JP3292560B2 - Seismic sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to detect seismic motion and to prevent various disasters from occurring, for example, a sensor mounted on various devices and devices such as a gas meter, an oil stove, an elevator, a chemical plant, and a railway. About tremors.

[0002]

2. Description of the Related Art As this type of seismic sensor, an inner casing in which a seismic ball is rotatably accommodated is provided inside an outer casing so as to be swingable and self-aligning so as to be capable of self-alignment. It is known to have a structure suspended in a state in which the swing is limited as much as possible.
When an earthquake occurs, a switch provided on the inner casing side is activated by the rolling of the seismic sphere to detect an earthquake.

In such a seismic sensor, it is necessary to send a signal related to the opening and closing of the switch from the inner casing side to the outer casing side. Therefore, the movable electrode provided on the inner casing side and the fixed electrode provided on the outer casing side. The electrodes are connected by lead wires.

Conventionally, the above-mentioned lead wire is generally constituted by a round wire having a circular section made of copper or the like, and both ends of the lead wire are respectively fixed to the above-mentioned electrodes by soldering.

[0005]

However, in the above-described seismic device, the inner casing is swingably suspended from the outer casing. Therefore, when the inner casing swings due to the occurrence of an earthquake or the like, the distance between the two electrodes is increased. The lead wire wrapped around the wire is deformed to generate stress, thereby deteriorating the lead wire.
In particular, since the end of the lead wire is fixed by solder, the vicinity of the soldered portion is largely deformed locally at the time of swinging, so that the stress is concentrated on the portion and disconnection may occur.

On the other hand, in order to prevent the lead wire from breaking,
It is conceivable that the lead wire is made of a material having high rigidity. However, when the rigidity of the lead wire is increased, the flexibility is reduced. Conversely, when the inner casing attempts to shift to the horizontal position by the self-aligning action, the resistance of the lead wire becomes large, and Is not smoothly performed, which may lead to a decrease in detection accuracy.

The present invention solves the above-mentioned problems of the prior art, and can effectively prevent not only the disconnection in the middle region of the lead wire but also the disconnection near the joint fixing portion on both sides, and the self-alignment action of the inner casing. It is an object of the present invention to provide a seismic device that can smoothly shift to a horizontal posture and improve detection accuracy.

[0008]

In order to achieve the above object, according to the present invention, there is provided a seismic sensor in which an inner casing in which a seismic ball is rotatably accommodated is capable of self-centering inside an outer casing. While one end of the lead wire is joined and fixed to a movable electrode provided on the inner casing side, the other end is joined and fixed to a fixed electrode provided on the outer casing side. In the seismic device, the lead wire may have a thickness of 0.02 mm to 0.05 mm and a width of 0.2 mm.
The gist of the present invention is that it is configured with a strip-shaped flat line of mm to 1.0 mm.

[0009]

In the seismic sensor according to the present invention, as a lead wire for connecting a fixed electrode provided on the outer casing side and a movable electrode provided on the inner casing side which can swing with respect to the outer casing, A strip-shaped flat wire is used.

For this reason, the lead wire of the present invention can increase the section modulus and have good flexibility even if the cross-sectional area is the same, for example, as compared with a conventional lead wire made of a round wire or the like. What you can get.

[0011]

1 is a sectional view showing an embodiment of the present invention, which is a seismic device suitably used for a gas meter, and FIG. 2 is an exploded perspective view of the seismic device.

As shown in both figures, this seismic sensor is rotatably housed in an outer casing (1), an inner casing (2) housed therein, and an inner casing (2). (3), a switch actuating section (4) including a small ball receiver (41) and a small ball (42), and a switch section (4) including a lower switch (51) and an upper switch (52). 5), an inner lid (6) mounted on the upper end of the inner casing (2), and an outer lid (7) mounted on the upper end of the outer casing (1).

On the upper part of the inner casing (2), a small ball receiver (41) formed on the lower surface side as a concave spherical surface having a larger radius of curvature than the seismic sphere (3) is provided with respect to the seismic sphere (3). Are fitted so as to be close to and separated from each other.

A plurality of small ball receiving holes (41a) are formed in the small ball receiving plate (41) at equal distances from the center thereof at equal intervals along the circumferential direction. A switch actuating ball (42) is vertically movably accommodated therein. Each of the small balls (42) has a hole (41) in its natural state.
When the seismic ball (3) rolls inside the inner casing (2) and comes into contact with the small ball (42), it is arranged so as to slightly protrude below the lower end opening of a). , The small ball (42) is lifted upward.

A lower switch (51) is provided on the upper surface of the small ball receiver (41). The lower switch (51)
Corresponding to the plurality of small balls (42), contact portions (51a) are respectively provided so as to protrude in the outer diameter direction, and each contact portion (51a) is attached to each small ball (42). It is arranged so that it may touch.

In addition, above the lower switch (51),
An upper switch (52) is provided so as to be close to and away from the lower switch (51). The upper switch (52) is provided with a contact portion (52a) connected to each contact portion (51a) of the lower switch (51) so as to protrude in the outer diameter direction.

Then, as described above, when the small ball (42) moves upward due to the rolling of the seismic ball (3), the contact portion (51a) of the lower switch (51) becomes the small ball (42). The contact portion (52) of the upper switch (52) is depressed and bent upward.
a) so that the switching of the switch section (5) is performed.

Further, both switches (51) and (52) include:
The movable electrode terminals (5
1b) and (52b) are provided in series, and the movable electrode terminals (51b) and (52b) are arranged in a state of being pulled out in opposite directions outside the inner casing (2).
The lead wires (8) and (8) connected to the leading ends of the movable electrode terminals (51b) and (52b) will be described later in detail.

The inner lid (6) mounted on the upper end opening of the inner casing (2) has a high-viscosity fluid accommodating recess (61) formed in the center of the upper surface thereof.
Is filled with a highly viscous fluid (x), and the lid (6)
2) is fitted.

The suspension shaft (63) inserted into the center hole of the lid (62) has a substantially hemispherical locking portion (63a) that locks on the lower surface side of the lid (62). The locking part (63a)
And a wing part (63b) provided below the inside of the high-viscosity fluid (63).

On the other hand, electrode terminals (51) of the switches (51) and (52) are provided on the outer surface of the peripheral wall of the outer casing (1).
b) and (52b), an electrode terminal mounting portion (11) is formed corresponding to each of the electrode terminal mounting portions (1).
In 1), bar-shaped fixed electrode terminals (12) and (12) are attached so as to penetrate vertically.

A pair of inner casing supporting pieces (13) (13) are formed on the outer surface of the peripheral wall of the outer casing (1) so as to protrude upward.
3) An inner casing suspending plate (14) is provided so as to span between (13) and (13).

Then, the inner casing suspension plate (14)
The upper end of the suspension shaft (63) is swingably attached to a middle portion in the longitudinal direction of the suspension shaft. Thus, the inner casing (2) is suspended in the outer casing (1) in a self-alignable state in which the axial direction is automatically made to coincide with the vertical direction by its own weight. At the time of swinging the inner casing, the high-viscosity fluid (63) acts as a resistance material against the swinging operation, thereby preventing the inner casing (2) from swinging due to inertial force and accurately maintaining a horizontal posture. It has been made to be.

As shown in FIGS. 3 and 4, the lead wires (8) are connected to the movable electrode terminals (51b) (52b) of the switches (51) (52) provided on the inner casing (2) side.
One end of (8) is joined and fixed by solder (9), and the other end of lead wires (8) and (8) is also connected to the upper end surfaces of fixed electrode terminals (12) and (12) on the outer casing (1) side. It is joined and fixed by solder (9).

As shown in FIG. 5, the lead wire (8) is composed of a flat wire made of a strip-shaped soft copper wire and plated with tin (Sn) for corrosion resistance.

The flat line has a thickness (t) of 0.02
mm or more and 0.05 mm or less can be used, and particularly those having a width of 0.03 mm or more and 0.04 mm or less can be suitably used.
Those having a length of from m to 1.0 mm can be used, and those having a length of from 0.3 mm to 0.5 mm can be suitably used.

That is, for the lead wire (8), it is necessary to secure a cross section of a predetermined size in order to accurately transmit and receive signals, but a wire having a thickness (t) of less than 0.02 mm is used. Then, the width (w) increases in order to secure a predetermined cross section, and it becomes impossible to secure a sufficient solder attachment area to the electrode terminals (12) (51b) (52b), which is not preferable. Further, if the thickness (t) exceeds 0.05 mm, the rigidity is increased, the flexibility is reduced, and there is a possibility that the self-alignment is hindered, which is not preferable. Similarly, if the width (w) is less than 0.2, the thickness (t)
Increases, the stiffness becomes too high and the width (w)
Exceeds 1.0 mm, a solder mounting area cannot be sufficiently secured, which is not preferable.

When both ends of the lead wire (8) having such a configuration are joined and fixed to the movable electrode terminals (51b) (52b) and the fixed electrode terminal (12), a marginal portion is formed in the intermediate region. Good. For example, there is a method of forming the clearance portion by loosening the middle region of the lead wire (8) or forming the middle region in a U-shape or a wavy shape.

