JPH03181795A - Pin fin member for heat exchanger - Google Patents

Abstract

PURPOSE:To provide some pin finned members for a heat exchanger having a better heat transfer efficiency by a method wherein a linear-like thermal conductor stripe having either a brazing material or a soldering material is arranged at a bent top part of a corrugated member. CONSTITUTION:As corrugated linear thermal conductor stripe of pin fin member for a heat exchanger, pure metallic fine wire or alloy fine wire made of silver, copper, aluminum or metallic fine wire coated with soldering plating or tin plating on the metallic fine wire and wire having brazing material or soldering material clad formed on the pure metallic fine wire or alloy fine wire or the alloy fine wire of brazing or soldering material can be applied. Pin fin members 1a are cut in compliance with a size of the inner pipe fluid pipes 10, 10' of the heat exchanger to get a pin member 11a. Then, the fin member 11a is held between the inner pipe fluid pipes 10 and 10' so as to solder the connecting thermal transmittance stripe 3 with the surfaces of the pipes 10 and 10' for the corrugated top part. As a result, it is possible to get a wire diameter and an arranging density to get a desired efficiency of heat exchanging operation in an easy and highly 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. Furthermore, heat exchange efficiency can be improved by increasing the attachment density of the bottle-shaped 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, studies have been made to provide a heat exchanger having excellent pin-like fins using many complicated 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 implementing the structure of a pin fin heat exchanger with good heat transfer efficiency. With the goal.

[Means to solve the problem]

The object of the present invention is to provide a plurality of linear heat conductor threads arranged in parallel and at predetermined intervals, and a linear heat conductor thread arranged perpendicularly to the threads and having a brazing material or a solder material. The linear heat conductor thread is formed into a corrugated shape in the direction of the plurality of linear heat conductor threads, and has the brazing material or solder material. This is achieved by a pin fin member for a heat exchanger, which is characterized in that it is arranged at the curved top of the heat exchanger.

The pin fin member is arranged perpendicularly to a plurality of linear heat conductor threads (hereinafter referred to as linear heat conductor threads for corrugates) arranged in parallel and at predetermined intervals, and Linear thermal conductor yarn with brazing material or soldering material (
(hereinafter referred to as linear thermal conductor yarn for bonding), or in addition to the above two types of yarn, other yarns may be used for the purpose of disciplining the fabric-like integral object, etc. For example, organic threads may be used. The pin fin member of the present invention also includes cases where these other threads are used.

Such a corrugated pin fin member is arranged between two adjacent pipes for fluid in the pipe, and the pin fin member includes a corrugated linear heat conductor thread and a joining linear heat conductor thread. The curved top part of the corrugated fabric (hereinafter simply referred to as fabric) is placed so as to contact the pipe for internal fluid, and at the contact point, the corrugated linear thermal conductive system and the bonding linear thermal conductor are placed. A heat exchanger with pin fins can be obtained by fixing the conductor thread to the pipe for internal fluid.

The corrugated linear thermal conductive material used in the pin fin member for a heat exchanger of the present invention may be a thin pure metal wire or an alloy thin wire made of silver, copper, aluminum, etc., or a thin metal wire obtained by applying solder plating, tin plating, etc. to the above metal wire. Can be used.

There are no particular limitations on the cross-sectional shape of the linear heat conductor thread, 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 thread with a nearly circular cross section. .

The thermal conductivity of the linear thermal conductor thread is 0.038ca i'
/ Cm/sec/l: The above is preferable, and depending on the application, a linear thermal conductor thread having a more appropriate thermal conductivity can be selected and used.

The linear heat conductor thread for bonding used in the pin fin member for a heat exchanger of the present invention may be a pure metal thin wire or alloy thin wire made of silver, copper, aluminum, etc. clad with a brazing material or solder material, or a brazing material. For example, Aj knee Si, AA-si-Mg+Pb-3n alloy can be used as solder material alloy thin wire.

