JPH02277533A - Mixing device - Google Patents

Abstract

PURPOSE:To improve the mixing efficiency by forming the mixing element of a corrugated wire material or a corrugated plate material which is wound into a plain plate shape. CONSTITUTION:The fluid to be mixed is flowed into a casing 2 from an influent port 2A and flowed out from a lower effluent port 2B after passed through numerous mixing elements 3. The liquid passed through one passage 5 of the uppermost mixing element 3 is halved by the wire material 4 of the next lower mixing element 3. In the second mixing element 3, the fluid flowed out from two passage 5 of the uppermost mixing element 3 is flowed into one passage 5 to be mixed, and then the liquid passed through the passage 5 is halved again by the wire material 4 of the next lower mixing element 3. Similarly, the liquid is repeated with mixing and dividing so that the mixing the efficiently carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluid mixing device, and particularly to a mixing device suitable for mixing high viscosity fluids such as molten polymers.

[Conventional technology]

In general, most fluid mixing devices use a rotating body such as an IT stirring blade or a ribbon screw to stir the fluid.
A type of mixing device that does not use such a rotating body at all is also known, and one example is a static mixer.

This static mixer consists of a plurality of rectangular plate elements twisted approximately 180 degrees arranged in series in a cylindrical tube with a phase difference of 90 degrees from each other, and the fluid flowing inside the tube Each time it passes through, it is divided into two parts and mixed by being twisted. Therefore, using n elements,
The final number of fluid divisions (mixing ratio) S is: S=2'
Therefore, by increasing the number of elements n, mixing is dramatically improved.

[Problem to be solved by the invention]

However, in conventional static mixers, the fluid is twisted using elements that are shaped like rectangular plates twisted 180 degrees, so the length of the elements cannot be made very small, so if the number of elements is increased.

For example, there was a problem that the total length was extremely long.

In a static mixer, the ratio of the element length L to the pipe inner diameter, L/D, is usually selected to be about 1.5, so if the pipe inner diameter is 3ON, the total length will be 901 for 5 elements (n-20). Moreover, when the number of elements is n-30, the total length becomes 135 cm.

The present invention aims to solve such problems, and provides a static mixer-type mixing device that can dramatically increase the number of fluid divisions S and perform good mixing without increasing the overall length too much. The purpose is to provide.

[Means to solve the problem]

The first invention of the present application was made to achieve the above object.

It has a plurality of flat mixing elements stacked in the direction of passage of the fluid to be mixed, and each mixing element is composed of a wave-curved wire or plate wound into a flat plate in a plane parallel to the curved direction. The gist is a mixing device characterized by:

In addition, the second invention of the present application has a flat mixing element arranged to allow the fluid to be mixed to pass in the radial direction, and the mixing element is configured to move the wire or plate material curved in a wavy manner in the direction of the curvature. The gist of the mixed via is that it is formed by winding into a flat plate in a plane perpendicular to the above.

Hereinafter, the present invention will be explained in more detail with reference to embodiments shown in the drawings.

〔Example〕

FIG. 1 is a schematic sectional view showing a mixing device according to an embodiment of the first invention of the present application. A mixing device, designated as a whole by reference numeral 1, is constructed by stacking a plurality of flat mixing elements 3 in a casing 2 in the direction of passage of fluids to be mixed.

This mixing element 3 is made by winding a wire or plate material (hereinafter simply referred to as a wire rod) 4 curved in a wavy manner as shown in FIG. When viewed from above, as shown in FIG. 3, an undefeated passage 5 is formed between adjacent wavy wire rods 4 passing through the mixing element 3 in the thickness direction. has been done. Therefore.

A large number of small passages are formed over the entire surface of the mixing element 3, and the overall aperture ratio is large. The wire rod 4 used here may have a circular cross section, but if a flat wire rod is used as in the illustrated embodiment, the aperture ratio of the mixing element 3 can be increased (which is preferable). The material constituting 4 is not particularly limited, and may be any metal, plastic, etc., especially if strength is required.

It is preferable to use spring steel or the like.

