An automatic control system for submersible pumps

Abstract

The application relates to the technical field of submersible pump control, in particular to a submersible pump automatic control system. The system comprises a pipeline arranged in a water pool and internally provided with a submersible pump; and a differential pressure transmitter, high-pressure and low-pressure ports of which are arranged on the inner side of the pipeline and located at two ends of the submersible pump respectively. In the application, when the differential pressure detected by the differential pressure transmitter exceeds the preset range, it indicates that the differential pressure at the two ends of the submersible pump exceeds the reasonable range, and the submersible pump is blocked to a certain extent. The first end of the switching valve is communicated with the third end of the switching valve, so that the water extracted in the submersible pump is mixed with the water in the water pool again, the sediment residues in the water pool are mixed with the water in the water pool, the sediment residues are prevented from gathering, the submersible pump is prevented from being blocked, the differential pressure at the two ends of the submersible pump is reduced, and the extraction effect of the submersible pump on the residual water in the pool bottom is improved.

Description

Technical Field

[0001] This invention relates to the field of submersible pump control technology, and more specifically to an automatic control system for submersible pumps. Background Technology

[0002] Submersible pumps are used to extract water from the bottom of pools. Traditionally, submersible pumps are controlled manually by observing their operation. However, this method can lead to problems. As the water level decreases, sediment buildup can cause the submersible pump to become less effective at extracting the remaining water from the bottom of the pool. Summary of the Invention

[0003] In view of this, the present invention provides an automatic control system for submersible pumps to solve the problem that the accumulation of sediment residue may lead to poor pumping performance of submersible pumps.

[0004] This invention provides an automatic control system for a submersible pump used to drain water from a pool, comprising:

[0005] Pipes are installed inside the water tank, and a submersible pump is installed inside the tank.

[0006] A differential pressure transmitter, wherein the high-pressure port and the low-pressure port of the differential pressure transmitter are both located inside the pipeline and at both ends of the submersible pump, respectively, and are suitable for detecting the pressure difference between the inlet and outlet sides of the submersible pump;

[0007] A switching valve, wherein the first end of the switching valve is connected to one end of the pipeline near the outlet side of the submersible pump, the second end of the switching valve is connected to the outside of the water tank, and the third end of the switching valve is connected to the inside of the water tank;

[0008] A liquid level sensor is installed inside the water tank and is suitable for detecting the water level in the water tank;

[0009] The controller is connected to the differential pressure transmitter, switching valve, submersible pump and liquid level sensor respectively, and the controller is set with a preset differential pressure range.

[0010] During operation, the controller controls the submersible pump to start. When the differential pressure detected by the differential pressure transmitter is within the preset differential pressure range, the controller controls the first end of the switching valve to connect with the second end of the switching valve. When the differential pressure detected by the differential pressure transmitter exceeds the preset differential pressure range, the controller controls the first end of the switching valve to connect with the third end of the switching valve.

[0011] In this application, when the differential pressure detected by the differential pressure transmitter is within the preset differential pressure range, it indicates that the differential pressure between the two ends of the submersible pump is within a reasonable range, the submersible pump is not blocked, and water can be continuously pumped from the pool. When the differential pressure detected by the differential pressure transmitter exceeds the preset differential pressure range, it indicates that the differential pressure between the two ends of the submersible pump exceeds a reasonable range, the submersible pump is blocked. By connecting the first end of the switching valve to the third end of the switching valve, the water pumped by the submersible pump can be remixed with the water in the pool. This can mix the sediment residue in the pool with the water in the pool, prevent the sediment residue from accumulating, thereby preventing blockage of the submersible pump, reducing the differential pressure between the two ends of the submersible pump, and improving the pumping effect of the submersible pump on the remaining water at the bottom of the pool.

[0012] In one alternative embodiment, one end of the pipe near the submersible pump's inlet is located at the bottom of the pool. This helps the submersible pump extract as much water as possible from the pool, increasing the pumping efficiency.

[0013] In one optional embodiment, the high-pressure port of the differential pressure transmitter is located on the outlet side of the submersible pump, and the low-pressure port of the differential pressure transmitter is located on the inlet side of the submersible pump. This ensures that the differential pressure transmitter generates accurate differential pressure results and prevents reverse or erroneous results.

[0014] In one optional embodiment, a filter screen is installed inside the pipe, located on the inlet side of the submersible pump. The filter screen can filter the water entering the inlet side of the submersible pump.

[0015] In one alternative embodiment, the filter is located between the low-pressure port of the differential pressure transmitter and the inlet side of the submersible pump.

[0016] In one optional embodiment, a cutter is installed inside the pipe, located on the side of the filter screen away from the submersible pump. The cutter is connected to a controller, which controls the submersible pump and the cutter to operate synchronously. The cutter can pre-break up foreign objects entering the water inlet side of the submersible pump, ensuring the smooth flow of the entire pipe.

[0017] In one alternative implementation, the low-pressure port of the differential pressure transmitter is located between the cutter and the filter.

[0018] In one optional implementation, the controller is equipped with a warning water level. When the water level in the pool is lower than the warning water level, the controller controls the differential pressure transmitter to start working.

[0019] When the water level in the pool reaches the warning level, it indicates that the water level in the pool has dropped, and it is necessary to start detecting the pressure difference across the submersible pump using a differential pressure transmitter.

[0020] In one optional embodiment, the controller is further provided with a safe water level. When the water level in the pool is lower than the safe water level, the controller controls the submersible pump to stop working.

[0021] The safe water level is lower than the warning water level.

[0022] The safe water level can be set at the bottom of the pool. When the water level in the pool is lower than the safe water level, the submersible pump may no longer be able to pump water from the pool. At this time, the submersible pump can be stopped to prevent it from running dry and overheating, thus protecting the submersible pump.

[0023] In one optional implementation, the controller is further provided with a differential pressure warning value. When the differential pressure detected by the differential pressure transmitter is greater than the differential pressure warning value, the controller controls the submersible pump to stop working.

[0024] When the differential pressure detected by the differential pressure transmitter is greater than the differential pressure warning value, it indicates that the pressure difference across the submersible pump is too large, which may have caused a serious blockage problem, and the submersible pump needs to be stopped immediately. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Pipeline; 2. Submersible pump; 3. Differential pressure transmitter; 4. Switching valve; 5. Filter screen; 6. Cutter. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The following is combined with Figure 1 The following describes embodiments of the present invention.

[0031] According to an embodiment of the present invention, an automatic control system for a submersible pump is provided for draining a water tank, comprising:

[0032] Pipe 1 is installed inside the water tank, and a submersible pump 2 is installed inside it; wherein, pipe 1 needs to be inside the water tank so that the submersible pump 2 can draw water from the water tank.

[0033] Differential pressure transmitter 3, the high pressure port and the low pressure port of the differential pressure transmitter 3 are both set inside the pipeline 1 and are respectively located at both ends of the submersible pump 2, and are suitable for detecting the pressure difference between the inlet side and the outlet side of the submersible pump 2;

[0034] The switching valve 4 has a first end connected to the end of the pipe 1 near the outlet side of the submersible pump 2, a second end connected to the outside of the water tank, and a third end connected to the inside of the water tank.

[0035] A liquid level sensor is installed inside the water tank and is suitable for detecting the water level in the water tank;

[0036] The controller is connected to the differential pressure transmitter 3, the switching valve 4, the submersible pump 2, and the liquid level sensor. The controller is equipped with a preset differential pressure range. The differential pressure transmitter 3 can transmit the detected differential pressure signal between the inlet and outlet sides of the submersible pump 2 to the controller, and the liquid level sensor can transmit the detected water level signal in the pool to the controller.

[0037] During operation, the controller activates the submersible pump 2. When the differential pressure detected by the differential pressure transmitter 3 is within the preset differential pressure range, the controller connects the first end of the switching valve 4 to the second end of the switching valve 4. When the differential pressure detected by the differential pressure transmitter 3 exceeds the preset differential pressure range, the controller connects the first end of the switching valve 4 to the third end of the switching valve 4. The preset differential pressure range is the pressure difference between the two ends of the submersible pump 2 when blockage begins but is not severe. The controller compares the differential pressure detected by the differential pressure transmitter 3 with the preset differential pressure range to determine whether the differential pressure detected by the differential pressure transmitter 3 is within the preset differential pressure range.

[0038] In this application, when the differential pressure detected by the differential pressure transmitter 3 is within the preset differential pressure range, it indicates that the differential pressure across the submersible pump 2 is within a reasonable range, the submersible pump 2 is not blocked, and water can be continuously pumped from the pool through the submersible pump 2. When the differential pressure detected by the differential pressure transmitter 3 exceeds the preset differential pressure range, it indicates that the differential pressure across the submersible pump 2 exceeds a reasonable range, the submersible pump 2 is blocked to some extent. This can be addressed by connecting the first end of the switching valve 4 to the third end of the switching valve 4, allowing the water pumped by the submersible pump 2 to be remixed with the water in the pool. This mixes the sediment residue in the pool with the water in the pool, preventing the sediment residue from accumulating and thus preventing blockage of the submersible pump 2. This reduces the differential pressure across the submersible pump 2 and improves the pumping effect of the submersible pump 2 on the remaining water at the bottom of the pool.

[0039] In one alternative embodiment, one end of the pipe 1 near the water inlet of the submersible pump 2 is located at the bottom of the pool. This helps the submersible pump 2 to extract as much water as possible from the pool, increasing the pumping efficiency.

[0040] In one optional embodiment, the high-pressure port of the differential pressure transmitter 3 is located on the outlet side of the submersible pump 2, and the low-pressure port of the differential pressure transmitter 3 is located on the inlet side of the submersible pump 2. This ensures that the differential pressure transmitter 3 generates accurate differential pressure results and prevents reverse or erroneous results.

[0041] In one optional embodiment, a filter screen 5 is installed inside the pipe 1, and the filter screen 5 is located on the water inlet side of the submersible pump 2. The filter screen 5 can filter the water entering the water inlet side of the submersible pump 2.

[0042] In one alternative embodiment, the filter 5 is located between the low-pressure port of the differential pressure transmitter 3 and the water inlet side of the submersible pump 2.

[0043] In one optional embodiment, a cutter 6 is installed inside the pipe 1. The cutter 6 is located on the side of the filter screen 5 away from the submersible pump 2. The cutter 6 is connected to the controller, which controls the submersible pump 2 and the cutter 6 to operate synchronously. The cutter 6 can pre-break up foreign objects entering the water inlet side of the submersible pump 2, protecting the unobstructed flow of the entire pipe 1.

[0044] In one alternative embodiment, the low-pressure port of the differential pressure transmitter 3 is located between the cutter 6 and the filter 5.

[0045] In one optional implementation, the controller is equipped with a warning water level. When the water level in the pool is lower than the warning water level, the controller activates the differential pressure transmitter 3. The controller compares the water level detected by the level sensor with the warning water level to determine whether the water level in the pool is lower than the warning water level.

[0046] When the water level in the pool reaches the warning level, it indicates that the water level in the pool has dropped, and the differential pressure transmitter 3 needs to start detecting the pressure difference across the submersible pump 2.

[0047] In one optional embodiment, the controller is further provided with a safety water level. When the water level in the pool is lower than the safety water level, the controller controls the submersible pump 2 to stop working. The controller compares the water level in the pool detected by the liquid level sensor with the safety water level to determine whether the water level in the pool is lower than the safety water level.

[0048] The safe water level is lower than the warning water level.

