CN220487867U - Scroll compressor's balancing piece and scroll compressor - Google Patents

Abstract

The present disclosure relates to a counterweight of a scroll compressor and a scroll compressor, the counterweight including a fixed ring and a counterweight, wherein the counterweight is configured to be connected to the fixed ring; and the fixed ring and the balancing weight are meshed through a first serrated surface and a second serrated surface which are matched, the first serrated surface is positioned on the fixed ring, and the second serrated surface is positioned on the balancing weight. The fixed ring and the balancing weight of the split type balancing weight are meshed through the first serrated surface and the second serrated surface which are matched, the contact area between the fixed ring and the balancing weight is increased, the connection strength between the fixed ring and the balancing weight is enhanced, the integrity of the split type balancing weight can be guaranteed even if the balancing weight receives larger centrifugal force, and therefore the working reliability of the scroll compressor is guaranteed. That is, the fixed ring and the balancing weight of the present disclosure adopt a serrated matching structure, the area of the same space for internal matching is increased by multiple times, the stress level is effectively reduced, and the capability of resisting centrifugal force is improved.

Description

Scroll compressor's balancing piece and scroll compressor

Technical Field

The disclosure relates to the technical field of compressors, and in particular relates to a balance weight of a scroll compressor and the scroll compressor.

Background

The scroll compressor is a typical structure of a compressor, is mainly used for air conditioning, refrigeration, general gas compression, automobile engine superchargers, vacuum pumps and other occasions, and can replace the traditional middle-and small-sized reciprocating compressors in a large range.

Scroll compressors typically include a compression mechanism consisting of a fixed scroll member and an orbiting scroll member. The orbiting scroll member is supported by a main bearing housing/thrust plate to provide axial restraint and translational rotation relative to the non-orbiting scroll member under the drive of an eccentric member, such as an eccentric shaft. During operation of the scroll compressor, centrifugal forces or moments generated by the rotation of the eccentric member may cause vibration of the compressor. Weights are typically provided on the rotating assembly, such as the rotor, to provide counter-centrifugal force or torque to balance the amount of dynamic unbalance created by the eccentric.

At present, a split type balance block is generally adopted, and compared with an integral balance block, the split type balance block has smaller limit on the character structure and higher balance weight efficiency. However, the centrifugal force generated when the drive shaft rotates at a high speed is large, and the two split joint blocks of the split type balance weight are separated due to insufficient connection strength.

Disclosure of Invention

The disclosure provides a balance weight of a scroll compressor and the scroll compressor for solving the technical problems existing in the prior art.

In one aspect, the present disclosure provides a weight for a scroll compressor, the weight comprising:

a fixing ring configured to be fixedly fitted over a driving shaft of the scroll compressor;

a counterweight configured to be coupled to the stationary ring; and the fixed ring is meshed with the balancing weight through a first serrated surface and a second serrated surface which are matched, the first serrated surface is positioned on the fixed ring, and the second serrated surface is positioned on the balancing weight.

In one embodiment, the fixing ring has a circular ring-shaped center portion having a center hole for connection with the drive shaft, and two flanks extending in opposite directions from a part of an outer peripheral portion of the center portion, and the first serrated surface is provided on the two flanks.

In one embodiment, the upper edge of the first serrated surface is less than 180 ° relative to the central angle a of the central hole.

In one embodiment, the central angle a of the upper edge of the first serrated surface relative to the central hole is less than 170 ° and greater than 160 °.

In one embodiment, upon assembly, the weight is configured to move radially relative to a second serrated surface to a preset position along a central bore of the retaining ring under an external force until the first serrated surface engages the second serrated surface;

the counterweight further includes a guide structure configured to move the counterweight relative to the counterweight along a predetermined path during assembly, maintain a predetermined distance between the first and second serrated surfaces, and engage the first and second serrated surfaces after the counterweight is moved to a predetermined position.

In one embodiment, the balance weight comprises three guide structures, and the three guide structures are distributed in a triangular shape.

In one embodiment, the guiding structure comprises a guiding groove, a guiding column and a positioning hole arranged in the guiding groove, one of the guiding groove and the guiding column is arranged on the fixed ring, the other guiding groove is arranged on the balancing weight, and the guiding groove extends along the direction of the preset path;

when the fixing ring and the balancing weight are assembled, the guide post moves along the guide groove, and a preset distance is kept between the first serrated surface and the second serrated surface until the first serrated surface and the second serrated surface are meshed when the guide post is inserted into the positioning hole.

In one embodiment, the guide groove is inclined from the first end portion toward the second end portion toward the first serrated surface toward the second serrated surface, wherein the second end portion is provided with the positioning hole.

In one embodiment, the balancing weight is in a C-shaped structure, and after the balancing weight is assembled, the central angle of the balancing weight is approximately coaxial with the central hole of the fixing ring.

In another aspect, the present disclosure provides a scroll compressor comprising:

a frame configured to be connected to a fixed scroll of the scroll compressor and to support a movable scroll of the scroll compressor, the frame having a receiving chamber and a thrust surface through hole communicating with the receiving chamber, the thrust surface through hole being opened on a thrust surface of the frame supporting the movable scroll;

the driving shaft penetrates through the frame and the thrust surface through hole to drive the movable vortex plate to move in a translational mode relative to the fixed vortex plate;

a counterweight arranged on the drive shaft and configured to provide a counter-centrifugal force or force moment to balance the amount of dynamic unbalance created by the eccentric shaft section of the drive shaft, in particular a counterweight as defined in any one of the preceding claims.

One of the beneficial effects of the scroll compressor balancing weight of the present disclosure is: compared with the planar matching of two splicing pieces of the split type balancing weight in the prior art, the split type balancing weight is used in the scroll compressor, the fixing ring of the split type balancing weight is meshed with the balancing weight through the first serrated surface and the second serrated surface which are matched, the contact area between the fixing ring and the balancing weight is increased, the connection strength between the fixing ring and the balancing weight is enhanced, the integrity of the split type balancing weight can be guaranteed even if the balancing weight receives larger centrifugal force, and therefore the working reliability of the scroll compressor is guaranteed. That is, the fixed ring and the balancing weight of the present disclosure adopt a serrated matching structure, the area of the same space for internal matching is increased by multiple times, the stress level is effectively reduced, and the capability of resisting centrifugal force is improved.

In addition, to reduce resistance to movement of the balancing weight relative to the fixed ring, the balancing weight of the present disclosure further includes a guide structure configured to move the balancing weight relative to the balancing weight along a predetermined path when assembled, maintain a predetermined distance between the first and second serrated surfaces, and engage the first and second serrated surfaces after the balancing weight is moved to a predetermined position.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a schematic perspective view of a counterweight of the present disclosure in one embodiment;

FIG. 2 is a schematic top view of the weight shown in FIG. 1;

FIG. 3 is a schematic view of the cross-sectional K-K structure of the weight of FIG. 2;

FIG. 4 is a schematic L-L cross-sectional view of the weight shown in FIG. 2;

FIG. 5 is a schematic structural view of a balancing weight of the split-type balancing weight shown in FIG. 1;

FIG. 6 is a schematic view of a cross-sectional J-J configuration of the counterweight of FIG. 5;

FIG. 7 is a schematic view of the retaining ring of the split weight of FIG. 1;

FIG. 8 is a schematic view of the R-R cross-sectional structure of the retaining ring of FIG. 7;

FIG. 9 is a schematic diagram of the local stress distribution of a retaining ring of a prior art weight;

FIG. 10 is a graph showing the deformation of a conventional weight in the diameter direction;

FIG. 11 is a schematic illustration of stress distribution on a first serrated face of a retaining ring of a counterweight of the disclosure in one embodiment;

fig. 12 is a graph showing the amount of deformation of the weight of the present disclosure in the diameter direction in one embodiment.

The one-to-one correspondence between the component names and the reference numerals in fig. 1 to 8 is as follows:

1 fixing ring: 10 center part, 100 center hole, 101 positioning column, 11 flank, 110 first serrated surface, 12 first mounting hole;

2 balancing weight: 200 second serrated surfaces, 201 second mounting holes, 202 guide grooves and 203 positioning holes.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

For ease of understanding, the specific structure of the scroll compressor of the present disclosure and its principles of operation will be described in detail below in connection with one specific embodiment with reference to fig. 1 through fig.

The terms "axial direction, radial direction, and circumferential direction" are used herein to describe the specific structure of the scroll compressor, and are set with reference to the drive shaft, and are referred to as axial direction along the axial direction of the drive shaft, radial direction along the radial direction of the drive shaft, and circumferential direction along the circumferential direction of the drive shaft.

In this embodiment, the scroll compressor includes a body, a fixed scroll, and an orbiting scroll.

