Magnetic stirrer cooled by water

Abstract

The invention provides a magnetic stirrer utilizing water cooling, which is applied to the field of magnetic stirrers and is characterized by comprising a mounting frame, a driving mechanism fixed on the mounting frame, a speed reducer fixedly arranged on the mounting frame and connected with the driving mechanism, a transmission mechanism connected with the speed reducer and stirring blades connected with the transmission mechanism, a connecting shell is fixedly arranged on the speed reducer shell; the transmission mechanism comprises a permanent magnet coupler arranged in the connecting shell, a bearing seat fixedly arranged in the shell, a bearing assembly installed in the bearing seat, a driving shaft installed on the bearing assembly and connected with the permanent magnet coupler, and a magnetic fastener installed at the end of the connecting shell and rotationally matched with the driving shaft. The water cooling system is used for cooling and dissipating heat of the transmission mechanism; the water cooling device has the advantages that heat generated by a transmission mechanism is efficiently taken away through water cooling circulation, and it is guaranteed that lubricating liquid is in a good working temperature interval all the time.

Description

Technical Field

[0001] This invention relates to the field of magnetic stirrer technology, and in particular to a water-cooled magnetic stirrer. Background Technology

[0002] A magnetic stirrer is a common laboratory and industrial device that uses magnetic coupling to drive a stir bar for non-contact stirring. Its core components include an outer magnetic rotor (usually connected to the motor shaft) located in the drive unit and an inner magnetic rotor (connected to the stir bar) placed inside the container. The two are separated by an isolated enclosure to achieve contactless power transmission. In this structure, the shaft supporting the outer magnetic rotor and its bearings are crucial to ensuring the stable operation of the equipment.

[0003] To ensure smooth rotation of the shaft and reliable long-term operation, existing technologies generally use lubricant (or grease) to lubricate the contact parts between the shaft and the bearing. The core function of the lubricant is twofold: first, to reduce frictional resistance and wear between the shaft and the bearing; second, to carry away the frictional heat and magnetic eddy currents generated during operation through the flow of the liquid, playing a crucial role in heat dissipation and preventing components from being damaged due to excessive temperature rise.

[0004] Currently, passive oil cups are mostly used for lubrication. When the amount of oil inside the bearing housing is insufficient, the heat dissipation efficiency drops sharply, which can easily lead to overheating and damage to the shaft system, resulting in low reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a water-cooled magnetic stirrer, which has the advantage of achieving forced and efficient cooling of the bearing housing and lubricating oil through the water cooling system.

[0006] To achieve the above and other related objectives, the present invention provides the following technical solution:

[0007] A water-cooled magnetic stirrer includes a mounting frame, a drive mechanism fixed on the mounting frame, a reducer fixed on the mounting frame and connected to the drive mechanism, a transmission mechanism connected to the reducer, and stirring blades connected to the transmission mechanism.

[0008] A connecting housing is fixedly installed on the housing of the reducer. The transmission mechanism includes a permanent magnet coupling installed in the connecting housing, a bearing seat fixedly installed in the housing, a bearing assembly installed in the bearing seat, a drive shaft installed on the bearing assembly and connected to the permanent magnet coupling, and a magnetic locker installed at the end of the connecting housing and rotatably engaged with the drive shaft.

[0009] It also includes a water-cooling system for cooling and dissipating heat from the transmission mechanism.

[0010] In one embodiment of the present invention, the permanent magnet coupling includes an outer magnetic rotor connected to a reducer, an inner magnetic rotor fixedly connected to a drive shaft, and a sealing sleeve disposed between the outer magnetic rotor and the inner magnetic rotor, wherein the sealing sleeve is sealed to a bearing seat; a receiving cavity for accommodating lubricating fluid is provided between the sealing sleeve and the inner magnetic rotor, and a replenishing oil cup connected to the receiving cavity is fixedly disposed on the connecting housing.

[0011] In one embodiment of the present invention, a receiving gap is provided between the bearing housing and the side wall of the drive shaft.

[0012] The drive shaft is provided with an oil passage with one end connected to the receiving cavity and the other end connected to the receiving gap.

[0013] In one embodiment of the present invention, the oil passage includes a first oil passage arranged axially along the center of the drive shaft and whose opening is connected to the receiving cavity, and a second oil passage arranged radially on the drive shaft and connected to the first oil passage, wherein the opening of the second oil passage is connected to the receiving gap.

[0014] In one embodiment of the present invention, the water cooling system includes a cooling water channel on a bearing seat, a water storage tank connected to the inlet of the cooling water channel, and a cooling tank connected to the outlet of the cooling water channel. The water storage tank and the cooling tank are connected by a water pump.

[0015] In one embodiment of the present invention, solenoid valves are provided between the water storage tank and the cooling water channel, and between the cooling tank and the cooling water channel.

[0016] In one embodiment of the present invention, a temperature sensor for monitoring the temperature of the bearing housing is provided inside the connecting housing, and the temperature sensor is electrically connected to the solenoid valve.

[0017] In one embodiment of the present invention, a drain pipe is provided at the bottom of the cooling tank, and a valve is provided on the drain pipe.

[0018] In one embodiment of the present invention, a first flange that is fixedly connected to the housing of the reducer is integrally formed at one end of the connecting housing, and a second flange that is integrally formed near the other end of the connecting housing.

[0019] In one embodiment of the present invention, the bearing assembly includes a plurality of sliding bearings mounted on a bearing housing and cooperating with a drive shaft.

[0020] As described above, the water-cooled magnetic stirrer of the present invention has the following beneficial effects:

[0021] 1. The receiving cavity and receiving gap contain lubricating fluid. The lubricating fluid is used to reduce the frictional resistance and wear between the drive shaft and the bearing, and the flow of the liquid carries away the frictional heat and the heat generated by magnetic eddy currents during operation, while playing a role in initial cooling and heat dissipation. The oil passages provided on the drive shaft are used to guide the lubricating fluid in the receiving cavity to the receiving gap, while also further cooling and heat dissipating the drive shaft.

[0022] 2. The cooling water channel is set on the bearing housing. When external cooling water flows into the cooling water channel of the bearing housing, the cooling water flow carries away the heat on the bearing housing. Because the lubricant inside the bearing housing is in full contact, the heat of the lubricant can be efficiently transferred to the bearing housing and continuously exchanged and carried away by the flowing cooling water, thereby achieving active and forced cooling of the lubricant and the entire shaft system structure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of the connection structure between the transmission mechanism and the stirring blade in Embodiment 1 of the present invention;

[0025] Figure 3 This is a cross-sectional view of the transmission mechanism of Embodiment 1 of the present invention;

[0026] Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention.

[0027] Reference numerals: 1. Mounting bracket; 2. Drive mechanism; 21. Pulley assembly; 3. Reducer; 31. Third flange; 4. Transmission mechanism; 41. Connecting housing; 42. Permanent magnet coupling; 421. External magnetic rotor; 422. Internal magnetic rotor; 423. Sealing sleeve; 424. Receiving cavity; 425. Fluid replenishment cup; 426. Receiving gap; 43. Bearing seat; 44. Bearing assembly; 441. Sliding bearing; 45. Drive shaft; 451. Oil passage; 46. Magnetic lock; 5. Stirring blades; 6. Water cooling system; 61. Cooling water passage; 62. Water storage tank; 63. Cooling tank; 631. Drain pipe; 64. Water pump; 411. First flange; 412. Second flange; 413. Mounting flange; 7. Stirring tank; 71. Fourth flange. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0029] Please see Figures 1 to 4It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0030] Example 1

[0031] Please see Figure 1 , Figure 2 and Figure 3 The present invention provides a water-cooled magnetic stirrer, which mainly includes a mounting frame 1, a drive mechanism 2, a reducer 3, a transmission mechanism 4, stirring blades 5, and a water cooling system 6.

[0032] Mounting bracket 1 is bolted to the top of the housing of reducer 3, and drive mechanism 2 is bolted to mounting bracket 1. In this embodiment, drive mechanism 2 can be a motor. The output shaft of the motor and the input shaft of reducer 3 can be connected by pulley assembly 21. A connecting housing 41 is fixedly installed on the housing of reducer 3. A third flange 31 is integrally formed on the housing of reducer 3 located outside the output shaft of reducer 3. A first flange 411 is integrally formed at one end of the connecting housing 41 and bolted to the third flange 31; a second flange 412 is integrally formed near the other end, and a mounting flange 413 is bolted to the second flange 412.

[0033] Please see Figure 1 , Figure 2 and Figure 3The transmission mechanism 4 is located inside the connecting housing 41. The transmission mechanism 4 includes a permanent magnet coupling 42, a bearing seat 43, a bearing assembly 44, a drive shaft 45, and a magnetic lock 46. The permanent magnet coupling 42 includes an outer magnetic rotor 421 bolted to the output shaft of the reducer 3, an inner magnetic rotor 422 fixedly connected to the drive shaft 45 via a keyway, and a sealing sleeve 423 fixed between the outer magnetic rotor 421 and the inner magnetic rotor 422. In this embodiment, the sealing sleeve 423 is usually made of non-magnetic materials such as stainless steel, which separates the outer magnetic rotor 421 from the inner magnetic rotor 422 and forms a sealed cavity 424 between it and the inner magnetic rotor 422 for storing lubricating fluid. A replenishing oil cup 425 is screwed into the top of the connecting housing 41, and its channel communicates with the cavity 424 for periodically replenishing lubricating fluid into the cavity 424.

