CN209979021U - Liquid level sensor and electric appliance with same - Google Patents
Liquid level sensor and electric appliance with same Download PDFInfo
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- CN209979021U CN209979021U CN201920592603.3U CN201920592603U CN209979021U CN 209979021 U CN209979021 U CN 209979021U CN 201920592603 U CN201920592603 U CN 201920592603U CN 209979021 U CN209979021 U CN 209979021U
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Abstract
The utility model relates to the technical field of water level detection, in particular to a liquid level sensor and an electric appliance with the liquid level sensor, wherein the liquid level sensor comprises a metal probe which is used for outputting capacitance signals after liquid is inserted, and the capacitance signals change along with the change of the liquid level of the liquid; the liquid level processing module comprises a detection circuit, and the detection circuit is used for converting the capacitance signal into a digital signal; a box body accommodating the liquid level processing module; and the power supply and communication module is used for supplying power to the liquid level processing module and communicating with the outside. The utility model provides a this kind of level sensor and have this level sensor's electrical apparatus, level sensor exports digital signal outward to and utilize the box body to protect electronic component, and two kinds of modes combine to help improving level sensor's interference killing feature, and the measuring result output is stable, and the precision is higher.
Description
Technical Field
The utility model relates to a water level detection technical field especially relates to a level sensor and have this level sensor's electrical apparatus.
Background
The capacitance liquid level sensor is one of liquid level sensors, a probe is inserted into detection liquid during detection, a capacitance value detected by the probe changes along with the change of the water level, and the liquid level height is obtained according to the change value of the capacitance. If the sensor is used for detecting the low liquid level, the water level detection module outputs a low water level signal after the liquid level of the water tank reaches the lowest water level line; or the sensor is used for continuous water level detection to continuously detect the water level in the water tank, and the water level detection module sends real-time water level information.
In the existing capacitive liquid level sensor, an insulating plastic support is utilized to fix a probe, one end of the probe is used for being inserted into liquid, and the other end of the probe is a capacitive contact used for leading out an electric signal on the probe through a lead or a hard contact.
The inventor discovers that the capacitance type liquid level sensor outputs capacitance analog quantity signals which are easy to be interfered in the process of realizing the invention; if handle probe capacitance signal output through the lead wire mode, parasitic capacitance on the lead wire then to and lead wire installation is fixed can all influence output capacitance's stability, if adopt hard contact mode, then the contact exposes, and the water droplet falls to contact or humidity and all can greatly influence output capacitance.
Therefore, the existing capacitance type liquid level sensor is easy to cause liquid level value errors during use, and the accuracy and the reliability of the detection of the liquid level sensor are poor.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a level sensor and have this level sensor's electrical apparatus reaches level sensor interference killing feature reinforce, purpose that measurement accuracy is high.
In order to achieve the above object, the present invention provides a liquid level sensor, comprising a metal probe for outputting a capacitance signal after inserting a liquid, wherein the capacitance signal varies with the liquid level of the liquid; the liquid level processing module comprises a detection circuit, and the detection circuit is used for converting the capacitance signal into a digital signal; the box body accommodates the liquid level processing module; and the power supply and communication module is used for providing power for the liquid level processing module and communicating with the outside.
Optionally, the power and communication module is a power and communication contact, and the power and communication contact is arranged on the outer side of the box body and used for receiving external power supply and outputting a digital signal representing the liquid level.
Optionally, the power supply and communication module includes a wireless charging unit and a wireless communication unit, wherein the wireless charging unit is configured to receive external power in a wireless manner and provide power to the liquid level processing module and the wireless communication unit, and the wireless communication unit is configured to transmit the digital signal provided by the detection circuit to the outside in a wireless manner.
Optionally, the wireless communication unit is an infrared module, a bluetooth module, a wifi module or a 2.4G module.
Optionally, the metal probe comprises two probes arranged in parallel.
Optionally, the cartridge is a sealed cartridge.
The utility model also provides an electrical apparatus, including above-mentioned level sensor.
