Refrigerant transporting hose

• US 4,905,735 A
• Filed: 11/23/1988
• Issued: 03/06/1990
• Est. Priority Date: 11/28/1987
• Status: Expired due to Term

• Current Assignee: Tokai Rubber Industries Limited
• Original Assignee: Tokai Rubber Industries Limited
• Inventors: Akiyoshi, Koji
• Primary Examiner(s): Robinson, Ellis P.
• Assistant Examiner(s): Turner, Archene A.
• Application Number:
  US07/275,510
• Time in Patent Office: 468 Days
• Field of Search: 428/36.1, 428/36.2, 428/36.91, 428/36.8, 428/212, 428/215, 428/131, 428/492, 428/494, 138/124, 138/125, 138/126, 138/137
• US Class Current: 138/126
• CPC Class Codes: F16L 11/08 with reinforcements embedded in the wall F16L11/11 takes precedence
• CPC Class Codes: Y10T 428/1362 Textile, fabric, cloth, or pile containing [e.g., web, net, woven, knitted, mesh, nonwoven, matted, etc.]
• CPC Class Codes: Y10T 428/1366 Textile, fabric, cloth, or pile is sandwiched between two distinct layers of material unlike the textile, fabric, cloth, or pile layer
• CPC Class Codes: Y10T 428/1386 Natural or synthetic rubber or rubber-like compound containing
• CPC Class Codes: Y10T 428/1393 Multilayer [continuous layer]
• CPC Class Codes: Y10T 428/24273 including aperture
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/24967 Absolute thicknesses specified
• CPC Class Codes: Y10T 428/31826 Of natural rubber
• CPC Class Codes: Y10T 428/31833 Next to aldehyde or ketone condensation product or addition polymer from unsaturated monomers

Abstract

A refrigerant transporting hose having an inner tube including an inner and an outer rubber layer and an intermediate resinous layer interposed between the inner and outer rubber layers; an outer tube formed of a rubber material located radially outwardly of the inner tube; and a reinforcing fiber layer interposed between the inner and outer tubes, such that the fiber layer and the inner and outer tubes constitute an integral tubular body, the inner rubber layer of the inner tube having a resistance to water permeation as high as, or higher than, that of the outer rubber layer. The inner rubber layer may be formed of a rubber material selected from the group consisting of acrylonitrile-butadiene rubber (NBR), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CPE), epichlorohydrin rubber (CHC, CHR), chloroprene rubber (CR), chlorinated isobutylene-isoprene rubber (Cl-IIR) and ethylene propylene diene rubber (EPDM). The intermediate resinous layer may be formed of a resin selected from the group consisting of polyamide resin, saponified ethylene-vinyl acetate copolymer and a blend of polyamide and rubber material. The outer rubber layer may be formed of a rubber material selected from the group consisting of NBR, CSM, CPE, CHC, CHR, CR, Cl-IIR and EPDM.

Claims

1. A refrigerant transporting hose comprising:

an inner tube for transporting a refrigerant, said inner tube including an inner and an outer rubber layer and an intermediate resinous layer interposed between said inner and outer rubber layers, said intermediate resinous layer resisting permeation of refrigerant therethrough, said inner rubber layer having a thickness of 0.05 to 1 mm, said intermediate resin layer having a thickness of 0.05 to 0.5 mm, said outer rubber layer having a thickness of 1 to 3 mm, said intermediate resinous layer being adhesively bonded to said inner and outer rubber layers;

an outer tube of a rubber material located radially outwardly of said inner tube, said outer tube having a thickness of 1 to 2.5 mm; and

a reinforcing fiber layer interposed between said inner tube and said outer tube, said reinforcing fiber layer being adhesively bonded to the inner and outer tubes to constitute an integral tubular body,

said inner rubber layer of the inner tube being formed of a rubber material selected from the group consisting of acrylonitrile-butadiene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, epichlorohydrin rubber, chloroprene rubber, chlorinated isobutylene-isoprene rubber and ethylene propylene diene rubber,

said intermediate resinous layer of the inner tube being formed of a resinous material selected from the group consisting of polyamide resin, saponified ethylene-vinyl acetate copolymer and a blend of polyamide resin and rubber material,

said outer rubber layer of the inner tube being formed of a rubber material selected from the group consisting of acrylonitrile-butadiene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, epichlorohydrin rubber, chloroprene rubber, chlorinated isobutylene-isoprene rubber and ethylene propylene diene rubber,

said inner rubber layer having a resistance to water permeation as high as, or higher than, a resistance to water permeation of said outer rubber layer,

said intermediate resinous layer having a resistance to water permeation lower than the resistance to water permeation of each of said inner and outer rubber layers.

2. The hose as set forth in claim 1, wherein said resistance to water permeation of the inner rubber layer of the inner tube is higher than said resistance to water permeation of the outer rubber layer.

3. The hose as set forth in claim 1, wherein said outer rubber tube has a plurality of spiking holes formed therethrough, said spiking holes communicating said reinforcing fiber layer with ambient atmosphere outside the outer rubber tube.

4. A refrigerant transporting hose comprising:

an inner tube for transporting a refrigerant, said inner tube including an inner and an outer rubber layer and an intermediate resinous layer interposed between said inner and outer rubber layers, said intermediate resinous layer resisting permeation of refrigerant therethrough, said inner rubber layer having a thickness of 0.05 to 1 mm, said intermediate resin layer having a thickness of 0.05 to 0.5 mm, said outer rubber layer having a thickness of 1 to 3 mm, said intermediate resinous layer being adhesively bonded to said inner and outer rubber layers;

an outer tube of a rubber material located radially outwardly of said inner tube, said outer tube having a thickness of 1 to 2.5 mm; and

a reinforcing fiber layer interposed between said inner tube and said outer tube, said reinforcing fiber layer being adhesively bonded to the inner and outer tubes to constitute an integral tubular body,

said inner rubber layer of the inner tube having a resistance to water permeation higher than a resistance to water permeation of said outer rubber layer of the inner tube,

said intermediate resinous layer of the inner tube having a resistance to water permeation lower than the resistance to water permeation of each of said inner and outer rubber layers.

5. The hose as set forth in claim 4, wherein said inner rubber layer of the inner tube is formed of a rubber material selected from the group consisting of acrylonitrile-butadiene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, epichlorohydrin rubber, chloroprene rubber, chlorinated isobutylene-isoprene rubber and ethylene propylene diene rubber.

6. The hose as set forth in claim 4, wherein said intermediate resinous layer of the inner tube is formed of a resinous material selected from the group consisting of polyamide resin, saponified ethylene-vinyl acetate copolymer and a blend of polyamide and rubber material.

7. The hose as set forth in claim 4, wherein said outer rubber layer of the inner tube is formed of a rubber material selected from the group consisting of acrylonitrile-butadiene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, epichlorohydrin rubber, chloroprene rubber, chlorinated isobutylene-isoprene rubber and ethylene propylene diene rubber.