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Control method and device of electronic expansion valve

A technology of electronic expansion valve and control method, which is applied in heating and ventilation control systems, refrigerators, heating methods, etc., can solve problems such as instability, refrigerant system failure, and electronic expansion valve automatic adjustment function failure, and achieve reduction The effect of safe and stable use and operation and cost reduction

Active Publication Date: 2015-11-25
TCL AIR CONDITIONER ZHONGSHAN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the air-conditioning refrigerant system is working, if the temperature sensor at any of the compressor return pipe, evaporator coil and condenser coil fails, the automatic adjustment function of the electronic expansion valve will fail, resulting in Refrigerant system failure or instability

Method used

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  • Control method and device of electronic expansion valve
  • Control method and device of electronic expansion valve
  • Control method and device of electronic expansion valve

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Embodiment Construction

[0046] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0047] Such as Figure 1 to Figure 3 as shown, figure 1 It is a flow chart of a preferred embodiment of the electronic expansion valve control method of the present invention, figure 2 is the invention figure 1 In the flow chart of the third embodiment of step S30, image 3 is the invention figure 1 The flowchart of the fourth embodiment of step S30; Figure 7 It is a schematic diagram of the flow of refrigerant in the air-conditioning system during cooling. Figure 8 It is a schematic diagram of the flow of refrigerant in the air conditioning system during heating.

[0048] refer to figure 1 , the method for controlling the electronic expansion valve mentioned in this embodiment includes:

[0049] Step S10, periodically acquiring the current operating frequency and exhaust temperature of the compressor;

[...

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Abstract

The invention discloses a control method and device of an electronic expansion valve. Due to the facts that the opening degree of the electronic expansion valve can be adjusted only by obtaining the operating frequency and exhaust temperature of a compressor, and the operating frequency of the compressor can be directly obtained from a variable frequency control system of the compressor, so that only a temperature sensor for sensing and obtaining the exhaust temperature of the compressor is needed, and the number of temperature sensors in use is decreased. Normal operation of the electronic expansion valve can be ensured as long as the temperature sensor for sensing and obtaining the exhaust temperature of the compressor does not break down, so that reliability of the electronic expansion valve is improved, and meanwhile the cost for the temperature sensor is reduced. By means of the control method or device of the electronic expansion valve, a variable-frequency air conditioner system or a variable-frequency water heating pump system or the like operates more safely and stably, and the required cost for the temperature sensor is reduced.

Description

technical field [0001] The invention relates to the technical fields of frequency conversion refrigeration and heating, in particular to a control method and device for an electronic expansion valve. Background technique [0002] At present, electronic expansion valves with automatic opening adjustment are used in most air-conditioning refrigerant systems to ensure the safety and stability of the compressor and the entire refrigerant system. [0003] The current method of automatically adjusting the opening of the electronic expansion valve is: use the temperature sensor to obtain the evaporator coil temperature Tc and the compressor return air temperature To, so as to obtain the temperature difference between the compressor return air temperature To and the evaporator coil temperature Tc SH, that is, degree of superheat SH=To-Tc; then compare the obtained degree of superheat SH with the set target degree of superheat ΔSH to determine the opening degree of the electronic exp...

Claims

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Application Information

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IPC IPC(8): F25B49/02F24F11/00
Inventor 王小军温得贤
Owner TCL AIR CONDITIONER ZHONGSHAN CO LTD
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