Fluid mixing device

Abstract

To provide an agitation device of fluid which can agitate fluid by generating the excellent convective flow in the entire fluid container even when the fluid has the large agitation resistance.SOLUTION: An agitation device comprises: a fluid container which stores fluid; a rotary shaft which is installed in the fluid container and extends in the substantially vertical direction; a first agitation blade 14, a second agitation blade 16, and a third agitation blade 18 which are attached to the rotary shaft and agitate the fluid in the fluid container. The agitation blades are provided in 3 stages with a prescribed interval in the axial direction of the rotary shaft. The agitation blades of the respective stages have blade surfaces 40, 42, 44, 46, 48, 50 having the prescribed inclination with respect to the rotation surface over the total length in the extending direction from the rotary shaft, and are divided into partial inclined parts 32, 33 having the different inclination states of the respective blade surfaces depending on a distance region in the extending direction, and the blade surfaces are set such that the inclination directions with respect to the rotation surface are opposite to each other in the partial inclined parts adjacent to each other.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a fluid agitator, and more particularly to a fluid agitator that agitates a fluid by rotating a blade in a fluid container. [Background technology]

[0002] For fluids, especially those with relatively high resistance when stirred, such as sherbet-like fluids (a mixture of water and ice particles), it is necessary to adequately stir the fluid against the high resistance and maintain an appropriate mixed state.

[0003] For example, the sherbet-like fluid can be used to remove deposits from pipes such as water supply and sewerage systems that have accumulated on their interior due to long-term use.

[0004] That is, a sherbet-like fluid containing fine ice particles in saltwater is injected under pressure into the pipeline, causing the fluid to move, and the ice particles in the fluid collide with the deposits in the pipeline, scraping them off, which are then discharged from the pipeline along with the fluid. This provides a highly safe method of cleaning the inside of the pipeline without using chemicals.

[0005] In order to increase the effectiveness of scraping away deposits inside the pipelines, the sherbet-like fluid used for this type of pipeline cleaning needs to be a fluid with a high ratio of solid ice particles to saltwater, i.e., a sherbet-like fluid with an ice content of 70% or more.

[0006] For example, in Patent Document 1, ice particles produced by an ice maker are poured into a storage tank (fluid container) containing salt water, and a sherbet-like fluid is produced by stirring the ice with a stirring device inside the storage tank. The stirring device is composed of a drive unit attached to the top of the storage tank and stirring blades attached to its rotating shaft, and the stirring blades have the form of rod-shaped bodies fixed to the top, middle, and bottom of the rotating shaft (the tips of the blades are fixed to each other by the rod-shaped bodies).

[0007] However, the agitator disclosed in Patent Document 1 may experience problems with agitation in a storage tank when the fluid has high agitation resistance, such as in the case of a sherbet-like fluid with a high ice content. Specifically, as the fluid's ice content increases, ice particles, which have a lower specific gravity than saltwater, crystallize at the top of the storage tank and form large clumps. This increases the load resistance of the drive unit that rotates the agitator blades, potentially preventing continuous and proper agitation. Furthermore, crystallized ice particles may adhere to the agitator blades, causing the agitator blades and the crystallized ice particles to rotate together, a phenomenon known as co-rotation.

[0008] In the kneading device disclosed in Patent Document 2, an inner stirring means and an outer stirring means are provided for a kneading vessel. The inner stirring means is a spiral screw located at the center of the kneading vessel, and the outer stirring means is a blade extending in the vertical direction and located near the inner wall of the kneading vessel. This blade rotates coaxially with the screw on the outside of the screw along the inner wall of the kneading vessel in the opposite direction to the screw. The angle of the blade relative to the rotation direction is changed at a height position approximately halfway up the kneading vessel.

[0009] The screw of the inner agitating means propels the material in the kneading vessel upward and outward as it rotates, while the blade of the outer agitating means propels the material to be kneaded downward inward at the upper part of the blade and propels the material to be kneaded slightly upward inward at the lower part of the blade as it rotates.

