JPH0772004A - Seismic sensor - Google Patents

Abstract

PURPOSE:To obtain a seismic sensor which facilitates the mounting with higher workability in production. CONSTITUTION:A hanging part 4 is provided on the seismic sensing element 2 and held being suspended by a support part 9A of a support 7. The seismic sensing element 2 is mounted on the support 7 outside a container. A lead pin 22 of the seismic sensing element 2 and a metal plate 21 are connected to connection terminals 8A and 8B of the support by leads 10A and 10B, respectively. After the mounting of the seismic sensing element 2 on the support 7, the support 7 is set at a specified position in the container 3, conducting terminals 5A and 5B are connected to the connection terminals 10A and 10B, and, the seismic element 2 is housed at a specified position. The container 3 is filled with a liquid 6 and an outer lid 11 is fixed on an opening of the container to form a closed container. This allows the minimizing the work in a narrow container in the mounting work of the seismic sensing element 2, thereby improving the workability in the production. In addition, if the inclination of the container 3 is within an allowable range in the mounting of the seismic sensor 1 on a device to be controlled, the gravity works on the seismic sensing element 2 to take a normal attitude, thereby facilitating the mounting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic sensor which is mounted on, for example, a combustion device and which generates a control signal when an earthquake or a fall occurs, and proposes a structure which does not require precise horizontal adjustment when mounting the seismic sensor. It is a thing.

[0002]

2. Description of the Related Art A conventional seismic sensor of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 61-160026.
Also, there is an “earthquake sensing device” disclosed in Japanese Utility Model Publication No. 62-36100. In the seismograph disclosed in Japanese Patent Laid-Open No. 61-160026, a device that emits an on / off signal when subjected to vibration such as an earthquake is floated in the container in which the liquid is enclosed, above the liquid surface and horizontally. In addition, the actual public Sho 62-36
In the earthquake sensing device of No. 100, an inner container having a vibration-sensing portion is mounted in a suspended or levitated state in an outer container filled with a liquid and sealed.

[0003]

However, the above-mentioned conventional example has the following problems. That is, JP-A-61
In the seismic sensor of -160026, the device which is the seismic element is only connected to the lead wire whose weight is negligible, and the device is a container because it floats above the liquid surface in a practically free state. There is no guarantee that it will be held in the center, and even if the container is in the normal state, the position of the device may deviate from the center, and the movement of the device may be restricted or affected by the wall of the container. Also, since the device is only floated above the liquid surface, if a device with a metal closed container is used, the internal space should be increased relative to its weight in order to obtain buoyancy. Since it is necessary to lighten the specific gravity above, in order to increase the size of the entire container, or conversely to make it smaller, it is necessary to reduce the plate thickness of the container and reduce the amount of mercury that is inertia mass. There is a problem that it is insufficient or stable characteristics cannot be obtained.

Further, in the seismic sensing device of Japanese Utility Model Publication No. 62-36100, since the outer container is filled with the liquid, it is difficult to handle at the time of enclosing.

In both of the conventional examples, a terminal for detecting the signal from the seismic sensor, etc., is attached to the lid of the outer container by attaching the inner container suspended or levitated via a universal joint or a lead wire. Since most of the members are attached to the lid, each member is unstable during assembly, and it is extremely difficult to attach a universal joint or attach a lead wire to a part where the process of installing the lid to the outer container, that is, the finished product is narrow. It is obvious that it will be difficult and the workability will deteriorate.

On the other hand, in the "simple installation type seismic sensor" disclosed in Japanese Patent Laid-Open No. 182527/1988, a suspending portion is provided on the seismic sensing element, and the suspending portion is a support provided on an outer box which is a container. By supporting the seismic sensitive element in place,
Even if no special work is performed to hold the support in the outer box by the holding portion provided on the outer lid, the outer lid is fixed and closed in the opening of the outer box to form a closed structure. The structure of the structure in which the support body is pressed down by the protrusion as the holding part on the lower central surface of the center of the box and is securely held in the predetermined position in the outer box, and the hanging part is always held in the predetermined position without coming off from the support body. A tremor is shown. Therefore, the seismic element can be attached to the inside of the outer box before the lid is attached, and since the outer box is provided with the electrodes and the like, the lead wires can be attached more easily than the above-described example. However, since the structure is such that the seismic element and the electrode are directly connected by the lead wire, it cannot be said that the workability has been sufficiently improved in terms of handling the thin lead wire inside the outer box.

