A flow guide for stirring and a magnetic suspension stirring device

Abstract

The present application relates to a kind of for stirring flow guide and magnetic suspension stirring device, flow guide includes annular carrier plate and at least one flow guide vane, the hollow portion of annular carrier plate is configured to accommodate for stirring impeller, at least one flow guide vane is radially arranged in the periphery of impeller, at least one flow guide vane is configured to change the direction of fluid rotated by impeller, to partially or completely eliminate the circumferential flow portion of fluid rotated by impeller.By the flow guiding effect of flow guide, the present application can weaken or eliminate the circumferential flow portion of fluid rotated by impeller, so that fluid flows along radial or axial, to achieve the purpose of improving or eliminating vortex.The magnetic suspension stirring device of the present application can significantly improve mixing effect, improve stirring efficiency, avoid vortex to affect impeller, avoid cavitation and damage medium due to vortex, can better meet the needs of biopharmaceutical, semiconductor and chip manufacturing under clean environment stirring mixing.

Description

Technical Field

[0001] This invention relates to the field of mixing and stirring technology, and in particular to a flow guide and a magnetic levitation stirrer for stirring. Background Technology

[0002] Mixing and agitation technology is widely used in industries such as chemicals, petroleum, metallurgy, food, materials, and waste treatment. It utilizes impellers within a mixer to fuse and disperse different substances, creating a homogeneous system with similar compositions, such as mixing liquids with liquids or solids / powders with liquids. Traditional mixing systems typically include a mixer mechanically connected to a drive shaft. This mixer extends into the fluid within the container through an opening at the top and is then driven to rotate by an external motor. In this type of mixing system, the mixer's drive shaft is connected to the external motor via a sealed structure. Due to the potential for contamination and leakage of the fluid within the container, this type of mixer is generally unsuitable for use in biopharmaceutical, semiconductor, and chip manufacturing industries, or in bioreactors.

[0003] Magnetic coupling between the stirrer inside the container and the drive unit outside the container eliminates contamination problems, enabling a completely closed system and preventing leaks. Therefore, magnetic levitation stirring devices have a natural advantage in the biopharmaceutical, semiconductor, and chip manufacturing fields because they eliminate the need for a drive shaft to pass through the container wall to rotate the stirrer, thus eliminating the need for a sealing structure between the drive shaft and the container. Magnetic levitation stirring devices typically consist of a magnetic rotary actuator located outside the container and a magnetically levitated stirrer located inside the container. The magnetic stirrer, also known as an impeller, mainly consists of a rotor with a magnetic body and multiple stirring blades for agitation. The magnetic rotary actuator, also known as a magnetic levitation motor or bearingless motor, generates rotational torque and levitation force, which are transmitted to the rotor of the impeller through magnetic coupling, thereby driving the impeller to levitate and rotate, thus stirring the substances inside the container to achieve mixing or dispersion.

[0004] Magnetic levitation stirring devices are typically located at the bottom of the container. When the fluid viscosity is low and the stirrer speed is high, a vortex effect is easily generated. The vortex effect is produced by the interaction of centrifugal force with the rotating fluid. The generation of the vortex effect presents the following technical challenges:

[0005] The presence of vortices prevents the impeller speed from being effectively increased, and the impeller speed directly affects the mixing efficiency, leading to a decrease in mixing efficiency. When vortices exist or are large, the circumferential flow effect of the fluid circulation is amplified, affecting the circulation rates of the radial and axial flows, resulting in uneven mixing and severely impacting the mixing effect. 2) As the mixing speed increases, vortices may reach the impeller. Since the impeller is in a suspended state, the vortices will affect the impeller's balance or stability. Furthermore, when vortices reach the impeller, the air near the impeller is broken up, generating bubbles that enter the medium. The medium's density decreases after mixing with the gas, leading to cavitation and damage to the medium. To avoid generating vortices during the production process, multiple baffles are usually installed inside the container to eliminate vortices. However, installing baffles inside the container is complex and expensive, especially in environments with very high cleanliness requirements, such as biopharmaceuticals, semiconductors, and chip manufacturing, where cleaning and maintenance of the baffles are extremely difficult and costly. On the other hand, baffles are usually installed on the side wall of the container to change the circumferential flow into radial and axial flow. The flow obstruction method of the baffles results in greater power loss of the fluid. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a flow guide and a magnetic levitation stirring device for stirring, which achieves the purpose of improving or eliminating vortices with low power loss.

[0007] According to one aspect of the present invention, a flow guide for stirring is provided, the flow guide comprising an annular carrier plate and at least one flow guide blade disposed on the annular carrier plate, the hollow portion of the annular carrier plate being configured to accommodate an impeller for stirring, the at least one flow guide blade being radially arranged around the impeller, the at least one flow guide blade being configured to change the direction of the fluid discharged by the impeller during rotation, so as to partially or completely eliminate the circumferential flow portion of the fluid discharged by the impeller during rotation.

[0008] According to another aspect of the present invention, a magnetic levitation stirring device is provided, comprising a container and an impeller with a magnetic body disposed within the container, and further comprising the aforementioned flow guide for stirring, wherein an annular carrier plate and at least one flow guide blade of the flow guide are disposed around the impeller.

[0009] Compared with the prior art, the above-mentioned technical solution of the present invention has the following advantages: Since the fluid discharged from the impeller has a velocity component (circumferential flow) in the same direction as the impeller's rotation, this velocity component is the main cause of the stirring vortex. The flow guide of the present invention guides the fluid discharged from the impeller in the radial direction or opposite to the impeller's rotation direction through radially arranged guide blades, thereby changing the circumferential flow of the fluid discharged from the impeller. That is, through the guiding effect of the guide blades, the circumferential flow portion of the fluid discharged from the impeller can be weakened or eliminated, causing the fluid to flow only radially or axially, or mostly radially or axially, thereby improving or eliminating vortices. Furthermore, the flow guide of the present invention, based on the direct flow guidance of the guide blades to change the circumferential flow of the fluid, has the advantage of lower power loss compared to the baffle obstruction scheme in the prior art. Moreover, the flow guide is centrally located around the impeller, which, compared to the dispersed baffle scheme, has the advantages of lower material cost, easier cleaning and maintenance, and better vortex elimination effect. This invention relates to a magnetic levitation stirring device. By setting a guide vane around the impeller, the guiding effect of at least one guide vane of the guide vane is directly applied to the fluid discharged from the impeller. By using radial guidance, reverse guidance, and changing the direction of guidance to slow down or eliminate the circumferential flow of the fluid caused by the rotational angular momentum of the impeller, the mixing effect can be significantly improved, the stirring efficiency can be increased, the influence of vortices on the impeller can be avoided, the stable operation of the impeller can be guaranteed, and cavitation and media damage caused by vortices can also be avoided. It can better meet the stirring and mixing needs in clean environments such as biopharmaceutical, semiconductor and chip manufacturing. Attached Figure Description

[0010] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0011] Figure 1 This is a perspective view of Embodiment 1 of the flow guide for stirring according to the present invention;

[0012] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the flow guide for stirring according to the present invention;

[0013] Figure 3 for Figure 2 Cross-sectional view along the AA direction;

[0014] Figure 4 This is a schematic diagram of the structure of the flow guide for stirring according to the present invention in conjunction with the impeller in Embodiment 1;

[0015] Figure 5 for Figure 4 Cross-sectional view along the middle BB direction;

[0016] Figure 6This is a schematic diagram of the structure of Embodiment 2 of the flow guide for stirring according to the present invention;

[0017] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the flow guide for stirring according to the present invention;

[0018] Figure 8 This is a schematic diagram of the structure of Embodiment 4 of the flow guide for stirring according to the present invention;

[0019] Figure 9 This is a schematic diagram of the structure of Embodiment 5 of the flow guide for stirring according to the present invention;

[0020] Figure 10 This is a schematic diagram of the structure of Embodiment 6 of the flow guide for stirring according to the present invention;

[0021] Figure 11 This is a schematic diagram of the structure of Embodiment 7 of the flow guide for stirring according to the present invention;

