JP7261363B1 - stirrer - Google Patents

Abstract

Kind Code: A1 A stirrer equipped with a pump having excellent ability to transfer a stirred object is provided. A stirring tank having a bottom and a side wall, a stirring blade rotating in the stirring tank, and a pump positioned below the stirring tank and connected to the stirring tank via a communication path for transporting the object to be stirred. and wherein the pump comprises a pump tank and a pump blade that rotates in the pump tank, the pump tank is connected to the bottom of the stirring tank, and stirs bubbles generated in the pump tank. It is characterized by having a foam discharging path for discharging from the bottom of the tank into the agitating tank. [Selection drawing] Fig. 4

Description

The present invention relates to a stirring device.

2. Description of the Related Art A stirring device having stirring blades is used as a device for stirring, such as dispersing and mixing, a target object such as a liquid or a mixture of powder and liquid. Patent Literature 1 discloses an example of a conventional stirring device. In the configuration disclosed in this document, a stirring blade is attached to the tip of a rotating shaft that is driven to rotate. The stirring blade performs stirring such as dispersion and mixing of the target object by being rotated within the stirring container containing the target object.

In addition, the stirring device of Patent Document 1 has a function of returning the stirring target discharged from the bottom of the stirring tank to the inside of the stirring tank from the top of the stirring tank via an external pipe. is provided with a liquid feeding mechanism consisting of a pump.
Externally circulating the object to be stirred via the external pipe in this manner has the advantage of preventing the object to be stirred from becoming stagnant in the stirring tank.
As the pump installed in the middle of the external piping, an involute type pump as shown in FIG. 9 is often used.
However, since the involute type pump has a complicated structure, it generally tends to be expensive, and if it is used as a component device, the cost performance of the entire device is lowered.

In order to solve this problem, instead of the involute pump, as shown in FIG. The solution is to use a certain type of pump.
This type of pump has a relatively simple structure and is therefore inexpensive, and if it is used as a constituent device, it has the advantage of improving the cost performance of the entire device.

JP 2006-205071 A

However, the pump of the above type has a low discharge performance for bubbles contained in the suction liquid and bubbles generated in the pump tank due to cavitation. There is a problem of lowering

In order to solve this problem, in the present invention, a stirring tank having a bottom and side walls, a stirring blade that rotates in the stirring tank, and a communication path that is positioned below the stirring tank and conveys the object to be stirred. a pump connected to the stirring vessel via a and a foam discharge path for discharging foam generated in the pump tank from the bottom of the stirring tank into the stirring tank, wherein the foam discharge path is connected to the bottom of the stirring tank in the stirring tank It has a protruding part protruding toward the upper part of the agitation tank from (Claim 1).
Preferably, in the pump, the pump tank is cylindrical, and the center axis of the pump tank and the axis of the pump blades are in a concentric positional relationship (Claim 2).
Preferably, at the bottom of the agitation tank, a first flow to be agitated from the radially outer side of the agitation tank toward the communication path and a flow to be agitated from the radially outer side of the agitation tank toward the agitating blade is generated in layers, said first flow generated adjacent to the bottom of said stirred vessel, said second flow generated adjacent to said first flow, said The tip of the protruding portion is located above the stirring vessel above the first flow (Claim 3 ).
More preferably, when the height from the bottom of the stirring tank to the position where the stirring blade is arranged is Hw, and the height of the protrusion is Hb, the relationship 1/3Hw<Hb is satisfied (claim 4 ).
Further, preferably, the stirring blade includes a base portion attached to the rotating shaft of the stirring device, and a plurality of blade portions radially attached to the base portion, and the blade portions are connected to the base portion. A first angle formed between the circumferential direction and the root portion includes a root portion and a tip portion connected to the root portion on the side opposite to the base portion. It is inclined so as to be positioned on one side, and the absolute value of the third angle, which is the angle formed by the radial direction and the tip portion, is 60° or more and 100° or less, and when viewed in the axial direction, the circumferential direction and the tip portion The absolute value of the fourth angle, which is the angle formed by the 5 ).
More preferably, the stirring blade includes a base attached to the rotating shaft of the stirring device, and a plurality of blades radially attached to the base, and the blade has a root connected to the base. and a tip portion connected to the root portion on the side opposite to the base portion, wherein the first blade portion has an angle formed between the circumferential direction and the root portion. One angle is inclined so that it is located on one side in the axial direction as it goes forward in the circumferential direction, and the absolute value of the third angle, which is the angle between the radial direction and the tip portion, is 60° or more and 100° or less. The absolute value of the fourth angle, which is the angle formed between the circumferential direction and the tip portion in the axial direction, is positive when it is inclined so as to be located radially inward toward the front in the circumferential direction. The angle is 0° or more and 25° or less, and the plurality of blade portions includes a second blade portion disposed between two adjacent first blade portions, and the second blade portion has a boundary portion. It is connected to the base portion through the base portion, and is flat as a whole (Claim 6 ).
More preferably, the stirring blade is capable of rotating in both the forward direction and the reverse direction. from the agitation blades and from the agitation blades to the outside in the radial direction of the agitation vessel (claim 7 ).

