CN212053302U - An eddy current inertial mass damper - Google Patents

Abstract

The utility model discloses an eddy current inertial mass damper, comprising an outer cylinder I and an outer cylinder II. The upper end of the outer cylinder I is closed and provided with a connecting ring I, and the lower end of the outer cylinder I and the upper end of the outer cylinder II are connected together by bolts. The outer cylinder I is provided with an inertial mass system, and the outer cylinder II is provided with an eddy current system I and a sliding system, the inertial mass system is connected with the eddy current system I, and the eddy current system I is connected with the sliding system. Through the ball nut connected with the sliding rod, the utility model changes the linear motion of the sliding rod into the rotary motion of the ball screw, and drives the inner drum to rotate together. At this time, the ring magnet on the inner drum passes through the inner wall of the outer fixed drum. The magnetic conductor tube cuts the magnetic field lines, and generates eddy currents in the eddy current system to achieve the effect of vibration reduction; while the inertial mass system can generate inertial mass much larger than the physical mass through rotation, which can reduce any requirements that meet the requirements. The natural frequency of the system, so as to achieve better vibration reduction effect.

Description

An eddy current inertial mass damper

technical field

The utility model relates to a damper, in particular to an eddy current inertial mass damper for disaster prevention and mitigation in civil engineering.

Background technique

The basic principle of eddy current damping is that when the magnetic conductive plate in the magnetic field cuts the magnetic field lines, an eddy current will be generated in the magnetic conductive plate, and the eddy current will generate a new magnetic field opposite to the original magnetic field, so that the original magnetic field and the conductive A damping force is formed between the magnetic plates to hinder the relative movement of the two, and the resistance effect of the magnetic conductive plates converts the kinetic energy obtained by the magnetic conductive plates into heat energy and dissipates them through eddy currents. If the magnetic conductive plate is connected to the vibration structure, the effect of structural vibration reduction and energy consumption can be produced, and it becomes an eddy current damper.

For example, the patent number is 201811249160.4, the authorization number is CN 109163047 A, and the title is "a nonlinear eddy current inertial damper and design method". etc. composition. The inertia flywheel and the ball nut are fixed as a whole, and are set on the ball screw. When the damper works, the ball screw moves in the axial direction, and the ball nut rotates, which drives the inertia flywheel and the magnet on the flywheel to rotate together. The patent number is 201810015085.9, the authorization number is CN 108331188 A, and the name is "an electromagnetic inertial mass damper", which includes a casing and a linear guide, a ball screw mechanism, a fixed seat, a speed increaser, a DC The generator is composed of a mass block, which can convert the energy generated by the vibration of the external vibration structure into the kinetic energy of the mass block and the electric energy of the DC generator and consume a large amount of energy. The patent number is 201410475528.4, the authorization number is CN 104265818 A, and the name is "an outer cup rotary axial eddy current damper", which includes a screw drive pair, a thrust bearing and a stator, a rotor and a screw drive made of magnetic conductive materials. The auxiliary nut is placed inside the stator. When the damper works, the ball screw moves in the axial direction, and the ball nut rotates, which drives the magnet on the nut to rotate together, so as to realize the characteristics of eddy current energy dissipation and vibration reduction.

From the analysis of the above literature, compared with some damping devices commonly used in the field of structural vibration control, most of the current eddy current dampers use thrust bearings. Generally, the ball screw is used for linear reciprocating motion to drive the ball nut to rotate, which in turn drives the The main part of those jobs. The eddy current damper does not rely on mechanical friction to consume energy, has no working fluid, and does not have the problem of liquid leakage and sealing, but special attention should be paid to the magnetic leakage problem.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the utility model provides an eddy current inertial mass damper with simple structure, reliable operation and wide application range.

The technical solution of the utility model to solve the above problems is: an eddy current inertial mass damper, comprising an outer cylinder I and an outer cylinder II, the upper end of the outer cylinder I is closed and provided with a connecting ring I, the lower end of the outer cylinder I and the upper end of the outer cylinder II Connected together by bolts, the outer cylinder I is provided with an inertial mass system, the outer cylinder II is equipped with an eddy current system I and a sliding system, the inertial mass system is connected with the eddy current system I, and the eddy current system I is connected with the sliding system .

