JP4921127B2 - Static mixer - Google Patents

Description

The present invention relates to a static mixer that performs stirring and mixing using a resistor stationary in a flow path .

  Static mixers that perform stirring and mixing with a resistor stationary in a flow path are roughly classified into a turbulent mixing method and a laminar mixing method depending on the structure of the resistor. Of these, the turbulent mixing method is far superior in terms of mixing ability compared to the laminar mixing method, but has the disadvantage that the structure of the resistor is complicated and clogging is likely to occur. .

  Therefore, the present applicant has previously proposed a static mixer for the purpose of solving the problem of the turbulent mixing method (see Patent Document 1). This static mixer effectively generates turbulent flow by arranging a plurality of resistor elements with a simple pair of resistors in the axial direction while shifting them by a predetermined angle in the circumferential direction of the casing. Thus, highly efficient stirring and mixing can be realized, and at the same time, clogging can be greatly suppressed.

  In addition, the present applicant has previously proposed a resistor element for the purpose of solving problems relating to pressure loss and workability at the time of attachment / detachment (see Patent Document 2). This resistor element maintains the ability to generate turbulence by connecting a plurality of resistors to each other via axial columns arranged in a plurality of rows in the circumferential direction along the inner peripheral surface of the pipe. However, it is possible to reduce pressure loss and to reduce the labor of detaching the pipe.

In addition, various types of static mixers have been proposed (see Patent Documents 3 to 9).
Japanese Patent No. 2923402 Japanese Patent No. 3389068 Japanese Utility Model Publication No. 51-36301 Japanese Utility Model Publication No. 55-107273 Japanese Utility Model Publication No. 57-55529 JP-A-62-140631 JP-A-9-131521 JP 2004-351414 A JP 2006-167718 A

  However, in a static mixer, when a small amount of fluid is mixed, it is necessary to reduce the inner diameter in order to maintain a flow rate necessary for mixing, and a static mixer with a small diameter and high efficiency is desired. In addition, the material of the static mixer is preferably an inexpensive paper material in applications where low cost is required for disposable use in the medical field, for example. In addition, ozone gas and water can be mixed in a static mixer to produce ozone water for various types of cleaning applications. However, precision cleaning, such as medical instruments and semiconductors that can cause contamination by trace amounts of harmful substances, can be used. In this cleaning, a fluororesin, particularly PTFE (polytetrafluoroethylene) having good physical properties is suitable, and it is desired to produce a static mixer with an optimum material for such various uses.

  In response to such a request, in the configuration disclosed in Patent Document 1, a resistor is fixed to the inner wall surface of the cylindrical body by welding, brazing, adhesive, or the like. Although it is possible to manufacture with a mold by dividing vertically into parts, the method of fixing has a limit in reducing the diameter because it requires fixing work inside the cylindrical body, and like PTFE There is a disadvantage that it is impossible to manufacture with a material that is difficult to bond. On the other hand, although the method using the mold is not so problematic in terms of reducing the diameter, it is necessary to use a material that can be injected into the mold, so there is a restriction in terms of material, and for example, melting like PTFE Inconveniences that cannot be produced with difficult materials arise.

  Further, the structure disclosed in the above-mentioned Patent Document 2 is manufactured by fixing the support and the resistor to each other, and there is a limit to reducing the diameter because of the need to fix a large number of parts. Thus, there is a disadvantage that it is impossible to manufacture with a material that is difficult to manufacture by bonding.

  In addition, even the configuration disclosed in Patent Documents 3 to 9 sufficiently satisfies the demand that it has a small diameter and high efficiency and can be manufactured with an optimum material according to various applications. I can't.

The present invention has been devised in order to solve such problems of the prior art, and its main purpose is to easily manufacture a small-diameter product, and there are few restrictions on materials, and various It is an object of the present invention to provide a static mixer configured so as to be made of an optimum material according to the application.