The mixing element 3 is constructed by winding the wire rod 4 as described above, but simply winding the wire rod 4 lacks strength and may be inconvenient to handle or unable to withstand fluid pressure. In that case, the contact portions of adjacent wire rods 4 may be bonded using an appropriate method, such as adhesive or welding.

It is preferable to increase the strength by joining by brazing, sintering, etc. In this case, it is not necessary to join all the contact parts in the mixing element 3, but it is preferable to join many contact parts by force, and as a joining method, sintering is preferable. After rolling it into a plate shape, by sintering it, a large number of contact parts can be joined, and the strength of the obtained mixing element 3 can be greatly increased. Furthermore, after sintering, as shown in an enlarged view in FIG.
, 4 is filled in the minute gap that existed in the contact area. Therefore, when fluid is passed through this mixing element 3, there are no minute gaps where fluid (particularly high viscosity fluid) tends to stay, and local retention of fluid is prevented. This is a great advantage when the mixing element 3 is used with molten polymers where stagnation is a particular problem.

A large number of mixing elements 3 having the shape shown in FIG.
As shown in the figure, they are stacked and housed in the casing 2. At this time, by randomly stacking the mixing elements 3, as shown in FIGS. 6 and 7.

Most of the wire rods 4 of each mixing element 3 are shifted from the wire rods 4 of the mixing elements 3 above and below it.

Next, a mixing operation by the mixing device 1 having the above configuration will be explained.

In FIG. 1, the fluid to be mixed flows into the casing 2 from the inlet 2A as shown by the arrow, passes through a large number of stacked mixing elements 3, and then flows through the lower outlet 2B.
flows out from. Mixing is performed when this fluid passes through a large number of stacked mixing elements 3. That is, as shown in FIG. 7, the fluid that first passes through one passage 5 of the mixing element 3 on the uppermost stage is divided into two by the wire rod 4 of the mixing element 3 below, and becomes secondary.

In the second mixing element 3, the fluid from the two passages 5 of the uppermost mixing element 3 flows into the two passages 5 and is mixed, and the fluid that passes through the passage 5 is then transferred to the mixing element 3 below. It is further divided into two parts by the wire rod 4. Thereafter, the mixing of the fluid into 5 divisions is repeated in the same manner.
In the end, mixing is performed in a manner similar to that of a conventional static mixer. Therefore, the number of divisions (mixing ratio) S after the fluid passes through the n stages of mixing elements 3 is:

S=2'.

Here, the size of one passage 5 is determined as quadratic.

That is, if the two passages 5 are too small, that passage 5 may be crushed by the wires of the mixing elements 3 located above and below, which is undesirable.On the other hand, if the passage 5 is too large, one passage 5 of the mixing element Within the mixing element, the fluids flowing in from the two passages 5 of the mixing element above do not mix very well, resulting in poor mixing efficiency. The size of the two passages 5 is selected in consideration of these points.

The fourth line (line of mixing element 3) functions to divide the fluid, but it does not need to twist the fluid like the elements of conventional static mixers, so there is no need to increase its width (thickness of mixing element 3). It can be extremely small as long as it has the necessary strength. Therefore, the thickness of the mixing element 3 formed of the wire rod 4 may be extremely thin, and therefore, the height of the mixing device in which the mixing elements 3 are stacked can be rolled up and lowered.

For example, a mixing element 3 using a flat wire 4 with a width of 2 tm and a thickness of 0.5 fi has a thickness of 21, so even if the number n of mixing elements 3 is 30, the height of the stack of mixing elements 3 is , only 6 cll, much shorter than traditional static mixers. Additionally, as the fluid passage length becomes shorter, fluid resistance becomes smaller.

The pressure loss due to the mixing element 3 can be reduced. Furthermore, it is possible to stack far more mixing elements 3 than in conventional static mixers, and good mixing can be achieved.

Note that the mixing element 3 described above divides the fluid using a large number of wire rods 4, but if there are coagulates, il aggregates, etc. in the fluid, these coagulates, aggregates, etc. are cut by the wire rods 4. , in some cases it can be subdivided. In this case, it is preferable to use a thin and flat wire rod 4 for cutting the coagulates, aggregates, etc. In addition, if there is a possibility that coagulates, aggregates, etc. cut by the wire rod 4 may meet and recombine after passing through the wire rod 4, the width of the wire rod 4 (thickness of the mixing element)
It is more effective to make it as large as possible.

