A gate vortex-preventing water intake trash rack structure

Abstract

The utility model provides a kind of prevent the water intake of gate vortex and take water intake trash rack structure, including trash rack base ring, is equipped with several countersunk bolt holes on trash rack base ring, trash rack base ring is connected with water intake by countersunk bolt, several profiled trash rack strips are fixed in trash rack base ring, the direction parallel to the flow direction of water intake of the water inlet and outlet edge direction of profiled trash rack strip, the water outlet edge of profiled trash rack strip is asymmetric structure, by optimizing the structure of trash rack strip, profiled trash rack strip with water outlet edge being asymmetric structure is designed, prevent the water flow through water intake trash rack strip to produce gate vortex, while, improve trash rack self-vibration frequency to avoid gate vortex resonance frequency, solve the fracture problem caused by gate vortex resonance of trash rack.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy and hydropower technology, and in particular to a water intake trash rack structure for preventing vortex jamming. Background Technology

[0002] In conventional pumping stations, hydropower stations, and pumped storage power stations, the function of the intake trash rack is to prevent debris and dirt from entering the water intake channel and flowing into rotating machinery such as pumps, turbines, and pump-turbine systems, thereby preventing damage to the machinery and even related hydraulic structures, resulting in economic losses and jeopardizing the stable operation of the machinery.

[0003] Conventional trash rack designs typically only consider static load-bearing capacity, neglecting the vibration issues caused by dynamic water scouring. In recent years, several power plant trash racks have experienced varying degrees of fracture after a period of use. Statistics show that the most damaged bars are the second section, which is precisely the area with the highest flow velocity under high-flow conditions. Research and analysis indicate that the root cause of the bar fracture is the resonance between the bar's natural structural frequency and the Karman vortex hydraulic excitation frequency. Conventional power plant inlet trash racks have symmetrical semi-circular heads at both the inlet and outlet sides, causing the water flow to evenly separate to both sides at the outlet side, forming regular Karman vortices, which correspond precisely to the maximum Karman vortex excitation intensity. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a water intake debris barrier structure that prevents vortex trapping, which can solve the problem that traditional symmetrical semi-circular head debris barrier bars are prone to forming vortex trapping and causing the bars to break.

[0005] Therefore, the present invention adopts the following technical solution:

[0006] A water intake debris barrier structure for preventing vortex jamming includes a debris barrier base ring with several countersunk bolt holes. The debris barrier base ring is connected to the water intake via countersunk bolts. Several irregularly shaped debris barrier bars are fixed inside the debris barrier base ring. The inlet and outlet directions of the irregularly shaped debris barrier bars are parallel to the water flow direction of the water intake, and the outlet side of the irregularly shaped debris barrier bars has an asymmetrical structure.

[0007] Based on the above technical solutions, the present invention may also adopt the following further technical solutions, or combine these further technical solutions:

[0008] The outlet edge of the irregularly shaped trash rack has a smooth, single-sided arc-shaped slope with an acute angle.

[0009] The inlet side of the irregularly shaped trash rack has a symmetrical semi-circular head structure.

[0010] The irregularly shaped trash rack bars are circumferentially welded to the trash rack base ring.

[0011] The width of the irregularly shaped trash rack bar is smaller than the width of the trash rack base ring, and the two sides of the irregularly shaped trash rack bar in the width direction are located within the edge of the trash rack base ring.

[0012] The width of the irregularly shaped trash rack bar is greater than or equal to five times the radius of its symmetrical semi-circular head at the water inlet.

[0013] The radius of the arc-shaped slope is greater than or equal to three times the radius of the symmetrical semi-circular head of the inlet side of the irregularly shaped trash rack.

[0014] The outlet side of the irregular-shaped trash rack is provided with a circular chamfer, the radius of which is one-third of the radius of the symmetrical semi-circular head of the inlet side of the irregular-shaped trash rack.

[0015] The irregularly shaped trash rack bar consists of an inlet section, a flow section, and an outlet section along the width against the direction of water flow. The inlet section is semi-cylindrical, the flow section is rectangular and has the same thickness as the inlet section, one end of the outlet section is flush with the flow section, and the other end of the outlet section has a smooth, single-sided arc-shaped slope with an acute angle.

[0016] The width of the water passage section is the same as the radius of the water inlet section.

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects: by optimizing the structure of the trash rack, a special-shaped trash rack with an asymmetrical structure at the water edge is designed, which prevents the water flow from generating Karman vortices when passing through the trash rack at the water intake, while increasing the natural frequency of the trash rack to avoid the Karman vortex resonance frequency, thus solving the problem of the trash rack breaking due to Karman vortex resonance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the planar structure of this utility model.

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0020] Figure 3 This is a cross-sectional structural diagram of the irregular-shaped trash rack bar of this utility model. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote elements with the same or similar functions throughout. However, it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting this utility model. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this utility model.

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0023] This utility model provides a water intake trash rack structure to prevent vortex jamming, including a trash rack base ring 1. The trash rack base ring 1 has several countersunk bolt holes 3. The trash rack base ring 1 is connected to the water intake through countersunk bolts to avoid the impact of the water flow on the fixing bolts and improve the stability of the overall structure. Several irregular trash rack bars 2 are fixed inside the trash rack base ring 1. The water inlet and outlet sides of the irregular trash rack bars 2 are parallel to the water flow direction of the water intake, and the water outlet side of the irregular trash rack bars 2 has an asymmetrical structure.

[0024] In this embodiment, when the countersunk bolt passes through the countersunk bolt hole 3 and connects to the trash rack base ring 1, the countersunk bolt and the trash rack base ring 1 can be spot welded to prevent loosening.

[0025] In this embodiment, the outlet edge of the irregularly shaped trash rack bar 2 is provided with a smooth, single-sided arc-shaped slope 24 and the included angle of the slope is an acute angle, so as to change the natural frequency of the structure and avoid resonance.

[0026] The inlet side of the irregularly shaped trash rack bar 2 has a symmetrical semi-circular head structure.

[0027] The irregularly shaped trash rack strip 2 is welded to the trash rack base ring 1 by circumferential welding. Stress relief treatment should be carried out after welding.

[0028] The width of the irregularly shaped trash rack bar 2 is smaller than the width of the trash rack base ring 1, and the two sides of the irregularly shaped trash rack bar 2 in the width direction are located within the edge of the trash rack base ring 1.

[0029] The width of the irregularly shaped trash rack bar 2 is greater than or equal to five times the radius of its symmetrical semi-circular head at the water inlet.

[0030] The radius of the arc-shaped slope 24 is greater than or equal to three times the radius of the symmetrical semi-circular head of the inlet side of the irregular trash rack 2.

[0031] A circular chamfer 25 is provided on one side of the outlet edge of the irregular-shaped trash rack bar 2. The radius of the circular chamfer 25 is one-third of the radius of the symmetrical semi-circular head on the inlet edge of the irregular-shaped trash rack bar 2.

[0032] The width of the irregular trash rack 2 is composed of an inlet section 21, a water passage section 22, and an outlet section 23. The inlet section 21 is semi-cylindrical, the water passage section 22 is rectangular and its thickness is the same as that of the inlet section 21, one end of the outlet section 23 is flush with the water passage section 22, and the other end of the outlet section 23 is provided with a smooth transition single-sided arc-shaped slope 24 with an acute angle.

[0033] The width of the water passage section 22 is the same as the radius of the water inlet section 21.

[0034] The shape of the base ring 1 of the trash rack and the number of the irregular trash rack bars 2 can be adjusted according to actual needs. Several irregular trash rack bars 2 are evenly distributed in parallel to ensure water intake flow while preventing debris from entering.

