JPH01216138A - Magnetic adjusting type vibration suppressing device - Google Patents

Abstract

PURPOSE:To freely adjust the magnitude of magnetic resistance by arranging a rotary electric conductive body between a pair of opposed magnetic plates and arranging a plurality of positive and negative electrodes at an equal angles on the circumference of the both magnetic plates. CONSTITUTION:A plurality of positive and negative electrodes N and S are arranged alternately at an equal angles on the circumference of a pair of magnets 9 and 9, and fixed onto the opposed surfaces of a core 2 and an adjusting plate 7. A rotary plate 10 is inserted between the both magnet plates 9 and 9, keeping each gap on the both sides, and fixed onto a solid shaft 5b. The cover 2 is fixed onto a structure, and a handle 3a is connected with a piping. When the piping vibrates, an inner pipe 3 moves in and out, and a center shaft 5 is turned in reciprocation, and the vibration is damped by the combination of the magnetic resistance due to the magnetic plates 9 and 9 or the inertia resistance of the rotary plate 10. In this case. if the turn of one of the magnetic plates is adjusted, the path of the line of the magnetic forces which passes through an electric conductive rotary plate 10 is inclined, and the length is increased or decreased. As the length of the path increases longer, the vibration suppressing torque increases more.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used to support piping in power plants, plants, etc., and does not restrain slow displacement due to temperature changes, but damps sudden vibrations due to earthquakes and other causes. [Conventional technology and problems] A snubber that uses both inertial resistance and magnetic resistance was developed in 1986-2.
It is known as 0870. A magnet is placed on the outer surface of a rotating plate that is forced to rotate back and forth, and the eddy current generated in the rotating plate acts as a damper. However, since this structure lacks a means to freely adjust the eddy current, it has the drawback that an appropriate vibration damping effect cannot necessarily be expected.

[Means for solving the problem] The problem cannot be solved with a structure in which one magnet and one electric conductor correspond to each other. In the present invention, a rotating electric conductor is arranged between a pair of opposing magnetic stone plates, and both magnetic plates are arranged in a circle. Positive and negative electrodes were arranged at multiple equal angles on the circumference.

When one of the magnet plates is rotated and adjusted, the path of the lines of magnetic force passing through the conductor is inclined and its length increases or decreases.The damping torque increases as the path length increases.

In this structure, the principle of operation differs depending on the quality of the conductor inserted between the two poles. When the conductor is a so-called paramagnetic material such as aluminum or copper, the damping torque due to eddy current increases as the rotation speed of the conductor increases. That is, it is suitable for damping high frequency vibrations. When the conductor is a so-called ferromagnetic material such as iron or nickel, the vibration damping torque is affected by the size of the area surrounded by the so-called hysteresis curve, and has nothing to do with the rotation speed of the conductor. That is, in the case of ferromagnetic materials, it is also effective in damping low frequency vibrations.

In either case, if the magnetic plate on one side is rotated and the lines of magnetic force are extended at an angle, the damping torque increases accordingly.

The choice of conductor is determined by considering the target frequency range to be damped, but if the number of magnetic plates is increased and the two types of conductors mentioned above are incorporated, a wide range of frequencies can be supported. is possible.

[Implementation f? IJ] The drawings will be explained. The outer part f11 connects the large diameter part 1b and the small diameter part IC via the partition wall 1a, and the lid 2 is fixed to the large diameter part. The inner cylinder 3 is inserted oppositely into the small diameter portion 1c so as to be freely removable and removable, has a pole nut 4 at its inner end, and has a handle 3a at its outer end. The center shaft 5 has a bearing B in the center.
1 is pivotally supported on the partition wall 1a, and one side of the 1 serves as a screw shaft 5a, which is screwed into the holener soto 4. The other side is a solid shaft 5b, and the end is supported by the lid 2 with a bearing B2.

