CN1894553A - Heat exchanger and process for fabricating same - Google Patents

Abstract

An oil cooler (1) to which a heat exchanger of the invention is applied comprises a plurality of flat hollow bodies (2) arranged one above another in parallel at a spacing and extending in a left-right direction, a communication member (3) disposed between left end portions of each adjacent pair of flat hollow bodies (2), and a spacer (4) disposed between right end portions of each adjacent pair of flat hollow bodies (2). The spacer (4) has bores (36) extending therethrough in the front-rear direction. The spacer (4) is disposed at a position corresponding to the cutoff portion of the partition wall (15) in the hollow body (2). A fluid of high pressure can be passed through the flat hollow bodies (2) of the oil cooler (1).

Description

Heat exchanger and manufacturing method thereof

Cross References to Related Applications

This application is an application filed under 35 U.S.C. §111(a) and is entitled to the provisional filing under 35 U.S.C. §111(b) under 35 U.S.C. §119(e)(1) Benefit from the filing date of Application No. 60/532,905.

technical field

The present invention relates to a heat exchanger used as an oil cooler, aftercooler, radiator, etc. of industrial machines such as compressors, machine tools, and hydraulic machines, and also to a method of manufacturing the heat exchanger.

The upper and lower sides and left and right hand sides of FIG. 1 will be referred to herein and in the appended claims as "upper", "lower", "left" and "right", respectively. The downstream side with respect to the direction in which liquid flows through (the space between) each adjacent pair of flattened hollow bodies for heat exchange with the liquid flowing through the hollow bodies will be referred to as "front". direction, ie the direction indicated by the arrow X in Figures 1 and 8, and the opposite direction is referred to as "rear". The terms "upper," "lower," "left," "right," "front," and "rear" are defined for convenience, and each pair of terms may be used interchangeably. Furthermore, in the following specification, the term "aluminum" includes aluminum alloys in addition to pure aluminum.

Background technique

Heat exchangers used as oil coolers, aftercoolers, radiators, etc. in industrial machines include heat exchangers that are arranged one above the other in parallel at a certain interval and extend in the left-right direction A plurality of flat hollow aluminum body parts for high-temperature fluid to pass therethrough; two pairs of adjacent hollow body parts respectively arranged between the left and right end parts and brazed on the adjacent hollow body parts a connecting piece of aluminum through which the adjacent hollow bodies remain in communication with each other; and disposed between and brazed to each pair of adjacent flat hollow bodies and positioned between the left and right connecting pieces corrugated aluminum fins. Each flat hollow body includes upper and lower flat walls, and a peripheral wall interconnecting the peripheries of the upper and lower walls, each of the upper and lower walls of each flat hollow body in its left and right end portions A through hole is formed in each of the left and right connecting members, each of the left and right connecting members has a through hole communicating with the corresponding through holes of the upper wall and the lower wall of the hollow body, and the left end of the flat hollow body and the right end portion and the left and right communication pieces form a pair of vertically extending left and right headers, respectively (see, for example, JP-A No. 2001-82891 and Gazette No. 8-233476).

The flat hollow body comprises: two flat plates arranged one above the other at a certain interval, each flat plate being made of an aluminum brazing sheet material having a brazing material layer on each of its opposite surfaces; An aluminum channel-forming body between and brazed to the two flat plates, each flat plate forming a through hole in each of its left and right ends, the channel-forming body comprising two A peripheral wall interconnected at the periphery of the flat plate; and a heat transfer surface increasing portion interconnecting the longitudinal middle portions of the two linear portions of the peripheral wall at opposite sides of the front and rear of the flat plate respectively.

However, conventional heat exchangers have the following problems. The weight of the two communicating pieces disposed respectively between each pair of adjacent flat hollow bodies makes the overall weight of the heat exchanger relatively large. Since the communication piece must have a through hole for high temperature and high pressure fluid to pass therethrough, the wall thickness of the portion of the communication piece surrounding the through hole needs to be increased, thus increasing the weight of the communication piece and thus the weight of the entire heat exchanger. The paired headers respectively arranged on the left and right sides of the heat exchanger make the area of the heat exchange part between the high-temperature fluid and the low-temperature fluid, the so-called heat exchange core, relative to the overall size required for the heat exchanger to be installed Smaller, which limits the improvement of heat exchange efficiency. The high temperature fluid flows into one header and then through the flat hollow body into the other header. During this period, the fluid exchanges heat with the low-temperature fluid flowing through the gap between each adjacent pair of hollow bodies from back to front. The high-temperature fluid portion flowing through the rear side portion of the hollow bodies is effectively cooled in this case, but the temperature of the low-temperature fluid portion reaching the front side portion of the gap between the hollow bodies has been raised to a higher temperature, thereby The high-temperature fluid portion flowing through the front side portion inside the hollow body is not effectively cooled. Therefore, the overall heat exchange performance still needs to be improved.

Therefore, the applicant has previously proposed a heat exchanger that overcomes these problems. The proposed heat exchanger includes: a plurality of flat hollow bodies arranged one above the other in parallel at a certain interval and extending in the left-right direction; a communicating piece arranged between left end portions of each pair of adjacent flat hollow bodies, The connecting piece is used to keep the adjacent pair of flat hollow bodies communicated with each other through the connecting piece; the spacer bar is arranged between the right ends of each pair of adjacent flat hollow body portions; each flat hollow body portion includes The upper and lower flat walls elongated in the direction, the peripheral wall interconnecting the upper and lower walls at their periphery, and the partition wall dividing the interior of the hollow body into two straight passages extending in the left and right directions, each of the upper and lower The left end portion of the lower wall is respectively provided with two through holes spaced apart along the front and rear directions at its front and rear regions on the opposite sides of the partition wall, so that each channel communicates with the connecting member through the through holes, and the partition wall The right end is cut off to keep the two passages communicating with each other through the cut away part, and the left and right width of the partition bar is much smaller than the left and right length of the cut left end of the partition wall of the flat body (see publication JP-A No.2004-184057 ).

In the heat exchanger disclosed in the publication JP-A No. 2004-184057, each flat hollow body includes two upper and lower flat plates elongated in the left-right direction and arranged one above the other at a certain interval, and a channel-forming body disposed between and brazed to the two flat plates, the channel-forming body comprising: two straight side bars at the front and rear of the upper and lower flat plates, respectively The upper side is arranged between the flat plates and extends in the left-right direction; the middle strip is located between the two side strips and spaced apart from them, and the middle strip extends in the left-right direction; between the middle strip and each side strip two heat transfer area increasing portions integrally formed with the bars and disposed in the middle of the height of the bars; and two end bars extending inwardly forward or backward integrally with the left ends of the side bars, respectively , the inner ends of the end strips lean against and are brazed on the left end of the middle strip at the front and rear sides of the middle strip respectively; the right end of the middle strip is cut off, and each of the two heat transfer area increasing The left end of one is cut off, and the left end of each upper and lower flat plate forms two through holes in its front and rear regions on opposite sides of the middle bar, respectively, and the upper and lower flat plates form the upper and lower walls respectively , the respective right ends of the upper and lower flat plates are oppositely bent, the bent ends overlap each other and are brazed together to form the right side wall portion of the peripheral wall, and the two side bars of the channel forming body form the front and rear of the peripheral wall The upper wall portion, the end strips of the channel-forming body form the left side wall portion of the peripheral wall, and the middle strip of the channel-forming body forms the partition wall.

The inventors have conducted extensive research and found that the proposed heat exchanger may have the following problems. At the portion of the channel-forming body where the middle bar is cut away, the upper and lower flat plates are only brazed to the side bars, so that the strength of the flat plate at this location is reduced. Although the fluid presents no problems at low pressures, when the fluid flows within the flat hollow body at high pressures, the plates can expand or other problems can arise.

It is an object of the present invention to overcome the above-mentioned problems and to provide a heat exchanger through which a high-pressure fluid can pass through a flat hollow body.

Contents of the invention

In order to achieve the above object, the present invention includes the following modes:

1) A heat exchanger comprising: a plurality of flat hollow bodies arranged one above the other in parallel at a certain interval and extending in the left-right direction; arranged at the left end of each pair of adjacent flat hollow bodies The communication piece between, and this communication piece is used for keeping each pair of adjacent hollow body parts to communicate with each other through this communication piece; The spacer of block form that is arranged between the right end of each pair of adjacent flat hollow body parts; Each The flat hollow body includes upper and lower flat walls elongated in the left-right direction, a peripheral wall interconnecting the upper and lower walls at their peripheries, and a branch dividing the interior of the hollow body into two straight passages extending in the left-right direction. In the partition wall, the left end of each upper and lower wall is respectively provided with two through holes spaced apart in the front and rear directions in its front and rear regions on opposite sides of the partition wall, and these two through holes are used to make the passages The right end portion of the partition wall is cut off to keep the two passages communicated with each other through the cut-off portion through which it communicates with the communicating piece, the spacer has a through hole extending therethrough in the front-rear direction, and the spacer is connected to the spacer. The cut-out parts of the partition wall of the flat hollow body are arranged correspondingly.

2) The heat exchanger according to paragraph 1), wherein the left-right width of the spacer is larger than the length of the cut-out portion of the partition wall in the left-right direction.

3) The heat exchanger according to paragraph 1), wherein the spacer has a plurality of holes extending through the spacer in the front-rear direction and arranged side by side in the left-right direction.

4) The heat exchanger according to paragraph 1), wherein the spacer has an inner peripheral surface defining a hole and having a plurality of ridges and/or grooves extending in the longitudinal direction of the hole.

5) The heat exchanger according to paragraph 1), wherein each flat hollow body includes two upper and lower flat plates elongated in the left-right direction and arranged one above the other at a certain interval, and A channel-forming body between and brazed to the plates, the channel-forming body comprising: two straight side bars disposed at the front and rear sides of the upper and lower flat plates, respectively between the upper and lower flat panels and extending in the left-to-right direction; between and spaced apart from the two side bars, a middle bar extending in the left-to-right direction; between the center bar and each of the side bars two heat transfer area increasing parts integrally formed and provided in the middle of the height of these bars; The inner ends of the bars lean against and are brazed on the left end of the middle bar at the front and rear sides of the middle bar respectively; and the left end of each of the lower flat plates respectively form two through holes in the front and rear regions on the opposite sides of the middle bar, the upper and lower flat plates form the upper wall and the lower wall respectively, and the upper and lower flat plates respectively form two through holes. The respective right ends of the plates are oppositely bent, the bent ends are overlapped and brazed together to form the right wall portion of the perimeter wall, the two side bars of the channel forming body form the front and rear side walls of the perimeter wall part, the end strip of the channel forming body forms the left wall part of the peripheral wall.

6) The heat exchanger according to paragraph 5), wherein both the upper and lower flat plates are made of aluminum brazing sheets, and the channel-forming body comprises aluminum extrusions.

7) An industrial machine comprising a heat exchanger according to any one of paragraphs 1) to 6), the heat exchanger being used as an oil cooler.

8) An industrial machine comprising a heat exchanger according to any one of paragraphs 1) to 6), the heat exchanger being used as an aftercooler.

9) A method of manufacturing a heat exchanger according to paragraph 1), characterized in that channel-forming bodies are prepared, each body comprising: two straight sides arranged at intervals in the front-rear direction and extending in the left-right direction a central strip between the two side strips and spaced apart from them, the central strip extending in the left-right direction; Two flat plate parts in the middle of the height; prepare a pair of upper and lower flat plates elongated in the left-right direction, prepare each connecting member with two through holes spaced apart from each other in the front-rear direction and extend vertically, and prepare each with a spacer through a hole therethrough in a front-to-rear direction,

Manufacture the channel-forming body portion with each blank in such a way that the left and right opposite ends of the middle strip of the blank are cut off, the left end of each flat plate portion of the blank is cut, and the length of the left end of the cut flat plate is greater than the length of the cut. The length of the left end of the middle bar of the green body, the two flat plate parts of the green body are press-worked to form the heat transfer area increasing part, and the left end of the side bar of the green body is bent inwardly to the left or right so that The inner ends of the side bars rest against the front and rear sides of the middle bar respectively to form end bars,

Oppositely bending the right end portions of each pair of upper and lower flat plates to form a bend, and forming two through holes in the area of the left end portion of each flat plate to be placed on the front and rear opposite sides of the middle bar ,

making a plurality of combinations each comprising formed pairs of upper and lower flat plates and a passage forming body disposed therebetween, arranging the combinations one above the other in parallel at a certain interval, communicating pieces are provided between left end portions of each pair of adjacent assemblies so as to allow two through holes to communicate with respective through holes of each flat plate, spacers are provided between right end portions of each pair of adjacent assemblies, and positioning the corrugated fins between the feeders and spacers between each pair of adjacent assemblies, 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, brazing the inner ends of the end bars to the middle bars, And the bending parts of each pair of flat plates are brazed together, and each flat plate is further brazed to its adjacent connecting piece, spacer and fin.

10) The method of manufacturing a heat exchanger according to paragraph 9), wherein each flat plate is made of an aluminum brazing sheet, each connecting piece, spacer and channel forming blank is made of an aluminum extruded section, and the fins Constructed from thin sheets of aluminum and brazed with brazing material that is released from the flat sheets when molten.

11) The method of manufacturing a heat exchanger according to paragraph 9), wherein the left-right width of the spacer is larger than the cut-off length of the right end portion of the middle bar of the channel-forming body in the left-right direction.

12) The method of manufacturing a heat exchanger according to paragraph 9), wherein each spacer has a hole extending therethrough in the front-rear direction.

13) The method of manufacturing a heat exchanger according to paragraph 9), wherein each spacer has an inner peripheral surface defining a hole and having a plurality of ridges and/or grooves extending longitudinally of the hole.

For the heat exchanger described in paragraph 1), the spacer is positioned corresponding to the cut-out portion of the partition wall of the flat hollow body, so that even in the absence of a partition interconnecting the upper and lower walls of the flat hollow body It is also possible to prevent the strength of the upper and lower walls from being lowered at portions of the partition wall portion. Therefore, even when high-pressure fluid flows in the hollow body, the upper and lower walls are prevented from expanding, and high-pressure fluid can flow through the hollow body. In addition, the weight of the spacer is smaller than when the spacer has no holes extending therethrough, so that the weight of the heat exchanger as a whole can be prevented from increasing. Fluid such as cold air for cooling the high-temperature fluid flowing in the flat hollow body of the heat exchanging member flows through the through holes of the spacer, so that the spacer also contributes to heat exchange, thereby being different from using a spacer without through holes. The high-temperature fluid flowing in the hollow body can be cooled more efficiently than that.

With the heat exchanger described in paragraph 2), the width of the spacer is greater than the length of the cut-out portion of the partition wall of the hollow body in the left-right direction. This can reliably prevent the strength of the upper and lower walls from being weakened at the portion of the flat hollow body where there is no partition wall portion interconnecting the upper and lower walls, so that the upper part can be reliably prevented when a high-pressure fluid passes through the hollow body. and the lower wall swells or other problems arise. Thus, high pressure fluid can pass through the hollow body.

For the heat exchanger described in paragraph 3), the portion of the spacer between adjacent pairs of holes serves to reinforce the upper and lower walls of the flat hollow body. Therefore, it is possible to more reliably prevent the strength of the upper and lower walls from being weakened.

For the heat exchanger described in paragraph 4), the inner peripheral surface of the spacer defining the hole has ridges and/or grooves extending in the longitudinal direction of the hole. This can increase the heat transfer area between the high-temperature fluid flowing in the hollow body and the low-temperature fluid flowing through the holes, thereby further improving the cooling efficiency of the high-temperature fluid described above according to paragraph 1).

For the heat exchanger described in paragraph 5), the spacers are positioned in positions corresponding to the cut-outs of the middle strips of the channel-forming body forming the partition walls of the hollow body parts, so that even in the absence of the hollow body parts brazed in these The location of the middle bar on the flat plate still prevents the upper and lower walls from becoming weaker and thus from expanding even if a high pressure fluid flows inside the hollow body. Thus, high pressure fluid can pass through the hollow body. The strength of the flat hollow body can be increased by brazing the inner ends of the end strips of the channel-forming body to the middle strip. More specifically, the left end of the middle bar of the channel forming body is brazed at the portion of the upper and lower plates between the two through holes, and the inner end of the end bar is brazed to the middle bar. Therefore, even when the end bar is subjected to a leftward force exerted thereon by the fluid flowing inside the hollow body, the end bar is prevented from breaking.

The overall weight of the heat exchanger according to paragraph 6) is reduced and easy to manufacture.

A heat exchanger having the advantages described with reference to paragraph 1) can be easily produced by the method according to paragraph 9).

When using the method described in paragraph 10), the heat exchanger can be manufactured more easily and the weight of the heat exchanger can be further reduced.

A heat exchanger having the advantages described with reference to paragraph 2) can be easily produced using the method according to paragraph 11).

A heat exchanger having the advantages described with reference to paragraph 3) can be easily produced using the method according to paragraph 12).

A heat exchanger having the advantages described with reference to paragraph 4) can be easily produced using the method according to paragraph 13).

Description of drawings

1 is a perspective view showing the overall configuration of an oil cooler using a heat exchanger of the present invention;

Fig. 2 is an exploded perspective view showing a part of an oil cooler;

Fig. 3 is a partially omitted perspective view showing the flat hollow body of the oil cooler, wherein the increased heat transfer area is omitted;

Figure 4 is a vertical sectional view showing the right end of the flat hollow body of the oil cooler on an enlarged scale;

Figure 5 is a partial perspective view of the left end of the channel-forming body of the hollow body, illustrating a method of manufacturing the channel-forming body;

Figure 6 is a partial perspective view of the right end of the channel-forming body of the hollow body, illustrating a method of manufacturing the channel-forming body;

7 is an exploded perspective view showing a lower end portion of an oil cooler;

Figure 8 is a diagram showing how oil flows through an oil cooler;

Fig. 9 is a perspective view of a modification of the spacer.

Detailed ways

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

Fig. 1 shows the overall configuration of the heat exchanger of the present invention, and Figs. 2 to 4 and Fig. 7 show the configuration of the main part of the heat exchanger. Figures 5 and 6 illustrate a method for producing a channel forming body of a flat hollow body, while Figure 8 illustrates the flow of a high temperature fluid through a heat exchanger. In these figures, the same parts are indicated by the same reference numerals.

This embodiment is an oil cooler for a compressor using the heat exchanger of the present invention. Examples of such compressors are load compressors, compressors for gas turbines, compressors for braking of rail vehicles, etc.

Fig. 1 shows an oil cooler 1 comprising: a flat hollow aluminum body 2 arranged one above the other at a distance and extending in the left-right direction, that is, in the transverse direction of the cooler 1, for Pass high-temperature oil therethrough; a connecting piece 3 made of aluminum extruded section, which is arranged between the left ends of each pair of vertically adjacent flat hollow bodies 2 and brazed to the adjacent pair of flat hollow bodies 2 On the hollow bodies 2, the communication piece is used to keep the hollow bodies communicating with each other through the communication piece; the spacer 4 made of aluminum extruded section, which is arranged at the right end of each pair of adjacent flat hollow bodies 2 part and brazed on the adjacent pair of flat hollow body parts 2; The air between the hollow bodies 2 passes through the gap 5 and is brazed on the adjacent pair of flat hollow bodies 2 .

