JPH0637876B2 - Two-cylinder rotary compressor manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an improvement in a method for manufacturing a two-cylinder rotary compressor.

[Technical Background of the Invention and Problems Thereof] In a two-cylinder rotary compressor, two cylinders are arranged in series, a partition plate is interposed between the cylinders, and a main bearing is provided on a side portion of each cylinder. A sub-bearing is provided, each bearing receives a rotating shaft, and a roller rotating in each cylinder causes a compression operation.

By the way, as a method of manufacturing such a two-cylinder rotary compressor, there is a method as disclosed in Japanese Patent Publication No. 59-25880.

As shown in FIG. 3, first, the first cylinder a and the main bearing b are aligned as shown in FIG.
Then, the rotary shaft d and the first roller (not shown) are incorporated. Then, the same figure (b)
As described above, the middle partition plate e is aligned with the first cylinder a, and the second middle partition plate e is provided on the remaining side portion of the first cylinder a.
Secure with bolt f. After that, as shown in FIG. 7C, the second cylinder g is aligned with the partition plate e, the second cylinder g is fixed with the third bolt h, and the second cylinder g is fixed in the second girder g. Arrange rollers (not shown). Then, after fixing the sub bearing i to the second cylinder g with the fourth bolt j while aligning the auxiliary bearing i as shown in FIG. 7D, the valve cover k is moved to the first position as shown in FIG. The first and second cylinders a and g are fixed to the intermediate partition plate e to assemble the compressor section.

However, for such a partition plate e, the first cylinder a
In the manufacturing method of separately aligning and fixing the second cylinder g and the second cylinder g, since each alignment error is added to the intermediate partition plate e, the first cylinder a and the second cylinder g are separated from each other. It is difficult to set concentricity. Therefore, each cylinder a,
It is difficult to set the same side clearance at g, which may deteriorate volumetric efficiency and eventually lower the coefficient of performance. In addition, the method of separately fixing the first and second cylinders a and g to the intermediate partition plate e requires a large number of assembling steps, which impairs mass productivity and causes a high cost.

[Object of the Invention]

The present invention has been made in view of these problems, and an object thereof is to provide a method for manufacturing a two-cylinder rotary compressor that can be assembled with high precision and with a small number of assembly steps.

[Structure of Invention]

That is, according to the present invention, first, the three members of the first cylinder, the partition plate and the second cylinder are aligned at the same time, and thereafter, they are simultaneously fixed by the fastening bolts penetrating each other. By fixing the bearing to the side portion of each cylinder with a connecting bolt that is screwed only to the cylinder that is the installation portion, the number of assembly steps required for fixing is reduced, and the first cylinder and the second cylinder are fixed. Be able to concentrically and accurately assemble.

Example of Invention

The present invention will be described below based on an embodiment shown in FIGS. 1 and 2. FIG. 2 shows a schematic structure of a two-cylinder rotary compressor, where 1 is a hermetically sealed case, 2 is an electric motor portion provided on the upper side in the hermetically sealed case 1, and is composed of a stator 2a and a rotor 2b. This is a compressor section provided on the lower side in the closed case 1. Compressor section 3
Installs the first cylinder 5 and the second cylinder 6 on both sides of the middle partition plate 4 so as to sandwich the middle partition plate 4, and mainly on the side part of the first cylinder 5 arranged on the upper side. The bearing 7 is attached to the side portion of the second cylinder 6 arranged on the lower side, and the sub-bearings 8 are attached to form the outer shell. And
The rollers 9a and 9b are provided in the first and second cylinders 5 and 6, respectively.
Eccentrically rotatably arranged, and the cylinder 5 and
Blades 10b for partitioning the interior of 6 into a suction side and a compression side are mounted so as to be able to move forward and backward.

The rollers 9a and 9b in the cylinders 5 and 6 and the rotor 2b of the electric motor unit 2 are connected by a rotary shaft 11, and the rotational force generated in the electric motor unit 2 is used as a drive source to drive the rollers 9a and 9b.
By driving b, the compression operation can be performed respectively. In addition, 12 indicates the main bearing 7 and the closed case 1
Bracket for fixing to the peripheral side wall of the cylinder, 13 is a suction pipe connected to the suction side of the first cylinder 5, 14 is a discharge pipe connected to the head wall of the closed case 1, and 15 is the first cylinder. Reference numeral 5 denotes a valve cover (which also serves as a silencer) provided on the side of 5, and 16 denotes a valve cover (which also serves as a silencer) provided on the side of the second cylinder 6.

