A protective structure for the pump shaft of a submersible slurry pump

Abstract

This utility model discloses a protective structure for the pump shaft of a submersible slurry pump, including a shaft body, a protective mechanism, and an auxiliary protective mechanism. The protective mechanism includes a shaft guard tube, a first sealed bearing, a second sealed bearing, and an impeller. The shaft body is rotatably connected to the inside of the shaft guard tube via the first and second sealed bearings. An impeller is fixedly sleeved on the lower side of the outer surface of the shaft body. The auxiliary protective mechanism includes a support cylinder, a third sealed bearing, a water pipe, a duckbill nozzle, a rotary joint, and an outer connecting pipe. Symmetrical support cylinders are provided on the lower side of the outer surface of the shaft guard tube, and the rear ends of the support cylinders are connected to the inside of the shaft guard tube. This protective structure for the pump shaft of the submersible slurry pump, through passive protection of the shaft guard tube and the auxiliary impeller and active protection of the duckbill nozzle angle adjustment, can block extremely fine particles, resulting in better blocking effect, avoiding wear on the pump shaft, and extending the service life of the pump shaft.

Description

Technical Field

[0001] This utility model relates to the field of submersible slurry pump technology, specifically a protective structure for the pump shaft of a submersible slurry pump. Background Technology

[0002] Submersible slurry pumps are vertical, single-stage, single-suction, cantilevered centrifugal pumps with a semi-open impeller. Agitator blades are installed at the impeller suction side extension. They are mainly used in environmental protection, municipal engineering, thermal power plants, gas coking plants, oil refineries, steel mills, mining, papermaking, cement plants, food processing plants, printing and dyeing industries to pump concentrated liquids, heavy oils, oil sludge, turbid liquids, mud, mortar, quicksand, and flowing sludge from urban drainage ditches, as well as fluids containing mud, sand, and slag, and corrosive liquids. The pump shaft is the spine of the pump, and its reliability directly determines the pump's service life. In the harsh working conditions of slurry pumps, especially submersible pumps, protecting the pump shaft from wear and corrosion is of paramount importance in the design. The existing protective structure for the pump shaft of some submersible slurry pumps protects the pump shaft by installing a stationary shaft protector tube on the outside of the pump shaft. The wear-resistant and corrosion-resistant tubular sleeve wraps around the pump shaft, isolating the pump shaft from contact with the external slurry and bearing all wear and corrosion. Then, an auxiliary impeller is installed behind the main impeller, rotating at the same speed as the pump shaft. When the auxiliary impeller rotates, it generates centrifugal force, like a miniature pump, forming a low-pressure zone or vacuum zone at the inlet of the shaft protector tube. This effectively counteracts the positive pressure in the pump chamber, thereby preventing slurry from leaking towards the pump shaft and playing a role in hydrodynamic sealing. The existing protection structure for the pump shaft of this type of submersible slurry pump has the following problems: When protecting the pump shaft of the submersible slurry pump, the auxiliary impeller stops operating when the pump stops, the seal fails, and some extremely fine particles are adsorbed on the surface of the auxiliary impeller. The blocking effect on extremely fine particles is limited, which will cause wear to the pump shaft. Therefore, we propose a protection structure for the pump shaft of the submersible slurry pump. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a protective structure for the pump shaft of a submersible slurry pump. When protecting the pump shaft of the submersible slurry pump, the passive protection of the shaft guard tube and the auxiliary impeller and the active protection of the duckbill nozzle angle adjustment can block extremely fine particles, with better blocking effect, avoid wear on the pump shaft, extend the service life of the pump shaft, and effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a protective structure for the pump shaft of a submersible slurry pump, comprising a shaft body, a protective mechanism, and an auxiliary protective mechanism; Protection mechanism: It includes a shaft guard tube, a first sealed bearing, a second sealed bearing, and an impeller. The shaft is rotatably connected to the inside of the shaft guard tube through the first and second sealed bearings. An impeller is fixedly sleeved on the lower side of the outer surface of the shaft. Auxiliary protection mechanism: It includes a support cylinder, a sealed bearing, a water pipe, a duckbill nozzle, a rotary joint, and an external connecting pipe. The lower side of the outer surface of the shaft protection tube is provided with symmetrical support cylinders. The rear end of each support cylinder is connected to the interior of the shaft protection tube. The interior of the support cylinder is rotatably connected to a water pipe through the sealed bearing. A duckbill nozzle is provided at the water outlet of each water pipe. The front end of each water pipe is fixedly connected to a rotary joint. An external connecting pipe is provided between the rotating ends of the two rotary joints. When protecting the pump shaft of the submersible slurry pump, the passive protection of the shaft protection tube and the auxiliary impeller and the active protection of the duckbill nozzle angle adjustment can block extremely fine particles, resulting in better blocking effect, avoiding wear on the pump shaft, and extending the service life of the pump shaft.

