JP2574368B2 - Rotary compressor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor used for a refrigerator or the like.

2. Description of the Related Art In recent years, rotary compressors have become mainstream rather than reciprocating compressors from the viewpoint of energy saving and space saving for compressors used in refrigerators and the like. In these rotary compressors, the electric compression element is usually fixed and housed directly in a closed case.
Therefore, the vibration generated by the electric compression element is transmitted to the sealed case without being absorbed by the spring or the like, so that the sealed case is vibrated, and the pipe or the like fixed to the sealed case is vibrated, thereby reducing noise from the pipe. There was a problem such as occurrence of a break or broken pipe.

Hereinafter, an example of the above-described conventional rotary compressor will be described with reference to the drawings.

FIG. 6 shows an example of a conventional rotary compressor.

In the figure, 1 is a rotary compressor and 2 is a closed case. Reference numeral 3 denotes a stator of the motor, which is fixed to the sealed case 2 by shrink fitting. Reference numeral 4 denotes a motor rotor, which is connected and fixed to the crankshaft 5 by shrink fitting. Reference numeral 6 denotes a piston, which is rotatably fixed to an eccentric portion of the crankshaft 5. 7 is a cylinder. 8 is a bearing on the rotor side,
The shrink fit is fixed to the closed case 2. Reference numeral 9 denotes a shaft end bearing, and reference numeral 10 denotes a cup-shaped discharge cover, which is press-fitted and fixed to the bearing 9. Reference numeral 11 denotes a center pin, which is welded and fixed to the closed case 2 at a position substantially the same as the axis of the crankshaft 5, and further, a front mount 12 is inserted via a vibration-proof rubber 13. Reference numeral 14 denotes a rear mount, which is fixed to the closed case 2 by welding. A mount gum 15 is fixed to the front mount 12 and the rear mount 14, and elastically supports and fixes the rotary compressor 1. A discharge pipe 16 is welded to the closed case 2. Reference numeral 17 denotes a suction pipe, the end of which is press-fitted and fixed to the bearing 9 and a part of which is fixed by welding to the closed case 2.

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

When the refrigerant is compressed in the cylinder 7, a large change in pressure during one rotation in the cylinder 7 causes a change in angular velocity in the rotation of the crankshaft 5, and as a reaction, a force is applied to the cylinder 7 and the like. receive. As a result, vibration in the torsional direction about the axis of the crankshaft 5 occurs. As a result, the closed case 2 vibrates, and the closed case and the closed case 2 vibrate, so that the vibration is transmitted to the system piping from the discharge pipe 16 and the suction pipe 17 fixed to the closed case 2. Then, problems such as generation of noise from the pipe and breakage of the pipe occur. For this purpose, the front portion of the compressor is fixedly supported by a center pin 11 provided at a position that is the center of the vibration in the torsional direction, and the rotary compressor 1 is free from the torsional vibration. Although there is pure vibration in the torsional direction of the compressor 1, vibrations having relatively large displacement such as oscillating vibrations can be suppressed small, and problems such as noise caused by large vibrations of pipes and broken pipes can be solved. .

Problems to be Solved by the Invention However, since the compressor is in a free state with respect to the torsional vibration, which is the center vibration of the compressor, the displacement amount is small, but the vibration is caused. However, there is a problem that the problem of broken pipes is not sufficiently solved by a rotary compressor having a large cylinder capacity.

The present invention has been made in view of the above problems, and provides a rotary compressor that reduces noise from piping and eliminates broken piping.

Means for Solving the Problems To solve the above problems, the rotary compressor of the present invention is:
A stator having a plurality of rolling elements disposed on an outer peripheral portion, a bearing or a cylinder having a plurality of rolling elements disposed on an outer peripheral portion, and a sealed case for fixing the stator and the bearing or the cylinder via the rolling elements. Things.

The present invention can reduce the torsional vibration, which is the central vibration of the rotary compressor, by minimizing the transmission of the torsional vibration generated for compressing the refrigerant to the sealed case by the configuration described above. .

Embodiment Hereinafter, a rotary compressor according to an embodiment of the present invention will be described with reference to the drawings. In order to avoid repetition of the description, the same parts as those of the conventional example are denoted by the same reference numerals, and the description will be omitted.

1 to 5 show an embodiment of the rotary compressor according to the present invention. In the figure, reference numeral 18 denotes a stator of the motor, a recess 18a for accommodating a plurality of balls 19 on an outer peripheral portion,
In the recess 18a, it is movable only in the inner circumferential direction of the ball 19,
A groove 18b is provided so as not to move in the axial direction. Two
Numeral 0 denotes a ring-shaped outer shell, which holds the ball 19 so as to be movable only in the circumferential direction by the concave portion 20a, and fixes the outer periphery of the ball 19 to the sealed case 2 by shrink fitting to fix the stator 18 to the sealed case 2. The support is fixed. Reference numeral 21 denotes a rotor-side bearing, which fixes the stator 18 to a cylindrical rib 21a extending toward the stator 18 and moves a plurality of balls 22 only in a circumferential direction on a circular outer peripheral portion. A groove 21b is provided so as not to move in the direction. Reference numeral 23 denotes a ring-shaped retainer, which is arranged near the groove 21b of the bearing 21, and prevents the balls 22 from contacting each other by inserting the balls 22 into the holes 23a. 24 is a ring-shaped outer shell, recessed
The bearing 21 is supported and fixed to the sealed case 2 by holding the ball 22 so as to be movable only in the circumferential direction by 24a, and fixing the outer periphery of the ball 22 to the sealed case 2 by shrink fitting. twenty five
Is a suction pipe, the end of which is press-fitted and fixed to the bearing 9, a part of which is fixedly welded to the sealed case 2, and a bellows-like vibration absorbing portion 25 a is provided between the press-fitted portion and the welded portion.

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

When the refrigerant is compressed in the cylinder 7, the pressure fluctuates greatly during one rotation in the cylinder 7, causing a change in the angular velocity of the rotation of the crankshaft 5. A force is generated, and the motor also generates a torsional force on the stator 18 as a reaction force due to torque fluctuation due to angular velocity fluctuation. that time,
Balls 22 and 19 are provided on the outer periphery of the bearing 21 and the stator 18.
The bearing 21 and the stator 18 are free from vibration in the torsional direction with respect to the sealed case 2, and the torsional vibration is not transmitted to the sealed case 2. Further, the vibration transmitted from the bearing 9 through the suction pipe 25 is absorbed by the vibration absorbing portion 25 a provided in the suction pipe 25, and the vibration is not transmitted to the closed case 2. In addition, simply arranging the balls 22 and 19 on the outer periphery of the bearing 21 and the stator 18 causes the bearing 21 and the stator to be distorted by the load torque generated when the refrigerant is compressed.
The stator 18 itself may rotate, but since the stator 18 is fixed to the bearing 21, the stator 18 moves integrally with the bearing 21 and is supported by the closed casing 2 by the suction pipe 25. Therefore, the rotation of the bearing 21 and the stator 18 can be suppressed without providing a special rotation prevention mechanism. or,
Since a large load torque giving the rotation motion is not always applied during one rotation of the crankshaft 5, the vibration absorbing portion 25a absorbs the rotation operation generated at the time of the large load torque, and the rotation of the bearing 21 and the stator 18 is reduced. It is possible to prevent the vibration in the torsion direction from being transmitted to the sealed case 2 while preventing the vibration, and it is possible to reduce almost no problems such as generation of noise due to vibration of the pipe fixed by welding to the sealed case 2 and breakage of the pipe. . Further, since the vibration of the sealed case 2 is greatly reduced, the vibration transmitted to the base (not shown) on which the compressor 1 is installed via the mount rubber 15 can be prevented, and the sound of the base generated by the vibration can be prevented. The occurrence of abnormal noise such as noise can also be prevented. More balls
Reference numerals 19 and 22 denote a groove 18b in the recess 18a of the stator 18 and the outer shell 20.
The stator 18 and the bearing 21 are prevented from moving in the axial direction because the concave portion 20a and the groove 21b of the bearing 21 and the concave portion 24a of the outer shell 24 move only in the circumferential direction, and the movement in the axial direction is suppressed. However, it is also possible to prevent an increase in motor loss caused by moving in the axial direction. In addition, the ball 19 is a recess of the stator 18
Since the ball 22 is inserted into the hole 23a of the holder 23 in the hole 18a, the problem that the balls 19 and the balls 22 come into contact with each other and generate abnormal noise can be solved.

Effect of the Invention As described above, the present invention provides a rotary compressor in which an electric compression element is fixedly housed in a sealed case, a plurality of rolling elements are arranged on an outer peripheral portion, and the sealing case is provided through the rolling elements. By providing a fixed stator and a plurality of rolling elements on an outer peripheral portion thereof and a bearing or a cylinder fixed to the sealed case via the rolling elements, a refrigerant that is the central vibration of the rotary compressor The torsional vibration of the electric compression element generated during compression is prevented from being transmitted to the sealed case by making the stator and the bearing or the cylinder free from the sealed case by the rolling elements provided on the outer periphery to prevent the vibration. Problems such as generation of noise and pipe breakage caused by vibration of the pipe fixed to the case can be reduced to almost none. Furthermore, even when the compressor is installed, since the vibration of the sealed case is greatly reduced, it is possible to prevent the occurrence of abnormal noise such as a noise generated by the vibration of the compressor of the installed base.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a stator of a rotary compressor showing one embodiment of the present invention, FIG. 2 is a longitudinal sectional view near a bearing of the compressor, and FIG. 3 is a longitudinal section of a bearing of the compressor. FIG. 4 is an exploded perspective view of a retainer of the compressor, FIG. 5 is a transverse sectional view of the compressor, and FIG. 6 is a transverse sectional view of a conventional rotary compressor. 2… Closed case, 18… Stator, 19… Ball, 21
… Bearing, 22… Ball, 25… Suction tube, 25a …… Vibration absorber.

Claims (1)

(57) [Claims] 1. A stator having a plurality of rolling elements disposed on an outer peripheral portion, a bearing or a cylinder having a plurality of rolling elements disposed on an outer peripheral portion, and fixing the stator and the bearing or the cylinder via the rolling elements. A rotary compressor having a sealed case.