阅读说明：本技术 搅拌机 (Mixer ) 是由 榎村真一 于 2019-09-26 设计创作，主要内容包括：谋求提供抑制在被处理流动体的处理中产生的气蚀的搅拌机。在本发明的搅拌机中,定子部(S)在其周向上具备多个贯穿部(13a)和位于相邻的贯穿部(13a)彼此之间的定子主部,关于在通过转子旋转而流动体通过上述贯穿部(13a)从上述定子部(S)的内侧向外侧喷出时进行流动体的处理的搅拌机,在定子部(S)中,将转子的面向叶片的一侧设为内壁面,将面向该叶片的相反侧的一侧设为外壁面,将设置于上述内壁面的多个贯穿部(13a)的开口设为流入开口(13b),将设置于上述外壁面的多个贯穿部(13a)的开口设为流出开口(13c),流入开口(13b)的开口面积比流出开口(13c)的开口面积大。(To provide a stirrer capable of suppressing cavitation generated in the treatment of a fluid to be treated. In the stirrer, a stator part (S) is provided with a plurality of penetrating parts (13a) and a stator main part positioned between the adjacent penetrating parts (13a) in the circumferential direction, and the stirrer performs treatment on a fluid when the fluid is ejected from the inner side to the outer side of the stator part (S) through the penetrating parts (13a) by the rotation of a rotor, in the stator part (S), one side of the rotor facing a blade is taken as an inner wall surface, the other side of the rotor facing the opposite side of the blade is taken as an outer wall surface, openings of the plurality of penetrating parts (13a) arranged on the inner wall surface are taken as inflow openings (13b), openings of the plurality of penetrating parts (13a) arranged on the outer wall surface are taken as outflow openings (13c), and the opening area of the inflow openings (13b) is larger than the opening area of the outflow openings (13 c).)

1. A stirrer comprising a stator and a rotor rotatable relative to the stator,

the rotor includes a plurality of blades and a main shaft that serves as a center of the rotation,

the stator has 1 or more stator segments,

the stator portion surrounds the blade with a main shaft of the rotor as a center,

the rotation direction of the rotor is set as the circumferential direction,

the stator portion includes a plurality of through portions in a circumferential direction thereof and a stator main portion located at least between adjacent ones of the through portions, and when the fluid is discharged from an inside of the stator portion to an outside of the stator portion through the through portions by rotation of at least the rotor of the rotor and the stator, the fluid is subjected to at least one of refinement, homogenization, emulsification, and dispersion,

it is characterized in that the preparation method is characterized in that,

the side of the stator part facing the vane is set as the inner wall surface of the stator part,

the side of the stator portion facing the opposite side of the vane is an outer wall surface of the stator portion,

openings of the plurality of through portions provided on the inner wall surface of the stator portion are inflow openings, openings of the plurality of through portions provided on the outer wall surface of the stator portion are outflow openings,

the opening area of the inflow opening is set larger than the opening area of the outflow opening.

2. A stirrer comprising a stator and a rotor rotatable relative to the stator,

the rotor includes a plurality of blades and a main shaft that serves as a center of the rotation,

the stator has 1 or more stator segments,

the stator portion surrounds the blade with a main shaft of the rotor as a center,

the rotation direction of the rotor is set as the circumferential direction,

the stator portion includes a plurality of through portions in a circumferential direction thereof and a stator main portion located between the adjacent through portions,

the fluid is ejected from the inside of the stator portion to the outside through the penetration portion by the rotation of at least the rotor of the rotor and the stator,

it is characterized in that the preparation method is characterized in that,

the side of the stator part facing the vane is set as the inner wall surface of the stator part,

the side of the stator portion facing the opposite side of the vane is an outer wall surface of the stator portion,

wherein openings of the plurality of through portions provided on an inner wall surface of the stator portion are inflow openings, openings of the plurality of through portions provided on an outer wall surface of the stator portion are outflow openings, and a space between the inflow opening and the outflow opening is an internal space of the through portions, and the internal space of the through portions has a minimum cross-sectional portion having a smaller cross-sectional area than other portions of the internal space in a middle from the inflow opening to the outflow opening,

the opening area of the outflow opening and the opening area of the inflow opening are set to be larger than the cross-sectional area of the minimum cross-sectional portion of the internal space of the penetration portion.

3. A mixer according to claim 1,

the penetrating part is at least one of a slit and a penetrating hole,

the extending direction of the main shaft of the rotor is set as an axial direction,

the slit is configured such that the axial width of the stator portion is larger than the circumferential width of the stator portion, the slit is provided with at least one of a long hole at both ends in the axial direction of the stator portion and a notch portion at one end opened in the axial direction of the stator portion,

in the slit, the width (Si) of the inflow opening is set to be larger than the width (So) of the outflow opening in the circumferential direction of the stator portion,

the area of the hole of the inflow opening is set larger than the area of the hole of the outflow opening in the through hole.

4. A mixer according to claim 2,

the penetrating part is at least one of a slit and a penetrating hole,

the slit is configured such that the axial width of the stator portion is larger than the circumferential width of the stator portion, the slit is provided with at least one of a long hole at both ends in the axial direction of the stator portion and a notch portion at one end opened in the axial direction of the stator portion,

in the slit, a width (So) of the outflow opening and a width (Si) of the inflow opening are set to be larger than a width (Sm) of the minimum cross-sectional portion of the internal space in a circumferential direction of the stator portion,

in the through-hole, an area of the hole of the outflow opening and an area of the hole of the inflow opening are set to be larger than an area of the hole of the minimum cross-sectional portion of the internal space.

5. A mixer according to any of claims 1-4,

the maximum length of the arc of the outflow opening that forms an arc in the circumferential direction of the stator portion is 0.2mm or more, and the maximum length of a string connecting both ends of the arc is 4.0mm or less.

6. A mixer according to any of claims 1-5,

the stator includes a plurality of stator portions concentric with the main shaft of the rotor in a radial direction of the stator.

Technical Field

The present invention relates to a stirrer, and more particularly, to an improvement of a stirrer used for the treatment of refining, homogenizing, emulsifying, or dispersing a fluid to be treated.

Background

Various types of mixers have been proposed as apparatuses for emulsification, dispersion, or mixing of fluids, but today, it is required to satisfactorily treat a fluid to be treated containing a substance having a small particle size such as nanoparticles.

For example, bead mills and homogenizers are known as one of widely known mixers, emulsifying machines and dispersing machines.

However, in the bead mill, the crystal state of the surface of the particles is broken, and the function is deteriorated due to the damage, which is a problem. In addition, the problem of foreign matter generation is also large, and the cost of frequent replacement or replenishment of the beads is also large.

In the high-pressure homogenizer, the problems of stable operation of the machine, large power requirements, and the like are not solved.

Further, the rotary homogenizer is used as a conventional premixer, but requires a finishing machine for further nano finishing in order to perform nano dispersion and nano emulsification, but even if it is used as a premixer, the load on the finishing machine for nano dispersion and nano finishing can be reduced by improving the performance thereof.

(Prior Art)

Patent documents 1 to 6 exemplify conventional techniques.

Patent document 1 discloses a mixer including, concentrically: a rotor that includes a plurality of cutter blades and rotates; and a stator that is laid around the rotor, the stator including a stator main portion having a plurality of slits in a circumferential direction thereof and being positioned between the adjacent slits, wherein when at least the rotor of the rotor and the stator rotates and the fluid to be processed is ejected from an inner side to an outer side of the stator through the slits, a strong shearing force is applied to the fluid to be processed, thereby refining and homogenizing the fluid.

Patent document 2 discloses a mixer including, concentrically: a rotor that includes a plurality of blades and rotates; and a stator laid around the rotor, the stator having a plurality of circular holes and rectangular through holes formed in a cylindrical side wall thereof. As in patent document 1, a stirrer is disclosed in which a shearing force is applied to homogenize a fluid to be processed when the fluid is discharged from the inside to the outside of the stator by the rotation of a rotor.

Patent document 3 discloses a method for producing a polymerized toner having a sharp particle size distribution with a small particle size by controlling the terminal speed of a stirrer and the pressure of a processing section, and patent document 4 discloses a production apparatus capable of producing an aqueous dispersion at low cost and safely by adding water, a resin material, a natural wax, and a surfactant to the aqueous dispersion and circulating a dispersing machine.

However, according to the examples shown in patent documents 3 and 4, the rotational speed of the rotor is extremely high, usually 25m/s or more, and the cavitation is a problem because the rotor is operated at 35m/s or more.

In patent document 5, by disposing a guide at the upstream portion of the rotor/stator, which is the stirring/dispersing portion, a mixture having improved mixing performance and no aggregates can be obtained, and the influence of cavitation can be reduced as a useful advantage obtained.

Cavitation is a physical phenomenon that causes generation and disappearance of bubbles in a short time due to pressure fluctuation and temperature change in a flow of a liquid. The higher the pressure of the gas dissolved in the liquid, the more sufficient the dissolution, and conversely, the lower the pressure, the lower the solubility. The higher the temperature of the gas dissolved in the liquid is, the lower the solubility is, and the lower the temperature is, the higher the solubility is.

The fluid to be processed is ejected from a rotor rotating at a high speed. At this time, the pressure of the fluid to be processed on the rotation direction side of the rotor increases, and the pressure of the fluid to be processed on the back surface of the rotor decreases.

When the fluid is discharged from the rotor and passes through the opening of the stator, the pressure is repeatedly increased and decreased, and the temperature increase in the microscopic region is also influenced, thereby causing cavitation.

The cavitation of the growth is also sometimes referred to as cavitation.

Cavitation has a great influence on mechanical shape, running state, dissolved gas, surface roughness, and the like.

Even if the process of microparticulation or the like using cavitation is favorably performed in the experimental machine, the process using cavitation often fails to be reliably reproduced when the scale is increased.

Cavitation is a process of bubble generation, bubble growth, and bubble collapse accompanying a pressure rise. When the bubble is broken, erosion is caused by energy of thousands of atmospheres.

Although the concept of evaporation is sometimes included at present, erosion due to cavitation becomes a major problem as a substantial problem. This is because, when erosion occurs, mechanical vibration causes mechanical damage compared to the original.

As a method of improving the processing capacity while suppressing the cavitation, a method of changing the rotation speed of the rotor (the rotational circumferential speed of the tip portion of the blade) is known, but it is considered effective to decrease the width of the slits and increase the number of slits, increase the number of blades of the rotor, or both, under the condition that the rotation speed of the rotor (the rotational circumferential speed of the tip portion of the blade) is constant.

However, if the width of the slit is too large, the pressure of the fluid to be processed passing through the slit is reduced, the ejection flow rate is reduced, and the processing capability is lowered. On the other hand, if the width of the slit is reduced, the discharge flow rate is increased, but if the width of the slit is too reduced, the pressure loss is increased, and the flow rate of the fluid to be processed passing through the slit is reduced, so that there is a possibility that the discharge flow cannot be generated satisfactorily or a cavitation phenomenon occurs. As a result, there is a limit to decrease the width of the slits and increase the number of slits.

In addition, in the current technique of flow analysis simulation, cavitation is unfortunately not accurately analyzed.

Further, the processing capacity of the mixer is improved by further increasing the rotation speed of the rotor. By increasing the rotation speed of the rotor, the discharge flow rate of the fluid to be processed discharged from the inside of the stator to the outside through the slits is increased, and the speed thereof is increased. In this case, the following points become problems. The sound velocity is about 340m/sec in air at normal temperature and about 1500m/sec in water, but when bubbles are mixed by cavitation, the sound velocity in water is significantly reduced.

The sound velocity of water having a void ratio of 0.2 including bubbles is 30m/sec or less, and the sound velocity of water having a void ratio of 0.4 is about 20 m/sec.

In patent documents 4 and 5, it is considered that the velocity of the intermittent jet flow passing through the stator is close to the sound velocity of water containing the air bubbles, and if the velocity exceeds the sound velocity, a shock wave is generated to cause damage to the machine. Therefore, the problem of the shock wave must be solved by suppressing the generation of bubbles caused by cavitation as much as possible.

Patent document 6 describes a homogenizer including a stator having a plurality of pulverizing blades of circular shape on the upper and lower surfaces, and 2 rotors having a plurality of stirring blades meshing with the pulverizing blades of the stator in the diameter direction and an opening for taking in a material to be pulverized, the rotors being fixed to the upper and lower surfaces of the stator by sandwiching the stator with a shaft, the liquid or the liquid and the powder being stirred by the rotation of the rotors, and a protective cover being provided at the opening of the rotors.

However, patent document 6 does not consider the suppression of the cavitation sufficiently, and the problem of cavitation cannot be solved because the increase in power is significant and the pressure distribution width of the processing portion is enlarged.

Prior art documents

Patent document

Patent document 1: japanese laid-open patent publication No. 60-31819

Patent document 2 US3,894,694

Patent document 3: japanese laid-open patent publication 2002-221824

Patent document 4: japanese laid-open patent publication No. Hei 7-8772

Patent document 5 EP3069786A1

Patent document 6: japanese patent laid-open No. 2005-177701

Disclosure of Invention

Problems to be solved by the invention

Accordingly, the present invention is intended to provide a stirring apparatus that can effectively stir a fluid to be treated to promote the treatment of pulverization, homogenization, or emulsification, and that can suppress the occurrence of cavitation.

Means for solving the problems

The present invention has been made in view of a new point of increasing a substantial speed difference between a rotor as a rotating body and a fluid to be processed facing a fixed stator, and has resulted in an improvement of a stirrer. Specifically, by newly examining the cross-sectional shape of the through portion provided in the stator, it is possible to provide an agitator capable of improving the relative velocity difference of the fluid to be treated. The present inventors have also found that a shear force can be efficiently applied to a fluid to be processed ejected from the inside to the outside of a stator through a penetration portion while suppressing cavitation by improving a relative velocity difference of the flow of the fluid to be processed and reducing a pressure loss of the fluid to be processed by newly examining the cross-sectional shape of the penetration portion provided in the stator, and have completed the present invention.

The present invention provides an agitator including a stator and a rotor rotatable with respect to the stator, the rotor including a plurality of blades and a main shaft that serves as a center of the rotation, the stator including 1 or more stator portions that surround the blades about the main shaft of the rotor, the stator portion including a plurality of through portions and a stator main portion located at least between adjacent through portions in a circumferential direction of the rotor, the agitator configured to perform at least one of refinement, homogenization, emulsification, and dispersion of a fluid when the fluid is ejected from an inner side to an outer side of the stator portion through the through portions by rotation of at least the rotor of the rotor and the stator, the fluid being provided with a device having the following configuration.

That is, the stator portion is characterized in that a side facing the vane is an inner wall surface of the stator portion, a side facing an opposite side of the vane is an outer wall surface of the stator portion, openings of the plurality of through portions provided on the inner wall surface of the stator portion are inflow openings, openings of the plurality of through portions provided on the outer wall surface of the stator portion are outflow openings, and an opening area of the inflow openings is set to be larger than an opening area of the outflow openings.

The present invention also provides a stirrer including a stator and a rotor rotatable with respect to the stator, the rotor including a plurality of blades and a main shaft that serves as a center of the rotation, the stator including 1 or more stator portions that surround the blades about the main shaft of the rotor, the stator portion including a plurality of through portions and a stator main portion located between adjacent through portions in a circumferential direction of the rotor, the stirrer including at least one of the rotor and the stator, the stator portion including a plurality of through portions and a stator main portion located between the through portions, the stator portion being configured to rotate and to discharge a fluid from an inner side of the stator portion to an outer side of the stator portion through the through portions.

That is, the stator is characterized in that a side of the stator facing the vane is an inner wall surface of the stator, a side of the stator facing an opposite side of the vane is an outer wall surface of the stator, openings of the plurality of through portions provided on the inner wall surface of the stator are inflow openings, openings of the plurality of through portions provided on the outer wall surface of the stator are outflow openings, and a space between the inflow opening and the outflow opening is an inner space of the through portion, the inner space of the penetration portion has a minimum cross-sectional portion having a cross-sectional area smaller than that of the other portion of the inner space in the middle of the flow-in opening to the flow-out opening, the opening area of the outflow opening and the opening area of the inflow opening are set to be larger than the cross-sectional area of the minimum cross-sectional portion of the internal space of the penetration portion.

Further, in the present invention, it is possible to provide the agitator, wherein the penetrating portion is at least one of a slit and a penetrating hole, an extending direction of the main shaft of the rotor is set to be an axial direction, the slit is configured such that a width of the stator portion in the axial direction is larger than a width of the stator portion in the circumferential direction, the slit is provided with at least one of a long hole at both ends in the axial direction of the stator portion and a cutout portion at one end opened in the axial direction of the stator portion, a width (Si) of the inflow opening is set to be larger than a width (So) of the outflow opening in the circumferential direction of the stator portion in the slit, and an area of the hole of the inflow opening is set to be larger than an area of the hole of the outflow opening in the penetrating hole.

Further, in the present invention, it is possible to provide the agitator, wherein the penetrating portion is at least one of a slit and a penetrating hole, the slit is configured such that a width of the stator portion in an axial direction is larger than a width of the stator portion in a circumferential direction, the slit is provided with at least one of a long hole at both ends in the axial direction of the stator portion and a cutout portion at one end opened in the axial direction of the stator portion, a width (So) of the outflow opening and a width (Si) of the inflow opening are set to be larger than a width (Sm) of the minimum cross-sectional portion of the internal space in the circumferential direction of the stator portion, and an area of the outflow opening and an area of the inflow opening in the penetrating hole are set to be larger than an area of the hole of the minimum cross-sectional portion of the internal space.

In addition, in the present invention, it is possible to provide the agitator in which the maximum length of the arc of the outflow opening that is in the shape of an arc in the circumferential direction of the stator portion is 0.2mm or more, and the maximum length of the string connecting both ends of the arc is 4.0mm or less.

Further, in the present invention, it is possible to provide the agitator, wherein the stator includes a plurality of the stator portions concentrically with the main shaft of the rotor in a radial direction of the stator.

ADVANTAGEOUS EFFECTS OF INVENTION

The stirring device can be provided which can effectively stir a fluid to be treated to promote the treatment of pulverization, homogenization, or emulsification, and which can suppress the occurrence of cavitation.

That is, the above problem is solved by making the moving speed of the fluid on the outflow opening side of the penetration portion faster than the inflow opening side of the penetration portion with respect to the fluid that is stirred by the rotor and discharged from the inside of the stator to the outside of the stator through the penetration portion of the stator.

In an embodiment of the present invention, the gap between the stator and the rotor is set to be a minute gap, and the penetrating portion is substantially opened and closed by the relative rotation of the rotor with respect to the stator, so that the fluid is intermittently discharged from the inflow opening toward the outflow opening of the stator through the penetrating portion, whereby a strong shearing force is applied to the fluid to refine and homogenize the fluid, and the occurrence of cavitation can be suppressed.

In particular, the present invention can provide a mixer capable of more efficiently performing shearing.

