A heat exchanger includes a heat exchange plate, and the heat exchange plate includes a base plate, and a first protrusion and a second protrusion protruding towards a first direction. The back surfaces of the first protrusion and the second protrusion form a first groove and a second groove. The maximum width of the orthographic projection of the first groove on a second side surface of the base plate is ?1, and the maximum width of the orthographic projection of the second groove on the second side surface of the base plate is ?2, the depths of the first groove and the second groove relative to the second side surface of the base plate are Dp1 and Dp2 respectively, the thicknesses of the protrusion tops of the first protrusion and the second protrusion are h1 and h2 respectively, where ?0.05 mm?(h1+DP1)?(h2+DP2)?0.05 mm, and DP1>DP2, ?1<?2.

Provided are a layered heat exchanger that can prevent deterioration of sealing property due to deformation of sealing portions of inlet and outlet header sections when a PTC heater is sandwiched between flat heat exchanger tubes, and is pressed to be brought into close contact with the flat heat exchanger tubes, and a heat medium heating apparatus and a vehicle air-conditioning apparatus using the layered heat exchanger.

A first heat exchanger plate includes: an inlet header formed by a first opening; an outlet header formed by a second opening; and a plurality of partition walls disposed between the inlet header and the outlet header so as to partition a flow path for a fluid from the inlet header toward the outlet header into a plurality of parallel flow paths. At least one partition wall among the plurality of partition walls includes at least one notch. A pair of the parallel flow paths on both sides of the partition wall having the notch connect with each other via the notch. A first distance between the inlet header and the at least one notch in a flow direction of the fluid is less than a second distance between the outlet header and the at least one notch in the flow direction.

A heat exchanger includes a stack of channel plates including first and second channel plates alternately stacked on one another such that fluids A and B are heat-exchanged each other. The first channel plate has a fluid path for fluid A on one surface thereof, wherein inflow and outflow parts for fluid A are formed on the fluid path for fluid A, and the second channel plate has a fluid path for fluid B intersecting with the fluid path for fluid A on one surface thereof. The first channel plate has communicating structures corresponding to the inflow and outflow parts for fluid B. The heat exchanger also includes an upper plate section attached to an upper surface of the stack, and a lower plate section attached to an undersurface of the stack.

A heat exchanger includes: each of the fin plates having a V shaped or trapezoid corrugated shape, and including top walls positioned at top portions of the corrugated shape, bottom walls positioned at bottom portions of the corrugated shape, and foot portions each connecting one of the top walls and one of the bottom walls, each of the foot portions having a rectangular corrugated shape along one of the top walls and one of the bottom walls, and including stepped walls formed at a predetermined interval along the one of the top walls and the one of the bottom walls, and opening portions each formed in one of the stepped walls, and being an elongated through holes having a width equal to or smaller than a thickness of one of the fin plates.

A core unit 1 of a heat exchanger includes a plurality of core plates that are stacked on one another to alternately constitute oil passages 10 and cooling water passages 11, in which oil that is heat-exchanged in the core unit 1 is guided to an outlet port 23 after passing through a top connecting passage 18 and an oil outlet passage L3, and in which part of the oil is led from a lower end of an upper/lower oil passage L2 is guided to the outlet port 23 through an auxiliary passage 24, so that the amount of oil flowing in the oil outlet passage L3 is reduced thereby reducing a passage resistance.

A heat exchanger configured to cause a refrigerant to exchange heat with a heat medium, includes: plates stacked on top of one another. A first flow path and a second flow path are formed between the plates. The refrigerant in a two phase state flows through the first flow path and the heat medium flows through the second flow path. Each of the plates includes: a first inlet from which the refrigerant flows into the first flow path; and a first outlet from which the refrigerant flows out of the first flow path. In each of the plates, when viewed in a direction in which the plates are stacked, the first inlet has line symmetry with respect to a center line in a width direction of the each of the plates, and the first outlet has line symmetry with respect to the center line.

A plate heat exchanger includes a plurality of first heat transfer plates, a plurality of first inner fins, a plurality of second heat transfer plates, and a plurality of second inner fins. A space is formed between each of the plurality of first heat transfer plates and a corresponding one of the plurality of second heat transfer plates. The plate heat exchanger includes, in the space, a plurality of heat transfer components connecting each of the plurality of first heat transfer plates and a corresponding one of the plurality of second heat transfer plates, the plurality of heat transfer components being interspersed between each of the plurality of first heat transfer plates and a corresponding one of the plurality of second heat transfer plates. A recess-and-projection pitch section in each of the plurality of first inner fins includes first pitch sections and one or more of second pitch sections, a width of each of the second pitch sections being wider than a width of each of the first pitch sections. The plurality of heat transfer components are disposed in regions of the first pitch sections when the plurality of heat transfer components are projected in a direction in which the plurality of first heat transfer plates and the plurality of second heat transfer plates are stacked.

A thermal device according to the present disclosure includes a ceramic container, a fluid, and a sealing portion. The container includes an internal space, an opening portion connected to the internal space, and a communication path configured to connect the internal space and the opening portion. The fluid is located in the internal space. The sealing portion blocks the opening portion. The sealing portion includes a core portion and a flange connected to the core portion. The flange is bonded to the container around the opening portion. The core portion is located inside the opening portion. A portion of the core portion is in contact with the wall surface of the opening portion.

A plate heat exchanger includes a number of first heat exchange plates and a number of second heat exchange plates. The plate heat exchanger has a first inter-plate channel and a second inter-plate channel. The first inter-plate channel is located between a front surface of the second heat exchange plate and an adjacent first heat exchange plate. The second inter-plate channel is located between a back surface of the second heat exchange plate and another adjacent first heat exchange plate. The first heat exchange plate has a first flat joint portion and a second flat joint portion. The front surface of the second flat joint portion is spaced apart from an adjacent first flat joint portion. The plate heat exchanger includes at least one connection portion connecting the front surface of the second flat joint portion and the adjacent first flat joint portion.