A leak-proof, seal-free, magnetically driven pump

Abstract

This invention relates to the field of magnetic pump technology and discloses a leak-proof, shaftless, magnetically driven pump, comprising a front cover and a rear cover. The rear cover houses an excitation winding, while the front cover rotatably houses an inner magnetic frame and multiple permanent magnets. An impeller is fixedly connected to one end of the inner magnetic frame. An isolation sleeve is provided between the inner magnetic frame and the excitation winding. A cavity is provided on the outer wall of the isolation sleeve, and a temperature sensor is housed within the cavity. The rear cover includes a resistance wire coil, a slide rod electrically connected to the excitation winding, and an elastic slide plate slidably connected between the slide rod and the resistance wire coil. A clamping mechanism for holding the slide rod and a lifting mechanism for pushing the elastic slide plate are also provided. This invention locks the current supply when the temperature sensor detects a first threshold temperature to prevent increased pump speed from impacting and deforming the isolation sleeve. When the detected temperature reaches a second threshold temperature, the pump is forcibly stopped to avoid more serious consequences.

Description

Technical Field

[0001] This invention relates to the field of magnetic pump technology, specifically to a leak-proof, shaft-sealed magnetically driven pump. Background Technology

[0002] Magnetic drive pumps are crucial leak-free fluid transport equipment in modern industry. Traditional permanent magnet coupled magnetic pumps transmit torque through the interaction of permanent magnets on an outer magnetic rotor and an inner magnetic rotor, resulting in a relatively simple structure. However, to achieve higher controllability and power density, an improved design replaces the permanent magnets on the outer magnetic rotor with an excitation winding. By supplying a phase-orderly changing current to the excitation winding, an adjustable and directional rotating electromagnetic field is actively generated. This rotating magnetic field penetrates the isolation sleeve, driving the inner magnetic frame and impeller, which contain embedded permanent magnets, to rotate synchronously, thus achieving contactless power transmission. This design completely replaces the dynamic seal of traditional pumps with a static seal, fundamentally eliminating the risk of leakage at the shaft seal, making it particularly suitable for transporting flammable, explosive, toxic, or highly corrosive media.

[0003] However, when using magnetically driven pumps to transport corrosive media containing strong acids or alkalis, these media will cause continuous chemical corrosion to the isolation sleeve material (such as high-grade stainless steel, Hastelloy, titanium, etc.). Long-term corrosion will cause the isolation sleeve wall thickness to gradually decrease, and its mechanical strength will decrease accordingly. On the one hand, this directly increases the risk of media leakage due to corrosion perforation, seriously threatening production safety and the environment. On the other hand, the increased volume of the internal cavity of the isolation sleeve reduces the internal pressure of the pump cavity, leading to an increase in internal fluid resistance. This causes the centrifugal pump to consume more energy to meet the working requirements, which will result in a significant reduction in the delivery flow rate, thus failing to meet the normal process production requirements and affecting overall efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a leak-proof, shaft-sealed, magnetically driven pump to solve the problems mentioned above.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A leak-proof, shaftless, magnetically driven pump includes a front cover and a rear cover connected by bolts. The rear cover contains an excitation winding, and the front cover contains an inner magnetic frame that rotates rotatably. The inner magnetic frame contains a plurality of permanent magnets, and one end of the inner magnetic frame is fixedly connected to an impeller. An isolation sleeve is provided between the inner magnetic frame and the excitation winding.

[0007] The outer wall of the isolation sleeve is provided with a cavity, and a temperature sensor is provided inside the cavity. The detection probe of the temperature sensor is covered with a layer of heat insulation cotton.

[0008] The rear cover is provided with a resistance wire coil, a slide rod electrically connected to the excitation winding, and an elastic slide piece slidably connected between the slide rod and the resistance wire coil, as well as a clamping mechanism for clamping the slide rod and a lifting mechanism for pushing the elastic slide piece.

[0009] When the temperature sensor detects that the temperature has reached the first threshold, the clamping mechanism clamps the slide bar to lock the position of the elastic slider. Then, when the temperature continues to rise to the second threshold, the lifting mechanism pushes the elastic slider to separate from the resistance wire coil.

[0010] As a preferred embodiment of the leak-proof shaftless magnetically driven pump of the present invention, the number of the plurality of permanent magnets and excitation windings is even, the plurality of permanent magnets and excitation windings are evenly distributed around the axis of the isolation sleeve, and the electromagnetic field generated by the excitation winding after being energized interacts with the magnetic field of the plurality of permanent magnets, thereby driving the inner magnetic frame to drive the impeller to rotate.

[0011] As a preferred embodiment of the leak-proof shaftless magnetically driven pump of the present invention, wherein: the outer wall of the isolation sleeve is provided with a sealing cover adapted to the cavity at the position corresponding to the cavity, and the sealing cover is sealed and connected to the opening of the cavity.

[0012] As a preferred embodiment of the leak-proof, shaftless, magnetically driven pump of the present invention, wherein: a shaft frame is fixed inside the front cover, a pump shaft is inserted between the shaft frame and the isolation sleeve, a bearing is rotatably sleeved on the outside of the pump shaft, the inner magnetic frame is fixed to the outside of the bearing, and a spiral flow channel is provided on the inside of the bearing.

[0013] As a preferred embodiment of the leak-proof, shaftless, magnetically driven pump of the present invention, wherein: the outer side of the front cover is provided with an inlet and an outlet, the inlet is located on one side of the center position of the impeller, and the outlet is located in the extension direction of one of the tangents of the impeller.

[0014] As a preferred embodiment of the leak-proof, shaftless, magnetically driven pump of the present invention, wherein: a junction box is provided on the rear cover, the resistance wire coil, the slide rod and the elastic slide plate are all disposed inside the junction box, a slider is slidably connected to the outside of the slide rod, one end of the slider extends to the outside of the junction box, and the elastic slide plate is fixedly connected to the slider.

[0015] As a preferred embodiment of the leak-proof, shaftless, magnetically driven pump of the present invention, the clamping mechanism includes two clamping blocks symmetrically slidably connected within the slider, and the two clamping blocks are respectively located on both sides of the slide rod. Anti-slip pads are fixed on the clamping sides of the two clamping blocks, and a first spring is connected between the two clamping blocks.

[0016] As a preferred embodiment of the leak-proof shaftless magnetically driven pump of the present invention, the lifting mechanism includes a pressure plate slidably disposed in the slider and a rotating plate rotatably connected to the slider. A second spring is fixedly connected between the pressure plate and the slider. A groove is provided on one side of the pressure plate. One end of the rotating plate is slidably fitted in the groove. A flexible heat-conducting film is fixedly connected between the other end of the rotating plate and the elastic slide plate.

[0017] As a preferred embodiment of the leak-proof, shaftless, magnetically driven pump of the present invention, wherein: a U-shaped pusher is slidably connected inside the slider, and inclined surfaces that slide and cooperate with each other are provided on both ends of the pusher and on the two clamping blocks respectively; both ends of the pusher can be moved to abut against one side of the pressure plate and push the pressure plate to move.

[0018] As a preferred embodiment of the leak-proof, shaftless, magnetically driven pump of the present invention, wherein: an electric push rod is fixedly installed inside the slider, and the telescopic end of the electric push rod is fixedly connected to the push frame.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. After the isolation sleeve is corroded by the conveyed medium until it penetrates the cavity through corrosion perforations, the insulation cotton absorbs water, making it easier for heat to be transferred to the temperature sensor through the liquid. When the temperature sensor detects that the temperature has reached the first threshold, it sends a signal to the main controller. The main controller controls the electric push rod to push the push frame to move, so that the two clamping blocks approach the slide rod and clamp and fix the slide rod, thereby locking the relative position of the elastic slide plate and the resistance wire coil, and thus locking and limiting the current flowing into the excitation winding. This action is used to prevent the pump speed from increasing due to improper operation by the staff, thereby avoiding excessive fluid dynamics from impacting or deforming the corroded and thinned isolation sleeve. At the same time, the main controller will also issue an early warning to remind the staff to replace the isolation sleeve in time to prevent the risk from further expanding.

[0021] 2. When the conveying cannot be stopped immediately due to production process reasons, the magnetic drive pump still needs to continue to work. As the inner wall of the isolation sleeve gradually thins due to corrosion, the eddy current effect intensifies, causing the temperature to rise continuously. When the temperature sensor detects that the temperature has reached the second threshold, it sends a signal to the main controller. At this time, the main controller controls the electric push rod to continue to push the push frame to move, so that the end of the push frame pushes the pressure plate, causing the slide to push the rotating plate to rotate. This causes one end of the rotating plate to push the elastic slide plate outward, separating its contact from the resistance wire coil, thereby de-energizing the excitation winding and forcing the magnetic drive pump to stop working. This protection measure can effectively prevent the medium inside the isolation sleeve from leaking into the back cover, which could cause corrosion damage to key electrical components such as the excitation winding, ensuring equipment safety and preventing major accidents.

