Self-energizing nozzle with helical flow director

Abstract

The application discloses a self-pressurizing nozzle with a spiral flow director, which is applied to a fluid mechanical pressurizing system to solve the problems of low vortex intensity, poor structural stability, insufficient corrosion resistance and drag reduction of a traditional nozzle. The nozzle body is made of brass, the diameter of the inlet and the outlet is matched with the main flow pipeline, and the innovation point is the collaborative design of the parameter optimization of the spiral flow director, a high-strength connection process and a corrosion-resistant and drag-reducing coating. The nozzle is characterized in that: the stainless steel spiral flow director is arranged in the outlet, the parameter is optimized through fluid simulation, and the vortex enhancement efficiency is greater than or equal to 23%; the spiral flow director is fixed through suitable power fiber laser welding, the welding strength is greater than or equal to 130 MPa, the concentricity is less than or equal to 0.05 mm, and the thermal deformation caused by arc welding is avoided; the inner surface of the body is plated with chromium (5-10 microns, hardness greater than or equal to HV800, and no corrosion after 600 hours of salt spray test), and the flow director is electrolytically polished to Ra less than or equal to 0.3 microns to reduce the drag; when the inlet pressure is 0.5 MPa, the outlet flow rate of the nozzle is significantly higher than that of the traditional nozzle; after 5000 hours of operation, the wear of the flow director is less than or equal to 0.02 mm, the nozzle is suitable for bladeless turbine power input and jet propulsion systems, and the nozzle can directly replace the existing nozzle without modifying the pipeline.

Description

Technical Field

[0001] This utility model relates to the field of fluid jet technology, and more specifically to the structural optimization and vortex enhancement design of a self-pressurizing nozzle. It is particularly suitable for fluid machinery scenarios with clear requirements for "high vortex intensity, high flow velocity, and long life" such as airflow drive without blades and thrust enhancement of jet propulsion systems. It is directly compatible with existing fluid pipeline interfaces. Background Technology

[0002] In the field of fluid jet technology, the nozzle is the core component of the fluid jet system, and its performance directly determines the kinetic energy and vortex characteristics of the fluid. However, existing technologies have three major drawbacks:

[0003] 1. Insufficient vortex intensity: Traditional straight or conical nozzles mainly produce axial flow, resulting in low vortex intensity and energy conversion efficiency of less than 65%; Existing nozzles with guide vanes have large helix angle tolerances and lead errors exceeding 1mm, with vortex enhancement efficiency of only 15%, which cannot meet the high vortex requirements of bladeless turbines.

[0004] 2. Poor structural stability: Most of them use arc welding to fix the flow guide, and the weld strength is low (≤100MPa). They are easy to loosen in high temperature or vibration environment, and the concentricity deviation exceeds 0.1mm, which leads to flow field distortion and an additional efficiency loss of 8%-10%.

[0005] 3. Insufficient corrosion resistance and drag reduction: The inner surface of the main body is mostly ordinary polished, resulting in high resistance along the way; there is no special corrosion-resistant coating, and rust will appear in a short period of time (300 hours) in humid or salty environments, shortening the service life by 50%, making it unsuitable for marine transportation and high-humidity industrial scenarios.

[0006] Therefore, how to provide a self-pressurizing nozzle with a spiral guide through a collaborative design of "spiral guide optimization (solving weak eddy current) + laser welding process innovation (solving structural looseness) + corrosion-resistant and drag-reducing coating (solving poor corrosion resistance)" to achieve a significant increase in outlet flow rate, eddy current enhancement efficiency ≥23%, and meet the requirements of long-term salt spray resistance (600 hours) and low wear (5000 hours) is a problem that urgently needs to be solved by those skilled in the art.

[0007] Beneficial effects

[0008] 1. Dual improvement in flow velocity and vortex: Under medium inlet pressure (0.5MPa), the outlet flow velocity reaches about 90m / s and the vortex intensity is 1800r / min, which is significantly improved compared with traditional nozzles and can meet the inlet flow velocity requirements of bladeless turbines.

[0009] 2. Strong structural stability: Laser welding has high weld strength and small concentricity error. After long-term vibration testing (10-2000Hz, 10g), the flow guide does not loosen and its service life is 3 times longer than that of arc welding structure.

[0010] 3. Excellent corrosion resistance: The chrome plating layer showed no corrosion after 600 hours of salt spray testing, and the main body has a service life of over 8,000 hours in humid environments, which is twice that of uncoated nozzles;

[0011] 4. Industrialization advantages: Standardized parameters for each process step (such as welding power and polishing current), mass production yield ≥96%, and production cost reduced by 25% compared to customized nozzles. Utility Model Content

[0012] In view of this, this utility model provides a self-pressurizing nozzle with high vortex intensity, fast flow velocity, and stable structure through a synergistic design of "spiral guide optimization (solving weak vortex) + laser welding process innovation (solving loose structure) + corrosion-resistant and drag-reducing coating (solving poor corrosion resistance)", achieving a significant increase in outlet flow velocity and vortex enhancement efficiency ≥23%, while meeting the requirements of long-term salt spray resistance (600 hours) and low wear (5000 hours).

[0013] To achieve the above objectives, this utility model provides the following technical solution:

[0014] This utility model discloses a self-pressurizing nozzle with a spiral guide, comprising a brass body, a spiral guide, a chrome-plated layer, and a connecting flange.

[0015] Preferably, the inlet and outlet diameters of the brass body are adapted to the mainstream pipeline.

[0016] Preferably, the spiral guide is embedded inside the brass body and is fixed to the brass body by fiber laser welding. The spiral guide is composed of spiral blades.

[0017] Preferably, the inner surface of the brass body is plated with hard chrome.

[0018] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a self-pressurizing nozzle with high vortex intensity, fast flow velocity, and stable structure through the synergistic design of "spiral guide optimization (solving weak vortex) + laser welding process innovation (solving loose structure) + corrosion-resistant and drag-reducing coating (solving poor corrosion resistance)", which achieves a significant increase in outlet flow velocity, vortex enhancement efficiency ≥23%, and meets the requirements of long-term salt spray resistance (600 hours) and low wear (5000 hours). Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 The attached figure is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 The attached figure is a cross-sectional structural schematic diagram of this utility model.

[0022] Figure 3 The attached figure is a schematic diagram of the spiral guide structure of this utility model.

[0023] Figure 4 The attached figure is a cross-sectional view of the overall structure of the self-pressurizing nozzle of this utility model.

[0024] Figure 5 The attached figure is a three-dimensional structural schematic diagram of the spiral guide of this utility model.

[0025] Figure 6 The attached figure is a graph showing the relationship between eddy current intensity and helix angle of this invention.

[0026] Legend

[0027] 1. Brass casing, 2. Spiral guide, 21. Spiral blades, 3. Chrome plating, 4. Connecting flange. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] A self-pressurizing nozzle with a spiral guide includes: a brass body 1, a spiral guide 2, a chrome-plated layer 3, and a connecting flange 4.

[0030] The brass body 1 is made of H62 brass material, with inlet and outlet diameters adapted to mainstream pipelines, length 50mm-100mm, wall thickness 3mm-5mm, and precision machined by CNC lathe (accuracy ±0.01mm).

