Capacity Variable Type Rotary Compressor and Driving Method Thereof and Driving Method for Air Conditioner Having the Same

Abstract

In a capacity variable type rotary compressor, its operation method and an operation method of an air conditioner having the same, a plurality of discharge holes are formed, and one of the discharge holes is connected to a bypass hole, which is opened and closed by a sliding valve according to a pressure difference, so as to be selectively connected to an intake hole. Accordingly, a cooling capability lowering rate is increased during capacity varying operation of the compressor, such that the air conditioner can be variously controlled, and unnecessary power consumption of the compressor and the air conditioner having the same can be reduced.Also, by using a pilot valve which is economical and reliable, back pressure of the sliding valve can be speedily and accurately switched. Accordingly, the capacity variable device in accordance with the present invention can be widely used for a compressor or an air conditioner that should perform frequent cooling capability control, and efficiency degradation thereof can be prevented from occurring.

Description

TECHNICAL FIELD[0001]The present invention relates to a capacity variable type rotary compressor, and particularly, to a capacity variable type rotary compressor, an operation method thereof and an operation method for an air conditioner having the same capable of controlling cooling capability by discharging a refrigerant gas of a compression chamber accordingly.BACKGROUND ART[0002]In general, a rotary compressor is used for an air conditioner. As functions of the air conditioner are diversified, a rotary compressor that can vary its capacity is being required.[0003]As techniques for varying the capacity of the rotary compressor, the so called an inverter method of controlling the revolutions of the compressor by employing an inverter motor has been well known. However, this technique is problematic for the following reasons. First, the inverter motor itself is expensive, which causes an increase in unit cost. Also, even though most air conditioners are used as cooling devices, imp...

AI Technical Summary

Benefits of technology

[0015]In a capacity variable type rotary compressor, its operation method and an operation method of an air conditioner having the same, a plurality of discharge holes are formed, and one of the discharge holes is connected to a bypass hole, which is opened and closed by a sliding valve according to a pressure difference, so as to be selectively connected to an intake hole. Accordingly, a cooling capability lowering rate is increased during capacity varying operation of the compressor, such that the air conditioner can be variously controlled, and unnecessary power consumption of the compressor and the air conditioner having the same can be reduced.

[0016]Also, by using a pilot valve which is economical and reliable, back pressure of the sliding valve can be speedily and accurately switched. Accordingly, the capacity variable device in accordance with the present invention can be widely used for a compressor or an air conditioner that should perform frequent cooling capability control, and efficiency degradation thereof can be prevented from occurring.

Problems solved by technology

However, this technique is problematic for the following reasons.

First, the inverter motor itself is expensive, which causes an increase in unit cost.

Also, even though most air conditioners are used as cooling devices, improving cooling capability under cool circumstances is more difficult than improving the cooling capability under warm circumstances.

However, because refrigerant bypasses through the valve, most capacity variable compressors employing the idling or compression conversion technique have the disadvantage of the high resistance of bypass circuit.

Also, because those compressors cannot speedily switch their operation modes, there is a limit in using them for compressors or air conditioners that require frequent cooling capability control.

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