Compressor and installation method thereof

Abstract

The invention discloses a compressor and an installation method thereof. A compressor includes a backlash compensation element between an orbiting scroll and an intermediate disc, a backside, the backlash compensation element and the intermediate disc defining a backpressure chamber, the backlash compensation element being configured as a sheet and having a first end facing the backside and a second end facing the intermediate disc, where the sheet is configured to be deformable, and the backlash compensation element having a first end facing the backlash chamber and a second end facing the intermediate disc. And a restoring force resulting from the deformation maintains the first end and the back side in contact, the backlash compensation element further comprising a first contact portion protruding from the sheet at the second end to abut against the intermediate disc. According to the present application, the clearance between the back side of the orbiting scroll and the intermediate disc is controlled by the clearance compensation element to maintain the back pressure in the back pressure chamber.

Description

Technical Field

[0001] The present application relates to a compressor in which a refrigerant is pressurized and a method for installing the compressor. Background Art

[0002] A movable scroll and a fixed scroll are provided in a scroll compressor. The movable scroll is driven by an eccentric shaft to revolve relative to the fixed fixed scroll without rotating, thereby forming a compression chamber for compressing the fluid between the movable scroll and the fixed scroll. The movable scroll has a back pressure chamber on the side opposite to the fixed scroll. The pressure of the compression chamber applies a compression thrust to the movable scroll, and the pressure of the back pressure chamber applies a back pressure thrust to the movable scroll. During the operation of the compressor, the pressure of the compression chamber and the pressure of the back pressure chamber are respectively dynamically changed. When there is a difference in the size of the compression thrust and the back pressure thrust, thrust imbalance occurs. For example, when the compression thrust is greater than the back pressure thrust, the end of the movable scroll will be out of contact with the fixed scroll and leak the compressed fluid. The working efficiency of the compressor is reduced. For another example, when the compression thrust is less than the back pressure thrust, the movable scroll will be pushed by the back pressure thrust so that the end of the movable scroll is close to the fixed scroll. When the compression thrust is much less than the back pressure thrust, the friction between the movable scroll and the fixed scroll is too large. The efficiency of the compressor will also be reduced.

[0003] The following methods are usually used to maintain close contact between the movable scroll and the root of the fixed scroll (also known as the fixed base plate) to control the leakage caused by the axial gap. One way is to provide a seal on the end face of the movable scroll, which can float between the end face of the movable scroll and the root of the fixed scroll to compensate for the gap. Another method is to introduce the high-pressure refrigerant flow channel from the compression chamber or the discharge chamber to the back side of the movable scroll. The back pressure pushes the movable scroll toward the fixed scroll to achieve a balance between the back pressure chamber and the compression chamber, which can also control the gap on the movable scroll, thereby reducing leakage at the gap. In order to maintain the pressure level in the back pressure chamber, the gap between the movable scroll and the intermediate disk opposite to the movable scroll needs to be controlled.

[0004] For this purpose, there are the following arrangements to compensate. One compensation arrangement is to cut a groove on the back side, into which an O-ring and another slip ring made of a material such as PTFE or PEEK are placed. During the installation of the compressor, the O-ring is squeezed, and the restoring force generated by the squeezing pushes the slip ring against the wear plate on the intermediate disk, thereby compensating the gap between the back side and the intermediate disk.

[0005] Another compensation arrangement is to make a groove on the intermediate disk and put the O-ring into the groove. The wear plate is placed on the O-ring. During the installation of the compressor, the back side contacts the wear plate and squeezes the O-ring, thereby obtaining a reverse elastic force, that is, the O-ring and the wear plate together compensate for the gap.

[0006] Another compensation arrangement is to provide steps on the radial inner side and radial outer side of the intermediate disk, respectively, and form a protrusion on the intermediate disk between the two steps, and the wear-resistant sheet is arranged on the intermediate disk. Above the protrusion is the contact area between the back side and the wear-resistant sheet. During the installation of the compressor, the back side applies pressure on the wear-resistant sheet to bend the wear-resistant sheet, thereby obtaining the reverse elastic force of the sheet, thereby performing gap compensation.