In the present invention, in order to allow the fluid to flow through the mixing element 3 evenly, it is preferable that the passage 5 formed in the mixing element 3 has a uniform force. By the way, when the wavy wire 4 is simply wound, depending on the winding method, the vertices of the wire 4.4 may come into contact with each other to form a large passage 5, as shown in FIG. 8A, and as shown in FIG. 8B. As shown in FIG. 2, the wire rods 4.4 may overlap and there may be a portion where only a small passage 5 is formed between the &'i wires. It is desirable to avoid scratching force in the structure shown in Figure 8B, so when winding the wire,
In areas where the wire rods 4 may overlap, care must be taken such as not wrapping the wires too tightly or inserting an appropriate spacer between the wire rods 4.

Also, to prevent the structure shown in FIG. 8B from occurring.

It is also effective to form the waveform on the wire 4 with a non-uniform pinch or height. When wire rods with non-uniform waveforms are wound, since the waveforms of adjacent wire rods are not the same, they will not overlap as shown in FIG. 8B. Furthermore, the mixing element 3 is not limited to the case where it is made only from the wavy wire material 4, but may be made by winding the wavy wire material 4 and the straight wire material 7 at the same time, as shown in FIG. 9. , when a wavy wire 4 and a straight wire 7 are used.

Advantageously, relatively uniform passages 5 can be formed throughout the mixing element.

In the embodiment shown in FIG. 1, a large number of the same mixing elements 3 are stacked, but the stacked mixing elements 3 are not necessarily the same. It is also possible to have a structure in which two types of mixing elements with different types (e.g.) are stacked alternately, or when different types of mixing elements are stacked.

The wire rods of the upper and lower mixing elements rarely overlap, so that the fluid that has passed through the passage of one mixing element is reliably divided by the wire rods of the mixing element below, resulting in good mixing. In this case, in order to prevent an increase in pressure loss, it is preferable to reduce the thickness of the wire forming the small waves.

Although the mixing device of the present invention can be used with any fluid, it is particularly preferred for mixing high viscosity fluids such as molten polymers. The inner diameter of the casing 2 is not particularly limited, and may be appropriately designed depending on the type of fluid used, flow rate, etc. 1 For example, it can range from a small diameter of about 10 mm to a large diameter of several meters. . In addition, the thickness of the wire used for the mixing element 3 is 1 width, and the height of the waveform.

The pitch etc. may be determined as appropriate depending on the type of fluid used, the outer diameter of the mixing element, etc. For example, when used for mixing molten polymer in the synthetic fiber manufacturing process,
The outer diameter of the mixing element 3 is preferably about 20 to 500 fi. In addition, for a mixing element with an outer diameter of about 501 mm, the size of the wire rod 4 used is 1. If a flat wire rod 4 is used as shown in the figure, the thickness is 0.2 to 1.0 mm.
0. The width is 0.4~3. When using a circular cross section, the diameter is preferably about 0.2 to 1 and Q m*. The waveform formed on the wire 4 preferably has a wave height (height from trough to peak) of 0.4 to 2.0 m and a pitch of about 0.5 to 2.0. For a mixing element outer diameter of about 3001 mm, the thickness of the wire rod 4 is 0.2 to 5 mm.
．． 0 crane 1 width is 0.4~20.0■1. Wave height 0.4~
10 dragons, pinch 0°5~20. On level is preferable.

Of course, it goes without saying that values outside this range may be used.

In the embodiment shown in FIG. 1, a mixing device 1 is constructed by stacking a mixing element 3 made of a wavy wire in a casing 2 having small-diameter openings 2A and 2B at the top and bottom. The shape is not limited to this and can be changed in various ways.
An ordinary tube may be used as the casing, ie the mixing device can be constructed by stacking a large number of mixing elements 3 inside the tube.

Furthermore, the mixing device of the present invention does not have to be composed only of the mixing element 3 made of a wavy wire, and can be combined with other elements. In addition, other devices (
For example, it is also possible to incorporate it into a filtration device 3-cap pack, etc.).

