Liquid level detection device

Abstract

The embodiment of the utility model provides a liquid level detection device which comprises a liquid level detection circuit which comprises a liquid level probe, a common terminal and a liquid level signal detection module. The voltage source is connected with the liquid level probe, and the voltage source comprises a positive voltage source or a negative voltage source with opposite voltage polarities; wherein the voltage source provides initial positive voltage or negative voltage for the liquid level probe, so that the liquid level probe and the common terminal form a current path, and the voltage source is switched to the voltage polarity of the voltage provided by the liquid level probe. According to the invention, the scaling or rusting phenomenon of the liquid level probe and the common terminal can be effectively relieved or solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water purification technical field especially relates to a liquid level detection device. BACKGROUND

[0002] The current common hot tank liquid level detection technology uses multiple length metal probes as anode (positive voltage), and the common terminal in the hot tank as cathode or ground, to form a signal current path, thereby converting the liquid level height in the hot tank into an electrical signal, realizing the liquid level height detection function in the metal hot tank.

[0003] But the metal probe and the common terminal in the prior art will produce an electrochemical reaction with the ions (calcium, magnesium, chlorine, sulfate, etc.) in the water after being electrified, as the continuous directional movement of the ions in the water will cause rusting or fouling phenomenon, thereby causing the product function to decline and shortening the service life of the hot tank. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a liquid level detection device for a water storage and heating device, to solve the problem of fouling or rusting of the metal probe and the common terminal of the hot tank caused by the continuous directional movement of the ions in the water during liquid level detection.

[0005] According to the embodiment of the utility model, a liquid level detection device is provided, which comprises: a liquid level detection circuit, the liquid level detection circuit comprising: a liquid level probe, a common terminal and a liquid level signal detection module; a voltage source, the voltage source being connected with the liquid level probe, the voltage source comprising a positive voltage source or a negative voltage source with opposite voltage polarity; wherein the voltage source provides an initial positive voltage or negative voltage for the liquid level probe, so that the liquid level probe and the common terminal form a current path, and the voltage source switches the voltage polarity of the voltage provided by the liquid level probe.

[0006] Among them, the liquid level probe is arranged in the water storage and heating device, and the common terminal is a common probe or a tank body of the water storage and heating device.

[0007] Among them, the voltage source provides an initial positive voltage for the liquid level probe, and the water storage and heating device is in a liquid level detection mode; the voltage source switches to provide a negative voltage for the liquid level probe, and the water storage and heating device is in a rust and scale removal mode.

[0008] Among them, the voltage source provides an initial negative voltage for the liquid level probe, and the water storage and heating device is in a rust and scale removal mode; the voltage source switches to provide a positive voltage for the liquid level probe, and the water storage and heating device is in a liquid level detection mode.

[0009] The liquid level detection circuit further comprises a signal isolation module, when the voltage source switches the voltage polarity of the voltage provided by the liquid level probe, the signal isolation module blocks the electrical connection between the liquid level probe and the liquid level signal detection module.

[0010] The liquid level detection circuit further comprises a voltage dividing resistor arranged between the liquid level probe and the voltage source.

[0011] The liquid level probe comprises a plurality of probes with different lengths.

[0012] The common terminal is a common probe or a metal tank of the water storage heating device.

[0013] The common terminal is 0 voltage.

[0014] The voltage source further comprises a positive voltage switch connected with the positive voltage source and a negative voltage switch connected with the negative voltage source.

[0015] According to the technical scheme of the present application, by changing or switching the voltage polarity provided for the liquid level probe, the water storage heating device is switched between the liquid level detection mode and the rust removal / corrosion removal mode, without changing the structure of the liquid level detection circuit, the scaling or rusting phenomenon caused by the one-way movement of ions between the liquid level probe and the common terminal can be effectively alleviated or solved, the heating efficiency of the device can be effectively improved, and the service life of the product is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate certain non-limiting embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0017] Figure 1 is a structural block diagram of a liquid level detection system according to an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of a liquid level detection system according to an embodiment of the present application;

[0019] Figure 3 is a cross-sectional schematic diagram of a hot tank device according to an embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model technical scheme will be described clearly and completely in combination with specific embodiments of the utility model and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model.

[0021] The technical scheme provided by each embodiment of the utility model will be described in detail in combination with the drawings.

[0022] In the process that the liquid level detection probe detects the liquid level of the heat tank, the metal probe and the common terminal form a signal current path, and under the condition of continuous energization, the ions in the water will move directionally (for example, the negatively charged chloride and sulfate ions move to the positive electrode, and the positively charged calcium and magnesium ions move to the negative electrode), which will cause the probe and the heat tank to scale and / or rust.

[0023] According to the utility model embodiment, a liquid level detection system is provided, by changing the relative relationship between the anode and the cathode during liquid level detection, the ions (calcium, magnesium, chlorine, sulfate, etc.) participating in the reaction are moved reversely, the spatial scene and the time scene of the electrochemical reaction are destroyed, and the rusting and / or scaling of the liquid level probe and the common terminal is effectively slowed down, improved or solved without changing the structure of the liquid level detection circuit. The liquid level detection system can be applied to a water storage and heating device, which can be a heat tank product using heat tank heating body heat storage technology or a water purification product with a heat tank, and is used for heating pure water.

[0024] Reference Figure 1 And Figure 2 The liquid level detection system mainly includes a liquid level detection circuit 10 and a voltage source 20. The liquid level detection circuit 10 is used for detecting the water level height of the water storage and heating device, and further includes a liquid level probe 11, a common terminal 12, a liquid level signal detection module 13, a signal isolation module 14 and a voltage dividing resistor 15. Generally, the liquid level probe 11 can be a resistance type liquid level sensor arranged in the water storage and heating device. The liquid level probe 11 can be fixedly extended downward from the top of the heat tank, or fixedly extended upward from the bottom of the heat tank. The common terminal 12 can be a common probe or the heat tank itself, such as the bottom of the heat tank or the side wall of the heat tank. In the process that the liquid level detection probe detects the liquid level of the heat tank, the metal probe and the common terminal form a signal current path, and under the condition of continuous energization, the ions in the water will move directionally (for example, the negatively charged chloride and sulfate ions move to the positive electrode, and the positively charged calcium and magnesium ions move to the negative electrode), which will cause the probe and the heat tank to scale and / or rust. Figure 3In the shown embodiment, four liquid level probes 11 of different lengths extend downward from the top of the hot tank, and the hot tank body serves as a common terminal 12. When the liquid level probes 11 and the common terminal 12 form a current path at different water levels, a liquid level signal detection module 13 can detect an electrical signal and convert it into corresponding liquid level height data. The signal isolation module 14 is used to block the electrical connection between the liquid level probes 11 and the liquid level signal detection module 13 when the voltage source 20 switches the voltage polarity of the voltage provided by the liquid level probes 11, so as to protect the liquid level signal detection module 13. The voltage dividing resistor 15 is connected in series between the voltage source 20 and the signal isolation module 14 to provide a suitable voltage required by the liquid level signal detection module 13. It should be noted that in the embodiments of the present application, the liquid level detection system can be integrated with the water storage and heating device or can be separately arranged (except for the liquid level probes and the common terminal), which will not be described again.

[0025] The voltage source 20 includes a positive voltage source 21 and a negative voltage source 22 with opposite voltage polarities, and further includes a positive voltage switch 23 connected to the positive voltage source 21 and a negative voltage switch 24 connected to the negative voltage source 22. The positive voltage source 21 (+VDC) provides a positive voltage to the liquid level probes 11, and the negative voltage source 22 (-VDC) provides a negative voltage to the liquid level probes 11. The positive voltage switch 23 (PSW) is used to switch the connection between the positive voltage source 21 and the liquid level probes 11, and the negative voltage switch 24 (NSW) is used to switch the connection between the negative voltage source 22 and the liquid level probes 11.

[0026] It should be noted that in the embodiments of the present application, the liquid level detection system can be integrated with the water storage and heating device or can be separately arranged (except for the liquid level probes and the common terminal), which will not be described again.

[0027] According to the embodiments of the present application, the voltage source 20 provides an initial positive voltage or negative voltage to the liquid level probes 11, so that the liquid level probes 11 and the common terminal 12 form a current path, and then the voltage source 20 switches or changes the voltage polarity of the voltage provided by the liquid level probes 11, so that the water storage and heating device switches between the liquid level detection mode and the rust removal / cleaning mode. The liquid level detection mode refers to the working mode in which the hot tank can detect the height of cold water or hot water in the hot tank 30, and the rust removal / cleaning mode refers to the working mode in which the hot tank can remove, alleviate or improve the scaling and / or rusting of the probes and the hot tank.

[0028] Specifically, the voltage source 20 provides an initial positive voltage for the liquid level probe 11, so that the water storage heating device is in the liquid level detection mode; then, the voltage source 20 switches to provide a negative voltage for the liquid level probe 11, so that the water storage heating device is in the rust removal / cleaning mode. Alternatively, the voltage source 20 provides an initial negative voltage for the liquid level probe 11, so that the water storage heating device is in the rust removal / cleaning mode; then, the voltage source 20 switches to provide a positive voltage for the liquid level probe 11, so that the water storage heating device is in the liquid level detection mode.

[0029] That is, the hot tank first performs one of the liquid level detection mode or the rust removal / cleaning mode, and then changes the voltage polarity of the liquid level probe to exchange the relative relationship between the positive and negative poles, change the initial working mode of the hot tank, and realize the switching between the liquid level detection mode and the rust removal / cleaning mode. Details are described below.

[0030] In the embodiment of the present application, first, the positive voltage switch 23 of the voltage source 20 is closed and the negative voltage switch 24 is disconnected, at this time, the positive voltage source 21 is in communication with the liquid level probe 11, the liquid level probe 11 is initially connected to the positive voltage, the common terminal is connected to the ground with 0 voltage, and the signal isolation module 14 conducts the liquid level signal detection module 13 to perform liquid level signal detection. This mode of liquid level probe 11 connected to the positive voltage for liquid level signal detection can be called positive voltage liquid level detection mode. Assuming that the circuit system (MCU) of the liquid level signal detection module 13 is a positive voltage system, it can be directly connected to the positive voltage system MCU. After the above (positive voltage) liquid level detection mode lasts for a period of time, the positive voltage switch 23 of the voltage source 20 is disconnected and the negative voltage switch 24 is closed, at this time, the negative voltage source 22 is in communication with the liquid level probe 11, and the liquid level probe 11 is switched to be connected to the negative voltage, the common terminal is connected to the ground with 0 voltage, and the signal isolation module 14 blocks the negative voltage signal to protect the liquid level signal detection module 13, at this time, the cleaning of the probe and the hot tank is performed. This cleaning mode can be called negative voltage rust removal / cleaning mode. After the negative voltage rust removal / cleaning mode lasts for a period of time, the negative voltage switch 24 of the voltage source 20 is disconnected, and the liquid level probe 11 and the common terminal 12 are disconnected to make them have no electrode polarity, so as to destroy the space scene and time scene of the electrochemical reaction.

[0031] In the positive voltage liquid level detection mode, the positive and negative terminals will have corresponding chemical reactions with the ions in the water, and the rusting (caused by chloride and sulfate ions) or scaling (caused by calcium and magnesium ions) phenomenon occurs on the liquid level probe 11 and the common terminal 12. In the rust removal / cleaning mode, the ions (calcium, magnesium, chlorine, sulfate, etc.) participating in the reaction move reversely and return to the water from the positive and negative terminals, which can effectively alleviate, improve or eliminate the scaling or rusting phenomenon of the probe and the hot tank.

[0032] In the embodiment of the present application, the liquid level probe 11 can be connected to a positive voltage for liquid level detection, and the liquid level probe 11 can be connected to a negative voltage for cleaning, which is referred to as a positive voltage liquid level detection-negative voltage rust removal / scaling removal mode. It should be noted that the above process is to perform the positive voltage liquid level detection mode first and then perform the negative voltage rust removal / scaling removal mode, but the negative voltage rust removal / scaling removal mode can also be performed first and then the positive voltage liquid level detection mode. The present application does not limit the execution sequence and time of the two modes. For the execution time, the execution time of the negative voltage rust removal / scaling removal mode can be determined according to the execution time of the positive voltage liquid level detection mode, for example, the execution time of the negative voltage rust removal / scaling removal mode is determined according to the execution time of the positive voltage liquid level detection mode, the size of the positive voltage and the size of the negative voltage.

[0033] In addition to the above-mentioned positive voltage liquid level detection-negative voltage rust removal / scaling removal mode, the liquid level probe 11 can also be connected to a negative voltage for liquid level detection, and the liquid level probe 11 can be connected to a positive voltage for rust removal / scaling removal, which is referred to as a negative voltage liquid level detection-positive voltage rust removal / scaling removal mode. That is, the present application does not limit whether the liquid level probe is connected to a positive voltage or a negative voltage when performing liquid level detection.

[0034] Specifically, in the negative voltage liquid level detection-positive voltage rust removal / scaling removal mode, first, the negative voltage switch 24 of the voltage source 20 is closed and the positive voltage switch 23 is disconnected, at this time, the negative voltage source 22 is in communication with the liquid level probe 11, the liquid level probe 11 is initially connected to a negative voltage, the common terminal is connected to ground and is 0 voltage, and the signal isolation module 14 conducts the liquid level signal detection module 13 to perform liquid level signal detection. Among them, assuming that the circuit system (MCU) of the liquid level signal detection module 13 is a positive voltage system, a circuit for converting negative voltage data to positive voltage data needs to be added to be connected to the positive voltage system MCU. After the above-mentioned negative voltage liquid level detection mode lasts for a period of time, the negative voltage switch 24 of the voltage source 20 is disconnected and the positive voltage switch 23 is closed, at this time, the positive voltage source 21 is in communication with the liquid level probe 11, the liquid level probe 11 is switched to a positive voltage, the common terminal is connected to ground and is 0 voltage, and the signal isolation module 14 blocks the positive voltage signal to protect the liquid level signal detection module 13, at this time, the probe and the hot tank are cleaned. After the positive voltage rust removal / scaling removal mode lasts for a period of time, the positive voltage switch 23 of the voltage source 20 is disconnected, the liquid level probe 11 and the common terminal 12 are powered off to make them have no electrode polarity, and the space scene and time scene of the electrochemical reaction are destroyed.

[0035] In the negative voltage liquid level detection mode, the positive and negative terminals will have corresponding chemical reactions with the ions in the water, and the liquid level probe 11 and the common terminal 12 will have rusting (caused by chloride ions and sulfate ions) or scaling (caused by calcium ions and magnesium ions). In the positive voltage rust removal / scaling removal mode, the ions (calcium, magnesium, chlorine, sulfate, etc.) participating in the reaction move in the opposite direction, separate from the positive and negative terminals and return to the water, which can effectively alleviate, improve or remove the scaling or rusting of the probe and the hot tank.

[0036] It should be noted that in the above-mentioned negative pressure liquid level detection-positive pressure rust / corrosion removal mode, the positive pressure rust / corrosion removal mode is executed first after the negative pressure liquid level detection mode is executed, but the negative pressure liquid level detection mode can also be executed first after the positive pressure rust / corrosion removal mode is executed. The application does not limit the execution order and time of the two modes. For the execution time, the execution time of the positive pressure rust / corrosion removal mode can be determined according to the execution time of the negative pressure liquid level detection mode, for example, the execution time of the positive pressure rust / corrosion removal mode is determined according to the execution time of the negative pressure liquid level detection mode, the size of the positive voltage and the size of the negative voltage.

[0037] In summary, according to the embodiments of the application, by changing or switching the voltage polarity of the liquid level probe, the relative relationship between the cathode and anode of the liquid level probe and the common terminal is switched, so that the liquid level probe and the common terminal are separated from a single and continuous electrochemical reaction. After the polarity of the liquid level probe and the common terminal is switched, the ions in the water can be promoted to move in the opposite direction, thereby improving and solving the phenomenon of rusting or scaling of the liquid level probe and the common terminal in the water storage and heating device, realizing the effect of product self-cleaning, avoiding the problem of inaccurate liquid level measurement due to rusting or scaling, and effectively prolonging the service life of the product.

[0038] Although the present disclosure has been described in detail with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the embodiments. Therefore, the present disclosure is intended to cover modifications and variations of the present disclosure, any modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present disclosure, should be included in the scope of the claims of the present disclosure and equivalents thereof.

[0039] In addition, the features disclosed in the above description or claims or drawings, in their specific form or according to the way for performing the disclosed functions or the method or process for obtaining the disclosed results, can be used alone or in any combination of these features to implement the present disclosure in their different forms. Specifically, one or more features of any one embodiment described herein can be combined with one or more features of any other embodiment described herein.

[0040] Any feature disclosed in any one or more of the disclosure documents cited and / or incorporated by reference in the present disclosure can also be claimed.

Claims

1. A liquid level detecting device characterized by comprising: The liquid level detection device comprises: a liquid level detection circuit comprising a liquid level probe, a common terminal and a liquid level signal detection module; a voltage source connected to the liquid level probe, the voltage source comprising a positive voltage source and a negative voltage source with opposite voltage polarities; wherein the voltage source provides an initial positive voltage or negative voltage to the liquid level probe, so that the liquid level probe and the common terminal form a current path, and the voltage source switches the voltage polarity of the voltage provided to the liquid level probe.

2. The liquid level detecting device according to claim 1, characterized by The liquid level probe is arranged in a water storage and heating device, and the common terminal is a common probe or a tank body of the water storage and heating device.

3. The liquid level detection device according to claim 2, wherein: the voltage source provides an initial positive voltage to the liquid level probe, and the water storage and heating device is in a liquid level detection mode; the voltage source switches the voltage polarity of the voltage provided to the liquid level probe, and the water storage and heating device is in a rust and scale removal mode.

4. The liquid level detection device according to claim 2, wherein: the voltage source provides an initial negative voltage to the liquid level probe, and the water storage and heating device is in a rust and scale removal mode; the voltage source switches the voltage polarity of the voltage provided to the liquid level probe, and the water storage and heating device is in a liquid level detection mode.

5. The liquid level detecting device according to claim 1, characterized by The liquid level detection circuit further comprises a signal isolation module, which blocks the electrical connection between the liquid level probe and the liquid level signal detection module when the voltage source switches the voltage polarity of the voltage provided to the liquid level probe.

6. The liquid level detection device according to claim 5, characterized in that The liquid level detection circuit further comprises a voltage dividing resistor arranged between the liquid level probe and the voltage source.

7. The liquid level detection device according to claim 2, characterized by The liquid level probe comprises a plurality of probes with different lengths.

8. The liquid level detection apparatus according to claim 2, characterized by The common terminal is a common probe or a metal tank body of the water storage and heating device.

9. The liquid level detection device according to claim 8, characterized in that The common terminal is a 0-voltage terminal.

10. The liquid level detection apparatus according to claim 1, characterized by The voltage source further comprises a positive voltage switch connected to the positive voltage source and a negative voltage switch connected to the negative voltage source.

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