JPH02298684A - Scroll fluid machine - Google Patents

Abstract

PURPOSE:To prevent lack of lubricant for the sliding part of an Oldham joint by equipping the suction chamber in its inside with an oil sump at which the tip of a lower scroll shaft is facing, and furnishing an oil passage leading to this oil sump and the suction chamber on a lower bearing holder and the lower scroll shaft. CONSTITUTION:An exhaust chamber 3 and a suction chamber 4 are formed in an upper and a lower cylindrical casing 1, 2 to be joined together, wherein the suction chamber 4 accommodates a follower scroll 28 and a driving scroll 18 in synchronous rotation. Scroll shafts 23, 65 are coupled with these scrolls 18, 28, and an Oldham joint 35 is furnished to couple the scrolls 18, 28 revolvingly around the follower shaft 65 which is a lower scroll shaft. A scroll fluid machine of this type is provided in its suction chamber 4 with an oil sump 74 at which the tip of the follower shaft 65 is facing, and this oil sump 74 and the suction chamber 4 are put in mutual communication through a cover 61 as a lower bearing holder and oil passages 63, 68 provided in the follower shaft 65. The oil passage 68 is facing the sliding part of the Oldham joint 35.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scroll fluid machine that rotates a driving scroll and a driven scroll.

[Conventional technology]

In general, various types of scroll fluid machines are known, and among these are so-called fully rotating scroll fluid machines.

Conventionally, this type of scroll fluid machine has been constructed as shown in FIG. To explain this based on the same figure,
In the figure, what is indicated by the symbols 2 and 2 are two upper and lower cylindrical casings forming an exhaust chamber 3 and an intake chamber 4, respectively, and are joined to each other via an OU puffer 5. A partition wall 7 that forms an intake passage 6 that opens downward is provided in the upper casing l. Further, a cover 8 that closes the lower opening is attached to the lower casing 2 via an O-ring 9, and a bearing support 10 that defines the exhaust chamber 3 and the intake chamber 4 is provided. This bearing support lO is provided with a through hole 11 that communicates with the intake passage 6 and the intake chamber 4, and between the opening periphery of this passage hole 11 and the opening periphery of the intake passage 6 is an O ring 12. is interposed. In addition, this bearing support lO has
An oil supply passage 15 is provided for supplying the lubricating oil 13 in the exhaust chamber 3 to the bearing fitting portion 14. Reference numeral 16 denotes an intake plug that communicates with the intake passage 6 and the outside of the casing, and is attached to the peripheral wall of the upper casing 1 of both the casings 1 and 2. Reference numeral 17 denotes an exhaust plug that communicates with the exhaust chamber 3 and the outside of the casing, and is attached to the peripheral wall of the upper casing 1 similarly to the plug 16. Reference numeral 18 denotes a drive scroll having a circular plywood board (not shown), which is provided in the intake chamber 4, and has a discharge port 19 and a suction port 20 in the center and outer circumference, respectively. Two U-shaped arms 21, 22 are fixed to the plywood back side of the drive scroll 18, each of which is spaced 180 degrees apart from each other in the circumferential direction. 23 is a drive shaft extending in the axial direction of both the casings 1 and 2, and is connected to the partition wall 7.
and is rotatably supported by the bearing support 10 via bearings 24 and 25, respectively, and connected to the center portion of the drive scroll 18. The drive shaft 23 is provided with an exhaust passage 26 and an oil supply passage 27 that communicate with the discharge port 19 and a sealed space, which will be described later. Reference numeral 28 denotes a driven scroll having a circular plywood (not shown) facing the base plate (not shown), and is provided in the intake chamber 4 and eccentrically combined with the driving scroll 18. This driven scroll 28 is connected to the driving scroll 1
It is configured to form a closed space (compression chamber) 29 that moves from the outer periphery toward the inner periphery by rotating in synchronization with 8. Further, on the back side of the plywood of the driven scroll 28, two protrusions (not shown) are provided, each facing each other on a bisector perpendicular to the line connecting both the U-shaped arms 21 and 22. There is. 32 is a driven shaft extending in the axial direction of the drive shaft 23, and a bearing 33.32 is mounted on the cover 8.
'34, and is rotatably supported and connected to the center of the driven scroll 28. Reference numeral 35 denotes an Oldham coupling for transmitting rotational force from the driving scroll 18 to the driven scroll 28, which includes an annular body 36 through which the driven shaft 32 is inserted, and a protrusion (not shown) that is protruded from the outer peripheral surface of this annular body 3G. ) and a guide 37 forming a U-shaped groove wall that fits into the free end of the U-shaped arm 21 , 22 , and is provided in the intake chamber 4 . 38 is a vane pump that supplies lubricating oil ]3 to the closed space 29;
Provided around the drive shaft 23 and the bearing support 1
0 via the 0 link 39. This vane pump 38 has a first oil supply passage 40. which opens into the lubricating oil 13. A pump casing 4 having a second oil supply passage 41 communicating with the oil supply passage 15 and a third oil supply passage 43 connected to this oil supply passage 41 via a check valve 42.
4, the pump casing 44 is closed and the check valve 4 is closed.
a cover 46 containing a built-in spring 45 that presses 2;
a rotor 47 provided within the cover 46 and the pump casing 44 and fixed to the drive shaft 23;
The vane 48 is provided around the rotor 47 and housed within the pump casing 44. 49 is a motor for driving scroll fluid machinery;
It is provided outside the upper casing 1. A rotating shaft 50 of the motor 49 is connected to the drive shaft 23 via a coupling 51, and a fan 52 facing into the upper casing 1 is fixed on the shaft. Also,
53 and 54 are oil seals.

