DE3128133A1 - Closure flap for airlines - Google Patents

Description

'Closing flap for air ducts "

The invention relates to a closure flap for air ducts, in particular larger diameter, which sits on a shaft guided through the pipe wall and held in bearings on the pipe wall, on which an actuator engages.

The invention has for its object to provide a closure flap of the to create the aforementioned type that closes tightly up to large line diameters and works reliably, but also is simply built and easy to assemble.

According to the invention, a resilient disc protruding from the edge of the closure flap is provided which, in the closed position of the closure flap, is bent at least approximately up to flat contact with the pipe wall.

The specified curvature fulfills the named ones with various effects Purpose:

It practically represents the greatest possible bend, namely from the perpendicular to the line axis by 90 ° into a parallel to the line axisc, and this corresponds to a gioichffälls vcrhiillnismüHip, p _t roiW lung

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the so formed sealing lip, which is also by the length of the section adjacent to the line swan is enlarged. This also eliminates major irregularities in the cross-section of the pipe, i.e. deviations in the circumference of the line from the circular shape or otherwise intended Form, safely bridged. This is all the more important, the larger the cable cross-section.

At the same time, the bend restricts the contact force of the sealing lip the pipe wall on the bending stress and excludes the much larger upsetting forces that occur with little or no bending develop. The bending stress, on the other hand, is sufficient. This is also particularly important for larger pipe diameters, where in addition to the greater length of the line and flap circumference to be sealed, the lever arms effective between this and the flap shaft are greater will.

This has a much more far-reaching effect in the same sense when opening the flap, since the compressive forces would multiply again here.

Apart from that, there will be greater compression forces when opening this prevents the force which the friction has to overcome as a result of the bending into an axis parallel to a large extent or is brought up completely in the direction of movement parallel to the pipe wall and engages and thus hardly any force component can arise perpendicular to the pipe wall, which would increase the friction.

Finally, the coefficient of friction is also flat Attachment less than when creating an edge.

The elastic disc, for example made of silicone rubber, neoprene o.a. consists, preferably extends over the entire valve surface and is interrupted at most in places for fasteners.

This eliminates other possible leaks, such as those around the inner circumference an annular sealing washer, excluded from the start.

Appropriately, the elastic disc sits between two sheet metal discs, from which the closure flap otherwise, i.e. the actual

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- 5 - borrowed flap, consists.

As a particularly advantageous development of the invention, it is proposed that that the closure flap with the elastic disc is held centrally in the line cross-section and thus the same all around Flexibility and contact conditions of the elastic disc in the Line wall are ensured by means of at least one ball bearing between the shaft and one outside on the line wall seated bush is formed in such a way that the balls between an annular shoulder on the inside of the bush and a seated in the socket, preferably screwed, abutment ring are guided and in a recessed on the circumference of the shaft grip annular groove.

This construction is extremely simple, especially for the present purpose suitable radial-axial bearing in which the axial bearing is two-sided.

The further configuration of the ball bearing is particularly advantageous, that said annular shoulder has a slope, from the circumference and from the outer end of the bushing inwards, and | or the abutment ring an abutment surface with radial inclination, from the circumference and from the inner end of the bushing inwards, has or have.

Apart from the fact that the slope corresponds to the radial-axial bearing function, this design enables an extremely simple one Assembly: You just let the balls collapse between the shaft and the circumference of the bushing, which is enlarged above the shoulder, and screw them in then insert the abutment ring; At the latest when the abutment ring hits the balls when screwing in, they are due to the inclination pressed radially inwards into the groove and center it radially and axially on itself.

Particularly simple, cost-saving to manufacture and labor-saving in the assembly, the ball bearing in the further embodiment is that the said socket consists of an inner socket which penetrates the line wall and rests with a collar on the inside of the line wall and one screwed onto it from the outside against the pipe wall

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Outer bushing consists, the outer end of the inner bushing the said Heel forms and the abutment ring is screwed into the outer sleeve and is preferably secured by a lock nut on the end of the abutment ring protruding from the outer sleeve is screwed against the end of the outer socket.

