Condensing pressure control device of air conditioning unit and control method thereof

Abstract

The invention discloses a condensing pressure control device of an air conditioning unit and a control method thereof. The device comprises a ball valve arranged on a coolant pipeline of a heat exchanger, an adjustment mechanism used for adjusting the opening of the ball valve and a control mechanism used for controlling the actions of the adjustment mechanism, wherein the control mechanism comprises a source information acquisition module, an information storage module, a comparison module and a master control module. The condensing pressure control method for the air conditioning unit comprises that: acquired source information on the coolant pipeline of the heat exchanger is transmitted to the comparison module; the comparison module compares the received source information with pre-stored set information and transmits obtained comparison information to the master control module; and according to the comparison information, the master control module controls the adjustment mechanism to adjust the opening of the ball valve on the coolant pipeline of the heat exchanger. The condensing pressure control device of the air conditioning unit and the control method thereof provided by the invention are reliable in control, high in accuracy and system flexibility and capable of performing real-time monitoring, protecting the valve and being adapted to different compressors and different refrigerants.

Description

technical field [0001] The invention relates to an auxiliary device of an air-conditioning unit, in particular to an air-conditioning unit condensation pressure control device and a control method thereof. Background technique [0002] In the water-cooled air-conditioning system, cooling water is input into the water-cooled heat exchanger through a water pump to cool the high-temperature refrigerant gas discharged from the compressor. The computer room air conditioner has the characteristics of running around the clock. If the condensing pressure is too high or too low, it will affect the stability of the entire refrigeration system, and even lead to system overload protection and affect the service life of the compressor. Therefore, it is necessary to control the condensing pressure of the system within a reasonable range. [0003] The adjustment of the condensing pressure is usually carried out from the water side. The most common way to adjust the condensing pressure fr...

AI Technical Summary

Problems solved by technology

This kind of mechanical valve has many disadvantages: 1) The structure of the valve body is complex, the volume is large, and the space requirement is high, so it is difficult to apply it in a unit with a small volume; 2) The cost is high due to the complex structure; The pressure difference of the spring force is used to control the valve opening, which belongs to mechanical control, and the control accuracy is poor; 4) The condensing pressure control balance point is adjusted by rotating the adjusting screw, and the system flexibility is low; 5) Real-time monitoring is not possible, and the accuracy is low Low; 6) Sensitive valve adjustment will inevitably lead to frequent adjustment, especially in the use of digital scroll compressors, the condensing pressure changes greatly and the cycle is short, so it will inevitably lead to shortened service life of the valve

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