KR20110035831A - Pump control apparatus by capacitance sensing - Google Patents

Pump control apparatus by capacitance sensing Download PDF

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Publication number
KR20110035831A
KR20110035831A KR1020100042831A KR20100042831A KR20110035831A KR 20110035831 A KR20110035831 A KR 20110035831A KR 1020100042831 A KR1020100042831 A KR 1020100042831A KR 20100042831 A KR20100042831 A KR 20100042831A KR 20110035831 A KR20110035831 A KR 20110035831A
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KR
South Korea
Prior art keywords
pump
capacitance
water
pump control
housing
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Application number
KR1020100042831A
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Korean (ko)
Inventor
이경헌
Original Assignee
웅진코웨이주식회사
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Publication of KR20110035831A publication Critical patent/KR20110035831A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

PURPOSE: A pump controller through capacitance sensing is provided to normally operate a pump even in an area with a low water pressure by accurately confirming water flowing into a flow path. CONSTITUTION: A pump controller through capacitance sensing comprises a capacitance detection unit(250), an operation unit, and a pump control unit. The capacitance detection unit senses the capacitance of water. The operation unit compares the capacitance with a pre-set value and generates a pump operation output signal when the capacitance is more than the pre-set value. The operation unit compares the electrostatic capacity and fixed value. The pump control unit operates a pump depending on the pump operation output signal. The capacitance detection unit has a housing, a capacitance sensor, and an air flow controller.

Description

Pump control device through capacitive detection {PUMP CONTROL APPARATUS BY CAPACITANCE SENSING}

The present invention relates to a pump control apparatus through capacitance sensing, and more particularly, to an apparatus for controlling a pump by sensing a capacitance of water in a state of not contacting water flowing into a flow path.

The pump is a device that sends the water flowing in the flow path to the filter at high pressure so that it can be discharged as clean water from the filter. A method of controlling the pump will be described with reference to FIG. 1.

1 is a schematic diagram showing a conventional pump control method. Referring to Figure 1, the outer wall of the flow path 10 is provided with a positive pressure sensor unit 20, the valve 50 is opened, when the water flows into the flow path 10, the positive pressure sensor unit for detecting a certain pressure or more ( The inflow of water is sensed by 20 to allow power to be supplied to the pump 30.

Due to the power supplied to the pump 30, the pump 30 operates, and the water passing through the filter 40 by the operation of the pump is discharged to the outside and is consumed by the user.

Specifically, as shown in FIG. 2, the conventional static pressure sensor unit 20 includes a diaphragm 21 and a micro switch 22 disposed behind the diaphragm 21 on the outer wall of the flow path 10. Doing. In such a static pressure sensor unit 20, when a predetermined or more water pressure is applied to the flow path 10, the diaphragm 21 is elastically deformed and pushed to the outside of the flow path. At this time, the micro switch 22 is pressed to pump The power is supplied to 30).

The conventional pump control method as described above is a method of controlling the pump using water pressure, the diaphragm 21 is not sufficiently deformed when the water pressure is low in the flow path can not press the micro switch 22, the flow path 10 Even if water is introduced into the pump, the pump cannot be operated, and there is a problem in that the pump does not operate normally because the presence of water in the flow path is not exactly known in a region where the water pressure is very low. In addition, there is a fluctuation in the supplied water pressure, which has been a problem because the pump 30 may not operate at the boundary water pressure.

One aspect of the present invention is to provide a pump control device that allows the pump to operate normally even in a region where the water pressure is very low.

One aspect of the present invention, the capacitance detection unit for detecting the capacitance of the water in a state that does not contact the water flowing into the flow path; A calculator configured to compare the capacitance with a preset value and generate a pump operation output signal when the capacitance is greater than or equal to the preset value; And a pump controller for operating the pump by the pump operation output signal. It provides a pump control device through the capacitance sensing, characterized in that it comprises a.

In the present invention, the capacitive sensing unit includes a housing including an inlet and an outlet through which water flows in and out of the flow path, and a through hole communicating with an external space; Capacitive sensor attached to the outer surface of the housing and the air flow control means for allowing the inflow of air through the through hole in the housing when there is only the outflow without the inflow of water.

In addition, the inlet may be formed at a position higher than the outlet.

In addition, the air flow control means is a check valve, the capacitive sensor may be formed on the entire surface of the housing.

In one embodiment of the present invention, the pump control unit provides a pump control device through the capacitive sensing, characterized in that it comprises a MOSFET to operate the pump by the gate is turned on by the pump operation output signal.

In another embodiment of the present invention, the capacitive sensing unit, the calculating unit, the pump control unit provides a pump control device through the capacitance sensing, characterized in that provided on the outside of the tube to form the flow path mounted on the PCB substrate.

