CN1714269A - Flat hollow body for passing fluid therethrough, heat exchanger comprising the hollow body and process for fabricating the heat exchanger - Google Patents

Abstract

A fluid passing flat hollow body 2 comprises an upper and a lower flat plate 15, 16 elongated laterally and spaced apart as positioned one above the other, and a channel forming body 17 interposed between and brazed to the two flat plates 15, 16. The channel forming body 17 comprises two straight side bars 18 extending laterally and arranged between the upper and lower flat plates 15, 16 respectively at front and rear opposite side edges thereof, an intermediate bar 19 extending laterally and disposed between and spaced apart from the two side bars 18, two heat transfer area increasing portions 21 each interconnecting the intermediate bar 19 and each of the side bars 18 integrally therewith and positioned at an intermediate portion of the height of the bars, and end bars 22 extending forwardly or rearwardly inward from right ends of the respective side bars 18 integrally therewith and having respective inner ends butting on and brazed to front and rear opposite side faces of a right end of the intermediate bar 19. The intermediate bar 19 has a left end portion cut out therefrom, the two heat transfer area increasing portions 21 have respective right end portions cut out therefrom, and each of the flat plates 15, 16 has holes 13, 14 formed in a right end portion thereof respectively on front and rear opposite sides of the intermediate bar 19. Each of the two flat plates 15, 16 is bent at a left end portion thereof toward the other flat plate, and the bent portions 15 a, 16 a are lapped over and brazed to each other.

Description

Flat hollow body through which fluid flows, heat exchanger comprising the hollow body, and method of manufacturing the heat exchanger

Cross References to Related Applications

This application is an application filed under 35 U.S.C. §111(a) and claims the filing date benefit of provisional application No. 60/480745, which was filed under 35 U.S.C. § 119(e)(1). §111(b) filed June 24, 2003.

technical field

The present invention relates to a flat hollow body through which a fluid flows, comprising the hollow body for use as a heat exchanger for industrial machines such as oil coolers, aftercoolers and radiators of industrial machines such as compressors, machine tools and hydraulic machines, and a A method for manufacturing the heat exchanger.

Herein, the upper and lower sides and the left-hand and right-hand sides of FIG. 1 will be referred to as "upper", "lower", "left" and "right", respectively. The term "front" refers to the downstream side in the flow direction of the low-temperature fluid between each pair of adjacent flat hollow bodies that exchanges heat with the high-temperature fluid passing through the hollow bodies, ie, FIG. 1 and FIGS. 10 to 12 In the direction indicated by the arrow X, the term "rear" refers to the opposite direction. The terms "upper", "lower", "left", "right", "front", and "rear" are defined for convenience; each pair of these terms "upper" and "lower", "left" and " "Right" as well as "front" and "back" can be replaced by the latter to indicate the opposite direction. In addition, the term "aluminum" to be used hereinafter includes aluminum alloys in addition to pure aluminum.

Background technique

Known heat exchangers for industrial machines such as oil coolers, aftercoolers and radiators include heat exchangers that include longitudinally (laterally) extending and are arranged one above the other in parallel at intervals. The aluminum fluid passing hollow part, the aluminum spacer (spacer) that is arranged on the left end and the right end between each pair of adjacent fluid passing parts and brazed to the fluid passing part, and is arranged on each pair of adjacent Corrugated aluminum cooling fins between and brazed between the fluid passage parts and between the left and right spacers, each of the fluid passage parts comprising a flat hollow body having an upper planar wall and a lower a planar wall and a circumferential wall interconnecting the upper and lower walls along their circumferential edges, each of the upper and lower walls of the flat hollow body is formed with a hole at each of its left and right ends, and Each of the left and right spacers has a through hole communicating with corresponding holes in the upper and lower walls of the flat hollow body, a pair of vertically extending left and right headers, each header The tubes consist of all spacer blocks at each of the left and right ends of the heat exchanger and the portion of the hollow flat body between the spacer blocks at the end of the exchanger (see publication JP-A No. 2001-82891 and JP-A No. 1996-233476).

The flat hollow body comprises two flat plates arranged one above the other at a distance, each made of an aluminum brazing sheet having layers of brazing material on its opposite surfaces, and a An aluminum channel forming body between and brazed to the plates, each of which is formed with a hole on its left and right opposite ends, the channel forming body includes a peripheral edge that makes the two plates interconnected peripheral walls, and a heat transfer surface enlargement interconnecting the longitudinal intermediate portions of the two rectilinear portions of the peripheral wall along opposite sides of the front and rear of the plate, respectively. The two flat plates serve as the upper and lower walls of the flat hollow body, and the circumferential wall of the channel-forming body serves as the circumferential wall of the flat hollow body.

However, conventional heat exchangers have the following problems. Since each pair of adjacent flat hollow body parts has spacers at the left and right opposite ends in the middle thereof, the weight of the exchanger as a whole is relatively large. More specifically, the spacer needs to be provided with a through hole for high-pressure and high-temperature fluid to pass therethrough, so the thickness of the circumferential wall of the spacer defining the hole must be increased, thereby increasing the weight of the spacer and the weight of the entire heat exchanger.

Since a through hole is formed in each spacer block, it is not possible to form a threaded hole in the spacer block for attaching a bracket or bracket to the spacer block. Therefore, a cumbersome process is required to secure the brackets or brackets in place by welding. Although the thickness of the circumferential wall of the spacer block defining the through hole must be increased, if a threaded hole is to be formed in the spacer block for attaching a bracket or bracket to the spacer block, this will cause the entire heat exchanger to weight increased further.

Since the heat exchanger has headers at its left and right ends, respectively, the area of the components in which the high-temperature fluid and the low-temperature fluid are heat-exchanged, that is, the area of the core unit, is relative to the heat exchanger required to install the exchanger. The overall size is small, which limits the effect of improving heat exchange efficiency.

The high temperature fluid flows into one of the headers and then through the flat hollow body into the other header. At the same time, the high-temperature fluid exchanges heat with the low-temperature fluid flowing forward from the rear between a pair of adjacent hollow bodies. In this case, part of the high-temperature fluid flowing in the rear portion of the hollow body can be effectively cooled by the low-temperature fluid, but the low-temperature fluid reaching the front portion of the hollow body already has a higher temperature, so The cooling efficiency of the high-temperature fluid flowing through the front portion of the hollow body is low. Therefore, the overall heat exchange efficiency of the heat exchanger is not completely satisfactory.

An object of the present invention is to overcome the above-mentioned problems and provide a fluid-passing flat hollow body that can be used in a heat exchanger that is lighter in weight and higher in heat exchange efficiency than conventional heat exchangers, and to provide a A heat exchanger comprising such a flat hollow body through which a fluid passes, and a method of manufacturing the same.