[0010] The agitator blade attached to the rotating shaft disclosed in Patent Document 3 has blades spaced apart at two predetermined locations in the extension direction from the rotating shaft. Each blade is angled in an opposite direction relative to the rotation plane perpendicular to the rotating shaft. That is, each blade applies a force in an opposite direction to the material being agitated as the agitator blade rotates. Therefore, the material being agitated is moved in the opposite direction to agitate the material. In addition, a mechanism for moving the rotating shaft up and down is provided, making it possible to apply a force in the above direction at different depths. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Publication No. 2020-159640 [Patent Document 2] Patent No. 3001387 [Patent Document 3] Japanese Unexamined Patent Publication No. 49-122063 Summary of the Invention [Problem to be solved by the invention]

[0012] In the technology of Patent Document 2, the fluidized object is propelled upward and outward by the screw, and is propelled mainly downward and inward by the blade. However, this configuration requires a drive system (gears or the like arranged near the container) to rotate the two elements in opposite directions, which inevitably makes the structure complicated.

[0013] Furthermore, since both the screw and the blade move the object to be moved as a relatively large mass, for example, if the object to be moved is something like sherbet containing ice, there is a possibility that masses may form because there is no simultaneous cutting movement in the depth direction of the container.

[0014] Furthermore, the agitator blade disclosed in Patent Document 3 has two blades spaced apart in the extension direction, with a bladeless area between them. Therefore, when the target material is agitated, it is inevitable that insufficient agitation will occur in the bladeless area. Furthermore, since the target material cannot be simultaneously moved throughout the entire depth direction even when the rotating shaft is moved up and down, it is not desirable to eliminate the insufficient agitation area throughout the entire storage container. For example, in the case of a fluid with high agitation resistance, such as a sherbet-like fluid with a high ice content, it is thought that a large area will become stagnant.

[0015] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a fluid stirring device that can generate good convection throughout the fluid container and stir the fluid, even in the case of a fluid with high stirring resistance. [Means for solving the problem]

[0016] In order to achieve the above object, the fluid agitator according to claim 1 is A sherbet-like mixture of salt water and ice particles A stirring device having a fluid container that contains a fluid, a rotating shaft that is installed in the fluid container and extends in a substantially vertical direction, and a stirring blade that is attached to the rotating shaft and stirs the fluid in the fluid container, The stirring blade is At predetermined intervals in the axial direction of the rotary shaft At least three levels It is provided, The stirring blades at each stage are a blade surface having a predetermined inclination with respect to the plane of rotation over the entire length in the extension direction from the rotation axis; The blade surface is divided into partial inclined portions each having a different inclination state depending on the distance region in the extension direction, The blade surfaces are inclined in opposite directions with respect to the rotation surface at adjacent inclined portions. And, The partial inclination portion of the stirring blade of each stage is a first inclined portion inclined in a direction in which the blade surface pushes the fluid downward by rotation of the stirring blade up to a predetermined distance from the rotation shaft, and a region on the tip side of the first inclined portion inclined in a direction in which the blade surface pushes the fluid upward by rotation, The first inclined portion and / or the second inclined portion of the adjacent stirring blades in the upper and lower stages have different inclination angles. It is characterized by:

[0017] According to this configuration, first, because the agitator blades are arranged in multiple stages in the axial direction, the fluid can be simultaneously mixed in the depth direction of the container by cutting it in the rotational direction in multiple stages. Furthermore, each agitator blade is divided into partial inclined sections with different inclinations of the blade surface. That is, the blade surface is present throughout the entire extension direction of each agitator blade, but adjacent partial inclined sections have inclinations in opposite directions. Therefore, each partial inclined section in each stage can simultaneously push the fluid (e.g., a sherbet-like fluid containing ice particles) in different directions at each depth position within the fluid container. Therefore, when the agitator blade is rotated, the target fluid is subjected to pressing forces in different directions from the blade surface of each of the multiple partial inclined sections in the depth direction and radial direction. In particular, at the boundary between adjacent partial inclined sections, the fluid is pushed and moved in opposite directions relative to the rotational surface, and therefore the fluid is also subjected to shear forces in those areas. This results in more complex mixing throughout the container, creating a good mixing state and maintaining the homogeneity of the fluid. Furthermore, with this configuration, the first inclined portion of the agitator blade of each stage pushes the fluid downward into the fluid container, and the second inclined portion pushes the fluid upward into the fluid container. This force is then applied to the fluid simultaneously by the agitator blades of each stage. That is, forces in the above directions are applied to the fluid simultaneously at different depth positions in the fluid container. Therefore, the fluid as a whole flows downward in the region close to the rotation axis within the container and upward in the region close to the wall of the container, thereby achieving accurate convection of the fluid within the container. As a result, the fluid within the container is well agitated by convection that draws the fluid from the periphery toward the center, and this state is maintained.

[0018] The fluid agitator according to claim 2 is the fluid agitator according to claim 1, The first and second inclined portions at the top are each set to have a smaller inclination angle than the first and second inclined portions at the lower stages. It is characterized by:

[0020] The fluid agitator according to claim 3 is Section 2 In the fluid agitation device described in The first and second inclined portions of the lowest stirring blade are set to have smaller inclination angles than the first and second inclined portions of the second stirring blade from the bottom. It is characterized by the following.

[0022] The fluid agitator according to claim 4 is the fluid agitator according to any one of claims 1 to 3, Between the partial inclined sections of the stirring blade having different inclination angles, intermediate inclined sections in which the inclination angle gradually changes are provided. It is characterized by:

[0023] This configuration allows: In the intermediate inclined portion, the inclination of the blade surface of the adjacent inclined partial portions changes gradually and continuously, which reduces the rotational resistance of the agitator blade to the fluid during rotation. In other words, the inclination of the adjacent inclined partial portions gradually changes in the opposite direction, so that the fluid flows at the intermediate inclined portion, which is the boundary portion, and moves more smoothly. This makes it possible to suppress the rotational resistance of the agitator blade. Therefore, in the case of a target fluid for which it is more desirable to reduce the agitation resistance than to generate shear forces at the boundary portion between adjacent inclined partial portions, the presence of this intermediate inclined portion suppresses the rotational resistance, and also maintains good agitation and convection of the fluid. .

[0025] The fluid agitator according to claim 5 is the fluid agitator according to any one of claims 1 to 4, The length in the extension direction of the partially inclined portion present for each step and for each distance from the rotation axis is set separately and arbitrarily.

[0026] With this configuration, it is possible to obtain the same effect as the configuration of changing the inclination of the partially inclined portion of claim 4 by changing the length of the partially inclined portion in the extension direction. That is, when a large pressure is applied to the fluid upward or downward in the region close to the rotation axis, this can be achieved by making the length of the partially inclined portion longer than the partially inclined portions located on the outer side. As a result, similar to the fluid stirring device of claim 4, it is possible to achieve good stirring and convection within the container depending on the viscosity and type of the fluid.

[0027] The fluid agitation device according to claim 6 is Any one of items 1 to 5 In the fluid agitation device described in The length L1 of the first inclined portion in the extension direction is characterized by satisfying L1=L / √2, where L is the total length of the stirring blade.

[0028] With this configuration, the volume of fluid pushed downward into the container by the first inclined portion and the volume of fluid pushed upward into the container by the second inclined portion can be made approximately equal, which eliminates strain on the fluid movement within the fluid container, achieves more accurate convection of the fluid, and achieves good agitation and homogenization. [Effects of the Invention]

[0029] According to the fluid agitator of the present invention, the fluid in the fluid container can be subjected to different pressing forces from the blade surface depending on the position in the extension direction of the agitator blade and on the region in the axial direction of the rotation shaft. This operation is performed simultaneously at multiple positions in the depth direction of the fluid container, thereby complexly mixing the fluid in the container and achieving a more homogeneous state, and maintaining that state. Therefore, even a sherbet-like fluid with a high ice content, which is difficult to manage, can be well agitated and maintained in that state, ensuring high quality in cleaning work using this device. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a schematic cross-sectional view showing an embodiment of a fluid agitation device according to the present invention; [Figure 2] 2 shows an explanatory diagram of the stirring blade in the fluid container of FIG. 1. [Figure 3] FIG. 3 shows a side view of the stirring blade shown in FIG. 2. [Figure 4] A conceptual diagram of the stirring blade is shown in Figure 2. [Figure 5] 5 shows a cross-sectional side view of each blade surface of the stirring blade shown in FIG. [Figure 6] 3 shows three views of a first stirring blade among the stirring blades shown in FIG. 2. [Figure 7] 3 shows three views of the second stirring blade of the stirring blades shown in FIG. 2. [Figure 8] 3 shows three views of the third stirring blade among the stirring blades shown in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0031] An embodiment of a fluid agitation device according to the present invention will be described in detail below with reference to the drawings. In this embodiment, the fluid to be agitated is a sherbet-like fluid containing ice particles and water, which is used for cleaning pipelines, etc. The target ice content to be achieved by agitation is approximately 80%.

[0032] FIG. 1 is a schematic cross-sectional view of a stirring device according to this embodiment. Fluid container 10 is supported by a plurality of supports 24 and has a stirring rotation unit 11 inside. Agitation rotation unit 11 has a rotation shaft 12 that extends vertically at the center of container 10. In this embodiment, stirring blades are attached in three stages (stirring blades 14, 16, 18) at predetermined intervals in the axial direction of rotation shaft 12. A driving motor (not shown) is connected to rotation shaft 12, allowing the stirring blades to rotate.

[0033] Two ice makers 28, 28 are placed on top of the fluid container 10. Ice particles made by the ice makers 28 are fed into the container 10 through ice particle inlets 26, 26 formed on the top of the container 10. The container 10 is filled with salt water of about 5% by mass, and while mixing with the ice particles fed from above, the salt water and ice particles are mixed and stirred by stirring blades 14, 16, 18 with the goal of creating a sherbet-like fluid with an ice content of 80%.

[0034] Details of ice maker 28 are omitted, but it includes, for example, a refrigeration circuit, a refrigeration drum, and an auger screw. The saltwater poured into the refrigeration drum is used to make ice in the refrigeration circuit, and the ice adhering to the inner circumferential surface of the refrigeration drum is scraped off by the auger screw and poured into a container located below. Here, while the saltwater in container 10 is being mixed and stirred, it is returned from container 10 to ice maker 28 via a return path (not shown).

[0035] The stirring blade will be described below with reference to Figs. 2 to 5. Fig. 2 is an explanatory diagram showing only the stirring blade of Fig. 1, with the rotation shaft omitted. Fig. 3 is a side view of the stirring blade shown in Fig. 2. Fig. 4 is a conceptual diagram for easy understanding of the stirring blade shown in Fig. 2, and Fig. 5 shows a cross-sectional side view of each blade surface of the stirring blade shown in Fig. 4.

[0036] Three stirring blades 14, 16, and 18 are provided at approximately equal intervals from the top to the bottom of the rotating shaft 12. Hereinafter, these stirring blades will be referred to as the first stirring blade 14, the second stirring blade 16, and the third stirring blade 18. An idler 20 for rectifying the flow is provided between the first stirring blade 14 and the second stirring blade 16. This idler 20 is provided free to rotate freely around the center of the rotating shaft 12.

[0037] The agitator blades 14, 16, and 18 at each stage are divided into partial inclined portions 32 and 33 whose blade surface inclination differs depending on the distance region from the rotation shaft 12 in the extension direction. In this embodiment, the partial inclined portion of each agitator blade is a first partial inclined portion 32 up to a predetermined distance from the rotation shaft 12, in which the blade surface is inclined in a direction that pushes the fluid downward as the agitator blade rotates, and a second partial inclined portion 33 from the first partial inclined portion 32 to the tip in the extension direction, in which the blade surface is inclined in a direction that pushes the fluid upward as the agitator blade rotates. In this embodiment, these first and second partial inclined portions 32 and 33 are set so that the inclination direction is the same for each of the agitator blades 14, 16, and 18.

