Cavitation-inhibited propeller wake flow compressor, power device, ship equipment and water pump

Abstract

The utility model discloses a cavitation inhibition propeller wake flow compressor, a power device, ship equipment and a water pump, and relates to the industrial equipment technology, and the cavitation inhibition propeller wake flow compressor comprises a front flow channel pressure stabilizing cavity axially arranged behind a propeller; the cross layering transfer cavity is axially arranged behind the front flow channel pressure stabilizing cavity, and the inner diameter of the cross layering transfer cavity is gradually increased in the flow channel direction; the axial laminar flow generator is axially arranged in the cross layering transfer cavity, and the axial laminar flow generator is internally provided with laminar flow pressurizing steps which are axially arranged; the radial laminar flow generator is distributed around the periphery of the axial laminar flow generation cavity, and the outer edge of the radial laminar flow generator is seamlessly fixed to the inner wall of the cross layering transfer cavity; and the rear diffusion cavity is located behind the cross layering transfer cavity, and the diameter of the rear diffusion cavity is suddenly enlarged in a step shape. The propeller tip low-pressure area caused by high-speed rotation of the propeller can be transferred to the rear portion of the wake flow field tightening transfer device, the threshold rotation speed of propeller cavitation is increased, and damage of the cavitation effect to the propeller is restrained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial equipment, in particular to a cavitation-inhibited propeller wake constrictor, a power device, a ship device and a water pump. BACKGROUND

[0002] The power propeller such as marine propeller and water pump propeller generates a velocity difference between the blade and the water flow during rotation, forming a static pressure. This static pressure causes the water flow to generate high pressure on the side of the blade close to the propeller, and low pressure on the side of the blade away from the propeller. This pressure difference generates a thrust to the high pressure side, thereby pushing the ship to move or pushing the water flow.

[0003] When the propeller rotates at a speed exceeding a certain threshold value, the pressure of the liquid in contact with the propeller surface continues to decrease, and the gas dissolved in the liquid will precipitate and form bubbles. When the bubbles flow to an area with higher pressure, the bubbles will quickly contract and eventually collapse due to the external pressure. During the collapse process, the potential energy stored in the bubbles is rapidly released, forming a strong shock wave and high temperature. This impact will cause micro deformation and peeling of the solid surface material, gradually forming cavitation pits. SUMMARY

[0004] The embodiments of the present application provide a cavitation-inhibited propeller wake constrictor, a power device, a ship device and a water pump to increase the threshold speed of cavitation occurrence of the propeller and inhibit the destructive effect of cavitation.

[0005] The embodiments of the present application provide a cavitation-inhibited propeller wake constrictor, comprising:

[0006] A shell is formed with a flow channel structure, and the shell comprises a front flow channel pressure stabilization chamber 1, a cross-layer transfer chamber 2 and a rear diffusion chamber 6 arranged in sections;

[0007] The front flow channel pressure stabilization chamber 1 is arranged axially behind the propeller wake field;

[0008] The cross-layer transfer chamber 2 is arranged axially behind the front flow channel pressure stabilization chamber 1;

[0009] An axial laminar flow generator 3 is arranged axially in the cross-layer transfer chamber 2, and the axial laminar flow generator 3 is provided with an axial laminar flow booster 4 arranged axially,

[0010] A radial laminar flow generator 5 is a plurality of laminar flow booster wings, which are distributed around the outer periphery of the axial laminar flow generator 3, and the outer edge is fixed to the inner wall of the cross-layer transfer chamber 2;

[0011] The rear diffusion chamber 6 is located behind the cross-layer transfer chamber 2, and the diameter is expanded in steps.

[0012] Optionally, the laminar flow booster stage 4 is arranged based on the inner side wall of the axial laminar flow generator 3, the opening diameter of which is smaller than the inner diameter of the axial laminar flow generator 3, and the rear side of the laminar flow booster stage 4 is provided with a stepped expansion structure.

[0013] Optionally, the axial laminar flow generator 3 is arranged axially in the middle position of the cross-layer transfer cavity 2.

[0014] Optionally, the extension line of the central section of any of the laminar flow booster wings is tangent to the inner diameter of the axial laminar flow generator 3.

[0015] Optionally, the number of the laminar flow booster wings is 6-9.

[0016] Optionally, the inner diameter of the cross-layer transfer cavity 2 gradually increases along the flow direction.

[0017] The embodiment of the present application also provides a marine power device, which comprises the cavitation-inhibited propeller wake tightener as described above.

[0018] The embodiment of the present application also provides a marine device, which comprises the power device as described above.

[0019] The embodiment of the present application also provides a water pump device, which comprises the cavitation-inhibited propeller wake tightener as described above.

[0020] The embodiment of the present application is a cavitation-inhibited propeller wake tightener, which realizes the transfer of the low-pressure area at the propeller tip caused by high-speed rotation of the propeller to the rear of the wake tightener, improves the threshold rotating speed of cavitation of the propeller, and inhibits the damage of cavitation to the propeller.

[0021] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, which can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limiting of the present application. Moreover, in the drawings, like reference numerals refer to similar components throughout the several views. In the drawings:

[0023] Figure 1 FIG. 1 is a cross-sectional view of the propeller wake tightener according to the embodiment of the present application;

[0024] Figure 2 FIG. 3 is a schematic view of the spoiler wing of the propeller wake tightener according to the embodiment of the present application being tangent to the inner edge of the laminar flow generator cavity.

[0025] Figure 3 To install the propeller of the wake tightener of the embodiments of the application. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0027] The embodiments of the present application provide a cavitation-inhibiting propeller wake tightener, as shown in Figure 1 comprises:

[0028] The shell is formed with a flow channel structure, and the shell comprises a front flow channel pressure stabilization chamber 1, a cross-layer transfer chamber 2, and a rear diffusion chamber 6 arranged in sections. The flow channel structure can be a tubular structure or other flow channel structure, which is not listed here.

[0029] The front flow channel pressure stabilization chamber 1 is axially arranged at the rear of the propeller wake field.

[0030] The cross-layer transfer chamber 2 is axially arranged at the rear of the front flow channel pressure stabilization chamber 1. In some embodiments, the inner diameter of the cross-layer transfer chamber 2 gradually increases along the flow channel direction. In a specific example, the axial direction referred to in this example is along the flow channel direction, and the same applies hereafter.

[0031] The axial laminar flow generator 3 is axially arranged in the cross-layer transfer chamber 2, and the axial laminar flow generator 3 is provided with an axial laminar flow booster step 4 arranged axially. In some embodiments, the axial laminar flow generator 3 is axially arranged at the middle position of the cross-layer transfer chamber 2.

[0032] The radial laminar flow generator 5 is a plurality of laminar flow booster wings distributed around the outer periphery of the axial laminar flow generator 3, and the outer edge is fixed to the inner wall of the cross-layer transfer chamber 2.

[0033] The rear diffusion chamber 6 is located at the rear of the cross-layer transfer chamber 2, and the diameter is expanded in steps.

[0034] The propeller wake tightener provided by the embodiments of the present application can transfer the low-pressure area at the tip of the propeller caused by high-speed rotation of the propeller to the rear of the wake tightener, improve the threshold rotation speed of cavitation of the propeller, and inhibit the damage of cavitation to the propeller.

[0035] In some embodiments, the laminar flow booster stage 4 is arranged based on the inner side wall of the axial laminar flow generator 3, the opening diameter of which is smaller than the inner diameter of the axial laminar flow generator 3, and the rear side of the laminar flow booster stage 4 is provided with a stepped expansion structure. As shown in Figure 1 The axial laminar flow generator 3 is provided with an axial laminar flow booster stage 4, and the rear side of the laminar flow booster stage 4 is provided with a stepped expansion structure.

[0036] In some embodiments, the extension line of the central section of any of the laminar flow booster wings is tangent to the inner diameter of the axial laminar flow generator 3.

[0037] In some embodiments, the number of the laminar flow booster wings is 6-9. As shown in Figure 2 In a specific example, the radial laminar flow generator 5 is composed of seven spiral laminar flow booster wings, which are evenly distributed around the outer periphery of the axial laminar flow generator 3 and are seamlessly fixed to the inner wall of the cross-layer transfer cavity 2, and the extension line of the central section of the laminar flow booster wings is tangent to the inner diameter of the axial laminar flow generator 3.

[0038] The propeller wake field cross-layer tight transfer device of the embodiments of the present application is arranged behind the power propeller, and the water flow behind the propeller flows in the front flow passage stable pressure cavity 1 in a state of rotational diffusion. The cross-layer transfer cavity 2 is arranged axially behind the front flow passage stable pressure cavity 1, and the diameter gradually increases from front to back, which cooperates with the rear diffusion cavity 6 to complete the rapid transfer of the low-pressure bubbles in the wake field. The axial laminar flow generator 3 and the radial laminar flow generator 5 cooperate to divide and tighten the rotational diffusion wake field into a cross-layer flow field, so as to realize the stable pressure of the fluid in the front flow passage stable pressure cavity 1. As shown in Figure 3 After the device is installed, the propeller does not cavitate at 6500r / min even if it originally cavitated at 2500r / min.

[0039] The embodiments of the present application also provide a marine power device, which comprises the cavitation-inhibited propeller wake tightener as described above. In a specific example, the marine power device can be a marine engine, including an electric motor and an oil motor.

[0040] The embodiments of the present application also provide a ship equipment, which comprises the power device as described above.

[0041] The embodiments of the present application also provide a water pump equipment, which comprises the cavitation-inhibited propeller wake tightener as described above. In a specific example, the water pump equipment of the embodiments of the present application can be a submersible pump.

[0042] It should be noted that, in the embodiments of the present application, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that comprises a list of elements not only includes those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0043] The above-mentioned sequence numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0044] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, but not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A cavitation-inhibited propeller wake reconcentrator characterized by, Comprising: a housing formed with a flow channel structure, the housing comprising a front flow channel stabilizing chamber (1), a cross-layer transfer chamber (2) and a rear diffusion chamber (6) arranged in sections; the front flow channel stabilizing chamber (1) is arranged axially behind the propeller wake field; the cross-layer transfer chamber (2) is arranged axially behind the front flow channel stabilizing chamber (1); an axial laminar flow generator (3) is arranged axially in the cross-layer transfer chamber (2), and the axial laminar flow generator (3) is provided with an axial laminar flow booster step (4); a radial laminar flow generator (5) is a plurality of laminar flow booster wings distributed around the outer periphery of the axial laminar flow generator (3), and the outer edge is fixed to the inner wall of the cross-layer transfer chamber (2); the rear diffusion chamber (6) is located behind the cross-layer transfer chamber (2) and has a stepped diameter expansion.

2. The cavitation-inhibited propeller wake reconcentrator of claim 1 wherein, The laminar flow booster step (4) is arranged based on the inner side wall of the axial laminar flow generator (3), and the opening diameter is smaller than the inner diameter of the axial laminar flow generator (3), and the rear side of the laminar flow booster step (4) is provided with a stepped expansion structure.

3. The cavitation-inhibited propeller wake reconcentrator of claim 2, wherein, The axial laminar flow generator (3) is arranged axially in the middle position of the cross-layer transfer chamber (2).

4. The cavitation-inhibited propeller wake reconcentrator of claim 3, wherein, The extension line of the center section of any laminar flow booster wing is tangent to the inner diameter of the axial laminar flow generator (3).

5. The cavitation-inhibited propeller wake reconcentrator of claim 1 wherein, The number of laminar flow booster wings is 6-9.

6. The cavitation-inhibited propeller wake reconcentrator of claim 1 wherein, The inner diameter of the cross-layer transfer chamber (2) gradually increases along the flow direction.

7. A marine power plant, characterized by A propeller wake tightener for suppressing cavitation according to any one of claims 1-6.

8. A vessel apparatus, characterized by A power device according to claim 7.

9. A water pumping apparatus, characterized by, A propeller wake tightener for suppressing cavitation according to any one of claims 1-6.

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