Flow adjusting device and method for self-suction centrifugal pump

Abstract

The invention relates to the technical field of centrifugal pumps, and discloses a self-suction centrifugal pump flow adjusting device and method.The self-suction centrifugal pump flow adjusting device structurally comprises a support, a driving motor set, an elastic coupler, a pump body, a self-suction noise reduction cavity, a dustproof assembly and a variable flow guide noise reduction mechanism. A variable flow guide noise reduction mechanism is mounted in the cavity, when an eccentric column on the rotating disc does eccentric motion, a connecting rod in sliding fit with the eccentric column is driven to swing on the fixing frame, and the connecting rod swings left and right through the limiting effect of a top sliding block, so that a plurality of swinging blocks are driven to swing synchronously; the multiple flow guide blades can be controlled to synchronously rotate, the flow area of the pump body is changed, the flow rate is adjusted, the sound absorption lining plate is installed in the self-absorption noise reduction cavity, noise generated during gas-liquid separation in the pump body can be absorbed through the formed sound absorption holes and the sound absorption cotton layer, and the noise reduction effect is achieved.

Description

Technical Field

[0001] This invention belongs to the field of centrifugal pumps, specifically relating to a flow regulating device and method for a self-priming centrifugal pump. Background Technology

[0002] Self-priming centrifugal pumps are a type of centrifugal pump that does not require priming before each subsequent start-up. They can automatically extract gas from the suction pipe and transport liquid normally. Due to their convenience of not requiring pre-priming, self-priming centrifugal pumps are widely used in water supply and drainage, petrochemical, and municipal engineering fields. When using existing self-priming centrifugal pumps, the flow rate is usually adjusted by changing the pipeline resistance through the valve on the pump outlet pipeline. However, this method increases energy consumption and cannot reduce the noise generated by the fluid flow inside the centrifugal pump. This application proposes a self-priming centrifugal pump flow regulation device and method to improve upon the aforementioned deficiencies. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a self-priming centrifugal pump flow regulation device and method with the function of regulating the flow of a centrifugal pump.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A self-priming centrifugal pump flow regulating device and method are disclosed. The device includes a support, a drive motor unit, a flexible coupling, and a pump body. The drive motor unit is mounted on the top of the support. The output shaft of the drive motor unit is connected to the flexible coupling, and the other end of the flexible coupling is connected to the pump body.

[0005] In one specific implementation scheme, the pump body includes an intake channel, an exhaust channel, an impeller assembly, a self-priming noise reduction chamber, a dustproof assembly, a variable flow-guiding noise reduction mechanism, and an auxiliary adjustment module. One end of the pump body has an intake channel, and the other end has an exhaust channel for discharging water. An impeller assembly is installed inside the pump body, positioned directly below the exhaust channel and connected to a flexible coupling. A self-priming noise reduction chamber is located inside the pump body, between the intake channel and the impeller assembly. The dustproof assembly and the variable flow-guiding noise reduction mechanism are installed inside the self-priming noise reduction chamber, with the variable flow-guiding noise reduction mechanism located at the rear end of the dustproof assembly. An auxiliary adjustment module is installed on the top of the pump body.

[0006] In one specific implementation scheme, the variable flow-guiding noise reduction mechanism includes an annular flow-guiding seat, a sound-absorbing liner, a central plate, a rotating bearing seat, flow-guiding blades, a connecting bearing seat, a swing block, a linkage ring, and a swing mechanism. The annular flow-guiding seat is connected to the outer side of the sound-absorbing liner. A central plate is provided at the center of the annular flow-guiding seat. A plurality of rotating bearing seats are arranged in annular array around the center on the central plate. Flow-guiding blades are installed on each of the rotating bearing seats. The other end of each of the flow-guiding blades is connected to the connecting bearing seat, which passes through the annular flow-guiding seat. One end of each flow-guiding blade passes through the connecting bearing seat and is fixed to the swing block. The other end of the swing block is connected to the linkage ring. A swing mechanism is installed on the outer side of the annular flow-guiding seat, and the swing mechanism is connected to one of the provided sets of swing blocks.

[0007] In one specific implementation, the sound-absorbing liner includes a sound-absorbing cotton layer and a panel layer. The sound-absorbing cotton layer is located on the outermost side of the sound-absorbing liner and is in contact with the inner wall of the self-absorbing noise reduction cavity. The panel layer is installed on the inner side of the sound-absorbing liner and is made of porous ceramic material.

[0008] In one specific implementation, the guide vanes have a streamlined structure, which can reduce the impact resistance of the fluid during flow.

[0009] In one specific implementation, the swing mechanism includes a fixed frame, a motor, a turntable, an eccentric column, a connecting rod, a slider, and a limiting groove. The bottom of the fixed frame is fixed to an annular guide seat. A motor electrically connected to an external control unit is installed on the back side of the fixed frame. The output end of the motor is connected to the turntable. An eccentric column is installed on the surface of the turntable. The eccentric column is located in the moving groove of the connecting rod. One end of the connecting rod is rotatably engaged with the fixed frame. The top of the connecting rod is fixed to the swing block. A slider is slidably engaged at the upper end of the connecting rod. The slider is located inside the limiting groove.

[0010] In one specific implementation scheme, the dustproof assembly includes a semi-toothed ring, wiping blocks, a dustproof plate, a dustproof net, a toothed column, and a handle. Several wiping blocks are evenly arranged on the semi-toothed ring, a dustproof plate is provided on one side of the semi-toothed ring, several dustproof nets are installed on the dustproof plate, a toothed column is engaged on one side of the semi-toothed ring, and a handle is installed on the top of the toothed column. The handle is located outside the pump body.

[0011] In one specific implementation scheme, the wiping block is made of soft rubber, and the area of ​​the wiping block is the same as the blocking part on the dustproof plate. When the wiping block is in contact with it, it is in the initial position state, at which time the wiping block will not block the dustproof net.

[0012] In one specific implementation, a placement cavity is provided on one side of the self-priming noise reduction cavity, the placement cavity is connected to the self-priming noise reduction cavity, the toothed column is located inside the placement cavity, and the pull handle is located outside the placement cavity.

[0013] In one specific implementation scheme, the auxiliary adjustment module includes an air supply channel and an electromagnetic air supply valve. The air supply channel is located at the top of the self-absorption noise reduction cavity and is connected to the self-absorption noise reduction cavity. An electromagnetic air supply valve is installed on the air supply channel.

[0014] In one specific implementation scheme, a vacuum sensor is installed on the inner wall of the air supply channel to detect the vacuum level inside the self-priming chamber.

[0015] According to the above-mentioned technical solution, the present invention provides a self-priming centrifugal pump flow regulation device and method, which has the following beneficial effects: (1) The present invention adds a self-priming noise reduction cavity inside the centrifugal pump and installs a variable flow-guiding noise reduction mechanism inside the cavity. When the eccentric column on the turntable makes eccentric movement, it drives the connecting rod that is slidably engaged with it to swing on the fixed frame. Through the limiting effect of the top slider, the connecting rod swings left and right, thereby driving several swing blocks to swing synchronously. It can control several guide vanes to rotate synchronously, change the flow area of ​​the pump body, and adjust the flow rate.

[0016] (2) The present invention has a sound-absorbing liner installed in the self-priming noise reduction cavity. The sound-absorbing holes and the sound-absorbing cotton layer can absorb the noise generated during the gas-liquid separation inside the pump body, thereby reducing noise.

[0017] (3) The present invention has a dustproof component installed inside the pump body. By moving the toothed column up and down, it can drive the meshing half toothed ring to rotate in both directions. In this way, the dust and impurities adhering to the dustproof net can be wiped and adsorbed by the soft rubber wiping block, so that the dustproof net can maintain the filtration efficiency and prevent dust and impurities from entering the pump body.

