WO2012001759A1

WO2012001759A1 - Variable-circumference tubular body

Info

Publication number: WO2012001759A1
Application number: PCT/JP2010/060981
Authority: WO
Inventors: 裕道脇
Original assignee: Michiwaki Hiroshi
Priority date: 2010-06-28
Filing date: 2010-06-28
Publication date: 2012-01-05
Also published as: KR20130088758A; JPWO2012001759A1

Abstract

Disclosed is a heat exchange tube or catalytic reaction tube capable of highly efficient heat exchange and catalytic reaction by enlarging the surface area of the inner circumferential surface of a tubular body while saving the amount of the constituent material of a tubular body and a required occupied volume and shortening a time required for heat exchange without elongating a heat exchange distance. Specifically disclosed is a variable-circumference tubular body (1) which is so formed as to differentiate the circumferential lengths at two or more different positions along the axial direction from each other while the cross-sectional areas of the internal space surrounded by the inner circumferences of the cross sections orthogonal to the axial direction at any optional positions in the axial direction are almost equal. Almost without compressing the fluid flowing inside the variable-circumference tubular body, the number of the molecules of the fluid that come into contact with the inner circumferential surface can be increased.

Description

Rotating cylindrical body

The present invention relates to a cylindrical body or pipe material, and in particular, a heat exchanger for circulating a fluid inside and efficiently exchanging heat of the fluid and external heat, piping thereof, or the like on the inner surface. The present invention relates to a tube material or the like for forming a catalyst layer and causing a passing fluid to undergo a catalytic reaction.

Conventionally, as disclosed in Patent Document 1, the heat exchanger can be formed into a tubular material having good thermal conductivity such as copper and aluminum, and the fluid to be heat exchanged can be circulated therein, The heat exchange between the heat of the fluid and the external heat is efficiently performed, and the heat exchange pipe that can efficiently bring the temperature of the fluid close to the external temperature is included. .

As disclosed in Patent Document 2, a metal pipe used for a heat exchanger, that is, a heat exchange pipe, has a contact area between the pipe and the outside by connecting a heat sink to the outer periphery of the pipe. It is often configured to increase the heat exchange efficiency by making it larger, and it is configured to make the heat exchange time longer by meandering the pipe material and setting a longer heat exchange distance. There are many.

On the other hand, as disclosed in Patent Document 3, the catalyst tube or the like has a large number of elongated holes having a catalyst layer formed on the inner peripheral surface, or a regular hexagonal tubular material is converged. In many cases, a honeycomb structured tube is used.
Japanese Patent Laid-Open No. 11-256358 Japanese Patent No. 3192622 JP 2008-178858 A

Such a conventional heat exchange tube is set so that the contact area between the outer surface of the tube material and the outside becomes wider by providing a heat sink on the outer periphery of the tube material, but just by providing a heat sink on the outer surface of the tube material, Only the outer surface area with respect to the inner surface area of the tube material is significantly increased.

In other words, in this structure or method, heat from the fluid flowing through the inside of the pipe can be transmitted only to the inner surface of the pipe having a small surface area, and is narrowed down on the inner surface when the outer surface of the pipe is enlarged. The heat transmission amount is to be transmitted to the outside through the pipe material which is a thermal resistor, and the narrowness of the inner surface area of the pipe material has been an impediment to improving the thermal efficiency.

Moreover, in the conventional heat exchange pipe, in order to improve the low heat exchange efficiency due to the narrowness of the inner peripheral area, a method of extending the heat exchangeable distance by setting the pipe length long is adopted. However, this requires a long heat exchange time and a problem that a required space volume increases.

On the other hand, a conventional catalyst tube is formed by converging a plurality of regular hexagonal cylindrical tubes, so that a large number of overlapping regions are formed, and is problematic from the viewpoint of space saving and resource saving.

The present invention was created in view of the above-mentioned problems, and while suppressing pressure loss to a high degree, increasing the amount of heat transmitted through the peripheral surface of the cylindrical body while omitting the amount of material constituting the cylindrical body and the required occupied volume. An object of the present invention is to provide a heat exchange tube capable of shortening the time required for heat exchange without causing an increase in the length of the cylindrical body, that is, a heat exchange distance, and thereby allowing heat exchange to be performed with high efficiency. To do.

Another object of the present invention is to provide a catalytic reaction tube capable of improving the catalytic reaction efficiency while saving space and resources.

In order to achieve the above-mentioned object, the means adopted by the variable cylindrical body of the present invention is that an appropriate material is formed into a cylindrical shape, and the inner periphery of a cross section orthogonal to the axial direction at an arbitrary position in the axial direction. It is characterized in that the cross-sectional areas of the inner space surrounded by the same are almost equal everywhere, and the circumferential lengths at two or more different positions in the axial direction are different from each other.

