A multi-stage magnetic pump

Abstract

The present invention discloses a multi-stage magnetic pump, which relates to the technical field of pump equipment and now proposes the following scheme, which includes multiple cylinders, water inlet pipes and drain pipes, a partition plate is rotatably connected to the mounting frame in the water inlet pipe, one end of the ejection end block is connected to a balancing pipe sleeve, the balancing pipe sleeve is connected to a fixed disk, a sliding disk is installed on the drive shaft, a top block and a memory spring are connected to the fixed disk, one end of the balancing pipe sleeve is provided with a driving pipe sleeve, one end of the driving pipe sleeve is connected to a motor, a first magnetic ring is installed on the output shaft of the motor, a second magnetic ring is installed on the mounting pipe, and a turbine is installed on the mounting pipe; the present invention blocks the drain pipe by closing the partition plate, and when backflow occurs, the liquid impacts the partition plate, thereby forming a deceleration protection, and when the reflux pipe is blocked, the sliding disk will conflict with the fixed disk, and under friction, the high temperature causes the memory spring to expand and extend, the top block extends and makes a sound, so that it can quickly determine that the pump has a fault, and the turbine realizes diversion, which is convenient for heat dissipation and cooling.

Description

Technical Field

[0001] The present invention relates to the technical field of pump equipment, and in particular to a multi-stage magnetic pump. Background Art

[0002] Multi-stage magnetic drive pumps are widely used in the chemical, pharmaceutical, electric power, and food industries. They are characterized by their leak-free, pollution-free, safe, reliable, and long service life. They primarily consist of a pump body, motor, magnetic actuator, and sliding bearings. The magnetic actuator, the core component of the magnetic drive pump, consists of an inner magnetic rotor, an outer magnetic rotor, and a spacer sleeve. Through magnetic force, it transmits the motor's rotational motion to the pump shaft, thereby driving its rotation.

[0003] After searching, the Chinese invention patent, announcement number: CN117646727B, named: A vertical multi-stage magnetic pump, the invention adopts a forced reverse circulation structure, adds blades outside the outer magnetic rotor, forces the circulating fluid to circulate, takes away the eddy current heat of the magnetic actuator, and also changes the pressure-bearing mode of the isolation sleeve, changing the isolation sleeve from being subjected to internal pressure to being subjected to external pressure, thereby increasing the compressive strength of the isolation sleeve and improving the safety performance of the pump.

[0004] However, in actual use, the above and similar technical solutions still have some problems:

[0005] 1. When using blades to dissipate heat from the magnetic ring rotor, the blades can only stir the surrounding liquid flow. However, the stirred liquid tends to circulate and accumulate in a specific area, making it difficult for the hot liquid to be quickly discharged, which in turn makes it difficult for the cooling system to achieve ideal heat dissipation efficiency.

[0006] 2. This type of pump body must strictly follow the specific operating sequence of valves and pump body switches during operation to avoid damage to the impeller caused by water hammer. However, in the event of a sudden power outage, the valve cannot be closed in time, and water flows back into the impeller, increasing the risk of damage to the pump body;

[0007] 3. When the sliding disc is used to balance the axial force, it is difficult to determine in real time whether the return pipe is blocked. Once the return pipe is blocked, the sliding disc will be in a state of conflict and friction with the fixed disc for a long time. Over time, the sliding disc is very likely to be damaged due to excessive wear. Summary of the Invention

[0008] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a multi-stage magnetic pump that is easy to judge whether the sliding disk is rubbing for a long time, to dissipate heat to the magnetic ring rotor, and to prevent the reflux liquid from hitting the impeller.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A multi-stage magnetic pump, comprising a plurality of cylinders, a plurality of which are connected to a pumping mechanism, the pumping mechanism comprising a water inlet end block and a discharge end block, a water inlet end block and a discharge end block being provided at both ends of the plurality of cylinders, a water inlet end block and a discharge end block being respectively installed with a communicating water inlet pipe and a drain pipe, the water inlet end block, the plurality of cylinders and the discharge end block being fixed by bolts, the plurality of cylinders being internally connected to a drive shaft for rotation, the drive shaft being located inside each cylinder and being installed with an impeller, the discharge end block being connected to a balancing mechanism, and the balancing mechanism being connected to a drive mechanism;

[0011] The water inlet pipe and the drain pipe are connected with a protective mechanism, which includes a connecting pipe. A connecting pipe is installed between the water inlet pipe and the drain pipe. Mounting frames are installed inside the water inlet pipe and the drain pipe. A partition plate is rotatably connected to the mounting frame located inside the drain pipe.

