Ultralow temperature heat pump control system

Abstract

The invention provides an ultralow temperature heat pump control system. The ultralow temperature heat pump control system comprises a circulating main loop and a circulating auxiliary loop, wherein the circulating main loop is composed of an evaporator, a compressor, a condenser and a first electronic expansion valve, and the circulating auxiliary loop is composed of a second electronic expansionvalve and an electromagnetic valve. The ultralow temperature heat pump control system further comprises a sampling unit, a compressor drive unit and a main control unit. The evaporator and the sampling unit are electronically connected with the main control unit. The compressor drive unit is electrically connected between the compressor and the main control unit. The main control unit is furtherelectrically connected with the first electronic expansion valve, the second electronic expansion valve and the electromagnetic valve. The sampling unit is used for measuring temperature signals in real time and outputs the temperature signals to the main control unit. The compressor dive unit is used for outputting drive signals to the compressor according to the output of the main control unit.The main control unit controls a first opening degree of the first electronic expansion valve and a second opening degree of the second electronic expansion valve according to the temperature signalsand then adjusts the suction superheat degree of the compressor and the exhaust superheat degree of the compressor.

Description

technical field [0001] The invention relates to a control circuit in the technical field of electric heating systems, more specifically, to an ultra-low temperature heat pump control system. Background technique [0002] At present, the frequency conversion heat pumps of various domestic frequency conversion heat pump manufacturers cannot coordinate and coordinate all aspects of technology well, cannot achieve high-efficiency and energy-saving control effects, or have problems such as unsatisfactory heating effects at low ambient temperatures, while some foreign frequency conversion heat pumps control However, the device has the disadvantages that the price is too high and does not meet the usage habits of domestic users. Therefore, there is an urgent need for a self-developed high-efficiency, energy-saving, cost-effective frequency conversion heat pump controller that can adapt to ultra-low ambient temperatures. [0003] In addition, the current mainstream low-temperature ...

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Problems solved by technology

[0003] In addition, the current mainstream low-temperature heat pump system cannot work normally in areas with large voltage fluctuations. Because the coal-to-electricity heat pump units are turned on intensively, the country lags behind in power grid transformation and matching. In some areas, after the heat pumps are turned on at night, resulting in The voltage of the entire area is lower than the allowable voltage of the heat pump, so that the heat pump equipment cannot effectively provide heating to users under low voltage conditions

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