Hall type water level switch

Abstract

The utility model relates to the technical field of water level switches, and discloses a Hall type water level switch, which comprises a water level switch body and is characterized in that a floating ball in sliding fit with the water level switch body is arranged on the water level switch body; a plurality of magnets are arranged in the floating ball; a circuit board is arranged in the water level switch body; a Hall chip U1 is arranged on the circuit board; a VCC pin of the Hall chip U1 is connected with a capacitor C; a GND pin of the Hall chip U1 is grounded and forms a first wire end; the OUT pin of the Hall chip U1 is connected with a resistor R; the other end of R forms a second wire end; the first wire end and the second wire end are used for providing signal transmission for the Hall chip U1; according to the utility model, the Hall proximity switch can be simplified from an original three-wire wiring mode to a two-wire wiring mode, so that the requirement of an electronic product can be better met, and the trouble that the Hall switch can be accessed only by modifying a circuit is avoided.

Description

Technical Field

[0001] This utility model relates to the field of water level switch technology, and specifically to a Hall effect water level switch. Background Technology

[0002] A Hall effect water level switch is a device that uses the Hall effect to detect water level. It mainly consists of a Hall sensor and a magnetic float. When the magnetic float rises or falls to a specific position with the water level, the magnetic field it generates will trigger the Hall sensor, thereby outputting a corresponding electrical signal to monitor and control the water level. It has the advantages of high accuracy, strong stability and long life, and is widely used in various equipment and systems that require water level detection.

[0003] The following problems exist in the current market: the current Hall effect level switches are generally three-wire, so when connecting the Hall effect proximity switch to the product's circuit, the circuit needs to be adjusted to meet the three-wire connection requirements; the convenience and adaptability are poor.

[0004] The technical problem to be solved by this utility model is to provide a two-wire Hall level switch. Utility Model Content

[0005] The technical problem this utility model solves is to provide a two-wire Hall level switch, which simplifies the original three-wire wiring method of Hall proximity switches to a two-wire wiring method, making it more suitable for the needs of electronic products and avoiding the trouble of having to modify the circuit to connect the Hall switch. This allows the product to directly introduce the Hall level switch into the original two-wire circuit without modifying the circuit, greatly saving manpower and resources.

[0006] A Hall effect water level switch includes a water level switch body, a float ball that slides with the water level switch body, and a plurality of magnets inside the float ball; a circuit board inside the water level switch body; a Hall effect chip U1 on the circuit board; a capacitor C connected to the VCC pin of the Hall effect chip U1; a grounded GND pin of the Hall effect chip U1 forming a first terminal; a resistor R connected to the OUT pin of the Hall effect chip U1; and a second terminal formed by the other end of the resistor R; the first terminal and the second terminal are used to provide signal transmission to the Hall effect chip U1.

[0007] Preferably, the second line terminal is connected to resistors R1 and R2; and the first line terminal is connected to capacitor C1; and the other end of capacitor C1 is connected to the other end of resistor R2; and the other end of capacitor C1 is also connected to an external MCU.

[0008] Preferably, a thermistor NTC is also provided; one end of the thermistor NTC is connected to a resistor R3 and is connected to an external MCU; and a capacitor C2 is connected between the two ends of the thermistor NTC.

[0009] Preferably, the water level switch body has a baffle plate at one end near the float to limit the travel of the float; and the other end of the water level switch body has a fixed limiting part to limit the travel of the float.

[0010] Preferably, the fixing and limiting part is formed with a threaded section; and is provided with a flat washer that fits into the threaded section; and is provided with a nut that is threadedly connected to the threaded section.

[0011] Preferably, the other end of the water level switch body is provided with a cable that is electrically connected to the circuit board; and is provided with a terminal that is electrically connected to the cable.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the Hall effect water level switch of this utility model can simplify the original three-wire wiring method of the Hall effect proximity switch to a two-wire wiring method, which is more in line with the needs of electronic products and avoids the trouble of having to modify the circuit to connect the Hall effect switch; it allows the product to directly introduce the Hall effect water level switch into the original two-wire circuit without modifying the circuit, which greatly saves manpower and resources.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of one of the overall structures of this utility model.

[0016] Figure 2 This is a utility model Figure 1 A schematic diagram of the cross-sectional structure of the left section.

[0017] Figure 3 This is a schematic diagram of the Hall chip circuit of this utility model.

[0018] Figure 4 This is a schematic diagram of the Hall chip in actual application circuit of this utility model.

[0019] Figure 5 This is a schematic diagram of the overall structure of the present invention with the addition of a thermistor NTC.

[0020] Figure 6 This is a utility model Figure 5 A schematic diagram of the cross-sectional structure of the left section.

[0021] Figure 7 This is a schematic diagram of the Hall chip circuit incorporating an NTC thermistor, as described in this utility model.

