JP7281181B2 - Dispersion liquid transfer device - Google Patents

Description

The present invention relates to, for example, a dispersion liquid transfer apparatus capable of uniformly mixing and dispersing another liquid and fine particle powder in the liquid when the liquid is transferred.

There has been proposed an agitating rotating body that hardly generates fragments or shavings when it collides with a container or the like during rotation (see Patent Document 1). This rotating body has few projections on the outside, and a flow path connecting an intake port provided near the rotating shaft and a discharge port provided on the outermost periphery of the rotating body extends from the suction port in the direction of the rotating shaft. After going straight along, it turns at a right angle, goes straight toward the outside in the radial direction of the main body of the rotor, and reaches the discharge port.

Therefore, when the agitating rotor is immersed in the liquid and rotated, the liquid entering the flow path also rotates together with the rotor. As a result, a centrifugal force acts on the fluid in the flow path, causing the fluid in the flow path to flow outward in the radial direction of the rotating body, thereby generating a liquid flow around the rotating body. This agitates the solution.

This rotating body has the excellent feature of being able to uniformly agitate a highly viscous liquid when mixing it with another liquid or fine particle powder. Therefore, it is not suitable for stirring large volumes. For this reason, the applicant of the present application has proposed a stirring rotor that can be easily mass-produced and that can efficiently stir a large volume of liquid or gaseous fluid (see Patent Document 2).

The rotating body for stirring is a rotating body that rotates in a predetermined rotating direction around a rotating shaft perpendicular to a predetermined plane, and is a doughnut having an annular hollow portion surrounding the rotating shaft. a suction port provided in the donut-shaped main body adjacent to the rotation shaft and opening in the direction of rotation of the main body; and one or more discharge ports provided on the outermost peripheral surface of the donut-shaped main body. , which communicates from the suction port to the discharge port through the annular hollow part, and since there are no blades that create a spiral flow along the rotation axis, it can efficiently agitate without causing cavitation. It has the advantage of being able to

On the other hand, it is desired to uniformly disperse other liquids and fine particle powder in the highly viscous liquid while feeding the liquid. For example, when solidifying a synthetic resin, a highly viscous adhesive is uniformly mixed with a curing agent that accelerates curing, and when manufacturing tofu, a coagulant such as bittern is uniformly mixed with highly viscous soymilk. In some cases, it is easy to mix uniformly if the amount is small.

Japanese Patent No. 4418019 JP 2015-171684 A

However, when it is necessary to mix a large amount, assuming stirring in one stirring tank, it takes time to uniformly stir a highly viscous liquid in a large-capacity tank. Therefore, in a situation where the physical properties of the liquid are changed by coagulation or the like due to dispersion, dispersion in a large-capacity tank causes unevenness.

Therefore, there is a demand for a dispersion liquid transfer device that uniformly disperses other liquids and fine particle powder while transferring highly viscous liquids. In addition, there is a further demand for a dispersion/liquid-feeding device equipped with a stirring means that does not easily cause cavitation even when a highly viscous liquid is used to uniformly disperse other liquids or fine particle powders.

The present invention is capable of uniformly dispersing other liquids and fine particle powder while feeding not only liquids with a viscosity close to that of normal water but also highly viscous liquids. An object of the present invention is to obtain a dispersing liquid feeding device equipped with a stirring means that is less likely to cause a

The dispersion liquid transfer device according to the invention described in claim 1 includes a circular pipe portion for feeding a liquid, an upstream opening through which the liquid is introduced into the circular pipe portion, and a a liquid-sending tube having a downstream opening that is sent out of the tube;
a rotating body disposed so as to block the circular pipe portion and having a communication passage capable of feeding the liquid from the upstream side to the downstream side, and an outer diameter that does not come into contact with the inner wall diameter of the circular pipe portion;
a rotating means for rotating the rotating body coaxially with the axis of the circular tube;
A dispersion liquid feeding device comprising a supply means for supplying a liquid to be dispersed or a fine particle powder to be dispersed into a liquid flowing in a liquid feeding pipe on the upstream side or downstream side of the rotating body,
The communication passage of the rotating body is
one or more inlets provided on the upstream end surface;
It communicates with one or more discharge ports provided on the downstream end face communicating with the suction port,
the suction port is arranged at a position closer to the rotational axis of the rotating body than the discharge port;
The discharge port is arranged radially outward from the rotation axis relative to the suction port.

A dispersion liquid transfer device according to the invention described in claim 2 is a cylinder having a side surface with a certain gap on the inner wall surface of the circular tube part in which the rotating body according to claim 1 is arranged. It is characterized by being a body.

