JPH03261829A - Seismoscope - Google Patents

Abstract

PURPOSE:To reduce a whole size, simplify setting of seismic intensity and maintain predetermined seismic performance for a long time by converting horizontal movement of a pendulum weight to vertical rocking movement with a contact point between a circular part of a hung part and a circular seat as pivot. CONSTITUTION:A pendulum weight 2 is placed in a case 1 and moves horizontally. A movement conversion mechanism unit 3 converts horizontal movement of the pendulum weight 2 into vertical movement. The vertical movement of the pendulum weight 2, which has been converted by the movement conversion mechanism unit 3, is detected by a sensor 4. The movement conversion mechanism unit 3 comprises a circular hug part 9A formed on the upper end of a hanging axis 9 of the pendulum weight 2 and a circular seat 11b which is provided on the case 1 side and in contact with the circular part of the hung part 9A for supporting the pendulum weight 2 in a hanging state, and this converts horizontal movement of the pendulum weight 2 into vertical rocking movement with a contact point between the circular part of the hung part 9A and the circular seat 11b as a pivot R.

Description

[Detailed Description of the Invention] <Field of the Invention> The present invention is applied to, for example, a printed circuit board for a gas meter or other gas appliances, and detects when vibrations such as #A earthquake exceed a predetermined value (+i'i). The present invention relates to a seismic sensor used to achieve disaster prevention functions such as automatic power cutoff and automatic extinguishing of combustion equipment.

<Prior art and its problems> Examples of the YUZU seismic sensors that have been widely known include, for example, Utility Model Application Publication No. 55-21510 and Jitsuma II/3.
Publication No. 55-114943, Utility Model Application No. 55-119938
As disclosed in the above publication, there is a spherical type in which a spherical body such as a steel ball is placed on a spherical or tapered saucer, and the switch is opened and closed by the transfer of the spherical body due to vibration. , for example, Utility Model No. 55-289
38 Publication, Utility Model Publication No. 55-60529, Jitsuma 1i
As disclosed in the Patent Bulletin No. 55-28948, etc., a pendulum weight is suspended, and the horizontal direction or interlocking of the pendulum weight or a movable body connected to it in the horizontal direction and the vertical direction is detected. There is a pendulum system configured to do this.

In the case of the former spherical type seismic sensor, it is easy to increase the diameter and size of the entire seismic sensor in the horizontal direction because it requires a receiving tray that forms the transfer surface of the sphere! /).

On the other hand, in the case of the latter pendulum type seismic sensor, it is easier to downsize in the horizontal direction compared to the spherical type seismic sensor mentioned above, but in order to improve sensitivity it is necessary to increase the hanging distance of the pendulum. In the case of a conventional pendulum type seismic sensor, the overall length of the seismic sensor in the downward direction tends to be large and it is difficult to miniaturize it. The system disclosed in the publication has only one fulcrum for interlocking the pendulum weight, which makes it extremely difficult to set the initial motion acceleration, or seismic intensity, relative to the vibration strength, resulting in unstable seismic sensing performance and accuracy. It has its drawbacks.

Furthermore, in the case of the conventional pendulum-type seismic sensor shown in Japanese Utility Model Application Publication No. 55-28948, a hemispherical movable shaft connected to the upper end of the suspension shaft of the pendulum weight is inserted into a circular hole. Since the fulcrum structure is fitted with a pendulum, the circular hole gradually becomes thicker due to wear during use, and as a result, the actual length of the pendulum arm changes over time, reducing seismic performance. <Objective of the Invention> This invention was made to solve the above-mentioned problems of the conventional technology, and it is possible to reduce the overall size, and also to easily set the seismic intensity and to achieve a predetermined sensitivity. The purpose of the present invention is to provide a seismic sensor that can stably maintain seismic performance over a long period of time.

1. Configuration and effect of the vibration sensor The seismic sensor according to the present invention includes a case, a pendulum weight that is installed in the case and moves horizontally, and a motion converter that converts the horizontal movement of the pendulum weight into vertical movement. a detector for detecting the vertical movement of the pendulum weight converted by the mechanism unit, and the movement conversion mechanism unit includes an annular shape formed at the upper end of the hanging shaft of the pendulum weight. It consists of a hanging part and an annular receiving seat provided on the case side and abutting against the annular part of the hanging part to support the pendulum weight in a suspended form.

The pendulum weight is configured to convert the horizontal movement of the pendulum weight into an up-and-down swinging movement using a contact point between the annular portion of the hanging portion and the annular receiving seat as a fulcrum.

According to the earthquake sensor according to the present invention, i'11! When a certain amount of vibration, such as an earthquake, is applied, the pendulum weight moves horizontally, and this horizontal movement is converted into vertical movement by the motion conversion mechanism, and the vertical movement is detected by the detector, so the pendulum weight moves horizontally. The length of the weight can be made independent of the setting of the motion acceleration. As a result, since it is a pendulum type and there is no need to increase the length of the pendulum weight to improve sensitivity, the overall size can be reduced from both horizontal and vertical edges. .

Moreover, the fulcrum for the movement of the pendulum weight is constituted by an annular hanging part formed on the hanging shaft side of the pendulum weight and an annular receiving seat that comes into contact with the annular part of this hanging part. ,
It is easy to determine jQ of the initial motion acceleration with respect to the vibration intensity, and the seismic performance and accuracy can be stabilized. Further, since the relative movement between the annular portion of the hanging portion and the carrier seat in contact with the annular portion is restricted, changes in performance due to wear can be prevented and the life of the copper phase can be increased.

Furthermore, by changing the radius of the annular hanging portion and the annular receiving seat, the set motion acceleration, t, that is, the seismic intensity can be easily adjusted.

<Description of Embodiment> Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal cross-sectional view showing the configuration of a vibration sensor according to an embodiment of the present invention. This vibration sensor is roughly divided into a cylindrical case 1 and a horizontally movable A pendulum type s12, a motion conversion mechanism 3 that converts the horizontal movement of the pendulum weight 2 into vertical movement, and a detector 4 that detects the vertical movement of the pendulum weight 2 converted by the movement conversion mechanism 3. And, when the case 1 is installed at an angle, the pendulum weight 2 is sometimes
, an automatic horizontal mechanism section 5 that automatically holds the sensor IM section horizontally, which is composed of an interlocking conversion mechanism section 3 and a detector 4, and a part of a viscous liquid damper that provides a damping effect to the horizontal mechanism section 5. It consists of 6.

The above-mentioned case l consists of a case main body IA that opens upward and a case cover IB that is attached to the top of the case main body IA.
The lower end portions of the case body IA are arranged in opposing positions in the radial direction of the case body IA, and the upper end portions thereof extend into the case cover IB. External fixed terminals 7A and 7B are provided upright, and an opening of the case body IA corresponding to the center between the pair of external fixed terminals 7A and 7B facing each other is provided with an opening in the case body lAt-radial direction. A flat-shaped beam member 8 is installed across the bridge.

The pendulum type i12 has a hanging shaft 9 passing through its center, and a truncated cone-shaped hanging portion 9A as clearly shown in FIG. 2 is formed at the upper end of the hanging shaft 9. - On the other hand, a disc-shaped middle base 11 suspended inside the case l via an automatic horizontal mechanism section 5, which will be described later, has a through hole 11A having a diameter that allows the horizontal movement of the hanging shaft 9. Along with being formed.

An annular seat 11 is provided at the upper end of the through hole 11A, which abuts against the peripheral edge of the annular lower surface of the frustoconical hanging portion 9A.
A large diameter through hole 11B having a diameter b is formed, and the pendulum type 8! A motion converting mechanism section 3 is configured to convert the horizontal motion of 2 into an up-and-down rocking movement using a fulcrum R at the contact point between the annular seat 11b and the peripheral edge of the lower surface of the hanging section 9A. .

If ud is the inner diameter of the fulcrum H in this vertical motion converting mechanism 3, and g is the distance from the fulcrum R to the center of the hanging shaft 9, that is, the point of effort, then the motion acceleration G of the pendulum weight 2 is G = ( d/sentence g)X980 ・・・・・・・・・(
1) is set. Therefore, by changing the diameters of the truncated conical hanging portion 9A and the through hole 11B, the set operating acceleration G of the pendulum weight 2, that is, the seismic intensity sensed by this seismic sensor, can be adjusted. ing.

The detector 4 is composed of a contact switch mechanism that converts the vertical motion of the pendulum weight 2 converted by the vertical motion conversion mechanism 3 into an electrical signal, and as shown in FIG. A notch 611c consisting of four branch holes 11C1 and a circular hole 11c2 in the center is formed on the top surface, and the center of the movable piece 13 having a similar shape to the notch hole 11C is formed from above into the notch 611C. Disk portion 13a
is in contact with the top surface of the hanging portion 9A of the hanging shaft 9, and a movable contact 14 is fixed to the top surface of this central disk portion 13a.

First, the middle base 11 and a disk-shaped base 16 fixed to the upper surface of the middle base 11 via a plurality of screws 15.
A band-shaped fixing piece 17 with one end 17a held between the
A fixed contact 18 that enables the movable contact "l 4 to come into contact with and separate from it is fixed to the center in the longitudinal direction. A right contact switch mechanism that forms the detector 4 by one or more movable contacts 14 and the fixed contact 18. is configured.