Contents of the invention

The invention provides a flat hollow body through which a first fluid passes, the hollow body comprising an upper and a lower plate elongated longitudinally, a peripheral wall interconnecting the peripheral edges of the upper and lower walls, and a peripheral wall interconnecting the peripheral edges of the peripheral wall. The interior of the partition wall is divided into longitudinally extending front and rear two channels, each of the upper and lower walls has two holes formed in its right end, the two holes are respectively in the front and rear of the partition wall. The rear part is spaced apart on the opposite side and in the transverse direction of the upper or lower wall so that the respective channels communicate with the outside through the hole, and the left end of the partition is cut away to keep the two channels communicating with each other.

When the flat hollow body through which the first fluid passes is used as a heat exchanger, the high-temperature fluid is cooled to a certain extent by the low-temperature fluid while flowing through the front passage of the flat hollow body, and then enters the rear passage, and the low-temperature fluid It is heated to a certain extent in the rear part of the gap between adjacent hollow bodies, and then reaches the front part of the gap. Therefore, even if the temperature of the low-temperature fluid reaching the front side portion of the gap is high, the high-temperature fluid flowing in the front passage still has a high temperature, and the temperature difference between the high-temperature fluid and the low-temperature fluid is still large, so that the high-temperature fluid can are effectively cooled. Even if the temperature of the high-temperature fluid flowing in the rear passage is greatly reduced, the low-temperature fluid in the front portion of the gap still has a low temperature, and the temperature difference between the low-temperature fluid and the high-temperature fluid is still large, so that the low-temperature fluid can effectively to cool the high temperature fluid. As a result, the device can achieve high heat exchange efficiency.

The invention provides a second fluid-passing flat hollow body comprising a first flat hollow body. The second flat hollow body comprises an upper and a lower plate that are longitudinally elongate and positioned one above the other and spaced apart, and a plate placed between and brazed to the two plates The channel forming body portion, the channel forming body portion includes two longitudinally extending and respectively arranged on the front and rear opposite sides of the flat plate between the upper and lower flat plate, a straight side bar extending longitudinally and arranged on the two an intermediate rod between the side rods and spaced from the two lateral rods, two heat transfer surface enlargements each such that the intermediate rod and each heat transfer surface enlargement The integral side bars are interconnected and located at the middle part of the height of the bars, and an end bar extending forwardly or rearwardly inwardly from the right end of each side bar integrated with the heat transfer surface enlargement, the end bar The inner ends of the rods are joined and brazed to the front and rear opposite sides of the right end of the middle rod, the left end of which is cut away, and the respective right ends of the two heat transfer surface enlargements are cut away. Cut away, each of the upper and lower plates forms holes in its right end on opposite sides of the front and rear of the middle bar respectively, the upper and lower plates constituting the corresponding upper and lower walls, the upper and the left end of each of the lower two plates are bent towards the other plate, the bent portions overlap each other and are brazed together to form the left wall portion of the peripheral wall, the side bars of the channel forming body constitute the Respective front and rear opposite side wall portions of the peripheral wall, the end bars of the channel-forming body constitute right wall portions of the peripheral wall. When the flat hollow body is used to form a heat exchanger, the hollow body has the same advantages as the already described flat hollow body according to the invention. The strength of the flat hollow body is increased due to the brazing of the outer ends of the end rods of the channel-forming body to the intermediate rod. More specifically, the right end of the middle rod of the channel-forming body is brazed to the portion between the two through holes in the spacer block, and the outer end of the end rod is brazed to this middle rod. Therefore, even if the end rod is subjected to a force acting to the right by the fluid flowing through the flat hollow body, the end rod is prevented from being damaged or broken.

The present invention provides a third fluid-passing flat hollow body comprising said second flat hollow body, wherein each of the upper and lower flat plates is made of aluminum brazing sheet material, and the passage forming body The parts are made of aluminum extrusions. The weight of the flat hollow body can then be further reduced and it becomes easier to manufacture.

The present invention provides a fourth fluid-passing flat hollow body comprising said second flat hollow body, wherein one of the left-end curved portions of the upper and lower flat plates located on the inner side has a channel-forming body with each side The corresponding part of the side rod, the radius of curvature of the corresponding part of the side rod on its inner side is such that no gap is formed between the corresponding part of the side rod and the side rod, and the other curved part on the outside has a connection with the channel forming body. the corresponding part of each side bar, the radius of curvature of the second-mentioned side bar corresponding part on its inner side is such that no gap is formed between the second-mentioned side bar corresponding part and the side bar, And the radius of curvature of each left end curved portion of the upper and lower plates except the portion corresponding to the side bar of the channel forming body is larger than the radius of curvature of the corresponding portion of the side bar on the inner side thereof.

The present invention provides a fifth fluid-passing flat hollow body including said fourth flat hollow body, wherein the radius of curvature of the left-end curved portion of the upper and lower flat plates on the inner side of the corresponding portion of the side bar is at most 0.2mm, and The radius of curvature of the left-end curved portions of the upper and lower plates except for the portion corresponding to the side bar is not smaller than the thickness of the upper and lower plates.

For the fourth and fifth flat hollow bodies, the left end curved portion of the upper or lower flat plate located inside has a portion corresponding to each side bar of the channel forming body, and the side bar corresponding portion is on the inside thereof The radius of curvature is such that no gap is formed between the corresponding portion of the side bar and the side bar, for example, the radius of curvature is at most 0.2 mm. The other curved portion located on the outside has a portion corresponding to each side bar of the channel-forming body, the radius of curvature of the side bar counterpart on its inner side is such that no gap is formed between these side bar counterparts, e.g. The radius of curvature is at most 0.2 mm. Therefore, fluid can be prevented from leaking from between the side bar corresponding portion of the inner curved portion and the side bar, and from between the side bar corresponding portions of the curved portions of the upper and lower two flat plates. The radius of curvature of the portion other than the portion corresponding to the side bar of the channel-forming body in each left-end curved portion of the upper and lower plates is larger than the radius of curvature of the corresponding portion of the side bar on the inner side thereof, for example The radius of curvature is not less than the thickness of the upper and lower flat plates. Therefore, cracks can be prevented from occurring in portions other than the corresponding portion of the side bar, so that the pressure resistance of the left wall portion of the flat hollow body is enhanced, and the cyclic allowable stress (proof stress) is improved. If the portion had the same radius of curvature on the inside as the corresponding portion of the side bar, when the upper and lower plates were bent, cracks would appear in the plate, for example from the outer surface to about half the thickness of the plate, weakening the hollow The pressure resistance and cyclical allowable stress of the left wall portion of the body, and with it the possibility of complete rupture of this curved portion due to long-term use, allowing fluid leakage. If the radius of curvature of the side bar corresponding part of the left end curved part on the inner side of the upper or lower plate and the side bar corresponding part of the left end curved part on the outer side is, for example, a maximum of 0.2 mm, then when the upper and lower plates are bent , cracks will appear in the flat plate from the outer surface to about half the thickness of the plate, but even if the bent portion is used for a long time, it will not be completely broken, because the corresponding part of the side bar of the inner bent portion is brazed to to the side bar, and the side bar counterparts of the outer curved portion are brazed to the inner curved portion.

