JPH0615801B2 - Method for manufacturing scroll fluid machine - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for manufacturing a scroll fluid machine used for a compressor, an expander, a pump, or the like.

[Technical background of the invention and its problems]

The principle of operation of the scroll compressor will be described with reference to Fig. 1. When two scrolls (1) and (2) that are scrolls are arranged in a mutually meshed state with different angles, both scrolls
Between (1) and (2), a limited space (3) extending from the contact portion to the contact portion is formed. Now, with respect to one spiral plate (1) with respect to the other spiral plate (2), the center O'of one spiral plate (1) has a radius O-O around the center O of the other spiral plate (2). If the spiral plate (1) is moved so that it revolves around with ′, the volume of the limited space (3) gradually decreases.

From the state of FIG. 1 (A), it is shown in FIG. 1 (B) that the revolution angle of the spiral plate (1) is 90 °, and in FIG. The same figure (D) is shown, and the volume of the space (3) thus limited gradually decreases. Rotated 360 °
In (A), both spaces move to the central part and are connected to each other.
As shown in (B), (C), and (D) of the figure, which are moved by 90 °, the space is narrowed to almost zero in the figure (D). During this time, the outer space that has begun to open in FIG.
Move from (A) to (A) and create a closed space that takes in a new fluid.

Therefore, sealed disk-shaped side plates are provided at both axial ends of the spiral plates (1) and (2), and a discharge hole as shown by (4) in Fig. 1 is provided at the center of one side plate. If so, the fluid taken in on the radially outer side is compressed and discharged from the discharge hole (4).

By the way, conventionally, the spiral plates (1) and (2) have been obtained by cutting the cast material by an end mill using a value control (NC) machine tool. However, the stock removal from the cast material is usually as large as 1.5 mm, which results in a long production time and low production efficiency. Not only that, as the tool wears during cutting, the tool management for maintaining the predetermined processing accuracy becomes extremely complicated, and the processing accuracy that can be achieved is not sufficient, which is a barrier to improving the performance of the scroll fluid machine. Was becoming.

[Object of the Invention]

It is an object of the present invention to provide a method for manufacturing a scroll fluid machine that is highly efficient and highly accurate and has wear resistance.

[Outline of Invention]

After molding the moving blade portion and the stationary blade portion with, for example, plastic, a metal coating is formed on at least the surface of the spiral plate of these blade portions, and finishing is performed by removing a part of the metal coating portion. It is a thing.

Example of Invention

 An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 2 shows a scroll fluid machine manufactured by the manufacturing method of this embodiment. This scroll fluid machine is
A cylindrical container (5), a shaft (7) that is axially supported by the frame (6) in the container (5) coaxially with the container (5), and a ring is installed in the middle of the shaft (7). Rotor (8) and the rotor in the container (5)
The motor is fixed together with the rotor (8) so as to surround (8).
The stator (10) that forms the (9) and drives the shaft (7) to rotate,
A moving blade portion (12) eccentrically fitted to the head portion (7a) formed at the upper end of (7) and connected to the frame (6) via an Oldham coupling (11), and a container. (5) A stationary vane part that is vertically installed on the ceiling part and fits into sliding contact with the moving vane part (12) to form a plurality of compression spaces (13) ... And has a discharge hole (14a) in the center part. (1
4), and the working fluid provided on the side of the container (5)
The suction pipe (15) for supplying (13) ... and the working fluid compressed in the compression space (13) provided in the center of the ceiling of the container (5) and discharged through the discharge hole (14a). Discharge pipe (1
6) consists of Then, the lubricating oil (17) is injected into the bottom of the container (5), and this oil passes through the oil groove (18) engraved on the outer peripheral surface of the shaft (7) and is supported by the shaft support. Are being supplied to the ranks. Further, the moving blade portion (12) is provided with a disk-shaped end plate (19) and an end plate (19). 20) and. Then, the rotor blade portion (12) is provided so as to perform an orbital motion while preventing rotation by the Oldham coupling (11). On the other hand, the vane part (14)
Is composed of a disc-shaped end plate (21) and a spiral plate (22) which is vertically provided integrally with the lower surface of the end plate (21) and integrally formed to have an involute curve and which has a spiral shape.

