JP2001003883A - Scroll type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type fluid machine prevented from a lubrication running-out even after a long-term stop. SOLUTION: In a scroll type fluid machine having a body housing, and a turning scroll and a fixed scroll provided in the body housing so as to be mutually turnable, an oil groove 15 is provided at a sliding surface of a thrust bearing part with which the turning scroll comes in sliding contact, and key grooves 17 of an Oldham's ring are provided at the outer periphery of the sliding surface. The sliding surface of the thrust bearing part is further provided with other oil grooves 23 linearly extending from the oil groove 15 toward the key grooves 17 along the tangent of the oil groove 15 in the rotating direction of the turning scroll.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine, and more particularly to a scroll type fluid machine which can prevent seizing of an Oldham ring.

[0002]

2. Description of the Related Art As is well known, scroll type fluid machines which can operate with high efficiency and low noise have been widely used as compressors for air conditioning and refrigeration. This example will be described with reference to FIG. 8. The scroll type fluid machine includes a body housing 1, a scroll type compression mechanism C, and an electric motor 2, and a rotating shaft 3 of the electric motor 2 is connected to a lower portion of the scroll type compression mechanism C. I have.

The scroll type compression mechanism C includes a pair of end plates and a pair of scrolls 4 and 5 formed of spiral wraps erected on the inner surface of the end plates and meshes with each other. The electric motor 2 performs a revolving motion relatively to the other scroll (fixed scroll 5) fixed to the frame 6 via the rotating shaft 3.

An eccentric pin 7 is provided at the upper end of the rotating shaft 3 of the electric motor 2 at a position eccentric from the axis by a predetermined amount. The eccentric pin 7 is inserted into a cylindrical boss portion that stands upright along the axis below the orbiting scroll 4, and when the rotating shaft 3 rotates, the orbiting scroll 4 is fixed via the eccentric pin 7. Of the orbiting scroll 8 is eccentric about the axis of the rotating scroll 4 to prevent the orbiting scroll 4 from rotating. By the orbiting motion of the orbiting scroll 4, the plurality of compression chambers 9, which are closed spaces, are moved from the outer suction port to the central discharge port 1.
The compression work is performed by gradually reducing the volume while moving toward zero.

Here, a discharge cover 11 serving as a partition wall is fixed above the fixed scroll 5 while maintaining an airtight state, and is provided so as to partition the top housing 12 and the body housing 1 up and down. A discharge chamber 13 serving as a high-pressure chamber is formed above the body cover 1 with the discharge cover 11 as a boundary. The discharge chamber 13 is connected to a discharge pipe 14, and compressed refrigerant gas is discharged from the discharge pipe 14.

FIG. 9 shows a frame 6.
Is provided with an Oldham ring 8 interposed between the orbiting scroll 4 and the orbiting scroll 4 on the outer peripheral portion thereof.
The key groove 17 of the Oldham ring 8 is provided outside the oil groove 15. It should be noted that in FIG.
Reference numeral 8 denotes a motor rotor, 19 denotes a motor stator, 20 denotes a drive bush, 21 denotes an oil supply hole, and 22 denotes an oil return pipe.

Therefore, in the conventional scroll type fluid machine, during operation, the lubricating oil stored in the lower portion of the body housing 1 turns through the oil supply hole 21 provided in the rotary shaft 3 as shown by an arrow in FIG. The lower portion of the boss of the scroll 4 is supplied with oil. Further, the lubricating oil passes through the gap between the eccentric pin 7 and the drive bush 20 and fills the orbiting volume 16 where the boss of the orbiting scroll 4 makes an orbital movement. Is supplied to the keyway 17 of the Oldham ring 8. The surplus amount of the lubricating oil that supplies the sliding portions is returned to the lower portion via the oil return pipe 22 from the orbiting volume 16 where the boss of the orbiting scroll 4 orbits.

Here, lubricating oil that has been supplied between the orbiting scroll 4 and the thrust bearing portion of the frame 6 and supplied to the key groove 17 of the Oldham ring 8 is then sucked into the compression chamber 9 from the scroll suction port. Although the scrolls 4 and 5 are lubricated, if the amount of oil is too large, the amount of oil circulation increases, which causes a reduction in unit efficiency. For this reason, by controlling the return amount of the surplus lubricating oil that has supplied the sliding portion from the swirl volume 16 by adjusting the diameter of the oil return pipe 22, the reliability and efficiency of the sliding portion are ensured. It balances maintenance. As this type of technology, for example, Japanese Patent Publication No. 6-9
There is one disclosed in Japanese Patent No. 2795.

