Double-submersible-pump water pumping device based on water level induction

Abstract

The invention relates to a double-submersible-pump water pumping device based on water level induction in the technical field of drainage control. The double-submersible-pump water pumping device comprises an execution mechanism composed of a high-position water pump, a low-position water pump and an alternating current contactor, an air pressure type water level detection unit and a control module. The air pressure type water level detection unit comprises bell-jar-shaped shells which are respectively arranged in a high position and a low position of the water tank, and the bell-jar-shaped shells are opened downwards and are communicated with inner cavities of the corresponding sealed water level switches through hollow pipes; the control module judges the water level height and the water level change rate according to signals output by the water level detection unit and controls start-stop combination of the high-level water pump and the low-level water pump, and single-pump operation or double-pump simultaneous operation is achieved. The air pressure type water level detection units are arranged at the high position and the low position of the pool respectively, water level changes are monitored in real time, the water level change rate judgment module is introduced, and starting and stopping combination of the high-low position water pumps is intelligently controlled. And the system has delayed starting and abnormal alarm functions, so that the response speed, the drainage efficiency and the reliability of the system are improved.

Description

Technical Field

[0001] This invention relates to the field of drainage control technology, specifically a dual submersible pump pumping device based on water level sensing, which is particularly suitable for situations where water level changes drastically and efficient drainage is required. Background Technology

[0002] Currently, drainage of underground water pits is mostly controlled by a single pump combined with a float switch or an electrode-type water level detection device. While this type of system is simple in structure, the drainage capacity of a single pump is insufficient when the water level rises rapidly, easily leading to overflow. Some dual-pump systems can operate simultaneously, but they lack a mechanism to intelligently adjust the pump operation strategy based on water level changes, often resulting in energy waste or delayed response. Furthermore, traditional electrode-type detection devices are susceptible to water quality issues, accumulating scale and causing control malfunctions. Summary of the Invention

[0003] The present invention aims to solve the problems of insufficient drainage capacity of single pump, limited control strategy of dual pump, and easy failure of water level detection in the prior art, and provides a dual submersible pumping device based on water level sensing.

[0004] To address the aforementioned problems, this invention provides a dual submersible pump pumping device based on water level sensing, comprising a high-level water pump, a low-level water pump, an actuator composed of an AC contactor, a pneumatic water level detection unit, and a control module. The pneumatic water level detection unit includes a bell-shaped housing installed in the high position and the low position of the water tank, with its opening facing downwards and connected to the inner cavity of the corresponding sealed water level switch through a hollow tube. The control module determines the water level height and rate of change based on the signal output by the water level detection unit, and controls the start-stop combination of the high-level water pump and the low-level water pump to achieve single-pump operation or simultaneous operation of two pumps.

[0005] Furthermore, the bell-shaped shell in the high position of the pool is installed 50 mm below the highest water level. At 200mm; The bell-shaped housing in the lower part of the water tank is installed 30 mm above the lowest point of the water pump pipe. At 80mm.

[0006] Furthermore, the control module includes a water level change rate judgment unit, which is used to determine whether to start the dual-pump operation mode based on the time change rate of the water level detection signal.

[0007] Furthermore, when the rate of change of water level exceeds a set threshold, the control module simultaneously starts the high-level water pump and the low-level water pump. When the rate of change of water level is lower than the set threshold, only the low-level water pump is activated.

[0008] Furthermore, it also includes a delayed start module, which delays the start of the high-level water pump after the water level reaches the start threshold, thus avoiding frequent start-stop cycles.

[0009] Furthermore, the bell-shaped shell is hemispherical, cylindrical, or square, and has a hollow flange at the top for connecting the hollow tube.

[0010] Furthermore, the water level sensing-based dual submersible pump pumping device also includes a manual / automatic switching switch, used to switch to manual control mode in case of automatic control failure.

[0011] Furthermore, the dual submersible pump pumping device based on water level sensing is also equipped with a water level abnormality alarm module, which triggers an audible and visual alarm when the water level continues to rise above the safe water level.

[0012] The working principle of the pneumatic water level detection unit in this scheme is based on Pascal's law and the principle of communicating vessels. It indirectly and non-contactly measures the water level by detecting the static pressure change of a sealed air column. Its working process is a complete chain of "physical quantity conversion-transmission-action".

[0013] The core technology lies in the air-circuit system formed by the bell-shaped cavity and the sealed water level switch via a hollow pipe. The bell-shaped cavity is fixedly installed near the water level to be measured in the pool, with its opening vertically downwards immersed in the water. The cavity is filled with air and connected to the inner cavity of the sealed water level switch, which is installed in a dry environment, via a sealed hollow pipe, forming a completely sealed air pressure transmission system.

[0014] When the water level in the pool is lower than the opening of the bell-shaped cavity, the gas inside the cavity is freely connected to the atmosphere through the opening, and the entire system is under normal pressure. The sensing diaphragm inside the sealed water level switch is not affected by the pressure difference, and its connected moving contact rod is in the initial position, with the electrical contact in the "open" state.

