KR20030080004A - Heat exchanger - Google Patents

Abstract

FIELD OF THE INVENTION The present invention relates to heat exchangers for use in motor vehicles or heat exchangers for industrial use, for example as evaporators, condensers, oil coolers, intercoolers, heater cores and the like. The present invention provides a heat exchanger providing each pair of plates formed on one side thereof with a peripheral ridge, a central ridge and a channel split U-shaped ridge formed by forging or cutting. Each pair of plates is fitted and engaged with each other, with the channel recesses facing each other to form a flat tube and a plurality of U-shaped split fluid passages of the U-shaped fluid channel inside the tube. Each adjacent pair of flat tubes is joined by header members interposed between the top ends of the tubes, each pair providing front and rear headers in communication with the front and rear fluid passage tubes and the top ends of the flat tubes. It includes a connection therebetween.

Flat tubes have a reduced front to back width, reduced wall thickness (thinner layers) and increased heat exchange efficiency to provide a heat exchanger that achieves higher heat exchange efficiency and improved heat exchange performance.

Description

Heat exchanger {HEAT EXCHANGER}

In general, aluminum heat exchangers are generally widely used as heat exchangers, especially evaporators for vehicle air conditioners, in view of light weight and workability.

At present, evaporators for vehicle air conditioners are mainly those of stacked type (in the form of layers). In making this type of evaporator, the heat exchange fins to the air and the tube parts for evaporating the coolant are joined together by brazing so that such evaporators are for example an extension of the fin tubes used conventionally in terms of performance and productivity. Superior to form heat exchanger These evaporators are especially well above the fin tube expansion form, as the louver fins with high heat transfer efficiency can be used as air fins for this type of evaporator to ensure increased heat exchange and low resistance to air flow.

Thus, lighter and smaller heat exchangers are made available to meet market demands for smaller size and reduced weight. In particular, in recent years many evaporators have been provided with filters on the front side in view of the problems associated with vehicle compartments, and the thickness needs to be reduced so that the heat exchanger provides space for installation of the filters.

As shown in Fig. 25, conventional heat exchangers for use as evaporators are provided for the front and rear coolant channels, each of which defines a recess 66 divided by a split ridge 64 extending generally vertically. A rectangular aluminum plate 62 having one formed on its surface and a recessed portion (not shown) that is continuous with the upper and lower portions of the recessed portion 66, respectively, and having a greater depth than this portion 66. Include a header with Each pair of adjacent plates 62 engages the opposed split ridges 64, 64 of the plates 62, 62 with respect to each other and their opposite peripheral edges 63, 63 with respect to each other and thereby The flat coolant channel 68 and each channel 68 are fitted together in an overlapping layer with its recessed surface opposing each other to form a flat tube portion 61 having successive upper and lower header portions. A plurality of such flat tube portions 61 are aligned in parallel with the pins inserted therebetween to provide heat exchange for the air. Each of the plates 62 is prepared from an aluminum sheet by press molding.

Conventional heat exchangers for use as evaporators have the following problems in fulfilling the commercial demand for thickness reduction.

(1) The plate 62 for forming the flat tube portion 61 is made from an aluminum sheet by drawing by use of a press, so that the divided ridge 64 and the peripheral edge 63 have an increased width. Thus, the joining portion between the two plates 62, 62, i.e., the joining portion of the opposing split ridges of the plates 62, 62 and the opposing peripheral edges 63, 63, which are unnecessary parts that do not pass the coolant. The joint has a relatively large area and, as a result, reduces the cross-sectional area of the coolant channel when the evaporator has a certain volume that provides increased resistance to the flow of coolant and impairs performance.

In order to meet this problem, the volume occupied by the air side fins in a given volume is also reduced, so it must be useful to give an increased height for the coolant channel and thereby ensure a sufficient cross-sectional area of the channel. Therefore, while the reduced air passages cause an increase in resistance to the flow of air that cannot provide a proper proportion of the air flow, the fins have a smaller area for heat transfer and are impaired in performance.

(2) On the other hand, the joint between the peripheral edges 63, 63 of the two plates 62, 62 does not have direct contact with the fins on the air side, which exhibits low heat transfer efficiency, so that a heat exchanger comprising such an unnecessary portion The decrease in the thickness increases the relative ratio to areas of the unnecessary parts irrelevant to the passage of the coolant.

(3) The header forming recesses of the plate 62 are worked by drawing, giving a greater depth than the front and rear coolant channels forming the recesses 66, 66 on opposite sides of the split ridge 64. As a result, it is made smaller in wall thickness than the recess portion 66. Although a flat tube portion 61 with a large ratio is given as a tolerance for pressure resistance, the header portion is the weakest for pressure. For a conventional heat exchanger, the flat tube portion 61 and the header portion are made of an integral plate material by a press operation, which limits the further reduction of the header portion in the wall thickness and weight.

The invention is subject to the provisions of U.S. Department of Commerce 35.119 (e) (1), based on the application data of Provisional Patent Application No. 60 / 302,371, filed June 3, 2001, in accordance with U.S. Department of Commerce 35.111 (b). Claimed priority and filed under US Department of Commerce, Article 35, 111 (a).

The present invention relates to heat exchangers for use in vehicles or for industrial use, for example evaporators, condensers, oil coolers, heat exchangers for use as heating cores.

1 is a perspective view of a heat exchanger according to a first embodiment of the present invention.

2 is an enlarged front view of the plate of the heat exchanger of FIG.

3 is an enlarged partial perspective view of the plate;

4 is an enlarged exploded perspective view of the heat exchanger of FIG.

5 is an enlarged cross-sectional view of a plate tube of a heat exchanger.

6 is a partially cutaway enlarged partial perspective view illustrating the heat exchanger.

FIG. 7 is an enlarged fragmentary sectional view showing a modification of the divided ridges of the plate of the heat exchanger of FIG.

8 is an enlarged front view showing a modified plate of the heat exchanger.

9 is an enlarged partial perspective view showing another modified plate of the heat exchanger.

10 is an enlarged cross-sectional view of a flat tube for a heat exchanger in which the plate of FIG. 9 is used.

11 is an enlarged exploded perspective view of a heat exchanger according to a second embodiment of the present invention.

12 is an enlarged fragmentary front view of the heat exchanger plate of FIG. 11 shown with a header.

13 is a perspective view of a heat exchanger according to a third embodiment of the present invention.

14 is an enlarged front view of the heat exchanger plate shown in FIG.

15 is an enlarged partial perspective view of a heat exchanger plate.

16 is an enlarged exploded perspective view of the upper end of the heat exchanger;

17 is an enlarged exploded perspective view of the lower end of the heat exchanger;

FIG. 18 is an enlarged front view of a plate for use in the heat exchanger of FIG. 1 to illustrate a second modification of the split ridge.

Figure 19 is an enlarged cross sectional view of a flat tube for a heat exchanger in which the plate of Figure 18 is used.

FIG. 20 is an enlarged front view of a plate for use in the heat exchanger of FIG. 1 to illustrate a third modification of the split ridge, which is coupled with one of the paired plates.

Figure 21 is an enlarged front view of another plate in pairs.

FIG. 22 is an enlarged front view of a plate for use in the heat exchanger of FIG. 1 to illustrate a fourth modification of the split ridge.

Figure 23 is an enlarged cross sectional view of a flat tube for a heat exchanger in which the plate of Figure 22 is used.

Figure 24 is an enlarged cross sectional view of the flat tube of the heat exchanger of the present invention, in which one of the connected pairs of plates is replaced with a flat plate as a variant.

Figure 25 is an enlarged cross sectional view of a flat tube of an example of a conventional heat exchanger.

The object of the present invention is to overcome the above technical problems of the prior art, and is made of a plate having ridges and recesses formed on one surface thereof by a forging or cutting operation instead of using a plate formed by a press operation, the header being reduced Formed from a member away from the plate to create a flat tube with front and back thickness, reduced wall thickness (reduced thickness layer) and increased heat transfer area, thereby achieving higher heat transfer efficiency and significantly improved heat exchange performance. It is to provide an applied heat exchanger.

Firstly, the present invention is located on the one side of the plate at the center of the periphery ridge provided on one side of the plate along the periphery of the plate and downward from the top of the plate to a position where a return channel can be formed. A plurality of plates each having a central ridge extending therein, the ridges being formed by forging or cutting, the respective pairs of each plate being formed inwardly of the peripheral ridge and on opposite sides of the central ridge. A U-shaped channel recess having a front and rear channel recess formed therein and a return channel recess positioned below the center ridge, the channel recess forming one of two fluid entry through holes at one end thereof. And form the remaining through holes at the other end, each of the several pairs of plates having a flat surface on the other side thereof, the pairs of plates each facing The U-channel recesses of the plates are held together with each other to engage the cartridges end-to-end with each other and the opposing center ridges end-to-end with each other to form a flat tube with a U-shaped fluid channel therein. A plurality of flat tubes arranged in parallel with a header member interposed between the upper ends of each pair of adjacent flat tubes to provide front and rear headers in communication with the ends of the pair of adjacent flat tubes, and The header member provides a heat exchanger having a pair of front and rear fluid passage tube portions in communication with the individual entry and exit holes of the pair of plates of adjacent flat tubes and a connection between the tube portions.

Secondly, the present invention has a U shape as a whole and is provided on the one side of the plate and divided into two branches at the center of the width of the plate and the edge ridge provided on one side of the plate along the opposite side edge and the lower edge. A pair of plates each having a central ridge having an upper end, the central ridge extending downward from an upper end to a position at which a return channel can be formed, the ridges being formed by forging or cutting, Each plate comprises a U-shaped channel recess formed inwardly of the U-shaped edge ridge and having a return channel recess positioned below the center ridge and front and rear channelless details formed on opposite sides of the center ridge, Each plate of the pairs has a flat surface on the other side, the pairs of plates end to end opposite opposite U-shaped edge ridges. Opposing center ridges, which are coupled to each other and comprising a bifurcated upper end, end to end with each other, thereby forming a U-shaped channel recess to form a U-shaped fluid channel therein with the bifurcated open tops Are joined together in opposition to each other, the pair of front and rear header members are each in the form of a pipe with a rectangular cross section, which couples a flat tube to the head member and communicates with a two-pronged open top end of the flat tube. Each header member has slits formed in the lower wall and arranged at predetermined intervals to provide a front and rear header, and the plurality of flat tubes insert a bifurcated open top into separate slits of the front and rear header members. By providing a heat exchanger characterized in that arranged in parallel.

