Water level detection device and system thereof

Abstract

The utility model provides a water level detection device which is provided with a detection module and a control module, the detection module comprises a sensor, and the sensor comprises a plurality of first capacitors; the control module comprises a second capacitor and an MCU controller, the MCU controller comprises a first switch, a second switch, a third switch, a voltage input port, a reference port and a plurality of detection ports, one end of the first switch is connected with the voltage input port, the other end of the first switch is connected with the reference port, one end of the second switch is connected with the reference port, and the other end of the third switch is connected with the detection ports. The other end of the second switch is connected with each detection port, one end of the third switch is connected with each detection port, the reference port is connected with one end of the second capacitor, each detection port is connected with one end of the corresponding first capacitor, and the capacitors are used for carrying out distance detection. The measurement precision of the water level detection device can be improved on the premise that the water quality is not affected.

Description

Technical Field

[0001] The utility model relates to the field of water level detection, in particular to a water level detection device and a system thereof. Background Art

[0002] In the existing technology, most water detection methods generally use photoelectric liquid level sensors, float liquid level sensors, ultrasonic liquid level sensors or reed switch liquid level sensors for process measurement. However, during the measurement process, the photoelectric liquid level sensor is easily affected by sunlight, and the probe condenses water vapor and affects the measurement accuracy; during the measurement process, the float liquid level sensor and the reed switch liquid level sensor need to contact with the liquid and affect the water quality, and scale will be generated for a long time and affect the measurement accuracy; during the measurement process, the ultrasonic liquid level sensor is easily affected by suspended matter and air temperature and the measurement accuracy is affected, and there is a measurement blind spot. Utility Model Content

[0003] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, to provide a water level detection device and a system thereof, and to detect the water level through air by means of capacitance, thereby improving the sensitivity and signal-to-noise ratio of water level detection without affecting the water quality, and improving the measurement accuracy of water level detection.

[0004] To achieve the above objectives, in a first aspect, an embodiment of the utility model provides a water level detection device, comprising:

[0005] A detection module, the detection module includes a sensor, the sensor is used to non-contactly measure the water level change of the water tank, the sensor includes a plurality of first capacitors, the first capacitors are used to sense the change of the relative dielectric constant of the sensor due to the change of the water level;

[0006] A control module, the control module includes a second capacitor and an MCU controller, the MCU controller includes a first switch, a second switch, a third switch, a voltage input port, a reference port and multiple detection ports, one end of the first switch is connected to the voltage input port, the other end of the first switch is connected to the reference port, one end of the second switch is connected to the reference port, the other end of the second switch is respectively connected to each detection port, one end of the third switch is respectively connected to each detection port, the other end of the third switch is grounded, the reference port is connected to one end of the second capacitor, the other end of the second capacitor is grounded, each detection port is respectively connected to one end of the corresponding first capacitor, and the other end of each first capacitor is grounded.

[0007] Furthermore, in some embodiments, the control module further includes a third capacitor, one end of the third capacitor is connected to the voltage input port, the other end of the third capacitor is grounded, and the third capacitor is used for filtering the input power of the voltage input port.

[0008] Further, in some embodiments, the water level detection device also includes a transformer power supply module, which is connected in series between the third capacitor and the voltage input port. The transformer power supply module includes a transformer power supply input port, a voltage regulator and a transformer power supply output port. The transformer power supply input port is connected to the input end of the voltage regulator, and the output end of the voltage regulator is connected to the transformer power supply output port.

[0009] Furthermore, in some embodiments, the transformer power supply module also includes a transformer diode, the positive terminal of the transformer diode is connected to the output terminal of the voltage regulator, and the negative terminal of the transformer diode is connected to the input terminal of the voltage regulator, and the transformer diode is used as a voltage backflow protector of the voltage regulator.

[0010] Furthermore, in some embodiments, the voltage of the transformer power output port is 5V, and the voltage of the transformer power input port is 12V.

[0011] Furthermore, in some embodiments, the sensor also includes a fourth capacitor, which is used to sense the change in relative dielectric constant of the external air to itself, one end of the fourth capacitor is connected to the corresponding detection port, and the other end of the fourth capacitor is grounded.

