WO2016169348A1

WO2016169348A1 - Scroll compressor and driving shaft for scroll compressor

Info

Publication number: WO2016169348A1
Application number: PCT/CN2016/075985
Authority: WO
Inventors: 赵跟辉
Original assignee: 艾默生环境优化技术(苏州)有限公司
Priority date: 2015-04-24
Filing date: 2016-03-09
Publication date: 2016-10-27

Abstract

A scroll compressor comprises a compressing mechanism (10); a driving shaft (30), the end face of which is provided with an eccentric crank pin (32), wherein the eccentric crank pin (32) matches with one part of the compressing mechanism (10) to drive the compressing mechanism (10); a motor (20), configured to enable the driving shaft (30) to rotate and comprising a stator (122) and a rotor (124); and a main bearing block (140), accommodating a main bearing (144) for supporting the driving shaft (30). The main bearing block (140) is provided with a recessed portion (146) for accommodating the eccentric crank pin (32) and one part of the compressing mechanism (10); at least one oil returning channel (131) for guiding lubricating oil from the recessed portion (146) to the outside of the main bearing block (140) is arranged in the driving shaft (30). A driving shaft, which is used for a scroll compressor and is provided with oil returning channels. The compressor is simple in structure and simplified in assembly, and can effectively recover lubricating oil.

Description

Scroll compressor and drive shaft for scroll compressor

The present application claims priority to Chinese Patent Application No. 201510205545.0 and No. 201520260399.7, the entire contents of which are incorporated herein by reference.

Technical field

The present invention relates to a scroll compressor and a drive shaft for a scroll compressor.

Background technique

The content of this section merely provides background information related to the present disclosure, which may not constitute prior art.

Scroll compressors typically include a compression mechanism, a drive shaft, and a motor. The compression mechanism includes a fixed scroll member and an orbiting scroll member. The orbiting scroll member is orbiting relative to the fixed scroll member under the driving of the drive shaft, such that the blades of the orbiting scroll member and the fixed scroll member are engaged with each other to form a working fluid (for example, a refrigerant) whose volume is gradually reduced. ) A compression chamber that performs compression. The drive shaft is supported by bearings housed within the bearing housing and is rotated by the motor.

Each of the above moving parts requires lubrication of the lubricating oil to maintain the operational stability and reliability of the compressor. Therefore, the lubricating oil circulation system of the compressor is an important part of the compressor. The lubricating oil circulation system of the compressor includes an oil supply portion and a return oil portion. It is desirable that the lubricating oil circulation system of the compressor can not only properly supply the lubricating oil to the respective moving parts but also recover the lubricating oil in an appropriate amount into the oil storage tank.

Therefore, there is a need for a compressor having a lubricating oil recovery system that is simple in construction, simple in assembly, and capable of efficiently recovering lubricating oil.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll compressor having a lubricating oil recovery system which is simple in structure, simplified in assembly, and capable of efficiently recovering lubricating oil.

It is an object of the present invention to provide a scroll compressor that is less expensive.

Another object according to the invention is to provide an effective return for a scroll compressor The drive shaft that receives the lubricant.

According to an aspect of the invention, a scroll compressor is provided, comprising: a compression mechanism; a drive shaft, the drive shaft including an eccentric crank pin on an end surface thereof, the eccentric crank pin cooperating with a portion of the compression mechanism to drive the compression mechanism; a motor configured to rotate the drive shaft and including a stator and a rotor; and a main bearing housing in which a main bearing for supporting the drive shaft is housed, the main bearing housing having a eccentric crank pin and a compression mechanism a portion of the recess, wherein the drive shaft is provided with at least one oil return passage for guiding the lubricating oil from the recess to the outside of the main bearing housing.