Finally, it is proposed that the line wall be between them enclosing clamping surfaces of the said collar and the outer bushing to be approximately conical and the end face of the inner bushing including the federal government with the inner surface of the pipe wall to be aligned. The inner surface of the pipe wall then reaches practically without discontinuity right up to the passage of the shaft, so that the elastic disc is in contact with it the pipe wall is not disturbed here either. About it is found more details below.

An extraordinary advantage, especially with large cable cross-sections, is finally to store the shaft on both sides in ball bearings of the type mentioned.

Since the ball bearings act as axial bearings on both sides, tensile and compressive forces from the pipe wall can be absorbed in the shaft and be held; the line diameter falling into the shaft is always on the, even against strong force attacks intended size. In addition to this diameter, this strengthens the entire cable cross-section on the flap many times over: The bending length is halved, and statically two arcs are created that are supported on the shaft. This is particularly important for pressure surges and the case of negative pressure in the air line. Due to such influences, cables with a larger diameter can stand here Diameter also over the highest standard size of 65 cm into consideration slightly out-of-round places can be indented.

For the elastic disk, we finally propose its attachment to lead past the line wall at a distance next to the passage of the shaft through the line wall or through the socket forming the line wall here and for this purpose the closure

flap to be attached to the shaft at a small distance from the axis of rotation. So far it has always been overlooked that a closure flap seated on the shaft axis through the annular gap of the aforementioned Shaft passage and the bearing can be bypassed by a small air flow.

In addition to its function as a closing flap, the flap can serve as a regulator flap.

The drawing shows an embodiment of the invention.

Fig. 1 shows, somewhat simplified, a section through a closure flap an air line, axial to the air line and at right angles to the flap shaft;

Fig. 2 shows a section along line 11-11 in Fig. 1;

FIG. 3 shows the detail II framed in FIG. 2 on a larger scale.

In an air line 1 sits on a centrally arranged in the line cross-section Shaft 2 a flap 3. The air line can be attached to the flap consist of a special housing. The flap can also be used in a normal line cross-section. The line cross-section is circular, but an adaptation of the flap is also possible to other, such as rectangular, cross-sections possible.

The shaft 2 is in two seated on the outside de air line 1 Ball bearings 4 of the following structure shown in FIG. 3 are supported :

One with a frustoconical collar 5 through a bore The inner socket 6 reaching under the pipe wall is provided with an external thread and with one consisting of a nut Outer bush 7 screwed, which with a counter surface 8 to the collar 5, the edge 9 of the line v / andung at the bore at Bolted on above the collar 5 and clamped in the assembled state snugly against the collar 5 and the mating surface 8 holds. The lower end face 10 of the inner socket fits essentially seamlessly and steplessly on the inside of the line

objection.

The outer sleeve 7 protrudes above the inner sleeve 6, so that the slightly inwardly inclined upper end face forms a paragraph IX therein. A ring 13 provided with an inclined abutment surface 12 on its underside is screwed into the upper, protruding part of the outer sleeve 12. This protrudes beyond the outer sleeve 7 and is secured by a lock nut 14 screwed on here.

The shaft 2 passing through the parts 5 to 14 has a groove 15 between the shoulder 11 and the abutment surface 12. A row of balls 16 is located partly in this and partly in the annular space between the shoulder 11 and the abutment surface 12 and thus both axially fixating to one another. The balls 16 were introduced before the ring 13 was screwed in.
Finally, an O-ring 17 in the ring 13 should be mentioned.

One end of the shaft protrudes beyond the ball bearing 4 and is connected to any actuator, of which only in the drawing a lever 18 is shown.

The flap 3 is adjusted centrally on the shaft 2 after its assembly and has been clamped by means of sliders 19 which are slidable on the shaft 2 and which pass through the flap 3 with short threaded bolts 20 and by means of nuts 21 screwed onto the other side of the flap.

