Mitsubishi Heavy Industries Limited

Other

Masashi Inoue

Koji Nakado

Katsuhiro Saito

Akira Yoshikoshi

Yoshinori Watanabe

Atsushi Suzuki

Naoki Toda

Manabu Nomura

Tomoyuki Inui

Fumio Kondoh

Hirofumi Gouda

Shin Watabe

Hiroshi Iokawa

Kazuhiro Suzuki

Matsuo Sakuma

Kiyoto Yasui

Yujiro Anai

Hiroyuki Kotou

The invention has as an object providing a two-block heat exchanger that can improve the heat exchange capacity by distributing the refrigerant evenly in the refrigerant path. The invention is a two-block heat exchanger, and the refrigerant distribution part provides two separate refrigerant paths Rand Rthrough which the refrigerant flows and an opening provided at both of the respective ends of these refrigerant paths Rand RAmong the two refrigerant paths Rand Rthe open end of the space Sout(refrigerant circulation space) on the exit side formed by the one opening of the one refrigerant path Ris connected to the open end of the space Sin(refrigerant circulation space) on the entrance side formed by one opening of the other refrigerant path RAfter the refrigerant flows into the refrigerant path Rof each refrigerant distribution part, and refrigerant flows through the refrigerant path Rof each of the refrigerant distribution parts.

Heat exchanger

A heat exchanger employing a dimple tube is disclosed, in which sufficient strength is provided by improving the processing accuracy of the dimple tube and decreasing the processing error. The tube comprises a plate folded in two so as to make two edges of the plate contact each other and form a flat tube. The plate comprises protrusions provided on each inner wall of the flat tube in a manner such that the heads of opposed protrusions on both the inner walls contact each other. The plate is clad with a brazing filler metal and the protrusions are formed on a surface of the plate before the plate is folded, and the two edges of the plate and the heads of the opposed protrusions are respectively brazed after the plate is folded. A predetermined number of sets of the opposed protrusions, positioned closest to the end of the tube, are larger than the other protrusions in a manner such that their size along the longitudinal direction of the tube is larger.

Heat exchanger and dimple tube used in the same, the tube having larger opposed protrusions closest to each end of tube

The present invention relates to a heat exchanger in which a plate-shaped refrigerant flow portion which provides an internal refrigerant flow path by overlaying two flat plates formed by drawing and a cooling fin are alternately layered; and comprising an opening portion provided on each of the flat plates and which is connected with the refrigerant flow path; and a continuous space for the flow of the refrigerant which is provided by connecting the opening portions of adjacent refrigerant flow portions. The refrigerant which flows in the space is distributed to the respective refrigerant flow paths through the opening portions. The heat exchanger further comprises a means for improving the heat exchange capacity, and this means is, for example, a narrowing means which is provided at the upstream end part of the space in order to uniformly distribute the refrigerant to the refrigerant flow paths.

The present invention relates to a heat exchanger in which a plate-shaped cooling medium flow portion ( ) provides an internal cooling medium flow path inside by laminating two flat plates ( ) subjected to drawing and a cooling fin are alternately laminated, a cooling medium inlet ( ) for allowing a cooling medium to flow into the cooling medium flow path and a cooling medium outlet ( ) for allowing the cooling medium passing through the cooling medium flow path to flow out are formed in said two flat plates, and the cooling medium flowing from the cooling medium inlet to the cooling medium flow path is passed through said cooling medium flow path and is then allowed to flow out of the cooling medium outlet. According to the present invention, a bulged portion ( ) protruding on the cooling medium flow path side is formed in the cooling medium flow portion by denting at least any one of these two flat plates from the outside, and a plurality of elliptical or oval cylindrical portions whose major diameter is oriented in the flow direction of the cooling medium are provided between these two flat plates by butting the top portion of this bulged portion to the opposite flat plate. Additionally, the number of the cylindrical portions is gradually decreased as the cooling medium flows downstream in the flow direction of the cooling medium.

A method for injection-molding a plastics propeller fan by using a fixed-side mold section and movable-side mold section, comprises the steps of providing a movable core at an area corresponding to a thicker portion of a blade section of the propeller fan; after a predetermined amount of plastics material has been injected into a blade space of a mold cavity defined by the fixed-side mold section, movable-side metal section and movable core and conforming to the propeller fan, pushing out the movable core into the mold cavity and, after this step, bringing the movable core back to a normal position conforming to a mold shape defining the blade space and forming a proper fan.

