JP2009121976A - Liquid leakage detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect a liquid leakage position without depending on liquid leakage impedance. <P>SOLUTION: A liquid leakage detecting device includes: a signal wire 4 transmitting current for detecting liquid leakage; a resistance wire 5, having a resistance value which is in proportional to the wire length and being connected to the signal wire, transmitting the current for detecting liquid leakage; a detection wire 6, insulation-arranged to the resistance wire, detecting a short circuit with the resistance wire; and a control part 10 detecting the liquid leakage point according to the short circuit between the resistance wire and the detection wire. When a voltage value Vb at the detection wire side exceeds a liquid leakage determination threshold value during shutting down the conduction between the signal wire and the detection wire by a Zener diode 7 which shuts down the conduction between the signal wire and the detection wire, it is determined that a liquid leakage generates, and based on the voltage value Va at the resistance wire side and the voltage value Vz from the reference point of the resistance wire to the liquid leakage point, the resistance value Rx from the reference point of the resistance wire to the liquid leakage point is computed, then the liquid leakage position on the resistance wire is computed based on the resistance value Rx and the resistance value for a prescribed length unit of the resistance wire material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a leakage detection device that electrically detects leakage of water, chemicals, and the like attached to, for example, a wall surface, a floor surface, or a device surface in a factory facility.

  Conventionally, such a leak detection device includes a detection line having an electrode line composed of a first electrode line and a second electrode line that are insulated from each other and substantially parallel to each other, a DC constant current power source, and a leak between the electrode lines. Voltage measuring means for measuring a voltage drop from the liquid position, that is, the liquid leakage position on the second electrode line side to one end or the other end of the second electrode line, and generation and leakage of liquid based on the measurement result of the voltage measuring means Determination means for determining the position, switch means for switching one end or the other end of the second electrode line, one end side connection line for connecting the DC constant current power source and the electrode line through this switch means, and second through the switch means The other end side connection line that connects the other end side of the electrode wire and the voltage measuring means, and the voltage measuring means is connected to the second electrode line side from the liquid leakage position on the second electrode line side at the time of liquid leakage monitoring. Measure the voltage drop to one end and leak on the second electrode line side The voltage drop from the second electrode line side to the other end on the second electrode line side is measured, and the determination means includes a voltage drop measurement value from the leakage position on the second electrode line side to one end on the second electrode line side, Based on the measured voltage drop from the leakage position on the electrode line side to the other end on the second electrode line side, the distance from the leakage position on the second electrode line side to one end on the second electrode line side, The ratio between the leakage position on the electrode line side and the distance from the other end on the second electrode line side is calculated, and based on this distance ratio and the total length distance from one end to the other end of the second electrode line, the second A technique for detecting a leak position on an electrode wire is widely known (see, for example, Patent Document 1).

  According to the leak detection device of Patent Document 1, a resistance wire (second electrode wire) proportional to the wiring length is employed without connecting a resistor for each leak detection section, and leakage on the second electrode wire side is adopted. Based on the measured voltage drop from the liquid position to one end on the second electrode line side and the measured voltage drop from the leak position on the second electrode line side to the other end on the second electrode line side, the second electrode line The ratio of the distance from the liquid leakage position on the side to one end and the distance from the liquid leakage position on the second electrode line side to the other end on the second electrode line side is calculated, and this distance ratio and the second electrode line Since the leak position on the second electrode line is detected based on the total distance from one end to the other end, the leak position can be detected without connecting a resistor for each leak detection section. it can.

  In addition, as another conventional leakage detection device, a detection line having an electrode line composed of a first electrode line and a second electrode line that are insulated from each other and substantially parallel to each other, and a predetermined number of position-detecting insulation-coated strands The second electrode wire is cut at predetermined intervals, and a leak detection wire cross-connected to the position detection insulation covering wire for each interval is used. Connect a resistor between the other and each insulation wire for position detection and between the electrode wires, and monitor the resistance value with the second electrode wire for each resistor in order to detect the leakage and disconnection sections. This method is widely known (see, for example, Patent Document 2).

According to the leak detection device of Patent Document 2, the resistance value with the second electrode wire is sequentially monitored for each resistor, and the leak zone and the disconnection zone are detected. The disconnection section can be detected.
Japanese Unexamined Patent Publication No. 2007-97235 (refer to paragraph numbers “0002” to “0004” in the prior art and FIGS. 18 and 19) Japanese Utility Model Publication No. 2-47539 (see the scope of utility model registration request and FIG. 2)

  However, according to the leak detection device of Patent Document 1 described above, the leak occurrence and the leak position are simultaneously detected by flowing a DC constant current through the leak between the first electrode line and the second electrode line when the leak occurs. When a constant current power supply is used to flow a DC constant current to the leak to realize detection of the leak position independent of the leak impedance, if the leak impedance is high, the second electrode line May not be able to detect the leak position because no current flows.

  Therefore, considering the influence of the leakage impedance, it is conceivable to increase the resistance value of the second electrode wire in accordance with the leakage type to cope with the high impedance. Since a voltage drop occurs when a constant current flows, it is necessary to set the voltage value of the constant voltage power source high. However, in this case, a high voltage is generated in the second electrode line, which is difficult to realize. There is.

  Further, according to the leak detection device of Patent Document 2, a resistor is connected between the electrode wires and the position-detecting insulation-coated strands, and between the electrode wires, and the electrode wires and the position-detecting insulation-coated strands are mutually connected. Based on the resistance value between and the resistance value between the electrode wires, it was decided to detect the section of the leak position and the section of the disconnection position, but although it can detect the disconnection section, it is not possible to identify the disconnected line Can not.

  The present invention has been made in view of the above points, and the object of the present invention is to detect leakage with excellent feasibility capable of detecting a leakage position in a short time without depending on leakage impedance. To provide an apparatus.

  In addition, the present invention has been made in view of the above points, and an object of the present invention is to provide a liquid leakage detection device capable of specifying a broken line as well as a liquid leakage position. is there.

  In order to achieve the above object, the liquid leakage detection apparatus of the present invention includes a current output means for outputting a predetermined level of liquid leakage detection current, a signal line for transmitting the liquid leakage detection current from the current output means, A resistance line that has a resistance value proportional to the wiring length, is connected to the signal line and transmits the leakage detection current, and a detection line that is insulated from the resistance line and detects a short circuit with the resistance line, A liquid leakage detection device having a control means for detecting a liquid leakage position on the resistance wire in response to a short circuit between the resistance wire and the detection wire, the continuity between the signal wire and the detection wire being Conduction means for cutting off and conducting between the signal line and the detection line according to a predetermined signal, and the voltage value on the detection line side during conduction interruption between the signal line and the detection line by the conduction means Voltage value measuring means for measuring the voltage and the voltage value measuring means A leakage threshold value determining means for measuring whether or not the voltage value on the detection line side exceeds a leakage determination threshold value, and the control means includes a leakage threshold determination means. When the voltage value on the detection line exceeds the leakage determination threshold, it is determined that leakage has occurred between the resistance line and the detection line, and the voltage value on the resistance line side is measured through the voltage value measuring means. Then, a current value is calculated based on the voltage value and the reference resistance value on the resistance line side, and from the reference position on the resistance line based on the current value, the voltage value on the detection line side and the voltage value on the resistance line side. A leakage position calculating means for calculating a resistance value related to the resistance line up to the leakage position and calculating a leakage position on the resistance line based on the resistance value and a resistance value of a predetermined length unit of the resistance wire material. To have.

  Therefore, according to the liquid leakage detection device of the present invention, the voltage value on the detection line side is measured while the conduction means cuts off the conduction between the signal line and the detection line, and the voltage value on the detection line side is measured. When the liquid leakage exceeds a leakage determination threshold, it is determined that leakage has occurred between the resistance wire and the detection wire, and the voltage value on the resistance wire side is measured. Based on the voltage value on the resistance wire side and the reference resistance value, Based on the current value, the voltage value on the detection line side and the voltage value on the resistance line side, the resistance value related to the resistance line from the reference point on the resistance line to the leak point is calculated. Based on the resistance value and the resistance value of the resistance wire material in a predetermined length unit, the leakage position on the resistance wire is calculated, so that no leakage occurs and no current is passed through the leakage point. By measuring the voltage through the leak point, it does not depend on the leak impedance for a short time. It is possible to detect the leak location, it is possible to provide an excellent leak detection apparatus feasibility.

  Further, the liquid leakage detection device of the present invention measures the voltage value on the detection line side through the voltage value measurement means when the conduction means conducts between the signal line and the detection line, and the detection line side It has a detection line side determination means for determining whether or not the voltage value is zero volts, and when the voltage value on the detection line side is zero volts in the detection line side determination means, the control means It was determined that the disconnection occurred between the detection lines.

  Therefore, according to the liquid leakage detection device of the present invention, when the signal line and the detection line are conducted, the voltage value on the detection line side is measured, and when the voltage value on the detection line side is zero volts, the signal Since the disconnection is determined between the line and the detection line, the disconnection between the signal line and the detection line can be recognized.

  Further, the liquid leakage detection device of the present invention may be provided on the resistance wire side corresponding to the liquid leakage detection current through the voltage value measurement means while the conduction means interrupts conduction between the signal line and the detection line. A resistance line side determining means for measuring a voltage value and determining whether or not the voltage value on the resistance line side is zero volts; and the control means is configured to determine whether the resistance line side is determined by the resistance line side determining means. When the voltage value is zero volts, it is determined that the signal line and the resistance line are disconnected.

  Therefore, the liquid leakage detection device of the present invention measures the voltage value on the resistance line side corresponding to the liquid leakage detection current while the conduction between the signal line and the detection line is cut off. When the voltage value is zero volts, it is determined that the signal line and the resistance line are disconnected, so that the disconnection between the signal line and the resistance line can be recognized.

  Further, in the liquid leakage detection device of the present invention, the control unit is configured to determine the voltage value on the detection line side and the voltage on the resistance line side based on the determination results of the detection line side determination unit and the resistance line side determination unit. If both values are zero volts, it is determined that the signal line is disconnected, and if only the voltage value on the detection line side is zero volts, it is determined that the detection line is disconnected, and only the voltage value on the resistance line side is zero volts. In this case, it was determined that the resistance wire was disconnected.

  Therefore, according to the liquid leakage detection device of the present invention, when both the voltage value on the detection line side and the voltage value on the resistance line side are zero volts, it is determined that the signal line is disconnected, and the detection line side When only the voltage value is zero volts, it is determined that the detection line is disconnected, and when only the voltage value on the resistance line side is zero volts, it is determined that the resistance line is disconnected. The disconnection of the wire and the resistance wire can be identified and recognized.

  Further, the liquid leakage detection device of the present invention is configured such that the current on the resistance line side is based on the voltage value and the reference resistance value on the resistance line side while the conduction means interrupts conduction between the signal line and the detection line. Calculate a voltage value of the resistance wire itself by subtracting the voltage value on the resistance wire side from the voltage value corresponding to the leakage detection current of the predetermined level, and calculate the voltage value of the resistance wire itself, The resistance value of the resistance wire itself is calculated based on the current value on the resistance wire side, and the resistance wire itself is wired based on the resistance value of the resistance wire itself and the resistance value of the resistance wire material in a predetermined length unit. Resistance wire wiring length calculation means for calculating the length is provided.

  Therefore, according to the liquid leakage detection device of the present invention, the current value on the resistance line side is calculated based on the voltage value and the reference resistance value on the resistance line side during conduction interruption between the signal line and the detection line. The voltage value of the resistance line itself is calculated by subtracting the voltage value on the resistance line side from the voltage value corresponding to the leakage detection current of the predetermined level, and the voltage value of the resistance line itself and the resistance The resistance value of the resistance wire itself is calculated based on the current value on the wire side, and the wiring length of the resistance wire itself is calculated based on the resistance value of the resistance wire itself and the resistance value of the resistance wire material in a predetermined length unit. As a result, the wiring length of the resistance wire itself can be recognized.

  According to the liquid leakage detection device of the present invention configured as described above, the voltage value on the detection line side is measured while the conduction between the signal line and the detection line is cut off, and the voltage value on the detection line side is leaked. When the liquid determination threshold is exceeded, it is determined that leakage has occurred between the resistance line and the detection line, the voltage value on the resistance line side is measured, and the current value is based on the voltage value on the resistance line side and the reference resistance value. Based on the current value, the voltage value on the detection line side, and the voltage value on the resistance line side, the resistance value related to the resistance line from the reference point on the resistance line to the leakage point is calculated. Based on the resistance value and the resistance value of the resistance wire material in the predetermined length unit, the leak position on the resistance wire is calculated, so that leakage does not occur and current does not flow to the leak point. By measuring the voltage through the liquid point, the position of the liquid leakage can be achieved in a short time without depending on the liquid leakage impedance. Can be detected, it is possible to provide an excellent leak detection apparatus feasibility.

  Hereinafter, a liquid leakage detection apparatus showing an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration inside the liquid leakage detection device showing the present embodiment.

  1 includes a power supply unit 2 that outputs a leakage detection current corresponding to the voltage value V1 and a disconnection detection current corresponding to the voltage value V2, and the voltage value V1 of the power supply unit 2 or Switching selection of the voltage value V2, that is, the output switching unit 3 that switches and outputs the leakage detection current or the disconnection detection current, and the leakage detection current or the disconnection detection current according to the switching operation of the output switching unit 3 The signal line 4 that transmits the current, the resistance value proportional to the wiring length, the resistance line 5 that is connected to the signal line 4 and transmits the leakage detection current, and is insulated from the resistance line 5. When the voltage V1 corresponding to the leakage detection current is selected through the output switching unit 3 and the detection line 6 that detects a short circuit between the signal line 4 and the detection line 6, the output switching unit 3 is disconnected. When the voltage value V2 corresponding to the disconnection detection current is selected through the signal line 4 and Zener diode 7 that conducts between the detection lines 6, a first voltage measurement unit 8 that measures a voltage value on the resistance line 5, a second voltage measurement unit 9 that measures a voltage value on the detection line 6, and a liquid leakage And a control unit 10 that controls the entire detection apparatus 1.

  The power supply unit 2 outputs a leakage detection current having a voltage value V1 or a disconnection detection current having a voltage value V2. Note that the voltage value V1 <the voltage value V2.

  The output switching unit 3 selects and switches the voltage value V1 or the voltage value V2 of the power source unit 2 according to the switching control signal of the control unit 10, that is, switches and outputs the leakage detection current or the disconnection detection current, which will be described later. At the time of the disconnection monitoring process between the signal line 4 and the resistance line 5, the leakage occurrence monitoring process and the leakage position measurement process, the leakage detection current is transmitted to the signal line 4 and between the signal line 4 and the detection line 6 described later. In the disconnection monitoring process, a disconnection detection current is transmitted to the signal line 4.

  Since the Zener diode 7 has a voltage value V1 <zener voltage <voltage value V2, in the case of a leakage detection current, the conduction between the signal line 4 and the detection line 6 is cut off, but in the case of a disconnection detection current, The signal line 4 and the detection line 6 are electrically connected.

  Further, the first voltage measuring unit 8 connects the first switch unit 21 that turns on and off the current inflow to the resistance line 5 through the signal line 4 and the reference resistor 22 in accordance with the switching control signal of the control unit 10. Then, the voltage value Va on the resistance wire 5 side is measured.

  The second voltage measuring unit 9 includes a second switch unit 23 that turns on / off current inflow to the detection line 6 through the signal line 4 in response to a switching control signal from the control unit 10, and a limiting resistor 24 that limits the inflow current. Are connected to a sensitivity adjustment volume 25 for detecting leakage, and the voltage value on the detection line 6 side is measured.

  The control unit 10 performs the disconnection monitoring process between the signal line 4 and the detection line 6 → the disconnection monitoring process (wiring length calculation process) between the signal line 4 and the resistance line 5 → the leakage occurrence monitoring process → the leakage position measurement process. It is executed sequentially.

  The disconnection monitoring process between the signal line 4 and the detection line 6 is a process for determining whether or not the signal line 4 and the detection line 6 are disconnected. The disconnection monitoring process between the signal line 4 and the resistance line 5 is a process for determining whether or not the signal line 4 and the resistance line 5 are disconnected after the disconnection monitoring process between the signal line 4 and the detection line 6. Further, the wiring length calculation process is a process that is performed simultaneously with the disconnection monitoring process between the signal line 4 and the resistance line 5 and is a process for calculating the wiring length of the resistance line 5 itself. The leakage occurrence monitoring process is a process for determining whether or not leakage has occurred after the disconnection monitoring process between the signal line 4 and the resistance line 5. Furthermore, the leak position measurement process is a process of calculating the leak position on the resistance wire 5 when the leak occurrence is detected in the leak occurrence monitoring process.

  FIG. 2 is a block diagram showing a schematic configuration inside the control unit 10.

  The control unit 10 illustrated in FIG. 2 includes a switching control unit 11 that performs switching control of the output switching unit 3, the first switch unit 21, and the second switch unit 23, a disconnection monitoring process between the signal line 4 and the detection line 6, and a signal line 4 and the resistance line 5 are calculated based on the disconnection determination unit 12 that determines the disconnection of the signal line 4, the resistance line 5, and the detection line 6, and the wiring length calculation process. A leakage length calculation unit that calculates a leakage position based on a leakage position measurement process, a leakage generation determination unit that determines whether or not leakage has occurred, and a leakage position measurement process. 15.

  As shown in FIG. 3, the switching control unit 11 outputs a switching control signal to switch the output switching unit 3, the first switch unit 21, and the second switch unit 23, and between the signal line 4 and the detection line 6. In the disconnection monitoring process, the output switching unit 3 is set to the voltage value V2 side of the disconnection detection current, the first switch unit 21 is set to OFF, the second switch unit 23 is set to ON, and the disconnection between the signal line 4 and the resistance line 5 is performed. During the monitoring process (wiring length calculation process), the output switching unit 3 is set to the voltage value V1 side of the leakage detection current, the first switch unit 21 is set to ON, and the second switch unit 23 is set to OFF. Sets the output switching unit 3 to the voltage value V1 side of the leakage detection current, the first switch unit 21 is set to OFF, and the second switch unit 23 is set to ON. During the leakage position measurement process, the output switching unit 3 is set to detect leakage. Current value V1 side, the first switch unit 21 is ON, the second switch unit 3 is intended to be set to OFF.

  In the disconnection monitoring process between the signal line 4 and the detection line 6, the disconnection determination unit 12 measures the voltage value Vb on the detection line 6 side corresponding to the disconnection detection current through the second voltage measurement unit 9, and the same voltage value It is determined whether or not Vb is zero volts. If the same voltage value Vb is zero volts, it is temporarily determined that the signal line 4 and the detection line 6 are disconnected. If the same voltage value Vb is not zero volts, the signal line 4 and the detection are detected. It is determined that the connection between the lines 6 is normal.

  Further, the disconnection determination unit 12 measures the voltage value Va on the resistance line 5 side corresponding to the leakage detection current through the first voltage measurement unit 8 in the disconnection monitoring process between the signal line 4 and the resistance line 5, It is determined whether or not the same voltage value Va is zero volts. If the same voltage value Va is zero volts, it is temporarily determined that the signal line 4 and the resistance line 5 are disconnected. If the same voltage value Va is not zero volts, the signal line 4 and the resistance wire 5 are determined to be normal.

  Further, the disconnection determination unit 12 determines the voltage value Vb on the detection line 6 side and the resistance based on the processing results of the disconnection monitoring process between the signal line 4 and the detection line 6 and the disconnection monitoring process between the signal line 4 and the resistance line 5. When both voltage values Va on the line 5 side are zero volts, it is determined that the signal line 4 is disconnected, and when only the voltage value Vb on the detection line 6 side is zero volts, it is determined that the detection line 6 is disconnected, and the resistance line 5 side When only the voltage value Va is zero volts, it is determined that the resistance wire 5 is disconnected.

  In addition, the wire length calculation unit 13 measures the voltage value Va on the resistance line 5 side corresponding to the leakage detection current through the first voltage measurement unit 8 during the disconnection monitoring process between the signal line 4 and the resistance line 5, When the current value I on the resistance wire 5 is calculated based on the voltage value Va and the resistance value R1 of the reference resistor 22, the resistance value on the resistance wire 5 is Rz, and the voltage value applied to the resistance wire 5 is Vz. Since Vz = V1−Va and Rz = (V1−Va) / I, when the resistance value of the material of the resistance wire 5 is XΩ in units of 1 meter, the wiring length of the resistance wire 5 is calculated by Rz / X It is.

  Further, the leakage occurrence determination unit 14 measures the voltage value Vb on the detection line 6 side corresponding to the leakage detection current through the second voltage measurement unit 9 in the leakage occurrence monitoring process, and transmits the signal through the Zener diode 7. It is determined whether or not the voltage value Vb exceeds the leakage determination threshold value even though the conduction between the line 4 and the detection line 6 is interrupted, and as shown in FIG. When the leakage determination threshold is exceeded, it is determined that leakage has occurred between the resistance wire 5 and the detection wire 6, and the flow proceeds to the leakage position measurement process. Note that the second voltage measurement unit 9 connects a sensitivity adjustment volume 25 for leak detection to the subsequent stage of the second switch unit 23 and the limiting resistor 24, and FIG. By adjusting the voltage value Vb as shown in (), it is possible to arbitrarily adjust the sensitivity for determining that leakage has occurred.

  Further, the leakage position calculation unit 15 measures the voltage value Va on the resistance wire 5 side corresponding to the leakage detection current through the first voltage measurement unit 8 in the leakage position measurement process, and the voltage value Va and When the current value I on the resistance wire 5 is calculated based on the resistance value R1 of the reference resistor 22 and the resistance value Rx from the reference point α to the leakage point β on the resistance wire 5 is Rx = (Vb−Va) The resistance value Rx can be calculated by / I, and when the resistance value in units of 1 meter on the material of the resistance wire 5 is X (Ω), Rx / X = R1 (Vb−Va) / XVa The distance from the reference point α to the leak point β is calculated, and the leak position is calculated according to the distance.

  The liquid leakage detection device according to the present invention is the liquid leakage detection device 1, the current output means is the power supply unit 2, the signal line is the signal line 4, the resistance line is the resistance line 5, the detection line is the detection line 6, and the control means is The control unit 10, the conduction means is the Zener diode 7, the voltage value measurement means is the first voltage measurement unit 8 and the second voltage measurement unit 9, the leak threshold determination means is the leak occurrence determination part 14, and the leak position calculation means is the leak The liquid position calculation unit 15, the detection line side determination unit corresponds to the disconnection determination unit 12, the resistance line side determination unit corresponds to the disconnection determination unit 12, and the resistance line wiring length calculation unit corresponds to the wiring length calculation unit 13.

  Next, the operation of the liquid leakage detection device 1 showing the present embodiment will be described.

  FIG. 5 is an explanatory view briefly showing the operation of the liquid leakage detection apparatus 1 related to the disconnection monitoring process between the signal line 4 and the detection line 6.

  First, as illustrated in FIG. 5, when the switching control unit 11 in the control unit 10 starts the disconnection monitoring process between the signal line 4 and the detection line 6, the output switching unit 3 is connected to the voltage value V2 of the disconnection detection current. On the other hand, the first switch unit 21 is set to OFF and the second switch unit 23 is set to ON.

  The control unit 10 causes the disconnection detection current to flow into the signal line 4 through the output switching unit 3, and the disconnection detection current flows into the Zener diode 7, thereby causing the signal line 4 and the detection line 6 to pass through the Zener diode 7. And the voltage value Vb on the detection line 6 side is measured through the second voltage measuring unit 9.

  The disconnection determination unit 12 in the control unit 10 determines whether or not the voltage value Vb on the detection line 6 side measured by the second voltage measurement unit 9 is zero volts, and if the voltage value Vb is zero volts, When it is temporarily determined that a disconnection has occurred between the line 4 and the detection line 6 and the voltage value Vb is not zero volts, it is determined that the connection between the signal line 4 and the detection line 6 is normal.

  FIG. 6 is an explanatory view briefly showing the operation of the liquid leakage detection apparatus 1 related to the disconnection monitoring process between the signal line 4 and the resistance line 5.

  As illustrated in FIG. 6, the control unit 10 starts the disconnection monitoring process between the signal line 4 and the resistance line 5 after executing the disconnection monitoring process between the signal line 4 and the detection line 6.

  When starting the disconnection monitoring process between the signal line 4 and the resistance line 5, the switching control unit 11 in the control unit 10 sets the output switching unit 3 to the voltage value V1 side of the leakage detection current, and the first switch unit 21. Is set to ON, and the second switch unit 23 is set to OFF.

  The control unit 10 flows the leakage detection current into the signal line 4 through the output switching unit 3, and the resistance line through the first voltage measurement unit 8 while the conduction between the signal line 4 and the detection line 6 is cut off through the Zener diode 7. The voltage value Va on the 5th side is measured.

  The disconnection determination unit 12 in the control unit 10 determines whether or not the voltage value Va on the resistance wire 5 side measured by the first voltage measurement unit 8 is zero volts, and if the voltage value Va is zero volts, When it is temporarily determined that a disconnection has occurred between the line 4 and the resistance line 5 and the voltage value Va is not zero volts, it is determined that the connection between the signal line 4 and the resistance line 5 is normal.

  The disconnection determination unit 12 determines the voltage value Vb and resistance on the detection line 6 side based on the determination result of the disconnection monitoring process between the signal line 4 and the detection line 6 and the determination result of the disconnection monitoring process between the signal line 4 and the resistance line 5. When both voltage values Va on the line 5 side are zero volts, it is determined that the signal line 4 is disconnected, and when only the voltage value Vb on the detection line 6 side is zero volts, it is determined that the detection line 6 is disconnected, and the resistance line 5 When only the voltage value Va on the side is zero volts, it is determined that the resistance wire 5 is disconnected, and the determination result is notified and output by an LED, LCD, speaker, etc. (not shown). In addition, the user of the leak detection apparatus 1 can recognize the disconnection of the signal line 4, the resistance line 5, and the detection line 6 based on the notification content.

  According to the disconnection monitoring process between the signal line 4 and the detection line 6 illustrated in FIG. 5, the signal line 4 and the detection line 6 are electrically connected according to the disconnection detection current, and the detection line 6 side is connected through the second voltage measurement unit 9. When the voltage value Vb is measured and when the voltage value Vb is zero volts, it is temporarily determined that the signal line 4 and the detection line 6 are disconnected, so that the disconnection between the signal line 4 and the detection line 6 is recognized. Can do.

  Further, according to the disconnection monitoring process between the signal line 4 and the resistance line 5 shown in FIG. 6, the first voltage measuring unit is cut off while the conduction between the signal line 4 and the detection line 6 is cut off according to the leakage detection current. 8, the voltage value Va on the resistance line 5 side is measured, and when the voltage value Va is zero volts, it is temporarily determined that the signal line 4 and the resistance line 5 are disconnected. Can be recognized.

  Further, according to the disconnection monitoring process shown in FIGS. 5 and 6, when both the voltage value Vb on the detection line 6 side and the voltage value Va on the resistance line 5 side are zero volts, it is determined that the signal line 4 is disconnected, When only the voltage value Vb on the detection line 6 is zero volts, it is determined that the detection line 6 is disconnected, and when only the voltage value Va on the resistance line 5 is zero volts, it is determined that the resistance line 5 is disconnected. The disconnection of the signal line 4, the resistance line 5, and the detection line 6 can be identified and recognized.

  The wiring length calculation unit 13 in the control unit 10 executes the wiring length calculation process at the same time when the disconnection monitoring process between the signal line 4 and the resistance line 5 shown in FIG. Substituting the voltage value Va on the resistance wire 5 side corresponding to the leakage detection current measured in step 1 and the resistance value R1 of the reference resistor 22 into the equation of I = Va / R1, and between the signal line 4 and the resistance line 5 The current value I of the leakage detection current is calculated.

  Furthermore, when the voltage value applied to the resistance wire 5 is Vz, the wiring length calculation unit 13 has Vz = V1−Va. Therefore, the resistance value Rz of the resistance wire 5 is Rz = (V1−Va) / I. . At this time, since the resistance value of the material of the resistance wire 5 is fixed, the wiring length of the resistance wire 5 is calculated by the formula of Rz / X when X (Ω) is set in units of 1 meter (m). The wiring length of the line 5 is stored and held.

  According to this wiring length calculation process, the resistance value Rz of the resistance wire 5 is calculated based on the current value I of the leakage detection current between the signal line 4 and the resistance wire 5 and the voltage value Vz applied to the resistance wire 5, Since the wiring length of the resistance wire 5 is calculated based on the resistance value Rz and the resistance value X in units of 1 meter related to the material of the resistance wire 5, the wiring length of the resistance wire 5 is calculated based on the calculation result. Can be recognized.

  Next, when the control unit 10 stores the wiring length of the resistance wire 5, the leakage occurrence monitoring process is started. FIG. 7 is an explanatory diagram briefly showing the internal operation of the leakage detection device 1 related to the leakage generation monitoring process.

  When starting the leakage generation monitoring process, the switching control unit 11 in the control unit 10 switches the output switching unit 3 to the voltage value V1 side of the leakage detection current and the first switch unit 21 as shown in FIG. OFF, the second switch unit 23 is set to ON. Since the leakage detection current flows into the signal line 4 through the output switching unit 3, the conduction between the signal line 4 and the detection line 6 is interrupted by the Zener diode 7.

  The leakage occurrence determination unit 14 in the control unit 10 sequentially measures the voltage value Vb on the detection line 6 side through the second voltage measurement unit 9 while the conduction between the signal line 4 and the detection line 6 is cut off, and the same voltage value. It is determined whether or not Vb has exceeded a liquid leakage determination threshold value (see FIG. 4).

  The leakage occurrence determination unit 14 determines that leakage has occurred on the resistance wire 5 when the voltage value Vb on the detection line 6 side exceeds the leakage determination threshold. Further, the leakage occurrence determination unit 14 determines that no leakage has occurred on the resistance wire 5 when the voltage value Vb on the detection line 6 side does not exceed the leakage determination threshold.

  According to the leakage occurrence monitoring process shown in FIG. 7, the voltage value Vb on the detection line 6 side is measured through the second voltage measurement unit 9 even though the conduction between the signal line 4 and the detection line 6 is interrupted. When the voltage value Vb exceeds the leakage determination threshold, it is determined that leakage has occurred on the resistance wire 5, so that the occurrence of leakage can be recognized.

  Furthermore, the control part 10 will start a leak position measurement process, if a leak generation is detected in a leak generation monitoring process. FIG. 8 is an explanatory diagram that briefly shows the internal operation of the leakage detection device 1 related to the leakage position measurement processing.

  When starting the leakage position measurement process, the switching control unit 11 in the control unit 10 sets the output switching unit 3 to the voltage value V1 side of the leakage detection current and the first switch unit 21 as shown in FIG. ON, the second switch unit 23 is set to OFF.

  The liquid leakage position calculation unit 15 in the control unit 10 measures the voltage value Va on the resistance wire 5 side through the first voltage measurement unit 8, and uses the voltage value Va and the resistance value R1 of the reference resistor 22 as an equation Va / R1. By substituting into, the current value I between the signal line 4 and the resistance line 5 is calculated.

  Furthermore, when the resistance value from the reference point α to the leakage point β on the resistance line 5 is Rx, the leak position calculation unit 15 uses the formula Rx = (Vb−Va) / I to leak from the reference point α. When the resistance value Rx to the liquid point β is calculated and the resistance value in 1 meter unit of the material of the resistance wire 5 is X (Ω), the distance from the reference point α on the resistance wire 5 to the liquid leakage point β is By calculating Rx / X = R1 (Vb−Va) / XVa, the liquid leakage position can be calculated.

  Based on the liquid leakage position calculation result of the liquid leakage position calculation unit 15, the control unit 10 reports and outputs the liquid leakage position using an LCD, LED, speaker, or the like. As a result, the user of the leak detection device 1 can recognize the leak position based on the notification content.

  According to the leak position measurement process shown in FIG. 8, when the leak occurrence is detected in the leak occurrence monitoring process, the voltage value Va on the resistance wire 5 side is measured through the first voltage measurement unit 7, and this voltage value Va is measured. And the current value I between the signal line 4 and the resistance line 5 is calculated based on the resistance value R1 of the reference resistance 22 and based on the current value I, the voltage value Va on the resistance line 5 side, and the voltage value Vb on the detection line 6 side. Then, the resistance value Rx from the reference point α on the resistance wire 5 to the leakage point β is calculated, and on the resistance wire 5 based on the resistance value Rx and the resistance value X of the material of the resistance wire 5 in units of 1 meter. Since the distance from the reference point α to the leakage point β is calculated and the leakage position is calculated based on this distance, the leakage position can be calculated in a short time without depending on the leakage impedance. it can.

  According to the present embodiment, while the conduction between the signal line 4 and the detection line 6 is cut off through the Zener diode 7, the voltage value Vb on the detection line 6 side corresponding to the leakage detection current is measured. When the voltage value Vb on the side exceeds the leakage determination threshold, it is determined that leakage has occurred between the resistance wire 5 and the detection wire 6, and the voltage value Va on the resistance wire 5 side is measured to determine the voltage on the resistance wire 5 side. A current value I is calculated based on the value Va and the reference resistance value R1, and based on the current value I and the resistance value Rz of the resistance wire 5, the resistance value related to the resistance wire 5 from the reference point α to the leakage point β. Rx is calculated, and the distance from the reference point α on the resistance wire 5 to the leakage point β is calculated based on the resistance value Rx and the resistance value X of the resistance wire material in units of 1 meter. Based on this distance, Since the leak position on the resistance wire 5 is calculated, not only the leak occurrence but also the leak point α By providing a voltage measurement through the leakage point α without passing an electric current, it is possible to detect the leakage position in a short time without depending on the leakage impedance. can do.

  Furthermore, according to the present embodiment, the leak occurrence monitoring process for monitoring the occurrence of leak and the leak position measurement process for detecting the leak position are separated, and the sensitivity adjustment volume 25 is set in the leak occurrence monitoring process. By using the partial pressure principle used, it is possible to detect the occurrence of leakage even when the leakage impedance is high. In addition, in the leakage position measurement process, no current is passed through the leakage point α, and the leakage point By measuring the voltage through α, the leak position can be detected in a short time without depending on the leak impedance.

  In addition, according to the present embodiment, the disconnection detection current corresponding to the voltage value V2 flows into the Zener diode 7, thereby conducting between the signal line 4 and the detection line 6 and detection corresponding to the disconnection detection current. The voltage value Vb on the line 6 side is measured, and when the voltage value Vb is zero volts, it is determined that the signal line 4 and the detection line 6 are disconnected, so the disconnection between the signal line 4 and the detection line 6 is recognized. can do.

  Further, according to the present embodiment, the voltage value Va on the resistance line 5 side corresponding to the leakage detection current is measured while the conduction between the signal line 4 and the detection line 6 is cut off through the Zener diode 7, and the same voltage is measured. When the value Va is zero volts, it is determined that the signal line 4 and the resistance line 5 are disconnected, so that the disconnection between the signal line 4 and the resistance line 5 can be recognized.

  Further, according to the present embodiment, when both the voltage value Vb on the detection line 6 side and the voltage value Va on the resistance line 5 side are zero volts, it is determined that the signal line 4 is disconnected and the voltage value on the detection line 6 side. When only Vb is zero volts, it is determined that the detection line 6 is disconnected, and when only the voltage value Va on the resistance line 5 side is zero volts, it is determined that the resistance line 5 is disconnected. 6 and the disconnection of the resistance wire 5 can be identified and recognized.

  Further, according to the present embodiment, the signal line 4 is based on the voltage value Va on the resistance line 5 side and the resistance value R1 of the reference resistor 22 while the conduction between the signal line 4 and the detection line 6 is cut off through the Zener diode 7. And the current value I between the resistance wire 5 is calculated, and the voltage value Va on the resistance wire 5 side is subtracted from the voltage value V1 corresponding to the leakage detection current to calculate the voltage value Vz of the resistance wire 5 itself. Based on the voltage value Vz of the resistance line 5 itself and the current value I between the signal line 4 and the resistance line 5, the resistance value Rz of the resistance line 5 itself is calculated, and the resistance value Rz and resistance line 5 of the resistance line 5 itself are calculated. Since the wiring length of the resistance wire 5 itself is calculated based on the resistance value X of 1 meter unit of the material, the wiring length of the resistance wire 5 itself can be recognized.

  In the above-described embodiment, the sensitivity adjustment volume 25 is disposed after the second switch unit 23 and the limiting resistor 24, and detection is performed through the second voltage measurement unit 9 according to the adjustment operation of the sensitivity adjustment volume 25. Although the voltage value Vb on the side of the line 6 is adjusted to adjust the sensitivity of leakage occurrence, it has arbitrary fixed resistance values R3, R4, and R5 as shown in FIG. Alternatively, a binary SW 25A in which the fixed resistor 25B can be switched and connected may be arranged, and the voltage value Vb on the detection line 6 side measured through the second voltage measuring unit 9 is adjusted according to the switching operation of the binary SW 25A. However, it goes without saying that the same effect can be obtained even if the sensitivity of leakage occurrence is adjusted.

  According to the liquid leakage detection device of the present invention, when the voltage value on the detection line side is measured while the conduction between the signal line and the detection line is cut off, and the voltage value on the detection line side exceeds the liquid leakage determination threshold value , It is determined that leakage occurs between the resistance wire and the detection wire, the voltage value on the resistance wire side is measured, the current value is calculated based on the voltage value on the resistance wire side and the reference resistance value, and the current value Based on the voltage value on the detection line side and the voltage value on the resistance line side, a resistance value related to the resistance line from the reference point on the resistance line to the leakage point is calculated, and the resistance value and the resistance wire material Since the leak position on the same resistance line is calculated on the basis of the resistance value of the predetermined length unit, not only the leak occurs but also the current is not passed through the leak point, and the voltage is measured through the leak point. Therefore, it is possible to detect the leak position in a short time without depending on the leak impedance. Since it is possible to provide a liquid leakage detection device with excellent feasibility, it is useful for a liquid leakage detection device that detects liquid leakage such as water or chemicals adhering to the wall surface, floor surface, or device surface in a factory facility. is there.

