JP2818734B2 - Device for mixing powder into liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for easily mixing a powder and a liquid into a stirring tank without scattering the powder, which can be easily incorporated in a production line. And a mixing device for mixing powder into a liquid.

[0002]

2. Description of the Related Art In the production of various cosmetics, foodstuffs and the like, there are many cases in which a step of mixing or dispersing a powder in a liquid is carried out. In ordinary manufacturing equipment, such mixing of powder and liquid is performed by pneumatic transportation of powder and liquid by liquid sending means such as a pump.
Each of them is separately charged in a mixing tank, and the two are stirred and mixed in the mixing tank.

[0003] Therefore, the powder is scattered before mixing and adheres to an unnecessary portion to stain the equipment. In addition, since the powder is usually charged into the mixing tank after the measurement, the powder is scattered in the air. This causes an error in the charged amount of the powder. Also, since both are separately charged, it takes a long time to mix, and furthermore, agglomerates of powder (so-called lumps) are easily generated, and reliable and good mixing cannot be performed.
There is a problem that it takes time to mix and dissolve.

[0004] In order to solve such problems, a device for mixing various powders into a liquid (powder-liquid mixing device) has been developed and sold. For example, the apparatus shown in FIG. 4 is a powder-liquid mixing apparatus having a double pipe structure of a powder supply pipe 50 and a liquid supply pipe 52, where (a) is a top view and (b) is a front sectional view. Are respectively shown.

In this device, the powder is supplied by a free fall or pneumatic transport as shown by an arrow a.
0 and discharged from the lower end of the powder supply pipe 50. On the other hand, as shown by the arrow b, the liquid
The liquid is supplied to the liquid supply pipe 52. Here, as shown in FIG. 4, since the introduction port 54 is disposed off the center of the liquid supply pipe 52 having a circular cross section, the liquid turns inside the liquid supply pipe 52 and proceeds downward, Powder supply pipe 50
The liquid and the liquid supply pipe 52 are sprayed in a conical thin film from the gap between the liquid and the liquid supply pipe 52 to mix the powder and the liquid.

However, this apparatus is intended to prevent the scattering of powder, and the portion where the liquid film is formed prevents the powder discharged from the powder supply pipe 50 from being scattered by the thin film. However, the generation of powder aggregates cannot be prevented, and the powder and liquid cannot be mixed well. In addition, the scattering prevention effect of powder,
It is only the part where the liquid thin film is formed, and is not complete.

[0007] The apparatus shown in FIG.
This is a device that mixes powder and liquid while preventing scattering of the powder by introducing the powder from the bottom of the device. That is, in this apparatus, the liquid is charged in the mixing tank 56 in advance, and the powder is charged into the mixing tank 56 from the bottom by the high-concentration air transport device 62 including the compressor 58 and the powder storage tank 60. Mix powder and liquid. According to this apparatus, it is possible to effectively prevent the powder from being scattered. However, for powder-liquid mixing, many of the functions (capacities) of the mixing apparatus 56a such as a stirrer installed in the mixing tank 56 Powders that cannot be sufficiently dispersed and mixed by the mixing device 56a at the moment when they are supplied into the liquid or in a very short time cannot be mixed well and cannot be used.

The apparatus shown in FIG. 6 is an apparatus for mixing powder and liquid by a so-called jet jet. In this device, the powder is filled in a hopper 66 fixed to a mixer 64. On the other hand, the liquid is stored in a surge tank 68, and is injected into the mixer 64 at a high pressure and at a high speed by a pressurizing pump 70 while its flow rate is measured by an integrating flow meter 72. By the jet jet of the liquid, the powder filled in the hopper 66 is sucked into the mixer 64,
And powder and liquid are mixed by strong turbulence of liquid,
Discharged as indicated by the arrow.

Further, the apparatus shown in FIG. 7 forms a powder shower film 74 by injecting powder transported from a powder feeder from a powder supply pipe 72 whose diameter gradually increases downward. Is sprayed from the same liquid supply pipe 76 to form a liquid shower film 78, and the two are mixed by contacting the two in a shower film state by an inflow apron 80, and a homomixer stator 83 driven by a motor 82 is used for crushing. By the stator 84 and the grinding stator 86,
The liquid and the powder are further mixed, the particle diameter of the powder is adjusted, and the powder is supplied to the next step through the discharge port 88.

