JPH04247228A - Liquid mixer - Google Patents

Abstract

PURPOSE:To excellently and homogeneously mix plural materials by placing a mixing block having a cross passage consisting of plural spiral recessed grooves formed on the surface of a column in an elastic cylinder, supplying plural liqs. to be mixed from one end of the block and discharging the liqs. from the other end. CONSTITUTION:Liqs. A and B incompletely mixed are introduced into the cross passage 14 of a mixing block 10 from a supply port 6a through an inlet groove 9. In this case, if the inlet groove 9 of a guide cone is allowed to coincide with the first intersection 15 of the cross passage, the liqs. are immediately divided at the first intersection 15 into two directions. The divided liqs. pass through the spiral grooves 12 and 13 of the cross passage, and are sent respectively to the second intersection 15. The liqs. are allowed to collide with the liqs. from other spiral grooves 12 and 13 at the second intersection 15, mixed and again divided and guided to the third intersection. The liqs. passed through the intersection are highly mixed, and the liq. mixture is passed through a discharge space 17 and discharged into a pipeline from a discharge port 18.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to a static mixing device that can uniformly mix two or more fluids by utilizing the energy of the fluid itself during liquid transportation. It is suitable for use in a homogenization device for more complete emulsification, and a mixing casting device for mixing liquid resin raw materials and a curing agent at high speed for casting and curing.

0002

[Prior Art] Conventionally, as a fluid mixing device, a device has been used in which a rotating stirring blade is inserted or immersed in the fluid and mixes and homogenizes the fluid by applying power such as swirling or collision to the fluid. . This type of mixing device requires a mechanism to provide power such as rotation and vibration, so the structure is complex and large, and it is especially necessary to mix continuously in the middle of a pipeline where pressure difference is used to transfer the mixture. in case of,
It is difficult to seal the fluid, causing problems such as leakage and outside air getting mixed into the fluid. Therefore, in recent years, mixing during fluid transfer,
As a method for homogenization, for example, a plate twisted by 180° and a plate twisted in the opposite direction with a phase difference of 90° are inserted into the flow path, and this is repeated n times to homogenize the fluid to 2n, etc. A method of dividing has been proposed. However, with this method, the theoretically expected mixing effect cannot be obtained, and it is necessary to pass through at least 30 or more units, which increases the length of the apparatus and the time required for mixing. This is because in a line where fluid is transferred by differential pressure, the fluid flows much more in the center where it is not rotated by the torsion plate than in the area near the outer periphery where mixing and division occur reliably. This is due to the basic flaw that it is easy to use.

[0003] Various proposals have been made to improve this drawback, but some have complicated shapes and are very expensive, others create turbulent flow by increasing the pressure difference and using jets or violent counterflows. However, no static mixing device has yet been found that satisfies the original objectives of a static mixing device, such as simplicity, small size, airtightness, cleaning, easy replacement, and low cost.

0004

[Problems to be Solved] This invention aims to provide a small device that can be inserted into a pipeline and easily achieve mixing and homogenization using only differential pressure, and furthermore, it is easy to clean and disassemble. The purpose is to provide a device that can

[0005]

[Means for Solving the Problem] The present invention provides a mixing system in which spiral grooves are formed in the axial direction at the same angle, the same pitch, and in opposite directions on the surface of a cylindrical body, and a twill-shaped intersecting flow path is formed by the grooves. The block is housed in an elastic cylinder, and the fluid is pressurized into the intersecting flow path and passed through the intersecting flow path, and the fluid is mixed by colliding with the motion components in the circumferential direction in the intersecting flow path that is sealed by the mixing block surface and the inner wall of the elastic cylinder. The mixture is homogeneously mixed by repeatedly dividing the mixture into halves.

In the present invention, the cross-sectional shape, number of cross-sectional area intersection points, groove pitch, groove angle, etc. of the spiral groove formed on the surface of a cylindrical body having an appropriate diameter are selected depending on the properties, flow rate, mixing ratio, etc. of the fluid. Further, a plurality of mixing blocks can be provided in series, and in this case, the pitch shape of the grooves, etc. can be gradually reduced in the downstream direction to increase the number of grooves and the number of intersection points, thereby improving the mixing efficiency. In this case, it is desirable that the total sum of the groove cross-sectional areas of each stage be equal.

Furthermore, a conical guide cone is provided at the upstream end of the supply side of the block to guide the liquid to be mixed into the cross flow path of the block, or a liquid collecting cone is provided at the discharge side to reduce the space volume that does not contribute to mixing. By reducing the number of cleaning fluids, the amount of cleaning fluid can be saved and the time for replacing the fluid can be shortened. In either 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 stagnation by applying the pressure of the processing fluid itself or external pressure to the periphery thereof.

[0008]

[Example] In Fig. 1, 1 is a housing, 2 is a base block, 3 is a cylindrical case, 4 and 5 are injection ports for the liquid to be mixed AB, 6 is a liquid passage for the liquid to be mixed, 6a is a supply port, and 7 is a The introduction chamber 8 is a guide cone or separator having an introduction groove 9 on its surface. 10 is a mixing block rotatably connected to the guide cone, which has a plurality of spiral grooves 12 on the surface of a stainless steel cylinder 11 at a predetermined angle with respect to the central axis of the cylinder and at the same pitch; 13 are recessed in opposite directions, thereby forming intersecting flow paths 14. Reference numerals 15 denote intersection points of the grooves, which are distributed at uniform density on the surface of the mixing block. 16 is an elastic cylinder made of rubber that houses a mixing block, 17 is a discharge space, and 18 is a mixed liquid discharge port connected to a pipeline. A pressurized chamber 19 is provided between the cylindrical case 3 and the elastic cylinder 16, and is maintained at a desired pressure by pressurized fluid from the supply port 20.

The liquids A and B to be mixed are introduced from the supply port 6a into the intersecting channel 14 of the mixing block through the introduction groove 9 in an incompletely mixed state. In this case, if the introduction groove 9 of the guide cone and the first intersection point 15 of the cross flow path are arranged to coincide with each other, the liquid to be mixed will immediately reach the first intersection point 15.
be divided. The divided liquid flows through the spiral grooves 12 and 1 of the intersecting flow path.
3 to the second intersection point 15, respectively. At the second intersection, the liquid collides with the liquid from the other spiral grooves 12 and 13, mixes and splits again, and is further guided to the third intersection.

As described above, the degree of mixing of the liquids to be mixed is gradually increased each time they pass through each intersection. For example, if the number of intersections in a certain route is n, it is theoretically divided evenly into 1/2n, so if n=20, it is approximately 1/1,000,000,
If n=30, the ratio will be about 1/1 billion, and sufficient mixing can be achieved for practical purposes. The elastic cylinder is pressurized by fluid from the outside so as to counteract the hydraulic pressure in the cross flow path, 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 ultra-high precision, the passing liquid is introduced into each intersection through only the spiral groove without making a short pass, and the above-mentioned mixing effect can be obtained.

[0011]

[Embodiment 2] The device shown in Fig. 2 connects a plurality of mixing blocks in series in multiple stages, reduces the pitch of the spiral grooves constituting the cross flow path of each block by 1/2 in the downstream direction, and cuts the grooves. The area is also set to 1/2. The multi-stage connected mixing block 30 includes a first block 3
1, a first block 32, a third block 33, and a fourth block 34 having a liquid collection cone 35, and each mixing block is provided with a concave and convex portion for fitting and connection. 36 is a spacer, which is provided to tightly accommodate the mixing block 30 including the guide cone 8 and the discharge cone 35 in the introduction chamber 7 and the elastic cylinder 16;
A communication groove 37 provided on the periphery communicates the final intersection of the first block and the first intersection of the second block.

In this embodiment of the apparatus, 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 set to 1/8. Therefore, the groove cross-sectional area is also approximately 1/8. The mixing action of this device is the same as that of the previous embodiment, so a detailed explanation will be omitted, but the number of intersections in the liquid path increases exponentially at each stage, and the amount of liquid decreases inversely proportionally. Since the division is repeated, there is an advantage that homogeneous mixing can be performed in a short period. Since this device has a small space for liquid passage inside the container, cleaning or liquid exchange can be performed in a short time.

[0013]

[Experiment example] In the apparatus of Example 1, the diameter of the mixing block was 50 mm, the length was 200 mm, and the cross-sectional area of the spiral groove was approximately 1.
mm2, groove angle approximately 60° Number of intersections on the straight line along the axis n =
As No. 33, when salad oil and colored water were passed through the mixture as liquids to be mixed at a pressure close to normal pressure, a better mixing state could be obtained than with the conventional stirring vane type mixing device. (The mixing condition was compared by letting the discharged mixed liquid stand still.) After that, tap water was passed through the device to clean the inside, and within about 5 seconds, the presence and coloring of oil droplets were no longer observed, and the same size Compared to the conventional static line mixer, the cleaning time is reduced to about 1/60th.

[0014]

[Effects] The device of the present invention is non-powered, has no moving parts, and is small, so it can be used by interposing it in a pipeline, and it is relatively easy to manufacture, easy to disassemble and assemble, and has a high cost. It can also be used for mixing viscous liquids.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing the main parts of an example device.

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

[Explanation of symbols]

8 is a guideline 9 is the introduction groove 10 is a mixing block 12 and 13 are spiral grooves 14 is a cross flow path 15 is the intersection 16 is an elastic cylinder 19 is a pressurized chamber 30 is a multi-stage connected mixing block 35 is a liquid collection cone

Claims (5)

[Claims] Claim 1: A mixing block having an intersecting flow path formed by a plurality of spiral grooves recessed in the surface of a cylindrical body at the same predetermined angle with respect to the central axis and at the same pitch in opposite directions, from the outside. A liquid mixing device that is housed in a pressurizable elastic cylindrical body and supplies a plurality of liquids to be mixed from one end of the mixing block and discharges the mixed liquid from the other end. 2. The liquid mixing device according to claim 1, wherein a plurality of mixing blocks are arranged in series in multiple stages, and the pitch of the spiral grooves of each block is 1/2 in the downstream direction. 3. The liquid mixing device 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 is fixedly provided at the upstream end of the mixing block to guide the liquid to be mixed into the intersecting flow path of the block. Mixing equipment. 5. Any one of claims 1, 2, 3, and 4, wherein a liquid collecting cone is provided at the discharge end of the mixing block to form a conical space for collecting the mixed liquid between the mixing block and the container wall. A liquid mixing device.