DE112021004565T5 - LIQUID LEVEL DETECTOR UNIT FOR DRAINAGE SYSTEM - Google Patents

Abstract

To provide a technology by which, while attachment of foreign matter to a floating liquid level sensor is suppressed, the degree of freedom in installing a liquid level sensor is increased, and it is easier to tilt and float a cable (30) is suspended in a drainage system and detects that a liquid surface has reached a certain liquid level, and a carrier (12A) running in the direction of the cable (30) in the drainage system and the liquid level sensor (20) via the Carrying cable (30) in such a way that it can float. When the liquid level sensor (20) is carried on the carrier (12A), the direction of an axis (x1) running from one end (21) connected to the cable (30) to the other end (22) on the cable (30) Averted side runs, the direction of travel of the cable (30).

Description

technical field

The present invention relates to a liquid level detector unit for a drainage system.

background technology

In recent years, water damage has occurred in many places as a result of climate change. The incidence of water damage is increasing every year, and the extent of the damage is also increasing. For example, when a sudden downpour occurs, a large amount of rainwater on the roads flows into sewers, rivers, roadside gullies, and the like. If the inflowing water volume exceeds an expected level, sewers, rivers, roadside gullies and the like will overflow, and may disrupt transportation and damage homes from water ingress.

For example, a FLYGT water level sensor (liquid level detecting unit) is known (see, e.g., Patent Document 1), which is provided in a cylindrical member extending in the vertical direction inside a dirty water tank (drainage system) for collecting dirty water such as sewage or rainwater. and a suspension cable and a plurality of float switches (liquid level sensors). The liquid level detecting device is fixed in a box which is hollow inside. The float switches are turned on when they are tilted upwards more than a specified movement angle set above the horizontal, and detect an allowable specified liquid level (hazardous liquid level).

quote list

patent documents

patent document 1 JP 2012-26109 A

Overview of the invention

Technical task

Also, detecting changes in liquid level in a stormwater drain provided around houses is important in view of recognizing the occurrence of water damage. A latticed cover like a grating is used for a rainwater drain. It can happen that more rainwater than expected flows through the grating into the rainwater drain. When a liquid surface suddenly rises, the float switches disclosed in Patent Document 1 may be subjected to buoyancy, which pushes the float switches vertically upward.

The present invention has been made with this problem in mind and has as an object to provide a technology by which a float type liquid level sensor can be tilted and rised more easily.

means of solving the task

In order to achieve this object, a liquid level detecting unit according to the present invention comprises a floating liquid level sensor which is suspended via a cable in a drainage system and detects that a liquid surface has reached a certain liquid level, and a bracket which is arranged in the extending direction of the cable in the Drainage system runs and carries the liquid level sensor via the cable such that it can be floated, characterized in that when the liquid level sensor is worn by the wearer, the direction of extension of an axis that runs from one end connected to the cable to the other end on the side facing away from the cable is the direction of extension of the cable crosses.

The liquid level detector unit according to an aspect of the present invention includes an extension beam that is connected to a lower end of the beam in the suspension direction of the liquid level sensor, and a second float type liquid level sensor that is floatably carried on the extension beam via a cable other than the above cable and detects that the liquid surface has reached a certain liquid level below the above certain liquid level, wherein in the second float type liquid level sensor, the direction of travel may cross the direction of travel of the other cable when carried by the extension bracket.

Further, in the liquid level detection unit according to an aspect of the present invention, the bracket and the extension bracket are plate-shaped members, and the bracket and/or the extension bracket has a pair of protruding plates formed along the respective edges extending in the hanging direction on the Side of the liquid level sensor and the second liquid level sensor protrude, wherein the pair of protruding plates is spaced from each other such that only a floating of the liquid level sensor and the second liquid level sensor in the direction away from the beam or extension beam.

Further, in the liquid level detection unit according to an aspect of the present invention, the bracket and/or the extension bracket may have a plurality of fixing points in the direction of hanging the liquid level sensor and the second liquid level sensor, to which the cable or the other cable can be fixed.

In the liquid level detection unit according to an aspect of the present invention, there is further included a fixing part that is fixed to the drainage system and extends at the upper end of the bracket in the direction of hanging the liquid level sensor from the bracket perpendicularly to the side on which the liquid level sensor is supported .

In order to achieve the above object, the liquid level detector unit according to the present invention further comprises a cylindrical member formed in a cylindrical shape such that one end is closed and the other end is open, which has a short axis and a long axis in a cross section orthogonal to the extending direction, and a pair of short-axis-side side walls that face each other in the short-axis direction, and a pair of long-axis-side side walls that face each other in the long axis direction, and a float liquid level sensor connected by a cable from one end to the other end of the cylindrical member is suspended and accommodated in the cylindrical member, and detects that the liquid surface has reached a certain liquid level, characterized in that the cable on which the liquid level sensor is suspended is fixed to one of the pair of long-axis side side walls, and the axis of the liquid level sensor , which extends from one end of the liquid level sensor connected to the cable to the other end on the side remote from the cable, from which one long-axis side wall is inclined toward the other long-axis side wall side.

Further, in the liquid level detector unit according to an aspect of the present invention, the distance between the pair of short-axis side walls can be adjusted so as to prevent the liquid level sensor from floating along the short axis, and the distance between the pair of long-axis side walls can be adjusted so that a Floating of the liquid level sensor along the long axis and detecting the specific liquid level is allowed.

In the liquid level detection unit according to an aspect of the present invention, the cylindrical member has at least one hole on the one end side with respect to the liquid level sensor in the suspended state of the liquid level sensor.

In the liquid level detection unit according to an aspect of the present invention, the closed one end of the cylindrical member further has at least one first rib protruding along the short-axis side wall to the side opposite to the other end, and at least one second rib protruding along the long-axis side wall to the the side opposite the other end, wherein the at least one first rib and the at least one second rib can carry connecting brackets for connecting the cylindrical component to the drainage system.

In the liquid level detection unit according to an aspect of the present invention, there is further further included a second float liquid level sensor suspended from one end to the other end of the cylindrical member below the liquid level sensor and accommodated in the cylindrical member via a cable other than the above cable and detects that another predetermined liquid level below the liquid level detected by the above liquid level sensor has been reached.

Further, in the liquid level detection unit according to an aspect of the present invention, the axis running from one end of the second liquid level sensor connected to the cable to the other end on the opposite side from the cable is from the other long-axis side wall toward one side of the long-axis side wall inclined.

Further, in the liquid level detecting unit according to an aspect of the present invention, a guide path for guiding the other cable is formed on the other long-axis side side wall at a position not in contact with the liquid level sensor in the floating state.

In the liquid level detection unit according to an aspect of the present invention, a stopper provided in the suspension direction between the liquid level sensor and the second liquid level sensor is further provided on the cylindrical member, and with respect to a position corresponding to the other determined liquid level, the second liquid level sensor is prevented from floating to the liquid level sensor side.

Further, in the liquid level detecting unit according to an aspect of the present invention, the cross-sectional shape of the liquid level sensor crossing the axis running from one end of the liquid level sensor connected to the cable to the other end on the opposite side from the cable is round.

Effects of the invention

According to the invention, the tilting and floating of the float liquid level sensor becomes easier.

character list

• [ 1 ] 1 (a) Fig. 12 is a perspective view from above showing a state where the liquid level detector unit according to the first aspect of the present invention is fixed to a grating, and (b) is a perspective view from below showing a state where the liquid level detecting unit is on grating is attached.
• [ 2 ] 2 12 is a perspective view of the liquid level detection unit according to a first embodiment of the present invention.
• [ 3 ] 3 (a) Fig. 14 is a perspective view seen from above and (b) is a perspective view seen from below of a disk unit.
• [ 4 ] 4 12 are views for explaining the structure of the liquid level sensor according to the first embodiment of the present invention, in which (a) is a perspective view of the liquid level sensor, and (b) is a side view of the liquid level sensor.
• [ 5 ] 5 Fig. 14 is a side view showing the state where the liquid level sensor is attached to the disk unit.
• [ 6 ] 6 are views for explaining the operation of the liquid level detecting unit according to the first embodiment of the present invention, in which (a) is a view showing the initial state of the liquid level sensor, and (b) is a view showing the state upon detection of a dangerous Liquid level shows, in which the liquid level sensor floats on the liquid surface.
• [ 7 ] 7 14 is a perspective view of the liquid level detection unit according to a modification of the first embodiment of the present invention.
• [ 8th ] 8th Fig. 14 is an explanatory view regarding the dimensions of the disk unit and the liquid level sensor.
• [ 9 ] 9 14 is a perspective view of the liquid level detecting unit according to a second embodiment of the present invention.
• [ 10 ] 10 12 is a side view of the liquid level detection unit according to the second embodiment of the present invention.
• [ 11 ] 11 are views for explaining the operation of the liquid level detecting unit according to the second embodiment of the present invention, in which (a) is a view showing the initial state of the liquid level sensor, and (b) is a view showing a state in which the liquid level sensor inclines and detects a liquid level, which is a state where the liquid level sensor floats on the liquid surface.
• [ 12 ] 12 (a) Fig. 13 is a perspective view for explaining the structure of a stormwater drain to which the liquid level detecting unit according to a third embodiment of the present invention is attached, and (b) is a cross section of the stormwater drain taken along a line bb in (a).
• [ 13 ] 13 12 is a perspective projection of the liquid level detector unit according to the third embodiment of the present invention.
• [ 14 ] 14 12 are perspective views of a cover, (a) being a perspective view viewed from below and (b) being a view viewed from above of the cover.
• [ 15 ] 15 is a plan view of the cover.
• [ 16 ] 16 Fig. 12 is a cross section showing the state where the liquid level sensor is attached to the cover.
• [ 17 ] 17 Fig. 14 is a view for explaining the dimensions of the cover and the liquid level sensor.
• [ 18 ] 18 Fig. 12 is a cross section showing the state where the liquid level detecting unit is attached to the grate.
• [ 19 ] 19 are views for explaining the operation of the liquid level detecting unit according to the third embodiment of the present invention, in which (a) is a view showing the initial state of the liquid level sensor, (b) is a view showing the state before detection of a hazardous liquid level K 12 which is a state where the liquid level sensor is floating on the liquid surface WL, and (c) is a view showing the state where the liquid level sensor tilts and detects a hazardous liquid level.
• [ 20 ] 20 12 are perspective projections for explaining the structure of a liquid level detecting unit according to a fourth embodiment of the present invention, in which (a) is a perspective view and (b) is a front view.
• [ 21 ] 21 are cross sections of the liquid level detecting unit, where (a) is a cross section taken along a line XXI(a) - XXI(a) in 20 (b) and (b) a cross section taken along a line XXI(b) - XXI(b) in 20 (b) is.
• [ 22 ] 22 are views for explaining the operation of the liquid level detecting unit according to a fourth embodiment of the present invention, in which (a) is a view showing the initial state of the liquid level sensor, (b) is a view of the state before detection of the liquid level, which is a state in which the liquid level sensor floats on the liquid surface, and (c) is a view showing the state in which the liquid level sensor tilts and detects the liquid level.

[Forms for carrying out the invention]

In the following, forms for carrying out the present invention will be explained based on the figures.

<First Embodiment>

A liquid level detecting unit 1A according to the first embodiment of the present invention is fixed, for example, to a grating 122 of a drainage system such as a gutter draining rainwater and the like. The liquid level detection unit 1A detects that the liquid surface in a stormwater drain has reached a certain liquid level (hereinafter also referred to as “hazardous liquid level”) K1 when an amount of water exceeding the allowable amount has entered the drainage system and the water level (liquid level) has risen is. The liquid level detecting unit 1A is used in a known drainage system, for example, and the drainage system used is not limited to a specific drainage system. For example, the liquid level detection unit 1A according to this embodiment of the present invention is mounted on an in 1 shown grid-shaped grating 122 attached, which is provided on a drainage system.

1 (a) 12 is a top perspective view showing a state where the liquid level detector unit 1A according to the first embodiment of the present invention is fixed to the grid 122, and (b) is a bottom perspective view showing a state where the liquid level detector unit 1A 1A is attached to the grating 122.

The liquid level detector unit 1A according to the present embodiment, which is fixed to the grating 122, comprises a floating liquid level sensor 20 which is suspended in a drainage system via a cable 30 and detects that a liquid surface WL has reached the specified liquid level K1, and a Support (hereinafter also referred to as “support plate”) 12A which runs in the extending direction of the cable 30 in the drainage system 100 and supports the liquid level sensor 20 via the cable 30 in a floating manner. In the liquid level sensor 20, when carried on the bracket 12A, the direction of extension of an axis x1, which extends from one end 21 connected to the cable 30 to the other end on the opposite side to the cable 30, crosses the direction of extension of the cable 30. The structure will be explained below of the liquid level detecting unit 1A is explained concretely.

[Liquid Level Detector Unit]

2 12 is a perspective view of the liquid level detection unit 1A according to the first embodiment of the present invention. The liquid level detecting unit 1A is fixed to the grating 122 of the drainage system from the inside. The liquid level detecting unit 1A is fixed to the grating 122 via connecting brackets 101 made of stainless steel. The liquid level detection unit 1A includes a panel unit 10A, the liquid level sensor 20, the cable 30 and a power supply device 40.

(disk unit)

3 12 are perspective views of the disk unit 10A, in which (a) is a perspective view of the disk unit 10A seen from above, and (b) is a perspective view seen from below. The plate unit 10A is composed of a mounting plate 11A and a support plate 12A. The plate unit 10A is a member in which the fixing plate 11A and the support plate 12A are connected to each other in 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 components 13A.

The fixing plate 11A is a rectangular plate component in plan view, which is formed of a plastic, metal or the like. The mounting plate 11A can be supported on the grating 122 via the connecting brackets 101 made of stainless steel. The mounting plate 11A has a plurality of through holes 14A.

The fixing plate 11A is fixed to the grating 122 by passing the connecting brackets 101 through the passing holes 14A.

The support plate 12A is a rectangular plate component in plan view, which is formed of a plastic, metal or the like. The support plate 12A is fixed perpendicularly to the mounting plate 11A via the angle components 13A. The support plate 12A is connected to each other in a state where a short side abuts with the short side of the attachment plate 11A. The support plate 12A runs perpendicular to the grating 122. The support plate 12A carries the liquid level sensor 20 via the cable 30.

The support plate 12A has a plurality of paired through holes 15A along the longitudinal direction. The plurality of paired penetration holes 15</b>A are provided at a certain interval along the longitudinal direction, which become fixing points of the cable 30 . The liquid level sensor 20 is floatably supported on the cable 30 by means of a band-shaped fastening element 31 from the support plate 12A.

(Liquid Level Sensor and Cable)

4 12 are views for explaining the structure of the liquid level sensor 20, in which (a) is a perspective view of the liquid level sensor 20, and (b) is a side view of the liquid level sensor 20. FIG. The liquid level sensor 20 is a float type sensor. The liquid level sensor 20 is suspended by the cable 30 from the disk unit 10A. The liquid level sensor 20 is supported by the support plate 12A by fixing the cable 30 to the support plate 12A. The liquid level sensor 20 detects a hazardous liquid level K1 in that, as a result of a rising liquid level, it inclines in a suspension direction H along the vertical direction in such a way that an end 21 connected to the cable 30 approaches another end 22 on the side facing away from the cable 30 .

The liquid level sensor 20 has a weight (not shown), a ball (not shown), a micro switch (not shown), and the like inside. The liquid level sensor 20 has a float function where the weight is greater than the buoyancy. The liquid level sensor 20 is not particularly limited, and a known float type sensor can be used.

Along the axis x1, which passes through the center of the liquid level sensor 20, the cross-sectional shape of the liquid level sensor 20 is teardrop-shaped or substantially teardrop-shaped. The cross-sectional shape of the liquid level sensor 20 crossing the axis x1 is round or substantially round. A diameter 20R of the cross-sectional shape of the liquid level sensor 20 increases continuously along the axis x1 from one end 21 to the other end 22 from the front end (first end) side to which the cable 30 is fixed.

A length 20L of the liquid level sensor 20 along the axis x1 is greater than a maximum diameter 20Rmax of the liquid level sensor. 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 20Rmax.

5 12 is a side view showing the state where the liquid level sensor 20 is attached to the disk unit 10A. The cable 30 from which the liquid level sensor 20 is suspended is fixed to the support plate 12A. The cable 30 is fixed in the hanging direction H from the top of the supporting board 12A of the board unit 10A. In the course of approaching the axis x1 passing through the center of a base end (other end) 22 located on the opposite side from the front end 21 with respect to the suspension direction H from the front end 21, for example to a horizontal state, at the liquid level sensor 20 a switch is turned on.

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

The cable 30 runs along the support plate 12A. The cable 30 is fixed to the support plate 12A at a position a certain distance from the liquid level sensor 20 by means of the band-shaped fixing member 31 . For example, the cable 30 is fixed to the support plate 12A by passing one end of the fastener 31 through one of the pair of penetration holes 15A of the support plate 12A and leading out the other penetration hole 15A.

The cable 30, in which the position where the cable 30 is fixed by the fixing member 31 is assumed to be the fixing point P1, is movably supported about this fixing point P1 in the direction away from the support plate 12A. The cable 30 is movable in a range between the fixed point P<b>1 and the front end 21 of the liquid level sensor 20 . For example, the location of the fixed point P1 should be provided such that the liquid level sensor 20 allows the axis x1 of the liquid level sensor 20 to come into a horizontal state.

The liquid level sensor 20 in a state suspended from the support plate 12A via the cable 30 is in contact with a part of the support plate 12A. The axis x1, which runs from one end 21 to the other end 22 of the liquid level sensor 20 in a state where the liquid level sensor 20 is fixed to the support plate 12A, crosses the extending direction of the cable 30. Further, the axis x1 of the liquid level sensor 20 also crosses the support plate 12A. The liquid level sensor 20 is supported by the support plate 12A such that the axis x1 on the base end 22 side with respect to the front end 21 deviates from the support plate 12A.

With the liquid level sensor 20 floating on the liquid surface WL in the direction away from the support plate 12A so that the axis x1 of the liquid level sensor 20 tends to approach a horizontal state, it is detected that the liquid surface WL has reached the hazardous liquid level K1. That is, when the liquid level sensor 20 detects the hazardous liquid level K1, the liquid level sensor 20 floats on the liquid surface WL, the front end 21 approaches the base end 22 of the liquid level sensor 20 with respect to the suspension direction H and the distance between the front end 21 and the base end 22 becomes shorter.

(power supply device)

The power pack device 40 is attached to the support plate 12A on the side facing away from the liquid level sensor 20 . The cable 30 is electrically connected to the power pack device 40 . The power supply device 40 supplies power to the liquid level sensor 20 via the cable 30 .

[Operation of Liquid Level Detecting Unit]

6 12 are views for explaining the operation of the liquid level detecting unit 1A according to the first embodiment of the present invention, in which (a) is a view showing the initial state of the liquid level sensor 20 and (b) is a view showing the state upon detection of the liquid level sensor 20 Hazardous liquid level K1 shows, in which the liquid level sensor 20 floats on the liquid surface WL. It happens, for example, that due to heavy rain, rainwater of an unexpected amount of rain flows through the grating 122 into the drainage system. As a result, the liquid surface WL in the drainage system increases (cf. 6 (a) ).

The hazardous liquid level K1 of the liquid surface WL detected by the liquid level sensor 20 can be set arbitrarily at a point at a specific distance h along the suspension direction H of the liquid level sensor 20 starting from the grating 122 . If the liquid surface WL reaches the hazardous liquid level K1, this becomes an indicator, for example, that there is a risk of water overflowing from the grating 122. For example, the liquid level sensor 20 can detect the liquid level at a specific height position from the base end 22 . By adjusting the length of the cable 30 and suitably changing the suspension position of the liquid level sensor 20, the specific height position from the base end 22 passing through the axis x1 can be adjusted to the arbitrarily set hazardous liquid level K1.

Due to the increase in the amount of rain flowing in through the grating 122, the liquid surface WL reaches the base end 22 of the liquid level sensor 20, so that the liquid level sensor 20 floats. The liquid level sensor 20 inclines with the cable 30 and floats away from the support plate 12A.

With the liquid level sensor 20, the weight is greater than the buoyancy. In the liquid level sensor 20, the center of buoyancy is located on the base end 22 side, and the center of gravity of the liquid level sensor 20 is positioned on the front end 21 side. Therefore, the liquid level sensor 20 generates a torque due to the fact that the center of gravity deviates from the center of buoyancy. In the liquid level sensor 20, due to the generation of the torque, the front end 21 of the liquid level sensor 20 inclines due to the rise of the liquid surface area WL, so that the front end 21 of the liquid level sensor 20 approaches the base end 22 side with respect to the suspension direction H and the axis x1 of the approaches the horizontal or substantially horizontal (cf. 6 (b) ).

If the liquid surface WL has reached the hazardous liquid level K1 and the axis x1 of the liquid level sensor 20 exceeds, for example, a certain angle to the support plate 12A, a ball rolls inside and the microswitch is switched on. The liquid level sensor 20 sends a signal to an external device, which warns that the liquid surface WL in the drainage system has reached the hazardous liquid level K1.

By mounting such a liquid level detecting unit 1A in the drainage system, the possibility of occurrence of water damage can be known in advance. According to the liquid level detecting unit 1A, the liquid level sensor 20 is fixed together with the cable 30 to the support plate 12A in a state where the axis x1 is inclined to the extending direction of the cable 30. Consequently, when the liquid surface WL rises up to the base end 22, the liquid level sensor 20 does not float in the vertical direction but floats away from the support plate 12A together with the cable 30 below the fixing point P1. As a result, the liquid level sensor 20 receives buoyancy more easily, so that the liquid level sensor 20 floats up without problems.

Further, in the support plate 12A, the plurality of paired penetration holes 15A are provided at a certain pitch along the longitudinal direction, so that the position of the fixing point P1 of the cable 30 with respect to the support plate 12A can be appropriately selected. For example, by increasing the distance between the front end 21 of the liquid level sensor 20 and the fixing point P1, the curvature of the wire 30 when the liquid level sensor 20 floats increases, so that the load on the wire 30 can be reduced.

Further, by reducing the distance between the front end 21 of the liquid level sensor 20 and the fixed point P1, the curvature of the cable 30 when the liquid level sensor 20 is floated becomes smaller, so that the space required for the liquid level sensor 20 to be floated can be made small. This increases the degree of freedom with respect to the mounting object of the liquid level detection unit 1A.

By connecting the mounting plate 11A to the support plate 12A, it is possible to prevent the foreign bodies flowing in from the grating 122 from adhering directly to the liquid level sensor 20, and incorrect detection of the liquid level sensor 20 reaching the hazardous liquid level K1 when the liquid level sensor 20 is damaged by water flowing in is unintentionally made to vibrate can be avoided with certainty.

<Other>

For example, the plate unit 10A has been fixed to the grating 122 via the fixing plate 11A, but no fixing plate 11A may be provided. In this case, the support plate 12A can be attached to the grating 122 via a metal angle component 13A.

Further, the support plate 12A may include a pair of protruding plates 16A, for example. 7 14 is a perspective view of a liquid level detecting unit 1B according to a modification. The pair of projecting plates 16A project along the respective longitudinal edge (long side) toward the side where the liquid level sensor 20 is supported. The protruding plates 16A are provided on the side of each long side opposite to each other. The protruding plates 16A are spaced from each other in the transverse direction such that the liquid level sensor 20 is allowed to float only in the direction away from the support plate 12A. The protruding plates 16A are fixed on the side of the short side opposite to the fixing plate 11A. The liquid level sensor 20 is positioned between the pair of projecting plates 16A.

By the liquid level sensor 20 floating between the pair of projecting plates 16A on the liquid surface WL in the direction away from the support plate 12A so that the axis x1 of the liquid level sensor 20 tends to approach a horizontal state, it is detected that the liquid surface WL has reached the hazardous liquid level K1. That is, when the liquid level sensor 20 detects the hazardous liquid level K1, the liquid level sensor 20 floats on the liquid surface WL, the front end 21 approaches the base end 22 of the liquid level sensor 20 with respect to the suspension direction H and the distance between the front end 21 and the base end 22 is getting shorter. The hazardous liquid level K1 at the liquid level detecting unit 1B should be set between the pair of protruding plates 16A in the hanging H direction.

(Relationship between the plate unit and the liquid level sensor)

8th 12 is a view for explaining dimensions of the plate unit 10B and the liquid level sensor 20. A distance d1 between the pair of protruding plates 16A is smaller than a length 20L of the liquid level sensor 20 (d1 < 20L). The distance d1 is slightly larger than the maximum diameter 20Rmax of the liquid level sensor 20 (d1 > 20Rmax). For example, it is preferable that the distance d1 is 1.10 to 1.30 times the maximum diameter 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 detecting unit 1B mentioned above, at least the same effects as the liquid level detecting unit 1A are produced. In addition, the direction in which the liquid level sensor 20 floats between the pair of projecting plates 16A can be positively restricted. Thereby, the degree of freedom in attachment of the liquid level detecting unit 1B can be increased.

Since the liquid level sensor 20 has a round cross-sectional shape, even if the liquid level sensor 20 contacts the protruding plates 16A, it is a point contact, so that the movement in the direction away from the support plate 12A can be prevented from being disturbed.

<Second embodiment>

Next, a liquid level detecting unit 1C according to a second embodiment will be explained. 9 14 is a perspective view of the liquid level detecting unit 1C according to the second embodiment. The illustration of the power supply device 40 has been omitted. In the following, the parts different from the liquid level detecting unit 1A will be mainly explained, and the same parts as in the liquid level detecting unit 1A will be given the same reference numerals and the explanation thereof will be omitted.

The liquid level detection unit 1C comprises the plate unit 10C, an extension support plate (extension support) 13C, the liquid level sensor 20, a liquid level sensor (second liquid level sensor) 50, the cable 30, a cable (another cable) 60 and the power supply device 40.

