Connection device

Abstract

A connection device for connecting a main pipe (1) to a secondary pipe (2). The connection device includes a substantially cylindrical connection piece (3), able to be inserted, preferably able to be screwed, into a wall opening of the main pipe (1), for connection of the secondary pipe (2), wherein for sealing the connection piece (3) a preferably ring-shaped sealing element (4) is provided, lying against the main pipe (1), which sealing element is connected directly or via mechanical connecting elements to an outer circumference of the connection piece (3).

Claims

1. A connection device for connecting a main pipe (1) to a secondary pipe (2), comprising a substantially cylindrical connection piece (3) shaped to be inserted and screwed into a wall opening of the main pipe (1), for connection of the secondary pipe (2), wherein for sealing the connection piece (3) a ring-shaped sealing element (4) is provided, lying against the main pipe (1), which sealing element is connected directly or via mechanical connecting elements to an outer circumference of the connection piece (3), wherein the sealing element (4) comprises, on an inner circumference, a projection (7) abutted to a shoulder (8) on the outer circumference of the connection piece (3), so that the sealing element (4) on inserting and screwing of the connection piece (3) into the wall opening of the main pipe (1) is pressed against an inner wall of the main pipe (1); wherein the sealing element (4) has a first sealing surface (5), formed onto an inner surface of the main pipe, and a second, ring-shaped sealing surface (6), wherein in a mounted state, the first sealing surface (5) lies against the inner wall of the main pipe (1) and the second sealing surface (6) lies against the outer circumference of the connection piece (3); and wherein a first sealing ring (9) is arranged in a groove of the first sealing surface (5), and a second sealing ring (10) is arranged in a groove of the second sealing surface (6).

2. The connection device according to claim 1, wherein the sealing element (4) lies against the inner wall of the main pipe (1) in a region of the wall opening.

3. The connection device according to claim 1, wherein an outer diameter of the sealing element (4) is greater than a diameter of the wall opening of the main pipe (1).

Description

BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE INVENTION

(1) FIG. 1 shows a cross-sectional view of a connection device known from the prior art;

(2) FIG. 2 shows a cross-sectional view of an embodiment of a connection device according to the invention;

(3) FIG. 3 shows a cross-sectional view of a further embodiment of a connection device according to the invention;

(4) FIG. 4 shows a cross-sectional view of a further embodiment of a connection device according to the invention;

(5) FIG. 5 shows a cross-sectional view of a further embodiment of a connection device according to the invention;

(6) FIG. 6 shows a cross-sectional view of a further embodiment of a connection device according to the invention;

(7) FIGS. 7a and 7b show cross-sectional views of a further embodiment of a connection device according to the invention;

(8) FIG. 8 shows a cross-sectional view of a further embodiment of a connection device according to the invention;

(9) FIG. 9 shows a cross-sectional view of a further embodiment of a connection device according to the invention;

(10) FIG. 10 shows a cross-sectional view of a further embodiment of a connection device according to the invention;

(11) FIG. 11 shows a cross-sectional view of a further embodiment of a connection device according to the invention;

(12) FIG. 12 shows a cross-sectional view of a further embodiment of a connection device according to the invention;

(13) FIG. 13 shows a cross-sectional view of a further embodiment of a connection device according to the invention.

DESCRIPTION OF SPECIFIC EMBODIMENTS OF THE INVENTION

(14) The invention is explained in further detail below with the aid of non-exclusive example embodiments. All the figures show a cross-section through a main pipe 1, to which a secondary pipe 2 is connected by one of the embodiments according to the invention, wherein the cross-section is made along the symmetry axis of the secondary pipe.

(15) FIG. 1 shows a connection device, known from the prior art, for mounting a secondary pipe 2 onto a main pipe 1, wherein the secondary pipe 2 is sealed in the interior of the main pipe by rolling-on of a sleeve.

(16) FIG. 2 shows an embodiment of a connection device according to the invention. The connection device comprises a cylindrical connection piece 3 which is screwed into a wall opening of a main pipe 1 via a diagrammatically illustrated threaded connection. In an alternative embodiment, which is not illustrated, to reduce the stress of the pipe, no thread is provided in the main pipe 1, but rather the connection piece 3 is fixed on the outer side via a counter-nut. For sealing the connection piece 3, a ring-shaped sealing element 4 is provided, lying against the main pipe 1, the outer diameter of which sealing element is greater than the diameter of the wall opening. The sealing element 4 has a first sealing surface 5, which is adapted to the shape of the inner wall of the main pipe 1. In this first sealing surface 5, a first sealing ring 9 is arranged in a groove. Furthermore, the sealing element 4 has a second ring-shaped sealing surface 6, which is in contact with an outer circumference of the connection piece 3. In the second sealing surface 6, a second sealing ring 10 is likewise arranged in a groove. The first sealing surface 5 and the second sealing surface 6 are arranged in accordance with the pipe circumference conditions, illustrated by way of example, at an angle of approximately 80° to one another.