[0005] Furthermore, a microcontroller is provided on the outside of the shaft, and the input terminal of the microcontroller is electrically connected to an external power source to provide electrical connections for various electrical appliances.

[0006] Furthermore, the auxiliary protection mechanism also includes a drive assembly, which includes a worm gear, a worm, and a rotating shaft. A protective cover is provided on the lower side of the outer surface of the protective shaft tube. The left and right sides of the front and rear ends of the protective cover are respectively provided with clearance holes corresponding to the rotary joint. A rotating shaft is rotatably connected between the left and right inner walls of the protective cover. Worms are fixedly sleeved on the outer surfaces of the left and right ends of the rotating shaft. Worm gears are fixedly sleeved on the middle part of the outer surface of the rotary joint. The worm gears are respectively meshed with the vertically adjacent worms to provide a transmission connection.

[0007] Furthermore, the drive assembly also includes an angle sensor, which is located at the left end of the protective cover. The middle part of the angle sensor's counting axis is fixedly connected to the left end of the rotation axis. The angle sensor is bidirectionally electrically connected to the microcontroller to provide angle monitoring.

[0008] Furthermore, the drive assembly also includes a motor, which is located at the right end of the protective cover. The left end of the motor's output shaft is fixedly connected to the right end of the rotation shaft, and the input end of the motor is electrically connected to the output end of the microcontroller to provide rotation drive.

[0009] Furthermore, the shaft guard tube is made of high-chromium cast iron, which improves wear resistance.

[0010] Furthermore, the impeller is made of stainless steel to improve wear resistance.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The protective structure for the pump shaft of this submersible slurry pump has the following advantages: Driven by a motor, the rotating shaft rotates the worm gear and meshing worm wheel. The worm wheel, through a rotary joint, drives the water pipe to rotate inside the support cylinder, thereby adjusting the angle of the duckbill nozzles. When the two duckbill nozzles are in a relatively horizontal position, they form a water wall barrier to block fine particles. When the duckbill nozzles rotate to the downward position, they flush the lower side of the protective shaft tube and the root of the impeller, preventing the adhesion of fine particles. Through the passive protection of the protective shaft tube and the auxiliary impeller, and the active protection of the duckbill nozzle angle adjustment, extremely fine particles can be blocked, resulting in a better blocking effect, avoiding wear on the pump shaft, and extending the service life of the pump shaft. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is an enlarged structural diagram of point A in this utility model; Figure 4 This is an enlarged structural diagram of section B of the present invention.

