A magnetically driven radial flow multistage centrifugal pump

Abstract

This invention belongs to the field of centrifugal pump technology, specifically a magnetically driven radial flow multistage centrifugal pump, including a main shaft; multiple uniformly arranged impellers are fixedly connected to the surface of the main shaft; the multiple impellers are divided into two groups, and the impellers in these two groups are installed in opposite directions; multiple uniformly arranged pump casings are provided on the outer side of each of the two groups of impellers; a connecting ring is provided between the two pump casings; a water outlet pipe is fixedly connected to the top of the connecting ring. The axial forces applied to the main shaft by the two groups of impellers are opposite, and the number and size of the two groups of impellers are the same. Thus, a pair of forces of the same magnitude but opposite direction are applied to the main shaft, thereby balancing the force on the main shaft in the axial direction. This avoids damage to the bearings at both ends of the main shaft due to long-term pressure caused by uneven axial force, and also reduces the axial movement of the main shaft, making the impeller rotation more stable, thus making the liquid transportation more efficient and the energy utilization more efficient.

Description

Technical Field

[0001] This invention belongs to the field of centrifugal pump technology, specifically a magnetically driven radial flow multistage centrifugal pump. Background Technology

[0002] Centrifugal pumps are often used as the power source for conveying slurries or liquids containing solid particles in industries such as power, metallurgy, coal, and building materials. A centrifugal pump mainly consists of a pump casing and an impeller. Its working principle is that when the impeller rotates at high speed, the liquid is drawn into the center of the impeller and rotates with the impeller under the push of the blades. Due to centrifugal force, the liquid is thrown outward and obtains a very high tangential velocity. After entering the diffuser channel in the pump casing, the velocity energy is converted into pressure energy. As a result, the pressure on the outlet side increases and the liquid is pushed out. At the impeller inlet, a local low pressure is formed because the liquid is thrown away. Under the action of pressure difference, the liquid surface on the suction side continuously replenishes the liquid into the pump to complete the continuous conveying.

[0003] In real-world production, when it is necessary to pump flammable, explosive, toxic, or valuable liquids with a relatively large head, a magnetically driven multistage centrifugal pump is often chosen. The multiple impellers connected in series in the pump can gradually increase the pressure of the pumped liquid, thereby increasing the head. Magnetic drive replaces mechanical seals with force couplers, achieving contactless power transmission, thus avoiding the use of rotating seals. This improves the sealing effect while reducing wear on the seals.

[0004] In the aforementioned technology, when the impeller rotates, the pressure on both sides is asymmetrical, which causes the impeller to exert an axial force on the shaft. Since a multistage centrifugal pump has multiple impellers inside, each impeller will exert an axial force on the shaft, thereby increasing the axial force on the shaft. This not only affects the strength of the shaft itself, but also the bearing at the end of the shaft, thus affecting the service life of the entire pump body.

[0005] Therefore, the present invention provides a magnetically driven radial flow multistage centrifugal pump. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A magnetically driven radial flow multistage centrifugal pump, comprising a main shaft; a plurality of uniformly arranged impellers are fixedly connected to the surface of the main shaft; the plurality of impellers are divided into two groups, and the impellers in these two groups are installed in opposite directions; a plurality of uniformly arranged pump casings are provided on the outer sides of each of the two groups of impellers; a connecting ring is provided between the two pump casings; a water outlet pipe is fixedly connected to the top of the connecting ring; end caps are fixedly connected to both ends of the main shaft, and the two ends of the rotating shaft are rotatably connected to the two end caps respectively; An inner magnetic rotor is installed at one end of the main shaft; a motor is installed at the end of the end cover near the inner magnetic rotor that is away from the shaft; an outer magnetic rotor is fixedly connected to the output shaft of the motor at the corresponding position of the inner magnetic rotor, and the outer magnetic rotor covers the outside of the inner magnetic rotor through the end cover; a water inlet pipe is fixedly connected to the end cover away from the motor; a pair of return holes one is opened on the inner wall of the pump casing near the water inlet pipe on the side of the connecting ring; a pair of return holes two is opened on the inner wall of the pump casing near the motor; a guide hole is opened inside the pump casing and the connecting ring between the return holes one and the return holes two.

