Bearingless stirrer

Abstract

The invention relates to the technical field of stirring equipment, and discloses a bearingless stirrer, which comprises a rotor cup, a base, an outer cover, a stator core arranged in the base, and a stator winding arranged on the stator core, the rotor cup comprises a cup body with an upper opening, a rotating shaft arranged at the bottom of the cup body and magnetic steel, an inner cylinder movably connected with the rotating shaft is formed in the base, the outer cover is matched with the base to cover the cup body, and a stirring paddle extending into the cup body is arranged in the outer cover. Stirring is realized through rotation of the rotor cup relative to the fixed stirring paddle, so that a penetrating stirring shaft is not required to be arranged at the bottom of the cup body, the rotating shaft is movably connected with the base, a bearing is not required to be mounted, and a dynamic sealing requirement is not required, thereby fundamentally avoiding the risk of leakage of liquid in the cup body, reducing potential safety hazards such as short circuit of an electric appliance and the like; meanwhile, the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of mixing equipment, and particularly relates to a bearingless mixer. Background Art

[0002] In the field of household kitchen appliances, mixers have become common equipment for many families' daily cooking and beverage making due to their efficient and convenient material mixing function. Existing household mixers usually adopt a structural design in which a mixing shaft extends into the cup body for mixing. When working, the mixing shaft needs to be connected and cooperated with the bottom of the cup body, and then the mixing shaft is connected to a driving device (such as a motor). By driving the mixing shaft to rotate, the mixing blades on the mixing shaft drive the materials in the cup body to be mixed. To prevent liquid from overflowing from the connection during the mixing process, a dynamic sealing structure often needs to be set. However, this traditional design has obvious defects: First, after long-term use, the sealing parts of the dynamic sealing structure are prone to sealing failure due to wear, aging or deformation. The liquid may seep out along the gap between the mixing shaft and the cup body, not only polluting the kitchen countertop, but also potentially causing safety hazards such as electrical short circuits.

[0003] Second, most mixing shafts need to be connected to bearings, which not only requires designing special tooling equipment to complete the press-fitting of the bearings and the mixing shafts, resulting in complex and cumbersome assembly processes, but also problems such as rust and wear of the bearings during use affect the normal movement of the mixing shaft. When a failure occurs and the bearings need to be repaired and replaced, not only does the maintenance cost increase, but also the user experience of consumers is greatly reduced. Therefore, it is urgent to develop a bearingless mixer to solve the above technical problems. Summary of the Invention

[0004] In view of the above deficiencies of the prior art, the purpose of the present invention is to provide a bearingless mixer, aiming to avoid the risk of liquid leakage in the cup body and eliminate the technical problems caused by setting bearings.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A bearingless mixer includes a rotor cup, a base, an outer cover, a stator core arranged in the base, and a stator winding arranged on the stator core; the rotor cup includes a cup body with an upper opening, a rotating shaft and a magnetic steel arranged at the bottom of the cup body, an inner cylinder is formed in the base and is movably connected to the rotating shaft, the outer cover is cooperated with the base to cover the cup body, and a mixing paddle extending into the cup body is arranged in the outer cover.

[0006] As a further improvement of the above technical solution, the base further includes an outer cylinder and a flat ring connecting the outer cylinder and the inner cylinder. An installation cavity for installing the stator core and the stator winding is formed below the flat ring, and a positioning step pressed by the cup body is formed at the top of the inner cylinder.

[0007] As a further improvement of the above technical solution, an anti-wear coating is provided on the bottom surface of the cup body and / or the top surface of the positioning step, and an anti-wear coating is provided on the outer peripheral wall of the rotating shaft and / or the inner wall of the inner cylinder.

[0008] As a further improvement of the above technical solution, the outer cover includes a top cover and a cylinder body provided under the top cover, and the cylinder body is connected to the base through a locking structure.

[0009] As a further improvement of the above technical solution, the locking structure includes at least one L-shaped groove opened on the side surface of the base and a convex block provided on the outer wall of the cylinder body. The convex block sequentially enters the vertical groove section of the L-shaped groove and then rotates into the horizontal groove section of the L-shaped groove to achieve locking.

[0010] As a further improvement of the above technical solution, the stirring paddle includes a fixed shaft vertically fixed downward on the bottom surface of the top cover and paddle blades provided on the fixed shaft.

[0011] As a further improvement of the above technical solution, a sealing groove for embedding the cup rim of the cup body is opened on the bottom surface of the top cover.

[0012] As a further improvement of the above technical solution, the magnetic steel is potted and fixed at the bottom of the cup body and faces the stator core.

[0013] As a further improvement of the above technical solution, the bottom of the base is open, and a limiting bottom plate for restricting the rotating shaft from disengaging from the inner cylinder is installed at the bottom of the rotating shaft through screws. The limiting bottom plate covers the stator core and the stator winding from bottom to top.

[0014] Advantages of the present invention: Compared with the prior art, the bearingless mixer provided by the present invention has the following advantages: 1. Stirring is achieved by the rotation of the rotor cup relative to the fixed stirring paddle, so there is no need to provide a penetrating stirring shaft at the bottom of the cup body. The rotating shaft and the base form an assembly, without the need for dynamic sealing, fundamentally avoiding the risk of liquid leakage in the cup body, reducing potential safety hazards such as electrical short circuits, and at the same time extending the service life of the equipment.

[0015] 2. The inner wall of the cup body is smooth and flat, with less material residue; during cleaning, the cup body can be directly rinsed alone or thoroughly cleaned by simple wiping, effectively avoiding bacterial growth and improving the hygienic safety of food processing.

[0016] 3. The rotating shaft of the rotor cup is movably connected to the inner cylinder in the base, without the need to install bearings. On the one hand, it greatly simplifies the assembly process of the product, reduces the dependence on special tooling equipment, reduces the labor and material costs during the production process, and improves production efficiency. On the other hand, it eliminates bearing-related failure problems, reduces the product repair rate and maintenance costs, and consumers do not need to frequently face the failure repair of the mixer caused by bearing problems. Brief Description of the Drawings

[0017] Figure 1 This is a cross-sectional view of the bearingless mixer provided by the present invention.

[0018] Figure 2 This is a perspective view of the bearingless mixer provided by the present invention.

[0019] Figure 3 This is an exploded view of the bearingless mixer provided by the present invention Figure 1 .

[0020] Figure 4 This is an exploded view of the bearingless mixer provided by the present invention Figure 2 .

[0021] Figure 5 This is a schematic top view of the base.

[0022] Figure 6 This is a schematic bottom view of the base.

[0023] Explanation of Main Component Symbols: 1 - rotor cup, 11 - cup body, 12 - rotating shaft, 13 - magnetic steel, 2 - base, 21 - outer cylinder, 22 - inner cylinder, 23 - flat ring, 24 - positioning step, 25 - installation cavity, 3 - outer cover, 31 - top cover, 32 - cylinder body, 33 - sealing groove, 34 - handle, 5 - stator core, 6 - stirring paddle, 61 - fixed shaft, 62 - paddle blade, 71 - L-shaped groove, 72 - clamping projection, 81 - limiting bottom plate, 82 - screw. Detailed Embodiment

[0024] The present invention provides a bearingless mixer. To make the purpose, technical solution and effects of the present invention clearer and more definite, the following further details the present invention with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the protection scope of the present invention.

[0025] Please refer to Figures 1 to 3 , the present invention provides a bearingless mixer, including a rotor cup 1, a base 2, an outer cover 3, a stator core 5 arranged in the base 2, and a stator winding arranged on the stator core 5; the rotor cup 1 includes an open-top cup body 11, a rotating shaft 12 and a magnetic steel 13 arranged at the bottom of the cup body 11, an inner cylinder 22 is formed in the base 2 and is movably connected to the rotating shaft 12, the outer cover 3 cooperates with the base 2 to cover the cup body 11 and a stirring paddle 6 extending into the cup body 11 is arranged in the outer cover 3.

[0026] After the mixer is powered on, the stator winding in the base 2 is energized, and a rotating magnetic field is generated under the action of the stator core 5. The permanent magnet 13 provided at the bottom of the rotor cup 1 will be affected by the electromagnetic force under the influence of the rotating magnetic field, so that the entire rotor cup 1 rotates around the rotating shaft 12 under the circumferential limitation of the inner cylinder 22. Since the stirring paddle 6 in the rotor cup 1 is fixed to the outer cover 3 and extends into the cup body 11 and remains stationary, when the rotor cup 1 rotates, the materials in the cup body 11 will be under the action of centrifugal force, friction force and the blocking of the stirring paddle 6, generating complex flow and tumbling movements, realizing stirring effects such as crushing and mixing of the materials.

[0027] Compared with the design of traditional mixers where the stirring shaft extends into the cup body 11 and needs to be connected and cooperated with the bottom of the cup body 11, and relies on a sealing structure to prevent liquid overflow, the mixer provided by the present invention realizes stirring by the rotation of the rotor cup 1 relative to the fixed stirring paddle 6. Therefore, there is no need to set a penetrating stirring shaft at the bottom of the cup body 11. The rotating shaft 12 and the base 2 form an assembly, without the need for dynamic sealing, fundamentally avoiding the risk of liquid leakage in the cup body 11, reducing safety hazards such as electrical short circuits, and at the same time extending the service life of the equipment.

[0028] In addition, the inner wall of the cup body 11 is smooth and flat, with less material residue; during cleaning, the cup body 11 can be directly rinsed alone or thoroughly cleaned by simple wiping, effectively avoiding the breeding of bacteria and improving the hygienic safety of food processing.

[0029] Moreover, the rotating shaft 12 of the rotor cup 1 is movably connected to the inner cylinder 22 in the base 2, without the need to install bearings. On the one hand, it greatly simplifies the assembly process of the product, reduces the dependence on special tooling equipment, reduces the labor and material costs in the production process, and improves the production efficiency. On the other hand, it eliminates the bearing-related failure problems, reduces the product repair rate and maintenance costs, and consumers do not need to frequently face the failure repair of the mixer caused by bearing problems.

[0030] Compared with traditional mixers, the overall volume of the bearingless mixer provided by the present invention is significantly reduced, making it more convenient to store and use in environments with limited space such as kitchens, and even can be carried with you for outdoor use. The small body also makes handling and moving easier. Whether it is adjusting the daily use position or transferring between different scenarios, it can be easily completed, greatly enhancing the use convenience of the product and improving the user experience.

[0031] During the stirring process, the high-speed rotation of the rotor cup 1 will generate vibrations. The outer cover 3 protects the human hand from being injured by contacting the rotor cup 1. If the connection between the outer cover 3 and the base 2 is not stable, it may cause the outer cover 3 to loosen or even fall off, posing risks of material splashing or component collision. The outer cover 3 includes a top cover 31 and a cylinder 32 disposed under the top cover 31. The cylinder 32 is connected to the base 2 through a locking structure. The design of the locking structure in this technical solution can effectively fix the cylinder 32 and the base 2, enabling the outer cover 3 to form a closed protective space as a whole, preventing the outer cover 3 from loosening due to vibrations during stirring, and enhancing the safety of equipment operation. At the same time, the stable connection can also reduce the vibration transmission during the stirring process and lower the overall machine noise.

[0032] It is worth mentioning that the top cover 31 and the cylinder 32 of the outer cover 3 can be designed as a split body with a threaded connection method. Since the stirring paddle 6 is disposed inside the outer cover 3, the outer cover 3 is detachably connected to the base 2 through a locking structure. The user only needs to release the locking structure to remove the outer cover 3 as a whole. At this time, the stirring paddle 6 is synchronously detached from the cup body 11 along with the outer cover 3. Then, the top cover 31 of the outer cover 3 is screwed apart from the cylinder 32. In this way, the outer surface of the stirring paddle 6 and the inner surface of the cup body 11 are completely exposed, and there is no need to reach into a narrow space for cleaning. It can be thoroughly cleaned by direct rinsing or wiping, greatly reducing the cleaning difficulty, avoiding the residue of food scraps from breeding bacteria, and enhancing the food hygiene safety.

[0033] In one embodiment, the locking structure includes at least one L-shaped groove 71 opened on the side surface of the base 2 and a clamping protrusion 72 disposed on the outer wall of the cylinder 32. The clamping protrusion 72 enters the vertical groove section of the L-shaped groove 71 in sequence and then is screwed into the horizontal groove section of the L-shaped groove 71 to achieve locking. When the mixer is working, even with the vibrations and centrifugal forces generated by the high-speed rotation of the rotor cup 1, it is difficult for the clamping protrusion 72 to accidentally withdraw from the horizontal groove section of the L-shaped groove. Compared with ordinary snap or plug-in locking structures, this L-shaped groove locking structure can connect the cylinder 32 and the base 2 more firmly, effectively preventing the outer cover 3 from accidentally loosening or falling off during operation, and ensuring the safe and reliable operation of the stirring operation.

