Magnetic suspension anti-deposition stirrer

Abstract

The utility model discloses a magnetic suspension anti-deposition stirrer which is characterized in that a circulation groove radially communicated with a containing groove is formed in a shell top, a medicine dispensing bag is arranged on the shell top, a rotor main body falls into the containing groove, and liquid raw materials are input into the medicine dispensing bag for stirring; the medicine dispensing bag part falls into the containing groove along with the rotor body and is attached to the containing groove and the circulation groove under the pressure effect of liquid, so that a radial notch is formed in an annular space between the rotor body and the side wall of the containing groove due to the circulation groove. During stirring, liquid raw materials in the annular space can be thrown out when rotating to pass through the radial notches to form upward liquid flow which passes through the circulating groove from the containing groove in the radial direction, and meanwhile the liquid raw materials can be sucked into the annular space from the upper portion to be supplemented and prevented from being deposited, so that the liquid raw materials in the annular space are continuously replaced and participate in stirring and mixing above, and the stirring efficiency is improved. The problem that a built-in magnetic suspension anti-deposition stirrer of an existing rotor structure is insufficient in stirring can be effectively solved, and the uniformity of stirred drugs can be improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of floating stirring in mixed operations, specifically relating to a magnetic levitation anti-settling stirrer. Background Technology

[0002] In the manufacturing process of pharmaceuticals, the mixing of liquid raw materials is frequently involved. Traditional agitators often present the following problems: mechanical bearings require physical contact, resulting in friction and wear. Abrasive particles generated by this friction can enter the drug, affecting its purity and quality. The preparation of some special drugs requires low-temperature conditions, and the energy loss from friction causes significant heat generation in the agitator, thus affecting the drug's activity. To reduce friction and wear, traditional agitators typically require lubricants, which may seep into the drug, causing contamination and affecting its safety and efficacy. In summary, using traditional agitators can lead to a series of problems, including drug contamination, energy loss, and heat generation.

[0003] To overcome the above problems, the applicant designed a magnetically levitated anti-deposition stirrer, as detailed in CN117424364B, as per the appendix to this application. Figure 1 and 2 As shown, the magnetic levitation anti-deposition stirrer includes a stator structure and an outer rotor structure. The stator structure includes a housing and a stator core circumferentially distributed within the housing. Coils are wound on the stator core, forming a stator winding. The outer rotor structure includes a base rotatably mounted outside the housing. A permanent magnet is installed in the base to cooperate with the stator winding to rotate the base. An impeller is located on the side of the base away from the housing. The application scenario for this magnetic levitation anti-deposition stirrer is to install it at the bottom of a container, where the impeller rotation provides the stirring effect. For details, please refer to another application by the applicant, CN117498721B. After trial use, it was found that this magnetic levitation anti-deposition stirrer, combined with container stirring, is well-suited for stirring tasks involving pharmaceuticals with low requirements for timeliness and purity. However, for stirring tasks involving pharmaceuticals with high requirements for timeliness and purity, it is not only necessary to carefully clean the container before stirring to avoid the impact of residues from the previous stirring on the purity of the current stirring, making it more cumbersome to use, but also requires additional time to transfer the pharmaceuticals after stirring, making it difficult to guarantee the timeliness of the pharmaceuticals. To this end, the applicant also attempted to design a magnetically levitated anti-settling stirrer with an internal rotor. The rotor structure includes a cylindrical rotor body containing a permanent magnet, and an impeller on one side of the rotor body. The stator structure can be found in the appendix of Chinese Patent CN116526728A. Figure 1 and attached Figure 5Its casing consists of a housing and a top attached to the upper part of the housing. Multiple stator cores are evenly distributed circumferentially inside the housing. The top of the housing has downward-facing receiving grooves located between the stator cores. The rotor structure is placed in a flexible dosing bag or a rigid dosing container whose bottom fits the receiving groove or the entire top of the housing. Taking a dosing bag as an example, during use, the dosing bag is placed on the top of the housing, with the rotor body positioned in the receiving groove. After the liquid raw material to be mixed is added to the dosing bag, the dosing bag portion falls into the receiving groove along with the rotor body and, under the action of liquid pressure, mixes with the rotor. After the receiving slot is fitted and the stator structure is started, the rotor body maintains a gap with the drug bag under the action of magnetic force and rotates and stirs. After stirring is completed, the drug bag can be directly removed for use without secondary transfer, which helps to ensure the timeliness of the medicine. Using the disposable drug bag as a container for stirring and storing medicine helps to ensure the purity of the medicine. It is especially suitable for stirring tasks with small stirring volume and high requirements for timeliness and purity. The rotor structure can be used for single use or can be taken out of the drug bag for cleaning and recycling after the medicine is used. However, after trial use, it was found that to meet the performance and size requirements of the magnetic levitation anti-deposition stirrer, the diameter of the rotor body and the container tank are quite close. This makes the gap between the rotor body and the part of the medicine bag that falls into the container tank extremely narrow. Unlike the rotor body, which rotates in a container or larger gap to create turbulence and small vortices (similar to stirring coffee with a spoon), thus helping the liquid raw materials to roll and mix, this extremely narrow gap completely inhibits this effect. During stirring, the liquid raw materials in this gap form concentric laminar flow outside the rotor body, causing this part of the liquid raw materials to mainly rotate with the rotor body and making it difficult to migrate upwards and mix with the other liquid raw materials above. This leads to the liquid raw materials settling in this gap. In addition, since the flexible medicine bag is made of soft plastic (similar to an IV bag), it will have a certain adsorption effect on the liquid raw materials. In this narrow gap, this adsorption effect will be amplified, causing the lipid components in the liquid raw materials to adhere more easily to the inner wall of the medicine bag, thus further aggravating the deposition of liquid raw materials in this gap. This makes it difficult to guarantee the uniformity of the stirred medicine. Therefore, further improvements are needed. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a magnetic levitation anti-deposition stirrer, which solves the technical problems of easy deposition and insufficient stirring in the current magnetic levitation stirrers with built-in rotor structure, and achieves the effect of improving stirring performance and practicality.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A magnetically levitated anti-settling agitator includes a stator structure and a rotor structure. The stator structure includes a shell top with a circular receiving groove on the shell top, and multiple stator cores evenly distributed around the outer circumference of the receiving groove. The rotor structure includes a circular rotor body with a diameter smaller than the inner diameter of the receiving groove. A permanent magnet is installed inside the rotor body. The rotor body is located within the receiving groove and can levitate and rotate when the stator structure is energized. Agitating blades are located on the side of the rotor body away from the receiving groove. The shell top also has a flow groove that is radially connected to the receiving groove. Circumferentially, the flow groove is located between two adjacent stator cores.

