Small-flow anti-kick valve core structure of pressure regulator and size calculation method thereof

Abstract

The invention provides a small-flow anti-kick valve element structure of a pressure regulator, and belongs to the technical field of gas pressure regulating equipment in a gas transmission and distribution system. The small-flow anti-kick valve element structure of the pressure regulator comprises a valve body, a gas flow channel formed by a valve port or a valve seat and arranged in the valve body, and a valve element arranged in the valve body and movably connected with the flow channel in an inserted mode. The flow channel is a vertical through hole with the same inner diameter, the valve element is in an inverted cone frustum shape, and the diameter of the top face of the inverted cone frustum is matched with the inner diameter of the flow channel. According to the small-flow anti-kick valve element structure of the pressure regulator, the valve element is designed to be in the shape of the inverted cone frustum, the actual opening degree of the pressure regulator is larger than the original needed opening degree when the pressure regulator is in small flow, and therefore the pressure regulator is made to avoid the position in the most unstable state, and frequent surge in the small-flow interval is prevented. The invention further provides a size calculation method for the small-flow anti-kick valve of the pressure regulator, the final calculation formula obtained through the method is simple, the shape and size of the valve element suitable for the pressure regulator can be rapidly and accurately calculated, and the size design time of the valve element can be greatly saved.

Description

technical field [0001] The invention relates to the technical field of gas pressure regulating equipment in a gas transmission and distribution system, in particular to a structure of a small flow anti-kick valve core of a pressure regulator and a method for calculating its size. Background technique [0002] The gas pressure regulator is a diaphragm + spring-driven pneumatic component combination device, which controls the opening of the valve port through the elastic diaphragm pressure sensing and balancing with the spring loading force. The key performance indicators of the pressure regulator include: adjustment accuracy, closing pressure level, flow coefficient, etc. The test results of the key performance indicators determine the effective application range of the pressure regulator, including the accuracy range of the regulating pressure, the closing pressure accuracy level, and The effective flow range within the range of regulating pressure accuracy, this series of c...

AI Technical Summary

Problems solved by technology

[0006] 1. Cause the back pressure P2 to fluctuate up and down, and the fluctuation caused by surge will cause the upper and lower deviation value to exceed the accuracy range, thus affecting the real-time pressure control performance of the regulator. When the fluctuation range exceeds the downstream gas range, it will cause serious operation Fault;

[0007] 2. Surge belongs to high-frequency vibration, which will accelerate the wear of the internal parts of the voltage regulator and shorten the life of moving parts;

[0008] 3. When the surge occurs, the valve port of the pressure regulator and the valve port gasket are in frequent and rapid small-scale open-close-open-close reciprocating motions, which accelerates the wear of the valve port gasket sealing material and shortens the sealing time. life span;

[0009] 4. Surge will bring intense ups and downs at the same time, which will cause serious interference to on-site employees and residents outside the work area;

[0010] 5. Surge will also cause vibration of the pressure regulator and the front and rear connecting pipes, which cannot effectively prevent the surge of the pressure regulator for a long time. Once resonance occurs, there will be a risk of pipe weld fracture;

[0011] 6. The pressure fluctuation caused by surge will cause frequent measurement fluctuations of the meter, resulting in inaccurate measurement

[0014] Disadvantages: Increased equipment cost and floor space, and poor flow adaptability. Once the flow range changes, the opening of the throttle valve must be readjusted, and the operability is poor.

[0016] Disadvantages: The damper of the feedback signal needs to be debugged on site, and the debugging time is long, and the debugging is difficult; the flow adaptability is poor, and once the flow range changes, it must be re-tuned; after the damper filters the feedback signal, it will actually make the feedback signal Attenuation of the air pressure value, increasing signal distortion, which will cause other safety hazards

[0018] Disadvantages: The feasibility of retrofitting voltage regulators manufactured by different manufacturers is different, and the applicability may not be guaranteed, and the cost of retrofitting is high and the cycle is long

[0020] Disadvantages: high cost of pipeline reconstruction, long construction period, and the need to purchase additional small pressure regulators

At the same time, when the actual gas consumption increases, there is a problem that the modified pressure regulator cannot adapt to the new working conditions

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