Eccentric mechanism for scroll compressor and scroll compressor
Through the split eccentric adjustment assembly and circumferential limiting mechanism, the problem of low-speed meshing instability of scroll compressors is solved, and stable meshing and extended operating range is achieved, reducing manufacturing costs.
Patent Information
- Application Number
- CN202422681186.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-11-05
AI Technical Summary
The existing scroll compressors cannot engage the static scroll with the static scroll at low speeds, resulting in a degradation in performance and high exhaust temperature, affecting the operating range.
The split eccentric adjustment assembly, including a balance block and a center-aligning structure, ensures stable engagement between the movable scroll and the static scroll by reducing the weight and centrifugal force of the eccentric adjustment assembly, especially maintains a sealing effect at low speeds, and accurately controls the engagement and separation state through the circumferential limiting mechanism.
It improves the low-speed meshing stability and operating range of the scroll compressor, reduces manufacturing costs, and ensures the smooth operation and sealing effect of the compressor, avoiding repeated compression.
Smart Images
Figure CN223257071U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of refrigeration equipment, in particular to an eccentric mechanism for a scroll compressor and the scroll compressor. Background Art
[0002] At present, the scroll compressor is a volumetric compression compressor. The compression component consists of a movable scroll and a stationary scroll. Its working principle is to use the relative orbital motion of the movable and stationary scrolls to form a continuous change in the closed volume to achieve the purpose of compressing the gas.
[0003] Among them, the development trend of automotive scroll compressors is towards a wide speed range. However, when the compressor operates at a lower speed, if the orbiting scroll and the stationary scroll cannot engage stably, internal leakage will occur, which will cause the compressor performance to be low and the exhaust temperature to be high, affecting the operating range of the compressor.
[0004] Therefore, achieving stable engagement between the orbiting scroll and the fixed scroll is a factor in improving the operating range of the scroll compressor.
[0005] It should be noted that the information disclosed in the above background technology section 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 ordinary technicians in this field. Utility Model Content
[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 operating range of the compressor.
[0007] A first aspect of the present disclosure provides an eccentric mechanism for a scroll compressor, comprising:
[0008] A crankshaft comprising a main shaft and an eccentric shaft connected to one end of the main shaft;
[0009] The eccentric adjustment assembly includes a balancing block and a centering structure. The balancing block and the centering structure are split structures. The balancing block has a mounting portion and a counterweight portion connected to the mounting portion. The mounting portion is sleeved on the eccentric shaft and fixedly mounted on the crankshaft. The centering structure is sleeved on the eccentric shaft and is rotatably connected to the eccentric shaft.
[0010] Among them, along the axial direction of the eccentric shaft, the mounting portion is located between the main shaft and the centering structure, and a circumferential limiting mechanism is provided between the mounting portion and the centering structure, and the circumferential limiting mechanism is used to limit the circumferential rotation range of the centering structure around the eccentric shaft.
[0011] In an optional embodiment, there is a clearance fit between the centering structure and the eccentric shaft.
[0012] In an optional embodiment, in the first end face and the second end face of the mounting portion and the centering structure that are arranged opposite to 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, and 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 surface is provided on the mounting portion, and the second end surface is provided on the centering structure.
[0014] In an optional embodiment, an oil return hole is provided on the second end surface and passes through the centering structure along the axial direction.
[0015] In an optional embodiment, an axial protrusion is provided on the radial outer edge of the first end surface, and the axial protrusion is used to abut against the bearing inner ring along the axial direction.
[0016] In an optional embodiment, the axial protrusion is in an arc shape extending along the circumference of the eccentric shaft, and along the radial direction of the eccentric shaft, the arc-shaped axial protrusion faces the centering structure.
[0017] In an optional embodiment, the mounting portion has a through hole, the mounting portion and the main shaft are mounted via a connecting piece, and the connecting piece passes through the through hole and is fixedly mounted to the main shaft.
[0018] In an optional embodiment, an avoidance groove is provided on the outer peripheral surface of the centering structure, and the avoidance groove is cut off at a second end surface along the axial direction of the centering structure. The second end surface is an end of the centering structure close to the mounting portion along its axial direction, and the avoidance groove is used to provide an installation space when the connecting member is installed.
