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US 8,006,504 B2Granted
Air conditioning system
AssigneeLG Electronics Inc.
InventorsYoung Hwan Ko, Bum Suk Kim, Man Ho Chun, Sang Kyoung Park
Life of this patent
Estimating the term…
Abstract
It is possible to prevent that a liquid refrigerant is included in a refrigerant injected into a compressor. Accordingly, the risk of liquid compression of the compressor is greatly reduced, thereby decreasing the possibility of damage to the compressor and improving reliability and performance.
Claims15
An air conditioning system, comprising:
- a condenser for condensing a refrigerant;
- an evaporator for evaporating the refrigerant passed through the condenser;
- a compressor for compressing the refrigerant passed through the evaporator and a refrigerant injected after being branched from the refrigerant flowing from the condenser to the evaporator;
- and
- a control unit for judging whether a liquid refrigerant is included in the injected refrigerant,
- wherein, if at least one of operating parameters is out of a preset normal operating range, the control unit judges that a liquid refrigerant is included in the injected refrigerant, and
- wherein the operating parameters include the discharge temperature and discharge pressure of the compressor, the inlet side temperature of the evaporator, the indoor temperature and outdoor temperature of the air conditioning system, and the current applied to the compressor.
4 more elements
An air conditioning system, comprising:
- a condenser for condensing a refrigerant;
- an evaporator for evaporating the refrigerant passed through the condenser;
- a compressor for compressing the refrigerant passed through the evaporator and a refrigerant injected after being branched from the refrigerant flowing from the condenser to the evaporator;
- and
- a control unit for judging whether a liquid refrigerant is included in the injected refrigerant,
- wherein, if at least one of operating parameters is out of a preset normal operating range, the control unit judges that a liquid refrigerant is included in the injected refrigerant,
- wherein the injected refrigerant flows through an injection pipe at which an injection valve is disposed, and
- if the operating parameter is out of the normal operating range, the injection valve is closed for a first set time,
- wherein, if the number of times of the operating parameter being out of the normal operation range exceeds a set number of times, the injection valve is closed for a second set time which is longer than the first set time.
6 more elements
An air conditioning system, comprising:
- a condenser for condensing a refrigerant;
- an evaporator for evaporating the refrigerant passed through the condenser;
- a compressor for compressing the refrigerant passed through the evaporator and a refrigerant injected after being branched from the refrigerant flowing from the condenser to the evaporator;
- and
- a control unit for judging whether a liquid refrigerant is included in the injected refrigerant, and
- further comprising an injection pipe through which the injected refrigerant flows, a bypass pipe for connecting the injection pipe and a discharge pipe of the compressor, and a bypass valve disposed on the bypass pipe, and
- if it is judged that a liquid refrigerant is included in the injected refrigerant, the control unit controls the bypass valve to be opened so that the refrigerant bypassed from the compressor heats the refrigerant injected into the compressor.
4 more elements
air conditioning system, comprising:
- a condenser for condensing a refrigerant;
- an evaporator for evaporating the refrigerant passed through the condenser;
- a compressor for compressing the refrigerant passed through the evaporator and a refrigerant injected after being branched from the refrigerant flowing from the condenser to the evaporator;
- and
- a control unit for judging whether a liquid refrigerant is included in the injected refrigerant, and
- further comprising an injection pipe through which the injected refrigerant flows and a heater disposed on the injection pipe, and
- if it is judged that a liquid refrigerant is included in the injected refrigerant, the control unit operates the heater to heat the injected refrigerant.
4 more elements
An air conditioning system, comprising:
- a condenser for condensing a refrigerant;
- a first expansion device for throttling the refrigerant passed through the condenser;
- a second expansion device for throttling the refrigerant passed through the first expansion device;
- an evaporator for evaporating the refrigerant passed through the second expansion device;
- a compressor having a first compressing part for compressing the refrigerant passed through the evaporator and a second compressing part for compressing both of the refrigerant passed through the first compressing part and a refrigerant injected after branched between the first expansion device and the second expansion device;
- an injection valve for adjusting the amount of refrigerant injected into the second compressing part;
- and
- a control unit for, if it is judged that a liquid refrigerant is included in the injected refrigerant, controlling the injected refrigerant is to be heated.
5 more elements
Dependencies are inferred from the claim text.