The thermal conductivity of the linear thermal conductor yarn for joining is 0.038c.
It is preferable that al/cm/sec/ or more, but depending on the application, a linear thermal conductor thread having a more appropriate thermal conductivity may be selected and used.

Further, the cross-sectional shape is not particularly limited, but may be appropriately selected in consideration of ease of making the fabric, reliable fixation to the pipe for internal fluid, etc.

The structure of the fabric used in the pin fin member for a heat exchanger of the present invention is such that woven fabrics, knitted fabrics, or linear heat conductor yarns are made to intersect with each other (including the case where they are stacked one on top of the other), and the intersections are bonded by means such as heat welding. It is possible to use a material bonded by the above method. In addition, organic yarns other than the above-mentioned two types of linear thermal conductor yarns used in manufacturing the fabric include polyester, polyamide, polyacrylonitrile, polyethylene, polypropylene, polyvinyl alcohol, etc., or copolymers thereof. Threads made of synthetic fibers, cellulose acetate, regenerated cellulose, etc., as well as natural fibers made from animals and plants, can be used.

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 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 heat conductor thread and the arrangement density of the plural corrugated linear heat conductor threads satisfy the following formula.

0.25≦X≦2.5 0.5≦XY≦2.5 In the above formula, X is the outer circumference length (
+nm), and Y is the arrangement density (strands/mm) of linear thermal conductor threads.

has been done. 9 linear thermal conductive system strips 3a for corrugate
- 31 are organized by joining linear thermal conductor threads 2 and organic threads 4 at intervals. Figure 1 (A)
As shown in the figure, the interval between two adjacent corrugated linear heat conductor strips 3 is defined as Z2°. Each corrugated linear thermal conductive line 3 is curved in a corrugated shape, and 1
The distance between the center of the curved apex 5 of one linear heat conductor thread 3 and the center of the adjacent curved apex 5 of the same linear heat conductor thread 3, in other words, as shown in FIG. 1(A) In this example, the distance between two adjacent parallel portions of one linear heat conductive strip 3a for corrugation is defined as 21.

From the value of Z1, the arrangement density Y1 of the linear heat conductive strips for corrugates in the longitudinal direction of the linear heat conductive strips for corrugates
is calculated, and on the other hand, the arrangement density Y2 of the linear heat conductive strips for corrugates in the direction perpendicular to the longitudinal direction of the linear heat conductive strips for corrugates 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, Y1 is 0.2 lines/mm~
10 lines/mm, Yz is 0.2 lines/mm to 10 lines/mm
A range of is preferred.

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

When X > 2.5, the wire diameter of the linear thermal conductor yarn 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 strip for pin fins becomes small, making it difficult to obtain a high heat exchange rate.

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

FIG. 1(A) and FIG. 1(B) schematically show an example of a pin fin member for a heat exchanger according to the present invention.

The pin fin members 1a and lb illustrated in FIG. 1(A) and FIG.
are arranged parallel to each other at predetermined intervals in the fabric as shown by 3a...31 in FIG. A linear thermal conductor yarn 2 is located. The number of linear thermal conductor threads 2 for bonding may be appropriately selected and used.

Next, a method of manufacturing the pin fin members 1a and 1b of the present invention illustrated in FIGS. 1(A) and 1(B) will be described. FIG. 1(A) shows a fabric woven using a conventionally known loom. Figure 1 (B) shows a conventional loom with new functions added.
That is, in order to prevent misalignment of the weft immediately after inserting the joining linear thermal conductor yarn 2 as the weft and beating the weft, a means for fixing the intersecting point of the warp and weft using, for example, a heater is provided. This is an example of a fabric woven using a loom.

Figure 2 (A) shows a corrugated linear thermal conductor strip 3 in the warp.
Linear thermal conductor yarn 2 and organic yarn 4 for joining to the weft
This is a mixed weave plain woven fabric 6a woven using. Figure 2 (B
) is a mixed weave plain woven fabric 6b which is woven using a corrugated linear heat conductor thread 3 for the warp and a bonding linear heat conductor thread 2 for the weft. In this case, the woven fabric may be plain weave, twill weave, or any variation based on these.

In the above weaving, linear thermal conductive material for corrugate 3
may be used as the weft, and the linear thermal conductor yarn for joining 2 and the organic material yarn 4 may be used as the warp, and the linear thermal conductive yarn for corrugation 3 and the linear thermal conductive yarn for joining may be used as the warp and weft. The thread 2 and the organic thread 4 may be used together.

Moreover, in FIG. 3, a linear thermal conductive yarn 3 for corrugation is placed in the warp direction, and a linear thermal conductive yarn 2 for bonding and an organic yarn 4 are placed in the weft direction.
An example of a knitted fabric 8 with warp and weft yarns inserted using the organic yarn 7 in the ground structure is shown as a model.

In the knitted fabric 8, the corrugated linear thermal conductive strip 3
may be in the weft direction, and the bonding linear thermal conductor yarn 2 and organic yarn 4 may be in the warp direction. Further, the linear thermal conductor yarns 2 and 3 and the organic yarn 4 may be used in both the warp and weft directions.

Next, as a method for forming the fabrics 6a, 6b, 8, etc. into a corrugated state, a conventionally known corrugated molding machine for forming plate-like corrugated fins of a corrugated heat exchanger is used.
For example, as illustrated in FIG. 4, it is possible to use a method in which the fabric 6a is fed between a pair of upper and lower corrugated press gears 9, 9' and compression molded into a corrugated shape. A pin fin member 1a is obtained.

In this case, it is necessary to process the corrugated wire so that the linear thermal conductor 2 for joining is located at the curved top 5 of the corrugate.

Next, a method for manufacturing a heat exchanger with pin fins using the pin fin member 1a illustrated in FIG. 1 (A>) will be described with reference to FIGS. 5 to 7.

Note that in the pin fin members in FIGS. 5 to 7, only two corrugated linear thermal conductive strips 3 are shown for convenience of explanation, but in reality, they are shown in FIGS. 1(A) and 1(B). As shown, a plurality of corrugated linear thermal conductor strips 3 are arranged in parallel at intervals at the rear of the page. In addition, in the following explanation, a case will be explained in which the fabric is a mixed weaving plain weave, and a corrugated linear thermal conductive yarn 3 is used as the warp, and a bonding linear thermal conductive yarn 2 and an organic material yarn 4 are used as the weft. .

First, the pin fin member 1a is cut to match the size of the internal fluid pipe 10.10' of the heat exchanger (see FIG. 6) to obtain the pin fin member 11a (see FIG. 5). That is, the height hl of the pin fin member 11a is set to match the interval h2 between the adjacent internal fluid pipes 10, 10', and the length l is set slightly shorter than the length 12 of the pipes 10, 10'.

As shown in FIG. 6, this fin member 11a is inserted between the pipes 10 and 10' for fluid in the pipe, and the corrugated top part of the linear thermal conductor thread 3 for joining and the pipe 10 are inserted.
, 10' are soldered. At this time, since the pin fin member 11a uses an organic thread 4, the organic matter must be burnt out at the same time as the soldering, or the soldering may be removed later using hot water or chemicals, and the finned fibers shown in FIG. A component of the exchanger is obtained. Note that a solder material may be applied to the fluid pipes 10 and 10' in advance before joining the fluid pipes 10 and 10' to the pin fin member 11a. A heat exchanger can be obtained by combining a required number of the above components and providing an inlet, an outlet, etc. for receiving the fluid in the pipes.

Thus, for example, in this example, Z2:0.51111
O.

A pin fin member is obtained by corrugate molding at ZI=1111[11, height h=3 mm.

