JPH0588396B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary compressor used in refrigerators, air conditioners, etc.

BACKGROUND OF THE INVENTION In recent years, rotary compressors have become established in the industry. Conventionally, cylinders with relatively large cylinder volumes were used for air conditioners, but recently they have also been used for medium- and small-sized refrigerators, and applications with small cylinder volumes are also beginning to be applied.

An example of the prior art will be described below with reference to the drawings. A general rotary compressor will be explained based on FIG. 2. Reference numeral 1 denotes a hermetic shell, and an electric element 2 and a rotary compression element 3 are respectively disposed within this shell. The electric element 2 is composed of a stator 4 attached to the inner wall of the sealed shell 1 and a rotor 6 inserted through a crankshaft 5 provided within the stator. The rotary compression element 3 is the cylinder 7
The cylinder 7 is rotated by the eccentric shaft 8 of the crankshaft 5.
A roller 9 that rolls inside, a vane 10 that comes into contact with the roller and divides the inside of the cylinder 7 into a high pressure chamber and a low pressure chamber, a right side housing 11 that closes the opening of the cylinder 7, and a left side housing 12. It is made up of. The crankshaft 5 is pivotally supported within the right side housing 11, and the shaft end 5a of the crankshaft 5 is pivotally supported within the left side housing 12. In other words, it has a double-sided bearing configuration.

The operation will be explained below.

When the electric element 2 is energized, the crankshaft 5 integrated with the rotor 6 rotates, the roller 9 rolls along the inner wall of the cylinder 7, the gas in the compression chamber is compressed, and the closed shell 1 The inside of the sealed shell is filled with high pressure gas. Then, it is discharged to the outside via a discharge pipe (not shown). On the other hand, low-pressure gas is led directly into the compression chamber from outside the closed shell.

Problems to be Solved by the Invention As mentioned above, rotary compressors are beginning to be widely used, from those with large cylinder volumes to those with small cylinder volumes.

For cylinders with large volumes, a large load is applied to the bearings, so a conventional dual-support configuration is required. However, for cylinders with small volumes, the load applied to the bearings is also small, so the conventional dual-support configuration is not necessary and the specifications are wasteful.

In view of the above problems, the present invention provides an inexpensive rotary compressor with simplified parts.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention has a structure in which both ends of the cylinder are brought into airtight contact.
One side of the side housing is constructed from a stamped steel plate such as tempered spring steel.

Effects The present invention has the above-mentioned configuration, by changing the conventional double-supported bearing to a cantilever bearing and using a stamped steel plate material such as tempered spring steel for the side housing on the side that is not supported. Parts can be simplified.

Embodiment A rotary compressor according to an embodiment of the present invention will be described below with reference to the drawings. The same parts as in FIG. 2 of the prior art described above are indicated by the same numbers, and detailed explanation thereof will be omitted.

Reference numeral 55 denotes a crankshaft, and its straight portion 55a is supported by the right side housing 11 in a cantilevered manner. Reference numeral 56 designates a side housing plate on the left side in the figure, which is a flat plate and is made of a stamped steel plate such as tempered spring steel called flapper valve steel with a thickness of about 0.2 to 0.5 mm.
57 is a discharge valve that discharges refrigerant from the compression chamber 58.

59 is a muffler cover that covers the discharge valve 57.

Next, the operation of the rotary compressor configured as above will be explained.

When the electric element 2 is energized, the gas in the compression chamber 58 is compressed as described above, guided from the discharge valve 57 into the muffler cover 59, muffled, and then guided into the space of the sealed shell 1. The inside is filled with high pressure gas. The filled gas pushes the wall surface of the side housing plate 56 and tries to bend it inward into the cylinder. On the other hand, gas compression force also acts inside the cylinder. Therefore, the side housing plate 56 changes slightly in response to the pressure difference between the two, and the clearance between the roller 9 and the vane 10 and the side housing is maintained appropriately. The rotary compressor has the same volumetric efficiency as the side housing of a bearing bearing in which conventional high-precision machining and clearance selection combinations are implemented by the side housing plate 56 of the present invention constituted by a single plate. Become.

Effects of the Invention As described above, the present invention allows one side of the side housing, which is airtightly attached to both ends of the cylinder, to be made of a stamped steel plate material such as tempered spring steel. It has the same volumetric efficiency as a conventional rotary compressor in which a selected combination of clearances has been implemented. In other words, the side housing plate of the present invention can be produced by simply punching a steel plate, eliminating the need for conventional high-precision machining and selection and combination of clearances in the cylinder height direction, greatly simplifying parts and reducing materials and man-hours. Since it saves money, it is cheaper.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotary compressor showing an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional rotary compressor. 7... Cylinder, 8... Eccentric shaft, 9... Roller, 11... Right side housing, 55... Crankshaft, 56... Side housing.

Claims (1)

[Claims] 1. An eccentric shaft, a cylinder that forms a compression chamber concentrically with the center of rotation of the eccentric shaft, a roller that is attached to the eccentric shaft and rolls along the inner wall of the cylinder as the eccentric shaft rotates, and A side housing that contacts the outer periphery of the roller and partitions the compression chamber into a high-pressure chamber and a low-pressure chamber, and that seals both ends of the cylinder in an airtight manner.The side that does not support the eccentric shaft is a tempered punching. A rotary compressor made of steel plate material.