional perspective view and an exploded cross-sectional perspective view, respectively, of some major components of a scroll compressor according to an exemplary embodiment of the present utility model.

Fig. 3 is a longitudinal cross-sectional view of several exemplary embodiments of a central through hole of a closure.

Fig. 4A and 4B are a perspective view and a longitudinal sectional view, respectively, of a seal ring according to an exemplary embodiment of the present utility model.

Fig. 5A and 5B are a perspective view and an exploded view, respectively, of an active scroll assembly of a scroll compressor according to an exemplary embodiment of the present utility model.

Fig. 6A is an enlarged view of the area a in fig. 2A, and fig. 6B is an enlarged view of the area B in fig. 2B.

Detailed Description

Specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

The active scroll is rotated at a high speed with respect to the cover plug, and a fluid flow path is formed in the active scroll and the cover plug. While the active scroll is rotating at a high speed relative to the cover plug, high-pressure fluid flows from the compression chamber of the active scroll into the cover plug via the fluid flow path. Therefore, it is necessary to seal the gap between the active scroll and the cover plug well to avoid leakage of high pressure fluid. For example, a seal ring is provided in the gap between the active scroll and the cover plug. In other words, it is now desirable to achieve a seal between a rotating part at high speed and a stationary part, and thus is a dynamic seal problem, particularly at high speeds.

The design difficulty is that: 1) The sealing effect is ensured; 2) The sealing ring rotates at a high speed along with the rotating piece, and can move relatively with the static piece in the moving process, so that the friction work is required to be as small as possible; 3) The seal ring is required to meet reliability requirements.

Fig. 1 is a partial longitudinal sectional view of a scroll compressor (e.g., CRC) according to an exemplary embodiment of the present utility model. Fig. 2A, 2B and 2C are a longitudinal sectional view, a cross-sectional perspective view and an exploded cross-sectional perspective view, respectively, of some major components of a scroll compressor according to an exemplary embodiment of the present utility model. Fig. 6B is an enlarged view of a region B in fig. 2B.

As shown in fig. 1, 2A, 2B, 2C and 6B, the scroll compressor 1 mainly includes a driving scroll 2, a driven scroll 3 and a cover plug 5. The active scroll 2 is rotatable about its central axis. The driven scroll 3 is interfitted with the driving scroll 2, and a compression chamber 4 is formed at their centers. A cover plug 5 is secured over the active scroll 2 and has a central through hole 51. The center through hole 51 is aligned with the compression chamber 4 and communicates with the compression chamber 4. A seal ring 6 is installed in a gap between a lower surface (also referred to as "first surface" in the context) of the cover plug 5 and an upper surface (also referred to as "second surface" in the context) of the active scroll 2 to separate a high pressure region and a low pressure region shown in fig. 2A.

As shown in fig. 1, the scroll compressor 1 further includes a driving member 8, a motor 9, and a bracket 10 below the driven scroll 3. The driver 8 has a hub portion 81 and a flange portion 82. The hub 81 has an inner bore 811, and the hub 81 includes opposite first (i.e., upper) and second (i.e., lower) ends. The flange portion 82 protrudes outward from the first end portion of the hub portion 81 in the radial direction of the hub portion 81. The flange portion 82 has a surface 821 facing in a direction from the first end portion to the second end portion, the surface 821 having an annular thrust surface. The motor 9 drives the active scroll 2 via the drive 8. The driving scroll 2 drives the driven scroll 3 to rotate. The driven scroll 3 is rotatably supported by the flange 82. The driving member 8 is rotatably supported on a bracket 10.

Fig. 3 is a longitudinal cross-sectional view of several exemplary embodiments of the central through hole 51 of the cap plug 5.