Optionally, the appliance is a water dispenser or a humidifier.
The utility model provides a liquid level sensor and have this liquid level sensor's electrical apparatus, during the use, utilize the capacitance value of metal probe measurement current liquid level, the circular telegram after metal probe inserts in liquid promptly, metal probe output capacitance value, detection circuitry receives this capacitance signal, and turns into digital signal with it, utilizes power and communication module to export digital signal to outside master control MCU; wherein, the liquid level processing module is arranged in the box body, and the box body plays a role in protecting the liquid level processing module.
This level sensor and have this level sensor's electrical apparatus, level sensor outwards exports digital signal to and utilize the box body to protect electronic component, two kinds of modes combine, help improving level sensor's interference killing feature, and the measuring result output is stable, and the precision is higher.
Drawings
The accompanying drawings are included to provide a better understanding of the present invention and are not intended to constitute an undue limitation on the invention. Wherein:
FIG. 1 is one of the schematic structural views of a liquid level sensor provided by the present invention;
fig. 2 is a second schematic structural diagram of the liquid level sensor provided by the present invention.
Wherein, 1-metal probe; 2-a liquid level processing module; 3-a box body; 4-power and communication contacts; 5-a wireless charging unit; 6-wireless communication unit.
Detailed Description
Exemplary embodiments of the invention are described below with reference to the accompanying drawings, in which various details of embodiments of the invention are included to assist understanding, and which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
As shown in fig. 1 and 2, a liquid level sensor includes a metal probe 1 for outputting a capacitance signal after inserting a liquid, the capacitance signal varying with a change in a liquid level of the liquid; the liquid level processing module 2, the liquid level processing module 2 includes the detection circuit, the detection circuit is used for turning the capacitive signal into the digital signal; the box body 3 is used for accommodating the liquid level processing module 2; and the power supply and communication module is used for supplying power to the liquid level processing module 2 and communicating with the outside.
In use, the metal probe 1 is inserted into a liquid and energized, preferably, the metal probe 1 comprises two probes arranged in parallel. According to a capacitance calculation formula: c ═ S/d, where ∈ is the dielectric constant of the liquid, d is the distance between the two probes, both ∈ and d are fixed values, S is the contact area between the metal probe 1 and the liquid, and S is proportional to the height of the liquid level, so that the height of the liquid level can be determined from the capacitance value C.
In order to reduce external interference, the liquid level sensor in the embodiment mainly adopts the following improvement measures that firstly, a liquid level processing module 2 is additionally arranged, the liquid level processing module 2 is connected with a metal probe 1, a detection circuit comprises a PCB circuit board, an analog-to-digital conversion circuit is arranged on the circuit board, the detection circuit receives a capacitance signal and converts the capacitance signal into a digital signal, and the liquid level sensor outputs the digital signal outwards; the circuit board holds box body 3 outward, can physically play the guard action to detection circuitry, avoids external debris, influences detection circuitry's normal use such as water, dust.
The detection circuit needs to be provided with a power supply and a communication module, the power supply supplies power to the detection circuit, and the communication module transmits the digital signal. The utility model discloses an among the embodiment, power and communication all can adopt wired or wireless mode to dispose.
The wired mode is adopted, the power supply and communication module is a power supply and communication contact 4, and the power supply and communication contact 4 is arranged on the outer side of the box body 3 and used for receiving external power supply and outputting a digital signal representing the liquid level. The power supply and communication contact 4 is connected with the detection circuit, is arranged outside the box body 3 and is used for connecting an external power supply and a main control MCU. The wired connection mode can realize stable charging and data transmission, and ensure the stable operation of the related system of the liquid level sensor.
The power supply and communication module comprises a wireless charging unit 5 and a wireless communication unit 6 in a wireless mode, wherein the wireless charging unit 5 is used for receiving external power supply in a wireless mode and supplying power to the liquid level processing module 2 and the wireless communication unit 6, and the wireless communication unit 6 is used for transmitting digital signals provided by the detection circuit to the outside in a wireless mode.
The wireless charging unit 5 comprises a power receiving module connected with the detection circuit, the power receiving module is arranged inside the box body 3, a power transmitting module is arranged outside the box body 3, and the power receiving module and the power transmitting module are powered on, so that power supply to the detection circuit and the wireless communication unit 6 is realized. The wireless communication unit 6 transmits digital signals to an external main control MCU in a wireless manner. Preferably, the wireless communication unit 6 is an infrared module, a bluetooth module, a wifi module or a 2.4G module. The wireless mode is little influenced by external factors, and the installation is more flexible.
Liquid level sensor uses in the operational environment who has water, on avoiding water mistake to go into liquid level sensor, arouses phenomenons such as short circuit, the utility model discloses in, can set up box body 3 into sealed box body 3, it can compromise waterproof performance, further improves liquid level sensor's interference killing feature.
The utility model also provides an electrical apparatus, including above-mentioned level sensor, the electrical apparatus can be the water dispenser, humidifier etc. have water storage container, need survey the electrical apparatus of liquid level.
The utility model provides a level sensor has stronger interference killing feature, consequently can provide the measuring result of high accuracy, when using in the electrical apparatus, accurate to liquid level altitude measurement, ensures the normal use of electrical apparatus.
The above detailed description does not limit the scope of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions can occur, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A liquid level sensor, comprising,
the metal probe is used for outputting a capacitance signal after being inserted into liquid, and the capacitance signal changes along with the change of the liquid level of the liquid;
the liquid level processing module comprises a detection circuit, and the detection circuit is used for converting the capacitance signal into a digital signal;
a box body accommodating the liquid level processing module;
and the power supply and communication module is used for providing power for the liquid level processing module and communicating with the outside.
2. The fluid level sensor of claim 1, wherein the power and communication module is a power and communication contact disposed on an exterior side of the cartridge body for receiving an external power supply and outputting a digital signal indicative of fluid level.
3. The fluid level sensor of claim 1, wherein the power and communication module comprises a wireless charging unit and a wireless communication unit, wherein,
the wireless charging unit is used for receiving external power supply in a wireless mode and providing power to the liquid level processing module and the wireless communication unit,
the wireless communication unit is used for transmitting the digital signal provided by the detection circuit to the outside in a wireless mode.
4. The liquid level sensor of claim 3, wherein the wireless communication unit is an infrared module, a Bluetooth module, a wifi module, or a 2.4G module.
5. The fluid level sensor according to any one of claims 1 to 4, wherein the metal probe comprises two probes arranged in parallel.
6. The level sensor of any one of claims 1 to 4, wherein the cartridge is a sealed cartridge.
7. An electrical appliance, characterized in that it comprises a level sensor according to any one of claims 1 to 6.
8. The appliance of claim 7, wherein the appliance is a water dispenser or a humidifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920592603.3U CN209979021U (en) | 2019-04-26 | 2019-04-26 | Liquid level sensor and electric appliance with same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920592603.3U CN209979021U (en) | 2019-04-26 | 2019-04-26 | Liquid level sensor and electric appliance with same |
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| CN209979021U true CN209979021U (en) | 2020-01-21 |
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| CN201920592603.3U Active CN209979021U (en) | 2019-04-26 | 2019-04-26 | Liquid level sensor and electric appliance with same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945348A (en) * | 2021-01-25 | 2021-06-11 | 山东大学 | Wireless intelligent sensor and application thereof |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945348A (en) * | 2021-01-25 | 2021-06-11 | 山东大学 | Wireless intelligent sensor and application thereof |
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Effective date of registration: 20230902 Address after: Room 6317, 3rd Floor, Building 6, No. 18 Xueqing Road, Haidian District, Beijing, 100083 Patentee after: Beijing Weijia Technology Co.,Ltd. Address before: 100085 11th floor, China Resources colorful city office building, 68 Qinghe middle street, Haidian District, Beijing Patentee before: BEIJING SMARTMI TECHNOLOGY Co.,Ltd. |
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