[0031] The spiral guide is embedded inside the outlet of the brass main body and is made of stainless steel. It has a spiral angle of 22.5°±0.5° and a lead of 25mm±0.1mm, with the angle between the guide and the flow channel axis adapted to the eddy current enhancement requirements. The surface of the guide is electrolytically polished to Ra≤0.3μm. The spiral guide is fixed to the brass main body by fiber laser welding, with a welding power of 500W-800W, a speed of 10mm / s-15mm / s, a weld width of 0.8mm-1.2mm, a weld strength ≥130MPa (room temperature tensile test), and a concentricity ≤0.05mm. The electrolytic polishing process of the spiral guide employs… A mixed polishing slurry of phosphoric acid and sulfuric acid was used, with optimized parameters for polishing temperature, current density, and time to ensure a surface roughness Ra ≤ 0.3 μm. The fiber laser welding machine used a wavelength of 1064 nm and a spot diameter of 0.2 mm-0.5 mm. After welding, the weld was inspected using a metallographic microscope (100× magnification), and no porosity or cracks were found. After 5000 hours of continuous spraying testing (compressed air medium), the wear of the spiral guide was ≤ 0.02 mm, and the eddy current intensity attenuation was ≤ 3%. The lead error of the spiral guide was ≤ 0.1 mm, and the cumulative error of the spiral angle was ≤ ± 0.5°, as measured by a high-precision coordinate measuring machine.

[0032] The inner surface of the brass body is plated with hard chrome, with a coating thickness of 5μm-10μm, a hardness ≥HV800, and an electroplating current density of 20A / dm. 2 -30A / dm 2 Temperature 50℃-60℃, time 30min-60min; chromium plating layer shows no corrosion after 600 hours of salt spray test, adhesion ≥50N / cm (cross-cut test); at inlet pressure 0.5MPa, the nozzle's vortex enhancement efficiency ≥23%.

[0033] Example 1

[0034] 1. Component preparation: ① Brass body: H62 brass material is machined to the preset size by CNC lathe, and the inner surface is chrome plated to 5μm-10μm with a roughness Ra≤0.4μm; ② Flow guide: Stainless steel is wire cut and electrolytic polished with a helix angle of 22.5°, a lead of 25mm, and a surface roughness ≤0.3μm; ③ Welding: Welded using a fiber laser welding machine with optimized parameters, the weld strength is ≥130MPa, and the concentricity is ≤0.05mm;

[0035] 2. Performance Testing: ① High Pressure Test: At an inlet pressure of 0.5 MPa, the outlet flow velocity reaches approximately 90 m / s, the eddy current intensity is 1800 r / min, and the pressure loss is controlled at approximately 2.1%; ② Salt Spray Test: After 600 hours of salt spray testing, the chrome plating layer shows no corrosion, and the adhesion remains stable; ③ Long-Term Test: After 5000 hours of continuous spraying, the guide vane wear is ≤0.02 mm, and the eddy current intensity decreases by ≤3%.

[0036] Example 2

[0037] The performance was tested by changing the helix angle (keeping the lead constant at 25 mm). The results showed that when the helix angle was around 22.5°, the eddy current enhancement efficiency was the highest (23%), and the balance between flow velocity and structural stability was the best. When the helix angle was too small or too large, the eddy current intensity or flow velocity would decrease, which verified the rationality of the optimized parameters.

[0038] This utility model provides a self-pressurizing nozzle with high vortex intensity, fast flow velocity, and stable structure through a synergistic design of "spiral guide optimization (solving weak vortex) + laser welding process innovation (solving loose structure) + corrosion-resistant and drag-reducing coating (solving poor corrosion resistance)". It achieves a significant increase in outlet flow velocity and vortex enhancement efficiency ≥23%, while meeting the requirements of long-term salt spray resistance (600 hours) and low wear (5000 hours).

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-pressurizing nozzle with a spiral guide, characterized in that, include: Brass body (1), spiral guide (2), chrome plating (3) and connecting flange (4).

2. The self-pressurizing nozzle with a spiral guide according to claim 1, characterized in that, The inlet and outlet diameters of the brass body (1) are adapted to the mainstream pipeline.

3. The self-pressurizing nozzle with a spiral guide according to claim 1, characterized in that, The spiral guide (2) is embedded inside the brass body (1). The spiral guide (2) is fixed to the brass body (1) by fiber laser welding. The spiral guide (2) is composed of spiral blades (21).

4. The self-pressurizing nozzle with a spiral guide according to claim 1, characterized in that, The inner surface of the brass body (1) is plated with hard chrome.

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