Submersible pump provided with water suction cylinder structure

Abstract

The utility model relates to the technical field of water pump equipment, in particular to a submersible pump provided with a water suction cylinder structure. The water pump comprises a pump body, a water inlet section and a motor which are sequentially connected from top to bottom, the periphery of the water inlet section and the periphery of the motor are sleeved with a water suction barrel with the bottom open, the interior of the water suction barrel is divided into an inlet section, a transition section, an acceleration section and a stable section from bottom to top, the inlet section adopts the maximum constant inner diameter to guide water flow, and the transition section linearly contracts to accelerate the water flow and form a negative pressure area; the acceleration section maintains the minimum inner diameter to maximize the flow speed, a diffusion structure of the stable section restrains turbulent flow and converts kinetic energy into pressure energy, guide vanes are arranged in the barrel in a segmented mode, the angles of the vanes from the inlet section to the acceleration section are increased progressively, the density is increased to strengthen flow guiding, the density of the vanes of the stable section is minimum, the angles are decreased progressively, and pressure distribution is balanced. Through the synergistic effect of the segmented reducing structure and the dynamic guide vanes, the suction capacity under the low-water-level working condition is enhanced, and energy loss and equipment abrasion are reduced.

Description

Technical Field

[0001] This utility model relates to the field of water pump equipment technology, and more specifically, to a submersible pump equipped with a suction cylinder structure. Background Technology

[0002] Submersible pumps, as widely used hydraulic machinery, play a vital role in drainage and water supply systems in industry, agriculture, and daily life. Traditional submersible pump designs primarily focus on improving motor efficiency and optimizing impeller structure to enhance overall pump performance and durability. However, with the diversification of application environments and technological advancements, higher demands are being placed on submersible pumps, particularly in achieving efficient and stable pumping operations under low water levels.

[0003] Despite significant advancements in submersible pump technology, certain challenges remain when handling deep or low-level water sources. Specifically, traditional submersible pumps struggle to create an effective negative pressure zone in insufficient water depth, leading to decreased pumping efficiency or even malfunction. Furthermore, turbulence and energy loss during water flow into the pump body not only affect its suction capacity but can also accelerate wear and tear, shortening its lifespan. Utility Model Content

[0004] The purpose of this invention is to provide a submersible pump equipped with a suction cylinder structure to solve the problems of traditional submersible pumps having difficulty forming an effective negative pressure zone under low water level conditions and being prone to turbulence and energy loss during water intake.

[0005] To achieve the above objectives, a submersible pump with a suction cylinder structure is provided, comprising a pump body, an inlet section, and a motor fixedly connected from top to bottom. An outlet is provided at the top of the pump body, and a suction cylinder with a bottom opening is fitted around the inlet section and the motor.

[0006] The top end of the suction cylinder is fixedly connected to the bottom end of the pump body, and the bottom end of the suction cylinder extends to the bottom of the motor;

[0007] The inner cavity of the water suction cylinder is connected to the water inlet section. The negative pressure causes the water to flow from the bottom of the water suction cylinder to the top of the water suction cylinder and enter the water inlet section.

[0008] The inside of the water suction cylinder is arranged from bottom to top as an inlet section, a transition section, an acceleration section, and a stabilization section.

[0009] Furthermore, the inner diameter of the inlet section is constant and is the maximum value of all sections, used to guide the water flow in;

[0010] The inner diameter of the transition section decreases linearly from the inlet section to the acceleration section, which is used to accelerate the water flow.

[0011] The inner diameter of the acceleration section is constant and is the minimum value of all sections, used to maintain the maximum flow rate;

[0012] The stabilizing section increases continuously in the inner radial direction to suppress turbulence.

[0013] In the above technical solution, the inlet section adopts a constant maximum inner diameter, and the initial water flow velocity is reduced by increasing the cross-sectional area of ​​the flow.

[0014] The inner diameter of the transition section decreases linearly from the inlet section to the acceleration section. As the cross-sectional area of ​​the water flow decreases, it is forcibly accelerated. At the same time, the static pressure decreases due to the increase in flow velocity, forming a negative pressure suction force.

[0015] The acceleration section maintains a constant minimum inner diameter, and the water flow velocity reaches its peak by limiting the cross-sectional area. At this point, the kinetic energy is maximized, further enhancing the negative pressure suction effect.

[0016] The inner diameter of the stabilizing section gradually increases from the acceleration section to the pump inlet. Through the diffusion effect, part of the kinetic energy of the water flow is converted into pressure energy, which promotes the transition from turbulent flow to laminar flow, suppresses the generation of eddies and energy dissipation, and allows the water flow to enter the inlet section quickly and smoothly.

[0017] In another technical solution, the inner wall of the water suction cylinder is fixedly provided with multiple guide vanes, wherein:

[0018] The inclination angle of the guide vanes increases gradually from the inlet section to the acceleration section along the water flow direction;

[0019] The number of guide vanes increases progressively from the inlet section to the acceleration section along the water flow direction.

[0020] Based on this, the number of guide vanes in the stabilizing section is the minimum among all sections, in order to reduce water flow resistance;

[0021] The tilt angle of the guide vanes in the stabilizing section gradually decreases along the water flow direction to balance pressure distribution and suppress turbulence.

[0022] In this technical solution, the water flow path and pressure distribution are optimized through segmented guide vane design;

[0023] Within the section from the inlet to the acceleration section, the tilt angle of the guide vanes gradually increases along the direction of water flow. The inlet section uses a low angle to guide the water flow to enter smoothly, the transition section gradually increases the angle to enhance the guiding strength, and the acceleration section forces the water flow to maintain linear flow with the maximum tilt angle.

[0024] Meanwhile, the number of guide vanes increases gradually in the same direction. The vane layout in the inlet section is relatively sparse to reduce the initial flow resistance, while the vane density gradually increases in the transition and acceleration sections to suppress the lateral diffusion of high-speed water flow.

[0025] For the stable section, the number of guide vanes is set to the minimum for each section. By reducing the vane density, the water flow resistance is reduced and moderate diffusion is allowed. The tilt angle gradually decreases along the water flow direction, thereby balancing the axial and radial pressure distribution and suppressing turbulent energy dissipation.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] This submersible pump, equipped with a suction cylinder structure, utilizes a segmented internal design. The inlet section expands the cross-sectional area to reduce water flow velocity, the transition section linearly contracts to forcefully accelerate the water flow and create a negative pressure zone, the acceleration section maintains the minimum inner diameter to maximize flow velocity, and the stabilizing section's diffusion structure converts kinetic energy into pressure energy. Combined with different guide vanes designed for each section, a continuous process of water flow acceleration and pressurization is formed. At the same time, the gradient change in cross-sectional area between the transition and acceleration sections leads to a continuous decrease in static pressure, creating a stable negative pressure zone at the bottom of the suction cylinder. This effectively enhances the pumping capacity for deep water, making it particularly suitable for low water level conditions. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the internal segmented structure of the water suction cylinder of this utility model.

[0030] The meanings of the labels in the diagram are as follows:

[0031] 1. Motor; 2. Inlet section; 3. Pump body; 4. Outlet; 5. Suction cylinder; 6. Guide vanes; 7. Inlet section; 8. Transition section; 9. Acceleration section; 10. Stabilization section. Detailed Implementation

[0032] 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.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component 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 utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] Please see Figure 1 As shown, the purpose of this embodiment is to provide a submersible pump equipped with a suction cylinder structure, including a pump body 3, an inlet section 2, and a motor 1, which are fixedly connected from top to bottom. The pump body 3 has an outlet 4 at its top for discharging pressurized water to an external pipe. A suction cylinder 5 with an open bottom is fitted around the inlet section 2 and the motor 1. The top end of the suction cylinder 5 is fixedly connected to the bottom end of the pump body 3, and the bottom end extends downwards to below the motor 1, forming a cylindrical structure surrounding the inlet section 2 and the motor 1. The inner cavity of the suction cylinder 5 communicates with the inlet section 2. The negative pressure generated by the pump body 3 during operation draws water in from the bottom opening of the suction cylinder 5, and transports it upwards along the inside of the cylinder to the inlet section 2, finally entering the pump body 3 for pressurization.

[0036] like Figure 2As shown, the internal structure of the suction cylinder 5 is divided into four sections, from bottom to top: inlet section 7, transition section 8, acceleration section 9, and stabilization section 10. Inlet section 7 is located at the bottom of suction cylinder 5, with a constant inner diameter of 200mm, the maximum value for all sections. By increasing the cross-sectional area, it reduces the initial velocity of the water flow, guiding the water flow smoothly into the cylinder. The inner diameter of transition section 8 decreases linearly from 200mm in inlet section 7 to 180mm in acceleration section 9, with a cross-sectional area contraction rate of 10%. As the water flows through the gradually narrowing channel, it is forcibly accelerated, and the increased flow velocity leads to a decrease in static pressure, thus forming a stable negative pressure zone at the bottom of suction cylinder 5, enhancing the suction capacity under low water levels. Acceleration section 9 has a constant inner diameter of 180mm. By limiting the cross-sectional area, it maximizes the kinetic energy of the water flow and further strengthens the negative pressure effect. The inner diameter of the stabilizing section 10 increases continuously from 180mm in the acceleration section 9 to 190mm. The diffusion angle is designed to be 5°. Through the diffusion effect, part of the kinetic energy of the high-speed water flow is converted into pressure energy, while suppressing the generation of turbulence and promoting a smooth transition of the water flow to the inlet section 2, thus reducing energy loss.

[0037] Multiple sets of guide vanes 6 are fixedly installed on the inner wall of the suction cylinder 5. Their angle, length, and distribution density are dynamically adjusted according to the segmented function. The inlet section 7 has three guide vanes 6, each with a 20° inclination angle and an 80mm length, evenly distributed along the circumference. The low inclination angle and sparse distribution design reduce the initial resistance of the water flow and guides the water flow into the transition section 8 in a laminar flow state. The transition section 8 is equipped with four guide vanes 6, with the inclination angle linearly increasing from 20° in the inlet section 7 to 50°, and the vane length decreasing from 80mm to 60mm. This synergistic design of increasing inclination angle and decreasing vane length enhances the water flow guiding strength, ensuring stable flow during acceleration and preventing lateral diffusion. The acceleration section 9 has six guide vanes 6, with a fixed 55° inclination angle and a vane length of 54mm. The maximum inclination angle and dense arrangement force the water flow to maintain linear flow, reducing lateral kinetic energy loss and increasing negative pressure intensity. The stabilizing section 10 has only two guide vanes 6, with the inclination angle decreasing from 55° to 25° and the vane length being 48mm. The reduced vane density reduces the water flow resistance by 12%, allowing for moderate water flow diffusion, while balancing the axial and radial pressure gradients, suppressing turbulence and stabilizing the pressure output.

[0038] The synergistic effect of the segmented variable diameter structure and the dynamic guide vanes 6 creates a continuous process of water flow acceleration, pressurization, and stabilization. The low-speed guidance of the inlet section 7, the forced acceleration of the transition section 8, the maximization of flow velocity in the acceleration section 9, and the kinetic energy conversion in the stabilization section 10 collectively optimize the water flow path and pressure distribution. Especially under low water level conditions, the negative pressure zone at the bottom of the suction cylinder 5 improves suction efficiency, while the diffusion design of the stabilization section 10 reduces the impact of turbulence on the internal components of the equipment, lowering the risk of wear. Furthermore, the gradient design of the guide vanes 6 further enhances the water flow control capability, ensuring the efficient and stable operation of the submersible pump under complex conditions.

[0039] Working principle: Water enters through the bottom opening of the suction cylinder 5 and first flows through the inlet section 7. This section reduces the initial velocity of the water flow by increasing the cross-sectional area, guiding the water flow into the cylinder in a stable state and reducing turbulent disturbance. The guide vanes 6 are evenly distributed at a low angle to help the water flow form a laminar flow state, providing a stable flow basis for the subsequent acceleration stage.

[0040] Subsequently, the water flows into transition section 8. The inner diameter of this section contracts linearly along the flow direction, and the cross-sectional area gradually decreases, forcing the water to accelerate. According to fluid dynamics principles, the increased flow velocity leads to a decrease in static pressure, creating a negative pressure zone at the bottom of the suction cylinder 5. This enhances the suction capacity for low-level water sources. The inclination angle of the guide vanes 6 gradually increases as the inner diameter decreases, strengthening the constraint on the water flow, suppressing lateral diffusion, and ensuring a smooth and controllable acceleration process.

[0041] When the water reaches the acceleration section 9, the inner diameter becomes constant to its minimum value, and the flow velocity reaches its peak. During this stage, the kinetic energy of the water is maximized by maintaining the minimum cross-sectional area, while the negative pressure effect is continuously strengthened to further improve the suction efficiency. The guide vanes 6 are densely arranged at the maximum inclination angle to force the water to maintain a linear flow direction and avoid energy loss.

[0042] Finally, the water flows into the stabilization section 10. This section gradually expands radially upwards, forming a diffusion structure, and the flow velocity decreases accordingly. According to the principle of energy conservation, some kinetic energy is converted into pressure energy, causing the water pressure to gradually recover. The density of the guide vanes 6 decreases and their inclination angle decreases, reducing the constraint on the water flow, allowing for moderate diffusion and balancing the axial and radial pressure distribution, thus suppressing turbulence generation. After adjustment in this section, the water flows into the inlet section 2 in a stable state and is finally delivered to the pump body 3 to complete the pressurization process.

[0043] Through the synergistic effect of the segmented structure, the water flow is continuously controlled from guidance, acceleration, kinetic energy enhancement to pressure recovery. Combined with the dynamic adjustment of the guide vanes 6, the submersible pump can be operated efficiently and stably under low water level conditions.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A submersible pump equipped with a suction cylinder structure, comprising a pump body (3), an inlet section (2), and a motor (1) fixedly connected from top to bottom, wherein an outlet (4) is provided on the top of the pump body (3), characterized in that: The water inlet section (2) and the motor (1) are surrounded by a water suction cylinder (5) with an open bottom, wherein: The top end of the suction cylinder (5) is fixedly connected to the bottom end of the pump body (3), and the bottom end of the suction cylinder (5) extends to the bottom of the motor (1); The inner cavity of the water suction cylinder (5) is connected to the water inlet section (2), and the water is transported from the bottom of the water suction cylinder (5) to the top of the water suction cylinder (5) and enters the water inlet section (2) by negative pressure; The water suction cylinder (5) is provided with an inlet section (7), a transition section (8), an acceleration section (9) and a stabilization section (10) from bottom to top.

2. The submersible pump with a suction cylinder structure according to claim 1, characterized in that: The inner diameter of the inlet section (7) is constant and is the maximum value of each section, used to guide the water flow in; The inner diameter of the transition section (8) decreases linearly from the inlet section (7) to the acceleration section (9) to accelerate the water flow; The inner diameter of the acceleration section (9) is constant and is the minimum value of all sections, used to maintain the maximum flow velocity; The stabilizing section (10) increases continuously in the inner radial direction to suppress turbulence.

3. The submersible pump with a suction cylinder structure according to claim 2, characterized in that: The inner wall of the water suction cylinder (5) is fixedly provided with multiple guide vanes (6), wherein: The tilt angle of the guide vane (6) increases gradually from the inlet section (7) to the acceleration section (9) along the water flow direction; The number of the guide vanes (6) increases gradually from the inlet section (7) to the acceleration section (9) along the water flow direction.

4. The submersible pump with a suction cylinder structure according to claim 3, characterized in that: The number of guide vanes (6) in the stabilizing section (10) is the minimum among all sections, which is used to reduce water flow resistance; The guide vanes (6) of the stabilizing section (10) have an inclination angle that gradually decreases along the direction of water flow, in order to balance the pressure distribution and suppress turbulence.

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