JPH1130188A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the quantity of lubricating oil so as to be able to sufficiently lubricate a lip seal by providing an inner end large diameter part of a rotary shaft protrusively provided with an eccentric driving pin so as to revolve a turning scroll, with an oil feed hole piercingly bored inclining in such a way as to be gradually enlarged inward from the outside. SOLUTION: A turning scroll 14 is driven by the rotation of a rotary shaft 7 through turning drive mechanism and put in revolving motion while its rotation is impeded by an Oldham's link 26. In such a scroll type compressor, an inner end large diameter part 7a of the rotary shaft 7 is piercingly provided with an oil feed hole 38 bored inclining in such a way as to be gradually enlarged inward from the outside, and its inner end opening is communication with a slide groove 24. During operation of the scroll type compressor, gas in a chamber 34 is forcibly fed into the slide groove 24 from the oil feed hole 38 by the rotation of the rotary shaft 7 and then made to flow out through the inside of the slide groove 24, a chamber 40 limited to an inner part of a boss 20, and a clearance of a turning bearing 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll compressor mounted on an air conditioner or the like.

[0002]

2. Description of the Related Art An example of a conventional scroll compressor is shown in FIG.
Is shown in Reference numeral 1 denotes a housing, which comprises a cup-shaped main body 2 and a front housing 6 fastened to the main body by bolts (not shown). The rotating shaft 7 penetrates the front housing 6, and the large-diameter portion 7 a at the inner end is supported by a main bearing 9, and the outer end is supported by a bearing 8. The gap between the rotary shaft 7 and the front housing 6 is sealed by a lip seal 35 outside the main bearing 9.

A fixed scroll 10 is provided inside a housing 1.
And an orbiting scroll 14 are provided. The fixed scroll 10 includes an end plate 11 and a spiral wrap 12 erected on the inner surface of the end plate 11, and the end plate 11 is fastened to the cup-shaped main body 2 by bolts 13. The inside of the housing 1 is partitioned by bringing the outer peripheral surface of the end plate 11 into close contact with the inner peripheral surface of the cup-shaped body 2, the discharge cavity 31 is limited outside the end plate 11, and the suction chamber is inside the end plate 11. 28 are limited.

A discharge port 29 is formed in the center of the end plate 11, and the discharge port 29 is opened and closed by a discharge valve 30. The lift of the discharge valve 30 is regulated by a valve retainer 32. One end of the discharge valve 30 and one end of the valve retainer 32 is
Has been concluded.

The orbiting scroll 14 includes an end plate 15 and a spiral wrap 16 erected on the inner surface thereof. The spiral wrap 16 has substantially the same shape as the spiral wrap 12 of the fixed scroll 10. have. The orbiting scroll 14 and the fixed scroll 10 are mutually eccentric by a predetermined distance, and
The phases are shifted only by one another as shown in the figure.

[0006] Thus, the tip seal 17 embedded on the distal end surface of the spiral wrap 12 is in close contact with the inner surface of the end plate 15, and the tip seal 18 embedded on the distal end surface of the spiral wrap 16 is A plurality of compression chambers 19a and 19b which are in close contact with the inner surface and which are in line contact with the side surfaces of the spiral wraps 12 and 16 at a plurality of locations and which are substantially point-symmetric with respect to the center of the spiral are formed.

A drive bush 21 is rotatably fitted via a swivel bearing 23 inside a cylindrical boss 20 projecting from the center of the outer surface of the end plate 15, and is formed in the drive bush 21. An eccentric drive pin 25 projecting eccentrically from the inner end face of the inner end large diameter portion 7a of the rotary shaft 7 is slidably fitted in the slide groove 24.

A thrust bearing 36 and an Oldham link 26 are interposed between the outer peripheral edge of the outer surface of the end plate 15 and the inner end surface of the front housing 6 to balance the dynamic imbalance due to the revolving orbiting motion of the orbiting scroll 14. Therefore, a balance weight 27 is fixed to the drive bush 21, and a balance weight 37 is fixed to the rotating shaft 7.

When the rotary shaft 7 is rotated, the orbiting scroll 14 is driven via a orbiting drive mechanism including the eccentric drive pin 25, the slide groove 24, the drive bush 21, the orbital bearing 23, the boss 20, and the like. The scroll 14 revolves in a circular orbit having a revolving radius as a radius while its rotation is prevented by the Oldham link 26.

