JPS58160579A - Scroll compressor - Google Patents

Abstract

PURPOSE:To automatically decrease a gap between both turning and fixed scrolls, by idly fitting an eccentric cylinder member fitted to an eccentric shaft to a turning scroll bearing and controlling a turning radius with a turning effect urged through a spring in the direction of increasing an eccentric radius. CONSTITUTION:A cylinder member 7 is inserted into an eccentric shaft 6b of a crankshaft 6, and pins 9, 10 are fixedly press fitted respectively to a pin hole 7d of a flange 7c and a pin hole 6e of a disc 6c, while the pin 9 is extended through a circular arc hole 6d, and each end 8a, 8b of a spring 8 is stopped to point ends of the both pins 9, 10. Then the member 7 is rotated to a certain angle against spring tension to move the center of an external contour cylinder, for instance, as to positions 13a, 13b, and a distance from the center 12 of the crankshaft 6, that is, an eccentric radius is changed as shown by distances 14a, 14b. A scroll compressor built with this crankshaft receives initial force, in which a turning scroll is pressed to the outside, and teeth of the turning scroll are turned profiling teeth of a fixed scroll.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scroll compressor in which an orbiting scroll is driven by a crankshaft, and more particularly to a scroll compressor in which the eccentric radius of the crankshaft can be automatically adjusted.

In conventional scroll compressors, there is a swing link method as a drive method that allows the radius of gyration to be varied. In this system, the crank pin part and the center part of the orbiting scroll are each connected by a direct rod that is freely supported for n rotations, and when the crankshaft rotates, the orbiting scroll is rotated as if being pulled through the connecting rod. At this time, centrifugal force acts on the orbiting scroll,
The teeth of the orbiting scroll are pressed against the teeth of the fixed scroll to rotate.

However, this method has problems such as complicated shape and structure and high processing costs.

The present invention was invented in view of the above, and even if there is a dimensional error or shape error during processing, the teeth of the orbiting scroll automatically follow the skin of the fixed scroll and rotate, allowing for assembly such as selective fitting. It is an object of the present invention to provide a scroll compressor that is not difficult, has no gaps between teeth, and has good performance with little o1 leakage.

In order to achieve the above object, the present invention further rotates an eccentric cylinder around an eccentric axis, so that the center of this cylinder changes from the origin [1111119], and the center of this cylinder moves in a direction farther from the origin The times when it turns into...

It is characterized by giving power.

An embodiment of the present invention will now be described with reference to the drawings.

FIG. 1 shows the overall structure of a scroll compressor. The main components are a pressure ia+ia section consisting of a fixed scroll 2 and an orbiting scroll 3, a crankshaft 6 for orbiting the orbiting scroll 2, an electric motor 5, etc., inside a casing 1. Gas is sucked in through the suction pipe 21, compressed in the compression chamber 4, and discharged into the casing 1, and then into the discharge pipe 2.
2 and is discharged outside the machine.

The mold in this embodiment is located on the shoe shaft 6, and its structure and cleaning will be explained f1 based on FIGS. 42 to 8.

Fig. 3 shows the crankshaft 6, with an eccentric shaft 6b protruding from the upper part of the main shaft 6a, which is centered o1 from the axis of the main shaft, and a disc concentric with the eccentric shaft 6b at the continuous pitch portion of the main shaft 6a and the eccentric shaft 6b. 6C are arranged in series, and a circular arc hole 6d and a bottle hole 6e are bored in the circular plate 6C.

Fig. 2 shows a cylindrical member I, which is formed into a cylinder having an eccentric outer diameter with a hole 7b that loosely fits into the eccentric cylinder 7a, that is, the eccentric shaft 6b. A concentric collar 7C4-4 is protruded from the hole 1b, and a bottle hole 1d is bored at a position opposite to the arcuate hole 6d.

FIG. 4 shows the pin inserted into the bottle hole 1d, and FIG. 6 shows the pin inserted into the bottle hole 6C.