[0007]

Therefore, the seismoscope of the present invention has a seismic element that generates an electric signal by vibration and a container that houses the seismic element, and the seismic element has a suspending portion. In a seismoscope provided in a container, in which a support for supporting the suspension part and for suspending and holding the seismic element in a normal posture is housed, the support body includes a support part for supporting the suspension part and a support part for supporting the suspension part. It is provided with a plurality of conductive connecting terminals, holds the seismic sensing element by engaging the suspension part with the supporting part, and has a strength that does not substantially affect the movement of the seismic sensing element in the normal posture. After connecting each end of the flexible conductive wire to the signal terminal of the seismic element and connecting and fixing the other end of each conductive wire to the connection terminal of the support, store the support in a predetermined position of the container. The seismic sensor and the conductive element are fixed by connecting and fixing the connection terminal to the conductive terminal fixed to the container. The position where the seismic sensitive element is suspended and held at the same time when it is electrically connected to the child is set to a predetermined position, and the mounting state of the seismic sensitive element can be confirmed before sealing before sealing the container, and then the viscous element in the container is viscous. It is characterized in that the container is sealed after injecting an appropriate amount of the selected liquid, connecting work of each member around the seismic element can be done outside the container, and work after storing the seismic element in the container Since it requires a minimum amount, even if it is composed of small parts, it provides a seismic sensor with excellent workability as compared with the conventional one.

[0008]

EXAMPLES Examples will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of the seismoscope of the present invention, and FIG. 2 is FIG.
It is a sectional view taken along the line A-A of the seismoscope. The vibration-sensing device 1 has a vibration-sensing element 2 made of a metal closed container and housed in a resin-made container 3.

The seismic sensing element 2 has a structure for opening and closing its electric contact by vibration or the like, and has a structure as shown in FIG. 3, for example. The seismic element 2 includes a lid plate 24 in which a conductive pin 22 serving as the other signal terminal portion is airtightly fixed to a hole formed in a metal plate 21 serving as one signal terminal portion by an electrically insulating filling material 23, and a metal housing. 25 constitutes an airtight container. A conductive ball 26 is housed inside the airtight container, and an electrode 27 is fixed to the inner end of the airtight container of the conductive terminal. The bottom surface of the housing 25 is shaped like a mortar, and the conductive ball 26 is located in the stable portion at the center of the housing 25 when it is in a normal posture and at rest.

When a vibration of a predetermined magnitude or more is applied to the vibration sensing element 2 due to an earthquake or the like, the conductive sphere 26 rolls on the bottom surface and comes into contact with the electrode 27. At this time, the conductive ball 26 electrically connects the electrode 27 and the housing 25,
Conductive pin 22-Electrode 27-Conductive sphere 26-Housing 25
The electric path is formed by the path of the metal plate 21. The hook 4 attached to the conductive pin 22 is a hanging portion described later.

As shown in FIG. 1, conductive terminals 5A and 5B are insert-molded in a resin container 3, one end of which projects from the bottom surface of the container so that it can be directly attached to a printed circuit board or the like of a control device. ing. Further, the container 3 is filled with the liquid 6 of which viscosity is selected at the same time that the seismic element 2 is housed. The vibration-sensing element 2 has a hook 4 that is a suspension portion supported by a support body 7, and normally has a normal posture when stationary.

The support 7 comprises a non-conductive base 7A such as resin, metal connection terminals 8A and 8B, and a hanger 9. The hanger 9 has a support 9A projecting from its central portion to the lower surface of the base 7A. The hook 4 of the seismic element is supported by the supporting portion 9A. In the present embodiment, the hanger 9 is a metal wire fixed in a groove provided in the base 7A, and a supporting portion 9A provided in the middle portion is projected to the lower surface of the base through a through hole formed in the base 7A. The connection terminals 8A, 8B of the support 7 are fixed to the base 7A, and one end of each of them is connected to the conductive terminals 5A, 5A of the container 3.
B, and the other end is connected to the conductive lines 10A and 10B.
The conductive wires 10A and 10B are thin conductive wires made of nickel or the like and are supple wires that do not substantially affect the movement of the seismic sensitive element 2. 10A is the conductive pin 22 of the seismic sensitive element 2, and 10B is the sensitive wire. It is connected to the cover plate 21 of the seismic element by welding or the like.

An outer lid 11 is fixed to the open end of the container 3 by ultrasonic welding or the like so as to have an airtight structure so that at least the liquid 6 does not leak out. It should be noted that the container 3 is provided with a locking portion 12 which is used for positioning and the like when the vibration sensor 1 is mounted on a printed circuit board or the like.