In another embodiment of the present invention, the capacitance sensing unit provides a pump control device through the capacitance sensing, characterized in that for detecting the capacitance of the water through the copper plate of the lower surface of the PCB substrate.

In another embodiment of the present invention, the pump control unit provides a pump control device through the capacitive sensing, characterized in that it comprises a relay for operating the pump by the contact is turned on by the pump operation output signal.

According to the present invention, by using the pump control device through the capacitive sensing, it is possible to know exactly whether the water flows into the flow path without being affected by the water pressure, so that the pump operates normally in a region where the water pressure is very low.

In addition, according to the present invention, by using the pump control device through the capacitance detection, it is possible to operate the pump normally, the user can conveniently use a water pressure utilization device (purifier, etc.).

1 is a schematic diagram showing a conventional pump control method.
2 is a schematic view showing a conventional static pressure sensor.
Figure 3 is a schematic diagram showing a pump control method through the capacitance detection of the present invention.
4 is an assembly view of an embodiment of the capacitance sensing unit.
5 is a cross-sectional view of the capacitive sensing unit shown in FIG. 4.
6 is a schematic view showing the pump control device of FIG.
7 is a circuit diagram using a switching device connected to the pump of the present invention as a MOSFET.
8 is a circuit diagram using a switching device connected to the pump of the present invention as a relay.
Figure 9 is a schematic diagram showing the process of purifying the water in the filter of the present invention and discharged to the outside.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Shapes and sizes of the elements in the drawings may be exaggerated for clarity, elements denoted by the same reference numerals in the drawings are the same elements.

Figure 3 is a schematic diagram showing a pump control method through the capacitance detection of the present invention. As shown in Figure 3, the flow path 10 is provided with a capacitance sensing unit 250, the pump control device 200, the pump control device 200 is connected to the pump 300, the flow path 10 The valve 50 for supplying water to the capacitance correction unit 250 is disposed.

4 illustrates an assembly view of an embodiment of the capacitive sensing unit 250 of the present invention. As shown in FIG. 4, the capacitance detecting unit 250 includes an inlet 245 through which water flows from the flow path 10 when the valve 50 is opened, and an outlet 246 through which water escapes from the capacitance detecting unit 250. And a check valve as an air flow control means seated in the housing 240 and the fixing part 242 of the housing 240 in which the fixing part 242 which fixes the check valve 230 is located, 230 and a cover portion 244 covering one surface of the housing 240 is shown. The check valve 230 is fixed inside the housing 240 by the cover part 244 and the fixing part 242 of the housing 240.

As shown in FIG. 4, the capacitive sensor 260 is formed on the outer surface of the cover part 244 to have the same area as the outer surface of the cover part 244, and is attached to the outer surface of the cover part 244. . The capacitive sensor 260 does not need to be formed on the entire outer surface, and may be disposed only on a part of the outer surface. However, when the capacitive sensor 260 is disposed on a large area, more accurate sensing is possible. In addition, although integrally formed with the pump control apparatus 200, it may be formed separately.

When only a part of the capacitive sensor 260 is disposed, the capacitive sensor 260 may be installed at the same height as the inlet 245. In this case, when water is introduced through the inlet 245, the introduced water flows into the cover part 244 to which the capacitive sensor is attached, and the capacitive sensor can immediately detect the inflow of water.

In addition, in this embodiment, the inlet 245 is located higher than the outlet 246 relative to the bottom surface (bottom side in FIG. 4) of the housing 240, so that the capacitive sensor also has a housing 240 than the outlet 246. It is located high with respect to the bottom surface of the, so that when the inflow is blocked and the water flows out from the outlet 246 so that the water near the capacitive sensor is released before all the water inside the housing 240 is drained out. Thus, the capacitive sensor 260 can react faster.

5 is a cross-sectional view of the capacitive sensing unit 250 of the present invention. As shown in FIG. 5, the housing 240 has a through hole 241 which is in communication with the outside, and normally, the protrusion 231 of the check valve 230 is blocking the through hole 241. When there is no inflow of water from the 245, only the outflow from the outlet 246, and the pressure inside the housing becomes lower than the outside pressure, the outside air pushes the upper portion 232 of the check valve 230 to the through hole 241. Through the air is introduced into the housing 240.

If there is no air flow control means such as the check valve 230, the capacitive sensor 250 is to suck the water inside without pumping any water (water or air), so that one end of the straw As such, no matter how the water is sucked by the pump, the water of the capacitive sensor 250 does not escape, and thus the capacitance of the capacitive sensor 260 does not change even if the valve 50 is closed, thereby causing a malfunction. .

The check valve 230 includes an upper portion 232 including a protrusion 231 fitting into the through hole 241 and a lower portion 236 and an upper portion 232 and a lower portion fitting the housing 240 and the cover portion 244. It is composed of a spring 234 is located between the 236 to press the upper portion 232 of the check valve 230 toward the through hole 241. The upper portion 232 of the check valve 230 is formed with a guide member 238 to determine the movement path of the upper portion 232, so that the upper portion 232 can always move to the same position.

In this embodiment, the check valve 230 is used as an air flow control means, but the water inside the housing 240 does not flow out, and when the pressure inside the housing is lower than the outside, the air flows in. If possible, other air flow control means may be used.

In the present embodiment, when the inflow of water is blocked and there is only an outflow, air is introduced into the housing 240 through the through hole 241 together with the outflow of water so that the inside of the housing 240 is only air in accordance with the operation of the pump. Can be filled.

6 is a schematic view showing the pump control device of FIG. In addition, referring to FIG. 6, the pump control apparatus 200, in which the IC chip 210 and the switching element 220 are mounted on a PCB substrate, is provided outside the pipe forming the flow path 10.

The IC chip 210 is a device in which the capacitance sensing unit and the computing unit are implemented by a program.

The capacitance sensing unit detects the capacitance of the water through the copper plate on the lower surface of the PCB substrate in a state of not contacting the water flowing into the flow path 10. That is, the capacitance sensing unit is connected to the copper plate and the copper plate is in contact with the outside of the pipe forming the flow path 10, the capacitance of the water by measuring the capacitance between the ground and the copper plate of the pipe forming the flow path 10 Can be detected.

The calculation unit receives a detection signal indicating the capacitance of the water detected by the capacitance detection unit, and compares the capacitance of the water with the preset value and generates a pump operation output signal when the water capacitance is greater than the preset value. The preset value is the capacitance of the water flowing in the flow path 10 when the pump control unit starts the pump operation.

The switching element 220 is a device in which the pump control unit is implemented, and the pump control unit operates the pump 300 by the pump operation output signal generated by the calculation unit. The switching element 220 may be implemented as a MOSFET, a relay, or the like, and may also be implemented as other switching means. Switching elements implemented with MOSFETs and relays will be described in detail with reference to FIGS. 4 and 5, respectively.

7 is a circuit diagram using a switching device connected to the pump of the present invention as a MOSFET. Referring to FIG. 7, current flowing from a 24V power supply flows through R1 and R2. Part of the current through R1 and R2 flows to ground through R3, and the other part of the current through R1 and R2 flows through R4 to the gate of a MOSFET (metal-oxide-semiconductor field-effect transistor). (G) applied to the voltage.

MOSFETs are the most common field effect transistors (FETs) in digital and analog circuits, and MOSFETs can be configured as channels of N-type semiconductors or P-type semiconductors. In the present invention, an N-type depletion MOSFET is used.

The MOSFET is turned on by the pump operation output signal to operate the pump. When the gate voltage of the MOSFET is higher than the reference voltage, the MOSFET is turned on, and current flows from the 24V power supply to the pump 300 to drain the MOSFET (D). Current flows through the source S to ground.

8 is a circuit diagram using a switching device connected to the pump of the present invention as a relay. Referring to FIG. 5, a current flowing from a 24V power supply flows through the resistor R1 and the resistor R2. A part of the current through the resistor R1 and the resistor R2 flows to ground through the resistor R3, and the other part of the current through the resistor R1 and the resistor R2 turns on the relay relay through the resistor R4 to operate the pump 300. Let's do it.

The relay is turned on by the pump operation output signal to operate the pump. At this time, a current flows from the 24V power supply to the pump 300 and a current flows from the drain D of the MOSFET to the ground through the source S.

Figure 9 is a schematic diagram showing the process of purifying the water in the filter of the present invention and discharged to the outside. Referring to FIG. 9, the filter 400 may include a sediment filter 410, a sun carbon filter 420, a membrane filter 430, and a fucarbon filter 440 as a key part for purifying water. . The capacitive sensor 250 is positioned in front of the sentiment filter 410, and the pump 300 is positioned between the sun carbon filter 420 and the membrane filter 430.

The sediment filter 410 filters the raw water by filtering out relatively large particles, foreign matters, etc. in the water. The water passing through the sediment filter 410 is sent to the membrane filter 430 after the residual chlorine or volatile organics are removed from the sun carbon filter 420. In the membrane filter 430, heavy metals, ionic substances, microorganisms, and the like contained in the water are removed. Water passing through the membrane filter 430 is sent to the carbon filter 440 to remove the smell, etc. and is sent to the storage tank 500 is stored. Water stored in the reservoir tank 500 is discharged to the outside by the open operation of the extraction cock 520 installed in the extraction unit 510.

In the case of the membrane filter 430, since a high water pressure is required and the water pressure supplied from a water source may be insufficient, when the inflow of water is sensed by the capacitance detecting unit 250, the pump 300 is operated to operate the member. The water passing through the plane filter 430 is pushed.

In the present embodiment, four filters, a sediment filter 410, a sun carbon filter 420, a membrane filter 430, and a post carbon filter 440, are used, but the present invention is not limited thereto. Other filters may be added or some of the filters may be omitted, and the configuration of the filter itself may be entirely different. In addition, the position of the capacitance sensing unit 250 and the position of the pump 300 may also vary as necessary. Therefore, in general, the present invention can select and use the type of filter that can be installed in the water purifier.

Referring to the operation of the pump control device of the present invention, when the purified water starts to open the valve 50, the raw water is introduced into the capacitance sensing unit 250 through the valve. At this time, the capacitance sensor 260 changes the capacitance due to the inflow of raw water, the pump control unit 210 operates the pump 300 in accordance with the change of the capacitance.

On the other hand, when the purified water is finished, the valve 50 is closed, and thus there is no inflow of water flowing into the capacitance detecting unit 250. At this time, even if the valve 50 is shut off, since the pump 300 is still operating, the capacitive sensing unit 250 is only sucked out by the pump 300 without the inflow of water and thus the capacitive sensing unit 250. ) Is subjected to negative pressure. When the negative pressure is applied to the capacitance detecting unit 250, external air pushes the upper portion 232 of the check valve 230 and enters the inside of the housing 240 through the through hole 241. As the air flows in, the remaining water passes through the capacitance detecting unit 250, and the capacitance of the capacitance sensor 260 changes again. The pump controller 210 stops the operation of the pump according to the change in capacitance of the capacitance sensor 260.

As described above, the pump control apparatus using the capacitance sensing device includes a capacitance sensing unit, a calculating unit, and a pump control unit, so that the presence or absence of water is accurately influenced by the hydraulic pressure, so that the hydraulic pressure is very high. The pump will operate normally even in low areas.

In addition, the pump control device through the capacitive sensing of the present invention is used in a water purifier, and if the device utilizing other water pressure can be applied to the same principle of course.

The present invention is not limited by the above-described embodiment and the accompanying drawings. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, .

10: Euro 200: pump control device
210: IC chip 220: switching element
230: check valve 240: housing
241 through hole 242 fixed part
244 cover portion 245 inlet
246: outlet 250: capacitance detection unit
300: pump 400: filter
410: sediment filter 420: sun carbon filter
430 membrane filter 440 fucarbon filter
500: storage tank 510: extraction unit
520: extraction coke

Claims (8)

A capacitance sensing unit for sensing a capacitance of the water while not in contact with the water flowing into the flow path;
A calculator configured to compare the capacitance with a preset value and generate a pump operation output signal when the capacitance is greater than or equal to the preset value; And
A pump controller which operates the pump by the pump operation output signal;
Pump control device through the capacitive detection, comprising a. The method of claim 1,
The capacitive sensing unit
A housing including an inlet and an outlet through which water flows in and out of the flow path, and a through hole communicating with an external space;
A capacitive sensor attached to an outer surface of the housing;
And an air flow control means for allowing air to flow through the through hole into the housing when there is only an outflow without the inflow of water into the housing. The method of claim 2,
The inlet is formed of a pump control device, characterized in that formed in a position higher than the outlet. The method of claim 2,
The air flow control means is a check valve, the capacitive sensor is a pump control device through the capacitance detection, characterized in that formed on the entire surface of the housing. The method of claim 1,
And the pump control unit includes a MOSFET for operating the pump by turning on the gate by the pump operation output signal. The method of claim 1,
The capacitive sensing unit, the calculating unit, the pump control unit is mounted on a PCB substrate pump control device characterized in that provided on the outside of the tube to form the flow path. The method of claim 1,
The capacitive sensing unit is a pump control device through the capacitance sensing, characterized in that for detecting the capacitance of the water through the copper plate of the lower surface of the PCB substrate. The method of claim 1,
The pump control unit is a pump control device through a capacitive sensing, characterized in that it comprises a relay for operating the pump by the contact is turned on by the pump operation output signal.
KR1020100042831A 2009-09-30 2010-05-07 Pump control apparatus by capacitance sensing KR20110035831A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20090093121 2009-09-30
KR1020090093121 2009-09-30

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KR20110035831A true KR20110035831A (en) 2011-04-06

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KR1020100042831A KR20110035831A (en) 2009-09-30 2010-05-07 Pump control apparatus by capacitance sensing

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210103634A (en) * 2020-02-13 2021-08-24 주식회사 유니크 Water detector and water traps having the same
CN113944640A (en) * 2021-12-20 2022-01-18 江苏庆泉泵业有限公司 Submersible pump control system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210103634A (en) * 2020-02-13 2021-08-24 주식회사 유니크 Water detector and water traps having the same
CN113944640A (en) * 2021-12-20 2022-01-18 江苏庆泉泵业有限公司 Submersible pump control system and method

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