JPS62186094A - Rotary type compressor - Google Patents

Abstract

PURPOSE:To reduce the generation of noise of a compressor and to prevent lowering of compression efficiency due to strain of a bearing, by a method wherein a delivery cover, with which a groove is covered, is attached to a bearing in which a groove extending throughout a whole periphery is formed in a surface opposite to a cylinder in a range of from a surface, adhered to the flat surface of a cylinder, to a position forming an outer periphery. CONSTITUTION:A recessed part 13 for mounting a valve and a groove 14, situated throughout a whole periphery in a range of from a surface 12c adhered to the flat part of a cylinder 7 to a position, forming an outer periphery, are formed in a surface 12b opposite to a cylinder of a bearing 12, the whole periphery of which is securely welded to the inner peripheral surface of a closed case 2. A cup-shaped discharge cover 15 is situated on the surface 12b, opposite to a cylinder, of the bearing 12 in a manner to cover the groove 14 therewith. This constitution increases the volume of a discharge chamber 15b in the discharge cover 15 thanks to the presence of the groove 14, reduces the generation of noise due to pressure pulsation, absorbs strain and deformation occurring when the bearing 12 is securely welded to the closed case 2, and prevents lowering of compression efficiency due to leak of gas.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor used in refrigeration equipment and the like.

2. Description of the Related Art In recent years, compressors used in refrigeration equipment, etc. have been shifting from reciprocating types to rotary types from the viewpoint of energy and space saving. In these rotary compressors, the inside of the sealed case is usually the high pressure side, and the refrigerant compressed in the cylinder is once discharged into the space inside the sealed case before being discharged from the compressor to the cooling system. As a result, the pressure pulsation component of the refrigerant generated by the refrigerant being compressed in the cylinder is transmitted to the space inside the sealed case, causing air column resonance in the space inside the sealed case, which in turn causes the sealed case to vibrate, causing a large noise. occurs. Therefore, a configuration has conventionally been adopted in which a discharge chamber is provided immediately after the refrigerant is compressed in the cylinder to reduce the pressure pulsation component of the refrigerant.

An example of the conventional rotary compressor mentioned above will be described below with reference to the drawings.

4 to 6 show an example of a conventional rotary compressor.

In the figure, 1 is a rotary compressor, 2a is a body shell, 2b
is the front lid shell, 2c is the rear lid shell, and the body shell 2a
A front lid shell 2b1 and a rear lid shell 2C are welded to form a sealed case 2.

A stator 3 is fixed to the body shell 2a with a shrink fit.

A rotor 4 is connected to a crankshaft 6.

6 is a piston, and 7 is a cylinder.

Reference numeral 8 denotes a bearing on the rotor side, and the cylinder 7 is fixed to the side surface 8a of the cylinder.A linear recess 9 is provided on the opposite side of the cylinder 8b for storing and mounting the pulp 9a, and the recess 9 is connected to the cylinder 7. A communicating pulp hole 9b is also provided. Further, the bearing 8 is welded and fixed to the body shell 2a. Reference numeral 10 designates a cup-shaped discharge cover, which is provided with a discharge hole 10a and is press-fitted and fixed to the side of the bearing 8 opposite to the cylinder surface 8b, thereby forming a discharge chamber 10b. 11 is a bearing at the end of the shaft.

The operation of the rotary compressor configured as above will be described below.

The refrigerant compressed within the cylinder 7 is discharged from the pulp hole 9b into the discharge chamber 10b, and further from the discharge hole 10a.
The liquid is then released into the space inside the sealed case 2 formed by the body shell 2a, the front lid shell 2b, and the nine-part lid shell 2C.

Therefore, the pressure pulsation component of the refrigerant generated within the cylinder 7 is attenuated once the refrigerant is discharged into the discharge chamber 10b. Therefore, the pressure pulsation component of the refrigerant radiated into the sealed case 2 is attenuated, reducing the air column resonance within the sealed case 2, preventing the sealed case 2 from vibrating due to air column resonance, and compressing The machine can reduce the sound.

Problems to be Solved by the Invention However, in the above configuration, there is not enough space on the side opposite to the cylinder of the bearing 8 due to the presence of the stator 3 of the motor, and it is difficult to make the discharge chamber 10b too large. Can not.

Therefore, due to the insufficient volume of the discharge chamber 10b, the pressure pulsation component of the refrigerant cannot be sufficiently attenuated, resulting in insufficient reduction of compressor noise.

Furthermore, since the bearing 8 is directly fixed to the body shell 2a, thermal distortion caused by welding when fixing the bearing 8 to the body shell 2a and thermal strain caused when welding the front lid shell 2b to the body shell 2a may occur. This is because the collecting force is also applied to the part that fixes the bearing 8.

This causes distortion and deformation on the cylinder side surface 8a of the bearing 8.

Therefore, the bearing 8 and the piston 6 and the bearing 8 and the cylinder 7
A gap is created between the two, and the refrigerant leaks from the gap during compression, resulting in leakage loss and reducing the efficiency of the compressor.

In view of the above problems, the present invention significantly attenuates the pressure pulsation component of the refrigerant to reduce compressor noise without adding any new parts or impairing the compactness of the rotary compressor. This prevents the efficiency of the compressor from decreasing due to distortion and deformation.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention includes a bearing having one or more grooves over the entire circumference at a position on the outer circumference of the cylinder plane on the opposite cylinder surface; A discharge cover is provided on the opposite cylinder surface side of the bearing so as to cover the groove.

Effect of the Invention The present invention has the above-described configuration, which greatly attenuates pressure pulsation components by increasing the volume of the discharge chamber formed by the discharge cover and the bearing, thereby obtaining a great noise reduction effect. The strain and deformation of the bearing caused by welding is absorbed and prevented by the grooves provided in the bearing, thereby preventing a decrease in the efficiency of the compressor.

EXAMPLE Hereinafter, a rotary compressor according to an example of the present invention will be described with reference to the drawings. Incidentally, in order to avoid duplication of explanation, the same parts as in the conventional example are given the same reference numerals and the explanation will be omitted.

1 to 3 show an embodiment of a rotary compressor of the present invention. In the figure, 12 is a bearing on the rotor side,
The cylinder is fixed to the cylinder side surface 12a, and the anti-cylinder surface 12b has a linear recess 13 for storing and mounting the pulp 13a, and the surface 12 of the cylinder side surface 12a that is in close contact with the flat surface of the cylinder 7 (the outer periphery is A groove 14 is provided around the entire circumference at the position, and a pulp hole 13b communicating with the cylinder 7 is provided in the recess 13. [The bearing 12 is welded and fixed to the body shell 2a. A discharge hole 15a is provided in the discharge cover, and the discharge hole 15a is press-fitted into the bearing 12 so as to cover the groove 14, thereby forming a discharge chamber 15b.

The operation of the rotary compressor configured as described above will be described below with reference to FIGS. 1 to 3.

The refrigerant compressed within the cylinder 7 is discharged from the valve hole 13b into the discharge chamber 15b, and further discharged from the discharge hole 15a.
Torso shell 2a, front lid shell 2b, rear lid shell 2
It is released into the space inside the closed case 2 formed by C. Therefore, the pressure pulsation component of the refrigerant generated in the cylinder 7 is attenuated because the refrigerant is once discharged into the discharge chamber 1tsb, but at that time, the volume of the discharge chamber 1sb is reduced by the groove 14 provided in the bearing 12. Because it is large, the pressure pulsation component of the refrigerant can be sufficiently attenuated. Therefore, the pressure pulsation component of the refrigerant released into the internal space of the sealed case 2 becomes sufficiently small.
It is possible to prevent air column resonance in the internal space of the sealed case 2 and reduce compressor noise.Furthermore, the groove 14 of the bearing 12 prevents heat from being applied to the bearing 12 due to welding when fixing the bearing 12 to the body shell 2a. Distortion, trunk shell 2a and front lid shell 2b
Bearing 1 due to the shrinkage force of the thermal strain generated when welding
Strain and deformation to 2 are absorbed. Moreover, since the groove 14 is provided on the outer periphery of the flat part of the cylinder 7, the surface 12c of the bearing 12 that comes into close contact with the cylinder 7 is kept flat, and the bearing 1
There is no gap between the cylinder 2 and the cylinder 7, and a decrease in compressor efficiency due to leakage can be prevented.

Effects of the Invention As described above, the present invention provides a rotary compressor in which an electric compression element is directly fixed and housed in a sealed case, in which one or By providing a bearing having a plurality of grooves and a discharge cover disposed on the opposite cylinder surface side of the bearing so as to cover the grooves, a space sufficient to sufficiently attenuate the pressure pulsation component of the refrigerant is provided. This reduces compressor noise, and also prevents distortion and deformation of the part of the bearing in close contact with the cylinder caused by contraction forces such as thermal distortion that occur when fixing the bearing to a sealed case or welding the sealed case. The distortion of the plane of the bearing's contact area with the cylinder is prevented by absorbing it with a groove provided at a position on the outer periphery of the plane of the cylinder.

This prevents a decrease in compressor efficiency by preventing leakage loss caused by deformation.

[Brief explanation of drawings]

FIG. 1 shows a bearing for a rotary compressor showing an embodiment of the present invention.
FIG. 2 is a sectional view of the rotary compressor shown in FIG. 1, FIG. 3 is a sectional view of the rotary compressor showing an embodiment of the present invention, and FIG. 4 is an exploded perspective view showing the discharge cover. Figure 5 is an exploded perspective view showing the bearing and discharge cover of a conventional rotary compressor.
FIG. 6 is a sectional view of a conventional rotary compressor. 2... Sealed case, 7... Cylinder,
12...Both bearings, 14...Groove, 15.River...
discharge cover. Name of agent: Patent attorney Toshi Nakao, 1 person I2
-11 Sting Party Figure 3 Figure 4

Claims (1)

[Claims] a sealed case in which an electric compression element is directly fixed and housed; a bearing having one or more grooves along the entire circumference at a position on the outer circumference of the cylinder plane on the opposite side of the cylinder; A rotary compressor equipped with a discharge cover placed so as to cover the groove.