Method and device for controlling electronic expansion valve of external unit heat exchanger

A technology of electronic expansion valve and control method, which is applied in the direction of control input related to system state, space heating and ventilation control input, heating mode, etc., which can solve the complexity of system flow path, increase system operating power, and increase design and manufacturing costs and other problems to achieve the effect of avoiding compressor liquid return, improving reliability and increasing discharge speed

Inactive Publication Date: 2019-05-24
GD MIDEA HEATING & VENTILATING EQUIP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the problem with related technologies is that adding additional heating will increase the operating power of the system on the one hand, which is not conducive to meeting the needs of energy saving; on the other hand, it will complicate the flow path of the system and increase the cost of design and manufacturing

Method used

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  • Method and device for controlling electronic expansion valve of external unit heat exchanger
  • Method and device for controlling electronic expansion valve of external unit heat exchanger
  • Method and device for controlling electronic expansion valve of external unit heat exchanger

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Embodiment Construction

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0032] The method and device for controlling the electronic expansion valve of the external unit heat exchanger according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0033] figure 1 It is a schematic flowchart of a method for controlling an electronic expansion valve of an external heat exchanger according to an embodiment of the present invention.

[0034] Such as figure 1 As shown, the control method of the electronic expansion valve of the external unit h...

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Abstract

The invention provides a method and device for controlling an electronic expansion valve of an external unit heat exchanger. The method comprises the steps that the discharge temperature of a compressor, the discharge pressure of the compressor, the air return pressure of the compressor and the pressure ratio of the compressor are obtained; and the opening degree of the electronic expansion valveof the external unit heat exchanger is controlled according to the discharge temperature of a compressor, the discharge pressure of the compressor, the air return pressure of the compressor and the pressure ratio of the compressor. During a defrosting stage, the discharge speed of a refrigerant in a low pressure tank is accelerated, the liquid return of the compressor is avoided, and the reliability of an air conditioning system is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method for controlling an electronic expansion valve of an external heat exchanger and a control device for the electronic expansion valve of an external heat exchanger. Background technique [0002] After the frost has accumulated to a certain extent, the multi-connected system will enter the defrosting mode, the four-way valve of the system is switched, the operating mode is switched from heating mode to cooling mode, the external heat exchanger becomes a condenser, and the refrigerant is in a high-pressure state. Turn frost on the heat exchanger into condensate and drain. At this time, the outside temperature is low, the convection heat transfer between the refrigerant and the environment is strong, and the condensation is large, while the inside fan stops running, the electronic expansion valve of the internal unit has a large opening, and the evaporation capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/30F24F11/62F24F11/84F24F11/64F24F140/10
Inventor 梁鑫杨国忠王命仁谭志军
Owner GD MIDEA HEATING & VENTILATING EQUIP CO LTD
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