Pneumatic actuating mechanism for one-way damping valve

Abstract

The invention discloses a pneumatic actuating mechanism for a one-way damping valve and belongs to the technical field of catalytic cracking units of the petrochemical industry. The pneumatic actuating mechanism for the one-way damping valve comprises a first air cylinder, a second air cylinder, a shifting fork shaft, a shifting fork and an air cylinder reversing control unit. The rod portion of the shifting fork is fixedly connected with a valve shaft of the one-way damping valve. The air cylinder reversing control unit is used for controlling reversing of the first air cylinder and the second air cylinder. The pneumatic actuating mechanism further comprises an engagement and disengagement mechanism which is a cylinder body. The engagement and disengagement mechanism is provided with a guide groove in the longitudinal length direction. The two ends of the engagement and disengagement mechanism are fixedly connected with a piston rod of the first air cylinder and a piston rod of the second air cylinder correspondingly. The shifting fork shaft extends into a U-shaped opening formed in the end of the shifting fork and the guide groove in the engagement and disengagement mechanism. The shifting fork shaft can slide in the U-shaped opening and can conduct linear motion in the guide groove at the same time. The pneumatic actuating mechanism can improve the energy efficiency, guarantees that the one-way damping valve is closed under an emergency condition and protects the seal face of the one-way damping valve at the same time.

Description

technical field [0001] The invention relates to the technical field of catalytic cracking devices in the petrochemical industry, in particular to a pneumatic actuator for a one-way damping valve. Background technique [0002] A one-way damping valve is usually installed on the outlet pipeline of the main fan of the catalytic cracking unit in the petrochemical industry. When an accident causes the medium in the pipeline to flow backward, the one-way damping valve is quickly closed to prevent the medium in the pipeline from being damaged by the reverse flow of the main fan. The opening and closing of the one-way damping valve mainly depends on the matching pneumatic actuator to complete it. [0003] The existing pneumatic actuator for the one-way damping valve is a two-position pneumatic actuator, which mainly includes a cylinder, a shift fork, a shift fork shaft, a solenoid valve, and corresponding gas piping. The rod of the shift fork is provided with a through hole for con...

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: the existing two-position pneumatic actuator makes the one-way damping valve in the fully open position under normal conditions, resulting in excessive pressure loss in the pipeline , leading to a decrease in the energy efficiency of the catalytic cracking unit

At the same time, when an accident occurs, the one-way damping valve usually needs to be closed within 3 seconds. If it is closed at such a fast speed, severe mechanical collisions will occur, causing damage to the sealing surface of the one-way damping valve seat, resulting in deterioration of the sealing performance of the one-way damping valve. , can not play a good role in protecting the main fan

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