In the above-mentioned eddy current inertial mass damper, the inertial mass system includes a transmission, a coupling and a flywheel, one end of the flywheel is connected to the inner ring of the ball bearing I fixed on the upper end face of the outer cylinder I, and the other end of the flywheel is connected to the transmission through the coupling. connected at one end.

In the above-mentioned eddy current inertial mass damper, the inner wall of the outer cylinder I is provided with a limiting device for fixing the position of the transmission.

In the above eddy current inertial mass damper, the flywheel is a cylinder made of metal material, and by changing the size of the flywheel, different inertial masses can be obtained to meet the requirements of inertial force damping.

In the above-mentioned eddy current inertial mass damper, the eddy current system I includes an inner drum I arranged in the outer drum II, a ring magnet I uniformly distributed on the outer wall of the inner drum I, and a corresponding annular magnet I installed on the inner wall of the outer drum II. The magnetic conducting tube I at the position of the magnet I, the upper end of the inner drum I is connected with the connector, and the connector is connected with the other end of the transmission.

In the above-mentioned eddy current inertial mass damper, an anti-foreign body core ring I is arranged between the connector and the transmission, and a ball bearing II is arranged on the outer ring of the anti-foreign body core ring I, and the ball bearing II is located at the connection between the outer cylinder I and the outer cylinder II in the bearing groove.

In the above-mentioned eddy current inertial mass damper, the sliding system includes a ball nut, a nut slider and a sliding rod, the lower part of the sliding rod protrudes from the opening of the lower end of the outer cylinder II to the outside of the outer cylinder II, and the lower end of the sliding rod is provided with a connection Ring II, there is an anti-foreign body core ring II between the lower part of the sliding rod and the opening of the lower end of the outer cylinder II, the connecting ring II and the connecting ring I are located on the same axis, the upper end of the sliding rod is provided with a ball nut, and the ball nut is installed at one end of the ball screw , the other end of the ball screw is fixedly connected with the connector, a number of nut sliders are evenly distributed around the ball nut, and the nut sliders are placed in the slider groove on the inner wall of the outer cylinder II.

In the above-mentioned eddy current inertial mass damper, a lubricating ring for lubricating the ball screw is placed on the ball nut.

The above-mentioned eddy current inertial mass damper also includes an eddy current system II, and the eddy current system II includes a magnetic tube II, an inner drum II and a ring magnet II, and the inner drum II is connected between the flywheel and the ball bearing I, One end of the inner drum II is connected with the flywheel, the other end of the inner drum II is matched with the ball bearing I, the ring magnets II are evenly distributed on the inner drum II, and the magnetic conducting tube II is installed on the inner wall of the outer drum I and is connected to the inner drum II. The position corresponding to the ring magnet II.

In the above-mentioned eddy current inertial mass damper, the ring magnet I and the ring magnet II are permanent magnets, and the magnetic tube I and the magnetic tube II are made of high magnetic permeability materials.

The beneficial effects of the present utility model are:

(1) In the sliding system of the present utility model, the linear motion of the sliding rod is converted into the rotational motion of the ball screw by the action of the ball nut and the ball screw, thereby driving the inner drum I in the eddy current system to rotate. Compared with other existing dampers of the same type, the ball screw is used to drive the eddy current system to work and rotate. Through the auxiliary orientation function of the sliding rod, it is more stable than the ball nut, and the efficiency is higher within the same working stroke. No strenuous extra movement.

(2) The ring magnet I and the ring magnet II provided by the utility model can quickly cut the magnetic field lines through their high-speed rotation. A counter torque proportional to the rotational speed is generated, which resists the vibration of the external structure.

(3) The utility model adds an inertial mass system according to functional requirements, which has a significant inertial mass effect. After the speed amplification of the transmission, the speed of the inertial mass element is greatly increased, and a small mass inertial element can be used to simulate a large inertial mass. The equivalent inertial mass is realized, which realizes the combination of inertial mass vibration damping and eddy current energy dissipation vibration damping.

