JP2002161879A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain positive lubrication for a shaft sealing device by forming circulation flow passing through the shaft sealing device with a part of inlet refrigerant gas. SOLUTION: A cutout slope surface 136 facing a large-diameter part 141 side of a driving shaft 140, that is, a bearing 150 side is formed at a rotating lead side shoulder part of a balance weight 132 as a refrigerant gas feeding means. A through-hole 144 piercing a section between the inner end surface and the outer end surface is drilled in the large-diameter part 141 of the driving shaft 140 as a return passage of the refrigerant gas. A cutout recessed part 145 communicating with the through-hole 144 and coming into contact with a driving protrusion 142 is provided around an opening part of the through-hole 144 in the inner end surface of the large diameter 141. cutout grooves are provided at four corners of fitting holes of a bush 143.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubrication mechanism for a scroll compressor.

[0002]

2. Description of the Related Art Conventionally, as a lubrication mechanism for a scroll type compressor, a lubrication mechanism disclosed in Japanese Patent Laid-Open No. Hei 7-109998 has been proposed. In this case, an intake port is provided at an upper portion of the front housing in correspondence with the rotation locus of the balance weight, and a change in the balance weight for redirecting the refrigerant gas flowing from the intake port into the crank chamber in the thrust direction. Directional means is provided, whereby the refrigerant gas diverted by the diverting means is supplied to a radial bearing for supporting a drive shaft and a movable scroll member, and further to a rotation preventing mechanism, and mist contained in the refrigerant gas. The lubricating oil is used to lubricate them.

[0003]

However, in this prior art, the lubrication of a radial bearing for supporting a drive shaft disposed around a balance weight, a needle bearing for supporting a movable scroll member, and a rotation preventing mechanism, etc., has been proposed. Although there is an effect, the shaft sealing device disposed at a position where the drive shaft protrudes outside the housing is located further inside a radial bearing or the like that supports the drive shaft. There is a problem that lubrication is not sufficiently performed due to stagnation or the like.

The present invention has been made in view of the problems existing in the prior art as described above, and an object of the present invention is to make it possible to use a part of the suction refrigerant gas for circulation through a shaft sealing device. To create a flow, thereby ensuring lubrication of the shaft sealing device.

[0005]

According to a first aspect of the present invention, a fixed scroll member and a movable scroll member are meshed with each other in a housing. A large diameter portion of the drive shaft is supported on the front side of the drive shaft via a bearing, and a bush is fitted to a drive projection protruding at an eccentric position on the inner end surface of the large diameter portion, and the bush is bossed on the end surface of the movable scroll member. The movable scroll member is revolved around the axis of the fixed scroll member by rotation of the drive shaft, and a balance weight is mounted on the bush to balance movement during the revolving motion of the movable scroll member. In the scroll type compressor, the clearance between the bearing or the housing and the drive shaft is provided with respect to the balance weight. A means for feeding refrigerant gas for lubricating the provided shaft sealing device is provided, and a return passage communicating between the inner end surface and the outer end surface is provided in the large diameter portion of the drive shaft. .

According to this invention, the balance weight feeding means reaches the shaft sealing device via the bearing for supporting the drive shaft, and continuously returns from there to the suction chamber via the return passage of the large diameter portion of the drive shaft. As a result, a series of circulating flows of a part of the suction refrigerant gas are formed, so that the shaft sealing device disposed at a relatively deep position is also reliably lubricated.

According to a second aspect of the present invention, there is provided a scroll type compressor according to the first aspect, wherein the return passage is provided in at least one of the large diameter portion of the drive shaft and the end face facing the bush. And a cut-out recess which is in communication with the drive projection and is in contact with the drive projection.

Therefore, according to the present invention, the above claim 1 is provided.
In addition to the operation described in relation to the invention described in the above, further, it is possible to supply the refrigerant gas containing the lubricating oil that has passed through the return passage to the fitting portion between the drive projection and the bush via the notch recess. Therefore, the fitting portion between the drive projection and the bush and the needle bearing can be lubricated.

According to a third aspect of the present invention, in contrast to the second aspect of the invention, the notch recess has a substantially triangular shape so as to widen toward the opening side, and the rotational direction of the drive shaft is different from that of the second aspect. The rear side is inclined more toward the rotation direction than the radius line of the drive shaft.

