DE102008059109A1 - Device for closing or opening the flow cross-section of pipelines, in particular in vacuum systems - Google Patents

Abstract

The invention relates to a device for closing or opening the flow cross section of pipelines, in particular in vacuum systems for the metallurgical treatment of liquid metals, which has an eccentrically arranged in an existing pipe to pipe casings on a sealing shaft arranged, sealed in the closed position against the tubular body housing pivoting flap to whose pivotal movements a drive means engages the rotary shaft. In such a device a simpler and more reliable swing flap is to be created. For this purpose, the sealing flap sealing the sealing means is formed as in the closed position of the pivoting flap radially expandable, connected to a pressure medium supply inflatable seal.

Description

The The invention relates to a device for closing or opening the flow cross section of pipelines, in particular in vacuum plants for the metallurgical treatment of liquid Metals that are eccentric in an existing piping connectable tubular body housing on a rotary shaft arranged, in the closed position against the tubular body housing sealed pivoting flap has, for the pivoting movements of a drive means to the rotary shaft attacks.

By the DE 195 30 224 A1 Such a shut-off or control flap has become known, which is used for both liquid and gaseous media, both at high and at low temperatures, for example in district heating networks, in hot water or steam pipes, in networks for gases in the Process engineering or the like. The preferably in a housing double eccentrically pivotally mounted flapper has a seal assembly with a valve disc associated housing ring, being provided for sealing with the disc closed between this and the housing ring, a sealing element which rests with a sealing surface on a seating surface. The sealing surface of the sealing element is formed as part of a spherical surface or spherical surface, wherein a substantially linienförmi ge contact pressure of the sealing element is predetermined to the seat. The sealing element can be fastened directly on the valve disc or the housing ring.

On the one hand the contact surface as part of a spherical surface and on the other hand sets the associated conical sealing surface a large production effort ahead. Although by the contour adjustment when closing and opening reduced frictional forces occur, it is still a high force necessary to keep the seal reliable in the Seat to push, all the more for the metal preferred sealing elements applies. This requires a complex, stiff Flap construction as well as shaft bearings and a corresponding powerful drive, z. B. hydraulic cylinder with mounted hydraulic unit or an electric rotary drive. Nevertheless, with heavy valves, as in vacuum systems with dimensions of for example 900 mm diameter and 2500 kg weight used not always guarantee the required tightness.

From the DE-Utility Model No. 1 861 793 It is known to provide in vacuum systems instead of pivoting flaps in the continuing lines a barrier for vacuum-tight sealing in the form of linearly movable, a seal-bearing valve plates. To close the valve disk is pressed against the bottom of the valve housing, while it is raised as possible to open over the upper edge of the opening of the connecting piece to the continuing vacuum line.

Of the Invention is based on the object in a device of initially mentioned type, in particular for use in vacuum systems with gas cooler, to create an improved seal that with less effort an even greater operational safety allows.

These The object is achieved according to the invention in that the sealing flap sealing sealing means than in the closed position the pivoting flap radially expandable, to a pressure medium supply connected, inflatable seal is formed. hereby can achieve a simple-build, functionally safe swing flap, to brush only about 95% of the clear pipe diameter needs, d. H. not pressed or pressed into a sealing seat must become. Since thus no special force is necessary, enough for the rotation of the flap plate a small pneumatic cylinder out, so no hydraulic cylinders with appropriate hydraulic power unit more are needed. Because as soon as the swing flap their the pipeline locking locking position without any frictional resistance has reached, the expandable seal can be through Turn on the pressure medium supply pneumatically inflate, taking she then with a tight sealing bead on the outer circumference the pivoting flap presses or -legt.

A preferred embodiment of the invention provides that the Seal at a provided in the tubular body housing, provided with pressure medium supply, metallic support ring is arranged. This not only allows a simplified seal change, but allows in interaction with the opposite the well-known hinged flaps smaller diameter a clear Weight savings. In vacuum systems with the aforementioned dimensions The weight can be reduced by about 40%.

To a proposal of the invention, the seal in cross-section is C-shaped and a holding head of the support ring form-fitting cross-over educated. This results in a simple installation or when Seal replacement Dismantling as the non-pressurized gasket is simply put on or can be deducted. In inflated operating condition can she herself from her recording freely accessible for installation do not unclip from the holding head in the support ring because the Swing flap simultaneously acts as an anvil.

It is recommended, especially when used in exhaust pipes of vacuum systems with there even more noticeable heat of about 300 ° C, that the seal is made of an elastic, temperature resistant Material, preferably silicone, consists.