[0012] Further, in some embodiments, the control module also includes multiple detection resistors, which are connected in series between the detection port and the corresponding first capacitor, or the detection resistors are connected in series between the detection port and the fourth capacitor, and the detection resistors are used as anti-interference components of the first capacitor or the fourth capacitor.

[0013] Furthermore, in some embodiments, the water level detection device further comprises:

[0014] A water level information upper limit module, the water level information upper limit module is connected to the control module, and the water level information upper limit module is used to analyze the capacitance change value of the second capacitor to obtain the water level information of the water tank;

[0015] A warning water level alarm module is connected to the control module and is used to give an alarm according to the capacitance change value of the second capacitor to warn that the water level of the water tank has reached a warning value.

[0016] Furthermore, in some embodiments, the water level detection device further comprises:

[0017] A display driving module, the display driving module is connected to the control module, and the display driving module is used to display the processed data of the control module;

[0018] A touch key module is connected to the control module and is used as an operating component of the control module.

[0019] In a second aspect, the embodiment of the utility model further proposes a water level detection system, comprising:

[0020] A water tank, the water tank comprises an insulating shell and an inner cavity, the insulating shell is wrapped in the inner cavity, and the inner cavity is used to store water;

[0021] As in the water level detection device of the first aspect, the sensor of the detection module is arranged in spaced relation to the insulating shell.

[0022] A water level detection device according to an embodiment of the utility model has at least the following beneficial effects: a detection module and a control module are provided, the detection module includes a sensor, the sensor is used to non-contact measure the water level change of the water tank, the sensor includes multiple first capacitors, the first capacitor is used to sense the change of its relative dielectric constant caused by the water level change; the control module includes a second capacitor and an MCU controller, the MCU controller includes a first switch, a second switch, a third switch, a voltage input port, a reference port and multiple detection ports, one end of the first switch is connected to the voltage input port, the other end of the first switch is connected to the reference port, one end of the second switch is connected to the reference port, the other end of the second switch is respectively connected to each detection port, one end of the third switch is respectively connected to each detection port, the other end of the third switch is grounded, the reference port is connected to one end of the second capacitor, the other end of the second capacitor is grounded, each detection port is respectively connected to one end of the corresponding first capacitor, and the other end of each first capacitor is grounded, so that the sensitivity and signal-to-noise ratio of the water level detection device can be improved without affecting the water quality, and the measurement accuracy of the water level detection device can be improved.

[0023] Other features and advantages of the present invention will be described in the following description and will become apparent in part from the description. The purpose and other advantages of the present invention can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0026] Figure 1 It is an overall framework diagram of a water level detection device provided by some embodiments of the utility model;

[0027] Figure 2 It is a circuit structure diagram of a control module and a detection module provided in some embodiments of the utility model;

[0028] Figure 3 It is a circuit structure diagram of a transformer power supply module provided in some embodiments of the utility model;

[0029] Figure 4 It is an overall framework diagram of a water level detection system provided in some embodiments of the present utility model.

[0030] Figure numerals: water level detection device 1000, detection module 1100, sensor 1110, first capacitor 1111, fourth capacitor 1112, control module 1200, second capacitor 1210, MCU controller 1220, first switch 1221, second switch 1222, third switch 1223, voltage input port 1224, reference port 1225, detection port 1226, third capacitor 1227, detection resistor 1228, transformer power supply module 1300, transformer power supply input port 1310, voltage regulator 1320, transformer power supply output port 1330, transformer diode 1340, water level information upper limit module 1400, warning water level alarm module 1500, display drive module 1600, touch button module 1700, water tank 2000, insulating shell 2100, inner cavity 2200. DETAILED DESCRIPTION

[0031] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0032] In the description of the present utility model, if the first and second are described only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features, it should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] In the existing technology, most water detection methods generally use photoelectric liquid level sensors, float liquid level sensors, ultrasonic liquid level sensors or reed switch liquid level sensors for process measurement. However, during the measurement process, the photoelectric liquid level sensor is easily affected by sunlight, and the probe condenses water vapor and affects the measurement accuracy; during the measurement process, the float liquid level sensor and the reed switch liquid level sensor need to contact with the liquid and affect the water quality, and scale will be generated for a long time and affect the measurement accuracy; during the measurement process, the ultrasonic liquid level sensor is easily affected by suspended matter and air temperature and the measurement accuracy is affected, and there is a measurement blind spot.

