JP3052416B2 - Seismic sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic shutoff of a power supply and an automatic fire extinguishing of a combustion device when a vibration exceeding a predetermined value such as an earthquake is detected when the vibration is attached to a printed circuit board for a gas meter or other gas appliances. It is related to a seismic sensor that achieves a disaster prevention function such as.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open Nos. 55-21510, 55-114943, and 55-1
As disclosed in Japanese Patent Publication No. 19938 and the like, a sphere such as a steel ball is placed on a spherical or tapered tray, and the switch is opened and closed by rolling of the sphere due to vibration. Things and, for example, Shokai 5
As disclosed in JP-A-5-28938 and JP-A-57-74625, a pendulum weight is suspended in a case, and the pendulum weight or a movable body integrally provided with the pendulum weight is horizontally suspended. There is a pendulum type configured to detect the direction and the vertical movement. In the case of the former ball-type seismic device, a saucer that forms the rolling surface of the sphere is required, and since the setting is determined by the shape of the saucer, the entire seismic device is likely to be large in the horizontal direction.

On the other hand, in the case of the latter pendulum type seismic sensor, although it is easier to reduce the size in the horizontal direction than the above-mentioned spherical type, it is necessary to extend the pendulum suspension distance in order to improve sensitivity. Therefore, the overall length of the seismic sensor in the vertical direction is likely to be large, and it is difficult to reduce the size. Furthermore, when the case is installed with an inclination, the seismic sensor is affected by the inclination, and the relative inclination between the case and the seismic sensor at the time of installation is sensed, causing malfunction or vibration to be sensed. , That is, the set seismic intensity fluctuates, and further, the operation deviation due to the direction of vibration increases.

[0004] In particular, if the suspension distance of the pendulum is increased in order to improve the sensitivity, the pendulum vibrates minutely before the switch mechanism is turned on, and chattering occurs in the ON operation of the switch mechanism. Becomes unstable. Therefore, if the switch mechanism is to be turned on only when the vibration exceeds the set value, it is necessary to increase the spring force of the switch mechanism. As a result, the switch mechanism is turned on by the strong spring. Delayed by force, unable to increase the responsiveness of the seismic sensor.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is possible to reduce the size of the entire apparatus and to accurately perform a predetermined seismic operation even when the mounting posture of the case is inclined. An object of the present invention is to provide a seismic sensor which can be performed, has a small operation deviation due to the direction of vibration, and has high reliability of seismic operation.

[0006]

According to the present invention, there is provided a seismic device in which a pendulum mechanism having a weight that performs a pendulum motion is installed in a case, and a motion conversion for converting the pendulum motion of the pendulum mechanism into a vertical motion. A mechanism for converting the vertical motion of the pendulum mechanism converted by the motion converting mechanism into an electric signal; and further comprising a pendulum mechanism, a motion converting mechanism when the case is tilted and mounted. And an automatic leveling mechanism for automatically holding the seismic part comprising a switch mechanism horizontally, and a damper part for imparting a vibration damping action to the automatic leveling mechanism. A disk-shaped head formed at the upper end of the suspension shaft of the weight, a middle base formed with a bearing seat that pivotally supports the disk-shaped head, the pendulum mechanism and the switch mechanism. Interposed between Serial and the movable disc made of a magnetic material to convert the pendulum motion of pendulum mechanism in the vertical movement, are mounted on the in the base, characterized in that a Magunetsuto for sucking the movable disc.

[0007]

According to the structure of the present invention, when vibration exceeding a certain level such as an earthquake is applied, the pendulum weight moves in a pendulum, and this pendulum motion is converted into a vertical motion by a motion converting mechanism, and the vertical motion is switched. Since the signal is converted into an electric signal by the mechanism, the length of the pendulum weight can be made independent of the setting of the operation acceleration. Therefore, since the pendulum system is used and the length of the pendulum weight does not need to be too large for improving the sensitivity, the overall size can be reduced in both the horizontal direction and the vertical direction. Also, even if the case is installed at an angle, the automatic leveling mechanism works,
The seismic unit consisting of the pendulum mechanism, the motion conversion mechanism, and the switch mechanism can be automatically held horizontally, and the horizontal mechanism can be damped through the damper part. It is possible to reliably and accurately achieve a predetermined seismic operation by minimizing an operation deviation due to a fluctuation of a vibration value to be sensed or a direction of the vibration.