The present invention provides a sixth fluid-passing flat hollow body comprising said fourth flat hollow body, the height of the left-end curved portion located on the inside of the upper or lower flat plate at a portion other than the corresponding portion of the side bar Such that said portion of the curved portion will not interfere with the arcuate portion of the curved portion located on the outside. This structure eliminates the gap that would otherwise form between the curved portions of the two plates, thereby preventing fluid leakage. If the height of the portion of the inner curved portion other than the corresponding portion of the side bar is such that it interferes with the arc portion of the outer curved portion, when the upper and lower plates are assembled during the manufacture of the heat exchanger, Gaps will be created between the bends and the bends will not be able to be brazed.

The present invention provides a first heat exchanger comprising fluid passage portions extending longitudinally and arranged one above the other in parallel at intervals, located between right end portions of each pair of adjacent fluid passage portions and brazed to the pair a spacer bar on the fluid passing portion, a spacer bar positioned between the left end portions of each pair of adjacent fluid passing portions and brazed to the pair of fluid passing portions, and a spacer bar disposed between each pair of adjacent fluid passing portions and brazed thereon and located between the spacer block and the spacer bar, each of the fluid passing parts includes the above-mentioned flat hollow body through which the first fluid passes, and the spacer block has two through holes, The two through holes communicate with two holes in each of the upper and lower walls of the flat hollow body, respectively.

The present invention provides a second heat exchanger comprising fluid passage portions extending longitudinally and arranged one above the other in parallel at intervals, located between right end portions of each pair of adjacent fluid passage portions and brazed to the pair a spacer block on the fluid passage portion, a spacer bar positioned between the left ends of each pair of adjacent fluid passage portions and brazed to the pair of fluid passage portions, and a spacer bar disposed between each pair of adjacent fluid passage portions and brazed The cooling fins on it and between the spacer block and the spacer bar, each of the fluid passing parts includes one of the above-mentioned second to sixth flat hollow bodies through which the fluid passes, and the spacer block has two passages The two through holes communicate with the two holes in each of the upper wall and the lower wall of the flat hollow body respectively.

These two heat exchangers of the present invention place spacer bars between the left ends of each pair of adjacent flat hollow bodies, so their weight is smaller than conventional heat exchangers in which spacer blocks are arranged at Corresponding position. The spacer bar is only used to create air passage gaps, so it can be smaller in size and lighter in weight than the spacer blocks. This makes the overall weight of the heat exchanger less than conventional heat exchangers. Additionally, for the heat exchanger, threaded holes may be formed in the spacer bar for attaching brackets or bosses to the spacer bar. The bracket or bracket can be fixed in place with easy work. In addition, in the case of adopting the heat exchanger of the present invention, the entire exchanger except the spacer block and the spacer bar is used for exchanging heat between the high-temperature fluid and the low-temperature fluid, so that the components in which the high-temperature fluid and the low-temperature fluid are heat-exchanged The area, ie the area of the core assembly relative to the overall size of the heat exchanger required to install the exchanger is (ratio) larger than conventional heat exchangers to ensure improved heat exchange performance.

For both heat exchangers described above, the spacer block may consist of a single part with two through holes at the front and at the rear, or two parts at the front and at the rear each with a through hole.

The two heat exchangers described may have the following configurations.

Each heat exchanger has a fluid inlet at its front upper end, which communicates with the front channels of all flat hollow bodies and the front through holes of all spacer blocks, and has a fluid inlet at its rear lower end. The fluid outlet communicates with the rear channels of all flat hollow bodies and the rear through holes of all spacer blocks.

Each heat exchanger has a fluid inlet at the front of the upper end of the right wall, which communicates with the front passages of all flat hollow bodies and the front through holes of all spacers, and has a fluid inlet at the lower end of the right wall. There is a fluid outlet at the rear of the body, and the fluid outlet communicates with the rear channels of all flat hollow bodies and the rear through holes of all spacer blocks.

Each heat exchanger has a fluid inlet at the front of the right end of its top wall, which communicates with the front passages of all flat hollow bodies and the through holes at the front of all spacers, and has a fluid inlet at the right end of its top wall. There is a fluid outlet at the rear of the body, and the fluid outlet communicates with the rear channels of all flat hollow bodies and the rear through holes of all spacer blocks.

In each of the heat exchangers, threaded holes are formed on walls of the spacer bar facing in a direction opposite to the fins.

In each heat exchanger, a threaded hole is formed on each of front and rear end surfaces of the spacer bar.

In each heat exchanger, the spacer bar integrally has a ridge extending over the entire length of the spacer bar and projecting outwardly beyond the flat hollow body and on the top surface of the ridge A threaded hole is formed in at least one of the bottom surface and at least one of the front end surface and the rear end surface of the ridge.

The present invention provides a method for manufacturing a heat exchanger, ie the above-mentioned second heat exchanger, which method is characterized in that:

Preparing blanks of channel-forming bodies made of aluminum extrusions, each blank comprising two longitudinally extending straight side bars spaced forward or rearwardly, one longitudinally extending and located on either side An intermediate rod between the rods and spaced apart from the two side rods, and two flat plate portions each interconnecting the intermediate rod and each side rod integral with the flat plate portion and located at the the middle of the height of the plate, the paired upper and lower plates are elongated longitudinally, each spacer block has two through holes spaced forward or rearward, and a spacer bar,

The channel-forming body is formed by cutting off the left and right ends of the central stem of the blank, cutting off the right end of each flat plate portion of the blank by a cut length equal to the cut length of the right end of the middle stem , each flat plate portion of the blank is press-worked to form an enlarged portion of the heat transfer surface, and the right end of the side bar of the blank is bent forward or backward inwardly so that its outer end engages the the front and rear opposite sides of the right end of the middle rod to form the end rod,

each pair of plates is bent toward each other at its left end to form a curved portion, and two holes are formed in the right end of each plate on opposite sides of the center rod, respectively, on the front and rear,

A plurality of subassemblies are arranged one above the other in parallel at certain intervals, each of the subassemblies includes a channel forming body portion placed between the pair of upper and lower flat plates, the spacer block is arranged on each pair of adjacent Between the right ends of the assembly, the two through holes are communicated with the corresponding two holes of each of the plates, and the spacer bar is arranged between the left ends of each pair of adjacent assemblies, and further dissipates heat a sheet is disposed between each pair of adjacent assemblies between the spacer block and the spacer bar, and

brazing each pair of upper and lower flat plates to the side bars, middle bars, and end bars of the channel-forming body between the pair of flat plates, and brazing the bent portions of the pair of flat plates to each other, and further Each pair of adjacent plates is brazed to the spacer blocks, spacer bars and fins located between the pair of plates.

