Sewage pump with self-cleaning function and self-cleaning method

Abstract

The invention discloses a sewage pump with a self-cleaning function and a self-cleaning method. The sewage pump with the self-cleaning function comprises a volute; an output shaft of the driving motor A can rotatably extend into the volute; the impeller comprises a wheel disc and a plurality of blades annularly arranged on the wheel disc in an involute shape, and guide rails parallel to the blades are arranged on the two sides of each blade respectively; and the scraping mechanism is arranged on the guide rail in a sliding manner and scrapes along the surfaces of the blades when the impeller rotates reversely so as to scrape dirt on the surfaces of the blades. Meanwhile, the scheme further discloses a self-cleaning method matched with the sewage pump in the scheme, self-cleaning of the sewage pump can be achieved through the equipment and the method, the cleaning work of the impeller of the sewage pump is greatly simplified, the process that the sewage pump needs to be disassembled and assembled in the original cleaning process is omitted, and the cleaning efficiency is improved. And the service life of the seal in the sewage pump is prolonged.

Description

Technical Field

[0001] The invention relates to a sewage pump, in particular to a sewage pump with a self-cleaning function and a self-cleaning method. Background Art

[0002] A sewage pump is a type of mechanical equipment used to pump wastewater or sewage from a low place to a high place or a long distance. It is a type of centrifugal impurity pump. When a sewage pump is immersed in sewage for a long time, a layer of dirt often accumulates on the surface of its impeller. The presence of this dirt layer will not only corrode the impeller, but also reduce the service life of the impeller.

[0003] The existing treatment method is to disassemble the volute of the centrifugal pump after a period of use, and then scrub and clean the impeller inside the volute. However, although this cleaning method can effectively clean the impeller, the repeated disassembly of the volute will reduce the service life of the seal and affect the sealing of the volute. In addition, the procedure for disassembling the volute is complicated, and the slightest carelessness will cause parts to be lost or parts to be improperly installed during reinstallation, affecting the smooth operation of the sewage pump. Summary of the invention

[0004] The object of the present invention is to provide a sewage pump with a self-cleaning function and a self-cleaning method, so as to achieve effective cleaning of the sewage pump impeller without disassembling the sewage pump.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A sewage pump with a self-cleaning function, comprising

[0007] snail shell;

[0008] Drive motor A, the output shaft can be rotated and extended into the volute;

[0009] The impeller comprises a wheel disc and a plurality of blades which are arranged on the wheel disc in an involute shape, wherein guide rails which are parallel to the blades are arranged on both sides of the blades;

[0010] The scraping mechanism is slidably arranged on the guide rail and scrapes along the surface of the blade when the impeller rotates reversely to scrape off the dirt on the surface of the blade.

[0011] Preferably, the scraping mechanism includes a slide seat slidably mounted on a guide rail, a rotating shaft extending along the axial direction of the wheel disc is provided on the slide seat, a rotatable sleeve is provided on the rotating shaft, a scraper with a length the same as the width of the blade is provided on the outer surface of the sleeve, a gear A is coaxially arranged on the upper end of the sleeve, a conveyor belt is wound around the two gears A, a pressure plate is smoothly pressed against the conveyor belt, and the two rotating shafts are inserted into the pressure plate, a damping plate is also provided on the sleeve on the outside, and the damping plate is L-shaped, and when the impeller rotates clockwise, the short side of the damping plate abuts against the end surface of the blade, and the long side extends in the same direction as the blade.

[0012] Preferably, the angle between the scraper and the surface of the blade is less than 45°.

[0013] Preferably, the blade of the scraper is a rounded structure.

[0014] Preferably, a mounting groove extending parallel to the blade trajectory is provided on the side of the wheel disc facing away from the blade, a sealing cover is provided on the mounting groove to form a sealed cavity, and a reciprocating mechanism is provided in the mounting groove; the reciprocating mechanism includes

[0015] A walking device is arranged in the installation slot to move in the installation slot under the control of the switch device;

[0016] The suction device comprises an electromagnet and an iron block, wherein the iron block is mounted on a slide seat and the electromagnet is mounted on a walking device, and the electromagnet is started to attract the iron block and the electromagnet in the air;

[0017] A switch device; comprising a shell embedded in the traveling device, the shell extending along the rotation direction of the wheel disc, a forward start switch and a reverse start switch connected to the electromagnet and the electrical signal of the traveling device are respectively arranged at two ends of the shell, the shell is also provided with two springs respectively arranged at two ends of the shell, the buttons of the forward start switch and the reverse start switch are respectively extended into the springs on the corresponding side, a counterweight ball is also arranged in the shell, the wheel disc is rotated so that the counterweight ball compresses the spring under the action of centrifugal force and presses the forward start switch or the reverse start switch, and stop switches electrically connected to the electromagnet and the traveling device are also arranged on both sides of the traveling device, and after the reciprocating mechanism moves to the two ends of the mounting groove, the stop switch presses against the groove wall of the mounting groove.