(17) The sealing element 4 comprises on its inner circumference a ring-shaped projection 7, which cooperates in a form-fitting manner with a likewise ring-shaped shoulder 8 on the outer circumference of the connection piece 3.

(18) It is thereby achieved that on screwing-in of the connection piece 3 into the wall opening of the main pipe 1, the sealing element 4 is pressed via the shoulder 8 and the projection 7 against the inner wall of the main pipe 1, so that the desired pressing of the sealing element 4 or respectively of the two sealing rings 9, 10 is achieved.

(19) The connection piece 3 is divided substantially into three regions, namely initially a first region, which in the mounted state lies in the interior of the main pipe 1 and has the radially projecting, circumferential shoulder 8 for form-fitting connection with the sealing element 4. Adjoining thereto, a second region is provided, which carries an external thread for screwing the connection piece 3 into the wall opening of the main pipe 1. Finally, at the other end of the connection piece 3, a third region is provided, which serves for connection of the secondary pipe 2. For this purpose, the connection device has a substantially cylindrical fitting housing 12, which can be placed onto the third region of the connection piece 3.

(20) The fitting housing 12 has a first opening for receiving the connection piece 3, wherein plug-in connecting means are provided, in order to enable a simple plug-in connection. The plug-in connecting means are embodied in the present example embodiment as snap ring 11, which is arranged in a circumferential groove 15 on the outer circumference of the connection piece 3, and is embodied for engagement into a circumferential groove on the inner circumference of the fitting housing 12. In addition, two sealing rings 16 are arranged between the inner circumference of the fitting housing 12 and the outer circumference of the connection piece 3.

(21) The fitting housing 12 has a second opening for receiving the secondary pipe 2. In the region of the second opening, a circumferential sealing chamber 17 is provided, which comprises a security against extraction for the secondary pipe 2. In the present example embodiment, the security against extraction is embodied in the form of a laterally displaceable clamp 18 with a tapered outer surface.

(22) The clamp cooperates on its outer surface with a correspondingly conically shaped inner surface of the sealing chamber 17, so that on drawing back of the secondary pipe the security against traction is activated and counteracts a further pulling movement of the secondary pipe by clamping of the clamp 18. Furthermore, a sealing ring 19 is provided in the interior of the sealing chamber 17.

(23) On the inner circumference of the fitting housing 12, a first circumferential shoulder 13 and a second circumferential shoulder 14 are provided, which serve as a stop for the introduction of the connection piece and of the secondary pipe 2.

(24) Thereby, it is ensured that these elements are not introduced too deeply into the fitting housing. Furthermore, a mounting display 20 is provided in the interior of the fitting housing 12, which visually displays the introducing of the connection piece 3.

(25) FIG. 3 shows a further embodiment of a connection device according to the invention. In this embodiment, the sealing element 4 is embodied as a barrel-type bearing seal, which lies on its outer, curved circumference against the face surface 21 of the wall opening of the main pipe 1. On its inner circumference, the sealing element 4 is in engagement in a form-fitting manner via a connecting ring 22 with the connection piece 3. The secondary pipe 2 is inserted into a face-side annular groove of the connection piece 3.

(26) FIG. 4 shows a further embodiment of a connection device according to the invention. In this embodiment, the sealing takes place by a sealing element 4 which is arranged on the outer side of the main pipe 1. The sealing element 4 is screwed with the connection piece 3. In order to fix the connection piece 3 in the wall opening, a ring-shaped plug-in hook 23 is provided, which fixes the arrangement and assists the pressing of the sealing element. The secondary pipe 2 is inserted into the connection piece.

(27) FIG. 5 shows a further embodiment of a connection device according to the invention. In this embodiment, the sealing takes place by the sealing element 4 being embodied as a ring-shaped weld element. The ring-shaped weld element has a shoulder and is inserted into the connection piece, which is embodied as a weld fitting.

(28) On mounting, the elements are welded into one another, wherein a separate support bush 23 is provided for stabilizing the secondary pipe 2 in the connection piece 3.

(29) FIG. 6 shows a further embodiment of a connection device according to the invention. In this embodiment, the sealing takes place via an internal, ring-shaped sealing element 4, which by tightening of a screw clamp 24, screwed onto an inserted stop 25, is pressed together and against the inner surface of the main pipe 1. The ring-shaped stop 25, which is partially provided with a thread, gives the sealing element 4 a stable hold and permits the centred introduction of the connection piece 3.