[0035] Based on this, an embodiment of the utility model provides a water level detection device and a system thereof, which are provided with a detection module and a control module, the detection module includes a sensor, the sensor is used to non-contact measure the water level change of the water tank, the sensor includes multiple first capacitors, the first capacitor is used to sense the change of the relative dielectric constant of the water level change to itself; the control module includes a second capacitor and an MCU controller, the MCU controller includes a first switch, a second switch, a third switch, a voltage input port, a reference port and multiple detection ports, one end of the first switch is connected to the voltage input port, the other end of the first switch is connected to the reference port, one end of the second switch is connected to the reference port, the other end of the second switch is respectively connected to each detection port, one end of the third switch is respectively connected to each detection port, the other end of the third switch is grounded, the reference port is connected to one end of the second capacitor, the other end of the second capacitor is grounded, each detection port is respectively connected to one end of the corresponding first capacitor, and the other end of each first capacitor is grounded, and then the way of air detection by capacitors can improve the sensitivity and signal-to-noise ratio of the water level detection device without affecting the water quality, and improve the measurement accuracy of the water level detection device.

[0036] Therefore, the embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0037] Reference Figure 1 As shown, Figure 1 is an overall framework diagram of a water level detection device provided by some embodiments of the utility model, Figure 2It is a circuit structure diagram of a control module and a detection module provided by some embodiments of the utility model. The water level detection device 1000 includes a detection module 1100 and a control module 1200. The detection module 1100 includes a sensor 1110. The sensor 1110 is used to non-contactly measure the water level change of the water tank 2000. The sensor 1110 includes a plurality of first capacitors 1111. The first capacitors 1111 are used to sense the change in the relative dielectric constant of the water level change. The control module 1200 includes a second capacitor 1210 and an MCU controller 1220. The MCU controller 1220 includes a first switch 1221, a second switch 1222, a third switch 1223, a voltage input port 1224, a reference port 1225 and a plurality of detection ports 1226. One end of the first switch 1221 is connected to the voltage input port 1224. The input port 1224 is connected, the other end of the first switch 1221 is connected to the reference port 1225, one end of the second switch 1222 is connected to the reference port 1225, the other end of the first switch 1221 is respectively connected to each detection port 1226, one end of the third switch 1223 is respectively connected to each detection port 1226, the other end of the third switch 1223 is grounded, the reference port 1225 is connected to one end of the second capacitor 1210, the other end of the second capacitor 1210 is grounded, each detection port 1226 is respectively connected to one end of the corresponding first capacitor 1111, and the other end of each first capacitor 1111 is grounded. Therefore, the measurement accuracy of the water level detection device 1000 can be improved without affecting the water quality by performing air detection with capacitors.

[0038] It should be noted that the working principle between the above-mentioned detection module 1100 and the control module 1200 is described as follows. First, the control module 1200 controls the first switch 1221 to be intermittently turned on, so that the power input from the voltage input port 1224 charges the second capacitor 1210 through the first switch 1221, and keeps the voltage of the second capacitor 1210 at the set value Vref.

[0039] Then, the control module 1200 cyclically controls the second capacitor 1210 to be in a charging state and a discharging state, wherein, when the second capacitor 1210 is in a charging state, the second switch 1222 is in an on state and the third switch 1223 is in an off state; when the second capacitor 1210 is in a charging state, the second switch 1222 is in an off state and the third switch 1223 is in an on state.

[0040] Finally, the control module 1200 cyclically measures the conduction time of the first switch 1221 within a period of time to detect the capacitance value of the first capacitor 1111 corresponding to the multiple detection ports 1226; when the water level covers the detection position of the corresponding first capacitor 1111, the capacitance value of the corresponding first capacitor 1111 changes, and the control module 1200 can obtain the capacitance values ​​of different first capacitors 1111 to obtain the height of the current water level, thereby completing the processing logic of water level detection.

