CN217761308U - Rotary driving assembly and rotary compressor - Google Patents

Abstract

The utility model provides a rotary driving subassembly for rotary compressor, rotary driving subassembly include the rotor and drive and rotatory drive shaft by the rotor, and rotary driving subassembly is still including the balancing piece subassembly of installing in the axial tip department of rotor, and the balancing piece subassembly includes balancing piece and balancing piece cover, and wherein, at least partly at the axial of balancing piece cover lies in between rotor and the balancing piece. The utility model also provides a rotary compressor. According to the utility model discloses a rotary drive subassembly and rotary compressor, simple structure not only, easily production and installation, low cost moreover.

Description

Rotary driving assembly and rotary compressor

Technical Field

The utility model relates to a rotary compressor field, more specifically relates to a rotary drive subassembly for rotary compressor.

Background

This section provides background information related to the present invention, which does not necessarily constitute prior art.

Rotary compressors, such as scroll compressors, typically compress a working fluid by rotating a drive shaft with a rotor and driving an eccentric member with the drive shaft to drive a compression member. Since the centrifugal force or the centrifugal moment generated by the rotation of the eccentric member may cause vibration, noise, etc. of the compressor, a balance weight assembly is generally provided on the rotating member, for example, the rotor, to provide a reverse centrifugal force or centrifugal moment to balance the unbalance amount generated by the eccentric member. The balance weight assembly may be disposed above and/or below the rotor, and includes a balance weight fixedly connected to the rotor aluminum column and a balance weight cover fixed to the driving shaft by a fixing member, such as a snap spring.

Therefore, there is a problem that the fixing manner of the weight cover is complicated and the cost is high. In addition, with the development of the scroll compressor with a large number of scroll compressors, a larger and heavier balance weight is required to adjust the dynamic balance of the compressor, so that the problems of insufficient connection strength between the balance weight and the rotor aluminum ingot, easy failure and the like exist.

SUMMERY OF THE UTILITY MODEL

The general outline of the present invention is provided in this section, not a full scope of the invention or a full disclosure of all the features of the invention.

One of the objects of the present invention is to provide a rotary driving assembly for a rotary compressor, which comprises a rotor, a driving shaft and a balance weight assembly, wherein the balance weight assembly comprises a balance weight and a balance weight cover, and the balance weight cover is disposed between the rotor and the balance weight in the axial direction, so that the balance weight cover is fixedly installed without an additional fixing member, and the rotary driving assembly is simpler to produce and install and has lower cost.

Another object of the present invention is to provide a rotary drive assembly for a rotary compressor, the rotary drive assembly includes a rotor, a driving shaft, and a balance weight assembly, the balance weight assembly includes a balance weight and a balance weight cover, wherein a weight portion of the balance weight protrudes toward an axial end of the rotor along an axial direction, which not only makes a press-fitting operation of the balance weight more convenient, makes a structure of the balance weight assembly more compact, but also facilitates the balance weight and the balance weight cover to jointly form a substantially cylindrical outer contour, thereby reducing stirring of a peripheral fluid (e.g., oil) and avoiding a reduction in efficiency caused thereby.

It is another object of the utility model to provide a rotary driving subassembly for rotary compressor, this rotary driving subassembly includes rotor, drive shaft and balancing piece subassembly, and the balancing piece subassembly includes balancing piece and balancing piece cover, and especially to the balancing piece subassembly that sets up in the rotor below, the balancing piece (especially set up the lower balancing piece below the rotor) is connected with the rotation axis interference, has not only increased the fixed connection intensity of balancing piece, has improved the reliability, and the pressure equipment operation is more convenient moreover, specially adapted number of pieces scroll compressor.

Still another object of the present invention is to provide a rotary compressor having the above rotary driving assembly, which is not only simple in structure, but also more convenient in production and installation, and low in cost and reliable in performance.

According to the utility model discloses an aspect provides a rotary driving subassembly for rotary compressor, rotary driving subassembly include the rotor and drive and rotatory drive shaft by the rotor, and rotary driving subassembly is still including the balancing piece subassembly of installing in the axial tip department of rotor, and the balancing piece subassembly includes balancing piece and balancing piece cover, and wherein, at least a part of balancing piece cover is located between rotor and the balancing piece in the axial.