In addition, the present invention can efficiently perform the shearing, and as a result, can realize extremely fine dispersion and emulsification such as nano dispersion and nano emulsification.

Further, the present invention can provide a stirrer capable of obtaining particles having a narrow particle size distribution and uniform particle size.

However, the present invention is not limited to the following embodiments: the gap between the stator and the rotor is set to be a minute gap, the penetration portion is substantially opened and closed by the relative rotation of the rotor with respect to the stator, and the fluid body is intermittently ejected from the inflow opening toward the outflow opening of the stator through the penetration portion, thereby imparting a strong shearing force to the fluid body to refine and homogenize the fluid body.

That is, the present invention can perform the above-described treatment in which cavitation is suppressed by improving the form of the through-portion as described above, by providing a sufficient space between the stator and the rotor, such that the through-portion continuously discharges the fluid from the inlet opening of the stator toward the outlet opening, rather than substantially opening and closing the through-portion by the relative rotation of the rotor with respect to the stator.

Specifically, the minute gap is set to be a gap between the stator and the rotor of 0.2mm to 2mm, and the present invention can perform stirring processing with less influence of cavitation in refining, homogenization, and emulsification even for a non-minute gap exceeding 2mm between the stator and the rotor.

Drawings

FIG. 1A is an enlarged sectional view of a main part of a mixer 1 suitable for carrying out the present invention, and FIG. B is a sectional view taken along line a-a of the main part of the above-mentioned section (A).

Fig. 2 is an enlarged cross-sectional view of an embodiment of a stator of a mixer 1 to which the present invention is applied.

Fig. 3(a) is an enlarged view of a main part of a mixer 100 suitable for carrying out the present invention.

Fig. 4(a) to (D) are perspective views each showing an example of a stator of the agitator 100 suitable for carrying out the present invention.

Fig. 5(a), (B), (C), and (D) are explanatory views each showing an embodiment of a stator of a stirrer to which the present invention is applied, each showing an enlarged longitudinal cross section of a main portion (cut along a circumferential direction of the stator), and also showing a state in which a penetrating portion penetrating above the enlarged cross section of the main portion is viewed from the front (in a plan view in each of fig. 5), and (F) is an explanatory view showing a positional relationship of a blade with respect to the stator shown in (a), (B), (C), and (D).

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1(a) shows an example of a stirrer 100 suitable for carrying out the present invention, and fig. 1(B) and 2 show an example of applying the present invention to the stirrer 100 of fig. 1 (a).

In fig. 1, reference numeral 1 denotes a housing, and a stator 3 is fixed to a suction cover 2. The suction cover 2 is provided with a suction port 4, and the casing 1 is provided with a discharge port 5. The main shaft 7 is rotatably provided through a shaft seal device 6 provided in the housing 1. A rotor 8 is fixed to the end of the main shaft 7 by a nut 9.

The rotor 8 is provided with a plurality of rotor blades 10 intermittently arranged in the circumferential direction supported by a shroud 11. The stator 3 is provided with stator cutters 12 and 13, which are intermittently provided along the circumferential direction so as to sandwich the rotor cutter 10 from both sides concentrically in the radial direction with gaps of S1 and S2.

The circumferential direction coincides with the rotational direction of the rotor 8 (of the main shaft 7).

Hereinafter, the plurality of stator blades 13 arranged outside the circle formed by the plurality of rotor blades 10 will be referred to as an outer stator blade 13, respectively, as necessary. The plurality of stator blades 12 arranged inside the circle formed by the plurality of rotor blades 10 are referred to as inner stator blades 12, respectively, as necessary.

In the example shown in fig. 1 and 2, the outer stator blades 13 correspond to the "stator main portion" in the claims, and the space between the adjacent outer stator blades 13 constitutes the through portion 13 a.

In the stator 3, an opening facing the center (main shaft 7) side of the rotor 8 of the through portion 13a is an inflow opening 13b of the fluid (fluid to be processed), and an opening facing the outside opposite to the center of the rotor 8 is an outflow opening 13c of the fluid.

The opening area of the inflow opening 13B is set larger than the opening area of the outflow opening 13c (fig. 1B). That is, the penetrating portion 13a is a space with a narrowed end, in which the cross section (cross section of a plane orthogonal to the moving direction of the fluid) gradually decreases from the inflow opening 13b side toward the outflow opening 13c side.

In this example, the inner stator blades 13 constitute the inner stator main portions, and the spaces between adjacent inner stator blades 12 constitute the inner penetration portions 12 a.

The operation of the entire mixer 100 shown in fig. 1(a) will be described.

When the rotor 8 is rotated by driving the main shaft 7, the object to be treated is sucked from the suction port 4 by the pump action of the rotor cutter 10, passes through the spaces between the stator cutter 12, the rotor cutter 10, and the stator cutter 13, flows out to the outside, and is discharged from the discharge port 5. During this period, the fluid to be treated is subjected to the high-speed shearing action between the stator blades 12 and 13 and the rotor blade 10, thereby being subjected to the pulverization, homogenization, emulsification, and dispersion treatment.