[0022] Figure 12 This is a schematic diagram of the structure of Embodiment 8 of the flow guide for stirring according to the present invention;

[0023] Figure 13 This is a schematic diagram of the structure of Embodiment 9 of the flow guide for stirring according to the present invention;

[0024] Figure 14 This is a schematic diagram of the structure of Embodiment 10 of the flow guide for stirring according to the present invention;

[0025] Figure 15 This is a schematic diagram of the structure of Embodiment 11 of the flow guide for stirring according to the present invention;

[0026] Figure 16 This is a schematic diagram of the structure of Embodiment 12 of the flow guide for stirring according to the present invention;

[0027] Figure 17 This is a schematic diagram of the structure of the first embodiment of the magnetic levitation stirring device of the present invention;

[0028] Figure 18 This is a schematic diagram of the second embodiment of the magnetic levitation stirring device of the present invention (impeller omitted);

[0029] Figure 19 This is a structural schematic diagram of the third embodiment of the magnetic levitation stirring device of the present invention. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "comprising" and "equipped with," and any variations thereof, in the specification, claims, and the aforementioned drawings of this invention are intended to cover non-exclusive inclusion. For example, a system, product, or device that includes a series of units is not necessarily limited to those units explicitly listed, but may include other units not explicitly listed or inherent to such products or devices.

[0032] In existing technologies, magnetic stirring devices or magnetic levitation stirring devices are typically located at the bottom of the container. When the fluid viscosity is low and the stirrer speed is high, a vortex effect is easily generated. The vortex effect is produced by the interaction of centrifugal force with the rotating fluid. The generation of the vortex effect leads to a decrease in stirring efficiency, uneven mixing, and seriously affects the stirring effect. Furthermore, the vortex effect can also affect the balance or stability of the impeller, leading to cavitation and media damage.

[0033] To prevent vortices from forming in production processes using magnetic stirring or magnetic levitation stirring devices, the traditional method is to install multiple baffles inside the container. However, installing baffles inside the container is complex and expensive, especially in environments with extremely high cleanliness requirements such as biopharmaceuticals, semiconductors, and chip manufacturing, where cleaning and maintenance of the baffles are very difficult and costly. Furthermore, baffles are typically installed on the side walls of the container, changing the circumferential flow into radial or axial flow; the flow obstruction caused by the baffles results in significant power loss of the fluid.

[0034] To address the aforementioned technical problems, this invention proposes a flow guide for stirring, achieving the goal of improving or eliminating vortices with low power loss. The flow guide includes an annular carrier plate and at least one guide vane disposed on the annular carrier plate. The hollow portion of the annular carrier plate is configured to accommodate an impeller for stirring. The at least one guide vane is radially arranged around the impeller, and is configured to change the direction of the fluid discharged from the rotating impeller, thereby partially or completely eliminating the circumferential flow portion of the fluid discharged from the rotating impeller. Compared to the flow-obstructing baffle solutions in the prior art, the flow guide of this invention, based on the flow-guiding effect of the guide vanes to change the circumferential flow of the fluid, has the advantage of lower power loss. Furthermore, the flow guide is centrally located around the impeller, which, compared to the dispersed baffle solution, offers advantages such as lower material costs, easier cleaning and maintenance, and better vortex elimination effect. This invention also proposes a magnetic levitation stirring device. Based on the anti-vortex advantage of the flow guide of this invention, it can improve the mixing effect, increase the stirring efficiency, avoid the influence of vortices on the impeller, ensure the stable operation of the impeller, and also avoid cavitation and media damage caused by vortices. It can better meet the stirring and mixing needs in clean environments such as biopharmaceutical, semiconductor and chip manufacturing.

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, wherein, Figure 1 This is a perspective view of Embodiment 1 of the flow guide for stirring according to the present invention; Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the flow guide for stirring according to the present invention; Figure 3 for Figure 2 Cross-sectional view along the AA direction; Figure 4 This is a schematic diagram of the structure of the flow guide for stirring according to the present invention in conjunction with the impeller in Embodiment 1; Figure 5 for Figure 4 Cross-sectional view along the middle BB direction; Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the flow guide for stirring according to the present invention;

[0036] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the flow guide for stirring according to the present invention; Figure 8 This is a schematic diagram of the structure of Embodiment 4 of the flow guide for stirring according to the present invention; Figure 9 This is a schematic diagram of the structure of Embodiment 5 of the flow guide for stirring according to the present invention; Figure 10 This is a schematic diagram of the structure of Embodiment 6 of the flow guide for stirring according to the present invention; Figure 11 This is a schematic diagram of the structure of Embodiment 7 of the flow guide for stirring according to the present invention;

[0037] Figure 12 This is a schematic diagram of the structure of Embodiment 8 of the flow guide for stirring according to the present invention; Figure 13 This is a schematic diagram of the structure of Embodiment 9 of the flow guide for stirring according to the present invention; Figure 14 This is a schematic diagram of the structure of Embodiment 10 of the flow guide for stirring according to the present invention; Figure 15 This is a schematic diagram of the structure of Embodiment 11 of the flow guide for stirring according to the present invention; Figure 16 This is a schematic diagram of the structure of Embodiment 12 of the flow guide for stirring according to the present invention; Figure 17 This is a schematic diagram of the structure of the first embodiment of the magnetic levitation stirring device of the present invention; Figure 18 This is a schematic diagram of the second embodiment of the magnetic levitation stirring device of the present invention (impeller omitted); Figure 19 This is a structural schematic diagram of the third embodiment of the magnetic levitation stirring device of the present invention.

[0038] Example 1

[0039] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This embodiment of a flow guide for stirring includes an annular carrier plate 11 and at least one flow guide blade 12. In this embodiment, the at least one flow guide blade is configured for radial flow guidance, which guides the fluid discharged by the rotating impeller along the radial direction of the impeller.

[0040] The annular carrier plate 11 serves as the main support, which supports and fixes the guide vanes 12. The annular carrier plate 11 can be used to connect with the container. The form of the container is not limited. For example, it can be a rigid container, such as a mixer, reactor or reaction vessel, or a flexible container, such as a disposable mixing bag.

[0041] The shape of the annular carrier plate 11 is not limited. Since the guide vane of the present invention is used to solve the vortex problem of stirring, and the stirring adopts an impeller with stirring blades that rotates in a circle, a hollow part 111 is provided in the middle of the annular carrier plate 11. The hollow part 111 is configured to accommodate the impeller 2 used for stirring. The hollow part 111 is preferably a circular through hole to accommodate the stirring blades arranged in a circle on the impeller 2. Preferably, the annular carrier plate 11 is circular in shape. The circular shape can meet the bearing requirements of the guide vanes 12 arranged in a circle, but it is not limited to this. The annular carrier plate 11 can also be other shapes, such as square annular, elliptical annular, etc.

[0042] The thickness of the annular carrier plate is not limited. As a preferred embodiment, the annular carrier plate is flat and disc-shaped, but it is not limited to this. The annular carrier plate can also be other three-dimensional structures, as long as a bearing surface that can support the guide vanes is configured on it. In this embodiment, see [reference needed]. Figure 1 and Figure 2A bearing surface is provided on one side of the annular carrier plate 11, and the bearing surface is flat, which can meet the flow guidance requirements of the impeller being located at the bottom of the container. In other embodiments, such as with a stirrer with a double impeller structure, bearing surfaces can also be provided on both opposite sides of the annular carrier plate, that is, at least one of the opposite sides of the annular carrier plate 11 is a bearing surface, and the guide vanes 12 are provided on the corresponding bearing surfaces.

[0043] The material of the annular carrier plate is not limited. In some metal containers, the annular carrier plate can be made of metal to facilitate welding to the bottom of the metal container. However, it is not limited to this. In other embodiments, the annular carrier plate can also be made of plastic, rubber or other materials. For example, when applied to disposable flexible mixing bags, the annular carrier plate can be made of plastic in order to facilitate fusion and sealing with the flexible mixing bag made of plastic.