The machine body is usually a thin-wall shell structure, and the space inside the machine body is enough to accommodate the fixed scroll 2, the movable scroll and a driving mechanism for driving the movable scroll to rotate around the fixed scroll.

The fixed vortex disk and the movable vortex disk are provided with vortex-shaped blades, and are mutually meshed in 180-degree staggered opposite mode. The movable vortex disk is driven by a driving crankshaft with small eccentric distance and restrained by an anti-rotation mechanism, and moves around the fixed vortex disk in a plane with small radius, so that a series of crescent cylinder working volumes are formed by the movable vortex disk and the end plate.

It should be noted that, the specific structures of the machine body, the fixed scroll, the movable scroll, and the three and the mutual assembly relationship thereof may be adopted by those skilled in the art, and are not described herein again.

The scroll compressor also includes a drive shaft, a frame, and a counterweight.

Wherein the frame is configured to be connected with the fixed scroll and used for supporting the movable scroll, and the frame is provided with a containing cavity and a thrust surface through hole communicated with the containing cavity, and the thrust surface through hole is arranged on a thrust surface of the frame 5 for supporting the movable scroll.

In detail, the frame includes a main body portion and four connection arms. The main body part is constructed to support the movable vortex plate and is provided with a containing cavity, four connecting arms are sequentially arranged on the outer peripheral wall of the main body part at intervals along the axial circumferential direction, each connecting arm is formed by extending the main body part outwards along the radial direction, the connecting arms and the fixed vortex plate are fixedly connected in a welding mode, an adhesive mode, a riveting mode and the like, and can be detachably connected through fasteners such as screws and bolts. The top surface of the main body part is a thrust surface, and the thrust surface is contacted with the movable vortex disk so as to support the movable vortex disk and bear the movable vortex disk to make the movable vortex disk move in translation relative to the fixed vortex disk.

It is understood that the number of the connecting arms is not limited to the number of the present embodiment, and may be two or an integer number greater than two, and those skilled in the art may select a suitable number based on the actual structure.

The drive shaft comprises a main shaft section and an eccentric shaft section which are connected with each other. The main shaft section is coaxially connected with a rotor of the driving motor, the main shaft section penetrates through the frame, and an eccentric shaft section of the driving shaft penetrates through a thrust surface through hole of the frame to be connected with the movable vortex disc, so that the eccentric shaft section drives the movable vortex disc to move in a translational mode relative to the fixed vortex disc.

The balance weight is provided with the main shaft section of the driving shaft by means of key connection, welding, adhesion and the like so as to synchronously rotate along with the driving shaft, and is configured to provide reverse centrifugal force or centrifugal moment to balance the dynamic unbalance amount generated by the eccentric shaft section of the driving shaft.

Referring to fig. 1, in this embodiment, the counterweight includes a fixed ring 1 and a counterweight 2. For better understanding, please refer to fig. 2 to 8 together.

The fixing ring 1 is configured to be fixedly sleeved on a driving shaft of the scroll compressor, specifically, the fixing ring 1 has a circular ring-shaped central portion 10, a central hole 100 is formed in the central portion 10, and an eccentric shaft section of the driving shaft penetrates through the central hole 100 and is fixedly connected to the positioning ring through a shaft hole matching relationship so that the driving shaft drives the positioning ring to synchronously rotate.

The counterweight 2 is configured to be connected to the stationary ring 1, and the stationary ring 1 and the counterweight 2 are engaged by the matched first serrated surface 110 and second serrated surface 200, the first serrated surface 110 being provided on the stationary ring 1 and the second serrated surface 200 being provided on the counterweight 2.

Obviously, compare with two splice adoption plane cooperation of split type balancing piece among the prior art, the scroll compressor of this disclosure uses split type balancing piece, and split type balancing piece's solid fixed ring 1 and balancing weight 2 are through assorted first serrated surface 110 and second serrated surface 200 interlock, the area of contact between solid fixed ring 1 and balancing weight 2 has been increased, joint strength between the two has been strengthened, even if the balancing weight also can guarantee split type balancing piece's wholeness when receiving great centrifugal force, thereby scroll compressor's operational reliability has been guaranteed. That is, the fixing ring 1 and the balancing weight 2 of the balancing weight of the present disclosure adopt a serrated matching structure, the area of the same space for internal matching is increased multiple times, the stress level is effectively reduced, and the capability of resisting centrifugal force is improved.

With continued reference to fig. 7 and 8, the fixing ring 1 of the present disclosure has a circular ring-shaped center portion 10, the center portion 10 has a center hole 100 for connection with a drive shaft, and a part of the outer peripheral portion of the fixing ring 1 extends in opposite directions to form two flanks 11, and a first serrated surface 110 is provided substantially on the two flanks 11.

By this arrangement, the center portion 10 of the fixing ring 1 for connection with the drive shaft can be made small in radial dimension and light in weight, and the first serrated surface 110 can be made large in area by the side wing 11 portion, so that the second serrated surface 200 having an area matching the first serrated surface 110 can be provided on the weight 2, so that the connection strength of both the fixing ring 1 and the weight 2 can be ensured.

With continued reference to fig. 7, in this embodiment, the upper edge of the first serrated surface 110 of the fixing ring 1 of the present disclosure, herein referred to as the upper edge is set with reference to fig. 7, that is, the side of the first serrated surface 110 near the center of the center hole 100 in fig. 7 is upper, and the side far from the center hole 100 is lower.

Specifically, in the present embodiment, the upper edge of the first serrated surface 110 of the fixed ring 1 is smaller than 180 ° with respect to the central angle a of the central hole 100, that is, the first serrated surface 110 is eccentrically disposed with respect to the central hole 100 of the central portion 10, so as to facilitate the construction of the weight 2 eccentrically coupled to the fixed ring 1.

More specifically, in the present embodiment, the central angle a of the upper edge of the first serrated surface 110 of the fixing ring 1 with respect to the central hole 100 is smaller than 170 ° and larger than 160 °.

As described above, the housing has the accommodation chamber and the thrust surface through hole communicating with the accommodation chamber, and the thrust surface through hole is provided on the thrust surface of the support orbiting scroll on the housing.

Alternatively, in one embodiment, the frame is provided with a radial through hole, the balancing weight 2 is configured to be placed in the accommodating cavity through the radial through hole, and then the balancing weight 2 is pushed to move to a preset position along a radial direction close to the driving shaft, and finally the balancing weight 2 is connected to the fixing ring 1.

Based on this kind of structure, the assembly method of split type balancing piece of this disclosure is put balancing weight 2 into the holding intracavity through thrust face through-hole or radial through-hole, then promotes balancing weight 2 and radially removes to the preset position for solid fixed ring 1, and is last with balancing weight 2 fixed connection on solid fixed ring 1.

The balance weight can be mounted in the frame to keep a better balance effect, factors of limiting the overall outer diameter of the balance weight by the size of the through hole of the thrust surface can be eliminated, and the balance weight with the proper outer diameter can be selected according to actual needs, so that the whole machine of the scroll compressor is reliable, low in cost and good in balance effect.

Specifically, when the fixing ring 1 and the weight 2 are assembled, the fixing ring 1 is previously installed on the driving shaft, and the weight 2 is configured to move to a preset position with respect to the second serrated surface 200 in a radial direction of the central hole 100 of the fixing ring 1 under an external force so that the first serrated surface 110 and the second serrated surface 200 are engaged.

In order to reduce the resistance of the weight 2 to the movement of the fixing ring 1, in this embodiment, the weight of the present disclosure further includes a guiding structure configured to move the weight 2 along a predetermined path relative to the weight 2 when assembled, and maintain a predetermined distance between the first serrated surface 110 and the second serrated surface 200, and engage the first serrated surface 110 and the second serrated surface 200 after the weight 2 is moved to a predetermined position.

So set up, when solid fixed ring 1 and balancing weight 2 are assembled, after putting balancing weight 2 into holding the intracavity from thrust face through-hole or radial through-hole, external force promotes balancing weight 2 and moves the in-process for solid fixed ring 1, keeps the preset distance between first serrated face 110 and the second serrated face 200, and the concrete numerical value of preset distance is with avoiding first serrated face 110 and second serrated face 200 direct contact as the benchmark under holding the chamber space and allowing, does not do not specifically limit here.

The external force required for pushing the balancing weight 2 to move is small, and the first serrated surface 110 and the second serrated surface 200 are engaged until the balancing weight 2 reaches the preset position, so that the centering of the first mounting hole 12 on the fixed ring 1 and the second mounting hole 201 on the balancing weight 2 is ensured, and finally the balancing weight 2 is fixedly connected on the fixed ring 1 by penetrating the first mounting hole 12 and the second mounting hole 201 through bolts or screws.

