KR20150072039A - Electrostatic capacitance type system for sensing liquid level - Google Patents

Electrostatic capacitance type system for sensing liquid level Download PDF

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Publication number
KR20150072039A
KR20150072039A KR1020130159276A KR20130159276A KR20150072039A KR 20150072039 A KR20150072039 A KR 20150072039A KR 1020130159276 A KR1020130159276 A KR 1020130159276A KR 20130159276 A KR20130159276 A KR 20130159276A KR 20150072039 A KR20150072039 A KR 20150072039A
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KR
South Korea
Prior art keywords
conductive
capacitance value
water tank
fluid
conductive bar
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Application number
KR1020130159276A
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Korean (ko)
Inventor
홍성욱
Original Assignee
주식회사 우정하이텍
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Application filed by 주식회사 우정하이텍 filed Critical 주식회사 우정하이텍
Priority to KR1020130159276A priority Critical patent/KR20150072039A/en
Publication of KR20150072039A publication Critical patent/KR20150072039A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields

Abstract

The present invention relates to a capacitance type water level sensing system for sensing a water level by constantly maintaining an electrostatic capacity varying with the size of a water tank in which fluid is stored regardless of the size of the water tank, A fluid supply part for supplying fluid to the water tank; a conductive bar made up of a conductive bar and a conductive cylinder configured such that the conductive bar is disposed at the center, and a height of the fluid supplied to the water tank Wherein the second capacitance value is ignored when the first capacitance value is measured, and the second capacitance value is ignored when the first capacitance value is measured, wherein the second capacitance value is generated between the conductive bar and the conductive cylinder, and a second capacitance value sensed by the conductive conductor; And a main control unit for controlling the valve of the fluid supply unit according to the second capacitance value.
Accordingly, since the water level can be measured regardless of the size of the product constituting the water tank, the present invention has an economical effect in that it is not necessary to make a water level sensing system for each product.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electrostatic capacitance type sensing system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitance type water level sensing system, and more particularly, to a capacitance type water level sensing system for sensing a water level by maintaining a constant capacitance that varies depending on a size of a water tank, ≪ / RTI >

In the conventional capacitance type water level sensing system, a capacitance is generated between the water tank and the earth (earth). For example, as shown in FIG. 1, a capacitance value of C1 for the water tank A1 between the water tank and the earth A capacitance value of C1 + C2 is generated for the water tank in which A1 and A2 are combined, and a capacitance value of C1 + C2 + C3 is generated for the water tank in which A1, A2, and A3 are combined.

Therefore, since capacitance values have different values depending on the size of the water tank, there is a problem that it is not accurate in measuring the height of the fluid stored in the water tank.

BACKGROUND ART [0002] As a technique related to a conventional capacitive level sensing system, a capacitive level sensing system and system disclosed in Korean Patent Laid-Open Publication No. 10-2008-0050868 includes a liquid storage tank for storing a liquid, A pipe connected to the pipe through which the liquid stored in the liquid storage tank flows through the through hole having a predetermined diameter and installed at the same level as the liquid stored in the liquid storage tank; And a signal processor for signal processing for converting a change amount of the capacitance detected by the capacitance sensing sensor into a water level value, wherein the water level sensor detects a change amount of the capacitance according to the level of the liquid flowing into the pipe, And a display unit for displaying signal processing values processed by the signal processing unit, This is a technique to prevent the generation of impurities by the reaction and to significantly reduce the defective rate generated in the liquid treatment process.

Also, Korean Patent Application Publication No. 10-2010-0085418 discloses an electrostatic capacity level detecting sensor and system. The electrostatic capacity level detecting sensor is provided inside a liquid storage tank for storing a liquid, and senses a change amount of the electrostatic capacity according to a water level. A signal processing unit for performing signal processing for converting a change amount of capacitance detected by the capacitance water level detection sensor into a water level value, and a display unit for displaying a signal processing value processed by the signal processing unit, The electrostatic capacity level detecting sensor is for detecting the level of the liquid surface by the density change of the electric force line passing through the liquid. The external electrode means is a third electrode formed in the liquid storage tank. A second electrode which is a ground electrode on the outer peripheral surface of the insulating pipe, and an insulating ring made of an insulating material, copper pipe or copper foil And an internal electrode means having a first electrode, an insulating ring, and a second electrode sequentially arranged and fixed in the outer insulating pipe. In order to measure the level of the liquid stored in the liquid storage tank, To detect the liquid level accurately and to ensure the effectiveness of the sensed information.

In addition, Korean Patent Laid-Open Publication No. 10-2011-0026093, which is a capacitance type water level sensing system, includes a liquid storage tank for storing a liquid, a bypass pipe communicating with the liquid storage tank and having the same water level as the liquid storage tank, A first blocking plate detachably attached to an outer circumferential surface of the bypass pipe; a second blocking plate attached to the outer surface along the longitudinal direction of the first blocking plate, A second shield plate covering the first shield plate and the electrode unit, and a second shield plate surrounding the first shield plate, the electrode unit, and the second shield plate, And a fixed holder which is detachably fixed, and which has a capacitance type water level sensor for sensing a change amount of the capacitance in accordance with the level of the liquid flowing into the bypass pipe And a display unit for displaying a signal processing value processed by the signal processing unit, wherein the sensing sensor is damaged, and the sensor is damaged There has been a technique for replacing the sensor when it is necessary to replace it conveniently and for accommodating a plurality of electric wires connected to the detection sensor to have a neat appearance.

Such a conventional technique is related to the electrostatic capacity level sensing system. However, according to the present invention, even if the electrostatic capacitance value varies according to the size of the water tank, the water level can not be sensed regardless of the size of the water tank.

(1) Korean Patent Publication No. 10-2008-0050868 (published on June 10, 2008) (2) Korean Patent Publication No. 10-2010-0085418 (published on July 29, 2010) (3) Korean Patent Publication No. 10-2011-0026093 (published on Mar. 15, 2011)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to improve the structure of a conductive conductor to sense a water level irrespective of the size of a water tank.

According to an aspect of the present invention, there is provided a capacitance type water level sensing system including a water tank for storing fluid, a ground (earth) having a first capacitance value varying with the size of the water tank, A fluid supply part for supplying a fluid to the water tank; and a second electrostatic charge generator which is constituted by a conductive bar and a conductive cylinder configured to center the conductive bar and measures the height of the fluid supplied to the water tank, A control unit for receiving a second capacitance value sensed by the conductive conductor, wherein the capacitance value is generated between the conductive bar and the conductive cylinder, and a control unit for controlling the valve of the fluid supply unit in accordance with the second capacitance value, And a control unit.

INDUSTRIAL APPLICABILITY As described above, since the water level can be measured irrespective of the size of the product constituting the water tank, there is an economical effect that it is not necessary to make a water level sensing system for each product.

Fig. 1 is an example of a capacitance generated between a conventional water tank and the earth (earth)
2 is a schematic diagram of a capacitance type water level sensing system according to an embodiment of the present invention
FIG. 3 is a block diagram of a control section and a conductive conductor according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view taken along line B 'and B' of a conductive conductor according to an embodiment of the present invention.
5 is a cross-sectional view taken along line C 'and C' of a conductive conductor according to an embodiment of the present invention.
Figure 6 is an illustration of an example in which the conductive cylinder of the conductive conductor according to one embodiment of the present invention is a spring structure
7 is a rear view of a conductive conductor according to an embodiment of the present invention.

Best Mode for Carrying Out the Invention Hereinafter, a configuration and an operation of a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram of a capacitance type water level sensing system according to an embodiment of the present invention. The capacitance type water level sensing system includes a water tank 10, a earth 20, a ground, a fluid supply unit 30, 40, a control unit 50, and a main control unit 60.

More specifically, the water tank 10 stores the fluid.

The earth (20, earth) has a first capacitance value that varies according to the size of the water tank (10).

That is, the first capacitance value A shown in FIG. 2 varies in accordance with the size of the water tank 10 in the earth 20 (earth).

Therefore, the present invention improves the structure of the conductive conductor 40 so that it can be stably measured at the water level measurement even if the A shown in FIG. 2 changes.

The fluid supply part (30) supplies fluid to the water tub (10).

That is, when the second electrostatic capacitance value is measured by the conductive conductor 40, the measured second electrostatic capacitance value is collected by the controller 50, and the collected second electrostatic capacitance value is measured by the main The main control unit 60 controls the valve provided in the fluid supply unit 30 to supply the fluid to the water tub 10 as it is transmitted to the controller 60. [

At this time, the second capacitance value is a value that can finally determine the height of the fluid stored in the water tub 10.

The conductive conductor 40 includes a conductive bar 41 and a conductive cylinder 42 configured to center the conductive bar 41. In measuring the height of the fluid supplied to the water tub 10, A second capacitance value at which one capacitance value is ignored is generated between the conductive bar 41 and the conductive cylinder 42. [

3 and 4, the conductive bar 40 is formed so that the conductive bar 41 is disposed at the center of the conductive bar 40, And the conductive cylinder 42, a second capacitance value such as D, D 'is generated.

In this case, the second capacitance value generated as D, D 'corresponds to the capacitance C1, C2, C3 between the water bath 10 and the earth 20 (earth) described in the related art, The capacitance value is generated so large as to be ignored.

Meanwhile, although the water tank 10 is used in a product including the water tank 10 such as a humidifier and a dehumidifier, the size of the water tank 10 is generally limited. However, in the case where the water tank 10 has a large size for a special purpose, The first capacitance values of C1, C2 and C3 shown in FIG. 1 may be larger than the above D and D ', but the radius of the conductive cylinder 42 may be simply increased to easily change the values of D and D' .

The conductive bar 42 may be a conductive spring that surrounds the conductive bar 41.

That is, when the conductive conductor 40 is a conductive cylinder 42, since the upper portion of the conductive cylinder 42 is closely attached due to the structural characteristics of the control unit 50, And the height of the water introduced into the conductive cylinder 42 may be different from each other.

Because of this, the second capacitance value sensed by the conductive conductor 40 is not a sensing value corresponding to the height of the actual water tank, so that an error may occur.

Therefore, as shown in FIG. 7, the conductive spring is easy to move the fluid due to the gap formed due to the structural characteristics of the spring, and the conductive spring also has the values of D and D 'shown in FIG. There may be some errors but this is almost negligible.

The conductive bar 41 may be slightly different in height from product to product. However, when the conductive bar 42 is used, the conductive bar 41 must be manufactured separately to meet the height of the conductive bar 41. However, When the conductive spring is used as the conductive spring, the width and the length of the conductive spring can be easily adjusted by the elasticity of the conductive spring. Thus, the values of D and D ' And has a second capacitance that is large enough to ignore the first capacitance value.

In the case where the conductive bar 41 is channel 1, it is preferable that the conductive cylinder 42 is a channel 2 or a ground.

That is, when the conductive bar 41 is a channel 1 and the conductive cylinder 42 is ground, the conductive bar 41 becomes a channel 1 when a signal is transmitted from the controller 50 to the conductive bar 41 The conductive bar 41 of the channel 1 transmits a second capacitance value for measuring the water level to the control unit 50. At this time, the conductive cylinder 42 acts as a ground due to the fluid, so that the channel 1 by the conductive bar 41 To the control unit (50).

Although the water level can be measured by such a method, when the conductive cylinder 42 acts as a ground, there is a problem that the capacitance value is absorbed very much or the accurate water level can not be detected even under a special situation.

Accordingly, the conductive bar 41 can solve the above problem when it is the channel 1 and the conductive cylinder 42 acts as the channel 2.

In the case where the conductive bar 41 is a channel 1 and the conductive cylinder 42 is a channel 2, in outputting a second capacitance value in the channel 1 and the channel 2 in the same time zone, the conductive bar 41 and the conductive fluid 42 If there is a fluid in the passage 43 between the conductive bar 41 and the channel 41, the loss of the fluid is small, and if there is no fluid, the loss is large. The second capacitance value on the side of the conductive cylinder 42 will normally appear on the channel 2 side.

Therefore, it is possible to detect that the channel 1 malfunctions.

When the water droplet comes into contact with the channel 2, that is, the conductive cylinder 42, the second capacitance value on the side of the conductive cylinder 42 will suddenly become high, and the second capacitance value of the conductive bar 41 will normally appear on the channel 1 .

