JPS62111184A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To improve the strength of a connection part in a scroll member while its weight lightness is promoted, by forming a turning scroll and a connecting member, which fixes the turning scroll to a shaft, by a material of different quality. CONSTITUTION:A turning scroll member 18 forms its end plate 18a and lap 18b by a metal of aluminum or the like having small specific gravity while a connecting member 19, which fixes the turning scroll 18 to a driving shaft, by a metal of iron or the like having large strength. Consequently, the strength of the connecting member can be improved with no necessity for increasing weight of the turning scroll member 18, and a scroll compressor can be prevented from generating a trouble.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a scroll compressor used in refrigeration cycles and the like.

Prior Art A conventional configuration will be explained with reference to FIGS. 4 and 6. 1 is a sealed casing, 2 is an electric motor section, and a block 3. Fixed scroll 4. A mechanical part main body 7 composed of an orbiting scroll 6 and an anti-rotation mechanism 6 is fixed. The fixed scroll 4 is composed of an end plate 4a and an involute standing upright on the end plate 4a, or a wrap 4b having a uniform thickness and a curve similar to an involute, and is fixed to the block 3 by the end plate 4a. Further, the orbiting scroll 6 is composed of an end plate 5a and a wrap 6b standing upright on the end plate 6a and having the same curve as the wrap 4b of the fixed scroll 4,
The end plate 6a is connected to the end plate 4a of the fixed scroll 4 and the block 3.
It is sandwiched and supported with a clearance Ai provided between the two, and is restrained by an anti-rotation mechanism 6. The fixed scroll 4 and the orbiting scroll 6 are aligned with the end ends 4b' and sb' of each wrap 4b and sb shifted by a certain angle.

8 is a discharge hole, and 9 is a suction hole. The discharge hole 8 is provided at the center of the involute of the fixed scroll 4, and the suction hole 9 is provided at the outer edge of the end plate 4a of the involute of the fixed scroll 4. 10 is a wrap 5b of the orbiting scroll 6
This is a protrusion provided on the opposite surface of the wrap 5b, and is concentric with the center of the involute of the wrap 5b. 11 is block 3
The next shaft is supported via a thrust bearing 12, and the protrusion 1o of the orbiting scroll 6 is accommodated in the boss portion 11a provided at the end of the seven machine body parts and eccentric from the center of the shaft. The scrolls 6 are connected. In addition, an oil supply hole 11 is provided in the center of the shaft 11.
b passes through the oil reservoir space 1 formed by the boss portion 11a of the shaft 11 and the protrusion 10 of the orbiting scroll 6.
3 and the lower part of the sealed casing 1 are communicated with each other. Reference numeral 14 denotes a back pressure chamber formed on the back surface of the orbiting scroll 5, and the wrap 6b side of the orbiting scroll 6 communicates with a lower pressure section than the clearance A of the end plate 5a and 4a.

16 is a suction pipe communicating with the suction hole 9, and 16 is a discharge pipe. Further, 17 is lubricating oil accumulated in the lower part of the sealed casing 1.

Next, the compression mechanism of the scroll compressor will be explained. The rotational movement of the shaft 11 accompanying the rotation of the electric motor section 2 is transmitted to the orbiting scroll 6 via the boss section 11a and the protrusion section 10, but due to the action of the rotation prevention mechanism 60, the orbiting scroll 5 does not rotate on its own axis and moves toward the fixed scroll 4. The center of the involute is the center of rotation. At this time, the winding end ts b' of the wrap 6b of the orbiting scroll 6 is connected to the wrap 4b of the fixed scroll 4, and the fixed scroll 40
Suction is complete when the winding ends 4b' of the wraps 4b are in contact with the wraps 6b of the orbiting scroll 50, and as the orbiting scroll 6 revolves, the wraps 4b and 6
The pressure in the compression space S increases as the two points of contact between b come closer to the center of the involute.

By the compression mechanism of this scroll compressor, the refrigerant sucked from the suction pipe 15 through the suction hole 9 is compressed and the refrigerant is compressed through the discharge hole 8.
After being once discharged into the closed casing 1 through the discharge pipe 16, it is discharged into a cooling system (not shown).

Problem to be Solved by the Invention In this compression process, the protrusion 1 of the orbiting scroll 6
The resultant force of the compression load and the centrifugal force of the orbiting scroll 6 acts on o. Particularly when operating this scroll type compressor at high speed, in order to reduce the bearing load between the shaft 11 and the block, a method is adopted in which the material of the orbiting scroll 6 is made of a lightweight metal such as aluminum without reducing the centrifugal force. Projection 1
0 is also integrally molded from aluminum, etc., and aluminum is generally more susceptible to displacement and strain than iron, so the protrusion 1
There was a problem in that the root part of the o was attached to the mirror plate 18a and broke.

The present invention solves the above-mentioned drawbacks of the conventional example.The orbiting scroll is made of lightweight metal such as aluminum to reduce centrifugal force as in the past, and the connecting portion is made of a strong material to ensure reliability. The purpose is to improve sexual performance.

Means for Solving the Problems The present invention provides a conventional orbiting scroll in which the connecting portion with the shaft is made a separate member from the orbiting scroll, for example, the orbiting scroll is made of aluminum and the connecting member is made of strong iron. It is fixed to the orbiting scroll.

According to the present invention, with the above-described configuration, the orbiting scroll is made of aluminum except for the connecting members, as in the past, and the bearing load can be reduced by reducing centrifugal force, and the connecting members are made of iron-like material. Since it is made of a material that is strong in strength, problems such as breakage of the connecting member are eliminated.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1, 2, and 3. Incidentally, the same parts as in the conventional example are given the same reference numerals, and the description thereof will be omitted.

Reference numeral 18 denotes an orbiting scroll, which has a wrap 18b having the same shape as the conventional scroll and standing upright on an end plate 18a. A connecting member 19 is formed by a projection 19a and a disk portion 19b, and is fixed to the orbiting scroll 18 (pol) 20a to 20d7. Furthermore, the orbiting scroll 18 and the connecting member 19 are made of different materials; in this embodiment, the orbiting scroll 18 is made of aluminum, and the connecting member 19 is made of iron-based metal.

With the above configuration, the orbiting scroll 18 is made of aluminum as before, and even if the total weight of the connecting member 19 is made lighter than when the orbiting scroll 18 is made entirely of iron-based metal, the centrifugal force is reduced. can do. Therefore, the force applied to the connecting member 19 can be kept small, and since the connecting member 19 itself is made of an iron-based material stronger than aluminum, the reliability of the connecting member 19 is greatly improved. Furthermore, the bearing load between the shaft 11 and the block 3 is also reduced due to the reduced centrifugal force, improving reliability.

In the present embodiment, the connection member 19 of the orbiting scroll 18 is described as having the protrusion 19a, but it goes without saying that a type having a boss instead of the protrusion and into which the crank of the shaft is inserted can also be used. stomach. or,
Any method may be used for fixing the connecting member 19 to the orbiting scroll 18, as long as the connecting member 19 is securely fixed to the orbiting scroll. Furthermore, the diameter of the disk portion 19b of the connecting member 19 may be arbitrary, and therefore the rotation preventing mechanism 6 may be configured so that it does not directly contact the orbiting scroll 18, but the connecting member 19 and the rotation preventing mechanism 6 come into contact with each other.

Effects of the Invention As is clear from the above description, the present invention provides an orbiting scroll comprising two mutually engaged orbiting and fixed scrolls having wraps standing upright on the end plate, and a connecting member fixed to the end plate of the orbiting scroll and connected to the shaft. For example, the orbiting scroll is made of a metal with low specific gravity such as aluminum, and the connecting member is made of a metal such as iron that has stronger strength than the orbiting scroll. Since the total weight of a certain orbiting scroll and the connecting member can be reduced and the centrifugal force can be reduced, the force applied between the shaft and the block can be reduced and reliability can be improved.The force applied to the connecting member can also be reduced, and the material of the connecting member can be changed. It can be made stronger and the reliability of the connecting member itself can also be improved.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a scroll compressor showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an orbiting scroll, and FIG. 3 is an enlarged sectional view of an orbiting scroll.
The figure is a view of the orbiting scroll in the direction of arrow (■) in Figure 2, Figure 4 is a vertical sectional view showing a conventional scroll compressor, and Figure 6 is a sectional view taken along the v-v' line in Figure 4. . ４・・・・・・Fixed scroll nope 4 a ・−・・−・
Fixed scroll end plate, 4b...Fixed scroll wrap, 11...Shaft, 18...
... Orbiting scroll, 18a... End plate of orbiting scroll, 18b... Wrap of orbiting scroll, 19... Connection member.

Claims (2)

[Claims] (1) comprising two mutually interlocking orbiting and fixed scrolls having wraps standing upright on the end plate, and a connecting member fixed to the end plate of the orbiting scroll and connected to the shaft;
A scroll compressor in which the orbiting scroll and the connecting member are made of different materials. (2) The scroll type compressor according to claim 1, wherein the orbiting scroll is made of a metal with low specific gravity such as aluminum, and the connecting member is made of a metal such as iron that is stronger in strength than the material of the orbiting scroll.