[0009]

By adopting the above configuration relating to lubrication, it is possible to obtain a sufficient amount of lubrication necessary for lubricating the sliding portion during steady operation, and to improve the reliability of the sliding portion. Although it is advantageous in that it can be increased, the following problem occurs at the time of startup after a long-term stop or the like. That is, during a long term stoppage, refrigerant movement occurs due to a temperature difference between the indoor and outdoor units, and when the refrigerant gas returned to the scroll-type fluid machine condenses, the lubricating oil in the sliding portion is washed away. When such refrigerant movement occurs several times, the sliding portion is almost in a non-lubricated state.
Are liable to seize with the key groove 17. Therefore,
After a long-term stop, it is necessary to check the condition of lack of lubrication at the time of startup, and there is a problem that work efficiency is poor.

It is possible to change the degree of lubrication by adjusting the diameter of the oil return pipe 22. Control by adjusting the diameter cannot be dealt with alone. Accordingly, the present invention provides a scroll-type fluid machine that does not run out of lubrication even at the time of startup after a long-term stop.

[0011]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention described in claim 1 has a sealed housing, and a revolving scroll and a fixed scroll provided in the sealed housing so as to be revolvable with each other. In the scroll type fluid machine, an oil groove is provided on a sliding surface of a thrust bearing portion with which the orbiting scroll slides, and a key groove of an Oldham ring is provided outside the sliding surface. A communication path is provided. With this configuration, when the lubricating oil is supplied to the oil groove, the lubricating oil is quickly supplied to the key groove of the Oldham ring through the communication path, so that even when the engine is started after a long-term stop, the oil dam is supplied to the Oldham ring. Quick lubrication of the ring is possible.

According to a second aspect of the present invention, there is provided a scroll-type fluid machine having a closed housing, a revolving scroll and a fixed scroll provided in the closed housing so as to be revolvable with each other, and the thrust bearing in which the revolving scroll slides. An annular oil groove is provided on the sliding surface of the portion, and a key groove of the Oldham ring is provided on the outside of the sliding surface. The sliding surface of the thrust bearing portion is turned from the oil groove to the key groove and turned. Another oil groove is provided that extends linearly or curvedly in the scroll rotation direction along the tangent to the oil groove. With this configuration,
When the lubricating oil is supplied to the oil groove, the lubricating oil is urged by the orbiting motion of the orbiting scroll and quickly supplied to the key groove of the Oldham ring through another oil groove on the sliding surface of the thrust bearing portion. In addition, the Oldham ring can be quickly lubricated even at the time of startup after a long-term stop.

According to a third aspect of the present invention, there is provided a scroll-type fluid machine having a closed housing, a revolving scroll and a fixed scroll provided in the closed housing so as to be revolvable with each other, and the thrust bearing on which the revolving scroll slides. A swivel volume portion for accommodating a drive bush for driving the orbiting scroll is provided at the center of the sliding surface of the portion, and a key groove of an Oldham ring is provided outside the sliding surface, and a sliding surface of the thrust bearing portion is provided. In the direction of rotation of the orbiting scroll from the orbiting volume toward the keyway, and linearly along the tangent to the outer periphery of the orbiting volume,
Alternatively, another oil groove extending in a curved manner is provided. With this configuration, when lubricating oil is supplied to the orbiting volume, the lubricating oil is urged by the orbiting motion of the orbiting scroll and passes from the orbiting volume to another oil groove on the sliding surface of the thrust bearing. As a result, the Oldham ring is quickly supplied to the key groove of the Oldham ring.

According to a fourth aspect of the present invention, there is provided a scroll-type fluid machine having a closed housing, a revolving scroll and a fixed scroll provided in the closed housing so as to be revolvable with each other, and the thrust bearing on which the revolving scroll slides. In the center of the sliding surface of the portion, there is provided a revolving volume portion for receiving the boss portion of the revolving scroll and permitting the revolving motion of the boss portion, and a key groove of the Oldham ring is provided outside the sliding surface, An oil communication hole penetrating from the volume to the key groove is provided. With this configuration, when lubricating oil is supplied to the orbiting volume, the lubricating oil is prompted by the orbiting motion of the boss portion of the orbiting scroll, and quickly from the orbiting volume to the Oldham ring through the oil communication hole. As a result, the Oldham ring can be quickly lubricated even at the time of startup after a long-term stop.