According to the above configuration, since the oil return passage for guiding the lubricating oil in the recess of the main bearing housing to the bottom of the compressor is provided in the drive shaft, it is not necessary to provide a radial hole in the main bearing housing and it is not necessary to be in the compressor housing. Components such as oil guiding pipes and shrouds are arranged around. Thus, the above structure not only provides an effective oil return passage, but also reduces the number of components of the compressor and simplifies the structure of the compressor. In addition, manufacturing, installation, and maintenance costs associated with components such as oil guides, shrouds, and the like can be reduced, thereby reducing the cost of the entire compressor.

Optionally, the oil return passage includes an axial oil return hole extending from an axial end of the drive shaft from a portion other than the eccentric crank pin of the end surface of the drive shaft and extending outward in the radial direction from the axial oil return hole Radial oil return hole to the outer cylindrical surface of the drive shaft.

Optionally, the oil return passage includes an oblique oil return hole extending from a portion of the end face of the drive shaft other than the eccentric crank pin to the outer cylindrical surface of the drive shaft.

Preferably, the axial direction of the drive shaft is provided with a radial oil return hole on the upper or lower side of the motor. When a radial oil return hole is provided on the upper side of the motor, it facilitates the machining of the radial oil return hole and can further cool the motor. When a radial oil return hole is provided on the lower side of the motor, the effect of the gas flow on the lubricating oil can be minimized.

In addition, an oil supply passage is further disposed in the drive shaft, and the oil supply passage includes a concentric hole disposed in an end portion of the drive shaft opposite to the compression mechanism and an eccentric hole extending from the concentric hole to an end surface of the eccentric crank pin.

Preferably, a first radial hole extending outward in the radial direction from the eccentric hole is further provided at a position of the drive shaft corresponding to the main bearing. Such a structure facilitates lubrication of the main bearing to extend the life of the main bearing.

Preferably, the scroll compressor further includes an auxiliary bearing seat disposed opposite the main bearing housing and configured to support the other end of the driving shaft, wherein the auxiliary bearing housing is provided with an auxiliary bearing and the driving shaft A second radial hole extending outward in the radial direction from the concentric hole is also provided at a position corresponding to the auxiliary bearing. Such a structure facilitates lubrication of the auxiliary bearing to extend the life of the auxiliary bearing.

Preferably, the radial oil return hole is an elongated hole extending in the circumferential direction or a horn shaped hole.

Preferably, the axial oil return hole is a blind hole.

Optionally, a first weight is disposed on an end of the rotor adjacent to the main bearing housing, and an outlet of the oil return passage is disposed above the first weight; and/or between the main bearing housing and the first weight A second weight is fixed to the drive shaft, and an outlet of the oil return passage is disposed below the second weight.

Preferably, a cylindrical shroud is provided on the bottom surface of the main bearing housing. Due to the provision of the shroud, the lubricating oil can be blocked and the lubricating oil can flow down the shroud.

According to another aspect of the present invention, a drive shaft for a scroll compressor, wherein the drive shaft includes an eccentric crank pin disposed at one end thereof, and an oil supply passage and an oil return passage are provided therein. The oil supply passage includes a concentric hole provided in an end of the drive shaft opposite to a compression mechanism of the scroll compressor, and an eccentric hole extending from the concentric hole to an end surface of the eccentric crank pin. The oil return passage includes an axial oil return hole extending from an axial end of the drive shaft from a portion other than the eccentric crank pin of the end surface of the drive shaft and extending outward in the radial direction from the axial oil return hole to the drive shaft Radial oil return hole of the outer cylindrical surface.

DRAWINGS

The features and advantages of one or more embodiments of the present invention will become more <RTIgt;

Figure 1 is a longitudinal sectional view of a scroll compressor;

Figure 2 is an enlarged schematic view of a portion indicated by a broken line V in Figure 1;

Figure 3 is a schematic cross-sectional view taken along line M-M of Figure 1;

Figure 4 is a longitudinal sectional view of a drive shaft according to a first embodiment of the present invention;

Figure 5 is a longitudinal sectional view of a drive shaft according to a second embodiment of the present invention.

detailed description

The following description of the preferred embodiments is merely exemplary and is in no way limiting The same reference numerals are used in the respective drawings to refer to the same components, and thus the construction of the same components will not be repeatedly described.

