Nippondenso Co., Ltd.

Denso Corporation

Nihon Parkerizing Co., Ltd.

Furukawa Aluminum Co., Ltd.

Toshio Ohara

Yoshiyuki Yamauchi

Isao Kuroyanagi

Yoshiharu Kajikawa

Masahiro Shimoya

Yasukazu Aikawa

Yasushi Yamanaka

Kenichi Fujiwara

Masamichi Makihara

Norimasa Baba

Keiichi Yoshii

Sadayuki Kamiya

Etuo Hasegawa

Shinji Ogawa

Toshio Takahashi

Yoshiaki Takano

Nobuharu Kakehashi

Shin Nishida

Takao Ogino

Eiichi Torigoe

Michiyasu Yamamoto

Hisayoshi Sakakibara

Etsuo Hasegawa

Shigeo Numazawa

Yoshio Miyata

Hideaki Kaneko

Keiichi Kitamura

Mikio Fukuoka

Yoshifumi Aki

Mitsugu Nakamura

Ryosuke Sako

Kiyoshi Kittaka

Hiroyuki Sato

Kiyomitsu Tsuchiya

Masayoshi Nishikawa

Shinji Naruse

Yosiharu Kajikawa

Toshihiro Yamamoto

Yutaka Murakami

Yoshiharu Hasegawa

Euto Hasegawa

Yoshiharu Kazikawa

Sigenobu Fukumi

Yasuhiro Sudo

Tutomu Niwa

An evaporator includes a flat tube extending in a vertical direction and having a drain groove for guiding condensed water downward, at a middle portion thereof in an air flow direction. A corrugated fin joined to the tube is divided by a gap portion into an air upstream side first fin and an air downstream side second fin. The gap portion faces the drain groove of the tube. Accordingly, condensed water produced at the air upstream side first fin can be smoothly discharged from the evaporator through the drain groove.

Refrigerant evaporator with condensed water drain structure

An evaporator has plural tubes arranged in parallel with each other in a width direction perpendicular to an air flowing direction. The tubes are further arranged in a plural rows in the air flowing direction, and tank portions extending in the width direction are arranged in the plural rows in the air flowing direction to correspond to the tubes. In the evaporator, refrigerant flows through a zigzag-routed refrigerant passage formed by the tank portions and the tubes. A partition wall defining adjacent two tank portions in the air flowing direction has plural bypass holes through which the adjacent two tank portions directly communicate with each other. Therefore, the zigzag-routed refrigerant passage of the evaporator is readily formed without an additional side passage or the like. Thus, the number of components of the evaporator is reduced thereby simplifying the structure of the evaporator, and pressure loss of refrigerant flowing in the evaporator is decreased.

Refrigerant evaporator and manufacturing method for the same

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

A laminated type heat exchanger includes a plurality of tube elements laminated so as to form a first tank portion, a second tank portion, and a third tank portion in a laminated direction. Each tube element includes a first flange, a second flange, and a third flange for the first tank portion, the second tank portion, and the third tank portion, which are brazed with a first flange, a second flange, and a third flange of an adjacent tube element, respectively. The first flange is folded inside the first tank portion, the second flange is folded outside the second tank portion, and the third flange is folded outside the third tank portion. In this way, it is possible to reduce the flow resistance of the refrigerant flowing in the tank portions.

Laminated type heat exchanger having small flow resistance

A laminated type heat exchanger includes a plurality of refrigerant passages which are formed by pairs of core plates. Each core plate comprises an outer covering layer, a core layer, and an inner covering layer. The outer covering layer is made of a brazing material of which electric potential is more negative than the core layer while the inner covering layer is made of a brazing material of which electric potential is equal to or more positive than the core layer. The refrigerant passages are formed by brazing only the adjacent two of the inner covering layer. The outer covering layer works as a sacrificial corrosive material with respect to the inner covering layer and the core layer. Leakage of refrigerant from the brazed portions of the core plates is prevented, whereby the corrosion resistance of the laminated type heat exchanger is improved.

Laminated type heat exchanger

An evaporator capable of improving heat-exchange efficiency by enhancing performance to distribute refrigerant to many refrigerant passages of a refrigerant distribution pipe from a throttle. The evaporator is capable of suppressing the occurrence of a refrigerant passing noise by the throttle while maintaining the throttle of a nozzle at a certain size as to be able to function as a throttle. The inner diameter of the throttle in the nozzle is made as large as possible. The cross-sectional center of the throttle of the nozzle is off-centered toward the upper side relative to the cross-sectional center of the refrigerant distribution pipe inserted into the inlet tank of the evaporator. The refrigerant flows out of the throttle in a mixed condition of liquid and gas, and separation of gas and liquid in the refrigerant is alleviated inside the refrigerant distribution chamber. The refrigerant flowing out of the throttle of the nozzle can easily flow into the upper side of the refrigerant distribution pipe rather than the lower side. Thus, the performance of refrigerant distribution from the throttle to many refrigerant passages of the refrigerant distribution pipe is improved.