According to a fifth aspect of the present invention, there is provided a scroll type fluid machine having a closed housing, a revolving scroll and a fixed scroll provided in the closed housing so as to be revolvable with respect to each other. A key groove of the Oldham ring is provided outside the sliding surface of the contacting thrust bearing portion, and a recess for oil sump is provided on the sliding contact surface of the end plate of the orbiting scroll near the key groove of the thrust bearing portion. It is characterized by. With this configuration, when lubricating oil is supplied to the concave portion of the end plate of the orbiting scroll, the lubricating oil is promptly supplied to the keyway of the Oldham ring from the concave portion by the revolving motion of the orbiting scroll. In addition, the Oldham ring can be quickly lubricated even at the time of startup after a long-term stop.

According to a sixth aspect of the present invention, there is provided a scroll type fluid machine having a closed housing, a revolving scroll and a fixed scroll provided in the closed housing so as to be revolvable with respect to each other. At the center of the sliding surface of the contacting thrust bearing portion, there is provided a turning volume portion for receiving the boss portion of the turning scroll and permitting the turning motion of the boss portion, and a key groove of the Oldham ring is provided outside the sliding surface. A recess for an oil reservoir is provided on the sliding surface of the end plate of the orbiting scroll in the vicinity of the keyway of the thrust bearing portion, and the recess is formed in the orbiting volume or the keyway along with the orbiting movement of the orbiting scroll. It is characterized by being configured to be able to communicate with at least one. With this configuration, when the lubricating oil is supplied to the concave portion of the end plate of the orbiting scroll, the lubricating oil is promptly supplied to the key groove of the thrust bearing portion by the orbiting motion of the orbiting scroll. Therefore, the Oldham ring can be quickly lubricated even during startup after a long-term stop. Here, since the concave portion is configured to be able to communicate with at least one of the orbiting volume portion and the portion where the key groove is arranged in accordance with the orbiting motion of the orbiting scroll, lubricating oil is quickly supplied from the orbiting volume portion and Oil can be quickly supplied to the Oldham ring.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. 1 (the same applies to other embodiments) with reference to FIG. In the following description, the same parts as those of the above-mentioned conventional configuration are denoted by the same reference numerals and described. In FIG. 8, a scroll type fluid machine includes a body housing 1 (sealed housing), a scroll type compression mechanism C, and an electric motor 2.
The rotary shaft 3 of the electric motor 2 is connected to a lower portion of the scroll-type compression mechanism C. The scroll-type compression mechanism C includes an orbiting scroll 4 (FIG. 1) composed of an end plate and a spiral wrap erected on its inner surface. The turning direction is indicated by an arrow) and the fixed scroll 5 are engaged with each other to perform a relative turning motion.

An eccentric pin 7 is provided at the upper end of the rotary shaft 3 of the electric motor 2 at a position eccentric from the axis by a predetermined amount. The eccentric pin 7 is inserted into a cylindrical boss B which is provided upright on the lower part of the orbiting scroll 4 with the same axis, and when the rotating shaft 3 rotates, the eccentric pin 7 passes through the eccentric pin 7.
The orbiting scroll 4 eccentrically moves around the axis of the fixed scroll 5 and performs an orbiting motion by the action of the Oldham ring 8 that prevents the orbiting scroll 4 from rotating. Orbiting scroll 4
As the plurality of compression chambers 9, which are closed spaces, move from the outer suction port to the central discharge port 10, the volume of the compression chamber 9 gradually decreases to perform compression work.

A discharge cover 11 serving as a partition wall is fixed above the fixed scroll 5 while maintaining an airtight state, and is provided so as to partition the top housing 12 and the body housing 1 up and down. A discharge chamber 13 serving as a high-pressure chamber is formed above the body cover 1 with the discharge cover 11 as a boundary. The discharge chamber 13 is connected to a discharge pipe 14, and compressed refrigerant gas is discharged from the discharge pipe 14.
Reference numeral 18 denotes a motor rotor, 19 denotes a motor stator, 20
Denotes a drive bush, 21 denotes an oil supply hole, and 22 denotes an oil return pipe.

FIG. 1 shows a frame 6. The frame 6 has a sliding surface S of a thrust bearing portion J on which the end plate 4a of the orbiting scroll 4 slides, and an Oldham ring 8 interposed between the frame 6 and the orbiting scroll 4 is mounted on the outer periphery thereof. is there. At the center of the frame 6, there is provided a turning volume 16 for receiving the boss B of the turning scroll 4, and an annular oil groove 15 is formed around the turning volume 16. Outside the oil groove 15, a pair of key grooves 17 of the Oldham ring 8 are provided in the diameter direction.

The thrust bearing portion J of the frame
Of the orbiting scroll 4 in the direction of rotation of the orbiting scroll 4 from the oil groove 15 to each of the key grooves 17.
Another oil groove 23 (communication passage) extending linearly along the tangent line 5 and communicating the two is provided. The oil groove 23 is not limited to the oil groove 23 along the tangent line of the oil groove 15 but may be a curved one as long as the direction of rotation of the orbiting scroll 4 is the same.

According to the first embodiment having the frame 6, even when the Oldham ring 8 is in a non-lubricated state due to a long-term stop, the frame 6 with which the orbiting scroll 4 slides when subsequently started up. When lubricating oil is supplied to the oil groove 15 on the sliding surface S of the thrust bearing portion J, the oil groove 1
The lubricating oil in 5 is sent out and supplied to the key groove 17 through the oil groove 23 instantaneously. In other words, the lubricating oil in the oil groove 15 is pushed outward along the arrow in FIG. 1 by the orbiting motion of the orbiting scroll 4, so that it is quickly supplied from the oil groove 23 to the key groove 17. At this time, since the oil groove 23 extends in the tangential direction of the oil groove 15, the lubricating oil pushed out from the oil groove 15 is supplied with a small resistance, so that the supply of the lubricating oil to the key groove 17 is further smooth. Become.

Therefore, when the engine is started after a long-term stop, the oil supply time to the Oldham ring 8 in a non-lubricated state can be greatly reduced as compared with the conventional case. Seizure can be prevented, and reliability can be improved. The oil groove 2
3, the steady-state oil supply amount increases only slightly, so that the shape of the oil groove 23 and the diameter of the oil return pipe 22 are adjusted,
It is possible to achieve both shortening of the lubrication time at the time of starting and suppression of the amount of lubricating oil circulating during the steady state.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 shows a frame 25 which is a main part of the second embodiment. The drive bush 2 for driving the orbiting scroll 4 is provided at the center of the sliding surface S of the thrust bearing portion J with which the orbiting scroll 4 slides.
0 is provided together with the boss portion B of the orbiting scroll 4, and a key groove 17 of the Oldham ring 8 is provided on the outer periphery of the sliding surface S.
An oil groove 15 is provided around the swirl volume 16. And, on the sliding surface S of the thrust bearing portion J,
Another oil groove 26 intersecting with the oil groove 15 from the orbiting volume section 16 and extending toward each of the key grooves 17 and extending linearly along the tangent line of the outer periphery of the orbiting volume section 16 in the rotation direction of the orbiting scroll 4. Communication passage) is provided. The oil groove 26 is not limited to the oil groove 26 extending along the tangent of the orbiting volume 16, but may be a curved one as long as the orbiting scroll 4 rotates.

According to the second embodiment including the frame 25, even when the Oldham ring 8 is in a non-lubricated state for a long term stop, the lubricating oil is stored in the swirling volume 16 when the Oldham ring 8 is started thereafter. If refueling, this swirling volume 1
The lubricating oil in 6 is pushed out and supplied to each key groove 17 through the oil groove 26 instantaneously. Also in this embodiment, since the oil groove 26 extends along the tangential direction of the outer periphery of the swirl volume 16, the lubricating oil sent from the swirl volume 16 is supplied with a small resistance, so that the key groove 1 is further increased.
The supply of lubricating oil to 7 becomes smooth.