In the heat exchanger having the first and second features described, a plurality of channel split U-ridges are formed in the U-channel recess of each plate by forging or cutting, and the plurality of U-shaped split flow paths are each flat. It is formed in the U-shaped dividing flow path inside the tube. The present invention provides various types of channel division ridges.

In a first aspect, a plurality of channel divided U-shaped ridges are formed in the U-shaped channel recesses of each plate by forging or cutting, and each of the pairs of plates is provided in the U-shaped fluid channel inside a flat tube. It is fitted with opposing recesses and respective opposing pairs of channel-dividing U-shaped ridges which are end-to-end coupled to each other to form a mold-dividing flow path.

The channel division ridge of the second form is as follows. Each plate of the pair has a height that is twice the depth of the channel recess in the channel recess and extends from the lower end of the straight portion and the straight portion positioned in the front or rear straight channel recess portion of the channel recess, Forming a front and rear channel split ridge having a four minute arc positioned within the return portion, the channel split ridge being formed by forging or cutting and the pairs of plates each being secured to each other with the channel recesses facing each other; When positioned differently, the pairs of plates are respectively fixed to one another with the channel recesses facing each other so that the upper ends of the front and rear channel splitting ridges provide channel recesses and engage the bottom wall flat surface of the plate opposite thereto. Thereby forming a U-shaped divided flow path in the U-shaped fluid channel inside the flat tube.

The channel division ridge of the third form is as follows. Each plate of the pairs is formed by forging or cutting so that each of the pairs in the channel recess are positioned differently when the recesses are held together in opposing states and have a height that is twice the depth of the channel recess. Forming a split ridge, each of said pairs of plates engaging a top surface of a channel split ridge on each plate of said pair to a flat surface of a bottom wall of a channel recess of another plate opposite said respective plate and thereby flat It is secured together to form a U-shaped divided flow path in the U-shaped fluid channel inside the tube.

The channel division ridge of the fourth aspect is as follows. Each plate of the pairs is formed by forging or cutting and forms a channel split ridge in the rear half of the channel recess with a height that is twice the depth of the channel recess and the channel recess of each plate is formed by the bottom wall. Having a front half in the shape of a provided flat surface, each of said pairs of plates joins the top ends of the channel division ridges to the bottom wall flat surface of the channel recess of the plate opposite the division ridges with the recesses facing each other; This is fixed together to form a U-shaped segmented flow path in the U-shaped fluid channel inside the flat tube.

With a heat exchanger having the first aspect of the invention, one of each pair of plates can be replaced with a plate.

More specifically, the heat exchanger in this case comprises ridge plates, each having a peripheral ridge portion provided on one side of the plate along its periphery and a central ridge portion provided on the one side of the plate at the center of its width, wherein Extending downward from the upper end of the plate to a position where a return channel can be formed, the ridge being formed by forging or cutting, each ridge plate having a U-shaped channel recess formed inwardly of the peripheral ridge and a central ridge A front and rear channel recess formed on opposite sides of the return channel recess and a return channel recess positioned below the central ridge, the channel recess having one of the two fluid entry through holes formed at one end thereof; With different through-holes formed at the ends, each ridge plate having a flat surface on its other side and fitted against each plate Each said plate has the same contour and same size as the ridge plate and two fluid entry and exit holes corresponding to the through hole, the peripheral ridge portion of the ridge plate has a top end coupled to the peripheral edge portion of the plate, and the ridge The central ridge portion of the plate has its top end coupled to the plane of the corresponding central portion of the plate, thereby forming a planar tube having a U-shaped fluid channel therein, the header interposed between the upper ends of each pair of adjacent planar tubes. The member and the plurality of planar tubes are arranged in parallel to provide front and rear headers in communication with the upper ends of the pair of adjacent planar tubes, wherein the header member is in communication with each entry through hole of the plate of the pair of adjacent planar tubes. And a pair of front and rear fluid path tubes and a connection between the tubes.

With a heat exchanger having a second aspect of the invention, one of each pair of plates can be replaced with a plate.

More specifically, the heat exchanger in this case comprises a ridge plate, each of which is U-shaped in its entirety and one side of the plate at the center of its width and the edge ridge portion provided on one side of the plate along its opposite side edges and bottom edges. Having a top ridge with a central ridge portion provided thereon, the central ridge portion extending downward from the top portion to a position where a return channel can be formed, the ridge portion being formed by forging or cutting, each ridge plate being U-shaped A front and rear channel recess formed on the opposite side of the center ridge portion having a U-shaped channel recess formed inwardly of the edge ridge portion and a return channel recess portion located below the center ridge portion, each ridge The plate has a plane on its other side and faces each plate, each said plate being the same as the ridge plate. It has one contour and the same size, the peripheral ridge portion of the ridge plate has a top end coupled to the peripheral edge of the plate, and the central ridge portion of the ridge plate comprising a branched top portion is coupled to the plane of the corresponding center of the plate. Having an end portion, thereby forming a planar tube having a branched open top and a U-shaped fluid channel therein, the pair of front and rear header members each having a pipe shape having a rectangular cross section, each header member being Having slits formed in the lower wall and arranged at predetermined intervals, the plurality of planar tubes are arranged in parallel by inserting the branched open upper ends into respective slits of the front and rear header members to couple the planar tubes to the header members; Provided are front and rear headers in communication with the branched open top of the planar tube.

In a heat exchanger having such a plate, a plurality of U-shaped channel split ridges are formed by forging or cutting in a U-shaped channel recess of each ridge plate, and each ridge plate and each plate are coupled to the plane of the corresponding center of the plate. It is fitted face to face with the U-shaped channel split ridge portion of the ridge plate to form a plurality of U-shaped divided fluid paths in the U-shaped fluid channel inside the planar tube.

Third, the present invention provides that each plate has a periphery ridge portion provided on one side of the plate along its periphery and a plate extending vertically with a central ridge portion provided on one side of the plate at the center of its width. A heat exchanger comprising a pair of plates, wherein the ridge portions are formed by forging or cutting, each plate of the pair being formed inwardly and inwardly of the peripheral ridge portion on opposite sides of the central ridge portion. Each recess of the pair has a planar surface on its other side, and each pair of said plates has a through hole formed in its respective upper and lower ends. They are fitted with their channel recesses opposed to each other to join the opposing peripheral ridges end to end with each other and the opposing center ridges end together. Flat tubes having front and rear fluid channels therein such that they are coupled to the bag end so that a plurality of planar tubes are arranged in parallel with the upper and lower header members interposed between the upper ends of each pair of adjacent planar tubes and between the lower ends thereof. Providing upper and lower headers in communication with the upper and lower ends of each pair of adjacent planar tubes, each header member communicating with a corresponding through hole of the pair of plates of the adjacent planar tubes. A fluid path tube and a connection between the tube.

Fourth, the present invention has a branched upper and branched lower end with side edge ridges provided on one side of the plate along their respective opposite side edges and a center ridge provided on one side of the plate at the center of its width. And a pair of plates having a plate having a plate, wherein the ridge portion is formed by forging or cutting, wherein each plate of the pair has side edge ridge portions on opposite sides of the central ridge portion. Each plate of the pair has a planar surface on its other side, the pair of each plate being fitted with their channel recess portions opposite to each other and opposed Joining the side edge ridges to each other end-to-end and opposing central ridges comprising branched upper and lower ends to end-to-end with each other Forming a planar tube having branched open top and bottom ends and front and rear fluid channels at its upper part, wherein the upper pair of front and rear header members and the lower pair of front and rear header members are each in the form of a pipe having a rectangular cross section; Each header member has slits formed in its upper and lower walls and arranged at predetermined intervals, the plurality of planar tubes joining the planar tubes to the header member and communicating with the branched top and bottom portions of each planar tube. It is arranged in parallel by inserting the branched top and bottom portions into each slit of the header member to provide an upper pair of front and rear headers and a lower pair of front and rear headers.

In a heat exchanger having the third or fourth features described, a plurality of channel split ridges are formed by forging or cutting in the front and rear channel recesses of each plate, and a plurality of divided fluid paths are formed in each planar tube. It is formed in the interior front and rear fluid channels. The present invention provides several modes of channel division ridges.

As a first mode, a plurality of channel division ridges are formed by forging or cutting in the front and rear channel recesses of each plate, and each pair of plates is fitted together with their recess portions opposed to each other so as to divide the channel divisions. Each opposing pair of branches joins end to end with each other and forms a divided fluid path within the front and rear fluid channels therein.

The second mode of the channel division ridge portion is as follows. Each plate is formed in each front and rear channel recess, and the front and rear channel division ridges have a height twice the depth of the recess portion, and when the pair of each plate is fitted with their opposing recess portions, The front and rear channel split ridges are formed by forging or cutting and alternately positioned, and the pair of respective plates are fitted to face each other so that the front and rear channel split ridges are bottom wall planar surfaces of the recesses of the plate opposite thereto. And form a divided fluid path in the front and rear fluid channels inside the planar tube.

The third mode of the channel division ridge portion is as follows. Each plate of the pair is formed in its respective front and rear channel recess portions and the channel division ridge portion has a height twice the depth of the recess portion, and the front and rear channel division ridge portions of each pair of plates face each other. Channel division ridges are formed by forging or cutting so that they are alternately positioned when they are laid, and each pair of plates is fitted with their recessed portions opposite each other so that the top ends of the front and rear channel division ridges of each plate of the pair are Is coupled to the bottom wall planar surface of the recess portion of the other plate of the pair opposite to each other to form a divided fluid path in the front and back fluid channels inside the planar tube.

The fourth mode of the channel division ridge portion is as follows. Each plate of the pair is formed in its respective front and rear channel recesses and the plurality of channel split ridges have a height twice the depth of the recess, the channel split ridges are formed by forging or cutting, and the bottom wall Other channel recesses having a planar surface do not have channel segmented ridges, and each said pair of plates is fitted with their recessed portions opposing each other so that the top end of the channel segmented ridge portions is flat with the recessed portion of the plate facing the other. It is coupled to the surface to form a divided fluid path in the front and back fluid channels in the planar tube.

In a heat exchanger having a third aspect of the invention, one of each pair of plates can be replaced with a plate.

