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System and method for controlling electronic expansion valve of air conditioner, and multi-split air conditioner outdoor unit

A technology of electronic expansion valve and control system, which is applied in the direction of air conditioning system, heating and ventilation control system, refrigerator, etc., and can solve the problem of system deviation from the operating state

Inactive Publication Date: 2014-06-11
MIDEA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide an air conditioner electronic expansion valve control system applied to multi-connected outdoor units, aiming to solve the problem that the traditional control method can easily cause the system to deviate from the optimal operating state due to small detection error values

Method used

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  • System and method for controlling electronic expansion valve of air conditioner, and multi-split air conditioner outdoor unit
  • System and method for controlling electronic expansion valve of air conditioner, and multi-split air conditioner outdoor unit
  • System and method for controlling electronic expansion valve of air conditioner, and multi-split air conditioner outdoor unit

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Experimental program
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Effect test

Embodiment 1

[0045] Such as Figure 5 As shown in the work flow chart, the control method is mainly used to control the work of the external unit of the multi-connected air conditioner, and the control method of the electronic expansion valve of the air conditioner includes the following steps:

[0046] Step S100, opening the electronic expansion valve with an initial opening degree according to the ambient temperature. Specifically, first determine an appropriate initial opening degree N0 of the electronic expansion valve based on the detected ambient temperature and the operating mode set by the air-conditioning system, for example, the opening degree of 280 steps. The air-conditioning system and the electronic expansion valve will reach an steady state of operation.

[0047] Step S200, regularly acquire the superheat degree of the discharge temperature of the compressor. Specifically, the air-conditioning system detects the discharge pressure Pd of the compressor (that is, the dischar...

Embodiment 2

[0053] Such as Figure 6 As shown, step S200 includes step S210 and step S220.

[0054] Step S210, obtaining the discharge pressure of the compressor within a preset time, and obtaining the corresponding saturation temperature Ts according to the discharge pressure. Use the compressor discharge pressure sensor to detect the discharge pressure Pd of the compressor, and find out the saturation temperature Ts under the discharge pressure Pd according to the refrigerant parameter table of the pre-installed refrigerant in the air conditioning system. In actual situations, the air-conditioning system presets the refrigeration parameter table in the control system, which can be searched and called during the operation of the system.

[0055] Step S220, obtain the average discharge temperature of the compressor within the preset time, and obtain the superheat degree of the discharge temperature through the difference between the average discharge temperature and the saturation temper...

Embodiment 3

[0057] In Embodiment 3 of the present invention, Step S100 and Step S200 are the same as Embodiment 1 or Embodiment 2, while Steps S300 and S400 are different.

[0058] Such as Figure 7 As shown, step S300 includes step S301 and step S302, and step S400 includes step S401 and step S402.

[0059] Step S301, judging whether the degree of superheat of the exhaust gas temperature is greater than the preset reasonable temperature range, if the degree of superheat of the exhaust gas temperature is greater than the preset reasonable temperature range, then perform step S401, that is, according to the current superheat degree of the exhaust gas temperature The preset adjustment range increases the initial opening. As shown in Table 1 above, for example, when it is detected that the superheat of the exhaust gas temperature is Tn ≥ T0+b, the controller will execute the action of opening the electronic expansion valve by n4. At this time, increasing the opening of the electronic expans...

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Abstract

The invention is applicable to an air conditioner control technology and provides a system for controlling an electronic expansion valve of an air conditioner. The system comprises a system starting unit, a superheat degree acquisition unit, and a judgment and regulation unit, wherein the system starting unit is used for opening the electronic expansion valve based on initial openness according to the environment temperature; the superheat degree acquisition unit is used for acquiring the exhaust temperature superheat degree of a compressor regularly; the judgment and regulation unit is used for judging whether the exhaust temperature superheat degree is within a preset reasonable temperature range and regulating the initial openness based on preset regulation amplitude when the exhaust temperature superheat degree is not within the preset reasonable temperature range, thus to enable the exhaust temperature superheat degree of the compressor to be within the preset reasonable temperature range. The system for controlling the electronic expansion valve of the air conditioner has the advantages that the openness of the electronic expansion valve is adjusted according to the exhaust temperature superheat degree of the compressor; due to larger permissible error range of the exhaust temperature superheat degree, the openness of the compressor cannot deviate from the optimum openness even if errors are smaller, so that a multi-split air conditioner system can be keep well operating under an optimum state.

Description

technical field [0001] The invention belongs to the technical field of air-conditioning control, and in particular relates to an air-conditioning electronic expansion valve control system, a control method and a multi-connected air-conditioning outdoor unit using the electronic expansion valve. Background technique [0002] At present, the electronic expansion valve has been widely used as the throttling part of the multi-connected external unit because of its precise control of the refrigerant flow and the appropriate cost. Therefore, a suitable electronic expansion valve control method appears in the multi-connected system. Particularly important. However, under some actual operating conditions and combinations of the unit, an inappropriate opening of the electronic expansion valve will cause the discharge temperature of the compressor to be low, resulting in liquid-filled compression of the compressor, and its long-term operation will affect the compressor’s performance. ...

Claims

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Application Information

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IPC IPC(8): F25B49/02F25B41/06F24F1/06F24F11/00F25B41/34
CPCY02B30/70
Inventor 马进许永锋梁伯启李洪生张刘刚卢健洪
Owner MIDEA GRP CO LTD
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