Rotary centrifugal pump with self-cleaning function

Abstract

The invention discloses a rotary centrifugal pump with a self-cleaning function, and relates to the technical field of centrifugal pumps, the centrifugal pump comprises a pump body, a rack, a transmission shaft, a driving motor and a cleaning mechanism, the pump body is fixedly connected with the rack, the transmission shaft is rotatably connected with the rack, the driving motor is fixedly connected with the rack, and the output end of the driving motor is in transmission connection with the transmission shaft; the cleaning mechanism is fixedly connected with the rack, communicates with the pump body and is used for cleaning the interior of the pump body; when the centrifugal pump works, the driving motor is started, torque is transmitted to the transmission shaft, so that the transmission shaft rotates on the rack at a certain speed, mechanisms in the pump body are driven to rotate, negative pressure is formed in the pump body, water flow is sucked in for conveying, and when sundries adhere to the pump body, the cleaning mechanism is started to automatically clean the interior of the pump body.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, in particular to a rotary centrifugal pump with a self-cleaning function. Background Art

[0002] Centrifugal pumps are core equipment in the field of fluid transportation and are widely used in industry, agriculture and municipal engineering. However, when traditional centrifugal pumps are used to transport fluids containing impurities (such as sewage and liquids containing particles), sediment accumulation on the impeller surface is prone to occur over a long period of operation. Impurity adhesion can cause blockage of the impeller flow channel, reduced hydraulic efficiency, increased energy consumption, and even cause equipment vibration and abnormal wear, seriously affecting the stability and service life of the pump.

[0003] In the prior art, in order to solve the sedimentation problem, it is usually necessary to regularly shut down and disassemble the pump body for manual cleaning, which is not only cumbersome and costly to maintain, but also interrupts the production process and reduces the overall operating efficiency. In addition, the traditional centrifugal pump lacks real-time monitoring function and cannot accurately judge the degree of sediment accumulation, resulting in the cleaning time relying on experience judgment, which is prone to over-maintenance or insufficient cleaning.

[0004] Some improvement plans attempt to introduce online cleaning systems, but there are often problems such as limited cleaning effects and accelerated component wear during the cleaning process. For example, although conventional high-pressure washing can remove some deposits, it is difficult to thoroughly clean the complex curved surfaces of the blades; some automatic cleaning devices rely on additional power sources, have complex structures and high energy consumption. Therefore, it is urgent to develop a centrifugal pump with efficient self-cleaning function. Summary of the invention

[0005] The object of the present invention is to provide a rotary centrifugal pump with a self-cleaning function to solve the problems raised in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a centrifugal pump includes a pump body, a frame, a transmission shaft, a drive motor and a cleaning mechanism, the pump body is tightly connected to the frame, the transmission shaft is rotatably connected to the frame, the drive motor is tightly connected to the frame, the output end of the drive motor is transmission-connected to the transmission shaft, the cleaning mechanism is tightly connected to the frame, the cleaning mechanism is communicated with the pump body, and the cleaning mechanism is used to clean the inside of the pump body.

[0007] The frame provides stable support for each mechanism. The drive motor is the main power source of the centrifugal pump. When the centrifugal pump is working, the drive motor starts and transmits the torque to the transmission shaft, so that the transmission shaft rotates at a certain speed on the frame, thereby driving the mechanism in the pump body to rotate, forming negative pressure in the pump body, sucking in water for transportation, and when there is debris attached to the pump body, the cleaning mechanism is started to automatically clean the pump body.

[0008] Furthermore, a water inlet and a water outlet are provided on the pump body, an impeller is installed in the pump body, the impeller is drivingly connected to the transmission shaft, the cleaning mechanism includes a liquid supply pump and a liquid distribution plate, the liquid supply pump is tightly connected to the frame, the inlet of the liquid supply pump is connected to the water outlet, the outlet of the liquid supply pump is connected to the liquid distribution plate, the liquid distribution plate is tightly connected to the frame, and the liquid distribution plate is rotatably connected to the transmission shaft.

[0009] The transmission shaft drives the impeller to rotate in the pump body, thereby forming a negative pressure at the water inlet of the pump body, sucking in the water flow and discharging it from the water outlet. Since the water flow contains certain impurities, after the centrifugal pump has been working for a long time, certain impurity particles will be deposited on the surface of the impeller, thereby increasing the resistance to the water flow and reducing the flow rate of the centrifugal pump. At this time, the cleaning water flow is introduced into the surface of the impeller through the cleaning mechanism, and it is automatically cleaned online without stopping for cleaning; during the cleaning operation, the liquid supply pump is started, the water flow at the water outlet is sucked in, and pumped into the liquid distribution plate through the pipe, and then the cleaning water flow is guided to the impeller through the liquid distribution plate for automatic cleaning.

