Driving device and driving method for slow-opening quick-closing safety valve

Abstract

The invention belongs to the technical field of safety valves, relates to safety valves for controlling of a fuel gas and oil conveying process, and particularly relates to a driving device and a driving method for a slow-opening quick-closing safety valve. The driving device is characterized in that one end of a lever is respectively connected with the end of a valve rod and a valve rod spring, the other end of the lever is connected with a lever spring and connected with a supporting rod through a roller. One end of a pull rod is connected to the middle of the lever, the other end of the lever is provided with a cylindrical protrusion, one side of the pull rod is provided with a curve cam, the side line of the curve cam is in contacted tangent with the cylindrical protrusion, and a rotary shaft of the curve cam is arranged in a key groove of the pull rod and moves up and down in the key groove along with the rotation of the curve cam. Slow opening is realized by means of the involute type curve cam while quick closing is realized by means of the spring lever principle, a spool can be easily and stably opened only by using a low-power motor to drive the cam, no electromagnetic coil is needed, and no large parts such as cylinders of pneumatic spools and the like is needed. Moreover, the spring is used for driving in closing, valve closing is quick, and the service life of the valve is long.

Description

technical field [0001] The invention belongs to the technical field of industrial process control safety valves, and relates to a safety valve for gas and fuel oil transmission process control, in particular to a driving device and a driving method for a slow-opening and fast-closing safety valve. Background technique [0002] Safety valves are generally composed of valve body, valve core, driving device, etc., and are widely used in thermal power, petroleum, shipping, steelmaking, chemical, pharmaceutical and other industries, especially in some industrial fields related to production safety. , The safety valve responsible for fluid control must close the spool and cut off the fluid in the shortest possible time, so as to reduce losses or avoid accidents. Therefore, the importance of safety quick-break valve technology and reliability is self-evident. [0003] At present, there are two main types of quick-closing valves in the world. One is the pneumatic quick-closing val...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing quick-break safety valve core drive mechanism, such as long response time and short life, and provide a slow-opening and fast-closing safety valve drive device and its driving method, so as to realize slow opening of the valve core and reduce instantaneous flow impact , and quickly close the spool to achieve the purpose of safety protection

Images