According to the devices shown in FIGS. 6 and 7, the powder and the liquid can be mixed well without the powder being scattered. However, these devices are large-scale devices that require dedicated high-pressure pumps and motors, and cannot be easily incorporated into a production line.
There is a problem that the cost is high. Further, the device shown in FIG. 6 is a device that simply mixes the powder and the liquid by a linear jet using a so-called ejector, so that a good mixing efficiency can be obtained compared to the device scale and cost. May not be possible. Further, in the apparatus shown in FIG. 7, since it is necessary to apply a high mechanical shearing force to the powder-liquid mixture in order to disperse the powder in the liquid, the molecular composition of the powder is cut, and the physical properties are adversely affected. May give.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, without scattering powder and without impairing the physical properties of the powder. And liquid can be satisfactorily mixed (dispersed or dissolved) and supplied to the next step, such as a stirring tank, with a simple and low-cost mechanism that can be easily incorporated into existing production lines. An object of the present invention is to provide an apparatus for mixing into a liquid.

[0012]

In order to achieve the above object, the present invention provides a powder supply pipe for delivering powder by pneumatic transportation, a liquid supply pipe for ejecting a liquid, the powder supply pipe, A liquid mixing pipe having a cylindrical mixing pipe inserted into the same open end, wherein the mixing pipe changes a transport flow path of an air-powder mixture ejected from a tip of the powder supply pipe. The liquid supply pipe is arranged such that the liquid ejected from the liquid supply pipe and the powder whose flow path has been changed at the bent portion intersect with each other. An apparatus for mixing into a liquid is provided.

[0013] In the mixing device for mixing powder into a liquid, it is preferable that a baffle plate that obstructs the flow of the powder and the fluid is further disposed downstream of the bent portion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a powder mixing device (hereinafter referred to as a powder-liquid mixing device) of the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

FIG. 1 is a schematic diagram showing an example of the powder-liquid mixing apparatus of the present invention. The powder-liquid mixing device 10 of the present invention basically includes
It comprises a powder supply pipe 12 for supplying powder by pneumatic transportation, a liquid supply pipe 14 for supplying liquid, and a cylindrical mixing pipe 16 for mixing powder and liquid.

The powder supply pipe 12 and the liquid supply pipe 14 are
It is inserted and arranged at the same open end of the mixing tube 16. In the illustrated example, the powder supply pipe 12 and the liquid supply pipe 14
Are fixed to a flange 18 that closes the open end on the upstream side (upstream side in the flow direction of the powder and liquid) of the mixing tube 16, and the flange 18 is attached and fixed to the mixing tube 16 by a fixing member 20. Thereby, the powder supply pipe 12 and the liquid supply pipe 14 are inserted into the same open end of the mixing pipe 16 and fixed.

In the powder-liquid mixing apparatus 10 according to the present invention, the method of arranging and fixing the powder supply pipe 12 and the liquid supply pipe 14 is not limited to the illustrated example, but may be any known fixing method used in ordinary piping equipment. Are all available.

Further, in the powder-liquid mixing apparatus 10 of the present invention, the powder is transported from the powder supply pipe 12 by pneumatic transport, and various pneumatic transport apparatuses capable of securing necessary flow rates and flow rates are used. It is possible. Further, the liquid supply pipe 14
There is also no particular limitation on the method of supplying liquid from the apparatus, and any of various known liquid feeding means can be used as long as the necessary flow rate and flow velocity can be secured, such as a method using a pump or the like, a method using a head, or the like. is there. The shape of the liquid supply pipe 14 is not particularly limited, but is in the same direction as the transportation path of the air-powder mixture changed by the bent portion 22 described later (the vertical direction in FIG. 1).
Has a shape that gradually expands in a direction (perpendicular to the plane of FIG. 1) perpendicular to the transport path, so that the ejected liquid spreads in a fan shape and reliably intersects the air-powder mixture. It is preferable to adopt a configuration.

