SU759785A1 - Gate closure - Google Patents

Description

The invention relates to vacuum technology and can be used in ultra-high-vacuum heated installations designed for pumping 5 large volumes.

A device is known which comprises a housing, a plate-shaped closure member comprising a support and a seal. stitches, flexible element that provides the transfer of sealing force [1].

The disadvantage of the design is that the known design does not allow for additional vacuum pumping of the internal cavity of the shutter and thereby reduces the reliability of the overlap of the flow area.

The aim of the invention is to eliminate these disadvantages, as well as improving the reliability of the design;

The goal is achieved by the fact that the removable sealing elements are made in the form of plates, which are mounted on movable discs and hinged with them, and the cavity formed between the plates and the discs is in communication with the internal cavity of the housing.

FIG. 1 shows a shutter with a side. DPL bore hole; in fig. 2 - 3θ

Section A-A in FIG. 1, in the position prepared for the overlap of the passage.

The shutter consists of a body representing a flat box formed by the adapter 1 ,. welded to the shell 2, and two lids 3, which are also welded to the shell 2. In 10 lids, two through holes are made: one for connecting to the vacuum line, the other, closed by flanges 4, for changing the sealing gaskets 5 fixed by side 5 conical surfaces between the elastic (spring) rings 6 on the support holes of the sealing plates 7. The plates 7 are hinged around the perimeter by a mountain-like top of the contact spacing on the support disks of the gate 8 and are provided with holes 9 for pumping the cavity between the plates 7 and dis s 8. Wheels 8 perimeter geometry DK welded bellows 10 are connected through the support ring 11 with the carrier Box gate 12. Support rings 11 slide along the slide guide 13 ^ fixed in the housing and providing ploskoparallelnoe slide relative movement kryaiek

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enclosures. The discs 8 are tightened to each other in the shoulder of the box 12 by means of compression springs 14. For this purpose, oblique washers 15 equipped with longitudinal grooves are welded into one of the discs. They engage with spring-loaded rods 16 installed in the opposite disc. The spring is pre-compressed by the cups 17. £ the carrier box 12 is welded by the carrier 18. The carrier 18 is mounted on axis 19 in a bracket 20 located inside the swinging bellows 21 and fixed to adapter 1.

The movement of the gate inside the housing can be carried out manually or with a pneumatic cylinder with a pneumatic distributor embedded in the fixed rod. To ensure heating, the pneumatic cylinder is made of all-metal, moving along a rod fixed on the adapter 1, and connected to a carrier 18 through a spherical bearing 23 and a lever 24. Inside the hollow, equipped with side grooves, the lever 24 is mounted on a geometric axis of swing of the bellows 25, connected at one end with carrier 18, with pneumatic and vacuum lines.

The installation of the movable pneumatic cylinder 22 and the swinging bellows 25 allows you to connect pneumatic and vacuum lines to the gate by rigid pipes without additional flexible elements.

Works gate valve as follows.

In the open position, the gate together with the sealing gaskets 5 is retracted to the side along the guide 13. For this, the cavity between the discs 8 communicates with the atmosphere or an additional pumping line, and in the case of hydro-filling of the gate, the accumulator is turned off and the piston is retracted by the required amount. The springs 14 tighten the discs 8 up to the stop into the collar of the box 12, which provides a gap between the bearing surfaces of the housing and the gaskets '5 and prevents their damage when the gate is moved. The gap between the folded disks 8 to reduce the cavity filled by the pressure transmitting medium is selected in the range of 0.3-0.5 mm. *

To close the gate by means of the carrier 18 manually or by the pneumatic cylinder 22, it is installed coaxially with the gate through hole, after which, through the pipe of the carrier 18, through the bellows 25, air is fed under pressure into the cavity between the discs 8 or the accumulator is switched on. The discs 8 move by folding the bellows 10.

Sealing plates 7 are made in the form of thin plates provided with a thickening along the perimeter for the formation of contact surfaces: flat for changeovers 5 and toroidal for contact with locking plates 7. Contact toroidal surfaces between the plates of the 7th disc 8 exclude the possibility of deforming the reference surfaces the plate 7 when closing. gate and deformation of the disk from the pressure of the medium. Thanks to a small gesture. the bones of the sealing plates 7, the gaskets, the ki 5'as self-fitting on the support surfaces of the body caps. The internal cavity of the shutter is pumped out with an additional vacuum pumping line. The gap between the plates 7 and the discs 8 communicates with the internal cavity of the valve body through the holes 9.

Change the gaskets 5, if necessary, through the holes closed by flanges 4.

Claims (1)

Claim The slide valve, in the case of which there is a shut-off element mounted on the carrier and equipped with movable hard disks, hermetically connected by a flexible element with the carrier carrier, and removable sealing elements are installed on the plates, so that. :> Increased reliability, removable elements made in the form of plates, which are mounted on movable disks and pivotally connected with them, and the cavity formed between the plates and disks, communicated with the internal cavity of the housing.