[0022] Figure 8 This is a schematic diagram of the actual application circuit of the Hall chip with the addition of a thermistor NTC according to this utility model.

[0023] In the diagram: 1. Water level switch body; 2. Float; 3. Magnet; 4. Circuit board; 5. Baffle; 6. Fixed limit part; 7. Threaded section; 8. Flat washer; 9. Nut; 10. Cable; 11. Terminal; 12. Thermistor NTC. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] It should be noted that the terms "first," "second," etc., used in this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with this disclosure.

[0026] Please see Figures 1-8 In this embodiment of the present invention, a Hall effect water level switch includes a water level switch body 1; a float 2 that slides with the water level switch body 1; a plurality of magnets 3 inside the float 2; a circuit board 4 inside the water level switch body 1; a Hall effect chip U1 on the circuit board 4; a capacitor C connected to the VCC pin of the Hall effect chip U1; a grounded GND pin of the Hall effect chip U1 forming a first terminal; a resistor R connected to the OUT pin of the Hall effect chip U1; and a second terminal formed by the other end of the resistor R; the first terminal and the second terminal are used to provide signal transmission to the Hall effect chip U1.

[0027] Specifically, the liquid level deviation is determined by the change in the voltage of the magnetically driven chip; the Hall effect water level switch achieves non-contact liquid level detection based on the Hall effect; when the float 2 rises and falls with the water level, the change in the magnetic field strength generated by the magnet 3 inside it is sensed by the Hall chip U1; taking a unipolar Hall chip (such as SS443A) as an example, when the magnetic field strength exceeds the action point BOP (typical value 150 Gauss), the chip's OUT pin outputs a low level; when the magnetic field strength is lower than the release point BRP (typical value 50 Gauss), the OUT pin returns to a high level; the Hall chip U1 on the circuit board 4 is a key component for sensing and detecting magnetic fields using the Hall effect; the VCC pin of the Hall chip U1 is connected to capacitor C, which acts as a filter and stabilizes the voltage; during power supply, voltage fluctuations and noise interference may occur, and capacitor C can absorb these unstable factors, providing a relatively stable operating voltage for the Hall chip U1, ensuring that the Hall chip U1 can work normally; the GND pin of the Hall chip U1... The pin is grounded and forms the first line terminal, providing a stable reference potential for the entire circuit, enabling the Hall chip U1 to operate in a relatively stable potential environment, thus ensuring its reliability and stability.

[0028] The OUT pin of Hall chip U1 is connected to resistor R, which serves to limit current and adjust the signal. When Hall chip U1 detects a change in magnetic field and generates a corresponding electrical signal, it outputs the signal through the OUT pin. Resistor R limits the output current to prevent excessive current from damaging subsequent circuits. It also allows for appropriate adjustment of parameters such as the amplitude of the output signal, making it more suitable for transmission and processing by subsequent circuits. The other end of R forms a second terminal. The first and second terminals together constitute the signal transmission channel of Hall chip U1. The first terminal provides a stable reference potential, while the second terminal is responsible for transmitting the signal processed by Hall chip U1 so that it can be received and processed by external control circuits or other devices, thereby realizing the detection and corresponding control functions of changes in external magnetic field. This circuit design simplifies the Hall proximity switch from a three-wire connection to a two-wire connection, better meeting the needs of electronic products and avoiding the hassle of modifying the circuit to connect the Hall switch.

[0029] Furthermore, the second line is connected to resistors R1 and R2; and the first line is connected to capacitor C1; and the other end of capacitor C1 is connected to the other end of resistor R2; and the other end of capacitor C1 is also connected to an external MCU.

[0030] Specifically, the second terminal is connected to resistors R1 and R2. Resistor R1 is connected to the external power supply, where it serves a dual function of voltage division and current limiting. On the one hand, the voltage provided by the external power supply may be too high to be directly connected to other parts of the circuit. Resistor R1, through voltage division, can adjust the voltage to a suitable level, providing a stable operating voltage for subsequent circuits. On the other hand, it limits the amount of current flowing from the power supply into the circuit, preventing excessive current from damaging circuit components and ensuring the safe operation of the circuit. Capacitor C1 mainly serves to filter and stabilize the signal. During signal transmission, it may be affected by various electromagnetic interferences and noises, causing signal fluctuations and distortion. Capacitor C1 can effectively filter out these high-frequency interference signals, making the transmitted signal purer and more stable. At the same time, it can also compensate for phase differences and other issues during signal transmission to a certain extent, further improving signal quality and reliability.

[0031] Furthermore, a thermistor NTC is provided; one end of the thermistor NTC is connected to a resistor R3 and is connected to an external MCU; and a capacitor C2 is connected between the two ends of the thermistor NTC.

