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Drive pins in a mechanical seal

Imported: 24 Feb '17 | Published: 06 Jan '04

Easa Taheri Oskouei

USPTO - Utility Patents

Abstract

A mechanical seal provides a sealing between a rotatable shaft and a housing. The seal has a stationary part for connection to the housing and a rotary part for rotation with the shaft. Mating sealing faces are carried by the stationary and rotary parts and the rotary parts are mounted on the drive shaft for rotation therewith. Each sealing face is held relatively stationary to their respective stationary or rotary part by means of at least one link member extending therebetween. The link member is arranged for at least limited longitudinal rotation.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will now be described by way of example only with reference to the accompanying drawings wherein

FIG. 1-1 illustrates four slots on the rear of a seal face which are driven by four lugs on a drive ring which is shown in FIG. 1-2.

FIG. 2-1 illustrates two lugs on the seal face and FIG. 2-2 shows two slots on the drive ring.

FIG. 3 illustrates the use of a pins which are pressed into a hole in the drive ring and which do the same job as the lugs in FIGS. 1 & 2.

FIG. 4 illustrate a drive ring under the seal face upon which rectangular or cylindrical pins can be mounted. The point of contact is shown by A and B.

FIGS. 5-

b and

c illustrate that the floating pin design can rotate around the (R) axis and provide a face or line contact (C). As shown in FIG. 5

a, a fixed pin of any shape will mostly have a point contact. FIG. 5-

c illustrates the contact areas on a rectangular head of a floating pin.

FIGS. 6 & 7 illustrate a different shape for the floating pin in which the surface contact is not flat but wherein face or line contact is achieved.

FIG. 8 is a partial longitudinal cross section through a seal of the invention, and illustrates the location of floating pins on the drive ring and slots. FIG. 8 illustrates the pin design at (

1) and (

2). After assembly of the seal, the loose pins will be held in their location and can rotate freely in their position around their axis in the functioning seal.

Claims

1. A mechanical seal to provide sealing between a rotatable shaft and a housing, the seal having a stationary part for connection to the housing and a rotary part for rotation with the shaft, mating sealing faces being carried by said stationary and rotary parts, said rotary part being for mounting on the shaft for rotation therewith, each said sealing face being held relatively stationary to its respective stationary or rotary part by means of at least one link member extending therebetween, wherein said at least one link member includes a surface shaped to effect surface to surface engagement with a surface on a sealing face and is arranged for at least limited rotation around its longitudinal axis relative to the sealing face with which it engages, wherein one end of the link member is loosely fitted in a hole on the stationary part and the other end of the link member is located in a slot or adjacent a lug on the corresponding sealing face such that the link member is rotatable about its longitudinal axis relative to the sealing face with which it engages.

2. A mechanical seal to provide sealing between a rotatable shaft and a housing, the seal having a stationary part for connection to the housing and a rotary part for rotation with the shaft, mating sealing faces being carried by said stationary and rotary parts, said rotary part being for mounting on the shaft for rotation therewith, each said sealing face being held relatively stationary to its respective stationary or rotary part by means of at least one link member extending therebetween, wherein said at least one link member includes a surface shaped to effect surface to surface engagement with a surface on a sealing face and is arranged for at least limited rotation around its longitudinal axis relative to the sealing face with which it engages, wherein one end of the link member is loosely fitted in a hole on the rotary part and the other end of the link member is located in a slot or adjacent a lug on the corresponding sealing face such that it is rotatable about its longitudinal axis relative to the sealing face with which it engages.

3. A mechanical seal to provide sealing between a rotatable shaft and a housing, the seal having a stationary part for connection to the housing and a rotary part for rotation with the shaft, mating sealing faces being carried by said stationary and rotary parts, said rotary part being for mounting on the shaft for rotation therewith, each said sealing face being held relatively stationary to its respective stationary or rotary part by means of at least one link member extending therebetween, wherein said at least one link member includes a surface shaped to effect surface to surface engagement with a surface on a sealing face and is rotatable around its longitudinal axis relative to the sealing face with which it engages, wherein the rotary part and corresponding sealing face are connected with the link member whose longitudinal axis extends radially with respect to the rotary part.

4. A mechanical seal to provide sealing between a rotatable shaft and a housing, the seal having a stationary part for connection to the housing and a rotary part for rotation with the shaft, mating sealing faces being carried by said stationary and rotary parts, said rotary part being for mounting on the shaft for rotation therewith, each said sealing face being held relatively stationary to its respective stationary or rotary part by means of at least one link member extending therebetween, wherein said at least one link member includes a surface shaped to effect surface to surface engagement with a surface on a sealing face and is rotatable around its longitudinal axis relative to the sealing face with which it engages, wherein the seal is a double seal having two sets of faces and link members between each rotary and stationary parts.

5. A mechanical seal to provide sealing between a rotatable shaft and a housing, the seal having a stationary part for connection to the housing and a rotary part for rotation with the shaft, mating sealing faces being carried by said stationary and rotary parts, said rotary part being for mounting on the shaft for rotation therewith, each said sealing face being held relatively stationary to its respective stationary or rotary part by means of at least one link member extending therebetween, wherein said at least one link member includes a surface shaped to effect surface to surface engagement with a surface on a sealing face and is arranged for at least limited rotation around its longitudinal axis relative to the sealing face with which it engages, wherein the link member freely rotate about its longitudinal axis.

6. A mechanical seal to provide sealing between a rotatable shaft and a housing, the seal having a stationary part for connection to the housing and a rotary part for rotation with the shaft, mating sealing faces being carried by said stationary and rotary parts, said rotary part being for mounting on the shaft for rotation therewith, each said sealing face being held relatively stationary to its respective stationary or rotary part by means of at least one link member extending therebetween, wherein said at least one link member includes a surface shaped to effect surface to surface engagement with a surface on a sealing face and is rotatable around its longitudinal axis relative to the sealing face with which it engages, wherein the seal face is made of soft or brittle material.

7. A mechanical seal according to claim 6 wherein the seal face is made of carbon.