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US 5,349,988 AGranted
Corregated refrigeration hose system
AssigneeAeroquip Corporation
InventorsBrian J. Walsh, Robert M. Lefere
Life of this patent
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AssigneeAeroquip Corporation
InventorsBrian J. Walsh, Robert M. Lefere
Estimating the term…
A multiple layer hose and fitting assembly for refrigeration circuits particularly suitable for larger sizes of refrigeration conduit wherein refrigerant loss to the atmosphere through the hose material is minimized and flexibility is maintained. An inner tube of thermoplastic material is employed to minimize refrigerant loss due to permeation, and the inner tube is corrugated to provide lateral flexibility. The hose includes pressure reinforcing layers or covers, and a moisture ingression resistant sheath or layer circumscribes the inner tube to protect the inner tube from contamination by moisture. In the preferred embodiment the sheath is located between a braided reinforcing layer engaging the inner tube and a braided cover. The moisture ingression resistant layer is preferably formed of a thermoplastic rubber, and the adjacent hose layers are capable of limited axial displacement relative to each other to assure lateral flexibility. The hose utilizes fittings which include a serrated socket to aid in fitting retention, and sealing rings or a tubular insert cooperating with the hose corrugations may be employed to augment fitting sealing.
A hose system characterized by its flexibility and low permeation of gases, such as for refrigerants, comprising, in combination, a hose inner tube having a longitudinal axis said hose inner tube comprising, a wall having inner and outer surfaces, and an end, said inner tube being formed of a thermoplastic material, a plurality of annular corrugations defined on said wall, adjacent corrugations being axially spaced and alternately radially extending in the direction of said inner and outer surfaces, said corrugations radially extending in the direction of said wall outer surface defining axially spaced annular grooves within said inner tube, a reinforcing layer tube closely encompassing said inner tube radially located outwardly of said grooves and unbonded with respect to said inner tube and axially displaceable thereto, a flexible continuous wall tube of moisture ingression resistant material extruded upon and circumscribing said reinforcing layer tube and being unbonded with respect to said reinforcing layer tube and a flexible tubular outer cover circumscribing said continuous wall tube, said outer cover being unbonded with respect to said continuous wall tube and all of said tubes and outer cover being axially displaceable with respect to each other and axially displaceable with respect to each other during lateral deflection of the hose system assembly.
A hose system characterized by its flexibility and low permeation of gases, such as for refrigerants, comprising, in combination, a hose inner tube having a longitudinal axis said hose inner tube comprising, a wall having inner and outer surfaces, and an end, said inner tube being formed of a thermoplastic material, a plurality of annular corrugations defined on said wall, adjacent corrugations being axially spaced and alternately radially extending in the direction of said inner and outer surfaces, said corrugations radially extending in the direction of said wall outer surface defining axially spaced annular grooves within said inner tube, a flexible outer cover circumscribing said inner tube and an intermediate continuous wall tube of flexible moisture ingression resistant material extruded upon and circumscribing said inner tube located between said inner tube and said outer cover, said inner tube being unbonded with respect to said intermediate tube and said outer cover being unbonded with respect to said intermediate tube and all of said tubes and outer cover being axially displaceable with respect to each other and axially displaceable with respect to each other during lateral deflection of the hose system assembly.
Dependencies are inferred from the claim text.