JP3375870B2 - Seismic isolation valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-seismic shut-off valve provided in the middle of a gas pipe, and more particularly, to an anti-seismic shut-off valve for detecting a seismic signal or an impact signal. The present invention relates to a seismic isolation valve for shutting off a pipeline. 2. Description of the Related Art FIG. 3 shows a conventional seismic sensor, and FIG. 4 shows a seismic isolation valve to which the seismic sensor is attached. The seismic sensor 1 has a movable ball 14 provided in a pot 13.
When 4 moves to the position indicated by the dashed line, the movable contact 15 is pushed and comes into contact with the fixed contact 16 so that the switch is turned ON.
A horizontal (direction of arrow 17) swing is detected. A seismic isolation valve 7 equipped with such a seismic sensor 1 is attached to a gas pipe 5 as shown in FIG. 4. When the seismic isolation valve 7 is shaken, the valve closes and shuts off the pipeline. It has become. FIG. 5 shows a logical circuit diagram of a conventional seismic isolation valve. When an earthquake acceleration is applied to the seismic isolation valve 7, the seismic sensor 1 uses the vibration acceleration as an ON-OFF signal as a microcomputer unit. 4 is output. When the microcomputer unit 4 determines that an earthquake has occurred, the microcomputer unit 4 outputs a signal to the seismic isolation valve 7 to close the valve, thereby shutting off the valve and stopping the gas flow. . [0005] The seismic sensor (earthquake sensor) 1 as described above is easy to detect horizontal shaking, but is not suitable for vertical shaking. The seismic isolation valve 7 to which the seismic sensor 1 is attached is limited to an attachment posture in which the seismic isolation valve 7 is attached (upward) to the upper part of the horizontal gas pipe 5 as shown in FIG. (See FIG. 2A), or when mounted on a horizontal gas pipe in the upside down direction (see FIG. 2B), the seismic sensor 1 does not operate normally. Therefore, conventionally, the mounting posture of the seismic isolation valve 7 is restricted, and there is a problem that workability is not good. Further, in the conventional method, the seismic
, The magnitude of the vibration cannot be detected or recorded simply by recognizing the seismic vibration with the ON-OFF signal. Therefore, the magnitude of an impact other than an earthquake caused by a fall during transportation or construction, for example, cannot be sensed or recorded. Generally, seismic isolation valves that have been subjected to an impact during transportation or construction must be disabled for safety reasons.However, since the magnitude of the impact value cannot be detected in the past, it should be judged that the valve cannot be used more than necessary. There were many. The present invention has been made in view of the above points, has no restriction on the mounting posture, and can accurately detect not only the seismic signal but also other shock signals up to the magnitude, high detection accuracy, and safety. An object of the present invention is to provide an earthquake-resistant shut-off valve having excellent performance. [0008] In order to achieve the above object, the invention according to claim 1 is provided with a built-in vibration sensor for detecting vibration, and a valve is opened based on a signal from the vibration device. A seismic isolation valve provided in a gas piping system that is operated to shut off a gas flow, wherein the seismic sensor is an X-axis, a Y-axis.
Using a three-axis acceleration sensor that converts the absolute value of an acceleration signal output from the Z axis and the Z axis into a voltage value and outputs the voltage value, inputs the voltage value to a voltage determination circuit, and outputs an earthquake signal or a shock signal other than an earthquake. In the case of an earthquake signal, the galvanic value is calculated by an impact discriminating circuit and stored in the microcomputer unit, and when the galvanic value is equal to or greater than a specified value, the galvanic value is calculated based on the signal from the microcomputer unit. In the case of a shock signal, the shock value is calculated by the shock discriminating circuit, and the calculated value is stored in the microcomputer unit. with a warning on the display that shocked based on the signal
It is characterized in that the valve, which is closed at the time of shipment, cannot be returned . Therefore, according to the first aspect of the present invention, when the three-axis acceleration sensor receives an impact due to a shaking or a fall of an earthquake, a voltage value corresponding to the magnitude is sent from the three-axis acceleration sensor to the voltage determination circuit. Sent to the voltage judgment circuit.