Explaining the operation of the seismoscope 1,
The seismic shock absorber 1 is attached to the control device of the control target device, etc., but at this time, if the inclination of the seismic shock absorber 1 is within an allowable range with respect to the normal posture, for example, within 5 degrees, it is suspended inside the seismic shock absorber 1. The seismic sensitive element 2 thus obtained is automatically made to have a normal posture due to gravity. The viscosity of the liquid 6 filled in the container 3 is set to be high to some extent for the reason described later, so that the posture correcting operation of the seismic sensing element 2 is performed at a slow speed while suppressing the shaking of the seismic sensing element itself. Since the normal posture is surely obtained, it is not necessary to be more nervous than necessary with respect to the attachment of the seismoscope 1. Of course, since the vibration-sensing element 2 is supported by the supporting portion 9A by the suspending portion 4, it does not come into contact with the inner wall of the container 3 within the allowable tilt range, and the posture correction operation of the vibration-sensing element 2 is restricted. Absent.

When vibration is applied to the seismoscope 1 due to an earthquake or the like, the same vibration as that applied to the container 3 is applied to the seismic element 2 due to the viscous resistance of the liquid 6.
The conductive ball 26 of the seismic element 2 rolls and comes into contact with the electrode 27 to form an electric path to generate an on-off signal. Therefore, even if the seismic sensing element 2 has a structure in which only one point is supported by the suspension part 4 and the support part 9A, the vibration due to the earthquake can be reliably detected.

The seismic sensor 1 facilitates its operation by performing most of the process of mounting the seismic sensor 2 outside the container 3. Explaining this point, the holder 7
As shown in FIG. 4, it comprises a non-conductive base 7A such as resin, connection terminals 8A and 8B formed by bending a metal plate, and a hanger 9. The connection terminals 8A and 8B hold one end of the lead wire and facilitate the connection work with the conductive terminals 5A and 5B of the container 3, and are fixed to the base 7A by caulking or welding by the connection terminal itself. .

The hanger 9 is a groove 7 provided in the base 7A.
It is a metal wire fixed to B, and a supporting portion 9A provided in the middle portion is projected to the lower surface of the base through a through hole 7C formed in the base 7A. Further, as shown in FIG. 2, the hanger 9 is fixed by crushing a part of the base 7A at two fusion points 7D of the base 7A.

In this embodiment, the groove 7B is provided obliquely to the center line of the base 7A. Therefore, it is possible to make the supporting portion 9A of the hanger 9 larger than that in which the groove 7B is provided on the center line of the base 7A, and even if the hanger 9 has a long overall length, it interferes with the connection terminals 8A and 8B. Absent. Further, since it is not necessary to make the hanger 9 smaller than necessary, handling and assembling work are facilitated, and the seismoscope as a whole can be downsized even if the size of the hanger 9 does not change.

The seismic element 2 is attached to the support 7 having the above-described structure.
As for the method of attaching the
A hook 4 which is a hanging portion is attached to the support portion 9 of the hanger 9 which projects the hook 4 from the lower surface of the support body 7.
The hook 4 of the seismic element is supported on A by almost point contact so that it can swing in any direction.

After the seismic sensing element 2 is attached to the support 7, lead wires 10A and 10B are connected to the seismic sensing element 2. The lead wires 10A and 10B are thin wires made of copper or nickel, for example, and are supple wires that do not affect the operation of the seismic sensing element 2. In this embodiment, the lead wire 10A is connected and fixed to the conductive pin 22 and the lead wire 10B is connected and fixed to the metal plate 21 by welding or the like. Each lead wire is made not to come into contact with other members, and is spirally wound around the central axis of the seismic element so as to prevent the seismic element 2 from moving or to give directionality. They are connected and fixed to the holding portions 8A ₁ and 8B ₁ of the connection terminals by caulking or soldering.

In this way, the assembly in which the seismic element 2 is supported by the support 7 and electrically connected to the connection terminal is held in the container 3. At this time, positioning is performed by inserting the conductive terminals 5A and 5B of the container 3 into the mounting holes 7E and 7E at both ends of the support body 7, and the seismic sensing element 2 is positioned substantially at the center of the container. The ends of the conductive terminals 5A and 5B on the inner side of the container are bifurcated, and the projections of the connection terminals 8A and 8B of the support are sandwiched between them. By connecting and fixing the conductive terminal and the connection terminal by caulking or soldering, the support 7 and the seismic sensing element 2 can be fixed in the container 3 before fixing the outer lid 11, and the electrical connection Since structural fixing can be performed at the same time, the process time can be significantly shortened.

