JPH0315686A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent a fixed scroll from deforming by fastening force of an enclosed container, by forming a groove in a pressure-contact part between a fixed scroll itself and its enclosed container, in the fixed scroll which builds up a compression element stored in the enclosed container together with a rocking scroll. CONSTITUTION:A scroll compression element 10 is stored inside an enclosed container 1, and it is constituted by a fixed scroll 11 and a rocking scroll 12. And also, the projecting part 27 of the fixed scroll 11 is engaged with a recessed part 28 formed on the upper cover body 3 of the enclosed container 1, and the inside of the enclosed container 1 is partitioned in a high pressure chamber 29 and a low pressure chamber 30. In such a construction, an annular groove 33 whose upper part is opened is formed in the end plate 13 of the fixed scroll 11, and it is arranged on the inner side of the projecting part 27 making pressure-contact with the inner wall of the upper cover part 3, and arranged on the outside from a lap 15. And fastening force of the enclosed container 1 is absorbed by the groove 33 so as to prevent the fixed scroll 11 from deforming by the fastening force.

Description

[Detailed description of the invention] (A) Industrial application field This invention presses a fixed scroll against the inner wall of a closed container,
This article relates to a scroll compressor in which the inside of the container is divided into a high pressure chamber and a low pressure chamber. (B) Conventional technology A conventional general scroll compressor has a fixed scroll that is in pressure contact with the inner wall of a closed container, and divides the inside of the closed container into a high pressure chamber and a low pressure chamber. The electric element is effectively cooled (Japanese Patent Application Laid-open No. 6
(See Publication No. 3-124893). (c) Problems to be Solved by the Invention However, since conventional fixed scrolls are attached to the inner wall of a sealed container by shrink fitting or press fitting, they are deformed by the tightening force of the sealed container, causing the oscillating scroll to There was a problem in that the clearance dimensions of the sliding surface changed, resulting in partial contact and increased clearance, resulting in a decrease in refrigeration capacity due to wear and refrigerant leaks. In order to solve this problem, conventional fixed scrolls were reinforced by increasing the thickness of the outer periphery or end plate that contacts the inner wall of the closed container, but this resulted in the overall structure becoming larger and heavier. There was a problem with this. The present invention solves the above problem, and provides a scroll compressor in which even if the fixed scroll is brought into pressure contact with the inner wall of the sealed container, the tightening force of the sealed container does not act on the inside of the fixed scroll. The purpose is to (2) Means for Solving the Problems This invention houses an electric element and a scroll compression element in a closed container, and connects the compression element to a fixed scroll having a spiral wrap erected on the end plate, and a fixed scroll having a spiral wrap erected on the end plate. It is composed of an oscillating scroll in which a spiral wrap is erected and is engaged with the fixed scroll facing each other, the oscillating scroll is made to revolve around the fixed scroll without rotating, and the fixed scroll is placed in an airtight container. In this scroll compressor, the inside of the hermetic container is divided into a high pressure chamber and a low pressure chamber by being brought into pressure contact with the inner wall of the hermetic container, and the fixed scroll is provided with a groove near the inner side of the outer circumferential surface which is brought into pressure contact with the inside wall of the hermetic container. <*) Effect This invention is constructed as described above, so that the clamping force of the hermetic container acting inwardly on the fixed scroll in pressure contact with the inner wall of the hermetic container is transferred to the outer circumferential surface of the fixed scroll in contact with the container. A groove provided near the inside absorbs the force so that the tightening force of the closed container does not act on the inside of the fixed scroll.

(f) Examples The present invention will be explained below based on the examples shown in FIGS. 1 and 2.

Reference numeral 1 denotes an airtight container, and this container is formed of a cylindrical case 2, and an upper lid 3 and a lower lid 4 that enclose the upper and lower openings of the case. An electric compressor main body 5 is housed inside the airtight container 1. The dynamic compressor main body 5 includes a frame 7 having a bearing 6 in the center, an electric element 9 having a rotating shaft 8 supported by the bearing 6 of the frame 7 on the lower side of the frame, and a rotating shaft of this electric element on the upper side. a scroll compression element 10 driven by a shaft 8; The scroll compression element 10 is composed of a fixed scroll 11 and an oscillating scroll 12. The fixed scroll 11 includes a mirror plate 13, an annular wall 14 protruding from the periphery of one side of the mirror plate, and a spiral spiral shaped like an involute or a curved line approximating this, which is surrounded by the annular wall and stands upright on the mirror plate 13. shaped wrap 15
It consists of A discharge boat 16 is provided at the center of the end plate 13 of the fixed scroll 11. The fixed scroll 11 is fixed to a mounting leg 17 on the periphery of the frame 7 with bolts 18, with the annular wall 14 and the wrap 15 extending downward. Oscillating scroll 1
Reference numeral 2 denotes an end plate 19, a spiral wrap 20 formed of an involute shape or a curved line approximating the involute, and a pin portion 21 protruding from the center of the other surface of the end plate 19. It consists of The oscillating scroll 12 is configured such that the projecting direction of the wrap 20 is upward, and the wrap faces and engages with the wrap 15 of the fixed scroll 11 to form a plurality of compression spaces 22 inside. Reference numeral 23 denotes a boss hole provided in the intermediate bearing member 24 attached to the tip of the rotating shaft 8, into which the pin portion 21 of the orbiting scroll 12 is inserted, and the center of this boss hole is eccentric to the axis of the rotating shaft 8. It is being A balance weight 25 is provided on the intermediate bearing member 24 around the boss hole 23. Reference numeral 26 denotes a rotor dam joint that allows the oscillating scroll 12 to revolve on a circular orbit relative to the fixed scroll 11 without rotating. A frame 7 and an electric element 9 are installed inside the cylindrical case 2 of the closed container 1. A fixed scroll 11 placed on the upper end surface of the cylindrical case 2 is fixed to the inner wall of the upper lid body 3 by shrinkage fit.