However, in the conventional agitator of the type shown in fig. 1(a), although the operation is stable when the pressure on the suction side is high, cavitation is generated when the pressure on the suction side is lowered, or noise and vibration are generated when the conditions are deteriorated, which causes a disadvantage of significantly lowering the performance. Therefore, there is provided a dispersing device in which the blades 17 are provided on the center side (hub 18 side) without any problem even if the pressure on the suction side is lowered.

In the example shown in fig. 1B, the inner inflow opening 12B of the inner penetration portion 12a facing the center side of the rotor 8 and the inner outflow opening 12c facing the opposite side of the center of the rotor 8 have substantially the same opening area, but in particular, in the inner penetration portion 12a, the opening area of the inner inflow opening 12B is made larger than the opening area of the inner outflow opening 12c, whereby more effective processing of the fluid can be achieved (fig. 2).

The gaps between adjacent rotor blades 10 may be configured similarly to the above-described penetration portions 12a and inner penetration portions 13a (fig. 2).

Although not shown, the stator 3 may be further provided with a set of third stator blades inside the circle formed by the inner stator blade 12 set. The stator 3 may be formed by arranging a plurality of stator blades in a circle of 4 or more sets (in multiple stages). Further, the rotor blade group can be multiplexed in accordance with the multiplexing of the stator blade group.

In the example shown in fig. 1 and 2, the outer stator blade 13 group constitutes 1 stator portion S (outer stator portion S), and the inner stator blade 12 group constitutes another 1 stator portion S (inner stator portion S).

Instead of configuring 1 stator S with the outer stator blade 12 group and the inner stator blade 12 group, 1 stator S may be configured as 1 cylindrical body.

Specifically, the stator 3 is not formed by arranging the plurality of stator blades 12 and 13 shown in fig. 1 and 2 in the circumferential direction (radial direction) of the stator 3, and the stator 3 includes 2 or more cylindrical bodies arranged concentrically with respect to the main shaft 7 of the rotor 8.

The tubular body of the stator 3 can be formed as the stator portion S (the outer stator portion S corresponding to the outer stator blade 13 group and the inner stator portion S corresponding to the inner stator blade 12), and the penetration portion 13a and the inner penetration portion 12a can be formed as holes (through holes) penetrating the side portions of the stator portion S.

The stator 3 may be implemented by including only the outer cutter 13 group and not including the inner stator cutter 12 group, that is, by including only 1 stator unit S (fig. 5).

When the above-described penetrating portion 13a or the inner penetrating portion 12a is a hole, the contour of (the opening of) the hole may be a perfect circle or an oblong circle. The contour of the through portion is not limited to a circle, and a polygon having a shape equal to or larger than a triangle such as a rectangle, a circle, a curve, or a combination of a curve and a straight line may be used as the contour.

As described above, when the stator portion S is formed into a cylindrical body and the above-described through-hole 13a and inner through-hole 12a are formed as holes, a region (range) of the stator portion S located between the adjacent holes corresponds to "stator main portion" in the claims.

Further, since the width of the stator 3 in the axial direction (thrust direction) is relatively large with respect to the width of the stator 3 in the circumferential direction, a structure more appropriately called a slit than a hole can be used as the penetrating portion. In this case, the slits may be slits having both ends in the axial direction of the stator 3, or may be notches having one end opened.

The slit may extend linearly in the axial direction of the stator 3, or may extend spirally in the axial direction.

Fig. 3 shows an example of a stirrer 100 suitable for implementing the present invention by using the above-described penetrating portion as a slit.

The fluid to be treated in fig. 3 is introduced into the mixer 100 as indicated by the hollow arrow, and is discharged after treatment.

The stator 140 is fixed to an inlet 155 of the housing 160, and the rotor 145 is attached to a rotatable shaft 170 driven by a motor (not shown). In the present embodiment, the rotor is a multistage rotor having blades 145a arranged to rotate inside the stator 140 and blades 145b for rotating outside the stator 140. The shaft 170 extends through the shaft seal 185.

A perspective view of the stator 140 is shown in fig. 4. Various forms having a through hole of a perfect circle, a through hole of a rectangular shape (140 a, 140b, 140C in fig. 4(a) to (C)), and a through hole being a slit (140D in fig. 4 (D)).

The guide 125 that feeds the fluid to be processed while substantially pressurizing the fluid is disposed at the upstream port 165 of the agitation main unit 135, in addition to the agitation main unit 135. The guide 125 is disposed coaxially with the rotor 145 and is rotated simultaneously with the rotor 145.

When the guide 125 rotates, a pressure difference is generated in which the fluid to be processed is introduced inward toward the housing 160. Therefore, the guide 125 can function as a small booster pump for reducing the Net Positive Suction Head (NPSH) required for the agitation main portion 135, whereby cavitation can be further reduced.

