JPH09311068A - Seismic device - Google Patents

Abstract

(57) [Abstract] [Problem] Normal ON / O even when high acceleration vibration is applied.
The duty ratio of the FF signal is obtained, and a seismoscope that operates normally with respect to vibrations from low acceleration to high acceleration is obtained. SOLUTION: The shape of a bottom portion 31 in the seismic case 3 is a gentle slope in a portion 32 near a recess 34 at the center of the bottom portion and a steep slope in a distant portion 33 apart from the center of the bottom portion. When detecting an earthquake with a seismic intensity of 5, a gentle slope of 5 to 6 degrees and a steep slope of 12 to 14 degrees are desirable. In addition, in FIG. 1, two stages of a gentle slope and a steep slope are used, but it is effective to use more stages or a curved face. Also, the same function as the steep slope,
It can also be realized by disposing a spring on the outer peripheral portion of the spherical body 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a printed circuit board built in a gas meter, detects a vibration such as an earthquake exceeding a predetermined standard, and outputs a switch signal to prevent a disaster from occurring. The present invention relates to a vibration sensor that is a vibration detection sensor.

[0002]

2. Description of the Related Art Generally, a vibration sensor, which is a vibration detecting sensor, is mounted on a tray on a tapered surface provided at the bottom of the vibration sensing case when a vibration exceeding a predetermined standard is applied. The moving sphere moves, and the horizontal movement of the sphere due to vibration is converted into the vertical movement of the mover, and the movable contact is moved up and down, and it is turned on and off with the fixed contact. With this ON / OFF signal, the microcomputer on the printed circuit board counts the duty ratio of the ON / OFF signal and causes the shutoff operation. In the case of detecting an earthquake, it is common to perform a blocking operation at an earthquake with a seismic intensity of 5.

The structure of a conventional seismoscope will be described with reference to the drawings. 4A and 4B are cross-sectional views showing the structure of a seismic sensor according to the prior art. FIG. 4A shows the entire structure, and FIG. In FIG. 4, a suspension / resistance member 2 (simply referred to as resistance member 2 in the drawing) is fixed to the uppermost part of the outer case 1. On the other hand, a bottomed cylindrical damper case 9 is arranged on the upper part of the vibration-sensitive case 3, and a damper material 8 made of silicon gel is filled inside the damper case 9. A support plate 11 is provided on the uppermost part of the vibration-sensitive case 3 while holding both ends of the damper case 9. The support plate 11 and the suspension / resistance member 2 are suspended from each other, and the seismic case 3 is suspended from the support plate 11 by the suspension, and the horizontal state is automatically maintained.
Moreover, it can swing. Inside the vibration-sensing case 3, a sphere 4 is arranged, and in a state where there is no vibration, the sphere 4 is stopped at the position of the recess 34 at the center of the bottom by a gentle inclination of about 5 degrees at the bottom. When vibration exceeding a certain standard is applied, the sphere 4 rolls from the central depression 34, pushes up the actuators A5 and B6, and turns the contact 7 ON / OFF.

FIG. 5 shows this state. Due to the vibration, the spherical body 4 is in contact with the right side surface of the vibration-sensing case 3, and the spherical body 4 pushes up the right side of the actuator-A5 and also pushes up the right side of the actuator-B6, and the center of the actuator-B6 is pushed up. The protrusion pushes up the movable contact of the contact 7 to bring it into contact with the fixed contact.

[0005]

In such a conventional technique, there is a problem that the bottom of the vibration-sensitive case 3 in which the spherical body 4 rolls is a slope having a gentle constant inclination. That is, when high-acceleration vibration is applied, the damping force of the damper part is set according to the case of low-acceleration vibration. Therefore, with the sphere 4 attached to the side surface of the vibration-sensing case 3, The seismic case 3 and the sphere 4 move together for a longer time, the reciprocating movement of the sphere 4 is not stable, and normal ON / OFF
There is a problem that the duty ratio of the signal cannot be obtained, so that the count process is not performed on the microcomputer side and the interruption operation cannot be performed. The damping force of the damper unit is adjusted to the vibration of the low acceleration because the viscosity of the damper material 8 has an upper limit in order to keep the vibration sensing case 3 horizontal, and it is recommended that the damping force is set to the low acceleration side from the characteristic specifications of the vibration sensing device. Because it is necessary to set the damping force.

If all the bottoms of the seismic case 3 are steep, the sphere cannot roll sufficiently at low acceleration,
Contact 7 cannot be turned ON / OFF. This invention solves the above-mentioned problem that a normal duty ratio of ON / OFF signal cannot be obtained when high acceleration vibration is applied, and operates normally from low acceleration to high acceleration. The challenge is to supply seismic devices.

[0007]

According to the present invention, the shape of the conical bottom portion having the inclined surface in the seismic case is a gentle slope in the central portion within the contact area of the sphere, and a steep slope as the distance from the center increases. The shape is By making the center part a gentle slope, it operates normally against low acceleration vibration, and by making it a steep slope as it goes farther from the center, the force to move from the slope to the center part that the sphere receives is increased, It stabilizes the reciprocating motion of the sphere and operates normally even with high-acceleration vibration.

As a method of forming a steep slope as it gets farther from the center, there are a stepwise method and a method of adopting a curved surface. As for the inclination angle, in order to operate normally against low-acceleration earthquakes of seismic intensity 5, it is desirable that the angle of the gentle slope in the center be 5 to 6 degrees, and even for high-acceleration earthquakes. For proper operation, it is desirable that the angle of the outermost slope with which the sphere can contact is 12 to 14 degrees.

