PCB motor centrifugal pump

Abstract

The invention discloses a PCB motor centrifugal pump and relates to the technical field of centrifugal pumps, the PCB motor centrifugal pump comprises a pump shell assembly and a driving assembly, the pump shell assembly comprises a pump shell and an impeller mechanism, the pump shell is provided with a water outlet channel, the impeller mechanism comprises an impeller, a first permanent magnet and a second permanent magnet, and the impeller is rotationally connected with the pump shell and forms a water inlet channel; the first permanent magnet and the second permanent magnet are arranged on the two opposite sides of the impeller. The driving assembly is arranged on the pump shell and comprises a first stator and a second stator, the first stator is arranged on the side, back to the impeller, of the first permanent magnet, and the second stator is arranged on the side, back to the impeller, of the second permanent magnet. When the first stator and the second stator are electrified, acting force can be applied to the first permanent magnet and the second permanent magnet at the same time through electromagnetic induction, the impeller is driven to rotate from the two sides of the impeller, and compared with an existing centrifugal pump which only applies acting force to one side of the impeller, the impeller driving efficiency is obviously higher, and the impeller driving efficiency is improved. And the working efficiency of the centrifugal pump is high.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, and in particular to a PCB motor centrifugal pump. Background Art

[0002] Centrifugal pumps are important fluid conveying equipment in the fields of shipbuilding and aviation. Traditional centrifugal pumps generally work by using an electric motor to drive the impeller, and the motor is mostly external. The pump body of this type of centrifugal pump occupies a large axial space; the drive motor usually needs to be connected to the impeller drive shaft through a coupling. The coupling is easy to damage and complicated to load and unload, so some people have made improvements to the centrifugal pump.

[0003] The prior art with announcement number CN115539400A discloses a disc-type reluctance motor integrated impeller centrifugal double-suction pump, including a casing, a volute, a centrifugal impeller and a motor stator. The volute is provided with an impeller cavity and a circumferential outlet. The centrifugal impeller is arranged in the impeller cavity and the volute to form a centrifugal pumping structure. The centrifugal impeller includes a back plate, blades and a rotating shaft. The blades are fixed on both axial sides of the back plate. A fluid channel is formed between the blades on the same side of the back plate. The rotating shaft is fixed to the back plate and is provided with an inlet for liquid to flow into the fluid channel. The centrifugal impeller constitutes a motor rotor, and the blades are rotor poles. The casing is fixed on the volute, and the rotating shaft is rotatably connected to the casing. The motor stator includes a disc-shaped magnetic conductive core and a coil wound thereon. The motor stator is arranged on both axial sides of the centrifugal impeller and fixed in the casing. The motor stator and the centrifugal impeller constitute a double-stator single-rotor disc-type switched reluctance motor structure.

[0004] However, the existing centrifugal pump still has some shortcomings. For example, the motor stator is only arranged on one side of the impeller of the centrifugal pump, resulting in insufficient driving force of the motor stator on the impeller when power is turned on, low working efficiency of the centrifugal pump, and unbalanced axial force is generated, which accelerates the wear of the bearing. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a PCB motor centrifugal pump to solve the technical problems that in the prior art, the motor stator is only arranged on one side of the impeller of the centrifugal pump, resulting in insufficient driving force of the motor stator on the impeller when power is turned on, low working efficiency of the centrifugal pump, unbalanced axial force, and accelerated wear of the bearing.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a PCB motor centrifugal pump, comprising: A pump casing assembly, comprising a pump casing and an impeller mechanism, wherein the impeller mechanism comprises an impeller, a first permanent magnet and a second permanent magnet, wherein the impeller is rotatably connected to the pump casing, and the first permanent magnet and the second permanent magnet are disposed on opposite sides of the impeller; and A drive assembly is arranged on the pump housing, and the drive assembly includes a first stator and a second stator. The first stator is arranged on a side of the first permanent magnet facing away from the impeller, and the second stator is arranged on a side of the second permanent magnet facing away from the impeller.

