A flood fighting pump structure adapted to low water level pumping

Abstract

The utility model provides a kind of flood-fighting pump structure suitable for low water level pumping, including pump shaft, impeller, guide vane body assembly, support frame, water outlet pipe and sealing pipe, support frame is fixed in the lower end of guide vane body assembly, the water outlet pipe is fixed in the upper end of guide vane body assembly, the sealing pipe passes through water outlet pipe and is fixedly connected on the inner wall of water outlet pipe by fixed plate, the pump shaft passes through sealing pipe, the impeller is fixed in the lower end of pump shaft and located in the inside of support frame, the upper end of pump shaft is used to connect motor, reach the purpose of effective work under low water level environment.

Description

Technical Field

[0001] This utility model relates to water pumps, and more particularly to a flood control pump structure adapted for pumping water at low water levels. Background Technology

[0002] Currently, axial flow pumps, as an important type of fluid machinery, are widely used in agricultural irrigation, urban drainage, aquaculture, and other fields. Their main working principle is to use the high-speed rotation of the impeller to cause water to flow axially, thereby achieving the purpose of pumping fluid. However, existing axial flow pump structures still have some problems that need improvement in practical applications.

[0003] For example, Chinese utility model patent CN221628480U discloses an axial flow pump impeller structure. This solution achieves convenient installation of the impeller and the motor output end by setting a connecting shaft and a mounting sleeve, and prevents loosening between the connecting shaft and the mounting sleeve through a limiting mechanism, thus facilitating the disassembly, maintenance and replacement of the impeller.

[0004] However, this structure also has certain limitations. Because the axial flow pump places the motor below the impeller, both the impeller and the motor must be completely submerged in water to operate properly. This means that the structure is only suitable for special operating conditions such as high water levels, and cannot work effectively in low water level environments. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a flood control pump structure that is adapted to pumping water at low water levels, so as to achieve the purpose of working effectively in low water level environments.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a flood control pump structure adapted for low water level pumping, including a pump shaft, impeller, guide vane assembly, support frame, outlet pipe and sealing pipe. The support frame is fixed to the lower end of the guide vane assembly, the outlet pipe is fixed to the upper end of the guide vane assembly, the sealing pipe passes through the outlet pipe and is fixedly connected to the inner wall of the outlet pipe by a fixing plate, the pump shaft passes through the sealing pipe, the impeller is fixed to the lower end of the pump shaft and located inside the support frame, and the upper end of the pump shaft is used to connect a motor.

[0007] To achieve the above technical solution, during operation, a motor positioned at the top drives the pump shaft to rotate at high speed. The pump shaft, in turn, drives the impeller fixed at its lower end to rotate within the support frame, powerfully pumping water from low levels. After being pressurized by the impeller, the water is discharged upwards along the guide vane assembly and the outlet pipe. During this process, the sealing pipe, as a crucial isolation component, ensures that the pumped water does not leak upwards along the pump shaft into the motor area. By placing the motor at the top of the pump body and the impeller at the bottom, the structural layout fundamentally solves the problem that traditional axial flow pump motors must be submerged in water to operate, achieving effective pumping only when the impeller is submerged. This significantly enhances the pump's adaptability to low-water conditions, ensuring reliable and efficient pumping and drainage tasks in harsh environments such as floods, greatly expanding the pump's application scenarios and practical value.

[0008] In a preferred embodiment of the present invention, the support frame includes a base plate, a support ring, and a plurality of support columns. The support columns are fixed between the support ring and the base plate, and the plurality of support columns are evenly distributed along the axis of the support ring.

[0009] To achieve the above technical solution, a stable and reliable pump body bottom support system is constructed through a base plate, a support ring, and multiple evenly distributed support columns. During pump operation, this support frame provides stable support for the upper guide vane assembly and the entire pump body, and protects the internal impeller from direct impact from large external debris. The multiple support columns ensure that the weight from the upper structure and vibrations during operation are evenly distributed and borne.

[0010] In a preferred embodiment of this utility model, the upper edge of the support ring extends outward to form an upper connecting ring for connection with the guide vane assembly, and the lower edge of the support ring extends outward to form a lower connecting ring for fixed connection with the support column. A reinforcing plate is fixedly connected between the upper connecting ring and the lower connecting ring, and the side wall of the reinforcing plate is fixedly connected to the outer wall of the support ring.

