Multi-section photoelectric liquid level sensor capable of resisting water mist interference
Through the multi-stage photoelectric level sensor, it uses infrared emitting tubes, receiving tubes and voltage comparators to integrate chips, combined with prism refracted light signals, the problem of misjudgment of water levels in high-temperature water environments is solved, and accurate water level detection and safety protection are achieved.
Patent Information
- Application Number
- CN202421997672.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-08-19
AI Technical Summary
The temperature sensors and capacitive liquid level sensors in the prior art are easily disturbed by water mist in high-temperature water environments, resulting in misjudgment of water levels and posing safety hazards.
A multi-stage photoelectric level sensor is used, and an integrated chip is integrated with an infrared transmitter, an infrared receiving tube and a voltage comparator, and a light signal is refracted through a prism, combined with a voltage comparator integrated chip and a microcontroller to determine the water level to prevent misjudgment.
It realizes accurate detection of water levels in high-temperature water environments, avoids misjudgment, ensures safe use, and prevents dry boiling without water and high-temperature water vapor from scalding.
Smart Images
Figure CN223166206U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid level sensors, and particularly relates to a multi-section photoelectric liquid level sensor resistant to water mist interference. Background Art
[0002] At present, for containers used to hold hot water, such as high-temperature water tanks, kettles, high-temperature storage water tanks, water heaters, etc., most use temperature sensors or capacitive liquid level sensors to detect their water levels. However, in the same container environment, the water temperature is almost the same as the temperature of the water vapor inside, which is prone to misjudgment; when the capacitive liquid level sensor detects the water level, it is easily affected by the water mist generated by hot water adhering to the container wall, resulting in misjudgment. Therefore, it is necessary to design a multi-section photoelectric liquid level sensor resistant to water mist interference to solve the above problems, so that it can meet the needs of users during use, without the need for manual inspection of whether there is water or lack of water in the container, which may cause burns by high-temperature water vapor, nor the need to worry about the hidden danger of dry burning without water. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a multi-section photoelectric liquid level sensor resistant to water mist interference to solve the problems raised in the above background art.
[0004] To achieve the above object, a multi-section optoelectronic liquid level sensor resistant to water mist interference provided by the utility model includes a multi-section circuit board arranged on the front side wall of a container. The multi-section circuit board is vertically arranged between the top and the bottom of the container. A triangular prism corresponding to the multi-section circuit board is embedded in the front side wall of the container. The multi-section circuit board is provided with a number of sections distributed at equal intervals according to the height of the hot water that the container can hold, and a signal detection circuit is correspondingly arranged for each section. The signal detection circuit includes an infrared transmitting tube, an infrared receiving tube and a voltage comparator integrated chip. The optical signal emitted by the infrared receiving tube is refracted by the triangular prism and transmitted to the infrared receiving tube arranged side by side with it. The infrared receiving tube converts the received optical signal into a voltage signal and transmits it to the voltage comparator integrated chip. The positive-phase input end of the voltage comparator integrated chip is electrically connected to the infrared receiving tube, and the output end of the voltage comparator integrated chip is electrically connected to an external single-chip microcomputer through an IO interface. When there is no hot water in the container, the optical signals emitted by the infrared receiving tubes of all sections of the multi-section circuit board are refracted by the triangular prism and transmitted to the infrared receiving tubes arranged side by side with them. The voltage collected by the voltage comparator integrated chip through the positive-phase input end is higher than the reference voltage at the anti-phase input end, and the single-chip microcomputer outputs a high level. When hot water enters the container, the optical signals emitted by the infrared receiving tubes of the sections corresponding to the parts of the container submerged by hot water cannot be refracted by the triangular prism and transmitted to the infrared receiving tubes arranged side by side with them. The collected voltage is lower than the reference voltage, so the single-chip microcomputer outputs a low level. However, the optical signals emitted by the infrared receiving tubes of the sections corresponding to the parts of the container not submerged by hot water are refracted by the triangular prism and transmitted to the infrared receiving tubes arranged side by side with them. The collected voltage is higher than the reference voltage, and the single-chip microcomputer outputs a high level. The optical signals received by the infrared receiving tubes of the sections corresponding to the parts of the container with water mist adhering to the wall are relatively weak, resulting in the voltage comparator integrated chip outputting a high-level signal.
[0005] As a further improvement of this technical solution, a groove is arranged in the middle of the front side wall of the container. The groove is longitudinally arranged and extends from the top to the bottom of the container. The multi-section circuit board is installed in the groove.
[0006] As a further improvement of this technical solution, the triangular prism is arranged on the surface at the bottom of the groove in the front side wall of the container.
[0007] As a further improvement of this technical solution, a number of LED status indicators are longitudinally arranged on the surface of the front side wall of the container on one side of the groove, and one LED status indicator is correspondingly arranged for each section of the multi-section circuit board. The LED status indicator is electrically connected to the output end of the voltage comparator integrated chip of the same section.
