JP3168410U - Circulating mixer - Google Patents

Abstract

An object of the present invention is to provide a circulating mixer capable of promoting the emulsification of an object to be stirred and obtaining a uniform and stable emulsion by improving the stirring ability of the object to be stirred. A cylindrical container 1 into which a liquid stirring object is charged, a pump for feeding again the stirring object discharged from the lower end side of the cylindrical container 1 to the inside of the cylindrical container 1, And a discharge mixer 4 that discharges the agitated object to be stirred. In a circulation mixer that performs the agitation operation while circulating the agitated object that is put into the cylindrical container 1, the pump is a centrifugal pump 3, and the pump The centrifugal pump 3 is a cavitation generation pump that generates cavitation exceeding the standard value of the amount of cavitation that is normally determined, and a mechanism that promotes emulsification of the object to be stirred by the cavitation. [Selection] Figure 2

Description

  The present invention relates to a circulating mixer suitable for agitation of various juices and milk beverages, in particular, beverages and seasonings containing moisture, acid, and fat components.

  Conventionally, as described above, a cylindrical container into which a liquid stirring object is charged, a pump for feeding again the stirring object discharged from the lower end side of the cylindrical container to the inside of the cylindrical container, and stirring A circulation mixer shown in Patent Document 1 that includes a take-out portion that discharges a stirring object and performs a stirring operation while circulating the stirring object that has been put into a cylindrical container is conventionally known.

JP-A-9-327618

  The circulation mixer of the above document can mix and stir a stirring object composed of a plurality of liquids at high speed and is highly durable as compared with the case of directly stirring the stirring object with a propeller or the like. On the other hand, when an object to be stirred containing an acid and an oil component is stirred and emulsified, sufficient atomization cannot be obtained, and the emulsification of the object to be stirred may not be sufficiently promoted. is there.

  It is an object of the present invention to provide a circulating mixer that can promote the emulsification of a stirring object by improving the stirring ability of the stirring object as described above, and obtain a uniform and stable emulsion. It is said.

  In order to solve the above-mentioned problems, the present invention firstly, a cylindrical container 1 into which a liquid stirring object is charged, and the stirring object that has flowed out from the lower end side of the cylindrical container 1 are again in the cylindrical container 1. A circulating mixer that includes a pump that feeds to the inside of the container and a take-out unit 4 that discharges the stirred object to be stirred, and performs a stirring operation while circulating the stirred object that has been charged into the cylindrical container 1. The pump is a centrifugal pump 3, and the centrifugal pump 3 is a cavitation generating pump that generates cavitation exceeding the standard value of the amount of cavitation that is normally determined, and a mechanism that promotes emulsification of the object to be stirred by the cavitation. It is characterized by.

  Secondly, the centrifugal pump 3 has a rotor chamber 29 in which a rotor 22 that is rotationally driven is housed, and a suction opening that opens to the side of the rotor chamber 29 and sucks a stirring object from the cylindrical container 1. The case 21 includes a port 18 and a discharge port 19 that delivers a stirring object to the cylindrical container 1 side, and is provided with a pressurizing chamber 28 that pressurizes fluid from the suction port 18 to the discharge port 19. The pressurizing chamber 28 is characterized in that an inclined surface 36 inclined inward in the direction of narrowing the inside of the pressurizing chamber 28 from the suction port 18 toward the discharge port 19 on the vane side surface of the rotor 22 is formed. Yes.

  Third, the inclined surface 36 in the centrifugal pump 3 is provided with a step-shaped diverting surface 40 that guides the flow of the stirring object in a direction to narrow the inside of the pressurizing chamber 28 toward the discharge port 19 side. It is characterized by that.

  Fourthly, the stirring object including the granular material charged into the cylindrical container 1 is pulverized while stirring in the centrifugal pump 3.

  Fifth, an inlet 11 into which the stirring object flows from the cylindrical container 1 side below the cylindrical container 1, and a pump for flowing the stirring object flowing from the cylindrical container 1 side to the centrifugal pump 3 side A three-way valve 2 having a port 12 and a discharge port 13 for flowing a stirring object stirred from the cylindrical container 1 side to the take-out portion 4 side is provided.

