EP3650767A1 - Gas-tight shut-off valve - Google Patents

Abstract

The invention relates to a gastight butterfly valve (1) with a damper blade (10) which can be moved along a travel path (26) from an open to a closed position, in which the damper blade (10) is pressed gas-tight onto a valve seat (15) , wherein the flap leaf (10) is pivotally mounted on one side, a linear drive (20) is provided with which the flap leaf (10) can be moved and a link (25) is provided which specifies the travel path (26).

Description

The present invention relates to a gas-tight butterfly valve.

Butterfly valves are a valve for flow control, for example in a ventilation system. Gas-tight variants of a butterfly valve come e.g. when locking ventilation systems from security areas (containments).

From the DE 10 2015 111 908 A1 a gas-tight shut-off valve is known which comprises two valve leaves which comprise a flat component with which an opening can be closed, the valve leaves being rotatable and displaceable by an axis, the ends of which engage in a groove. The two flap blades are each flexibly connected to one another at one end of the flat component in an articulated area and can be moved by a drive element made of a material with shape memory properties, which is fastened to the articulated area or the flat components.

From the DE10 2007 013 665 A1 Mixing flap is known for the air flows of an air conditioning system, which comprises two flap blades, one of which is mounted asymmetrically. A joint is arranged on the asymmetrically mounted flap leaf, which engages in one end of the other flap leaf. By arranging the joint on the flow inlet side in the open position of the mixing flap, the inflowing air is directed outward in the direction of a surrounding housing in order to mix different air flows by means of negative pressure which is created behind the mixing flap.

From the DE 31 48 709 A1 is known a pivotally mounted butterfly valve, the pivoting movement between an open and closed position is effected by an electric motor drive.

There is a need for a gas-tight butterfly valve with a highly effective sealing performance which can be demonstrated from outside the valve housing with an inexpensive construction and low weight of the valve.

It is the object of the present invention to provide a gas-tight butterfly valve with a highly effective sealing performance which can be demonstrated from outside the valve housing with an inexpensive construction and low weight.

This object is achieved according to the invention by the features of claim 1. Advantageous refinements are specified in the subclaims.

Accordingly, the object is achieved by a gas-tight shut-off valve with a flap leaf which can be moved along a travel path from an open to a closed position in which the flap leaf is pressed gas-tight onto a flap seat, the flap leaf being pivotally mounted on one side, a Linear drive is provided, with which the damper blade can be moved and a backdrop is provided which specifies the travel path.

Due to the linear drive for the damper blade of the butterfly valve according to the invention in conjunction with a link control, a reliable sealing performance is achieved with an inexpensive construction even under stress.

The linear drive preferably comprises two synchronously running spindles, on each of which a spindle nut is connected to the flap leaf by means of an articulated guide in order to move the latter and to press it onto a sealing seat in its closed position via two pressure points. In addition, the backdrop on both sides of the damper blade includes two identical link guides in which the damper blade is guided over sliding bolts or roller bearings, which in the closed position press the damper blade additionally onto the sealing seat via two additional contact points. Thus, in this preferred embodiment, a total of four pressure points secure the damper blade in its closed position.

In favor of particularly effective drive power and high sealing quality, the swivel-mounted side of the Damper blade can be driven. The flap leaf is preferably pivotable by approximately 90 degrees.

• dass die Einleitung der Horizontalbewegung des Klappenblatts im ersten Drittel des Verfahrweges entlang der Kulisse durch ein Gefälle des Verfahrweges in der Kulisse begünstigt ist,
• dass das Klappenblatt im mittleren Drittel des Verfahrweges entlang der Kulisse in eine quasiparallele Position zum Klappensitz verbracht wird und ohne Berührung des Klappenblatts mit dem Klappensitz verfahrbar ist, und
• dass das Klappenblatt im letzten Drittel des Verfahrweges entlang der Kulisse aus einer quasiparallelen Position zum Klappensitz heraus senkrecht auf den Klappensitz angedrückt wird.

The setting for optimizing the travel path is advantageously designed in this way

• that the initiation of the horizontal movement of the damper blade in the first third of the travel path along the backdrop is favored by a slope of the travel path in the backdrop,
• that the flap leaf is moved in a quasi-parallel position to the flap seat in the middle third of the travel path along the backdrop and can be moved with the flap seat without touching the flap leaf, and
• that the flap leaf is pressed vertically onto the flap seat in the last third of the travel along the backdrop from a quasi-parallel position to the flap seat.

In order to optimize the sealing function provided by the flap leaf in the closed position, it is advantageously provided for larger flap dimensions that a projection is provided above the flap seat, which is arranged such that the flap leaf comes to lie in the closed position between the flap seat and the projection.

The gas-tight flap according to the invention can also be provided with two flap blades which are designed, controlled and driven in an identical (symmetrical) manner. For this purpose, it is advantageously provided that the flap comprises a further flap leaf in a mirror-image arrangement, which is pivotably mounted on the same side as the above-mentioned flap leaf and can be moved under the control of the same linear drive as this by means of a link for specifying the travel path, which is the backdrop of the corresponds to the first-mentioned flap.

