JP2012157841A - Circulation structure of agitating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circulation structure of an agitating device which does not need a circulation pump.SOLUTION: The circulation structure includes: a pair of agitation blades arranged at a bottom part of an agitation tank; the bottom part of the agitation tank; and circulation piping communicating with a side part or an upper part of the agitation tank. One of the pair of agitation blades flows an agitation object from the bottom part side toward the upper part side of the agitation tank at the bottom part of the agitation tank. The other agitation blade of the pair of agitation blades fluidizes the agitation object from the bottom part toward the circulation piping.

Description

  The present invention relates to a circulation structure of a stirring device.

  As a circulation structure of a conventional stirring apparatus, a circulation structure as disclosed in Patent Document 1 is disclosed. The circulation structure 100 includes a liquid outlet 102 at the lower part of the dissolution tank 101 as shown in FIG. 5, a pipe having one end connected to the liquid outlet 102 and the other end connected to the upper part of the dissolution tank 101. In 103, the solvent to be agitated and the polymer powder are circulated. The pipe 103 is provided with a circulation pump 104 in the middle of the pipe 103, and the circulation pump 104 circulates the stirring target from the lower part of the dissolution tank 101 to the upper side of the dissolution tank 101. The inside of the dissolution tank 101 is agitated by an agitating blade 106 that rotates around a rotating shaft 105 that is attached to the motor and rotated by power from a motor or the like.

JP 2007-021357 A

  In the circulation structure of Patent Document 1, the powder to be stirred is supplied from the upper part of the dissolution tank 101. When the amount of the liquid as the solvent is not sufficient, the powder is not stirred and the powder is put on the stirring blade 106. Even if the liquid is deposited or the liquid covers the stirring blade 106, the product is deposited on the stirring blade 106 without being stirred, and the product becomes defective without uniform stirring. There is a risk that. Further, since circulation from the lower part to the upper part of the dissolution tank 101 is performed by the circulation pump 104, the circulation pump 104 has to be installed separately, which increases the cost, and only the circulation pump 104 is broken. When the operation stops due to the above, or when the efficiency of the circulation pump 104 is deteriorated, the circulation is stopped or the circulation efficiency is lowered, and the product quality may be deteriorated.

  In view of the above problems, an object of the present invention is to provide a circulation structure of a stirring device that does not require a circulation pump.

  The circulation structure of the present invention includes a pair of agitation blades provided at the bottom of the agitation tank, a circulation pipe that communicates between the bottom of the agitation tank and the side or top of the agitation tank. The one stirring blade of the pair of stirring blades causes the stirring target to flow from the bottom side to the top side of the stirring tank at the bottom of the stirring tank, and the other stirring blade of the pair of stirring blades. The blades flow the stirring target from the bottom of the stirring tank toward the circulation pipe.

  Further, the pair of stirring blades are arranged to face each other, and a powder supply port communicating with the flow path is provided in a flow path between the one stirring blade and the other stirring blade. Is preferred.

  The pair of stirring blades preferably rotate about the same axis.

  In addition, the pair of stirring blades are disposed vertically opposite to the bottom of the stirring tank, and a substantially cylindrical cover that covers the outer periphery of the one stirring blade is provided. A side surface and an upper surface of the cylindrical cover It is preferable that holes for forming a flow path to be agitated are provided on the lower surface.

  According to the present invention, by providing the pair of stirring blades, the stirring target in the stirring tank can be circulated from the bottom to the top of the stirring tank by the stirring blade without providing other circulation means such as a circulation pump. . In addition, since other circulation means such as a circulation pump is not used to circulate the object to be agitated, both circulation and agitation can be performed by a single drive source, so it is necessary to install another structure for circulation. In addition, the cost can be reduced, the number of parts can be reduced, and the unevenness of the product due to the deterioration of the performance of one member due to the failure of one member can be prevented.

