Intelligent throttle valve and refrigerating circuit system thereof

Abstract

The invention discloses an intelligent throttle valve and a refrigerating circuit system thereof. The intelligent throttle valve comprises a throttle valve body, an intelligent regulation controller and a drive mechanism which are mutually connected, wherein the intelligent regulation controller collects liquid pressures at inlet and outlet ends of a valve of the throttle valve body; and when the liquid pressure drop at the inlet and outlet ends of the valve is in a preset range, the intelligent regulation controller controls the drive mechanism to drive the throttle valve body to act so as to regulate the liquid flow passing through the throttle valve body. Meanwhile a flow control model is induced for controlling the liquid flow so that the control of the throttle valve is flexible, the adaptability is strong and the accuracy is high. By using the refrigerating circuit system of the intelligent throttle valve, multiple compressors share one fluorine system, the intelligent throttle valve has faster response speed and minimum stable degree of superheat control logic, the flow control accuracy of 0.01% can be reached, types can meet the various air-conditioning cold-capacity ranges, and energy efficiency of a cold water unit can be greatly improved.

Description

technical field [0001] The invention relates to the field of throttling of refrigeration systems, in particular to an intelligent throttling valve and its refrigeration circuit system. Background technique [0002] The refrigeration and air-conditioning industry has a history of more than 100 years, and expansion valves have a history of more than 70 years. The first generation of expansion valves was a fixed orifice without any adjustment capability, followed by manual expansion valves. Due to its ability to regulate, thermal expansion valves are widely used as throttling devices in refrigeration systems and have lasted for more than half a century. In order to further improve the regulating ability of expansion valves and achieve high energy efficiency, electronic expansion valves have been developed. Another major reason why electronic expansion valves are so widely used is the current call for energy savings. The problem of energy saving has become a worldwide problem...

AI Technical Summary

Problems solved by technology

[0004] B. Partial load performance cannot give full play to its advantages

Since the two loop systems are completely independent, when one compressor stops, half of the idle evaporation and condensation area cannot be used by the other compressor, limiting the potential for performance improvement at part load

[0005]C. Unit maintenance is inconvenient

This inconvenience is particularly manifested in: 1) when cleaning the copper pipe, the cleaning brush may not pass through the entire length of the container because the copper pipe may not be completely aligned, which will increase the workload of opening the water chamber at the other end for cleaning

2) Although there have been no accidents of copper tube freezing and abrasion in the dual-head unit, in case of such a problem, the unit needs to be completely disassembled during the plugging and tube replacement operation, which will greatly prolong the maintenance time , increase the maintenance workload;

[0006] D. The number of compressors used on the unit is limited. In order to avoid too much water pressure drop in the heat exchanger tube, the refrigerant multi-circuit unit generally uses at most two compressors

[0007] If the electronic expansion valve is used as the throttling mechanism, there is no way to use a single throttling mechanism when the water-cooled chiller is larger than 400 tons, that is, multiple compressors share one fluorine system , it is necessary to use multiple throttling mechanisms, that is, multiple compressors using multiple fluorine systems, so that not only the cost of the chiller will be greatly increased, but also the control program will be very complicated. Now only a few European and American manufacturers can produce electronic expansion valves , domestic manufacturers have no such research and development results

Among them, the Japanese patent (JP 2001-324246A) discloses an expansion valve, which can intelligently adjust the refrigerant flow through the valve, but it does not propose how to achieve flexible flow control and strong adaptability and accuracy.

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