Magnetic fluid axial force intelligent balance system

Abstract

The invention relates to a magnetofluid axial force intelligent balance system which comprises a control module and a magnetofluid damper, an operation parameter sensing module, an intelligent algorithm module and a regulation and control module are arranged in the control module, and the magnetofluid damper is arranged on a water pump main shaft; the operation parameter sensing module is used for acquiring current operation parameters of the water pump in real time; the intelligent algorithm module is used for calculating a current axial force based on a current operation parameter of the water pump, calculating a current balance force required by the magnetofluid damper based on the current axial force, and calculating a regulation and control current required by the magnetofluid damper according to the current balance force; and the regulation and control module regulates and controls the magnetofluid damper based on the regulation and control current. The device has the effects of realizing real-time axial force monitoring and quantitative balance adjustment.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent control of water pumps, and in particular to a magnetic fluid axial force intelligent balancing system. Background Art

[0002] The balancing problem of pump axial force is an important technical challenge faced by high-lift centrifugal pumps, especially in high-power, high-speed and heavy-load situations. The calculation, evaluation and balancing of the axial force of centrifugal pumps is a technical difficulty.

[0003] For example, the Chinese patent application number 201811392530X proposes an axial force balancing device for a centrifugal pump based on magnetic induction, and proposes that the electromagnetic coil is energized to generate a compensating axial force. However, the above does not reflect how much axial force is generated, and the details of the implementation are not presented.

[0004] For example, the Chinese patent application number 2022110362037 proposes a high-speed centrifugal pump axial force balance structure and prediction, and proposes a high-speed pump axial force prediction method, but this is based on numerical calculation (CFD) and cannot obtain the axial force value in real time and quickly.

[0005] For example, the Chinese patent with application number 2019112846610 proposes an axial force balance structure for a large-flow and high-power preload pump. The patent proposes a method of adjusting the structural layout of the preload pump to actively control the internal flow circulation of the preload pump, but the specific implementation strategy is that multiple fluid cavities and sealing structures cooperate with each other.

[0006] For example, the Chinese patent application number 2019102254541 proposes an axial force balancing device and design method for a single-stage radial turbine expander. The patent focuses on the difference in axial force during turbine startup and normal operation, and proposes a calculation formula. However, there is a big difference between the pump and the turbine. The turbine starts and builds up pressure, but the pump has no relative positive pressure, and the speed increase relationship is completely different.

[0007] Regarding the above-mentioned related technologies, the inventor currently has many patents and technical reports that propose suggestions for the balance and suppression of axial force, but lack real-time axial force monitoring and quantitative balance adjustment, so there is room for improvement. Summary of the invention

[0008] In order to achieve real-time axial force monitoring and quantitative balance adjustment, the present application provides a magnetic fluid axial force intelligent balancing system.

[0009] The magnetic fluid axial force intelligent balancing system provided in this application adopts the following technical solution: A magnetic fluid axial force intelligent balancing system comprises a control module and a magnetic fluid damper, wherein the control module is provided with an operating parameter sensing module, an intelligent algorithm module and a control module, and the magnetic fluid damper is provided on a main shaft of a water pump; The operating parameter sensing module is used to obtain the current operating parameters of the water pump in real time; The intelligent algorithm module calculates the current axial force based on the current operating parameters of the water pump, calculates the current balancing force required by the magnetofluid damper based on the current axial force, and calculates the control current required by the magnetofluid damper according to the current balancing force; the control module controls the magnetofluid damper based on the control current.

[0010] Preferably, the intelligent algorithm module calculates the current axial force based on the current operating parameters of the water pump, and the calculation formula of the current axial force is as follows: Where F1 is the current axial force, is the equivalent pressure of the front and rear covers of the impeller, A is the cross-sectional area of ​​the outlet disc of the impeller, Q is the flow rate of the pump, η is the hydraulic efficiency of the pump, s is the cross-sectional area of ​​the inlet of the pump, C1 and C2 are correction parameters; The calculation formula of the impeller outlet disc cross-sectional area is as follows: A=0.25*3.14*D 2 ; Where D is the outlet disc diameter of the impeller.

