JPH064068Y2 - Multi-cylinder type rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a fastening structure for adjacent cylinders in a multi-cylinder type rotary compressor.

[Prior Art] As a fastening means of adjacent cylinders in a multi-cylinder type rotary compressor, connection by through bolts or connection of adjacent end faces can be considered, but consider weight reduction after assembly and clearance management inside the cylinder. And the latter connecting means of the adjacent end faces is more advantageous.

4 and 5 show a conventional multi-cylinder type rotary compressor disclosed in Japanese Utility Model Laid-Open No. 57-174788, in which (1) is an eccentric shaft driven by an electric motor, and (2a ) (2
b) is the compression chamber concentric with the center of rotation of this eccentric shaft (1)
(4a) (4b) forming cylinder, (3a) (3b) is the eccentric shaft
A rolling piston that is fitted to (1) and rotates eccentrically along the inner walls of cylinders (2a) and (2b), (5a) and (5b) are vanes that divide each compression chamber into a high pressure chamber and a low pressure chamber, (6a) (6b) ) Is a side housing that hermetically seals one end surface of the cylinder (2a) (2b), (7) is a central partition plate that separates two adjacent cylinders (2a) (2b), (8a) (8b) Is a spring for pressing each vane, and (9) is a connecting bolt for fastening the side housing and the cylinder and the partition plate and the cylinder.

As described above, in the conventional multi-cylinder type rotary compressor,
As shown in the figure, the partition plate (7) and the cylinders (2
a) Flange section on each cylinder specially for fastening (2b)
(10) is provided to shift the fastening position of the side housing and the cylinder from the fastening position of the partition plate and the cylinder, and to fasten them by overlapping the end faces of the adjacent cylinders.

[Problems to be solved by the invention]

Since the conventional multi-cylinder type rotary compressor is configured as described above, the distance from the center position of the flange part (10) where the partition plate and the cylinder are fastened to the center part of the compression chamber in the cylinder becomes large. As a result, the sealability between the partition plate and the cylinder end surface is weak, and therefore compressed gas easily leaks from the joint surface, and the overall shape after assembly is increased by the amount of the flange portion.

Also, by providing a through hole from the end face of the side housing through the wall of the cylinder to the partition plate and fastening the side housing, cylinder and partition plate through bolts, the distance between the fastening part and the center of the compressor can be improved. Although it may be possible to reduce the size, in this case, the side housing and the cylinder, the cylinder and the partition plate, and the fastening surface are increased, and the length of the connecting bolt is also increased, so that there is a disadvantage that the sealing performance deteriorates due to the extension of the bolt. .

It is an object of the present invention to obtain a multi-cylinder type rotary compressor which eliminates the fastening flange portion causing the above problems and has a good sealing property.

[Means for solving problems]

In the case of this invention, the embedding counterbore hole of the bolt head of the connecting bolt for fastening both cylinders and the partition plate is communicated with the through hole provided in the end surface of one side housing, and abuts on this side housing. It is provided on one side of the cylinder.

[Action]

In the case of this invention, one side surface of one cylinder is provided with a counterbore for embedding the bolt head of the connecting bolt, and the connecting position of the connecting bolt is brought close to the center of the compression chamber in the cylinder.
Since the length of the bolts is also shortened, the adhesion between the cylinder and the partition plate will be more effective.

〔Example〕

FIGS. 1, 2 and 3 show an embodiment of a multi-cylinder type rotary compressor of the present invention. The same parts as those of the conventional one are designated by the same reference numerals, and the duplicated description thereof will be omitted. However, in the case of the present invention, in one side housing (6b) on the tightening side, the bolt (9) for connecting the central partition plate (7) and the adjacent cylinder (2a) on the opposite side is connected. Bolt head (9
a) A larger through hole (11) is provided, and similarly, one cylinder (2b) on the tightening side is also provided with a spot facing for burying the bolt head (9a) of the same diameter that communicates with this through hole (11). The feature is that the hole (12) is provided. By doing this,
The flange for fastening is excluded from the cylinder.

Moreover, as shown in FIG. 1, the counterbore hole (12) of the cylinder (2b) communicated with the through hole (11) of the side housing (6b).
The counterbore depth of is longer than the fastening part of the bolt (9), and the fastening length of the cylinder (the length to receive the compressive load by the bolt) is shortened.

[Effect of device]

Since the multi-cylinder type rotary compressor of the present invention is constructed as described above, the fastening position by the connecting bolt becomes closer to the center of the compression chamber in the cylinder, and the length of the bolt becomes longer. In that case, the adhesion force between the partition plate and the cylinder end surface at the time of fastening becomes effective, so that gas leakage from the part is eliminated, and the compressor after assembly can be made compact. .

And, the counterbore hole for embedding the bolt head of the connecting bolt,
Since the counterbore depth is provided on one side of the cylinder longer than the bolt fastening part, and the fastening length of the cylinder (length to receive compressive load by the bolt) is short, the inside is hollow and the sliding body is inside. It is possible to obtain an excellent multi-cylinder type rotary compressor which can prevent the contraction of the cylinder itself holding the cylinder and can secure a minute gap.

[Brief description of drawings]

FIG. 1 is a front view showing a cross section of a main part showing an embodiment of a multi-cylinder type rotary compressor of the present invention, FIG. 2 is a plan view showing a cylinder on a tightening side, and FIG. FIG. 4 is a plan view showing a side housing to be abutted, FIG. 4 is a front view showing a conventional multi-cylinder type rotary compressor, FIG. 5 is a vertical sectional view of FIG. 4, and FIG. 6 is a conventional tightening side. FIG. 3 is a plan view showing the cylinder of FIG. In the figure, (2a) and (2b) are cylinders,
(7) is a partition plate, (9) is a connecting bolt, (9a) is a bolt head,
(12) indicates a counterbore. In the other figures, the same reference numerals indicate the same or corresponding parts.

Front page continuation (72) Inventor Sei Ueda 3-18-1, Oka, Shizuoka-shi, Shizuoka Mitsubishi Electric Corporation Shizuoka Factory (72) Inventor Taiichi Kobayakawa 3--18-1, Oka, Shizuoka-shi, Shizuoka Electric Machinery Co., Ltd. Shizuoka Works (56) Bibliography Sho 58-1790 (JP, U) JP 59-25880 (JP, B1)

Claims (1)

[Scope of utility model registration request] 1. A multi-cylinder type rotary compressor in which cylinders are abutted on both sides of a partition plate and side housings are abutted on both outer end faces of the partition plate and these are fastened with bolts, and the both cylinders are fastened. The embedded counterbore hole of the bolt head of the connecting bolt communicates with the through hole provided in the end surface of the one side housing, and the one side surface of the cylinder abutting this side housing has a counterbore depth of the bolt fastening portion. A multi-cylinder type rotary compressor characterized by being installed longer.