[0038] That is, the blade surface 40 of the first inclined portion 32 of the first agitating blade 14 is inclined in a direction such that rotation pushes the fluid downward toward the container 10, and the blade surface 42 of the second inclined portion 33 is inclined so that rotation pushes the fluid upward toward the container 10. That is, the blade surfaces 40 and 42 that are consecutively adjacent to each other have inclinations in opposite directions.

[0039] Blade surface 44 of first inclined portion 32 of second agitator blade 16 is also angled so that rotation will push the fluid downward toward container 10, and blade surface 42 of second inclined portion 33 is angled so that rotation will push the fluid upward toward container 10. In other words, blade surface 44 and blade surface 46 are inclined in opposite directions.

[0040] Similarly, blade surface 48 of first inclined portion 32 of third agitator blade 16 is angled so that rotation will push the fluid downward toward container 10, and blade surface 50 of second inclined portion 33 is angled so that rotation will push the fluid upward toward container 10. In other words, blade surface 48 and blade surface 50 have inclinations in opposite directions to each other.

[0041] Here, the inclination angles of the blade surfaces 44 and 46 of the second agitator blade 16 are set to be larger than the inclination angles of the blade surfaces 40 and 42 of the first agitator blade 14. Furthermore, the inclination angles of the blade surfaces 48 and 50 of the third agitator blade 18 are set to be intermediate between the inclination angles of the blade surfaces 40 and 42 of the first agitator blade 14 and the inclination angles of the blade surfaces 44 and 46 of the third agitator blade 18.

[0042] In addition, in each stirring blade, there is an intermediate inclined section 30 between the first inclined section 32 and the second inclined section 33, where the inclination angle gradually changes. At this point, the inclination of the adjacent blade surfaces changes smoothly and continuously. That is, between blade surface 40 and blade surface 42, between blade surface 44 and blade surface 46, and between blade surface 48 and blade surface 50, the inclination of the adjacent blade surfaces changes smoothly.

[0043] 5 is a cross-sectional side view showing the inclination of each blade surface in this embodiment (Va-Va cross section, Vb-Vb cross section, Vc-Vc cross section, Vd-Vd cross section, Ve-Ve cross section, and Vf-Vf cross section of each blade surface). From this, it can be seen that the blade surface 40 and the blade surface 42 of the first agitator blade 14 are inclined in opposite directions, and the inclination angles are approximately the same. Similarly, the inclination angle of the blade surface 46, which is inclined in the opposite direction to the blade surface 44 of the second agitator blade 16, is approximately the same, and the inclination angle of the blade surface 50, which is inclined in the opposite direction to the blade surface 48 of the third agitator blade 18, is approximately the same.

[0044] 6, 7, and 8 show three-views (front view, plan view, and side view) of the first agitating blade 14, the second agitating blade 16, and the third agitating blade 18, respectively. However, only the direction of extension from the rotation shaft 12 is shown. That is, each figure (a) shows a plan view of each agitating blade, each figure (b) shows a front view of each agitating blade, and each figure (c) shows a side view of each agitating blade.

[0045] Due to the above-described configuration of each agitator blade 14, 16, 18, each partial inclined portion of each stage (first partial inclined portion 32, second partial inclined portion 33) moves in the rotational direction simultaneously at each depth position within the fluid container 10, and can push the fluid in different directions. Therefore, when the agitator blades 14, 16, 18 are driven to rotate, the target fluid is subjected to pushing forces in different directions from the blade surface at each of the multiple partial inclined portions present at depth and radial positions, resulting in complex mixing as a whole.

[0046] Furthermore, due to the above-mentioned inclination settings of the first inclined portion 32 and the second inclined portion 33, the fluid flows downward in the region close to the rotation axis 12 within the container 10, and flows upward in the region close to the wall of the container 10, thereby generating convection throughout the container 10.

