JP6420161B2 - Electric valve device - Google Patents

Description

  The present invention relates to an electric valve device.

As a conventional electric valve device, for example, there is one described in Patent Document 1 in FIG.
This motor-operated valve device is provided between the outflow pipe 5 and the main distribution pipe 6 of the distribution basin / regulatory basin 4 and is for preventing the loss of drinking water.
In this motor-operated valve device, the motor-operated valve 2 is connected to the control panel 1 via a connection cable 3. An external power source (AC) 7 and a seismic device 8 are arranged on the control panel side. The control panel 1 and the motor-operated valve 2 are electrically connected by cables (electric power and signals) 3 and 3 'for remote control. Further, a backup power source 13 is provided in the control panel 1 to cope with power failure.
Here, there is a steel ball type conventionally used as the seismic device 8. In this seismic sensing device 8, as shown by the chain line in FIG. 9, the steel ball 9 falls from the ball receiver 10 to the tray 11 in the event of an earthquake, and the dropped steel ball 9 lowers the tray 11 to turn off the micro switch 12. (Open).
At this time, if the contact a is used as the detection output of the microswitch 12, for example, there is a possibility of malfunction due to noise as a detection signal. Therefore, in general, a pull-up resistor and contact b are used as shown in FIG. Current is always applied (active low).
By the way, the motor-operated valve 2 is often installed in a place where maintenance and inspection work is difficult, for example, embedded in the vicinity of the flow path. Therefore, the cable 3 may be disconnected or disconnected during maintenance inspection (mainly cleaning or valve replacement).
Thus, when the cable 3 is disconnected or disconnected, the same signal as that when the seismic device 8 is operated is input to the motor-operated valve side because the seismic device 8 uses the b contact. For this reason, the motor-operated valve 2 performs an emergency operation in response to an earthquake.
Further, when the cable 3 that has been disconnected or disconnected is used for power transfer, the power is lost, so the motor-operated valve 2 may be operated in an unintended manner. For example, in the spring return type motor-operated valve 2, it is conceivable to perform an unexpected shut-off operation by a spring.
As one method for solving this problem, a backup power supply 13 is arranged on the motor-operated valve side to cope with disconnection or disconnection of the power transfer cable, and for example, a maintenance inspection switch is provided on the control panel 1. It is conceivable that the switch and the motor-operated valve 2 are connected by a cable so that the input of the seismic device 8 on the motor-operated valve side can be temporarily turned off by an on / off signal of the switch.
However, in such an on / off type switch, in order to cope with a failure that causes the switch to be in an open state, a current is always supplied using the pull-up resistor and the b contact as described above. Therefore, the b contact of the switch is normally turned on (during operation), and the a contact is turned on when “maintenance inspection” is operated.

JP-A-8-4924

  However, in the case of using an on / off (open / close) type switch as described above, there is a difference between when the switch is turned on at the maintenance and inspection side of the contact a and when the cable is disconnected or disconnected due to an earthquake or the like. Be the same. Therefore, there is a problem that emergency operation cannot be performed as “maintenance inspection” even if the cable connecting the switch is disconnected or disconnected due to an earthquake or the like.

  Therefore, an object of the present invention is to distinguish between cable disconnection and disconnection due to maintenance inspection and cable disconnection and disconnection due to an earthquake so that an emergency operation can be performed in the event of an earthquake, and maintenance inspection work is also safe. Is to be able to do it.

  In order to solve the above-described problems, the present invention provides a motor-operated valve device that activates a motor-operated valve by starting a backup power source when connection with the control panel is interrupted. A code signal transmission means is provided to transmit one of the two codes (symbols) during operation and maintenance / inspection work to the motor-operated valve side at regular intervals. Means for discriminating between the two codes received during operation and maintenance and inspection work received by the receiving means and the operation of the motorized valve when the connection between the control panel and the motorized valve is disconnected based on the output of the identifying means A configuration is provided in which canceling means for canceling is provided.

By adopting such a configuration, the code signal transmission means transmits one of the two code signals during operation and maintenance / inspection work to the motor-operated valve side at regular intervals in accordance with the operation of the control panel.
By doing so, signals other than the two code signals (including no signal) can be detected by assigning them to the disconnection due to the earthquake so that an emergency operation can be performed.
On the other hand, the identification means identifies whether the received signal is a code indicating that the signal is in operation or a code indicating maintenance work. If the identified output is a code indicating a maintenance / inspection work, the canceling means cancels the operation of the motorized valve until the code indicating the operation is recognized, so that the cable can be removed during the maintenance / inspection work. Even if a disconnection occurs, the motor-operated valve does not operate so that safe work can be performed.

  At this time, instead of the code signal transmitting means for transmitting the two codes, the control panel side is provided with an oscillating means for transmitting signals of two different frequencies corresponding to the operation and the maintenance inspection work, and the motor operated valve Instead of the identification means on the side, a configuration is adopted in which a discrimination means for discriminating two frequencies and a cancellation means for canceling the operation of the motor-operated valve based on the output of the discrimination means are employed.

  By adopting such a configuration, either one of two different frequency signals corresponding to the operation and the maintenance inspection operation according to the operation of the control panel is transmitted to the motor-operated valve side at a constant interval. In this way, no signal (other than two frequencies) can be detected by assigning it to a disconnection (interruption) due to an earthquake so that an emergency operation can be performed. On the other hand, the discriminating means discriminates whether the received signal is a frequency indicating that the signal is in operation or a frequency for performing maintenance and inspection work. When the identified output is a frequency indicating that the maintenance / inspection operation is in progress, the canceling unit cancels the operation of the motor-operated valve until the frequency indicating that the operation is in progress is discriminated. By doing so, it is possible to perform a safe operation against the disconnection or disconnection of the cable during the maintenance inspection work.

  At this time, it is possible to employ a configuration in which a communication line for transmitting a code signal or a frequency signal is provided between the control panel and the motor-operated valve.

  By adopting such a configuration, if the communication line is along a power cable or a signal cable, it can be applied to an existing one.

  Instead of the communication line, it is possible to adopt a configuration in which a code signal or a frequency signal is superimposed on a power line connecting the control panel and the motor-operated valve.

  By adopting such a configuration, it is not necessary to provide a communication line for detecting disconnection, so that the construction is easy and the cost can be reduced.

According to the present invention configured as described above, it can be discriminated whether the disconnection of the cable is caused by maintenance or inspection work or an earthquake.
As a result, emergency operations can be performed in the event of an earthquake, and maintenance and inspection can be performed safely.

Block diagram of the embodiment Action explanatory drawing of the principal part of the embodiment Action explanatory drawing of the principal part of the embodiment Block diagram of backup power supply Action explanatory diagram of the embodiment Action explanatory drawing of Example 1 Block diagram of the first embodiment Block diagram of the second embodiment Schematic diagram of seismic device Prior art block diagram

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 shows an electric valve device to which the present invention is applied.
In the motor-operated valve device, the control panel 20 and the motor-operated valve 21 are connected via a connector by a signal cable 22, a power cable 23, and a communication cable 24. The motor-operated valve 21 is embedded in a manhole, for example, a water pipe Open and close. The seismic device 25 and the communication means 26 are provided on the control panel side, and the motor-operated valve body 27, the communication means 28, the control means 29, and the backup power source 30 are provided on the motor-operated valve side.

  The control panel 20 is provided with an AC power source (external power source) 31, a remote control switch, instruments, and the like, and is installed in a place with a good operating environment such as a building away from the motorized valve 21.

The seismic sensing device 25 is, for example, of the steel ball type described with reference to FIG. 9, and in the event of an earthquake, the steel ball 9 drops from the ball receiver 10 to the receiver 11, lowers the receiver 11, and switches the microswitch 12. Turn off (open).
The seismic device 25 is disposed at a place suitable for observing earthquakes away from the control panel 20. Therefore, the arranged seismic device 25 is connected to the signal cable 22 by wiring the output of the microswitch 12 to the control panel 20 at the relay point with a cable 22 'as shown in FIG.
By the way, the output of the signal cable 22 connected to the b-contact of the microswitch 12 is “L”, which is the normal output that the seismic sensing device 25 does not detect an earthquake shake, and operates by detecting the earthquake shake. The output at that time is “H” by pull-up.

  The communication unit 26 is a communication device that conforms to a communication standard such as RS-232, RS-485, or IEEE 802.3 / 502.3. Here, it functions as a code signal transmission means. Then, depending on the operation, one of two codes (for example, character codes) of “in operation” and “in maintenance / inspection work” is sent to the motor-operated valve side via the communication cable 24 at regular intervals. Send. Therefore, here, the communication means 26 is provided with a switch S1 as shown in FIG. 1, and two codes can be selected by operating the switch S1.

  On the other hand, the motor-operated valve body 27 of the motor-operated valve 21 has a motor and an output shaft 33 connected through a plurality of gears, and a valve body (here, a disc-shaped gate valve) 33 is attached to the tip of the output shaft 32. Although not shown, two cams are attached to the output shaft 32 with a phase difference of 90 degrees, two micro switches are engaged with the cams, and connected to the control circuit 29 '. The fully closed and fully open state of the body 33 can be detected.

The motor-valve-side communication means 28 is a communication device that complies with, for example, the RS-232, RS-485, or IEEE 802.3 / 502.3 communication standards, and communicates on the control panel side via the communication cable 24. It is connected to the means 26, and here functions as a receiving means. The received data is sent to the control means 29.
The control means 29 is a control circuit 29 ′ of an electric valve device provided with an identification means 35 and a cancellation means 36. Although not shown in the figure, the signal cable 22 and the power cable 23 are connected to the control circuit 29 ′. ing.
The control circuit 29 ′ is a circuit that controls the opening degree of the valve element 33 based on an instruction from the control panel 20, and a pull-up input 37 is connected to the seismic device 25 as shown in FIG. When the input 37 becomes “H” level due to the operation of the seismic device 25 or the disconnection of the signal cable 22, the valve body 32 is set to a safe opening degree (not limited to full closing) that does not cause inconvenience downstream or upstream. Transition to emergency operation to control. For example, in this embodiment, a shut-off operation is performed in which the motor is operated to fully close the valve element 33.
The identification means 35 reads the data received by the communication (reception) means 28, identifies the two codes “N” and “T” “in operation” and “maintenance work”, and digitally outputs the identified output. The signal is output to the canceling means 36 as a signal. For example, “N (operating)” → “1 (H)”, “T (maintenance / inspection work)” → “0 (L)” is output.
Here, as shown in FIG. 3, the canceling means 36 is a gate circuit (an AND gate is provided externally to the signal input circuit from the seismic device 25 of the control circuit 29 '. 38 may be incorporated in the control circuit 29 '). Here, an AND circuit is used for the gate circuit 38, and one input of the AND circuit is connected to the microswitch 12 of the seismic sensing device 25. The other input of the AND circuit is connected to the identification unit 35, and a digital signal based on the identification output from the previous identification unit 35 is input.
In addition to this method, for example, the canceling means 36 may be a method of controlling the motor so as to stop the valve element 33 in the current state.
Incidentally, the identification means 35 and the cancellation means 36 can be configured by a microcontroller or the like having an input / output function such as UART that can be used as the communication means 28 described above. For this reason, it is possible to deal with software without depending on hardware.

The backup power source 30 is a rechargeable battery (including a capacitor) and is charged by an AC power source 31 supplied by a power cable 23. The method uses, for example, a trickle charging method as shown in FIG. In this way, a power failure is detected by the power failure detection circuit (relay in FIG. 4) 40, and power is supplied from the battery to the electric valve side (electric valve main body 27, control circuit 29 ′, etc.).
Here, the secondary battery is used as the backup power source 30, but the present invention is not limited to this. For short-term or one-time use, a simple configuration using a primary battery may be adopted.

This configuration is configured as described above. During normal operation, the switch S1 of the communication means (code signal transmission means) 26 of the control panel 20 outputs the code “N” for “normal operation”. The motorized valve 21 is operated by operating as described above. By doing so, a code “N” signal is transmitted from the code signal transmitting means 26 ′ at a cycle T 1 as shown in FIG. This is received by the communication (reception) means 28 of the motor operated valve 21, and the received signal is identified by the identification means 35.
When the identified code is “N”, the identifying unit 35 outputs “1” and opens the gate circuit 38 to invalidate the canceling unit 36. Therefore, the electric valve 21 is controlled by operating the control panel 20.
For this reason, when the seismic device 25 is actuated by an earthquake and an “H” level signal is output from the seismic device 25, the motor-operated valve 21 has a safe opening degree (the motor-operated valve 11 that does not cause inconveniences upstream or downstream). The operation proceeds to an emergency operation in which the opening is controlled to any opening.
Further, when the signal cable 22 is disconnected due to an earthquake, the signal is interrupted, and the input 37 of the control means 29 in FIG. At this time, even if the power cable 23 is disconnected, the backup power supply 30 is activated, so that the motor-operated valve 21 can be operated.
At this time, if the code signal cannot be received within a certain time during the operation of the electric valve 21, the disconnection of the communication cable 24 can also be detected.
In this way, the emergency operation can be executed in response to the operation of the seismic device 25. In addition, since the code signal can be used to distinguish from noise, malfunction can be prevented.

Next, when performing a maintenance / inspection operation, the switch S1 of the communication means (code signal transmission means) 26 of the control panel 20 is operated so that the code “in maintenance / inspection operation” is output. Then, a code “T” signal is transmitted from the code signal transmitting means 26 ′ at the same cycle T1 as in the case of the “normal operation” as shown in FIG. When the communication (reception) means 28 of the motorized valve 21 receives this, the received signal is identified by the identification means 35 of the control means 29. When the identified code is “T”, the identifying unit 35 outputs “0” to the gate circuit 38 to enable the canceling unit 36. In this way, the “H” level signal from the seismic device 25 cannot be input to the control means 29, and the output of the gate circuit 38 is set to “0”.
Therefore, the control means 29 is separated from the seismic sensing device 25, and the motor-operated valve 21 can be controlled by operating the control panel 20, but the signal cable 22 and the communication cable 24 during the maintenance inspection work. The motor-operated valve 21 is prevented from operating even if it is disconnected or disconnected.
Further, even if the power cable 23 is disconnected or disconnected during the maintenance and inspection work, the motorized valve 21 does not operate in an unintended manner because the power supply is immediately switched to the backup power source 30. For example, in a spring return type electric valve, the state before the power cable 23 is disconnected or disconnected is maintained, and the valve element 33 does not perform an unexpected shut-off operation by the spring. Therefore, the work can be performed safely.
Until the identification unit 35 identifies the code “N”, the cancellation unit 36 maintains this state.

  In this way, it is possible to discriminate whether the interruption is due to maintenance inspection work or the interruption due to an earthquake. Therefore, emergency operations can be performed in the event of an earthquake, and maintenance and inspection can be performed safely. Further, if the communication cable 24 is arranged along the power cable 23 and the signal cable 22, the present invention can be applied to an existing cable.

In Example 1, instead of the two types of code signals of the embodiment, signals of two different frequencies f1 and f2 are used as shown in FIG. Therefore, as shown in FIG. 7, the communication means 26 of the control panel 20 includes an oscillating means 26 ″ for transmitting signals of two different frequencies f1 and f2, instead of the code signal transmitting means 26 ′, and a motor-operated valve. As the discriminating means 43 for discriminating two frequencies, the communication means 28 of 21 includes a filter circuit (a low-pass filter and a high-pass filter are used in FIG. 7 but are not limited to this filter configuration).
Since only the two frequencies f1 and f2 are identified in this way, a filter circuit having a simple configuration can be used. Therefore, there is an advantage that the cost can be reduced.
Other configurations and operational effects are the same as those described in the embodiment, and a description thereof will be omitted.

In the second embodiment, a code signal or a frequency signal is superimposed on the power cable 23 in addition to the control (operation) signal and the output signal of the seismic device 25. Thus, since the number of cables can be reduced by superimposing the code signal or the frequency signal on the power cable 23, the installation cost can be reduced and the maintenance and inspection work can be reduced.
Therefore, as shown in FIG. 8, the communication means 26 and 28 of the control panel 20 and the motor-operated valve 21 are configured to include a modem 50 for power line carrier communication. For example, an orthogonal frequency division multiplexing (OFDM) is used. Use to send and receive.
In this configuration, the control means 29 employs an embedded system such as a microcontroller, and includes an identification means 35 and a cancellation means 36. The identification unit 35 identifies, for example, a code signal received by the communication unit 28.
The canceling unit 36 changes the processing of the program of the control unit 29 based on the output identified by the identifying unit 35 and permits or prohibits execution of the emergency operation.

