T.rad Co., Ltd.

Takuya Bungo

Atsushi Okubo

Taiji Sakai

Noriyuki Ishii

Kazuo Maegawa

Hirotaka Ueki

To mitigate thermal stress concentration in the vicinity of a flow-volume limiting portion in a stacked plate heat exchanger to thereby prevent fatigue breaking due to the same. The flow-volume limiting portion is also provided with opening portions that are similar to those in flow paths to reduce rigidity difference from flow path portions.

Stacked plate heat exchanger

To provide a plate laminate type heat exchanger that is capable to be temporarily fixed easily and surely before brazing assembly and can be fabricated with good accuracy. In a plate laminate type heat exchanger using a cladding material cladded with a brazing material, in each of laminated plates, a round hole penetrating in a laminate direction is formed; a thin and long fixing pin is inserted into the round hole so as to communicate each of plates; the fixing pin is fixed to the round hole by expansion of the outer diameter only at one end part in the longitudinal direction of the fixing pin; and each of plates is temporarily fixed integrally.

Plate laminate type heat exchanger

In a laminated core type heat sink in which a plate is formed by arranging a plurality of slits in parallel to a metal flat plate and by laminating the plate in large numbers, the thickness of a second plate positioned second in the lamination direction from an end lid to which a semiconductor is attached is made greater than thickness of a first plate other than the second plate.

Laminated core type heat sink

Conditions are found for a heat sink having the highest heat exchange performance on the basis of mutual relationship among thickness of each plate, slit pitch, and horizontal rib, in a laminated heat sink core in which numerous parallel slits are punched in a plate, slender vertical ribs are disposed therebetween and the plate is laminated.

Laminated heat sink core

A packing is held between a tank body and a header plate to secure sealing. Therewith, the width in a longer axis direction of an opening of a flat tube is wider and the width of the tank body is relatively narrow, resulting in a compact tank structure. A number of tooth parts protrude from the tank body at regular intervals, a tube end release part is formed between the tooth parts, and a side edge in a longitudinal axis direction of an opening of the flat tube is positioned therein. The tooth part, a flange part, a seal face of the header plate and a peripheral wall form a packing accommodation part, and a tip edge of the tooth part is seated on an edge of a convex part. The packing is arranged between the packing accommodation part and the seal face.

Heat exchanger and method for assembling same

A heat sink made from laminated plates and formed with spaced apart ribs and slits positioned so as to control circulation of refrigerant over the heat sink during cooling of an object by the heat sink.

Laminated heat sink

A corrugated fin heat exchanger is provided in which the direction in which louvers are cut and raised is inclined in one direction only, and in which heat transfer performance is improved above that of conventional fins. To accomplish this, the relationship H&#x3e;Qup/(Qup&#x2212;1)&#xd7;&#x394;H is satisfied. H represents the core height of the heat exchanger, Qup represents the ratio of the amount of heat exchanged per corrugation between one-directional louver fins and multi-directional louver fins in an airflow part, and &#x394;H represents the amount of increase in a heat transfer reduction region of a heat exchanger core as a result of changing from multi-directional louver fins to one-directional louver fins.

Heat exchanger core

In order to prevent deformation of a side member due to thermal stress in a heat exchanger in which water for cooling a high-temperature body circulates, a side member is formed in the shape of a groove, the cross section of which has side wall parts and a base part along the entire length in the lengthwise direction of a main body part, and both ends of the side member in the lengthwise direction are provided with a stepped part, which is formed as a step toward the outside of a core, and one or more brace-like ribs, which integrally connect the tip end and the base part of the stepped part in a slanting manner.

Heat exchanger

In order to improve sealing performance when the open end of a tank is swaged and thereby secured inside an annular groove the surface of which is formed in a substantially rectangular shape with a seal material between the groove an the tank, flange parts protrude in a fan shape at the four corners of the seal material, and those flange parts are pressed by the corner sections of the annular groove, thereby preventing the seal material from moving in the corner sections.

Seal structure for tank

Corrugated fins that have high heat transfer performance and do not cause clogging even in a gaseous environment in which particulate matter such as dust is present have wall surfaces on which are formed alternating parallel ridges and furrows with an angle of inclination of 10-60&#xb0;. Defining Wh as the height of the ridges and furrows, Wp as the period of the ridges and furrows, Pf as the period of the corrugated fins, and Tf as the thickness of the plate forming the fins, the following conditions hold.&#x2264;0.36741.8930.1584,0.088&#x3c;()/&#x3c;0.342, and2+where=0.004&#xb7;&#x2212;0.0696&#xb7;0.36420.0036&#xb7;0.0625&#x2212;0.5752, and=0.0007&#xb7;+0.1041&#xb7;+0.2333.

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Tokyo, Japan

Takuya Bungo