Low-shear bottom magnetic stirring impeller structure

Abstract

This utility model relates to the field of magnetic stirrer technology, specifically a low-shear-force bottom magnetic stirring rotor structure. It includes a power assembly comprising a drive motor, a drive housing, and a protective sleeve; and a stirring assembly including an isolation cover with a column at its end. A rotating ring is fitted onto the outer wall of the column, and stirring blades are mounted on the outer wall of the rotating ring. A locking component inside the rotating ring secures the stirring blades. The locking component within the rotating ring cavity, in conjunction with the stirring blade mounting post and push block, allows for quick assembly and disassembly of the stirring blades with simple insertion and removal. The cooperation between the protruding post and the counterweight ensures synchronous movement of the limiting ring. A flexible sealing ring at the mounting opening prevents external media from entering the cavity. During stirring, the counterweight is displaced by centrifugal force, causing the locking groove to enter the sliding groove, preventing the stirring blades from falling off. After rotation stops, a second elastic element pushes the counterweight and limiting ring back to their original positions, restoring the stirring blades to a detachable state. This improves operational convenience while ensuring reliable stirring.

Description

Technical Field

[0001] This utility model relates to the field of magnetic stirrer technology, and in particular to a bottom magnetic stirring rotor structure with low shear force. Background Technology

[0002] In biopharmaceutical, food processing, and fine chemical industries, magnetic stirrers are widely used for material mixing operations due to their advantages of eliminating mechanical seal wear and preventing material contamination. This is especially true for materials sensitive to shear forces, such as biological agents, high-viscosity colloids, and easily demulsified fluids, where a low-shear stirring rotor structure is required to minimize damage to the material's molecular structure or alteration of its physical properties during mixing. Bottom-mounted magnetic stirring rotors, which can be installed at the bottom of the mixing tank, provide stable mixing from the bottom, further reducing disturbance to the material. This has made them a mainstream choice for low-shear mixing scenarios, and industry requirements for their structural stability, protective performance, and ease of operation are constantly increasing with application needs.

[0003] The existing bottom magnetic stirring rotor structure still has many problems and is difficult to adapt to the actual needs of low-shear stirring scenarios. First, the drive shaft lacks an effective protective structure, which makes it easy to come into direct contact with external parts or materials, causing wear and shortening the service life of the drive components. At the same time, the isolation structure design is not perfect, making it difficult to reliably isolate the inside of the stirring tank from the external environment. Second, the stirring blade fixing method is complicated. Disassembly and assembly require disassembling the rotating ring or the entire stirring head, which cannot achieve quick replacement. When it is necessary to change the stirring blade to adapt to materials with different characteristics, the operation is time-consuming and inefficient. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model is proposed.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a bottom magnetic stirring rotor structure with low shear force, which includes a power component, including a drive motor and a drive box located at the end of the drive motor, wherein a drive shaft is provided at the axis of the drive box and a protective sleeve is provided on the outer wall of the drive shaft; A stirring assembly includes an isolation cover, a column at the end of the isolation cover, a rotating ring sleeved on the outer wall of the column, and stirring blades arrayed on the outer wall of the rotating ring. A locking component is provided inside the rotating ring to fix the stirring blades. A rotating shell is also sleeved on the outer wall of the isolation cover and is fixedly connected to the rotating ring to drive the rotating ring and stirring blades to rotate.

[0006] As a preferred embodiment of the low-shear-force bottom magnetic stirring rotor structure of this utility model, the inner wall of the rotating ring is provided with a cavity and the outer wall of the rotating ring is provided with an installation port, and the inner wall of the installation port is provided with a flexible sealing ring.

[0007] As a preferred embodiment of the low shear force bottom magnetic stirring rotor structure of this utility model, wherein: the locking member is disposed inside the cavity and the locking member includes a limiting ring, and the end face of the limiting ring is provided with a positioning hole.