A cut groove 11D having a width slightly larger than the width of the fixing piece 17 is formed in the peripheral part of the upper surface of the inside part 711 corresponding to the other end 17b in the longitudinal direction of the fixing piece 17. A female threaded hole 11cl is formed in the bottom surface of the groove LLD, and a notch hole 16A is also formed in the periphery of the base 16 corresponding to the other end 17b of the fixing piece 17. By adjusting the screwing amount of the contact position adjustment screw 28 screwed into the female screw hole lid from the through hole 17C of the other end 17b of the fixed piece 17 through the through hole 17C, the other end 17b of the fixed piece 17 can be fixed. Displace it up and down using the one end 17a side as a fulcrum, and
The distance between the contacts 14 and 18 is configured to be variable. By varying the distance between the two contact points 14 and 18, the operating acceleration of the pendulum type 342 can be finely adjusted.

Further, a movable terminal 19, which is formed integrally with the movable piece 13 and is bent upward and stands up, projects above the base 16 through holes 17d and 16B formed in the fixed piece 17 and the base 16, respectively. At the same time, the fixed terminal 20 cut and raised from the fixed piece 17 is attached to the base 16.
It protrudes above the base i6 through the notch hole 16A. These movable and fixed terminals 19 and 20 are @
As shown in Figure 4, a pair of external fixed terminals 7A and 7B fixed to the case body IA are arranged opposite to each other, and coiled leads are connected between these opposing terminals 19.7A and 20.7B, respectively. Lines 21, 22 are interposed. Both ends of these coiled lead wires 21.22 are inserted into the notches 19a, 7Aa and 20a, 7Ba formed at the upper end of each terminal 19.7A and 20.7B from above and caulked or brazed. By doing so, the opposing terminals 19 and 7A and 20a and 7B are electrically connected, respectively.

As shown in FIGS. 1 and 4, a fulcrum member 23 having a convex spherical portion 23a projecting upward is press-fitted and fixed to the longitudinal center of the beam member 8 installed on the case body IA. At the same time, the spherical part 23 of this fulcrum member 23
A disc-shaped movable member 24 is provided, which has a concave spherical surface 24a in the center of its lower surface that makes point contact with the movable member 24, and a pair of hanging pieces 25 extend downward from diametrically opposed parts of the movable member 24.
．． At the lower end of 25 is a locking claw 25a that projects outward in the radial direction.
, 25a are integrally formed, and the pair of hanging pieces 25.25 are formed in the base 16 through a through hole 16C,
16D into the lower blade of the base 16, and the above-mentioned locking claw 2
By locking 5a and 25a to the lower surface of the base 16, the case l can be mounted at an angle. +! A Yajiropei type automatic leveling mechanism section 5 is configured to automatically hold the tremor section horizontally.

The viscous liquid damper part 6 is attached to the case cover 1B.
, a ring-shaped liquid-tight member 26 fitted into the case cover IB, a flexible pJ membrane 27 made of rubber or the like having a thick wall portion 27a with a substantially circular cross section around it, and oil filling the gap. It consists of a viscous liquid 28 such as. To be more specific, as shown in FIG. and the liquid-tight member 26 to form a gap 29 between the case cover IB and the OT flexible thin film 27, and to form a gap 29 between the case cover IB and the OT flexible thin film 27.
After filling the two voids with the viscous liquid 28 from Bb, the hole IBb is filled.

For example, a predetermined viscous liquid damper portion 6 is constructed by sealing with an ultraviolet curable adhesive 30. Note 2. A protrusion 31 protrudes from the center of the top wall IBa of the case cover IB, which provides resistance to the flow of the enclosed viscous liquid 28 and enhances the damper function.

The above OT in this viscous fluid damper part 6) 1%
By bringing the upper surface of the disk-shaped movable member 24 in the automatic horizontal mechanism section 5 into contact with the lower surface of the magnetic fh membrane 27, a damping effect is applied to the automatic horizontal mechanism section 5 and the vibration sensing section, and the horizontal The structure is such that the same seismic characteristics are maintained in both cases of mounting and inclined mounting.

Next, the overall operation of the seismic sensor configured as described above will be explained.

In the state shown in FIG. 5(A), the cable is mounted horizontally on, for example, a printed circuit board for a gas meter so that the center of the hanging shaft 9 of the pendulum weight 2 is vertical.

The movable contact 14 and fixed contact 18 of the right contact switch mechanism 4 are separated from each other as shown in FIG. 5(B).

