JPS6049243B2 - Manual return seismic sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seismic sensor that detects an earthquake or the like and opens and closes an electric circuit. detects an earthquake and changes the electric circuit from the state before the detection, and when the vibration stops and becomes stationary, it automatically returns to the state before the detection, and the inertial body can be returned to the state before the detection by manual operation. This paper proposes a new manual return seismic device.

Since the inertial body of a seismic device that uses a conductive liquid as its inertial body is a liquid, the inertial body itself and other parts that come into contact with it will not be damaged even by shocks received during transportation or handling. Since the inertial body undergoes perfect rolling motion, there is little loss and therefore the mass of the inertial body can be reduced.Since the inertial body is a liquid, it has a perfectly balanced shape due to surface tension, which reduces its sensitivity to all vibrations in the horizontal direction. Lack of directionality and inertia Since the body itself immediately acts as an electrical contact, it has many advantages such as fewer components and can be made small and inexpensive. Conventionally, there has been no known device that does not automatically return to the previous static state but instead preserves the state after sensing.

Depending on the device to which the seismic sensor is installed, automatic return type may not be convenient.For example, if a signal from the seismic sensor is applied to the safety device of the elevator and an earthquake with an acceleration higher than a specified value occurs, the elevator may be stopped from operating. For applications where it is mandatory to stop the elevator safely and after the earthquake subsides, inspect each part of the elevator system to confirm that there are no abnormalities, and then restart it. This is a problem because it cannot remember earthquakes that occurred during a power outage. The present invention provides a manual return seismic sensor using a conductive liquid as an inertial body suitable for the above-mentioned applications, and will be detailed below with reference to the drawings. Reference numeral 1 designates a nasal cover body made of a steel plate or the like, and a hole 1a formed by burring is provided approximately in the center, and an electrode rod 3 is hermetically sealed in the hole 1a by glass 4.

The outer periphery of the lid body 1 is a flange portion lf. 2 is a housing made by processing an iron plate, etc., and the flange part on its outer periphery.
f is airtightly joined to the flange part lf of the lid 1, and the two constitute a closed container.

The housing 2 is provided with a mounting portion 2a on which a conductive liquid 5 such as mercury is placed in a normal and stationary state. This mounting portion 2a is a substantially circular recess, and the level difference between its periphery and the bottom is determined depending on the magnitude of the vibration to be sensed. In the drawing, the area around the placing part 2a on the left side is continuous with the bottom part 2b located at a lower position than the placing part, and the part on the right side around the placing part 2a approaches the side wall 1b of the lid body 1. Teteko 1b
As will be described later, this portion will be referred to as a return wall as a guide surface that returns to the placing portion 2a when the conductive liquid 5 falls. An opening/closing electrode 3a is fixed to the end of the electrode rod 3 on the side of the closed container by welding or the like, and its sharp tip is in contact with the center of the conductive liquid 5. For example, the closed container is assumed to have a normal posture in which the flange portion 2f is horizontal with the flange portion 2f as a reference plane, and a base (not shown) is used to maintain this posture. In this state, when the device is stationary, the conductive liquid 5 resides on the placement portion 2a and does not move from there on its own.
Therefore, the space between the electrode rod 3 and the closed container is electrically closed. However, if horizontal vibration is applied due to an earthquake or the like, and the acceleration exceeds a predetermined value, the conductive liquid 5 will climb over the level difference around the mounting part 2a and fall to the most stable bottom part 2b shown by the dotted line. . At this time, the open/close electrode 3a and the conductive liquid 5 are separated, so that the electric circuit between the electrode rod 3 and the closed container is opened. Regarding the acceleration threshold when the conductive liquid 5 detects horizontal vibration and falls from the placement part 2a, as is clear from FIGS. 1 and 2, the placement part 2a in which the conductive liquid 5 is placed is a closed container. It is placed on the right side instead of in the center.

Therefore, any horizontal addition. In order to eliminate the directionality of the acceleration threshold value with respect to the velocity, the bottom surface of the mounting portion 2a is not necessarily horizontal, assuming that the sealed container is placed in the normal posture described above, and its planar shape is also approximately circular. As mentioned earlier, it may be preferable to make it slightly oval. difference. ”
In addition, the steps around the mounting portion 2a may be slightly inclined,
It is possible to adjust the sensitivity in the horizontal direction by eccentrically positioning the tip of the opening/closing electrode 3a that contacts the conductive liquid 5. After the conductive liquid 5 falls in the normal position of the closed container after being subjected to vibration acceleration of a predetermined value of 4 or more, when the earthquake, etc. subsides, this seismic sensor is returned to its original state, that is, the conductive liquid 5 is placed on it. In order to place the container on the portion 2a, the closed container may be tilted clockwise from its normal position.