  Also, by providing a powder supply port in the flow path between the pair of stirring blades, it is not necessary to supply powder from above the stirring tank, so that the powder accumulates on the stirring blade provided inside the stirring tank. Therefore, uniform stirring can be performed, and the occurrence of defective products can be prevented.

It is the schematic for demonstrating the circulation structure of this invention. It is an enlarged view of the circulation structure of FIG. It is a figure which shows an example of the stirring blade used for the circulation structure of this invention. It is a figure which shows position embodiment of the circulation structure of this invention. It is a figure for demonstrating the conventional circulation structure.

  Hereinafter, the circulation structure of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic view for explaining the circulation structure of the present invention. As shown in FIG. 1, the circulation structure 1 of the present invention includes a pair of stirring blades 3, 4 and a cylindrical casing C that communicates with the bottom of the stirring tank 2 and accommodates a pair of stirring blades 3, 4. The circulation pipe 5 is a circulation passage that communicates between the casing C and the side or upper portion 2U of the stirring tank 2. The stirring device shown in FIG. 1 is provided with a plurality of stirring blades 22 extending from a rotating shaft 21 rotatably supported on an upper portion of a stirring tank 2 of the stirring device. The structure of the stirring blade 22 is not particularly limited, and a known stirring blade can be used. The circulation pipe 5 is not particularly limited as long as it is a pipe that can circulate liquid, and the connection position on the upper side of the circulation pipe 5 is not limited to the illustrated position. The upper part of the stirring tank 2 may be sufficient and a side surface may be sufficient. Further, on the side surface, the side surface may be above the side surface, at the center of the side surface or below the side surface, and as shown in FIG. A plurality of circulation ports may be provided.

  Next, the present invention will be described in detail using an enlarged view of the circulation structure 1 shown in FIG.

  As shown in FIG. 2, the bottom 2 </ b> L of the stirring tank 2 is disposed between the stirring tank 2 and the circulation pipe 5 in order to send the stirring target of the bottom 2 </ b> L of the stirring tank 2 to the circulation pipe 5. A casing C is provided. The upper part of the casing C partially enters the stirring tank 2, and the upper end of the casing C and the side surface of the casing C in the stirring tank 2 have openings. The casing C is provided with a pair of stirring blades 3 and 4 facing each other. One stirring blade 3 provided in the upper part in FIG. 2 is arranged slightly spaced upward from the bottom 2L of the stirring tank 2, and the side opening 10a in the stirring tank 2 of the casing C and the upper end of the casing C are disposed. It arrange | positions so that it may be located between the side openings 10b. The stirring blade 3 stirs the stirring target of the bottom 2L of the stirring tank 2 while flowing from the bottom 2L side to the upper side as indicated by arrows A1 and A2 in FIG.

  The casing C is connected to the circulation pipe 5 from the lower side of the casing C, and further has a powder supply port 9 through which powder is supplied. The other stirring blade 4 is disposed at a position lower than the powder supply port 9 to stir the powder supplied from the powder supply port 9 and to set the stirring target at the bottom 2L of the stirring tank 2 as shown in FIG. Are stirred while flowing from the casing C toward the circulation pipe 5 as indicated by arrows A3 and A4. The opening provided in the casing C is not particularly limited as long as it serves as a passage for the fluid to be agitated, and may be a plurality of openings or a single continuous opening.

  The stirring blades 3 and 4 can be driven by separate drive shafts. However, as shown in FIG. 2, when both the stirring blades 3 and 4 are rotated by the same drive shaft, Both the stirring blades 3 and 4 can be rotated by a driving source, and both the stirring at the bottom of the stirring tank 2 and the circulation to the upper part of the stirring tank 2 can be performed by one driving source, which is preferable. In this case, one stirring blade 3 on the upper side is connected to the other stirring blade 4 on the lower side by a connecting shaft 6, and the other stirring blade 4 on the lower side is connected to a drive source such as a motor M as a rotation shaft. 7 and is rotatably supported by a bearing B or the like.

  The shape of the stirring blades 3 and 4 is not particularly limited as long as the flow can be generated upward and downward by the respective stirring blades 3 and 4. For example, the shape as shown in FIG. The stirring blade 3 can be employed. The stirring blade 3 is provided with a substantially cylindrical base 31 attached to the rotary shaft 7 or the connecting shaft 6, and is provided integrally with the base 31 around the base 31, and the blade of the stirring blade 3 is provided on the outer periphery thereof. A cylindrical second base 32 and a blade 33 provided integrally from the outer periphery of the second base 32 are configured. When the stirring blade 3 is rotated by driving the motor M, the stirring target can be stirred while the stirring target 3 is moved upward by the blade 33 of the stirring blade 3 in FIG. The blade 33 of the stirring blade 3 is configured such that the protruding length of the blade 33 from the outer periphery of the second base portion 32 becomes longer from the upper side to the lower side in FIG. Furthermore, as shown in FIG. 2, it is comprised so that it may become a substantially trapezoid shape. The stirring blade 4 can have the same configuration as that of the stirring blade 3 in FIG. 3. In this case, the stirring blade 4 in FIG. And can flow in both directions. Needless to say, the stirring blades 3 and 4 are not limited to the same shape, and stirring blades 3 and 4 having different shapes can be used. By providing a pair of stirring blades with the direction of the stirring blade 3 on the upper side and the direction of the stirring blade 4 on the lower side reversed, the upper stirring blade 3 moves upward from the bottom of the stirring tank 2 indicated by arrows A1 and A2 in FIG. The lower stirring blade 4 can generate a flow toward the lower side indicated by arrows A3 and A4 in FIG. 2, that is, toward the circulation pipe 5 side. Further, by providing a pair of the stirring blades 3 on the upper side and the stirring blades 4 on the lower side in reverse, the stirring target of the bottom 2L of the stirring tank 2 is circulated to the upper side of the stirring tank 2 without using a circulation pump. Can be made.

  The rotation speed of the stirring blades 3 and 4 is preferably 1500 to 3500 rpm, and particularly preferably 2500 to 3500 rpm. When the rotational speed is 1500 to 3500 rpm, the powder to be stirred, which will be described later, is supplied to the flow path between the pair of stirring blades 3 and 4 before the powder is circulated. Circulation that is sufficiently agitated before being circulated to the upper part of 2 and does not accumulate on the agitating blade 22 provided inside the agitation tank 2, and that requires a fluid to be circulated by the circulation pipe 5 Quantity can be realized.

  As shown in FIG. 2, a powder supply port 9 communicating with the flow path 8 is formed in the flow path 8 in the casing C between the pair of opposed stirring blades 3 and 4. Since the powder can be supplied from the powder supply port 9, it is not necessary to supply the powder from above the stirring tank 2, so that the powder is not deposited on the stirring blade 22 and uniform stirring is performed. And generation of defective products can be prevented.

  The powder supplied from the powder supply port 9 is sucked into the flow path 8 by utilizing the negative pressure in the flow path 8 due to the fluid flow indicated by arrows A1 to A4 in FIG. That is, the fluid in the flow path 8 is moved upward and downward by the stirring blades 3 and 4 rotating at high speed, and the flow path 8 is in a negative pressure state, and the valve connected to the powder supply port 9 by the negative pressure. Is opened, the powder is sucked into the flow path 8 from the powder supply port 9. Therefore, it is possible to supply the powder only by controlling the opening and closing of the valve, and it is not necessary to supply the powder from above the agitation tank 2, so that the accumulation of the powder on the agitation blade 22 can be prevented. it can. In addition, there is an advantage that with one drive source, in addition to the stirring of the bottom 2L of the stirring tank 2 and the circulation to the upper part of the stirring tank 2, the supply of powder can be performed.

  Next, a powder supply method using the circulation structure 1 of the present invention will be described in detail with reference to FIG. As shown in FIG. 4, the supplied powder is accommodated in a powder container 11 indicated by reference numeral 11. In order to supply the powder in the powder container 11 to the powder supply port 9, a vacuum resistant hose extending from the powder supply port 9 is formed between the powder supply port 9 and the powder container 11. A supply pipe 12 is provided. The supply pipe 12 is airtightly fixed to the powder supply port 9 on the powder supply port 9 side, a tapered nozzle is provided on the powder container 11 side, and the powder in the powder container 11 is Suction is generated by the negative pressure in the casing C generated by the stirring blades 3 and 4. For example, a vacuum-resistant hose can be used as the supply pipe 12, but is not particularly limited as long as it can supply powder. Further, the supply pipe 12 is provided with a powder supply valve 13 that is opened when powder is supplied and is closed when powder is not supplied. Since the powder supply valve 13 can also adjust the amount of powder to be supplied by adjusting the opening, it is possible to control the amount of powder more accurately than when the powder is supplied from above. In addition, a coupled meter 15 is provided for confirming whether the flow path 8 in the casing C is at a negative pressure when the powder is supplied. A circulation valve 14 is provided between the casing C and the circulation pipe 5, and can be circulated or stopped by opening and closing the valve. Further, the circulation valve 14 can also adjust the degree of vacuum in the casing C by the valve opening degree. In the casing C, a compound gauge 15 is provided on the supply pipe 12 side, and a pressure gauge 16 is provided on the circulation pipe 5 side. The pressure in the casing C is measured, and a negative pressure is generated in the casing C. I can confirm that.

  The stirring object sent from the bottom of the stirring tank 2 to the circulation pipe 5 by the stirring blade 4 is circulated to the upper part of the stirring tank 2 and is connected to the side surface of the stirring tank 2 from the circulation port 51 of the circulation pipe 5. Return to 2 again. Although only one circulation port 51 is provided in FIG. 1, it is also possible to provide a plurality of circulation ports 51 as shown in FIG. It is also possible to provide a valve 52 at each circulation port 51 to adjust the circulation amount. In addition, the solution in the tank can be sent to the next step by opening the valve 54 of the discharge port 53 while operating the stirring device.

  Further, by providing a cleaning pipe 17 between the circulation pipe 5 and the supply pipe 12 and opening a circulation cleaning valve 18 provided on each pipe side, the powder supply port 9 can be self-cleaned.

  Hereinafter, the stirring method using the circulation structure of the present invention will be described.

  First, as shown in FIG. 1, with the solution in the stirring vessel 2, the stirring device is started and the stirring blades 3 and 4 are rotated. By the rotation of the stirring blades 3 and 4, the solution in the stirring tank 2 is sent into the circulation pipe 5 and circulated to the upper side of the stirring tank 2. Since the stirring blades 3 and 4 are disposed to face each other in the opposite direction in the casing C, the solution in the flow path 8 between the stirring blades 3 and 4 flows toward the upper side of the casing C. Since it flows toward the lower side of the casing C, a negative pressure is generated between the stirring blade 3 and the stirring blade 4, and the powder can be sucked from the powder supply port 9 by the negative pressure. At this time, it is confirmed by the compound gauge 15 and the pressure gauge 16 that the inside of the casing C has a negative pressure, and if necessary, the degree of vacuum is adjusted by adjusting the opening degree of the circulation valve 14. .

  In this state, the powder supply valve 13 is opened, and the powder in the powder container 11 is sucked into the casing C from a tapered nozzle provided at the tip of the supply pipe 12.