[0019] A second aspect of the present disclosure provides a scroll compressor, which includes the eccentric mechanism for a scroll compressor according to any one of the above embodiments.
[0020] In the eccentric mechanism of the embodiment disclosed herein, the balancing block is used to drive the centrifugal rotation of the movable scroll. By making the centering structure and the balancing block a split structure, the weight of the eccentric adjustment assembly is reduced relative to the integrated structure, and the centrifugal force generated by it is also reduced, which is beneficial to ensuring the meshing stability of the movable scroll and the fixed scroll in the compressor, especially the low-speed meshing stability and low-speed load capacity. At the same time, the centrifugal force of the counterweight will not participate in the meshing of the movable scroll and the fixed scroll, but can still ensure the axial imbalance of the compressor. This design not only ensures the meshing effect of the compressor after operation, but also allows the compressor to operate smoothly, especially when the compressor is running at low speed, it can ensure the sealing effect of the working chamber, avoid repeated compression, and ensure the compression effect and operating range of the compressor. At the same time, the balancing block and the centering structure in the split eccentric adjustment assembly are made separately. Compared with the integrated structure, the separate balancing block and the centering structure have a simpler structure and lower manufacturing cost.
[0021] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings.
[0023] Figure 1 An exploded view showing an eccentric mechanism for a scroll compressor according to an embodiment of the present disclosure.
[0024] Figure 2 A cross-sectional view showing an eccentric mechanism for a scroll compressor according to an embodiment of the present disclosure.
[0025] Figure 3 yes Figure 1 A three-dimensional view of the balancing weight in the eccentric mechanism shown.
[0026] Figure 4 yes Figure 1 A three-dimensional diagram of the centering structure in the eccentric mechanism shown.
[0027] Figure 5 yes Figure 1 An axial view of the eccentric mechanism shown in the compressor when it is in normal engagement.
[0028] Figure 6 yes Figure 1 An axial view of the eccentric mechanism shown when the compressor is in a retracted and disengaged state.
[0029] Figure 7 1 is an exploded view of a scroll compressor provided in an embodiment of the present disclosure.
[0030] Figure 8It is a cross-sectional view of the scroll compressor provided in an embodiment of the present disclosure. DETAILED DESCRIPTION
[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example 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] In addition, the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.
[0033] In related technologies, the orbiting scroll is driven by an eccentric mechanism to achieve engagement and disengagement with the stationary scroll. The eccentric mechanism includes a balancing block and a centering structure, both of which are integrally formed, making the compressor more compact. However, research has revealed two problems with this eccentric mechanism. First, the centrifugal force generated by the eccentric mechanism partially offsets the centrifugal force of the orbiting scroll, which deteriorates the compressor's low-speed engagement capability and further affects the compressor's operating range. Furthermore, existing eccentric mechanisms are relatively complex in structure and have high manufacturing costs.
[0034] Figure 1 An exploded view showing an eccentric mechanism for a scroll compressor provided by an embodiment of the present disclosure is shown. Figure 2 A cross-sectional view showing an eccentric mechanism for a scroll compressor provided by an embodiment of the present disclosure is shown. Figure 1 and Figure 2 As shown, the eccentric mechanism may include:
[0035] The 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 balancing weight 21 and a centering structure 22. The balancing weight 21 and the centering structure 22 are split structures. The balancing weight 21 has a mounting portion 211 and a counterweight portion 212 connected to the mounting portion 211. The mounting portion 211 is sleeved on the eccentric shaft 12 and fixedly mounted on the crankshaft 1. The centering structure 22 is sleeved on the eccentric shaft 12 and is rotationally connected to the eccentric shaft 12.
[0037] Among them, along the axial direction of the eccentric shaft 12, the mounting portion 211 is located between the main shaft 11 and the centering structure 22, and a circumferential limiting mechanism 3 is provided between the mounting portion 211 and the centering structure 22, and the circumferential limiting mechanism 3 is used to limit the circumferential rotation range of the centering structure 22 around the eccentric shaft 12.