It is explanatory drawing which shows schematic structure inside the leak detection apparatus which shows embodiment of this invention. It is a block diagram which shows schematic structure inside the control part which is the principal part of the leak detection apparatus which shows this Embodiment. Output switching unit related to disconnection monitoring processing between signal lines and detection lines, disconnection monitoring processing between signal lines and resistance lines (wiring length calculation processing), leakage generation monitoring processing, and leakage position measurement processing according to the present embodiment It is explanatory drawing which shows the switching condition of a 1st switch and a 2nd switch simply. It is explanatory drawing which shows directly the leak determination threshold value of the leak generation determination part in connection with this Embodiment. It is explanatory drawing which shows briefly operation | movement of the disconnection monitoring process between the signal wire | line and detection line in connection with this Embodiment. It is explanatory drawing which shows briefly the operation | movement of the disconnection monitoring process (wiring length measurement process) between the signal wire | line and resistance wire in connection with this Embodiment. It is explanatory drawing which shows briefly the operation | movement of the leak generation | occurrence | production monitoring process in connection with this Embodiment. It is explanatory drawing which shows the operation | movement of the leak position measurement process in connection with this Embodiment. It is explanatory drawing which shows the substitute example of the sensitivity adjustment volume in connection with this Embodiment.

Explanation of symbols

1 Liquid leakage detection device 2 Power supply (current output means)
4 signal line 5 resistance line 6 detection line 7 zener diode 8 first voltage measurement unit (voltage value measurement means)
9 Second voltage measuring unit (voltage value measuring means)
10 Control unit (control means)
12 Disconnection determination unit (detection line side determination means and resistance line side determination means)
13 Wiring length calculation unit (resistance wire length calculation means)
14 Leakage occurrence determination unit (leakage threshold determination means)
15 Leakage position calculation unit (leakage position calculation means)

Claims (5)

A current output means for outputting a leakage detection current at a predetermined level, a signal line for transmitting the leakage detection current from the current output means, and a resistance value proportional to the wiring length, connected to the signal line. In response to a short circuit between the resistance line and the detection line, a resistance line that transmits the leakage detection current, an insulation arrangement with the resistance line, a detection line that detects a short circuit with the resistance line, A liquid leakage detection device having a control means for detecting a liquid leakage position on the resistance wire,
Conducting means for interrupting conduction between the signal line and the detection line and conducting between the signal line and the detection line in response to a predetermined signal;
Voltage value measuring means for measuring the voltage value on the detection line side during conduction interruption between the signal line and the detection line by this conduction means;
The voltage value measuring means measures the voltage value on the detection line side, and has a leakage threshold value determining means for determining whether or not the voltage value on the detection line side exceeds the leakage determination threshold value,
The control means includes
When the voltage value on the detection line side exceeds the leakage determination threshold value in the leakage threshold determination means, it is determined that leakage has occurred between the resistance line and the detection line, and the resistance is measured through the voltage value measurement means. Measure the voltage value on the line side, calculate the current value based on the voltage value on the resistance line side and the reference resistance value, based on the current value, the voltage value on the detection line side and the voltage value on the resistance line side, Calculate the resistance value related to the resistance wire from the reference position on the resistance wire to the leakage position, and calculate the leakage position on the resistance wire based on the resistance value and the resistance value of the resistance wire material in a predetermined length unit. A liquid leakage detection device having a liquid leakage position calculating means. When the signal line and the detection line are conducted by the conduction means, the voltage value on the detection line side is measured through the voltage value measurement means, and it is determined whether or not the voltage value on the detection line side is zero volts. Detection line side determination means to perform,
The control means includes
The liquid leakage detection device according to claim 1, wherein when the voltage value on the detection line side is zero volts by the detection line side determination unit, it is determined that the signal line and the detection line are disconnected. While the conduction between the signal line and the detection line is interrupted by the conduction means, the voltage value on the resistance line side corresponding to the leakage detection current is measured through the voltage value measurement means, and the resistance line side Having resistance line side determination means for determining whether or not the voltage value is zero volts,
The control means includes
3. The liquid leakage detection apparatus according to claim 2, wherein when the voltage value on the resistance line side is zero volts by the resistance line side determination means, it is determined that the signal line and the resistance line are disconnected. The control means includes
Based on the determination results of the detection line side determination means and the resistance line side determination means, when both the voltage value on the detection line side and the voltage value on the resistance line side are zero volts, it is determined that the signal line is disconnected. ,
When only the voltage value on the detection line side is zero volts, it is determined that the detection line is disconnected,
The liquid leakage detection device according to claim 3, wherein when only the voltage value on the resistance wire side is zero volts, it is determined that the resistance wire is disconnected. While the conduction between the signal line and the detection line is cut off by the conduction means, the current value on the resistance line side is calculated based on the voltage value and the reference resistance value on the resistance line side, and the leakage of the predetermined level The voltage value of the resistance line itself is calculated by subtracting the voltage value of the resistance line side from the voltage value corresponding to the detection current, and based on the voltage value of the resistance line itself and the current value of the resistance line side, A resistance wire wiring length calculating means for calculating a resistance value of the resistance wire itself and calculating a wiring length of the resistance wire itself based on a resistance value of the resistance wire itself and a resistance value of the resistance wire material in a predetermined length unit; 5. The liquid leakage detection device according to claim 1, 2, 3 or 4.

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