Invariable frequency one-drive-two air conditioning unit

Abstract

The invention discloses an invariable frequency one-drive-two air conditioning unit. Two invariable frequency compressors and a fan (10) are arranged in an outdoor unit; a live wire end (8) of the first invariable frequency compressor (7) is connected with a zero line end (9) of the first invariable frequency compressor through a second normal close contact (5) and a first coil (1); the second normal close contact (5) is connected with the fan (10) through a first normal open contact (3); the fan (10) is connected with the zero line end (9) of the first invariable frequency compressor (7) through the other first normal open contact (3); a live wire end (8) of the second invariable frequency compressor (11) is connected with a zero line end (9) of the second invariable frequency compressor through a first normal close contact (2) and a second coil (4); the first normal close contact (2) is connected with the fan (10) through a second normal open contact (6); and the fan (10) is connected with the zero line end (9) of the second invariable frequency compressor (11) through the other second normal open contact (6). According to the invariable frequency one-drive-two air conditioning unit, the two compressors can be interlocked.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a fixed-frequency one-to-two air-conditioning unit. Background technique [0002] A common fixed frequency air conditioner is an external unit and an internal unit, and the external unit is provided with a compressor and a fan. In this way, if you want to drive two internal units, you generally need two external units. However, the current domestic air-conditioning industry is increasingly fierce in price competition, and the cost control has even reached the level of penny-pinching. Therefore, in order to control the cost, some people naturally put forward the idea of ​​using one external machine to drive two internal machines. The external machine is equipped with two fixed-frequency compressors, a heat exchanger and a fan. The two compressors are controlled by The two internal units are powered separately, and the two compressors share the heat exchanger and fan, so as to red...

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Problems solved by technology

[0003] However, there is a key technical problem in the above assumption, that is, how to realize the control and interlocking of the circuits of the two compressors of the external unit, because when the traditional control method turns on any one of the internal units and supplies power to the corresponding compressor, the compressor Both the compressor and the fan can operate normally, but if the two internal units are turned on at the same time, when the power is supplied to the two compressors, the zero live wire of the fan will be short-circuited and the machine will be shut down

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