CN117705225A - Liquid level sensor, liquid level detection device and electronic equipment - Google Patents

Liquid level sensor, liquid level detection device and electronic equipment Download PDF

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Publication number
CN117705225A
CN117705225A CN202311626956.8A CN202311626956A CN117705225A CN 117705225 A CN117705225 A CN 117705225A CN 202311626956 A CN202311626956 A CN 202311626956A CN 117705225 A CN117705225 A CN 117705225A
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CN
China
Prior art keywords
liquid level
level sensor
sensing
shield
circuit board
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311626956.8A
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Chinese (zh)
Inventor
戈洪凯
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Shenzhen Xiancheng Technology Co ltd
Original Assignee
Shenzhen Xiancheng Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Xiancheng Technology Co ltd filed Critical Shenzhen Xiancheng Technology Co ltd
Priority to CN202311626956.8A priority Critical patent/CN117705225A/en
Publication of CN117705225A publication Critical patent/CN117705225A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • G01F23/263—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 by measuring variations in capacitance of capacitors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings
    • H05K9/002—Casings with localised screening

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

The application discloses a liquid level sensor, liquid level detection device and electronic equipment belongs to detection technical field. The liquid level sensor comprises a circuit board, the circuit board comprises a top layer, a signal layer and a bottom layer, the top layer is provided with a first sensing piece and a first shielding piece, the bottom layer is provided with a second shielding piece opposite to the first shielding piece and the first sensing piece at intervals, the signal layer is provided with a wiring, the wiring is electrically connected with the first sensing piece, and the wiring is arranged between the first shielding piece and the second shielding piece. The liquid level sensor that this application provided, top layer and bottom are equipped with first shield and second shield respectively, walk the line setting between first shield and second shield to keep apart the line in the shield, prevent to walk the line and produce induction capacitance, make liquid level sensor's capacitance measurement value not receive the influence of walking the line, can improve liquid level detection's detection precision.