[0041] It should also be noted that the number of corresponding first capacitors 1111 and detection ports 1226 determines the detection height of the water level. The more the number of corresponding first capacitors 1111 and detection ports 1226 is, the more water level detection gears the water level detection device 1000 has, and thus the higher the measurement accuracy of the water level detection device 1000 is.

[0042] Further, from Figure 2 It can be seen that the control module 1200 also includes a third capacitor 1227, one end of the third capacitor 1227 is connected to the voltage input port 1224, and the other end of the third capacitor 1227 is grounded. The third capacitor 1227 is used to filter the input power of the voltage input port 1224, thereby reducing electromagnetic interference, improving the stability and reliability of the control module 1200, and improving the signal-to-noise ratio of the water level detection device 1000.

[0043] Further, refer to Figure 2 and Figure 3 As shown, Figure 3 This is a circuit structure diagram of a transformer power module 1300 provided in some embodiments of the utility model. The water level detection device 1000 also includes a transformer power module 1300. The transformer power module 1300 is connected in series between the third capacitor 1227 and the voltage input port 1224. The transformer power module 1300 includes a transformer power input port 1310, a voltage regulator 1320 and a transformer power output port 1330. The transformer power input port 1310 is connected to the input end of the voltage regulator 1320, and the output end of the voltage regulator 1320 is connected to the transformer power output port 1330, thereby being able to increase a stable and reliable voltage for the control module 1200.

[0044] Further, refer to Figure 3 As shown, the transformer power supply module 1300 also includes a transformer diode 1340, the positive terminal of the transformer diode 1340 is connected to the output terminal of the voltage regulator 1320, and the negative terminal of the transformer diode 1340 is connected to the input terminal of the voltage regulator 1320. The transformer diode 1340 is used as a voltage backflow protector of the voltage regulator 1320, thereby preventing voltage backflow when the output voltage exceeds the input voltage, thereby protecting the voltage regulator 1320 from damage due to reverse voltage.

[0045] It should be noted that the voltage of the transformer power output port 1330 is 5V, and the voltage of the transformer power input port 1310 is 12V.

[0046] Further, refer to Figure 2 As shown, the sensor 1110 also includes a fourth capacitor 1112, which is used to sense the change in the relative dielectric constant of the external air to itself. One end of the fourth capacitor 1112 is connected to the corresponding detection port 1226, and the other end of the fourth capacitor 1112 is grounded, so that the sensor 1110 can detect changes in the external environment and provide reference data for water level detection.

[0047] Further, refer to Figure 2 As shown, the control module 1200 also includes a plurality of detection resistors 1228, and the detection resistors 1228 are connected in series between the detection port 1226 and the corresponding first capacitor 1111, or the detection resistors 1228 are connected in series between the detection port 1226 and the fourth capacitor 1112. The detection resistors 1228 are used as anti-interference components of the first capacitor 1111 or the fourth capacitor 1112, thereby improving the anti-interference capability of the first capacitor 1111 or the fourth capacitor 1112, and improving the signal-to-noise ratio and sensitivity of the water level detection device 1000.

[0048] Further, refer to Figure 1 As shown, the water level detection device 1000 also includes a water level information upper limit module 1400, a warning water level alarm module 1500, a display driver module 1600 and a touch button module 1700. The water level information upper limit module 1400 is used to analyze the capacitance change value of the second capacitor 1210 to obtain the water level information of the water tank 2000. The warning water level alarm module 1500 is used to alarm according to the capacitance change value of the second capacitor 1210 to warn that the water level of the water tank 2000 has reached the warning value. The display driver module 1600 is used to display the processed data of the control module 1200. The touch button module 1700 is used as an operating component of the control module 1200, thereby making the function of the water level detection device 1000 more complete and improving the practicality of the water level detection device 1000.

[0049] Among them, the water level information upper limit module 1400 is connected to the control module 1200 , the warning water level alarm module 1500 is connected to the control module 1200 , the display drive module 1600 is connected to the control module 1200 , and the touch button module 1700 is connected to the control module 1200 .