[0044] Among them, see Figure 1 and Figure 2 At least one guide vane 12 is disposed on the annular carrier plate 11 and arranged radially around the impeller to change the circumferential flow direction of the fluid discharged from the centrifugal impeller. To clearly characterize the technical features of the present invention, the radial direction of the impeller is defined as the first direction U. Radial guidance can be achieved either by the guide vane being disposed along the first direction or by the fluid's discharge direction after passing through the guide vane being along the first direction. In this embodiment, the fluid's discharge direction after passing through the guide vane is along the first direction, meaning the end of the guide vane furthest from the impeller approaches the first direction U. In this embodiment, under the guiding action of the guide vane 12, the fluid L discharged from the impeller 2 flows out along the first direction U after being guided by at least one guide vane 12. Since the fluid L discharged by impeller 2 includes a velocity component in the same direction as the impeller's rotation (circumferential flow) and a velocity component in the same direction as the impeller's radial direction, and this circumferential flow velocity component is the main cause of the stirring vortex, in this embodiment, the guide vane 12 is configured to guide the fluid L in the first direction U, that is, to guide the flow along the radial direction of the impeller, which can achieve the function of changing the circumferential flow of the fluid L discharged by impeller 2. In this way, under the guiding action of the guide vane 12 of the guide vane 1, by weakening or eliminating the circumferential flow portion of the fluid discharged by the impeller, the fluid flows only radially or axially, or mostly radially or axially, which can achieve the purpose of improving or eliminating vortices.

[0045] The connection method between at least one guide vane and the annular carrier plate is not limited. Where process conditions permit, at least one guide vane can be fixed to the annular carrier plate by welding, bonding, snap-fitting, locking, or other methods. Preferably, at least one guide vane and the annular carrier plate are integrally molded components. That is, the entire flow guide is a single component, and at least one guide vane and the annular carrier plate are both parts of this component. For example, when the flow guide is made of plastic, the annular carrier plate and at least one guide vane can be integrally molded using injection molding. Integral-molded flow guides have advantages such as good robustness and low manufacturing cost.

[0046] The number of guide vanes is not limited; at least one guide vane can be one or more, and the appropriate number can be selected based on the impeller shape and the characteristics of the discharged fluid. Since the guiding effect of a single guide vane is limited and it cannot be symmetrically arranged in the circumferential direction, two or more guide vanes are usually provided to achieve better guiding effect. This embodiment illustrates 14 guide vanes, which are evenly spaced along the circumference of the impeller. They can also be spaced out but unevenly distributed, but are not limited to this arrangement.

[0047] The distance between the guide vanes and the impeller is not limited. Since the guide vanes are radially shaped, preferably, one end of the guide vane is positioned close to the impeller and at a first distance from the outer diameter of the impeller, while the opposite end is positioned away from the impeller. This first distance prevents the impeller from colliding with the guide vanes due to vibration during operation. Here, one end of the guide vane is its inner diameter, and the other end is its outer diameter. A first distance should be set between the inner diameter of the guide vane and the tip of the impeller. In the case where the impeller is driven by a magnetic levitation motor, preferably, the first distance is not less than 2mm. A larger distance between the inner diameter of the guide vane and the tip of the impeller is not necessarily better; therefore, preferably, a compromise is sought between the guiding effect and the distance between the two.

[0048] The height of the guide vanes along the impeller axis is not limited. Preferably, the height of the end of the guide vane closest to the impeller along the impeller axis is not less than the height of the outer diameter of the impeller's stirring blades and not more than twice the height of the outer diameter of the impeller's stirring blades. If this height is too small, the guiding effect will be poor; if it is too large, the fluid blockage will be too great, the power consumption will be high, and the radial flow circulation speed will be weakened.

[0049] Specifically, the height of the end of the guide vane furthest from the impeller along the impeller's axis should not exceed twice the height of the tip of the impeller's stirring blades. Similarly, if this height is too small, the guiding effect will be poor; if it is too large, fluid blockage will be excessive, power consumption will be high, and the radial flow circulation speed will be weakened.

[0050] The guide vanes can be at a constant height or vary along the impeller's axis. Preferably, from the end closest to the impeller to the end furthest from the impeller, the height of the guide vanes along the impeller's axis is the same, gradually increasing, or gradually decreasing. See also Figure 1 and Figure 3 In this embodiment, the height of the guide vanes along the impeller's axis gradually decreases from the end closest to the impeller to the end furthest from the impeller. Setting the guide vanes to be higher on the inside and lower on the outside better matches the top-to-bottom flow characteristics of fluid, resulting in better flow guidance for the same stirring blade area.

[0051] The guide vane is generally sheet-shaped, with two opposing extended surfaces for guiding the flow. These opposing surfaces can be planar or curved, and can be of equal or unequal thickness. At least one of the opposing surfaces has a guiding function. Based on the impeller's preset rotation direction, the guide vane guides the fluid discharged from the impeller's stirring blades in a directional manner. In this case, one of the opposing surfaces of the guide vane provides better guidance than the other. (See [reference needed]). Figure 1 , Figure 2 and Figure 4 In this embodiment, the preset rotation direction of the impeller 2 is clockwise, such as... Figure 2 As shown by arrow s, conversely, when the flow guiding effect is slightly inferior, the impeller 2 can also rotate counterclockwise, as shown by arrow N in the figure. The guide vane 12 is used to guide the fluid L discharged from the impeller 2 in the first direction U. The guide vane 12 is a blade of uniform thickness, and its two opposite surfaces are both flow guiding arc surfaces. The flow guiding arc surface closer to the impeller deflects away from the impeller's preset rotation direction by a first angle θ1, while the flow guiding arc surface farther from the impeller approaches the first direction U, as shown by arrow s. Figure 2As shown, the first direction U is tangent to the end of the guide vane away from the impeller, and the end of the guide vane near the impeller is deflected in the opposite direction of the impeller's preset rotation by a first angle θ1. That is, one end of the guide arc surface approaches the first direction U, and the other end of the guide arc surface is deflected in the opposite direction of the impeller's preset rotation by a first angle θ1. Thus, when the impeller 2 rotates clockwise along arrow S, the direction of the fluid L discharged from the impeller 2 coincides with the direction of the guide arc surface (concave surface) deflected by the first angle θ1. After being discharged, the fluid L flows along the guide vane 12 and is continuously guided by the guide arc surface before flowing out from the first direction U (radial guidance), that is, flowing out of the guide vane 1 radially along the impeller 2. Similarly, when impeller 2 rotates counterclockwise along arrow N, the direction of the fluid L discharged from impeller 2 interferes with the guide arc surface (convex surface) deflected by the first angle θ1. After being discharged, the fluid interferes with the convex surface and flows along the guide blade 12. After being continuously guided by the guide arc surface, it flows out from the first direction U, that is, it flows out of the guide tube 1 radially along impeller 2. Since the blades are of uniform thickness, the concave guide arc surface has a better guiding effect than the convex guide arc surface. At this time, the guide tube does not limit the rotation direction of the impeller, and the impeller form can be freely selected. If the impeller rotation direction is given, for example, due to the need for stirring, the impeller only rotates in the preset rotation direction, then a guide tube with a better guiding effect can be selected to be used with it. That is, one side of the guide blade with a concave surface is selected as the guide arc surface, while the other side does not have to be a guide arc surface. In this way, even when the impeller rotates counterclockwise along arrow N, the fluid discharged from the impeller will not interfere with the guide blade. The selection of the first angle θ1 is determined by the direction of the fluid L discharged from the impeller 2, so as to improve or eliminate vortices while minimizing power loss.

[0052] The angle between the plane or curved surface (e.g., an arc surface) of the guide vane and the bearing surface of the annular carrier plate is not limited. In this embodiment, the guide vane is perpendicular to or nearly perpendicular to the bearing surface of the annular carrier plate. This perpendicularity or near-perpendicularity of the guide vane to the bearing surface of the annular carrier plate is mainly applied to radial flow impellers, i.e., the impeller's stirring blades are radial flow stirring blades; for example, the stirring blades are perpendicular to the radial plane of the impeller rotor. See also... Figure 4 and Figure 5 The impeller 2 has arc-shaped stirring blades 23, which are perpendicular to or nearly perpendicular to the rotor 22. The annular carrier plate 11 and at least one guide blade 12 of the guide vane 1 are disposed around the impeller 2. Specifically, the annular carrier plate 11 and at least one guide blade 12 of the guide vane 1 are disposed around the stirring blades 23 of the impeller 2. The magnetic body 21 is embedded inside the rotor 22. This invention does not limit the form of the impeller 2; this embodiment only illustrates one form of the impeller, but is not limited thereto.