[0007] Optionally, there are multiple flow channels that are evenly distributed circumferentially, and the flow channels and stator core are alternately distributed circumferentially.

[0008] The bottom surface of the flow channel is smoothly connected to the radial sidewall via an arc surface.

[0009] Optionally, there are eight stator cores and four flow slots distributed circumferentially, with two stator cores between two adjacent flow slots in the circumferential direction.

[0010] On the top of the shell, the depth of the receiving groove is greater than the depth of the flow groove, and the bottom surface of the receiving groove is smoothly connected to the side wall by an arc surface.

[0011] The flow channel is fan-shaped and the short arc connects to the receiving channel.

[0012] Furthermore, a spiral guide groove is provided on the outer circumference of the rotor body. When the guide groove is suspended and rotated with the rotor body, it exerts a force on the liquid towards the bottom of the receiving groove.

[0013] Optionally, the magnetic levitation anti-deposition stirrer of this utility model also includes a flexible dosing bag, in which the rotor structure is movably placed. The dosing bag is partially pressed into the receiving groove and the flow groove, and the thickness of the dosing bag is less than the distance between the rotor body and the side wall of the receiving groove when the rotor body is suspended and rotating.

[0014] Optionally, the magnetic levitation anti-deposition stirrer of this utility model also includes a rigid dispensing tank, in which the rotor structure is movably placed. The bottom of the dispensing tank has a mating part with an outer protrusion and an inner corresponding recess. The mating part is located in the connected receiving groove and the flow groove and the size is matched. The thickness of the mating part is less than the distance between the rotor body and the side wall of the receiving groove when the rotor body is suspended and rotated.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The magnetic levitation anti-settling agitator of this utility model, while maintaining a narrow gap between the rotor body and the receiving groove (the outer stator core) to ensure stable rotor operation, fundamentally breaks the fluid boundary restriction of the annular space formed by the receiving groove in the prior design by setting a flow groove on the top of the shell that is radially connected to the receiving groove. This creates circumferentially distributed fluid discharge windows in the flow channel of the annular space. That is, the annular space between the rotor body and the side wall of the receiving groove has a radial gap due to the presence of the flow groove. During agitation, although the liquid raw material in the annular space forms a concentric laminar flow outside the rotor body, the high-speed rotating liquid layer encounters sudden pressure release when passing through the radial gap. This generates a radial jet stream dominated by centrifugal force. Some liquid raw materials are thrown out from the radial notch into the flow channel, forming a liquid flow that flows radially from the containment tank through the flow channel and then upwards. Correspondingly, the local low pressure caused by the radial jet stream causes the liquid raw materials above to be drawn back into the annular space through the top of the containment tank, forming a closed loop. That is, the liquid raw materials are drawn in from above to replenish the annular space, so that the liquid raw materials in the annular space are constantly replaced and participate in the mixing above, preventing the liquid raw materials from settling in the annular space. This can effectively solve the problems of easy sedimentation and insufficient mixing of the magnetic levitation stirrer built into the rotor structure, and is conducive to improving the uniformity of the medicine obtained by mixing.

