JP2011121038A - Static mixer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a static mixer which can obtain good stirring and mixing efficiencies to a high viscosity fluid and also to a low viscosity fluid with a simple constitution. <P>SOLUTION: In the static mixer, a plurality of orifice plates are arranged in cylindrical piping, a plurality of holes are provided in the orifice plate, and holes of the adjacent two orifice plates viewing in an axial direction of the piping are arranged not to overlap. Three or more orifice plates are arranged in the piping, the number of holes in each orifice plate is three or more, and the holes are opened uniformly along the outer periphery of the orifice plate. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a static mixer that mixes fluids. Specifically, the present invention relates to a static mixer having a plurality of orifice plates.

  Static mixers are widely used as fluid agitation / mixing devices. This static mixer is a mixer that does not have a dynamic part and does not have a driving rotary stirring blade, as the name suggests, with respect to a normal stirring / mixing system in which a stirring blade is rotated in a fluid. The static mixer is usually installed in the middle of the fluid flow path and is configured to generate turbulence (turbulent flow such as vortex flow) in the flow of the fluid being transferred to perform stirring and mixing (stirring and mixing energy is obtained from the fluid) Has been.

  Conventionally, the static mixer shown in FIGS. 3 to 5 is used. The static mixer shown in FIG. 3 has a plurality of spirally twisted 90-degree plates placed in series in the pipe, and when the fluid passes through, the division and assembly are repeated, and the flow is disturbed by the torsional motion. The liquids are mixed with each other (for example, Patent Document 1). As a similar product, there is a static mixer that arranges a grid as shown in FIG. 4 and obtains the same effect (for example, Patent Document 2). This is assembled by assembling one type of component part so as to have an orthogonal part with respect to the fluid flow, and is suitable for mixing fluids such as low-viscosity fluids and gases. In addition, there is a static mixer in which a collision plate is placed in a pipe and mixing is performed by sudden change of direction of fluid (for example, Patent Document 3). FIG. 5 shows a static mixer having a structure in which mixing is completed by one collision using a collision plate.

US3286992 Registered practical use 3003581 JP-A-9-299776

However, the static mixer shown in FIG. 3 is originally devised for agitation of a highly viscous fluid, and is configured so that the resistance caused by agitation is minimized. For this reason, the energy required for mixing the fluid is not sufficiently provided. Therefore, there is a problem that the stirring and mixing efficiency is low when the speed of the fluid is low. In order to solve this, it is necessary to increase the number of spiral plates, but the apparatus becomes complicated and the cost increases. The static mixer in which the grid shown in FIG. 4 is arranged has a problem that sufficient stirring and mixing efficiency cannot be obtained for a high viscosity fluid. The static mixer of FIG. 5 also cannot provide sufficient stirring and mixing efficiency for the complicated structure.
An object of the present invention is to provide a static mixer capable of obtaining good stirring / mixing efficiency even with a high viscosity fluid and a low viscosity fluid with a simple configuration.

As a result of earnest research, the present inventors have arranged a plurality of orifice plates having a plurality of holes in the pipe at intervals on the same axis, and the positions of the holes of the adjacent orifice plates are determined. The inventors have found that this can be achieved by avoiding overlapping, and have reached the present invention.
That is, in the present invention, a plurality of orifice plates are arranged in a cylindrical pipe, and the orifice plate is provided with a plurality of holes so that the holes of two adjacent orifice plates do not overlap when viewed in the axial direction of the pipe. It is a static mixer that is arranged.
Furthermore, the present invention is characterized in that three or more orifices are arranged in the pipe, the number of holes in each orifice is three or more, and the holes are evenly formed along the outer periphery of the orifice.
Further, according to the present invention, the number of holes in one orifice plate is four, and the center of the hole in the adjacent orifice plate is deviated from the center of the hole in the front orifice plate by 45 degrees when viewed in the axial direction of the pipe. It is characterized by.