[0053] Figures 6 to 16These are variations of other embodiments of the present invention. In these figures, features that are the same as or similar to those in Embodiment 1 described above are used, and therefore, they have the same reference numerals as in Embodiment 1.

[0054] Example 2

[0055] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the flow guide for stirring according to the present invention; in this embodiment, at least one flow guide blade is configured for radial flow guidance, and radial flow guidance is to guide the fluid discharged by the impeller rotation along the radial direction of the impeller.

[0056] like Figure 6 As shown, the guide vane 1 in this embodiment has the same or similar features as the above embodiment 1. The difference is that in this embodiment, the guide vane 12 is a blade of unequal thickness. The guide vane 12 includes a guide section 121 close to the impeller 2 and a guide section 122 away from the impeller 2. At least one of the two opposite sides of the guide section 121 is a guide arc surface, and at least one of the two opposite sides of the guide section 122 is a guide straight plane. The guide arc surface of the guide section 121 is transitionally connected to the guide straight plane of the corresponding guide section 122. The guide arc surface close to the impeller 2 is deflected by a second angle θ2 away from the preset rotation direction of the impeller, and the guide straight plane away from the impeller 2 is set along the first direction U. Compared to Embodiment 1, in this embodiment, the guide vane 12 includes two sections: a flow-guiding section 121 and a flow-guiding section 122. The flow-guiding section 121 is located close to the impeller 2. Similar to Embodiment 1, at least one of the opposite sides of the flow-guiding section 121 is a flow-guiding arc-shaped surface, meaning that both opposite sides of the flow-guiding section can serve as flow-guiding surfaces, or only one side can serve as flow-guiding surfaces. When both sides can serve as flow-guiding surfaces, the guide vane 1 does not limit the rotation direction of the impeller 2, and the impeller form can be freely selected. If, given the impeller rotation direction, for example, due to the need for stirring, the impeller only rotates in a preset rotation direction, then a guide vane with better flow-guiding effect can be selected to be used in conjunction with it. That is, one side of the guide vane with a concave surface is selected as the flow-guiding arc-shaped surface, while the opposite side does not have to be a flow-guiding arc-shaped surface. In this way, even if the impeller rotates counterclockwise along arrow N, the fluid discharged by the impeller will not interfere with the guide vane. The selection of the second angle θ2 is determined by the direction of the fluid L discharged from the impeller, aiming to improve or eliminate vortices while minimizing power loss. It is particularly noteworthy that in this embodiment, the guide section of the guide has a guide plane of a preset length. By radially setting the guide plane to continue guiding the flow for a certain distance, a better guiding effect can be achieved when the diameters of the container and impeller are relatively large.

[0057] Example 3

[0058] Figure 7This is a schematic diagram of the structure of Embodiment 3 of the flow guide for stirring according to the present invention; in this embodiment, at least one flow guide blade is configured for radial flow guidance, and radial flow guidance is to guide the fluid discharged by the impeller rotation along the radial direction of the impeller.

[0059] like Figure 7 As shown, the guide vane in this embodiment has the same or similar features as that in Embodiment 1. The difference is that in this embodiment, the guide vane 12 is a blade of unequal thickness, and at least one of the two opposite sides of the guide vane 12 is a straight guiding plane along the first direction U. Compared with Embodiment 1, in this embodiment, the end of the guide vane 12 near the impeller 2 and the end away from the impeller 2 are both arranged radially along the impeller 2. The straight guiding plane near the impeller is not directly related to the preset rotation direction of the impeller; it is only necessary to ensure that the fluid L discharged from the impeller can interfere with the guide vane 12. Since the straight guiding plane of the guide vane 12 is arranged along the first direction U, i.e., the radial direction of the impeller, the fluid L will change the circumferential flow direction after passing through the guide vane 12, thereby achieving the purpose of improving or eliminating vortices. Compared with Embodiment 1, since there is no flow guidance at the end near the impeller, the relative power loss will be slightly higher. In this embodiment, at least one of the two opposing surfaces of the guide vane 12 is a straight guiding plane along the first direction U. That is, both opposing surfaces of the guide vane 12 can play a guiding role, or only one surface can play a guiding role. When both surfaces can guide, the guide vane 1 does not limit the rotation direction of the impeller and the impeller form can be freely selected. If the impeller rotation direction is given, for example, due to the need for stirring, the impeller only rotates in a preset rotation direction, then a guide vane with a straight guiding plane on one side can be selected and used in conjunction with it. That is, one side of the guide vane is set as a straight guiding plane, while the opposite side can be of other structural form. In this way, when the impeller rotates counterclockwise along arrow N, the fluid discharged by the impeller does not interfere with the guide vane.

[0060] Example 4

[0061] Figure 8 This is a schematic diagram of the structure of Embodiment 4 of the flow guide for stirring according to the present invention; in this embodiment, at least one flow guide blade is configured for radial flow guidance, and radial flow guidance is to guide the fluid discharged by the impeller rotation along the radial direction of the impeller.

[0062] like Figure 8 As shown, the guide vane in this embodiment has the same or similar features as that in Embodiment 1 above. The difference is that in this embodiment, the guide vane 12 is a blade of unequal thickness. The thickness of the guide vane 12 gradually increases from the end near the impeller to the end away from the impeller. One side of the guide vane 12 is a guide arc surface. The guide arc surface near the impeller is deflected away from the preset rotation direction of the impeller by a third angle θ3, and the guide arc surface away from the impeller approaches the first direction U. Figure 8As shown, in this embodiment, since the guide vane is a blade of unequal thickness, unlike in Embodiment 1 where the first direction U is tangent to the end of the guide vane away from the impeller, in this embodiment, the first direction U is tangent to the end of the guide arc surface of the guide vane away from the impeller. Thus, this end of the guide arc surface approaches the first direction U, while the other end of the guide arc surface deflects away from the preset rotation direction of the impeller by a first angle θ1. Compared to Embodiment 1, in this embodiment, the guide vane 12 is a blade of unequal thickness, and one side of the guide vane 12 is a guide arc surface. In this case, the preset rotation direction of the impeller and the guide vane 12 are strictly limited. The guide vane 12 can only achieve a guiding effect when the impeller 2 rotates along the preset rotation direction. That is, the concave side of the guide vane 12 is selected as the guide arc surface, while the opposite side may not be a guide arc surface. Thus, when the impeller rotates counterclockwise, the fluid L discharged by the impeller will not be guided. The selection of the third angle θ3 is determined by the direction of the fluid discharged from the impeller, aiming to improve or eliminate vortices while minimizing power loss. It is particularly noteworthy that in this embodiment, the thickness of the guide vanes gradually increases from the end closer to the impeller to the end farther away. This design aims to reduce the difference between the inlet and outlet distances between adjacent guide vanes. Compared to Embodiment 1, the difference between the inlet and outlet distances between adjacent guide vanes is reduced in this embodiment, which is beneficial for applications where the inlet and outlet flow rates do not change significantly.

[0063] Example 5

[0064] Figure 9 This is a schematic diagram of the structure of Embodiment 5 of the flow guide for stirring according to the present invention; as shown. Figure 9 As shown, the guide vane in this embodiment has the same or similar features as that in Embodiment 1 above. The difference is that in this embodiment, at least one guide vane is configured as a reverse guide, which guides the fluid discharged from the impeller in a direction opposite to the direction of impeller rotation. The guide vane 12 is a blade of uniform thickness. The fluid L discharged from the impeller 2 flows out in a direction opposite to the direction of impeller rotation after passing through the guide vane 12. The end of the guide arc surface near the impeller is deflected by a fourth angle θ4 away from the preset rotation direction of the impeller, and the end of the guide arc surface away from the impeller is deflected by a fifth angle θ5 away from the preset rotation direction of the impeller. The direction of the fluid discharged from the guide arc surface is as follows: Figure 9The second direction V is shown in the diagram. Thus, both ends of the guide arc surface deflect away from the preset deflection direction, but the deflection angles may differ. In this embodiment, compared to embodiment 1, the end of the guide arc surface away from the impeller approaches the second direction V. Therefore, the fluid L flowing out after being guided by the guide blades 12 of the guide vane 1 rotates in the opposite direction to the impeller 2, giving the fluid an angular momentum rotating in the opposite direction (reverse flow guidance). This angular momentum cancels out the angular momentum along the impeller's rotation direction, thereby achieving the purpose of eliminating vortices. Since the guide blades 12 in this embodiment have a larger curvature than the guide blades in embodiment 1, it is not advantageous to provide guide arc surfaces on both sides of the guide blades. As a preferred embodiment, in this embodiment, one side of the guide blade 12 is a guide arc surface. In this case, the preset rotation direction of the impeller 2 is strictly limited to the guide blades 12; the guide blades can only achieve the guiding effect when the impeller rotates along the preset rotation direction. That is, one side of the guide vane with a concave surface is selected as the guide arc surface, while the opposite side may not be a guide arc surface. This way, when the impeller rotates counterclockwise, the fluid discharged from the impeller will not be guided. The fourth angle θ4 is selected based on the direction of the fluid discharged from the impeller, aiming to improve or eliminate vortices while minimizing power loss. The fifth angle θ5 is selected based on the magnitude of the angular momentum of the impeller rotation to be eliminated; preferably, the fifth angle is less than or equal to 60 degrees. A fifth angle that is too small will have a similar vortex-eliminating effect as the radial guidance effect in Example 1; a fifth angle that is too large will adversely affect the radial or axial flow of the fluid discharged from the impeller, thereby weakening the stirring effect.

[0065] Example 6

[0066] Figure 10 This is a schematic diagram of the structure of Embodiment 6 of the flow guide for stirring according to the present invention; in this embodiment, at least one flow guide blade is configured to guide the flow in the opposite direction to the direction of impeller rotation, which guides the fluid discharged by the impeller rotation in the opposite direction to the direction of impeller rotation.

[0067] like Figure 10 As shown, the guide vane in this embodiment has the same or similar features as that in embodiment 5 above. The difference is that in this embodiment, the guide vane 12 is a blade of uniform thickness, and one side of the guide vane 12 is a guide bending surface. The guide bending surface includes multiple guide sub-segments 123 that are connected in sequence and bent into an arc shape. The guide sub-segments 123 closer to the impeller 2 are deflected at a sixth angle θ6 away from the preset rotation direction of the impeller, and the guide sub-segments farther from the impeller are deflected at a fifth angle θ7 away from the preset rotation direction of the impeller. The direction of the fluid discharged from the guide bending surface is as follows: Figure 10As shown in the second direction V; compared with embodiment 5, in this embodiment, the guiding bending surface of the guide vane 12 includes multiple sequentially connected guiding sub-segments 123, each of which is arc-shaped, thus achieving a guiding effect similar to that of embodiment 5. Its technical principle is the same as that of embodiment 5, that is, the rotation direction of the fluid L flowing out after being guided by the guiding bending surface of the guide vane 12 is opposite to the rotation direction of the impeller 2, giving the fluid L an angular momentum rotating in the opposite direction. This angular momentum cancels out the angular momentum along the impeller's rotation direction, thereby achieving the purpose of eliminating vortices. Since the guide vane 12 in this embodiment has a bending point compared to the guide vane 12 in embodiment 5, the guiding effect of this embodiment will be less than that of embodiment 5. Similarly, in this embodiment, the preset rotation direction of the impeller and the guide vane 12 are strictly limited; the guide vane 12 can only achieve a guiding effect when the impeller 2 rotates along the preset rotation direction. The concave side of the guide vane is selected as the guide bending surface. This way, when the impeller rotates counterclockwise, the fluid discharged from the impeller will not be guided. The sixth angle θ6 is selected based on the direction of the fluid discharged from the impeller, aiming to improve or eliminate vortices while minimizing power loss. Similarly, in this embodiment, the seventh angle θ7 is selected based on the magnitude of the angular momentum needed to eliminate the impeller's rotation; preferably, the seventh angle θ7 is less than or equal to 60 degrees. A seventh angle that is too small will have a similar vortex-eliminating effect as the radial guidance effect in Embodiment 1; a seventh angle that is too large will adversely affect the radial or axial flow of the fluid discharged from the impeller, thus weakening the stirring effect. In this embodiment, the seventh angle θ7 can be the same as or different from the fifth angle θ5 in Embodiment 5.

[0068] Example 7

[0069] Figure 11 This is a schematic diagram of the structure of Embodiment 7 of the flow guide for stirring according to the present invention; in this embodiment, at least one flow guide blade is configured to guide the flow in the opposite direction to the direction of impeller rotation, which guides the fluid discharged by the impeller rotation in the opposite direction to the direction of impeller rotation.

[0070] like Figure 11 As shown, the guide vane in this embodiment has the same or similar features as that in embodiment 5 above. The difference is that in this embodiment, the guide vane 12 is a blade of unequal thickness. The thickness of the guide vane 12 gradually increases from the end near the impeller to the end away from the impeller. One side of the guide vane 12 is a guide arc surface. The end of the guide arc surface near the impeller is deflected by an eighth angle θ8 away from the preset rotation direction of the impeller, and the end of the guide arc surface away from the impeller is deflected by a ninth angle θ9 away from the preset rotation direction of the impeller. The direction of the fluid discharged from the guide arc surface is as follows: Figure 11As shown in the second direction V; compared with embodiment 5, in this embodiment, the thickness of the guide vane 12 gradually increases from the end closer to the impeller to the end farther from the impeller. The purpose of this setting is to reduce the difference between the inlet and outlet distances between two adjacent guide vanes 12. Compared with embodiment 5, the difference between the inlet and outlet distances between two adjacent guide vanes 12 is reduced in this embodiment, which is beneficial to meet some application scenarios where the inlet flow rate and outlet flow rate do not change much. The technical principle of this embodiment is the same as that of embodiment 5, that is, the rotation direction of the fluid L flowing out after being guided by the guide arc surface of the guide vane 12 is opposite to the rotation direction of the impeller, giving the fluid an angular momentum of rotation in the opposite direction. This angular momentum cancels out the angular momentum along the rotation direction of the impeller, thereby achieving the purpose of eliminating vortices. Similarly, in this embodiment, the preset rotation direction of the impeller and the guide vane are strictly limited. The guide vane can only play a guiding role when the impeller rotates in the preset rotation direction. That is, the concave side of the guide vane is selected as the guide arc surface. This way, when the impeller rotates counterclockwise, the fluid discharged from the impeller will not be guided. The selection of the eighth angle θ8 is determined by the direction of the fluid discharged from the impeller, aiming to improve or eliminate vortices while minimizing power loss. Similarly, in this embodiment, the selection of the ninth angle θ9 is set according to the magnitude of the angular momentum of the impeller rotation to be eliminated; preferably, the ninth angle θ9 is less than or equal to 60 degrees. A ninth angle that is too small will have a similar vortex-eliminating effect as the radial guidance effect in Embodiment 1; a ninth angle that is too large will adversely affect the radial or axial flow of the fluid discharged from the impeller, thereby weakening the stirring effect. In this embodiment, the ninth angle θ9 can be the same as or different from the fifth angle θ5 in Embodiment 5.

[0071] In the above embodiments, one type is that at least one guide vane is configured for radial flow guidance, another type is that at least one guide vane is configured for reverse flow guidance, and the present invention also includes a third type, in which at least one guide vane is configured for hybrid flow guidance, the hybrid flow guidance including a first hybrid mode, a second hybrid mode, a third hybrid mode and a fourth hybrid mode.

[0072] The first mixing mode is that the guide vane includes a first part for radial guidance and a second part for reverse guidance. In this mixing mode, the guide vane is divided into two components. The superposition effect of the two components changes the direction of the fluid discharged by the impeller rotation, so as to partially or completely eliminate the circumferential flow part of the fluid discharged by the impeller rotation.

[0073] The second hybrid mode includes a first part used for reverse flow and a second part used for radial or co-directional flow. In this hybrid mode, the guide vanes are also divided into two components. The difference is that the second hybrid mode performs reverse flow first. For the case where the second part is used for co-directional flow, see Specific Embodiment 8 below.

[0074] The third hybrid mode is that in at least one guide vane, a portion of the guide vanes are used for radial flow guidance and another portion of the guide vanes are used for reverse flow guidance, and the two portions of guide vanes are arranged along the same circumference. In this hybrid mode, two portions of guide vanes are arranged on the same circumference, one portion for radial flow guidance and the other portion for reverse flow guidance. The multiple radial flow guidance vanes and the multiple reverse flow guidance vanes in the two portions can be arranged alternately, or the two portions can be separated into their own independent regions.

[0075] The fourth hybrid mode comprises at least one guide vane including inner vanes arranged along a first circumference and close to the impeller, and outer vanes arranged along a second circumference and away from the impeller. The inner vanes are used for radial or reverse flow guidance, and the outer vanes are used to continue radial or reverse flow guidance based on the inner vanes. In this hybrid mode, at least one guide vane includes two sets of guide vanes radially. One set of guide vanes, referred to as the inner vanes, is arranged along the first circumference. The other set of guide vanes, referred to as the outer vanes, is arranged along the second circumference. Depending on the flow guidance method, the inner vanes can be guide vanes for radial flow guidance or guide vanes for reverse flow guidance. Similarly, the outer vanes can be guide vanes for radial flow guidance or guide vanes for reverse flow guidance. For the case where both the inner and outer vanes are reverse flow guides, see Specific Embodiment 9 below.

[0076] The above-described embodiments of mixed flow guidance are similar to those of individual radial flow guidance and reverse flow guidance. In this invention, radial flow guidance is defined as guiding the fluid discharged by the impeller in the radial direction of the impeller rotation, reverse flow guidance is guiding the fluid discharged by the impeller in the opposite direction of the impeller rotation, and co-flow guidance is guiding the fluid discharged by the impeller in the same direction as the impeller rotation.

[0077] Example 8

[0078] Figure 12 This is a schematic diagram of embodiment 8 of the flow guide for stirring according to the present invention; this embodiment details a second mixing mode, which includes a first part used for reverse flow and a second part used for co-flow. Figure 12As shown, the guide vane in this embodiment has the same or similar features as that in embodiment 5 above. The difference is that the guide vane 12 is a uniform thickness vane. The fluid L discharged from the impeller passes through the guide vane 12 and travels along a third direction W, where the third direction W is the same as the preset rotation direction of the impeller. At least one of the two opposing surfaces of the guide vane 12 is a guide surface. The end of the guide surface near the impeller is deflected away from the preset rotation direction of the impeller by a tenth angle θ10, and the end of the guide surface away from the impeller is deflected towards the preset rotation direction of the impeller by an eleventh angle θ11. The direction of the fluid discharged from the guide surface is as follows: Figure 12 As shown in the third direction W; compared with Embodiment 1, in this embodiment, the guide vane 12 is generally in the shape of a spline curve. For example, the section of the guide vane near the impeller can be a guide arc surface similar to that in Embodiment 5, and the section of the guide vane 12 away from the impeller is a guide arc surface curved in the opposite direction. The technical principle of this embodiment is: the flow direction of fluid L changes from the curved surface of the first section to a direction, and then changes from the curved surface of the second section to a direction opposite to the first direction. The angular momentum of the two directions cancels each other out, thereby achieving the purpose of eliminating vortices. In this embodiment, both opposite sides of the guide vane can play a guiding role, or only one side can play a guiding role. When both sides can play a guiding role, the guide vane does not limit the rotation direction of the impeller, and the impeller form can be freely selected. If, given a given impeller rotation direction, for example, due to stirring requirements, the impeller only rotates in a preset direction, a guide vane with a guiding surface on one side can be selected for use. That is, one side of the guide vane is set as a guiding surface, while the opposite side can have other structural forms. In this way, when the impeller rotates counterclockwise along arrow N, the fluid L discharged from the impeller does not interfere with the guide vane. The selection of the tenth angle θ10 is determined by the direction of the fluid discharged from the impeller, aiming to improve or eliminate vortices while minimizing power loss. In this embodiment, the eleventh angle θ11 is selected based on the magnitude of the angular momentum of the impeller rotation to be eliminated; preferably, the eleventh angle is less than or equal to 30 degrees. A smaller eleventh angle results in a vortex-eliminating effect similar to the radial guiding effect in Embodiment 5, while a larger eleventh angle results in a poorer vortex-eliminating effect.

[0079] Example 9

[0080] Figure 13 This is a schematic diagram of embodiment 9 of the flow guide for stirring according to the present invention; this embodiment details a fourth mixing mode, wherein at least one flow guide blade includes an inner blade 124 arranged along a first circumference and close to the impeller, and an outer blade 125 arranged along a second circumference and away from the impeller. The inner blade 124 is used for reverse flow guidance, and the outer blade 125 is used for continuous reverse flow guidance based on the inner blade. Figure 13As shown, the flow guide in this embodiment has the same or similar features as that in embodiment 5 above. The difference is that in this embodiment, at least one flow guide blade includes multiple inner blades 124 and multiple outer blades 125. The multiple inner blades are arranged along a first circumference, and the multiple outer blades 125 are arranged along a second circumference around the multiple inner blades 124. The structure of the multiple inner blades is the same as that in embodiment 5. The multiple outer blades 125 continue to guide the flow in the opposite direction based on the flow guidance of the multiple inner blades. That is, the multiple inner blades are configured to guide the flow in the opposite direction. The fluid L discharged from the impeller 2 flows into the outer blades 125 in the opposite direction to the impeller rotation direction after passing through the inner blades 124, and then continues to be guided in the opposite direction to the impeller rotation direction after passing through the outer blades. This embodiment works on a similar principle to embodiment 5. The fluid L that flows out after being guided by the inner blade 124 and outer blade 125 of the guide vane 1 rotates in the opposite direction to the rotation of the impeller 2, giving the fluid an angular momentum that rotates in the opposite direction (reverse flow guidance). This angular momentum cancels out the angular momentum along the rotation direction of the impeller, thereby achieving the purpose of eliminating vortices.

[0081] Example 10

[0082] Figure 14 This is a schematic diagram of the structure of Embodiment 10 of the flow guide for stirring according to the present invention; as shown. Figure 14 As shown, the guide vane in this embodiment has the same or similar features as that in Embodiment 1 above. The difference is that the height of the guide vanes along the axis of the impeller gradually increases from the end closest to the impeller to the end furthest from the impeller. Setting the guide vanes to be lower on the inside and higher on the outside facilitates the upward axial component of the fluid discharged from the impeller, resulting in better guiding effect with the same stirring blade area.

[0083] Example 11

[0084] Figure 15 This is a schematic diagram of the structure of Embodiment 11 of the flow guide for stirring according to the present invention; as shown Figure 15 As shown, the guide vane in this embodiment has the same or similar features as that in Embodiment 1 above. The difference is that the height of the guide vanes along the axis of the impeller is the same from the end closest to the impeller to the end furthest from the impeller. Setting the guide vanes to have the same height inside and out provides a certain guiding effect for the same stirring blade area. However, because the inner and outer heights are the same, the manufacturing process is relatively simple.

[0085] In the above embodiments, at least one guide vane can be an identical stirring vane or a combination of different stirring vane forms. Preferably, at least one guide vane is an identical stirring vane, which facilitates manufacturing and ensures better consistency of liquid flow in all circumferential directions during mixing. However, this is not a limitation. In some special cases, combinations of guide vanes can be provided as needed, such as the combination of the guide vanes in Embodiment 1 and Embodiment 5. In the above embodiments, at least one guide vane can be evenly spaced along the circumference of the impeller or spaced but unevenly distributed. Preferably, at least one guide vane is evenly spaced along the circumference of the impeller, which ensures better consistency of liquid flow in all circumferential directions during mixing.

