Shark mouth imitating type pump station water inlet horn mouth

Abstract

The invention provides a shark-mouth-imitated pump station water inlet horn mouth which comprises a shark-mouth-imitated streamline horn mouth body installed at the tail end of a water inlet pipeline in a water pump water inlet pool, and the shark-mouth-imitated streamline horn mouth body is connected with a water inlet pipe through a flange. The shape of the joint of the water inlet of the shark-mouth-imitated horn mouth and the water inlet pipe is circles with different sizes, the large circle at the water inlet is gradually reduced into the small circle at the joint of the shark-mouth-imitated horn mouth and the water inlet pipe, the middle of the shark-mouth-imitated horn mouth is in uniform transition through a series of circles with different diameters, and the centers of the series of circles are arranged in an oval shape on the plane, so that the horn mouth structure is in a streamline shape. The device can move along with the water inlet pipe of the water pump, is reasonable in structure, easy to produce and manufacture, convenient to use and easy to disassemble, and can remarkably improve the flow state of the inlet of the water pump, effectively inhibit the generation of bottom vortex and improve the operation stability of the pump station.

Description

Technical Field

[0001] The present invention belongs to the technical field of pump station intake basins, and particularly relates to a shark mouth-shaped intake bellmouth for a pump station. Background Art

[0002] Pump stations play an important role in fields such as agricultural irrigation, industrial water supply, and urban drainage. As an important part of the pump station, the rationality of the design of the intake basin directly affects the operation efficiency and stability of the pump station. In actual operation, due to complex incoming flow conditions, unreasonable design of the intake basin and other factors, harmful vortices such as suction vortices, wall-attached vortices, and bottom-attached vortices often occur near the water inlet of the pump. These vortices not only reduce the operation efficiency of the pump station, but may also cause unit vibration, increased wear, and even equipment failures. Therefore, how to effectively suppress the generation of vortices in the intake basin is one of the key issues to improve the operation performance of the pump station.

[0003] Currently, the vortex control technologies for pump station intake basins mainly include: setting guide piers and guide plates in the intake basin, and setting vortex dissipation cones at the bottom of the bellmouth. These measures have obvious advantages, but additional guide piers and guide plates need to be installed, and the structural requirements for the intake basin are relatively high. The installation and maintenance of the guide plates are relatively complex and the cost is relatively high.

[0004] In summary, there is a lack of a vortex dissipation device in this field that has a simple structure, is easy to use, has a wide applicability, and can suppress the formation of vortices from the source to improve the operation efficiency and stability of the pump station. Summary of the Invention

[0005] The present invention provides a shark mouth-shaped intake bellmouth for a pump station, which imitates the biological characteristics of the shark mouth with a gradually decreasing cross-section from the entrance to the exit, making the water flow entering the bellmouth smooth, suppressing the bottom-attached vortex, and improving the operation stability of the pump.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A shark mouth-shaped intake bellmouth for a pump station, comprising: A shark mouth-shaped streamline bellmouth body, the shark mouth-shaped streamline bellmouth body includes a bellmouth body entrance and a bellmouth body exit, wherein the bellmouth body exit is connected to the water inlet pipe; The cross-sections of the bellmouth body entrance and the bellmouth body exit are circles with different sizes, gradually shrinking from the large circle at the bellmouth body entrance to the small circle at the bellmouth body exit, and evenly transitioning through a series of circles with unequal diameters in the middle.

[0007] Further, the diameters of the series of circles change linearly, and the centers of the circles are arranged according to the ellipse equation in the XZ plane.

[0008] Further, the arrangement of the centers of the series of circles in the XZ plane satisfies:

[0009] Among them, is the length of the major semi-axis of the ellipse; is the height of the trumpet-shaped main body, x is the x coordinate on the XZ plane, z is the z coordinate on the XZ plane.

[0010] Furthermore, the ratio of the height of the trumpet-shaped main body to the length of the major semi-axis of the circle satisfies: .

[0011] Furthermore, the length of the major semi-axis of the ellipse a is determined by the formula .

[0012] Furthermore, the shark-mouth-shaped streamlined trumpet-shaped main body is connected to the water inlet pipe through a flange, and a sealing gasket is provided at the flange connection.

[0013] Furthermore, the shark-mouth-shaped streamlined trumpet-shaped main body and the water inlet pipe are of an integral structure.

[0014] Furthermore, the material of the shark-mouth-shaped streamlined trumpet-shaped main body is one of stainless steel, aluminum alloy or high-strength plastic.

[0015] Furthermore, the radian of the shark-mouth-shaped streamlined trumpet-shaped main body is realized by adjusting the parameters a and h of the ellipse equation to adapt to different flow rates and working conditions.

[0016] Furthermore, the diameter D of the inlet of the trumpet-shaped main body and the diameter d of the outlet of the trumpet-shaped main body and the height h are customized according to the actual working conditions of the water inlet pipe.

[0017] Compared with the prior art, the present invention has the following beneficial effects: Based on the bionics idea, the present invention designs a streamlined water inlet trumpet by imitating the structural characteristics of a shark's mouth, effectively improving the water flow pattern near the trumpet, making the water flow into the trumpet smooth, suppressing the bottom-attached vortex, and improving the operation stability of the water pump.

[0018] The present invention can change the streamlined radian by adjusting the arrangement mode of the centers of the series of gradually changing circles to adapt to different flow rates and working conditions, and has strong adaptability.

[0019] The size of the water inlet bell mouth of the present invention can be customized according to the diameter of the water inlet pipe, which is applicable to pumping stations of different specifications and has strong versatility.

[0020] The structure of the present invention is simple, easy to manufacture, with low cost, easy to install and disassemble, convenient for implementation and promotion, and has a remarkable vortex elimination effect, thus having a large market space. Description of the Drawings

[0021] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0022] Figure 1 It is a three-dimensional schematic diagram of the shark mouth-shaped pumping station water inlet bell mouth in the embodiment of the present invention.

[0023] Figure 2 It is the front view of the shark mouth-shaped pumping station water inlet bell mouth in the embodiment of the present invention.

[0024] Figure 3 It is the top view of the shark mouth-shaped pumping station water inlet bell mouth in the embodiment of the present invention.

[0025] Figure 4 It is the experimental effect diagram in the embodiment without adopting the present invention.

[0026] Figure 5 It is the experimental effect diagram in the embodiment adopting the present invention.

[0027] In the figure: 1 - Shark mouth-shaped streamlined bell mouth main body, 2 - Bell mouth main body inlet, 3 - Bell mouth main body outlet, 4 - Flange. Detailed Embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0030] Embodiment 1 As Figure 1 shown, this embodiment provides a shark - mouth - shaped pumping station inlet bell - mouth, as Figure 1 shown. Specifically, the shark - mouth - shaped pumping station inlet bell - mouth includes a shark - mouth - shaped streamline bell - mouth body 1. The bell - mouth body inlet 2 is circular, and the bell - mouth body outlet 3 at the connection with the water inlet pipe is also circular.

[0031] As Figure 2 and 3 shown, the shape of the connection structure between the bell - mouth body inlet 2 and the bell - mouth body outlet 3 is circles of different sizes, gradually shrinking from the large circle at the bell - mouth body inlet 2 to the small circle at the bell - mouth body outlet 3 at the connection with the water inlet pipe. The middle is evenly transitioned through a series of circles with unequal diameters. The diameters of the series of circles change linearly, and the centers of the series of circles are arranged in an elliptical shape on the plane. Its arrangement in the XZ plane satisfies: , where, is the semi - major axis length of the ellipse, which is jointly determined by the diameter D of the circle at the bell - mouth water inlet and the diameter d of the circle at the connection with the water inlet pipe; is the height of the bell - mouth, . This distribution makes the bell - mouth form a streamline structure that gradually shrinks from the large circle at the inlet to the small circle at the connection with the water inlet pipe. This structure can effectively improve the water flow pattern near the bell - mouth, make the water flow entering the bell - mouth smooth, and eliminate the bottom - attached vortex.

[0032] The shark - mouth - shaped streamlined bell - mouth body 1 is connected to the water inlet pipe through a flange 4. A sealing gasket is provided at the flange connection to ensure the connection tightness and prevent water leakage. The material of the water inlet bell - mouth can be selected from stainless steel, aluminum alloy or high - strength plastic, and the specific selection depends on the working environment of the pumping station and the corrosion resistance requirements. In addition, the shark - mouth - shaped streamlined bell - mouth body and the water inlet pipe can also be an integral structure.

