WO2015064611A1

WO2015064611A1 - Scroll-type fluid machine

Info

Publication number: WO2015064611A1
Application number: PCT/JP2014/078709
Authority: WO
Inventors: 史雄赤岩
Original assignee: サンデン株式会社
Priority date: 2013-10-30
Filing date: 2014-10-29
Publication date: 2015-05-07
Also published as: CN105683577A; JP2015086764A; JP6258665B2; CN105683577B

Abstract

[Problem] To resolve the problem of insufficient supply of lubricating oil to each bearing part, shaft seal part, and sliding part in a scroll-type fluid machine, and to increase the efficiency and durability of the scroll-type fluid machine. [Solution] A housing space (9) that houses a drive mechanism (8) of a moveable scroll member (3) is formed inside a front housing (5). A recessed part (40) that is for storing lubricating oil is formed in a housing member (9) peripheral surface that surrounds the drive mechanism (8), and a guide (40a) that guides lubricating oil in the direction of the center of the drive mechanism (8) is provided to the recessed part (40). A lubricating-oil supply passageway (52) is formed in the front housing (5) and a center housing (6) and communicates between the recessed part (40) and an oil storage chamber (51) that, on the side of a discharge chamber (20) into which a compressed fluid is introduced, stores lubricating oil that is separated by an oil separator, and lubricating oil is supplied from a high pressure region on the discharge chamber (20) side to a low pressure region on a housing space (9) side.

Description

Scroll type fluid machinery

The present invention relates to a scroll type fluid machine that includes a fixed scroll member and a movable scroll member, and compresses or expands a fluid by changing the volume of a sealed space formed by these members.

As a scroll type fluid machine, a scroll type compressor as shown in Patent Document 1 is well known. This includes a fixed scroll member and a movable scroll member that revolves in contact with the fixed scroll member and forms a sealed space in which the volume changes according to the revolution between the fixed scroll member. Further, in this compressor, a housing space portion that houses the drive mechanism of the movable scroll member is formed inside the first housing (front housing), and the drive shaft of the drive mechanism is pivoted on one end side of this housing space portion. A supporting bearing portion is provided, a thrust receiving portion for receiving the thrust force of the movable scroll member is formed on the other end side of the accommodating space portion, and is joined to the outer peripheral end surface of the first housing (front housing) on the thrust receiving portion side. A compression mechanism including a fixed scroll member and a movable scroll member is accommodated in the second housing (center housing).

By the way, in this compressor, the lubricating oil is supplied into the first housing (front housing) for the purpose of lubrication and cooling of the bearing portion and each sliding portion of the drive mechanism. In the compressor described in Patent Document 1, fluid (refrigerant) is contained in a discharge chamber formed in a third housing (rear housing) on the back side of the fixed scroll member and into which compressed fluid is introduced by an oil separator. An oil storage chamber for storing the lubricating oil separated from the oil is provided, and the lubricating oil in the oil storage chamber is supplied into the first housing (front housing).

Japanese Patent Laid-Open No. 11-93880

However, in the compressor described in Patent Document 1, the first housing (front housing) side opening end of the lubricating oil supply passage for supplying the lubricating oil from the oil storage chamber to the first housing (front housing). Is provided in a fluid (refrigerant) suction chamber. For this reason, the lubricating oil supplied to the suction chamber from the lubricating oil supply passage is sucked again into the compression mechanism on the second housing (center housing) side together with the sucked refrigerant, and the inside of the first housing (front housing) There is a possibility that the lubricating oil may not be sufficiently supplied to the sliding portion between the bearing portion, the shaft seal portion, the thrust receiving portion, and the movable scroll.

The present invention has been made paying attention to the above problems, and the lubricating oil supplied to the first housing side is not sucked into the second housing side, and the bearing portion and the shaft seal portion in the first housing are provided. Another object of the present invention is to provide a scroll type fluid machine that can be sufficiently supplied to a sliding portion between a thrust receiving portion and a movable scroll.

