A double-suction magnetic levitation pump

Abstract

A double-suction magnetic levitation pump includes a pump body assembly and a motor body mounted on the pump body assembly. A stator is installed inside the motor body, and a rotor that cooperates with the stator is located within the pump body assembly. The pump body assembly includes a left pump liquid chamber and a right pump liquid chamber symmetrically arranged along the motor body. A left impeller located in the left pump liquid chamber and a right impeller located in the right pump liquid chamber are respectively located at both ends of the rotor. The pump body assembly includes a left inlet connected to the left pump liquid chamber and a right inlet connected to the right pump liquid chamber. The inlet direction of the left inlet is opposite to that of the right inlet. Compared with existing technologies, the symmetrical structure of the left and right pump liquid chambers within the same pump body assembly ensures that the left and right impellers are subjected to equal and opposite axial liquid forces, achieving mutual cancellation of axial forces on the same rotor. This results in a rotor with an excellent dynamic structure of "support at both ends and load in the middle," a high critical speed, and suitability for high-speed operation.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation pump technology, and specifically to a double-suction magnetic levitation pump. Background Technology

[0002] A magnetic levitation pump is a fluid transport device that uses active magnetic levitation bearing technology to allow the rotor to levitate and rotate at high speed without contact within the pump chamber. Magnetic levitation pumps completely eliminate the mechanical bearings and seals of traditional pumps, achieving zero friction, zero leakage, and long service life.

[0003] The magnetic levitation pump generates a controllable magnetic field through an electromagnetic coil inside the pump casing, which makes the impeller with embedded permanent magnets stably levitate. The gap is only tens to hundreds of micrometers, with no physical contact. The electromagnetic field couples with the permanent magnet of the impeller to generate torque to drive the impeller to rotate at high speed. The rotation of the impeller generates centrifugal force or axial thrust to complete the liquid intake and discharge.

[0004] Magnetic levitation pumps typically have only one impeller, which limits the flow rate. Furthermore, when the impeller rotates, due to the requirement for axial force balance, the bottom and top structures of the impeller are asymmetrical, resulting in an asymmetrical distribution of delivery pressure. Consequently, the axial force on the impeller is unbalanced, with the pressure at the bottom of the impeller usually being greater than that at the top, and the axial force on the impeller pointing towards the inlet.

[0005] To balance the axial force of the impeller, balance holes or back blades are usually installed. However, these can only balance the axial force at some operating points and will increase flow losses and reduce the efficiency of the magnetic levitation pump.

[0006] Chinese patent CN116104775A discloses a magnetic levitation vacuum pump with a built-in axial force balancing system, including a magnetic levitation motor. The rotor of the magnetic levitation motor has an impeller and a balance wheel respectively arranged near its two ends. A volute is arranged on the magnetic levitation motor near the impeller. An air-cooled diffuser is arranged on the magnetic levitation motor near the balance wheel. A two-stage connecting pipe connects the air inlet end of the volute to the air-cooled diffuser. A cooling pipe is connected to the air inlet end of the volute. The other end of the cooling pipe is connected to the inner cavity of the magnetic levitation motor.

[0007] The aforementioned magnetic levitation vacuum pump reduces the axial force of the impeller by installing an impeller and a balance wheel at both ends of the rotor. However, the balance wheel can only balance the axial force under rated operating conditions. As the inlet pressure changes, the axial force of the impeller changes in real time, but the balance wheel is under fixed force. Under varying operating conditions, the imbalance is severe, which causes the rotor speed to decrease, reduces the efficiency of the magnetic levitation pump, and makes it prone to resonance at high speeds, affecting the levitation stability. Summary of the Invention

[0008] The present invention aims to overcome the defects in the prior art and provide a double-suction magnetic levitation pump with symmetrical structure, high pumping efficiency, and suitable for high-speed operation.