Further details and advantages of the invention will now be explained in more detail using an exemplary embodiment shown in the drawings.

Fig. 1

eine schematische Darstellung einer Ausführungsform der erfindungsgemäßen gasdichten Klappe mit zwei Klappenblättern in geschlossener Stellung,

Fig. 2

eine Seitenansicht der Klappe von Fig. 1, wobei auf einer Seite ein Wandelement des Klappengehäuses zur Klarheit der Darstellung entfernt ist,

Fig. 3

eine schematische Darstellung des Dichtsitzrahmens für die beiden sich hier in geöffneter Stellung befindlichen Klappenblätter der Klappe von Fig. 1 und für ihre Kulissenführung und Betätigung,

Fig. 4

eine Seitenansicht der Anordnung von Fig. 3, und

Fig. 5

eine schematische Detailansicht einer Ausführungsvariante des Klappensitzes der erfindungsgemäßen Klappe.

Show it:

Fig. 1

1 shows a schematic illustration of an embodiment of the gastight flap according to the invention with two flap blades in the closed position,

Fig. 2

a side view of the flap of Fig. 1 , on one side a wall element of the flap housing being removed for clarity of illustration,

Fig. 3

is a schematic representation of the sealing seat frame for the two flap leaves of the flap of FIG Fig. 1 and for their setting and operation,

Fig. 4

a side view of the arrangement of Fig. 3 , and

Fig. 5

is a schematic detailed view of an embodiment of the valve seat of the valve according to the invention.

In the Fig. 1 shown gas-tight flap 1 comprises a cuboid housing 2 with four side walls, of which only three side walls 3, 4 and 5 are shown, while the fourth side wall is disassembled. The housing 2 is open on its upper and lower sides (inflow and outflow sides). In the underside of the housing 2, a load-bearing sealing seat frame 6 is used for two rectangular flap blades 10 and 10 'and for their guidance and drive. From two opposite sides of the sealing seat frame 6 there are webs 7 and 7 '(on the 2 opposite side walls, arranged perpendicular to the linear drive and above the sealing seat of the damper blade), which extend to the side walls 3 and 4 and scenes 25, 25a and 25 ', 25a' to define a travel path 26 of the damper blades 10 and 10 ', as explained in more detail below.

The sealing seat frame 6 comprises, on both sides of its longitudinal center axis, parallel to it, two spaced-apart central struts, of which in Fig. 3 only the strut 8 is visible, which serve as a support for a respective inner longitudinal edge of the two flap blades 10 and 10 'in the closed position, the tops of the outer longitudinal struts 9 and 9' of the sealing seat frame 6 supports for the outer longitudinal edges of the two flap blades 10 and Form 10 'in the closed position. These supports form part of a flap seat 15 explained in more detail below. The other two opposite side struts 12, 13 of the sealing seat frame 6 form supports for the narrow sides of the flap blades 10 and 10 'which are in the closed position. The flap blades 10 and 10 'advantageously comprise on its underside peripheral sealing elements which ensure a tight fit of the flap leaves 10 and 10 'in the closed position on the sealing seat frame struts. In addition, compressive forces acting on the longitudinal edges of the flap leaves 10 and 10 'in the closed position contribute to a tight fit of the flap leaves 10 and 10' on the sealing seat frame struts.

The two central struts (of which only the strut 8 in Fig. 3 is visible) of the sealing seat frame 6 carry spindle bearings of a motor-operated spindle drive 20 for the two flap blades 10 and 10 '. The spindle drive 20 comprises two spindles 21 and 22 which engage with their lower ends in the spindle bearings, extend perpendicularly upwards from these and engage with their upper ends in abutments which are accommodated in a rail-like, elongated housing 23 which is attached to the Inside of the side wall 5 and in Fig. 1 unmounted opposite side wall is fixed and extends parallel and opposite to the central struts of the sealing seat frame. Nuts 24 and 24a sit on the threaded spindles 21 and 22 as drive transmission elements and are connected via joints to the inner longitudinal edges of the flap blades 10 and 10 '(see FIG. Fig. 3 ).

Due to the upward and downward movement of the nuts 24 and 24a along the spindles 21 and 22, the longitudinal edges of the valve leaves 10 and 10 'experience a lifting movement in the vertical direction, which is due to the end guidance of the outer longitudinal edges of the valve leaves 10 and 10' in the scenes 25, 25a and 25 ', 25a' for determining the travel path 26 of the damper blades from their in Fig. 3 and 4th Open position shown in the in Fig. 1 shown closed position is implemented. The flap leaves 10 and 10 'are guided in the scenes 25, 25a and 25', 25a 'by slide bolts or roller bearings which are fixed in the opposite ends of the outer edge of each flap leaf and protrude from there into the scenes.