[0008] Preferably, a base is fixedly connected to the bottom of the motor; a pair of fixed rods are fixedly connected to the top surface of the base and the side closest to the motor; a movable rod is slidably connected to the top surface of the base and the side away from the fixed rods; a slot is provided on the side of the fixed rod close to the movable rod, and the end of the movable rod close to the slot is adapted to the slot; connecting blocks are fixedly connected to both sides of the pump housing and the end cover; mounting holes are provided on the surface of the connecting blocks, and the mounting holes are adapted to the movable rod and the fixed rods; a nut is threaded onto the surface of the movable rod.

[0009] Preferably, the main shaft includes a secondary shaft one and a secondary shaft two; the secondary shaft one is fixedly connected to the inner magnetic rotor; the ends of the secondary shaft one and the secondary shaft two that are far apart from each other are rotatably connected to two end caps respectively; a transmission block is fixedly connected to the end of the secondary shaft one near the secondary shaft two, and the end face of the transmission block is rectangular; a mating groove is provided at the end of the secondary shaft two near the transmission block, and the mating groove is adapted to the transmission block.

[0010] Preferably, the movable rod has an installation groove at one end near the fixed rod; a baffle is slidably connected inside the installation groove, and the cross-section of the baffle is set in a right-angled triangle; a spring is fixedly connected between the two baffles.

[0011] Preferably, a pair of connecting seats are installed on the top surface of the base; each connecting seat has a support seat on its top surface; the support seat closer to the motor is fixedly connected to the connecting seat at its bottom, while the support seat farther from the motor is slidably connected to the connecting seat at its bottom; a screw is rotatably connected to the top surface of the connecting seat farther from the motor, and the screw is threadedly connected to the support seat; the moving rod is fixed to the end face of the support seat on the side closer to the screw, while the fixing rod is fixed to the end face of the support seat on the side farther from the screw.

[0012] Preferably, the top surface of the support base is provided with a pair of strip grooves; multiple evenly arranged rollers are rotatably connected in both strip grooves, and the rollers are in contact with the pump casing.

[0013] Preferably, the bottom surfaces of both connecting seats are fixedly connected to auxiliary gears, and the auxiliary gears are rotatably connected to the base; the top surface of the base is rotatably connected to a main gear between the two auxiliary gears; toothed plates are slidably connected to both sides of the main gear, and the toothed plates are slidably connected to the base; both toothed plates are meshed with the main gear, and the two toothed plates are respectively meshed with the two auxiliary gears.

[0014] Preferably, the screw end face has a through hole that extends through the entire screw; a slide rod is slidably connected inside the through hole; an insertion hole is provided at the end of the slide rod near the motor; the connecting seat near the motor has a threaded insertion rod on the side near the screw, and the insertion rod is adapted to the insertion hole.

[0015] Preferably, a handle is fixedly connected to the end of the slide rod away from the insertion hole; a pair of insertion plates are fixedly connected to the end of the slide rod near the insertion hole; and a plurality of evenly arranged slots are provided on the end of the screw rod near the insertion plates, and the slots are adapted to the insertion plates.

[0016] Preferably, a pressure ring is threaded to one end of the slide rod near the handle; a plurality of evenly arranged connecting posts are fixed to the side surface of the pressure ring.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The magnetically driven radial flow multistage centrifugal pump of the present invention applies opposite axial forces to the main shaft through two sets of impellers, and the two sets of impellers are identical in number and size. As a result, the main shaft is subjected to a pair of forces of the same magnitude but opposite direction, thereby balancing the forces on the main shaft in the axial direction. This avoids damage to the bearings at both ends of the main shaft due to long-term stress and compression caused by uneven axial forces. At the same time, it reduces the axial movement of the main shaft and makes the impeller rotation more stable, thus making the liquid transportation more efficient and the energy utilization more efficient.

