A submersible axial flow pump inlet bell with both bottom coupling installation and anti-cavitation capacity

Abstract

This utility model discloses a submersible axial flow pump inlet horn that combines bottom-coupled installation and cavitation resistance, relating to the field of submersible axial flow pump improvement. It includes an inlet horn with an expanded hollow cylinder, flanges at both ends, and stainless steel wear-resistant rings fitted to the inner wall, the length of which covers the impeller blades. The mounting flange is fixed to the guide vane body with a stepped annular protrusion, and an even number of reinforcing ribs are provided between the flanges. A vertical protrusion is provided on the outer side of the inlet end. During operation, the horn-shaped structure guides the water flow smoothly in, the wear-resistant rings resist cavitation, and the reinforcing ribs and protrusions enhance the installation rigidity and stability, achieving efficient axial propulsion of the water flow. Compared with existing technologies, this design shortens installation and disassembly time, reduces stress values, reduces noise by 10-15 decibels, is compatible with multiple pump models, and reduces carbon emissions, combining installation convenience with environmental and energy-saving advantages.

Description

Technical Field

[0001] This utility model relates to the field of submersible axial flow pump improvement, specifically a submersible axial flow pump inlet horn that combines bottom coupling installation and anti-cavitation capability. Background Technology

[0002] Submersible axial flow pumps are water pumps with large single-unit flow rates and low head. They are commonly used in municipal and public works projects such as flood drainage, irrigation, water lifting in waterworks, and water lifting in sewage treatment plants. Ensuring their long-term reliable operation is crucial.

[0003] The inlet of an axial flow pump is the transition section between the inlet tank and the impeller chamber inlet. Its main function is to provide a uniform velocity distribution at the impeller chamber inlet, reducing hydraulic losses at the inlet. Before the fluid enters the impeller through the pipeline, adverse hydraulic phenomena such as pre-swirl, vortices, uneven flow velocity, low inlet tank liquid level, and poor inlet conditions may cause air bubbles to be entrained in the pump. These free air bubbles grow in the liquid and collapse under high pressure, causing water hammer on the side wall of the inlet inlet, also known as cavitation, which can damage or even break off the inlet inlet.

[0004] The traditional installation method for submersible axial flow pumps in China generally relies on the coupling slope of the guide vane body of the submersible axial flow pump and the coupling slope of the matching well support to achieve coupling installation. However, due to machining errors in the slope angle or improper pump hoisting, the pump often cannot be fully positioned, resulting in large vibrations and noise during pump operation. Over time, this can even lead to damage to pump components.

[0005] To address the aforementioned issues, there is an urgent need to develop a submersible axial flow pump inlet horn that combines bottom-coupled installation with cavitation resistance. Utility Model Content

[0006] The purpose of this utility model is to provide a submersible axial flow pump inlet horn that combines bottom coupling installation and anti-cavitation capability. The inlet horn guides the water flow smoothly through its outward-expanding horn-shaped structure to reduce resistance. The flanges at both ends are combined with the stepped annular protrusions of the guide vane body for secure installation. The reinforcing ribs and protrusions enhance rigidity, while the stainless steel wear-resistant ring on the inner wall resists water flow impact and cavitation by covering the length of the impeller blades. Together with the impeller, it propels the water flow axially, ensuring the pump operates efficiently and stably.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A submersible axial flow pump inlet horn that combines bottom coupling installation and cavitation resistance includes an inlet horn-shaped inlet horn installed on the outside of a guide vane body. An impeller is connected inside the guide vane body via a motor shaft. The inlet horn is characterized by being an outwardly expanding hollow cylinder with flanges at both its mounting end and inlet end. A wear-resistant ring is fitted onto the inner wall of the inlet horn.

[0009] The wear-resistant ring is installed on the outside of the impeller, and the length of the wear-resistant ring is greater than or equal to the length of the impeller blade.

[0010] The wear-resistant ring is made of stainless steel.

[0011] A reinforcing rib is provided between the water inlet horn mounting end and the water inlet flange. The reinforcing rib has a protrusion near the water inlet end, and the top surface of the protrusion is perpendicular to the ground.

[0012] The reinforcing ribs are two or more, and the number is even.

[0013] The water inlet horn is installed on the outside of the guide vane body via the mounting end flange and is fixed with bolts. A stepped annular protrusion is provided at the connection between the outside of the guide vane body and the mounting end flange.

[0014] When the submersible axial flow pump starts, water flows into the pump body through the inlet horn. The inlet horn has an outward-expanding hollow cylindrical structure, and its horn-shaped design guides the water flow smoothly and evenly, reducing water flow resistance and energy loss. The flange structure at the mounting end and the inlet end ensures that the inlet horn is firmly installed on the outside of the guide vane body. The stepped annular protrusion ensures precise positioning and tight connection, while the reinforcing ribs and protrusions further enhance the overall rigidity, ensuring the stability of the bottom coupling installation and withstanding the impact of water flow and the vibration generated by the pump body operation.

[0015] As water flows in, the wear-resistant ring fitting against the inner wall plays a crucial role. Made of stainless steel and extending to cover the impeller blades, it effectively resists the high-speed impact of the water flow and cavitation damage. Cavitation occurs when changes in fluid pressure cause air bubbles to burst. The wear-resistant ring, with its high hardness and corrosion resistance, reduces the erosion of the inlet horn's inner wall by these bursting bubbles, extending the component's service life. Driven by the motor shaft, the impeller rotates at high speed, propelling the water axially. The cooperation between the wear-resistant ring and the impeller ensures smooth water flow, maintaining the pump's efficient operation.

[0016] The reinforcing ribs and protrusions provide structural support for stable operation. The even-numbered reinforcing ribs enhance the connection strength between flanges, while the protrusions, in conjunction with the bottom coupling device, enable rapid positioning and precise installation. When subjected to the force of water flow, they disperse stress, preventing deformation or damage to the inlet horn due to uneven stress, thus ensuring the stable and reliable operation of the entire submersible axial flow pump system.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] Modular installation advantages: The flanges at both ends and the reinforcing ribs enable modular installation. Compared with welding or integrated structures, the installation and disassembly time is shortened, which facilitates quick maintenance and replacement and improves the efficiency of engineering operations.

[0019] Stress dispersion design: The even-numbered symmetrical distribution of stiffeners and the structure at protrusions effectively disperse stress concentration during operation. Finite element analysis reduces stress values ​​in critical parts, avoiding structural fatigue and deformation caused by long-term stress.

[0020] Improved noise control: The optimized structure reduces water flow disturbance and component vibration, resulting in a 10-15 decibel reduction in operating noise compared to traditional designs, meeting the needs of noise-sensitive application scenarios.

[0021] Enhanced adaptability: The stepped annular protrusions can form a standardized fit with guide vanes of different specifications, improving versatility and compatibility with various models of submersible axial flow pumps, reducing customization costs and development cycles.

[0022] Environmentally friendly and energy-saving: Improved operating efficiency reduces energy consumption, and the anti-cavitation design reduces maintenance frequency. Overall carbon emissions are lower than similar products, which is in line with the concept of green environmental protection.

[0023] The inlet flange of the inlet horn is designed with coupling, allowing the water pump to be directly coupled and installed with the matching well accessories through the inlet flange of the inlet horn, which improves the stability of the water pump operation and the convenience of installation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a submersible axial flow pump with a bottom-coupled installation and anti-cavitation capability, based on the present invention.

[0025] Figure 2 This is a schematic diagram of a submersible axial flow pump with bottom coupling installation and anti-cavitation capability, using a horn-coupled partial installation method.

[0026] In the diagram: 1. Inlet horn; 2. Guide vane; 3. Impeller; 4. Wear-resistant ring; 11. Reinforcing rib; 12. Protrusion; 21. Stepped annular protrusion. Detailed Implementation

[0027] The technical solutions of the present invention will now be described in full with reference to the accompanying drawings of the embodiments.

[0028] like Figure 1-2 As shown, a submersible axial flow pump inlet horn with both bottom coupling installation and anti-cavitation capability includes an inlet horn 1 in the shape of a horn installed on the outside of a guide vane body 2. An impeller 3 is connected inside the guide vane body 2 through a motor shaft. The inlet horn 1 is characterized by being an outwardly expanding hollow cylinder with flanges at both its mounting end and inlet end. A wear-resistant ring 4 is fitted onto the inner wall of the inlet horn 1.

[0029] The wear-resistant ring 4 is installed on the outside of the impeller 3, and the length of the wear-resistant ring 4 is greater than or equal to the length of the impeller 3 blades.

[0030] The wear-resistant ring 4 is made of stainless steel.

[0031] A reinforcing rib 11 is provided between the mounting end of the water inlet horn 1 and the flange of the water inlet end. The reinforcing rib 11 has a protrusion 12 near the water inlet end, and the top surface of the protrusion 12 is perpendicular to the ground.

[0032] The number of reinforcing ribs 11 is two or more, and is an even number.

[0033] The water inlet horn 1 is installed on the outside of the guide vane body 2 via the mounting end flange and is fixed with bolts. A stepped annular protrusion 21 is provided at the connection between the outside of the guide vane body 2 and the mounting end flange.

[0034] In practice, the stainless steel wear ring 4 is first installed tightly onto the inner wall of the inlet horn 1 by welding or interference fit, ensuring that the length of the wear ring completely covers the blade range of the impeller 3 to effectively resist water flow impact and cavitation. Subsequently, the flange at the mounting end of the inlet horn 1 and the stepped annular protrusion 21 on the outer side of the guide vane body 2 are precisely positioned and fixed together with high-strength bolts to form a stable connection structure, ensuring that no relative displacement occurs during operation.

[0035] In the setting of reinforcing ribs 11 and protrusions 12, according to the size and load-bearing requirements of the water inlet horn, an even number of reinforcing ribs are symmetrically welded between the installation end and the water inlet flange. At the same time, a vertically downward protrusion is machined on the reinforcing rib near the water inlet end so that it can accurately match the groove of the bottom coupling device, so as to achieve quick installation and reliable fixation.

[0036] During operation, the inlet horn of the outward-expanding hollow cylinder guides the water flow smoothly inward. Its special curvature design reduces water turbulence and impact losses. The impeller 3 rotates under the drive of the motor shaft, and the water flows into the impeller through the wear-resistant ring protection area. The wear-resistant ring effectively reduces cavitation damage to the inner wall of the inlet horn. The reinforcing ribs and raised structures continuously disperse operating stress, reduce vibration and noise, and ensure stable and efficient operation of the entire pump body. At the same time, it is compatible with guide vanes of different specifications to meet the needs of diverse application scenarios.

Claims

1. A submersible axial flow pump inlet horn that combines bottom coupling installation and cavitation resistance, comprising an inlet horn (1) in the shape of a horn mounted on the outside of a guide vane body (2), wherein an impeller (3) is connected inside the guide vane body (2) via a motor shaft, characterized in that, The water inlet horn (1) is an outwardly expanded hollow cylinder, with flanges provided at both the mounting end and the water inlet end. A wear-resistant ring (4) is fitted onto the inner wall of the water inlet horn (1).

2. The submersible axial flow pump inlet horn with both bottom coupling installation and cavitation resistance as described in claim 1, characterized in that, The wear-resistant ring (4) is installed on the outside of the impeller (3), and the length of the wear-resistant ring (4) is greater than or equal to the length of the impeller (3) blade.

3. The bottom coupling and anti-cavitation combined submersible axial flow pump inlet bellmouth according to claim 1, characterized in that, The wear-resistant ring (4) is made of stainless steel.

4. The bottom coupling and anti-cavitation combined submersible axial flow pump inlet bellmouth according to claim 1, characterized in that, A reinforcing rib (11) is provided between the mounting end of the water inlet horn (1) and the flange of the water inlet end. A protrusion (12) is provided on the reinforcing rib (11) near the water inlet end. The top surface of the protrusion (12) is perpendicular to the ground.

5. The bottom coupling and anti-cavitation combined submersible axial flow pump inlet bellmouth according to claim 4, characterized in that, The number of reinforcing ribs (11) is two or more, and is even.

6. The bottom coupling and anti-cavitation combined submersible axial flow pump inlet bellmouth according to claim 1, characterized in that, The water inlet horn (1) is installed on the outside of the guide vane body (2) through the mounting end flange and fixed by bolts. A stepped annular protrusion (21) is provided at the connection between the outside of the guide vane body (2) and the mounting end flange.

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