JP5099032B2 - Gas shut-off device - Google Patents

Description

  In the present invention, when a plurality of devices are connected on a communication line connected to the gas shut-off device, the communication is automatically stopped when the communication line is short-circuited, and automatically when the short-circuit is released. Thus, by resuming communication, unnecessary communication is not performed according to the state of the communication line.

Conventionally, this kind of gas shut-off device has connected the gas shut-off device and equipment (T-NCU) as shown in FIG. Further, as shown in FIG. 5, when the voltage value signal converted by the voltage level detection circuit 21 does not coincide with the normal voltage value signal by making Tr1-4 a predetermined combination, the communication line Some are configured to detect that the connection state of 3a and 3c is at least one of a disconnection and a short circuit. Then, the communication line is short-circuited for the gas shut-off device, and when it is determined that it is in a short-circuit state, the retry communication is automatically stopped to the center device (see, for example, Patent Document 1).
Japanese Patent No. 3468904

  However, in the conventional configuration, as shown in FIG. 4, only one device (T-NCU) is connected on the communication line, and the case where a plurality of devices are connected is not disclosed. Accordingly, there is a problem that accurate short-circuit detection cannot be performed in a state where a plurality of devices are connected on the communication line.

  For example, in a state where the gas shut-off device and the devices A and B are connected to the same communication line, the gas shut-off device checks the communication line based on the contents disclosed in Patent Document 1. After determining that communication is not being performed, the determination of the presence or absence of a short circuit is started. However, since the process for determining whether or not the gas shut-off device is short-circuited is assumed only when the gas shut-off device and the device (T-NCU) are not communicating with each other, it is estimated that devices other than the gas shut-off device are in a communicable state. Is done. Therefore, there is a possibility that inter-device communication is performed between the device A and the device B before the short circuit determination is finished. However, Patent Literature 1 does not disclose a case where communication between devices is started during short-circuit determination. On the other hand, it is disclosed that the voltage at the point A is determined by a voltage level detection circuit. In order to realize the determination of the voltage level detection circuit, it is generally considered to use A / D conversion. However, when the A / D circuit is used, the communication signal levels of the device A and the device B tend to be leveled, and the level of the leveled voltage depends on the content of the communication data of communication between devices during the short circuit determination. It is estimated that it is erroneously determined as a disconnection or a short circuit by exceeding or not exceeding.

  The present invention solves the above-mentioned conventional problems. When a short circuit is determined, the presence or absence of communication between the devices A and B is directly determined, and the short circuit is detected when the communication between the devices A and B is detected. By stopping the determination, an object is to perform an accurate short-circuit determination even when a plurality of devices are connected on a communication line.

  In order to solve the above-described conventional problems, the gas shutoff device of the present invention distinguishes between the open state, the short state, and the congestion state of the communication line A in the short circuit detection unit.

As a result, even when the gas shut-off device, the device A, and the device B are connected to the same communication line, the device-to-device communication between the device A and the device B overlaps with the short-circuit presence / absence determination of the gas shut-off device. When the state of congestion and congestion is detected, it is possible not to reflect the result of the determination of the presence or absence of a short circuit.

  The gas shut-off device of the present invention is a device other than the gas shut-off device when determining whether or not the gas shut-off device is short-circuited even when the gas shut-off device and the devices A and B are connected on the same communication line. Can be detected when they are communicating with each other. In addition, since it can be realized with a simple circuit configuration that does not require a voltage level detection circuit, it is possible to reduce current consumption and to reduce the cost, and to achieve both power saving and convenience.

