Scroll compressor and heat exchanger

Abstract

The application provides a scroll compressor and a heat exchanger, the scroll compressor comprising a casing, a motor, a crankshaft, a static scroll disc, a dynamic scroll disc, a support rod and a balance block, the crankshaft comprising a main shaft and an eccentric shaft, the eccentric shaft being arranged at an axial upper end of the main shaft and being eccentric to the main shaft, the support rod extending in the axial direction of the main shaft and being connected between the static scroll disc and a base of the casing, a shaft through hole of the crankshaft being sleeved on the support rod, the shaft through hole being arranged through the main shaft and the eccentric shaft along the axial line of the main shaft, the shaft through hole corresponding to the main shaft being rotatably supported on the support rod through a second bearing, and the balance block being sleeved on the main shaft and being arranged close to the eccentric shaft. The scroll compressor can effectively reduce the axial height of the main shaft, and the crankshaft has good rotation stability. Meanwhile, the structure of the scroll compressor is simplified, the number of parts is small, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology, and in particular to a scroll compressor and a heat exchanger having the scroll compressor. Background Technology

[0002] To stably support the crankshaft, existing scroll compressors have upper and lower support seats inside their housings, allowing the crankshaft to be rotatably supported at its upper and lower axial ends, respectively. Because the upper and lower support seats are located at the upper and lower axial ends of the crankshaft, the axial height of the scroll compressor housing must be increased to accommodate them, thus increasing the overall axial height of the scroll compressor on the crankshaft.

[0003] In addition, to ensure the balance of crankshaft rotation, multiple balance weights need to be fitted onto the crankshaft that is rotatably supported between the upper and lower support seats, and the size of the balance weights needs to be designed to be larger, which leads to increased production costs. Summary of the Invention

[0004] The primary objective of this invention is to provide a scroll compressor that can effectively reduce axial height, improve crankshaft rotational smoothness, simplify structure, reduce the number of parts, and lower production costs.

[0005] A second objective of the present invention is to provide a heat exchanger for the aforementioned scroll compressor.

[0006] To achieve the first objective of this invention, the present invention provides a scroll compressor, comprising a housing, a motor, a crankshaft, a stationary scroll, a moving scroll, a support rod, and a counterweight. The motor, crankshaft, stationary scroll, and moving scroll are respectively disposed within the housing. The crankshaft includes a main shaft and an eccentric shaft. The eccentric shaft is disposed at the upper axial end of the main shaft and is eccentrically positioned to the main shaft. The rotor of the motor is sleeved on the main shaft and drives the main shaft to rotate around its own axis. The moving scroll is sleeved on the eccentric shaft via a first bearing. The stationary scroll is located above the moving scroll in the axial direction of the main shaft and forms a compression chamber with the moving scroll. The support rod extends in the axial direction of the main shaft and connects between the stationary scroll and the base of the housing. The shaft through-hole of the crankshaft is sleeved on the support rod. The shaft through-hole is disposed along the axis of the main shaft and penetrates the main shaft and the eccentric shaft. The shaft through-hole corresponding to the main shaft is rotatably supported on the support rod via a second bearing. The counterweight is sleeved on the main shaft and disposed close to the eccentric shaft.

[0007] As can be seen from the above scheme, during the operation of the scroll compressor of the present invention, the motor drives the crankshaft main shaft to rotate around its own axis through its rotor. Since the crankshaft and the main shaft are rotatably supported on the support rod through the second bearing, the crankshaft main shaft rotates around the support rod, which simultaneously drives the eccentric shaft of the crankshaft to rotate eccentrically, thereby driving the moving scroll disk set on the eccentric shaft to perform translational motion around the axis of the main shaft with a fixed radius, thereby compressing the refrigerant in the compression chamber formed between the stationary scroll disk and the moving scroll disk.