To solve such a problem, in the present invention, wherein as shown in claim 1, a processing object can flow tubular casing, a tubular body that is inserted inside the casing, the cylindrical And a protruding piece as a resistor formed so as to protrude from the inner peripheral surface of the cylindrical body toward the center, and this protruding piece is inclined downstream. the plurality provided have your predetermined spacing in the axial direction so as not to contact each other in a state Rutotomoni, a pair of said projecting pieces is protruded from the inner peripheral surface opposite of the tubular body, and collision of one The piece is formed longer than the other so as to intersect the center line of the cylindrical body, and the pair of projecting pieces are arranged in a plurality in the axial direction while being sequentially shifted by a predetermined angle in the circumferential direction, Along the rear surface of the projecting piece and the outer peripheral surface of the cylindrical body Jo reinforcing member has to have been fixed.

  According to this, a projecting piece that becomes a resistor is formed by cutting and raising the peripheral wall of the cylindrical body, and since it can be manufactured by a cutting and bending process, even a small-diameter one can be easily manufactured. It is possible to manufacture with various materials.

In addition, the material of the tube material or the plate material that is the basis of the resistor element composed of the cylindrical body and the resistor body is a material having a toughness that can withstand plastic deformation due to the bending process for forming the projecting piece. Well, for example, it is possible to use materials that are difficult to form by adhesion or mold, such as PTFE, which is suitable for the purpose of manufacturing ozone water used for cleaning medical devices and semiconductors. Various materials such as paper are possible.

Further, in the static mixer, the projecting pieces as the resistors protrude from the inner peripheral surface of the cylindrical body toward the central portion and are predetermined in the axial direction so as not to contact each other in a state of being inclined downstream. And a plurality of fluids that are sequentially shifted by a predetermined angle in the circumferential direction so that the fluid introduced inside collides with one of the projecting pieces without a short path, and the flow collided with the projecting piece. Is distributed in multiple directions around the projecting piece, and a vortex (wake) due to entrainment occurs on the back side of the projecting piece, and the collision, dispersion and entrainment of the circulating fluid by this projecting piece are repeated one after another, Turbulence is generated and the circulating fluid is vigorously stirred.

  For this reason, for example, in the case of a static mixer for gas-liquid mixing, a strong turbulent flow is generated by introducing liquid and gas at the required pressure and flow rate, and the gas-liquid mixture is vigorously stirred. Therefore, the bubbles are finely crushed and fine bubbles are generated at a high density, and high gas-liquid contact efficiency can be realized.

  In addition, since the projecting piece has a simple configuration in which it protrudes from the inner peripheral surface of the cylindrical body in a state inclined to the downstream side so as not to oppose the flow, a fibrous or particulate solid is caught or accumulated. Therefore, it is possible to perform the stirring process without causing clogging even for a fluid containing such solid matter.

  In particular, the pair of projecting pieces protrude from the mutually opposing inner circumferential surfaces of the cylindrical body so as to form a generally C shape, and the other projecting piece crosses the center line of the cylindrical body from the other. A pair of projecting pieces formed in a long shape and arranged in a plurality of sets in the axial direction while sequentially shifting by a predetermined angle in the circumferential direction, and resistor elements including a pair of projecting pieces are sequentially arranged in the circumferential direction. In a configuration in which a plurality of axial lines are arranged side by side while shifting by a predetermined angle, the projecting pieces formed in a long shape so as to intersect with the center line of the cylindrical body are spirally arranged as a whole. Due to the action, a swirling flow around the center line of the cylindrical body is generated in the circulating fluid. For this reason, high stirring performance can be obtained.

In addition, the static mixer according to the present invention can be widely used for the treatment of substances having fluidity such as powders in addition to liquids and gases.