[0017] 2. The magnetic levitation anti-settling agitator of this utility model is designed with the bottom surface of the flow channel and the radial sidewall smoothly connected by an arc surface, which has the following advantages: 1) The arc surface design eliminates the resistance of "sharp turns": changing the right-angle connection between the bottom surface of the flow channel and the radial sidewall to an arc transition allows the liquid material to flow into the flow channel from the annular space without suddenly hitting the "corner" and causing turbulence, but instead naturally turning along the arc surface, making the liquid flow more stable. 2) Acceleration effect: the turning of the liquid material at the arc surface can generate an acceleration effect with the help of centrifugal force. 3) Ensuring stable rotation of the rotor body: if the bottom surface of the flow channel and the radial sidewall are connected at a right angle, the liquid material flowing into the flow channel from the annular space will encounter a right angle and generate a backflow, which can easily impact the suspended rotating rotor body and cause it to shake. 4) Self-cleaning and residue prevention: If the bottom surface of the flow channel is connected to the radial sidewall at a right angle, the liquid material will be prone to some residue when it encounters the right angle due to impact and speed reduction when it rushes into the flow channel from the annular space. However, after changing the right angle connection between the bottom surface of the flow channel and the radial sidewall to an arc transition, there are no dead angles in the flow direction, and it is not easy for residue to occur. Moreover, the liquid material will be accelerated when passing through the arc, thus producing a rinsing effect. Therefore, designing the bottom surface of the flow channel to be smoothly connected to the radial sidewall through an arc can make the liquid material flow more smoothly and steadily from the container tank through the flow channel upward, which is conducive to improving the flow circulation speed of the liquid material in the container tank and reducing its impact on the rotation of the rotor body.

[0018] 3. The magnetic levitation anti-settling stirrer of this utility model has a spiral guide groove on the outer circumference of the rotor body. The guide groove can be a right spiral and the rotor body can be suspended and rotated counterclockwise, or the guide groove can be a left spiral and the rotor body can be suspended and rotated clockwise. When the guide groove is suspended and rotated with the rotor body, it generates a force on the liquid towards the bottom of the container, thereby accelerating the circulation of the liquid raw material in the container and improving the stirring and mixing effect. Attached Figure Description

[0019] Figure 1 This is a top view of the magnetic levitation anti-deposition stirrer described in Example 1;

[0020] Figure 2 For along Figure 1 Schematic diagram of the cross section of AA;

[0021] Figure 3 For along Figure 1 A schematic diagram of the cross-section of BB;

[0022] Figure 4 This is a schematic diagram showing the usage state of the magnetic levitation anti-deposition stirrer described in Example 1;

[0023] Figure 5 This is a perspective view of the magnetic levitation anti-deposition stirrer described in Example 2;

[0024] Figure 6 for Figure 5 A schematic diagram of the rotor structure is omitted.

[0025] Figure 7 for Figure 6 A schematic diagram with the top of the shell hidden;

[0026] The components include: shell top 11, receiving groove 12, stator core 13, flow groove 14, housing 15, connecting frame 16, first arc surface 17; rotor body 21, permanent magnet 22, blades 23; medicine bag 31, liquid raw material 41, and second arc surface 51. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0028] Example 1:

[0029] Please see Figure 1 , Figure 2 and Figure 3A magnetically levitated anti-deposition stirrer includes a stator structure and a rotor structure. The stator structure includes a shell top 11 with a circular receiving groove 12. Multiple stator cores 13 are evenly distributed around the outer periphery of the receiving groove 12, and coils are wound on the stator cores 13, forming a stator winding. The rotor structure includes a circular rotor body 21 with a diameter smaller than the inner diameter of the receiving groove 12. A permanent magnet 22 is provided inside the rotor body 21. The rotor body 21 is located within the receiving groove 12 and can levitate and rotate when the stator winding is energized. The side of the rotor body 21 away from the receiving groove 12 has stirring blades 23. The shell top 11 also has a flow groove 14 that is radially connected to the receiving groove 12. In the circumferential direction, the flow groove 14 is located between two adjacent stator cores 13.

