JP2560698Y2 - Scroll type fluid machine - Google Patents

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.

[0002]

2. Description of the Related Art FIG. 2 is a longitudinal sectional view of a conventional scroll compressor. In FIG. 1, reference numeral 1 denotes a closed housing, which comprises a cup-shaped main body 2, a front end plate 4 fastened to the body 3 by bolts 3, and a cylindrical member 6 fastened to the front end plate 4 by bolts 5. A rotating shaft 7 penetrating the cylindrical member 6 is rotatably supported by the housing 1 via bearings 8 and 9. A fixed scroll 10 and an orbiting scroll 14 are provided in the housing 1.

The fixed scroll 10 has an end plate 11 and a spiral wrap 12 erected on the inner surface thereof.
1 is fastened to the cup-shaped main body 2 by bolts 13. 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, and a discharge cavity 31 is formed outside the end plate 11.
The suction chamber 28 is limited inside 1. 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 orbiting scroll 14 has an end plate 15 and a spiral wrap 16 erected on its inner surface, and the spiral wrap 16 has substantially the same shape as the spiral wrap 12 of the fixed scroll 10. ing.

The orbiting scroll 14 and the fixed scroll 10
Are eccentric by a predetermined distance from each other, and are displaced by an angle of 180 ° and engaged with each other as shown in the figure. Thus,
The tip seal 17 buried in the tip end surface of the spiral wrap 12 is in close contact with the bottom surface of the end plate 15, and the tip seal 18 buried in the tip end surface of the spiral wrap 16 is in close contact with the inner surface of the end plate 11, The side surfaces of the spiral wraps 12 and 16 are in line contact with each other at a plurality of places to form a plurality of compression chambers 19a and 19b which are substantially point-symmetric with respect to the center of the spiral.

A drive bush 21 is provided inside a cylindrical boss 20 projecting from the center of the outer surface of the end plate 15.
An eccentric drive pin 25 eccentrically protruding from the inner end of the rotary shaft 7 is slidably fitted in a slide groove 24 formed in the drive bush 21 through the drive bush 21. ing. And this drive bush 21
The balance weight 27 for equilibrating the dynamic imbalance due to the revolving orbiting motion of the orbiting scroll is attached to.

The slewing bearing 23 is press-fitted into a hole at the center of the cylindrical boss 20 at a low pressure, and is caulked to the opening side so as to prevent the slewing bearing 23 from protruding.

Between the outer peripheral edge of the outer surface of the end plate 15 and the inner surface of the front end plate 4, a rotation preventing mechanism 26 comprising a thrust bearing 36 and an Oldham joint is interposed.
In addition, 37 is a balance weight fixed to the rotating shaft 7.

When the rotating shaft 7 is rotated, the eccentric drive pin 2
5. The orbiting scroll 14 is driven via a orbiting drive mechanism including a drive bush 21, a boss 20, and the like. The orbiting scroll 14 revolves on a circular orbit having a revolving orbital radius while being prevented from rotating by the Oldham joint 26. Make a swirling motion. 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. Accordingly, gas flowing into the suction chamber 28 through a suction port (not shown) flows from the outer end openings of the spiral wraps 12 and 16 to the compression chambers 19a, 1a.
It is taken into the inside 9b and is compressed and reaches the central chamber 22. From here, it passes through the discharge port 29, pushes and opens the discharge valve 30, and is discharged into the discharge cavity 31, from which it flows out through the discharge port (not shown).

[0009]

In the conventional scroll type compressor described above, the orbiting bearing 23 is fixed to the cylindrical boss 20 during normal operation, but the cylindrical boss 20 is fixed by gas-low operation or overload operation. When the temperature rises, the pressure input to the mounting surface 101 decreases due to the difference in thermal expansion, and the outer ring of the slewing bearing 23 causes creep. When creep occurs, the mounting surface 101 of the cylindrical boss 20 and the slewing bearing 23 is worn, which may cause problems such as flaking of the slewing bearing 23. In addition, swaging for preventing the swing bearing 23 from jumping out is not appropriate, and the swing bearing 23 sometimes jumps out, causing a malfunction.

The present invention solves the above-mentioned disadvantages of the prior art, and even when the cylindrical boss thermally expands, the outer ring of the slewing bearing creeps, and the inner surface of the boss hole and the outer surface of the slewing bearing are worn or flaking occurs. To prevent the slewing bearing from jumping out.

[0011]

SUMMARY OF THE INVENTION The present invention has solved the above-mentioned problem, and has engaged a fixed scroll and an orbiting scroll, each of which has a spiral wrap standing on the inner surface of each end plate. Forming a plurality of pressure fluid chambers, the orbiting scroll revolving orbiting while preventing its rotation, in a scroll type fluid machine, the center of the cylindrical boss protruding from the center of the outer surface of the orbiting scroll end plate. The present invention relates to a scroll-type fluid machine in which an inner surface of a hole and an outer surface of an outer ring of a slewing bearing are fixed to each other by applying an adhesive.

[0012]

By fixing the cylindrical boss and the slewing bearing with an adhesive, even if the cylindrical boss expands due to a rise in temperature,
Slewing bearings do not creep or wear. Similarly, no protrusion of the slewing bearing occurs and the reliability is improved.

[0013]

1 is a longitudinal sectional view of one embodiment of the present invention.
In this embodiment, the outer surface of the outer ring of the slewing bearing 23 is bonded and fixed to the cylindrical boss 20 via an adhesive 102. The other parts are the same as in the prior art.

By fixing the cylindrical boss 20 and the slewing bearing 23 with an adhesive, the slewing bearing 23 does not creep even if the cylindrical boss 20 expands due to a rise in temperature.
No wear occurs. Similarly, the swing bearing 23 does not protrude, and the reliability of the compressor is improved.

[0015]

According to the scroll type fluid machine of the present invention, the inner surface of the hole at the center of the cylindrical boss protruding from the center of the outer surface of the orbiting scroll end plate and the outer surface of the outer ring of the orbit bearing are coated with an adhesive. Even if the cylindrical boss thermally expands, the outer ring of the slewing bearing may creep, causing the inner surface of the boss hole and the outer surface of the slewing bearing to wear or flaking even if the cylindrical boss thermally expands. Is prevented. Further, the swing bearing is prevented from jumping out.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a conventional scroll compressor.

[Explanation of symbols]

 Reference Signs List 20 cylindrical boss 23 slewing bearing 102 adhesive

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of pressurized fluid chambers are formed by meshing a fixed scroll and an orbiting scroll, each of which has a spiral wrap erected on the inner surface of each end plate, to rotate the orbiting scroll. In a scroll-type fluid machine that performs revolving orbiting while blocking, an adhesive is applied to the inner surface of the hole at the center of the cylindrical boss protruding from the center of the outer surface of the orbiting scroll end plate and the outer surface of the outer ring of the orbit bearing. A scroll-type fluid machine characterized by being fixedly attached to each other.