[0013] In the diagram: 1 Shaft, 2 Protection mechanism, 21 Shaft guard tube, 22 Sealed bearing I, 23 Sealed bearing II, 24 Impeller, 3 Auxiliary protection mechanism, 31 Support cylinder, 32 Sealed bearing III, 33 Water pipe, 34 Duckbill nozzle, 35 Rotary joint, 36 External pipe, 37 Drive assembly, 371 Angle sensor, 372 Worm gear, 373 Worm, 374 Rotary shaft, 375 Motor, 4 Protective cover, 5 Microcontroller. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-4 This embodiment provides a technical solution: a protection structure for the pump shaft of a submersible slurry pump, including a shaft body 1, a protection mechanism 2 and an auxiliary protection mechanism 3. A microcontroller 5 is provided on the outside of the shaft body 1, and the input terminal of the microcontroller 5 is electrically connected to an external power supply. Protection mechanism 2 includes a shaft guard tube 21, a first sealed bearing 22, a second sealed bearing 23, and an impeller 24. The shaft 1 is rotatably connected to the inside of the shaft guard tube 21 via the first sealed bearing 22 and the second sealed bearing 23. (The upper side of the outer surface of the shaft 1 is fixedly connected to the inner ring of the first sealed bearing 22; the upper side of the inner arc surface of the shaft guard tube 21 is fixedly connected to the outer ring of the first sealed bearing 22; the middle part of the outer surface of the shaft 1 is fixedly connected to the inner ring of the second sealed bearing 23; and the middle part of the inner arc surface of the shaft guard tube 21 is fixedly connected to the outer ring of the second sealed bearing 23.) An impeller 24 is fixedly sleeved on the lower side of the outer surface of the shaft 1. The shaft guard tube 21 is made of high-chromium cast iron, and the impeller 24 is made of stainless steel. When protecting the shaft of the submersible slurry pump, the shaft guard tube 21 is installed on an external power source via a connecting flange. Between the machine and the external pump body, sealed bearing 22 and sealed bearing 23 are respectively fixed between the inner wall of the shaft sleeve 21 and the outer wall of the shaft body 1, realizing a dual function. The sealing structure of sealed bearing 22 and sealed bearing 23 prevents slurry from seeping in from the gap between the shaft sleeve 21 and the shaft body 1, avoiding corrosion of the shaft body 1 and the bearing contact area by slurry. Sealed bearing 22 and sealed bearing 23 form two-point positioning for the shaft body, reducing the deflection of the shaft body 1 when it rotates at high speed, and preventing the shaft body 1 from rubbing against the shaft sleeve 21 due to vibration, further reducing the risk of wear. When the shaft body 1 is rotating, the stainless steel impeller 24 on the lower side of the shaft body 1 will block some of the large particles that sink and accumulate them upward to the bottom of the shaft sleeve 21, reducing the particles entering the area between the shaft sleeve 21 and sealed bearing 22 and sealed bearing 23. Auxiliary protection mechanism 3 includes a support cylinder 31, a sealed bearing 32, a water pipe 33, a duckbill nozzle 34, a rotary joint 35, and an outer connecting pipe 36. Symmetrical support cylinders 31 are provided on the lower side of the outer surface of the protective shaft tube 21. The rear ends of the support cylinders 31 are connected to the interior of the protective shaft tube 21. Water pipes 33 are rotatably connected to the interior of the support cylinders 31 via the sealed bearing 32. Duckbill nozzles 34 are provided at the outlets of the rear ends of the water pipes 33. Rotary joints 35 are fixedly connected to the front ends of the water pipes 33. An outer connecting pipe 36 is provided between the rotating ends of the two rotary joints 35. (The fixed ends of the rotary joints 35 are fixedly connected to the front ends of the longitudinally adjacent water pipes 33, and the rotating ends of the rotary joints 35 are fixedly connected to the rear ends of the outer connecting pipes 36. This allows for periodic adjustments.) The sealing ring inside the rotary joint 35 needs to be replaced. Long-term use may cause leakage due to wear of the seal. The sealing ring of the rotary joint 35 needs to be replaced regularly to ensure its sealing performance. The auxiliary protection mechanism 3 also includes a drive assembly 37, which includes a worm gear 372, a worm 373, and a rotating shaft 374. A protective cover 4 is provided on the lower side of the outer surface of the protective shaft tube 21. The left and right sides of the front and rear ends of the protective cover 4 have clearance holes corresponding to the rotary joint 35. The rotating shaft 374 is rotatably connected between the left and right inner walls of the protective cover 4. Worms 373 are fixedly fitted onto the outer surfaces of the left and right ends of the rotating shaft 374. Worm gears 372 are fixedly fitted onto the middle part of the outer surface of the rotary joint 35. The worm gears 372 are respectively connected to the vertically adjacent worm 373. The drive assembly 37 also includes an angle sensor 371, which is located at the left end of the protective cover 4. The middle of the counting shaft of the angle sensor 371 is fixedly connected to the left end of the rotating shaft 374. The angle sensor 371 is bidirectionally electrically connected to the microcontroller 5. The drive assembly 37 also includes a motor 375, which is located at the right end of the protective cover 4. The left end of the output shaft of the motor 375 is fixedly connected to the right end of the rotating shaft 374. The input end of the motor 375 is electrically connected to the output end of the microcontroller 5. When part of the slurry passes through the first barrier, it is connected to an external water source with a certain pressure through the external pipe 36. The external water source forms a closed loop flow path through the external pipe 36, the rotary joint 35, the water pipe 33, and the duckbill nozzle 34, and finally flows through the duckbill nozzle. The nozzles 34 spray water towards the target area. The two duckbill nozzles 34 spray water towards each other to form a positive pressure barrier, isolating the slurry. (When the shaft 1 is rotating, the external water pump is controlled by the microcontroller 5 to operate in advance to spray water. When the shaft 1 stops operating, the water spraying needs to be stopped after an interval of five to ten minutes.) The support cylinder 31 is fixed to the lower side of the protective shaft tube, providing a mounting carrier for the water pipe 33. The sealed bearing 32 connects the support cylinder 31 and the water pipe 33, allowing the water pipe 33 to rotate flexibly while preventing water leakage from the gap between the support cylinder 31 and the water pipe 33, ensuring stable flushing pressure. Then, the motor 375 is operated by the microcontroller 5. The output shaft of the motor 375 drives the rotating shaft 374 to rotate, and the worm gears 373 at both ends of the rotating shaft 374 rotate synchronously.Because the worm 373 meshes with the worm wheel 372 on the rotary joint 35, the rotation of the worm 373 is converted into the rotation of the worm wheel 372. The worm wheel 372 is fixedly connected to the rotary joint 35 and the water pipe 33, ultimately driving the water pipe 33 to rotate around the support cylinder 31, thus adjusting the angle of the duckbill nozzle 34. The angle sensor 371 is fixedly connected to the rotating shaft 374, which can detect the rotation angle of the rotating shaft 374 in real time and feed the angle data back to the microcontroller 5. When the duckbill nozzle 34 needs to rotate 30 degrees, the rotation of the rotating shaft 374 drives the worm 373 and the meshing worm wheel 372 to rotate 30 degrees, which in turn drives the duckbill nozzle 34 to rotate 30 degrees through the adapter 35 and the water pipe 33. The rotation of the duckbill nozzle 34 sprays water covering the entire area under the protective shaft tube 21 and the root of the impeller 24, avoiding dead corners in the rinsing process. The impact force of the water flow can disperse the attached solid particles, preventing accelerated wear.