[0019] 2. The magnetically driven radial flow multistage centrifugal pump of the present invention drives the toothed plate to slide through the auxiliary gear, and the sliding toothed plate drives the main gear to rotate, which in turn drives the toothed plate and auxiliary gear on the other side to rotate, thereby realizing that the two connecting seats rotate synchronously in opposite directions by 90 degrees, thus leaving more operating space for the user and reducing the maintenance difficulty for the user. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a schematic diagram of the pump casing structure in this invention;

[0023] Figure 3 This is a cross-sectional view of the pump casing in this invention;

[0024] Figure 4 This is a partial cross-sectional view of the movable rod in this invention;

[0025] Figure 5 This is a schematic diagram of the support base in this invention;

[0026] Figure 6 This is a schematic diagram of the structure of the auxiliary gear in this invention;

[0027] Figure 7 This is a schematic diagram of the insert rod in this invention;

[0028] Figure 8 This is a schematic diagram of the slide bar in this invention.

[0029] In the diagram: 1. Impeller; 2. Pump casing; 3. Connecting ring; 4. Outlet pipe; 5. End cover; 6. Inner magnetic rotor; 7. Motor; 8. Outer magnetic rotor; 9. Inlet pipe; 10. Return hole one; 11. Return hole two; 12. Guide hole; 13. Base; 14. Fixing rod; 15. Moving rod; 16. Slot; 17. Connecting block; 18. Mounting hole; 19. Nut; 20. Secondary shaft one; 21. Secondary shaft two; 2 2. Transmission block; 23. Connecting groove; 24. Mounting groove; 25. Baffle; 26. Spring; 27. Connecting seat; 28. Support seat; 29. ​​Screw; 30. Strip groove; 31. Roller; 32. Secondary gear; 33. Main gear; 34. Gear plate; 35. Through hole; 36. Slide rod; 37. Insertion hole; 38. Insert rod; 39. Handle; 40. Insert plate; 41. Slot; 42. Pressure ring; 43. Connecting column. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] like Figures 1 to 3As shown in the embodiment of the present invention, a magnetically driven radial flow multistage centrifugal pump includes a main shaft; a plurality of uniformly arranged impellers 1 are fixedly connected to the surface of the main shaft; the plurality of impellers 1 are divided into two groups, and the two groups of impellers 1 are installed in opposite directions; a plurality of uniformly arranged pump casings 2 are provided on the outer side of each of the two groups of impellers 1; a connecting ring 3 is provided between the two pump casings 2; a water outlet pipe 4 is fixedly connected to the top of the connecting ring 3; end caps 5 are fixedly connected to both ends of the main shaft, and the two ends of the rotating shaft are rotatably connected to the two end caps 5 respectively; an inner magnetic rotor 6 is installed at one end of the main shaft; a motor 7 is provided at the end of the end cap 5 near the inner magnetic rotor 6 away from the rotating shaft; the motor 7 outputs... An outer magnetic rotor 8 is fixedly connected to the output shaft at the corresponding position of the inner magnetic rotor 6, and the outer magnetic rotor 8 covers the outside of the inner magnetic rotor 6 through the end cover 5; the end cover 5 away from the motor 7 is fixedly connected to the water inlet pipe 9; a pair of return holes 10 are opened on the inner wall of the pump casing 2 on the side of the connecting ring 3 near the water inlet pipe 9; a pair of return holes 21 are opened on the inner wall of the pump casing 2 near the motor 7; a guide hole 12 is opened inside the pump casing 2 and the connecting ring 3 between the return holes 10 and the return holes 21; when long-head, high-sealing liquid transportation is required during operation, the embodiment of the present invention can be used. First, before liquid pumping, the user needs to perform a priming operation, that is, the pump casing 2, the water inlet pipe 9, and the water inlet pipe 9 are primed. Both water pipe 9 and outlet pipe 4 are filled with the liquid to be pumped. The user then turns on motor 7, which drives the outer magnetic rotor 8 to rotate. The outer magnetic rotor 8, through the magnetic force between itself and the inner magnetic rotor 6, drives the inner magnetic rotor inside the pump casing 2 to rotate, which in turn drives the main shaft to rotate. The rotating main shaft then drives the impeller 1 on its surface to rotate, drawing the liquid from inlet pipe 9 into the pump body and pumping it to the connecting ring 3. During this process, some liquid enters the guide hole 12 through return hole 10, flows from guide hole 12 into return hole 11, and is discharged from return hole 11. It is then pumped by a set of impellers 1 on the other side of the main shaft and sent to the connecting ring 3. At point 3, both sets of impellers can pump the liquid in the pump body, thus achieving a multi-stage pumping effect and increasing the liquid conveying head. The two pairs of symmetrically arranged impellers 1, facing opposite directions, exert opposite axial forces on the main shaft. Since the number and size of the two sets of impellers 1 are the same, the main shaft is subjected to a pair of forces of the same magnitude but opposite directions, which balances the force on the main shaft in the axial direction. This avoids damage to the bearings at both ends of the main shaft due to uneven axial force, and also reduces axial movement of the main shaft, making the impeller 1 rotate more stably. This makes the liquid conveying more efficient and the energy utilization more efficient.

