Cold water air conditioner system

Abstract

The invention discloses a cold water air conditioner system comprising a plate-type evaporator, a compressor and a condenser. The plate-type evaporator, the compressor and the condenser are connected through a pipeline. A temperature sensor and a pressure sensor are mounted on an air suction pipeline of the compressor. A bypass pipeline is connected on an outlet pipeline of the compressor. The other end of the bypass pipeline communicates with an inlet pipeline of the plate-type evaporator. An electromagnetic valve is mounted on the bypass pipeline. When the actual superheat degree is smaller than the standard superheat degree and the air suction pressure is smaller than the standard air suction pressure, the electromagnetic valve is opened. When the actual superheat degree is larger than or equal to the standard superheat degree or the air suction pressure is larger than or equal to the standard air suction pressure, the electromagnetic valve is opened. A pressure balancing valve is not adopted to preventing ice blockage any more but a common electromagnetic valve is adopted to achieve the ice blockage preventing effect, so that the ice blockage preventing cost is reduced greatly. Compared with the pressure balancing valve, the electromagnetic valve is higher in precision, smaller in weight and more precise in controlling, it is guaranteed that the interior of the evaporator is free from icing, and the ice blockage phenomenon of the plate-type evaporator is removed thoroughly.

Description

technical field [0001] The invention relates to a cold water air conditioning system, in particular to an air conditioning system capable of preventing ice blockage of a plate evaporator. Background technique [0002] In recent years, in the field of cold water air conditioning, the application of plate evaporators has gradually decreased. The main reason is that some cold water channels are prone to ice blockage in the low evaporation temperature conditions of plate evaporators, resulting in freezing damage of plate evaporators and high maintenance costs. Brand image has a big impact. However, the plate evaporator has the advantages of small size and high heat exchange efficiency, which has prompted the air conditioning industry to adopt many methods to solve this problem. The most commonly used method is to add a low-pressure pressure balance valve. Its control schematic diagram is as follows figure 1 As shown, the outlet pipeline 8 of the compressor is connected to a by...

AI Technical Summary

Problems solved by technology

[0003] 1. The pressure balance valve is a mechanical regulating valve, which requires high processing precision and material selection, and is relatively difficult in technology. At present, only a few foreign-funded enterprises such as Danfoss have fully mastered this technology, so they adopt monopoly prices. Meager today, it is difficult for this technology to be used on a large scale;

[0004] 2. The adjustment technology of the pressure balance valve is relatively mature, but the mechanical adjustment accuracy is not high, especially the closing pressure fluctuation range is large

From the point of view of the refrigeration principle, adding high-pressure and high-temperature gas to the throttled liquid refrigerant seriously affects the heat transfer efficiency of the plate evaporator, and also affects the isentropic compression efficiency of the compressor, resulting in low capacity and efficiency of the air conditioning system;

[0005] 3. The pressure balance valve itself is large in size and heavy in weight, and requires three pipelines for high-pressure gas in / out and pressure balance. The pipelines take up a lot of space, and at the same time, there are many pipelines and large vibrations, and there is a risk of leakage

Although the invention patent no longer uses the pressure balance valve to prevent ice blockage and reduces the cost, but in the actual use process, when the temperature in the evaporator is not lower than the set temperature, ice will appear in the evaporator. It is not accurate to judge whether to activate the anti-icing device by detecting the temperature in the evaporator, and it cannot play an effective role in preventing ice-blocking

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