Long distance water tank liquid level and water pump interlocking circuit

Abstract

The utility model relates to a long distance water tank liquid level and water pump interlocking circuit, including water tank, the water tank is provided with pipeline, is provided with electric valve between pipeline and water tank, the other end of pipeline is provided with water pump, is provided with electric contact pressure gauge in the position close to water pump, and electric contact pressure gauge sets up on the pipeline for detecting pipeline pressure, the output of electric contact pressure gauge is connected with acquisition circuit, and acquisition circuit includes amplifier circuit and filter circuit, and the output of acquisition circuit is connected with controller, and controller is provided with drive circuit, and drive circuit connects water pump, and water pump passes through drive circuit and connects power supply, water pump still is connected with switch, and switch is parallelly connected with drive circuit, and water pump connects power supply through switch. The utility model sets up electric contact pressure gauge and detects pipeline water pressure, and combines acquisition circuit, controller and drive circuit and carries out control to water pump, and controller and liquid level sensor do not need wiring between, realize boiler hot water tank water replenishment automatic control.

Description

Technical Field

[0001] This utility model relates to the field of boiler hot water tank control technology, specifically to a long-distance water tank level and water pump interlocking circuit. Background Technology

[0002] The boiler's hot water tank cannot operate without water, so timely water replenishment is necessary. The current control method involves using a level sensor in conjunction with a controller for water replenishment. When the detected level in the boiler's hot water tank falls below a set minimum threshold, the controller activates the water pump and opens the electric valve to replenish water. When the detected level exceeds a set maximum threshold, the controller stops the solenoid valve and water pump. However, due to the large plant area, the water source pipeline is several kilometers away from the boiler's hot water tank. Achieving interlocking control would require laying several kilometers of control cable, which is extremely difficult and costly, and maintenance costs are also high after construction. Wireless communication suffers from signal attenuation and is prone to failure over long distances.

[0003] Therefore, there is an urgent need for a long-distance water tank level and water pump interlocking circuit that eliminates the need for control lines and enables automatic water replenishment of the boiler hot water tank. Summary of the Invention

[0004] To address the problem of difficulty in automatically controlling existing boiler hot water tank replenishment systems, this invention proposes a long-distance water tank level and water pump interlocking circuit. The circuit uses pipeline pressure to reflect the water level in the boiler hot water tank, employs an electrical contact pressure gauge to detect pipeline water pressure, and combines a data acquisition circuit, a controller, and a drive circuit to control the water pump. This eliminates the need for long-distance wiring and achieves automatic control of boiler hot water tank replenishment.

[0005] To achieve the above objectives, this utility model proposes a long-distance water tank level and water pump interlocking circuit, including a water tank, a pipe installed in the water tank, an electric valve installed between the pipe and the water tank, a water pump installed at the other end of the pipe, and an electric contact pressure gauge installed near the water pump. The electric contact pressure gauge is installed on the pipe for detecting the pipe pressure.

[0006] The output terminal of the electric contact pressure gauge is connected to a data acquisition circuit, which includes an amplification circuit and a filtering circuit. The output terminal of the data acquisition circuit is connected to a controller, which is equipped with a drive circuit. The drive circuit is connected to a water pump, and the water pump is connected to a power supply through the drive circuit.

[0007] The water pump is also connected to a switch, which is connected in parallel with the drive circuit, and the water pump is connected to the power supply through the switch.

[0008] Furthermore, the amplification circuit includes an instrument amplification chip, the filtering circuit includes an RC filter circuit, the input terminal of the instrument amplification chip is connected to the output terminal of the electrical contact pressure gauge, the output terminal of the instrument amplification chip is connected to the RC filter circuit, and the output terminal of the RC filter circuit is connected to the controller.

[0009] The electrical signal output from the pressure gauge is processed by an instrument amplifier chip and an RC filter circuit to improve signal accuracy.

[0010] Furthermore, the drive circuit includes a transistor drive circuit, a relay, and a contactor, and the water pump is connected to the power supply through the normally open contact of the contactor to form a circuit;

[0011] The coil of the contactor is connected to the normally open contact of the relay. The transistor drive circuit includes a transistor, the base of which is connected to the output terminal of the controller, the emitter of which is grounded, and the collector of which is connected to the coil of the relay.

[0012] The circuit structure is simple and easy to modify and maintain.

[0013] Furthermore, the coil of the contactor is also connected to the switch, the normally open contacts of the switch and the relay are connected in parallel, and the coil of the contactor is connected to the power supply through the switch to form a circuit.

[0014] The switch is configured to control the water pump and improve circuit stability when the controller malfunctions.

[0015] Furthermore, the controller includes an MCU chip, the MCU chip is provided with peripheral circuitry, the peripheral circuitry includes a button unit and a display screen, the button unit includes multiple buttons, and the multiple buttons are connected to the input terminal of the MCU chip;

[0016] The display screen is communicatively connected to the MCU chip.

[0017] Setting up peripheral circuits facilitates human-computer interaction and parameter setting.

[0018] Furthermore, it also includes a control box, in which the acquisition circuit, controller, drive circuit and switch are located.