Therefore, when the engine is started after a long-term stop, the lubricating time up to the Oldham ring 8 in a non-lubricated state can be greatly reduced as compared with the conventional case, and the conventional problem of the Oldham ring 8 and the key groove 17 can be reduced. Seizure can be prevented, and reliability can be improved. The oil groove 2
6 increases the steady-state oil supply amount, but by adjusting the shape of the oil groove 26 and the pipe diameter of the oil return pipe 22, it is possible to reduce the oil supply time at the start-up and to suppress the lubricating oil circulation amount at the steady state. Can be compatible.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 3 shows a frame 28 which is a main part of the third embodiment. The frame 28 is provided with a drive bush 2 for driving the orbiting scroll 4 at the center of the sliding surface S of the thrust bearing portion J with which the orbiting scroll 4 slides.
0 is provided together with the boss portion B of the orbiting scroll 4, and a key groove 17 of the Oldham ring 8 is provided on the outer periphery of the sliding surface S.
An oil groove 15 is provided around the swirl volume 16. An oil communication hole 29 is provided from the swirl volume 16 to each of the key grooves 17 so as to penetrate the frame 28. Here, the oil communication hole 29 is provided in the swirl volume section 16.
Are formed along the tangential direction and toward the turning direction of the orbiting scroll 4. Note that the oil communication passage 29 is not limited to the one along the tangent line of the orbiting volume section 16, and the orbiting scroll 4
May be curved as long as the rotation direction is.

According to the third embodiment having the frame 28, even when the Oldham ring 8 is in a non-lubricated state for a long term stop, the lubricating oil is stored in the swirl volume 16 when the Oldham ring 8 is started thereafter. If refueling, this swirling volume 1
The lubricating oil inside 6 is sent outward by the orbiting motion of the boss portion B of the orbiting scroll 4 and passes through the oil communication hole 29 to the keyway 1.
7 instantaneously.

Therefore, when the engine is started after a long-term stop, the lubricating time to the Oldham ring 8 in a non-lubricated state can be significantly reduced as compared with the conventional case. Seizure can be prevented, and reliability can be improved. Further, the steady-state oil supply amount increases due to the oil communication hole 29, but the oil communication hole 29 increases.
By adjusting the shape (hole diameter) and the diameter of the oil return pipe 22, it is possible to achieve both a reduction in the lubrication time at the time of startup and a suppression of the amount of lubricating oil circulating in a steady state. In the third embodiment as well, since the oil communication hole 29 is provided in the turning direction of the orbiting scroll 4 and in the tangential direction of the outer periphery of the orbiting volume 16, the oil communication hole 29 is formed in the boss portion B of the orbiting scroll 4. The lubricating oil is smoothly supplied by the turning operation without any resistance.

Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 shows the orbiting scroll 31, the frame 6, and the like, which are essential parts of the fourth embodiment. The key groove 17 of the Oldham ring 8 is provided on the outer periphery of the sliding surface S of the thrust bearing portion J of the frame 6, and is a sliding contact surface of the end plate 31 a of the orbiting scroll 31 slidably contacting the sliding surface S. In the vicinity of each key groove 17 of the portion J, the recess 3 for the oil sump is provided.
2 are provided. According to the fourth embodiment including the orbiting scroll 31, even if the Oldham ring 8 is in a non-lubricated state after a long-term stop, when the Oldham ring 8 is subsequently started, the recess 32 formed in the end plate 31 a of the orbiting scroll 31 is not removed. When the lubricating oil is supplied, the lubricating oil is sent out by the orbiting motion of the orbiting scroll 31, so that each of the keyways 17
Can be refueled instantaneously.

Therefore, when the engine is started after a long-term stop, the oiling time up to the Oldham ring 8 in the non-lubricated state can be shortened as compared with the conventional case, so that the seizure of the Oldham ring 8 and the key groove 17 which is a conventional problem can be prevented. Prevention and reliability can be improved. The recess 32 slightly increases the amount of lubricating oil in a steady state. However, by adjusting the shape of the recess 32 and the diameter of the oil return pipe 22, it is possible to shorten the lubricating time at startup and to circulate the lubricating oil in a steady state. Both suppression of the amount can be achieved.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 5 shows the orbiting scroll 34 and the frame 6 which are essential parts of the fifth embodiment. At the center of the sliding surface S of the thrust bearing portion J with which the end plate 34a of the orbiting scroll 34 slides, the orbiting scroll 34
Is provided with a swivel volume 16 that receives the boss B and allows the boss B to swivel. A key groove 17 of the Oldham ring 8 is provided on the outer periphery of the sliding surface S, and a recess 35 for oil sump is provided on a sliding contact surface of the end plate 34a of the orbiting scroll 34.

The recess 35 opens in the peripheral wall of the orbiting scroll 34 and is provided in the direction in which the key groove 17 is provided. Volume 16 or keyway 17
Is configured to be able to communicate with at least one of them. That is, when the orbiting scroll 34 performs the orbiting motion, the stroke in the direction in which the key groove 17 of the orbiting scroll 34 is arranged communicates with the orbiting volume 16 at one stroke end as shown in FIG. At the end, as shown in FIG. 7, the length is set to be long enough to communicate with the key groove 17.