[0018] Preferably, the walking device includes a driving motor B installed on an electromagnet, the sealing cover is smoothly pressed against the body of the driving motor B, a gear B is coaxially arranged on the output shaft of the driving motor B, a rack extending in the same direction is arranged on the groove wall of the mounting groove, the gear B is meshed with the rack, and the driving motor B is electrically connected to a forward start switch, a reverse start switch and a stop switch, respectively.

[0019] A self-cleaning method for a sewage pump with a self-cleaning function, comprising:

[0020] S1: After the sewage pump has been running for a period of time, the drive motor A is controlled to rotate in the reverse direction;

[0021] S2: As the driving motor A rotates in the reverse direction, the wheel in the impeller also rotates in the reverse direction. At this time, the damping plate in the scraping mechanism turns over due to the resistance of the water in the volute while following the reverse rotation of the impeller.

[0022] S3: As the damping plate flips, the shaft sleeve connected to the damping plate also rotates, and as the shaft sleeve rotates, the gear A on the shaft sleeve also rotates synchronously with the shaft sleeve. At this time, due to the effect of the conveyor belt, the two shaft sleeves rotate synchronously, and finally the scrapers on the two shaft sleeves can abut on the surface of the blade;

[0023] S4: As the driving motor A continues to reverse, the water in the volute exerts a continuous thrust on the damping plate. While maintaining the damping plate's flipping, the thrust can also exert a thrust on the damping plate, which pushes the damping plate to move along the guide track. As the damping plate moves, the scraper also moves with it and scrapes off the dirt on the blade surface, thereby achieving a scraping and cleaning process for the blade.

[0024] S5: When the scraping process is completed, the motor B reducer is driven to rotate in the forward direction again. At this time, the damping plate in the scraping mechanism is subjected to a force opposite to that during the scraping process. Under this force, the damping plate drives the scraper on the rotating shaft to flip and break away from the contact with the blade. Subsequently, the scraping mechanism is driven by the forward rotating wheel and reset to the initial state due to the action of centrifugal force to prepare for the next scraping process.

[0025] It should be noted that, as a preferred embodiment of the above embodiment,

[0026] In step S4, there are also the following situations:

[0027] S41: The forward start switch in the wheel disc is activated after being pressed by the weight ball due to the reverse rotation of the wheel disc. At this time, the forward start switch drives the drive motor B to rotate, thereby driving the gear B to rotate on the rack. As the gear B rotates, the travel device can move the electromagnet in the installation groove toward the inner side end of the installation groove. When the forward start switch starts the drive motor B, it also controls the electromagnet to start. The electromagnet is then attracted to the iron block on the slide seat. When the electromagnet moves with the travel device, it drives the external scraper mechanism to move synchronously.

[0028] S42: When the walking device moves to the inner end of the installation slot with the electromagnet, the scraping mechanism has finished scraping the blade surface. At this time, a stop switch arranged on the side of the walking device touches the side wall of the inner end of the installation slot, and then the drive motor B in the walking device and the electromagnet in the suction device are turned off through the stop switch;

[0029] When the sewage pump rotates forward again, the following conditions exist in step S5

[0030] S51: As the impeller resumes forward rotation driven by the drive motor A, the reverse start switch is pressed and triggered by the weight ball. At this time, the reverse start switch controls the drive motor B to rotate in the reverse direction, thereby driving the gear B to rotate on the rack. As the gear B rotates, the travel device can move the electromagnet in the installation slot toward the outer end of the installation slot. At this time, the reverse start switch also controls the electromagnet to start. The electromagnet is then attracted to the iron block on the slide seat to drive the external scraping mechanism to move synchronously while following the movement of the travel device;

[0031] S52: When the walking device moves to the outer end of the installation groove with the electromagnet, the scraping mechanism is reset. At this time, a stop switch arranged on the side of the walking device touches the side wall of the outer end of the installation groove, and then the drive motor B in the walking device and the electromagnet in the suction device are turned off through the stop switch to prepare for the next scraping process.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] Through the above structure, this solution can achieve self-cleaning of dirt on the surface of the blades without disassembling the sewage pump, which effectively extends the service life of the sewage pump, simplifies the cleaning process of the sewage pump, and greatly reduces the work intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the present invention;

[0035] Figure 2 is an exploded view of the present invention;

[0036] Figure 3 It is a schematic diagram of the structure of the volute in the present invention after removing the front cover;

[0037] Figure 4 It is a state change diagram of the scraping mechanism in the present invention when performing scraping treatment;

[0038] Figure 5 is a cross-sectional view of the present invention after the drive motor A is removed;

[0039] Figure 6It is a structural view of the impeller of the present invention;

[0040] Figure 7 It is a schematic diagram of the structure of the walking device;

[0041] Figure 8 It is an exploded view of the scraping mechanism.

[0042] Figure numerals: 1. volute 11. front cover 12. rear cover 2. drive motor A 3. impeller 31. wheel disc 311. mounting groove 312. sealing cover 313. rack 32. blade 33. guide rail 4. scraping mechanism 41. slide 42. rotating shaft 43. bushing 44. scraper 45. gear A 46. conveyor belt 47. pressure plate 48. damping plate 481. short side 482. long side 5. reciprocating mechanism 51. walking device 511. drive motor B 512. gear B 52. suction device 521. electromagnet 522. iron block 53. switch device 531. housing 532. forward start switch 533. reverse start switch 534 spring 535. counterweight ball 536. stop switch. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, in the present solution, the rotation direction of the impeller that can pump out sewage through centrifugal force is set to be forward rotation, and the opposite is reverse rotation.

[0047] like Figures 1 to 3 The sewage pump with self-cleaning function comprises a volute 1, which is composed of a front cover 11 and a rear cover 12. It also comprises a drive motor A2, the output shaft of which is sealed and rotatably inserted into the volute and coaxially connected to an impeller 3 in the volute.

[0048] Specific as Figure 3 As shown, the impeller 3 in this scheme includes a wheel disc 31 coaxially connected to the output shaft of the driving motor A and a plurality of blades 32 distributed in an annular direction on the wheel disc, each of which extends outward in an involute shape, so that when the driving motor A drives the impeller to rotate in the forward direction, the blades can throw out the sewage in the volute by centrifugal force. It should be noted that a plurality of guide rails 33 are also provided on the surface of the wheel disc where the blades are provided. These guide rails are distributed on both sides of the blades in pairs and extend parallel to the trajectory of the blades.

[0049] It should be noted that in order to enable this solution to have a self-cleaning function without disassembling the machine, Figure 2 , Figure 3 As shown, several groups of scraping mechanisms 4 are also provided on the impeller, which are slidably arranged on the guide rail 33. When the impeller reverses, the scraping mechanisms can achieve reverse scraping along the surface of the blades through the thrust exerted by the sewage on the scraping mechanisms, thereby scraping off the dirt accumulated on the blades.

[0050] like Figure 3 As shown, the scraping mechanism in the above scheme specifically includes a slide seat 41 slidably arranged on the guide rail, the slide seat is provided with a rotating shaft 42 extending along the axial direction of the wheel disc 31, and a shaft sleeve 43 is rotatably sleeved on the rotating shaft. Figure 8 As shown, a scraper 44 is provided on the outer surface of the sleeve, and the length of the scraper is the same as the width of the blade on the side, so as to ensure that when the scraper abuts against the surface of the blade, it can be in complete line contact with the blade in the width direction. At the same time, a gear A45 is coaxially provided at the upper end of the rotating shaft, and a conveyor belt 46 is wound around the two gears A located on the inner and outer sides of the same blade to ensure that the two gears can keep rotating synchronously. Preferably, the conveyor belt can be a chain structure. In addition, as shown in FIG. Figure 8As shown, a damping plate 48 is connected to the shaft sleeve on the outside of the blade. The damping plate has an L-shaped structure, and when the damping plate is in the initial state (when the sewage pump pumps sewage outward), the short side 481 of the damping plate abuts against the outer end surface of the blade to prevent the damping plate from over-turning due to the force exerted by the sewage on the damping plate, while the long side 482 of the damping plate continues to extend along the extension direction of the blade to ensure that when the impeller rotates in the forward direction, the damping plate will not hinder the smooth rotation of the impeller - that is, the sewage flowing through the blade surface can flow smoothly through the long side surface of the damping plate in the same state.