According to the present invention, the plurality of holes of the adjacent orifice plate arranged in the pipe are arranged so as not to overlap with the holes of the previous orifice plate when viewed in the axial direction of the pipe. After being divided and passed and gathered, it collides with the wall of the adjacent orifice plate and disperses. As a result, agitation and mixing are sufficiently performed even when mixing high-viscosity fluids and low-viscosity fluids or mixing fluids with a large mixing ratio that are difficult to mix.
In addition, a static mixer can be obtained with a simple configuration in which an orifice plate having a plurality of holes is arranged in the pipe.

According to the present invention, when there are three or more orifice plates having a plurality of holes in the pipe, the liquid is repeatedly divided / assembled and collided / dispersed with the orifice plate. Will be done. That is, the fluid is divided / assembled, collided / dispersed and mixed in a power that uses the number of orifices as the bottom and the number of orifices as an index. In addition, since there are three or more holes, the fluid is efficiently divided and assembled.
According to the present invention, the number of holes in one orifice plate is four, and when viewed in the axial direction of the pipe, the center of the hole in the adjacent orifice plate is deviated from the center of the hole in the previous orifice plate by 45 degrees. In this case, there is no overlap of holes, and the above-mentioned division / aggregation and collision / dispersion are performed most efficiently, so that stirring / mixing is performed most efficiently.

FIG. 2 is a cross-sectional view of a surface obtained by cutting the static mixer of one embodiment of the present invention along the central axis of a pipe. These are the top views of the orifice plate 2 (a) and the orifice plate 3 (b) in FIG. FIG. 5 is a cross-sectional view of a surface obtained by cutting a static mixer / mixer combined with a conventional spiral plate along the central axis of a pipe. FIG. 6 is a cross-sectional view of a surface obtained by cutting a static mixer combined with a conventional grid along the central axis of a pipe. FIG. 6 is a cross-sectional view of a surface obtained by cutting a static mixer having a conventional impingement plate along a fluid flow direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the following embodiments. Various modifications can be made to the following embodiments within the same and equivalent scope as the present invention.

FIG. 1 shows a cross-sectional view of a surface of a static mixer according to an embodiment of the present invention cut along a central axis of a pipe. FIG. 2 is a plan view of the orifice plate 2 (a) and the orifice plate 3 (b) in FIG.
A total of ten orifice plates 2 and 3 are arranged at equal intervals in the pipe 1. In the orifice plate 2 at the left end, four holes 4 are formed at four locations on the upper, lower, left and right sides in the orifice plate as viewed in the drawing. A shaft 5 for fixing the orifice plates is provided at the center of the orifice plate. The holes 4 are evenly arranged so that a line connecting the centers of the upper and lower holes 4 and a line connecting the centers of the left and right holes 4 intersect at right angles. As shown in FIG. 2B, the two adjacent holes 4 are arranged at an angle of 90 degrees with respect to the center of the orifice plate 2.

The adjacent orifice plate 3 is also provided with four holes 4 and a shaft 5 at the center of the orifice plate 3. Similarly to the orifice plate 2, four holes are equally arranged in the orifice plate 3 at an angle of 90 degrees with respect to the center. However, when viewed in the axial direction of the pipe, the holes 4 of the orifice plate 3 are arranged so as to be shifted by 45 degrees so as not to overlap the holes 4 of the orifice plate 2. In other words, the orifice plate 3 is obtained by rotating the orifice plate 2 by 45 degrees with respect to the center of the orifice plate 3. Therefore, the hole 4 of the orifice plate 2 and the hole 4 of the orifice plate 3 do not overlap.
In FIG. 1, the orifice plate 2 is further arranged on the right side of the orifice plate 3, and the orifice plate 2 and the orifice plate 3 are arranged alternately in this way.