[0008] As a preferred embodiment of the low-shear-force bottom magnetic stirring rotor structure of this utility model, the outer wall of the positioning hole is further provided with a sliding groove, and the end face of the positioning hole is further provided with an inclined surface.

[0009] As a preferred embodiment of the low shear force bottom magnetic stirring rotor structure of this utility model, wherein: the cavity inner wall array has a limiting groove, the limiting groove is provided with a ball, and the end of the ball extends into the groove opened at the end of the limiting ring.

[0010] As a preferred embodiment of the low-shear-force bottom magnetic stirring rotor structure of this utility model, wherein: the inner wall of the limiting groove is further provided with a first elastic element and the first elastic element is used to push the ball bearing.

[0011] As a preferred embodiment of the low shear force bottom magnetic stirring rotor structure of this utility model, the stirring blade end is provided with a mounting column, the mounting column end is provided with a pushing block, and the inner wall of the pushing block is also provided with a slot.

[0012] As a preferred embodiment of the low-shear-force bottom magnetic stirring rotor structure of this utility model, wherein: the end of the stirring blade extends to the inner wall of the mounting port and compresses the flexible sealing ring.

[0013] As a preferred embodiment of the low shear force bottom magnetic stirring rotor structure of this utility model, the outer wall of the limiting ring is arrayed with protruding columns, the outer wall of the protruding columns is equipped with a counterweight, and the inner wall of the counterweight is provided with a movable cavity for the protruding columns to move.

[0014] As a preferred embodiment of the low shear force bottom magnetic stirring rotor structure of this utility model, wherein: the outer wall of the counterweight is further provided with a second elastic element and the other end of the second elastic element is fixed to the inner wall of the cavity.

[0015] The beneficial effects of this utility model are as follows: the matching design of the power component and the stirring component ensures the stability and protection of the stirring. The drive motor drives the drive shaft to rotate, and the protective sleeve on the outer wall of the drive shaft can prevent it from directly contacting and wearing with external parts or materials. The isolation cover can isolate the tank from the external environment. At the same time, the drive shaft achieves magnetic coupling with the magnet inside the rotating shell through the external magnet, which drives the rotating blade, which is fixed to the rotating shell, to rotate stably around the column at the end of the isolation cover. This ensures that the stirring blade stirs the material smoothly in a low-shear manner, which is suitable for shear-sensitive application scenarios.

[0016] The engaging components within the rotating ring cavity, along with the mounting post and pushing block of the stirring blade, allow for quick assembly and disassembly of the stirring blade simply by inserting and removing them. The engagement of the protruding post and the counterweight ensures synchronized movement of the limiting ring, while the flexible sealing ring at the mounting opening prevents external media from entering the cavity. During stirring, the counterweight, driven by centrifugal force, displaces the limiting ring, causing the locking groove to enter a smooth, narrow-opening slot, preventing the stirring blade from detaching. After rotation stops, the second elastic element pushes the counterweight and limiting ring back to their original positions, restoring the stirring blade to its detachable state. This design enhances operational convenience while ensuring reliable stirring. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a bottom magnetic stirring rotor with low shear force according to this utility model; Figure 2 This is a schematic diagram of the overall structure of the stirring assembly in this utility model; Figure 3 This is a side sectional view of the rotating ring in this utility model; Figure 4 This is a schematic diagram showing the installation relationship between the stirring blade and the rotating ring in this utility model; Figure 5 This is a schematic diagram of the installation structure of the limiting ring in this utility model; Figure 6 This utility model Figure 5 Enlarged schematic diagram of the structure at point A in the middle.

[0019] Reference numerals: 100, power assembly; 101, drive motor; 102, drive housing; 103, protective cover; 200. Stirring assembly; 201. Isolation cover; 2011. Column; 202. Rotating ring; 2021. Cavity; 2022. Mounting port; 2023. Limiting groove; 203. Rotating shell; 204. Stirring blade; 2041. Mounting column; 2042. Push block; 2043. Slot; 205. Flexible sealing ring; 206. Limiting ring; 2061. Groove; 2062. Protruding column; 2063. Positioning hole; 2064. Inclined surface; 2065. Slide groove; 207. Ball bearing; 2071. First elastic element; 208. Counterweight; 2081. Movable cavity; 2082. Second elastic element. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. Example 1

[0023] Reference Figures 1-3 This is the first embodiment of the present invention, which provides a bottom magnetic stirring rotor structure with low shear force.

[0024] Specifically, the power assembly 100 includes a drive motor 101 and a drive housing 102 located at the end of the drive motor 101. A drive shaft is provided at the center of the drive housing 102 and a protective sleeve 103 is provided on the outer wall of the drive shaft. The stirring assembly 200 includes an isolation cover 201. A column 2011 is provided at the end of the isolation cover 201. A rotating ring 202 is sleeved on the outer wall of the column 2011, and stirring blades 204 are arranged in an array on the outer wall of the rotating ring 202. A locking member is provided inside the rotating ring 202 for fixing the stirring blades 204. A rotating shell 203 is also sleeved on the outer wall of the isolation cover 201, and the rotating shell 203 is fixedly connected to the rotating ring 202 for driving the rotating ring 202 and the stirring blades 204 to rotate.

[0025] The protective sleeve 103 is fixed above the drive box 102 to protect the drive shaft and prevent it from directly contacting external parts or materials and causing wear. The drive shaft rotates inside the protective sleeve 103 under the influence of the drive motor 101. The external magnet at the top of the drive shaft affects the internal magnet located on the inner wall of the rotating shell 203, causing the rotating shell 203 to rotate outside the isolation cover 201.

[0026] The isolation cover 201 is fixed to the bottom of the tank to isolate the tank from the outside. The top of the drive shaft is inside the isolation cover 201 and is not directly connected to the isolation cover 201. The rotating ring 202 is fixedly connected to the rotating shell 203, and the two are a whole. The rotating shell 203 rotates outside the isolation cover 201 through magnetic coupling between the inner magnet inside and the outer magnet at the top of the drive shaft.

[0027] The rotating shell 203 is fixedly connected to the rotating ring 202. When the rotating shell 203 rotates, it will drive the rotating ring 202 to rotate together. The rotating ring 202 is sleeved on the outer wall of the column 2011 at the end of the isolation cover 201. Therefore, the rotating ring 202 rotates stably around the column 2011 as the axis.

[0028] The stirring blades 204 arranged in an array on the outer wall of the rotating ring 202 are fixed by a locking component inside the rotating ring 202. At the same time, the locking component allows the stirring blades 204 to be quickly replaced. When the rotating ring 202 rotates, the locking component fixes the stirring blades 204 and drives them to rotate synchronously. The rotating stirring blades 204 come into contact with the material to be stirred, thus completing the stirring operation of the material. Example 2

[0029] Reference Figures 3-6 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0030] Specifically, the inner wall of the rotating ring 202 has a cavity 2021 and the outer wall of the rotating ring 202 has an installation port 2022, and the inner wall of the installation port 2022 is provided with a flexible sealing ring 205.

[0031] The mounting ports 2022 array is located on the outer wall of the rotating ring 202 and is connected to the cavity 2021. The flexible sealing ring 205 is fixedly installed on the inner wall of the mounting ports 2022 and fits against the outer wall of the stirring blade 204.

[0032] Preferably, the engaging component is located inside the cavity 2021 and includes a limiting ring 206. The end face of the limiting ring 206 has a positioning hole 2063. The outer wall of the positioning hole 2063 also has a sliding groove 2065. The end face of the positioning hole 2063 also has an inclined surface 2064.

[0033] Among them, the limiting ring 206 is symmetrically installed inside the cavity 2021, the sliding groove 2065 is opened on the side of the positioning hole 2063 and is integral with the positioning hole 2063. At the same time, the inclined surface 2064 is opened on both sides of the positioning hole 2063, and the inclined surface 2064 facilitates the installation and disassembly of the stirring blade 204.