[0012] Preferably, the mounting frame is provided with a through hole, the water inlet pipe and the drain pipe are connected to the connecting pipe through the through hole, the partition plate is located between the through hole and the ejection end block, and the partition plate is rotated on the mounting frame close to one end of the connecting pipe.

[0013] Preferably, a moving rod is provided inside the connecting pipe, a support block is installed inside the connecting pipe, the moving rod is slidably connected to the support block, a connecting rod is rotatably connected between the moving rod and the partition plate, and a first spring is installed between the moving rod and the support block.

[0014] Preferably, a baffle is fixedly connected to the mounting bracket located inside the water inlet pipe, and the baffle is in a slide-shaped structure. The baffle is arranged at the through hole of the mounting bracket, and the slide-shaped opening of the baffle faces the water inlet end block. The end of the movable rod slides through the baffle and is fixedly connected to a guide plate, and the guide plate is in an arc-shaped structure at one end close to the baffle.

[0015] Preferably, the balancing mechanism includes a balancing pipe sleeve, a balancing pipe sleeve is fixed to one end of the ejection end block by bolts, a connected water inlet hole is provided between the balancing pipe sleeve and the ejection end block, a fixed plate is fixed to one end of the balancing pipe sleeve close to the water inlet hole by bolts, a sliding plate is installed on the drive shaft, the sliding plate is fitted with the fixed plate, and a connected return pipe is installed between the balancing pipe sleeve and the water inlet end block.

[0016] Preferably, the sliding disk is connected to a warning mechanism, and the warning mechanism includes a fixing ring, a fixing ring is installed on the sliding disk, and a resistance ring is provided at one end of the fixing ring close to the fixed disk, and a plurality of pillars are installed between the fixing ring and the resistance ring, and the resistance ring is rotatably connected to the outer edge of the fixed disk, and a heat conducting block is inserted on the outer edge of the fixed disk, and the heat conducting block is fixed to the fixed disk by bolts, and a resistance groove is provided on the inner wall of the resistance ring, and an embedded top block is slidably connected to the heat conducting block, and a memory spring is installed between the top block and the heat conducting block.

[0017] Preferably, the interference groove is arc-shaped, the protruding end of the top block is arc-shaped, and the top block interferes with the inner wall of the interference ring.

[0018] Preferably, a mounting ring is installed on the inner wall of the balancing pipe sleeve, the mounting ring is hollow, the inner wall of the mounting ring is rotatably connected to the second sliding sleeve, the inner wall of the water inlet end block is rotatably connected to the first sliding sleeve, and the drive shaft is slidably connected to the second sliding sleeve and the first sliding sleeve.

[0019] Preferably, the driving mechanism includes a driving sleeve, a driving sleeve is provided at one end of the balancing sleeve, a spacer sleeve is installed between the driving sleeve and the balancing sleeve, the driving sleeve, the spacer sleeve and the balancing sleeve are fixed by bolts, a motor is fixed to one end of the driving sleeve by bolts, the output shaft of the motor extends into the interior of the driving sleeve and is installed with a first magnetic ring, a mounting tube is installed at one end of the second sliding sleeve, a second magnetic ring is installed on the mounting tube, and the first magnetic ring, the spacer sleeve and the second magnetic ring are movably connected.

[0020] Preferably, a turbine is mounted on the mounting tube, a water inlet hole is provided on the mounting tube, the spacer is connected to the turbine via the water inlet hole, and a plurality of arc-shaped guide grooves are provided on the inner wall of the spacer.

[0021] Compared with the prior art, the present invention provides a multi-stage magnetic pump with the following beneficial effects:

[0022] 1. This multi-stage magnetic pump pushes the partition plate to flip upward when the liquid is pumped out, thereby facilitating the liquid pumping out. When the power is suddenly cut off, the impeller stops working, and the flow is cut off at the drain pipe. The liquid inside the pipe will form a backflow, forming a water hammer, which will impact the water pump impeller. At this time, the liquid inside the cylinder is no longer pumped out. Under the action of the first spring, the moving rod is pushed to reset, and the partition plate is pushed closed by the connecting rod, thereby blocking the drain pipe. When backflowing, the liquid impacts the partition plate, thereby forming a deceleration protection to prevent the liquid from directly impacting the impeller and causing damage to the impeller, thereby protecting the water pump.

[0023] 2. In this multi-stage magnetic pump, liquid enters the water inlet hole, pushing the sliding disc away from the impeller to move, thereby balancing the radial force generated by the impeller. When the return pipe is blocked, the liquid inside the balance pipe sleeve will not be able to be discharged, its internal pressure increases, and the sliding disc will conflict with the fixed disc. Under friction, the temperature of the fixed disc increases, and the temperature of the heat conduction block increases, thereby causing the memory spring to expand and elongate, pushing the top block to extend, and the arc-shaped end of the top block will conflict with the inner wall of the conflict ring, thereby causing friction. The inner wall of the conflict ring is provided with a conflict groove. When the top block passes over the conflict groove, a collision sound will occur, and the sound is transmitted to the outside of the pump body. When the pump hears a dripping sound, it can be quickly determined that the pump has a fault, avoiding damage to the pump caused by long-term operation under a fault.

[0024] 3. The multi-stage magnetic pump is equipped with a turbine on the mounting pipe. During the pumping process, the turbine rotates, and the liquid entering the balance pipe sleeve will be driven by the turbine. The liquid flows into the water diversion hole, and then enters the interior of the spacer, cooling the spacer and the second magnetic ring. The liquid can be quickly discharged through the guide groove, thereby taking away the heat. Under the isolation of the turbine, most of the liquid entering the balance pipe sleeve will be intercepted, enter the other side through the water diversion hole and the guide groove, and then be discharged through the return pipe, thus forming a one-way pipeline, which is conducive to heat discharge, thereby playing an efficient heat dissipation and cooling role. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a three-dimensional view of a multi-stage magnetic pump proposed in Example 1 of the present invention;

[0026] Figure 2 This is a view of the connecting pipe connection structure of Example 1 of the present invention;

[0027] Figure 3 This is a view of a partition board connection structure according to a first embodiment of the present invention;

[0028] Figure 4 This is a view of a spacer connection structure according to a third embodiment of the present invention;

[0029] Figure 5 A view of the second magnetic ring connection structure of the third embodiment of the present invention;

[0030] Figure 6 This is a view of a turbine connection structure according to a third embodiment of the present invention;

[0031] Figure 7 This is a view of a balancing pipe sleeve connection structure according to a second embodiment of the present invention;

[0032] Figure 8 This is a view of a fixing ring connection structure according to a second embodiment of the present invention;

[0033] Figure 9 This is a view of the heat conducting block connection structure of the second embodiment of the present invention.

[0034] In the figure: 1. Cylinder; 2. Pumping mechanism; 21. Discharge end block; 22. Water inlet pipe; 23. Drain pipe; 24. Return pipe; 25. Water inlet end block; 26. First sliding sleeve; 27. Drive shaft; 28. Impeller; 29. ​​Second sliding sleeve; 3. Protective mechanism; 31. Connecting pipe; 32. Mounting frame; 33. Moving rod; 34. Support block; 35. First spring; 36. Baffle; 37. Guide plate; 38. Partition plate; 39. Connecting rod; 4. Balancing mechanism ;41. Balance pipe sleeve;42. Fixed disk;43. Water inlet hole;44. Sliding disk;5. Driving mechanism;51. Motor;52. Driving pipe sleeve;53. Spacer;54. First magnetic ring;55. Second magnetic ring;56. Mounting pipe;57. Guide groove;58. Turbine;59. Water diversion hole;6. Mounting ring;7. Warning mechanism;71. Fixed ring;72. Pillar;73. Contact ring;74. Contact groove;75. Heat transfer block;76. Top block;77. Memory spring. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0037] Example 1: Reference Figures 1-9A multi-stage magnetic pump includes multiple cylinders 1, multiple cylinders 1 are connected to a pumping mechanism 2, the pumping mechanism 2 includes a water inlet end block 25 and a discharge end block 21, the two ends of the multiple cylinders 1 are respectively provided with a water inlet end block 25 and a discharge end block 21, the water inlet end block 25 and the discharge end block 21 are respectively installed with a connected water inlet pipe 22 and a drain pipe 23, the water inlet end block 25, the multiple cylinders 1 and the discharge end block 21 are fixed by bolts, the multiple cylinders 1 are internally connected to the drive shaft 27, the drive shaft 27 is located inside each cylinder 1 and an impeller 28 is installed, so that the impeller 2 is driven by the drive shaft 27 8 rotates, thereby facilitating the transportation of liquid, the ejection end block 21 is connected to a balancing mechanism 4, the balancing mechanism 4 is connected to a driving mechanism 5, the water inlet pipe 22 and the drain pipe 23 are connected to a protective mechanism 3, the protective mechanism 3 includes a connecting pipe 31, a connecting pipe 31 is installed between the water inlet pipe 22 and the drain pipe 23, a mounting bracket 32 ​​is installed inside the water inlet pipe 22 and the drain pipe 23, and a partition plate 38 is rotatably connected to the mounting bracket 32 ​​located inside the drain pipe 23, so that when the pump stops working, the backflow of liquid is blocked to prevent the backflow of liquid from hitting the impeller 28, thereby protecting the impeller 28.