  Sixth, the feed pipe 37 that feeds the stirring object from the centrifugal pump 3 side to the cylindrical container 1 side is opened along the tangential direction of the inner peripheral surface of the cylindrical container 1, thereby The vortex flow is generated in the cylindrical container 1.

  Seventh, the lower end portion of the cylindrical container 1 is formed in a funnel shape.

  Eighthly, the cylindrical container 1 includes an auxiliary stirring unit 38 that stirs a solid stirring object in the cylindrical container 1.

  Ninth, the auxiliary stirring unit 38 includes a motor 41 provided on the upper end side of the cylindrical container 1, a rotating shaft 42 that supports the auxiliary stirring unit 38 on the lower end side in the cylindrical container 1, and the rotation. It is characterized by comprising a blade 43 for stirring the object to be stirred on the lower end side of the shaft 42.

  According to the present invention configured as described above, the stirring target object conveyed from the cylindrical container is repeatedly fed to the centrifugal pump, whereby the stirring target object is generated by cavitation generated above the standard value in the centrifugal pump. The impact force exerted on the agitator stirs the object to be stirred to promote emulsification / dispersion, so that a uniform and more stable emulsion (emulsion) can be obtained.

  The centrifugal pump includes: a rotor chamber in which a rotor that is rotationally driven is housed; a suction port that opens to a side surface of the rotor chamber and sucks a stirring object from the cylindrical container; and a cylindrical container side And a pressurizing chamber that pressurizes fluid from the suction port to the discharge port, and the pressurizing chamber is sucked on the vane side surface of the rotor. By forming an inclined surface that is inclined inwardly in the direction of narrowing the inside of the pressurized chamber from the mouth to the discharge port, the stirring object can be pumped again into the cylindrical container. An amount of cavitation sufficient to promote emulsification of the stirring object can be generated.

  In addition, if the stepped turning surface for guiding the flow of the stirring object in the direction of narrowing the pressure chamber toward the discharge port side is provided on the inclined surface in the centrifugal pump, the stirring object is provided from the discharge port. It is possible to prevent a rapid pressure drop when the water is discharged.

  Furthermore, if the stirring target object containing the granular material put into the cylindrical container can be pulverized while stirring in the centrifugal pump, the stirring target object including many solids can be stirred and pulverized. There is an effect.

  An inlet into which the stirring object flows from the cylindrical container side, a pump port for flowing the stirring object flowing in from the cylindrical container side to the centrifugal pump side, and stirring from the cylindrical container side below the cylindrical container By providing a three-way valve having a discharge port for flowing the agitated object to the take-out part side, the agitation work performed by circulating the agitated object in the cylindrical container, and a sufficiently agitated agitated object It is possible to easily switch between the discharging operation of taking out from the container.

  Further, the feeding pipe for feeding the stirring object from the centrifugal pump side to the cylindrical container side is cylindrical by feeding the stirring object along the tangential direction of the inner peripheral surface of the cylindrical container. In addition to generating vortex flow in the container and stirring not only in the centrifugal pump but also in the cylindrical container, the object to be stirred contains a sufficient amount of air, which has the effect of stirring by cavitation in the centrifugal pump. There is an effect that the emulsification can be promoted more.

  In addition, since the lower end part of the said cylindrical container was formed in the funnel shape, the more stable overflow can be generated in a cylindrical container and sufficient air can be included.

  Furthermore, even if a solid stirring object is crushed in the cylindrical container to make it into a semi-solid state in the cylindrical container, it may not normally be pulverized in a centrifugal pump. In addition, since the auxiliary stirring unit can be crushed to a state where it can be stirred in the centrifugal pump, the versatility is improved, and even a solid stirring object can be stirred without pretreatment. This improves convenience.