Further, when the pendulum mechanism section makes a pendulum motion with the contact point between the annular bearing seat and the suspension portion as a fulcrum, the pendulum motion can be converted into a vertical swing motion of the movable disk. The movable disk swings in response to an omnidirectional pendulum movement around the fulcrum, thereby opening and closing the switch mechanism. Therefore, the seismic motion in all directions around the fulcrum can be reliably and accurately performed by one switch mechanism. Moreover, since the movable disk is made of a magnetic material and is attracted to the magnet and is held on the middle base by its magnetic force, the pendulum movement of the pendulum mechanism is only performed when a vibration exceeding a set value is applied. Since it is permissible and does not respond to vibration below the set value, it is possible to effectively prevent chattering from occurring when the switch mechanism is turned on, and to stabilize the seismic operation. Further, since the pendulum motion of the pendulum mechanism is suppressed by the attraction between the movable disk and the magnet,
The switch mechanism does not need to be involved in the suppression operation. Therefore, it is possible to reduce the spring force of the switch mechanism and achieve a high-speed ON operation of the switch mechanism.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a configuration of a seismic sensor according to an embodiment of the present invention.
A cylindrical case A, a pendulum mechanism B having a weight 1 installed in the case A and having a pendulum motion, and a motion conversion mechanism C for converting the pendulum motion of the pendulum mechanism B into a vertical motion.
And a switch mechanism D for converting the vertical motion of the pendulum mechanism B converted by the motion conversion mechanism C into an electric signal.
And the pendulum mechanism B when the case A is tilted and mounted.
An automatic leveling mechanism F for automatically holding the seismic sensor E comprising a motion converting mechanism C and a switch mechanism D horizontally; and a viscous liquid for providing a vibration damping action to the seismic sensor E and the horizontal mechanism F. And a damper part G.

The case A comprises a case body 2 which is open upward and a case cover 3 which is mounted on the upper part of the case body 2. The fixed terminals 4 and 5 are erected, and their lower ends are projected below the case main body 2, and the upper ends are extended into the case cover 3. Further, the opening of the case main body 2 is provided with the case main body 2.
Is traversed in the radial direction, and a flat bar-shaped beam member 6 is erected.

The pendulum mechanism B has a suspension shaft 7 penetrating the center of the pendulum weight 1 to hold the weight 1 at the lower end thereof, and has a disk-shaped head 7a at the upper end of the suspension shaft 7. Hanging portion 8 is formed. On the other hand, a through hole 10 having a diameter allowing the horizontal movement of the suspension shaft 7 is formed in the disk-shaped middle base 9 suspended from the case A via an automatic horizontal mechanism F described later. In addition, an annular bearing seat 9a is formed at the upper end of the through hole 10 to abut on the lower peripheral edge of the hanging portion 8, and the annular bearing seat 9a is The pendulum mechanism B is configured to perform a pendulum motion by using the contact point between the annular bearing seat 9a and the peripheral edge of the lower surface of the suspension 8 as a fulcrum by suspending the suspension 8 at the upper end by hanging the neck. I have.

A concave portion 9b for accommodating the disk-shaped head 7a is formed in the middle base 9, and a ring-shaped magnet 11 is mounted on the inner surface of the recess 9b, so that the disk-shaped head 7a and the magnet 11 are mounted. A movable disk 12 made of a magnetic material is concentrically mounted on the upper surface of the recess 9b.
It is stored in. Thereby, when the pendulum mechanism B makes a pendulum motion with the contact point between the annular bearing seat 9a and the peripheral edge of the lower surface of the hanging portion 8 as a fulcrum, the pendulum motion is moved up and down of the movable disk 12. A motion conversion mechanism C that converts the motion into motion is configured.