[0086] In the above embodiments, at least one guide vane is spaced apart along the circumferential direction of the impeller throughout the entire circumference. This allows for the guidance of fluid discharged from the impeller along its entire circumference, a feature often found when the impeller is positioned at the center of the container. In other embodiments, such as in eccentric stirring applications, at least one guide vane may also be spaced apart along the circumferential direction of the impeller within one or more local angular ranges around the circumference, such as... Figure 16 As shown.

[0087] Example 12

[0088] Figure 16 This is a schematic diagram of embodiment 12 of the flow guide for stirring according to the present invention; in this embodiment, at least one flow guide blade is configured to reverse the flow, which means guiding the fluid discharged by the impeller rotation in a direction opposite to the direction of impeller rotation. Figure 16 As shown, the guide vane in this embodiment has the same or similar features as that in embodiment 5 above. The difference is that in this embodiment, at least one guide vane is arranged at intervals along the circumferential direction of the impeller within a local angular range of the circumference.

[0089] According to an embodiment of the present invention, based on the same inventive concept, a magnetic levitation stirring device is proposed. The magnetic levitation stirring device of the present invention does not limit the form of the container; for example, it can be a rigid container, such as a mixer, reactor, or reaction vessel, or a flexible container, such as a disposable stirring bag. The magnetic levitation stirring device of the present invention does not limit the rotor form of the impeller; for example, the impeller rotor can be an external rotor or an internal rotor. Figure 17 This is a schematic diagram of the structure of the first embodiment of the magnetic levitation stirring device of the present invention; Figure 18 This is a schematic diagram of the second embodiment of the magnetic levitation stirring device of the present invention (impeller omitted); Figure 19 This is a structural schematic diagram of the third embodiment of the magnetic levitation stirring device of the present invention.

[0090] First Embodiment

[0091] See Figure 17 A magnetic levitation stirring device includes a container 3 and an impeller 2 with a magnetic body 21 disposed within the container 3. It also includes a flow guide 1 for stirring as described in the above embodiments, with an annular carrier plate 11 and at least one flow guide blade 12 disposed around the impeller 2. In a preferred embodiment, the container is a rigid container, and the annular carrier plate is fixedly connected to the bottom of the rigid container by fasteners, welding, bonding, or snap-fit. The magnetic levitation stirring device of the present invention, by setting a guide 1 around the impeller 2, directly attaches the guiding effect of at least one guide blade 12 of the guide 1 to the fluid L discharged from the impeller 2. It utilizes the principle of reducing or eliminating the impeller's rotational angular momentum to eliminate vortices by radial guiding, reverse guiding, and changing the guiding direction. Based on the vortex-eliminating advantage of the guide 2, it can significantly improve the mixing effect, increase the stirring efficiency, avoid the influence of vortices on the impeller 2, ensure the stable operation of the impeller 2, and also avoid cavitation and media damage caused by vortices. It can better meet the stirring and mixing needs in clean environments such as biopharmaceutical, semiconductor and chip manufacturing.

[0092] As a variation of the first embodiment, the magnetic levitation stirring device further includes a contactless drive device (not shown in the figure) disposed outside the container. The contactless drive device is configured to drive the impeller to rotate via magnetic coupling. In this way, the magnetic coupling between the impeller inside the container and the contactless drive device eliminates contamination problems, achieves a completely closed system, and prevents leakage. The magnetic levitation stirring device includes either a magnetic stirring device or a magnetic levitation stirring device, both of which include a magnetic rotary actuator disposed outside the container and an impeller disposed inside the container. The magnetic rotary actuator is classified as a magnetic motor or a magnetic levitation motor depending on the magnetic coupling method. The magnetic rotary actuator generates rotational torque and transmits it to the rotor of the impeller via magnetic coupling, thereby driving the stirring blades to rotate, thus stirring the substances inside the container to achieve mixing or dispersion. The working principle of the magnetic coupling between the magnetic motor or magnetic levitation motor and the impeller with a magnetic element is prior art and will not be described further here.

[0093] See also Figure 17The impeller 2 has an inner rotor 22. The container 3 of the magnetic levitation stirring device has a U-shaped rotor cavity 31 that bulges outward at the bottom. The impeller 2 includes a rotor 22 and multiple stirring blades 23 disposed on one side of the rotor 22. A magnetic body 21 for magnetic coupling with a non-contact drive device is embedded inside the rotor 22. The rotor 22 is housed in the rotor cavity 31. At least one guide vane 11 is disposed around the multiple stirring blades 23. Thus, during operation, the magnetic levitation motor drives the rotor 22 of the impeller 2 to rotate. The rotor 22 then drives the stirring blades 23 to rotate and levitate. The rotation of the stirring blades 23 drives the fluid in the container 3 to enter the working area of ​​the stirring blades 23 of the impeller 2 along the axial direction of the impeller 2. Under the stirring action of the stirring blades 23, the impeller 2 discharges the fluid. The fluid is directly changed in flow direction by the guide vanes 11 of the guide vane 1, weakening or eliminating the circumferential flow portion of the fluid discharged by the impeller 2, so that the fluid flows only radially or axially, or mostly radially or axially, thereby achieving the purpose of improving or eliminating vortices. Based on the vortex-eliminating effect of the flow guide, the magnetic levitation stirring device can improve the mixing effect and stirring efficiency, avoid the influence of vortices on the impeller, ensure the stable operation of the impeller, and also avoid cavitation and media damage caused by vortices.

[0094] Second Embodiment

[0095] See Figure 18 The impeller rotor is an external rotor. The container 3 of the magnetic levitation stirring device has an outwardly convex annular rotor cavity 31 at its bottom. The impeller includes a rotor and multiple stirring blades disposed on one side of the rotor. The magnet is embedded inside the rotor, and the rotor is housed within the rotor cavity 31. At least one guide vane 12 is disposed around the periphery of the multiple stirring blades. Since this embodiment has the same or similar features as the first embodiment described above, it has the same reference numerals. This embodiment includes most of the features of the first embodiment and has the same or similar technical principles. Figure 18 Only the container and flow guide are shown; the impeller and magnetic levitation motor are not shown. The difference from the first embodiment is that in this embodiment, the rotor is an outer rotor, and the bottom of the container corresponding to the outer rotor forms an outwardly convex annular rotor cavity. The magnetic coupling component of the magnetic levitation motor is disposed in the hollow portion 32 of the annular rotor cavity. As a variation of the second embodiment, the impeller rotor is an outer rotor, and the rotor cavity at the bottom of the container can also have other structural forms. For example, the bottom of the container has an inwardly convex n-shaped rotor cavity, and the magnetic coupling component of the magnetic levitation motor is disposed within the n-shaped rotor cavity.

[0096] Third Embodiment

[0097] See Figure 19 In this embodiment, the container is a flexible container. To distinguish it from the rigid container in the first embodiment, different reference numerals are used in this embodiment, and single quotation marks are added to the reference numerals. For example... Figure 19 As shown, the flexible container includes a flexible bag 3' and a rigid isolation sleeve 30'. A rotor cavity 31' is formed on the rigid isolation sleeve 30'. The annular carrier plate 12' and the rigid isolation sleeve 30' are integrally formed components, or the annular carrier plate 12' is part of the rigid isolation sleeve 30'. At least one guide vane is formed on the rigid isolation sleeve 30'. This embodiment includes most of the features of the first embodiment and has the same or similar technical principles. Figure 19 Only the container, impeller, and flow guide are shown; the magnetic levitation motor is not shown. The difference from the first embodiment is that in this embodiment, the container is a flexible container, allowing the flexible container and impeller to be made into a disposable mixing bag. In addition to the flexible bag and impeller, the disposable mixing bag also includes accessories such as a feeding port, liquid inlet pipe, liquid outlet pipe, and sampling pipe. When used in conjunction with a magnetic rotary actuator, the disposable mixing bag can easily achieve a stable, scaled-up mixing effect. Figure 19 Only one embodiment of the flexible container is shown, paired with an internal rotor impeller. Depending on the rotor type of the impeller used, the rigid isolation sleeve of the flexible container can be implemented in various ways. Specific implementations can be compared with the rotor cavity portion of the rigid container, and will not be described in detail here.

