A closed-loop vibration control device based on temperature difference power generation

Abstract

The present invention relates to an active vibration control device based on thermoelectric power generation. A friction plate is connected between the load platform and the base platform, which can convert the potential energy generated by the vibration into thermal energy, providing a heat source for the thermoelectric generator to generate electrical energy. The thermoelectric generator works based on the Seebeck effect and is mainly used to convert the thermal energy generated by the friction plate into electrical energy, which is then transmitted to the voice coil motor via a power supply wire to act on active vibration control. The present invention effectively utilizes the energy generated by the mechanical device when it vibrates, and in turn suppresses its vibration. When the system stops operating, the vibration is also completely suppressed, and the system forms a closed loop, thereby improving energy utilization.

Description

Technical Field

[0001] The present invention relates to the field of active vibration control, and in particular to a closed-loop vibration control device based on temperature difference power generation. Background Art

[0002] Vibration is a phenomenon that can cause adverse effects when machinery and other equipment are in operation. It is a widespread phenomenon in all aspects of our lives, posing a threat to personal safety, natural resources, and the safety of machinery and equipment. Numerous methods have been employed to control and eliminate this phenomenon, including active vibration control, which involves applying additional force to eliminate the effects of vibration.

[0003] The vibration reduction devices currently in use are basically equipment that requires additional energy supply and has a relatively stable working environment. However, their batteries or other energy storage devices take up a large space and generate adverse effects such as heat and noise. The active vibration control device proposed in the present invention can generate electricity through frictional heat generated by vibration, and use this electricity to drive the vibration reduction device to suppress vibration. When the vibration is suppressed to the target value, the generated electricity is not enough to drive the vibration reduction device, and the entire system stops running. This makes good use of the energy generated by the mechanical device when it generates vibration, and in turn suppresses its vibration. When the system stops running, the vibration is also completely suppressed, and the system forms a closed loop.

[0004] Chinese patent document CN111930012A proposes a closed-loop control method for a magnetorheological actuator. The method uses a monitoring system to monitor the changes in damping force / torque in real time, and then selects the corresponding control mode based on error information and mapping relationships to obtain smoother control current / voltage.

[0005] Chinese patent document CN115289865A proposes a nuclear steam waste heat recovery device based on thermoelectric power generation. The thermoelectric generator fully utilizes the waste heat of nuclear steam, converting it into electricity and storing it in batteries. The vibration reduction devices used in the above-mentioned prior art generally require additional power supply and operate in a relatively stable environment. However, their batteries or other energy storage devices occupy a large space and generate heat, noise, and other adverse effects. Summary of the Invention

[0006] The purpose of the present invention is to provide a closed-loop vibration control device based on temperature difference power generation to solve the problems existing in the above-mentioned prior art. Such a device is safe and reliable and improves energy utilization.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] A closed-loop vibration control device based on thermoelectric power generation, characterized by comprising a thermoelectric power generation device, a voice coil motor, a restoring spring, a base platform and a load platform;

[0009] The load platform is arranged above the voice coil motor, and the load platform is used to carry a vibration target object;

[0010] The voice coil motor is used to actively control and offset the vibration of the vibrating target object on the load platform;

[0011] The restoring spring is arranged around the voice coil motor and fixed between the load platform and the base platform, and the restoring spring is used to restore the displacement after vibration;

[0012] The thermoelectric power generation device is arranged around the restoring spring. The thermoelectric power generation device is used to collect potential energy when the load platform and the base platform generate vibration displacement, convert the thermal energy into electrical energy through the friction plate in the thermoelectric power generation device, and then transmit the electrical energy to the voice coil motor so that the voice coil motor acts on active vibration control. The friction plate is arranged between the load platform and the base platform.

[0013] Optionally, the thermoelectric power generation device includes an upper friction arm, a lower friction arm, a thermoelectric generator and a friction plate. The lower friction arm is fixed to the base platform and is tightly connected to the thermoelectric generator, serving as the cold end of the thermoelectric generator; the upper friction arm is fixed to the load platform and is connected to the friction plate. When the friction plate vibrates, it generates frictional heat with the thermoelectric generator, serving as the hot end of the thermoelectric generator.

[0014] Optionally, a closed-loop vibration control device housing is also included, and the temperature difference power generation device, voice coil motor, return spring, base platform, load platform and power supply wire are all arranged inside the closed-loop vibration control device housing. The closed-loop vibration control device housing is used to isolate external interference, prevent excess heat dissipation, and improve thermoelectric conversion efficiency.