  According to a first aspect of the present invention, there is provided a flow rate detection unit that outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage, a flow rate calculation unit that calculates a flow rate when receiving the flow rate signal of the flow rate detection unit, and the flow rate When the calculation unit obtains the flow rate, it compares with an abnormality determination flow rate that is held in advance, and determines whether there is an abnormality and outputs a valve closing drive signal and an abnormality information signal when it is determined to be abnormal. A determination unit; a valve driving unit that outputs a closing signal when receiving the valve closing drive signal of the abnormal flow determination unit; a valve that closes a gas passage when receiving the closing signal of the valve driving unit; and the abnormal flow rate When the abnormality information signal of the determination unit is received, the abnormality information communication request signal is not output if the short circuit signal of the short circuit detection unit is received, and the abnormality information is not received if the short circuit signal of the short circuit detection unit is not received. Communication request An abnormality notification unit that outputs a signal, an external communication unit that outputs an abnormality notification signal to the communication line A upon receipt of the abnormality information communication request signal of the abnormality notification unit, and whether or not the communication line A is periodically short-circuited. When the communication line A is confirmed to be short-circuited, the short-circuit detection unit outputs the short-circuit signal, so that the short-circuit detection unit determines whether or not the communication line A is short-circuited. Thus, it is possible to stop communication with a device that has been performed wastefully during a short-circuit state and retry communication that has been automatically performed at a predetermined interval when the communication fails.

  When the second invention receives a short-circuit signal from the short-circuit detection unit, it periodically starts an operation for confirming that the communication line A is not in a short-circuit state, and when it is determined that the communication line A is not in a short-circuit state, When the short-circuit release detection unit that stops the operation for confirming that the short-circuit state is not output and the short-circuit release signal of the short-circuit release detection unit are received, the confirmation operation that the communication line A is in a short-circuit state periodically When the communication line A is determined to be short-circuited, the short-circuit detection unit that outputs the short-circuit signal and stops the confirmation operation of the short-circuit state and abnormality information of the abnormal flow rate determination unit When the signal is received, if the short circuit signal of the short circuit detection unit is received immediately before, the abnormality information communication request signal is not output, and if the short circuit release signal of the short circuit cancellation detection unit is received immediately before, the abnormality Telecommunications By providing an abnormality notification unit that outputs a solicitation signal, the short-circuit release detection unit periodically checks whether the short-circuit state has been repaired after the communication line A is short-circuited. When it is determined that the condition has been repaired, permission to resume communication can be automatically implemented.

  According to a third aspect of the present invention, an external operation input unit that outputs a short-circuit determination request signal when an input by an external operation is detected, and at the time of receiving the short-circuit determination request signal of the external operation input unit, the gas cutoff device is a communication line A If the communication line A is not short-circuited, the communication line A is immediately checked for the presence or absence of a short-circuit, and if it is determined that the communication line A is short-circuited, a short-circuit signal is output. Alternatively, the communication line A is regularly checked by checking whether the communication line A is short-circuited, and when the communication line A is determined to be short-circuited, a short-circuit detection unit that outputs the short-circuit signal is provided. When an external operation input is received at an arbitrary timing separately from the timing at which it is performed, it is possible to immediately determine whether or not there is a short-circuit state.

  According to a fourth aspect of the present invention, an external operation input unit that outputs a short-circuit determination request signal when an input by an external operation is detected, and at the time of receiving the short-circuit determination request signal of the external operation input unit, the gas cutoff device is a communication line A If it is determined that the communication line A is not in a short-circuited state, the operation immediately confirms that the communication line A is not in a short-circuited state. Stop confirming that it is not in a state. Alternatively, when a short circuit signal is received from the short circuit detector, a check operation is periodically started to confirm that the communication line A is not in a short circuit state, and when it is determined that the communication line A is not in a short circuit state, a short circuit release signal is output. At the time of receiving the short circuit determination request signal of the external operation input unit and the short circuit release detecting unit that stops the operation of confirming that it is not in a short circuit state, if the communication line A is not short circuited, The operation for confirming that the communication line A is in a short-circuited state is started. When it is determined that the communication line A is short-circuited, the short-circuit signal is output and the operation for confirming that the communication line A is in a short-circuited state is stopped. . Alternatively, when the short-circuit release signal is received from the short-circuit release detection unit, a check operation is periodically started to confirm that the communication line A is in a short-circuit state, and it is determined that the communication line A is short-circuited. By providing the short-circuit detection unit that outputs the short-circuit signal and stops the operation of confirming the short-circuit state, immediately after receiving an external operation input at an arbitrary timing separately from the periodically performed timing, the short-circuit state The presence / absence determination can be performed.