Optionally, the counterweight cover is fixed in position by at least a portion thereof being sandwiched axially between the rotor and the counterweight.

Optionally, the weight cover includes a fixing portion and a housing portion, the fixing portion includes a first surface and an opposite second surface, the first surface of the fixing portion is in contact with the axial end face of the rotor, the second surface of the fixing portion is in contact with the weight, and the housing portion protrudes from the second surface of the fixing portion in a direction axially away from the rotor.

Optionally, the weight cover includes a recess recessed from the first surface of the fixing portion toward a direction away from the rotor.

Optionally, the weight includes a mounting portion and a weight portion protruding from a first surface of the mounting portion facing the rotor in a direction axially toward the rotor.

Optionally, the mounting portion includes a through hole for the drive shaft to pass through, and the mounting portion is an interference fit with the drive shaft.

Optionally, the counterweight and counterweight cover have complementary structures such that the counterweight assembly has a substantially cylindrical outer profile.

Optionally, the weight block includes a first arc-shaped section, a second arc-shaped section formed with the weight portion, and an axially-extending cutting portion formed at a junction of the first arc-shaped section and the second arc-shaped section of the weight block, and the weight block cover includes a first arc-shaped section, a second arc-shaped section formed with the casing portion, and an axially-extending embedding portion formed at a junction of the first arc-shaped section and the second arc-shaped section of the weight block cover, the embedding portion being configured in a groove form to receive the cutting portion.

Optionally, the balance block assembly is mounted below the rotor.

According to another aspect of the present invention, a rotary compressor is provided, comprising a rotary drive assembly according to the preceding description.

Generally, according to the utility model discloses a rotary drive subassembly and rotary compressor bring one of following beneficial effect at least: the balance block cover is fixed without an additional fixing component, so that the production and the installation are easy, and the cost is reduced; the balance block and the balance block cover jointly form a roughly cylindrical outer contour, so that the stirring of peripheral fluid is reduced, and the influence on the efficiency of the compressor is avoided; the balance block is easier to press and more reliable in fixed connection, and is particularly suitable for large-number scroll compressors.

Drawings

The features and advantages of one or more embodiments of the present invention will become more readily apparent from the following description taken in conjunction with the accompanying drawings. The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. The figures are not drawn to scale, and some features may be exaggerated or minimized to show details of particular components. In the drawings:

fig. 1 is a longitudinal sectional view of a rotary compressor according to the present invention;

fig. 2 is a longitudinal sectional view of a rotary drive assembly according to the present invention;

FIG. 3 is a schematic perspective view of a counterbalance according to the present invention;

FIG. 4 is a schematic perspective view of a weight housing according to the present invention;

fig. 5 is a schematic perspective view of a balance block assembly according to the present invention;

fig. 6 is a top view of a balance block assembly according to the present invention;

FIG. 7 is a schematic perspective view of a rotor and a weight according to a comparative example; and

fig. 8 is a longitudinal sectional view of a rotary drive assembly according to a comparative example.

Detailed Description

The preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are illustrative only and do not constitute a limitation of the invention and its applications.

The general construction and operation principle of the rotary compressor according to the present invention will be described first with reference to fig. 1. The scroll compressor is described herein as an example, but it should be understood that the present invention is not limited to the scroll compressor. As shown in fig. 1, the turbo compressor 100 includes a casing 10, a compression mechanism including a fixed scroll member 20 and a movable scroll member 30, a drive shaft 60 for driving the compression mechanism, a motor 80, and a main bearing housing 50 and a sub bearing housing 70 respectively located at both ends of the drive shaft 60. Orbiting scroll member 30 includes an end plate 31, a boss 33 formed on one side of end plate 31, and a scroll blade 32 formed on the other side of end plate 31. The non-orbiting scroll member 20 includes an end plate 21 and scroll blades 22 formed on one side of the end plate 21. A series of compression pockets of decreasing volume from radially outer to radially inner sides are formed between the scroll blades 22 of the non-orbiting scroll member 20 and the scroll blades 32 of the orbiting scroll member 30 to compress the working fluid.

