An unloading adjustment control method for a large-displacement frequency conversion multi-connection system

A multi-connection system, regulation control technology, applied in the control input involving air characteristics, heating and ventilation control systems, heating and ventilation safety systems, etc. and other problems, to achieve the effect of increasing the pressure on the low pressure side, reducing the pressure on the high pressure side, and avoiding frequent start and stop.

CN110319541BActive Publication Date: 2020-11-20GUANGDONG CHIGO HEATING & VENTILATION EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-11-20

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Abstract

The invention discloses an unloading adjustment control method of a large-displacement variable-frequency multi-split air conditioner system. The multi-split air conditioner system involves an outdoorunit and a plurality of indoor units, wherein each indoor unit comprises an indoor heat exchanger and an electronic expansion valve, the outdoor unit comprises an outdoor heat exchanger, a compressorand an unloading electromagnetic valve, and the unloading electromagnetic valve is used for enabling an air outlet side of the compressor to communicate with an air return side of the compressor. Thecontrol method comprises the steps that the multi-split air conditioner system enters a working mode, the starting-stopping states of all the indoor heat exchangers are detected and judged; if the working mode is the refrigerating mode, outlet temperature parameters of the indoor heat exchangers in the starting states are obtained, an outlet temperature average value is calculated, and the opening degree of the unloading electromagnetic valve is determined according to the outlet temperature average value; and if the working mode is the heating mode, the middle temperature parameters of the indoor heat exchangers in the starting states are obtained, a middle temperature average value is calculated, and the opening degree of the unloading electromagnetic valve is determined according to the middle temperature average value.
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Description

technical field

[0001] The invention relates to the technical field of multi-connected air conditioners, in particular to an unloading adjustment control method of a large-displacement variable-frequency multi-connected system. Background technique

[0002] In the current multi-connected system, the model of the indoor unit is small, and the required cooling capacity is small, and even if the inverter compressor with large displacement operates at the lowest operating frequency, its output capacity is far greater than the demand of the indoor unit (for example, 20 HP The frequency conversion compressor runs at a minimum of 10Hz, and its compressor capacity exceeds 3000W), resulting in a contradiction between large compressor capacity and small demand for indoor unit capacity, that is, the phenomenon of "big horses and small carts". When the output is large, but the evaporator of the indoor unit is small and the caliber of the matching electronic expansion valve is also small...

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with specific embodiment:

[0022] Refer to attached figure 1 to attach image 3 As shown, this embodiment is a large-displacement frequency conversion multi-connection system, including an outdoor unit and multiple indoor units, each indoor unit includes an indoor heat exchanger 4 and an electronic expansion valve 6, and the outdoor unit includes an outdoor heat exchanger 2 , compressor 1 (compressor 1 is an inverter compressor), unloading solenoid valve 3, and a four-way valve, wherein an unloading branch is arranged between the outlet side and the return side of compressor 1, and unloading solenoid valve 3 is arranged in series On the unloading branch, by opening the unloading solenoid valve 3, the unloading branch can be connected to the air outlet side and the return air side of the compressor 1; it also includes a controller and a plurality of sensors, wherein the plurality of sensors include T...