JPH03181794A - Corrugated pin fin member - Google Patents

Abstract

PURPOSE:To provide a heat exchanging pin fin member showing a better heat transfer efficiency by a method wherein a fixing member to be arranged at a corrugated bent top part is made of material which is solid at its normal temperature, melted under a heating operation and becomes a melting and fixing material. CONSTITUTION:As a linear thermal conductor of a corrugated pin fin member, a pure metallic fine wire of silver, copper and aluminum or the like or an alloy fine wire or a solder plated and a tin plated metallic fine wire can be used. As a fixing member, member made of alloy such as brazing, soldering or the like is used. A corrugated pin fin member 1a is cut to a size of each of inside fluid pipes 30 and 30' of a heat exchanger so as to get a corrugated pin fin member 29a. Then, the pin fin member 29a is held between the inside fluid pipes 30 and 30', and then a corrugated bent top part 4 and the surfaces of the inside fluid pipes 30 and 30' are soldered or brazed. As a result, it is possible to accomplish a wire diameter and a density of arrangement capable of getting a desired heat exchanging efficiency easily and in a high accurate manner.

Description

[Detailed description of the invention] [Industrial application field] 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, fins are usually attached to the outer periphery of the pipe through which the fluid flows in order to improve the heat exchange performance between the fluid inside the pipe and the fluid outside the pipe. . The fins are usually plate-shaped and are formed in a spiral or annular shape around the pipe. 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, bottle-shaped fins are preferable. Heat exchange efficiency can be improved by increasing the attachment density of spin-like fins to the pipe surface.

However, the actual work of arranging bottle-shaped fins around the outer circumference of the pipe is extremely difficult, and when trying to arrange the bottles closely to increase heat exchange efficiency, it is difficult to arrange the bottle-shaped fins around the outer circumference of the pipe. 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 pin fin heat exchanger with good heat transfer efficiency. With the goal.

[Means to solve the problem]

An object of the present invention is to include a plurality of linear heat conductors arranged in parallel and at predetermined intervals, and a fixing member arranged perpendicularly to the linear heat conductors, It is formed into a corrugated I-shape in the direction of the linear heat conductor, and the fixing member is arranged at least at the curved top of the corrugate shape, and the fixing member arranged at the curved top is solid at room temperature. This is achieved by a corrugated pin fin member characterized in that it is made of a material that melts when heated and becomes a welding material.

A preferred method for manufacturing the pin fin member of the present invention is to arrange a plurality of linear heat conductors in parallel and spaced apart from each other, and to cross the linear heat conductors with a fixing member to form a plurality of linear heat conductors. The method consists of a step of fixing the bodies in an arrayed state, and a step of processing the linear heat conductors into a corrugated shape.

The pin fin member may be composed of only a plurality of linear heat conductors arranged in parallel and at predetermined intervals and a plurality of fixing members located at the top of the curve after corrugating, or the linear heat conductor In addition to the body and the fixing member, other fixing members, such as organic threads, may be used to form a fabric-like integral body. The corrugated pin fin member of the present invention also includes cases where these other threads are used.

Such a corrugated fin member of the present invention is placed, for example, between two adjacent pipes for fluid in the pipe so that the corrugated curved top of the linear heat conductor of the pin fin member abuts against the pipe for fluid in the pipe. A heat exchanger with pin fins can be obtained by arranging the pin fins and fixing them to the internal fluid pipes at the contact points.

As the linear thermal conductor used in the corrugated pin fin member of the present invention, a thin pure metal wire or an alloy thin wire of silver, copper, aluminum, etc., or a thin metal wire obtained by subjecting the thin metal wire to solder plating, tin plating, etc. can be 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 a linear thermal conductor is 0.038 cai! / cm
/see/°C or more is preferable, and depending on the application, a linear thermal conductor having a more appropriate thermal conductivity can be selected and used.

The fixing member used in the corrugated pin fin member of the present invention is a material that is solid at room temperature and becomes a welding material when melted by heating, such as an alloy such as a brazing material or a solder material, such as AlSi, AN-Si- Mg, Pb
A member made of Sn-based alloy or the like can be used.

Further, as the organic thread, threads made of thermoplastic resin or thermosetting resin that can be burned out, dissolved, or decomposed by heat, chemicals, etc. can be used.

The cross-sectional shape of the fixing member is not particularly limited, but can be appropriately selected and used in consideration of ease of manufacturing the pin fin member, heat exchange performance, etc.

The intersecting state of the fixing member is usually perpendicular to the longitudinal direction of the linear thermal conductor of the present invention, but it may be oblique or meandering.

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

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

An example of a corrugated pin fin member according to the present invention is shown as a model in FIG. 1(A) and FIG. 1(B).

Corrugated pin fin member 1 illustrated in FIG. 1(A)
In d, a plurality of linear thermal conductors 3 are arranged at predetermined intervals and are formed into a corrugate shape, and the fixing member 2a is located at the curved top 4 of the corrugate.

Corrugated pin fin member 1 illustrated in FIG. 1(B)
In b, a fixing member 2C for fixing a plurality of linear heat conductors 3 is also arranged at a position other than the curved top 4 of the corrugate. The arrangement of the fixing member at the curved top 4 is shown in FIG. 1(A).
As shown at 23 in FIG. 1 (B
) may be inside the curved top portion 4 as shown by 2b.

In order to obtain a heat exchanger with low pressure loss and high heat exchange efficiency using the corrugated pin fin member material of the present invention, the size of the linear thermal conductor and the arrangement density of the plurality of corrugated linear thermal conductors are important. It is preferable to set it so that it satisfies 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 (lines/mm) of linear thermal conductors.

In the corrugated pin fin member shown in FIG. 1(A),
Five linear thermal conductors 3a, 3b, 3c.

3d and 3e are arranged in a corrugated manner.

Five linear thermal conductors 3a, 3b, 3c, 3d and 3e
are spaced apart from each other, and the fixing member, for example, the solder material 2a
is buried inside. As shown in FIG. 1(A), 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 if,
In FIG. 1(A), the distance between two adjacent parallel portions of one linear thermal conductor 3a is defined as Zl.

Calculate the arrangement density Y1 of the linear thermal conductors in the longitudinal direction of the linear thermal conductors from the value of Z1, and calculate the arrangement density Y1 of the linear thermal conductors in the direction perpendicular to the longitudinal direction of the linear thermal conductors. Y2 is calculated from the value of Z2. For Y used in the above formula, the average value of Yl and Y2 is used. In addition, Y1 is 0.2 lines/mm ~ 10
Lines/mm, Y2 is 0.2 lines/mm to 10 lines/m
A range of m is preferred.

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 thermal conductor tends to be too large, making it difficult to exhibit its performance as a pin-shaped fin.

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

When XY>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 corrugated pin fin member according to the present invention will be explained.

FIG. 2 illustrates an apparatus for making a composite sheet consisting of a plurality of linear heat conductors and fixing members.

As shown in FIG. 2, a plurality of linear thermal conductors 3 are wound up into a package shape (not shown) and set in the required number on a creel 5, and are moved by a pair of pick-up rolls 6 and 6', which will be described later. be drawn out. At this time, the plurality of linear thermal conductors 3 are pulled out through the batten 7, the front stream 8, and the tension bar 9, so that the tension is made uniform, and then the grooved guide rollers 10 and the array reeds 11 are After that, -
They are arranged at substantially equal pitches in a plane.

In the apparatus shown in FIG. 2, a transfer method using a sheet is used to arrange the fixing member 2 on a plurality of linear heat conductors. That is, the sheet 13 is pulled out from the sheet roll 13', passes through the guide roll 14, and is supplied to the automatic screen printing machine 5. Creamy solder is printed on the sheet 13 by this automatic screen printing machine 5, and the sheet 3 is supplied to the heating roll 12 together with the group of linear thermal conductors 3 via guide rolls 17, 18, 19. This heating roll 1
2, the cream-like solder is transferred and fixed to the linear thermal conductor, and when it becomes a pin fin member, the linear thermal conductor 3 is embedded in the solder that becomes the fixing member 2a. The object sheet 26 is attacked.

In this case, the group of linear thermal conductors 3 is completely embedded in the fixing member 2a. Alternatively, a part of the linear thermal conductor 3 may be embedded in the fixing member 28,
The point is that it is sufficient if the group of linear heat conductors 3 can be completely fixed.

After that, the integral fixing sheets 1 to 26 were passed through a presser roll 20 to separate the sheet 13, and then passed through a guide roll 21 and a heating furnace 23 to melt the fixing member and completely fix the linear thermal conductor 3. After that, solidify it and make it into a composite seal 2
7 is obtained.

An example of the composite Sea I.27 made in this way is shown in the third section.
It is shown as a composite sheet 27a in Figure (A>).

The composite sheet I- consisting of the group of linear heat conductors 3 and the solid member 2a is produced by a method other than the method shown in FIG. You can.

The composite sheet 27 is attached to a pair of pick-up rolls 6.6.
' After passing through ', it is wound up on a roll 25. The separated sheet 13 passes through a press roll 20 and a guide roll 21, and then is wound up on a sheet winding roll 22.

Next, FIG. 3(B) shows another example of the composite sheet.

The composite sheet 27b shown in FIG. 3(B) is as shown in FIG. 1(B).
This is a composite sheet used when manufacturing a corrugated pin fin member 1b shown in Fig. 1, in which other fixing members 2c are preferably arranged at equal intervals between fixing members 2b. The fixing member 2c is used to keep the mutual spacing between the plurality of linear heat conductors 3 constant and more accurate in the longitudinal direction,
Usually, an organic thread is used that can be removed by burning out or the like before it becomes a corrugated pin fin member. The application of these organic threads to the group of linear thermal conductors 3 is as follows:
3, a method in which organic matter is separately added to the yarn and transferred to the linear thermal conductor, or a nozzle that reciprocates in a direction perpendicular to the group of linear thermal conductors 3 is provided, and from this nozzle This can be carried out by a method of linearly extruding and applying a thermoplastic resin or a thermosetting resin onto the group of linear thermal conductors 3, or the like.

The pitch Z2 of the linear heat conductor 3 shown in FIG. 1(A) does not necessarily have to be equal, and may be set arbitrarily depending on the purpose.

Next, as a method for forming the composite sheet 27 of the linear heat conductors 3 fixed in parallel at intervals into a corrugated I state, the corrugated fins of the conventionally known corrugated type heat exchanger are formed. For example, as shown in FIG. 4, a corrugated sheet 27a is fed between a pair of upper and lower corrugated molding gears 28 and 28', and compression molded into a corrugated I shape. A corrugated pin fin member 1a as shown in ) is obtained.

In this case, it is necessary to manufacture the composite sheet 27a and form the corrugate 1~ so that the fixing member 2a is placed on the curved top 4 of the corrugate 1~, and when using the composite sheet 27b, the corrugate The fixing member 2b is attached to the curved top 4 of
It is necessary to fabricate the composite sheet 1-27b and corrugate it so that the fixing member 2C is aligned with the standing portion of the linear heat conductor 3.

Next, a method for manufacturing a heat exchanger with pin fins using the corrugated pin fin members 1a and 1b shown in FIGS. 1(A) and 1(B) will be described with reference to FIGS. 5(A) to 7. explain.

Note that in the corrugated pin fin members in FIGS. 5(A) to 7, only one linear thermal conductor 3 is shown for convenience of explanation, but in reality, as shown in FIG. 1(A), A plurality of linear thermal conductors 3 are arranged in parallel at intervals at the rear of the page.

First, the corrugated pin fin members 1a and lb are attached to the pipes 30 and 30' for fluid in the heat exchanger (Fig. 6 (A>
, see FIG. 6(B)) to obtain corrugated pin fin members 29a and 29b.

(See FIG. 5(A) and FIG. 5(B)). That is, the height hl of the corrugated pin fin members 29a and 29b is set to match the spacing h2 between the adjacent internal fluid pipes 30.30', and the length 11 is set slightly shorter than the length 2□ of the pipe 30.30'. do.

These pin fin members 29a and 29b are connected to the inner fluid pipe 30, 30' as shown in FIG. 6(A) and FIG. 6(B).
The corrugate-shaped curved top part 4 inserted between the pipes 30 and 30' is soldered or brazed to the surface of the internal fluid pipe 30, 30'. At this time, in the case of the pin fin member 29b, since the organic material thread 2c is used, the organic material must be burnt out at the same time as soldering or brazing, or the soldering or brazing must be performed using hot water or chemicals afterward. Remove the seventh
A component of the pin-finned heat exchanger shown in the figure is obtained. In addition, when joining the internal fluid pipe 30, 30' and the pin fin members 29a, 29b, a solder material or a brazing material may be applied only to the internal fluid pipe, or to the pipe surface and the curved top portion 4 of the fin member.