An inlet-outlet piece 7, made of aluminum extrusion and having the same thickness and size as the connecting piece 3, is arranged below the left end of the flat hollow body 2 at the lower end of the oil cooler and is brazed in this end hollow on body 2. A spacer 4 identical to the spacer between the flat hollow bodies 2 is similarly arranged below the right end of the end hollow body 2 and is brazed to the body 2 . The left end portion of the lower side plate 8 elongated in the transverse direction of the cooler 1 is brazed to the right end portion of the lower surface of the inlet-outlet member 7 , while the right end portion of the side plate is brazed to the entire lower surface of the spacer 4 . The space between the lower side plate 8 and the end hollow body 2 can also be used as an air passage gap 5, in which a corrugated fin 6 is provided, which is brazed between the lower side plate 8 and the end hollow body 2 on. The lower side plate 8 comprises an aluminum brazing sheet having a brazing material layer on its upper surface.

The same communication piece 3 as the communication piece 3 between the flat hollow body parts 2 is provided at the upper part of the left end part of the flat hollow body part 2 at the upper end part of the oil cooler 1, and is brazed to the upper end part hollow body part 2 superior. The same spacer 4 as the spacer 4 between the flat hollow bodies 2 is similarly provided on the upper portion of the right end of the upper end hollow body 2 and brazed on the body 2 . The left end of the upper side plate 9 elongated in the transverse direction of the cooler 1 is brazed to the entire upper surface of the communicating member 3 , while the right end of the side plate is brazed to the entire upper surface of the spacer 4 . The space between the upper side plate 9 and the upper hollow body 2 can also be used as an air passage gap 5 in which the corrugated fins 6 are arranged. The fins 6 are soldered to the upper side plate 9 and the upper hollow body 2 . The upper side plate 9 comprises an aluminum brazing sheet material having a brazing material layer on its upper surface.

2 and 3, the flat hollow body 2 includes upper and lower walls 11 elongated in the transverse direction of the cooler 1, a peripheral wall 12 interconnecting the upper and lower walls 11 at their peripheries, and the hollow body 2. The interior is divided by a partition wall 15 into two front and rear channels 13 , 14 extending in the transverse direction of the cooler. The left end portion of each upper and lower wall 11 is respectively provided with two through holes 16, 17 spaced apart along the front-rear direction in its front and rear regions on opposite sides of the partition wall 15, so that each passage 13, 14 communicates with the outside through the through hole. The right end of the partition wall 15 is cut off to keep the two passages 13, 14 communicating with each other therethrough. Connected parts are indicated by 18 . The flat hollow body 2 comprises two rectangular flat plates 19, 21 made of aluminum brazing sheet material with layers of brazing material on their opposite sides, elongated transversely of the cooler and vertically spaced apart ; and a channel-forming body 22 made of aluminum extrusion, which is arranged between the upper and lower flat plates 19, 21 and is brazed thereon.

Through holes 16, 17 are formed in the front and rear regions of the left end portion of each flat plate 19, 21, respectively. The respective right end portions of the two flat plates 19, 20 are oppositely bent. More specifically, the right end of the upper flat plate 19 is bent downward, while the right end of the lower flat plate 21 is bent upward to form bent portions 19a, 21a, which are overlapped and brazed together (see FIG. 4). Two flat plates 19 , 21 form the upper and lower wall 11 , the curved portions 19 a , 21 a of the two flat plates 19 , 21 form the right wall portion 12 a of the peripheral wall 12 .

The channel-forming body 22 comprises two straight side bars 23 disposed between the upper and lower flat plates 19, 21 at their front and rear sides, respectively, and along the cooling The lateral extension of the cooler 1; between the two side bars 23 and a middle bar 24 spaced apart from them, the middle bar extends laterally along the cooler 1; between the middle bar 24 and each side bar 23 and these bars two heat transfer area increasing portions 25 integrally formed and provided in the middle of the height of these bars; and two end bars 26 integrally extending forwardly or backwardly inwardly from the left end of the side bar 23, respectively, The inner ends of the end strip rest and are soldered to the left end of the middle strip 24 at the front and rear sides of the middle strip 24 respectively. Two side bars 23 , a middle bar 24 and two end bars 26 are soldered to the upper and lower flat plates 19 , 21 . The left-hand end of the central strip 24 is soldered to the two flat plates 19 , 21 at their portion between the two through-holes 16 , 17 . The right end portion of the middle bar 24 is cut off by a predetermined length to form the communication portion 18 . Left end portions of the two heat transfer area increasing portions 25 are cut off to a specified length to form through holes aligned with the respective through holes 16 , 17 in the flat plates 19 , 21 . The side strips 23 of the channel forming body 22 form the front and rear wall portions 12b of the peripheral wall 12 and the end strips 26 of the body 22 form the left side wall portion 12c of the peripheral wall 12 .

