JPH01155196A - Heat exchanger and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent thermal distorsion in using a heat exchanger and facilitate the forming work of bending with a light load, by a method wherein the heat exchanger is constituted of a bent core unit and a bent bracket while the bracket is provided with a plurality of cut slits on the inside and outside surfaces thereof near the central part thereof. CONSTITUTION:The core unit 3 and brackets 41, 42 of a heat exchanger 1 are bent and the bent inside surface A of the bracket is provided with a plurality of slits 45, whose cut-in is small, near the central part thereof while both of the left and right sides thereof are provided with the slits 46, larger than the slits 45. The outside bent surface B is provided with a plurality of slits 47, larger than the slits 45. The heat exchanger 1 is manufactured by a method wherein straight brackets 41, 42, provided with said slits 45-47, are prepared to produce a flat heat exchanger by connecting these brackets 41, 42 to liquid tanks 21, 22, the core unit 3, blades 23, 24 and the like to assemble them, thereafter, the flat heat exchanger is bent by an embossing molding machine. The forming work of bending may be effected easily and quickly with a light load by said manufacturing method and thermal distorsion during using it will never be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to heat exchangers for various internal combustion engines, particularly heat exchangers having curved surfaces for use in motorcycles, and a method for manufacturing the same.

[Prior art]

Conventionally, as a heat exchanger having a curved surface that is said to have a large heat exchange capacity, for example, a heat exchanger disclosed in Japanese Patent Application Laid-Open No. 59-58631 is known. This heat exchanger is a heat exchanger for a motorcycle that includes a core portion that performs heat exchange, and the core portion is curved into a concave shape with respect to the traveling direction of the vehicle.

That is, the heat exchanger has two liquid tanks 91 and 92 standing in parallel on both sides as shown in FIG.

It consists of a core part 93 consisting of a large number of tubes 931 for guiding liquid between these two, fins 932 arranged in a row between the tubes 931, and a bracket 94.94 provided below J- of the core part 93. The nuclear heat exchanger has a curved core portion 93 and bracket throats 94394. In cooling the cooling water of the engine 97 using this heat exchanger.

The cooling water discharged from the cooling water outlet of the engine 97 is
It enters one liquid tank 91 through a pipe 98. Then, it passes through the tube 931 and moves to the liquid tank 92 on the right side. During this time, the cooling water is cooled by heat exchange with the fins 932.

Furthermore, the cooled cooling water passes through a pipe 99.

Enter engine 97.

As described above, in the heat exchanger according to the prior art disclosed in the above-mentioned publication, the core portion is curved in a concave shape with respect to the traveling direction of the vehicle. by the way.

Methods for forming the concave curve can be roughly divided into the following two methods:
There are two possible methods. That is, one method is to manufacture a heat exchanger by assembling members such as tubes, fins, and brackets that have been curved in advance. Also, another one
One method is to fabricate a smooth heat exchanger in advance and then curve it to fabricate the heat exchanger.

[Problems to be solved]

However, the method of assembling the curved members described above requires casting or the like to be used to mold the members themselves, which significantly increases costs and is not suitable for production.

On the other hand, how can a smooth heat exchanger be curved?

In order to bend a relatively rigid bracket, distortion stress and other deformations occur during the bending process. Further, for this reason, this processing method has restrictions or limits on the two radii of curvature, the angle of curvature, and the like. Furthermore, due to residual stress, the curved surface tends to suffer from thermal distortion due to repeated heating and cooling during running.

The present invention was made in view of the problems of the prior art, and eliminates distortion and deformation during field processing.

Another object of the present invention is to provide a heat exchanger that increases the heat radiation area and effect and has a good appearance, and a method for manufacturing the same.

[Means for Solving Problems] The first invention of the present application includes two liquid tanks that are erected in -ζ parallel at a predetermined interval, communicate with the two tanks, and guide the liquid from one tank to the other tank. A heat exchanger comprising a core portion comprising a large number of tubes and fins arranged between the tubes, and brackets provided above and below the core portion.

The heat exchanger is characterized in that the core portion and the bracket are curved, and the bracket has a plurality of slits cut approximately near the center of the curved inner surface thereof, and the curved outer surface thereof also has a plurality of slits cut approximately near the center thereof. A heat exchanger characterized by having a plurality of slits cut in the vicinity of the center.

Therefore, in one aspect of the present invention, the approximately central portion of the bracket refers to the central portion in the longitudinal direction of the bracket;
Specifically, it refers to the central portion that occupies about 1/3 to 1/4 of the total length. Regarding the slits, it is preferable that the plurality of slits near the center of the curved inner surface are small slits with shallow cuts, and large slits with deeper cuts are provided on both sides of the small slits 1. This is because the bracket can be easily curved. On the other hand, the depth of the plurality of slits on the curved outer surface is 1/2 to 1 of the width of the 5brakent.
/4 is preferable. In this case as well, curve forming is easy. However, the state of slit formation due to the above-mentioned combination is as follows.

The most preferred curved heat exchanger is provided.

In addition, the bracket is approximately 2 in the width direction near the center.
It has a division section that is divided into multiple parts such as systems.

Preferably, each divided portion is provided with a plurality of slits. By doing so, it is possible to obtain a heat exchanger in which the bracket is curved more greatly. Also,
The maximum width of the small slit is preferably one-half or less of the maximum width of the large slit, and
Preferably, the radius of curvature is 10 to 30 cm, and the angle of curvature is 15 to 30 degrees.

Also, the width of the slit above is the thickness of the bracket.

For example, a width of about 3 cylinders from a width corresponding to 1.0- is preferable.

Further, it is preferable that the slit width on the curved inner surface is the same as or slightly larger than the slit width on the curved outer surface, and the slits are substantially alternated on the inner surface and the outer surface. Also.

It is preferable that the slit spacing is small approximately at the center of the curved bracket, while the slit spacing is wide on the outer surface. As a result, bending distortion does not occur at the center of the bracket, and cracks due to elongation do not occur on the outer surface, so that the bracket stretches smoothly during bending.

The small slit in the central portion has the effect of suppressing bank ring (rebounding) of the core portion when forming a curve. In addition, the slit interval is 9 curvature radius R
Alternatively, it can be changed as appropriate depending on the magnitude of the curvature angle θ.

Next, as a method for manufacturing the heat exchanger according to the first invention, there is a second invention.

That is, the first and second inventions provide two liquid tanks erected in parallel at a predetermined interval, a number of tubes that communicate with the two tanks and lead the liquid from one tank to the other tank, and between the tubes. A core part consisting of fins arranged in a row,
In the method for manufacturing a heat exchanger comprising brackets provided above and below the core part, and in which the core part and the brackets have a curved shape, two liquid tanks erected in parallel at a predetermined interval; Consisting of a core portion consisting of a number of tubes that communicate with the two tanks and guide the liquid from one tank to the other tank, and fins arranged in a row between the tubes, and brackets provided above and below the core portion. In addition, in the method for manufacturing a heat exchanger in which the core portion and the bracket have a curved shape, the liquid tank, the core portion, and the bracket are assembled in a flat state, and the bracket constitutes an inner side of the curve. A plurality of slits are provided near the center of each inner surface, and a plurality of slits are also provided near the center of the outer surface of the curve, and then the bracket and A method of manufacturing a heat exchanger characterized by press-molding a core portion into a curved shape.

In this manufacturing method, the forming of the slits, the depth 5 width 9 intervals, etc., and the dividing the bracket into a plurality of parts in the width direction near the center thereof are the same as those shown in the first invention. . In addition, the width of the slit differs slightly before and after bending, but it does not change much.For the pressure forming in the single-piece manufacturing method, die pressing or roller pressure forming can be employed.

In addition, each member such as the tank, tubes, fins, and brackets listed in -F is made of aluminum, brass, and copper.

Steel and other materials can be used in the right places. these are,
It does not rust, can be easily curved, and has good heat conduction, increasing the heat dissipation effect.

[Action and effect]

In the heat exchanger according to the present invention, the core portion and the bracket are curved, and the bracket has slits on the inner and outer surfaces, respectively, so that a curved heat exchanger without processing distortion is provided. be able to. That is, the core portion and each member of the bracket are not distorted or deformed during curve molding. Therefore, even when the heat exchanger is used, even if heating and cooling are repeated, thermal distortion does not occur on the curved surfaces or the like. The reason for this is thought to be that the slit absorbs the expansion and contraction of the member and the thermal stress caused by heating disappears. Also, this curved heat exchanger has a large surface area, so
It also has a large heat exchange capacity.

On the other hand, in the method for manufacturing a heat exchanger of the present invention.

After providing slits on the inner and outer surfaces of the bracket, the bracket and the core are pressure-molded. Therefore, the curve forming operation can be performed easily and quickly with a relatively low load. Furthermore, since the slit absorbs strain stress and residual stress, no strain deformation occurs in the bracket during curve forming. Also.

Since the bracket is provided with slits, the radius of curvature can be made smaller than in conventional heat exchangers, and the angle of curvature can be made larger.

〔Example〕

First Embodiment A heat exchanger according to this embodiment will be explained with reference to FIGS. 1 to 3.

As shown in FIGS. 1 and 2, the heat exchanger 1 according to the present example includes two liquid tanks 21 and 22 erected on both sides, a core part 3 in the center thereof, and a core part 3 above and below the core part 3. It consists of provided brackets 41, 42. Further, the core portion 3 is made up of a number of tubes 5 that communicate with the two tanks 21 and 22 and guide the liquid from one tank to the other tank, and fins 6 arranged between the tubes 5.

The heat exchanger 1 is as shown in FIG.

The core portion 3 and the bracket 41, 42 are curved, and the bracket 3 has a plurality of small slits 4 near the center thereof on the curved inner surface thereof.
5. Furthermore, it has slits 46 larger than the small slit 45 on both its left and right sides. Also on the curved outer surface B.

It has a plurality of slits 47 larger than the slits 45 on the inner surface A. The size of each of the slits will be described later in the manufacturing method.

The brackets 41 and 42 are the tubes 5 and fins 6.
It is attached to the top and bottom of the core part 3 consisting of. In other words, it serves as a formwork for fixing and protecting the position of the core portion 3.

As shown in FIG. 1, the bracket is made of an aluminum plate having a constant width.

Further, the tube 5 shown in -h is made of aluminum, and the fin 6 is made of aluminum. These materials are relatively soft, easy to curve and form, and are optimal for rust prevention.

It also has good heat conduction and excellent heat dissipation effects.

In addition, in the same figure, the symbols 23 and 24 are plates 48
is a fixture.

Next, a method of manufacturing the heat exchanger I will be explained.

First, the bracket 4L42 provided with the slits 45, 46, and 47 as described above (however, it is straight) is ttt
+i, and add this to the liquid tanks 21, 22° core part 3. The joint 1 was assembled together with plates 23, 24, etc. by a conventional method to produce a flat heat exchanger. That is, this device is similar to the heat exchanger 1 shown in FIGS. 1 and 2,
The difference is that it is not curved.

The plate width t of the brackets 41 and 42 is 1.6 m,
The depth of the slit is 2.5 mm for the small slit 45,
The slits 46 on both sides were 8M, and the slits 47 on the curved outer surface were 8m+a, half the width of the bracket. Also,
The width of the slit was thus 2III11.

As shown in FIG. 3, the flat heat exchanger described in (h) was molded into a curved shape using a molding machine.

That is, the above-described flat heat exchanger is placed on F of a lower mold 80 having a cavity 801 on the upper part, and the mold surface 811 is inserted from above.
The heat exchanger was pressurized by a punch 81 having a diameter. At this time, embossing press molding was performed with the curved inner surfaces A of the brackets 41 (, 42) and the core portion 3 facing the punch 81 side, and the lower portions of the curved outer surfaces B facing the lower die 80 side. The cavity 801 and the mold surface 811 of the punch have substantially the same radius of curvature. This radius of curvature was slightly larger than the radius of curvature of the heat exchanger 1 to be manufactured, and the molding pressure in this case was about 2 kg/cJ, which was about 70% of the molding pressure when the bracket was not provided with slits.

The radius of curvature R of the curved surface in the thus obtained heat exchanger l was 15 cm, and the bending angle θ was 25''. Although the overall width on the front side, that is, the curved inner surface, is relatively narrow (310 mm), the surface area of the core part 3 is approximately 13% larger than that of a smooth heat exchanger, and the heat dissipation is proportional to this. The area and heat dissipation effect also increased by over 13%.

As described above, according to the manufacturing method of the two examples, the curve forming operation requires relatively low load, and the curve can be formed easily and quickly. Moreover, of course the above brackets 41 and 42,
The tubes 5 and fins 6 of the core portion 3 were also free from deformation due to strain stress or residual stress.

Second Embodiment The heat exchanger 31 and its manufacturing method according to this embodiment will be explained with reference to FIGS. 4 to 6.

The heat exchanger of this example is the same as the heat exchanger shown in the first example, except that the bracket 41 is divided into two parts in the width direction near the center thereof, and a long hole part 7 is formed between them. Bracket division parts 411 and 412 are formed on both sides. The bracket 42 below the heat exchanger is also configured in the same manner. The divided portions 411 and 412 each have a plurality of slits at the top and bottom. That is, first, minute 'A11 part 4
11 has a small diameter on its curved inner surface A side as in the first embodiment.

It has a diameter of 45.46 mm (large sulin) and is on the elongated hole 7 side.

The slit 77 has a depth approximately half the width of the dividing portion 411. Also, on the curved inner surface of the first divided portion 412 side, there is a small slit 45°46 similar to the slit 45°46 on the inner surface of the divided portion 411.
It has a large slin door 5.76, and a slit 47 similar to the slit 77 described above on the curved outer surface B side.

Further, the core portion 3 includes a large number of tubes 5 and fins 6 arranged regularly between the tubes at predetermined intervals.

In the upper part of the heat exchanger, as shown in FIG. It is set up as a frame. On the other hand, the fins in the lowest row of the fins 6 are constructed in the same manner (however, 9 is not shown).

Further, the bracket was an aluminum plate having a thickness of about 1.6 mm, and the material of the tube 5 and fin 6 was also aluminum. The rest was the same as in the first embodiment.

Moreover, in the manufacturing method of the heat exchanger 1 of 9th example.

Except that a roll pressure forming method was used to form the curve.

The manufacturing method was the same as that of the first embodiment. This roll pressure forming method involves arranging two rolls 85, 85 of two equal diameters at appropriate positions as shown in FIG.

A flat heat exchanger is placed on top of the heat exchanger, and the bracket and core portion are bent while being held down by the upper roll 86.

According to this example, since the divided portions 411 and 412 are provided at approximately the center position of the brackets 41 and 42, the curve forming was even easier than in the case of the first example. In addition, other effects similar to those of the first embodiment were obtained.

Third Embodiment A heat exchanger 1 according to this embodiment is constructed by dividing the bracket of the first embodiment into three parts near the center, as shown in FIGS. 7 and 8. That is, as shown in FIG. 7, 0-divided portions 411 and 412 are provided near the center of the bracket 41 in accordance with the second embodiment, and a divided portion 413 is further provided therebetween. Between these.

It has long hole portions 71 and 72. This means that bracket 42
The same goes for the sides.

Moreover, the slits provided in these divided portions 411 to 413 all had the same depth. This depth is approximately 1 width of each division.
/3. Further, above the core part 3, as shown in FIG. 8, the uppermost fin 61 is arranged below the divided parts 411, 412, 413 of the bracket, and the uppermost tube 51 is arranged below it. .

The other configurations were the same as those of the first embodiment.

Moreover, the curve formation at the time of manufacture was performed by roll forming, as in the second embodiment.

According to this example, three divided portions 411 to 413 are provided near the center of the bracket 41, 42, so curve forming is even easier than in the first and second examples. Met. Also.