(4) The utility model replaces the thrust bearing with a ball bearing, which is simple in construction and easy to maintain; the outer cylinder I and the outer cylinder II are connected by bolts, the dimensions are not affected by each other, and the installation and replacement of accessories is convenient; there is no magnetic leakage and sealing. The problem is that the temperature adaptability is good, and it meets the requirements of the actual engineering on the size limit of the damper, the change mode of the damping force inertia force, and the heat dissipation efficiency; it has a wider application range and will not cause pollution to the environment; the eddy current system of the damper and inertial mass system, do not rely on mechanical friction energy consumption, reduce the damper loss and prolong the service life of the damper; when used in building structures, the damping can be controlled by increasing or decreasing the number of ring magnets and changing the mass of the flywheel. Good vibration damping effect improves the safety of civil structures.

Description of drawings

FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

FIG. 2 is a schematic structural diagram of a ring magnet I inside the rotating drum I according to an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of Embodiment 2 of the present invention.

FIG. 4 is a schematic structural diagram of Embodiment 3 of the present invention.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Example 1

As shown in Figures 1 and 2, an eddy current inertial mass damper includes an outer cylinder I2 and an outer cylinder II6. The upper end of the outer cylinder I2 is closed and is provided with a connecting ring I1. The lower end of the outer cylinder I2 and the upper end of the outer cylinder II6 pass through bolts. 4 are connected together, the outer cylinder I2 is provided with an inertial mass system, the outer cylinder II6 is provided with an eddy current system I and a sliding system, the inertial mass system is connected with the eddy current system I, and the eddy current system I is connected with the sliding system.

The inertial mass system includes a transmission 13, a coupling 12, and a flywheel 11. One end of the flywheel 11 is connected to the inner ring of the ball bearing I10 fixed on the upper end face of the outer cylinder I2, and the other end of the flywheel 11 is connected to one end of the transmission 13 through the coupling 12. connect. The inner wall of the outer cylinder I2 is provided with a limiting device 3 for fixing the position of the transmission 13 . The flywheel 11 is a cylinder made of metal material. By changing the size of the flywheel 11, different inertial masses can be obtained to meet the requirements of inertial force damping.

The eddy current system I includes an inner drum I18 arranged in the outer drum II6, a ring magnet I17 evenly distributed on the outer wall of the inner drum I18, and a magnetic conducting tube I5 installed on the inner wall of the outer drum II6 corresponding to the position of the ring magnet I17. , the upper end of the inner drum I18 is connected to the connector 16, the connector 16 is connected to the other end of the transmission 13, an anti-foreign body core ring I15 is arranged between the connector 16 and the transmission 13, and the outer ring of the anti-foreign body core ring I15 is provided A ball bearing II14 is provided, and the ball bearing II14 is located in the bearing groove at the connection between the outer cylinder I2 and the outer cylinder II6.

The sliding system includes a ball nut 20, a nut slider 7 and a sliding rod 22. The lower part of the sliding rod 22 extends from the opening of the lower end of the outer cylinder II6 to the outside of the outer cylinder II6, and the lower end of the sliding rod 22 is provided with a connecting ring II9, The connecting ring II9 on the sliding rod 22 is used to connect one of the two points of relative vibration of the controlled structure, and the other point is connected by the connecting ring I1 on the outer cylinder I2. The connecting ring II9 and the connecting ring I1 are located on the same axis, which can reduce the whole system. The deflection of the damper makes the operation of the damper smoother; between the lower part of the sliding rod 22 and the opening of the lower end of the outer cylinder Ⅱ6 is provided with an anti-foreign body core ring Ⅱ8, the upper end of the sliding rod 22 is provided with a ball nut 20, and the ball nut 20 is installed on the ball screw 21. At one end, the other end of the ball screw 21 is fixedly connected with the connector 16 . In order to ensure that the ball nut 20 does not rotate, a number of nut sliders 7 are evenly distributed around the ball nut 20, and the nut sliders 7 are placed in the slider groove 24 on the inner wall of the outer cylinder II6. A lubricating ring 19 for lubricating the ball screw 21 is placed on the ball nut 20 .