It is characterized in that it has a short circumferential region having a relatively short circumferential length and a long circumferential region having a longer circumferential length than the circumferential length of this short circumferential region. Further, the shortest circumferential region has the shortest circumferential region set to the shortest circumferential length, and the longest circumferential region has the longest circumferential region set to the longest circumferential length.

In the axial direction, the distance of the long circumference region is set longer than the distance of the short circumference region.

The cross-sectional shape in the axial direction is characterized by being continuously deformed along the axial direction.

The cross-sectional shape at least on one end side in the axial direction is circular, and the cross-sectional shape is deformed into a substantially oval shape or a substantially oval shape toward the other end side, and the eccentricity is 0 to 1 It is characterized by having an inner peripheral surface shape that continuously approaches toward the surface.

The cross-sectional shape at both ends in the axial direction is circular, and the cross-sectional shape is deformed into a substantially oval or a substantially elliptical shape toward the center in the axial direction, and the eccentricity is from 0 to 1. It is characterized by having an inner peripheral surface shape that approaches continuously.

It is characterized in that the cross-sectional shape of the cylindrical body has a portion that forms a substantially fractal plan view shape.

A rectifying unit is provided on the inner peripheral surface, the rectifying unit is provided in a transition region in a process of transition from the shortest peripheral region to the longest peripheral region, and the rectifying unit is further provided in the peripheral surface of the process region. It is characterized by being formed by projecting from the inside toward the inside. Further, the rectifying unit is formed by fixing a separate member on the inner peripheral surface.

ヒートシンク A heat sink is provided on the outer peripheral surface.

According to the present invention, while setting the internal space cross-sectional area of an arbitrary cross section in the axial direction of the cylindrical body to be almost equal throughout, the cross-sectional shape is continuously changed in the axial direction, and the circumferential length is By providing a relatively small region and a region having a relatively long circumference, it is possible to flow the fluid flowing through the inside of the cylindrical body with little compression, but a region having a long circumference is set. When passing, most of the fluid can be brought into contact with the inner peripheral surface of the cylindrical body, thereby significantly improving the heat exchange efficiency between the cylindrical body and the circulating fluid, or by the catalyst contacting the catalyst layer. Reaction efficiency can be improved.

In comparison between the conventional general cylindrical tube material and the cylindrical body of the invention, even if the material usage is equal to each other and the internal space sectional area is equivalent, the cylindrical body of the invention While reducing the required occupied volume, the surface area of the inner peripheral surface or the outer peripheral surface can be remarkably increased, and the distance can be reduced.

Further, when the internal space volume is made equal, comparing the conventional general cylindrical tubular material with the cylindrical body of the present invention, the surface area of the inner peripheral surface or the outer peripheral surface of the cylindrical body of the present invention is remarkably increased. I can do it.

In addition, when the fluid is caused to flow down into the cylindrical body, the heat exchange amount or the catalytic reaction amount can be improved in spite of the fact that the flow distance is shortened and the time is shortened. .

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings (FIGS. 1 to 6). FIG. 1 schematically shows an embodiment of a variable cylindrical body 1 according to the present invention as a three-sided view. The variable cylindrical body 1 of the present embodiment is a copper tube formed in a cylindrical shape for the purpose of heat exchange, but of course the constituent materials and applications are not limited to these, for example, the inner circumference It goes without saying that a catalyst layer may be provided on the surface layer of the surface to contribute to the catalytic reaction.

As shown in FIGS. 1 (a) to 1 (c), the variable cylindrical body 1 of the present embodiment is the longest circumferential length formed in a cylindrical shape with an appropriate thickness and an appropriate inner diameter from one end S. The shortest first shortest peripheral region 2 and the end E1 of the first shortest peripheral region 2 are set as the starting end S1, the internal cross-sectional areas of all the cross sections are equally constant, and the eccentricity is 0 from the axial direction. The first transition region 3 having an elliptical cross-sectional shape that continuously transitions toward the end toward 1 and the end E2 as a start end S2 are extended in the axial direction with a constant cross-sectional shape and set to the longest circumference. The longest circumferential region 4 and the end E3 as the start S3, the cross-sectional shape in which the internal cross-sectional area of all the cross-sections is equal and constant, and the eccentricity continuously shifts toward the end E4 along the axial direction toward zero Is an elliptical second transition region 5 and this end E4 is a start end S4, and the other end E of the variable cylindrical body 1 Constructed and a second minimum circumferential region 5 formed in a cylindrical shape which terminates E5.

The internal space cross-sectional area surrounded by the material constituting the variable cylindrical body 1 in an arbitrary cross section of the variable cylindrical body 1 is set to be equal throughout.

That is, an arbitrary position in the axial direction of the variable cylindrical body 1 is i, an internal space cross-sectional area at this position i is S _i , an arbitrary position in the axial direction different from the position i is j, and an internal space at this position j The cross-sectional area is S _j , a certain position in the axial direction is m, the circumferential length of the inner circumferential surface at this position m is C _m , the certain position in the axial direction different from the position m is n, and the inner circumferential surface at this position n when the circumferential length of the the _{_{_{C n, S i = S j}}} ∧C m <C n (m ≠ n∈i ≠ j) holds.

FIG. 2A shows each of the first shortest peripheral region 2, the first transition region 3, the longest peripheral region 4, the second transition region 5, and the second shortest peripheral region 5 of the variable cylindrical body 1. FIG. 2B is a diagram showing the internal cross-sectional shape of each cross section corresponding to those positions. FIG. 2B, each internal cross section AA ′, BB ′, CC ′, DD ′, EE ′, FF ′, GG ′, HH. Of course, ', II', JJ ', and KK' are all equivalent to each other.

The variable cylindrical body 1 of the present embodiment is configured as described above. For example, when a gas phase fluid is caused to flow down inside, the gas phase fluid is represented as a plurality of fluxes F (FIG. 3A). As shown in FIG. 3, in the first shortest peripheral region 2 (or the second shortest peripheral region 6) having a circular cross-sectional shape, the flux that is in contact with the inner peripheral surface of the first shortest peripheral region 2 F is only a very small part of the entire flux F. On the other hand, in the longest circumferential region 4 shown in FIG. 3B, all the fluxes F are in contact with the inner circumferential surface of the longest circumferential region 4. ing.

That is, as can be seen from the schematic diagram of FIG. 3, the surface area of the inner peripheral surface is larger in the region where the circumferential length is longer than the region where the sectional area is the same but the circumferential length is different and the circumferential length is short. The specific surface area can be set significantly larger than that of the cylindrical body.

Thereby, when a fluid is allowed to pass through the inside of the variable cylindrical body 1, the pressure loss can be suppressed as much as possible, and the fluid can flow down almost uncompressed. More fluid molecules can be brought into contact with each other, and the heat exchange efficiency and the catalytic reaction efficiency can be remarkably improved.

Here, the cross-sectional shape of the variable cylindrical body 1 of the present embodiment is configured such that one end forming a circular shape transitions to an elliptical shape from the center to the axial center, and then changes to a circular shape from the center to the other end again. However, the cross-sectional shape is not limited to this, and for example, as shown in FIG. 4, the end E ′ of the variable cylindrical body 11 may be a shape that is a square and gradually transitions to an elongated rectangle. is there. Alternatively, a part of the axial direction may have a portion having a substantially fractal shape as shown in FIG. 5, and in this case, the internal cross-sectional area in the cross-section is set to a finite constant size. However, the circumference can be made extremely large. This is due to the fact that a planar fractal closed figure has a finite area, but its perimeter is greater than any positive constant K.

In addition, the planar shape of the variable cylindrical body of the present invention is not only a monotonous shape as shown in FIG. 1 (a), but also a curved portion with a constricted center as in the variable cylindrical body 101 shown in FIG. Can be configured in a closed figure shape, and can be set to a closed figure formed by a combination of arbitrary curves and straight lines. From these meanings, it can be said that there are an infinite number of shapes that can be taken by the variable cylindrical body of the present invention.

Further, a flow regulating body such as a flow straightening plate or a flow straightening strip may be provided at an appropriate portion inside the variable cylindrical body, and the fluid flowing through the inside may be flow straightened. In this case, it is particularly effective to form in the transition region. However, the present invention is not limited to this and can be formed at a desired site. As shown in FIG. 7, the rectifying body 7 may be recessed from the upper and lower outer peripheral surfaces of the variable diameter cylindrical body 201 toward the inside, and may be projected in a strip shape. Of course, when the rectifying body 7 is provided, the surface area inside the variable diameter cylindrical body 201 can be increased, so that the heat exchange efficiency and the catalytic reaction efficiency can be further improved.

Alternatively, as shown in FIG. 8, the fluid production 7 a may be provided separately on the inner peripheral surface of the variable cylindrical body 301 as previously formed separately. In this case, the variable diameter cylindrical body 301 not only rectifies the fluid flowing down inside, but also has an effect of reinforcing the variable diameter cylindrical body 301.

Further, when a variable cylindrical body is used for heat exchange, as shown in FIG. 9, a heat sink 8 is provided on the outer peripheral surface of the variable cylindrical body 401 to further increase the heat exchange efficiency. Is also possible. Of course, in this case, the heat sink 8 also has an effect of reinforcing the variable diameter cylindrical body 401.

