JPS6073085A - Rotary compressor - Google Patents

Abstract

PURPOSE:To make it possible to carry out the stepless control of capacity of a rotary compressor in accordance with the load thereof, by disposing an electrically operated valve member in a communication port provided in an upper or lower bearing in the sliding section of a vane and communicating between high and low pressure chambers, and by time-controlling the reciprocation of this valve member. CONSTITUTION:A communication port 22 communicating between a low pressure chamber 14 and a high pressure chamber 13 through a vane 10 is formed in an upper bearing 6 in the sliding position of the vane 10, and a valve member 23 which is actuated when an electromagnet 25 is energized. When the electromagnet 25 is eneregized, the valve member 23 is attracted to the electromagnet 25 overcoming the spring force of a valve member retaining spring 26 so that the comminication port 22 is opened to communicate between the low pressure chamber 14 and the high pressure chamber 13. Accordingly, no compressing operation is effected during energization of the electromagnet 25. With this arrangement the capacity of the compressor may be steplessly controlled in accordance with the load of the compressor only by time-controlling the opening frequency of the valve member 25.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary compressor used in a refrigeration device such as a room cooler.

Conventional Structure and Problems Conventionally, there has been a rotary compressor having a variable capacity function as shown in FIG.

In FIG. 1, 1 is a closed container, and this closed container 1
An electric element 3 and a compression element 4 connected by a rotating shaft 2 are housed inside. Reference numeral 5 denotes a cylinder, and an upper bearing 6 and a lower bearing 7 are firmly attached to both ends of the cylinder. A roller 8 is slidably provided on the outermost part of the eccentric portion 2a of the rotating shaft 2, a narrow groove 9 is provided in the cylinder 5, and a vane is slidably provided in the narrow groove 9. 10 are stored. 11 is cylinder 5. Upper and lower bearings6. a.

This is a compression chamber defined by the roller 8 and partitioned into a high pressure chamber 13 and a low pressure chamber 14 by a bay 710 pressed against the roller 8 by a spring 12. Suction holes 15 are located in the low pressure chamber 14 on both sides of the base 710. Hyperbaric chamber 13
A discharge hole 16 is provided inside each of them.

17 is a release hole bored in the inner wall of 7 cylinder 6;
It communicates with the suction hole 16 via a solenoid valve 18.

In addition, 19 is a discharge valve, 20 is a valve holder, and 21 is a discharge valve.

Next, we will discuss the effect.

In the case of full-load operation, the solenoid valve 18 is closed, and the refrigerant gas equivalent to the volume of the compression chamber 11 that has flowed in from the suction hole 15 is compressed by the rotational movement of the roller 8, and once inside the closed container 1 through the discharge hole 16. After being opened to the air, the air flows through the discharge pipe 21 to the condenser A, the pressure reducer B, and the evaporator C7 suction hole 15 in this order, forming a refrigeration cycle.

Next, when the load is lowered to reduce the capacity of the compressor and the compressor is operated, the solenoid valve 18 is closed, and a part of the refrigerant gas sucked into the compression chamber 11 passes through the release hole 17 and is bypassed to the suction hole 15. and low capacity operation is performed.

However, in such a configuration, the capacity variable function is a stepwise control, and it is not possible to obtain the capacity according to the load.

Furthermore, an inverter method is known as a stepless control method, but this method requires an inverter and is expensive.

OBJECTS OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide an inexpensive rotary compressor that can be controlled steplessly according to the load.

Structure of the Invention In order to achieve the above object, the present invention provides a communication port through which a low pressure chamber and a high pressure chamber communicate with each other at the vane sliding position of the upper or lower bearing, and an electrically or mechanically actuated device is provided in the communication port. A valve body is provided to enable stepless control depending on the load.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 to 6. Incidentally, to avoid duplication, the same parts as in the prior art are given the same numbers and their explanations will be omitted.

On the sliding axis of the vane 10 of the upper bearing 6, there is a vane 710.
A communication port 22 having a diameter larger than the width of the vane is opened to the vane sliding surface and is provided so that the low pressure chamber 14 and the high pressure chamber 13 communicate with each other through the vane 10. A valve body 23 is slidably housed within this communication port 22. The valve body 23 can be attracted by an electromagnet 25 fixed to the upper bearing 6 which is energized through a lead wire 24.
5, when the valve body is not energized, the valve body presser spring 26 presses the valve body so that it is flush with the inner surface of the cylinder.

Next, we will discuss the effect.

When performing full load operation, the electromagnet 25 is demagnetized. Then, the valve body 23 is moved downward by the spring force of the valve body pressing spring 26 and comes into contact with the end surface (inner surface) of the cylinder 5, resulting in the state shown in FIG. Therefore, since the communication port 22 is closed between the low pressure chamber 14 and the high pressure chamber 13, there is no gas communication, and the normal operation of a rotary compressor is performed.

Next, a case will be described in which the compressor is operated with reduced capacity.

When the electromagnet 25 is energized, the valve body 23 is moved by the valve body pressing spring 26.
It overcomes the spring force and is attracted as shown in FIG. 6, and the communication port 22 becomes open, and the low pressure chamber 14 and the high pressure chamber 13 communicate with each other. Therefore, no compression operation is performed while the electromagnet 26 is energized.

Therefore, in order to obtain the capacity according to the load, compression is necessary.

It is sufficient to repeat the uncompressed state, that is, to control the time during which the electromagnet 25 is energized.Increasing the opening frequency within a unit time reduces the capacity, and conversely, decreasing the frequency increases the capacity.

Effects of the Invention As described above, the present invention provides a communication port through which the low pressure chamber and the high pressure chamber communicate through the vane at the vane sliding position of the upper or lower bearing, and electrically or mechanically connects the low pressure chamber and the high pressure chamber through the vane. Since we have provided a valve body that operates, by simply controlling the reciprocating motion of this valve body over time, we can obtain a rotary compressor that allows stepless control of the capacity according to the load. Since the opening allows a bypass between the high and low pressure chambers, the configuration is simple and sealing surface accuracy is easy to obtain.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional rotary compressor, Fig. 2 is a sectional view taken along line n-n' in Fig. 1, and Fig.
The figure is a sectional view of a rotary compressor showing an embodiment of the present invention, FIG. 4 is a sectional view taken along the line ■-IV' in FIG. state and uncompressed state. 2...Rotating shaft, 5...Cylinder, 6...
...Upper bearing, 7...Lower bearing, 8...
...Roller, 10...Vane, 11...
...Compression chamber, 13...High pressure chamber, 14...
・Low pressure room, 22... Communication port, 23...
Valve body. Name of agent: Patent attorney Toshio Nakao and one other person (Figure 1, Figure 2, Figure 3)

Claims (1)

[Claims] A compression chamber defined by a roller that rotates together with a cylinder, two rotation shafts of upper and lower bearings, and a vane that reciprocates while abutting the roller and partitions the compression chamber into a low pressure chamber and a high pressure chamber; A rotary compressor, wherein a single communication port through which the low pressure chamber and the high pressure chamber communicate with each other is provided in the sliding portion of the vane of the upper or lower bearing, and an electrically or mechanically actuated valve body is provided in the communication port. .