[0022] 3. The flexible heat-conducting film can guide the heat of the elastic slider to the rotating plate, thereby increasing the heat dissipation area. Moreover, the flexible heat-conducting film is in a taut state during pump operation, which can further increase the heat dissipation area, thereby improving the heat dissipation efficiency of the elastic slider, effectively reducing the probability of the elastic slider bending and deforming after being lifted at high temperature, and improving the reliability of equipment operation.

[0023] 4. During use, current flows through the elastic slider, generating continuous heat that causes it to soften and become more prone to bending and deformation. To ensure the elastic slider can return to its original position after being lifted and maintain effective connection with the resistance wire coil during subsequent use, a second spring pushes the pressure plate during the reset process. This movement, via the slide groove, causes the rotating plate to rotate, which in turn pulls the elastic slider back to its original position through the flexible heat-conducting film. The spring force of the second spring causes the pressure plate to apply rotational force to the rotating plate via the slide groove. This, in turn, causes the end of the rotating plate to apply tension to the flexible heat-conducting film, keeping it in a taut state and converting it into a continuous pulling force towards the resistance wire coil. This ensures that the elastic slider remains in close contact with the resistance wire coil surface during equipment operation, preventing poor contact and guaranteeing reliable equipment operation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the first three-dimensional structure of the leak-proof, shaftless, magnetically driven pump of the present invention.

[0025] Figure 2 This is a schematic diagram of the second three-dimensional structure of the leak-proof, shaftless, magnetically driven pump of the present invention.

[0026] Figure 3 This is a schematic diagram of the third three-dimensional structure of the leak-proof, shaftless, magnetically driven pump of the present invention.

[0027] Figure 4 This is a cross-sectional schematic diagram of the leak-proof, shaftless, magnetically driven pump of the present invention.

[0028] Figure 5 This is a three-dimensional structural diagram of the front cover and isolation sleeve of the leak-proof shaftless magnetically driven pump of the present invention.

[0029] Figure 6 This is a cross-sectional view of the front cover and isolation sleeve assembly of the leak-proof shaftless magnetically driven pump of the present invention.

[0030] Figure 7 This is a three-dimensional structural diagram of the isolation sleeve and impeller assembly of the leak-proof, shaftless, magnetically driven pump of the present invention.

[0031] Figure 8 This is a cross-sectional view of the isolation sleeve and impeller assembly of the leak-proof, shaftless, magnetically driven pump of the present invention.

[0032] Figure 9 This is a schematic diagram of the three-dimensional structure of the rear cover assembly of the leak-proof, shaftless, magnetically driven pump of the present invention.

[0033] Figure 10 This is a cross-sectional view of the rear cover assembly of the leak-proof, shaftless, magnetically driven pump of the present invention.

[0034] Figure 11 This is a three-dimensional structural diagram of the resistor coil assembly of the leak-proof, shaftless, magnetically driven pump of the present invention.

[0035] Figure 12 This is a first cross-sectional view of the slider assembly of the leak-proof, shaftless, magnetically driven pump of the present invention.

[0036] Figure 13 This is a second cross-sectional view of the slider assembly of the leak-proof, shaftless, magnetically driven pump of the present invention.

[0037] In the diagram: 1. Front cover; 11. Liquid inlet; 12. Liquid outlet; 2. Rear cover; 21. Excitation winding; 22. Junction box; 23. Slider; 231. Resistance wire coil; 232. Slide rod; 233. Elastic slide plate; 234. Flexible heat-conducting film; 235. Rotating plate; 236. Clamping block; 2361. First spring; 237. Push frame; 238. Pressure plate; 2381. Second spring; 239. Electric push rod; 3. Impeller; 4. Pump shaft; 5. Bearing; 6. Inner magnetic frame; 61. Permanent magnet; 7. Isolation sleeve; 71. Temperature sensor; 72. Heat insulation cotton; 73. Sealing cover. Detailed Implementation

[0038] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific configurations and algorithms presented below, but covers any modifications, substitutions, and improvements to elements, components, and algorithms without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description in order to avoid unnecessarily obscuring the invention.