[0009] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a double-suction magnetic levitation pump, comprising a pump body assembly and a motor body mounted on the pump body assembly, wherein a stator is installed in the motor body, and a rotor cooperating with the stator is provided in the pump body assembly; the pump body assembly includes a left pump liquid chamber and a right pump liquid chamber symmetrically arranged along the motor body, and a left impeller and a right impeller respectively provided at both ends of the rotor, which are subjected to a liquid axial force of equal magnitude and opposite direction to the left impeller; the axial forces of the rotor cancel each other out under the action of the left and right impellers, the left impeller is located in the left pump liquid chamber, and the right impeller is located in the right pump liquid chamber; the pump body assembly includes a left inlet port connected to the left pump liquid chamber and a right inlet port connected to the right pump liquid chamber, wherein the liquid inlet direction of the left inlet port is opposite to the liquid inlet direction of the right inlet port.

[0010] As a preferred embodiment of the present invention, the pump body assembly includes a left pump housing and a right pump housing connected to each other, a left pump cover for forming a left pump liquid chamber is connected to the left pump housing, and a right pump cover for forming a right pump liquid chamber is connected to the right pump housing.

[0011] As a preferred embodiment of the present invention, the right pump housing includes a pump housing body for forming a right pump liquid chamber with the right pump cover and a sleeve body for connecting the left pump housing. The motor body is sleeved on the sleeve body, and the rotor is installed in the sleeve body with clearance fitting.

[0012] As a preferred embodiment of the present invention, a radial sealing ring for radial sealing of the pump body assembly is provided at the connection between the left pump housing and the sleeve body, and a sealing cover plate embedded in the pump housing body is provided at the end of the motor body.

[0013] As a preferred embodiment of the present invention, a left sealing ring for radial sealing of the left pump chamber is provided at the connection between the left pump housing and the left pump cover, and a right sealing ring for radial sealing of the right pump chamber is provided at the connection between the right pump housing and the right pump cover.

[0014] As a preferred embodiment of the present invention, the rotor includes an impeller base for synchronously driving the left impeller and the right impeller to rotate, with the left impeller and the right impeller respectively fixed at opposite ends of the impeller base.

[0015] As a preferred embodiment of the present invention, a left permanent magnet corresponding to the left impeller and a right permanent magnet corresponding to the right impeller are pressed into the impeller base by interference fit. The left and right permanent magnets are symmetrically arranged on the impeller base, with their S poles facing each other, and the left and right permanent magnets form a symmetrical closed loop in the pump body assembly.

[0016] As a preferred embodiment of the present invention, the stator includes magnetic silicon steel and a stator drive coil wound in the magnetic silicon steel using a three-phase distributed winding, with the magnetic silicon steel embedded in the motor body.

[0017] In a preferred embodiment of the present invention, a left outlet is formed on the left pump liquid chamber and communicates with the left pump liquid chamber; a left impeller inlet corresponding to the left inlet is formed in the middle of the left impeller; a left impeller outlet corresponding to the left outlet is formed in the circumferential direction of the left impeller; a right outlet is formed on the right pump liquid chamber and communicates with the right pump liquid chamber; a right impeller inlet corresponding to the right inlet is formed in the middle of the right impeller; and a right impeller outlet corresponding to the right outlet is formed in the circumferential direction of the right impeller.

[0018] In a preferred embodiment of the present invention, the pump body assembly is connected to a supply pipe for simultaneously supplying liquid to the left inlet and the right inlet. The supply pipe includes a left diverter pipe connected to the left inlet and a right diverter pipe connected to the right inlet. The pump body assembly is also connected to an outlet pipe for simultaneously receiving fluid from the left inlet and the right inlet. The outlet pipe includes a left drain pipe connected to the left outlet and a right drain pipe connected to the right outlet.

[0019] Compared to existing technologies, the left and right pump liquid chambers, which are symmetrically structured within the same pump body assembly, are subjected to equal and opposite axial liquid forces on the left and right impellers due to the opposite inflow directions of the left and right inlets. This achieves mutual cancellation of axial forces on the same rotor, resulting in an excellent dynamic structure of "support at both ends and load in the middle" for the rotor. It also has a high critical speed and is suitable for high-speed operation.