[0015] Optionally, a power supply wire is further included, which is connected between the thermoelectric power generation device and the voice coil motor, and is used to transmit the electric energy converted by the thermoelectric power generation device when the load platform and the base platform generate vibration displacement to the voice coil motor.

[0016] Optionally, the vibration target object is fixed on the load platform by using a clamp or adhesive.

[0017] Optionally, the restoring spring is fixed to the load platform and the base platform through a slot or welding.

[0018] Optionally, the working principle of the thermoelectric generator is based on the Seebeck effect, and the basic working unit of the thermoelectric generator is a PN junction made of a Te-Bi compound, and the number of PN junctions can be adjusted according to requirements.

[0019] Optionally, the material of the friction plate, the contact area between the friction plate and the thermoelectric generator, and the roughness of the contact surface can be adjusted and modified according to actual application requirements, so that the output power can be adjusted to meet the needs of different applications.

[0020] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0021] The present invention incorporates a friction plate connected between the load platform and the base platform, converting the potential energy generated by vibration into heat, providing a heat source for the thermoelectric generator, which generates electricity. The thermoelectric generator converts the heat generated by the friction plate into electricity, which is then transmitted via power lines to the voice coil motor for active vibration control. This invention effectively utilizes the energy generated by the mechanical device during vibration, suppressing it. When the system stops operating, the vibration is also suppressed, forming a closed loop and improving energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 1 is an overall structural diagram of a closed-loop vibration control device according to an embodiment of the present invention;

[0024] Figure 2 A top view of a closed-loop vibration control device according to an embodiment of the present invention;

[0025] Figure 3 It is a right side view of the closed-loop vibration control device in an embodiment of the present invention;

[0026] Figure 4 This is a general structural diagram of a thermoelectric power generation device according to an embodiment of the present invention;

[0027] Figure 5 This is a structural diagram of a friction plate in an embodiment of the present invention;

[0028] Figure 6 2 is a schematic diagram of a closed-loop vibration control device according to an embodiment of the present invention;

[0029] Figure 7 1 is a comparison diagram of the transmissibility curves of a general vibration absorber and a closed-loop vibration control device in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] The purpose of the present invention is to provide a closed-loop vibration control device based on temperature difference power generation to solve the problems existing in the above-mentioned prior art. Such a device is safe and reliable and improves energy utilization.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Figure 1 The figure shows the overall structure of a closed-loop vibration control device according to an embodiment of the present invention. A closed-loop vibration control device based on thermoelectric power generation includes a closed-loop vibration control device housing 1, a thermoelectric power generation device 2, a voice coil motor 3, a return spring 4, a base platform 5, and a load platform 6.

[0034] The thermoelectric power generation device 2, voice coil motor 3, return spring 4, base platform 5, load platform 6 and power supply wire are all arranged inside the closed-loop vibration control device housing 1. The closed-loop vibration control device housing 1 is used to isolate external interference, prevent excess heat dissipation, and improve thermoelectric conversion efficiency.

[0035] The load platform 6 is positioned above the voice coil motor 3 and is used to support a vibrating target object. The voice coil motor 3 is used to actively control and offset the vibrations generated by the vibrating target object on the load platform 6. Its electrical energy is provided by a thermoelectric generator and transmitted to the voice coil motor 3 via power supply wires. The return spring 4 is positioned around the voice coil motor 3 and fixed between the load platform 6 and the base platform 5. The return spring 4 is used to restore displacement after vibration and can be fixed to the load platform 6 and base platform 5 or the foundation via slots or welding. The thermoelectric generator 2 is positioned around the return spring 4 and is used to collect the potential energy generated by the vibration displacement of the load platform 6 and base platform 5. The thermoelectric generator 2 is converted into electrical energy via friction plates and then transmitted to the voice coil motor 3, enabling the voice coil motor 3 to perform active vibration control. The base platform 5 supports the entire vibration reduction system. When the object carried by the load platform 6 vibrates, the relative position of the load platform 6 and the base platform 5 changes, causing the friction plate to emit heat energy, which is then converted into electrical energy by the thermoelectric generator 2 for use by the voice coil motor 3.

[0036] Figure 2This is a top view of a closed-loop vibration control device according to an embodiment of the present invention. 201 is the lower friction arm, secured to the base platform 5 or foundation via slots or welding. A significant portion of one side, occupying a significant area, is secured to a thermoelectric generator, serving as the generator's cold end, allowing the generator to generate a temperature difference and thereby generate electrical energy. 202 is the thermoelectric generator, which operates based on the Seebeck effect. Its basic operating unit is a PN junction made of a Te-Bi compound, and the number of PN junctions can be adjusted as required. This design allows for adjustable output power, a simple and easy-to-understand structure, and no interference issues. The end in contact with the friction plate is the hot end, while the fixed portion in contact with the lower friction arm is the cold end. During operation, the hot and cold ends of the thermoelectric generator generate a temperature difference when the load platform 6 and base platform 5 vibrate and displace, causing the PN junction to operate in a thermoelectric power generation state, generating electrical energy. This energy is then transmitted via power supply wires to the voice coil motor 3, where it contributes to active vibration control. The friction plate 203 is primarily used to convert the potential energy between the load platform 6 and the base platform 5 into heat energy when they vibrate. The friction plate is fixed to the upper friction arm. When the load platform 6 and the base platform 5 vibrate, friction generates heat, providing a heat source for the thermoelectric generator to generate electricity. The friction plate's material, contact area with the thermoelectric generator, and contact surface roughness can be adjusted according to actual application requirements, enabling adjustable output power. The structure is simple, the layout is flexible, and the design meets the design diversity criteria. 204 is the upper friction arm, fixed to the load platform 6. A portion of one side, which occupies a significant area, is fixedly attached to the friction plate. When vibrating, friction generates heat with the thermoelectric generator. This serves as the hot end of the thermoelectric generator, cooperating with the cold end formed by the lower friction arm to enable the thermoelectric generator to operate normally and generate electricity. 7 is a power supply wire, connected between the thermoelectric generator and the voice coil motor 3. Its function is to transmit the electrical energy converted by the thermoelectric generator when the load platform 6 and the base platform 5 vibrate to the voice coil motor 3, enabling it to contribute to active vibration control.

[0037] Figure 3 It is a right side view of the closed-loop vibration control device in an embodiment of the present invention.

[0038] The thermoelectric generator 2 includes an upper friction arm, a lower friction arm, a thermoelectric generator and a friction plate. Figure 4The figure shows the overall structure of a thermoelectric generator according to an embodiment of the present invention. The lower friction arm is fixed to a base platform 5 or foundation and tightly connected to the thermoelectric generator, serving as the cold end of the thermoelectric generator, allowing it to generate electrical energy. The basic operating unit of the thermoelectric generator is a PN junction made of a Te-Bi compound, and the number of PN junctions can be adjusted as required. The end in contact with the friction plate is the hot end, while the fixed portion in contact with the lower friction arm is the cold end. During operation, a temperature difference is created between the hot and cold ends of the thermoelectric generator, generating electrical energy, which is then transmitted to the voice coil motor 3 via power supply wires. The friction plate primarily generates heat, providing a heat source for the thermoelectric generator to generate electrical energy. The upper friction arm is fixed to a load platform 6 and connected to a friction plate. When vibrating, it generates frictional heat with the thermoelectric generator, acting as the hot end of the thermoelectric generator and cooperating with the cold end formed by the lower friction arm to generate electrical energy.

[0039] Figure 5 This diagram illustrates the structure of a friction plate in an embodiment of the present invention. The friction plate primarily converts upward and downward potential energy into heat energy when the load platform 6 and base platform 5 vibrate and displace. The friction plate is attached to the upper friction arm. When the load platform 6 and base platform 5 vibrate and displace, frictional heat is generated, providing a heat source for the thermoelectric generator, enabling it to generate electrical energy. The roughened surface shown in the diagram is in close contact with the thermoelectric generator. The friction plate's material, contact area, and contact surface roughness can be adjusted based on actual application requirements, enabling adjustable output power to meet diverse application needs.

[0040] Figure 6 8 is a schematic diagram of a closed-loop vibration control device according to an embodiment of the present invention, wherein 8 represents the cold end of the heater and 9 represents the hot end of the heater.

[0041] Figure 7 This figure compares the transmissibility curves of a general vibration damper and the closed-loop vibration control device according to an embodiment of the present invention. The solid line in the figure shows that the general vibration damper exhibits poor resonance suppression at its natural frequency, indicating suboptimal vibration damping performance. Furthermore, the natural frequency is relatively high, implying that the vibration damper's vibration damping range is insufficient and cannot suppress vibrations over a wide frequency range. The dashed line in the figure shows the transmissibility curve for the closed-loop vibration control device according to an embodiment of the present invention with a friction plate roughness of R. The dotted line shows the transmissibility curve for the closed-loop vibration control device according to an embodiment of the present invention with a friction plate roughness of 2R. The dashed-dotted line shows the transmissibility curve for the closed-loop vibration control device according to an embodiment of the present invention with a friction plate roughness of 3R. It can be seen that as the friction plate roughness increases, the resonance suppression effect at the natural frequency becomes increasingly better, the vibration damping performance of the vibration damper also increases, the system vibration amplitude decreases, the natural frequency shifts forward, and the vibration damping frequency range of the vibration damper also increases.

[0042] The active vibration control device proposed in this invention generates electricity through frictional heat generated by vibration, which is then used to drive a vibration damping device to suppress vibration. When the vibration is suppressed to the target value, the generated electricity is no longer sufficient to drive the vibration damping device, and the entire system stops operating. This effectively utilizes the energy generated by the mechanical device's vibrations, which in turn suppresses the vibrations. When the system stops operating, the vibrations are also suppressed, forming a closed loop.

[0043] Compared with the prior art, the present invention has the following advantages:

[0044] 1. This invention relates to a thermoelectric generator based on the Seebeck effect. This device converts frictional heat into electrical energy, serving as the system's energy conversion device. The number of integrated PN junctions, its basic component, can be adjusted as required. This configuration increases output power while offering a simple structure, flexible layout, and noiselessness, meeting diverse design criteria.

[0045] 2. The thermoelectric generator makes full use of the energy consumption generated by vibration, collects heat energy through the friction plate, converts it into electrical energy in the thermoelectric generator, and transmits it to the voice coil motor to suppress vibration.

[0046] 3. When the vibration is within the normal operating range, the system will perform normal vibration reduction work. When the vibration is suppressed to a harmless value, the system will stop the vibration reduction work, forming a closed-loop vibration reduction process.

[0047] 4. The roughness and contact area of the friction plate can be adjusted as required, so that the heat energy input of the system can be adjusted and has flexibility and diversity.

[0048] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0049] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A closed-loop vibration control device based on temperature difference power generation, characterized in that: It includes a thermoelectric generator, a voice coil motor, a base platform and a load platform; The load platform is arranged above the voice coil motor, and the load platform is used to carry a vibration target object; The voice coil motor is used to actively control and offset the vibration of the vibrating target object on the load platform; The thermoelectric power generation device is used to collect the potential energy generated by the vibration displacement of the load platform and the base platform, convert the thermal energy into electrical energy through the friction plate in the thermoelectric power generation device, and then transmit the electrical energy to the voice coil motor so that the voice coil motor acts on active vibration control. The friction plate is arranged between the load platform and the base platform.

2. The closed-loop vibration control device based on thermoelectric power generation according to claim 1, characterized in that: The thermoelectric power generation device includes an upper friction arm, a lower friction arm, a thermoelectric generator and a friction plate. The lower friction arm is fixed to the base platform and is tightly connected to the thermoelectric generator, serving as the cold end of the thermoelectric generator; the upper friction arm is fixed to the load platform and is connected to the friction plate. When the friction plate vibrates, it generates frictional heat with the thermoelectric generator, serving as the hot end of the thermoelectric generator.

3. The closed-loop vibration control device based on thermoelectric power generation according to claim 1, characterized in that: It also includes a restoring spring and a closed-loop vibration control device housing; the restoring spring is arranged around the voice coil motor and fixed between the load platform and the base platform, and the restoring spring is used to recover the displacement after vibration; the thermoelectric power generation device is arranged around the restoring spring; the thermoelectric power generation device, voice coil motor, restoring spring, base platform, load platform and power supply wires are all arranged inside the closed-loop vibration control device housing, and the closed-loop vibration control device housing is used to isolate external interference, prevent excess heat dissipation, and improve thermoelectric conversion efficiency.

4. The closed-loop vibration control device based on thermoelectric power generation according to claim 1, characterized in that: It also includes a power supply wire, which is connected between the thermoelectric power generation device and the voice coil motor. The power supply wire is used to transmit the electric energy converted by the thermoelectric power generation device when the load platform and the base platform generate vibration displacement to the voice coil motor.

5. The closed-loop vibration control device based on thermoelectric power generation according to claim 1, characterized in that: The vibration target object is fixed on the load platform by using a clamp or adhesive.

6. The closed-loop vibration control device based on thermoelectric power generation according to claim 3, characterized in that: The restoring spring is fixed to the load platform and the base platform through a slot or welding.

7. The closed-loop vibration control device based on thermoelectric power generation according to claim 2, characterized in that: The working principle of the thermoelectric generator is based on the Seebeck effect. The basic working unit of the thermoelectric generator is a PN junction made of a Te-Bi compound, and the number of PN junctions can be adjusted according to requirements.

8. The closed-loop vibration control device based on thermoelectric power generation according to claim 2, characterized in that: The material of the friction plate, the contact area between the friction plate and the thermoelectric generator, and the roughness of the contact surface can be adjusted and modified according to actual application requirements, so that the output power can be adjusted to meet the needs of different applications.

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