Referring to FIG. 4, the heat transfer area increasing portion 25 includes a plurality of corrugated strips 27, each of which includes upwardly curved portions 27a and downwardly curved portions 27b arranged alternately along the transverse direction of the portion 25 and interconnected by a horizontal portion 27c, The corrugated strips 27 are arranged in the front-to-rear direction and are interconnected in one piece by horizontal portions 27c. In each pair of adjacent corrugated strips 27 of section 25, the upward curvature 27a of one corrugated strip is offset from the upward curvature 27a of the other strip along the transverse direction of section 25, and the downward curvature 27b of one corrugated strip is along the lateral direction of section 25. Those downward bends 27b are laterally offset from the other strip. For each corrugated strip 27 of the heat transfer area increasing portion 25, there is a horizontal portion 27c between each pair of laterally adjacent upwardly curved portions 27a and downwardly curved portions 27b, and each pair of adjacent corrugated strips 27 before and after They are joined to each other at the horizontal portion 27c, but it is not always necessary to provide the horizontal portion 27c. In each pair of adjacent corrugated slats 27, where the upward bend 27a in one slat extends to the point where the portion of the downward bend 27b extends across the same portion of the other slat, the two slats may be in these portions. joint together.

The channel-forming body 22 is made in the manner shown in FIGS. 5 and 6 . Make channel to form blank 29, the form of each blank is an aluminum extruded profile, and each blank 29 comprises: along the front and rear direction with a certain interval and extend along the two straight side bars 23 of left and right direction; Between the two side bars 23 and spaced apart from them, the middle bar 24 extends in the left-right direction; The two flat plate portions 28 in the middle of the height [see Figures 5(a) and 6(a)]. Then the left and right opposite ends of the middle strip 24 of each blank 29 are cut off to a specified length, and the left end of each of the two flat plate portions 28 of the blank is cut off to a length greater than The length by which the left end portion of the middle strip 24 is cut off [see FIGS. 5(b) and 6(b)]. Subsequently, the two flat plate portions 28 of the blank are press-worked to form the heat transfer area increasing portion 25 [see FIGS. 5(c) and 6(c)]. Thereafter, the left end of the side strip 23 of the blank is bent inwardly to the left or right, so that the inner end of the side strip 23 leans against the front side and the back side of the middle strip 24 respectively [see Fig. 5 (d) ], and the inner end is brazed on the middle strip 24 to form two end strips 26. In this way, the channel forming body portion 22 is made. When manufacturing the unitary heat exchanger 1 in a manner that will be described later, the inner ends of the end strips 26 are brazed to the middle strip 24 using molten brazing material released from the flat plates 19, 21 upon melting. .

As shown in FIG. 2, when viewed from above, the front and rear two vertical through holes 31, 32 of each communicating member 3 are arranged to be aligned with the two through holes of the upper and lower walls 11 of the flat hollow body 2. 16,17 are aligned with each other so as to communicate with these holes 16,17. The front sides of the front ends of all the flat hollow bodies 2 and the front sides of all the communication pieces 3 form an inlet header 33A (see FIG. 8 ). In the inlet header 33A, the left ends of the front channels 13 of all the flat hollow bodies 2 communicate with the front vertical through holes 31 of all the communication members 3 through the front through holes 16 of the upper and lower walls 11 . The rear sides of the rear ends of all flat hollow bodies 2 and the rear sides of all communication pieces 3 form an outlet header 33B (see FIG. 8 ). In the outlet header 33B, the left ends of the rear channels 14 of all the flat hollow bodies 2 communicate with the rear vertical through holes 32 of all the communication members 3 through the rear through holes 17 of the upper and lower walls 11 .

The upper end openings of the two vertical through holes 31 , 32 of the connecting piece 3 arranged on the upper side of the left end portion of the flat hollow body 2 at the upper end of the oil cooler 1 are closed by the upper side plate 9 .

Referring to FIG. 7, the part of the inlet-outlet member 7 facing left along the left end of the lower side plate 8 has two vertical through holes 34, 35 at the front and rear, which are respectively connected to the lower end of the cooler 1. The respective through holes 16, 17 of the bottom wall 11 of the flat hollow body communicate with each other. These through holes 34, 35 have internally threaded inner peripheries 34a, 35a.

As shown in FIG. 2 , the transverse width of the spacer 4 is greater than the length of the cut-away portion of the middle strip of the channel-forming body 22 , that is, the transverse length of the communication portion 18 . The spacer 4 also has a plurality of holes 36 extending through the spacer in the front-rear direction and arranged side by side in the lateral direction.

The oil cooler 1 is manufactured by forming assemblies each comprising a pair of flat plates 19, 21 made of aluminum brazing sheet material and a passage forming body 22 provided between the pair of flat plates at a certain interval. Place the assemblies one above the other in parallel, between the left ends of each pair of adjacent assemblies a communication piece 3 is provided to allow the two through-holes 31, 32 to communicate with the respective through-holes 16, 17 of the flat plates 19, 21 Connected, spacer 4 is set between the right ends of each pair of adjacent assemblies, and corrugated fins 6 are arranged between the communication piece 3 and the spacer 4 between each pair of adjacent assemblies, and the formed assembly The lower end of the inlet-outlet part 7, the spacer 4, the corrugated fin 6 and the lower side plate 8 are arranged under the assembly, and the connecting part 3, the spacer 4, the corrugated fin 6 and the upper side plate 9 are arranged at the upper end of the assembly On the upper side of the assembly, the formed assembly is positioned using suitable means and welded together. At this point, the end strips 26 of each channel-forming body 22 are brazed to the middle strip 24 of that channel-forming body using molten brazing material released from the flat plates 19, 21 upon melting.