[0016] The working principle of the protective structure for the pump shaft of a submersible slurry pump provided by this utility model is as follows: When protecting the pump shaft of the submersible slurry pump, the protective shaft tube 21 is installed between the external motor and the external pump body via a connecting flange. Sealing bearing 22 and sealing bearing 23 are respectively fixed between the inner wall of the protective shaft tube 21 and the outer wall of the shaft body 1, achieving a dual function. The sealing structure of sealing bearing 22 and sealing bearing 23 prevents slurry from seeping into the shaft body 1 through the gap between the protective shaft tube 21 and the shaft body 1, avoiding corrosion of the shaft body 1 and the bearing contact area by slurry. Sealing bearing 22 and sealing bearing 23 form two-point positioning for the shaft body, reducing the deflection of the shaft body 1 during high-speed rotation and preventing vibration-induced damage to the shaft body 1. Friction between the rotating shaft and the protective shaft tube 21 further reduces the risk of wear. When the shaft 1 rotates, the stainless steel impeller 24 on the lower side of the shaft 1 will cause some of the large particles that are blocked from sinking to accumulate upwards to the bottom of the protective shaft tube 21, reducing the amount of particles entering the area between the protective shaft tube 21 and the sealing bearing 1 22 and sealing bearing 23. After some of the slurry passes through the first barrier, it is connected to an external water source with a certain pressure through the external pipe 36. The external water source forms a closed loop flow path through the external pipe 36, rotary joint 35, water pipe 33 and duckbill nozzle 34. Finally, water is sprayed onto the target area through the duckbill nozzle 34. The two duckbill nozzles 34 spray water relative to each other to form a positive pressure barrier to isolate the slurry. 31 is fixed to the lower side of the protective tube, providing an installation carrier for the water pipe 33. The sealed bearing 32 connects the support cylinder 31 and the water pipe 33, allowing the water pipe 33 to rotate flexibly while preventing water leakage from the gap between the support cylinder 31 and the water pipe 33, ensuring stable flushing pressure. Then, through the control of the microcontroller 5, the motor 375 operates. The output shaft of the motor 375 drives the rotating shaft 374 to rotate. The worm gears 373 at both ends of the rotating shaft 374 rotate synchronously. Since the worm gears 373 mesh with the worm wheel 372 on the rotary joint 35, the rotation of the worm gears 373 is converted into the rotation of the worm wheel 372. The worm wheel 372 is fixedly connected to the rotary joint 35 and the water pipe 33, ultimately driving... The water pipe 33 rotates around the support cylinder 31 to adjust the angle of the duckbill nozzle 34. The angle sensor 371 is fixedly connected to the rotating shaft 374 and can detect the rotation angle of the rotating shaft 374 in real time and feed the angle data back to the microcontroller 5. When the duckbill nozzle 34 needs to rotate 30 degrees, the rotating shaft 374 drives the worm gear 373 and the meshing worm wheel 372 to rotate 30 degrees, which in turn drives the duckbill nozzle 34 to rotate 30 degrees through the adapter 35 and the water pipe 33. The rotation of the duckbill nozzle 34 sprays water to cover the entire area of ​​the lower side of the protective shaft tube 21 and the root of the impeller 24, avoiding dead corners in the rinsing. The water flow impact force can disperse the attached solid particles and prevent aggravated wear.

[0017] It is worth noting that the angle sensor 371 and motor 375 disclosed in the above embodiments can be selected as E6B2-CWZ6C for the angle sensor 371 and 86CME45-FS for the motor 375. The microcontroller controls the operation of the angle sensor 371 and motor 375 using methods commonly used in the prior art.

[0018] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A protective structure for the shaft of a submersible slurry pump, characterized in that: It includes a shaft (1), a protection mechanism (2), and an auxiliary protection mechanism (3); Protection mechanism (2): It includes a shaft tube (21), a first sealed bearing (22), a second sealed bearing (23) and an impeller (24). The shaft (1) is rotatably connected to the inside of the shaft tube (21) through the first sealed bearing (22) and the second sealed bearing (23). The impeller (24) is fixedly sleeved on the lower side of the outer surface of the shaft (1). Auxiliary protection mechanism (3): It includes a support cylinder (31), a sealing bearing three (32), a water pipe (33), a duckbill nozzle (34), a rotary joint (35), and an outer pipe (36). The lower side of the outer surface of the protective shaft tube (21) is provided with a left-right symmetrical support cylinder (31). The rear end of the support cylinder (31) is connected to the interior of the protective shaft tube (21). The interior of the support cylinder (31) is rotatably connected to the water pipe (33) through the sealing bearing three (32). The outlet of the water pipe (33) is provided with a duckbill nozzle (34). The front end of the water pipe (33) is fixedly connected to the rotary joint (35). An outer pipe (36) is provided between the rotating ends of the two rotary joints (35).

2. The protective structure for the pump shaft of a submersible slurry pump according to claim 1, characterized in that: The shaft (1) is equipped with a microcontroller (5) on its exterior, and the input terminal of the microcontroller (5) is electrically connected to an external power source.

3. The protective structure for the pump shaft of a submersible slurry pump according to claim 2, characterized in that: The auxiliary protection mechanism (3) also includes a drive assembly (37), which includes a worm wheel (372), a worm (373) and a rotating shaft (374). A protective cover (4) is provided on the lower side of the outer surface of the protective shaft tube (21). The left and right sides of the front and rear ends of the protective cover (4) are respectively provided with clearance holes corresponding to the rotary joint (35). The rotating shaft (374) is rotatably connected between the left and right inner walls of the protective cover (4). The worm (373) is fixedly sleeved on the outer surfaces of the left and right ends of the rotating shaft (374). The worm wheel (372) is fixedly sleeved on the middle part of the outer surface of the rotary joint (35). The worm wheel (372) is meshed with the vertically adjacent worm (373).

4. The protective structure for the pump shaft of a submersible slurry pump according to claim 3, characterized in that: The drive assembly (37) also includes an angle sensor (371), which is located at the left end of the protective cover (4). The middle part of the counting axis of the angle sensor (371) is fixedly connected to the left end of the rotating shaft (374). The angle sensor (371) is bidirectionally electrically connected to the microcontroller (5).

5. The protective structure for the pump shaft of a submersible slurry pump according to claim 4, characterized in that: The drive assembly (37) also includes a motor (375), which is located at the right end of the protective cover (4). The left end of the output shaft of the motor (375) is fixedly connected to the right end of the rotating shaft (374), and the input end of the motor (375) is electrically connected to the output end of the microcontroller (5).

6. The protective structure for the pump shaft of a submersible slurry pump according to claim 1, characterized in that: The shaft protector (21) is a high-chromium cast iron shaft protector.

7. The protective structure for the pump shaft of a submersible slurry pump according to claim 1, characterized in that: The impeller (24) is a stainless steel impeller.

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