  In the fifth invention, when the abnormal information signal of the abnormal flow rate determining unit is received, if the short circuit signal of the short circuit detecting unit is received, the abnormal information communication request signal is not output and the communication line A is short-circuited. The added second abnormality information communication request signal is output, and if the short circuit signal of the short circuit detection unit is not received, the abnormality information communication request signal is output, and the information indicating that the communication line A is short circuited is added. 2 An abnormality notification unit that does not output an abnormality information communication request signal, and a second external communication unit that outputs a second abnormality notification signal to the communication line B when the second abnormality information communication request signal of the abnormality notification unit is received. Thus, the communication line B can be notified when the communication line A is in a short circuit state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a functional block diagram of a gas cutoff device in Embodiment 1 of the present invention.

  In FIG. 1, the flow rate detection unit 31 may detect a gas flow rate from a difference in propagation time of an ultrasonic wave by attaching an ultrasonic sensor facing the gas passage (for example, an ultrasonic sensor facing the gas passage, A gas flow path may be created in the gas passage, and the gas flow rate may be detected from vibrations that occur when the gas flows through the gas path. The gas flow rate is measured each time the gas flow rate is measured and reaches a certain flow rate. Even if it is detected, the same effect can be obtained).

  When the flow rate calculation unit 32 receives the flow rate signal A of the flow rate detection unit 31, the flow rate calculation unit 32 calculates the flow rate B by multiplying the flow rate signal A by a coefficient with a weight for the flow rate signal A held in advance. May be calculated).

  When the abnormal flow rate determination unit 33 acquires the flow rate B of the flow rate calculation unit 32, the abnormal flow rate determination unit 33 determines whether or not there is an abnormality by comparing with the previously determined abnormality determination flow rate, and the abnormal flow rate is permitted by the gas shutoff device (for example, When the maximum gas usage is exceeded, or when it is judged as abnormal when it exceeds the usable time determined for each arbitrary gas usage derived from the flow rate B, the valve is closed. The signal C and the abnormality information signal E (for example, information whose usable time has exceeded) are output.

  When the valve drive unit 34 receives the valve closing drive signal C from the abnormal flow rate determination unit 33, it outputs a closing signal D and outputs an opening signal K that receives the valve opening drive signal J from the external communication unit 37. The valve 35 closes the gas passage when it receives the closing signal D of the valve drive unit 34 and opens the gas passage when it receives the opening signal K.

  When the abnormality notification unit 36 receives the abnormality information signal E from the abnormal flow rate determination unit 33 and receives the short circuit signal H from the short circuit detection unit 38, the abnormality information communication request signal F (for example, information that has exceeded the usable time). If the short circuit signal H of the short circuit detector 38 is not received, the abnormal information communication request signal F is output.

  When the external communication unit 37 receives the abnormality information communication request signal F from the abnormality notification unit 36, the external communication unit 37 outputs an abnormality notification signal G (for example, a telegram to which information whose usable time has exceeded) is added to the communication line A. When an abnormality notification signal G is output to the communication line as shown in FIG. 2, for example, when the device B is a T-NCU (the same effect can be obtained even with a device that relays communication such as a radio device) It is notified to the center device that monitors the gas shutoff device via a public communication line such as a line (the same effect can be obtained if the communication infrastructure is a dedicated communication line or the Internet). If the abnormality notification signal G notified by the center device is analyzed and the problem is solved (for example, the gas user has been informed that the fan heater has been used for a long time, the result is that the gas user has been inquired) For example, when the use of is stopped, a plug opening instruction signal is transmitted from the center device to the gas shut-off device, and the valve open drive signal J is output from the external communication unit 37 to remotely open the gas shut-off device.

  For example, as shown in the system configuration diagram of FIG. 2, the external communication unit 37 is connected to the gas cutoff device, the device A, and the device B on the same communication line, and each device can freely communicate with other devices (for example, between devices) For example, a device identification code can be placed at the beginning of communication data or at an arbitrary location in order to enable a gas cutoff device and device A, a gas cutoff device and device B, and all combinations such as device A and device B). By inserting it, even if various inter-device communications are being communicated on the same communication line, they can be identified from each other.

  The short-circuit detection unit 38 may be periodically (for example, once a day because the possibility of short-circuiting is low, or the interval may be shortened as necessary. In addition, when the communication between devices is performed, it is constant. It may be after the period, or the same effect can be obtained immediately before the gas shutoff device tries to perform communication instead of periodically).