Further Features and details of the invention will become apparent from the claims and the following description of one in the drawings schematically illustrated embodiment of the invention. Show it:

1 in a section along the line II of 2 a device for closing or opening the flow cross section of pipelines, designed as a tubular body housing which can be flanged to a pipeline and has a pivoting flap arranged therein;

2 a section along the line II-II of 1 wherein the pivoting flap is shown in solid lines in the closed or blocking position and dash-dotted in the open position;

3 as a detail in cross section a the flapper valve against the tubular body housing sealing, pneumatically inflatable seal; and

4 in an enlarged view the detail "X" of 2 ,

In 1 is as a detail of a device for closing or opening the flow cross-section of vertically or horizontally extending pipes a tubular body housing 4 with a pivoting flap arranged therein 1 shown. The swing flap 1 is about support posts 3 eccentric on a rotary shaft 2 stored by the tubular body housing 4 with seals 11 led in the Ge housing wall and at its two outer ends in bearing blocks 12 is supported. For connecting to existing or continuing pipelines 13 is the tubular body housing 4 with suitable connecting pieces or flanges 14 Mistake. In the 2 drawn with solid lines pivoting flap 1 which gives the pipeline 13 closing position again, and the dashed lines leave the open position in the tubular body housing 4 adjusted pivoting flap 1 detect.

The diameter of the swing flap 1 is smaller than the clear cross-section of the piping, so the pivoting flap 1 in free space, without contact to the pipeline 13 or to the inner wall of the tubular body housing 4 can be moved into the open or closed position. The pivoting circles or paths of the pivoting flap 1 are in 1 dash-dotted registered and with 1a . 1b quantified. For rotation of the swing flap 1 Therefore, a smaller, if necessary, an articulated lever to the rotary shaft 2 attacking pneumatic cylinder 15 (see. 2 ) out. This also because, when moving the pivoting flap 1 in the closed position no frictional forces must be overcome and the pivoting flap 1 also does not have to be pressed into a sealing seat.

Because of the swing flap 1 is in the closed position in the tubular body housing 4 circumferentially provided, radially expandable, inflatable seal 5 assigned (compare 4 ). The connectable to a pressure medium supply, inflatable seal 5 can be designed as any tubular, has in the embodiment according to 3 However, a substantially C-shaped cross-section with at the free end facing each other formed latching or hooking projections 6 , It can thus be a simple assembly or disassembly of the inflatable seal 5 reach, namely on a holding head 7 one with the tubular body housing 4 bolted, metallic support ring 8th can be buttoned on or off.

By the against the tubular body housing 4 with a full seal 9 sealed support ring 8th are up through the holding head 7 passed through pressure medium supply holes 10 trained as in 4 shown. When the flapper 1 has taken its closed position needs via the pressure medium supply bores 10 to be initiated by the supply source, not shown, only compressed air or the like, whereby the inflatable seal 5 radially widening (compare in 3 and 4 the dot-dash line schematically drawn widening position 5 ' ) and in this operating position the scope of the pivoting flap 1 safe against the tubular body 4 or the continuing pipeline 13 seals.

1

swiveling flap

1a

Swing circle / travel

1b

Swing circle / travel

2

rotary shaft

3

support bracket

4

Pipe body case

5

inflatable poetry

5 '

Aufweitposition

6

Latching / hooking

7

holding head

8th

support ring

9

full seal

10

Pressure medium feed bore / input

11

seal

12

bearing block

13

pipeline

14

Connecting branch / -flange

15

Drive means / pneumatic cylinder

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19530224 A1 [0002]
• - DE 1861793 U [0004]

Claims (5)

Device for closing or opening the flow cross-section of pipelines, in particular in vacuum systems for the metallurgical treatment of liquid metals, which has an eccentrically arranged in a pipe body housing can be connected to existing pipes on a rotary shaft, sealed in the closed position against the tubular body housing pivoting flap, to the pivoting movement of a drive means engages the rotary shaft, characterized in that the pivoting flap ( 1 ) sealing sealing means than in the closed position of the pivoting flap ( 1 ) radially expandable, connected to a pressure medium supply inflatable seal ( 5 ) is trained. Device according to claim 1, characterized in that the seal ( 5 ) at one in the tubular body housing ( 4 ), with pressure medium supply bores ( 10 ), metallic support ring ( 8th ) is arranged. Apparatus according to claim 2, characterized in that the seal ( 4 ) in cross-section C-shaped and a holding head ( 7 ) of the support ring ( 8th ) is formed positively overlapping. Device according to one of claims 1 to 3, characterized in that the seal ( 5 ) consists of an elastic, temperature-resistant material. Apparatus according to claim 4, characterized by a seal ( 5 ) made of silicone.