DD285159A5 - ELASTIC LIP SEAL RING - Google Patents

Abstract

Elastic lip seal for use with different pressure differences as a durable sealing element, z. B. in compressed air systems. The object of the invention is to design a lip seal so that the elastic sealing lip receives a support, which automatically adapts optimally to the sealing lip as a function of the pressure difference under the seal. According to the invention, this is achieved by elastically supporting the lip sealing ring with a corresponding force effect on a plate spring under the effect of the pressure difference. Fig. 1 {lip seal, elastic; Pressure difference; Seal, optimal; Disc spring; support; Lip}

Description

Field of application of the invention

The invention relates to an elastic Lippondichtring for use with different pressure differences as a durable sealing element, for example in Preßluftanlagen.

Characteristic of the known state of the art

In DE 3103319, DE 3220192 and DE 3602 500 solutions are presented to protect against external compressive stresses, in which a plurality of sealing, support or relief lipoes are arranged one behind the other. The disadvantage here is that a gradual reduction of the pressure gradient is not feasible and it always leads to an overload of one of the lips, which must intercept the entire pressure gradient in each case.

Another known solution provides that under the sealing lip a so-called support ring is fixed and thus partially supports the sealing lip at elevated pressure stress. These support rings must be adapted individually to the existing pressure conditions. With changing pressure, this lip seal is thus poorly adapted. Excessive wear or high leakage are the result.

Object of the invention

The aim of the invention is to provide an elastic lip seal, which has a long service life with minimal maintenance for different pressure differences.

Explanation of the essence of the invention &

The invention has for its object to make a lip seal so that the elastic sealing lip receives a support that automatically optimally adapts depending on the pressure difference Uber the seal to the sealing lip. According to the invention this is achieved in that elastically supported under the action of the pressure difference of the lip seal with appropriate force on a Γellerfeder. In this case, depending on the amount of pressure difference, the actual sealing lip is pulled more or less far over the support ring and thus relieved.

Ausführungsbeispicl

In one figure, the invention is shown graphically dargeste'lt.

Fig. 1: sectional view

The lip seal 3 is firmly anchored on the outer circumference in the seal housing 5 and is supported in the central region on the plate spring 4 from. The elastic sealing lip 1 is axially displaceable on the support ring 2 and seals against the shaft 9 from. In the initial position of the inner circumference of the plate spring 4 is located on the stop 6. The interior 7 of the seal is ventilated via a 8 hole 8 to the outside.

Claims (4)

1. Elastic Lir. , pendichtring with Wormfedervorspannung, characterized in that an elastic sealing lip (1) on a support ring (2) preferably arranged axially displaceable and a lip seal (3) under the action of a pressure difference against preferably a plate spring (4) can be positioned. 2. Elastic lip seal according to claim 1, characterized in that a plate spring (4) is mounted on the outer circumference in a seal housing (5). 3. Elastic lip seal according to claim 1-2, characterized in that a plate spring (4) with respect to its stroke on the inner circumference by a stop (6) is limited. 4. Elastic lip seal according to claim 1-3, characterized in that an interior (7) via at least one bore (8) is designed ventilated. For this 1 page drawing Field of application of the invention The invention relates to an elastic lip seal for use with different pressure differences as a durable sealing element, for example in compressed air systems. Characteristic of the known state of the art In DE 3103319, DE 3220192 and DE 3602500 solutions are presented to protect against external compressive stresses, in which a plurality of sealing, support or relief lips are arranged one behind the other. The disadvantage here is that a gradual reduction of the pressure gradient is not feasible and it always leads to an overload of one of the lips, which must intercept the entire pressure gradient in each case. Another known solution provides that under the sealing lip a so-called support ring is fixed and thus partially supports the sealing lip at elevated pressure stress. These support rings must be adapted individually to the existing pressure conditions. With changing pressure, this lip seal is thus poorly adapted. Excessive wear or high leakage are the result. Object of the invention The aim of the invention is to provide an elastic lip seal, which has a long service life with minimal maintenance for different pressure differences. Explanation of the essence of the invention The invention has for its object to make a lip seal so that the elastic sealing lip receives a support that automatically optimally adapts depending on the pressure difference across the seal to the sealing lip. According to the invention this is achieved in that elastically supported under the action of the pressure difference of the lip seal with a corresponding force on a disc spring. In this case, depending on the amount of pressure difference, the actual sealing lip is pulled more or less far over the support ring and thus relieved. embodiment In one figure, the invention is shown in the drawing. Fig. 1: sectional view The lip seal 3 is firmly anchored on the outer circumference in the seal housing 5 and is supported in the central region on the plate spring 4 from. The elastic sealing lip 1 is axially displaceable on the support ring 2 and seals against the shaft 9 from. In the initial position of the inner periphery of the plate spring 4 is located on the stop 6. The interior 7 of the seal is vented through a bore 8 to the outside.