Therefore, it is possible to detect that the channel 2 malfunctions.

As a result, since the conventional technology does not utilize two channels, it can easily be solved that the conductive conductor 40 can not be detected as a malfunction.

It is preferable that the conductive bar 41 is a channel 1 and the conductive spring is a channel 2 or a ground.

In addition, since the conductive spring 42 performs the same function as the conductive cylinder 42, the detailed description will be omitted.

Although it is preferable that the conductive conductor 40 described above is integrally coupled with the control unit 50, it is also preferable that the conductive conductor 40 is detachably coupled.

That is, when the impurity due to the fluid adheres to the outer circumferential surface of the conductive bar 41 of the conductive conductor 40 or the inner circumferential surface of the conductive cylinder 42 or the conductive spring, there may occur a situation in which measurement of the second capacitance value can not be accurately performed (The portion where the conductive conductor 40 shown in FIG. 6 is hatched) between the conductive conductor 40 and the control portion 50 as shown in FIG. 6 is subjected to various joining .

7, in order to fix the conductive bar 41 floating in the passageway 43, the conductive bar 40 may not be fixed prior to being easily separated from the controller 50. In this case, 41 via a coupling member 44 between the conductive cylinder 42 or the conductive spring.

The engaging member 44 engaging the conductive bar 41 with the conductive cylinder 42 or the conductive spring influences the second capacitance value between the conductive bar 41 and the conductive cylinder 42 or the conductive spring. It is not enough.

The controller 50 receives the second capacitance value sensed by the conductive conductor 40.

In addition, the controller 50 receives the capacitance value generated by the conductive conductor 40 and determines a malfunction.

The malfunction judgment is as described above for the case where the conductive bar 41 is the channel 1 and the conductive cylinder 42 is the channel 2 or the ground, and is controlled through this.

The main control unit 60 controls the valve of the fluid supply unit 30 according to the second capacitance value.

As a result, since the second electrostatic capacitance value is the height of the fluid stored in the water tank 10, the main control unit 60 controls the valve of the fluid supply unit 30 through the second electrostatic capacitance value to control the water level You can do it.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to cover further limitations anddisclamping the scope of the present invention as defined by the appended claims. It is not.

Therefore, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

10: Water tank 20: Earth (earth)
30: fluid supply part 40: conductive conductor
41: conductive bar 42: conductive cylinder
43: passage 44:
50: control unit 60:

Claims (4)

A water tank for storing the fluid;
A ground (earth) having a first capacitance value varying with the size of the water tank;
A fluid supply unit for supplying fluid to the water tank;
Wherein the first capacitance value is ignored when measuring the height of the fluid supplied to the water tank, the second capacitance value being generated between the conductive bar and the conductive cylinder A conductive conductor;
A control unit receiving a second capacitance value sensed by the conductive conductor; And
And a main control unit for controlling the valve of the fluid supply unit according to the second capacitance value.
[2] The apparatus of claim 1,
And a conductive spring surrounding the conductive bar.
The method according to claim 1,
Wherein the conductive bar is channel 1 and the conductive cylinder is channel 2 or ground.
The method of claim 2,
Wherein the conductive bar is channel 1 and the conductive spring is channel 2 or ground.
KR1020130159276A 2013-12-19 2013-12-19 Electrostatic capacitance type system for sensing liquid level KR20150072039A (en)

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Application Number Priority Date Filing Date Title
KR1020130159276A KR20150072039A (en) 2013-12-19 2013-12-19 Electrostatic capacitance type system for sensing liquid level

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Application Number Priority Date Filing Date Title
KR1020130159276A KR20150072039A (en) 2013-12-19 2013-12-19 Electrostatic capacitance type system for sensing liquid level

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210116180A (en) 2020-03-16 2021-09-27 황건호 Level measuring method using capacitance
KR20210116179A (en) 2020-03-16 2021-09-27 황건호 Level measuring apparatus using capacitance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210116180A (en) 2020-03-16 2021-09-27 황건호 Level measuring method using capacitance
KR20210116179A (en) 2020-03-16 2021-09-27 황건호 Level measuring apparatus using capacitance

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