Zexel Gmbh

Zexel Valeo Climate Control Corporation

Soichi Kato

Shoji Akiyama

Takashi Sugita

Muneo Sakurada

Shin Kurihara

Takahumi Umehara

Sadao Haiya

Kazuo Ochiai

Akihiko Takano

Jun Akaike

Hitoshi Makabe

A heat exchanger comprising a heat exchange core () including a plurality of tubes () flowing a medium for heat exchange and a pair of tanks () to which ends of said tubes are connected, each tube formed by shaping a plate member () not clad with a row laminated brazing material and having a sacrifice layer () on an outer surface thereof and a plurality of recessed portions () formed on an outer surface of said sacrifice layer and filled with a brazing material (R).

Heat exchanger

A heat exchanger provided with tubesthrough which a medium flows and tanksto which the ends of the tubes are connected to perform heat exchange of the medium with heat conducted to the tubes, wherein the tanks each provided with an end platehaving holesfor connection of the ends of the tubes and a tank plateto which the end plate is fitted; and when it is assumed that a cross section of the tank in its longitudinal direction has a passage area X and a total wetted perimeter length Y for the medium, they have a relationship of X=a&#xb7;Y/4 &#x3c0; and 0.9&#x2266;a&#x3c;1.0.

A heat exchanger for performing heat exchange of a medium by heat conducted to tubes () and fins (), the heat exchanger is configured by assembling the tubes, the fins, tanks () and a connector () and heating them in a furnace to be brazed into one body, wherein the connector is made of aluminum or its alloy and has a seating face to be brazed to the outer surface of the tank, and when it is determined that the connector has a surface area of X [cm] and a volume of Y [cm], they have a relation of X&#x2267;1.5&#xb7;(36&#x3c0;Y), Y&#x2266;30.

A tube for a heat exchanger which has beads ( ) formed on a brazing sheet (B) for configuring a tube ( ) and tops of the beads brazed with opposed portions within a tube part ( ) and a method for manufacturing the tube. The tube part ( ) prior to brazing is determined to have a thickness (t&prime;) larger than a predetermined thickness (t) and compressed in a direction of its thickness when it is brazed, and the tube which has tops of the beads crushed against or lodged in opposed portions within the tube part. Also a method for manufacturing the tube which can braze the tops of the beads with the opposed portions within the tube more securely and firmly than before.

Tube for heat exchangers and method of manufacturing the same

A heat exchanger has a connector ( ) for connecting a receiver tank ( ) brazed to a header pipe ( ) and the receiver tank ( ) connected to the connector ( ) by male screw parts, wherein the connector ( ) is formed to have a brazing face ( ) against the header pipe ( ) narrower than a mating face ( ) against the receiver tank ( ). The connector ( ) has a plurality of holes ( ), ( ) into which a plurality of male screw parts are inserted or screwed, and the holes ( ), ( ) are formed symmetrically or substantially symmetrically on the brazing face ( ) against the header pipe ( ) with respect to a straight line connecting the center of an outflow path ( ) and that of an inflow path ( ) on the mating face ( ) against the receiver tank ( ). And, a groove ( ) which divides the brazing face ( ) is formed between the inflow path ( ) and the outflow path ( ) on the brazing face ( ) against the header pipe ( ).

A heat exchanger is comprising a core which is consisting of tubes provided with medium passages and fins fitted to the tubes, and tanks to which ends of the tubes are connected, wherein the tube ( ) is formed to have a flat cross-sectional shape by joining ends of one or two plates, the ends of the plates have a contact portion which is formed by bending at least one of the plate ends a plurality of times and overlaying the one end on the other end, and the contact portion is provided with a joint portion ( c) which is formed by placing a part ( e) of the contact portion on the top or bottom flat surface and mutually engaging the both ends of the plate.

Heat exchanger, method of manufacturing the heat exchanger, and method of manufacturing tube for heat exchange

A heat exchanger ( ) is formed by stacking tubes ( ) formed by rolling a flat tube material ( ) with a fin ( ) interposed between the adjacent tubes, joining tanks ( ), ( ) and the tubes, ( ) to appropriately communicate the tubes ( ) and the tanks ( ), ( ), wherein the tube ( ) is provided with a partition ( ) for dividing a passage ( ) of the tube ( ) into passages ( ),( ) and the partition ( ) has an extra section for absorbing a deformation produced when a partition part ( ) and the tube are formed.

Heat exchanger, tube for heat exchanger, and method of manufacturing the heat exchanger and the tube

A tube for a heat exchanger which is formed to have beads for dividing passages for a medium in the tube by roll forming, wherein base portions of the beads are formed to have a thickness (B) greater than a thickness of a plate material for the tube. The roll forming has a first step of sequentially bending the plate to have a depressed shape to form portions-to-be-bead which are to be intermediate forms of the beads, a second step of performing a width drawing of the portions-to-be-bead and a third step of compressing the portions-to-be-bead, after the second step, in a direction of the height of the beads, wherein a width (w&prime;) of the depressions of the portions-to-be-bead ( ) in the first step is larger than a width (w) of depressions of beads ( ) after forming, and a height (h&prime;) of portions-to-be-bead ( ) after the second step is determined to be higher than a height (h) of the beads ( ) after forming. Thus, the tube for a heat exchanger having a pressure resistance of the base portions of the beads improved and a method for producing the tube for a heat exchanger which can decrease an uneven thickness of the plate when the beads are formed are obtained.

