Magnetic coupling spin-off efficient gas-liquid reactor

Abstract

The invention aims to provide a magnetic coupling spin-off efficient gas-liquid reactor, which belongs to the technical field of gas-liquid mass transfer equipment, and comprises a reaction tank body, the top of the reaction tank body is provided with a liquid inlet pipe and a gas outlet pipe, the bottom of the reaction tank body is provided with a liquid outlet pipe, and the side wall of the reaction tank body is provided with a gas inlet. A rotor assembly coaxial with the reaction tank body is arranged in the reaction tank body, an annular gas inlet bin is arranged on the periphery of the rotor assembly, the gas inlet is communicated with the annular gas inlet bin, and a magnet driving assembly is arranged at the bottom of the rotor assembly. The magnetic coupling spin-off efficient gas-liquid reactor can solve the problems of insufficient gas-liquid contact, liquid foam entrainment, low reaction efficiency and the like.

Description

Technical Field

[0001] This invention belongs to the technical field of gas-liquid mass transfer equipment, specifically relating to a magnetically coupled vortex high-efficiency gas-liquid reactor. Background Technology

[0002] A centrifugal reactor is a novel device that utilizes the centrifugal force field generated by rotation to enhance gas-liquid mass transfer and reaction processes. Under centrifugal force, the liquid is sheared into micron- or even nanometer-sized liquid films, filaments, or droplets, thereby greatly increasing the contact area between the gas and liquid phases and significantly improving mass transfer efficiency and reaction rate. Compared with traditional gas-liquid contact equipment such as bubble columns and packed columns, it has advantages such as small size, high efficiency, controllable residence time, and ease of scale-up, and is widely used in chemical engineering, environmental protection, bioengineering, and nanomaterial preparation.

[0003] Existing vortex reactors typically consist of a fixed outer shell and an internally rotating rotor (or rotating packed bed). Gas and liquid are usually introduced axially or radially, respectively, and come into close contact inside or on the surface of the rotor. However, the existing technology still has some shortcomings: 1. Uneven initial gas-liquid distribution: Traditional gas inlet structures are simple, and the gas distribution is not uniform when entering the reaction zone, which can easily lead to flow deviation or short circuit, affecting the overall mass transfer efficiency.

[0004] 2. Poor liquid atomization and distribution: If the liquid feeding system is not designed properly, it may fail to fully atomize the liquid or form a uniform film, resulting in excessively thick liquid films in some areas and increased mass transfer resistance.

[0005] 3. Limitations of rotor drive method: Many devices use mechanical shafts to directly drive rotors, which presents dynamic sealing problems, easily leading to media leakage. Furthermore, mechanical wear is severe at high speeds, resulting in high maintenance costs and limiting their application in corrosive or hazardous media.

[0006] 4. Complex internal structure and high energy consumption: Some designs use complex internal components in pursuit of high efficiency, which increases fluid resistance and rotational load, resulting in increased energy consumption.

[0007] 5. Severe liquid entrainment: Tiny droplets generated under high-speed rotation are easily carried out by the airflow, causing material loss and burdening subsequent separation.

[0008] Therefore, there is an urgent need in this field to develop a new type of vortex reactor that can optimize gas-liquid distribution, simplify the driving structure, reduce energy consumption and reduce liquid entrainment while ensuring efficient mass transfer, so as to meet the needs of a wider range of industrial applications. Summary of the Invention

[0009] The purpose of this invention is to provide a magnetically coupled swirl-dissociated high-efficiency gas-liquid reactor, which can achieve contactless magnetic drive, precise gas-liquid two-phase distribution and pre-structuring, and efficient mass transfer.

[0010] The present invention adopts the following technical solution: A magnetically coupled vortex high-efficiency gas-liquid reactor includes a reaction vessel. The top of the reaction vessel is provided with a liquid inlet pipe and a gas outlet pipe, and the bottom is provided with a liquid outlet pipe. The side wall of the reaction vessel is provided with a gas inlet. The reaction vessel is provided with a rotor assembly coaxially arranged with the reaction vessel. The rotor assembly is provided with an annular air inlet chamber around its perimeter. The gas inlet is connected to the annular air inlet chamber. The bottom of the rotor assembly is provided with a magnet drive assembly.

[0011] Furthermore, the inner wall of the reaction vessel is coated with a ceramic anti-corrosion coating with a thickness of 3 mm.