[0032] Specifically, the Hall effect water level switch achieves temperature compensation through the integration of an NTC thermistor, significantly improving the accuracy and reliability of liquid level detection. A temperature sensor monitors the ambient temperature in real time, and the MCU dynamically adjusts the Hall chip output threshold based on the NTC feedback data, effectively offsetting errors caused by temperature changes such as thermal expansion of the float material and magnetic field drift of the magnet. Within a wide temperature range of -40℃ to +85℃, the measurement accuracy is improved from ±2.5%FS to ±0.3%FS, the response time is shortened to 50ms, and the anti-interference capability is enhanced to 40dB. This enables the water level switch to operate stably in complex environments such as cold chain logistics, high-temperature industrial process control, and precision chemical reactors, greatly expanding its application scenarios and reducing system maintenance costs.

[0033] Furthermore, the water level switch body 1 has a baffle 5 at one end near the float 2 to limit the stroke of the float 2; and the other end of the water level switch body 1 has a fixed limiting part 6 to limit the stroke of the float 2.

[0034] Specifically, the mechanical limiting structure of the Hall effect water level switch precisely controls the stroke of the float 2 through the baffles 5 at both ends and the fixed limiting part 6, ensuring that it moves within the effective range and achieving accurate detection of the liquid level. This design has triple protection functions: first, it prevents the float 2 from being damaged by excessive displacement; second, it withstands the impact to protect the switch body when the liquid level is abnormal; and third, it reduces mechanical vibration and noise through a buffer structure. For example, the baffles 5 made of 304 stainless steel and the fixed limiting part 6 made of PA66+30%GF material can withstand a temperature range of -40℃ to +120℃ and have a service life of more than 5 years in salt spray environments, significantly improving the reliability and stability of the switch. It is suitable for industrial process control, water treatment systems and complex high and low temperature environments.

[0035] Furthermore, the other end of the water level switch body 1 is provided with a cable 10 that is electrically connected to the circuit board 4; and is provided with a terminal 11 that is electrically connected to the cable 10.

[0036] Specifically, the cable 10 and terminal 11 assembly of the Hall effect water level switch are electrically connected to the circuit board 4 to achieve reliable signal transmission and system integration; the cable 10 can be made of bend-resistant multi-strand twisted copper wire, with an outer PVC insulation sheath, and the protection level reaches IP67, which can effectively resist moisture and corrosion; the terminal 11 can be a plug-in design to support quick installation and maintenance.

[0037] Furthermore, the fixing and limiting part 6 is formed with a threaded section 7; and is provided with a flat washer 8 that fits into the threaded section 7; and is provided with a nut 9 that is threadedly connected to the threaded section 7.

[0038] Specifically, the threaded section 7, flat washer 8, and nut 9 of the fixed limiting part 6 constitute a fastening and adjustment structure. By screwing the nut 9 onto the threaded section 7, the tightness and waterproofing of the cable 10 connection can be increased. The flat washer 8 can increase the contact area, distribute pressure, and prevent damage to the surface of the water level switch body 1 when the nut 9 is tightened. At the same time, it plays a role in preventing loosening and damping, ensuring that the limiting structure is stable and reliable, and ensuring the long-term stable operation of the water level switch.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A Hall effect water level switch, comprising a water level switch body (1), characterized in that, The water level switch body (1) is provided with a float (2) that slides with it; and the float (2) is provided with several magnets (3); and the water level switch body (1) is provided with a circuit board (4); and the circuit board (4) is provided with a Hall chip U1; and the VCC pin of the Hall chip U1 is connected to a capacitor C; and the GND pin of the Hall chip U1 is grounded and forms a first line terminal; and the OUT pin of the Hall chip U1 is connected to a resistor R; and the other end of R forms a second line terminal; and the first line terminal and the second line terminal are used to provide signal transmission to the Hall chip U1.

2. A Hall effect water level switch according to claim 1, characterized in that, The second line is connected to resistors R1 and R2; and the first line is connected to capacitor C1; the other end of capacitor C1 is connected to the other end of resistor R2; and the other end of capacitor C1 is also connected to an external MCU.

3. A Hall effect water level switch according to claim 2, characterized in that, It also includes a thermistor NTC; one end of the thermistor NTC is connected to a resistor R3 and is connected to an external MCU; and a capacitor C2 is connected between the two ends of the thermistor NTC.

4. A Hall effect water level switch according to claim 1, characterized in that, The water level switch body (1) has a baffle (5) at one end near the float (2) to limit the stroke of the float (2); and the other end of the water level switch body (1) has a fixed limiting part (6) to limit the stroke of the float (2).

5. A Hall effect water level switch according to claim 4, characterized in that, The fixed limiting part (6) is formed with a threaded section (7); and is provided with a flat washer (8) that fits into the threaded section (7); and is provided with a nut (9) that is threadedly connected to the threaded section (7).

6. A Hall effect water level switch according to claim 1, characterized in that, The other end of the water level switch body (1) is provided with a cable (10) that is electrically connected to the circuit board (4); and is provided with a terminal (11) that is electrically connected to the cable (10).

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