KR20110052885A - Sensor for flooding sensing using piezoelectric-element and method for flooding sensing - Google Patents

Abstract

PURPOSE: A flooding detection sensor using a piezoelectric element and a flooding detection method thereof are provided to reduce the manufacturing costs of the sensor by simplifying the structure of the sensor using a piezoelectric element. CONSTITUTION: A flooding detection sensor using a piezoelectric element comprises a case(1), a piezoelectric element(2), an expansion member(3), a load actuating supporter(4), and an output signal cable(5). Multiple through holes(11) are formed on the top of the case. The piezoelectric element is formed on the top of the bottom surface of the case and senses flooding. The expansion member is arranged inside the case and is expanded by inhaling moisture. The load actuating supporter supports the bottom of the expansion member and transfers a load to the piezoelectric element. The output signal cable is connected to the piezoelectric element and transmits the flooding signal.

Description

Sensor for flooding sensing using piezoelectric-element and method for flooding sensing}

The present invention relates to an immersion detection sensor using a piezoelectric element, and more particularly, to sensing a pressure applied to a piezoelectric element and to a response signal according to the indentation for real time immersion according to a voltage signal generated from the piezoelectric element. It relates to a submersion sensor using a piezoelectric element.

In general, piezoelectric elements are referred to as piezoelectric elements, and modifications to crystals such as crystals, roselle salts, and barium titanate generate charges proportional to their forces, and when placed in an electric field, they produce mechanical phenomena. Energy can be converted into electrical energy into mechanical energy, and is widely used in load cells and pressure gauges of industrial appliances such as speakers, cameras, and printers for household appliances.

Looking at the conventional sensor, the registered patent No. 0298183 is a submersion detection sensor using an optical cable, that is, the optical fiber is expanded in the horizontal direction when the water penetrates by inserting the optical fiber in the optical cable. As a result, the optical fiber grating exhibits a strain effect and detects the inundation due to the output wavelength generated. Such a strain effect of the optical fiber grating has a significant effect on the sensitivity, but there is a problem in that the accuracy of the detection of the flooded area and the difficulty of maintaining and repairing the cutting line when replacing the submerged sensor are underground.

In addition, the pre-existing utility model No. 394969 is a submersion sensor installed in the bottom of the place where the inundation is concerned to detect the inundation by the detection rod. When immersion occurs, there is an effect of detecting the immersion even at a long distance using a microcomputer, the volume of the case of the immersion sensor of the present invention occupies a large volume, there was a problem that it is difficult to change the vertical position of the immersion sensor. In addition, when the flow rate of the flooded area is fast, there was a problem that the position of the flooding sensor is changed or not accurately detected.

Accordingly, the present invention was created to solve the above problems, the object of the present invention is as follows.

First, an object of the present invention is to provide a submersion sensor using a piezoelectric element that is easy to manufacture due to its small size and simple configuration.

Second, an object of the present invention is to provide an immersion detection sensor using a piezoelectric element that accurately detects immersion.

Third, an object of the present invention is to provide an immersion detection sensor using a piezoelectric element that is easy to install and replace.

As described above, technical means for achieving the object of the present invention is as follows.

A case of a hexahedron shape having a plurality of penetration holes formed on an upper surface and an outer circumferential surface of the upper portion; A piezoelectric element formed on an upper surface of the case to sense whether the water is submerged; An expansion member provided inside the case and expandable by absorbing moisture; A load action support for transferring a load to the piezoelectric element while supporting the expansion member; And an output signal cable connected to the piezoelectric element and transmitting an immersion signal detected by the piezoelectric element.

The case is formed with a bottom plate to open and close the bottom of the case for replacement of the expansion member, the bottom plate is formed into a sealing portion protruding to be inserted in close contact with the inner bottom of the case, formed in the center of the bottom plate to fix the piezoelectric element The fixing projection is formed, and characterized in that the sealing ring is further provided to seal between the lower inner surface of the case and the sealing portion.

An elastic spring is further provided between the piezoelectric element and the load bearing support.

Between the piezoelectric element and the load acting support is characterized in that it is further provided with a cylindrical load action column for transmitting the load transmitted from the load acting support to the piezoelectric element.

The load action column is characterized by a cone column shape.

The load acting support is further provided with a ring-shaped fixing piece which protrudes at the bottom to fix the elastic spring therein, and is further provided with a cylindrical fixture which protrudes above the load acting column to fix the elastic spring on the outer circumferential surface thereof. do.

The expansion member is characterized in that the swellable fibers.

The load acting support is further provided with a guide surface which is bent by a predetermined height along the outer circumferential surface, and is further provided with a lubricant layer coated on one surface where the guide surface meets the inner surface of the case.

Two or more guide rails are further provided in the height direction of both inner surfaces of the case, and a transfer groove is further provided on an outer circumferential surface of the load acting support at a position corresponding to the guide rail.

And at least one piezoelectric linear motor for adjusting the height of the load bearing support between the bottom plate of the case and the load bearing.

The case is characterized in that the piezoelectric element, the elastic spring and the load action column is provided with two or more.

On the other hand, as a submersion detection method using a submersion detection sensor using a piezoelectric element, installing the submersion detection sensor in the submerged area; When the installed area is flooded, water is supplied to the penetration hole of the case to expand the expansion member; A step in which the load acting support moves the case to one side by the expanded expansion member to contract the elastic spring; When the contraction of the elastic spring is completed, the load of the load acting support is transferred to the load acting column to move the load acting column to one side and press-fit the piezoelectric element; Detecting the degree of pressure applied by the piezoelectric element is characterized in that it comprises the step of outputting the submerged or not signal in the flooded area through the output signal cable.

The installation step may be installed so that the penetration hole of the case is located in the lower part or the penetration hole of the case is located in the upper part according to the inundation area where the immersion detection sensor is installed.

When installing so that the penetration hole of the case is located at the upper part in the installation step, the lower part of the case is buried in the ground to a predetermined depth so that the upper part including the penetration hole of the case protrudes into the ground, or the case is installed so that all of the case is buried except the upper surface in the ground. Characterized in that.

As mentioned above, the effect of this invention is as follows.

First, the present invention by manufacturing the immersion sensor using a piezoelectric element, the size of the immersion sensor is small, the configuration of the immersion sensor is simple and easy to manufacture, and the low cost of manufacturing the immersion sensor There is.

Secondly, the present invention has an effect of accurately detecting the immersion of the installation position by manufacturing the immersion sensor using a piezoelectric element.

Third, the present invention is manufactured by using a piezoelectric element so that the size is small, easy to install the immersion sensor, easy to replace the immersion sensor, and is not limited to the installation space of the immersion sensor It can be installed regardless of up and down position, and it has the effect of high autonomy of installation.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

< In the first embodiment  Configuration according to

1 is a perspective view showing an immersion detection sensor using a piezoelectric element according to a first embodiment of the present invention, Figure 2 is an exploded perspective view showing the immersion detection sensor using a piezoelectric element according to a first embodiment of the present invention 3 is a front sectional view showing an immersion detection sensor using a piezoelectric element according to a first embodiment of the present invention. As shown in Figures 1 to 3, the present invention is installed in the flooded area to detect whether the flooded. To this end, the case 1 is formed in a hexahedral shape and a plurality of penetration holes 11 are formed in the upper surface and the outer peripheral surface of the upper end. At this time, the penetration hole 11 of the case 1 is formed by finishing the heat vertically and horizontally in the upper surface and the outer peripheral surface of the upper end as the water penetrates or may be irregularly formed at any position.

The piezoelectric element 2 is formed on the bottom surface of the case 11. At this time, the piezoelectric element 2 is to detect the immersion. Such a piezoelectric element (2) detects the immersion by indenting the piezoelectric element (2) by using the principle that the volume is increased when the expansion member (3) to be described later in contact with the water.