Specifically, portions (a) and (B) in fig. 3 show the tapered central through hole 51 as previously described with reference to fig. 2A, 2B, 2C and 6B such that the inner diameter D2 of the end (i.e., lower end) 512 of the central through hole 51 near the active scroll 2 is smaller than the inner diameter D1 of the end (i.e., upper end) 511 of the central through hole 51 remote from the active scroll 2. In this way, the flow field can be improved. More specifically, the inner diameter of the center through hole 51 shown in part (a) is tapered uniformly in the top-to-bottom direction; (b) The inner diameter of the partially shown central through hole 51 is first uniformly tapered in a top-to-bottom direction and then remains uniform, thus remaining generally tapered.

Further, portions (c) and (D) in fig. 3 show two other possible tapered (may also be referred to as "diverging") central through holes 51, wherein the trend of change of the inner diameter of the central through holes 51 shown in portions (c) and (D) is opposite to the trend of change of the inner diameter of the central through holes 51 shown in portions (a) and (b), respectively, such that the inner diameter D2 of the end (i.e., lower end) 512 of the central through holes 51 near the active scroll 2 is larger than the inner diameter D1 of the end (i.e., upper end) 511 of the central through holes 51 remote from the active scroll 2.

In addition, part (e) in fig. 3 shows the center through hole 51 in which the inner diameter is kept uniform.

In addition, in the prior art solutions, the outer diameter of the closure is substantially unchanged in the axial direction of the closure. However, in the exemplary embodiment of the present utility model, the outer diameter of the end (i.e., the lower end) of the cover plug 51 near the active scroll 2 is designed to be smaller than the outer diameter of the end (i.e., the upper end) of the cover plug 51 remote from the active scroll 2. In combination with the tapered configuration of the central through hole 51, the wall thickness t (see fig. 2A) of the middle portion of the lid plug 51 is made smaller than the wall thickness of both ends (i.e., upper and lower ends) of the lid plug 51. In this way, the heat conduction characteristics of the lid plug 51 can be improved.

Further, by adopting the above-described configuration, the outer diameter of the lower end of the cover plug 51 can be made as small as possible to make the linear velocity of the seal ring 6 rotating together with the active scroll 2 with respect to the lower surface 52 (see fig. 6A) of the fixed cover plug 51 as small as possible, whereby the wear rate of the seal ring 6 can be slowed down, and the service life of the seal ring 6 can be prolonged.

Fig. 4A and 4B are a perspective view and a longitudinal sectional view, respectively, of a seal ring according to an exemplary embodiment of the present utility model.

As shown in fig. 4A and 4B, the seal ring 6 mainly includes an annular main body 61 and an elastic support 63. In some of the figures of the present context, although the resilient support 63 may not be shown for ease of description, this does not mean that the resilient support 63 is not present or significant. In fact, the elastic support 63 can play a very critical role in the solution of the present utility model. The material constituting the annular body 61 may be a wear-resistant plastic or a wear-resistant rubber. The annular body 61 includes an upper wall surface 611, a lower wall surface 612, an inner peripheral surface 613, an outer peripheral surface 614, and an annular groove 62. The annular groove 62 is provided in the inner peripheral surface 613 and is located between the upper wall surface 611 and the lower wall surface 612. In addition, the annular groove 62 has an opening 621 facing the radially inner side of the seal ring 6. Thus, as shown on the left side in fig. 4B, the longitudinal section of the annular groove 62 is generally in the shape of letter C. The elastic support 63 is installed in the annular groove 62 and is configured to support the upper wall 611 and the lower wall 612. The elastic support 63 may be a spring such as a coil spring or a V-shaped spring piece or a U-shaped spring piece or the like extending along the annular groove 62.

As shown in fig. 4A, the annular body 61 may further include a positioning groove 64 provided on the outer peripheral surface 614. The positioning groove 64 is configured to allow a positioning pin 7 (described later) to be inserted into the positioning groove 64 to position the seal ring 6 with respect to the lower surface 52 of the fixed cover plug 51 or the bottom surface 211 (see fig. 6A) of the seal groove 21.

Fig. 5A and 5B are a perspective view and an exploded view, respectively, of an active scroll assembly of a scroll compressor according to an exemplary embodiment of the present utility model. Fig. 6A is an enlarged view of the area a in fig. 2A.

