JPH0630487U - Scroll type fluid machinery - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the cylindrical boss in which the swivel bearing is fitted in the hole in the center part expands thermally, the outer ring of the swivel bearing creeps and the inner surface of the boss hole and the outer surface of the swivel bearing Prevents wear and flaking and prevents the slewing bearing from popping out. [Structure] An inner surface of a hole in a central portion of a cylindrical boss projecting at a central portion of an outer surface of an orbiting scroll end plate and an outer surface of an outer ring of an orbiting bearing are adhered to each other by applying an adhesive.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a scroll type fluid machine.

[0002]

[Prior art]

 FIG. 2 is a vertical sectional view of a conventional scroll compressor. In the figure, reference numeral 1 denotes a hermetic housing, which comprises a cup-shaped main body 2, a front end plate 4 fastened thereto with bolts 3, and a tubular member 6 fastened thereto with bolts 5. A rotary shaft 7 penetrating the tubular member 6 is rotatably supported by the housing 1 via bearings 8 and 9. A fixed scroll 10 and an orbiting scroll 14 are arranged in the housing 1.

The fixed scroll 10 includes an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11, and the end plate 11 is fastened to the cup-shaped body 2 by a bolt 13. The inside of the housing 1 is partitioned by bringing the outer peripheral surface of the end plate 11 and the inner peripheral surface of the cup-shaped body 2 into close contact with each other, a discharge cavity 31 is formed outside the end plate 11, and inside the end plate 11 is formed. The suction chamber 28 is 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 orbiting scroll 14 includes an end plate 15 and a spiral wrap 16 provided upright on the inner surface thereof, 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 with respect to each other by a predetermined distance, and are meshed with each other with an angle of 180 °. Thus, the tip seal 17 embedded in the tip surface of the spiral wrap 12 is in close contact with the bottom surface of the end plate 15, and the tip seal 18 embedded in the tip surface of the spiral wrap 16 is in the inner surface of the end plate 11. The side surfaces of the spiral wraps 12 and 16 are in close contact with each other, and a plurality of compression chambers 19a and 19b are formed which are in line contact with each other at a plurality of points and are substantially point-symmetric with respect to the center of the spiral.

A drive bush 21 is rotatably fitted into a cylindrical boss 20 projecting from the central portion of the outer surface of the end plate 15 through a swivel bearing 23, and the drive bush 21 is bored in the drive bush 21. An eccentric drive pin 25, which is eccentrically provided on the inner end of the rotary shaft 7, is slidably fitted in the slide groove 24. A balance weight 27 is mounted on the drive bush 21 to balance the dynamic unbalance caused by the orbiting motion of the orbiting scroll.

The slewing bearing 23 is press-fitted into a hole at the center of the cylindrical boss 20, and is caulked on the opening side so that the slewing bearing 23 is fixed so as not to pop out.

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 including a thrust bearing 36 and an Oldham's joint is interposed. Incidentally, 37 is a balance weight fixed to the rotary shaft 7.

When the rotary shaft 7 is rotated, the orbiting scroll 14 is driven via an orbiting drive mechanism including an eccentric drive pin 25, a drive bush 21, a boss 20, etc., and the orbiting scroll 14 is moved by an Oldham coupling 26. While being prevented from rotating, it makes a revolution revolving motion on a circular orbit whose radius is the revolution revolution radius. 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 port (not shown) is taken into the compression chambers 19a and 19b from the outer end openings of the spiral wraps 12 and 16 and is compressed. To the chamber 22, from which the discharge valve 30 is pushed open to be discharged into the discharge cavity 31, and then discharged from there through a discharge port (not shown).

[0009]

[Problems to be solved by the device]

 In the conventional scroll compressor described above, the orbiting bearing 23 is fixed to the cylindrical boss 20 during normal operation, but when the temperature of the cylindrical boss 20 rises due to gas low operation, overload operation, or the like, thermal expansion of the cylindrical boss 20 is prevented. Due to the difference, the pressure input to the mounting surface 101 is reduced, and the outer ring of the slewing bearing 23 creeps. When creep occurs, the mounting surface 101 of the cylindrical boss 20 and the orbiting bearing 23 may be worn, which may cause a problem such as flaking of the orbiting bearing 23. Further, the swaging for preventing the swivel bearing 23 from popping out was not appropriate, and the swivel bearing 23 sometimes failed to pop out.

The present invention solves the above-mentioned drawbacks of the prior art, and even if 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 popping out.

[0011]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problems, and a plurality of pressure fluid chambers are formed by engaging a fixed scroll and an orbiting scroll, which are formed by vertically arranging spiral wraps on the inner surface of each end plate. In a scroll-type fluid machine that is formed to orbit the orbiting scroll in a revolving orbit while blocking its rotation, the orbit and the inner surface of the hole in 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 characterized in that an adhesive is applied to the outer surface of the outer ring of the bearing to fix them to each other.

[0012]

[Action]

 By fixing the cylindrical boss and the slewing bearing with an adhesive, even if the temperature of the cylindrical boss expands and expands, the slewing bearing does not creep and does not wear. Similarly, the slewing bearing does not pop out and reliability is improved.

[0013]

【Example】

 FIG. 1 is a vertical sectional view of an embodiment of the present invention. In the present embodiment, the outer surface of the outer ring of the slewing bearing 23 is adhesively fixed to the cylindrical boss 20 with an adhesive 102. The parts other than the above 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 and does not wear even if the cylindrical boss 20 expands due to temperature rise. Similarly, the slewing bearing 23 does not pop out, and the reliability of the compressor is improved.

[0015]

[Effect of device]

 In the scroll-type fluid machine of the present invention, the inner surface of the hole in the center of the cylindrical boss projecting from the outer surface of the end plate of the orbiting scroll and the outer surface of the outer ring of the orbiting bearing are coated with an adhesive agent to each other. Even if the cylindrical boss thermally expands, the outer ring of the slewing bearing is prevented from creeping and the inner surface of the boss hole and the outer surface of the slewing bearing from being worn or flaking. Also, the slewing bearing is prevented from popping out.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a conventional scroll compressor.

[Explanation of symbols]

 20 Cylindrical boss 23 Slewing bearing 102 Adhesive

Claims (1)

[Scope of utility model registration request] 1. A plurality of pressure fluid chambers are formed by meshing a fixed scroll and an orbiting scroll, which are formed by vertically arranging a spiral wrap on the inner surface of each end plate, and the orbiting scroll is rotated about its own axis. In a scroll-type fluid machine that revolves while revolving, the inner surface of the hole at the center of the cylindrical boss protruding from the outer surface of the end plate of the orbiting scroll and the outer surface of the outer ring of the orbiting bearing are coated with adhesive. A scroll-type fluid machine characterized in that they are fixed to each other.