DE3128133C2 - Closure flap for air ducts - Google Patents

Abstract

A closure flap (3) for air lines (1), especially of larger diameter, has an elastic disc (23, 24) protruding from the edge of the closure flap (3), which extends over the entire flap surface and in the closed position of the closure flap (3) to is bent to a flat contact with the pipe wall (1). In order to keep the cross-section of the line dimensionally stable and to keep the flap (3) centered in it, the flap (3) is mounted in two ball bearings (4), each between the shaft (2) and a socket (6 , 7) are formed in such a way that the balls (16) are guided between an annular shoulder (11) on the inside of the socket (6, 7) and an abutment ring (12, 13) screwed into the socket and in an on At the beginning of the shaft (2) grip the recessed annular groove (15).

Description

15 called collar (5) and the Außenbuchsc (7, 8) are approximately conical and the end face (10) of the inner bushing (6) including the collar (5) is approximately aligned with the inner surface of the pipe wall (1)

9. Closure flap according to one of claims 5 to 8, characterized in that both bearings of the WeUe (2) ball bearings (4) of the type mentioned.

10. Closure flap according to one of Anspiüche 1 to 9, characterized in that the system of elastic disc (23) on the pipe wall at a distance next to the passage of the shaft (2) through the Line wall (1,10) is passed

The invention relates to a closure flap for air lines, in particular larger diameter, which at a shaft guided through the pipe wall sits on the pipe wall in bearings of which at least one is formed between the shaft and a socket seated on the outside of the pipe wall

Such a closure flap is known from DE-GM 74 40 323 in the form of a throttle valve that extends up to can be adjusted towards the locking position The flap edge has a cross-section, especially in the case of air lines with a larger diameter small free distance from the pipe wall. The flap cannot therefore close tightly.

From US-PS 31 11 300 a flap valve for water pipes is known, which consists of one between two This valve closes tightly. Its construction can however of the water pipes, which have a much smaller diameter, a thicker wall and a regular have a more precise cross-section, not transferred to air ducts. The rubber plate can be attached to air ducts Do not bridge the cross-sectional deviations that occur or at least not without a lot excessive clamping forces arise.

Smaller clamping forces arise in one from US-PS 29 23 523, also for water pipes, known Valve. Here, a lip is formed on the edge of the valve flap which, in the closed position, is opposite to the Direction of flow is bent and placed against the pipe wall. It is then made except by its elasticity pressed against the pipe wall by the water pressure. When the flap is closed, both halves of the flap are opened the lip, sliding on the valve wall, dragged. At the end the flap is swiveled back a little and so the lip on one half of the valve under a temporary compression on the pipe wall upside down. This construction also requires a very precise line cross-section.

Also known from DE-PS 5 15 501 is a check valve for a concrete pump. It has a flap with a rubber covering around the edge protrudes and is bent in the direction of the concrete delivery and rests against the pipe wall. The pipe wall is designed as a valve seat for the edge of the rubber covering designed so that it simply rests against this seat and is lifted off it again when the valve is opened on the one side where the valve shaft is located, far beyond the right angle is bent.

From GB-PS 5 68 717 it is finally known to mount a valve flap by means of ball bearings.

3 4

The invention is based on the object of a comparison.

Closing flap of the type described at the outset to create other possible leaks like them fen, which closes up to large pipe diameters around the inner circumference of an annular sealing seal and works reliably *, but could also guide a washer around, simple from the start built and easy to assemble. 5 closed.

According to the invention it is provided that the pressure is expediently seated the elastic disc intermediate valve an elastic protruding at its edge see two sheet metal disks that make up the flap Has disc which in the closed position of the Verpe in the rest, d. H. the actual closure flap, decision flap by 90 ° up to the system under bending chip

voltage is bent on the pipe wall that in üen io As an advantageous development of the invention Areas of the shaft the bend from one side is proposed that said at least one changes to the other side of the flap and the bearing is a ball bearing whose balls are between one that the closure flap by means of said minor shoulder on the inside of the socket and at least one bearing centrally in the line cross-section, one seated in the socket, preferably maintained is 15 screwed, the abutment ring are guided and in an am

The specified bend is achieved with an annular groove that has been removed from the circumference of the shaft

the stated purpose: take effect.

It practically represents the greatest possible bending. This construction represents an extremely simple, in particular

namely from the perpendicular to the pipe socket by 90 ° special radial-

in a parallel to the line axis, which is a relative 20 axial bearing, in which the axial bearing is two-sided

moderately large length of the sealing lip thus formed results is

The further embodiment is particularly advantageous processing wall adjacent section is enlarged. of the ball bearing, after which the said annular Ab-So Also larger irregularities of the set become a slope, of the circumference and of the outer end Line cross-section, d. H. Deviations in the line 25 of the socket towards the inside and / or the circumference of the abutment from the circular shape or the otherwise provided ring an abutment surface with radial inclination, from nen shape, safely bridged This is all the more important, the circumference and from the inner end of the bushing the cable cross-section becomes larger. inside, has or have.

