A damper for use in flues and air ducts

Description

[0001] The object of the invention is a damper for use in flues and air ducts, which includes a frame with two stop edges and a hatch part that rotates in relation to this and is equipped with two sealing edges, which press against the stop edges when the damper closes and form two in-line shutoff edges, between which the shutoff gases can be led and in which the inner shutoff edge is formed of essentially rigid stop and sealing edges and the other shutoff edge is formed of at least one flexible blade and a stiff stop edge in the frame.

[0002] A shutoff damper according to the introduction is known from Finnish utility model number 1671, which also shows various other shutoff dampers. According to the state of the art, sealing blades manufactured from spring steel sheet are attached to the hatch part by means of a flat iron bar in such a way that the bolts penetrate both the flat iron bars and the spring steel blades. A construction of this type is difficult in terms of manufacturing technique and, due to thermal expansion, causes problems at high operating temperatures. The problems in manufacturing technique are due to the fact that it is difficult to make holes in a spring steel blade, while holes the same distance apart must also be made in the aforementioned flat iron bar.

[0003] A prior art damper is also known from US 5 159 954 A.

[0004] This invention is intended to remove the aforementioned drawbacks and create, in a simple manner, a shutoff damper suitable for high operating temperatures. The characteristics of the invention are described in the accompanying Patent Claims. The construction according to the invention permits movement due to thermal expansion, without the flexible sealing blade warping and breaking the seal. Other advantages and embodiments of the invention are described in connection with the following examples of applications.

[0005] In what follows, the invention is described by reference to the accompanying Figures, which show one shutoff damper according to the invention and its details.

Figure 1

shows the damper from the direction of the duct.

Figure 2

shows a cross-section of the damper in Figure 1 and a partial enlargement of the sealing edge.

Figure 3

shows an axonometric view of the sealing edge.

[0006] In the version of the shutoff damper shown here, frame 1 is divided into three sections, with a hatch 4 in each of them. These are connected to the frame component by means of axle 15 and can be rotated using a conventional mechanism. Sealing devices, which correspond to the stop edges in the frame, are located in the edges of hatch part 4. According to the partial enlargement in Figure 2, frame 1 includes stop edges 2.1 and 3.1, between which there is an air duct 12 placed to led the shutoff air to the intermediate space. In hatch component 4 has a sealing blade 5 of spring steel sheet fixed to it and on top of this a second spring steel blade 6 set to press against it, thus providing more pressure on the sealing edge. The first sealing edge 2 is formed in a known manner of a stop edge 2.2 in the frame and a sealing edge 2.1 in the hatch component 4. These do not bend more than the extent to which the stiff metal plate gives way. Here the thickness of the blade is typically 5 mm. Naturally, the thickness of the blade can vary in individual cases. The second shutoff edge 3 is also formed in what is, as such a known manner, of a rigid stop edge 3.1 in the frame and a flexible sealing blade 5 attached to the hatch, which forms a corresponding sealing edge 3.2. The sealing blade and the spring plate 6 on top of it are made from some suitable spring steel sheet, e.g. Inconell® . The second shutoff edge is stepped in a known manner so that a suitable tension arising in spring blade 5, when the first shutoff edge 2 is closed.

[0007] In a known manner, the width of the shutoff duct in the direction of the hatch section is 10 - 20 mm and the steps are 2 - 5 mm.

[0008] Here the sealing blade 5 and the spring blade 6 have ridges 9 on one side, by means of which they are attached to hatch part 4. Bar 7 can easily be set into the angle formed by the ridge, and presses plates 5 and 6 against bolts 11. Bar 7 is wedged into place with the aid of clip 10, which is in turn attached to the hatch section with the aid of bolt 11 and nut 11.1. The interval between the clips 10 is 2,0 - 4,0 times the size of the flexible part of blade 5. The diameter of bar 7 is 1,0 - 2,0 times the height of the ridge.

[0009] According to Figure 3, there are clips 10 at regular intervals holding bar 7 in place. Here it is advantageous to use a round rod, so that it only makes contact with spring blade 6 as a thin line. This permits the longitudinal movement of the blades due to thermal expansion, while they still retain their shape. For very high operating temperatures, the edge of the entire hatch section is covered with parts, when the lengths of short sections of blades 5 and 6 may be, e.g. 500 mm, and the distance between the sequential plates 1 - 1,5 mm. In addition, sealing blade 5 and spring blade 6 are mutually overlapped in such a way that their breaks occur at different places.

[0010] In one example, blades 5 and 6, which were 50 mm wide, before the ridges were formed, and 500 mm long were used. The clips 10 were at intervals of 110 mm and the diameter of the round rod was 12 mm.

Claims

1. A damper for use in flues and air ducts, which includes a frame (1) with two stop edges and a hatch (4) component that rotates in relation to this and is equipped with two sealing edges, which press against the stop edges when the damper closes and form two in-line shutoff edges (2, 3), between which the shutoff gases can be led and in which the inner shutoff edge (2) is formed of essentially rigid stop and sealing edges and the other shutoff edge (3) is formed of at least one flexible blade (5, 6) and a stiff stop edge (3.1) in the frame (1), characterized in that the flexible blade (5, 6) is secured to the hatch part (4) is such a way that a ridge (9) is formed in the edge of the flexible blade and that the hatch part further includes a rod (7) arranged to press against this, which locks the ridge (9) against bolts (11), or another similar stop.

2. A damper in accordance with Patent Claim 1, characterized in that the rod (7) is secured to the hatch part (4) at regular intervals by clips (10), which are locked to the hatch part by means of the aforesaid bolts (11).

3. A damper in accordance with Patent Claim 2, characterized in that the interval between the clips (10) is 2,0 - 4,0 times the dimension of the flexible part of the blade (5, 6).

4. A damper in accordance with Patent Claims 1 or 2, characterized in that the hatch part includes two flexible blades (5, 6) set on top of one another, which are each formed of a series of pieces one after the other at the edge, and which are overlapped in relation to each other so that the breaks are located at different locations in relation to each other.

5. A damper in accordance with one of the above Patent Claims 1 - 4, characterized in that the rod (7) is a round rod, with a diameter 1,0- 2,0 times the height of the ridge.

Ansprüche

1. In Rauchgas- oder Luftkanälen einzusetzende Klappe, die einen mit zwei Anschlagkanten versehenen Rahmen (1) und ein zu diesem schwenkbar angeordnetes Klappenteil (4) mit zwei Dichtungskanten umfasst, die beim Schließen der Klappe gegen die Anschlagkanten drücken und dabei zwei aufeinander folgende Sperrkanten (2, 3) bilden, zwischen die Sperrgas geleitet werden kann, wobei die innere Sperrkante (2) von einer im Wesentlichen starren Anschlag- und einer im Wesentlichen starren Dichtungskante und die andere Sperrkante (3) von wenigstens einem elastischen Blech (5, 6) und einer starren Anschlagkante (3.1) am Rahmen (1) gebildet wird, dadurch gekennzeichnet, dass das elastische Blech (5, 6) dergestalt an das Klappenteil (4) gebunden ist, dass am Rand des elastischen Bleches eine Kantung (9) ausgebildet ist und zum Klappenteil eine gegen dieses drückende Stange (7) gehört, die die Kantung (9) gegen einen Bolzen (11) oder dergleichen Anschlag verriegelt.

2. Klappe nach Anspruch 1, dadurch gekennzeichnet, dass die Stange (7) durch in bestimmten gegenseitigen Abständen angeordnete Klemmbügel (10), die mit den besagten Bolzen (11) am Klappenteil verriegelt sind, an das Klappenteil (4) gebunden ist.

3. Klappe nach Anspruch 2, dadurch gekennzeichnet, dass der gegenseitige Abstand der Klemmbügel (10) das 2,0- bis 4,0-fache der Abmessung des elastischen Abschnittes des Bleches (5, 6) beträgt.

4. Klappe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass zu dem Klappenteil (4) zwei übereinander angeordnete elastische Bleche (5, 6) gehören, deren jedes aus aufeinander folgenden, den Rand abdeckenden Segmenten besteht, die gegenseitig so überlappt sind, dass sich ihre Unterbrechungsstellen an voneinander abweichenden Stellen befinden.

5. Klappe nach irgendeinem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass als Stange (7) eine Rundstange eingesetzt wird, deren Durchmesser das 1,0- bis 2,0-fache der Kantungshöhe beträgt.

Revendications

1. Registre pour conduits de fumée et d'aération comprenant un châssis (1) muni de deux butées et un panneau (4) se mouvant rotativement par rapport à ce dernier et équipé de deux bords de fermeture qui viennent se presser contre les butées quand on ferme le registre et forment de la sorte deux bords de fermeture alignés (2, 3) entre lesquels les gaz d'obturation peuvent être dirigés et dans lequel le bord de fermeture interne (2) est constitué de façon essentielle de bords d'arrêt et d'étanchéité rigides, l'autre bord de fermeture (3) étant formé d'au moins une plaque flexible (5, 6) et d'une butée rigide (3.1.) fixée sur le châssis (1), caractérisé par le fait que la plaque flexible (5, 6) est fixée au panneau (4) de telle sorte que le bord de la plaque souple est pourvu d'une arête (9) et que le panneau comporte une barre (7) placée contre cette arête et se pressant sur cette dernière, et qui bloque l'arête (9) contre un boulon d'arrêt (11) ou un autre dispositif de ce genre.

2. Registre conforme à la revendication 1 caractérisé par le fait que la barre (7) est fixée au panneau (4) par des étriers (10) disposés à intervalles réguliers et rendus solidaires du panneau par l'intermédiaire des boulons (11) susmentionnés.

3. Registre conforme à la revendication 2 caractérisé par le fait que l'intervalle des fixations (10) équivaut à 2,0 - 4,0 fois la dimension de la partie flexible de la plaque (5, 6).

4. Registre conforme à la revendication 1 ou 2 caractérisé par le fait que le panneau (4) comporte deux plaques flexibles superposées (5, 6), composées chacune d'une série d'éléments adjacents recouvrant le bord et disposés de telle sorte que la limite entre les éléments d'une plaque se trouve à un endroit différent par rapport à la limite entre les éléments de l'autre plaque.

5. Registre conforme à l'une des revendications 1 à 4 caractérisé par le fait que la barre (7) est une barre cylindrique dont le diamètre équivaut à 1,0 - 2,0 fois la hauteur de l'arête.

Drawing