[0010] Furthermore, a cleaning flow channel is provided in the transmission shaft, and a cleaning disk is provided at one end of the transmission shaft close to the impeller. A plurality of blades are arranged circumferentially of the impeller. The cleaning disk is used to clean the debris deposited on the blades. The inlet of the cleaning flow channel is connected to the liquid distribution disk, and the outlet of the cleaning flow channel is connected to the cleaning disk.

[0011] When the centrifugal pump is working, the impeller rotates at high speed, and the continuously rotating blades are always in contact with the water flow. The sediment will adhere to the surface of the blades, destroying the laminar flow state of the fluid flow, increasing friction loss, and increasing the resistance of the fluid through the impeller. The outflowing water velocity will decrease, and the more sediments adhere, the greater the resistance, and the greater the flow rate reduction; after the deposition occurs, the cleaning mechanism is started, and the cleaning water flow entering the distribution disk flows through the cleaning flow channel in the transmission shaft to the cleaning disk, and then the cleaning water flow is guided to the surface of the blades through the cleaning disk, thereby cleaning the surface of the blades.

[0012] Furthermore, a detection component is provided between the blades. The detection component is located at the outlet of the impeller. The detection component is used to detect whether debris is deposited in the impeller.

[0013] The more debris deposited on the blades, the greater the resistance and the faster the flow rate decreases. By detecting the flow rate through the detection component at the impeller outlet, the amount of debris deposited on the blades can be determined. The smaller the detected flow rate, the more debris is deposited.

[0014] Furthermore, the detection assembly includes a fixed block, a guide block, a support spring and a pressure sensor, the fixed block is tightly connected to the impeller, a guide groove and a detection groove are provided on the fixed block, the guide block is slidably connected to the guide groove, a matching column is provided on the guide block, the matching column is slidably connected to the detection groove, the pressure sensor is tightly connected to the inner wall of the detection groove, one end of the support spring is tightly connected to the detection end of the pressure sensor, the other end of the support spring is tightly connected to the matching column, and the pressure sensor is externally connected to the detection system;

[0015] During detection: the guide block and the fixed block move relative to each other.

[0016] When the water flows at a certain speed and hits the guide block, a certain impact force will be generated on the guide block, causing the guide block to deviate upward along the guide groove, and the matching column on the guide block will slide upward along the detection groove, causing the support spring to be compressed and the pressure sensor to be subjected to a certain pressure. The detection system detects the pressure on the pressure sensor and can determine the flow rate of the water flow, that is, the smaller the pressure on the pressure sensor, the smaller the flow rate of the water flow; because the smaller the flow rate of the water flow, the more debris is deposited on the blades, that is, the smaller the pressure on the pressure sensor detected by the detection system, the more debris is deposited on the blades.

[0017] Furthermore, the water-facing surface of the guide block is streamlined.

[0018] The streamlined guide block can reduce resistance and avoid large flow loss.

[0019] Furthermore, a plurality of cavitation channels are arranged circumferentially of the cleaning disc, the inlet of the cavitation channel faces the water-facing surface, the outlet of the cavitation channel is located between two blades, a heating wire is wound around the outside of the cavitation channel, and a contraction section is provided at the outlet of the cavitation channel.

[0020] Since the temperature rise will cause the vapor pressure of the liquid to rise significantly, when the local pressure is lower than the vapor pressure, the liquid will vaporize to form bubbles. Therefore, the higher the temperature of the liquid, the easier it is to produce cavitation. Under normal conditions, the water flows through the cavitation channel and cavitation bubbles are not easy to be generated. When the detection component detects that there is debris attached to a certain blade, the heating wire on the outside of the cavitation channel at the corresponding position is started to heat the water flow, thereby promoting the generation of cavitation bubbles, and further increase the flow rate and reduce the pressure through the contraction section to promote the generation of cavitation bubbles. When the water flow containing cavitation bubbles flows out of the cavitation channel, it will continue to collapse, thereby generating a certain vibration. The debris attached to the blade is cleaned through this vibration, realizing the fixed-point automatic cleaning of the debris on several blades. In addition, if there are more debris attached to the blade, the power of the heating wire at the corresponding position is greater, the temperature of the water flow is higher, the more cavitation bubbles are generated, and the better the cleaning effect is, that is, the cleaning efficiency is automatically controlled according to the amount of debris attached to the blade.