At the same time, the bend limits the contact force. Apart from the fact that the slope of the radial-axial

the sealing lip on the pipe wall corresponds to the bending chip 30 storage function, this design enables

and closes the much larger compression forces, an extremely simple assembly: You leave the

which arise with little or no bend only between the shaft and the one above the

hen. The bending stress, on the other hand, is sufficient for a paragraph to collapse and extend the scope of the socket

® sufficient sealing effect. This is also for larger ones then screw in the abutment ring; at the latest then,

Pipe diameter especially important, where in addition to 35 when the abutment ring when screwing onto the

meets the greater length of the line and balls to be sealed, they become radial due to the inclination

The flap circumference is pressed between this and the flap inward into the groove and center it radially

wave effective lever arms become larger. like axially on itself.

This has a very much further in the same sense - particularly simple, cost-saving to manufacture

The main effect when opening the flap, as it is 40 and labor-saving in assembly, is the ball bearing

here the upsetting forces would multiply again in the further embodiment that said bushing

the. from one penetrating the pipe wall, with one

The emergence of larger upsetting forces is when the inside of the öff collar rests on the inside of the pipe wall this prevents that, as a result of the bend to the socket and one on this from the outside against the Leiin an axis parallel, the force overcoming the friction to the 45 transition wall screwed, longer outer bushing has, largely or entirely in the movement, the outer end of the inner bushing the direction forms parallel to the pipe wall or to the bent-over shoulder and the abutment ring into the NEN sealing lip is brought in and engages and screwed there- external bushing and preferably through a with hardly any force component can arise that the lock nut is secured on, from the external friction enlarge and change the bend 50 bushing projecting end of the abutment ring would. the end of the outer socket is screwed.

Finally, in the case of a two-dimensional system, it is finally proposed that the pipe wall to which you will prefer to bend the elastic disc between the clamping surfaces of the, the risk of the sealing lip getting stuck in the lower called collar and the outer bushing approximately koals in the case of the system with an edge. 55 to design niche and the face of the inner sleeve

The fact that the closure flap with the elastic including the collar with the inner surface of the lei disc to have at least one bearing central wall aligned through said at least one bearing. The inner surface of the is kept trically in the line cross-section, the line wall is then practically without discontinuity would take the areas in which the bend of the disk up directly to the passage of the shaft, so be alternated, all around the same bending and contact 60 that the contact of the elastic washer on the conduction conditions of the elastic washer on the conduit wall is not disturbed here either. About it is found wall secured; the disc itself could be more detailed because of below.

its necessary flexibility, the flap An extraordinary advantage, especially with large

do not or at least not securely support centrically. Ben line cross-sections, after all, lies in that

The elastic disc, for example made of silicone 65 shaft on both sides in ball bearings of the said

rubber, chloroprene polymer, etc., attracts deposits.

preferably over the entire flap surface and is thus able, since the ball bearings as axial bearings on both sides

At most, tensile and compressive forces from the pipe wall act interrupted in places for fasteners

be received and held forth in the shaft; becomes the cable diameter falling into the wave Always kept at the intended size even against strong force attacks. This solidifies over this Diameter, the entire cable cross-section on the flap is many times over: the bending length is halved, and there are statically two arcs supported on the shaft. This is especially important for Pressure surges and the fall of negative pressure in the air line. Such influences can cause lines larger diameter - diameters above the highest standard size of 65 cm are also possible here - can be indented in slightly out-of-round places.

For the elastic disk it is finally suggested that their contact with the pipe wall at a distance next to the passage of the wave through the pipe wall or through the one here forming the pipe wall Pass the socket and for this purpose the flap at a small distance from the axis of rotation on the To attach the shaft. So far it has always been overlooked that a closure flap sitting on the shaft axis through the annular gap of the shaft passage and the bearing from a small air flow can be circumvented.

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 again.

F i g. 1 shows, somewhat simplified, a section through a closure flap of an air line, axially to the air line and at right angles to the flap shaft;
F i g. 2 shows a section along line H-II in FIG. 1; F i g. 3 shows the in FIG. 2 framed detail II on a larger scale.

In an air line 1 sits in the middle of the line cross-section arranged shaft 2 a flap 3. The air line can be attached to the flap from a special Housing exist. The flap can also be used in a normal line cross-section. The line cross-section is circular, but the flap can also be adapted to other types, such as rectangular, Cross-sections possible.