[0008] This invention relates to a scroll compressor that utilizes a support rod to support the crankshaft. Specifically, the crankshaft's through-hole is fitted onto the support rod, and this through-hole extends along the axis of the main shaft, passing through both the main shaft and the eccentric shaft. The through-hole corresponding to the main shaft is rotatably supported on the support rod via a second bearing. This ensures the coaxiality of the crankshaft and its rotating components is guaranteed by a single component, thereby guaranteeing the coaxiality of all rotating parts. Furthermore, only a small-sized balance weight is needed to improve the smoothness of crankshaft rotation. Simultaneously, the support rod of this invention extends axially along the main shaft and connects between the stationary scroll plate and the base of the casing. The top of the support rod connects to the stationary scroll plate, facilitating easier adjustment of the coaxiality between the stationary scroll plate and the crankshaft's main shaft. Furthermore, the scroll compressor of the present invention can stably support the crankshaft movement with only one support rod. Compared with the existing scroll compressors which have upper and lower support seats at the upper and lower ends of the crankshaft respectively, the crankshaft of the scroll compressor of the present invention is sleeved on the support rod through its shaft through hole. There is no need to set additional support seats at the upper and lower ends of the crankshaft, which can effectively reduce the axial height of the scroll compressor as a whole in the crankshaft axial direction. The structure is simplified, the number of parts is reduced, and the various parts of the scroll compressor are easier to process, manufacture and assemble, thereby reducing production costs.

[0009] A preferred embodiment is that the top of the support rod extends through the static vortex disk and connects to the top cover of the housing.

[0010] A further proposed solution is to have a first countersunk hole on the inner end face of the top cover, into which the top end of the support rod is inserted.

[0011] A further solution is to provide a second countersunk hole on the inner end face of the base, and insert the bottom end of the support rod into the second countersunk hole.

[0012] A further proposed solution is to have at least two second bearings, with multiple second bearings arranged axially on the support rod and connected between the shaft through hole corresponding to the main shaft and the support rod.

[0013] A further embodiment is that the scroll compressor also includes a moving disc limiting plate, which is located below the stationary scroll in the axial direction of the main shaft. The upper end face of the moving disc limiting plate is provided with a first limiting groove, and a limiting cavity is formed between the first limiting groove and the lower end face of the stationary scroll. The annular part of the moving scroll is located in the limiting cavity, and the limiting cavity restricts the movement of the annular part in the axial direction of the main shaft.

[0014] A further embodiment is that the scroll compressor also includes a limiting slip ring. The bottom surface of the first limiting groove is provided with a second limiting groove. The limiting slip ring can be moved radially in the second limiting groove. The lower end surface of the ring disc is provided with a first sliding groove that extends radially in the support rod. The upper end surface of the limiting slip ring is provided with an upper convex key that can be moved radially in the support rod and is located in the first sliding groove.

[0015] A further solution is that the bottom surface of the second limiting groove is provided with a second sliding groove, which extends radially in the support rod. The lower end face of the limiting slip ring is provided with a lower convex key, which can be moved radially in the support rod and is located in the second sliding groove. The lower convex key and the upper convex key are offset from each other in the circumferential direction of the support rod.

[0016] A further embodiment is that the scroll compressor also includes a sealing ring, which is set in the shaft hole of the moving scroll and rotatably fitted on the support rod. The sealing ring is located between the eccentric shaft and the stationary scroll to seal the gap between the shaft through hole and the support rod.

[0017] To achieve the second objective of the present invention, the present invention provides a heat exchanger including a scroll compressor, wherein the scroll compressor is the scroll compressor described above. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the first embodiment of the scroll compressor of the present invention.

[0019] Figure 2 yes Figure 1 Enlarged view at point A.

[0020] Figure 3 yes Figure 1 Enlarged view at point B.

[0021] Figure 4 This is an exploded view of the first embodiment of the scroll compressor of the present invention.

[0022] Figure 5 This is a structural diagram of the crankshaft in the first embodiment of the scroll compressor of the present invention.

[0023] Figure 6 This is a cross-sectional view of the crankshaft in the first embodiment of the scroll compressor of the present invention.

[0024] Figure 7This is a cross-sectional view of the second embodiment of the scroll compressor of the present invention.

[0025] Figure 8 yes Figure 7 Enlarged view at point C.

