A control method for preventing refrigerant from returning to liquid in a multi-connected air conditioner indoor unit
A technology of a multi-connected air conditioner and a control method is applied to the control of a multi-connected air conditioner and the control field of preventing the refrigerant from returning to the indoor unit of the multi-connected air conditioner, and can solve the problems affecting the user's feeling, reducing the heat exchange, and reducing the refrigerant flow rate. Low problems, to achieve the effect of reasonable design, simple control, and improved comprehensive performance
Active Publication Date: 2020-12-22
NANJING TICA AIR CONDITIONING CO LTD
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Problems solved by technology
Using the above means can indeed reduce the risk of liquid return to a certain extent. However, in order to ensure an absolutely safe superheat, the opening of the electronic expansion valve must be controlled at a relatively low level. The reduction will affect the user's experience
Method used
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0022] Such as figure 1 shown.
[0023] A multi-connected air conditioning system, comprising an outdoor unit and a plurality of parallel indoor units; the outdoor unit includes a compressor 1, an outdoor unit heat exchanger 5 and a gas-liquid separator 2; each of the indoor units includes an indoor unit Electronic expansion valve 4 and indoor unit heat exchanger 3; the inlet and outlet of the indoor unit heat exchanger 3 are respectively provided with a first temperature sensor T1 and a second temperature sensor T2; the inlet and outlet of the gas-liquid separator 2 The third temperature sensor T3 and the fourth temperature sensor T4 are respectively provided; the fifth temperature sensor T5 is provided on the top of the compressor 1; the inlet of the gas-liquid separator 2 is also provided with a system low pressure sensor P1; the outdoor unit The i...
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The invention relates to a control method for preventing refrigerant return of multi-split air conditioner indoor units. An outdoor unit and the plurality of indoor units connected in parallel are involved in the control method, the outdoor unit comprises a compressor, an outdoor unit heat exchanger and a gas-liquid separator, each indoor unit comprises an indoor unit electronic expansion valve and an indoor unit heat exchanger, and the top of the compressor, inlets and outlets of the indoor unit heat exchangers, and an inlet and an outlet of the gas-liquid separator are correspondingly provided with temperature sensors. The opening degree of the electronic expansion valves of the indoor unit heat exchangers can be jointly controlled through comprehensive consideration about superheat degree values of outlets of the indoor units, a pressure-top superheat degree value of the compressor, a superheat degree value of the outlet of the gas-liquid separator, a system low-pressure value and the like, the contradiction between the cooling capacity and the liquid return risk of the indoor units is balanced, and the comprehensive performance of the multi-split refrigeration system is improved.
Description
technical field [0001] The invention relates to an air conditioner control method, in particular to a multi-connected air conditioner control method, in particular to a control method for preventing the refrigerant from returning to the indoor unit of the multi-connected air conditioner. Background technique [0002] At present, in refrigeration and air-conditioning systems, the liquid return phenomenon caused by the inability of the indoor unit refrigerant to evaporate completely is an important cause of compressor damage. Therefore, liquid return should be avoided as much as possible in the operation control of multiple units. In a general multi-connected system, in order to prevent liquid return, temperature sensors are usually arranged at the inlet and outlet of each indoor unit (behind the electronic expansion valve) and the mid-pane position to detect the superheat of the indoor unit refrigerant and the temperature of the mid-pane, and pass The degree of superheat of t...
Claims
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IPC IPC(8): F24F11/30
CPCF25B2313/0233F25B2313/0314F25B2600/21F25B2600/2513F25B2700/2113F25B2700/21152F24F11/30
Inventor 傅玮杨亚华杨兵易博
Owner NANJING TICA AIR CONDITIONING CO LTD