In the powder-liquid mixing apparatus 10 of the present invention, the mixing pipe 16 has a bent portion for changing the transport flow path of the air-powder mixture (hereinafter referred to as powder) sent from the powder supply pipe 12. The liquid supply pipe 14 is disposed such that the liquid ejected from the liquid supply pipe 14 intersects the powder whose transport channel has been changed by the bent portion 22.

That is, as shown by an arrow a in FIG. 1, the powder that has been transported by air and sent out from the powder supply pipe 12 initially travels linearly on the air flow, but the bent portion 22 Then, it collides with the inner wall of the mixing tube 16, is diffused and the flow path is changed, and advances downstream according to the shape of the bent portion 22. On the other hand, the liquid supply pipe 14 ejects the liquid so as to block the flow path of the powder by the bent portion 22 as shown by the arrow b. That is, the liquid supply pipe 14 supplies the liquid jetted linearly to the flow path change start portion (the bent portion 22) of the powder.
(The most upstream part of the liquid supply pipe), and the powder and the liquid ejected from the powder supply pipe 12 and the liquid supply pipe 14 are arranged so as to intersect with the liquid.

With this configuration, the powder and the liquid are satisfactorily mixed by the diffusion of the powder and the intersection of the transport flow paths of the powder and the liquid, and the turbulence is generated by the intersection of the two. As a result, the powder and the liquid can be satisfactorily and surely mixed without generating lumps and the like. Further, the powder is directly supplied to the mixing pipe 16 without being discharged from the powder supply pipe 12 to the outside, is immediately mixed with the liquid, and is ejected in a good mixing state, so that the powder may be scattered. Instead, the powder and liquid can be mixed at an accurate mixing ratio by adjusting the flow rate of both powder and liquid according to the respective mixing amount (mixing ratio) and supplying them from both supply pipes. It is. Moreover, since the powder supply pipe 12 and the liquid supply pipe 14 are simply inserted and fixed in the mixing pipe 16 having the bent portion 22, the cost is low.
Moreover, it can be easily integrated in-line into an existing production line.

The shape of the bent portion 22 and the liquid supply pipe 14
The direction in which the liquid is ejected from the nozzle is not particularly limited as long as the flow path between the liquid and the powder intersects, and may be appropriately determined according to the production line, the flow rate of the powder and the liquid, and the like. here,
In order to reliably mix the powder and the liquid, most of the powder particles collide with the inner wall of the mixing tube 16 at the bent portion 22 and form the bent portion 22 so as to sufficiently diffuse,
Or (further), it is preferable to adjust the direction of powder ejection from the powder supply pipe 12.

In the powder-liquid mixing apparatus 10 shown in the figure, baffles 24 and 26 which obstruct the flow of the powder-fluid mixture are arranged downstream of the bent portion 22 of the mixing tube 16. As shown in FIGS. 1 and 2, the baffles 24 and 26 have an arcuate shape and are inclined in the flow direction of the powder-fluid mixture and are arranged in the mixing pipe 16 so as to obstruct the flow. You. By having such baffles 24 and 26, turbulence is generated in the flow of the powder-fluid mixture at this portion, and the mixing of the powder and the fluid can be improved.

There is no particular limitation on the shape and size of the baffle, and further on the number of arrangements, and various shapes and sizes that obstruct the flow of the powder-fluid mixture and generate turbulence can be used. The number is not limited to two in the illustrated example, and one or three or more baffles may be provided.

However, if the baffle plate has too large a flow obstruction effect, such as when the two baffle plates both exceed the center line of the mixing tube 16 or when the angle of the baffle plate is too large, the powder fluid Since the flow of the mixture may not be smooth and back pressure may occur, it is preferable to set an appropriate size and shape according to the flow rate of the powdery fluid mixture and the like. At this point, the inclination angle of the baffle plates 24 and 26 is preferably about 30 ° in the downstream direction. Also, contrary to FIG. 2, if the baffle plate is arranged to be inclined in the opposite direction to the flow of the powdery fluid mixture, a dead space is likely to occur at the contact portion between the baffle plate and the inner wall of the mixing tube, Not preferred.

