JPH0673619B2 - Liquid mixing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static mixing apparatus capable of uniformly mixing two or more kinds of fluids by utilizing the energy of the fluids during liquid transportation, for example, a water-oil emulsion. It is suitable for use in a homogenizing device for more complete emulsification and a mixing casting device that mixes a liquid resin raw material and a curing agent at a high speed and casts and cures.

[0002]

2. Description of the Related Art Heretofore, as a fluid mixing apparatus, there has been used an apparatus which inserts or dips a rotating stirring blade into a fluid and gives power such as swirling or collision to the fluid to perform mixing and homogenization. . In this type of mixing device, a mechanism for supplying power such as rotation and vibration is indispensable, so the structure becomes complicated and large, and it is particularly desirable to continuously mix in the middle of the pipeline that is being transferred due to the pressure difference. in case of,
It is difficult to seal the fluid, which causes problems such as liquid leakage and entry of outside air into the fluid. So in recent years mixing during fluid transfer,
As a method for performing homogenization, for example, a plate having a twist of 180 ° and a plate having a phase difference of 90 ° and having a reverse twist are loaded into a channel, and this is repeated n times to make the fluid 2 ^n. A method of equal division has been proposed. However, in this method, the theoretically expected mixing effect cannot be obtained, and at least 30 or more units need to be passed, which makes the apparatus large and the time required for mixing becomes long. This is because in the line where the fluid is transferred by the differential pressure, the fluid flows far more in the central portion that is not swung by the torsion plate than in the portion near the outer periphery where mixing and division are reliably performed. This is due to the basic defect of being easy.

Various proposals have been made to remedy this drawback, but the shape of the unit is complicated and very expensive, and the turbulent flow is generated by a jet pressure or a violent counterflow with a larger pressure difference. No such thing as the one satisfying the original purpose of the static mixing device, such as simplicity, small size, sealing, washing, easy replacement, and low cost, has not been obtained.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to provide a small-sized device which can be easily mixed and homogenized only by a differential pressure when it is charged in a pipeline, and can be easily washed and decomposed. To provide a device capable of

[0005]

According to the present invention, a spiral groove is formed on the surface of a cylindrical body at the same angle in the axial direction and at the same pitch in the opposite direction, and mixing is provided with a cross-shaped cross-flow passage formed by the groove. The block is housed in the elastic cylinder, and the fluid is press-fitted into the cross flow passage and passed through, so that the fluid in the circumferential direction collides with the fluid in the cross flow passage closed by the mixing block surface and the inner wall of the elastic cylinder. , And at the same time, it is uniformly divided by repeating the division into 1/2.

In the present invention, the cross-sectional shape, the number of cross-sectional areas, the groove pitch, the groove angle, etc. of the spiral groove recessed on the surface of a cylindrical body having an appropriate diameter are selected according to the properties of the fluid, the flow rate, the mixing ratio and the like. Further, the mixing blocks can be provided in a plurality of stages in series, and in this case, the pitch shape of the grooves and the like can be successively reduced in the downstream direction to increase the number of grooves and the number of intersecting points to improve the mixing efficiency. In this case, it is desirable that the sum of the groove cross-sectional areas of each step be equal.

Further, a conical guide cone for guiding the liquid to be mixed to the cross flow passage of the block is provided at the upstream end of the block on the supply side, or a liquid collecting cone is provided on the discharge side to provide a space volume that does not contribute to mixing. The cleaning liquid can be saved by reducing the amount and the liquid replacement time can be shortened. In any case, the elastic cylinder that is in close contact with the outer periphery of the cylindrical body can prevent the occurrence of short paths or the accumulation of the reservoir by applying the pressure of the processing fluid itself or the external pressure to the periphery thereof.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is a housing, 2 is a base block, 3 is a cylindrical case, 4 and 5 are inlets for the mixed liquid AB, 6 is a liquid passage for the mixed liquid, 6a is a supply port, and 7 is The introducing chamber 8 is a guide cone or a separator having an introducing groove 9 on its surface. Reference numeral 10 denotes a mixing block rotatably connected to a guide cone, and a plurality of spiral grooves 12 formed on the surface of a stainless steel cylindrical body 11 at a predetermined angle and at the same pitch with respect to the central axis of the cylindrical body, Cross flow passages 14 are formed in which 13 are respectively recessed in opposite directions. Reference numeral 15 is an intersection of the grooves, which are distributed at a uniform density on the surface of the mixing block. Reference numeral 16 is a rubber elastic cylinder containing the mixing block, 17 is a discharge space, and 18 is a mixed liquid discharge port, which is connected to the pipeline. Reference numeral 19 is a pressurizing chamber provided between the cylindrical case 3 and the elastic cylinder 16, and is maintained at a desired pressure by the pressurized fluid from the supply port 20.

The mixed liquids A and B are introduced from the supply port 6a through the introduction groove 9 into the cross flow passage 14 of the mixing block in an incompletely mixed state. In this case, if the introduction groove 9 of the guide cone and the first intersection 15 of the intersecting flow path are arranged so as to coincide with each other, the liquid to be mixed will immediately reach 2 at the first intersection 15.
Will be divided. The divided liquids are spiral grooves 12 and 1 of the cross flow passage.
3 to reach the second intersection 15, respectively. At the second intersection, the liquids from the other spiral grooves 12 and 13 collide with each other, and mixing and redivision are performed, and the liquid is guided to the third intersection.

Fluid is pressurized from the outside of the elastic cylinder so as to oppose the hydraulic pressure in the cross flow passage, and the inner surface of the elastic cylinder is in close contact with the surface of the mixing block. Therefore, even if the surface precision of the mixing block is not very high, the passing liquid is introduced into each intersection through only the spiral groove without short-passing, and the mixing action is obtained. In the present invention, the mixing action in the cross flow passage is limited to the liquid passage division.
Assuming that n = 30, it is about 1 / 1.0 billion
Sufficient mixing is possible, but normally n = 10-15
Good mixing results are obtained. The reason for this is not clear, but in the cross flow passage, the counter flow
A vortex flow due to the collision of
Presumed that they synergistically contribute to continuous mixing
To be done.

[0011]

[Embodiment 2] In the apparatus shown in FIG. 2, a plurality of mixing blocks are connected in series in multiple stages, and the pitch of the spiral groove forming the cross flow passage of each block is reduced by ½ in the downstream direction and the groove is disconnected. The area is also halved. The multi-stage connection mixing block 30 is composed of a first block 31, a first block 32, a third block 33 and a fourth block 34 having a liquid collecting cone 35, and each mixing block has an uneven portion for fitting connection. I have it. Reference numeral 36 denotes a spacer, which is provided to tightly store the mixing block 30 including the guide cone 8 and the discharge cone 35 in the introduction chamber 7 and the elastic cylinder 16, and the communication groove 37 provided at the peripheral edge is the first. The last intersection of the block and the first intersection of the second block are communicated.

In the apparatus of this embodiment, for example, the angle of the spiral groove of the fourth block is the same as that of the first block, but the groove pitch is 1/8. Therefore, the groove cross-sectional area is also about 1/8. Since the mixing action of this device is the same as that of the above-mentioned embodiment, a detailed description thereof will be omitted, but the number of intersections in the liquid path increases exponentially and the amount of liquid decreases in inverse proportion to each stage. Since the division is repeated, there is an advantage that homogeneous mixing is performed in a short section. Since this device has a small liquid passage space in the container, washing or liquid exchange can be performed in a short time.

[0013]

[Experimental Example] In the apparatus of Example 1, the mixing block has a diameter of 50 mm, a length of 200 mm, and a spiral groove cross-sectional area of about 1
mm ² , groove angle about 60 ° Number of intersections on a straight line along the axis n = 3
When salad oil and colored water were passed as the liquid to be mixed at a pressure close to normal pressure as 3, the mixing state was better than that obtained by the conventional stirring blade type mixing device. (The mixed state was compared by allowing the discharged mixed solution to stand still.) After that, when tap water was passed through this device to wash the inside, the presence of oil droplets and coloring were not observed in about 5 seconds, and the size was about the same. Cleaning time is about 6 times compared to the conventional static line mixer
It was shortened to 1/0.

[0014]

The device of the present invention is non-powered, has no moving parts, and is small in size, so that it can be used by being inserted in a pipeline. It is relatively easy to manufacture, and disassembling and assembling are also easy and highly efficient. It can also be used for mixing viscous liquids.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a main part of an apparatus according to an embodiment.

FIG. 2 is a half cross-sectional view of another example device.

[Explanation of symbols]

 8 is a guide line 9 is an introduction groove 10 is a mixing block 12 and 13 is a spiral groove 14 is an intersecting flow path 15 is an intersection point 16 is an elastic cylinder 19 is a pressurizing chamber 30 is a multistage connecting mixing block 35 is a collecting cone

Claims (5)

[Claims] 1. A mixing block having a cross flow passage formed on the surface of a cylindrical body by a plurality of spiral grooves recessed in opposite directions at a predetermined same angle and at the same pitch with respect to a central axis from the outside. A liquid mixing apparatus which is housed in a pressurizable elastic cylinder and which supplies a plurality of mixed liquids from one end of the mixing block and discharges the mixed liquid from the other end. 2. A liquid mixing apparatus according to claim 1, wherein a plurality of mixing blocks are connected in series in a multi-stage manner and the pitch of the spiral groove of each block is formed to be 1/2 in the downstream direction. 3. The liquid mixing apparatus according to claim 2, wherein the angle of the spiral groove is different for each block. 4. The liquid according to claim 1, wherein a guide cone with an introduction groove for guiding the mixed liquid to the cross flow passage of the block is fixedly provided at the upstream end of the mixing block. Mixing device. 5. A liquid collecting cone for forming a conical space for collecting a mixed liquid between the discharge end of the mixing block and the vessel wall, according to any one of claims 1, 2, 3, and 4. Liquid mixing device.