In the closed position, the outer longitudinal edges of the flap blades 10 and 10 ', which are in this position in a horizontal position, interact with the flap seat 15, 15', which supports the support in the form of the tops of the longitudinal struts 9 and 9 'of the rectangular sealing seat frame 6 and one includes wedge-shaped projection 16, which is fixed to the inside of the housing side wall 3 and extends along this (s. Fig. 5 ). Due to the fact that the outer longitudinal edges of the damper blades during the final movement of the cap leaves 10 and 10 'run into their horizontal opening position with their upper side on the inclined surface of the respective projection and are driven along by the spindle drive along them, the seals on the underside of the valve leaves are replaced by a gas-tight seal along the outer edge of the valve leaves outward horizontal movement of the valve blades 10 and 10 'compressed.

The seals on the underside of the damper blades are also driven by the spindle drive in this last phase of its drive activity over the entire length of the two central sealing seat frame struts (only the strut 8 in is shown Fig. 3 ) compressed by the downward force of the spindle drive over the inner edges of the damper blades. As a result of the compression at their inner and outer longitudinal edges of the sealing seat frame 6, the seals on the narrow sides of the sealing seat frame 6 also experience a compression, so that they provide a gas-tight seal along the entire outline of the flap leaves 10, 10 '.

• die Einleitung der Horizontalbewegung der Klappenblätter im ersten Drittel des Verfahrweges 26 entlang den Kulissen ist durch ein Gefälle des Verfahrweges 26 in der Kulisse 25 begünstigt,
• die Klappenblätter werden im mittleren Drittel des Verfahrweges 26 entlang den Kulissen in eine quasiparallele Position zum Klappensitz 15 verbracht und sie sind ohne Berührung der Klappenblätter mit ihrem jeweiligen Klappensitz 15 verfahrbar ist, und
• die Klappenblätter werden im letzten Drittel des Verfahrweges 26 entlang den Kulissen aus einer quasiparallelen Position zum Klappensitz 15 heraus senkrecht auf den Klappensitz 15 angedrückt.

The scenes 25 and 25 ', 25a and 25a' for providing the travel path 26 of the flap blades 10 and 10 'which can be pivoted by approximately 90 degrees have a special arc shape which does the following:

• the initiation of the horizontal movement of the damper blades in the first third of the travel path 26 along the scenes is favored by a slope of the travel path 26 in the scenery 25,
• the valve leaves are placed in the middle third of the travel path 26 along the scenes in a quasi-parallel position to the valve seat 15 and they can be moved with their respective valve seat 15 without touching the valve leaves, and
• the valve leaves are pressed vertically onto the valve seat 15 in the last third of the travel path 26 along the scenes from a quasi-parallel position to the valve seat 15.

Reference symbol list

1

gastight flap

2nd

casing

3rd

Side wall

4th

Side wall

5

Side wall

6

Sealing seat frame

7, 7 '

web

8th

central strut

9, 9 '

Longitudinal strut

10, 10 '

Damper blade

11, 11 '

Sliding bolt

12

Side strut

13

Side strut

15

Flap seat

16

head Start

20th

linear actuator

21

spindle

22

spindle

23

casing

24th

mother

24a

mother

25, 25 '

Backdrop

25a, 25a '

Backdrop

26

Travel

Claims (9)

Gas-tight butterfly valve (1) with a flap leaf (10) which can be moved along a travel path (26) from an open to a closed position in which the flap leaf (10) is pressed gas-tight onto a flap seat (15), whereby
the flap leaf (10) is pivotally mounted on one side,
a linear drive (20) is provided with which the flap leaf (10) can be moved and
a backdrop (25) is provided which specifies the travel path (26). Butterfly valve (1) according to claim 1, characterized in that the linear drive (20) is a spindle drive. Butterfly valve according to one of the preceding claims, characterized in that the pivotally mounted side of the flap blade (10) can be driven by the linear drive. Butterfly valve (1) according to one of the preceding claims, characterized in that the flap leaf (10) can be pivoted by approximately 90 degrees. Butterfly valve (1) according to one of the preceding claims, characterized in that the initiation of the horizontal movement of the damper blade (10) in the first third of the travel path (26) along the link (25) by a gradient of the travel path (26) in the link (25 ) is favored. Butterfly valve (1) according to one of the preceding claims, characterized in that the flap leaf (10) in the middle third of the travel path (26) along the link (25) is brought into a quasi-parallel position to the flap seat (15) and without touching the flap leaf ( 10) can be moved with the flap seat (15). Butterfly valve (1) according to one of the preceding claims, characterized in that the flap leaf (10) in the last third of the travel path (26) along the link (25) from a quasi-parallel position to Flap seat (15) is pressed vertically onto the flap seat (15). Butterfly valve (1) according to one of the preceding claims, characterized in that a projection (16) is provided above the valve seat (15), which is arranged such that the valve leaf (10) in the closed position between the valve seat (15) and the projection (16) comes to rest. Butterfly valve (1) according to one of the preceding claims, characterized in that the flap (1) in a mirror-image arrangement comprises a further flap leaf (10 ') which is pivotally mounted on the same side as the first-mentioned flap leaf (10) and with the same linear drive (20 ) how this can be moved, controlled by a link (25a) for specifying the travel path (26), which corresponds to the link (25) of the first-mentioned damper blade.

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