JPS6219958B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compressor assembly method in which a cylinder is fitted into a compressor case and the case and cylinder are fixed.

In the assembly work of a compressor, there is a step of fitting a cylinder into a cylindrical case and fixing the case and the cylinder.

Conventionally, methods such as shrink fitting, press fitting, and screwing have been used in the process of fixing the case and the cylinder. However, according to these methods, there is always some degree of loosening in the case of shrink fitting or press fitting, so the cylinder positioned within the case may shift during transportation to the next process, which may impair assembly accuracy. This will lead to a decline.
In addition, in the case of screw fastening, it is necessary to drill holes in the case and also form screw holes in the cylinder, which requires a lot of time and effort to process and screw, resulting in very poor workability. The tightening moment generated during screw tightening may cause the positioned cylinder to shift within the case, making it impossible to position the cylinder with high precision.

This invention was made based on the above circumstances, and its purpose is to provide a method for assembling a compressor that enables efficient and highly accurate fixation of a case and a cylinder fitted into the case. It is about providing.

Hereinafter, a case will be described in which an embodiment of the present invention is applied to an assembly process of a rotary compressor shown in the drawings. The compressor shown in Figure 1 has a cylindrical case 1.
has. A cylinder 2 is positioned and fixed at one end inside the case 1 as described later. This cylinder 2 has heads 3a and 3b fixed to its upper and lower end surfaces, and a rotating shaft 5 having a piston (not shown) integrally formed at one end and a rotor 4 fitted at the other end. A piston formed in the form of a piston is rotatably inserted into the cylinder 2 so as to function as a rotary compressor, and is vertically projected from an upper head 3a. The cylinder 2 thus constructed is placed on a mounting plate 7 having a recess 6 formed in the upper surface 7a with the lower head 3b inside the recess 6. Next, an annular spacing ring 8 having the same outer diameter as the cylinder 2 is placed on the upper surface of the cylinder 2, and the inner diameter is slightly larger than the rotor 4 at the upper end of the spacing ring 8. An annular stator 9 having the same outer diameter as the spacing ring 8 is placed with the rotor 4 inserted therein. At this time, the gap G between the outer circumferential surface of the rotor 4 and the inner circumferential surface of the stator 9 is made uniform, that is, the rotating shaft 5
A spacer 10 is inserted into the gap G to eliminate vertical inclination. That is, this spacer 1
0 has a bottomed cylindrical shape with a wall thickness corresponding to the gap G and an inner diameter slightly larger than the outer diameter of the rotor 4, and the peripheral wall is formed into the gap G so that the rotor 4 is housed inside. Insert and provide. Note that the spacer 10 is provided with a knob 11, and this knob 11
is provided with a protrusion 11a that fits into the hole 4a of the rotor 4, and the center of the spacer 10 is positioned with respect to the center of the rotor 4 by fitting the hole 4a and the protrusion 11a.

Next, the case 1 is heated and expanded, and the cylinder 2, spacer 8, and stator 9 are shrink-fitted inside the case 1. At this time, if the cylinder 2 is lowered until the lower end surface comes into contact with the upper surface 7a of the mounting plate 7,
The cylinder 2 is positioned in the axial direction within the case 1. After the cylinder 2 is fitted into the case 1 and positioned in this manner, a laser oscillator (not shown) is activated, and the laser beam L output from the laser oscillator is transmitted through an optical system such as a prism (also not shown). If you divide it into multiple parts, for example three parts, and simultaneously irradiate the parts of the outer peripheral surface of the case 1 corresponding to the height of the cylinder 2 at 120 degree intervals,
The portion of the case 1 irradiated by the laser beam L and the portion of the cylinder 2 corresponding to this portion are melted, and the case 1 and the cylinder 2 are fixed by welding. At this time, the laser beam L has a high energy density, so welding can be performed in a short time, and the range of heat affected by the irradiation of the laser beam L is smaller than that of other welding methods.
Since the cylinder 2 is not thermally deformed, both can be fixed efficiently and without reducing the positioning accuracy of the cylinder 2 due to thermal deformation.

After that, remove the spacer 10 and remove the case 1.
By fixing mirror plates (not shown) to both ends of the
This completes the assembly of the compressor.

In addition, instead of simply making the spacer inserted into the gap G between the stator 9 and the rotor 4 into a cylindrical shape with a bottom, the wall thickness of this spacer is made thinner than the gap G, and the outer peripheral surface of the spacer is made thinner than the gap G. Protrusions extending along the axial direction may be provided at predetermined intervals, and the thickness of the portion where the protrusions are provided may be approximately the same thickness as the gap G.

As described above, in the present invention, after a cylinder is fitted into a case of a compressor, a spacer is inserted into a gap between a stator and a rotor to position the rotor, and then a plurality of The case and the cylinder are welded and fixed by irradiating a laser beam onto the location. Therefore, the case and the cylinder can be easily and reliably fixed. Furthermore, since the rotor positioned by the spacer does not shift, the rotor and the cylinder integrated with the rotor can be assembled with high precision via the rotation shaft.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory diagram showing a cross-sectional view of the cylinder positioned in the case, and FIG. 2 is an explanatory diagram showing the state in which the outer peripheral surface of the case is irradiated with a laser beam. be. 1...Case, 2...Cylinder, 4...Rotor, 5...
Rotating shaft, 9... Stator, 10... Spacer, L... Laser beam.

Claims (1)

[Claims] 1. A step of placing a case with a cylinder at one end at a predetermined location, and a process between a rotor fitted on a rotating shaft protruding from the cylinder and a stator provided at the other end of the case. a step of positioning the rotor by inserting a spacer into the gap; and a step of welding and fixing the case and the cylinder by irradiating a laser beam to multiple locations on the outer peripheral surface of the case with the rotor positioned. A method for assembling a compressor, comprising: