Blade mounting structure of water pump impeller component

Abstract

The blade mounting structure of the water pump impeller component is high in blade mounting precision and mounting strength, small in running resistance, stable in water pump running and convenient to maintain and replace. The impeller comprises a pump shaft, the pump shaft is mounted at one end of a rotor body, a rotor body cover is mounted at the other end of the rotor body through a gland bolt, blades are mounted on the rotor body, mounting holes for mounting the blades are stepped holes, hubs are arranged at the bottoms of the blades, transition joints of the blades and the hubs are in an arc surface shape, and the rotor body cover is mounted at the other end of the rotor body. The hub is inserted into the blade mounting hole, the hub and the rotor body are in positioning connection through a positioning pin, the hub is T-shaped, a rod part of the T-shaped hub is sleeved with a blade pressing plate, the blade pressing plate covers the outer edge of the end part of the blade mounting hole, the blade pressing plate and the hub are connected through a draw-in bolt, and the blade pressing plate covers the outer edge of the end part of the blade mounting hole. The rotor assembly is characterized in that the draw-in bolt and the positioning pin are drilled from the inner side of the rotor body.

Description

Technical Field

[0001] The utility model relates to the technical field of large water pumps, in particular to a blade mounting structure of a water pump impeller component. Background Art

[0002] Large-diameter axial flow pumps and mixed flow pumps are suitable for pumping water or other liquids with physical and chemical properties similar to water. They are mainly used in large-scale water supply and drainage projects, long-distance water delivery, flood control and drainage, urban river water diversion, irrigation and other large-scale water conservancy projects. The impeller parts are divided into fixed blade structure and adjustable blade structure according to the blade installation method. The semi-adjustable blade structure is a type of adjustable blade structure, which is mostly used in the field of large-diameter axial flow pumps and mixed flow pumps.

[0003] The blade mounting structure of the impeller components commonly used in existing large-diameter axial flow pumps and mixed flow pumps is as follows: Figure 1 , Figure 2 As shown, a semi-adjustable blade mounting structure includes a pump shaft 11, the pump shaft 11 is connected to one end of a rotor body 2 through a connecting bolt and a torque transmission cross pin, the other end of the rotor body 2 is mounted on the rotor body through a gland bolt, the rotor body 2 is mounted with a blade 5 through a blade mounting hole 7, the blade 5 is twisted, the blade mounting hole 7 is stepped, the blade mounting hole 7 includes a first hole section close to the outer side of the rotor body 2 and a second hole section close to the inner side of the rotor body 2, a hub 6 is provided at the bottom of the blade 5, the transition connection 14 between the blade 5 and the hub 6 is rounded, the hub 6 is inserted into the blade mounting hole 7, the hub 6 includes a first column section close to one end of the blade 5 and a second column section away from one end of the blade 5, The diameter of the first column section is greater than the diameter of the second column section, the first hole section matches the shape of the first column section, and there is a gap between the second hole section and the second column section; the second column section extends into the inner cavity of the rotor body 2 through the blade pressure plate 13, and the blade pressure plate 13 is pressed against the hole opening of the blade mounting hole on the inner side of the rotor body 2, and the blade pressure plate 13 is connected to the first column section through a tightening bolt 9 and a locating pin 10, and the tightening bolt 9 passes through the gap between the second hole section and the second column section, and the locating pin 10 passes through the hole wall of the second hole section; the tightening bolt 9 and the locating pin 10 are drilled from the outside of the rotor body 2, and the drilled hole on the surface of the hub 6 is filled with a lead block or a resin material 11.

[0004] The stress conditions of the blade mounting structure of the impeller components commonly used in existing large-diameter axial flow pumps and mixed flow pumps are as follows: Figure 3 As shown, it can be seen from the force analysis diagram that the drilled holes on the hub 6 are subjected to large alternating stress, which causes fatigue fracture at the transition connection between the blade 5 and the hub 6, and generates large resistance when water flows over the surface of the hub 6.

[0005] This blade installation structure is limited by the hydraulic model of the blade. When drilling the tension bolts and locating pins from the outside, the blades must be avoided, so that the position and number of the tension bolts and locating pins cannot be arranged most reasonably according to the force conditions of the blades. The tension bolts can only use small hexagon socket bolts, which are easy to slip and the tightening torque is insufficient, resulting in low installation accuracy and installation strength of the blades. In order to reserve installation space for the tension bolts and locating pins, the fillet at the transition between the blade and the hub is small, which makes the transition between the blade and the hub prone to fatigue fracture. The tension bolts and locating pins are drilled from the outside of the rotor body, and the holes on the surface of the hub need to be filled with lead blocks or resin materials, resulting in pits on the surface of the hub. When the water flows through the surface of the hub during operation, it will generate greater resistance. During maintenance, it is necessary to dig out the lead blocks or resins that fill the holes in the hub first, making maintenance and replacement very difficult. There is a gap at the connection between the rotor body, the water pump and the blades, and water is easy to enter the impeller, which makes the impeller rotor rotation balance worse, and the water pump is prone to vibration during operation, and the water pump is unstable. Summary of the invention

[0006] In view of the shortcomings of the existing blade mounting structure of the impeller component of the water pump, such as low mounting accuracy and mounting strength, easy fatigue fracture at the transition between the blade and the hub, large resistance during operation, easy water ingress into the rotor body resulting in unstable operation, and difficult maintenance and replacement, the utility model provides a blade mounting structure for the impeller component of the water pump, which has high blade mounting accuracy and mounting strength, is not easy to fatigue fracture at the transition between the blade and the hub, has small resistance during operation, water will not infiltrate the rotor body, the water pump runs stably, and is easy to maintain and replace.

[0007] A blade mounting structure of a water pump impeller component, which includes a pump shaft, wherein the pump shaft is mounted on one end of a rotor body, and the other end of the rotor body is mounted on a rotor body cover by a pressure cover bolt, and blades are mounted on the rotor body. The mounting holes for mounting the blades are stepped holes, and a hub is provided at the bottom of the blades. The transition connection between the blades and the hub is an arc surface, and the hub is inserted into the blade mounting hole. The hub and the rotor body are positioned and connected by a locating pin, and the hub is T-shaped. The stem of the T-shaped hub is provided with a blade pressure plate, and the blade pressure plate covers the outer edge of the end of the blade mounting hole. The blade pressure plate and the hub are connected by a tensioning bolt, characterized in that the tensioning bolt and the locating pin are drilled from the inner side of the rotor body.

[0008] It is further characterized by:

[0009] The connection between the pump shaft and the rotor body, the connection between the rotor body and the rotor body cover, and the contact surface between the wheel hub and the rotor body are all coated with sealant.

[0010] In the above structure of the utility model, the tension bolts and the positioning pins are drilled from the inner side of the rotor body. The tension bolts and the positioning pins do not occupy the outer space, and there is no need to avoid the blades. The positions and numbers of the tension bolts and the positioning pins can be determined according to the force requirements of the blades, thereby improving the installation accuracy and installation strength of the blades. The tension bolts can use larger hexagonal bolts to further improve the installation strength of the blades. The outer space is saved, so that the fillet of the connection between the blades and the hub can also be increased, so that the connection between the blades and the hub is not easy to fatigue and fracture. There will be no drilling holes on the outer surface of the hub, and there is no need to fill it with lead blocks or resin materials, which ensures that the streamlines on the surface of the impeller components are not destroyed, reduces the running resistance, and saves the steps of digging and filling during maintenance and replacement, simplifying the maintenance and replacement steps. The connection between the pump shaft and the rotor body, the connection between the rotor body and the rotor body cover, and the contact surface between the hub and the rotor body are all coated with sealant, so that the rotor body will not be infiltrated with water, ensuring the balance of the impeller components and ensuring the stable operation of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the main view of the prior art;

[0012] Figure 2 It is a schematic diagram of a blade and a hub viewed from above in the prior art;

[0013] Figure 3 It is a force analysis diagram of the prior art;

[0014] Figure 4 It is a structural schematic diagram of the main view of the utility model;

[0015] Figure 5 It is a schematic diagram of the blade and the hub of the utility model viewed from above;

[0016] Figure 6 This is a force analysis diagram of the utility model. DETAILED DESCRIPTION

[0017] See Figure 4 , Figure 5 A blade mounting structure of a water pump impeller component includes a pump shaft, a pump shaft 1 is mounted on one end of a rotor body 2, a rotor body cover 13 is mounted on the other end of the rotor body 2 through a gland bolt 12, and a blade 5 is mounted on the rotor body 2. Figure 4The number of blades 5 installed in the middle rotor body 2 is three. The mounting hole for installing the blade 5 is a stepped hole. A hub 6 is provided at the bottom of the blade 5. The transition connection between the blade 5 and the hub 6 is an arc surface. The hub 6 is inserted into the blade mounting hole 7. The hub 6 and the rotor body 2 are positioned and connected by a locating pin 10. The hub 6 is T-shaped. The stem of the T-shaped hub 6 is provided with a blade pressure plate 8. The blade pressure plate 8 covers the outer edge of the end of the blade mounting hole 7. The blade pressure plate 8 and the hub 6 are connected by a tensioning bolt 9. The tensioning bolt 9 and the locating pin 10 are drilled from the inside of the rotor body. The tensioning bolt 9 and the locating pin 10 do not occupy the outer space, and there is no need to avoid the blade 5. The position and number of the tensioning bolt 9 and the locating pin 10 can be determined according to the force requirements of the blade 5. Figure 4 There are six tension bolts 9 and five positioning pins 10 in the middle, which improve the installation accuracy and installation strength of the blade 5; the tension bolts 9 can use larger hexagonal bolts to further improve the installation strength of the blade 5; the fillet of the transition connection 14 between the blade 5 and the hub 6 can also be increased, so that the connection between the blade 5 and the hub 6 is not easy to fatigue and fracture. There will be no drilling holes on the outer surface of the hub 6, and it is not necessary to fill it with lead blocks or resin materials, ensuring that the streamlines on the surface of the impeller components are not damaged, reducing the running resistance, and eliminating the steps of digging and filling during maintenance and replacement, simplifying the maintenance and replacement steps.

[0018] The force of the utility model is as follows Figure 6 As shown, it can be seen from the force analysis diagram that the surface of the hub 6 and the transition connection 14 are subjected to the whole force, and the transition connection 14 is subject to less resistance when water flows through the surface of the hub 6. The tension bolts 9 and the positioning pins 10 are arranged at positions with greater force, so that the root of the blade 5 is not prone to fatigue fracture.

[0019] During installation, the staff first sets the tension bolts 9 and the positioning pins 10 from the inner side of the rotor body 2 according to the specific stress conditions, and then installs the rotor body cover 13.

[0020] The connection between the pump shaft 1 and the rotor body 2, the connection between the rotor body 2 and the rotor body cover 13, and the contact surface between the hub 6 and the rotor body 2 are all coated with sealant 15. In this embodiment, KE-45 sealant is used to prevent water from entering the rotor body 2, ensure the balance of the impeller components, and ensure stable operation of the water pump.

Claims

1. A blade mounting structure of a water pump impeller component, comprising a pump shaft, the pump shaft is mounted on one end of a rotor body, the other end of the rotor body is mounted on a rotor body cover by a gland bolt, the blade is mounted on the rotor body, the mounting hole for mounting the blade is a stepped hole, a hub is provided at the bottom of the blade, the transition connection between the blade and the hub is an arc surface, the hub is inserted into the blade mounting hole, the hub and the rotor body are positioned and connected by a locating pin, the hub is T-shaped, the stem of the T-shaped hub is sleeved with a blade pressure plate, the blade pressure plate covers the outer edge of the end of the blade mounting hole, the blade pressure plate and the hub are connected by a tensioning bolt, characterized in that: The tension bolts and the positioning pins are drilled into the inner side of the rotor body.

2. The blade mounting structure of a water pump impeller component according to claim 1, characterized in that: The connection between the pump shaft and the rotor body, the connection between the rotor body and the rotor body cover, and the contact surface between the wheel hub and the rotor body are all coated with sealant.

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