  As described above, according to the present invention, since the projecting piece to be a resistor is formed by cutting and raising the peripheral wall of the cylindrical body, it can be manufactured by a cutting and bending process, so even a small diameter can be easily manufactured. Can be manufactured with various materials, and can realize a static mixer with a small diameter and high efficiency, which is difficult to manufacture by conventional methods. This makes it possible to manufacture a static mixer with the optimal material.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view showing a static mixer to which the present invention is applied. In this static mixer, a resistor element 2 is arranged inside a cylindrical casing 1, and a plurality of projecting pieces 3a to 3p, which are resistors, are provided in a circular cross section. Are protruded in a tongue shape from the inner peripheral surface of the cylindrical body 4 to the center, and are inclined at a predetermined interval in the axial direction so as not to contact each other while being inclined to the downstream side, and sequentially at a predetermined angle in the peripheral direction. It is provided staggered.

  FIG. 2 is a perspective view showing the resistor element 2 shown in FIG. The projecting pieces 3a to 3p are formed so that two adjacent projecting pieces sequentially form a pair, such as the projecting pieces 3a and 3b and the projecting pieces 3c and 3d from the upstream side, so that they form a generally C shape. Projecting from the mutually opposing inner peripheral surfaces, they are arranged at angular positions facing each other, that is, symmetrical positions about the central axis of the cylindrical body 4.

  Of the projecting pieces 3 a to 3 p that are paired with each other, the first projecting pieces 3 a, 3 c, 3 e, 3 g, 3 i, 3 k, 3 m, 3 o located on the upstream side intersect with the center line of the cylindrical body 4. It is formed in a short length so as not to. The second protrusions 3b, 3d, 3f, 3h, 3j, 3l, 3n, and 3p located on the downstream side are formed to be long so as to intersect the center line of the cylindrical body 4, and the inner front end portion is formed. It overlaps with the front and back.

  The projecting pieces 3a to 3p are formed by cutting up the peripheral wall of the cylindrical body 4, that is, by forming a cut corresponding to the outer contour of the projecting pieces 3a to 3p on the peripheral wall of the cylindrical body 4 and bending the inner side. In particular, here, the projecting pieces 3a to 3p are formed by cutting and raising the peripheral wall portion located on the downstream side with respect to the projecting pieces 3a to 3p, and the cross-sectional shape in the width direction is straight by providing the folds in an arc shape. I am doing. The projecting pieces 3a to 3p may have a configuration in which the cross-sectional shape in the width direction is substantially arc-shaped and the front side facing the flow is convex. The inclination angle of the projecting pieces 3a to 3p with respect to the axis of the cylindrical body 4 may be set as appropriate according to the application, but may be set in the range of 15 degrees to 70 degrees, for example.

  The projecting pieces 3a to 3p are formed in a substantially fan shape that narrows toward the tip side. The projecting pieces 3a to 3p can have various shapes in addition to the substantially fan shape. For example, the projecting pieces 3a to 3p can have a substantially U-shaped outer shape by forming a tip edge in a substantially arc shape. is there.

  FIG. 3 is a front view of the resistor element 2 shown in FIG. 1 as viewed from the upstream side. The projecting pieces 3c and 3d on the downstream side of the projecting pieces 3a and 3b that are paired in a C shape are disposed at positions shifted by 45 degrees in the circumferential direction, and so on. 3e, 3f, projecting pieces 3g, 3h, projecting pieces 3i, 3j, projecting pieces 3k, 3l, projecting pieces 3m, 3n, projecting pieces 3o, 3p are shifted by 45 degrees in the circumferential direction, and the first projecting piece For 3a and 3b, the angular positions are 45 degrees, 90 degrees, 135 degrees, 180 degrees, 225 degrees, 270 degrees, and 315 degrees in the circumferential direction, respectively. Therefore, when viewed as a whole, each of the projecting pieces 3a to 3p that are paired with each other is arranged to draw a spiral with a lead angle corresponding to a predetermined shift angle.

  For this reason, when a fluid (processing object) is introduced into the casing 1, the flow facing the first projecting pieces 3 a and 3 b collides with these projecting pieces 3 a and 3 b and is dispersed around them. A flow that does not face the projecting pieces 3a and 3b collides with any of the projecting pieces 3c to 3p on the downstream side without causing a short path and is dispersed in multiple directions, and such collision and dispersion of the introduced fluid are sequentially repeated. Thus, a strong turbulent flow is generated in the casing 1 and the fluid is vigorously stirred.