The overall configuration and operating principle of the scroll compressor will first be described with reference to FIG. It should be understood that the compressor of Figure 1 is for illustrative purposes only and is not limiting of the invention.

As shown in FIG. 1, a scroll compressor 100 (hereinafter sometimes referred to as a compressor) generally includes a housing 110, a top cover 112 disposed at one end of the housing 110, and a bottom cover 114 disposed at the other end of the housing 110. . A compression mechanism 10, a drive shaft 30, and a motor 20 are disposed in the housing 110. The compression mechanism 10 includes a fixed scroll member 150 and an orbiting scroll member 160. The motor 20 is configured to rotate the drive shaft 30, and then the rotation of the drive shaft 30 causes the orbiting scroll member 160 to orbit relative to the fixed scroll member 150 (ie, the central axis of the orbiting scroll member 160 wraps around the scroll member 150) The central axis rotates, but the orbiting scroll member 160 itself does not rotate about its central axis, thereby effecting compression of the fluid.

The movable scroll member 160 includes an end plate 164, a hub portion 162 formed on one side of the end plate, and a spiral blade 166 formed on the other side of the end plate. The fixed scroll member 150 includes an end plate 154, a spiral blade 156 formed on one side of the end plate, and an exhaust port 152 formed at a substantially central position of the end plate. A series of compression chambers whose volume gradually decreases from the radially outer side to the radially inner side are formed between the spiral vanes 156 of the fixed scroll member 150 and the spiral vanes 166 of the orbiting scroll member 160. Wherein, the radially outermost compression chamber is at the suction pressure, and the radially innermost compression chamber is at the exhaust pressure. The intermediate compression chamber is between the suction pressure and the discharge pressure, and is also referred to as the medium pressure chamber.

One side of the movable scroll member 160 is supported by an upper portion of the main bearing housing 140 which constitutes a thrust surface. One end of the drive shaft 30 is supported by a main bearing 144 disposed in the main bearing housing 140, and the other end is supported by an auxiliary bearing or a lower bearing 174 disposed in the auxiliary bearing housing or the lower bearing housing 170. An end of the drive shaft 30 adjacent to the orbiting scroll member 160 is provided with an eccentric crank pin 32, and an unloading bushing 42 is disposed between the eccentric crank pin 32 and the hub portion 162 of the orbiting scroll member 160. The eccentric crank pin 32 can be received in a generally D-shaped bore of the unloading bushing 42. The radial flexibility of the compression mechanism can be achieved by means of the eccentric crank pin 32 and the unloading bushing 42.

The motor 20 is composed of a stator 122 and a rotor 124. The stator 122 is typically fixedly mounted to the housing 110. The rotor 124 is fixedly mounted to the drive shaft 30. Thus, as the rotor 124 rotates, the rotor 124 drives the drive shaft 30 to rotate, which in turn drives the orbiting scroll member 160 to move in translation (i.e., orbiting motion).

In the example of the scroll compressor shown in Fig. 1, lubricating oil may be stored at the bottom of the compressor housing. Accordingly, a passage extending substantially in the axial direction thereof is formed in the drive shaft 30, that is, a center hole 136 formed at the lower end of the drive shaft 30 and an eccentric hole 134 extending upward from the center hole 136 to the end surface of the eccentric crank pin 32. The end of the central bore 136 may be submerged in the lubricating oil at the bottom of the compressor housing or otherwise supplied with lubricating oil. In one example, a lube supply device, such as an oil pump or oil fork, or the like, may be provided in the central bore 136 or at its end. During the operation of the compressor, one end of the center hole 136 is supplied with lubricating oil by the lubricating oil supply device, and the lubricating oil entering the center hole 136 is pumped or pulled to the eccentric hole by the centrifugal force during the rotation of the drive shaft 30. The 134 and the upward flow along the eccentric hole 134 continue until reaching the end surface of the eccentric crank pin 32. The lubricating oil discharged from the end surface of the eccentric crank pin 32 flows downward along the gap between the unloading bush 42 and the eccentric crank pin 32 and the gap between the unloading bush 42 and the hub 162 to reach the recess 146 of the main bearing housing 140. in. Additionally, a radial bore 132 in fluid communication with the eccentric bore 134 may be provided at a location of the drive shaft 30 corresponding to the main bearing 144 to provide lubricating oil to the main bearing 144. Likewise, a radial bore 138 in fluid communication with the central bore 136 can be provided at a location of the drive shaft 30 corresponding to the lower or secondary bearing 174 to provide lubricating oil to the down bearing 174. In this example, the central bore 136, the eccentric bore 134, and the radial bores 132 and 138 constitute an oil supply passage for the drive shaft 30.

In some conventional or existing compressors, in order to return the lubricating oil to the sump of the bottom of the compressor after lubricating the various moving parts, in particular, to lubricate the lubricating oil after the eccentric crank pin and the unloading bushing from the main bearing The central recess of the seat is returned to the oil reservoir, and a hole extending radially from the central recess through the main bearing housing is provided in the main bearing housing, so that the lubricating oil can flow down the compressor housing to the bottom of the compressor. In the oil tank. However, in this configuration, the lubricating oil flowing down the casing is often affected by the air flow, and sometimes even by the air flow out of the compressor, thereby causing an insufficient amount of lubricating oil stored in the oil storage tank. In other conventional or existing compressors, in order to prevent the influence of the airflow on the lubricating oil, an oil guiding groove or an oil guiding pipe is disposed at a corresponding portion of the casing to separate the lubricating oil flowing down the casing from the airflow, that is, The lubricating oil is not affected by the air flow. However, in this configuration, it is necessary to fix the oil guide groove, the shroud or the oil guiding pipe to the casing of the compressor or other parts of the compressor by welding or interference fit, thereby increasing the assembly load and reducing the assembly. effectiveness. In addition, welding or interference fit may also cause undesirable deformation of the housing or other parts of the compressor. It is also possible to additionally generate costs or costs associated with the manufacture, assembly or maintenance of the oil guide, shroud or oil conduit.

In order to solve the above problems, the inventors of the present application have conceived that an oil return passage is provided in the drive shaft 30 to guide the lubricating oil in the recess 146 of the main bearing housing 144 toward the oil reservoir, instead of providing a radial hole in the main bearing housing. To direct the lubricating oil to the housing of the compressor. Therefore, in the present invention In the configuration, it is not necessary to provide an oil guiding groove, a shroud or an oil guiding pipe near the casing, so that many problems caused by the oil guiding groove, the shroud or the oil guiding pipe can be overcome.

The oil return passage of the drive shaft, in particular the drive shaft, according to the present invention will now be described in detail with reference to the accompanying drawings. Referring to Fig. 2, the drive shaft 30 further includes an axial oil return hole 135 extending downward from the axial direction of the drive shaft 30 from a portion other than the eccentric crank pin 32 on the end surface of the drive shaft 30, and an oil return hole from the axial direction. 135 A radial oil return hole 137 extending radially outward. The axial oil return hole 135 is in fluid communication with the recess 146 of the main bearing housing 140. In the illustrated embodiment, the axial oil return hole 135 and the radial oil return hole 137 constitute the oil return passage 131 of the drive shaft 30.

With the drive shaft 30 according to the present invention, the lubricating oil flows to the end faces of the eccentric crank pins 32 via the oil supply passages of the drive shaft 30 (specifically, the center hole 136 and the eccentric hole 134), the eccentric crank pin 32, the unloading bushing 42 The hub portion 162 of the orbiting scroll member is lubricated and then collected in the recess 146 of the main bearing housing 140. At least a majority of the lubricating oil collected in the recess 146 of the main bearing housing 140 may flow downward through the axial oil return hole 135 of the drive shaft 30 and out of the drive shaft 30 via the radial oil return hole 137.