[0011] To achieve the above technical solution, an upper connecting ring extending from the upper edge of the support ring is precisely connected to the guide vane assembly, while a lower connecting ring extending from the lower edge of the support ring is firmly connected to the support column. A reinforcing plate, fixed between the upper and lower connecting rings and connected to the outer wall of the support ring, plays a crucial role in strengthening and stabilizing the pump body when subjected to fluid impact and internal vibration. By adding the upper and lower connecting rings and the reinforcing plate, the mechanical properties of the connection area between the support frame and the guide vane assembly are significantly enhanced. This greatly improves the structural strength and torsional and bending resistance of this critical connection point, ensuring a firm and durable connection between the support frame and the upper structure of the pump body. It effectively avoids structural loosening or damage caused by stress concentration, thereby enhancing the overall durability and operational safety of the pump.

[0012] As a preferred embodiment of this utility model, it also includes a filter ring that serves as a support. The filter ring has multiple filter holes, all the support columns are located inside the filter ring, the filter ring is fixed to the outer wall of the support columns by fixing bolts, the upper surface of the filter ring abuts against the lower surface of the lower connecting ring, the lower surface of the filter ring is flush with the lower surface of the base plate, and the base plate has multiple through holes.

[0013] To achieve the above technical solution, during operation, the external water flow first passes through multiple filter holes on the filter ring before being drawn into the impeller. During this process, the filter ring, fixed to the outer wall of the support column, effectively intercepts larger stones, branches, and other solid debris in the water, preventing them from entering the pump body. Without adding excessive complexity to the structure, effective filtration of the water entering the pump body is achieved, thus protecting the impeller from damage or blockage caused by debris impacts.

[0014] As a preferred embodiment of this utility model, the guide vane assembly includes a central cylinder, a pump casing, and multiple guide vanes. The lower end of the pump casing is fixedly connected to an upper connecting ring, and the upper end of the pump casing is fixedly connected to a water outlet pipe. The central cylinder is located inside the pump casing and is coaxially arranged. The two ends of the guide vanes are fixedly connected to the outer wall of the central cylinder and the inner wall of the pump casing, respectively. The multiple guide vanes are evenly distributed along the axis of the central cylinder. The pump shaft passes through the central cylinder and is fixedly connected to an impeller. There is a first gap between the upper surface of the impeller and the lower surface of the central cylinder, and a second gap between the upper end of the central cylinder and the outer wall of the pump shaft.

[0015] To achieve the above technical solution, during pump operation, the water flow, pressurized by the high-speed rotation of the impeller, enters the guide vane assembly in a rotating state. Multiple guide vanes fixed between the pump casing and the central cylinder regulate and guide the rotating water flow, efficiently converting its kinetic energy into pressure energy and eliminating the rotational component of the water flow, allowing it to enter the outlet pipe in a more stable axial flow state. The pump shaft passes through the central cylinder and connects to the impeller below. This achieves effective conversion of fluid energy, significantly improving the pump's hydraulic efficiency, reducing energy loss, and enhancing the stability of the outlet water flow. By setting a first gap between the upper surface of the impeller and the lower surface of the central cylinder, the high-pressure fluid at the impeller outlet can enter the internal flow channel of the guide vane assembly. Subsequently, this high-pressure fluid continues to flow upward along the flow channel, entering the structural space above the central cylinder through a second gap between the upper end of the central cylinder and the outer wall of the pump shaft. This causes the high-pressure fluid to generate a downward force above the central cylinder, which effectively counteracts the upward axial thrust generated by the impeller during operation. Through the combined effect of the first and second gaps, the net axial thrust on the pump shaft is significantly reduced, effectively alleviating the load on the bearings and ensuring the long-term stable and reliable operation of the pump.

[0016] As a preferred embodiment of this utility model, a support rib is fixedly connected to the inner wall of the central cylinder, and a plurality of the support ribs are evenly distributed along the axis of the central cylinder. A support pipe is fixedly connected to one end of the support rib away from the inner wall of the central cylinder, and the pump shaft passes through the support pipe and is rotatably connected to the inner wall of the support pipe.

[0017] To achieve the above technical solution, when the pump shaft rotates at high speed, multiple support ribs fixed to the inner wall of the central cylinder firmly position the support tube at the axial center of the central cylinder. The pump shaft passes through this support tube and forms a rotatable connection with its inner wall, thereby obtaining a stable and precise radial support point. By adding support ribs and support tubes inside the central cylinder, a robust internal support system is constructed for the pump shaft. This greatly enhances the operational stability of the pump shaft within the guide vane assembly and effectively suppresses vibrations and radial runout that may occur during high-speed rotation of the pump shaft.

[0018] As a preferred embodiment of this utility model, the upper surface of the impeller is provided with an arc-shaped groove, and the inner wall of the arc-shaped groove smoothly transitions with the inner wall of the central cylinder.

[0019] To achieve the above technical solution, when the impeller rotates at high speed, the fluid gains energy under the action of the blades and flows upward. By setting an arc-shaped groove with a smooth transition at the junction of the upper surface of the impeller and the central cylinder, the fluid flow channel at the junction of the impeller and the central cylinder is optimized, reducing turbulence and hydraulic losses at this point, effectively suppressing cavitation, thereby improving hydraulic efficiency and extending the service life of the impeller and the central cylinder.

[0020] As a preferred embodiment of this utility model, the sealing tube includes a fixed tube and a receiving tube. The fixed tube is fixedly connected to the water outlet tube through the fixed plate, and the receiving tube is fixedly connected to the lower end of the fixed tube and is used to place the oil seal.

[0021] To achieve the above technical solution, the pump shaft passes through the center of the fixed tube and the receiving tube. The receiving tube, as a core functional component, has its internal space specifically designed to house sealing elements such as oil seals. These sealing elements form a tight dynamic seal with the outer wall of the rotating pump shaft. By designing the sealing tube as a combination of the fixed tube and the receiving tube, modularization and specialization of the sealing function are achieved.

[0022] As a preferred embodiment of this utility model, the outer wall of the fixing tube is integrally connected with a first extension ring arranged coaxially, the first extension ring being close to the lower end of the fixing tube. The outer wall of the receiving tube is integrally connected with a second extension ring arranged coaxially, the second extension ring being close to the upper end of the receiving tube. The first extension ring and the second extension ring are fixedly connected by bolts. A sealing groove is provided on the second extension ring, and an O-ring is embedded in the sealing groove. The upper surface of the O-ring abuts against the lower surface of the first extension ring.

[0023] To achieve the above technical solution, the sealing pipe is assembled and connected by bolts to fasten the first extension ring on the fixed pipe to the second extension ring on the receiving pipe. During the fastening process, the O-ring embedded in the sealing groove of the second extension ring undergoes elastic deformation due to the compression of the lower surface of the first extension ring, thereby tightly filling the joint gap between the two extension rings. Through the precise fit of the extension rings, bolts, and O-rings, a high-strength mechanical connection and a highly reliable static seal are provided. This ensures the robustness of the connection between the fixed pipe and the receiving pipe, completely eliminates the possibility of leakage at this connection, further enhances the integrity and sealing performance of the entire sealing system, and improves the overall safety and reliability level of the pump.

[0024] As a preferred embodiment of this utility model, the lower surface of the fixing tube is integrally connected with a coaxially arranged sealing ring, and the inner wall of the receiving tube is provided with a placement groove communicating with the sealing groove. The outer wall of the sealing ring abuts against the inner wall of the O-ring and the inner wall of the placement groove.