[0038] In the present invention, a through hole is provided on the mounting frame 32, and the water inlet pipe 22 and the drain pipe 23 are connected to the connecting pipe 31 through the through hole. The partition plate 38 is located between the through hole and the ejection end block 21. The partition plate 38 is rotated on the mounting frame 32 close to one end of the connecting pipe 31, thereby facilitating the discharge of the backflowing liquid.

[0039] In the present invention, a moving rod 33 is provided inside the connecting pipe 31, and a support block 34 is installed inside the connecting pipe 31. The moving rod 33 is slidably connected to the support block 34. A connecting rod 39 is rotatably connected between the moving rod 33 and the partition plate 38. A first spring 35 is installed between the moving rod 33 and the support block 34, so that the moving rod 33 can push the partition plate 38 to reset.

[0040] In the present invention, a baffle 36 is fixedly connected to the mounting frame 32 located inside the water inlet pipe 22. The baffle 36 has a slide-shaped structure. The baffle 36 is arranged at the through hole of the mounting frame 32. The slide-shaped opening of the baffle 36 faces the water inlet end block 25. The end of the movable rod 33 slides through the baffle 36 and is fixedly connected to a guide plate 37. The guide plate 37 has an arc-shaped structure at one end close to the baffle 36, so that when pumping out the liquid, the guide plate 37 can pull the partition plate 38 to an open state.

[0041] Example 2: Based on Example 1, a multi-stage magnetic pump, the balancing mechanism 4 includes a balancing sleeve 41, one end of the ejection end block 21 is fixed with the balancing sleeve 41 by bolts, a connected water inlet hole 43 is provided between the balancing sleeve 41 and the ejection end block 21, the end of the balancing sleeve 41 close to the water inlet hole 43 is fixed with a fixed disk 42 by bolts, a sliding disk 44 is installed on the drive shaft 27, the sliding disk 44 is fitted with the fixed disk 42, and a connected return pipe 24 is installed between the balancing sleeve 41 and the water inlet end block 25, so as to facilitate balancing the axial force generated by the impeller 28 through the sliding disk 44.

[0042] In the present invention, the sliding disk 44 is connected to the warning mechanism 7, which includes a fixing ring 71. The sliding disk 44 is provided with a fixing ring 71. The fixing ring 71 is provided with a resistance ring 73 at one end close to the fixed disk 42. A plurality of pillars 72 are installed between the fixing ring 71 and the resistance ring 73, so that the liquid can be discharged from between the plurality of pillars 72. The resistance ring 73 is rotatably connected to the outer edge of the fixed disk 42. A heat conducting block 75 is inserted on the outer edge of the fixed disk 42. The heat conducting block 75 is fixed to the fixed disk 42 by bolts. The inner wall of the resistance ring 73 is provided with a resistance groove 74. The heat conducting block 75 is slidably connected with an embedded A memory spring 77 is installed between the top block 76 and the heat-conducting block 75. The memory spring 77 is made of an alloy. The alloy (such as nickel-titanium alloy) can be plastically deformed at low temperatures. When heated to a critical temperature (austenite transformation point), the lattice structure is reorganized and restored to its original shape, thereby achieving the characteristics of elongation at high temperatures and contraction at low temperatures. When the reflux pipe 24 is blocked, the sliding disk 44 will not be able to balance the axial force, and the sliding disk 44 will rub against the fixed disk 42, thereby causing the fixed disk 42 to heat up. The deformation of the memory spring 77 can push the top block 76, thereby colliding with the conflict ring 73 and making a sound, thereby facilitating a fault prompt.