It is a front view which shows the circulation type mixer to which this invention is applied. It is a principal part front view which shows the circulation type mixer to which this invention is applied. It is a principal part side view which shows the circulation type mixer to which this invention is applied. It is a principal part top view which shows the circulation type mixer to which this invention is applied. (A) And (B) is the front view which showed the outline | summary of the centrifugal pump, and the left view. It is an expanded sectional view which expands and shows composition in a centrifugal pump. (A) And (B) is the table | surface and its graph which each compared the viscosity of the stirring thing obtained by the present Example and the comparative example for every rotation speed of the rotor. It is a comparison figure of a present Example and a comparative example in the time of 5 minutes progress after stirring. It is a comparison figure at the time of tilting 30 degree | times each of a present Example and a comparative example at the time of 1 hour progress after stirring. It is a comparison figure of a present Example and a comparative example at the time of 24 hours progress after stirring. (A) And (B) is a principal part top view and principal part front view which show the state which installed the auxiliary mixer.

1 to 4 are a front view, a main part front view, a main part side view, and a main part plan view showing a circulating mixer to which the present invention is applied.
As shown in the figure, the circulation mixer includes a cylindrical container 1 into which a stirring object is charged, a three-way valve 2 that is disposed below the cylindrical container 1 and switches a direction in which the stirring object flows; A pressurizing centrifugal pump 3 (hereinafter referred to as a centrifugal pump) for circulating the stirring object, a take-out unit 4 for discharging the stirring object put into the cylindrical container 1 to the outside, driving of the centrifugal pump 3 and three-way And a control unit for adjusting the valve 2, and these are housed in a box-shaped housing case 6.

  The cylindrical container 1 is formed in a cylindrical shape whose upper end side is opened, and a lower end side is formed in a funnel shape, and the stirring target charged from the opened upper end side is cylindrical during stirring work. It is comprised so that it may flow out with the air to the said three-way valve 2 side, generating an overflow from the lower end side of a container. Moreover, the upper end side of the cylindrical container 1 is covered by mounting the cover part 8 to which the U-shaped handle 7 was attached at the time of stirring operation.

  The three-way valve 2 includes an inlet 11 into which a stirring object charged into the cylindrical container 1 disposed on the upper side flows, and a stirring object that has flowed in from the inlet 11 to the centrifugal pump 3 side. A pump port 12 for flowing, and a discharge port 13 for flowing the stirring object flowing in from the inlet 11 to the take-out portion 4 side, and the direction of flowing the stirring object flowing from the cylindrical container 1 is set to the centrifugal pump 3 side or It can be changed to the extraction unit 4 side. In addition, by closing the inflow port 11 or simultaneously closing the pump port 12 and the discharge port 13 so that they do not flow to either the centrifugal pump 3 side or the extraction unit 4 side, the stirring target is placed in a cylindrical container. It is comprised so that it can be stored in 1.

  At this time, the direction in which the stirring object flows by the three-way valve 2 may be configured to manually switch the three-way valve 2 or to be switched by the control unit.

  The extraction unit 4 includes an extraction pipe 16 that discharges the stirring target that has flowed out of the discharge port 13 to the outside, and a switching lever 17 that is manually rotated to discharge the stirring target to the outside. It has. Further, the opening / closing of the discharge port 13 of the three-way valve 2 may be operated by rotating the switching lever 17.

  The centrifugal pump 3 includes a suction port 18 for sucking the stirring target object supplied from the pump port 12 of the three-way valve 2 through the supply pipe 10 from the side of the pump, and a stirring target pressurized by the centrifugal pump 3. A discharge port 19 for feeding an object again from the outer peripheral side of the pump to the cylindrical container 1 side, and the stirring object sucked from the suction port 18 is pressurized inside the centrifugal pump 3 and generated more than the standard. Crushing and stirring are performed by applying an impact force to the stirring target object by the cavitation that has been performed, and the mixture is pumped from the discharge port 19 toward the cylindrical container 1 side.

Next, based on FIG.5 and FIG.6, the internal structure of the said centrifugal pump is demonstrated.
5A and 5B are a front view and a left side view showing an outline of the centrifugal pump, and FIG. 6 is a developed cross-sectional view showing a configuration inside the centrifugal pump.

  From the figure, the centrifugal pump 3 includes a pump case (case) 21 provided with the suction port 18 and the discharge port 19, and a plurality of vanes 22 b radially formed on a boss portion 22 a that is rotationally driven inside the pump case 21. The rotor 22 is rotated by the drive of an electric motor 23 (see FIGS. 1 to 4) provided in the centrifugal pump 3 and the agitated object, air, and the like are pumped from the suction port 18 side. The air is sucked into the pump chamber 24 in the chamber 21, and the agitated object is agitated and pressurized in the pump chamber 24 and fed from the discharge port 19 side.

  The pump case 21 is configured by screwing or the like in a state where the pressurizing case 26 provided with the suction port 18 and the rotor case 27 provided with the discharge port 19 are in contact with each other, The pump chamber 24 in the pump case 21 has a pressurizing chamber 28 formed on the side of the side surface of the vane 22b on the pressurizing case 26 side, and the rotor 22 formed on the rotor case 27 side. It is comprised by the rotor chamber 29 arrange | positioned so that rotation drive is possible (refer FIG. 5 (A) and (B)).

  In the rotor case 27, a drive shaft 31 that rotates the rotor 22 is inserted into the disk-shaped rotor side wall side 30, and the drive force from the electric motor 23 provided along with the centrifugal pump 3 is transmitted to the drive shaft 31. (See FIG. 5B). The plurality of vanes 22b attached to the rotor 22 arranged in the rotor chamber 29 are arranged radially around the drive shaft 31, and spaces (hereinafter referred to as vane chambers 34) are formed between the vanes. Yes.

  The pressure case 26 is provided with a disk-shaped pressure side wall 35 with the suction port 18 opened. The pressurizing chamber 28 is formed with a pressurizing surface (inclined surface) 36 that is smoothly inclined from the suction port 18 side toward the discharge port 19 side. The middle part is the starting end, and the pressurizing chamber 28 is configured to narrow toward the rotor chamber side 29 toward the lower side (from the suction port 18 side to the discharge port 19 side). The pressure is increased and the stirring object is discharged from the discharge port 19 (see FIG. 6).

  With this configuration, the rotor 22 in the rotor chamber 29 is rotationally driven in the direction shown in the drawing (see FIGS. 5A and 6), so that the stirring object and air are sucked from the suction port 18. In a state where the stirring object is stuck in the vane chamber 34, it can be pushed and urged toward the discharge port 19 while applying a centrifugal force. Further, the stirring object stuck into the vane chamber 34 is gradually pressurized toward the discharge port 19 through the pressurizing chamber 28.

  As a result, pressure is sequentially applied along the pressure surface 36 while being agitated by the rotor 22 in the pressure chamber 28 and discharged to the discharge port 19, thereby generating a large number of fine bubbles in the pump chamber 24. Cavitation occurs. At this time, the generation of cavitation in the pump chamber 24 can be promoted by sucking air together with the stirring object from the cylindrical container 1 side and pressurizing and stirring the air in the pressurizing chamber 28.

  Further, a turning surface 40 that rapidly guides (turns) the flow of the pressurized fluid toward the inside of the vane chamber 34 of the rotor 22 is provided in the middle of the pressurizing surface 36 and in the vicinity of the end portion. It is formed in a part shape. The diverting surface 40 pressurizes and delivers a fluid at a portion where the discharge port 19 is located in the pump chamber 24 and promotes the occurrence of cavitation at the discharge port 19.

  In the pump chamber 24 of the centrifugal pump 3 configured as described above, cavitation exceeding the standard value occurs. Here, when the centrifugal pump 3 is driven, the amount of noise in the vicinity of the centrifugal pump 3 increases in proportion to the amount of cavitation generated inside, so that the noise generated when the centrifugal pump 3 having the structure is driven is increased. The level was measured using a digital sound level meter (Electronic Side Instrument Co., Ltd., trade name: TYPE1052).

  When the noise level at the time of driving the centrifugal pump 3 having the above configuration was measured by the digital sound level meter, 87.4 dB was measured. Since the standard noise level of a normal pump is normally configured to be 70 dB or less, the centrifugal pump 3 used in this embodiment may have cavitation exceeding the standard value inside. It could be confirmed.

