A heat exchanger in which a connecting part may be coupled to a header tank of the heat exchanger in the short term without using a separate coupling component before a brazing process is performed, and a coupling method of a connecting part thereof. The connecting part is coupled to a first header tank or a second header tank while surrounding a predetermined region of an outer peripheral surface of the first header tank or the second header tank, a region of the connecting part to which external force is locally applied being coupled to the first header tank or the second header tank while protruding together with the first header tank or the second header tank.

A brazing method for brazing a material without using a flux includes performing brazing in an inert gas atmosphere, in a state in which the material to be brazed is covered with a cover member formed of an upper cover portion covering the whole upper portion of the material to be brazed and side cover portions covering at least some of the side portions of the material to be brazed, with the upper cover portion contacting the upper portion of the material to be brazed, and the material to be brazed and the cover member are held with a heat transmission promoting member formed of an upper heat transmission promoting portion and a lower heat transmission promoting portion, with the upper heat transmission promoting portion contacting the upper cover portion, and with the lower heat transmission promoting portion contacting the lower portion of the material to be brazed.

An internal structure of vapor chamber is provided. A first plate has an inner surface. A periphery of the first plate has a sealing edge extending outwardly; a level difference exists between the first plate and the sealing edge. Multiple supporting protrusions are formed on the inner surface of the first plate. A second plate has an inner surface spaced apart from the inner surface of the first plate. The brazing structure has a sealing portion and connecting portions, the sealing portion is fixed between the second plate and the sealing edges of the first plate, and the connecting portions are respectively disposed between the corresponding supporting portions of the first plate and of the second plate. The sealing portion is disposed around a periphery of the second plate to align and contact with the sealing edge.

A method and apparatus for manufacturing a brazed heat exchanger. The method includes the steps of: assembling the heat exchanger components to form at least one unbrazed heat exchanger core in a core builder machine; without removing the at least one heat exchanger core from the core builder machine, enclosing the heat exchanger core with a brazing tool arrangement adapted to form a chamber, optionally, evacuating the chamber and/or filling the chamber with a controlled atmosphere; brazing the heat exchanger core in the chamber to form a brazed heat exchanger.

A stainless-steel heat-exchanger port with a braze joint interface formed from a brazing filler material by vacuum melting and molding, including: a stainless-steel port, an annular groove provided at a to-be-brazed end face of the stainless-steel port, a brazing filler material correspondingly arranged in the annular groove, and a sealing cover for preventing overflowing of the brazing filler material when melted, wherein the brazing filler material is one of copper, brass, phosphorus copper, and silver brazing filler materials. A processing method for the stainless-steel heat-exchanger port with a braze joint interface formed from the brazing filler material by vacuum melting and molding.

A heat exchanger in which an end portion of a heat exchange element is appropriately joined to an insertion hole of a header. The heat exchanger includes a heat exchange element extending in a first direction and a header to which the heat exchange element is connected. The heat exchange element includes at least one heat transfer tube extending in the first direction and a fin provided on part of an edge portion of the at least one heat transfer tube in a second direction crossing orthogonally with the first direction. An end portion in the first direction of the heat exchange element includes an insertion part being inserted into an interior of the header, an abutment part abutting the header in a part other than the insertion part, and a spaced-apart part being spaced apart from the header in a part other than the insertion part.

A method of making a heat exchanger that includes sealing tubes to header slots and brazing the tubes to the header slots. The method further includes coupling a cover to the header to cover a liquid-side surface of the header and to cover ends of the tubes, and applying flux to an air-side surface of the header and to the tubes. Coupling the cover to the header is performed after sealing the tubes to the header slots and coupling the cover to the header is performed before applying flux to the air-side surface of the header and to the tubes. Applying flux is performed before brazing each of the tubes to the header slots and sealing each of the tubes to the header slot includes sealing a perimeter of each of the tubes to the header slot.

A tool system controls and prevents gaps during processing of assemblies at elevated temperature. Gaps are prevented from arising at joints between components during temperature changes. The tool system includes a lever arm having a body, a connection configured to allow the body to pivot, a cam surface defined by the body and configured to engage the second component, and a weight arm extending from the body and over the second component. In response to movement of the second component, the lever arm is configured to pivot at the connection while the weight arm is configured to generate a force transferred through the body to the second component to maintain contact at the joint between the first component and the second component. A rod may be connected with the lever arm for added weight.

A heat exchanger includes a plurality of flat heat transfer tubes each having a flat cross-sectional shape, a flat outer side surface, and an interior defining a passage through which a fluid flows, the plurality of flat heat transfer tubes being arranged with the flat outer side surfaces facing each other, and a plurality of corrugated fins each having a wavy shape, each of the plurality of corrugated fins being disposed between and joined to flat heat transfer tubes of the plurality of flat heat transfer tubes that are adjacent to each other. Each of the plurality of corrugated fins has portions that correspond to peaks of the wavy shape and have lower flexural rigidity than other portions of the corrugated fin.

A liquid to refrigerant heat exchanger includes an enclosed coolant volume that is at least partially defined by a plastic housing and by a metal closure plate. The metal closure plate can be part of a brazed assembly containing a continuous refrigerant flow path. The refrigerant flow path is disposed within the coolant volume, where heat can be transferred between the refrigerant within the refrigerant flow path and the liquid within the coolant volume. The plastic housing can at least partially surround the refrigerant flow path to at least partially bound a liquid flow path along a portion of the coolant volume. An inlet diffuser and an outlet diffuser can be mounted to the housing to direct the liquid through the housing. The plastic housing is sealingly joined to the closure plate along an outer periphery of the closure plate.