JP2011022810A - Intruder sensor in governor base of city gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensor for sensing when there is an intruder in a governor chamber of a city gas. <P>SOLUTION: A sensor body 1 includes a moved pin 5 which progresses with a force of a coil spring 9 when unloaded and moves back into the sensor body 1 while compressing the coil spring 9 when loaded and a light reflector 8, wherein a light sensor 10 is attached to the sensor body 1 at a position opposite to the light reflector 8. The sensor 1 is attached to the governor chamber 20, senses by the light sensor 10 that a door 21 is opened when opened, a signal is sent to a monitoring circuit 19, and an alarm signal is transmitted to a control center by the monitoring circuit 19. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, when there is a person who enters the governor room in a governor room (box) that accommodates a governor attached to a pipeline for pressure regulation of city gas, this is detected and notified to the management center. The present invention relates to a sensor that is attached to a door of a governor room and used to make a call or alarm.

  The city gas supply pipeline (supply network) is equipped with governors at important points to regulate high pressure to medium pressure or medium pressure to low pressure. Yes. In this governor base, the governor is housed in a governor room as shown in Japanese Patent Application Laid-Open No. 2002-070171, and the doors of the entrances are locked so that only persons concerned can enter or leave the governor room. However, there is concern that someone will break in.

  And if it is mischievous by the governor, a gas accident may be caused. Therefore, a sensor for detecting an intruder is attached to the door of the conventional governor room.

Japanese Patent Laid-Open No. 2002-070171

  However, in the case of the conventional sensor, because the intruder detects the opening of the door by electrical means, if there is a gas leak, there is a risk that the sparks will ignite the leaked gas. was there.

  The present invention has been proposed in view of such points, and an object thereof is to provide an intruder detector in a city gas governor base that does not ignite even if a gas leaks. That is.

In order to achieve the above object, according to the first aspect of the present invention, in the intruder detector at the governor base of city gas, it moves forward by the force of the spring when no load is applied, and retracts into the case while compressing the spring when loaded. Attaching a driven pin to the sensor body and attaching a light reflector to a part of the driven pin located in the sensor body;
In the sensor body, an optical sensor is attached at a position facing the light reflector,
Attach the sensor body to the governor room side with the tip of the driven pin facing the open / close position of the governor room door, connect the optical sensor and the monitoring circuit with an optical fiber, and use the optical sensor when the door is opened. Detecting this, a signal is sent to the monitoring circuit, and an alarm signal is sent from the monitoring circuit to the management center.

  According to the present invention, since the opening operation of the door is detected by the light sensor that does not cause the spark, even if there is a gas leak in the governor room, there is no fear of ignition and it is safe.

  Furthermore, the invention according to claim 2 is the intruder detector in the governor base according to claim 1, wherein a screw hole is formed at the tip of the driven pin and the adjustment driven pin is screwed into the screw hole. Thus, the length of the driven pin is configured to be adjustable.

  According to the present invention, the position can be adjusted in accordance with the position and structure of the door in the governor room.

  Furthermore, in the invention described in claim 3, the intruder detector in the governor base described in claim 2 is characterized in that a cap nut with a huge portion is attached to the tip of the adjustment driven pin. It is.

  According to the present invention, since the corner of the tip of the adjustment driven pin does not hit the door, the door is damaged, or in the case of a hinged door, the movement of the door is smoothly transmitted to the adjustment driven pin side.

  Furthermore, the invention according to claim 4 is the intruder detector in the governor base according to any one of claims 1 to 3, wherein a light reflecting portion is provided on a part of the driven pin instead of the light reflector. It is characterized by being formed directly.

  According to the present invention, it is possible to reduce the labor and cost of attaching the reflector to the driven pin. However, depending on the material of the driven pin, it is conceivable that the reflectance decreases with the passage of time. Therefore, when it is put into practical use, it is necessary to consider measures against aging deterioration.

  Further, in the invention described in claim 5, in the intruder detector in the governor base described in claim 1, a calling circuit for calling an alarm in accordance with a notification from the management center is added to the monitoring circuit. It is characterized by that.

  According to the present invention, since an intrusion warning by a buzzer or the like is issued at the governor base, it becomes a threat to the intruder.

  According to the present invention, the sensor senses the opening operation of the governor room door by the optical sensor, and since this sensing means does not have an electric circuit, there is no fear of sparking like a conventional sensor having an electric circuit. There is no safety.

It is a front view of the sensor which concerns on this invention. FIG. It is sectional drawing in the state where a door is closed and the optical sensor is operating. It is a front view of an optical sensor. It is explanatory drawing of the state which removed the adjustment pin from the driven pin. It is explanatory drawing which shows an example of a governor room. It is explanatory drawing of the state which attached the sensor to the governor room. It is explanatory drawing of the example which attached the sensor which concerns on this invention to the sliding door.

  The sensor according to the present invention is mainly intended to detect intruders at a city gas governor base (governor box). It can also be applied to facilities that are not desirable to use.

  The sensor of the present invention is a door of a governor room or the like, and is used by being attached to a single-open, double-open, or sliding door type door.

  The sensor is installed in the governor room, and an alarm circuit (alarm device) is installed outside the governor room. This alarm circuit and the sensor in the governor room are connected by an optical fiber cable. A constant light signal is loaded on the light sensor.

  The driven pin of the sensor is pushed by the door when the door is closed, and the reflector has moved to the front surface of the optical sensor. As a result, the photosensor circuit is closed, and this state is a normal state.

  When the door is opened by an intruder, the driven pin moves forward by the force of the spring because the door escapes from the tip of the driven pin, and the reflector is detached from the front of the optical sensor by this action.