The positioning tube 6 is fixed concentrically to the inner surface of the lid 2. The adjustment plate 7 is supported by the solid shaft 5b by a bearing B3 and comes into contact with the positioning cylinder 6. The screw 8 is threaded into the positioning tube 6 in the radial direction, and its tip engages with the adjustment plate 7 to restrict rotation of the adjustment plate.

A pair of magnet plates 9.9 have positive and negative poles N and S arranged alternately at equal angles on the circumference, and are fixed to the facing surfaces of the lid 2 and the adjustment plate 7. The rotary plate 10 is inserted between both magnet plates with gaps left on both sides, and is fixed to the solid shaft 5b. Rotating plate 1
0 may be configured to have an appropriate weight.

The present invention is constructed as described above, and is used by fixing the lid 2 to a structure and connecting the handle 3a to a pipe.

Due to the vibration of the piping, the inner tube 3 moves in and out, causing the central shaft 5 to rotate reciprocatingly, and the vibrations are suppressed by the combination of the magnetic resistance of the magnet plate or the inertial resistance of the rotary plate. Displacement of the piping due to temperature changes will not result in spinning because the operation is slow.Since the large diameter part of the outer cylinder is provided with a working window 1d, the engagement between the adjustment plate 7 and the screw 8 is cut off, and the adjustment plate can be rotated to a desired angle and then re-engaged.

FIG. 3 shows another embodiment in which another magnet plate 11 is inserted between a pair of magnet plates 9 and 9, and the position is adjusted so that the rotation can be adjusted using a screw 12. It is fixed to the solid shaft 5b by being locked to the solid shaft 5b by inserting rotary plates 13 and 14 on both sides thereof. As mentioned above, if one of the two rotating plates is made of paramagnetic material and the other is made of ferromagnetic material, a wide range of vibration frequencies can be accommodated.

[Effect] By simultaneously generating magnetic resistance or inertial resistance by the rotary plate, and making it possible to freely adjust the magnitude of the magnetic resistance, it is possible to precisely respond to the target frequency range.

[Brief explanation of the drawing]

FIG. 1 is a front view of the present invention, FIG. 2 is a plan view of a magnet plate, and FIG. 3 is a front view of another embodiment. 1... Outer cylinder, 2... Lid, 3... Inner cylinder, 4...
Pole nut, 5...center shaft, 5a...screw shaft, 5
b...Solid shaft, 6...-positioning cylinder, 7...adjustment plate, 8...screw, 9...magnetic plate, 10...rotating plate,
11... Magnet plate, 12... Screw, 13.14...
Rotating plate. Patent applicant Sanwa Detsuki Co., Ltd.

Claims (3)

[Claims] (1) An outer cylinder which connects a large diameter part and a small diameter part through a central partition and has a lid at the outer end of the large diameter part, and which is inserted oppositely into the small diameter part so as to be able to go in and out, and has a nut on the inner end and a handle on the outer end. an inner cylinder, which is rotatably supported in the central part on the central partition wall, and has one side formed as a screw shaft screwed into the nut and the other side formed as a solid shaft; A positioning cylinder fixed concentrically, an adjustment plate locked to the positioning cylinder so as to be able to move on the solid shaft, and an adjustment plate fixed to the facing surface of the outer cylinder lid and the adjustment plate alternately at multiple equal angles on the circumference. A magnetic adjustment vibration damping device comprising a pair of magnet plates having positive and negative poles disposed on the sides thereof, and a rotary plate fixed to the solid shaft with gaps left on both sides between the two magnet plates. (2) The magnetic adjustment vibration damping device according to claim (1), wherein there are two rotary plates fixed to a solid shaft, and a magnet plate inserted between both rotary plates with a gap on both sides is locked to the positioning cylinder. (3) The magnetic adjustment damping device according to claim (2), wherein one of the two rotary plates fixed to the solid shaft is made of a paramagnetic material, and the other is made of a ferromagnetic material.