[0032] like Figures 1 to 3As shown, a base 13 is fixedly connected to the bottom of the motor 7; a pair of fixed rods 14 are fixedly connected to the top surface of the base 13 and the side near the motor 7; a movable rod 15 is slidably connected to the top surface of the base 13 and the side away from the fixed rods 14; a slot 16 is provided on the side of the fixed rod 14 near the movable rod 15, and the end of the movable rod 15 near the slot 16 is adapted to the slot 16; connecting blocks 17 are fixedly connected to both sides of the pump housing 2 and the end cover 5; mounting holes 18 are provided on the surface of the connecting block 17, and the mounting holes 18 are adapted to the movable rod 15 and the fixed rods 14; the surface of the movable rod 15... The pump body is connected to a nut 19 via a threaded connection. During operation, when the pump body becomes clogged or the impeller 1 needs to be replaced, the user needs to select the nut 19 and then move the moving rod 15 so that the end of the moving rod 15 disengages from the slot 16 at the end of the fixed rod 14. Then, the user slides the pump housing 2 so that the mounting holes 18 on the surface of the connecting blocks 17 on both sides of the pump housing 2 or the connecting ring 3 disengage from the moving rod 15 or the fixed rod 14, thereby completing the disassembly of the pump housing 2. At this time, the main shaft will be exposed to the user, making it easier for the user to disassemble and maintain the impeller 1.

[0033] like Figures 2 to 3 As shown, the main shaft includes a first secondary shaft 20 and a second secondary shaft 21; the first secondary shaft 20 is fixedly connected to the inner magnetic rotor 6; the ends of the first secondary shaft 20 and the second secondary shaft 21 that are far apart from each other are rotatably connected to two end caps 5 respectively; a transmission block 22 is fixedly connected to the end of the first secondary shaft 20 near the second secondary shaft 21, and the end face of the transmission block 22 is rectangular; a mating groove 23 is provided at the end of the second secondary shaft 21 near the transmission block 22, and the mating groove 23 is adapted to the transmission block 22; during operation, when the user moves the rod 15 After the slot 16 at the end of the fixed rod 14 is pulled out, the user can pull the moving rod 15 and the connecting block 17, pump housing 2 and connecting ring 3 on the moving rod 15 away from the fixed rod 14. At this time, the secondary shaft 21 will also move away from the secondary shaft 20, and the transmission block 22 on the end face of the secondary shaft 20 will disengage from the mating groove on the end face of the secondary shaft 21. Thus, the embodiment of the present invention is no longer divided into two parts. At this time, when the user replaces the impeller 1, there is no need to disassemble too many pump housings 2, thereby improving the user's maintenance efficiency.

[0034] like Figure 1 and Figure 5As shown, the movable rod 15 has an installation groove 24 at one end near the fixed rod 14; a baffle 25 is slidably connected inside the installation groove 24, and the cross section of the baffle 25 is set in a right-angled triangle; a spring 26 is fixedly connected between the two baffles 25; during operation, when the movable rod 15 is pulled away from the fixed rod 14, the baffle 25 in the installation groove 24 at the end of the movable rod 15 will pop out from the installation groove 24 under the action of the spring 26 and lock onto the surface of the connecting blocks 17 on both sides of the connecting ring 3. Thus, when the user pulls the movable rod 15 and its pump housing 2 and connecting ring 3 away from the fixed rod 14, the baffle 25 can play a limiting role, preventing the connecting ring 3 at the end from sliding directly off the movable rod 15 due to inertia, thereby causing the connecting ring 3 to fall off and be damaged by collision.

[0035] like Figures 5 to 7 As shown, a pair of connecting seats 27 are mounted on the top surface of the base 13; each connecting seat 27 has a support seat 28 on its top surface; the support seat 28 closer to the motor 7 is fixedly connected to the connecting seat 27 at its bottom, while the support seat 28 farther from the motor 7 is slidably connected to the connecting seat 27 at its bottom; a screw 29 is rotatably connected to the top surface of the connecting seat 27 farther from the motor 7, and the screw 29 is threadedly connected to the support seat 28; the moving rod 15 is fixed to the end face of the support seat 28 on the side closer to the screw 29, while the fixing rod 14 is fixed to the support seat on the side farther from the screw 29. 28 end face; During operation, when the user needs to pull the moving rod 15 away from the fixed rod 14, the user can screw the screw 29, which will drive the support seat 28 connected to it to move away from the motor 7. During this process, the pump housing 2 and the connecting ring 3 are both supported by the support seat 28, which prevents the fixed rod 14 and the moving rod 15 from being fixed at only one end on the end face of the support seat 28. This would prevent the end of the fixed rod 14 and the moving rod 15 from being close to each other due to insufficient support, and thus prevent irreversible deformation under the long-term gravity compression of the pump housing 2 and the connecting ring 3.

[0036] like Figure 1 and Figure 5 As shown, a pair of strip grooves 30 are provided on the top surface of the support base 28; multiple evenly arranged rollers 31 are rotatably connected in both strip grooves 30, and the rollers 31 are in contact with the pump housing 2; during operation, when the user removes the connecting ring 3 or the pump housing 2 from the fixed rod 14 or the moving rod 15, the pump housing 2 or the connecting ring 3 will undergo relative displacement with the support base 28. At this time, the rollers 31 in the strip grooves 30 can reduce the friction between the two during relative movement, thereby reducing the wear of the two and improving their service life.

[0037] like Figures 5 to 6As shown, the bottom surfaces of both connecting seats 27 are fixedly connected to secondary gears 32, and the secondary gears 32 are rotatably connected to the base 13; the top surface of the base 13 is rotatably connected to a main gear 33 between the two secondary gears 32; toothed plates 34 are slidably connected to both sides of the main gear 33, and the toothed plates 34 are slidably connected to the base 13; both toothed plates 34 are meshed with the main gear 33, and the two toothed plates 34 are respectively meshed with the two secondary gears 32; during operation, when the user moves the support seat 28 on one side of the moving rod 15 away from the motor 7, sufficient space will be left between the two support seats 28, and then the user can rotate one side of the connecting seat 27, and the connecting seat 27 will drive the toothed plate 34 to slide through the secondary gear 32 at its bottom, and the sliding toothed plate 34 will drive the main gear 33 to rotate, thereby driving the toothed plate 34 and the secondary gear 32 on the other side to rotate, thereby realizing that the two connecting seats 27 rotate synchronously in opposite directions by 90 degrees, thus leaving more operating space for the user, thereby reducing the maintenance difficulty for the user.

[0038] like Figure 5 , Figure 7 and Figure 8 As shown, the screw 29 has a through hole 35 on its end face, and the through hole 35 extends through the entire screw 29; a slide rod 36 is slidably connected inside the through hole 35; an insertion hole 37 is provided at the end of the slide rod 36 near the motor 7; the connecting seat 27 near the motor 7 has a threaded connection of an insertion rod 38 on the side near the screw 29, and the insertion rod 38 is adapted to the insertion hole 37; during operation, when the end faces of the two support seats 28 are in contact, the user can slide the slide rod 36 to insert the slide rod 36 into the support seat 28 near the motor 7. At this time, the user can then screw the insertion rod 38 so that the insertion rod 38 passes through the insertion hole 37 on the surface of the slide rod 36, thereby locking the two support seats 28 together, thus preventing accidental rotation during operation and damage to other surrounding equipment.

[0039] like Figures 7 to 8 As shown, a handle 39 is fixedly connected to the end of the slide rod 36 away from the insertion hole 37; a pair of insertion plates 40 are fixedly connected to the end of the slide rod 36 near the insertion hole 37; a plurality of evenly arranged slots 41 are provided on the end of the screw 29 near the insertion plates 40, and the slots 41 are adapted to the insertion plates 40; during operation, when the user needs to rotate the screw 29, the user needs to screw the insertion rod 38 to disengage it from the insertion hole 37 on the surface of the slide rod 36, and then the user pulls the slide rod 36 to insert the insertion plate 40 on the end face of the slide rod 36 into the slot 41, thereby enabling the slide rod 36 and the screw 29 to rotate synchronously. At this time, the user can rotate the handle 39 at the end of the slide rod 36 to drive the screw 29 to rotate through the slide rod 36, thereby reducing the difficulty for the user to rotate the screw 29.

[0040] like Figures 7 to 8As shown, a pressure ring 42 is threadedly connected to one end of the slide rod 36 near the handle 39; a plurality of evenly arranged connecting posts 43 are fixedly connected to the side surface of the pressure ring 42; during operation, when the user inserts the insert plate 40 at the end of the slide rod 36 into the slot 41, the user needs to rotate the pressure ring 42 through the connecting post 43 and move the pressure ring 42 to the end of the screw 29, thereby cooperating with the insert plate 40 to clamp the screw 29, and thus connecting the slide rod 36 and the screw 29 into a whole, preventing the insert plate 40 from coming out of the slot 41 during the user's rotation of the slide rod 36.

[0041] When operating a liquid conveying system requiring long lift and high sealing, this embodiment of the invention can be used. First, before pumping the liquid, the user needs to perform a priming operation, filling the pump casing 2, inlet pipe 9, and outlet pipe 4 with the liquid to be pumped. Then, the user turns on the motor 7. The motor 7 drives the outer magnetic rotor 8 to rotate, and the outer magnetic rotor 8, through the magnetic force between itself and the inner magnetic rotor 6, drives the inner magnetic rotor inside the pump casing 2 to rotate, which in turn drives the main shaft to rotate. The rotating main shaft then drives the impeller 1 on its surface to rotate, thereby drawing the liquid from the inlet pipe 9 into the pump body and pumping it to the connecting ring 3. During this process, some liquid will also enter the guide hole 12 through the return hole 10, and then flow from the guide hole 12 into the return hole 11, and out of the return hole... The liquid is discharged from the main shaft and then pumped by another set of impellers 1 on the other side of the main shaft, and then sent to the connecting ring 3. Thus, both sets can pump the liquid in the pump body, thereby achieving the effect of multi-stage pumping and increasing the liquid conveying head. The two pairs of symmetrically arranged impellers 1, due to their opposite orientation, exert opposite axial forces on the main shaft. The two sets of impellers 1 are identical in number and size. Thus, the main shaft is subjected to a pair of forces of the same magnitude but opposite direction, thereby balancing the forces on the main shaft in the axial direction. This avoids damage to the bearings at both ends of the main shaft due to uneven axial forces, which would otherwise be caused by long-term pressure and compression. At the same time, it reduces the axial movement of the main shaft and makes the rotation of the impellers 1 more stable, thereby making the liquid conveying more efficient and the energy utilization more efficient.

[0042] When the pump body becomes clogged or the impeller 1 needs to be replaced, the user needs to select the nut 19 and then move the moving rod 15 so that the end of the moving rod 15 disengages from the slot 16 at the end of the fixed rod 14. Then, the user slides the pump housing 2 so that the mounting holes 18 on the surface of the connecting blocks 17 on both sides of the pump housing 2 or the connecting ring 3 disengage from the moving rod 15 or the fixed rod 14, thus completing the disassembly of the pump housing 2. At this time, the main shaft will be exposed to the user, so that the user can more easily disassemble and maintain the impeller 1.

[0043] When the user moves the lever 15 to pull out the slot 16 at the end of the fixed lever 14, the user can pull the lever 15, the connecting block 17, the pump housing 2, and the connecting ring 3 on the lever 15 away from the fixed lever 14. At this time, the secondary shaft 21 will also move away from the secondary shaft 20, and the transmission block 22 on the end face of the secondary shaft 20 will disengage from the mating groove on the end face of the secondary shaft 21. Thus, the embodiment of the present invention is no longer divided into two parts. When the user replaces the impeller 1, there is no need to disassemble too much of the pump housing 2, thereby improving the user's maintenance efficiency.

[0044] When the movable rod 15 is pulled away from the fixed rod 14, the baffle 25 in the mounting groove 24 at the end of the movable rod 15 will pop out from the mounting groove 24 under the action of the spring 26 and lock onto the surface of the connecting blocks 17 on both sides of the connecting ring 3. Thus, when the user pulls the movable rod 15 and its pump housing 2 and connecting ring 3 away from the fixed rod 14, the baffle 25 can play a limiting role, preventing the connecting ring 3 at the end from slipping directly off the movable rod 15 due to inertia, thereby causing the connecting ring 3 to fall off and be damaged by the collision.

[0045] When the user needs to pull the moving rod 15 away from the fixed rod 14, the user can screw the screw 29, which will drive the support seat 28 connected to it to move away from the motor 7. During this process, the pump housing 2 and the connecting ring 3 are both supported by the support seat 28, which prevents the fixed rod 14 and the moving rod 15 from being fixed at only one end to the end face of the support seat 28. This would prevent the end of the fixed rod 14 and the moving rod 15 from being close to each other due to insufficient support, and thus prevent irreversible deformation under the long-term gravity compression of the pump housing 2 and the connecting ring 3.

[0046] When the user removes the connecting ring 3 or the pump housing 2 from the fixed rod 14 or the moving rod 15, the pump housing 2 or the connecting ring 3 will undergo relative displacement with the support base 28. At this time, the roller 31 in the strip groove 30 can reduce the friction between the two during relative movement, thereby reducing the wear of the two and improving their service life.

[0047] When the user moves the support seat 28 on one side of the moving rod 15 away from the motor 7, enough space will be left between the two support seats 28. Then the user can rotate one side of the connecting seat 27, and the connecting seat 27 will drive the toothed plate 34 to slide through the secondary gear 32 at its bottom. The sliding toothed plate 34 will drive the main gear 33 to rotate, which in turn will drive the toothed plate 34 and the secondary gear 32 on the other side to rotate. This will enable the two connecting seats 27 to rotate 90 degrees in opposite directions in sync, thus providing the user with more operating space and reducing the user's maintenance difficulty.

[0048] When the end faces of the two support seats 28 are in contact, the user can slide the slide rod 36 and insert the slide rod 36 into the support seat 28 on the side closer to the motor 7. At this time, the user can then turn the insertion rod 38 so that the insertion rod 38 passes through the insertion hole 37 on the surface of the slide rod 36, thereby locking the two support seats 28 together. This prevents accidental rotation during operation of the present invention, which could damage other surrounding equipment.

[0049] When the user needs to rotate the screw 29, the user needs to screw the insert rod 38 to disengage it from the insertion hole 37 on the surface of the slide rod 36. Then the user pulls the slide rod 36 to insert the insert plate 40 on the end face of the slide rod 36 into the slot 41, so that the slide rod 36 and the screw 29 can rotate synchronously. At this time, the user can turn the handle 39 at the end of the slide rod 36 to drive the screw 29 to rotate through the slide rod 36, thereby reducing the difficulty for the user to rotate the screw 29.

[0050] When the user inserts the insert plate 40 at the end of the slide bar 36 into the slot 41, the user needs to rotate the pressure ring 42 through the connecting post 43 and move the pressure ring 42 to the end of the screw 29, so that the insert plate 40 can clamp the screw 29, thereby connecting the slide bar 36 and the screw 29 into a whole, preventing the insert plate 40 from coming out of the slot 41 during the user's rotation of the slide bar 36.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetically driven radial flow multistage centrifugal pump, characterized in that: The system includes a main shaft; multiple impellers are uniformly arranged and fixed to the surface of the main shaft; the multiple impellers are divided into two groups, and the impellers in these two groups are installed in opposite directions; multiple pump casings are uniformly arranged on the outer side of each group of impellers; a connecting ring is provided between the two pump casings; a water outlet pipe is fixed to the top of the connecting ring; end caps are fixed to both ends of the main shaft, and the two ends of the rotating shaft are rotatably connected to the two end caps respectively; an inner magnetic rotor is installed at one end of the main shaft; a motor is provided at the end of the end cap near the inner magnetic rotor, away from the rotating shaft; an outer magnetic rotor is fixed to the output shaft of the motor at the corresponding position of the inner magnetic rotor, and the outer magnetic rotor covers the outside of the inner magnetic rotor through the end cap; a water inlet pipe is fixed to the end cap away from the motor; a pair of return holes one is opened on the inner wall of the pump casing near the water inlet pipe on the side of the connecting ring; a pair of return holes two is opened on the inner wall of the pump casing near the motor; guide holes are opened inside the pump casing and the connecting ring between the return holes one and the return holes two.

2. The magnetically driven radial flow multistage centrifugal pump according to claim 1, characterized in that: A base is fixedly connected to the bottom of the motor; a pair of fixed rods are fixedly connected to the top surface of the base and the side closest to the motor; a movable rod is slidably connected to the top surface of the base and the side away from the fixed rods; a slot is provided on the side of the fixed rod close to the movable rod, and the end of the movable rod close to the slot is adapted to the slot; connecting blocks are fixedly connected to both sides of the pump housing and the end cover; mounting holes are provided on the surface of the connecting blocks, and the mounting holes are adapted to the movable rod and the fixed rods; a nut is threaded onto the surface of the movable rod.

3. A magnetically driven radial flow multistage centrifugal pump according to claim 2, characterized in that: The main shaft includes a secondary shaft one and a secondary shaft two; the secondary shaft one is fixedly connected to the inner magnetic rotor; the ends of the secondary shaft one and the secondary shaft two that are far apart from each other are rotatably connected to two end caps respectively; a transmission block is fixedly connected to the end of the secondary shaft one that is close to the secondary shaft two, and the end face of the transmission block is rectangular; a mating groove is opened at the end of the secondary shaft two that is close to the transmission block, and the mating groove is adapted to the transmission block.

4. A magnetically driven radial flow multistage centrifugal pump according to claim 3, characterized in that: The movable rod has an installation groove at one end near the fixed rod; a baffle is slidably connected inside the installation groove, and the cross-section of the baffle is set in a right-angled triangle; a spring is fixedly connected between the two baffles.

5. A magnetically driven radial flow multistage centrifugal pump according to claim 2, characterized in that: A pair of connecting seats are installed on the top surface of the base; each connecting seat has a support seat on its top surface; the support seat closer to the motor is fixedly connected to the connecting seat at its bottom, while the support seat farther from the motor is slidably connected to the connecting seat at its bottom; a screw is rotatably connected to the top surface of the connecting seat farther from the motor, and the screw is threadedly connected to the support seat; the moving rod is fixed to the end face of the support seat on the side closer to the screw, while the fixing rod is fixed to the end face of the support seat on the side farther from the screw.

6. A magnetically driven radial flow multistage centrifugal pump according to claim 5, characterized in that: The top surface of the support base is provided with a pair of strip grooves; multiple evenly arranged rollers are rotatably connected in both strip grooves, and the rollers are in contact with the pump casing.

7. A magnetically driven radial flow multistage centrifugal pump according to claim 6, characterized in that: The bottom surfaces of both connecting seats are fixedly connected to auxiliary gears, and the auxiliary gears are rotatably connected to the base; the top surface of the base is rotatably connected to a main gear between the two auxiliary gears; toothed plates are slidably connected to both sides of the main gear; both toothed plates are meshed with the main gear, and the two toothed plates are respectively meshed with the two auxiliary gears.

8. A magnetically driven radial flow multistage centrifugal pump according to claim 7, characterized in that: The screw end face has a through hole that extends through the entire screw; a slide rod is slidably connected inside the through hole; an insertion hole is provided at the end of the slide rod near the motor; the connecting seat near the motor has a threaded insertion rod on the side near the screw, and the insertion rod is adapted to the insertion hole.

9. A magnetically driven radial flow multistage centrifugal pump according to claim 8, characterized in that: A handle is fixedly connected to the end of the slide rod away from the insertion hole; a pair of insertion plates are fixedly connected to the end of the slide rod near the insertion hole; a plurality of evenly arranged slots are provided on the end of the screw rod near the insertion plates, and the slots are adapted to the insertion plates.

10. A magnetically driven radial flow multistage centrifugal pump according to claim 9, characterized in that: The end of the slide rod near the handle is threaded with a pressure ring; a plurality of evenly arranged connecting posts are fixed to the side surface of the pressure ring.

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