[0021] Furthermore, the outlet of the cleaning channel is provided with a plurality of liquid distribution channels, and a constraint channel is provided on the cleaning disk. The outlet of the constraint channel is located on both sides of the cavitation channel, and the inlet of the constraint channel is connected with the liquid distribution channel. The position of the constraint channel corresponds to the blade.

[0022] Since the vibration generated by the collapse of cavitation bubbles can easily damage the blades, by arranging constraint channels on both sides of the cavitation channel, the cleaning water flow flowing from the cleaning channel into the liquid distribution channel will flow out along the constraint channel, so that the cleaning water flow is located on both sides of the water flow with cavitation bubbles, thereby avoiding the water flow with cavitation bubbles flowing out of the cavitation channel directly contacting the surface of the blades, thereby reducing the loss of the blades. In addition, the cleaning water flow can also flush the surface of the blades in real time to self-clean the surface of the blades.

[0023] Furthermore, the cross section of the constrained flow channel is rectangular.

[0024] The rectangular cross-section of the constraint flow channel can increase the contact area between the cleaning water flow and the blades, thereby improving the cleaning effect.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The cleaning mechanism directs the cleaning water flow directly to the impeller surface through the liquid supply pump, liquid distribution plate and cleaning flow channel in the transmission shaft, realizing online cleaning and avoiding efficiency loss caused by shutdown maintenance.

[0027] 2. The detection component determines the amount of debris deposited by monitoring the change in water flow velocity at the impeller outlet and triggers the cleaning mechanism to work automatically. By combining the cavitation flow channel and the heating wire, the cleaning intensity is dynamically adjusted according to the amount of debris to achieve fixed-point and efficient cleaning. The heating wire is used to increase the local water temperature, reduce the liquid vapor pressure, and promote the generation of cavitation bubbles. The vibration generated by the collapse of the cavitation bubbles effectively peels off the deposits on the blade surface.

[0028] 3. By arranging the constraint flow channel on both sides of the cavitation flow channel and using the cleaning water flow to form a protective layer, the direct impact of cavitation bubbles on the blades is reduced, thereby reducing the risk of wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a partial cross-sectional view of the present invention;

[0031] Figure 3 for Figure 2 A local enlarged view of point A;

[0032] Figure 4 is a schematic diagram of an impeller of the present invention;

[0033] Figure 5is a partial cross-sectional view of the impeller;

[0034] Figure 6 for Figure 5 A partial enlarged view of point B;

[0035] Figure 7 It is a partial cross-sectional view of the transmission shaft;

[0036] Figure 8 for Figure 7 A partial enlarged view of point C;

[0037] Fig. 9 is a partial cross-sectional view of a cleaning disc;

[0038] Fig.10 It is a schematic diagram of the flow direction of the cleaning plate;

[0039] Fig.11 for Fig.10 A partial enlarged view of point D.

[0040] In the figure: 1. pump body; 11. water inlet; 12. water outlet; 2. frame; 3. transmission shaft; 31. cleaning flow channel; 32. liquid distribution flow channel; 4. driving motor; 5. cleaning mechanism; 51. liquid supply pump; 52. liquid distribution plate; 53. cleaning plate; 531. cavitation flow channel; 5311. contraction section; 532. constraint flow channel; 54. heating wire; 6. impeller; 61. blade; 7. detection assembly; 71. fixing block; 711. guide groove; 712. detection groove; 72. guide block; 721. matching column; 73. support spring; 74. pressure sensor. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the present invention.

[0042] Example: Figure 1-Figure 11 As shown, the present invention provides a technical solution of a rotary centrifugal pump with a self-cleaning function. The centrifugal pump includes a pump body 1, a frame 2, a transmission shaft 3, a drive motor 4 and a cleaning mechanism 5. The pump body 1 is tightly connected to the frame 2, the transmission shaft 3 is rotationally connected to the frame 2, the drive motor 4 is tightly connected to the frame 2, the output end of the drive motor 4 is transmission-connected to the transmission shaft 3, the cleaning mechanism 5 is tightly connected to the frame 2, the cleaning mechanism 5 is communicated with the pump body 1, and the cleaning mechanism 5 is used to clean the inside of the pump body 1.