[0008] As a further improvement of this technical solution, the container is a water tank, a sink or a kettle for holding hot water.
[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model refracts the optical signal of the infrared emitting tube to the adjacent infrared receiving tube through a triangular prism. The voltage comparator integrated chip compares the voltage signal converted from the optical signal collected by the infrared receiving tube with the reference voltage signal, and takes the comparison result as a level signal to be transmitted to the single-chip microcomputer. When there is no hot water in the container, the optical signals emitted by the infrared receiving tubes at all segments on the multi-segment circuit board are refracted through the triangular prism and transmitted to the adjacent infrared receiving tubes. The collected voltage is higher than the reference voltage, and the single-chip microcomputer outputs a high level. When hot water enters the container, the optical signals emitted by the infrared receiving tubes at the segments corresponding to the parts of the container immersed in hot water cannot be refracted through the triangular prism and transmitted to the adjacent infrared receiving tubes. The collected voltage is lower than the reference voltage, so the single-chip microcomputer outputs a low level. And the optical signals emitted by the infrared receiving tubes at the segments corresponding to the parts of the container not immersed in hot water are refracted through the triangular prism and transmitted to the adjacent infrared receiving tubes. The collected voltage is higher than the reference voltage, and the single-chip microcomputer outputs a high level. The optical signals received by the infrared receiving tubes at the segments corresponding to the parts of the container with water mist adhering to the wall are relatively weak, resulting in the voltage comparator integrated chip outputting a high level signal. Thus, it is possible to use the photoelectric sensor to compare the voltage magnitudes corresponding to different optical signals collected from the air, water mist and water level states in the container with the reference voltage of the voltage comparator integrated chip, and output high level or low level signals. This signal is transmitted to the single-chip microcomputer for sorting. For the water level height corresponding to the last segment that conforms to the linear logic relationship, it is determined as the current water level height signal. Furthermore, while realizing the multi-segment liquid level detection function, the function of preventing misjudgment of water mist is achieved. In this way, it is avoided that people need to check whether there is water or lack of water in the container, which may cause being scalded by high-temperature water vapor, and there is no need to worry about the hidden danger of dry burning without water. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0011] Figure 1 It is a three-dimensional view of the multi-segment photoelectric liquid level sensor of the present utility model installed on a container.
[0012] Figure 2 It is an exploded view of the multi-segment photoelectric liquid level sensor of the present utility model installed on a container.
[0013] Figure 3 It is a light ray diagram between the infrared emitting tube and the infrared receiving tube in the state of no water, air or water mist in the container of the present utility model.
[0014] Figure 4 This is the light diagram between the infrared emitting tube and the infrared receiving tube when the container of the present utility model has water.
[0015] Figure 5 This is the overall system block diagram of the multi - segment photoelectric liquid level sensor of the present utility model.
[0016] Figure 6 This is the circuit schematic diagram of the multi - segment photoelectric liquid level sensor of the present utility model.
[0017] Figure 7 This is the state diagram of the water tank of the present utility model filled with a certain amount of hot water.
[0018] The reference numerals are: container 1, hot water state 101, water mist state 102, air state 103, multi - segment circuit board 2, prism 3, infrared emitting tube 4, infrared receiving tube 5, voltage comparator integrated chip 6, non - inverting input terminal 601, inverting input terminal 602, output terminal 603, single - chip microcomputer 7, groove 8, LED status indicator 9. Detailed implementation manners
[0019] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the embodiments of the present utility model, and should not be construed as a limitation of the present utility model.
[0020] In the description of the embodiments of the present utility model, it should be understood that if there are directional indications involved in the embodiments of the present utility model, such as the upper, lower, left, right, front, back, inner, outer, etc. The directional or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.
[0021] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present utility model, "a plurality" means two or more unless otherwise specifically defined.
[0022] In the embodiments of the present utility model, unless otherwise clearly specified and limited, terms such as "installation", "connection", "linkage", and "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium. It may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.
[0023] Embodiment
[0024] As Figures 1 to 6 As shown in the figure, the embodiments of the present utility model provide a multi-segment photoelectric liquid level sensor resistant to water mist interference, including a multi-segment circuit board 2 arranged on the front side wall of the container 1. The multi-segment circuit board 2 is vertically arranged between the top and the bottom of the container 1. A triangular prism 3 corresponding to the multi-segment circuit board 2 is embedded in the front side wall of the container 1. The multi-segment circuit board 2 is provided with several equidistantly distributed segments according to the height of the hot water that can be contained in the container 1, and a signal detection circuit is correspondingly arranged for each segment; the signal detection circuit includes an infrared emitting tube 4, an infrared receiving tube 5, and a voltage comparator integrated chip 6. The optical signal emitted by the infrared receiving tube 4 is refracted by the triangular prism 3 and transmitted to the infrared receiving tube 5 arranged side by side with it. The infrared receiving tube 5 converts the received optical signal into a voltage signal and transmits it to the voltage comparator integrated chip 6. The positive-phase input terminal 601 of the voltage comparator integrated chip 6 is electrically connected to the infrared receiving tube 5, and the output terminal 603 of the voltage comparator integrated chip 6 is electrically connected to an external single-chip microcomputer 7 through an IO interface; when there is no hot water in the container 1, the optical signals emitted by the infrared receiving tubes 5 of all segments of the multi-segment circuit board 2 are refracted by the triangular prism 3 and transmitted to the infrared receiving tubes 5 arranged side by side with them. The voltage collected by the voltage comparator integrated chip 6 through the positive-phase input terminal 601 is higher than the reference voltage of the inverting input terminal 602, and the single-chip microcomputer 7 outputs a high level. When hot water enters the container 1, the optical signals emitted by the infrared receiving tubes 5 of the segments corresponding to the parts of the container 1 submerged in hot water cannot be refracted by the triangular prism 3 and transmitted to the infrared receiving tubes 5 arranged side by side with them. The collected voltage is lower than the reference voltage, so the single-chip microcomputer 7 outputs a low level. For the segments corresponding to the parts of the container 1 not submerged in hot water, the optical signals emitted by the infrared receiving tubes 5 are refracted by the triangular prism 3 and transmitted to the infrared receiving tubes 5 arranged side by side with them. The collected voltage is higher than the reference voltage, and the single-chip microcomputer 7 outputs a high level. For the parts of the container 1 with water mist adhering to the wall, the optical signals received by the infrared receiving tubes 5 of the corresponding segments are relatively weak, resulting in the voltage comparator integrated chip 6 outputting a high-level signal.
[0025] In this embodiment, as Figure 2As shown in the figure, a groove 8 is provided in the middle of the front side wall of the container 1. The groove 8 is longitudinally arranged and extends from the top of the container 1 to the bottom of the container 1. A multi-section circuit board 2 is installed in the groove 8.
[0026] Specifically, the multi-section circuit board 2 is installed in the groove 8, so that the surface of the container 1 can be kept flat and beautiful. At the same time, a protection board can be installed above the groove 8 to protect the multi-section circuit board 2.
[0027] In this embodiment, as Figure 2 shown, the triangular prism 3 is arranged on the bottom surface of the front side wall of the container 1 inside the groove 8.
[0028] Specifically, the triangular prism 3 and the multi-section circuit board 2 are installed at the top and bottom of the groove surface of the groove 8. The triangular prism 3 and the multi-section circuit board 2 are separated by a groove surface, so that the optical signal of the infrared emitting tube 4 can be transmitted to the infrared receiving tube 5 through the triangular prism 3.
[0029] In this embodiment, as Figure 2 shown, ten LED status indicators 9 are longitudinally arranged on the surface of the front side wall of the container 1 on one side of the groove 8, and each section of the multi-section circuit board 2 corresponds to one LED status indicator 9. The LED status indicator 9 is electrically connected to the output terminal 603 of the voltage comparator integrated chip 6 of the same section.
[0030] Specifically, the LED status indicator 9 is used to display that the water level in the container 1 reaches the corresponding section of the multi-section circuit board 2, so as to display the water level in the container 1.
[0031] In this embodiment, the container 1 is a water tank, a sink or a kettle for holding hot water.
[0032] As Figures 3 to 6 shown, the working principle of the above multi-section photoelectric liquid level sensor is as follows:
[0033] (1) When there is no hot water in the container 1, the infrared receiving tube 5 at the lowest section of the container 1 receives the optical signal emitted by the infrared emitting tube 4 refracted back by the triangular prism 3, and converts the optical signal into a voltage U1 signal. The voltage comparator integrated chip 6 located at point B collects this voltage U1 signal. The voltage U1 at point B is higher than the reference voltage at point A. The output signal of the voltage comparator integrated chip 6 at point C is a high level. The signals of the water levels above the current section are all high levels and are sent to the single-chip microcomputer 7 through the IO interface for judgment and processing, and this state is judged as no water in the container 1.
[0034] (2) When the immersed part of the hot water in container 1 reaches a certain level: The light signals emitted by the infrared emitting tubes 4 corresponding to this immersed part cannot be refracted back to the infrared receiving tubes 5. The voltage U1 collected at point B is lower than the reference voltage at point A. Then the signal output at point C is at a low level. The signals of the water levels below the current level are all at low levels and are sent to the single-chip microcomputer 7 through the IO interface for judgment and processing, and this state is converted into the current water level height.
[0035] (3) When all parts of container 1 are immersed in hot water, the light signals emitted by all the infrared emitting tubes 4 cannot be refracted back to the infrared receiving tubes 5. Then the signals of the water levels below the current level are all at low levels and are sent to the single-chip microcomputer 7 through the IO interface for judgment and processing, and this state is converted into that container 1 is full.
[0036] (4) When there is water mist adhering to the triangular prism 3 in container 1, the light signals received by the corresponding infrared receiving tubes 5 are relatively weak, resulting in the voltage U1 collected at point B being lower than the reference voltage at point A. The voltage comparator integrated chip 6 outputs a high-level signal, and this state is converted into that there is water mist adhering to the inner wall of container 1.
[0037] Among them, this multi-segment photoelectric liquid level sensor is applied to a water tank filled with a certain amount of hot water (as Figure 7 shown, there are three states in the water tank: air state 103, water mist state 102, and hot water state 101). The detection results of each segment are shown in the following table.
[0038]
[0039] It can be seen from the above table that the water level height of the water tank is equivalent to the height of the 4th segment of the multi-segment circuit board, and there are three positions on the inner wall of the water tank with water mist, corresponding to the 5th, 7th, and 9th segments of the multi-segment circuit board respectively.
[0040] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A multi-segment optoelectronic liquid level sensor resistant to water mist interference, comprising a multi-segment circuit board (2) arranged on the front side wall of a container (1), characterized in that, The multi - segment circuit board (2) is vertically arranged between the top and bottom of the container (1). A triangular prism (3) corresponding to the multi - segment circuit board (2) is embedded in the front side wall of the container (1). The multi - segment circuit board (2) is provided with a number of equally - spaced segments according to the height of the hot water that the container (1) can hold, and a signal detection circuit is correspondingly arranged for each segment. The signal detection circuit includes an infrared emitting diode (4), an infrared receiving diode (5), and a voltage comparator integrated chip (6). The optical signal emitted by the infrared emitting diode (4) is refracted by the triangular prism (3) and transmitted to the infrared receiving diode (5) arranged side by side with it. The infrared receiving diode (5) converts the received optical signal into a voltage signal and transmits it to the voltage comparator integrated chip (6). The non - inverting input terminal (601) of the voltage comparator integrated chip (6) is electrically connected to the infrared receiving diode (5), and the output terminal (603) of the voltage comparator integrated chip (6) is electrically connected to an external single - chip microcomputer (7) through an IO interface. When there is no hot water in the container (1), the optical signals emitted by the infrared receiving diodes (5) of all segments of the multi - segment circuit board (2) are refracted by the triangular prism (3) and transmitted to the infrared receiving diodes (5) arranged side by side with them. The voltage collected by the voltage comparator integrated chip (6) through the non - inverting input terminal (601) is higher than the reference voltage of the inverting input terminal (602), and the single - chip microcomputer (7) outputs a high level. When hot water enters the container (1), the optical signals emitted by the infrared receiving diodes (5) of the segments corresponding to the parts of the container (1) submerged in hot water cannot be refracted by the triangular prism (3) and transmitted to the infrared receiving diodes (5) arranged side by side with them. The collected voltage is lower than the reference voltage, so the single - chip microcomputer (7) outputs a low level. For the segments corresponding to the parts of the container (1) not submerged in hot water, the optical signals emitted by the infrared receiving diodes (5) are refracted by the triangular prism (3) and transmitted to the infrared receiving diodes (5) arranged side by side with them. The collected voltage is higher than the reference voltage, and the single - chip microcomputer (7) outputs a high level. For the segments corresponding to the parts of the container (1) with water mist adhering to the wall, the received optical signals of the infrared receiving diodes (5) are relatively weak, resulting in the voltage comparator integrated chip (6) outputting a high - level signal.
2. The multi-segment optoelectronic liquid level sensor resistant to water mist interference according to claim 1, characterized in that, A groove (8) is arranged in the middle of the front side wall of the container (1). The groove (8) is arranged longitudinally and extends from the top of the container (1) to the bottom of the container (1). The multi - segment circuit board (2) is installed in the groove (8).
3. The multi-segment optoelectronic liquid level sensor resistant to water mist interference according to claim 2, characterized in that, The triangular prism (3) is arranged on the bottom surface of the front side wall of the container (1) inside the groove (8).
4. The multi-segment photoelectric liquid level sensor resistant to water mist interference according to claim 2, characterized in that, A number of LED status indicators (9) are arranged longitudinally on the surface of the front side wall of the container (1) on one side of the groove (8), and one LED status indicator (9) is correspondingly arranged for each segment of the multi - segment circuit board (2). The LED status indicator (9) is electrically connected to the output terminal of the voltage comparator integrated chip (6) of the same segment.
5. The multi-segment optoelectronic liquid level sensor resistant to water mist interference according to claim 1, characterized in that, The container (1) is a water tank, sink, or kettle for holding hot water.