Compression of the working fluid in the compression chambers is achieved by rotation of the drive shaft 60 by the motor 80. Specifically, the motor 80 includes a stator 81 and a rotor 82, the stator 81 is fixedly connected to the housing 10, and the rotor 82 is fixedly connected to the driving shaft 60. When the motor 80 is activated, the rotor 82 rotates, thereby rotating the drive shaft 60. One end of the drive shaft 60 (shown as the upper end of the drive shaft 60 in fig. 1) is supported by a main bearing provided in the main bearing housing 50. An eccentric crank pin 61 is provided at the upper end of the drive shaft 60, and a relief bush 62 is provided between the eccentric crank pin 61 and the boss 33 of the orbiting scroll member 30. Orbiting scroll member 30 is driven by rotation of drive shaft 60 by motor 80, and orbiting scroll member 30 will be rotated in translation relative to non-orbiting scroll member 20 (i.e., the central axis of orbiting scroll member 30 rotates about the central axis of non-orbiting scroll member 20, but orbiting scroll member 30 does not itself rotate about its central axis) to effect compression of the fluid.

During operation of the scroll compressor 100, centrifugal force or centrifugal moment created by rotation of the eccentric member can cause vibration of the compressor. Generally, a balance weight assembly is provided on the rotating member to provide a reverse centrifugal force or a centrifugal moment to balance the amount of unbalance generated by the eccentric member. The shape, configuration and location of the balance block assembly may vary depending on the particular application requirements. As shown in fig. 1, the balance weight assembly may include an upper balance block assembly (including an upper balance weight 42) disposed in the recess of the main bearing housing 50 above the rotor 82 and a lower balance block assembly (including a lower balance weight 41 and a lower balance weight cover 43) disposed below the rotor 82, but it may be understood by those skilled in the art that the compressor may include only the upper balance block assembly or the lower balance block assembly or other balance block assemblies other than the upper balance block assembly and the lower balance block assembly.

The following balancing assembly is a preferred example to illustrate the rotary drive assembly according to the invention. In this context, a rotary drive assembly according to the present invention is defined as an assembly consisting of a rotor, a drive shaft and a weight assembly. As shown in fig. 2, the rotor 82 has a substantially cylindrical shape, and the drive shaft 60 is fixedly connected to the rotor 82 through a center hole of the rotor 82. The lower balance weight assembly is mounted at one axial end portion (axially lower end portion) of the rotor 82 and is opposed to one axial end face (axially lower end face) of the rotor 82.

Fig. 3 to 6 show a specific structure of the lower balance block assembly. The lower weight assembly 41 includes a lower weight 41 and a lower weight cover 43. As shown in fig. 3, the lower balancer 41 includes a substantially arc-shaped weight portion 412 and a substantially annular mounting portion 411 for mounting the lower balancer 41 to the drive shaft 60. In other words, in the circumferential direction, the lower weight 41 may include a first arc-shaped section 414 constituted by a part of the mounting portion 411 and a second arc-shaped section 416 constituted by another part of the mounting portion 411 in cooperation with the weight portion 412. The second arcuate segment 416 has a larger radius of curvature than the first arcuate segment 414. The mounting portion 411 includes a first surface 417 facing the rotor 82 and a second surface 418 opposite to the first surface 417, and the weight portion 412 protrudes from the first surface 417 of the mounting portion 411 in a direction toward the rotor 82 in the axial direction. The mounting portion 411 is also formed at the center thereof with a mounting hole 413 through which the driving shaft 60 passes.

As shown in fig. 4, the lower-weight cover 43 includes a substantially arc-shaped outer shell portion 432 and a substantially annular fixing portion 431 for fixing the lower-weight cover 43 in position with respect to the drive shaft 60. In other words, in the circumferential direction, the lower-weight cover 43 may include a first arc-shaped section 434 constituted by a part of the fixing portion 431 and a second arc-shaped section 436 constituted by another part of the fixing portion 431 in cooperation with the outer shell portion 432. The second arcuate section 436 has a larger radius of curvature than the first arcuate section 434. The fixing part 431 includes a first surface 437 facing the rotor 82 and a second surface 438 opposite to the first surface 437, and the housing part 432 protrudes from the second surface 438 of the fixing part 431 toward a direction away from the rotor 82. The fixing portion 431 has a through hole 433 formed at the center thereof through which the driving shaft 60 passes. The fixing portion 431 further includes a recess 430 recessed from the first surface 437 of the fixing portion 431 toward a direction away from the rotor 82, thereby reducing the entire weight of the lower weight cover 43 to form an unbalance amount with the lower weight 41.

