Device for sealing plate valve through pretightening

Abstract

The invention provides a device for sealing a plate valve through pretightening. The device comprises the plate valve, a plate valve seat, a torsion spring, a pin, an inner barrel, an outer barrel and a locating pin, wherein the plate valve seat is connected with the outer barrel by a thread; the axis of rotation of the plate valve coincides with the center line of the torsion spring; the plate valve is connected with the plate valve seat by the pin; the locating pin is arranged at one end of the pin; the torsion spring has double-side elasticity; the free ends at the two sides of the torsion spring are inserted into deep holes reserved on the plate valve seat; and the middle extension section of the torsion spring is contacted with the upper end face of the plate valve. The device has the following beneficial effects: before the plate valve closes, the elasticity acts on the upper end face of the plate valve to realize automatic closing of the plate valve; and after the plate valve closes, the lower end face of the plate valve is contacted with the narrow ring surface protruding from the middle of the plate valve seat, and as the contact area of the ring surface is small and the contact surface of the plate valve and the plate valve seat slants relative to the plate valve seat, the impact of the impurities on the contact surface is reduced and sealing is easier to realize, thus ensuring the self-tightness of the plate valve and improving the reliability of other operations.

Description

technical field [0001] The invention relates to a natural gas hydrate coring operation device, which belongs to a special operation for new energy exploration and development. Background technique [0002] Carrying out the circular flap valve that coring operation uses is to rely on torsion spring and self gravity to close and preload at present. After closing, the conical surface of the plate valve is in close contact with the inner wall of the plate valve seat under the action of the spring force of the torsion spring, the gravity of the plate valve itself and the pressure in the sealing chamber to realize sealing. However, due to the surface contact between the two, it is inevitable that mud and other debris will be caught on the contact surface during the coring process, resulting in poor sealing effect and low success rate of pressure retention, which cannot meet actual needs. Contents of the invention [0003] The technical problem to be solved by the present invent...

AI Technical Summary

Problems solved by technology

However, due to the surface contact between the two, it is inevitable that mud and other debris will be caught on the contact surface d

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