CN216645511U

CN216645511U - Liquid level monitoring device

Info

Publication number: CN216645511U
Application number: CN202122249976.0U
Authority: CN
Inventors: 鲁禹
Original assignee: Huizhou Sanhua Industrial Co ltd
Current assignee: Huizhou Sanhua Industrial Co ltd
Priority date: 2021-09-16
Filing date: 2021-09-16
Publication date: 2022-05-31
Anticipated expiration: 2031-09-16

Abstract

The utility model discloses a liquid level monitoring device, which comprises a power supply module, an MCU control module and a measurement module, wherein the power supply module is used for providing power for the MCU control module and the measurement module; the measuring module comprises a measuring resistor and a detecting metal sheet, the detecting metal sheet is electrically connected with the MCU control module and one end of the measuring resistor respectively, and the other end of the measuring resistor is electrically connected with the power supply module. According to the utility model, the measuring resistor and the detecting metal sheet are arranged on the measuring module, the detecting metal sheet can be attached to the outer wall of the bottle to be detected, and then the measuring resistor and the MCU control module can be used for measuring whether the change of liquid on the bottle to be detected is an empty bottle or not in real time, and when the empty bottle is found, a prompt or an alarm is sent outwards. The utility model can realize contactless monitored liquid, has low power consumption and low cost, is suitable for most non-metal bottles filled with liquid, and can meet the requirement of monitoring liquid level of most electrical appliances by using the metal elastic sheet structure in contact with the bottle wall.

Description

Liquid level monitoring device

Technical Field

The utility model relates to the field of small household appliances, in particular to a liquid level monitoring device.

Background

Devices with liquids, such as electric mosquito coils, liquid fragrances, fish tanks, fountain views, etc., are often used today if automatic control or level state alerting is to be achieved, for example: the perfume of champignon is used up and is reminded, just need to use liquid sensor, and the simplest method is just to survey with metal electrode, but some devices can not be installed, for example liquid electric mosquito repellent incense etc. just need come non-contact detection with response or light etc. and know at present and all need special IC to detect, and the cost is than higher, and current liquid level detection circuit is also more complicated moreover, and the consumption is also relatively great.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provides a liquid level monitoring device which can realize non-contact monitored liquid and has low power consumption, low cost and higher reliability; the liquid level monitoring device is suitable for most of bottles filled with liquid made of nonmetal materials, and the used metal elastic sheet structure is in contact with the wall of the bottle, so that the liquid level monitoring device can be used for most of electric appliances.

The purpose of the utility model is realized by the following technical scheme:

a liquid level monitoring device comprising: the power supply module is used for providing power for the MCU control module and the measuring module;

the measuring module comprises a measuring resistor and a detecting metal sheet, the detecting metal sheet is electrically connected with the MCU control module and one end of the measuring resistor respectively, and the other end of the measuring resistor is electrically connected with the power supply module.

Preferably, the liquid level monitoring device further comprises a peripheral circuit module, one end of the peripheral circuit module is used for accessing an input power supply, and the other end of the peripheral circuit module is connected with the control end of the MCU control module.

Preferably, the peripheral circuit module comprises an indicator light unit, a warning unit and a power-off unit, and the indicator light unit, the warning unit and the power-off unit are all electrically connected with the MCU control module.

Preferably, the liquid level monitoring device further comprises a plug terminal, and the plug terminal is electrically connected with the input end of the power supply module.

Preferably, the detection metal sheet is any one of a metal sheet, a metal spray and a tin foil sticker.

Preferably, the measuring module further comprises a connecting metal sheet, and the connecting metal sheet is abutted with the detecting metal sheet.

Preferably, the liquid level monitoring device further comprises a control circuit board, the power supply module, the MCU control module and the measuring resistor are arranged on the control circuit board, and the connecting metal sheet is electrically connected with the control circuit board.

Preferably, the connection metal sheet is provided with a convex insertion part, the control circuit board is provided with an insertion hole, and the convex insertion part of the connection metal sheet is embedded in the insertion hole.

Preferably, the connecting metal sheet has a bending portion, and an upper surface of the bending portion abuts against the detecting metal sheet.

Preferably, the liquid level monitoring device further comprises a storage module, and the storage module is electrically connected with the MCU control module. The MCU control module is a singlechip.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

the utility model relates to a liquid level monitoring device, which is characterized in that a measuring resistor and a detecting metal sheet are arranged on a measuring module, the detecting metal sheet can be attached to the outer wall of a bottle to be detected, whether the change of liquid on the bottle to be detected is an empty bottle can be measured in real time through the measuring resistor and an MCU control module, and when the empty bottle is found, a prompt or an alarm is sent outwards. The utility model can realize contactless monitored liquid, and has low power consumption, low cost and higher reliability; and be applicable to the bottle that liquid is adorned to most non-metallic material, the metal shrapnel structure that uses contacts with the bottle wall, can satisfy in most electrical apparatus monitoring liquid level.

Drawings

FIG. 1 is a block diagram of a fluid level monitoring device according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the liquid level monitoring device of the embodiment shown in FIG. 1;

FIG. 3 is a schematic structural view of a fluid level monitoring apparatus of another embodiment shown in FIG. 1;

FIG. 4 is a graph of simulation results for an inductive capacitance of 9 pF;

fig. 5 is a graph of simulation results for an inductive capacitance of 8 pF.

Detailed Description

To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The application relates to the field of circuits and structural devices, in particular to a small household appliance device with a liquid level monitoring function and a low-power-consumption liquid level monitoring device, and especially with bottled liquid.

Referring to fig. 1, a liquid level monitoring device includes: the device comprises a power supply module 100, an MCU control module 200 and a measurement module 300, wherein the power supply module is used for supplying power to the MCU control module and the measurement module; the liquid level monitoring device further comprises a storage module 400, and the storage module is electrically connected with the MCU control module. It should be noted that the MCU control module 200 is configured to obtain a detection value of the measurement module 300, and then send a prompt message; the measuring module 300 is used for measuring whether the bottle to be measured is empty or not in real time. The storage module 400 is used for storing a calibration value of a product before leaving a factory. In this embodiment, the MCU control module is a single chip microcomputer. The most common IO type single chip microcomputer can be selected, the oscillation threshold value is just the threshold value of the IO of the single chip microcomputer, and the crystal oscillation frequency is larger than 4 MHz. In addition, although the power module 100 detects the capacitor of the pF stage, it does not need to supply power precisely, and may be a rc step-down circuit, a switching power supply, a battery power supply, etc.,

referring to fig. 2, the measurement module 300 includes a measurement resistor R and a detection metal plate 310, the detection metal plate 310 is electrically connected to the MCU control module 200 and one end of the measurement resistor, respectively, and the other end of the measurement resistor is electrically connected to the power module 100. It should be noted that the detection metal sheet 310 is used to be attached to the outer surface of the bottle 10 to be detected, and through the measuring resistor and the MCU control module, it can be measured whether the liquid change on the bottle is an empty bottle in real time, and when the empty bottle is found, a prompt or alarm is given outwards. In this embodiment, the detection metal sheet is any one of a metal sheet, a metal coating, and a tin foil sticker. The "induced capacitance" in fig. 1 refers to this portion. The embodiment adopts the tinfoil sticker, pastes at the plastic casing inner wall, and the shell outside is exactly glass bottle perfume. The detection metal sheet is equivalent to a capacitor C to be detected.

Specifically, the measuring resistor only needs one resistor except for the detection metal sheet, and the most common resistor is selected.

Referring to fig. 1, the liquid level monitoring apparatus further includes a peripheral circuit module 500, one end of the peripheral circuit module is used for accessing an input power supply, and the other end of the peripheral circuit module is connected to the control end of the MCU control module. Specifically, the peripheral circuit module comprises an indicator light unit, a warning unit and a power-off unit, and the indicator light unit, the warning unit and the power-off unit are all electrically connected with the MCU control module. Thus, the power-off unit is used for playing the role of power-off by arranging the indicator light unit and the warning unit to play the role of prompting,

referring to fig. 1, the liquid level monitoring device further includes a plug terminal 600 electrically connected to the input terminal of the power module. So, through setting up plug terminal 600, conveniently realize outside connection.

Referring to fig. 3, the measuring module further includes a connecting metal sheet 320, and the connecting metal sheet is abutted to the detecting metal sheet. Thus, the connection metal piece 320 is provided to connect the circuit board and the detection metal piece. The connection of surveying sheetmetal and PCBA for reduce the requirement to surveying the sheetmetal, connect when the assembly through the metal shell fragment, have simple structure reliable characteristics.

Referring to fig. 3, the liquid level monitoring device further includes a control circuit board 700, the power module, the MCU control module and the measuring resistor are disposed on the control circuit board, and the connecting metal sheet is electrically connected to the control circuit board. So, through setting up control circuit board, can the erection joint sheetmetal to can also weld power module, MCU control module and measurement resistance above, play the effect of electricity connection.

It should be noted that the connection metal sheet 320 has a protruding insertion part 321, the control circuit board is provided with an insertion hole, and the protruding insertion part of the connection metal sheet is embedded in the insertion hole. Thus, by providing the convex insertion portion 321, the connection metal piece can be inserted into the control circuit board.

Specifically, the connecting metal sheet has a bending portion 322, and an upper surface of the bending portion abuts against the detecting metal sheet. So, then can realize being connected with the detection sheetmetal through setting up the kink.

In this embodiment, since the sensing capacitance is very small, the period of a single waveform is too short to be measured by time, and is calculated by the number of oscillation waveforms within a fixed time. The time is selected according to the specific product and the required reaction time;

because the change in liquid level has little effect on the capacitance, and in addition, this approach is susceptible to external disturbances, filtering is required as follows: 1. setting a range: out of this range, denoted interference, discard; 2. intercepting an effective part: the capacitance value changes very little, and then need to accumulate a relatively large number, for example, the empty bottle and full bottle change is 0.5%, the liquid level scale is 10, and then consider other errors and reliabilities, this number reaches at least 10000, but the change range is 9950-10000, the final calculated number is-9950; 3. the filtering data can be properly increased when the liquid level changes slowly, and the filtering data needs to be decreased when the liquid level changes rapidly so as to increase the reaction speed.

The simulation was performed based on the measured values (empty bottle inductive capacitance 8pF, full bottle inductive capacitance 9 pF). Fig. 4 shows a simulated waveform of 8pF, which is 30030 after passing through a filtering algorithm. Fig. 5 shows a simulation waveform of 9pF, which is 27308 after passing through the filtering algorithm.

In order to reduce the requirements on peripheral circuit modules and adapt to more low-cost products, a storage module is specially added, the products are calibrated before leaving factories, and data is stored, so that the requirements on devices are reduced, and the requirements on assembly precision are also greatly reduced.

The above embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A liquid level monitoring device, comprising: the power supply module is used for providing power for the MCU control module and the measuring module;

2. The liquid level monitoring device according to claim 1, further comprising a peripheral circuit module, wherein one end of the peripheral circuit module is used for connecting an input power supply, and the other end of the peripheral circuit module is connected with the control end of the MCU control module.

3. The liquid level monitoring device of claim 2, wherein the peripheral circuit module comprises an indicator light unit, a warning unit and a power-off unit, and the indicator light unit, the warning unit and the power-off unit are all electrically connected with the MCU control module.

4. The liquid level monitoring device of claim 1 or 2, further comprising a plug terminal electrically connected to the input of the power module.

5. The fluid level monitoring device of claim 1, wherein the probe metal sheet is any one of a metal foil, a metal spray, and a tin foil sticker.

6. The fluid level monitoring device of claim 1, wherein the measurement module further comprises a connecting metal sheet abutting the probing metal sheet.

7. The liquid level monitoring device of claim 6, further comprising a control circuit board, wherein the power module, the MCU control module and the measuring resistor are disposed on the control circuit board, and the connecting metal sheet is electrically connected to the control circuit board.

8. The liquid level monitoring device of claim 7, wherein the connecting metal plate has a protruding insertion portion, the control circuit board has an insertion hole, and the protruding insertion portion of the connecting metal plate is inserted into the insertion hole.

9. The liquid level monitoring device according to any one of claims 6 to 8, wherein the connecting metal sheet has a bent portion, and an upper surface of the bent portion abuts against the detecting metal sheet.

10. The fluid level monitoring device of claim 1, further comprising a memory module electrically connected to the MCU control module.