[0007] Regardless of the compensation arrangement, multiple additional parts are required, which complicates the installation steps and increases costs. Summary of the invention

[0008] One aspect of the present application is to provide a compressor that is optimized in terms of manufacturing and cost.

[0009] The compressor includes a fixed scroll having a fixed base plate and a fixed vortex wall, the fixed vortex wall extending in a circumferential direction from an axis in a manner away from the axis; a movable scroll movable relative to the fixed scroll, the movable scroll having a movable base plate and a movable vortex wall, the movable scroll being positioned so that the movable base plate is opposite to the fixed base plate, the movable vortex wall has an end surface to contact with the fixed base plate and the movable vortex wall is meshed with the fixed vortex wall, the movable base plate has a back side away from the end surface of the movable vortex wall; an intermediate disk opposite to the back side; and a gap compensation element between the movable scroll and the intermediate disk, the back side, the gap compensation element and the intermediate disk defining a back pressure chamber, the gap compensation element being configured as a sheet and having a first end facing the back side and a second end facing the intermediate disk, wherein the sheet is configured to be deformable, and a restoring force generated by the deformation keeps the first end and the back side in contact, and the gap compensation element also includes a first contact portion protruding from the sheet at the second end to abut against the intermediate disk.

[0010] In an embodiment of the compressor, the sheet and the first contact portion are combined into a one-piece component.

[0011] In one embodiment of the compressor, the one-piece component is a metal stamping part or an injection-molded part, wherein the injection-molded part is made of POM, PTFE, PEEK, or PPS.

[0012] In an embodiment of the compressor, the first end is configured as a flat surface, and the first contact portion is configured as at least one annular rib.

[0013] In an embodiment of the compressor, the first end has an anti-friction surface.

[0014] In an embodiment of the compressor, the plate has a plurality of holes through which anti-rotation pins pass, and the ribs are arranged at any radial position between the peripheral edge of the plate and the holes.

[0015] In an embodiment of the compressor, the ribs include first ribs and / or second ribs, wherein the first ribs are arranged at the peripheral edge of the sheet, and the second ribs are arranged radially outside the hole.

[0016] In one embodiment of the compressor, the sheet radially extends to between the outer peripheral flange of the fixed scroll and the intermediate disk, and the rib is arranged at any radial position between the outer peripheral flange and the movable scroll.

[0017] Another aspect of the present application is to provide a method for installing a compressor, the method comprising providing a gap compensation element between the back side of the movable scroll and the intermediate disk to define a back pressure chamber, the gap compensation element being constructed as a sheet and having a first end facing the back side and a second end facing the intermediate disk, the gap compensation element also comprising a first contact portion protruding from the sheet at the second end; the movable scroll applies a prestress to the intermediate disk to bend the sheet, a restoring force opposite to the prestress keeps the first end and the back side in contact, and the first contact portion abuts against the intermediate disk.

[0018] In one embodiment of the method, the first contact portion is at least one annular rib bonded to the sheet.

[0019] The present application controls the gap between the back side of the movable scroll and the middle disk through a gap compensation element to maintain the back pressure in the back pressure chamber. No additional processing is required for the movable scroll or the middle disk, thus eliminating the installation step and saving costs. The gap compensation element is provided in the form of a sheet, which is a flat pad as a whole, and it is easy to form a first contact portion on the sheet to contact the middle disk after the sheet is installed in place. Through the structural design of the sheet and the first contact portion, after the main body of the gap compensation element is deformed, a suitable reverse force can be provided in a timely and permanent manner to contact both the back side of the movable scroll and the middle disk, thereby eliminating the gap between the two, thereby avoiding pressure leakage in the back pressure chamber.