Preferably, the lower balance weight 41 and the lower balance weight cover 43 are configured to have completely complementary outer profile shapes, such that when the lower balance weight 41 and the lower balance weight cover 43 are assembled together to form the lower balance weight assembly, the lower balance weight assembly has a substantially cylindrical outer profile, thereby reducing the agitation of the peripheral fluid (e.g., oil in an oil sump located at the bottom of the compressor) by the balance weight assembly and avoiding, for example, an increase in oil circulation rate and a decrease in system efficiency caused thereby. Specifically, as shown in fig. 5 and 6, the first arc-shaped section 414 of the lower weight 41 and the first arc-shaped section 434 of the lower weight cover 43 have substantially the same radius of curvature, and the second arc-shaped section 416 of the lower weight 41 and the second arc-shaped section 436 of the lower weight cover 43 have substantially the same radius of curvature. When the lower balance weight 41 and the lower balance weight cover 43 are assembled together, the mounting hole 413 of the lower balance weight 41 is aligned with the through hole 433 of the lower balance weight cover 43, the first surface 417 of the lower balance weight 41 abuts against the second surface 438 of the lower balance weight cover 43, the first arc-shaped section 414 of the lower balance weight 41 is located below the first arc-shaped section 434 of the lower balance weight cover 43 and almost completely overlaps with the first arc-shaped section 434 of the lower balance weight cover 43, so that the outer shell portion 432 of the lower balance weight cover 43 covers the radial outer side surface of the first arc-shaped section 414 of the lower balance weight 41, and the weight portion 412 of the lower balance weight 41 covers the radial outer side surface of the first arc-shaped section 434 of the lower balance weight cover 43, so that the radial outer side surface of the second arc-shaped section 416 of the lower balance weight 41 and the radial outer side surface of the lower balance weight cover 43 together form a substantially cylindrical outer peripheral surface of the balance weight assembly.

Preferably, the lower balance weight 41 is formed at the junction of the first arc section 414 and the second arc section 416 thereof with a cutting portion 415 extending axially from the second surface 418 of the mounting portion 411 to the top end surface of the weight portion 412, and the lower balance weight cover 43 is formed at the junction of the first arc section 434 and the second arc section 436 thereof with an embedding portion 435 extending from the first surface 417 of the fixing portion 431 to the bottom end surface of the housing portion 432, the embedding portion 435 being configured in the form of a groove extending axially for accommodating the cutting portion 415 even in abutment with the cutting portion 415 when the lower balance weight 41 and the lower balance weight cover 43 are assembled together, thereby making the assembly between the lower balance weight 41 and the lower balance weight cover 43 more stable and facilitating a smooth transition at the junction of the radially outer side surface of the lower balance weight 41 and the radially outer side surface of the lower balance weight cover 43 to further reduce the influence of the lower balance weight assembly on the peripheral fluid.

When mounting the balance block assembly to the rotor 82 and the drive shaft 60 to form the rotary drive assembly, referring to fig. 2, the lower balance weight 41 is fixed to the drive shaft 60, and preferably, the fixing portion 431 of the lower balance weight cover 43 is sandwiched between the lower balance weight 41 (the mounting portion 411) and the rotor 82 (i.e., the first surface 437 of the fixing portion 431 is in contact with the axially lower end face of the rotor 82, and the second surface 437 of the fixing portion 431 is in contact with the first surface 417 of the mounting portion 411 of the lower balance weight 41), so that the lower balance weight cover 43 is also fixed relative to the drive shaft 60. Of course, it can be understood by those skilled in the art that even if the fixing portion 431 of the lower-balance-weight cover 43 does not contact the rotor 82 and/or the lower balance weight 41, the lower-balance-weight cover 43 can be substantially fixed relative to the drive shaft during operation of the compressor because the fixing portion 431 of the lower-balance-weight cover 43 is axially located between the rotor 82 and the lower balance weight 41, and because of the structural limit between the lower-balance-weight cover 43 and the lower balance weight 41.