[0034] The inner wall of the cavity 2021 is arrayed with limiting grooves 2023. A ball 207 is provided inside the limiting groove 2023, and the end of the ball 207 extends into the groove 2061 opened at the end of the limiting ring 206. The inner wall of the limiting groove 2023 is also provided with a first elastic element 2071, which is used to push the ball 207.

[0035] One end of the first elastic element 2071 abuts against the inside of the limiting groove 2023, pushing the ball 207 at the other end, so that the ball 207 fits tightly against the groove 2061 at the end of the limiting ring 206, and at the same time, the ball 207 allows the limiting ring 206 to rotate in the cavity 2021.

[0036] The stirring blade 204 has a mounting post 2041 at its end, a pushing block 2042 at its end, and a slot 2043 on the inner wall of the pushing block 2042. The end of the stirring blade 204 extends to the inner wall of the mounting port 2022 and compresses the flexible sealing ring 205.

[0037] When the stirring blade 204 is installed, the outer wall of the stirring blade 204 presses against the flexible sealing ring 205, causing it to deform and fit tightly against the outer wall of the stirring blade 204. This is used to isolate the medium outside the installation port 2022 from the rotating ring 202, preventing it from entering the cavity 2021 inside the rotating ring 202.

[0038] During installation, the push block 2042 at the top of the mounting post 2041 contacts the inclined surface 2064 on the surface of the positioning hole 2063. When moving inward, the push block 2042 presses the inclined surface 2064, causing the limiting rings 206 at both ends to separate. At this time, when the limiting ring 206 moves, the ball bearing 207 presses the first elastic element 2071, causing it to be deformed into the limiting groove 2023. After the push block 2042 passes the limiting ring 206, the limiting ring 206 resets under the push of the first elastic element 2071 and is locked in the slot 2043 on the outer wall of the push block 2042 through the positioning hole 2063, thus fixing the stirring blade 204. When it needs to be removed, pull the stirring blade 204 backward. The push block 2042 and the inclined surface 2064 abut against each other, causing the limiting rings 206 at both ends to separate again. Then the mounting post 2041 can be removed from the rotating ring 202.

[0039] Preferably, the outer wall of the limiting ring 206 is provided with protruding posts 2062, the outer wall of the protruding posts 2062 is provided with a counterweight 208, the inner wall of the counterweight 208 is provided with a movable cavity 2081 for the protruding posts 2062 to move, and the outer wall of the counterweight 208 is also provided with a second elastic member 2082, the other end of the second elastic member 2082 is fixed to the inner wall of the cavity 2021.

[0040] Among them, the array of protruding pillars 2062 is fixed on the outer wall of the limiting ring 206. When the limiting ring 206 is pushed by the pushing block 2042 and the two ends separate at the same time, it moves in the movable cavity 2081 on the inner wall of the counterweight block 208. At the same time, the limiting rings 206 at both ends are kept moving synchronously by the counterweight block 208.

[0041] When the rotating ring 202 rotates, the counterweight 208 is displaced in the cavity 2021 under the action of centrifugal force. At the same time, the limiting ring 206 is moved synchronously through the protruding post 2062. When the limiting ring 206 moves, the positioning hole 2063 on the surface moves. The slot 2043 at the end of the mounting post 2041 enters the slide groove 2065 from the positioning hole 2063. Since the opening size of the slide groove 2065 is smaller than that of the positioning hole 2063 and the surface of the slide groove 2065 has no slope, the stirring blade 204 cannot be removed from the rotating ring 202 when the slot 2043 is in the slide groove 2065.

[0042] When rotation stops, the second elastic element 2082 pushes the counterweight 208 to reset, and the counterweight 208 drives the limiting ring 206 to reset. At this time, the contact position between the limiting ring 206 and the slot 2043 returns from the slide groove 2065 to the positioning hole 2063, and the stirring blade 204 can be taken out.

