Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1987-01-07
1988-12-06
Ward, Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277125, 277229, 277230, F16J 1510
Patent
active
047891688
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a sealing bush with a sealing packing for high pressures and temperatures to be used for the sealing of components which are movably mounted between separate pressure chambers.
A wide variety of seals are used to separate two pressure chambers from one another or from the atmosphere. Numerous materials are employed for this purpose, e.g., asbestos, rubber, metal, graphite, packing cords of hemp, cotton, carbon, synthetic resins and the like. For static seals, friction between the seals and the components to be sealed is of little concern. In contrast, friction is of great concern when components move relative to each other. Significant problems arise particularly at high pressures and temperatures. Graphite has been found to be especially suitable here. It is also known to use packing cords for high temperatures. The use of graphite, however, has the disadvantages that friction is very high. The advantage is in the high chemical and thermal resistance. Moreover, graphite has outstanding resilience. Conventional packing cords which do not consist of graphite lack good resilience. After clamping, for example, by tightening the gland in a stuffing box, the cords loosen over time. This requires renewed tightening of the gland. However, glands frequently cannot be employed due to space limitations. Wear likewise results in a reduction of the sealing effect.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the invention to so construct a sealing bush with a sealing packing that, without retightening the sealing packing, a sufficient sealing effect, for sealing packings of materials other than graphite, can be maintained over a longer time interval than for conventional designs. The invention which achieves this object is characterized in that the sealing packing is made up of two concentric layers of which the outer consists of graphite and the inner of conventional sealing cords without graphite.
The packing can be clamped by means of a simple thrust collar. The inner sealing surface of the packing then firmly contacts the component to be sealed. Due to the good resilience of the outer graphite layer, the sealing effect is maintained over a long time interval without additional clamping.
The sealing packing may be held by a rigid sleeve which can slidably receive a thrust collar under the action of a sealing force. The sealing packing may here be supported by a shoulder-like diametral constriction of the sleeve. External sealing of the sealing packing from the structural components which accommodate the same can be achieved by a sealing ring which may be slid over the shoulder-like diametral constriction from the outside.
An exemplary embodiment of the invention is schematically illustrated in the drawing and described below.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 a longitudinal section through a sealing bush and
FIG. 2 an example of an installed sealing bush.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The sealing bush according to the invention consists of a sleeve 1 having a diametral constriction 2 and accommodating two concentric sealing packings 3 and 4. The sealing packing 3 consists of conventional packing cords, for example, asbestos, while the packing 4 consists of graphite. The combined packing is supported by the shoulder-like diametral constriction 2 of the sleeve. A thrust collar 5 with a stop flange 6 can be pressed into the sleeve 1 so that, upon tightening under the simultaneous action of the force F and counterforce F.sub.G, the inner surface of the sealing packing assumes the form indicated by the broken line 3' and bears against a component to be sealed. The thrust collar 5 can be pressed into the sleeve 1 by an amount which causes the clearance S between the upper edge of the sleeve and the stop flange 6 to go to zero. In order to prevent stress equalization via the outer surface of the sleeve 1, a sealing ring 7 is pushed onto the shoulder-like diametral constriction of the sleeve 1.
As can be seen in FIG. 2, a piston 9 is
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Kontler Peter K.
Ward Robert S.
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