Magnetic fluid dual-window occupancy switching energy recovery damping device and operation method thereof

Abstract

This invention discloses a magnetofluidic dual-window occupancy switching energy recovery damping device and its operation method, comprising a main housing, a left isolation diaphragm, a right compensation diaphragm, a compensation return mechanism, and a coil module. The main housing has a left window working cavity, a right window working cavity, and a narrow neck located between them. The left isolation diaphragm is installed in the left window working cavity, and the right compensation diaphragm is installed in the right window working cavity. The compensation return mechanism is located within the compensation cavity. This invention achieves electrical energy output and damping vibration reduction by redistributing magnetofluid between the left and right working cavities to induce magnetic flux changes. It solves the problems of existing technologies where rigid magnets experience significant friction, wear, and impact during long-term operation, have high coaxiality requirements, limited damping adjustment range, and difficulty in balancing structural compactness and operational stability.

Description

Technical Field

[0001] This invention relates to the field of vibration control and energy recovery technology for hydraulic systems of hydro-generator sets, and in particular to a magnetofluid dual-window occupancy switching energy recovery damping device and its operation method. Background Technology

[0002] In the hydraulic system of a hydro-generator unit, pipeline vibration typically originates from factors such as oil inertia, pressure fluctuations caused by valve opening and closing, and sudden changes in local flow. These pulsations and vibrations lead to increased pipeline noise, accelerated component fatigue, shortened seal life, and affect the overall stability of the hydraulic system. Existing hydraulic vibration reduction structures mainly employ methods such as throttling, energy storage, rubber vibration isolation, and mechanical damping. Their primary function is to reduce vibration energy, but most can only dissipate pulsating energy, making it difficult to simultaneously address energy recovery and adjustable damping.

[0003] Among existing methods for converting vibrational energy into electrical energy, a common approach is to utilize a rigid permanent magnet that reciprocates with a piston or push rod, generating electricity by cutting the magnetic field lines of a coil. While this method can achieve a certain level of power generation, it typically suffers from the following drawbacks: First, the rigid magnet requires a clearly defined guiding and limiting structure, resulting in numerous structural components and significant friction, wear, and impact during long-term operation. Second, the coaxiality requirement between the moving magnetic source and the coil is high; insufficient guiding precision can easily lead to unstable motion or localized jamming. Third, traditional structures often rely on a single mover for linear displacement, limiting the damping adjustment range and making it difficult to balance structural compactness with operational stability.

[0004] Therefore, this application proposes a magnetohydrodynamic dual-window occupancy switching energy recovery damping device and its operation method. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a magnetohydrodynamic dual-window occupancy switching energy recovery damping device and its operation method, so as to solve the problems of obvious friction, wear and impact, high coaxiality requirements, limited damping adjustment range, and difficulty in balancing structural compactness and stable operation of rigid magnets during long-term operation in the prior art.

[0006] To achieve the above objectives, this application provides a magnetohydrodynamic dual-window occupancy switching energy recovery damping device, comprising:

[0007] The main housing has a left window working cavity, a right window working cavity, and a narrow neck located between the two. The left isolation diaphragm, located inside the left window working cavity, divides the left window working cavity into the left working cavity and the hydraulic input cavity; The right compensation diaphragm is located inside the right window working cavity, dividing the right window working cavity into the right working cavity and the compensation cavity; The compensation return mechanism is located inside the compensation cavity and abuts against the right compensation diaphragm. It is used to compensate for changes in the volume of the right working cavity and to provide the return force of the right compensation diaphragm. The main housing is provided with an interface that connects to the hydraulic input chamber; coil modules are respectively provided on the main housing at the positions corresponding to the left working chamber and the right working chamber, and the left working chamber and the right working chamber are filled with magnetorheological fluid; When the pulsating pressure in the hydraulic system is transmitted to the hydraulic input chamber through the interface, the pulsating pressure is transmitted to the right working chamber through the left isolation diaphragm. The flow resistance is provided by the narrow neck in the middle. When the occupancy state of the magnetofluid in the left and right working chambers changes, the magnetic flux in the coil module changes, thereby outputting electrical energy.