As described above, if the pump tank is connected to the bottom of the agitation tank and has a foam discharge path for discharging bubbles in the pump tank into the agitation tank, bubbles in the sucked liquid and cavitation will cause the pump tank to collapse. The foam generated inside can be discharged to the stirring tank via the foam discharging path, and the problem that the foam in the pump tank significantly lowers the stirring object transfer ability of the pump can be avoided.

In addition, when the pump is of a type in which the shape of the pump tank is cylindrical and the central axis of the pump tank and the axis of the pump blades are in a concentric positional relationship, the discharge performance of bubbles in the pump tank is poor. As a result, the problem that the ability of the pump to transfer the object to be agitated is greatly reduced becomes particularly conspicuous.

Furthermore, if the foam discharging path has a projection projecting from the bottom of the stirring tank toward the top of the stirring tank in the stirring tank, the foam is discharged from the pump tank into the stirring tank via the foam discharging path. It is possible to avoid a situation in which the generated bubbles ride on the flow of the object to be stirred that flows into the pump tank from the stirring tank via the communication path and flow into the pump tank again.
Specifically, at the bottom of the stirring vessel, a first flow to be stirred toward the communication path from the radially outer side of the stirring vessel and a second flow to be stirred toward the stirring blades from the radially outer side of the stirring vessel. Since the flows are laminar, the first flow is generated adjacent to the bottom of the agitated vessel and the second flow is generated adjacent to the first flow, foam discharge By arranging the tip of the protrusion of the path above the first flow, the bubbles discharged from the tip of the protrusion are diffused into the agitation tank by the action of the stirring blade, and are discharged. Therefore, it is possible to avoid a situation in which the bubbles gather together and flow into the pump tank.
At this time, when the height from the bottom of the stirring tank to the position where the stirring blade is arranged is Hw, and the height of the protrusion of the foam discharging path is Hb, the relationship 1/3Hw<Hb is satisfied. , the tip of the protrusion of the foam discharge path can be positioned generally above the first flow.

Further, the stirring blades include a base attached to the rotating shaft of the stirring device and a plurality of blades radially attached to the base. and a tip portion connected to the side opposite to the base portion, and the first angle, which is the angle formed by the circumferential direction and the root portion, is inclined so as to be located on one side in the axial direction toward the front in the circumferential direction, The absolute value of the third angle, which is the angle between the radial direction and the tip, is 60° or more and 100° or less, and the fourth angle, which is the angle between the circumferential direction and the tip when viewed in the axial direction, is the circumferential direction. Assuming that the angle is positive when it tilts toward the inside in the radial direction toward the front, when the absolute value is 0° or more and 25° or less, the stirring is performed directly above the bottom of the stirring tank. The first flow of the material to be stirred toward the connecting pipe from the radially outer side of the tank does not occur, and the foam discharged from the pump tank into the stirring tank via the foam discharging path is discharged from the stirring tank into the connecting pipe. It is possible to avoid a situation in which the material to be stirred flows into the pump tank again by following the flow of the material to be stirred that flows into the pump tank via the .
As a result, it is not necessary to provide a protrusion in the foam discharge path or to arrange the tip of the protrusion above the first flow.
Further, the stirring blades include a base attached to the rotating shaft of the stirring device and a plurality of blades radially attached to the base. and a tip portion connected to the side opposite to the base portion, and the first blade portion has an axial direction as the first angle formed by the circumferential direction and the root portion goes forward in the circumferential direction. It is inclined so as to be positioned on one side, and the absolute value of the third angle, which is the angle formed by the radial direction and the tip portion, is 60° or more and 100° or less, and the circumferential direction and the tip portion are in an axial view. The fourth angle, which is the angle to be formed, has an absolute value of 0° or more and 25° or less when positive is the case where the angle is inclined so as to be radially inward toward the front in the circumferential direction, and the plurality of blade portions includes a second blade portion disposed between two adjacent first blade portions, and when the second blade portion is flat as a whole, the tip portion of the first blade portion Bubbles present in the vicinity exhibit behavior such that they are drawn toward the second blade portion as they pass through the second blade portion.
As a result, the phenomenon that bubbles continuously stay in the vicinity of the tip portion is suppressed, and the deterioration of the dispersing ability of the stirring blade can be avoided.
As a result, even if the bubbles discharged from the pump tank into the stirring tank via the foam discharging path reach the stirring blades, the problem of deterioration of the dispersing ability of the stirring blades can be avoided.

Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

1 is a configuration diagram showing a stirring device according to Example 1 of the present invention; FIG. 4 is a top view showing the bottom of the stirring tank of the stirring device according to Example 1 of the present invention; FIG. Fig. 2 is a perspective view showing a stirring blade attached to the stirring device according to Example 1 of the present invention; 4 is an enlarged view showing the bottom of the stirring tank of the stirring device according to Example 1 of the present invention; FIG. FIG. 2 is a configuration diagram showing a stirring device according to Example 2 of the present invention; Fig. 10 is a perspective view showing a stirring blade attached to a stirring device according to Example 2 of the present invention; 4 is an enlarged view showing the bottom of the stirring tank of the stirring device according to Example 1 of the present invention; FIG. FIG. 4 is a schematic diagram showing a pump attached to the stirring device according to the present invention; FIG. 3 is a schematic diagram showing a pump according to a conventional example;

Preferred embodiments of the present invention will be specifically described below with reference to the drawings.
(Example 1)
FIG. 1 shows an embodiment of a stirring device B1 according to Example 1 of the present invention.
The stirring device B1 of this embodiment includes a stirring vessel 7, a stirring blade A1, a rotating shaft 4, and a motor 5.
The stirring container 7 is a container for accommodating a stirring target material (stirring target) 8 and stirring the stirring target material 8 .
In this embodiment, the stirring container 7 has a stirring tank 71 , a lid portion 72 and a plurality of baffles 76 .
The stirring tank 71 is a main part that stores the stirring target material 8 and stirs the stirring target material 8 . Agitation tank 71 has a bottom portion 711 and a side wall portion 712 . The bottom portion 711 is the lower end portion of the stirring vessel 71, and in the illustrated example, has a curved shape that slightly bulges downward. However, the shape of the bottom portion 711 is not particularly limited, and may be flat. The side wall portion 712 extends upward from the bottom portion 711 and has a cylindrical shape.
Note that the axial direction z in the drawing is parallel to the central axis of the cylindrical side wall portion 712 and corresponds to the vertical direction in this embodiment.
The lid portion 72 closes the stirring vessel 71 from above, and is for maintaining the airtightness of the stirring vessel 7, for example.

A plurality of baffles 76 are arranged along the bottom portion 711 within the stirring vessel 71 . The plurality of baffles 76 have the function of preventing excessive air intake vortices from being generated in the material 8 to be stirred due to the rotation of the stirring blade A1.
Further, the shape of the baffle 76 is not particularly limited, and may be a shape having a curved surface, a linear shape in plan view, or a curved shape.
In addition, in the present invention, the plurality of baffles 76 are not essential for exhibiting the effects of the invention, and can be arranged as necessary.

The stirring blade A1 is for stirring the material to be stirred 8 contained in the stirring tank 71, and generates a flow such as a swirling flow capable of stirring the material to be stirred 8 by rotating.
The stirring blade A1 rotates in both the forward rotation direction F and the reverse rotation direction R, as shown in FIG.

FIG. 3 shows a stirring blade A1, which is an example of the stirring blade used in this embodiment.
The stirring blade A1 of this embodiment has a base portion 1 and a plurality of blade portions 2A and 2B.
The base 1 is flat and disc-shaped. A plurality of blade portions 2A and 2B are arranged near the outer peripheral edge of the base portion 1 .
The plurality of blade portions 2A are substantially trapezoidal flat plates that protrude upward in the axial direction z from the base portion 1 . The plurality of blade portions 2B are substantially trapezoidal flat plates projecting downward in the axial direction z from the base portion 1 . The plurality of blade portions 2A and the plurality of blade portions 2B are alternately arranged along the circumferential direction θ.
Such a stirring blade A1 can be formed, for example, by cutting and bending a metal plate.

The rotating shaft 4 is a shaft for rotating the stirring blade A1. The rotary shaft 4 is inserted through the bottom portion 711 and is attached with the stirring blade A1.
In the illustrated example, a stirring blade A1 is fixed to the upper end of the rotating shaft 4. As shown in FIG. In this embodiment, the center of the stirring tank 71 and the rotating shaft 4 are aligned, but they may not be aligned.

The motor 5 is a drive source that rotates the rotating shaft 4 . The motor 5 may be directly connected to the rotating shaft 4, or may be connected via a gear (not shown).
The motor 5 rotates the rotary shaft 4 in both the forward rotation direction F and the reverse rotation direction R. As a result, the stirring blade A1 rotates in both the forward rotation direction F and the reverse rotation direction R.

Further, the stirring device B 1 has a pump tank 73 , pump blades 3 , a connecting line (connecting line) 74 and a reflux line 75 .
The pump tank 73 is provided below the stirring tank 71 , and the center of the pump tank 73 in plan view coincides with the center of the stirring tank 71 in plan view.
Further, the pump tank 73 is cylindrical, and the central axis of the pump tank 73 and the axis of the pump blades 3 (rotating shaft 4) are in a concentric positional relationship.

The connecting pipe line 74 connects the bottom portion 711 of the stirring tank 71 and the pump tank 73 . The connecting pipe line 74 has a short tubular shape, and its center in plan view coincides with the center in plan view of the stirring tank 71 and the pump tank 73 .
The reflux line 75 is a path for returning the liquid that has flowed out from the bottom portion 711 to the stirring tank 71 via the outside of the stirring tank 71 . The return line 75 is connected to the side of the pump tank 73 .
In the illustrated example, the return line 75 has a side injection port 751 , a top injection port 752 , a spraying portion 753 and a valve portion 754 .
The side injection port 751 is connected to the side wall portion 712 of the stirring tank 71 and is a part through which the recirculated liquid flows into the stirring tank 71 from the side.
The top-side injection port 752 is provided above the stirring tank 71 , and is provided through the lid portion 12 in the illustrated example.
The top-side injection port 752 is a portion through which the recirculated liquid flows into the stirring tank 71 from above.

The spraying part 753 is attached to the top-side injection port 752 and has a function of washing the inside of the stirring tank 71 by spraying the liquid flowing from the top-side filling port 752 into the stirring tank 71 . It is a shower ball (washing nozzle).
The valve part 754 is for selectively returning the liquid to either the side injection port 751 or the top injection port 752, and is configured by a three-way valve or the like, for example.

The pump vanes 3 are for sucking the liquid in the stirring vessel 71 through the connecting conduit 74 and sending it to the reflux conduit 75 .
The pump impeller 3 is attached to a rotating shaft 4 and rotates in both the forward rotation direction F and the reverse rotation direction R. As shown in FIG.

The illustrated example has a main plate 31 and a plurality of blade plates 32 as pump blades 3 .
The main plate 31 is, for example, a disk-shaped member and is made of metal such as stainless steel.
The plurality of blade plates 32 are made of metal such as stainless steel, and are fixed to the upper surface of the main plate 31 .

A usage example of the stirring device B1 will be described.
First, the case where normal stirring is performed in the stirring device B1 will be described. In this case, the valve portion 754 opens the path toward the side inlet 751 and closes the path toward the top inlet 752 . That is, the path P1 in the drawing is selected.
Simultaneously with stirring by the stirring blade A1, the stirring target material 8 is sucked from the center of the pump blade 3 due to the rotation of the pump blade 3, and the stirring target material 8 is sucked into the return pipe 15 positioned radially outward of the pump blade 3. Dispensed.
The material 8 to be stirred is injected into the stirring tank 71 from the side injection port 751 through the return line 15 . This circulation of the object material 8 can prevent the object material 8 from stagnating in the agitation tank 71 .

Next, the case of cleaning the inside of the stirring container 7 in the stirring device B1 will be described.
In this case, the valve portion 754 closes the path toward the side inlet 751 and opens the path toward the top inlet 752 . That is, the path P2 in the drawing is selected.
Further, instead of the material 8 to be stirred, the stirring tank 71 contains a cleaning liquid. The cleaning liquid is a liquid for cleaning the material to be stirred 8 and the like adhering to the inside of the stirring container 7 .
By rotating the motor 5 in this state, the stirring blade A1 and the pump blade 3 are rotated. As a result, the cleaning liquid stored in the stirring tank 71 is caused to swirl by the stirring blades A1, and the cleaning liquid is sent to the top-side injection port 752 through the return pipe 75 by the pump blades 3. The spraying portion (shower ball) 753 provided is sprayed toward the entire inside of the stirring container 7 to wash the inside of the stirring container 7 .

Next, a mechanism for discharging bubbles generated by cavitation in the pump tank 73 and bubbles flowing into the pump tank 73 from the communication pipe line 74 will be described.
As shown in FIGS. 1 and 4, one end of a foam discharge path 731 for discharging bubbles in the pump tank into the stirring tank 71 is connected to the upper portion of the pump tank 73, and the other end of the foam discharge path 731 is connected to the upper part of the pump tank 73. is connected to the bottom 711 of the stirring tank 71 .
Further, the foam discharging path 731 extends into the stirring tank 71 and forms a protruding part 732 that protrudes from the bottom part 711 of the stirring tank 71 toward the upper part of the stirring tank 71 .
As a result, the foam in the pump tank 73 is transferred to the stirring tank 71 through the foam discharge path 731 by the differential pressure between the pump tank 73 and the stirring tank 71 , and the opening provided at the tip of the projecting part 732 in the stirring tank 71 . is discharged into the stirring tank 71 from the
As a result, it is possible to avoid the problem that bubbles accumulate in the pump tank 73 and greatly reduce the ability of the pump to transfer the agitated object.

In addition, as described above, the foam discharging path 731 has the projecting portion 732 projecting from the bottom portion 711 of the stirring tank 71 toward the upper portion of the stirring tank 71 in the stirring tank 71 . The foam discharged into the stirring tank 71 through the foam discharging path 731 rides on the flow of the stirring target material 8 flowing from the stirring tank 71 into the pump 73 tank via the connecting pipe 74, and then returns to the pump tank. 73 can be avoided.
Specifically, as shown in FIG. 4, immediately above the bottom portion 711 of the stirring tank 71, the first flow of the stirring target material 8 from the radially outer side of the stirring tank 71 toward the connecting conduit 74 and the stirring flow A second flow of the material to be stirred 8 is generated in layers from the radially outer side of the tank 71 toward the stirring blade A1. is generated tangential to the first flow.
Therefore, if the tip of the projecting portion 732 of the foam discharging path 731 is arranged above the first flow, the foam discharged from the tip of the projecting portion 732 into the stirring tank 71 will be discharged from the stirring blade A1. It is possible to avoid a situation in which the bubbles diffused into the agitating tank 71 and discharged into the agitating tank 71 and flow into the pump tank 73 together.

