Eccentric mechanism for scroll compressor and scroll compressor

Abstract

The invention provides an eccentric mechanism for a scroll compressor and the scroll compressor, the eccentric mechanism comprises an eccentric adjusting assembly, the eccentric adjusting assembly comprises a balance block and a center adjusting structure which are of a split structure, the balance block is provided with a mounting part and a counterweight part connected with the mounting part, the mounting part sleeves an eccentric shaft and is fixedly mounted with a crankshaft, and the center adjusting structure is arranged on the mounting part; and the aligning structure is sleeved on the eccentric shaft and is rotationally connected with the eccentric shaft. And a circumferential limiting structure is arranged between the mounting part and the aligning structure and is used for limiting the circumferential rotation interval of the aligning structure around the eccentric shaft. The self-aligning structure and the balance block are of a split type structure, so that the weight of the eccentric mechanism is reduced relative to that of an integrated structure, the centrifugal force generated by the eccentric mechanism is also reduced, the meshing stability, especially the low-speed meshing stability and the low-speed loading capacity, of a movable scroll plate and a static scroll plate in the compressor can be guaranteed, and the operation range of the scroll compressor is widened.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and in particular to an eccentric mechanism for a scroll compressor and a scroll compressor. Background Technology

[0002] Currently, scroll compressors are a type of positive displacement compressor. The compression components consist of a moving scroll and a stationary scroll. The working principle is to use the relative revolution of the moving and stationary scrolls to form a continuous change in the closed volume, thereby achieving the purpose of compressing gas.

[0003] Among them, the development trend of automotive scroll compressors is a wide speed range. However, when the compressor is running at a low speed, if the moving scroll and the stationary scroll cannot mesh stably, internal leakage will occur. This will result in lower compressor performance and higher exhaust temperature, thus affecting the operating range of the compressor.

[0004] Therefore, achieving stable meshing between the moving scroll and the stationary scroll is a factor in improving the operating range of the scroll compressor.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] In view of the problems in the prior art, the purpose of the present invention is to provide an eccentric mechanism for a scroll compressor and a scroll compressor, which overcomes the difficulties of the prior art and can solve the problem of reduced compressor operating range.

[0007] The first aspect of this disclosure provides an eccentric mechanism for a scroll compressor, comprising:

[0008] A crankshaft, including a main shaft and an eccentric shaft connected to one end of the main shaft;

[0009] An eccentric adjustment assembly includes a balance block and a self-aligning structure. The balance block and the self-aligning structure are separate structures. The balance block has a mounting part and a counterweight part connected to the mounting part. The mounting part is sleeved on the eccentric shaft and fixedly installed with the crankshaft. The self-aligning structure is sleeved on the eccentric shaft and rotatably connected to the eccentric shaft.

[0010] Along the axial direction of the eccentric shaft, the mounting part is located between the main shaft and the self-aligning structure, and a circumferential limiting structure is provided between the mounting part and the self-aligning structure. The circumferential limiting structure is used to limit the circumferential rotation range of the self-aligning structure around the eccentric shaft.

[0011] In an optional embodiment, the self-aligning structure and the eccentric shaft are in a clearance fit.

[0012] In an optional embodiment, in the first end face and the second end face of the mounting part and the self-aligning structure arranged opposite each other along the axial direction of the eccentric shaft, the first end face is provided with a stop block along the axial direction of the eccentric shaft, and the second end face is provided with a stop groove that cooperates with the stop block. The stop groove defines the circumferential rotation range along the two side walls of the eccentric shaft in the circumferential direction, and the stop block is located in the stop groove.

[0013] In an optional embodiment, the first end face is disposed on the mounting portion, and the second end face is disposed on the self-aligning structure.

[0014] In an optional embodiment, a return oil hole is provided on the second end face, which extends through the self-aligning structure along the axial direction.

[0015] In an optional embodiment, an axial protrusion is provided on the radial outer edge of the first end face, the axial protrusion being used to abut against the inner ring of the bearing along the axial direction.

[0016] In an alternative embodiment, the axial protrusion is arc-shaped, extending circumferentially along the eccentric axis, and the arc-shaped axial protrusion faces the self-aligning structure radially along the eccentric axis.

[0017] In an optional embodiment, the mounting part has a through hole, and the mounting part is mounted to the spindle via a connector, the connector passing through the through hole and being fixedly mounted to the spindle.

[0018] In an optional embodiment, a clearance groove is provided on the outer peripheral surface of the self-aligning structure. The clearance groove is cut off at a second end face along the axial direction of the self-aligning structure. The second end face is the end of the self-aligning structure that is close to the mounting part along its axial direction. The clearance groove is used to provide installation space when the connector is installed.

