Refrigerant circulation control device and method for multi-connected air conditioner

Abstract

The invention relates to a control device of cool medium recycling quality for multi-connected air conditioner and the control method. The device comprises adjusting device for cool medium quality, electromagnetic valve, electronic expansion valve, suction temperature sensor and pressure sensor of low pressure. The adjusting device is connected to the position between condensator and electronic expansion device by main pipe and in the cavity branching pipe is set on. On the branching pipe electromagnetic valve is set in series. One branching pipe is connected with the drainage pipe of compressor and the other is connected with suction pipe. The suction pipe of compressor is connected with the pressure sensor of low pressure and suction temperature sensor. When the system runs normally, the electronic expansion valve is adjusted to control the quality of cool medium. When the opening degree of electronic expansion valve is over the range, the electromagnetic valve is adjusted to control the quality of cool medium again. In this way residual cool medium in the device is recycled to the system so as to take part in running newly and the cycling quality of cool medium is controlled in time under any condition.

Description

technical field [0001] The invention relates to an air conditioner, in particular to a refrigerant circulation volume control device and a control method for a multi-connected air conditioner. Background technique [0002] A multi-connected air conditioner unit is a kind of air conditioner unit in which multiple outdoor units are connected in parallel and multiple indoor units are connected in parallel. Especially in the heating operation, because most of the liquid refrigerant is in the evaporator of the indoor unit, the number of indoor units that are turned on is different, and the amount of refrigerant circulation required for unit operation is also different. When the number of indoor units turned on is large, the amount of refrigerant required for circulation is large; when the number of indoor units turned on is small, the amount of refrigerant required for circulation is small. In addition, more liquid refrigerant will accumulate in the indoor unit that has not been...

AI Technical Summary

Problems solved by technology

It is impossible to adjust the refrigerant in the device to the system to participate in the cycle in time when the system lacks the amount of refrigerant circulation according to the operation needs of the system. It cannot ensure that the unit is always running in the best state, and there is no adjustment effect

[0005] Second, by adjusting the opening degree of the thermal expansion valve and the electronic expansion valve to control the circulation amount in the system, such as comparative documents CN2685779 and CN1563861, although it can adjust the refrigerant circulation amount, it can only be adjusted when the thermal expansion valve and the electronic expansion valve are opened. work within the range of

If the opening adjustment range of the thermal expansion valve and electronic expansion valve is exceeded, and the refrigerant circulation volume is still inappropriate, these two devices will fail

[0006] Third, the regular refrigerant recovery operation means that when there are internal units that are not operating in the entire system, the refrigerant accumulated in these internal units is periodically recovered into the system cycle to participate in the operation again, but the refrigerant recovery operation can only periodically solve the system cycle The problem of lack of refrigerant in the medium is of no benefit to the situation of excessive refrigerant in the system, and it cannot guarantee that the proper amount of refrigerant circulation is maintained at every moment during the operation of the system

Images