At this time, when the height from the bottom portion 711 of the stirring tank 71 to the position where the stirring blade A1 is arranged is Hw, and the height of the projecting portion 732 is Hb, the relationship 1/3Hw<Hb is satisfied. , the tip of the projecting portion 732 of the foam discharging path 731 can be arranged substantially above the first flow, which is preferable.

(Example 2)
FIG. 5 shows an embodiment of a stirring device B2 according to Example 2 of the present invention.
The stirring device B2 of the present embodiment includes the stirring blade A2, and does not include the projecting portion 732 projecting from the bottom portion 711 of the stirring tank 71 toward the upper portion of the stirring tank 71. It is the same as the stirring device B1 according to 1.

FIG. 6 shows a stirring blade A2, which is an example of the stirring blade used in this embodiment.
The stirring blade A2 of the present embodiment is provided with a mounting hole 201 in the base portion 200 as a structure for mounting the stirring blade A2 on the rotating shaft 4 .
The base portion 200 of the present embodiment has a plate-like shape along the radial direction r and the circumferential direction θ and perpendicular to the axial direction z.
The base portion 200 has two first blade portions 2C and two second blade portions 2D each having the same shape and radially attached to the base portion 200, and the blade portions are alternately arranged in the circumferential direction θ.
The numbers of the first blade portion 2C and the second blade portion 2D are not limited at all, and can be increased or decreased as required.

The first blade portion 2C has a root portion 202 and a tip portion 203. As shown in FIG. The root portion 202 is connected to the base portion 200 and obliquely extends upward in the axial direction z with respect to the base portion 200 .
The tip portion 203 is connected to the root portion 202 on the side opposite to the base portion 200, and extends upward in the axial direction z from the root portion 202 in the illustrated example.
The base portion 200, the root portion 202, and the tip portion 203 may be integrally formed from a single material, or may be joined together by engaging (fitting) such as insertion or joining techniques such as welding. may have been
In the stirring blade A2, the base portion 200 and the first blade portion 2C and the second blade portion 2D are formed by cutting and bending an integral metal plate material.
Accordingly, a first boundary portion 204 is provided at the boundary between the base portion 200 and the root portion 202 , and a second boundary portion 205 is provided at the boundary between the root portion 202 and the tip portion 203 .
In addition, in the first blade portion 2C, the absolute value of the angle (first angle) formed by the circumferential direction θ and the root portion 202 is 5° or more and 50°, and the radial direction r and the root portion 202 (the center line of the root portion 202) The absolute value of the angle (second angle) formed by the two is 0° or more and 50° or less, and the angle (third angle) is 60° or more and 100° or less, and the absolute value of the angle (fourth angle) between the circumferential direction θ and the distal end portion 203 in the axial direction z is set to be 0° or more and 25° or less. ing.
Here, the first angle is positive when it is tilted toward one side (upper side in the figure) in the axial direction z toward the rotational front in the circumferential direction θ, and the second angle is positive when it is positioned radially outward. The case where it is tilted to the one side in the axial direction z (upper side in the drawing) is positive, and the third angle is the case where it tilts to the one side in the axial direction z (upper side in the drawing) as it is positioned radially outward. is positive, and the fourth angle is positive when it is tilted inward in the radial direction r toward the rotational front in the circumferential direction θ.
Furthermore, in the first blade portion 2C, the absolute value of the angle (first minor angle) formed by the radial direction r and the first boundary portion 204 (the center line of the first boundary portion 204) when viewed in the axial direction z is 20°. Above 80° and below, the absolute value of the angle (second minor angle) formed by the radial direction r and the second boundary portion 205 (the center line of the second boundary portion 205) when viewed in the axial direction z is larger than the first minor angle. is set to be
Here, the first minor angle and the second minor angle are positioned outward in the radial direction r as the first boundary portion 204 and the second boundary portion 205 go rearward in the axial direction z (rotational direction) when viewed in the axial direction z. A positive value is given when it is tilted in this way, and a negative value is given when it is vice versa. The first minor angle and the second minor angle are inclined so that the first boundary portion 23 and the second boundary portion 24 are positioned radially outwardly r as they go rearward in the axial direction z (rotational direction) when viewed in the axial direction z. It takes a positive value when the The first minor angle β1 and the second minor angle β2 are set so that the first boundary portion 23 and the second boundary portion 24 are positioned more radially outward in the axial direction z (rotational direction) toward the rear in the axial direction z. It takes a positive value when it is tilted toward

