JPH03129299A - Pin fin member - Google Patents

Abstract

PURPOSE:To perform easy and high-precise manufacture of a heat exchanger with a pin fin having high heat transfer efficiency by a method wherein a linear heat conductor is bent in a corrugated state, and one curved top part is secured to a metallic sheet. CONSTITUTION:A plurality of linear heat conductors 3 are arranged with a distance between the adjoining heat conductors, a sheet formed of the linear heat conductors 3 and a temporary fixing material is formed, and a plurality of the linear heat conductors are fixed in an alignment state. The sheet is process in a corrugated state, the one curved top part 4 of the corrugated sheet is joined to a metallic sheet 2, and the temporary fixing material is removed. Namely, in a pin fin member 1, the linear heat conductor 3 curved in a corrugated state in the direction of length are arranged throughout the approximate whole area of a surface 2a of the metallic sheet 2, and the curved top part 4 on the one side of the linear heat conductor 3 is secured on the surface 2a of the metallic sheet 2. This constitution enables easy and high-precis manufacture of a heat exchanger with a pin fin.

Description

[Detailed description of the invention] 3 industrial application fields] The present invention relates to a pin fin member for a heat exchanger.

More specifically, the present invention relates to a pin fin member that is useful for easily and accurately manufacturing a pin fin heat exchanger with good heat transfer efficiency.

[Prior art and problems to be solved by the invention] In a heat exchanger, in order to improve the heat exchange performance between the fluid inside the pipe and the fluid outside the pipe, fins are usually attached to the outer periphery of the vibrator through which the fluid inside the pipe flows. . The fins are usually plate-shaped and are formed in a spiral or annular shape around the vibrator. In the case of such plate-shaped fins, a boundary layer of air is generated on the surface of the plate, and this boundary layer stays on the surface of the plate to form a heat insulating layer, so that high thermal efficiency cannot be obtained. From this point of view, pin-shaped fins are preferable. Furthermore, heat exchange efficiency can be improved by increasing the attachment density of the bottle-shaped fins to the vibrator surface.

However, the actual work of arranging the bottle-shaped fins around the outer circumference of the vibrator is extremely difficult, and when trying to arrange the pins closely to increase heat exchange efficiency, it is difficult to arrange the pins in a way that corresponds to the wire diameter of the pins. It is necessary to correctly arrange the bin-shaped fins at a density determined by the method, and this task becomes increasingly difficult.

Therefore, many attempts have been made to provide a heat exchanger with excellent bottle-shaped fins using many complex machines, but the present situation is that it has not yet been commercially put to practical use.

The present invention solves the problems of conventionally known heat exchangers and provides a pin fin member for a heat exchanger that is useful for easily and accurately manufacturing a heat exchanger with pin fins having good heat transfer efficiency. With the goal.

[Means to solve the problem]

An object of the present invention is to provide a heat exchanger member in which fins are arranged on a metal plate, the fins being composed of a plurality of linear heat conductors arranged in parallel with each other at intervals, and in which the linear heat conductors is achieved by a pin fin member which is curved in a corrugated manner in the length direction, and one curved apex is fixed to the metal plate.

A preferred method for manufacturing the pin fin member of the present invention includes the step of arranging a plurality of linear thermal conductors in parallel and spaced apart from each other, forming a sheet made of the linear thermal conductors and a temporary fixing material, and From the step of fixing the linear thermal conductors in an arrayed state, the step of processing the sheet into a corrugated shape, the step of joining one curved top of the corrugated sheet to a metal plate, and the step of removing the temporary fixing material. Become.

The present invention will be described in detail below with reference to the accompanying drawings showing preferred embodiments of the pin fin member of the present invention.

In the pin fin member 1 according to the embodiment of the present invention shown in FIG. A curved top portion 4 on one side of the metal plate 3 is fixed to the surface 2a of the metal plate 2.

As the metal plate, a pure metal or an alloy such as silver, copper, or aluminum, or a metal obtained by subjecting the metal plate to solder plating, tin plating, etc. can be used.