  FIG. 3 is a schematic diagram showing communication / short-circuit determination, but FIG. 3 (a) describes the communication / short-circuit determination configuration of the gas shut-off device. Although not shown, the device side also has the same communication circuit configuration. The transmission enable on the device side is connected to CN1 via a communication line.

  For example, as shown in FIG. 2, when trying to communicate with the device A from a gas shut-off device connected to the same communication line, a transmission enable terminal (OUT1) which is a microcomputer terminal on the gas shut-off device side in FIG. When the transmission enable output is performed by changing the signal from the high level to the low level, the transistor Tr10 is turned on and the CN1 is set to the high level. Then, by switching the transmission output terminal (OUT2) to High / Low, the transistor Tr12 is turned on / off, and communication data can be transmitted to the device A side.

Conversely, when trying to communicate from the device A to the gas shut-off device, the transmission enable terminal (corresponding to OUT1) on the device A side is changed from High level to Low level, so that CN1 becomes High level via the communication line. The transmission output terminal (corresponding to OUT2) on the device A side is High / Low to transmit the communication data, so that the transistor Tr11 on the gas cutoff device side is turned on / off via CN1, and the reception input terminal Low / High is input to (IN1) and communication data can be acquired.

  However, if the communication line A is short-circuited (any of the communication lines between CN1 and CN2 and its extension line, or short-circuited on the circuit on the device side), CN1 always falls to GND through CN2. Since the transistor Tr11 on the gas cutoff device side is turned OFF because of the Low level, the reception input terminal (IN1) is always at the High level (power supply voltage). Even when communication from the device A side is not performed, since the transmission enable on the device A side is not output, the reception input terminal (IN1) on the gas cutoff device side is always at the high level. Further, when communication is performed from the device A side, the transmission enable on the device A side is output, but since CN1 falls to GND through CN2, CN1 is always at the low level, and the reception input terminal on the gas cutoff device side (IN1) is always at a high level. For this reason, it is a structure which does not know whether the communication line A is short-circuited by the presence or absence of the communication of the apparatus A.

  Therefore, in order to detect a short circuit of the communication line A, if the short circuit is not short, the transmission condition (OUT1) on the gas cutoff device side is set to the low level by setting CN1 to the high level. If not short-circuited (open state), the waveform as shown in FIG. 3B (transmission enable (OUT1) is set to low level, the transistor Tr10 is turned on, the transistor Tr11 is also turned on, and the reception input (IN1) is low. If it is short-circuited (short-circuited), the transistor Tr10 is turned on when the waveform (transmission enable (OUT1) is set to low level) as shown in FIG. 3C, but CN1 falls to GND through CN2. Since it becomes Low level and the transistor Tr11 is turned OFF, the reception input (IN1) is High. It is possible to detect the presence or absence of a short circuit by the the level).

  By the way, when communication between devices is performed from device A to device B as shown in FIG. 2 while the gas shut-off device determines whether or not the short circuit has occurred while the communication line A is not short-circuited, Since both the device and the device A output the transmission enable and the transmission output terminal on the device A side is High / Low, the waveform (congestion state) as shown in FIG. The signal is input to the reception input terminal (IN1) of the shut-off device. Therefore, the gas shut-off device itself outputs the transmission enable (for example, the response communication from the device is prevented from occurring by making the communication enable with a short time so as not to start communication with the device) during the input terminal. If the input of (IN1) is not fixed at the high level or fixed at the low level, it is possible to detect that communication between devices has been performed, and when the communication between devices is detected, the short-circuit determination at that time is stopped (inter-device communication is performed). It is possible to determine that there is no short circuit, or it is determined that the chattering is in the half short circuit state because the communication between the devices itself is received and it is not determined that the communication is correct. By performing the short-circuit presence / absence determination again after a short interval (for example, after 1 minute), the congestion state can be removed and the presence / absence of the short-circuit can be accurately determined.

  When it is determined that the communication line A is short-circuited, a short-circuit signal H (for example, a pulse-like signal may be used, or an equivalent effect can be obtained even if output is performed while the short-circuit continues). Output.