  As a result, since the photosensor circuit is opened, the alarm circuit that monitors the opened state is driven to notify the management center that an intrusion has occurred wirelessly or by wire.

  At this time, the alarm circuit simultaneously drives a buzzer or the like to issue an alarm sound.

  As the detector is often built differently for each governor room, an L-shaped bracket, etc., is prepared in advance and attached in an optimum state according to the situation at the site.

  Embodiments of the invention described in claims 1 to 5 will be described in detail with reference to FIGS.

  Reference numeral 1 denotes a quadrangle sensor body. A lid 2 is attached to the front surface with a screw 3. By removing the screw 3, the lid 2 can be removed to cope with internal maintenance. Reference numeral 4 denotes a screw hole for fixing the sensor body 1 to a bracket used when the sensor body 1 is mounted in the governor room.

  Reference numeral 5 denotes a driven pin that is assembled to the side surface of the sensor body 1 so as to freely enter and exit. A stopper 6 is formed at the tip 5a of the driven pin 5, and a screw hole extends from the center of the tip 5a in the axial direction. 7 is formed.

  In the driven pin 5, a reflector 8 made of stainless steel or the like having excellent light reflectivity is attached to the front surface of the rear end 5 b located in the sensor body 1. However, the side surface of the driven pin 5 may be formed smoothly and this may be used as a direct reflection surface.

  Reference numeral 9 denotes a coil spring that is biased in a direction in which the driven pin 5 is pushed out.

  An optical sensor 10 is attached from the front of the sensor body 1 toward the inside. The optical sensor 10 has a light emitting element 11 and a light receiving element 12 facing the reflector 8 as shown in FIG. When the reflector 8 moves to the front of the optical sensor 10 due to the retraction of the driven pin 5, the light emitted from the light emitting element 11 is reflected by the reflector 8 and received by the light receiving element 12, thereby causing an optical circuit. 13 and 14 are closed.

  Reference numeral 15 denotes an adjustment driven pin that is attached by screwing the screw portion 16 into the screw hole 7 formed at the tip of the driven pin 5 from the front, and has a positional relationship that cannot be handled by the length of the driven pin 5 at the site. Sometimes this adjustable driven pin 15 can be attached to adjust the length.

  Reference numeral 17 denotes a cap nut attached to the tip of the adjustment driven pin 15, and a round enormous portion 18 is formed on the end side of the cap nut 17, and this enormous portion 18 has a contact angle in contact with the door. Is intended to relieve this contact pressure when it is small, but is not necessarily required. In the case of a sliding door type in particular, it is hardly necessary, but of course it may be present.

  2 and 3, 19 is an alarm circuit, 20 is a governor chamber, 21 is a door attached to the entrance, and FIG. 2 is a state in which the door 21 is open, and the driven pin 5 is a coil spring. 9 is moving forward. On the other hand, FIG. 3 shows a state in which the door 21 is closed, the driven pin 5 is retracted, and the reflector 8 and the optical sensor 10 face each other (the optical circuits 13 and 14 are closed).

  FIG. 5 shows a state in which the adjustment driven pin 15 is removed from the tip of the driven pin 5.

  FIG. 6 is an external view of the governor room 20 to which the above-described sensor 1 is attached, and FIGS. 7A and 7B show a state in which the sensor 1 is attached in the governor room 20. 1 is fixed to an L-shaped bracket 22 using a screw hole 4, and the bracket 22 is attached to a side plate 25 of the governor chamber 20 with bolts 26 so that the driven pin 5 faces the door 21 side.

  7B, when the door 21 is closed, the driven pin 5 is pushed in to close the optical circuits 13 and 14 of the optical sensor 10, and when the door 21 is opened, the driven pin 5 is coiled. The optical circuits 13 and 14 of the optical sensor 10 are opened by being pushed out by the spring 8.

  FIG. 8 shows an example of a sliding door type attachment, in which a kick plate 27 is attached to the sliding door 26, and this kick plate 27 is attached to the tip of the adjustment driven pin 15 of the sensor 1 attached to the frame 28 of the governor chamber 20 with a bracket 29. The driven pin 5 is pushed by the adjustment driven pin 15 with the sliding door 26 closed.

  The mounting example of the sensor 1 described above is an example, and it corresponds by using brackets of various shapes according to the situation in the field.

Claims (5)

A driven pin that moves forward with the force of a spring when no load is applied, and is retracted into the case while compressing the spring when a load is applied, is assembled to the sensor body, and a part of the driven pin located in the sensor body is a light reflector. Attached,
In the sensor body, an optical sensor is attached at a position facing the light reflector,
Attach the sensor body to the governor room side with the tip of the driven pin facing the open / close position of the governor room door, connect the optical sensor and the monitoring circuit with an optical fiber, and use the optical sensor when the door is opened. An intruder detector in a city gas governor base configured to detect this, send a signal to the monitoring circuit, and send an alarm signal from the monitoring circuit to the management center.   2. The city gas governor according to claim 1, wherein the length of the driven pin is adjustable by forming a screw hole at the tip of the driven pin and screwing and attaching the adjustable driven pin into the screw hole. Intruder detector at the base.   The intruder detector at the governor base according to claim 2, wherein a cap nut with a huge portion is attached to the tip of the adjustment driven pin.   4. The intruder detector at the governor base according to any one of claims 1 to 3, wherein a light reflecting portion is directly formed on a part of the driven pin in place of the light reflector.   2. The intruder detector at the governor base according to claim 1, wherein the monitoring circuit is provided with a calling circuit for calling an alarm together with a notification to the management center.

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