Direct-current water pump with impurity filtering function

Abstract

The invention relates to the technical field of water pumps, in particular to a direct-current water pump with an impurity filtering function, which comprises a first shell and a second shell which are assembled and connected, the first shell and the second shell are communicated through an overflowing channel, a detachable filter screen is arranged in the first shell, and a water inlet is formed in the first shell and located on the first side of the filter screen. The overflowing channel is located on the second side of the filter screen, a motor, pump blades in transmission connection with a power output shaft of the motor and a control module electrically connected with the motor are arranged in the second shell, and the control module can control the motor to rotate forwards or reversely or stop rotating. A complex filtering structure does not need to be additionally arranged on an upstream pipeline of the water pump, pipeline layout is simplified, occupied installation space is reduced, the control module is used for controlling the motor and the pump blades to achieve the automatic reverse rotation function, entanglements on the filter screen can be automatically cleaned, and the problem that the filter screen needs to be frequently and manually cleaned in the prior art is effectively solved; and the maintenance cost is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of water pump technology, and in particular to a DC water pump with impurity filtration function. Background Technology

[0002] With the increasing intelligence of home appliances, water pumps are being used more and more widely in various appliances, such as washing machines and dishwashers, which usually require water pumps for automatic sewage discharge.

[0003] In actual use, the discharged wastewater often contains a large amount of debris, hair, paper scraps, or thread ends. After these impurities enter the water pump with the water flow, they can easily become entangled on the impeller or shaft, causing the water pump to become blocked.

[0004] To address the aforementioned problem of impurity clogging, existing technologies typically employ the following solutions, but these still have significant limitations:

[0005] The first method involves installing a filter screen in the connecting pipe upstream of the water pump. This design not only occupies a large amount of internal installation space but also makes the upstream pipe layout extremely complex, increasing manufacturing and assembly costs.

[0006] The second method involves installing a filter directly at the water pump's inlet. While this prevents large particles from entering the pump chamber, with repeated use, impurities quickly accumulate on the filter surface, reducing the flow area and significantly decreasing drainage efficiency. Therefore, users must frequently perform manual disassembly and cleaning, making maintenance cumbersome and resulting in a poor user experience. Summary of the Invention

[0007] The purpose of this invention is to solve one of the problems pointed out in the background art, and to propose a DC water pump with impurity filtration function.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A DC water pump with impurity filtration function includes a first housing and a second housing assembled together, which are connected by a flow channel. The first housing has a removable filter screen inside, and the first housing has a water inlet on the first side of the filter screen. The flow channel is located on the second side of the filter screen. The second housing has a motor, a pump blade that is driven and connected to the motor's power output shaft, and a control module that is electrically connected to the motor. The control module can control the motor to rotate forward, reverse, or stop.

[0010] This invention proposes a DC water pump with impurity filtration function. The advantages are as follows: This solution integrates a detachable filter screen directly within the first housing, achieving integrated filtration functionality. This eliminates the need for a complex additional filter structure in the upstream pipeline, simplifying the pipeline layout and reducing installation space requirements. Addressing the impurity clogging problem mentioned in the background technology, this solution utilizes a control module to control the motor and pump impeller to achieve automatic reverse rotation. This allows the pump to autonomously clean entangled materials from the filter screen, effectively solving the problem of frequent manual filter cleaning required in existing technologies and significantly reducing maintenance costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0012] Figure 2 This is a schematic diagram of the half-section three-dimensional structure of the present invention;

[0013] Figure 3 This is a schematic diagram of the half-section main view structure of the present invention;

[0014] Figure 4 This is a schematic diagram of the three-dimensional structure of the first outer shell of the present invention;

[0015] Figure 5 This is a schematic diagram of the main cross-sectional structure of the first outer shell of the present invention;

[0016] Figure 6 This is a schematic diagram of the three-dimensional structure of the filter screen of the present invention. Figure 1 ;

[0017] Figure 7 This is a schematic diagram of the main cross-sectional structure of the filter screen of the present invention;

[0018] Figure 8 This is a schematic diagram of the three-dimensional structure of the filter screen of the present invention. Figure 2 ;

[0019] Figure 9 This is a schematic diagram of the three-dimensional structure of the detachable cover of the present invention;

[0020] Figure 10 This is a schematic diagram of the position structure of the sensing electrode of the present invention;

[0021] Figure 11 This is a schematic diagram of the three-dimensional structure of the second outer shell of the present invention;

[0022] Figure 12 This is a schematic diagram of the distribution structure of the sensing electrodes of the present invention;

[0023] Figure 13 This is a cross-sectional perspective view of the second outer shell of the present invention.