As described above, the variable cylindrical body of the present invention circulates the inside by forming the shape with a changed circumferential length while setting the internal cross-sectional area of every cross section equal. The configuration is such that the number of contact molecules with the inner peripheral surface of the fluid is increased without substantially compressing the fluid, and can be implemented in various forms without departing from the gist thereof.

It is a three-view figure which shows one Embodiment, Comprising: (a) is a top view, (b) is a front view, (c) is a side view. It is a schematic diagram showing that the internal cross-sectional area of an arbitrary cross section of the variant cylindrical body is constant and the circumference is not constant, and (a) shows an appropriate cross-sectional position in the plan view of FIG. (B) is a diagram showing the internal cross-sectional shape of each cross section indicated in (a) at a position corresponding to the indicated position in (a). (A) is a cross-sectional view of an appropriate cross-section of the shortest circumferential region in which the internal cross-section is circular, and schematically shows a state in which a fluid is allowed to flow into the variable-circumferential cylindrical body, (b) is a cross-sectional view of an appropriate cross section of the longest peripheral region whose internal cross section forms an ellipse, and schematically shows a state in which an equal amount of fluid is flowing down to (a). FIG. 3 is a partially enlarged perspective view of a variable cylindrical body having an end shape forming a square cylindrical shape and gradually transitioning from a terminal end to a cross-sectional shape forming a rectangular cylindrical shape. It is a figure which shows a certain cross-sectional shape of the variable diameter cylinder body of one modification, Comprising: It is a schematic diagram which shows that the cross-sectional shape has comprised substantially fractal figure shape. It is a top view of the variable diameter cylindrical body of one modification. It is a figure which shows the structure of the variable diameter cylindrical body of one modification, Comprising: (a) is a top view, (b) is a cross-sectional partial figure of the L-L 'cross section shown to (a). It is sectional drawing of the cross section in the rectification | straightening part formation position which shows the structure of the variable diameter cylindrical body of one modification, Comprising: The separately formed rectification | straightening part is fixed to the inner peripheral surface of a variable diameter cylindrical body. It is a figure which shows the structure of a variable diameter cylindrical body. It is sectional drawing which shows the structure of the variable diameter cylindrical body of one modification.

DESCRIPTION OF SYMBOLS 1 Change cylindrical body 2 1st shortest circumference area 3 1st transition area 4 longest circumference area 5 2nd transition area 6 2nd shortest circumference area 7 Rectifier 7a Fluid 8 Heat sink 11 Variable circumference cylindrical body DESCRIPTION OF SYMBOLS 101 Variable cylindrical body 201 Variable cylindrical body 301 Variable cylindrical body 401 Variable cylindrical body S One end E1 Termination S1 Start end E2 Termination S2 Start end E3 Termination S3 Start end E4 Termination S4 Start end E5 Termination E Other end F Flux E 'end

Claims

An appropriate material is formed into a cylindrical shape,
The cross-sectional area of the inner space surrounded by the inner circumference of the cross section perpendicular to the axial direction at any position in the axial direction is almost equal throughout, and the circumferential lengths at two or more different positions in the axial direction are mutually equal. A variable diameter cylindrical body characterized by being formed differently.
The variable-circumferential cylindrical body according to claim 1, comprising a short circumferential region having a relatively short circumferential length and a long circumferential region having a circumferential length longer than the circumferential length of the short circumferential region.
3. The variable cylindrical body according to claim 2, wherein a distance of the long circumferential region is set to be longer than a distance of the short circumferential region in the axial direction.
4. The variable cylindrical body according to claim 1, wherein the cross-sectional shape in the axial direction is continuously deformed along the axial direction. 5.
The cross-sectional shape at least on one end side in the axial direction is circular, the cross-sectional shape is deformed into a substantially oval shape or a substantially oval shape toward the other end side, and the eccentricity continuously approaches from 0 to 1. The variable cylindrical body according to any one of claims 1 to 4, wherein the cylindrical body has a peripheral surface shape.
Inner circumferential surface having a circular cross-sectional shape on both ends in the axial direction, the cross-sectional shape being deformed into a substantially oval or a substantially elliptical shape toward the center in the axial direction, and the eccentricity continuously approaching from 0 to 1 The variable cylindrical body according to any one of claims 1 to 5, which has a shape.
7. The variable cylindrical body according to any one of claims 1 to 6, wherein a cross-sectional shape of the cylindrical body has a portion having a substantially fractal plan view shape.
The rectifying section according to any one of claims 1 to 7, wherein a rectifying portion is provided on the inner peripheral surface.
The variable diameter cylindrical body according to any one of claims 1 to 8, wherein a heat sink is provided on the outer peripheral surface.