[0020] The double impeller structure, with its left and right impellers, can improve the pumping flow range and pumping efficiency. The overall structure is fully magnetically levitated, with no mechanical contact and no leakage, making it suitable for media with extremely high cleanliness requirements, such as ultrapure water, blood, and chemicals.

[0021] The magnetic field lines are symmetrical about the left and right permanent magnets. Through the magnetic conduction between the pump casing and the impeller base, they are closed without leakage, resulting in high magnetic field utilization and high driving efficiency. The symmetrical magnetic field lines cause the radial magnetic forces on the impeller base to cancel each other out, eliminating unilateral force. This results in low vibration and low noise during rotation, making it suitable for high-speed and high-pressure conditions. The symmetrical magnetic circuit ensures a uniform magnetic field distribution around the impeller base, resulting in smooth torque transmission without pulsation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the rotor structure;

[0024] Figure 3 This is a structural schematic diagram of the pump body assembly;

[0025] Figure 4 It is a diagram of the liquid's motion trajectory;

[0026] Reference numerals: Motor body 1, Stator drive coil 11, Magnetic silicon steel 12, Sealing cover 13, Pump body assembly 2, Left pump casing 21, Right pump casing 22, Pump casing body 23, Sleeve body 24, Left pump cover 25, Right pump cover 26, Left sealing ring 27, Radial sealing ring 28, Right sealing ring 29, Rotor 3, Impeller base 31, Left permanent magnet 32, Right permanent magnet 33, Left impeller 34, Right impeller 35, Left impeller inlet 36, Left impeller outlet 37, Right impeller inlet 38, Right impeller outlet 39, Left pump liquid chamber 4, Right pump liquid chamber 5, Supply pipe 6, Left inlet 61, Right inlet 62, Left branch pipe 63, Right branch pipe 64, Discharge pipe 7, Left outlet 71, Right outlet 72, Left drain pipe 73, Right drain pipe 74. Detailed Implementation

[0027] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] like Figures 1-4 As shown, a double-suction magnetic levitation pump includes a pump body assembly 2 and a motor body 1 mounted on the pump body assembly 2. A stator is installed inside the motor body 1, and a rotor 3 that cooperates with the stator is provided inside the pump body assembly 2. The pump body assembly 2 includes a left pump liquid chamber 4 and a right pump liquid chamber 5 symmetrically arranged along the motor body 1. A left impeller 34 and a right impeller 35 are respectively provided at both ends of the rotor 3. The rotor 3 is subjected to a liquid axial force of equal magnitude and opposite direction to the left impeller 34. Under the action of the left impeller 34 and the right impeller 35, the axial forces of the rotor 3 cancel each other out. The left impeller 34 is located in the left pump liquid chamber 4, and the right impeller 35 is located in the right pump liquid chamber 5. The pump body assembly 2 includes a left inlet 61 connected to the left pump liquid chamber 4 and a right inlet 62 connected to the right pump liquid chamber 5. The liquid inlet direction of the left inlet 61 is opposite to the liquid inlet direction of the right inlet 62.

[0029] The rotor 3 is suspended inside the pump body assembly 2. The stator and rotor 3 are driven by magnetic coupling. During the rotation of the rotor 3, the left impeller 34 in the left pump liquid chamber 4 and the right impeller 35 in the right pump liquid chamber 5 are driven to rotate synchronously. The rotation of the left impeller 34 and the right impeller 35 generates centrifugal force, which completes the suction and discharge of liquid in the left pump liquid chamber 4 and the right pump liquid chamber 5.

[0030] The pump body assembly 2 includes a left pump housing 21 and a right pump housing 22 connected to each other. A left pump cover 25 for forming a left pump liquid chamber 4 is connected to the left pump housing 21, and a right pump cover 26 for forming a right pump liquid chamber 5 is connected to the right pump housing 22.

[0031] The left pump housing 21 and the right pump housing 22 are connected to form the main structure of the pump body assembly 2. The left pump cover 25 is fixedly connected to the left pump housing 21 by bolts. The left pump housing 21 and the left pump cover 25 form the left pump liquid chamber 4. The right pump cover 26 is fixedly connected to the right pump housing 22 by bolts. The right pump housing 22 and the right pump cover 26 form the right pump liquid chamber 5. The left pump liquid chamber 4 and the right pump liquid chamber 5 are independent of each other and are symmetrically arranged along the center of the pump body assembly 2.

[0032] The left pump housing 21 and the right pump housing 22 are fixedly connected to the motor body 1 by bolts, thereby realizing the fixed installation of the motor body 1 on the pump body assembly 2.

[0033] The right pump housing 22 includes a pump housing body 23 for forming a right pump liquid chamber 5 with the right pump cover 26 and a sleeve body 24 for connecting the left pump housing 21. The motor body 1 is sleeved on the sleeve body 24, and the rotor 3 is installed in the sleeve body 24 with clearance fit.

[0034] A radial sealing ring 28 for radial sealing of the pump body assembly 2 is provided at the connection between the left pump housing 21 and the sleeve body 24, and a sealing cover plate 13 embedded in the pump housing body 23 is provided at the end of the motor body 1.

[0035] The sealing cover 13 is equipped with a bearing positioning structure or cooling channel as needed, which is used for auxiliary heat dissipation and axial limiting of the motor body 1.

[0036] The sleeve body 24 has an installation cavity for mounting the rotor 3. The left impeller 34 and the right impeller 35 at both ends of the rotor 3 extend to the outside of both ends of the sleeve body 24, so that the left impeller 34 and the right impeller 35 are respectively located in the left pump liquid chamber 4 and the right pump liquid chamber 5.

[0037] A left sealing ring 27 for radial sealing of the left pump chamber 4 is provided at the connection between the left pump housing 21 and the left pump cover 25, and a right sealing ring 29 for radial sealing of the right pump chamber 5 is provided at the connection between the right pump housing 22 and the right pump cover 26. Under the action of the left sealing ring 27 and the right sealing ring 29, the left pump chamber 4 and the right pump chamber 5 are always kept in a relatively sealed state.

[0038] The rotor 3 includes an impeller base 31 for synchronously driving the left impeller 34 and the right impeller 35 to rotate. The left impeller 34 and the right impeller 35 are respectively fixed at opposite ends of the impeller base 31. The left impeller 34 and the right impeller 35 can be set at opposite ends of the impeller base 31 by welding or integral molding. The impeller base 31 is integrally machined or precision cast, and the left impeller 34 and the right impeller 35 are symmetrically arranged along the center of the impeller base 31.

[0039] A left permanent magnet 32 ​​corresponding to the left impeller 34 and a right permanent magnet 33 corresponding to the right impeller 35 are pressed into the impeller base 31 by interference fitting. The left permanent magnet 32 ​​and the right permanent magnet 33 are symmetrically arranged on the impeller base 31, with the left permanent magnet 32 ​​and the right permanent magnet 33 arranged with their S poles facing each other, and the left permanent magnet 32 ​​and the right permanent magnet 33 form a symmetrical closed loop in the pump body assembly 2.

[0040] The left permanent magnet 32 ​​corresponding to the left impeller 34 has its S pole facing to the right, and the right permanent magnet 33 corresponding to the right impeller 35 has its S pole facing to the left. The S poles of the left permanent magnet 32 ​​and the right permanent magnet 33 are facing each other and arranged coaxially, forming a magnetic field structure with "double S poles facing each other".