With the above-mentioned oil cooler 1, as indicated by the arrow Y in FIG. 8, the high-temperature oil flows into the inlet header 34A through the front vertical through-hole 34 of the inlet-outlet member 7, and then flows into all the flat hollow bodies 2 in a divided manner to Flow through the front channel 13 of this flat hollow body to the right, flow into the rear channel 14 via the communication part 18, then flow left through the rear channel 14 into the outlet header 33B, and pass through the rear of the inlet-outlet piece 7 vertically Outflow through hole 35 . While flowing through the front channels 13 and the rear channels 14 of all flat hollow bodies 2 , the oil exchanges heat with cooling air having a low temperature and flowing forward (see arrow X) through the air-pass gap 5 . At this time, the oil is also cooled by the spacer 4, so that the cooling efficiency can be improved.

In the case of high pressure oil flowing inside the flat hollow body 2, the upper and lower walls 11 of the hollow body 2, ie the upper and lower flat plates 19, 21 are not brazed to the intermediate piece 24 adjacent thereto The part of the plate 19, 21 corresponding to the connecting part 18 will be subjected to a large outward force, but such force is received by the spacer 4, which prevents the upper and lower walls 11, that is, the upper and lower parts. The flat plates 19, 21 expand outwards.

In the foregoing embodiment, as shown in FIG. 9 , the inner peripheral surface of the spacer 4 defining the hole 36 extending therethrough has a plurality of ridges 40 extending in the front-rear direction. These ridges 40 increase the heat transfer area between the spacer 4 and the cold air flow to obtain further improved cooling efficiency. Instead of or in addition to the ridge 40 , a plurality of grooves extending in the front-rear direction may be formed in the inner peripheral surface defining the hole 36 .

In the above-described embodiment, the transverse width of the spacer 4 is greater than the length of the cut-away portion of the middle strip 24 of the channel-forming body 22, that is, the transverse length of the communicating portion 18, but this is not limitative; the transverse width of the spacer 4 It may be smaller than the lateral width of the connecting portion 18 . For example, even if the lateral width of the spacer 4 is smaller than the lateral width of the communicating portion 18 by a certain amount corresponding to the lateral width of the upwardly or downwardly bent portions 27a, 27b of the corrugated strips 27 of the passage forming body 22, The upper and lower walls 11, ie the upper and lower side panels 19, 21 are prevented from expanding outward.

Although the heat exchanger according to the above-described embodiments is directed to an oil cooler for a compressor, the application is not limiting; aftercooler or radiator. In addition, an aftercooler or radiator of suitable configuration can be assembled integrally with an oil cooler including the heat exchanger of the present invention.

The heat exchanger of the present invention can be used as an oil cooler for cooling oil used in machine tools or hydraulic devices for stand-alone cranes or deck cranes, truck cranes, excavators, and the like.

industrial application

The present invention provides a heat exchanger used, for example, as an oil cooler, aftercooler, radiator, etc. of industrial machines such as compressors, machine tools, and hydraulic equipment.

Claims (13)

1. heat exchanger, this heat exchanger comprises: a plurality of flat hollow body part that is provided with abreast above another and extends along left and right directions at certain intervals; Be arranged on every pair of connectedness between the adjacent flat hollow body part left part, this connectedness is used to keep every pair of adjacent hollow body part to be interconnected by this connectedness; Be arranged on the distance piece of every pair of bulk form between the adjacent flat hollow body part right part; Each flat hollow body part comprises along the top flat wall and the bottom flat wall of left and right directions elongation, make top wall and lower part wall perisporium in their periphery interconnection, and the partition walls that the inside of hollow body part are divided into two straight channel of extending along left and right directions, the left part of each top wall and lower part wall is provided with two along the isolated through hole of fore-and-aft direction in its front and rear zone that is positioned at the partition wall opposite side respectively, these two through holes are used to make each passage to be communicated with connectedness by it, the right part of partition wall is cut to keep described two passages to be interconnected by this cut part, described distance piece has along fore-and-aft direction and extends through wherein through hole, and the cut part of the partition wall of this distance piece and flat hollow body part is settled accordingly.

2. heat exchanger according to claim 1 is characterized in that, the left and right sides width of distance piece is greater than the cut part of the partition wall length along left and right directions.

3. heat exchanger according to claim 1 is characterized in that distance piece has a plurality of holes, and these a plurality of holes extend through distance piece and are arranged side by side along left and right directions along fore-and-aft direction.