[0047] Therefore, when a sherbet-like fluid or the like, which experiences increased resistance to stirring as the ice content increases, is to be stirred, accurate stirring is possible so that the sherbet-like fluid does not stagnate.

[0048] Furthermore, the presence of the intermediate inclined portion 30 of each agitator blade 14, 16, 18 allows the fluid to be agitated to flow more smoothly in that portion than on the other blade surfaces, thereby reducing the rotational resistance of the agitator blades 14, 16, 18 to the fluid when the agitator blades 14, 16, 18 are rotating. This configuration ensures good rotation of the agitator blades 14, 16, 18 even when the agitator blades 14, 16, 18 are rotating with a high ice content, even when the agitator blades 14, 16, 18 are a fluid with high agitation resistance, such as the sherbet-like fluid described above. Furthermore, the intermediate inclined portion 30 itself generates a torsional force on the fluid, contributing to good agitation and convection of the fluid.

[0049] Furthermore, the inclination angles of the partially inclined portions 32, 33 of the agitating blades 14, 16, 18 of each stage within the container 10 are set differently for each stage, thereby enabling good agitation and convection within the container 10. That is, when the target fluid is a sherbet-like fluid, it is assumed that there will be a large amount of ice particles floating in salt water in the upper part of the container 10 and a large amount of salt water in the lower part of the container 10. By setting the inclination of the partially inclined portions 32, 33 of the first agitating blade 14 to be small, priority is given to suppressing resistance during rotation, and by setting the inclination of the partially inclined portions 32, 33 of the second agitating blade 16 of the lower stage to be even larger, a large downward pulling force is obtained in the central region where the sherbet-like fluid is present, and by strengthening the upward pushing force near the inner wall of the container 10, accurate mixing is achieved. The third agitator blade 18, which is set at an inclination angle midway between the blade surfaces of the first agitator blade 14 and the second agitator blade 16, is adjusted to draw the water downward moderately in the central region and raise it moderately in the inner wall region, promoting convection.

[0050] Furthermore, in this embodiment, the inclination angles of the first and second inclined portions 32 and 33 of each agitating blade 14, 16, and 18 are set to the same magnitude but in opposite directions, but various modifications are possible. For example, it is also possible to set the inclination angle of the first inclined portion 32 on the rotating shaft 12 side, which exerts a downward pulling force, to be larger, and to set the inclination angle of the second inclined portion on the inner wall side of the fluid container 10, which exerts an upward pushing force, to be smaller. This makes it possible to more quickly draw the introduced fluid downward, particularly when the fluid container 10 has a fluid inlet portion located closer to the rotating shaft 12, as described above, thereby achieving rapid agitation.

[0051] Furthermore, in this embodiment, the lengths in the extension direction of the first inclined portion 32 and the second inclined portion 33 of the three stages of agitator blades 14, 16, and 18 are set to be approximately the same for each agitator blade, but it is also possible to change the lengths for each agitator blade. In other words, it is possible to make the length ratio of the extension direction length of the first inclined portion 32 to the extension direction length of the second inclined portion 33 different for each stage of agitator blade.

[0052] For example, if a large downward pressure is to be applied to the fluid in the region close to the rotation axis 12, this can be achieved by making the length of the first inclined portion 32 longer than the length of the second inclined portion 33 located on the outside. This makes it possible to achieve good stirring and convection of the fluid within the container 10.

[0053] In another embodiment of the fluid stirring device of the present invention, in the first to third stirring blades 14, 16, and 18 shown in Figure 2, the length L1 in the extension direction of the first inclined portion 32 is set to L1 = L / √2, where L is the total length of the stirring blade including the second inclined portion 33.

[0054] With this configuration, the volume of fluid pushed downward into the container 10 by the first inclined portion 32 and the volume of fluid pushed upward into the container 10 by the second inclined portion 33 are approximately equal, which eliminates strain on the fluid movement within the fluid container 10, effectively reduces stirring resistance, and more accurately realizes convection of the fluid, resulting in good stirring and further homogenization.