[0015] As the water level rises and begins to submerge the opening of the bell-shaped cavity, the water seals the opening. As the water level continues to rise, the column of water flowing into the cavity compresses the air inside. According to Pascal's law, the pressure exerted by the depth of the liquid acts directly on the sealed gas. The compressed air decreases in volume, and its pressure increases. This increased pressure is transmitted without loss through the hollow tube, which acts as a communicating vessel, to the sealed inner cavity of the water level switch at the far end.

[0016] Inside the water level switch, increased air pressure acts on a flexible diaphragm or bellows, generating an upward thrust. When the water level rises to a preset height (e.g., corresponding to a pressure increase of 0.5-1.0 kPa), this thrust is sufficient to overcome the restoring force of the spring or diaphragm itself, causing a displacement of the mechanical linkage mechanism (such as a lever or contact rod) connected to the diaphragm. This mechanical displacement ultimately drives the internal microswitch or reed switch to operate, changing the electrical contact state from "open" to "closed," thereby outputting an electrical signal indicating that the water level has been reached.

[0017] Conversely, when the water level drops and the opening of the bell jar cavity re-exposes the water surface, the sealed air passage is reconnected to the atmosphere, and the system pressure returns to normal. The spring return force inside the water level switch causes the diaphragm and contact rod to return to their original positions, and the electrical contacts return to the "open" state, outputting a "water level below" signal.

[0018] In this dual-pump control scheme, this principle is innovatively applied to achieve intelligent hierarchical control: one detection unit is installed in the low-level water tank, which can be set with two switches corresponding to different pressure thresholds, respectively corresponding to the "low-level start" and "high-level linkage start" water levels; another detection unit is installed in the high-level water tank to monitor the high water level to achieve stop or alarm. Its fundamental advantage is that the detection component (bell housing) has no electrical contact with the water, and only transmits signals through air pressure, thus completely solving the problem of failure caused by scaling and corrosion of electrode-type detection. It is particularly suitable for complex water quality situations such as underground water pits, ensuring long-term reliability and stability.

[0019] This invention utilizes pneumatic water level detection units installed at both the high-level and low-level sections of the water tank to monitor water level changes in real time. It also incorporates a water level change rate judgment module to intelligently control the start-stop combination of the high- and low-level water pumps. The device can automatically select single-pump or dual-pump operating modes based on the water level rise rate and features delayed start-up and abnormal alarm functions, improving the system's response speed, drainage efficiency, and reliability.

[0020] The beneficial effects of this invention are: 1. The system intelligently switches between single and dual pump modes based on the rate of water level change, ensuring both drainage efficiency and energy conservation. 2. It adopts air pressure detection, with no electrodes in contact with the water source, thus avoiding the accumulation of dirt; 3. When the water level changes abruptly, both pumps start simultaneously, significantly increasing the drainage speed; 4. Modular design, easy to install and troubleshoot; 5. It is equipped with alarm and manual switching functions to improve system security. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of a dual submersible pump pumping device based on water level sensing according to the present invention.

[0022] Figure 2 This is a circuit wiring diagram of Embodiment 1 of a dual submersible pump pumping device based on water level sensing according to the present invention.

[0023] In the diagram, there is a water tank 1, a high-level water pump 2, a water level switch A, a bell-shaped housing A, a low-level water pump 3, a water level switch B, and a bell-shaped housing B. Detailed Implementation

[0024] The following detailed description illustrates the specific implementation method: Example 1, basically as shown in the attached document. Figure 1 and Figure 2 As shown: A dual submersible pump pumping device based on water level sensing includes a high-level water pump 2 (corresponding to water level switch A and bell-shaped housing A), a low-level water pump 3 (corresponding to water level switch B and bell-shaped housing B), an actuator composed of an AC contactor, a pneumatic water level detection unit, a control module, and a delayed start module.

[0025] The high-level section of pool 1 is equipped with a high-level water pump 2, and a bell-shaped housing A (150ml capacity) is fixed 50 mm below the highest water level line on the pool wall. At 200mm, the opening faces downwards, 100mm below the highest water level line at the top of the pool.

[0026] The lower part of pool 1 is equipped with a low-level water pump 3, and a bell-shaped housing B (of the same volume) is fixed 30 mm above the lowest point of the water pump pipe on the pool wall. At 80mm, the opening is downward, 50mm above the lowest point of the water inlet of the pump pipe.

[0027] The bell-shaped housings (A, B) are hemispherical, cylindrical, or square, with the cylindrical shape being preferred in this design. The hollow flange at the top of each bell-shaped housing is connected to a corresponding sealed water level switch via a plastic flexible tube (hollow tube). The high-level water pump 2 corresponds to water level switch A and bell-shaped housing A, and the low-level water pump 3 corresponds to water level switch B and bell-shaped housing B. The sealed water level switches are installed in a dry location outside the water tank 1.