[0043] The frame 2 provides stable support for each mechanism. The drive motor 4 is the main power source of the centrifugal pump. When the centrifugal pump is working, the drive motor 4 is started to transmit the torque to the transmission shaft 3, so that the transmission shaft 3 rotates at a certain speed on the frame 2, thereby driving the mechanism in the pump body 1 to rotate, forming a negative pressure in the pump body 1, sucking in water for transportation, and when there are debris attached to the pump body 1, the cleaning mechanism 5 is started to automatically clean the pump body 1.

[0044] A water inlet 11 and a water outlet 12 are provided on the pump body 1. An impeller 6 is installed in the pump body 1. The impeller 6 is transmission-connected to the transmission shaft 3. The cleaning mechanism 5 includes a liquid supply pump 51 and a liquid distribution plate 52. The liquid supply pump 51 is tightly connected to the frame 2. The inlet of the liquid supply pump 51 is communicated with the water outlet 12. The outlet of the liquid supply pump 51 is communicated with the liquid distribution plate 52. The liquid distribution plate 52 is tightly connected to the frame 2. The liquid distribution plate 52 is rotationally connected to the transmission shaft 3.

[0045] The transmission shaft 3 drives the impeller 6 to rotate in the pump body 1, thereby forming a negative pressure at the water inlet 11 of the pump body 1, sucking in the water flow, and discharging it from the water outlet 12. Since the water flow contains certain impurities, after the centrifugal pump has been working for a long time, certain impurity particles will be deposited on the surface of the impeller, thereby increasing the resistance to the water flow, causing the flow rate of the centrifugal pump to decrease. At this time, the cleaning water flow is introduced into the surface of the impeller 6 through the cleaning mechanism 5, and it is automatically cleaned online without stopping for cleaning; during the cleaning operation, the liquid supply pump 51 is started, the water flow at the water outlet 12 is sucked in, and pumped into the liquid distribution plate 52 through the pipeline, and then the cleaning water flow is guided to the impeller 6 through the liquid distribution plate 52 to automatically clean it.

[0046] A cleaning channel 31 is provided in the transmission shaft 3, and a cleaning disk 53 is provided at one end of the transmission shaft 3 close to the impeller 6. A plurality of blades 61 are arranged circumferentially of the impeller 6. The cleaning disk 53 is used to clean the debris deposited on the blades 61. The inlet of the cleaning channel 31 is connected to the liquid distribution disk 52, and the outlet of the cleaning channel 31 is connected to the cleaning disk 53.

[0047] When the centrifugal pump is working, the impeller 6 rotates at a high speed, and the continuously rotating blades 61 are always in contact with the water flow. The sediment will adhere to the surface of the blades 61, destroying the laminar flow state of the fluid flow, increasing the friction loss, and increasing the resistance of the fluid through the impeller 6. The flow rate of the outflowing water will decrease, and the more sediments adhere, the greater the resistance, and the greater the flow rate reduction; after the deposition occurs, the cleaning mechanism 5 is started, and the cleaning water flow entering the distribution plate 52 flows to the cleaning plate 53 through the cleaning flow channel 31 in the transmission shaft 3, and then the cleaning water flow is guided to the surface of the blade 61 through the cleaning plate 53, thereby cleaning the surface of the blade 61.

[0048] A detection assembly 7 is provided between the blades 61 . The detection assembly 7 is located at the outlet of the impeller 6 . The detection assembly 7 is used to detect whether there are debris deposited in the impeller 6 .

[0049] Since the more debris deposited on the blade 61, the greater the resistance, the faster the flow rate decreases, the amount of debris deposited on the blade 61 can be determined by detecting the flow rate through the detection component 7 at the outlet of the impeller 6. The smaller the detected flow rate, the more debris is deposited.

[0050] The detection assembly 7 includes a fixed block 71, a guide block 72, a support spring 73 and a pressure sensor 74. The fixed block 71 is fastened to the impeller 6. The fixed block 71 is provided with a guide groove 711 and a detection groove 712. The guide block 72 is slidably connected to the guide groove 711. The guide block 72 is provided with a matching column 721. The matching column 721 is slidably connected to the detection groove 712. The pressure sensor 74 is fastened to the inner wall of the detection groove 712. One end of the support spring 73 is fastened to the detection end of the pressure sensor 74. The other end of the support spring 73 is fastened to the matching column 721. The pressure sensor 74 is externally connected to the detection system.

[0051] During detection: the guide block 72 and the fixed block 71 move relative to each other.

[0052] When the water flows at a certain speed and hits the guide block 72, a certain impact force will be generated on the guide block 72, causing the guide block 72 to shift upward along the guide groove 711, and the matching column 721 on the guide block 721 will slide upward along the detection groove 712, so that the support spring 73 is compressed and the pressure sensor 74 is subjected to a certain pressure. The detection system detects the pressure on the pressure sensor 74, and the flow rate of the water flow can be determined, that is, the smaller the pressure on the pressure sensor 74, the smaller the flow rate of the water flow; because the smaller the flow rate of the water flow, the more debris is deposited on the blade 61, that is, the smaller the pressure on the pressure sensor 74 detected by the detection system, the more debris is deposited on the blade 61.

[0053] The water-facing surface of the guide block 72 is streamlined.

[0054] The streamlined guide block 72 can reduce resistance and avoid large flow loss.

[0055] A plurality of cavitation channels 531 are arranged circumferentially of the cleaning disc 53 , the inlet of the cavitation channel 531 faces the water-facing surface, the outlet of the cavitation channel 531 is located between two blades 61 , a heating wire 54 is wound around the outside of the cavitation channel 531 , and a contraction section 5311 is provided at the outlet of the cavitation channel 531 .

[0056] Since the temperature rise will cause the vapor pressure of the liquid to rise significantly, when the local pressure is lower than the vapor pressure, the liquid vaporizes to form bubbles. Therefore, the higher the temperature of the liquid, the easier it is to produce cavitation. Under normal conditions, the water flows through the cavitation channel 531, and it is not easy to produce cavitation bubbles. When the detection component 7 detects that there are debris attached to a certain blade 61, the heating wire 54 outside the cavitation channel 531 at the corresponding position is started to heat the water flow, thereby promoting the generation of cavitation bubbles, and further increase the flow rate through the contraction section 5311, reduce the pressure, and promote the generation of cavitation bubbles. After the water flow containing cavitation bubbles flows out of the cavitation channel 531, it will continue to collapse, thereby generating a certain vibration. Through this vibration, the debris attached to the blade 61 is cleaned, and the fixed-point automatic cleaning of the debris on several blades 61 is realized. In addition, if there are more debris attached to the blade 61, the power of the heating wire 54 at the corresponding position is greater, the temperature of the water flow is higher, the more cavitation bubbles are generated, and the better the cleaning effect is, that is, the cleaning efficiency is automatically controlled according to the amount of debris attached to the blade 61.

[0057] A plurality of liquid distribution channels 32 are provided at the outlet of the cleaning channel 31 , and a constraint channel 532 is provided on the cleaning plate 53 . The outlet of the constraint channel 532 is located on both sides of the cavitation channel 531 , and the inlet of the constraint channel 532 is connected to the liquid distribution channel 32 , and the position of the constraint channel 532 corresponds to the blade 61 .

[0058] Since the vibration generated by the collapse of cavitation bubbles can easily damage the blades, by arranging constraint channels 532 on both sides of the cavitation channel 531, the cleaning water flow flowing from the cleaning channel 31 into the liquid distribution channel 32 will flow out along the constraint channel 532, so that the cleaning water flow is located on both sides of the water flow with cavitation bubbles, thereby avoiding the water flow with cavitation bubbles flowing out of the cavitation channel 531 directly contacting the surface of the blade 61, thereby reducing the loss of the blade 61. In addition, the cleaning water flow can also flush the surface of the blade 61 in real time to self-clean the surface of the blade 61.

[0059] The cross section of the restricting flow channel 532 is rectangular.

[0060] The rectangular cross-section of the restricted flow channel 532 can increase the contact area between the cleaning water flow and the blades 61, thereby improving the cleaning effect.

[0061] The working principle of the present invention is as follows: the driving motor 4 drives the impeller 6 in the pump body to rotate at high speed through the transmission shaft 3. When the impeller 6 rotates, negative pressure is formed at the water inlet of the pump body 1, water is sucked in and discharged from the water outlet, and liquid transportation is realized; when the flow rate decreases due to the deposition of impurities on the surface of the impeller 6, the detection component 7 at the outlet of the impeller 6 indirectly determines the flow rate by measuring the force of the water flow impacting the guide block. The decrease in flow rate indicates that the sediment has increased, triggering the cleaning program, the cleaning mechanism 5 is started, the liquid supply pump draws water from the water outlet, and guides the cleaning water flow to the cleaning disk 53 at the impeller position through the liquid distribution disk 52 and the cleaning flow channel 31 in the transmission shaft 3, directly flushing impurities, realizing online cleaning without stopping; a heating wire 54 is arranged on the outside of the cavitation flow channel 531, which promotes the generation of cavitation bubbles by heating the water flow, and the vibration generated when the bubbles collapse further removes stubborn sediments, and the cleaning efficiency is automatically adjusted with the amount of sediment, combining hydraulic flushing and cavitation effect to achieve efficient and uninterrupted cleaning.

[0062] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A rotary centrifugal pump with self-cleaning function, characterized in that: The centrifugal pump comprises a pump body (1), a frame (2), a transmission shaft (3), a drive motor (4) and a cleaning mechanism (5); the pump body (1) is tightly connected to the frame (2); the transmission shaft (3) is rotationally connected to the frame (2); the drive motor (4) is tightly connected to the frame (2); the output end of the drive motor (4) is transmission-connected to the transmission shaft (3); the cleaning mechanism (5) is tightly connected to the frame (2); the cleaning mechanism (5) is communicated with the pump body (1); and the cleaning mechanism (5) is used to clean the inside of the pump body (1).

2. A rotary centrifugal pump with self-cleaning function according to claim 1, characterized in that: The pump body (1) is provided with a water inlet (11) and a water outlet (12). An impeller (6) is installed in the pump body (1). The impeller (6) is in driving connection with the transmission shaft (3). The cleaning mechanism (5) comprises a liquid supply pump (51) and a liquid distribution plate (52). The liquid supply pump (51) is firmly connected to the frame (2). The inlet of the liquid supply pump (51) is in communication with the water outlet (12). The outlet of the liquid supply pump (51) is in communication with the liquid distribution plate (52). The liquid distribution plate (52) is firmly connected to the frame (2). The liquid distribution plate (52) is rotatably connected to the transmission shaft (3).

3. A rotary centrifugal pump with self-cleaning function according to claim 2, characterized in that: A cleaning flow channel (31) is provided in the transmission shaft (3); a cleaning disc (53) is provided at one end of the transmission shaft (3) close to the impeller (6); a plurality of blades (61) are arranged in the circumferential direction of the impeller (6); the cleaning disc (53) is used to clean debris deposited on the blades (61); an inlet of the cleaning flow channel (31) is connected to a liquid distribution disc (52); and an outlet of the cleaning flow channel (31) is connected to the cleaning disc (53).

4. A rotary centrifugal pump with self-cleaning function according to claim 3, characterized in that: A detection component (7) is provided between the plurality of blades (61), the detection component (7) is located at the outlet of the impeller (6), and the detection component (7) is used to detect whether debris is deposited in the impeller (6).

5. A rotary centrifugal pump with self-cleaning function according to claim 4, characterized in that: The detection assembly (7) comprises a fixed block (71), a guide block (72), a support spring (73) and a pressure sensor (74); the fixed block (71) is tightly connected to the impeller (6); a guide groove (711) and a detection groove (712) are provided on the fixed block (71); the guide block (72) is slidably connected to the guide groove (711); a matching column (721) is provided on the guide block (72); the matching column (721) is slidably connected to the detection groove (712); the pressure sensor (74) is tightly connected to the inner wall of the detection groove (712); one end of the support spring (73) is tightly connected to the detection end of the pressure sensor (74); the other end of the support spring (73) is tightly connected to the matching column (721); and the pressure sensor (74) is externally connected to a detection system; During detection: the guide block (72) and the fixed block (71) move relative to each other.

6. A rotary centrifugal pump with self-cleaning function according to claim 5, characterized in that: The water-facing surface of the guide block (72) is streamlined.

7. A rotary centrifugal pump with self-cleaning function according to claim 3, characterized in that: A plurality of cavitation channels (531) are arranged circumferentially of the cleaning disc (53); the inlet of the cavitation channel (531) faces the water-facing surface; the outlet of the cavitation channel (531) is located between two blades (61); a heating wire (54) is wound around the outer side of the cavitation channel (531); and a contraction section (5311) is provided at the outlet of the cavitation channel (531).

8. A rotary centrifugal pump with self-cleaning function according to claim 7, characterized in that: The outlet of the cleaning flow channel (31) is provided with a plurality of liquid distribution flow channels (32), and the cleaning disc (53) is provided with a constraint flow channel (532), the outlet of the constraint flow channel (532) is located on both sides of the cavitation flow channel (531), the inlet of the constraint flow channel (532) is connected to the liquid distribution flow channel (32), and the position of the constraint flow channel (532) corresponds to the blade (61).

9. A rotary centrifugal pump with self-cleaning function according to claim 8, characterized in that: The cross section of the restricting flow channel (532) is rectangular.

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