Floating ball type multi-degree-of-freedom self-energized vibration sensing device based on magnetic liquid suspension characteristic

Abstract

The invention provides a floating ball type multi-degree-of-freedom self-energized vibration sensing device based on a magnetic liquid suspension characteristic, the device comprises a shell assembly and an energy storage assembly, the shell assembly comprises a shell body and an insulating shell, the insulating shell is connected with the shell body and is located in a cavity of the shell body, the insulating shell defines a monitoring chamber, and the monitoring chamber is connected with the energy storage assembly. The electromagnetic induction coil is wound on the shell body, the permanent magnet ball body is arranged in the monitoring cavity, the monitoring cavity is filled with the magnetic liquid so as to be adsorbed on the permanent magnet ball body, the monitoring piece is connected with the insulating shell and used for monitoring magnetic field changes of the monitoring cavity and outputting working voltage, and the energy storage assembly is electrically connected with the electromagnetic induction coil and the insulating shell. And the energy storage assembly is connected with the monitoring part and is used for providing electric energy required by the monitoring part for the monitoring part. The device has the advantages of simple structure, no mechanical wear, high sensitivity, impact resistance, low energy consumption and good low-frequency response.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to a float-type multi-degree-of-freedom self-powered vibration sensor device based on the suspension characteristics of magnetic liquid. Background Art

[0002] Vibration sensors are key components in detection technology and are widely used in energy, chemical engineering, metallurgy, machine manufacturing, scientific research, and teaching. Their primary function is to accurately detect the mechanical vibration of the object being measured and convert it into an electrical signal for output or display.

[0003] Vibration sensors are primarily categorized into three types: mechanical, optical, and electrical. All three types involve vibration pickup, measurement and amplification circuitry, and display and recording. While these three types of sensors are effective in their respective applications, they all suffer from several shortcomings. They all involve vibration pickup, measurement and amplification circuitry, and display and recording, resulting in relatively complex structures. Furthermore, these sensors require additional power to maintain normal operation, which undoubtedly increases energy consumption, costs, and maintenance. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a float-type multi-degree-of-freedom self-powered vibration sensing device based on the suspension characteristics of magnetic liquid, which has the advantages of simple structure, no mechanical wear, high sensitivity, impact resistance, low energy consumption and good low-frequency response.

[0006] The float-type multi-degree-of-freedom self-powered vibration sensing device based on the magnetic liquid suspension characteristics according to an embodiment of the present invention includes:

[0007] a housing assembly comprising a housing body and an insulating housing, wherein the housing body is adapted to be mounted on the vibration device, the insulating housing being connected to the housing body and positioned within a cavity of the housing body, and the insulating housing defining a monitoring chamber;

[0008] An electromagnetic-friction composite vibration energy harvester, comprising a monitoring element, an electromagnetic induction coil, a magnetic fluid, and a permanent magnetic sphere. The electromagnetic induction coil is wound around the housing body and extends along the height direction of the housing body. The permanent magnetic sphere is placed in the monitoring chamber. The magnetic fluid is filled in the monitoring chamber to be adsorbed on the permanent magnetic sphere. The monitoring element is connected to the insulating housing and is used to monitor changes in the magnetic field in the monitoring chamber and output an operating voltage.

[0009] An energy storage component is electrically connected to the electromagnetic induction coil to store the current generated by the electromagnetic induction coil. The energy storage component is connected to the insulating shell. The movement of the permanent magnetic sphere drives the movement of the magnetic liquid, so that current is generated between the magnetic liquid and the insulating shell and transmitted to the energy storage component. The energy storage component is connected to the monitoring component to provide the monitoring component with the required electrical energy.

[0010] The embodiment of the present invention is a float-type multi-degree-of-freedom self-powered vibration sensing device based on the suspension characteristics of magnetic liquid, which fully utilizes the motion characteristics of the permanent magnetic sphere and the magnetic liquid. The movement of the permanent magnetic sphere drives the movement of the magnetic liquid, which on the one hand causes the magnetic flux in the electromagnetic induction coil to change and generate an induced current. On the other hand, the friction between the magnetic liquid and the insulating shell can also generate current, thereby improving the efficiency of energy collection. The energy storage component can effectively store the collected electrical energy and provide the required electrical energy to the monitoring device, thereby realizing the self-power supply of the sensing device. It avoids the problem of requiring an additional power supply to maintain operation like traditional vibration sensors, reduces energy consumption and usage costs, and also reduces the difficulty of maintenance. In addition, since the movement of the permanent magnetic sphere and the magnetic liquid is related to the vibration of the vibration equipment, the working voltage output by the monitoring device can reflect the vibration condition of the vibration equipment, thereby realizing effective detection of vibration.

[0011] In some embodiments, the electromagnetic-friction composite vibration energy harvester further includes a spherical shell, which is used to wrap the permanent magnetic sphere.

[0012] In some embodiments, the spherical shell includes a first hemispherical portion and a second hemispherical portion, the first hemispherical portion and the second hemispherical portion are detachably connected, and the density of the first hemispherical portion is less than that of the second hemispherical portion.

[0013] In some embodiments, the permanent magnetic sphere has a static state and a vibrating state. In the static state, the center of the permanent magnetic sphere coincides with the center of the insulating shell, and the minimum distances between the permanent magnetic sphere and the side wall of the insulating shell, the top wall of the insulating shell, and the bottom wall of the insulating shell are all equal.

[0014] In some embodiments, the insulating shell is cylindrical, and there are multiple monitoring elements, which are arranged at intervals along the circumference of the permanent magnetic sphere.

[0015] In some embodiments, the monitoring components are divided into a first monitoring group and a second monitoring group. The first monitoring group and the second monitoring group each include a plurality of the monitoring components. The plurality of monitoring components of the first monitoring group are arranged circumferentially at intervals along the center line of the insulating shell, and the plurality of monitoring components of the second monitoring group are arranged relatively in the extension direction of the center line of the insulating shell.

[0016] In some embodiments, the shell assembly further includes a conductive layer, which is connected to the shell body and is used to adhere the insulating shell to the inner wall of the shell body, and the energy storage assembly is electrically connected to the conductive layer.

[0017] In some embodiments, in the height direction of the shell body, the height dimension of the electromagnetic coil is greater than the diameter of the permanent magnetic sphere.

[0018] In some embodiments, the monitoring device includes a Hall element, and the electromagnetic-friction composite vibration energy harvester also includes an amplifying circuit component, which is connected to the monitoring device to output the amplified signal from the output end of the amplifying circuit component.

[0019] In some embodiments, the shell body has an opening, the opening is located at the top of the shell body, and the outer peripheral wall of the insulating shell is adapted to the inner peripheral wall of the shell body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure (partial cross-section) of a float-type multi-degree-of-freedom self-powered vibration sensing device based on the suspension characteristics of magnetic liquid according to an embodiment of the present invention.

[0021] Figure 2 It is a cross-sectional schematic diagram of a float-type multi-degree-of-freedom self-powered vibration sensing device based on the suspension characteristics of magnetic liquid according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] 1. Housing assembly, 11. Housing body, 12. Insulating housing, 121. Monitoring chamber, 13. Spherical housing, 131. First hemisphere, 132. Second hemisphere, 14. Mounting seat,

[0024] 2. Permanent magnetic sphere,

[0025] 3. Electromagnetic induction coil,

[0026] 4. Monitoring items. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0028] like Figure 1 and Figure 2As shown, the floating ball type multi-degree-of-freedom self-powered vibration sensing device based on the suspension characteristics of magnetic liquid according to an embodiment of the present invention includes: a shell component 1, an electromagnetic-friction composite vibration energy harvester and an energy storage component.

[0029] The housing assembly 1 includes a housing body 11 and an insulating housing 12. The housing body 11 is used to be installed on the vibration device. The insulating housing 12 is connected to the housing body 11 and is located in the cavity of the housing body 11. The insulating housing 12 defines a monitoring chamber 121. Specifically, Figure 1 and Figure 2 As shown, the bottom of the housing body 11 is provided with a mounting base 14, which can be provided with threaded holes so that it can be fixedly connected to the vibration equipment via bolts or the like. The insulating housing 12 is installed in the cavity of the housing body 11. The housing body 11 provides a supporting and protective structure for the insulating housing 12. The monitoring chamber 121 within the insulating housing 12 also provides installation space for other components.

[0030] The electromagnetic-friction composite vibration energy harvester includes a monitoring element 4, an electromagnetic induction coil 3, a magnetic liquid and a permanent magnetic sphere 2. The electromagnetic induction coil 3 is wound around the shell body 11 and along the height direction of the shell body 11 (such as Figure 1 The permanent magnetic sphere 2 is placed in the monitoring chamber 121, the magnetic liquid is filled in the monitoring chamber 121 to be adsorbed on the permanent magnetic sphere 2, and the monitoring component 4 is connected to the insulating shell 12. The monitoring component 4 is used to monitor the magnetic field changes in the chamber 121 and output the working voltage.

[0031] It is understandable that the electromagnetic induction coil 3 is wound around the outer wall of the shell body 11, so that when the permanent magnetic sphere 2 and the magnetic liquid move in the monitoring chamber 121, it can cause a change in the magnetic flux passing through the electromagnetic induction coil 3, thereby generating an induced current. The magnetic liquid is filled in the monitoring chamber 121. When the permanent magnetic sphere 2 is placed in the magnetic liquid, since the magnetic field intensity is the largest at the surface of the permanent magnetic sphere 2, the magnetic liquid will gather on the surface of the permanent magnet to form a "magnetic liquid protective cover". Since the density of the permanent magnet is greater than that of the magnetic liquid, when the magnetic suspension force is not considered, the permanent magnetic sphere 2 will sink to the bottom of the container. During the sinking process of the permanent magnetic sphere 2, the lower surface of the permanent magnetic sphere 2 slowly approaches the bottom surface of the container, and the magnetic liquid adsorbed on the lower surface of the permanent magnetic sphere 2 is slowly squeezed by the bottom surface of the container and leaves the lower surface of the permanent magnetic sphere 2. However, due to the high magnetic field intensity at the bottom surface of the permanent magnetic sphere 2, the magnetic liquid tends to move toward the bottom surface of the permanent magnetic sphere 2. This tendency forces the permanent magnetic sphere 2 to move upward, thereby generating an upward magnetic levitation force on the permanent magnetic sphere 2. When the levitation force of the magnetic liquid and the gravity of the permanent magnetic sphere 2 reach equilibrium, the permanent magnetic sphere 2 is stably suspended in the magnetic liquid.

[0032] The energy storage component is electrically connected to the electromagnetic induction coil 3 to store the current generated by the electromagnetic induction coil 3. The energy storage component is connected to the insulating shell 12. The movement of the permanent magnetic sphere 2 drives the magnetic liquid to move, so that current is generated between the magnetic liquid and the insulating shell 12 and transmitted to the energy storage component. The energy storage component is connected to the monitoring component 4 to provide the monitoring component 4 with the required electrical energy.

[0033] It can be understood that when the permanent magnetic sphere 2 moves (that is, the vibration device vibrates and drives the shell body 11 to vibrate), the permanent magnetic sphere 2 moves relative to the electromagnetic induction coil 3 to cut the magnetic flux lines under the action of inertia, causing the magnetic flux passing through the closed circuit to change, generating an induced current inside the circuit and transmitting it to the energy storage component to facilitate the use of subsequent electrical equipment.

[0034] Furthermore, when the permanent magnetic sphere 2 moves, the electrostatic equilibrium between the insulating shell 12 and the magnetic fluid is disrupted, triggering a redistribution of positive and negative charges in the electrodes. This movement of positive and negative charges creates a charge density imbalance on the two electrodes, which in turn generates current that is transferred to the energy storage component for subsequent use by electrical devices.

[0035] It should be noted that the energy storage component also includes an AC / DC conversion module, an energy storage module, a dynamic path management module, an output power control module, and a battery monitoring and protection module. In other words, by utilizing the synergistic effect of the above-mentioned multiple modules, it is possible to convert the input AC power (such as the power grid, photovoltaic inverter output) into stable DC power to power subsequent modules. And according to the input power status (such as grid outages, renewable energy fluctuations) and load requirements, the energy source (grid / battery / hybrid power supply) is automatically switched to ensure power supply continuity. In addition, the output current / voltage can also be adjusted to match different load requirements (such as constant voltage, constant current, pulse load). Real-time monitoring of battery voltage, temperature, and health status (SOH) to prevent overcharging, over-discharge, and short circuit, thereby extending battery life.

[0036] Optionally, the monitoring element 4 may be a combination of one or more sensors, including piezoelectric materials and sensors, fiber grating sensors, strain gauges and resistive sensors, electromagnetic sensors, inertial sensors, Hall sensors, etc.

[0037] Therefore, the floating ball type multi-degree-of-freedom self-powered vibration sensing device based on the suspension characteristics of magnetic liquid in the embodiment of the present invention fully utilizes the motion characteristics of the permanent magnetic sphere 2 and the magnetic liquid. The movement of the permanent magnetic sphere 2 drives the movement of the magnetic liquid, which on the one hand causes the magnetic flux in the electromagnetic induction coil 3 to change and generate an induced current. On the other hand, the friction between the magnetic liquid and the insulating shell 12 can also generate current, thereby improving the efficiency of energy collection. The energy storage component can effectively store the collected electrical energy and provide the required electrical energy to the monitoring part 4, thereby realizing the self-power supply of the sensing device. It avoids the problem of requiring an additional power supply to maintain operation like traditional vibration sensors, reduces energy consumption and usage costs, and also reduces the difficulty of maintenance. In addition, since the movement of the permanent magnetic sphere 2 and the magnetic liquid is related to the vibration of the vibration equipment, the working voltage output by the monitoring part 4 can reflect the vibration condition of the vibration equipment, thereby realizing effective detection of vibration.

[0038] In some embodiments, the electromagnetic-friction composite vibration energy harvester includes a spherical shell 13, which is used to enclose the permanent magnetic sphere 2. It is understood that, if Figure 1 and Figure 2 As shown, the spherical shell 13 encases the permanent magnetic sphere 2 and is placed within the monitoring chamber 121. The magnetic liquid still fills the monitoring chamber 121 and is adsorbed on the spherical shell 13 encasing the permanent magnetic sphere 2. As the permanent magnetic sphere 2 moves within the monitoring chamber 121 due to the vibration of the device, it may collide with components such as the insulating shell 12. The spherical shell 13 provides a buffering and protective function, preventing damage to the permanent magnetic sphere 2 due to collisions, extending the service life of the permanent magnetic sphere 2, ensuring the magnetic stability of the permanent magnetic sphere 2, and thus ensuring the stable operation of the electromagnetic induction process.

[0039] In addition, the sphere housing 13 can provide a smoother surface, making the permanent magnetic sphere 2 move more smoothly within the monitoring chamber 121. When the permanent magnetic sphere 2 drives the magnetic liquid to move, the obstruction caused by the uneven surface of the permanent magnetic sphere 2 is reduced, allowing the magnetic liquid to move more flexibly with the sphere, improving the efficiency of generating current between the magnetic liquid and the insulating housing 12, and enhancing the stability of the magnetic flux change in the electromagnetic induction coil 3.

[0040] In some embodiments, the spherical housing 13 includes a first hemispherical portion 131 and a second hemispherical portion 132. The first hemispherical portion 131 and the second hemispherical portion 132 are detachably connected, and the density of the first hemispherical portion 131 is lower than that of the second hemispherical portion 132. The first hemispherical portion 131 and the second hemispherical portion 132 can be connected by means of a snap connection, bolts, or the like.

[0041] It is understandable that if Figure 1 and Figure 2As shown, since the density of the first hemispherical portion 131 is less than that of the second hemispherical portion 132, the permanent magnetic sphere 2 forms a "tumbler" structure in the magnetic liquid. When the permanent magnetic sphere 2 is tilted or shaken by external forces such as vibration in the monitoring chamber 121, a torque is generated due to the shift of the center of gravity to restore it to the equilibrium position, thereby allowing the permanent magnetic sphere 2 to move smoothly in the magnetic liquid.

[0042] That is to say, when the vibration equipment vibrates, the permanent magnetic sphere 2 may originally shake violently in the monitoring chamber 121 due to the vibration, and even collide with the insulating shell 12, etc. However, the "tumbler" structure enables the permanent magnetic sphere 2 to quickly return to a relatively stable state during movement, reducing unnecessary shaking and collisions. This helps to protect the permanent magnetic sphere 2 and surrounding components and extend its service life. The smooth movement makes the magnetic field changes around the permanent magnetic sphere 2 more stable and regular. The monitoring component 4 can more accurately capture this stable magnetic field change, thereby outputting a more stable and reliable working voltage signal, thereby improving the accuracy and stability of the sensor device in vibration monitoring.

[0043] Optionally, the first hemispherical portion 131 may be made of a plastic material, and the second hemispherical portion 132 may be made of a metal material.

[0044] In some embodiments, the permanent magnetic sphere 2 has a static state and a vibrating state. In the static state, the center of the permanent magnetic sphere 2 coincides with the center of the insulating shell 12, and the minimum distances between the permanent magnetic sphere 2 and the side walls of the insulating shell 12, the top wall of the insulating shell 12, and the bottom wall of the insulating shell 12 are all equal.

[0045] It is understood that when the center of the permanent magnetic sphere 2 coincides with the center of the insulating shell 12 and the distances around them are equal, a clear and unified initial state is provided for the entire sensing device. When performing vibration monitoring, all measurements and analyses can be carried out based on this initial state, making the measurement results at different times and in different environments comparable. For example, whenever monitoring of a vibrating device begins, this initial position of the permanent magnetic sphere 2 can be used as a reference to accurately determine the position changes caused by vibration.

[0046] In other words, a uniform initial position distribution helps reduce the accumulation of measurement errors. If the permanent magnet sphere 2 has large position deviations in its initial state, these deviations may continue to increase over time and with increasing vibration frequency during subsequent vibration monitoring, leading to inaccurate measurement results. Symmetrical initial positions can avoid this and improve monitoring accuracy.

[0047] In some embodiments, the insulating housing 12 is cylindrical, and the number of monitoring elements 4 is multiple, with the multiple monitoring elements 4 being spaced apart along the circumference of the permanent magnetic sphere 2. It will be appreciated that the insulating housing 12 is cylindrical, defining a regular monitoring chamber 121. The permanent magnetic sphere 2 is placed within the cylindrical monitoring chamber 121, and the multiple monitoring elements 4 are spaced apart along the circumference of the permanent magnetic sphere 2 on the insulating housing 12. This arrangement enables the monitoring elements 4 to monitor changes in the magnetic field around the permanent magnetic sphere 2 from multiple angles.

[0048] That is, in actual vibration environments, magnetic field variations can be very complex, not just simple linear changes. The configuration of multiple monitoring elements 4 can capture more complex magnetic field patterns, such as rotational and torsion variations. This facilitates more accurate analysis of the vibration characteristics of vibrating equipment and is of great significance for detecting complex vibration patterns.

[0049] Furthermore, the magnetic field change data acquired by multiple monitoring components 4 can complement and verify each other. If a monitoring component 4 malfunctions or is disturbed and outputs abnormal data, the data from other monitoring components 4 can be used as a reference. Through comparison and analysis, the abnormality can be promptly discovered and eliminated, thus improving the reliability of the monitoring data.

[0050] In some embodiments, the monitoring components 4 are divided into a first monitoring group and a second monitoring group. The first monitoring group and the second monitoring group both include multiple monitoring components 4. The multiple monitoring components 4 of the first monitoring group are arranged circumferentially along the center line of the insulating shell 12, and the multiple monitoring components 4 of the second monitoring group are relatively arranged in the extension direction of the center line of the insulating shell 12.

[0051] It is understandable that if Figure 1 and Figure 2 As shown, the first monitoring group is arranged circumferentially along the centerline of the insulating shell 12. It can monitor the magnetic field changes caused by the horizontal circumferential movement of the permanent magnetic sphere 2, and can capture the magnetic field information generated by the horizontal rotation and horizontal swing of the permanent magnetic sphere 2. The second monitoring group is arranged opposite to the centerline extension direction (i.e., on the top and bottom walls of the insulating shell 12), and is responsible for monitoring the magnetic field changes caused by the vertical movement of the permanent magnetic sphere 2, such as up and down jumping. The combination of the two achieves all-round, no-blind-angle monitoring of the magnetic field around the permanent magnetic sphere 2, which can more comprehensively reflect the motion state of the permanent magnetic sphere 2.

[0052] Preferably, the first monitoring group includes four monitoring elements 4, which are evenly spaced and arranged on the side walls of the insulating housing 12. The second monitoring group includes two monitoring elements 4, one located on the upper wall of the insulating housing 12 and the other located on the lower wall of the insulating housing 12. Thus, multiple monitoring elements 4 can monitor vibration in six directions in a three-dimensional state.

[0053] In some embodiments, the shell assembly 1 further includes a conductive layer, which is connected to the shell body 11 and is used to adhere the insulating shell 12 to the inner wall of the shell body 11 , and the energy storage assembly is electrically connected to the conductive layer.

[0054] It's understandable that the reciprocating motion of the magnetic fluid disrupts the electrostatic equilibrium between the insulating layer and the magnetic fluid, triggering a redistribution of positive and negative charges in the electrodes. This movement of positive and negative charges creates an imbalance in charge density between the two electrodes, leading to the generation of current. The conductive layer transmits this generated current to the energy storage component, facilitating its subsequent use in electrical devices.

[0055] Optionally, the insulating layer may be a PTFE film, and the conductive layer may be a copper tape.

[0056] In some embodiments, in the height direction of the housing body 11 , the height dimension of the electromagnetic coil is greater than the diameter of the permanent magnetic sphere 2 .

[0057] It is understandable that when the permanent magnetic sphere 2 moves within the monitoring chamber 121 in response to the vibration of the vibration device, because the height of the electromagnetic induction coil 3 is greater than the diameter of the permanent magnetic sphere 2, the vertical movement of the permanent magnetic sphere 2 can pass through more of the space occupied by the electromagnetic induction coil 3. According to the law of electromagnetic induction, changes in magnetic flux generate an induced electromotive force. The movement of the permanent magnetic sphere 2 causes the magnetic flux passing through the electromagnetic induction coil 3 to change more frequently and significantly, thereby generating a larger induced current in the electromagnetic induction coil 3.

[0058] In other words, because the electromagnetic induction coil 3 can more fully capture the motion of the permanent magnetic sphere 2, the induced current it generates is relatively stable. Stable energy output is crucial for charging the energy storage component and powering subsequent components such as the monitoring unit 4. It reduces damage to the energy storage component and other components caused by excessive energy fluctuations, thereby extending the life of the device.

[0059] In some embodiments, the monitoring component 4 includes a Hall element, and the electromagnetic-friction composite vibration energy harvester further includes an amplifying circuit component, which is connected to the monitoring component 4 to output the amplified signal from the output end of the amplifying circuit component.

[0060] Understandably, the signals output by Hall effect elements are often quite weak and may not be directly usable for subsequent signal processing and analysis. Amplifier circuit components amplify the weak electrical signals output by Hall effect elements, increasing them to sufficient strength for subsequent circuits or devices to accurately identify and process these signals. For example, in practical applications, the signal output by a Hall effect element may be only a few millivolts or even lower. After amplification by the amplifier circuit, the signal amplitude can be increased to several volts, greatly enhancing the signal's detectability.

[0061] That is, during signal transmission and processing, external noise may be incorporated into the Hall element's output signal, affecting signal quality. Amplifier circuit components typically employ filtering and anti-interference measures to suppress and filter noise to a certain extent while amplifying the signal. This results in a purer output signal, reduces the impact of noise on subsequent signal analysis and judgment, and improves signal reliability and accuracy. Amplifier circuit components can also optimize the signal waveform, adjusting parameters such as the amplitude and phase to ensure that the waveform more closely matches the requirements of subsequent processing equipment.

[0062] In some embodiments, the housing body 11 has an opening, which is located at the top of the housing body 11 , and the outer circumferential wall of the insulating housing 12 is adapted to the inner circumferential wall of the housing body 11 .

[0063] It is understandable that if Figure 1 and Figure 2 As shown, the opening at the top of the housing body 11 allows the insulating housing 12 to be smoothly installed into the housing body 11 from the top. This design simplifies the installation process, eliminating the need for complex assembly processes or disassembly of other components, reducing installation difficulty and cost. This improves production efficiency during manufacturing and reduces installation time and labor during on-site installation.

[0064] That is, when it is necessary to inspect, repair, or replace the permanent magnetic sphere 2, magnetic liquid, or monitoring element 4 within the insulating housing 12, the insulating housing 12 can be conveniently removed or inserted through the top opening. This greatly improves the convenience of maintenance, reduces maintenance time and costs, helps to promptly restore the normal operation of the sensing device, and reduces downtime caused by equipment failure.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0067] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0068] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0069] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0070] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A float-type multi-degree-of-freedom self-powered vibration sensing device based on the suspension characteristics of magnetic liquid, characterized in that: include: a housing assembly comprising a housing body and an insulating housing, wherein the housing body is adapted to be mounted on the vibration device, the insulating housing being connected to the housing body and positioned within a cavity of the housing body, and the insulating housing defining a monitoring chamber; An electromagnetic-friction composite vibration energy harvester, comprising a monitoring element, an electromagnetic induction coil, a magnetic fluid, and a permanent magnetic sphere. The electromagnetic induction coil is wound around the housing body and extends along the height direction of the housing body. The permanent magnetic sphere is placed in the monitoring chamber. The magnetic fluid is filled in the monitoring chamber to be adsorbed on the permanent magnetic sphere. The monitoring element is connected to the insulating housing and is used to monitor changes in the magnetic field in the monitoring chamber and output an operating voltage. An energy storage component is electrically connected to the electromagnetic induction coil to store the current generated by the electromagnetic induction coil. The energy storage component is connected to the insulating shell. The movement of the permanent magnetic sphere drives the movement of the magnetic liquid, so that current is generated between the magnetic liquid and the insulating shell and transmitted to the energy storage component. The energy storage component is connected to the monitoring component to provide the monitoring component with the required electrical energy.

2. The floating ball type multi-degree-of-freedom self-powered vibration sensing device based on the magnetic liquid suspension characteristics according to claim 1 is characterized in that: The electromagnetic-friction composite vibration energy harvester further includes a spherical shell, which is used to wrap the permanent magnetic sphere.

3. The floating ball type multi-degree-of-freedom self-powered vibration sensing device based on the magnetic liquid suspension characteristics according to claim 2 is characterized in that: The spherical shell includes a first hemispherical portion and a second hemispherical portion, wherein the first hemispherical portion and the second hemispherical portion are detachably connected, and the density of the first hemispherical portion is smaller than that of the second hemispherical portion.

4. The floating ball type multi-degree-of-freedom self-powered vibration sensing device based on the magnetic liquid suspension characteristics according to claim 3 is characterized in that: The permanent magnetic sphere has a static state and a vibrating state. In the static state, the center of the permanent magnetic sphere coincides with the center of the insulating shell, and the minimum distances between the permanent magnetic sphere and the side wall of the insulating shell, the top wall of the insulating shell, and the bottom wall of the insulating shell are all equal.

5. The floating ball type multi-degree-of-freedom self-powered vibration sensing device based on the suspension characteristics of magnetic liquid according to claim 4 is characterized in that: The insulating shell is cylindrical, and there are a plurality of monitoring components, which are arranged at intervals along the circumference of the permanent magnetic sphere.

6. The floating ball type multi-degree-of-freedom self-powered vibration sensing device based on the magnetic liquid suspension characteristics according to claim 5 is characterized in that: The monitoring components are divided into a first monitoring group and a second monitoring group. The first monitoring group and the second monitoring group each include a plurality of monitoring components. The plurality of monitoring components of the first monitoring group are arranged at circumferential intervals along the center line of the insulating shell, and the plurality of monitoring components of the second monitoring group are arranged relatively in the extension direction of the center line of the insulating shell.

7. The float-type multi-degree-of-freedom self-powered vibration sensing device based on the suspension characteristics of magnetic liquid according to any one of claims 1 to 6, characterized in that: The shell assembly further includes a conductive layer, which is connected to the shell body and is used to adhere the insulating shell to the inner circumferential wall of the shell body. The energy storage assembly is electrically connected to the conductive layer.

8. The floating ball type multi-degree-of-freedom self-powered vibration sensing device based on the magnetic liquid suspension characteristics according to claim 7 is characterized in that: In the height direction of the shell body, the height dimension of the electromagnetic coil is greater than the diameter of the permanent magnetic sphere.

9. The floating ball type multi-degree-of-freedom self-powered vibration sensing device based on the magnetic liquid suspension characteristics according to claim 8, characterized in that: The monitoring component includes a Hall element, and the electromagnetic-friction composite vibration energy harvester also includes an amplifying circuit component. The amplifying circuit component is connected to the monitoring component to output the amplified signal from the output end of the amplifying circuit component.

10. The floating ball type multi-degree-of-freedom self-powered vibration sensing device based on the magnetic liquid suspension characteristics according to claim 9, characterized in that: The shell body has an opening, and the opening is located at the top of the shell body. The outer peripheral wall of the insulating shell is adapted to the inner peripheral wall of the shell body.

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