[0041] Magnetic lines of force radiate outward from the N pole of the left permanent magnet 32, pass through the left pump casing 21 and enter the impeller base 31. The magnetic lines of force within the impeller base are symmetrically split and extend to the left and right sides respectively, reaching the S poles of the left permanent magnet 32 ​​and the right permanent magnet 33 (the left and right S poles are opposite each other, forming a "magnetic line converging surface"). The magnetic lines of force of the right permanent magnet 33 radiate outward from the N pole, pass through the right pump casing 22 and flow back to the impeller base 31, and finally close symmetrically with the left magnetic circuit, forming a complete loop of "N pole → pump casing → impeller base 31 → S pole → interior of permanent magnet → N pole".

[0042] Therefore, the S poles of the left permanent magnet 32 ​​and the right permanent magnet 33 are positioned opposite each other at both ends of the impeller base 31. The magnetic lines of force are symmetrical about the left and right permanent magnets 32 and 33. Through the magnetic conduction between the pump casing and the impeller base 31, the magnetic field is closed with almost no leakage, resulting in high magnetic field utilization and high driving efficiency. The symmetrical magnetic lines of force cancel each other out the radial magnetic forces on the impeller base 31, eliminating unilateral force. This results in low vibration and low noise during rotation, making it suitable for high-speed and high-pressure conditions. The symmetrical magnetic circuit ensures a uniform magnetic field distribution in the circumferential direction of the impeller base 31, resulting in smooth torque transmission without pulsation.

[0043] The impeller base 31 has symmetrical permanent magnet mounting slots along the axial direction inside the hub for mounting the left permanent magnet 32 ​​and the right permanent magnet 33. The number of left permanent magnets 32 and right permanent magnets 33 is set according to actual needs, and the number of corresponding permanent magnet mounting slots is set according to the number of left permanent magnets 32 and right permanent magnets 33. Both left permanent magnets 32 and right permanent magnets 33 are pressed into the corresponding permanent magnet mounting slots by interference fit. The left permanent magnets 32 and right permanent magnets 33 are preferably neodymium iron boron N52SH grade.

[0044] The stator includes a magnetic silicon steel 12 and a stator drive coil 11 wound in the magnetic silicon steel 12 with a three-phase distributed winding. The magnetic silicon steel 12 is embedded in the motor body 1.

[0045] The magnetic silicon steel 12 is embedded in the inner wall of the motor body 6. The magnetic silicon steel 12 is formed by stacking several silicon steel sheets to reduce eddy current loss. The stator drive coil 11 is wound in the slot of the magnetic silicon steel 12 using a three-phase distributed winding. The outer layer of the stator drive coil 11 is impregnated with high-temperature resistant insulating resin.

[0046] The number of stator drive coils 11 is set according to actual needs. The stator drive coils 11 generate a controllable magnetic field, which makes the impeller base 31, which is embedded with the left permanent magnet 32 ​​and the right permanent magnet 33, stably levitate. Under the levitation effect of the stator drive coils 11, the impeller base 31 is installed in the sleeve body 24 with a gap fit, so that the impeller base 31 has no physical contact with the sleeve body 24. The gap between the impeller base 31 and the sleeve body 24 is a composite area of ​​fluid lubrication and magnetic field levitation.

[0047] The electromagnetic field of the stator drive coil 11 is coupled with the left permanent magnet 32 ​​and the right permanent magnet 33 of the impeller base 31, generating torque to drive the impeller base 31 to rotate at high speed. The high-speed rotation of the impeller base 31 synchronously drives the left impeller 34 in the left pump liquid chamber 4 and the right impeller 35 in the right pump liquid chamber 5 to rotate at high speed.

[0048] The rotation of the left impeller 34 and the right impeller 35 generates centrifugal force and axial thrust to complete the liquid intake and discharge. The entire process is free of mechanical friction, wear, and leakage.

[0049] A left outlet 71 is formed on the left pump liquid chamber 4 and communicates with the left pump liquid chamber 4. A left impeller inlet 36 corresponding to the left inlet 61 is formed in the middle of the left impeller 34. A left impeller outlet 37 corresponding to the left outlet 71 is formed in the circumferential direction of the left impeller 34. A right outlet 72 is formed on the right pump liquid chamber 5 and communicates with the right pump liquid chamber 5. A right impeller inlet 38 corresponding to the right inlet 62 is formed in the middle of the right impeller 35. A right impeller outlet 39 corresponding to the right outlet 72 is formed in the circumferential direction of the right impeller 35.

[0050] The pump body assembly 2 is connected to a supply pipe 6 for simultaneously supplying liquid to the left inlet 61 and the right inlet 62. The supply pipe 6 includes a left diverter pipe 63 connected to the left inlet 61 and a right diverter pipe 64 connected to the right inlet 62. The pump body assembly 2 is connected to an outlet pipe 7 for simultaneously receiving fluid from the left inlet 61 and the right inlet 62. The outlet pipe 7 includes a left drain pipe 73 connected to the left outlet 71 and a right drain pipe 74 connected to the right outlet 72.

[0051] In actual use, the left and right inlet ports 61 and 62 are simultaneously fed into the liquid supply pipe 6 through the left and right branch pipes 63 and 64, so that the liquid enters the left pump chamber 4 and the right pump chamber 5 in the same amount. The electromagnetic field of the stator drive coil 11 is coupled with the left permanent magnet 32 ​​and the right permanent magnet 33 of the impeller base 31, generating torque to drive the impeller base 31 to rotate at high speed. The high-speed rotation of the impeller base 31 synchronously drives the left impeller 34 in the left pump chamber 4 and the right impeller 35 in the right pump chamber 5 to rotate at high speed.

[0052] The left impeller 34 and the right impeller 35 rotate synchronously in the same direction under the action of the impeller base 31. The liquid in the left pump liquid chamber 4 and the right pump liquid chamber 5 is pressurized by centrifugal force and impeller guiding action. The pressurized liquid is discharged from the left inlet 61 and the right inlet 62 respectively. After being smoothly mixed through the T-shaped liquid outlet pipe 7, it is output to the downstream pipeline through the common outlet.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention; therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0054] Although this article uses many reference numerals from the figures: motor body 1, stator drive coil 11, magnetic silicon steel 12, sealing cover 13, pump body assembly 2, left pump casing 21, right pump casing 22, pump casing body 23, sleeve body 24, left pump cover 25, right pump cover 26, left sealing ring 27, radial sealing ring 28, right sealing ring 29, rotor 3, impeller base 31, left permanent magnet 32, right permanent magnet 33, left impeller 34, right impeller 35, left impeller inlet 36, left impeller outlet 37, right impeller inlet 38, right impeller outlet 39, left pump liquid chamber 4, right pump liquid chamber 5, supply pipe 6, left inlet 61, right inlet 62, left diverter pipe 63, right diverter pipe 64, outlet pipe 7, left outlet 71, right outlet 72, left drain pipe 73, right drain pipe 74, etc., the possibility of using other terms cannot be excluded. The use of these terms is merely for the convenience of describing and explaining the nature of the invention; interpreting them as any additional limitation would be contrary to the spirit of the invention.

Claims

1. A double-suction magnetic levitation pump, comprising a pump body assembly (2) and a motor body (1) mounted on the pump body assembly (2), wherein a stator is installed inside the motor body (1), and a rotor (3) cooperating with the stator is provided inside the pump body assembly (2); characterized in that, The pump body assembly (2) includes a left pump liquid chamber (4) and a right pump liquid chamber (5) symmetrically arranged along the motor body (1). The rotor (3) is provided with a left impeller (34) and a right impeller (35) at both ends, which are subjected to the same pressure magnitude and opposite direction of the liquid axial force. The axial forces of the rotor (3) cancel each other out under the action of the left impeller (34) and the right impeller (35). The left impeller (34) is located in the left pump liquid chamber (4), and the right impeller (35) is located in the right pump liquid chamber (5). The pump body assembly (2) includes a left inlet (61) connected to the left pump liquid chamber (4) and a right inlet (62) connected to the right pump liquid chamber (5). The liquid inlet direction of the left inlet (61) is opposite to that of the right inlet (62).