[0011] Preferably, the intelligent algorithm module calculates the current balancing force required by the magnetic fluid damper based on the current axial force, and calculates the control current required by the magnetic fluid damper according to the current balancing force; The current balance force calculation formula is as follows: F′= α F1; In the formula, F′ is the current balance force, F1 is the current axial force, α is the proportional parameter, and the value of α is 1.2~1.3; The magnetic fluid damper generates a current balancing force through the synchronous action of the main damping force and the auxiliary damping force, F′=F2+F3=αF1, wherein F2 is the main damping force and F3 is the auxiliary damping force; F2=sgnγ(a0 + a1I+a2I 2 +a3I 3 ); F3=C3F2 / λ; Where sgnγ is the sign function of the viscosity of the magnetic fluid in the magnetic fluid damper, a0, a1, a2, a3 are fitting coefficients, C3 is the correction coefficient, and λ is the opening of the connecting caliber formed by the distribution plate in the magnetic fluid damper; The calculation formula between the viscosity of the magnetic fluid and the control current in the magnetic fluid damper is as follows: γ=γ0+KH n ; H = nI; Where γ0 is the initial magnetic fluid viscosity of the magnetic fluid damper, K is the correction coefficient, H is the magnetic field strength of the magnetic induction coil in the magnetic fluid damper, and n is the number of turns of the magnetic induction coil.

[0012] Preferably, the control module inputs a control current into the magnetic fluid damper to control the magnetic fluid damper to generate a current balancing force with a dynamic response lag, and the control module inputs the control current within the dynamic response lag; the calculation formula of the dynamic response lag is as follows: τ=(L M C M +L R C M +L M C L +LC L ) / R M R L ; Where, L M and R M are the equivalent inductance and resistance of the MFD damper, L and R L is the circuit inductance and resistance of the control module, C M and C L is the equivalent resistance of the capacitor element.

[0013] Preferably, the magnetic fluid damper comprises a damper body, a damping chamber is arranged in the damper body, a connecting shaft is passed through the damper body, and the connecting shaft is coaxially connected to the main shaft of the water pump; The connecting shaft is provided with a connecting sleeve, and the connecting sleeve is provided with a piston disc in contact with the inner wall of the damping chamber, and the piston disc divides the damping chamber into a left chamber and a right chamber, and the left chamber and the right chamber are filled with magnetic fluid, and the piston disc is provided with a plurality of flow openings arranged at intervals along the circumferential direction; The damping chamber is provided with a flow distribution component for adjusting the flow rate of the flow port on the piston disc; The damper body is coated with a magnetic induction coil, and the control module is used to input a control current into the magnetic induction coil to generate a main damping force through the magnetic fluid, and to adjust the flow rate of the flow port through the distribution component to generate a secondary damping force, and to generate a current balancing force through the synchronous action of the main damping force and the secondary damping force.

[0014] Preferably, the flow distribution assembly comprises a mounting plate and a flow distribution plate, wherein the mounting plate is fixed in the damper body, the mounting plate is sleeved outside the connecting sleeve, a flow cavity is formed between the end surface of the mounting plate and the piston disc, a plurality of flow distribution channels are spaced apart in the circumferential direction in the mounting sleeve, one end of the flow distribution channel is communicated with the flow cavity, and the other end of the flow distribution channel is communicated with the inner wall surface of the mounting sleeve; The distribution disc is rotatably installed in the installation sleeve, and a plurality of distribution ports are spaced apart along the circumferential direction on the distribution disc. A driving part is arranged outside the damper body, and the driving part is used to drive the distribution disc to rotate so as to adjust the connecting aperture opening between the distribution port and the distribution channel.

[0015] Preferably, the driving part includes a driving handle, which is arranged on the distribution plate and extends outside the damper body; or the driving part includes a driving motor, which is fixedly arranged on the damper body, and a driving gear is installed on the output shaft of the driving motor, and a linkage gear meshing with the driving gear is mounted on the outer circumference of the distribution plate.

[0016] Preferably, a left end cover and a right end cover are installed at both ends of the damper, and the left end cover and the right end cover seal the damping chamber. A connecting port for the connecting shaft to pass through is provided in the left end cover and the right end cover, and a rotating bearing cooperating with the connecting shaft is provided in the connecting port. A sealing cover which is sleeved on the connecting shaft and seals the connecting port is provided on the left end cover and the right end cover.

[0017] Preferably, the mounting plate is provided with a mounting edge, the distribution plate is provided with a driving edge, the mounting edge is fixed to the end of the damper body, the driving edge is pressed against the right end cover and the mounting edge, a plurality of arc holes are provided at circumferential intervals on the driving edge, the right end cover is provided with mounting bolts that pass through the ends of the arc holes and are threadedly connected to the mounting edge, and the right end cover and the driving edge are sealed by a labyrinth sealing ring.

[0018] Preferably, a mounting interlayer is provided inside the damper body, and the magnetic induction coil is arranged in the mounting interlayer.

[0019] In summary, the present application includes at least one of the following beneficial technical effects: This application obtains the current operating parameters of the water pump in real time through the operating parameter sensing module, and the intelligent algorithm module calculates the current axial force of the water pump in real time, and then generates the current balancing force through the magnetofluid damper according to the current axial force to balance the axial force of the water pump, thereby realizing real-time axial force monitoring and quantitative balance adjustment, with high control efficiency and good intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the installation diagram of the magnetic fluid damper.

[0021] Figure 2 It is the system block diagram of the magnetic fluid axial force intelligent balancing system.

[0022] Figure 3 It is a structural schematic diagram of a magnetofluid damper.

[0023] Figure 4 It is a cross-sectional schematic diagram of a magnetofluid damper.

[0024] Figure 5 yes Figure 4 Schematic diagram of the cross section along the line A-A'.

[0025] Figure 6 It is the installation diagram of the mounting plate and the distribution plate.

[0026] Explanation of the reference numerals: 1. magnetofluid damper; 101. damper body; 102. damping chamber; 103. connecting shaft; 104. left end cover; 105. right end cover; 106. rotating bearing; 107. sealing cover; 108. connecting sleeve; 109. piston disc; 110. left chamber; 111. right chamber; 112. flow port; 113. magnetic induction coil; 114. mounting disc; 115. distribution disc; 116. flow chamber; 117. distribution channel; 118. mounting edge; 119. driving edge; 120. labyrinth sealing ring; 121. distribution port; 122. driving unit. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-6 This application is described in further detail.

[0028] A magnetic fluid axial force intelligent balancing system, referring to Figure 1 and Figure 2 As shown, it includes a control module and a magnetic fluid damper 1. The control module is provided with an operating parameter sensing module, an intelligent algorithm module and a regulation module. The magnetic fluid damper 1 is provided on the main shaft of the water pump.

[0029] The operating parameter sensing module is used to obtain the current operating parameters of the water pump in real time. The current operating parameters include the basic parameters of the water pump and the operating parameters of the water pump. The basic parameters of the water pump include the outlet disc cross-sectional area of ​​the impeller, the hydraulic efficiency of the water pump, the inlet cross-sectional area of ​​the water pump, the head, etc. The operating parameters of the water pump include the equivalent pressure of the front and rear cover plates of the impeller, the flow rate of the water pump, the speed of the water pump, etc. The operating parameter sensing module is composed of several sensors. If the corresponding water pump data needs to be collected, the corresponding sensors can be arranged for collection.

