A method for manufacturing a heat exchanger, wherein a firmly bonded connection is provided between tubes and ribs in order to form a radiator matrix, the connection provided by aligning and inserting tube ends into openings in a first and second collector in order to connect tubes to the two collectors, and a wall section of shaped tube ends is bent so that the tube ends are fixed against the collector through the wall section with interpositioning of a seal.

A heat exchanger includes a body portion and a pair of end plates at least partially forming an enclosure with the body portion. A plurality of tubes extend through at least one of the body portion and the pair of end plates. At least one tube sheet includes a plurality of openings with a corresponding one of the plurality of tubes located in one of the plurality of openings. The tube sheet is made of a material which expands in the presence of refrigerant.

Various methods and systems are provided for an exhaust gas recirculation cooler including a plurality of cooling tubes. In one example, an exhaust gas recirculation (EGR) cooler includes a plurality of cooling tubes positioned within a housing of the EGR cooler, each cooling tube of the plurality of cooling tubes extending between and directly coupled to tube sheets of the EGR cooler at ends of each cooling tube, where at least one end of one or more cooling tubes of a first portion of the plurality of cooling tubes, inward of a tube sheet coupled to the at least one end, includes a compliant region, where the first portion is positioned proximate to an exhaust inlet of the EGR cooler.

A heat exchange tube (51) for a heat exchanger, heat exchanger and assembly method thereof. The heat exchange tube (51) is a combined heat exchange tube having a space (55) at its center, and the space (55) is configured to accommodate an insertion member (57), such that the combined heat exchange tube is expanded in and joined with a corresponding fin hole (53) in the heat exchanger. A heat exchange tube that is minute or has a small inner diameter can thus be expanded in a heat exchanger fin without employing a brazing process.

Provided is a heat exchanger comprising a flat perforated heat transfer pipe having multiple refrigerant flow paths substantially parallel to each other, a fin provided with an insertion hole into which the flat perforated heat transfer pipe is to be inserted, and headers connected to ones of the refrigerant flow paths at both end portions in a width direction of the flat perforated heat transfer pipe, wherein the refrigerant flow paths are separated by at least four partition walls in the flat perforated heat transfer pipe, and are arranged in the width direction, the flat perforated heat transfer pipe is expanded and joined to the insertion hole, and ones of the refrigerant flow paths arranged at both end portions in the width direction have a greater width than those of other refrigerant flow paths.

The present invention provides manufacturing method of a heat exchanger that, even if the position of a tube opening portion of a tube of a heat exchanger for which tube expansion is conducted, varies depending on the type of a heat exchanger, a mechanism adjusting the stop position of a flare plate as well as any complicated adjusting work therefor are not necessary and a heat exchanger in which flares in the same shape and in constant certain depth are formed at an opening portion of a tube of various kinds of heat exchangers having different total lengths in the longitudinal direction, and a device for a heat exchanger manufacturing method, and an air conditioner and/or outdoor unit thereof equipped with a heat exchanger manufactured using said manufacturing method.

The present invention provides manufacturing method of a heat exchanger that, even if the position of a tube opening portion of a tube of a heat exchanger for which tube expansion is conducted, varies depending on the type of a heat exchanger, a mechanism adjusting the stop position of a flare plate as well as any complicated adjusting work therefor are not necessary and a heat exchanger in which flares in the same shape and in constant certain depth are formed at an opening portion of a tube of various kinds of heat exchangers having different total lengths in the longitudinal direction, and a device for a heat exchanger manufacturing method, and an air conditioner and/or outdoor unit thereof equipped with a heat exchanger manufactured using said manufacturing method.

A heat exchanger according to an embodiment of the present disclosure and an air conditioner having the same include a heat transfer tube through which a refrigerant passes, a fin having a mounting hole in which the heat transfer tube is installed, and a fin collar extending from the mounting hole and being in contact with the heat transfer tube by the expansion of the heat transfer tube, wherein the fin collar includes a base portion provided adjacent to the fin and extending to be bent at a first curvature radius, and a distal end located on the opposite side of the base portion and extending to be bent at a second curvature radius smaller than the first curvature radius.

A heat transfer tube is made of aluminum and includes a streak-shaped Zn diffusion layer (6, 106) which is spirally formed on a circular outer peripheral surface in a length direction. According to this heat transfer tube, even in a case where rainwater or dew concentration water is intensively accumulated in a portion of the outer peripheral surface in a circumferential direction, it is possible to obtain a sufficient corrosion resistance.

A heat transfer tube of a heat exchanger is provided with a first and a second annular convex portions of which outer diameters are partially expanded. The first annular convex portion is positioned on an inner face side of a side plate portion of a case of the heat exchanger and is engaged with a circumferential edge portion of a first hole portion provided for the side plate portion, or the first annular convex portion contacts under pressure with an inner circumferential face of the first hole portion. The second annular convex portion is positioned on an outer face side of a header constituting member and is engaged with a circumferential edge portion of a second hole portion. Thus the side plate portion, the heat transfer tube, and a header are relatively fixed by a simple means.