JP2022041745A - Liquid level detection unit for drainage facility - Google Patents

Abstract

To provide a technology that prevents foreign matters from adhering to a float-type liquid level sensor while increasing the degree of freedom of installation of the liquid level sensor but making it easier to tilt and float.SOLUTION: A liquid level detection unit includes a float-type liquid level sensor 20 that is suspended in a drainage facility via a cable 30 and detects that the liquid level has reached a predetermined liquid level, and a support 12A that extends in the extending direction of the cable 30 in the drainage facility and supports the liquid level sensor 20 through the cable 30 in a floatable manner. While being supported by the support 12A, the extending direction of the axis x1 of the liquid level sensor 20, which extends from one end 21 to which the cable 30 is connected to the other end 22 opposite to the cable 30, intersects the extending direction of the cable 30.SELECTED DRAWING: Figure 5

Description

The present invention relates to a liquid level detection unit for drainage facilities.

In recent years, due to climate change, floods have occurred in various places. The occurrence of floods is increasing year by year, and the scale of disasters is also increasing. For example, when a sudden torrential rain occurs, a large amount of rainwater on the road will flow into sewers, rivers, gutters on the side of the road, and the like. If the amount of water that has flowed in exceeds expectations, it may overflow from sewers, rivers, gutters on the side of roads, etc., causing damage such as blockage of transportation networks and flooding of houses.

For example, a hanging rope and a plurality of float switches (liquid level sensors) are provided in a tubular member extending in the vertical direction inside a sewage tank (drainage facility) that stores sewage such as sewage and rainwater. A friction type liquid level detection device (liquid level detection unit) provided is known (see, for example, Patent Document 1). The liquid level detector is fixed in a case having a hollow inside. The float switch is turned on when tilted upward from a predetermined operating angle set above the horizontal, and detects an allowable predetermined liquid level (warning liquid level).

Japanese Unexamined Patent Publication No. 2012-26109

By the way, it is also important to detect the change in the liquid level in the rainwater mass provided around the house in order to know the occurrence of flood damage. In the rainwater mass, a grid-like lid such as grating is used. Through grating, more rainwater than expected may flow into the rainwater mass. When the liquid level rises sharply, a buoyancy force that pushes up the float switch in the vertical direction may act on the float switch as described in Patent Document 1.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a technique for making a float-type liquid level sensor tilt and easily lift.

In order to solve the above problems, the liquid level detection unit according to the present invention is a float type liquid level sensor that is suspended in a drainage facility via a cable and detects that the liquid level has reached a predetermined liquid level. And a support portion extending in the extending direction of the cable in the drainage facility and supporting the liquid level sensor in a floating manner via the cable, and the liquid level sensor is supported by the support portion. In the state, the extending direction of the axis extending from one end to which the cable is connected toward the other end on the opposite side of the cable intersects with the extending direction of the cable.

In the liquid level detection unit according to one aspect of the present invention, the extension support portion connected to the lower end of the support portion in the hanging direction of the liquid level sensor and the extension support portion via a cable different from the cable. The second liquid level is provided with a float type second liquid level sensor that is supported so as to be able to float and detects that the liquid level has reached a predetermined liquid level below the predetermined liquid level. In the sensor, the extension direction of the axis extending from one end to which the cable is connected toward the other end on the opposite side of the cable while being supported by the extension support portion intersects with the extension direction of the other cable. You may.

Further, in the liquid level detection unit according to one aspect of the present invention, the support portion and the extension support portion are plate-shaped members, and at least one of the support portion and the extension support portion extends in the hanging direction. Along each edge, the liquid level sensor and the second liquid level sensor have a pair of projecting plates protruding toward the side of the liquid level sensor, and the pair of projecting plates are the liquid level sensor and the second liquid level sensor. They are separated from each other so as to allow only lifting in a direction away from the support portion and the extension support portion.

Further, in the liquid level detection unit according to one aspect of the present invention, at least one of the support portion and the extension support portion is the cable and the other in the hanging direction of the liquid level sensor and the second liquid level sensor. It may have multiple fixing positions that allow the cable to be fixed.

Further, in the liquid level detection unit according to one aspect of the present invention, the liquid level sensor extends vertically from the support portion to the side where the liquid level sensor is supported at the upper end of the support portion in the hanging direction of the liquid level sensor. It has a mounting part that can be attached to the drainage facility.

Further, in order to solve the above problems, the liquid level detection unit according to the present invention is formed in a cylindrical shape with one end closed and the other end open, and has a short axis and a cross section orthogonal to the extending direction. A tubular member having a long axis and having a pair of short-axis side walls facing each other in the direction of the short axis and a pair of long-axis side walls facing each other in the direction of the long axis, and the cable. A float-type liquid level sensor that is suspended from one end of the tubular member toward the other end and is housed in the tubular member to detect that the liquid level has reached a predetermined liquid level. The cable for suspending the liquid level sensor is attached to one of the pair of long axis side wall portions, and the other side opposite to the cable from one end of the liquid level sensor to which the cable is connected. The axis of the liquid level sensor extending toward the end is characterized in that it is inclined from one of the long axis side wall portions toward the other side of the long axis side wall portion.

Further, in the liquid level detection unit according to one aspect of the present invention, the distance between the pair of short axis side wall portions is set so as to prevent the liquid level sensor from floating along the short axis, and the pair. The distance between the side wall portions of the long axis may be set so that the liquid level sensor floats along the long axis to allow the detection of the predetermined liquid level.

Further, in the liquid level detection unit according to one aspect of the present invention, the tubular member has at least one hole on the one end side with respect to the liquid level sensor in a state where the liquid level sensor is suspended. is doing.

Further, in the liquid level detection unit according to one aspect of the present invention, at least one first one of the closed end of the tubular member projects along the short axis side wall portion to the side opposite to the other end. It has a rib and at least one second rib that projects along the long axis side wall portion to the side opposite to the other end, and the at least one first rib and the at least one second rib. , A binding tool that binds the tubular member to the drainage facility can be supported.

Further, in the liquid level detection unit according to one aspect of the present invention, the liquid level detection unit is suspended below the liquid level sensor from one end to the other end of the tubular member via a cable different from the cable. It is further provided with a float-type second liquid level sensor that is housed in a tubular member and detects that another predetermined liquid level has been reached below the liquid level detected by the liquid level sensor. There is.

Further, in the liquid level detection unit according to one aspect of the present invention, the axis extending from one end of the second liquid level sensor to which the cable is connected along the other end on the opposite side of the cable has the length. It is inclined from the other side of the shaft side wall toward one side of the long shaft side wall.

Further, in the liquid level detection unit according to one aspect of the present invention, a guide path for guiding the other cable is formed on the other long-axis side wall portion at a position where the liquid level sensor in a floating state does not come into contact with the liquid level sensor. Has been done.

Further, in the liquid level detection unit according to one aspect of the present invention, the tubular member is provided between the liquid level sensor and the second liquid level sensor in the hanging direction, and is provided with another predetermined value. A stopper is provided on the side of the liquid level sensor to prevent the second liquid level sensor from floating with respect to the position corresponding to the liquid level.

Further, in the liquid level detection unit according to one aspect of the present invention, the above-mentioned cross section with respect to an axis extending from one end of the liquid level sensor to which the cable is connected along the other end on the opposite side of the cable. The cross-sectional shape of the liquid level sensor is circular.

According to the present invention, the float type liquid level sensor liquid level is tilted and easily lifted.

(A) is a perspective view seen from above the state in which the liquid level detection unit according to the first aspect of the present invention is attached to the grating, and (b) is a state in which the liquid level detection unit is attached to the grating. It is a perspective view seen from the bottom. It is a perspective view of the liquid level detection unit which concerns on 1st Embodiment of this invention. (A) is a perspective view of the plate unit seen from above, and (b) is a perspective view seen from below. It is a figure for demonstrating the structure of the liquid level sensor which concerns on 1st Embodiment of this invention, (a) is the perspective view of the liquid level sensor, (b) is the side view of the liquid level sensor. .. It is a side view which shows the state which the liquid level sensor is attached to the plate unit. It is a figure for demonstrating the operation of the liquid level detection unit which concerns on 1st Embodiment of this invention, (a) is a figure which shows the initial state of a liquid level sensor, (b) is a figure which shows the liquid level sensor. It is a figure which shows the state which floats on the liquid surface, and detects the warning liquid level. It is a perspective view of the liquid level detection unit which concerns on the modification which concerns on 1st Embodiment of this invention. It is a figure for demonstrating the dimension of a plate unit and a liquid level sensor. It is a perspective view of the liquid level detection unit which concerns on 2nd Embodiment of this invention. It is a side view of the liquid level detection unit which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the operation of the liquid level detection unit which concerns on 2nd Embodiment of this invention, (a) is a figure which shows the initial state of a liquid level sensor, (b) is a figure which shows the liquid level sensor. It is a figure which shows the state which floats on the liquid surface, and shows the state which the liquid level sensor tilts and detects the liquid level. (A) is a perspective view for explaining the structure of a rainwater mass to which a liquid level detection unit according to a third embodiment of the present invention is attached, and (b) is a perspective view for explaining the configuration of a rainwater mass, and (b) is a line bb in (a). It is sectional drawing in the rainwater mass along. It is a perspective view of the liquid level detection unit which concerns on 3rd Embodiment of this invention. It is a perspective view of a cover, (a) is a perspective view of a cover seen from above, and (b) is a perspective view seen from below. It is a top view of a cover. It is sectional drawing which shows the state which the liquid level sensor is attached to the cover. It is a figure for demonstrating the dimension of a cover and a liquid level sensor. It is sectional drawing which shows the state which the liquid level detection unit is attached to the grating. It is a figure for demonstrating the operation of the liquid level detection unit which concerns on 3rd Embodiment of this invention, (a) is a figure which shows the initial state of a liquid level sensor, (b) is a figure which shows the liquid level sensor. It is a state which floats on the liquid level WL and shows the state before detecting the warning liquid level K, and (c) is a figure which shows the state which the liquid level sensor tilts and detects the warning liquid level. It is a perspective view explaining the structure of the liquid level detection unit which concerns on 4th Embodiment of this invention, (a) is a perspective view, (b) is a front view. It is sectional drawing of the liquid level detection unit in the XI-XI line of FIG. 20B. It is a figure for demonstrating the operation of the liquid level detection unit which concerns on 4th Embodiment of this invention, (a) is a figure which shows the initial state of a liquid level sensor, (b) is a figure which shows the liquid level sensor. It is a figure which is the state which floated on the liquid surface, and is the figure which shows the state before the liquid level is detected, and (c) is the figure which shows the state which the liquid level sensor tilts and detects a liquid level.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
The liquid level detection unit 1A according to the first embodiment of the present invention is attached to, for example, a grating 122 of a drainage facility such as a gutter through which rainwater flows. In the liquid level detection unit 1A, when water exceeding the permissible amount enters the drainage facility and the water level (liquid level) rises, the liquid level in the rainwater mass becomes a predetermined liquid level (hereinafter, also referred to as "warning liquid level"). Detects that K1 has been reached. The liquid level detection unit 1A is applied to, for example, a known drainage facility, and the applicable drainage facility is not limited to a specific drainage facility. For example, the liquid level detection unit 1A according to the embodiment of the present invention is attached to a grid-like grating 122 provided in the drainage facility shown in FIG.

FIG. 1A is a perspective view of a state in which the liquid level detection unit 1A according to the first embodiment of the present invention is attached to the grating 122, and FIG. 1B is a perspective view showing the liquid level. It is a perspective view which looked at the state which the detection unit 1A was attached to the grating 122 from below.

The liquid level detection unit 1A according to the present embodiment attached to the grating 122 is suspended from the drainage facility via a cable 30, and is a float type liquid that detects that the liquid level WL has reached a predetermined liquid level K1. The position sensor 20 and the support portion (hereinafter, also referred to as “support plate”) 12A extending in the extending direction of the cable 30 in the drainage facility 100 and supporting the liquid level sensor 20 so as to be lifted via the cable 30. To prepare for. In the liquid level sensor 20, the extension direction of the axis x1 extending from one end 21 to which the cable 30 is connected toward the other end 22 on the opposite side of the cable 30 while being supported by the support portion 12A is the extension direction of the cable 30. Cross in the direction. Hereinafter, the configuration of the liquid level detection unit 1A will be specifically described.

[Liquid level detection unit]
FIG. 2 is a perspective view of the liquid level detection unit 1A according to the first embodiment of the present invention. The liquid level detection unit 1A is attached to the grating 122 of the drainage facility from the inside. The liquid level detection unit 1A is attached to the grating 122 via a stainless steel binder 101. The liquid level detection unit 1A includes a plate unit 10A, a liquid level sensor 20, a cable 30, and a power supply device 40.

(Plate unit)
3A and 3B are perspective views of the plate unit 10A, FIG. 3A is a perspective view of the plate unit 10A as viewed from above, and FIG. 3B is a perspective view of the plate unit 10A as viewed from below. The plate unit 10A is formed by a mounting plate 11A and a support plate 12A. The plate unit 10A is a member in which the mounting plate 11A and the support plate 12A are connected to each other so as to form an L-shape or a substantially L-shape. The mounting plate 11A and the support plate 12A are connected to each other via two metal angle members 13A.

The mounting plate 11A is a rectangular plate member in a plan view made of synthetic resin, metal, or the like. The mounting plate 11A can be supported by the grating 122 via a stainless steel binder 101. The mounting plate 11A has a plurality of insertion holes 14A. The binding tool 101 is passed through the insertion hole 14A and attached to the grating 122.

The support plate 12A is a plate member having a rectangular shape in a plan view and is made of synthetic resin, metal, or the like. The support plate 12A is mounted at right angles to the mounting plate 11A via the angle member 13A. The support plates 12A are connected to each other with one short side abutting against the short side of the mounting plate 11A. The support plate 12A extends vertically with respect to the grating 122. The support plate 12A supports the liquid level sensor 20 via the cable 30.

The support plate 12A has a pair of insertion holes 15A along the longitudinal direction. The plurality of pairs of insertion holes 15A are provided at predetermined intervals along the longitudinal direction, and serve as a fixed position for the cable 30. The liquid level sensor 20 is lifted and supported by the band-shaped fastener 31 on the support plate 12A in the cable 30.

(Liquid level sensor and cable)
4A and 4B are views for explaining the configuration of the liquid level sensor 20, FIG. 4A is a perspective view of the liquid level sensor 20, and FIG. 4B is a side view of the liquid level sensor 20. The liquid level sensor 20 is a float type sensor. The liquid level sensor 20 is suspended from the plate unit 10A by the cable 30. The liquid level sensor 20 is supported by the support plate 12A by fixing the cable 30 to the support plate 12A. As the liquid level rises, the liquid level sensor 20 tilts so that one end 21 to which the cable 30 is connected approaches the other end 22 on the opposite side of the cable 30 in the hanging direction H along the vertical direction. , Detects the warning liquid level K1.

The liquid level sensor 20 has a weight (not shown), a sphere (not shown), a microswitch (not shown), and the like inside. The liquid level sensor 20 has a function as a float and has a mass larger than the buoyancy. The liquid level sensor 20 is not particularly limited, and a known float type sensor can be used.

The cross-sectional shape of the liquid level sensor 20 along the axis x1 passing through the center of the liquid level sensor 20 is a drop shape or a substantially drop shape. The cross-sectional shape of the liquid level sensor 20 intersecting the axis x1 is circular or substantially circular. The diameter 20R in the cross-sectional shape of the liquid level sensor 20 is continuously increased from the side of the tip 21 to which the cable 30 is attached from one end 21 to the other end 22 along the axis x1.

The length 20L along the axis x1 of the liquid level sensor 20 is larger than the maximum diameter Rmax of the liquid level sensor 20. That is, the diameter 20Rmax of the liquid level sensor 20 is smaller than the length 20L of the liquid level sensor 20. The length 20L of the liquid level sensor 20 is preferably 1.30 to 1.40 times the maximum diameter Rmax.

FIG. 5 is a side view showing a state in which the liquid level sensor 20 is attached to the plate unit 10A. The cable 30 for suspending the liquid level sensor 20 is fixed to the support plate 12A. The cable 30 is attached from above the support plate 12A of the plate unit 10A in the hanging direction H. The liquid level sensor 20 is a switch in a process in which the axis x1 extending from the tip 21 to the center of the base end (the other end) 22 on the opposite side of the tip 21 in the hanging direction H approaches, for example, a horizontal state. Is turned on.

The cable 30 is electrically connected to the liquid level sensor 20. The cable 30 extends from the side of the mounting plate 11A along the support plate 12A. One end of the cable 30 is connected to the side of the tip 21 of the liquid level sensor 20. The other end of the cable 30 is connected to a power supply device 40 provided behind the support plate 12A.

The cable 30 extends along the support plate 12A. The cable 30 is attached to the support plate 12A by a band-shaped fastener 31 at a position at a predetermined distance from the liquid level sensor 20. For example, the cable 30 is fixed to the support plate 12A by inserting one end of the fastener 31 from one of the pair of insertion holes 15A of the support plate 12A and leading it out from the other insertion hole 15A.

The cable 30 has a fixed point P1 at a position fixed by the fastener 31, and is movably supported in a direction away from the support plate 12A around the fixed point P1. The cable 30 is movable in the region between the fixed point P1 and the tip 21 of the liquid level sensor 20. The position of the fixed point P1 may be set, for example, so that the liquid level sensor 20 allows the axis x1 of the liquid level sensor 20 to be in a horizontal state.

The liquid level sensor 20 is partially in contact with the support plate 12A in a state of being suspended from the support plate 12A via the cable 30. In a state where the liquid level sensor 20 is attached to the support plate 12A, the axis x1 extending from one end 21 of the liquid level sensor 20 along the other end 22 intersects in the extending direction of the cable 30. Further, the axis x1 of the liquid level sensor 20 also intersects with the support plate 12A. The liquid level sensor 20 is supported by the support plate 12A so that the axis x1 is separated from the support plate 12A with respect to the tip 21 on the side of the base end 22.

The liquid level sensor 20 floats on the liquid level WL in a direction away from the support plate 12A and tilts so that the axis x1 of the liquid level sensor 20 approaches the horizontal state, whereby the liquid level WL reaches the warning liquid level K1. Detect. That is, when the liquid level sensor 20 detects the warning liquid level K1, the liquid level sensor 20 floats on the liquid level WL, and the tip 21 of the liquid level sensor 20 approaches the base end 22 in the hanging direction H and becomes the tip 21. The distance from the base end 22 becomes shorter.

(Power supply)
The power supply device 40 is attached to the support plate 12A on the side opposite to the liquid level sensor 20. A cable 30 is electrically connected to the power supply device 40. The power supply device 40 supplies electricity to the liquid level sensor 20 via the cable 30.

[Operation of liquid level detection unit]
6A and 6B are views for explaining the operation of the liquid level detection unit 1A according to the first embodiment of the present invention, FIG. 6A is a diagram showing an initial state of the liquid level sensor 20, and FIG. 6B is a diagram. ) Is a diagram showing a state in which the liquid level sensor 20 floats on the liquid level WL and detects the warning liquid level K1. For example, heavy rainfall may cause an unexpected amount of rainwater to flow into the drainage facility through the grating 122. As a result, the liquid level WL in the drainage facility rises (see FIG. 6A).

The warning liquid level K1 of the liquid level WL detected by the liquid level sensor 20 is arbitrarily set at a position at a predetermined interval h from the grating 122 along the hanging direction H of the liquid level sensor 20. When the liquid level WL reaches the warning liquid level K1, for example, it becomes an index that water may overflow from the grating 122. For example, the liquid level sensor 20 is adapted to detect the liquid level at a predetermined height position from the base end 22. By adjusting the length of the cable 30, the hanging position of the liquid level sensor 20 is appropriately changed, and a predetermined height position from the base end 22 passing through the axis x1 is set to an arbitrarily set warning liquid level K1. It can be made to correspond.

As the amount of rainfall flowing in through the grating 122 increases, the liquid level WL reaches the base end 22 of the liquid level sensor 20, and the liquid level sensor 20 emerges. The liquid level sensor 20 floats away from the support plate 12A while tilting together with the cable 30.

The liquid level sensor 20 has a mass larger than the buoyancy. In the liquid level sensor 20, the center point of buoyancy is on the side of the base end 22, and the center of gravity of the liquid level sensor 20 is located on the side of the tip end 21. Therefore, a rotational moment is generated in the liquid level sensor 20 due to the deviation between the center point of the buoyancy and the center of gravity. In the liquid level sensor 20, the tip 21 of the liquid level sensor 20 is tilted as the liquid level WL rises due to the generation of the rotational moment, and the tip 21 of the liquid level sensor 20 is on the side of the base end 22 in the hanging direction H. The axis x1 approaches horizontal or substantially horizontal (see FIG. 6B).

When the liquid level WL reaches the warning liquid level K1 and, for example, the axis x1 of the liquid level sensor 20 exceeds a predetermined angle with the support plate 12A, the internal sphere rolls and the micro switch is turned on. The liquid level sensor 20 transmits a signal warning that the liquid level WL in the drainage facility has reached the warning liquid level K1 to an external device.

By attaching the liquid level detection unit 1A as described above to the drainage facility, the possibility of flood damage can be recognized in advance. According to the liquid level detection unit 1A, the liquid level sensor 20 is attached to the support plate 12A together with the cable 30 in a state where the axis x1 is tilted with respect to the extending direction of the cable 30. Therefore, when the liquid level WL rises to the proximal end 22, the liquid level sensor 20 floats away from the support plate 12A together with the cable 30 below the fixed point P1 instead of in the vertical direction. As a result, the liquid level sensor 20 is susceptible to buoyancy, and the liquid level sensor 20 is smoothly lifted.

Further, since the support plate 12A is provided with a plurality of pairs of insertion holes 15A at predetermined intervals along the longitudinal direction, the position of the fixing point P1 of the cable 30 with respect to the support plate 12A should be appropriately selected. Can be done. For example, if the distance between the tip 21 of the liquid level sensor 20 and the fixed point P1 is large, the curvature of the cable 30 when the liquid level sensor 20 is lifted becomes large, and the load on the cable 30 can be reduced.

Further, for example, if the distance between the tip 21 of the liquid level sensor 20 and the fixed point P1 is reduced, the curvature of the cable 30 when the liquid level sensor 20 is lifted becomes smaller, and the space required for the lift of the liquid level sensor 20 is reduced. It can be suppressed to a small size. This increases the degree of freedom in mounting symmetry of the liquid level detection unit 1A.

By connecting the mounting plate 11A to the support plate 12A, foreign matter flowing from the grating 122 is prevented from directly adhering to the liquid level sensor 20, and the liquid level sensor 20 is intended by the inflowing water. It is possible to reliably avoid erroneously detecting that the liquid level sensor 20 has reached the warning liquid level K1 by being shaken without being shaken.

<Others>
For example, the plate unit 10A is attached to the grating 122 via the attachment plate 11A, but the attachment plate 11A may not be provided. In this case, the support plate 12A can be attached to the grating 122 via the metal angle member 13A.

Further, for example, the support plate 12A may have a pair of projecting plates 16A. FIG. 7 is a perspective view of the liquid level detection unit 1B according to the modified example. The pair of projecting plates 16A project to the side where the liquid level sensor 20 is supported along each edge (long side) extending in the longitudinal direction. The projecting plate 16A is provided so as to face each other on the side of each long side. The protruding plates 16A are separated from each other in the lateral direction so as to allow only the floating of the liquid level sensor 20 in the direction away from the support plate 12A. The projecting plate 16A is mounted on the side opposite to the mounting plate 11A on the short side. The liquid level sensor 20 is located between the pair of protruding plates 16A.

The liquid level sensor 20 floats on the liquid level WL in a direction away from the support plate 12A between the pair of protruding plates 16A, and the axis x1 of the liquid level sensor 20 is tilted so as to approach the horizontal state, so that the liquid level WL is warned. It is detected that the liquid level K1 has been reached. That is, when the liquid level sensor 20 detects the warning liquid level K1, the liquid level sensor 20 floats on the liquid level WL, and the tip 21 of the liquid level sensor 20 approaches the base end 22 in the hanging direction H, and the tip 21 and the base end 21 are used. The distance to the end 22 becomes shorter. In the liquid level detection unit 1B, the warning liquid level K1 may be set between the pair of projecting plates 16A in the hanging direction H.

(Relationship between plate unit and liquid level sensor)
FIG. 8 is a diagram for explaining the dimensions of the plate unit 10B and the liquid level sensor 20. The distance d1 between the pair of protruding plates 16A is smaller than the length 20L of the liquid level sensor 20 (d1 <20L). The interval d1 is slightly larger than the maximum diameter 20Rmax of the liquid level sensor 20 (d1> 20Rmax). For example, the interval d1 is preferably 1.10 to 1.30 times the maximum diameter of 20Rmax. The distance d1 between the pair of projecting plates 16A is only slightly larger than the maximum diameter 20Rmax of the liquid level sensor 20.

According to the liquid level detection unit 1B as described above, at least the same effect as that of the liquid level detection unit 1A is obtained. Further, the direction in which the liquid level sensor 20 floats between the pair of projecting plates 16A can be uniquely restricted. This makes it possible to increase the degree of freedom in mounting the liquid level detection unit 1B.

Since the liquid level sensor 20 has a circular cross-sectional shape, even when the liquid level sensor 20 comes into contact with the projecting plate 16A, the contact is a point contact and is in a direction away from the support plate 12A. It is possible to prevent the movement of the sensor from being hindered.

<Second embodiment>
The liquid level detection unit 1C according to the second embodiment will be described below. FIG. 9 is a perspective view of the liquid level detection unit 1C according to the second embodiment. The power supply device 40 is not shown. Hereinafter, the parts different from the liquid level detection unit 1A will be mainly described, and the same parts as the liquid level detection unit 1A will be designated by the same reference numerals and the description thereof will be omitted.

The liquid level detection unit 1C includes a plate unit 10C, an extension support plate (extension support portion) 13C, a liquid level sensor 20, a liquid level sensor (second liquid level sensor) 50, a cable 30, and a cable (separate). A cable) 60 and a power supply device 40 are provided.

The extension support plate 13C is a plate member having a rectangular front view, which is made of synthetic resin, metal, or the like. The extension support plate 13C is attached to the support plate 12A via two metal plates 14C. The extension support plate 13C is connected to each other in a state where one short side is abutted against the short side of the support plate 12A on the side opposite to the mounting plate 11A (lower side in the hanging direction H). The extension support plate 13C extends vertically with respect to the grating 122. The support plate 12A supports the liquid level sensor 20 via the cable 30. The extension support plate 13C has a pair of insertion holes (not shown) along the longitudinal direction. The plurality of pairs of insertion holes are provided at predetermined intervals along the longitudinal direction, and serve as fixed positions for the cable 60. The liquid level sensor 50 is supported by a band-shaped fastener 61 on the cable 60 so as to be able to float on the extension support plate 13C.

The liquid level sensor 50 is a float type sensor. The liquid level sensor 50 is suspended from the extension support plate 13C by a cable 60. The liquid level sensor 50 is supported by the extension support plate 13C by fixing the cable 60 to the extension support plate 13C. As the liquid level rises, the liquid level sensor 50 tilts so that one end 51 to which the cable 60 is connected approaches the other end 52 on the opposite side of the cable 60 in the hanging direction H, so that the liquid level is warned. It is detected that the liquid level K2 below the liquid level K1 has been reached. The liquid level sensor 50 has the same configuration as the liquid level sensor 20.

FIG. 10 is a side view of the liquid level detection unit 1C. The cable 60 for suspending the liquid level sensor 50 is fixed to the extension support plate 13C. The cable 60 is electrically connected to the liquid level sensor 50. The cable 60 extends from the side of the support plate 12A along the extension support plate 13C. One end of the cable 60 is connected to the side of the tip 51 of the liquid level sensor 50. The other end of the cable 60 is connected to a power supply device 40 provided behind the support plate 12A.

The cable 60 is attached from above in the hanging direction H along the longitudinal direction of the support plate 12A in a state of being suspended along the extension support plate 13C. The liquid level sensor 50 is switched on when the axis x2 extending from the tip 51 to the center of the base end (the other end) 52 on the opposite side of the tip 51 in the hanging direction H approaches a horizontal state, for example. become.

The cable 60 extends along the extension support plate 13C. The cable 60 is attached to the extension support plate 13C by a band-shaped fastener 61 at a position at a predetermined distance from the liquid level sensor 50. For example, the cable 60 is fixed to the extension support plate 13C by inserting one end of the fastener 61 from one of the pair of insertion holes of the extension support plate 13C and leading it out from the other insertion hole.

The cable 60 has a fixed point P2 at a position fixed by the fastener 61, and is movably supported in a direction away from the extension support plate 13C around the fixed point P2. The cable 60 is movable in the region between the fixed point P2 and the tip 51 of the liquid level sensor 50. The position of the fixed point P2 may be set, for example, so that the liquid level sensor 50 allows the axis x2 to be in a horizontal state.

The liquid level sensor 50 is partially in contact with the extension support plate 13C in a state of being suspended from the extension support plate 13C via the cable 60. In a state where the liquid level sensor 50 is attached to the extension support plate 13C, the axis x2 extending from one end 51 to the other end 52 of the liquid level sensor 50 intersects the extending direction of the cable 60. Further, the axis x2 of the liquid level sensor 50 also intersects with the extension support plate 13C. The liquid level sensor 50 is supported by the extension support plate 13C so that the axis x2 is separated from the extension support plate 13C with respect to the tip 51 on the side of the base end 52.

[Operation of liquid level detection unit]
11A and 11B are views for explaining the operation of the liquid level detection unit 1C, FIG. 11A is a diagram showing an initial state of the liquid level sensor 50, and FIG. 11B is a diagram in which the liquid level sensor 50 is on the liquid level WL. It is a floating state, and is the figure which shows the state which the liquid level sensor 50 tilts and detects the liquid level K2. The liquid level K2 of the liquid level detected by the liquid level sensor 50 is arbitrarily set at a position at a predetermined interval along the hanging direction H of the liquid level sensors 20 and 50 from the grating 122 of the drainage facility. The liquid level K2 is set at a position lower than the warning liquid level K1. The liquid level K2 on the liquid level detected by the liquid level sensor 50 is arbitrarily set at a position at a predetermined interval from the grating 122 along the hanging direction H of the liquid level sensor 50. The liquid level K2 is set at a position lower than the warning liquid level K1.

When the liquid level WL reaches the base end of the liquid level sensor 50 as the amount of rainfall flowing in through the grating 122 increases, the liquid level sensor 50 emerges. The liquid level sensor 50 rises away from the extension support plate 13C while tilting together with the cable 60. In the liquid level sensor 50, the tip 51 of the liquid level sensor 50 is tilted as the liquid level WL rises, and the tip 51 of the liquid level sensor 50 approaches the side of the base end 52 in the hanging direction H, and the axis x2 is drawn. Approaches horizontal or nearly horizontal.

When the liquid level WL reaches the liquid level K2 and the liquid level sensor 50 rises while tilting, for example, when the axis x2 of the liquid level sensor 50 exceeds a predetermined angle with respect to the extension support plate 13C, the internal sphere rolls and micro. The switch turns on. The liquid level sensor 50 transmits a signal to the external device informing that the liquid level WL in the drainage facility is approaching the warning liquid level K1 (that the predetermined liquid level K2 has been reached). When the liquid level WL further rises and reaches the warning liquid level K1, the liquid level sensor 20 operates. The operation of the liquid level sensor 20 is the same as that of the first embodiment.

According to the liquid level detection unit 1C as described above, at least the same effect as that of the liquid level detection unit 1A is obtained. Further, the liquid level sensor 50 can detect the liquid levels K1 and K2 at two different height positions in the drainage facility in the hanging direction H of the liquid level detection unit 1C. For example, it is possible to detect that the liquid level WL has risen at the stage when the liquid level WL reaches the liquid level K2 lower than the warning liquid level K1 before reaching the warning liquid level K1 in the drainage facility. As a result, it is possible to recognize at an early stage that there is an increased risk of water overflowing from the drainage facility before the liquid level WL reaches the warning liquid level K1.

Further, the liquid level detection unit 1C may have two pairs of protruding plates 16A. The pair of projecting plates 16A are provided on the support plate 12A and the extension support plate 13C, respectively.

<Third embodiment>
Hereinafter, the liquid level detection unit 1D according to the third embodiment of the present invention will be described. FIG. 12 (a) is a perspective view for explaining the configuration of the rainwater mass 100 to which the liquid level detection unit 1D according to the third embodiment is attached, and FIG. 12 (b) is a perspective view showing bb in (a). It is a cross-sectional view along a line. Hereinafter, the parts different from the liquid level detection unit 1A will be mainly described, and the same parts as the liquid level detection unit 1A will be designated by the same reference numerals and the description thereof will be omitted.

The liquid level detection unit 1D according to the third embodiment is attached to, for example, a drainage facility (hereinafter, also referred to as “rainwater mass”) 100 for flowing rainwater through a sewer pipe. In the liquid level detection unit 1D, when water exceeding the permissible amount overflows from the sewer pipe and rises in the rainwater mass, the liquid level in the rainwater mass becomes a predetermined liquid level (hereinafter, also referred to as "warning liquid level"). ) Detects that K1 has been reached. The liquid level detection unit 1D is applied to, for example, a known drainage facility, and the applicable drainage facility is not limited to a specific drainage facility. For example, the liquid level detection unit 1D according to the embodiment of the present invention is applied to the rainwater mass 100 shown in FIG.

The rainwater mass 100 collects rainwater on the premises of a building such as a house. The rainwater mass 100 is made of, for example, concrete. The rainwater mass 100 flows the water buried in the ground and flowing into the sewer pipe, for example.

The rainwater mass 100 has a main body portion 110 and an inflow portion 120. The main body 110 and the inflow 120 are integrally formed with each other. The main body 110 is buried in the ground. The main body 110 is formed in a cylindrical shape. The main body 110 has a piping port 111. For example, a sewer pipe is connected to the pipe port 111, and the water flowing into the rainwater mass 100 is discharged to the sewer pipe.

The inflow portion 120 is provided at one end of the main body 110 in the axial direction. In the state where the rainwater mass 100 is installed in the ground, the inflow portion 120 is exposed on the ground. The inflow portion 120 has an inflow opening 121. For example, rainwater or the like flows into the main body 110 through the inflow opening 121. The inflow opening 121 is closed by a grid-like lid such as a grating 122.

The above rainwater mass 100 is provided with a liquid level detection unit 1D that detects and measures the liquid level in the rainwater mass 100. The liquid level detection unit 1D according to the third embodiment has a tubular shape with one end closed and the other end open, and has a short axis Sa and a long axis La in a cross section orthogonal to the extending direction. A tubular member having a pair of short-axis side wall portions 12D and 13D facing each other in the direction of the short-axis Sa and a pair of long-axis side wall portions 14D and 15D facing each other in the direction of the long-axis La (hereinafter, "" (Also referred to as "cover") 10D and the tubular member 10D are suspended from one end to the other end via a cable 30 and housed in the tubular member 10D, and the liquid level reaches a predetermined liquid level. A float type liquid level sensor 20 for detecting this is provided. The cable 30 for suspending the liquid level sensor 20 is attached to one of the pair of long axis side wall portions 14D and 15D, and one end of the liquid level sensor 20 to which the cable 30 is connected is the other end on the opposite side of the cable 30. The axis x1 extending along the axis is inclined from one of the long axis side wall portions 14D and 15D toward the other side of the long axis side wall portions 14D and 15D. Hereinafter, the configuration of the liquid level detection unit 1D will be specifically described.