The method for manufacturing a heat exchanger of the present invention can easily realize a second heat exchanger having the above-mentioned advantages.

In the heat exchanger manufacturing method of the present invention, the flat plate is made of aluminum brazing sheet, the blank of the spacer block, the spacer bar and the channel forming body is made of aluminum extruded section, and the cooling fin is made of a thin aluminum plate, and the brazing operation is performed using brazing material melted from the plate. The flat hollow body can thus further reduce its weight and become easier to manufacture.

In the heat exchanger manufacturing method of the present invention, one of the left-end bent portions of the upper and lower flat plates located inside has a portion corresponding to each side bar of the channel forming body, and the side bar corresponding portion is at its The radius of curvature of the inner side is such that no gap is formed between the corresponding part of the side bar and the side bar, the other curved part on the outer side has a part corresponding to each side bar of the channel forming body, the second time The radius of curvature of the mentioned side bar corresponding part on its inner side is such that no gap is formed between the second mentioned side bar corresponding part and the side bar, and in each left end curved part of the upper and lower plates The radius of curvature of the portion other than the portion corresponding to the side bar of the passage forming body is larger on the inner side thereof than the curvature radius of the corresponding portion of the side bar on the inner side thereof. Therefore, it is desirable that the radius of curvature of the left-end curved portion of the upper and lower flat plates corresponding to the side bar is at most 0.2 mm on the inner side thereof, and that the left-end curved portion of the upper and lower flat plates except for the corresponding portion of the side bar The radius of curvature of the portion on its inner side is not less than the thickness of the upper and lower plates. In these cases, the left-end curved portion of the upper or lower plate located on the inner side has a portion corresponding to each side bar of the channel-forming body, and the radius of curvature of the side bar corresponding portion on its inner side is such that No gap is formed between the rod counterpart and the side rod, eg the radius of curvature is at most 0.2 mm. The other curved portion located on the outside has a portion corresponding to each side bar of the channel forming body, the radius of curvature of this side bar counterpart on its inner side is such that no gap is formed between these side bar counterparts, e.g. The radius of curvature is at most 0.2 mm. Therefore, fluid can be prevented from leaking from between the side bar corresponding portion of the inner curved portion and the side bar, and from between the side bar corresponding portions of the curved portions of the upper and lower two flat plates. The radius of curvature of the portion other than the portion corresponding to the side bar of the passage forming body in each left end curved portion of the upper and lower plates is larger than the radius of curvature of the corresponding portion of the side bar on the inner side thereof, for example, the The radius of curvature is not less than the thickness of the upper and lower plates. Therefore, cracks can be prevented from occurring in portions other than the corresponding portion of the side bar, so that the pressure resistance of the left wall portion of the flat hollow body is enhanced, and the cyclic allowable stress is improved.

In the heat exchanger manufacturing method of the present invention, the height of the left-end curved portion of the upper or lower plate at the inner side at a portion other than the corresponding portion of the side bar is such that said portion of the curved portion will not interfere with The arcuate portion of the curved portion located on the outer side interferes. Therefore, the height of the portion of the inner left end curved portion of the upper or lower plate except for the corresponding portion of the side bar is such that this portion does not interfere with the arc portion of the outer curved portion. This eliminates the gap that would otherwise form between the curved portions of the two plates, preventing fluid leakage. If the height of the portion of the inner curved portion other than the corresponding portion of the side bar is such that it interferes with the arc portion of the outer curved portion, when the upper and lower plates are assembled during the manufacture of the heat exchanger, A gap will appear between the bends and the bends will not be able to be brazed.

Description of drawings

FIG. 1 is a perspective view showing the overall structure of an oil cooler in which a fluid-passing flat hollow body of the present invention is used.

FIG. 2 is an exploded perspective view showing a part of the oil cooler of FIG. 1 .

Fig. 3 is a perspective view, partly broken away, showing the fluid-passing flat hollow body of the oil cooler of Fig. 1 , with the heat transfer surface enlargement omitted.

FIG. 4 is a vertical sectional view showing the left end portion of the flat hollow body of the oil cooler on an enlarged scale.

5 is a partially exploded perspective view showing the flat hollow body of the oil cooler of FIG. 1, spacer bars on opposite sides thereof, and left end portions of cooling fins.

FIG. 6 is a partial perspective view showing the same parts as in FIG. 5 .

Fig. 7 is a horizontal sectional view and shows a part of the channel-forming body of the flat hollow body in an enlarged scale.

Figure 8 includes a partial perspective view of the right end of the channel forming body to illustrate the method of manufacturing the body.

Figure 9 includes a partial perspective view of the left end of the channel forming body to illustrate the method of manufacturing the body.

FIG. 10 shows the flow of oil in the oil cooler of FIG. 1 .

Figure 11 shows the flow of oil in another embodiment of an oil cooler in which a flat hollow body through which the fluid passes according to the invention is used.

Figure 12 shows the flow of oil in another embodiment of an oil cooler in which a flat hollow body through which the fluid passes according to the invention is used.

Detailed ways

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

FIG. 1 shows the overall structure of a heat exchanger in which the fluid-passing flat hollow body of the present invention is used, and FIGS. 2 to 7 show the structure of the main part of the exchanger. 8 and 9 further illustrate the method for manufacturing the channel-forming body of the flat hollow body, and FIG. 10 illustrates the flow of a high temperature fluid in the heat exchanger shown in FIG. 1 . In the drawings, the same components are denoted by the same reference numerals.

This embodiment is a heat exchanger suitable for use as an oil cooler for a compressor. Examples of such compressors are load compressors, compressors for gas turbines, compressors for brakes of rail vehicles, etc.

Figure 1 shows an oil cooler 1 comprising flat hollow bodies 2 made of aluminum extending longitudinally and arranged one above the other in parallel at intervals so that high temperature oil can flow through them, located at A spacer block 3 made of aluminum extrusion between the right ends of each pair of vertically adjacent flat hollow bodies 2 and brazed to the same Between the left ends of the parts 2 and brazed to the flat hollow body part forward or backward extending spacer bar 4 made of aluminum extruded section, and arranged in each pair of adjacent flat hollow body parts The air between 2 passes through the gap 5 and is located between the spacer block 3 and the spacer bar 4 and is brazed to the corrugated aluminum fins 6 on the hollow body 2 .

