CN113440073B - Method for measuring liquid level in water tank - Google Patents
Method for measuring liquid level in water tank Download PDFInfo
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- CN113440073B CN113440073B CN202110730387.6A CN202110730387A CN113440073B CN 113440073 B CN113440073 B CN 113440073B CN 202110730387 A CN202110730387 A CN 202110730387A CN 113440073 B CN113440073 B CN 113440073B
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- Prior art keywords
- water tank
- electrode
- sensor
- water
- control circuit
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
- A47L11/408—Means for supplying cleaning or surface treating agents
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
- A47L11/4002—Installations of electric equipment
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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
Abstract
The invention discloses a method for measuring liquid level in a water tank, which comprises the following steps: the sensor is arranged in the side wall of the water tank; a voltage balance electrode is arranged at the lowest end of the sensor; arranging a detection electrode above the voltage balance electrode, wherein the detection electrode is connected to a control circuit of the sensor through a high resistance state; the control circuit judges whether the detection electrode is submerged or contacted by water or not by detecting the change of the voltage value on the detection electrode or the change of the current between the detection electrode and the voltage balance electrode; the water level or the water quantity is obtained through the position of the detection electrode which is determined in advance. The method of the application utilizes the conductivity of water (except purified water) and detects the resistance change condition between the electrodes through the control circuit to obtain the water level.
Description
Technical Field
The invention relates to the technical field of sweeping robots, in particular to a method for measuring liquid level in a water tank.
Background
The floor sweeping robot is also called a lazy floor sweeping machine, and is an intelligent household appliance capable of automatically absorbing dust on the ground. Because it can detect factors such as room size, furniture are put, ground cleanliness to rely on built-in procedure, formulate reasonable clean route, possess certain intelligent effect. The current robot of sweeping the floor is equipped with the water tank in order to have better dust removal and clean the effect, but the current robot of sweeping the floor can't measure the height of water level in the water tank, needs the manual work to look over, if the manual work is looked over untimely, will lead to the lack of water, and then can further influence and clean the effect.
Disclosure of Invention
The invention provides a method for measuring liquid level in a water tank, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for measuring the liquid level in a water tank comprises the following steps:
the sensor is arranged in the side wall of the water tank;
a voltage balance electrode is arranged at the lowest end of the sensor;
arranging a detection electrode above the voltage balance electrode, wherein the detection electrode is connected to a control circuit of the sensor through a high-resistance state;
the control circuit judges whether the detection electrode is submerged or contacted by water through the change of the voltage value on the detection electrode or the change of the current between the detection electrode and the voltage balance electrode;
the water level or the water quantity is obtained through the position of the detection electrode which is determined in advance.
In some embodiments, the embedding of the sensor on the side wall of the water tank comprises:
a mounting hole is formed in the side wall of the water tank;
the sensor is hermetically installed inside the water tank through the installation hole, and the detection end of the sensor is arranged in the water tank and used for measuring the height of the liquid level in the water tank.
In some embodiments, the sensor comprises: plate electrode and sensor housing, sensor housing include the front panel and the back shroud of mutual lock, and it has the installation cavity of inlet opening to open from top to bottom to form behind front panel and the back shroud lock, the plate electrode is installed in the installation cavity, be equipped with the control circuit who is used for control electrode board in the front panel, be equipped with on the front panel with the metal contact that control circuit connects.
In some embodiments, the side wall of the water tank is provided with a mounting opening, the front panel is provided with an open circular boss, a metal contact is arranged in the circular boss, and when the front panel is mounted on the water tank, the circular boss penetrates out of the mounting opening.
In some embodiments, the sensor comprises: plate electrode and sensor housing are equipped with protruding installation cavity of just opening from top to bottom the inlet opening on the sensor housing, the plate electrode is installed in the installation cavity, be equipped with the control circuit who is used for control plate electrode in the sensor housing, the sensor housing be keep away from one side of installation cavity be equipped with the metal contact that control circuit connects.