The surface condition and thickness of the metal plate are not particularly limited, but when used as a pin fin member for a heat exchanger, the surface condition may be uneven to improve heat exchange performance, but the curved top of the linear heat conductor 3 It is preferable that the surface to which 4 is fixed is smooth and has a thickness of 10 to 500 mm.

The thermal conductivity of the metal plate is 0.038ca12/e++
rsec·t: The above is preferable, and depending on the application, a metal plate having a more appropriate thermal conductivity can be selected and used.

There is no particular limitation on the cross-sectional shape of the linear heat conductor, but in order to reduce pressure loss when used as a pin fin member for a heat exchanger, it is preferable to use a linear heat conductor with a nearly circular cross section.

The thermal conductivity of the linear thermal conductor is 0.038caβ/as-s
The temperature is preferably ea·° C. or higher, and depending on the application, a linear thermal conductor having a more appropriate thermal conductivity can be selected and used.

Various surface treatments such as hydrophilic treatment, antirust treatment, and ceramic coating can be applied to the linear heat conductor at any step during the manufacture of the pin fin member, if necessary.

A feature of the pin fin member of the present invention as described above is that the fins are composed of a plurality of linear heat conductors arranged in parallel with each other at intervals, and the linear heat conductors are curved in a corrugate shape in the longitudinal direction. , at the point where the curved top on one side is fixed to the metal plate.

In order to obtain a heat exchanger with low pressure loss and high heat exchange efficiency using the pin fin member for a heat exchanger of the present invention,
It is preferable that the size of the linear thermal conductor and the arrangement density of the plurality of corrugated linear thermal conductors are set so as to satisfy the following formula.

0.25≦X≦2.5 0.5≦XY≦2.5 In the above formula, X is the outer circumference length of the cross section of the linear thermal conductor (mm
), and Y is the arrangement density (book/crap) of linear thermal conductors.

FIG. 3 shows an example of a corrugated sheet (details will be described later) used to manufacture the pin fin member of the present invention. As shown in FIG. 3, five linear thermal conductors 3a, 3b
, 3c, 3d and 3e form a corrugated sheet 19a.
are arranged in Five linear thermal conductors 3a, 3b, 3
c, 3d, and 3e are embedded in a temporary fixing material, for example, a plastic sheet 5, at intervals from each other.

As shown in FIG. 3, the interval between two adjacent linear thermal conductors is defined as 22. Each linear heat conductor is curved in a corrugated manner, and the distance between the center of the curved apex 4 of one linear heat conductor and the center of the adjacent curved apex 4 of the same linear heat conductor, in other words Then, referring to FIG. 3, the distance between two adjacent parallel portions of one linear thermal conductor 3a is defined as Zl.

From the value of Z1, calculate the arrangement density Y+ of the linear thermal conductors in the longitudinal direction of the linear thermal conductors7, and on the other hand, calculate the arrangement density Y+ of the linear thermal conductors in the longitudinal direction of the linear thermal conductors. Density Y2 is calculated from the value of Z2. Y used in the above formula is Y+
The average value of and Y2 is used. In addition, Yl is 0.2 pieces/additionally
Preferably, the range is 10 pieces/unit, and Y2 is in the range of 0.2 pieces/city to 10 pieces/place.

If X<0.25, the wire diameter of the linear heat conductor is too small and its mechanical properties are too low, resulting in poor handling during manufacturing of the pin fin heat exchanger and poor production efficiency. decreases.

When X > 2.5, the wire diameter of the linear heat conductor tends to be too large, making it difficult to exhibit its performance as a bottle-shaped fin.

When XY<0.5, the surface area of the linear heat conductor for bottle fins becomes small, making it difficult to obtain a high heat exchange coefficient.

When X Y > 2.5, a linear heat conductor with a large surface area can be used, but the spacing between the fins becomes too narrow and the pressure loss of the heat exchange fluid tends to increase.

Next, an example of a method for manufacturing a bottle fin member according to the present invention will be explained.

FIG. 2 shows an example of an apparatus for making a sheet made of a plurality of linear thermal conductors and temporary fixing material.

As shown in FIG. 2, a plurality of linear heat conductors 3 are wound up into a package shape (not shown) and set in a required number on a creel 6, and then a pair of heating press rolls 7, which will be described later, are mounted on a creel 6.
．． 7'.

At this time, the plurality of linear thermal conductors 3 are pulled out through the batten 8, the preliquid 9, and the tension bar 10, so that the tension is made uniform, and then the grooved guide rollers 11 and the alignment layer 12 are pulled out. and are aligned at substantially equal pitches in the -plane.

On the other hand, the sheet 5 made of soluble resin is pulled out from the sheet roll 5', passes through a guide roll 13.14, and passes through a pair of heated press rolls 7.7 together with the group of linear thermal conductors 3.
' is guided by. The group of linear thermal conductors 3 and the soluble resin sheet 5 are heated and pressed on the heating-fless roll 7.7',
A state in which the linear thermal conductor 3 is embedded in the sheet 5 is integrated.

In addition to the method shown in FIG. 2, the linear thermal conductors 30 and the soluble resin sheet 5 are integrated by a method of heating and pressing the soluble resin sheet 5 from both sides of the linear thermal conductors 30. Good too.

In this case, the state in which the linear thermal conductor 3 is embedded in the soluble resin sheet 5 is that it is completely embedded in the soluble resin sheet 5, or that the linear thermal conductor 3 is embedded on the soluble resin sheet 5, for example. You may embed part of it.

Although the degree of embedding also affects the thickness of the soluble resin sheet 5, it is preferable that the degree of embedding is 10% or more, preferably 30% or more of the linear thermal conductor 3.

The composite sheet 15 that has passed through the heated press rolls 7, 7' and is unified passes through a pair of delivery rollers 16 and 16', and then is wound up by a winding roll 17.

As the temporary fixing material for fixing the linear thermal conductor, a material that can be melted, decomposed, or burned out by heat, chemicals, etc. can be used. For example, a cellulose-based, polyvinyl alcohol-based, polyester-based, or polystyrene-based delicate cellulose derivative, or a sheet made of such a derivative and a cellulose pipe, etc. can be used. Alternatively, for example, a mixed sheet of carboxymethyl cellulose and cellulose parboil may be coated or laminated with polyvinyl alcohol, or various sheets may be combined as appropriate. However, paper made of cellulose pulp is preferred because of its ease of handling.

Although the width and thickness of the sheet may be selected as appropriate, for example, a sheet having a width of 0.5 to 1.5 m and a thickness of 10 to 200 m is preferable for handling purposes.

Further, as a method for fixing a plurality of linear thermal conductors 3 to a sheet, they may be embedded in the sheet, or an adhesive layer that can be decomposed, burned out, or dissolved by heat or chemicals is applied onto the sheet. As the adhesive, for example, polyvinyl alcohol, polyester, ethylene, vinyl acetate, protein, cellulose derivatives, etc. can be used.

As a method of molding the linear heat conductors 3 fixed in parallel at intervals into a corrugated state, a corrugate molding machine that molds plate-shaped corrugate fins of a conventionally known corrugated heat exchanger, such as a pair of corrugated molding machines, is used. A method of compression molding 30 groups of linear thermal conductors fixed in parallel by a press into a corrugated shape or a commercially available pleating machine may be applied. In particular, when the wire diameter of the linear thermal conductor is as small as 200 mm, an accordion-type pleating machine is fully applicable.

A plurality of linear thermal conductors 19a (
A corrugated composite seam (hereinafter referred to as 19a) is shown in FIG. Note that the arrangement pitch of the parallel portions (5a, 5b, or 3a to 3e in FIG. 3) of the linear heat conductor 3 after corrugation processing does not necessarily have to be at equal intervals, and may be arbitrarily set depending on the purpose.

For example, the pin fin member 1 shown in FIG. 1 is made from the corrugated composite sheet 19a.

When making the pin fin IH shown in FIG. 1, the corrugated composite sheet 19a is adjusted to the metal plate size as shown in FIG.
, cut in a direction perpendicular to the longitudinal direction, that is, along the line 22 in FIG. 4 to produce a corrugated pin fin unit 20 (FIG. 5) having a length G and a width W shown in FIG. It is obtained by joining the pin fin unit 20 to the metal plate 2.

If necessary, the corrugated composite sheet 19a may be joined to the metal plate 2 and then cut into a predetermined size.

A temporary fixing material that covers the curved top of the linear thermal conductor in order to expose the surface of the linear thermal conductor before joining the corrugated composite sheet 19a or the corrugated pin fin unit 20 to the surface 2a of the metal plate 2; That is, in this case, it is necessary to remove the soluble resin. Figure 6 shows linear thermal conductor 3
The soluble resin 5 covering one curved top part 4 is removed by Δh1 to form a laryllel corrugated pin fin unit 21 used to make the pin fin member 1 shown in FIG.
I'll show you. The value of Δh may be between 0 and 1 fight.

This resin removal process is performed before or after cutting the corrugated composite sheet 22a.

Next, the process of joining the corrugated pin fin unit 21 to the metal plate 2 will be explained.

The joining process when manufacturing the pin fin member 1 shown in FIG. 1 will be explained. As shown in FIG. 7, a brazing filler metal 22 is applied to the surface 2a of the metal plate 2 in order to make a metal plate 23 with a brazing filler metal. Alternatively, a brazing filler metal may be applied to the front and back surfaces of the metal plate 2 depending on the purpose. The brazing material can be applied by known means such as coating, dipping the metal plate 2 into the brazing material a, or cloud brazing.

The brazing filler metal 22 differs depending on the materials of the metal plate 2 and the linear heat conductor 3. For example, when copper is used, solder containing lead as a main component is preferable, and may be selected as appropriate depending on the materials used. A resin with good thermal conductivity may be used. Also, the brazing material is applied using a corrugated pin fin unit 21.
It may be applied to both the top B4, the metal plate 2, and the corrugated fin unit 21.

Corrugated fin unit 2 obtained in this way
1 and a brazing metal plate 23 are stacked as shown in FIG. 8, and fixed under a pressure of, for example, 2 kg/cnf to obtain a laminate 24. For example, the temperature of the laminate 24 is 165°C.
The process is performed in a furnace for 30 minutes, for example, to obtain an integrated metal plate fin 25 in which the curved top portion 4 of the linear heat conductor is reliably joined to the surface of the metal plate 230.

The pressing force when making the laminate 24 varies depending on the manufacturing conditions of the corrugated fin unit 21, such as the diameter and pitch of the linear heat conductor 3, the sheet thickness and type of the soluble resin 5, etc. The setting may be made such that the corrugated fin unit 21 does not buckle and the metal plate 23 and the curved exposed portion 4 of the linear heat conductor of the corrugated fin unit 21 are reliably joined. In the metal plate/fin integrated body 25 made in this way, the soluble resin 5 still remains between the linear thermal conductors 3, so for example, as shown in FIG. 9, the metal plate/fin integrated body 25 is For example, 10
Pour hot water 27 at 0°C. The soluble sealant 5 is removed by hot water treatment for about 60 minutes, and a pin fin member 1 as shown in FIG. 1 is obtained.

An example of manufacturing a heat exchanger using the pin fin member 1 obtained in this manner will be described.

The heat exchanger 28 illustrated in FIG. 10 is obtained by spirally winding and joining the pin fin member 1 around the outer periphery of a cylindrical vibrator 29 for internal fluid.

The heat exchanger 30 illustrated in FIG. 11 is obtained by joining a pin fin member 1 between flat vibrators 31 for fluid in the tubes.

Note that the bonding material may be a brazing filler metal or a resin with good thermal conductivity.

Figure 12 is an example of a cross-sectional view of one component of a heat exchanger. For example, the pin fin member 1 is bonded to a portion that greatly contributes to heat exchange performance using a brazing material or the like.

The heat exchanger is completed by attaching an inlet for receiving fluid in the tubes to one end of the pipes of the heat exchangers 28 and 29, and attaching an outlet for fluid in the tubes to the other end of the pipe.