[0020] Other aspects and features of the present application will become apparent from the following detailed description with reference to the accompanying drawings. It should be understood, however, that the drawings are designed for illustrative purposes only and are not intended to limit the scope of the present application, as reference should be made to the appended claims. It should also be understood that the drawings are intended only to conceptually illustrate the structures and processes described herein and, unless otherwise indicated, are not necessarily drawn to scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present application will be more fully understood by referring to the following detailed description of specific embodiments in conjunction with the accompanying drawings, in which the same reference numerals in the drawings always refer to the same elements in the drawings.

[0022] Figure 1 A cross-sectional view of an embodiment of a compressor involved in the present application;

[0023] Figure 2a -c is a schematic diagram of a first embodiment of a gap compensation element of a compressor involved in the present application;

[0024] Figure 3a -c is a schematic diagram of a second embodiment of a gap compensation element of a compressor involved in the present application;

[0025] Figure 4a -c is a schematic diagram of a third embodiment of the gap compensation element of the compressor involved in the present application;

[0026] Figure 5 It is a schematic diagram of a fourth embodiment of a clearance compensation element of a compressor involved in the present application. DETAILED DESCRIPTION

[0027] In order to help those skilled in the art to accurately understand the subject matter for which protection is sought in the present application, the specific implementation of the present application is described in detail below in conjunction with the accompanying drawings.

[0028] Figure 1 The cross-sectional schematic diagram of an embodiment of a compressor involved in the present application. The compressor comprises a housing (not shown), and the housing defines a receiving cavity. Figure 1 The internal structure of the compressor with the casing removed is shown. The compressor further includes a fixed scroll 12, an intermediate disk 22, a main shaft 40 and a movable scroll 24. The fixed scroll 12 and the intermediate disk 22 are respectively fixed in the receiving cavity and are opposite to each other. The fixed scroll 12 has an integral fixed base plate 14 and a fixed scroll wall 16. The fixed scroll wall 16 extends from a position close to the axis X" of the fixed scroll 12 around the axis in a direction away from the axis X". A discharge port 20 is provided at the center of the fixed base plate 14. The movable scroll 24 is installed between the fixed scroll 12 and the intermediate disk 22. The movable scroll 24 has an integral movable base plate 26 and a movable scroll wall 28. The movable scroll wall 28 extends from a position close to the axis X' of the movable scroll 24 around the axis in a direction away from the axis X'. The axis X' of the movable scroll 24 is offset from the axis X" of the fixed scroll 12.

[0029] The movable volute 28 has an end face 32 and two side faces 34. The side faces 34 of the movable volute 28 are substantially parallel to the axial direction. The side faces 34 of the movable volute 28 mesh with the side faces 17 of the stationary volute 16, and the end faces 32 of the movable volute 28 are in sliding contact with the stationary base plate 14. A compression chamber 36 is formed between the movable scroll 24 and the stationary scroll 12, and the compression chamber 36 is connected to the discharge port 20. A back pressure chamber 38 is formed between the back side 30 of the movable scroll 24 and the intermediate disk 22. A suction chamber not shown is also provided in the housing. The suction chamber is connected to the space outside the movable scroll 24 and the stationary scroll 12. When the motor main shaft 40 of the compressor rotates around the axis X, the movable scroll 24 eccentrically arranged on the main shaft 40 is driven to rotate relative to the fixed scroll 12, and the refrigerant fluid is sucked from the periphery of the movable scroll 24 and the fixed scroll 12 into the compression chamber 36 between the movable scroll 24 and the fixed scroll 12. As the compressor rotates, the compression chamber 36 moves from the periphery to the center and the volume gradually decreases. The refrigerant in the compression chamber 36 is gradually pressurized, and finally the high-pressure refrigerant fluid is discharged from the discharge port 20 at the center of the movable scroll 24 and the fixed scroll 12. This cycle is repeated to achieve continuous vortex compression. It can be seen that the pressure of the refrigerant in the compression chamber is dynamically variable, and the pressure of the refrigerant in the compression chamber usually increases gradually from the periphery to the center.

