DE29921591U1 - Shaft sealing of a rotating machine with a mechanical seal of the type drive seal - Google Patents

Description

PUMPENFABRIK WANGEN GmbH Utility model application

Simoniusstr. 17, D-88239 Wangen Transverse rotating feeding device for screw conveyors

Tel. 07522/997-100, fax. 07522/997-108 AZ _:

02 December 1999.

Description:

State of the art, problem: The invention specified in claim 1 (Figure 1) is based on the following problem of sealing technology: Mechanical seals of the type of drive seal are known in technology and are successfully used to seal shafts when sealing against particle-laden liquids or sludge at a low pressure difference is required. Mechanical seals of the type of drive seal are not suitable for sealing larger pressure differences in their typical form.

Problems arise, among other things, when these seals are intended to seal against larger pressure differences, or when substances are present on the seal that change when in contact with air.

Known approaches to solving the problem involve using other mechanical seal solutions that do not have the advantages of mechanical seals such as face seals for particle-laden liquids or slurries, but are suitable for larger pressure differences.

Solution: The invention specified in claim 1 solves the problem by a targeted pressure build-up on one side of the mechanical seals in the form of a drive seal, so that the effective pressure difference across the mechanical seals in the form of a drive seal is small or vice versa.

Achieved advantages: The invention makes it possible for mechanical seals of the type face seal, which have proven themselves in particle-laden liquids or slurries, to also be used in materials that change when in contact with air. It also makes it possible for mechanical seals of the type face seal to also be used in the case of larger pressure differences.

PUMPENFABRIK WANGEN GmbH Utility model application

Simoniusstr. 17, D-88239 Wangen Transverse rotating feeding device for screw conveyors

Tel. 07522/997-100, fax. 07522/997-108 . AZ.

02 December 1999

Example embodiment: The invention specified in claim 1 can be implemented, for example, as a double-acting shaft seal, whereby the space (1) filled with the problematic medium is sealed by a mechanical seal in the form of a drive seal (8) and a further space (4), which is filled with a freely selectable supply medium and is specifically pressurized, is arranged between the mechanical seal in the form of a drive seal (8) and a further shaft seal (6). This further shaft seal (6) can be implemented, for example, as a shaft seal, as a mechanical seal or in another way.

Claims (1)

The mechanical seal in the form of a drive seal with a pressure template. This is characterized in that two hard material rings ( 3 ) run on top of each other and form the dynamic sealing element, which are spring-loaded by elastomer rings ( 2 ) and are secondarily statically sealed by these elastomer rings. According to the invention, such a mechanical seal in the form of a drive seal is subjected to pressure on the side facing away from the space to be sealed.