(30) The screw clamp 24 is in form-fitting connection with the connection piece 3 via a connecting ring 26. The stop 25 must be inserted from the exterior into the wall opening.

(31) FIG. 7a shows a further embodiment of a connection device according to the invention. In this embodiment, the sealing element 4 is embodied as a sealing jacket covering the inner circumference of the pipe in a partial portion. The connecting of the sealing jacket to the connection piece 3 takes place via an insert piece. FIG. 7b shows a further variant of this embodiment, in which the sealing element 4 extends through the opening of the main pipe 1 in a radial direction outwards and is only connected there to the connection piece 3.

(32) FIG. 8 shows a further embodiment of a connection device according to the invention. In this embodiment, the sealing element 4 comprises an inserted thrust protection in the form of a sheet metal part 27. The latter counteracts a buckling of the sealing element 4, so that the sealing element 4 is not reduced in its longitudinal extent. The connection piece 3 comprises a screwed-on clamping nut 28 and a wedge-shaped clamping disc 29. The sealing element 4 is arranged in the region of the face surface of the wall opening and projects into the interior of the main pipe. The clamping disc 29 is in angled contact with the sealing element 4, so that on actuating of the clamping nut 28 the clamping disc 29 presses the sealing element 4 outwards.

(33) Owing to the inserted thrust protection 27, the sealing element 4 cannot be shortened, but rather bends upwards, so that the desired sealing effect is achieved. On the other side of the wall opening, a stop is provided on the connection piece 3, which stop counteracts a shifting aside of the sealing element 4.

(34) FIG. 9 shows a further embodiment of a connection device according to the invention. In this embodiment, the sealing element 4 is embodied as a sealing clamp which is fixed by sealing foam 30 in its position in the wall opening of the main pipe 1.

(35) FIG. 10 shows a further embodiment of a connection device according to the invention. In this embodiment, the sealing element 4 lies both against the inner surface of the main pipe 1 and also against the face surface of the wall opening.

(36) In order to connect the sealing element 4 to the connection piece 3 and to the main pipe 1, connecting pins 31 are provided, which are driven out from the interior of the connection piece 3 into the main pipe 1.

(37) FIG. 11 shows a further embodiment of a connection device according to the invention. In this embodiment, the sealing to the main pipe 1 takes place by a tubular sealing element 4, which is chambered by a clamping disc 32 and a stop 33 of the connection piece 3. A clamping nut is 28 is arranged on the connection piece 3, so that on tightening of the clamping nut 28 the sealing element 4 is clamped and pressed against the main pipe 1, so that the desired sealing effect occurs.

(38) FIG. 12 shows a further embodiment of a connection device according to the invention. In this embodiment, the sealing takes place on the face side of the wall opening by means of a seal and a sealing element 4 embodied as a conical clamp. The system is fixed onto the connection piece 3 by means of the conical clamp by screwing of a tapered ring 34. Here, the seal is pressed against a stop 35 of the connection piece 3, so that the desired sealing effect occurs. Particularly advantageously, this embodiment can also be mounted exclusively from the exterior.

(39) FIG. 13 shows a further embodiment of a connection device according to the invention. In this embodiment, the sealing to the main pipe 1 takes place via a sealing element 4, which is chambered by an inner sealing clamp 36 with an inner stop 36′ and by an outer sealing clamp 37 with an outer stop 37′, and is pressed against the face side of the wall opening of the main pipe 1. The connection piece 3 is connected with the inner sealing clamp 36 via a connecting ring 38 arranged in two opposite grooves.

LIST OF REFERENCE NUMBERS

(40) 1 main pipe

(41) 2 secondary pipe

(42) 3 connection piece

(43) 4 sealing element

(44) 5 first sealing surface

(45) 6 second sealing surface

(46) 7 projection

(47) 8 shoulder

(48) 9 first sealing ring

(49) 10 second sealing ring

(50) 11 snap ring

(51) 12 fitting housing

(52) 13 first shoulder

(53) 14 second shoulder

(54) 15 groove

(55) 16 sealing ring

(56) 17 sealing chamber

(57) 18 clamp

(58) 19 sealing ring

(59) 20 mounting display

(60) 21 face surface of the wall opening

(61) 22 connecting ring

(62) 23 plug-in hook

(63) 24 screw clamp

(64) 25 stop

(65) 26 connecting ring

(66) 27 sheet metal part

(67) 28 clamping nut

(68) 29 wedge clamping disc

(69) 30 sealing foam

(70) 31 connecting pin

(71) 32 clamping disc

(72) 33 stop

(73) 34 tapered clamp

(74) 35 stop

(75) 36 sealing clamp

(76) 36′ inner stop

(77) 37 outer sealing clamp

(78) 37′ outer stop

(79) 38 connecting ring