According to the fifth embodiment provided with the orbiting scroll 34, even if the Oldham ring 8 is in a non-lubricated state due to a long-term stop, the orbiting scroll 34 will not be
When lubricating oil is supplied to the concave portion 35 formed in the end plate 34a, the oil can be supplied to the Oldham ring 8 instantaneously by the orbiting motion of the orbiting scroll 34. That is, the orbiting scroll 34 that makes a revolving motion in the left-right direction in FIGS. 6 and 7 makes a reciprocating motion, but in this reciprocating motion, at one stroke end shown in FIG.
4 communicates with the orbiting volume 16, so that lubricating oil is supplied from the orbiting volume 16. At the other stroke end shown in FIG. 7, the orbiting recess 35 of the orbiting scroll 34 communicates with the key groove 17. The lubricating oil stored in 35 can be quickly supplied to the key groove 17.

Therefore, when the engine is started after a long-term stop, the oiling time up to the Oldham ring 8 in a non-lubricated state can be shortened as compared with the conventional case. Prevention and reliability can be improved. The recess 32 slightly increases the amount of lubrication during normal operation. However, by adjusting the shape of the recess 35 and the diameter of the oil return pipe 22, it is possible to shorten the lubrication time during startup and to circulate the lubricating oil during steady operation. Both suppression of the amount can be achieved. The present invention is not limited to the above-described embodiment. For example, instead of providing the oil groove 15, or together with the oil groove 15, a closed oil groove can be provided in the orbiting scroll.

[0036]

As described above, according to the first aspect of the present invention, even when the lubricating oil is supplied to the oil groove even at the time of starting after a long-term stop, the lubricating oil is quickly transmitted to the communication passage. Is supplied to the key groove of the Oldham ring, and the lubrication of the Oldham ring can be quickly performed. Therefore, there is an effect that seizure in the key groove of the Oldham ring can be prevented.

According to the second aspect of the present invention, when the lubricating oil is supplied to the oil groove even at the time of starting after a long-term stop,
This lubricating oil is urged by the orbiting motion of the orbiting scroll and is quickly supplied to the key groove of the Oldham ring through another oil groove on the sliding surface of the thrust bearing portion, so that the Oldham ring can be quickly lubricated. There is an effect that seizure in the keyway of the Oldham ring can be prevented.

According to the third aspect of the present invention, when lubricating oil is supplied to the orbiting volume even at the time of startup after a long-term stop, the lubricating oil is urged by the orbiting motion of the orbiting scroll and the thrust bearing portion is rotated. The oil is quickly supplied to the key groove of the Oldham ring through another oil groove on the sliding surface, and the Oldham ring can be quickly lubricated. Therefore, the effect of preventing seizure in the key groove of the Oldham ring is obtained. is there.

According to the fourth aspect of the present invention, when lubricating oil is supplied to the orbiting volume even during startup after a long-term stop, the lubricating oil is prompted by the orbiting motion of the boss of the orbiting scroll to orbit. The oil is quickly supplied to the Oldham ring from the volume through the oil communication hole, and the Oldham ring can be quickly lubricated. Therefore, there is an effect that seizure in the key groove of the Oldham ring can be prevented.

According to the invention, when lubricating oil is supplied to the concave portion of the end plate of the orbiting scroll even at the time of startup after a long-term stop, the lubricating oil is urged by the orbiting motion of the orbiting scroll. Since it is quickly supplied to the key groove of the Oldham ring from the concave portion and the lubrication of the Oldham ring can be performed quickly, there is an effect that seizure in the key groove of the Oldham ring can be prevented.

According to the invention, when lubricating oil is supplied to the concave portion of the end plate of the orbiting scroll even at the time of startup after a long-term stop, the lubricating oil promotes the orbiting movement of the orbiting scroll. As a result, the lubrication of the Oldham ring can be performed quickly by being supplied from the concave portion to the key groove of the thrust bearing portion, so that seizure in the key groove of the Oldham ring can be prevented. Further, since the concave portion is configured to be able to communicate with at least one of the orbiting volume portion and the key groove in accordance with the orbiting movement of the orbiting scroll, lubricating oil is quickly supplied from the orbiting volume portion to the concave portion, and this lubricating oil is supplied. Since the key groove can be quickly supplied from the concave portion to the key groove, the sticking of the Oldham ring can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a first embodiment of the present invention.