[0043] In summary, within the cavity 2021 of the inner wall of the rotating ring 202, the limiting rings 206 are symmetrically distributed. The first elastic element 2071 abuts against the inner wall of the limiting groove 2023, pushing the ball 207 into the groove 2061 of the limiting ring 206. The limiting ring 206 is in a stable position, the flexible sealing ring 205 on the inner wall of the mounting port 2022 is in a natural state, and the counterweight 208 maintains its initial position under the action of the second elastic element 2082.

[0044] The mounting post 2041 at the end of the stirring blade 204 is aligned with the mounting port 2022 of the rotating ring 202 and inserted. The mounting post 2041 drives the end push block 2042 to enter synchronously. During this process, the outer wall of the stirring blade 204 squeezes the flexible sealing ring 205 in the mounting port 2022, causing it to deform and tightly fit the outer wall of the stirring blade 204, thus isolating the medium flow between the mounting port 2022 and the cavity 2021.

[0045] As the push block 2042 continues to move inward, it contacts the inclined surface 2064 on the end face of the positioning hole 2063 of the limiting ring 206, and the inclined surface 2064 is squeezed to generate a lateral thrust, causing the limiting rings 206 at both ends to separate towards both sides of the cavity 2021. When the limiting rings 206 move, the groove 2061 squeezes the ball 207, and the ball 207 moves into the limiting groove 2023 and squeezes the first elastic element 2071, causing the first elastic element 2071 to deform.

[0046] When the push block 2042 completely passes through the limiting ring 206, the elastic force of the first elastic element 2071 is released, pushing the ball 207 back into the groove 2061. The ball 207 drives the limiting ring 206 back to the center, and the positioning hole 2063 of the limiting ring 206 aligns with the slot 2043 on the outer wall of the push block 2042. The positioning hole 2063 is engaged with the slot 2043, completing the fixation of the stirring blade 204. At the same time, during the separation and reset of the limiting ring 206, the protrusion 2062 on the outer wall moves synchronously in the movable cavity 2081 of the counterweight block 208, ensuring that the movement of the limiting rings 206 at both ends is synchronized.

[0047] The power component drives the rotating shell 203 to rotate, and the rotating shell 203 drives the rotating ring 202 to rotate synchronously. When the rotating ring 202 rotates, the counterweight 208 in the cavity 2021 is subjected to centrifugal force and moves to the outside of the cavity 2021, pulling the second elastic element 2071 to deform.

[0048] When the counterweight 208 moves, the movable cavity 2081 on the inner wall drives the protruding post 2062 to move synchronously. The protruding post 2062 drives the limiting ring 206 to move outward of the cavity 2021. During the displacement of the limiting ring 206, the positioning hole 2063 on its surface disengages from the slot 2043 of the mounting post 2041. The slot 2043 moves into the sliding groove 2065 of the limiting ring 206 as the limiting ring 206 moves. The opening size of the sliding groove 2065 is smaller than that of the positioning hole 2063, and the sliding groove 2065 has no inclined structure. The pushing block 2042 of the mounting post 2041 cannot disengage from the sliding groove 2065, and the stirring blade 204 is restricted on the rotating ring 202 and cannot be removed, thus preventing it from falling off during the stirring process.

[0049] When the rotating ring 202 stops rotating, the centrifugal force on the counterweight 208 disappears, the elastic force of the second elastic element 2082 is released, pushing the counterweight 208 back to the center of the cavity 2021. The counterweight 208 drives the protrusion 2062 to reset through the movable cavity 2081, and the protrusion 2062 drives the limiting ring 206 back to the initial position.

[0050] During the reset process of the limit ring 206, the slide groove 2065 disengages from the slot 2043 of the mounting post 2041, the slot 2043 realigns and enters the positioning hole 2063 of the limit ring 206, and the anti-fall-off lock is released.