[0019] The beneficial effects of this utility model through the above technical solution are as follows:

[0020] This invention enables automatic water replenishment of a boiler hot water tank. An electrical contact pressure gauge is installed on the pipeline near the water pump to detect pipeline pressure. Utilizing the difference in pipeline pressure when the boiler hot water tank has water and when it is low on water, the water level detection is converted into pipeline pressure detection to reflect the water level in the boiler hot water tank. Combining a data acquisition circuit, controller, and drive circuit, automatic water replenishment is achieved without long-distance wiring. Compared to traditional solutions, this significantly reduces wiring costs and construction difficulty, lowers signal attenuation and failure risks, provides accurate signal processing, and ensures reliable water replenishment. The data acquisition circuit uses an instrumentation amplifier chip and an RC filter circuit to improve signal accuracy and stability. The controller precisely controls the water pump accordingly, preventing abnormal water replenishment and maintaining a stable water tank level. The circuit features a dual control mechanism with a switch and drive circuit connected in parallel. The controller automatically controls the water pump under normal conditions; in case of abnormalities, manual control via the switch ensures uninterrupted water replenishment. The controller is equipped with a button unit and a display screen, allowing operators to easily set parameters and view the operating status. Attached Figure Description

[0021] Figure 1 This is a circuit diagram of a long-distance water tank level and water pump interlocking circuit according to the present invention;

[0022] Figure 2 This is a schematic diagram of a long-distance water tank level and water pump interlocking circuit according to the present invention.

[0023] Reference numerals: 1. Water tank; 2. Pipe; 3. Electric valve; 4. Water pump; 5. Electrical contact pressure gauge; 6. Data acquisition circuit; 7. Controller; 8. Drive circuit; 9. Switch; 10. Button unit; 11. Display screen. Detailed Implementation

[0024] Example 1

[0025] like Figures 1-2 As shown, a long-distance water tank level and water pump interlocking circuit includes a water tank 1, a pipe 2 provided in the water tank 1, an electric valve 3 provided between the pipe 2 and the water tank 1, a water pump 4 provided at the other end of the pipe 2, and an electric contact pressure gauge 5 provided near the water pump 4. The electric contact pressure gauge 5 is provided on the pipe 2 for detecting the pressure of the pipe 2.

[0026] The output terminal of the electric contact pressure gauge 5 is connected to the acquisition circuit 6, which includes an amplification circuit and a filtering circuit. The output terminal of the acquisition circuit 6 is connected to the controller 7, which is equipped with a drive circuit 8. The drive circuit 8 is connected to the water pump 4, and the water pump 4 is connected to the power supply through the drive circuit 8.

[0027] The water pump 4 is also connected to a switch 9, which is connected in parallel with the drive circuit 8. The water pump 4 is connected to the power supply through the switch 9.

[0028] The amplification circuit includes an instrument amplification chip, and the filtering circuit includes an RC filter circuit. The input terminal of the instrument amplification chip is connected to the output terminal of the electrical contact pressure gauge 5, and the output terminal of the instrument amplification chip is connected to the RC filter circuit. The output terminal of the RC filter circuit is connected to the controller 7.

[0029] The drive circuit 8 includes a transistor drive circuit, a relay and a contactor, and the water pump 4 is connected to the power supply through the normally open contact of the contactor to form a circuit.

[0030] The coil of the contactor is connected to the normally open contact of the relay. The transistor drive circuit includes a transistor. The base of the transistor is connected to the output terminal of the controller 7, the emitter of the transistor is grounded, and the collector of the transistor is connected to the coil of the relay.

[0031] The coil of the contactor is also connected to the switch 9. The switch 9 and the normally open contact of the relay are connected in parallel. The coil of the contactor is connected to the power supply through the switch 9 to form a circuit.

[0032] The controller 7 includes an MCU chip, the MCU chip is provided with peripheral circuitry, the peripheral circuitry includes a button unit 10 and a display screen 11, the button unit 10 includes multiple buttons, and the multiple buttons are connected to the input terminal of the MCU chip;

[0033] The display screen 11 is connected to the MCU chip for communication.

[0034] It also includes a control box, inside which the acquisition circuit 6, controller 7, drive circuit 8 and switch 9 are located.

[0035] In this embodiment, the MCU chip is an STM32 microcontroller, the switch 9 is an air switch, the instrument amplifier chip is an AD8250 chip, the electrical contact pressure gauge 5 is a YX-150 voltage pressure gauge, and the display screen 11 is an LED display screen.

[0036] During operation, the electric valve 3 is in the normally open state. The electric contact pressure gauge 5 is installed on the pipe 2 near the water pump 4 to monitor the pressure in the pipe 2 in real time. When the water level in the water tank 1 drops or rises, and the pressure in the pipe 2 changes, the electric contact pressure gauge 5 converts the pressure signal into an electrical signal output.