On the other hand, the second blade portion 2D is connected to the base portion 1 via the boundary portion 206 and has a flat shape as a whole.
In addition, the second blade portion 2D has an absolute value of an angle (fifth angle) between the average center line based on the overall shape and the radial direction r of 0° or more and 50° or less, and The absolute value of the angle (third minor angle) formed by the third boundary portion 206 with the second blade portion 2D and the radial direction r is set to 20° or more and 80° or less.
Here, the fifth angle is positive when it is inclined so that it is positioned on one side (upper side in the figure) in the axial direction z as it is positioned radially outward, and the third minor angle is defined as the first boundary when viewed in the axial direction z. A positive value is given when the portion 204 and the second boundary portion 205 are tilted so as to be located radially outward in the axial direction z (rotational direction) toward the rear, and the opposite case is negative.
The definitions of the first to fifth angles and the first to third sub-angles follow the description of Japanese Patent Application No. 2020-133639.

As shown in FIG. 6, the stirring blade A2 can rotate in both the forward rotation direction F and the reverse rotation direction R. When rotating in the reverse rotation direction R, as shown in FIG. Directly above the bottom portion 711 of the stirring vessel 71, the material 8 to be stirred is caused to flow from the stirring blade A2 toward below the stirring blade A2 and from the stirring blade A2 toward the outside in the radial direction of the stirring vessel 71.
As a result, directly above the bottom portion 711 of the stirring tank 71 , the first flow of the stirring target material 8 from the radially outer side of the stirring tank 71 toward the connecting pipe 74 does not occur, and the foam discharge path 731 from the pump tank 73 does not occur. The foam discharged into the agitation tank 71 via the pipe line 74 flows into the pump tank 73 again with the flow of the material to be agitated 8 flowing from the agitation tank 71 through the connecting pipe line 74 into the pump tank 73. You will be able to avoid situations such as
As a result, in the stirring device B2 according to the second embodiment of the present invention, the foam discharging path 731 is provided with the projecting portion 732 as in the stirring device B1 according to the first embodiment, or the projecting portion 732 is provided as shown in FIG. No provision is made to ensure that the tip of the is positioned above the first stream.

Further, the stirring blade A2 behaves such that bubbles existing near the tip 203 of the first blade 2C are drawn toward the second blade 2D as the second blade 2D passes through. As a result, it is possible to suppress the phenomenon that the bubbles continuously stay in the vicinity of the tip portion 203, and avoid the deterioration of the dispersing ability of the stirring blade A2.
As a result, even if the bubbles discharged into the stirring tank 71 from the pump tank 73 through the bubble discharging path 731 reach the stirring blade A2, the problem of the deterioration of the dispersion ability of the stirring blade A2 can be avoided.

The stirring device according to the present invention is not limited to the embodiments described above. The specific configuration of each part of the stirring device according to the present invention can be changed in various ways.