Above the flat hollow body 2 at the upper end of the oil cooler 1 and below the flat hollow body 2 at the lower end of the oil cooler 1 are provided at a distance from these hollow bodies with corresponding aluminum side plates 7 and The aluminum side panels have the same shape and size as the flat hollow body when viewed from above. Between the right end of each flat hollow body part 2 at the upper and lower ends and the right end part of the side plate 7 adjacent to the hollow body part, there is also a spacer block 3 made of extruded aluminum profile. The spacer block 3 is soldered to the hollow body 2 and the side plate 7 . Between the left end of each flat hollow body 2 at the upper and lower ends and the left end of the side plate 7 adjacent to the hollow body, there is also a spacer bar 4 made of aluminum extrusions, which Spacer bars 4 are brazed to the hollow body 2 and to the side plates 7 . An air passing gap 5 is also formed between each flat hollow body 2 at the upper and lower ends and a side plate 7 adjacent to the hollow body, into which corrugated aluminum cooling fins 6 are disposed and brazed to the gap. On the hollow body 2 and the side plate 7. The side plate 7 consists of an aluminum brazing sheet with a layer of brazing material on one of its surfaces, to which the spacer blocks 3 , the spacer bars 4 and the corrugated fins 6 are all brazed.

2 and 3, the flat hollow body 2 comprises longitudinally elongated upper and lower flat panels 8, a peripheral wall 9 interconnected with the peripheral edges of the upper and lower walls (flat panels) 8, and the interior of the wall 9 is divided into The partition wall 12 of the two channels 10 , 11 extends longitudinally. Each upper and lower wall 8 is formed at its right end with two holes 13, 14 located on the front and rear opposite sides of the partition wall 12 and spaced transversely of the wall 8 so that the corresponding Channels 10, 11 communicate with the outside through these holes. As shown at 20, the left end of the partition wall 12 is cut away to keep the two channels 10, 11 communicating with each other. The flat hollow body 2 comprises two rectangular flat plates 15, 16 elongated in the longitudinal direction and arranged one above the other at a certain interval, each of which is made of aluminum with a layer of brazing material on its opposite surfaces. Made of brazing sheet material, and a channel forming body 17 made of aluminum extrusion positioned between the upper and lower plates 15, 16 and brazed to the plates.

Each of the plates 15, 16 has holes 13, 14 formed in respective front and rear portions of its right end. The left end of each of the plates 15, 16 is bent toward the left end of the other plate, ie the upper plate 15 is bent downwards and the lower plate 16 is bent upwards, and these bent portions 15a, 16a overlap each other and are brazed together (See Figures 4 to 6). The two flat plates 15, 16 constitute the upper and lower walls 8, and the bent portions 15a, 16a of the flat plates 15, 16 constitute the left side wall portion 9a.

The channel-forming body 17 comprises two straight side bars 18 extending longitudinally and disposed between the upper and lower plates 15, 16 at their front and rear opposite side edges, a central a rod 19, the middle rod extending longitudinally and disposed between and spaced apart from the two side rods, two heat transfer surface enlargements 21, each of which connects the middle rod 19 and the The partially integral side bars 18 are interconnected and are located at the mid-section of the bar's height, and the end bars 22 are forwardly or rearwardly inward from the right end of the corresponding side bar 18 integral with the end bar. and the inner ends of the end rods are engaged and brazed on the front and rear opposite sides of the right end of the middle rod 19 (see FIG. 7 ). Both side bars 18 , middle bar 19 and end bar 22 are brazed to the upper and lower plates 15 , 16 . The right-hand end of this intermediate rod 19 is brazed to each plate 15 , 16 at its portion between the holes 13 , 14 . A left end portion of the intermediate rod 19 is cut off by a predetermined length, thereby forming a communication portion 20 . The right end portion of each heat transfer surface enlarged portion 21 is cut off by a predetermined length so as to form a hole matching the hole 13 or 14 of the flat plate 15 , 16 . The side bars 18 of the channel-forming body 17 constitute front and rear opposite side wall portions 9 b of the peripheral wall 9 , and the end rods 22 of the body 17 constitute a right wall portion 9 c of the peripheral wall 9 .

The enlarged portion 21 of the heat transfer surface includes a plurality of corrugated strips 23, each of which has an upwardly convex curved portion 23a and a downwardly convex curved portion 23b arranged alternately in the longitudinal direction, and these portions 23a, 23b Interconnected horizontal portions 23c, the corrugated strip sheets 23 are arranged in parallel in the transverse direction of the channel forming body 17 and are connected to each other by the horizontal portions 23c. By means of the strips 23 of the enlarged portion 21, each pair of upwardly curved portions 23a adjacent in the transverse direction of the body 17, and each adjacent pair of downwardly curved portions 23b are positioned longitudinally offset relative to each other. In the enlarged portion 21, the horizontal portion 23c is located between each pair of upwardly curved portions 23a and downwardly curved portions 23b of each corrugated strip 23 adjacent in the longitudinal direction, and a pair of adjacent strips in the transverse direction 23 are connected to each other by a horizontal portion 23c, but it is not always necessary to provide a horizontal portion 23c. In this case, portions where the upwardly curved portion 23a extends into the downwardly curved portion 23b in one adjacent strip 23 intersect with similar portions of the other strip 23 so that the adjacent rods 23 are joined at these portions to form a A whole.

The method of manufacturing the channel forming body portion 17 is shown in FIGS. 8 and 9 . To prepare the channel-forming body, an aluminum extrusion blank is produced, comprising two longitudinally extending straight side bars 18 spaced apart in the transverse direction of the blank, a longitudinally extending An intermediate rod 19 between and spaced from the side rods 18, and two flat plate portions 24 each interconnecting the intermediate rod 19 and each side rod 18 integral with the flat plate portion and Located in the middle of the height of the plate (see Figures 8(a) and 9(a)). Then cut off a predetermined length at the left and right opposite ends of the middle rod 19, and cut off a predetermined length at the right end of each of the flat plate parts 24, which is greater than the cut length of the right end of the rod 19 (see FIG. 8 (b) and 9(b)). Then, each flat plate portion 24 is press-worked to form the heat transfer surface enlarged portion 21 (see FIGS. 8(c) and 9(c)). Then, the right end portion of the side bar 18 is bent forward or backward inwardly so that the outer end of the bar engages with the front and rear opposite sides of the right end of the middle bar 19 (see FIG. 8( d)), and The outer ends of rod 18 are brazed to rod 19 to form two end rods 22 . Incidentally, when manufacturing the heat exchanger 1 described below, the outer ends of the end rods 22 are brazed to the intermediate rod 19 using molten brazing material melted from the flat plates 15 , 16 .

