An eddy current damping device and a method of mounting the same

Abstract

This invention discloses an eddy current damping device and its installation method, relating to the field of damper technology. The eddy current damping device disclosed in this invention includes a magnetic back iron, a magnet, a conductor plate, and a conductor back iron arranged sequentially. The magnet is mounted on the magnetic back iron, and the conductor plate is mounted on the conductor back iron. The magnetic back iron includes a magnetic back iron plate and several mounting iron plates mounted on the magnetic back iron plate. Each mounting iron plate has at least two evenly distributed magnets. The installation method includes: fixing the magnets to the mounting iron plates to form several installation units; transporting the assembled eddy current damping device installation units, magnetic back iron plate, conductor plate, and conductor back iron to the construction site, fixing the installation units to the magnetic back iron plate, and mounting the conductor plates on the conductor back iron. The eddy current damping device and installation method disclosed in this invention are quick, reliable, and have low losses during installation.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology, and in particular to an eddy current damping device and its installation method. Background Technology

[0002] A typical plate-type eddy current damping device usually includes a magnet, a magnet back iron, a conductor plate, and a conductor back iron. Its structure and magnetic field diagram are shown below. Figure 1 As shown. This type of plate-type eddy current damping device features high energy efficiency and non-contact damping components. As the damping generating element of a tuned mass damper, it is currently widely used in vibration reduction engineering. It is particularly prevalent in civil engineering, especially in bridges and buildings. For example, the 1000-ton damper in the Shanghai Tower uses this type of plate-type eddy current damping device. Due to limited on-site installation space or transportation capacity, the damper needs to be transported to the construction site in parts for assembly. The magnets, which generate damping, also need to be assembled on-site. However, magnets are very brittle and easily break upon impact. Furthermore, their strong attraction can cause hand injuries during on-site installation. Additionally, the installation space, environment, and tools available at construction sites are less convenient than in a workshop. Therefore, an eddy current damping device that is easy to assemble quickly and reliably on-site without reducing the damping effect is needed. Summary of the Invention

[0003] The purpose of this application is to overcome the problem of inconvenient on-site installation of magnets in existing eddy current damping devices. It provides an eddy current damping device by adding a magnet back plate mounting plate to the back plate on which the magnet is mounted, forming an installation unit. This facilitates the installation of the unit in the workshop or production line and its transport to the construction site for installation. This significantly reduces the attraction force of the magnet on the magnet back plate during the installation of the magnet into the damper, reducing damage and injury to the magnet during on-site installation. It also improves on-site installation efficiency, shortens the construction period, and enables rapid and reliable installation of the eddy current damping device without reducing the damping effect.

[0004] The present invention also discloses an installation method for an eddy current damping device.

[0005] To achieve the above-mentioned objectives, this application provides the following technical solutions:

[0006] An eddy current damping device includes a magnetic back iron, a magnet, a conductor plate, and a conductor back iron arranged sequentially. The magnet is mounted on the magnetic back iron, and the conductor plate is mounted on the conductor back iron. The magnetic back iron includes a magnetic back iron plate and a plurality of mounting iron plates mounted on the magnetic back iron plate. At least two evenly distributed magnets are mounted on each of the mounting iron plates.

[0007] It should be noted that the length and width of the mounting plate are smaller than those of the magnet back plate. Multiple mounting plates can typically be installed on each magnet back plate, and at least two evenly distributed magnets can be mounted on each mounting plate. When two adjacent magnets are mounted on the mounting plate, their magnetic poles are in opposite directions; that is, the N pole of one adjacent magnet contacts the mounting plate, and the S pole of the other adjacent magnet contacts the mounting plate. Furthermore, the mounting plates are also evenly distributed on the magnet back plate, ensuring that the magnets are also evenly distributed on the magnet back plate.

[0008] In the above technical solution, the magnet is mounted on the mounting plate, forming a complete installation unit. Then, the magnet is mounted on the back plate of the magnet. This avoids the problem of having to assemble the magnet on-site when it is directly mounted on the back plate. The installation unit formed by the magnet and the mounting plate can be pre-assembled in the workshop and then transported and installed on-site. This does not affect the eddy current damping performance and enables the rapid and convenient installation of the eddy current damping device.

[0009] Furthermore, a magnetically conductive partition is provided between two adjacent magnets to reduce the attraction between the two adjacent magnets, and at the same time, it can also reduce the attraction of the magnets to objects that may come close, such as steel plates.

[0010] Furthermore, the magnetically conductive partition is made of steel plate, which allows it to reduce the magnetic attraction between two adjacent magnets while also serving a magnetically conductive function.

[0011] Furthermore, the height of the magnetically conductive partition is less than or equal to the height of the magnet, allowing the conductor plate and conductor back iron to move freely relative to the magnet without affecting the installation of the conductor plate and conductor back iron.

[0012] Furthermore, the magnet is fixed to the mounting plate by at least one countersunk screw, thereby fixing the magnet to the mounting plate and forming a stable mounting unit.

[0013] Furthermore, the mounting plate is fixed to the magnet back plate by at least two screws.

[0014] Furthermore, the adjacent mounting plates are in close contact, so that the magnets are arranged in a matrix on the magnet back plate.

[0015] Furthermore, the conductor plate is a copper plate or an aluminum plate, which has high electrical conductivity.

[0016] It should be noted that the conductor back iron, mounting iron plate and magnet back iron plate are preferably made of electrical pure iron with high magnetic permeability.

[0017] The present invention also discloses an installation method for the above-mentioned eddy current damping device, which includes the following steps:

[0018] The magnets are fixed on the mounting iron plate to form a mounting unit; at least two magnets are evenly arranged on each mounting iron plate, and there is a gap between adjacent magnets;

[0019] The installation unit, magnet back iron plate, conductor plate, and conductor back iron that make up the eddy current damping device are transported to the construction site. The magnet back iron plate is installed, and the installation unit is fixed on the magnet back iron plate. The conductor plate and conductor back iron are installed so that the conductor plate cuts the magnetic field lines of the magnet when it moves relative to the installation unit.

[0020] In existing technologies, magnets are typically installed directly on-site, but the poor installation environment at these sites hinders installation. Furthermore, because magnets are brittle, their edges are easily broken during transportation and installation, leading to damage. Additionally, when magnets are directly mounted on a single piece of magnet backing, the strong attraction makes removal difficult, especially for heavier magnets, potentially causing injury to operators. In the above-mentioned technical solution, the installation step of fixing the magnets to the mounting plate is performed in the workshop or production area, creating easily transportable and installable units. These units are then transported to the project site and installed on the magnet backing plate. Since the magnets' positions are already fixed, damage during transportation and installation is avoided. At the project site, only the installation units need to be installed on the magnet backing plate, resulting in faster installation, shorter project cycles, and improved construction time. The installation environment and convenience for the magnets are also significantly improved.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This application discloses an eddy current damping device, which divides the magnet back iron of the mounted magnet into two parts. The magnet is placed on the mounting iron plate and the mounting iron plate is mounted on the magnet back iron plate, which facilitates the installation and transportation of the eddy current damping device. In addition, the mounting iron plate is also provided with several partitions that separate the magnets, which reduces the magnetic attraction between two adjacent magnets and confines the magnetic field of the magnets within the range formed by the magnetically conductive partitions, thereby reducing the magnetic resistance and leakage magnetic field of the magnetic circuit and increasing the magnetic flux density in the conductor plate.

[0023] This application also discloses an installation method for an eddy current damping device. The installation step of fixing the magnet to the mounting plate is carried out in the workshop or production room, forming an installation unit that is easy to transport and install. Then, it is transported to the project site and installed on the magnet back plate. Since the position of the magnet is fixed in advance, it avoids the magnet being broken or damaged during transportation and installation. At the same time, at the project site, only the installation unit needs to be installed on the magnet back plate, which is fast and has a short project cycle, which helps to shorten the construction period. In addition, the installation environment and installation convenience of the magnet are better. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the basic structure of an eddy current damping device in the prior art;

[0025] Figure 2 This is a schematic diagram of the structure of the eddy current damping device in some embodiments of the present invention;

[0026] Figure 3 This is a schematic diagram of the installation unit of the eddy current damping device in some embodiments of the present invention;

[0027] Figure 4 This is a cross-sectional view of the mounting unit of the eddy current damping device in some embodiments of the present invention (AA plane).

[0028] Figure 5 This is a plan view of the eddy current damping device after installation in some embodiments of the present invention;

[0029] Among them, 1-magnet, 11-through hole, 2-magnet back iron, 21-magnet back iron plate, 22-mounting iron plate, 221-mounting hole, 3-conductor plate, 4-conductor back iron, 5-magnetic separator, 6-countersunk screw, 7-screw. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0031] In the prior art, see Figure 1 The basic structure of the eddy current damping device includes a magnet 1, a magnet backing iron 2, a conductor plate 3, and a conductor plate 3 backing iron. The magnet 1 is directly fixed to a large magnet backing iron 2. During installation, the magnet 1 is transported to the construction site and then installed sequentially on the magnet backing iron 2. However, due to the poor installation environment at the construction site and the fragility of the magnet 1, the damage rate of the magnet 1 during installation remains high.

[0032] To address the aforementioned technical problems, this invention provides an eddy current damping device, see reference. Figure 2 Specifically, it includes: a magnet back iron 2, a magnet 1, a conductor plate 3, and a conductor back iron 4 arranged in sequence. The magnet 1 is mounted on the magnet back iron 2, and the conductor plate 3 is mounted on the conductor back iron 4. The magnet back iron 2 includes a magnet back iron plate 21 and a plurality of mounting iron plates 22 mounted on the magnet back iron plate 21. At least two evenly distributed magnets 1 are mounted on each of the mounting iron plates 22.

[0033] The magnet 1 is mounted on the mounting plate 22, which is mounted on the magnet back plate 21. The size of the mounting plate 22 is much smaller than that of the magnet back plate 21, and several mounting plates 22 can be mounted on the magnet back plate 21. This allows the eddy current damping device to be installed by first mounting the magnet 1 on the mounting plate 22 to form an installation unit, and then installing it on the magnet back plate 21. This allows the magnet 1 to be fixed into an installation unit by the mounting plate 22 in the workshop or production line, reducing installation steps on the construction site, improving installation efficiency, and shortening the construction period. At the same time, this provides structural support for the eddy current damping device to be transported and installed using installation units, thus avoiding damage to the magnet 1 during direct transport and installation.

[0034] It should be noted that the length and width of the mounting iron plate 22 are smaller than those of the magnet back iron plate 21. Multiple mounting iron plates 22 can typically be installed on each magnet back iron plate 21, and at least two evenly distributed magnets 1 can be installed on each mounting iron plate 22. When two adjacent magnets 1 are installed on the mounting iron plate 22, the magnetic poles of the two magnets 1 are opposite in direction; that is, the N pole of one adjacent magnet 1 contacts the mounting iron plate 22, and the S pole of the other adjacent magnet 1 contacts the mounting iron plate 22, meaning the polarity directions of the two adjacent magnets 1 are opposite. Simultaneously, the mounting iron plates 22 are also evenly distributed on the magnet back iron plate 21, ensuring that the magnets 1 are also evenly distributed on the magnet back iron plate 21.

[0035] In some embodiments, the magnetically conductive partition 5 is a steel plate, which serves to reduce the magnetic attraction between two adjacent damping units while also acting as a magnetic conductor.

[0036] In some embodiments, the height of the magnetically conductive partition 5 is less than or equal to the height of the magnet 1, allowing the conductor plate 3 and the conductor back iron 4 to move freely relative to the magnet 1 without affecting the installation of the conductor plate 3 and the conductor back iron 4.

[0037] In some embodiments, at least one through hole 11 is provided in the middle of the magnet 1, and a threaded hole is provided on the mounting plate 22 corresponding to the through hole 11; each magnet 1 is fixed on the mounting plate 22 by at least one countersunk screw 6, so that the magnet 1 is fixed on the mounting plate 22 to form a stable mounting unit.

[0038] Preferably, the end of the through hole 11 away from the mounting plate 22 is configured as a frustum opening larger than the head of the countersunk screw 6, so that the countersunk screw 6 does not protrude from the surface of the magnet 1 after installation, thus avoiding the countersunk screw 6 from affecting the installation of the conductor plate 3 and its relative movement with the magnet 1.

[0039] In some embodiments, at least two mounting holes 221 are symmetrically provided on the mounting iron plate 22; threaded holes are also provided on the magnet back iron plate 21 corresponding to the mounting holes 221, and the mounting iron plate 22 is fixed on the magnet back iron plate 21 by at least two screws 7.

[0040] In some embodiments, adjacent mounting plates 22 are in close contact, such that the magnets 1 are arranged in a matrix on the magnet back plate 21.

[0041] In some embodiments, the conductor plate 3 is a copper plate or an aluminum plate with high electrical conductivity.

[0042] The eddy current damping device is installed through the following steps:

[0043] See Figure 3 , Figure 4 The magnet 1 is fixed on the mounting iron plate 22 to form a mounting unit; at least two magnets 2 are evenly arranged on each mounting iron plate 22, and there is a gap between adjacent magnets 1;

[0044] The installation unit, magnet back iron plate 21, conductor plate 3, and conductor back iron 4 that make up the eddy current damping device are transported to the construction site. The magnet back iron plate 21 is installed, and the installation unit is fixed on the magnet back iron plate 21. The conductor plate 3 and conductor back iron 4 are installed so that the conductor plate cuts the magnetic field lines of the magnet when it moves relative to the installation unit.

[0045] The conductor plate 3 is installed on the side close to the magnet 1 and has a gap between it and the magnet 1, so that the conductor plate 3 can move relative to the magnet 1 under the action of external force and cut the magnetic field lines of the magnet 1.

[0046] It should be noted that during the installation process, please refer to... Figure 5 Each of the magnet back iron plates 21 is uniformly equipped with several mounting iron plates 22; at least two magnets 1 are uniformly installed on each mounting iron plate 22.

[0047] It should be noted that during the installation process, adjacent mounting plates 22 are installed in close contact with each other.

[0048] It should be noted that, during use, the mounting unit, the magnet back plate 21, the conductor plate 3, and the conductor back iron 4 constitute the basic structure of the eddy current damping device. Each pair of magnets 1 with opposite polarities forms a permanent magnet pair, serving as the magnetic field source. In use, the eddy current damping device is fixed to the main structure. When the main structure vibrates, the relative motion between the conductor plate 3 and the permanent magnet pair causes the conductor plate 3 to cut magnetic lines of force, forming eddy currents. These eddy currents interact with the permanent magnet pair, generating a Lorentz force that opposes their relative motion. The mechanical energy of the conductor plate 3 is first converted into electrical energy within the conductor plate 3, and then dissipated as heat through the resistance of the conductor plate 3, thus producing a damping effect.

[0049] It should be noted that there is a gap between the permanent magnet pair formed by the conductor plate 3 and the magnet 1; the conductor plate 3 is fixed to the main structure by the mass unit of the tuned mass damper and the conductor back iron 4 by a fixing device, and the mass unit of the tuned mass damper causes the conductor plate 3 to reciprocate relative to the fixing device by a spring or piston; thereby causing relative motion between the conductor plate 3 and the magnet 1. The fixing device can be a bearing rod and a bearing seat slidably mounted on the bearing rod, and the conductor back iron 4 is mounted on the bearing seat. The main structure can be a bridge, high-rise building, transmission tower, or other structure requiring vibration reduction. Preferably, the installation structure of the eddy current damping device when installed on the main structure can refer to the magnet and conductor installation structure disclosed in patent CN 107974928 B (patent name: universal horizontal tuned mass damper).

[0050] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An eddy current damping device, characterized in that, The device includes a magnetic steel back iron, a magnet, a conductor plate, and a conductor back iron arranged sequentially. The magnet is mounted on the magnetic steel back iron, and the conductor plate is mounted on the conductor back iron. The magnetic steel back iron includes a magnetic steel back iron plate and several mounting iron plates mounted on the magnetic steel back iron plate. At least two evenly distributed magnets are mounted on each of the mounting iron plates. The same mounting plate has at least one pair of permanent magnets, the pair of permanent magnets comprising two adjacent magnets with opposite magnetic pole directions, wherein: the N pole of one magnet faces the conductor plate and the S pole of the other magnet faces the conductor plate; The mounting iron plate and the permanent magnets thereon constitute a mounting unit; A magnetically conductive partition is provided between two adjacent magnets of the same permanent magnet pair; The mounting iron plate is provided with at least two magnetically conductive partitions, and the magnet is located between two adjacent magnetically conductive partitions, with a gap between the magnetically conductive partitions and the magnet; The magnetically conductive separator is made of steel plate; The height of the magnetically conductive partition is less than or equal to the height of the magnet. The conductor back iron, mounting iron plate, and magnet back iron plate are all made of electrical pure iron with high magnetic permeability.

2. The eddy current damping device according to claim 1, characterized in that, The magnet is fixed to the mounting plate by at least one countersunk screw.

3. The eddy current damping device according to any one of claims 1 to 2, characterized in that, The mounting plate is fixed to the magnet back plate by at least two screws.

4. The eddy current damping device according to any one of claims 1 to 2, characterized in that, The conductor plate is a copper plate or an aluminum plate.

5. The installation method of the eddy current damping device according to any one of claims 1 to 4, characterized in that, The process includes the following steps: fixing the magnets to the mounting plate to form a mounting unit; at least two magnets are evenly arranged on each mounting plate, and there is a gap between adjacent magnets; The installation unit, magnet back iron plate, conductor plate, and conductor back iron that make up the eddy current damping device are transported to the construction site. The magnet back iron plate is installed, and the installation unit is fixed on the magnet back iron plate. The conductor plate and conductor back iron are installed so that the conductor plate cuts the magnetic field lines of the magnet when it moves relative to the installation unit.

6. The installation method according to claim 5, characterized in that, Several mounting units are evenly installed on each of the magnet back plates.

7. The installation method according to claim 6, characterized in that, The adjacent mounting units are mounted close to each other.

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