DE19629459A1 - Connection fitting for plastics pipe - Google Patents

Abstract

The connection fitting has a valve insert (14) in a casing (9), with a closing body (15) and a hollow cylindrical cutting head (17) to make a connecting aperture (23) in the pipe and with an outlet connection (10) for an outlet line (11). The closing body and the cutting head can be separated from each other by a coupling body (18). After the connecting aperture (23) has been made, the coupling body is destroyed as the valve insert is turned back. The connection between the closing body and the cutting head is released. The cutting head stays in the pipe (1) to form a seal seat (41) in the connecting aperture for the closing body.

Description

The invention relates to a connection fitting for art fabric tubes according to the features in the preamble of the An saying 1.

Such fittings are one example DE 38 30 395 C1 or DE 37 04 321 C2 on the stand of the technique. The connection fittings have a valve fitting, in which a valve insert is displaced vertically bar is arranged. The valve port is essentially arranged perpendicular to the longitudinal axis of the tube.

The valve insert includes a cutting head for manufacture development of a connection opening in the plastic tube. In which Cutting head is usually a milling machine ser. Furthermore, the valve insert is a closing body assigned, with the help of the connection opening in Plastic pipe can be sealed. Right Angle To  Valve nozzle is an outlet nozzle attached to wel Chen an outgoing line can be connected.

These designs enable the drilling of pipes under pressure without using additional tapping tools ten. A disadvantage of the known connection fittings however, their great height. This is because of that conditional that the ver in the connection opening lowered cutting head after drilling over a sealing seat must be moved back so that an unhindered through flow is guaranteed. Despite the long way at However, it can be opened and closed partially do not prevent the cutting head in the flowed area remains. The cutting head poses then an obstacle in the outflow cross-section.

Another possibility is described in DE 29 39 845 A1. There the cutting head is not a hollow or capsule cutter executed, but as a double-edged ironing boring tool. This design allows flow around of the tapping tool when it is in the drill hole. This enables a shorter design, however the flow cross section is disadvantageously narrowed.

In addition to the problems described above, art fabric tubes when using clamped connection fittings in the area of tapping over time give way and deform. Then it can Gaps between the connection fitting and the plastic open the tube, even with a given flexi gasket can no longer be caught.

The invention is based on the prior art Task based on a connection fitting for plastic to further develop pipes in function and application, so that  a reduction in the overall height and the tightness the connection is improved.

According to the invention, this object is achieved in those listed in the characterizing part of claim 1 Characteristics.

The heart of the invention is the measure, a Ven insert with a closing body and a Cutting head that separable from each other in a separable manner arranges that the cutting head after drilling the Plastic pipe in the connection opening fixed ver remains. Here the cutting head forms a sealing seat for the closing body.

To open or shut off the connection fitting only the valve insert with its closing body moved down. Since the cutting head no longer has the Seal seat must be raised, the height of it connection fitting according to the invention much shorter be placed.

In addition, the tightness of the connection fitting is also guaranteed over a long period of time because the cutting head fixed in position in the connection opening Function as a support sleeve. A yielding or a deformation of the plastic tube in the area of the closing opening is avoided. Even if it becomes one age-related change in the plastic pipe should the connection remain tight.

The coupling of the closing body and the cutting head can done non-positively and / or positively. It is conceivable for for example, a spring-loaded arrangement, which at Er reach the lower layer of the valve insert irreversibly is solved.  

Also the connection of the closing body and the cutting head by a thread, which is designed so is that the connection is on when the valve is turned back set from the lower layer is released.

A further developing the general idea of the invention Embodiment is in the features of claim 2 see.

Then the closing body and the cutting head are through a coupling body connected to each other, both from Closing body and separable from the cutting head.

The coupling body expediently consists of plastic and engages in appropriately designed mounting grooves of the closing body and the cutting head this. After reaching the lower position of the valve set or when turning back the valve insert together The coupling body is destroyed with the closing head and the connection between the closing body and the cutting head resolved irreversibly. The detached coupling body can be on then be rinsed out via the outlet connection.

According to the features of claim 3, the cutting head an abutment section on its outer jacket. Of the Abutment section serves to securely fix the Cutting head in the plastic tube.

Even if fundamentally different training of the Abutment section are conceivable to fix the position Achieving this is particularly advantageous in practice see the abutment section formed by a self-tapping thread. This cuts into the opening when making the connection Plastic pipe and clamps there self-locking.  

For a firm connection of the cutting head to the housing The valve stub is to be guaranteed according to the characteristics len of claim 4 provided that the cutting head External thread for screwing into a threaded section of the Has valve stub. In this way a verver casual connection of the cutting head with the valve socket reached.

The cutting head is expediently opposite the Ven partial nozzle sealed by at least one sealing ring, as provided for in claim 5.

Another advantageous training is in the features characterized of claim 6. After that is the through and tapered opening in the cutting head extends upwards. The cut pipe section as well as chips generated during drilling can be done in this way be easily rinsed out. Fixing the bored out Pipe section in the cutting head is prevented.

Another appropriate further education of the general Er inventive idea is in the features of claim 7 see after which the closing body one drilled out Pipe section locking pin is assigned. The thorn has a self-tapping thread and is drill the plastic pipe into the ones to be cut out Pipe section screwed in. When retracting the clasp body from its lower layer can then the Rohrab cut out of the cutting head using the mandrel be drawn. Then the mandrel is removed from the closing body by loosened and together with the drilled pipe cut rinsed over the outlet nozzle.

An appropriate design of the hollow cylindrical Cutting head is characterized in claim 8. After that  the drill head is designed as a capsule cutter and has at least one cutting tooth on its face.

Another alternative for a cutting head is counter state of claim 9. In this embodiment, the Cutting head designed as a punching tool, which has a cutting edge on the front.

The invention is based on in the drawings gene described embodiments described in more detail ben. Show it:

Fig. 1 to 6 a connection fitting according to the invention in different assembly or working positions;

Fig. 7 is a vertical cross-section through the cutting head;

Fig. 8 shows another embodiment of a connection fitting;

Fig. 9, the connection fitting of FIG. 8 in the flushing process from the cut Rohrab section and

Fig. 10 in an enlarged representation of the detail X of Fig. 8.

With 1 in Figs. 1 to 6, a pipeline made of Po lyvinyl chloride. In order to create an outlet to a consumer from this pipeline 1 , a connection fitting 2 is placed on the pipeline 1 and fastened tightly. The connection fitting 2 comprises an upper part 3 and a lower part 4th Upper part 3 and lower part 4 are shell-shaped and provided with side flanges 5 , 6 for inserting screw bolts 7 . With the help of the bolts 7 upper part 3 and Un lower part 4 can be braced against each other. Here, a seal set 8 is inserted between the pipe 1 and connection fitting 2 or upper part 3 and lower part 4 .

The upper part 3 is provided with a one-piece vertical valve stub 9 . To the side of the valve nozzle 9 , an outlet nozzle 10 goes off. A line 11 (see FIGS. 5 and 6) to a consumer can be connected to this.

At the valve port 9 , an upper valve part 12 is added, in which a spindle 13 is mounted. Actuate the spindle by the supply 13 may be a verlager bar arranged in the valve stub 9 valve insert 14 to lock and be moved upwards be. Figs. 1 and 5 show the Ven tileinsatz 14 in its upper position O, the valve core 14 whereas in the Fig. 2 and is shown in its lower position U 6.

The valve insert 14 has a closing body 15 with an attached ring seal 16 . A valve head 17 is assigned to the valve insert 14 or the closing body 15 so that it can be separated. The connection of the closing body 15 and the cutting head 17 is provided by a coupling body 18 . The coupling body 18 is a molded plastic part. This is bowl-shaped. With an upper annular bead 19 , it engages around the closing body by 15 . The coupling to the cutting head 17 takes place essentially via a groove 20 undercut on the major part of its circumference (see also FIG. 7), in which the coupling body 18 claws. In order to promote the lifting of the coupling body 18 from the groove 20 , a lifting section 20 'is provided in the groove 20 .

The cutting head 17 is designed as a capsule cutter and has 21 cutting teeth 22 on its end face.

After the connection fitting 2 is firmly attached to the pipeline 1 , the valve insert 14 is moved downward by means of the spindle 13 to produce a connection opening 23 in the pipeline 1 . Here, the cutting head 17 mills a pipe section 24 from the pipe 1 (see FIG. 2). The milled pipe section 24 and chips 25 are pressed into the conically enlarged region 26 of the cutting head 17 by the internal pressure P in the pipeline 1 .

As can be seen in particular in FIG. 7, the cutting head 17 has on its outer jacket 27 a section 29 provided with a self-tapping thread 28 . The thread 28 cuts into the pipeline 1 during the production of the connection opening 23 and interlocks the cutting head 17 with the pipeline 1 .