[0030] In implementation, the magnetic levitation anti-deposition agitator can be equipped with a dosing bag 31 made of flexible material or a dosing tank made of rigid material as a container for holding and agitating liquid raw materials. Please refer to [link to relevant documentation]. Figure 4 When selecting the dispensing bag 31, the rotor structure should be movably placed within the dispensing bag 31. During use, the rotor body 21 is adjusted and moved into the receiving groove 12. Simultaneously, part of the dispensing bag 31 is pressed into the receiving groove 12 and the flow groove 14. The thickness of the dispensing bag 31 should be less than the distance between the rotor body 21 and the side wall of the receiving groove 12 when it is levitating and rotating, to avoid affecting the levitating and rotating of the rotor body 21. When selecting the dispensing container, the rotor structure is movably placed within the container. The bottom of the container should have a mating part with an outer protrusion and a corresponding inner recess. The outer contour dimension of the protrusion of the mating part should correspond to the dimensions of the connected receiving groove 14. 2. The mating part is fully matched with the flow groove 14. When in use, the mating part is inserted into the connected receiving groove 12 and the flow groove 14, and the rotor body 21 is placed into the recess of the mating part and the position corresponding to the receiving groove 12. The thickness of the mating part should be less than the distance between the rotor body 21 and the side wall of the receiving groove 12 when the rotor body 21 is suspended and rotating, so as to avoid affecting the suspension and rotation of the rotor body 21. In this embodiment, the stator structure includes a housing, which is composed of a cylindrical housing 15 and the aforementioned housing top 11 connected to the upper end of the housing 15. Each stator core 13 is axially arranged in the housing 15 and fixed by an annular connecting frame 16.

[0031] The magnetic levitation anti-deposition stirrer described in this utility model, such as Figure 1 and Figure 3 As shown, a flow channel 14 is provided on the top 11 of the shell, which is radially connected to the receiving groove 12, such as... Figure 4As shown, the rotor structure is placed in a flexible dosing bag 31, which is then placed on the top of the shell 11, allowing the rotor body 21 to fall into the receiving groove 12. When liquid raw material 41 is fed into the dosing bag 31 for stirring, part of the dosing bag 31 falls into the receiving groove 12 along with the rotor body 21. Under the pressure of the liquid raw material 41, it adheres to both the receiving groove 12 and the flow groove 14, creating a radial gap in the annular space between the rotor body 21 and the sidewall of the receiving groove 12 due to the presence of the flow groove 14. During stirring, the liquid raw material in the annular space will... 1. A concentric laminar flow is formed outside, but when the laminar flow passes through the radial gap, due to the lack of radial restraint, some liquid raw materials will be thrown out from the radial gap and enter the flow channel 14, forming a liquid flow that flows radially from the containment tank 12 through the flow channel 14 and then upward. Correspondingly, the liquid raw materials will be sucked into the annular space from above to replenish it, so that the liquid raw materials in the annular space are constantly replaced and participate in the mixing above, preventing the liquid raw materials from depositing in the annular space. This can effectively solve the problem of insufficient mixing of the built-in magnetic levitation anti-deposition stirrer in the current rotor structure, and is conducive to improving the uniformity of the medicine obtained by mixing.

[0032] Please see Figure 1 , Figure 2 and Figure 3 The flow channels 14 are multiple and evenly distributed around the circumference. In the circumferential direction, the flow channels 14 and the stator core 13 are alternately distributed. In this way, when stirring, the liquid raw material 41 above enters the annular space between the rotor body 21 and the accommodating channel 12 and can flow to the surroundings and circulate upwards in a relatively uniform manner. This not only helps to ensure the stability of the rotor body 21 rotation, but also helps to improve the stirring and mixing effect.

[0033] Please see Figure 3 The bottom surface of the flow channel 14 is smoothly connected to the radial side wall through the first arc surface 17; in this way, the liquid raw material flows more smoothly and steadily upward from the container tank 12 through the flow channel 14, which is conducive to increasing the flow speed of the liquid raw material in the container tank 12 and reducing its impact on the rotation of the rotor body 21.

