JP2001065482A - Assembly method for rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately set a clearance formed by a rotor in each cylinder. SOLUTION: The assembly process of a double cylinder compressor comprises the steps of installing an upper cylinder 2 eccentrically with an upper bearing 4, installing a shaft 6 and an upper roller 7, and temporarily fixing a lower cylinder 3 to the upper cylinder 2 through an intermediate plate 1. In this state, dimensions D of the outer periphery of the shaft 6 and the inner periphery of the lower cylinder 3 along a specified direction sandwiching the center of rotation of the shaft 6 is adjusted to the dimensions based on the maximum dimensions A of the outer periphery of the shaft 6 sandwiching the center of rotation of the shaft and the outer periphery of the lower roller 8 measured beforehand. Then, the lower roller 8 is installed on the shaft 6, the lower bearing is installed on the lower cylinder 3, and a lower cylinder 3 side is closed. Thus, the position of the lower cylinder 3 relative to the lower roller 8 can be adjusted accurately based on the shaft 6 in the state of being installed on the upper cylinder 2. Also, the assembly work is performed by installing each part sequentially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a rotary compressor having a plurality of cylinders.

[0002]

2. Description of the Related Art Conventionally, rotary compressors have been used for refrigerators, air conditioners and the like. The rotary compressor is
A working fluid such as a refrigerant in a cylinder is directly compressed by a rotor provided therein. In recent years, a double cylinder having two sets of a cylinder and a rotor has been used because of its energy saving and excellent quietness. Cylinder compressors are widely used.

FIG. 6 is a view showing a main part of a double cylinder type compressor. The double cylinder type compressor has an upper cylinder 2 and a lower cylinder 3 fixed with a middle plate 1 interposed therebetween. I have. An upper bearing 4 is fixed to the upper cylinder 2, and a lower bearing 5 is fixed to the lower cylinder 3. A shaft penetrating the upper cylinder 2 and the lower cylinder 3 by the upper bearing 4 and the lower bearing 5. 6 are supported. An upper roller 7 and a lower roller 8, which are rotors, are fitted on the shaft 6 so as to be eccentric to the rotation center O on the long axis side of the shaft 6, and each of them is opened at the center of the upper cylinder 2. It is accommodated in the working chamber hole 2a and the working chamber hole 3a opening at the center of the lower cylinder 3.

[0004] In operation, the upper roller 7 and the lower roller 8 are rotated via the shaft 6 so as to be formed between the upper roller 7 and the lower roller 8 inside the upper cylinder 2 and the lower cylinder 3. The volume of the compression space is gradually reduced, and the working fluid supplied into the compression space is compressed. Therefore, in the double-cylinder compressor, when the upper roller 7 and the lower roller 8 minimize the volume of the compression space inside the upper cylinder 2 and the lower cylinder 3, they are formed between the upper cylinder 2 and the lower cylinder 3. It is important to set the dimensions L1 and L2 of the gap to be formed with high precision in order to increase the compression efficiency.

[0005] For this reason, the above-mentioned components are assembled by the following procedure. First, the upper cylinder 2 and the upper bearing 4 are eccentrically assembled by eccentrically fixing the centers of the upper cylinder 2 and the upper bearing 4 in a determined direction and by an amount corresponding to the clearance dimension L1, thereby forming an upper assembly part. Similarly, the lower cylinder 3 and the lower bearing 5 are eccentrically assembled to form a lower assembly part. The upper cylinder 2 and the upper bearing 4 and the lower cylinder 3 and the lower bearing 5 are also fixed by bolts. Next, after assembling the shaft 6 to the upper assembly, and assembling the upper roller 7 and the lower roller 8 to the shaft 6, the upper assembly and the lower assembly are sandwiched via the middle plate 1 so that the upper assembly and the lower assembly are located at predetermined positions. With bolts.

