Submersible pump control circuit and device

Abstract

The present invention provides a submersible pump control circuit and device, including: a submersible pump, a protection circuit, an automatic control circuit, a switching circuit and a power supply; the power input end of the submersible pump is electrically connected to the output end of the protection circuit, the input end of the protection circuit is electrically connected to the power supply, the protection circuit is electrically connected to the switching circuit, and the automatic control circuit is electrically connected to the switching circuit; wherein, the automatic control circuit is used to automatically control the start and stop of the submersible pump according to the water level signal and pipeline pressure signal of the submersible pump. Based on the present invention, the start and stop of the submersible pump can be controlled by opening and closing the submersible pump pipeline, and by setting a water level switch, dry pumping of the submersible pump can be avoided, thereby damaging the submersible pump.

Description

Technical Field

[0001] The present invention relates to the field of automatic control, and in particular to a submersible pump control circuit and device. Background Art

[0002] In various civil engineering infrastructures, dewatering projects are often required, and dewatering projects require submersible pumps to pump water to the outside. When the submersible pump is working, the submersible pump is submerged in water, and the water level of the submersible pump cannot be seen. If the water level is too low, the submersible pump will be damaged if it continues to work. The safety is poor, and manual inspections cannot guarantee the normal operation of the submersible pump. Valves are often installed on the pipelines of the submersible pump, and the opening and closing of the valves cannot be linked to the start and stop of the submersible pump. Summary of the Invention

[0003] In view of this, the present invention discloses a submersible pump control circuit and device, which can control the start and stop of the submersible pump by opening and closing the submersible pump pipeline, and avoid dry pumping of the submersible pump and damage to the submersible pump by setting a water level switch.

[0004] A first embodiment of the present invention provides a submersible pump control circuit, comprising: a submersible pump, a protection circuit, an automatic control circuit, a switching circuit, and a power supply;

[0005] The power input end of the submersible pump is electrically connected to the output end of the protection circuit, the input end of the protection circuit is electrically connected to the power supply, the protection circuit is electrically connected to the switching circuit, and the automatic control circuit is electrically connected to the switching circuit; wherein, the automatic control circuit is used to automatically control the start and stop of the submersible pump according to the water level signal and pipeline pressure signal of the submersible pump.

[0006] Preferably, it also includes: a manual control circuit;

[0007] The input end of the manual control loop is electrically connected to the output end of the switching loop.

[0008] Preferably, the protection circuit includes: a thermal relay, a contactor and an air switch;

[0009] The input end of the air switch is electrically connected to the power supply, the output end of the air switch is electrically connected to the contactor, the output end of the contactor is electrically connected to the input end of the thermal relay, and the thermal relay is electrically connected to the power input end of the submersible pump.

[0010] Preferably, the automatic control circuit includes: a controller, a water level detector, a pressure switch, a first relay and a second relay;

[0011] The output end of the water level detector is electrically connected to the analog interface of the controller, the output end of the pressure switch is connected to the input end of the controller, the coil of the first relay is electrically connected to the output end of the controller, and the coil of the second relay is electrically connected to the output end of the controller.

[0012] Preferably, the water level detector is a float switch, wherein the model of the float switch is CX-25.

[0013] Preferably, the controller is a PLC controller.

[0014] Preferably, the switching circuit includes: a switching switch and a fuse, wherein the switching switch includes a first path and a second path;

[0015] The first end of the fuse is electrically connected to the protection circuit, the second end of the fuse is electrically connected to the first end of the contact of the first relay, the first ends of the first path and the second path are electrically connected to the second end of the contact of the first relay, the second end of the first path is electrically connected to the first end of the contact of the second relay, the second end of the contact of the second relay is electrically connected to the coil of the contactor, and the second end of the second path is electrically connected to the manual control circuit.

[0016] Preferably, the manual control circuit includes: a start button and a stop button;

[0017] The first end of the start button is electrically connected to the second end of the second passage, the second end of the start button is electrically connected to the first end of the stop button, and the second end of the stop button is electrically connected to the coil of the contactor.

[0018] The second embodiment of the present invention provides a submersible pump control device, including a water outlet pipe, a valve and a submersible pump control circuit as described above, wherein the first end of the water outlet pipe is connected to the water outlet of the submersible pump, and the second end of the water outlet pipe is provided with the valve for opening and closing the water outlet pipe.