[0035] The outlet edge of the irregularly shaped trash rack bar 2 can also be configured as an asymmetrical streamlined structure, trapezoidal structure, or single-sided cut flat slope structure, which can also suppress the formation of Karman vortices.

[0036] Based on the description and accompanying drawings of this utility model, those skilled in the art can easily manufacture or use the anti-jamming vortex water intake screen structure of this utility model, and can produce the positive effects described in this utility model.

[0037] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. The terms "installed," "set," "equipped with," "connected," "connected," and "sleeve-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two mechanisms, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] In the description of this utility model, it should be understood that the terms "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

[0039] Furthermore, in practicing the claims of this utility model, those skilled in the art can understand and influence variations to the disclosed embodiments through a study of the drawings, the disclosure, and the appended claims. Additionally, in the claims and description, words such as "comprising" and "containing" do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the present utility model are covered by the scope of the claims of the present utility model, and will not be listed here.

Claims

1. A structure of a trash rack of a water intake to prevent a stall, comprising a trash rack base ring (1), a number of countersunk bolt holes (3) are formed on the trash rack base ring (1), and the trash rack base ring (1) is connected with the water intake through countersunk bolts, characterized in that, The base ring (1) of the trash rack has several irregularly shaped trash rack bars (2) fixed inside. The direction of the inlet and outlet sides of the irregularly shaped trash rack bars (2) is parallel to the direction of water flow at the water intake. The outlet side of the irregularly shaped trash rack bars (2) has an asymmetrical structure.

2. A trash rack structure for a water intake to prevent the occurrence of a stall according to claim 1, wherein The outlet edge of the irregularly shaped trash rack (2) is provided with a smooth, single-sided arc-shaped slope (24) and the included angle of the slope is an acute angle.

3. The anti-vortex water intake trash rack structure of claim 1, wherein, The inlet side of the irregularly shaped trash rack (2) has a symmetrical semi-circular head structure.

4. The anti-jamming vortex intake debris barrier structure as described in claim 1, characterized in that, The irregularly shaped trash rack bar (2) is welded to the trash rack base ring (1) by circumferential welding.

5. The anti-jamming vortex intake debris barrier structure as described in claim 1, characterized in that, The width of the irregularly shaped trash rack bar (2) is smaller than the width of the trash rack base ring (1), and the two sides of the irregularly shaped trash rack bar (2) in the width direction are located within the edge of the trash rack base ring (1).

6. The anti-jamming vortex intake debris barrier structure as described in claim 1, characterized in that, The width of the irregularly shaped trash rack (2) is greater than or equal to five times the radius of its symmetrical semi-circular head at the water inlet.

7. The anti-jamming vortex intake debris barrier structure as described in claim 2, characterized in that, The radius of the arc-shaped slope (24) is greater than or equal to three times the radius of the symmetrical semi-circular head of the inlet side of the irregularly shaped trash rack (2).

8. The anti-jamming vortex intake debris barrier structure as described in claim 1, characterized in that, The irregularly shaped trash rack (2) has a circular chamfer (25) on one side of the water outlet edge. The radius of the circular chamfer (25) is one-third of the radius of the symmetrical semi-circular head of the water inlet edge of the irregularly shaped trash rack (2).

9. The anti-jamming vortex intake debris barrier structure as described in claim 1, characterized in that, The irregularly shaped trash rack (2) is composed of an inlet section (21), a water passage section (22), and an outlet section (23) along the width against the direction of water flow. The inlet section (21) is semi-cylindrical, the water passage section (22) is rectangular and its thickness is the same as that of the inlet section (21), one end of the outlet section (23) is flush with the water passage section (22), and the other end of the outlet section (23) is provided with a smooth transition single-sided arc-shaped slope (24) with an acute angle.

10. The anti-jamming vortex intake debris barrier structure as described in claim 9, characterized in that, The width of the water passage section (22) is the same as the radius of the water inlet section (21).

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