CN217953610U - Non-contact liquid level switch - Google Patents
Non-contact liquid level switch Download PDFInfo
- Publication number
- CN217953610U CN217953610U CN202221198073.2U CN202221198073U CN217953610U CN 217953610 U CN217953610 U CN 217953610U CN 202221198073 U CN202221198073 U CN 202221198073U CN 217953610 U CN217953610 U CN 217953610U
- Authority
- CN
- China
- Prior art keywords
- liquid level
- level switch
- preset time
- time period
- base
- 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.)
- Active
Links
Images
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Level Indicators Using A Float (AREA)
Abstract
The utility model relates to a non-contact liquid level switch, which comprises a PCB circuit board and an induction plate electrically connected with the PCB circuit board; the PCB is provided with a liquid level sensing circuit and an MCU; the liquid level sensing circuit is electrically connected with the sensing plate and used for sensing liquid level signals every a first preset time period; the MCU is electrically connected with the liquid level sensing circuit and is configured to: acquiring liquid level height values in a second continuous preset time period; comparing the liquid level height value in the second preset time period with a preset liquid level threshold value, and outputting a low level alarm signal when the liquid level height value in the second preset time period exceeds the preset liquid level threshold value; its hysteresis interval that realizes liquid level detection effectively filters interfering signal, avoids wrong report to police, increases the degree of accuracy of this product.
Description
Technical Field
The utility model belongs to the technical field of the liquid level switch technique and specifically relates to indicate a non-contact liquid level switch.
Background
The existing liquid level switches in the market are mainly magnetic reed tube type and contact type capacitance liquid level switches.
The magnetic reed type liquid level switch has mechanical contacts and short service life.
The contact type capacitance liquid level switch is easy to be polluted by the deposition of impurities such as water scale and the like, which causes inaccurate measurement and easy false alarm,
in addition, the existing non-contact liquid level switch in the market is easily interfered during working, and the detection precision can not be ensured.
Therefore, in the present patent application, the applicant has elaborated a non-contact liquid level switch capable of solving the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses not enough to above-mentioned prior art exists, main aim at provides a non-contact liquid level switch, and it realizes liquid level detection's the time of lagging behind, and effective filtering interfering signal avoids the wrong report alert, increases the degree of accuracy of this product.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a non-contact liquid level switch comprises a PCB circuit board and an induction plate electrically connected with the PCB circuit board;
the PCB is provided with a liquid level sensing circuit and an MCU;
the liquid level sensing circuit is electrically connected with the sensing plate and used for sensing liquid level signals every a first preset time period;
the MCU is electrically connected with the liquid level sensing circuit and is configured to:
acquiring liquid level height values in a second continuous preset time period;
and comparing the liquid level height value in the second preset time period with a preset liquid level threshold value, and outputting a low level alarm signal when the liquid level height value in the second preset time period exceeds the preset liquid level threshold value.
As a preferred scheme, the PCB induction heating device further comprises a shell, wherein the PCB circuit board and the induction plate are both arranged in the shell, and a pressing block for fixing the induction plate is also arranged in the shell; through the briquetting, can carry on spacingly to the tablet, avoid its not hard up change and the unstability of capacitance value that leads to detecting, eliminate the wrong report and police, ensure that the function of product can be normal use under all kinds of environment for a long time.
As a preferred scheme, the PCB, the pressing block and the induction plate are sequentially arranged from top to bottom.
As an optimal scheme, the pressing block is provided with a yielding groove along the upper direction and the lower direction of the pressing block, and the PCB and the induction plate are electrically connected conveniently through the yielding groove.
As a preferred scheme, the casing is including the main casing body and fixed connection in the base of the main casing body, the base has the first holding tank of upper end open-ended, briquetting and tablet are all installed in first holding tank.
As a preferred scheme, the pressing block is connected with the inner side wall of the first accommodating groove in a buckling mode.