[0030] The compression chamber 36 and the back pressure chamber 38 provide opposite thrusts to the orbiting scroll 24. Figure 1 As shown, the refrigerant in the compression chamber 36 applies pressure to the movable scroll 24 from top to bottom, and the fluid in the back pressure chamber 38 applies pressure to the movable scroll 24 from bottom to top. The movable scroll 24 contacts the fixed scroll 12 under the back pressure to prevent refrigerant leakage. When the pressure in the compression chamber 36 is too large to cause the movable scroll 24 to move downward away from the fixed scroll 12, the back pressure can push the movable scroll 24 back until the pressure on both sides of the movable scroll 24 reaches equilibrium.

[0031] A clearance compensation element 50 is also provided between the back side 30 of the orbiting scroll 24 and the intermediate disk 22. The back pressure chamber 38 is defined by the back side 30, the clearance compensation element 50, and the intermediate disk 22. Figure 2a -c, Figure 2a -c is a schematic diagram of a first embodiment of a gap compensation element of a compressor involved in the present application, wherein Figure 2a Shown is a clearance compensation element installed in a compressor. Figure 2b Shown as Figure 2a A partial enlarged view of the mid-gap compensation element. Figure 2c for Figure 2a Schematic diagram of the gap compensation element in FIG. Combining these three figures, the gap compensation element 50 is an integral flat washer structure provided in the form of a sheet 52, which has a first end 56 and a second end 60 in the axial direction ( Figure 2b). The first end 56 faces the back side 30 of the movable scroll 24, and the second end 60 faces the intermediate disk 22. The sheet 52 is deformable, and the restoring force generated by the sheet 52 after deformation makes the sheet 52 between the back side 30 and the intermediate disk 22, and its first end 56 is kept in contact with the back side 30. The clearance compensation element 50 also has a first contact portion 54 protruding from the second end 60 toward the intermediate disk 22. The first contact portion 54 is configured to abut against the intermediate disk 22.

[0032] The first contact portion 54 and the sheet 52 are combined into an integral part. The gap compensation element 50 can be a metal part, and the sheet 52 and the first contact portion 54 are formed at one time by a stamping process. Because it is a thin sheet, the metal part has a certain elasticity. Under pressure, the restoring force generated by the deformation of the metal part can thus contact the back side 30 of the movable scroll 24 and the intermediate disk 22 at the same time. The gap compensation element 50 can also be made of a polymer material, such as POM (polyoxymethylene), PTFE (Teflon, also known as polytetrafluoroethylene), PEEK (polyetheretherketone), or PPS (polyphenylene sulfide), etc., and is formed by injection molding. The gap compensation element 50 made of these materials also has a certain elasticity. Therefore, it can also rely on the elastic restoring force to contact the back side 30 of the movable scroll 24 and the intermediate disk 22 at the same time under pressure.

[0033] The first contact portion 54 is as follows Figure 2a -c is formed as an annular rib 62 on the sheet 52. The rib 62 has a roughly triangular cross section. The rib 62 may also have other cross sections, and the contact area between the rib cross sections and the intermediate disk will be different, so the sealing of the back pressure chamber can be adjusted by designing the cross section of the rib. Adjusting the number of ribs can also adjust the sealing of the back pressure chamber to different degrees. Figure 2a In the embodiment shown in FIG. 5C , the first contact portion 54 has a first rib 64 .

[0034] The first end 56 has a flat surface 57 that contacts the back side of the movable scroll. The movable scroll 24 moves relative to the first end 56, so the first end 56 has a large contact area, and the surface of the contact area is configured to be anti-friction to have wear resistance.

[0035] In the illustrated embodiment, the gap compensation element 50 includes a plurality of holes 68 around its axis for passing the anti-rotation pin. The first contact portion 54 is disposed at any radial position between the peripheral edge 70 of the sheet 52 and the holes 68. As shown in the figure, the first rib 64 is located at the peripheral edge 70 of the sheet 52.

