JPH0219676A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To make a compressor compact and light and enhance operation performance and durability by integrally projecting a cylindrical portion whose outer diameter is smaller than that of a fixed scroll on the base end wall outside surface of the fixed scroll and covering a cylindrical portion end surface with a cover body so as to form a discharge chamber inside. CONSTITUTION:A cylindrical portion 22 is projectedly formed integrally on the outside surface of the base end wall 9a of a fixed scroll 9, and the diameter is smaller than that of a center housing 3. Also a cover body 23 is fixed on the end surface of the cylindrical portion 22 in such a way as to cover the opening end of the cylindrical portion 22, and a discharge chamber 25 is formed by the base end wall 9a, the cylindrical portion 22 and the cover body 23. The fixed scroll side wall area of the discharge chamber 25 is smaller in this way so that gas pressure upon the cylindrical portion 22, the cover body 23 and the base end wall 9a decreases. Accordingly, the volume of the discharge chamber 25 becomes smaller so that the scroll 9 is not pressed against the revolving scroll 10 side with high pressure, and thereby the contact pressure between both scrolls 9, 10 does not increase, and excessive loads are not put on the balls of scroll revolution mechanism between the scroll 10 and a fixed base 12 so that operation performance and durability can be enhanced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a scroll type compressor, and in particular, a scroll type compressor having a compressor configured to form a compression chamber between a fixed scroll housed in a housing and the fixed scroll. The present invention relates to a scroll compressor that includes an orbiting scroll that is housed and supported so as to be non-rotatable but rotatable, facing a fixed scroll.

[Prior Art J] As a conventional scroll compressor of this type, one having a configuration as shown in FIG. 3, for example, is known. This conventional configuration includes a front housing 2, a center housing 3, a fixed scroll 9, and a rear housing 31.
are joined and fixed by a plurality of through bolts (not shown), and a discharge chamber 25 is formed in the rear housing 31.

[Problems to be Solved by the Invention] However, in this conventional configuration, since the discharge chamber 25 is formed throughout the interior of the rear housing 31, the pressure of the high pressure gas in the discharge chamber 25 is lower than that of the fixed scroll 9. It acts over a wide range on the proximal wall 9a. Therefore, the fixed scroll 9 is pressed against the orbiting scroll 10 side with high pressure, and both scrolls 9, 10
The problem is that as the contact pressure between them increases, an excessive load is applied to the balls 19 of the scroll revolution mechanism provided between the orbiting scroll 1° and the fixed base plate 12, which deteriorates the operating performance and durability of the compressor. There was a point.

Also, since high pressure is applied to the inner wall surface of the rear housing 31, the plate thickness of the housing 31 is increased, and the rear housing 31 is attached to the fixed scroll 9 using a plurality of high-strength bolts 32 in addition to the through bolts. There was a problem in that the compressor needed to be fixed, making the entire compressor large and heavy.

In order to solve the problem of poor operating performance and durability of the pressure mB, it is necessary to increase the thickness of the base end wall 9a of the fixed scroll 9, and as a result, the entire compressor becomes even larger. There was a problem with the large weight.

The present invention has been made in view of the problems existing in the conventional technology, and its purpose is to eliminate the outer wall surrounding the discharge chamber and the base end wall of the fixed scroll. There is no need for a sturdy construction with thick members, and the entire compressor can be made smaller and lighter. In addition, the fixed scroll is not pressed strongly against the orbiting scroll, which improves the operating performance and durability of the compressor. An object of the present invention is to provide a scroll type compressor that can improve performance.

[First Step to Solve the Problems]] In order to achieve the objective described in 1, the scroll compressor of the present invention has a structure having a diameter smaller than the identified scroll outer diameter on the outer surface of the base @ wall of the fixed scroll. A scroll-type compressor configured as described in 9 "Function" 1. A cylindrical part is integrally formed to protrude, and the end face of the joint part is covered with a lid to form a discharge chamber inside. In this case, the fixed scroll side wall area of the discharge chamber is reduced,
The gas pressure applied to the outer wall of the discharge chamber and the proximal wall of the fixed suction tube is reduced.

[Example] Hereinafter, an example of a scroll compressor embodying the present invention will be described in detail based on FIG. 1.

As shown in FIG. 1, the housing 1 is composed of a fluorocarbon housing 2 and a center housing 3, and these housings 2.3 are joined together with a fixed scroll 9, which will be described later, by a plurality of through bolts (not shown) or the like. There is. The rotating shaft 4 is connected to the front housing 2 by a bearing 5.
It is rotatably housed and supported within the interior, and an eccentric shaft 6 is mounted on its inner end surface.
is installed protrudingly. Balance weight 7 and bushing 8
are supported by the eccentric shaft 6 so as to be relatively rotatable, and their relative rotation I is regulated to a predetermined amount by a pin (not shown).

The fixed scroll 9 is fixed to the end face of the center housing 3 so as to be housed in the center housing 3, and is composed of a base end wall 9a and a spiral portion 9b. The orbiting scroll 10 is supported by the bushing 8 so as to be relatively rotatable so as to face and join the fixed scroll 9, and the base end wall 10
a and a spiral portion 10b. The base end walls 9a and 10a of both scrolls 9 and 10 and the spiral portion 9b
, 10b form a compression chamber 11.

A fixed base plate 12 having an annular shape is fixedly arranged on the inner surfaces of the flon 1 to the housing 2 so as to face the base end 910a of the orbiting scroll 10. The fixed ring 13 and the orbiting ring 14 are connected to the fixed base plate 12 and the orbiting scroll 10.
A plurality of circular revolution position regulating pockets 15 and 16 are provided in corresponding rings 13 and 14 at equal intervals in the circumferential direction. . The shoes 17.18 are disc-shaped and have a smaller diameter than the pockets 15.16, and each pocket has a diameter of 15°16.
each opposing shoe 17.18 movably housed within the
A ball is inserted between them.

When the orbiting scroll 10 revolves with the rotation of the eccentric shaft 6 on the rotating shaft 4, the opposing shoe 17
．． 18 holds one ball in each pocket 15.
Circulating while contacting the opposite side of the annular wall surface of No. 16,
Rotation of the orbiting scroll 10 is prevented. Note that the orbital radius of this orbiting scroll 10 is 15.16 mm for both pockets.
This is the sum of the diameters of the rotation loci of the shoes 17 and 18 within the inner diameter.

The suction chamber 20 is provided in the center housing 3, and the refrigerant gas introduced into the suction chamber 20 from the suction port 21 formed in the outer wall of the center housing 3 enters the compression chamber 11, and the above-mentioned orbiting scroll] The revolution of 0 is compressed.

The cylindrical portion 22 is attached to the outer surface of the base end wall 9a of the fixed roll 9.
It is formed protrudingly from the tree and has a smaller diameter than the center housing 3. The lid body 23 is fixed to the end surface of the cylindrical part 22 by a plurality of bolts 24 so as to cover the open end of the cylindrical part 22, and the base end wall 9a, the cylindrical part 22, and the lid body 23 prevent the discharge from being discharged. A chamber 25 is formed. Openable discharge valve 2
6 is formed in the base end wall 9a of the fixed scroll 9, and the refrigerant gas compressed in the compression chamber 11 is discharged into the discharge chamber 25 through this discharge passage 27.

The diameter of the cylindrical portion 22 is such that the pressure P1 acting on the base wall 9a of the fixed scroll 9 from the discharge chamber 25 side is approximately equal to the pressure P2 acting on the base wall 9a from the compression chamber 11 side. It is desirable to set it as follows.

Now, in the scroll type compressor of this embodiment, as mentioned above, the cylindrical part 22 having a diameter smaller than that of the center housing 3 is integrally formed on the outer surface of the base end wall 9a of the fixed scroll 9 and protrudes from the outer surface of the base end wall 9a of the fixed scroll 9. Since the discharge chamber 25 is formed inside with the end face of the discharge chamber 22 covered by the lid 23, the side wall area of the fixed scroll L7 of the discharge chamber 25 is smaller than that of the conventional configuration shown in FIG. The cylindrical part 22 and the lid body 23 which are the outer wall parts of the discharge chamber 25, and the base end wall 9a of the fixed scroll 9
The gas pressure applied to the gas decreases. Therefore, the volume of the discharge chamber 25 is reduced, and the fixed scroll 9 is not pressed against the orbiting scroll 1 call lo side with high pressure. An excessive load is not applied to a single ball of the scroll revolution mechanism provided between the fixed base plate 12 and the fixed base plate 12, and the operating performance and durability of the compressor can be improved.

Further, since the cylindrical portion 22, the lid body 23, and the base end wall 9a of the fixed scroll V7-9 do not need to be made of thick members, and the lid body 23 is fixed to the cylindrical portion 22, There is no need to use high-strength bolts 24, and the entire compressor can be made smaller and lighter.

[Another Embodiment] Next, another embodiment of the present invention will be described based on FIG. 2. In this embodiment, the center housing 3 is formed integrally with the base end wall 9a of the fixed scroll 9. ing. Therefore, in this embodiment, in addition to reducing the size and weight of the compressor, improving operating performance and durability, and simplifying the configuration by reducing the number of parts, as in the above-mentioned embodiments. The center housing 3 is integrated with the front housing 2 and the fixed scroll 9.
Shorter bolts can be used as through bolts for joining and fixing.

[Effect of the invention] Since this invention is configured as explained above,
The side wall area of the fixed scroll in the discharge chamber is reduced, and the dregs pressure applied to the outer wall of the discharge chamber and the base end wall of the fixed scroll is reduced. Therefore, the fixed scroll is not pressed strongly against the orbiting scroll, which improves the operating performance and durability of the compressor. This has the excellent effect of making the entire compressor smaller and lighter without requiring a sturdy structure made of thick members.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a Suffu-X-Fool type compressor embodying this invention, Fig. 2 is a sectional view of a compressor showing another embodiment of this invention, and Fig. 3 is a sectional view of a compressor with a conventional configuration. FIG. ■...Housing, 9...Fixed scroll, 9a.
... Base end wall, 10 ... Orbiting scroll, 11 ... Compression chamber, 22 ... Cylindrical part, 23 ... Lid body, 25 ...
Discharge chamber. Patent applicant: Masudaji Co., Ltd.! I+Gff! Factory agent Patent attorney On 1) Hironobu

Claims (1)

[Claims] 1. A scroll type comprising a fixed scroll housed in a housing and an orbiting scroll housed and supported so as to be non-rotatable and rotatable in opposition to the fixed scroll so as to form a compression chamber between the fixed scroll and the fixed scroll. In the compressor, a cylindrical portion having a smaller diameter than the outer diameter of the fixed scroll is integrally formed on the outer surface of the base end wall of the fixed scroll, and an end surface of the cylindrical portion is covered with a lid to form a discharge chamber inside. scroll type compressor.