When the sliding rod 22 moves up and down, in order to ensure that the ball nut 20 does not rotate, four nut sliders 7 are symmetrically arranged around it, and the nut sliders 7 are placed in the slider groove 24 on the inner wall of the outer cylinder II6. Because the ball nut 20 is restricted by the nut slider 7 and cannot rotate, it can only reciprocate along the axis direction. Therefore, through the ball nut 20 connected with the sliding rod 22 , the linear reciprocating motion of the sliding rod 22 can be transformed into the rotational motion of the ball screw 21 matched with the ball nut 20 . The function of the lubricating ring 19 placed on the ball nut 20 is to lubricate the rotating ball screw 21, reduce its friction, make it work more smoothly, and can drive the sleeve between the ball screw 21 and the outer cylinder II6. The rotating drum I18 rotates in the eddy current system between. At this time, the ring magnet I17 on the inner drum I18 cuts the magnetic field line through the magnetic conducting tube I5 at the corresponding position, and generates eddy current in the eddy current system to achieve the effect of vibration reduction. The ring magnets I17 evenly distributed on the inner drum are permanent magnets, and any type of strong magnets can be used, which can be arranged on the periphery of the inner drum I18 and evenly distributed; the magnetic guide tube I5 is located in the ring magnet The inner wall of the outer cylinder II6 at the corresponding position of I17 can generally be made of high magnetic permeability material.

The rotating ball screw 21 also drives the anti-foreign body core ring I15 connected to it through the connector 16, and is supported by a ball bearing II14 on its periphery. The ball bearing II14 is located in the bearing groove of the connecting part of the outer cylinder I2 and the outer cylinder II6; at this time, the anti-foreign body core ring I15 not only plays the role of connection, but also plays the role of support and retention; the outer cylinder I2 and the outer cylinder II6 are composed of Made of metal material, connected with 4 bolts. The anti-foreign body core ring I15 drives the transmission 13 in the inertial mass system, and the transmission 13 drives the flywheel 11 to rotate together through the coupling 12; the limiting device 3 is located on the inner wall of the outer cylinder I2 to fix the position of the transmission 13, which can reduce the The deflection of the system keeps the damper running smoothly. When the ball screw 21 rotates, it drives the anti-foreign body core ring I15 to rotate together, and the speed is converted and transmitted to the flywheel 11 through the transmission 13 . One end of the flywheel 11 is connected with the transmission 13 through the coupling 12 to obtain the rotational speed; the other end is matched with the ball bearing I10 on the outer cylinder I2. The flywheel 11 is a cylinder made of metal material. By changing the size of the flywheel 11, different inertial masses can be obtained to meet the requirements of inertial force damping.

When the vibration acts on the main structure, the excitation energy is redistributed between the main structure and the eddy current inertial mass damper, and part of the vibration energy of the main structure is transferred to the eddy current system, which is converted into heat energy and dissipated through the eddy current, reducing the main structure. The other part of the energy is transferred to the inertial mass system, and the inertial mass will generate a corresponding inertial force, thereby attenuating the vibration response.

Embodiment 2

As shown in Fig. 3, on the basis of the first embodiment, the eddy current system I is removed, and the eddy current system II is set up. The eddy current system II includes a magnetic tube II25, an inner drum II23 and a ring magnet II26. The inner drum II23 is connected between the flywheel 11 and the ball bearing I10, one end of the inner drum II23 is connected with the flywheel 11, the other end of the inner drum II23 is matched with the ball bearing I10, the ring magnet II26 is evenly distributed on the inner drum II23, so The magnetic conducting tube II25 is installed on the inner wall of the outer cylinder I2 at a position corresponding to the ring magnet II26. The ring magnet II 26 adopts a permanent magnet, and the magnetic conducting tube II 25 is made of a high magnetic permeability material.

With this structural arrangement, the eddy current system of the damper will be connected behind the inertial mass, that is to say, the inner drum II 23 can obtain a larger rotational speed through the transmission 13 . At this time, the magnetic tube II25 in the magnetic field can cut the magnetic field lines more quickly, generating eddy currents, and the eddy currents will generate a new magnetic field in the opposite direction to the original magnetic field more quickly, so that the original magnetic field and the magnetic permeability are more quickly generated. A damping force is formed between the tubes II 25 to hinder the relative movement of the two, and the resistance effect of the magnetic tube II 25 converts the kinetic energy obtained by the magnetic tube II 25 into heat energy and dissipates it through eddy current.

Embodiment 3

As shown in FIG. 4 , the third embodiment is actually a combination of the first embodiment and the second embodiment, that is, the eddy current system I and the eddy current system II are set at the same time.

When this embodiment is adopted, the damper can achieve a larger damping force and damping coefficient, so as to obtain a better shock absorption effect. During the installation and use of the damper, attention should be paid to the installation of the limiting device 3 and the anti-foreign body core ring I15 to assist in supporting the damper and ensure its smooth operation.

Claims (10)

1. An eddy current inertial mass damper, characterized in that: including urceolus I, urceolus II, I upper end of urceolus seals and is equipped with go-between I, and I lower extreme of urceolus and II upper ends of urceolus pass through bolted connection together, be equipped with inertial mass system in the urceolus I, be equipped with I, the sliding system of electric eddy current system in the urceolus II, inertial mass system is connected with I, I and the sliding system of electric eddy current system are connected.

2. The eddy current inertial mass damper according to claim 1, characterized in that: the inertia mass system comprises a speed changer, a coupler and a flywheel, wherein one end of the flywheel is connected with an inner ring I of a ball bearing fixed on the upper end surface of the outer barrel, and the other end of the flywheel is connected with one end of the speed changer through the coupler.

3. The eddy current inertial mass damper according to claim 1, characterized in that: and a limiting device for fixing the position of the transmission is arranged on the inner wall of the outer barrel I.

4. The eddy current inertial mass damper according to claim 2, characterized in that: the flywheel is a cylinder made of metal materials, and different inertial masses can be obtained by changing the size of the flywheel so as to meet the requirement of damping of inertial force.

5. The eddy current inertial mass damper according to claim 2, characterized in that: the eddy current system I comprises an inner rotary drum I arranged in an outer drum II, annular magnets I evenly distributed on the outer wall of the inner rotary drum I, and a magnetic conduction pipe I arranged on the inner wall of the outer drum II and corresponding to the positions of the annular magnets I, wherein the upper end of the inner rotary drum I is connected with a connector, and the connector is connected with the other end of the transmission.

6. The eddy current inertial mass damper according to claim 5, characterized in that: be equipped with between connector and the derailleur and prevent foreign matter core circle I, prevent setting up ball bearing II on the I outer lane of foreign matter core circle, ball bearing II is in the bearing groove of urceolus I and II junctions of urceolus.

7. The eddy current inertial mass damper according to claim 6, characterized in that: the sliding system comprises a ball nut, nut sliders and a sliding rod, the lower portion of the sliding rod extends out of an opening at the lower end of the outer barrel II to the outside of the outer barrel II, a connecting ring II is arranged at the lower end of the sliding rod, a foreign matter preventing core ring II is arranged between the lower portion of the sliding rod and the opening at the lower end of the outer barrel II, the connecting ring II and the connecting ring I are located on the same axis, the ball nut is arranged at the upper end of the sliding rod, the ball nut is installed at one end of the ball screw, the other end of the ball screw is fixedly connected with a connector, the nut sliders are evenly distributed on the periphery of the.

8. The eddy current inertial mass damper according to claim 7, characterized in that: and a lubricating ring for lubricating the ball screw is arranged on the ball nut.

9. The eddy current inertial mass damper according to claim 7, characterized in that: still include eddy current system II, eddy current system II includes magnetic conduction pipe II, adversion section of thick bamboo II and annular magnet II, interior rotary drum II is connected between flywheel and ball bearing I, and II one end of adversion section of thick bamboo are connected with the flywheel, and II other ends of adversion section of thick bamboo cooperate with ball bearing I, II equipartitions of annular magnet are on interior rotary drum II, magnetic conduction pipe II installs on I inner wall of urceolus and the position department that annular magnet II correspond.

10. The eddy current inertial mass damper according to claim 9, characterized in that: the annular magnet I and the annular magnet II are permanent magnets, and the magnetic conduction pipe I and the magnetic conduction pipe II are made of high-magnetic-conduction materials.

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