For this reason, the scroll type fluid machine of the present invention revolves in the first housing so as to revolve while contacting the fixed scroll member and to form a sealed space whose volume changes with the revolving between the fixed scroll member and the fixed scroll member. An accommodation space portion for accommodating the drive mechanism of the scroll member is formed, a bearing portion for supporting the drive shaft of the drive mechanism is provided on one end side of the accommodation space portion, and the movable scroll is provided on the other end side of the accommodation space portion. A thrust receiving portion for receiving a thrust force of the member is formed, and the fixed scroll member and the movable scroll member are accommodated in a second housing joined to an outer peripheral end surface of the first housing on the thrust receiving portion side. In the scroll type fluid machine configured as described above, a recess for storing lubricating oil is formed on a peripheral surface around the drive mechanism of the accommodating space, and the recess To characterized in that a guide portion for guiding the lubricating oil portion to the center of the drive mechanism.

According to the scroll type fluid machine of the present invention, the lubricating oil can be stored in the concave portion formed in the accommodating space portion in the first housing that accommodates the drive mechanism of the movable scroll, and further, by the guide portion in the concave portion. Since the lubricating oil can be guided toward the drive mechanism of the movable scroll, the lubricating oil is sufficiently supplied to the bearing portion in the first housing, the shaft seal portion, and the sliding portion of each thrust receiving portion and the movable scroll. Will be able to. Accordingly, the wear of the sliding portion between the bearing portion, the shaft seal portion and the thrust receiving portion and the movable scroll can be suppressed, the durability of the fluid machine can be improved, and the efficiency of the fluid machine can be reduced due to heat generation of the sliding portion. Can be prevented.

The front view of the scroll compressor which shows 1st Embodiment of this invention. AA arrow cross-sectional view of FIG. BB cross-sectional view of FIG. Sectional view with the movable scroll member of FIG. 3 removed Sectional view with the thrust plate of FIG. 4 removed CC sectional view of FIG. Sectional drawing of the scroll compressor which shows 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail. The scroll type fluid machine according to the present invention can be used as a compressor or an expander. Here, an example of a compressor will be described.

First, a first embodiment of the present invention will be described with reference to FIGS.
1 to 6 show the overall configuration of the scroll compressor according to the first embodiment. FIG. 1 is a front view, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line BB, FIG. 4 is a cross-sectional view taken away from the movable scroll of FIG. 3, FIG. 5 is a cross-sectional view taken away from the thrust plate of FIG. It is.

The scroll compressor 1 includes a fixed scroll member 2 and a movable scroll member 3 that are arranged to face each other in the central axis direction. The fixed scroll member 2 is formed by integrally forming a spiral wrap 2b on an end plate 2a. Similarly, the movable scroll member 3 is formed by integrally forming a spiral wrap 3b on an end plate 3a.

Both scroll

members

2 and 3 mesh both

spiral wraps

2b and 3b, the edge of the spiral wrap 2b on the protruding side contacts the end plate 3a, and the edge of the spiral wrap 3b on the protruding side contacts the end plate 2a. Is arranged. A tip seal is embedded in the end edge of the

spiral wraps

2b and 3b on the protruding side.

The

scroll members

2 and 3 are arranged such that the side walls of the

spiral wraps

2b and 3b are partially in contact with each other with the circumferential angles of the

spiral wraps

2b and 3b shifted from each other. Thereby, the fluid pocket 4 which is a crescent-shaped sealed space is formed between the

spiral wraps

2b and 3b.

The movable scroll member 3 is revolved around the central axis of the fixed scroll member 2 by a drive mechanism 8 and a rotation prevention mechanism 33, which will be described later, and rotation is prevented. As a result, the volume of the fluid pocket 4 changes in the shrinking direction by moving the fluid pocket 4 formed between the

spiral wraps

2b and 3b from the outer ends of the

spiral wraps

2b and 3b toward the center. . Therefore, the fluid (for example, refrigerant gas) taken into the fluid pocket 4 from the outer end side of the

spiral wraps

2b and 3b is compressed.