  In FIG. 1, for example, the fluid flows in from the left side of the pipe, is divided into four by the four holes 4 of the orifice plate 2, passes through the holes 4, and the fluid gathers again after passing. As can be seen by comparing FIGS. 2A and 2B, the holes of the orifice plate 3 are displaced by 45 degrees from the holes 4 of the orifice plate 2, so that the collected fluid passes through the holes of the orifice 3 as they are. Instead, it collides with the wall of the orifice plate 3 and disperses. The mixed fluid is further divided by the four holes 4 of the orifice plate 3 and collides with the wall of the orifice plate 2 of the right phosphorus toward the drawing and is dispersed. In this way, the fluid is efficiently agitated and mixed by repeating division / aggregation and collision / dispersion. In the case of the static mixer of FIG. 1, since there are ten orifice plates, mixing by division to the fourth power of 10 and collision / dispersion is performed. Further, since the low viscosity fluid is easily affected by the dispersion, the collision / dispersion in particular improves the efficiency of stirring and mixing of the high viscosity fluid and the low viscosity fluid. As described above, the static mixer of the present invention can efficiently stir and mix a high-viscosity fluid and a low-viscosity fluid.

  Although the length and diameter of the pipe applied in the present invention are not particularly limited, the diameter of the pipe is preferably 15A to 50A (60.5 mm). The effect of this invention is fully exhibited as it is 50 A or less, and mixing and dispersion of the fluid are performed efficiently. When it is 15 A or more, it is practical. The diameter and length of the pipe are determined by the application.

  The number of holes in the orifice plate is a plurality of 2 or more, preferably 3 or more, more preferably 3 to 10, particularly preferably 3 to 5, and most preferably 4. When the number is 3 or more, the fluid is sufficiently divided and assembled, and efficient stirring and mixing can be performed. When it is 10 or less, the strength and economy of the orifice plate are good, and the efficiency of stirring and mixing does not improve even if the number of holes is increased beyond this. When the number is 3 to 5, the efficiency of stirring and mixing is further improved. When it is four, the efficiency of stirring and mixing is the best, and the strength of the orifice plate is also excellent because it is easy to manufacture.

  The shape of the hole is not limited, but is circular from the viewpoint of production and mixing efficiency. The size of the hole is not particularly limited, but is preferably 20 to 25% of the diameter of the pipe. Within this range, it is easy to eliminate the overlap of the holes of the adjacent orifice plates, the fluid collision is performed efficiently, and as a result, the fluid stirring and mixing efficiency is good. Further, it is advantageous from the viewpoint of strength and manufacturing of the orifice plate. The holes in one orifice plate preferably have the same size, and all the orifice plates have the same size from the viewpoint of production and stirring / mixing efficiency. Here, the same size includes almost the same size.

  The area of the holes in the orifice plate is preferably 10 to 25% of the whole. Within this range, it is easy to eliminate the overlap of the holes of the adjacent orifice plates, the fluid collision is performed efficiently, and as a result, the fluid stirring and mixing efficiency is good. Further, it is advantageous from the viewpoint of strength and manufacturing of the orifice.

  In the present invention, the holes of the orifice plate are arranged so that the holes of the two adjacent orifice plates do not overlap when viewed in the axial direction of the pipe. It is preferable that the holes of the plurality of orifice plates are equally spaced little by little. The area where the holes of the two adjacent orifice plates do not overlap in the opening of the hole is 50% or more, preferably 90% or more, and most preferably 100% of the opening of the hole. When the non-overlapping area is 50% or more of the opening of the hole, the fluid is sufficiently collided and dispersed, and the larger the non-overlapping area, the higher the efficiency. When the non-overlapping area is 100% of the opening of the hole, the fluid collision / dispersion is best performed.