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0027] First embodiment of a scroll compressor:

[0028] See Figures 1 to 6 This embodiment discloses a scroll compressor 10, including a housing 11, a motor 12, a crankshaft 13, a stationary scroll 18, a moving scroll 17, a support rod 16, and a balance block 15. The motor 12, crankshaft 13, stationary scroll 18, and moving scroll 17 are respectively disposed within the housing 11. The crankshaft 13 includes a main shaft 131 and an eccentric shaft 132. The eccentric shaft 132 is disposed at the upper axial end of the main shaft 131 and is eccentrically disposed to the main shaft 131. Meanwhile, in this embodiment, the rotor 121 of the motor 12 is sleeved on the main shaft 131 and drives the main shaft 131 to rotate around its own axis. The moving scroll 17 is sleeved on the eccentric shaft 132 through a first bearing 114. The stationary scroll 18 is located axially above the moving scroll 17 on the main shaft 131 and forms a compression chamber (not shown) between the stationary scroll 18 and the moving scroll 17. Furthermore, in this embodiment, the support rod 16 extends axially along the main shaft 131 and connects between the stationary scroll plate 18 and the base 112 of the housing 11. The shaft through hole 133 of the crankshaft 13 is sleeved on the support rod 16. The shaft through hole 133 is arranged to penetrate the main shaft 131 and the eccentric shaft 132 along the axis of the main shaft 131. The shaft through hole 133 corresponding to the main shaft 131 is rotatably supported on the support rod 16 by the second bearing 14. The balance block 15 is sleeved on the main shaft 131 and arranged close to the eccentric shaft 132.

[0029] In this embodiment, during the operation of the scroll compressor 10, the motor 12 drives the main shaft 131 of the crankshaft 13 to rotate around its own axis through its rotor 121. Since the shaft through hole 133 corresponding to the crankshaft 13 and the main shaft 131 is rotatably supported on the support rod 16 through the second bearing 14, the main shaft 131 of the crankshaft 13 rotates around the support rod 16, and simultaneously drives the eccentric shaft 132 of the crankshaft 13 to rotate eccentrically, so as to drive the moving scroll disk 17 arranged on the eccentric shaft 132 to perform translational motion around the axis of the main shaft 131 with a fixed radius, thereby compressing the refrigerant in the compression chamber formed between the stationary scroll disk 18 and the moving scroll disk 17.

[0030] In this embodiment, the scroll compressor 10 uses a support rod 16 to support the crankshaft 13. The shaft through hole 133 of the crankshaft 13 is sleeved on the support rod 16. The shaft through hole 133 is set to pass through the main shaft 131 and the eccentric shaft 132 along the axis of the main shaft 131. The shaft through hole 133 corresponding to the main shaft 131 is rotatably supported on the support rod 16 through the second bearing 14. Thus, the coaxiality of the crankshaft 13 and the rotating parts on the crankshaft 13 is guaranteed by the support rod 16, thereby ensuring the coaxiality of each rotating part. Moreover, only a small-sized balance block 15 is needed to improve the smoothness of the crankshaft 13 rotation. Meanwhile, in this embodiment, the support rod 16 of the scroll compressor 10 extends axially along the main shaft 131 and connects between the stationary scroll plate 18 and the base 112 of the housing 11. The top end of the support rod 16 is connected to the stationary scroll plate 18, making it easier to adjust the coaxiality between the stationary scroll plate 18 and the main shaft 131 of the crankshaft 13. Furthermore, in this embodiment, the scroll compressor 10 only needs one support rod 16 to stably support the movement of the crankshaft 13. Compared with existing scroll compressors that have upper and lower support seats at the upper and lower ends of the crankshaft axial direction respectively, in this embodiment, the crankshaft 13 of the scroll compressor 10 is sleeved on the support rod 16 through its shaft through hole 133. There is no need to set additional support seats at the upper and lower ends of the crankshaft 13 axial direction, thereby effectively reducing the overall axial height of the scroll compressor 10 along the main shaft 131 axial direction. The structure is simplified, the number of parts is reduced, and the various parts of the scroll compressor 10 are easier to process, manufacture, and assemble, thereby reducing production costs.