  As described above, in the present embodiment, the short-circuit detection unit 38 can determine whether or not the communication line A is short-circuited except for the congestion state, and the abnormality notification unit 36 detects the abnormality information communication request signal F during the short-circuit state. Communication to a device (center device) that has been performed wastefully because it is not output, and retry communication that has been automatically performed at a predetermined interval (for example, every 5 minutes) when the communication fails can be stopped. (In addition, the short circuit detection function is necessary for devices on the same communication line).

(Embodiment 2)
The gas shut-off device according to the second embodiment of the present invention will also be described using the functional block diagram of FIG. 1, but the external operation input unit 40 and the second external communication unit 41 are not included in the second embodiment and are therefore excluded. Think.

  When the short circuit release detection unit 39 receives the short circuit signal H from the short circuit detection unit 38, the short circuit release detection unit 39 may be performed periodically (for example, once a day because construction is required to cancel the short circuit state, and the interval may be changed according to need. The operation for confirming that the communication line A is not in a short-circuit state (the operation for confirming that the communication line A is not in a short-circuit state) is “a waveform that is not short-circuited (open state) as shown in FIG. When the transmission enable (OUT1) is set to the low level, the transistor Tr10 is turned on, the transistor Tr11 is also turned on, and the reception input (IN1) is set to the low level). ” When the communication line A is determined not to be in a short-circuit state, a short-circuit release signal I is output, and the communication line A is not in a short-circuit state. To stop the 認動 work.

  When the short-circuit detection unit 38 receives the short-circuit release signal I from the short-circuit release detection unit 39, the short-circuit detection unit 38 may be periodically (for example, once a day because the possibility of a short-circuit is low, and the interval may be shortened as necessary. In addition, the communication line A may be short-circuited after a certain period of time when communication between devices is performed, or the same effect can be obtained immediately before the gas shut-off device tries to perform communication, not periodically). The operation for confirming the state (the operation for confirming the short-circuit state is “If the circuit is short-circuited (short-circuited)”, the waveform (transmission enable (OUT1) shown in FIG. Tr10 is turned on, but CN1 falls to GND through CN2 and becomes a low level, and transistor Tr11 is turned off, so that the reception input (IN1) becomes a high level. In the following description of the embodiment, it is also referred to as a short-circuit confirmation operation), and when it is determined that the communication line A is short-circuited, the short-circuit signal H is output and the short-circuit state is output. The confirmation operation is stopped.

  When the abnormality notification unit 36 receives the abnormality information signal E from the abnormal flow rate determination unit 33, the abnormality notification unit 36 outputs the short circuit signal H of the short circuit detection unit 38 immediately before (either one of the short circuit signal H or the short circuit release signal I is output). If it is received (that is, if the state of the gas shut-off device is not in the current state of the actual communication line A but in the short circuit state), the abnormal information communication request signal F is not output and the short circuit release detection is detected immediately before If the short circuit release signal I of the unit 39 has been received (that is, if the state held by the gas shut-off device is not the short circuit state, not the actual state of the actual communication line A), the abnormality information communication request signal F is output. To do.

  As described above, in the present embodiment, it is determined whether the short-circuit state has been repaired after the communication line A is short-circuited by the short-circuit release detection unit 39 (for example, T -If the NCU fails and the communication line A is short-circuited, the short-circuit state can be corrected by replacing the T-NCU). In such a case, permission to resume communication is automatically obtained (as shown in FIG. 2, for example, when a plurality of devices such as a gas shut-off device and device A and device B are connected to the same communication line, for example, device B Is a T-NCU that has failed due to a lightning strike, and if the device A does not have the same short-circuit release determination process as the gas shut-off device, both the gas shut-off device and the device A are short-circuited, but the T-NCU is replaced and the short-circuited state Automatically recovers after The device A that does not have the function to continue will continue the short-circuited state, so it is necessary to release the short-circuited state held by the device A by some means, but the builder who replaced the T-NCU Assuming that device A does not recognize the existence of device A or forgets to cancel it because it was installed away from the T-NCU, it is automatically connected to the communication line to have a short-circuit release detection function. It is an effective function in a situation where it is used, and is a function that is also necessary for the device side).

(Embodiment 3)
The gas shutoff device according to the third embodiment of the present invention will also be described with reference to the functional block diagram of FIG. Think.

  The external operation input unit 40 detects an input by an external operation (for example, when a return switch (such as a push switch or a reed switch) provided in the gas shut-off device is pressed) or a short-circuit release provided exclusively for the gas shut-off device If the same effect can be obtained by dedicated communication such as a switch or a setting device), a short circuit determination request signal L is output.

  When the short circuit detection unit 38 receives the short circuit determination request signal L from the external operation input unit 40, if the gas shutoff device determines that the communication line A is not short-circuited, it immediately determines whether or not the communication line A is short-circuited. When it is confirmed that the communication line A is short-circuited, a short-circuit signal H is output. Or the presence or absence of the short circuit of the communication line A is confirmed regularly, and when it determines with the communication line A being short-circuited, the short circuit signal H is output. Thereafter, for example, if the construction worker carries out communication between the gas cutoff device, the device B and the device, it can be immediately determined whether or not it is in a short-circuit state.

  As described above, in the present embodiment, when an external operation input is received at an arbitrary timing in addition to a periodically performed timing, the presence or absence of a short-circuit state is immediately determined (for example, a gas cutoff device is connected to a communication line). If the communication line A is short-circuited during the operation of connecting to A, it is not possible to detect that the gas shut-off device is in a short-circuit state simply by periodically determining whether or not the short-circuit is present. It is possible that a worker who is in a short-circuit will end the work without noticing that it is short-circuited and leave the construction site, so confirm the short-circuit condition immediately by forcibly instructing the presence or absence of a short-circuit. Can).

(Embodiment 4)
The gas shutoff device according to Embodiment 4 of the present invention will also be described with reference to the functional block diagram of FIG. 1, but the second external communication unit 41 is not included in Embodiment 4 and will be excluded.

  The external operation input unit 40 detects an input by an external operation (for example, when a return switch (such as a push switch or a reed switch) provided in the gas shut-off device is pressed) or a short-circuit release provided exclusively for the gas shut-off device If the same effect can be obtained by dedicated communication such as a switch or a setting device), a short circuit determination request signal L is output.

  When the short circuit cancellation detection unit 39 receives the short circuit determination request signal L from the external operation input unit 40, if the communication line A is short-circuited by the gas cutoff device, the communication line A is not immediately short-circuited. When it is determined that the communication line A is not in a short-circuit state, a short-circuit release signal I is output, and the confirmation operation that the communication line A is not in a short-circuit state is stopped.

  Alternatively, when the short circuit signal H is received from the short circuit detection unit 38, a check operation is periodically started to confirm that the communication line A is not in the short circuit state, and when it is determined that the communication line A is not in the short circuit state, the short circuit release signal I is output. , Stop the operation to confirm that it is not in a short-circuit state.

  When the short circuit detection unit 38 receives the short circuit determination request signal L from the external operation input unit 40, if the communication circuit A is not short-circuited by the gas cutoff device, it is confirmed that the communication line A is in a short circuit state. When the operation is started and it is determined that the communication line A is short-circuited, the short-circuit signal H is output, and the confirmation operation of the short-circuit state is stopped.

  Alternatively, upon receipt of the short-circuit release signal I from the short-circuit release detection unit 39, a check operation is periodically started to confirm that the communication line A is in a short-circuit state, and if it is determined that the communication line A is short-circuited, the short-circuit signal H is output, and the confirmation operation for the short-circuit state is stopped.

  As described above, in this embodiment, when an external operation input is received at an arbitrary timing in addition to a periodically performed timing, the presence or absence of a short-circuit state is immediately determined (for example, the gas cutoff device is connected to the communication line A). If the communication line A is short-circuited during the operation of connecting to the gas shut-off device, it is not possible to detect that the gas shut-off device is in a short-circuit state simply by periodically determining whether or not the short-circuit is present. It is possible that a construction worker who has been short-circuited will not be aware of it and will end the work and leave the construction site, so it is possible to immediately confirm the short-circuit state by forcibly instructing the presence or absence of a short-circuit. In addition, it can be seen that a short circuit has occurred, and after the builder has corrected the short circuit, it can be confirmed that it is no longer short circuited, and the gas shut-off device is maintained. To which state it is possible to instruct a decision of forcibly short existence in order to not short-circuit state) can.

