CN111089057A

CN111089057A - Oil supply mechanism for rotary machine and rotary machine

Info

Publication number: CN111089057A
Application number: CN201811245811.2A
Authority: CN
Inventors: 彭楠; 赵小冬; 周启明
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2018-10-24
Filing date: 2018-10-24
Publication date: 2020-05-01

Abstract

The present invention relates to an oil supply mechanism for a rotary machine and a rotary machine including the oil supply mechanism. The rotary machine includes a rotary shaft. The oil supply mechanism includes a main oil supply passage, a bypass oil passage, and a bypass member. The main oil supply passage is formed in the rotary shaft substantially in an axial direction of the rotary shaft. The bypass oil passage is provided in the rotary shaft and communicates with the main oil supply passage to allow a portion of the lubricating oil in the main oil supply passage to flow out through the bypass oil passage. The bypass member is a separate member and is mounted to the outer circumferential surface of the rotary shaft at the bypass oil passage. The bypass member is configured to enable a part of the lubricating oil in the main oil supply passage to be discharged via the bypass oil passage by a centrifugal force according to a rotation speed of the rotary shaft.

Description

Oil supply mechanism for rotary machine and rotary machine

Technical Field

The present invention relates to an oil supply mechanism of a rotary machine and a rotary machine including the same, and more particularly, to a scroll compressor capable of adjusting an oil circulation rate under different compression conditions.

Background

Compressors (e.g., scroll compressors) may be used in, for example, refrigeration systems, air conditioning systems, and heat pump systems. The scroll compressor includes a compression mechanism for compressing a working fluid (e.g., a refrigerant) and a rotary shaft for driving the compression mechanism. Generally, when a compressor is operated, a rotating shaft is rotated to drive a compression mechanism to compress a working fluid, while a lubricant (e.g., a lubricating oil) is supplied to various moving parts (including a bearing, a bushing, a scroll, etc.) or a thrust surface of the compressor via an inner through hole of the rotating shaft. For example, it is necessary to supply lubricant between the orbiting and non-orbiting scroll members of the compression mechanism to improve friction between the orbiting and non-orbiting scroll members, thereby reducing wear and power consumption.

However, a portion of the lubricant is circulated into the system as the compressed working fluid exits the compressor. For the evaluation and analysis of the amount of lubricant, the concept of "oil circulation rate" was introduced. Too large or too small an oil circulation rate is not beneficial to the normal operation of the compressor and the compressor system and affects the performance of the compressor and the compressor system.

In particular, for the inverter scroll compressor, as the rotation speed of the rotating shaft becomes higher, the oil circulation rate becomes higher, for example, the efficiency of the heat exchanger may be reduced, thereby affecting the operation and performance of the compressor system; conversely, as the rotation speed of the rotary shaft decreases, the oil circulation rate becomes smaller, for example, the amount of lubricant supplied to the compression mechanism may become insufficient, thereby causing severe wear of the orbiting and non-orbiting scroll members.

Accordingly, it is desirable in the art to provide a scroll compressor capable of adjusting or controlling the oil circulation rate under different compression conditions.

Disclosure of Invention

This summary is provided to introduce a general summary of the invention, not a full disclosure of the full scope of the invention or all of the features of the invention.

It is another object of the present invention to provide a scroll compressor which is capable of flowing a part of lubricant in an inner through hole of a rotary shaft out of the rotary shaft to adjust or control an oil circulation rate when the rotary shaft thereof is rotated at a high speed.

It is another object of the present invention to provide a scroll compressor which is capable of not only adjusting or controlling the oil circulation rate under different compression conditions, but also maintaining the dynamic balance of the rotary shaft as it rotates.

In order to achieve one or more of the above objects, there is provided an oil supply mechanism of a rotary machine according to the present invention, the rotary machine including a rotary shaft. The oil supply mechanism includes a main oil supply passage, a bypass oil passage, and a bypass member. The main oil supply passage is formed in the rotary shaft substantially in an axial direction of the rotary shaft. The bypass oil passage is provided in the rotary shaft and communicates with the main oil supply passage to allow a portion of the lubricating oil in the main oil supply passage to flow out through the bypass oil passage. The bypass member is a separate member and is mounted to the outer circumferential surface of the rotary shaft at the bypass oil passage. The bypass member is configured to enable a part of the lubricating oil in the main oil supply passage to be discharged via the bypass oil passage by a centrifugal force according to a rotation speed of the rotary shaft.

According to the oil supply mechanism of the present disclosure, since the bypass member is provided, when the rotary shaft rotates at a high speed, the lubricating oil supplied into the main oil supply passage is increased, and a part of the lubricating oil can flow out through the bypass member by the centrifugal force, whereby the oil circulation rate can be reduced. According to the oil supply mechanism of the present disclosure, since the independent bypass member is provided, the bypass member has a wide versatility, and it is not necessary to make much improvement on the rotating shaft. In addition, because the bypass component is a separate component, design flexibility is greater and manufacturing and assembly are facilitated.

In some examples, the oil supply mechanism further includes an oil pumping device installed at an end of the rotating shaft where the lubricating oil is introduced.

In some examples, the oil pumping device is a fixed-amount oil pumping device.

In some examples, the main oil supply passage includes a center oil passage extending from one end portion of the rotation shaft and an eccentric oil passage extending eccentrically from the center oil passage toward the other end portion of the rotation shaft. The bypass oil passage is provided at the center oil passage. Alternatively, the bypass oil passage is provided at the eccentric oil passage and is located on an opposite side to the center axis of the rotating shaft with respect to the center axis of the eccentric oil passage.

In some examples, the bypass member has a first flat portion abutting an outer peripheral surface of the rotary shaft, and the outer peripheral surface of the rotary shaft has a second flat portion abutting the first flat portion of the bypass member. The planar portion is easy to mount and position, and is convenient to transmit torque.

In some examples, the bypass component includes a body fixed to an outer peripheral surface of the rotary shaft, a slider slidable within the body, and a biasing member for applying a biasing force to the slider. The body includes an inner peripheral surface abutting against an outer peripheral surface of the rotary shaft and an outer peripheral surface opposite to the inner peripheral surface. A discharge passage allowing outflow of the lubricating oil is provided in the body.

In some examples, the body has an annular or arcuate shape. In some alternative examples, the body is in the form of a weight.

In some examples, the bypass oil passage is a radial oil passage extending substantially transverse to the main oil supply passage.

In some examples, the slider may abut against an outer circumferential surface of the rotary shaft to close the radial oil passage, and the discharge passage is provided between the inner circumferential surface of the body and the outer circumferential surface of the rotary shaft.

In some examples, the discharge passage is a groove provided on an inner circumferential surface of the body.

In some examples, the oil supply mechanism further includes a bypass extension oil passage provided in the bypass member, the bypass extension oil passage being located between and in fluid communication with the radial oil passage and the discharge passage.

In some examples, the radial oil passage and/or the bypass extension oil passage are in the form of a step having a larger cross-sectional area adjacent the discharge passage and a smaller cross-sectional area adjacent the main supply oil passage.

In some examples, the bypass extension oil passage is configured to allow the slider to slide therein.

In some examples, the bypass extension oil passage extends through the body and a plug is provided at an outer circumferential surface of the bypass extension oil passage adjacent to the body to fix or mount the biasing member between the plug and the slider.

In another aspect of the present disclosure, there is also provided a rotary machine including the above-described oil supply mechanism.

In some examples, the rotary machine includes a scroll compression mechanism, and the rotary shaft is configured to drive the scroll compression mechanism.

Drawings

Features and advantages of one or more embodiments of the present invention will become more readily understood from the following description with reference to the accompanying drawings, in which:

fig. 1 is a perspective view of an oil supply mechanism according to an embodiment of the present disclosure;

FIG. 2 is a cross-sectional schematic view of the oil supply mechanism of FIG. 1;

FIG. 3 is an enlarged partial schematic view of the oil supply mechanism of FIG. 2;

FIG. 4 is a schematic perspective view of a body of a bypass component according to an embodiment of the present disclosure;

fig. 5 is a perspective view of an oil supply mechanism according to another embodiment of the present disclosure;

FIG. 6 is a cross-sectional schematic view of the oil feed mechanism of FIG. 5;

fig. 7 is a partially enlarged schematic view of the oil supply mechanism of fig. 6;

FIG. 8 is a schematic perspective view of a body of a bypass component according to another embodiment of the present disclosure; and

fig. 9 is a longitudinal sectional view showing a scroll compressor to which an oil supply mechanism according to the present disclosure is applied.

Detailed Description

The invention is described in detail below with the aid of exemplary embodiments with reference to the attached drawings. The following detailed description of the invention is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

An oil supply mechanism according to an embodiment of the present disclosure is described below with reference to fig. 1 to 4. As shown, the oil supply mechanism 100 includes a rotary shaft 10 and a bypass member 30. The bypass member 30 is a member independent of the rotary shaft 10, and the bypass member 30 may be fixed to the outer circumferential surface 11 of the rotary shaft 10 by interference fit or by a fastener such as a screw. It will be appreciated that the bypass member 30 may also be secured to the rotatable shaft 10 by any other suitable means. Since the bypass member 30 is independent of the rotary shaft 10, no excessive modification of the rotary shaft 10 is required, and the independent bypass member 30 has better versatility.

The rotary shaft 10 is a long member and includes a longitudinal center axis (rotation axis). The rotary shaft 10 is rotatable about a longitudinal center axis. The rotary shaft 10 is suitable for application in various rotary machines, for example, as a rotary drive member. In some rotary machines, the rotating shaft is often also referred to as a crankshaft. In this context, a rotary machine refers to a mechanical device or system having a rotating shaft, crankshaft, or rotating drive shaft.

A main oil supply passage 12 is provided in the rotary shaft 10. The main oil supply passage 12 extends substantially in the axial direction of the rotary shaft 10. In the illustrated example, the main oil supply passage 12 includes a center oil passage 12a extending from one end portion of the rotary shaft 10 and an eccentric oil passage 12b extending eccentrically from the center oil passage 12a toward the other end portion of the rotary shaft 10. Generally, the center oil passage 12a is adjacent to OR immersed in an oil pool (for example, an oil pool OR in fig. 9) so as to supply the lubricating oil in the oil pool into the rotary shaft 10. When the rotary shaft 10 rotates, the lubricating oil flows in the longitudinal direction of the rotary shaft 10 along the main oil supply passage 12 by the centrifugal force.

In some examples, an oil pumping device (not shown), for example a fixed displacement per revolution fixed displacement oil pumping device, may be provided between the rotating shaft 10 and the oil sump. Examples of the quantitative oil pumping device may include a positive displacement quantitative oil pumping device, a differential quantitative oil pumping device, a diaphragm quantitative oil pumping device, and the like. When the rotation speed of the rotary shaft 10 is higher, particularly in the case of having a quantitative oil pumping device, the amount of the lubricating oil pumped to the inside of the rotary shaft 10 and thus to the movable parts is also greater. This can result in too high an oil circulation rate, which is undesirable in some cases.

For this purpose, a bypass oil passage 20 is further provided on the rotary shaft 10. The bypass oil passage 20 is configured to be able to flow out a part of the lubricating oil in the main oil supply passage 12 through the bypass oil passage 20, for example, to return to an oil sump. When the rotation speed of the rotating shaft 10 reaches a predetermined rotation speed, a part of the lubricating oil in the main oil supply passage 12 can be discharged to the outside of the rotating shaft 10 via the bypass oil passage 20 by the centrifugal force, and can be returned to the oil sump, whereby the oil circulation rate can be prevented from being excessively high.

In the illustrated example, the bypass oil passage 20 is provided at the center oil passage 12a and is in fluid communication with the center oil passage 12 a. The bypass oil passage 20 is a radial oil passage that extends through the wall of the rotary shaft 10 generally transversely to the center oil passage 12 a. The bypass oil passage 20 may be in the form of a circular hole, or may be in any other suitable form.

The bypass member 30 is mounted to the outer circumferential surface 11 of the rotary shaft 10 at the bypass oil passage 20. Referring to fig. 1 and 4, the bypass member 30 has a substantially annular shape. The bypass member 30 includes a body 32 fixed to the outer circumferential surface 11 of the rotary shaft 10, a slider 34 slidable within the body 32, and a biasing member 36 for applying a biasing force to the slider 34.

The body 32 is substantially annular, and includes an inner peripheral surface 35 abutting against the outer peripheral surface 11 of the rotary shaft 10 and an outer peripheral surface 33 opposite to the inner peripheral surface 35. The body 32 is provided with a channel 37 extending from the outer circumferential surface 33 to the inner circumferential surface 35, and the slider 34 is slidable in the channel 37, and thus, the channel 37 may also be referred to as a slide channel. The body 32 is provided with a discharge passage 31 that allows the lubricating oil to flow out. The discharge passage 31 is located between the inner peripheral surface 35 and the outer peripheral surface 33 and extends downward through the body 32 substantially perpendicular to the passage 37.

When the rotary shaft 10 rotates, the lubricating oil in the center oil passage 12a flows toward the bypass passage 20 by the centrifugal force. When the lubricating oil flowing to the bypass passage 20 overcomes the urging force of the biasing member 36, the slider 34 is pushed toward the outer peripheral surface 33 while the lubricating oil enters the passage 37. When the slider 34 moves across the discharge passage 31, the lubricating oil flows out from the passage 37 via the discharge passage 31.

As described above, the portion of the passage 37 from the inner peripheral surface 35 to the discharge passage 31 may function as a bypass extension oil passage (hereinafter simply referred to as "extension oil passage") of the bypass oil passage 20, that is, an extension oil passage extending from the bypass oil passage 20. Therefore, the structure or shape of the bypass oil passage 20 and/or the extension oil passage may be designed to facilitate the discharge of the lubricating oil in the center oil passage 12 a. For example, the bypass oil passage (radial oil passage) 20 and/or the extension oil passage may be in the form of a step and have a larger cross-sectional area adjacent to the discharge passage 31 and a smaller cross-sectional area adjacent to the center oil passage 12a (main oil supply passage 12).

In the illustrated example, the channel 37 is a through hole through the body 32 and has a circular cross-section for ease of manufacture. However, the channel 37 may be any other suitable form of hole, recess or slot, depending on the application, and is not limited to the through hole shown in the figures.

In the case of the illustrated channel 37, to secure and mount the biasing member 36, a plug 38 is mounted adjacent the outer peripheral surface 33 of the channel 37. The biasing member 36 is located between the plug 38 and the slider 34. The biasing member 36 is a spring in the illustrated example, it being understood that the biasing member 36 may also be any other suitable member and may be positioned in any other suitable location.

The plug 38 and the slider 34 have a shape adapted to the channel 37, in the example illustrated cylindrical. However, it should be understood that the plug 38 and the slider 34 may have any other suitable shape, size, etc. and are not limited to the illustrated example. Further, the plug 38 may be omitted in some examples. For example, the channel 37 may include a stop for securing or mounting the biasing member 36, in which case the plug 38 may be omitted.

Referring to fig. 2 and 4, a hollow portion 39 is also provided on the body 32. The hollow 39 is located in a portion diametrically opposite the passage 37, thereby balancing the weight of the bypass member, in other words, counterbalancing the weight of the passage of the bypass member. The hollow 39 may be of any suitable shape or size, and may be, for example, a through hole, a recess, a groove, or the like.

Fig. 5-8 illustrate a bypass member 50 according to another embodiment of the present disclosure. The bypass member 50 will be described in detail with reference to fig. 5 to 8. The bypass member 50 differs from the bypass member 30 in the structure of the body. Therefore, the difference of the bypass member 50 from the bypass member 30 will be mainly described below, and the description of the same portion of the bypass member 50 as the bypass member 30 will not be repeated.

As shown in fig. 5 to 8, the bypass oil passage 20 is provided at the eccentric oil passage 20 b. The bypass oil passage 20 is positioned in accordance with the direction of the centrifugal force so as to discharge the lubricating oil under the action of the centrifugal force, i.e., on the same eccentric side of the rotary shaft 10 as the eccentric oil passage 20b, in other words, on the opposite side of the central axis (rotation axis) of the rotary shaft 10 with respect to the central axis of the eccentric oil passage 20 b.

The bypass member 50 is in the form of a counterweight. Bypass member 50 includes body 52, channel 57, slide 54, discharge channel 51, biasing member 56, and plug 58. The channel 57, the slider 54, the discharge channel 51, the biasing member 56, and the plug 58 are substantially identical to the channel 37, the slider 34, the discharge channel 31, the biasing member 36, and the plug 38, respectively, shown in fig. 2-4, and thus, will not be described in detail herein.

In the illustrated example, the body 52 is generally annular and includes an inner circumferential surface 55 that abuts the outer circumferential surface 11 of the rotary shaft 10 and an outer circumferential surface 53 opposite the inner circumferential surface 55. The body 52 is in the form of a weight and includes a weight portion 52a and a connecting portion 52 b. The weight portion 52a and the connecting portion 52b form a circular ring-shaped member, and are mounted to the rotary shaft 10 by means of interference fit or fasteners. However, it should be understood that the body 52 may be any other suitable shape and is not limited to the illustrated example. For example, the body 52 may be arcuate or fan-shaped, etc. In the illustrated example, bypass members such as the passages 57, the sliders 34, and the like are arranged in the arrangement portion 52a, however, it is understood that these bypass members may be provided in other portions of the body.

Referring to fig. 8, a flat surface portion (may be referred to as a "first flat surface portion") 59 is provided in a region around the passage 57 of the inner peripheral surface 55 of the body 52. Accordingly, a flat portion (not shown, and may also be referred to as a "second flat portion") that fits with the flat portion 59 may be provided on the outer peripheral surface of the rotary shaft 10, thereby facilitating mounting and fixing of the bypass mechanism 50 to the rotary shaft 10. It should be understood that the portion of the bypass member abutting the outer peripheral surface of the rotary shaft may be a flat surface portion. It will also be appreciated that the planar portions of the bypass member and the rotary shaft may vary in the circumferential direction, for example, on radially opposite sides of the bypass member's track 57 and the rotary shaft's bypass channel, respectively.

Fig. 9 shows one example of application of the oil supply mechanism according to the present disclosure. As shown in fig. 9, the oil supply mechanism according to the present disclosure is used in the scroll compressor 200. The scroll compressor 200 includes a housing 212, a compression mechanism CM provided in the housing 212, and a rotary shaft 10 for driving the compression mechanism CM. At the bottom of the housing 212 is an oil sump OR. As defined above, since the scroll compressor 200 has the rotary shaft 10, it also belongs to the rotary machine described herein. However, it should be understood that the oil supply mechanism according to the present disclosure may be applied to any other suitable type of rotary machine, and is not limited to the vertical scroll compressor shown in fig. 9.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the specific embodiments described and illustrated in detail herein, and that various changes may be made to the exemplary embodiments by those skilled in the art without departing from the scope defined by the appended claims. For example, the slider can directly abut against the outer circumferential surface of the rotating shaft or can be at a distance from the outer circumferential surface of the rotating shaft. In the case where the slider directly abuts against the outer peripheral surface of the rotary shaft, the discharge passage may be defined between the inner peripheral surface of the body and the outer peripheral surface of the rotary shaft. For example, the discharge passage is formed by a gap between the inner circumferential surface of the body and the outer circumferential surface of the rotary shaft, or by a groove provided on the inner circumferential surface of the body. It should also be understood that features of the various embodiments may be combined with each other or may be omitted without departing from the scope of the claims.