In detail, referring to fig. 5 and 6, in the present embodiment, the guiding structure of the present disclosure includes a guiding groove 202 formed on the balancing weight 2, the guiding groove 202 extends along the moving direction of the balancing weight 2 relative to the fixing ring 1, that is, the guiding groove 202 extends along the preset path of the balancing weight 2 moving relative to the fixing ring 1, and the guiding groove 202 further has a positioning hole 203 therein.

Referring again to fig. 7 and 8, in this embodiment, the guide structure of the present disclosure further includes a guide post 101 provided on the fixing ring 1.

Based on the above structure, when assembling the fixed ring 1 and the counterweight 2, the fixed ring 1 is mounted on the driving shaft in advance, then the relative positions of the counterweight 2 and the fixed ring 1 are adjusted, so that the guide post 101 of the fixed ring 1 is inserted into the guide groove 202 on the counterweight 2, then the counterweight 2 is pushed to move along the extending direction of the guide groove 202 relative to the fixed ring 1, in this process, the first serrated surface 110 of the fixed ring 1 and the second serrated surface 200 of the counterweight 2 have a preset distance, so that the first serrated surface 110 and the second serrated surface 200 are not contacted, and the counterweight 2 is pushed continuously, when the guide post 101 is inserted into the positioning hole 203 in the guide groove 202, the counterweight 2 is stopped, the first serrated surface 110 and the second serrated surface 200 are snapped, and finally the counterweight 2 is fixedly connected on the fixed ring 1 through bolts.

Obviously, in the above embodiment, the guide post 101 is disposed on the fixing ring 1, and the guide groove 202 matched with the guide post is disposed on the balancing weight 2, it will be understood that, on the basis of satisfying the guiding function of the balancing weight 2 moving relative to the fixing ring 1, the guide post 101 and the guide groove 202 may be disposed reversely, that is, the guide post 101 is disposed on the balancing weight 2, the guide groove 202 is disposed on the fixing ring 1, and of course, the positioning hole 203 is disposed in the guide groove 202 of the fixing ring 1.

Based on this structure, when assembling the fixed ring 1 and the counterweight 2, the fixed ring 1 is mounted on the driving shaft in advance, then the relative positions of the counterweight 2 and the fixed ring 1 are adjusted, so that the guide post 101 of the counterweight 2 is inserted into the guide groove 202 on the fixed ring 1, then the counterweight 2 is pushed to move along the extending direction of the guide groove 202 relative to the fixed ring 1, in this process, a preset distance is provided between the first serrated surface 110 of the fixed ring 1 and the second serrated surface 200 of the counterweight 2, so that the first serrated surface 110 and the second serrated surface 200 are not contacted, and the counterweight 2 is pushed continuously, when the guide post 101 is inserted into the positioning hole 203 in the guide groove 202, the counterweight 2 is stopped, the first serrated surface 110 and the second serrated surface 200 are stopped, and finally the counterweight 2 is fixedly connected to the fixed ring 1 through bolts.

Further, in the present embodiment, the guide groove 202 of the present disclosure is inclined from the first end portion toward the second end portion, which is the end portion provided with the positioning hole 203, in the direction in which the first serrated surface 110 approaches the second serrated surface 200.

So set up, the first serrated surface 110 and the second serrated surface 200 move to be close to each other gradually from keeping the preset distance in the moving process of the balancing weight 2 relative to the fixed ring 1 until the first serrated surface 110 and the second serrated surface 200 are completely meshed when the guide post 101 is clamped into the positioning hole 203 of the guide groove 202, so that the relative movement of the balancing weight 2 and the fixed ring 1 is relatively stable.

With continued reference to fig. 5 and 7, in this embodiment, the scroll compressor of the present disclosure includes three guiding structures, and the three guiding structures are arranged in a triangle, so as to perform a better guiding function, and further improve the stability of the movement of the counterweight 2 relative to the fixing ring 1.

In addition, referring to fig. 5, in the present embodiment, the balancing weight 2 of the present disclosure has a "C" shape, that is, a partial ring structure with a notch, and its central angle B is smaller than 180 ° and is preferably smaller than 170 ° and larger than 160 °, that is, the central angle B of the balancing weight 2 is substantially consistent with the central angle a of the upper edge of the first serrated surface 110 of the fixing ring 1 with respect to the center of the center hole 100.

When the fixing ring 1 and the counterweight 2 are assembled, the central hole 100A of the fixing ring 1 and the central angle B of the counterweight 2 are substantially coaxial.

By the arrangement, the whole stress of the balance block can be balanced.

