A Protection and Control Method for Excessive Exhaust Temperature of Inverter Heat Pump

Abstract

The invention discloses a protection and control method for excessively high discharge temperature of a frequency conversion heat pump, which is used for a frequency conversion heat pump unit. The rate is increased by 1HZ every 30S; if the compressor is in frequency reduction or stable frequency, it will remain unchanged; when the exhaust temperature is lower than the temperature section of the frequency ramp-up zone, the compressor frequency control rate will return to the normal rate; when the exhaust gas is detected When the temperature is in the temperature range of the stable frequency reduction zone, the exhaust temperature is detected every 30S. If the exhaust temperature rises greater than or equal to 2 degrees every 30S, the frequency will be reduced; if the exhaust temperature rises less than 2 degrees every 30S or The exhaust temperature does not rise, and the frequency remains unchanged; when it is detected that the exhaust temperature is in the temperature range of the rapid frequency reduction zone, the frequency will be reduced. The invention adopts segmental control of the discharge temperature, simultaneous control of compressor frequency adjustment and electronic expansion valve adjustment, quickly controls the discharge temperature within a safe range, and ensures system pressure balance.

Description

technical field

[0001] This patent belongs to the field of heat pump control, and relates to a protection and control method for excessive exhaust temperature of a frequency conversion heat pump. Background technique

[0002] When the exhaust temperature of the traditional heat pump control is higher than the safe temperature, the frequency is reduced or shut down for protection, the frequency repeats waveform, the system pressure changes greatly, the control stability is poor, the energy efficiency is poor, and the protection lag is prone to occur, and the risk of compressor damage; traditional technology There is no frequency partition control according to different exhaust temperature ranges. When the exhaust temperature is high, the frequency is reduced rapidly, and the exhaust temperature drops rapidly. After exiting the exhaust frequency reduction, the exhaust temperature rises rapidly, and the frequency and exhaust temperature keep fluctuating. Poor stability and poor...

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