Therefore, according to the present invention, the above claim 2 is provided.
In addition to the effects described in connection with the invention described in (1), the lubricating oil can be efficiently supplied to the drive projection while collecting at the rear side in the rotational direction of the notch recess.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the feeding means is specified as a notched slope.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the return passage is specified as a through hole provided in a large diameter portion.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, at least one of the drive projection and a fitting hole of a bush fitted to the drive projection is provided with a refrigerant. It has a configuration in which a cutout groove for allowing gas to pass is formed.

Therefore, according to the present invention, the above claim 1 is provided.
In addition to the effects described in relation to any one of the inventions described above, the lubrication of the fitting portion between the driving projection and the fitting hole and the needle bearing can be further performed.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, a flat portion is formed on the outer periphery of the driving projection, and the inner surface of the fitting hole is formed so as to correspond to the outer flat surface portion. A flat portion is formed, and the cutout grooves are formed on both side edges of the inner circumferential flat portion.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. First,
The overall configuration of the scroll compressor will be described with reference to FIG. Reference numeral 110 denotes a housing in which the fixed scroll member 120 is integrally formed. 130 is the fixed scroll member 1
A movable scroll member that is capable of turning with respect to 20;
The scroll members 120 and 130 have a spiral scroll tooth portion 12 which forms a working chamber P into which the refrigerant gas is sucked.
1, 131 are formed. In the present embodiment, the compression mechanism CP that sucks and compresses the refrigerant gas is configured by expanding and reducing the volume of the working chamber P formed by the two scroll members 120 and 130.
In addition, Ps is a suction port connected to the evaporator (not shown) side of the refrigeration cycle.
Is communicated with the suction chamber 125 formed in the inner space of the.
Pd is a discharge port connected to a condenser (not shown) of the refrigeration cycle.

Reference numeral 140 denotes a drive shaft for orbiting the movable scroll member 130. The drive shaft 140 passes through the inside and outside of the front housing 111, and one end side (left side in the drawing) is exposed outside the front housing 111. In the present embodiment, the drive shaft 140 is connected to one end of the drive shaft (a portion exposed outside the front housing 111) via an electromagnetic clutch (not shown). ).

In the front housing 111,
A radial bearing (hereinafter, referred to as a bearing) that rotatably supports the drive shaft 140 at its large diameter portion 141.
150 are provided. On the electromagnetic clutch side in the vicinity of the bearing 150, the gap between the drive shaft 140 and the front housing 111 is sealed to prevent leakage of refrigerant gas and lubricating oil outside the front housing 111, that is, outside the compressor. Shaft sealing device 1 such as a lip seal
60 are provided. At this time, it is preferable that the shaft sealing device 160 is disposed very close to and in contact with the end face of the bearing 150.

A drive projection 142 is provided at the other end of the drive shaft 140 (right side in the drawing), that is, at an eccentric position of the inner end surface of the large diameter portion 141. A bush 143 is fitted to the driving projection 142, and the bush 143 is further connected to the movable scroll member 13 via a needle bearing 170.
0 boss 133. Reference numeral 180 denotes a well-known pin-ring type anti-rotation mechanism that prevents the movable scroll member 130 from rotating. When the drive shaft 140 is rotated by the anti-rotation mechanism 180, the movable scroll member 130 does not rotate. It turns (revolves) around the drive shaft 140.

Reference numeral 132 denotes a movable scroll member 130.
This is a balance weight that turns with the turning of the shaft and cancels out the eccentric force (centrifugal force generated in the movable scroll member 130) acting on the drive shaft 140. 190 is a discharge chamber,
Reference numeral 191 denotes a discharge port that connects the working chamber P and the discharge chamber 190. Reference numeral 192 denotes a reed valve-shaped discharge valve for preventing the backflow of the refrigerant gas from the discharge chamber 190 to the working chamber P. Reference numeral 193 denotes a retainer for restricting the maximum opening of the discharge valve 192.

Next, the details will be described with reference to FIGS. The drive projection 142 is loosely fitted in the fitting hole 135 of the bush 143, and the balance weight 132 is fitted and fixed to the outer periphery of the bush 143. Then, the rotation lead side shoulder 13 of the balance weight 132
4 has a notched slope 1 as a feeding means facing the large-diameter portion 141 side of the drive shaft 140, that is, the bearing 150 side.
36 are formed.

The large diameter portion 141 of the drive shaft 140 includes
The inner end face (the bush 143 side) and the outer end face (the shaft sealing device 1)
60 side) as a return passage penetrating between
Is engraved. In addition, on the inner end surface of the large diameter portion 141, near the opening of the through hole 144, the through hole 1
A cutout recess 145 is provided that communicates with 44 and is in contact with the drive projection 142 (the surface of the drive projection 142 faces directly). The notch 145 has a substantially triangular shape so as to widen toward the opening toward the outer periphery.
The rotation-side rear side 146 is inclined closer to the rotation direction than the radius line of the drive shaft 140.