[0030] The intelligent algorithm module calculates the current axial force based on the current operating parameters of the water pump, calculates the current balancing force required by the magnetic fluid damper 1 based on the current axial force, and calculates the control current required by the magnetic fluid damper 1 according to the current balancing force.

[0031] The control module controls the magnetic fluid damper 1 based on the control current.

[0032] The present application obtains the current operating parameters of the water pump in real time through the operating parameter sensing module, and the intelligent algorithm module calculates the current axial force of the water pump in real time, and then generates the current balancing force through the magnetofluid damper 1 according to the current axial force to balance the axial force of the water pump, thereby realizing real-time axial force monitoring and quantitative balance adjustment, with high control efficiency and good intelligence.

[0033] The structure of the magnetic fluid damper 1 will be described in detail below.

[0034] Reference Figure 3 and Figure 4 As shown, the magnetic fluid damper 1 includes a damper body 101, which is cylindrically arranged. A damping cavity 102 is arranged in the damper body 101. The damping cavity 102 passes through both ends of the damper body 101. A connecting shaft 103 is passed through the damper body 101. A left end cover 104 and a right end cover 105 are installed at both ends of the damper. The left end cover 104 and the right end cover 105 seal the damping cavity 102. A connecting port for the connecting shaft 103 to pass through is arranged in the left end cover 104 and the right end cover 105. A rotating bearing 106 cooperating with the connecting shaft 103 is arranged in the connecting port. A sealing cover 107 which is sleeved on the connecting shaft 103 and seals the connecting port is arranged on the left end cover 104 and the right end cover 105.

[0035] The connecting shaft 103 is coaxially connected to the water pump main shaft, that is, the rotating shaft of the motor and the rotating shaft of the water pump form the water pump main shaft, the magnetic fluid damper 1 is arranged between the water pump and the motor, one end of the connecting shaft 103 is connected to the rotating shaft of the water pump through the connecting shaft 103, and the other end of the connecting shaft 103 is connected to the rotating shaft of the motor through a coupling.

[0036] A connecting sleeve 108 is provided on the connecting shaft 103, and the connecting sleeve 108 is coaxially fixed on the connecting shaft 103 through a flat key. A piston disk 109 is provided on the connecting sleeve 108 and contacts the inner wall of the damping chamber 102. The piston disk 109 divides the damping chamber 102 into a left chamber 110 and a right chamber 111. The left chamber 110 and the right chamber 111 are filled with magnetic fluid. A plurality of flow openings 112 arranged at intervals are opened on the piston disk 109 along the circumferential direction, and the flow openings 112 are used to connect the left chamber 110 and the right chamber 111.

[0037] A flow distribution component for adjusting the flow rate of the flow port 112 on the piston disc 109 is arranged in the damping chamber 102 .

[0038] The damper body 101 is covered with a magnetic induction coil 113. The control module is used to input a control current into the magnetic induction coil 113 to generate a main damping force through the magnetic fluid, and to adjust the flow rate of the flow port 112 through the distribution component to generate a secondary damping force, and to generate a current balancing force through the synchronous action of the main damping force and the secondary damping force.

[0039] Specifically, refer to Figure 4 , Figure 5 and Figure 6 As shown, the flow distribution assembly includes a mounting plate 114 and a flow distribution plate 115. The mounting plate 114 is fixed in the damper body 101, and the mounting plate 114 is sleeved on the outside of the connecting shaft sleeve 108. The outer wall of the mounting plate 114 abuts against the damping cavity 102. A flow cavity 116 is formed between the end surface of the mounting plate 114 and the piston disc 109. A plurality of flow distribution channels 117 are spaced apart along the circumferential direction in the mounting sleeve. Each flow distribution channel 117 is arranged in a square shape along the axial direction of the mounting sleeve. One end of the flow distribution channel 117 is communicated with the flow cavity 116, and the other end of the flow distribution channel 117 is communicated with the inner wall surface of the mounting sleeve.

[0040] The distribution plate 115 is rotatably installed in the installation sleeve, and the installation structure of the distribution plate 115 is as follows: the installation plate 114 is provided with a mounting edge 118, and the distribution plate 115 is provided with a driving edge 119. The mounting edge 118 is fixed to the end of the damper body 101. The mounting edge 118 can be fixed to the end of the damper body 101 through a flange structure or the mounting edge 118 is fixed to the end of the damper body 101 by welding. The driving edge 119 is pressed against the right end cover 105 and the mounting edge 118. A plurality of arc holes are arranged at intervals along the circumferential direction on the driving edge 119. The right end cover 105 is provided with mounting bolts that pass through the ends of the arc holes and are threadedly connected to the mounting edge 118. By setting the mounting bolts and the arc holes, the maximum rotation angle of the distribution plate 115 can be limited.

[0041] The right end cover 105 and the driving edge 119 are sealed by a labyrinth seal ring 120. The provision of the labyrinth seal ring 120 can ensure the sealing performance between the right end cover 105 and the driving edge 119, and prevent the magnetic fluid in the right chamber 111 from leaking.

[0042] A plurality of distribution ports 121 are provided on the distribution plate 115 at intervals along the circumferential direction. The distribution plate 115 can be rotated to connect the distribution ports 121 with the distribution channel 117, to make the distribution ports 121 different from the distribution channel 117, or to adjust the opening of the connection between the distribution ports 121 and the distribution channel 117. A driving part 122 is provided outside the damper body 101, and the driving part 122 is used to drive the distribution plate 115 to rotate to adjust the opening of the connection between the distribution ports 121 and the distribution channel 117.

[0043] In one embodiment, the driving part 122 includes a driving handle, which is disposed on the distribution plate 115 and extends outside the damper body 101. The distribution plate 115 can be rotated by the driving handle to adjust the rotation angle of the distribution plate 115, thereby adjusting the opening of the communication diameter between the distribution port 121 and the distribution channel 117.

[0044] In another embodiment, the driving unit 122 includes a driving motor, which is fixed on the damper body 101. A driving gear is installed on the output shaft of the driving motor. A linkage gear meshing with the driving gear is mounted on the outer circumference of the distribution plate 115. The driving motor adopts a servo motor. The driving motor can drive the distribution plate 115 to rotate, adjust the rotation angle of the distribution plate 115, and further adjust the opening of the connecting aperture between the distribution port 121 and the distribution channel 117.

[0045] An installation interlayer is provided inside the damper body 101 , and the magnetic induction coil 113 is arranged in the installation interlayer. The magnetic induction coil 113 is electrically connected to the control module.

[0046] The following is a detailed description of the intelligent algorithm module's calculation of the current axial force and the current balancing force.

[0047] The intelligent algorithm module calculates the current axial force based on the current operating parameters of the water pump. The calculation formula for the current axial force is as follows: Where F1 is the current axial force, is the equivalent pressure of the front and rear covers of the impeller, A is the cross-sectional area of ​​the outlet disc of the impeller, Q is the flow rate of the pump, η is the hydraulic efficiency of the pump, s is the cross-sectional area of ​​the inlet of the pump, C1 and C2 are correction parameters; The calculation formula of the impeller outlet disc cross-sectional area is as follows: A=0.25*3.14*D 2 ; Where D is the outlet disc diameter of the impeller.

[0048] The intelligent algorithm module calculates the current balancing force required by the magnetic fluid damper 1 based on the current axial force, and calculates the control current required by the magnetic fluid damper 1 according to the current balancing force; The current balance force calculation formula is as follows: F′=αF1; In the formula, F′ is the current balance force, F1 is the current axial force, α is the proportional parameter, and the value of α is 1.2~1.3; The magnetic fluid damper 1 generates the current balance force through the synchronous action of the main damping force and the auxiliary damping force, F′=F2+F3=αF1, where F2 is the main damping force and F3 is the auxiliary damping force; F2=sgnγ(a0+ a1I+a2I 2 +a3I 3 ); F3=C3F2 / λ; Wherein, sgnγ is the sign function of the viscosity of the magnetic fluid in the magnetic fluid damper 1, a0, a1, a2, a3 are fitting coefficients, C3 is the correction coefficient, and λ is the opening of the connecting caliber formed by the distribution plate 115 in the magnetic fluid damper 1; The calculation formula between the viscosity of the magnetic fluid and the control current in the magnetic fluid damper 1 is as follows: γ=γ0+KH n ; H = nI; Wherein, γ0 is the initial magnetic fluid viscosity of the magnetic fluid damper 1 , K is the correction coefficient, H is the magnetic field strength of the magnetic induction coil 113 in the magnetic fluid damper 1 , and n is the number of turns of the magnetic induction coil 113 .

[0049] Wherein, the control module inputs the control current into the magnetic fluid damper 1 to control the magnetic fluid damper 1 to generate a current balancing force with a dynamic response time lag, and the control module inputs the control current within the dynamic response time lag; The calculation formula of dynamic response time lag is as follows: τ=(L M C M +L R C M +L M C L +LC L ) / R M R L ; Where, L M and R M are the equivalent inductance and resistance of the magnetic fluid damper 1, L and R L is the circuit inductance and resistance of the control module, C M and C L is the equivalent resistance of the capacitor element.

[0050] About magnetic fluid damper 1.

[0051] The magnetic fluid damper 1 is divided into a left chamber 110 and a right chamber 111. The left chamber 110 and the right chamber 111 are filled with magnetic fluid, which is also called magnetic liquid. It has both the fluidity of liquid and the magnetism of solid magnetic material. When a control current is input into the magnetic induction coil 113 of the magnetic fluid damper 1, the magnetic field formed by the magnetic induction coil 113 can change the viscosity of the magnetic fluid. By changing the viscosity of the magnetic fluid, the left and right pushing forces in the piston disk 109 are different, thereby realizing the control of the main damping force.

[0052] The secondary damping force is applied to the main damping force to form the current balancing force. The size of the secondary damping force can be changed by changing the opening of the connecting hole formed by the distribution plate 115, so that the range of the current balancing force can be adjusted.

[0053] Specifically, when the connecting aperture in the distribution plate 115 is the largest, the flow of the magnetic fluid between the left chamber 110 and the right chamber 111 is not restricted, and there is no secondary damping force at this time, and the main damping force is the current balancing force. When the connecting aperture in the distribution plate 115 becomes smaller, the flow of the magnetic fluid between the left chamber 110 and the right chamber 111 becomes smaller and restricted, and the flow of the magnetic fluid becomes more difficult, thereby generating the above-mentioned secondary damping force. At this time, the current balancing force is formed by the main damping force and the secondary damping force.

[0054] Therefore, the connecting diameter in the distribution plate 115 does not change in real time, but is adjusted according to the current axial force generated under different operating conditions of the water pump. After the distribution plate 115 is adjusted, after the current balancing force can balance the current axial force of the water pump, the connecting diameter of the distribution plate 115 will no longer be adjusted.

[0055] When the control current of the magnetic induction coil 113 reaches the upper limit threshold and the current balancing force is unable to balance the current axial force of the water pump, you can choose to reduce the opening of the connecting port of the distribution plate 115, so as to increase the size of the secondary damping force, and then increase the current balancing force, so that the current balancing force is within the range of the current axial force to balance the current axial force of the water pump.

[0056] Therefore, the present application obtains the current operating parameters of the water pump in real time through the operating parameter sensing module, and the intelligent algorithm module calculates the current axial force of the water pump in real time, and then generates the current balancing force through the magnetofluid damper 1 according to the current axial force to balance the axial force of the water pump, thereby realizing real-time axial force monitoring and quantitative balance adjustment, with high control efficiency and good intelligence.

[0057] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A magnetic fluid axial force intelligent balancing system, characterized in that: It comprises a control module and a magnetic fluid damper (1), wherein the control module is provided with an operating parameter sensing module, an intelligent algorithm module and a control module, and the magnetic fluid damper (1) is provided on the main shaft of the water pump; The operating parameter sensing module is used to obtain the current operating parameters of the water pump in real time; The intelligent algorithm module calculates the current axial force based on the current operating parameters of the water pump, calculates the current balancing force required by the magnetic fluid damper (1) based on the current axial force, and calculates the control current required by the magnetic fluid damper (1) based on the current balancing force; The control module controls the magnetic fluid damper (1) based on the control current.

2. A magnetic fluid axial force intelligent balancing system according to claim 1, characterized in that: The intelligent algorithm module calculates the current axial force based on the current operating parameters of the water pump. The calculation formula of the current axial force is as follows: Where F1 is the current axial force, is the equivalent pressure of the front and rear covers of the impeller, A is the cross-sectional area of ​​the outlet disc of the impeller, Q is the flow rate of the pump, η is the hydraulic efficiency of the pump, s is the cross-sectional area of ​​the inlet of the pump, C1 and C2 are correction parameters; The calculation formula of the impeller outlet disc cross-sectional area is as follows: A=0.25*3.14*D 2 ; Where D is the outlet disc diameter of the impeller.

3. A magnetic fluid axial force intelligent balancing system according to claim 2, characterized in that: The intelligent algorithm module calculates the current balancing force required by the magnetic fluid damper (1) based on the current axial force, and calculates the control current required by the magnetic fluid damper (1) according to the current balancing force; The current balance force calculation formula is as follows: F′= α F1; In the formula, F′ is the current balance force, F1 is the current axial force, α is the proportional parameter, and the value of α is 1.2~1.3; The magnetic fluid damper (1) generates a current balancing force through the synchronous action of a main damping force and a secondary damping force. F′=F2+F3=αF1, where F2 is the main damping force and F3 is the secondary damping force; <h2 style=";text-align:left;direction:ltr">F2 = sgnγ(a0+a1I+a2I<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> +a3I<h2 style=";text-align:left;direction:ltr"> 3 <h2 style=";text-align:left;direction:ltr"> ); F3=C3F2 / λ; In the formula, sgnγ is the sign function of the viscosity of the magnetic fluid in the magnetic fluid damper (1), a0, a1, a2, a3 are fitting coefficients, C3 is a correction coefficient, and λ is the opening of the connecting aperture formed by the distribution plate (115) in the magnetic fluid damper (1); The calculation formula between the viscosity of the magnetic fluid and the control current in the magnetic fluid damper (1) is as follows: γ=γ0+KH n ; H = nI; In the formula, γ0 is the initial magnetic fluid viscosity of the magnetic fluid damper (1), K is the correction coefficient, H is the magnetic field intensity of the magnetic induction coil (113) in the magnetic fluid damper (1), and n is the number of turns of the magnetic induction coil (113).

4. The magnetic fluid axial force intelligent balancing system according to claim 3 is characterized in that: The control module inputs a control current into the magnetic fluid damper (1) to control the magnetic fluid damper (1) to generate a current balancing force with a dynamic response time lag, and the control module inputs the control current within the dynamic response time lag; The calculation formula of dynamic response time lag is as follows: τ=(L M C M +L R C M +L M C L +LC L ) / R M R L ; Where, L M and R M are the equivalent inductance and resistance of the MFD damper (1), L and R L is the circuit inductance and resistance of the control module, C M and C L is the equivalent resistance of the capacitor element.

5. The magnetic fluid axial force intelligent balancing system according to claim 3 is characterized in that: The magnetic fluid damper (1) comprises a damper body (101), a damping chamber (102) is arranged in the damper body (101), a connecting shaft (103) is passed through the damper body (101), and the connecting shaft (103) is coaxially connected to a main shaft of a water pump; The connecting shaft (103) is provided with a connecting sleeve (108), the connecting sleeve (108) is provided with a piston disc (109) in contact with the inner wall of the damping chamber (102), the piston disc (109) divides the damping chamber (102) into a left chamber (110) and a right chamber (111), the left chamber (110) and the right chamber (111) are filled with magnetic fluid, and the piston disc (109) is provided with a plurality of flow openings (112) arranged at intervals along the circumferential direction; The damping chamber (102) is provided with a flow distribution component for adjusting the flow rate of the flow opening (112) on the piston disc (109); The damper body (101) is coated with a magnetic induction coil (113), and the control module is used to input a control current into the magnetic induction coil (113) to generate a main damping force through the magnetic fluid, and to adjust the flow rate of the flow port (112) through the flow distribution component to generate a secondary damping force, and to generate a current balancing force through the synchronous action of the main damping force and the secondary damping force.

6. The magnetic fluid axial force intelligent balancing system according to claim 5, characterized in that: The flow distribution assembly comprises a mounting plate (114) and a flow distribution plate (115), wherein the mounting plate (114) is fixed in the damper body (101), the mounting plate (114) is sleeved on the outside of the connecting shaft sleeve (108), a flow cavity (116) is formed between the end surface of the mounting plate (114) and the piston plate (109), a plurality of flow distribution channels (117) are spaced apart in the circumferential direction in the mounting sleeve, one end of the flow distribution channel (117) is communicated with the flow cavity (116), and the other end of the flow distribution channel (117) is communicated with the inner wall surface of the mounting sleeve; The distribution plate (115) is rotatably mounted in the mounting sleeve, and a plurality of distribution ports (121) are arranged on the distribution plate (115) at intervals along a circumferential direction. A driving portion (122) is arranged outside the damper body (101), and the driving portion (122) is used to drive the distribution plate (115) to rotate so as to adjust the opening of the communication aperture between the distribution ports (121) and the distribution channel (117).

7. The magnetic fluid axial force intelligent balancing system according to claim 6, characterized in that: The driving portion (122) comprises a driving handle, which is arranged on the distribution plate (115) and extends outside the damper body (101); or The driving part (122) comprises a driving motor, which is fixedly arranged on the damper body (101). A driving gear is mounted on the output shaft of the driving motor, and a linkage gear meshing with the driving gear is sleeved on the outer circumference of the distribution plate (115).

8. The magnetic fluid axial force intelligent balancing system according to claim 6, characterized in that: A left end cover (104) and a right end cover (105) are installed at both ends of the damper. The left end cover (104) and the right end cover (105) seal the damping chamber (102). The left end cover (104) and the right end cover (105) are provided with a connecting port for the connecting shaft (103) to pass through. A rotating bearing (106) matched with the connecting shaft (103) is provided in the connecting port. The left end cover (104) and the right end cover (105) are provided with a sealing cover (107) which is sleeved on the connecting shaft (103) and seals the connecting port.

9. The magnetic fluid axial force intelligent balancing system according to claim 8, characterized in that: The mounting plate (114) is provided with a mounting edge (118), and the distribution plate (115) is provided with a driving edge (119). The mounting edge (118) is fixed to the end of the damper body (101), and the driving edge (119) is pressed against the right end cover (105) and the mounting edge (118). A plurality of arc holes are arranged at intervals along the circumferential direction on the driving edge (119), and the right end cover (105) is provided with mounting bolts that pass through the ends of the arc holes and are threadedly connected to the mounting edge (118). The right end cover (105) and the driving edge (119) are sealed by a labyrinth sealing ring (120).

10. The magnetic fluid axial force intelligent balancing system according to claim 5, characterized in that: A mounting interlayer is provided inside the damper body (101), and the magnetic induction coil (113) is arranged in the mounting interlayer.

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