Dual mechanism heat dissipation type rotary eddy current damper

Abstract

The utility model relates to the field of building structure vibration control especially relates to a double mechanism heat dissipation formula rotary electric eddy current damper. In view of the defect that the existing electric eddy current damper causes the damping force attenuation due to the resistance increase caused by conductor temperature rise, and the high temperature demagnetization of permanent magnet, the utility model puts forward the double mechanism heat dissipation scheme. Including the coaxial assembly structure (the rotating cylinder can be located inside or outside the fixed cylinder) of rotating cylinder and fixed cylinder, the ball screw - nut pair converts the external linear vibration into rotary motion;The fan blade servo rotation installed in the rotating cylinder, drive gas to flow through the vent hole and annular gap set up in the outer cylinder, form bidirectional forced air cooling channel;At the same time, the conductor ring and the mounting matrix fill the heat conduction paste layer to strengthen the interface heat conduction. The double mechanism synergistic effect significantly inhibits the temperature rise of permanent magnet and conductor ring, and guarantees the stable output of damping force. Its advantage lies in: breaking through the reciprocating motion heat dissipation bottleneck;Double assembly structure improves spatial adaptability;Maintenance free no oil leakage risk.

Description

Technical Field

[0001] This utility model relates to the field of building structure vibration control, and in particular to a dual-mechanism heat dissipation rotating eddy current damper. Background Technology

[0002] In the field of building structure vibration control, traditional viscous dampers have long faced the inherent problem of fluid seal failure. Their hydraulic medium is prone to leakage under repeated loading, leading not only to damping performance degradation and increased maintenance costs, but also to environmental pollution risks. To overcome this bottleneck, rotating eddy current dampers have emerged as an ideal alternative due to their contactless energy dissipation mechanism: through the relative rotational motion of a permanent magnet and a conductor ring (such as a copper ring), eddy currents are induced within the conductor, converting mechanical energy into heat energy, achieving maintenance-free, high-response damping force output.

[0003] However, this technology has revealed a core flaw in practical engineering: thermally induced performance degradation. On one hand, the conductor ring (usually copper) generates significant Joule heating due to the eddy current effect during continuous operation, causing a rapid temperature increase. The resistivity of copper increases significantly with temperature (+0.4% / ℃), according to the eddy current intensity formula I... eddy ∝1 / R and the relationship between damping force F d ∝I eddy Increased conductor resistance directly leads to a decrease in damping force. On the other hand, existing heat dissipation designs are inefficient (relying on natural convection and limited heat conduction), causing heat to accumulate in the permanent magnet region, triggering a more serious secondary crisis: permanent magnets such as neodymium iron boron undergo irreversible magnetic property decay at high temperatures (e.g., remanence B). r (The temperature decreases by 0.1–0.15% per °C), and the weakening of the magnetic field further inhibits the generation of eddy currents, forming a vicious cycle of "temperature rise → increased resistance → weakened magnetic field → reduced damping".

[0004] The dual thermal decay effect (a sharp increase in conductor resistance + demagnetization of permanent magnets) prevents dampers from maintaining their design performance in long-term vibration control tasks (such as wind-induced vibration suppression and seismic response). Current technologies struggle to overcome the heat dissipation bottleneck: natural convection cooling is insufficient, while forced air cooling lacks integration with rotating components; simultaneously, the interfacial thermal resistance between the conductor ring and the mounting base further hinders heat dissipation. If this problem is not addressed, the reliability and long lifespan advantages of eddy current dampers will be completely undermined, severely restricting their widespread adoption in major engineering projects. Utility Model Content

[0005] The purpose of this invention is to solve the problems in the prior art and provide a dual-mechanism heat dissipation rotating eddy current damper.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a dual-mechanism heat dissipation type rotating eddy current damper, comprising a rotating cylinder, a fixed cylinder, a ball screw, a ball nut, a conductor ring, a permanent magnet, a fan blade, a first bearing, a second bearing, a first connecting part, a second connecting part, and a thermal grease layer.

[0007] Furthermore, the rotating cylinder can be coaxially mounted on the outside or inside of the fixed cylinder;

[0008] Furthermore, the ball screw passes through the ball nut to form a transmission pair and extends axially into the internal space of the rotating cylinder or the fixed cylinder located on the inner side;

[0009] The rotating cylinder is fixedly connected to the ball nut;

[0010] One side of the first bearing is installed to one end of the fixed cylinder, and the other side is installed to one end of the rotating cylinder;

[0011] The second bearing is installed on one side to the other end of the fixed cylinder, and on the other side to the ball nut side;

[0012] Furthermore, the fan blades are circumferentially and evenly mounted on the radial side of the rotating cylinder, and are opposite to the fixed cylinder;

[0013] Furthermore, the conductor ring is mounted on the radially inner surface of the rotating cylinder or the fixed cylinder located on the outer side, and the permanent magnet is mounted on the radially outer surface of the rotating cylinder or the fixed cylinder located on the inner side.

[0014] Furthermore, a first vent hole and a second vent hole are respectively provided on both sides of the rotating cylinder or the fixed cylinder located on the outer side;

[0015] Furthermore, the first connecting part is fixedly connected to one end of the fixed cylinder, and the second connecting part is fixedly connected to one end of the ball screw.

[0016] Preferably, the conductor ring and the permanent magnet are symmetrically distributed on both sides of the fan blade along the axis.

[0017] Preferably, the first vent and the second vent are evenly distributed circumferentially.

[0018] Preferably, the axes of the first and second vent holes are inclined relative to the cylinder wall.

[0019] Preferably, the thermally conductive paste layer is filled between the contact surface of the conductor ring and the outer rotating cylinder or the fixed cylinder.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. This utility model uses a dual mechanism of bidirectional forced air cooling and thermal paste to enhance interfacial heat transfer to effectively suppress the temperature rise of the damper during operation, prevent heat accumulation in the permanent magnet area, ensure the stability of the magnetic properties of the permanent magnet, and thus maintain the reliable output of the damping force.

[0022] 2. The relative positions of the rotating cylinder and the fixed cylinder are not fixed. The assembly method of placing the rotating cylinder inside or outside the fixed cylinder can be freely selected according to the actual installation requirements, which greatly enhances the adaptability of the damper to different installation spaces and structural layouts.

[0023] 3. No hydraulic medium or sealing structure is required, which completely solves the oil leakage risk of traditional viscous dampers, realizes maintenance-free operation, and improves the reliability of the system in long-term operation. Attached Figure Description

[0024] Figure 1 This is a front view of the rotating cylinder of this utility model located inside the fixed cylinder;

[0025] Figure 2 This is a front view of the present invention with the rotating cylinder located outside the fixed cylinder;

[0026] Figure 3 This is a schematic diagram of the bidirectional air-cooled fan heat channel of this utility model;

[0027] Figure 4 This is a schematic diagram of the heat conduction path of the conductor ring of this utility model.

[0028] In the figure: 1. Rotating cylinder; 2. Fixed cylinder; 3. Ball screw; 4. Ball nut; 5. Conductor ring; 6. Permanent magnet; 7. Fan blade; 8. First bearing; 9. Second bearing; 10. First connecting part; 11. Second connecting part; 12. First vent hole; 13. Second vent hole; 14. Thermal paste layer. Detailed Implementation

[0029] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0030] Example: Figure 1-4 As shown, a dual-mechanism heat dissipation rotating eddy current damper includes a rotating cylinder, a fixed cylinder, a ball screw, a ball nut, a conductor ring, a permanent magnet, a fan blade, a first bearing, a second bearing, a first connecting part, a second connecting part, and a thermal grease layer.

[0031] The rotating cylinder can be coaxially installed on the outside or inside of the fixed cylinder. Of the rotating cylinder and the fixed cylinder, the one installed on the outside is the outer cylinder, and the one installed on the inside is the inner cylinder.

[0032] One end of the ball screw passes through the ball nut to form a transmission pair and extends axially into the internal space of the inner cylinder;

[0033] The rotating cylinder is fixedly connected to the ball nut;

[0034] The left end of the fixed cylinder supports the rotating cylinder via a first bearing, and the right end of the fixed cylinder supports the ball nut via a second bearing.

[0035] The fan blades are circumferentially and evenly mounted on the radial side of the rotating cylinder, and are opposite to the fixed cylinder;

[0036] The conductor ring is installed on the radial inner surface of the outer cylinder, and the contact surface between the two is filled with a thermally conductive paste layer to reduce the microscopic air gap between the contact surfaces and improve heat dissipation efficiency; the permanent magnet is installed on the radial outer surface of the inner cylinder.

[0037] The outer cylinder has a first vent hole and a second vent hole evenly arranged circumferentially on both sides, and the axis of the vent hole is inclined relative to the cylinder wall to facilitate airflow. The first vent hole, the axial annular gap between the rotating cylinder and the fixed cylinder, the fan blades, and the second vent hole form a heat dissipation air duct.

[0038] The first connecting part is fixedly connected to one end of the fixed cylinder, and the second connecting part is fixedly connected to one end of the ball screw.

[0039] The conductor ring and the permanent magnet are symmetrically distributed on both sides of the fan blade along the axis.

[0040] The working principle of this invention is as follows: When external reciprocating linear vibration drives the ball screw and ball nut to move relative to each other through the first and second connecting parts, the ball nut drives the rotating cylinder to rotate periodically in both directions. This rotational motion causes the conductor ring and the permanent magnet to rotate relative to each other, generating eddy currents and damping forces in the conductor ring. The synchronously rotating fan blades drive the gas to flow through the annular gap between the first and second vents during both forward and reverse rotations, forming a bidirectional forced convection airflow channel that continuously carries heat away from the permanent magnet and conductor ring area. At the same time, the thermal grease layer significantly reduces the interfacial thermal resistance between the conductor ring and the mounting base, accelerating the conduction of heat to the outer wall of the outer cylinder. Through the synergistic mechanism of bidirectional forced air cooling and enhanced interfacial thermal conductivity, dynamic suppression of temperature rise in the core components is achieved.

[0041] The above content is a further detailed description of the technical solution provided in conjunction with the preferred embodiments of this patent. It should not be considered that the specific implementation of this utility model is limited to the above description. For those skilled in the art to which this patent pertains, several simple deductions or substitutions can be made without departing from the concept of this patent, and all of these should be considered to fall within the protection scope of this patent.

Claims

1. A dual-mechanism heat dissipation rotating eddy current damper, characterized in that: Includes a rotating cylinder, a fixed cylinder, a ball screw, a ball nut, a conductor ring, a permanent magnet, fan blades, a first bearing, a second bearing, a first connecting part, a second connecting part, and a thermal grease layer; The rotating cylinder can be coaxially installed on the outside or inside of the fixed cylinder; The ball screw passes through the ball nut to form a transmission pair and extends axially into the internal space of the rotating cylinder or the fixed cylinder located on the inner side; The rotating cylinder is fixedly connected to the ball nut; One side of the first bearing is installed to one end of the fixed cylinder, and the other side is installed to one end of the rotating cylinder; The second bearing is installed on one side to the other end of the fixed cylinder, and on the other side to the ball nut side; The fan blades are circumferentially and evenly mounted on the radial side of the rotating cylinder, and are opposite to the fixed cylinder; The conductor ring is mounted on the radially inner surface of the rotating cylinder or the fixed cylinder located on the outer side, and the permanent magnet is mounted on the radially outer surface of the rotating cylinder or the fixed cylinder located on the inner side. A first vent hole and a second vent hole are respectively provided on both sides of the rotating cylinder or the fixed cylinder located on the outer side; The first connecting part is fixedly connected to one end of the fixed cylinder, and the second connecting part is fixedly connected to one end of the ball screw.

2. The dual-mechanism heat dissipation rotating eddy current damper according to claim 1, characterized in that: The conductor ring and the permanent magnet are symmetrically distributed on both sides of the fan blade along the axis.

3. The dual-mechanism heat dissipation rotating eddy current damper according to claim 1, characterized in that: The first and second vents are evenly distributed circumferentially.

4. The dual-mechanism heat dissipation rotating eddy current damper according to claim 1, characterized in that: The axes of the first and second vent holes are inclined relative to the cylinder wall.

5. A dual-mechanism heat dissipation rotating eddy current damper according to claim 1, characterized in that: The thermally conductive paste layer is filled between the contact surface of the conductor ring and the outer rotating cylinder or the fixed cylinder.

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