More specifically, the heat exchangers in this case each comprise a peripheral ridge portion provided on one side of the plate along its periphery and a ridge plate extending vertically with a central ridge portion provided on one side of the plate at the center of its width. And the ridge portion is formed by forging or cutting, and each ridge plate has front and rear channel recess portions formed inwardly of the peripheral ridge portion on opposite sides of the central ridge portion, and each of the front and rear channel recess portions With through holes formed in its respective upper and lower ends, each ridge plate has a planar surface on its other side and is fitted facing each plate, and the ridge plate and fluid entry and exit holes correspond to the through holes. Each said plate has the same contour and the same size as the ridge plate, and the peripheral ridge portion of the ridge plate A top end coupled to the peripheral edge portion, the central ridge portion of the ridge plate having a top end coupled to the planar surface of the corresponding central portion of the plate, such that an upper portion interposed between the upper ends of each pair of adjacent planar tubes and between the lower ends thereof And a planar tube having a front and rear fluid channel therein so that a plurality of planar tubes are arranged in parallel with the lower header member to provide upper and lower headers in communication with the upper and lower ends of the pair of adjacent planar tubes, Each header member includes a pair of front and rear fluid path tubes and a connection therebetween in communication with corresponding through holes of the pair of plates of adjacent planar tubes.

In the heat exchanger, a connection of one of the upper and lower header members interposed between the upper and lower ends of each pair of adjacent planar tubes may have a path interconnecting the fluid path conduits of the header member.

In the heat exchanger with the fourth aspect of the invention, one of each pair of plates can be replaced with a flat plate.

In particular, the heat exchanger comprises a ridge plate, each having a side edge ridge provided on one side of the plate along opposite side edges and a center ridge provided on one side of the plate at the center of the width, the ridge plate having a bifurcated top and bottom portion; The ridges are formed by forging or cutting, each of the ridge plates having front and rear channel recesses formed inwardly of the side edge ridges on opposite sides of the central ridge, each ridge plate having a flat surface on the other side. Each of the flat plates has the same contour and size as the ridge plate, and the side edge ridges of the ridge plates have an upper end connected to the side edges of the flat plate, The central ridge comprises two forked upper and lower ends with upper ends connected to the flat surface of the corresponding central portion of the flat plate, whereby the flat tube is Has a forked open top and bottom and has a front and rear fluid channel formed therein, the upper and rear head member pairs at the top and the front and rear head member pairs at the bottom are each in the form of a pipe having a rectangular cross-section, Each has a slit formed in the upper wall or the lower wall and arranged in a predetermined space, wherein the plurality of flat tubes connect the flat tube to the head member and the upper pair of the front and rear heads and the lower pair of the front and rear heads are respectively It is arranged in parallel by inserting the bifurcation top and bottom portions into respective slits in the head member so as to be in communication with the bifurcation top and bottom portions of the flat tube.

In heat exchangers in which flat plates are used, each of the ridge plates has channel split ridges formed in the respective front and rear channel recesses by forging and cutting, and each ridge plate has an upper end portion of the flat plate in the flat plate. It is fitted to each flat plate face to face to form a separate fluid passageway in the front and rear fluid channels in the flat tube in connection with the flat surface of the corresponding portion.

In a heat exchanger having first and third features, a head member interposed between the ends of each pair of adjacent flat tubes is connected at its opposite end face to a flat surface on the other side of the opposite plate of the pair of flat tubes. Has a fluid passage tube portion. Preferably, a tack for temporarily holding the head member is provided on each of the edges forming the entry and exit hole in the end of each plate.

In the heat exchanger, a plurality of cutouts are formed in the channel splitting ridges of each plate such that adjacent separate fluid passages in the flat tube communicate with each other through cutout.

In any of the heat exchangers of the invention described above, fins are provided between each pair of adjacent flat tubes comprised in parallel flat tubes, the fins being flat on the other side of the plate of the pair of flat tubes. It has opposite side edges connected to it.

For use with any heat exchanger of the invention described above, the plate is a plate having recesses and ridges formed on one side by forging or cutting in place of the conventional plate formed by a press operation, and the head member is used to Members separated from the plate to provide. This feature provides a flat tube with reduced front-to-back width, reduced wall thickness (reduced thickness layer), and increased heat transfer area, benefiting higher heat transfer efficiency and significantly improved heat exchange performance. To provide.

Embodiments of the present invention are described below with reference to the drawings.

The terms "front", "rear", "left", "right", "top", and "bottom" as used herein are based on FIG. "Front" refers to the left side of Figure 2, "Rear" refers to the right side thereof, "Left" refers to the front side of the plane of the drawing, "Right" refers to the rear side of the plane, and "Top" refers to the upper part of the drawing. The side, "lower" refers to the lower side.

The figure shows a heat exchanger for use as an evaporator for a motor vehicle air conditioner.

1 shows a first embodiment of the present invention. The heat exchanger 1 for use as an evaporator is made of aluminum (including aluminum alloy).

A generally rectangular plate 2 made of an aluminum plate is provided along the periphery of the peripheral ridge 3 provided on one side of the plate and on the same side of the plate 2 at the center of the width and from the upper end of the plate to the refrigerant return channel. It has a central ridge 4 extending downward to the position where it is formed. U-shaped refrigerant channel recesses 6, formed in the plate 2 inwardly of the peripheral ridge 3, are located in front and rear straight refrigerant channel recesses 6a, which are located on opposite sides of the central ridge 4; 6b) and a refrigerant return channel recess 6c located below the central ridge.

According to the first embodiment, the plate 2 is provided with a U-shaped notch 14 as viewed from the front, in the middle of the width of the upper end of the plate. The central ridge 4 is connected at its upper end to the peripheral ridge 3 at the bottom of the notch 14.

The channel recess 6 has one of the refrigerant inlet and through holes 10 and 10 at one end and the other through hole 10 at the other end. The plate 2 has a plurality of channel drop U-shaped ridges 5 formed in the channel recesses 6 and extending approximately over the entire length.

The notches 14 in the middle of the width of the upper end of the plate 2 position the through holes 10, 10, as they are spaced apart from each other by the width of the notches 14. This prevents unnecessary heat exchange between the inlet of the refrigerant having a low temperature and the outlet of the refrigerant having a high temperature, and prevents the refrigerant flowing into the inlet header, which will be described later, from flowing through the short passage to the outlet header.

The corner portion of the return channel recess portion 6c of the channel recess 6 has a short circular ridge 9 to obtain improved heat exchange efficiency at the corner portion.

Each plate 2 is formed by forging or cutting, for example. The plates 2 are provided in pairs, each pair of plates 2 having a center ridge 4, 4 which opposes the opposite peripheral ridges 3, 3 of the plates 2, 2 from end to end with each other. ) Opposite to each other to end-to-end of each of the opposing pairs of channel division ridges 5, 5 to each other end to end to form a flat tube 12 having a U-shaped refrigerant channel 8 therein. It is fitted together with the U-shaped channel recesses 6 and 6, and together with a plurality of U-shaped separate refrigerant passages 7 formed in the refrigerant channel 8 in the flat tube 12.

Clad material is used for each plate 2 having a solder sheet attached to one surface, preferably to each of the inner and outer surfaces. These elements can then be easily connected.

The evaporator 1 of the present invention has headers 23, 23 interconnecting flat tubes 12, 12 providing a refrigerant circuit and formed in the following manner.

The plurality of flat tubes 12 have upper ends of each pair of adjacent flat tubes 12, 12 to provide front and rear headers 23, 23 in communication with the upper ends of the pair of adjacent flat tubes 12. It is arranged in parallel with the spectacle-shaped header member 20 interposed therebetween. The header member 20 is provided with a pair of front and rear refrigerant passage tube portions 21 and 21 communicating with respective entry and exit holes 10 and 10 of the plate 2, and a connection portion 22 between the tube portions. Include. Opposite end faces of the front and rear tube portions 21, 21 of the header member 20 are provided with flat surfaces provided by the other sides of each opposing plate 2, 2 of the paired flat tube 12. Connected.

Under the headers 23, 23, corrugated louver pins 24 which perform heat exchange with air are provided between adjacent flat tubes 12, 12. The pins 24 are connected to the flat surfaces of the plates 2 and 2 at their left and rear sides.

The corrugated louver pins 24 have louvers with bends for improved heat transfer.

The lower part of the U-shaped notch 14 formed in the middle of the width of the upper end of each plate 2 needs to be positioned below the connecting portion 22 of the spectacle-shaped head member 20 for drainage of condensate collected in the notch. have.

Tack 13, 13 for temporary holding of the header member 20 is provided in the middle of the lower edge defining the respective entry and exit holes 10, 10 of the upper end of the plate 2. The header member 20 is prevented from moving during soldering by these tacks 13, 13.

1 to 4, a pair of side plates 25 and 25 are arranged on the left and right sides of the evaporator 1, respectively. The left plate 25 is provided with an inlet pipe connection block 27 connected to the upper portion thereof.

The side plate 25 has a pair of front and rear through holes 26 and 26 formed at the upper end, and the pair of front and rear through holes 26 and 26 are a pair of front and rear holes formed in the block 27. It communicates with the through-holes 28 and 28, respectively. The holes 26, 26 of the side plate 25 communicate with the tube portions 21, 21 of the header member 20, respectively.

Incidentally, the side plate 25 need not be provided if the block 27 is directly attached to the plate 2 at the left or right outer end of the evaporator 1. Alternatively, the block 17 may be provided in the middle of the height of the side plate 25. In addition, the block 17 can be provided at the center of the length of the evaporator 1, or the inlet pipe connecting block provided at the left and right ends of the evaporator respectively for positioning the inlet and outlet separately at the left and right ends. And an outlet pipe connection block.

The evaporator parts described are assembled and then joined together by brazing to produce the necessary part of the evaporator 1.

The assembly is brazed in vacuo or furnace using a fluorine containing flux.

It is preferable to use relatively high strength materials for the side plate 25 and the header member 20 in view of the pressure resistance. Particular preference is given to using aluminum alloy containing magnesium in addition thereto.

In the case where a fluorine-containing flux is used, it is preferable to use an aluminum alloy material having a magnesium content of 0.4% or less, since adhesion and strength are improved.

The surfaces of the corrugated fin 24 and the plate 2 are substantially flat, such that the fin 24 is approximately 100% between the corrugated fin 24 and the interior of the circuit of the flat tube 12 to achieve very efficient heat exchange. It can be coupled to the flat tube 12.