[0051] It should be noted that if Figure 4 As shown, when the short side 481 on the damping plate 48 is scraping, the angle between it and the blade surface is less than 45°, so as to ensure that the force exerted by the sewage on the damping plate, the component force used to push the damping plate to slide along the guide rail after decomposition is greater than the component force that makes the scraper abut against the blade surface, so as to avoid the scraper being unable to scrape the blade surface due to excessive friction between the scraper and the blade surface.

[0052] In addition, it should be noted that, in the present embodiment, the blade portion of the scraper 44 is a rounded structure, so that the scraper can achieve smooth contact with the blade surface regardless of the angle at which it contacts the blade surface.

[0053] It should be noted that in the above scheme, the scraping mechanism 4 implements the scraping action by relying on the force exerted by the sewage on the damping plate, and the subsequent resetting of the scraping mechanism relies on the centrifugal force generated by the scraping mechanism after the impeller rotates at high speed. However, the above two forces are not very stable, so this scheme also provides a reciprocating mechanism 5 that can improve the movement reliability of the scraping mechanism.

[0054] In order to reduce the impact of dirt in sewage on the reciprocating mechanism, the reciprocating mechanism is arranged in a mounting groove 311 opened on the surface of the wheel disc 31 facing away from the blades, and a sealing cover 312 is provided on the mounting groove to form a sealed cavity to prevent sewage from entering the mounting groove. The reciprocating mechanism 5 in this solution can reciprocate along the track of the mounting groove in the sealed mounting groove 311, and apply traction to the scraping mechanism in the air during the movement to assist the scraping mechanism to move more stably on the guide rail. Specifically, as Figure 5 , Figure 6 As shown, the installation groove 311 opened on the back of the wheel disc has a trajectory extending parallel to the trajectory of the guide rail, and when the reciprocating mechanism is in motion, the scraping mechanism 4 is driven to move synchronously on the guide rail.

[0055] In order to achieve the purpose of the reciprocating mechanism driving the scraping mechanism 4, the reciprocating mechanism in this solution specifically includes a walking device 51, a suction device 52 and a switch device 53. The walking device is arranged in the installation slot to ensure that the reciprocating mechanism can realize reciprocating motion in the installation slot, and the suction device is used to realize the air connection of the scraping mechanism 4 to ensure that when the walking device moves with the suction device, it can drive the scraping mechanism to move together. As for the switch device, it is used to control the forward, reverse and start-stop states of the walking device to ensure that the walking state of the walking device can be adapted to the state of the scraping device.

[0056] like Figure 7 As shown, the walking device specifically includes a driving motor B511 set in the installation groove. The upper end of the body of the driving motor B is a smooth surface, and is in smooth contact with the surface of the sealing cover, so that the driving motor B is constrained by the sealing cover and does not rotate in the installation groove. At the same time, the driving motor B is a dual-output shaft motor, and a gear B512 is coaxially installed on each of the two output shafts of the driving motor. Figure 5 , Figure 6 As shown, a rack 313 extending along the track direction of the mounting groove is provided in the mounting groove, and the rack is meshed with the gear B in the walking device to ensure that the gear B can drive the driving motor B to move along the rack direction when the gear B rotates.

[0057] like Figure 7 , Figure 8 As shown, the suction device 52 includes an electromagnet 521 installed on the body of the driving motor B and an iron block 522 connected to the slide. It should be noted that the electromagnet in this solution has its own battery and is shared with the driving motor B in the walking device as a power source for the operation of the reciprocating mechanism. It should be noted that in this solution, in order to ensure that when the electromagnet works, only the electromagnet itself and the iron block connected to the slide are magnetized to ensure the smooth operation of the traction iron block, the impeller and the scraping mechanism in this solution are made of alloy materials that cannot be magnetized.