[0012] Furthermore, there are four gas inlets, which are evenly distributed around the reaction vessel. The gas inlet is equipped with a flow control valve at the outer end of the reaction vessel and an outwardly expanding conical end at the inner end of the reaction vessel, which is equipped with a stainless steel circular plate. The size of the circular plate is the same as that of the outwardly expanding conical end, and several openings with a diameter of 5mm are evenly provided on the circular plate.

[0013] Furthermore, the height of the annular air intake chamber is the same as the height of the rotor assembly. The annular air intake chamber is divided into four cavities by four baffles. A serrated baffle is installed at the entrance of each cavity. The gas inlet is located on the outside of the annular air intake chamber. A circular hole is provided on the inside of the annular air intake chamber at the position corresponding to the gas inlet. A metal mesh plate is provided on the circular hole. The end of the circular hole is provided with a converging conical airflow outlet and connected to a downwardly inclined ceramic nozzle.

[0014] Furthermore, each of the four cavities of the annular air intake chamber is provided with two stainless steel conical protrusions.

[0015] Furthermore, the distance between the inner side of the annular air intake chamber and the outer side of the rotor assembly is 1 cm.

[0016] Furthermore, the nozzle is tilted downward at an angle of 45°, and a protective cover made of stainless steel is provided on the outside of the nozzle.

[0017] Furthermore, the liquid inlet pipe is a single-cavity closed pipe made of stainless steel corrosion-resistant material. A cylindrical magnet is provided in the top 1 / 3 section of the liquid inlet pipe, and a magnet with the opposite magnetic pole to magnet one is provided on the outer side of the liquid inlet pipe. A conveyor belt for moving magnet two up and down is connected to one side of magnet two. The length of the conveyor belt is 1 / 3 of the length of the liquid inlet pipe. A 15° inclined contraction section with a filter screen is provided in the top 1 / 3 section of the liquid inlet pipe. Three perforated circular plates with a thickness of 2mm are provided below the filter screen. The openings on the three perforated circular plates gradually decrease from top to bottom, and the openings of adjacent perforated circular plates are staggered. The liquid inlet pipe has a 15° inclined outward expansion section below the perforated circular plates, which is connected to the wall of the liquid inlet pipe. A spiral liquid guide groove is provided at the bottom of the liquid inlet pipe. A raised conical disc with the same inner diameter as the liquid inlet pipe and a circular metal crushing mesh are arranged in sequence at the bottom of the spiral liquid guide groove.

[0018] Furthermore, the gas outlet pipe is sleeved on the outside of the liquid inlet pipe and welded to the liquid inlet pipe. The bottom of the gas outlet pipe is provided with a gas inlet that expands outward by 40°. The inner wall of the gas inlet is provided with five annular grooves, and a screen is provided in the annular grooves. The side wall of the gas outlet pipe is provided with a horizontal pipe, and three arc-shaped fan blades are provided in the horizontal pipe. The arc-shaped fan blades are evenly distributed at 120° and form a 45° angle with the airflow direction.

[0019] Furthermore, the end of the liquid outlet pipe is a converging conical liquid guide port at a 30° angle, and is connected to a waste liquid tank via a flexible hose.

[0020] Furthermore, the center of the rotor assembly is connected to the reaction vessel via a support shaft. The support shaft forms an annular frame by connecting with radial spokes. Eight baffles are evenly arranged inside the rotor assembly along the support shaft. The sidewalls of the baffles are provided with spiral guide grooves opposite to the rotation direction of the rotor assembly. A positioning boss is provided at the center edge of the annular frame. One end of the baffle is connected to the positioning boss by bolts. The hollow part of the rotor assembly is filled with filler.

[0021] Furthermore, the magnet drive assembly includes a first magnet disk, a second magnet disk, a magnet disk gear, a drive motor gear, and a drive motor. The first magnet disk is located at the bottom of the rotor assembly, and the second magnet disk is located at the bottom of the reaction vessel. Both the first and second magnet disks consist of sixteen arc-shaped magnets arranged on a disc-shaped frame with alternating N and S poles. The magnetic poles of the first and second magnet disks are staggered and correspond one-to-one. The center of the second magnet disk has a circular hole, and a rotating shaft is installed inside the circular hole. The magnet disk gear is fitted on the rotating shaft. The drive motor is fixed to a metal base plate by bolts. The output shaft of the drive motor is parallel to the rotating shaft. The output shaft of the drive motor is equipped with a drive motor gear, which meshes with the drive motor gear. The second magnet disk is fixed by rolling bearings.