The header member 20 providing the headers 23, 23 has a generally spectacled section with two refrigerant channels, one of which has the function of collecting or dispersing the introduction of the refrigerant, and the other It functions to collect or disperse the discharge of the refrigerant.

When the heat exchanger of the present invention is used as the evaporator 1, the refrigerant is introduced into the flat tube 12 in the form of a mixture of liquid and gas. At this time, the liquid refrigerant has a higher density than gas and is more easily affected by inertial forces. Liquid refrigerants have the property of advancing more linearly than gases. Because of this, the liquid refrigerant tends to collect a large amount at the header end away from the inlet header. Uneven flow of the liquid refrigerant breaks the latent heat balance of vaporization in various parts, which is a major cause of impairment of performance. This can be effectively ruled out by projecting the flat tube 12 into the header 23 to reduce the properties of the liquid refrigerant advancing in a straight line and to function as a baffle.

According to the present invention, for example, the baffle is set by setting the height b1 of the through-hole 10 at the inlet side of the flat tube 12 smaller than the inner diameter b2 of the refrigerant passage tube portion 21 of the header member 20. It is configured to easily provide a structure. The effect of baffles can be produced by reducing the cross-sectional area of the front and rear tube portions 21 of the header member 20 at one or a plurality of locations, thereby generating a flow that changes the cross-sectional area.

This procedure reduces the properties of the liquid refrigerant advancing straight through the headers 23, 23, allowing the refrigerant to flow into the flat tube 12 in equally divided amounts.

The protruding ratio of the flat tube 12 into the header 23 in the evaporator 1 of the present invention is defined below.

(b2-b1) / b2

Here, b1 is the height of the through hole 10 at the inlet side of the flat tube 12, b2 is the inner diameter of the tube portion 21 of the header member 20, the projection ratio of 10 to 60% so as to be appropriate In range If the rate of protrusion is less than 10%, the effect of the baffle plate does not occur, allowing for the occurrence of uneven flow easily, while if the rate of protrusion is greater than 60%, the header 23 provides increased resistance to flow. This entails undesirably impaired performance.

As shown in Fig. 5, the U-shaped split refrigerant passage 7 formed in the refrigerant channel 8 inside each of the flat tubes 12 is placed on the pair of plates 2, 2 of the tube 12 inward. It is possible to make the cross section generally hexagonal by tapering the peripheral ridges 3, 3 inwardly, tapering the central ridges 4, 4 inwardly, and tapering the channel division ridges 5, 5 inwardly. This is because it is effective for spraying the liquid refrigerant in a thin layer over the inner surface of the refrigerant channel 8 of the flat tube 12 for heat transfer.

Of the U-shaped divided refrigerant passages 7 formed in the channel 8 inside the flat tube 12, the passage 7a between the peripheral ridge 3 and the channel-divided U-shaped ridge 5 has a hexagon having a large width. It has a cross section, and the passage 7b between the ridges 5 and 5 has a hexagonal cross section having a small width.

On the other hand, when the U-shaped divided refrigerant passage 7 formed in the inner refrigerant channel 8 of the flat tube 12 has a rectangular cross section as shown in FIG. 7, for example, the liquid refrigerant flowing at a lower speed than the gas If the circuit width is reduced to provide increased surface area for the coolant because is pressed towards the passage end, the liquid coolant must be collected within the wall corners of the flat tube 12. Due to the liquid refrigerant required for the evaporation pressurized towards the end portion, the liquid refrigerant is formed on the inner walls of the peripheral ridges 3 and 3, the central ridges 4 and 4 and the channel division ridges 5 and 5 in the flat tube 12. It will not attach and there will be no efficient heat exchange, so the heat exchanger will not show the desired performance.

When the divided refrigerant passage 7 is generally hexagonal in cross section as shown in Fig. 5, the liquid refrigerant is most easily collected in the recesses in the middle of the passage 7, so that a pair for effective heat transfer Are attached to the tapered surfaces of the peripheral ridges 3 and 3 on the plates 2 and 2, the papered surfaces of the central ridges 4 and 4 and the tapered surfaces of the split ridges 5 and 5, Can effectively function as an internal shock to demonstrate improved heat transfer performance. As a result, the area of the effective portion is increased in the heat transfer portion inside the refrigerant passage 7 to cool the air to ensure stability.

However, since the overall width of the channel for passing the low temperature refrigerant is the same as the width of the contact portion of the corrugated fin 24 for the heat exchanger of the present invention to achieve higher heat exchange efficiency than the conventional heat exchanger, the evaporator of the present invention. (1) may be formed as shown in one of Figs.

According to the first embodiment of the invention described, for example, the plate 12 is 10 to 40 mm wide and 0.25 to 1.0 mm thick.

For example, the peripheral ridge 3 on the plate 2 has a thickness of 0.25 to 1.0 mm and a width of 0.5 to 2.0 mm. For example, the central ridge 4 on the plate 2 is 0.25-1.0 mm thick and 0.5-2.0 mm wide. For example, the channel divided U-shaped ridge 5 on the plate 2 has a thickness of 0.25 to 1.0 mm and a width of 0.25 to 1.0 mm.

In the evaporator 1 described above, the refrigerant introduced into the front header 23 through one of the through holes 28 in the pipe connection block 27, ie through the inlet hole 28, is U-shaped in each flat tube 12. Flows from one end of the refrigerant channel 8 into the split refrigerant passage 7, through the U-shaped passage 7 to the other end of the channel 8, and also in the rear leather 23 and the block 27. It passes through the other through hole 28, ie the outlet hole 28, and flows out of the evaporator.

On the other hand, air flows between adjacent flat tubes 12 and between tube 12 and each end to achieve efficient heat exchange with refrigerant through walls of louver fins 24, end plates 25 and flat tubes 12. It flows through the evaporator 1 from front to back through a space formed between the plates 25 and each having a corrugated louver fin 24 therein.

The evaporator 1 according to the first embodiment is manufactured from plates which are used in place of conventional plates formed by press work and having ridges and recesses formed on one side, such as by forging or cutting. The front and rear headers are formed by header members separated from the plates. These properties reduce the front and rear widths for the flat tube 12, reduce the thickness (thin layer), and provide a large area of heat exchange, so that the evaporator can achieve high heat transfer efficiency and greatly improve heat exchange performance. Make it visible.

In order to ensure an improved heat transfer refrigerant in the flat tube 12, a plurality of cutouts 15 are channel-shaped U-shaped on each plate 2 at predetermined intervals, for example as shown in FIG. It is preferable to be formed in the ridge 5, and the cutouts 15 in the adjacent ridges 5 are arranged in a staggered arrangement so that the divided adjacent refrigerant passages 7 and 7 inside the tube 12 are cutouts 15. To communicate with each other.

Alternatively, the flat tube 12 may be arranged in a staggered arrangement to generate turbulent flow of refrigerant to improve heat transfer, as shown, for example, in FIGS. 9 and 10 16. It can have

11 and 12 show a second embodiment of the present invention. This embodiment is different from the first embodiment in that a pair of front and rear header members 41 and 42, each in the form of a pipe having a rectangular cross section, is used.

More specifically, the evaporator 1 is made from a generally rectangular plate 2 which is an aluminum plate. Each of these plates 2 is provided on one side of the plate along the opposite edge and its lower edge and is provided on the same side of the plate 2 at the center of the width and the edge ridge 33 which is entirely U-shaped. It has a branched top 34a and a central ridge 34 extending downward from the top 34a to a position where a coolant return channel can be formed. The plate 2 is formed inside the U-edge ridge 33 and is positioned below the front and rear straight refrigerant channel recesses 36a and 36a and the center ridge formed on the other side of the center ridge 34. It has a U-shaped refrigerant channel recess 36 that includes a return channel recess 36c. The plate 2 has a plurality of channel segmented U-shaped ridges 35 formed inside the channel recess 36 and extending over almost the entire length thereof.

The corner of the return channel recess 36c of the channel recess 36 has an arcuate ridge 39 to achieve improved heat exchange efficiency at the corner.

According to the second embodiment, the plate 2 is provided in the widthwise center portion of its upper end with the notch 37 that is U-shaped when viewed from the front. The central ridge 34 has a branched top 34a.

For example, each plate 2 is formed by forging or cutting. The plates 2 are provided in pairs, each pair of plates 2 having opposite U-shaped edge ridges 33, 33 of the plates 2, 2 from end to end with each other, the top end branching from end to end with each other. Join each of the opposed center ridges 34, 34 comprising 34a and opposite pairs of channel diverging ridges 5, 5 from end to end with each other and thereby branched open top 32a. Fitted with their U-shaped channel recesses 36 and 36 opposed to each other to form a flat tube 32 having, a plurality of U-shaped branched refrigerant passages are formed inside the flat tube 12.

On the other hand, the pair of front and rear header members 41 and 42 are rectangular in cross section, respectively, and are in the form of pipes having a lower wall 43, a front wall 45, a rear wall 46 and an upper wall 47. Header members 41 and 42 have slits 44 and 44 formed in their respective lower walls 43 and 43 and arranged at predetermined intervals. The flat tubes 32 are arranged in parallel lateral directions, and the front and rear header members insert their branched open upper ends 32a into respective slits 44 and 44 of the parallel arranged header members 41 and 42. Thereby engaging the flat tube with the header member so as to be in communication with the branched open top end 32a of the flat tube 32.

At this time, the rear wall 46 and the front wall 45 of each of the front and rear header members 41 and 42 in parallel are U at the upper end of the opposing plates 2 and 2 of the respective flat tubes 32. The notches 37 and 37 are joined together and fitted together.

Below the header, corrugated pins 24 are provided between adjacent flat tubes 32 and 32. The left and right sides of the pin 24 are coupled to the flat surface provided by the other sides of the plates 2, 2.

Since the evaporator 1 of the second embodiment is manufactured in the same way as the first embodiment in that the assembly of parts is soldered in a furnace or in vacuum using fluorine containing fluxes, like parts are designated with like numbers throughout the associated drawings. do.