The present invention is capable of uniformly dispersing other liquids and fine particle powder while feeding not only liquids with a viscosity close to that of normal water but also highly viscous liquids. There is an effect that it is possible to obtain a dispersing liquid feeding device equipped with a stirring means that is less likely to cause turbulence.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing the configuration of an embodiment of a dispersion liquid transfer device of the present invention; FIG. 2 is an explanatory diagram showing an overview of a calculation model of a flow in a liquid-sending pipe of the dispersion liquid-sending device of FIG. 1; FIG. 4 is an explanatory diagram showing a cross section of a computational cell in a liquid-sending pipe; FIG. 4 is an explanatory diagram showing a cross section of a computational cell in a body of revolution; It is explanatory drawing which shows the streamline state of the flow in a liquid-sending pipe, FIG. a shows the rotational speed of a rotor at 500 rpm, and FIG. FIG. 2 is an explanatory diagram showing the magnitude and vector of cross-sectional velocity in a cross section perpendicular to the tube axis at 500 rpm and the magnitude of velocity in the direction of the tube axis. , Figure C shows the magnitude and vector of cross-sectional velocity at z = 0.06 m, Figure D at z = 0.04 m, Figure E at 0.02 m, and Figure F at 0.015 m, and the magnitude of velocity in the tube axial direction. FIG. 6 is an explanatory view showing the magnitude and vector of the cross-sectional velocity in the cross section perpendicular to the tube axis and the magnitude of the tube axis direction velocity at 500 rpm in FIG. z = 0.005 m, z = -0.001 m in I diagram, z = -0.005 m in J diagram, z = -0.01 m in K diagram, and z = -0.02 m in L diagram. and the magnitude of the axial velocity. FIG. 3 is an explanatory diagram showing the velocity distribution of the flow at 500 rpm at z=60 mm in FIG. FIG. 3 is an explanatory diagram showing the velocity distribution of the flow at 1000 rpm at z=60 mm in FIG.

In the present invention, a delivery device has a circular pipe portion for feeding a liquid, an upstream opening through which the liquid is introduced into the circular pipe portion, and a downstream opening through which the liquid is discharged out of the circular pipe portion. A rotating body having a liquid pipe, a communication passage arranged to block the circular pipe portion and capable of transferring the liquid from the upstream side to the downstream side, and an outer diameter that does not come into contact with the inner wall diameter of the circular pipe portion. a rotating means for rotating the rotating body coaxially with the axis of the circular pipe portion; It is a dispersing liquid feeding device provided with a supply means for containing.

The communication passage of the rotating body communicates with one or more suction ports provided on the upstream end surface and one or more discharge ports provided on the downstream end surface communicating with the suction ports. The discharge port is arranged at a position closer to the rotation axis of the rotating body than the discharge port, and the discharge port is arranged at a position radially outward from the rotation shaft center than the suction port. As a result, it is possible to uniformly disperse other liquids and fine particle powder while the liquid is being fed, not only for liquids with a viscosity close to that of normal water, but also for liquids with high viscosity, and furthermore, cavitation can be prevented. It has an advantage that is difficult to cause.

That is, for a rotating body having a communication passage arranged to block a circular tube portion and capable of feeding liquid from the upstream side to the downstream side, and an outer diameter that does not come into contact with the inner wall diameter of the circular tube portion, The communication passage of the body communicates with one or more suction ports provided on the upstream end face and one or more discharge ports provided on the downstream end face communicating with the suction ports. The outlet is arranged at a position closer to the rotation axis of the rotating body than the outlet, and the discharge port is arranged at a position radially outward from the rotation axis than the suction port. Therefore, by rotating the rotator, the discharge port is arranged near the side surface of the cylindrical rotator. greater than the centrifugal force to

Therefore, the fluid is discharged from the discharge port, and the liquid enters from the suction port through the communicating passage. Since the rotating body rotates on the rotary shaft, the liquid continuously discharged from the discharge port flows while rotating around the rotary shaft, and not only liquids with a viscosity close to normal water but also highly viscous liquids can be discharged. Even so, it is possible to uniformly disperse the other liquid and the fine particle powder while the liquid is being fed. As for the flow in the circular pipe portion, since it flows while rotating around the rotation axis by the rotating body, it is possible to uniformly disperse other liquids and fine particle powder even in a laminar flow or a turbulent flow. In many cases, even in a state of turbulent flow in the cylindrical portion, the fluid flows while being rotated around the rotation axis by the rotating body. In addition, since there are no blades that create a spiral flow along the rotation axis, there is an advantage that other liquids and fine particle powder can be efficiently and uniformly dispersed without causing cavitation.

As for the liquid to be fed by the dispersion liquid feeding apparatus of the present invention, even a highly viscous liquid can be satisfactorily and uniformly dispersed by the rotating body during liquid feeding. For example, when feeding a viscous liquid close to normal water, it not only disperses the liquid and fine particle powder uniformly, but also accelerates the hardening of the highly viscous synthetic resin when solidifying the adhesive. It is possible to uniformly mix the curing agent, and to uniformly mix the highly viscous soymilk with a coagulant such as bittern while feeding it.

The rotating body used in the dispersion liquid transfer apparatus of the present invention includes a circular pipe portion for feeding a liquid, an upstream opening through which the liquid is introduced into the circular pipe portion, and the circular pipe portion where the liquid is introduced. A communication passage arranged to block a circular pipe portion in a liquid feeding pipe having a downstream opening for sending out to the outside, and capable of feeding the liquid from the upstream side to the downstream side, and the inner wall diameter of the circular pipe portion Any one having an outer diameter that does not come in contact with the inner wall surface of the circular tube portion is preferably used, and a cylindrical body having a side wall portion with a certain gap therebetween is adopted. As a result, since the side surface of the rotating body of the cylindrical body can be arranged with a small gap between it and the inner wall surface of the arranged circular pipe, the amount of liquid that enters through the gap can be reduced. The flow of the liquid continuously ejected from the nozzle flows while rotating around the rotation shaft, and other liquids and fine particle powder can be uniformly dispersed while the liquid is being fed.

One or more suction ports of the present invention are provided on the upstream tank side end face, and one or more discharge ports of the present invention are provided on the downstream tank side end face communicating with the suction port, and the suction port is provided more than the discharge port. It is sufficient that it is arranged at a position close to the rotation axis of the rotating body, and the discharge port is arranged at a position radially outward from the rotation axis than the suction port.

Preferably, two or more suction ports are evenly arranged around the rotation axis on the end face on the upstream tank side, and preferably the discharge ports are the same number as the suction ports on the circular pipe wall surface side on the end face on the downstream tank side. It is sufficient if it has the same number of communication passages as the number of suction ports that connect one suction port and one corresponding discharge port. An embodiment described later discloses that six intake ports and six discharge ports are evenly arranged around the rotation shaft.

FIG. 1 is an explanatory view showing the configuration of one embodiment of the dispersion liquid transfer apparatus of the present invention. As shown in FIG. 1, the dispersion liquid transfer apparatus 10 of the present embodiment is arranged with an upstream opening 11 above a circular tube portion constituting a liquid transfer tube and a bearing 14a of a rotary shaft 14 below the opening. and a downstream opening 12 provided on the side of the circular tube mixing chamber 13. A cylindrical rotating body 20 that rotates about a shaft 14 is arranged.

The outer diameter of the rotating body 20 has a small gap between the side surface of the rotating body 20 and the inner wall of the circular tube mixing chamber 13, and the inner wall surface of the cylindrical tube mixing chamber 13 is arranged. It has an outer diameter that does not touch. The gap between the cylindrical side surface of the rotating body 20 and the inner wall surface of the cylindrical mixing chamber 13 is set to 0.1 mm. By setting the diameter to be at least about 1 mm or less, it is possible to prevent the particles from flowing into the circular tube portion mixing chamber 13 through the gap, and to efficiently disperse the particles in the rotating body 20 .

The cylindrical rotating body 20 has six intake ports 21 provided evenly around the axis of the rotary shaft 14 on the upstream end face, and evenly spaced on the inner wall surface side of the cylindrical mixing chamber 13 on the downstream end face. Each suction port 21 and one corresponding discharge port 23 are communicated with each other by a communication path 22 . Each discharge port 23 is arranged radially outward from the rotation shaft relative to the suction port 21 .

A motor 15 that rotates a rotating shaft 14 via a connecting chamber 18 is arranged below the circular tube portion mixing chamber 13, and the driving shaft 16 of the motor 15 and the rotating shaft 14 can be attached and detached in the connecting chamber 18. It is connected by the connection part 17 which makes. The bearing 14b of the rotating shaft 14 between the circular pipe mixing chamber 13 and the connecting chamber 18 is provided with four seals 19 to prevent the liquid in the circular pipe mixing chamber 13 from leaking into the connecting chamber 18. there is

