Self-suction sewage pump convenient to maintain

Abstract

The invention relates to the technical field of self-suction sewage pumps, in particular to a self-suction sewage pump convenient to maintain, which comprises a lower shell and an upper shell, the upper shell and the lower shell form a water pump shell, water inlets are formed in the side parts of the lower shell and the upper shell, and the lower shell is mounted on a base; the drainage pipe is communicated with the top end of the upper shell, the drainage pipe is communicated with the lower part of the lower shell, the first valve is communicated with the outer side wall of the drainage pipe, the second valve and the third valve are respectively communicated with the drainage pipe, and the fourth valve is communicated with the drainage pipe. The fourth valve is arranged at water inlets of the lower shell and the upper shell in a communicating mode, the water inlet device is communicated with the third valve, and the water inlet device is used for conducting back flushing cleaning on the interiors of the lower shell and the upper shell; the complexity of cleaning and maintenance of the sewage pump is reduced, the labor intensity of maintenance of personnel is reduced, the working efficiency is improved, the liquid filling efficiency is improved, and the use functionality is improved.

Description

Technical Field

[0001] This invention relates to the technical field of self-priming sewage pumps, and in particular to a self-priming sewage pump that is easy to maintain. Background Technology

[0002] As the core equipment of a sewage discharge system, the sewage pump's main function is to lift sewage from a lower location to a higher location or transport it to a designated treatment site. Its stable operation directly affects the efficiency and reliability of the sewage discharge system, and is of vital importance for ensuring the normal operation of urban infrastructure, preventing environmental pollution, and protecting public health.

[0003] Currently, among existing sewage pumps, such as the patent with announcement number CN219012888U, this utility model discloses a self-priming sewage pump, including a base plate, a motor, a self-priming pump body, a base and a pump seat, and also includes a coupling mechanism. The coupling mechanism is composed of a pump pressure plate, a positioning hole, a positioning pin, a side connecting plate, a machine pressure plate, a matching hole, bolts, an inner groove and an inner beam. The power output shaft of the motor is embedded into the power input end of the self-priming pump body through a straight key.

[0004] It has been found that existing sewage pumps are difficult to maintain and are not easy to clean internally, which increases the labor intensity of maintenance personnel and reduces the ease of use. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a self-priming sewage pump that reduces the complexity of cleaning and maintaining the sewage pump, lowers the labor intensity of personnel for inspection and maintenance, improves work efficiency, facilitates pre-filling of its internal components with liquid, improves filling efficiency, and enhances its functionality.

[0006] This invention provides a self-priming sewage pump that is easy to maintain. It includes a lower housing and an upper housing, which together form a pump housing. Inlets are provided on the sides of both the lower and upper housings. The lower housing is mounted on a base. The pump also includes an inlet device, a conveying device, a drain pipe, a sewage pipe, a first valve, a second valve, a third valve, and a fourth valve. The drain pipe is connected to the top of the upper housing, and the sewage pipe is connected to the lower part of the lower housing. The first valve is connected to the outer wall of the sewage pipe. The second and third valves are respectively connected to the drain pipe. The fourth valve is connected to the inlets of both the lower and upper housings. The inlet device is connected to the third valve and is used for backflushing and cleaning the interior of the lower and upper housings, as well as for pre-filling the interior with liquid. The conveying device is located inside the lower and upper housings and is used for conveying sewage and providing water pressure to the inlet device. The fourth valve and the drain pipe are connected to an external sewage pipe. With the pipeline connected, after the conveying device is turned on, sewage is drawn through the fourth valve. The sewage then flows through the lower and upper shells and is discharged through the drain pipe, thus achieving sewage transport. When cleaning and maintenance of the lower and upper shells are required, the fourth and second valves are closed, and the first and third valves are opened. At this time, clean water is delivered to the third valve through the water inlet device. The clean water entering the third valve flows through the lower and upper shells and is discharged through the drain pipe and the first valve, thereby backflushing and cleaning the lower and upper shells, reducing the complexity of sewage pump cleaning and maintenance. When the sewage pump needs to be disassembled for maintenance, only the upper shell needs to be disassembled for internal maintenance, reducing the labor intensity of personnel inspection and maintenance and improving work efficiency. By opening the third and fourth valves and closing the second and first valves, after the water inlet device delivers clean water to the lower and upper shells, it is convenient to pre-fill the interior with liquid, improving filling efficiency and enhancing the functionality of use.