[0031] To further improve the rotational smoothness of the crankshaft 13, this embodiment uses at least two second bearings 14. Multiple second bearings 14 are arranged axially along the support rod 16 and connected between the shaft through hole 133 corresponding to the main shaft 131 and the support rod 16. Specifically, one second bearing 14 is positioned near the base 112 of the housing 11, and another second bearing 14 is positioned corresponding to the balance block 15.

[0032] To improve the assembly tightness and support stability of the support rod 16, in this embodiment, the top end of the support rod 16 is inserted into the shaft hole of the stationary scroll plate 18, and the inner end face of the base 112 of the housing 11 is provided with a second countersunk hole 1121. The bottom end of the support rod 16 is inserted into the second countersunk hole 1121, thereby ensuring that the support rod 16 stably supports the crankshaft 13 in the axial direction of the main shaft 131, thereby improving the rotational smoothness of the crankshaft 13.

[0033] To improve the working stability and reliability of the stationary scroll plate 18, the scroll compressor 10 in this embodiment also includes a moving plate limiting plate 110. The moving plate limiting plate 110 is located below the stationary scroll plate 18 in the axial direction of the main shaft 131, and a first limiting groove 1101 is provided on the upper end surface of the moving plate limiting plate 110. A limiting cavity (not shown) is formed between the first limiting groove 1101 and the lower end surface of the stationary scroll plate 18. The annular portion 171 of the moving scroll plate 17 is located in the limiting cavity, and the limiting cavity restricts the movement of the annular portion 171 of the moving scroll plate 17 in the axial direction of the main shaft 131.

[0034] Specifically, the scroll compressor 10 in this embodiment also includes a limiting slip ring 113. The bottom surface of the first limiting groove 1101 is provided with a second limiting groove 1102. The limiting slip ring 113 can be moved radially in the second limiting groove 1102. The lower end surface of the annular portion 171 of the moving scroll disk 17 is provided with a first sliding groove 171. The first sliding groove 171 extends radially in the support rod 16. The upper end surface of the limiting slip ring 113 is provided with an upper convex key 1131. The upper convex key 1131 can be moved radially in the first sliding groove 171 in the support rod 16. Under the anti-rotation restriction of the upper convex key 1131, the moving scroll disk 17 performs translational motion around the axis of the main shaft 131 with a fixed radius.

[0035] Furthermore, in this embodiment, the bottom surface of the second limiting groove 1102 is provided with a second sliding groove 1103. The second sliding groove 1103 extends radially in the support rod 16. The lower end face of the limiting slip ring 113 is provided with a lower convex key 1132. The lower convex key 1132 can be moved radially in the second sliding groove 1103. The lower convex key 1132 and the upper convex key 1131 are offset in the circumferential direction of the support rod 16, thereby improving the stability of the moving scroll disk 17 in translational motion around the axis of the main shaft 131 with a fixed radius.

[0036] To prevent the compressed high-pressure refrigerant from flowing into the gap between the shaft through hole 133 and the support rod 16 and affecting the rotational smoothness of the crankshaft 13, the scroll compressor 10 in this embodiment also includes a sealing ring 19. The sealing ring 19 is disposed in the shaft hole of the moving scroll plate 17 and rotatably sleeved on the support rod 16. The sealing ring 19 is located between the eccentric shaft 132 and the stationary scroll plate 18 to seal the gap between the shaft through hole 133 and the support rod 16. Specifically, the sealing ring 19 in this embodiment is preferably made of an elastic material.

[0037] Second embodiment of scroll compressor:

[0038] As an explanation of the second embodiment of the scroll compressor of the present invention, the following description focuses only on the differences from the first embodiment of the scroll compressor.