As another means for operating normally even with a high-acceleration earthquake, there is means for disposing a spring outside the sphere inside the seismic case within the range in which the sphere moves. By utilizing the repulsive force that accompanies the horizontal deformation of the spring, the reciprocating motion of the sphere is stabilized and the normal operation is performed even with a high acceleration earthquake, similar to a steep slope.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The basic aim of the present invention is to make a stable reciprocating motion of a relative movement of a tremor case and a sphere arranged therein due to vibrations such as an earthquake, at both low acceleration and high acceleration. It is to be exercise. To this end, the bottom of the seismic case is adjusted in inclination and springs are used.

Examples will be described below. (First Embodiment) FIG. 1 shows a first embodiment of a seismoscope according to the present invention.
2A is a cross-sectional view showing the structure of the embodiment of the present invention, FIG. 3A is an overall view, and FIG. Note that the entire configuration other than the vibration-sensitive case and the operation of the vibration-sensitive device are exactly the same as in the case of the conventional example shown in FIGS.

In this embodiment, the bottom 31 of the seismic case is shown in FIG. 1 in order to operate normally even with high acceleration vibration.
The structure is as shown in (b). Bottom of seismic case
Similar to the prior art, there is a dent 34 in the center of the 31 where the sphere 4 stands still when there is no vibration, and in the vicinity of the center of the bottom of the periphery of the pit 34, the same inclination as in the prior art of 5 degrees There is a sloping slope, which is far from the center of the bottom on the outside.
On 33, a steep slope having a slope of 13 degrees is formed over the area of the contact area of the sphere.

According to the results of a study by the inventor, among the earthquakes having the seismic intensity of 5, when the acceleration is large, the duty ratio of the ON / OFF signal is most stable when the inclination of the steep slope is 13 degrees. It was unstable at 9 and 17 degrees. The optimum value of this inclination naturally changes when the maximum acceleration value of the earthquake changes, and the above-mentioned 13 degrees corresponds to an earthquake of seismic intensity 5.

The bottom of the seismic case of this embodiment has a two-stage structure of a gentle slope and a steep slope, but it is naturally effective to have three or more stages. Further, it is similarly effective to form a curved surface such as an arc, a parabola, or a hyperbola, instead of a stepwise manner. (Second Embodiment) FIGS. 2 and 3 are a sectional view showing a structure of an embodiment of a second invention of a seismoscope according to the present invention and a sectional view showing an operating state.

In this embodiment, the coil spring 10 (referred to as the spring 10 in FIG. 2) covers the periphery of the sphere 4 in the seismic case 3 in order to operate normally even with high acceleration vibration. Is attached to the bottom of the seismic case 3, and the inclination of the bottom of the seismic case is a gentle slope of 5 degrees as in the prior art. When the sphere 4 rolls on the bottom of the seismic case due to the vibration and deforms the coil spring, the spring force tends to return the sphere 4 to the central part in proportion to the amount of deformation. It will operate normally even with vibration of acceleration.

[0016]

According to the first aspect of the present invention, the inclination of the bottom of the vibration-sensing case on which the sphere rolls is a gentle slope in the vicinity of the center and a steep slope in the distance away from the center. By making the distant part away from the center a steep slope, even in high acceleration vibration, as in the case of low acceleration vibration,
Since the ON / OFF signal with an appropriate duty ratio is output, it is possible to obtain a seismoscope with stable characteristics.

In the second aspect of the present invention, the spring is arranged around the sphere inside the vibration-sensing case. The reaction force of the spring generated by the deformation of the sphere causes the ON / OFF signal with an appropriate duty ratio to be output even in high-acceleration vibrations. You can get a shaker.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a first embodiment of a seismoscope according to the present invention.

FIG. 2 is a cross-sectional view showing the structure of a second embodiment of the seismoscope according to the present invention.

FIG. 3 is a sectional view showing an operating state of the second embodiment.

FIG. 4 is a cross-sectional view showing the structure of a seismoscope according to the prior art.

FIG. 5 is a cross-sectional view showing the operating state of the seismic sensor.

[Explanation of symbols]

 1 Outer case 2 Resistance member 3 Seismic case 30, 31 Bottom part of seismic case 32 Near center of bottom 33 Far from center of bottom 34 Dimple 4 Sphere 5 Actuator-A 6 Actuator-B 7 Contact 8 Damper 9 Damper Case 10 Spring 11 Support plate

Claims (5)

[Claims] 1. An outer case, a seismic case suspended in the outer case and having a damper part, a sphere arranged on a conical bottom part having an inclined surface in the seismic case, and an external part. In a seismoscope equipped with a contact mechanism that outputs an ON / OFF signal corresponding to the displacement of the sphere due to the vibration applied from, the shape of the conical bottom with the inclined surface in the seismic case is the range of contact with the sphere. In, the central part is a gentle slope,
A seismoscope characterized by having a seismic case that has a shape that becomes steeper as it moves away from the center. 2. The seismoscope according to claim 1, wherein the shape of the conical bottom part is a multi-step structure having at least two steps, with a gentle slope in the central part and a steep slope toward the outside. Characteristic seismic device. 3. The seismoscope according to claim 1, wherein the shape of the conical bottom is a gentle slope at the center and a steep slope toward the outside. . 4. The seismoscope according to any one of claims 1 to 3, wherein an angle of the gentle slope of the central portion is 5 to 6 degrees, and an angle of the outermost slope where the sphere can contact. A seismoscope characterized in that it is between 12 and 14 degrees. 5. An outer case, a seismic case suspended in the outer case and having a damper part, a sphere arranged on a conical bottom part having an inclined surface in the seismic case, and an external part. In a seismoscope equipped with a contact mechanism that outputs an ON / OFF signal corresponding to the displacement of the sphere due to the vibration applied from the outside of the sphere inside the seismic case, a spring is provided within the range in which the sphere moves. A seismic device characterized by being present.