[0024] Figure 14 This is a schematic diagram of the power supply circuit of the present invention;

[0025] Figure 15 This is a schematic diagram of the rotation detection unit circuit of the present invention;

[0026] Figure 16 This is a schematic diagram of the current and temperature detection circuit of the present invention;

[0027] Figure 17 This is a schematic diagram of the waterless detection unit circuit of the present invention;

[0028] Figure 18 This is a schematic diagram of the motor drive module circuit of the present invention;

[0029] Figure 19 This is a schematic diagram of the MCU circuit of the power control board of the present invention.

[0030] In the diagram: 1. First outer shell; 2. Second outer shell; 3. Inlet; 4. Outlet; 5. Removable cover; 6. Filter screen; 7. Internal thread; 8. External thread; 9. Handheld part; 10. Buckle; 11. Slot; 12. Flow channel; 13. Induction electrode; 14. Pump blade; 15. Rotor assembly; 16. Stator assembly; 17. Control board; 18. Water cavity; 19. Electrical cavity; 20. Sealing gasket; 21. First positioning shaft; 22. Main body; 23. Rotating shaft; 24. Magnetic core; 25. Second positioning shaft; 26. Disc body; 27. Sealing groove; 28. Protrusion; 29. ​​Arc-shaped filter part; 30. Column; 31. Plate filter part; 32. Disc filter part; 33. Filter hole; 34. Induction plate part; 35. Strip part; 36. Mounting groove; 37. Rotor cover; 38. Positioning groove; 39. Through hole; 40. Receiving cavity; 41. Stepped part; 42. Opening end; 43. Limiting rib; 44. Rotor slot cavity. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Reference Figures 1-19 A DC water pump with impurity filtration function includes a first housing 1 and a second housing 2 assembled and connected, the first housing 1 and the second housing 2 being connected by a flow passage 12. The first housing 1 is provided with a detachable filter screen 6. The first housing 1 is provided with a water inlet 3 on the first side of the filter screen 6, and the flow passage 12 is located on the second side of the filter screen 6. The second housing 2 is provided with a motor, a pump blade 14 that is driven and connected to the power output shaft of the motor, and a control module that is electrically connected to the motor. The control module can control the motor to rotate forward, reverse, or stop.

[0033] Under the rotation of pump blade 14, sewage enters the first housing 1 through inlet 3 and flows towards filter screen 6 under pressure. Since filter screen 6 is located between inlet 3 and flow channel 12, impurities such as hair and paper scraps in the sewage are intercepted on the first side of filter screen 6, and the filtered liquid passes through filter screen 6 into flow channel 12. The liquid then enters the second housing 2 through flow channel 12. During drainage, if the control module detects a blockage, the control module drives the motor to rotate pump blade 14 in the opposite direction, using the reverse water flow to flush filter screen 6 to untangle impurities and automatically clear the filter holes. This structure achieves automatic cleaning of the filter screen, reducing the frequency of manual cleaning. After long-term use, filter screen 6 can be manually disassembled for thorough cleaning.

[0034] This solution integrates a removable filter screen 6 directly within the first housing 1, achieving integrated filtration for the water pump. This eliminates the need for a complex additional filtration structure in the upstream pipeline, simplifying the pipeline layout and reducing installation space requirements. Addressing the clogging issue mentioned in the background section, this solution utilizes a control module to control the motor and pump impeller 14, enabling automatic reverse rotation. This allows the pump to autonomously clean any entanglements on the filter screen 6, effectively resolving the need for frequent manual cleaning in existing technologies and significantly reducing maintenance costs.

[0035] refer to Figures 2-5 The first outer shell 1 has a receiving cavity 40, which is a cylindrical chamber. The first outer shell 1 has an open end 42 at one end of the receiving cavity 40 and a flow passage 12 at the other end of the receiving cavity 40. The water inlet 3 is arranged radially along the receiving cavity 40. The filter screen 6 is limited and assembled in the receiving cavity 40 by the open end 42, and the open end 42 is equipped with a detachable cover 5.