In some embodiments, the front panel and the mounting opening and the mounting hole of the water tank are sealed by waterproof rubber rings.
Drawings
FIG. 1 is a detail view of a liquid level measurement device within a tank according to some embodiments of the present application;
FIG. 2 is a schematic view of an in-tank level measurement device according to some embodiments of the present application;
the labels in the figure are: 1-electrode plate, 2-back cover plate, 3-front panel, 4-water tank, 5-mounting hole, 6-mounting hole and 7-water inlet hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
On the contrary, this application is intended to cover any alternatives, modifications, equivalents, and alternatives that may be included within the spirit and scope of the application as defined by the appended claims. Furthermore, in the following detailed description of the present application, certain specific details are set forth in order to provide a better understanding of the present application. It will be apparent to one skilled in the art that the present application may be practiced without these specific details.
FIG. 1 is a detail view of a liquid level measurement device within a tank according to some embodiments of the present application; FIG. 2 is a schematic view of an in-tank level measurement device according to some embodiments of the present application; the body of the liquid level measuring device in the water tank according to the embodiment of the present application will be described in detail with reference to fig. 1. It should be noted that the following examples are only for explaining the present application and do not constitute a limitation to the present application.
In an embodiment of the present application, as shown in fig. 1-2, a method of measuring a liquid level in a tank, comprises the steps of:
s1: the sensor is arranged in the side wall of the water tank;
s2: a voltage balance electrode is arranged at the lowest end of the sensor;
s3: arranging a detection electrode above the voltage balance electrode, wherein the detection electrode is connected to a control circuit of the sensor through a high resistance state;
s4: the control circuit judges whether the detection electrode is submerged or contacted by water or not by detecting the change of the voltage value on the detection electrode or the change of the current between the detection electrode and the voltage balance electrode;
s5: the water level or the water quantity is obtained through the position of the detection electrode which is determined in advance.
In some embodiments, the sensor is built in the inner side wall of the water tank 4, and specifically includes: a mounting hole 5 is formed in the side wall of the water tank 4; the sensor is hermetically installed inside the water tank 4 through the installation hole 5, and the detection end of the sensor is embedded inside the water tank 4 and used for measuring the height of the liquid level inside the water tank 4. The sensor includes: electrode plate 1 and sensor housing, sensor housing include front panel 3 and back shroud 2 of mutual lock, and it has the installation cavity of inlet opening 7 to open from top to bottom to form behind front panel 3 and the 2 locks of back shroud, electrode plate 1 is installed in the installation cavity, be equipped with the control circuit who is used for control electrode plate 1 in the front panel 3, be equipped with on the front panel 3 with the metal contact that control circuit connects. Mounting hole 6 has been seted up to the lateral wall of water tank 4, be equipped with open circular boss on the front panel 3, be equipped with the metal contact in the circular boss, when front panel 3 installed on water tank 4, circular boss followed mounting hole 6 is worn out. The front panel 3 and the electrode plate 1 are waterproof by sealant, and the rear cover plate 2 and the front panel 3 are fixed by a buckle type structure.
The water level is obtained by detecting the resistance change between the electrodes through a control circuit by utilizing the conductivity of water (except purified water). The change in resistance between the electrodes is converted into a change in current between the electrodes or a change in voltage across the electrodes. A voltage balance electrode with a large area is arranged at the lowest end of the sensor, so that the potential of the whole water is in a relatively stable state. The detection electrodes are uniformly or regularly arranged above the voltage balance electrode and are connected to the control circuit through a high-resistance state.
When the water amount is small, only the voltage balance electrodes are in the water, and the voltages on all the detection electrodes are in an unstable or set value. When the amount of water increases, the detection electrode near the voltage balance electrode is preferentially contacted with the water, and the voltage on the detection electrode is biased toward the voltage of the voltage balance electrode. The control circuit judges whether the detection electrode is submerged or contacted by water by detecting the change of the voltage value on the detection electrode or the change of the current between the detection electrode and the voltage balance electrode. The water level or the water amount can be obtained by determining the position of the detection electrode in advance.
In this embodiment, the sensor adopts an analog signal output scheme of an operational amplifier, the voltage balance electrode is connected with the positive power supply or the negative power supply, the detection electrode is connected with the in-phase end of the operational amplifier, and the inverting end of the operational amplifier is connected with 1/2 power supply voltage or other voltage values as a comparison reference. When the voltage balance electrode is connected with the power supply, the operational amplifier outputs positive voltage of the power supply after the detection pin is contacted with water; when the voltage balance electrode is connected with the power supply and is negative, the operational amplifier outputs the negative voltage of the power supply after the detection pin is contacted with water. Each detection electrode is used as a channel, and the output pins of the operational amplifier of each channel are connected in parallel through the same resistor. Different water levels correspond to different quantities of operational amplifier output power supply voltages, and the output voltages connected in parallel through the same resistor correspond to the height of the water level. The control system calculates the water level height by detecting the output voltage value. The output voltage value is in a linear relation with the water level height.
In some embodiments, the sensor comprises: electrode plate 1 and sensor housing are equipped with protruding and open the installation cavity that has inlet opening 7 from top to bottom on the sensor housing, electrode plate 1 is installed in the installation cavity, be equipped with the control circuit who is used for controlling electrode plate 1 in the sensor housing, the sensor housing be keep away from the installation cavity one side be equipped with the metal contact that control circuit connects. The front panel 3 and the mounting opening 6 and the mounting hole 5 of the water tank 4 are sealed by waterproof rubber rings. In this embodiment, the sensor adopts an ADC digital signal output scheme, the voltage balance electrode is connected to the positive or negative power supply, the detection electrode is connected to the ADC pin of the monolithic computer, and the voltage of the ADC pin is about half of the power supply voltage when the ADC pin is in a high resistance state. When the voltage balance electrode is connected with the power supply, the ADC value is higher than half of the power supply voltage after the detection pin is contacted with water, and the ADC value is close to the power supply voltage; when the voltage balance electrode is connected with the power supply, the ADC value is lower than half of the power supply voltage after the detection pin is contacted with water, and the ADC value is close to the power supply voltage. The singlechip judges the water level by combining the voltage states of all the detection electrodes and outputs a digital signal to the control system through the IO port.
The method for measuring the liquid level in the water tank disclosed by the application can bring the following beneficial effects, including but not limited to:
1. the plate electrode is in the tubular structure installation cavity, and open from top to bottom of installation cavity has the inlet opening, when the water tank rocked, because the business turn over water volume of installation cavity received the restriction, the water level variation volume in the installation cavity can reduce or slow down to reach more stable and accurate water level information.
2. The whole control circuit is sealed in the sensor shell, and only the detection electrode is reserved to be in contact with water in the water tank, so that the aim of preventing water is fulfilled.
3. The sensor is embedded into the water tank, so that the floor sweeping robot can adapt to narrow space, and the requirement for installing the sensor cannot be met outside the water tank.
4. The sensor and the control system of the floor sweeping robot are in contact by metal contacts, so that the use is simplified, and a connector lug is not required to be plugged or pulled out when water is changed in the water tank.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A method for measuring the liquid level in a water tank is characterized by comprising the following steps:
the sensor is arranged in the side wall of the water tank;
a voltage balance electrode is arranged at the lowest end of the sensor;
arranging a detection electrode above the voltage balance electrode, wherein the detection electrode is connected to a control circuit of the sensor through a high-resistance state;
the control circuit judges whether the detection electrode is submerged or contacted by water or not by detecting the change of the voltage value on the detection electrode or the change of the current between the detection electrode and the voltage balance electrode;
obtaining the water level or the water quantity through the position of the predetermined detection electrode;
the sensor includes: plate electrode and sensor housing, sensor housing include the front panel and the back shroud of mutual lock, and it has the installation cavity of inlet opening to open from top to bottom to form behind front panel and the back shroud lock, the plate electrode is installed in the installation cavity, be equipped with the control circuit who is used for control electrode board in the front panel, be equipped with on the front panel with the metal contact that control circuit connects.
2. The method for measuring the liquid level in the water tank according to claim 1, wherein the step of embedding the sensor on the side wall of the water tank comprises the following steps:
a mounting hole is formed in the side wall of the water tank;
the sensor is hermetically installed inside the water tank through the installation hole, and the detection end of the sensor is arranged in the water tank and used for measuring the height of the liquid level in the water tank.
3. The method for measuring the liquid level in the water tank according to claim 1, wherein a mounting opening is formed in the side wall of the water tank, an open circular boss is arranged on the front panel, a metal contact is arranged in the circular boss, and when the front panel is mounted on the water tank, the circular boss penetrates out of the mounting opening.
4. A method for measuring a liquid level in a water tank according to claim 2, wherein the sensor comprises: plate electrode and sensor housing are equipped with protruding installation cavity of just opening the inlet opening from top to bottom on the sensor housing, the plate electrode is installed in the installation cavity, be equipped with the control circuit who is used for control electrode board in the sensor housing, the sensor housing be keep away from one side of installation cavity be equipped with the metal contact that control circuit connects.
5. The method for measuring the liquid level in the water tank as claimed in any one of claims 2 to 4, wherein the front panel and the mounting opening and the mounting hole of the water tank are sealed by waterproof rubber rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110730387.6A CN113440073B (en) | 2021-06-29 | 2021-06-29 | Method for measuring liquid level in water tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110730387.6A CN113440073B (en) | 2021-06-29 | 2021-06-29 | Method for measuring liquid level in water tank |
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| Publication Number | Publication Date |
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| CN113440073A CN113440073A (en) | 2021-09-28 |
| CN113440073B true CN113440073B (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110730387.6A Active CN113440073B (en) | 2021-06-29 | 2021-06-29 | Method for measuring liquid level in water tank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114947640B (en) * | 2022-05-07 | 2024-04-26 | 北京顺造科技有限公司 | Liquid level detection method of surface cleaning equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007029210A (en) * | 2005-07-25 | 2007-02-08 | Matsushita Electric Ind Co Ltd | Rice cooker |
| CN201285310Y (en) * | 2008-10-13 | 2009-08-05 | 李凌 | Circuit structure used for water level transducer |
| CN205958066U (en) * | 2016-08-04 | 2017-02-15 | 珠海百亚电子科技有限公司 | Water level transducer |
| CN207472377U (en) * | 2017-12-12 | 2018-06-08 | 佛山市云米电器科技有限公司 | A kind of water level sensor |
| CN212066631U (en) * | 2020-02-22 | 2020-12-04 | 深圳市杉川机器人有限公司 | Water tank water level detection device, floor sweeping robot and control system thereof |
| CN212574808U (en) * | 2020-08-21 | 2021-02-23 | 苏州三六零机器人科技有限公司 | Water level detection device and robot of sweeping floor |
-
2021
- 2021-06-29 CN CN202110730387.6A patent/CN113440073B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007029210A (en) * | 2005-07-25 | 2007-02-08 | Matsushita Electric Ind Co Ltd | Rice cooker |
| CN201285310Y (en) * | 2008-10-13 | 2009-08-05 | 李凌 | Circuit structure used for water level transducer |
| CN205958066U (en) * | 2016-08-04 | 2017-02-15 | 珠海百亚电子科技有限公司 | Water level transducer |
| CN207472377U (en) * | 2017-12-12 | 2018-06-08 | 佛山市云米电器科技有限公司 | A kind of water level sensor |
| CN212066631U (en) * | 2020-02-22 | 2020-12-04 | 深圳市杉川机器人有限公司 | Water tank water level detection device, floor sweeping robot and control system thereof |
| CN212574808U (en) * | 2020-08-21 | 2021-02-23 | 苏州三六零机器人科技有限公司 | Water level detection device and robot of sweeping floor |
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| CN113440073A (en) | 2021-09-28 |
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