  Furthermore, the center line of the cylindrical body 4 is centered on the fluid flowing through the inside by the action of the long second protrusions 3b, 3d, 3f, 3h, 3j, 3l, 3n, and 3p arranged in a spiral. The swirling flow is generated, and stirring is continued even in the downstream pipe where the resistor element 2 is not disposed, and high stirring performance can be obtained.

  FIG. 4 is a perspective view showing a manufacturing procedure of the resistor element 2 shown in FIG. First, as shown in FIG. 4 (A), a cutting line 42 and a folding line 43 corresponding to the outer contours of the projecting pieces 3a to 3p are formed on the peripheral wall of the tubular member 41 to be the cylindrical body 4 using a scribing needle or the like. wear. Next, as shown in FIG. 4B, a cut 44 is formed in the peripheral wall of the tube material 41 along the cutting line 42 using a laser cutting machine or the like. Then, as shown in FIG. 4C, the protruding piece forming portion 45 defined by the cut 44 is bent inward along the folding curve 43, whereby protruding pieces 3 a to 3 p protruding inward from the fold 46 are formed. It is formed.

  As shown in FIG. 1, the resistor element 2 configured in this manner is inserted into the casing 1, and the packing 13 is interposed between the flange 11 provided at both ends of the casing 1 and the fixing ring 12. The stopper 14 interposed with the cylindrical body 4 is fixed to the casing 1 by contacting the end faces on both sides of the cylindrical body 4. The flange 11 and the fixing ring 12 are connected by a bolt (not shown).

  FIG. 5 is a sectional view showing a modification of the resistor element 2 shown in FIG. Here, the reinforcing member 51 is fixed in a range from the back surface of the projecting pieces 3 a to 3 d to the outer peripheral surface of the cylindrical body 4. The reinforcing member 51 is fixed by an appropriate fixing method suitable for the material, such as an adhesive or welding. According to this, when the projecting pieces 3a to 3d which are merely bent on the peripheral wall of the cylindrical body 4 are insufficient in rigidity with respect to the pressure of the fluid, the reinforcing member 51 supports the projecting pieces 3a to 3d from the back surface. The protrusions 3a to 3d can be prevented from being deformed by the pressure of the fluid.

  FIG. 6 is a sectional view showing another example of a static mixer according to the present invention. In this static mixer, the resistor element 61 is provided with a pair of first and second projecting pieces 63a and 63b, which are resistors, inside a cylindrical body 62, and a plurality of resistor elements 61 are provided. Are arranged in the casing 1 side by side in the axial direction of the cylindrical body 62 while being sequentially shifted by a predetermined angle in the circumferential direction of the cylindrical body 62.

  FIG. 7 is a perspective view showing the resistor element 61 shown in FIG. The first and second pair of projecting pieces 63a and 63b project in a tongue shape in a state of being inclined downstream from the mutually opposing inner peripheral surfaces of the cylindrical body 62 so as to form a generally letter C shape. The first protrusion 63 a located on the upstream side is formed in a short length so as not to intersect the center line of the cylindrical body 62, and the second protrusion 63 b located on the downstream side is the center line of the cylindrical body 62. It is formed in a long shape so as to intersect.

  Concavities and convexities are formed on the end of the cylindrical body 62 in the axial direction, and the cylindrical body 62 is joined to the adjacent one by shifting by 45 degrees.

  When the resistor element 61 thus formed is disposed in the casing 1, the resistor element 61 is arranged by being shifted by 45 degrees in the circumferential direction with respect to the immediately preceding resistor element 61. Hereinafter, the subsequent resistor elements 61 are also arranged so as to be shifted in the same direction by 45 degrees with respect to the immediately preceding one, and for the first resistor element 61, 45 degrees, 90 degrees, 135 in the circumferential direction, respectively. The angular position is such as 180 degrees. Therefore, when viewed as a whole, the projecting pieces 63a and 63b paired in a C shape are arranged so as to draw a spiral with a lead angle corresponding to the shift angle of the resistor element 61.