After the seismic element 2 and the support 7 are housed in the container 3 as described above, the container 6 is filled with an appropriate amount of the liquid 6 and the outer lid 11
Is fixed to the opening of the container 3 by ultrasonic welding or the like to provide a closed structure in which at least the liquid 6 does not leak. Here, vibration may be concentrated in the central portion of the outer lid 11 during the entire circumference welding by ultrasonic waves, and the central portion may be melted and a through hole may be opened before the outer peripheral portion is welded. Therefore, in the embodiment, the thick portion 11 is formed so that the heat capacity near the center of the outer lid 11 becomes large.
A is provided so as to avoid a rapid temperature rise and melting of the vibration concentrated portion even during the entire circumference welding by ultrasonic waves.
Note that the method of fixing the outer lid 11 is not limited to ultrasonic welding as long as a closed container can be formed, and it goes without saying that, for example, a structure in which the container and the outer lid are screwed together can be used.

By connecting the members around the vibration-sensitive element outside the container in this way, the work after the vibration-sensitive element is stored in the container can be minimized, and the workability in assembly is improved. Will be very good. Further, since the seismic sensing element 2 can be mounted before the outer lid 11 is fixed to the container 3 and the container is hermetically sealed, the mounting state of the seismic sensing element can be confirmed before encapsulation.

In this embodiment, the metal hanger 9 is used as the supporting portion, but it does not have to be metal, and may be ceramic or resin as long as there is no problem in strength, workability and workability. Alternatively, for example, the hanger may not be formed as a separate body, and a hole may be provided in the lower portion of the base 7A so that the hanging portion 4 can be inserted therethrough.

Although the conductive terminal is projected to the lower end surface of the container as an example, the conductive terminal is mounted on a printed circuit board installed vertically or at an arbitrary angle by protruding the conductive terminal to the side surface of the container. It goes without saying that a seismic sensor that has been enabled may be used.

Further, the seismic element used in the seismoscope of the present invention is not limited to the one having the structure of this embodiment, and for example, a magnet and a magnetically responsive element such as a reed switch or a hall element. A piezoelectric device or the like may be incorporated, and the type thereof is not limited as long as an electric signal is generated by vibration.

[0027]

According to the present invention, since the connecting work of each member around the seismic element can be performed outside the container, even if it is composed of small parts, the parts can be easily handled, and the container can be easily handled. The work after the seismic element is stored in is minimized, which improves workability.

Further, according to the present invention, the support and the vibration-sensitive element can be mounted and fixed before fixing the outer lid, that is, before sealing the container, so that the mounting state of the vibration-sensitive element can be confirmed before enclosing. it can.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of a seismoscope according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of the seismoscope of FIG.

FIG. 3 shows an example of a seismic sensing element used in the seismic sensor of the present invention.

FIG. 4 is an exploded perspective view of an embodiment of a support of the seismoscope according to the present invention.

[Explanation of symbols]

 1: Sensitive device 2: Seismic element 3: Container 4: Hanging part 5A, 5B: Conductive terminal 6: Liquid 7: Support 8A, 8B: Connection terminal 9: Hanger 9A: Support part 10A, 10B: Lead wire 11 : Outer lid

Claims (1)

[Claims] 1. A seismic element for generating an electric signal by vibration and a container for housing the seismic element, wherein the seismic element is provided with a suspending portion, and the container supports the suspending portion. In a seismoscope in which a support body for holding a seismic element in a regular posture is housed, the support body includes a support portion that supports the suspension portion and two conductive connection terminals, and the support portion supports the suspension portion. The seismic sensitive element is held by engaging with the seismic sensitive element, and each end of the flexible conductive wire is made strong enough not to substantially affect the movement of the seismic sensitive element in the normal posture. Part, and the other end of each conductive wire is connected and fixed to the connection terminal of the support, and then the support is housed in a predetermined position of the container and the connection terminal is connected and fixed to the conductive terminal fixed to the container. By doing so, the seismic sensitive element and the conductive terminal are electrically connected and at the same time the seismic sensitive element is suspended and maintained. A seismoscope characterized in that the position to be held is a predetermined position, and an appropriate amount of liquid having a selected viscosity is injected into the container and then the container is sealed.