At least two spacers in an elongated shape is provided between an internal pipe and an external pipe along the center line of a double pipe. In the cross section of a bent portion as viewed in a direction along the center line of the double pipe, the first spacer is located inwardly relative to the center of the double pipe with reference to the radial direction of the bent portion. The second spacer is located outwardly relative to the center of the double pipe. When a straight line that passes through the center of the radius of the bent portion and through the center of the double pipe is taken as a reference line at least either one of the first spacer or the second spacer overlaps the reference line.

An automated system for manipulating a workpiece includes a machining device, a locating device configured to determine a position of a workpiece, and a positioning system operatively connected to the machining device and being configured to adjust a position of the machining device to align a centerline of the machining device with a longitudinal axis of the workpiece, based upon the determined position of the workpiece. The machining device includes a stabilizing mechanism to engage the workpiece to maintain the workpiece in the determined position, and a cutting element for performing a machining operation on the workpiece.

An automated system for manipulating a workpiece includes a machining device, a locating device configured to determine a position of a workpiece, and a positioning system operatively connected to the machining device and being configured to adjust a position of the machining device to align a centerline of the machining device with a longitudinal axis of the workpiece, based upon the determined position of the workpiece. The machining device includes a stabilizing mechanism to engage the workpiece to maintain the workpiece in the determined position, and a cutting element for performing a machining operation on the workpiece.

A heat pipe structure includes a base block including a rear surface part thermally connectable to a heat generating body and a heat pipe fixed to a front surface part of the base block and including a heat receiving tubular portion disposed along an in-plane direction of the base block. The base block has a longitudinal direction and a width direction and includes a recessed part in which the heat receiving tubular portion is housed and a pair of wall parts projecting along an outer circumferential surface of the heat receiving tubular portion from width direction both sides of the recessed part, and a container of the heat pipe is caulked and fixed by the recessed part and the pair of wall parts and includes a projecting shape part projecting in a direction opposite to a direction of the caulking between distal end portions of the pair of wall parts.

A manufacturing method for a pipe structure includes a pipe bending step for implementing for a plurality of times a bending process of bending a part of a straight pipe by wrapping the part around a peripheral surface of a rolling block to form a plurality of bend portions in intermediate locations along a longitudinal direction of the pipe. When a final bending process is implemented during the pipe bending step, a position of a rear end portion of the pipe is determined, and relative positions of the pipe and the rolling block in a predetermined y direction are controlled on the basis of the position of the rear end portion so that after the bending process, a y-direction position of the rear end portion is aligned with a y-direction position of the front end portion. According to this configuration, complicated operations such as cutting the respective end portions of the pipe after bending the pipe can be eliminated, and a pipe structure such as a meandering pipe body in which the positions of the respective end portions are aligned can be manufactured appropriately and with favorable productivity.

A manufacturing method for a pipe structure includes a pipe bending step for implementing for a plurality of times a bending process of bending a part of a straight pipe by wrapping the part around a peripheral surface of a rolling block to form a plurality of bend portions in intermediate locations along a longitudinal direction of the pipe. When a final bending process is implemented during the pipe bending step, a position of a rear end portion of the pipe is determined, and relative positions of the pipe and the rolling block in a predetermined y direction are controlled on the basis of the position of the rear end portion so that after the bending process, a y-direction position of the rear end portion is aligned with a y-direction position of the front end portion. According to this configuration, complicated operations such as cutting the respective end portions of the pipe after bending the pipe can be eliminated, and a pipe structure such as a meandering pipe body in which the positions of the respective end portions are aligned can be manufactured appropriately and with favorable productivity.

A heat exchanger for an oxygenator comprises multiple tube sections, each having a longitudinal tube axis, wherein the tube sections are disposed as a bundle having a longitudinal bundle axis, and the tube sections are connected to each other in at least one connecting section of the bundle by joining by way of chemical and/or physical bonded joints. A method for producing the heat exchanger is also provided.

A heat exchanger for an oxygenator comprises multiple tube sections, each having a longitudinal tube axis, wherein the tube sections are disposed as a bundle having a longitudinal bundle axis, and the tube sections are connected to each other in at least one connecting section of the bundle by joining by way of chemical and/or physical bonded joints. A method for producing the heat exchanger is also provided.

A method in accordance with the present application includes sending a raw tube from a drum to an unwinding side capstan while the raw tube is rotated around a central axis perpendicular to a winding shaft of the drum by rotating the drum and the unwinding side capstan about the central axis concurrently with unwinding of the raw tube from the drum holding the raw tube, on an inner surface of which multiple straight grooves along a longitudinal direction of the raw tube are formed with an interval in a circumferential direction, in a coil shape, to wind the raw tube around the unwinding side capstan, and drawing in which the unwound raw tube is drawn while the diameter of the raw tube is reduced, and then the raw tube is wound around the drawing side capstan to twist the raw tube and obtain an inner spiral grooved tube.

A method in accordance with the present application includes sending a raw tube from a drum to an unwinding side capstan while the raw tube is rotated around a central axis perpendicular to a winding shaft of the drum by rotating the drum and the unwinding side capstan about the central axis concurrently with unwinding of the raw tube from the drum holding the raw tube, on an inner surface of which multiple straight grooves along a longitudinal direction of the raw tube are formed with an interval in a circumferential direction, in a coil shape, to wind the raw tube around the unwinding side capstan, and drawing in which the unwound raw tube is drawn while the diameter of the raw tube is reduced, and then the raw tube is wound around the drawing side capstan to twist the raw tube and obtain an inner spiral grooved tube.