  The powder sucked into the casing C from the powder supply port 9 is mixed with the solution in the casing C. The stirring object flowing upward is stirred by the upper stirring blade 3, and the stirring object flowing downward is stirred by the stirring blade 4. The The supplied powder is once stirred by the stirring blade 4 and then stirred by the stirring blade 22 in the stirring tank 2 before being circulated to the upper part of the stirring tank 2, so that the stirring tank 2 remains in powder form. Since the object to be stirred is not supplied inside, there is no possibility of powder adhering to the stirring blade 22. A prescribed amount of powder enters the agitation tank 2 through the casing C, and the agitation device is continuously operated, whereby the solution and the powder are homogeneously agitated, and the generation of defective products can be prevented.

  Next, a method for cleaning the powder supply port 9 using the circulation structure 1 will be described.

  With the stirring device activated, the circulation cleaning valve 18 on the circulation pipe 5 side and the supply pipe 12 side of the washing pipe 17 is opened. By opening the circulation cleaning valve 18, the solution circulating in the upper part of the stirring tank 2 circulates in the cleaning pipe 17. The powder adhering to the powder supply port 9 is self-cleaned by the pressure of the circulating solution by the solution circulating in the cleaning pipe 17. Therefore, by providing the cleaning pipe 17, the powder supply port 9 can be cleaned at the same time that the stirring target is stirred.

  As described above, in the present invention, by providing the pair of stirring blades 3, 4, the stirring object in the stirring tank can be stirred by the stirring blades 3, 4 without providing other circulation means such as a circulation pump. Can be circulated from the bottom of the stirring tank 2 to the top. In addition, since other circulation means such as a circulation pump is not used to circulate the object to be stirred, circulation, stirring and liquid feeding can be performed by one drive source. There is no need to install it separately, which can reduce costs and the number of parts. Furthermore, it is possible to prevent product non-uniformity caused by the deterioration of the performance of one member due to the failure of one member.

  Further, since the powder supply port 9 is provided in the flow path 8 between the pair of stirring blades 3, 4, it is not necessary to supply powder from above the stirring tank 2, so the powder supply port 9 is provided inside the stirring tank 2. The powder is not deposited on the stirring blade 22 and uniform stirring can be performed, and the generation of defective products can be prevented.

DESCRIPTION OF SYMBOLS 1,100 Circulation structure 2 Stirring tank 2L Bottom part 2U Upper part 3, 4 Stirring blade 31 Base part 32 Second base part 33 Blade 5 Circulation piping 51 Circulation port 52, 54 Valve 53 Outlet port 6 Connection shaft 7, 21 Rotating shaft 8 Flow Path 9 Powder supply port 10 Cover 10a Side opening 10b Upper end opening 11 Powder container 12 Supply piping 13 Powder supply valve 14 Circulating valve 15 Compound meter 16 Pressure gauge 17 Cleaning piping 18 Circulating cleaning valve 101 Dissolution tank 102 Liquid outlet 103 Piping 104 Circulating pump 105 Rotating shaft 106 Stirring blade C Casing

Claims (4)

A pair of stirring blades provided at the bottom of the stirring tank;
A circulation structure comprising a circulation pipe communicating between the bottom of the stirring tank and the side or top of the stirring tank;
One stirring blade of the pair of stirring blades causes the stirring target to flow from the bottom side of the stirring tank toward the upper side at the bottom of the stirring tank, and the other stirring blade of the pair of stirring blades, A circulation structure in which a stirring target is caused to flow from the bottom of the stirring tank toward the circulation pipe. The pair of stirring blades are arranged to face each other, and a powder supply port communicating with the flow path is provided in a flow path between the one stirring blade and the other stirring blade. The circulation structure according to claim 1. The circulating structure according to claim 1 or 2, wherein the pair of stirring blades rotate about the same axis. The pair of stirring blades are vertically disposed opposite to the bottom of the stirring tank, and a substantially cylindrical cover that covers the outer periphery of the one stirring blade is provided. The circulation structure according to any one of claims 1 to 3, wherein a hole for forming a flow path to be agitated is provided on the lower surface.

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