[Liquid level detection unit]
FIG. 13 is a perspective perspective view of the liquid level detection unit 1D according to the third embodiment of the present invention. The liquid level detection unit 1D is attached to the grating 122 of the rainwater mass 100 from the side of the main body 110. The liquid level detection unit 1D is attached to the grating 122 of the rainwater mass 100 via a stainless steel binding tool 101. The liquid level detection unit 1D includes a cover 10D, a liquid level sensor 20, a cable 30, and a power supply device 40.

(cover)
14A and 14B are perspective views of the cover 10D, FIG. 14A is a perspective view of the cover 10D as viewed from above, and FIG. 14B is a perspective view of the cover 10D as viewed from below. The cover 10D is a cylindrical member having one end closed and the other end open. The cover 10D is, for example, an integrally molded member formed of a synthetic resin. The cover 10D is a tubular member having an elliptical or substantially elliptical cross-sectional shape intersecting in the extending direction.

FIG. 15 is a plan view of the cover 10D. The cover 10D has a short axis Sa and a long axis La relatively long with respect to the short axis Sa in the cross-sectional shape. The cover 10D has an upper end wall portion 11D, a pair of short-axis side wall portions 12D and 13D, and a pair of long-axis side wall portions 14D and 15D. The cover 10D defines an accommodation space S for accommodating the liquid level sensor 20 by the upper end wall portion 11D, the short-axis side wall portions 12D and 13D, and the long-axis side wall portions 14D and 15D. The pair of short axis side wall portions 12D and 13D face each other in the direction of the short axis Sa and extend along the direction of the long axis La. The major axis side wall portions 14D and 15D face the direction of the major axis La and extend along the direction of the minor axis Sa.

The upper end wall portion 11D closes one end of the cover 10D. The liquid level detection unit 1D is attached to the grating 122 at the upper end wall portion 11D. The cover 10D has a short rib (first rib) 11Da protruding to the side opposite to the other end along the short axis side wall portions 12D and 13D and a long axis side wall portion 14D and 15D in the upper end wall portion 11D. It has a longitudinal rib (second rib) 11Db that protrudes to the side opposite to the other end. The first rib 11Da and the second rib 11Db can support the binding tool 101 that binds the cover 10D to the drainage facility 100.

The short rib 11Da and the long rib 11Db are portions formed in a thin plate shape. The number of short ribs 11Da and long ribs 11Db is not particularly limited. Each short rib 11Da extends along the short axis Sa. The short ribs 11Da are provided at equal intervals in the direction of the long axis La, respectively. The short rib 11Da projects from the upper end wall portion 11D to the side opposite to the accommodation space S.

The longitudinal rib 11Db extends along the direction of the major axis La so as to intersect the lateral rib 11Da. The longitudinal rib 11Db extends between the short ribs 11Da provided at both ends in the direction of the major axis La. The longitudinal ribs 11Db are provided at equal intervals between one end and the other end of the short rib 11Da in the direction of the short axis Sa, respectively.

The height of the short rib 11Da and the long rib 11Db is higher than the thickness of the cable 30 attached to the upper end wall portion 11D. As a result, when the liquid level detection unit 1D is attached to the grating 122, it is possible to prevent the cable 30 from coming into contact with the grating 122.

The short rib 11Da and the longitudinal rib 11Db each have a support opening (not shown) for supporting the stainless steel binder 101. The support opening in each short rib 11Da is formed so as to penetrate in the thickness direction of the short rib 11Da. The support opening in the short rib 11Da is provided between the intersection position of the short rib 11Da and the longitudinal rib 11Db.

The support opening in each longitudinal rib 11Db is formed so as to penetrate in the thickness direction of the longitudinal rib 11Db. The support opening is provided between the intersection position of the short rib 11Da and the longitudinal rib 11Db.

Select a support opening at an appropriate position and attach the bundling tool 101 according to the grid pattern of the grating 122 to which the liquid level detection unit 1D is attached, or according to the position of the grating 122 to which the liquid level detection unit 1D is attached. Be done. The number of short ribs 11Da, long ribs 11Db, and support openings is not particularly limited.

A guide portion 11Dc for guiding the cable 30 for suspending the liquid level sensor 20 is formed on the upper end wall portion 11D. The guide portion 11Dc is provided on the side of the long axis side wall portion 14D in the direction of the long axis La. The guide portion 11Dc guides the cable 30 from the outside of the cover 10D into the accommodation space S. The cable 30 is attached to the guide portion 11Dc.

The pair of short-axis side wall portions 12D and 13D extend linearly along the long-axis La. The short axis side wall portions 12D and 13D are provided with a predetermined distance d2 from each other in the direction of the short axis Sa, respectively. The distance d2 between the side wall portions 12D and 13D of each short axis is set to such an extent that the floating of the liquid level sensor 20 in the direction of the short axis Sa is not allowed.

At least one hole 16D is formed in the cover 10D. The short axis side wall portions 12D and 13D each have a plurality of holes 16D. In the extending direction of the cover 10D, the hole 16D is provided on the upper end wall portion 11D side with respect to the liquid level sensor 20 in a state where the liquid level sensor 20 is suspended. Water and air in the cover 10D are discharged to the outside of the cover 10D through the holes 16D.

The pair of long axis side wall portions 14D and 15D extend between the ends of the pair of short axis side wall portions 12D and 13D in the direction of the long axis La. The major axis side wall portions 14D and 15D extend outward in a convex arc shape from the accommodation space S in a plan view.

The pair of long axis side wall portions 14D and 15D are provided with a predetermined distance d3 from each other in the direction of the long axis La. The distance d3 between the side wall portions 14D and 15D of each long axis can at least detect that the liquid level sensor 20 floats in the direction of the long axis La in response to the rise of the liquid level and the liquid level reaches the warning liquid level K1. It is set to the extent that it allows it to tilt to a certain degree.

(Liquid level sensor and cable)
The liquid level sensor 20 is a float type sensor. The liquid level sensor 20 is housed in a state of being suspended in the cover 10D by the cable 30. The liquid level sensor 20 floats on the liquid surface in the cover 10D and rises along the long axis side wall portions 14D and 15D of the cover 10D as the liquid level in the cover 10D rises, and the cable 30 floats in the hanging direction H. The warning liquid level K1 is detected by the connected one end 21 approaching the other end 22 on the opposite side of the cable 30.

The cable 30 is attached to one end (tip) 21 of the liquid level sensor 20 on the upper end wall portion 11D side in the hanging direction H along the longitudinal direction of the cover 10D in a state of being suspended in the cover 10D. The liquid level sensor 20 is a switch in a process in which the axis x1 extending from the tip 21 to the center of the base end (the other end) 22 on the opposite side of the tip 21 in the hanging direction H approaches, for example, a horizontal state. Is turned on.

When the liquid level sensor 20 is housed in the cover 10D, its base end 22 is located closer to the upper end wall portion 11D than the other end of the cover 10D on the side opposite to the upper end wall portion 11D. That is, the entire liquid level sensor 20 is located in the accommodation space S.

FIG. 16 is a cross-sectional view showing a state in which the liquid level sensor 20 is attached to the cover 10D. The cable 30 for suspending the liquid level sensor 20 is attached to one of the long-axis side wall portions 14D and 15D of the pair of long-axis side wall portions 14D.

The cable 30 is electrically connected to the liquid level sensor 20. The cable 30 extends from the outside to the inside of the cover 10D through the guide portion 11Dc of the upper end wall portion 11D. One end of the cable 30 is connected to the side of the tip 21 of the liquid level sensor 20. The other end of the cable 30 is connected to a power supply device 40 provided outside the cover 10D.

The cable 30 extends along one of the major axis side wall portions 14D. The cable 30 is attached to one of the long axis side wall portions 14D by a band-shaped fastener 31 at a position at a predetermined distance from the liquid level sensor 20. For example, two insertion holes (not shown) are formed in the long-axis side wall portion 14D, and one end of the fastener 31 is inserted into the cover 10D from one of the insertion holes to insert the long-axis side wall portion 15D of the cable 30. The cable 30 is fixed to the cover 10D by leading through the side and again from the other insertion hole to the outside of the cover 10D.

The cable 30 has a fixed point P1 at a position fixed by the fastener 31, and is movably supported from the fixed point P1 toward the long axis side wall portion 15D. The cable 30 is movable along the long axis La in the region between the fixed point P1 and the tip 21 of the liquid level sensor 20. The position of the fixed point P1 may be set, for example, so that the liquid level sensor 20 allows the axis x1 of the liquid level sensor 20 to be in a horizontal state.

A part of the outer peripheral surface of the liquid level sensor 20 is in contact with the long axis side wall portion 14D in a state of being suspended from the cover 10D via the cable 30. With the liquid level sensor 20 attached to the cover 10D, the axis x1 extending from one end 21 of the liquid level sensor 20 along the other end 22 faces from the long axis side wall portion 14D to the side of the long axis side wall portion 15D. Is tilted. The axis x1 of the liquid level sensor 20 is separated from the long-axis side wall portion 14D with respect to the tip 21 on the side of the base end 22 and is close to the long-axis side wall portion 15D.

(Relationship between cover and liquid level sensor)
FIG. 17 is a diagram for explaining the dimensions of the cover 10D and the liquid level sensor 20. The distance d2 between the pair of short axis side wall portions 12D and 13D is smaller than the length 20L of the liquid level sensor 20 (d2 <20L). The interval d2 is slightly larger than the maximum diameter 20Rmax of the liquid level sensor 20 (d2> 20Rmax). For example, the interval d2 is preferably 1.10 to 1.30 times the maximum diameter of 20Rmax. The interval d2 may be set so as to prevent the liquid level sensor 20 from rising along the direction of the short axis Sa.

The distance d3 between the pair of long axis side wall portions 14D and 15D is larger than the length 20L of the liquid level sensor 20 (d3> 20L). The interval d3 is the sum of at least the length 20L of the liquid level sensor 20 and the interval 30L from the fixed point P1 of the cable 30 to the tip 21 of the liquid level sensor 20 when the liquid level sensor 20 is floating and tilted horizontally. It is a dimension larger than the dimension (d3> 20L + 30L). The interval d3 may be set so as not to prevent the liquid level sensor 20 from floating along the direction of the long axis La and detecting the warning liquid level K1 at least in the process of the axis x1 approaching the horizontal state. ..

(Power supply)
The power supply device 40 is attached to the grating 122. A cable 30 is electrically connected to the power supply device 40. The power supply device 40 supplies electricity to the liquid level sensor 20 via the cable 30. The power supply device 40 has a plurality of hooks 41. The power supply device 40 is attached to the grating 122 by passing the binding tool 101 through the hook 41.

[Operation of liquid level detection unit]
FIG. 18 is a cross-sectional view showing a state in which the liquid level detection unit 1D is attached to the grating 122. The liquid level sensor 20 floats on the liquid level WL along the short axis side wall portions 12D and 13D in the direction of the long axis La, and the liquid level WL is tilted so that the axis x1 of the liquid level sensor 20 approaches the horizontal state. Detects that the warning liquid level K1 has been reached. That is, when the liquid level sensor 20 detects the warning liquid level K1, the liquid level sensor 20 floats on the liquid level WL, and the tip 21 of the liquid level sensor 20 approaches the base end 22 in the hanging direction H, and becomes the tip 21. The distance from the base end 22 becomes shorter.

The warning liquid level K1 of the liquid level WL detected by the liquid level sensor 20 is arbitrarily set at a position at a predetermined interval h from the grating 122 of the rainwater mass 100 along the hanging direction H of the liquid level sensor 20. .. When the liquid level WL reaches the warning liquid level K1, for example, it becomes an index that water may overflow from the rainwater mass 100. For example, the liquid level sensor 20 is adapted to detect the liquid level at a predetermined height position from the base end 22. The length of the cable 30 in the cover 10D can be adjusted, and the hanging position of the liquid level sensor 20 can be appropriately changed to correspond to an arbitrarily set warning liquid level K1.

19A and 19B are views for explaining the operation of the liquid level detection unit 1D, FIG. 19A is a diagram showing an initial state of the liquid level sensor 20, and FIG. 19B is a diagram in which the liquid level sensor 20 is on the liquid level WL. It is a floating and tilted state, and is a diagram showing a state before detecting the warning liquid level K1. In (c), the liquid level WL further rises and the liquid level sensor 20 tilts to detect the warning liquid level K1. It is a figure which shows the state. For example, heavy rainfall may cause an unexpected amount of rainfall to flow into the rainwater mass 100 through the grating 122 so that it can flow into the sewer pipe. The water overflowing from the pipe port 111 returns to the rainwater mass 100. As a result, the liquid level WL in the main body 110 of the rainwater mass 100 rises (see FIG. 19A).

As the liquid level of the amount of rainfall flowing into the rainwater mass 100 rises, water also enters the inside of the cover 10D from the side opposite to the upper end wall portion 11D. When the liquid level WL reaches the base end 22 of the liquid level sensor 20, the liquid level sensor 20 emerges.

The distance d2 between the short axis side wall portions 12D and 13D in the cover 10D is only slightly larger than the maximum diameter 20Rmax of the liquid level sensor 20. The liquid level sensor 20 is not in the direction of the short axis Sa and the vertical direction (suspension direction H), but is tilted along with the cable 30 along the short axis side wall portions 12D and 13D and along the long axis La. It rises toward the side wall portion 15D (see FIG. 19B).

The liquid level sensor 20 has a mass larger than the buoyancy. In the liquid level sensor 20, the center point of buoyancy is on the side of the base end 22, and the center of gravity of the liquid level sensor 20 is located on the side of the tip end 21. Therefore, a rotational moment is generated in the liquid level sensor 20 due to the deviation between the center point of the buoyancy and the center of gravity. In the liquid level sensor 20, the tip 21 of the liquid level sensor 20 is tilted as the liquid level WL rises due to the generation of the rotational moment, and the tip 21 of the liquid level sensor 20 is on the side of the base end 22 in the hanging direction H. The axis x1 approaches horizontal or substantially horizontal (see FIG. 19 (c)).

When the liquid level WL reaches the warning liquid level K1 and, for example, the axis x1 of the liquid level sensor 20 exceeds a predetermined angle with the long axis side wall portion 14D, the internal sphere rolls and the micro switch is turned on. .. The liquid level sensor 20 transmits a signal warning that the liquid level WL in the rainwater mass 100 has reached the warning liquid level K1 to an external device.

By attaching the liquid level detection unit 1D as described above to the drainage facility 100, it is possible to recognize the occurrence of flood damage in advance. According to the liquid level detection unit 1D, since the liquid level sensor 20 is housed in the cover 10D, foreign matter flowing from the grating 122 is prevented from adhering to the liquid level sensor 20, and the inflowing water causes the foreign matter to be prevented from adhering to the liquid level sensor 20. It is possible to reliably prevent the liquid level sensor 20 from being unintentionally shaken and erroneously detecting that the liquid level sensor 20 has reached the warning liquid level K1. With the cover 10D, the liquid level sensor 20 can detect the warning liquid level K1 based only on the liquid level WL rising in the cover 10D.

The cover 10D sets the distance d2 between the short axis side wall portions 12D and 13D so as to allow only the floating of the liquid level sensor 20 along the direction of the long axis La. That is, the cover 10D limits the floating direction of the liquid level sensor 20 only to the direction along the long axis La. In the cover 10D, it is not necessary to provide a space that allows the liquid level sensor 20 to float in the direction along the short axis Sa, and the cover 10D can be miniaturized in the direction of the short axis Sa. As a result, the cost of parts and the cost of manufacturing the cover 10D can be suppressed. Further, due to the miniaturization of the cover 10D, the degree of freedom for the place where the liquid level detection unit 1D is installed is increased.

Since the liquid level sensor 20 is attached to one long axis side wall portion 14D, the direction in which the liquid level sensor 20 floats can be limited to only one direction (the direction toward the other long axis side wall portion 15D). As a result, for example, the cover 10D has a cover 10D as compared with a configuration in which the liquid level sensor 20 is installed at an intermediate position at the interval d3 of the pair of long axis side wall portions 14D and 15D so that the liquid level sensor 20 can be lifted in both directions. It is excellent in terms of miniaturization.

Since the liquid level sensor 20 is suspended in a state where the base end 22 is tilted toward the long axis side wall portion 15D, the liquid level sensor 20 can be easily lifted along the direction of the long axis La.

Since the liquid level sensor 20 has a circular cross-sectional shape, even when the liquid level sensor 20 comes into contact with the short axis side wall portions 12D and 13D, the contact is a point contact and the long axis La It is possible to prevent the movement in the direction of the above from being hindered.

Since the holes 16D are provided in the short shaft side wall portions 12D and 13D, the air that has entered the cover 10D can be discharged to the outside of the cover 10D, so that the air collects in the cover 10D and unintentionally enters the cover 10D. It is possible to prevent the liquid level from dropping.

Further, on the upper end wall portion 11D of the cover 10D, a plurality of ribs 11Da and 11Db extend in a grid pattern along the direction of the short axis Sa and the direction of the long axis La. Therefore, the degree of freedom in the position and orientation in which the liquid level detection unit 1D is attached via the binding tool 101 is increased corresponding to the target to which the liquid level detection unit 1D is attached, for example, the lattice shape of the grating 122.

<Others>
For example, in the liquid level detection unit 1D of the above embodiment, the liquid level sensor 20 is provided on the side of one of the long axis side wall portions 14D. On the other hand, the cable 30 may be fixed to the intermediate position in the direction of the long axis La by the fastener 31 at any of the short axis side wall portions 12D and 13D. In this case, the cover 10D is designed to have an interval d3 that allows the liquid level sensor 20 to float in both directions in the direction of the major axis La.

Further, although the cross-sectional shape intersecting the extending direction of the cover 10D is an elliptical shape or a substantially elliptical shape, the cover 10D may be a rectangular shape or a substantially rectangular shape. Further, the cover 10D may be formed of a metal net cage or the like as long as the cross-sectional shapes intersecting in the extending direction are the same.

<Fourth Embodiment>
The liquid level detection unit 1E according to the fourth embodiment will be described below. 20A and 20B are views for explaining the configuration of the liquid level detection unit 1E according to the fourth embodiment, FIG. 20A is a perspective view, and FIG. 20B is a front view. The power supply device 40 is not shown. Hereinafter, the parts different from the liquid level detection unit 1D will be mainly described, and the same parts as the liquid level detection unit 1D will be designated by the same reference numerals and the description thereof will be omitted.

The liquid level detection unit 1E according to the fourth embodiment is applied to, for example, a rainwater mass 100 similar to the liquid level detection unit 1D. The liquid level detection unit 1E is suspended below the liquid level sensor 20 from one end to the other end of the cover 10E via a cable 60 different from the cable 30, and is housed in the cover 10E. A float type second liquid level sensor 50 that detects that another predetermined liquid level K2 has been reached below the warning liquid level K1 detected by the position sensor 20 is further provided.

The liquid level detection unit 1E includes a cover 10E, liquid level sensors 20, 50, cables 30, 60, and a power supply device (not shown). The cover 10E has the same configuration as the cover 10D according to the third embodiment.

A guide portion 11Ed for guiding the cable 60 for suspending the liquid level sensor 50 is formed on the upper end wall portion 11D. The guide portion 11Ed is provided on the side opposite to the long axis side wall portion 14D in the direction of the long axis La and on the side of the long axis side wall portion 15D. The guide portion 11Ed guides the cable 60 from the outside of the cover 10E into the accommodation space S. The cable 60 is attached to the guide portion 11Ed.

A guide path 17E for guiding the cable 60 is formed on the long-axis side wall portion 15D at a position where it does not come into contact with the floating liquid level sensor 20. The long axis side wall portion 15D has a guide path 17E extending along the extending direction of the cover 10E. The guide path 17E extends over a range facing the liquid level sensor 20. A cable 60 guided into the cover 10E is passed through the guide path 17E through the guide portion 11Ed of the upper end wall portion 11D.

21 (a) is a cross-sectional view taken along the line XXI (a) -XXI (a) of FIG. 20 (b), showing a state in which the liquid level sensor 20 is lifted, and FIG. 21 (b) is FIG. 20 (b). It is sectional drawing in the XXI (b) -XXI (b) line of b), and shows the state which the liquid level sensor 50 floated. The guide path 17E is formed in the central portion of the long axis side wall portion 15D in the direction of the short axis Sa. The guide path 17E is a portion where the distance between the covers 10E is narrowed in the direction of the short axis Sa. The distance d4 from the long axis side wall portion 14D to the guide path 17E is set to be at least larger than the total distance (20L + 30L) of the length 20L of the liquid level sensor 20 and the distance 30L of the cable 30 (d4> 20L + 30L). ).

The cover 10E is provided with a stopper 18E. The stopper 18E is provided between the liquid level sensor 20 and the liquid level sensor 50 in the hanging direction H. The stopper 18E prevents the liquid level sensor 50 from floating toward the liquid level sensor 20 with respect to the position corresponding to the liquid level K2.

The stopper 18E is a member formed separately from the cover 10E, and is attached to at least one of the short-axis side wall portions 12D and 13D and the long-axis side wall portions 14D and 15D. In the stopper 18E, the liquid level sensor 50 located below the liquid level sensor 20 floats toward the liquid level sensor 20 as the liquid level rises, and moves along the long axis La of the liquid level sensor 20. It is intended not to interfere with.

The stopper 18E is provided between the liquid level sensor 20 and the second liquid level sensor 50 in the hanging direction H. Specifically, the stopper 18E is above the liquid level K2 to be detected by the second liquid level sensor 50 in the hanging direction H, and below the lower end of the movable range of the liquid level sensor 20. It is provided on the cover 10E. Further, the stopper 18E is provided on the side (upper side) of the liquid level sensor 20 with respect to the fixing point P2 in which the cable 60 is fixed to the long axis side wall portion 15D by the fastener 61.

The configuration of the liquid level sensor 50 is the same as that of the liquid level sensor 20. The configuration of the cable 60 is the same as that of the cable 30. The liquid level sensor 50 is housed in a state of being suspended in the cover 10E by the cable 60. The liquid level sensor 50 is located below the liquid level sensor 20 in the hanging direction H. In the liquid level sensor 50, as the liquid level in the cover 10E floats on the liquid surface in the cover 10E and the liquid level in the cover 10E rises, one end 51 to which the cable 60 is connected in the hanging direction H is connected to the other end 52 of the liquid level sensor 50. As it approaches, it floats up along the long axis side wall portions 14D and 15D of the cover 10E, and a predetermined liquid level K2 is detected.

When the liquid level sensor 50 is housed in the cover 10E, its base end 52 is located closer to the upper end wall portion 11D than the other end of the cover 10E on the side opposite to the upper end wall portion 11D. That is, the entire liquid level sensor 50 is located in the accommodation space S.

The cable 60 extends from the outside to the inside of the cover 10E through the guide portion 11Ed of the upper end wall portion 11D. The cable 30 is connected to a power supply device 40 provided outside the cover 10E.

The cable 60 extends along one of the major axis side wall portions 15D. The cable 60 is attached to one of the long axis side wall portions 15D by a band-shaped fastener 61 at a position at a predetermined distance from the liquid level sensor 50. For example, two insertion holes (not shown) are formed in the long shaft side wall portion 15D, and one end of the fastener 61 is inserted into the cover 10E through one of the insertion holes to insert the long shaft side wall portion 15D of the cable 60. The cable 60 is fixed to the cover 10E by leading through the side and again from the other insertion hole to the outside of the cover 10E.

The position of the cable 60 fixed by the fastener 61 is a fixed point P2, and the cable 60 is movably supported toward the long axis side wall portion 14D around the fixed point P2. The cable 60 is movable along the long axis La in the region between the fixed point P2 and the tip 51 of the liquid level sensor 50. The position of the fixed point P2 may be set, for example, so that the liquid level sensor 50 allows the axis x2 of the liquid level sensor 50 to be in a horizontal state.

A part of the outer peripheral surface of the liquid level sensor 50 is in contact with the long axis side wall portion 15D in a state of being suspended from the cover 10E via the cable 60. With the liquid level sensor 50 attached to the cover 10E, the axis x2 extending from one end 51 to the other end 52 of the liquid level sensor 50 faces from the long axis side wall portion 15D to the side of the long axis side wall portion 14D. Is tilted. The axis x2 of the liquid level sensor 50 is separated from the long axis side wall portion 15D with respect to the tip end 51 on the side of the base end 52 and is close to the long axis side wall portion 14D.

The dimension (50L + 60L) obtained by adding the length 50L of the liquid level sensor 50 and the distance from the fixed point P2 of the cable 60 to the tip 51 of the liquid level sensor 50 when the liquid level sensor 20 is floating and tilted horizontally is The distance d3 between the pair of long axis side wall portions 14D and 15D is set to be smaller.

[Operation of liquid level detection unit]
22A and 22B are views for explaining the operation of the liquid level detection unit 1E, FIG. 22A is a diagram showing an initial state of the liquid level sensor 50, and FIG. 22B is a diagram in which the liquid level sensor 50 is on the liquid level WL. It is a state which is a floating and tilted state and shows a state before detecting the liquid level K2, and (c) shows a state where the liquid level WL further rises and the liquid level sensor 50 tilts to detect the liquid level K2. It is a figure which shows. The liquid level K2 on the liquid level detected by the liquid level sensor 50 is arbitrarily set at a position at a predetermined interval from the grating 122 of the rainwater mass 100 along the hanging direction H of the liquid level sensor 20. The liquid level K2 is set at a position lower than the warning liquid level K1.

For example, when the rainwater mass 100 is provided with another piping port (not shown) below the piping port 111, the amount of rainfall is unexpectedly larger than the amount that can be flowed into the rainwater mass 100 through the grating 122 due to heavy rain. Rainwater may flow in. The water overflowing from another pipe port returns to the rainwater mass 100. As a result, the liquid level WL in the main body 110 of the rainwater mass 100 rises (see FIG. 22A).

As the liquid level of the amount of rainfall flowing into the rainwater mass 100 rises, water also enters the inside of the cover 10E from the side opposite to the upper end wall portion 11D. When the liquid level WL reaches the base end of the liquid level sensor 50, the liquid level sensor 50 emerges.

The distance d2 between the short axis side wall portions 12D and 13D in the cover 10E is only slightly larger than the maximum diameter of the liquid level sensor 50. The liquid level sensor 50 is tilted together with the cable 60 along the short axis side wall portions 12D and 13D, not in the direction of the short axis Sa and in the vertical direction, and toward the long axis side wall portion 14D along the direction of the long axis La. It floats up (see FIG. 22 (b)).

The liquid level sensor 50 has a mass larger than the buoyancy. In the liquid level sensor 50, the center point of buoyancy is on the side of the proximal end, and the center of gravity of the liquid level sensor 50 is located on the side of the tip end. Therefore, a rotational moment is generated in the liquid level sensor 50 due to the deviation between the center point of the buoyancy and the center of gravity. In the liquid level sensor 50, the tip 51 of the liquid level sensor 50 is tilted as the water surface WL rises due to the generation of the rotational moment, and the tip 51 of the liquid level sensor 50 is moved to the side of the base end 52 in the hanging direction H. The axis x2 approaches horizontally or substantially horizontally (see FIG. 12 (c)).

When the liquid level WL reaches the liquid level K2, for example, the axis x2 of the liquid level sensor 50 becomes horizontal or substantially horizontal, the internal sphere rolls, and the micro switch is turned on. The liquid level sensor 50 transmits a signal warning that the water surface WL in the rainwater mass 100 has reached the liquid level K2 to an external device.

Even when the liquid level in the cover 10E rises further, the floating of the liquid level sensor 50 is limited by the stopper 14. When the liquid level WL further rises beyond the stopper 14 and reaches the warning liquid level K1, the liquid level sensor 20 operates. The operation of the liquid level sensor 20 is the same as that of the first embodiment.

According to the liquid level detection unit 1A as described above, the liquid levels K1 and K2 can be detected at two different height positions in the hanging direction H of the liquid level detection unit 1A. For example, when the rainwater mass 100 is provided with two piping ports in the height direction, the liquid level WL reaches the liquid level K2 lower than the warning liquid level K1 before reaching the warning liquid level K1. It is possible to detect that water is flowing back from the lower pipe port. As a result, it is possible to recognize at an early stage that there is an increased possibility that water will overflow from the rainwater mass 100 before the liquid level WL reaches the warning liquid level K1.

Further, since the cover 10A has the guide path 13c, the cable 60 of the liquid level sensor 50 does not interfere with the floating of the liquid level sensor 20.

Further, since the cover 10A has the stopper 14, it is prevented that the liquid level sensor 50 floats up and interferes with the floating of the liquid level sensor 20.

<Others>
For example, the liquid level sensor 50 is provided on the side of the long axis side wall portion 15D facing the side of the long axis side wall portion 14D where the liquid level sensor 20 was provided, but is provided on the side of the long axis side wall portion 14D. It may have been.

Although the preferred embodiments 1 to 4 of the present invention have been described above, the present invention is not limited to the above-described fourth embodiment, and any aspect included in the concept of the present invention and the scope of claims can be used. include. In addition, each configuration may be selectively combined as appropriate so as to achieve at least a part of the above-mentioned problems and effects. Further, for example, the shape, material, arrangement, size, etc. of each component in the above four embodiments can be appropriately changed depending on the specific usage mode of the present invention.

1A, 1B, 1C, 1D, 1E ... Liquid level detection unit, 10A, 10B ... Plate unit, 10D ... Cover (cylindrical member), 11A ... Mounting plate, 11D ... Upper end wall, 11Da ... Short rib (1st) Rib), 11Db ... Longitudinal rib (second rib), 11Dc, 11Ed ... Guide part, 12A ... Support plate (support part), 12D, 13D ... Short shaft side wall part, 13C ... Extension support plate (extension support part), 14D , 15D ... long axis side wall, 13A ... angle member, 14A ... insertion hole, 15A ... insertion hole, 16A ... protrusion plate, 16D ... hole, 17E ... guide path, 18E ... stopper, 20 ... liquid level sensor, 20L ... long 20R ... Diameter, 20Rmax ... Maximum diameter, 21 ... Tip (one end), 22 ... Base end (other end), 30 ... Cable, 30L ... Spacing, 31 ... Fastener, 40 ... Power supply, 41 ... Hook, 50 ... Liquid level sensor (second liquid level sensor), 50L ... Length, 51 ... Tip (one end), 52 ... Base end (other end), 60 ... Cable (another cable), 61 ... Fastener, 100 ... Drainage Equipment, rainwater mass, 101 ... binding tool, 110 ... main body, 111 ... piping port, 120 ... inflow part, 121 ... inflow opening, 122 ... glazing, La ... long axis, Sa ... short axis

Claims (14)

A float-type liquid level sensor that is suspended in the drainage facility via a cable and detects that the liquid level has reached a predetermined level.
A support portion extending in the extending direction of the cable in the drainage facility and supporting the liquid level sensor in a floating manner via the cable.
Equipped with
In the liquid level sensor, the extension direction of the axis extending from one end to which the cable is connected toward the other end on the opposite side of the cable while being supported by the support portion intersects with the extension direction of the cable. A liquid level detection unit for drainage equipment, which is characterized by the fact that it does. An extension support portion connected to the lower end of the support portion in the hanging direction of the liquid level sensor, and an extension support portion.
A float type first that is supported by the extension support portion via a cable other than the cable so as to be floatable, and detects that the liquid level has reached a predetermined liquid level below the predetermined liquid level. 2 liquid level sensor and
Equipped with
The liquid level detection unit for drainage equipment according to claim 1, wherein the second liquid level sensor has an extension direction intersecting with the extension direction of the other cable in a state of being supported by the extension support portion. .. The support portion and the extension support portion are plate-shaped members.
At least one of the support portion and the extension support portion has a pair of projecting plates projecting toward the liquid level sensor and the second liquid level sensor along each edge extending in the hanging direction.
The pair of projecting plates are characterized in that the liquid level sensor and the second liquid level sensor are separated from each other so as to allow only floating in a direction away from the support portion and the extension support portion. The liquid level detection unit for the drainage facility according to Item 2. At least one of the support portion and the extension support portion has a plurality of fixing positions that enable fixing of the cable and the other cable in the hanging direction of the liquid level sensor and the second liquid level sensor. The liquid level detection unit for drainage equipment according to claim 2 or 3, which is characterized by this. A claim comprising a mounting portion at the upper end of the support portion in the hanging direction of the liquid level sensor, extending vertically from the support portion to the side on which the liquid level sensor is supported and attached to the drainage facility. The liquid level detection unit for the drainage facility according to any one of Items 1 to 4. A pair of short-axis side walls that are closed at one end and open at the other end, have a short axis and a long axis in a cross section orthogonal to the extending direction, and face each other in the direction of the short axis. And a cylindrical member having a pair of long axis side wall portions facing each other in the direction of the long axis.
A float type that is suspended from one end of the tubular member toward the other end via a cable and accommodated in the tubular member, and detects that the liquid level has reached a predetermined liquid level. With the liquid level sensor,
Equipped with
The cable for suspending the liquid level sensor is attached to one of the pair of long axis side wall portions.
The axis of the liquid level sensor extending from one end of the liquid level sensor to which the cable is connected toward the other end on the opposite side of the cable is from one of the long axis side wall portions to the long axis side wall portion. A liquid level detection unit for drainage facilities that is characterized by being tilted toward the other side. The distance between the pair of short axis side walls is set so as to prevent the liquid level sensor from floating along the short axis.
The sixth aspect of claim 6 is characterized in that the distance between the pair of long axis side wall portions is set so that the liquid level sensor floats along the long axis to allow detection of the predetermined liquid level. Liquid level detection unit for drainage equipment. The drainage facility according to claim 6 or 7, wherein the tubular member has at least one hole on one end side of the liquid level sensor in a suspended state. Liquid level detection unit for. The closed end of the tubular member
With at least one first rib protruding along the short axis side wall portion on the side opposite to the other end.
With at least one second rib protruding along the long axis side wall portion on the side opposite to the other end.
Have,
6. The liquid level detection unit for drainage equipment described in item 1. It is suspended below the liquid level sensor from one end to the other end of the tubular member via a cable different from the cable, and is housed in the tubular member. One of claims 6 to 9, further comprising a float-type second liquid level sensor that detects that another predetermined liquid level has been reached below the liquid level to be detected. Liquid level detection unit for drainage equipment described in. The axis extending from one end of the second liquid level sensor to which the other cable is connected along the other end on the opposite side of the other cable is from the other end of the long axis side wall portion to the long axis side wall portion. The liquid level detection unit for a drainage facility according to claim 10, wherein the liquid level detection unit is tilted toward one side. 15. Liquid level detection unit for drainage equipment. The tubular member is provided between the liquid level sensor and the second liquid level sensor in the hanging direction, and the liquid level sensor is provided with respect to a position corresponding to the other predetermined liquid level. The liquid level detection unit for drainage equipment according to any one of claims 10 to 12, wherein a stopper for preventing the second liquid level sensor from floating is provided on the side. The cross-sectional shape of the liquid level sensor intersecting the axis extending from one end of the liquid level sensor to which the cable is connected along the other end opposite to the cable is circular. The liquid level detection unit for drainage equipment according to any one of claims 1 to 13.

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