Main pump blade of icebreaker

Abstract

The invention discloses a main pump blade of an icebreaker, which belongs to the technical field of fluid machinery and comprises a blade body, and a plurality of openings are formed in the blade body and are arranged in an array along the streamline direction of the blade body; a notch is formed in the tail of the blade body, and a mesh structure is fixedly arranged in the notch. The front edge thickness of the blade body is smaller than the rear edge thickness of the blade body. According to the ice breaker main pump blade, the multiple openings are formed in the blade body in an array mode, and the tail of the blade body is replaced with the mesh structure, so that on the premise that the hydraulic performance of an ice breaker main pump is guaranteed, the water flow resistance is reduced, and the working efficiency of the ice breaker main pump is improved; the improved blade structure can effectively reduce the loss of the pump blade, and the service life of the pump blade in ice layer navigation is prolonged; the mesh structure not only optimizes the flow field, but also reduces the vortex when water flows through the tail of the blade body and reduces the formation of wake flow, thereby improving the stability and propulsion effect of a pump system.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery, and particularly relates to a main pump blade of an icebreaker. Background Art

[0002] Icebreakers are usually equipped with powerful main pumps to help the ship pass through ice areas. Due to insufficient icebreaking ability, the traditional blade structure may lead to low icebreaking efficiency, making it difficult to cope with different hardness and thicknesses of ice layers. It is precisely because the surface design of the blade is not optimized enough, resulting in large energy losses during the cutting process of water flow and ice layer, leading to low overall energy efficiency. At the same time, the strong impact of the ice layer on the blade often causes significant wear and shortens the service life of the blade.

[0003] Therefore, it is urgent to design a main pump blade for an icebreaker to achieve higher icebreaking ability, lower energy loss, and longer service life. By optimizing the shape and surface structure of the blade, water flow disturbance and cavitation phenomenon are reduced, ensuring the stability and reliability of the pump under various complex working conditions. Summary of the Invention

[0004] The purpose of the present invention is to provide a main pump blade for an icebreaker to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above purpose, the present invention provides a main pump blade for an icebreaker, including a blade body. A plurality of openings are provided on the blade body, and the plurality of openings are arranged in an array along the streamline direction of the blade body; a notch is formed at the tail of the blade body, and a grid structure is fixedly arranged in the notch; the leading edge thickness of the blade body is less than the trailing edge thickness of the blade body.

[0006] Preferably, an anti-corrosion and wear-resistant coating is provided on the surface of the blade body.

[0007] Preferably, the material of the blade body is stainless steel.

[0008] Preferably, the distance relationship between two adjacent openings is as follows:

[0009]

[0010] Wherein, L is the axial distance between the two openings, u is the streamline distance between the two openings, and d is the diameter of the opening.

[0011] Preferably, a plurality of spherical protrusions are provided on the back surface of the blade body, and the spherical protrusions are arranged in one-to-one correspondence with the openings; three oval openings are formed on the spherical protrusions, and all three oval openings are tangent to the outer diameter circle of the spherical protrusions.

[0012] Preferably, the diameter d of the opening is 8 mm, the height h of the spherical protrusion is 4 mm, the major axis a of the elliptical opening is 1.5 mm, and the minor axis b of the elliptical opening is 0.85 mm.

[0013] Preferably, the centers of the three elliptical openings are arranged in an equilateral triangle.

[0014] Preferably, the grid structure is flush with the tail of the blade body, and the relationship between the outlet width of the grid structure and the tail width of the blade body is:

[0015]

[0016] where H is the outlet width of the grid structure and b2 is the tail width of the blade body.

[0017] Preferably, according to the cutting law of the impeller, the relationship between the grid structure and the specific speed n is:

[0018] 120 ≤ n ≤ 500

[0019]

[0020] The relationship between the starting position diameter of the grid structure and the tail diameter of the blade body is:

[0021] ΔD = D2 - D2'

[0022]

[0023] where D2' is the starting position diameter of the grid structure, D2 is the tail diameter of the blade body, n is the specific speed of the pump, Q is the flow rate, and h is the head.

[0024] Preferably, the relationship between the grid size of the grid structure and the outlet width of the grid structure is:

[0025]

[0026] where a is the length of the grid, b is the width of the grid, H is the outlet width of the grid structure, and Z is the tail thickness of the blade body.