Claims

1. An oil supply mechanism of a rotary machine, the rotary machine including a rotary shaft (10), the oil supply mechanism (100) comprising:

a main oil supply passage (12), the main oil supply passage (12) being formed in the rotating shaft (10) substantially in the axial direction of the rotating shaft;

a bypass oil passage (20) provided in the rotating shaft and communicating with the main oil supply passage (12) to allow a portion of the lubricating oil in the main oil supply passage (12) to flow out through the bypass oil passage (20); and

a bypass member (30, 50) that is a separate member and is mounted to an outer peripheral surface (11) of the rotary shaft at the bypass oil passage, the bypass member being configured to enable a portion of the lubricating oil in the main oil supply passage to be discharged via the bypass oil passage by a centrifugal force according to a rotation speed of the rotary shaft.

2. The oil supply mechanism according to claim 1, wherein the oil supply mechanism (100) further comprises an oil pumping device installed at an end of the rotating shaft where the lubricating oil is introduced.

3. The oil supply mechanism according to claim 2, wherein the oil pumping device is a fixed-amount oil pumping device.

4. The oil supply mechanism according to claim 1, wherein the main oil supply passage includes a center oil passage (12a) extending from one end portion of the rotary shaft and an eccentric oil passage (12b) extending eccentrically from the center oil passage toward the other end portion of the rotary shaft, and the bypass oil passage (20) is provided at the center oil passage (12a) or at the eccentric oil passage and on an opposite side of a center axis of the rotary shaft with respect to a center axis of the eccentric oil passage.

5. The oil supply mechanism according to claim 1, wherein the bypass member has a first flat surface portion (59) that abuts against an outer peripheral surface of the rotary shaft, and the outer peripheral surface of the rotary shaft has a second flat surface portion that abuts against the first flat surface portion (59) of the bypass member.

6. The oil supply mechanism according to any one of claims 1 to 5, wherein the bypass component includes a body (32, 52) fixed to an outer peripheral surface of the rotary shaft, a slider (34, 54) slidable in the body, and a biasing member (36, 56) for applying a biasing force to the slider,

the body includes an inner peripheral surface (35, 55) abutting against an outer peripheral surface of the rotary shaft and an outer peripheral surface (33, 53) opposite to the inner peripheral surface,

a discharge passage (31, 51) for allowing the lubricant to flow out is provided in the body.

7. The oil supply mechanism of claim 6 wherein the body has an annular or arcuate shape.

8. The oil supply mechanism of claim 6 wherein the body is in the form of a counterweight.

9. The oil supply mechanism according to claim 6, wherein the bypass oil passage is a radial oil passage extending substantially transversely to the main oil supply passage.

10. The oil supply mechanism according to claim 9, wherein the slider is capable of abutting against an outer peripheral surface of the rotary shaft to close the radial oil passage, and the discharge passage is provided between an inner peripheral surface of the body and the outer peripheral surface of the rotary shaft.

11. The oil supply mechanism according to claim 10, wherein the discharge passage is a groove provided on an inner peripheral surface of the body.

12. The oil supply mechanism according to claim 9, wherein the oil supply mechanism further includes a bypass extension oil passage provided in the bypass member, the bypass extension oil passage being located between and in fluid communication with the radial oil passage and the discharge passage.

13. The oil supply mechanism according to claim 12, wherein the radial oil passage and/or the bypass extension oil passage are in the form of a step having a larger cross-sectional area adjacent to the discharge passage and a smaller cross-sectional area adjacent to the main oil supply passage.

14. The oil supply mechanism according to claim 13, wherein the bypass extension oil passage is configured to allow the slider to slide therein.

15. The oil supply mechanism according to claim 14, wherein the bypass extension oil passage extends through the body and a plug (38, 58) is provided at an outer circumferential surface of the bypass extension oil passage adjacent to the body to secure or mount the biasing member between the plug and the slider.

16. A rotary machine, wherein the rotary machine comprises an oil supply mechanism (100) according to any one of claims 1-15.

17. A rotary machine according to claim 16, wherein said rotary machine includes a scroll compression mechanism, and said rotary shaft is for driving said scroll compression mechanism.