Refrigerant evaporator

An amount of refrigerant fed to an evaporator 16 is adjusted by an open degree of an expansion valve 6 in accordance to a refrigerant pressure and a refrigerant temperature of an outlet side of the evaporator 16. The evaporator 16 has an evaporation part which includes a refrigerant passage 26 connecting parallel with an inflow passage 22 and an outflow passage 24 and further having a cooled passage 28 which forms a first throttle 30 at the downstream thereof and a cooling passage 32. The cooled passage 28 links the expansion valve 6 and the inflow passage 22. The cooling passage 32 is connected to the outflow passage 24 and leads refrigerant to an outlet. A heat exchange part 20 is provided to be able to of performing heat exchange between the cooled passage 28 and the cooling passage 32. A second throttle is set in a bypass passage 38 which links the upstream side of the cooled passage 28 and the downstream side of the first throttle 30.

Evaporator for cooling units

A refrigerant evaporator for a refrigeration cycle which separates a refrigerant of a two-phase gas and liquid state introduced from a pressure reduction means into a liquid refrigerant and a gas refrigerant by a gas and liquid separation means and distributes at least the liquid refrigerant to a plurality of refrigerant passageways of a heat exchange portion by a distribution means such as a tank. The distributed refrigerant has a single phase such as a liquid refrigerant and therefore the distribution is uniformly and equally carried out, the efficiency of the evaporator becomes higher, and the size can be reduced.

A refrigerant evaporator for a refrigeration cycle provided with a heat exchanging unit, comprising a passageway to be cooled and a cooling passageway, and an evaporating unit for cooling the air, wherein a part of the inflowing refrigerant is divided, passed through a throttle to be reduced in pressure, and then passed through the cooling passageway of the heat exchanging unit, the inflowing refrigerant passing through the passageway to be cooled is cooled and completely changed to the liquid state and then passed into the evaporating unit, whereby the refrigerant is uniformly distributed to a plurality of refrigerant passageways of the evaporating unit.

A laminate-type heat exchanger having a plurality of component plates each having a flange and projection formed along the circumference thereof, raised portions and hollowed portions formed at both ends of an area surrounded by the projection and which define together reservoirs, respectively, and an intermediate wall formed in an area except for the raised and hollowed portions and which has a height equal to half of the flange and raised portions, the plates adjacent at one side being laminated one on another with one side of the plate set opposite to the same side of the adjacent one and brazed to each other at their respective flanges and hollowed portions while the plates adjacent at the other side being laminated one on another are brazed to each other at their respective projections and raised portions.

Laminate-type heat exchanger

A refrigeration system for use in an automotive air conditioner comprises a compressor for compressing vapor-phase refrigerant, a condenser connected to the outlet of the compressor, an expansion valve connected to the outlet of the valve, and a vapor pressure-adjusting valve mounted in the passage extending from the evaporator to the compressor. When the vapor pressure inside this passage is less than a certain value, the adjusting valve reduces the flow of refrigerant from the evaporator to the compressor to maintain the vapor pressure constant. A part of the liquid-phase refrigerant on the downstream side of the condenser is added to the refrigerant evaporated by the evaporator, by means of the adjusting valve.

Vapor pressure-adjusting valve and refrigeration system using same

A heat exchanger for using an evaporator of an automotive air conditioner comprises a plurality of tube units and a plurality of corrugated fins. A pair of plates are connected each other for forming the tube unit. The plate has an elongating portion at an outer peripheral of the connecting portion at which one plate is connected to another plate. The elongating portion elongates from the connecting portion to the corrugated fin, but there exists some gap between the elongating portion and the corrugated fin. So that a draining space is formed within the connecting portion and the elongating portion of the plate and the corrugate fin. Since no surface tension is occurred between the elongating portion and the corrugated fin, the condensed water introduced into the drawing space can be drained effectively.

Plate type heat exchanger

A heat exchanger has special usage such as an evaporator of an automotive air conditioner. This heat exchanger can improve wettability and can reduce a scattering of condensed water. This heat exchanger is treated by a special chemical conversion treatment so that this heat exchanger has two layers of coating on the surface thereof. One of the two layers is a chemical conversion coating formed on the surface of the heat exchanger. The other one is a resin coating formed over the chemical conversion coating. The chemical conversion coating is treated by immersing the heat exchanger into a water solution. The resin coating is also treated by immersing the heat exchanger having the chemical conversion coating into a water solution of organic high polymer material.

Aluminum heat exchanger and method for producing aluminum heat exchanger

A method of producing a lightweight and corrosion-resistant heat exchanger is disclosed. An aluminum tube with a plurality of passage bores therein is formed by extrusion. A layer of a brazing material comprising an aluminum alloy having an electrode potential value lower than that of the tube material is formed on the tube surface with the aid of a non-corrosive flux. The tube is bent into a zigzag winding form so as to have a plurality of substantially parallel runs. Corrugated fin members of aluminum or aluminum alloy are placed between respective adjacent runs of the tube. The tube and the fin members are heated together up to the melting point of the brazing material so that they are bonded together by the brazing material to form the heat exchanger.

Process of producing lightweight and corrosion-resistant heat exchanger

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Kariya, Japan

Toshio Ohara