Cavitation jet nozzle with oblique helical blade coupled with Helmholtz oscillation cavity

Abstract

The invention discloses a cavitation jet nozzle of an oblique helical blade coupled Helmholtz oscillation cavity, and relates to the technical field of cavitation jet nozzles. The cavitation jet nozzle comprises a nozzle body, the nozzle body is provided with an inlet section, a contraction section, an oscillation cavity and an outlet section in the axial direction, and adjacent components communicate with each other; a flow guide portion is arranged on the spiral blade, the flow guide portion comprises a first component and a second component, the first component is composed of an oblique spiral blade, and the second component is composed of two oblique spiral blades. The first component and the second component are fixed in the inlet section, and a flow channel in the axial direction of the inlet section is formed between the first component and the second component. The inclined spiral blade structure in the flow guide part is matched with the Helmholtz oscillation cavity, the fluid generates a high tangential flow speed through the inclined spiral blade structure, and the cleaning effect of the fluid on a curved surface or the inner wall of a pipeline is remarkably improved through cavitation bubbles generated by the oscillation cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of cavitating jet nozzles, and in particular to a cavitating jet nozzle with an inclined spiral blade coupled with a Helmholtz oscillation cavity. Background Art

[0002] On the surfaces of some devices and tools that need to be immersed in seawater for a long time, a large number of marine organisms such as barnacles will generally adhere and a large amount of dirt will be deposited, thus damaging the surface coating, increasing the surface roughness, further affecting the normal operation of sensors, reducing work efficiency, increasing energy consumption, and even affecting the normal operation of the device if not cleaned for a long time.

[0003] Currently, a cavitating jet spraying device is commonly used to clean the organisms and dirt attached to the outer surface of the device, and the nozzle structure is the key part for generating cavitating jets. According to the principle of cavitation generation, cavitating jet technology can be divided into flow-around type, shear type and oscillating type nozzles. Among them, the self-excited oscillating nozzle uses its own structure to generate resonance cavitation, thereby generating high-intensity cavitating jets. Currently, the commonly used self-excited oscillating nozzles include the organ pipe cavitating nozzle and the Helmholtz cavitating nozzle. The cavitation bubbles generated by the Helmholtz cavitating nozzle have strong migration ability, and the peak value of the self-excited resonance frequency amplitude is higher than that of the organ pipe nozzle, which can more effectively remove the marine organism attachments on the object surface. However, when cleaning a surface with a certain curvature or the inside of a pipeline, the traditional Helmholtz cavitation cleaning nozzle cannot clean the inner surface of the pipeline.

[0004] Chinese patent document CN104307651A discloses a centralized rotary cavitating jet nozzle, which consists of a cylindrical inlet section, a cylindrical resonance cavity, a cylindrical small hole and a cylindrical outlet section. There are multiple air inlet pipes at the nozzle outlet section, and the inner holes of the air inlet pipes are tangent to the inner hole of the cylindrical outlet section. Compressed air is introduced into the air inlet pipes, and the compressed air introduced from multiple air inlet pipes enters tangentially, forming a gas swirl surrounding the water jet in the cylindrical outlet section of the nozzle, driving the water jet to generate a rotary vortex in the cylindrical outlet section. Although the technical solution disclosed in this document can generate a rotary vortex, due to its externally added tangential air inlet pipes, the structure is relatively complex and the volume is relatively large, which is not conducive to use in a narrow space such as a pipeline, and the application scenario is greatly limited. Chinese patent document CN107385172A discloses a device for cavitating jet strengthening on the metal surface, including a spiral cavitating jet nozzle. The spiral cavitating jet nozzle is installed on a three-coordinate moving device and is located above the processing tank, and a water supply system supplies water to the spiral cavitating jet nozzle. However, in this document, due to the narrow flow channel of the spiral acceleration section, a large amount of liquid cannot pass through, which is easy to cause blockage, resulting in a high replacement frequency. At the same time, due to its narrow inlet, the liquid resistance is large, and the energy consumption required to generate cavitating jets of the same intensity is higher. Summary of the Invention

[0005] In view of the problems existing in the currently available cavitating jet nozzles, such as the narrow flow channel in the acceleration section, which is prone to blockage, high energy consumption, and large volume, making it unfavorable for use in narrow spaces, the present invention discloses a cavitating jet nozzle with an inclined spiral blade coupled with a Helmholtz oscillation cavity.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A cavitating jet nozzle with an inclined spiral blade coupled with a Helmholtz oscillation cavity includes a nozzle body. The nozzle body is axially provided with an inlet section, a contraction section, an oscillation cavity, and an outlet section, and adjacent components are connected. A guiding part is provided, and the guiding part includes a first component and a second component. The first component consists of an inclined spiral blade, and the second component consists of two inclined spiral blades. The first component and the second component are fixed in the inlet section, and a flow channel is formed axially along the inlet section between the first component and the second component.

