Defrosting method of multi-combination type air conditioning unit

A multi-connected air conditioner and unit technology, applied in refrigerators, heating methods, refrigeration components, etc., can solve the problems of unreasonable use of heat, reduce coil temperature, reduce defrosting effect, etc., to avoid high temperature and high pressure faults and shutdowns The effect of shortening the time and improving the defrosting effect

CN103123194AInactive Publication Date: 2013-05-29NINGBO AUX ELECTRIC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2013-05-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a defrosting method of a multi-combination type air conditioning unit. The defrosting method comprises that starting operation is carried out, temperature T0 of a frosted side of a coil pipe of an outdoor heat exchanger (1) of each outdoor machine is measured, when T0 of a certain outdoor machine is judged to be lower than -12 degrees, an air conditioning main controller sends a defrosting command to start to defrost the outer machine, reversing direction is carried out on a four-way reversing valve (2) and rotation of an outdoor fan is stopped at the same time, the outer fan is operated in an inverted mode, when a defrosting temperature sensor of the outdoor machine for carrying out defrosting detects temperature of a defrosting side of the coil pipe of the outdoor heat exchanger (1) of the outdoor machine to be larger than or equal to 12 degrees, defrosting is finished, after frequency of an inverter compressor (3) of the outdoor machine is reduced to reversing frequency, the frequency is kept being operated for 10 seconds, then the four-way reversing valve (2) is reversed in direction, and the whole air conditioning unit is switched back to be operated in a heating mode. The defrosting method is short in defrosting time, high in defrosting efficiency and rapid in defrosting speed.
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Description

technical field

[0001] The invention relates to a multi-connected air-conditioning unit, in particular to a defrosting method for a multi-connected air-conditioning unit. Background technique

[0002] The multi-connected air conditioner unit in the prior art includes one or more outdoor units, a plurality of indoor units connected in parallel, and two refrigerant circulation main pipes connecting each indoor unit and each outdoor unit. If there is one outdoor unit, the outdoor unit is connected to multiple indoor units connected in parallel through two refrigerant circulation main pipes; if there are multiple outdoor units, multiple outdoor units are connected in parallel, and the parallel outdoor units pass through two refrigerant circulation main pipes Connect with the indoor units connected in parallel.

[0003] Each outdoor unit includes compressor, oil separator, four-way reversing valve, outdoor heat exchanger (evaporator in heating mode), throttling device, liquid re...

Examples

Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Such as figure 1 As shown, an embodiment of the defrosting method of the multi-connected air conditioner unit of the present invention, in this embodiment, each outdoor unit includes a fixed-frequency compressor 4 and a variable-frequency compressor 3, and the two compressors are connected in parallel. It includes the following steps:

[0026] a. Turn on the compressor of the outdoor unit in heating mode.

[0027] b. Measure the temperature T on the frosting side of the coil of the outdoor heat exchanger 1 of each outdoor unit through the defrosting temperature sensor on the frosting side of the coil of the outdoor heat exchanger 1 of each outdoor unit 0 , and send the temperature measurement result to the main controller of the air conditioner. When the main controller judges the T of an outdoor unit 0 When the temperature is lower t...