JP2644801B2 - Rotary compressor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor incorporating a check valve on the low pressure side of a cylinder.

2. Description of the Related Art In recent years, compressors used in home refrigerators and the like have been rapidly shifting to horizontal-type rotary machines because of their good storability.

Hereinafter, a conventional rotary compressor will be described with reference to the drawings. In FIG. 2, reference numeral 1 denotes a substantially cylindrical hermetic container which is long in the lateral direction and accommodates a motor M including a stator 2 and a rotor 3 and a compression device C driven by the motor M. Reference numeral 4 denotes oil, which accumulates below the closed container 1. Reference numeral 5 denotes a cylinder; Reference numeral 9 denotes a shaft connected to the rotor 3 and has an eccentric portion 10. Reference numeral 11 denotes a roller fitted to the eccentric portion 10 and inscribed in the compression chamber 8. Numeral 12 denotes a vane, which partitions the compression chamber 8 into high and low pressure sides by being pressed against the roller 11 by a spring (not shown). Reference numeral 13 denotes a suction pipe, one end of which is fitted in the auxiliary bearing 7, and the other end of which is outside the closed casing 1, and connected to a refrigeration system (not shown) via a check valve 19. The check valve 19 has a valve 21 operated by gravity and a valve seat portion 20, and is arranged such that the movable direction of the valve 21 matches the direction of gravity. Reference numeral 14 denotes a discharge pipe which is welded to the closed container 1.

V is a differential pressure valve disposed between an evaporator and a condenser (not shown) of the refrigeration system. 31 is a bellows, 32 is a nose that is fixed to and linked to the bellows 31, and 33 is a valve base facing the nose 32. 34 is a pressure guiding tube with one end bellows
In 31, the other end communicates between the check valve 19 and the suction tube 13.

In the above configuration, the rotation of the rotor 3 is transmitted to the shaft 9, and the roller 11 fitted in the eccentric portion 10 eccentrically rotates in the compression chamber 8, and the compression chamber 8 is pressed by the vane 12 pressed against the roller 6. The interior is divided into a high pressure side and a low pressure side,
The gas inhaled from 13 is continuously compressed. The compressed high-pressure gas is released into the closed vessel 1 and then discharged from the discharge side 14. At this time, the valve 21 is pushed up by the force of the gas, and the suction gas continuously flows into the compression chamber 8 via the suction pipe 13. In addition, the pressure guiding tube 34 becomes low pressure, and the bellows
The nose 32 is separated from the valve base 33 because 31 is shortened, and high-pressure gas flows from the condenser to the evaporator. Next, when the rotor 3 stops rotating, the compressed high-pressure gas in the airtight container 1 passes through the gap between the cylinder 5 and the main bearing 6 and the sub-bearing 7 or the gap between the vane 12 and the like, and moves toward the suction side. Backflow. When the backflowed high-pressure gas enters the refrigeration system, a problem of heating the evaporator occurs.However, in the check valve 19, the valve 21 is brought into close contact with the valve seat 20 by the backflowed high-pressure gas and its own weight,
The backflow of the high-pressure gas stops at the check valve 19.

The high-pressure gas that has flowed back passes through the pressure guiding tube 34,
The nose 32 is a valve base 33 because the bellows 31 is extended.
To shut off the space between the condenser and the evaporator. This prevents heating of the evaporator due to slow leak of high-pressure gas from the condenser to the evaporator.

However, since the valve 21 of the check valve 19 operates by its own weight, it is necessary to align the moving direction of the valve 21 with the direction of gravity, which has a drawback that the piping becomes complicated. ing. In addition, there is a problem that the number of welding locations increases due to the arrangement in the refrigeration system.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a rotary compressor that is inexpensive and enables simple piping and the like.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention forms a check valve between the compression chamber and the suction tube, and has one end of the check valve and the compression chamber at one end. The other end is provided with a pressure guiding passage communicating with a differential pressure valve provided outside the sealed container at the other end.

Action The present invention can operate the differential pressure valve as in the prior art, and the check valve can be installed in the rotary compressor, so that complicated piping and parts can be arranged in the system. It is possible to avoid an increase in welding locations.

Embodiment An embodiment of the present invention will be described below with reference to FIG.
The same parts as those in the conventional example will be described using the same reference numerals, and the same components and operations will be omitted.

In FIG. 1, reference numeral 25 denotes a plate-shaped lead, and 26 denotes a coil spring, which are slidably fitted into a lead guide portion 27 and a spring holding portion 28 formed in the cylinder 5, respectively. A valve B is formed. 29 is the compression chamber 8
And a pass hole communicating with the spring holding portion 28. Numeral 30 denotes an end face of the sub bearing 7, which is polished.

Reference numeral 40 denotes a conduction path formed in the main bearing 6, one end of which is open to the spring holding portion. Reference numeral 41 denotes a connection pipe, which is press-fitted and fixed to the main bearing 6 so that one end thereof communicates with the conduction path 40, is welded to the closed casing 1, and the other end is a differential pressure valve V
The bellows 31 communicates with the inside.

In such a configuration, the operation will be described first. When the rotary compressor is operating, the lead 25 is pressed against the coil spring 26 by the force of the suction gas against the spring force of the coil spring 26, and the suction gas passes through the pass hole 29 and enters the compression chamber 8. Flows into. Further, the pressure in the pressure guide path 40 becomes low, and the pressure in the bellows 31 becomes low through the connection pipe 41, so that the bellows 31
The nose 32 is away from the valve base 33 because of the reduced length, and the high pressure gas flows from the condenser to the evaporator.

Next, in the case where the rotary compressor is stopped, immediately after the stop, the flow of the suction gas is stopped, and the reed 25 is repelled to the auxiliary bearing 7 side by the force of the coil spring 26. At the same time, high-pressure gas passes through the
And the lead 25 is pressed by this high-pressure gas against the end face 30 of the secondary bearing 7 to seal it,
The backflow of high pressure gas stops at this point. Further, since the high-pressure gas flows into the bellows 31 from the spring holding portion 28 via the pressure guiding path 40 via the connection pipe 41, the bellows 31 extends, the nose 32 is pressed by the valve base 33, and the evaporator and the condenser Is shut off during

As described above, according to the present embodiment, the low-pressure check valve having a relatively good assemblability and a simple structure can be built in the rotary compressor, and the differential pressure can be operated as in the related art. Therefore, a simple system can be provided while having functions equivalent to those of the related art.

Effect of the Invention As described above, the present invention forms a check valve between the suction tube and the compression chamber, one end of which communicates between the check valve and the compression valve, and the other end of which is outside the closed container. By providing a pressure guide passage communicating with the provided differential pressure valve, it is possible to operate the differential pressure valve as before, and it is not necessary to provide a check valve in the refrigeration system, and complicated piping and welding points in the system are required. The increase can be avoided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a main part of a rotary compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional rotary compressor. 5 ... cylinder, 6 ... main bearing, 7 ... auxiliary bearing, 13 ... suction tube, B ... check valve, 40
…… pressure channel.

Claims (1)

(57) [Claims] 1. A motor comprising a stator and a rotor in a closed container, a shaft rotated by the motor, a cylinder forming a compression chamber, and a main bearing and a sub bearing which are in close contact with both surfaces of the cylinder. And a compression device including a suction tube that guides the suction gas to the compression chamber.A check valve is formed between the compression chamber and the suction tube of the cylinder, and one end of the check valve is connected to the check valve. A rotary compressor provided with a pressure guide passage communicating between the compression chambers and the other end communicating with a differential pressure valve provided outside the closed vessel.