In the dispersion liquid feeding device 10 of the present embodiment, bittern (bitter) is added to the soymilk as a highly viscous liquid by the bittern supply means 30 to the upstream opening 11 and sucked by the rotating body 20 while being sucked into the cylindrical mixing chamber. By discharging to the 13 side, the liquid is sent to the downstream side opening 12 while being mixed and dispersed in the cylindrical mixing chamber 13 . After the downstream opening 12, tofu is coagulated in a coagulation container, coagulation tank, or the like, and a dispersing liquid feeding device that uniformly mixes a highly viscous synthetic resin with a curing agent that accelerates curing has the same configuration. can be done with

Since the suction port 21 of the rotating body 20 is arranged near the rotary shaft 14 and the discharge port 23 is arranged near the side surface of the rotating body 20, the centrifugal force exerted on the fluid existing inside the discharge port 23 is greater than that of the suction port. 21 is greater than the centrifugal force on the fluid present inside. Therefore, the fluid is discharged from the discharge port 23 and the liquid enters from the suction port 21 through the communicating path 22 . Since the rotating body 20 rotates about the rotating shaft 14, the liquid continuously ejected from the ejection port 23 flows while rotating around the rotating shaft.

Therefore, the liquid is fed by the rotation of the rotating body 20. If the liquid feeding amount of the rotating body 20 alone is enough to obtain a uniform dispersed state, the liquid feeding amount of the rotating body 20 alone is used. If the amount of liquid sent by the rotating body 20 alone is insufficient, such as when a highly viscous liquid is to be sent, a separate liquid sending pump may be added to increase the amount of liquid sent. The tank communicating with the side opening 11 may be arranged at an upper height position, and the downstream opening 12 may be arranged at a lower height position to use the flow of soymilk from the high level to the low level. Also, in the case of adding bittern according to the amount of soymilk fed, by measuring the amount of soymilk fed and adding the amount of bittern corresponding to the total liquid amount with a metering pump, a uniform dispersion state can be obtained. can be obtained.

The agitation flow by the rotor 20 of the dispersion liquid transfer apparatus shown in FIG. 1 was simulated and verified. FIG. 2 is an explanatory diagram showing an overview of a calculation model of the flow in the liquid-sending pipe of the dispersion liquid-sending apparatus of FIG. FIG. 3 is an explanatory diagram showing a cross section of a computational cell in a liquid transfer pipe. FIG. 4 is an explanatory diagram showing a cross section of a computational cell in a body of revolution. Numerical simulation was used to predict the flow generated by the rotating body 20 installed in the circular pipe. As a computing environment, software: open source CFD (Computational Fluid Dynamics) "software Open FOAM v1806" was used.

As shown in FIG. 2, which shows the overall model image, the entire flow path was used as a calculation target. By considering the centrifugal force that simulates the rotation of the rotating body in the entire computational domain, the rotation of the entire computational domain was reproduced. It is treated as a stationary phenomenon that is considered to be observed from a coordinate system that rotates at a constant rotational speed. (SRF Simple Foam) The wall surface of the pipe is stationary, and the rotor and fixed shaft rotate at the specified number of revolutions. The flow path inlet in the simulation was set 100 mm upstream from the bottom surface of the rotating body 20, and the velocity (flow rate/pipe cross-sectional area) was uniform throughout the inlet. Also, the outlet of the flow path was set 200 mm downstream from the upper surface of the rotating body 20 .

FIG. 3 shows an outline of a computational cell for a cross section inside a circular pipe (z=60 mm), and FIG. 4 shows an outline of a computational cell for a cross section of a hole in a rotating body. The reference cell size (length of one side) is 2 mm. If necessary, the cell was divided in half and subdivided. Two boundary layers were added near the walls. The total number of cells resulted in about 750,000.

Calculation conditions are as follows. The flow rate Q was set to 50 L/min. That is, the pipe inlet area is S (ignoring the reduction in the area of the rotating shaft), and the average flow velocity is Q/S (= 4Q/PI/D^2) = 0.4244 m/s (uniform velocity is given to the pipe inlet ). The Reynolds number Re=2.6×10 ⁴ (considered as turbulent flow). The rotation of the rotor 20 was assumed to be 500 rpm or 1000 rpm (500/60=8.3 rounds per sec). The equivalent rotational speed was about 0.5 m/s at a radius of 0.01 m, and about ^1.3 m/s at a radius of 0.025 m. The turbulence model was a Reynolds-averaged k-ω SST turbulence model (swirling not considered).

5A and 5B are explanatory diagrams showing the streamline state of the flow in the liquid feeding pipe, in which FIG. 5A shows the rotational speed of the rotating body at 500 rpm, and FIG. As for the overall flow, as shown in FIG. 5, upstream of the rotating body 20, the flow is mainly in the direction of the pipe axis because the flow is turbulent. If there is no rotating body, even if bittern or the like is added to the turbulent flow by the bittern supply means 30, a flow of a suitable length is required to obtain a uniformly dispersed state. .

