Abstract: A double pipe connection structure includes a joint member and a double pipe having an inner pipe and an outer pipe coaxially disposed therein. Further, the double pipe connection structure includes a supporting rib formed integrally therewith in an axial direction, wherein the supporting rib connects the inner pipe to the outer pipe. Further, the joint member includes a first hole into which the outer pipe is inserted and a second hole into which the inner pipe is inserted, wherein the second hole has a diameter that is smaller than a diameter of the first hole, and wherein the first and second holes are bored to be aligned in an axial direction. Moreover, in the joint member, a first-pressure connecting hole communicates with the first hold and a second-pressure connecting hole communicates with the second hole, such that a pressure in the first-pressure connecting hole is lower than a pressure in the second-pressure connecting hole.

Abstract: An expansion valve having a tubular member (15) for receiving a low-pressure refrigerant (14) sent from an evaporator (13) and also having a tube member (16) inserted in the tubular member (15) and receiving a high-pressure refrigerant sent from a condenser (12). The expansion valve has a valve mechanism (17) provided in the tube member (16). An end wall (18) is formed at one end (15a) of the tubular member (15), and the end wall (18) has a low-pressure inflow hole (19) for allowing the refrigerant (14) sent from the evaporator (13) to flow into the tubular member (15) and a high-pressure outflow hole (20) for allowing the refrigerant (14) to flow out from the tube member (16) into the evaporator (13).

Abstract: The present invention provides a double pipe connection structure where, in a distal end portion of an outer pipe of a double pipe, an outer pipe expanded part detached from a supporting rib and having a diameter expanded more than that of a general part of the outer pipe is formed; the outer pipe is coupled with a joint member by caulking a collar part at a periphery of an open end portion of a large diameter hole of the joint member in a state that an inner pipe end portion of the double pipe is inserted into a small diameter hole while an inner pipe side O-ring mounted on an outer periphery thereof is press-contacted with an inner periphery of the small diameter hole of the joint member; and the outer pipe expanded part is inserted into the large diameter hole while an outer pipe side O-ring mounted on an outer periphery thereof is press-contacted with an inner periphery of the large diameter hole of the joint member.

Abstract: A production apparatus for bending a multi-channel tube having an outer tube and a partition partitioning an interior of the outer tube into two or more channel holes is provided with a bending mold configured to bend the multi-channel tube in a bend radius; a pressure mold configured to press the multi-channel tube toward the bending mold; a chuck portion configured to hold and draw the multi-channel tube along the bending mold; and mandrels respectively inserted into the channel holes, each of the mandrels including; a mandrel body configured to support inner surfaces of each channel hole; a support device rotatably and movably supporting the mandrel body.

Abstract: A connection structure of a multi-channel tube with branching tubes is provided with a multi-channel tube having an end, the multi-channel tube including; an outer tube; a partition being formed in a unitary body and running parallel with the outer tube, the partition partitioning an interior of the outer tube into two or more channel holes; and a passage formed at an end of the partition, the passage linking the channel holes; two or more branching tubes respectively inserted into the channel holes to an insertion depth greater than a depth of the passage measured from the end of the multi-channel tube; and brazing material spreading beyond the passage over clearances between the multi-channel tube and the branching tubes and connecting the multi-channel tube and the branching tubes.

Abstract: A tube having a multi-channel tube and branch tubes, a connection structure thereof and a connection method therefor are disclosed. The tube is provided with: a multi-channel tube including a partition wall to partition an interior of the multi-channel tube into plural channels and an expanded end portion ; branch tubes inserted into the expanded end portion and respectively communicating with the channels; and clearances for being filled with brazing metal, which are respectively kept between the multi-channel tube and each of the branch tubes.

Abstract: A double pipe has an outer pipe and an inner pipe that is formed in a spiral or wavy configuration and is held by an inner circumferential face of the outer pipe.

Abstract: A coupling for a double tube is configured to connect with the double tube. The double tube includes an outer tube for a first fluid to flow therethrough. The double tube includes an inner tube provided inside of the outer tube and having an end protruding from the outer tube, the inner tube for a second fluid to flow therethrough. The coupling includes a branched portion brazed to an end of the outer tube and brazed to an end of the inner tube, with the end of the inner tube protruding outside through the branched portion. The branched portion is formed as a curved tube having a curved portion. The branched portion has an end joined to an end of the outer tube, with the curved portion having a through-hole for the inner tube to pass therethrough.

Abstract: A double pipe has an outer pipe and an inner pipe that is formed in a spiral or wavy configuration and is held by an inner circumferential face of the outer pipe.

Abstract: A pipe arrangement branching structure is provided with a perforated pipe having two holes partitioned by a partition wall and a plurality of branch pipes connected to the respective holes of the perforated pipe in an air-tight manner. The holes of the perforated pipe at an end thereof are formed to have shapes coincident with outer shapes of the respective branch pipes by plastic deformation work. The respective branch pipes are inserted into the holes formed by the plastic deformation work and the perforated pipe and the respective branch pipes are brazed.

