Nippondenso Co., Ltd.

Denso Corporation

Yoshiharu Kajikawa

Toshio Ohara

Yasukazu Aikawa

Masahiro Shimoya

Eiichi Torigoe

Etsuo Hasegawa

Isao Kuroyanagi

Norimasa Baba

Shinji Ogawa

Toshihiro Yamamoto

Yoshiaki Takano

Yasushi Yamanaka

Nobuharu Kakehashi

Kenichi Fujiwara

Shin Nishida

Yoshiyuki Yamauchi

Takayuki Morita

Toshiya Nagasawa

Fumiaki Nakamura

Suehiro Okazaki

Shinichi Inagaki

Shogo Sumi

Akio Hirano

Hideo Harada

Yasuhiro Ando

Atsushi Yazawa

Yasuaki Tsukagoshi

Shokichi Fukuoka

In a heat exchanger having a side plate for reinforcing a core portion, after an elastic support member for supporting the core portion is inserted between opposite walls of the side plate, a part of the opposite walls having a slit portion is plastically deformed at a position around the slit to form a protrusion. The protrusion protrudes toward the support member to be engaged with a recess of the elastic support member. Further, the silt is provided to penetrate through each opposite wall without being opened to an outer peripheral end of the side plate. Accordingly, the support member can be readily attached to the side plate, while it can prevent the side plate from being deformed in a brazing.

Heat exchanger having attachment structure of elastic support member

A core plates forming a core body includes an upstream refrigerant passage for communicating an upper and a lower tank disposed at a downstream side and a downstream refrigerant passage for communicating an upper and a lower tanks disposed at an upstream side with respect to the air flow direction. Ribs are formed on an inner surface of the upstream refrigerant passage to agitate the refrigerant, and inner fins are provided on the inner surface of the downstream refrigerant passage which receives a refrigerant after passing through each the upstream refrigerant passage of each the core body.

Refrigerant evaporator

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

A refrigerant evaporator has, at each of a downstream side and an upstream side with respect to a flow direction of air, a pair of upper and lower tanks and a tube connecting the tanks. A refrigerant flows from the pair of tanks and the tube at the downstream side to the pair of tanks and the tube at the upstream side to cool the air flowing outside the tubes. The tanks at the upstream side are formed in an elliptic shape in cross section and the tanks at the downstream side are formed in a circular shape in cross section. The shorter diameter of the elliptic shape lies in a longitudinal direction of the tubes and is the same as the diameter of the circular shape.

Refrigerant evaporator having upstream and downstream tanks of different

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.

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 drain case 4 is disposed between the bottom wall of a unit case and the lower end of refrigerant passage pipes 15 of a stacked type refrigerant evaporator. The drain case 4 is W-shape in cross section, and comprising two pieces of outside inclined walls 32 contacting the side ends of two pieces of tank parts 16 and 17 formed at the lower end side of the refrigerant passage pipes 15, a chevron type protruded wall 33 contacting a recessed part 28 formed at the bottom end of the part between the adjacent two pieces of tank parts 16 and 17, and inside inclined walls 34 having a drain hole 36. In this arrangement, the condensed water flows from the side ends of the two pieces of tank parts 16 and 17 and the part between the two pieces of tank part 16 and 17 into the lower ends thereof reaches the two pieces of outside inclined walls 32 and protruded wall 33 of the drain case 4 before reaching the bottom end of the two pieces of tank parts 16 and 17, and then is efficiently drained therefrom. Localized corrosion that may occur at the lower end part of refrigerant passage pipes is prevented by not allowing the condensed water to stay at the lower end side of the refrigerant passage pipes.

Cooling unit and drain case for air conditioners

A heater core supplied with hot water by a cooling water recirculating passageway of an internal combustion engine, and having a plurality of parallel tubes arranged between first and second tanks. The heater core forms a first cooling water flow circuit for creating a U-shaped flow whereby the cooling water from the first tank is introduced into the second tank via a group of tubes and then introduced into the first tank via a different group of tubes, and a second cooling water flow circuit for creating a straight flow from the first tank and second tank. A flow switching valve is provided and is usually switched to the first cooling water flow circuit. Upon a drop in the engine rotational speed to an idling speed, wherein the amount of hot water supplied to the heater core is small, the second cooling water flow circuit creating a one-directional flow from the first tank to the second tank is selected, whereby the flow resistance is lowered, and accordingly, the amount of heat emitted from the heater core increased, to thus maintain a desired heating performance during the engine idling condition.

Hot water type heat exchange device

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

Growing community of inventors

Hekinan, Japan

Yoshiharu Kajikawa