[0007] In some embodiments, the number of the first permanent magnet and the number of the second permanent magnet are both plural, the plurality of the first permanent magnets and the plurality of the second permanent magnets are uniformly arranged around the circumference of the impeller, and the first stator and the second stator are both ring-shaped.

[0008] In some embodiments, the pump casing includes a shell, an end cover and an upper seal, the shell is rotatably connected to the impeller, the end cover is connected to the shell, the upper seal is connected to the end cover and encloses the end cover to form a first sealed cavity, and the first stator is located in the first sealed cavity.

[0009] In some embodiments, the pump housing also includes a first sealing ring, the upper sealing member is provided with a first annular groove, the first stator is clamped in the first annular groove, the upper sealing member is provided with a first annular positioning groove along its circumference, the first sealing ring is clamped in the first positioning groove, and the first sealing ring elastically abuts against the end cover.

[0010] In some embodiments, the pump casing also includes a first bearing arranged on the end cover, the upper seal is annular and formed with a first through hole, the impeller passes through the first through hole and is connected to the first bearing, and the rotation axis of the first bearing is colinear with the rotation axis of the impeller.

[0011] In some embodiments, the pump housing further includes a lower seal, which is connected to the shell and enclosed with the shell to form a second sealed cavity, and the second stator is located in the second sealed cavity.

[0012] In some embodiments, the pump housing also includes a second sealing ring, the lower sealing component is provided with a second annular groove, the second stator is clamped in the second annular groove, the lower sealing component is provided with an annular second positioning groove along its circumference, the second sealing ring is clamped in the second positioning groove, and the second sealing ring elastically abuts against the housing.

[0013] In some embodiments, the pump casing further includes a second bearing disposed on the housing, the side of the impeller facing away from the first bearing is connected to the second bearing, and the rotation axis of the second bearing is colinear with the rotation axis of the impeller.

[0014] In some embodiments, the PCB motor centrifugal pump also includes a power supply arranged on the pump housing, the power supply has a waterproof channel, the waterproof channel connects the first sealed cavity and the second sealed cavity, and the first stator and the second stator are both connected to the power supply through the wires of the waterproof channel.

[0015] In some embodiments, the power supply has a waterproof socket, the waterproof socket has a slot and a convex seat arranged on the slot, the slot wall is provided with a card slot, the card slot is connected with a waterproof ring, and the convex seat is provided with an electrode jack.

[0016] Compared with the prior art, the PCB motor centrifugal pump provided by the present invention has a first permanent magnet and a first stator on one side of its impeller, and a second permanent magnet and a second stator on the other side. When the first stator and the second stator are both energized, they can simultaneously apply force to the first permanent magnet and the second permanent magnet through electromagnetic induction, driving the impeller to rotate from both sides of the impeller. Compared with the existing centrifugal pump that only applies force to one side of the impeller, the driving efficiency of the impeller in the present application is significantly stronger, the working efficiency of the centrifugal pump is high, the axial force generated by the impeller is balanced, and the wear on the bearing is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a PCB motor centrifugal pump provided by an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the cross section in the AA direction; Figure 3 is an exploded schematic diagram of a PCB motor centrifugal pump provided by an embodiment of the present invention from one perspective; Figure 4 is an exploded schematic diagram of a PCB motor centrifugal pump provided by an embodiment of the present invention from another perspective; Figure 5 It is a schematic diagram of the structure of a power supply provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problem that in the prior art, a centrifugal pump is only provided with a motor stator on one side of an impeller, resulting in insufficient driving force of the motor stator on the impeller when power is supplied, and low working efficiency of the centrifugal pump, the present invention provides a PCB motor centrifugal pump, which can realize that motor stators are provided on both sides of the impeller. The motor stators on both sides can drive the impeller to rotate at the same time when power is supplied, thereby providing a stronger driving force for the impeller, and greatly improving the working efficiency of the centrifugal pump.

[0020] See also Figure 1 and Figure 2 , Figure 1 Schematic diagram of the structure of a PCB motor centrifugal pump in an embodiment of the present invention. The PCB motor centrifugal pump 100 includes a pump casing assembly and a drive assembly. The pump casing assembly includes a pump casing 1 and an impeller mechanism 2. The pump casing 1 has a water outlet channel 11. The impeller mechanism 2 includes an impeller 21, a first permanent magnet 22 and a second permanent magnet 23. The impeller 21 is rotatably connected to the pump casing 1 and forms a water inlet channel 211. The water inlet channel 211 is connected to the water outlet channel 11 so that the impeller 21 can suck water into the water inlet channel 211 and discharge it from the water outlet channel 11 when rotating. The first permanent magnet 22 and the second permanent magnet 23 are arranged on opposite sides of the impeller 21.

[0021] The drive assembly is disposed on the pump housing 1 , and includes a first stator 31 and a second stator 32 . The first stator 1 is disposed on a side of the first permanent magnet 22 facing away from the impeller 21 , and the second stator 32 is disposed on a side of the second permanent magnet 23 facing away from the impeller 21 .

[0022] In this embodiment, the first stator 31 and the second stator 32 are respectively located on both sides of the impeller 21. When the first stator 31 and the second stator 32 are both powered on, they can simultaneously apply a force to the first permanent magnet 22 and the second permanent magnet 23 on both sides of the impeller 21 through electromagnetic induction, so as to apply a force to the impeller 21 from both sides. The power applied to the impeller 21 is large, the working efficiency of the centrifugal pump 100 is higher, the axial force generated by the impeller 21 is balanced, and the wear on the bearing is small.

[0023] The first stator 31 and the second stator 32 are both PCB stators, and are both provided with corresponding coil windings and back irons. For example, the first stator 31 has a plurality of first coil windings 331 arranged around the back iron, and the second stator 32 has a plurality of second coil windings 332 arranged around the back iron. The first coil windings 331 and the second coil windings 332 are arranged facing the first permanent magnet 22 and the second permanent magnet 23 on the impeller 21, respectively. The first coil windings 331 and the second coil windings 332 can generate a rotating magnetic field when powered on. The rotating magnetic field drives the first permanent magnet 22 and the second permanent magnet 23 on the impeller 21 to drive the impeller 21 to rotate, and will do work on the liquid sucked in by the water inlet of the impeller 21, driving the liquid to rotate at a high speed. The liquid flows toward the periphery of the impeller 21 and enters the pump casing 1 through the water inlet channel 211 of the impeller 21, and is finally discharged from the pump through the radial water outlet channel 11. In addition, the high-speed flowing liquid inside the pump casing 1 can also cool the first stator 31 and the second stator 32, as well as lubricate and cool the rotating connection between the impeller 21 and the pump casing 1.

[0024] The PCB stator used in this embodiment also has the following obvious advantages: Size and weight advantages: PCB stator technology can significantly reduce the size of traditional stators, making the motor itself more compact. At the same time, since the weight of the PCB stator is smaller, it is conducive to energy saving and carbon reduction.

[0025] High integration: PCB stator technology allows devices such as sensors to be placed directly on the PCB, improving integration and simplifying assembly.

[0026] Lower cost and energy consumption: The copper content of PCB motor stators is about 66% less than that of traditional winding stators. At the same time, the life of PCB motor stators is long, which is about ten times that of traditional motor stators.

[0027] Product consistency: The PCB manufacturing process is highly automated, and quantitative control can be performed on the processing process, providing consistency for the product.

[0028] Thermal stability: PCB stators have similar coefficients of thermal expansion, allowing them to contract and expand evenly during hot and cold cycles without thermal stresses that could cause cracks in the structure.

[0029] High efficiency and power density: PCB stator disc type permanent magnet synchronous motor has the advantages of simple manufacturing, high efficiency and high motor power density.

[0030] Lightweight: The coreless stator achieves the goal of lightweight motor.

[0031] Reduce loss: The coreless PCB stator effectively avoids the hysteresis loss and eddy current loss caused by the stator core, eliminates the cogging torque pulsation, and improves the motor efficiency.

[0032] Improved motor reliability: PCB stators improve motor reliability by eliminating potential failure points associated with copper windings and insulation in traditional motors.

[0033] Modular Design: The PCB stator adopts a modular design and can be expanded according to the power requirements of the application without changing the core motor structure.

[0034] In one embodiment, see Figure 3 and Figure 4 , the number of the first permanent magnet 22 and the number of the second permanent magnet 23 are both multiple, the multiple first permanent magnets 22 and the multiple second permanent magnets 23 are uniformly arranged around the circumference of the impeller 21, the first stator 31 and the second stator 32 are both annular, and the annular area of ​​the first stator 31 corresponds to the multiple first permanent magnets 22 arranged in an annular shape, so that the first stator 31 can apply a force to the first permanent magnets 22 at all positions when power is turned on. The annular area of ​​the second stator 32 corresponds to the multiple second permanent magnets 23 arranged in an annular shape, so that the second stator 32 can apply a force to the second permanent magnets 23 at all positions when power is turned on, the speed and driving force of the impeller 21 are greater, and the working efficiency of the centrifugal pump is higher.

[0035] The plurality of first permanent magnets 22 and the plurality of second permanent magnets 23 are arranged in a Halbach array, which has the following advantages: Enhanced magnetic field strength: Halbach arrays are able to enhance magnetic field strength in specific directions, which is ideal for applications requiring high efficiency and power.

[0036] Unilateral magnetic field characteristics: The magnetic field of the Halbach array is concentrated on one side, while the magnetic field on the other side is weak or close to zero, which is very useful in applications that require a specific magnetic field direction and distribution, such as magnetic levitation technology.

[0037] Improved efficiency: The concentrated magnetic field of the Halbach array can reduce energy losses and improve the overall efficiency of the magnetic system, especially in applications such as magnetic bearings and electric motors.

[0038] Compact Design: Halbach arrays are able to produce stronger magnetic fields with less material than conventional magnets, enabling more compact designs.

[0039] The Halbach array in the motor's rotor produces a perfectly smooth sinusoidal voltage pattern in the stator as it rotates. This provides optimal conditions for efficient variable speed operation and avoids the high-frequency losses associated with non-sinusoidal systems.

[0040] In one embodiment, see Figure 3 and Figure 4The pump casing 1 includes a casing 12, an end cover 13 and an upper seal 14. The casing 12 is rotatably connected to the impeller 21 and is formed with the above-mentioned water inlet channel 211. The end cover 13 is connected to the casing 12. The upper seal 14 is connected to the end cover 13 and is enclosed with the end cover 13 to form a first sealed cavity. The first stator 31 is located in the first sealed cavity. In this embodiment, the peripheral side of the end cover 13 is detachably connected to the casing 12 by a plurality of screws to facilitate the disassembly and replacement of the parts inside the casing 12. The peripheral side of the upper seal 14 is detachably connected to the end cover 13 by a plurality of screws to facilitate disassembly and assembly. The first sealed cavity enclosed by the upper seal 14 and the end cover 13 can be used for waterproofing to prevent water from contacting the first stator 31 of the first sealed cavity.

[0041] In one embodiment, see Figure 3 The pump housing 1 further includes a first sealing ring (not shown in the figure). The upper sealing member 14 is provided with a first annular groove 141, and the first stator 31 is clamped in the first annular groove 141 to fix the first stator 31. The upper sealing member 14 is provided with an annular first positioning groove 142 along its circumference, and the first sealing ring is clamped in the first positioning groove 142. The first sealing ring elastically abuts against the end cover 13. The first sealing ring is located outside the first annular groove 141, surrounds the first annular groove 141, and can waterproof the first stator 31 in the first annular groove 141 in all directions.

[0042] In one embodiment, see Figure 3 The pump housing 1 further includes a first bearing 17 provided on the impeller 21. The upper seal 14 is annular and is formed with a first through hole 143. The impeller 21 passes through the first through hole 143 and is connected to the first bearing 17. The rotation axis of the first bearing 1 is colinear with the rotation axis of the impeller 21. In this embodiment, the impeller 21 can be driven to rotate stably by providing the first bearing 1. The impeller 21 passes through the first through hole 143 and is connected to the first bearing 17 of the end cover 13, which is conducive to saving space in the pump housing 1.

[0043] In one embodiment, see Figure 4 The pump housing 1 further includes a lower seal 18, which is connected to the housing 12 and enclosed with the housing 12 to form a second sealed cavity, and the second stator 32 is located in the second sealed cavity. In this embodiment, the lower seal 18 and the housing 12 are detachably connected by a plurality of screws to facilitate the disassembly of the lower seal 18, and the second sealed cavity formed by the connection between the two is used to isolate external water to protect the second stator 32 of the second sealed cavity.

[0044] In one embodiment, see Figure 4The pump housing 1 further includes a second sealing ring, the lower sealing member 18 is provided with a second annular groove 182, the second stator 32 is clamped in the second annular groove 182, the lower sealing member 18 is provided with an annular second positioning groove 183 along its circumference, the second sealing ring is clamped in the second positioning groove 183, and the second sealing ring is elastically abutted against the housing 1. The second stator 32 of this embodiment is annular and has an area consistent with the second annular groove 182, so that the second stator 32 can be stably fixed in the second annular groove 182. The second sealing ring is located outside the second annular groove 182, so as to seal the second stator 32 in the second annular groove 182 in all directions, thereby forming a good waterproof effect.

[0045] In one embodiment, see Figure 4 The pump housing 1 further includes a second bearing 20 disposed on the housing 12, and the impeller 21 is connected to the second bearing 20 on the side facing away from the first bearing 17, and the rotation axis of the second bearing 20 is colinear with the rotation axis of the impeller 21. The first bearing 17 and the second bearing 20 are respectively connected on both sides of the impeller 21 of this embodiment, so that the impeller 21 can rotate more stably.

[0046] In one embodiment, see Figure 1 and Figure 5 The PCB motor centrifugal pump 100 further includes a power supply 4 disposed on the pump housing 1. The power supply 4 has a waterproof channel 41. The waterproof channel 41 communicates with the first sealed cavity and the second sealed cavity. The first stator 31 and the second stator 32 are both connected to the power supply 4 through the wire of the waterproof channel 41. When the power supply 4 of this embodiment is powered on, it can supply power to the first stator 31 and the second stator 32, so as to generate a driving force for the impeller 21 through electromagnetic induction with the first permanent magnet 22 and the second permanent magnet 23 on the impeller 21, thereby driving the impeller 21 to rotate. The waterproof channel 41 of the power supply 4 has the function of isolating water.

[0047] In one embodiment, see Figure 5 The power supply 4 has a waterproof socket 42, which has a slot 421 and a convex seat 422 arranged on the slot 421. The slot wall of the slot 421 is provided with a card slot, and the card slot is connected with a waterproof ring 423. The convex seat 422 is provided with an electrode socket 424. The waterproof socket 42 of this embodiment is used to be plugged and matched with an external power supply plug, so that the power supply plug supplies power to the power supply 4, thereby energizing the first stator 31 and the second stator 32, and driving the impeller 21 to rotate. The convex seat 422 of this embodiment is located in the slot 421, so as to facilitate the plug-in and match with the external power supply plug, and the connection is stable. There are three electrode sockets 424 on the convex seat 422, all of which are used to be plugged with the electrode pins of the power supply plug to achieve electrical connection. The card slot opened on the slot wall of the slot 421 is circular, and the waterproof ring 423 is also circular and is fixed in the card slot. When the power supply plug is connected to the power supply 4, the waterproof ring 423 can isolate external water from entering the electrode socket 424 to play a waterproof role.

[0048] In order to better understand the present invention, the following Figures 1 to 5 The technical solution of the present invention is described in detail: The PCB motor centrifugal pump provided by the present invention has a first permanent magnet 22 and a first stator 31 on one side of the impeller 21, and a second permanent magnet 23 and a second stator 32 on the other side. When the first stator 31 and the second stator 32 are both energized, a force can be applied to the first permanent magnet 22 and the second permanent magnet 23 at the same time through electromagnetic induction, thereby driving the impeller 21 to rotate from both sides of the impeller 21. Compared with the existing centrifugal pump that only applies a force on one side of the impeller, the driving efficiency of the impeller 21 in the present application is significantly stronger, and the working efficiency of the centrifugal pump is high.

[0049] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A PCB motor centrifugal pump, characterized in that: include: A pump casing assembly, comprising a pump casing and an impeller mechanism, wherein the impeller mechanism comprises an impeller, a first permanent magnet and a second permanent magnet, wherein the impeller is rotatably connected to the pump casing, and the first permanent magnet and the second permanent magnet are arranged on opposite sides of the impeller; and A drive assembly is arranged on the pump housing, and the drive assembly includes a first stator and a second stator. The first stator is arranged on a side of the first permanent magnet facing away from the impeller, and the second stator is arranged on a side of the second permanent magnet facing away from the impeller.

2. The PCB motor centrifugal pump according to claim 1, characterized in that: There are multiple first permanent magnets and multiple second permanent magnets, and the multiple first permanent magnets and the multiple second permanent magnets are evenly arranged around the circumference of the impeller. The first stator and the second stator are both ring-shaped.

3. The PCB motor centrifugal pump according to claim 1, characterized in that: The pump casing includes a shell, an end cover and an upper seal. The shell is rotatably connected to the impeller, the end cover is connected to the shell, the upper seal is connected to the end cover and encloses the end cover to form a first sealed cavity, and the first stator is located in the first sealed cavity.

4. The PCB motor centrifugal pump according to claim 3, characterized in that: The pump housing also includes a first sealing ring, the upper sealing member is provided with a first annular groove, the first stator is clamped in the first annular groove, the upper sealing member is provided with a first annular positioning groove along its circumference, the first sealing ring is clamped in the first positioning groove, and the first sealing ring elastically abuts against the end cover.

5. The PCB motor centrifugal pump according to claim 3, characterized in that: The pump housing also includes a first bearing arranged on the end cover, the upper seal is annular and formed with a first through hole, the impeller passes through the first through hole and is connected to the first bearing, and the rotation axis of the first bearing is colinear with the rotation axis of the impeller.

6. The PCB motor centrifugal pump according to claim 3, characterized in that: The pump housing further comprises a lower sealing member, which is connected to the housing and enclosed with the housing to form a second sealed cavity, and the second stator is located in the second sealed cavity.

7. The PCB motor centrifugal pump according to claim 6, characterized in that: The pump housing also includes a second sealing ring, the lower sealing member is provided with a second annular groove, the second stator is clamped in the second annular groove, the lower sealing member is provided with an annular second positioning groove along its circumference, the second sealing ring is clamped in the second positioning groove, and the second sealing ring elastically abuts against the housing.

8. The PCB motor centrifugal pump according to claim 7, characterized in that: The pump casing further comprises a second bearing arranged on the housing, a side of the impeller facing away from the first bearing is connected to the second bearing, and a rotation axis of the second bearing is colinear with a rotation axis of the impeller.

9. The PCB motor centrifugal pump according to claim 6, characterized in that: The PCB motor centrifugal pump also includes a power supply arranged on the pump housing, the power supply has a waterproof channel, the waterproof channel connects the first sealed cavity and the second sealed cavity, and the first stator and the second stator are both connected to the power supply through the wires of the waterproof channel.

10. The PCB motor centrifugal pump according to claim 9, characterized in that: The power supply has a waterproof socket, which has a slot and a convex seat arranged on the slot. The slot wall of the slot is provided with a card slot, the card slot is connected with a waterproof ring, and the convex seat is provided with an electrode plug hole.

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