This example is a method that is even more effective when the bracket is made of a hard material. Other effects similar to those of the first embodiment can be obtained.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a plan view of the heat exchanger, and FIG. 2 is a front view thereof. FIG. 3 is a side view of the heat exchanger during molding, FIGS. 4 to 6 show the second embodiment, FIG. 4 is a plan view of the heat exchanger, FIG. 5 is a partial front view of the core, and FIG. The figure is a side view of the molding process.
7 and 8 show the heat exchanger of the third embodiment,
The figure is a plan view, Figure 8 is a partial front view of the core, and Figure 9 is a partial front view of the core.
The figure is a perspective view of a conventional heat exchanger. 109. Heat exchanger. 21.22. ,,tank. 321. Core part. 41.42. ,, Bracket. 411.412,413. ,,divided part. 45.46.47. ,,slit. 510. Tube 5 691. fin. 7.71,72. ,, Long hole part. 75.76.77.7B,,, Slit.

Claims (14)

[Claims] (1) Two liquid tanks erected in parallel at a predetermined interval, a number of tubes that communicate with the two tanks and lead the liquid from one tank to the other tank, and a number of tubes installed in a row between the tubes. A heat exchanger consisting of a core portion consisting of fins and brackets provided above and below the core portion, the core portion and the brackets being curved, and the brackets being curved on the inner surface of the curve. A heat exchanger characterized in that it has a plurality of slits cut in the vicinity of its center, and also has a plurality of slits cut in its curved outer surface near its center. (2) In multiple slits on the curved inner surface,
2. The heat exchanger according to claim 1, wherein the slit near the center is a small slit with a shallow cut, and the slits on both sides are large slits with a deep cut. (3) The depth of the multiple slits on the curved outer surface is
The heat exchanger according to claim 1, wherein the width is 1/3 to 1/2 of the width of the bracket. (4) The scope of the claim characterized in that the bracket has a divided portion that is divided into a plurality of parts in the width direction near the center thereof, and each divided part has a plurality of slits. The heat exchanger according to paragraph 1. (5) The heat exchanger according to claim 2, wherein the maximum depth of the small slit is one-half or less of the maximum depth of the large slit. (6) The heat exchanger according to claim 1, wherein the curve has a radius of curvature R of 10 to 30 cm. (7) The heat exchanger according to claim 1, wherein the curve is such that the curve angle θ is 15 to 30 degrees. (8) Two liquid tanks erected in parallel at a predetermined interval, a number of tubes that communicate with the two tanks and lead the liquid from one tank to the other tank, and fins arranged in a row between the tubes. In the method for manufacturing a heat exchanger, the heat exchanger is composed of a core part consisting of a core part, and brackets provided above and below the core part, and the core part and the brackets have a curved shape, wherein the liquid tank, the core part and the brackets The bracket is assembled in a flat state, and in the above bracket, multiple slits are provided near the center of the inner surface that forms the inside of the curve, and the outer surface that forms the outside of the curve is provided. A method of manufacturing a heat exchanger, characterized in that a plurality of slits are provided near the center of the bracket, and then the bracket and the core are press-formed into a curved shape. (9) Claim 8, characterized in that among the plurality of slits on the curved inner surface, the slit near the center is a small slit with a shallow cut, and the slits on both sides are large slits with a deep cut.
The method for manufacturing the heat exchanger described in Section 1. (10) The method of manufacturing a heat exchanger according to claim 8, wherein the depth of the plurality of slits on the curved outer surface is 1/3 to 1/2 of the width of the bracket. (11) The method for manufacturing a heat exchanger according to claim 8, wherein the pressure molding is die-press molding. (12) The method for manufacturing a heat exchanger according to claim 8, wherein the pressure forming is roll pressure forming. (13) According to claim 8, the bracket has a plurality of divided parts that are divided into a plurality of parts at predetermined intervals near the center thereof, and each divided part has a plurality of slits cut into each part. A method of manufacturing a heat exchanger. (14) The method for manufacturing a heat exchanger according to claim 9, wherein the maximum depth of the small slit is one-half or less of the maximum depth of the large slit.