Description

Liquid level sensor, liquid level detection device and electronic equipment
Technical Field
The present invention relates to the field of detection technologies, and in particular, to a liquid level sensor, a liquid level detection device, and an electronic apparatus.
Background
The capacitive liquid level sensor is used for judging the liquid level sensor by utilizing the difference of capacitance values sensed by the liquid level sensing surface when liquid exists or does not exist. Adopt the wire to connect between level sensor sensing surface and the treater, the distance of level sensor sensing surface to the treater is generally longer, and the wire because be the material of metal, can receive the influence of being detected liquid, is equivalent to the inductance capacitance who has increased the sensing surface, even the liquid does not reach level sensor sensing surface, also can lead to the sensing capacitance that the treater department received to change, leads to level sensor's detection precision lower.
Disclosure of Invention
The application provides a liquid level sensor, liquid level detection device and electronic equipment, can solve the lower technical problem of liquid level sensor detection precision.
For solving above-mentioned technical problem, this application provides a level sensor on the one hand, and level sensor includes the circuit board, and the circuit board is equipped with first sensing piece and first shield including top layer, signal layer and the bottom of range upon range of setting, the top layer be equipped with first shield and first sensing piece interval opposition's second shield, the signal layer is equipped with the wiring, the wiring is connected with first sensing piece electricity, the wiring setting is between first shield and second shield.
The utility model provides a liquid level detection device on the other hand, liquid level detection device includes level sensor and casing as described above, and level sensor holding is in the casing, and the clearance between shells inner wall and the level sensor is irritated and is equipped with the filling medium.
The application also provides electronic equipment, and electronic equipment includes liquid level detection device and holding chamber as described above, and liquid level detection device installs in the holding intracavity.
The liquid level sensor that this application provided, top layer and bottom are equipped with first shield and second shield respectively, walk the line setting between first shield and second shield to keep apart the line in the shield, prevent to walk the line and produce induction capacitance, make liquid level sensor's capacitance measurement value not receive the influence of walking the line, can improve liquid level detection's detection precision.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of an embodiment of a fluid level sensor provided herein;
FIG. 2 is a schematic cross-sectional view of another embodiment of a fluid level sensor provided herein;
FIG. 3 is a schematic view of an embodiment of a liquid level sensor according to the present application along a view angle;
FIG. 4 is a schematic view of another embodiment of a liquid level sensor according to the present application along a view angle;
FIG. 5 is a schematic view of a further embodiment of a fluid level sensor according to the present application, taken from a perspective;
FIG. 6 is a schematic view of an embodiment of a liquid level detection device provided herein;
FIG. 7 is a schematic view of an exploded structure of an embodiment of a liquid level detection device provided herein;
FIG. 8 is a schematic cross-sectional view of an embodiment of a liquid level detection apparatus provided herein;
fig. 9 is a schematic structural diagram of an embodiment of an electronic device provided in the present application.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is specifically noted that the following examples are only for illustrating the present invention, but do not limit the scope of the present invention. Likewise, the following examples are only some, but not all, of the examples of the present invention, and all other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the present invention.
In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. The terms "first," "second," "third," and the like in the embodiments of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", and "a third" may explicitly or implicitly include at least one such feature. All directional indications (such as up, down, left, right, front, back … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular gesture (as shown in the drawings), and if the particular gesture changes, the directional indication changes accordingly. The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may alternatively include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The application provides a liquid level sensor. Referring to FIG. 1, a fluid level sensor 100 may include a circuit board 10. The circuit board 10 is a multi-layer board, and the circuit board 10 may include a top layer 11, a signal layer 12, and a bottom layer 13 that are stacked. Each layer is provided with an insulating medium 14, and the insulating medium 14 can be epoxy glass cloth, phenolic resin glass cloth or the like. The top layer 11 is provided with a first inductor 111 and a first shield 112, and the bottom layer 13 is provided with a second shield 132 spaced apart from and opposite to the first shield 112 and the first inductor 111. The signal layer 12 is provided with a trace 121, the trace 121 is electrically connected with the first sensing element 111, and the trace 121 can transmit a signal detected by the first sensing element 111. The first sensing element 111, the first shielding element 112, and the second shielding element 132 may be made of metal. The first sensing member 111 and the second shielding member 132 are opposite to each other at intervals to form a capacitor, when the liquid level sensor 100 is placed in the detected liquid, the dielectric constant of the capacitor is changed by the change of the liquid level outside the liquid level sensor 100, and the first sensing member 111 generates a signal for sensing the change of the capacitor, and the signal is transmitted through the wiring 121. The trace 121 is disposed between the first shielding member 112 and the second shielding member 132, so as to prevent the trace 121 from generating a sensing capacitance, thereby reducing the influence of the trace 121 on the liquid level detection accuracy.
The liquid level sensor 100 that this application provided, top layer 11 and bottom 13 are equipped with first shield 112 and second shield 132 respectively, walk line 121 setting between first shield 112 and second shield 132 to keep apart line 121 in the shield, prevent to walk line 121 and produce induced capacitance, make the electric capacity measurement value of liquid level sensor 100 not receive the influence of walking line 121, can improve liquid level detection's detection precision.
The top layer 11 and the bottom layer 13 of the circuit board 10 are opposite, that is, the first sensing element 111 may be disposed on the top layer 11 or may be disposed on the bottom layer 13, and the first sensing element 111 is disposed on the top layer 11 will be described below as an example. In an embodiment, as shown in fig. 2, the bottom layer 13 is provided with a second sensing element 131, where the second sensing element 131 is disposed at a position corresponding to the first sensing element 111, and the second sensing element 131 is electrically connected to the trace 121. By providing the second sensing element 131 on the bottom layer 13, the second sensing element 131 and the first sensing element 111 are arranged to be opposite to each other at intervals to form a capacitor, and compared with the capacitor formed by arranging the first sensing element 111 and the second shielding element 132 to be opposite to each other at intervals, the capacitance of the capacitor can be increased, so that the liquid level sensor 100 is more sensitive to the detection of the external liquid level change, and the detection precision can be improved.
The first and second shields 112, 132 may be a cover or shield, such as silver paste, shielding films, etc., formed over the insulating medium 14. In an embodiment, the top layer 11 and the bottom layer 13 are provided with copper coating, the copper coating forms a first shielding member 112 and a first sensing member 111 on the top layer 11, the first shielding member 112 is enclosed on the periphery of the first sensing member 111, and the copper coating forms a second shielding member 132 on the bottom layer 13. When the bottom layer 13 is provided with the second sensing element 131, the second sensing element 131 may be disposed similarly to the first sensing element 111, that is, the second shielding element 132 and the second sensing element 131 are formed by copper coating. The copper-clad shield and the inductor are provided, so that the processing technology of the circuit board 10 can be simplified, and the cost can be reduced.
In one embodiment, as shown in fig. 1, the liquid level sensor 100 further includes a processor 20, and the processor 20 is connected to the first sensing element 111 through a trace 121. The processor 20 is configured to process the signal detected by the first sensing element 111. The first and second shields 112, 132 may be connected to a ground port of the processor 20. The processor 20 may be integrated on the circuit board 10, i.e. the processor 20 is integrally provided with the circuit board 10; the processor 20 may also be disposed separately from the circuit board 10, i.e., the processor 20 is disposed outside the circuit board 10, which is not particularly limited herein. When the bottom layer 13 is provided with the second sensing element 131, the second sensing element 131 is connected with the processor 20 through the trace 121. The signal layer 12 in the middle layer may be provided with traces 121 on both sides of the insulating medium 14, i.e., the signal layer 12 may be a single layer or two layers. Accordingly, the traces 121 connected between the processor 20 and the first sensing element 111 and the second sensing element 131 may be disposed on one side of the signal layer 12, as shown in fig. 1; the traces 121 may also be disposed on opposite sides of the signal layer 12, as shown in fig. 2.
The first sensing element 111 may be arranged in a variety of ways. Experiments show that the setting number, shape and other parameters of the first sensing pieces 111 can be adjusted so that the liquid level sensor 100 meets different requirements of use situations. Referring to fig. 3, in one embodiment, the circuit board 10 is in an elongated shape, and the long edge of the circuit board 10 extends in the first direction. The first direction may be a direction in which the liquid level height of the liquid to be detected changes, that is, the extending direction of the long side of the circuit board 10 is the same as the direction in which the liquid level height of the liquid to be detected changes, so that the length of the circuit board 10 is shortest in the preset range, thereby reducing the cost of the circuit board 10. The number of first sensing elements 111 is two, and the two first sensing elements 111 are spaced apart at opposite ends of the top layer 11 in the first direction. A first sensing member 111 is disposed at each end of the top layer 11 to detect the lowest level and the highest level of the liquid to be detected, and the liquid level sensor 100 can be used in a device that needs to control the lowest level and the highest level. If the liquid level is lower than the lowest liquid level, dry heating can occur, so that the equipment is damaged; if the liquid level is higher than the maximum liquid level, liquid overflow may occur, which creates a safety hazard, and therefore the minimum and maximum liquid levels need to be monitored using the liquid level sensor 100 described above.
In one embodiment, as shown in fig. 4, the circuit board 10 is in an elongated shape, and the long edge of the circuit board 10 extends in the first direction. The number of the first sensing pieces 111 is greater than two, wherein the two first sensing pieces 111 are arranged at two opposite ends of the top layer 11 in the first direction at intervals, and a plurality of first sensing pieces 111 are arranged between the first sensing pieces 111 at intervals at two ends. By arranging the plurality of first sensing members 111 at intervals in the first direction, the liquid level variation at a plurality of positions can be monitored, and the liquid level sensor 100 described above can be applied to a device having a plurality of preset liquid level heights. Alternatively, the plurality of first sensing elements 111 may be equally spaced in the first direction.
Referring to fig. 5, in an embodiment, the circuit board 10 and the first sensing element 111 are elongated, and both the long side of the first sensing element 111 and the long side of the circuit board 10 extend along the first direction. The capacitance change in the first sensing member 111 has a one-to-one correspondence with the liquid level change of the liquid to be detected, so that the liquid level change of the liquid to be detected can be continuously monitored, thereby accurately reflecting the liquid level height of the liquid to be detected.
The application provides a liquid level detection device. Referring to fig. 6-8, the liquid level detecting device 500 includes the liquid level sensor 100 and the housing 510 as described above, wherein the liquid level sensor 100 is accommodated in the housing 510, and a filling medium 520 is filled in a gap between an inner wall of the housing 510 and the liquid level sensor 100. The housing 510 may be plastic or metal. The liquid level sensor 100 is packaged in the housing 510, and the housing 510 can provide protection for the liquid level sensor 100, so that the liquid level sensor 100 is protected from the liquid to be detected, and the service life of the liquid level sensor 100 can be prolonged. According to the shape of the liquid level sensor 100, when the liquid level sensor 100 is in an elongated shape, the housing 510 may be correspondingly cylindrical, for example, the housing 510 may be cylindrical, the liquid level sensor 100 is accommodated in the cylinder, and the outer periphery of the cylinder is closed, so as to prevent the liquid to be detected from invading into the housing 510 to affect the liquid level sensor 100.
Optionally, the filling medium 520 is glue, and after the glue is hardened, a gap between the inner wall of the housing 510 and the liquid level sensor 100 is filled; or other flowable or plastic material may be filled in the gap between the inner wall of the housing 510 and the level sensor 100, and the flowable or plastic material may harden to form the fill medium 520. Filling medium 520 is filled in the gap between the inner wall of the shell 510 and the liquid level sensor 100, on one hand, the filling medium 520 can fix the liquid level sensor 100, prevent the liquid level sensor 100 from shifting, and improve the reliability of the liquid level detection device 500; on the other hand, the filling medium 520 also has a protective effect, so that the liquid level sensor 100 is prevented from being corroded, and the service life of the liquid level detection device 500 is prolonged; in addition, the dielectric constant of the filling medium 520 is greater than that of air, for example, the relative dielectric constant of glue is generally 2.5-4.0, and wrapping the filling medium 520 around the circuit board 10 can improve the sensitivity of the liquid level sensor 100, thereby improving the detection accuracy of the liquid level detection device 500.
In one embodiment, as shown in fig. 8, a mounting portion 5121 is provided at one end of the housing 510 for mounting the liquid level detecting device 500. The liquid level detection device 500 may be mounted by screwing or clamping, and accordingly, the mounting portion 5121 may be provided with a screw thread, a clamping groove, or the like. The housing 510 may further be provided with a stopper 5122, the stopper 5122 being used to define the installation position of the liquid level detecting device 500, and the stopper 5122 may be a protrusion or a flange provided at the outer circumference of the housing 510. Alternatively, the housing 510 includes a first housing 511 and a second housing 512, the second housing 512 is connected to one end of the first housing 511, and the mounting portion 5121 and the stopper 5122 are provided on the second housing 512. The housing 510 is divided into the first housing 511 and the second housing 512, and the mounting portion 5121 and the limiting member 5122 are disposed on the second housing 512, so that the overall processing difficulty of the housing 510 can be reduced, and the processing efficiency can be improved.
Referring to fig. 8, in an embodiment, the liquid level detecting device 500 includes a fixing member 530, where the fixing member 530 is detachably connected to the mounting portion 5121, and the fixing member 530 is used for fixing the liquid level detecting device 500. The fixing member 530 may be a nut, a snap member, or other member having a fixing function, and the fixing member 530 is engaged with the mounting portion 5121 to fix the liquid level detecting apparatus 500.
The application provides an electronic device. Referring to fig. 9, the electronic device 700 includes the liquid level detecting apparatus 500 and the accommodating chamber 710 as described above, and the liquid level detecting apparatus 500 is installed in the accommodating chamber 710. The accommodating chamber 710 may accommodate a liquid, such as water, oil, etc., and the liquid level detecting device 500 may detect a liquid level of the liquid accommodated in the accommodating chamber 710. The electronic device 700 may also include other components such as a control motherboard. The above electronic device is only one embodiment of the present application, and other electronic devices having the liquid level detecting device 500 are also within the protection scope of the present application, and the specific structure inside the electronic device is not described again.
The application provides a liquid level sensor, liquid level detection device and electronic equipment has following beneficial effect at least:
1. the liquid level sensor 100 that this application provided, top layer 11 and bottom 13 are equipped with first shield 112 and second shield 132 respectively, walk line 121 setting between first shield 112 and second shield 132 to keep apart line 121 in the shield, prevent to walk line 121 and produce induced capacitance, make the electric capacity measurement value of liquid level sensor 100 not receive the influence of walking line 121, can improve liquid level detection's detection precision.
2. The bottom layer 13 is provided with the second sensing piece 131, and the second sensing piece 131 and the first sensing piece 111 are oppositely arranged at intervals to form a capacitor, so that the capacitance of the capacitor can be increased, the liquid level sensor 100 is more sensitive to detection of external liquid level change, and the detection precision can be improved.
3. The copper-clad shield and the inductor are provided, so that the processing technology of the circuit board 10 can be simplified, and the cost can be reduced.
4. The first sensing member 111 has various setting manners, can detect the lowest liquid level and the highest liquid level, or monitor the liquid level change of a plurality of positions, or continuously monitor the liquid level change of the liquid to be detected, and is suitable for various application scenarios.
5. The liquid level sensor 100 is accommodated in the shell 510, and a filling medium 520 is filled in a gap between the inner wall of the shell 510 and the liquid level sensor 100, so that on one hand, the filling medium 520 can fix the liquid level sensor 100, and the reliability of the liquid level detection device 500 is improved; on the other hand, the filling medium 520 also has a protective effect, so that the service life of the liquid level detection device 500 is prolonged; in addition, the packing medium 520 is wrapped around the outer circumference of the circuit board 10 to improve the sensitivity of the liquid level sensor 100, thereby improving the detection accuracy of the liquid level detection apparatus 500.
The foregoing description is only a partial embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent devices or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.

Claims (10)

1. The utility model provides a liquid level sensor, its characterized in that, liquid level sensor includes the circuit board, the circuit board is including top layer, signal layer and the bottom of range upon range of setting, the top layer is equipped with first sensing piece and first shield, the bottom be equipped with first shield and first sensing piece interval opposition's second shield, the signal layer is equipped with the line of walking, walk the line with first sensing piece electricity is connected, it is in to walk the line setting first shield with between the second shield.
2. The liquid level sensor according to claim 1, wherein the bottom layer is provided with a second sensing member, a setting position of the second sensing member corresponds to the first sensing member, and the second sensing member is electrically connected with the wiring.
3. The liquid level sensor of claim 1, wherein the top layer and the bottom layer are provided with copper-clad layers, the copper-clad layers form the first shielding piece and the first sensing piece on the top layer, the first shielding piece is arranged around the periphery of the first sensing piece, and the copper-clad layers form the second shielding piece on the bottom layer.
4. The fluid level sensor of claim 1, wherein the circuit board is elongated, the long edge of the circuit board extending in a first direction;
the number of the first induction pieces is two, and the two first induction pieces are distributed at two opposite ends of the top layer in the first direction at intervals.
5. The fluid level sensor of claim 1, wherein the circuit board is elongated, the long edge of the circuit board extending in a first direction;
the first sensing pieces are arranged in a number greater than two, wherein two first sensing pieces are arranged at two opposite ends of the top layer in the first direction at intervals, and a plurality of first sensing pieces are arranged between the first sensing pieces at intervals at two ends.
6. The fluid level sensor of claim 1, wherein the circuit board and the first sensing member are elongated, and the long side of the first sensing member and the long side of the circuit board each extend along a first direction.
7. The fluid level sensor of claim 1, wherein the fluid level sensor comprises a processor, the processor being connected to the first sensing member by the trace.
8. A liquid level detection device, characterized by comprising the liquid level sensor as claimed in any one of claims 1-7 and a housing, wherein the liquid level sensor is accommodated in the housing, and a gap between the inner wall of the housing and the liquid level sensor is filled with a filling medium.
9. The liquid level detecting device according to claim 8, wherein the liquid level detecting device includes a fixing member, a mounting portion is provided at one end of the housing, and the fixing member is detachably connected to the mounting portion to fix the liquid level detecting device.
10. An electronic device comprising a liquid level detection apparatus as claimed in any one of claims 8 to 9 and a housing chamber, said liquid level detection apparatus being mounted within said housing chamber.
CN202311626956.8A 2023-11-29 2023-11-29 Liquid level sensor, liquid level detection device and electronic equipment Pending CN117705225A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311626956.8A CN117705225A (en) 2023-11-29 2023-11-29 Liquid level sensor, liquid level detection device and electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311626956.8A CN117705225A (en) 2023-11-29 2023-11-29 Liquid level sensor, liquid level detection device and electronic equipment

Publications (1)

Publication Number Publication Date
CN117705225A true CN117705225A (en) 2024-03-15

Family

ID=90158036

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311626956.8A Pending CN117705225A (en) 2023-11-29 2023-11-29 Liquid level sensor, liquid level detection device and electronic equipment

Country Status (1)

Country Link
CN (1) CN117705225A (en)

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