〔Example〕

Hereinafter, the pin fin member according to the present invention will be explained in further detail by giving examples.

A bottle fin unit 21 in which the resin on the curved top portion 4 was removed after corrugating a sheet made of the linear thermal conductor 3 and soluble resin using a device similar to the device shown in FIG.
Make it.

The manufacturing conditions at that time are shown below.

Linear thermal conductor cross-sectional shape circular diameter 200. l/mφ material
Quality Copper creel number 500 Yarn feeding method Bobbin rotation weft removal feed roll circumferential speed 1 m/min Layer used 25.4 feathers/1 nch (therefore, reed pitch 1++a+) PVA film thickness 200 pitches (manufactured by Soko Seiren Co., Ltd.) Soluble resin sheet Heating press conditions Temperature: 200℃ Load: 20k
g Corrugate forming machine Accordion pleat machine manufactured by Toyo Koki Co., Ltd. Corrugate forming conditions h = 13 mm Copper plate (thickness + 0.1 mm, width: 12 mm) on metal plate 23.
3 m + n, length: 250 mm) and the pin fin unit (W = 12 mm, G = 245 mm) shown in Figure 6 were placed on a copper plate using a jig similar to the jig shown in Figure 8, and placed inside the furnace. Braze with. Thereafter, the remaining soluble resin 5 in the copper plate fin integral body was removed to produce a pin fin member.

In the pin fin member manufactured under the above conditions, the outer circumferential length X of the linear thermal conductor 3 in the present invention is 0.628, and the arrangement density Y of the fin forest portion of the linear thermal conductor 3 is 1/mm. .

The pin fin member is connected to a flat pipe for internal fluid (short diameter;
5mm, major axis 12.7mm, wall thickness 0.65a+m) and brazed in a furnace to make a heat exchanger as shown in Fig. 11.The performance of the heat exchanger was investigated, and it was found that it had excellent heat exchange performance. Indicated.

〔Effect of the invention〕

Since the pin fin member according to the present invention is configured as described above, when used as a bin fin of a heat exchanger with pin fins, the wire diameter and arrangement density for obtaining the desired heat conduction efficiency can be easily and precisely achieved. At the same time, the heat exchanger can be attached to the internal fluid pipe as an integrated unit of multiple linear heat conductors and metal plates, making it possible to manufacture a heat exchanger with excellent performance as described above. It can be easily done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a pin fin member according to the present invention, and FIG. Figure 3 shows a corrugated wire used for the pin fin member of the present invention)
FIG. 4 is a perspective view showing an example of a corrugated composite sheet used for making the bin fin member of the present invention, and FIG. FIG. 2 is a perspective view showing a corrugated bottle fin unit cut out from a corrugated composite sheet;
Fig. 6 is a front view showing one piece of the corrugated bottle fin unit from which the temporary fixing material at the curved top of the corrugated composite sheet has been removed, and Fig. 7 is a perspective view illustrating the application of solder to the surface of the metal plate. FIG. 8 is a front view showing an example of an integrated metal plate fin in the pin fin member of the present invention, and FIG. 9 is a perspective view illustrating a method for removing the temporary fixing material from the integrated metal plate fin. 10 to 12 are a perspective view and a sectional view, respectively, showing an example of a heat exchanger using the pin fin member of the present invention. DESCRIPTION OF SYMBOLS 1... Pin fin member (present invention), 2... Metal plate, 3... Linear thermal conductor, 4...
...Curved top, 5...Soluble resin, 15...
Composite sheet, 19a... Corrugated composite sheet, 20... Corrugated bottle fin unit, 22...
・Brazing metal, 25...Metal plate fin integrated piece, 2
8, 30...heat exchanger.

Claims (1)

[Claims] A heat exchanger member in which fins are arranged on a metal plate, and consists of a plurality of linear heat conductors in which the fins are arranged parallel to each other at intervals, and the linear heat conductors are corrugated in the longitudinal direction. A pin fin member that is curved in a shape and has one curved top portion fixed to the metal plate.