It discriminates between shaking and shock due to an earthquake, and when it is determined to be shaking due to an earthquake, it is sent to an impact discriminating circuit to calculate the gull value. Close the valve. When a shock signal other than an earthquake is applied to the three-axis acceleration sensor, the voltage judgment circuit judges the shock signal based on a change in the voltage value, and stores the shock value calculated by the shock judgment circuit in the microcomputer. In addition, a warning is displayed on the display when the impact value is equal to or more than the specified value. [0011] By using a three-axis acceleration sensor,
An earthquake shake can be accurately detected regardless of the roll and the pitch, and the magnitude and direction of the shake can be detected, so that a highly safe seismic isolation valve can be obtained. The three-axis acceleration sensor has a solid angle of 360.
Since the degree can be detected, the sensing accuracy is not affected by the mounting posture of the seismic isolation valve, and the construction is facilitated. Further , according to the first aspect of the invention, for example, the seismic isolation valve is shocked during transportation or construction, and when the shock value is equal to or greater than a specified value, the closed valve cannot be returned and cannot be used. It becomes impossible state. Embodiments of the present invention will be described below with reference to the drawings. The same members or components having the same functions as those in FIGS. 3 to 5 are denoted by the same reference numerals. In FIG. 1, a three-axis acceleration sensor 10 is provided in place of a conventional seismic sensor 1 inside a seismic isolation valve 7 provided in a gas piping system. A decision circuit 3, a microcomputer unit 4, and a display 6 are built in. These electric circuit devices 10, 2, 3,
4, and 6 are driven by a power source such as a built-in dry battery. The three-axis acceleration sensor 10 has an X-axis, a Y-axis, and a Z-axis.
The absolute value G of the acceleration signal output from the axis is calculated by the following equation: G = √ (X ² + Y ² + Z ² ). When the three-axis acceleration sensor 10 receives an impact due to a shaking of an earthquake, a fall, or the like, the three-axis acceleration sensor 1
From 0, a voltage value corresponding to the magnitude (G) is output,
It is sent to the voltage judgment circuit 2. The voltage judging circuit 2 has a function of discriminating between shaking and impact due to an earthquake. That is, since the shaking of the earthquake has a slower period than the shock, its characteristics are used. Since the slow cycle of the earthquake appears as a change in the voltage value output from the three-axis acceleration sensor 10, the voltage determination circuit 2 determines that the signal is an earthquake signal based on the change in the voltage value. A signal determined by the voltage determination circuit 2 to be an earthquake;
That is, the earthquake signal is sent to the shock discrimination circuit 3, and the shock discrimination circuit 3 calculates the gull value of the earthquake. Gull value is, for example, 80
In the case of an acceleration range of up to 250 gal, the valve of the seismic isolation valve 7 is closed by a signal from the microcomputer unit 4. This gal value is stored in the microcomputer unit 4. A shock signal other than an earthquake is a three-axis acceleration sensor 1
When it is added to 0, the voltage determination circuit 2 determines a shock signal based on a change in the voltage value from the three-axis acceleration sensor 10 (the cycle is faster than the earthquake signal), and the shock value calculated by the shock determination circuit 3 is The information is stored in the microcomputer unit 4, and when the impact value at that time is equal to or greater than a specified value, a warning is displayed on the display 6 based on a signal from the microcomputer unit 4. For example, when a shock exceeding a specified value is received due to a drop during transportation, a drop during construction, or the like, a warning is displayed on the display 6 based on a signal from the microcomputer unit 4. With this display, it is possible to accurately determine whether the seismic isolation valve 7 that has been subjected to an impact before construction can be used. Preferably, the valve which is closed at the time of shipment upon receiving an impact equal to or more than a specified value is not reset even when the valve is reset after construction based on a signal from the microcomputer section 4. With this configuration, it is possible to prevent the use of the unusable seismic isolation valve that has been shocked during transportation or construction. The unrecoverable state can be determined, for example, by turning off the switch due to an abnormal shock and cutting off the electrical conduction state, thereby disabling the opening operation of the valve. 4, the microcomputer 4 rejects the return operation of the valve in response to a subsequent operation of returning the valve to disable the valve opening operation. Further, the microcomputer unit 4 has the above-described gal value,
