JP3120851B2 - Manufacturing method of static fluid mixer - Google Patents

Description

The present invention relates to a static fluid mixer for mixing two or more fluids and a method for manufacturing the same, and more specifically, to mixing, dispersion, and the like.
The present invention relates to a static fluid mixer used for obtaining effects such as stirring, heat exchange, reaction, and extraction on two or more kinds of fluids in processes such as emulsification, gas absorption, dilution, and dissolution, and a method for producing the same.

[Prior Art] This type of static fluid mixer is used in the chemical industry, food industry,
In many fields such as pollution control related industries, building and civil engineering industries, electronic industries, and automobile industries, a large number of mixers having no mechanically movable parts for chemical reaction apparatuses and biological reaction apparatuses are used.

As a conventional static type fluid mixer, a plurality of spiral blades are arranged in a hollow cylindrical tube, and a spiral flow is given to the fluid flowing through the passage tube, and at a connection point between the blades. There is a type in which the fluids flowing through passages partitioned by the blades are divided and merged to be mixed.
The conventional static mixer includes a type in which the passage tube and the blade are separately manufactured and assembled by joining the two, and a type in which the channel tube and the blade are integrally formed.

Further, as a combination of fluids to be mixed, there is a combination of liquids, gases and powders, and also a combination of these liquids, gases and powder fluids. In addition, in some cases, three components may be mixed in addition to the two components.

For example, as a use for mixing a liquid and a gas, there is a method for dissolving bentonite powder in water, which is in demand as a means for lubrication and preventing collapse in soil at a civil engineering construction site or the like.

[Problems to be Solved by the Invention] However, the above-mentioned conventional static fluid mixer has a disadvantage that the fluid mixing efficiency is not always sufficient particularly when a large amount of fluid flows. . In addition, in the case of a large size, there is a problem that the manufacturing cost is high.

The present invention has been made in view of such a problem, and even when the flow rate of a fluid is large, it is possible to mix these fluids with high mixing efficiency, and the static fluid mixing is low in manufacturing cost. It is an object of the present invention to provide a vessel and a method for manufacturing the same.

[Means for Solving the Problems] In the method for manufacturing a static fluid mixer according to the present invention, an axial body is coaxially arranged at a center portion of a passage tube, and a passage between the passage tube and the inner surface of the shaft core is formed. A method of manufacturing a static fluid mixer in which a helical blade body is disposed between the shaft body and the inner surface of the passage pipe, and the fluid is guided by the blade body and mixed while the fluid flows. In the step of joining a plurality of blades around the mandrel at equal intervals in the circumferential direction and at a predetermined pitch in the longitudinal direction, and assembling the vane body and the mandrel into the passage pipe Arranging the blade body and the passage pipe with each other, wherein the diameter of the mandrel is 1/5 of the inner diameter of the passage pipe.
It is characterized by the above.

[Operation] In the present invention, the mandrel is disposed coaxially inside the passage pipe, and in the first fluid mixer, a spray nozzle for ejecting a fluid toward the inside of the passage pipe is provided in the passage pipe. is there.

Since the diameter of this mandrel is 1/5 or more of the inner diameter of the passage tube, there is a relatively large area where fluid does not flow in the center of the passage tube. FIG. 1 is a schematic view showing a cross section of a passage pipe. As shown in FIG. 1 (b), in the case of the conventional fluid mixer, a half-circular region of the cross section of the passage tube 1 is a fluid passage, and this region is indicated by an arrow in the figure. Fluid flows as shown. However, since the fluid passage is semicircular, a relatively large vortex region 3b exists at the center thereof. The vortex region 3b is a dead region that is useless for the flow and mixing of the fluid. On the other hand, in the present invention, as shown in FIG. 1 (a), since the mandrel 2 is coaxially arranged at the center of the passage tube 1, the fluid is indicated by arrows in the figure. Flows along a circumferential fluid passage formed between the passage tube 1 and the mandrel 2. Therefore, the swirl region 3a generated in the fluid passage is extremely small, and the fluid flows with high efficiency and is mixed.

In the first fluid mixer, since the spray nozzle is disposed in the passage pipe, the first fluid flowing through the circumferentially extending fluid passage between the passage pipe and the shaft body is provided. , A second fluid is injected and supplied through the spray nozzle. Since the first fluid flowing through this passage is flowing along the pipe wall of the passage tube with high efficiency, the second fluid ejected from the spray nozzle comes into contact with the first fluid at an extremely high contact rate and mixes. Is done.

On the other hand, in the second fluid mixer, the mandrel is formed in a hollow shape, and the fluid flows through the inside of the mandrel. Then, a spray nozzle is provided on the mandrel, and a fluid flowing through the mandrel is jetted from the spray nozzle into the passage pipe, thereby obtaining the same operation as the first fluid mixer. In addition, a filler for improving gas-liquid contact, a filler having a catalytic action, or a static mixer having a structure similar to that of the related art can be provided in the mandrel. This further promotes the reaction or mixing of the fluid.

In order to obtain such an effect, it is necessary to make the diameter d of the mandrel to be 1/5 or more of the inner diameter D of the passage tube. This is because when the diameter d of the mandrel is small, the swirl area becomes large similarly to the conventional fluid mixer, and a useless area is generated in the passage. In particular, when the fluid mixer of the present invention is used as a means for gas-liquid contact, if the diameter of the mandrel is small, the liquid tends to flow on the wall side of the passage tube, and gas-liquid mixing cannot be obtained.

Further, in the method of the present invention, first, the blade body is joined to the mandrel by welding or the like, and then the assembly of the blade body and the mandrel is inserted and arranged in the passage pipe, and Join body and passage tube. In this way, a static fluid mixer can be manufactured very easily.

[Example] Next, an example of the present invention will be described more specifically.

FIG. 3 is a sectional view showing an embodiment of the first fluid mixer of the present invention. This fluid mixer is configured by alternately combining a portion A where the right-handed blade 14a is arranged and a portion B where the left-handed blade 14b is arranged. Passage pipe 11
Is a long pipe, and a long cylindrical shaft core 12 is coaxially arranged inside the passage pipe 11. A pair of blades twisted 90 ° clockwise around the mandrel 12
14a are fixed by arranging them so that the extension lines of their horizontal edges are linear with respect to the mandrel 12. Thereby, the part A is configured. Further, in the part B, instead of the right-handed blade 14a, the left-handed blade 14b which is twisted 90 ° in the counterclockwise direction is similarly formed so that the extension line of the horizontal edge is straight. It is arranged and fixed.

Each of the blades 14a, 14b is, for example, a passage tube 11 and a shaft core 1
After being molded separately from 2, the blades 14a, 14b are joined to the mandrel 12 by welding or the like, and further inserted into the passage tube 11 to join the blades 14a, 14b to the passage tube 11. It is sufficient to assemble by doing.

By the way, the diameter of the mandrel 12 is d, and the inner diameter of the passage tube 11 is D
Then, the sizes of the respective shaft cores 12 and the passage tubes 11 are set so that d / D becomes 1/5 or more.

A plurality of spray nozzles 15 spaced at a predetermined pitch in the longitudinal direction of the passage tube 11
It is arranged toward the center of. Then, a fluid such as water is injected into the passage pipe 11 through the spray nozzle 15.

When the fluid mixer configured as described above is applied to exhaust gas treatment, exhaust gas as a gas and a cleaning liquid as a liquid are mixed using the fluid mixer. First,
Exhaust gas and a cleaning liquid using an acid such as water, hydrochloric acid and sulfuric acid, or an alkali such as sodium dichlorate, caustic soda and ammonia water are supplied into the passage from the head of the fluid mixer to mix the fluid. The parts A and B of the vessel are alternately passed. Then, a liquid such as a cleaning liquid is similarly injected from the spray nozzle 15 into the inside of the passage tube 11. Thereby, the passage pipe of the part A
The fluid flowing through 11 passes through the passage partitioned by the blade body 14a in a right-handed helical shape, and the fluid flowing through each passage at the boundary between the portion A and the portion B is divided, and Merges with the fluid that has passed through the passage. The fluid then flows through portion B in a left-handed helical fashion and undergoes further division and merging at the boundary with portion A. In this way, the fluids (exhaust gas and cleaning liquid) are repeatedly mixed and divided while flowing through the portions A and B. Further, while the fluid (the exhaust gas and the cleaning liquid) flows through the inside of the passage tube 11, the cleaning liquid is ejected from the spray nozzle 15 and mixed and added to the mixture of the exhaust gas and the cleaning liquid.

As described above, since the mandrel 12 is disposed at the center of the passage tube 11, the fluid flows along the tube wall of the passage tube 11,
A vortex is not generated and stays in the passage. Therefore,
The fluid is stirred and mixed with high efficiency.

Further, since the fluid (cleaning liquid) is directly sprayed from the spray nozzle 15 onto the fluid (exhaust gas and cleaning liquid), the spray fluid (cleaning liquid) is a highly efficient mixed fluid (exhaust gas and cleaning liquid).
And mixed.

FIG. 3 is a sectional view showing a second embodiment of the present invention.
This embodiment is different from the first embodiment in that a spacer portion 16 having no blade is disposed between the portion A and the portion B. Thus, by arranging the spacer portion 16 between the portions A and B, the mixing efficiency can be further improved.

FIG. 4 is different from the embodiment of FIG. 3 in that an aperture portion 18 is provided instead of the spacer portion 16. The throttle portion 18 has an effect of gradually reducing the cross-sectional area of the fluid flow formed between the passage pipe 11 and the mandrel 12 in the region of the throttle portion 18 and changing the flow velocity thereof. Thereby, the mixing efficiency of the fluid is further improved.

FIG. 5 is a sectional view showing an embodiment of the second fluid mixer of the present invention. Referring to FIG. 5, a fourth embodiment of the present invention will be described. Fluid mixer parts C and D are passage pipe 2
1 is provided with 90 ° right-handed and 90 ° left-handed blades 24a, 24b, and such portions C and D are alternately arranged. The same is true. This embodiment is different from the first embodiment in that the mandrel 22 has a hollow cylindrical shape. This mandrel 22 is, like the first embodiment,
The outer diameter of the passage tube 21 is relatively large so as to be 1/5 or more of the inner diameter of the passage tube 21, and a fluid flows through the inside of the passage tube 21. A spray nozzle 25 is disposed at the center of the mandrel 22 in the longitudinal direction. The spray nozzle 25 injects a fluid flowing through the inside of the mandrel 22 toward the inside of the passage tube 21.

In the fluid mixer configured as described above, the fluid flowing between the passage pipe 21 and the mandrel 22 is partitioned by the blades 24a and 24b in the passage pipe 21 as in the first embodiment. Fluid flowing in the passage spirally and flowing in the mandrel 22 flows through the passage tube 21.
Is injected toward the fluid flowing through the passage between the shaft core 22 and the fluid, and is added and mixed. Thereby, each fluid can be mixed with high efficiency.

In the present embodiment, instead of providing the spray nozzle 25, a number of small holes are formed in the pipe wall of the shaft body 22, and the small holes are formed by the pressure of the fluid flowing through the shaft body 22. The fluid may be injected into the passage tube 21 through the passage.

FIG. 6 is a sectional view showing a fourth embodiment of the present invention. As shown in FIG. 6, a mandrel 26 such as a platinum catalyst is filled in the mandrel 22, and the inside is It can also be brought into contact with a flowing fluid. If the padding 26 is a platinum catalyst, contact with the fluid allows the mixing of the fluid to proceed in the mixer and vice versa.

In the embodiment shown in FIGS. 5 and 6,
By connecting the space between the passage tube 21 and the mandrel 22 and the space in the mandrel 22, the fluid passes through the space between the passage tube 21 and the mandrel 22 on the outward path, It is possible to pass through the inside of the mandrel 22 on the return path. The reverse is also possible.

Further, a static mixer having the same structure as that of the related art or a static mixer having the same structure as that of the present embodiment may be inserted into the mandrel 22. Thereby, the stirring and mixing path of the fluid can be doubled or more.

Further, in each of the above embodiments, as shown in the plan view of FIG. 7, the blade 14a (or 14b) of the fluid mixer divides the inside of the passage tube 11 into two parts. However, the present invention is not limited to this. For example, as shown in FIG.
The inside may be configured to be divided into three. This gives 3
Individual fluid passages are formed. It is also possible to form four or more fluid passages.

In each of the above-described embodiments, the blade body, the passage tube, and the mandrel are manufactured separately, and then assembled, so that they can be manufactured easily and at low cost.

[Effects of the Invention] According to the present invention, since the mandrel having a predetermined diameter is provided inside the passage tube, even when a large amount of fluid flows,
The mixing efficiency of the fluid can be significantly increased. Also, its manufacturing cost is low.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining the operation of the present invention in comparison with a conventional case, FIG. 2 is a cross-sectional view showing a first embodiment of the present invention,
FIG. 3 is a sectional view showing a second embodiment of the present invention, FIG. 4 is a sectional view showing a third embodiment of the present invention, and FIG. 5 is a sectional view showing a fourth embodiment of the present invention. 6, FIG. 6 is a sectional view showing a fifth embodiment of the present invention, FIG. 7 is a schematic view showing a two-piece blade, and FIG. 8 is a schematic view showing a three-piece blade. 1,11,21; passage pipe, 2,12,22; mandrel, 14a, 14b, 24a, 24b; impeller, 15,25; spray nozzle, 16; spacer

Claims (1)

(57) [Claims] An axial body is coaxially arranged at a central portion of a passage tube, and a helical blade is arranged between the passage tube and an inner surface of the axial core. In a method for manufacturing a static fluid mixer in which a fluid is guided while being guided by the blade body between the inner surface of a passage pipe and a fluid flows, a plurality of blade bodies are circumferentially arranged around a mandrel. And a step of joining at a predetermined pitch in the longitudinal direction, and a step of arranging the assembly including the blade body and the shaft core body in the passage pipe and joining the blade body and the passage pipe. Wherein the diameter of the mandrel is not less than 1/5 of the inner diameter of the passage tube.