Although not shown, the pair of front and rear header members 41, 42, each in the form of a rectangular pipe, can be replaced by a single aluminum molding having two refrigerant channels, which are generally rectangular in cross section, and described second embodiment. It can be partitioned by the central wall for use in the evaporator 1 according to the example. The moldings have slits 44 and 44 formed in the lower wall portions of each of the moldings defining the coolant channels and arranged at predetermined intervals. The front and rear headers insert the bisected open tops 32a, 32a of the tubes into the respective slits 44, 44 to join the tubes to the lower wall, thereby providing a bisected open top of the parallel flat tube 32 ( 32a, 32a).

13 to 17 show a third embodiment different from the first embodiment in that the header 57 and the header 58 are provided at the top and the bottom of the evaporator 1, respectively.

Referring to the figure, a generally rectangular plate 2 made of an aluminum plate has a peripheral ridge 3 provided along its periphery on one side of the plate 2 and its width on the same side of the plate 2. It has a center and has a vertical ridge 4 extending vertically. The front and rear refrigerant channel recesses 6a and 6b and the through holes 10 and 10 formed in the upper and lower ends of the recesses 6a and 6b located on opposite sides of the central ridge 4 are peripheral ridges. It is formed in the plate 2 inside (3). The plate 2 has a straight channel split ridge 5 formed in the channel recesses 6a and 6b and extending over approximately the entire length of the portions 6a and 6b.

The plate 2 is formed, for example, by forging or cutting. These plates 2 are provided in pairs and each pair of plates 2 couples the opposing peripheral ridges 3, 3 of the plates 2, 2 from end to end and mutually opposes the opposite center ridges 4, 4. By mutually coupling end-to-end with each pair of opposed channel split ridges 5, 5 mutually end-to-end, parallel partitioned refrigerant passages 7 are formed therein and U-shaped refrigerant channels 8 are formed. It is fitted with recessed portions 6a and 6b opposed to each other to form a flat tube 12 having (see FIG. 7 of the first embodiment).

The required number of flat tubes 12 are arranged side by side. The spectacled upper and lower header members 51, 52 each comprising a pair of front and rear coolant passage tube portions 53, 53, 54, 54 and connections 55, 56 therebetween are adjacent flat tubes. Interposed between the upper end and the lower end of each pair, the tube parts 53 and 54 communicate with the corresponding through hole 10 of the opposing plate 2, respectively.

As shown in detail in FIG. 14, among the pairs of front and rear through holes 10 and 10 formed at the upper and lower ends of the plate 2, the pair of front and rear through holes 10a and 10a at the upper end of the plate 2. Are circular shapes each extending horizontally. In connection with this hole, the front and rear tube portions 53, 53 of the upper header member 51 provided between the upper ends of the flat tubes 12, 12 have a similar horizontally extending circular cross section. On the other hand, the pair of front and rear through-holes 10b and 10b of the lower end of the plate 2 are inclined forwardly downward or rearward upwardly, respectively, and have a circular shape. In relation to this hole, the front and rear tube portions 54, 54 of the lower header member 52 provided between the lower ends of the flat tubes 12, 12 are inclined forwardly downward or rearward upward and similarly stretched horizontally. Has a cross section.

16 and 17, the tube portions 53, 53, 54, 54 of the upper and lower header members 51, 52 are flat on the other side of the plate of the tubes 12, 12 with opposite end faces flat. Joined to the surface, the surface opposite the end face, so that the upper and lower headers 57, 58 are formed in communication with the upper and lower ends of the flat tubes 12, 12, respectively.

Between the upper and lower headers 57, 58, a corrugated louver pin 24 for heat exchange with air is interposed between each pair of adjacent flat tubes 12, 12. The pin 24 is joined to the other side at its opposite side edge, ie to the flat surface of the plates 2, 2 of the flat tubes 12, 12.

Of the upper and lower header members 51, 52 between adjacent flat tubes 12, 12 in the evaporator 1 of the third embodiment, the lower header member 52 is the front and rear tube portions of the header member 52 ( 54, 54 on opposite sides of the intermediate connecting portion 56 for interconnecting.

In the evaporator 1 of the third embodiment described, the refrigerant is the front tube part of each upper header member 51 which provides the front upper header 57 from the inlet through hole 18 of the inlet connection block 27. (53) introduced inward, from which the refrigerant flows into the front upper end of the refrigerant channel (8) of each flat tube (12), and then flows down the straight split refrigerant passage (7) in front of the channel (8). At the lower end, from there the refrigerant flows temporarily into the front tube portion of the lower header member 52 providing the front lower header 58 and then the interconnect passages 59, 59 of the lower header member 52. Flows into the rear tube portion 54 which passes through and provides the rear lower header 58. Subsequently, the refrigerant flows into the rear lower end of the refrigerant channel 8 of the flat tube 12 and reaches the rear upper end of the channel 8, and the rear tube of the upper header member 51 providing the rear upper header 57. It passes through the portion 53 and flows out of the outlet through hole 28 of the block 27.

In the evaporator 1 of the third embodiment, the front and rear tube portions 54, 54 of the lower header member 52 between the lower ends of the flat tubes 12, 12 condense on the outer surface of the evaporator 1. It has a circular cross-section that is tilted upwards downwards or backwards upwards to allow for smooth drainage of the water produced.

Although not shown, the evaporator of the third embodiment also has a plurality of channel split ridges 5 on each plate such that adjacent split refrigerant passages 7, 7 in the flat tube 12 communicate with each other through the cutout 15. The notch 15 may be formed and modified as in the modified example of FIG.

Of the upper and lower header members 51, 52 provided between the adjacent flat tubes 12 of the upper and lower ends of the evaporator 1 of the third embodiment, the upper header member 51 faces in the opposite direction to the case where the refrigerant is shown. Contrary to the case shown for flow to the side, passages 59, 59 formed on opposite sides of the intermediate connection 55 for interconnecting the front and rear tube portions 53, 53 of the header member 51. )

The evaporator 1 of the third embodiment has the same structure as the first embodiment described elsewhere, so that similar parts are designated by like numbers throughout the associated drawings.

18 and 19 show channel division ridges 5 on the plate 2 used in the evaporator according to the first embodiment of the invention, ie the first embodiment in shape and arrangement. The channel division ridges 5a, 5b formed in the refrigerant channel recess 6 of each plate 2, which are different from the channel division U-shaped ridges 5 shown in FIG. Another difference is that the ridges 5a, 5b on each plate 2 are joined to the flat lower wall of the plate 2 opposite it and provide an upper end for providing the refrigerant channel recess 6.

18 and 19, each plate 2 of the evaporator 1 has a peripheral ridge 3 along its periphery on one side thereof and a return channel downward from the top of the plate at the center of the plate's width. It has a central ridge 4 extending to a position where it can be formed. More specifically, each pair of plates 2a, 2b comprises a plurality of front and rear channel dividing ridges 5a, 5b having a height twice the depth of channel recess 6 for refrigerant channel recesses 6. Have on. These ridges 5a, 5b form a parallel U-shaped split refrigerant passage 7 which is independent of the U-shaped refrigerant channel 8 of the flat tube 12 when the pair of plates 2a, 2b are fitted together. Is provided.

Referring to Fig. 18, these ridges 5a and 5b are recessed portions 5a1 and 5b1 located in front and rear straight channel recess portions 6a and 6b of the refrigerant channel recess 6, respectively. 1/4 circular arc portions 5a2 and 5b2 extending from straight portions located at the return portion 6c of (6). The ridges 5a and 5b correspond to exactly half of the U-shape in shape.

When the pair of plates 2a, 2b are fitted with the opposing recesses 6, 6, the straight portions 5a1, 5b1 and the quarter circular arc portions 5a2, 5b2) are alternately arranged at predetermined intervals.

When the pair of plates 2a and 2b are fitted, the opposing center ridges 4 and 4 are mutually supported and joined while the peripheral ridges 3 and 3 are similarly engaged with each other, and each of the plates 2a and 2b The straight portions 5a1, 5b1 and the quarter circular arcs 5a2, 5b2 of the channel division ridges 5a, 5b on the upper surface thereof are flat surfaces of the lower wall of the other plates 2a, 2b opposite them. By joining and providing the channel recess 6, the flat tube 12 is formed with a U-shaped refrigerant channel 8 formed therein. In the channel 8 of the flat tube 12, the front channel division ridge 5a of the plate 2a of the pair of plates 2a, 2b is U-shaped to the rear ridge 5b on the other plate 2b. Combined, providing a divided parallel U-shaped refrigerant passage 7. The divided passage 7 in the return part is in the form of a semicircular arc.

The return channel recess 6c of the U-shaped channel recess 6 is provided with short circular arc ridges 9a, 9b at the corners on the front and rear sides to ensure improved heat exchange performance of that portion. These circular arc ridges 9a, 9b are arranged such that they are alternately positioned at predetermined intervals when the pair of plates 2a, 2b are fitted with mutually opposing recesses 6, 6.

The above modified example is the same as that of the first embodiment. For example, the plate 2 is manufactured by forging or cutting. Thus, throughout the relevant drawings, like parts have been designated with like numbers.

In the evaporator 1 described above, the front and rear channel dividing ridges 5a, 5b on the pair of plates 2a, 2b connect the straight portions 5a1, 5b1 and the quarter circular arc portions 5a2, 5b2. And exactly half of the U-shape. These ridges 5a, 5b are such that when the pair of plates 2a, 2b are fitted with mutually opposing recesses 6, 6, the ridges 5a, 5b are alternately positioned at predetermined intervals. Are arranged. Thus, the number of split ridges 5a, 5b produced by forging and cutting is reduced, while the ridges 5a, 5b on plates 2a, 2b can be spaced apart at elongated intervals and exactly half of the U-shape. Since it can be formed to have, there is an advantage that the plates (2a, 2b) is easy to manufacture.

20 and 21 show a third modification of the channel dividing ridge 5 on the plate 2 used in the evaporator 1 according to the first embodiment of the present invention. In this modification, the two kinds of plates 2a and 2b have channel division U-shaped ridges 5a and 5b which differ in arrangement in the refrigerant channel recesses 6 and 6, and the ridges 5a on the plates 2a and 2b. 5b differs from the first embodiment in that it has an upper end coupled to the flat surface of the lower wall of the recess 6 of the opposing plates 2b, 2a.

Referring to the figures, the channel-dividing U-shaped ridges 5a, 5b having a height twice the depth of the recesses 6, 6 are such that these plates 2a, 2b are face-to-face. in the U-shaped recesses 6 and 6 of the pair of plates 2a and 2b so as to be alternately positioned at predetermined intervals when fitted together in the face).

In the plates 2a, 2b fitted together in the face-to-face, the opposing center ridges 4, 4 as well as the opposing plate peripheral ridges 3, 3 are joined in contact with each other and the channel division U on the plates 2a, 2b The shaped ridges 5a, 5b have their upper ends coupled to the bottom wall flat surfaces of the recesses 6, 6 of the plates 2b, 2a opposite the ridges, thereby being driven by the ridges 5a, 5b. A flat tube 12 is formed having a divided parallel U-shaped refrigerant passage 7 and provided in the U-shaped refrigerant channel 8.

At the front and rear corners of the refrigerant return channel recesses 6c of the U-shaped refrigerant channel recesses 6 and 6, the arcuate ridges 9a and 9b are provided so that the recesses exhibit improved heat exchange performance. Is provided. These front and rear single arc ridges 9a, 9b are alternately positioned at predetermined intervals when the pair of plates 2a, 2b are fitted together into the face to face.

The modification is the same as in the first embodiment except that each plate 2 is produced by forging or cutting, for example. Therefore, the same parts are denoted by the same reference numerals throughout the related drawings.

In the evaporator 1 in which two kinds of plates 2a and 2b are used, the channel division U-shaped ridges 5a and 5b on the two plates 2a and 2b have these plates 2a and 2b face to face. The ridges 5a and 5b are arranged so as to be alternately positioned at predetermined intervals when fitted together. Thus, the number of divided ridges 5a, 5b produced by forging or cutting can be further reduced, while the ridges 5a, 5b on the plates 2a, 2b can be spaced at increased intervals, Therefore, the plate 2a, 2b has the advantage of easy manufacturing.

22 and 23 show a fourth variant of the channel dividing ridge 5 on the plate 2 for use in the evaporator 1 according to the first embodiment of the invention. In this variant, a plurality of channel division ridges 5 are provided only at the rear half of the refrigerant channel recess 6 of each plate 2 and at the front half of the recess 6 no ridges 5 are provided. The front half is made of flat surface, the ridge 5 is shaped to have exactly half of the U-shape, and the ridge 5 on each plate 2 is opposite to the other plate 6 Is different from the first embodiment in that it has an upper end coupled to the bottom wall flat surface of the recess 6.

Referring to the figures, each plate 2 of the evaporator 1 is provided along its periphery with a peripheral ridge 3 provided on one side of the plate, on the same side of the plate at the center of its width and on the upper side of the plate. It has a center ridge 4 extending downward from the end to a position where a return channel can be formed. A plurality of channel dividing ridges 5b having a height twice the depth of the recess 6 is provided in the rear half of the refrigerant channel recess 6 of each plate 2, The front half is not provided with ridges 5 at all and the front half is made of flat surfaces.

More specifically with reference to Fig. 22, the channel division ridge 5b provided in the rear half of the refrigerant channel recess 6 of each plate 2 is a straight portion formed in the rear straight channel recess 6b. 5b1 and a quarter arc-shaped portion 5b2 extending from the straight portion and provided in the return portion 6c of the recess 6, respectively, wherein the ridge 5b is shaped to have exactly half of a U-shape. do.

In a pair of plates 2a, 2b fitted together face to face, the opposing center ridges 4, 4 as well as the opposing plate peripheral ridges 3, 3 are joined in contact with each other and on the plates 2a, 2b. The channel split U-ridges 5, 5 have their upper ends coupled to the bottom wall flat surfaces of the refrigerant channel recesses 6, 6 of the plates 2b, 2a opposite the ridges, whereby U-shaped refrigerant A flat tube 12 with a channel 8 is formed. The front ridge 5a on one of the two plates 2a, 2b is produced in series with the rear ridge 5b on the other plate 2b, whereby the parallel U-shaped split refrigerant passage 7 ) Is formed in the U-shaped refrigerant channel 8 of the flat tube 12. The passage 7 has a semicircular return.

An arcuate ridge 9 is provided on the rear corner of the return channel recess 6c of the recess 6 so that the recess exhibits improved heat exchange performance.

The modification is the same as in the first embodiment except that each plate 2 is produced by forging or cutting, for example. Therefore, the same parts are denoted by the same reference numerals throughout the related drawings.

In the evaporator 1, the channel division ridges 5 on each plate 2 are straight portions 5b1 and quarter arcs 5b2 extending from the straight portions and shaped to have exactly half of the U-shape. And each of the front halves of the recesses 6 of each plate 2 has a flat surface which is free of the channel dividing ridges 5. Therefore, the ridge 5 formed on the plate 2 by forging or cutting can be reduced in half, and therefore, the manufacturing of the plates 2a and 2b is easy.

Figure 24 shows a pair of plates for use in the evaporator 1 of the first embodiment of the invention, in which one of the plates is replaced with a flat plate.

Referring to the drawings, the ridge forming plate 2 of the first embodiment, namely the plate 2b, has a peripheral edge ridge 3 provided on one side of the plate along its periphery and its width, as is apparent from FIG. A central ridge 4 which is provided on the same side of the plate at the center and extends downward from the upper end of the plate to a position where a coolant return channel can be formed. The U-shaped refrigerant channel recesses 6 formed in the plate on the inner side of the peripheral ridge 3 have front and rear straight refrigerant channel recesses 6a and 6b and center ridges located on opposite sides of the central ridge 4. And a refrigerant return channel recess 6c located at the bottom of the recess. The plate has a plurality of channel divided U-shaped ridges 5 formed inside the channel recess 6 and extending approximately over their entire length. The plate 2b has a notch 14 that is U-shaped when viewed from the front, in the widthwise middle portion of its upper end. The central ridge 14 is coupled at its lower end to the peripheral ridge 3 at the lower end of the notch 14. The channel recess 6 of the plate 2b has one of the refrigerant inlet and through holes 10 and 10 formed at one end thereof, and the other through hole 10 is formed at the other end thereof.

On the other hand, the flat plate 2a has not only U-shaped recesses but any channel division U-shaped ridges, but has the same outer shape as the flat surface and ridge plate 2b. The plate 2a is provided with a U-shaped notch as viewed from the front in the widthwise middle portion of the upper end thereof. The flat plate 2a also has a refrigerant inlet and through hole formed at its upper end at its front and rear sides (not shown).

These flat plates 2a and ridge forming plates 2b are provided in pairs with each pair of plates fitted together in a face-to-face. The peripheral ridge 3 on the ridge forming plate 2b has its upper end coupled to the flat surface of the peripheral edge portion of the flat plate 2a, and the upper end of the central ridge 4 has a flat portion at the center of the flat plate 2a. Coupled to a plane, the upper end of the ridge 5 is coupled to a corresponding flat surface portion of the flat plate 2a, whereby a plurality of divided refrigerant passages 7 are formed in the channel 8. A flat tube 12 having 8 is formed.

The evaporator 1 including the flat plate 2a described above is the same as in the first embodiment except that the ridge forming plate 2b is produced by forging or cutting. Therefore, the same parts are denoted by the same reference numerals throughout the associated drawings.

The evaporator 1 comprises a ridge forming plate 2b having a peripheral ridge 3, a central ridge 4 and a channel split ridge 5, and a flat plate 2a having the same contour as the plate 2b. do. This serves to provide the advantage that the manufacture of the evaporator 1 is easy by reducing the number of used ridge forming plates 2b prepared by forging or cutting, etc. by half.

The evaporator 1 is constructed as described below in the second embodiment of the invention shown in Figs. 11 and 12, in which the pair of front and rear header members 41, 42 used are in the form of pipes of rectangular cross section, respectively. It can be modified.

As in the modification shown in Figs. 18 and 19, the first modification is formed in the channel recess 6 of each plate 2 and extends from the straight portions 5a1 and 5b1 and the straight portions. It has a plurality of channel dividing ridges 5a, 5b, including / 4 arc portions 5a2, 5b2, having exactly half of a U-shape and having a height twice the depth of the recess 6. When the pair of plates 2a, 2b are fitted together face to face, a flat tube in which the ridges 5a, 5b form separate parallel U-shaped split refrigerant passages 7 in the U-shaped refrigerant channel 8 12 is formed. The ridges 5a, 5b of each plate 2 have an upper end coupled to the bottom wall flat surface of the recess 6 of the other plate 2 opposite to the ridge.

As in the modification shown in Figs. 20 and 21, two kinds of plates 2a and 2b can be used in the second modification described later. The plates 2a, 2b are provided with channel division U-shaped ridges 5a, 5b which have different arrangements in the refrigerant channel recesses 6, 6 and have a height twice the depth of the recesses 6, 6. Have In this case, the ridges 5a, 5b on each plate 2a, 2b have an upper end coupled to the bottom wall flat surface of the recess 6 of the other of the plates 2b, 2a opposite thereto. .

22 and 23, a plate 2 having a plurality of channel division ridges 5 formed only in the rear half of the refrigerant channel recess 6 can be used in the third modification. The front half of the recess 6 has no ridges and is formed into a flat surface. In this case, the ridge 5 on each plate 2 has an upper end coupled to the bottom wall flat surface of the recess 6 of the other plate 2 opposite it.

In the case of the flat tube shown in Fig. 24, the plate usable in the fourth modification together with the ridge forming plate 2b which is the plate 2 of the second embodiment of Fig. 12 is a flat plate having the same contour as the plate 2b. (2a). In this case, the peripheral edge ridge 3 on the ridge forming plate 2b has its upper end coupled to the flat surface of the peripheral edge of the flat plate 2a, and the upper end of the central ridge 4 has the flat plate 2a. Coupled to a flat surface of the central portion, and an upper end of the channel split ridge 5 is coupled to a corresponding flat surface portion of the flat plate 2a, whereby a plurality of U-shaped divided refrigerant passages 7 are connected to the refrigerant channel 8. There is provided a flat tube 12 formed therein.

Although not shown, the evaporator 1 of the third embodiment of the present invention, in which the upper and lower headers 57 and 58 are provided, has the spectacle-shaped upper and lower header members shown in Figs. Instead of 51 and 52, a pair of front and rear header members 41 and 42 may be included, respectively, in the form of rectangular pipes shown in Figs.

The evaporator thus modified is described in the fourth embodiment of the present invention. The evaporator 1 according to the fourth embodiment of the present invention will be described using reference numerals of FIGS. 11 and 12. Each of the plates 2 of the pair of plates has a straight side edge ridge provided on one side of the plate along its opposite side edge and an upper and lower end bifurcated and bifurcated on the same side of the plate at the center of its width. A central ridge 34 having 34a and 34a, the ridges being formed by forging or cutting, each plate 2 being formed inside of side edge ridges on both sides of the central ridge 34 Having front and rear straight channel recesses 36a, 36a, each plate 2 having a flat surface on its other side, and each of the pairs of plates having their front and rear channel recesses facing each other ( 36a, 36b end-to-end mating opposite straight side edge ridges 33, 33 to each other and opposite center ridges 34, 34 with bifurcated upper and lower ends 34a, 34a end to each other Open top and two branched inwards by mating ends Forming a flat tube 32 having a lower end and front and rear straight fluid channels 38, 38, wherein the upper and lower pairs of the front and rear header members 41, 42 are each in the form of a pipe having a rectangular cross section. Each of the header members 41 and 42 has slits 44 and 44 formed on the upper wall 47 or the lower wall 43 thereof and arranged at predetermined intervals, and the plurality of flat tubes 32 are flat. The bifurcated upper or lower end of the bifurcated upper and lower ends are coupled to the header member and provide upper and lower pairs of front and rear headers in communication with the bifurcated upper and lower ends of the flat tube 32, respectively. Parallel to each other by inserting into each slit 44, 44 of 41, 42.

At this time, the rear wall 46 and the front wall 45 of the individual juxtaposed front and rear header members 41 and 42 are respectively U-shaped notches 37 of the upper end of the opposing plates 2 and 2 of the flat tube 32. , 37) are joined together and fixed together.

The evaporator 1 of the third embodiment of the present invention in which the upper and lower headers 57 and 58 are provided by the spectacled upper and lower header members 51 and 52 and the front and rear headers in which the upper and lower headers are in the form of rectangular pipes. A variant of the evaporator 1 of the fourth embodiment of the present invention provided by the pair of members 41 and 42 is described below.

18 and 19, a plurality of front and rear channels having a height that is twice the depth of the recesses 6a and 6b in the individual front and rear refrigerant channel recesses 6a and 6b. The plates 2, 2a, 2b in which the divided ridges 5a, 5b are formed are available as the first modification. When the pairs of plates 2a and 2b are fixed to face each other, these ridges 5a and 5b provide for forming independent refrigerant passages 7 which are divided in parallel in the refrigerant channels 8 in the flat tube 12. do. In this case, the channel dividing ridges 5a, 5b of each plate 2a, 2b have their upper ends coupled to the bottom wall flat surface of the recesses 6a, 6b of the other plate 2a or 2b opposite thereto. do.

Two kinds of plates 2a and 2b, such as the embodiment shown in Figs. 20 and 21, are available as the second modification. These plates 2a, 2b are different in the arrangement of the straight channel splitting ridges 5a, 5b which are provided in the refrigerant channel recesses 6, 6 and have a height that is twice the depth of the recesses 6, 6. In this case, the straight channel dividing ridges 5a, 5b on each plate 2a, 2b cause their upper ends to be joined to the bottom wall flat surface of the recess of the other plate 2a or 2b opposite thereto.

As in the case of the embodiment shown in Figs. 22 and 23, a plate 2 having a plurality of channel division straight ridges 5 formed only in the rear half of the refrigerant channel recess 6 is available as the third modification. The front half of the recess 6 has no ridge at all and is a flat surface. In this case, the straight ridge 5 of the plate 2 causes the upper end to engage the flat surface of the bottom wall of the recess 6 of the other plate 2 opposite it.

As in the case of the flat tube shown in Fig. 24, a flat plate 2a having the same contour as the plate 2b in combination with the ridged plate 2b is available as the fourth embodiment. In this case, the ridges with the upper ends of the central ridges 4, 34 coupled to the flat surface of the center of the flat plate 2a and the channel dividing straight ridges 5 coupled to the corresponding flat surface portion of the flat plate 2a. The side edge ridges 3, 33 of the formed plate 2b allow the upper end to be coupled to the flat surface of the side edge portion of the flat plate 2a, thereby forming a plurality of divided refrigerants formed in the refrigerant channels 8, 38. Flat tubes 12, 32 are provided having passages 7 and front and rear straight refrigerant channels 8, 38 formed in the tubes.

Although the heat exchanger 1 of the present invention has been described with reference to an embodiment for use as an evaporator for an automobile air conditioner, the present invention is a heat exchanger for use in an industrial or automobile such as an evaporator, a condenser, an oil cooler, an intercooler, a heater core, and the like. It can also be applied to the flag.

When the heat exchanger 1 of the present invention is used, for example, as a heater heat exchanger for a heating system, efficient heat exchange is possible since the overall width of the channel for the fluid is the same as the contact width of the radiator fin 24. Moreover, the internal fluid can be passed in a counterflow relationship with air. This results in increased temperature efficiency which leads to higher heat exchanger efficiency and realizes miniaturized apparatus.

Claims (23)

A central ridge provided on one side of the plate along the periphery of the plate and a center ridge provided on the one side of the plate and extending downward from the top of the plate to a position where a return channel can be formed And several pairs of plates, wherein the ridges are formed by forging or cutting, the respective pairs of each plate being formed inwardly of the peripheral ridge and formed on opposite sides of the central ridge. A U-shaped channel recess having a return channel recess positioned below the center and the central ridge, the channel recess forming one of two fluid entry through holes at one end thereof and the remaining through holes at the other end thereof. Each plate of the several pairs has a flat surface on the other side thereof, the pairs of plates each having opposite peripheral ridges Adjacent flat tubes are secured together with the U-shaped channel recesses of the plates opposed to each other so as to join the bag-to-end and the opposite center ridges to each other end-to-end to form a flat tube with U-shaped fluid channels therein. A plurality of flat tubes are arranged in parallel with the header members interposed between the upper ends of each pair of the beams to provide front and rear headers in communication with the ends of the pair of adjacent flat tubes, the header members being adjacent And a pair of front and rear fluid passage tube portions communicating with the individual entry and exit holes of the pair of plates of the flat tube and a connection portion between the tube portions. A central ridge having an overall U shape and an edge ridge provided on one side of the plate along opposite side edges and bottom edges and a central ridge provided on the one side of the plate and divided in two at the center of the width of the plate. A pair of plates, the central ridge extending downward from an upper end to a position at which a return channel can be formed, the ridges being formed by forging or cutting, each plate of the pair having a U-shaped edge A U-shaped channel recess formed inwardly of the ridge and having a return channel recess positioned below the center ridge and forward and rear channel recesses formed on opposite sides of the central ridge, each plate of the pairs comprising: Having a flat surface on the other side, said pairs of plates join opposite U-shaped edge ridges from end to end and Opposing center ridges comprising an upper portion divided by end to end are joined to each other, whereby U-shaped channel recesses are opposed to each other to form an open upper portion divided into two and a U-shaped fluid channel therein. Coupled together, the pair of front and rear header members are each in the form of a pipe having a rectangular cross section, and the front and rear headers are coupled to the head member and in communication with the bifurcated open top of the flat tube. Each header member has slits formed in the bottom wall and arranged at predetermined intervals to provide, and the plurality of flat tubes are arranged in parallel by inserting the bifurcated open top into separate slits of the front and rear header members. Heat exchanger, characterized in that. A plurality of channel division U-shaped ridges are formed in a U-channel recess of each plate by forging or cutting, wherein the pairs of plates are each with recesses facing each other. Heat exchanger, characterized in that the opposing pairs of channel split U-ridges are fixed together, end to end, respectively joined together to form a plurality of U-shaped divided fluid passages within the flat tube. 3. A straight line according to claim 1 or 2, wherein each plate of the pairs has a straight portion within the channel recess that is twice the depth of the channel recess and positioned within the front or rear straight channel recess portion of the channel recess. Forming front and rear channel split ridges extending from the lower end of the straight portion and having a four minute arc positioned within the return of the channel recess, the channel split ridges being formed by forging or cutting and the pairs of plates are each The sets are positioned differently when they are fixed to each other in opposition to each other, and said pairs of plates are fixed to each other with channel recesses opposing each other to provide channel recesses to the top ends of the front and rear channel division ridges, respectively. To the flat surface of the bottom wall of the opposing plate, whereby it is U-shaped in a U-shaped fluid channel inside the flat tube. Heat exchanger, characterized in that to form a fluid passage to. 3. A channel according to claim 1 or 2, wherein each plate of the pairs is formed by forging or cutting so that each of the pairs in the channel recess are positioned differently when the recesses are held together in opposition. Forming a channel split ridge having a height that is twice the depth of the set, each of said pairs of plates on each plate of said pair on a flat surface of the bottom wall of the channel recess of another plate opposite said each plate; Heat exchanger characterized in that it joins the top of the channel split ridge and is thereby fixed together to form a U-shaped divided fluid passage within the U-shaped fluid channel inside the flat tube. The channel divide ridge according to claim 1 or 2, wherein each plate of the pairs is formed by forging or cutting and has a channel division ridge in the rear half of the channel recess, each having a height that is twice the depth of the channel recess. The channel recess of the plate has a front half in the shape of a flat surface provided by the bottom wall, each of said pairs of plates having the tops of the channel division ridges facing the division ridges with the recesses facing each other. A heat exchanger coupled to the bottom wall flat surface of the recess and thereby fixed together to form a U-shaped divided fluid passage within the U-shaped fluid channel inside the flat tube. A central ridge provided on the one side of the plate and extending downward from the upper end of the plate to a position where a return channel can be formed at the center of the width of the plate and the peripheral ridge provided on one side of the plate along the periphery of the plate. Wherein the ridge is formed by forging or cutting, each of the ridged plates being formed inwardly of the peripheral ridge and positioned below the front and rear channel recesses and the center ridge formed on opposite sides of the central ridge. A U-shaped channel recess having a channel recess, the channel recess having one of two fluid entry and exit holes formed at one end and the other through hole formed at the other end thereof, respectively. Has a flat surface on the other side and is fixed to each of the flat plates in a face-to-face manner, each of which is like a ridged plate. Having a contour and dimension and two fluid entry and exit holes corresponding to the through hole, the peripheral ridge of the ridged plate has an upper end coupled to the peripheral edge of the flat plate, and the central ridge of the ridged plate is a flat plate A flat tube having an upper end coupled to the flat surface of the corresponding central portion of the flat tube, the flat tube having a U-shaped fluid channel therein to provide a front and rear header such that a plurality of flat tubes communicate with the upper ends of the pairs of adjacent flat tubes. In order to be arranged in parallel between the upper ends of each pair of adjacent flat tubes with a header member interposed therebetween, the header members being in communication with the respective entry and exit holes of the plates of the pair of adjacent flat tubes. And a connection between the front and rear fluid passage tube portions and the tube portions. An edge ridge as a whole and having a U-shaped edge ridge provided on one side of the plate along the opposite edge, a lower ridge, and a central ridge provided on one side of the plate at the widthwise center and divided into two upper portions; The center ridge extends downwards from the top to where the return channel is formed, The ridges comprise a ridge plate formed by forging or cutting, Each ridge plate has a U-shaped channel recess formed inwardly of the U-shaped edge ridge and includes a front and rear channel recess formed on the opposite side of the center ridge and a return channel recess located below the center ridge, Each ridge plate has a flat surface on the other side and the flat plates are fitted face to face, respectively. Each flat plate has the same size and same shape as the ridge plate, The peripheral ridge of the ridge plate has a top end that engages with the peripheral ridge of the flat plate, The central ridge of the ridge plate comprises a bifurcated top with a top end that engages the flat surface of the corresponding central portion of the flat plate, so that the flat tube has a bifurcated open top, with a U-shaped fluid channel inside. Is formed, The pair of front and rear header members are each in the shape of a pipe with a rectangular cross section, Each header member is arranged at predetermined intervals with slits formed in the lower wall, The plurality of flat tubes are flattened by inserting the bifurcated open top into the slits of the front and rear header members, respectively, such that the flat tube is coupled to the header member and the front and rear headers communicate with the bifurcated open top of the flat tube. Heat exchanger, characterized in that arranged. The method according to claim 7 or 8, wherein the plurality of channel divided U-shaped ridges are formed in the U-shaped channel recesses of each ridge plate by forging or cutting, and each ridge plate and each flat plate are inside the flat tube. And a face-to-face fit with the channel-split U-shaped ridge of the ridge plate coupled to the flat surface of the corresponding central portion of the flat plate to form a plurality of U-shaped divided flow paths within the U-shaped fluid channel of heat transmitter. A pair of plates, each plate of the pairs having a peripheral ridge provided on one side of the plate along the periphery and a central ridge provided on the one side of the plate and extending vertically at the center of the width, The ridges are formed by forging or cutting, Each plate of the pairs has front and rear channel recesses formed inside of the peripheral ridge on opposite sides of the central ridge, Each of the front and rear channel recesses has through holes formed in their respective upper and lower ends, Each pair of adjacent flat tubes is joined to a plurality of flat tubes, with the peripheral ridges opposed to each other end-to-end and the central ridges opposed to each other end-to-end combined to form a flat tube with front and rear fluid channels therein. Each plate of the pair is opposed to each other such that the upper and lower headers of the are arranged in parallel with the upper and lower header members interposed between the upper and lower ends, respectively, so that the upper and lower ends of the adjacent pair of flat tubes are in communication. Fit with channel recess, Wherein each header member comprises a pair of front and rear fluid passage tube portions and a connection between the tube portions in communication with corresponding through holes of the pair of plates of an adjacent flat tube. A pair of plates, each plate of the pairs being divided in two with a side edge ridge provided on one side of the plate along each opposite edge and a center ridge provided on the one side of the plate at a width center; An upper part and a lower part divided into two parts, Ridges are formed by forging or cutting, Each plate of the pairs has front and rear channel recesses formed inwardly of the side edge ridges on opposite sides of the central ridge, Each plate of the pair has a flat surface on the other side, Each pair of plates is fitted with channel recesses opposed to each other to engage opposite edge ridges end to end with each other and the opposing center ridges have open top and bottom portions divided into two ends to end. A bifurcated top and bottom portion forming a flat tube and a front and rear fluid channel therein, The upper pair of front and rear header members and the lower pair of front and rear header members are each pipe-shaped with a rectangular cross section, Each header member has slits formed in the upper wall or the lower wall and arranged at predetermined intervals, The plurality of flat tubes have a bifurcated upper end that couples the flat tube to the header members and the upper pair of front and rear headers and the lower pair of front and rear headers communicate with the bifurcated top and bottom portions of the flat tube, respectively. Or arranged in parallel by inserting a lower end into each slit in the header members. 12. The method according to claim 10 or 11, wherein a plurality of channel split ridges are formed in the front and rear channel recesses of each plate by forging or cutting, each pair of plates being each of opposing pairs of channel split ridges. Are fitted to each other with recessed portions opposed to each other so as to couple end to end with each other and form a divided fluid passageway in the inner front and rear fluid channels. 12. The front and rear channel split ridges of claim 10 or 11, wherein each plate is formed with respective front and rear channel recesses and the front and rear channel split ridges have a height that is twice the depth of the recessed portions. Formed by forging or cutting and positioned alternately when each of the pairs of plates are fitted together in opposing recesses, each of the pairs of plates having the top end of the front and rear channel dividing ridges facing each other And a face to face fit to the bottom wall flat surface of the recess to form a divided fluid passageway of the front and rear fluid channels of the flat tube. 12. The device according to claim 10 or 11, wherein each plate of the pair is formed of front and rear recesses, respectively, and the channel division ridges have a height that is twice the depth of the recesses, and the channel division ridges are fitted face to face. By forging or cutting so that the front and rear channel dividing ridges of the respective pairs of plates are alternately positioned as they are fitted, each pair of plates having an upper end of the front and rear channel dividing ridges of each plate of the pair Heat exchanger, which is fitted together into opposing recesses to engage the opposing pair of bottom wall flat surfaces to form divided fluid passages of the front and rear fluid channels inside the flat tube. 12. The method of claim 10 or 11, wherein each plate is formed as one of the front and rear channel recesses and the plurality of channel division ridges have a height that is twice the depth of the recess portion, and the channel division ridges are for forging or cutting. And the other channel recessed portion has a bottom wall flat surface without channel segmented ridges, each of the pairs of plates flattening by joining the top end of the channel segmented ridge to the bottom wall flat surface of the recessed portion of the opposing plate. A heat exchanger fitted with recesses opposed to each other to form divided fluid passageways in the front and rear fluid channels inside the tube. A ridge plate each having a peripheral ridge provided on one side of the plate along the periphery and a central ridge provided on the one side of the plate and extending vertically at the center of the width, The ridges are formed by forging or cutting, The respective ridge plates have front and rear channel recesses formed inwardly of the peripheral ridge on opposite sides of the central ridge, Each of the front and rear channel recesses has through holes formed in the upper and lower ends, respectively. Each ridge plate has a flat surface on the other side and is fitted face to face on each of the flat plates, Each of the flat plates has a same size and same shape as the ridge plate and fluid entry through holes corresponding to the through hole, the peripheral ridge of the ridge plate has a top end coupled to the peripheral edge of the flat plate, The central ridge has a top portion that engages a flat surface corresponding to the center of the flat plate, such that each of the pair of flat tubes is adjacent to a plurality of flat tubes such that the top header and the bottom header communicate with the top and bottom portions of the pair of adjacent tubes. A flat tube having front and rear fluid channels therein formed so as to be arranged in parallel with the upper and lower header members interposed between the upper ends and the lower ends, respectively; Each of the header members comprises a pair of front and rear fluid passage tube portions and a connection between the tube portions in communication with corresponding through holes in the plate of the pair of adjacent flat tubes. 17. The heat exchanger of claim 16, wherein a connection of one of the upper and lower header members between the upper and lower ends of each pair of adjacent flat tubes has a passage that interconnects the fluid passage tube portion of the header member. A ridge plate each having a lateral edge ridge provided on one side along each of the opposite side edges and a central ridge provided on said one side of the plate at the center of the width and having a bifurcated upper and lower ends; The ridge is formed by forging or cutting, Each of the ridge plates has front and rear channel recesses formed inwardly of the side edge ridges on opposite sides of the central ridge, Each ridge plate has a flat surface on the other side and the flat plates are fitted face to face, respectively. Each flat plate has the same size and same shape as the ridge plate, The peripheral ridge of the ridge plate has a top end that engages with the peripheral ridge of the flat plate, The center ridge of the ridge plate has a top and bottom divided into two branches and has a top end that engages a flat surface corresponding to the center of the flat plate so that the flat tube has an open top and bottom divided into two branches Fluid channels are formed, The upper pair of front and rear header members and the lower pair of front and rear header members are each pipe-shaped with a rectangular cross section, Each of the header members is disposed at predetermined intervals with slits formed on the upper wall or the lower wall, The plurality of flat tubes join the flat tube to the header member and the bifurcated upper end or the upper pair of front and rear headers and the lower pair of front and rear headers communicate with the bifurcated top and bottom portions of the flat tube respectively. And arranged in parallel by inserting the lower ends into the slits of the header members, respectively. 19. The ridge plate of claim 16 or 18, wherein each of the ridge plates has channel split ridges formed in the front and rear channel recesses, respectively, by forging or cutting, each ridge plate flat plate top end of the channel split ridge. A face-to-face fitting to the flat plate, respectively, to couple to the flat surface of the corresponding portion of the to form a divided fluid passageway of the front and rear fluid channels inside the flat tube. The method of claim 1, wherein the header member interposed between the ends of each pair of adjacent flat tubes has a pair of flat tubes at opposite end faces. And a fluid through tube portion coupled to the flat surface on the other side of the opposing plates. 17. The tag of any of claims 1, 7, 10 and 16, wherein the tack for temporarily retaining the header member provides a respective edge defining an entry and exit hole at the end of each plate. Heat exchanger characterized in that. 20. A method according to any one of claims 3 to 6, 9, 12 to 15 and 19, wherein the plurality of cutouts comprise adjacent split fluid passages within the flat tube through the cutouts. And a channel division ridge of each plate so as to communicate with each other. 19. The adjoining one of claims 1, 2, 7, 8, 10, 11, 16 and 18, each adjacent included in a parallel tube arranged in parallel. Wherein a fin is provided between the pair of flat tubes, the fin having opposing side edges coupled to the flat surface of the other side of the plates of the pair of flat tubes.