These examples will be described below.

FIG. 10 shows an embodiment in which the present invention is combined with a conventional static mixer. The mixing device 1) of this embodiment includes a plurality of mixing elements 1 in a casing 12.
3 and twisted vane-like elements 14 are stacked in the direction of passage of the fluid to be mixed. The mixing element 13 used here has the same structure as the mixing element 3 used in the embodiment shown in FIG. By doing so, it is possible to mix 2it bodies. Further, the zero-blade-shaped element 14 is similar to the element used in a conventional static mixer, and can twist the fluid passing through it by a large amount (180 degrees in the example). By intervening, it is possible to greatly twist the fluid flowing inside the casing 12 and achieve lateral mixing. Thus, by mixing the mixing element 13 and the element 14, good mixing can be achieved.

Figure 1) shows an embodiment in which the mixing device of the present invention is incorporated into a spindle bag in a melt spinning device.

The mouthpiece puncture, which is generally designated by the reference numeral 21, includes a puncture case 22, a metal plate 23, and a pressure support 24.

A plurality of mixing elements 25 stacked on this pressure support 24 and a filter medium 26 provided on the mixing element 25
, an adapter 27, etc. Mixing element 25
The same mixing element 3 as used in the embodiment shown in FIG. 1 is used. Note that the filter medium 26 is not particularly limited, but usually includes a wire mesh 26a, sand 2
6b, a sintered metal fiber filter 26C, and the like are used. In this base back 21.

The molten polymer enters through the adapter 27 and is mixed while passing through the laminated mixing element 25 after foreign substances are removed by the filter medium 26 and passes through the pressure support 24 to the base plate 2.
It is spun from 3. Therefore, since not only filtration but also mixing is performed within the single metal pack 21, extremely high quality yarn can be produced. Furthermore, in this embodiment, the mixing element 25 is configured to support the sintered metal fiber filter 26C. In general, the strength of the sintered metal fiber filter 26c is low, so if it is supported by a support plate with large openings, the filter will deform at the openings and open, which is undesirable. Sintered metal fiber filter 26 with mixing element 25 having countless passages
c, the entire surface of the sintered metal fiber filter is supported relatively evenly.

This also provides the advantage of preventing deformation and preventing poor filtration.

Figure 12 shows 5) Punk cap 2 which is a modification of the embodiment shown in Figure 1).
1' is shown. This mouthpiece pack 21' has a configuration in which the pressure support body is omitted and the filter medium 26 is supported only by a large number of mixing elements 25. in this case.

It goes without saying that the mixing element 25 has the strength to support the filter medium 26.

FIG. 13 shows an embodiment with a function for suppressing the velocity of fluid flowing through the center. This mixing device 31
In this example, a large number of mixing elements 33 having a large opening in the center are stacked in a casing 32, and a cone member 34 is further arranged in the center. This mixing element 33 also has the same structure as the mixing element 33 described in the embodiment of FIG. 1, except that it has an opening in the center. The cone member 34 has a hollow structure with a closed upper end and an open lower end, and has a small through hole 35 on its outer periphery. In the mixing device 31 having this configuration.

Of the fluids flowing from above, those at the outer periphery pass through the mixing element 33 and are mixed. On the other hand, the one in the center is connected to the central opening of the mixing element 33 and the cone member 3.
4, part of it gradually flows inside the mixing element 33 (in the direction of the outer circumference) as shown by arrow a, and part of it enters the inside of the cone member 34 and flows downward. flows to As a result, a portion of the fluid in the central portion is mixed with the fluid in the outer peripheral portion, and the flow velocity in the central portion is suppressed.

Generally, the flow rate of fluid flowing inside a pipe or casing is faster in the center, but by providing this cone member 34, the flow rate in the center is suppressed, the flow rate is relatively uniform throughout, and the piston flow is reduced. It can be realized. Such a piston flow is highly favorable for molten polymers where thermal history has an important influence on quality.

Note that this embodiment allows the fluid in the center to gradually flow toward the outer circumference, but in order to ensure this flow toward the outer circumference, it is necessary to It is necessary to prevent the wires from overlapping as much as possible. For this purpose, it is preferable to vary the heights of the waveforms of the wires forming the mixing element 33 in contact with rJ4.