A switch mechanism D for converting the pendulum motion of the pendulum mechanism B into a vertical motion by a motion conversion mechanism C and converting the same into an electric signal is configured as follows. That is, a movable contact piece 13 is provided at the center of the upper surface of the movable disk 12, the tip of which is in contact with the movable disk 12. The base end of the movable contact piece 13 is fixed to the upper surface of the middle base 9 via a plurality of screws. Movable terminal 14 set on a disc-shaped base 17
It is fixed to. On the other hand, fixed contacts 15 are opposed to each other at predetermined intervals on the upper surface of the movable contact piece 13 on the distal end side, and the fixed contacts 15 are provided on fixed terminals 16 set on the base 17.

The movable and fixed terminals 14, 16
Lead terminals 14a, 16a project upward and protrude therefrom, and are arranged opposite to a pair of external fixed terminals 4, 5 fixed to the case body 2, and these opposed terminals 4, 14 are provided.
a and coiled lead wires 1 between 5, 16a
8, 18a are connected in a bridging manner. According to the above configuration, the switch mechanism D is configured, and the electrical wiring thereof can be performed simply and easily.

A projecting spherical surface 19a projecting upward is provided at the center in the longitudinal direction of the beam member 6 bridged over the case body 2.
Is fixed by press-fitting, and a disk-shaped movable member 20 having a spherical portion 20a at the center thereof, which is suspended in sliding contact with the upper surface of the convex spherical surface 19a of the fulcrum member 19
Is provided. Locking claws 21a, 21a projecting outward in the radial direction are integrally formed at the lower ends of a pair of hanging pieces 21, 21 extending downward from radially opposed portions of the movable member 20, The pair of hanging pieces 21 and 21 are inserted below the base 17 through the through holes 17a and 17a formed in the base 17, and the locking claws 21a and 21a are inserted.
Is fixed to the lower surface of the base 17 so that the case A
A jiro bay type automatic leveling mechanism F for automatically holding the above-mentioned seismic section E horizontally at the time of inclination mounting is constituted.

A flexible thin film 23 made of rubber or the like is provided on the inner surface of the case cover 3 so as to face with a predetermined gap 24, and a thick portion 23a having a substantially circular section is formed around the flexible thin film 23.
And the inner surface of the case cover 3 and the ring-shaped liquid-tight member 22.
Then, a viscous liquid 25 such as oil is filled into the space 24 from a hole (not shown) provided in the case cover 3 and then the hole is sealed with, for example, an ultraviolet curable adhesive. It is sealed via an agent.

The outer surface of the spherical portion 20a of the disk-shaped movable member 20 is pressed against the lower surface of the central portion of the flexible thin film 23, and the upper surface of the central portion of the flexible thin film 23 is contacted with the flexible thin film 23 via the flexible thin film 23. Spherical portion 26 to which the outer surface of spherical portion 20a is fitted
a disk-shaped vibration damping member 26 having a concave portion a formed on the top wall portion 3a of the case cover 3 is provided on the upper surface of the spherical portion 26a of the disk-shaped vibration damping member 26.
c so as to be slidable. That is, the disk-shaped damping member 26 set at the center of the top wall 3a of the case cover 3 gives resistance to the flow of the viscous liquid 25 enclosed therein, thereby enhancing the damper function.
The above configuration constitutes a predetermined viscous liquid damper portion G. That is, the viscous liquid damper portion G is brought into contact with the lower surface of the flexible thin film 23 by contacting the upper surface of the disk-shaped movable member 20 in the automatic horizontal mechanism portion F,
Vibration damping action is applied to the automatic horizontal mechanism F and the seismic sensor E so that the same seismic characteristics are maintained regardless of whether the case A is mounted horizontally or inclined.

Next, the operation of the above configuration will be described. When the case A is horizontally mounted on a printed board for gas meter, for example, so that the center of the suspension shaft 7 of the pendulum mechanism B is vertical, the movable contact piece 13 and the fixed contact 15 of the switch mechanism D are not shown. They are separated like 1. That is, the movable disk 12 made of a magnetic material is
And is held on the middle base 9 by the magnetic force, unless vibration exceeding a set value such as an earthquake is applied.
The pendulum mechanism B does not perform a pendulum motion, and there is no possibility that the switch mechanism D is inadvertently turned on. In such a state, when vibration exceeding a set value such as an earthquake is applied, FIG.
As shown in FIG. 5, the pendulum mechanism B makes a pendulum motion by overcoming the magnetic attraction force of the magnet 11, and the hanging portion 8 at the upper end of the suspension shaft 7 swings up and down around the bearing seat 9a with the pendulum motion. . Along with this vertical movement, the movable disk 12 attracted by the magnetic force of the magnet 11 makes a swinging movement of displacing the other end 12a upward with one end in the radial direction as a fulcrum R. Is elastically displaced upward to bring the movable contact piece 13 of the switch mechanism D into contact with the fixed contact 15 to turn on the switch. As a result, the coil-shaped lead wire 18, the movable terminal 14,
Electrical conduction is performed via the movable contact piece 13, the fixed contact 15, the fixed terminal 16, and the coiled lead wire 18a, and a predetermined seismic operation is performed.

By the way, according to the above configuration, in the entire process of turning on the switch mechanism D by the pendulum movement of the pendulum mechanism B, the movable disk 12 is attracted to the magnet 11 and the disk-shaped head 7a and the magnet On the upper surface of 11, a movable disk 12 made of a magnetic material is always held in pressure contact with the middle base 9 by its magnetic force. The movable disk 12 rotates in a stable state from the start of the pendulum movement until the switch mechanism D is turned on. Therefore, chattering can be effectively prevented from occurring when the switch mechanism is turned on, and the seismic operation can be stabilized.

Further, as described above, since the pendulum movement of the pendulum mechanism B is suppressed by the attraction between the movable disk 12 and the magnet 11, the movable contact piece 13 of the switch mechanism D
, The speed of the on-operation of the switch mechanism D can be increased. Now, assuming that the swing angle of the weight 1 of the pendulum mechanism B shown in FIG. 2 is θ and the opening / closing force of the switch mechanism D is P, the relationship between the swing angle θ and the opening / closing force P (vertical stroke) is shown in FIG. 3 as indicated by the solid line a. That is, the opening / closing force P with respect to the deflection angle θ is a combined force of the spring force b of the movable contact piece 13 and the magnetic attraction force c of the magnet 11, and the spring force b of the movable contact piece 13 is smaller than the conventional spring force d. Even when the weight is reduced, the weight 1 of the pendulum mechanism B receives the above-described damping force due to the magnetic attraction force c of the magnet 11 from the initial position to a predetermined deflection angle θ2. Spring force P1
It is possible to set the same setting value as. Therefore,
According to the above configuration, if the swing angle .theta.1 for turning on the switch mechanism D is set within the swing angle .theta.2, which is the area where the movable disk 12 is attracted by the magnet 11, the switch mechanism can be turned on when the switch mechanism is turned on. In addition to preventing occurrence of chattering, the movable contact piece 13 in the switch mechanism D
, The speed of the ON operation can be increased based on the reduction of the spring force.

When the case A is attached at an angle, the automatic horizontal mechanism F rotates about the support point between the spherical portion 20a of the movable member 20 and the fulcrum member 19 as a fulcrum,
Due to the automatic horizontal action of the automatic horizontal mechanism F, the seismic sensor E
Is kept horizontal. That is, the center line b of the automatic horizontal mechanism F is vertical even when the case A is inclined. At this time, since the upper surface of the disk-shaped movable member 20 of the automatic horizontal mechanism portion F is in contact with the lower surface of the flexible thin film 23 of the viscous liquid damper portion G, the automatic horizontal mechanism portion F vibrates carelessly. Can be prevented. On the other hand, as described above, the pendulum mechanism B can rotate around the support point between the suspension portion 8 at the upper end of the suspension shaft 7 and the bearing seat 9a as a fulcrum, so that the center of the suspension shaft 7 The line a can be made coincident with the vertical center line b of the automatic horizontal mechanism F described above. Therefore, in a case where vibration exceeding a set value such as an earthquake is applied in such an inclined mounting state, the same seismic operation as in the above-described horizontal mounting state can be achieved.