The plurality of orifices refers to two or more orifice plates, but preferably three or more, and the upper limit is not particularly limited. If there are two orifice plates, the fluid is divided / assembled twice, and collision / dispersion is performed once. If it is three, the fluid is divided / assembled three times, and collision / dispersion is performed twice. If there are two orifice plates, the fluid is sufficiently stirred and mixed, and if there are three or more orifice plates, the fluid collides and disperses repeatedly, and the fluid mixing state is further improved. For example, in the case of FIG. 1, the orifice plate 2 and the orifice plate 3 are alternately arranged, so that the division / aggregation of the fluid and the collision / dispersion are repeated.
The width of the orifice plate is not limited, but considering the strength of the orifice plate and the efficiency of fluid mixing, 20 to 25% of the diameter of the pipe is preferable.

The interval between the two orifice plates is not particularly limited, but is preferably 20 to 25% of the piping in view of fluid mixing efficiency. Further, if the distance between the two orifice plates is set to this length, the length of the portion of the pipe provided with the orifice plate is shortened. Therefore, the length of the static mixer can be shortened.
The material of the orifice plate is not particularly limited, but metal and plastic can be applied, and are determined in consideration of the type of fluid to be applied, the mixing temperature of the fluid, and the like.

  The orifice is fixed in the pipe, but the fixing method is not particularly limited. For example, it can be fixed to the orifice plate through a shaft or welded to the inside of the pipe.

  Applicable fluid is not limited as long as it has fluidity to flow through the pipe, and it is difficult to mix with high viscosity liquids, high and low viscosity liquids, low viscosity liquids, particle dispersion, etc. Mixing of various fluids.

Example 1
An orifice plate made of PFA (thickness 5 mm, outer diameter 26.5 mm) in which four holes with a hole diameter of 5 mm are evenly drilled along the outer periphery inside a 25 A PFA resin pipe (outer diameter 33.4 mm, inner diameter 26.6 mm) 10) with a gap of 5 mm between the orifice plates, and the holes of the adjacent orifice plates being shifted by 45 degrees. This orifice plate was fixed to a shaft through a hole in the center of the orifice plate. When this pipe is viewed in the axial direction of the pipe, the holes of two adjacent orifice plates do not overlap. Thus, the static mixer of the present invention having an orifice plate occupation length of 95 mm was produced.

(Test Example 1)
To the static mixer prepared in Example 1 above, a blue cationic dye is added and a blue viscosity of 10,000 mPa · s is added at a rate of 3 mL / min. When the liquid of s was allowed to flow in parallel at a speed of 5 L / min, a viscous liquid exhibiting a reddish purple uniform color was obtained.

(Test Example 2)
To the static mixer prepared in Example 1 above, a blue cationic dye is added to give a blue liquid with a viscosity of 10,000 mPa · s at a rate of 30 mL / min, and a red cationic dye is added to give a red viscosity of 10,000. When mPa · s liquid was allowed to flow in parallel at a rate of 50 mL / min, a viscous liquid exhibiting a purple uniform color was obtained.

(Test Example 3)
When a pure water was flowed in parallel at a rate of 5 L / min and a hydrogen peroxide solution of 35% concentration at a rate of 10 mL / min through the static mixer produced in Example 1 above, good mixing results were obtained. It was.

  The static mixer of the present invention can be suitably used for mixing a plurality of fluids of a high-viscosity fluid and a low-viscosity fluid, and for mixing a fluid having a large mixing ratio and difficult to mix.

1 Piping 2 Orifice plate 3 Orifice plate 4 Hole 5 Shaft 6 Shaft through hole

Claims (3)

  A plurality of orifice plates are arranged in a cylindrical pipe, a plurality of holes are provided in the orifice plate, and the holes of two adjacent orifice plates are arranged so as not to overlap when viewed in the axial direction of the pipe. mixer.   3. The static according to claim 1, wherein three or more orifices are arranged in the pipe, and the number of holes in each orifice is three or more, and the holes are evenly opened along the outer periphery of the orifice. mixer.   The number of holes in one orifice plate is four, and when viewed in the axial direction of the pipe, the center of the hole in the adjacent orifice plate is deviated from the center of the hole in the previous orifice plate by 45 degrees. Item 3. The static mixer according to item 2.

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