[0036] The gap compensation element 50 can be a metal stamping part or an injection molded part. Figure 2a-c shows a gap compensation element made of metal. After stamping, the first rib 64 protrudes from the second end 60 and is slightly concave at the first end 56. When the gap compensation element 50 is an injection molded part, the flat surface 57 of the first end 56 can extend to the edge of the sheet 52.

[0037] When the compressor is installed, the movable scroll is pressed with a very small force F to deform the gap compensation element 50. The radially inward area of ​​the first contact portion 54 is bent, and the corresponding restoring force F1 reacts on the movable scroll 24 in the axial direction, thereby ensuring that the first end 56 is in contact with the back side 30, while the first rib 64 abuts against the intermediate disk 22 and thus maintains contact. Thereby, the gap between the back side 30 and the intermediate disk 22 is eliminated, and the risk of back pressure leakage is controlled.

[0038] Figure 3a -c is a schematic diagram of a second embodiment of the gap compensation element of the compressor involved in the present application, wherein Figure 3a Shown is a clearance compensation element installed in a compressor. Figure 3b Shown as Figure 3a A partial enlarged view of the mid-gap compensation element. Figure 3c for Figure 3a Schematic diagram of the gap compensation element. The gap compensation element is the same as the first embodiment, except for the position of the first contact portion. The same parts are not repeated here. The rib 62 is located radially outside the hole 68 at the second end 60 and is adjacent to the hole 68. The rib 62 is a second rib 66. Figure 3a -c shows a gap compensation element made of plastic, the second rib 66 being formed on the sheet by injection molding.

[0039] When the compressor is installed, a very small force F is applied to the movable scroll, and the clearance compensation element 50 bends at the radially outward area of ​​the first contact portion 54. The corresponding restoring force F1 makes the first end 56 contact the back side 30, and the second rib 66 abuts against the intermediate disk 22, and the gap between the back side 30 and the intermediate disk 22 is eliminated.

[0040] Figure 4a -c is a schematic diagram of a third embodiment of the gap compensation element of the compressor involved in the present application, wherein Figure 4a Shown is a clearance compensation element installed in a compressor. Figure 4b Shown as Figure 4a A partial enlarged view of the mid-gap compensation element. Figure 4c for Figure 4a Schematic diagram of the gap compensation element. The gap compensation element is a combination of the first embodiment and the second embodiment. The second end 60 has two ribs 62, namely a first rib 64 and a second rib 66, which are respectively located radially outside the hole 68 and at the peripheral edge 70 of the sheet. Figure 4a-c shows a gap compensation element made of a metal material. The surface of the first end 56 between the first rib 64 and the second rib 66 is an area in contact with the back side 30 .

[0041] When the compressor is installed, a very small force F is applied to the movable scroll, and the clearance compensation element is bent between the first rib 64 and the second rib 66. The resulting restoring force F1 causes the surface of the first end 56 to contact the back side 30. At the same time, the first rib 64 and the second rib 66 are both pressed against the intermediate disk 22, and the clearance between the back side 30 and the intermediate disk 22 is eliminated.

[0042] Figure 5 The schematic diagram of the fourth embodiment of the gap compensation element of the compressor involved in the present application is shown. Different from the first three embodiments, the gap compensation element eliminates the hole and extends radially to between the outer peripheral flange 18 of the fixed scroll 12 and the intermediate disk 22. The gap compensation element 50 is positioned by means of the larger friction force between the fixed scroll 12 and the intermediate disk 22. In this embodiment, the first contact portion 54 is arranged at any radial position between the movable scroll 24 and the outer peripheral flange 18 of the fixed scroll 12.

[0043] When the compressor is installed, a very small force F is applied to the movable scroll. Similar to the first embodiment, the gap compensation element bends radially inwardly on the first contact portion 54. The generated restoring force F1 causes the first end to contact the back side. At the same time, the first contact portion 54 abuts against the intermediate disk 22, thereby eliminating the gap between the back side 30 and the intermediate disk 22.

[0044] Although specific embodiments of the present application have been shown and described in detail to illustrate the principles of the present application, it should be understood that the present application can be implemented in other ways without departing from such principles.

Claims

1. A compressor, characterized in that include: A stationary scroll (12), wherein the stationary scroll (12) has a stationary base plate (14) and a stationary scroll wall (16), wherein the stationary scroll wall (16) extends in a circumferential direction from an axis in a manner away from the axis; a movable scroll (24) movable relative to the fixed scroll (12), the movable scroll (24) having a movable base plate (26) and a movable volute wall (28), the movable scroll (24) being positioned such that the movable base plate (26) is opposite to the fixed base plate (14), the movable volute wall (28) having an end surface (32) for contacting the fixed base plate (14) and the movable volute wall (28) meshing with the fixed volute wall (16), and the movable base plate (26) having a back side (30) away from the end surface (32) of the movable volute wall (28); an intermediate disk (22) opposite the back side (30); and A gap compensating element (50) is provided between the movable scroll (24) and the intermediate disk (22), wherein the back side (30), the gap compensating element (50) and the intermediate disk (22) define a back pressure chamber (38), wherein the gap compensating element (50) is configured as a sheet (52) and has a first end (56) facing the back side (30) and a second end (60) facing the intermediate disk (22), wherein the sheet (52) is configured to be deformable, and a restoring force generated by the deformation keeps the first end (56) and the back side (30) in contact, and the gap compensating element (50) further includes a first contact portion (54) protruding from the sheet (52) at the second end (60) to abut against the intermediate disk (22).

2. The compressor according to claim 1, characterized in that: The sheet (52) and the first contact portion (54) are combined as a one-piece component.

3. The compressor according to claim 2, characterized in that: The one-piece component is a metal stamping part or an injection-molded part, wherein the injection-molded part is made of POM, PTFE, PEEK, or PPS.

4. The compressor according to claim 1, characterized in that: The first end (56) is configured as a flat surface (57), and the first contact portion (54) is configured as at least one annular rib (62).

5. The compressor according to claim 1, characterized in that: The first end (56) has an anti-friction surface.

6. The compressor according to claim 4, characterized in that: The sheet (52) has a plurality of holes (68) through which anti-rotation pins pass, and the ribs (62) are arranged at any radial position between the peripheral edge (70) of the sheet (52) and the holes (68).

7. The compressor according to claim 6, characterized in that: The ribs (62) include first ribs (64) and / or second ribs (66), wherein the first ribs (64) are arranged at the peripheral edge (70) of the sheet (52), and the second ribs (66) are arranged radially outside the hole (68).

8. The compressor according to claim 1, characterized in that: The sheet (52) radially extends to between the outer peripheral flange (18) of the fixed scroll (12) and the intermediate disk (22), and the first contact portion (54) is arranged at any radial position between the outer peripheral flange (18) and the movable scroll (24).

9. A method for installing a compressor, characterized in that include: A clearance compensation element (50) is provided between the back side (30) of the movable scroll (24) and the intermediate disk (22) to define a back pressure chamber (38), the clearance compensation element (50) being configured as a sheet (52) and having a first end (56) facing the back side (30) and a second end (60) facing the intermediate disk (22), the clearance compensation element (50) further comprising a first contact portion (54) protruding from the sheet (52) at the second end (60); The movable scroll (24) applies prestress to the intermediate disk (22) to bend the sheet (52), and a restoring force opposite to the prestress keeps the first end (56) and the back side (30) in contact while the first contact portion (54) abuts against the intermediate disk (22).

10. The installation method according to claim 9, characterized in that: The first contact portion (54) is at least one annular rib (62) coupled to the sheet (52).

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