[0036] The filter screen 6 is assembled through the open end 42, and with the design of the removable cover 5, users can quickly disassemble and install it when deep cleaning or component replacement is required. When the control module detects a stall and drives the motor to reverse, the cylindrical chamber 40 is conducive to the formation of a stable reverse flushing flow field for the liquid. In this cylindrical space, the liquid pressure generated by the reverse rotation can act more evenly on the surface of the filter screen 6, pushing accumulated hair, paper scraps and other impurities away from the filter screen 6, thereby achieving a highly efficient self-cleaning effect.

[0037] refer to Figure 5 , Figure 6The filter screen 6 includes a disc portion 26. Along the axial direction of the receiving cavity 40, one side of the disc portion 26 is provided with an arc-shaped filter portion 29 and a plate filter portion 31 located at the edge of the arc-shaped filter portion 29. The ends of the arc-shaped filter portion 29 and the plate filter portion 31 away from the disc portion 26 are provided with a disc filter portion 32 arranged radially along the receiving cavity 40. The inner peripheral wall of the first outer shell 1 is provided with a limiting rib 43 along its axial direction. The plate filter portion 31 is radially limited and assembled with the limiting rib 43. The arc-shaped filter portion 29, the plate filter portion 31, and the disc filter portion 32 are provided with at least one type of filter hole 33. The side of the arc-shaped filter portion 29, the plate filter portion 31, and the disc filter portion 32 near the water inlet 3 is the first side of the filter screen 6.

[0038] Liquid enters the first housing 1 through the inlet 3 and flows to the filter screen 6. The filter screen 6 is radially positioned and assembled with the limiting ribs 43 on the inner peripheral wall of the first housing 1 via its plate filter section 31, thus stably installing the filter screen 6 within the cylindrical receiving cavity 40. The liquid first contacts the arc-shaped filter section 29, the plate filter section 31, and the disc filter section 32 located on the first side of the filter screen 6. Impurities in the wastewater are intercepted on the surface of these filter components, while the purified liquid flows through the filter holes 33 to the flow channel. The design of the arc-shaped filter section 29 allows the liquid to be distributed along the arc surface as it flows through, and in conjunction with the radially arranged disc filter section 32 and the edge plate filter section 31, multi-dimensional filtration guidance is achieved.

[0039] refer to Figure 2 , Figure 3 , Figure 6 The disc body 26 is provided with a sealing groove 27 on the side near the arc surface filter part 29. A sealing gasket 20 is installed in the sealing groove 27. The first outer shell 1 is provided with a stepped part 41 and an internal thread part 7 from the inside to the outside at the opening end 42. The detachable cover 5 is provided with an external thread part 8 that mates with the internal thread part 7. The sealing gasket 20 is partially embedded in the sealing groove 27 and partially sandwiched between the stepped part 41 and the disc body 26. The outer side of the disc body 26 abuts against the detachable cover 5.

[0040] First, insert the filter screen 6 into the receiving cavity 40 along the limiting rib 43, and then tighten the removable cover 5 by threading it, so that the sealing gasket 20 and the disc body 26 are clamped between the removable cover 5 and the stepped part 41 to achieve a sealed assembly.

[0041] In one embodiment, the curved surface filter section 29 and / or the plate filter section 31 are provided with a column 30 on the side near the water inlet 3. By providing multiple columns 30, filamentous impurities, such as hair, can be better blocked.

[0042] refer to Figure 2The outer center of the disc body 26 is provided with a ring-shaped groove 11, and the center of the detachable cover 5 is provided with a buckle part 10. The buckle part 10 is inserted into the groove 11 and can rotate along the axis of the detachable cover 5 within the groove 11.

[0043] This device connects the removable cover 5 to the filter screen disc 26 with a snap-fit ​​mechanism, and the two can rotate freely. By using this method to connect the removable cover 5 to the filter screen, the filter screen can be disassembled and installed by twisting the removable cover 5, which is convenient to use.

[0044] In one embodiment, the removable cover 5 has a handle 9 on the outside, which makes it easy to twist the removable cover 5;

[0045] In one embodiment, the disc portion 26 is provided with a protrusion 28 on the side near the arc surface filter portion 29 and the plate filter portion 31, which increases the contact area between the disc portion 26 and the filter body and improves the strength.