As a preferred scheme, a first sealing element is arranged between the main shell and the base, and the first sealing element can improve the sealing property between the main shell and the base and ensure the sealing property of the product in various environments for a long time.
As a preferred scheme, a first annular groove is concavely arranged at the upper end of the base, and the first sealing element is arranged in the first annular groove;
the protruding annular chimb that is equipped with of lower extreme of the main casing body, the main casing body is connected with the base, just in the annular chimb stretched into first annular groove annular chimb butt is on first sealing member.
As a preferable scheme, a second annular groove is concavely arranged at the lower end of the base, and a second sealing element is arranged in the second annular groove.
As a preferable scheme, the left side and the right side of the main shell are respectively symmetrically provided with mounting lugs, and through holes are formed in the mounting lugs in the up-down direction of the mounting lugs.
Compared with the prior art, the utility model obvious advantage and beneficial effect have, particularly: the liquid level detection method mainly comprises the steps that a liquid level sensing circuit senses liquid level signals every other first preset time period, an MCU acquires liquid level height values in continuous second preset time periods, the liquid level height values in the second preset time periods are compared with preset liquid level threshold values, and low-level alarm signals are output when the liquid level height values in the second preset time periods exceed the preset liquid level threshold values, so that a hysteresis interval of liquid level detection is realized, interference signals are effectively filtered, false alarms are avoided, and the accuracy of the product is improved;
secondly, the setting of the pressing block can limit and fix the induction plate, so that the change and instability of the detected capacitance value caused by the looseness of the induction plate are avoided, false alarms are effectively eliminated, and the function of the product can be normally used in various environments for a long time;
moreover, the sealing performance between the main shell and the base is ensured by the matching of the first sealing member and the annular convex edge;
and the whole structure is ingenious in design, all parts are convenient and stable to assemble, and the stability and reliability of the product in the using process are ensured.
To more clearly illustrate the structural features and effects of the present invention, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is an exploded view of an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional structure diagram of an embodiment of the present invention.
Fig. 3 is a schematic control diagram of an embodiment of the present invention.
The reference numbers illustrate:
11. main housing 111, screw
112. Mounting ears 113, through-holes
114. Insert 115, annular bead
12. Base seat
121. First annular groove 122 and first accommodating groove
123. Second annular groove 124, second seal
13. First seal member
21. PCB circuit board
211. Liquid level sensing circuit 212 and MCU
22. Induction plate
23. A pressing block 231 and an abdicating groove.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 1 to 3, a non-contact liquid level switch includes a PCB 21, a housing, and a sensing board 22 electrically connected to the PCB 21;
the PCB 21 and the induction plate 22 are arranged in the shell, and the PCB 21, the pressing block 23 and the induction plate 22 are sequentially arranged from top to bottom. The PCB circuit board 21 is provided with a liquid level sensing circuit 211 and an MCU 212;
the liquid level sensing circuit 211 is electrically connected to the sensing plate 22 and configured to sense a liquid level signal every first preset time period;
the MCU 212 is electrically connected to the liquid level sensing circuit 211 and is configured to: acquiring liquid level height values in a second continuous preset time period; and comparing the liquid level height value in the second preset time period with a preset liquid level threshold value, and outputting a low level alarm signal when the liquid level height value in the second preset time period exceeds the preset liquid level threshold value.
In this embodiment, when the liquid level is higher than the preset liquid level threshold, the MCU 212 outputs a low level alarm signal to the subsequent circuits; when the liquid level is lower than the preset liquid level threshold, the MCU 212 outputs a high level signal to the subsequent circuits.
