Description

The quick opening closure is a mechanical device used for the circular opening of the pressure pipeline and can achieve rapid opening or closing. It is generally composed of an end flange, a head cover, a hook or clamp, a seal ring, a safety interlock mechanism, an opening and closing mechanism, a rotating arm, and a nipple (if necessary). The commonly used quick opening closure is divided into typical structures such as clamp type, latch type, lock ring type, etc., which is mainly manual operation and is widely used in the equipment that needs to be frequently opened and closed in the petrochemical industry, especially in the field of natural gas. In the past ten years, the domestic natural gas industry has been developing rapidly, It is necessary to build a wider and more perfect transmission and distribution system, so it is necessary to use a large number of fast-opening blind plate products characterized by fast-opening and closing structure.

Structure

Quick opening closure consists of quick opening closure large flange, quick opening closure pressure element, quick opening closure clamp ring, quick opening closure seal, interlocking plate, door shaft assembly, and other components, with sealing function, interlocking control function, interlocking linkage function, alarm function, locking function, safety interlocking function.

1. The lock ring structure consists of a quick opening closure large flange, quick opening closure pressure element, quick opening closure clamp ring, quick opening closure seal, interlocking plate, door shaft assembly, and other components. The groove welded to the outer shell is machined and formed.

Lock ring type quick opening blind plate main function

① Sealing function Quick opening closure sealing structure includes “U” type self-storage gasket + spring.

② Interlock control function When the quick-opening blind ring (lock block) reaches the predetermined closing position (into the flange slot), the interlock control function can boost the pressure operation;

③ Interlock linkage function When the internal pressure of the pressure vessel is completely released and the safety interlock device is removed, the quick opening closure can be opened.

④ Alarm function The quick opening closure has a safety interlock device, and the safety vent alarm screw is connected with two lock rods. When the quick opening closure lock block enters the flange slot, then the 2 long pins on the inner lock plate are inserted into the lock hole of the ring lock; A short pin entry hole prevents the action of the rotating ring, and then screw on the safety vent alarm screw, then the pressure can be increased to run if the 2 long on the inner lock plate are not inserted into the lock hole of the ring lock, the safety vent alarm screw will alarm. On the contrary, when the internal pressure of the pressure vessel is completely released, the safety interlock device can be removed. If there is still pressure inside the pressure vessel, the safety vent alarm screw will also alarm. Empty screws prevent the container from opening under pressure. When unloading the empty screw, if you hear the alarm sound or the oil leaks out, the inner lock plate should not be removed, and the empty screw is screwed back, it means that there is residual pressure/oil in the container, and it will continue to drain or empty the container.

Overall structural advantage

The locking ring type quick opening closure relies on the expansion and expansion of the locking ring to open and close the blind plate. Compared with other types of quick opening closures such as tooth insert type, clamp type, buckle type, etc., the structure is simple and the operation is convenient, especially for the large-caliber high-pressure quick opening closure. At the same time, because the size of the quick opening closure changes greatly, there is a certain edge effect and stress concentration, and it is necessary to determine whether the stress intensity and distribution are reasonable, Conventional analytical methods are difficult to do. Therefore, finite element analysis was used for the compression element of the shutter blind plate to simulate the stress situation of the quick opening closure, obtain its internal stress and stress intensity, especially the stress situation in the sudden change area, to ensure that the stress distribution is reasonable, and ensure that the load area of the entire quick opening closure meets the strength and related standards while optimizing the structure as much as possible.

Use a partially enhanced lock ring

The lock ring is a key component connecting the head cover and the end flange, which should be attached to the end flange when it is tightened, and enter the head cover when it is released. The common lock ring adopts the whole flat steel type, which is easy to deform in the process, affecting the sealing effect and even causing medium leakage. The enhanced split lock ring is made of block lock ring components in series. Compared with similar products, the centroid section moment of inertia increases several times, greatly enhances the shear load resistance and compressive load resistance of the lock ring, and can always maintain a circular ring, so that the lock ring is stressed evenly and retracted freely.