[0006]

However, in the above-described assembling method, after the shaft 6 is assembled to the upper assembly, the lower assembly separately assembled therefrom is finally combined, so that the upper cylinder is not assembled. Even if the gap formed by the upper roller 4 in the cylinder 2 can be set accurately, it is difficult to set the gap dimension L2 formed by the lower roller 5 in the lower cylinder 3 accurately at the same time.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and provides a method of assembling a rotary compressor capable of accurately setting a gap formed by each rotor in each cylinder. The purpose is to:

[0008]

In order to solve the above-mentioned problems, according to the present invention, the first and second cylinders fixed to each other and the first and second cylinders penetrate the interior of both cylinders, A shaft whose one end is supported by a bearing fixed to one cylinder, and a first and a second rotor mounted on the shaft with the center of rotation eccentric to compress a working fluid inside each of the two cylinders In the method for assembling a rotary compressor having, after assembling the shaft and the first cylinder via the bearing, while fixing the position of the second cylinder with respect to the first cylinder, When the position is fixed, the dimensions of the outer periphery of the shaft and the inner periphery of the second cylinder along a predetermined direction sandwiching the center of rotation of the shaft are measured in advance. And to adjust the maximum dimension based dimensions between the outer and the outer periphery of the second rotor of the shaft sandwiching the rotation center of Yafuto.

In such a method, the position of the second cylinder fixed to the first cylinder with respect to the second rotor is accurately adjusted with reference to the shaft assembled to the first cylinder. The assembling work is performed by sequentially assembling the parts.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart showing a procedure for assembling the main parts of the double-cylinder compressor shown in FIG. When assembling such a main part, first, the maximum dimension A (see FIG. 2) between the outer periphery of the shaft 6 and the outer periphery of the lower roller 8 sandwiching the rotation center O of the shaft 6 is measured and recorded (step). S1). Next, upper cylinder 2
After eccentrically assembling the upper bearing 4 and the upper bearing 4 (step S2), the shaft 6 is inserted into the upper bearing 4 and the upper roller 7 is assembled to the shaft 6 (step S3), and as shown in FIG. Then, the lower cylinder 3 is temporarily fixed to the upper cylinder 2 with the middle plate 1 sandwiched (Step S4).

Subsequently, the amount of eccentricity of the lower cylinder 3 (the working chamber hole 3a) with respect to the shaft 6 in the direction perpendicular to the reference line is adjusted (step S5). That is, as shown in FIG. 4, a center P1 of the working chamber hole 3a of the lower cylinder 3 and a communication hole formed continuously with the working chamber hole 3a and communicating the working chamber hole 3a with the working chamber hole 2a of the upper cylinder 2. A straight line that forms 90 ° with the line M connecting the center P2 of the base 31 with a predetermined reference line N
The dimension B between the outer circumference of the shaft 6 and the inner circumference 3b of the lower cylinder 3 along two directions symmetrical with respect to the reference line N,
While measuring C, the lower cylinder 3 is moved so that it has the same dimensions. Further, the amount of eccentricity of the lower cylinder 3 (the working chamber hole 3a) with respect to the shaft 6 in a predetermined direction along the reference line N is adjusted based on the previously recorded maximum dimension A (step S6). That is, FIG.
As shown in the figure, while measuring the dimension D between the outer circumference of the shaft 6 along the reference line N and the inner circumference 3b of the lower cylinder 3, the difference between the dimension D and the maximum dimension A, that is, the lower roller in the lower cylinder 3 The lower cylinder 3 is moved along the reference line N such that when the compression space 8 minimizes the volume of the compression space, the dimension L2 of the gap formed between them becomes a predetermined size.

After fixing the lower cylinder 3 to the upper cylinder 2 (step S7), the lower roller 8
And the lower bearing 5 is assembled to the lower cylinder 3 (step S8), thereby completing the assembling work.