Furthermore, the cutting head 17 has an external thread 30 . This is screwed during the downward movement of the cutting head 17 in a threaded portion 31 of the valve neck 9 . This ensures a firm connection of the cutting head 17 to the valve stub 9 when the lower position U of the valve insert 14 is reached.

Above the external thread 30 is a smooth-walled shoulder 32 . Here there is a ring seal device 33 . This arrives at a step 34 in the valve stub 9 when the cutting head 17 has reached its end position and seals the two components against one another.

Not shown in FIG. 7, but possible, is the arrangement of further seals in the step section 35 or in the smooth-walled section 36 of the cutting head 17 .

After the valve insert 14 has reached its lower position U, the connection opening 23 has been made and the cutting head 17 is fixed in position, the valve insert 14 is moved upwards with the closing body 15 from the lower position U into the upper position O. With this movement, the Kop pelkörper 18 is destroyed, as shown in FIGS . 3 and 4 gene. The coupling body 18 and the milled Rohrab section 24 and the chips 25 can then be rinsed out through the outlet nozzle 10 .

Then the line 11 is connected to a connection 37 in the outlet connector 10 .

In FIG. 5, the open position of the connection fitting 2 is illustrated, 6 whereas Fig. Betriebstechni the specific closing position of the terminal fitting 2 shows.

The cutting body 17 is fixed in position in the pipeline 1 and in the valve connecting piece 9 . On its inside 39 in the area 40 facing the closing body 15 , the cutting body 17 has a section 42 formed as a sealing seat 41 . The sealing seat 41 defines the closed position of the closing body 15 in the lower position U.

From Fig. 7 it can also be seen that the passage opening 43 in the cutting head 17 widens slightly conically upwards, so that the milled pipe section 24 and the chips 25 can be washed out more easily.

From FIGS. 8 and 9, another embodiment is a connection fitting projecting 44, of which only the upper part 45 is shown here.

The connection fitting 44 is fixed in a known manner under an outline of a seal 46 on a plastic tube 47 . An annular bead seal 49 is arranged around the connection opening 48 to be produced . Furthermore, the valve connector 50 with the upper part 51 , valve insert 52 , spindle 53 and outlet connector 54 can be seen . The displacement of the valve insert 52 in the valve socket 50 is accomplished by the spindle 53 , the sleeve 55 of the valve insert 52 with its threaded portion 56 being supported on the internal thread 57 of the upper part 51 .

The valve insert 52 comprises a closing body 58 and a cutting head 59 , which are assigned to one another in a separable manner. For this purpose, the closing body 58 and the cutting body are connected by 59 through the sections 62 , 63 provided with threads 60 , 61 .

An annular seal 64 is assigned to the closing body 58 . This interacts with the sealing seat 66 formed by the conical section 65 of the cutting head 59 .

The cutting head 59 is designed as a punching tool with an end punch 67 (see FIG. 10). The cutting body 59 is provided with abutting pointed grooves 69 on its outer jacket 68 .

Furthermore, the cutting body 59 has an external thread 70 , which can be screwed into a threaded portion 71 of the valve stem 50 .

A mandrel 72 with a self-tapping thread 73 is assigned to the closing body 58 . The mandrel 72 is received with its mandrel head 83 by a bush 74 and is supported against a bolt 77 by a spring 76 arranged in a central bore 75 of the closing body 58 .

To produce the connection opening 48 in the plastic tube 47 , the valve insert 52 with the closing body 58 and cutting head 59 is moved downward. The cutting head 58 separates a pipe section 78 out of the plastic pipe 47 . At the same time, the mandrel 72 bores into the tube section 78 .

After reaching the end position, the cutting head 58 is clawed in the plastic tube 47 with its abutment section 79 and fixed in position in the valve stub 50 by the threads 70 , 71 . To seal an additional ring seal device 80 is provided.

After the cutting head is fixed in position, the valve insert 52 is moved upward. The closing body is separated by 58 from the cutting body 59 . The pitch of the threads 60 , 61 is accordingly designed so that a safe separation is possible. At the same time, the mandrel 72 pulls the cut tube section 78 out of the connection opening 48 .

When the upper position O 1 of the valve insert 52 is reached, the bolt 77 is pressed down by the head 81 of the spindle rod 82 against the spring 76 and the mandrel head 83 is pushed out of the bushing 74 . This separates the mandrel 72 together with the tube section 78 from the closing body by 58 and can be rinsed out.