[0008] The main housing includes a main body, with cavities at both ends of the main body, and a conical structure on each side of the two cavities, with the middle of the two conical structures forming the narrow neck. The main body is equipped with a left hydraulic end cap and a right compensation end cap at its two ends respectively. The left isolation diaphragm is fixedly installed between the left hydraulic end cap and the main body, and the right compensation diaphragm is fixedly installed between the right compensation end cap and the main body. The hydraulic input chamber is located inside the left hydraulic end cover, and the interface is located on the left hydraulic end cover. The compensation cavity is located inside the right compensation end cap.

[0009] A replaceable throttling core is installed at the narrow neck in the middle. The throttling core has a main through hole at its center and an axial flow channel groove on its outer peripheral wall, which is used to adjust the flow resistance characteristics of the magnetohydrodynamic fluid when switching between the left and right working chambers.

[0010] The inner walls of the left and right working cavities are also equipped with shaping bushings with several longitudinal slots, which are used to constrain and rectify the distribution of the magnetofluid in the window working cavity.

[0011] The coil module includes an induction coil, which is fitted outside the main housing. When the occupancy state of the magnetofluid in the left and right working cavities changes, electrical energy is output through the induction coils on both sides.

[0012] The coil module also includes an excitation coil, which is fitted outside the main housing and located on the side of the induction coil near the middle narrow neck. By applying current to the excitation coil, the migration resistance of the magnetohydrodynamic fluid in the left and right working chambers and near the middle narrow neck is increased, thereby improving the equivalent damping.

[0013] The coil module also includes an insulating ring, which is fitted and fixed to the outside of the main housing. The outer circumference of the insulating ring is provided with two annular grooves. The induction coil is installed in the outer annular groove and the excitation coil is installed in the inner annular groove. A magnetic sleeve is fitted and fixed on the insulating ring to form a fixed magnetic circuit.

[0014] The outer circumferential wall of the magnetic sleeve is provided with outwardly radially extending magnetic flux constraint rings at both ends to improve the concentration of the magnetic circuit and enhance the magnetic response of the working cavity.

[0015] The compensation return mechanism includes a compensation spring and a pressure plate. One end of the compensation spring abuts against the compensation cavity, and the other end abuts against one side of the pressure plate. The other side of the pressure plate abuts against the right compensation diaphragm.

[0016] An operating method for the magnetohydrodynamic dual-window occupancy switching energy recovery damping device includes the following steps: During operation, the hydraulic system is connected to the main housing via an interface; In the initial equilibrium state, the magnetohydrodynamic occupancy in the left and right working cavities is close to equilibrium, and the induction coils in the left and right coil modules have no power output. When the pulsating pressure in the hydraulic system enters the hydraulic input chamber through the interface, it pushes the left isolation diaphragm to deform and shift to the right, thereby driving the magnetofluid inside the left working chamber to migrate from the left working chamber through the middle narrow neck to the right working chamber. The local permeability and magnetic flux distribution in the left and right working chambers change synchronously, thereby causing the induction coil to generate an induced voltage output. When the pulsation weakens, the compensation return mechanism pushes the right compensation diaphragm and the internal magnetic fluid back to their original positions. The magnetic fluid then migrates back to the left, causing the induction coil to generate an induced voltage output, and the device returns to a near-equilibrium state. By applying different currents to the excitation coils on both sides, the equivalent migration resistance of the magnetofluid as it passes through the working chamber and the narrow neck in the middle is changed, thereby achieving active adjustment of the damping characteristics.

[0017] Compared with the prior art, the above-conceptual technical solution conceived in this application has the following beneficial effects: 1. This invention does not employ the reciprocating motion of a rigid permanent magnet. Instead, it achieves electrical energy output and damping vibration reduction by redistributing magnetic flux between the left and right working chambers through a magnetofluid. This solves the problems of existing technologies where rigid magnets experience significant friction, wear, and impact during long-term operation, have high coaxiality requirements, limited damping adjustment range, and struggle to balance structural compactness and operational stability.

[0018] 2. This invention integrates hydraulic pulse input, magnetohydrodynamic reconstruction, fixed magnetic circuit power generation, and excitation damping into a single structural unit, no longer limited to simple vibration reduction or simple energy harvesting, thereby improving the overall utilization efficiency of the hydraulic system.

[0019] 3. By setting a replaceable throttling core, the present invention can change the switching resistance and flow characteristics of the left and right windows, enabling the device to adapt to different hydraulic pulsation conditions.

[0020] 4. By installing shaping bushings in the left and right working cavities, this invention can constrain the distribution boundary of the magnetofluid within the window cavity, thereby enhancing the stability and repeatability of magnetic permeability changes within the working cavity.

[0021] 5. By energizing the left and right excitation coils, this invention can change the migration resistance of the magnetofluid in the working chamber and narrow neck region, thereby achieving active adjustment of the damping strength.

[0022] 6. The present invention uses a right compensation diaphragm and a compensation spring to form an independent return module, which enables the magnetofluid to reliably return to the equilibrium state after pulsation release.

[0023] 7. The present invention has a compact structure and a high degree of modularity. The main housing, end cap, diaphragm, throttling core, shaping bushing and left and right coil modules are integrated in the same assembly, which facilitates installation, maintenance and parameter replacement. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention.

[0027] Figure 3 This is a cross-sectional structural diagram of the main body of the present invention.

[0028] Figure label: Main housing 10, main body 11, left hydraulic end cover 12, interface 13, right compensation end cover 14, left working chamber 15, right working chamber 16, middle narrow neck 17, hydraulic input chamber 18, compensation chamber 19. Left isolation diaphragm 20; Right compensation diaphragm 30; Compensation return mechanism 40, compensation spring 41, pressure plate 42; Shaping bushing 50, longitudinal slot 51; Coil module 60, induction coil 61, excitation coil 62, magnetic sleeve 63, insulating ring 64, ring groove 65, magnetic flux constraint ring 66; Throttling core 70, flow channel groove 71; Terminal block 80. Detailed Implementation

[0029] To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be specifically noted that the specific embodiments described below are only for illustrating the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0030] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they 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, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection via an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Among existing methods for converting vibrational energy into electrical energy, a common approach is to utilize a rigid permanent magnet that reciprocates with a piston or push rod, generating electricity by cutting the magnetic field lines of a coil. While this method can achieve a certain level of power generation, it typically suffers from the following drawbacks: First, the rigid magnet requires a clearly defined guiding and limiting structure, resulting in numerous structural components and significant friction, wear, and impact during long-term operation. Second, the coaxiality requirement between the moving magnetic source and the coil is high; insufficient guiding precision can easily lead to unstable motion or localized jamming. Third, traditional structures often rely on a single mover for linear displacement, limiting the damping adjustment range and making it difficult to balance structural compactness with operational stability.

[0033] Magnetofluid is a fluid medium that exhibits a distinct magnetic response under the influence of an external magnetic field, possessing both fluidity and adjustable magnetic properties. By introducing hydraulic pulsations into a working system isolated from hydraulic oil, and redistributing the magnetofluid within a specific window region, changes in the local permeability and flux distribution in the fixed magnetic circuit can induce variations in the magnetic flux linkage of the induction coil, thereby generating electricity. Simultaneously, by adjusting the excitation coil current, the migration resistance of the magnetofluid can be altered, achieving active adjustment of its damping characteristics.

[0034] Example 1: See Figure 1-3 The present invention provides a magnetohydrodynamic dual-window occupancy switching energy recovery damping device, including a main housing 10, a left isolation diaphragm 20, a right compensation diaphragm 30, a compensation return mechanism 40, and a coil module 60.

[0035] See Figure 2 The main housing 10 is a housing capable of withstanding the pressure of the hydraulic system. The main housing 10 has a left window working chamber, a right window working chamber, and a narrow neck 17 located between them. A left isolation diaphragm 20 is installed in the left window working chamber, dividing it into a left working chamber 15 and a hydraulic input chamber 18. A right compensation diaphragm 30 is installed in the right window working chamber, dividing it into a right working chamber 16 and a compensation chamber 19. A compensation return mechanism 40 is located in the compensation chamber 19, with one end abutting against the right compensation diaphragm 30 and the other end abutting against the compensation chamber 19. The compensation return mechanism 40 is used to compensate for volume changes in the right working chamber 16 and provide a return force to the right compensation diaphragm 30.

[0036] The main housing 10 is provided with an interface 13 that connects to the hydraulic input chamber 18. In use, the interface 13 is connected to the hydraulic system. Coil modules 60 are installed on the main housing 10 at positions corresponding to the left working chamber 15 and the right working chamber 16, respectively. Both the left working chamber 15 and the right working chamber 16 are filled with magnetorheological fluid.

[0037] When the pulsating pressure in the hydraulic system is transmitted to the hydraulic input chamber 18 through the interface 13, the pulsating pressure is transmitted to the right working chamber 16 through the left isolation diaphragm 20, and the flow resistance is provided through the middle narrow neck 17. When the occupancy state of the magnetofluid in the left working chamber 15 and the right working chamber 16 changes, the magnetic flux in the coil module 60 changes, thereby outputting electrical energy.

[0038] Compared with existing technologies, the core innovation of this invention lies in abandoning the structural route of a rigid permanent magnet reciprocating in a single coil. Instead, it constructs a structural system consisting of a hydraulically driven left isolation diaphragm 20, a dual-window magnetofluid working chamber, a right compensation diaphragm 30 for compensation and return, and a fixed dual-window magnetic circuit coil module. The left isolation diaphragm 20 mainly undertakes the functions of hydraulic pulse input and medium isolation, while the right compensation diaphragm 30 mainly undertakes the functions of internal volume change compensation and return force transmission. The hydraulic pulse first pushes the left isolation diaphragm 20, and then drives the magnetofluid to redistribute between the left and right working chambers. A coil module 60 is installed on the outside of the left and right working chambers. When the occupancy ratio of the magnetofluid in the left and right working chambers changes, the local permeability and magnetic flux distribution in the left and right working chambers change synchronously, thereby causing the fixed induction coil to generate an induced voltage.

[0039] See Figure 2The main housing 10 includes a body 11, with cavities at both ends. One side of each cavity has a conical structure, and the middle of each conical structure forms a narrow neck 17. A left hydraulic end cap 12 and a right compensation end cap 14 are bolted and sealed to both ends of the body 11. A left isolation diaphragm 20 is fixedly and sealed between the left hydraulic end cap 12 and the body 11, and a right compensation diaphragm 30 is fixedly and sealed between the right compensation end cap 14 and the body 11. A hydraulic input chamber 18 is located inside the left hydraulic end cap 12, and an interface 13 is located on the left hydraulic end cap 12, communicating with the hydraulic input chamber 18. A compensation chamber 19 is located inside the right compensation end cap 14. This structure facilitates manufacturing. The left isolation diaphragm 20 and the right compensation diaphragm 30 are made of rubber.

[0040] In this embodiment, the compensation return mechanism 40 includes a compensation spring 41 and a pressure plate 42. One end of the compensation spring 41 abuts against the compensation cavity 19, and the other end abuts against one side of the pressure plate 42. The other side of the pressure plate 42 abuts against the right compensation diaphragm 30. After the pulsation weakens, the compensation spring 41 applies a leftward return force to the right compensation diaphragm 30 through the pressure plate 42, pushing the right compensation diaphragm 30 and its internal magnetic fluid back to their original positions, causing the magnetic fluid to migrate and flow back to the left, thereby generating an induced voltage output from the induction coil 61.

[0041] An adjustment pad can also be installed inside the compensation cavity 19 at the right end of the compensation spring 41 to change the initial installation length of the compensation spring.

[0042] During operation, the pulsating pressure in the hydraulic system enters the hydraulic input chamber 18 inside the left hydraulic end cover 12 through interface 13, pushing the left isolation diaphragm 20 to deform and shift to the right, thereby driving the internal magnetofluid to migrate from the left working chamber 15 to the right working chamber 16. After the occupancy state of the magnetofluid in the left working chamber 15 and the right working chamber 16 changes, the magnetic flux distribution of the coil module 60 outside the left working chamber 15 and the right working chamber 16 changes, realizing energy recovery; after the pulsation weakens, the compensation spring 41 pushes the right compensation diaphragm 30 back to its original position, allowing the magnetofluid to flow back to the equilibrium state.

[0043] See Figure 2 , 3 The coil module 60 includes an induction coil 61, which is mounted on the outside of the main housing 10. When the occupancy state of the magnetofluid in the left and right working cavities changes, electrical energy is output through the induction coils 61 on both sides.

[0044] To improve system integration and control scalability, see [link / reference]. Figure 1Terminals 80 are installed on the outer wall of the main body 11 at the positions corresponding to the coil modules 60, for leading out the electrical connection between the induction coil 61 and the excitation coil 62. Sensor mounting bases can also be provided at corresponding positions in the left working chamber 15 and the right working chamber 16, which can be used to install position sensors, magnetic induction sensors or state triggering elements, thereby providing an interface for the zoned control of the excitation coil or subsequent closed-loop control.

[0045] Example 2: Based on Embodiment 1, the coil module 60 further includes an excitation coil 62, which is fitted outside the main housing 10 and located on the side of the induction coil 61 near the middle narrow neck 17. In use, by applying different currents to the left and right excitation coils 62, the equivalent migration resistance of the magnetofluid as it passes through the left and right working chambers and the middle narrow neck 17 can be changed, thereby increasing the migration resistance of the magnetofluid in the left and right working chambers and near the middle narrow neck 17, thus achieving active adjustment of the damping characteristics.

[0046] Example 3: Based on Embodiment 2, the coil module 60 further includes an insulating ring 64, which is fitted and fixed to the outside of the main housing 10. Two annular grooves 65 are provided on the outer circumference of the insulating ring 64. The induction coil 61 is installed in the outer annular groove 65, and the excitation coil 62 is installed in the inner annular groove 65. A magnetic sleeve 63 is fitted and fixed onto the insulating ring 64 to form a fixed magnetic circuit. By installing the magnetic sleeve 63, the magnetic field is concentrated, thereby enhancing power generation and excitation.

[0047] Furthermore, magnetic flux constraint rings 66 extending radially outward are respectively provided at both ends of the outer circumferential wall of the magnetic sleeve 63 to improve the concentration of the magnetic circuit and enhance the magnetic response of the working cavity.

[0048] Example 4: Based on Example 1, 2, or 3, see [link to example]. Figure 2 , 3 A replaceable throttling core 70 is installed at the narrow neck 17 in the middle. The throttling core 70 has a main through hole in the center and several axial flow channel grooves 71 on the outer peripheral wall, which are used to adjust the flow resistance characteristics of the magnetofluid when switching between the left and right working chambers.

[0049] Specifically, when the magnetofluid flows through the narrow neck 17, the flow resistance is determined by the diameter of the narrow neck 17, resulting in a single flow resistance. Furthermore, if the magnetofluid flows too quickly, the switching between the left and right working chambers 15 and 16 becomes unstable. By installing a throttling core 70, the circumferential flow channel 71 forms an auxiliary channel for the magnetofluid, restricting its path and resulting in more uniform flow. Additionally, by changing the diameter of the main through-hole of the throttling core 70 and / or the width and depth of the flow channel 71, the velocity, resistance, and response of the magnetofluid will change accordingly, thereby refining the flow resistance characteristics.

[0050] Example 5: Based on embodiment 1, 2, 3 or 4, the inner walls of the left working cavity 15 and the right working cavity 16 are respectively equipped with shaping bushings 50 with several longitudinal slots 51, which are used to constrain and rectify the distribution pattern of the magnetofluid in the window working cavity.

[0051] Specifically, after setting several longitudinal slots 51 in the shaping bushing 50, the magnetic fluid will be dispersed to each longitudinal slot 51, increasing the contact area and improving the magnetic flux distribution.

[0052] Example 6: This application also discloses an operation method for the magnetohydrodynamic dual-window occupancy switching energy recovery damping device described in Embodiments 2, 3, 4, or 5, comprising the following steps: During operation, the hydraulic system is connected to the main housing 10 via interface 13.

[0053] In the initial equilibrium state, the magnetofluid occupancy in the left working chamber 15 and the right working chamber 16 is close to equilibrium, and the induction coil 61 in the two coil modules 60 has no power output, or has a weak power output under slight pressure pulsation.

[0054] When the pulsating pressure in the hydraulic system enters the hydraulic input chamber 18 through the interface 13, it pushes the left isolation diaphragm 20 to deform and shift to the right, thereby driving the magnetofluid inside the left working chamber 15 to migrate from the left working chamber 15 through the middle narrow neck 17 to the right working chamber 16. The local permeability and magnetic flux distribution in the left working chamber 15 and the right working chamber 16 change synchronously, thereby causing the induction coil 61 to generate an induced voltage output.

[0055] When the pulsation weakens, the compensation return mechanism 40 pushes the right compensation diaphragm 30 and the internal magnetic fluid back to their original positions. The magnetic fluid then migrates back to the left, causing the induction coil 61 to generate an induced voltage output, and the device returns to a near-equilibrium state.

[0056] By applying different currents to the excitation coils 62 on both sides, the equivalent migration resistance of the magnetofluid as it passes through the working chamber and the narrow neck 17 in the middle is changed, thereby achieving active adjustment of the damping characteristics.

[0057] Specifically, the device can be divided into three typical working conditions: initial equilibrium state, left-driven right-migrating state, and spring return state.

[0058] In the initial equilibrium state, the magnetofluid occupancy in the left working cavity 15 and the right working cavity 16 is close to equilibrium, and the output of the left and right induction coils 61 is relatively weak.

[0059] When the hydraulic system pulsation increases, the left isolation diaphragm 20 shifts to the right, and the magnetofluid migrates to the right working chamber 16 through the throttling core 70. At this time, the magnetic flux of the induction coil 61 at the right working chamber 16 increases, and the magnetic flux of the induction coil 61 at the left working chamber 15 decreases, resulting in a differential output.

[0060] When the pulsation weakens, the compensation spring 41 pushes the right compensation diaphragm 30 and the internal magnetic fluid back to their original positions, and the magnetic fluid flows back to the left, and the device returns to a near-equilibrium state.

[0061] Under normal operating conditions, the induction coils 61 on both sides can directly realize the recovery of hydraulic pulsation energy. When the vibration is strong or needs to be strengthened, current can be applied to the excitation coils 62 on both sides to increase the migration resistance of the magnetofluid in the window area and near the throttling core, thereby improving the equivalent damping of the system.

[0062] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0063] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A magnetohydrodynamic dual-window occupancy switching energy recovery damping device, characterized in that, include: The main housing (10) has a left window working cavity, a right window working cavity and a narrow neck (17) located between the two. The left isolation diaphragm (20) is located in the working cavity of the left window, dividing the working cavity of the left window into the left working cavity (15) and the hydraulic input cavity (18). The right compensation diaphragm (30) is located in the right window working cavity, dividing the right window working cavity into the right working cavity (16) and the compensation cavity (19). The compensation return mechanism (40) is located in the compensation cavity (19) and abuts against the right compensation diaphragm (30). It is used to compensate for the volume change of the right working cavity (16) and provide the return force of the right compensation diaphragm (30). The main housing (10) is provided with an interface (13) that connects to the hydraulic input chamber (18); coil modules (60) are respectively provided on the main housing (10) at the positions corresponding to the left working chamber (15) and the right working chamber (16), and the left working chamber (15) and the right working chamber (16) are filled with magnetic fluid; When the pulsating pressure in the hydraulic system is transmitted to the hydraulic input chamber (18) through the interface (13), the pulsating pressure is transmitted to the right working chamber (16) through the left isolation diaphragm (20), and the flow resistance is provided through the middle narrow neck (17). When the occupancy state of the magnetofluid in the left working chamber (15) and the right working chamber (16) changes, the magnetic flux in the coil module (60) changes, thereby outputting electrical energy.

2. The magnetohydrodynamic dual-window occupancy switching energy recovery damping device according to claim 1, characterized in that, The main housing (10) includes a main body (11), with cavities at both ends of the main body (11), and conical structures on opposite sides of the two cavities, with the middle narrow neck (17) formed through the middle of the two conical structures. The main body (11) is equipped with a left hydraulic end cap (12) and a right compensation end cap (14) at its two ends respectively. The left isolation diaphragm (20) is fixedly installed between the left hydraulic end cap (12) and the main body (11), and the right compensation diaphragm (30) is fixedly installed between the right compensation end cap (14) and the main body (11). The hydraulic input chamber (18) is located inside the left hydraulic end cap (12), and the interface (13) is located on the left hydraulic end cap (12); The compensation cavity (19) is located inside the right compensation end cap (14).