[0034] Please see Figure 1 , Figure 2 and Figure 3 The bearing housing 43 is fixedly installed in the inner cavity of the connecting housing 41 by bolts. In this embodiment, the bearing assembly 44 includes a plurality of sliding bearings 441. The sliding bearings 441 can be graphite bearings or copper-based oil-impregnated bearings, which are press-fitted into the inner hole of the bearing housing 43. The drive shaft 45 passes through the sliding bearings 441 and can rotate freely. An annular receiving gap 426 is formed between the bearing housing 43 and the outer wall of the drive shaft 45, and this gap is also filled with lubricating fluid.

[0035] The magnetic locking device 46 is installed at the end of the connecting housing 41 and rotates with the drive shaft 45, thereby axially locking the drive shaft 45 onto the connecting housing 41; the stirring blade 5 is bolted to the end of the drive shaft 45 away from the permanent magnet coupling 42.

[0036] Please see Figure 1 , Figure 2 and Figure 3 The drive shaft 45 is equipped with an oil passage 451 inside, which enables the circulation of lubricating fluid and auxiliary heat dissipation. The oil passage 451 includes a first oil passage 451 and several second oil passages 451. The first oil passage 451 extends axially along the central axis of the drive shaft 45, and one end of the first oil passage 451 opens at the top of the drive shaft 45, directly opposite the bottom of the receiving cavity 424. Several second oil passages 451 penetrate radially through the side wall of the drive shaft 45 and are connected to the first oil passage 451. The outlet of the second oil passage 451 is aligned with the receiving gap 426. During operation, the lubricating fluid in the receiving cavity 424 flows through the first oil passage 451 to the second oil passages 451 under the action of centrifugal force and temperature difference, and is finally thrown into the receiving gap 426, thereby lubricating the mating surface between the sliding bearing 441 and the drive shaft 45 and carrying away frictional heat. The lubricating fluid eventually flows back to the bottom of the receiving cavity 424, forming a cycle.

[0037] Please see Figure 1 , Figure 2 and Figure 3 The water cooling system 6 is used to cool and dissipate heat from the transmission mechanism 4. The water cooling system 6 includes a cooling water channel 61, a water storage tank 62, and a cooling tank. The cooling water channel 61 is set on the bearing seat 43 and surrounds the bearing seat 43 several times. The water storage tank 62 can be fixedly installed outside the equipment by a bracket and is used to store room temperature cooling water. The cooling tank is also installed outside the equipment and is used to receive and cool the warm water after heat exchange. In this embodiment, the cooling tank can be cooled by installing a semiconductor cooling chip on the side wall of the cooling tank to achieve the cooling effect of the cooling tank. A water pump 64 is connected between the water storage tank 62 and the cooling tank. The water pump 64 is used to return the cooled water in the cooling tank to the water storage tank 62 to form a water circulation.

[0038] A first solenoid valve is installed on the pipe connecting the outlet of the water storage tank 62 to the inlet of the cooling water channel 61, and a second solenoid valve is installed on the pipe connecting the outlet of the cooling water channel 61 to the inlet of the cooling tank. A temperature sensor is also installed on the inner wall of the connecting housing 41, with its probe closely attached to the outer wall of the bearing seat 43 for real-time temperature monitoring. The temperature sensor, the first solenoid valve, and the second solenoid valve are all electrically connected to an external controller.

[0039] Brief description of usage:

[0040] After the equipment is started, the drive mechanism 2 drives the outer magnetic rotor 421 to rotate through the reducer 3. The outer magnetic rotor 421 drives the inner magnetic rotor 422, the drive shaft 45, and the stirring blade 5 to rotate together through magnetic coupling. The heat generated by friction and eddy current is absorbed by the lubricating fluid.

[0041] When the temperature sensor detects that the temperature of the bearing housing 43 exceeds the preset safety threshold (e.g., 60°C) of the controller, the controller issues a command and starts the water pump 64. The water pump 64 draws the cooling water in the cooling tank into the storage tank 62, and then opens the second solenoid valve. The heated water flows out from the outlet, passes through the second solenoid valve, and enters the cooling tank for temporary storage and cooling. The second solenoid valve then closes. Then the first solenoid valve opens, and the cooling water in the storage tank 62 flows into the cooling water channel 61 on the bearing housing 43 under the action of gravity. The first solenoid valve closes. During the flow, the cooling water exchanges heat with the high-temperature bearing housing 43, fully absorbing its heat, thus completing a complete cooling cycle.

[0042] The bottom of the cooling tank is also equipped with a drain pipe 631 with a valve, which facilitates the drainage of water in the system during maintenance.