  Therefore, as in the above example, when a fluid is introduced into the casing 1, the flow facing the projecting pieces 63 a and 63 b of the first resistor element 61 collides with these projecting pieces 63 a and 63 b. A flow that is distributed to the periphery and does not face the protrusions 63a and 63b collides with one of the protrusions 63a and 63b of the downstream resistor element 61 without being short-pathed, and is distributed in multiple directions. By repeatedly repeating the collision and dispersion of the introduced fluid, a strong turbulent flow is generated in the casing 1 and the fluid is vigorously stirred.

  FIG. 8 is a perspective view showing a manufacturing procedure of the resistor element 61 shown in FIG. First, as shown in FIG. 8A, unevenness is formed on the side edge portion of the plate member 81 that is the basis of the cylindrical body 62 by pressing or the like. Further, a cutting line 82 and a folding line 83 corresponding to the outer contours of the protruding pieces 63a and 63b are attached to the plate member 81 using a marking needle or the like. Next, as shown in FIG. 8B, a cut 84 is formed in the plate 81 along the cutting line 82 using a laser cutting machine or the like. Then, as shown in FIG. 8C, the protruding piece forming portion 85 defined by the cut 84 is bent inward along the folding line 83, and at the same time, the plate 81 is rolled. As a result, as shown in FIG. 8D, projecting pieces 63a and 63b projecting inward from the fold 86 are formed.

  Here, the side edges 87 and 88 of the plate member 81 that are abutted with each other may be joined to each other by welding or the like, but the casing is formed by the elastic force of the cylindrical body 62 formed by rolling the plate member 81. The cylindrical body 62 can be brought into close contact with the inner peripheral surface of 1 and fixed.

  FIG. 9 is a sectional view showing another example of the resistor element according to the present invention. The resistor element 91 is formed by rounding the plate material from which the cylindrical body 92 is formed, as in the example of FIG. 7, but unlike the above example, the projecting pieces 93a and 93b that are paired with each other, A plurality of sets of protruding pieces 93c and 93d and protruding pieces 93e and 93f are provided, and these are arranged so as to be shifted by 45 degrees in the circumferential direction as in the example of FIG.

  In this configuration, since the cylindrical member 92 is formed by rounding the plate material, the number of protrusions 93a to 93f is limited. However, as in the example of FIG. By arranging them inside the casing 1 in parallel, the required stirring ability can be obtained.

  FIG. 10 is a sectional view showing another example of the resistor element according to the present invention. In the resistor element 101, as in the example of FIG. 2, a plurality of protruding pieces 103a to 103j which are resistors are protruded from the inner peripheral surface of the cylindrical body 102 having a circular cross section. Contrary to the above example, a cut is made in the peripheral wall portion of the cylindrical body 102 located on the upstream side with respect to the protruding pieces 103a to 103j, and the protruding piece forming portion defined by the cut is formed on the downstream side. The projecting pieces 103a to 103j are formed by bending to an inclined predetermined angle.

  In this configuration, the projecting pieces 103a to 103j are bent into a shape in which the cross-sectional shape in the width direction is substantially arc-shaped and the front side facing the flow is concave. If it does in this way, the flow which collided with projection piece 103a-103j can be guided to the front center part of the next projection piece 103a-103j, the collision effect to projection piece 103a-103j can be heightened, and projection piece 103a-. The vortex flow generated on the back side of the protrusions 103a to 103j is increased by the flow dispersed around the periphery of 103j to promote the flow turbulence, and the stirring efficiency can be further enhanced.