(Embodiment 5)
A gas cutoff device according to Embodiment 5 of the present invention will also be described with reference to the functional block diagram of FIG.

  When the abnormality notification unit 36 receives the abnormality information signal E from the abnormal flow rate determination unit 33 and receives the short circuit signal H from the short circuit detection unit 38, the abnormality information communication request signal F (for example, information that has exceeded the usable time). The second abnormal information communication request signal M added with information indicating that the communication line A is short-circuited (for example, information whose usable time has exceeded and the communication line A is short-circuited) Request that the communication is a mix of information). If the short circuit signal H of the short circuit detector 38 has not been received, the abnormality information communication request signal F is output, and the second abnormality information communication request signal M to which information indicating that the communication line A is short-circuited is not output.

  When the second external communication unit 41 receives the second abnormality information communication request signal M from the abnormality notification unit 36, the second external communication unit 41 outputs the second abnormality notification signal N to the communication line B (independent of the communication line A) (the communication protocol is communication). (It may be the same as or different from the line A).

  As described above, in the present embodiment, the fact that a short circuit has occurred up to now could not be notified to the center device that is monitoring the gas cutoff device because communication was not possible in the first place, but the communication line A is in a short circuit state. In such a case, it is possible to notify the center device or the like of the short circuit state by informing through the communication line B. In addition, when the short circuit state of the communication line A and the communication line B is reversed, the abnormality information communication request signal F and the second abnormality information communication request signal M of the abnormality notification unit 36 are output in a combination of the presence or absence of output corresponding to the short circuit state. It becomes.

  As described above, the gas shut-off device according to the present invention is a device between the devices that occurred during the short-circuit presence / absence determination, when the conventional short-circuit presence / absence determination could not be performed when a plurality of devices were connected to the communication line. By separating communication as a congested state and not reflecting it as a result of short-circuit presence / absence determination, accurate short-circuit presence / absence determination can be performed, and by using a simple circuit that does not require a voltage level detection circuit, battery consumption is reduced. It is possible to reduce power consumption and reduce the cost, and it is possible to secure power saving and convenience, so if the gas is replaced with electricity or water, it can be used for electricity meters and water meters. Is also applicable.

Functional block diagram of a gas shut-off device in an embodiment of the present invention System configuration diagram of the gas shut-off device Schematic showing communication / short circuit judgment of the gas shutoff device System configuration diagram of a conventional gas shut-off device Communication / short-circuit judgment configuration diagram of a conventional gas shut-off device

31 Flow rate detection unit 32 Flow rate calculation unit 33 Abnormal flow rate determination unit 34 Valve drive unit 35 Valve 36 Abnormality notification unit 37 External communication unit 38 Short circuit detection unit 39 Short circuit release detection unit 40 External operation input unit 41 Second external communication unit

Claims (5)