In addition to the shock value, the direction of the earthquake or shock, date and time, etc. are stored as data. The data stored in the microcomputer unit 4 can be read directly from the microcomputer unit 4,
As shown by the broken line in FIG. 1, it is possible to read out from the setting device 8 and the communication controller 9 attached to the seismic isolation valve and display them on the display 6 . Therefore, by knowing the magnitude, direction, and date and time of the impact on the screen,
It is possible to analyze claims and manage devices. As described above, in this embodiment, since the three-axis acceleration sensor 10 is used as a seismic sensor (earthquake sensor), it is possible to accurately detect the shaking of the earthquake regardless of the roll and pitch. As shown in FIG. 2 (a), the horizontal direction is directed to the vertical gas pipe 5 along the wall surface 11 or the horizontal direction is directed to the horizontal gas pipe 5 along the ceiling 12 (downward) as shown in FIG. 2 (b). Even if it is attached to the, the seismic sensor operates normally and the installation is easy. Also, since the magnitude and direction of the sway (acceleration) can be detected, it is possible to determine the impact generated during transportation and construction.
An unusable seismic isolation valve 7 that cannot be used due to an impact can be accurately determined. The three-axis acceleration sensor 10 has a solid angle of 36.
Since 0 degree can be detected, the installation is facilitated without being affected by the mounting posture of the seismic isolation valve 7. As described above in detail, according to the first aspect of the present invention, the use of the three-axis acceleration sensor for the seismic sensor allows the earthquake to be performed regardless of the roll and the pitch. Since the magnitude and direction of the shaking can be accurately grasped and the impact before the construction can be displayed on the display as a warning, a highly safe seismic isolation valve can be obtained. Further, since the solid angle of 360 degrees can be detected, the sensing accuracy is not affected by the mounting posture of the seismic isolation valve, and the construction is facilitated. Furthermore, according to the first aspect of the invention, since the impact value of the previous construction has no return constructed a valve is closed at the time of shipment when the specified value or more, the impact during transportation and construction if example embodiment The use of the received unusable seismic isolation valve can be prevented beforehand. [0031]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a logic circuit diagram showing an embodiment of a seismic isolation valve of the present invention. FIGS. 2 (a) and 2 (b) are side views each showing a construction example of the seismic isolation valve of the present invention. FIG. 3 is an operation explanatory view of a conventional vibration sensor. FIG. 4 is a side view showing an example of implementation of a conventional seismic isolation valve. FIG. 5 is a logic circuit diagram of a conventional seismic isolation valve. [Description of Signs] 2 Voltage judgment circuit 3 Impact judgment circuit 4 Microcomputer unit 5 Gas pipe 6 Display 7 Seismic isolation valve 10 3-axis acceleration sensor (seismic sensor)

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Claims (1)

(57) [Claim 1] A gas having a built-in seismic sensor for detecting vibration, wherein a valve is operated based on a signal from the vibrator to shut off a gas flow. A seismic isolation valve provided in a piping system, wherein the seismic sensor is a three-axis acceleration sensor that converts an absolute value of an acceleration signal output from an X-axis, a Y-axis, and a Z-axis into a voltage value and outputs the voltage value. Use, the voltage value is input to the voltage determination circuit to determine whether the signal is an earthquake signal or a non-earthquake shock signal. If the signal is an earthquake signal, the galvanic value is calculated by the shock determination circuit, and the value is stored in the microcomputer unit. In addition, when the galling value is equal to or more than a specified value, the valve is closed based on a signal from the microcomputer unit. If the signal is a shock signal, the shock value is calculated by the shock discriminating circuit and the value is calculated. Stored in the microcomputer section , and the impact value is equal to or greater than a specified value. When a shock is received based on a signal from the microcomputer unit, a warning is displayed on a display and the product is closed at the time of shipment.
An anti-seismic shut-off valve characterized in that the valve is non- returnable.