  FIG. 11 is a cross-sectional view showing another example of the resistor element according to the present invention. In the resistor element 111, unlike the above-described examples, the cylindrical body 112 has a quadrangular cross-sectional shape, and the pair of side walls 112a and 112b and the side walls 112c. From 112d, the projecting pieces 113a and 113b, the projecting pieces 113c and 113d, the projecting pieces 113e and 113f, and the projecting pieces 113g and 113h that are paired with each other are projected so as to form a substantially C shape.

  This configuration is suitable for the purpose of mixing powder, and convection and shear are generated by the action of the protrusions 113a to 113h in the powder (object to be treated) introduced into the powder without causing clogging. Is efficiently stirred and mixed. Moreover, it is suitable also for the use which conveys powder, and clogging by the bridge | bridging (bridge | crosslinking) which arises in a hopper exit part etc. can be suppressed.

  In addition, the cross-sectional shape of the cylindrical body according to the present invention is not limited to this example, and various polygons are possible, and like the above example, the pair of projecting pieces have a substantially C shape. In addition to the quadrangular shape, for example, an even-angled polygon such as a hexagon or an octagon is possible. If it is not limited to this arrangement mode, for example, an odd-numbered polygon such as a triangle is also possible.

  Further, the resistor element according to the present invention can be disposed inside a heat exchanger tube of a heat exchanger, in addition to being applied to a static mixer only for the purpose of mixing an object to be processed. The temperature distribution of the fluid flowing through the heat transfer tube is made uniform by the stirring effect by the flow, so that the performance of the heat exchanger can be improved and the highly viscous fluid can be used for the heat exchanger.

  The resistor element and the manufacturing method thereof according to the present invention can be easily manufactured with a small diameter, have few effects on the material, and have the effect of being able to be manufactured with an optimal material according to various applications. In addition, it is useful as a static mixer used in applications that mix a small amount of objects to be processed, applications that require low costs for disposable use, and applications that require the production method to be limited. .

It is sectional drawing which shows the static mixer to which this invention was applied. It is a perspective view which shows the resistor element shown in FIG. It is the front view which looked at the resistor element shown in FIG. 1 from the upstream. It is a perspective view which shows the manufacture procedure of the resistor element shown in FIG. It is sectional drawing which shows the modification of the resistor element shown in FIG. It is sectional drawing which shows another example of the static mixer by this invention. FIG. 7 is a perspective view showing the resistor element shown in FIG. 6. It is a perspective view which shows the manufacture procedure of the resistor element shown in FIG. It is sectional drawing which shows another example of the resistor element by this invention. It is sectional drawing which shows another example of the resistor element by this invention. It is sectional drawing which shows another example of the resistor element by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 2 Resistor element 3a-3p Protrusion piece (resistor)
4 Tubular body 41 Tubing material 42 Cutting line 43 Folding curve 44 Cut 45 Projection piece forming portion 46 Crease 51 Reinforcement member 61 Resistor element 62 Tubular bodies 63a and 63b Projection piece (resistor)
81 Plate material 82 Cutting line 83 Folding curve 84 Cut 85 Projection piece forming part 86 Crease 91 Resistor element 92 Cylindrical body 93a-93f Projection piece (resistor)
101 resistor element 102 cylindrical body 103a-103j protrusion (resistor)
111 resistor element 112 cylindrical body 113a-113h protrusion (resistor)

Claims (1)

A cylindrical casing through which the object to be treated can be distributed;
A cylindrical body which is inserted inside the casing,
Cutting and raising the peripheral wall of the cylindrical body, and having a protruding piece as a resistor formed so as to protrude from the inner peripheral surface of the cylindrical body toward the center ,
The protrusion is an inner peripheral surface Rutotomoni provided more by have your predetermined intervals in the axial direction so as not to contact with each other in an inclined downstream, a pair of the protruding pieces are facing each other of the tubular body The pair of projecting pieces are formed so as to be longer than the other so that one of the projecting pieces intersects the center line of the cylindrical body. Multiple sets are arranged side by side,
A stationary mixer, wherein a plate-like reinforcing member is fixed along the back surface of the protruding piece and the outer peripheral surface of the cylindrical body .

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