JPS62251490A - Hollow rotor for rotary compressor and manufacture thereof - Google Patents

Abstract

PURPOSE:To reduce the weight by splitting a rotor into more than two pieces, then boring the inside thereof, thereafter combining and integrating to form a hollow section. CONSTITUTION:A shaft 2 is splitted into two pieces 2a, 2b which are formed with spigot sections 16, 17 for fitting respectively to rotors 1a, 1b. A rotor 1 is splitted into two pieces 1a, 1b which are formed with mutually fitting spigot sections 12, 13 and spigot sections 14, 15 for fitting to said spigot sections 16, 17. Then they are integrated to form a hollow section 10. Consequently, the weight is reduced.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a rotor for a rotary compressor.

More specifically, the rotor is divided into two or more pieces, the insides of which are bored out, and then combined to form a cavity, which are then welded together using a laser or electron beam to form a single piece, resulting in a hollow rotor and a lightweight rotor. It relates to its manufacturing method.

Conventional technology and problems There are two types of compressors: the reciprocating type, in which a piston moves reciprocatingly within the cylinder chamber, and the rotary type, in which the rotor rotates eccentrically within the cylinder chamber. In comparison, the rotary type is widely used because it is smaller, lighter, and has a simpler configuration.

The rotary compressor is shown in Figures 5 and 6.

Cylinder having a cylindrical space inside8. A shaft 2 having a rotor 1 whose center is eccentric to the center of a cylinder chamber 3 formed by side plates 9 sealing both sides of a cylinder 8.
It consists of a vane 5 that slides into a vane sliding groove 4 provided in the rotor 1 and comes into sliding contact with the outer peripheral surface of the cylinder.The vane 5 is moved out by eccentrically rotating the rotor 1 within the cylinder chamber with the rotation of the shaft 2. The gas in the cylinder chamber 3 taken in through the intake hole 6 partitioned by the vane 5 is compressed, and the compressed gas is discharged to the outside of the cylinder chamber 3 through the discharge hole 7.

In recent years, as performance has improved, there has been a strong demand for lighter weight of such compressors. As a conventional technology, for example, the third
As shown in Fig. 4 and Fig. 4, the rotor 1 is made of sintered alloy and has a cavity 10 to reduce weight, but a shaft part 11 for press-fitting the shaft 2 into the rotor 1 is provided in the center. In addition, rotors manufactured using this method have many problems in reducing the weight of the rotor, such as the fact that internal machining is not possible, making it difficult to hollow out the center interior, and wasteful weight. The reality is that no weight reduction has been achieved.

Means for Solving the Problems The present invention has been made by paying attention to the problems of the conventional technology, and has been developed by dividing the rotor into two or more parts and boring the inside of the rotor in advance to reduce the weight. The present invention is a combination hollow rotor that is combined to form a cavity and is made into an integral structure by laser welding or electron beam welding, and a method thereof.

The rotor is divided into two or more pieces, each piece is roughly cut leaving a finishing allowance, and the inside is hollowed out. At this time, each joint surface has a tightening margin of 0.01 with a part of the inlet installed.
Finish with a thickness of ~0.05mm. These are press-fitted and combined using a portion of the inlet as a reference, and after degreasing, they are welded together using a laser or an electron beam to form an integral structure. At this time, when processing the sliding groove of the vane insertion part after welding, the cavity will be in a sealed state, and the internal air may blow out from the welding surface due to thermal expansion due to welding, resulting in poor welding. Make a hole. Also, if the sliding groove is processed before welding, the sliding groove should be masked during welding.

Perform finishing work after welding.

Laser or electron beam welding causes almost no thermal distortion, so it is sufficient to leave a finishing allowance of about 0.1~Q, 2m++i, and finishing is easy and welding to other parts will not have any negative effects. In this way, it becomes possible to manufacture a lightweight combination rotor with a hollow interior.

Example As shown in FIG. 1, the shaft 2 is made up of two pieces 2a, 2.
Inlet parts 16 and 17 are formed which are divided into parts b and fit into the rotors la and lb, respectively. The rotor 1 is divided into two pieces 1a and 1b and fitted into each piece 12.
13 and a spigot part 14.15 into which the spigot parts 16.17 of the shafts 2a, 2b fit. These were rough-machined leaving a machining allowance of 0.1 to 0.2III+, and a part of the spigot was machined with an interference of 0.01 to 0.03 mm, and these were press-fitted using the part of the spigot as a reference to form an integral piece. At this time, an air vent hole was made in the part where the sliding groove 4 was to be processed in a later process.

1, L, 1. After degreasing with trichloroethane, welding was performed with an electron beam, and finishing was performed after welding.

As a result of an investigation of the hollow rotor obtained by the above manufacturing method, it was found that the welding condition was good and the weight was approximately 10% lighter than a conventional product of the same size. Furthermore, as a result of conducting the following strength test, it was confirmed that the strength was also sufficient.

As for the strength test, a compression test and a torsion test were conducted using the following method.

(1) Compression test As shown in FIG. 7, the tip of the shaft 2b was compressed with a load W while the shaft 2a was held vertically with the shaft 2a facing down using a universal material testing machine. Compression test results.

It withstood a load of over 2000 kg and no abnormality was observed.

(2) Torsion test As shown in FIG. 8, the end of the shaft 2a was held so as not to rotate, and the end of the shaft 2b was twisted using a torque wrench. As a result of the torsion test, no abnormality was observed withstanding a force of 30 kg-am or more.

Next, as another embodiment shown in FIG. 2, the shaft 2 is press-fitted into the hollow rotor 1 without being divided, and after being welded and joined using a degreasing double electron beam, finishing processing is performed.

Effect By dividing the rotor into two or more pieces as in the present invention,
By boring in advance and assembling them to form a cavity, welding them together using laser or electron beams to form an integral structure, it is easy to obtain a hollow rotor.Compared to conventional products, it is comparable in strength and weight. The practical effects of reducing the weight of the rotary compressor and improving the efficiency of the rotary compressor are remarkable.

[Brief explanation of drawings]

Claims (2)

[Claims] (1) In rotor for rotary compressor, rotor 1
A hollow rotor characterized in that the rotor is divided into two or more pieces 1a, 1b, . (2) In rotor for rotary compressor, rotor 1
The hollow rotor is divided into two or more pieces 1a, 1b, . Production method.