Heat pump water heater electronic expansion valve control method and heat pump water heater
A technology of electronic expansion valve and heat pump water heater, which is applied in fluid heaters, lighting and heating equipment, energy-saving heating/cooling, etc. It can solve the problems affecting the performance of the system, the delay of electronic expansion valve, and the relatively long time to restore the temperature, etc. problem, to achieve the effect of improving heating efficiency, high heating efficiency and stable performance
Active Publication Date: 2019-11-05
QINGDAO ECONOMIC & TECHN DEV ZONE HAIER WATER HEATER +1
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Problems solved by technology
[0003] The above control method can meet the needs of the heat pump water heater during normal operation, but when the working state of the heat pump water heater changes greatly, such as when the heat pump water heater is just turned on, after defrosting, or when the temperature change rate of the water tank is very large, the above control method makes the electronic The expansion valve has a large delay and cannot quickly enter the optimal working state. It takes a long time for the system to recover the temperature, which affects the performance of the system capacity, and then affects the heating effect of the heat pump water heater.
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Embodiment 1
[0031] This embodiment provides a heat pump water heater, such as figure 1 As shown, it includes a heat pump system, a water tank 1 and a controller 2. The heat pump system includes a compressor 3 connected through pipelines, a four-way reversing valve 4, an indoor heat exchanger 5 wound on the inner wall of the water tank 1, and an electronic expansion The valve 6, the outdoor heat exchanger 7, and the controller 2 are respectively connected with the four-way reversing valve 4 and the electronic expansion valve 6. The water tank 1 is provided with a second temperature sensor 9 for detecting the water temperature of the water tank 1 , and the second temperature sensor 9 is connected with the controller 2 . In addition, the controller 2 is also connected with a first temperature sensor 8 for detecting the ambient temperature.
[0032] When the heating program is running, the compressor 3 compresses the refrigerant into high-temperature and high-pressure gas, and the gaseous re...
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The invention discloses a control method for an electronic expansion valve of a heat-pump water heater and the heat-pump water heater and relates to the technical field of water heaters. The control method and the heat-pump water heater can solve the problem that an electronic expansion valve can not quickly get to the optimal operation state when the operation state of an existing heat-pump water heater changes a lot. The control method for the electronic expansion valve of the heat-pump water heater includes the steps that after the heat-pump water heater is started or the defrosting process is ended or when the change rate of water temperature of a water tank exceeds the preset value of the change rate of water temperature, the step value P of the electronic expansion valve is worked out according to the currently detected environment temperature and the water temperature of the water tank, and the electronic expansion valve operates within a preset period of time according to the step value P worked out. According to the control method for the electronic expansion valve, the step value much approximate to the optimal operation state of the electronic expansion valve is obtained through calculation, delay of the electronic expansion valve caused by changes of the operation state is eliminated, a heat pump system can recover to the stable state fast, and the heating efficiency of the heat pump system is greatly improved.
Description
technical field [0001] The invention relates to the technical field of water heaters, in particular to a method for controlling an electronic expansion valve of a heat pump water heater and a heat pump water heater adopting the control method. Background technique [0002] In order to improve energy utilization efficiency, more and more attention has been paid to the use of heat pump devices to provide domestic hot water. Existing heat pump water heaters generally adopt the PID adjustment (Proportional Integral Derivative control) method to control the opening of the electronic expansion valve during heating operation, that is, the electronic expansion valve is determined each time according to the difference between the target superheat degree and the actual superheat degree. valve step. [0003] The above control method can meet the needs of the heat pump water heater when it is in normal operation, but when the working state of the heat pump water heater changes greatly,...
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IPC IPC(8): F24H9/20F24H4/02
CPCY02B30/12
Inventor 黄娟杨磊陈炳泉
Owner QINGDAO ECONOMIC & TECHN DEV ZONE HAIER WATER HEATER