In particular, when the mixing element 33 is composed of a wavy wire 4 and a straight wire 7 as shown in FIG.
If they overlap vertically, the flow of fluid in the radial direction will be blocked, so it is preferable to make the heights of the corrugations of the wires constituting adjacent mixing elements 33 different and to shift the position of the straight wires 7. .

It is also effective to incline the wire rods constituting the mixing element 33 so that the lower side is radially outward. The angle is preferably 10 to 30 degrees.

Mixing element 33 and cone member 34 shown in FIG.
The combination can be incorporated into the mixing device 1) shown in FIG. 10, or into the mouthpiece puncture 21, 21' shown in FIGS. 1) and 12.

Particularly, it is preferable to incorporate it into a two-die bank because the piston flow properties within the one-die metal pack can be improved and the thermal history of the polymer spun from the two-die metal plate 23 can be made uniform.

In addition, the mixed elmmen explained in 1 or more) 3, 13.25.
33 etc. has the effect of uniformly transmitting the temperature of the outer periphery to the center. Especially when it is sintered, the heat transfer effect increases.

It is therefore also possible to use this mixing element as a heat conducting member.

FIG. 14 shows an embodiment of the second invention of the present application.

The mixing device, designated as a whole by the reference numeral 41, has a casing 42
, a conduit 43 provided in the casing 42 and having a large number of through holes 43 a on its outer peripheral surface, and a flat mixing element 44 stacked on the outer periphery of the conduit 43 .

and a partition plate 45 arranged between each mixing element 44.

an end plate 46 disposed on top mixing element 44; and mixing element 44. Partition plate 45. It is provided with a nand 47 and the like for tightening and fixing the end plate 46 and the like.

Here, the mixing element 44 has an outer diameter equal to that of the casing 4.
2, so that the fluid in the casing 42 flows from the outer periphery of the mixing element 44 into the mixing element 44, passes radially inwardly through the mixing element 44, and flows into the conduit 43. can flow inside. As shown in FIG. 16, this mixing element 44 is made by winding a wave-curved wire or plate material (hereinafter simply referred to as a wire material) 49 into a flat plate shape within a plane perpendicular to the curved direction to form a disk shape. It is composed of Therefore, when the state in which temporary partitions 45 are placed above and below this mixing element 44 is viewed from the outside in the radial direction, as shown in FIG. A large number of communicating passages 50 are formed, and the positions of the passages 50 are different from the passages formed by the wire rod 49 wound inside the passages 50. In other words, the mixing element 44 is constructed by winding a wavy wire in many layers, but the positions of the peaks and valleys of the radially adjacent wires 49 and 49 are shifted from each other, and therefore, as shown in FIG. 2 as shown
A passage 50 formed by cotton materials 49 located on one circumference is crossed by wire materials 49 located inside and outside the passage 50.

According to the mixing device 41 having the above configuration, the fluid to be mixed flows from the opening 42A of the casing 42 as shown by the arrow.
It flows into the casing 42 , flows radially inwardly through the mixing elements 44 from the outer periphery of each mixing element 44 , and exits through the central conduit 43 . When the fluid flows through this mixing element 44, the fluid flows as shown by the arrows in FIG. 17 between the wire rods 49, and the wire rods 49, which are wound many times, repeatedly divide into three parts and merge, thereby achieving uniform mixing. be exposed.

The wire rod 49 used in this embodiment may also be a wire with a circular cross section, but it is preferable to use a flat wire rod as in the illustrated embodiment, since the aperture ratio of the mixing element can be increased. What is the material that makes up the wire rod 49?

It is not particularly limited and may be made of metal, plastic, etc., but if particularly strong strength is required, it is preferable to use spring steel or the like. In addition, if simply winding the wire rods 49 is insufficient in strength and is inconvenient to handle, the contact portions of the adjacent wire rods 49 may be bonded using an appropriate method such as adhesive, welding, brazing, sintering, etc. It is preferable to increase the strength by bonding. Further, in the above embodiment, the mixing element 44 is laminated with the partition plates 45 sandwiched between the upper and lower sides of the mixing element 44, but the partition plates 45 are previously attached to the upper and lower sides of the mixing element 44, or on one side thereof, by an appropriate method, for example, by welding. , brazing, etc. may be used to secure it.