  Note that the centrifugal pump 3 (electric motor 23) is turned on and off through a control unit by a switch or the like disposed on the front side which is the front side of the housing case 6. Here, although the opening / closing operation of the three-way valve 2 is performed manually, the opening / closing operation of the three-way valve 2 may be interlocked with ON / OFF of the centrifugal pump 3.

  Further, the agitated object sucked from the suction port 18 side and discharged from the discharge port 19 by the centrifugal pump 3 is fed to the centrifugal pump 3 between the discharge port 19 side and the cylindrical container 1 side. It is fed into the cylindrical container 1 through the supply pipe 37. The cylindrical container 1 side end portion of the supply pipe 37 is configured so that a stirring target to be pumped is fed along the inner peripheral surface of the cylindrical container 1. The returned stirring object forms an excessive flow in the cylindrical container 1 along the supplied flow, and takes in a large amount of air into the object.

  At this time, since the lower side of the cylindrical container 1 is formed in a funnel shape, the vortex flow in the cylindrical container 1 is generated when the stirring object flows out from the lower end side of the cylindrical container 1 which is the center of the vortex. The flow becomes more stable, and the stirring object is mixed and stirred together with air in the cylindrical container 1.

  The object to be agitated introduced into the cylindrical container 1 by the circulation type mixer having the above-described configuration closes the discharge port 13 of the three-way valve 2 and opens the inflow port 11 and the pump port 12 in the state where the centrifugal pump 3 is opened. By driving, the stirring object in the cylindrical container 1 is sucked into the centrifugal pump 3 and pressurized inside, and the stirring object is mixed and stirred by cavitation generated inside the centrifugal pump 3. Furthermore, the stirring object pressurized by the centrifugal pump 3 and pumped from the discharge port 19 is returned through the feed pipe 37 so as to promote the generation of vortex in the cylindrical container 1. Further, the agitation work is repeated while the agitation object is circulated.

  Further, the stirring object charged into the cylindrical container 1 and sufficiently stirred by the above-described process is stirred by closing the pump port 12 of the three-way valve 2 and opening the inlet port 11 and the outlet port 13. The stirring target after work is taken out from the take-out pipe 16. At this time, the operator pushes the switching lever 17 in a state where a collection container or the like (not shown) is placed directly under the extraction pipe 16 in the housing case 6 by the work space S provided on the lower side of the extraction pipe 16. Rotate to remove the object to be stirred.

  The controller may be set so that the ON operation of the centrifugal pump 3 and the opening operation of the pump port 12 are interlocked, and the OFF operation of the centrifugal pump 3 and the closing operation of the pump port 12 are interlocked.

  Next, based on FIG. 7 thru | or 10, the comparative experiment of the stirring thing stirred by this invention and the stirring thing stirred by the below-mentioned comparative example is demonstrated. In this comparative experiment, milk, beverage yogurt, and pre-treated blueberry were used as stirring objects, and the ingredients were stirred at a ratio of 2 to 2 to 1 to prepare a blueberry yogurt drink (hereinafter referred to as stirring material). ) Was generated. Moreover, the obtained stirring thing measured the temperature while measuring the viscosity (mPas * s) using the viscometer (Toki Sangyo Co., Ltd., brand name: TV-10M type viscometer).

  As a comparative example, using a commercially available juice mixer (Matsubara Co., Ltd., trade name: MJ-771), the same materials were stirred at the same ratio to produce an agitation, and the viscosity was measured using the same viscometer. In addition to the measurement, the temperature was also measured for comparison.

  FIGS. 7A and 7B are a table and a graph comparing the viscosities of the stirrers obtained in this example and the comparative example for each rotation speed of the rotor. In this example, the rotation speed (rpm) of the same rotor and the time during which the agitation operation is performed substantially in the centrifugal pump 3 and the juice mixer are substantially equal between the present example and the comparative example. Each agitation operation was performed, and the viscosity and temperature of each agitated material were measured by the above method, and the measurement was performed a plurality of times by changing the rotation speed of the rotor.