[0043] In the present invention, the abutment groove 74 is arc-shaped, the protruding end of the top block 76 is arc-shaped, and the top block 76 abuts against the inner wall of the abutment ring 73, thereby protecting the top block 76 and reducing wear.

[0044] In the present invention, a mounting ring 6 is installed on the inner wall of the balancing pipe sleeve 41, and the mounting ring 6 is hollow. The inner wall of the mounting ring 6 is rotatably connected to the second sliding sleeve 29, and the inner wall of the water inlet end block 25 is rotatably connected to the first sliding sleeve 26. The drive shaft 27 is slidably connected to the second sliding sleeve 29 and the first sliding sleeve 26, thereby ensuring the stable movement of the drive shaft 27.

[0045] Example 3: On the basis of Example 2, a multi-stage magnetic pump, the driving mechanism 5 includes a driving sleeve 52, a driving sleeve 52 is provided at one end of the balancing sleeve 41, a spacer sleeve 53 is installed between the driving sleeve 52 and the balancing sleeve 41, the driving sleeve 52, the spacer sleeve 53 and the balancing sleeve 41 are fixed by bolts, a motor 51 is fixed to one end of the driving sleeve 52 by bolts, the output shaft of the motor 51 extends into the interior of the driving sleeve 52 and is installed with a first magnetic ring 54, a mounting tube 56 is installed at one end of the second sliding sleeve 29, a second magnetic ring 55 is installed on the mounting tube 56, the first magnetic ring 54, the spacer sleeve 53 and the second magnetic ring 55 are movably connected, so as to facilitate the use of magnetic force for power transmission.

[0046] In the present invention, a turbine 58 is installed on the mounting tube 56, and a water inlet hole 59 is provided on the mounting tube 56. The spacer 53 is connected to the turbine 58 through the water inlet hole 59. The inner wall of the spacer 53 is provided with multiple arc-shaped guide grooves 57, thereby promoting liquid flow and increasing the heat dissipation effect.

[0047] Working principle: When pumping liquid, connect the pipeline with the water inlet pipe 22 and the drain pipe 23, first inject part of the liquid into the cylinder 1, start the motor 51, and the motor 51 works, driving the first magnetic ring 54 to rotate, which is separated by the spacer 53 and drives the second magnetic ring 55 to rotate, thereby driving the mounting pipe 56 and the second sliding sleeve 29 to rotate, thereby driving the drive shaft 27 to rotate, and the drive shaft 27 drives the impeller 28 to rotate, thereby forming a negative pressure at the outlet of the water inlet pipe 22, so that the liquid is pumped into the inside of the water inlet pipe 22, and then pumped out from the drain pipe 23 through the drive of the impeller 28, thereby completing the liquid delivery work. When the liquid is pumped out, the partition plate 38 is pushed to flip upward. When the liquid is pumped out, the partition plate 38 pushes the moving rod 33 to slide through the connecting rod 39, and the first spring 35 is compressed. One side of the partition plate 38 is tightly in contact with the mounting bracket 32, thereby blocking the connecting pipe 31, and the guide plate 37 slides to the middle of the mounting bracket 32. One side of the guide plate 37 is arc-shaped, thereby Under the Bernoulli principle, the incoming liquid pushes the guide plate 37 to move toward the end away from the connecting pipe 31, thereby tightening the partition plate 38 through the moving rod 33 to prevent the partition plate 38 from rotating. The baffle 36 plays a diversion role to prevent the liquid from pouring into the connecting pipe 31. When the power is suddenly cut off, the impeller 28 stops working, the drainage pipe 23 is cut off, and the liquid inside the pipe will form a backflow, forming a water hammer, thereby impacting the water pump impeller 28. At this time, the liquid inside the cylinder 1 is no longer pumped out. Under the action of the first spring 35, the moving rod 33 is pushed to reset, and the partition plate 38 is pushed closed by the connecting rod 39, thereby blocking the drainage pipe 23. When backflowing, the liquid impacts the partition plate 38, thereby forming a deceleration protection to prevent the liquid from directly impacting the impeller 28 and causing damage to the impeller 28. The decelerated liquid can enter the interior of the connecting pipe 31, and then be discharged into the interior of the water inlet pipe 22 through the baffle 36, so as to facilitate backflow through the water inlet pipe 22, thereby protecting the water pump.