Although the embodiments described above all used disc-shaped mixing elements, the mixing element used in the present invention is not necessarily circular, and may be a wire wound into a shape other than a circle, such as a rectangular shape. It's okay.

〔Effect of the invention〕

As explained above, in the first invention of the present application, a plurality of mixing elements each formed by winding a nine-wavy wire or plate into a flat plate are laminated in the flow direction of the i-body, so that the fluid can be mixed with each Divide into one when passing through an element.

The merging and splitting is performed numerous times, even though it is much smaller than traditional static mixers.

It has the effect that merging can be performed and the mixing efficiency is extremely high. Moreover, as a result of being able to shorten the passage length of the fluid, the pressure loss due to passage of the fluid is small, making it extremely suitable for mixing high viscosity fluids such as molten polymers.

In addition, the second invention of the present application is configured to allow the fluid to pass in the radial direction through the mixing element which is formed by winding a wavy wire or plate material into a flat plate shape, so that the fluid flows in the radial direction of the mixing element. One division, one merging is performed when passing through wires or plates adjacent in the direction, and even with a small diameter mixing element, the number of turns of the wire or plate is large.
Although it is small in size and can perform division and two-merging operations many times, it has the effect of extremely high mixing efficiency. And +i? Since the passage length of the L-body can be shortened, pressure loss due to fluid passage is small, and it is extremely suitable for mixing high viscosity fluids such as molten polymers.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing a mixing device according to an embodiment of the first invention of the present application, Fig. 2 is a schematic perspective view of a mixing element used in the mixing device, and Fig. 3 is a partially enlarged view. A plan view, FIG. 4 is a schematic perspective view showing the wire rod used in the mixing element, FIG. 5 is a schematic plan view showing an enlarged part of the mixing element after sintering, and FIG. FIG. 7 is a schematic cross-sectional view showing a state in which fluid passes through multiple stages of mixing elements; FIGS. 8A and 8B are wire rods in the mixing elements, respectively. FIG. 9 is a schematic plan view illustrating a state of making a mixing element different from the above embodiment, and FIG. 10 is a schematic cross section showing another embodiment of the first invention of the present application. figure. Figures 1) and 12 are schematic cross-sectional views showing an embodiment in which the invention of the present invention is applied to a base bank, and Figure 13 is a schematic cross-sectional view of still another embodiment of the first invention of the present application. FIG. 14 is a schematic sectional view showing a mixing device according to an embodiment of the second invention of the present application, FIG. 15 is a side view of the mixing element and partition plate of the embodiment of FIG. 14, viewed from the outer circumferential side, and FIG. 14th
FIG. 17 is a perspective view schematically showing a mixing element used in the illustrated embodiment, and FIG. 17 is a sectional view taken along the line A-A in FIG. 14. 1-Mixing device, 2-Casing, 3-Mixing element, 4-Wire, 5-Passage, 1)-Mixing device, 12-
- Casing, 13-. Mixing element, 14-. Feather-shaped element, 21-. Cap pack, 22-.. Cap case. 23 - Mouth plate 24 - Pressure support body, 25 - Mixing element, 26 - Filter medium, 27 - Adapter, 41 -
Mixing device, 42--Casing, 43--Conduit, 44
--Mixing element 45-Partition plate, 49--Wire rod, 50--Passway. Agent Patent Attorney Kyo Matsu 313-...:/Return 3chi ≧ [1 time plate ± 13 figures

Claims (2)

[Claims] (1) It has a plurality of flat mixing elements stacked in the direction of passage of the fluid to be mixed, and each mixing element forms a wave-curved wire or plate into a flat plate in a plane parallel to the curved direction. A mixing device characterized by being configured in a rolled manner. (2) It has a flat mixing element arranged to allow the fluid to be mixed to pass in the radial direction, and the mixing element moves the wavy curved wire or plate in a plane perpendicular to the direction of the curvature. A mixing device characterized in that it is configured by being rolled into a flat plate.