  At this time, since the operation time in the present embodiment includes the time for the stirring target charged in the cylindrical container 1 to circulate in the circulation mixer, the operation time itself is longer than the juice mixer of the comparative example. However, the substantial grinding time was set to be substantially the same. That is, in this embodiment, the operation time is determined based on the discharge amount of the centrifugal pump 3 and the circulation cycle. In this comparison, the operation time is about 8 minutes in this embodiment and about 10 seconds in the comparison example. It has become. The rotor diameters used in this example and the comparative example are 70 mm and 55 mm, respectively.

  As a result, as shown in FIG. 7, the viscosity of the agitated material according to this example is approximately half that of the comparative example. That is, in this example, it is possible to generate a fluid agitated material with less viscosity than the agitated material using the juicer mixer of the comparative example. In addition, the temperature of the stirring thing obtained by the present Example became about 7 degreeC, and the temperature of the stirring thing obtained by the comparative example became about 8 degreeC.

  FIG. 8 is a comparison diagram of the present example and the comparative example when 5 minutes have elapsed after stirring, and FIG. 9 is an example in which the present example and the comparative example are each inclined by 30 degrees when 1 hour has elapsed after stirring. FIG. 10 is a comparison diagram between this example and the comparative example when 24 hours have elapsed after stirring.

  From the figure, the agitated material obtained by the juicer of the comparative example is not only crushed, but also the emulsification is not sufficiently promoted. On the other hand, the agitated product obtained in this example is gelled, and the impact force of cavitation is added in the centrifugal pump 3, so that the blueberries are sufficiently crushed and become smaller particles, Since the emulsification is promoted by the sufficient atomization action, a liquid stirring material uniformly and stably emulsified is generated (see FIG. 8).

  In addition, when the stirring material after 1 hour is tilted by 30 degrees, the stirring material in the comparative example has a higher viscosity than that immediately after stirring, and the fluidity is lost to such an extent that it hardly flows even when tilted. The agitated material in this example is maintained in an emulsified state even after 1 hour has passed (see FIG. 9).

  By applying the centrifugal pump 3 that generates cavitation described in the present embodiment to a standard value or higher even when a semi-solid object is included in the stirring object, The semi-solid stirring object can be pulverized into pieces by the centrifugal pump 3, and a uniform and stable emulsion can be obtained. That is, in particular, by stirring fruits, vegetables, yogurt and the like with a circulating mixer to which the present invention is applied, an emulsified liquid drink having high fluidity and easy to drink can be obtained. Can be kept for several hours.

  The circulation mixer of the present invention is not limited to juices and drinks, and can be applied to mixing seasonings such as beverages and dressings in which materials containing acids and oily components are mixed.

Next, based on FIG. 11, a different point from the above example will be described in another embodiment 2 of the present invention.
FIGS. 11A and 11B are a main part plan view and a main part front view showing a state where the auxiliary mixer is installed. As shown in the figure, an auxiliary mixer (auxiliary agitation unit) 38 that can crush a solid agitated object so as to be easily agitated is installed on the upper end side of the cylindrical container in place of the lid portion 7.

  The auxiliary mixer 38 has a longitudinal plate-like support member 39 which is bent at both ends and attached to the upper end side of the cylindrical container 1, an auxiliary motor 41 provided on the upper surface side of the support member 39, and the auxiliary motor A rotating shaft 42 that is rotationally driven by 41 and a blade 43 that is attached to the lower end side of the rotating shaft 42 and directly pulverizes a solid stirring object.

  The auxiliary mixer 38 is attached to the cylindrical container 1 side in a detachable manner by placing and engaging the support member 39 on the opened upper end side of the cylindrical container 1. The auxiliary mixer 38 thus installed is arranged so that the rotating shaft 42 passes through the approximate center in the cylindrical container 1, and the lower end side of the rotating shaft 42 extends to the vicinity of the lower end side of the funnel-shaped cylindrical container 1. Established. At this time, the blades 43 attached to the lower end side of the rotating shaft 42 have a first blade 43 a that rotates in the vicinity of the lower end portion of the surface inclined downward of the cylindrical container 1, and the lower end of the cylindrical container 1. And a second blade 43b that rotates in a cylinder connected to the inflow port 11. Note that the cylinder on the lower end side of the cylindrical container 1 and the inlet 11 are formed large enough to pulverize solids such as fruits and vegetables as compared with the above-described embodiment.

