WO1991006777A1

WO1991006777A1 - Scroll compressor

Info

Publication number: WO1991006777A1
Application number: PCT/JP1990/001425
Authority: WO
Inventors: Yoshinori Kojima; Michio Yamamura; Jiro Yuda; Syuichi Yamamoto; Sadao Kawahara; Manabu Sakai; Shigeru Muramatsu; Osamu Aiba
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 1989-11-02
Filing date: 1990-11-02
Publication date: 1991-05-16
Also published as: DE4092107T; KR920701676A; KR950000263B1; JP2723635B2; JPH03149386A

Abstract

A lap disposed in the vicinity of a terminal point of a fixed scroll (4) on the side of an intake chamber (13) is recessed, so that a revolving scroll (5) can be prevented from colliding, damages to the both laps can be avoided and noise can be prevented from occurring. Furthermore, the provision of a relief in the vicinity of the lap terminal point of the revolving scroll (5) makes it possible to prevent the revolving scroll (5) from colliding with the fixed scroll (4), avoid damages to the both laps and prevent noise from occurring.

Description

Specification

Title of invention

Scroll compressor

Technical field

The present invention relates to a scroll type compressor.

Background art

As is well known, a scroll compressor has a suction chamber at the outer periphery, a discharge port at the center of the spiral, and two symmetrical spiral compressions where the fluid joins the discharge port. The space is compressed sequentially from the outer peripheral portion toward the central compression chamber to perform a compressing action. Fig. 1 and Fig. 2 show the structure of a conventional scroll compressor. A scroll compressor 2 and a motor 3 are built in a closed container 1. Scroll compressor 2 Mainly composed of fixed scroll 4, revolving scroll 5, rotation prevention mechanism 6, crank shaft 7, frame 8, and bearing 9. I have. A fixed scroll 4 I is provided with a spiral wrap 11 standing upright on the end plate 10, and the wrap 11 is a conventional force, as is known in the art. Rhythm ί ί Fountain This is formed by curves combining arcs. In addition, a suction hole 12 for sucking the compressed gas is provided in the outer peripheral portion. A suction chamber 13 communicating with the suction hole 12 is provided with a discharge hole 14 in the center of the end plate 10. On the other hand, the turning scroll 5 has a head plate 15 and a spiral wrap 16 standing upright. The shapes of the wraps 11 and 16 of the fixed scroll 4 and the swivel scroll 5 are symmetrical with respect to each other, and the angles are shifted by 180 °. ing. In addition, the fixed scroll 4 and the turning scroll 5 are combined so that the centers of the spirals are shifted by the turning radius. The other two wraps 11 and 16 are in contact or close to each other at a plurality of points (hereinafter referred to as contact), and a plurality of compression chambers 17 are formed. In addition, a boss portion 18 into which a crank shaft 7 is inserted is provided on the back of the turning scroll 5. A rotation preventing mechanism 6 is incorporated between the back of the turning scroll 5 and the frame 8. The crankshaft 7 is supported by a frame 8 via a bearing 9, one end of which is fitted with a rotor of the motor 3, and the other end of which is a boss of the orbiting scroll 5. Has been inserted in 1 8. In this configuration, when the crankshaft 7 is rotated by the rotation of the motor 3, the turning scroll 5 is fixed by the rotation preventing mechanism until the posture is maintained by the rotation preventing mechanism. Makes a turning motion with respect to Crawl 4. Then, the compression chamber 17 formed by the engagement of the fixed scroll 4 and the swirl scroll 5 (the scroll chamber 17 is swung by the swivel motion of the swirl scroll 5). As a result, the low-pressure gas taken in from the suction holes 12 passes through the suction chamber 13 and is compressed in the above process. The gas is discharged from the discharge hole 14 of the scroll compression part 2 into the closed container 1. Thereafter, the high-pressure gas in the closed container 1 is sent out from the discharge pipe 19 to the outside.