In the scroll fluid machine configured in this way,
When the drive scroll 18 is rotated by the motor 49,
This rotational force is transmitted to the driven scroll 28 via the Oldham joint 35. At this time, the fluid drawn into the upper casing 1 from the intake plug 16 flows through the intake passage 6. After passing through the intake chamber 4, flowing between the scrolls 18 and 28, and being compressed in the closed space 29, the exhaust passage 26. It passes through the exhaust chamber 3 and is discharged from the exhaust plug 17 to the outside of the casing.

By the way, in this type of scroll fluid machine, a portion of the lubricating oil in the intake chamber 4 is applied to each scroll 1 by centrifugal force.
8. It is discharged to the outer periphery of 28.

Further, the remaining lubricating oil flows into both scrolls 18.28 and passes through the exhaust passage 26 together with the suction fluid to the exhaust chamber 3.
Spit out inside.

For this reason, the lubricating oil 13 in the intake chamber 4 decreases, resulting in a shortage of lubricating oil to be supplied to the sliding surfaces of each scroll, and the ability to seal the mutual sliding surfaces of the scrolls decreases, resulting in a decrease in leakage function. However, by the operation of the vane pump 38, the lubricating oil 13 in the exhaust chamber 3 is supplied into both scrolls 18 and 28.

That is, when the rotor 47 rotates together with the drive shaft 23,
The lubricating oil 13 is sucked into the pump casing 44 from the first oil supply passage 40 and discharged into the third oil supply passage 43, and the discharge pressure opens the check valve 42 and flows into the second oil supply passage 41. Therefore, the oil passes through the oil supply passages 15 and 27 and is supplied to the closed space 29 within both scrolls 18 and 28.

As a result, a suitable amount of lubricating oil 13 is secured within both scrolls 18,28.

On the other hand, when the rotor 47 stops rotating, the vane pump 3
Since the operation of 8 is stopped, the check valve 42 is closed.

[Problem to be solved by the invention]

However, in the conventional scroll fluid machine, since the Oldham joint 35 is exposed in the intake chamber 4,
When the Oldham joint 35 rotates during scroll operation, the lubricating oil 13 in the intake chamber 4 is scraped up around it by centrifugal force. As a result, the lubricating oil 13 for the sliding parts of the Oldham joint 35 becomes insufficient, and the Oldham joint 35
There was a problem that wear or seizure occurred.

The present invention has been made in view of the above circumstances, and provides a scroll fluid that can prevent the lack of lubricating oil for the sliding parts of Oldham's joints, thereby preventing the occurrence of wear or seizure of Oldham's joints. It provides machinery.

[Means to solve the problem]

In the scroll fluid machine according to the present invention, an oil reservoir is provided below the bearing support, from which the tip of the lower scroll shaft of the upper and lower scroll shafts faces, and an oil passage communicating with the oil reservoir and the intake chamber is connected to the lower bearing support and the lower scroll shaft, respectively. The oil passage for the lower scroll shaft is formed by an oil passage for supplying oil to each sliding part of the Oldham joint.

[For production]

In the present invention, as both scrolls rotate, lubricating oil in the oil reservoir is supplied to the sliding portion of the Oldham joint through the oil passage of the lower scroll shaft.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the structure etc. of this invention will be explained in detail by the Example shown in the figure.

FIG. 1 is a cross-sectional view showing the entire scroll fluid machine according to the present invention, and FIG. In FIG. 6, the same members are given the same reference numerals and detailed explanations are omitted. In the same figure,
A cover designated by the reference numeral 61 has a space 62 opening downward, and is attached to the lower casing 2 of the casings 1 and 2 at the periphery of the opening via the O-ring 9.

This cover 61 is provided with an oil passage 63 that communicates with the intake chamber 4 and an oil reservoir to be described later, and a through hole 64 that opens in the axial direction of both the casings 1°2. 65
A driven shaft extends in the axial direction of the drive shaft 23, is connected to the center of the driven scroll 28, and is supported in the through hole 64 via bearings 66, 67. This driven shaft 65 has a sliding portion 35a of the Oldham joint 35.
, 35b is provided with an oil passage 68 for supplying oil.

The oil passage 68 includes a suction port 69 that opens at the center of the tip of the driven shaft 23, an eccentric a70 that is provided at a position eccentric to the suction port 69 and extends in the axial direction, and an eccentric hole 70.
horizontal oil supply passages 71. It is composed of an inclined oil supply path 72. Of these, the horizontal oil supply passage 71 is opened in the radial direction of the driven shaft 65, and the axial position of this opening is approximately the same as the sliding parts 35a, 35b of the Oldham joint 35, and the circumferential direction The position is the sliding part 35a,
It is located at the same position as 35b. Reference numeral 73 denotes a container having an oil reservoir 74 inside thereof, which the tip of the driven shaft 65 faces, and is attached to the cover 61 and housed in the space 62. Here, the horizontal oil supply path 71.
The number of inclined horizontal passages 72 and eccentric holes 700 is four each, and their symbols are 71a to 71d, 72a to 72d,
70a to 70d. In addition, 75 is the above-mentioned both bearings 66
, 67 is a bearing holder that holds the lower bearing 67.

Further, 76 is a protrusion provided on the back side of the plywood of the driven scroll 28 and fitted into the guide 37.

In the scroll fluid machine configured in this way,
When the drive scroll 18 is rotated by the motor 49,
This rotational force is transmitted to the driven scroll 28 via the Oldham joint 35. At this time, since a pumping action is generated by centrifugal force, the lubricating oil 13 in the oil reservoir 74 is transferred to the suction port 6.
9, and the inclined oil supply path 72. The oil is discharged from the horizontal supply passage 71 through the eccentric hole 70 into the intake chamber 4 in the direction shown by arrow A in FIG.
5a and 35b.

On the other hand, the lubricating oil 13 discharged from the intake chamber 4 is transferred to the oil passage 6.
3 and is returned to the oil sump 74.

Although this embodiment shows an example in which oil is supplied directly from the oil passage 68 to the sliding parts 35a and 35b of the Oldham joint 35, the present invention is not limited to this. For example, as shown in FIG. By providing the annular body 36 with an oil hole 81 that opens into the guide 37 and penetrates in the radial direction, the sliding portions 35a, 35 of the Oldham joint 35 can be more effectively removed.
b can be refueled.

Further, in the present invention, as shown in FIG.
1 is provided with a cylindrical layer 82 interposed between the Oldham joint 35 and the driven shaft 65, and a plurality of through holes 83 opening in the radial direction are provided in the cylindrical layer 82, so that the sliding portion 35a of the Oldham joint 35, 35b and the bearings 66, 67 can be supplied with lubricating oil 13. In this case, only one eccentric hole 70° horizontal oil supply passage 71 and one inclined oil supply passage 72 are required.

In the scroll fluid machine configured in this way,
The lubricating oil 13 discharged from the horizontal oil supply passage 71 flows into the cylindrical layer 8
2 and a portion is supplied to bearings 66 and 67. Further, the remaining lubricating oil 13 is scattered in the radial direction by centrifugal force, passes through the through hole 83 and between the cylindrical layer 82 and the driven scroll 28, and passes through the sliding portion 35a of the Oldham joint 35,
35b.

Furthermore, the suction shape of the driven shaft 32 in the present invention is not limited to the above-mentioned embodiment, and the same pumping action as in the embodiment can be obtained by using a structure as shown in FIGS. 5(a) to 5(C), for example. can. In the same figure (al and ('b),
The driven shaft 9I has an eccentric hole 92 extending in the axial direction, and 93 and 94 are attached to the tip of the driven shaft 91 so as to close the opening of the eccentric hole 92, and suction ports 95, 96 are provided. It is a suction cover that has a

Further, 97 and 98 are spaces provided within these suction covers 93 and 94 and communicating with the suction ports 95 and 96 and the eccentric hole 92. In the same figure (C), what is indicated by the reference numeral 99 is an eccentric hole 100 extending in the axial direction, and the eccentric hole 100 extending in the axial direction.
00 and has an oil supply path 101 consisting of a horizontal path 101a and a vertical path 101b; 102 is this driven shaft 9;
This is a plug that seals the opening of the horizontal passage 101a among the oil supply passages 101 of No. 9.

〔Effect of the invention〕

As explained above, according to the present invention, an oil reservoir is provided below the bearing support, and the oil reservoir facing the tip of the lower scroll shaft of the upper and lower scroll shafts is provided, and the oil passage communicating with the oil reservoir and the intake chamber is connected to the lower bearing support. and the lower scroll shaft, and the oil passage for the lower scroll shaft is formed by the oil passage that supplies oil to each sliding part of the Oldham joint, so that as both scrolls rotate, the lubricating oil in the oil reservoir is transferred to the oil on the lower scroll shaft. It is reliably supplied to the sliding part of the Oldham joint through the passage.

Therefore, it is possible to prevent the lubricating oil from being insufficient in the sliding portion of the Oldham joint, thereby preventing the occurrence of wear or seizure of the Oldham joint.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the entire scroll fluid machine according to the present invention, FIG. 4 is a sectional view showing another embodiment, and FIG. 5 is a sectional view showing another embodiment.
Figures ta) to (C) are local sectional views showing examples of the suction shape of the scroll shaft, and Fig. 6 is a sectional view showing the entire conventional scroll fluid machine. l... Upper casing, 2... Lower casing, 4... Intake chamber, 7... Partition wall, 10...
Bearing support, 18... Drive scroll, 23...
Drive shaft, 28... Driven scroll, 29... Sealed space, 35... Oldham joint, 35a, 35
b...Sliding part, 61...Cover, 63...
・Oil passage, 65...driven shaft, 68...oil passage,
74...Oil sump. Agent Masu Oiwa Onie Ti
Two words 2. 2, 76-4

Claims (1)

[Claims] Two upper and lower scrolls are provided in the intake chamber of the casing and are assembled eccentrically to each other to form a closed space in which they move by rotating synchronously, and two upper and lower scrolls each connected to these scrolls and supported by a bearing support. In a scroll fluid machine equipped with a scroll shaft and an Oldham joint provided around a lower scroll shaft of both scroll shafts and pivotally connecting the scrolls, the tip of the lower scroll shaft is located within the intake chamber. A facing oil sump is provided, and oil passages communicating with the oil sump and the intake chamber are provided in the lower bearing support and the lower scroll shaft among the bearing supports, and the oil passage of the lower scroll shaft is provided in each of the Oldham joints. A scroll fluid machine characterized in that it is formed by an oil passage that supplies oil to a sliding part.