In a mixed composition coating material for brazing, when a total mass of a solid material, an organic solvent, and water is defined as 100 mass %, the solid material are contained in an amount of 30 mass % or greater and 80 mass % or less with respect to the whole coating material, the organic solvent and the water is contained in a total amount of 20 mass % or greater and 70 mass % or less with respect to the whole coating material, and the water is contained in an amount of 0.4 mass % or greater and 2.5 mass % or less with respect to the whole coating material.

The present disclosure provides a micro-channel heat exchanger including two collecting pipes, and a plurality of flat pipes and two side plates that are arranged between the two collecting pipes, wherein the two side plates are located on two outer sides of the flat pipes and are defined as a first side plate and a second side plate respectively; fins are respectively arranged between the first side plate and the adjacent flat pipe and between the second side plate and the adjacent flat pipe; and the outer side of the first side plate and/or the second side plate is provided with a blocking part at a position close to the collecting pipe, and the blocking part can prevent composite material on the collecting pipe from flowing to a middle part of the first side plate and/or the second side plate.

A bent heat exchanger is provided. The bent heat exchanger includes: a first header and a second header; a plurality of flat tubes, two ends of the flat tube being connected to the first header and the second header respectively; and fins, each disposed between adjacent flat tubes, extending in a corrugated shape along a length direction of the flat tube. The first header and the second header each have a slot running through a wall thereof and a protrusion arranged to an inner surface of the wall thereof. The protrusion includes an arc portion connected to the edge of the slot, and an extension portion protruding inwards from the arc portion. An arc radius of the arc portion is less than or equal to and greater than 0.6 times a thickness of a wall of the corresponding first header or second header.

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.

Producing welded connections between inner tubes and tube support plates of a tube bundle for a product-to-product shell-and-tube heat exchanger by means of an auxiliary device is described. A production method includes pressing the end face of a tube support plate against the end face of the inner tubes in the direction of the inner tube longitudinal axes during welding operations with a first form fit, which is effective both radially and axially, immovably fixing the number of inner tubes corresponding to the tube layout pattern to each other by a second, detachable form fit of the auxiliary device, making a circumferential round weld orbitally, starting from the plate inner bore and the tube inner bore, in a single pass and continuously from radially inside to radially outside, and detaching and removing the auxiliary device from the welded tube bundle.

A heat exchanger assembly includes a first member defining fluid passages therein for a first heat exchanger fluid. A second member defines fluid passages therein for a second heat exchanger fluid. The second member is engaged to the second member with an interference fit. A method of assembling a heat exchanger includes thermally resizing at least one of a first heat exchanger member and a second heat exchanger member and assembling the second heat exchanger member to the first heat exchanger member. The method includes thermally equalizing the first and second heat exchanger members to engage the second heat exchanger member to the first heat exchanger member with an interference fit.

A heat exchanger assembly includes a first member defining fluid passages therein for a first heat exchanger fluid. A second member defines fluid passages therein for a second heat exchanger fluid. The second member is engaged to the second member with an interference fit. A method of assembling a heat exchanger includes thermally resizing at least one of a first heat exchanger member and a second heat exchanger member and assembling the second heat exchanger member to the first heat exchanger member. The method includes thermally equalizing the first and second heat exchanger members to engage the second heat exchanger member to the first heat exchanger member with an interference fit.

The present disclosure provides a heat exchanger, including: a plurality of flat pipes, wherein, the plurality of flat pipes are arranged at intervals; first sealing cushion blocks, arranged between two adjacent flat pipes, wherein the first sealing cushion blocks are located on end portions of the flat pipes, so as to seal gaps between two adjacent flat pipes by means of the first sealing cushion blocks; and a flow collecting shell, provided with a first opening portion, wherein at least part of the first sealing cushion blocks and the end portions of the flat pipes are all plugged into the first opening portion, so that the flow collecting shell, the flat pipes and the first sealing cushion blocks form a flow collecting channel in an encircling manner.

The present disclosure provides a heat exchanger, including: a plurality of flat pipes, wherein, the plurality of flat pipes are arranged at intervals; first sealing cushion blocks, arranged between two adjacent flat pipes, wherein the first sealing cushion blocks are located on end portions of the flat pipes, so as to seal gaps between two adjacent flat pipes by means of the first sealing cushion blocks; and a flow collecting shell, provided with a first opening portion, wherein at least part of the first sealing cushion blocks and the end portions of the flat pipes are all plugged into the first opening portion, so that the flow collecting shell, the flat pipes and the first sealing cushion blocks form a flow collecting channel in an encircling manner.

The present invention relates to a pipe connection assembly of a heat exchanger for connecting a header tank and a pipe of the heat exchanger, in which a means for preventing a welding ring that fixes a manifold and a pipe from entering into a hollow at one end of the manifold before welding is disposed, and a space is formed between the inner surface of the one end of the manifold and the outer surface of the pipe, thereby preventing the molten welding ring from flowing out.