JPS58222992A - scroll fluid machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scroll fluid machine comprising a fixed scroll and an orbiting scroll each having a wrap provided vertically on an end plate, and an Oldham ring for preventing rotation of the orbiting scroll.

A conventional scroll fluid machine, for example, a scroll compressor, as shown in FIG. It consists of an orbiting scroll 2 which is attached to a shaft 7 and has a spiral wrap 2B provided vertically to two end plates, and an Oldham ring 3 which is fixed to a frame 4 via an Oldham key 5A and prevents rotation of the orbiting scroll 2. No, both scrolls 1°-2
is combined so that its two wraps IB and 2B face each other.

The crankshaft 7 is integrally connected to one end of the main shaft 6 9, and the other end of the main shaft 6 is provided with a shaft seal 10 and a shaft coupling 11 attached thereto.

Further, as shown in FIG. 2(b), the Oldham ring 3 is provided with a set of key grooves 3A on one end surface and a set of key grooves 3B on the other end surface so as to be perpendicular to each other. ing. End face of frame 4 and mirror plate 2B of rotating frame 2
As shown in Figure 2 (C) and (a), there is a key 5 on the back of the
A and 5B are provided to face the keyways 3A and 3B of the Oldham ring 3, respectively.

The compression principle of the scroll compressor having the above structure will be explained with reference to FIG. In the same figure (a), the spiral wrap IB of the fixed scroll and the spiral wrap 2B of the orbiting scroll are meshed with each other with their spiral centers shifted, and the center of the orbiting wrap 2B is rotated around the center of the identified wrap IB. The gas is inhaled from the suction port 13 and both laps I
This figure shows a state in which the crescent-shaped compression chamber 12 formed by B and 2B is sealed, that is, a state in which suction is completed.

From this state, the turning lap 2B is 90° and 180°.

When rotated by 270 degrees, the compression chamber 12 contracts while moving from the outside to the inside, as shown in (b), (c), and (d) in the same figure.
) and the gas is compressed. When the turning wrap 2B is further turned from the state (d) (270°), the compressed gas in the compression chamber 12 is discharged from the discharge port 14.
:′.

Next, the operation of the conventional scroll compressor mentioned above will be explained.

When the main shaft 6 is rotated by a power source (not shown) via the shaft coupling 11, the orbiting scroll 2 is driven via the crankshaft 7 connected to the main shaft 6, and rotates with the eccentricity as the radius. The operation is carried out to achieve a pressure of l! based on the above compression principle. i1
Perform M action.

In this case, the rotation of the orbiting scroll 2 is restrained by the Oldham ring 3 and the two sets of keys 5A and 5B. That is, the Oldham ring 3 reciprocates on the key 5A provided on the frame 4, and the Oldham ring 3 and the orbiting scroll 2
The key 5B provided there reciprocates. By combining these movements, the orbiting scroll performs an orbiting motion by revolving around itself without rotating.

As mentioned above, in the conventional scroll compressor, a set of keyways (
Or key) In order to install 3A and 3B respectively, it is necessary to turn it back and process it.
412. ! :t60f・11"" 1,.

There is a possibility that machining accuracy cannot be achieved.

In addition, to determine the positional relationship between the fixed scroll 1 and the orbiting scroll 2, an Oldham ring key (or keyway) 5 is provided on the frame 4 side, so the key (or keyway) 5A of the frame itself must be machined. It needs to be highly accurate. Since the key 5A of the frame 4 and the groove 3A provided on one end face of the Oldham ring 3 are fitted, perpendicularity accuracy of the key groove 3A is required. Furthermore, the orbiting scroll 2 is inserted into the key groove 3B provided on the other end face of the Oldham ring 3.
The positions of the fixed scroll 1 and the orbiting scroll 2 are accurately determined for the first time by inserting the key 5B provided in the. In this way, the positioning of both scrolls 1.2 requires double positioning of the frame 4 and Oldham ring 3, and of the Oldham ring 3 and orbiting scroll 2.
In addition to machining each key 5A, 5B and keyway 3A, 3B, assembly must be performed on a high-precision I set, and a jig is also required, which significantly increases the number of man-hours and production costs. There are drawbacks.

The present invention aims to eliminate the above-mentioned drawbacks, and a set of keys or keyways are provided on the base of the fixed scroll and on the back of the end plate of the orbiting scroll so as to be perpendicular to each other, and one set of keys or keyways are provided on the bottom of the fixed scroll and on the back of the end plate of the orbiting scroll, and The present invention is characterized in that two sets of key grooves or keys are provided on the side end face so as to face the two sets of keys or key grooves, respectively.

Embodiments of the present invention will be described below with reference to the drawings.

Among the reference numerals shown in FIGS. 4 to 7, the same reference numerals as those shown in FIGS. 1 and 2 indicate the same or corresponding parts.

In Figs. 4 to 6, 1 is a fixed scroll consisting of an end plate IA and a spiral wrap IB and fixed to a frame 4, and a set of Oldham ring keys 5C are provided in the radial direction on the end plate IA. It is being Reference numeral 2 denotes a rotating frame consisting of two end plates and a spiral wrap 2. On the back of the two end plates, a set of Oldham ring keys 5B are provided in the radial direction, and this key 5B is interchangeable with the key 5C. It is set perpendicular to. The two mirror plates have a notch 2C through which a key 5C provided on the fixed scroll 1 can be played.
, it is possible to prevent the orbiting scroll 2 from hitting the key 50 of the fixed scroll even if the orbiting scroll 2 performs an orbiting motion. The fixed scroll key 5C is also formed higher than the orbiting scroll key 5B so that when both scrolls 1 and 2 are combined, the keys 5C and 5B provided on both scrolls are at the same height. Reference numeral 3 designates an Oldham ring having two sets of keyways 3B and 3C provided in the radial direction so as to be perpendicular to each other on one side end surface. Other structures are first
Since it is the same as the conventional example shown in the figure, and the compression principle and operation are also the same, the explanation will be omitted.

In another embodiment shown in FIG. 7, a set of protrusions 3D are provided on the Oldham ring 3 in the radial direction, and a key groove 3C is provided in this protrusion 3D into which a key 5C provided on the identification scroll 1 enters. be. This configuration has the advantage that the Oldham ring 3 can be made smaller and lighter.

As explained above, according to the present invention, the machining of keys or key grooves on large frames, which was extremely difficult to process with high precision as in the past, is abolished, and the key or key groove can be simply machined on the fixed scroll. That's fine. Furthermore, by machining a key or keyway on one end face of the Oldham ring, the trouble of machining both end faces of the Oldham ring using conventional jigs has been simplified, improving both machining and assembly accuracy. It is possible to improve the performance and reduce the number of man-hours, as well as to facilitate assembly management.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional scroll compressor, and Figure 2 (a
) to (C) are perspective views of the orbiting scroll, Oldham ring, and frame in the same compressor; A cross-sectional view showing an example, FIG. 5(a) is taken along the line X-X in FIG.
The arrow view, Fig. 5(b) is a side view of the same (a), and Fig. 6(a)
) to (c) are perspective views of a fixed scroll, an orbiting scroll, and an Oldham ring used in this embodiment (FIG. 4), and FIG. 7 is a perspective view of another embodiment according to the present invention, that is, X in FIG.
- This is a diagram corresponding to the X arrow view. 1...Fixed scroll, IA...End plate, 5C, 5B
...Key, 2...Orbiting scroll, 2 people...End plate, 2C...Notch, 3...Oldham ring, 3B,
3C...Keyway. 5 χ 1 Figure 5B Figure 2 (Kun (,e,)l3 (Q) (Ku) (Jun sword (1) I device 130°T 4 Figure 5 Figure (phantom (7) lΔ

Claims (1)

[Claims] In a scroll-type fluid machine comprising a fixed scroll and an orbiting scroll each having a wrap provided vertically on the end plate, and an Oldham ring for preventing rotation of the orbiting scroll, one is provided on the end plate of the fixed scroll and the back of the end plate of the orbiting scroll, respectively. Two sets of keys or key grooves are provided so as to be orthogonal to each other, and two sets of key grooves or keys are provided on one end surface of the Oldham ring so as to face the two sets of keys or key grooves, respectively. Features a scroll fluid machine.