[0022] The beneficial effects of this invention are as follows: 1. The optimized gas nozzle and liquid disruption system of this invention combine to achieve thorough mixing of gas and liquid within the rotor zone at an extremely fine scale and with a large specific surface area. The reverse spiral baffles inside the rotor further enhance liquid film surface renewal. The annular air inlet chamber and multi-layer sieve-plate liquid distributor ensure that the gas and liquid are fully homogenized before entering the core reaction zone, avoiding the uneven distribution problems commonly found in traditional equipment.

[0023] 2. This invention uses magnetic coupling drive to achieve contactless power transmission, solves the dynamic sealing problem of the rotating shaft, and significantly improves the safety and reliability of the equipment when handling special media.

[0024] 3. The gas and liquid circuit design of this invention focuses on reducing flow resistance, and the rotor structure enhances mass transfer without excessively increasing the rotational load. Magnetic drive transmission has high efficiency and low mechanical loss.

[0025] 4. The unique gas outlet design of this invention can effectively separate and recover liquid droplets entrained in the gas flow, reducing material loss and burden on subsequent processes. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the liquid inlet pipe. Figure 3 This is a schematic diagram of the annular air intake chamber. Figure 4 This is a schematic diagram of the nozzle structure; Figure 5 This is a schematic diagram of the gas outlet pipe. Figure 6 This is a schematic diagram of the structure of a magnetically coupled magnet disk; Figure 7 This is a schematic diagram of the structure of the magnetic disk gear and the drive motor gear; Figure 8 This is a schematic diagram of the rotor assembly. Figure 9 This is a schematic diagram of the baffle structure; Figure 10 A schematic diagram of the sawtooth baffle structure; Wherein: 1-Liquid inlet pipe; 2-Gas outlet pipe; 3-Reaction tank; 4-Annular gas inlet chamber; 5-Gas inlet; 6-Rotor assembly; 7-Liquid outlet pipe; 8-Support shaft; 9-Magnet drive assembly; 10-Rolling bearing; 11-Magnet disc gear; 12-Drive motor; 13-Positioning boss; 14-Drive motor gear; 15-Magnet 1; 16-Conveyor belt; 17-Filter screen; 18-3mm aperture circular plate; 19-2mm aperture circular plate; 20-1mm aperture... 21-Circular plate; 22-Spiral liquid guide groove; 23-Protruding conical disc; 24-Metal crushing mesh; 25-Flow control valve; 26-Circular plate; 27-Conical protrusion; 28-Baffle one; 29-Metal mesh plate; 30-Nozzle; 31-Protective cover; 32-Arched fan blade; 33-Annular groove; 34-Gas inlet; 35-Magnetic disc one; 36-Magnetic disc two; 37-Baffle two; 38-Spiral guide groove; 39-Bolt; 40-Serrated baffle. Detailed Implementation

[0027] The invention will be further described with reference to the accompanying drawings.

[0028] As shown in the figure, a magnetically coupled vortex high-efficiency gas-liquid reactor includes a reaction vessel 3. The top of the reaction vessel 3 is provided with a liquid inlet pipe 1 and a gas outlet pipe 2, and the bottom is provided with a liquid outlet pipe 7. The side wall of the reaction vessel is provided with a gas inlet 5. The reaction vessel 3 is provided with a rotor assembly 6 coaxially arranged with the reaction vessel 1. The rotor assembly 6 is provided with an annular air inlet chamber 4 around its perimeter. The gas inlet 5 is connected to the annular air inlet chamber 4. The bottom of the rotor assembly 6 is provided with a magnet drive assembly 9.

[0029] The inner wall of the reaction vessel 3 is coated with a ceramic anti-corrosion coating with a thickness of 3mm.

[0030] The gas inlet 5 is located around the reaction vessel 3, with 4 evenly distributed inlets. The front end of the gas inlet 5 is equipped with a flow control valve 24, and the rear end is welded with an outwardly expanding conical inlet. The end of the inlet is equipped with a stainless steel circular plate 25, the size of which coincides with the size of the inlet. Small holes with a diameter of 5mm are evenly opened on the circular plate 25.