A1, A2: Stirring blades B1, B2: Stirrer 1: Base 2A, 2B: Blade 2C: First blade 2D: Second blade 3: Pump blade 4: Rotating shaft 5: Motor 7: Stirring vessel 8: Stirring target material 31 : Main plate 32 : Blade plate 71 : Stirring tank 72 : Lid 73 : Pump tank 74 : Connection pipe 75 : Circulation pipe 76 : Baffle 200 : Base 201 : Mounting hole 202 : Root 203 : Tip 204: first boundary portion 205: second boundary portion 206: third boundary portion 731: foam discharge path 732: projecting portion 751: side injection port 752: top side injection port 753: spraying portion 754: valve portion 711: bottom portion 712: Side wall portions P1, P2: Path F: Forward rotation direction R: Reverse rotation direction r: Radial direction θ: Circumferential direction z: Axial direction

Claims (7)

an agitation vessel having a bottom and side walls;
a stirring blade that rotates in the stirring tank;
a pump positioned below the stirring tank and connected to the stirring tank via a communication path for transferring an object to be stirred;
A stirring device comprising
The pump comprises a pump tank and a pump vane that rotates in the pump tank,
The pump tank is connected to the bottom of the stirring tank and has a foam discharge path for discharging bubbles generated in the pump tank from the bottom of the stirring tank into the stirring tank ,
The foam discharging path has a protruding portion that protrudes from the bottom of the agitating tank toward the top of the agitating tank in the agitating tank.
A stirring device characterized by: 2. The agitator according to claim 1, wherein the pump has a cylindrical pump tank, and the central axis of the pump tank and the axial center of the pump blades are in a concentric positional relationship. . At the bottom of the stirring tank, a first flow to be stirred from the radially outer side of the stirring tank toward the communication path and a second flow to be stirred from the radially outer side of the stirring tank toward the stirring blade. is occurring in layers,
wherein the first stream occurs adjacent to the bottom of the stirred vessel and the second stream occurs adjacent to the first stream;
2. The agitator according to claim 1 , wherein the tip of said projecting portion is located above said first flow in said agitation tank. When the height from the bottom of the stirring tank to the position where the stirring blade is arranged is Hw, and the height of the protrusion is Hb,
2. The stirrer according to claim 1 , wherein the relationship 1/3Hw<Hb is satisfied. The stirring blade is
a base attached to the rotating shaft of the stirring device;
a plurality of blades radially attached to the base,
The blade portion includes a root portion connected to the base portion, and a tip portion connected to the base portion on the side opposite to the base portion,
A first angle formed by the circumferential direction and the root portion is inclined so as to be located on one side in the axial direction toward the front in the circumferential direction,
The absolute value of the third angle, which is the angle between the radial direction and the tip portion, is 60° or more and 100° or less,
The absolute value of the fourth angle, which is the angle between the circumferential direction and the distal end portion when viewed in the axial direction, is 0 when positive is the case where the tilt is radially inward toward the front in the circumferential direction. 25° or more and 25° or less. The stirring blade is
a base attached to the rotating shaft of the stirring device;
a plurality of blades radially attached to the base,
The blade portion includes a first blade portion having a base portion connected to the base portion and a tip portion connected to the base portion on the opposite side of the base portion,
The first blade portion is
The first angle formed by the circumferential direction and the root portion is inclined so that the first angle is located on one side in the axial direction toward the front in the circumferential direction,
The absolute value of the third angle, which is the angle between the radial direction and the tip portion, is 60° or more and 100° or less,
The absolute value of the fourth angle, which is the angle between the circumferential direction and the distal end portion when viewed in the axial direction, is 0 when positive is the case where the tilt is radially inward toward the front in the circumferential direction. ° or more and 25 ° or less,
The plurality of blade portions includes a second blade portion arranged between two adjacent first blade portions,
2. The stirrer according to claim 1, wherein said second blade portion is connected to said base portion via a boundary portion, and is flat as a whole. The stirring blade is
It is possible to rotate in both forward and reverse directions,
When rotating in the reverse direction, the object to be stirred is caused to flow from the stirring blade to below the stirring blade and from the stirring blade to the outside in the radial direction of the stirring tank immediately above the bottom of the stirring tank. The stirring device according to claim 1, wherein

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