[0038] The circumferential rotation range corresponds to the two states of the centering structure 22 in the compressor: normal operation and retraction. In the normal operation state, the orbiting scroll and the fixed scroll are engaged. In the retraction state, the orbiting scroll and the fixed scroll are separated. Thus, this circumferential rotation range is used to define the extreme positions of the circumferential rotation of the centering structure 22 when switching between the engagement and separation states of the scroll and the fixed scroll.
[0039] In the eccentric adjustment assembly 2 of the embodiment of the present disclosure, the balancing block 21 is used to drive the centrifugal rotation of the movable scroll. By making the centering structure 22 and the balancing block 21 a split structure, the weight of the eccentric adjustment assembly 2 is reduced relative to the integrated structure, and the centrifugal force generated by it is also reduced, which is conducive to ensuring the stable engagement of the movable scroll and the fixed scroll in the compressor. At the same time, the centrifugal force of the counterweight portion 212 will not participate in the engagement of the movable scroll and the fixed scroll, but can still ensure the axial imbalance of the compressor. This design not only ensures the engagement effect of the compressor after operation, but also allows the compressor to operate smoothly, especially when the compressor is running at low speed, it can ensure the sealing effect of the working chamber, avoid repeated compression, and ensure the compression effect and operating range of the compressor. At the same time, the balancing block 21 and the centering structure 22 in the split eccentric adjustment assembly 2 are made separately. Compared with the integrated structure, the separate balancing block 21 and the centering structure 22 have a simpler structure and lower manufacturing cost.
[0040] In the embodiments of the present disclosure, Figure 1 and 2 As shown, the mounting portion 211 has a through hole 2a, and the mounting portion 211 is mounted on the main shaft 11 via a connector 4. The connector 4 passes through the through hole 2a and is fixedly mounted on the main shaft 11. In this embodiment, the mounting portion 211 is fixedly mounted on the main shaft 11 through an additional connector 4, thereby achieving fixed mounting of the balancing weight 21 on the crankshaft.
[0041] In this embodiment, in conjunction with the connecting member 4, a mounting groove 11a is provided on the end face of the main shaft 11 facing the mounting portion 211 along its axial direction. The connecting member 4 is inserted into the mounting groove 11a after passing through the through hole 2a and is fixedly installed with the mounting groove 1a.
[0042] In one embodiment, the connecting member 4 can be a fixing pin, a rivet, or a bolt, etc., which is not limited here. For example, the connecting member 4 is a fixing pin, which is pressed into the installation groove 11a to achieve fixation.
[0043] In another embodiment, the balancing weight may also form an interference fit with the eccentric shaft through the mounting portion, thereby achieving fixed mounting of the balancing weight as a whole on the crankshaft.
[0044] In the embodiment of the present disclosure, there is a clearance fit between the centering structure 22 and the eccentric shaft 12 , and the clearance fit is used to enable the centering structure 22 to rotate around the eccentric shaft 12 , thereby achieving a rotational connection between the centering structure 22 and the eccentric shaft 12 .
[0045] In the embodiment of the present disclosure, the circumferential limiting mechanism 3 includes:
[0046] like Figure 3 The stop block 31 is provided on the mounting portion 211 along the eccentric shaft 12 (as shown in FIG. Figure 2 The axially oriented centering structure 22 (as shown) Figure 2 a first end surface 2111 shown);
[0047] like Figure 4 The stop groove 3a is provided on the second end surface 221 of the centering structure 22 facing the mounting portion 211 along the axial direction of the eccentric shaft 12. The stop groove 3a defines a circumferential rotation range 3b along the two side walls of the eccentric shaft 12. The stop block 31 ( Figure 3 ) cooperates with the stop groove 3a and is placed in the stop groove 3a.
[0048] The working principle of the circumferential limiting mechanism 3 is described as follows:
[0049] like Figure 5 As shown, in the normal working 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 orbiting scroll and the fixed scroll;
[0050] like Figure 6 As shown, in the retraction state of the compressor, the stop block 31 abuts against the second side wall 322 of the stop groove 3a along the circumferential direction, which corresponds to the separation state of the orbiting scroll and the fixed scroll.
[0051] Combine Figure 5 and Figure 6 In the process of switching from the normal working state of the compressor to the retraction state, the centering structure 22 rotates in the counterclockwise 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 centering structure 22 is stopped. Therefore, the abutting position of the second side wall 322 and the stop block 31 corresponds to the extreme position of the centering structure 22 in the retraction state, realizing precise state switching.