[0019] A second aspect of this disclosure provides a scroll compressor including an eccentric mechanism for a scroll compressor as described in any of the above embodiments.

[0020] In the eccentric mechanism of this embodiment, the balance block is used to drive the centrifugal rotation of the moving scroll. By making the self-aligning structure and the balance block separate, the weight of the eccentric mechanism is reduced compared to the integrated structure, and the centrifugal force generated is also reduced. This helps to ensure the meshing stability of the moving and stationary scrolls in the compressor, especially the low-speed meshing stability and low-speed load-bearing capacity. At the same time, the centrifugal force of the counterweight does not participate in the meshing of the moving and stationary scrolls, but still ensures the axial imbalance of the compressor. This design ensures the meshing effect of the compressor after operation and makes the compressor run smoothly. In particular, it ensures the sealing effect of the working chamber when the compressor is running at low speed, avoids repeated compression, and ensures the compression effect and operating range of the compressor. In addition, the balance block and self-aligning structure in the separate eccentric mechanism are manufactured separately. The separate balance block and self-aligning structure have a simpler structure and lower manufacturing cost compared to the integrated structure.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0022] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0023] Figure 1 An exploded view of an eccentric mechanism for a scroll compressor according to an embodiment of the present disclosure is shown.

[0024] Figure 2 A cross-sectional view of an eccentric mechanism for a scroll compressor according to an embodiment of the present disclosure is shown.

[0025] Figure 3 yes Figure 1 A three-dimensional view of the balance block in the eccentric mechanism shown.

[0026] Figure 4 yes Figure 1 A three-dimensional view of the centering structure in the eccentric mechanism shown.

[0027] Figure 5 yes Figure 1 The eccentric mechanism shown is an axial view of the compressor in normal engagement.

[0028] Figure 6 yes Figure 1 The eccentric mechanism shown is an axial view of the compressor in the retracted and disengaged state.

[0029] Figure 7 This is an exploded view of the scroll compressor provided in the embodiments of this disclosure.

[0030] Figure 8This is a cross-sectional view of the scroll compressor provided in an embodiment of this disclosure. Detailed Implementation

[0031] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0032] Furthermore, the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to define the order of functions performed by these devices, modules or units or their interdependencies.

[0033] In related technologies, the moving scroll plate is driven by an eccentric mechanism to achieve engagement and disengagement with the stationary scroll plate. This eccentric mechanism includes a balance block and a self-aligning structure, both integrally molded, resulting in a more compact compressor structure. However, research has revealed two problems with this eccentric mechanism: firstly, the centrifugal force generated by the eccentric mechanism partially counteracts the centrifugal force of the moving scroll plate, degrading the compressor's low-speed engagement capability and further affecting its operating range. Secondly, existing eccentric mechanisms are relatively complex and costly to manufacture.

[0034] Figure 1 An exploded view of the eccentric mechanism for a scroll compressor provided in an embodiment of this disclosure is shown. Figure 2 A cross-sectional view of an eccentric mechanism for a scroll compressor provided in an embodiment of this disclosure is shown, such as... Figure 1 and Figure 2 As shown, the eccentric mechanism may include:

[0035] Crankshaft 1 includes a main shaft 11 and an eccentric shaft 12 connected to one end of the main shaft 11;

[0036] The eccentric adjustment assembly 2 includes a balance block 21 and a self-aligning structure 22. The balance block 21 and the self-aligning structure 22 are separate structures. The balance block 21 has a mounting part 211 and a counterweight part 212 connected to the mounting part 211. The mounting part 211 is sleeved on the eccentric shaft 12 and fixedly installed with the crankshaft 1. The self-aligning structure 22 is sleeved on the eccentric shaft 12 and rotatably connected to the eccentric shaft 12.

[0037] Along the axial direction of the eccentric shaft 12, the mounting part 211 is located between the main shaft 11 and the self-aligning structure 22. A circumferential limiting structure 3 is provided between the mounting part 211 and the self-aligning structure 22. The circumferential limiting structure 3 is used to limit the circumferential rotation range of the self-aligning structure 22 around the eccentric shaft 12.

[0038] The circumferential rotation range corresponds to two states of the self-aligning structure 22 in the compressor: normal operation and retraction. In the normal operation state, the moving scroll and stationary scroll in the compressor are engaged; in the retraction state, they are disengaged. Thus, this circumferential rotation range is used to define the limit positions of the circumferential rotation of the self-aligning structure 22 when switching between the engagement and disengagement states of the scroll and stationary scroll.

[0039] In the eccentric mechanism 2 of this embodiment, the balance block 21 is used to drive the centrifugal rotation of the moving scroll. By making the self-aligning structure 22 and the balance block 21 separate, the weight of the eccentric mechanism 2 is reduced compared to the integral structure, and the centrifugal force generated is also reduced. This helps to ensure the stable meshing of the moving scroll and the stationary scroll in the compressor. At the same time, the centrifugal force of the counterweight 212 does not participate in the meshing of the moving scroll and the stationary scroll, but still ensures the axial imbalance of the compressor. This design ensures the meshing effect of the compressor after operation and makes the compressor run smoothly. In particular, it ensures the sealing effect of the working chamber when the compressor is running at low speed, avoids repeated compression, and ensures the compression effect and operating range of the compressor. At the same time, the balance block 21 and the self-aligning structure 22 in the separate eccentric mechanism 2 are manufactured separately. The separate balance block 21 and the self-aligning structure 22 have a simpler structure and lower manufacturing cost compared to the integral structure.

[0040] In this disclosure, such as Figure 1 and 2 As shown, the mounting part 211 has a through hole 2a. The mounting part 211 is mounted to the main shaft 11 via a connector 4. The connector 4 passes through the through hole 2a and is fixedly mounted to the main shaft 11. In this embodiment, the mounting part 211 is fixedly mounted to the main shaft 11 via an additional connector 4, thereby achieving a fixed mounting of the balance block 21 to the crankshaft.

[0041] In this embodiment, a mounting groove 11a is provided on the end face of the spindle 11 facing the mounting part 211 along its axial direction, in cooperation with the connector 4. The connector 4 passes through the through hole 2a and is inserted into the mounting groove 11a to be fixedly installed with the mounting groove 11a.

[0042] In one embodiment, the connector 4 can be a retaining pin, rivet, or bolt, etc., and is not limited thereto. For example, the connector 4 is a retaining pin, which is pressed into the mounting groove 11a to achieve fixation.

[0043] In another embodiment, the balance block can also be fixedly installed on the crankshaft by forming an interference fit with the eccentric shaft through the mounting part.

[0044] In this embodiment of the disclosure, the self-aligning structure 22 and the eccentric shaft 12 are in clearance fit. The clearance fit is used to realize the rotation of the self-aligning structure 22 around the eccentric shaft 12, thereby realizing the rotational connection between the self-aligning structure 22 and the eccentric shaft 12.

[0045] In this embodiment of the disclosure, the circumferential limiting mechanism 3 includes:

[0046] like Figure 3 The stop block 31 shown is disposed on the mounting portion 211 along the eccentric axis 12 (e.g., Figure 2 The axial self-aligning structure 22 (as shown) Figure 2 The first end face 2111 (as shown);

[0047] like Figure 4 The stop groove 3a shown is provided on the second end face 221 of the self-aligning structure 22 facing the mounting part 211 along the axial direction of the eccentric shaft 12. The stop groove 3a defines the circumferential rotation range 3b along the two side walls of the eccentric shaft 12. The stop block 31 ( Figure 3 It mates with the stop groove 3a and is placed inside the stop groove 3a.

[0048] The working principle of the circumferential limiting structure 3 is explained as follows:

[0049] like Figure 5 As shown, in the normal operating state of the compressor, the stop block 31 is close to the first side wall 321 of the stop groove 3a, which corresponds to the meshing state of the moving scroll and the stationary scroll.

[0050] like Figure 6 As shown, in the compressor retraction state, the stop block 31 abuts against the second side wall 322 of the stop groove 3a in the circumferential direction, which corresponds to the separation state of the moving scroll and the stationary scroll.

[0051] Combination Figure 5 and Figure 6 During the process of switching from the normal operating state of the compressor to the retraction state, the self-aligning structure 22 rotates counterclockwise in the direction S as shown in the figure until the second side wall 322 abuts against the stop block 31. At this time, the counterclockwise rotation of the self-aligning structure 22 is stopped. Therefore, the abutment position of the second side wall 322 and the stop block 31 corresponds to the limit position of the self-aligning structure 22 in the retraction state, realizing precise state switching.

[0052] In the above embodiment, during normal compressor operation, since the moving scroll and stationary scroll are engaged and mutually restrained, the stop block 31 and the first sidewall 321 do not need to contact each other. This avoids restricting the engagement position between the moving scroll and stationary scroll, improving the compressor's operational stability and reliability. Of course, non-contact is one example; in another embodiment, the stop block and the first sidewall can also contact each other without affecting the aforementioned engagement position.