[0027] Compared with the prior art, the present invention has the following advantages and technical effects:

[0028] The impeller blades of the icebreaker provided by the present invention have multiple openings arranged in an array in the blade body, and the tail of the blade body is replaced with a grid structure. On the premise of ensuring the hydraulic performance of the main pump of the icebreaker, the water flow resistance is reduced, and the working efficiency of the main pump of the icebreaker is improved; the improved blade structure can effectively reduce the loss of the pump blades and improve their service life during navigation in ice; the grid structure not only optimizes the flow field, but also reduces the eddy current when the water flows through the tail of the blade body, reducing the formation of the wake, thereby improving the stability and propulsion effect of the pump system. Brief Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic structural diagram of the impeller blade of the icebreaker of the present invention;

[0031] Figure 2 It is a schematic diagram of the spherical protrusion arranged along the streamline direction of the blade body of the present invention;

[0032] Figure 3 It is an enlarged schematic diagram of the grid structure at the tail of the blade body of the present invention;

[0033] Figure 4 It is an axial projection diagram of the impeller before and after the grid structure at the tail of the blade body of the present invention is replaced;

[0034] In the figure: 1. Blade body; 2. Opening; 3. Grid structure; 4. Oval opening; 5. Spherical protrusion; 6. Starting position of the grid structure; 7. Outlet of the grid structure; 8. Grid. Detailed Embodiments

[0035] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. The following will refer to the drawings and combine the embodiments to detail the present invention.

[0036] As Figures 1 to 4As shown in the figure, the present invention provides a blade for the main pump of an icebreaker, which includes a blade body 1. A plurality of openings 2 are arranged on the blade body 1, and the plurality of openings 2 are arranged in an array along the streamline direction of the blade body 1; a notch is formed at the tail of the blade body 1, and a grille structure 3 is fixedly arranged in the notch; the leading edge thickness of the blade body 1 is less than the trailing edge thickness of the blade body 1.

[0037] The leading edge of the blade body 1 of the present invention is thinner, which can reduce the impact loss, and the trailing edge is thicker, which can increase the structural strength. By arranging a plurality of openings 2 in an array in the blade body 1 and replacing the tail of the blade body 1 with a grille structure 3, the water flow resistance is reduced and the working efficiency of the main pump of the icebreaker is improved on the premise of ensuring the hydraulic performance of the main pump of the icebreaker; the grille structure 3 not only optimizes the flow field, but also reduces the eddy current when the water flows through the tail of the blade body 1, reducing the formation of the wake flow, thereby improving the stability and propulsion effect of the pump system.

[0038] In a further optimized scheme, an anti-corrosion and wear-resistant coating is provided on the surface of the blade body 1.

[0039] By coating the surface of the blade body 1, its corrosion resistance and wear resistance can be enhanced.

[0040] In a further optimized scheme, the material of the blade body 1 is stainless steel.

[0041] In a further optimized scheme, the distance relationship between two adjacent openings 2 is:

[0042]

[0043] wherein, L is the axial distance between two openings 2, u is the streamline distance between two openings 2, and d is the diameter of the opening 2.

[0044] In a further optimized scheme, a plurality of spherical protrusions 5 are provided on the back surface of the blade body 1, and the spherical protrusions 5 are arranged in one-to-one correspondence with the openings 2; three elliptical openings 4 are provided on the spherical protrusions 5, and the three elliptical openings 4 are all tangent to the outer diameter circle of the spherical protrusions 5.

[0045] In a further optimized scheme, the diameter d of the opening 2 is 8 mm, the height h of the spherical protrusion 5 is 4 mm, the major axis a of the elliptical opening 4 is 1.5 mm, and the minor axis b of the elliptical opening 4 is 0.85 mm.

[0046] In a further optimized scheme, the centers of the three elliptical openings 4 are arranged in an equilateral triangle.

[0047] In a further optimized scheme, the grille structure 3 is flush with the tail of the blade body 1, and the relationship between the width of the outlet 7 of the grille structure and the width of the tail of the blade body 1 is:

[0048]

[0049] Wherein, H is the width of the outlet 7 of the grating structure, and b2 is the width of the tail of the blade body 1.