Abstract: A joint for joining a double pipe, which is provided with an outer pipe for transfer of a first fluid, and an inner pipe for transfer of a second fluid. The joint is provided with a flange including a first through bore and a second through bore, a branch portion and a connection pipe having a first end and a second end, the first end being brazed with the inner pipe of the double pipe and the second connection portion being inserted into the second through bore and defining a second portion for connection of the second circuit pipe, whereby the connection pipe transfers second fluid between the second circuit pipe and the outer pipe of the double pipe. The branch portion is provided with a first connection portion for connection of the first circuit pipe, the first connection portion being inserted into the first through bore.

Abstract: A flexible hose for use as a refrigerant passageway in a vehicular refrigerating cycle has an inner hose and an outer hose. The outer hose covers the inner hose with a space formed in a given distance. The outer hose and the inner hose are formed of resin having flexibility.

Abstract: A connection structure of a multi-channel tube with branching tubes is provided with a multi-channel tube having an end, the multi-channel tube including; an outer tube; a partition being formed in a unitary body and running parallel with the outer tube, the partition partitioning an interior of the outer tube into two or more channel holes; and a passage formed at an end of the partition, the passage linking the channel holes; two or more branching tubes respectively inserted into the channel holes to an insertion depth greater than a depth of the passage measured from the end of the multi-channel tube; and brazing material spreading beyond the passage over clearances between the multi-channel tube and the branching tubes and connecting the multi-channel tube and the branching tubes.

Abstract: A production apparatus for bending a multi-channel tube having an outer tube and a partition partitioning an interior of the outer tube into two or more channel holes is provided with a bending mold configured to bend the multi-channel tube in a bend radius; a pressure mold configured to press the multi-channel tube toward the bending mold; a chuck portion configured to hold and draw the multi-channel tube along the bending mold; and mandrels respectively inserted into the channel holes, each of the mandrels including; a mandrel body configured to support inner surfaces of each channel hole; a support device rotatably and movably supporting the mandrel body.

Abstract: A duplex pipe (10) is cut with a cutting tool (30), for cutting connecting ribs (13) from the end face of the duplex pipe (10) which is held with an outer pipe (11) chucked (rib cutting step). The duplex pipe (10) is cut from the end face of the duplex pipe (10) up to the portion thereof corresponding to the exposed length of the inner pipe (12) to thereby form a slit (21) in the outer pipe (11) and connecting ribs (13) (slit forming step). The cutting tool (30) has a guide hole (31) into which the inner pipe (12) can be inserted while guiding the inner pipe outer peripheral surface (12a), a cutting device (32) for cutting the connecting ribs (13), and a guide pin (33) which can be inserted into the inner pipe (12) while guiding the inner pipe inner peripheral surface (12b).

Abstract: An air-conditioning apparatus for a vehicle wherein noise in the passenger's compartment is reduced by suppressing transmission of vibration to the evaporator, and the prevention of coolant leakage is enhanced, and at the same time, the man-hours for inspection are reduced by reducing the number of pipe joints. The cooling capacity is also enhanced by replacing the sub-cooling process in the condenser and the super-heating process in the evaporator, and further space in the narrow engine compartment is effectively used.

Abstract: A coupling for a double tube is configured to connect with the double tube. The double tube includes an outer tube for a first fluid to flow therethrough. The double tube includes an inner tube provided inside of the outer tube and having an end protruding from the outer tube, the inner tube for a second fluid to flow therethrough. The coupling includes a branched portion brazed to an end of the outer tube and brazed to an end of the inner tube, with the end of the inner tube protruding outside through the branched portion. The branched portion is formed as a curved tube having a curved portion. The branched portion has an end joined to an end of the outer tube, with the curved portion having a through-hole for the inner tube to pass therethrough.

Abstract: A double pipe has an outer pipe and an inner pipe that is formed in a spiral or wavy configuration and is held by an inner circumferential face of the outer pipe.

Abstract: A joint 50 for duplex pipes is to connect to a duplex pipe 100 where an outer pipe 101, an inner pipe 102, and ribs 103 are unitized to be the duplex pipe 100 as one body through an extruding process or a drawing process, having a main body 110 which is provided at its one end to an end portion 101a of the outer pipe exposing the inner pipe 102 by partially eliminating the outer pipe 101, a wall face part 112 equipped at the other end of the main body 110 for penetrating the exposed inner pipe 102, and a connecting pipe 120 provided in the opening 113. An opening is formed at places to be determined in response to disposing conditions of the connecting pipes.

Abstract: A flexible hose for use as a refrigerant passageway in a vehicular refrigerating cycle has an inner hose and an outer hose. The outer hose covers the inner hose with a space formed in a given distance. The outer hose and the inner hose are formed of resin having flexibility.