[0053] like Figure 5 As shown, the stop block 31 protrudes axially along the eccentric shaft 12 relative to the first end face 2111 and is in the form of a radially extending convex strip. In other embodiments, its structure is not limited to this, and its shape can be adjusted according to the actual installation environment. Figure 6 As shown, the stop groove 3a is cut off radially along the inner and outer circumferential surfaces of the self-aligning structure 22. Its structure is not limited to this and its specific shape can be adjusted according to the actual installation environment.

[0054] In another embodiment of this disclosure, a stop groove may be formed on the first end face of the mounting portion, and a stop block may be formed on the lower second end face of the self-aligning structure. The stop block and the stop groove cooperate with each other to form a circumferential limiting structure.

[0055] Therefore, the circumferential limiting structure of the two embodiments described above can be summarized as follows: in the first end face and the second end face of the mounting part and the self-aligning structure arranged opposite each other along the axial direction of the eccentric shaft, the first end face is provided with a stop block along the axial direction of the eccentric shaft, and the second end face is provided with a stop groove that cooperates with the stop block. The stop groove defines the circumferential rotation range along the two side walls of the eccentric shaft, and the stop block is located in the stop groove.

[0056] In this disclosure, such as Figure 4 As shown, an oil return hole 22a is provided on the second end face 221, which extends axially through the self-aligning structure 22. The oil return hole 22a is used to return the liquid in the compressor to the compressor housing and enter the compression chamber.

[0057] In this disclosure, such as Figure 1 and 2 As shown, connector 4 is a fixing pin, used to securely mount the spindle 11 to the spindle. Figures 4-6 As shown, a clearance groove 2b is provided on the outer peripheral surface 222 of the self-aligning structure 22. The clearance groove 2b is cut off at the second end face 221 along the axial direction of the self-aligning structure 22. The second end face 221 is the end of the self-aligning structure 22 that is close to the mounting part 211 along its axial direction. The clearance groove 2b is used to provide installation space when the connector 4 is installed.

[0058] During the installation of the retaining pin, the retaining pin is operated to pass through the through hole 2a, and then the pin head of the retaining pin is fixed to the spindle 11 using the appropriate tool. At this time, the clearance groove 2b provides operating and installation space, ultimately fixing the retaining pin to the spindle 11. Figure 5 and Figure 6 As shown, the pin head of the fixing pin (connector 4) and the clearance groove 2b partially overlap when viewed along the axial direction of the eccentric shaft 12.

[0059] In one embodiment of this disclosure, such as Figure 3 As shown, an axial protrusion 2112 is provided on the first end face 2111. Combined with... Figure 1 As shown, the axial protrusion 2112 is used to abut against the bearing 7 axially. In this embodiment, the axial protrusion 2112 of the bearing 71 abuts axially against the end face of the bearing 7 to form an axial stop and limit. Specifically, as... Figure 1 The bearing 7 shown is actually the inner ring of the bearing. The outer ring of the bearing is installed with the moving scroll plate, as detailed below.

[0060] In one implementation, such as Figure 3 As shown, the axial protrusion 2112 is oriented around the eccentric shaft 12 (e.g., Figure 1 As shown, an arc extending circumferentially from the central axis. Combined with... Figure 5 As shown, the self-aligning structure 22 is located inside the arc-shaped axial protrusion 2112, which refers to the inner side of the arc-shaped axial protrusion 2112 along its radial direction. In this way, the axial protrusion 2112 can provide radial restraint for the self-aligning structure 22, maintaining the stability and reliability of the self-aligning structure 22 when rotating relative to the eccentric shaft 12.

[0061] exist Figure 3 In this example, the axial protrusion 2112 is divided into two segments. In other configurations, it can also be a single, complete arc. The axial end face of the protrusion 2112 is provided as a stop surface, abutting against the end face of the bearing inner ring, ensuring surface-to-surface contact and preventing scratches on the end face of the bearing inner ring.

[0062] This embodiment also provides a scroll compressor, which includes the eccentric mechanism as described above. Specifically, as... Figure 7 and 8 As shown, the scroll compressor also includes a motor 6 ( Figure 7 Known components such as (not shown), moving scroll disk 5, and stationary scroll disk (not shown in the figure), although... Figure 7 and Figure 8This is merely a partial structural diagram of a scroll compressor in one embodiment of this disclosure, but the structure and connection relationships of known components can all be achieved using existing technologies. To highlight the improvements of this disclosure, the relevant existing technologies will not be described in detail here. The crankshaft 1 is connected to the moving scroll 5 via a self-aligning structure 22. The motor includes a rotor 61 and a stator 62. The rotor 61 is connected to the main shaft 11 to provide driving force to the moving scroll 5.

[0063] In this embodiment, the self-aligning structure 22 is rotatably connected to the eccentric shaft 12 of the crankshaft 1. The self-aligning structure 22 is connected to the moving scroll plate 6 via a bearing 7. The bearing 7 is sleeved on the self-aligning structure 22, with its inner ring 71 fixedly installed and its outer ring 72 fixedly installed. When the motor 6 drives the main shaft 11 to rotate around its central axis, the eccentric shaft 12, being eccentrically positioned relative to the main shaft 11, actually revolves around the central axis of the main shaft 11. This, in turn, drives the moving scroll plate 6 to engage and disengage with the stationary scroll plate via the bearing 7. Therefore, the eccentricity of the moving scroll plate 6 depends on the relative position of the self-aligning structure 22 and the main shaft 11.

[0064] Combination Figure 5 and Figure 6 The stop block 31 and the stop groove 3a together define the circumferential rotation range of the self-aligning structure 22 around the eccentric shaft 12, thereby controlling the eccentricity of the moving scroll plate 6. Figure 6 As shown, in the compressor retracted state, the stop block 31 abuts circumferentially against the second sidewall 322 of the stop groove 3a, and the eccentricity of the moving scroll plate 6 can be determined. Therefore, the embodiments of this disclosure can not only improve the operating range of the scroll compressor, but also ensure the reliability of the scroll compressor through precise control of the eccentricity of the scroll compressor.

[0065] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. An eccentric mechanism for a scroll compressor, characterized in that, include: A crankshaft, including a main shaft and an eccentric shaft connected to one end of the main shaft; An eccentric adjustment assembly includes a balance block and a self-aligning structure. The balance block and the self-aligning structure are separate structures. The balance block has a mounting part and a counterweight part connected to the mounting part. The mounting part is sleeved on the eccentric shaft and fixedly installed with the crankshaft. The self-aligning structure is sleeved on the eccentric shaft and rotatably connected to the eccentric shaft. Along the axial direction of the eccentric shaft, the mounting part is located between the main shaft and the self-aligning structure, and a circumferential limiting structure is provided between the mounting part and the self-aligning structure. The circumferential limiting structure is used to limit the circumferential rotation range of the self-aligning structure around the eccentric shaft.

2. The eccentric mechanism for a scroll compressor according to claim 1, characterized in that, The self-aligning structure and the eccentric shaft are in a clearance fit.

3. The eccentric mechanism for a scroll compressor according to claim 1, characterized in that, In the first end face and the second end face of the mounting part and the self-aligning structure arranged opposite each other along the axial direction of the eccentric shaft, the first end face is provided with a stop block along the axial direction of the eccentric shaft, and the second end face is provided with a stop groove that cooperates with the stop block. The stop groove defines the circumferential rotation range along the two side walls of the eccentric shaft in the circumferential direction, and the stop block is located in the stop groove.

4. The eccentric mechanism for a scroll compressor according to claim 3, characterized in that, The first end face is disposed on the mounting portion, and the second end face is disposed on the self-aligning structure.

5. The eccentric mechanism for a scroll compressor according to claim 4, characterized in that, A return oil hole is provided on the second end face, which extends through the self-aligning structure along the axial direction.

6. The eccentric mechanism for a scroll compressor according to claim 4, characterized in that, An axial protrusion is provided on the first end face, the axial protrusion being used to abut against the bearing sleeved outside the self-aligning structure along the axial direction.

7. The eccentric mechanism for a scroll compressor according to claim 6, characterized in that, The axial protrusion is arc-shaped, extending circumferentially along the central axis of the eccentric shaft, and the self-aligning structure is located inside the arc-shaped axial protrusion.

8. The eccentric mechanism for a scroll compressor according to claim 1, characterized in that, The mounting part has a through hole, and the mounting part is installed on the spindle via a connector. The connector passes through the through hole and is fixedly installed on the spindle.

9. The eccentric mechanism for a scroll compressor according to claim 8, characterized in that, An avoidance groove is provided on the outer peripheral surface of the self-aligning structure. The avoidance groove is cut off at the second end face along the axial direction of the self-aligning structure. The second end face is the end of the self-aligning structure that is close to the mounting part along its axial direction. The avoidance groove is used to provide installation space when the connector is installed.

10. A scroll compressor, characterized in that, Includes the eccentric mechanism for a scroll compressor as described in any one of claims 1-9.

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