Tube for heat exchangers and method of manufacturing same

A heat exchanger comprises a plurality of tubes layered with fins intervened between them, header pipes disposed on the end portions of the tubes, and side plates for holding the tube layer, wherein each of the side plates ( ) is connected to a side plate insertion hole ( ) formed on the header pipe ( ) or ( ) by inserting its end portion ( ) into the side plate insertion hole and forming a taper on the end portion ( ) of the side plate ( ) to decrease a thickness toward the leading end ( ). The end portions ( ) of the side plates ( ) are tapered toward the leading ends to decrease a width, contact portions ( ) are formed on the side plate to contact with the outer surface of the header pipes ( ), ( ), and the contact portions are brazed with the outer surface of the header pipe. Further, a stopper means is formed on the end portions of the side plates to prevent the end portions of the side plates from coming out of the side plate insertion holes ( ).

A receiver tank (,) formed into an airtight container having an inlet port (,) and an outlet port (,) for a refrigerant, wherein separates the refrigerant introduced in a gas-liquid mixture state is separated, and the separated liquid refrigerant is stored therein and discharged therefrom so to continuously supply it, and the airtight container is formed as a double tube of an inner tube (,) and an outer tube (,), which have their tops mutually communicated but their bottoms not; the inlet port is formed to communicate with the bottom portion of a passage formed between the two tubes; and the outlet port is formed at lower end portions of the inner and outer tubes to communicate with the interior of the inner tube. The structure of no communication between the outer tube and the inner tube was achieved by having a structure of fitting either of them with the other or by disposing a joint member. A structure for prevention of the inner tube from tilting is provided. And, airtightness is improved by forming a knurled portion on a contact portion of the members.

Receiver tank

A method of manufacturing flat tubes by forming a flat tube body from a single plate material which is continuously drawn from a drum by either folding it into two or placing two plate materials one upon the other, and cutting the flat tube body in a predetermined length. The method is characterized by the steps of placing the plate material with its inner surface facing downwardly at any selected stage before completion of folding the plate into two, or before completion of placing two plates one upon the other; fluxing the inner surface of the plate material with a liquid flux material, and drying the applied flux material.

Method of manufacturing flat tubes for heat exchanger

A flat tube 2 for a heat exchanger which is formed by bending a single plate or overlaying two plates, wherein long beads 11 in a plurality of rows are previously formed on the plate in the longitudinal direction of the plate, the plate has its surface, to which the respective long beads are opposed, formed flat, the tops of the respective long beads 11 and the flat surface are joined, a plurality of passages 12 for a medium are formed within the tube by long beads and the flat surface, sections at the tube ends to be inserted into the header tanks 3, 4 are pressed back to be flat to form tube insertion sections, and a wall relief, which is formed to protrude in the breadth direction of the tube when the tube insertion sections are formed, is used as a stopper 16 to restrict a tube insertion level.

Flat tubes for heat exchanger

When forming a circular tube-shaped header pipe by rolling a plate material, surfaces extending at a right angle to the internal and external surfaces of the plate material are formed at the two side edges extending in the lengthwise direction, and the plate material is rolled in such a manner that the two side edges face opposite each other while setting the two side edges in a non-contact state. In this process, the gap between the two side edges is set at or less than 0.3 mm. In order to manufacture this header pipe, a plate material that has been cut to a specific length is trimmed in the direction of its short side to achieve a specific dimension and also at a right angle to the front and rear surfaces of the plate material. After a piping insertion hole is formed, the entirety of the plate material is rolled so that its cross section achieves a U-shape. A plurality of tube insertion holes are formed in this state and then, with only an upper die and a lower die, the two side edges of the plate material are rolled in a circular tube shape so that they face opposite each other. Any level misalignment between the side edge portions that face opposite each other can be prevented, and defective brazing is eliminated.

Header pipe for heat exchanger and manufacturing apparatus and

Heat-exchanging conduit tubes for a laminated heat exchanger made of aluminum material containing aluminum alloy having a brazing material claded and formed by folding one plate or overlaying two plates and brazing to connect edge joints of the folded plate or the overlaid plates, wherein the folded plate or the overlaid plates have projections protruded from one or both faces of the opposed plates toward the other plate, the projections are joined in contact with a flat face of the other plate or the projections of the other plate, and the edge joints of the folded plate or the overlaid plates are joined, and the height of the edge joint of the each plate is smaller than those of the projections. Thus, the heat-exchanging conduit tubes can be securely brazed to provide flat tubes having a satisfactory pressure resistance, and a method for producing them can be attained.

Heat-exchanging conduit tubes for laminated heat exchanger and method

A heat exchanger that a tube member 2' has beads 21 protruded from the face of one plate toward the other plate, tube member 2' is held by block members 31, 31, a forming jig 40 is inserted between medium passages 24, 24 formed by the beads 21 to hold to press the beads 21 at an end 2a of the tube member 2' to mutually adhere the faces of the beads 21 on the outer face of the tube member 2', and recesses formed by the mutually contacted faces of the beads 21, 21 have a cross-sectional area of about 0.2 mm.sup.2 or below. And, a region where the recesses have a cross-sectional area of about 0.2 mm.sup.2 or below is within 10 mm outside header pipes 3, 4.

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Saitama, Japan

Soichi Kato