Multi-connected system and its control method for heating throttling element
A multi-connected system, heating and throttling technology, applied in the field of multi-connected systems, can solve the problems of liquid return from the compressor, long distance between the outdoor unit and the distribution device, and affect the reliability of the system, so as to achieve short defrosting time and improve reliability sexual effect
Active Publication Date: 2019-01-18
GD MIDEA HEATING & VENTILATING EQUIP CO LTD +1
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Problems solved by technology
But for the multi-connected system, because the distance between the outdoor unit and the distribution device is usually very far, when the common defrosting control method is adopted, it is easy to cause a large amount of liquid return to the compressor, which seriously affects the reliability of the system
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[0022] 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.
[0023] The method for controlling the heating throttling element in the multi-connected system and the multi-connected system according to the embodiments of the present invention are described below with reference to the accompanying drawings.
[0024] figure 1 It is a flowchart of a method for controlling a heating throttling element in a multi-split system according to an embodiment of the present invention. Among them, the multi-connected system includes an outdoor unit, multiple indoor units and a flow distribution device. ...
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The invention discloses a multi-connection system and a method for controlling heating and throttling elements thereof. The method includes the following steps: when the multi-connection system enters a defrosting mode, the outdoor unit sends a defrosting signal to a flow distribution device; When the defrosting signal is received, the heating throttling element is controlled by a segmented control strategy; in the process of segmental control of the heating throttling element, the return air superheat of the compressor is obtained in real time, and according to the return air Superheat adjusts the opening of the heating throttle element. In this method, when the multi-connected system enters the defrosting mode, the heating and throttling element is controlled in sections, and the heating and throttling element is flexibly adjusted according to the superheat of the return air to avoid compression of the multi-connected system during defrosting. A large amount of liquid returns to the machine, which improves the reliability of the system and has little impact on the defrosting time of the system.
Description
technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method for controlling a heating throttling element in a multi-connection system and a multi-connection system. Background technique [0002] Usually, when the air conditioning system is heating, the system sends heat from the outdoors to the indoors, and the outdoor heat exchanger acts as an evaporator. When the outdoor ambient temperature is close to or below freezing point, the water vapor in the air will condense on the surface of the evaporator and frost. Because the frosting of the evaporator increases the heat transfer resistance between the surface of the evaporator and the air, thus increasing the flow resistance of the air flow through the evaporator, reducing the air flow through the evaporator, and the heat exchange efficiency is significantly reduced, resulting in outdoor The heat exchange between the environment and the refrigerant decreases, and the wor...
Claims
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IPC IPC(8): F25B13/00F25B41/06F25B47/02F25B49/02F25B41/31
CPCF25B13/00F25B47/02F25B49/02F25B2500/28F25B2313/023F25B2313/02741F25B2347/023F25B41/30
Inventor 杨坤
Owner GD MIDEA HEATING & VENTILATING EQUIP CO LTD