[0034] When the user installs the outer cover 3, they only need to align the clamping protrusion 72 on the outer wall of the cylinder 32 with the vertical groove section of the L-shaped groove on the side surface of the base 2 and insert it, and then gently rotate the cylinder 32 to complete the locking. When disassembling, just operate in the reverse direction. This operation method of insertion and rotation is simple and intuitive, without the need for tools. Even a user who uses it for the first time can quickly master it, greatly improving the usability of the mixer and saving the user's operation time and energy.

[0035] Of course, the locking structure can also be other snap connection methods.

[0036] Specifically, see Figure 4 and Figure 5As shown, the base 2 further includes an outer cylinder 21 and a flat ring 23 connecting the outer cylinder 21 and the inner cylinder 22. Below the flat ring 23, an installation cavity 25 for installing the stator core 5 and the stator winding is formed, that is, the installation cavity 25 tightly connected by the flat ring 23, the outer cylinder 21 and the inner cylinder 22 constructs a solid external protection barrier for the stator core 5 and the stator winding. The semi-closed structure design of the installation cavity 25 also greatly enhances the waterproof ability of the mixer. Even if liquid enters the base 2, it is difficult to penetrate into the stator core 5 and the stator winding, reducing safety hazards such as short circuits and electric leakage to a certain extent, and ensuring the personal safety of users and the normal operation of electrical equipment.

[0037] Further, a positioning step 24 pressed by the cup body 11 is formed at the top of the inner cylinder 22. When the mixer is working, the rotor cup 1 rotates at a high speed under the drive of electromagnetic force. The positioning step 24 can not only effectively limit the displacement of the rotor cup 1 in the vertical and radial directions, prevent the rotor cup 1 from shaking or shifting during rotation, and ensure a smooth and efficient mixing process; but also prevent the flat ring 23 and the inner cylinder 22 from directly contacting the bottom surface of the cup body 11 over a large area, resulting in excessive resistance and affecting the rotation of the rotor cup 1.

[0038] In this embodiment, the rotating shaft 12 and the inner cylinder 22 adopt a clearance fit. When the mixer is working, the rotor cup 1 is in a high-speed rotation state, and continuous friction will occur between the cup body 11 and the positioning step 24, as well as between the rotating shaft 12 and the inner wall of the inner cylinder 22. Therefore, an anti-wear coating is provided on the bottom surface of the cup body 11 and / or the top surface of the positioning step 24, and an anti-wear coating is provided on the outer peripheral wall of the rotating shaft 12 and / or the inner wall of the inner cylinder 22. The presence of the anti-wear coating effectively reduces the friction loss between components, making the rotor cup 1 rotate more smoothly during the rotation process. Reducing the vibration and noise generated by friction, improving the stability and quietness of the mixer during operation. Compared with the structure without an anti-wear coating, this design can greatly extend the service life of key components such as the rotor cup 1 and the base 2, reduce the frequency of replacement and repair due to component wear, lower the maintenance cost of the product, and provide a more long-term and stable use experience for users.

[0039] The anti-wear coating preferably adopts a graphite coating. The graphite coating has a low friction coefficient and self-lubricating properties. The layered structure of graphite makes it easy to slide between layers, and the friction coefficient is extremely low (usually 0.05 - 0.15), which can significantly reduce the direct contact and wear of the friction surface; graphite will form a solid lubricating film during the friction process, filling the surface micro-concavities and convexities, isolating the friction pair, thereby reducing wear. If the rotor cup 1 may face a high-temperature environment during operation, the graphite coating has good high-temperature resistance and can maintain its lubricating and wear-resistant properties at a higher temperature, ensuring the normal operation of the rotor cup 1.

[0040] In practical applications, a graphite coating is continuously formed on the outer peripheral wall of the rotating shaft 12 of the rotor cup 1 and the contact part between the bottom surface of the cup body 11 and the positioning step 24 through related processes such as spraying and vapor deposition, which facilitates processing.

[0041] Specifically, as shown in Figure 1 The stirring paddle 6 includes a fixed shaft 61 vertically and downwardly fixed to the bottom surface of the top cover 31 and a paddle blade 62 provided on the fixed shaft 61. When the rotor cup 1 rotates at a high speed, the material flows towards the edge of the cup body 11 due to centrifugal force, while the paddle blade 62 on the fixed shaft 61 generates a radial shear force (the paddle blade 62 cuts the rotating material flow) and an axial guiding force (the inclination angle or curved surface design of the paddle blade 62 can drive the material to circulate up and down) on the material in the central area, forcing the edge material to flow back to the center, forming a three-dimensional flow field, avoiding material stratification or local accumulation, and significantly improving the stirring uniformity.