Referring to FIG. 4, one of the curved portions 15a, 16a of the upper and lower flat plates 15, 16 located on the inner side, that is, the curved portion 16a of the lower flat plate 16 has a portion 16b at each end of its front end and rear end, which corresponds to The channels form the side bars 18 of the body 17 and have an inner radius of curvature R1. This radius of curvature R1 is such that no gap is formed between the side bar corresponding portion 16 b and the side bar 18 . For example, this radius R1 is at most 0.2 mm. The other curved portion located on the outside, that is, the curved portion 15a of the upper plate 15 has a portion 15b at each of its front and rear ends corresponding to the side bars 18 of the channel forming body 17 and has a radius of curvature on its inside r1. The radius r1 of curvature is such that no gap is formed between the side bar counterparts 15b, 16b. For example, this radius r1 is at most 0.2 mm. The curved portion 15a, 16a of the upper and lower flat plates 15, 16 has a curvature radius r2 or R2 on its inner side of the portion 15c, 16c other than the corresponding portion 15b, 15b of the side bar, which is larger than the corresponding portion of the side bar. The radius of curvature r1 or R1 of the portions 15b, 16b on their insides is not less than the thickness of the upper and lower plates 15,16. One of the curved portions 15a, 16a of the upper and lower flat plates 15, 16 located on the inner side, that is, the curved portion 16a of the lower flat plate 16, has a height H at its portion 16c other than the side bar corresponding portion 16b smaller than that located on the outer side. A portion of this curved portion, i.e., the height of the portion 15c of the curved portion 15a of the upper plate 15, except for its sidebar counterpart 15b, is such that this portion 16c will not interfere with the curved portion 15a of the upper plate 15. The arcuate portion 15d interferes. According to the present embodiment, the curved portion 16a of the lower plate 16 is located inside and the curved portion 15a of the upper plate 15 is located outside, but the curved portion 15a of the upper plate 15 may be located inside the curved portion 16a of the lower plate 16 instead. In this case, the relationship in size of the bent portion 15a and the bent portion 16a is reversed from the above-mentioned relationship.

Referring to Figure 2, the vertical through holes 26, 27 of the spacer block 3 communicate with the corresponding two holes 13, 14 of the upper and lower walls 8 of the flat hollow body 2, and communicate with the corresponding holes 13, 14 when viewed from above. 14 relative alignment. The end openings of the through holes 26 , 27 of the spacer block 3 provided between the flat hollow body 2 at each of the upper and lower ends of the oil cooler 1 and its adjacent side plate 7 are closed by the side plate 7 .

An aluminum oil inlet pipe 28 is connected by brazing to the front wall of the spacer 3 between the upper horizontal hollow body 2 and the top side plate 7 so as to communicate with the inside of the front through hole 26 of the spacer . An aluminum oil outlet pipe 29 is connected to the rear wall of the spacer 3 between the horizontal hollow body 2 at the lower end and the bottom side plate 7 by brazing so as to communicate with the inside of the rear through hole 27 of the spacer . Therefore, the oil inlet pipe 28 (fluid inlet) is provided at the front upper end of the oil cooler 1 so as to communicate with the front passages 10 of all the flat hollow bodies 2 and the front through holes 26 of all the spacer blocks 3, and the oil outlet pipe 29 (fluid outlet) is provided at the rear lower end of the oil cooler 1 so as to communicate with the rear passages 11 of all flat hollow bodies 2 and the rear through holes 27 of all spacer blocks 3 . The inlet side header 31 is formed by the front part of the right end portion of all flat hollow body parts 2 and the front part of all spacer blocks 3, and this inlet side header pipe 31 can make the right end of the front passage 10 of all flat hollow body parts 2 It communicates with the front through holes 26 of all spacer blocks 3 through the front holes 13 of the upper and lower walls 8 . The outlet side header 32 is formed by the rear part of the right end of all horizontal hollow body parts 2 and the rear part of all spacer blocks 3, and this outlet side header pipe 32 can make the right end of the rear passage 11 of all flat hollow body parts 2 It communicates with the rear through holes 27 of all spacer blocks 3 through the rear holes 14 of the upper and lower walls 8 .

6 and 7, two adjacent spacer bars 4 in the spacer bar 4 are all provided with a threaded hole 34 on each of its left side walls, and this threaded hole is used for bracket 33 or support is attached by screw 35 onto the two spacer bars 4.

The oil cooler 1 is manufactured as follows: plates 15, 16 made of aluminum brazed sheet metal, channel forming body 17 made of aluminum extrusions, spacer blocks 3, spacer rods 4, brazed aluminum The corrugated fins 6 and side plates 7 made of welded sheet metal are arranged in superimposed layers in the specified order, the oil inlet pipe 28 and the oil outlet pipe 29 are installed for the assembly, the resulting assembly is position welded using a suitable method, and brazed together the component. More specifically, the oil cooler 1 is manufactured by arranging a plurality of combinations one above the other in parallel at intervals, each of the combinations comprising upper and lower plates 15, 16 and The channel between the plates forms the body 17, placing the two side plates 7 respectively above the assembly at the upper end and below the assembly at the lower end, between each pair of adjacent assemblies, and at the upper end Spacer blocks 3, spacer rods 4 and corrugated fins 6 are arranged between the assembly of each end of the lower end and the side plate adjacent to the assembly, and the oil inlet pipe 28 and the oil outlet pipe 29 are installed for the assembly, using a suitable method The resulting assembly is tack welded and the assembly is brazed together. At this time, the molten brazing material melted from the flat plates 15, 16 is used to braze the flat plates 15, 16 to the channel forming body 17, the spacer block 3, the spacer bar 4 and the corrugated fins 6, and the end The outer ends of the rods 22 are brazed to the intermediate rod 19 . Incidentally, the spacer blocks 3 are arranged such that the two vertical through-holes 26 , 27 of each such spacer block are aligned with the corresponding two holes 13 , 14 of each of the plates 15 , 16 . The oil inlet pipe 28 and the oil outlet pipe 29 can be respectively connected to the corresponding spacer blocks 3 by welding.