[0039] Example 1, referring to Figures 1-13The first embodiment of the present invention provides a leak-proof shaftless magnetic drive pump. This leak-proof shaftless magnetic drive pump includes a front cover 1 and a rear cover 2 connected by bolts. The rear cover 2 is provided with an excitation winding 21. The front cover 1 is rotatably provided with an inner magnetic frame 6. Multiple permanent magnets 61 are fixed in the inner magnetic frame 6. An impeller 3 is fixedly connected to one end of the inner magnetic frame 6. An isolation sleeve 7 is provided between the inner magnetic frame 6 and the excitation winding 21.

[0040] The outer wall of the isolation sleeve 7 is provided with a cavity, and a temperature sensor 71 is provided inside the cavity. The outer side of the detection probe of the temperature sensor 71 is covered with a layer of heat insulation cotton 72.

[0041] The rear cover 2 is provided with a resistance wire coil 231, a slide rod 232 electrically connected to the excitation winding 21, and an elastic slide piece 233 slidably connected between the slide rod 232 and the resistance wire coil 231, as well as a clamping mechanism for clamping the slide rod 232 and a lifting mechanism for pushing the elastic slide piece 233.

[0042] When the temperature sensor 71 detects that the temperature has reached the first threshold, the clamping mechanism clamps the slide bar 232 to lock the position of the elastic slide 233. Then, when the temperature continues to rise to the second threshold, the lifting mechanism pushes the elastic slide 233 to separate from the resistance wire coil 231.

[0043] The number of permanent magnets 61 and excitation windings 21 is even. The permanent magnets 61 and excitation windings 21 are evenly distributed around the axis of the isolation sleeve 7. The electromagnetic field generated by the excitation windings 21 after being energized interacts with the magnetic field of the permanent magnets 61, thereby driving the inner magnetic frame 6 to rotate the impeller 3.

[0044] The front cover 1 has an inlet 11 and an outlet 12 on its outer side. The inlet 11 is located on one side of the center of the impeller 3, and the outlet 12 is located in the extension direction of one of the tangents of the impeller 3.

[0045] The rear cover 2 is provided with a junction box 22. The resistance wire coil 231, the slide rod 232 and the elastic slide plate 233 are all set inside the junction box 22. The slide rod 23 is slidably connected to the outside of the slide rod 232. One end of the slide plate 23 extends to the outside of the junction box 22. The elastic slide plate 233 is fixedly connected to the slide plate 23.

[0046] The clamping mechanism includes two clamping blocks 236 symmetrically slidably connected within the slider 23, and the two clamping blocks 236 are respectively located on both sides of the slide rod 232. Anti-slip pads are fixed on the clamping sides of the two clamping blocks 236, and a first spring 2361 is connected between the two clamping blocks 236.

[0047] The lifting mechanism includes a pressure plate 238 slidably disposed in the slider 23 and a rotating plate 235 rotatably connected to the slider 23. A second spring 2381 is fixedly connected between the pressure plate 238 and the slider 23. A groove is provided on one side of the pressure plate 238. One end of the rotating plate 235 is slidably fitted in the groove. A flexible heat-conducting film 234 is fixedly connected between the other end of the rotating plate 235 and the elastic slide plate 233.

[0048] The slider 23 is slidably connected to a U-shaped pusher 237. The pusher 237 and the two clamps 236 are respectively provided with inclined surfaces that slide against each other. The two ends of the pusher 237 can be moved to abut against one side of the pressure plate 238 and push the pressure plate 238 to move.

[0049] An electric push rod 239 is fixedly installed inside the slider 23, and the telescopic end of the electric push rod 239 is fixedly connected to the push frame 237.

[0050] During use, an external power supply is electrically connected to one end of the resistance wire coil 231. When the external power supply is turned on, current flows through the resistance wire coil 231, the elastic slider 233, and the slider 232 into the excitation winding 21. The current flowing in is a current with an ordered phase change, which causes the excitation winding 21 to generate a rotating electromagnetic field. This rotating magnetic field penetrates the isolation sleeve 7 and interacts with the magnetic field generated by the permanent magnet 61 on the inner magnetic frame 6, thereby driving the multiple permanent magnets 61 on the inner magnetic frame 6 to rotate. The permanent magnets 61 directly drive the impeller 3 to rotate around the central axis of the inner magnetic frame 6.

[0051] When the impeller 3 rotates, it creates a pressure difference between the pump chamber between the front cover 1 and the isolation sleeve 7 and the outside. The liquid being transported is drawn into the impeller 3 from the inlet 11 and transported to the outlet 12 by the centrifugal force generated by the rotation of the impeller 3. Finally, it is discharged from the outlet 12, thus completing the transport of the medium.

[0052] During the production process, the isolation sleeve 7 undergoes a predetermined corrosion rate to minimize its impact on the pump during the initial corrosion thinning process. However, when the corrosion thinning of the isolation sleeve 7 exceeds the predetermined rate, corrosion perforation occurs in the portion between the cavity and the inner wall of the isolation sleeve 7. This allows the medium being pumped to enter the cavity through the corrosion perforation. Inside the cavity, the insulation cotton 72 located outside the temperature sensor 71 rapidly absorbs water, quickly filling the pores within the insulation cotton 72. Since the thermal conductivity of liquid is much higher than that of air, the heat of the pumped medium is more easily transferred to the temperature sensor 71. The temperature sensor 71 detects the temperature of the liquid at this point, which is set as a first threshold. When the temperature sensor 71 reaches the first threshold, it sends a signal to the main controller. The main controller then activates the electric push rod 239, causing it to extend its telescopic end and push the push frame 237 to move. The two ends of the push frame 237 are connected to two... The inclined surfaces on the clamping blocks 236 slide together, allowing the two clamping blocks 236 to move within the slider 23 toward the central slide rod 232, simultaneously compressing the first spring 2361 until the anti-slip pads on the two clamping blocks 236 press firmly against the slide rod 232. At this point, the two clamping blocks 236 move into the interior of the U-shaped push frame 237, thus clamping and fixing the slide rod 232. This fixes the slider 23 and the slide rod relative to each other, thereby fixing the contact position of the elastic slider 233 on the resistance wire coil 231. This prevents operators from adjusting the resistance value of the resistance wire coil 231 by pushing the slider 23, thus preventing improper operation from increasing the current and thus increasing the pump speed. It also prevents excessive fluid dynamics from impacting or deforming the corroded and thinned isolation sleeve. At the same time, the main controller will issue a warning, reminding operators to replace the corroded isolation sleeve 7 in time to prevent further risk expansion.

[0053] However, when the conveying cannot be stopped immediately due to production process reasons or when the economic loss caused by stopping the conveying operation during the medium conveying process is too high, the magnetic drive pump still needs to continue to work for a period of time. During this part of the conveying process, the main controller will continuously issue warnings to ensure that the staff can still know that the isolation sleeve 7 needs to be replaced after the conveying work is completed, so as to avoid safety accidents.

[0054] In addition, the inner wall of the isolation sleeve 7 gradually thins due to corrosion. To ensure a certain rigidity, the isolation sleeve 7 is often made of metal materials, such as high-grade stainless steel, Hastelloy, titanium, etc. The isolation sleeve 7 is located between the excitation winding 21 and the rotating permanent magnet 61. The isolation sleeve 7 is subjected to a sinusoidal alternating magnetic field, which induces a current inside it. The induced current closes itself within the wall thickness of the isolation sleeve 7 to form eddy currents. The eddy currents generate a lot of heat in the isolation sleeve. Therefore, the main temperature of the isolation sleeve 7 comes from the heat generated by the eddy current effect. As the wall thickness of the isolation sleeve 7 gradually decreases, the eddy current path shortens and the resistance decreases, resulting in an increase in eddy current intensity and heat. This causes the temperature of the isolation sleeve 7 to gradually rise, which in turn causes the temperature of the liquid inside the isolation sleeve 7 to continue to rise.

[0055] When the temperature sensor 71 detects that the temperature exceeds the first threshold, and the magnetically driven pump still needs to continue operating, if the temperature sensor 71 detects that the temperature continues to rise and reaches the second threshold, it indicates that the isolation sleeve 7 is approaching its failure limit. If operation continues, the risk of leakage of the isolation sleeve 7 will greatly increase. At this time, the temperature sensor 71 sends a signal to the main controller, which controls the electric push rod 239 to start again, causing the electric push rod 239 to continue to extend its telescopic end, thereby pushing the push frame 237 to move. At this time, the clamping block 236 is located inside the U-shaped push frame 237 and will not obstruct the movement of the push frame 237, allowing the end of the push frame 237 to continue moving. The pump moves until it contacts the pressure plate 238, and then pushes the pressure plate 238 to move, causing one end of the rotating plate 235 to move through the slide groove. This causes one end of the rotating plate 235 to rotate on the slider 23, thereby causing one end of the rotating plate 235 to push the elastic slider 233 outward, causing the contact of the elastic slider 233 to separate from the resistance wire coil 231, thereby de-energizing the excitation winding 21. This forces the magnetic drive pump to stop working. This protection measure can effectively prevent the medium inside the isolation sleeve 7 from leaking into the back cover, thereby preventing corrosion damage to key electrical components such as the excitation winding 21, ensuring equipment safety and preventing major accidents.

