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Method and device for controlling expansion valve of enhanced vapor injection system and storage medium

A technology of air injection to increase enthalpy and expansion valve, which is applied in refrigeration and liquefaction, refrigerators, refrigeration components, etc., and can solve problems such as current frequency limitation, current protection shutdown, system fluctuations, etc.

Active Publication Date: 2017-12-22
GD MIDEA HEATING & VENTILATING EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the opening of the auxiliary electronic expansion valve is increased, the suction capacity of the compressor will increase, and the current will also increase accordingly, which may cause current protection shutdown or current frequency limit, thereby causing system fluctuations and affecting system stability.
In addition, in the existing gas injection enthalpy increasing system, it is difficult to control the superheat of the compressor injection port within a reasonable range

Method used

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  • Method and device for controlling expansion valve of enhanced vapor injection system and storage medium
  • Method and device for controlling expansion valve of enhanced vapor injection system and storage medium
  • Method and device for controlling expansion valve of enhanced vapor injection system and storage medium

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Experimental program
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Effect test

Embodiment 1

[0039] figure 2 It is a flowchart of a method for controlling an expansion valve of an air-conditioning air injection enthalpy increasing system provided by an embodiment of the present invention. Such as figure 2 As shown, the embodiment of the present invention provides a method for controlling the expansion valve of the air-conditioning air injection enthalpy system, which can be used for example figure 1 The electronic expansion valve of the air injection enthalpy increasing system is adjusted, and the method includes the following steps:

[0040]Step S201, detecting the change of the superheat degree of the injection port of the compressor. In this application, the degree of superheat is represented by SH, and the degree of superheat can be passed figure 1 The temperature sensors T6A and T6B are shown for detection, and the degree of superheat SH is the difference between the temperature sensor T6B and the temperature sensor T6A, that is, SH=T6B-T6A.

[0041] Step S...

Embodiment 2

[0050] Figure 4 It is a flowchart of a method for controlling an expansion valve of an air-conditioning air injection enthalpy increasing system provided by another embodiment of the present invention. Such as Figure 4 As shown, the preset opening value may include multiple preset opening values, and the preset current value may include multiple preset current values. In this embodiment, two preset opening values ​​are taken as an example to illustrate the method steps in which there are multiple preset opening values. In this embodiment, the preset opening value includes a first preset opening value and a second preset opening value, and the preset current value includes a first preset current value and a second preset current value . Wherein, the second preset opening value is greater than the first preset opening value, and the first preset current value and the second preset current value correspond to the first preset opening value and the second preset opening value...

Embodiment 3

[0066] Figure 6 It is a flowchart of a method for controlling an expansion valve of an air-conditioning air injection enthalpy increasing system provided by a preferred embodiment of the present invention. Such as Figure 6 As shown, the difference between this embodiment and the preceding embodiments is that before detecting the change of the superheat, the outdoor ambient temperature is detected first, and it is determined whether to open the auxiliary expansion valve according to the outdoor temperature. Wherein, the steps of detecting the outdoor ambient temperature are as follows:

[0067] Step S601, detecting the outdoor ambient temperature.

[0068] Step S602, if the outdoor ambient temperature is greater than a preset temperature, close the auxiliary circuit electronic expansion valve.

[0069] Step S603, if the outdoor ambient temperature is less than or equal to the preset temperature, after the compressor runs for a preset time, open the auxiliary circuit electr...

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Abstract

The invention provides a method and device for controlling an expansion valve of an enhanced vapor injection system and a storage medium, and belongs to the field of electrical equipment. The method comprises the following steps that superheat degree changes of a jet opening of a compressor are detected; when the superheat degree is not in the preset range, the preset opening value of the auxiliary electronic expansion valve is increased or decreased; when the preset opening value of the auxiliary electronic expansion valve is increased, electric current of an air conditioning outdoor unit is detected; when the electric current is less than the preset electric current value, the preset opening value of the auxiliary expansion valve is increased again; when the electric current is greater than the preset electric current value, the frequency of the electric current is reduced until the electric current is less than the preset electric current value, and the preset opening value of the auxiliary expansion valve is increased again; and the above operation is repeated until the superheat degree is in the preset range. According to the above technical scheme, the superheat degree of the jet opening of the compressor can be made to be in the preset range, and excessive current of the outdoor unit is avoided.

Description

technical field [0001] The invention relates to the field of electrical appliances, in particular to a method, device and storage medium for controlling an expansion valve of an air-conditioning air injection enthalpy increasing system. Background technique [0002] Air injection enthalpy increasing technology is often used to improve the low-temperature heating effect. The principle is to increase the circulation volume of the system by opening the air supply port in the middle, thereby improving the low-temperature heating effect. At present, the combination of plate heat exchanger and auxiliary electronic expansion valve is often used to realize air supplementation. However, when the opening of the auxiliary electronic expansion valve is increased, the suction capacity of the compressor will increase, and the current will also increase accordingly, which may cause current protection shutdown or current frequency limit, thereby causing system fluctuations and affecting sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B41/06F25B49/02F25B41/34
CPCF25B49/02F25B41/31Y02B30/70
Inventor 李健锋邓建云李荣江
Owner GD MIDEA HEATING & VENTILATING EQUIP CO LTD
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