[0042] In this embodiment, the paddle blade 62 is of a spiral structure and is provided with a blade edge. During the rotation of the rotor cup 1, by virtue of the propulsion of the spiral surface, the material can be continuously conveyed from the upper part of the cup body 11 to the bottom, forming a continuous material circulation flow field. At the same time, the sharp edge of the blade can strongly cut and stir the material. Compared with the ordinary paddle blade 62, it can break hard ingredients such as ice cubes and nuts, as well as fruits and vegetables with rich fibers more quickly. The two work together synergistically, greatly shortening the stirring time and improving the stirring efficiency, enabling the blender to make delicate and smooth smoothies, fruit juices and other beverages or dishes in a short time.

[0043] When disassembling and assembling the traditional outer cover 3, the user needs to grasp the side wall of the outer cover 3 with the palm or fingers to apply force. The side wall surface is smooth and is prone to slipping when the hands are wet or greasy, making the operation laborious. Therefore, a handle 34 is provided on the top of the top cover 31.

[0044] In addition, the setting of the handle 34 provides a hanging fulcrum for the outer cover 3. The user can hang the handle 34 on a kitchen hook or a draining rack, so that the outer cover 3 is vertically suspended, and the water on the stirring paddle 6, the inner wall of the top cover 31 and the inner wall of the cylinder body 32 can naturally flow down and dry, avoiding water accumulation and residue.

[0045] Preferably, a sealing groove 33 for embedding the cup rim of the cup body 11 is formed on the bottom surface of the top cover 31, but the cup rim of the cup body 11 will not come into contact with the sealing groove 33 to cause friction. To a certain extent, the sealing groove 33 blocks the material in the cup from overflowing from the cup mouth, causing pollution and waste.

[0046] As a preferred embodiment, the magnet 13 is potted and fixed at the bottom of the cup body 11 and faces the stator core 5. The magnet 13 is fixed at the bottom of the cup body 11 by potting process and faces the stator core 5. The potting material (such as epoxy resin, etc.) can form a seamless sealing layer at the connection between the magnet 13 and the bottom of the cup body 11, effectively blocking the infiltration of liquid (such as the juice of the stirred ingredients, the moisture during cleaning, etc.) from the gap at the bottom of the cup body 11.

[0047] As a preferred embodiment, the stator core 5 and the stator winding are arranged around the inner cylinder 22 and potted and fixed in the installation cavity 25. The potting material fills the gaps between the windings to form an integral insulating layer, preventing liquid intrusion from causing winding short - circuit and extending the service life of the motor; it can achieve a high - level waterproof ability for the whole mixer.

[0048] As a preferred embodiment, the bottom of the base 2 is open. The design of the open bottom of the base 2 makes the installation and disassembly process of the stator core 5 and the stator winding more intuitive and easy to operate.

[0049] In order to effectively limit the axial displacement of the rotating shaft 12 and prevent it from detaching from the inner cylinder 22; a limit bottom plate 81 is installed at the bottom of the rotating shaft 12 through a screw 82.

[0050] It should be noted that the limit bottom plate 81 also covers the stator core 5 and the stator winding from bottom to top. It provides additional physical protection for the stator assembly. During use, it can block external liquids, dust and other impurities from entering the inside of the base 2, providing a good protection environment for the internal electrical components; this helps to avoid the entry of dust, water vapor or other impurities into the stator components, preventing problems such as electrical short - circuit and deterioration of insulation performance.

[0051] The assembly process of the bearingless mixer provided by the present invention is as follows: the stator core 5 and the stator winding are embedded around and into the installation cavity 25 of the base 2 and fixed by potting process (such as epoxy resin) to form an integral insulating layer, filling and sealing the winding gaps; the rotor cup 1 is pre - encapsulated with the magnet 13 and coated with an anti - wear coating. The rotating shaft 12 is inserted into the inner cylinder 22 from top to bottom. At this time, the bottom of the cup body 11 will press against the positioning step 24 to ensure that the magnet 13 faces the stator core 5; the limit bottom plate 81 is installed at the bottom of the rotating shaft 12 through a screw 82. Finally, the stirring paddle 6 is inserted into the cup body 11, and the outer cover 3 covers the cup body 11 and is locked with the base 2.