[0025] To achieve the above technical solution, after assembly, the sealing ring is integrally connected to the lower surface of the fixed pipe. Its outer wall forms a multi-point tight seal with the inner wall of the O-ring and the inner wall of the placement groove on the inner wall of the receiving pipe. This not only provides dual axial and radial positioning for the O-ring but also adds an extra sealing barrier. By adding a sealing ring and cooperating with the placement groove, a more complex and stable sealing interface is constructed. This greatly enhances the stability and sealing reliability of the O-ring, effectively preventing displacement or overturning of the O-ring under pressure fluctuations or vibrations, thereby significantly improving the durability and lifespan of the sealing structure and providing a higher level of protection for the long-term trouble-free operation of the pump. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the external structure of this utility model;

[0028] Figure 3 This is a cross-sectional schematic diagram of the present invention;

[0029] Figure 4 for Figure 3 Enlarged view of point A;

[0030] Figure 5 This is a schematic diagram of the exploded structure of this utility model;

[0031] Figure 6 This is a schematic diagram of the exploded structure of this utility model;

[0032] Figure 7 This is a schematic diagram illustrating the structure of the guide vane assembly.

[0033] Reference numerals: 1. Support frame; 2. Base plate; 3. Support ring; 4. Support column; 5. Upper connecting ring; 6. Lower connecting ring; 7. Reinforcing plate; 8. Filter ring; 9. Filter hole; 10. Through hole; 11. Guide vane assembly; 12. Central cylinder; 13. Pump casing; 14. Guide vane; 15. First gap; 16. Second gap; 17. Support rib; 18. Support pipe; 19. Arc groove; 20. Sealing pipe; 21. Fixing pipe; 22. Receiving pipe; 23. First extension ring; 24. Second extension ring; 25. Sealing groove; 26. O-ring; 27. Sealing ring; 28. Placement groove; 29. ​​Water outlet pipe; 30. Fixing plate; 31. Pump shaft; 32. Impeller; 33. Bearing; 34. Fixing bolt. Detailed Implementation

[0034] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0035] A flood control pump structure adapted for low-water-level pumping includes a pump shaft 31, an impeller 32, a guide vane assembly 11, a support frame 1, an outlet pipe 29, and a sealing pipe 20. The support frame 1, guide vane assembly 11, and outlet pipe 29 are arranged sequentially from bottom to top. The support frame is fixed to the lower end of the guide vane assembly 11, and the outlet pipe 29 is fixed to the upper end of the guide vane assembly 11. The outlet pipe 29 is L-shaped. The sealing pipe 20 passes through the outlet pipe 29 and is fixedly connected to the inner wall of the outlet pipe 29 via a fixing plate 30. The pump shaft 31 passes through the sealing pipe 20, the impeller 32 is fixed to the lower end of the pump shaft 31 and located inside the support frame 1, and the upper end of the pump shaft 31 is used to connect a motor.

[0036] The support frame 1 includes an integrated base plate 2, a support ring 3, and four support columns 4. The upper end of each support column 4 is fixedly connected to the lower surface of the support ring 3, and the lower end of each support column 4 is fixedly connected to the upper surface of the base plate 2. The four support columns 4 are evenly distributed along the axis of the support ring 3. The base plate 2 and the support ring 3 are coaxially arranged.

[0037] The upper edge of the support ring 3 extends outward to form an upper connecting ring 5 for connection with the guide vane assembly 11. The lower edge of the support ring 3 extends outward to form a lower connecting ring 6 for fixed connection with the support column 4. Both the upper connecting ring 5 and the lower connecting ring 6 are coaxially arranged with the support ring 3. A reinforcing plate 7 is fixedly connected between the upper connecting ring 5 and the lower connecting ring 6, and the sidewall of the reinforcing plate 7 is fixedly connected to the outer wall of the support ring 3. Multiple reinforcing plates 7 are evenly distributed along the axis of the support ring 3.

[0038] Multiple filter holes 9 are evenly distributed on the side wall of the filter ring 8, and four support columns 4 are located inside the filter ring 8. The filter ring 8 is fixed to the outer wall of the support columns 4 by fixing bolts 34, and the outer wall of the support columns 4 abuts against the inner wall of the filter ring 8. The upper surface of the filter ring 8 abuts against the lower surface of the lower connecting ring 6, and the lower surface of the filter ring 8 is flush with the lower surface of the base plate 2. Multiple through holes 10 are provided on the base plate 2.

[0039] The guide vane assembly 11 includes an integrally formed central cylinder 12, a pump casing 13, and multiple guide vanes 14. The lower end of the pump casing 13 is fixedly connected to the upper connecting ring 5 by bolts, and the upper end of the pump casing 13 is fixedly connected to the outlet pipe 29 by bolts. The pump casing 13 and the support ring 3 are coaxially arranged. The central cylinder 12 is located inside the pump casing 13 and is coaxially arranged. The two ends of the guide vanes 14 are fixedly connected to the outer wall of the central cylinder 12 and the inner wall of the pump casing 13, respectively, and the multiple guide vanes 14 are evenly distributed along the axis of the central cylinder 12.

[0040] The pump shaft 31 passes through the central cylinder 12 and is fixedly connected to the impeller 32, which is located below the central cylinder 12. There is a first gap 15 between the upper surface of the impeller 32 and the lower surface of the central cylinder 12, and a second gap 16 between the upper end of the central cylinder 12 and the outer wall of the pump shaft 31.

[0041] A support rib 17 is integrally connected to the inner wall of the central cylinder 12. The four support ribs 17 are evenly distributed along the axis of the central cylinder 12. The end of the support rib 17 away from the inner wall of the central cylinder 12 is fixedly connected to a support pipe 18. The pump shaft 31 passes through the support pipe 18 and is rotatably connected to the inner wall of the support pipe 18.

[0042] The upper surface of the impeller 32 is provided with a recessed arc-shaped groove 19, and the edge of the arc-shaped groove 19 smoothly transitions with the inner wall of the central cylinder 12.

[0043] The sealing pipe 20 includes a fixed pipe 21 and a receiving pipe 22. The fixed pipe 21 is fixedly connected to the outlet pipe 29 via a fixing plate 30, which is located on the side wall of the fixed pipe 21. The fixed pipe 21, the outlet pipe 29, and the fixing plate 30 are integrated into one unit. The receiving pipe 22 is fixedly connected to the lower end of the fixed pipe 21 by bolts and is used to house the oil seal. The pump shaft 31 passes through the fixed pipe 21 and is rotatably connected to the inner wall of the fixed pipe 21 via a bearing 33.

[0044] A first extension ring 23 is integrally connected to the outer wall of the fixing tube 21, and is coaxially arranged with the fixing tube 21. The first extension ring 23 is located near the lower end of the fixing tube 21. A second extension ring 24 is integrally connected to the outer wall of the receiving tube 22, and is coaxially arranged with the receiving tube 22. The second extension ring 24 is located near the upper end of the receiving tube 22.

[0045] The first extension ring 23 and the second extension ring 24 are fixedly connected by bolts. The second extension ring 24 has a coaxially arranged sealing groove 25, and an O-ring 26 is embedded in the sealing groove 25. The upper surface of the O-ring 26 abuts against the lower surface of the first extension ring 23.

[0046] A sealing ring 27 is integrally connected to the lower surface of the fixed tube 21 and is coaxially arranged. A placement groove 28 communicating with the sealing groove 25 is opened on the inner wall of the receiving tube 22. The outer wall of the sealing ring 27 abuts against the inner wall of the O-ring 26 and the inner wall of the placement groove 28.

[0047] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A flood control pump structure adapted for low-water-level pumping, comprising a pump shaft (31), an impeller (32), a guide vane assembly (11), a support frame (1), an outlet pipe (29), and a sealing pipe (20), characterized in that: The support frame (1) is fixed to the lower end of the guide vane assembly (11), the water outlet pipe (29) is fixed to the upper end of the guide vane assembly (11), the sealing pipe (20) passes through the water outlet pipe (29) and is fixedly connected to the inner wall of the water outlet pipe (29) through the fixing plate (30), the pump shaft (31) passes through the sealing pipe (20), the impeller (32) is fixed to the lower end of the pump shaft (31) and located inside the support frame (1), and the upper end of the pump shaft (31) is used to connect the motor.

2. The flood control pump structure adapted for low-water-level pumping according to claim 1, characterized in that: The support frame (1) includes a base plate (2), a support ring (3) and a plurality of support columns (4). The support columns (4) are fixed between the support ring (3) and the base plate (2), and the plurality of support columns (4) are evenly distributed along the axis of the support ring (3).

3. The flood control pump structure adapted for low-water-level pumping according to claim 2, characterized in that: The upper edge of the support ring (3) extends outward to form an upper connecting ring (5) for connecting with the guide vane assembly (11), and the lower edge of the support ring (3) extends outward to form a lower connecting ring (6) for fixed connection with the support column (4). A reinforcing plate (7) is fixedly connected between the upper connecting ring (5) and the lower connecting ring (6), and the side wall of the reinforcing plate (7) is fixedly connected to the outer wall of the support ring (3).

4. A flood control pump structure adapted for low-water-level pumping according to claim 3, characterized in that: It also includes a filter ring (8) that also serves as a support. The filter ring (8) has multiple filter holes (9). All the support columns (4) are located inside the filter ring (8). The filter ring (8) is fixed to the outer wall of the support column (4) by a fixing bolt (34). The upper surface of the filter ring (8) abuts against the lower surface of the lower connecting ring (6). The lower surface of the filter ring (8) is flush with the lower surface of the base plate (2). The base plate (2) has multiple through holes (10).

5. A flood control pump structure adapted for low-water-level pumping according to claim 2, characterized in that: The guide vane assembly (11) includes a central cylinder (12), a pump casing (13), and multiple guide vanes (14). The lower end of the pump casing (13) is fixedly connected to the upper connecting ring (5), and the upper end of the pump casing (13) is fixedly connected to the outlet pipe (29). The central cylinder (12) is located inside the pump casing (13) and is coaxially arranged. The two ends of the guide vanes (14) are fixedly connected to the outer wall of the central cylinder (12) and the inner wall of the pump casing (13), respectively. The multiple guide vanes (14) are evenly distributed along the axis of the central cylinder (12). The pump shaft (31) passes through the central cylinder (12) and is fixedly connected to the impeller (32). There is a first gap (15) between the upper surface of the impeller (32) and the lower surface of the central cylinder (12), and a second gap (16) between the upper end of the central cylinder (12) and the outer wall of the pump shaft (31).

6. A flood control pump structure adapted for low-water-level pumping according to claim 5, characterized in that: A support rib (17) is fixedly connected to the inner wall of the central cylinder (12). A plurality of the support ribs (17) are evenly distributed along the axis of the central cylinder (12). A support tube (18) is fixedly connected to one end of the support rib (17) away from the inner wall of the central cylinder (12). The pump shaft (31) passes through the support tube (18) and is rotatably connected to the inner wall of the support tube (18).

7. A flood control pump structure adapted for low-water-level pumping according to claim 5, characterized in that: The upper surface of the impeller (32) is provided with an arc-shaped groove (19), and the inner wall of the arc-shaped groove (19) and the inner wall of the central cylinder (12) are smoothly connected.

8. A flood control pump structure adapted for low-water-level pumping according to claim 1, characterized in that: The sealing tube (20) includes a fixed tube (21) and a receiving tube (22). The fixed tube (21) is fixedly connected to the water outlet tube (29) through the fixed plate (30). The receiving tube (22) is fixedly connected to the lower end of the fixed tube (21) and is used to place the oil seal.

9. A flood control pump structure adapted for low-water-level pumping according to claim 8, characterized in that: The outer wall of the fixed tube (21) is integrally connected with a first extension ring (23) arranged coaxially. The first extension ring (23) is close to the lower end of the fixed tube (21). The outer wall of the receiving tube (22) is integrally connected with a second extension ring (24) arranged coaxially. The second extension ring (24) is close to the upper end of the receiving tube (22). The first extension ring (23) and the second extension ring (24) are fixedly connected by bolts. The second extension ring (24) is provided with a sealing groove (25) arranged coaxially. An O-ring (26) is embedded in the sealing groove (25). The upper surface of the O-ring (26) abuts against the lower surface of the first extension ring (23).

10. A flood control pump structure adapted for low-water-level pumping according to claim 9, characterized in that: The lower surface of the fixed tube (21) is integrally connected with a sealing ring (27) arranged coaxially. The inner wall of the receiving tube (22) is provided with a placement groove (28) that communicates with the sealing groove (25). The outer wall of the sealing ring (27) abuts against the inner wall of the O-ring (26) and the inner wall of the placement groove (28).

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