DE9001082U1 - Blowing adapter - Google Patents

Description

The essence of the invention is a device by means of which compressed air can be fed into a cable duct without escaping into the open at the cable inlet, even though there is no adjacent seal between the cable and the housing.

The seal is achieved by having several ring-shaped chambers surrounding the cable. When pressure builds up in the housing, pressure also builds up in the chambers, but this pressure decreases in each chamber so that there is no longer any excess pressure at the entrance to the cable entry.

This pressure reduction is supported by the cable moving against the direction of pressure reduction. The compressed air in the ring chambers simultaneously provides ring-shaped support for the cable, which enables contact-free sliding.

The pressure reduction in the direction of the cable entry is also strongly influenced by the design of the interior of the housing and the outer contour of the sealing insert, which form a type of injector. The effect of the injector creates a pressure at the point where the cable leaves the sealing insert, which counteracts the flow of escaping air.

In order to give the cable good sliding properties in the blowing adapter and also during further installation, it is moistened with a lubricant. This takes place as it passes through the sealing insert, where the lubricant is fed through a radial bore with an internal thread.

The blowing adapter must be able to accommodate the endless cable and be removed from it again. For this reason, it is split lengthwise into two halves. It has a seal in the cut surfaces, which is either designed as an inserted seal or as a stepped surface offset.

These two halves are held together by a slotted ring with a conical inner contour, against which a slotted nut is screwed. This design is possible for both ends; however, it can also be used for just one side, while on the other side both halves are held together by a union nut of the cable/ear system and a special ring.

Fig. 1 shows the insert adapter in longitudinal section; e;; are shown in the options for holding it together 11.

Fig. 2 shows the injection adapter in cross section with the seal

Fig. 3 shows the blowing adapter in cross section with the step-shaped part joints in the base body and sealing insert.

- 5 -Index

1 - Base body

2 - Compressed air supply

3 - concentrated cavity

4 - Output

5 - Sealing insert

6 - 0-iang

7 - Ring groove

8 - conical shape

9 - Rejuvenation

10 - Bore

11 - Annular chamber

12 - Outer groove

13 - Radial bore

14 - Radial bore

15 - Axial bore

16 - Radial bore with internal thread

17 - concentric groove

18 - Ring

19 - Slot

20 - Groove

21 - O-Ring - Canoeist

22 - Sealing element

23 - External thread

24 - Mother

25 - Slot

26 - Internal thread

27 - Ring groove

28 - Outer cone

29 - Special ring

30 - Seal

31 - Partial joint base body

32 - Partial joint sealing insert

Title: Blowing adapter

Course version:

The invention relates to an additional device which creates a connection between a compressed air supply and a compressed air supply. The purpose of the compressed air supply is, on the one hand, to accommodate the cable pipe ^and , on the other hand, to provide a seal between the cable and the supply bore ; in addition, a friction-reducing lubricant is supplied to the cable.

Jj-. Description:

f.; Cables for telecommunications are often installed in pre-laid

[' pipes are laid. This is done using different methods.

: One method is described in the disclosure document

■ DE 3740523 A 1 and the

; EP 0318745 A 2

^r . These are procedures and devices

: ties which are particularly suitable for laying cables and cable ducts

are suitable. Here, the cable is pulled from the cable drum using a feed device and fed into the cable duct through a so-called sleeve. Compressed air is fed into the cable duct through the sleeve, which has the task of driving a piston attached to the start of the cable and adjusted to the pipe diameter in the pipe together with the cable.

This so-called sleeve must therefore fulfil 3 tasks:

seal the air hose,

Seal the cable duct

and the cable sliding through during the longitudinal movement so

Seal as well as possible.

The last task is the most difficult and is difficult to solve using conventional means.

The aim of this invention, also of the blowing adapter, is to solve the three tasks mentioned above; the last-mentioned task as well as the combination of the tasks and an additional supply of a lubricant are particularly noteworthy.

Claims (1)

WITT &Egr;-GmbH
-Boi.rtechnik-P.O. Box 80 3065 Nienstädt Expectations 1. Blow-in adapter for connection to a cable duct pipe with a cable feedthrough option and a connection for a compressed air supply, characterized in that the base body (1) is split lengthwise, has an internal, removable sealing insert (5) and is equipped with the ring (18) and the special ring (29). :.· 2. Blowing adapter according to claim I ₁ characterized net that the base body (1) has a concentric cavity (3) in the area of the compressed air supply (2), the surface of which tapers continuously towards the outlet (4). !'; 3. Blowing adapter according to claim 1 to 2, characterized in I that the sealing insert (5) is split lengthwise and with an O-ring (6), which is preferably in an annular groove (7) ti is located. I 4. Blowing adapter according to claim 1 to 3, characterized in J ₁ is characterized in that the sealing insert (5) has a conical &iacgr; form (8) which is in the taper (9) between ü Hnhlraiim i1\ nnH incnann IA\ 1 ■! an+ hiFioinranf £ 5. Blow-in adapter according to claim 1 to 4, characterized in that the sealing insert (5) is provided with a cable jj diameter corresponding hole (10) which e at short intervals with several concentrically arranged \ Ping chambers(ll). 6. Blowing adapter according to claim 1 to 5, characterized _in that the sealing insert (5) has an outer groove (12), which is connected to an annular chamber (11), preferably the 2nd, through one or more radial bores (13). X 7. Eii.jlas - Adapter according to claim 1 to 6, characterized ; net that the sealing insert (5) in the first and third Annular chamber (ll) has a radial bore (14) which is in a eccentric axial bore (15). 8. Blowing adapter according to claim 1 to 7, characterized in that the base body (1) is provided with a radial bore with ^: Internal thread (16) provided :st, whose distance is equal to bit r of the outer groove (j.2) of the sealing insert (5). 9. Blowing-in adapter according to claims 1 to 8, characterized in that the base body (1) is provided with a concentric groove (17), preferably at both ends, which is cylindrical in the outer diameter and conical in the inner diameter. i-ii &khgr; uia y uäuüi Cu <36&igr;\6&Pgr;&Pgr;&Zgr;£ iCii- net that a ring (18) with an inner cone is inserted into the concentric groove (17) of the base body (1), which ring has a slot that runs from the outer to the inner diameter and also has an annular groove (20) on the outer diameter. 11. Blow-in adapter according to claims 1 to 10, characterized in that the base body (1) is provided at the ends with an external thread (23) which receives a nut (24) which has a slot which runs from the outer to the inner diameter. 12. Blow-in adapter according to claims 1 to 11, characterized in that the base body (1) has an O-ring chamber (21) at one end. 13. Blow-in adapter according to claims 1 to 12, characterized in that the base body (1) at the end opposite the O-ring chamber (21) optionally has an internal thread^) or is provided with a ring nut (27) for receiving an additional sealing element (22). 14. Blowing adapter according to claims 1 to 13, characterized in that the base body (1) is provided at one end with an external cone (28) which accommodates a special ring (29). 15. Blow-in adapter according to claim 1, characterized in that the parting line of the base body (1) is provided with a seal (30). 16. Blowing adapter according to claim 1, characterized in that the parting line of the longitudinally divided base body (1) is designed to be stepped in cross section. 17. Blow-in adapter according to claim 3, characterized in that the '''partial joint of the longitudinally split sealing insert (5) is designed in a stepped cross-section.