[0031] The annular air intake chamber 4 is located around the rotor assembly 6, at the same height as the rotor assembly 6. Inside, four radial baffles 27 are evenly arranged, dividing the chamber into four cavities. A serrated baffle 40 is installed at the entrance of each cavity. The outer side of the annular air intake chamber 4 is connected to the gas inlet 5, which is located at the center of the outer side. A circular hole is opened on the upper side of the inner side corresponding to the gas inlet 5, and a metal mesh plate 28 of the same size is attached. The end has a converging conical airflow outlet connected to a downward-sloping ceramic nozzle 29. Two conical protrusions 26, made of stainless steel, are evenly added inside each cavity. The inner side of the annular air intake chamber 4 is 1 cm away from the outer side of the rotor assembly 6.

[0032] The nozzle 29 installed at the end of the airflow outlet 2 is tilted downward at 45°, and a stainless steel protective cover 30 is installed on the outside of the nozzle 29. The nozzle 29 is made of ceramic material.

[0033] The liquid inlet pipe 1 is made of stainless steel with corrosion resistance and is a single-lumen closed pipe. A cylindrical magnet 15 is installed in the first third of the liquid inlet pipe 1, and a magnet 2 with different magnetic properties is installed at the corresponding position on the outside. The two are magnetically attracted to the side wall of the liquid inlet pipe 1. The outer magnet 2 is connected to a conveyor belt 16 for moving the magnet 2 up and down. The length of the conveyor belt 16 is the same as the first third of the liquid inlet pipe 1. A 15° inclined constriction section is provided at the first third of the liquid inlet pipe 1, where a filter screen 17 is installed. Three 2mm thick perforated circular plates are installed at the lower end of the filter screen 17. The holes in each layer of the circular plates are evenly distributed in a ring, with the hole diameter gradually decreasing. From top to bottom, the layers are: first layer 3mm diameter circular plate 18, second layer 2mm diameter circular plate 19, and third layer 1mm diameter circular plate 20, with the holes of adjacent circular plates staggered. A 15° inclined outward expansion section is then provided and connected to the wall of the liquid inlet pipe 1. The inner wall of the liquid inlet pipe 1 is provided with a spiral liquid guiding groove 21. At the bottom of the spiral liquid guiding groove 21, there are a raised conical disc 22 with the same inner diameter as the liquid inlet pipe 1 and a circular metal crushing mesh 23.

[0034] The gas outlet pipe 2 is wrapped around the outside of the liquid inlet pipe 1 and welded in place. The front end of the gas outlet pipe is set as a gas inlet 33 with an outward expansion of 40°. Five annular grooves 32 are provided on the inner wall of the gas inlet 33. The depth of the annular grooves 32 is 1cm. A thin screen is installed in the annular grooves 32. The side wall of the gas outlet pipe 2 is provided with a horizontal pipe with an arc-shaped chamfer. Three arc-shaped fan blades 31 are welded to the horizontal pipe 5cm away from the arc-shaped chamfer. They are evenly distributed at 120° inside the horizontal pipe and form a 45° angle with the airflow direction.

[0035] The end of the liquid outlet pipe 7 is a converging conical liquid guiding section with an angle of 30°, which is connected to the waste liquid tank through a hose.

[0036] The rotor assembly 6 is fixed to the reaction vessel 3 by a support shaft 8 at its center. The support shaft 8 forms an annular frame by connecting with radial spokes. Eight baffles 36 are evenly installed inside the rotor assembly 6 along the support shaft 8. The sidewalls of the baffles 36 are provided with spiral guide grooves 37, the spiral direction is opposite to the rotation direction of the rotor assembly 6, and the groove depth is 3mm. The baffles 36 are fixed to the positioning bosses 13 of the annular frame by bolts 38. The inlet and outlet edges are rounded, and the remaining hollow parts are filled with filler.

[0037] The magnet drive assembly includes a magnet disk 34 at the bottom of the rotor assembly 6, a magnet disk 35 at the bottom of the reaction vessel 3, a rotating shaft 39, a magnet disk gear 11, a drive motor gear 14, and a drive motor 12. Both magnet disks 34 and 35 consist of 16 arc-shaped magnets arranged on a disc-shaped frame with alternating N and S poles. The magnetic poles of magnet disks 34 and 35 are misaligned and correspond one-to-one. A circular hole is left in the center of the second magnetic disk 35, and a metal shaft 39 is welded on it. The length of the shaft 39 is 5cm longer than the thickness of the second magnetic disk 35. A magnetic disk gear 11 is fitted onto the protruding side of the shaft 39. A set screw passes through the side of the magnetic disk gear 11 to fix the shaft 39 and the magnetic disk gear 11. The drive motor 12 is fixed to the metal base plate with screws. The position of the drive motor 12 is aligned with the magnetic disk gear 11. The shaft of the drive motor is parallel to the shaft 39. A drive motor gear 14 is fixed on the shaft of the drive motor 12. The teeth of the magnetic disk gear 11 and the drive motor gear 14 are interlocked. A rolling bearing 10 is added to the second magnetic disk 35 for fixation.