[0051] Pulling the stirring blade 204 backward causes the mounting post 2041 and the pushing block 2042 to move outward simultaneously. The pushing block 2042 presses against the inclined surface 2064 of the end face of the positioning hole 2063, causing the two end limiting rings 206 to separate again towards both sides of the cavity 2021. The ball bearing 207 compresses and deforms the first elastic element 2071. Continuing to pull the stirring blade 204, the mounting post 2041 and the pushing block 2042 are removed from the mounting port 2022, and the disassembly of the stirring blade 204 is completed. During this process, the flexible sealing ring 205 detaches from the stirring blade 204 and returns to its natural state.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A low-shear-force bottom magnetic stirring rotor structure, characterized in that: include: The power assembly (100) includes a drive motor (101) and a drive housing (102) located at the end of the drive motor (101). A drive shaft is provided at the center of the drive housing (102) and a protective sleeve (103) is provided on the outer wall of the drive shaft. The stirring assembly (200) includes an isolation cover (201), a column (2011) is provided at the end of the isolation cover (201), a rotating ring (202) is sleeved on the outer wall of the column (2011), and stirring blades (204) are arranged in an array on the outer wall of the rotating ring (202). A locking member is provided inside the rotating ring (202) for fixing the stirring blades (204). A rotating shell (203) is also sleeved on the outer wall of the isolation cover (201), and the rotating shell (203) is fixedly connected to the rotating ring (202) for driving the rotating ring (202) and the stirring blades (204) to rotate.

2. The low-shear-force bottom magnetic stirring rotor structure as described in claim 1, characterized in that: The inner wall of the rotating ring (202) is provided with a cavity (2021) and the outer wall of the rotating ring (202) is provided with an installation port (2022). A flexible sealing ring (205) is provided on the inner wall of the installation port (2022).

3. The low-shear-force bottom magnetic stirring rotor structure as described in claim 2, characterized in that: The engaging component is located inside the cavity (2021) and includes a limiting ring (206), with a positioning hole (2063) on the end face of the limiting ring (206).

4. The low-shear-force bottom magnetic stirring rotor structure as described in claim 3, characterized in that: The outer wall of the positioning hole (2063) is also provided with a sliding groove (2065), and the end face of the positioning hole (2063) is also provided with an inclined surface (2064).

5. The low-shear-force bottom magnetic stirring rotor structure as described in claim 4, characterized in that: The cavity (2021) has a limiting groove (2023) arrayed on its inner wall. The limiting groove (2023) is provided with a ball (207) inside, and the end of the ball (207) extends into the groove (2061) opened at the end of the limiting ring (206).

6. The low-shear-force bottom magnetic stirring rotor structure as described in claim 5, characterized in that: The inner wall of the limiting groove (2023) is also provided with a first elastic element (2071), and the first elastic element (2071) is used to push the ball (207).

7. The low-shear-force bottom magnetic stirring rotor structure as described in claim 6, characterized in that: The stirring blade (204) is provided with a mounting post (2041) at its end, and a pushing block (2042) is provided at the end of the mounting post (2041), and a slot (2043) is provided on the inner wall of the pushing block (2042).

8. The low-shear-force bottom magnetic stirring rotor structure as described in claim 7, characterized in that: The end of the stirring blade (204) extends to the inner wall of the mounting port (2022) and compresses the flexible sealing ring (205).

9. The low-shear-force bottom magnetic stirring rotor structure as described in claim 8, characterized in that: The outer wall of the limiting ring (206) is provided with protruding posts (2062), and a counterweight (208) is installed on the outer wall of the protruding posts (2062). The inner wall of the counterweight (208) is provided with a movable cavity (2081) for the protruding posts (2062) to move.

10. The low-shear-force bottom magnetic stirring rotor structure as described in claim 9, characterized in that: The outer wall of the counterweight (208) is also provided with a second elastic element (2082), and the other end of the second elastic element (2082) is fixed to the inner wall of the cavity (2021).

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