As is apparent from the above, according to the above configuration, since the pendulum mechanism B and the automatic horizontal mechanism F are coaxially hung, the relative positions of the two mechanisms B and F in the horizontal direction are reduced. There is no significant displacement, and the switch mechanism D is kept open. Therefore, even if the case A is installed at an angle, there is no relative displacement of the two mechanism parts B and F in the horizontal direction unless the vibration such as an earthquake is applied to the switch mechanism D. There is no risk of malfunction by holding open.

Next, when a certain level of vibration such as an earthquake is applied, both the mechanism parts B and F try to perform a pendulum movement, but the damper part G controls the automatic horizontal mechanism part F. As a result, only the pendulum mechanism B moves in a seismic manner and relatively displaces in the horizontal direction with respect to the automatic horizontal mechanism F, thereby closing the switch mechanism D. As a result, the pendulum mechanism B is displaced in the horizontal direction relative to the automatic horizontal mechanism F, and the switch mechanism D is closed and the seismic operation can be performed. The size in the horizontal and vertical directions can be reduced without making the length of the weight 1 too large, and the overall size can be reduced from this point as well. Moreover, when the pendulum mechanism B makes a pendulum motion with the contact point between the annular bearing seat 9a and the suspension portion 8 as a fulcrum, the pendulum motion can be converted into a vertical swing motion of the movable disk 12. In response, the movable disk 12 swings in response to the pendulum movement in all directions around the fulcrum, and the switch mechanism D
Can be opened and closed. Therefore, one switch mechanism D can reliably and precisely perform the seismic motion in all directions around the fulcrum.

In the above embodiment, the damper G
Although a viscous liquid type is disclosed as an example, the same effect can be obtained by using an air damper.

[0025]

According to the present invention, it is possible to reduce the size as a whole, to perform a predetermined seismic operation accurately even if the mounting posture of the case is inclined, and to reduce the operation deviation due to the direction of vibration. It is possible to provide a seismic sensor which is small, has high reliability of seismic operation, and has high responsiveness.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a seismic sensor according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view for explaining a seismic sensing operation of the seismic sensor.

FIG. 3 is a characteristic diagram for explaining a seismic sensing operation of the seismic sensor.

[Explanation of symbols]

 Reference Signs List A Case B Pendulum mechanism C Motion conversion mechanism D Switch mechanism E Seismic section F Automatic horizontal mechanism G Damper section 1 Weight 7 Hanging shaft 8 Hanging section 9 Medium base 9a Bearing seat 11 Magnet 12 Movable disk

──────────────────────────────────────────────────続 き Continued from the front page (72) Norio Iwakiri, Inventor No. 10, Hanazono Todocho, Ukyo-ku, Kyoto, Kyoto Prefecture (56) References JP-A-57-10021 (JP, A) JP-A-61- 105427 (JP, A) JP-A-53-102787 (JP, A) JP-A-57-74625 (JP, A) Fully open 1986-48325 (JP, U) Really open, 55-21510 (JP, U) Japanese Utility Model Showa 55-114943 (JP, U) Japanese Utility Model Showa 55-119938 (JP, U) Japanese Utility Model Showa 55-28938 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01H 1/00 G01V 1/18

Claims (1)

(57) [Claims] (1) A case provided with an external fixed terminal, a pendulum mechanism having a weight installed in the case and having a pendulum motion, and converting the pendulum motion of the pendulum mechanism into a vertical motion. A motion conversion mechanism, a switch mechanism for converting the vertical motion of the pendulum mechanism converted by the motion conversion mechanism into an electric signal, and a pendulum mechanism, a motion conversion mechanism, and a switch mechanism when the case is tilted and mounted. A seismic sensor comprising: an automatic leveling mechanism for automatically holding the seismic part horizontally; and a damper part for imparting a vibration damping action to the automatic leveling mechanism. The motion conversion mechanism section includes a disc-shaped head formed at the upper end of the suspension shaft of the weight, a middle base formed with a bearing seat that pivotally supports the disc-shaped head, and the pendulum mechanism section. And the switch mechanism and Seismoscope, characterized in that it comprises a movable disc made of a magnetic material to convert the pendulum movement of the child mechanism up and down movement, is mounted on the in the base and Magunetsuto for sucking the movable disc.