It should be understood that the position at which the radial oil return holes 137 are disposed may vary. As shown in FIGS. 4 and 2, the radial oil return hole 137 may be disposed substantially above the motor 20. Thus, in conjunction with FIG. 3, the lubricating oil that is drawn and splashed from the radial oil return hole 137 to form a droplet or mist can pass through, for example, the gap 123 between the stator windings 126 of the motor 20 and the stator 122 and the housing 110. The gap 125 between them flows down into the sump at the bottom of the compressor. In the illustrated embodiment, the lubricating oil facilitates further reducing the temperature of the motor 20, thereby increasing the efficiency of the motor 20.

Further, in the case where a weight is provided on the end surface of the rotor 124 of the motor 20, the radial oil return hole 137 may be disposed substantially above the weight. Similarly, lubricating oil that is drawn and splashed from the radial oil return hole 137 to form droplets or mist can flow down through the respective gaps in the motor (motor) to the oil reservoir at the bottom of the compressor.

A weight can also be provided on the drive shaft 30, which can be adjacent to the main bearing housing 140. In this case, the radial oil return hole 137 may be located between the balance weight on the drive shaft 30 and the balance weight on the rotor 124, that is, below the balance weight on the drive shaft 30 and on the rotor 124. Above the block.

As shown in FIGS. 1 and 2, a cylindrical flow guide cover 120 may be provided on the bottom surface of the main bearing housing 140. Since the shroud 120 is provided, the lubricating oil can be blocked and the lubricating oil flows downward along the shroud 120. Preferably, the shroud 120 can be disposed above the motor windings.

As shown in FIG. 5, the radial oil return hole 137 may also be disposed substantially below the motor 20. In the In the illustrated construction, the lubricating oil flows directly back below the motor 20, i.e., closer to the sump, thus further reducing the effect of the gas flow on the lubricating oil.

It is to be understood that the specific examples illustrated are merely illustrative of the invention and are not intended to limit the invention. For example, the oil return passage 138 of the drive shaft 30 may be an oblique oil return hole directly extending from a portion other than the eccentric crank pin on the end surface of the drive shaft 30 through the side wall of the drive shaft 30, instead of the above embodiment. The axial oil return hole 135 and the radial oil return hole 137 are formed. Further, the radial oil return hole 137 may be an elongated hole that communicates with the axial oil return hole 135 and extends in the circumferential direction or may be flared to facilitate uniform distribution of the lubricating oil to the gap 123 between the stator windings 126 and / or a gap 125 between the stator 122 and the housing 110 to better cool the motor 20. Similarly, the size and shape of the radial oil return hole 137 can also be changed according to actual needs. Although the radial oil return hole 137 is shown as being located above the motor 20 in FIG. 4 and below the motor 20 in FIG. 5, it is conceivable that both the upper and lower portions of the motor 20 may be disposed. Radial oil return hole 137. In the illustrated example, the axial oil return hole 135 is a blind hole, however, it should be understood that the axial oil return hole 135 may be other forms of holes, such as stepped holes, eccentric holes, inclined holes or through holes, and the like. In addition, the extending direction of the axial oil return hole 135 may not be completely parallel to the axial direction of the drive shaft 30, but may be at an angle with respect to the axial direction of the drive shaft 30.

Various embodiments and variations of the present invention have been described in detail above, but those skilled in the art should understand that the invention is not limited to the specific embodiments and variations described above, but may include various other possible combinations and combinations.

Although the various embodiments of the present invention have been described in detail herein, it is understood that the invention The skilled person implements other variations and variants. All such variations and modifications are intended to fall within the scope of the invention. Moreover, all of the components described herein can be replaced by other technically equivalent components.

