DE2143736A1 - ARRANGEMENT FOR SEALING SHAFT PIPES - Google Patents

Description

Arrangement for sealing shaft passages The invention relates on an arrangement for sealing shaft penetrations, preferably for Feedthroughs for underwater vehicles in the outboard area.

In the case of hulls, there are sealing arrangements for shaft penetrations Known in the outboard area in various trainings. These seals essentially have the task of preventing water from entering.

It is also known to use stuffing boxes for this purpose.

In the case of submarine devices, the seal is also determined according to the depth of use affected by a relatively large external pressure and thus by a large pressure gradient.

As a result, it is no longer possible with the known seals achieve satisfactory seals.

In tail shaft bearings for ships, it is also known that Encapsulate the entire shaft lead-through with a housing and the interior of the housing to fill with lubricants.

The object of the invention is to provide a seal for a shaft bushing to create a relatively large pressure gradient, which is also the case with tinter water operation does not lead to any leaks.

This object is achieved according to the invention in that between Passage opening and shaft in the longitudinal direction of the shaft gland-like sealing elements arranged one behind the other in the manner of a labyrinth seal and each between adjacent sealing elements pressure spaces are formed, with the pressure in the outer Pressure space corresponds approximately to the external pressure, while the pressure in each subsequent one Pressure space is reduced for gradual pressure relief.

The advantage of this arrangement is that with the differential pressure relief through the outer pressure chamber and through the gradual reduction of the pressure drop The disturbing leaks can be prevented via the subsequent pressure chambers.

In order to create an adaptable arrangement, in a further embodiment the invention proposed that the pressure of each pressure chamber as a function of occurring external pressure and the pressure gradient is controllable.

To simplify the arrangement, it is provided that the pressure chambers are connected to one another via a flow throttle. This makes it possible to operate an arrangement with several pressure chambers with one pump.

An exemplary embodiment of the invention is shown schematically in the drawing shown. This is from the vehicle interior 1 in the outboard area 2 emerging shaft 3 guided through a passage opening 4.

The passage opening 4 is in the form of a sleeve-like seal carrier 5 Housing formed. There are three in a row between the passage opening 4 and the shaft 3 lying individual glands 6, 7 and 8 arranged. Each gland 6, 7 or 8 is made from an elastic sealing body 9 and a guide body 10. The guide body 10 are arranged in the seal carrier 5 in such a way that they have the elastic sealing body 9 press against the shaft 3 via the axial pressure of an end piece 11 and total a labyrinth seal is created.

Between the adjacent stuffing boxes 6.7 and 7.8 there is a closed pressure chamber 12 or 13 formed, which is connected to the shaft 3 and thus also with the elastic sealing body 9 is in connection.

In this exemplary embodiment, there is one in each case in the area of the shaft 3 Annular groove 14 and 15 as part of the pressure chamber 12 and 13, respectively, with bores 16 or 17 the connection with the other part of the pressure chamber t2 BSW. 13 manufactured will.

The pressure chamber 12 is with a pump (not shown) via a Feed opening 19 brought to the pressure in the outboard area 2, so that a complete Pressure relief of the sealing part most endangered by the external medium takes place.

Depending on the pressure drop from the outboard area 2 to the The vehicle interior 1 also becomes the pressure chamber 13 for gradual pressure relief brought to a lower pressure.

In the illustrated embodiment, it is between the pressure chambers 12 and 13, a flow throttle 18 is arranged and the pressure chamber 12 is provided with a Pump connected via the supply opening 19, while the pressure chamber 13 via the flow throttle 18 is supplied and has an outlet opening 20.

The pressure chambers 12 and 13 can of course except one gaseous medium can also be supplied to a liquid medium.

The invention is explained below using a numerical example. A pressure of 61 at-in the outboard area is 2 and of 1 at in the vehicle interior 1 accepted. According to the invention, the pressure chamber 12 must then have a pressure of approximately 61 at, while the pressure chamber 13 has a lower pressure of, for example 31 at. This results in a gradual pressure reduction of 30 at from the pressure chamber 12 to the pressure chamber 13 and from the pressure chamber 13 to the vehicle interior 1.

Claims (3)

P a t e n t a n 8 p r U c h e 9 Arrangement for sealing shaft ducts, preferably for Penetrations for submersible vehicles in the outboard area, d u r c h g e k e n n n -z e i c h n e t that between the passage opening (4) and shaft (3) in the longitudinal direction of the shaft gland-like sealing elements (6,7,8) one behind the other arranged in the manner of a labyrinth seal and each between adjacent ones Sealing elements (6,7 or 7,8) pressure spaces (12,13) are formed, whereby the pressure in the outer pressure chamber (12) corresponds approximately to the external pressure, while the pressure in each subsequent pressure chamber (13) is reduced for gradual pressure relief. 2. Arrangement according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that the pressure of each pressure chamber (12, 13) as a function of the occurring External pressure and the pressure gradient is controllable. 3. Arrangement according to claim 1 and 2, d a d u r c h g e -k e n n z e i c h n e t that the pressure chambers (12, 13) are connected to one another via a flow throttle (18) are connected. L e r s e i t e