With the oil cooler 1 thus constructed, high-temperature oil can enter the inlet side header 31 through the oil inlet pipe 28, and then flow into all the flat hollow body 2 separately to flow leftward through the front passage 10 of the body, passing through the communicating Portion 20 further flows into rear channel 11 , flows rightward through rear channel 11 into outlet side header 32 and out of oil outlet pipe 29 as shown by arrow Y in FIG. 10 . While flowing through the front passages 10 and rear passages 11 of all flat hollow bodies 2, the oil is cooled by exchanging heat with the low-temperature air flowing through the air passage gap 5 in the direction indicated by the arrow X in FIG. 10 . More specifically, the high-temperature oil is cooled to some extent by the air while flowing through the front passage 10 of the flat hollow body 2, and then flows into the rear passage 11, while the low-temperature air is heated at the rear side portion where the air passes through the gap 5 To a certain extent, then the front side part of the gap 5 is reached. Therefore, even though the temperature of the air reaching the front side portion of the gap 5 is high, the oil flowing in the front passage 10 has a high temperature, and the temperature difference between the oil and the air is large, so that the oil can be effectively cooled. Even though the temperature drop of the oil flowing in the rear passage 11 is large, the temperature of the air in the front portion of the gap 5 is low, and the temperature difference between the air and the oil is large, thereby effectively cooling the oil. As a result, the oil cooler can obtain high heat exchange efficiency.

According to the foregoing embodiments, the heat exchanger of the present invention is suitable for use as an oil cooler, but the heat exchanger is not limited to this application, but can also be used as industrial machines such as load compressors, gas turbine compressors, and for Aftercoolers or radiators for compressors in rail vehicles.

The heat exchanger of the present invention can also be used as an oil cooler for hydraulic equipment of cranes, deck cranes, truck cranes and excavators, machine tools and similar industrial machines.

11 and 12 show another embodiment of an oil cooler. In the case of the oil cooler 1 shown in FIG. 11, the aluminum oil inlet pipe 28 is connected by brazing to the front of the right wall of the spacer block 3 provided between the flat hollow body 2 at the upper end and the top side plate 7. part, so as to communicate with the inside of the front through hole 26 of the spacer. The aluminum oil outlet pipe 29 is connected by brazing to the rear part of the right wall of the spacer 3 arranged between the flat hollow body 2 and the bottom side plate 7 at the lower end, so as to communicate with the rear opening 27 of the spacer. connected internally. Therefore, an oil inlet pipe 28 (fluid inlet) is arranged in front of the upper end of the right wall of the oil cooler 1 so as to communicate with the front channels 10 of all flat hollow bodies 2 and the front through holes 26 of all spacer blocks 3 , The oil outlet pipe 29 (fluid outlet) is arranged on the rear portion of the lower end of the right wall of the oil cooler 1, so as to communicate with the rear passages 11 of all flat hollow bodies 2 and the rear through holes 27 of all spacer blocks 3.

In the case of the oil cooler 1 shown in FIG. 12, an aluminum oil inlet pipe 28 is connected by brazing to the front of the right end of the top side plate 7 so as to communicate with the front through hole 26 of the spacer block 3 at the upper end. connected internally. An aluminum oil outlet pipe 29 is connected to the rear of the right end of the top side plate 7 by brazing so as to communicate with the inside of the rear through hole 27 of the spacer block 3 at the upper end. Therefore, the oil inlet pipe 28 (fluid inlet) is arranged in the front of the right end of the top wall of the oil cooler 1 so as to communicate with the front channels 10 of all flat hollow bodies 2 and the front through holes 26 of all spacer blocks 3 , The oil outlet pipe 29 (fluid outlet) is arranged at the rear portion of the top wall right end portion of the oil cooler 1, so as to communicate with the rear passages 11 of all flat hollow bodies 2 and the rear through holes 27 of all spacer blocks 3.

Incidentally, oil flows through the oil cooler shown in FIGS. 11 and 12 in the same manner as shown in FIG. 10 .

13 and 14 show variants of the spacer bar 4 .

FIG. 13 shows a spacer bar 40 which integrally has a ridge 41 which extends over the entire length of the spacer bar and projects outwardly beyond the flat hollow body 2 . Threaded holes 42 for attaching brackets or brackets to the spacer bar are formed in the top and bottom surfaces of the spine 41 and in the opposite end surfaces of the spine.

Figure 14 shows a spacer bar 45 with two threaded holes 46 formed in the wall of the spacer bar facing in the direction opposite to the corrugated fins 6 for attaching a bracket or bracket to the spacer bar.

Industrial Applicability

The present invention provides a fluid-passing flat hollow body suitable for passing high temperature fluids through heat exchangers such as oil coolers, aftercoolers and radiators for compressors, machine tools, hydraulics and similar industrial machines device.

Claims (17)