The shaft 2 is in two ball bearings 4 seated on the outside of the air line 1 from the following F i g. 3 visible structure stored:

One with a frustoconical collar 5 reaching through a hole under the pipe wall Inner bush 6 is provided with an external thread and with an external bush consisting of a nut 7 screwed, which with a counter surface 8 to the collar 5, the edge 9 of the line wall at the bore when screwing on the collar 5 has bulged and in the assembled state full of the collar 5 and the mating surface 8 is clamped in contact with it. The lower end face 10 of the inner bushing essentially fits together seamlessly and steplessly on the inside of the pipe wall.

The outer sleeve 7 protrudes above the inner sleeve 6 so that its, slightly inwardly inclined, upper end face therein a paragraph 11 forms In the upper, protruding Part of the outer bushing 12 is provided with an inclined abutment surface 12 on its underside Screwed ring 13 This protrudes beyond the outer sleeve 7 and is secured by a lock nut 14 screwed on here secured

The shaft 2 passing through the parts 5 to 14 points between the shoulder 11 and the abutment surface 12

10

15th

20th

25th

30th

35

50

60 has a groove 15. 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 one lever 18 is shown in the drawing.

The flap 3 is centrally adjusted and clamped on the shaft 2 after its assembly by means of on the Shaft 2 slidable rider 19, which penetrate the flap 3 with short threaded bolts 20 and by means of the other side of the flap on this screwed nuts 21.

The flap consists in detail of two sheet metal disks 22 and an elastic one clamped between them Disk 23, e.g. B. made of silicone rubber. The elastic disk 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 against the pipe wall. The edge of the sheet metal disks 22 has such a wall from the inner circumference of the line wall 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 in a pronounced arc 25 and then with a section 26 flat on the Line wall is in contact

Only in the area of the shaft 2, where the bend of the sealing lip 24 from one side to the other The side of the flap 3 changes, the sealing lip 24 becomes narrower, except for a little more than the free one Distance between the edge of the sheet metal disks 22 and the line wall 1 at the narrowest point. Is in F i g. 2 can be seen at 27, in FIG. 3 but not shown compressions of the sealing lip act at this point However, it does not affect the ability of the valve to work, as the opposing forces generated only with be effective with a minimal lever arm.

For this purpose 3 sheets of drawings

Claims (7)

Patent claims: 1. Closure flap for air lines, especially larger diameter, which is attached to a through the Line wall (1) guided shaft sits, which is held on the line wall in bearings (4), of which at least one bushing (6) located between the shaft (2) and an outside on the pipe wall (1), 7) is formed, characterized in that the closure flap (3) has one at its edge protruding elastic disc (23, 24) which in the closed position of the closure flap (3) around 90 ° to the plant under bending stress on the line wall (1) is bent that in the areas of the shaft (2) the bend changes from one side to the other side of the closure flap and that the closure flap (3) by means of said at least one bearing centrally in the line cross-section is held 2. Device according to claim 1, characterized in that that the elastic disc (23, 24) in the closed position of the closure flap (3) is up to two-dimensional System on the pipe wall (1) is bent 3. Closure flap according to claim 1 or 2, characterized in that the elastic disc (23,24) pulls over the entire flap surface and at most in places for fasteners (20) is interrupted 4. Closure flap according to one of claims 1 to 3, characterized in that the elastic Disk (23, 24) sits between two sheet metal disks (22), from which the shutter (3) otherwise consists 5. Closure flap according to one of claims 1 to 4, characterized in that said at least one bearing is a ball bearing, the balls (16) of which between an annular shoulder (11) on the inside of the socket (6, 7) and one seated in the socket, preferably screwed in, Abutment ring (12,13) are guided and in an annular recess on the circumference of the shaft (2) Grip the groove (15). 6. Closure flap according to claim 5, characterized in that said annular shoulder (11) an inclination from the circumference and from the outer end of the socket (6,7) inwards, and / or the Abutment ring (12, 13) an abutment surface (12) with radial inclination, from the circumference and from the inside End of the socket (6,7) towards the inside, has or have. 7. Closure flap according to claim 5 or 6, characterized in that said bushing (6, 7) from a pipe wall (1) penetrating with a collar (5) on the inside of the pipe wall (1,9) adjacent inner socket (6) and one screwed onto this from the outside against the pipe wall (1,9), longer outer bushing (7), the outer end of the inner bushing (6) said paragraph (11) and the abutment ring (12,13) in the Outer bush is screwed and preferably secured by a lock nut (14) on the, from the outer sleeve (7) protruding end of the abutment ring (13) against the end of the outer sleeve (7) is screwed 6. Closure flap according to claim 7, characterized in that the line wall (1, 9) between enclosing clamping surfaces of the 10