[0056] After replacing the isolation sleeve 7, the main controller controls the electric push rod 239 to retract and reset. During this process, the elastic force of the first spring 2361 causes the two clamps 236 to move to both sides, releasing the clamps 236 from the slide rod 232. This allows the operator to control the relative position of the elastic slider 233 and the resistance wire coil 231 by sliding the slider 23, thereby controlling the resistance of the resistance wire coil 231 connected to the circuit and thus controlling the current flowing into the excitation winding 21. The elastic force of the second spring 2381 drives the pressure plate 238 to move, causing the groove on one side of the pressure plate 238 to move one end of the rotating plate 235. This causes the rotating plate 235 to rotate on the slider 23, separating the other end of the rotating plate 235 from the elastic slider 233. The elastic slider 233 then rebounds under its own elastic force to contact the resistance wire coil 231, thus resetting the structure for future use.

[0057] The flexible thermal conductive film 234 is an insulating thermal conductive material that will not affect the normal operation of the current. The flexible thermal conductive film 234 can guide and disperse the heat of the elastic slider 233 to the rotating plate 235, thereby increasing the effective heat dissipation area of ​​the elastic slider 233. Moreover, the flexible thermal conductive film 234 is in a tensioned state during pump operation, which can further increase the heat dissipation area and effectively reduce the probability of the elastic slider 233 bending and deforming after being lifted at high temperature, thus improving the reliability of equipment operation.

[0058] In addition, during use, current flows through the elastic slider 233, causing it to continuously generate heat. This heat causes the elastic slider 233 to soften and become more easily bent and deformed. To ensure that the elastic slider 233 can return to its original position after being lifted and can still be effectively connected to the resistance wire coil 231 during subsequent use, the elastic force of the second spring 2381 causes the pressure plate 238 to apply rotational force to the rotating plate 235 through the slide groove during the return process. This causes the end of the rotating plate 235 to apply tension to the elastic slider 233 through the flexible heat-conducting film 234. This tension keeps the flexible heat-conducting film 234 in a taut state. This taut state converts the elastic slider 233 into a continuous pulling force towards the resistance wire coil 231, ensuring that the elastic slider 233 remains in close contact with the surface of the resistance wire coil 231 during equipment operation. This prevents poor contact and ensures reliable operation of the equipment.

[0059] The number of multiple permanent magnets 61 and excitation windings 21 is even, mainly to ensure the symmetry and stability of the magnetic drive system and avoid mechanical vibration or magnetic energy fluctuations caused by asymmetrical magnetic pole arrangement.

[0060] Example 2, refer to Figures 4-8 This is the second embodiment of the present invention, which differs from the first embodiment in that:

[0061] A shaft bracket is fixed inside the front cover 1. A pump shaft 4 is inserted between the shaft bracket and the isolation sleeve 7. A bearing 5 is rotatably sleeved on the outside of the pump shaft 4. An inner magnetic frame 6 is fixed on the outside of the bearing 5. Multiple spiral flow channels are provided on the inside of the bearing 5.

[0062] The shaft frame is equipped with three protruding guide plates, which are connected to the inner wall of the liquid inlet 11, and the three guide plates are evenly distributed around the axis of the shaft frame.

[0063] During use, after the excitation winding 21 is energized, a rotating electromagnetic field is generated, which penetrates the isolation sleeve 7 and interacts with the magnetic field generated by the permanent magnet 61 on the inner magnetic frame 6. As a result, when the multiple permanent magnets 61 on the inner magnetic frame 6 are driven to rotate, the permanent magnets 61 drive the impeller 3 to rotate. The impeller 3 and the inner magnetic frame 6 drive the bearing 5 to rotate outside the pump shaft 4, thereby ensuring that the impeller can rotate stably in the pump cavity between the front cover 1 and the isolation sleeve 7, effectively preventing the phenomenon of unstable conveying process caused by the impeller 3 deviating.