As shown in fig. 5A, 5B, 6A and 2C, an annular seal groove 21 is provided on the upper surface of the active scroll 2, and a pin hole 22 is provided on the outer periphery of the seal groove 21. The seal ring 6 may be mounted in the seal groove 21 such that the positioning groove 64 provided on the outer peripheral surface 614 of the annular body 61 of the seal ring 6 is radially aligned with the pin hole 22 to allow the positioning pin 7 to be inserted into both the positioning groove 64 and the pin hole 22 at the same time to position the seal ring 6 with respect to the active scroll 2 and prevent the seal ring 6 from rotating with respect to the active scroll 2 (in other words, to allow the seal ring 6 to rotate together with the active scroll 2).

As shown in fig. 6A and 6B, the seal ring 6 is installed between the upper surface of the active scroll 2 and the lower surface 52 of the cover plug 5, more specifically, in the seal groove 21, the upper wall surface 611 abuts against the lower surface 52 of the cover plug 5, and the lower wall surface 612 abuts against the bottom surface 211 of the seal groove 21, which bottom surface 211 constitutes a part of the upper surface of the active scroll 2. The upper wall 611 and the lower wall 612 of the sealing ring 6 are pressed by the lower surface 52 of the lid plug 5 and the bottom surface 211 of the sealing groove 21, respectively, thereby pressing the elastic support 63 located in the annular groove 62. In this way, under the elastic restoring force of the upper and lower wall surfaces 611 and 612 of the seal ring 6 and the elastic support 63, the upper and lower wall surfaces 611 and 612 closely abut against the lower surface 52 of the cover plug 5 and the bottom surface 211 of the seal groove 21, respectively, whereby the sealability between the cover plug 5 and the active scroll 2 can be maintained.

In addition, the opening 621 of the annular groove 62 allows a part of the high-pressure fluid flowing from the compression chamber 4 to the center through hole 51 to flow into the annular groove 62 and pushes up and down the upper wall surface 611 and the lower wall surface 612 of the seal ring 6, respectively, as generally indicated by arrows R1, R2, R3, R4, R5, and R6 in fig. 6A, so that the upper wall surface 611 and the lower wall surface 612 more closely abut the lower surface 52 of the cover plug 5 and the upper surface of the active scroll 2, respectively.

That is, while the high pressure of the high pressure fluid flowing from the compression chamber 4 to the center through hole 51 is generally disadvantageous for the sealability between the cover plug 5 and the active scroll 2 in the conventional art, the high pressure of the high pressure fluid flowing from the compression chamber 4 to the center through hole 51 advantageously enhances the sealability of the seal ring 6 in the art of the exemplary embodiment of the present utility model.

By adopting the technical solution according to the exemplary embodiment of the present utility model, even in the case where the active scroll 2 rotates at a high speed with respect to the cover plug 5, it is possible to ensure good sealability between the lower surface 52 of the cover plug 5 and the upper surface of the active scroll 2 while minimizing adverse effects of frictional resistance and wear.

Although the technical objects, aspects and effects of the present utility model have been described in detail hereinabove with reference to specific embodiments and modifications, it should be understood that the above-described embodiments and modifications are illustrative only and not limiting. Any modifications, equivalent substitutions, and improvements made by those skilled in the art are intended to be included within the spirit and principles of the present utility model.

Claims (12)

1. A seal ring (6) is characterized in that,

the sealing ring is suitable for a co-rotating scroll compressor, the sealing ring being mountable in a gap between a first surface (52) to be sealed and a second surface in the vicinity of a discharge port of the co-rotating scroll compressor, there being a mutual movement between the first surface and the second surface,

the seal ring (6) comprises:

an annular body (61) including an upper wall surface (611) that abuts against the first surface, a lower wall surface (612) that abuts against the second surface, an inner peripheral surface (613), an outer peripheral surface (614), and an annular groove (62) provided in the inner peripheral surface and between the upper wall surface and the lower wall surface; and

and an elastic support (63) mounted in the annular groove and configured to support the upper wall surface and the lower wall surface.