[0058] like Figure 7 As shown, in this embodiment, the switch device 53 includes a housing 531, which is embedded in the running device so as to be able to move synchronously with the running device. It should be noted that the housing 531 is in the shape of a long strip and extends along the rotation direction of the wheel disc 31 to ensure that the weighted ball 535 set in the housing can roll to both ends of the housing due to the centrifugal force when the wheel disc rotates. Figure 8As shown, a forward start switch 532 and a reverse start switch 533 are respectively installed at both ends of the housing, and the two switches are respectively connected to the electrical signal of the traveling device to control the forward start and reverse start of the traveling device. The forward start switch is located on the side of the housing close to the inner end of the installation slot, and the reverse start switch is located on the side of the housing close to the outer end of the installation slot, so as to ensure that when the impeller rotates in the forward direction, the counterweight ball presses against the reverse start switch, and when the impeller rotates in the reverse direction, it abuts against the forward start switch. In addition, it should be noted that in order to ensure that the forward start switch and the reverse start switch will not be activated by mistake (the impeller is usually arranged vertically, so part of the shell must be in an upright state, and the counterweight ball in the shell will inevitably fall due to gravity. If the counterweight ball directly contacts the forward start switch or the reverse start switch, then the side will be activated by mistake), two springs 534 are also installed in the shell. The two springs are installed at both ends of the shell, and the buttons of the forward start switch 532 and the reverse start switch 533 are respectively extended into the springs on their sides, so that when the spring is not compressed, the buttons of the forward start switch and the reverse start switch will not be triggered by the counterweight ball. It should be noted that the strength of the spring is sufficient to support the counterweight ball to act on the spring only with its own gravity, and the compression of the spring will not cause the counterweight ball to contact the button. That is, only when the wheel is driven by the drive motor A and rotates at high speed, the counterweight ball with a large centrifugal force can compress the spring to a sufficient compression amount and press to activate the forward start switch or the reverse start switch on its side. In addition, if Figure 7 As shown, a stop switch 536 is provided on both sides of the walking device. When the reciprocating mechanism moves to the inner and outer ends of the mounting groove, the stop switch will contact the groove wall of the mounting groove and be triggered under the pressure of the groove wall, thereby controlling the suction device electrically connected thereto and the walking device to stop working.

[0059] In addition, in combination with the above structure, the present solution also discloses a self-cleaning method, specifically:

[0060] A self-cleaning method for a sewage pump with a self-cleaning function, comprising:

[0061] S1: After the sewage pump has been running for a period of time, the drive motor A is controlled to rotate in the reverse direction;

[0062] S2: As the driving motor A rotates in the reverse direction, the wheel in the impeller also rotates in the reverse direction. At this time, the damping plate in the scraping mechanism turns over due to the resistance of the water in the volute while following the reverse rotation of the impeller.

[0063] S3: As the damping plate flips, the shaft sleeve connected to the damping plate also rotates, and as the shaft sleeve rotates, the gear A on the shaft sleeve also rotates synchronously with the shaft sleeve. At this time, due to the effect of the conveyor belt, the two shaft sleeves rotate synchronously, and finally the scrapers on the two shaft sleeves can abut on the surface of the blade;

[0064] S4: As the driving motor A continues to reverse, the water in the volute exerts a continuous thrust on the damping plate. While maintaining the damping plate's flipping, the thrust can also exert a thrust on the damping plate, which pushes the damping plate to move along the guide track. As the damping plate moves, the scraper also moves with it and scrapes off the dirt on the blade surface, thereby achieving a scraping and cleaning process for the blade.

[0065] S5: When the scraping process is completed, the motor B reducer is driven to rotate in the forward direction again. At this time, the damping plate in the scraping mechanism is subjected to a force opposite to that during the scraping process. Under this force, the damping plate drives the scraper on the rotating shaft to flip and break away from the contact with the blade. Subsequently, the scraping mechanism is driven by the forward rotating wheel and reset to the initial state due to the action of centrifugal force to prepare for the next scraping process.

[0066] Preferably, in step S4, the following situation also exists:

[0067] S41: The forward start switch in the wheel disc is activated after being pressed by the weight ball due to the reverse rotation of the wheel disc. At this time, the forward start switch drives the drive motor B to rotate, thereby driving the gear B to rotate on the rack. As the gear B rotates, the travel device can move the electromagnet in the installation groove toward the inner side end of the installation groove. When the forward start switch starts the drive motor B, it also controls the electromagnet to start. The electromagnet is then attracted to the iron block on the slide seat. When the electromagnet moves with the travel device, it drives the external scraper mechanism to move synchronously.

[0068] S42: When the walking device moves to the inner end of the installation slot with the electromagnet, the scraping mechanism has finished scraping the blade surface. At this time, a stop switch arranged on the side of the walking device touches the side wall of the inner end of the installation slot, and then the drive motor B in the walking device and the electromagnet in the suction device are turned off through the stop switch;

[0069] When the sewage pump rotates forward again, the following conditions exist in step S5

[0070] S51: As the impeller resumes forward rotation driven by the drive motor A, the reverse start switch is pressed and triggered by the weight ball. At this time, the reverse start switch controls the drive motor B to rotate in the reverse direction, thereby driving the gear B to rotate on the rack. As the gear B rotates, the travel device can move the electromagnet in the installation slot toward the outer end of the installation slot. At this time, the reverse start switch also controls the electromagnet to start. The electromagnet is then attracted to the iron block on the slide seat to drive the external scraping mechanism to move synchronously while following the movement of the travel device;

[0071] S52: When the walking device moves to the outer end of the installation groove with the electromagnet, the scraping mechanism is reset. At this time, a stop switch arranged on the side of the walking device touches the side wall of the outer end of the installation groove, and then the drive motor B in the walking device and the electromagnet in the suction device are turned off through the stop switch to prepare for the next scraping process.

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sewage pump with self-cleaning function, characterized in that: include Volute (1); A drive motor A (2), the output shaft of which can be rotatably inserted into the volute (1); An impeller (3) comprising a wheel disc (31) and a plurality of blades (32) arranged in an involute shape on the wheel disc (31), wherein guide rails (33) parallel to the blades (32) are respectively arranged on both sides of the blades (32); The scraping mechanism (4) is slidably mounted on the guide rail (33) and scrapes along the surface of the blade (32) when the impeller (3) rotates in reverse, so as to scrape off dirt on the surface of the blade (32).

2. A sewage pump with self-cleaning function as claimed in claim 1, characterized in that: The scraping mechanism (4) comprises a slide seat (41) slidably mounted on a guide rail (33); a rotating shaft (42) extending axially along the wheel disc (31) is disposed on the slide seat (41); a sleeve (43) is rotatably mounted on the rotating shaft (42); a scraper (44) having a length the same as the width of the blade (32) is disposed on the outer surface of the sleeve (43); a gear A (45) is coaxially mounted on the upper end of the sleeve (43); and two gears A (45) are mounted on the upper ends of the two gears A (45). A conveyor belt (46) is wound around the conveyor belt, a pressure plate (47) is smoothly pressed against the conveyor belt (46), and the two rotating shafts (42) are inserted into the pressure plate (47). A damping plate (48) is also provided on the outer sleeve (43), and the damping plate (48) is L-shaped. When the impeller (3) rotates clockwise, the short side (481) of the damping plate (48) abuts against the end surface of the blade (32), and the long side (482) extends in the same direction as the blade (32).

3. A sewage pump with self-cleaning function as claimed in claim 2, characterized in that: The surface angle between the scraper (44) and the blade (32) is less than 45°.

4. A sewage pump with self-cleaning function as claimed in claim 3, characterized in that: The blade of the scraper (44) is a rounded structure.

5. A sewage pump with self-cleaning function as claimed in claim 4, characterized in that: A mounting groove (311) extending parallel to the trajectory of the blade (32) is also provided on the side of the wheel disc (31) facing away from the blade (32); a sealing cover (312) is provided on the mounting groove (311) to form a sealed cavity; a reciprocating mechanism (5) is provided in the mounting groove (311); the reciprocating mechanism (5) comprises A walking device (51) is arranged in the installation groove (311) so as to move in the installation groove (311) under the control of the switch device (53); The suction device (52) comprises an electromagnet (521) and an iron block (522), wherein the iron block (522) is mounted on the slide seat (41), and the electromagnet (521) is mounted on the walking device (51), and the electromagnet (521) is started to attract the iron block (522) and the electromagnet (521) in the air; The switch device (53) comprises a housing (531) embedded in the traveling device (51), the housing (531) extending in the rotation direction of the wheel disc (31), a forward start switch (532) and a reverse start switch (533) connected to the electromagnet (521) and the electrical signal of the traveling device (51) respectively arranged at two ends of the housing (531), two springs (534) respectively arranged at two ends of the housing (531), and buttons of the forward start switch (532) and the reverse start switch (533) respectively extending into the respective positions of the electromagnet (521) and the traveling device (51). The housing (531) is provided with a weight ball (535) on the side thereof, and the wheel disc (31) is rotated so that the weight ball (535) compresses the spring (534) under the action of centrifugal force and presses against the forward start switch (532) or the backward start switch. Stop switches (536) electrically connected to the electromagnet (521) and the walking device (51) are also provided on both sides of the walking device (51). After the reciprocating mechanism (5) moves to the two ends of the installation groove (311), the stop switch (536) presses against the groove wall of the installation groove (311).

6. A sewage pump with self-cleaning function as claimed in claim 5, characterized in that: The walking device (51) comprises a driving motor B (511) mounted on an electromagnet (521); the sealing cover (312) is smoothly pressed against the body of the driving motor B (511); a gear B (512) is coaxially arranged on the output shaft of the driving motor B (511); a rack (313) extending in the same direction is arranged on the groove wall of the mounting groove (311); the gear B (512) is meshed with the rack (313); and the driving motor B (511) is electrically connected to a forward start switch (532), a reverse start switch (533) and a stop switch (536), respectively.

7. A self-cleaning method for a sewage pump with a self-cleaning function, characterized in that: include S1: After the sewage pump has been running for a period of time, the drive motor A is controlled to rotate in the reverse direction; S2: As the driving motor A rotates in the reverse direction, the wheel in the impeller also rotates in the reverse direction. At this time, the damping plate in the scraping mechanism turns over due to the resistance of the water in the volute while following the reverse rotation of the impeller. S3: As the damping plate flips, the shaft sleeve connected to the damping plate also rotates, and as the shaft sleeve rotates, the gear A on the shaft sleeve also rotates synchronously with the shaft sleeve. At this time, due to the effect of the conveyor belt, the two shaft sleeves rotate synchronously, and finally the scrapers on the two shaft sleeves can abut on the surface of the blade; S4: As the driving motor A continues to reverse, the water in the volute exerts a continuous thrust on the damping plate. While maintaining the damping plate's flipping, the thrust can also exert a thrust on the damping plate, which pushes the damping plate to move along the guide track. As the damping plate moves, the scraper also moves with it and scrapes off the dirt on the blade surface, thereby achieving a scraping and cleaning process for the blade. S5: When the scraping process is completed, the motor B reducer is driven to rotate in the forward direction again. At this time, the damping plate in the scraping mechanism is subjected to a force opposite to that during the scraping process. Under this force, the damping plate drives the scraper on the rotating shaft to flip and break away from the contact with the blade. Subsequently, the scraping mechanism is driven by the forward rotating wheel and reset to the initial state due to the action of centrifugal force to prepare for the next scraping process.

8. The self-cleaning method of a sewage pump with a self-cleaning function as claimed in claim 7, characterized in that: In step S4, there are also the following situations: S41: The forward start switch in the wheel disc is activated after being pressed by the weight ball due to the reverse rotation of the wheel disc. At this time, the forward start switch drives the drive motor B to rotate, thereby driving the gear B to rotate on the rack. As the gear B rotates, the travel device can move the electromagnet in the installation groove toward the inner side end of the installation groove. When the forward start switch starts the drive motor B, it also controls the electromagnet to start. The electromagnet is then attracted to the iron block on the slide seat. When the electromagnet moves with the travel device, it drives the external scraper mechanism to move synchronously. S42: When the walking device moves to the inner end of the installation slot with the electromagnet, the scraping mechanism has finished scraping the blade surface. At this time, a stop switch arranged on the side of the walking device touches the side wall of the inner end of the installation slot, and then the drive motor B in the walking device and the electromagnet in the suction device are turned off through the stop switch; When the sewage pump rotates forward again, the following conditions exist in step S5 S51: As the impeller resumes forward rotation driven by the drive motor A, the reverse start switch is pressed and triggered by the weight ball. At this time, the reverse start switch controls the drive motor B to rotate in the reverse direction, thereby driving the gear B to rotate on the rack. As the gear B rotates, the travel device can move the electromagnet in the installation slot toward the outer end of the installation slot. At this time, the reverse start switch also controls the electromagnet to start. The electromagnet is then attracted to the iron block on the slide seat to drive the external scraping mechanism to move synchronously while following the movement of the travel device; S52: When the walking device moves to the outer end of the installation groove with the electromagnet, the scraping mechanism is reset. At this time, a stop switch arranged on the side of the walking device touches the side wall of the outer end of the installation groove, and then the drive motor B in the walking device and the electromagnet in the suction device are turned off through the stop switch to prepare for the next scraping process.

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