[0052] Compared with the bearing mixer, which needs to assemble bearings (such as ball bearings, sliding bearings, etc.), bearing seats, sealing rings, grease and other components, the assembly process requires the completion of multiple processes such as bearing positioning, axial fixation, and sealing treatment. The bearingless mixer design directly eliminates the bearing assembly, and the shaft 12 is directly movably connected to the inner cylinder 22 of the base 2. Only basic steps such as inserting the rotor cup 1 and installing the limit bottom plate 81 need to be completed, which greatly shortens the assembly time.

[0053] The installation of bearings requires precise control of parameters such as axial clearance and radial runout, and often relies on special tooling (such as bearing presses) to ensure coaxiality. The operation is difficult and can easily cause abnormal noise or jamming due to assembly errors. The bearingless mixer design eliminates the need for bearing positioning and debugging through direct fit between the inner cylinder 22 and the shaft 12 (the fit clearance can be controlled through machining accuracy), allowing ordinary workers to quickly complete assembly and reduce dependence on skilled workers.

[0054] Mixers with bearings need to lubricate the bearings (apply grease) during assembly, and set up sealing rings to prevent grease leakage or liquid infiltration. The process is cumbersome and there is a risk of grease contamination (such as grease mixed with food). The bearingless mixer design completely eliminates the lubrication and sealing steps, avoiding additional costs such as grease procurement, storage, and application, while eliminating the hidden dangers of oil leakage or material leakage caused by seal failure, which is more in line with food-grade hygiene requirements.

[0055] Bearing installation requires the purchase of special equipment and regular maintenance of equipment accuracy; the bearingless design only requires basic assembly tools (such as screwdrivers), which can greatly reduce the company's fixed asset investment in tooling equipment, and is especially suitable for small and medium-sized production lines or flexible production scenarios.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0057] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows for mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solutions and inventive concepts of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A bearingless mixer, characterized in that, It includes a rotor cup, a base, an outer cover, a stator core disposed within the base, and a stator winding disposed on the stator core; the rotor cup includes a cup body with an upper opening, a rotating shaft and a permanent magnet disposed at the bottom of the cup body, an inner cylinder is formed within the base and is movably connected to the rotating shaft, the outer cover is fitted with the base to cover the cup body and a stirring paddle extending into the cup body is provided within the outer cover.

2. The bearingless mixer according to claim 1, wherein The base further includes an outer cylinder and a flat ring connecting the outer cylinder and the inner cylinder, an installation cavity for installing the stator core and the stator winding is formed below the flat ring, and a positioning step pressed by the cup body is formed at the top of the inner cylinder.

3. The bearingless mixer according to claim 2, characterized in that, An anti-wear coating is provided on the bottom surface of the cup body and / or the top surface of the positioning step, and an anti-wear coating is provided on the outer peripheral wall of the rotating shaft and / or the inner wall of the inner cylinder.

4. The bearingless mixer according to claim 1, wherein, The outer cover includes a top cover and a cylinder body disposed under the top cover, and the cylinder body is connected to the base through a locking structure.

5. The bearingless mixer according to claim 4, characterized in that, The locking structure includes at least one L-shaped groove opened on the side surface of the base and a clamping protrusion disposed on the outer wall of the cylinder body, and the clamping protrusion enters the vertical groove section of the L-shaped groove in sequence and then screws into the horizontal groove section of the L-shaped groove to achieve locking.

6. The bearingless mixer according to claim 4, characterized in that The stirring paddle includes a fixed shaft vertically and downwardly fixed to the bottom surface of the top cover and paddle blades disposed on the fixed shaft.

7. The bearingless mixer according to claim 6, wherein, The paddle blades are of a spiral structure and are provided with cutting edges.

8. The bearingless mixer according to claim 4, wherein A sealing groove for embedding the cup rim of the cup body is opened on the bottom surface of the top cover.

9. The bearingless mixer according to claim 1, wherein The permanent magnet is potted and fixed at the bottom of the cup body and faces the stator core.

10. The bearingless mixer according to claim 1, characterized in that, The bottom of the base is open, a limiting bottom plate for restricting the rotating shaft from disengaging from the inner cylinder is installed at the bottom of the rotating shaft through screws, and the limiting bottom plate covers the stator core and the stator winding from bottom to top.

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