According to such an assembling operation, the position of the lower cylinder 3 with respect to the lower roller 8 is adjusted with reference to the position of the shaft 6 assembled to the upper cylinder 2, so that the position can be adjusted accurately. it can. Therefore, not only the dimension L1 of the gap formed by the upper roller 4 in the upper cylinder 2 but also the dimension L2 of the gap formed by the lower roller 5 in the lower cylinder 3 can be set with high accuracy. In addition, assembling is performed by assembling each part sequentially as described above,
The product assembling line can be simplified, the productivity is improved, and the assembling work by a machine can be easily automated.

The specific procedure of the eccentric assembly of the upper cylinder 2 and the upper bearing 4 in step S2 described above may be performed by any procedure. do it. That is, the maximum dimension of the outer periphery of the shaft 6 and the outer periphery of the upper roller 7 sandwiching the rotation center O of the shaft 6 is measured and recorded in advance, and the same procedure as the position adjustment of the lower cylinder 3 described in step S5 is performed. After performing the position adjustment in the direction perpendicular to the predetermined reference line, the step size between the inner circumference of the upper cylinder 2 and the inner circumference of the upper bearing 4 becomes a dimension based on the stored maximum dimension. Thus, the upper cylinder 2 and the upper bearing 4 are eccentric along the reference line. According to this procedure, the upper cylinder 2
And the upper bearing 4 can be accurately positioned.

In the present embodiment, the case where the present invention is applied to a double cylinder type compressor has been described. However, the present invention is not limited to this, and three or more cylinders are connected between bearings supporting both ends of a shaft. The assembly method of the present invention can be adopted in other rotary compressors as described above. For example, first to third cylinders, and first to third cylinders
With the third rotor, when the second and third cylinders are sequentially positioned and fixed with respect to the first cylinder, the position adjustment of the second and third cylinders is performed by the lower cylinder in the present embodiment. By performing the same procedure as that described above, it is possible to accurately set the gaps formed by the second and third rotors in the second and third cylinders, and the same effect as the double-cylinder compressor can be obtained. can get.

[0016]

As described above, in the present invention,
The position of the second cylinder fixed to the first cylinder with respect to the second rotor is accurately adjusted based on the shaft assembled to the first cylinder. Therefore, in a rotary compressor having a plurality of cylinders, such as a double-cylinder compressor having two sets of cylinders and rotors, the gap formed by each rotor in each cylinder is accurately set. It becomes possible. In addition, since the assembling operation is performed by sequentially assembling the parts, the product assembling line can be simplified, the productivity can be improved, and the assembling operation by the machine can be easily automated.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an assembling procedure in a main part of a double-cylinder compressor showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing an assembled state of a shaft, an upper roller, and a lower roller.

FIG. 3 is a sectional view showing a state where a lower cylinder is assembled to an upper cylinder.

FIG. 4 is an explanatory diagram showing a method of adjusting the amount of eccentricity of a lower cylinder in a direction perpendicular to a reference line.

FIG. 5 is an explanatory diagram showing a method of adjusting the amount of eccentricity of a lower cylinder in a direction along a reference line.

FIG. 6 is a sectional view showing a main part of the double cylinder type compressor.

[Explanation of symbols]

 2 Upper cylinder (first cylinder) 3 Lower cylinder (second cylinder) 3b Inner circumference of lower cylinder 4 Upper bearing 6 Shaft 7 Upper roller (first rotor) 8 Lower roller (second rotor) N Reference line O Center of rotation

Claims (1)

[Claims] 1. A first and a second cylinder fixed to each other, and penetrating the interior of both cylinders,
A shaft whose one end is supported by a bearing fixed to the first cylinder, and first and second rotations mounted on the shaft with the center of rotation eccentric to compress the working fluid inside each of the two cylinders In the method of assembling a rotary compressor having a shaft, the shaft and the first cylinder are assembled via the bearing, and then the second cylinder is fixed in position with respect to the first cylinder. When the position is fixed, the dimensions of the outer periphery of the shaft and the inner periphery of the second cylinder along a predetermined direction sandwiching the center of rotation of the shaft are measured beforehand. A method for assembling a rotary compressor, wherein the dimension is adjusted based on the maximum dimension between the outer circumference and the outer circumference of the second rotor.