Scroll compressor

Abstract

The present disclosure provides a scroll compressor, which includes: a scroll assembly configured to compress a working fluid and including a fixed scroll; a guide ring, the fixed scroll including a first section in clearance fit with the guide ring, the guide ring including a second section, the first section having a first length H, the difference between the inner diameter of the second section and the outer diameter of the first section being a first width Δ; a main bearing housing; and a positioning pin, the positioning pin including a third section in clearance fit with the orifice of the fixed scroll, the fixed scroll including a fourth section opposed to the third section, the third section having a second length h, the difference between the orifice width d2 and the pin width d1 being a second width δ; the ratio of the first width Δ to the first length H being less than the ratio of the second width δ to the second length h. The scroll compressor according to the present disclosure can prevent the positioning pin from being damaged due to excessive stress and the connection strength from being reduced.

Description

Technical Field

[0001] The present invention relates to a scroll compressor. Background Art

[0002] The content of this section only provides background information related to the present disclosure, which may not constitute prior art.

[0003] Compressors generally include a moving scroll and a fixed scroll that mesh with each other. To keep the fixed scroll of the compressor in place, positioning pins are needed to prevent the fixed scroll from rotating and to limit its position. However, during the operation of the compressor, there are problems such as wear and damage of the positioning pins and reduction of connection strength due to excessive stress on the positioning pins. This will affect the reliable positioning of the fixed scroll and have an adverse impact on the overall performance of the compressor.

[0004] Therefore, there is a need to provide an improved scroll compressor. Summary of the Invention

[0005] An object of one or more embodiments of the present disclosure is to prevent the positioning pins from being damaged due to excessive stress and the connection strength from decreasing while ensuring the positioning accuracy of the fixed scroll by the positioning pins.

[0006] Another object of one or more embodiments of the present disclosure is to reduce the wear and contact stress of the fixed scroll on the positioning pins.

[0007] According to one aspect of the present disclosure, there is provided a scroll compressor, comprising: a scroll assembly for compressing a working fluid and including a fixed scroll provided with an orifice; a guide ring for restricting the radial movement of the fixed scroll and guiding the axial movement of the fixed scroll, the fixed scroll including a first section that is in clearance fit with the inner side of the guide ring, the guide ring including a second section opposed to the first section, the first section having a first length H extending in the axial direction, and the difference between the inner diameter of the second section and the outer diameter of the first section being a first width Δ; a main bearing seat for supporting the scroll assembly and provided with a pin hole; and a positioning pin fixedly disposed in the pin hole of the main bearing seat, the positioning pin including a third section that is in clearance fit with the orifice of the fixed scroll, the wall of the orifice including a fourth section opposed to the third section, the third section having a second length h extending in the axial direction, the fourth section having an orifice width d2 extending in the circumferential direction, the third section having a pin width d1 extending in the circumferential direction, the difference between the orifice width d2 and the pin width d1 being a second width δ, and the ratio of the first width Δ to the first length H being less than the ratio of the second width δ to the second length h.

[0008] According to one aspect of the present disclosure, the stationary scroll includes a flange extending radially outward from the stationary scroll body, and the orifice is a notch formed in the flange.

[0009] According to one aspect of the present disclosure, the positioning pin is eccentrically disposed in the orifice.

[0010] According to one aspect of the present disclosure, the center of the pin hole of the main bearing housing is not aligned with the center of the orifice of the stationary scroll.

[0011] According to one aspect of the present disclosure, the positioning pin has an interference fit with the pin hole of the main bearing housing.

[0012] According to one aspect of the present disclosure, the scroll compressor further includes a housing, and the guide ring is disposed between the housing and the stationary scroll.

[0013] According to another aspect of the present disclosure, there is provided a scroll compressor, including: a scroll assembly configured to compress a working fluid and including a stationary scroll provided with an orifice; a guide ring configured to restrict radial movement of the stationary scroll and guide axial movement of the stationary scroll, the stationary scroll including a first section having a clearance fit with the inner side of the guide ring, the guide ring including a second section opposed to the first section, the first section having a first length H extending in the axial direction, a difference between an inner diameter of the second section and an outer diameter of the first section being a first width Δ; a main bearing housing configured to support the scroll assembly and provided with a pin hole; and a positioning pin including a third section having a clearance fit with the pin hole of the main bearing housing, a wall of the pin hole including a fourth section opposed to the third section, the third section having a second length h extending in the axial direction, the fourth section having a hole width d2 extending in the circumferential direction, the third section having a pin width d1 extending in the circumferential direction, a difference between the hole width d2 and the pin width d1 being a second width δ, and a ratio of the first width Δ to the first length H being less than a ratio of the second width δ to the second length h.

[0014] According to another aspect of the present disclosure, the positioning pin is eccentrically disposed in the pin hole.

[0015] According to another aspect of the present disclosure, the positioning pin has an interference fit with the orifice of the stationary scroll.

[0016] According to another aspect of the present disclosure, the scroll assembly further includes a moving scroll, and the pin hole and the orifice are positioned such that the positioning pin is located radially outside the moving scroll.

[0017] The scroll compressor according to the present disclosure can ensure the positioning accuracy of the fixed scroll by the positioning pin while preventing the positioning pin from being damaged due to excessive stress and thus reducing the connection strength, thereby ensuring reliable and accurate positioning of the fixed scroll by the positioning pin. Description of the Drawings

[0018] Through the following description with reference to the drawings, the features and advantages of one or more embodiments of the present invention will become more readily understood. The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. The drawings are not drawn to scale, and some features may be enlarged or reduced to show details of specific components. In the drawings:

[0019] Figure 1 is a schematic cross-sectional view showing a scroll compressor according to the present disclosure;

[0020] Figure 2 is a schematic cross-sectional view showing a compression assembly according to the first embodiment of the present disclosure;

[0021] Figure 3 is Figure 2 a partial enlarged view of part A in

[0022] Figure 4 is a schematic front view showing a compression assembly according to the first embodiment of the present disclosure;

[0023] Figure 5 is Figure 4 a partial enlarged view of part B in

[0024] Figure 6 is a schematic cross-sectional view showing another cross-section of a compression assembly according to the first embodiment of the present disclosure;

[0025] Figure 7 is Figure 6 a partial enlarged view of part C in

[0026] Figure 8 is a schematic cross-sectional view showing the state of a compression assembly according to the first embodiment of the present disclosure when the fixed scroll overturns;

[0027] Figure 9 is Figure 8 a partial enlarged view of part D in

[0028] Figure 10a is a schematic front view showing the state of a compression assembly according to the first embodiment of the present disclosure when the fixed scroll overturns;

[0029] Figure 10b is Figure 10a a partial enlarged view of part E in

[0030] Figure 11 The front view schematically shows a compression assembly according to a second embodiment of the present disclosure;

[0031] Figure 12 is Figure 11 a partial enlarged view of part F in; and

[0032] Figure 13a The front view schematically shows the state of the compression assembly according to the second embodiment of the present disclosure when the fixed scroll tilts; and

[0033] Figure 13b is Figure 13a a partial enlarged view of part G in. Detailed Embodiments

[0034] The present disclosure will be described below with reference to the accompanying drawings. The description is merely exemplary and does not constitute a limitation on the present disclosure and its applications.

[0035] As Figure 1 shown, the scroll compressor 1 includes a housing 10. More specifically, the housing 10 may be composed of a generally cylindrical body 12, a top cover provided at one end of the body 12, and a bottom cover provided at the other end of the body 12.

[0036] A compression mechanism and a drive mechanism are disposed inside the housing 10. The compression mechanism has a scroll assembly including a moving scroll 20 and a fixed scroll 30 that are engaged with each other. The moving scroll 20 and the fixed scroll 30 respectively include a moving scroll wrap and a fixed scroll wrap, and the moving scroll wrap and the fixed scroll wrap are engaged with each other and extend from a moving scroll end plate 22 and a fixed scroll end plate 32 respectively. The fixed scroll 30 includes a fixed scroll body and a flange 34 extending radially outward from the fixed scroll body, wherein the fixed scroll body is defined by a circumferential wall portion 340 that surrounds the outermost radial side of the scroll wrap.

[0037] To properly position the scroll assembly, the scroll compressor 1 includes a guide ring 70. As Figure 1 shown, the guide ring 70 is disposed between the fixed scroll 30 and the housing 10 to achieve centering and limiting of the fixed scroll. Referring to Figure 2 and Figure 3 , the fixed scroll 30 is in clearance fit inside the guide ring 70. Herein, clearance fit refers to a fit having a clearance (including a minimum clearance equal to zero). The clearance fit allows the fixed scroll 30 to be freely installed in the guide ring 70, and at the same time, after installation, the fixed scroll 30 can move axially to a certain extent relative to the guide ring 70 and the housing 10, and the radial movement of the fixed scroll relative to the guide ring 70 and the housing 10 is restricted by the guide ring. As Figure 2As shown, the guide ring 70 has a stepped portion extending toward the flange 34 of the fixed scroll 30. The stepped portion can abut against the flange 34 of the fixed scroll, thereby guiding the movement of the fixed scroll 30 in the axial direction.

[0038] Referring to Figure 4 , the guide ring 70 can be fixed to the main bearing housing 50. The main bearing housing 50 is adapted to support a scroll assembly including a fixed scroll and an orbiting scroll. The main bearing housing 50 includes an annular central body and an arm portion located radially outside the central body and extending axially upward. The guide ring 70 is fixed relative to the main bearing housing 50 and thus relative to the housing 10 by extending a bolt 8 through an aperture of the guide ring 70 and into a pin hole of the arm portion of the main bearing housing 50.

[0039] The scroll compressor may further include a positioning pin 80 that is fitted in the fixed scroll 30 and the main bearing housing 50 to prevent the fixed scroll 30 from rotating relative to the main bearing housing 50. Specifically, one end of the positioning pin 80 can be fitted in the main bearing housing 50 while the other end can be in clearance fit with the fixed scroll to limit the rotation of the fixed scroll 30. Hereinafter, the compressor components including the orbiting scroll 20, the fixed scroll 30, the main bearing housing 50, the guide ring 70, and the positioning pin 80 are referred to as a compression assembly.

[0040] The inventors of the present application have noticed that in a compression assembly using a guide ring and a positioning pin as positioning members, the performance of the compressor is usually affected due to wear of the positioning pin and reduction of the connection strength. This is because when the fixed scroll overturns, the positioning pin will bear a significantly increased radial stress. This extremely large stress caused by the overturning of the fixed scroll makes the positioning pin prone to wear and damage and the connection strength is reduced, which will cause the fixed scroll to be unable to be reliably and accurately positioned in the compressor, thus affecting the operation of the compressor. To solve the above problems, the inventors of the present application have found through repeated research that by adjusting the mating manner between the components of the scroll compressor, the above problems can be effectively reduced and overcome.

[0041] Next, the mating manner between the fixed scroll, the positioning pin, and the guide ring in the compression assembly according to the first embodiment of the present application will be described in detail. Referring to Figure 3, the fixed scroll 30 includes a first section 33 that is clearance - fitted within the guide ring 70. The guide ring 70 includes a second section 72 that is opposed to the first section 33. The width of the unilateral clearance g between the first section 33 and the second section 72 in the radial direction of the fixed scroll is Δ / 2, and the first section 33 has a first length H extending in the axial direction of the fixed scroll. The fixed scroll 30 and the guide ring 70 also respectively include a fifth section 35 and a sixth section 74 that are opposed to each other, and the width of the clearance between the fifth section 35 and the sixth section 74 is greater than the width of the clearance g. Since the fixed scroll 30 is centered and fitted within the guide ring 70, the radial width of the bilateral clearance between the first section 33 and the second section 72 is twice the radial width of the unilateral clearance, that is, Δ. In this application, the difference between the inner diameter of the second section 72 and the outer diameter of the first section 33 is equal to the bilateral clearance width Δ (hereinafter simply referred to as the first width Δ).

[0042] Referring to Figure 5 and Figure 6 , the positioning pin 80 is fitted within the orifice 36 of the fixed scroll 30. The orifice 36 can be formed in the flange 34 to avoid reducing the strength of the peripheral wall portion 340 of the fixed scroll 30 and prevent the positioning pin from occupying the profile space of the scroll. As Figure 6 specifically shown, the orifice 36 can be formed as a notch that is open on the radial outer side, and the circumferentially - opposed walls of the notch can limit the circumferential movement of the positioning pin 80. Referring to Figure 5 , the positioning pin 80 includes a third section 82 that is clearance - fitted within the orifice 36. The orifice 36 includes a fourth section 362 that is opposed to the third section 82. The third section 82 has a second length h extending in the axial direction of the fixed scroll. The fixed scroll 30 and the positioning pin 80 also respectively include a seventh section 364 and an eighth section 84 that are opposed to each other, and the width of the clearance between the seventh section 364 and the eighth section 84 is greater than the width of the clearance between the third section 82 and the fourth section 362. Referring to Figure 5 and Figure 6 , the orifice 36 has a hole width d2 extending in the circumferential direction at the fourth section 362, and the positioning pin 80 has a pin width d1 extending in the circumferential direction at the third section 82. The difference between the hole width d2 and the pin width d1 is the second width δ. In Figure 6 the illustrated embodiment, the positioning pin 80 is formed with a circular cross - section and at this time the pin width d1 of the third section extending in the circumferential direction is its outer diameter, and the orifice 36 is formed with a rectangular cross - section and at this time the hole width d2 of the fourth section extending in the circumferential direction is the width between the opposite two surfaces of the orifice 36. Of course, the positioning pin 80 can also be formed with a rectangular cross - section and the orifice 36 can be formed with a circular cross - section. As Figure 7As shown, the positioning pin 80 is centrally arranged at the orifice 36. Therefore, the unilateral clearance dimension between the third section 82 of the positioning pin 80 and the fourth section of the orifice 36 on one side in the circumferential direction is δ / 2.

[0043] Compared with the conventional compression assembly, in the compression assembly according to the first embodiment of the present disclosure, by reducing the second length h, the mating relationship between the fixed scroll 30, the guide ring 70, and the positioning pin 80 satisfies the following relational expression:

[0044] Δ / H<δ / h

[0045] Where, Δ is the first width, H is the first length, δ is the second width, and h is the second length.

[0046] In this way, when the fixed scroll 30 overturns, the fixed scroll 30 first contacts the guide ring 70, thereby avoiding the fixed scroll 30 applying additional stress to the positioning pin 80 and preventing the positioning pin 80 from being damaged or having reduced connection strength due to excessive overturning moment. Specifically, as Figure 8 and 9 shown, when the fixed scroll 30 overturns, both sides of the fixed scroll 30 contact the guide ring 70 and thus the fixed scroll 30 generates an overturning moment acting on the guide ring 70. On the other hand, referring to Figure 10b , the positioning pin 80 only contacts the orifice 36 of the fixed scroll 30 on one side, and thus the fixed scroll 30 does not generate an overturning moment on the positioning pin 80. Thus, it is possible to prevent the overturned fixed scroll from applying excessive stress to the positioning pin 80.

[0047] Moreover, in the compression assembly according to the first embodiment of the present disclosure, since the second length h is reduced, the force on the positioning pin can be further improved. Specifically, by reducing the second length h, the length of the cantilever of the positioning pin 80 protruding from the main bearing seat 50 can be reduced. Since the cantilever length is reduced, when the acting force of the fixed scroll on the positioning pin is constant, the bending moment received by the positioning pin is also correspondingly reduced. In addition, since only the second length h is reduced without adjusting the second width δ, the positioning accuracy of the positioning pin for the fixed scroll can be ensured, preventing the positioning accuracy from being reduced due to an increase in the second width δ.

[0048] In the compression assembly according to the first embodiment of the present disclosure, the second width δ is preferably equal to 2L, where L is the minimum value of the unilateral clearance that can be achieved under the existing processing conditions. In this way, precise positioning of the fixed scroll can be achieved without changing the processing conditions and processing accuracy.

[0049] Next, reference will be made to Figure 11-13. A specific description is given of the compression assembly according to the second embodiment of the present disclosure. The main structures and functions of the compression assembly according to the second embodiment of the present disclosure are basically the same as those of the compression assembly according to the first embodiment of the present disclosure, so they will not be described in detail hereinafter. Only the differences will be described below.

[0050] As Figure 12 shown, the positioning pin 80a of the compression assembly according to the second embodiment of the present disclosure is eccentrically fitted in the orifice 36 of the fixed scroll. Specifically, on the first side (i.e., Figure 12 the left side in Figure 12 ), there is a gap g1 between the third section 82a of the positioning pin 80a and the fourth section 362 of the orifice 36. On the second side (i.e., Figure 12 the right side in Figure 12 ), there is a gap g2 between the third section 82a of the positioning pin 80a and the fourth section 362 of the orifice 36. Referring to Figure 12 , the width of the gap g1 is smaller than the width of the gap g2. It should be noted that Figure 12 shows the arrangement of the positioning pin in the assembled state. At this time, the width value of the gap g1 is greater than zero. However, during the operation of the scroll compressor, due to the acting force of the scroll, the width value of the gap g1 can be reduced to zero. At this time, the positioning pin 80a comes into contact with the orifice 36 of the positioning pin on the first side (i.e., Figure 12 the left side in ).

[0051] As Figure 11 shown, one end of the positioning pin 80a is fitted in the pin hole (not shown) of the main bearing seat 50a. The center of the pin hole of the main bearing seat 50a may not be aligned with the center of the orifice 36 of the fixed scroll 30. At this time, one end of the positioning pin 80a can be centeredly fitted in the pin hole of the main bearing seat 50a and the other end can be eccentrically fitted in the orifice 36 of the fixed scroll 30. Of course, the center of the pin hole of the main bearing seat 50a and the center of the orifice 36 of the fixed scroll 30 may also be aligned with each other. At this time, the positioning pin 80a is eccentrically arranged in both the pin hole and the orifice 36. Preferably, the positioning pin 80a can be centeredly fitted (e.g., interference-fitted) in the pin hole of the main bearing seat 50a to facilitate the installation and positioning of the positioning pin.

[0052] Compared with the case where the second width δ = 2L of the compression assembly according to the first embodiment of the present disclosure, the second width of the compression assembly according to the second embodiment of the present disclosure is larger. Specifically, the width of the gap g1 can be equal to the minimum width L that can be achieved under the processing conditions, and the width of the gap g2 is greater than the width of the gap g1 and thus greater than the minimum width L. Therefore, the second width of the compression assembly according to the second embodiment of the present disclosure is greater than 2L. Thus, by increasing the width of the second gap, the fitting relationship between the fixed scroll 30, the guide ring 70, and the positioning pin 80a satisfies the following relational expression:

[0053] Δ / H < δ / h.

[0054] Thus, when the fixed scroll overturns, the fixed scroll first contacts the guide ring, thereby avoiding applying a significantly increased stress to the positioning pin and preventing the positioning pin from being damaged or having a reduced connection strength due to excessive stress and overturning moment. Specifically, when the fixed scroll overturns, both sides of the fixed scroll 30 contact the guide ring 70, and thus the fixed scroll 30 generates an overturning moment acting on the guide ring 70. On the other hand, as Figure 13b shown, the positioning pin 80a only contacts the fixed scroll 30 on the first side with a smaller gap and remains separated from the fixed scroll on the second side with a larger gap. Therefore, the fixed scroll 30 does not generate an overturning moment on the positioning pin 80a, thereby preventing the overturning fixed scroll 30 from applying a significantly increased stress to the positioning pin 80a.

[0055] In the compression assembly according to the second embodiment of the present disclosure, since only the second width δ is increased without reducing the second length h, the positioning pin according to the second embodiment of the present disclosure can have a greater length, thereby reducing the contact stress between the positioning pin and the orifice and the resulting wear. Specifically, as described above, when the fixed scroll operates normally, on the first side with a smaller gap g1, the positioning pin contacts the orifice and thereby generates contact stress and wear of the positioning pin. By extending the contact length between the positioning pin and the fixed scroll, the contact stress and the resulting wear can be reduced. Hereinafter, the side where the positioning pin contacts the fixed scroll during normal operation is referred to as the load-bearing side (i.e., Figure 12 the left side in Figure 12 ), and the side where the positioning pin does not contact the fixed scroll during normal operation is referred to as the non-load-bearing side (i.e.,

[0056] the right side in

[0057] Exemplary embodiments of the scroll compressor according to the present disclosure have been shown and described above. As described above, the inventors of the present disclosure found through repeated research that by adjusting the cooperation mode between the fixed scroll, the positioning pin, and the guide ring, the problem of the positioning pin being damaged due to excessive stress and thus affecting the performance of the compressor can be effectively reduced. Specifically, by making the cooperation relationship between the fixed scroll 30, the guide ring 70, and the positioning pin 80a satisfy the relational expression: Δ / H < δ / h, the above technical problem can be effectively solved. Although the preferred embodiments of the present invention have been described in detail above, it should be understood that the present invention is not limited to the specific embodiments described and shown in detail here. Other variations and modifications can be implemented by those skilled in the art without departing from the essence and scope of the present invention. For example, those skilled in the art can conceive of setting the axial dimension of the guide ring to be greater than or equal to one-half of the axial dimension of the fixed scroll of the fixed scroll, so as to increase the first length H, thereby enabling the positioning pin to maintain effective and reliable positioning of the fixed scroll. It can be understood that all variations and modifications without departing from the essence and scope of the present invention fall within the scope of the present invention. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A scroll compressor, comprising: A scroll assembly configured to compress a working fluid and including a stationary scroll (30) provided with an orifice (36); A guide ring (70) configured to restrict radial movement of the stationary scroll and guide axial movement of the stationary scroll. The stationary scroll includes a first section (33) in clearance fit with the inner side of the guide ring. The guide ring includes a second section (72) opposed to the first section (33). The first section has a first length H extending in the axial direction. The difference between the inner diameter of the second section (72) and the outer diameter of the first section (33) is a first width Δ; A main bearing housing configured to support the scroll assembly and provided with a pin hole; and A positioning pin (80) fixedly disposed in the pin hole of the main bearing housing. The positioning pin includes a third section (82) in clearance fit with the orifice (36) of the stationary scroll. The wall of the orifice includes a fourth section (362) opposed to the third section. The third section (82) has a second length h extending in the axial direction. The fourth section (362) has an orifice width d2 extending in the circumferential direction. The third section (82) has a pin width d1 extending in the circumferential direction. The difference between the orifice width d2 and the pin width d1 is a second width δ, The ratio of the first width Δ to the first length H is less than the ratio of the second width δ to the second length h.

2. The scroll compressor according to claim 1, wherein The stationary scroll includes a flange (34) radially extending outward from the stationary scroll body, and the orifice is a notch formed in the flange.

3. The scroll compressor according to claim 1, wherein The positioning pin is eccentrically arranged in the orifice.

4. The scroll compressor according to claim 1, wherein The center of the pin hole of the main bearing housing (50a) is not aligned with the center of the orifice (36) of the stationary scroll (30).

5. The scroll compressor according to claim 1, wherein The positioning pin (80a) is in interference fit with the pin hole of the main bearing housing.

6. The scroll compressor according to any one of claims 1 to 5, wherein The scroll compressor further includes a housing (10), and the guide ring (70) is disposed between the housing and the stationary scroll.

7. A scroll compressor, comprising: A scroll assembly configured to compress a working fluid and including a stationary scroll (30) provided with an orifice (36); A guide ring (70) configured to restrict radial movement of the stationary scroll and guide axial movement of the stationary scroll. The stationary scroll includes a first section (33) in clearance fit with the inner side of the guide ring. The guide ring includes a second section (72) opposed to the first section (33). The first section has a first length H extending in the axial direction. The difference between the inner diameter of the second section (72) and the outer diameter of the first section (33) is a first width Δ; A main bearing housing (50a) for supporting the scroll assembly and provided with a pin hole; and A positioning pin (80), the positioning pin including a third section (82) that is in clearance fit with the pin hole of the main bearing housing, the wall of the pin hole including a fourth section (362) opposed to the third section, the third section (82) having a second length h extending in the axial direction, the fourth section (362) having a hole width d2 extending in the circumferential direction, the third section (82) having a pin width d1 extending in the circumferential direction, and the difference between the hole width d2 and the pin width d1 being a second width δ, The ratio of the first width Δ to the first length H is less than the ratio of the second width δ to the second length h.

8. The scroll compressor according to claim 7, wherein The positioning pin is eccentrically arranged in the pin hole.

9. The scroll compressor according to claim 7, wherein The positioning pin (80a) is in interference fit with the orifice (36) of the fixed scroll.

10. The scroll compressor according to claim 7, wherein The scroll assembly further includes an orbiting scroll, and the pin hole and the orifice are positioned such that the positioning pin is located radially outside the orbiting scroll.

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