JPS6329091A - Rotary compressor - Google Patents

Abstract

PURPOSE:To make it possible to house a check valve in a rotary compressor by holding the reed of the check valve in the inlet port of a cylinder with a clamping ring for a filter pressed into said inlet port, and a coil spring with the filter. CONSTITUTION:When a rotary compressor is in operation, a reed 25 serving as a check valve is subjected to intake gas pressure from a suction tube 13 to open an inlet port 30 against a coil spring 26, and intake gas passes through a filter 27 which is pressed in the inlet port 30 and fixed with a clamping ring 28, and then flows into a compression space 8. The flat plate shaped reed 25 forming the check valve is held in the inlet port 30 with the clamping ring 28, and the coil spring 26 is held with the filter 27. The check valve can be therefore integrated compactly in a rotary compressor to prevent an increase in welding spots for the installation of complicated piping or parts in a system.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor having a built-in check valve on the low pressure side of the cylinder.

BACKGROUND OF THE INVENTION In recent years, compressors used in household refrigerators and the like are rapidly shifting to horizontal rotary compressors because of their ease of storage.

A conventional rotary compressor will be described below with reference to the drawings. In FIG. 2, reference numeral 1 denotes a substantially cylindrical closed container long in the transverse direction, a motor M consisting of a stator 2 and a rotor 3, and a compression device C driven by this motor M.
is stored.

4 is oil, which is collected below the closed container 1.

6 is the cylinder, and 6.7 is the bearing.

The secondary bearings are closely attached to both sides of the cylinder 5 and form a compression chamber 8. A shaft 9 is connected to the navigation rotor 3 and has an eccentric portion 10 . A roller 11 is fitted into the eccentric portion 10 and is inscribed in the compression chamber 8. A vane 12 is pressed against the roller 11 by a spring (not shown) to partition the compression chamber 8 into high and low pressure sides. Reference numeral 13 denotes a suction pipe, one end of which is fitted into the sub-bearing 7, the other end protruding from the closed container 1, and connected to a refrigeration system (not shown) via a check valve 19. The reverse valve 19 includes a valve 21 that is operated by gravity and a valve seat portion 20, and is arranged so that the movable direction of the valve 21 coincides with the direction of gravity. 14 is a discharge pipe which is welded to the closed container 1.

In the above configuration, the rotation of the rotor 3 is transmitted to the shaft 9, the roller 11 fitted in the eccentric part 1o rotates eccentrically in the compression chamber 8, and the vane 12 pressed against the roller 6 causes the compression chamber 8 to The inside is the high pressure side.

By being partitioned into the low pressure side, the gas sucked through the suction pipe 13 is continuously compressed. The compressed high-pressure gas is once released into the closed container 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 continues to flow into the compression chamber 8 via the suction pipe 13. Next, when the rotor 3 stops rotating, the compressed high pressure gas in the sealed container 1 is transferred to the cylinder 6 and the main bearing 6.
It passes through the gap with the sub-bearing 7 or the gap with the bay 712, and flows back to the suction side. If this backflowing high-pressure gas enters the refrigeration system, a problem arises in that it heats up the evaporator.However, in the backflow valve 19, the valve 21 is pressed into close contact with the valve seat 20 by the backflowing high-pressure gas and its own weight, and the high-pressure gas Backflow stops at check valve 19.

Problems to be Solved by the Invention As mentioned above, the check valve 19 is one of the components installed in a refrigeration system using a rotary compressor for the purpose of preventing backflow of high-pressure gas. Furthermore, since the valve 21 operates by its own weight, it is necessary to align the direction of movement of the valve 21 with the direction of gravity, which has the disadvantage of complicating the piping. Also,
The valve 21 and the valve seat 20 are necessary to prevent leakage.
Extremely high precision is required, which inevitably results in an expensive component. Further, since the device is installed in a refrigeration system, there are problems such as an increase in the number of welding points.

In view of the above-mentioned problems, the present invention provides a rotary compressor that is inexpensive and allows simple piping.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention includes a reed, a coil spring, and a filter in the suction hole of the cylinder between the suction tube and the compression chamber. the filter is press-fitted into the suction hole of the cylinder, the reed is held in the suction hole of the cylinder by a stopper of the filter, and the coil spring is held by the filter. It has a set configuration.

Effects According to the present invention, the check valve can be built into the rotary compressor in a compact manner due to the above-mentioned configuration.

EXAMPLE An example of the present invention will be described below with reference to FIG. The same parts as those in the conventional example will be explained using the same symbols, and the configuration,
Descriptions of the same operations will be omitted.

In Fig. 1, 25 is a flat reed, 26 is a coil spring, and 27 is a filter, which is used to remove dust from the intake gas.It also serves to hold the coil spring. Press-fitted into the suction hole wall.

Furthermore, this fixture 28 also serves as a stop for the lead 25. 30 is a suction hole provided in the cylinder;
The lead 25 is provided at the entrance of this suction hole 3Q,
It is provided so that it can be closed at all times by the coil spring 26. 31 is the end face of the secondary bearing 7, which is polished and finished.

In this configuration, the operation will be explained first. When the rotary compressor is operating, the reed 25 opens the entrance of the suction hole 30 by the force of the suction gas against the spring force of the coil spring 26, so that the suction gas flows through the suction hole 3o and the filter 2.
7 and flows into the compression chamber 8. Next, when the rotary compressor stops, the flow of intake gas stops immediately after the rotary compressor stops, and the reed 26 is pressed toward the sub-bearing 7 by the force of the coil spring 26. At the same time, high-pressure gas flows back from inside the compression chamber 8, and the lead 25 is pressed against the end face 31 of the sub-bearing 7 by this high-pressure gas to form a seal, so that the backflow of high-pressure gas stops at this portion.

According to the above embodiment, since the check valve is provided within 3 degrees of the suction hole of the cylinder 6, there is no need to install it in an external system by welding, and it can be built compactly.

Effects of the Invention As described above, the present invention forms a check valve having a reed, a coil spring, and a filter in the suction hole of the cylinder between the suction tube and the compression chamber, and the filter is configured to form a check valve having a reed, a coil spring, and a filter. The reed is press-fitted into the hole and held in the suction hole of the cylinder by the stopper of the filter, and the coil spring is held by the filter, making it possible to compactly install the reverse valve inside the rotary compressor. This eliminates the need for complex piping and parts to be installed in the system, thereby avoiding an increase in the number of welding points required.

[Brief explanation of the drawing]

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 rotor IJ-compressor. 1... Airtight container, 2... Stator, 3...
...Rotor, 6...Cylinder, 6...
...Main bearing, 7...Subbearing, 9
...shaft, 13 ... suction tube, 26 ... lead, 26 ... coil spring, 27 ... filter, 28 ...
...Stopper, 30...Suction hole. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
-Ichichu Fuyuumaki--Lead 30-m-Suction hole

Claims (1)

[Claims] A motor consisting of a stator and a rotor is placed in a sealed container,
A compression device including a shaft rotated by the motor, a cylinder forming a compression chamber, a main bearing and a sub-bearing closely attached to both sides of the cylinder, and a suction tube that guides intake gas to the compression chamber, A check valve having, in a suction hole provided in the cylinder between a suction tube and a compression chamber, a reed for opening and closing the suction hole, and a coil spring and a filter for always pressing the reed so as to close it. form,
and the filter is press-fitted into the suction hole of the cylinder, the lead is held in the suction hole of the cylinder by a stopper of the filter, and the coil spring is held by the filter. A rotary compressor featuring: