Electronic expansion valve control method, control device and heat pump water heater

A technology for electronic expansion valves and heat pump water heaters, applied in the field of heat pump water heaters, electronic expansion valve control methods, and control devices, can solve the problem of unreasonable initial opening value setting of electronic expansion valves and optimal initial opening value of electronic expansion valves Different, the electronic expansion valve adjusts the valve for a long time, etc., to improve the efficiency of hot water production, the control method is simple and direct, and the effect of avoiding the danger of starting the liquid

Active Publication Date: 2019-11-01
QINGDAO HAIER NEW ENERGY ELECTRIC APPLIANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the initial steps of the electronic expansion valve are mainly obtained by experiments, ignoring the problem of different optimal initial opening values ​​of the electronic expansion valve caused by different water temperatures.
Therefore, the setting of the initial opening value of the electronic expansion valve under different ambient temperatures and water temperatures is unreasonable, and the valve adjustment time of the electronic expansion valve during operation is long, which in turn reduces the performance of the unit and may cause the start-up suction to carry liquid and other reliability issues

Method used

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  • Electronic expansion valve control method, control device and heat pump water heater
  • Electronic expansion valve control method, control device and heat pump water heater
  • Electronic expansion valve control method, control device and heat pump water heater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 1 As shown, the present invention provides a control method of an electronic expansion valve, and the reference value P of the electronic expansion valve is obtained according to the ambient temperature value of the heat pump water heater. 基准 , and according to the current water temperature value in the water tank of the heat pump water heater, the revised water temperature value of the electronic expansion valve Ρ 水温修订 , according to the revised value Ρ of the electronic expansion valve water temperature 水温修订 The reference value P of the electronic expansion valve 基准 Based on the revision, the initial opening value Ρ of the electronic expansion valve is obtained 初始 .

[0042]In this embodiment, the electronic expansion valve 3 can adjust the output to meet the needs of the heat exchanger, so that the entire heat pump water heater system can work in harmony to maximize efficiency; and the precise control of the electronic expansion valve 3 determines t...

Embodiment 2

[0072] Such as figure 2 As shown, after step S2 reads the ambient temperature of the heat pump water heater and the current water temperature in the water tank of the heat pump water heater, the revised value P of the water temperature of the electronic expansion valve corresponding to the current water temperature is obtained. 水温修订 ; Read the ambient temperature of the heat pump water heater again, and when the read ambient temperature is within the deviation range, then obtain the corresponding reference value of the electronic expansion valve Ρ 基准 .

[0073] Therefore, the control method described in this embodiment is as follows:

[0074] S1, boot up;

[0075] S2. Read the ambient temperature of the heat pump water heater and the current water temperature in the water tank of the heat pump water heater, and obtain the revised value Ρ of the water temperature of the electronic expansion valve corresponding to the current water temperature 水温修订 ; Read the ambient tempera...

Embodiment 3

[0082] Such as image 3 As shown, the control device includes a water temperature sensor arranged in the water tank, an ambient temperature sensor 12 arranged outside the water tank, an electronic expansion valve 3 and a control module, wherein the water temperature sensor, the ambient temperature sensor 12 and the electronic The expansion valves 3 are all connected to the control module;

[0083] Wherein, the control module calculates the initial opening value of the electronic expansion valve according to the received ambient temperature and current water temperature information, and controls the electronic expansion valve 3 to the initial opening value.

[0084] Further, the water temperature sensor includes at least one, and is uniformly distributed in the water tank; and / or the ambient temperature sensor 12 includes at least one, and is evenly distributed around the heat pump water heater.

[0085] Specifically, the control module further includes a receiving unit, a jud...

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Abstract

The invention discloses a control method for an electronic expansion valve, a control device and a heat pump water heater. The control method comprises the steps that the reference value P reference of the electronic expansion valve is obtained according to the ambient temperature value of the heat pump water heater, the water temperature revision value P water temperature revision of the electronic expansion valve is obtained according to the current water temperature numerical value in a water tank of the heat pump water heater, the revision is conducted according to the water temperature revision value P water temperature revision of the electronic expansion valve based on the reference value P reference of the electronic expansion valve, and the initial opening value P initial of the electronic expansion valve is obtained. According to the control method, the initial opening value of the electronic expansion valve is adjusted according to the current water temperature numerical value in the water tank of the heat pump water heater, so that it is avoided that when the machine is started, the initial opening value of the electronic expansion valve is inaccurate due to the different current water temperatures, and consequently the energy is wasted, the energy is saved, accordingly the control method for the heat pump water heater is optimized, and the control device and the heat pump water heater are simple in structure, high in practicability and suitable for popularization.

Description

technical field [0001] The invention relates to the field of water heaters, in particular to a control method, a control device and a heat pump water heater for an electronic expansion valve. Background technique [0002] The existing electronic expansion valve is a fully sealed, high-precision flow control valve, which mainly controls the flow of the working medium by the control system by changing the opening size of the valve port, and is equipped with a corresponding control circuit to realize a fully automatic closed-loop It has the advantages of large flow adjustment range, high control precision, fast adjustment speed, and fluorine resistance. It can realize automatic adjustment of temperature, and has the characteristics of saving energy, unloading and starting, automatic defrosting, and prolonging the service life of the whole machine. And the electronic expansion valve is a throttling device that uses electrical signals to directly control the current or voltage o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24H9/20F24H4/02G05D7/06
CPCF24H4/02F24H9/2007G05D7/0623
Inventor 黄娟
Owner QINGDAO HAIER NEW ENERGY ELECTRIC APPLIANCE
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