A heat exchanger can be obtained by combining a required number of the above-mentioned components and providing an inlet, an outlet, etc. for receiving the fluid in the pipes.

Note that, as shown in FIG. 1(A), if the organic thread 2c is not used for the fixing member 2c, it becomes unnecessary to remove the organic thread 2c, and the process can be simplified. In addition, in the corrugated pin fin member of the present invention, the fixing member 2C is made of a material that is solid at room temperature and melts when heated to become a welding material. The connection with the conductor can be made by simply heating the pin fin member and the pipe without using solder or brazing metal, and if solder or brazing metal is used, the connection can be made more secure. Helpful.

〔Example〕

The corrugated pin fin member of the present invention will be described in further detail below with reference to Examples.

Using a device similar to the device shown in FIG.
A composite sheet 27a consisting of the linear thermal conductor 3 and the fixing member 2a shown in FIG.

The manufacturing conditions at that time are shown below.

Linear heat conductor cross-sectional shape: Circle Diameter: 200 μmφ Material: Copper creel Number of threads: 240 Yarn feeding method: Bobbin rotation, weft removal, pick-up circumferential speed: 1 m/min Reed used: 5028 blades/1 nch (therefore, reed pitch: 0.5 mm) Z2 = 0.5 mm Material of fixing member: cream half 1) (manufactured by Nihon Genma Co., Ltd.) Product number: Solder cream T3721DM-262GJ Fixed condition pitch: P 9 mm Heating roll: 180°C Heating furnace: 180°C The above composite sheet was divided into 10 widthwise parts (medium 12m
m) was corrugated using an apparatus similar to the apparatus shown in FIG. 4 to produce the pin fin member 1a shown in FIG. 1(A).

The manufacturing conditions at that time are shown below.

Corrugate height: 8 mm Corrugate pitch Z: 11 mm In the pin fin member manufactured under the above conditions, the outer circumferential length X of the linear thermal conductor 3 of the present invention is 0.628, and the arrangement of the fin forest portions of the linear thermal conductor 3 is The density Y is 1.5 lines/mm. After cutting this pin fin member 1a into 1.=25 cm, a heat exchanger with corrugated pin fins is made as explained based on FIGS. 5(A) to 6(A).
When its performance was investigated, it showed excellent heat exchange performance.

〔Effect of the invention〕

Since the pin fin member according to the present invention is configured as described above, when used as a pin 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 fixing members, making it possible to manufacture a heat exchanger with excellent performance as described above. It can be easily done.

[Brief explanation of drawings]

FIG. 1(A) is a perspective view showing an example of a corrugated pin fin member according to the present invention, and FIG. 1(B) is a perspective view showing another example of the corrugated pin fin member according to the present invention. The figure is a schematic front view showing an example of an apparatus for making a composite sheet from a plurality of linear heat conductors and fixing members, and FIG. 3 (A) is a corrugated pin fin of FIG. 1 (A, ). 3(B) is a plan view showing the composite sheet used for manufacturing the corrugated pin fin member shown in FIG. 4(B), and FIG. FIG. 5(A) is a perspective view showing an example of an apparatus for making a pin fin member of the present invention by corrugating a composite sheet; FIG.
5(B) is an enlarged front view of the pin fin member having the structure shown in FIG. 1(B), cut to a predetermined size; FIG. , FIG. 6(A,) is a front view showing a state in which the pin fin member shown in FIG. 5(A) is joined between adjacent heat exchanger pipes, and FIG. 6(B) is a front view showing the pin fin member shown in FIG. 5(A). FIG. 7 is a front view showing a state in which the pin fin member shown in (B) is joined between adjacent heat exchanger pipes, and FIG.
It is a front view explaining the state after the organic thread in the pin fin member joined between the pipes shown in B) is removed. la, lb... Corrugated pin fin member (present invention), 2a, 2b... Fixing member, 3... Linear thermal conductor, 27a, 27b---Composite sheet, 28.28'.
...Corrugated molded gear, 30.30'...Pipe for internal fluid.

Claims (1)

[Claims] The plurality of linear thermal conductors are configured to include a plurality of linear thermal conductors arranged in parallel and at predetermined intervals, and a fixing member arranged perpendicular to the linear thermal conductors. the fixing member is arranged at least at the curved top of the corrugate, and the fixing member arranged at the curved top is solid at room temperature and melts when heated. A corrugated pin fin member characterized in that it is made from a material that serves as a welding material.