[0007] Preferably, the water inlet device includes a water tank, a fifth valve, a pressure tank, a sixth valve, a pneumatic motor, and a first pulverizing blade. The water tank is mounted on a base. The fifth valve is connected to the lower part of the water tank, the pressure tank is connected to the top of the water tank, and the sixth valve is connected to the pressure tank. The pneumatic motor is mounted on the outer wall of the drain pipe. The first pulverizing blade is rotatably mounted inside the drain pipe. The power output end of the pneumatic motor is connected to the first pulverizing blade. The output end of the sixth valve is connected to the pneumatic motor through a pipeline. The fifth valve is connected to the third valve through a pipeline. The water tank is connected to a conveying device; clean water is stored in the water tank. Inside the tank, the conveying device pressurizes the water tank during operation. When cleaning and maintenance of the lower and upper shells are required, the fifth and sixth valves are opened. After the fifth valve is opened, clean water in the tank is conveyed to the upper and lower shells. Then, the water is discharged through the first valve. After the sixth valve is opened, the air pressure in the pressure tank is conveyed to the pneumatic motor to drive it to rotate. The output of the pneumatic motor drives the first pulverizer to rotate, so that the first pulverizer pulverizes the dirt in the water discharged through the drain pipe, avoiding dirt blockage that affects the discharge and improving the convenience of automatic cleaning and maintenance.

[0008] Preferably, the conveying device includes a drive unit, a booster unit, a follower unit, an impeller, a first friction wheel, a second friction wheel, a first sprocket, a second sprocket, a third sprocket, and a turntable. The impeller is rotatably mounted inside the lower and upper housings, and its rear end is connected to the drive unit via a drive shaft. The first friction wheel is mounted on the drive shaft, and the second friction wheel is rotatably mounted on a support unit. The support unit is used to drive the second friction wheel to move up and down. The first sprocket is concentrically connected to the second friction wheel, and the second sprocket is rotatably mounted on the support unit. The third sprocket is mounted on the follower unit, which provides elastic support for the third sprocket. The first, second, and third sprockets are driven by a chain. The turntable is rotatably mounted on a base and is concentrically connected to the second sprocket. The turntable is connected to the water tank via a pressurizing device, which is used to pressurize the water tank. The drive device drives the impeller to rotate via a transmission shaft, which transports the sewage from the lower and upper shells. After the transmission shaft rotates, it drives the first friction wheel to rotate, which in turn drives the second friction wheel to move upward via a support device. The second friction wheel contacts the first friction wheel and then drives the first sprocket to rotate. After the first sprocket rotates, it drives the second sprocket to rotate via a chain, which in turn drives the turntable to rotate. The rotation of the turntable provides power to the pressurizing device, which then begins to pressurize the water tank. After the water tank and the pressure tank are pressurized, the second friction wheel separates from the first friction wheel, which facilitates backflushing or pre-filling the lower and upper shells at any time.

[0009] Preferably, the pressurizing device includes a cylinder, a piston, a connecting rod, a one-way exhaust valve, and a one-way intake valve. The cylinder is mounted on a base, the piston is slidably mounted inside the cylinder, the front end of the connecting rod is rotatably connected to the piston, and the rear end of the connecting rod is rotatably mounted on an eccentric position on the outer wall of the turntable. The one-way exhaust valve and the one-way intake valve are respectively connected to the cylinder, and the output end of the one-way exhaust valve is connected to the water tank through a pipeline. After the turntable rotates, it drives the piston to move back and forth through the connecting rod, so that the piston pressurizes the water tank through the cooperation of the one-way exhaust valve and the one-way intake valve. The pressure in the water tank is simultaneously stored in the pressure tank, which improves the convenience of backflushing and pulverizing dirt in the lower and upper shells.