[0043] Example 2

[0044] Please see Figure 4The present invention also includes a mixing tank 7, wherein a through hole is provided on the upper side wall of the mixing tank 7, wherein the transmission mechanism 4 is inserted into the through hole and is sealed to the through hole; a fourth flange 71 is welded and fixed on the side wall of the mixing tank 7 on the outer circumference, and the mounting flange 413 and the fourth flange 71 are fixed together by bolts.

[0045] Installation process in brief: Without the stirring blades 5 installed on the transmission mechanism 4, insert part of the transmission mechanism 4 into the through hole, and then fix the fourth flange 71 and the mounting flange 413 together with bolts to achieve a seal between the transmission mechanism 4 and the mixing tank 7; finally, fix the stirring blades 5 to the drive shaft 45 with bolts; the installation is complete.

[0046] In summary, the active water cooling circulation of this invention efficiently removes the heat generated by the transmission components, ensuring that the lubricant is always within a good operating temperature range. This not only greatly improves heat dissipation efficiency and eliminates the risk of overheating damage, but also extends the service life of the lubricant and key components such as bearings and shafts, thereby improving the reliability and stability of equipment operation.

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A magnetic stirrer cooled by water, characterized by: The application relates to a stirring device, which comprises a mounting frame (1), a driving mechanism (2) fixed on the mounting frame (1), a speed reducer (3) fixedly arranged on the mounting frame (1) and connected with the driving mechanism (2), a transmission mechanism (4) connected with the speed reducer (3) and a stirring blade (5) connected with the transmission mechanism (4). The transmission mechanism (4) comprises a permanent magnet coupling (42) arranged in a connecting shell (41), a bearing seat (43) fixedly arranged in the shell, a bearing assembly (44) arranged in the bearing seat (43), a driving shaft (45) arranged on the bearing assembly (44) and connected with the permanent magnet coupling (42) and a magnetic force locker (46) arranged at the end of the connecting shell (41) and rotationally matched with the driving shaft (45). The application further comprises a water cooling system (6) arranged for cooling and heat dissipation of the transmission mechanism (4).

2. A magnetic stirrer using water cooling according to claim 1, characterized in that: The permanent magnet coupling (42) comprises an outer magnetic rotor (421) connected with the speed reducer (3), an inner magnetic rotor (422) fixedly connected with the driving shaft (45) and a sealing sleeve (423) arranged between the outer magnetic rotor (421) and the inner magnetic rotor (422), wherein the sealing sleeve (423) is sealingly connected with the bearing seat (43); a containing cavity (424) for containing lubricating liquid is arranged between the sealing sleeve (423) and the inner magnetic rotor (422), and a liquid supplementing oil cup (425) connected with the containing cavity (424) is fixedly arranged on the connecting shell (41).

3. A magnetic stirrer with water cooling according to claim 2, characterized in that: A containing gap (426) is arranged between the bearing seat (43) and the side wall of the driving shaft (45). An oil channel (451) is arranged on the driving shaft (45) and connected at one end with the containing cavity (424) and at the other end with the containing gap (426).

4. A magnetic stirrer using water cooling according to claim 3, characterized in that: The oil channel (451) comprises a first oil channel (451) arranged along the central axis of the driving shaft (45) and having an opening connected with the containing cavity (424) and a second oil channel (451) arranged radially on the driving shaft (45) and connected with the first oil channel (451), wherein the opening of the second oil channel (451) is connected with the containing gap (426).

5. A magnetic stirrer using water cooling according to claim 4, characterized in that: The water cooling system (6) comprises a cooling water channel (61) arranged on the bearing seat (43), a water storage barrel (62) connected with the water inlet of the cooling water channel (61), a cooling barrel (63) connected with the water outlet of the cooling water channel (61), and the water storage barrel (62) is connected with the cooling barrel through a water pump (64).

6. A magnetic stirrer using water cooling according to claim 5, characterized in that: An electromagnetic valve is arranged between the water storage barrel (62) and the cooling water channel (61) and between the cooling barrel and the cooling water channel (61).

7. A magnetic stirrer using water cooling according to claim 6, characterized in that: A temperature sensor for monitoring the temperature of the bearing seat (43) is arranged in the connecting shell (41), and the temperature sensor is electrically connected with the electromagnetic valve.

8. A magnetic stirrer using water cooling according to claim 6, characterized in that: A drain pipe (631) is arranged at the bottom of the cooling barrel, and a valve is arranged on the drain pipe (631).

9. A magnetic stirrer using water cooling according to claim 1, characterized in that: A first flange plate (411) is integrally formed at one end of the connecting shell (41) and fixedly connected with the speed reducer shell, and a second flange plate (412) is integrally formed at the other end of the connecting shell (41).

10. A magnetic stirrer using water cooling according to claim 1, characterized in that: The bearing assembly (44) comprises a plurality of sliding bearings (441) mounted on a bearing seat (43) and cooperating with the driving shaft (45).

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