As described above, the fixing ring 1 and the balancing weight 2 of the balancing weight of the present disclosure adopt a serrated matching structure, and the area of the matching in the same space is increased multiple times, which effectively reduces the stress level and improves the capability of resisting centrifugal force. In order to better understand the advantages of the weight of the present disclosure over the existing weight, the difference between them is analyzed from the force bearing angle with reference to fig. 9 to 12, wherein fig. 9 is a schematic diagram of the distribution of local stress (unit: MPa) of the fixing ring 1 of the existing weight, fig. 10 is a schematic diagram of the distribution of stress (unit: MPa) on the first saw tooth surface 110 of the fixing ring 1 of the weight of the present disclosure in one embodiment, and fig. 11 is a schematic diagram of the distribution of stress (unit: MPa) on the first saw tooth surface 110 of the fixing ring 1 of the weight of the present disclosure in one embodiment, and fig. 12 is a schematic diagram of the distribution of deformation (unit: mm) of the weight of the present disclosure in the diameter direction in one embodiment.

As can be seen from comparison of fig. 9 and 11: the weight of the present disclosure is much less stressed than prior weights.

As can be seen from comparison of fig. 10 and fig. 12: the deformation amount of the balance weight in the diameter direction is much smaller than that of the conventional balance weight in the diameter direction.

The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims (10)

1. A counterweight for a scroll compressor, said counterweight comprising:

a fixing ring configured to be fixedly fitted over a driving shaft of the scroll compressor;

a counterweight configured to be coupled to the stationary ring; and the fixed ring is meshed with the balancing weight through a first serrated surface and a second serrated surface which are matched, the first serrated surface is positioned on the fixed ring, and the second serrated surface is positioned on the balancing weight.

2. The weight according to claim 1, wherein the fixing ring has a circular ring-shaped center portion having a center hole for connection with the drive shaft, and further has two flanks extending in opposite directions from a part of an outer peripheral portion of the center portion, the first saw tooth face being provided on the two flanks.

3. The weight of claim 2, wherein an upper edge of the first serrated surface is less than 180 ° relative to a central angle a of the central bore.

4. A counterweight according to claim 3, characterized in that the central angle a of the upper edge of the first serrated surface with respect to the central hole is smaller than 170 ° and larger than 160 °.

5. The weight of any one of claims 1 to 4, wherein, when assembled, the weight is configured to move radially relative to a second serrated surface to a preset position along a central bore of the retaining ring under an external force until the first serrated surface engages the second serrated surface;

the counterweight further includes a guide structure configured to move the counterweight relative to the counterweight along a predetermined path during assembly, maintain a predetermined distance between the first and second serrated surfaces, and engage the first and second serrated surfaces after the counterweight is moved to a predetermined position.

6. The weight of claim 5, wherein the weight comprises three guide structures, the three guide structures being triangularly distributed.

7. The weight of claim 5, wherein the guide structure comprises a guide groove, a guide post and a positioning hole arranged in the guide groove, one of the guide groove and the guide post is arranged on the fixed ring, the other guide groove is arranged on the weight, and the guide groove extends along the preset path direction;

when the fixing ring and the balancing weight are assembled, the guide post moves along the guide groove, and a preset distance is kept between the first serrated surface and the second serrated surface until the first serrated surface and the second serrated surface are meshed when the guide post is inserted into the positioning hole.

8. The weight according to claim 7, wherein the extending direction of the guide groove from the first end portion toward the second end portion is inclined toward the direction in which the first saw tooth face approaches the second saw tooth face, wherein the second end portion is provided with the positioning hole.

9. The weight of any one of claims 2 to 4, wherein the weight is in a "C" configuration, and wherein the central angle of the weight and the central bore of the retaining ring are substantially coaxial when assembled.

10. A scroll compressor, the scroll compressor comprising:

a frame configured to be connected to a fixed scroll of the scroll compressor and to support a movable scroll of the scroll compressor, the frame having a receiving chamber and a thrust surface through hole communicating with the receiving chamber, the thrust surface through hole being opened on a thrust surface of the frame supporting the movable scroll;

the driving shaft penetrates through the frame and the thrust surface through hole to drive the movable vortex plate to move in a translational mode relative to the fixed vortex plate;

a counterweight arranged on the drive shaft and configured to provide a counter-centrifugal force or force moment to balance the amount of dynamic unbalance created by the eccentric shaft section of the drive shaft, in particular a counterweight according to any of claims 1 to 9.