JPS62291490A - Rotary compressor - Google Patents

Abstract

PURPOSE:To improve the seal performance of a rotary compressor by providing substantially coaxial two grooves on the open end surface of a cylinder before a grind work is done, thereby utilizing the part between the grooves. CONSTITUTION:Substantially coaxial grooves 3 are formed on the open end surface of a cylinder 1, and a grinding work is applied thereafter, thereby the form of the part between the grooves 3 are resiliently changed. As the part protrudes from the flat surface therearound, if a bearing end board 2 is mounted on the cylinder 1 by means of a bolt 4, this protruding part bites the board 2 as it is deformed. It is thus possible to surely seal the lead from a high pressure part to a suction chamber in a closed vessel by using said protruding part.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates primarily to a rotary compressor used in a refrigeration system.

2. Description of the Related Art Conventionally, a so-called rolling piston type rotary compressor has a structure shown in FIG.

That is, the compression element 12 is stored inside the airtight container 11,
The inside of the closed container 11 is a high pressure space.

Ff, the contraction element 12 has a crankshaft 13 that rotates eccentrically;
The piston 14 to be inserted, the cylinder 15 in which the piston 14 rotates eccentrically, and the space created by the piston 14 and the cylinder 15 that presses against the piston 14 are sucked into a compression chamber 16 (not shown). Chamber 17 (not shown)
A vane 18 (not shown) that partitions the cylinder 15 and two bearing end plates 19 that support the crankshaft 13 and close the open end of the cylinder 15 are attached to the cylinder 15 with bolts 20 to modify the groove.

(For example, Japanese Utility Model Application Publication No. 58-2391.) However, in such a configuration, in order to close the open end face of the cylinder 6, the plane of this cylinder end face and the plane of the bearing end plate 10 are Since the sealing performance is performed on the mating surfaces of these planes, the sealing performance is affected by the surface accuracy (flatness and surface thickness) of these planes. If the sealing performance is poor, - the refrigerant will flow from the high pressure part of the sealed container 1 to the suction chamber 8. Gas and lubricating oil leak, resulting in a decrease in volumetric efficiency.For this reason, in order to improve this sealing performance, conventional technology has considered improving the surface accuracy of the side planes and using rubber-based elastic materials such as ○ rings. However, all of them had problems such as increased cost and decreased reliability.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention provides two substantially concentric grooves on the open end surface of the cylinder before the grinding process. The sealing performance is improved by utilizing the fact that the part between the grooves is distorted by the processing pressure during the grinding process of the open end face, so it is difficult to grind and protrudes from the surrounding open end face.

For production The effect of this technical means is as follows.

In other words, after grinding two substantially concentric grooves on the open end surface of the cylinder, the area between the two grooves is strained by the surrounding end parts due to the machining force of the grinding wheel. Because of this, the portion between these two grooves has a protrusion of several microns to several microns from the surrounding open end surface. When a bearing end plate is tightened and attached to the open end face of such a cylinder with bolts, the 6TR concentric protrusion will always come into contact with the bearing end plate, ensuring that leakage from the high pressure part of the sealed container is prevented. Seal.

Example An embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an enlarged vertical cross-sectional view of the main parts of the compression element of the rotary compressor of the present invention, in which 1 is a cylinder, 2 is a bearing end plate, 3 is a groove, and 4 bolts. FIG. 2 is a view along the line I-I' in FIG. 1, where 1 is a cylinder, 3 is a groove, 5 is a piston, 6 is a vane, 7 is a compression chamber, and 8 is a suction chamber. FIG. 3 shows the state during grinding of the open end surface of the cylinder, where 1 is the cylinder, 3 is a groove, and 9 is a grinding wheel.

First, as shown in Fig. 2, a cylinder 1 having two substantially concentric grooves 3 on its open end face is ground as shown in Fig. 3.
Since the portion between the grooves 3 undergoes elastic deformation, the amount of machining allowance due to grinding is smaller than that of the surrounding flat portion. Therefore, this portion is more convex than the surrounding planar portion. In this way, a substantially concentric protruding portion is formed on the open end surface of the cylinder 1, so when the bearing end plate 2 is attached to the cylinder 1 with the bolts 4 as shown in FIG. End plate 2
It will become wedged in while deforming.

Therefore, leakage from the high pressure part of the closed container to the suction chamber 8 is reliably sealed at this part.

In this embodiment, the grooves and grooves are provided on the cylinder, but the same effect can be achieved by providing the grooves on the bearing end plate.

Effects of the Invention In the present invention, a groove substantially concentric with the sliding shaft is provided on the open end surface of the cylinder before the grinding process, so that the sealing performance between the cylinder open end surface and the bearing end plate is improved, and the high pressure part of the closed container is Leakage of refrigerant and lubricating oil into the suction chamber of the compression element is reduced, the volumetric efficiency of the compression element is improved, and the performance of the rotary compressor can be improved.

Moreover, according to the present invention, the UkJ accuracy of the cylinder open end face and bearing end face can be lowered, resulting in cost reduction, and since materials with low refrigerant resistance, such as rubber sole, are not used. , reliability will not deteriorate.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of a main part of a compression element of a rotary compressor according to an embodiment of the present invention, FIG. 2 is a view taken along arrow I-I' in FIG. FIG. 4 is a cross-sectional view of a main part showing the machining of the cylinder open end surface of the embodiment, and FIG. 4 is a vertical cross-sectional view of a conventional rotary compressor. 1...Cylinder, 2...Bearing end plate, 3
...Groove, 4...Bolt, 5...
・Piston, 6...vane. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
m-shilling figure 1? -Glaze plate extension 3---Punoro part 4-11 Bolt J J 5=-Piston 9-11 Fujishi

Claims (1)

[Claims] a crank part that rotates eccentrically as the drive shaft rotates; a cylindrical piston fitted into the crank part; a cylindrical cylinder in which the piston rotates eccentrically; and a vane that divides the space created by the cylinder into a suction chamber and a compression chamber, and a bearing end plate that supports the drive shaft and closes the open end surface of the cylinder, and the open end surface of the cylinder is ground. A rotary compressor in which two grooves substantially concentric with the drive shaft are provided in the front.