In the case of an expander, the volume of the fluid pocket 4 changes in the increasing direction by moving the fluid pocket 4 from the center of the

spiral wraps

2b and 3b toward the outer end. The fluid taken into the fluid pocket 4 from the center side of 2b and 3b is expanded.

The housing of the scroll compressor 1 includes a front housing (first housing) 5, a center housing (second housing) 6 that integrally includes the fixed scroll member 2, and a rear housing disposed on the back side thereof. (Third housing) 7.

The front housing 5 is formed therein with a housing space 9 for housing the drive mechanism 8 of the movable scroll member 3, and a bearing 10 that supports the drive shaft of the drive mechanism 8 at one end of the housing space 9. A shaft seal portion 11 is provided. A thrust receiving portion 13 that supports the movable scroll member 3 in the thrust direction via an annular thrust plate 12 is formed on the other end side of the housing space portion 9. In the front housing 5, the fluid suction chamber 14 is formed above the accommodation space portion 9, and the fluid is sucked into the suction chamber 14 from the outside via a suction port 15 provided on the outer wall of the front housing 5. Is done.

In this embodiment, the center housing 6 is formed integrally with the fixed scroll member 2 as a casing (outer shell) of the fixed scroll member 2. However, the fixed scroll member 2 and the center housing 6 may be separate members, and the fixed scroll member 2 may be accommodated and fixed in the center housing 6. The center housing 6 is closed on the rear side by the end plate 2b of the fixed scroll member 2, and the front side is open. The front side to be opened is joined to the end face of the outer periphery of the front housing 5 on the thrust receiving portion 13 side and fastened by bolts 16.

In the front housing 5 and the center housing 6, a bulging portion 17 is formed in a part of the circumferential direction. Inside the bulging portion 17, extending in a direction parallel to the central axis of the compressor, from the suction chamber 14 on the front housing 5 side to the vicinity of the outer ends of the

spiral wraps

2 b and 3 b on the center housing 6 side, A fluid passage space 18 for guiding the fluid is formed.

The rear housing 7 is fastened by a bolt 19 to the back side of the end plate 2b of the fixed scroll member 2, and forms the fluid discharge chamber 20 between the rear housing 7 and the end plate 2b. A discharge hole 21 for introducing the fluid in the fluid pocket 4 compressed by the revolving motion of the movable scroll member 3 into the discharge chamber 20 is opened at the center of the end plate 2b. A directional valve 22 is attached. In addition, a discharge port 23 for the fluid from the discharge chamber 20 to the outside is provided on the outer wall of the rear housing 7.

The fluid is introduced into a suction chamber 14 in the front housing 5 from a suction port 15 provided in the front housing 5, and passes through a fluid passage space 18 inside the bulging portion 17 of the front housing 5 and the center housing 6. It is taken into the aforementioned fluid pocket 4 from the outer end side of the spiral wraps 2b and 3b and subjected to compression. The compressed fluid is discharged from the discharge hole 21 formed in the central portion of the end plate 2 a of the fixed scroll member 2 to the discharge chamber 20 in the rear housing 7, and is led out to the outside through the discharge port 23 from there. Is done.

The drive mechanism 8 housed in the housing space 9 of the front housing 5 is provided on a drive shaft that is rotationally driven by a rotational drive force input from the outside, as described in, for example, Japanese Patent Application Laid-Open No. 2012-237288. A crank mechanism is provided and connected to the movable scroll member 3 via the crank mechanism.