[0048] During the pumping process, the pressure inside the ejection end block 21 increases, and part of the liquid enters the water inlet hole 43, pushing the sliding plate 44 away from the impeller 28 to move, thereby balancing the radial force generated by the impeller 28. The liquid entering the balance pipe sleeve 41 will enter the return pipe 24 under pressure, and enter the water inlet end block 25 through the return pipe 24, thereby circulating to ensure the movement of the sliding plate 44. When the return pipe 24 is blocked, the liquid inside the balance pipe sleeve 41 will not be able to be discharged, its internal pressure increases, and the sliding plate 44 The fixing plate 42 will come into contact with the fixing plate 42 under friction, and the temperature of the fixing plate 42 and the temperature of the heat conducting block 75 will increase, thereby causing the memory spring 77 to expand and extend, pushing the top block 76 to extend. The arc-shaped end of the top block 76 will come into contact with the inner wall of the contact ring 73, thereby generating friction. The inner wall of the contact ring 73 is provided with a contact groove 74. When the top block 76 passes over the contact groove 74, a knocking sound will be generated, and the sound will be transmitted to the outside of the pump body. When the pump makes a dripping sound, it can be quickly determined that the pump has failed, thus avoiding damage to the pump caused by long-term operation under a fault.

[0049] A turbine 58 is installed on the mounting pipe 56. During the pumping process, the turbine 58 rotates, and the liquid entering the balancing pipe sleeve 41 will be driven by the turbine 58. The liquid flows into the water inlet hole 59, and then enters the interior of the spacer 53, cooling the spacer 53 and the second magnetic ring 55. The liquid can be quickly discharged through the guide groove 57, thereby taking away the heat. Under the isolation of the turbine 58, most of the liquid entering the balancing pipe sleeve 41 will be intercepted, enter the other side through the water inlet hole 59 and the guide groove 57, and then be discharged through the return pipe 24, thereby forming a one-way pipeline, which is conducive to heat discharge, thereby achieving an efficient heat dissipation and cooling effect.

[0050] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A multi-stage magnetic pump, comprising a plurality of cylinders (1), wherein the plurality of cylinders (1) are connected to pumping mechanisms (2), characterized in that: The pumping mechanism (2) includes a water inlet end block (25) and a discharge end block (21), and the two ends of the plurality of cylinders (1) are respectively provided with a water inlet end block (25) and a discharge end block (21), and the water inlet end block (25) and the discharge end block (21) are respectively installed with a connected water inlet pipe (22) and a drain pipe (23), and the water inlet end block (25), the plurality of cylinders (1) and the discharge end block (21) are fixed by bolts, and the plurality of cylinders (1) are internally connected to a drive shaft (27) for rotation, and the drive shaft (27) is located inside each cylinder (1) and is installed with an impeller (28), and the discharge end block (21) is connected to a balancing mechanism (4), and the balancing mechanism (4) is connected to a driving mechanism (5); The water inlet pipe (22) and the drain pipe (23) are connected to a protective mechanism (3), the protective mechanism (3) comprising a connecting pipe (31), a connecting pipe (31) being installed between the water inlet pipe (22) and the drain pipe (23), a mounting frame (32) being installed inside the water inlet pipe (22) and the drain pipe (23), a partition plate (38) being rotatably connected to the mounting frame (32) located inside the drain pipe (23); The mounting frame (32) is provided with a through hole, the water inlet pipe (22) and the drain pipe (23) are connected to the connecting pipe (31) through the through hole, the partition plate (38) is located between the through hole and the ejection end block (21), and the partition plate (38) is rotated on the mounting frame (32) at one end close to the connecting pipe (31); A moving rod (33) is provided inside the connecting pipe (31), a support block (34) is installed inside the connecting pipe (31), the moving rod (33) is slidably connected to the support block (34), a connecting rod (39) is rotatably connected between the moving rod (33) and the partition plate (38), and a first spring (35) is installed between the moving rod (33) and the support block (34); A baffle (36) is fixedly connected to the mounting frame (32) located inside the water inlet pipe (22). The baffle (36) has a slide-shaped structure. The baffle (36) is arranged at a through hole of the mounting frame (32). The slide-shaped opening of the baffle (36) faces the water inlet end block (25). The end of the moving rod (33) slides through the baffle (36) and is fixedly connected to a guide plate (37). The guide plate (37) has an arc-shaped structure at one end close to the baffle (36).