1. A flat hollow body through which a fluid passes, the hollow body comprising an upper and a lower plate elongated longitudinally, a peripheral wall interconnecting the peripheral edges of the upper and lower walls, and a peripheral wall of the peripheral wall The interior is divided into two longitudinally extending front and rear partition walls, each of the upper and lower walls having two holes formed in its right-hand end, the two holes being located at the front and rear of the partition wall respectively The left end of the partition wall is cut off to keep the two passages in communication with each other. 2. The flat hollow body through which fluid passes according to claim 1, characterized in that the hollow body comprises longitudinally elongated and positioned one above the other and spaced apart as an upper and a lower plate, and a placement a channel-forming body between and brazed to the two plates, the channel-forming body comprising two longitudinally extending front and rear opposite sides of the plate disposed between the upper and lower plates, respectively straight side bars at the sides, an intermediate bar extending longitudinally and disposed between and spaced from the two side bars, two heat transfer surface enlargements, each of the heat transfer surface enlargements partly interconnects the central bar and each side bar integral with the heat transfer surface enlargement and is located at an intermediate portion of the bar's height, and from each side bar integral with the heat transfer surface enlargement An end rod extending inwardly or forwardly or rearwardly from the right end of the end rod, each inner end of which is joined and brazed to the front and rear opposite sides of the right end of the middle rod, the left end of which is cut away , the respective right end portions of the two heat transfer surface enlargements are cut off, and each of the upper and lower flat plates forms holes in its right end portion on opposite sides of the front and rear portions of the middle rod, respectively, the Upper and lower flat plates constitute the respective upper and lower walls, the left end of each of the upper and lower two flat plates is bent toward the other flat plate, and the bent portions overlap each other and are brazed together, thereby constituting the The left wall portion of the peripheral wall, the side bars of the channel-forming body constitute respective front and rear opposing side wall portions of the peripheral wall, and the end rods of the channel-forming body constitute the right wall portion of the peripheral wall. 3. Fluid-passing flat hollow body according to claim 2, characterized in that each of the upper and lower plates is made of aluminum brazing sheet material and the channel-forming body is extruded from aluminum profiles made. 4. The flat hollow body through which fluid passes according to claim 2, wherein one of the left end curved portions of the upper and lower flat plates positioned at the inner side has a portion corresponding to each side bar of the passage forming body , the radius of curvature of the corresponding part of the side bar on its inner side is such that no gap is formed between the corresponding part of the side bar and the side bar, and the other curved part on the outer side has a Corresponding parts, the radius of curvature of the second-mentioned side bar corresponding part on its inner side is such that no gap is formed between the side bar corresponding parts of the inner and outer curved parts, and each of the upper and lower plates A portion of the left end curved portion other than a portion corresponding to the side bar of the channel forming body has a curvature radius larger than a curvature radius of the side bar corresponding portion on the inner side thereof. 5. The flat hollow body through which fluid passes according to claim 4, wherein the radius of curvature of the corresponding portion of the side bar of the left-end curved portion of the upper and lower flat plates is at most 0.2 mm, and the upper and lower flat plates The radius of curvature of the part other than the part corresponding to the side bar in the curved part of the left end of the left end is not less than the thickness of the upper and lower flat plates. 6. The flat hollow body through which fluid passes according to claim 4, characterized in that, the height of the left-end curved portion at the inner side of the upper or lower plate at a portion other than the corresponding portion of the side bar is such that the curved portion Said portion will not interfere with the arcuate portion of the curved portion located on the outside. 7. A heat exchanger comprising fluid passage portions extending longitudinally and arranged one above the other in parallel at intervals, located between right end portions of each pair of adjacent fluid passage portions and brazed to a spacer block on the pair of fluid passage portions, a spacer bar positioned between left end portions of each pair of adjacent fluid passage portions and brazed to the pair of fluid passage portions, and a spacer bar disposed between each pair of adjacent fluid passage portions and fins brazed thereon and located between the spacer block and the spacer bar, each of the fluid passage portions comprising a fluid passage flat hollow body according to claim 1, the spacer block having two through holes, The two through holes communicate with two holes in each of the upper and lower walls of the flat hollow body, respectively. 8. A heat exchanger comprising fluid passing portions extending longitudinally and arranged one above the other in parallel at intervals, between right end portions of each pair of adjacent fluid passing portions and brazed to a spacer block on the pair of fluid passage portions, a spacer bar positioned between left end portions of each pair of adjacent fluid passage portions and brazed to the pair of fluid passage portions, and a spacer bar disposed between each pair of adjacent fluid passage portions and fins brazed thereon and positioned between the spacer block and the spacer bar, each of the fluid passage portions comprising a flat hollow body through which fluid passes according to any one of claims 2 to 6, the spacer The block has two through holes communicating respectively with two holes in each of the upper and lower walls of the flat hollow body. 9. An industrial machine comprising a heat exchanger for use as an oil cooler according to claim 7. 10. An industrial machine comprising a heat exchanger as an aftercooler according to claim 7. 11. An industrial machine comprising a heat exchanger used as an oil cooler according to claim 8. 12. An industrial machine comprising a heat exchanger as an aftercooler according to claim 8. 13. A method for manufacturing a heat exchanger according to claim 8, characterized in that: Preparing blanks of channel-forming bodies made of aluminum extrusions, each blank comprising two longitudinally extending straight side bars spaced forward or rearwardly, one longitudinally extending and located on either side An intermediate rod between the rods and spaced apart from the two side rods, and two flat plate portions each interconnecting the intermediate rod and each side rod integral with the flat plate portion and located at the the middle of the height of the plate, the paired upper and lower plates are elongated longitudinally, each spacer block has two through holes spaced forward or rearward, and a spacer bar, The channel-forming body is formed by cutting off the left and right ends of the central stem of the blank, cutting off the right end of each flat plate portion of the blank by a cut length equal to the cut length of the right end of the middle stem , each flat plate portion of the blank is press-worked to form an enlarged portion of the heat transfer surface, and the right end of the side bar of the blank is bent forward or backward inwardly so that its outer end engages the the front and rear opposite sides of the right end of the middle rod to form the end rod, each pair of plates is bent toward each other at its left end to form a curved portion, and two holes are formed in the right end of each plate on opposite sides of the center rod, respectively, on the front and rear, A plurality of subassemblies are arranged one above the other in parallel at certain intervals, each of the subassemblies includes a channel forming body portion placed between the pair of upper and lower flat plates, the spacer block is arranged on each pair of adjacent Between the right ends of the assembly, the two through holes are communicated with the corresponding two holes of each of the plates, and the spacer bar is arranged between the left ends of each pair of adjacent assemblies, and further dissipates heat a sheet is disposed between each pair of adjacent assemblies between the spacer block and the spacer bar, and brazing each pair of upper and lower flat plates to the side bars, middle bars, and end bars of the channel-forming body between the pair of flat plates, and brazing the bent portions of the pair of flat plates to each other, and further Each pair of adjacent plates is brazed to the spacer blocks, spacer bars and fins located between the pair of plates. 14. A method for manufacturing a heat exchanger according to claim 13, characterized in that the flat plate is made of aluminum brazing sheet, the blanks of the spacer blocks, spacer bars and channel forming bodies are made of Made of aluminum extrusions, the fins are made from thin aluminum plates and the brazing operation is performed using brazing material melted from the plates. 15. A method for manufacturing a heat exchanger according to claim 13, wherein one of the left-end bent portions of the upper and lower flat plates positioned inside has a bar corresponding to each side bar of the channel-forming body. Corresponding part, the radius of curvature of the corresponding part of the side bar on its inner side is such that no gap is formed between the corresponding part of the side bar and the side bar, and the other curved part on the outer side has each The corresponding part of the side bar, the radius of curvature of the second-mentioned side bar corresponding part on its inner side is such that no gap is formed between the second-mentioned side bar corresponding part and the side bar, and the The radius of curvature of each left end curved portion of the upper and lower plates except for the portion corresponding to the side bar of the passage forming body has a larger radius of curvature on the inner side thereof than that of the corresponding portion of the side bar. 16. A method for manufacturing a heat exchanger according to claim 15, characterized in that the curvature radius of the corresponding portion of the side bar of the left-end curved portion of the upper and lower flat plates is at most 0.2mm on the inner side thereof, and the upper portion The radius of curvature of the left end curved portion of the lower plate except for the portion corresponding to the side bar is not smaller than the thickness of the upper and lower plates. 17. A method for manufacturing a heat exchanger according to claim 15, characterized in that the height of the left end bent portion located inside of the upper or lower plate at a portion other than the corresponding portion of the side bar is such that, Said portion of the curved portion will not interfere with the arcuate portion of the curved portion located on the outside.

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