Compact high pressure rubber hose
View Patent ↗Compact flexible reinforce rubber hose adapted for conveying fluids under high pressure. The hose includes a thin inner tube formed of a vulcanized rubber.
1. A compact hose having a tubular wall comprising:
an innermost tube formed of a vulcanized rubber comprising an acrylonitrile butadiene rubber (NBR) or a copolymer or blend thereof, the innermost tube having a tube wall thickness (t) of between about 0.02-0.05 inch (0.5-1.25 mm);
a first reinforcement layer surrounding the innermost tube and being bonded thereto;
at least a second reinforcement layer surrounding the first interlayer;
an interlayer interposed between the first and the second reinforcement layer, the interlayer bonding the first reinforcement layer to the second reinforcement layer; and
a cover surrounding the second reinforcement layer,
wherein the wall has a hose wall thickness (T), and the tube wall thickness t comprises less than about 25% of the hose wall thickness.
2. The hose of claim 1 wherein the rubber is filled with between about 15-66% by weight of a particulate filler selected from the group consisting of carbon blacks, clays, pulp fibers, and mixtures thereof.
3. The hose of claim 1 wherein the rubber has a modulus of at about 12 MPa and a tensile strength of at least about 18 MPa.
4. The hose of claim 1 wherein each of the first and the second reinforcement layers are spiral wound.
5. The hose of claim 4 wherein:
the first reinforcement layer is spiral wound in a first winding direction; and
the second reinforcement layer is spiral wound in a second winding direction opposite the first winding direction.
6. The hose of claim 5 wherein: the hose has a central longitudinal axis and
the first reinforcement layer is laid at a positive angle relative to the longitudinal axis; and
the second reinforcement layer is laid at a negative angle relative to the longitudinal axis.
7. The hose of claim 6 wherein:
the angle of one of the first and the second reinforcement layer is between about 45° and 63°; and
the angle of the other one of the first and the second reinforcement layer is between about −45° and −65°.
8. The hose of claim 1 wherein:
the first reinforcement layer comprises one or more filaments of a first metal or metal alloy wire; and
the second reinforcement layer lines comprise one or more filaments of a second metal or metal alloy wire fiber the same as or different than the first metal or metal alloy wire.
9. The hose of claim 1 wherein the hose has an inner diameter defined by the innermost tube.
10. The hose of claim 9 wherein:
the inner diameter is between about 0.25-2 inch (6-51 mm).
11. The hose of claim 1 wherein the hose wall thickness T is between about 0.12-0.5 inch (3-13 mm).
12. The hose of claim 1 wherein the hose is rated for a service pressure of 4000-8000 psi (28-55 MPa).