Control method of cooling air quantity of outdoor condenser
A control method and technology of cooling air volume, which is applied in the field of outdoor condenser cooling air volume control and automatic control of outdoor condenser cooling air volume, and can solve the problems of large air inlet area, shortened service life of fans, unstable evaporation temperature, etc. , to achieve the effect of saving manpower, reliable control and simple structure
Inactive Publication Date: 2016-07-13
QINGDAO UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, and propose a method for controlling the cooling air volume of an outdoor condenser to solve the problems of manually adjusting the area of the air inlet, such as large workload, poor precision, and large energy consumption, and solve the problem of using pressure control Condensing pressure fluctuations, unstable evaporation temperature and shortened service life of fans caused by increasing or decreasing the number of working fans
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[0016] The cooling air volume control process of the outdoor condenser involved in this embodiment includes three parts: electrical signal conversion, control of the exhaust air volume of the frequency conversion fan, and control of the air intake volume of the electric air valve. The specific control process is as follows:
[0017] (1) Electrical signal conversion: the internal condensing pressure of the condenser liquid collecting main pipe 7 is transmitted from the condensing pressure capillary 11 to the condensing pressure sensor 1, and the condensing pressure sensor 1 converts the condensing pressure into a voltage greater than 0 and less than 10V or a current greater than 4mA and less than 20mA The electrical signal, the electrical signal of the condensation pressure sensor 1 increases with the increase of the condensation pressure, and the electrical signal of the condensation pressure sensor 1 decreases with the decrease of the condensation pressure, so as to realize the...
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The invention belongs to the technical field of control of cooling air quantity of refrigeration equipment and relates to a control method of cooling air quantity of an outdoor condenser. A control process comprises three parts including electric signal conversion, control of exhausting quantity of frequency conversion draught fans and control of air inlet quantity of an electric air valve, wherein condensation pressure is transmitted to a condensation pressure sensor from a condensation pressure capillary tube; the condensation pressure sensor is used for converting the condensation pressure to electric signals of voltage or current; a central PLC (Programmable Logic Controller) is used for outputting the signals to a draught fan frequency converter and an alternating-current contactor, respectively; the draught fan frequency converter is used for transmitting electric energy to the two frequency conversion draught fans according to the electric signals and controlling the working frequency and the rotary speed of the frequency conversion draught fans; an electric air valve controller is used for transmitting the electric energy to an electric performer of the electric air valve according to the electric signals and controlling forward and backward rotation and movement ratios of the electric performer of the electric air valve, so that linear control is realized; and the air inlet quantity can be automatically and linearly controlled, and the control method has the advantages of scientific control principle, simple and convenient process, high control precision, low energy consumption, long service life and reliability in controlling.
Description
Technical field: [0001] The invention belongs to the technical field of cooling air volume control of refrigeration equipment, and relates to a method for controlling the cooling air volume of an outdoor condenser, in particular to a method for automatically controlling the cooling air volume of an outdoor condenser according to the condensation pressure in an outdoor extremely low temperature environment. Background technique: [0002] At present, the outdoor condensers of refrigeration equipment such as industrial air-conditioning units and cold storage units are generally finned tube heat exchangers with fans, which reduce the condensation temperature by raising the temperature of the circulating air and taking away heat. This heat exchange method has a high heat exchange efficiency in the season when the outdoor ambient temperature is low, but when the outdoor ambient temperature is extremely low, the operation and production will be affected due to the low-voltage protec...
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IPC IPC(8): F24F11/00
CPCF24F11/83F24F11/30F24F11/84F24F2110/00
Inventor 刘瑞璟李进田小亮王德昌郑艺华
Owner QINGDAO UNIV