[0039] See Figure 7 and Figure 8In this embodiment, the top end of the support rod 16' of the scroll compressor 10' extends through the stationary scroll plate 18 and connects to the upper cover 111 of the housing 11. Specifically, in this embodiment, the inner end face of the upper cover 111 of the housing 11 is provided with a first countersunk hole 1111, and the top end of the support rod 16 is inserted into the first countersunk hole 1111, which further improves the assembly tightness and support stability of the support rod 16, and further ensures that the support rod 16 stably supports the crankshaft 13 in the axial direction of the main shaft 131, thereby further improving the rotational smoothness of the crankshaft 13.

[0040] The scroll compressors 10 and 10' of the first and second embodiments can be applied to heat exchangers, including air conditioners, refrigerators, heat pumps, freezers, cold storage, etc.

[0041] The above embodiments are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles of the present invention in accordance with the claims of the present invention should be included in the scope of the present invention patent application.

Claims

1. A scroll compressor comprising a casing, a motor, a crankshaft, a fixed scroll and a movable scroll, the motor, the crankshaft, the fixed scroll and the movable scroll being arranged in the casing respectively, the crankshaft comprising a main shaft and an eccentric shaft arranged at an axial upper end of the main shaft and eccentric to the main shaft; a rotor of the motor is sleeved on the main shaft and drives the main shaft to rotate around an axis of the main shaft, the movable scroll is sleeved on the eccentric shaft through a first bearing, and the fixed scroll is arranged above the movable scroll in an axial direction of the main shaft and forms a compression chamber with the movable scroll; the scroll compressor further comprises a support rod and a balance block, the support rod extends in the axial direction of the main shaft and is connected between the fixed scroll and a base of the casing, an axial through hole of the crankshaft is sleeved on the support rod, the axial through hole is arranged through the main shaft and the eccentric shaft along the axis of the main shaft, the axial through hole corresponding to the main shaft is rotatably supported on the support rod through a second bearing, and the balance block is sleeved on the main shaft and arranged close to the eccentric shaft. 2.The scroll compressor according to claim 1, wherein: a top end of the support rod penetrates through the fixed scroll and is connected with an upper cover of the casing. characterized in that 3.The scroll compressor according to claim 2, wherein: an inner end face of the upper cover is provided with a first counterbore, and the top end of the support rod is inserted into the first counterbore. 4.The scroll compressor according to claim 1, wherein: an inner end face of the base is provided with a second counterbore, and a bottom end of the support rod is inserted into the second counterbore. 5.The scroll compressor according to claim 1, wherein: the number of the second bearings is at least two, and the plurality of second bearings are arranged in the axial direction of the support rod and connected between the axial through hole corresponding to the main shaft and the support rod. 6.The scroll compressor according to claim 1, wherein: the scroll compressor further comprises a movable plate limiting plate, the movable plate limiting plate is arranged below the fixed scroll in the axial direction of the main shaft, an upper end face of the movable plate limiting plate is provided with a first limiting groove, a limiting cavity is formed between the first limiting groove and a lower end face of the fixed scroll, a ring disc part of the movable scroll is arranged in the limiting cavity, and the limiting cavity limits movement of the ring disc part in the axial direction of the main shaft. 7.The scroll compressor according to claim 6, wherein: the scroll compressor further comprises a limiting sliding ring, a groove bottom face of the first limiting groove is provided with a second limiting groove, and the limiting sliding ring is movably arranged in the second limiting groove in a radial direction of the support rod. ​ ​ ​ ​ ​ ​ ​ ​ ​ The lower end surface of the ring disc part is provided with a first sliding groove which extends in the radial direction of the support rod, and the upper end surface of the limiting sliding ring is provided with an upper key which is movably located in the first sliding groove in the radial direction of the support rod.

8. The scroll compressor according to claim 7, characterized in that: The bottom surface of the second limiting groove is provided with a second sliding groove which extends in the radial direction of the support rod, and the lower end surface of the limiting sliding ring is provided with a lower key which is movably located in the second sliding groove in the radial direction of the support rod, and the lower key and the upper key are arranged in the circumferential direction of the support rod.

9. A heat exchanger comprising a scroll compressor, characterized in that: The scroll compressor is the scroll compressor according to any one of claims 1 to 8.

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