2. Sealing ring (6) according to claim 1, characterized in that,

the annular groove has an opening (621) facing radially inward of the seal ring (6) that allows high-pressure fluid to enter the annular groove and urge the upper and lower wall surfaces upward and downward, respectively, so that the upper and lower wall surfaces more tightly abut the first and second surfaces, respectively.

3. Sealing ring (6) according to claim 1 or 2, characterized in that,

the material constituting the annular body is wear-resistant plastic or wear-resistant rubber.

4. Sealing ring (6) according to claim 1 or 2, characterized in that,

the elastic support is a coil spring or a V-shaped spring piece or a U-shaped spring piece extending along the annular groove.

5. Sealing ring (6) according to claim 1 or 2, characterized in that,

the annular body further includes a positioning groove (64) provided on the outer peripheral surface, the positioning groove being configured to allow a positioning pin (7) to be inserted into the positioning groove to position the seal ring (6) with respect to one of the first surface and the second surface.

6. A scroll compressor (1), characterized by comprising:

an active scroll (2) which is rotatable around its central axis;

a driven scroll (3) which cooperates with the driving scroll and forms a compression chamber (4) at the center;

a cover plug (5) fixed above the active scroll and having a central through hole (51) aligned with and communicating with the compression chamber,

the scroll compressor further comprising a sealing ring (6) according to any one of the preceding claims, which is mounted in a gap between a lower surface of the cover plug and an upper surface of the active scroll such that the upper wall surface abuts against the lower surface of the cover plug and the lower wall surface abuts against the upper surface of the active scroll to maintain tightness between the cover plug and the active scroll.

7. A scroll compressor (1) according to claim 6, wherein,

a portion of the high-pressure fluid flowing from the compression chamber (4) to the central through hole (51) can flow into the annular groove (62) and push the upper wall surface and the lower wall surface upward and downward, respectively, so that the upper wall surface and the lower wall surface more closely abut against the lower surface of the cover plug and the upper surface of the active scroll, respectively.

8. A scroll compressor (1) according to claim 6, wherein,

the sealing ring (6) is positioned relative to the active scroll so as to rotate therewith.

9. A scroll compressor (1) according to claim 6 or 8, characterized in that,

the scroll compressor further comprises a locating pin (7), and

a pin hole (22) is provided on an upper surface of the active scroll, and the seal ring (6) is mounted such that a positioning groove (64) provided on an outer peripheral surface of the annular body is aligned with the pin hole to allow the positioning pin to be simultaneously inserted into both the positioning groove and the pin hole to position the seal ring (6) with respect to the active scroll to allow the seal ring to rotate together with the active scroll.

10. A scroll compressor (1) according to claim 6, wherein,

the central through hole (51) is configured to be tapered such that an inner diameter (D2) of an end of the central through hole near the active scroll is smaller than an inner diameter (D1) of an end of the central through hole far from the active scroll, or such that an inner diameter (D2) of an end of the central through hole near the active scroll is larger than an inner diameter (D1) of an end of the central through hole far from the active scroll; or alternatively

The inner diameter of the central through hole (51) is uniform.

11. Scroll compressor (1) according to claim 10, characterized in that,

the outer diameter of one end of the cover plug, which is close to the active vortex plate, is smaller than the outer diameter of one end of the cover plug, which is far away from the active vortex plate, so that the wall thickness (t) of the middle part of the cover plug is smaller than the wall thickness of the two ends of the cover plug.

12. The scroll compressor (1) according to claim 6, further comprising:

a driving member (8) located below the driven scroll (3), the driving member (8) having:

a hub (81) having an inner bore (811) and including opposed first and second ends; and

a flange portion (82) protruding outwardly from a first end portion of the hub portion in a radial direction of the hub portion, the flange portion having a surface (821) facing in a direction from the first end portion to the second end portion, the surface of the flange portion having an annular thrust surface;

a motor (9) that drives the driving scroll, which drives the driven scroll to rotate, through the driving member, the driven scroll being rotatably supported on the flange portion (82) of the driving member; and

and a bracket (10) on which the driving member is rotatably supported.