[0049] The safe water level can be set at the bottom of the pool. When the water level in the pool is lower than the safe water level, the submersible pump 2 may no longer be able to pump water from the pool. At this time, the submersible pump 2 can be stopped to prevent it from running dry and overheating, thus protecting the submersible pump 2.

[0050] In one optional implementation, the controller is further equipped with a differential pressure warning value. When the differential pressure detected by the differential pressure transmitter 3 exceeds the differential pressure warning value, the controller controls the submersible pump 2 to stop working. The value of the differential pressure warning value must be greater than a preset differential pressure range.

[0051] When the differential pressure detected by the differential pressure transmitter 3 is greater than the differential pressure warning value, it indicates that the differential pressure across the submersible pump 2 is too large, which may have caused a serious blockage problem. It is necessary to stop the operation of the submersible pump 2 in time, issue an alarm, and clean it manually.

[0052] The controller can also set an overflow level, which corresponds to the top of the pool. When the water level in the pool is higher than the overflow level, it indicates that the pool is full, and the controller can control the submersible pump 2 to start working.

[0053] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An automatic control system for a submersible pump, used for draining water from a pool, characterized in that, include: Pipe (1) is installed in the water tank and a submersible pump (2) is installed inside it. One end of the pipe (1) near the water inlet of the submersible pump (2) is located at the bottom of the water tank. Differential pressure transmitter (3), the high pressure port and the low pressure port of the differential pressure transmitter (3) are both located inside the pipeline (1) and at both ends of the submersible pump (2), respectively, suitable for detecting the pressure difference between the inlet side and the outlet side of the submersible pump (2), the high pressure port of the differential pressure transmitter (3) is located on the outlet side of the submersible pump (2), and the low pressure port of the differential pressure transmitter (3) is located on the inlet side of the submersible pump (2); The switching valve (4) has its first end connected to the end of the pipe (1) near the outlet side of the submersible pump (2), its second end connected to the outside of the water tank, and its third end connected to the inside of the water tank. A liquid level sensor is installed inside the water tank and is suitable for detecting the water level in the water tank; The differential pressure transmitter (3), switching valve (4), submersible pump (2) and liquid level sensor are respectively connected to the controller, and the controller is provided with a differential pressure preset range; A filter screen (5) is installed inside the pipe (1). The filter screen (5) is located on the water inlet side of the submersible pump (2). The filter screen (5) is located between the low-pressure port of the differential pressure transmitter (3) and the water inlet side of the submersible pump (2). During operation, the controller controls the submersible pump (2) to start. When the differential pressure detected by the differential pressure transmitter (3) is within the preset differential pressure range, the controller controls the first end of the switching valve (4) to connect with the second end of the switching valve (4). When the differential pressure detected by the differential pressure transmitter (3) exceeds the preset differential pressure range, the controller controls the first end of the switching valve (4) to connect with the third end of the switching valve (4).

2. The automatic control system for submersible pumps according to claim 1, characterized in that, A cutter (6) is installed inside the pipe (1). The cutter (6) is located on the filter screen (5) on the side away from the submersible pump (2). The cutter (6) is connected to the controller, and the controller controls the submersible pump (2) and the cutter (6) to operate synchronously.

3. The automatic control system for submersible pumps according to claim 2, characterized in that, The low-pressure port of the differential pressure transmitter (3) is located between the cutter (6) and the filter (5).

4. The automatic control system for submersible pumps according to claim 1, characterized in that, The controller is equipped with a warning water level. When the water level in the pool is lower than the warning water level, the controller controls the differential pressure transmitter (3) to start working.

5. The automatic control system for submersible pumps according to claim 4, characterized in that, The controller is also equipped with a safety water level. When the water level in the pool is lower than the safety water level, the controller controls the submersible pump (2) to stop working. The safe water level is lower than the warning water level.

6. The automatic control system for submersible pumps according to claim 1, characterized in that, The controller is also equipped with a differential pressure warning value. When the differential pressure detected by the differential pressure transmitter (3) is greater than the differential pressure warning value, the controller controls the submersible pump (2) to stop working.

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