2. A multi-stage magnetic pump according to claim 1, characterized in that: The balancing mechanism (4) includes a balancing pipe sleeve (41), one end of the ejection end block (21) is fixed with the balancing pipe sleeve (41) by means of bolts, a water inlet hole (43) is provided between the balancing pipe sleeve (41) and the ejection end block (21), one end of the balancing pipe sleeve (41) close to the water inlet hole (43) is fixed with a fixed disk (42) by means of bolts, a sliding disk (44) is installed on the drive shaft (27), the sliding disk (44) is fitted with the fixed disk (42), and a return pipe (24) is installed between the balancing pipe sleeve (41) and the water inlet end block (25).

3. A multi-stage magnetic pump according to claim 2, characterized in that: The sliding disk (44) is connected to a warning mechanism (7), and the warning mechanism (7) includes a fixing ring (71). The sliding disk (44) is provided with a fixing ring (71). The fixing ring (71) is provided with a resistance ring (73) at one end close to the fixed disk (42). A plurality of pillars (72) are installed between the fixing ring (71) and the resistance ring (73). The resistance ring (73) is rotatably connected to the outer edge of the fixed disk (42). A heat conducting block (75) is inserted on the outer edge of the fixed disk (42). The heat conducting block (75) is fixed to the fixed disk (42) by bolt locking. The inner wall of the resistance ring (73) is provided with a resistance groove (74). An embedded top block (76) is slidably connected to the heat conducting block (75), and a memory spring (77) is installed between the top block (76) and the heat conducting block (75).

4. A multi-stage magnetic pump according to claim 3, characterized in that: The abutment groove (74) is arc-shaped, the protruding end of the top block (76) is arc-shaped, and the top block (76) abuts against the inner wall of the abutment ring (73).

5. A multi-stage magnetic pump according to claim 2, characterized in that: The inner wall of the balancing pipe sleeve (41) is provided with a mounting ring (6), the mounting ring (6) being hollowed out, the inner wall of the mounting ring (6) being rotatably connected to a second sliding sleeve (29), the inner wall of the water inlet end block (25) being rotatably connected to a first sliding sleeve (26), and the drive shaft (27) being slidably connected to the second sliding sleeve (29) and the first sliding sleeve (26).

6. A multi-stage magnetic pump according to claim 5, characterized in that: The driving mechanism (5) includes a driving sleeve (52), one end of the balancing sleeve (41) is provided with a driving sleeve (52), a spacer sleeve (53) is installed between the driving sleeve (52) and the balancing sleeve (41), the driving sleeve (52), the spacer sleeve (53) and the balancing sleeve (41) are fixed by bolts, one end of the driving sleeve (52) is fixed with a motor (51) by bolts, the output shaft of the motor (51) extends into the interior of the driving sleeve (52) and is installed with a first magnetic ring (54), one end of the second sliding sleeve (29) is installed with a mounting tube (56), a second magnetic ring (55) is installed on the mounting tube (56), and the first magnetic ring (54), the spacer sleeve (53) and the second magnetic ring (55) are movably connected.

7. A multi-stage magnetic pump according to claim 6, characterized in that: A turbine (58) is mounted on the mounting tube (56), a water inlet hole (59) is provided on the mounting tube (56), the spacer (53) is connected to the turbine (58) through the water inlet hole (59), and a plurality of arc-shaped guide grooves (57) are provided on the inner wall of the spacer (53).

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