[0019] Preferably, it further comprises a pressure tank; the pressure tank is arranged on the water outlet pipe, wherein the pressure tank is arranged between the water outlet and the valve.

[0020] Based on a submersible pump control circuit and device provided by the present invention, through a manual circuit and an automatic control circuit, the manual circuit can intuitively disconnect the circuit, and the automatic control circuit is provided with a pressure switch. When the water pressure is high, the controller acts as an output disconnect switch, that is, disconnecting the submersible pump power circuit. When the water level of the submersible pump is low, the float switch disconnects the submersible pump power circuit to avoid dry pumping of the submersible pump and damage to the submersible pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a schematic diagram of a submersible pump control circuit module provided by the first embodiment of the present invention;

[0022] Figure 2 1 is a schematic diagram of a submersible pump control circuit provided by a first embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a submersible pump controller provided by a first embodiment of the present invention;

[0024] Figure 4 Schematic diagram of a submersible pump control device provided in the second embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention for which protection is sought, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] In view of this, the present invention discloses a submersible pump control circuit and device, which can control the start and stop of the submersible pump by opening and closing the submersible pump pipeline, and avoid dry pumping of the submersible pump and damage to the submersible pump by setting a water level switch.

[0031] See also Figure 1 The first embodiment of the present invention provides a submersible pump control circuit, comprising: a submersible pump M, a protection circuit 2, an automatic control circuit 3, a switching circuit 4 and a power supply 1;

[0032] The power input end of the submersible pump M is electrically connected to the output end of the protection circuit 2, the input end of the protection circuit 2 is electrically connected to the power supply 1, the protection circuit 2 is electrically connected to the switching circuit 4, and the automatic control circuit 3 is electrically connected to the switching circuit 4; wherein, the automatic control circuit 3 is used to automatically control the start and stop of the submersible pump according to the water level signal and pipeline pressure signal of the submersible pump M.

[0033] It should be noted that the protection circuit 2 is used to isolate the circuit from the power supply when a short circuit overcurrent occurs in the line or when the power supply voltage is too low for a long time. The power supply 1 is used to power the submersible pump and the control circuit, wherein the power supply 1 is single-phase electricity. The automatic control circuit is used to automatically control the start and stop of the submersible pump according to the water level signal and pipeline pressure signal of the submersible pump M to avoid dry pumping or damage of the submersible pump.

[0034] In this embodiment, it also includes: a manual control circuit 5;

[0035] The input end of the manual control loop is electrically connected to the output end of the switching loop.

[0036] It should be noted that the switching circuit 4 is used to switch the submersible pump M to manual control or automatic control.

[0037] In this embodiment, the protection circuit 2 includes: a thermal relay KH, a contactor KM and an air switch Q1;

[0038] The input end of the air switch Q1 is electrically connected to the power supply 1, the output end of the air switch Q1 is electrically connected to the contactor KM, the output end of the contactor KM is electrically connected to the input end of the thermal relay KH, and the thermal relay KH is electrically connected to the power input end of the submersible pump M.

[0039] It should be noted that the air switch Q1 is used to detect overcurrent caused by short circuit in the circuit and disconnect the circuit in time to avoid damage to the submersible pump and the circuit. The thermal relay KH is used to operate the submersible pump M for a long time under low pressure and generate serious heat. When the temperature exceeds a certain level, the thermal relay KH will operate to cut off the circuit and the submersible pump M will stop running. When the temperature drops, the thermal relay KH will close again and the submersible pump M will start running again.

[0040] See also Figure 3 In this embodiment, the automatic control circuit 3 includes: a controller 8, a water level detector 6, a pressure switch 7, a first relay SY and a second relay Sq;

[0041] The output end of the water level detector 6 is electrically connected to the analog interface of the controller 8, the output end of the pressure switch 7 is electrically connected to the input end of the controller 8, the coil of the first relay SY is electrically connected to the output end of the controller 8, and the coil of the second relay Sq is electrically connected to the output end of the controller 8.

[0042] It should be noted that the pressure switch 7 detects the pipeline pressure value and compares it with the preset value set in the control 8. When the pressure is greater than the preset value, the controller 8 outputs an electrical signal to the coil of the first relay SY. After the coil of the first relay SY, the contacts of the first relay are actuated to disconnect the circuit, causing the submersible pump M to exit operation. Of course, in other embodiments, other pressure switches can also be used, which can be directly connected in series in the circuit without being judged by the control 8, and the connection between the submersible pump M and the power supply can be directly disconnected.

[0043] In addition, the water level detector 6 is used to detect whether the water level is lower than the preset water level. When it is determined that the water level is lower than the preset water level, the water level detector 6 outputs an electrical signal to the control 8. The controller 8 outputs a corresponding electrical signal to the second relay Sq based on the electrical signal. The contacts of the second relay are actuated to disconnect the circuit, causing the submersible pump M to exit operation, thereby avoiding the situation where the submersible pump M runs dry, thereby damaging the submersible pump M.

[0044] In this embodiment, the water level detector is a float switch, wherein the model of the float switch is CX-25, and the float switch is a mercury float switch. When the water level is lower than the preset horizontal line, the float circuit is turned on and a signal is output to the controller 8, so that the contacts of the second relay are actuated and the circuit is disconnected. Of course, in other embodiments, a water level sensor can also be electrically connected to the analog interface of the controller 8, and the water level value preset in the controller is judged. When the water level is lower than the preset water level value, the circuit is disconnected, so that the submersible pump M stops running.

[0045] In this embodiment, the controller is a PLC controller, wherein the PLC controller can be Siemens or Mitsubishi, and of course, it can also be other controllers with judgment capabilities. These schemes can be set according to actual conditions and are not specifically limited here, but these schemes are all within the scope of protection of the present invention.

[0046] In this embodiment, the switching circuit 4 includes: a switching switch and a fuse FU, wherein the switching switch includes a first path S1 and a second path S2;

[0047] The first end of the fuse FU is electrically connected to the protection circuit 4, the second end of the fuse FU is electrically connected to the first end of the contact of the first relay SY, the first end of the first path S1 and the second end of the second path S2 are electrically connected to the second end of the contact SY of the first relay, the second end of the first path S1 is electrically connected to the first end of the contact of the second relay Sq, the second end of the contact of the second relay Sq is electrically connected to the coil of the contactor KM, and the second end of the second path S2 is electrically connected to the manual control circuit 5.

[0048] It should be noted that the fuse FU is used to disconnect the circuit when overcurrent occurs in the circuit to play a protective role. The first path S1 of the switching circuit is a manual control circuit, and the second path S2 of the switching circuit is an automatic control circuit. Both the manual control circuit and the automatic control circuit must be controlled by the float switch. When the water level is too low, the contacts of the second relay are disconnected to prevent the coil of the contactor KM from being energized and turning on the submersible pump circuit.

[0049] In this embodiment, the manual control circuit includes: a start button ST, a stop button SP;

[0050] A first end of the start button ST is electrically connected to a second end of the second path, a second end of the start button ST is electrically connected to a first end of the stop button SP, and a second end of the stop button SP is electrically connected to the coil of the contactor KM.

[0051] It should be noted that the stop button SP is in a closed state when connected to the loop, which is convenient for troubleshooting. In other embodiments, a host computer, such as a touch screen, can also be set up. The touch screen is electrically connected to the controller and can be used as a switch instead of a button. The corresponding output is made in the loop through a relay. Of course, the pressure signal and the water level signal can also be displayed on the touch screen to facilitate the staff to check the current water pressure and water level. These schemes can be set according to actual conditions and are not specifically limited here, but these schemes are all within the scope of protection of the present invention.

[0052] See also Figure 4 The second embodiment of the present invention provides a submersible pump control device, including a water outlet pipe 20, a valve 18 and a submersible pump control circuit as described above, wherein the first end of the water outlet pipe 19 is connected to the water outlet of the submersible pump M, and the second end of the water outlet pipe is provided with the valve 18 for opening and closing the water outlet pipe 20.

[0053] It should be noted that the submersible pump M includes: a filter 16, a pump head 9, an impeller 10, a machine base 11, a mechanical seal 12, a stator 13, a rotor 14, an upper cover 15, and a float switch 22 fixed on the upper cover 15 for detecting the water level. The submersible pump is connected to the controller 8 via a waterproof cable 21. The pressure switch SY is arranged on the pipeline, and a water outlet 19 is provided at the front end of the outlet pipe 20. After the submersible pump M is energized, the rotor 14 rotates to drive the impeller 10 to rotate. After the fluid enters the impeller 10 and accelerates, it flows into the inlet and out of the water outlet 19. The impeller is fixed to the rotating shaft by a nut, and the filter 16 is provided at the water inlet to prevent lumps from damaging the submersible pump M.

[0054] In this embodiment, a pressure tank 17 is further included; the pressure tank 17 is disposed on the water outlet pipe 20 , wherein the pressure tank 20 is disposed between the water outlet 19 and the valve 18 .

[0055] It should be noted that the pressure tank 17 plays a buffering role when the valve 18 is closed, thereby preventing the pressure switch from being damaged by instantaneous water pressure.

[0056] Based on a submersible pump control circuit and device provided by the present invention, through a manual circuit and an automatic control circuit, the manual circuit can intuitively disconnect the circuit, and the automatic control circuit is provided with a pressure switch. When the water pressure is high, the controller acts as an output disconnect switch, that is, disconnecting the submersible pump power circuit. When the water level of the submersible pump is low, the float switch disconnects the submersible pump power circuit to avoid dry pumping of the submersible pump and damage to the submersible pump.

[0057] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

Claims

1. A submersible pump control circuit, characterized in that: include: Submersible pump, protection circuit, automatic control circuit, switching circuit and power supply; The power input end of the submersible pump is electrically connected to the output end of the protection circuit, the input end of the protection circuit is electrically connected to the power supply, the protection circuit is electrically connected to the switching circuit, and the automatic control circuit is electrically connected to the switching circuit; wherein the automatic control circuit is used to automatically control the start and stop of the submersible pump according to the water level signal and pipeline pressure signal of the submersible pump; The automatic control circuit includes: a controller, a water level detector, a pressure switch, a first relay and a second relay; The output end of the water level detector is electrically connected to the analog interface of the controller, the output end of the pressure switch is connected to the input end of the controller, the coil of the first relay is electrically connected to the output end of the controller, and the coil of the second relay is electrically connected to the output end of the controller; The controller is a PLC controller; The switching circuit includes: a switching switch and a fuse, wherein the switching switch includes a first path and a second path; The first end of the fuse is electrically connected to the protection circuit, the second end of the fuse is electrically connected to the first end of the contact of the first relay, the first ends of the first path and the second path are electrically connected to the second end of the contact of the first relay, the second end of the first path is electrically connected to the first end of the contact of the second relay, the second end of the contact of the second relay is electrically connected to the coil of the contactor, and the second end of the second path is electrically connected to the manual control circuit.

2. A submersible pump control circuit according to claim 1, characterized in that: Also includes: Manual control loop; The input end of the manual control loop is electrically connected to the output end of the switching loop.

3. A submersible pump control circuit according to claim 2, characterized in that: The protection circuit includes: a thermal relay, a contactor and an air switch; The input end of the air switch is electrically connected to the power supply, the output end of the air switch is electrically connected to the contactor, the output end of the contactor is electrically connected to the input end of the thermal relay, and the thermal relay is electrically connected to the power input end of the submersible pump.

4. A submersible pump control circuit according to claim 3, characterized in that: The water level detector is a float switch, wherein the model of the float switch is CX-25.

5. A submersible pump control circuit according to claim 4, characterized in that: The manual control circuit includes: a start button and a stop button; The first end of the start button is electrically connected to the second end of the second passage, the second end of the start button is electrically connected to the first end of the stop button, and the second end of the stop button is electrically connected to the coil of the contactor.

6. A submersible pump control device, characterized in that: It comprises a water outlet pipe, a valve and a submersible pump control circuit as described in any one of claims 1 to 5, wherein the first end of the water outlet pipe is connected to the water outlet of the submersible pump, and the second end of the water outlet pipe is provided with the valve for opening and closing the water outlet pipe.

7. A submersible pump control device according to claim 6, characterized in that: It also includes a pressure tank; the pressure tank is arranged on the water outlet pipe, wherein the pressure tank is arranged between the water outlet and the valve.

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