In addition, as shown in FIG. 1(B), when the linear thermal conductive yarn 3 for corrugation is used for the warp and only the linear thermal conductive yarn 2 for bonding is used for the weft, the organic material yarn 4 is Removal is not necessary, and the process can be simplified.

Further, the arrangement pitch (thread/thread) and size of the organic threads 4 shown in FIG. 1(A) may be appropriately selected in consideration of ease of handling during manufacture of the pin fin member.

〔Example〕

Hereinafter, the pin fin member according to the present invention will be explained in more detail by way of examples.

The fabrics shown in FIG. 2(A) and FIG. 2(B) were woven under the following conditions.

Yarn type of the following margin weave: Aqueous polyvinyl alcohol 20d Warp type: Copper wire 200 dia. Using a 32 gauge warp knitting machine, 20 d of polyvinyl alcohol fibers are fed from one reed to knit a single reed weave. death,
A copper wire of 200j1 mφ was inserted in the warp into silk fabric, and a solder wire and water-soluble polyvinyl alcohol were inserted in the weft at appropriate intervals to knit a knitted fabric with warp and weft insertion of F11110 cm.

The fabric was cut into 100 pieces in the width direction (11 mm in the fabric) and then corrugated using a device similar to the device shown in FIG. 4 to obtain the fabrics shown in FIGS. 1(A) and 1(B). and a pin fin member made of silk (not shown).

The manufacturing conditions at that time are shown below.

Corrugate height hI8InI11 Corrugate pitch 21 1 plate The pin fin member manufactured under the above conditions has an outer circumferential length The arrangement density Y of the fin forest is 1.5 fins/mm (1.1 fins/m
m). After cutting this pin fin member to L = 25 cm, a heat exchanger with pin fins was made based on the method illustrated in Figs. 5 to 7, and its performance was investigated, and it was found that it had excellent heat exchange performance. Ta.

〔Effect of the invention〕

Since the corrugated fin member according to the present invention is configured as described above, when used as a fin of a finned heat exchanger, the wire diameter and arrangement density for obtaining the desired heat transfer efficiency can be easily and precisely achieved. In addition, since the heat exchanger can be attached to the pipe for internal fluid in a fabric state, it is possible to easily manufacture a heat exchanger having excellent performance as described above.

[Brief explanation of drawings]

FIG. 1(A) is a perspective view showing an example of a pin fin member for a heat exchanger according to the present invention, and FIG. 1(B) is a perspective view showing another example of the pin fin member for a heat exchanger according to the present invention, FIG. 2(A) and FIG. 2(B) are perspective views respectively showing an example of a fabric used for manufacturing a pin fin member for a heat exchanger according to the present invention, and FIG. FIG. 4 is a plan view illustrating the structure of another example of the fabric used to manufacture the pin fin member, and FIG. FIG. 5 is a front view of the pin fin member shown in FIG. 1 (A) cut to predetermined dimensions, and FIG. 6 is a front view of the pin fin member shown in FIG. FIG. 7 is a front view showing a state in which a component of the heat exchanger with pin fins is obtained by melting the dissolvable threads in the fin member shown in FIG. 6. It is a diagram. la, lb...pin fin member (present invention), 2...
Linear heat conductor thread having brazing material or solder material (linear heat conductor thread for bonding), 3... Linear heat conductor thread for corrugate, 4... Organic material thread, 6a, 6b , 8...Fabric, 10, 1
0'...Pipe for internal fluid. (A) 1h Figure (A) b (B) Figure Figure 9' Figure Figure 0 Procedural Amendment (Voluntary) December 4, 1997

Claims (1)

[Claims] A plurality of linear heat conductor threads arranged in parallel at predetermined intervals, and a linear heat conductor thread arranged perpendicularly to the threads and having a brazing material or a solder material. and is formed into a corrugated shape in the direction of the plurality of linear heat conductor threads, and the linear heat conductor thread having the brazing material or solder material is arranged at the curved top of the corrugate shape. A pin fin member for a heat exchanger, characterized in that: