Suction pressure control method for DC frequency conversion multi-line refrigeration operation
A suction pressure, DC frequency conversion technology, used in heating and ventilation control systems, heating methods, household heating and other directions, can solve the problems of the compressor suction pressure cannot be accurately controlled, cannot judge the suction pressure, etc., and achieve the running state. Best, guaranteed matching effect
Active Publication Date: 2015-12-23
NANJING TICA AIR CONDITIONING CO LTD
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Problems solved by technology
[0003] The purpose of the present invention is to solve the problem that the existing compressor suction pressure cannot be accurately controlled and it is impossible to judge whether the current suction pressure matches the operating state of the internal unit, and to invent a DC variable frequency multi-line refrigeration operation suction pressure control method, through which the suction pressure of multi-line refrigeration can be accurately controlled, and its rationality can be judged by the operating state of the internal unit, and if it is unreasonable, it will be changed until the suction pressure matches the operating state of the internal unit
Method used
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[0019] The present invention and its specific implementations will be described in further detail below in conjunction with the accompanying drawings.
[0020] Such as figure 1 shown.
[0021] The multi-split unit of the present invention is formed by connecting one outdoor unit, multiple indoor units, and the indoor and outdoor units through connecting pipes. The outdoor unit is mainly composed of a compressor 1, an oil separator 2, a four-way valve 3, an outdoor unit heat exchanger 4, an outdoor unit throttle assembly 5, a liquid valve 6, an air valve 9, and a gas-liquid separator 10; A pressure sensor 12 is arranged on the air return pipe for detecting the suction pressure of the system. The indoor unit is mainly composed of a throttling assembly 7 and an indoor unit heat exchanger 8; a temperature sensor 11 is arranged at the inlet of the indoor unit heat exchanger.
[0022] figure 1 The control method for the suction pressure of the DC frequency conversion multi-line ...
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Provided is a method for controlling the refrigerating running suction pressure of a direct current frequency conversion multi-line unit. The operating frequency of a direct current frequency inverter compressor is changed to adjust the suction pressure of the unit. The method is characterized in that the current suction pressure is judged to be reasonable or not according to the operating state of an internal machine, and if not reasonable, a target suction pressure value is changed. The operating state of the internal machine is determined through the temperature of a feeding tray of a heat exchanger of the internal machine and the corresponding saturation temperature of current target suction pressure, and accuracy and reliability are achieved. Through the method, the refrigerating running suction pressure of the direct current frequency conversion multi-line unit can be controlled precisely, meanwhile, the good operating state of the refrigerating internal machine is guaranteed, the refrigerating running suction pressure of the unit is made to be adaptive to the operating state of an indoor unit, and matching of operating of the indoor unit and operating of an outdoor unit is guaranteed.
Description
technical field [0001] The invention relates to the technical field of multi-connected air-conditioning systems, in particular to a method for controlling the suction pressure, in particular to a method for controlling the suction pressure of DC frequency conversion multi-connected cooling operation. Background technique [0002] The suction pressure of the multi-line refrigeration operation reflects the operating status of the internal unit and also affects the safe and reliable operation of the compressor. All air conditioner manufacturers have strict requirements on the suction pressure control during cooling operation. For the determination of the target suction pressure, it is necessary to consider not only the operating state of the internal unit, but also the safe operation of the compressor. The current processing methods mostly use the difference between the return air temperature and the supply air temperature of the internal unit to adjust the operating frequency...
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IPC IPC(8): F24F11/00
Inventor 易博蒋立杨兵程卓明
Owner NANJING TICA AIR CONDITIONING CO LTD