JP2006274704A - Pump gate and fault detection method of flap valve for the pump gate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump gate equipped with a fault detection section capable of decreasing the occurrence of breaking troubles in an opening and closing condition detection sensor of a flap valve, being stably and accurately detected and precisely making a diagnosis of a movable state of the opening and closing condition detection sensor and a fault detection method of the flap valve for the pump gate. <P>SOLUTION: In the pump gate penetratingly forming a water pipe communicated between both water ways to an openable cut-off gate door body installed in a boundary section between the first water way and the second water way, mounting a pump case on the water pipe, at the same time, opened to a discharged side of the pump case by water pressure exhaled from a pump and equipped with a flap valve mechanism closing by dead load, the opening and closing condition detection sensor outputting a signal with the opening and closing of the flap valve is provided and, at the same time, the fault detection section detecting a fault of the flap valve is provided on the basis of output signals of an operating condition of the pump and the opening and closing condition detection sensor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is formed by penetrating a water pipe that communicates between the two water paths to a water stop gate door that is installed at the boundary between the first water channel and the second water channel, and attaches a pump case to the water pipe, The present invention relates to a pump gate having a flap valve mechanism that is opened by a water pressure discharged by a pump on the discharge side of a pump case and is closed by its own weight.

  Conventionally, for the purpose of flood control, for example, a water stop gate equipped with a drainage pump is installed on a water stop gate door that can be opened and closed at the junction of rivers and waterways. A pump gate is constructed to transfer water from the water channel to the second water channel by a drainage pump. Such a pump gate is configured so that water flows naturally from a tributary river, which is an example of a first water channel, to a main river, which is an example of a second water channel, in an open state in which the water stop gate body is raised. When the water level of the mainstream river rises from the water level of the tributary river due to water increase due to etc., the pump case avoids the backflow from the mainstream river to the tributary river in the closed state with the stop gate door lowered. The pump built in the pump is operated to transfer water from the tributary river to the main river. The suction side end of the pump facing the tributary river is flanged and the discharge side end facing the main stream A flap valve is attached to the section so as to be openable and closable, and the flow from the tributary river to the main river is allowed, and the flow from the main river to the tributary river is prevented.

  That is, when the pump is operated in the closed state in which the water stop gate body is lowered, the flap valve is opened by the discharge pressure, water is transferred to the mainstream river, and when the pump is stopped, the flap is caused by its own weight. The valve shifts to a closed state, preventing water from flowing back from the main river to the tributary river.

  However, the water transported by the pump often contains solid foreign objects such as driftwood, gravel, piece of cloth, resin pieces, and the pump stops when such foreign objects get entangled with the movable part of the flap valve. Even if the flap valve is not closed, the flap valve is in an abnormal state where it is not completely closed, and the open / close state of the flap valve is detected using a mechanical switch or proximity sensor. A technique for avoiding an accident in which the flap valve contacts and damages the upper door of the water stop gate by restricting the operation has been proposed.

Furthermore, an object of the present invention is to provide a gate pump that can reliably monitor the opening of the flap valve and can save labor, and that can lower the minimum operating water level as much as possible while preventing damage to the gate pump. The flap valve using a non-contact proximity sensor such as a resonance type that detects displacement of a resonance point using a resonance circuit, a capacitance type that detects capacitance, or an eddy current type that detects eddy current loss It has been proposed to provide an opening degree measuring means for measuring the opening degree of the flap valve by measuring the distance up to.
JP 2004-44316 A Japanese Patent No. 3611210

  However, the flap valve open / closed state detection sensor described in Patent Document 1 described above has a problem that the open / closed state cannot be detected accurately due to impact caused by collision of foreign matter floating in the water flowing through the water pipe and adhesion of the foreign matter. there were. For example, in the case where an electrode is provided at the end of the water pipe where the inner surface of the flap valve contacts the inner surface, and the flap valve is detected by contact of the electrode, continuity cannot be detected due to corrosion of the electrode surface. In the case where a recess with a switch embedded is formed at the joint with the flap valve at the discharge side end of the water pipe, and a protrusion that fits into the recess is formed in the flap valve, a foreign object collides with the protrusion. Further, there is a problem in that it cannot be accurately detected due to the deformation or breakage of the projection, and further, the foreign matter entangled with the protrusion. In addition, if foreign matter enters the recess when the flap valve is closed, the switch may always be locked in the activated state. In such a case, there is a problem that an accident of contact with the upper door cannot be avoided.

  Furthermore, in the thing provided with the opening degree measuring means for measuring the opening degree of the flap valve described in Patent Document 2 described above, the object is to make the minimum operating water level as low as possible based on the water level and the opening degree of the flap valve. However, this is merely a premise that the opening degree measuring means operates normally, and there is room for further improvement.

  In view of the above-mentioned conventional drawbacks, the present invention provides a pump gate that can reduce the occurrence of an accident of breakage of an open / close state detection sensor of a flap valve, and can stably and accurately detect the operation, and the operating state of the open / close state detection sensor. It is the point which provides the abnormality detection method of the pump gate and the flap valve of a pump gate provided with the abnormality detection part which can diagnose correctly.

  In order to achieve the above-described object, the first characteristic configuration of the pump gate according to the present invention is installed at the boundary between the first water channel and the second water channel as described in claim 1 of the claims. A free water stop gate door body is formed by penetrating a water pipe that communicates between both water channels, a pump case is attached to the water pipe, and the pump case is opened to the discharge side of the pump case by the water pressure discharged by the pump. A pump gate provided with a flap valve mechanism that is closed by an open / closed state detection sensor that outputs a signal as the flap valve is opened and closed is provided on the outer peripheral side of the tubular body of the flap valve mechanism. is there.

  According to the above-described configuration, in the region where the influence of the flow of the solid foreign matter floating in the water transferred by the pump case or the water pipe during the operation of the pump is relatively small, that is, on the outer peripheral side of the flap valve mechanism tube, Since the open / closed state detection sensor is provided, there is almost no foreign matter colliding with or entangled with the detection portion, and therefore, a damage accident can be prevented and detection can be performed stably and accurately.

  As described in claim 2, the second characteristic configuration is formed by penetrating a water pipe that is installed at the boundary between the first water channel and the second water channel and allows the water channel to communicate between the two water channels. And a pump gate having a flap valve attached to the water pipe and having a flap valve that is opened by a water pressure discharged by the pump on the discharge side of the pump case and is closed by its own weight. In addition to providing an open / closed state detection sensor that outputs a signal along with opening and closing, an abnormality detection unit that detects an abnormality of the flap valve based on the operation state of the pump and the output signal of the open / closed state detection sensor is provided. is there.

  According to the above-described configuration, the flap valve operating state assumed based on the operating state of the pump, such as when the pump that opens and closes the flap valve is operating or stopped, and the output signal of the open / closed state detection sensor at that time Therefore, the abnormality of the flap valve can be accurately determined.

  In the third feature configuration, as described in claim 3, in addition to the first or second feature configuration, the open / close state detection sensor is a plurality of sensors that detect the open / close state of the flap valve. The point is that it is composed.

  According to the above-described configuration, by redundantly arranging the sensors that detect the open / closed state of the flap valve, even if one of them is in failure, the other can be accurately detected.

  In the fourth feature configuration, as described in claim 4, in addition to the third feature configuration described above, the open / close state detection sensor is a plurality of sensors that detect the open / close state of the flap valve based on different principles. The point is that it is composed.

  By redundantly arranging the sensors that detect the open / closed state of the flap valve, even if one is in failure, the other can be detected accurately, but at that time, use sensors with different detection principles. As a result, the reliability can be further improved. That is, there are various causes for the failure of the sensor, but by using sensors with different detection principles, the probability of simultaneous failure due to the same cause can be greatly reduced.

  In the fifth feature configuration, in addition to the second feature configuration described above, the open / close state detection sensor includes a plurality of sensors that detect the open / close state of the flap valve. The abnormality detection unit is configured to detect an abnormality of the flap valve and the opening / closing state detection sensor based on an operation state of the pump and an output signal of the opening / closing state detection sensor.

  According to the above configuration, when determining whether or not the flap valve is abnormal based on the operation state of the pump and the output signal of any of the plurality of open / close state detection sensors, the other open / close state detection sensors By referring to the output signal, it is possible to determine the abnormality of the open / close state detection sensor itself in addition to the abnormality of the flap valve.

  In the sixth feature configuration, as described in claim 6, in addition to the fifth feature configuration described above, the open / close state detection sensor is a plurality of sensors that detect the open / close state of the flap valve based on different principles. The point is that it is composed.

  According to the above configuration, the reliability of abnormality determination can be further enhanced by using sensors with different detection principles. In other words, the cause of sensor failure varies, but by using sensors with different detection principles, the probability of simultaneous failure due to the same cause can be greatly reduced, thereby ensuring the reliability of abnormality determination. Will be able to.

  According to a seventh feature configuration, in addition to the above-described fourth or sixth feature configuration, the open / closed state detection sensor may include at least another physical quantity that varies with the opening / closing operation of the flap valve. This is because a sensor for detecting fluctuations in the above is used.

  For example, normally, other physical quantities related to the pump gate change with a mechanical operation such as opening / closing operation of the flap valve so that the water flow in the pump case or the water pipe is intermittently caused by opening / closing operation of the flap valve. By paying attention, it is possible to indirectly detect the opening / closing operation of the flap valve by detecting such other physical quantities.

  In the eighth feature configuration, as described in claim 8, in addition to the seventh feature configuration described above, the open / closed state detection sensor is a water flow sensor that detects at least a water flow or a flow direction of the pump case. There is in point.

  The water flow sensor detects whether there is a water flow in the pump case or in which direction the flow is, and is provided, for example, in the pipe body of the flap valve mechanism, and at least when the flap valve is open When a flow is detected and occluded, no flow is detected. Therefore, the open / closed state of the flap valve can be indirectly detected by such a sensor.

  The first characteristic configuration of the abnormality detection method of the flap valve of the pump gate according to the present invention is the water stop gate door body which is installed at the boundary between the first water channel and the second water channel and can be opened and closed as described in claim 9. A flap valve mechanism is formed by penetrating and forming a water pipe that communicates between both water channels, and a pump case is attached to the water pipe, and is opened by the water pressure discharged by the pump on the discharge side of the pump case and closed by its own weight. An abnormality detection method for a flap valve of a pump gate comprising the operation state of the pump, and based on output signals of a plurality of open / close state detection sensors that output signals in accordance with opening / closing of the flap valve, The point is to detect abnormality of the flap valve and the open / closed state detection sensor.

  According to the above configuration, when determining whether or not the flap valve is abnormal based on the operation state of the pump and the output signal of any of the plurality of open / close state detection sensors, the other open / close state detection sensors By referring to the output signal, it is possible to determine the abnormality of the open / close state detection sensor itself in addition to the abnormality of the flap valve.

  In the second feature configuration, as described in claim 10, in addition to the first feature configuration described above, the open / closed state detection sensor is a water flow sensor that detects at least a water flow or a flow direction of the pump case. There is in point.

  The water flow sensor detects whether there is a water flow in the pump case or in which direction the flow is, and is provided, for example, in the pipe body of the flap valve mechanism, and at least when the flap valve is open When a flow is detected and occluded, no flow is detected. Therefore, according to the above-described configuration, the open / close state of the flap valve can be indirectly detected by such a sensor.

  As described above, according to the present invention, it is possible to reduce the occurrence of the accident of breakage of the flap valve open / close state detection sensor and provide a pump gate that can be detected stably and accurately. It is now possible to provide a pump gate equipped with an abnormality detection unit capable of accurately diagnosing the abnormality and a method for detecting abnormality of the flap valve of the pump gate.

  Embodiments of the pump gate according to the present invention will be described below. As shown in FIG. 1, the pump gate 3 is installed in the boundary part which is the confluence | merging point of the tributary river 1 as a 1st waterway, and the mainstream river 2 as a 2nd waterway. The pump gate 3 includes left and right sluice columns (not shown) erected at the boundary, a floor member 4b horizontally disposed between the sluice columns at the bottom of the water channel, a roof 4c, and a steel plate. The water stop gate door body 6 is supported by an elevating mechanism 7 having an electric motor disposed on the top 4c so as to be opened and closed.

  The water stop gate body 6 is moved up and down while sliding to a door stop 4d formed extending in the width direction of the water channel from the top 4c, and provided at the lower end of the water stop gate door body 6 at the lowered position. The seal member 4e comes into contact with the metal floor member 4b and is sealed.

  A water passage 6a is formed through the lower portion of the center of the water stop gate body 6 so that the two water passages communicate with each other. A pump case 8 in which a pump 9 is housed is flange-connected to the water passage 6a. A suction cover 8a having an opening 8b formed obliquely downward is flange-connected to the suction side end of the pump 9 and the pump 9 is connected to the end of the tube 10b flanged to the discharge side end of the pump case 8. A flap valve 10a that is released by the water pressure discharged by the cylinder and is closed by its own weight is attached to the horizontal axis 11 so as to be swingable. That is, the flap valve mechanism 10 is constituted by the flap valve 10a and the tubular body 10b.

  The pump gate 3 is configured such that water flows down naturally from a tributary river 1 as a first water channel 2 to a main river 2 as a second water channel in an open state in which the water stop gate body 6 is raised. When the water level of the main river 2 rises from the water level of the tributary river 1 due to the increase of water, the reverse flow from the main river 2 to the tributary river 1 is avoided in the closed state where the water stop gate door 6 is lowered. The pump 9 is operated to transfer water from the tributary river 1 to the main river 2. The pump 9 is connected to a pump case 8 having a circular cross section that is flange-connected in the thickness direction of the water stop gate body 6. The motor unit 9a is provided in the interior and is arranged coaxially with the pump case 8, and an impeller 9b key-connected to the drive shaft of the motor unit 9a.

  That is, by operating the pump 9 in the closed state in which the water stop gate body 6 is lowered, the water of the tributary river 1 is sucked from the suction side end of the pump 9, and the flap valve 10a is caused by the water pressure. Is drained from the discharge side end into the main river 2 and when the pump 9 is stopped when the water stop gate body 6 is closed, the flow from the tributary river 1 to the main river 2 The drainage is stopped and the flap valve 10a is automatically closed by the combined action of its own weight and the water pressure of the main river 2 to prevent the backflow of water from the main river 2 to the tributary river 1.

  As shown in FIG. 2, the tubular body 10b is provided with a limit switch R1 as a first open / closed state detection sensor that outputs a signal when the flap valve 10a is opened and closed, and is provided on the outer peripheral surface of the tubular body 10b. A water flow sensor R2 is provided as a second open / closed state detection sensor for detecting the water flow flowing in the pump case 8. The limit switch R1 detects the mechanical operation of the flap valve 12a, and the water flow sensor R2 detects the open / closed state of the flap valve 10a by the water flow around the tube 10b accompanying the water flow in the pump case 8. These are detected by different principles.

  More specifically, the limit switch R1 includes a housing R10 in which an electrical contact portion is enclosed, a swing arm R11 that is spring-biased in a horizontal direction to open and close the electrical contact portion, and a tip of the swing arm R11. A swing that swings when the roller R12 of the swing arm R11 contacts the surface of the flap valve 10a on the tube body 10b side by the closing operation of the flap valve 10a. The electrical contact portion is brought into contact with the arm R11, while the electrical contact portion is opened in conjunction with the swing arm R11 swinging in the reverse direction by the opening operation of the flap valve 10a. The tube 10b side surface of the flap valve 10a that contacts the roller R12, that is, the open / close detection unit, is larger than the outer diameter of the tube 10b so as to be positioned on the outer peripheral side of the tube 10b. It is formed to extend. By configuring the open / close detection unit in this way, foreign matter hardly collides with or becomes entangled with the detection unit, so that a damage accident can be prevented and detection can be performed stably and accurately.

  The water flow sensor R2 includes a housing R20 in which a heating element and a temperature detection element are enclosed, and is attached to the outer surface of the tube body 10b. The sensor is based on the presence or absence of water flow around the tube body 10b due to the water flow in the tube body 10b. Based on the temperature change, it is configured to detect the presence or absence of water flow in the tube body 10b. Accordingly, even when solid foreign matters are floating in the water flowing through the tube body 10b, they are attached at positions where damage due to collision of such solid foreign matters does not occur.

  Thus, by using a plurality of sensors having different detection principles, redundancy can be ensured and reliability can be further enhanced. That is, there are various causes for the failure of the sensor, but by using sensors with different detection principles, the probability of simultaneous failure due to the same cause can be greatly reduced.

  More specifically, the water flow sensor R2 is a sensor that detects at least another physical quantity that fluctuates with the opening / closing operation of the flap valve 10a, that is, a change in water flow, and indirectly detects the opening / closing operation of the flap valve. Is.

  The above-described pump gate 3 is provided with water level sensors WS2 and WS1 for detecting the water levels of the main river 2 and the tributary river 1, and the raising / lowering mechanism 7 is operated based on the detected water level to thereby stop the water stop gate door body. 6 is provided to control opening / closing of the pump 9 and to control the operation / stop of the pump 9. The control unit 20 is controlled based on the operation state of the pump 9 and the output signals of the opening / closing state detection sensors R1 and R2. An abnormality detection unit 30 for detecting an abnormality in the flap valve 10a and the open / closed state detection sensors R1 and R2 is provided. When an abnormality is detected by the abnormality detecting unit 30, the monitoring center is notified via a communication line.

  As shown in FIG. 3, the control unit 20 includes an input port to which the output signals of the water level sensors WS2 and WS1, the output signals of the limit switch R1 and the water flow sensor R2 are input, and the electric motor of the elevating mechanism 7. The microcomputer MC is provided with an output port that drives the pump 9 in the forward / reverse direction, an output port that operates the pump 9, and an output port that outputs an abnormal signal to the abnormality reporting unit 21 that outputs an abnormal state to the outside.

  When the water level (outside water level) of the main river 2 is equal to or lower than a predetermined value, the control unit 20 drives the electric motor to rotate forward to open the water stop gate body 6 to naturally flow down, and exceeds the predetermined water level. When this happens, the electric motor is driven in reverse to close the water stop gate door body 6 and perform water stop control. When the water level of the tributary river 1 exceeds the predetermined value and reaches the pump operating water level during the water stop control, the pump 9 is operated to drain into the main river 2, and the water level of the tributary river 1 falls to the predetermined pump stop water level. The pump 9 is controlled to stop.

  As shown in FIG. 4, the abnormality detection unit 30 detects the operating state of the pump when the outside water level is equal to or higher than the inside water level, that is, when the water stop gate body is closed (S1). S2) If it is stopped, it is determined whether the flap valve is closed. That is, the presence or absence of water flow is determined by the water flow sensor (S3). If the flow is detected, the open / close state of the flap valve is detected based on the output of the limit switch (S4), and the open state is determined based on both sensors. When it is detected that there is a flap valve, it is determined that the flap valve is reversely opened due to abnormal opening, and an abnormal flag is set (S5). If it is detected in step S4 that the flap valve is closed based on the output of the limit switch, it is determined that a reverse flow has occurred on the safe side (S6), and an error has occurred in any of the sensors. Is determined, and an abnormality flag is set (S7).

  In step S3, if no water flow is detected by the water flow sensor, the open / close state of the flap valve is detected based on the output of the limit switch (S8), and when it is detected that the valve is in the open state, backflow occurs. If it is present, it is determined to be safe (S9), it is determined that an abnormality has occurred in any of the sensors, and an abnormality flag is set (S10). If it is detected in step S8 that the block is in the closed state, it is determined that the block is in the closed state based on both sensors.

  When it is determined in step S2 that the pump is in an operating state, if the flow is not detected by the water flow sensor (S12), it is determined that the water flow sensor is abnormal and an abnormality flag is set (S15). When the flow is detected by the water flow sensor (S12), the open / close state of the flap valve by the limit switch is detected (S13). It is determined that the drainage is normally forced by detecting that the flap valve is open (S14), and it is determined that the limit switch is abnormal by detecting that the flap valve is closed, and an abnormal flag is set. (S16). In step S1, when the outside water level is lower than the inside water level, the water stop gate body is opened, and the water flows naturally from the tributary river to the main river.

  When it is confirmed that the abnormality flag has been set (S17), an abnormality state signal is output to the abnormality reporting unit (S18), and the abnormality reporting unit notifies the monitoring center via a communication line. Here, the abnormality flag is composed of a plurality of flags indicating the type of abnormality detected, and an abnormality state signal corresponding to the state of the flag is output. In addition, the abnormality reporting unit is composed of a public line terminal.

  Here, when it is determined that a backflow has occurred due to a flap valve blockage abnormality, the abnormality detection unit 30 does not immediately report an abnormality, but the control unit 20 uses a water level sensor to determine whether or not to operate the pump. After judging based on the detected water level, the pump is operated to pump water from the tributary river to the main river, and the abnormal state is not released after repeating the cause of backflow, that is, foreign matter biting and entanglement removal a predetermined number of times. You may comprise so that an abnormality notification part may be actuated in a case.

  Hereinafter, another embodiment will be described. In the above-described embodiment, a description has been given of a configuration in which an electric contact type limit switch and a water flow sensor are configured as a plurality of open / close state detection sensors for detecting the open / close state of the flap valve based on different principles, but the types of sensors are limited to these. For example, it is also possible to use other known position detection sensors such as a non-contact sensor that detects a change in capacitance or the like instead of an electric contact type limit switch. Regardless of which sensor is used, the detection part of the open / close state detection sensor that outputs a signal when the flap valve is opened / closed is provided on the outer peripheral side of the flap valve mechanism to prevent collision of floating foreign matter. Failure due to entanglement can be avoided.

  The water flow sensor is employed as a sensor for detecting the presence or absence of a water flow as a change in other physical quantities that fluctuates with the opening / closing operation of the flap valve, but a flow direction sensor that detects the direction of the water flow can also be used. is there. As the flow direction sensor, for example, an electromagnetic flow direction meter that generates a voltage having a polarity corresponding to the flow direction with a voltage proportional to the flow rate when a water flow is generated in the magnetic field can be used.

  In the above-described embodiment, the open / close state detection sensor that outputs a signal along with the opening / closing of the flap valve has been described as being provided on the outer peripheral side of the tubular body of the flap valve mechanism. Is not required to be directly below the pipe body as long as it is on the outer peripheral part side of the pipe body, and may be at a position where at least the backflow caused by the occurrence of a blockage abnormality in the flap valve is detectable.

  When using a flow direction sensor, it is possible to determine whether or not a reverse flow has occurred due to the detected flow direction when the pump is stopped based on the operating state of the pump and the flow direction detected by the flow direction sensor. An abnormality of the sensor can be detected by the detected flow direction.

  In the above-described embodiment, the abnormality detection unit has been described that detects and reports the abnormality of the flap valve and the open / closed state detection sensor based on the output signal of the operation state of the pump and the open / closed state detection sensor. The abnormality of the flap valve may be detected and displayed based on the output signal of the operating state and the open / closed state detection sensor.