The corner where the placing part 2a and the return wall 1b are in contact is the lowest, and the conductive liquid 5 that had fallen onto the bottom part 2b is at its lowest point. The position where the sealed container moves to is the return position of the sealed container, and if the container is gradually returned to its normal posture, that is, the shock sensing position from this return position, the conductive liquid 5 will remain on the mounting portion 2a and the state shown in FIG. 1 will be achieved. Become. As a means for making the closed container tiltable between the shock sensing position and the return position, for example, the rotation axis S is set as shown by the dotted line in FIG. A bearing hole for supporting the rotating shaft S may be provided in a base (not shown) by fixing the rotating shaft S to the closed container by an appropriate method. Providing the center of rotation near the mounting portion 2a is advantageous because the acceleration applied to the conductive liquid 5 is reduced when the sealed container is returned to the seismic gate position in a counterclockwise direction from the return position. Another embodiment of the invention is shown in FIGS. 3 and 4.

In the figure, a hole 11a for a hermetic seal is bored in the center of the lid 11. Therefore, the electrode 113 is made of glass 1
4 to the center of the lid 11. Housing 1
2 has a shape similar to a truncated cone, with a mounting part 12a provided in the center and a bottom part 12b located at a lower position from the periphery thereof, and the flange 11f of the lid body 11 and the flange part 12f of the housing 12 are joined. They are fixed together to form an airtight container. The return wall 12c is fixed to the housing 12 by an appropriate method, and the movement range of the conductive liquid 5 is limited to the left half space by the return wall 12c. There is no need to explain again the fall of the conductive liquid 5 due to vibrational acceleration at the earthquake sensing position and the movement of the conductive liquid 5 to the corner where the placement part 12a and the return wall 12c contact at the return position in this embodiment. Although omitted here, compared to the embodiments shown in FIGS. 1 and 2, the process of constructing a sealed container, that is, placing the lid 11 on top of the casing 12 and ring projection welding of each flange part, etc. This has the advantage that the electrode 13 can be easily positioned at the center of the mounting portion 12a when the electrode 13 is hermetically sealed and fixed. Still other embodiments of the invention are shown in FIGS. 5 and 6.

In the figure, the lid body 21 is simply a lid itself having a flange portion 21f. The housing 22 has a placing part 22a and a bottom part 2.
2b1 return wall 22c, hermetic seal hole 22d
and a flange 22f. The electrode rod 3 is sealed and fixed in the hole 22d via the glass 4. An electrically insulating tube 26 is fitted into the electrode rod 3, and an opening/closing electrode 3a is fixed near its upper end by welding or the like, and the tip of the opening/closing electrode 3a is in contact with the conductive liquid 5. In this embodiment, since the electrode rod 3 and the opening/closing electrode 3a are provided in the housing 22, not only the position of the tip of the electrode and the placement part 22a but also the mutual positional relationship between the conductive liquid 5 and the tip of the electrode are sealed. It has the advantage that it is possible to set the opening/closing electrode 3a in advance by bending and adjusting it to the most preferable positional relationship before sealing the container. The electrically insulating tube 26 is provided to prevent the conductive liquid 5 that has fallen due to a predetermined vibration acceleration from coming into contact with the electrode rod 3 when it rolls up the bottom portion 22b.

[Brief explanation of the drawing]

1, 3, and 5 are longitudinal sectional views showing different embodiments of the present invention. Figure 2 is a cross-sectional view taken in the direction of the arrow ■-■ in Figure 1, Figure 4 is a cross-sectional view taken in the direction of the arrow ■-■ in Figure 3, and Figure 6 is a cross-sectional view taken in the direction of the arrow ■-■ in Figure 3.
They are shown as a cross-sectional view in the direction of the arrow ■-■ in the figure. 1,
11, 21... Lid body, 2, 12, 22... Housing, 2
a, 12a, 22a...Placement part, 2b, 12b
, 22b...bottom, 1b, 12c, 22c...
Return wall, 3...electrode rod, 3a...opening/closing electrode, 13...electrode, 5...conductive liquid.

Claims (1)

[Claims] 1. A closed container equipped with an electrically insulated electrode and containing an appropriate amount of conductive liquid therein, the closed container being provided with a placing portion on which the conductive liquid resides when it is stationary; A part of the periphery is connected to a bottom part located at a lower position than the placing part, and another part of the periphery of the placing part is connected to a return wall that extends upward, so that the closed container itself becomes an earthquake sensing position. A manual return seismic device characterized by being tiltable between the return position and the return position.