Method for injection-molding a propeller fan

A laminated type heat exchanger including a refrigerant inlet tank and a refrigerant outlet tank. The inlet tank has inlet chambers and a refrigerant passage passing through the inlet chambers, and the outlet tank has outlet chambers and a refrigerant passage passing through the outlet chambers. The heat exchanger includes refrigerant pipes each having one end which is connected to the inlet chamber and the other end which is connected to the outlet chamber, and a refrigerant gate portion for flowing the refrigerant into the inlet tank and from the outlet tank. The heat exchanger also includes a dispersion pipe which is inserted in the inlet tank refrigerant passage. The dispersion pipe is about &frac13; to &frac14; of the length of the inlet tank refrigerant passage, and the sectional area of the dispersion pipe is smaller than that of the inlet tank refrigerant passage. Dispersion holes are formed at the opposite side of the dispersion pipe against the refrigerant pipe, and the size of the dispersion holes increases with the increase in the distance from the gate portion.

Laminated type heat exchanger

A heat exchanger tube, which has a high pressure resistance, includes a tube body, wherein the interior of the tube body defines a fluid flow passage. The inner and outer surfaces of the tube body of the heat exchanger tube defines heat entrance and exit surfaces for the fluid. The tube body of the heat exchange tube has first and second wall portions which are opposed to each other. Either the first wall porition has a plurality of bowl-shaped bulging wall portions which bulge toward the direction of the second wall portion to fixedly meet the second wall portion or else both the first and second wall portion both have a plurality of bowl-shaped bulging wall portions which are correspondingly located so that a bulging leading end of a bowl-shaped bulging wall portion in a first wall portion bulges toward and fixedly meets a bulging leading end of a bowl-shaped bulging wall portion in the second wall portion which bulges toward the first wall portion.

Heat exchanger tube

A heat exchanger is constructed by tubes, corrugated fins and head pipes, which are assembled together. Herein, the tube is constructed by bending a flat plate whose surfaces are clad with brazing material to form a first wall and a second wall, which are arranged opposite to each other with a prescribed interval of distance therebetween to provide a refrigerant passage. Before bending, a number of swelling portions are formed to swell from an interior surface of the flat plate by press. By bending, the swelling portions are correspondingly paired in elevation between the first and second walls, so their top portions are brought into contact with each other to form columns each having a prescribed sectional shape corresponding to an elliptical shape or an elongated circular shape each defined by a short length and a long length. The columns are arranged to align long lengths thereof in a length direction of the tube corresponding to a refrigerant flow direction such that obliquely adjacent columns, which are arranged adjacent to each other obliquely with respect to the length direction of the tube, are arranged at different locations and are partly overlapped with each other with long lengths thereof in view of a width direction perpendicular to the length direction of the tube. The tubes, corrugated fins and head pipes are assembled together and are then placed into a heating furnace to heat for a prescribed time.

A heat exchanger employing a dimple tube in which sufficient strength is provided by improving the processing accuracy of the dimple tube and decreasing the processing error. The tube includes a plate folded in two so as to make two edges of the plate contact each other and form a flat tube. The plate comprises protrusions provided on each inner wall of the flat tube in a manner such that the heads of opposed protrusions on both the inner walls contact each other. The plate is clad with a brazing filler metal and the protrusions are formed on a surface of the plate before the plate is folded, and the two edges of the plate and the heads of the opposed protrusions are respectively brazed after the plate is folded. A predetermined number of sets of the opposed protrusions, positioned closest to the end of the tube, are larger than the other protrusions in a manner such that their size along the longitudinal direction of the tube is larger.

The present invention relates to a heat exchanger in which a plate-shaped cooling medium flow portion (,) provides an internal cooling medium flow path inside by laminating two flat plates (,) subjected to drawing and a cooling fin are alternately laminated, a cooling medium inlet (,) for allowing a cooling medium to flow into the cooling medium flow path and a cooling medium outlet (,) for allowing the cooling medium passing through the cooling medium flow path to flow out are formed in said two flat plates, and the cooling medium flowing from the cooling medium inlet to the cooling medium flow path is passed through said cooling medium flow path and is then allowed to flow out of the cooling medium outlet. According to the present invention, a bulged portion (,) protruding on the cooling medium flow path side is formed in the cooling medium flow portion by denting at least any one of these two flat plates from the outside, and a plurality of elliptical or oval cylindrical portions whose major diameter is oriented in the flow direction of the cooling medium are provided between these two flat plates by butting the top portion of this bulged portion to the opposite flat plate. Additionally, the number of the cylindrical portions is gradually decreased as the cooling medium flows downstream in the flow direction of the cooling medium.

A process is disclosed for the production of high purity mullites. The process involves reacting a mixture of aluminum alkoxide and silicon alkoxide with an atomic ratio (weight) of Al/Si in the range of 2-7 in an aromatic hydrocarbon solvent at a temperature of 200.degree.-350.degree. C. and calcining the resulting reaction product at a temperature above 900.degree. C. The mullite product obtained finds wide application as a high temperature service structural material such as for automotive engines and turbines as well as a support for combustion catalyst.

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Nishikasugai-gun, Japan

Masashi Inoue