If this type of installation is subjected to vibrations that exceed the set value, such as during an earthquake, the pendulum type i1 as shown in Figure 6 (A)
2 moves horizontally with the acceleration G shown in the above (1) above formula,
With this horizontal movement, the hanging portion 9A at the upper end of the hanging shaft 9 swings up and down around the fulcrum H, thereby converting the horizontal movement into a vertical movement, and the force is increased by the lever action.
1 width.

As a result of this vertical movement, the central disk portion 13a of the movable piece 13 is elastically displaced upward as shown in FIG. The number is turned on.

As a result, the coiled lead wire 22. Fixed terminal 20, fixed piece 17,
Contact points 18, 14. Movable piece 13. A predetermined detection operation is performed by electrically conducting through the movable terminal 19 and the coiled lead wire 21.

Furthermore, when the case 1 is installed at an angle, the entire vibration-sensing section is held horizontally as shown in FIG. 7 by the automatic leveling action of the automatic leveling mechanism section 5 described above. At this time, since the upper surface of the disc-shaped movable member 24 of the automatic leveling mechanism section 5 is in contact with the lower surface of the flexible thin member 27 of the viscous liquid damper part 6, the relative Swinging of the vibration sensing part above a certain level due to a tilt displacement is regulated, and unexpected detection operations can be prevented.

Such inclined mounting is in condition #l! The vibration-sensing operation when a vibration exceeding a set value is applied, such as an earthquake, is almost the same as in the above-mentioned case of horizontal mounting, so the explanation will be omitted.

FIG. 8 shows a modified structure of the motion conversion mechanism section 3 that converts the horizontal motion of the pendulum type M2 into vertical motion, in which a U-shaped hanging section 9A with a downwardly open cross section is formed at the upper end of the hanging shaft 9. ,
An annular groove 11BI is formed on the outer periphery of the through hole 11A at the center of the disc-shaped inner base 11, and a sharp tip of the peripheral wall of the hanging portion 9A is formed on the annular seat 11b formed from the bottom surface of the annular yjIIBI. The hanging shaft 9 is suspended and supported by bringing the portions 9a into contact with each other. In this case, the swinging fulcrum R for vertical motion conversion is the five contact points of the sharp tip portion 9a with the seat 11b, and the inner diameter of the peripheral wall of the hanging portion 9A and the annular groove 11.
By changing the diameter of BI, the set motion acceleration G of the pendulum type i42 can be adjusted freely.

In addition to the contact switch and switch mechanisms shown in the above embodiments, vertical motion detectors include capacitive sensors, optical sensors, reed switch sensors, pressure-sensitive sensors, differential transformer sensors, and magnetic sensors. A sensor or the like may be used, and the same effect as in the above embodiment can be achieved no matter which one is used.

Furthermore, although the above embodiment is applied to a seismic sensor equipped with the automatic leveling mechanism section 5, it can also be applied to a seismic sensor that does not have the automatic leveling mechanism section 5 and the damper part 6. It is.

Further, as the tambour 6, a viscous liquid type one as shown in the above embodiment is most suitable, but an air damper may also be used in addition to this, and the same effect can be obtained.

Further, in the above embodiment, the fulcrum member 23 is press-fitted into the beam member 8 and fixed, but it may be formed integrally with the beam member 8.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing the configuration of a vibration sensor according to an embodiment of the present invention, FIG. 2 is an enlarged vertical sectional view of the vertical motion conversion mechanism, and FIG. 3 is a detailed configuration of the contact switch mechanism. FIG. 4 is an exploded perspective view of the main parts showing the configuration of the automatic leveling mechanism, FIGS.
CB) and FIG. 7 are longitudinal cross-sectional views for explaining the seismic sensing operation, and FIG. 8 is an enlarged longitudinal cross-sectional view of the vertical motion converting mechanism section of a seismic sensor according to another embodiment of the present invention. 1...case! A... Case body, IB... Case cover, 2... Pendulum weight, 3... Motion conversion mechanism section, 4... Right contact switch mechanism (an example of a detector), 9
... Hanging shaft, 9A... Hanging part, llb... Disc-shaped seat, R... Fulcrum. Patent Applicant: Omron Corporation No. 1 Figure 1B - Goose η 8 - 9 Guno Komura

Claims (1)

[Claims] (1) A case, a pendulum weight installed in the case that moves horizontally, a motion conversion mechanism unit that converts the horizontal movement of the pendulum weight into vertical movement, and a movement conversion mechanism unit that converts the horizontal movement of the pendulum weight into vertical movement, and the pendulum weight converted by this mechanism. a detector for detecting vertical motion; It consists of an annular receiving seat that supports the pendulum weight in a suspended manner by contacting the annular part, and when the pendulum weight moves horizontally, the contact point between the annular part of the hanging part and the annular receiving seat is used as a fulcrum. A seismic sensor characterized in that it is configured to convert into vertical rocking motion.