[0050] Second, refer to Figure 4 As shown, Figure 4It is an overall framework diagram of a water level detection system provided by some embodiments of the utility model, wherein the water level detection system comprises a water tank 2000 and the water level detection device 1000 of the first aspect mentioned above, wherein the water tank 2000 comprises an insulating shell 2100 and an inner cavity 2200, the insulating shell 2100 is wrapped in the inner cavity 2200, and the sensor 1110 of the detection module 1100 is arranged relative to the insulating shell 2100 in the air, thereby being able to realize water level detection of the water tank 2000 without contacting the water tank 2000.

[0051] It should be understood that in the present utility model, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0052] In the several embodiments provided by the present utility model, it should be understood that the disclosed systems and principle methods can be implemented in other ways. For example, the system embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0053] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0054] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0055] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the utility model, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes multiple instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method of each embodiment of the utility model.

[0056] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A water level detection device, characterized in that: include: A detection module, the detection module comprising a sensor, the sensor being used for contactless measurement of water level changes in the water tank, the sensor comprising a plurality of first capacitors, the first capacitors being used for sensing changes in relative dielectric constants of the first capacitors due to changes in water level; A control module, the control module includes a second capacitor and an MCU controller, the MCU controller includes a first switch, a second switch, a third switch, a voltage input port, a reference port and multiple detection ports, one end of the first switch is connected to the voltage input port, the other end of the first switch is connected to the reference port, one end of the second switch is connected to the reference port, the other end of the second switch is respectively connected to each of the detection ports, one end of the third switch is respectively connected to each of the detection ports, the other end of the third switch is grounded, the reference port is connected to one end of the second capacitor, the other end of the second capacitor is grounded, each of the detection ports is respectively connected to one end of the corresponding first capacitor, and the other end of each of the first capacitors is grounded.

2. The water level detection device according to claim 1, characterized in that: The control module further includes a third capacitor, one end of the third capacitor is connected to the voltage input port, the other end of the third capacitor is grounded, and the third capacitor is used for filtering the input power of the voltage input port.

3. The water level detection device according to claim 2, characterized in that: The water level detection device also includes a transformer power supply module, which is connected in series between the third capacitor and the voltage input port. The transformer power supply module includes a transformer power supply input port, a voltage regulator and a transformer power supply output port. The transformer power supply input port is connected to the input end of the voltage regulator, and the output end of the voltage regulator is connected to the transformer power supply output port.

4. The water level detection device according to claim 3, characterized in that: The transformer power supply module also includes a transformer diode, the positive terminal of the transformer diode is connected to the output terminal of the voltage regulator, the negative terminal of the transformer diode is connected to the input terminal of the voltage regulator, and the transformer diode is used as a voltage backflow protector of the voltage regulator.

5. The water level detection device according to claim 3, characterized in that: The voltage of the transformer power output port is 5V, and the voltage of the transformer power input port is 12V.

6. The water level detection device according to claim 1, characterized in that: The sensor further includes a fourth capacitor, which is used to sense the change in relative dielectric constant of the external air to the sensor, one end of the fourth capacitor is connected to the corresponding detection port, and the other end of the fourth capacitor is grounded.

7. The water level detection device according to claim 6, characterized in that: The control module also includes multiple detection resistors, which are connected in series between the detection port and the corresponding first capacitor, or the detection resistor is connected in series between the detection port and the fourth capacitor. The detection resistor is used as an anti-interference component of the first capacitor or the fourth capacitor.

8. The water level detection device according to claim 1, characterized in that: The water level detection device also includes: A water level information upper limit module, the water level information upper limit module is connected to the control module, and the water level information upper limit module is used to analyze the capacitance change value of the second capacitor to obtain the water level information of the water tank; A warning water level alarm module is connected to the control module and is used for giving an alarm according to the capacitance change value of the second capacitor to warn that the water level of the water tank has reached a warning value.

9. The water level detection device according to claim 1, characterized in that: The water level detection device also includes: A display driving module, the display driving module is connected to the control module, and the display driving module is used to display the processed data of the control module; A touch key module, the touch key module is connected to the control module, and the touch key module is used as an operating component of the control module.

10. A water level detection system, characterized in that: include: A water tank, the water tank comprising an insulating shell and an inner cavity, the insulating shell is wrapped in the inner cavity, and the inner cavity is used to store water; The water level detection device according to any one of claims 1 to 9, wherein the sensor of the detection module is arranged in spaced relation to the insulating shell.

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