Reversed, double-helical bellows seal
First Claim
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1. A flexible double bellows seal comprising:
- a plurality of rings including first and second end rings and a middle ring;
a first bellows formed from a flexible material, the first bellows being sealingly connected between the first end ring and the middle ring, the first bellows having a twist bias in a first rotational direction relative to an axis of the rings; and
a second bellows formed from a flexible material, the second bellows being sealingly connected between the second end ring and the middle ring, the second bellows having a twist bias in a second rotational direction relative to an axis of the rings that is opposite that of the first rotational direction.
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Abstract
A double bellows seal including a plurality of rings having first and second end rings, a middle ring, a first bellows, and a second bellows. The first bellows is formed from a flexible material that is sealingly connected between the first end ring and the middle ring, and it has a twist bias in a first rotational direction relative to an axis of the rings. The second bellows is formed from a flexible material that is sealingly connected between the second end ring and the middle ring. The second bellows has a twist bias in a second rotational direction relative to an axis of the rings that is opposite that of the first rotational direction.
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Citations
13 Claims
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1. A flexible double bellows seal comprising:
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a plurality of rings including first and second end rings and a middle ring;
a first bellows formed from a flexible material, the first bellows being sealingly connected between the first end ring and the middle ring, the first bellows having a twist bias in a first rotational direction relative to an axis of the rings; and
a second bellows formed from a flexible material, the second bellows being sealingly connected between the second end ring and the middle ring, the second bellows having a twist bias in a second rotational direction relative to an axis of the rings that is opposite that of the first rotational direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
a plurality of triangular shaped stiffeners attached to each of the first and second bellows, each of the bellows having folds along spaces between each of the stiffeners such that substantially helical pleats are formed within each of the bellows.
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12. A double bellows seal as recited in claim 11 wherein the stiffeners are attached to an outside surface of each of the bellows.
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13. A double bellows seal as recited in claim 11 wherein each of the stiffeners has a triangular outline shape.
Specification