Preferably, an interference fit is formed between the mounting portion 411 of the lower weight 41 and the drive shaft 60. Since the entire annular inner surface of the mounting hole 413 at the center of the mounting portion 411 can contact the driving shaft 60 and form an interference fit, the contact area is large, and therefore, the connection between the lower balance weight 41 and the driving shaft 60 is more stable.

The advantages and effects of the rotary drive assembly according to the present invention will be described below with reference to comparative examples shown in fig. 7 and 8. Referring to fig. 8, the rotary drive assembly according to the comparative example is composed of a rotor 82', a drive shaft 60, and a lower balance block assembly. The rotor 82' is generally cylindrical and the drive shaft 60 is fixedly coupled to the rotor 82' by passing through a central bore of the rotor 82 '. The lower balance weight assembly is mounted at one axial end portion (axially lower end portion) of the rotor 82 and is opposed to one axial end face (axially lower end face) of the rotor 82'.

Fig. 7 shows a perspective view of the lower balance weight assembled with the rotor. An aluminum column 822' for mounting the lower balance weight 41' is provided on the axial lower end surface 821' of the rotor 82', that is, the aluminum column 822' extends axially downward from the axial lower end surface 821' of the rotor 82 '. The lower balancer 41' includes a substantially circular-arc-shaped counterweight portion 412' and a substantially circular-arc-shaped mounting portion 411' for mounting the lower balancer 41' to the rotor 82 '. The mounting part 411' includes a first surface 417' facing the rotor 82' and a second surface 418' opposite to the first surface 417', and a weight part 412' protrudes from the second surface 418' of the mounting part 411' in the axial direction toward a direction away from the rotor 82', the weight part 412' being formed in a middle section of the mounting part 411' in the circumferential direction. That is, as shown in fig. 7, the mounting portion 411 'of the lower weight 41' includes two mounting end portions protruding from the weight portion 412 'in the circumferential direction, and each mounting end portion includes a mounting hole through which the aluminum pillar 822' passes. The lower balance weight 41' is riveted or screwed to the rotor 82' by inserting aluminum posts 822' into the respective mounting holes of the two mounting ends. However, for a large number of scroll compressors, a larger and heavier lower balance weight is generally required, and the manner in which such a lower balance weight is connected to the aluminum post in the comparative example is insufficient in connection strength, with the risk of fracture failure. Compared with the comparative example, in the rotary driving assembly according to the present invention, the lower balance weight 41 is fixed relative to the driving shaft 60 by interference fit with the driving shaft 60, the connection strength is greater, and the lower balance weight is not easy to break or fail, and is particularly suitable for the scroll compressor with large number of pieces. In addition, in the rotary driving assembly according to the present invention, since the weight portion 412 of the lower balance weight 41 protrudes toward the direction of the rotor, the second surface 418 of the lower balance weight 41 is configured as a smooth press-fitting surface with a large area, so that the press-fitting operation of the lower balance weight 41 to the driving shaft 60 is more convenient.

In addition, referring to fig. 8, in the rotary drive assembly according to the comparative example, the lower weight cover 43 'includes a substantially circular arc-shaped outer shell portion 432' and a substantially annular fixing portion 431 'for fixing the lower weight cover 43' in position with respect to the drive shaft 60. The fixing part 431' includes a first surface facing the rotor 82' and a second surface opposite to the first surface, and the housing part 432' protrudes from the first surface of the fixing part 431' toward the rotor 82 '. The center of the fixing portion 431 'is formed with a through hole through which the driving shaft 60 passes, and at the position of the through hole, a snap spring 45' is further provided on the second surface of the fixing portion 431 'for fixing the lower-weight cover 43' in position with respect to the driving shaft 60. Compared with this comparative example, in the rotary drive assembly according to the present invention, the lower balance weight cover 43 can be fixed in place with respect to the drive shaft 60 without an additional fixing member (e.g., a snap spring 45), and the structure is simpler, the assembly is more convenient, and the cost is lower.