Therefore, the moving blade portion (12) and the moving blade portion (14) are formed by using a plastic material using a mold by an injection molding method, a compression molding method, or a transfer molding method. Therefore, the third
As shown in the figure, the spiral plates (20) and (22) have trapezoidal cross sections with a draft on both sides. Then, the moving blade part
A metal coating (23) of, for example, chromium (Cr), nickel (Ni), copper (Cu) or the like is formed on the entire surfaces of (12) and the vane portion (14) by P, V, D, such as by sputtering or vapor deposition. (Physical Vapor Depositio
n) or C. using vapor phase growth with chemical reaction in high temperature gas. V. D. (Chemical Vapor Deposition) (see FIGS. 3 and 4). Then, the moving blade portion (12) and the stationary blade portion (14) on which the metal coating (23) is formed are NC.
By cutting, the portions shown by diagonal lines (L) in FIG. 4 are removed to form a draft.

Thus, the moving blade portion (12) and the stationary blade portion (14) obtained in the present embodiment have a smaller machining allowance as compared with the case where they are made of a metal casting member, so that the processing time is short and the manufacturing is highly accurate. can do. Therefore, it becomes suitable for mass production. Furthermore, since the rotor blade part (12) is made of a plastic material, high speed rotation of 10,000 rpm or more is possible.

In the above embodiment, the moving blade portion (12) and the stationary blade portion (1
Although the processing of 4) is performed by cutting, it may be processed by lapping as shown in FIG. That is, the metal tool (25) having the spiral plate (24) is placed on the cylindrical multi-degree-of-freedom table (26). This table (2
In 6), a sphere (27) is arranged at the bottom so that it can move on the base (28). Also this table
The outer peripheral surface of the (26) is surrounded by the outer wall body (29), and the elastic body (30) is interposed between the outer wall body (29) and the table (26), and the table is formed. (26) is elastically supported so that it can freely move back and forth. And then the spiral plate
After applying the lapping agent on the surface of (24), the spiral plate (24) of the moving blade part (12) is fitted and slidably contacted with the spiral plate (24). Then, the moving blade portion (12) is revolved while being vertically moved with respect to the tool (25). Then, the lapping pressure is induced by the elastic bodies (30), and the portions indicated by the diagonal lines (L) in FIG. 3 are removed. This can be done in the same way for the vane portion (14).

〔The invention's effect〕

The present invention has a smaller machining allowance as compared with the case where the stationary vane portion is made of a metal casting material, so that the machining time is short, the machining accuracy can be improved, and the invention is suitable for mass production. Moreover, since the moving blade portion is made of a plastic material, it can rotate at a high speed of 10,000 rpm or more, and the performance as a fluid machine can be improved.

[Brief description of drawings]

1 (A), (B), (C), and (D) are explanatory views of the operation of the scroll fluid machine, and FIG. 2 is a diagram showing the overall configuration of the scroll fluid machine manufactured in one embodiment of the present invention. Sectional view for doing the third
FIG. 4 and FIG. 4 are cross-sectional views of a wing portion having a metal coating formed thereon, and FIG. 5 is a view showing finishing processing in another embodiment of the present invention. (12): moving blade part, (14): stationary blade part, (20): spiral plate (first −), (22): spiral plate (second −), (23): metal coating.

Claims (1)

[Claims] 1. A moving vane portion which is revolvingly driven in a state in which a spiral-shaped first spiral plate is projectingly provided and its rotation is restricted, and the first spiral blade.
And a stationary vane portion fixed to the moving blade portion, the moving blade portion being plastic-molded. A step of forming a metal coating on at least the first spiral plate and at least the second spiral plate of the stationary vane portion formed by plastic molding, and a step of removing a part of the metal covered portion and finishing the same. A method for manufacturing a scroll fluid machine, comprising: