Provided is heat exchanger in which a rib of a core plate has a shape that is recessed from a flat surface of a flat body portion, and the rib is provided with: a rib bottom part including a bottom line that is recessed from and parallel to the flat surface of the flat body portion; and a rib inclination part that is positioned between the rib bottom part and a flat part. The rib is positioned so that the rib inclination part overlaps, in the tube stacking direction, the edge of the tube in the tube width direction.

A tube sheet having a circumferential edge region for connection to a lid of a collecting tank and having a base region with openings for receiving tube ends, the base region having webs provided between adjacent openings, the webs connecting the portions of the edge regions situated on the opposite longitudinal sides, at least one bead being provided which extends along the edge region and/or from the edge region with a limited extension only into a portion of a web.

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 corres-ponding fin hole (53) in a heat exchanger. The solution addresses the problem of expansion and assembly between a fin and a heat ex-change tube that is minute or has a small inner diameter without employing a brazing process, thus reducing manufacturing costs.

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.

A plate heat exchanger has openings in the plates defining supply and return ducts extending through a plate stack. The supply and return ducts are hydraulically connected to flow ducts located between the plates and to a tube arranged coaxially in each of the supply and return duct. The tubes have holes in the tube wall in order to provide the hydraulic connection to the flow ducts. A simple and cost-effective plate heat exchanger which can withstand high pressures is achieved by the tubes extending through the entire stack to form a tie rod between a top side and an underside of the plate stack. The tube has a diameter corresponding to the diameter of the openings in the plates such that the tube wall is firmly metallurgically connected to at least some edges of the openings.

A heat exchanger tube has a tube end having two extended portions substantially opposite the other around the periphery of the tube end, and two shortened portions, each positioned between the two extended portions and substantially opposite the other around the periphery of the tube end. The tube end may be formed by removing opposite portions of the tube by cutting a disc-shaped portion with a generally smoothly curving periphery along a major portion of the width of the tube. Each tube is oriented within an opening in the header wall of a heat exchanger assembly having a header portion integral with a tank portion, such that the tube end two extended portions are oriented substantially perpendicular to the direction of fluid flow within the header and the tube end two shorter portions are oriented substantially in the direction of fluid flow in order to reduce interference with fluid flow.

Problem to be Solved

To provide a heat exchanger that can increase the performance by setting an optimal number of tube groups in a configuration where each of the tube groups is provided with headers.

Solution

The number of arrays of tube groups of a core section 2 is set to three rows. The number N of heating medium flow holes 21 per tube is set for each width dimension Tw of tubes 20, and the tubes 20 are formed such that the width dimension Tw of the tubes and a flow channel cross-sectional area S satisfy a relationship of S1SS2. Therefore, the number of arrays of the tube groups in the core section 2 can be set to an optimal number of arrays for improving the endothermic capacity and reducing the weight, and sufficient refrigerant flow rate and pressure resistance can be secured. As a result, even when there is a restriction on the size of the entire heat exchanger, a light high-performance heat exchanger can be configured. This is significantly advantageous when the heat exchanger is used as an evaporator of a vehicle air conditioning apparatus for which a reduction in the weight of the components and an increase in the performance are demanded.

A piping connection system and method to connect a double pipe system such as a double pipe heat changer to a housing, for example a housing of a manifold. In examples, the piping connection system and method may include a transition member configured to bond or connect to the double pipe system and to the housing. In examples, the piping connection system may include a baffle configured to redirect flow from the housing to the double pipe system through an opening and towards the transition member. In examples, the piping connection system and method may be used to manufacture a quench exchanger such as a primary quench exchanger.

Modular tubing apparatuses for use in a shell-and-tube heat exchanger are described. Multiple apparatuses may be connected in series to form a high density, small tube diameter, long length tube apparatus assembly. Casting molds for forming modular tubing apparatuses are likewise described, including methods for casting such apparatuses.

A device for a heat exchanger has a hollow cylindrical header and a plurality of flat tubes. A wall of the header includes a plurality of through openings. The flat tubes are received in the through openings through the wall into the inner cross-section of the header tube, and are aligned with the width of the flat tubes parallel to the direction of the inner dimension. A width of the flat tubes is greater than an inner dimension of the inner cross-section and is smaller than the outer dimension of the header tube, wherein the through openings are embodied as having grooves that continue in the wall of the header tube into the inner cross-section. The flat tubes, which are guided in the through openings through the wall, are arranged in the grooves.