FIG. 2 is a plan view of a main part of a second embodiment of the present invention.

FIG. 3 is a plan view of a main part of a third embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a fifth embodiment of the present invention.

FIG. 6 is an operation explanatory view of a fifth embodiment of the present invention.

FIG. 7 is an operation explanatory view of a fifth embodiment of the present invention.

FIG. 8 is an overall sectional explanatory view of a conventional technique and an embodiment of the present invention.

FIG. 9 is a plan view of a prior art frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body housing (sealed housing) 4,31,34 Orbiting scroll 5 Fixed scroll 8 Oldham ring 15 Oil groove 16 Turning volume 17 Keyway 20 Drive bush 23,26 Other oil grooves (communication passages) 29 Oil communication holes 31a, 34a End plate 32, 35 recess B boss J thrust bearing S sliding surface

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H039 AA03 AA04 AA12 BB11 BB12 BB25 CC09 CC13 CC16 CC22 CC27

Claims (6)

[Claims] In a scroll-type fluid machine having a closed housing, a revolving scroll and a fixed scroll provided in the closed housing so as to be revolvable with each other, an oil is applied to a sliding surface of a thrust bearing portion with which the revolving scroll slides. A scroll-type fluid machine comprising a groove, a key groove of an Oldham ring provided outside the sliding surface, and a communication path provided from the oil groove to the key groove. 2. A scroll-type fluid machine having a closed housing, a revolving scroll and a fixed scroll provided in the closed housing so as to be revolvable with each other, and a ring surface is formed on a sliding surface of a thrust bearing portion with which the revolving scroll slides. The oil groove is provided and a key groove of the Oldham ring is provided outside the sliding surface, and the sliding surface of the thrust bearing portion is provided with:
A scroll-type fluid machine provided with another oil groove extending from the oil groove to the key groove and extending linearly or curvedly in the rotation direction of the orbiting scroll along a tangent to the oil groove. . 3. A scroll type fluid machine having a closed housing, a revolving scroll and a fixed scroll provided rotatably within the closed housing, and a center of a sliding surface of a thrust bearing portion with which the revolving scroll slides. A swivel volume portion for accommodating a drive bush for driving the orbiting scroll is provided in the portion, and a key groove of the Oldham ring is provided outside the sliding surface, and a sliding surface of the thrust bearing portion is provided from the swivel volume portion. A scroll type fluid machine further comprising another oil groove facing the key groove and extending linearly or curvedly in a rotational direction of the orbiting scroll and along a tangent to the outer periphery of the orbiting volume. 4. In a scroll-type fluid machine having a closed housing, a revolving scroll and a fixed scroll rotatably provided in the closed housing, a center of a sliding surface of a thrust bearing portion with which the revolving scroll slides. A swivel volume portion that receives the boss portion of the orbiting scroll and allows the orbital movement of the boss portion, and a key groove of an Oldham ring is provided outside the sliding surface, and the swivel volume portion extends from the swivel volume portion to the key groove. A scroll-type fluid machine having an oil communication hole penetrating therethrough. 5. In a scroll-type fluid machine having a closed housing, a revolving scroll and a fixed scroll provided in the closed housing so as to be revolvable with each other, sliding of a thrust bearing portion with which an end plate of the revolving scroll is in sliding contact. A scroll groove provided with a key groove of an Oldham ring outside a surface thereof, and a recess for an oil reservoir provided near a key groove of a thrust bearing portion on a sliding contact surface of an end plate of the orbiting scroll. machine. 6. In a scroll type fluid machine having a closed housing, a revolving scroll and a fixed scroll provided in the closed housing so as to be revolvable with each other, sliding of a thrust bearing portion with which an end plate of the revolving scroll slides. An end plate of the orbiting scroll provided at a center portion of the surface thereof, a turning volume portion for receiving a boss portion of the orbiting scroll and permitting the turning motion of the boss portion, and a keyway of an Oldham ring provided outside the sliding surface; A concave portion for oil reservoir is provided near the key groove of the thrust bearing portion, and the concave portion can communicate with at least one of the revolving volume portion and the key groove along with the revolving motion of the revolving scroll. A scroll type fluid machine characterized by being performed.