The flap consists in detail of two sheet metal disks 22 and one between these clamped elastic disc / e.g. made of silicone rubber. The elastic washer 23 protrudes all around between the sheet metal. disks 22 out to form a sealing lip, which in the closed position of the flap has no gaps on the inner circumference of the pipe wall is present. The edge of the perforated disks 22 has the inner circumference of the pipe wall such a distance and the sealing lip has such a radial length that the sealing lip from the edge of the sheet metal disks 22 from initially runs in a pronounced curve 25 and then rests flat against the pipe wall with a section 26.

Only in the area of the shaft 2, where the bend of the sealing lip 24

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changes from one side to the other side of the flap 3, v / ird the sealing lip 2Λ narrower, except for a little more than that free space /. between the round of the Hlechscheibon 22 and the! .H-tungswandung 1 at the narrowest point. This can be seen in FIG. 2 at, but not shown in FIG. 3 = compression of the However, the sealing lip at this point does not affect the ability of the flap to work, as the opposing forces generated only with it be effective with a minimal lever arm.

The significance and effects of the new measures have already been explained in detail above.

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Claims (9)

β OO Ot O β O I) OO O DR.-ING.W. BERNHARDT 6600 SAARBRÜCKEN. Kobenhüttemreg 43 PATENTANWALT '' '"° N (Οί)" Π 65000 patent claims: 1.) Closure flap for air lines, especially larger diameters, which is seated on a shaft guided through the line wall (1) and held on the line wall in bearings (4) on which an actuating drive (18) engages, characterized by an elastic disc (23,24) protruding from the edge of the closure flap (3), which in The closed position of the flap (3) is bent at least approximately up to flat contact with the pipe wall (1). 2. Closure flap according to claim 1, characterized in that the elastic disc (23,24) pulls over the entire flap surface and is interrupted at most in places for fastening means (20) is. 3. Closure flap according to claim 1 or 2, characterized in that that the elastic disc (23,24) is seated between two sheet-metal discs (22) from which the closure flap (3) also consists. 4. Closure flap according to one of claims 1 to 3, characterized in that that the closure flap (3) with the elastic disc (23,24) is held centrally in the line cross-section by means of at least one ball bearing (4) between the shaft (2) and a bushing (6,7) seated on the outside of the duct wall (1) in the way is formed that the balls (16) between an annular Paragraph (11) on the inside of the socket (6, 7) and a preferably screwed-in abutment ring seated in the socket (12,13) are guided and engage in an annular groove (15) recessed on the circumference of the shaft (2). 5. Closure flap according to claim 4, characterized in that the said annular shoulder (11) an inclination, from the circumference and from outer end of the socket (6,7) towards the inside, and / or the counter bearing ring (12,13) an abutment surface (12) with a radial inclination, from the circumference and from the inner end of the socket (6,7) inwards, has or have. 6. Closure flap according to claim 4 or 5, characterized in that that said socket (6,7) consists of a line wall (1) penetrating through with a collar (5) on the inside of the line wall (1,9) adjacent inner bushing (6) and a longer one screwed onto this from the outside against the pipe wall (1,9) Outer bushing (7) consists, the outer end of the inner bushing (6) forming said paragraph (11) and the abutment ring (12,13) in Screwed into the outer socket and preferably through a lock nut (14) is secured on the, from the outer sleeve (7) protruding, the end of the abutment ring (13) against the end of the Outer bushing (7) is screwed. 7 · Closure flap according to claim 6, characterized in that the the line wall (1,9) between the clamping surfaces of the said collar (5) and the outer bushing (7,8) enclosing each other approximately are conical and the end face (10) of the inner socket (6) including the collar (5) with the inner surface of the pipe wall (1) roughly aligned. 8. Closure flap according to one of claims 4 to 7, characterized in that that both bearings of the shaft (2) are ball bearings (4) of the type mentioned. 9. Closure flap according to one of claims 1 to 9, characterized in that that the contact of the elastic disc (23) on the pipe wall at a distance next to the passage of the shaft (2) through the pipe wall (1,10) is passed by.