Then, the line contact portions on the side surfaces of the spiral wraps 12 and 16 gradually move toward the center of the spiral, and as a result,
The compression chambers 19a and 19b move toward the center of the spiral while reducing their volumes. Along with this, the gas flowing into the suction chamber 28 through the suction passage 37 is taken into the compression chambers 19a and 19b from the outer terminal openings of the spiral wraps 12 and 16, and is compressed while being taken into the central chamber 22. And discharge port 29 from here
Then, the discharge valve 30 is pushed open and discharged to the discharge cavity 31, from which it flows out through a discharge port (not shown).

[0011]

In the above scroll type compressor, the mist-like oil contained in the gas sucked into the suction chamber 28 from the suction passage 37 causes the bearing 8, 8
Although the main bearing 9, the lip seal 35, the drive bush 21 and the slewing bearing 23 are lubricated, the amount of gas entering the chamber 34 in front of the gap through the gap of the main bearing 9 is small, so that the lip seal 35 is sufficiently There was a problem that lubrication was not possible.

Also, since the inside of the boss 20 is a dead end, there is a problem that the sliding bearing 23 and the sliding portion between the eccentric drive pin 25 and the slide groove 24 cannot be sufficiently lubricated.

Further, when the scroll compressor is stopped for a long time, the lubricating oil in the key groove 41 is washed away by the liquid refrigerant flowing into the housing 1 through the suction passage 37, so that when the scroll compressor is restarted, Poor lubrication between the key groove 41 and the turning key 26a of the Oldham link 26 may cause abnormal wear, galling, seizure and the like.

[0014]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the first invention is that a fixed scroll and an orbiting scroll are mutually eccentric in a housing. The housing and the rotating shaft are disposed outside the main bearing that rotatably supports the inner end large-diameter portion of the rotating shaft that penetrates the housing and rotatably supports the housing. A lip seal that seals the gap is arranged, and a drive bush is rotatably fitted via a revolving bearing inside a boss protruding from the center of the outer surface of the end plate of the orbiting scroll. An eccentric drive pin eccentrically protruded from the inner end surface of the inner end large-diameter portion is slidably fitted into the provided slide groove, and the mist-like oil contained in the gas sucked into the housing is slidably fitted. Yo In the scroll compressor for lubricating the main bearing, the lip seal, the drive bush, and the orbit bearing, the rotary shaft is formed so as to gradually expand from the outside toward the inside through the large-diameter portion at the inner end of the rotating shaft. The scroll type compressor is characterized in that an inclined oil supply hole is formed.

Another feature is that the inner end opening of the oil supply hole communicates with the slide groove.

The gist of the second invention resides in that the fixed scroll and the orbiting scroll are eccentric to each other, are displaced in phase and are meshed with each other, and are disposed in a horizontal housing. A boss is protrudingly provided at the center of the outer surface of the boss, and a key groove in which the revolving side key of the Oldham link is slidably fitted is formed substantially vertically in the outer peripheral side of the boss. The drive bush is rotatably fitted through the drive bush, and the eccentric drive pin projecting eccentrically from the inner end of the rotating shaft extending horizontally into the slide groove formed in the drive bush is slidably fitted. And in a scroll type compressor in which gas is sucked into the housing from above the Oldham link,
An oil supply hole penetrating through the base of the boss and opening into the key groove is provided in the scroll type compressor.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG. A lubrication hole is formed in the large-diameter portion 7a at the inner end of the rotating shaft 7 so as to penetrate the inner portion from the outside toward the inside, that is, to gradually expand as it goes toward the inner end along the rotating shaft 7. An inner end opening of the oil supply hole 38 communicates with the slide groove 24. The other configuration is the same as that of the conventional one shown in FIG. 3, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

Thus, during operation of the scroll compressor,
The gas in the chamber 34 is sucked into the oil supply hole 38 by the rotation of the rotating shaft 7, and is urged in the process of flowing through the oil supply hole 38 to be forcibly sent into the slide groove 24. And the slide groove
Through the inside of the boss 20, it flows out through the gap of the slewing bearing 23 through the chamber 40 limited to the inner part of the boss 20.

Thus, since the amount of gas flowing into the chamber 34 through the gap of the main bearing 9 increases, the amount of lubricating oil entering the chamber 34 accompanying this gas increases, and accordingly, the lip seal 35 Can be sufficiently lubricated.

The gas urged by flowing through the oil supply hole 38 flows through the slide groove 24, the chamber 40 and the swivel bearing 23.
The sliding part between the eccentric drive pin 25 and the eccentric drive pin 25 and the slewing bearing 23 can be effectively lubricated.