Fig. 5(a) to (E) show specific examples of the penetration portion provided in the stator of the agitator shown in fig. 1(B) and fig. 2 to 4. Although the blades 17 of the rotor 8 are omitted in fig. 5(a) to (E), fig. 5(F) shows the tip portions of the blades 17 that rotate relative to the stator 3 (stator portion S). In fig. 5(a) to (F), r represents the rotation direction of the blade 17.

In the examples of fig. 5(a) to (F), the stator 3 includes only one (outer stator portion S) of the stator portion S described above, and the rotor 8 does not include the rotor blade 10 (fig. 1 and 2) described above. However, as described above, the stator 3 may be provided with the stator portion S in multiple stages, or may be provided with the rotary cutter 10. The inner stator portion S may be configured with the inner through portion 12a and the inner through portion 12a as in fig. 5(a) to (F), and in this case, it is sufficient to read the inner stator portion S as shown in parentheses.

In each example of fig. 5, the distance S3 (fig. 5F) between the stator portion S and the blade 17 of the rotor 8 is preferably a minute distance of 0.2mm or more and 2mm or less, but may be a non-minute distance of 2mm or more. In the example shown in fig. 1B and 2, the interval between the inner stator group and the blade 17 may be the minute interval or the non-minute interval.

In the example shown in fig. 1(B) and 2, the clearances S1 and S2 between the rotary cutter 10 and the outer stator portion S and between the rotary cutter 10 and the inner stator portion S may be set to the minute clearance or the non-minute clearance, respectively.

Note that, unlike fig. 5F, the blade 17 shown in fig. 5F is an example, and may have a structure in which the rake face 17b is parallel to the surface 17c on the opposite side thereof, an inclination angle (left-right in fig. 5F) of the rake face 17b and the surface 17c on the opposite side thereof may be symmetrical, or the end face 17a may be inclined with respect to the rotation direction of the blade 17, that is, an angle (corner) formed by the rake face 17b with respect to the end face 17a may be an angle (corner) formed by the end face 17a and the surface 17c on the opposite side thereof, and the rotation trajectories of both angles may not coincide (not shown).

In the example shown in fig. 5(a) and (B), the width So of the inflow opening 13B is smaller than the width Si of the outflow opening 13c in the circumferential direction of the stator 3.

In particular, it is preferable that the maximum length of the arc of the outflow opening 13c, which is in the form of an arc in the circumferential direction of the stator portion S (the circumferential direction of the stator 3), is 0.2mm or more and the maximum length of the chord connecting both ends of the arc is 4.0mm or less.

The width between the side (the inner side end 13e) of the rotating vane 17 facing the forward inclined surface 17b and the opposite side (the forward side end 13f) thereof gradually becomes narrower from the inflow opening 13b toward the outflow opening 13 c. Specifically, the back end 13e and the near-front end 13f of the through portion 13a, which is a truncated cone, are preferably set to have an angle θ (inclination angle) of 1 to 45 degrees with respect to the center line of the through portion 13a (the two-dot chain line in fig. 5 a), that is, a straight line passing through the center of the inflow opening 13b and the center of the outflow opening 13 c.

In the example of fig. 5a, the penetration portion 13a is a conical (truncated cone-shaped) space tapered from the inflow opening 13b toward the outflow opening 13 c. Therefore, it is preferable that the angle θ (inclination angle) with respect to the center line is set as described above with respect to the generatrix of the truncated cone penetration portion 13 a.

Instead of the above-described truncated cone, the penetrating portion 13a may be a truncated pyramid, and fig. 5(B) shows an example in which the penetrating portion 13a is a truncated pyramid. In the penetrating portion 13a shown in fig. 5(B), the inclined surfaces of the pair of front and rear portions with respect to the rotation direction are the back side end 13e and the near front side end 13f, and the included angle with respect to the center line is the same as the generatrix of fig. 5 (a).

The penetrating portion 13a (12a) may be implemented as a structure including a minimum cross-sectional portion 13d having a smaller cross-sectional area than the inflow opening 13b and the outflow opening 13C in a section from the inflow opening 13b to the outflow opening 13C (fig. 5C to E). Specifically, the penetrating portion 13a gradually decreases in cross-sectional area from the inflow opening 13b toward the minimum cross-sectional portion 13 d. In addition, the penetrating portion 13a gradually increases in cross-sectional area from the minimum cross-sectional portion 13d toward the outflow opening 13 c. The minimum cross-sectional portion 13d is a narrowed (constricted) portion provided in the penetrating portion 13 a.

The minimum cross-sectional portion 13d may be an annular ridge portion (not shown) having no width between the inlet opening 13b side and the outlet opening 13C side, and the minimum cross-sectional portion 13d may be implemented as a minimum diameter section having a constant width between the inlet opening 13b side and the outlet opening 13C side (fig. 5(C) to (E)).