[0098] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A flow guide for stirring, characterized in that: The flow guide (1) includes an annular carrier plate (11) and at least one flow guide blade (12) disposed on the annular carrier plate. The hollow portion (111) of the annular carrier plate is configured to accommodate an impeller (2) for stirring. The at least one flow guide blade is arranged radially around the impeller. The at least one flow guide blade is configured to change the direction of the fluid discharged by the impeller to partially or completely eliminate the circumferential flow portion of the fluid discharged by the impeller.

2. The flow guide for stirring according to claim 1, characterized in that, The at least one guide vane is configured for radial flow guidance, the radial flow being the fluid discharged by the impeller as it rotates along the radial direction of the impeller.

3. The flow guide for stirring according to claim 2, characterized in that: The guide vane is a uniform thickness vane, and at least one of its two opposing surfaces is a guide arc surface. The guide arc surface near the impeller is deflected away from the impeller's preset rotation direction by a first angle (θ1), while the guide arc surface away from the impeller approaches the radial direction of the impeller. Alternatively, the guide vane is a non-uniform thickness vane, and at least one of its two opposing surfaces is a guide plane along the radial direction of the impeller. Alternatively, the guide vane is a non-uniform thickness vane, and the thickness of the guide vane gradually increases from the end near the impeller to the end away from the impeller. One side of the guide vane is a guide arc surface, and the guide arc surface near the impeller is deflected away from the impeller's preset rotation direction by a first angle (θ1). A second angle (θ2) is deflected in the preset rotation direction, and the guide arc surface away from the impeller approaches the radial direction of the impeller; the guide blade is a blade of unequal thickness, and the guide blade includes a flow-guiding section (121) close to the impeller and a flow-guiding section (122) away from the impeller. At least one of the two opposite sides of the flow-guiding section is a flow-guiding arc surface, and at least one of the two opposite sides of the flow-guiding section is a flow-guiding straight plane. The flow-guiding arc surface of the flow-guiding section is transitionally connected to the corresponding flow-guiding straight plane of the flow-guiding section. The flow-guiding arc surface close to the impeller deflects in the preset rotation direction away from the impeller by a third angle (θ3), and the flow-guiding straight plane away from the impeller is arranged along the radial direction of the impeller.

4. The flow guide for stirring according to claim 1, characterized in that, The at least one guide vane is configured to guide the flow in the opposite direction to the direction of the impeller rotation, which guides the fluid discharged from the impeller in the opposite direction to the direction of the impeller rotation.

5. The flow guide for stirring according to claim 4, characterized in that: The guide vane is a uniform thickness vane, and one side of the guide vane is a guide arc surface. The end of the guide arc surface near the impeller is deflected at a fourth angle (θ4) away from the preset rotation direction of the impeller, and the end of the guide arc surface away from the impeller is deflected at a fifth angle (θ5) away from the preset rotation direction of the impeller; or, the guide vane is a uniform thickness vane, and one side of the guide vane is a guide bending surface, the guide bending surface including multiple guide sub-segments (123) that are connected in sequence and bent into an arc shape as a whole, the guide sub-segment near the impeller facing away from the preset rotation direction of the impeller. The direction deflection is at a sixth angle (θ6), and the guide vane away from the impeller deflects at a seventh angle (θ7) away from the preset rotation direction of the impeller; or, the guide vane is a blade of unequal thickness, the thickness of the guide vane gradually increases from the end near the impeller to the end away from the impeller, one side of the guide vane is a guide arc surface, the end of the guide arc surface near the impeller deflects at an eighth angle (θ8) away from the preset rotation direction of the impeller, and the end of the guide arc surface away from the impeller deflects at a ninth angle (θ9) away from the preset rotation direction of the impeller.

6. The flow guide for stirring according to claim 1, characterized in that, The at least one guide vane is configured for hybrid flow guidance, which includes a first hybrid mode, a second hybrid mode, a third hybrid mode, and a fourth hybrid mode. The first hybrid mode comprises a guide vane consisting of a first portion used for radial flow guidance and a second portion used for reverse flow guidance. The second hybrid mode comprises a first portion used for reverse flow guidance and a second portion used for radial or syn-flow guidance. The third hybrid mode comprises at least one guide vane, in which a portion is used for radial flow guidance and another portion for reverse flow guidance, with the two portions arranged along the same circumference. The fourth mixing mode is that the at least one guide vane includes inner vanes arranged along a first circumference and close to the impeller, and outer vanes arranged along a second circumference and away from the impeller. The inner vanes are used for radial or reverse flow guidance, and the outer vanes are used to continue radial or reverse flow guidance based on the inner vanes. The radial flow guidance is guiding the fluid discharged by the impeller along the radial direction of the impeller. The reverse flow guidance is guiding the fluid discharged by the impeller in a direction opposite to the direction of the impeller's rotation. The co-current flow guidance is guiding the fluid discharged by the impeller in the same direction as the direction of the impeller's rotation.

7. The flow guide for stirring according to claim 1, characterized in that: The annular carrier plate is circular, square, or elliptical.

8. The flow guide for stirring according to claim 1, characterized in that: At least one of the two opposite sides of the annular carrier plate is a bearing surface, and the guide vane is connected to the annular carrier plate perpendicular to or nearly perpendicular to the bearing surface.

9. The flow guide for stirring according to claim 1, characterized in that: The guide vane and the annular carrier plate are integrally formed components.

10. The flow guide for stirring according to claim 1, characterized in that: One end of the guide vane is positioned close to the impeller and at a first distance from the outer diameter of the impeller, while the other end of the guide vane is positioned away from the impeller. The first distance is not less than 2 mm.

11. The flow guide for stirring according to claim 1, characterized in that: From the end closest to the impeller to the end furthest from the impeller, the guide vanes are at the same height or gradually increase or decrease in the axial direction of the impeller.

12. The flow guide for stirring according to any one of claims 1-11, characterized in that: The at least one guide vane is arranged at intervals along the circumferential direction of the impeller over the entire circumference or within one or more local angular ranges of the circumference.

13. A magnetically levitated stirring device, comprising a container (3) and an impeller (2) with a magnetic body (21) disposed within the container, characterized in that: It also includes a flow guide (1) for stirring as described in any one of claims 1-12, wherein the annular carrier plate (11) and at least one flow guide blade (12) of the flow guide are disposed around the impeller.

14. A magnetic levitation stirring device according to claim 13, characterized in that: The magnetic levitation stirring device also includes a magnetic levitation motor disposed outside the container, the magnetic levitation motor being configured to drive the impeller to rotate and levitate in a magnetically coupled manner.

15. A magnetic levitation stirring device according to claim 13, characterized in that: The bottom of the container has an outwardly protruding U-shaped rotor cavity (31). The impeller includes a rotor (22) and a plurality of stirring blades (23) disposed on one side of the rotor. The magnetic body (21) is embedded inside the rotor. The rotor is housed in the rotor cavity. At least one guide vane is disposed around the plurality of stirring blades.

16. A magnetic levitation stirring device according to claim 13, characterized in that: The container has an outwardly convex annular rotor cavity at its bottom. The impeller includes a rotor and a plurality of stirring blades disposed on one side of the rotor. The magnet is embedded inside the rotor. The rotor is housed within the rotor cavity. At least one guide vane is disposed around the plurality of stirring blades.

17. A magnetic levitation stirring device according to claim 15 or 16, characterized in that: The container is a flexible container, which includes a flexible bag and a rigid isolation sleeve. The rotor cavity is formed on the rigid isolation sleeve. The annular carrier plate and the rigid isolation sleeve are integrally formed components, or the annular carrier plate is part of the rigid isolation sleeve. The at least one guide vane is formed on the rigid isolation sleeve.

18. A magnetic levitation stirring device according to any one of claims 13-16, characterized in that: The container is a rigid container, and the annular carrier plate is fixedly connected to the bottom of the rigid container by fasteners, welding, bonding, or snap-fit.

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