2. The double suction magnetic levitation pump according to claim 1, characterized in that The pump assembly (2) includes a left pump housing (21) and a right pump housing (22) connected together. A left pump cover (25) for forming a left pump liquid chamber (4) is connected to the left pump housing (21), and a right pump cover (26) for forming a right pump liquid chamber (5) is connected to the right pump housing (22).

3. The double suction magnetic levitation pump according to claim 2, characterized in that The right pump housing (22) includes a pump housing body (23) for forming a right pump liquid chamber (5) with the right pump cover (26) and a sleeve body (24) for connecting the left pump housing (21). The motor body (1) is sleeved on the sleeve body (24), and the rotor (3) is installed in the sleeve body (24) with clearance fit.

4. The double suction magnetic levitation pump according to claim 3, characterized in that The left pump housing (21) is provided with a radial sealing ring (28) for radial sealing of the pump body assembly (2) at the connection between the sleeve body (24), and the motor body (1) is provided with a sealing cover plate (13) embedded in the pump housing body (23).

5. The double suction magnetic levitation pump according to claim 2, characterized in that The left pump housing (21) and the left pump cover (25) are provided with a left sealing ring (27) for radial sealing of the left pump liquid chamber (4), and the right pump housing (22) and the right pump cover (26) are provided with a right sealing ring (29) for radial sealing of the right pump liquid chamber (5).

6. The double suction magnetic levitation pump according to claim 1, characterized in that The rotor (3) includes an impeller base (31) for synchronously driving the left impeller (34) and the right impeller (35) to rotate, with the left impeller (34) and the right impeller (35) fixed at opposite ends of the impeller base (31).

7. A double suction magnetic levitation pump according to claim 6, characterized in that The impeller base (31) is press-fitted with a left permanent magnet (32) corresponding to the left impeller (34) and a right permanent magnet (33) corresponding to the right impeller (35). The left permanent magnet (32) and the right permanent magnet (33) are symmetrically arranged on the impeller base (31), with the left permanent magnet (32) and the right permanent magnet (33) arranged with their S poles facing each other. The left permanent magnet (32) and the right permanent magnet (33) form a symmetrical closed loop in the pump body assembly (2).

8. The double suction magnetic levitation pump according to claim 1, characterized in that The stator includes magnetic silicon steel (12) and stator drive coils (11) wound in the magnetic silicon steel (12) using three-phase distributed windings. The magnetic silicon steel (12) is embedded in the motor body (1).

9. The double suction magnetic levitation pump according to claim 1, characterized in that The left pump chamber (4) has a left outlet (71) connected to the left pump chamber (4), the left impeller (34) has a left impeller inlet (36) corresponding to the left inlet (61) in the middle, the left impeller (34) has a left impeller outlet (37) corresponding to the left outlet (71) in the circumferential direction, the right pump chamber (5) has a right outlet (72) connected to the right pump chamber (5), the right impeller (35) has a right impeller inlet (38) corresponding to the right inlet (62) in the middle, and the right impeller (35) has a right impeller outlet (39) corresponding to the right outlet (72) in the circumferential direction.

10. The double suction magnetic levitation pump according to claim 9, characterized in that The pump assembly (2) is connected to a supply pipe (6) for simultaneously supplying liquid to the left inlet (61) and the right inlet (62). The supply pipe (6) includes a left diverter pipe (63) connected to the left inlet (61) and a right diverter pipe (64) connected to the right inlet (62). The pump assembly (2) is connected to an outlet pipe (7) for simultaneously receiving fluid from the left inlet (61) and the right inlet (62). The outlet pipe (7) includes a left drain pipe (73) connected to the left outlet (71) and a right drain pipe (74) connected to the right outlet (72).

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