[0010] Preferably, the support device includes a fixed base, an electric cylinder, a slider, a telescopic rod, and a first spring. The fixed base is mounted on a base, the electric cylinder is mounted on the outer wall of the fixed base, the slider is slidably mounted on the fixed base, the bottom end of the telescopic rod is connected to the moving end of the electric cylinder, the top end of the telescopic rod is connected to the slider, the second friction wheel is rotatably mounted on the slider, and the first spring is fitted onto the telescopic rod. The electric cylinder drives the telescopic rod to move up and down, so that the telescopic rod and the first spring cooperate to support the movement of the slider, thereby causing the slider to drive the second friction wheel to move up and down and separate from or contact the first friction wheel, improving the control convenience of the first sprocket's rotation.

[0011] Preferably, the follower device includes a guide and a second spring. The guide is slidably mounted on the base, and the second spring is fitted onto the guide. The third sprocket is rotatably mounted on the outer wall of the guide. When the second friction wheel drives the first sprocket to move up and down, the first sprocket drives the third sprocket to move through the chain. At this time, the guide and the second spring provide elastic support for the third sprocket, thereby facilitating the tensioning effect of the chain.

[0012] Preferably, it also includes a second crushing blade and a spiral blade, which are respectively installed on the outer wall of the impeller; after the impeller rotates, it drives the second crushing blade and the spiral blade to rotate. After the second crushing blade rotates, it crushes the dirt that enters the lower and upper housings, reducing the blockage of the sewage pump. After the spiral blade rotates, it transports the sewage, improving the sewage transport efficiency.

[0013] Preferably, it also includes connectors, with multiple sets of connectors disposed on the outer side walls of the lower and upper housings; the multiple sets of connectors are fixedly connected by bolts, thereby enabling the lower and upper housings to be assembled and spliced, improving the ease of loading, unloading and maintenance of the lower and upper housings.

[0014] Preferably, it also includes a chassis, which is mounted on a base; this improves the protection of the equipment components.

[0015] Preferably, the drive device includes a motor, which is mounted on a base, and the motor output end is connected to the drive shaft via a spline connection; this improves the ease of installation and removal between the motor and the drive shaft, and enhances the convenience of maintenance.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: it facilitates backflushing cleaning and maintenance of the lower and upper housings, reduces the complexity of cleaning and maintenance of the sewage pump, and when the sewage pump needs to be disassembled for maintenance, only the upper housing needs to be disassembled for internal maintenance, reducing the labor intensity of personnel inspection and maintenance and improving work efficiency. By opening the third and fourth valves and closing the second and first valves, after the water inlet device delivers clean water to the lower and upper housings, it is convenient to pre-fill the interior with liquid, improve the liquid filling efficiency, and enhance the functionality of use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the isometric structure of the present invention; Figure 2 This is a partial isometric structural diagram showing the connection between the upper shell and the drain pipe, etc. Figure 3 This is a partial isometric structural diagram of the connection between the impeller and the second crushing blade, etc. Figure 4 This is a partial isometric structural diagram of the connection between the pressure tank and the sixth valve, etc. Figure 5 This is a partial isometric structural diagram of the connection between the pneumatic motor and the first crushing blade, etc. Figure 6 This is a partial isometric structural diagram of the connection between the second friction wheel and the slider, etc. Figure 7 This is a partial isometric structural diagram of the connection between the water tank and the pressure tank, etc. Figure 8 This is a partial isometric structural diagram of the connection between the electric cylinder and the telescopic rod, etc. Figure 9 This is a partial isometric structural diagram showing the connection between the lower shell and the upper shell, etc. Figure 10 This is a partial isometric structural diagram showing the connection between the lower housing and the sewage pipe, etc.