An annular protrusion 27 is provided at the upper part of the outer circumferential surface of the fixed scroll 11 that is in pressure contact with the inner wall of the upper lid 3, and this protrusion is fitted into an annular recess 28 provided on the inner wall of the upper lid 3 to close the closed container. It forms a sealing surface that divides the inside of 1 into a high pressure chamber 29 and a low pressure chamber 30. 31 is a discharge pipe, and this discharge pipe is attached to the upper lid body 3 so as to communicate with the high pressure chamber 29. 32 is a suction pipe, and this suction pipe is attached to the cylindrical case 2 so as to communicate with the low pressure chamber 30. 33 is an annular groove provided in the end plate 13 of the fixed scroll 11 with an open upper part, and this groove is provided near the inside of the protrusion 27 that presses against the inner wall of the upper lid body 3 and outside the wrap 15. It is being done. In the scroll compressor configured in this manner, when the electric element 9 is rotated, its rotational force is transmitted to the swinging scroll 12 via the rotating shaft 8. That is, the oscillating scroll 12 is driven by a pin portion 21 inserted into a boss hole 23 of an intermediate bearing member 24 attached to the rotating shaft 8 eccentrically with respect to the axis of the rotating shaft, and is fixed by a rotary dam joint 26. It revolves on a circular orbit so as not to rotate relative to the scroll 11. Then, the fixed scroll 11 and the swinging scroll 12 gradually reduce the compression space 22 formed by these scrolls from the outside to the inside, and the air flows into the low pressure chamber 30 in the closed container 1 from the suction pipe 32. It compresses the refrigerant. This compressed refrigerant is discharged from the discharge boat 16 of the end plate 13 of the fixed scroll 11 into the high pressure chamber 29, and then discharged from the discharge pipe 31 to the outside of the closed container 1. The fixed scroll 11 that partitions the inside of the closed container 1 into a high pressure chamber 29 and a low pressure chamber 30 is located near the inside of the annular protrusion 27 that presses against the inner wall of the upper lid 3, and
By providing an annular groove 33 on the outside of the wrap 15,
The groove 33 absorbs the tightening force when the upper cover body 3 is shrunk-fitted, prevents the end plate 13 from deforming, and maintains an appropriate clearance between the sliding surface and the swinging scroll 12. There is. That is, the annular groove 33 prevents the upper lid 3 from tightening against the end plate 13 inside the groove 33 even if the outer peripheral portion of the fixed scroll 11 that contacts the inner wall of the upper lid 3 deforms inward due to the tightening force of the upper lid 3. This prevents any applied stress from acting on it. This invention provides an annular groove 33 in the fixed scroll 11, so that the fixed scroll 11 is mounted in pressure contact with the inner wall of the closed container 1, and the inside of the container is divided into a high pressure chamber 29 and a low pressure chamber 30.
Even if it is partitioned into two parts, the clamping force of the closed container 1 is prevented from acting on the inside of the fixed scroll 11, and the sliding surface of the fixed scroll with respect to the oscillating scroll 12 is prevented from being deformed. be. (G) Effects of the Invention As described above, according to the present invention, a groove is provided near the inner side of the outer peripheral surface of the fixed scroll that is in pressure contact with the inner wall of the hermetic container. It is possible to prevent the scroll from deforming due to the tightening stress of the sealed container, and prevent the end plate and wrap of the fixed scroll from tilting and partially contacting the oscillating scroll, or from partially increasing the clearance dimension. This prevents wear and refrigerating capacity from decreasing due to refrigerant leaks.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a vertical sectional view of a scroll compressor showing an embodiment of the present invention, and Fig. 2 is an enlarged sectional view of essential parts showing a combination of a fixed scroll and an oscillating scroll. This is a diagram. 1... Airtight container, 9... Electric element, 10.
... Scroll compression element, 11... Fixed scroll, 12... Oscillating scroll, 5, 20... Wrap, pressure chamber, 33... Groove. 13.19...End plate, 1 29...High pressure chamber, 30...Low

Claims (1)

[Claims] 1. A motorized element and a scroll compression element are housed in a closed container, and the compression element is fixed by a fixed scroll having a spiral wrap erected on the end plate and a spiral wrap erected on the end plate. It consists of a scroll and an oscillating scroll that are engaged with each other, and the oscillating scroll is made to revolve around a fixed scroll so as not to rotate, and the fixed scroll is brought into pressure contact with the inner wall of a sealed container to create high pressure inside the sealed container. A scroll compressor partitioned into a chamber and a low pressure chamber, wherein the fixed scroll is provided with a groove near the inner side of an outer circumferential surface that presses against an inner wall of a closed container.