[0064] The multiple spiral structures inside the bearing 5 serve a cooling function. When the conveying medium flows inside the isolation sleeve 7, some of the conveying medium enters the spiral flow channel inside the bearing 5 and flows along it, allowing the conveying medium to carry away the frictional heat generated by the bearing 5 during operation. This prevents the bearing 5 from undergoing thermal deformation and causing it to rotate eccentrically around the pump shaft 4. Eccentric rotation of the bearing 5 can easily cause eccentric rotation of the inner magnetic frame 6, which in turn causes wear and scraping of the inner wall of the isolation sleeve 7 by the inner magnetic frame 6, which can easily lead to wear and leakage of the isolation sleeve 7. This ensures the stable rotation of the inner magnetic frame 6 and extends the service life of the equipment.

[0065] The shaft support ensures sufficient mechanical strength for the support structure of the pump shaft 4 and impeller 3. The guide plate on the shaft support has a streamlined flow guiding design. Its flow guiding structure can optimize the flow field distribution at the liquid inlet 11, effectively suppress the generation of turbulence and vortex at the liquid inlet, thereby reducing inlet hydraulic loss, improving the stability of the conveyed medium introduction, and ultimately helping to improve the head, flow rate and overall operating efficiency of the magnetic drive pump.

[0066] The remaining structure is the same as that in Example 1.

[0067] Example 3, referring to Figures 4-10 This is the third embodiment of the present invention, which differs from the second embodiment in that:

[0068] The outer wall of the isolation sleeve 7 is provided with a sealing cover 73 that is adapted to the cavity at the corresponding position. The sealing cover 73 is sealed and connected to the opening of the cavity. A sealing ring is provided at the connection between the sealing cover 73 and the isolation sleeve 7.

[0069] The inner and outer sides of the excitation winding 21 are covered with a sealing insulation layer and filled with epoxy resin.

[0070] Multiple sealing rings are fitted on the end of the excitation winding 21 that is close to the rear cover 2.

[0071] The end of the isolation sleeve 7 that connects to the front cover 1 has a raised edge, and a sealing ring is provided on one side of the raised edge.

[0072] During use, the sealing cover 73 is used to keep the cavity on one side of the isolation sleeve 7 sealed. Even after the cavity and the inner wall of the isolation sleeve 7 are partially worn, the sealing cover 73 and the sealing ring between the sealing cover 73 and the isolation sleeve 7 can still prevent the conveying medium from leaking into the rear cover 2, ensuring the safety of the equipment in the subsequent conveying process.

[0073] The excitation winding 21 is a tin-steel sheet enameled wire winding. The sealing insulation layer on the outside of the excitation winding 21 and the epoxy resin filling the inside and outside of the excitation winding 21 can effectively prevent the excitation winding 21 from being damaged by corrosive media after leakage, thereby greatly improving electrical safety and reducing maintenance costs and accident risks.

[0074] Multiple sealing rings fitted on the end of the excitation winding 21 that is close to the rear cover 2 are used to prevent moisture or other impurities from entering the interior of the rear cover 2, thereby avoiding insulation degradation, corrosion or short circuit of the excitation winding 21. At the same time, they ensure the stability of the rotating electromagnetic field strength generated by the excitation winding 21, ensuring stable magnetic coupling between the excitation winding 21 and the permanent magnet 61, and ensuring the stable operation of the equipment.

[0075] The end of the isolation sleeve 7 connected to the front cover 1 has a raised edge, and a sealing ring is provided on one side of the raised edge. The sealing ring is used to ensure the sealing of the pump cavity between the front cover 1 and the isolation sleeve 7, effectively preventing air infiltration or media leakage, thereby ensuring the stability of the pressure conditions in the pump cavity and providing a basis for maintaining a constant delivery flow.

[0076] The remaining structure is the same as that in Example 2.