Claims

A scroll compressor (100) comprising:

Compression mechanism (10);

a drive shaft (30) including an eccentric crank pin (32) on an end face thereof, the eccentric crank pin (32) cooperating with a portion of the compression mechanism (10) to drive the compression mechanism (10);

a motor (20) configured to rotate the drive shaft (30) and including a stator (122) and a rotor (124);

a main bearing housing (140) in which a main bearing (144) for supporting the drive shaft (30) is accommodated, the main bearing housing (140) having a housing for housing An eccentric crank pin (32) and a recess (146) of the portion of the compression mechanism (10),

Wherein, the drive shaft (30) is provided with at least one oil return passage (131) for guiding lubricating oil from the recess (146) to the outside of the main bearing housing (140).
The scroll compressor (100) according to claim 1, wherein said oil return passage (131) includes, in addition to said eccentric crank pin (32) from said end surface of said drive shaft (30) a portion of the axial oil return hole (135) extending substantially in the axial direction of the drive shaft (30) and extending outward from the axial oil return hole (135) in the radial direction to the drive shaft (30) The radial oil return hole (137) of the outer cylindrical surface.
The scroll compressor (100) according to claim 1, wherein said oil return passage (131) includes, in addition to said eccentric crank pin (32) from said end surface of said drive shaft (30) The portion extends to the oblique oil return hole of the outer cylindrical surface of the drive shaft (30).
The scroll compressor (100) according to claim 2, wherein said radial return is provided on an upper side or a lower side of said motor (20) in said axial direction of said drive shaft (30) Oil hole (137).
The scroll compressor (100) according to any one of claims 1 to 4, wherein an oil supply passage is further provided in the drive shaft (30), and the oil supply passage includes a drive shaft disposed at the drive shaft Concentric holes (136) in the end of (30) opposite the compression mechanism (10) and from the The concentric bore (136) extends to an eccentric bore (134) of the end face of the eccentric crank pin (32).
The scroll compressor (100) according to claim 5, wherein a position along the eccentric hole (134) is further provided at a position of the drive shaft (30) corresponding to the main bearing (144) A first radial bore (132) extending radially outward.
The scroll compressor (100) according to claim 5, wherein said scroll compressor (100) further comprises a plurality of said main bearing housings (140) disposed opposite said main bearing housing (140) for supporting said drive shaft (30) An auxiliary bearing housing (170), in which an auxiliary bearing (174) is disposed, and

A second radial bore (138) extending outwardly from the concentric bore (136) in a radial direction is also provided at a location of the drive shaft (30) corresponding to the auxiliary bearing (174).
The scroll compressor (100) according to claim 2 or 4, wherein the radial oil return hole (137) is an elongated hole extending in the circumferential direction or a flared hole.
The scroll compressor (100) according to claim 2 or 4, wherein the axial oil return hole (135) is a blind hole.
The scroll compressor (100) according to any one of claims 1 to 4, wherein a first balancer is disposed on an end of the rotor (124) adjacent to the main bearing housing (140) The outlet of the oil return passage (131) is disposed above the first balance weight; and/or

A second balancer fixed to the drive shaft (30) is further disposed between the main bearing seat (140) and the first balance block, and an outlet of the oil return passage (131) is disposed at the Below the second balance block.
The scroll compressor (100) according to any one of claims 1 to 4, wherein a cylindrical flow guide (120) is provided on a bottom surface of the main bearing housing (140).
A drive shaft (30) for a scroll compressor (100), wherein the drive shaft (30) includes an eccentric crank pin (32) disposed at one end thereof, and an oil supply passage is disposed therein And oil return passage (131),

The oil supply passage includes a concentric hole (136) disposed in an end of the drive shaft (30) opposite to the compression mechanism (10) of the scroll compressor (100) and from the concentric hole ( 136) an eccentric hole (134) extending to an end surface of the eccentric crank pin (32), and

The oil return passage (131) includes an axial return from a portion of the end surface of the drive shaft (30) except the eccentric crank pin (32) extending substantially in the axial direction of the drive shaft (30) An oil hole (135) and a radial oil return hole (137) extending outward from the axial oil return hole (135) in a radial direction to an outer cylindrical surface of the drive shaft (30).