KR20090032348A - Water level sensor - Google Patents

Abstract

A water level sensor for detecting a water level is disclosed. The disclosed invention has an insert that is hermetically fixed to a wall of a water tank, the stem extending from the insert and having a space formed therein, which is provided inside the stem and is rotatably coupled to a stem and a magnetic sensor for detecting a change in magnetic force. It includes a plotter that is rotated to approach or away from the front end, and is provided with a magnet for generating a change in magnetic force with respect to the magnetic sensor. The invention is such that the floater is rotated according to the water level inside the tank, and the magnet of the plotter is approached to the magnetic sensor, thereby making it easy to detect the water level by the magnetic sensor, providing a compact operating range of the floater, and any position of the tank. The plotter can also be easily operated to obtain the benefits of easy placement in the bath.

Description

Water level sensor {WATER LEVEL SENSOR}

The present invention relates to a water level sensor, and more particularly, to a water level sensor for informing the change of the water level so that the water level changes in the inside of the tank can be seen from the outside.

In general, the water level sensor provided in the water tank to detect the water level is a magnetic sensor (lead switch, MR sensor, Hall sensor) inside the stem to guide the magnet and the inside of the bowl using a rectangular bowl or a circular bowl shape To detect the water level in the tank.

In other words, the beret is slidingly coupled to the stem, and is guided by the stem and flows up and down according to the water level of the tank. The magnet inside the beret causes a change in the magnetic field of the magnetic sensor in the stem. Flows or the voltage of the magnetic sensor is changed to detect the water level in the tank.

At this time, the causes of the defective phenomenon of the water level sensor are as follows. First, the detection failure of the water level sensor will be described. There are two main causes of detection failure. That is, the damage of the ferrite magnet and the damage of the reed switch due to the impact on the transportation and assembly process. Here, the breakage of the reed switch is caused by the impact, the irrational soldering process, the structure of the reed switch which is easily broken by the impact, and the mounting structure of the reed switch.

And, the breakage of the magnet is easily caused by the impact using a low-cost ferrite magnet. In addition, when a magnet with fine cracks is put into the process, cracks are enlarged during transportation and assembly of parts, causing damage.

The breakage of the reed switch is a breakage of the glass tube due to the impact, and if it is assembled in a state where a crack has occurred in the glass tube, no defect occurs during the inspection process or initial use of the product, but as time passes, inert gas in the glass tube leaks out. Corrosion of the internal terminals can cause detection failure due to short or deformation.

And, in the soldering process, the reed switch is a temperature sensitive component and requires great care when soldering. In general, soldering of a reed switch should be performed within 2 seconds at a temperature of 220 ° C. so that a defect does not occur. However, current reed switches are soldered manually by all types, and therefore the soldering temperature and time of the reed switches are not accurately observed.

In this case, defects are very likely to occur depending on soldering temperature, soldering time, operator's skill and working environment. In addition, if the temperature is excessively long during the brushing operation, the terminal of the reed switch may be pressed or plastic deformation may occur, thereby causing a defect.

In addition, the glass tube-type reed switch is very weak to shock, there is a root cause difficult to manage. In particular, when the working environment is poor, there is always a problem about quality due to impact or process problems.

In the structure of the reed switch, the 1-stage water level sensor is a structure in which a wire is connected to a switch without a separate PCB and then inserted into a stem. The reed switch is fixed with an epoxy mold. In this case, since the operation is performed without a separate guide and PCB, the positional deviation of the switch is large, and the breakage of the wire soldering portion or the glass tube breakage may occur during the insertion process of the reed switch.

In addition, the cause of the malfunction of the bure in the operation of the bure is caused by the biofilm. The bure and stem are made of lubricating acetal (POM) material and operate with the minimum friction area through the guide of the stem. (Burr), warpage or foreign matters caused by foreign matter.

In addition, the main cause of the failure of the fixing part in the failure of the fixing part of the reed switch is caused by the carelessness of the operator, which is a form that is damaged by giving a very strong impact during the cleaning of the main tank in which the reed switch is disposed.

On the other hand, the conventional water level sensor having a rectangular beret provides an operation method in which the operation of the beret is up and down along the water level, so that it can be attached only to the side or bottom of the tank, thereby limiting the position when placed on the inner wall of the tank. there was.

The present invention has been made to solve the above-mentioned problems of the prior art, and provides a water level sensor to improve the quality by fundamentally eliminating the cause of the failure of the conventional water level sensor, to provide flexibility in the operation of the arrangement inside the tank It is to provide a water level sensor provided.

The configuration of the water level sensor according to the present invention includes an insert that is hermetically fixed to the inner surface of the water tank, the stem extending from the insert portion is formed in the interior, the inside of the stem to detect a change in magnetic force And a plotter rotatably coupled to a sensor and the stem, the magnet being rotated to approach or move away from the tip of the stem and generate a change in magnetic force for the magnetic sensor.

Here, the insert portion of the stem includes an annular flange supported on the outer surface portion of the hole formed on the inner surface to easily fix the insert portion to the inner surface and a packing fitted to the insert portion and supported by the annular flange to be in close contact with the inner surface. do.

The insert may include a plurality of inserts that can be elastically changed in diameter while being inserted into the inner surface, and the inserts may include hooks to prevent separation from the inner surface.

In addition, a printed circuit board for supplying power to the magnetic sensor and providing the magnetic sensor in a surface mount method should be disposed in the space of the stem.

In addition, the space of the stem may be filled with an epoxy that protects the printed circuit board from impact.

The magnetic sensor may be any one of a reed switch, an MR sensor, and a hall sensor, and the magnet may be an ND magnet.

In addition, both sides of the plotter is formed with a rotating plate extending to both sides of the stem to be rotated to be coupled to both sides of the stem, the rotating plate is coupled to the rotating pin inserted through the rotating plate to the stem.

The floater is formed such that the rotating plate extends to both sides of the stem, and provides buoyancy in a water tank, and a buoyancy body on which one side of the magnet restrains the buoyancy body and the upper surface of the buoyancy body is sealed and the magnet It includes a cover plate for pressing and fixing.

The water level sensor according to the present invention configured as described above can fundamentally eliminate the cause of the defect of the water level sensor and reduce the cost, it is easy to determine the placement position in the water tank, especially applicable to the tank built-in structure such as bidet In the case of rectangular bures, it can be applied immediately to the current mass production.

Hereinafter, a preferred embodiment of a water level sensor according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

In addition, the following examples are not intended to limit the scope of the present invention but merely presented by way of example, and there may be various embodiments implemented through the present invention.

Example

1 is a perspective view of a water level sensor according to an embodiment of the present invention, Figure 2 is a longitudinal cross-sectional view of Figure 1, Figure 3 is a functional diagram of FIG.

As shown in Figures 1 to 3, the water level sensor according to an embodiment of the present invention has an insertion portion 105 is fixed to the inner surface of the tank, extends from the insertion portion 105 and therein A space is formed in the stem 100 and the magnetic sensor 110 and the stem 100 that are provided inside the stem 100 to detect a change in magnetic force, so as to approach or move away from the tip of the stem 100. It is rotated and includes a plotter 120 having a magnet 122 for generating a change in magnetic force for the magnetic sensor 110.

At this time, the stem 100 is fixed to the inner surface of the tank and the airtightness is maintained with respect to the coupling portion of the plotter 120 to prevent the penetration of water into the inside, the portion of the insert portion 105 is fixed on the inner surface of the tank However, it should be kept confidential to prevent the leakage of water.

Here, the insert portion 105 of the stem 100 is fixed to one inner wall of the tank so that the water level is sensed so that the water floats in the tank while the plotter 120 is rotated downward from the tip of the stem 100. When the plotter 120 is rotated upward toward the upper end of the stem 100, the magnet 122 in the plotter 120 approaches the magnetic sensor 110 to induce a change in the magnetic force, the magnetic sensor 110 Detection of the magnetic force change by the) is made by being transmitted to the outside through the magnetic sensor (110).

In addition, the insert portion 105 of the stem 100 has an annular flange 106 and an insert portion 105 supported on an outer surface portion of a hole formed in the inner surface to easily fix the insert portion 105 to the inner surface of the tank. And a packing 107 fitted and supported by the annular flange 106 to be in close contact with the inner surface of the bath.

And, the inserting portion 105 is inserted into the inner surface and has a plurality of inserts 108 that can be changed elastically elastically, the insert 108 is inserted by having a hook 109 to prevent separation from the inner surface The assembly 108 provides an advantage of ease of assembly compared to when assembled by bolts or nuts on the outside of the inner surface.

In addition, a printed circuit board 112 may be disposed in the space of the stem 100 to supply power to the magnetic sensor 110 and to connect the magnetic sensor 110 in a surface mount manner.

At this time, the magnetic sensor 110 is disposed in the space of the stem 100 fixed to the elongated printed circuit board 112, which is easily inserted into the space of the stem 100, so that the inside of the stem 100 is easy. It may be stably arranged, and may be operated by receiving power through the printed circuit board 112 after the printed circuit board 112 is disposed inside the stem 100.

In addition, the remaining space of the stem 100 on which the printed circuit board 112 is disposed is filled with an epoxy 123 that protects the impact from the impact while fixing the printed circuit board 112. In the interior of the stably disposed without a separate fixing means, the magnetic sensor 110 can be stably operated on the printed circuit board (112).

Meanwhile, the magnetic sensor 110 may be any one of a reed switch, an MR sensor, and a hall sensor, which may be selectively disposed in a space of the stem 100 disposed on different printed circuit boards 112, and may include a magnet ( 122 provides a more robust structure than the conventional ferrite magnet 122, providing compact and strong magnetic force without being easily damaged from the ignition impact, and making the weight less than the ferrite magnet 122, thereby improving the buoyancy of the plotter 120. It may be a nidiom (ND) magnet 122.

In addition, both sides of the plotter 120 is formed with a rotating plate 125 which extends to both sides of the stem 100 so as to be rotatably coupled to both sides of the stem 100, and the rotating plate 125 penetrates the rotating plate 125. As the rotation pin 126 inserted into the 100 is coupled, the rotation plate 125 may be rotated along a curved path by buoyancy of water in the tank at the tip of the stem 100, and the magnet 122 of the plotter 120 may be rotated. ) Becomes close to the magnetic sensor 110 of the stem 100, the water level of the tank can be detected by the magnetic sensor (110).

In addition, the plotter 120 has a rotating plate 125 is formed to extend to both sides of the stem 100, provides a buoyancy in the tank, the buoyancy body formed on the upper side of the settle groove 124a on which the magnet 122 is constrained. 124 and a cover plate 130 that seals the upper surface of the buoyancy body 124 and pressurizes the magnet 122 to restrain the settled groove 124a.

The water level sensor according to an embodiment as described above is a variety of positions in which the plotter 120 rotates along the curved path is rotatably coupled to the stem 100 so that the plotter 120 can be rotated, such as the side or top surface of the tank. Since it can be selected to provide a flexible selection, the assembly arrangement of the water level sensor for the tank can be more flexible.

Then, the magnetic sensor 110 is fixed to the surface-mounted printed circuit board 112 is assembled to be arranged in the space of the stem 100 to be generated during the assembly process of the magnetic sensor 110 such as a reed switch and a hall sensor. It can be free from damage of the magnetic sensor 110 due to the small impact that can be, in particular, when the reed switch is used as the magnetic sensor 110, the safety of the glass tube of the reed switch can be secured, the mold type reed switch is printed When applied to the circuit board 112, the wire bonding operation is omitted, so that the cause of defects in the assembly process can be essentially eliminated.

1 is a perspective view of a water level sensor according to an embodiment of the present invention.

2 is a longitudinal cross-sectional view of FIG. 1.

3 is a functional diagram of FIG. 1.

<Explanation of symbols on main parts of the drawings>

100: stem 105: insertion part

106: annular flange 107: packing

108: insertion stand 109: hook

110: magnetic sensor 112: printed circuit board

120: plotter 122: magnet

123: epoxy 124: buoyant body

124a: settling groove 125: rotating plate

126: rotation pin 130: cover plate

Claims (9)

A stem having an insert fixed to the wall of the tank, the stem extending from the insert and having a space formed therein; A magnetic sensor provided inside the stem to sense a change in magnetic force; And And a plotter rotatably coupled to the stem to rotate toward or away from the tip of the stem, the plotter being provided with a magnet to generate a change in magnetic force for the magnetic sensor. The method of claim 1, The insert portion of the stem includes an annular flange supported on an outer surface portion of a hole formed in the inner surface to facilitate fixing of the insert portion to an inner surface and a packing fitted to the insert portion and supported by the annular flange to be in close contact with the inner surface. Water level sensor characterized by. The method of claim 1, The insertion part is inserted into the inner surface and having a plurality of inserts that can be changed elastically in diameter, the insert is provided with a water level sensor characterized in that it has a hook to prevent the departure from the inner surface. The method of claim 1, And a printed circuit board for supplying power to the magnetic sensor and providing the magnetic sensor in a surface mount manner in a space of the stem. The method of claim 4, wherein The level sensor is characterized in that the space of the stem is filled with epoxy to protect the impact while fixing the printed circuit board. The method of claim 1, The magnetic sensor is a water level sensor, characterized in that any one of the reed switch, MR sensor or Hall sensor. The method of claim 1, The magnet is a water level sensor, characterized in that the ND magnet. The method of claim 1, Water level sensing, characterized in that the rotating plate is formed on both sides of the plotter extending to both sides of the stem to be coupled to rotate on both sides of the stem, the rotating plate is coupled to the rotating plate inserted into the stem through the rotating plate. sensor. The method of claim 1, The floater is formed so that the rotating plate is extended to both sides of the stem, and provides a buoyancy in the tank, the buoyancy body formed in the upper side of the settled groove in which the magnet is bound; And And a cover plate which seals the upper surface of the buoyancy body and presses and fixes the magnet.

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