  In the above-described embodiment, the example in which the pump gate is constructed at the boundary portion that is the confluence of the tributary river 1 as one water channel and the main river 2 as the other water channel has been described, but the construction position of the pump gate according to the present invention Is not limited to this, and the type of the water channel is not questioned as long as it is constructed at the boundary between one water channel and the other water channel. Moreover, it cannot be overemphasized that the case where one water channel and the other water channel correspond to the upstream and downstream sides of the same water channel is included. 1 is a counter pressure type pump gate having a door stop on the surface of the main river 2 side of the door body 6, the door 6 has a surface on the side of the tributary river 1 as a door stop. It may be a positive pressure type pump gate.

Longitudinal section of a pump gate according to the invention The principal part of the pump gate by this invention is shown, (a) is a top view of the pump casing to which the flap valve mechanism was connected, (b) is the side view, (c) is the right side view Explanatory drawing of control part and abnormality detection part Flowchart explaining an abnormality detection algorithm by the abnormality detection unit

Explanation of symbols

1: First waterway (a tributary river)
2: Second waterway (mainstream river)
3: Pump gate 6: Water stop gate door body 7: Elevating mechanism 8: Pump case 9: Pump 10: Flap valve mechanism 10a: Flap valve 10b: Tube

Claims (10)

A water passage pipe, which is installed at the boundary between the first water channel and the second water channel and allows the water channel to communicate between the two water channels, is formed through the water stop gate body that can be freely opened and closed. It is a pump gate provided with a flap valve mechanism that is opened by water pressure discharged by a pump on the side and closed by its own weight,
The pump gate which provided the opening-and-closing state detection sensor which outputs a signal with opening and closing of the said flap valve in the pipe body outer peripheral part side of the said flap valve mechanism. A water passage pipe, which is installed at the boundary between the first water channel and the second water channel and allows the water channel to communicate between the two water channels, is formed through the water stop gate body that can be freely opened and closed. It is a pump gate provided with a flap valve mechanism that is opened by water pressure discharged by a pump on the side and closed by its own weight,
An opening / closing state detection sensor that outputs a signal in accordance with opening / closing of the flap valve is provided, and an abnormality detection unit that detects an abnormality of the flap valve based on an operation signal of the pump and an output signal of the opening / closing state detection sensor is provided. Pump gate.   The pump gate according to claim 1 or 2, wherein the open / closed state detection sensor includes a plurality of sensors that detect the open / closed state of the flap valve.   The pump gate according to claim 3, wherein the open / closed state detection sensor includes a plurality of sensors that detect the open / closed state of the flap valve based on different principles.   The open / closed state detection sensor includes a plurality of sensors that detect the open / closed state of the flap valve, and the abnormality detection unit includes the flap valve and the open / closed state detection sensor based on an output signal of the pump and an open / closed state detection sensor. The pump gate according to claim 2, wherein an abnormality of the open / closed state detection sensor is detected.   6. The pump gate according to claim 5, wherein the open / close state detection sensor includes a plurality of sensors that detect the open / close state of the flap valve based on different principles.   The pump gate according to claim 4 or 6, wherein the open / closed state detection sensor is a sensor that detects a change in at least another physical quantity that fluctuates with an opening / closing operation of the flap valve.   The pump gate according to claim 7, wherein the open / closed state detection sensor is a water flow sensor that detects a water flow or a flow direction of the pump case. A water passage pipe, which is installed at the boundary between the first water channel and the second water channel and allows the water channel to communicate between both water channels, is formed through the water stop gate body which can be opened and closed. A pump case is attached to the water conduit, and the discharge of the pump case An abnormality detection method for a flap valve of a pump gate that is provided with a flap valve mechanism that is opened by water pressure discharged by a pump to the closed side and closed by its own weight,
Based on the operation state of the pump and output signals of a plurality of open / close state detection sensors that output signals in accordance with opening / closing of the flap valve, a pump gate for detecting an abnormality in the flap valve and the open / close state detection sensor Anomaly detection method.   The pump gate abnormality detection method according to claim 9, wherein the open / closed state detection sensor is a water flow sensor that detects at least a water flow or a flow direction of the pump case.

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