JP6263658B1 - Stirrer - Google Patents

Abstract

An object of the present invention is to provide a stirring device capable of evaporating and concentrating while maintaining liquid mixing uniformity in a stirring tank. A stirring device 1 of the present invention includes a stirring tank 2, a rotating shaft 3 suspended in the stirring tank 2, and a stirring blade 12 fixed to the rotating shaft 3. The stirring blade 12 includes: The surface of the stirring blade faces the stirring shaft 3 and is fixed to the stirring shaft 3 at a desired distance. [Selection] Figure 9

Description

  The invention particularly relates to a stirring device for the evaporation and concentration of liquids.

  As a conventional evaporation apparatus, for example, there is an evaporation apparatus a shown in FIG.

  The evaporation apparatus a includes a sealable stirring tank b, a rotating shaft c suspended in the stirring tank b, a half pipe d inclined and fixed to the rotating shaft c, and the stirring tank b. It consists of a heating jacket e for heating and a steam outlet (not shown), and liquid is contained in the stirring tank b until the lower end of the half pipe d is inserted.

  The stirring jacket b is heated by the heating jacket e, and the rotating shaft c is rotated to rotate the half pipe d, so that the liquid in the stirring tank is rotated by the centrifugal force. d rises, scatters outward from the upper end of the half pipe d, adheres to the inner wall of the stirring tank b, and flows downward. As a result, the adhered liquid is heated and evaporated, and the evaporated vapor is discharged from the vapor outlet.

Japanese Patent Laid-Open No. 2006-97348

  However, although the conventional evaporator a has high evaporation performance, the half pipe d is formed in a thin pipe shape for the purpose of sucking up the liquid, and unlike the stirring blade, The liquid could not be flowed, and the mixing performance of the liquid in the agitation tank was not good.

  Therefore, the conventional evaporation apparatus a cannot cope with evaporation when the mixing uniformity is maintained.

  The conventional evaporator a is effective for extracting evaporated vapor, but is not suitable for stirring concentrated liquid (high viscosity fluid).

  That is, as the liquid in the agitation tank b evaporates, the liquid level decreases and the liquid gradually becomes highly viscous, the fluidity deteriorates accordingly, and the agitation mixing property is significantly reduced. In the apparatus a, it was practically impossible to use it for evaporation to be concentrated and stirred.

  In addition, since the conventional evaporator a cannot be used for evaporation that is concentrated and stirred, as shown in FIGS. 18 and 19, it may be possible to use a stirring device g using a large wide blade f. Compared with the conventional evaporator a, the evaporation performance is remarkably lowered, and optimal stirring cannot be achieved.

  The present invention provides a stirring device capable of performing evaporation and concentration while maintaining mixing uniformity of a liquid in a stirring tank.

  In order to achieve the above object, the present invention provides a stirring device comprising a stirring tank, a rotating shaft suspended in the stirring tank, and a stirring blade fixed to the rotating shaft. The surface of the wing is fixed to the stirring shaft at a desired distance while facing the stirring shaft.

  Further, the stirring blade has one portion formed on one side and the other formed on the other side, with an axial center line passing through a line on the stirring blade facing the rotating shaft as a boundary. It is characterized by comprising the part.

  Further, the stirring blade is formed of a trapezoidal plate that becomes narrower from the bottom to the top.

  In addition, one part of the plate-like body is formed at least from the middle part of the plate-like body to the lower part, and the other part is formed at least from the middle part of the plate-like body to the upper part. It is characterized by that. One part of the plate-like body is formed at least in a lower part of the plate-like body, and the other part is formed at least in an upper part of the plate-like body.

Further, the stirring blade is characterized by comprising a strip-shaped plate body that crossover with inclined relative to the rotation axis.

  Further, a folding piece is provided on the outer side located below the stirring blade.

  Further, an auxiliary blade is provided on the blade surface of the stirring blade, and the blade surface of the auxiliary blade is provided so as to cross the blade surface of the stirring blade.

  In addition, a baffle plate is provided in the stirring tank.

  According to the present invention, evaporation and concentration can be performed while maintaining the mixing uniformity of the liquid in the stirring tank.

It is a vertical front view of the stirring apparatus of Example 1 of this invention. It is a vertical side view of the stirring apparatus of Example 1 of this invention. It is the cross-sectional top view which abbreviate | omitted the heat-transfer jacket of the stirring apparatus of Example 1 of this invention. It is a vertical front view of the stirring apparatus of Example 2 of this invention. It is a vertical side view of the stirring apparatus of Example 2 of this invention. It is the cross-sectional top view which abbreviate | omitted the heat-transfer jacket of the stirring apparatus of Example 2 of this invention. It is a vertical front view of the other Example of the stirring apparatus of Example 2 of this invention. It is the cross-sectional top view which abbreviate | omitted the heat-transfer jacket of the other Example of the stirring apparatus of Example 2 of this invention. It is a perspective view of the stirring blade of the stirring apparatus of Example 3 of this invention. It is the cross-sectional top view which abbreviate | omitted the heat-transfer jacket of the stirring apparatus of Example 3 of this invention. It is a vertical front view of the stirring apparatus of Example 3 of this invention. It is a vertical front view of the stirring apparatus of Example 4 of this invention. It is a vertical side view of the stirring apparatus of Example 4 of this invention. It is the cross-sectional top view which abbreviate | omitted the heat-transfer jacket of the stirring apparatus of Example 4 of this invention. It is a vertical front view of the other Example of the stirring apparatus of Example 4 of this invention. It is a vertical front view of other Example of the stirring apparatus of Example 4 of this invention. It is a vertical front view of the conventional evaporator. It is a vertical front view of the conventional stirring apparatus. It is a vertical side view of the conventional stirring apparatus.

  The example of the form for carrying out the present invention is shown below.

  A first embodiment of the present invention will be described with reference to FIGS.

  Reference numeral 1 denotes a stirring device according to the first embodiment, 2 denotes a stirring tank of the stirring device 1, and the stirring tank 2 is formed so as to be hermetically sealed, and is, for example, cylindrical and has an inner bottom surface 2 a recessed downward. It is formed to be curved. A steam outlet (not shown) is provided at the upper part of the stirring tank 2.

  Reference numeral 3 denotes a rotating shaft suspended from the central portion in the stirring tank 2, 4 denotes one or a plurality of stirring blades fixed to the rotating shaft 3, and each stirring blade 4 is, for example, plate-shaped The surface of the stirring blade 4 is opposed to the rotary shaft 3 in parallel, and is fixed to the rotary shaft 3 via a support rod 5 at a desired distance.

  In this embodiment, an example using two stirring blades 4 and 4 is shown.

  Reference numeral 6 denotes a heating means such as a heat transfer jacket provided on the outer peripheral surface of the stirring tank 2 for heating the stirring tank 2, 7 denotes a baffle, and the baffle 7 has a rectangular plate shape extending in the vertical direction. It consists of a baffle plate, and is provided on the inner peripheral surface 2b of the agitation tank 2 so as to extend from the bottom toward the upper end. The baffle 7 may be omitted.

  Further, each of the stirring blades 4 is made of, for example, a single flat plate-like body, and the plate-like body is an axis that passes through the line 8a on the stirring blade 4 and faces the axis 3a of the rotating shaft 3. It is formed by one plate portion 9a formed on one side (left side in FIG. 1) and the other plate portion 9b formed on the other side (right side in FIG. 1) with the core wire 8 as a boundary. The

  For example, as shown in FIG. 1, the agitating blade 4 is composed of a single left and right symmetrical trapezoidal plate-like body composed of a lower part 10 and an upper part 11 connected to the upper part of the lower part 10. The lower portion 10 is formed in a wide rectangular shape in which the outer sides 10a and 10b each extend to the vicinity of the inner peripheral surface of the stirring tank 2 (in the case of a baffle, the inner side of the baffle). The upper portion 11 is formed with inclined outer sides 11a and 11b so that the width gradually decreases from the lower side toward the upper side.

  Further, the lower side 10c of the lower part is formed, for example, in a concave shape so as to be close to the inner bottom surface 2b of the stirring tank 2, and the upper side 11c of the upper part 11 is, for example, a horizontal straight line It is formed in a shape.

  And the said stirring blade 4 is connected and fixed to the said support rod 5 in the desired location of the center part in the left-right direction of the said stirring blade 4, for example.

  Next, the operation and effect of the stirring device 1 of the first embodiment will be described.

  The liquid to be evaporated and concentrated is filled in the stirring tank 2 to a desired liquid level, for example, above the stirring blade 4.

  And while heating the said stirring tank 2 with the said heat-transfer jacket 6, the said rotating shaft 3 is rotated with a rotation drive device (not shown), and the said stirring blade 4 is made to the direction of the arrow (FIG. 3). (Clockwise in 3).

  The liquid stored in the stirring tank 2 is heated and evaporated by the heat transfer jacket 6, and the evaporated vapor is discharged from the vapor outlet, and the liquid is concentrated.

  Further, on the one side (on the left side in FIG. 1) located downstream of the rotation direction with the axial center line 8 of the stirring blade 4 as a boundary, which becomes a forward blade by rotation of the stirring blade 4 The liquid stored in the stirring tank 2 is strongly mixed by the formed one plate portion 9a.

  Then, the liquid gradually evaporates, the liquid level is lowered, and the liquid level is lowered. As a result, the heat transfer area of the stirring tank b that comes into contact with the liquid is reduced, and the heat transfer surface that has become the gas phase portion is effectively utilized. However, the upper part of the agitating blade 4 is exposed from the liquid, and the other side of the exposed agitating blade 4 located on the upstream side with respect to the rotation direction becomes the retreating blade (the right side in FIG. 1). The other plate portion 9b formed on the surface facilitates the outward movement of the liquid sucked up by the centrifugal force, so that the scattered liquid adheres to the inner peripheral surface 2b of the stirring tank 2, The liquid that flows downward along the inner peripheral surface 2b is heated and evaporated, thereby improving the evaporation performance.

  According to the first embodiment of the present invention, the agitating blade 4 is disposed at a desired distance from the rotating shaft 3 so that the advancing blade and the retreating blade are formed on the agitating blade 4, and the advancing blade By virtue of this, the viscous fluid can be vigorously stirred, and even if the liquid level is low and the heat transfer area is reduced, the exposed receding blades can promote liquid jumping and increase the evaporation performance. Therefore, both the stirring performance and the evaporation performance can be achieved.

  A second embodiment of the present invention will be described with reference to FIGS.

  In Embodiment 2 of the present invention, for example, a belt-like stirring blade 12 is used in the stirring device 1 of Embodiment 1 instead of using the trapezoidal stirring blade 4.

  The band-shaped stirring blade 12 is formed, for example, such that the lower portion has a wider blade width, and the upper portion is formed to be narrower than the lower portion.

  The stirring blade 12 is formed of, for example, a single flat plate-like body as in the first embodiment, and the plate-like body is opposed to the axis 3 a of the rotating shaft 3 and is a line 8 a on the stirring blade 4. One plate portion 9a formed on one side (left side in FIG. 4) and the other plate portion 9b formed on the other side (right side in FIG. 4), with an axis 8 passing through Is formed.

  Furthermore, in Example 2 of the present invention, the stirring blade 12 includes a lower part 13, an intermediate part 14 provided continuously with the upper part of the lower part 13, and an upper part 15 provided continuously with the upper part of the intermediate part 14. The one plate portion 9a is formed at least on the lower portion 13 and the intermediate portion 14, and the other plate portion 9b is formed on at least the intermediate portion 14 and the upper portion 15. So that

  And, as shown in FIG. 4, for example, the stirring blade 12 is composed of a long belt-like flat plate composed of a lower portion 13, an intermediate portion 14, and an upper portion 14, and the flat plate is formed of the intermediate portion. 14 is connected and fixed to the support rod 5 at a desired location in the center portion in the left-right direction. For example, the lower portion 14 is positioned only on the one side and the upper portion 15 is connected to the other side. The support rod 5 is connected and fixed so as to be inclined so as to be positioned only on the side.

  The lower portion 13 formed on the one side has one outer side 13a extending to the vicinity of the inner peripheral surface of the stirring tank 2 (the inner side of the baffle when there is a baffle), and The other outer side (inner side) 13b is formed wide so as to extend to the vicinity of the axis 8.

  Further, the intermediate portion 14 and the upper portion 15 are narrower as the blade width decreases from the lower side to the upper side, and one and the other outer sides 14a, 14b, 15a of the intermediate portion 14 and the upper portion 15 are arranged. 15b are formed, and the outer sides of one and the other are inclined from one side to the other side from the lower side to the upper side, and are linearly intersected with the rotating shaft. Is formed.

  In addition, one outer side 14a located above the intermediate part 14 and one outer side 14a located above the upper part 15 are formed on one continuous outer side 12a, for example. .

  Further, the other outer side 13b of the lower part 13, the other outer side 14b positioned below the intermediate part 14, and the other outer side 14b positioned below the upper part 15 are, for example, It is formed on the other continuous outer side 12b.

  Further, the lower side 13c of the lower part 13 is formed, for example, in a concave shape so as to be close to the inner bottom surface 2a of the stirring tank 2, and the upper side 15c of the upper part 15 is, for example, a straight line. It is formed into a shape.

  The lower portion 13 may be formed on the other side in addition to being formed only on the one side.

  Further, the upper portion 15 may be formed on one side in addition to being formed only on the other side.

  Next, the operation and effect of the stirring device 1 of the second embodiment will be described.

  As in the first embodiment, the liquid to be evaporated and concentrated is filled in the stirring tank 2 to a desired liquid level, for example, above the stirring blade 12.

  And while heating the said stirring tank 2 with the said heat-transfer jacket 6, the said rotating shaft 3 is rotated with a rotation drive device (not shown), and the said stirring blade 12 is made into the direction (FIG. 6) of the arrow. (Clockwise in 6).

  The liquid stored in the stirring tank 2 is heated and evaporated by the heat transfer jacket 6, and the evaporated vapor is discharged from the vapor outlet, and the liquid is concentrated.

  In addition, on the one side (left side in FIG. 4) located downstream of the rotation direction with the axial center line 8 of the stirring blade 12 as a boundary, which becomes a forward blade by the rotation of the stirring blade 12 The liquid in the stirring tank 2 is strongly mixed by the formed one plate portion 9a.

  Then, the liquid gradually evaporates, the liquid level is lowered, and the liquid level is lowered, so that the heat transfer area of the stirring tank is reduced, and the heat transfer surface that has become the gas phase portion is not effectively utilized. The other part formed on the other side (the right side in FIG. 4) that is located on the upstream side with respect to the rotation direction, the upper part of the blade 12 is exposed from the liquid and becomes the retreating blade of the exposed stirring blade 12 The plate portion 9b promotes the outward movement of the liquid sucked up by the centrifugal force, so that the scattered liquid adheres to the inner peripheral surface 2b of the agitation tank 2 and is applied to the inner peripheral surface 2b. And the attached liquid is heated and evaporates, thereby improving the evaporation performance.

  Furthermore, if the liquid level is lowered to the lower part 13 of the stirring blade 12, the entire surface becomes a reverse blade, and operation with extremely low power is possible compared with the conventional blade, and the rotational speed for the same energy consumption is increased. Increase the speed near the wall to make the film thinner and improve heat transfer performance.

  According to the second embodiment of the present invention, the stirring blade 12 is formed such that the lower part of the stirring blade 12 is the forward blade and the upper part is the backward blade. Even when the liquid level is low and the heat transfer area is reduced, the exposed advancing blade can promote the liquid jumping and increase the evaporation performance. It becomes possible to achieve both performance.

  In the case where the evaporating action is not so necessary and the purpose is to improve the mixing performance of the highly viscous fluid, as shown in FIGS. 7 and 8, the stirring blade 12 is moved in the direction of the arrow in FIG. In the counterclockwise direction).

  In forward rotation, a very turbulent liquid scattering effect is seen, but in reverse transfer, strong suction from the center of the tank is generated, and emphasis is placed on mixing performance under full to high viscosity stirring conditions. The effect suitable for the condition comes to be demonstrated.

  Moreover, the lower part 13 which is the main surface of the stirring blade 12 becomes a retreating blade, and operation with lower power is possible.

  Therefore, in the stirring apparatus according to the second embodiment of the present invention, various stirring purposes can be handled by changing the rotation direction.

  A third embodiment of the present invention will be described with reference to FIGS.

  In Example 3 of the present invention, the other outer side 13b of the lower part 13 of the stirring blade 12 of Example 2 and the other outer side 12b located on the lower side of the intermediate part 14 and the upper part 15 are desired. A rectangular bent piece 16 is formed that extends in the length, for example, 90 degrees and is bent outward (on the opposite side to the rotating shaft).

  With the folded piece 16, as shown in FIG. 11, the liquid contained in the stirring tank 2 is raised to the upper end of the folded piece 16 in the direction of the arrow in FIG. Evaporation performance can be improved by allowing the liquid to adhere to the upper part of the inner peripheral surface 2b of the stirring tank 2 and allowing the scattered liquid to contact the inner peripheral surface 2b of the stirring tank 2 for a long time. .

  Therefore, for example, the action of splashing the low-viscosity fluid stored in the stirring tank to about 50% of the liquid level is added, and the evaporation performance can be further improved.

  Note that the length, width, and installation position of the folded piece 16 can be arbitrarily adjusted according to the liquid level to be jumped.

  A fourth embodiment of the present invention will be described with reference to FIGS.

  In the fourth embodiment of the present invention, the inner surface (rotation) of the lower portion 13 and / or the intermediate portion 14 of the stirring blade 12 of the stirring blades 4 and 12 of the first to third embodiments of the present invention. One or a plurality of elongated rectangular auxiliary wings 17 are fixed to the shaft side surface).

  Further, the blade surface of the auxiliary blade 17 is provided so as to cross the blade surface of the stirring blade 12, for example, orthogonally.

  Further, the auxiliary wings 17 are inclined and fixed so as to extend outward from the center side as they go from below to above.

  The auxiliary blade 17 may be provided so as to project outward from the other outer side of the stirring blade 12.

  The auxiliary blade 17 rotates the liquid in the stirring tank 2 to forcibly swell the highly viscous fluid toward the wall side, and the raised liquid is heated in contact with the inner peripheral surface 2 b of the stirring tank 2. The heat transfer surface that has become the gas phase can be used effectively, and the evaporation performance is improved.

  In addition, it is possible to achieve both improvement in mixing uniformity.

  The auxiliary wings 17 are adjusted in mounting angle, length and number according to the properties of the liquid.

  In addition, when used as reverse rotation, the stirring blade 12 is fixed to the outer surface (surface facing away from the rotation axis).

  In the agitation apparatus of Examples 1 to 4, in the concentration and agitation where the liquid level fluctuates (decreases) as shown by the arrows in FIGS. It is preferable to use a baffle adapted to the condition where the viscosity gradually increases from low viscosity to become a highly viscous fluid. For example, the length, position, shape and number of baffles are changed.

  For example, the baffle 7a shown in FIG. 15 shows an example of a belt-like baffle extending from the upper end of the stirring vessel 2 to the lower end of the upper portion 15 of the stirring blade 12.

  Moreover, the baffle 7b shown in FIG. 16 shows an example of a belt-like baffle that extends from the upper end of the stirring vessel 2 to the vicinity of the upper end of the lower portion 13 of the stirring blade 12 and gradually becomes narrower below.

  As described above, the baffle design enables free handling according to the purpose of stirring.

  In addition, the stirring blades 4 and 12 in the first to fourth embodiments may be formed from a plurality of plates in addition to being formed from a single plate, for example, a lower portion and an upper portion. May be formed separately. Further, the intermediate portion is omitted, and for example, the lower portion and the upper portion are each supported by the support 5.

DESCRIPTION OF SYMBOLS 1 Stirring apparatus 2 Stirring tank 2a Inner bottom face 2b Inner peripheral surface 3 Rotating shaft 3a Axis 4 Stirring blade 5 Supporting rod 6 Heat transfer jacket 7 Baffle 7a Baffle 7b Baffle 8 Axis 8a Wire 9a One plate portion 9b The other plate portion DESCRIPTION OF SYMBOLS 10 Lower part 10a Outer side 10b Outer side 10c Lower side 11 Upper part 11a Outer side 11b Outer side 11c Outer side 12c Outer side 12b Outer side 13 Lower part 13a Outer side 13b Outer side 13c Lower side 14 Intermediate part 14a Outer side 14b Outer side Side 15 Upper part 15a Outer side 15b Outer side 15c Upper side 16 Broken piece 17 Auxiliary wing

Claims (5)

A stirring tank, a rotating shaft suspended in the stirring tank, and a stirring blade fixed to the rotating shaft,
The stirring blade is fixed to the stirring shaft with a surface of the stirring blade facing the stirring shaft and spaced apart by a desired distance .
The stirring blade has one part formed on one side and the other part formed on the other side, with an axial center line passing through a line on the stirring blade facing the rotating shaft. And more
The stirring blade is made of a flat plate-like body, and one part of the plate-like body is formed at least from the middle part of the plate-like body to the lower part,
The other portion is formed at least from an intermediate portion to an upper portion of the plate-like body . The stirring blade, stirring device according to claim 1, characterized in that a strip-shaped plate member that intersect with inclined against the rotary shaft. The stirring device according to claim 2 , wherein a bent piece is provided on an outer side located below the stirring blade . The auxiliary blade is provided on the blade surface of the stirring blade, and the blade surface of the auxiliary blade is provided so as to intersect the blade surface of the stirring blade. stirring device according to. The stirring device according to any one of claims 1 to 4, wherein a baffle plate is provided in the stirring tank .

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