[0052] In the above embodiment, during normal operation of the compressor, since the orbiting scroll and the fixed scroll are engaged and mutually restricted, the stopper 31 and the first side wall 321 may not contact each other. This avoids restricting the engagement position between the orbiting scroll and the fixed scroll, thereby improving the operating stability and reliability of the compressor. Of course, the non-contact is merely an example; in other embodiments, the stopper and the first side wall may contact each other without affecting the engagement position.
[0053] like Figure 5 As shown, the stop block 31 protrudes along the axial direction of the eccentric shaft 12 relative to the first end surface 2111 and is in the shape of a convex strip extending in the radial direction. 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 at the inner circumference and the outer circumference of the centering structure 22 along the radial direction of the centering structure 22. The structure is not limited thereto, and its specific shape can be adjusted according to the actual installation environment.
[0054] In another embodiment of the present 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 centering structure, and the stop block and the stop groove may cooperate with each other to form a circumferential limiting mechanism.
[0055] Therefore, the circumferential limiting mechanism of the above two embodiments can be summarized as follows: in the first end face and the second end face of the mounting portion and the centering structure which are arranged opposite to 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 which cooperates with the stop block, and the stop groove limits the circumferential rotation range along the side walls on both sides of the circumference of the eccentric shaft, and the stop block is located in the stop groove.
[0056] In the embodiments of the present disclosure, Figure 4 As shown, an oil return hole 22a is provided on the second end surface 221 and axially penetrates the centering 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 the embodiments of the present disclosure, Figure 1 and 2 As shown, the connecting member 4 is a fixing pin. In order to cooperate with the fixing pin and the main shaft 11 for fixed installation, as shown in FIG. Figure 4-Figure 6 As shown, an avoidance groove 2b is provided on the outer peripheral surface 222 of the centering structure 22, and the avoidance groove 2b is cut off at the second end face 221 along the axial direction of the centering structure 22. The second end face 221 is one end of the centering structure 22 along its axial direction close to the mounting portion 211. The avoidance groove 2b is used to provide an installation space when the connecting member 4 is installed.
[0058] When installing the fixing pin, operate the fixing pin to pass through the through hole 2a, and then use the corresponding tool to operate the pin head of the fixing pin to fix it to the main shaft 11. At this time, the avoidance groove 2b provides an operating installation space, and finally the fixing pin is fixed to the main shaft 11. Figure 5 and Figure 6 As shown, the pin head of the fixing pin (connecting member 4) and the avoidance groove 2b partially overlap when viewed along the axial direction of the eccentric shaft 12.
[0059] In one embodiment of the present disclosure, Figure 3 As shown, an axial protrusion 2112 is provided on the first end surface 2111. Figure 1 As shown, the axial protrusion 2112 is used to abut against the bearing 7 in the axial direction. In this embodiment, the axial protrusion 2112 abuts against the end face of the bearing 7 in the axial direction to form an axial stop limit. Specifically, as shown in FIG. Figure 1 The bearing 7 shown is actually the inner ring of the bearing, and the outer ring of the bearing is correspondingly installed with the orbiting scroll, as detailed below.
[0060] In one embodiment, Figure 3 As shown, the axial protrusion 2112 is arranged around the eccentric shaft 12 (as shown in FIG. Figure 1 As shown) the arc extending circumferentially from the central axis. Figure 5 As shown, the centering structure 22 is located on the inner side of the arc-shaped axial protrusion 2112, which refers to the radial inner side of the arc-shaped axial protrusion 2112. In this way, the axial protrusion 2112 can form a radial limit for the centering structure 22, maintaining the stability and reliability of the centering structure 22 when rotating relative to the eccentric shaft 12.
[0061] exist Figure 3 In the example, the axial protrusion 2112 is divided into two sections. In other embodiments, it can also be a complete arc. The axial end surface of the axial protrusion 2112 is configured as a stop surface, abutting the end surface of the bearing inner ring. The surface-to-surface contact prevents scratches on the end surface of the bearing inner ring.