4. heat exchanger according to claim 1 is characterized in that distance piece has inner peripheral surface, and this inner peripheral surface limiting hole also has along a plurality of spines and/or the groove of the longitudinal extension in hole.

5. heat exchanger according to claim 1, it is characterized in that, each flat hollow body part comprises along left and right directions elongation and two flats in a upper and lower that is provided with above another at certain intervals, and be arranged between these two flats and soldering tunnel-shaped thereon becomes body, this tunnel-shaped becomes body to comprise: two straight side slats, this side slat are arranged between top flat and the bottom flat and along left and right directions in the front and rear side edge of top flat and bottom flat respectively and extend; Between two side slats and with they isolated central strip, this central strip is extended along left and right directions; Two heat transfer areas at middle part that are integrally formed into and are arranged on these height between central strip and each side slat with these increase parts; And two end bars that extend internally forward or backward from the left end of side slat respectively with being integral with it, the inner end of this end bar respectively the leading flank of central strip and the trailing flank place leans against and the left end of soldering in central strip on; The right part of central strip is cut, the left part of two heat transfer area increase parts is cut, the left part of each in top flat and the bottom flat forms two through holes respectively in its front and rear zone that is positioned at the central strip opposite side, top flat and bottom flat form top wall and lower part wall respectively, the right part separately of top flat and bottom flat is relatively crooked, this crooked end overlaps also soldering mutually together to form the right wall part of perisporium, tunnel-shaped becomes two side slats of body to form the front and rear sidewall sections of perisporium, and tunnel-shaped becomes the end bar of body to form the left wall part of perisporium.

6. heat exchanger according to claim 5 is characterized in that, top flat and bottom flat are made by aluminium soldering sheet material, and tunnel-shaped becomes body to comprise the aluminium extrudate.

7. one kind comprises the industrial machine according to each described heat exchanger in the claim 1 to 6, and this heat exchanger is as oil cooler.

8. one kind comprises the industrial machine according to each described heat exchanger in the claim 1 to 6, and this heat exchanger is as aftercooler.

9. method of making heat exchanger according to claim 1 is characterized in that:

The preparation passage forms base substrate, and each base substrate comprises: two straight side slats that are provided with at certain intervals and extend along left and right directions along fore-and-aft direction; Between these two side slats and with they isolated central strip, this central strip is extended along left and right directions; And two the flat parts at middle part that between central strip and each side slat, are integrally formed into and are arranged on these height with these; Preparation is along the paired top flat and the bottom flat of left and right directions elongation, and preparation respectively has along the connectedness of spaced apart and vertically extending two through holes of fore-and-aft direction, and preparation respectively has along the distance piece in the hole of fore-and-aft direction by wherein,

Make like this tunnel-shaped with each base substrate and become body: left side and the right side opposed end of the central strip of excision base substrate; The left part of each flat part of excision base substrate; The length of the flat left part of excision is greater than the length of the left part of the central strip of excision; Two flats to base substrate partly carry out pressure processing to form heat transfer area increase part; And the left part of the side slat of base substrate curved inwardly to the left or to the right; So that the inner end of side slat leans against respectively on the leading flank of central strip and the trailing flank to form the end bar

The right part that makes every pair of top flat and bottom flat is relatively crooked forming bend, and each flat left part wait to be placed in two through holes of formation in the zone on the front and rear opposite side of central strip,

Make a plurality of sub-assemblies, each sub-assembly comprises that formed paired top flat and bottom flat and the tunnel-shaped that is arranged on therebetween become body, above another, settle sub-assembly abreast for one at certain intervals, between each left part, each connectedness is set so that allow two through holes to be communicated with each through hole of each flat to the adjacent set component, each distance piece is set between the right part of every pair of adjacent set component, and fin is positioned between every pair of connectedness and distance piece between the adjacent set component, and

Every pair of top flat and bottom flat soldering are being become the tunnel-shaped between the flat on side slat, central strip and the end bar of body at this, with the inner end soldering of end bar on central strip, and with the mutual soldering of the bend of every pair of flat together, and further with each flat soldering on the connectedness that is adjacent, distance piece and fin.

10. the method for manufacturing heat exchanger according to claim 9, it is characterized in that, each flat is made by aluminium soldering sheet material, each connectedness, distance piece and passage form base substrate and are made by the aluminium extrudate, fin is made by thin aluminum sheet, and the brazing material that discharges from flat when utilizing fusion carries out soldering.

11. the method for manufacturing heat exchanger according to claim 9 is characterized in that, the left and right sides width of distance piece forms the right part of central strip of base substrate along the cut length of left and right directions greater than passage.

12. the method for manufacturing heat exchanger according to claim 9 is characterized in that, each distance piece has along fore-and-aft direction and extends through wherein hole.

13. the method for manufacturing heat exchanger according to claim 9 is characterized in that, each distance piece has inner peripheral surface, and this inner peripheral surface limiting hole also has the spine and/or the groove of a plurality of longitudinal extensions along the hole.

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