1s5 shows a spring, and the spring 80 is formed into a circular shape with a larger diameter than the main body 11116a.Both ends of the spring 80 are bent to form locking portions 8a and 8b.

The above-mentioned parts are assembled as shown in FIG. That is,
The cylindrical member 1 is inserted into the eccentric shaft 6b of the crankshaft 6, and the pins 9 and 10 are press-fitted and fixed into the pin holes 1d of 7C and the pin holes 6C of the disc 6C, respectively. 6d, and each 488.8b of tabs t'28 are moored to the tips of both beams/9.10. The force tζ of the spring 8 acts on the eccentric shaft 6a of the circular member 7Fi to rotate it clockwise in the figure. That is, the center of the cylindrical S material I is receiving a force that moves it away from the center of the crankshaft 6. It is assumed that the compressor is operated by rotating the crankshaft 6 clockwise in FIG. 9, 7L.

With this structure, as shown in Fig. 4, the center of the outer diameter cylinder moves as shown in 13a and tab, as the unicircle m section off rotates against the spring force. However, the distance from the center 12 of the crankshaft 6; the eccentric radius changes from 14a to 14b.

A scroll compressor incorporating this crankshaft receives an initial force that pushes the orbiting scroll outward, causing the skin of the orbiting scroll to orbit following the teeth of the fixed scroll.

As explained above, according to the present invention, if the diameter of the single center #P of the eccentric shaft 6b is manufactured according to the design value, the thickness and shape of the teeth may vary slightly due to the machining error of the scroll. Even if a Loe error occurs, the eccentric radius is automatically adjusted so that the teeth of the orbiting scroll are pressed against the teeth of the fixed scroll in the radial direction by force, so it is possible to use several types of crankshafts. It is possible to provide a scroll compressor with good performance and less leakage without requiring the labor and expense of manufacturing and selectively fitting.

Incidentally, there is a swing link system that achieves a similar purpose, but its shape and structure are complicated. In contrast,
The present invention has a simple structure consisting of a cylindrical part, for example,
It can be mainly processed using a lathe, and has advantages such as low processing costs.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of the overall structure of a scroll compressor, Figure 2
Figures 8 to 8 are diagrams of a drive mechanism according to an embodiment of the present invention, in which Figure 2 shows a cylindrical member, Figure (a) is a plan view, Figure 1) is a
111 sectional view, FIG. 3 shows the crankshaft, FIG. 11A is a plan view, FIG. Figure 5 shows the spring, (a) is a plan view, (b)
) is a front view, and Figure 6 shows the pin. FIG. 1 shows an assembled diagram of the am mechanism, and FIG. 8 is a diagram illustrating the eccentric radius A11t. 1... VMvI4 container 2... Fixed scroll member 3... Orbiting scroll member 4... Compression chamber
5...Electric motor 6...Crankshaft 6a...
Main shaft 6b... Eccentric shaft 6C... Disc 6d
...Circular hole 6C...Bin hole 7...Cylindrical member
7a... Eccentric cylinder 7b... Hole IC...
Brim 7d...Bottle hole...Spring 8a18b...
... Locking part 9, 10 ... Pin 21 ... Suction pipe 22 ... Discharge pipe 10 (α) (a)

Claims (1)

[Claims] A fixed scroll member and an orbiting scroll member each having a spiral wrap standing upright on an end plate are provided, and both scroll members are engaged with each other to form a compression chamber, so that the orbiting scroll member does not rotate relative to the fixed scroll member. In a scroll compressor that performs a compression action by making an orbital movement and gradually reducing the volume of a compression chamber, an eccentric cylindrical member is engaged with an eccentric shaft of a crankshaft, and the circular member is loosely fitted into a bearing of an orbiting scroll member, A spring is used to apply a rotational force to the eccentric cylindrical member in the direction of increasing the eccentric radius, and the eccentric radius is varied by the power of the vaginal opening. Scroll pressure #1 machine that is characterized by: