KR101839992B1 - Apparatus for measuring water level - Google Patents

Abstract

Disclosed is an apparatus for measuring a water level. The apparatus for measuring a water level according to an embodiment of the present invention comprises: a housing installed on an inner wall surface of a water channel; a tubular body provided inside the housing and into which fluid flows; a water level measuring unit provided at one end of the tubular body for measuring a level of the fluid introduced into the inside of the tubular body; a water level indicating unit provided on the outer surface of the housing and indicating the level of the fluid measured in the water level measuring unit; and a malfunction prevention unit for preventing malfunction of the water level measuring unit. The malfunction prevention unit includes a main filter provided on the outer surface of the housing and filtering foreign matters contained in the fluid flowing into the interior of the housing.

Description

[0001] APPARATUS FOR MEASURING WATER LEVEL [0002]

The present invention relates to a level measuring apparatus.

Generally, water level meters are installed near rivers, rivers, reservoirs, and waterways to measure water levels in rivers, rivers, reservoirs, and waterways.

However, since such a water level meter must directly grasp the water level of the fluid through the scale and number of the water level meter, it is difficult to accurately grasp the water level, and it is more difficult to accurately grasp the water level in a harsh environment such as night or rainy weather There is a problem that convenience in use is deteriorated.

On the other hand, in order to solve such a problem, Korean Patent Registration No. 10-0511206 entitled " Apparatus for measuring the mixture level of abnormal flow using ultrasound "has been disclosed. Specifically, the "apparatus for measuring the mixture level of an abnormal flow using ultrasound" in Korean Patent Registration No. 10-0511206 includes an ultrasonic wave reflection signal detector, an ultrasonic velocity calculator, and a water level calculator, The ultrasonic wave velocity calculation unit calculates the velocity of the ultrasonic wave by sensing the temperature and the pressure. The water level calculation unit calculates the reception time of the ultrasonic wave received from the ultrasonic wave reflection signal detection unit, So that the ultrasonic wave velocity is measured.

However, in such a conventional ultrasonic level meter, when bubbles, foreign substances, or the like are present on the water surface or moisture generated from the fluid is adsorbed on the surface of the ultrasonic level sensor, the ultrasonic waves are irregularly reflected and the propagation path of the ultrasonic waves is disturbed, Can not be accurately measured.

Korean Patent Registration No. 10-0511206 (published on Aug. 23, 2005)

Embodiments of the present invention have been proposed in view of the problems of the prior art as described above, and it is an object of the present invention to provide a water level measuring apparatus capable of accurately measuring the level of a fluid, displaying a measured level of the fluid with a high visibility, .

According to an aspect of the present invention, there is provided a method of manufacturing a fluid supply device, comprising: a housing provided on an inner wall surface of a water channel; a tube provided inside the housing and having a fluid inlet therein; And a malfunction prevention unit provided on an outer surface of the housing for indicating a level of the fluid measured by the level measuring unit and a malfunction prevention unit for preventing malfunction of the level measuring unit And the malfunction prevention unit may be provided on the outer surface of the housing and include a main filter for filtering foreign matter contained in the fluid flowing into the interior of the housing.

The malfunction preventing unit may further include an auxiliary filter provided on an outer surface of the tubular body to filter foreign substances contained in the fluid flowing into the tubular body.

The main filter and the auxiliary filter may have a mesh structure, and the mesh size of the auxiliary filter may be smaller than the mesh size of the main filter.

The water level measuring unit may include a mounting member having a structure in which one end is closed and the other end is opened, at least a part of which is inserted into one end of the tubular body, and a mounting member which transmits ultrasound waves toward a water surface inside the tubular body, And a level sensor provided inside the mounting member to receive the ultrasonic waves.

The control unit may further include a control unit for calculating a level of the fluid inside the tubular body based on the measured value of the level sensor.

The level display unit may further include a display plate provided with a plurality of graduations so as to display the level calculated by the control unit and a plurality of light emission units arranged along the plurality of graduations and emitting light according to the water level calculated by the control unit And the control unit can control the on / off state of the light emitting diodes arranged in the scale corresponding to the water level calculated in the control unit among the plurality of scales.

The malfunction prevention unit may further include a first air nozzle provided on an inner surface of the tubular body for jetting air toward the fluid inside the tubular body and a second air nozzle provided on an inner surface of the mounting member, And a second air nozzle for spraying the second air nozzle.

The first guide portion may include a first guide groove formed in one of an inner wall surface of the channel and the housing, and a second guide groove formed in one of the inner wall surface of the channel and the housing, And a first guide protrusion provided on the inner wall surface of the water channel and the other one of the housings and engaged with the first guide groove.

And a second guide portion for guiding the movement of the tubular body to the inner wall surface of the water channel, wherein the second guide portion includes a second guide groove provided on any one of the inner wall surface of the water channel and the tube, And a second guide protrusion provided on the other of the inner wall surface of the channel and the tube, and engaged with the second guide groove.

The apparatus may further include a third guide portion for guiding movement of the tubular body relative to the housing, wherein the third guide portion includes a third guide groove provided in the housing and a third guide groove provided in the tubular body, And a third guide protrusion configured to move along the third guide groove.

The housing may include a first housing disposed on one side of the tube and a second housing disposed on the other side of the tube, and the first guide may be provided independently of the first housing and the second housing .

The level measuring apparatus according to one embodiment of the present invention can accurately measure the level of the fluid and the level of the measured fluid is displayed with high visibility so that convenience in use can be increased.

1 is a perspective view showing a state in which a water level measuring apparatus according to an embodiment of the present invention is installed on an inner wall surface of a water channel.
Fig. 2 is a perspective view showing the water level measuring apparatus of Fig. 1;
3 is an exploded perspective view showing the level measuring apparatus of FIG.
4 is a perspective view showing the housing in the level gauge of FIG.
5 is a perspective view showing a pipe body in the water level measuring apparatus of FIG.
6 is a cross-sectional view taken along line AA of FIG.
7 is a perspective view showing a state in which a water level measuring apparatus according to another embodiment of the present invention is installed on an inner wall surface of a water channel.
Fig. 8 is an exploded perspective view showing the coupling relationship between the water level measuring apparatus of Fig. 7 and the inner wall surface of the water channel.
FIG. 9 is an exploded perspective view showing the level measuring apparatus of FIG. 7; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, configurations and operations according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description may form part of the detailed description of the invention.

However, the detailed description of known configurations or functions in describing the present invention may be omitted for clarity.

While the invention is susceptible to various modifications and its various embodiments, it is intended to illustrate the specific embodiments and the detailed description. It should be understood, however, that the invention is not intended to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals such as first, second, etc. may be used to describe various elements, but the elements are not limited by such terms. These terms are used only to distinguish one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

Hereinafter, a case where the present invention is installed on the inner wall surface of the water channel 20 of the water level measuring apparatus 10 according to an embodiment to measure the level of the fluid in the water channel will be described as an example, The present invention is applicable not only to the water channel but also to a water level measuring apparatus for measuring the level of fluid such as a river, a river, a reservoir, and a fluid storage vessel.

FIG. 1 is a perspective view showing a water level measuring apparatus according to an embodiment of the present invention installed on an inner wall surface of a water channel, FIG. 2 is a perspective view showing a water level measuring apparatus of FIG. 1, Fig. 4 is a perspective view showing a housing in the water level measuring apparatus of Fig. 1, Fig. 5 is a perspective view showing a pipe body in the water level measuring apparatus of Fig. 1, and Fig. 6 is a sectional view along AA of Fig.

1 to 6, a water level measuring apparatus 10 according to an embodiment of the present invention includes a housing 100, a body 200, a water level measuring unit 300, a control unit 400, (500) and a malfunction prevention unit (600).

The housing 100 may be provided to be installed on the inner wall surface of the water channel 20. The housing 100 may include a housing main body 110, a tubular insertion portion 120, and a main filter insertion portion 130.

The housing main body 110 can be fastened to the inner wall surface of the water channel 20. For example, the housing main body 110 may be fastened to the inner wall surface of the water channel 20 by a bolt-fastening method, but the spirit of the present invention is not limited thereto, and the housing main body 110 may be fastened to the inner wall surface Various fastening methods can be applied.

The tubular inserting portion 120 may be provided for inserting the tubular body 200 and extend along the height direction of the housing main body 110. Here, the "height direction of the housing main body 110" means the y-axis direction in Fig.

The main filter insertion unit 130 may be provided for inserting the main filter 610 of the malfunction prevention unit 600 and may be provided on the outer surface of the housing main body 110. [

The tubular body 200 may be provided inside the housing main body 110. Since the tubular body 200 is provided inside the housing body 110, the surface of the fluid introduced into the tubular body 200 can be uniform.

The tubular body 200 may include a tubular body 210, a mounting member insertion portion 220, and an auxiliary filter insertion portion 230.

The tubular body 210 defines a measurement area required for measuring the level of the fluid, and may be inserted into the tubular insertion portion 120 of the housing 100.

The mounting member inserting portion 220 may be provided for inserting a level measuring unit 300 to be described later. The mounting member insertion portion 220 may be formed to have a hole shape on the upper surface of the tubular body 210.

The auxiliary filter inserting unit 230 may be provided to insert an auxiliary filter 620 of a malfunction prevention unit 600 to be described later and may be provided on at least one outer surface of the tubular body 210.

The level measuring unit 300 may be provided at one end of the tubular body 200 to measure the level of the fluid introduced into the tubular body 200. The level measuring unit 300 may include a mounting member 310 and a level sensor 320.

The mounting member 310 may be provided to protect the level sensor 320 from the fluid. The mounting member 310 may be at least partially inserted into the mounting member insertion portion 220 of the tube 200 and may have a structure in which one end is closed and the other end is opened.

The level sensor 320 may be installed inside the mounting member 310 to emit ultrasonic waves toward the water surface of the fluid introduced into the tube 200 and to receive ultrasonic waves reflected from the water surface.

On the other hand, the measured value measured by the water level measuring unit 300 may be transmitted to the control unit 400. The control unit 400 may be configured to calculate the level of the fluid inside the tube 200 based on the measured value of the level sensor 320. For example, the control unit 400 detects the point of time when the ultrasonic wave is transmitted from the level sensor 320 and the point of time when the ultrasonic wave is received by the level sensor 320, Can be calculated. By considering the distance between the bottom surface of the tube 200 and the level sensor 320 and the total traveling distance of the ultrasonic waves, the total travel distance of the ultrasonic waves can be calculated by multiplying the calculated required time by the speed of the ultrasonic waves. The level of the fluid can be calculated.

The level of the fluid thus calculated can be transmitted to the water level indicator unit 500 through any kind of wireless network such as a wired network such as a local area network, a wide area network, or a value added network, or a mobile communication network or a satellite communication network.

The water level indicating unit 500 can visually display the level of the fluid calculated in the control unit 400. [

To this end, the water level indicating unit 500 may be provided on the outer surface of the housing 100, and may include a display plate 510 and a plurality of light emitting diodes 520.

The display plate 510 may include a plurality of graduations 511 for indicating the level of the fluid. The plurality of scales 511 may extend along the width direction of the display plate 510 and be spaced apart from each other by a predetermined distance along the height direction of the display plate 510. Here, the "width direction of the display plate 510" means the x-axis direction of Fig. 2, and the "height direction of the display plate 510"

The plurality of light emitting diodes 520 may be arranged in line along the scale 511 and may be turned on and off by the control unit 400. For example, the light emitting diode 520 disposed in the scale 511 corresponding to the level of the fluid calculated in the control unit 400 among the plurality of scales 511 can be emitted by the control unit 400. [

The display plate 510 and the light emitting diode 520 may be waterproofed by a known waterproofing method so that the display plate 510 and the light emitting diode 520 are corroded or shorted by short- Can be prevented.

As described above, since the water level measuring unit 300 measures the water level by measuring and converting the time when the ultrasonic waves emitted in the water surface direction are reflected from the water surface and returns, the surface state of the fluid to which the ultrasonic waves are reflected is very high It is important. However, when bubbles or foreign substances are present on the water surface, there is a problem that ultrasonic waves are irregularly reflected and the level of the fluid can not be accurately measured.

In addition, when the level measuring unit 300 is continuously used, the moisture of the fluid is adsorbed on the surface of the level sensor 320, and as the moisture interferes with the progress of the ultrasonic wave, the level sensor 320 malfunctions .

Accordingly, the water level measuring apparatus 10 according to the embodiment of the present invention may include a malfunction prevention unit 600 for preventing malfunction of the water level measuring unit 300.

The malfunction preventing unit 600 may include a main filter 610 and an auxiliary filter 620.

The main filter 610 may be detachably attached to the housing main body 110 of the housing 100 to filter foreign substances contained in the fluid flowing into the housing 100.

In addition, the main filter 610 may have a mesh structure of a mesh having a first size (a). Thus, the main filter 610 may be configured to pass the fluid, but filter out foreign matter having a size larger than the first size a included in the fluid.

The auxiliary filter 620 may be detachably attached to the auxiliary filter insertion portion 230 of the tube 200 to filter foreign substances contained in the fluid flowing into the tube 200.

The auxiliary filter 620 may have a mesh structure of a mesh having a second size b smaller than the first size a. Accordingly, the auxiliary filter 620 can be configured to filter foreign matter having a size larger than the second size b included in the fluid while passing the fluid. Thereby, the foreign matter of small particle which can not be filtered by the main filter 610 by the auxiliary filter 620 can be filtered once again.

Meanwhile, the malfunction prevention unit 600 may further include a first air nozzle 630 and a second air nozzle 640.

The first air nozzle 630 may be installed on the inner surface of the tube 200 to inject air toward the fluid inside the tube 200. The first air nozzle 630 receives air from an air supply device (not shown) through the control of the control unit 400 and injects air toward the fluid inside the tubular body 200, Can be removed.

The second air nozzle 640 may be installed on the inner surface of the mounting member 310 to inject air toward the level sensor 320. The second air nozzle 640 receives air from the air supply device under the control of the control unit 400 and injects the air toward the level sensor 320 so that the moisture adsorbed on the surface of the level sensor 320 Can be removed.

The water level measuring apparatus 10 according to the present invention as described above is characterized in that the measuring area for measuring the water level is limited by the tubular body 200 and the outside of the tubular body 200 is divided into the inside of the tubular body 200 Since the fluid inside the tube 200 has a uniform surface state since it is not propagated, precise water level measurement is possible.

The foreign matter contained in the fluid of the channel is primarily filtered by the main filter 610 and filtered by the auxiliary filter 620 so that foreign matter can be prevented from being introduced into the inside of the tube 200 have. Thus, the phenomenon that the ultrasonic wave is irregularly reflected by the foreign substance can be prevented.

In addition, even if bubbles exist in the fluid flowing into the inside of the tube 200, such bubbles are removed by the first air nozzle 630, so that the phenomenon that the ultrasonic waves are irregularly reflected by the bubbles can be prevented.

In addition, when moisture due to fluid is adsorbed on the surface of the level sensor 320, such moisture is removed by the second air nozzle 640, so that malfunction of the level sensor 320 due to such moisture can be reduced .

In addition, since the level of the fluid is visually displayed by the light emitting diode 520, visibility of the level of the fluid is ensured even at night or in the rainy season, so that convenience in use can be achieved.

Hereinafter, a water level measuring apparatus 10 according to another embodiment of the present invention will be described with reference to Figs. 7 to 9. Fig. FIG. 7 is a perspective view showing a water level measuring apparatus according to another embodiment of the present invention installed on an inner wall surface of a waterway, FIG. 8 is an exploded perspective view showing a connection relationship between the water level measuring apparatus of FIG. 7 and an inner wall surface of a waterway, FIG. 9 is an exploded perspective view showing the level measuring apparatus of FIG. 7; FIG.

7 to 9, a water level measuring apparatus 10 according to another embodiment of the present invention includes a housing 100, a tube 200, a water level measuring unit 300, a control unit 400, A malfunction prevention unit 600, a first guide unit 700, a second guide unit 800, and a third guide unit 900. The first guide unit 700, the second guide unit 800, 7 to 9, except for the housing 100, the first guide part 700, the second guide part 800 and the third guide part 900, the water level measuring device 10 shown in Figs. The first guide unit 700, the second guide unit 800, and the third guide unit 900, which are different from the first guide unit 700, the second guide unit 800, and the third guide unit 900, will be described below And the description of the above-mentioned embodiment and the reference numerals will be used for the same part.

Referring to FIGS. 7-9, the housing 100 may include a first housing 101 and a second housing 102.

The first housing 101 may be disposed on one side of the tube 200. The first housing 101 may be slidably engaged with the inner wall surface of the channel 20 and one side of the tube 200.

Meanwhile, the first housing 101 may be provided with a first handle 140. The first handle 140 is gripped by an operator and is configured to engage the first housing 101 with the inner wall surface of the water channel 20 and one side surface of the tube 200 or with the inner wall surface of the water channel 20, May be provided for separating from one side of the tube 200.

The second housing 102 may be disposed on the other side of the tube 200. The second housing 102 can be slidably engaged with the inner wall surface of the water channel 20 and the other side surface of the tube 200.

Meanwhile, the second housing 102 may be provided with a second handle 150. The second handle 150 is gripped by the operator so that the second housing 102 is engaged with the inner wall surface of the water channel 20 and the other side surface of the tube 200 or the inner wall surface of the water channel 20 and the tube 200 from the other side.

The first guide portion 700 can guide the movement of the housing 100 to the inner wall surface of the water channel 20. [ The first guide portion 700 may include a first guide groove 710 and a first guide protrusion 720.

The first guide groove 710 may be provided on the inner wall surface of the water channel 20. The first guide groove 710 may extend along the height direction of the inner wall surface of the water channel 20. Here, the "height direction of the inner wall surface of the channel 20" means the y-axis direction in Fig.

The first guide protrusion 720 may be provided in the first housing 101 and the second housing 102. The first guide protrusion 720 is engaged with the first guide groove 710 to connect the first housing 101 and the second housing 102 to the first and second housings 101 and 102, The sliding movement of the housing 102 can be guided.

The first guide groove 710 is provided on the inner wall surface of the channel 20 and the first guide protrusion 720 is provided on the first housing 101 and the second housing 102 The present invention is not limited thereto. For example, the first guide groove 710 may be provided in the first housing 101 and the second housing 102, and the first guide protrusion 720 may be provided in the inner wall surface of the water channel 20.

The second guide portion 800 can guide the movement of the tube 200 to the inner wall surface of the channel. The second guide portion 800 may include a second guide groove 810 and a second guide protrusion 820.

The second guide groove 810 may be provided on the inner wall surface of the water channel 20. The second guide groove 810 may extend along the height direction of the inner wall surface of the channel 20. Here, the "height direction of the inner wall surface of the channel 20" means the y-axis direction in Fig.

The second guide protrusion 820 may be provided on the tube 200. The second guide protrusion 820 is engaged with the second guide groove 810 to guide the sliding movement of the tubular body 200 for installing the tubular body 200 on the water channel 20.

In the above description, the second guide groove 810 is provided on the inner wall surface of the channel 20, and the second guide projection 820 is provided on the tube 200. However, The scope of the invention is not limited thereto. For example, the second guide groove 810 may be provided on the tube 200, and the second guide protrusion 820 may be provided on the inner wall surface of the water channel 20.

The third guide unit 900 can guide the movement of the tubular body 200 relative to the housing 100. The third guide portion 900 may include a third guide groove 910 and a third guide protrusion 920.

The third guide groove 910 may be formed in the first housing 101 and the second housing 102 and extend along the height direction of the first housing 101 and the second housing 102 . At this time, "the height direction of the first housing 101 and the second housing 102" means the y-axis direction of Fig.

The third guide protrusion 920 may be provided in the tube 200. The third guide projection 920 may extend to one point in the height direction of the tube 200. At this time, the "height direction of the tube 200" means the y-axis direction of Fig. The third guide protrusion 920 is engaged with the third guide groove 910 to guide the fastening of the first housing 101 and the second housing 102 to the tube 200. The auxiliary filter insertion portion 230 may be formed on the lower side of the third guide projection 920.

Meanwhile, the tubular body 200 may include a third handle 240. The third handle 240 is gripped by the operator and receives an external force so that the tube 200 is coupled to the inner wall surface of the water channel 20, the first housing 101 and the second housing 102, The inner wall surface of the first housing 101 and the inner wall surface of the second housing 102, respectively.

The water level measuring apparatus 10 according to the embodiments of the present invention as described above is constructed such that the first housing 101, the second housing 102 and the body 200 are detachably attached to the inner wall surface of the water channel 20 It is easy to replace and maintain the first housing 101, the second housing 102, the tube 200, the main filter 610, and the auxiliary filter 620.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. For example, a person skilled in the art can change the material, size and the like of each constituent element depending on the application field or can combine or substitute the embodiments in a form not clearly disclosed in the embodiments of the present invention, Of the range. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and that such modified embodiments are included in the technical idea described in the claims of the present invention.

10: Level gauge 20: Water channel
100: housing 101: first housing
102: second housing 110: housing body
120: tube insertion part 130: main filter insertion part
140: first handle 150: second handle
200: tubular body 210: tubular body
220: mounting member inserting portion 230: auxiliary filter inserting portion
240: Third handle 300: Water level measuring unit
310: mounting member 320: level sensor
400: control unit 500: water level indicator unit
510: display plate 511: scale
520: Light emitting diode 600: Malfunction prevention unit
610: Main filter 620: Secondary filter
630: first air nozzle 640: second air nozzle
700: first guide part 710: first guide groove
720: first guide projection 800: second guide part
810: second guide groove 820: second guide projection
900: third guide portion 910: third guide groove
920: Third guide projection

Claims (11)

A housing installed on an inner wall surface of the water channel;
A tubular body provided inside the housing and having a fluid therein;
A water level measuring unit provided at one end of the tubular body and measuring a level of the fluid introduced into the tubular body;
A water level indicating unit provided on an outer surface of the housing, for indicating a water level of the fluid measured by the water level measuring unit; And
And a malfunction prevention unit for preventing malfunction of the level measuring unit,
In the malfunction prevention unit,
And a main filter provided on an outer surface of the housing for filtering foreign substances contained in the fluid flowing into the interior of the housing,
Level measuring device. The method according to claim 1,
In the malfunction prevention unit,
Further comprising an auxiliary filter provided on the outer surface of the tubular body for filtering foreign matter contained in the fluid flowing into the interior of the tubular body,
Level measuring device. 3. The method of claim 2,
Wherein the main filter and the auxiliary filter have a mesh structure,
Wherein the mesh size of the auxiliary filter is smaller than the mesh size of the main filter,
Level measuring device. The method according to claim 1,
The level measuring unit includes:
A mounting member having a structure in which one end is closed and the other end is opened, at least a part of which is inserted into one end of the tubular body; And
And a level sensor provided inside the mounting member to emit ultrasonic waves toward the water surface inside the tubular body and to receive ultrasonic waves reflected from the water surface,
Level measuring device. 5. The method of claim 4,
Further comprising a control unit for calculating a level of the fluid inside the tubular body based on the measured value of the level sensor,
Level measuring device. 6. The method of claim 5,
The water level indicating unit
A display plate having a plurality of graduations to display a water level calculated by the control unit; And
And a plurality of light emitting diodes disposed along the plurality of scales and emitting light according to the water level calculated by the control unit,
The control unit
Off of the light emitting diodes arranged in a scale corresponding to the water level calculated by the control unit among the plurality of scales,
Level measuring device. 5. The method of claim 4,
In the malfunction prevention unit,
A first air nozzle installed on an inner surface of the tubular body for jetting air toward a fluid inside the tubular body; And
Further comprising a second air nozzle mounted on an inner surface of the mounting member for spraying air toward the level sensor,
Level measuring device. A first housing and a second housing provided on an inner wall surface of the water channel;
A tubular body coupled to the housing and having a fluid inlet therein;
A water level measuring unit provided at one end of the tubular body and measuring a level of the fluid introduced into the tubular body;
A water level indicating unit provided on an outer surface of the tubular body, for indicating a level of the fluid measured by the water level measuring unit;
A malfunction preventing unit for preventing a malfunction of the level measuring unit; And
And a first guide portion for guiding movement of the housing with respect to an inner wall surface of the water channel,
In the malfunction prevention unit,
And a plurality of fluid passages provided on the outer surface of the housing,
And a main filter for filtering the contained foreign matter,
The first guide portion
A first guide groove formed on one of the inner wall surface of the water channel and the housing; And
A first guide protrusion provided on an inner wall surface of the water channel and the other one of the housings and engaged with the first guide groove,
Level measuring device. 9. The method of claim 8,
Further comprising a second guide portion for guiding movement of the tube relative to an inner wall surface of the water channel,
Wherein the tubular body is configured to be engageable with the inner wall surface of the water channel,
The second guide portion
A second guide groove provided on any one of the inner wall surface of the channel and the tube; And
And a second guide protrusion provided on the other of the inner wall surface of the water channel and the tube and being engaged with the second guide groove,
Level measuring device. 10. The method of claim 9,
Further comprising a third guide portion for guiding movement of the tubular body with respect to the housing,
The third guide portion
A third guide groove provided in the housing; And
And a third guide protrusion provided on the tube and configured to be engaged with the third guide groove and move along the third guide groove,
Level measuring device. 9. The method of claim 8,
Wherein the first and second housings comprise:
A first housing disposed on one side of the tubular body; And
And a second housing disposed on the other side of the tubular body,
Wherein the first guide portion is provided independently to the first housing and the second housing,
Level measuring device.

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