The powder-liquid mixing device 10 of the present invention has
It may be installed alone so that the powder-liquid mixture flows into a vat or a storage tank. In order to further improve the mixing state of the powder-liquid mixture, as shown in FIG. 3
0 and the like, and the powder-liquid mixture mixed by the powder-liquid mixing apparatus 10 of the present invention may be further stirred in the mixing tank 30.

The apparatus for mixing powder into a liquid according to the present invention has been described in detail above. However, the present invention is not limited to the above-described embodiment, and various changes and improvements can be made without departing from the scope of the present invention. It goes without saying that it may be performed.

[0028]

As described above in detail, according to the apparatus for mixing powder into a liquid according to the present invention, the powder is not scattered and does not affect the physical properties of the powder. The powder and liquid can be mixed well (dispersed or dissolved) and supplied to the next process such as a stirring tank. The mechanism is simple and low cost, and it can be easily incorporated into existing production lines. It can be suitably used for various applications.

[Brief description of the drawings]

FIG. 1 is a schematic view of an example of a device for mixing powder into a liquid (powder-liquid mixing device) according to the present invention.

FIG. 2 is a partial schematic cross-sectional view of an apparatus for mixing powder into a liquid shown in FIG.

FIG. 3 is a diagram conceptually showing an example of use of a mixing apparatus for mixing powder into a liquid shown in FIG.

FIG. 4 is a schematic view of an example of a conventional powder-liquid mixing device,
(A) is a top view, and (b) is a front view cross section.

FIG. 5 is a schematic view of an example of a conventional powder-liquid mixing device.

FIG. 6 is a schematic view of an example of a conventional powder-liquid mixing device.

FIG. 7 is a schematic view of an example of a conventional powder-liquid mixing device.

[Explanation of symbols]

 Reference Signs List 10 Mixing device for powder into liquid (powder-liquid mixing device) 12, 50, 72 Powder supply tube 14, 52, 76 Liquid supply tube 16 Mixing tube 18 Flange 20 Fixing member 22 Bent portion 24, 26 Baffle plate 30 , 56 mixing tank 54 inlet 58 compressor 60 powder storage tank 62 high-concentration air transport device 64 mixer 66 hopper 68 surge tank 70 pressurizing pump 72 integrating flow meter 74 powder shower membrane 78 liquid shower membrane 80 inflow apron 82 Motor 83 Homomixer stator 84 Crushing stator 86 Grinding stator 88 Discharge port

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Hosaka 18-4 Nihonbashi Koamicho, Chuo-ku, Tokyo Inside Nisshin Engineering Co., Ltd. (72) Inventor Takeyuki Miyashita Nihonbashi Koami, Chuo-ku, Tokyo No. 18-4, Nisshin Engineering Co., Ltd. (72) Inventor Shigeki Masutani 5 Kiyohakucho, Kuki City, Saitama Prefecture Inside of Shiseido Kuki Plant (72) Inventor Kazuhiro Nomura Kiyohisa, Kuki City, Saitama Prefecture No. 5, Shiseido Kuki Factory Co., Ltd. (72) Inventor Shigeo Saito 5, Kiyakucho, Kuki City, Saitama Prefecture No. 5, Shiseido Kuki Factory Co., Ltd. (56) References JP-A-60-87838 (JP, A) JP-A-60-68907 (JP, A) JP-A-61-201442 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B01F 3/12 B01F 5/00-5 / 26

Claims (2)

(57) [Claims] A powder supply pipe for delivering powder by pneumatic transportation;
A liquid supply pipe for ejecting a liquid; and a cylindrical mixing pipe in which the powder supply pipe and the liquid supply pipe are inserted into the same open end. The mixing pipe is ejected from a tip of the powder supply pipe. Air-powder mixture having a bent portion to change the transport flow path,
Further, the liquid supply pipe is arranged so that the liquid ejected from the liquid supply pipe and the powder whose flow path has been changed at the bent portion intersect, mixing the powder into the liquid. apparatus. 2. The powder mixing apparatus according to claim 1, further comprising a baffle plate for obstructing the flow of the powder and the fluid, on a downstream side of the bent portion. Mixing device into.