[0038] The working principle of this invention is as follows: When the operator needs to use the magnetically coupled vortex high-efficiency gas-liquid reactor, the drive motor 12 is first turned on to accelerate the rotor assembly 6 to the set speed. The absorbent is pumped into the liquid inlet pipe. The liquid undergoes magnetic disturbance, contraction acceleration, three-stage sieve shearing, spiral guidance, and metal mesh crushing, and finally sprays from the central area of ​​the rotor assembly 6 into the high-speed rotating interior of the rotor assembly 6 in the form of highly dispersed mist and fine liquid jets. Exhaust gas is introduced from the four gas inlets 5, and after being regulated by the flow control valve 24, it enters the four chambers of the annular air intake chamber 4. After buffering and equalization, the airflow is injected into the rotor assembly 6 at a high speed at a 45° angle through the nozzle 29. Inside the rotor assembly 6, the liquid is thrown towards the annular skeleton by the strong centrifugal force, and when flowing through the baffle 36 with the reverse spiral groove, it is violently sheared and stretched into an extremely thin liquid film or micro-droplets. At the same time, the tangentially injected gas and liquid come into counter-current contact in the rotor assembly 6 area, resulting in highly efficient mass transfer and chemical reaction. The huge shear force and rapidly renewing surface make the mass transfer efficiency extremely high.

[0039] After the reaction is complete, the waste liquid is thrown against the tank wall, flows down the conical liquid guide section, and is discharged from the bottom liquid outlet pipe 7. The purified gas rises and, as it passes through the guide cone structure and multiple screens of the gas outlet pipe 2, the entrained liquid droplets are captured, condensed, and refluxed, while the dry gas is discharged through the horizontal straight pipe.

Claims

1. A magnetically coupled spin-off high efficiency gas-liquid reactor characterized by: The reaction vessel includes a reaction vessel (3), which has a liquid inlet pipe (1) and a gas outlet pipe (2) at the top and a liquid outlet pipe (7) at the bottom. The side wall of the reaction vessel has a gas inlet (5). The reaction vessel (1) has a rotor assembly (6) coaxially arranged with the reaction vessel (1). The rotor assembly (6) has an annular air intake chamber (4) around it. The gas inlet (5) is connected to the annular air intake chamber (4). The bottom of the rotor assembly (6) has a magnet drive assembly (9).

2. The magnetically coupled vortex high-efficiency gas-liquid reactor according to claim 1, characterized in that: The inner wall of the reaction vessel (3) is coated with a ceramic anti-corrosion coating with a thickness of 3 mm.

3. The magnetically coupled vortex high-efficiency gas-liquid reactor according to claim 1, characterized in that: There are four gas inlets (5), which are evenly distributed around the reaction tank (3). One end of the gas inlet (5) located outside the reaction tank (1) is equipped with a flow control valve (24), and the other end located inside the reaction tank (3) is an outwardly expanding conical end, and is equipped with a stainless steel circular plate (25). The size of the circular plate (25) is the same as the size of the outwardly expanding conical end, and the circular plate (25) is evenly provided with several openings with a diameter of 5mm.

4. The magnetically coupled vortex high-efficiency gas-liquid reactor according to claim 1, characterized in that: The height of the annular air intake chamber (4) is the same as the height of the rotor assembly (3). The annular air intake chamber (4) is divided into four cavities by four baffles (27). A serrated baffle (40) is installed at the entrance of the cavity. The gas inlet (5) is located on the outside of the annular air intake chamber (4). A circular hole is provided on the inner side of the annular air intake chamber (4) at the position corresponding to the gas inlet (5). A metal mesh plate (28) is provided on the circular hole. A converging conical airflow outlet is provided at the end of the circular hole and connected to a downwardly inclined ceramic nozzle (29). The annular air intake chamber (4) has two stainless steel conical protrusions (26) in each of its four cavities. The distance between the inner side of the annular air intake chamber (4) and the outer side of the rotor assembly (6) is 1 cm; The nozzle (29) is tilted downward at an angle of 45°, and a stainless steel protective cover (30) is provided on the outside of the nozzle (29).

