JP2000254470A - Mixing/agitation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixing/agitation device which is capable of sufficiently mixing a first liquid and a second liquid with each other even when the ratio of the first liquid to the second liquid is changed, and also capable of easily corresponding to any change in properties of such mixing stocks and further, for which no cleaning liquid is required when cleaning of the device is performed. SOLUTION: This device is provided with: a compressed air introduction port 11 for introducing compressed air; a first liquid introduction port 16 for introducing a first liquid; a second liquid introduction port 25 for introducing a second liquid; a primary atomizing orifice 17 for allowing air introduced from the compressed air introduction port 11 to flow into the orifice 17 and thereafter to jet out from the orifice 17 together with dropletlike-atomized liquid matter formed in the air; a secondary atomizing orifice 26 for allowing this dropletlike- atomized liquid-containing gas-liquid mixed fluid jetted from the primary atomizing orifice 17 to flow into the orifice 26, thereafter further atomizing the mixed fluid and jetting the resulting dropletlike-atomized liquid-containing gas-liquid mixed fluid from the orifice 26; and a nozzle 4 for delivering a dropletlike-atomized two liquid-containing gas-liquid mixed fluid formed by mixing the dropletlike-atomized liquid-containing gas-liquid mixed fluid jetted from the orifice 26 with a second liquid introduced from the second liquid introduction port 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing and stirring device.

[0002]

2. Description of the Related Art Conventionally, tunnel construction (for example, NA
TM, TBM, tunnel construction with shield machine), cement-based mortar, air mortar, water glass-based material, urethane, etc. are used as materials for various construction methods for ground stabilization, rock compaction, cavity filling, etc. Used.
When mortar or the like is used, the mixing and stirring are performed by a mechanical stirring mixer, and the mixture kneaded with the mixer is injected by a pump. When a water glass-based material, urethane, or the like is used, the mixing and stirring are performed by a static mixer, and the mixing and stirring are performed in combination with air blowing or the like. Usually, the mechanical stirring mixer is used for high viscosity materials with poor fluidity or when importance is placed on ensuring mixing performance over workability. Static mixers, which are excellent in portability and operability in terms of surface, are advantageous and are widely used.

[0003]

However, in the case of a static mixer, its shape is fixed, and the condition range of mixing performance for each type unit is narrow. Therefore, when the ratio between the first liquid and the second liquid is large, the liquid cannot be sufficiently mixed because the liquid is susceptible to a change in temperature or a change in fluid viscosity, and there is no function of adjusting the degree of mixing other than increasing or decreasing the flow rate (flow velocity). There are restrictions on things. These restrictions are practical weaknesses, and lead to disadvantages in quality control (guarantee). In addition, when changing material properties (mixing ratio, viscosity), materials, etc., it is necessary to select a model from among many candidate models, that is, to study the optimum conditions each time, which is complicated and time consuming. Cost. Moreover,
In the case of a static mixer, there are complications regarding cleaning when used repeatedly. That is, the static mixer requires a considerable amount of cleaning liquid in spite of its unit structure, and waste liquid treatment is indispensable. In particular, in the case of using for reaction / curing type chemical liquid mixing, there is added a time constraint that a solvent system having high detergency is used to protect not only the piping but also the mixer section itself, and that it must be quickly carried out. Also, including the cleaning circuit, the whole system becomes larger and larger.

The present invention has been made in view of such circumstances, and can be mixed even if the ratio of the first liquid and the second liquid changes, and can easily cope with a change in material characteristics and the like. It is an object of the present invention to provide a mixing and stirring device that has the advantage that a cleaning liquid is not required for cleaning.

[0005]

In order to achieve the above object, a mixing and stirring device according to the present invention comprises a first liquid inlet for introducing a first liquid, a second liquid inlet for introducing a second liquid, and A compressive fluid inlet for introducing a compressive fluid, a first orifice that drops the compressive fluid introduced from the compressive fluid inlet and then flows out, and a drop that flows out of the first orifice. A second orifice into which a gasified gas-liquid mixed fluid flows and then drops and flows out; and a liquid-droplet gas-liquid mixture which flows the first liquid introduced from the first liquid inlet through the first orifice. A first liquid inflow passage for flowing into the second liquid inlet, a second liquid inflow passage for allowing the second liquid introduced from the second liquid introduction port to flow into the dropletized gas-liquid mixed fluid flowing out from the second orifice, and the second liquid inflow passage. The second liquid inflow path into the dropletized gas-liquid mixed fluid from the orifice A configuration that includes a discharge device for discharging a two-liquid mixed dropwise fluids obtained by mixing the second solution al.

That is, in the mixing and stirring apparatus of the present invention, after the compressible fluid introduced from the compressible fluid inlet is caused to flow, the mixture is formed into droplets (in the present invention, the term “droplet” includes the atomization). The first orifice that flows out of the first orifice and the second orifice that flows out of the liquid-droplet gas-liquid mixed fluid that flows out of the first orifice and then further drops and flows out. Have. Then, first, a larger amount (that is, a higher mixture ratio) is prepared as a first liquid, and a smaller amount (that is, a lower mixture ratio) is prepared as a second liquid. Next, the first liquid introduced from the first liquid introduction port is caused to flow into the dropletized gas-liquid mixed fluid flowing out of the first orifice to mix them. Next, by flowing this into the second orifice and then making it drop-like and then flowing it out, the degree of mixing between the first liquid and the compressible fluid is improved, and the droplets obtained by mixing this first liquid are mixed. The second liquid introduced from the second liquid introduction port is caused to flow into the liquefied gas-liquid mixed fluid to mix them. Next, the two-liquid mixed dropletized fluid is passed through the discharge tool, and the turbulence generated in the discharge tool causes
After the two liquids and the dropletized gas-liquid mixed fluid are further mixed, the mixture is discharged from the discharge tool.

As described above, the mixing and stirring device of the present invention is not a structure using a mechanical stirring mechanism like a mechanical stirring mixer or a static mixer, but a structure using fluid engineering (that is, using a compressible fluid). And a turbulent agitation theory based on the Bernoulli theorem and a Reynolds rule), and the two liquids can be efficiently mixed and agitated with a simple structure. Further, as compared with a mechanical stirring type mixer or a static mixer, it is possible to cope with changes in material characteristics (mixing ratio, viscosity, etc.), materials and the like by simple adjustment. That is,
This corresponds to the hole diameters of the two orifices, the gap between the first orifice and the first liquid inflow path, the gap between the second orifice and the second liquid inflow path, and the conditions for the inlet of the compressible fluid to the compressible fluid inlet. (Pressure, flow rate, etc.) can be adjusted and the quality control (guaranteed) is stable. In addition, by introducing a compressive fluid from each inlet at the time of cleaning, blow cleaning can be performed, a cleaning liquid is not required, and a system including a cleaning circuit is hardly increased in size. Therefore, it is environmentally friendly and suitable for outdoor construction. In addition, the above-mentioned cleaning enables repeated use. In addition, by selecting the material, light weight and compactness can be maximized, and portability,
Excellent operability. Further, since the first liquid is passed through the two orifices together with the compressible fluid, a material having a large mixing ratio (a material having a large flow rate) or a material having a high viscosity is selected as the first liquid. Efficient atomization becomes possible.

In the present invention, when the inner diameter of the fluid passage of the discharge device is set to be larger than the inner diameter of the second liquid inflow passage at the connection portion between the second liquid inflow passage and the fluid passage of the discharge device. When the second liquid that has passed through the second liquid inflow path flows into the fluid passage of the discharge device, the second liquid spreads more outward together with the dropletized gas-liquid mixed fluid that flows out of the second orifice. Since the turbulent diffusion acts to the utmost, the degree of mixing between the dropletized gas-liquid mixed fluid and the second liquid increases.

Next, the present invention will be described in detail.

In the mixing and stirring apparatus of the present invention, each inlet, both orifices, and both liquid inflow paths are formed in a dividable or indivisible block. As the material used for such a block and both orifices, various materials are selected according to the construction conditions and the material to be mixed and stirred. Examples of materials that can be threaded include materials such as aluminum, stainless steel, iron, and resin. Is preferably used.

Various materials are selected as the discharge tool used in the present invention depending on the construction conditions and the materials to be mixed and stirred.
For example, pipes such as a steel pipe, a PVC pipe, and a resin pipe are suitably used. In addition, the length of the ejection tool is appropriately 1.0 to 4.0 m.

As the compressible fluid used in the present invention, a gas such as air, nitrogen, carbon dioxide or the like is used. The gas is compressed by a compressor or the like, or introduced into the compressible fluid inlet through a pipe connection to a compression cylinder. You. In tunnel construction and the like, air is preferred from the viewpoint of safety such as lack of oxygen.

The mixing ratio of the first liquid and the second liquid used in the present invention can be from 1: 1 to 100: 1, but is generally 1: 1.
Used in a ratio of 〜１０10: 1. As the chemical liquid, any of two-liquid curable liquid chemicals can be used. For example, two-liquid curable (foamed) urethane for reacting an isocyanate component and a polyol component, or a water glass-based liquid for reacting a water glass with a curing agent such as an acid. A chemical solution or a silica resin that reacts isocyanate with water glass is exemplified. The lower the viscosity of the chemical, the better. If the viscosity is higher than 3000 cps, the droplets become large and the mixing state deteriorates. In this case, it is usually used at 1000 cps or less by heating.

The mixing and agitating apparatus of the present invention includes, for example, various construction methods such as ground stabilization such as tunnel construction, bedrock consolidation, filling of cavities, filling of voids and cavities around underground structures such as tunnels, and ground surface. It is used for spraying cavities (openings), spraying construction structures, and filling urethane into the internal space of artificial structures such as floating piers.

[0015]

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

FIG. 1 to FIG. 3 show an embodiment of the mixing and stirring device of the present invention. In this embodiment, the mixing and stirring device includes a first block 1, a second block 2 detachably attached to the first block 1 with bolts 5, and a second block 2.
A third block 3 is detachably fixed to the block 2 with bolts (not shown). A nozzle 4 is detachably fixed to the third block 3.

The first block 1 is provided with a cylindrical concave portion on one side (left side in the drawing) of the first block 1 so that the compressed air introducing hole 10 (the opening of the compressed air introducing hole 10 is 11), and a compressed air supply hose (not shown) is connected to the compressed air introduction hole 10. Further, the first block 1 is concentric with the compressed air introduction hole 10 along the axial direction of the compressed air introduction hole 10 from the other side surface (the right side surface in the drawing). A first flow path 13 having a cylindrical shape smaller than the inner diameter is formed (see FIG. 4). The rear end face (the right end face in the drawing) of the compressed air introduction hole 10 and the front end face (the left end face in the drawing) of the first flow path 13 are in contact with the compressed air introduction hole 10 and the first flow path 13. They are concentric and communicate with each other via a cylindrical intermediate hole 12 having a diameter smaller than the inner diameter of the compressed air introduction hole 10 and the first flow path 13.

The first block 1 has a predetermined portion (an upper portion in the drawing) extending inward from a predetermined portion (an upper portion in the drawing) of the outer peripheral surface thereof and extending toward the front end of the first flow path 13 (an upper portion in the drawing).
A first liquid introduction passage 15 (the upper end opening of the first liquid introduction passage 15 becomes a first liquid introduction port 16) is formed in the first liquid introduction passage 15. (Not shown). The first liquid introduction path 15 and the first flow path 13 constitute a first liquid inflow path.

The intermediate hole 12 has a threaded portion (not shown) formed on the inner peripheral surface thereof. The threaded portion is formed on the outer peripheral surface on the left side of the cylindrical primary atomizing orifice 17. Threaded portions (not shown) are engaged. The primary atomizing orifice 17 is formed with a truncated cone-shaped inclined portion 18a and a small-diameter cylindrical throttle portion 18 following the right end opening of the inclined portion 18a on the inner peripheral surface of the right end portion. The right end opening of the portion 18 is the right end opening of the primary atomizing orifice 17. Then, the left end opening of the primary atomizing orifice 17 is positioned flush with the left end opening of the intermediate hole 12, and the right end opening protrudes further rightward from the right end of the first liquid introduction passage 15. In the positioned state, the primary atomizing orifice 17 is fixed to the intermediate hole 12.

The second block 2 has a left side surface (that is, a connection surface with the right side surface of the first block 1).
Further, a communication hole 20 having a cylindrical shape larger in diameter than the inner diameter of the throttle portion 18 of the primary atomizing orifice 17 is formed in a concentric manner with the compressed air introduction hole 10. The second block 2
A cylindrical second flow path 21 which is concentric with the compressed air introduction hole 10 and larger in diameter than the communication hole 20 is formed along the axial direction of the compressed air introduction hole 10 from the right side thereof. (See FIG. 5). The right end opening of the communication hole 20 and the left end opening of the second flow path 21 are concentric with the compressed air introduction hole 10 and have a cylindrical shape larger in diameter than the communication hole 20.
The second flow path 21 communicates with a small-diameter cylindrical intermediate hole 22.

The second block 2 has a predetermined portion (an upper portion in the drawing) extending inward from a predetermined portion (an upper portion in the drawing) of the outer peripheral surface thereof and extending toward the front end of the second flow path 21.
A second liquid introduction passage 24 (the upper end opening of the second liquid introduction passage 24 serves as a second liquid introduction port 25) is formed in the second liquid introduction passage 24. (Not shown). The second liquid introduction path 24 and the second flow path 21 constitute a second liquid inflow path.

The intermediate hole 22 has a thread (not shown) formed on the inner peripheral surface thereof. The thread is formed on the outer peripheral surface of the left side of the cylindrical secondary atomizing orifice 26. Threaded portions (not shown) are engaged. The secondary atomizing orifice 26 has a truncated cone-shaped inclined portion 27a and a small-diameter cylindrical throttle portion 27 connected to the right end opening of the inclined portion 27a formed on the inner peripheral surface of the right end portion. The right end opening of the portion 27 is the right end opening of the secondary atomizing orifice 26. The inner diameter of the secondary atomizing orifice 26 is set to be the same as the inner diameter of the communication hole 20. The left end opening of the secondary atomizing orifice 26 is the intermediate hole 2.
The second atomization is performed on the inner peripheral surface of the intermediate hole 22 in a state where the left end opening is positioned flush with the second end and the right end opening is positioned flush with the right end opening of the second flow path 21. The orifice 26 is fixed.

The third block 3 and the nozzle 4 are cylindrical, and are formed in a plurality of concave portions (not shown) formed in the inner peripheral surface of the third block 3 on the outer peripheral surface of the left end portion of the nozzle 4. A plurality of projections (not shown) are detachably engaged. The right end opening of such a nozzle 4 is closed by a lid 29, and a discharge port 4a formed of four circular holes is formed at an equal interval at the right end. The inner diameter of the nozzle 4 is set to be the same as the inner diameter of the second flow path 21. In FIG. 1, reference numeral 30 denotes an O-ring. In addition,
In this embodiment, as the first liquid, isocyanate (viscosity 50 cps) is used, and as the second liquid, polyol (viscosity 70 cps) is used, and the mixing ratio of the first liquid and the second liquid =
Two-component curable urethane foam used at 7: 1 is used.

In the above structure, first, the compressed air supply hole 1 is connected to the compressed air supply hose through the compressed air introduction port 11.
0, the first liquid is introduced from the first liquid supply hose through the first liquid introduction port 16 into the first liquid introduction path 15,
The second liquid is introduced into the second liquid introduction passage 24 from the second liquid supply hose via the second liquid introduction port 25. Then, the compressed air introduced into the compressed air introduction hole 10 flows into the primary atomizing orifice 17, and while passing through the primary atomizing orifice 17, the flow velocity increases and the pressure decreases (negative pressure) (Bernoulli). After theorem), the throttle section 18 of the primary atomizing orifice 17
Then, the pressure is increased and the pressure is further reduced, and is ejected from the primary atomizing orifice 17. Since the cross-sectional area of this jet is rapidly expanded, the compressed air expands and diffuses while the flow velocity decreases and the pressure increases. On the other hand, the first liquid introduced into the first liquid introduction path 15 flows into the first flow path 13 and then joins by being sucked into the compressed air ejected from the primary atomizing orifice 17 to expand the compressed air. Atomized by diffusion.

Next, the mixed fluid of the atomized first liquid and the compressed air passes and jets through the secondary atomizing orifice 26, and is similar to the atomization by passing and jetting through the primary atomizing orifice 17. Repeat the action. That is, after the flow velocity increases and the pressure decreases while passing through the secondary atomizing orifice 26, the pressure is further increased and reduced in the throttle portion 27 of the secondary atomizing orifice 26, and the secondary atomizing orifice 26 is further reduced. Erupts from Since the gas-liquid jet has a sudden increase in the cross-sectional area of the flow path, the compressed air expands and diffuses while the flow velocity decreases and the pressure increases. On the other hand, the second liquid introduced into the second liquid introduction passage 24 flows into the second flow passage 21 and then merges into the gas-liquid ejected from the secondary atomizing orifice 26 so that the compressed air expands. Atomized by diffusion. In this manner, the second liquid and the first liquid are atomized and mixed near the outlet of the throttle section 27 of the secondary atomizing orifice 26 and near the inlet of the third block 3, and the two-liquid mixed dropletized fluid is formed. can get. In this embodiment, the term “atomization mixing” means that the liquid is turned into fine particles by atomization, and the surface area increases hundreds to thousands times.
By mixing the liquid and the first liquid, the contact area increases and the mixing property is greatly improved. Next, 2
Since the liquid-mixed dropletized fluid flows through the nozzle 4 without being immediately released to the atmosphere, a turbulent flow of the compressed air is generated in the nozzle 4 and the turbulent flow is generated. It is discharged from 4a in all directions. In this embodiment, air corresponding to the inner diameter of the nozzle 4 is supplied to the compressed air inlet 11 so that turbulent flow occurs in the nozzle 4.
And as a result, the Reynolds number 23
00 or more.

As described above, in the above embodiment, since the first and second liquids are mixed and stirred using the primary atomizing orifice 17 and the secondary atomizing orifice 26, sufficient mixing and stirring can be performed. In addition, efficient mixing and stirring can be performed with a simple structure, and changes in material characteristics (mixing ratio, viscosity, etc.) and materials can be easily handled. That is,
By combining the first liquid having a large mixing ratio with the primary atomizing orifice 17 having a high atomizing efficiency, atomization can be performed efficiently. In addition, by using the turbulent stirring in the nozzle 4, the inside of the nozzle 4 can be effectively used as a mixing chamber. Further, after the mixing and stirring are completed, by supplying compressed air to each of the inlets 11, 16, and 25 without using a cleaning liquid, the inside can be cleaned by blow cleaning. The body can be used any number of times. Further, each of the blocks 1 to 3 can be disassembled, and cleaning is easy.

FIG. 6 shows another embodiment of the mixing and stirring device of the present invention. In this embodiment, the inner diameter of the nozzle 4 is set to be larger than the inner diameter of the second flow path 21 of the second block 2. In this case, since the second liquid and the ejected gas liquid flowing into the nozzle 4 after passing through the second flow path 21 spread more outward, larger turbulent diffusion occurs in the nozzle 4, and this turbulent diffusion Increases the mixing effect. Other parts are the same as those of the above-described embodiment, and the same parts are denoted by the same reference numerals. In this embodiment, the same operation and effect as those of the above embodiment can be obtained.

FIG. 7 shows a modification of the nozzle 4 shown in FIG. In this modification, the nozzle 4 is formed of a cylindrical body. Therefore, the nozzle 4 in FIG. 7 is not provided with the lid 29 and the four discharge ports 4a as shown in FIG. The other parts are the same as those of the nozzle 4 shown in FIG. Also, when the nozzle 4 shown in FIG. 7 is used, the same operation and effect as those when the nozzle 4 shown in FIG. 1 is used can be obtained.

[0029]

As described above, the mixing and stirring apparatus of the present invention is not a structure using a mechanical stirring mechanism like a mechanical stirring mixer or a static mixer, but a structure using fluid engineering (that is, a compressible mixer). The structure is based on atomization mixing by the Bernoulli theorem and turbulent agitation theory by the Reynolds rule) using a fluid, and the two liquids can be efficiently mixed and stirred with a simple structure. Material properties (mixing ratio, viscosity, etc.) compared to mechanical stirrers and static mixers
-It is possible to respond to changes in materials etc. with simple adjustment. That is, the correspondence is based on the hole diameters of the two orifices, the gap between the first orifice and the first liquid inflow passage, the gap between the second orifice and the second liquid inflow passage, and the entrance of the compressible fluid into the compressible fluid inlet. It is possible by adjusting the air condition (pressure, flow rate, etc.), and it is stable in quality control (guaranteed). Besides, at the time of washing,
By introducing a compressive fluid from each inlet, blow cleaning becomes possible, no cleaning liquid is required, and the size of the system including the cleaning circuit is hardly increased. Therefore, it is environmentally friendly and suitable for outdoor construction. In addition, the above-mentioned cleaning enables repeated use. Further, by selecting the material, lightening and compactness can be maximized, and portability and operability are excellent. Further, since the first liquid is passed through the two orifices together with the compressive fluid, efficient atomization can be achieved by selecting a material having a large mixing ratio (a material having a large flow rate) as the first liquid. Will be possible.

In the present invention, when the inner diameter of the fluid passage of the discharge device is set to be larger than the inner diameter of the second liquid inflow passage at the connection portion between the second liquid inflow passage and the fluid passage of the discharge device. When the second liquid that has passed through the second liquid inflow path flows into the fluid passage of the discharge device, the second liquid spreads more outward together with the dropletized gas-liquid mixed fluid that flows out of the second orifice. Since the turbulent diffusion acts to the utmost, the degree of mixing between the dropletized gas-liquid mixed fluid and the second liquid increases.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a mixing and stirring device of the present invention.

FIG. 2 is a left side view of the mixing and stirring device.

FIG. 3 is a right side view of the mixing and stirring device.

FIG. 4 is an explanatory diagram of a first block.

FIG. 5 is an explanatory diagram of a second block.

FIG. 6 is a cross-sectional view showing another embodiment of the mixing and stirring device of the present invention.

FIG. 7 is a sectional view showing a modified example of the nozzle.

[Explanation of symbols]

 4 Nozzle 11 Compressed air inlet 16 First liquid inlet 17 Primary atomizing orifice 25 Second liquid inlet 26 Secondary atomizing orifice

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yuji Noso 3600, Gezu, Kita-gaiyama, Komaki-shi, Aichi F-term in Tokai Rubber Industries Co., Ltd. (Reference) 4G035 AB26 AB37 AC14 AC16 AC50 4G037 DA14 EA01

Claims (2)

[Claims] A first liquid introduction port for introducing a first liquid;
A second liquid introduction port for introducing a liquid, a compressible fluid introduction port for introducing a compressible fluid, and a first orifice for allowing the compressive fluid introduced from the above-mentioned compressible fluid introduction port to flow in and then dropping out. A second orifice that flows in the dropletized gas-liquid mixed fluid that has flowed out of the first orifice and then further drops and flows out; and a first orifice that is introduced through the first liquid introduction port.
A first liquid inflow passage through which a liquid flows into the dropletized gas-liquid mixed fluid flowing out of the first orifice; and a dropletized gas flowing out of the second orifice through a second liquid introduced through the second liquid inlet. A second liquid inflow passage for flowing into the liquid mixture fluid;
A mixing / stirring device comprising: a discharge device for discharging a two-liquid mixed droplet liquid in which the second liquid from the second liquid inflow path is mixed with the droplet liquid gas-liquid mixture from the orifice. . 2. The connecting portion between the second liquid inflow path and the fluid passage of the discharge device, wherein the inner diameter of the fluid passage of the discharge device is set to be larger than the inner diameter of the second liquid inflow passage. Mixing stirrer.