The method of the present invention is applied to the manufacture of the compressor unit 3, and the procedure of the manufacturing method is shown in FIGS. 1 (a) to 1 (c).

Next, assembling of the compressor unit 3 which is the main part of the present invention will be described with reference to FIGS. 1 (a) to 1 (c).

First, using a jig (not shown), the first cylinder 5,
The first partitioning plate 4 and the second cylinder 6 are aligned at the same time, and the three members are passed through the first cylinder 5, the middle partitioning plate 4, and the second cylinder 6 as shown in FIG. The bolts 20 (fastening bolts) are simultaneously fixed. Then, the rotary shaft 11 is inserted into such an integrated body to align it with the integrated body, and then the roller 9b is incorporated into the eccentric portion 11a located in the second cylinder 6. Then, the sub-bearing 8 in which the valve cover 16 is previously mounted is inserted into the end of the positioned rotary shaft 11 on the second cylinder 6 side, and the sub-bearing 8 is aligned with the rotary shaft 11. After this,
As shown in FIG. 1B, the second bolt 21
The auxiliary bearing 8 is fixed by screwing a (connection bolt) toward the second cylinder 6. Next, when the fixing of the sub bearing 8 is completed, the roller 9a is assembled in the eccentric portion 11b located in the first cylinder 5. Then, as in the case where the auxiliary bearing 8 is attached, the main bearing 7 with the valve cover 15 previously attached is arranged at the end portion on the side of the first cylinder to align the rotary shaft 11. Then, as shown in FIG. 1 (c), the third bolt 22 (coupling bolt) is screwed from the side toward the first cylinder 5 and the main bearing 7 is fixed. Will be assembled.

Therefore, in manufacturing the compressor unit 3, first, the first cylinder 5, the intermediate partition plate 4, and the second cylinder 6 are concentrically fixed to each other, so that a centering error found in the related art occurs. It is possible to eliminate the occurrence of an error that is added.

However, with the work of fixing the three people, the first
The cylinder 5 and the second cylinder 6 can be accurately fixed, that is, the side clearances of the first cylinder 5 and the second cylinder can be easily set to be the same. As a result, it is possible to prevent deterioration of the volumetric efficiency and decrease of the coefficient of performance in the compressor unit 3. Moreover, since the bearings 7 and 8 are fixed to the integrated cylinders 5 and 6 and the intermediate partition plate 4, the bearings 7 and 8 can be easily aligned with the cylinders 5 and 6.

Moreover, since the first cylinder 5, the intermediate partition plate 4, and the second cylinder 6 are fixed together, the number of assembling steps is smaller than that in the case where each cylinder is fixed to the conventional intermediate partition plate. This brings an effect that mass productivity and cost can be reduced. In particular, the number of bolts and the number of types can be reduced in the case of fixing the three members using bolts, as compared with the conventional method (method of separately fixing the cylinder to the partition plate). In addition, the means for fixing the bearings 7, 8 using the bolts 21, 22 that do not penetrate the cylinder has the advantage that the deformation of the cylinder due to the screwing of the bolts 21, 22 is small.

〔The invention's effect〕

As described above, according to the method of the present invention, the concentricity of the first cylinder and the second cylinder can be easily obtained. Moreover, the fixing work can be reduced as compared with the conventional one in which each cylinder is fixed to the partition plate.

As a result, the side clearance between the first cylinder and the second cylinder can be easily and accurately set, and at the same time, the number of assembling steps can be reduced and mass productivity and cost can be reduced. . Moreover, since the bearing is fixed by the connecting bolt that does not pass through the cylinder serving as the installation portion, the deformation of the cylinder due to screwing can be reduced.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
(A), (b), (c) are front sectional views showing the steps of the manufacturing method of the compressor in sequence, and FIG.
3 (a), (b), (c), (d), and (e) are front views sequentially showing the steps of a conventional method for manufacturing a two-cylinder rotary compressor. 4 ... Intermediate partition plate, 5 ... First cylinder, 6 ... Second cylinder, 7,8 ... Bearing, 20 ... Bolt (fastening bolt) 21,22 ... Bolt (connecting bolt) ).

Claims (1)

[Claims] 1. A partition comprising a partition plate between the first and second cylinders, and bearings on both sides of the cylinder.
In the method of manufacturing a cylinder rotary compressor, the three of the first cylinder, the partition plate and the second cylinder are used.
After simultaneously aligning the two people, fasten them with fastening bolts that pass through each other at the same time, and then fix the bearings with connecting bolts that are screwed only to the cylinders that are the installation parts on the side of each cylinder. A method for manufacturing a two-cylinder rotary compressor, characterized in that