In the drive mechanism 8, a drive shaft 24 is rotatably supported by a bearing 10 on one end side of the accommodating space 9. One end of the drive shaft 24 protrudes outside the front housing 5, and a pulley 26 is attached to the drive shaft 24 via an electromagnetic clutch 25. Accordingly, the drive shaft 24 is rotationally driven by the rotational driving force input from the pulley 26 via the electromagnetic clutch 25. The crank mechanism provided on the other end side of the drive shaft 24 includes a crank 28 pivotally supported on the inner peripheral wall of the accommodating space 9 via a bearing 27, and the crank 28 is eccentric with respect to the central axis of the drive shaft 24. The eccentric bush 29 is fitted to the inside of a cylindrical boss 30 projecting from the back surface of the end plate 3b of the movable scroll member 3 via a bearing 31. is doing. A balancer weight 32 is attached to the crank mechanism. In FIGS. 2 and 6, the drive shaft 24 to the eccentric bush 29 are integrally illustrated as the drive mechanism 8 for simplification of the drawings.

Therefore, the movable scroll member 3 turns through the crank mechanism by the rotation of the drive shaft 24, the movable scroll member 3 is prevented from rotating by a rotation prevention mechanism 33 described later, and the movable scroll member 3 is connected to the fixed scroll member 2. Revolves around the central axis.

In this embodiment, the rotation preventing mechanism 33 of the movable scroll member 3 includes a plurality of round holes 34 (four in this embodiment) formed near the outer peripheral portion of the back surface of the end plate 3a of the movable scroll member 3, and each round The disc member 35 is inserted into the hole 34 with a slight gap and has an eccentric hole at a position shifted from the center position, and the thrust receiving portion 13 of the front housing 5 is provided with the same number of protrusions as the round hole 34. The movable scroll member 3 includes a pin 36 (four in this embodiment) that penetrates the thrust plate 12, and a small gap is provided in the eccentric hole of each disk member 35 to fit each pin 36. Regulating the rotation of

Here, a plurality (four in this embodiment) of recesses 40 for storing lubricating oil are formed on the peripheral surface around the drive mechanism 8 of the accommodation space 9 of the front housing 5. These concave portions 40 are formed from the thrust receiving portion 13 toward the bearing 27 along the central axis of the drive mechanism 8 with the pin 36 attachment region in the thrust receiving portion 13 interposed therebetween. Further, the outer diameter of the recess 40 in the radial direction of the accommodating space 9 is formed smaller than the outer diameter of the thrust plate 12. Therefore, the accommodating space 9 is partitioned from the suction chamber 14 side and the fluid passage space 18 side by the thrust plate 12 and the end plate 3 b of the movable scroll member 3. Further, the side portions of each recess 40 facing each other are formed toward the center direction of the drive mechanism 8, and a guide portion 40 a that guides the lubricating oil stored in the recess 40 toward the center direction of the drive mechanism 8. It has become.

Although not shown, the rear housing 7 incorporates an oil separator, and an oil storage chamber 51 for storing lubricating oil separated from the fluid by the oil separator is formed in the lower portion of the rear housing 7.

In the oil storage chamber 51 of the rear housing 7, one end of a lubricating oil supply passage 52 formed in the center housing 6 and the front housing 5 is opened as shown in FIG. The lubricating oil supply passage 52 is formed in a thick rib portion formed in a part of the center housing 6 and the front housing 5, and opens into one of the four recessed portions 40 formed in the accommodation space portion 9. Yes. The opening 53 on the recess 40 side of the lubricating oil supply passage 52 is opened at the end of the recess 40 on the bearing 27 side.

In the scroll compressor 1 having such a configuration, when the pulley 26 is rotated by an external rotational driving force, the drive shaft 24 is rotated via the electromagnetic clutch 25, and the movable scroll member 3 is moved by the crank mechanism to the fixed scroll member 2. Revolves around the central axis. By the revolving motion of the movable scroll member 3, fluid (refrigerant gas) is taken into the fluid pocket 4 from the outer end side of the spiral wraps 2 b and 3 b from the suction port 15 through the suction chamber 14 and the fluid passage space 18. The fluid compressed by the change in the volume of the fluid pocket 4 is discharged from the discharge hole 21 at the center of the fixed scroll member 2 to the discharge chamber 20. The fluid discharged into the discharge chamber 20 is separated from the lubricating oil mixed in the fluid by the oil separator, and the refrigerant gas from which the lubricating oil has been separated is led out through the discharge port 23.

On the other hand, the lubricating oil separated by the oil separator is stored in the oil storage chamber 51 below the rear housing 7. Lubricating oil in the oil storage chamber 51 is accommodated from the oil storage chamber 51 through the lubricating oil supply passage 52 due to a pressure difference between the interior of the rear housing 7 which is a high pressure region and the accommodation space 9 of the front housing 5 which is a low pressure region. It is supplied to the space 9 side and supplied to the recess 40 from the bearing 27 side opposite to the thrust receiving portion 13 side. The lubricating oil supplied to the recess 40 is guided toward the center of the drive mechanism 8 by the side wall portion of the recess 40, that is, the guide portion 40a, and the

bearings

27 and 31 of the drive mechanism 8, the shaft seal portion 11 and the like. It is supplied to the sliding surface between the end plate 3 a of the movable scroll member 3 and the thrust plate 12.

According to the scroll compressor 1 of the present embodiment, the lubricating oil is supplied to the side of the accommodating space 9 separated from the suction side space through which the fluid is sucked by the end plate 3a of the movable scroll member 3 and the thrust plate 12. Therefore, it is possible to prevent the lubricating oil from being led out to the suction side space as it is, and the sliding between the

bearings

27 and 31 of the drive mechanism 8, the shaft seal portion 11 and the end plate 3 a of the movable scroll member 3 and the thrust plate 12. Sufficient lubricating oil can be supplied to the surface and the like.

Further, since the side surface portion of the recess 40 is formed toward the center direction of the drive mechanism 8, the function of the guide portion 40 a that guides the lubricating oil in the center direction of the drive mechanism 8 is provided. The adhering lubricating oil can be effectively and continuously supplied to the

bearings

27 and 31 of the drive mechanism 8, the shaft seal 11 and the sliding surface between the end plate 3a of the movable scroll member 3 and the thrust plate 12. Become.

Therefore, it is possible to suppress wear and heat generation of each bearing portion and sliding portion that require supply of lubricating oil, and to improve the efficiency and durability of the compressor 1.

Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 7 is a cross-sectional view of a scroll compressor showing a second embodiment of the present invention. In order to simplify the description, the same elements as those in the first embodiment are denoted by the same reference numerals.

In the first embodiment, the thrust plate 12 is interposed between the end plate 3 a of the movable scroll member 3 and the thrust receiving portion 13. On the other hand, in 2nd Embodiment, it is the structure which makes the end plate 3a of the movable scroll member 3 contact the thrust receiving part 13 directly, without providing the thrust plate 12. FIG. Other configurations are the same as those of the first embodiment.

In the second embodiment having such a configuration, the outer diameter of the recess 40 in the radial direction of the accommodating space 9 is formed to be smaller than the minimum revolution radius of the movable scroll member 3 with respect to the central axis of the fixed scroll member 3. Thereby, even when the movable scroll member 3 revolves, the accommodation space 9 side and the suction chamber 14 side can be partitioned by the end plate 3 a of the movable scroll member 3.

Accordingly, also in the second embodiment, the lubricating oil supplied from the oil storage chamber 51 of the discharge chamber 20 to the recess 40 of the storage space portion 9 is not sucked into the suction side as it is and remains in the storage space portion 9. be able to. Thereby, the lubricating oil can be sufficiently supplied to the

bearings

27 and 31 of the drive mechanism 8, the shaft seal portion 11, the sliding surface between the end plate 3 a of the movable scroll member 3 and the thrust receiving portion 13, and the first embodiment. Similarly, the wear and heat generation of each bearing portion and sliding portion that require supply of lubricating oil can be suppressed, and the efficiency and durability of the compressor 1 can be improved.

In each of the embodiments described above, the scroll type fluid machine including the oil separator is described. However, in the scroll type fluid machine not including the oil separator, the sucked fluid is used instead of the lubricating oil supply passage 52 of each of the above embodiments. A communication passage that communicates the fluid supply passage space that guides the gas to the compression mechanism side and the concave portion 40 of the housing space portion 9 is formed in the thrust receiving portion 13. As a result, the lubricating oil mixed in the sucked fluid can be introduced into the concave portion 40 of the accommodation space portion 9, so that the

bearings

27 and 31 of the drive mechanism 8, the shaft seal portion 11, and the end of the movable scroll member 3 can be provided. Lubricating oil can be sufficiently supplied to the sliding surface between the plate 3a and the thrust receiving portion 13.

DESCRIPTION OF SYMBOLS 1 Scroll type compressor 2 Fixed scroll member

2a End plate

2b Spiral wrap 3 Movable scroll member

3a End plate

3b Spiral wrap 4 Fluid pocket (sealed space)
5 Front housing (first housing)
6 Center housing (second housing)
7 Rear housing (third housing)
8 Drive mechanism 9 Accommodating space portion 10 Bearing 11 Shaft seal portion 12 Thrust plate 13 Thrust receiving portion 14 Suction chamber 20 Discharge chamber 21 Discharge hole 22 One-way valve 23 Discharge port 24 Drive shaft 27 Bearing 28 Crank 29 Eccentric bush 30 Boss portion 31 Bearing 33 Rotation prevention mechanism 36 Pin 40 of rotation prevention mechanism Recess 40a Guide portion 51 Oil storage chamber 52 Lubricating oil supply passage 53 Opening (recess side)

Claims

An accommodation space for accommodating a drive mechanism of a movable scroll member that revolves in contact with the fixed scroll member and forms a sealed space that changes in volume with the revolution in the first housing. Forming a bearing portion that pivotally supports the drive shaft of the drive mechanism on one end side of the accommodating space portion, and forming a thrust receiving portion that receives the thrust force of the movable scroll member on the other end side of the accommodating space portion. A scroll type fluid machine configured to house the fixed scroll member and the movable scroll member in a second housing joined to an outer peripheral end surface of the first housing on the thrust receiving portion side,
A recess for storing lubricating oil is formed on the peripheral surface of the housing space around the drive mechanism, and a guide for guiding the lubricant in the recess toward the center of the drive mechanism is provided in the recess. Scroll type fluid machine featuring.
In the third housing, which is joined to the outer peripheral portion on the back side of the fixed scroll member of the second housing and into which the compressed fluid is introduced, an oil storage section for storing the lubricating oil separated from the fluid by the oil separator is provided, The scroll type fluid machine according to claim 1, wherein a lubricating oil supply passage communicating the oil storage portion and the recess is formed in the first and second housings.
3. The scroll type fluid machine according to claim 2, wherein the recess side opening position of the lubricating oil supply passage is the bearing side in the central axis direction of the drive mechanism.
The scroll fluid machine according to any one of claims 1 to 3, wherein a plurality of the recesses are provided around a drive mechanism of the accommodation space.
5. The recess according to claim 1, wherein the recess is formed on a peripheral surface around the drive mechanism of the accommodation space along the central axis of the drive mechanism from the thrust receiving portion toward the bearing portion. A scroll type fluid machine as described in 1.
5. The thrust receiving portion is provided with a pin that protrudes toward the movable scroll member and prevents rotation of the movable scroll member, and the plurality of recesses are formed across an attachment region of the pin. 5. A scroll type fluid machine according to 5.
The thrust receiving portion is configured to receive a thrust force of the movable scroll member via a thrust plate, and an outer diameter of the concave portion in a radial direction of the accommodating space portion is smaller than an outer diameter of the thrust plate. 5. The scroll type fluid machine according to 5.
The thrust receiving portion is configured to directly receive the thrust force of the movable scroll member, and the outer diameter of the concave portion in the radial direction of the accommodating space portion is a minimum of the movable scroll member with respect to the central axis of the fixed scroll member. The scroll type fluid machine according to claim 5, wherein the scroll type fluid machine is smaller than a revolution radius.