The extension support plate 13C is a plate component rectangular in front view formed of a plastic, metal or the like. The extension support plate 13C is fixed to the support plate 12A via two metal plates 14C. The extension support plate 13C has a short side connected thereto in a state of abutting with the short side of the support plate 12A on the opposite side (lower side with respect to the suspension direction H) from the attachment plate 11A. The extension support plate 13C is perpendicular to the grid 122. The support plate 12A supports the liquid level sensor 20 via the cable 30. The extension support plate 13C has a plurality of paired through holes (not shown) along the longitudinal direction. The plurality of paired penetration holes are provided at a certain interval along the longitudinal direction, and become fixing positions of the cable 60. The liquid level sensor 50 is floatably supported on the cable 60 by means of a band-shaped fastener 61 on the extension support plate 13C.

The liquid level sensor 50 is a float type sensor. The liquid level sensor 50 is suspended by the cable 60 from the extension support plate 13C. The liquid level sensor 50 is supported by the extension support plate 13C by fixing the cable 60 to the extension support plate 13C. The liquid level sensor 50 detects that the liquid surface has reached a liquid level K2 below the hazardous liquid level K1 by inclining due to an increase in the liquid surface in the suspension direction H such that an end 51 connected to the cable 60 faces the other end 52 on the side facing away from the cable 60 approaches. The liquid level sensor 50 has the same structure as the liquid level sensor 20.

10 12 is a side view of the liquid level detecting unit 1C. The cable 60 on which the liquid level sensor 50 is suspended is fixed to the extension support plate 13C. The cable 60 is electrically connected to the liquid level sensor 50 . The cable 60 runs from the side of the support plate 12A along the extension support plate 13C. One end of the cable 60 is connected to the front end side (one end) 51 of the liquid level sensor 50 . The other end of the cable 60 is connected to the power supply device 40 provided on the back of the support plate 12A.

In a state suspended along the extension support plate 13C, the cable 60 is fixed from above with respect to the hanging direction H along the longitudinal direction of the support plate 12A. In the course of approaching an axis x2 passing through the center of the base end (other end) 52 located on the opposite side to the front end 51 from the front end 51 with respect to the suspension direction H, for example, to a horizontal state, at the liquid level sensor 50 turns on a switch.

The cable 60 runs along the extension support plate 13C. The cable 60 is fixed to the extension support plate 13C at a position a certain distance from the liquid level sensor 50 by means of the band-shaped fixing member 61 . For example, the cable 60 is fixed to the extension support plate 13C by passing one end of the fastener 61 through one of the pair of penetration holes of the extension support plate 13C and passing out the other penetration hole.

The cable 60, assuming the position where the cable 60 is fixed by the fixing member 61 as the fixing point P2, is movably supported about this fixing point P2 in the direction away from the extension support plate 13C. The cable 60 is movable in a range between the fixed point P2 and the front end 51 of the liquid level sensor 50 . For example, the location of the fixed point P2 can be provided such that the axis x2 of the liquid level sensor 50 can come into a horizontal state.

The liquid level sensor 50 contacts a part of the extension support plate 13C in a state suspended from the extension support plate 13C via the cable 60 . The axis x2, which runs from one end 51 to the other end 52 of the liquid level sensor 50 in a state where the liquid level sensor 50 is fixed to the extension support plate 13C, crosses the extending direction of the cable 60. Further, the axis x2 of the liquid level sensor 50 also crosses the extension support plate 13C. The liquid level sensor 50 is supported by the extension support plate 13C such that the axis x2 on the base end 52 side with respect to the front end 51 deviates from the extension support plate 13C.

[Operation of Liquid Level Detecting Unit]

11 12 are views for explaining the operation of the liquid level detecting unit 1C, in which (a) is a view showing the initial state of the liquid level sensor 50 and (b) is a view showing a state in which a liquid level K2 has been detected in which the liquid level sensor 50 is inclined, which is a state in which the liquid level sensor 50 floats on the liquid surface WL. The liquid level K2 of the liquid surface detected by the liquid level sensor 50 can be set arbitrarily at a point at a specific distance starting from the grating 122 of the drainage system along the suspension direction H of the liquid level sensors 20, 50. The liquid level K2 is set at a point below the hazardous liquid level K1. The liquid level K2 of the liquid surface, , detected by the liquid level sensor 50, can be arbitrarily adjusted starting from the grating 122 along the suspension direction H of the liquid level sensor 50 at a point at a certain distance. The liquid level K2 is set at a point below the hazardous liquid level K1.

When the liquid surface WL reaches the base end 52 of the liquid level sensor 50 due to the increase in the amount of rain flowing in through the grating 122, the liquid level sensor 50 floats. The liquid level sensor 50 tilts together with the cable 60 and floats away from the extension support plate 13C. In the liquid level sensor 50, due to the rise of the liquid surface WL, the front end 51 of the liquid level sensor 50 inclines so that the front end 51 of the liquid level sensor 50 approaches the base end 52 side with respect to the suspension direction H and the axis x2 approaches the horizontal or substantially horizontal .

When the liquid surface WL has reached the liquid level K2 so that the liquid level sensor 50 floats while tilting, for example, when the axis x2 of the liquid level sensor 50 exceeds a certain angle to the extension support plate 13C, the ball rolls inside, and the micro switch is turned on. The liquid level sensor 50 sends in Signal to an external device that warns that the liquid surface WL in the drainage system is approaching the hazardous liquid level K1 (that the specific liquid level K2 has been reached). If the liquid surface WL continues to rise and reaches the hazardous liquid level K1, the liquid level sensor 20 is operated. The operation of the liquid level sensor 20 is the same as that of the first embodiment.

According to the liquid level detecting unit 1C mentioned above, at least the same effects as the liquid level detecting unit 1A are produced. In addition, the liquid level sensor 50 can be used to detect the liquid levels K1, K2 at two different height positions in the drainage system with respect to the suspension direction H of the liquid level detector unit 1C. For example, at a stage in which the liquid surface WL in the drainage system has reached the liquid level K2, which is lower than the hazardous liquid level K1, before the hazardous liquid level K1 is reached, a floating of the liquid surface WL can be detected.

As a result, it can be recognized at an early stage that the risk of water overflowing from the drainage system increases before the liquid surface WL reaches the hazardous liquid level K1.

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

<Third embodiment>

A liquid level detection unit 1D according to a third embodiment of the present invention will be explained below. 12 (a) 12 is a perspective view for explaining the structure of the stormwater drain 100 to which the liquid level detecting unit 1D according to the third embodiment is attached, and (b) is a cross section taken along a line bb in (a). In the following, the parts different from the liquid level detecting unit 1A will be mainly explained, and the same parts as in the liquid level detecting unit 1A will be given the same reference numerals and the explanation thereof will be omitted.

The liquid level detection unit 1</b>D according to the third embodiment is attached to, for example, the drainage system (hereinafter referred to as “stormwater drain”) 100 where rainwater flows into a sewer. The liquid level detection unit 1D detects that the liquid surface in the stormwater drain has reached the specified liquid level (hereinafter also referred to as “hazardous liquid level”) K1 when an amount of water exceeding the allowable amount overflowed from the sewer and rose in the stormwater drain. The liquid level detecting unit 1D is used for, for example, a well-known drainage system, and the drainage system used is not limited to a specific drainage system. For example, the liquid level detection unit 1D according to the embodiment of the present invention is installed at an in 12 Shown rainwater drain 100 used.

In the rainwater drain 100 rainwater collects in the terrain of a building such. B. a residential building. The rainwater drain 100 is made of concrete, for example. The rainwater drain 100 is laid underground and allows rainwater that has flowed in to flow off into a sewer, for example.

The rainwater drain 100 has a main section 110 and an inflow section 120 . The main portion 110 and the inflow portion 120 are integrally formed with each other. The main section 110 is buried underground. The main portion 110 is formed in a cylindrical shape. The main section 110 has a pipe opening 111 . A sewer, for example, is connected to the pipe hole 111, and the water that has flowed into the rainwater drain 100 is discharged into the sewer.

The inflow portion 120 is provided at an end portion of the main portion 110 with respect to the axial direction. When the rainwater drain 100 is installed in the ground, the inflow section 120 is exposed at the ground's surface. The inflow section 120 has an inflow opening 121 . Rainwater and the like, for example, flow into the main section 110 through the inflow opening 121 . The inflow opening 121 is closed by a grid-like cover such as the grid 122 .

In the above stormwater drain 100, the liquid level detecting unit 1D detecting/measuring the liquid level in the stormwater drain 100 is provided. The liquid level detection unit 1D according to the third embodiment includes a cylindrical member (hereinafter also referred to as “cover”) 10D formed in a cylindrical shape such that one end is closed and the other end is open, which has a cross section orthogonal to the extending direction short axis Sa and has a long axis La, and a pair of short axis side side walls 12D, 13D opposed to each other in the short axis Sa direction and a pair of long axis side side walls 14D, 15D opposed to each other in the long axis La direction, and the float- Liquid level sensor 20 suspended from one end to the other end of the cylindrical member 10D via the cable 30 is incorporated into the cylindrical member 10D and detects that the liquid surface has reached a certain liquid level. The cable 30 from which the liquid level sensor 20 is suspended is fixed to one of the pair of long-axis side walls 14D, 15D, and the axis x1 extending from one end of the liquid level sensor 20 connected to the cable 30 to the other end on the opposite side from the cable 30 extends is inclined from the one of the long-axis side walls 14D, 15D to the side of the other of the long-axis side walls 14D, 15D. The structure of the liquid level detection unit 1D will be concretely explained below.

[Liquid Level Detector Unit]

13 12 is a perspective projection through the liquid level detector unit 1D according to the third embodiment of the present invention. The liquid level detecting unit 1D is fixed to the grating 122 of the rainwater drain 100 from the main portion 110 side. The liquid level detecting unit 1D is fixed to the grating 122 of the rainwater drain 100 via connecting brackets 101 made of stainless steel. The liquid level detection unit 1D includes a cover 10D, the liquid level sensor 20, the cable 30 and the power supply device 40.

(Cover)

14 12 are perspective views of the cover 10D, (a) being a perspective view viewed from above and (b) being a view viewed from below of the cover 10D. The cover 10D is a cylindrical member with one end closed and the other end open. The cover 10D is an integrally molded member formed of, for example, a plastic. The cover 10D is a cylindrical member in which the cross-sectional shape orthogonal to the extending direction is elliptical or substantially elliptical.

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

The top end wall 11D closes one end of the cover 10D. The liquid level detecting unit 1D is fixed to the grating 122 at the upper end wall 11D. The cover 10D has short ribs (first ribs) 11Da and long ribs (second ribs) 11Db at the top end wall 11D. The short ribs 11Da extend along the long-axis side side walls 14D, 15D and protrude to the side opposite to the other end. The long ribs 11Db extend along the short-axis side side walls 12D, 13D and protrude to the side opposite to the other end. The short ribs 11Da and the long ribs 11Db can support the connecting brackets 101 for connecting the cover 10D to the drainage system 100.

The short ribs 11Da and the long ribs 11Db are parts formed in a thin plate shape. The numbers of the short ribs 11Da and the long ribs 11Db are not particularly limited. The respective short ribs 11Da extend along the short axis Sa. The short ribs 11Da are provided at equal intervals in the long axis La direction, respectively. The short ribs 11Da protrude from the upper end wall 11D to the side opposite to the accommodating space S. As shown in FIG.

The long ribs 11Db are orthogonal to the short ribs 11Da along the long axis La. The long ribs 11Db extend between the short ribs 11Da provided at both ends in the long axis La direction. The long ribs 11Db are respectively provided at equal intervals between one end and the other end of the short ribs 11Da in the direction of the short axis Sa.

The height of the short ribs 11Da and the long ribs 11Db is higher than the thickness of the cable 30 fixed to the top end wall 11D. This can prevent the cable 30 from contacting the grille 122 when the liquid level detecting unit 1D is fixed to the grille 122 .

The short ribs 11Da and the long ribs 11Db each have a support hole (not shown) for supporting the connecting brackets 101 made of stainless steel. The support opening at the respective short ribs 11Da is formed penetrating in the thickness direction of the short ribs 11Da. The support openings at the short ribs 11Da are provided between crossing positions of the short ribs 11Da and the long ribs 11Db.

The support opening at the respective long ribs 11Db is formed penetrating in the thickness direction of the long ribs 11Db. The support openings are provided between crossing positions of the short ribs 11Da and the long ribs 11Db.

According to the lattice pattern of the grate 122 to which the liquid level detector unit 1D is attached or according to the position of the grate 122 to which the liquid level detector unit 1D is attached, the connecting brackets 101 can be attached to an appropriate position by selecting support holes . The numbers of the short ribs 11Da, the long ribs 11Db and the support openings are not particularly limited.

On the upper end wall 11D, a guide 11Dc for guiding the cable 30 on which the liquid level sensor 20 is suspended is formed. The guide 11Dc is provided on the long-axis-side side wall 14D side in the long-axis La direction. The guide 11Dc guides the cable 30 from the outside of the cover 10D to the inside of the accommodating space S. The cable 30 is fixed to the guide 11Dc.

The pair of short-axis side walls 12D, 13D extends linearly along the long axis La. The short-axis side side walls 12D, 13D are each provided at a certain distance d2 from each other in the direction of the short axis Sa. The distance d2 between the respective short-axis side side walls 12D, 13D is set to a level that does not allow the liquid level sensor 20 to float in the short-axis Sa direction.

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

The pair of long axis side walls 14D, 15D extends between the ends of the pair of short axis side side walls 12D, 13D with respect to the long axis La direction. The long-axis-side side walls 14D, 15D extend outward from the accommodating space S in a convex circular-arc shape in plan view.

The pair of long axis side side walls 14D, 15D are provided at a certain distance d3 from each other in the long axis La direction. The distance d3 of the respective long-axis-side side walls 14D, 15D is set to an extent that allows the liquid level sensor 20 to float in the long-axis La direction according to the rise of the liquid surface and tilt to an extent that it can be detected at least that the liquid surface has reached the hazardous liquid level K1.

(Liquid Level Sensor and Cable)

The liquid level sensor 20 is a float type sensor. The liquid level sensor 20 is housed in a suspended state by the cable 30 inside the cover 10D. The liquid level sensor 20 detects a hazardous liquid level K1 in that it floats on the liquid surface in the cover 10D and as a result of a rising liquid level inside the cover 10D along the side walls 14D, 15D of the cover 10D on the longitudinal axis, so that the one with the cable 30 connected end 21 approaches the other end 22 on the opposite side from the cable 30 with respect to the suspension direction H.

In a hanging state inside the cover 10D, the cable 30 is fixed, in the hanging direction H along the longitudinal direction of the cover 10D, to one end (front end) 21 of the liquid level sensor 20 on the upper end wall 11D side. In the course of approaching the axis x1 passing through the center of the base end (other end) 22 located on the opposite side from the front end 21 with respect to the suspension direction H from the front end 21 to, for example, a horizontal state, at Liquid level sensor 20 the switch is turned on.

With the liquid level sensor 20 housed in the cover 10D, its base end 22 is positioned closer to the upper end wall 11D side than to the other end of the cover 10D on the side opposite to the upper end wall 11D. That is, the liquid level sensor 20 is positioned entirely inside the accommodating space S. FIG.

16 12 is a cross section showing the state where the liquid level sensor 20 is attached to the cover 10D. The cable 30 from which the liquid level sensor 20 is suspended is fixed to one long-axis side wall 14D of the pair of long-axis side walls 14D, 15D.

The cable 30 is electrically connected to the liquid level sensor 20 . The cable 30 passes inward from the outside of the cover 10D through the guide 11Dc of the top end wall 11D. One end of the cable 30 is connected to the front end 21 side of the liquid level sensor 20 . The other end of the cable 30 is connected to the power supply device 40 provided outside the cover 10D.

The cable 30 runs along the one long-axis side wall 14D. The cable 30 is fixed at a position a certain distance from the liquid level sensor 20 to the one long-axis side wall 14D by the band-shaped fixing member 31 . For example, the cable 30 is fixed to the cover 10D by forming two feedthrough holes (not shown) in the long-axis side wall 14D, one end of the fastening element 31 is guided from the one feedthrough hole into the interior of the cover 10D, the cable 30 the side passes through the long-axis-side side wall 15D and is led out of the other through hole to the outside of the cover 10D again.

The cable 30, in which the position where the cable 30 is fixed by the fixing member 31 is assumed to be the fixing point P1, is movably supported toward the long-axis side side wall 15D about this fixing point P1. The cable 30 is movable along the long axis La in a range between the fixed point P1 and the front end 21 of the liquid level sensor 20 . For example, the location of the fixed point P1 should be provided such that the axis x1 of the liquid level sensor 20 can come into a horizontal state.

The liquid level sensor 20 is in contact with a part of the outer peripheral surface of the long-axis side wall 14D in a state suspended from the cover 10D via the cable 30 . The axis x1 extending from one end 21 to the other end 22 of the liquid level sensor 20 in a state where the liquid level sensor 20 is fixed to the cover 10D is inclined from the long-axis side wall 14D to the long-axis side wall 15D side. The axis x1 of the liquid level sensor 20 on the base end 22 side with respect to the front end 21 recedes from the long-axis side wall 14D and approaches the long-axis side wall 15D.

(Relationship between the cover and the liquid level sensor)

17 12 is a view for explaining dimensions of the cover 10D and the liquid level sensor 20. A distance d2 between the pair of short-axis-side side walls 12D, 13D is shorter than the length 20L of the liquid level sensor 20 (d2<20L). The distance d2 is slightly larger than the maximum diameter 20Rmax of the liquid level sensor 20 (d2 > 20Rmax). For example, it is preferable that the distance d2 is 1.10 to 1.30 times the maximum diameter 20Rmax. The distance d2 should be set to prevent the liquid level sensor 20 from floating along the short axis Sa.

A distance d3 between the pair of long axis side side walls 14D, 15D is greater than the length 20L of the liquid level sensor 20 (d3 > 20L). The distance d3 should have a dimension at least larger than a dimension where the length 20L of the liquid level sensor 20 is a distance 30L from the fixed point P1 of the cable 30 to the front end 21 of the liquid level sensor 20 in a state where the liquid level sensor 20 floats and horizontally inclined was added (d3>L20+L30). The distance d3 should be set such that detection of the hazardous liquid level K1 is not hindered by floating of the liquid level sensor 20 along the long axis La direction at least in the course of the axis x1 approaching a horizontal state.

(power supply device)

The power supply device 40 is attached to the grating 122 . The cable 30 is electrically connected to the power pack device 40 . The power supply device 40 supplies power 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 fixed to the grating 122 by passing the connecting brackets 101 through the hooks 41 .

[Operation of Liquid Level Detecting Unit]

18 FIG. 12 is a cross section showing the state where the liquid level detecting unit 1D is fixed to the grid 122. FIG. In that the liquid level sensor 20 along the short-axis side side walls 12D, 13D in the direction of the long axis La on the liquid surface WL floats so that the axis x1 of the liquid level sensor 20 inclines approaching a horizontal state, it is detected that the liquid surface WL has reached the hazardous liquid level K1. That is, when the liquid level sensor 20 detects the hazardous liquid level K1, the liquid level sensor 20 floats on the liquid surface WL, the front end 21 approaches the base end 22 of the liquid level sensor 20 with respect to the suspension direction H and the distance between the front end 21 and the base end 22 is getting shorter.

The hazardous liquid level K1 of the liquid surface WL detected by the liquid level sensor 20 can be set arbitrarily at a point at a specific distance h, starting from the grating 122 of the rainwater drain 100 along the suspension direction H of the liquid level sensor 20 . If the liquid surface WL reaches the hazardous liquid level K1, this becomes an indicator, for example, that there is a risk of water overflowing from the rainwater drain 100. For example, the liquid level sensor 20 can detect the liquid level at a specific height position from the base end 22 . By adjusting the length of the cable 30 inside the cover 10D and appropriately changing the hanging position of the liquid level sensor 20, an arbitrarily set hazardous liquid level K1 can be met.

19 are views for explaining the operation of the liquid level detecting unit 1D, in which (a) is a view showing the initial state of the liquid level sensor 20, (b) is a view showing the state before detection of the hazardous liquid level K1 which is is a state where the liquid level sensor 20 floats on the liquid surface WL and is inclined, and (c) is a view showing the state when the liquid surface WL further rises, the liquid level sensor 20 inclines, and the hazardous liquid level K1 is detected. For example, it happens that due to a heavy rain, rainwater of an unexpected amount of rain larger than that which can be discharged in the sewer inside the rainwater drain 100 flows into the rainwater drain 100 through the grating 122 . The water overflowing from the pipe hole 111 returns inside the rainwater drain 100 . As a result, the liquid surface WL increases inside the main section 110 of the rainwater drain 100 (cf. 19 (a) ).

Due to the increase in the liquid level of the amount of water flowing into the stormwater drain 100, water also enters the inside of the cover 10D from the side opposite to the upper end wall 11D. When the liquid surface WL reaches the base end 22 of the liquid level sensor 20, the liquid level sensor 20 floats.

In the case of the cover 10D, the distance d2 between the side walls 12D, 13D on the short-axis side is only slightly larger than the maximum diameter 20Rmax of the liquid level sensor 20. The liquid level sensor 20 does not float in the direction of the short axis Sa or the plumb direction (suspension direction H), but together with the Cable 30, while inclining along the short-axis side sidewalls 12D, 13D, along the long-axis La direction toward the long-axis sidewall 15D (see Fig. 19 (b) ).

With the liquid level sensor 20, the weight is greater than the buoyancy. In the liquid level sensor 20, the center of buoyancy is located on the base end 22 side, and the center of gravity of the liquid level sensor 20 is positioned on the front end 21 side. Therefore, the liquid level sensor 20 generates a torque due to the fact that the center of gravity deviates from the center of buoyancy. In the liquid level sensor 20, due to the generation of the torque, due to an increase in the liquid surface area WL, the front end 21 of the liquid level sensor 20 inclines so that the front end 21 of the liquid level sensor 20 approaches the base end 22 side with respect to the suspension direction H and the axis x1 approaches the horizontal or substantially horizontal (cf. 19(c) ).

If the liquid surface WL has reached the hazardous liquid level K1 and the axis x1 of the liquid level sensor 20 exceeds a certain angle to the long-axis side walls 14D, for example, the ball rolls inside and the microswitch is switched on. The liquid level sensor 20 sends a signal to an external device, which warns that the liquid surface WL inside the stormwater drain 100 has reached the hazardous liquid level K1.

By attaching such a liquid level detection unit 1D to the drainage system 100, occurrence of water damage can be detected in advance. According to the liquid level detection unit 1D, the liquid level sensor 20 is housed inside the cover 10D, so that the foreign matter flowing in from the grate 122 can be prevented from adhering to the liquid level sensor 20, and false detection of the liquid level reaching the hazardous liquid level K1 can be avoided sensors, if inflowing water causes the level sensor 20 to vibrate unintentionally, can be avoided with certainty. By means of the cover 10D, the liquid level sensor 20 can detect the hazardous liquid level K1 based solely on the rising liquid surface WL inside the cover 10D.

The distance d2 between the side walls 12D, 13D on the short-axis side is set by the cover 10D in such a way that the liquid level sensor 20 is only permitted to float along the long axis La. That is, by the cover 10D, the direction in which the liquid level sensor 20 floats is restricted to only the direction along the long axis La. In the cover 10D, it is not necessary to provide a space allowing the liquid level sensor 20 to float in the short axis Sa direction, so downsizing of the cover 10D in the short axis Sa direction can be achieved. Thereby, the component cost and the manufacturing cost of the cover 10D can be reduced. Further, the downsizing of the cover 10D increases the degree of freedom in the location where the liquid level detecting unit 1D is installed.

Since the liquid level sensor 20 is fixed to one of the long axis side side walls 14D, the direction in which the liquid level sensor 20 floats can be restricted to a single direction (direction toward the other long axis side side wall 15D). From the viewpoint of downsizing the cover 10D, this is superior to a structure in which e.g. B. the liquid level sensor 20 is installed at an intermediate position with respect to the distance d3 of the pair of long axis side side walls 14D, 15D and the liquid level sensor 20 can float in both directions.

Since the liquid level sensor 20 is suspended in a state where the base end 22 is inclined toward the long-axis side side wall 15D, the liquid level sensor 20 becomes easy to float in the long-axis La direction.

Since the liquid level sensor 20 has a round cross-sectional shape, even if the liquid level sensor 20 contacts the short-axis side side walls 12D, 13D, it is a point contact, so that the movement in the long-axis La direction can be prevented from being disturbed.

Since the holes 16D are provided in the short-axis side side walls 12D, 13D, air entering the cover 10D can be discharged from the cover 10D, so that air accumulation inside the cover 10D can be prevented and the liquid level inside the cover can be prevented 10D unintentionally sinks.

Further, on the upper end wall 11D of the cover 10D, the plurality of ribs 11Da, 11Db extend in a lattice shape in the direction of the short axis Sa and in the direction of the long axis La. This increases the degree of freedom in positioning and orientation when attaching the liquid level detecting unit 1D via the connecting brackets 101 in accordance with the object to which the liquid level detecting unit 1D is attached, such as the lattice shape of the grating 122.

<Other>

For example, in the liquid level detecting unit 1D of the above embodiment, the liquid level sensor 20 was provided on the one long-axis side wall 14D side. On the other hand, the cable 30 may also be fixed to one of the short-axis side side walls 12D, 13D by the fixing member 31 at a middle position with respect to the long-axis La direction. In this case, the cover 10D is designed to have a clearance d3 that allows the liquid level sensor 20 to float in both directions of the long axis La direction.

Further, in the cover 10D, the cross-sectional shape orthogonal to the extending direction is elliptical or substantially elliptical, but it may be rectangular or substantially rectangular. Furthermore, the cover 10D may also be formed of a metal mesh basket as long as the cross-sectional shape orthogonal to the extending direction is the same.

<Fourth embodiment>

Next, a liquid level detecting unit 1E according to a fourth embodiment will be explained. 20 12 are views for explaining the configuration of the liquid level detection unit 1E according to the fourth embodiment, in which (a) is a perspective view and (b) is a front view. The illustration of the power supply device 40 has been omitted. In the following, the parts different from the liquid level detecting unit 1D will be mainly explained, and the same parts as in the liquid level detecting unit 1D will be given the same reference numerals and the explanation thereof will be omitted.

The liquid level detection unit 1E according to the fourth embodiment is exemplified wise used in the same rainwater drain 100 as the liquid level detecting unit 1D. The liquid level detection unit 1E also includes a second float liquid level sensor 50 suspended from one end to the other end of a cover 10E below the liquid level sensor 20 and accommodated in the cover 10E via a cable 60 other than the cable 30, and detects that another specific liquid level K2 below the liquid level detected by the liquid level sensor 20 K1 has been reached.

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

On the upper end wall 11D, a guide 11Ed for guiding the cable 60 on which the liquid level sensor 50 is suspended is formed. The guide 11Ed is provided on the long-axis-side sidewall 15D side on the opposite side to the long-axis-side sidewall 14D in the long axis La direction. The guide 11Ed guides the cable 60 from the outside of the cover 10E to the inside of the accommodating space S. The cable 60 is fixed to the guide 11Ed.

A guide path 17E for guiding the cable 60 is formed on the long-axis side side wall 15D at a position not in contact with the liquid level sensor 20 in the floating state. The long-axis side wall 15D has the guide track 17E running along the extending direction of the cover 10E. The guideway 17E extends over a portion opposed to the liquid level sensor 20. As shown in FIG. The guideway 17E passes the cable 60 which has been guided inside the cover 10E via the guide 11Ed of the upper end wall 11D.

21 (a) is a cross section along a line XXI(a) - XXI(a) in 20 (b) , and shows the floating state of the liquid level sensor 20, and 21(b) is a cross section along a line XXI(b) - XXI(b) in 20 (b) , and shows the floating state of the liquid level sensor 50. The guideway 17E is formed in a central portion of the long-axis side side wall 15D with respect to the short-axis Sa direction. The guideway 17E is a portion where the pitch of the cover 10E is narrowed in the direction of the short axis Sa. A distance d4 from the long-axis side wall 14D to the guide track 17E is set at least greater than a distance (20L + 30L) resulting from the addition of the length 20L of the liquid level sensor 20 to the distance 30L of the cable 30 (d4 > 20L + 30L).

A stopper 18E is provided on the cover 10E. The stopper 18E is provided between the liquid level sensor 20 and the liquid level sensor 50 with respect to the hanging H direction.

The stopper 18E prevents the liquid level sensor 50 from floating to the liquid level sensor 20 side relative to a position corresponding to the liquid level K2.

The stopper 18E is a component formed separately from the cover 10E, which is fixed to at least one of the short-axis side walls 12D, 13D and the long-axis side walls 14D, 15D. The stopper 18E ensures that the liquid level sensor 50 positioned below the liquid level sensor 20 does not float toward the liquid level sensor 20 due to the rise of the liquid surface and impede the movement of the liquid level sensor 20 in the long axis La direction.

The stopper 18E is provided between the liquid level sensor 20 and the second liquid level sensor 50 in the hanging H direction. Concretely, the stopper 18E is provided in the suspension direction H above the liquid level K2, which is the object of detection of the second liquid level sensor 50, and below the lower edge of the moving range of the liquid level sensor 20 on the cover 10E. Further, the stopper 18E is provided closer to the side (upper side) of the liquid level sensor 20 than to the fixing point P2 where the cable 60 is fixed by the fixing member 61 to the long-axis side wall 15D.

The structure of the liquid level sensor 50 is the same as that of the liquid level sensor 20. The structure of the cable 60 is the same as that of the cable 30. The liquid level sensor 50 is accommodated by the cable 60 in a suspended state inside the cover 10E. The liquid level sensor 50 is positioned below the liquid level sensor 20 with respect to the hanging direction H . The liquid level sensor 50 detects the specific liquid level K2 by the fact that it floats on the liquid surface in the cover 10E and it floats up along the long-axis side walls 14D, 15D of the cover 10E when, as a result of the rising liquid level inside the cover 10E, the one with the Cable 60 connected end 51 the other end 52 of the liquid level sensor 50 with respect to the suspension direction H approaches.

With the liquid level sensor 50 housed in the cover 10E, its base end 52 is positioned closer to the upper end wall 11D side than to the other end of the cover 10E on the opposite side from the upper end wall 11D. That is, the level sensor 50 is positioned entirely inside the accommodating space S. FIG.

The cable 60 passes inward from the outside of the cover 10E through the guide 11Ed of the top end wall 11D. The cable 30 is connected to the power supply device 40 provided outside the cover 10E.

The cable 60 runs along the one long-axis side wall 15D. The cable 60 is fixed at a position a certain distance from the liquid level sensor 50 to the one long-axis side wall 15D by the band-shaped fixing member 61 . For example, the cable 60 is fixed to the cover 10E in that two feedthrough holes (not shown) are formed in the long-axis side wall 15D, one end of the band-shaped fastening element 61 is guided through the one feedthrough hole into the interior of the cover 10E, the cable 60 on passes through the long-axis-side side wall 15D side and is guided out of the other through hole to the outside of the cover 10E again.

The cable 60, in which the position where the cable 60 is fixed by the fixing member 61 is assumed to be the fixing point P2, is movably supported toward the long-axis side side wall 14D about this fixing point P2. The cable 60 is movable along the long axis La in a range between the fixed point P2 and the front end 51 of the liquid level sensor 50 . For example, the location of the fixed point P2 can be provided such that the liquid level sensor 50 allows the axis x2 of the liquid level sensor 50 to come into a horizontal state.

The liquid level sensor 50 is in contact with a part of the outer peripheral surface of the long-axis side wall 15D in a state suspended from the cover 10E via the cable 60 . The axis x2 extending from one end 51 to the other end 52 of the liquid level sensor 50 in a state where the liquid level sensor 50 is fixed to the cover 10E is inclined from the long-axis side wall 15D to the long-axis side wall 14D side. The axis x2 of the liquid level sensor 50 recedes from the long-axis side side wall 15D on the base end 52 side with respect to the front end 51 and approaches the long-axis side side wall 14D.

A dimension (L50 + L60) in which a distance from the fixed point P2 of the cable 60 to the front end 51 of the liquid level sensor 50 in a state where the liquid level sensor 50 floats and is inclined to the horizontal has been added to the length 50L of the liquid level sensor 50 , is set smaller than the distance d3 of the pair of long-axis side side walls 14D, 15D.

[Operation of Liquid Level Detecting Unit]

22 are views for explaining the operation of the liquid level detecting unit 1E, (a) is a view showing the initial state of the liquid level sensor 50, (b) is a view showing the state before detection of the liquid level K2, which is a state in which the liquid level sensor 50 floats on the liquid surface WL and is inclined, and (c) is a view showing the state when the liquid surface WL further rises, the liquid level sensor 50 inclines, and the liquid level K2 is detected. The liquid level K2 of the liquid surface, which the liquid level sensor 50 detects, is arbitrarily adjusted starting from the grating 122 of the rainwater drain 100 along the suspension direction H of the liquid level sensor 20 at a point at a certain distance. The liquid level K2 is set at a point below the hazardous liquid level K1.

If, for example, a separate pipe opening (not shown) is provided below the pipe opening 111 of the rainwater drain 100, it may happen that, due to heavy rain, rainwater of an unexpected amount of rain that is larger than that which can flow off in the sewer inside the rainwater drain 100 through the Grating 122 flows into the rainwater drain 100. The water overflowing from the separate piping hole returns inside the rainwater drain 100 . As a result, the liquid surface WL increases inside the main section 110 of the rainwater drain 100 (cf. 22 (a) ).

Due to the increase in the liquid level of the amount of water flowing into the stormwater drain 100, water also enters the inside of the cover 10E from the side opposite to the upper end wall 11D. When the liquid surface WL reaches the base end 52 of the liquid sigkeitsstandsensors 50, the liquid level sensor 50 floats on.

In the cover 10E, the distance d2 between the short-axis side walls 12D, 13D is only slightly larger than the maximum diameter of the liquid level sensor 50. The liquid level sensor 50 does not float in the direction of the short axis Sa or the plumb direction, but toward the long-axis side wall 14D along the direction of the long axis La while inclining along the short axis side side walls 12D, 13D together with the cable 60 (see Fig. 22 (b) ).

With the liquid level sensor 50, the weight is greater than the buoyancy. In the liquid level sensor 50, the center of buoyancy is located on the base end 52 side, and the center of gravity of the liquid level sensor 50 is positioned on the front end 51 side. Therefore, the liquid level sensor 50 develops a torque due to the fact that the center of gravity deviates from the center of buoyancy. In the liquid level sensor 50, due to the generation of the torque, due to the rise of the water surface WL, the front end 51 of the liquid level sensor 50 inclines so that the front end 51 of the liquid level sensor 50 approaches the base end 52 side with respect to the suspension direction H and the axis x2 approaches horizontal or substantially horizontal (cf. 22(c) ).

If the liquid surface WL has reached the liquid level K2, for example the axis x2 of the liquid level sensor 50 reaches the horizontal or essentially horizontal, as a result of which the ball rolls inside and the microswitch is switched on. The liquid level sensor 50 sends a signal to an external device, which warns that the water surface WL inside the stormwater drain 100 has reached the liquid level K2.

Even if the liquid level inside the cover 10E continues to rise, the liquid level sensor 50 is restricted from floating by the stopper 18E. If the liquid surface WL has exceeded the stop 18E, continues to rise and reaches the hazardous liquid level K1, then the liquid level sensor 20 is operated. The operation of the liquid level sensor 20 is the same as that of the first embodiment.

According to such a liquid level detection unit 1E, the liquid levels K1, K2 at two different height positions with respect to the suspension direction H can be detected. For example, in the case where two pipe openings are provided in the height direction in the storm water drain 100, at a stage where the liquid surface WL has reached the liquid level K2 lower than the liquid level K1 before reaching the hazardous liquid level, detected that water is flowing back from the lower pipe opening. As a result, it can be recognized at an early stage that the risk of water overflowing from the rainwater drain 100 increases before the liquid surface WL reaches the hazardous liquid level K1.

In addition, the cover 10E has the guideway 17E so that the cable 60 of the liquid level sensor 50 does not prevent the liquid level sensor 20 from floating.

In addition, the cover 10E has the stopper 18E, so that the liquid level sensor 20 is prevented from being disturbed by the liquid level sensor 50 being floated.

<Other>

For example, the liquid level sensor 50 is provided on the long-axis side wall 15D side opposite to the long-axis side wall 14D side on which the liquid level sensor 20 is provided, but may be provided on the long-axis side wall 14D side.

First to fourth preferred embodiments of the present invention have been explained above, but the present invention is not limited to the above embodiments but includes various aspects included in the gist and claims of the present invention. Furthermore, various features can be selected and combined in a suitable manner in order to bring about at least some of the problems and effects described above. Further, for example, the shape, material, arrangement, size or the like of the respective components in the above four embodiments can be appropriately changed depending on the concrete usage aspect of the present invention.

Reference List

1A, 1B, 1C, 1D, 1E

Liquid Level Detector Unit

10A, 10B

disk unit

10D, 10E

cover (cylindrical component)

11A

mounting plate

11D

Upper end wall

11Da

Short rib (first rib)

11db

Long rib (second rib)

11Dc, 11Ed

guide

12A

carrier plate (carrier)

12D, 13D

Short-axis side wall

13C

extension carrier plate (extension carrier)

14D, 15D

Long axis side wall

13A

angular component

14A

feedthrough hole

15A

feedthrough hole

16A

protruding plate

16D

Hole

17E

guideway

18E

attack

20

liquid level sensor

20L

length

20r

diameter

20R max

Maximum diameter

21

Front End (First End)

22

Base End (Second End)

30

Cable

30L

Distance

31

fastener

40

power supply device

41

Hook

50

Liquid level sensor (second liquid level sensor)

50L

length

51

Front End (First End)

52

Base End (Second End)

60

cable (other cable)

61

fastener

100

Drainage system, rainwater drain

101

connecting clip

110

main section

111

pipe opening

120

inflow section

121

inflow opening

122

grating

la

long axis

sat

Short axis

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• JP 2012026109 A [0004]

Claims (14)

A liquid level detector unit for a drainage system comprising a floating liquid level sensor which is suspended by a cable in a drainage system and detects that a liquid surface has reached a certain liquid level, and a support which runs in the extending direction of the cable in the drainage system and the liquid level sensor via the cable in such a way that the liquid level sensor can be floated, characterized in that when the liquid level sensor is being worn by the wearer, the direction of extension of an axis that runs from one end connected to the cable to the other end on the side remote from the cable is the direction of extension of the cable crosses. Liquid level detector unit for a drainage system claim 1 comprising an extension bracket connected to a lower end of the bracket in the suspension direction of the liquid level sensor, and a second floating liquid level sensor supported on the extension bracket via a cable other than the cable such that the liquid level sensor is floatable, and detects that the liquid surface has reached a certain liquid level below the certain liquid level, characterized in that in the second float liquid level sensor the direction of travel crosses the direction of travel of the cable when carried by the extension support. Liquid level detector unit for a drainage system claim 2 , characterized in that further the bracket and the extension bracket are plate-shaped members, the bracket and/or the extension bracket having a pair of protruding plates projecting to the liquid level sensor side along the respective edges extending in the hanging direction and the second liquid level sensor, the pair of projecting plates being spaced apart such that the liquid level sensor and the second liquid level sensor are allowed to float only in the direction away from the bracket or extension bracket. Liquid level detector unit for a drainage system claim 2 or 3 , characterized in that the support and / or the extension support in the suspension direction of the liquid level sensor and the second liquid level sensor has a plurality of fixing points at which fixing of the cable and the other cable is possible. Liquid level detector unit for a drainage system according to any one of Claims 1 until 4 , characterized in that a fixing part is included, which is fixed to the drainage structure and extends at the upper end of the bracket in the suspension direction of the liquid level sensor from the bracket perpendicularly to the side on which the liquid level sensor is supported. A liquid level detection unit for a drainage system comprising a cylindrical member formed in a cylindrical shape such that a first end is closed and another end is open, having a short axis and a long axis in a cross section orthogonal to the extending direction thereof, and a pair of short-axis side walls , which face each other in the direction of the short axis, and a pair of long-axis side side walls, which face each other in the direction of the long axis, and a float type liquid level sensor suspended by a cable from one end of the cylindrical member to the other end and in the cylinder-shaped member is received, and detects that the liquid surface has reached a certain liquid level, characterized in that the cable on which the liquid level sensor is suspended is fixed to one of the pair of long-axis side side walls, and the axis of the liquid level sensor, which is connected to the one with the cable-connected end of the liquid level sensor to the other end on the opposite side from the cable, from which one of the long-axis side walls is inclined to the side of the other long-axis side walls. Liquid level detector unit for a drainage system claim 6 , characterized in that the distance between the pair of short-axis side walls is adjusted to prevent the liquid level sensor from floating along the short axis, and the distance between the pair of long-axis side walls is adjusted to prevent the liquid level sensor from floating along the long axis and Detecting the specific liquid level is allowed. Liquid level detector unit for a drainage system claim 6 or 7 , characterized in that the cylindrical member has at least one hole on the side of one end with respect to the liquid level sensor in the hanging state of the liquid level sensor. Liquid level detector unit for a drainage system according to any one of Claims 6 until 8th , characterized in that the closed one end of the cylindrical component has at least one first rib, which protrudes along the short-axis side wall to the side facing away from the other end, and at least one second rib, which protrudes along the long-axis side wall to the side facing away from the other end, wherein the at least one first rib and the at least one second rib can carry connecting brackets for connecting the cylindrical member to the drainage system. Liquid level detector unit for a drainage system according to any one of Claims 6 until 9 , characterized in that it further comprises a second float liquid level sensor which is suspended under the liquid level sensor and housed in the cylindrical member via a cable other than the cable from one end of the cylindrical member to the other end, and detects that the second liquid level sensor reaches another specified liquid level below the liquid level detected by the liquid level sensor. Liquid level detector unit for a drainage system claim 10 characterized in that an axis extending from one end of the second liquid level sensor connected to the other cable to the other end on the side opposite to the other cable is inclined from the other long-axis side wall to the one long-axis side wall side. Liquid level detector unit for a drainage system claim 10 or 11 , characterized in that a guide track for guiding the other cable is formed on the other long-axis side wall at a point where there is no contact with the liquid level sensor in the floating state. Liquid level detector unit for a drainage system according to any one of Claims 10 until 12 , characterized in that a stopper is provided on the cylindrical member, which is provided in the suspension direction between the liquid level sensor and the second liquid level sensor, and with respect to a position corresponding to the other predetermined liquid level, floating of the second liquid level sensor to the liquid level sensor side is prevented . Liquid level detector unit for a drainage system according to any one of Claims 1 until 13 , characterized in that the cross-sectional shape of the liquid level sensor, which crosses the axis, has a round shape from one end of the liquid level sensor connected to the cable to the other end remote from the cable.

Images