[0018] In the attached diagram, the following are labeled: 101, lower housing; 102, upper housing; 103, drain pipe; 104, sewage pipe; 105, first valve; 106, second valve; 107, third valve; 108, fourth valve; 201, water tank; 202, fifth valve; 203, pressure tank; 204, sixth valve; 205, pneumatic motor; 206, first crushing blade; 301, impeller; 302, first friction wheel; 303, second friction wheel; 304, first sprocket; 3 05. Second sprocket; 306. Third sprocket; 307. Turntable; 401. Cylinder; 402. Piston; 403. Connecting rod; 404. One-way exhaust valve; 405. One-way intake valve; 501. Fixed base; 502. Electric cylinder; 503. Slider; 504. Telescopic rod; 505. First spring; 601. Guide component; 602. Second spring; 701. Second crushing blade; 702. Spiral blade; 801. Connecting component; 901. Chassis; 1001. Motor. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. Example 1

[0020] The present invention provides a self-priming sewage pump that is easy to maintain, comprising a lower housing 101 and an upper housing 102, wherein the upper housing 102 and the lower housing 101 form a pump housing, and water inlets are provided on the sides of the lower housing 101 and the upper housing 102. The lower housing 101 is mounted on a base. It also includes a water inlet device, a conveying device, a drain pipe 103, a sewage pipe 104, a first valve 105, a second valve 106, a third valve 107, and a fourth valve 108. The drain pipe 103 is connected to the top of the upper housing 102, the sewage pipe 104 is connected to the lower part of the lower housing 101, and the first valve 105 is connected to... A second valve 106 and a third valve 107 are respectively connected to a drain pipe 103 and installed on the outer wall of the drain pipe 104. A fourth valve 108 is connected to the inlet of the lower housing 101 and the upper housing 102. The water inlet device is connected to the third valve 107. The water inlet device is used for backflushing and cleaning the lower housing 101 and the upper housing 102, and is also used for pre-filling the lower housing 101 and the upper housing 102 with liquid. A conveying device is installed inside the lower housing 101 and the upper housing 102. The conveying device is used for conveying sewage and also provides water pressure to the water inlet device. The water inlet device includes a water tank 201, a fifth valve 202, a pressure tank 203, a sixth valve 204, a pneumatic motor 205, and a first pulverizing blade 206. The water tank 201 is mounted on a base. The fifth valve 202 is connected to the lower part of the water tank 201. The pressure tank 203 is connected to the top of the water tank 201. The sixth valve 204 is connected to the pressure tank 203. The pneumatic motor 205 is mounted on the outer wall of the drain pipe 104. The first pulverizing blade 206 is rotatably mounted inside the drain pipe 104. The power output end of the pneumatic motor 205 is connected to the first pulverizing blade 206. The output end of the sixth valve 204 is connected to the pneumatic motor 205 through a pipeline. The fifth valve 202 is connected to the third valve 107 through a pipeline. The water tank 201 is connected to the conveying device. In this embodiment, the fourth valve 108 and the drain pipe 103 are connected to an external sewage pipeline. After the conveying device is turned on, sewage is drawn through the fourth valve 108. Subsequently, the sewage is conveyed through the lower housing 101 and the upper housing 102 and discharged through the drain pipe 103, thus realizing the conveying of sewage. When cleaning and maintenance of the lower housing 101 and the upper housing 102 are required, the fourth valve 108 and the second valve 106 are closed, and the first valve 105 and the third valve 107 are opened. At this time, clean water is conveyed to the third valve 107 through the water inlet device. The clean water entering the third valve 107 passes through the lower housing 101 and the upper housing 102. After flowing, the wastewater is discharged from the drain pipe 104 and the first valve 105, thereby backflushing and cleaning the lower housing 101 and the upper housing 102, reducing the complexity of cleaning and maintaining the wastewater pump. When the wastewater pump needs to be disassembled for maintenance, only the upper housing 102 needs to be disassembled for internal maintenance, reducing the labor intensity of personnel inspection and maintenance and improving work efficiency. By opening the third valve 107 and the fourth valve 108 and closing the second valve 106 and the first valve 105, when the water inlet device delivers clean water to the lower housing 101 and the upper housing 102, it is convenient to pre-fill the interior with liquid, improving the filling efficiency and enhancing the functionality of use. Example 2

[0021] Based on Embodiment 1, the present invention provides a self-priming sewage pump that is easy to maintain. The conveying device includes a drive device, a booster device, a follower device, an impeller 301, a first friction wheel 302, a second friction wheel 303, a first sprocket 304, a second sprocket 305, a third sprocket 306, and a turntable 307. The impeller 301 is rotatably mounted inside the lower housing 101 and the upper housing 102. The rear end of the impeller 301 is connected to the drive device via a drive shaft. The first friction wheel 302 is mounted on the drive shaft, and the second friction wheel 303 is rotatably mounted on a support device. The support device is used for... The second friction wheel 303 is driven to move up and down. The first sprocket 304 is concentrically connected to the second friction wheel 303. The second sprocket 305 is rotatably mounted on the support device. The third sprocket 306 is mounted on the follower device, which is used to elastically support the third sprocket 306. The first sprocket 304, the second sprocket 305 and the third sprocket 306 are driven by a chain. The turntable 307 is rotatably mounted on the base and is concentrically connected to the second sprocket 305. The turntable 307 is connected to the water tank 201 through a pressurizing device, which is used to pressurize the water tank 201. The support device includes a fixed base 501, an electric cylinder 502, a slider 503, a telescopic rod 504, and a first spring 505. The fixed base 501 is mounted on a base, the electric cylinder 502 is mounted on the outer wall of the fixed base 501, the slider 503 is slidably mounted on the fixed base 501, the bottom end of the telescopic rod 504 is connected to the moving end of the electric cylinder 502, the top end of the telescopic rod 504 is connected to the slider 503, the second friction wheel 303 is rotatably mounted on the slider 503, and the first spring 505 is fitted onto the telescopic rod 504. The follower device includes a guide 601 and a second spring 602. The guide 601 is slidably mounted on the base, the second spring 602 is fitted onto the guide 601, and the third sprocket 306 is rotatably mounted on the outer wall of the guide 601. It also includes a second crushing blade 701 and a spiral blade 702, which are respectively installed on the outer wall of the impeller 301; It also includes connectors 801, with multiple sets of connectors 801 disposed on the outer side walls of the lower housing 101 and the upper housing 102; It also includes chassis 901, which is mounted on the base; The drive device includes a motor 1001, which is mounted on a base. The output end of the motor 1001 is connected to the transmission shaft via a spline connection. In this embodiment, clean water is stored inside the water tank 201. The conveying device pressurizes the water tank 201 during operation. When cleaning and maintenance of the lower housing 101 and upper housing 102 are required, the fifth valve 202 and the sixth valve 204 are opened. After the fifth valve 202 is opened, the clean water in the water tank 201 is conveyed to the upper housing 102 and lower housing 101. Then, the water is discharged through the first valve 105. After the sixth valve 204 is opened, the air pressure in the pressure tank 203 is conveyed to the pneumatic motor 205, driving it to rotate. The output of the pneumatic motor 205 drives the first pulverizer 206 to rotate, causing the first pulverizer 206 to pulverize the dirt in the water discharged through the drain pipe 104, preventing dirt blockage and improving the convenience of automatic cleaning and maintenance. The driving device is driven by a transmission shaft. The impeller 301 rotates, transporting sewage from the lower housing 101 and the upper housing 102. The rotation of the drive shaft drives the first friction wheel 302 to rotate, which in turn drives the second friction wheel 303 to move upward through the support device. The second friction wheel 303 comes into contact with the first friction wheel 302 and engages in frictional transmission, thereby causing the second friction wheel 303 to drive the first sprocket 304 to rotate. The rotation of the first sprocket 304 then drives the second sprocket 305 to rotate through the chain, which in turn drives the turntable 307 to rotate. The rotation of the turntable 307 provides power to the pressurizing device, which then begins to pressurize the water tank 201. Once the water tank 201 and the pressure tank 203 are pressurized, the second friction wheel 303 separates from the first friction wheel 302, facilitating backflushing or pre-filling of the lower housing 101 and the upper housing 102 at any time. Example 3

[0022] Based on Embodiment 1, the present invention provides a self-priming sewage pump that is easy to maintain. The booster device includes a cylinder 401, a piston 402, a connecting rod 403, a one-way exhaust valve 404, and a one-way intake valve 405. The cylinder 401 is mounted on a base, the piston 402 is slidably mounted inside the cylinder 401, the front end of the connecting rod 403 is rotatably connected to the piston 402, and the rear end of the connecting rod 403 is rotatably mounted on an eccentric position on the outer wall of the turntable 307. The one-way exhaust valve 404 and the one-way intake valve 405 are also included. 05 is respectively connected to the cylinder 401. The output end of the one-way exhaust valve 404 is connected to the water tank 201 through the pipeline. After the turntable 307 rotates, it drives the piston 402 to move back and forth through the connecting rod 403. This causes the piston 402 to pressurize the water tank 201 through the cooperation of the one-way exhaust valve 404 and the one-way air inlet valve 405. The pressure in the water tank 201 is simultaneously stored in the pressure tank 203, which improves the convenience of backflushing and dirt crushing in the lower shell 101 and the upper shell 102.

[0023] like Figures 1 to 10As shown, this invention provides a self-priming sewage pump that is easy to maintain. During operation, the fourth valve 108 and drain pipe 103 are connected to an external sewage pipeline. After the conveying device is opened, sewage is drawn through the fourth valve 108. The sewage is then conveyed through the lower housing 101 and upper housing 102 before being discharged through the drain pipe 103, thus achieving sewage conveying. When cleaning and maintenance of the lower housing 101 and upper housing 102 are required, the fourth valve 108 and the second valve 106 are closed, and the first valve 105 and the third valve 107 are opened. The water inlet device delivers clean water to the third valve 107. The clean water entering the third valve 107 flows through the lower housing 101 and the upper housing 102 and is discharged from the drain pipe 104 and the first valve 105, thereby backflushing and cleaning the lower housing 101 and the upper housing 102, reducing the complexity of cleaning and maintaining the sewage pump. When the sewage pump needs to be disassembled for maintenance, only the upper housing 102 needs to be disassembled for internal maintenance. After the water inlet device delivers clean water to the lower housing 101 and the upper housing 102, it is convenient to pre-fill the inside with liquid.

[0024] The main functions achieved by this invention are: 1. Reduce the complexity of cleaning and maintaining sewage pumps, reduce the labor intensity of personnel for inspection and maintenance, and improve work efficiency; 2. It facilitates pre-filling the interior with liquid, improving filling efficiency and enhancing functionality; 3. It facilitates automatic pressurization of the water tank 201 during sewage pump operation, and allows for backflushing or pre-filling of the lower housing 101 and upper housing 102 at any time.

[0025] The pneumatic motor 205, electric cylinder 502, and motor 1001 of the self-priming sewage pump of this invention are commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0026] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A self-priming sewage pump that is easy to maintain, comprising a lower housing (101) and an upper housing (102), the upper housing (102) and the lower housing (101) forming a pump housing, with water inlets provided on the sides of the lower housing (101) and the upper housing (102), and the lower housing (101) mounted on a base; characterized in that, It also includes a water inlet device, a conveying device, a drain pipe (103), a sewage pipe (104), a first valve (105), a second valve (106), a third valve (107), and a fourth valve (108). The drain pipe (103) is connected to the top of the upper housing (102), the sewage pipe (104) is connected to the lower part of the lower housing (101), the first valve (105) is connected to the outer wall of the sewage pipe (104), and the second valve (106) and the third valve (107) are respectively connected to the drain pipe (108). 3) The fourth valve (108) is connected to the inlet of the lower shell (101) and the upper shell (102). The water inlet device is connected to the third valve (107). The water inlet device is used for backflushing and cleaning the lower shell (101) and the upper shell (102). The water inlet device is also used for pre-filling the lower shell (101) and the upper shell (102). The conveying device is located in the lower shell (101) and the upper shell (102). The conveying device is used for conveying sewage and for providing water supply pressure to the water inlet device.

2. The self-priming sewage pump that is easy to maintain as described in claim 1, characterized in that, The water inlet device includes a water tank (201), a fifth valve (202), a pressure tank (203), a sixth valve (204), a pneumatic motor (205), and a first pulverizer (206). The water tank (201) is mounted on a base. The fifth valve (202) is connected to the lower part of the water tank (201). The pressure tank (203) is connected to the top of the water tank (201). The sixth valve (204) is connected to the pressure tank (203). The pneumatic motor (205) is mounted on the outer wall of the drain pipe (104). The first pulverizer (206) is rotatably mounted inside the drain pipe (104). The power output end of the pneumatic motor (205) is connected to the first pulverizer (206). The output end of the sixth valve (204) is connected to the pneumatic motor (205) through a pipeline. The fifth valve (202) is connected to the third valve (107) through a pipeline. The water tank (201) is connected to the conveying device.

3. The self-priming sewage pump as described in claim 2, characterized in that, The conveying device includes a drive unit, a booster unit, a follower unit, an impeller (301), a first friction wheel (302), a second friction wheel (303), a first sprocket (304), a second sprocket (305), a third sprocket (306), and a turntable (307). The impeller (301) is rotatably mounted inside the lower housing (101) and the upper housing (102). The rear end of the impeller (301) is connected to the drive unit via a drive shaft. The first friction wheel (302) is mounted on the drive shaft, and the second friction wheel (303) is rotatably mounted on a support device. The support device is used to drive the second friction wheel (303) to move up and down. The first sprocket (304) is concentrically connected to the second friction wheel (303). The second sprocket (305) is rotatably mounted on the support device. The third sprocket (306) is mounted on the follower device, which is used to elastically support the third sprocket (306). The first sprocket (304), the second sprocket (305) and the third sprocket (306) are driven by a chain. The turntable (307) is rotatably mounted on the base and is concentrically connected to the second sprocket (305). The turntable (307) is connected to the water tank (201) through a pressurizing device, which is used to pressurize the water tank (201).

4. The self-priming sewage pump that is easy to maintain as described in claim 3, characterized in that, The pressurization device includes a cylinder (401), a piston (402), a connecting rod (403), a one-way exhaust valve (404), and a one-way intake valve (405). The cylinder (401) is mounted on a base, the piston (402) is slidably mounted inside the cylinder (401), the front end of the connecting rod (403) is rotatably connected to the piston (402), and the rear end of the connecting rod (403) is rotatably mounted on the eccentric position of the outer wall of the turntable (307). The one-way exhaust valve (404) and the one-way intake valve (405) are respectively connected to the cylinder (401), and the output end of the one-way exhaust valve (404) is connected to the water tank (201) through a pipeline.

5. A self-priming sewage pump that is easy to maintain as described in claim 3, characterized in that, The support device includes a fixed seat (501), an electric cylinder (502), a slider (503), a telescopic rod (504), and a first spring (505). The fixed seat (501) is mounted on the base, the electric cylinder (502) is mounted on the outer wall of the fixed seat (501), the slider (503) is mounted on the fixed seat (501) and slides up and down, the bottom end of the telescopic rod (504) is connected to the moving end of the electric cylinder (502), the top end of the telescopic rod (504) is connected to the slider (503), the second friction wheel (303) is rotatably mounted on the slider (503), and the first spring (505) is fitted onto the telescopic rod (504).

6. The self-priming sewage pump as described in claim 3, characterized in that, The follower device includes a guide (601) and a second spring (602). The guide (601) is slidably mounted on the base, and the second spring (602) is fitted onto the guide (601). A third sprocket (306) is rotatably mounted on the outer wall of the guide (601).

7. The self-priming sewage pump as described in claim 3, characterized in that, It also includes a second crushing blade (701) and a spiral blade (702), which are respectively installed on the outer wall of the impeller (301).

8. The self-priming sewage pump as described in claim 1, characterized in that, It also includes connectors (801), with multiple sets of connectors (801) disposed on the outer walls of the lower housing (101) and the upper housing (102).

9. A self-priming sewage pump that is easy to maintain as described in claim 1, characterized in that, It also includes a chassis (901), which is mounted on a base.

10. A self-priming sewage pump that is easy to maintain as described in claim 3, characterized in that, The drive device includes a motor (1001), which is mounted on a base. The output end of the motor (1001) is connected to the transmission shaft via a spline connection.

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