According to this seismic sensor, the lead wire (8) for connecting the movable electrode terminals (51b) (52b) on the inner casing side and the fixed electrode terminals (12) (12) on the outer casing side. (8) Since a strip-shaped flat wire is used, for example, when compared with a conventional lead wire made of a round wire,
Even if the cross-sectional areas are the same, the section modulus can be increased and good flexibility can be obtained. For this reason, the inner casing (2) swings with respect to the outer casing (1) due to the occurrence of an earthquake, the passage of a vehicle, or the like, and the lead wire (8) between the two.
Even if stress is generated in the lead wire (8), the lead wire (8) can withstand the stress, and it is possible to effectively prevent not only the disconnection in the lead wire intermediate region but also the disconnection near the joint fixing portion on both sides. Further, when the inner casing (2) shifts to the horizontal position by the self-centering action, the resistance force by the lead wire (8) becomes small, and the shift to the horizontal position is performed smoothly, and high detection accuracy is obtained. be able to.

As shown in FIGS. 6 (a) and 6 (b), the soft material (10a) is used for fixing the lead wire (8) to the fixed electrode terminal (12) and the movable electrode terminal (not shown). Is applied so as to cover an area from the solder fixing portion of the lead wire (8) to the vicinity of the solder fixing portion,
Due to the elastic action of the soft material (10a), the vicinity of the solder fixing portion of the lead wire (8) is not locally deformed at the time of swinging, and the concentration of stress is avoided. Can be more effectively prevented.

As the soft material (10a), an adhesive or the like can be used, and any material having elasticity in a cured state can be used. For example, a silicone-based, synthetic rubber-based, urethane-based, resin-based adhesive, or the like can be suitably used.

As shown in FIGS. 7A and 7B, the fixed electrode terminal (12) on the outer casing side of the lead wire (8) is used.
In place of the solder, the conductive soft adhesive (10) is fixed to the movable electrode terminal (not shown) on the inner casing side.
In the case of b), in the same manner as described above, the vicinity of the joint fixing portion of the lead wire (8) at the time of swinging is not locally deformed, and concentration of stress is avoided, so that the lead wire (8) Disconnection can be more effectively prevented. further,
When compared with the end processing shown in FIG. 6, the end processing of the lead wire does not require a soldering operation, and thus can be easily performed.

As the conductive soft adhesive (10b), any adhesive can be used as long as it has elasticity when cured and has conductivity. Acrylic, epoxy, vinyl, modified urethane, and phenol-based ones can be suitably used. However, after the soldering, the periphery of the solder may be coated with the conductive soft adhesive (10b) as shown in FIG.

[0034]

According to the present invention, the lead for connecting the fixed electrode provided on the outer casing side and the movable electrode provided on the inner casing side which is swingable with respect to the outer casing is provided. As the wire is a strip-shaped flat wire, for example, when compared to a conventional lead wire made of a round wire,
Even if the cross-sectional areas are the same, the section modulus can be increased and good flexibility can be obtained. For this reason, even if the inner casing swings with respect to the outer casing due to the occurrence of an earthquake or a vehicle, and stress is generated in the lead wire between the two, the lead wire can withstand the above-mentioned stress, and the lead wire intermediate It is possible to effectively prevent not only the disconnection of the region but also the disconnection near the joint fixing portion on both sides. Furthermore, when the inner casing shifts to the horizontal position due to the self-aligning action, the resistance due to the lead wire is also small, so that the shift to the horizontal position is performed smoothly, and an effect that high detection accuracy can be obtained. can get.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of the shock absorber according to the embodiment.

FIG. 3 is a plan view showing the seismic device of the embodiment with an outer lid removed.

FIG. 4 is a perspective view showing a joint of lead wires in the seismic device of the embodiment.

FIG. 5 is a sectional view showing a lead wire of the seismic device of the embodiment.

FIG. 6 is a view showing a joint of lead wires in a seismic device according to a modification.

FIG. 7 is a view showing a joint of lead wires in a seismic sensor according to another modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Outer casing 2 ... Inner casing 3 ... Seismic ball 8 ... Lead wire 12 ... Fixed electrode terminal 51b, 52b ... Movable electrode terminal

Continuation of the front page (56) References JP-A-4-47683 (JP, A) JP-A-2-93734 (JP, U) JP-A-5-31165 (JP, U) JP-A-60-118815 (JP) , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01H 1/00 H01B 5/00 H01B 7/00

Claims (1)

(57) [Claims] An inner casing in which a seismic ball is rotatably accommodated therein is swingably accommodated in an outer casing so as to be capable of self-alignment, while one end of a lead wire is provided in an inner casing. The seismic sensor, which is joined and fixed to the movable electrode provided on the outer side and the other end is fixed to the fixed electrode provided on the outer casing side, wherein the lead wire has a thickness of 0.02 mm to 0.05 mm. And a strip having a width of 0.2 mm to 1.0 mm.