JPS6049244B2 - Magnetic response element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-purpose vibration-sensing element that displaces a magnetic sphere held under a magnetic balance by rocking, magnetic force, or external mechanical pushing-up action. .

The applicant has already held a magnetic sphere inside a cylindrical magnet in such a way that it is balanced by its own weight and the magnetic force action at the upper and lower ends of the cylindrical magnet, and the applicant holds the magnetic sphere inside a cylindrical magnet so as to be balanced by its own weight and the magnetic force action at the upper and lower ends of the cylindrical magnet. A vibration-sensing element in which the magnetic force of the magnetic sphere becomes unbalanced, and the magnetic force at the upper end of the cylindrical magnet acts strongly to move the magnetic sphere upward, and this vibration-sensing element We have developed a seismic valve device that uses the displacement of a magnetic sphere to close the valve.

However, in this type of vibration-sensing element, although it is most preferable for the magnetic sphere displaced within the cylindrical magnet to be a sphere in terms of its operation, it has the disadvantage that its operational characteristics gradually change as it becomes magnetized over time.

In addition, cylindrical magnets also exhibit a demagnetizing effect when the external temperature is high, and on the other hand, exhibit a magnetizing effect when the external temperature is low, so the magnetic flux distribution on the magnetic sphere also acts and the magnetic sphere becomes It has the disadvantage that it causes irregular operations such as rolling, resulting in extremely large variations in operating characteristics. In addition, the magnetic sphere frequently comes into contact with the magnet due to turbulence, which causes deterioration of the magnet and rapid magnetization of the magnetic sphere, which adversely affects the operating characteristics. Therefore, for example, when constructing a control element that senses minute changes in fluid pressure and performs various mechanical displacement operations using a seismic sensing element having the above-mentioned configuration, a highly reliable vibration sensing element can be used. It becomes difficult to obtain things.

Therefore, as a result of extensive research, the inventor provided a cylindrical body made of non-magnetic material, arranged annular magnets of the same configuration with the same poles facing each other at the upper and lower open ends of this cylindrical body, and created an upper annular magnet. A yoke is disposed on the upper or lower surface of the upper and lower annular magnets to optimize the magnetic flux distribution for the magnetic sphere housed inside the cylinder, and the lower annular magnet has a spherical seat in its hollow or upper side. A member is provided to hold the magnetic sphere on the spherical seat in a balance between its own weight and magnetic force, and a non-magnetic guide plate is interposed between the upper end of the cylinder and the upper annular magnet to guide the sphere. on the board.

By drilling a guide hole for the magnetic sphere, it is possible to prevent collision with the annular magnet when the magnetic sphere moves upward based on external vibration, and to function as a magnetically responsive element that always has stable operating characteristics. I found out. In particular, by arranging a yoke on the upper surface of the annular magnet disposed at the lower end of the cylindrical body, the magnetic flux distribution for the magnetic sphere held on the spherical seat can prevent the magnetic sphere from operating erratically. This was found to be the most appropriate condition.

4 In addition, by configuring the holding member that holds the magnetic sphere to be slidable on a horizontal surface,
It has also been found that the magnetic sphere can be made to respond selectively to specific vibration frequencies. In addition, in order to more effectively prevent disturbances caused by rolling of the magnetic sphere, it is possible to drill a center hole in the holding member, insert a non-magnetic rod-shaped object into the center hole, and fix it to the magnetic sphere. It was found to be suitable.

Therefore, the general object of the present invention is to dispose a magnetic sphere inside a cylindrical body on which a magnetic field from a magnet acts, and to displace the magnetic sphere held in balance with its own weight and magnetic force in response to external vibrations. It is an object of the present invention to provide a magnetically responsive element which can prevent the erratic operation of the magnetic sphere, prevent deterioration of the magnet and magnetization of the magnetic sphere, and always have stable operating characteristics.

Therefore, the main object of the present invention is to arrange annular magnets symmetrically and with the same polarity in the upper and lower parts of a non-magnetic cylindrical body, and to arrange the annular magnets on the upper surface of the upper annular magnet and on the upper surface or lower surface of the lower annular magnet, respectively. A yoke is arranged, a holding member having a spherical seat is provided in the hollow or upper part of the lower annular magnet, and the magnetic sphere is held on the spherical seat in a balance between its own weight and magnetic force, and the upper end of the cylindrical body is To provide a magnetically responsive element characterized in that a non-magnetic guide plate is interposed between the upper annular magnet and the upper annular magnet, and a guide hole for a magnetic sphere is bored in the guide plate.

In the magnetically responsive element described above, a yoke is arranged between the lower end of the non-magnetic cylindrical body and the lower annular magnet, and a holding member for holding the magnetic sphere is fixedly or slidably arranged on the center of the yoke. I can do that.

As an alternative, a yoke is disposed on the lower surface of the lower annular magnet, a pedestal is fitted into the hollow part of the lower annular magnet, and a spherical seat is fixed or slidably disposed on this pedestal to hold the magnetic sphere. It can also be configured.

In addition, in the above-mentioned magnetic force responsive element, by drilling a through hole in the center of the holding member and inserting a non-magnetic rod-shaped body into this through hole and fixing it to the magnetic body, the rolling of the magnetic sphere can be prevented. It is possible to reliably prevent such disturbances.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the magnetically responsive element according to the present invention will be described in detail below with reference to the accompanying drawings with examples thereof.

In FIG. 1, reference numeral 10 indicates a cylindrical body made of a non-magnetic material, and annular magnets 12 and 14 of the same size are attached to the upper and lower open ends of this cylindrical body 10, respectively, with the same polarity (for example, S
The magnetic spheres 16 are arranged symmetrically with the poles (poles and south poles) facing each other, and the magnetic spheres 16 are housed inside the cylindrical body 10. In this case, the inner diameter φ1 of the annular magnets 12 and 14 is set to be slightly smaller than the inner diameter φ2 of the cylindrical body 10. The magnetic sphere guide hole 18 has a diameter larger than the diameter φ3 of
A guide plate 20 having a hole therein is inserted, and the cylindrical body 10, the upper annular magnet 12, and the guide plate 20 are shelved and fixed at their joint surfaces, respectively. Further, the upper surface of the upper annular magnet 12 and the upper surface of the lower annular magnet 14 are provided with a cylindrical body 10 to prevent leakage magnetic flux.
Coupling yokes 22 and 24 are provided in order to optimize the magnetic flux distribution inside the yoke.

Note that the yoke 24 can also be attached to the lower surface of the lower annular magnet 14. However, the magnetic sphere 16 is provided with an appropriate holding member so as to maintain a centripetal action on the axis due to the magnetic force of the annular magnets 12 and 14 at a substantially middle portion of the cylindrical body 10 and to remain stationary due to magnetic force balance. Hold.

Therefore, in this embodiment, a spherical seat 26 as a holding member made of a non-magnetic material is arranged above the yoke 24 arranged on the upper surface of the lower annular magnet 24. In this case, sphere 2
6 can be fixedly or slidably arranged on the yoke 24. That is, when the ball seat 26 is fixedly arranged with respect to the yoke 24, as shown in FIG. 2, the response characteristics of the magnetic sphere to external vibration vary from low frequency vibration to high frequency vibration, as shown in characteristic curve A. It becomes a nearly constant state. In addition, when the ball seat 26 is arranged to be slidable with respect to the yoke 24, the response characteristics of the magnetic sphere to external vibrations are as shown in characteristic curve B to specific low frequency vibrations (for example, 1 to 7 Hz). This makes it possible to respond selectively. Therefore, the latter method has the advantage that it can be suitably applied as a vibration-sensing element, especially for earthquakes and the like. According to the magnetic force-responsive element of this embodiment configured in this way, the magnetic sphere 16 can be easily held on the sphere seat 26 by the balance between its own weight and the magnetic force, and the magnetic flux distribution with respect to the magnetic sphere 16 is The magnetic sphere 16 is properly held so as to exert a centripetal action on the central axis of the cylindrical body 10.

Therefore, when vibration is applied to the cylindrical body 10, the magnetic sphere 16 undergoes natural vibration on the spherical seat 26, and as a result, the upper and lower magnetic forces on the magnetic sphere 16 are unbalanced (the magnetic force from the upper part acts strongly on the magnetic sphere). ), and the magnetic sphere 16 moves upward substantially vertically without rolling. In addition, by providing the guide plate 20 with the guide hole 18 between the upper end of the cylindrical body 10 and the upper annular magnet 12, contact with the annular magnet 12 is prevented when the magnetic sphere 16 moves upward. As a result, damage to or demagnetization of the annular magnet can be prevented, and magnetization of the magnetic sphere can also be prevented, making it possible to always maintain the response characteristics of the element at constant M. FIG. 3 shows another embodiment of the magnetically responsive element according to the present invention, and the external structure of the element is substantially the same as the embodiment shown in FIG.

In this embodiment, a yoke 24 is disposed on the lower surface of the lower annular magnet 14, and the yokes 22 and 24 are preferably annular yokes having a center hole. However,
In this embodiment, a pedestal 28 is fitted into the hollow part of the lower annular magnet 14, and an annular spherical seat 30 as a holding member made of a non-magnetic material is disposed above the pedestal 28. A tapered through hole 32 is bored in the center of the holding member, and a rod 34 made of a non-magnetic material is inserted into the through hole of the holding member thus provided.
One end of the magnetic sphere 4 is fixed to the magnetic sphere 16. In this embodiment as well, the ball seat 30 can be fixedly or slidably arranged on the pedestal 28, and when the ball seat 30 is slidably arranged on the pedestal 28, the pedestal 2
It is also possible to interpose a perforated sliding plate 36 on top of the slide plate 8.