  With this configuration, even when there is a solid stirring object that cannot be flowed into the centrifugal pump 3 unless pretreatment is performed, the stirring object is moved to the three-way valve 2 side on the lower end side of the cylindrical container 1. Before flowing, it can be crushed by the blades 43 that are rotationally driven as described above to improve the fluidity in advance and form a gel. Thereby, even if there is a solid stirring object, since the stirring operation can be performed without performing a pretreatment step of pulverizing in advance, versatility and convenience are improved.

DESCRIPTION OF SYMBOLS 1 Cylindrical container 2 Three-way valve 3 Centrifugal pump 4 Extraction part 18 Suction port 19 Discharge port 21 Pump case (case)
22 Rotor 28 Pressurizing chamber 29 Rotor chamber 36 Pressurizing surface (inclined surface)
37 Feeding pipe 38 Auxiliary mixer (auxiliary stirring section)
40 Turning surface 41 Auxiliary motor (motor)
42 Rotating shaft 43 Blade

Claims (9)

  A cylindrical container (1) into which a liquid stirring object is charged, and a pump for feeding again the stirring object discharged from the lower end side of the cylindrical container (1) to the inside of the cylindrical container (1) And a take-out part (4) for discharging the agitated object to be stirred, and in a circulating mixer that performs the agitation work while circulating the agitated object put into the cylindrical container (1), the pump is a centrifugal pump (3) and the centrifugal pump (3) is a cavitation generating pump that generates cavitation exceeding the standard value of the amount of cavitation that is normally determined, and a circulation mechanism that promotes emulsification of the object to be stirred by the cavitation. Type mixer.   The centrifugal pump (3) has a rotor chamber (29) in which a rotor (22) that is rotationally driven is housed, and opens on the side of the rotor chamber (29), and is stirred from the cylindrical container (1). A suction port (18) for sucking the object and a discharge port (19) for sending the stirring object to the cylindrical container (1) side are provided, and fluid is applied from the suction port (18) to the discharge port (19). And a pressurizing chamber (28) for performing pressure, and the pressurizing chamber (28) is arranged from the suction port (18) to the discharge port (19) on the vane side surface of the rotor (22). The circulating mixer according to claim 1, wherein an inclined surface (36) inclined inward in a direction of narrowing the inside of the pressurizing chamber (28) toward is formed.   The inclined surface (36) in the centrifugal pump (3) has a step-shaped turning surface that guides the flow of the stirring object in a direction to narrow the inside of the pressurizing chamber (28) toward the discharge port (19). The circulating mixer according to claim 2, wherein (40) is provided.   The circulating mixer according to any one of claims 1 to 3, wherein the stirring object including the granular material charged into the cylindrical container (1) is pulverized while stirring in the centrifugal pump (3).   The inlet (11) into which the stirring object flows from the cylindrical container (1) side and the stirring object that flows in from the cylindrical container (1) side below the cylindrical container (1) are centrifugal pumps ( 3) A three-way valve (2) having a pump port (12) that flows to the side and a discharge port (13) that flows the stirring object stirred from the cylindrical container (1) side to the take-out part (4) side is provided. The circulating mixer according to any one of claims 1 to 4.   The feed pipe (37) for feeding the stirring object from the centrifugal pump (3) side to the cylindrical container (1) side is opened along the tangential direction of the inner peripheral surface of the cylindrical container (1). The circulating mixer according to any one of claims 1 to 5, wherein a vortex is generated in the cylindrical container (1).   The circulating mixer according to any one of claims 1 to 6, wherein a lower end portion of the cylindrical container (1) is formed in a funnel shape.   The circulation type according to any one of claims 4 to 7, further comprising an auxiliary stirring section (38) for stirring a solid stirring object in the cylindrical container (1) in the cylindrical container (1). Mixer.   The auxiliary stirring part (38) is a motor (41) provided on the upper end side of the cylindrical container (1) and a rotation for supporting the auxiliary stirring part (38) on the lower end side in the cylindrical container (1). The circulating mixer according to claim 8, comprising a shaft (42) and blades (43) for stirring the object to be stirred on the lower end side of the rotating shaft (42).