[0033] In this embodiment: The height of the shark - mouth bell - mouth is 45 mm, the interface diameter d at the connection with the water inlet pipe is 65 mm, and the inlet diameter D of the bell - mouth is 130 mm. is 65 mm.

[0034] The specific implementation provided above is used for a model test to illustrate the feasibility of the present invention. In the model test: The water pump flow rate is set to , the water depth in the intake pool is 94 mm, and the Froude number is 1.92, and the relative submergence depth = 0.75. Under this condition, compared with the prototype bell - mouth, the control effect of the shark - mouth - shaped water inlet bell - mouth on the bottom - attached vortex is studied.

[0035] Figure 4 is a schematic diagram of the generation of the bottom - attached vortex without using the shark - mouth - shaped water inlet bell - mouth. Figure 5 is a schematic diagram of the elimination of the bottom - attached vortex after installing the shark - mouth - shaped water inlet bell - mouth. By comparing Figure 4 and Figure 5 , it can be found that installing the shark - mouth - shaped pumping - station water inlet bell - mouth provided in this embodiment can effectively inhibit the generation of the bottom - attached vortex under this condition.

[0036] In this embodiment, the streamlined profile of the shark - mouth reduces the boundary - layer separation and turbulent kinetic - energy dissipation, and reduces the probability of the formation of local low - pressure areas. According to Bernoulli's equation, the pressure decreases when the flow velocity increases, but the streamlined design makes the pressure gradient gentle, avoiding the concentration of low - pressure areas, thereby suppressing the suction vortex and the bottom - attached vortex.

[0037] The geometric characteristics of the ellipse - square ensure that the water - flow cross - section gradually shrinks and the flow velocity increases linearly. By adjusting a a and h h , the contraction rate can be controlled to match the flow - velocity distribution under different flow rates, and avoid the energy loss caused by sudden changes in flow velocity.

[0038] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A shark mouth-like pump station water inlet bell mouth, characterized in that: include: A shark-mouth-like streamlined bell-mouth body, wherein the shark-mouth-like streamlined bell-mouth body comprises a bell-mouth body inlet and a bell-mouth body outlet, wherein the bell-mouth body outlet is connected to a water inlet pipe; The cross sections of the bell mouth main body inlet and the bell mouth main body outlet are circles of different sizes, which gradually shrink from a large circle at the bell mouth main body inlet to a small circle at the bell mouth main body outlet, and are evenly transitioned through a series of circles of unequal diameters.

2. The shark mouth-shaped pump station water inlet bell mouth according to claim 1, characterized in that: The diameters of the series of circles vary linearly, and the centers of the circles are arranged on the XZ plane according to the equation of an ellipse.

3. The shark mouth-like pump station water inlet bell mouth according to claim 2, characterized in that: The centers of the series of circles are arranged on the XZ plane to satisfy: in, is the length of the major semi-axis of the ellipse; is the height of the bell body, x On the XZ plane x coordinate, z On the XZ plane z coordinate.

4. The shark mouth-shaped pump station water inlet bell mouth according to claim 3, characterized in that: The ratio of the height of the bell mouth body to the semi-major axis length of the circle satisfies: 。 5. The shark mouth-shaped pump station water inlet bell mouth according to claim 1, characterized in that: The length of the major semi-axis of the ellipse a By formula Sure.

6. The shark mouth-like pump station water inlet bell mouth according to claim 1, characterized in that: The shark-mouth-like streamlined bell mouth body is connected to the water inlet pipe through a flange, and a sealing gasket is provided at the flange connection.

7. The shark mouth-like pump station water inlet bell mouth according to claim 1, characterized in that: The shark-mouth-like streamlined bell mouth main body and the water inlet pipe are an integrated structure.

8. The shark mouth-shaped pump station water inlet bell mouth according to claim 1, characterized in that: The material of the shark mouth-like streamlined bell mouth body is one of stainless steel, aluminum alloy or high-strength plastic.

9. The shark mouth-like pump station water inlet bell mouth according to claim 3, characterized in that: The curvature of the shark mouth streamlined bell mouth body is adjusted by adjusting the ellipse equation parameters a and h To meet the needs of different flow rates and working conditions.

10. The shark mouth-like pump station water inlet bell mouth according to claim 3, characterized in that: The diameter of the bell mouth body entrance D and the diameter of the bell body outlet d and height h Customized according to the actual working conditions of the water inlet pipe.

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