Outdoor unit set of air conditioning variable refrigerant volume system and pressure detection method

Abstract

The invention discloses an outdoor unit set of an air conditioning variable refrigerant volume system. The outdoor unit set comprises outdoor units, and each outdoor unit comprises a compressor, an outdoor unit heat exchanger, an electronic expansion valve, a refrigeration one-way valve and a four-way valve; two ends of the refrigeration one-way valve are communicated with two ends of the electronic expansion valve respectively; the other end of the outdoor unit heat exchanger is communicated with the other end of an indoor unit via the electronic expansion valve; the outdoor unit set of the air conditioning variable refrigerant volume system is characterized in that a high pressure sensor is arranged on a connection pipeline between the output end of the compressor and the four-way valve in any one outdoor unit; a low pressure sensor is arranged on a connection pipeline between the input end of the compressor and the four-way valve; and a secondary pressure sensor is arranged on a connection pipeline between the four-way valve and the outdoor unit heat exchanger of each of the rest of the outdoor units. According to the outdoor unit set of the air conditioning variable refrigerant volume system, the number of the pressure sensors is reduced, so that the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a multi-connected external unit of an air conditioner and a pressure detection method. Background technique [0002] Multi-split air conditioner, also known as multi-split air-conditioning system (referred to as VRV), is widely used in offices, production workshops and other occasions due to its excellent part-load characteristics and significant energy-saving effects. [0003] For multi-connected units, in order to accurately control the indoor temperature to meet the comfort of the user experience, it needs to control the high pressure and low pressure of the air conditioning system, that is to say, low pressure control is performed during cooling, and high pressure control is performed during heating. Each external unit of the existing multi-connected unit has a high-pressure pressure sensor and a low-pressure pressure sensor respectively. The high-pressure pressure s...

AI Technical Summary

Problems solved by technology

Taking the multi-connection of 4 external units as an example, the pressure sensors designed are 2*4=8, including four high-pressure pressure sensors and four low-pressure pressure sensors. In actual use, only 5 sensors are used, and additional The 3 pressure sensors are wasted idle

[0005] Although the installation of several pressure sensors on a single multi-connector is relatively small in terms of cost, no matter it is a residence, an office building, a constant temperature workshop, a shopping mall, or a scientific research institution, it is inseparable from the use of the air conditioning system, so how to solve the problem? The problem of idle waste of some pressure sensors in the multi-line is actually an important technical problem to be solved in response to the national energy saving, emission reduction and cost reduction

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