3. The magnetohydrodynamic dual-window occupancy switching energy recovery damping device according to claim 1, characterized in that, A replaceable throttling core (70) is installed at the middle narrow neck (17). The throttling core (70) has a main through hole at its center and an axial flow channel groove (71) on its outer peripheral wall, which is used to adjust the flow resistance characteristics of the magnetofluid when switching between the left and right working chambers.

4. The magnetohydrodynamic dual-window occupancy switching energy recovery damping device according to claim 1, characterized in that, The inner walls of the left working cavity (15) and the right working cavity (16) are also respectively equipped with shaping bushings (50) with several longitudinal slots (51) to constrain and rectify the distribution pattern of the magnetofluid in the window working cavity.

5. The magnetohydrodynamic dual-window occupancy switching energy recovery damping device according to claim 1, characterized in that, The coil module (60) includes an induction coil (61), which is fitted outside the main housing (10). When the occupancy state of the magnetofluid in the left and right working cavities changes, electrical energy is output through the induction coils (61) on both sides.

6. The magnetohydrodynamic dual-window occupancy switching energy recovery damping device according to claim 5, characterized in that, The coil module (60) also includes an excitation coil (62), which is fitted outside the main housing (10) and located on the side of the induction coil (61) near the middle narrow neck (17). By applying current to the excitation coil (62), the migration resistance of the magnetofluid in the left and right working chambers and near the middle narrow neck (17) is increased to improve the equivalent damping.

7. The magnetohydrodynamic dual-window occupancy switching energy recovery damping device according to claim 6, characterized in that, The coil module (60) also includes an insulating ring (64), which is fixedly fitted on the outside of the main housing (10). The outer circumference of the insulating ring (64) is provided with two annular grooves (65). The induction coil (61) is installed in the outer annular groove (65), and the excitation coil (62) is installed in the inner annular groove (65). A magnetic sleeve (63) is fitted and fixed on the insulating ring (64) to form a fixed magnetic circuit.

8. The magnetohydrodynamic dual-window occupancy switching energy recovery damping device according to claim 7, characterized in that, The outer circumferential wall of the magnetic sleeve (63) is provided with magnetic flux constraint rings (66) extending radially outward at both ends, so as to improve the concentration of the magnetic circuit and enhance the magnetic response of the working cavity.

9. The magnetohydrodynamic dual-window occupancy switching energy recovery damping device according to claim 1, characterized in that, The compensation return mechanism (40) includes a compensation spring (41) and a pressure plate (42). One end of the compensation spring (41) abuts against the compensation cavity (19), and the other end abuts against one side of the pressure plate (42). The other side of the pressure plate (42) abuts against the right compensation diaphragm (30).

10. A method for operating the magnetohydrodynamic dual-window occupancy switching energy recovery damping device as described in claim 7 or 8, characterized in that, Includes the following steps: During operation, the hydraulic system is connected to the main housing (10) via interface (13); In the initial equilibrium state, the magnetofluid occupancy in the left working cavity (15) and the right working cavity (16) is close to equilibrium, and the induction coil (61) in the two coil modules (60) has no power output; When the pulsating pressure in the hydraulic system enters the hydraulic input chamber (18) through the interface (13), it pushes the left isolation diaphragm (20) to deform and shift to the right, thereby driving the magnetic fluid inside the left working chamber (15) to migrate from the left working chamber (15) through the middle narrow neck (17) to the right working chamber (16). The local permeability and magnetic flux distribution in the left working chamber (15) and the right working chamber (16) change synchronously, thereby causing the induction coil (61) to generate an induced voltage output. When the pulsation weakens, the compensation return mechanism (40) pushes the right compensation diaphragm (30) and the internal magnetic fluid back to their original positions. The magnetic fluid then migrates back to the left, causing the induction coil (61) to generate an induced voltage output, and the device returns to a near-equilibrium state. When different currents are applied to the excitation coils (62) on both sides, the equivalent migration resistance of the magnetofluid when passing through the working chamber and the narrow neck (17) in the middle is changed, thereby realizing the active adjustment of the damping characteristics.

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