[0077] Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Those skilled in the art, based on a study of the drawings, specification, and claims, should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to identify names rather than to indicate any particular order. No reference numerals in the claims should be construed as limiting the scope of protection. The functionality of multiple parts appearing in the claims can be implemented by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A leak-proof, shaft-sealed, magnetically driven pump, characterized in that: It includes a front cover (1) and a rear cover (2) connected by bolts. The rear cover (2) is provided with an excitation winding (21). The front cover (1) is rotatably provided with an inner magnetic frame (6). Multiple permanent magnets (61) are fixed inside the inner magnetic frame (6). An impeller (3) is fixedly connected to one end of the inner magnetic frame (6). An isolation sleeve (7) is provided between the inner magnetic frame (6) and the excitation winding (21). The outer wall of the isolation sleeve (7) is provided with a cavity, and a temperature sensor (71) is provided in the cavity. The detection probe of the temperature sensor (71) is covered with a layer of heat insulation cotton (72). The rear cover (2) is provided with a resistance wire coil (231), a slide rod (232) electrically connected to the excitation winding (21), and an elastic slide piece (233) slidably connected between the slide rod (232) and the resistance wire coil (231), as well as a clamping mechanism for clamping the slide rod (232) and a lifting mechanism for pushing the elastic slide piece (233); When the temperature sensor (71) detects that the temperature reaches the first threshold, the clamping mechanism clamps the slide bar (232) to lock the position of the elastic slide (233). Then, when the temperature continues to rise to the second threshold, the lifting mechanism pushes the elastic slide (233) to separate from the resistance wire coil (231).

2. The leak-proof, shaft-sealed, magnetically driven pump according to claim 1, characterized in that: The number of the multiple permanent magnets (61) and the excitation windings (21) is even. The multiple permanent magnets (61) and the excitation windings (21) are evenly distributed around the axis of the isolation sleeve (7). The electromagnetic field generated by the excitation windings (21) after being energized interacts with the magnetic field of the multiple permanent magnets (61), thereby driving the inner magnetic frame (6) to drive the impeller (3) to rotate.

3. A leak-proof, shaft-sealed, magnetically driven pump according to claim 1, characterized in that: The outer wall of the isolation sleeve (7) is provided with a sealing cover (73) that is adapted to the cavity at the corresponding position, and the sealing cover (73) is sealed and connected to the opening of the cavity.

4. A leak-proof, shaftless, magnetically driven pump according to claim 1, characterized in that: The front cover (1) has a fixed shaft frame inside, and a pump shaft (4) is inserted between the shaft frame and the isolation sleeve (7). A bearing (5) is rotatably sleeved on the outside of the pump shaft (4). The inner magnetic frame (6) is fixed on the outside of the bearing (5). A spiral flow channel is provided on the inside of the bearing (5).

5. A leak-proof, shaftless, magnetically driven pump according to claim 1, characterized in that: The front cover (1) is provided with an inlet (11) and an outlet (12) on the outside. The inlet (11) is located on one side of the center position of the impeller (3), and the outlet (12) is located in the extension direction of one of the tangents of the impeller (3).

6. A leak-proof, shaftless, magnetically driven pump according to claim 1, characterized in that: The rear cover (2) is provided with a junction box (22). The resistance wire coil (231), the slide rod (232) and the elastic slide plate (233) are all located inside the junction box (22). A slider (23) is slidably connected to the outside of the slide rod (232). One end of the slider (23) extends to the outside of the junction box (22). The elastic slide plate (233) is fixedly connected to the slider (23).

7. A leak-proof, shaft-seal-free magnetically driven pump according to claim 6, characterized in that: The clamping mechanism includes two clamping blocks (236) symmetrically slidably connected within the slider (23), and the two clamping blocks (236) are respectively located on both sides of the slide rod (232). Anti-slip pads are fixed on the clamping sides of the two clamping blocks (236), and a first spring (2361) is connected between the two clamping blocks (236).

8. A leak-proof, shaft-sealed, magnetically driven pump according to claim 7, characterized in that: The lifting mechanism includes a pressure plate (238) slidably disposed in the slider (23) and a rotating plate (235) rotatably connected to the slider (23). A second spring (2381) is fixedly connected between the pressure plate (238) and the slider (23). A groove is provided on one side of the pressure plate (238). One end of the rotating plate (235) is slidably fitted in the groove. A flexible heat-conducting film (234) is fixedly connected between the other end of the rotating plate (235) and the elastic slide (233).

9. A leak-proof, shaft-seal-free magnetically driven pump according to claim 8, characterized in that: The slider (23) is slidably connected to a U-shaped pusher (237). The pusher (237) has inclined surfaces that slide and cooperate with each other at both ends and on the two clamps (236). The two ends of the pusher (237) can be moved to abut against one side of the pressure plate (238) and push the pressure plate (238) to move.

10. A leak-proof, shaftless, magnetically driven pump according to claim 9, characterized in that: An electric push rod (239) is fixedly installed inside the slider (23), and the telescopic end of the electric push rod (239) is fixedly connected to the push frame (237).

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