[0037] The electrical signal output from the pressure gauge 5 is transmitted to the acquisition circuit 6. The amplification circuit (AD8250 chip) in the acquisition circuit 6 amplifies the signal, increasing its strength for subsequent processing. Next, the amplified signal enters the filtering circuit (RC filter circuit) to remove noise interference, making the signal more stable and accurate. The processed signal is then transmitted to the controller 7. The controller 7 contains an MCU chip, which analyzes and processes the signal after receiving it from the acquisition circuit 6. Based on preset pressure thresholds (lower and upper pressure thresholds), it determines whether the water pump 4 needs to be activated to replenish water. When the detected pressure is lower than the set lower pressure threshold, it indicates that the water level in the tank is low and water needs to be added.

[0038] The MCU chip of controller 7 sends a control signal to the drive circuit 8 through its output terminal. In the transistor drive circuit 8, after receiving the control signal from controller 7, the transistor's base conducts, creating a path between the collector and emitter. Current flows through the relay coil, closing the relay's normally open contact. The closing of the relay's normally open contact energizes the contactor coil, closing the contactor's normally open contact. The water pump 4 is then connected to the power supply through the contactor's normally open contact, forming a circuit. The water pump 4 starts, beginning to replenish water to the water tank 1.

[0039] During the water pump 4's water replenishment process, the electrical contact pressure gauge 5 continuously monitors the pressure in pipe 2. When the water level in tank 1 rises and the pressure in pipe 2 reaches the set upper limit pressure threshold, the controller 7 receives the corresponding signal, and the MCU chip sends a control signal to cut off the transistor, de-energize the relay coil, open the normally open contact, de-energize the contactor coil, open its normally open contact, and the water pump 4 stops working, completing the automatic water replenishment process.

[0040] Example 2

[0041] Based on the automatic water replenishment process in Example 1, Example 2 describes manual water replenishment.

[0042] When water pump 4 needs to be manually started for water replenishment, the operator presses switch 9. Switch 9 is connected in parallel with drive circuit 8, and the contactor coil is also connected to switch 9 (switch 9 and the normally open contact of the relay are connected in parallel). After switch 9 is pressed, current flows through switch 9 to directly power the contactor coil, energizing the contactor coil and causing the normally open contact of the contactor to close.

[0043] Water pump 4 is connected to the power supply through the normally open contact of the contactor, forming a circuit. Water pump 4 starts and begins to replenish water to water tank 1. When the operator believes that the water tank 1 has been replenished to the required level, switch 9 is pressed again. Switch 9 is opened, the coil of the contactor is de-energized, its normally open contact opens, and water pump 4 stops working, completing the manual water replenishment process.

[0044] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A long-distance water tank level and water pump interlocking circuit, comprising a water tank (1), wherein the water tank (1) is provided with a pipe (2), an electric valve (3) is provided between the pipe (2) and the water tank (1), and a water pump (4) is provided at the other end of the pipe (2), characterized in that, An electric contact pressure gauge (5) is arranged near the water pump (4) and is arranged on the pipeline (2) to detect the pressure of the pipeline (2); An acquisition circuit (6) is connected to the output end of the electric contact pressure gauge (5), the acquisition circuit (6) comprises an amplification circuit and a filter circuit, the output end of the acquisition circuit (6) is connected to a controller (7), the controller (7) is provided with a driving circuit (8), the driving circuit (8) is connected to the water pump (4), and the water pump (4) is connected to a power supply through the driving circuit (8); The water pump (4) is also connected to a switch (9), the switch (9) is connected in parallel with the driving circuit (8), and the water pump (4) is connected to the power supply through the switch (9).

2. A long distance water tank level and water pump interlocking circuit according to claim 1, characterized in that, The amplification circuit comprises an instrument amplification chip, the filter circuit comprises an RC filter circuit, the input end of the instrument amplification chip is connected to the output end of the electric contact pressure gauge (5), the output end of the instrument amplification chip is connected to the RC filter circuit, and the output end of the RC filter circuit is connected to the controller (7).

3. A long distance water tank level and water pump interlocking circuit according to claim 1, characterized in that, The driving circuit (8) comprises a transistor driving circuit, a relay and a contactor, the water pump (4) is connected to the power supply through the normally open contact of the contactor to form a loop; The coil of the contactor is connected to the normally open contact of the relay, the transistor driving circuit comprises a transistor, the base of the transistor is connected to the output end of the controller (7), the emitter of the transistor is grounded, and the collector of the transistor is connected to the coil of the relay.

4. A long distance water tank level and water pump interlocking circuit according to claim 3, characterized in that, The coil of the contactor is also connected to the switch (9), the switch (9) and the normally open contact of the relay are connected in parallel, and the coil of the contactor is connected to the power supply through the switch (9) to form a loop.

5. A long distance water tank level and water pump interlocking circuit according to claim 1, characterized in that, The controller (7) comprises an MCU chip, the MCU chip is provided with a peripheral circuit, the peripheral circuit comprises a key unit (10) and a display screen (11), the key unit (10) comprises a plurality of keys, and the plurality of keys are connected to the input end of the MCU chip; The display screen (11) is in communication connection with the MCU chip.

6. A long distance water tank level and water pump interlocking circuit according to claim 1, characterized in that, A control box is further included, and the acquisition circuit (6), the controller (7), the driving circuit (8) and the switch (9) are arranged in the control box.

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