A flow rate detection unit that outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage, a flow rate calculation unit that calculates a flow rate when receiving the flow rate signal of the flow rate detection unit, and the flow rate of the flow rate calculation unit An abnormal flow rate determination unit that outputs a valve closing drive signal and an abnormal information signal when determining whether or not there is an abnormality by comparing with an abnormality determination flow rate that is held in advance when acquired, and the abnormality A valve drive unit that outputs a closing signal when receiving the valve closing drive signal of the flow rate determining unit, a valve that closes a gas passage when receiving the closing signal of the valve driving unit, and the abnormal information of the abnormal flow rate determining unit When the signal is received, the abnormality information communication request signal is not output if the short circuit signal of the short circuit detection unit is received, and the abnormality information communication request signal is output if the short circuit signal of the short circuit detection unit is not received. A normal notification unit, an external communication unit that outputs an abnormality notification signal to the communication line A upon receipt of the abnormality information communication request signal of the abnormality notification unit, and periodically checks whether the communication line A is short-circuited, When it is determined that the communication line A is short-circuited, the short-circuit detection unit that outputs the short-circuit signal is provided, and the short-circuit detection unit determines whether the communication line A is short-circuited. Gas shut-off, characterized by using a battery that can stop the communication to the equipment that has been carried out in vain and the retry communication that was automatically carried out at a predetermined interval when the communication fails apparatus. When a short-circuit signal is received from the short-circuit detection unit, a check operation is periodically started to confirm that the communication line A is not in a short-circuit state, and when it is determined that the communication line A is not in a short-circuit state, a short-circuit release signal is output. When the short-circuit release detection unit that stops the confirmation operation of the short-circuit release and the short-circuit release detection unit receives the short-circuit release signal, the communication line A is periodically started to confirm that the communication line A is in a short-circuit state, and the communication When it is determined that the line A is short-circuited, the short-circuit signal is output, and when the short-circuit detection unit that stops the confirmation operation of the short-circuit state and an abnormal information signal of the abnormal flow rate determination unit are received, If the short circuit signal of the short circuit detection unit is received immediately before, the abnormality information communication request signal is not output, and if the short circuit release signal of the short circuit cancellation detection unit is received immediately before, the abnormality information communication request signal is output. The short-circuit state is repaired by periodically checking whether the short-circuit state has been repaired after the communication line A is short-circuited by the short-circuit release detection unit. The gas cutoff device according to claim 1, wherein permission to resume communication is automatically executed when it is determined that When an external operation input unit that outputs a short-circuit determination request signal when an input by an external operation is detected and the short-circuit determination request signal of the external operation input unit are received, it is assumed that the communication line A is not short-circuited. If there is a short circuit, the communication line A is immediately checked for the presence or absence of a short circuit. If it is determined that the communication line A is short, a short circuit signal is output. Or the presence or absence of the short circuit of the said communication line A is confirmed regularly, and when it determines with the said communication line A being short-circuited, the short circuit detection part which outputs the said short circuit signal is provided, and it implements regularly. 2. The gas shut-off device according to claim 1, wherein immediately after receiving an external operation input at an arbitrary timing separately from the timing, the presence or absence of a short-circuit state is determined. When an external operation input unit that outputs a short-circuit determination request signal when an input by an external operation is detected and the short-circuit determination request signal of the external operation input unit are received, the gas shut-off device assumes that the communication line A is short-circuited. If the communication line A is not short-circuited, a confirmation operation is immediately started. If it is determined that the communication line A is not short-circuited, a short-circuit release signal is output to confirm that the communication line A is not short-circuited. To stop. Alternatively, when a short circuit signal is received from the short circuit detector, a check operation is periodically started to confirm that the communication line A is not in a short circuit state, and when it is determined that the communication line A is not in a short circuit state, a short circuit release signal is output. At the time of receiving the short circuit determination request signal of the external operation input unit and the short circuit release detecting unit that stops the operation of confirming that it is not in a short circuit state, if the communication line A is not short circuited, The operation for confirming that the communication line A is in a short-circuited state is started. When it is determined that the communication line A is short-circuited, the short-circuit signal is output and the operation for confirming that the communication line A is in a short-circuited state is stopped. . Alternatively, when the short-circuit release signal is received from the short-circuit release detection unit, a check operation is periodically started to confirm that the communication line A is in a short-circuit state, and it is determined that the communication line A is short-circuited. The short-circuit detection unit that outputs the short-circuit signal and stops the operation of confirming that it is in a short-circuit state, and immediately receives an external operation input at an arbitrary timing separately from the timing that is periodically performed, whether or not a short-circuit state exists The gas cutoff device according to claim 1, wherein the determination is performed. When the abnormality information signal of the abnormal flow rate determination unit is received, if the short circuit signal of the short circuit detection unit is received, the abnormality information communication request signal is not output, and the second abnormality information to which information indicating that the communication line A is short-circuited is added. Output a communication request signal, output the abnormality information communication request signal if the short circuit signal of the short circuit detection unit has not been received, and add the information indicating that the communication line A is short-circuited The second abnormality information communication request signal And a second external communication unit that outputs a second abnormality notification signal to the communication line B upon receipt of the second abnormality information communication request signal of the abnormality notification unit. The gas shut-off device according to any one of claims 1 to 4, wherein a notification is given by the communication line B in a short-circuit state.

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