[0008] Furthermore, the outer walls of the first component and the second component are fixedly connected to the inner wall of the inlet section.

[0009] Furthermore, the collision wall on one side of the oscillation cavity protrudes inward and is provided with a first channel, and the collision wall on the other side is provided with a second channel. The oscillation cavity is connected to the outlet section through the first channel and is connected to the contraction section through the second channel.

[0010] Furthermore, the ratio between the diameter of the flow channel, the diameter of the inlet section, the length of the inlet section, the diameter of the second channel, the length of the oscillation cavity, the diameter of the oscillation cavity, and the diameter of the first channel is 0.5:2:5:1:5:8:2.

[0011] Furthermore, the contraction angle of the contraction section is 13.5°.

[0012] Furthermore, a protruding part is formed by the protrusion of the collision wall. The cross-section of the protruding part is trapezoidal, and the apex angle of the protruding part is 120°.

[0013] Furthermore, the diffusion angle of the outlet section is 120°.

[0014] Furthermore, the helix surface inclination angle of each inclined spiral blade in the first component and the second component is 30°.

[0015] Furthermore, the diameter of the flow channel is 2 mm, and the ratio between the diameter of the flow channel and the thickness of each inclined spiral blade is 5:1.

[0016] Furthermore, the length of the oscillation cavity is 5 mm.

[0017] The beneficial effects of the present invention are as follows: The present invention utilizes the cooperation between the inclined spiral blade structure in the flow guiding part and the Helmholtz - type oscillation cavity. Through the inclined spiral blade structure, a relatively high tangential flow velocity of the fluid is generated, resulting in a tangential eddy current, and cavitation bubbles with strong migration ability are generated through the oscillation cavity, so as to significantly improve the cleaning effect of the fluid on the curved surface or the inner wall of the pipeline. In the present invention, a flow channel is formed by the gap between the first component and the second component, which can enable the fluid to have no liquid resistance when passing through the flow channel, significantly increase the flow rate, avoid blockage, and reduce energy consumption. In the present invention, the first component and the second component are fixed in the inlet section, preventing the first component and the second component from rotating when the fluid passes through, avoiding damage, and since the central axis structure is removed, the liquid resistance is greatly reduced, and the volume can be significantly reduced, expanding the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structural principle schematic diagram of an embodiment of the present invention is shown.

[0019] Figure 2 Shown as Figure 1 the front view.

[0020] Figure 3 Shown as Figure 1 the top view.

[0021] Figure 4 Shown as Figure 3 the sectional view at A in

[0022] Figure 5 Shown as Figure 4 the side view.

[0023] Figure 6 The structural schematic diagram of the flow guiding part is shown.

[0024] Figure 7 Shown as Figure 6 the front view.

[0025] Figure 8 For Figure 6 the partial structure diagram, showing the structure of the second component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention discloses a cavitating jet nozzle with an inclined spiral blade coupled with a Helmholtz oscillation cavity. The following is a specific description of an embodiment of the present invention with reference to the accompanying drawings.

[0027] Combined with Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the cavitating jet nozzle includes a nozzle body. The nozzle body is sequentially provided with an inlet section 1, a contraction section 2, an oscillation cavity 4, and an outlet section 6 along the axial direction, and the adjacent components are communicated. Combined with Figure 6 , Figure 7 and Figure 8 As shown, a flow guiding part 8 is arranged in the inlet section 1. The flow guiding part 8 is divided into a first component 801 and a second component 802. The first component 801 is composed of an inclined spiral blade. The second component 802 is composed of two inclined spiral blades, and the inner edges between the two inclined spiral blades are fixedly connected. The outer walls of the first component 801 and the second component 802 are fixedly connected to the inner wall of the inlet section 1. There is a flow channel 803 formed by a gap between the first component 801 and the second component 802, and the flow channel 803 is coaxial with the inlet section 1. The diameter of the flow channel 803 is 2 mm. The helix angle of each spiral blade in the first component 801 and the second component 802 is 30°, and the ratio between the diameter of the flow channel 803 and the thickness of each spiral blade is 5:1.

[0028] As Figure 5 shown, the cross-section of the contraction section 2 is trapezoidal, divided into a large head and a small head, and the contraction angle of the contraction section 2 is 13.5°. The cross-section of the outlet section 6 is trapezoidal, divided into a large head and a small head, and the divergence angle of the outlet section 6 is 120°. The oscillation cavity 4 is a Helmholtz type oscillation cavity 4. The collision wall on the side of the oscillation cavity 4 adjacent to the outlet section 6 protrudes inward and forms a protrusion 7. The cross-section of the protrusion 7 is trapezoidal, and the apex angle of the protrusion 7 is 120°. The protrusion 7 is provided with a first channel 5, and the first channel 5 is connected to the small head of the outlet section 6. The collision wall on the side of the oscillation cavity 4 adjacent to the inlet section 1 is provided with a second channel 3, and is connected to the small head of the contraction section 2 through the second channel 3. The ratio between the diameter of the flow channel 803, the diameter of the inlet section 1, the length of the inlet section 1, the diameter of the second channel 3, the length of the oscillation cavity 4, the diameter of the oscillation cavity 4, and the diameter of the first channel 5 is 0.5:2:5:1:5:8:2, and in this embodiment, the length of the oscillation cavity 4 is 5 mm.

[0029] During use, when the fluid passes through the first component 801 and the second component 802 located in the inlet section 1, a relatively high tangential flow velocity can be generated along the helical surface of the inclined helical blade. And since the first component 801 and the second component 802 are fixed in the inlet section 1, the first component 801 and the second component 802 do not rotate when the fluid passes through, which can significantly improve the durability and is not easily damaged. There is a flow channel 803 coaxially arranged with the inlet section 1 between the first component 801 and the second component 802, which can enable the fluid to flow unobstructed in the axial direction along the flow channel 803 when passing through the inlet section 1, significantly reducing the resistance of the fluid, increasing the flow rate, and thus significantly reducing the energy consumption. The fluid is pressurized in the contraction section 2 to obtain a relatively high axial flow velocity and enters the oscillation cavity 4. Part of the fluid performs self-excited oscillation in the oscillation cavity 4 to generate a rotating cavitation jet, and then the cavitation jet generated by the oscillation cavity 4 is released outward through the outlet section 6. The tangential rotating vortex cavitation with strong migration ability generated is used to clean the surface attached with impurities and dirt, significantly enhancing the cleaning effect of the cavitation jet.

[0030] Certainly, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the substantial scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A cavitating jet nozzle with an inclined spiral blade coupled to a Helmholtz oscillation cavity, characterized in that: It includes a nozzle body, and an inlet section (1), a contraction section (2), an oscillation cavity (4) and an outlet section (6) are axially arranged on the nozzle body, and adjacent components are in communication; a diversion part (8) is provided, and the diversion part (8) includes a first component (801) and a second component (802), the first component (801) consists of an inclined spiral blade, and the second component (802) consists of two inclined spiral blades; the first component (801) and the second component (802) are fixed in the inlet section (1), and a flow channel (803) along the axial direction of the inlet section (1) is formed between the first component (801) and the second component (802).

2. The cavitating jet nozzle with an inclined spiral blade coupled with a Helmholtz oscillation cavity according to claim 1, wherein: The outer walls of the first component (801) and the second component (802) are fixedly connected to the inner wall of the inlet section (1).

3. The cavitating jet nozzle with an inclined helical blade coupled with a Helmholtz oscillation cavity according to claim 1, characterized in that: On one side of the oscillation cavity (4), the collision wall protrudes inward and is provided with a first channel (5), and on the other side of the collision wall, a second channel (3) is provided. The oscillation cavity (4) is communicated with the outlet section (6) through the first channel (5) and is communicated with the contraction section (2) through the second channel (3).

4. A cavitating jet nozzle with an inclined spiral blade coupled with a Helmholtz oscillation cavity according to claim 3, characterized in that: The ratio between the diameter of the flow channel (803), the diameter of the inlet section (1), the length of the inlet section (1), the diameter of the second channel (3), the length of the oscillation cavity (4), the diameter of the oscillation cavity (4) and the diameter of the first channel (5) is 0.5:2:5:1:5:8:

2.

5. The cavitating jet nozzle with an inclined spiral blade coupled with a Helmholtz oscillation cavity according to claim 1, characterized in that: The contraction angle of the contraction section (2) is 13.5°.

6. The cavitating jet nozzle with an inclined spiral blade coupled with a Helmholtz oscillation cavity according to claim 4, characterized in that: A protrusion is formed by the protrusion of the collision wall. The cross-section of the protrusion (7) is trapezoidal, and the apex angle of the protrusion (7) is 120°.

7. The cavitating jet nozzle with an inclined spiral blade coupled with a Helmholtz oscillation cavity according to claim 1, characterized in that: The diffusion angle of the outlet section (6) is 120°.

8. The cavitating jet nozzle with an inclined spiral blade coupling a Helmholtz oscillation cavity according to claim 1, characterized in that: The helix surface inclination angles of the inclined spiral blades in the first component (801) and the second component (802) are both 30°.

9. The cavitating jet nozzle with an inclined helical blade coupled with a Helmholtz oscillation cavity according to claim 1, characterized in that: The diameter of the flow channel (803) is 2 mm, and the ratio between the diameter of the flow channel (803) and the thickness of each inclined spiral blade is 5:

1.

10. The cavitating jet nozzle with an inclined spiral blade coupled with a Helmholtz oscillation cavity according to claim 1, characterized in that: The length of the oscillation cavity (4) is 5 mm.

Images