The expansion member 3 is formed inside the case 1 in which the plurality of penetration holes 11 are formed. The expansion member 3 is preferably formed in the shape of a hexahedron block for ease of installation. In addition, the expansion member 3 is formed so as to point to the portion where the infiltration hole 11 of the case 1 is formed to detect the inundation in a wide range. In addition, it is preferable to use the swellable fiber excellent in the expandability which expands on the absorption surface 3 as the expansion member 3.

The load acting support 4 supports the lower portion of the expansion member 3. At this time, the load action support (4) serves to transfer the load to the piezoelectric element (2) formed on the bottom of the case (1).

The output signal cable 5 is connected to the piezoelectric element 2 and transmits the submerged state signal detected by the piezoelectric element 2.

An elastic spring 6 is installed between the piezoelectric element 2 and the load acting support 4. At this time, the elastic spring (6) is to prevent the expansion member 3 is slightly expanded by moisture to operate the piezoelectric element (2) to prevent the occurrence of the immersion. That is, the elastic spring 6 is compressed to the predetermined range to prevent the pressure due to the expansion of the expansion member 3 from being transmitted to the piezoelectric element 2.

The load action column 7 is formed in a cylindrical shape and is installed between the piezoelectric element 2 and the load action support 4. At this time, the load action column (7) by concentrating the load transmitted from the load action support (4) to the piezoelectric element (2), the piezoelectric element (2) can accurately detect the degree of the load. The cylindrical load action column 7 is further provided. When the elastic spring 6 is installed together with the load action column 7, the elastic spring 6 is preferably formed between the bottom surface of the load action support 4 and the top surface of the load action column 7.

4 is an operating state diagram illustrating an immersion detection sensor using a piezoelectric element according to a first embodiment of the present invention. As shown in FIG. 4, when water penetrates into the penetration hole 11 of the case 1, the expansion member 3 expands to move the load-operating support 4 to one side. It can be seen that when the elastic spring 6 is contracted by the load acting support 4 which is thus moved, the piezoelectric element 2 is press-fitted by the load acting pillar 7.

< In the second embodiment  Configuration according to

5 is an exploded perspective view showing an immersion sensor using a piezoelectric element according to a second embodiment of the present invention, Figure 6 is a front sectional view showing a immersion detection sensor using a piezoelectric element according to a second embodiment of the present invention. to be. 5 and 6, the second embodiment includes the configuration of the first embodiment, the second embodiment, for replacing the expansion member 3 installed inside the case 1, the case ( 1) forms a bottom plate 12 to open and close the lower part of the case 1 for replacement of the expansion member 3, and the bottom plate 12 is inserted into the inner surface of the lower part of the case 1 to close and protrude to close contact. The part 121 is formed. In addition, a plurality of fixing protrusions 122 are formed at the center of the bottom plate 12 to fix the piezoelectric element 2 so that the piezoelectric element 2 is fixed without being shaken at the bottom surface. In addition, a seal ring 123 having an elastic force is formed to seal between the lower inner surface of the opened case 1 and the sealing part 121 so that moisture or moisture is formed in the lower space of the case 1 in which the piezoelectric element 2 is installed. Do not infiltrate. This is to prevent malfunction due to corrosion due to moisture.

Along with this, the load acting support 4 protrudes to the bottom so that the elastic spring 6 is easily shaken or installed during manufacture, thereby forming a ring-shaped fixing piece 41 for fixing the elastic spring 6 therein. do. And the load action column (7) is protruded on the top is formed of a columnar fastener 71 for fixing the elastic spring (6) on the outer peripheral surface. Accordingly, the elastic spring 6 can achieve the above-mentioned shake or installation ease as the elastic spring 6 is fitted and fixed to the fixing piece 41 and the fixing member 71.

With the above configuration, when the expansion member 3 does not expand to a constant volume as a whole, the load acting support 4 may not move in the case 1 and thus may not press-fit the piezoelectric element 2. In addition, in order to prevent the moisture introduced through the penetration hole 11 from penetrating into the space where the piezoelectric element 2 is installed and the piezoelectric element 2 malfunctions, the inner surface of the case 1 and the outer circumferential surface of the load acting support 4 are prevented. This is preferably sealed. To this end, in the present invention, the load acting support 4 forms a guide surface 42 protruding at a right height along the outer circumferential surface so that the load acting support 4 moves vertically from the inner surface of the case 1, and the guide surface ( 42) to form a lubricant layer 44 is applied to one surface that meets the inner surface of the case so that the load acting support 4 moves along the guide surface. The lubricant layer 44 is preferably grease excellent in oil activity and sealing property.

As described above, in order to prevent the expansion member 3 from constantly inflating the volume uniformly so that it is difficult to smoothly move the load acting support 4 to the inner surface of the case 1, the present invention provides a case ( 1) Two or more guide rails 13 are formed in the height direction of both inner surfaces, and a transfer groove 43 is formed on the outer circumferential surface of the load acting support 4 at a position corresponding to the guide rail 13. That is, since the conveying groove 43 of the load acting support 4 is inserted and supported by the guide rail 13 to be transported, the load acting support 4 is in the case 1 even if the expansion member 3 is unbalancedly expanded. It will be possible to move smoothly.

Figure 7 is another embodiment showing a load action column according to a second embodiment of the present invention. As shown in FIG. 7, the load action column 7 may be formed in a conical column shape. This is to form a wide lower portion of the load action column (7) in the same sensing area of the piezoelectric element (2) so that the ease of installation and load is correctly transmitted to the piezoelectric element (2).

< In the third embodiment  Configuration according to

8 is a front sectional view showing an immersion detection sensor using a piezoelectric element according to a third embodiment of the present invention. As shown in FIG. 8, the third embodiment includes a first embodiment and a second embodiment, and the third embodiment includes a bottom plate 12 and a load acting support 4 of a case 1. At least one piezoelectric linear motor 8 for adjusting the height of the load acting support 4 is formed therebetween. This is to fabricate the immersion sensor by operating the piezoelectric linear motor (8) remotely without replacing the expansion member (3) once flooded from the outside. That is, when the piezoelectric linear motor 8 is operated from the outside, the load acting support 4 is raised to press-fit the expanded member 3 that has been expanded to penetrate the moisture absorbed by the expansion member 3 by the penetration hole 11. By discharging back through, it would be possible to reuse the immersion sensor at a remote location without replacing the expansion member 3. Here, it is preferable that a fixing protrusion 122 is formed to fix the piezoelectric linear motor 8 to the bottom plate 12 of the case 1.

< In the fourth embodiment  Configuration according to

9 is a front sectional view showing an immersion detection sensor using a piezoelectric element according to a fourth embodiment of the present invention. As shown in FIG. 9, the fourth embodiment is configured to include the first and second embodiments, and the fourth embodiment is formed at the lower end of the load acting support 4 formed therein. It is provided with a piezoelectric element (2) for detecting the immersion, the elastic spring (6) and the load action column (7) formed so as to accurately detect the immersion. This is to allow the submersion sensor to detect whether the submersion is more accurate.

< Example  Method followed>

10 is a flow chart illustrating a immersion detection method of the immersion detection sensor using a piezoelectric element according to the present invention. As shown in Figure 10, the immersion detection method using the immersion detection sensor using a piezoelectric element according to the present invention, the step (S100) to install the immersion detection sensor in the submersible area, if the installed area is flooded case (1) Moisture is supplied to the penetration hole 11 of the expansion step (3) is expanded (S200), by the expansion member (3) the load acting support (4) by moving the case 1 to one side to elastic In step S300 of contracting the spring 6, when the contraction of the elastic spring 6 is completed, the load of the load acting support 4 is transferred to the load acting column 7 so that the load acting column 7 is moved to one side. The step of moving to press the piezoelectric element (2) (S400) and the piezoelectric element (2) detects the degree of strength of the provided pressure and outputs the immersion in the flooded area to the outside through the output signal cable (5) (S500) )

As described above, when the mechanical energy of the load action column 7 acts on the piezoelectric element 2, the piezoelectric element 2 generates electrical energy in the piezoelectric element 2. The electrical energy generated in this way, that is, whether the immersion signal is output to the outside through the output signal cable 5 in the output step (S500).

11 is a first use state diagram showing the installation method of the immersion sensor using a piezoelectric element according to the present invention, Figure 12 is a second use state diagram showing the installation method of the immersion detection sensor using a piezoelectric element according to the present invention. As shown in FIG. 11, at the same time, in the installation step S100, the infiltration hole 11 of the case 1 is installed at an upper portion according to the inundation area in which the inundation detection sensor is installed or shown in FIG. 12. As described above, the penetration hole 11 of the case 1 may be installed at a lower portion thereof.

13 is a third use state diagram showing the installation method of the immersion sensor using the piezoelectric element according to the present invention, Figure 14 is a fourth use state diagram showing the installation method of the immersion detection sensor using the piezoelectric element according to the present invention. As shown in FIG. 13, in the installation step S100, when the penetration hole 1 of the case 1 is installed at the upper portion, the upper portion including the penetration hole 11 of the case 1 protrudes from the ground. The lower part of (1) is embedded in the ground to a predetermined depth, or as shown in FIG. 14, the case 1 may be installed so that all of the case except the upper surface is embedded in the ground. This is to change the installation position and installation method of the immersion sensor according to the environment of the flooded area.

As described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. It is therefore to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention, and therefore, the present invention is limited only to the matters described in the drawings. It should not be interpreted.

1 is a perspective view showing a submersion sensor using a piezoelectric element according to a first embodiment of the present invention.

Figure 2 is an exploded perspective view showing a submerged sensor using a piezoelectric element according to a first embodiment of the present invention.

Figure 3 is a front sectional view showing an immersion detection sensor using a piezoelectric element according to a first embodiment of the present invention.

Figure 4 is an operating state diagram showing the immersion detection sensor using a piezoelectric element according to a first embodiment of the present invention.

5 is an exploded perspective view showing a submersion sensor using a piezoelectric element according to a second embodiment of the present invention.

Figure 6 is a front sectional view showing an immersion detection sensor using a piezoelectric element according to a second embodiment of the present invention.

Figure 7 is another embodiment showing a load action column according to a second embodiment of the present invention.

8 is a front sectional view showing an immersion detection sensor using a piezoelectric element according to a third embodiment of the present invention.

9 is a front sectional view showing an immersion detection sensor using a piezoelectric element according to a fourth embodiment of the present invention.

10 is a flow chart illustrating a submersion detection method of the submersion sensor using a piezoelectric element according to the present invention.

11 is a first state diagram showing the installation method of the submersion sensor using a piezoelectric element according to the present invention.

12 is a second use state diagram showing a method of installing a submersion sensor using a piezoelectric element according to the present invention.

Figure 13 is a third use state showing the installation method of the submersion sensor using a piezoelectric element according to the present invention.

14 is a fourth state diagram showing the installation method of the submersion sensor using a piezoelectric element according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: case 11: penetration 12: base 121: sealing

122: fixing protrusion 123: sealing ring 13: guide rail 2: piezoelectric element

3: Expansion member 4: Load acting support 41: Fixed piece 42: Guide surface

43: transfer groove 44: lubricant layer 5: output signal cable 6: elastic spring

7: load column 71: fixture 8: piezoelectric linear motor

Claims (14)

A case 1 having a hexahedron shape in which a plurality of penetration holes 11 are formed on the upper surface and the outer peripheral surface of the upper portion; A piezoelectric element (2) formed on an upper surface of the bottom of the case (1) to detect whether or not it is flooded; An expansion member (3) provided inside the case (1) and expandable by absorbing moisture; A load acting support (4) which transfers a load to the piezoelectric element (2) while supporting the lower portion of the expansion member (3); And And an output signal cable (5) connected to the piezoelectric element (2) to transmit the immersion signal detected by the piezoelectric element (2). The method of claim 1, The case 1 is a bottom plate 12 is formed so that the lower surface of the case 1 can be opened and closed for replacement of the expansion member (3), The bottom plate is inserted into the lower inner surface of the case 1 is formed with a sealing portion 121 protruding to be in close contact, Is formed in the center of the bottom plate 12 a plurality of fixing projections 122 for fixing the piezoelectric element 2 is formed, and Immersion detection sensor using a piezoelectric element, characterized in that the sealing ring 123 is further provided to seal between the lower inner surface of the case (1) and the sealing portion 121. The method of claim 1, An immersion detection sensor using a piezoelectric element, characterized in that an elastic spring (6) is further provided between the piezoelectric element (2) and the load action support (4). The method of claim 1, Between the piezoelectric element 2 and the load action support 4 is further provided with a cylindrical load action column (7) for transmitting the load transmitted from the load action support (4) to the piezoelectric element (2) Immersion detection sensor using a piezoelectric element, characterized in that. The method of claim 4, wherein The load action column (7) is a submerged sensor using a piezoelectric element, characterized in that the conical columnar shape. The method of claim 4, wherein The load acting support 4 is further provided with a ring-shaped fixing piece 41 which protrudes at the bottom and fixes the elastic spring 6 therein. Immersion detection sensor using a piezoelectric element, characterized in that it is further provided with a cylindrical fixing fixture 71 protruding above the load action column (7) to fix the elastic spring (6) on the outer peripheral surface. The method of claim 1, The expansion member (3) is a immersion sensor using a piezoelectric element, characterized in that the swellable fiber. The method of claim 1, The load acting support 4 is further provided with a guide surface 42 which is bent and projected by a predetermined height along the outer circumferential surface, and Immersion detection sensor using a piezoelectric element, characterized in that the guide surface 42 is further provided with a lubricating oil layer 44 applied to one surface that meets the inner surface of the case. The method of claim 1, Two or more guide rails 13 are further provided in the height direction of both inner surfaces of the case 1, and Immersion detection sensor using a piezoelectric element, characterized in that the transfer groove 43 is further provided on the outer peripheral surface of the load acting support (4) at a position corresponding to the guide rail (13). 3. The method of claim 2, And at least one piezoelectric linear motor 8 for adjusting the height of the load acting support 4 between the bottom plate 12 of the case 1 and the load acting support 4. Immersion sensor using a piezoelectric element. The method according to any one of claims 1, 3 and 4, The case (1), the piezoelectric element (2), the elastic spring (6) and the submerged detection sensor using a piezoelectric element, characterized in that provided with two or more load action pillar (7). As a submersion sensing method using a submersion sensor using a piezoelectric element according to any one of claims 1 to 9, Installing the submersion detection sensor in a submersible area (S100); When the installed area is flooded, water is supplied to the penetration hole 11 of the case 1 to expand the expansion member 3 (S200); A step (S300) in which the elastic spring (6) is contracted by the load acting support (4) moving the case (1) to one side by the expanded expansion member (3); When the contraction of the elastic spring (6) is completed, the load of the load action support (4) is transferred to the load action column (7) to move the load action column (7) to one side and press-in the piezoelectric element (2) Step (S400); Immersion using a piezoelectric element characterized in that it detects the pressure applied to the piezoelectric element (2) and outputs the submerged or not signal in the submerged area through the output signal cable (S500) (S500) Immersion detection method of sensor The method of claim 12, The installation step (S100) is installed so that the penetration hole 11 of the case 1 is located below or the penetration hole 11 of the case 1 according to the inundation area in which the immersion detection sensor is installed. The submersion detection method of the submersion detection sensor using a piezoelectric element, characterized in that installed so as to be located above. The method of claim 13, In the installation step (S100), when the penetration hole (1) of the case (1) is installed in the upper portion of the case (1) such that the upper portion including the penetration hole (11) of the case (1) protrudes to the ground Submerged in the ground to a predetermined depth or the case (1) is immersion detection method of the immersion detection sensor using a piezoelectric element, characterized in that the ground is installed so that all except the upper surface.

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