However, after passing through the rotating body 20, it was found that the entire flow path rotates at both 500 rpm and 1000 rpm, and a swirling flow occurs throughout the circular pipe portion. It was believed that this swirling flow over the whole would provide a uniform dispersion. Therefore, in a simulation of a turbulent flow with water as the kinematic viscosity, a swirling flow is generated throughout the circular pipe, so it is necessary to change the rotation speed as appropriate even for soy milk with high viscosity. Therefore, it was expected that a swirl flow would occur throughout the circular pipe.

FIG. 6 is an explanatory diagram showing the magnitude and vector of the cross-sectional velocity in the cross section perpendicular to the tube axis at 500 rpm in FIG. 2 and the magnitude of the velocity in the direction of the tube axis. = 0.08m, z = 0.06m in C, 0.04m in D, 0.02m in E, and 0.015m in F, the magnitude and vector of cross-sectional velocity, and the magnitude of velocity in the tube axial direction. FIG. 7 is an explanatory diagram showing the magnitude and vector of the cross-sectional velocity in the cross section perpendicular to the tube axis at 500 rpm in FIG. Figure H: z = 0.005 m, Figure I: z = -0.001 m, Figure J: z = -0.005 m, Figure K: z = -0.01 m, Figure L: z = -0.02 m. The vector and the magnitude of the tube axial velocity are shown.

As shown in FIGS. 6 and 7, which show the magnitude of velocity in the direction of the tube axis and the magnitude of velocity in the inward direction of the cross section in a cross section perpendicular to the tube axis, before passing through the rotating body 20, It flows straight ahead (L diagram, K diagram, J diagram). It was found that when the fluid entered the inlet 21 of the rotating body 20 (Fig. I), the fluid flow area decreased, so that the velocity of the fluid increased. Incidentally, this flow flows along the communication path 22 .

Due to the rotation of the rotating body 20, the fluid in this portion obtains a rotation component corresponding to the rotation speed (Fig. H, Fig. G, Fig. F). The flow coming out of the discharge port 23 of the rotating body 20 collides with the inner wall surface of the cylindrical portion while maintaining its momentum (Fig. E). It was found that a swirling flow was generated throughout the circular tube portion, although the rotation component weakened slightly away from the rotating body 20 (Figs. D, C, B, and A).

FIG. 8 is an explanatory diagram showing the velocity distribution of the flow at 500 rpm at z=60 mm in FIG. FIG. 9 is an explanatory diagram showing the velocity distribution of the flow at 1000 rpm at z=60 mm in FIG.

8 and 9, which show the comparison of the speed distribution in the cross section of z=60 mm, it was found that the turning speed in the cross section increased as the rotation speed increased.

10 ... Dispersion liquid transfer device,
11 ... upstream opening,
12 ... downstream opening,
13 … Circular pipe portion mixing chamber (circular pipe portion),
14 ... rotating shaft,
14a ... bearing,
14b ... bearing,
15 ... motor,
16 ... drive shaft,
17 ... connection part,
18 ... connection room,
19 ... seal part,
20 ... rotating body,
21 ... suction port,
22 ... communicating path,
23 ... discharge port,
30 bittern supply means (supply means),

Claims (2)

A liquid-sending tube having a circular pipe portion for feeding a liquid, an upstream opening through which the liquid is introduced into the circular pipe portion, and a downstream opening through which the liquid is sent out of the circular pipe portion. and,
a rotating body disposed so as to block the circular pipe portion and having a communication passage capable of feeding the liquid from the upstream side to the downstream side, and an outer diameter that does not come into contact with the inner wall diameter of the circular pipe portion;
a rotating means for rotating the rotating body coaxially with the axis of the circular tube;
A dispersion liquid feeding device comprising a supply means for supplying a liquid to be dispersed or a fine particle powder to be dispersed into a liquid flowing in a liquid feeding pipe on the upstream side or downstream side of the rotating body,
The communication passage of the rotating body is
one or more inlets provided on the upstream end surface;
It communicates with one or more discharge ports provided on the downstream end face communicating with the suction port,
the suction port is arranged at a position closer to the rotational axis of the rotating body than the discharge port;
The dispersion liquid feeding device, wherein the discharge port is arranged radially outward from the rotation axis relative to the suction port. 2. The dispersion liquid transfer apparatus according to claim 1, wherein the rotating body is a cylindrical body having a side wall portion with a certain gap on the inner wall surface of the arranged circular tube portion.

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