In the case where the minimum cross-sectional portion 13d is provided, the outflow opening 13c may be smaller in cross-sectional area than the inflow opening 13b, and the inflow opening 13b may also be smaller in cross-sectional area than the outflow opening 13c as long as the effects of the present invention can be obtained.

In the examples shown in fig. 5(C) to (E), the penetration portion 13a includes a minimum cross-sectional portion 13d having a width Sm smaller than the width Sm of the inflow opening 13b and the outflow opening 13C in the section from the inflow opening 13b to the outflow opening 13C with respect to the circumferential direction of the stator 3 (the rotation direction of the rotor 8). Specifically, in the above-described circumferential direction of the stator 3, the penetration portion 13a gradually decreases in width from the inflow opening 13b toward the minimum cross-sectional portion 13 d. In the circumferential direction of the stator 3, the width of the through portion 13a gradually increases from the minimum cross-sectional portion 13d toward the outflow opening 13 c.

The penetrating portion 13a may have a circular, i.e., drum-shaped cross section in all sections from the inflow opening 13b to the outflow opening 13C (fig. 5C), or may have a rectangular cross section in all sections (fig. 5D).

When the cross-sectional shape of all the sections of the through-portion 13a is a quadrangle, the ratio of the sides of the quadrangle may be changed vertically and horizontally (fig. 5E). In the example shown in fig. 5(E), the minimum cross-sectional portion 13d forms the minimum cross-sectional section, but at the back end 13E of the through portion 13a, the minimum cross-sectional section formed by the minimum cross-sectional portion 13d and the section between the inflow opening 13b and the minimum cross-sectional portion 13d extends parallel to the center line without a step, and is inclined so as to gradually become distant from the center line from the minimum cross-sectional portion 13d to the outflow opening 13 c. On the other hand, in the example shown in fig. 5(E), the section from the inflow opening 13b to the smallest cross-sectional portion 13d is inclined so as to gradually approach the center line, and the smallest cross-sectional section formed by the smallest cross-sectional portion 13d extends in parallel with the center line without a step between the smallest cross-sectional section and the section from the smallest cross-sectional portion 13d to the outflow opening 13 c.

The penetrating portion 13a in fig. 5(E) may be a hole, but is preferably implemented as a slit.

The cross-sectional area of the penetration portion 13a having the minimum cross-sectional portion 13d may be gradually reduced from the inflow opening 13b toward the minimum cross-sectional portion 13d, and the cross-sectional area of the penetration portion 13a not having the minimum cross-sectional portion 13d may be gradually reduced from the inflow opening 13b toward the outflow opening 13c, and in either case, the cross-section of the entire section of the penetration portion 13a may be a polygon of a triangle or a pentagon or more, or may be a shape of a curve other than a circle, or a combination of a curve and a straight line, or a section having a cross-sectional shape different from that of the other sections may be present in the entire section of the penetration portion 13a, and these various changes may be made. The point that the above-described various modifications can be made is the same as in the embodiment shown in fig. 1(B) and 2.

(conclusion)

According to the present invention, a novel stirrer in which the occurrence of cavitation is further suppressed can be provided. Further, a practically significant effect can be obtained only by changing the shape of the through-hole of the stator.

Although the conventional agitator 100 of the type shown in fig. 1(a) attempts to improve the cavitation from the side surface of the rotor, the effect of reducing the cavitation is confirmed, but the effect is not sufficient, and therefore the inventors have attempted the improvement result from the side surface of the stator and confirmed the great effect.

In the stator of the agitator 100 shown in fig. 2 to which the present invention is applied, a plurality of penetrating portions are provided in a cylindrical stator having a cylindrical cross section, and the fluid to be treated is ejected from the inner surface to the outer surface of the stator by the rotation of the rotor, and the opening portion of the inner wall surface is defined as an inflow opening, the outer wall surface of the stator is defined as an outflow opening, and the opening area of the inflow opening is set to be larger than the opening area of the outflow opening.

In the conventional stator, the inflow opening area and the outflow opening area of the through portion are equal to each other or the outflow opening area is large, but the discharge flow from the rotor is difficult to discharge due to pressure loss, and occurrence of cavitation or cavitation is often observed.

In addition, the discharge flow from the rotor is bent at a right angle at the stator inflow opening portion. If bent at a right angle, an infinitely close vacuum is produced in the simulation.

By making the inflow opening area larger than the outflow opening area, the pressure loss is greatly reduced, and the fluid to be treated is more smoothly introduced into the penetration portion of the stator 3 and is more rapidly discharged from the outflow opening portion.

In addition, the problem of the discharge flow bent at a right angle can be avoided, and the problem of cavitation can be significantly reduced.

As a result, the effect of the shearing force is greatly improved, the fluid to be treated is efficiently treated, and the machine can be stably operated.