Direct-acting type pressure regulator for compensating for spring effect

Abstract

The invention relates to a direct-acting type pressure regulator for compensating for a spring effect. The direct-acting type pressure regulator comprises a main valve body and a drive assembly, the main valve body is installed at the lower end of the drive assembly, a valve seat, a valve disc, a valve rod, a valve rod sleeve and a balance diaphragm are assembled inside the main valve body, the drive assembly comprises an upper diaphragm shell, a lower diaphragm shell, a diaphragm and a tray, the outer peripheral wall of the tray and the inner peripheral wall of the lower half part of the upper diaphragm shell form an annular installation cavity with a V-shaped cross section, the diaphragm upwards forms an annular protrusion with the omega-shaped cross section in the annular installation cavity upward, the lower diaphragm shell is connected with a signal pipe, and the signal pipe is used for communicating with a pipe connected to an outlet end of the main valve body. According to the direct-acting type pressure regulator, a traditional direct-acting type pressure regulator is transformed, and when the diaphragm and the tray move from bottom to top after being stressed, an effectivearea of the diaphragm is gradually increased; and when the diaphragm and the tray move from top to bottom after being stressed, the effective area of the diaphragm is gradually reduced, the spring effect of the pressure regulator is effectively compensated, and the pressure regulator can achieve high voltage stabilization accuracy.

Description

technical field [0001] The invention relates to the field of gas pressure regulating devices, in particular to a direct acting pressure regulator for compensating spring effects. Background technique [0002] A pressure regulator is a special valve on a pipeline that automatically adjusts the outlet pressure to stabilize it within a certain pressure range. Pressure regulators are divided into direct-acting regulators and indirect-acting regulators. The working principle of the direct-acting regulator is to use the outlet pressure change of the regulator to directly control the drive assembly to drive the movement of the regulating element. The main component of the drive assembly is the diaphragm. There is a pressure regulating spring inside the pressure regulator. When working, the pressure regulating spring will change the compression amount with the opening of the valve disc. Therefore, the spring force varies with the opening of the valve disc. Change, this change affec...

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Problems solved by technology

[0003] A high-quality pressure regulator needs to reduce the spring effect as much as possible. There are roughly the following methods to reduce the spring effect in the existing technology: 1. Reduce the spring stiffness of the pressure regulating spring. This method can properly reduce the spring effect , but the adjustment range of the spring will be reduced; 2. The main diaphragm adopts rolling diaphragm technology, but the effect is not great; 3. The method of built-in signal tube is also called the method of taking negative pressure. The port of the signal tube must be placed in the adjustment In the pressure field in the outlet cavity of the compressor, where the pressure is lower, this pressure must be lower than the actual outlet pressure, the feedback pressure under the main diaphragm becomes smaller, the diaphragm moves downward, and the opening of the valve disc becomes larger, making the adjustment The outlet pressure of the pressure regulator is increased to achieve the purpose of compensating the spring effect, but the pressure field of the outlet cavity inside the valve body is relatively complex and disordered, so it is difficult to find a suitable position for the signal tube port. If the signal tube is installed in a position If it is improper, it will not be able to compensate for the spring effect, so a lot of experiments are needed, and even the structure of the valve body can be changed to achieve good results.

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