[0050] For a further optimization scheme, according to the cutting law of the impeller, the relationship between the grating structure 3 and the specific speed n is:

[0051] 120 ≤ n ≤ 500

[0052]

[0053] The relationship between the diameter of the starting position 6 of the grating structure and the tail diameter of the blade body 1 is:

[0054] ΔD = D2 - D'2

[0055]

[0056] Wherein, D'2 is the diameter of the starting position 6 of the grating structure, D2 is the tail diameter of the blade body 1, n is the specific speed of the pump, Q is the flow rate, and h is the head.

[0057] For a further optimization scheme, the relationship between the size of the grid 8 of the grating structure 3 and the width of the outlet 7 of the grating structure is:

[0058]

[0059] Wherein, a is the length of the grid 8, b is the width of the grid 8, H is the width of the outlet 7 of the grating structure, and Z is the tail thickness of the blade body 1.

[0060] For the main pump blade of the icebreaker provided by the present invention, by providing a shavings-like opening 2 on the blade body 1 and adopting a grating structure 3 at the tail of the blade body 1, it is possible to reduce the water flow resistance and improve the working efficiency of the main pump of the icebreaker on the premise of ensuring the hydraulic performance of the main pump of the icebreaker. The improved blade structure can effectively reduce the loss of the pump blade and improve its service life during navigation in ice. The grating structure 3 not only optimizes the flow field, but also reduces the eddy current when the water flows through the tail of the blade body 1, reduces the formation of the wake flow, and thus improves the stability and propulsion effect of the pump system.

[0061] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A main pump blade of an icebreaker, characterized in that, It includes a blade body (1), and a plurality of openings (2) are arranged on the blade body (1), and the plurality of openings (2) are arranged in an array along the streamline direction of the blade body (1); a notch is formed at the tail of the blade body (1), and a grid structure (3) is fixedly arranged in the notch; the leading edge thickness of the blade body (1) is less than the trailing edge thickness of the blade body (1).

2. The impeller blade of the main pump of the icebreaker according to claim 1, wherein, An anti-corrosion and wear-resistant coating is provided on the surface of the blade body (1).

3. The impeller blade of the main pump of the icebreaker according to claim 1, characterized in that, The material of the blade body (1) is stainless steel.

4. The impeller blade of the main pump of an icebreaker according to claim 1, wherein, The distance relationship between two adjacent openings (2) is as follows: Wherein, L is the axial distance between the two openings (2), u is the streamline distance between the two openings (2), and d is the diameter of the opening (2).

5. The main pump blade of an icebreaker according to claim 4, characterized in that A plurality of spherical protrusions (5) are arranged on the back surface of the blade body (1), and the spherical protrusions (5) are arranged in one-to-one correspondence with the openings (2); three oval openings (4) are formed in the spherical protrusions (5), and the three oval openings (4) are all tangent to the outer diameter circle of the spherical protrusions (5).

6. The main pump blade of an icebreaker according to claim 5, characterized in that, The diameter d of the opening (2) is 8 mm, the height h of the spherical protrusion (5) is 4 mm, the major axis a of the oval opening (4) is 1.5 mm, and the minor axis b of the oval opening (4) is 0.85 mm.

7. The impeller blade of the main pump of an icebreaker according to claim 5, characterized in that, The centers of the three oval openings (4) are arranged in an equilateral triangle.

8. The impeller blade of the main pump of the icebreaker according to claim 1, wherein The grid structure (3) is flush with the tail of the blade body (1), and the relationship between the outlet width of the grid structure (3) and the tail width of the blade body (1) is as follows: Wherein, H is the outlet width of the grid structure (3), and b2 is the tail width of the blade body (1).

9. The impeller blade of the main pump of the icebreaker according to claim 8, characterized in that, According to the cutting law of the impeller, the relationship between the grid structure (3) and the specific speed n is as follows: 120≤n≤500 The relationship between the starting position diameter of the grid structure (3) and the tail diameter of the blade body (1) is as follows: ΔD = D2 - D2 Wherein, D2′ is the starting position diameter of the grid structure (3), D2 is the tail diameter of the blade body (1), n is the specific speed of the pump, Q is the flow rate, and h is the head.

10. The impeller blade of the main pump of an icebreaker according to claim 8, characterized in that, The relationship between the grid (8) size of the grid structure (3) and the outlet width of the grid structure (3) is as follows: Wherein, a is the length of the grid (8), b is the width of the grid (8), H is the outlet width of the grid structure (3), and Z is the tail thickness of the blade body (1).

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