Fig. 2 shows a plan view of both scroll wraps. The fixed scroll mouth is a rotating scroll that pivots to the end points 11a and 11b of the loop wrap 5. Compression starts from the point of contact, but is set to zero or a very small value to improve the radial gap seal between the scroll wraps. That is, the orbiting scroll 5 is performing a turning motion while colliding with the fixed scroll opening / loop end point 11a. This collision caused both scrolls This can cause rupture of the wrap and noise. In addition, the turning scroll 5 is performing a turning motion without colliding with the fixed scroll wrap end point 11b. This collision may cause destruction of both scroll wraps and generate noise.

Disclosure of the invention

The present invention has been made to solve the above-described problems, and has as its object to prevent a collision of the swivel scroll with the end point of the fixed scroll portal suction chamber side. It is what you do.

Another object of the present invention is to prevent collision of the turning scroll with the fixed scroll wrap end point 11b.

In order to solve the above problems, the present invention is provided with a relief in a wrap near the fixed scroll suction chamber side end point.

In addition, the present invention provides a relief in the vicinity of the wrap end point of the turning scroll.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a longitudinal section showing a conventional scroll compressor. ¾ Fig. 2 is a cross section of the scroll wrap section in Fig. 3 a. Fig. 3 is a sectional view of a first embodiment of the present invention. Enlargement near the end point of the scroll wrap El FIG. 4 is an enlarged view of the vicinity of the end point of the scroll wrap according to the second embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Basic structure

The ^ action is the same as in the conventional example shown in FIG. 1 and FIG. A first embodiment of the present invention will be described with reference to FIG. same Fig. Both scroll wraps at the start of compression are shown, and the enlarged view near 11a in Fig. 4 shows the shape before embodying the present invention. That is, as shown in Fig. 3, the wrap near the end point of the fixed scroll on the suction chamber side is provided with an arc or straight relief. The length 1 of this clearance should be about the turning radius, and the clearance m at the end point is a maximum of the clearance between the bearing and the crankshaft and the clearance between the boss and the crankshaft. It just needs to be added. By providing this relief, the turning scroll gradually comes into contact with the wrap of the fixed scroll without colliding at the end point 11a, causing damage to both wraps and noise. The occurrence can be eliminated. Next, a second embodiment of the present invention will be described with reference to FIG. Fig. 2 shows both scroll wraps at the start of compression.Fig. 2 is an enlarged view near 11b in Fig. 2, and an arc or a straight line escapes near the end of the orbiting scroll wrap. Is provided. The clearance length 1 may be about the turning radius, and the maximum clearance m is the sum of the clearance between the bearing crank shaft and the clearance between the boss and the crank shaft. By providing this escape, the turning scroll gradually contacts the wrap of the fixed scroll without colliding at the end point lib, causing damage to both wraps and generating noise. Can be eliminated. In the above configuration, in addition to the effect that collision does not occur at the end point 11a of the fixed scroll wrap, collision at the end point lib can also be avoided, resulting in damage to both laps and noise. Becomes even smaller.

Industrial applicability

As is clear from the above embodiment, a relief is provided near the end point of the fixed scroll wrap. The fixed scroll of the turning scroll This makes it possible to avoid collision with the wrap, and to obtain a scroll compressor with high durability, high reliability and low noise.

Claims

The scope of the claims

1. A spiral support scroll formed on one side of the end plate that forms part of the fixed scroll, and a wrap-supporting disk that forms part of the swivel scroll The swivel scroll wrap is swingably and rotatably engaged to form a spiral compression space between the two scrolls, so that the spiral scroll wrap is formed at the center of the fixed scroll wrap or the center of the swivel scroll wrap. Is provided with a discharge port, a suction chamber is provided outside the fixed scroll wrap, and the compression space is divided into a plurality of compression chambers which continuously shift from the suction side to the discharge side to form a fluid. A scroll compression mechanism that forms a scroll compression mechanism for compressing the air, and moves the wrap at the start of the formation of the compression space of the fixed scroll wrap in the outer circumferential direction.

2. The scroll compressor according to claim 1, wherein a relief is provided on the inner peripheral side near the end of the swivel scroll on the suction chamber side.