JP2019158463A - Water level sensor, point flow speed sensor, and opening degree sensor - Google Patents

Abstract

To provide a water level sensor capable of detecting water level with high accuracy at low cost.SOLUTION: A base 22 is rotatable in the forward and reverse directions within a range of a predetermined angle around a rotation shaft 21. A float 26 rotating the base 22 is attached to the base 22 while being floated over a position in the height direction according to a water level. To the base 22, an acceleration sensor unit 23 is attached having an acceleration sensor 25 for detecting an angle in the rotation direction of the base 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water level sensor, a point flow velocity sensor, and an opening degree sensor.

  The water level sensor detects the water level when the river level or the river water overflows into the inland water and is submerged (see Patent Document 1). The point flow velocity sensor detects the point flow velocity of the river (see Patent Document 2). The gate of Xiamen needs to be properly managed in opening (see Patent Document 3).

Japanese Utility Model Publication 3-45148 JP 2008-190908 A Japanese Patent Laid-Open No. 10-266160

  There is a need for a water level sensor that can detect the water level with high accuracy while being low cost, and a point flow velocity sensor that can detect the point flow velocity of the river with high accuracy while being low cost. There is a need for an opening sensor that can detect the opening of a self-weight flap gate provided in Xiamen with high accuracy while being low in cost.

  The present invention provides a water level sensor that can detect a water level with high accuracy while being low-cost, a point flow velocity sensor that can detect point flow velocity of a river with high accuracy while being low-cost, and the opening of a self-weighted flap gate provided in a lock gate. An object of the present invention is to provide an opening degree sensor capable of detecting the degree of accuracy with high accuracy at a low cost.

The present invention includes a base that is rotatable in a forward and reverse direction within a predetermined angle range around a rotation axis;
A float that is attached to the base and floats to a position in the height direction according to the water level to rotate the base, and an acceleration sensor that is attached to the base and detects an angle in the rotation direction of the base. A water level sensor comprising an acceleration sensor unit is provided.

  The present invention relates to an acceleration sensor having a rotating body that rotates in a forward / reverse direction within a predetermined angle range around a rotation axis by a water flow, and an acceleration sensor that is attached to the rotating body and detects the angle of the rotating body. A point flow rate sensor comprising the unit.

The present invention has a case attached to a self-weight type flap gate provided in a lock and an acceleration sensor for detecting the opening degree of the self-weight type flap gate, and within a predetermined angle range inside the case. An opening degree sensor provided with an acceleration sensor unit which is rotatably provided and is fixed in a state where an angle with respect to the case is adjusted.
I will provide a.

  According to the water level sensor of the present invention, the water level can be detected with high accuracy while being low in cost. According to the point flow velocity sensor of the present invention, the point flow velocity of a river can be detected with high accuracy while being low in cost. According to the opening sensor of the present invention, it is possible to detect the opening of the self-weight flap gate provided in the lock gate with high accuracy while being low in cost.

It is a top view which shows the state which removed the cover of the water level sensor of one Embodiment. It is a circuit diagram which shows the circuit board with which the acceleration sensor was mounted. It is sectional drawing which shows the acceleration sensor unit which has arrange | positioned the acceleration sensor and the circuit board in the case. It is a block diagram which shows the structural example of the data transmission part connected to the water level sensor of one Embodiment. It is a conceptual diagram which shows an example of the relationship between the angle of the float of the water level sensor of one Embodiment, and a water level. It is a figure which shows an example of the relationship between the angle of the float of the water level sensor of one Embodiment, and a water level numerically. It is a figure which shows the partial relationship between the angle of the float of the water level sensor of one Embodiment, and a water level with a detailed numerical value. It is a graph which shows an example of the relationship between the angle of the float of the water level sensor of one Embodiment, and a water level. It is a top view which shows the state which removed the lid | cover of the point flow velocity sensor of one Embodiment. It is a graph which shows an example of the relationship between the voltage output from the acceleration sensor of the point flow velocity sensor of one Embodiment, and the angle of a detection arm. It is a graph which shows an example of the relationship between the angle detected by the acceleration sensor of the point flow velocity sensor of one Embodiment, and a point flow velocity. It is a top view which shows the state which removed the lid | cover of the opening degree sensor of one Embodiment. It is a conceptual diagram which shows the state which attached the opening degree sensor of one Embodiment to the self-weight type flap gate.

  Hereinafter, the water level sensor, the point flow velocity sensor, and the opening degree sensor of each embodiment will be described with reference to the accompanying drawings.

<Water level sensor>
In FIG. 1, the water level sensor 11 has shown the state which removed the cover. For example, a rectangular base 22 having a predetermined length is attached to a rotary shaft 21 attached to the bottom surface of a case 111 made of stainless steel so as to be rotatable in forward and reverse directions. In FIG. 1, if the clockwise rotation is the forward rotation, the counterclockwise rotation is the reverse rotation.

  An acceleration sensor unit 23 is attached to a position near the rotation shaft 21 of the base 22. The acceleration sensor unit 23 includes a circuit board 24 and an acceleration sensor 25 mounted on the circuit board 24.

  A cylindrical hollow float 26 is attached to the end of the base 22 opposite to the rotating shaft 21. The float 26 is formed, for example, by welding so that the open surfaces of the cylindrical pipes 26a and 26b whose one surface is open are opposed to each other to maintain airtightness. The pipes 26a and 26b are made of, for example, vinyl chloride.

  Three circular water inlet holes 112 are formed on the lower surface of the case 111, and three circular exhaust holes 113 are formed on the upper surface. The shape and number of the water inflow holes 112 and the exhaust holes 113 are not limited.

  As an example, it is assumed that the water level sensor 11 is attached to a predetermined support on the side of the house (inside water) from the river bank. If the inland water is flooded due to river overflow or bank breakage, the water enters from the water inflow hole 112 and the water level rises. Then, as shown by a two-dot chain line in FIG. 1, the float 26 floats to a position in the height direction corresponding to the water level, and rotates the base 22 in the forward direction. The base 22 and the float 26 rotate in forward and reverse directions within a predetermined angle range according to the water level.

  Since the acceleration sensor unit 23 also rotates with the rotation of the base 22, the acceleration sensor 25 detects the angle of the rotation direction of the base 22. The detection value (voltage value) generated by the acceleration sensor 25 is output to the outside of the water level sensor 11 via the cable CB. Electric power is supplied to the acceleration sensor 25 from the outside via the cable CB.

  Details of the circuit board 24 and the acceleration sensor 25 will be described with reference to FIG. The acceleration sensor 25 is an acceleration sensor that detects X-axis, Y-axis, and Z-axis accelerations, and is configured such that a detection value obtained by detecting the X-axis acceleration is extracted from a terminal 246 via a resistor R2. ing. The power supplied from the terminal 245 is supplied to the 5V terminal and enable (EN) terminal of the acceleration sensor 25 via the resistor R1. The 0V terminal and the self test (ST) terminal of the acceleration sensor 25 are connected to the terminal 247 via the resistor R3.

  The circuit board 24 includes a protection circuit 240 in which resistors R1 to R3 and surge absorbers 241 to 244 are connected as illustrated. The protection circuit 240 protects the acceleration sensor 25 by reducing the voltage so that a high voltage due to an induced lightning surge is not applied to the acceleration sensor 25. The circuit board 24 has capacitors C1 and C2 for removing the ripple voltage connected as shown.

  As shown in FIG. 3, the acceleration sensor unit 23 has a case 230 made of, for example, vinyl chloride whose upper surface is open. A circuit board 24 on which the acceleration sensor 25 is mounted is disposed on the bottom surface of the case 230. The circuit board 24 and the acceleration sensor 25 are covered with a soft resin 231, and the hard resin 232 is filled up to the upper end surface of the case 230 above the soft resin 231. Therefore, the circuit board 24 and the acceleration sensor 25 do not touch water.

  As shown in FIG. 4, a data transmission unit 50 is connected to the water level sensor 11. The data transmission unit 50 is attached above the column to which the water level sensor 11 is attached in a state of being separated from the water level sensor 11 by a predetermined distance.

  The data transmission unit 50 includes an A / D converter 51 that performs A / D conversion on the detection value supplied from the water level sensor 11 via the cable CB, and a central processing unit 52 that converts the detection value of the digital value into water level data (hereinafter referred to as “water level data”). , CPU 52) and a wireless device 53 for wirelessly transmitting water level data. The data transmission unit 50 includes a power supply unit 54 that supplies power to each unit in the data transmission unit 50 and the water level sensor 11. The power supply unit 54 may be a solar panel and a rechargeable battery, or may be a precharged rechargeable battery or a dry battery.

  The wireless device 53 transmits water level data based on the rotation direction angle of the base 22 detected by the water level sensor 11 to a relay station or a monitoring office that monitors the river.

  As shown in FIG. 5, when the state in which the float 26 is rotated to the state where the side surface of the float 26 is parallel to the ground is defined as an angle of 0 degrees, the float 26 rotates in a range of −61 degrees to 61 degrees. The relationship between the angle θ and the water level H at this time is as shown in FIG. FIG. 7 shows the water level H when the range from −60.0 degrees to −58.0 degrees is changed in units of one decimal place. As shown in FIG. 7, according to the water level sensor 11, the angle can be detected with a resolution of 0.1 degree, and the water level can be detected with high accuracy in units of 1 mm. Moreover, since the acceleration sensor 25 is inexpensive, the water level sensor 11 can be manufactured at low cost.

  FIG. 8 is a graph showing the relationship between the angle of the float 26 (base 22) and the water level H. The CPU 52 can convert the angle of the base 22 detected by the water level sensor 11 into the water level H based on the relationship between the angle θ and the water level H as shown in FIG.

<Point flow velocity sensor>
The point flow velocity sensor 12 shown in FIG. 9 can be configured using parts common to the parts constituting the water level sensor 11 shown in FIG. 9, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof may be omitted.

  In FIG. 9, the point flow velocity sensor 12 shows a state where the lid is removed. For example, a base 22 is attached to a rotating shaft 21 attached to the bottom surface of a case 121 made of stainless steel so as to be rotatable in forward and reverse directions. In FIG. 9, if the counterclockwise rotation is the forward rotation, the clockwise rotation is the reverse rotation. An acceleration sensor unit 23 is attached to a position near the rotation shaft 21 of the base 22.

  A detection arm 27 is attached to the end of the base 22 opposite to the rotation shaft 21. An opening 122 is formed on the lower surface of the case 121. The lower surface of the case 121 is a surface facing downward (river bed side) when the point flow velocity sensor 12 is installed in water. A part of the detection arm 27 protrudes from the opening 122 to the outside of the case 121. The opening 122 may be a slit through which the detection arm 27 passes.

  A balance weight 28 is attached to the acceleration sensor unit 23. The balance weight 28 is attached to the case 230 of the acceleration sensor unit 23 by a fixture such as a screw. The balance weight 28 is provided to rotate the detection arm 27 in advance by a predetermined angle at the lowest flow rate of the water flow detected by the point flow velocity sensor 12 (for example, a flow velocity of 0 m / s). As shown in FIG. 9, the balance weight 28 is attached to the acceleration sensor unit 23, so that the detection arm 27 can be positioned at one end of the opening 122 when the flow velocity is 0 m / s. . By removing the balance weight 28, the detection arm 27 can be positioned at the center of the opening 122.

  The balance weight 28 sets the zero point when the detection arm 27 is rotated by a predetermined angle in advance to the upstream side and the detection arm 27 is rotated to one end. The zero point is the lowest flow velocity detected by the point flow velocity sensor 12. That is, the balance weight 28 determines the minimum flow velocity. It is also possible to set the minimum flow rate to a flow rate greater than 0 m / s.

  The detection arm 27 is, for example, a cylindrical bar. The detection arm 27 may be a square columnar rod or a plate. The detection arm 27 is made of, for example, stainless steel. The flowing water cross-sectional area can be changed by changing the length or thickness of the detection arm 27. Thereby, the measurement range of the point flow velocity by the point flow velocity sensor 12 can be changed to 0 to 1 m / s or 0 to 5 m / s, for example.

  The base 22, the acceleration sensor unit 23, and the detection arm 27 integrally rotate within a predetermined angle range about the rotation shaft 21. The range of the rotation angle is, for example, 30 degrees in the left-right direction around the center line indicated by the alternate long and short dash line. In the configuration shown in FIG. 9, the base 22 and the detection arm 27 are separate, but they may be integrated. The point flow velocity sensor 12 includes a rotating body that rotates in a forward and reverse direction within a predetermined angle range around a rotation axis by a water flow, and the acceleration sensor unit 23 may be attached to the rotating body.

  When the detection arm 27 rotates in the right direction in FIG. 9 due to the water flow, the angle in the rotation direction of the acceleration sensor unit 23 changes. Therefore, the acceleration sensor 25 can detect the angle of the detection arm 27 in the rotation direction. The detection value (voltage value) generated by the acceleration sensor 25 is output to the outside of the point flow velocity sensor 12 via the cable CB.

  The data transmission unit 50 shown in FIG. 4 is supplied with detection values from the point flow velocity sensor 12 instead of the water level sensor 11. The point flow velocity sensor 12 is fixed to, for example, H steel, which is an example of a river structure provided in the river, and the data transmission unit 50 is fixed to the H steel so as to be positioned above the water surface. . The wireless device 53 transmits point flow velocity data based on the rotation direction angle of the detection arm 27 detected by the point flow velocity sensor 12 to a relay station or a monitoring office that monitors the river.

  FIG. 10 shows the relationship between the voltage value generated by the acceleration sensor 25 and the angle of the detection arm 27. In the configuration shown in FIG. 9, the detection arm 27 does not rotate in the range of −90 degrees to 90 degrees, but FIG. 10 shows voltage values in the range of −90 degrees to 90 degrees. FIG. 11 shows the relationship between the angle of the detection arm 27 and the point flow velocity. Based on the relationship between the voltage value generated by the acceleration sensor 25 as shown in FIG. 10 and the angle of the detection arm 27 and the relationship between the angle of the detection arm 27 and the point flow velocity as shown in FIG. Point velocity data can be generated.

  The CPU 52 may generate the point flow velocity data based on a conversion table or a conversion formula that directly converts the voltage value generated by the acceleration sensor 25 into a point flow velocity.

<Opening sensor>
The opening degree sensor 13 shown in FIG. 12 can be configured using parts common to the parts constituting the water level sensor 11 shown in FIG. Therefore, in FIG. 12, the same components as those in FIG.

  In FIG. 12, the opening degree sensor 13 has shown the state which removed the cover. For example, a base 22 is attached to a rotating shaft 21 attached to the bottom surface of a case 131 made of stainless steel so as to be rotatable in the forward and reverse directions within a predetermined angle range. In FIG. 12, if the rotation in one of the clockwise and counterclockwise directions is the forward rotation, the rotation in the other direction is the reverse rotation. An acceleration sensor unit 23 is attached to a position near the rotation shaft 21 of the base 22.

  A plurality of screw holes 32 are formed on the bottom surface of the case 131 along an arcuate path through which an end of the base 22 opposite to the rotation shaft 21 passes. By fixing the screw 31 to any one of the plurality of screw holes 32, the base 22 can be fixed to the case 131 at a predetermined angle. Thereby, the acceleration sensor unit 23 is fixed to the case 131 at a predetermined angle.

  As shown in FIG. 13, a lock 70 is provided below the embankment 60 so as to penetrate the river front and back. The lock gate 70 is provided with a self-weight flap gate 80. During normal water, the self-weight flap gate 80 is opened by the water flowing from the river back side to the river front side, and the water is drained from the gap to the river 90. When the water level of the river 90 rises during a flood, the self-weight flap gate 80 is fully closed by the water pressure from the river front side, and backflow to the river back side is prevented.

  However, if the self-weight flap gate 80 is not fully closed due to driftwood, sediment, or the like, the water in the river 90 may flow backward to the backside of the river and the inland water side may overflow. Therefore, it is necessary to monitor the opening degree of the self-weight flap gate 80.

  The opening degree sensor 13 shown in FIG. 12 is mounted on, for example, an upper protruding portion 81 that protrudes upward in the self-weight flap gate 80. A data transmission unit 50 shown in FIG. 4 is supplied with a detection value (voltage value) from the opening sensor 13 instead of the water level sensor 11. The data transmission unit 50 may be provided in the self-weight flap gate 80 (upward projecting portion 81), or may be provided in a position separated from the self-weight flap gate 80.

  As shown in FIG. 10, since the acceleration sensor 25 outputs a detection value corresponding to the angle, the CPU 52 can detect the opening degree of the self-weight flap gate 80 by converting the detection value into an angle. It is sufficient that the opening degree of the opening degree sensor 13 is detected in the range of 0 degrees to 90 degrees (or 0 degrees to -90 degrees). The wireless device 53 transmits the opening degree of the self-weight flap gate 80 based on the angle of the acceleration sensor 25 detected by the opening degree sensor 13 to a relay station or a monitoring office that monitors the river.

  The reason why the base 22 (acceleration sensor unit 23) can be fixed to the case 131 at a predetermined angle is as follows. As shown in FIG. 10, the angle detected by the acceleration sensor 25 has a large change in angle according to the voltage in the region near 90 degrees and −90 degrees. Therefore, the acceleration sensor 25 is preferably used in a region near 0 degrees where the change in angle according to the voltage is small.

  FIG. 12 shows the opening sensor 13 in a state where the angle of the acceleration sensor 25 is 0 degrees. When the opening sensor 13 is attached to the self-weight flap gate 80, the opening sensor 13 is not necessarily attached to the self-weight flap gate 80 while maintaining the state shown in FIG. Depending on the mounting position, it may be necessary to provide the opening sensor 13 with a predetermined angle in advance.

  In the configuration shown in FIG. 12, the base 22 is configured to be fixed at a predetermined angle with respect to the case 131, so that the acceleration sensor 25 corresponds to the posture when the opening sensor 13 is attached to the self-weight flap gate 80. The acceleration sensor unit 23 can be rotated so that the angle is as close to 0 degree as possible.

  In FIG. 12, the angle of the acceleration sensor unit 23 is adjusted by rotating the base 22, but only the acceleration sensor unit 23 is rotatably provided inside the case 131, and the acceleration sensor unit 23 may be configured to be fixed to the case 131 at a predetermined angle.

  The mechanism for adjusting and fixing the angle of the base 22 or the acceleration sensor unit 23 is not limited to the combination of the screw 31 and the screw hole 32. The opening sensor 13 only needs to have an arbitrary fixing mechanism that adjusts and fixes the angle of the acceleration sensor unit 23 with respect to the case 131.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the present invention.

11 Water Level Sensor 12 Point Flow Rate Sensor 13 Opening Sensor 21 Rotating Shaft 22 Base (Rotating Body)
23 Acceleration sensor unit 24 Circuit board 25 Acceleration sensor 26 Float 27 Detection arm (rotating body)
28 Balance weight 31 Screw 32 Screw hole 50 Data transmission part 60 Embankment 70 Lock gate 80 Self-weight flap gate 90 River 111, 121, 131 Case 112 Water inflow hole 113 Exhaust hole 122 Opening 240 Protection circuit

Claims (7)

A base that is rotatable in the forward and reverse directions within a predetermined angle range around the rotation axis;
A float attached to the base, levitating to a position in the height direction according to the water level, and rotating the base;
An acceleration sensor unit attached to the base and having an acceleration sensor for detecting an angle in a rotation direction of the base;
A water level sensor. The acceleration sensor unit includes a circuit board for supplying electric power to the acceleration sensor and outputting a detection value generated by the acceleration sensor;
The water level sensor according to claim 1, wherein the circuit board includes a protection circuit that protects the acceleration sensor from being applied with a high voltage due to an induced lightning surge. A rotating body that rotates forward and backward in a range of a predetermined angle around a rotation axis by a water flow;
An acceleration sensor unit attached to the rotating body and having an acceleration sensor for detecting an angle of the rotating body;
A point flow velocity sensor comprising: It further includes a case having a lower surface that faces downward when installed in water, and an opening is formed in the lower surface,
The rotating body is
A base rotatable in the forward and reverse directions within a range of the predetermined angle around the rotation axis;
A detection arm attached to the base, a part of which protrudes from the opening to the outside of the case, rotates around the rotation axis by a water flow, and rotates the base;
Have
The point flow velocity sensor according to claim 3, wherein the acceleration sensor unit is attached to the base. The acceleration sensor unit has a circuit board for supplying electric power to the acceleration sensor and outputting a detection value detected by the acceleration sensor;
The point flow velocity sensor according to claim 3, wherein the circuit board includes a protection circuit that protects the acceleration sensor from being applied with a high voltage due to an induced lightning surge. A case attached to a self-weight flap gate provided in Xiamen;
It has an acceleration sensor for detecting the opening degree of the self-weight flap gate, is rotatably provided within a predetermined angle range inside the case, and is fixed in a state where the angle with respect to the case is adjusted. Acceleration sensor unit,
An opening sensor comprising: The acceleration sensor unit has a circuit board for supplying electric power to the acceleration sensor and outputting a detection value detected by the acceleration sensor;
The opening sensor according to claim 6, wherein the circuit board includes a protection circuit that protects the acceleration sensor from being applied with a high voltage due to an induced lightning surge.

Images