Assuming that the first preset time period is 0.3 seconds, and the second preset time period is 3 seconds;
further, sensing board 22 detects capacitance every 0.3 seconds, and MCU22 converts the measured capacitance to a liquid level height value. If all liquid level height values obtained by the MCU 212 within 3 continuous seconds exceed the preset liquid level threshold value by more than 2mm, the detected liquid level value is considered to be an effective value, and the MCU 212 outputs a low level alarm signal, namely the liquid level is higher than the preset liquid level threshold value;
if all liquid level height values acquired by the MCU 212 within 3 continuous seconds are less than 2mm below a preset liquid level threshold value, the detected liquid level value is considered to be an effective value, and a high level is output, namely the liquid level is lower than the preset liquid level threshold value; otherwise, the output state is regarded as a disturbance value and remains unchanged.
Still install the briquetting 23 that is used for fixed tablet 22 in the casing, briquetting 23 is followed its upper and lower downwardly extending and is equipped with the groove of stepping down 231, briquetting 23 and the inside wall of following first holding tank 122 are connected through the buckle mode.
In this embodiment, the housing includes a main housing 11 and a base 12 fixedly connected to the main housing 11, and preferably, the main housing 11 is fixedly connected to the base 12 through a screw 111.
The left side and the right side of the main casing 11 are respectively provided with a mounting ear 112 symmetrically, the mounting ear 112 is provided with a through hole 113 along the upper and the lower direction, and an insert 114 for fixing the main casing 11 is arranged in the through hole 113.
A first seal 13 is provided between the main housing 11 and the base 12. In this embodiment, an annular flange 115 is convexly disposed at the lower end of the main housing 11, the main housing 11 is connected to the base 12, the annular flange 115 extends into the first annular groove 121, and the annular flange 115 abuts against the first sealing member 13; a first annular groove 121 is concavely arranged at the upper end of the base 12, and the first sealing element 13 is arranged in the first annular groove 121;
the base 12 has a first receiving groove 122 with an open upper end, and the pressing block 23 and the induction plate 22 are both installed in the first receiving groove 122. The lower end of the base 12 is concavely provided with a second annular groove 123, and a second sealing member 124 is arranged in the second annular groove 123.
The utility model relates to a key point lies in, it mainly is through liquid level sensing circuit every first preset time quantum response liquid level signal, MCU acquires the liquid level height value in the continuous second preset time quantum, compare the liquid level height value in the second preset time quantum with preset liquid level threshold value, and output low level alarm signal when the liquid level height value in the second preset time quantum all surpasss preset liquid level threshold value, realize the hysteresis zone of liquid level detection, effective filtering interfering signal avoids wrong report police, increase the degree of accuracy of this product;
secondly, the setting of the pressing block can limit and fix the induction plate, so that the change and instability of the detected capacitance value caused by the looseness of the induction plate are avoided, false alarms are effectively eliminated, and the function of the product can be normally used in various environments for a long time;
moreover, the sealing performance between the main shell and the base is ensured by the matching of the first sealing member and the annular convex edge;
and the whole structure is ingenious in design, all parts are convenient and stable to assemble, and the stability and reliability of the product in the using process are ensured.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.
Claims (10)
1. A non-contact level switch, characterized in that: comprises a PCB circuit board and an induction board electrically connected with the PCB circuit board;
the PCB is provided with a liquid level sensing circuit and an MCU;
the liquid level sensing circuit is electrically connected with the sensing plate and used for sensing liquid level signals every a first preset time period;
the MCU is electrically connected with the liquid level sensing circuit and is configured to:
acquiring liquid level height values in a second continuous preset time period;
and comparing the liquid level height value in the second preset time period with a preset liquid level threshold value, and outputting a low level alarm signal when the liquid level height value in the second preset time period exceeds the preset liquid level threshold value.
2. The non-contact liquid level switch of claim 1, wherein: still including the casing, PCB circuit board and tablet are all installed in the casing, still install the briquetting that is used for fixed tablet in the casing.
3. The non-contact liquid level switch of claim 2, wherein: the PCB, the pressing block and the induction plate are sequentially arranged from top to bottom.
4. The non-contact liquid level switch of claim 2, wherein: the briquetting has the groove of stepping down along its upper and lower to running through.
5. The non-contact liquid level switch of claim 2, wherein: the casing is including the main casing body and fixed connection in the base of the main casing body, the base has upper end open-ended first holding tank, briquetting and tablet are all installed in first holding tank.
6. The non-contact liquid level switch of claim 5, wherein: the briquetting passes through the buckle mode with the inside wall of first holding tank and connects.
7. The non-contact liquid level switch of claim 5, wherein: a first seal is disposed between the main housing and the base.
8. The non-contact liquid level switch of claim 7, wherein: the upper end of the base is concavely provided with a first annular groove, and the first sealing element is arranged in the first annular groove;
the protruding annular chimb that is equipped with of lower extreme of the main casing body, the main casing body is connected with the base, just in the annular chimb stretched into first annular groove annular chimb butt is on first sealing member.
9. The non-contact liquid level switch of claim 7, wherein: the lower end of the base is concavely provided with a second annular groove, and a second sealing element is arranged in the second annular groove.
10. The non-contact liquid level switch of claim 7, wherein: the left side and the right side of the main shell are symmetrically provided with mounting lug parts respectively, and the mounting lug parts are provided with through holes along the upper direction and the lower direction of the mounting lug parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221198073.2U CN217953610U (en) | 2022-05-19 | 2022-05-19 | Non-contact liquid level switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221198073.2U CN217953610U (en) | 2022-05-19 | 2022-05-19 | Non-contact liquid level switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217953610U true CN217953610U (en) | 2022-12-02 |
Family
ID=84214526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221198073.2U Active CN217953610U (en) | 2022-05-19 | 2022-05-19 | Non-contact liquid level switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217953610U (en) |
-
2022
- 2022-05-19 CN CN202221198073.2U patent/CN217953610U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0377508A1 (en) | Capacitive liquid level sensor | |
| CN217953610U (en) | Non-contact liquid level switch | |
| CN111121720A (en) | Transformer inclination detection device and detection method | |
| CN113440073B (en) | Method for measuring liquid level in water tank | |
| CN215777247U (en) | Electric steam box capable of automatically controlling water quantity | |
| CN218186666U (en) | Floor cleaning machine | |
| CN212255438U (en) | Multi-functional smart electric meter structure of easy dismouting | |
| CN220494948U (en) | Cleaning device | |
| CN216116251U (en) | Water tank with liquid level detection function | |
| CN218271194U (en) | Pressure sensor with pressure alarm structure | |
| CN218684013U (en) | Soap lye detection module and give soap machine | |
| CN213940539U (en) | Food processing machine | |
| CN221197509U (en) | Range hood and oil receiving amount detection device thereof | |
| CN215494169U (en) | Metal detection pen | |
| CN214409992U (en) | Intrusion detection device for server case | |
| CN215491959U (en) | Liquid level detection device of foot tub | |
| CN218768396U (en) | Kitchen gas alarm with waterproof construction and prevent wrong report system | |
| CN215767272U (en) | Liquid level measurement device in water tank and sweeping robot | |
| CN215559088U (en) | Water purifying device | |
| CN214502591U (en) | Water suction type cleaning appliance capable of detecting water level | |
| CN220018655U (en) | Flooding sensor convenient to install | |
| CN215309197U (en) | Injection device | |
| CN210691563U (en) | Wireless water inductor | |
| CN213423045U (en) | Wearing equipment | |
| CN220231970U (en) | Distance measuring mechanism and toilet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Room 101, No. 1, East Ring 3rd Street, Jitiagang, Huangjiang Town, Dongguan City, Guangdong Province, 523000 Patentee after: Guangdong Zhengyang Sensor Technology Co.,Ltd. Address before: No.1, Donghuan 3rd Street, jitigang village, Huangjiang Town, Dongguan City, Guangdong Province 523000 Patentee before: DONGGUAN ZHENGYANG ELECTRONIC MECHANICAL Co.,Ltd. |
|
| CP03 | Change of name, title or address |