Fixed pressure by-pass valve device for air quantity control system

Abstract

The invention relates to a constant pressure by-pass valve device for wind control. A wind inlet cavity and a wind outlet cavity are arranged in the device, a valve core is glidingly disposed in the device which is equipped with a valve seat, and the wind inlet cavity and the wind outlet cavity are respectively positioned on bilateral sides of the valve seat. When closed, the valve core seals the valve seat, and when opened, the valve core disengages from the valve seat, and the wind inlet cavity and the wind outlet cavity are communicated. Additionally a regulating mechanism is disposed in the device, which is used for adjusting the compressing force that the valve core pushes against the valve seat, when pressure in pipe is larger than the pre-compression force that the valve core pushes against the valve seat, the valve core disengages from the valve seat, and the device can automatically discharge excess wind by-passing in the system from a return air pipe or an air discharging pipe. The constant pressure by-pass valve device can stabilize constant pressure by-pass valve device, avoid generation and enlargement of 'breathe type' pressure oscillation, simultaneously the device provides a stable back pressure for a constant air volume valve and a variable air volume valve at the end, and increases the actual usage accuracy.

Description

technical field [0001] The invention relates to a constant pressure valve device, in particular to a constant pressure bypass valve device used in an air volume control system. Background technique [0002] In the prior art, the adjustment of air volume and air pressure in ventilation and air conditioning systems is basically accomplished by multi-leaf regulating valves. For occasions with high precision requirements, such as P3 laboratories, animal laboratories with SPF level and above, airflow analysis laboratories and other places, high-precision constant air volume valves or variable air volume valves will be considered. Such as using TROX products or Phoenix products. Even so, under ideal conditions, the highest deviation of the air volume accuracy can only reach about 5%. If it exceeds a certain range of requirements, such as when the air pressure in the pipeline deviates from the back pressure of the constant air volume valve or variable air ...

AI Technical Summary

Problems solved by technology

If it exceeds a certain range of requirements, such as when the air pressure in the pipeline deviates from the back pressure of the constant air volume valve or variable air volume valve, the air volume accuracy will be reduced to 15% to 20%.

In addition, the frequency conversion control of the fan air volume is a typical follow-up control, which may cause serious and inevitable time lag effects, resulting in adverse results such as pressure oscillations in the system, which will reduce the air volume and air pressure accuracy of the ventilation and air conditioning system

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