In addition, after the lower balancer is assembled according to the comparative example, the first surface 417' of the mounting portion 411' of the lower balancer 41' is in contact with the axial lower end surface 821' of the rotor 82', the second surface 418' of the mounting portion 411' of the lower balancer 41' is opposite to the first surface of the fixing portion 431' of the lower balancer cover 43', and the tip end surface of the outer shell portion 432' of the lower balancer cover 43' may be in contact with the axial lower end surface 821' of the rotor 82' and substantially cover a portion of the axial lower end surface 821' of the rotor 82' that is not covered by the first surface 417' of the mounting portion 411' of the lower balancer 41 '. However, since the connection structure of the lower balance weight 41' and the rotor aluminum post 822' is more complicated, it is difficult to configure the lower balance weight cover 43' into a structure completely complementary to the lower balance weight 41', and it is difficult to form a complete substantially cylindrical outer profile together with the lower balance weight 41', so that the lower balance weight assembly may have a large stirring effect on the peripheral fluid, thereby having an adverse effect. In contrast to this comparative example, in the rotary drive assembly according to the present invention, the lower balance weight 41 and the lower balance weight cover 43 are configured to have completely complementary outer contour shapes, so that the lower balance block assembly has a complete substantially cylindrical outer contour, thereby reducing the agitation of the surrounding fluid by the balance weight assembly and avoiding an increase in, for example, the oil circulation rate and a decrease in the efficiency of the compressor system caused thereby.

In addition, it should be noted that although the rotary driving assembly preferably includes the lower balance block assembly herein, it can be understood by those skilled in the art that the upper balance block assembly may also adopt a similar configuration and obtain corresponding effects in the rotary compressor.

Although various embodiments of the present invention have been described in detail herein, it is to be understood that the invention is not limited to the precise embodiments herein described and illustrated, and that other modifications and variations may be effected by one skilled in the art without departing from the spirit and scope of the invention. All such variations and modifications are intended to fall within the scope of the present invention. Moreover, all the components described herein can be replaced by other technically equivalent components.

Claims (10)

1. A rotary drive assembly for a rotary compressor, the rotary drive assembly including a rotor and a drive shaft rotated by the rotor,

the rotary drive assembly further includes a counterweight assembly mounted at an axial end of the rotor, the counterweight assembly including a counterweight and a counterweight cover, wherein at least a portion of the counterweight cover is axially positioned between the rotor and the counterweight.

2. The rotary drive assembly for a rotary compressor of claim 1, wherein the counterweight cover is fixed in position by at least a portion thereof being axially sandwiched between the rotor and the counterweight.

3. The rotary drive assembly for a rotary compressor according to claim 1, wherein the weight cover includes a fixing portion and a housing portion, the fixing portion including a first surface and an opposite second surface, the first surface of the fixing portion being in contact with an axial end surface of the rotor, the second surface of the fixing portion being in contact with the weight, the housing portion projecting from the second surface of the fixing portion in a direction axially away from the rotor.

4. The rotary drive assembly for a rotary compressor according to claim 3, wherein the weight cover includes a recess that is recessed from the first surface of the fixing portion toward a direction away from the rotor.

5. The rotary drive assembly for a rotary compressor according to any one of claims 1 to 4, wherein the balance weight includes a mounting portion and a weight portion protruding from a first surface of the mounting portion facing the rotor in a direction axially toward the rotor.

6. The rotary drive assembly for a rotary compressor of claim 5, wherein the mounting portion includes a through hole for the driving shaft to pass through, and the mounting portion is interference-fitted with the driving shaft.

7. A rotary drive assembly for a rotary compressor according to any one of claims 1 to 4, wherein the counterweight and counterweight cover have complementary configurations such that the counterweight assembly has a substantially cylindrical outer profile.

8. The rotary drive assembly for a rotary compressor according to any one of claims 1 to 4, wherein the balance weight includes a first arc-shaped section, a second arc-shaped section formed with a weight portion, and an axially extending cutting portion formed at an intersection of the first arc-shaped section and the second arc-shaped section of the balance weight,

the balance weight cover comprises a first arc-shaped section, a second arc-shaped section formed with a shell part and an embedding part which is formed at the joint of the first arc-shaped section and the second arc-shaped section of the balance weight cover and extends along the axial direction,

the embedding part is configured in a groove form to accommodate the cutting part.

9. A rotary drive assembly for a rotary compressor according to any one of claims 1 to 4, wherein the balance block assembly is mounted below the rotor.

10. A rotary compressor, characterized in that it comprises a rotary drive assembly according to any one of claims 1 to 9.

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