Therefore, when the ball seat 30 is fixedly or slidably arranged, the characteristics of the element shown in FIG. 2 are obtained as in the embodiment shown in FIG. 1. In addition, in this embodiment, the lower annular 7
The yoke 24 can be attached to the magnet 14 by placing it on the upper surface of the lower annular magnet 14, similar to the embodiment shown in FIG. According to the magnetically responsive element of this embodiment configured as described above, when vibration is applied to the cylindrical body 10 in the same manner as in the above-mentioned embodiment, the magnetic sphere 16 undergoes natural vibration on the spherical seat 30 and the rod-shaped body 34 is vibrated. It also moves upward almost vertically.

That is, in this embodiment, the rod-shaped body 3
4 can easily swing in the radial direction using the smallest diameter part of the through hole 32 as a fulcrum, thereby making it possible to respond to the vibrations of the magnetic sphere.
Due to the presence of this mechanism, it responds quickly and appropriately without causing any disturbances such as rolling. The magnetically responsive element according to the present invention uses a pair of upper and lower annular magnets with the same characteristics, and by arranging these annular magnets so that the same poles face each other, the material and adjustment of the magnetic spheres can be adjusted. Not only is it possible to always maintain the operating point of the magnetic sphere 16 constant regardless of its quality, but also stable seismic response characteristics are always maintained regardless of fluctuations in the magnetic characteristics of the annular magnet due to external temperature changes. It becomes possible to do so.

Further, according to the present invention, it is possible to apply a slight mechanical displacement to the magnetic sphere through the rod-shaped body 24 that is integrally attached to the magnetic sphere, as well as when a direct vibration action is applied to the cylindrical body. Therefore, the magnetic spheres can be reliably transposed from a predetermined balance state to another balance state without causing disturbances such as rolling, and these transpositions can be used to create various mechanical devices or controls. It can be widely applied as an element.

The element according to the present invention can be widely used as a vibration-sensing element having a vibration-sensing function by directly or indirectly incorporating the magnetic sphere into various control mechanisms.

For example, it can be applied not only directly to fluid switches, valve devices, etc., but also to various other electrical switch mechanisms. In addition, in the element according to the present invention, when resetting the dislocated magnetic sphere to its original state, it is possible to directly hold the magnetic sphere at the original position by a mechanical method. Although the embodiments have been described, it goes without saying that various design changes can be made without departing from the spirit of the invention.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the magnetically responsive element according to the present invention, FIG. 2 is a response characteristic curve diagram of the magnetically responsive element according to the present invention, and FIG. 3 is a sectional view showing another embodiment. be. 10... Cylindrical body, 12, 14... Annular magnet, 16... Magnetic sphere, 18... Guide hole, 20... Guide plate , 22, 24...
Yoke, 26... Ball seat, 28... Pedestal, 3
0...Sphere seat, 32...Through hole, 34...
...rod-shaped body, 36...perforated sliding plate.

Claims (1)

[Claims] 1. Annular magnets are arranged symmetrically and with the same polarity in the upper and lower parts of a non-magnetic cylindrical body, and yokes are arranged on the upper surface of the upper annular magnet and the upper or lower surface of the lower annular magnet, respectively. ,
A holding member having a spherical seat is provided in the hollow or upper part of the lower annular magnet, and the magnetic sphere is held on the spherical seat in a balance between its own weight and magnetic force, and the upper end of the cylindrical body and the upper annular A magnetic force responsive element characterized in that a non-magnetic guide plate is interposed between the magnet and a guide hole for magnetic spheres is bored in the guide plate. 2. A patent claim in which a yoke is disposed between the lower end of a non-magnetic cylindrical body and a lower annular magnet, and a holding member for holding a magnetic sphere is fixedly or slidably disposed on the center of the yoke. The magnetically responsive element according to scope 1. 3 A yoke is arranged on the lower surface of the lower annular magnet, and the holding member that holds the magnetic sphere consists of a pedestal fitted into the hollow part of the lower annular magnet, and a spherical seat fixed or slidably arranged on the pedestal. A magnetically responsive element according to claim 1. 4 Annular magnets are arranged symmetrically and with the same polarity at the upper and lower parts of the non-magnetic cylindrical body, an annular yoke is arranged on the upper surface of the upper annular magnet and the upper or lower surface of the lower annular magnet, and A holding member having a spherical seat in the hollow or upper part is provided, the magnetic sphere is held on the spherical seat in a balance between its own weight and magnetic force, and a through hole is bored in the center of the holding member. At the same time, a non-magnetic rod-shaped body is inserted into this through hole and fixed to the magnetic sphere, and a non-magnetic guide plate is interposed between the upper end of the cylindrical body and the upper annular magnet. A magnetic force responsive element characterized by having a guide hole for a magnetic sphere. 5 An annular yoke is arranged between the lower end of the non-magnetic cylindrical body and the lower annular magnet, and an annular holding member that holds the magnetic sphere concentrically with the annular yoke is fixed or slidably arranged on the upper surface of the annular yoke. A magnetically responsive element according to claim 4, which is formed by: 6 An annular yoke is arranged on the lower surface of the lower annular magnet, and a holding member that holds the magnetic sphere is fitted into the hollow part of the lower annular magnet and is fixed or slid on a pedestal having a tapered center hole. 5. The magnetically responsive element according to claim 4, comprising an annular spherical seat freely arranged.