[0018] (4) The present invention installs a vacuum sensor on the top of the self-priming noise reduction cavity, and detects the vacuum level inside the self-priming cavity by means of the vacuum sensor. When the vacuum level inside the self-priming noise reduction cavity exceeds the preset threshold, it is opened. With the help of the electromagnetic air supply valve, the pressure inside the self-priming noise reduction cavity can be dynamically adjusted to avoid excessively high vacuum in the cavity, which can lead to cavitation and fluid turbulence noise. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a self-priming centrifugal pump flow regulating device and method according to an embodiment of this application; Figure 2 This is a schematic diagram of the pump body in an embodiment of this application; Figure 3 This is a schematic diagram of the internal cross-section of the pump body in an embodiment of this application; Figure 4 This is a schematic diagram of the variable flow-guiding noise reduction mechanism in the embodiments of this application; Figure 5 This is a schematic diagram of the internal structure of the variable flow-guiding noise reduction mechanism in the embodiments of this application; Figure 6 This is a schematic diagram of the swing mechanism in the embodiments of this application; Figure 7 This is a schematic diagram of the structure of the dustproof component in the embodiments of this application; Figure 8 This is a schematic diagram of the installation structure of the dustproof component in an embodiment of this application; Figure 9 This is a schematic diagram of the auxiliary adjustment module in an embodiment of this application.

[0020] In the diagram: Support-1, Drive motor assembly-2, Flexible coupling-3, Pump body-4, Suction channel-41, Discharge channel-42, Impeller assembly-43, Self-priming noise reduction chamber-44, Dustproof assembly-45, Variable flow guide noise reduction mechanism-46, Auxiliary adjustment module-47, Annular flow guide seat-461, Sound-absorbing liner-462, Center plate-463, Rotating bearing seat-464, Guide vane-465, Connecting bearing seat-466, Swing block-4 67. Linkage ring - 468. Swinging mechanism - 469. Sound-absorbing cotton layer - 11. Panel layer - 12. Fixing frame - 21. Motor - 22. Turntable - 23. Eccentric column - 24. Connecting rod - 25. Slider - 26. Limiting groove - 27. Half toothed ring - 451. Wiping block - 452. Dustproof plate - 453. Dustproof net - 454. Toothed column - 455. Pull handle - 456. Placement cavity - 441. Air supply channel - 471. Electromagnetic air supply valve - 472. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] Example 1: Please refer to Figures 1-6 The specific embodiments of the present invention are as follows: A self-priming centrifugal pump flow regulation device and method are disclosed. The structure includes a support 1, a drive motor unit 2, a flexible coupling 3, and a pump body 4. The drive motor unit 2 is installed on the top of the support 1. The output shaft of the drive motor unit 2 is connected to the flexible coupling 3. The other end of the flexible coupling 3 is connected to the pump body 4. The flexible coupling 3 can reduce the vibration transmission during the operation of the motor unit.

[0023] Please see Figures 2-3 The pump body 4 includes a suction channel 41, a discharge channel 42, an impeller assembly 43, a self-priming noise reduction chamber 44, a dustproof assembly 45, a variable flow-guiding noise reduction mechanism 46, and an auxiliary adjustment module 47. One end of the pump body 4 has a suction channel 41, which can be connected to an external water pipe. The other end of the pump body 4 has a discharge channel 42, which can discharge water. The impeller assembly 43 is installed inside the pump body 4. The impeller assembly 43 is installed directly below the discharge channel 42 and is connected to the flexible coupling 3. The self-priming noise reduction chamber 44 is located inside the pump body 4, between the suction channel 41 and the impeller assembly 43. The dustproof assembly 45 and the variable flow-guiding noise reduction mechanism 46 are installed inside the self-priming noise reduction chamber 44. The variable flow-guiding noise reduction mechanism 46 is located at the rear end of the dustproof assembly 45. The auxiliary adjustment module 47 is installed on the top of the pump body 4, which can detect and adjust the vacuum level inside the pump body 4.

