Denso Corporation

Nippondenso Co., Ltd.

Yoshifumi Aki

Mikio Fukuoka

Michiyasu Yamamoto

Etuo Hasegawa

Ryouichi Sanada

Toshio Ohara

Isao Kuroyanagi

Hiroki Matsuo

Naoki Sugimoto

Tetsuji Nobuta

Sadayuki Kamiya

Mitsugu Nakamura

Hiroyuki Sato

Shinji Naruse

Ryuji Morishita

Eiji Okabayashi

Mitsukawa Kazuhiro

A tube inside passage height (Tr) is set within a range of 0.35&#x2013;0.8 mm. Thereby, sum of radiation performance reduction due to pressure loss inside tube and radiation performance reduction due to air flow resistance is reduced, thereby attaining high radiation performance. Especially, when the tube inside passage height (Tr) is set within a range of 0.5&#x2013;0.7 mm, the radiation performance is further improved.

Refrigerant condenser used for automotive air conditioner

A tube inside passage height (Tr) is set within a range of 0.35-0.8 mm. Thereby, sum of radiation performance reduction due to pressure loss inside tube and radiation performance reduction due to air flow resistance is reduced, thereby attaining high radiation performance. Especially, when the tube inside passage height (Tr) is set within a range of 0.5-0.7 mm, the radiation performance is further improved.

In a receiver-integrated condenser, a super-cooling portion for cooling liquid refrigerant from a receiving unit is disposed between first and second condensing portions in a core portion in a vertical direction. Therefore, in an engine-idling, even when high-temperature air having passed through the receiver-integrated condenser is introduced again toward an upstream air side of the receiver-integrated condenser through a lower side of the receiver-integrated condenser, the high-temperature air is not introduced toward the arrangement position of said super-cooling portion, because the super-cooling portion is positioned at an upper side from the second condensing portion. Thus, super-cooling performance of refrigerant in the super-cooling portion of the core portion is prevented from being decreased even in the engine idling.

Receiver-integrated condenser

A heat exchanger has a header tank, plural tubes through which refrigerant flows and a connector for connecting the tank to a pipe. The header tank has a pair of protruding portions protruding from an outer surface of the header tank and integrally formed with the header tank. When the connector is bonded to the tank by brazing, the connector is disposed between the protruding portions, and each of the protruding portions is bent toward the other at a protruding end thereof by plastic deformation. As a result, the connector is clamped by the protruding portions and is fastened to the header tank. Thus, the connector is readily and tentatively fastened to the header tank before bonded to the header tank by brazing.

Heat exchanger for vehicle air conditioner

A double heat exchanger including a radiator and a condenser for an air conditioner is mounted on a vehicle through first and second brackets. When the radiator is detached from the vehicle, a bolt for securing a side plate of the radiator to the second bracket is removed firstly, and the radiator is inclined in a front-rear direction of the vehicle. Thereafter, the radiator is pulled upwardly to be detached from the first bracket. When the radiator is attached to the vehicle, a first extending portion of the side plate of the radiator is inserted between first and second holding portions of the first bracket. In this state, the radiator is moved to contact an inclining member of the first bracket, and is fastened to the second bracket through the bolt. Thus, the radiator is readily detached from and attached to the vehicle and requires a small mounting space.

A core unit of a heat exchanger is composed of a plurality of parallel flat tubes, a plurality of corrugated fins, a support member disposed between two of the corrugated fins and an electric heater disposed inside the support member. The support member has a pair of parallel plates bonded to the corrugated fins at the summits of corrugation of the corrugated fins. The electric heater is composed of a heating element and an insulation member inserted between the heating element and the parallel plates.

Core unit of heat exchanger having electric heater

An aluminum heat exchanger includes laminated aluminum tubes and corrugated fins, a core portion receiving respective ends of tubes into sheet metals members, and iron or stainless steel inserts having high strength receiving U-shaped folded pieces of the sheet metal members contacting the corrugated fins at the outermost portion of the core portion. The tubes and the corrugated fins are held and pressed from both sides of the core portion by the inserts and the corrugated fins are protected from coming apart during a brazing operation.

Aluminum heat exchanger

A heat exchanger includes a tank and a base plate, and each of the tank and the base plate is formed in a box shape having a U-shaped cross-section. The tank is connected to the base plate to close an end portion of an opening side of the tank using the base plate. Protrusion portions are provided inside a folded portion of the base plate in a lateral direction to be opposite to connection portions of first and second folded portions of the tank. Further, ribs are provided in the folded portion of the base plate in the lateral direction to increase stiffness of the base plate in a longitudinal direction thereof. Thus, connection portions of the tank and the base plate can be securely brazed.

Heat exchanger

A heat exchanger reduces a production of scrap portions and does not use a claw bending process at a time of forming a tank and a base plate. Each of the tank and the base plate is formed in a box shape having a U-shaped cross-section. The tank is joined to the base plate to close an end portion of an opening side of the tank using the base plate. A tube is inserted into a hole made at the base plate and fixed thereat in such a manner that the tube communicates with an inside of the tank. Each of the tank and the base plate is formed by folding an unfolded metal plate in which the box shape having the U-shaped cross section is in an unfolded state and joining a folded portion of the unfolded metal plate by brazing. According to the above configuration, the tank and the base plate can be structured by folding unfolded plates and by connecting the folded portions.

Heat exchanger and method for manufacturing the same

A heater core of a construction which is easy to produce by a molding process, while providing a desired sealing effect with respect to its casing. The heater core 20 is formed by a pair of tanks 28 and a heat exchanging section 27 arranged between the tanks 28. The heat exchanging section 27 is formed by a pair of top and bottom support plates 33 and stack of heat exchanging tubes 31 and fins 32 arranged alternately. The top and bottom supporting plates 33 have a width with is equal to the width of tanks 28, so that end surfaces of the support plates 33 are located on the same plane with respect to outer surfaces of the tank 28 in the direction of the flow of the air contacting with the heat exchanging section 27.

Heat exchanging apparatus

According to the present invention, in a corrugated fin type heat exchanger including a core portion having a plurality of flat tubes disposed in parallel relation with regard to a flow direction of air and at least one corrugated fin disposed between each pair of the flat tubes, a height of a flow space within the flat tube is in a range of 0.6-1.2 mm, a height of the corrugated fin is in a range of 3-6 mm, and a ratio (St/W.times.D) of the cross-sectional area (W.times.D) expressed by an overall width dimension (W) and a thickness dimension (D) of the core portion to a total cross-sectional flow passage area (St) of the plurality of flat tubes is set to a range of 0.07-0.24 according to the height of the flow space of the flat tube and the height of the corrugated fin. In this way, it is possible to reduce the Reynold's number of the flow passages within the flat tubes to maintain a constant region irrespective of the variation in the hot water flow quantity, thereby reducing the variation in the water side heat transfer rate.

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Kariya, Japan

Yoshifumi Aki