[0034] Please see Figure 2 and Figure 3 A spiral guide groove (not shown in the figure) is provided on the outer circumference of the rotor body 21. When the guide groove is suspended and rotated with the rotor body 21, it generates a force on the liquid towards the bottom of the receiving tank 12. Specifically, the guide groove can be a right spiral and the rotor body can be suspended and rotated counterclockwise, or the guide groove can be a left spiral and the rotor body can be suspended and rotated clockwise. In this way, when the rotor body rotates, the guide groove causes the liquid raw material 41 in the annular space to form a vortex towards the bottom of the receiving tank 12, thereby accelerating the circulation of the liquid raw material in the receiving tank 12 and improving the mixing effect.

[0035] Example 2:

[0036] The difference from Example 1 is that, please refer to [link / reference needed]. Figure 5 The flow channel 14 is fan-shaped and the short arc connects to the receiving channel 12. Thus, as described in Embodiment 1, "although the liquid raw material in the annular space during stirring will form a concentric laminar flow outside the rotor body 21, when the laminar flow passes through the radial gap, due to the lack of radial restraint, some of the liquid raw material will be thrown out from the radial gap and enter the flow channel 14, forming a liquid flow that flows radially from the receiving channel 12 through the flow channel 14 and then upwards." In this embodiment, the flow channel 14 is fan-shaped and the fan shape connects to the receiving channel 12 through the side where the short arc is located. This allows the liquid raw material accelerated by the rotor body 21 to be quickly dispersed and depressurized after being thrown out from the radial gap. This makes the liquid raw material in the annular space flow out of the flow channel 14 and mix with the liquid raw material above more smoothly, which is beneficial to improving the operational stability of the magnetic levitation anti-deposition stirrer.

[0037] Additionally, please see Figure 6 On the top of the shell 11, the depth of the receiving groove 12 is greater than the depth of the flow groove 14, and the bottom surface of the receiving groove 12 is smoothly connected to the side wall by the second arc surface 51; please refer to Figure 7 There are eight stator cores 13 and four flow slots 14 distributed circumferentially. In the circumferential direction, there are two stator cores 13 between two adjacent flow slots 14.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A magnetically levitated anti-settling stirrer, characterized in that: It includes a stator structure and a rotor structure. The stator structure includes a shell top with a circular receiving slot on the shell top. Multiple stator iron cores are evenly distributed around the outer circumference of the receiving slot. The rotor structure includes a circular rotor body with a diameter smaller than the inner diameter of the receiving slot. The rotor body contains permanent magnets and is located within the receiving slot. It can levitate and rotate when the stator structure is energized. The side of the rotor body away from the receiving slot has stirring blades. The shell top also has a flow groove that is radially connected to the receiving slot. In the circumferential direction, the flow groove is located between two adjacent stator iron cores.

2. The magnetic levitation anti-settling stirrer according to claim 1, characterized in that: There are multiple flow channels that are evenly distributed circumferentially. In the circumferential direction, the flow channels and the stator core are alternately distributed.

3. The magnetic levitation anti-settling stirrer according to claim 1, characterized in that: The bottom surface of the flow channel is smoothly connected to the radial sidewall via an arc surface.

4. The magnetic levitation anti-settling stirrer according to claim 1, characterized in that: A spiral guide groove is provided on the outer circumference of the rotor body. When the guide groove is suspended and rotated with the rotor body, it exerts a force on the liquid towards the bottom of the receiving tank.

5. The magnetic levitation anti-settling stirrer according to claim 1, characterized in that: It also includes a flexible drug dispensing bag, in which the rotor structure is movably placed. The drug dispensing bag is partially pressed into the receiving groove and the flow groove. The thickness of the drug dispensing bag is less than the distance between the rotor body and the side wall of the receiving groove when the rotor body is suspended and rotating.

6. The magnetic levitation anti-settling stirrer according to claim 1, characterized in that: It also includes a rigid dispensing tank, in which the rotor structure is movably placed. The bottom of the dispensing tank has a mating part with an outer protrusion and a corresponding inner recess. The mating part is located in a connected receiving groove and a flow groove and the dimensions match. The thickness of the mating part is less than the distance between the rotor body and the side wall of the receiving groove when the rotor body is suspended and rotating.

7. The magnetic levitation anti-settling stirrer according to claim 1, characterized in that: On the top of the shell, the depth of the receiving groove is greater than the depth of the flow groove, and the bottom surface of the receiving groove is smoothly connected to the side wall by an arc surface.

8. The magnetic levitation anti-settling stirrer according to claim 1, characterized in that: The flow channel is fan-shaped and the short arc connects to the receiving channel.

9. The magnetic levitation anti-settling stirrer according to claim 1, characterized in that: There are eight stator cores and four flow slots distributed circumferentially. In the circumferential direction, there are two stator cores between two adjacent flow slots.

Images