[0024] Please see Figures 4-5 The variable flow-guiding noise reduction mechanism 46 includes an annular flow guide seat 461, a sound-absorbing liner 462, a center plate 463, a rotating bearing seat 464, flow guide vanes 465, a connecting bearing seat 466, a swing block 467, a linkage ring 468, and a swing mechanism 469. The sound-absorbing liner 462 is connected to the outer side of the annular flow guide seat 461. A center plate 463 is provided at the center of the annular flow guide seat 461. Several rotating bearing seats 464 are arranged in annular array around the center of the center plate 463. Flow guide vanes 465 are installed on each of the rotating bearing seats 464. The other end of each of the flow guide vanes 465 is connected to the connecting bearing seat 466. By setting two sets of bearing seats at both ends of the guide vane 465, the guide vane 465 can rotate on the annular guide seat 461. The connecting bearing seat 466 passes through the annular guide seat 461. One end of the guide vane 465 passes through the connecting bearing seat 466 and is fixed to the swing block 467. The other end of the swing block 467 is connected to the linkage ring 468. The linkage ring 468 connects several swing blocks 467 into a whole. A swing mechanism 469 is installed on the outside of the annular guide seat 461. The swing mechanism 469 is connected to one of the swing blocks 467 and can drive it to swing left and right.

[0025] Please see Figure 5 The sound-absorbing liner 462 includes a sound-absorbing cotton layer 11 and a panel layer 12. The sound-absorbing cotton layer 11 is located on the outermost side of the sound-absorbing liner 462 and is in contact with the inner wall of the self-absorbing noise reduction cavity 44. The panel layer 12 is installed on the inner side of the sound-absorbing liner 462. The panel layer 12 is made of porous ceramic material. Through the sound-absorbing holes and the sound-absorbing cotton layer 11, it can absorb the noise generated during gas-liquid separation inside the pump body 4, thereby playing a noise reduction role.

[0026] Please see Figures 4-5 The guide vane 465 has a streamlined structure, which can reduce the impact resistance of the fluid during flow, thereby achieving the effect of noise reduction. Several guide vanes 465 can form a circle to seal the annular guide seat 461.

[0027] Please see Figures 5-6 The swing mechanism 469 includes a fixed frame 21, a motor 22, a turntable 23, an eccentric column 24, a connecting rod 25, a slider 26, and a limiting groove 27. The bottom of the fixed frame 21 is fixed to the annular guide seat 461. The motor 22, which is electrically connected to an external control unit, is installed on the back side of the fixed frame 21. The output end of the motor 22 is connected to the turntable 23 and can drive the turntable 23 to rotate. An eccentric column 24 is installed on the surface of the turntable 23. The eccentric column 24 is located in the moving groove of the connecting rod 25. One end of the connecting rod 25 is rotatably engaged with the fixed frame 21. The top of the connecting rod 25 is fixed to the swing block 467. The upper end of the connecting rod 25 is slidably engaged with the slider 26. The slider 26 is located inside the limiting groove 27 and can move within the limiting groove 27. The limiting groove 27 is opened on the fixed frame 21.

[0028] Please see Figure 6 When the motor 22 drives the turntable 23 and the eccentric column 24 on the turntable 23 to rotate and make eccentric motion, the eccentric column 24 will drive the connecting rod 25 that is slidably engaged with it to swing on the fixed frame 21. Under the limiting action of the top slider 26 and the limiting groove 27, the connecting rod 25 will only swing left and right, thereby driving the swing block 467 fixedly connected to it to swing synchronously. Under the drive of the linkage ring 468, several guide vanes 465 are controlled to rotate synchronously, thereby changing the flow area of ​​the pump body 4 to adjust the flow rate.

[0029] Example 2: Please refer to Figures 7-8 The specific embodiments of the present invention are as follows: Please see Figure 7 The dustproof component 45 includes a semi-toothed ring 451, wiping blocks 452, a dustproof plate 453, a dustproof net 454, a toothed column 455, and a handle 456. Several wiping blocks 452 are arranged at equal intervals on the semi-toothed ring 451. A dustproof plate 453 is provided on one side of the semi-toothed ring 451. Several dustproof nets 454 are installed on the dustproof plate 453. A toothed column 455 is engaged on one side of the semi-toothed ring 451. A handle 456 is installed on the top of the toothed column 455. The handle 456 is located outside the pump body 4.

[0030] Please see Figures 7-8The wiping block 452 is made of soft rubber, and the area of ​​the wiping block 452 is the same as the blocking part on the dustproof plate 453. When the wiping block 452 is in contact with it, it is in the initial position state. At this time, the wiping block 452 will not block the dustproof net 454. Then, by moving the toothed column 455 up and down, it can drive the half toothed ring 451 that meshes with it to rotate in both directions, thereby wiping and adsorbing the dust and impurities adhering to the dustproof net 454 with the help of the wiping block 452.

[0031] Please see Figure 8 A placement cavity 441 is provided on one side of the self-priming noise reduction cavity 44. The placement cavity 441 is connected to the self-priming noise reduction cavity 44. The toothed column 455 is located inside the placement cavity 441, and the toothed column 455 can be limited in its vertical position and moved up and down through the placement cavity 441. The pull handle 456 is located outside the placement cavity 441. By pulling the pull handle 456 up and down, the toothed column 455 can be moved up and down in the placement cavity 441, thereby causing the semi-toothed ring 451 to rotate.

[0032] Based on the above embodiments, a self-priming centrifugal pump flow regulating device is used in the following way: S1, the self-priming centrifugal pump is driven by the drive motor 2 and external water is drawn in through the suction channel 41. After passing through the dustproof component 45 and the variable flow guide and noise reduction mechanism 46, the water enters the impeller assembly 43 inside the pump body 4. Under the vacuum centrifugal action of the impeller assembly 43, the water is discharged through the discharge channel 42 at the top. S2, when the water flows through the variable flow guide noise reduction mechanism 46, the guide vane 465 can reduce the impact resistance of the fluid during flow, and absorb the noise generated during gas-liquid separation through the sound-absorbing holes on the sound-absorbing liner 462 and the sound-absorbing cotton layer 11, thus playing a noise reduction role. S3, when the flow rate needs to be adjusted, the motor 22 drives the turntable 23 and the eccentric column 24 on the turntable 23 to rotate and make eccentric motion. The eccentric column 24 drives the connecting rod 25, which is slidably engaged with it, to swing on the fixed frame 21. Under the limiting action of the top slider 26 and the limiting groove 27, the connecting rod 25 swings left and right, causing the swing block 467 fixedly connected to it to swing synchronously. Under the drive of the linkage ring 468, several guide vanes 465 are controlled to rotate synchronously, thereby changing the flow area of ​​the pump body 4 to adjust the flow rate. S4. After the self-priming centrifugal pump stops running, the dustproof component 45 can block the suction channel 41 to prevent dust and impurities from entering the pump body 4. By moving the toothed column 455 up and down, it can drive the meshing half toothed ring 451 to rotate in both directions, thereby wiping and adsorbing the dust and impurities adhering to the dustproof net 454 with the help of the wiping block 452.

[0033] Example 3: Please refer to Figures 1-9 The specific embodiments of the present invention are as follows: Please see Figure 9 The auxiliary adjustment module 47 includes an air supply channel 471 and an electromagnetic air supply valve 472. The air supply channel 471 is located at the top of the self-priming noise reduction cavity 44 and is connected to the self-priming noise reduction cavity 44. The electromagnetic air supply valve 472 is installed on the air supply channel 471. The electromagnetic air supply valve 472 can dynamically adjust the pressure inside the self-priming noise reduction cavity 44 to avoid excessive vacuum in the cavity, which can lead to cavitation and fluid turbulence noise.

[0034] Please see Figure 9 A vacuum sensor is installed on the inner wall of the air supply channel 471. The vacuum sensor detects the vacuum level inside the self-priming chamber. When the vacuum level inside the self-priming noise reduction chamber 44 exceeds the preset threshold, it is opened. In other operating conditions, such as normal water supply and pressure balancing after shutdown, the air supply channel 471 is closed, forming a mechanical seal to block the liquid outflow channel. One end of the air replenishment channel 471 is connected to the self-priming noise reduction chamber 44. When the centrifugal pump is in the self-priming stage, the chamber is under vacuum and negative pressure, and atmospheric pressure can prevent the liquid from overflowing. During the normal water supply stage, the pressure inside the chamber is close to normal pressure, and the electromagnetic air replenishment valve 472 is closed at this time, so the liquid inside has no outflow power. When the pump stops, opening the electromagnetic air replenishment valve 472 can balance the pressure inside and outside the chamber, so the fluid has no flow kinetic energy. After the pressure inside the chamber is balanced, the valve closes, which can prevent the liquid from flowing back out.

[0035] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0036] The control method of the present invention is through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Therefore, the control method and circuit connection will not be explained in detail in the present invention.

[0037] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A self-priming centrifugal pump flow regulating device and method, comprising a support (1), a drive motor unit (2) located on the top of the support (1), an elastic coupling (3) mounted on the output shaft of the drive motor unit (2), and a pump body (4) located at the other end of the elastic coupling (3); characterized in that: The pump body (4) includes a suction channel (41), a discharge channel (42) located at the other end of the pump body (4), an impeller assembly (43) installed inside the pump body (4), and a self-priming noise reduction chamber (44) opened inside the pump body (4). The self-priming noise reduction chamber (44) is located between the suction channel (41) and the impeller assembly (43). A dustproof component (45) and a variable flow guiding noise reduction mechanism (46) are installed inside the self-priming noise reduction chamber (44). An auxiliary adjustment module (47) is installed on the top of the pump body (4). The variable flow-guiding noise reduction mechanism (46) includes an annular flow guide seat (461), a sound-absorbing liner (462) located outside the annular flow guide seat (461), a center plate (463) located at the center of the annular flow guide seat (461), a plurality of rotating bearing seats (464) arrayed on the center plate (463), and flow guide blades (465) installed on the plurality of rotating bearing seats (464). The other end of the plurality of flow guide blades (465) is connected to a connecting bearing seat (466). The connecting bearing seat (466) passes through the annular flow guide seat (461). One end of the flow guide blade (465) passes through the connecting bearing seat (466) and is fixed to a swing block (467). The other end of the swing block (467) is connected to a linkage ring (468). A swing mechanism (469) is installed on the outside of the annular flow guide seat (461). The swing mechanism (469) is connected to one of the sets of swing blocks (467). The auxiliary adjustment module (47) includes an air supply channel (471) and an electromagnetic air supply valve (472). The air supply channel (471) is located at the top of the self-absorption noise reduction cavity (44) and is connected to the self-absorption noise reduction cavity (44). The electromagnetic air supply valve (472) is installed on the air supply channel (471).

2. The self-priming centrifugal pump flow regulating device and method according to claim 1, characterized in that: The sound-absorbing liner (462) includes a sound-absorbing cotton layer (11) and a panel layer (12). The sound-absorbing cotton layer (11) is located on the outermost side of the sound-absorbing liner (462) and is in contact with the inner wall of the self-absorbing noise reduction cavity (44). The panel layer (12) is installed on the inner side of the sound-absorbing liner (462). The panel layer (12) is made of porous ceramic material.

3. The self-priming centrifugal pump flow regulating device and method according to claim 2, characterized in that: The guide vane (465) has a streamlined structure, and several of the guide vanes (465) can form a circle to seal the annular guide seat (461).

4. The self-priming centrifugal pump flow regulating device and method according to claim 3, characterized in that: The swing mechanism (469) includes a fixed frame (21), a motor (22) mounted on the back side of the fixed frame (21), a turntable (23) located at the output end of the motor (22), and an eccentric column (24) provided on the surface of the turntable (23). The eccentric column (24) is located in the moving groove of the connecting rod (25). One end of the connecting rod (25) is rotatably engaged with the fixed frame (21). The top of the connecting rod (25) is fixed with the swing block (467). The upper end of the connecting rod (25) is slidably engaged with a slider (26). The slider (26) is located inside the limiting groove (27). The limiting groove (27) is opened on the fixed frame (21).

5. The self-priming centrifugal pump flow regulating device and method according to claim 4, characterized in that: The dustproof component (45) includes a semi-toothed ring (451), a plurality of wiping blocks (452) arrayed on the semi-toothed ring (451), a dustproof plate (453) disposed on one side of the semi-toothed ring (451), and a plurality of dustproof nets (454) installed on the dustproof plate (453). A toothed column (455) is engaged on one side of the semi-toothed ring (451), and a handle (456) is installed on the top of the toothed column (455). The handle (456) is located outside the pump body (4).

6. The self-priming centrifugal pump flow regulating device and method according to claim 5, characterized in that: The wiping block (452) is made of soft rubber, and the area of ​​the wiping block (452) is the same as the shielding part on the dustproof plate (453). When the wiping block (452) is in contact with it, it is in the initial position state.

7. The self-priming centrifugal pump flow regulating device and method according to claim 6, characterized in that: The self-priming noise reduction cavity (44) has a placement cavity (441) on one side. The placement cavity (441) is connected to the self-priming noise reduction cavity (44). The toothed column (455) is located inside the placement cavity (441), and the toothed column (455) can be limited in its vertical position through the placement cavity (441). The handle (456) is located outside the placement cavity (441).

8. The self-priming centrifugal pump flow regulating device and method according to claim 7, characterized in that: A vacuum sensor is installed on the inner wall of the gas supply channel (471).

9. A method of using a self-priming centrifugal pump flow regulating device, characterized in that: The method of using the self-priming centrifugal pump flow regulating device according to claim 8 is as follows: S1, the self-priming centrifugal pump is driven by the drive motor unit (2) and external water is drawn in through the suction channel (41). After passing through the dustproof component (45) and the variable flow guide and noise reduction mechanism (46), the water will enter the impeller assembly (43) inside the pump body (4). Under the vacuum centrifugal action of the impeller assembly (43), the water will be discharged through the discharge channel (42) at the top. S2, when the water flows through the variable flow guide noise reduction mechanism (46), the guide vanes (465) can reduce the impact resistance of the fluid during flow, and absorb the noise generated during gas-liquid separation through the sound-absorbing holes on the sound-absorbing liner (462) and the sound-absorbing cotton layer (11), thus playing a noise reduction role. S3, when the flow rate needs to be adjusted, the motor (22) drives the turntable (23) and the eccentric column (24) on the turntable (23) to rotate and make eccentric motion. With the help of the eccentric column (24), the connecting rod (25) that is slidably engaged with it swings on the fixed frame (21). Under the limiting action of the top slider (26) and the limiting groove (27), the connecting rod (25) swings left and right, driving the swing block (467) that is fixedly connected to it to swing synchronously. Under the drive of the linkage ring (468), several guide vanes (465) are controlled to rotate synchronously, thereby changing the flow area of ​​the pump body (4) to adjust the flow rate. S4. When the self-priming centrifugal pump stops running, the dustproof component (45) can block the suction channel (41) to prevent dust and impurities from entering the pump body (4). By moving the toothed column (455) up and down, it can drive the meshing half toothed ring (451) to rotate in both directions, thereby wiping and adsorbing the dust and impurities adhering to the dustproof net (454) with the help of the wiping block (452).

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