[0046] refer to Figures 1-13 The second outer shell 2 has a water cavity 18 and an electrical cavity 19 separated by partitions. The motor includes a rotor assembly 15 and a stator assembly 16. The control module includes an electronic control board 17 and a detection module. The rotor assembly 15 and the pump blades 14 are located in the water cavity 18, and the stator assembly 16, the electronic control board 17, and the detection module are all located in the electrical cavity 19.

[0047] This device divides the second outer casing 2 into two independent chambers, which can prevent liquid from damaging the electrical components of the stator assembly 16, the control board 17, and the detection module.

[0048] The rotor assembly 15 includes a main body 22, a magnetic core 24 injection-molded around the main body 22, and a rotating shaft 23 injection-molded or assembled and connected to the axis of the main body 22. The pump blade 14 is integrally injection-molded or assembled and connected to the main body 22. The second outer shell 2 has an integrally formed rotor cover 37. The rotor cover 37 has a rotor slot cavity 44 separated from the electrical cavity 19. One end of the rotor slot cavity 44 is connected to the water cavity 18, and the other end is provided with a positioning groove 38. The main body 22 is assembled in the rotor cover 37, and the rotating shaft 23 is assembled in the positioning groove 38.

[0049] Pump impeller 14 is integrally injection molded or assembled with main body 22, thereby forming an integrated rotating structure with rotor assembly 15. Main body 22 is assembled in rotor slot 44, and rotating shaft 23 is inserted and positioned in positioning slot 38, thereby forming a stable rotating support structure for rotor assembly 15 within rotor cover 37. During operation, rotor assembly 15 rotates around rotating shaft 23 under driving action, driving pump impeller 14 connected to main body 22 to rotate synchronously, causing liquid in water cavity 18 to flow under centrifugal force and be transported in a predetermined direction. Rotor cover 37 covers and limits rotor assembly 15, keeping rotor assembly 15 in a stable operating state during rotation, while also achieving spatial isolation between rotor assembly 15 and electrical cavity 19.

[0050] Furthermore, the rotor slot 44 of this device is connected to the water cavity 18, which can better achieve the lubrication and cooling effect on the rotor assembly 15.

[0051] The rotor cover 37 has a second positioning shaft 25 at the end away from the water cavity 18. The control board 17 has a through hole 39. The second positioning shaft 25 passes through the through hole 39 and is fitted with the control board 17 for limiting. By limiting the control board 17 with the second positioning shaft 25, the number of parts used is reduced and the stability of the control board 17 is improved.

[0052] The first outer shell 1 is integrally formed with a first positioning shaft 21 at the axis position of the flow channel 12, and the pump blade 14 is rotatably connected to the first positioning shaft 21; thereby improving the stability of the rotation of the pump blade 14.

[0053] In one embodiment, the detection module includes a waterless detection unit, which includes a sensing electrode 13. The sensing electrode 13 includes a sensing plate portion 34 and a strip portion 35 electrically connected to the electronic control board 17. The second housing 2 is provided with a mounting groove 36 on the outer periphery of the water cavity 18, and the sensing plate portion 34 is fixed in the mounting groove 36.

[0054] The waterless detection unit employs a capacitive non-contact detection principle. The sensing element 34 of the sensing electrode 13 is separated from the water cavity 18 by a second outer shell 2. When there is no liquid in the water cavity 18, the equivalent capacitance between the sensing element 34 and the surrounding environment is small. When liquid is present in the water cavity 18, the equivalent capacitance between the sensing element 34 and the environment changes due to the higher dielectric constant and conductivity of the liquid compared to air. The waterless detection unit detects this capacitance change and outputs a corresponding signal to determine the presence of liquid in the water cavity 18. This non-contact detection method eliminates the need for the detection electrode to be directly exposed to the liquid, reducing electrode corrosion and scaling, improving detection stability and service life, and reducing the requirements for the sealing structure, thus enhancing the overall reliability and applicability of the structure.

[0055] The DC water pump includes a motor drive module, which is used to drive the water pump motor to rotate forward, reverse, or stop; the motor drive module drives the pump impeller to rotate forward, reverse, or stop. For the specific circuit principle, please refer to 18.

[0056] The detection module includes:

[0057] The waterless detection unit detects the presence of liquid inside the water pump and outputs a water level detection signal to the control board. This unit employs a capacitive non-contact detection principle. The detection pins of the water level detection chip, the sensing electrode, and the capacitor connected to the CR pin together form a capacitive sensing circuit. In a waterless state, the sensing electrode forms a relatively stable parasitic capacitance with the environment. When liquid is present inside the pump, the equivalent capacitance changes due to the liquid's higher dielectric constant and conductivity compared to air. The water level detection chip identifies this change through internal oscillation and frequency / phase detection circuits. When the change exceeds a set threshold, it outputs a corresponding water level detection signal to the control board. The control board uses this signal to determine the presence of liquid inside the pump. Upon detecting a waterless state, it controls the motor to stop running to avoid the heat and noise generated by the pump running dry, thus extending the pump's lifespan.

[0058] The current detection unit detects the operating current in the motor drive unit and outputs a current detection signal to the control board. The current detection unit samples the motor's operating current through a sampling resistor connected in series in the motor circuit. A voltage signal proportional to the current is formed across the sampling resistor. This voltage signal is amplified by an operational amplifier and output to the control board's acquisition port. The control board obtains the actual operating current of the motor by acquiring and calculating this voltage signal. When an abnormally large increase in current is detected, the control board can determine that the motor is in an overload or stalled state and promptly control the motor to stop running or execute corresponding protective actions to reduce the risk of motor damage.

[0059] A temperature detection unit is used to detect the motor temperature and output a temperature detection signal to the electronic control board. The temperature detection unit includes a thermistor and a resistive element that forms a voltage divider structure with it. The resistance of the thermistor changes with temperature, causing a corresponding change in the voltage at the voltage divider node. This voltage is collected by the electronic control board and used to calculate the current temperature value. The electronic control board determines the motor's thermal state based on the temperature information. When the temperature reaches a preset threshold, it controls the motor to stop running or enter a cooling state to avoid performance degradation or damage due to overheating. In some embodiments, the electronic control board can also combine the current detection signal and temperature change trend to assist in determining whether the motor is stalled.

[0060] The voltage detection unit detects the input power supply voltage and outputs a voltage detection signal to the control board. The unit divides the input power supply voltage using a voltage divider network, converting the high-voltage signal into a voltage signal that the control board can acquire. The control board then uses the acquired voltage divider signal to deduce the actual input voltage and compensates for voltage drops in the circuit, thus obtaining a relatively accurate power supply voltage value. When the detected voltage exceeds the set range, the control board stops the motor to achieve overvoltage protection.

[0061] The rotation detection unit detects the motor's rotation status and outputs a rotation detection signal to the control board. This unit includes at least two Hall effect sensors to detect changes in the magnetic field during motor rotation and output pulse signals to the control board. The control board analyzes these pulse signal changes to determine whether the motor is rotating normally, its speed, and its direction of rotation. If the control board detects no change in the pulse signal despite the presence of a drive signal, it determines that the motor is stalled and controls the motor to perform a reverse unwinding action. This short-term reverse drive removes the entanglement on the pump impeller, restoring normal operation.

[0062] This control system monitors the water level, current, temperature, voltage, and rotation status of the water pump in real time through multiple detection units. The electronic control board performs comprehensive analysis and decision control on the various detection signals, realizing functions such as automatic start-stop, overcurrent protection, overtemperature protection, overpressure protection, and stall self-recovery of the water pump, thereby improving the safety, reliability, and service life of the water pump.

[0063] In one embodiment, the current detection unit includes a sampling resistor connected in series in the motor circuit and an operational amplifier connected to the sampling resistor. The operational amplifier amplifies the voltage across the sampling resistor and outputs it to the control board. In another embodiment, the temperature detection unit includes a thermistor and a resistor element connected in series or parallel to form a voltage divider structure. The control board determines the temperature information by acquiring the voltage divider signal. Based on the temperature information, the control board determines whether the motor is stalled and controls the motor to perform a reverse unwinding action when stalling is detected. In another embodiment, the voltage detection unit includes a voltage divider resistor network, which converts the input power supply voltage into a voltage signal that the control board can acquire. In yet another embodiment, the rotation detection unit includes at least two Hall sensors, which detect changes in the magnetic field generated during motor rotation and output pulse signals to the control board. The control board determines whether the motor is stalled based on the state changes of the pulse signals and controls the motor to perform a reverse unwinding action when stalling is detected.

[0064] During motor operation, the current detection unit generates a voltage drop through a sampling resistor connected in series in the motor circuit, and amplifies this voltage signal using an operational amplifier before inputting it to the control board. Simultaneously, the rotation detection unit uses at least two Hall effect sensors to capture real-time changes in the magnetic field generated by the motor's rotation and feeds back pulse signals to the control board. The control board accurately determines the motor's operating status by comprehensively analyzing the changes in the current detection signal and the pulse signal: when the control board detects an abnormal increase in the operating current, and the Hall pulse signal does not change within a preset time (i.e., the motor does not rotate), it determines that the motor is blocked due to impurities entangled. At this time, the control board immediately controls the motor to perform a reverse unwinding action, generating a reverse flushing water flow by changing the rotation direction of the pump impellers, automatically removing or untangling filaments or other impurities from the filter screen, achieving self-cleaning and unblocking. If the blockage cannot be cleared after a preset number of "reverse-stop-forward" cycles, the control board controls the system to stop for manual intervention to prevent hardware damage.

[0065] The explanations of connection methods, directional terms, and other technical terms in this specification are for the purpose of facilitating understanding of the implementation methods and do not constitute a limitation of the present invention. The meanings of each term are as commonly understood by those skilled in the art, and connection relationships can also be achieved through intermediate components. "And / or" indicates any combination of the listed items. The scope of protection of the present invention is defined by the claims. Equivalent substitutions or modifications made within the scope of this invention based on the concept of the present invention should all fall within the scope of protection of the present invention.

Claims

1. A DC water pump with impurity filtration function, comprising a first housing (1) and a second housing (2) assembled together, characterized in that, The first housing (1) and the second housing (2) are connected by a flow channel (12). The first housing (1) is provided with a removable filter screen (6). The first housing (1) is provided with a water inlet (3) on the first side of the filter screen (6). The flow channel (12) is located on the second side of the filter screen (6). The second housing (2) is provided with a motor, a pump blade (14) that is connected to the motor power output shaft, and a control module that is electrically connected to the motor. The control module can control the motor to rotate forward, reverse, or stop.

2. A DC water pump with impurity filtration function according to claim 1, characterized in that, The first outer shell (1) has a receiving cavity (40), which is a cylindrical chamber. The first outer shell (1) has an open end (42) at one end of the receiving cavity (40) and the flow passage (12) is provided at the other end of the receiving cavity (40). The water inlet (3) is arranged radially along the receiving cavity (40). The filter screen (6) is limited and assembled in the receiving cavity (40) by the open end (42), and the open end (42) is equipped with a detachable cover (5).

3. A DC water pump with impurity filtration function according to claim 2, characterized in that, The filter screen (6) includes a disc body (26). Along the axial direction of the receiving cavity (40), the disc body (26) has an arc surface filter (29) on one side and a plate filter (31) located at the edge of the arc surface filter (29). The arc surface filter (29) and the plate filter (31) are provided with a disc filter (32) arranged radially along the receiving cavity (40) at the end away from the disc body (26). The inner peripheral wall of the first outer shell (1) is provided with a limiting rib (43) along its axial direction. The plate filter (31) is radially limited and assembled with the limiting rib (43). The arc surface filter (29), the plate filter (31), and the disc filter (32) are provided with at least one type of filter hole (33). The side of the arc surface filter (29), the plate filter (31), and the disc filter (32) near the water inlet (3) is the first side of the filter screen (6).

4. A DC water pump with impurity filtration function according to claim 3, characterized in that, The disc body (26) has a sealing groove (27) on the side near the arc surface filter (29), and a sealing gasket (20) is installed in the sealing groove (27). The first outer shell (1) has a stepped part (41) and an internal thread part (7) in sequence from the inside to the outside at the opening end (42). The detachable cover (5) has an external thread part (8) that mates with the internal thread part (7). The sealing gasket (20) is partially embedded in the sealing groove (27) and partially sandwiched between the stepped part (41) and the disc body (26). The outer side of the disc body (26) abuts against the detachable cover (5). And / or, the arc-shaped filter section (29) and / or the plate filter section (31) are provided with a column (30) on the side near the water inlet (3).

5. A DC water pump with impurity filtration function according to claim 4, characterized in that, The disc body (26) has a ring-shaped groove (11) at the center of its outer side, and the detachable cover (5) has a buckle (10) at its center. The buckle (10) is engaged in the groove (11) and can rotate within the groove (11) along the axis of the detachable cover (5). And / or the removable cover (5) has a handle (9) on the outside; And / or the disc part (26) has a protrusion (28) on the side near the arc surface filter part (29) and the plate filter part (31).

6. A DC water pump with impurity filtration function according to any one of claims 1-5, characterized in that, The second housing (2) has a water cavity (18) and an electrical cavity (19) separated by a partition. The motor includes a rotor assembly (15) and a stator assembly (16). The control module includes an electrical control board (17) and a detection module. The rotor assembly (15) and the pump blade (14) are located in the water cavity (18), and the stator assembly (16), the electrical control board (17), and the detection module are located in the electrical cavity (19).

7. A DC water pump with impurity filtration function according to claim 6, characterized in that, The rotor assembly (15) includes a main body (22), a magnetic core (24) injection-molded around the main body (22), and a rotating shaft (23) injection-molded or assembled and connected to the axis of the main body (22). The pump blade (14) is integrally injection-molded or assembled and connected to the main body (22). The second outer shell (2) has an integrally formed rotor cover (37). The rotor cover (37) has a rotor slot cavity (44) separated from the electrical cavity (19). One end of the rotor slot cavity (44) is connected to the water cavity (18), and the other end is provided with a positioning groove (38). The main body (22) is assembled in the rotor cover (37), and the rotating shaft (23) is assembled in the positioning groove (38).

8. A DC water pump with impurity filtration function according to claim 7, characterized in that, The rotor cover (37) has a second positioning shaft (25) at one end away from the water cavity (18), and the electronic control board (17) has a through hole (39). The second positioning shaft (25) passes through the through hole (39) and is fitted with the electronic control board (17) for limiting assembly. And / or, the first housing (1) is integrally formed with a first positioning shaft (21) at the axial position of the flow channel (12), and the pump blade (14) is rotatably connected to the first positioning shaft (21); And / or, the detection module includes a waterless detection unit, the waterless detection unit includes a sensing electrode (13), the sensing electrode (13) includes a sensing plate (34) and a strip (35) electrically connected to the control board (17), the second housing (2) is provided with a mounting groove (36) on the outer periphery of the water cavity (18), and the sensing plate (34) is fixed in the mounting groove (36).

9. A DC water pump with impurity filtration function according to any one of claims 7-8, characterized in that, The DC water pump includes a motor drive module, which is used to drive the water pump motor to rotate forward, reverse, or stop. The detection module includes: The waterless detection unit is used to detect whether there is liquid inside the water pump and output a water level detection signal to the electronic control board. A current detection unit is used to detect the operating current in the motor drive unit and output a current detection signal to the electronic control board. A temperature detection unit is used to detect the temperature of the motor and output a temperature detection signal to the electronic control board. A voltage detection unit is used to detect the input power supply voltage and output a voltage detection signal to the electronic control board. The rotation detection unit is used to detect the rotation state of the motor and output a rotation detection signal to the electronic control board.

10. A DC water pump with impurity filtration function according to claim 9, characterized in that, The current detection unit includes a sampling resistor connected in series in the motor circuit and an operational amplifier connected to the sampling resistor. The operational amplifier is used to amplify the voltage across the sampling resistor and output it to the electronic control board. And / or, the temperature detection unit includes a thermistor and a resistive element connected in series or in parallel to form a voltage divider structure. The electronic control board determines the temperature information by acquiring the voltage divider signal. The electronic control board determines whether the motor is stalled based on the temperature information, and controls the motor to perform a reverse unwinding action when stall is determined. And / or, the voltage detection unit includes a voltage divider resistor network, which is used to convert the input power supply voltage into a voltage signal that can be acquired by the electronic control board; And / or, the rotation detection unit includes at least two Hall sensors, which are used to detect changes in the magnetic field generated during the rotation of the motor and output pulse signals to the electronic control board; the electronic control board determines whether the motor is stalled based on the state changes of the pulse signals, and controls the motor to perform a reverse unwinding action when stalling is detected.

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