In the second embodiment configured as described above, when the switch S1 of the communication means 26 of the control panel 20 is operated to output the code “in operation”, the modem 50 causes the digital signal of the code “N” to be output. Are digitally modulated into analog signals by a large number of subcarriers and superimposed on the power cable 23 serving as a transmission path for transmission.
In the motor operated valve 21 that has received this, the modem 50 of the communication means 28 demodulates the subcarrier into a digital signal and identifies it by the identification means 35. When the code signal is “N”, the cancel unit 36 changes the processing program of the control unit 29 to execute a program (normal operation) including an emergency operation program.
Therefore, the motor-operated valve 21 is controlled by a control (operation) signal superimposed on the power cable 23 from the control panel 20 via the modem 50. In the event of an earthquake, when an “L” level signal is input from the seismic sensing device 25 via the modem 50, the motor-operated valve 21 performs an emergency operation.

  At this time, when the power cable 23 is disconnected due to an earthquake, the power source 30 is switched to the backup power source 30. At this time, since the code signal is in the “N” state and the transmission signal to the modem 50 of the communication means 28 of the motorized valve 21 is interrupted, the identification means 35 continues the program while holding “N”. The control means 29 executes an emergency operation.

On the other hand, when performing maintenance inspection work, the switch S1 of the communication means 26 of the control panel 20 is operated so that the code “working” is output. Then, the digital signal of the code “T” is modulated into an analog signal and transmitted by being superimposed on the power cable 23.
In the motor operated valve 21 that has received this, the modem 50 of the communication means 28 demodulates the analog signal into a digital signal. Then, the identification unit 35 identifies the code. When the code is “T”, the state of the code “T” is held until the code “N” is received next. Therefore, the cancel unit 36 changes the processing program of the control unit 29 to execute a program that does not include an emergency operation. As a result, the electric valve 21 can be controlled by operating the control panel 20. Further, even if the power cable 23 is disconnected in maintenance work or the power cable 23 connected by the connector 60 is disconnected, the backup power source 30 is switched, and the motor-operated valve 21 does not operate. Therefore, maintenance inspection work can be performed safely.
Other configurations and operational effects are the same as those described in the embodiment, and a description thereof will be omitted.

In the second embodiment, a code signal is used as a signal to be superimposed. However, signals having two different frequencies may be used instead of the code signal. In that case, as described in the first embodiment, a configuration similar to a filter circuit (digital or analog filter) may be provided as the discriminating means 43 for distinguishing two frequencies.
Other configurations and operational effects are the same as those described in the embodiment and Example 1, and thus the description thereof is omitted.

  By doing in this way, it can be discriminated whether it is the interruption | blocking by maintenance inspection work, or the interruption | blocking by an earthquake. As a result, maintenance inspection work can be performed safely.

20 Control Panel 21 Electric Valve 22 Signal Cable 23 Power Cable 24 Communication Cable 25 Seismic Device 26 Communication Means 26 'Code Signal Transmission Means 27 Motor Valve Body 28 Communication Means 29 Control Means 30 Backup Power Supply 35 Identification Means 36 Cancel Means 50 Power carrying modem S1 switch

Claims (4)

When the connection with the control panel is interrupted, the motor-operated valve device operates the motor-operated valve by starting the backup power source,
Provided on the control panel side is a code signal transmission means for transmitting one of two codes (signs) during operation and maintenance work according to the operation to the motorized valve side at a constant interval,
When the motorized valve side has a backup power source, the receiving means and the identification means for distinguishing the two codes received by the receiving means during operation and maintenance and inspection work, and when the identification means identifies that the maintenance and inspection work is in progress A motor-operated valve device comprising cancel means for canceling the operation of the motor-operated valve when the connection between the control panel and the motor-operated valve is interrupted.   In place of the code signal transmitting means for transmitting the two codes, the control panel is provided with an oscillating means for transmitting signals of two different frequencies corresponding to during operation and maintenance and inspection work at a constant interval. 2. The motor-operated valve according to claim 1, further comprising: a discriminating unit that discriminates two frequencies, and a canceling unit that cancels the operation of the motor-operated valve based on a discrimination output of the discriminating unit, instead of the identification unit on the side. apparatus.   The motor-operated valve device according to claim 1 or 2, further comprising a communication line for transmitting a code signal or a frequency signal between the control panel and the motor-operated valve.   4. The motor-operated valve device according to claim 3, wherein a code signal or a frequency signal is superimposed on a power line connecting the control panel and the motor-operated valve instead of the communication line.

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