JPH0114786Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a rolling piston type multi-cylinder rotary compressor.

[Conventional technology]

As shown in FIG. 1, a conventional multi-cylinder rotary compressor has a motor 12 and first and second cylinders 3 and 4 fixed to the inner wall surface of a housing 1. The second cylinder 4 forms a cylinder chamber by the partition plate 9 and the lower bearing 8, and the crankshaft 2 has a first pin part 10 and a second pin part 11, and each pin A first rotor 5 and a second rotor 6 are loosely fitted into the parts 10 and 11.

In the multi-cylinder rotary compressor configured in this way, the crankshaft 2 is driven by the motor 12.
As the gas rotates, gas is sucked in through a suction pipe (not shown) into a cylinder chamber surrounded by first and second cylinders 3, 4, rotors 5, 6, upper bearing 7, partition plate 9, and lower bearing 8. The fluid is compressed by the change in volume of the fluid, and is discharged to the outside from the discharge pipe 18 through a discharge valve (not shown) and a space inside the housing 1. Normally, the eccentric directions of the first pin part 10 and the second pin part 11 of the crankshaft 2 are shifted by 180 degrees, and the gas is compressed twice for one rotation of the crankshaft 2.

[The problem that the idea attempts to solve]

By the way, in order to assemble the multi-cylinder rotary compressor as described above, the crankshaft 2 is divided into two parts, the pin part 11 is made a separate part from the crankshaft 2 and press-fitted during assembly, or the partition plate 9 is divided into two parts in the diametrical direction. It is necessary to divide it into two parts or to make the center hole diameter of the partition plate 9 larger than the diameter of the pin parts 10 and 11.
Dividing the crankshaft 2 into two makes it difficult to maintain concentricity of the crankshaft 2, and press-fitting the pin parts 10 and 11 into the pin part 1
0 and 11 are difficult to position in the circumferential direction relative to the crankshaft 2, dividing the partition plate 9 into two in the diametrical direction makes it difficult to maintain the flatness of the partition plate 9, and increasing the diameter of the center hole of the partition plate 9 makes it difficult to position the partition plate 9 in the diametrical direction. There were drawbacks such as gas leakage easily occurring from the gaps between 5 and 6 and the partition plate 9.

An object of the present invention is to provide a rolling piston type multi-cylinder rotary compressor that can eliminate the above-mentioned drawbacks.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a first cylinder and a second cylinder along the axial direction of the crankshaft.
A cylinder is provided, one end of the first cylinder is closed with a bearing, the other end is closed with a partition plate to form a first cylinder chamber, and one end of the second cylinder is closed with the partition plate,
The other end is closed with a bearing to form a second cylinder chamber, and a first rotor and a second rotor, which rotate within the first and second cylinder chambers, are connected to the first pin portion of the crankshaft and the second rotor. In a rolling piston type multi-cylinder rotary compressor in which the second pin portion is loosely fitted, the partition plate is divided into a first partition plate forming a first cylinder chamber and a second partition plate forming a second cylinder chamber. 2, and the first and second partition plates are respectively connected to the first and second partition plates.
The cylinders are attached to the pin part and the second pin part of the cylinder and are slidable in the space formed in the mating surfaces of the first cylinder and the second cylinder mutually and relative to each cylinder. It is characterized by being loosely fitted.

[Effect]

Since the present invention is configured as described above, each cylinder chamber is partitioned by attaching the first partition plate and the second partition plate to the first pin part and the second pin part of the crankshaft, respectively. be able to. Therefore, it is possible to assemble the crankshaft without dividing the crankshaft into two or dividing the partition plate into two in the diametrical direction.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

FIG. 2 is a cross-sectional view of essential parts of a multi-cylinder rotary compressor showing one embodiment of the present invention, in which members corresponding to those shown in FIG. 1 are given the same reference numerals.

The difference between the present invention and the conventional one is that the partition plate 9 that partitions each cylinder chamber is made of two layers, 9-a and 9-b, and these are attached to pin parts 10 and 11 provided on the crankshaft 2, respectively. By doing so, each cylinder chamber is partitioned.

However, the partition plates 9-a and 9-b have pin portions 10 and 1.
1, and it does not necessarily have to be fixed. Further, the outer diameter of the partition plates 9-a and 9-b is made large to the extent that changes in the contact area with the inner wall surface of the space 14 provided at the mating surfaces of the cylinders 3 and 4 due to rotational position do not affect gas leakage. It is loosely fitted into the space 14 to prevent gas leakage.

[Effect of idea]

As described above, in the present invention, the partition plate is composed of a first partition plate and a second partition plate, and these are stacked as two and each is attached to the first and second pin parts provided on the crankshaft. Since the cylinder chambers are partitioned by the cylinder chamber, assembly is much easier than when the crankshaft is divided into two parts or the partition plate is divided into two parts in the diameter direction, and the flatness of the partition plate is ensured, which improves processing accuracy and assembly. It has many advantages such as high accuracy and the ability to significantly reduce the amount of gas leakage.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional multi-cylinder rotary compressor, and FIG. 2 is a sectional view of essential parts of a multi-cylinder rotary compressor showing an embodiment of the present invention. 1... Housing, 2... Crankshaft, 3, 4
... Cylinder, 5, 6 ... Rotor, 7 ... Upper bearing, 8 ... Lower bearing, 9, 9-a, 9-b ... Partition plate, 10, 11 ... Pin part, 12 ... Motor,
13...Discharge pipe, 14...Space.

Claims (1)

[Scope of utility model registration request] A first cylinder and a second cylinder are provided along the axial direction of the crankshaft, one end of the first cylinder is closed with a bearing and the other end is closed with a partition plate to form a first cylinder chamber. A second cylinder chamber is formed by closing one end of the second cylinder with the partition plate and the other end with a bearing, and a first rotor and a second rotor that rotate within the first and second cylinder chambers. In the rolling piston type multi-cylinder rotary compressor which is loosely fitted to the first pin part and the second pin part of the crankshaft, the partition plate is a first partition plate forming a first cylinder chamber. , consisting of two partition plates, a second partition plate forming a second cylinder chamber, and the first and second partition plates are attached to the first pin part and the second pin part, respectively. In addition, the multi-layer cylinder is characterized in that two cylinders are loosely fitted in a space formed in the mating surfaces of the first cylinder and the second cylinder so as to be slidable relative to each other and each cylinder. Cylinder rotary compressor.