A second embodiment of the present invention is shown in FIG. In the second embodiment, a lubrication hole 39 that penetrates the base of the boss 20 and opens to the key groove 41 is formed in the base. Other configurations are the same as those of the first embodiment shown in FIG. 1, and corresponding members are denoted by the same reference numerals and description thereof will be omitted.

When the scroll compressor is restarted after being stopped for a long time, the gas in the chamber 34 is sucked into the oil supply hole 38 by the rotation of the rotary shaft 7, and the gas flows through the oil supply hole 38. And is forcibly fed into the slide groove 24. Then, it passes through the slide groove 24 and enters the chamber 40 limited to the inner part of the boss 20, and the orbital movement of the chamber 40 causes the chamber 40 to rotate.
After the gas inside is urged, a part of the gas flows out through the gap of the slewing bearing 23, but the remainder flows out to the key groove 41 through the oil supply hole 39.

Thus, the gas containing the mist enters the key groove 41 through the oil supply hole 39, so that the sliding portion between the key groove 41 and the turning-side key 26a of the Oldham link 26 fitted therein is forcibly lubricated. it can.

[0024]

According to the first aspect of the present invention,
An oil supply hole that penetrates the large-diameter portion of the inner end of the rotating shaft and penetrates from the outside toward the inside is formed so that gas is urged by the oil supply hole when the rotating shaft rotates. Can increase the amount of gas passing through the gap in the main bearing and into the chamber outside it, thereby effectively lubricating the lip seals located outside the main bearing. it can.

If the inner end opening of the oil supply hole is communicated with the slide groove, the gas urged by flowing through the oil supply hole passes through the slide groove and the swivel bearing. The sliding surface between the shaft and the eccentric drive pin fitted thereto and the slewing bearing can be effectively lubricated.

According to the second aspect of the present invention, since the lubrication hole is formed in the base of the boss so as to penetrate the base and open to the key groove, the lubrication hole is formed in the inner part of the boss when the orbiting scroll revolves. The gas inside the chamber is urged and flows out through the oil supply hole into the key groove, so that the sliding surface between the key groove and the turning-side key of the Oldham link fitted into the key groove is lubricated with oil contained in the gas. Therefore, when restarting after a long stoppage, poor lubrication of these sliding surfaces and abnormal wear, galling and seizure due to the poor lubrication can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 10 Fixed scroll 14 Orbiting scroll 15 End plate 20 Boss 7 Rotating shaft 7a Inner end large diameter part 25 Eccentric drive pin 9 Main bearing 35 Lip seal 21 Drive bush 23 Slewing bearing 24 Slide groove 38 Oiling hole

Claims (3)

[Claims] 1. A fixed scroll and an orbiting scroll are eccentric to each other, and are arranged in a phase-shifted manner in a housing, and a large-diameter portion at the inner end of a rotary shaft passing through the housing is rotated by the housing. A lip seal that seals a gap between the housing and the rotating shaft is arranged outside the main bearing that freely supports the shaft, and the drive bush is swung inside a boss protruding from the center of the outer surface of the end plate of the orbiting scroll. An eccentric drive pin eccentrically projecting from the inner end surface of the inner end large diameter portion is slidably fitted into a slide groove formed in the drive bush so as to be rotatable via a bearing. A scroll compressor that lubricates the main bearing, the lip seal, the drive bush and the orbit bearing with mist-like oil contained in the gas sucked into the housing. Scroll compressor, characterized in that bored oil supply hole extending through it to the inner end large diameter portion of the shaft is inclined so as to gradually widened toward the outside inward. 2. The scroll compressor according to claim 1, wherein an inner end opening of the oil supply hole communicates with the slide groove. 3. The fixed scroll and the orbiting scroll are eccentric to each other, and are arranged out of phase with each other in a horizontal housing. A boss protrudes from the center of the outer surface of the end plate of the orbiting scroll. At the same time, a key groove in which the turning key of the Oldham link is slidably fitted is formed in the outer peripheral side of the boss in a substantially vertical direction, and the drive bush is rotatable inside the boss via a turning bearing. An eccentric drive pin eccentrically projecting from the inner end of a rotating shaft extending horizontally into a slide groove formed in the drive bush is slidably fitted to the drive bush. Wherein the oil supply hole is formed in the base of the boss, and an oil supply hole is formed in the base of the boss so as to open to the key groove. Machine.