Next, the operation of this embodiment will be described. When the drive shaft 140 is rotated by the driving force of a power source, for example, a vehicle driving engine, the movable scroll member 1 is rotated.
30 revolves, causing a suction / compression operation in the working chamber P with the fixed scroll member 120, and the refrigerant gas introduced into the suction chamber 125 from the suction port Ps is compressed in the working chamber P and discharged into the discharge port. After being discharged from the discharge chamber 191 to the discharge chamber 190, it is discharged to the refrigeration cycle via the discharge port Pd.

A part of the refrigerant gas filled in the suction chamber 125 flows toward the bearing 150 in the axial direction due to the rectifying action of the notched slope 136 caused by the rotating force of the balance weight 132. The refrigerant gas flowing in the direction of the bearing 150 passes through the inside of the bearing 150 to reach the shaft sealing device 160, and from there through a through-hole 144 formed in the large-diameter portion 141 of the drive shaft 140, a notch is formed. Place 1
Flows to 45. From the notch recess 145, the lubricating oil mainly reaches the drive projection 142, reaches the end face of the bush 143 through the gap with the fitting hole 135, and then passes through the needle bearing 170 to the suction chamber 125. Returning, this forms a series of circular paths for the refrigerant gas containing the lubricating oil. That is, the notched slope 136 that performs so-called “feeding”
Only a combination of the (feeding means) and the through-hole 144 (return passage) for securing a so-called "return passage" forms a series of circulation paths capable of effective distribution for the first time. Here, in the notch recess 145, the lubricating oil led out from the through hole 144 by the drawing action of the rear side 146 in the rotation direction (because it is inclined closer to the rotation direction than the radius line), and the surroundings The lubricating oil floating in the suction chamber of the section can be taken in and effectively guided to the drive projection 142. This also contributes to strengthening the effective distribution of the series of circuit routes.

As the refrigerant gas containing the lubricating oil flows on the above-described circuit, lubrication and cooling of each sliding portion, that is, the bearing 150, the shaft sealing device 160, the driving protrusion 142, the needle bearing 170, and the like are performed. Is done well.

The effects that can be expected from the above embodiment will be described below. (A) By forcibly supplying the lubricating oil to the bearing, lubrication of the bearing is sufficiently performed and the life can be extended. (B) By forcibly supplying the lubricating oil to the shaft sealing device, wear can be reduced and the life can be extended, and the airtightness of the compressor can be maintained for a relatively long period. (C) The lubricating oil returned from the through hole penetrated through the large-diameter portion of the drive shaft lubricates the drive projection and the needle bearing located at the boss portion of the movable scroll member, and can extend the life of these. .

(Second Embodiment) As another embodiment of the fitting hole 135 in the first embodiment, the one shown in FIG. 5 is proposed. That is, in this embodiment, the fitting hole 135 is separated from the flat portion 135a slidably corresponding to the outer flat portion 142a of the driving projection 142 and the outer circumferential arc surface portion 142b of the driving projection 142 by a minute gap. It is formed of a facing arc-shaped surface portion 135b. At the four corners of the fitting hole 135, notched grooves 135c for allowing the passage of the refrigerant gas are provided extending in the axial direction.

When the compressor is in operation, the refrigerant gas containing the lubricating oil provided from the notch recess 145 is guided to the fitting hole 135 and is efficiently sent through the notch groove 135c.

According to the second embodiment, since the refrigerant gas containing the lubricating oil is efficiently introduced through the notch groove 135c, the lubrication between the driving projection 142 and the fitting hole 135 is sufficiently provided. Of course, the notch 135
By sufficiently securing the refrigerant gas passage by c, the circulation of the circulation path of the refrigerant gas is strengthened, so that all the lubrication and cooling of the portion where the circulation flow of the refrigerant gas passes is more effective. Has the effect of being performed in

The present invention is not limited to the above embodiments, but can be implemented as follows. In place of the cutout slope formed in the balance weight, a straightening plate inclined in the same direction may be separately attached to the rotating lead side shoulder of the balance weight. In the above embodiment, the through hole of the large-diameter portion of the drive shaft is a straight line parallel to the axis of the drive shaft. However, the through hole may be inclined in an appropriate direction with respect to the axis. Other shapes may be used. According to this, it is possible to further promote the flow of the refrigerant gas and the lubricating oil by using the rotational force of the drive shaft. In addition, the return passage is replaced with a through hole, and a groove formed on the peripheral surface of the large-diameter portion of the drive shaft (communicates between the inner peripheral surface (the bush side) and the outer end surface (the shaft sealing device side)). Is also possible. The notch recess is provided on the inner end surface of the large-diameter portion of the drive shaft in the above embodiment, but may be provided on the end surface of the bush facing the inner end surface of the large-diameter portion of the drive shaft. This also exerts the same function and effect. In the first aspect, the expression "to attach the balance weight to the bush" is used, but those originally formed integrally are also included in the practicable range of the present invention. In the second embodiment, the cutout groove 135c is provided in the fitting hole 135. However, the cutout groove 135c may be provided on the drive protrusion 142 side, or may be provided on both of them.

[0031]

As described above, according to the present invention, a series of circulation paths of the refrigerant gas and the lubricating oil can be formed by the combination of the feeding means formed on the balance weight and the return path of the large-diameter portion of the drive shaft. The lubricating oil can be effectively and reliably supplied by this, so that the life of the bearing and the shaft sealing device can be extended, and the airtightness of the compressor can be maintained for a long time. Has an effect.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a scroll type compressor.

FIG. 2 is an exploded perspective view showing a drive shaft and a balance weight.

FIG. 3 is a front view showing a balance weight and a bush;

FIG. 4 is a side view showing the inner end surface of the large-diameter portion of the drive shaft.

FIG. 5 is a side view showing another embodiment of the fitting hole.

[Explanation of symbols]

Reference Signs List 110 housing 111 front housing constituting a part of housing 120 fixed scroll member 125 suction chamber 130 movable scroll member 132 balance weight 135 fitting hole 135c cutout groove 136 cutout slope as feeding means 140 drive shaft 141 large diameter portion 142 drive protrusion 143 bush 144 through hole as return passage 145 notch recess 150 bearing 160 shaft sealing device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinsuke Aso 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation (72) Inventor Nobuyuki Amano 2-1-1 Toyota-cho, Kariya-shi, Aichi F term in Toyota Industries Corporation (reference) 3H029 AA02 AA17 BB01 CC16 CC17 CC32 3H039 AA02 AA12 BB11 CC12 CC19 CC20 CC31 CC41

Claims (7)

[Claims] 1. A fixed scroll member and a movable scroll member are meshed with each other in a housing, a large diameter portion of a drive shaft is supported on a front side of the housing via a bearing, and an inner end surface eccentric position of the large diameter portion. A bush is fitted to a drive projection protruding from the movable scroll member, the bush is engaged with a boss on the end surface of the movable scroll member, and the movable scroll member revolves around the axis of the fixed scroll member by rotation of the drive shaft. Further, in a scroll type compressor equipped with a balance weight for keeping a motion balance with the bush during the revolving motion of the movable scroll member, the scroll weight is provided in a gap between the bearing or the housing and the drive shaft with respect to the balance weight. Providing means for feeding refrigerant gas for lubricating the shaft sealing device, and
A scroll compressor, wherein a large diameter portion of the drive shaft is provided with a refrigerant gas return passage communicating between an inner end surface and an outer end surface. 2. A notch recess communicating with the return passage and being in contact with the drive projection is formed in at least one of the opposed end surfaces of the large-diameter portion of the drive shaft and the bush. Scroll type compressor. 3. The notch recess is formed in a large-diameter portion of the drive shaft, has a substantially triangular shape so as to widen toward an opening side, and has a rear side in the rotation direction of the drive shaft defined by a radial line of the drive shaft. 3. The scroll compressor according to claim 2, wherein the scroll compressor is tilted closer to the rotation direction. 4. The scroll-type compressor according to claim 1, wherein said feeding means is a notched slope facing the bearing side on a shoulder portion of said balance weight on a rotating lead side. 5. The scroll compressor according to claim 1, wherein said return passage is a through hole provided in a large diameter portion. 6. The drive projection according to claim 1, wherein a cutout groove is formed in at least one of the drive protrusion and a fitting hole of the bush to be fitted in the drive protrusion to allow passage of refrigerant gas. The scroll-type compressor as described. 7. A flat portion is formed on an outer periphery of the driving projection,
7. The scroll compressor according to claim 6, wherein a flat portion is formed on an inner circumference of the fitting hole so as to correspond to the outer flat portion, and the cutout grooves are formed on both side edges of the inner circumferential flat portion.