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

A technology of exhaust temperature and protection control, applied in heat pumps, refrigerators, refrigeration components, etc., can solve the problems of unstable system pressure, poor control stability, protection lag, etc., to achieve stable system pressure, ensure pressure balance, and solve the reaction lag effect

Active Publication Date: 2022-04-12
GUANGDONG NEW ENERGY TECH DEV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[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 energy efficiency; when the exhaust temperature is high, the traditional technology periodically opens the electronic expansion valve until the exhaust temperature drops to a certain range, and cannot maintain a stable exhaust temperature according to the system load requirements. Electronic expansion valve control and compressor frequency control Uncoordinated, unstable system pressure

Method used

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

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Effect test

Embodiment 1

[0042] A method for protection and control of excessive exhaust temperature of a frequency conversion heat pump, which is used for a frequency conversion heat pump unit, the frequency conversion heat pump unit includes a compressor, and the control method includes the following steps: when the frequency conversion heat pump unit is in a running state, collecting the temperature of the compressor Exhaust temperature: When the exhaust temperature of the heat pump unit is too high, adjust the frequency of the compressor and the electronic expansion valve to stabilize the exhaust temperature in a suitable range through the temperature section, ensuring the safety of the unit and having high energy efficiency; the control process In the process, the compressor frequency adjustment and the electronic expansion valve adjustment control are carried out simultaneously without interfering with each other.

[0043] When it is detected that the exhaust gas temperature is in the temperature...

Embodiment 2

[0070] Further, it also includes an electronic expansion valve control method, the electronic expansion valve control method is: when the exhaust gas temperature is ≥ 105°C, the electronic expansion valve enters the high exhaust control logic, and the electronic expansion valve opens a large ΔP 1 Step; start timing, check the exhaust temperature every 15 seconds, and judge the change value of the exhaust temperature ΔT; when the exhaust temperature is ≤100°C, exit the high-exhaust electronic expansion valve control, and the electronic expansion valve returns to normal control; ΔT= Last exhaust temperature - current exhaust temperature.

[0071] If ΔT2 step, the exhaust temperature detection cycle is reduced to once every 5S; if -1≤ΔT3 step, the exhaust temperature detection cycle is reduced to once every 10S; if 0≤ΔT4 step; if 1≤ΔT≤2℃, the electronic expansion valve opens to increase ΔP 5 step; if ΔT>2°C, the opening of the electronic expansion valve remains unchanged.

[007...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B30/02F25B49/02
CPCF25B30/02F25B49/022
Inventor 赵密升肖威
Owner GUANGDONG NEW ENERGY TECH DEV
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