[0062] In this embodiment, a scroll compressor is also provided, which includes the eccentric mechanism of the above embodiment. Figure 7 and 8 As shown, the scroll compressor also includes a motor 6 ( Figure 7 Not shown), movable scroll 5, fixed scroll (not shown) and other known components, although Figure 7 and Figure 8This is only a partial schematic diagram of the scroll compressor structure in one embodiment of the present disclosure. However, the structures and connections of known components can be adapted from existing technologies. To highlight the improvements of the present disclosure, the relevant existing technologies will not be described in detail here. The crankshaft 1 is connected to the orbiting scroll 5 via an 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 orbiting scroll 5.
[0063] In the disclosed embodiment, the centering structure 22 is rotatably connected to the eccentric shaft 12 of the crankshaft 1. The centering structure 22 and the orbiting scroll 5 are connected via a bearing 7. The bearing 7 is mounted on the centering structure 22, with the inner race 71 of the bearing fixedly mounted to the centering structure 22, and the outer race 72 of the bearing fixedly mounted to the orbiting scroll 5. When the motor 6 drives the main shaft 11 to rotate about its central axis, the eccentric shaft 12 is eccentrically positioned relative to the main shaft 11, so that the eccentric shaft 12 actually orbits around the central axis of the main shaft 11, and drives the orbiting scroll 5 to engage and disengage with the fixed scroll through the bearing 7. Therefore, the eccentricity of the orbiting scroll 5 depends on the relative position of the centering structure 22 and the main shaft 11.
[0064] Combine Figure 5 and Figure 6 The stop block 31 and the stop groove 3a together define the circumferential rotation range of the centering structure 22 around the eccentric shaft 12 to control the eccentricity of the orbiting scroll 5. Figure 6 As shown, when the compressor is in the retracted state, the stop block 31 abuts against the second side wall 322 of the stop groove 3a along the circumferential direction, and the eccentricity of the orbiting scroll 5 is determined. Therefore, the embodiment of the present disclosure can not only improve the operating range of the scroll compressor, but also ensure the reliability of the scroll compressor by accurately controlling the eccentricity of the scroll compressor.
[0065] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.
Claims
1. An eccentric mechanism for a scroll compressor, characterized in that: include: A crankshaft comprising a main shaft and an eccentric shaft connected to one end of the main shaft; The eccentric adjustment assembly includes a balancing block and a centering structure. The balancing block and the centering structure are split structures. The balancing block has a mounting portion and a counterweight portion connected to the mounting portion. The mounting portion is sleeved on the eccentric shaft and fixedly mounted on the crankshaft. The centering structure is sleeved on the eccentric shaft and is rotatably connected to the eccentric shaft. Among them, along the axial direction of the eccentric shaft, the mounting portion is located between the main shaft and the centering structure, and a circumferential limiting mechanism is provided between the mounting portion and the centering structure, and the circumferential limiting mechanism is used to limit the circumferential rotation range of the centering structure around the eccentric shaft.
2. The eccentric mechanism for a scroll compressor according to claim 1, characterized in that: The centering structure and the eccentric shaft are clearance-fitted.
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 portion and the centering structure which are arranged opposite to 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 which cooperates with the stop block, and 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 surface is arranged on the mounting portion, and the second end surface is arranged on the centering structure.
5. The eccentric mechanism for a scroll compressor according to claim 4, characterized in that: An oil return hole is provided on the second end surface and passes through the centering 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 surface, and the axial protrusion is used to abut against a 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 in the shape of an arc extending circumferentially along the central axis of the eccentric shaft, and the centering structure is located on the inner side of the arc-shaped axial protrusion.
8. The eccentric mechanism for a scroll compressor according to claim 1, characterized in that: The mounting portion has a through hole, and the mounting portion and the main shaft are mounted via a connecting piece, and the connecting piece passes through the through hole and is fixedly mounted to the main shaft.
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 centering structure, and the avoidance groove is cut off at the second end surface along the axial direction of the centering structure. The second end surface is one end of the centering structure close to the mounting portion along its axial direction. The avoidance groove is used to provide an installation space when the connecting piece is installed.
10. A scroll compressor, characterized in that: The invention comprises an eccentric mechanism for a scroll compressor according to any one of claims 1 to 9.