[0055] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, although the first to third agitating blades are shown in three stages, the present invention is not limited to this configuration and may be installed in two stages, four stages, or more, and this configuration can be appropriately determined depending on the size of the container 10 and the properties of the fluid being agitated (viscosity, mass, etc.). Furthermore, although the present invention has been described with respect to agitating blades 14, 16, and 18 having two inclined portions extending from the rotation axis, they may instead have three or more inclined portions. This configuration can also be appropriately determined depending on the viscosity, mass, etc. of the fluid being agitated.

[0056] Furthermore, for each of the agitating blades 14, 16, and 18, the length in the extension direction of the partial inclined portion, i.e., the length in the extension direction of the first partial inclined portion 32 and the second partial inclined portion 33, is set to be approximately the same for the first to third agitating blades, but as mentioned above, this is not restrictive and can be set appropriately depending on the viscosity, mass, etc. of the fluid to be agitated.

[0057] In addition, when the target fluid is a sherbet-like fluid, the ice maker 28 is placed on top of the fluid container 10, but the installation location of the ice maker 28 is not limited to that location, and the ice maker 28 may be installed in another location as long as ice particles can be accurately introduced into the container 10. [Explanation of symbols]

[0058] 10 Fluid container 11. Stirring rotor 12 Rotation axis 14 First stirring blade 16 Second stirring blade 18 Third stirring blade 20 Idler 22 Fluid outlet 24 Posts 26 Ice particle inlet 28 Ice Maker 30 Intermediate slope 32 1st part inclined part 33 Second slope part 40 Blade surface of first inclined portion of first agitating blade 42 Blade surface of second inclined portion of first agitating blade 44 Blade surface of first inclined portion of second agitating blade 46 Blade surface of second inclined portion of second agitating blade 48 Blade surface of the first inclined portion of the third agitating blade 50 Blade surface of second inclined portion of third agitating blade

Claims

1. An agitation device having a fluid container that contains a sherbet-like fluid containing salt water and ice particles, a rotating shaft that is installed in the fluid container and extends in a substantially vertical direction, and an agitation blade that is attached to the rotating shaft and agitates the fluid within the fluid container, The stirring blade is At least three stages are provided at predetermined intervals in the axial direction of the rotary shaft, The stirring blades at each stage are a blade surface having a predetermined inclination with respect to the plane of rotation over the entire length in the extension direction from the rotation axis; The blade surface is divided into partial inclined portions each having a different inclination state depending on the distance region in the extension direction, Furthermore, the blade surfaces are set such that the inclination directions of adjacent partial inclined portions with respect to the rotation surface are opposite to each other, The partial inclination portion of the stirring blade of each stage is a first inclined portion inclined in a direction in which the blade surface pushes the fluid downward by rotation of the stirring blade up to a predetermined distance from the rotation shaft, and a second inclined portion inclined in a direction in which the blade surface pushes the fluid upward by rotation of the stirring blade from the first inclined portion to a tip side; A fluid agitator, characterized in that the first inclined portion and / or the second inclined portion of the agitating blades in adjacent upper and lower stages have different inclination angles.

2. A fluid stirring device as described in Claim 1, characterized in that the first and second inclined portions of the topmost stage are each set to have a smaller inclination angle than the first and second inclined portions of the stages below them.

3. A fluid stirring device as described in Claim 2, characterized in that the first and second inclined portions of the lowest stirring blade are set to have smaller inclination angles than the first and second inclined portions of the second stirring blade from the bottom.

4. A fluid agitator according to any one of claims 1 to 3, characterized in that intermediate inclined sections in which the inclination angle gradually changes are provided between partial inclined sections of different inclination of the agitator blade.

5. A fluid stirring device described in any one of claims 1 to 4, characterized in that the length in the extension direction of the partially inclined portions existing at each stage and at each distance from the rotation axis is separately and arbitrarily set.

6. A fluid stirring device described in any one of claims 1 to 5, characterized in that the extension direction length L1 of the first inclined portion is L1 = L / √2, where L is the total length of the stirring blade.

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