5. The magnetically coupled vortex high-efficiency gas-liquid reactor according to claim 1, characterized in that: The liquid inlet pipe (1) is a single-cavity closed pipe made of stainless steel corrosion-resistant material. A cylindrical magnet (15) is provided in the top 1 / 3 section of the liquid inlet pipe (1). A magnet (2) with opposite magnetic poles to the magnet (15) is provided on the outside of the liquid inlet pipe. A conveyor belt (16) for moving the magnet (2) up and down is connected to one side of the magnet (2). The length of the conveyor belt (16) is 1 / 3 of the length of the liquid inlet pipe (1). A 15° inclined section with a filter screen (17) is provided in the top 1 / 3 section of the liquid inlet pipe (1). Below the filter screen (17) are three perforated circular plates with a thickness of 2 mm. The openings on the three perforated circular plates gradually decrease from top to bottom, and the openings of adjacent perforated circular plates are staggered. The liquid inlet pipe (1) is located below the perforated circular plates and has an outward expansion section with an inclination angle of 15° and is connected to the pipe wall of the liquid inlet pipe (1). The bottom of the liquid inlet pipe (1) is provided with a spiral liquid guide groove (21). The bottom of the spiral liquid guide groove (21) is provided with a raised conical disc (22) with the same inner diameter as the liquid inlet pipe (1) and a circular metal crushing mesh (23).

6. The magnetically coupled vortex high-efficiency gas-liquid reactor according to claim 1, characterized in that: The gas outlet pipe (2) is sleeved on the outside of the liquid inlet pipe (1) and welded to the liquid inlet pipe (1). The bottom of the gas outlet pipe (2) is provided with a gas inlet (33) that expands outward by 40°. The inner wall of the gas inlet (33) is provided with five annular grooves (32). A screen is provided in the annular grooves. The side wall of the gas outlet pipe (2) is provided with a horizontal pipe. Three arc-shaped fan blades (31) are provided in the horizontal pipe. The arc-shaped fan blades (31) are evenly distributed at 120° and form a 45° angle with the airflow direction.

7. The magnetically coupled vortex high-efficiency gas-liquid reactor according to claim 1, characterized in that: The end of the liquid outlet pipe (7) is a 30° converging conical liquid guide port, and is connected to the waste liquid tank through a hose.

8. The magnetically coupled vortex high-efficiency gas-liquid reactor according to claim 1, characterized in that: The center of the rotor assembly (6) is connected to the reaction vessel (3) via a support shaft (8). The support shaft (8) forms an annular frame by connecting with radial spokes. Eight baffles (36) are evenly arranged inside the rotor assembly (6) along the support shaft (8). The sidewall of the baffles (36) is provided with a spiral guide groove (37) opposite to the rotation direction of the rotor assembly (6). The center edge of the annular frame is provided with a positioning boss (13). One end of the baffles (36) is connected to the positioning boss (13) by bolts. The hollow part of the rotor assembly (6) is filled with filler.

9. A magnetically coupled vortex high-efficiency gas-liquid reactor according to claim 1, characterized in that: The magnet drive assembly (9) includes a first magnet disk (34), a second magnet disk (35), a magnet disk gear (11), a drive motor gear (14), and a drive motor (12). The first magnet disk (34) is located at the bottom of the rotor assembly (6), and the second magnet disk (35) is located at the bottom of the reaction vessel (3). Both the first magnet disk (34) and the second magnet disk (35) consist of sixteen arc-shaped magnets arranged on a disc-shaped frame with alternating N and S poles. The magnetic poles of the magnetic disk are misaligned and correspond to each other. The center of the magnetic disk (35) has a circular hole, and a rotating shaft (39) is provided in the circular hole. A magnetic disk gear (11) is fitted on the rotating shaft (39). The drive motor (12) is fixed to the metal base plate by bolts (38). The output shaft of the drive motor (12) is parallel to the rotating shaft (39). A drive motor gear (14) is installed on the output shaft of the drive motor (12). The magnetic disk gear (11) meshes with the drive motor gear (14). The magnetic disk (35) is fixed by a rolling bearing (10).

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