The connection fitting 44 is now ready for use. To block the connection opening 48 , the valve insert 52 can be moved into the closed position U 1 by actuating the spindle 53 , the seal 64 coming into contact with the sealing seat 66 . A reliable shut-off of the connection fitting 44 is thus ensured.

The cutting head 59 remaining in the connection opening 48 takes on not only its sealing seat function but also a support function and stabilizes the transition region 84 of the valve stub 50 and the plastic tube 47 .

Reference list

1 pipe
2 connection fittings
3 top
4 lower part
5 flange
6 flange
7 bolts
8 sealing seat
9 valve spigot
10 outlet connections
11 line
12 valve bonnet
13 spindle
14 valve insert
15 closing bodies
16 ring seal
17 cutting head
18 coupling body
19 ring bead
20 groove
20 ′ excavation section
21 end face
22 cutting teeth
23 connection opening
24 pipe section
25 chips
26 area
27 outer sheath v. 17th
28 threads
29 Section v. 17th
30 male thread v. 17th
31 threaded section
32 shoulder
33 ring seal
34 level
35 step section
36 section
37 connection
38 sealing seat
39 inside v. 17th
40 area v. 17th
41 sealing seat
42 section
43 through opening
44 connecting pipe
45 top
46 seal
47 plastic tube
48 connection opening
49 Ring bead seal
50 valve sockets
51 top
52 valve insert
53 spindle
54 outlet spigot
55 sleeve
56 threaded section
57 thread from 51
58 closing body
59 cutting head
60 threads
61 threads
62 section
63 section
64 seal
65 conical section in 58
66 sealing seat
67 cutting edge
68 outer sheath v. 59
69 pointed groove
70 external threads
71 threaded section
72 thorn
73 threads
74 socket
75 hole
76 spring
77 bolts
78 pipe section
79 abutment section
80 ring seal
81 head of 82
82 spindle rod
83 Dornkopf
84 transition area
D internal pressure
O top layer from 14
O₁ top layer v. 52
P internal pressure
U lower layer of 16
U₁ lower layer v. 52

Claims (9)

1. Connection fitting, which can be fixed to a liquid-carrying plastic tube ( 1 , 47 ), with a valve stub ( 9 , 50 ) for a valve insert ( 14 , 52 ) arranged therein, comprising a closing body ( 15 , 58 ) and one Hollow cylindrical drilled cutting head ( 17 , 59 ) for the manufacture of a connection opening ( 23 , 48 ) in the plastic tube ( 1 , 47 ) and with an outlet connection ( 10 , 54 ) for connecting an outlet line ( 11 ), characterized in that the closing body ( 15 , 58 ) and the cutting head ( 17 , 59 ) are separably assigned to one another and the cutting head ( 17 , 59 ) has a sealing seat ( 41 , 41 ) fixed in position in the connection opening ( 23 , 48 ) after the plastic pipe ( 1 , 47 ) has been drilled. 66 ) for the closing body ( 15 , 58 ). 2. Connection fitting according to claim 1, characterized in that the closing body ( 15 ) and the cutting head ( 17 ) are connected to one another by a coupling body ( 18 ) which can be separated both from the closing body ( 15 ) and from the cutting head ( 17 ). 3. Connection fitting according to claim 1 or 2, characterized in that the cutting head ( 17 , 59 ) on its outer casing ( 27 , 68 ) with a plastic tube ( 1 , 47 ) cooperating abutment section ( 29 , 79 ). 4. Connection fitting according to one of claims 1 to 3, characterized in that the cutting head ( 17 , 59 ) has an external thread ( 30 , 70 ) for screwing into a threaded portion ( 31 , 71 ) of the Ven tilstutzens ( 9 , 50 ). 5. Connection fitting according to one of claims 1 to 4, characterized in that between the cutting head's ( 17 , 59 ) and valve stub ( 9 , 50 ) at least one seal ( 33 , 80 ) is provided. 6. Connection fitting according to one of claims 1 to 5, characterized in that the cutting head ( 17 ) has an upwardly conically extending passage opening ( 43 ). 7. Connection fitting according to one of claims 1 to 6, characterized in that the closing body ( 58 ) a cut the Rohrab cut ( 78 ) locking mandrel ( 72 ) is assigned. 8. Connection fitting according to one of claims 1 to 7, characterized in that the cutting head ( 17 ) is designed as a capsule cutter and on its end face ( 21 ) has at least one cutting tooth ( 22 ). 9. Connection fitting according to one of claims 1 to 7, characterized in that the cutting head ( 59 ) is designed as a punching tool with an end-side punch ( 67 ).