[0028] The control module includes a water level change rate judgment unit, which determines whether to activate the dual-pump operation mode based on the time change rate of the water level detection signal. The control module determines the water level height and water level change rate based on the signal output by the water level detection unit, and controls the start / stop combination of the high-level pump 2 and the low-level pump 3 to achieve single-pump operation or simultaneous operation of both pumps.

[0029] When the rate of change of water level exceeds the set threshold, the control module simultaneously starts the high-level water pump 2 and the low-level water pump 3. When the rate of change of water level is lower than the set threshold, only the low-level water pump 3 is activated.

[0030] The delayed start module is used to delay the start of the high-level water pump 2 after the water level reaches the start threshold, thus avoiding frequent start-stop.

[0031] This embodiment also includes a water level anomaly alarm module, which triggers an audible and visual alarm when the water level continues to rise above the safe water level.

[0032] The water tank 1 is equipped with a control cabinet, which contains an AC contactor, control module, delay module, alarm module, etc.

[0033] Example 2: Compared to Example 1, a manual / automatic switch is used to switch to manual control mode in case of automatic control failure. The system supports manual mode for easy maintenance or emergency operation.

[0034] The workflow of this invention is as follows: After the system is powered on, the control module continuously receives water level detection signals. If the water level in the low-level water tank 1 reaches the start threshold and the water level changes slowly, only the low-level water pump 3 is started. If a rapid rise in water level is detected (the rate of change exceeds the threshold), both the high-level water pump 2 and the low-level water pump 3 are started simultaneously. The high-level water pump 2 has a delayed start function to avoid frequent start-stop due to small fluctuations in water level. If the water level continues to rise above the safe water level, an audible and visual alarm is triggered.

[0035] Taking a water storage height of 1000mm as an example, the linkage logic of the two water pumps is shown in Table 1 below (which can be set via the control module knob or interface). Table 1:

[0036] The high-level water pump 2 has a 10-second start delay to avoid frequent start-stop cycles caused by small fluctuations in water level.

[0037] The alarm water level is set to 200mm from the top of the pool. Exceeding this value will trigger an audible and visual alarm.

[0038] Workflow details Scenario 1: Normal slow water inflow (such as daily seepage) The water level rises slowly from the low starting level (300mm) at a rate of <5cm / min.

[0039] The control module closes only the AC contactor KM1 to start the low-level water pump 3.

[0040] When the water level drops to the stop level (100mm), KM1 disconnects and the water pump stops.

[0041] Scenario 2: Rapid water ingress (such as heavy rain or water gushing from pipes) The water level rose rapidly at a rate greater than 5 cm / min and exceeded 300 mm.

[0042] The control module simultaneously closes KM1 and KM2, starting both water pumps.

[0043] Once the water level begins to drop and the rate falls below the threshold, KM2 disconnects, the high-level pump stops, and the low-level pump continues to run until the water level drops to 100mm.

Claims

1. A dual submersible pump pumping device based on water level sensing, comprising a high-level water pump, a low-level water pump, an actuator composed of an AC contactor, a pneumatic water level detection unit, and a control module; characterized in that: The pneumatic water level detection unit includes a bell-shaped housing installed in the high position and the low position of the water tank, with its opening facing downwards and connected to the inner cavity of the corresponding sealed water level switch through a hollow tube. The control module determines the water level height and rate of change based on the signal output by the water level detection unit, and controls the start-stop combination of the high-level water pump and the low-level water pump to achieve single-pump operation or simultaneous operation of two pumps.

2. The dual submersible pump pumping device based on water level sensing according to claim 1, characterized in that: The bell-shaped shell in the high-level water tank is installed 50 mm below the highest water level. At 200mm; The bell-shaped housing in the lower part of the water tank is installed 30 mm above the lowest point of the water pump pipe. At 80mm.

3. The dual submersible pump pumping device based on water level sensing according to claim 1, characterized in that: The control module includes a water level change rate judgment unit, which is used to determine whether to start the dual-pump operation mode based on the time change rate of the water level detection signal.

4. A dual submersible pump pumping device based on water level sensing according to claim 3, characterized in that: When the rate of change of water level exceeds the set threshold, the control module starts both the high-level water pump and the low-level water pump simultaneously. When the rate of change of water level is lower than the set threshold, only the low-level water pump is activated.

5. A dual submersible pump pumping device based on water level sensing according to claim 1, characterized in that: It also includes a delayed start module, which delays the start of the high-level water pump after the water level reaches the start threshold, thus avoiding frequent start-stop cycles.

6. A dual submersible pump pumping device based on water level sensing according to claim 1, characterized in that: The bell-shaped shell is hemispherical, cylindrical, or square, and has a hollow flange at the top for connecting the hollow tube.

7. A dual submersible pump pumping device based on water level sensing according to claim 1, characterized in that: The water level sensing-based dual submersible pump pumping device also includes a manual / automatic switching switch, used to switch to manual control mode in case of automatic control failure.

8. A dual submersible pump pumping device based on water level sensing according to claim 1, characterized in that: The dual submersible pump pumping device based on water level sensing is also equipped with a water level abnormality alarm module, which triggers an audible and visual alarm when the water level continues to rise above the safe water level.

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