A three-way cooling permanent magnet multi-stage electric pump

Abstract

The invention discloses a three-way cooling permanent magnet multi-stage electric pump, comprising a pump body, which is provided with a water inlet and a water outlet, and also comprises a rotating shaft arranged inside the pump body, an armature and a controller are also arranged inside the pump body, a controller box cover is arranged outside the controller, a negative pressure fan is fixedly arranged at one end of the rotating shaft located away from the water inlet of the armature, a negative pressure chamber is formed inside the outer shell of the pump body at the negative pressure fan, the negative pressure chamber is communicated with the inside of the control box cover, an air outlet is formed on the outer shell wall of the pump body at the negative pressure fan; a controller water cooling circuit is arranged on the pipe wall at the connection between the inside of the pump body and the water outlet, and the controller cooling circuit extends to the inside of the controller box cover; a centrifugal chamber is arranged at the connection between the armature and the rotating shaft, a centrifugal fan is fixedly sleeved at the rotating shaft at the centrifugal chamber, an air outlet channel is formed at the bottom of the centrifugal chamber, and the air outlet channel is communicated to the outer end of the pump body. The heat dissipation effect inside the pump body is remarkable, the energy efficiency of the motor is improved, and the overall service life of the pump body is improved.

Description

Technical Field

[0001] The invention relates to a multi-stage electric pump, in particular to a three-way cooling permanent magnet multi-stage electric pump. Background Art

[0002] The traditional water pump drive part adopts an asynchronous squirrel cage motor. Without a frequency converter, the speed cannot be adjusted, and the market demand for variable pressure water pumps cannot be met. However, adding a frequency converter circuit to the asynchronous squirrel cage motor is complex and costly.

[0003] Compared with asynchronous squirrel cage motors, permanent magnet motors are easier to achieve frequency conversion and stepless speed regulation, and can well meet the market demand for variable pressure water pumps.

[0004] However, when a pump body using a permanent magnet motor is in use, heat will be generated inside the pump body, and the heat is particularly obvious at the armature and the controller position inside the pump body. The internal loss heat is mainly forced to cool by the fan at the rear end of the shaft. The internal heat is difficult to dissipate, the pump group has low working efficiency, consumes more electricity, and causes waste. Summary of the invention

[0005] The object of the present invention is to provide a three-way cooling permanent magnet multi-stage electric pump to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a three-way cooling permanent magnet multi-stage electric pump, comprising a pump body, a water inlet is provided on one side of the pump body, and a water outlet is provided on the top, and also comprises a rotating shaft arranged inside the pump body, the axis of the rotating shaft is opposite to the water inlet, the outer wall of the rotating shaft is connected to an armature, a controller and a controller box cover for protecting the controller are provided on the top of the pump body at the side of the water outlet, a pressure-maintaining tank is connected to the side of the pump body located at the water outlet away from the shell, a negative pressure fan is fixed to the end of the rotating shaft located at the armature away from the water inlet, a negative pressure chamber is formed inside the shell of the pump body at the negative pressure fan, and the negative pressure chamber is connected to the negative pressure chamber. The interior of the control box cover is connected, and the pump body is provided with a wind hood at the air outlet, and the wind hood is provided with an air outlet; a controller water cooling circuit is provided on the pipe wall at the connection between the interior of the pump body and the water outlet, and the controller cooling circuit extends to the inside of the controller box cover, and the head end and the tail end of the controller cooling circuit are respectively formed with a water inlet end and a water outlet end, and the water inlet end and the water outlet end are both connected to the inside of the water outlet; a centrifugal cavity is provided at the connection between the armature and the rotating shaft, and a centrifugal fan is fixedly provided on the rotating shaft located at the centrifugal cavity, and an air outlet channel is formed at the bottom of the centrifugal cavity, and the air outlet channel is connected to the outer end of the pump body.

[0007] Preferably, the controller water cooling circuit passes through the heat-conducting aluminum plate in the heat dissipation area of ​​the controller, and the outer wall is arranged in contact with the outer wall of the heat-conducting aluminum plate.

[0008] Preferably, a heat dissipation aluminum plate is provided at the connection between the air outlet channel and the outside of the pump body.

[0009] Preferably, the rotating shaft is connected to an impeller and a guide vane at one end of the water inlet, and the impeller and guide vane are provided in multiple groups along the axial direction of the rotating shaft and are arranged at intervals. The guide vane is fixedly connected to the internal structure of the pump body, and the impeller is fixedly mounted on the rotating shaft through a shaft sleeve.

[0010] Preferably, the pump body is provided with a water flow switch and a pressure sensor at the pipe of the water outlet, and the pressure sensor is electrically connected to the controller.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The present invention arranges a negative pressure fan and a centrifugal fan on the rotating shaft inside the pump body, wherein the negative pressure fan is located below the controller, and the centrifugal fan is arranged at the connection between the armature and the rotating shaft, and a controller water cooling circuit passing through the inside of the controller box cover is added to the pipeline at the water outlet. Through the three cooling methods, the heat dissipation effect of the permanent magnet motor driven by the pump is significant, the energy efficiency of the motor is significantly improved, and the overall energy efficiency and service life of the pump are improved; by arranging multiple sets of impellers and guide vanes in an open manner at the water inlet end of the rotating shaft, the water supply system is simplified, the space occupied is reduced, and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the overall structure of this embodiment;

[0015] Figure 2 It is a cross-sectional schematic diagram of the entire embodiment.

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0017] 1. Water inlet; 2. Water outlet; 3. Rotating shaft; 4. Armature; 5. Controller; 6. Controller box cover; 7. Pressure tank; 8. Negative pressure fan; 9. Negative pressure chamber; 10. Air outlet; 11. Controller water cooling circuit; 12. Water inlet end; 13. Water outlet end; 14. Centrifugal chamber; 15. Centrifugal fan; 16. Air outlet channel; 17. Heat dissipation aluminum plate; 18. Impeller; 19. Guide vane; 20. Water flow switch; 21. Pressure sensor; 22. Outer rotor magnetic tile; 23. Wind hood. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-2 The present invention provides a technical solution: a three-way cooling permanent magnet multi-stage electric pump, comprising a pump body, a water inlet is provided on one side of the pump body, and a water outlet is provided on the top, and also comprises a rotating shaft arranged inside the pump body, the axis of the rotating shaft is opposite to the water inlet, the outer wall of the rotating shaft is connected with an armature, a controller and a controller box cover for protecting the controller are provided on the top of the pump body at the side of the water outlet, a pressure maintaining tank is connected to the pump body at the side of the water outlet away from the shell, a negative pressure fan is fixed at the end of the rotating shaft located at the armature away from the water inlet, the negative pressure fan is sleeved on the rotating shaft through a shaft sleeve, a plane is milled at the shaft sleeve where the rotating shaft is connected to the negative pressure fan, a plane matching the plane is filled inside the shaft sleeve of the negative pressure fan, so that the negative pressure fan is fixed to the rotating shaft, a negative pressure cavity is formed inside the shell of the pump body at the negative pressure fan, and the negative pressure cavity is The inside of the control box cover is connected, and a wind hood is provided at the air outlet of the pump body, and the air outlet is provided on the wind hood; a controller water cooling circuit is provided on the pipe wall at the connection between the inside of the pump body and the water outlet, and the controller cooling circuit extends to the inside of the controller box cover, and the head end and the tail end of the controller cooling circuit are respectively formed with a water inlet end and a water outlet end, and the water inlet end and the water outlet end are both connected to the inside of the water outlet; a centrifugal chamber is provided at the connection between the armature and the rotating shaft, and the rotating shaft is located at the centrifugal chamber and a centrifugal fan is fixedly provided with a sleeve, and the centrifugal fan is fixed to the rotating shaft in a manner that a sleeve is sleeved on the rotating shaft, and then a fixing bolt passes through the sleeve and is fixed to the rotating shaft, and an air outlet channel is formed at the bottom of the centrifugal chamber, and the air outlet channel is connected to the outer end of the pump body; the negative pressure fan discharges the heat generated in the heat dissipation area of ​​the controller through the air outlet of the wind hood, and the direction is as follows Figure 2 The direction of the arrow in the middle is shown (refer to the arrow at the negative pressure chamber); the direction in which the centrifugal fan discharges the heat generated by the armature from the bottom of the pump body is as follows Figure 2 As shown by the arrow in the middle (refer to the arrows in the centrifugal chamber and the air outlet channel).

[0020] Specifically, the controller water cooling circuit passes through the heat-conducting aluminum plate in the heat dissipation area of ​​the controller, and the outer wall is fitted with the outer wall of the heat-conducting aluminum plate. The connecting pipe of the controller water cooling circuit is made of copper material. The controller water cooling circuit passes through the heat dissipation area of ​​the controller to effectively reduce the internal temperature. The controller water cooling circuit is fitted with the heat-conducting aluminum plate to increase the cooling effect. During the pumping process, water continuously passes through the controller water cooling circuit, making full use of the water cooling method to dissipate the heat in the heat dissipation area of ​​the controller.

[0021] Specifically, a heat dissipation aluminum plate is provided at the connection between the air outlet channel and the outside of the pump body, which can reduce the heat of the air discharged to the outside of the pump body through the centrifugal fan and accelerate the heat dissipation.

[0022] Specifically, the rotating shaft is located at one end of the water inlet and is connected to an impeller and a guide vane. The impeller and the guide vane are provided with multiple groups along the axial direction of the rotating shaft and are arranged at intervals. The guide vane is fixedly connected to the internal structure of the pump body. The impeller is fixedly sleeved on the rotating shaft through a shaft sleeve. The rotation of the impeller can suck external water into the pump body. The water source passing through the guide vane can increase the water flow pressure and form a unidirectional water flow of the water source, thereby maintaining the stable pumping of the pump body. It should be noted that there is a gap between the impeller and the guide vane, and the stability of the impeller following the rotation of the rotating shaft is guaranteed when the rotating shaft rotates. In the embodiment of the present invention, three groups of impellers are preferably used, and two groups of guide vanes are used, and one group of guide vanes is arranged between every two groups of impellers. The flow process of the medium water entering from the water inlet and discharged from the water outlet is as follows: Figure 2 As shown by the direction of the arrow in the middle (refer to the direction of the arrow in the channel between the water inlet and the water outlet).

[0023] Specifically, a water flow switch and a pressure sensor are provided at the pipe of the water outlet of the pump body. The pressure sensor is electrically connected to the controller. When the pump body is pumping water, the water flow switch will monitor the water flow and will feed back the instantaneous pressure signal to the pressure sensor. The user can know the instantaneous pressure of the water pump when pumping water through the pressure sensor. After the pressure sensor collects the instantaneous pressure, it transmits the signal to the controller. The controller can control the rotation speed of the outer rotor magnet through the armature, and the outer rotor magnet will drive the rotating shaft to rotate through the cast iron sleeve.

[0024] A specific application example of this embodiment is:

[0025] When the device is in use, after setting the controller parameters, the electric pump starts running, the working medium water is input from the water inlet and output from the water outlet, and the preset pressure and flow values ​​are maintained. The water flow switch and pressure sensor provide the controller with timely sampling of the water outlet and timely control of the electric pump running speed to ensure the required water pressure and flow. The pressure tank improves the pressure maintenance capacity during transient water shortage.

[0026] During the water pumping process of the pump body of the present invention, the rotation of the shaft will drive the rotation of the negative pressure fan, and the rotation of the negative pressure fan will discharge the heat generated by the operation of the motor and the heat-conducting aluminum plate at the bottom of the controller (not marked in the figure, located in the heat dissipation area of ​​the controller) from the inside through the air outlet on the wind cover 23; while the negative pressure fan rotates, the centrifugal fan in the centrifugal chamber rotates along with the shaft, and the rotation of the centrifugal fan will promptly discharge the heat generated by the armature during operation from the air outlet channel through the internal air-cooled heat-conducting aluminum plate; when the electric pump is working to extract medium water, the medium water will be discharged from the water outlet and will also flow through the controller water cooling circuit, thereby introducing the medium water into the controller heat dissipation area, and the heat generated by the high-power devices of the electric pump controller during operation will be promptly removed by the controller water cooling circuit. The above-mentioned three-way cooling system can realize long-term, efficient and reliable operation of the electric pump drive motor and controller, with significant energy-saving effects. Please refer to Figure 1-2 The present invention provides a technical solution: a three-way cooling permanent magnet multi-stage electric pump, including a pump body, a water inlet 1 is provided on one side of the pump body, and a water outlet 2 is provided on the top, and also includes a rotating shaft 3 arranged inside the pump body, the axis of the rotating shaft 3 is opposite to the water inlet 1, and the outer wall of the rotating shaft 3 is connected with an armature 4, a controller 5 and a controller box cover 6 for protecting the controller 5 are provided on the top of the pump body at the side of the water outlet 2, a pressure holding tank 7 is connected to the pump body at the side of the water outlet 2 away from the shell, a negative pressure fan 8 is fixed at the end of the rotating shaft 3 located at the armature 4 away from the water inlet 1, the negative pressure fan 8 is sleeved on the rotating shaft 3 through a shaft sleeve, a plane is milled at the shaft sleeve where the rotating shaft 3 is connected to the negative pressure fan 8, and a plane matching the plane is filled inside the shaft sleeve of the negative pressure fan 8, so that the negative pressure fan 8 is fixed to the rotating shaft 3, a negative pressure chamber 9 is formed inside the shell of the pump body at the negative pressure fan 8, and the negative pressure chamber 9 is communicated with the inside of the control box cover, the pump The body is provided with a hood 23 at the air outlet 10, and the hood 23 is provided with the air outlet 10; a controller water cooling circuit 11 is provided on the pipe wall at the connection between the inside of the pump body and the water outlet 2, and the controller 5 cooling circuit extends to the inside of the controller box cover 6, and the head end and the tail end of the controller 5 cooling circuit are respectively formed with a water inlet end 12 and a water outlet end 13, and the water inlet end 12 and the water outlet end 13 are both connected to the inside of the water outlet 2; a centrifugal chamber 14 is provided at the connection between the armature 4 and the rotating shaft 3, and the rotating shaft 3 is located at the centrifugal chamber 14 and is fixedly sleeved with a centrifugal fan 15. The centrifugal fan 15 is fixed to the rotating shaft 3 in the manner of being sleeved on the rotating shaft 3 through a shaft sleeve, and then passing through the shaft sleeve and fixed to the rotating shaft 3 through a fixing bolt, and an air outlet channel 16 is formed at the bottom of the centrifugal chamber 14, and the air outlet channel 16 is connected to the outer end of the pump body; the negative pressure fan 8 discharges the heat generated in the heat dissipation area of ​​the controller 5 from the air outlet 10 of the hood 23 in the direction as shown Figure 2 The direction of the arrow in the middle is shown (refer to the arrow at the negative pressure chamber 9); the direction of the centrifugal fan 15 discharging the heat generated by the armature 4 from the bottom of the pump body is as shown in Figure 2 As shown by the arrow in the middle (refer to the arrows at the centrifugal chamber 14 and the air outlet channel 16).

[0027] Specifically, the controller water cooling circuit 11 passes through the heat-conducting aluminum plate in the heat dissipation area of ​​the controller 5, and the outer wall is fitted with the outer wall of the heat-conducting aluminum plate. The connecting pipe of the controller water cooling circuit 11 is made of copper material. The controller water cooling circuit 11 passes through the heat dissipation area of ​​the controller 5 to effectively reduce the internal temperature. The controller water cooling circuit 11 is fitted with the heat-conducting aluminum plate to increase the cooling effect. During the pumping process, water continuously passes through the controller water cooling circuit 11, making full use of the water cooling method to dissipate the heat in the heat dissipation area of ​​the controller 5.

[0028] Specifically, a heat dissipation aluminum plate 17 is provided at the connection between the air outlet channel 16 and the outside of the pump body, which can reduce the heat of the air discharged to the outside of the pump body through the centrifugal fan 15 and accelerate the heat dissipation.

[0029] Specifically, the rotating shaft 3 is located at one end of the water inlet 1 and is connected with an impeller 18 and a guide vane 19. The impeller 18 and the guide vane 19 are both provided with multiple groups along the axial direction of the rotating shaft 3 and are arranged at intervals. The guide vane 19 is fixedly connected to the internal structure of the pump body. The impeller 18 is fixedly sleeved on the rotating shaft 3 through a shaft sleeve. The rotation of the impeller 18 can suck the external water source into the pump body. The water source passing through the guide vane 19 can increase the water flow pressure and form a unidirectional water flow of the water source, thereby maintaining the stable pumping of the pump body; it should be noted that there is a gap between the impeller 18 and the guide vane 19, and when the rotating shaft 3 rotates, the impeller 18 is guaranteed to rotate stably with the rotating shaft 3; in the embodiment of the present invention, the impeller 18 is preferably three groups, and the guide vane 19 is two groups, and a group of guide vanes 19 is arranged between every two groups of impellers 18; the flow process of the medium water entering from the water inlet 1 and being discharged from the water outlet 2 is as follows Figure 2 As shown by the direction of the arrow in the middle (refer to the direction of the arrow in the channel between the water inlet 1 and the water outlet 2).

[0030] Specifically, a water flow switch 20 and a pressure sensor 21 are provided at the pipeline of the water outlet 2 of the pump body. The pressure sensor 21 is electrically connected to the controller 5. When the pump body is pumping water, the water flow switch 20 will monitor the water flow and feed back the instantaneous pressure signal to the pressure sensor 21. The user can know the instantaneous pressure of the water pump when pumping water through the pressure sensor 21. After collecting the instantaneous pressure, the pressure sensor 21 transmits the signal to the controller 5. The controller 5 can control the rotation speed of the outer rotor magnet 22 through the armature 4, and the outer rotor magnet 22 will drive the rotating shaft 3 to rotate through the cast iron sleeve.

[0031] A specific application example of this embodiment is:

[0032] When the device is in use, after the parameters of the controller 5 are set, the electric pump starts to run, the working medium water is input from the water inlet 1 and output from the water outlet 2, and the preset pressure and flow values ​​are maintained. The water flow switch 20 and the pressure sensor 21 provide the controller 5 with timely sampling of the water output and timely control of the speed of the electric pump to ensure the required water pressure and flow. The pressure tank improves the pressure maintenance capacity during transient water shortage.

[0033] During the pumping process of the pump body of the present invention, the rotation of the rotating shaft 3 will drive the negative pressure fan 8 to rotate, and the rotation of the negative pressure fan 8 will discharge the heat generated by the motor and the heat-conducting aluminum plate at the bottom of the controller 5 (not marked in the figure, located in the heat dissipation area of ​​the controller 5) from the inside through the air outlet 10 on the wind cover 23; while the negative pressure fan 8 rotates, the centrifugal fan 15 in the centrifugal chamber 14 rotates along with the rotating shaft 3, and the rotation of the centrifugal fan 15 will timely discharge the heat generated by the armature 4 during operation from the air outlet channel through the internal air-cooled heat-conducting aluminum plate; when the electric pump is working to extract medium water, the medium water will be discharged from the water outlet 2 and will also flow through the controller water cooling circuit 11, thereby introducing the medium water into the heat dissipation area of ​​the controller 5, and the heat generated by the high-power devices of the electric pump controller 5 during operation will be timely taken away by the controller water cooling circuit 11. Through the above three-way cooling system, the electric pump drive motor and the controller 5 can be operated efficiently and reliably for a long time, and the energy-saving effect is remarkable.

[0034] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-way cooling permanent magnet multi-stage electric pump, comprising a pump body, a water inlet (1) is provided on one side of the pump body, and a water outlet (2) is provided on the top of the pump body, and further comprising a rotating shaft (3) arranged inside the pump body, the axis of the rotating shaft (3) is opposite to the water inlet (1), the outer wall of the rotating shaft (3) is connected to an armature (4), a controller (5) and a controller box cover (6) for protecting the controller (5) are provided on the top of the pump body located on the side of the water outlet (2), and a pressure-maintaining tank (7) is connected to the side of the pump body located on the side of the water outlet (2) away from the housing, characterized in that: A negative pressure fan (8) is fixed to the end of the rotating shaft (3) located away from the water inlet (1) of the armature (4); a negative pressure chamber (9) is formed inside the housing of the pump body at the negative pressure fan (8); the negative pressure chamber (9) is communicated with the inside of the controller box cover (6); a wind cover (23) is provided at the air outlet (10) of the pump body; the air outlet (10) is provided on the wind cover (23); a controller water cooling circuit (11) is provided on the pipe wall at the connection between the inside of the pump body and the water outlet (2); the cooling circuit of the controller (5) extends The controller (5) extends to the inside of the controller box cover (6), and the head end and the tail end of the cooling circuit of the controller (5) are respectively formed with a water inlet end (12) and a water outlet end (13), and the water inlet end (12) and the water outlet end (13) are both connected to the inside of the water outlet (2); a centrifugal chamber (14) is provided at the connection between the armature (4) and the rotating shaft (3), and a centrifugal fan (15) is fixedly sleeved on the rotating shaft (3) located at the centrifugal chamber (14), and an air outlet channel (16) is formed at the bottom of the centrifugal chamber (14), and the air outlet channel (16) is connected to the outer end of the pump body; The rotation of the rotating shaft (3) drives the negative pressure fan (8) to rotate. The rotation of the negative pressure fan (8) discharges the heat generated by the operation of the motor and the heat-conducting aluminum plate at the bottom of the controller (5) from the inside through the air outlet (10) on the wind cover (23); while the negative pressure fan (8) rotates, the centrifugal fan (15) in the centrifugal chamber (14) rotates along with the rotating shaft (3). The rotation of the centrifugal fan (15) discharges the heat generated by the operation of the armature (4) from the air outlet channel in a timely manner through the internal air-cooled heat-conducting aluminum plate; when the electric pump is working to extract medium water, the medium water is discharged from the water outlet (2) and also flows through the controller water cooling circuit (11), thereby introducing the medium water into the heat dissipation area of ​​the controller (5), and the heat generated by the high-power device of the electric pump controller (5) during operation is promptly taken away by the controller water cooling circuit (11).

2. A three-way cooling permanent magnet multi-stage electric pump according to claim 1, characterized in that: The controller water cooling circuit (11) passes through the heat-conducting aluminum plate in the heat dissipation area of ​​the controller (5), and the outer wall is arranged in contact with the outer wall of the heat-conducting aluminum plate.

3. A three-way cooling permanent magnet multi-stage electric pump according to claim 1, characterized in that: A heat dissipation aluminum plate (17) is provided at the connection between the air outlet channel (16) and the outside of the pump body.

4. A three-way cooling permanent magnet multi-stage electric pump according to claim 1, characterized in that: The rotating shaft (3) is connected to an impeller (18) and a guide vane (19) at one end of the water inlet (1); the impeller (18) and the guide vane (19) are provided in multiple groups along the axial direction of the rotating shaft (3) and are arranged at intervals; the guide vane (19) is fixedly connected to the internal structure of the pump body; and the impeller (18) is fixedly sleeved on the rotating shaft (3) via a shaft sleeve.

5. A three-way cooling permanent magnet multi-stage electric pump according to claim 1, characterized in that: The pump body is provided with a water flow switch (20) and a pressure sensor (21) at the pipe of the water outlet (2), and the pressure sensor (21) is electrically connected to the controller (5).

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