Low-noise and high-efficiency marine fan

Abstract

The low-noise and high-efficiency marine fan comprises a fan body, the fan body is installed on a fan support, and a silencer, an impeller and an explosion-proof motor are installed above the fan body; a short conical cylinder is mounted at the bottom of the fan inner cylinder, and heat dissipation holes are formed in the short conical cylinder; and a sawtooth section is arranged on an impeller of the fan. The blade length of the impeller is L, the length of the sawtooth-shaped structure is 0.5 L, the starting point of the sawtooth-shaped structure is arranged at the position 1 / 3 L away from the blade inlet, and the end point of the sawtooth-shaped structure is arranged at the position 1 / 6 L away from the blade outlet. According to the optimal implementation scheme, the mounting angle of the impeller is 35 degrees, and the mounting angle of the guide vane is 38 degrees. According to the technical scheme, noise is effectively reduced through the silencer, heat dissipation is enhanced through the heat dissipation holes, meanwhile, the explosion-proof motor, the explosion-proof control box, the explosion-proof impeller and the like are combined to reduce the explosion possibility, the draught fan is simple in overall structure and light in weight, and meanwhile the operation stability of the draught fan can be effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of marine fans. Background Art

[0002] The principle of current ventilators is to use input mechanical energy to increase gas pressure and discharge the gas. They are driven fluid machines. During operation, existing fans generate considerable noise due to vibrations generated by the motor starting up and the accelerated gas flow caused by the rotation of the impeller. The noise generated by the fan significantly affects the operator's normal use in the workshop and can easily damage the ears over time, affecting the operator's health. Traditional fan design focuses on aerodynamics, corrosion resistance, and fire prevention, with relatively little attention paid to fan aerodynamic noise. As society develops, environmental requirements are also increasing. Furthermore, fans are designed to handle large air flows at low and medium pressures. When converting external wind force, the fan collects the wind through the fan casing, and the collected wind quickly disperses inside the fan. This prevents the fan from fully utilizing the concentrated wind force during rotation, increasing energy consumption and reducing fan efficiency. In the existing technology, the impeller group is the main component of the fan, and the blades in the impeller group are the parts that transfer energy to the fluid. Traditional fans use motors to directly drive plate fan blades for ventilation, which makes the fan pressure characteristic curve change linearly. This will cause the fan to generate more noise when the ventilation volume is increased. Therefore, we need to design a low-noise and high-efficiency marine fan. Summary of the Invention

[0003] The technical problem solved by the present invention is to provide a low-noise and high-efficiency fan with higher safety, low noise and high energy efficiency.

[0004] The technical solution adopted by the present invention is a low-noise and high-efficiency marine fan, comprising a fan, the fan being mounted on a fan bracket, a muffler, an impeller, and an explosion-proof motor being mounted above the fan; A short cone is installed at the bottom of the fan inner cylinder, and a heat dissipation device is installed on the short cone; The impeller of the fan is provided with a serrated section.

[0005] The heat dissipation device on the short cone tube is a group of heat dissipation holes. The heat dissipation holes are long strips. The angle between the heat dissipation holes and the vertical direction is 33° to 43°. The heat dissipation holes are evenly distributed on the short cone tube.

[0006] The blade length of the impeller is L, the length of the sawtooth structure is 0.5L, the starting point of the sawtooth structure is set at 1 / 3L from the blade inlet, and the end point of the sawtooth structure is set at 1 / 6L from the blade outlet.

[0007] The best implementation scheme is that the impeller installation angle is 35° and the guide vane installation angle is 38°.

[0008] Protective nets are installed at both ends of the fan.

[0009] The beneficial effects of the present invention are that the noise is effectively reduced through the silencer, the heat dissipation holes enhance the heat dissipation, and at the same time, the explosion possibility is reduced by combining the explosion-proof motor, explosion-proof control box, explosion-proof impeller, etc. The overall result of the fan is simple and lightweight, and the operation stability of the fan can be effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] Figure 2 for Figure 1 Corresponding left view.

[0012] Figure 3 for Figure 1 Corresponding top view.

[0013] Figure 4 for Figure 1 Partial cross-sectional view along AA direction.

[0014] Figure 5 Schematic diagram of the fan structure.

[0015] Figure 6 The top view corresponding to the figure.

[0016] Figure 7 Schematic diagram of the impeller structure.

[0017] Figure 8 Schematic diagram of the muffler structure.

[0018] Figure 9 Schematic diagram of the short cone structure.

[0019] Figure 10 This is a schematic diagram of the protective net installation structure.

[0020] The markings in the figure are: 1-fan, 2-air duct, 3-muffler, 32-conical cover, 33-silencer cotton, 4-protective net 1, 5-protective net 2, 6-sound-absorbing cotton, 11-short cone, 12-heat dissipation hole, 13-explosion-proof motor, 14-impeller, 15-explosion-proof box, 16-guide vane, 17-blade, 18-shell assembly welding, 71-flange. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] like Figures 1-4 As shown, the low-noise and high-efficiency marine fan of the present application includes an explosion-proof fan, a fan bracket, a muffler, a rainproof canopy, an explosion-proof impeller, an explosion-proof motor, an explosion-proof control box and other components.

[0023] Install protective nets at the upper and lower ends of the fan, and install protective nets above the entrance and exit doors. Figure 1 and Figure 4 It can be seen that the protective net includes a protective net 1 4 and a protective net 2 5. The two layers of nets are arranged in a manner of matching a layer of coarse net and a layer of fine net to ensure the safety of people entering and leaving; a protective net is installed at the air outlet to prevent foreign objects from entering, ensure the safety of the workplace, and avoid accidents; at the same time, it prevents debris from clogging the fan outlet and affecting the ventilation effect; and protects the fan from being damaged by wind, preventing the wind generated by the fan from blowing away debris or dust, and reducing pollution to the surrounding environment; for this reason, the service life of the fan can be extended, the stability of the product can be improved, and the maintenance cost can be reduced.

[0024] exist Figures 1-4 As can be seen, the air duct is equipped with a forklift hole and a round hole for the silencer, which is convenient for lifting and transportation. The base air duct is equipped with silencer cotton and porous galvanized plate to keep warm, insulate and reduce noise.

[0025] In order to dissipate heat from the motor, a long strip of heat dissipation holes 12 are opened on the short cone 11 at the bottom of the inner tube of the fan. By punching holes, eddy currents can be reduced, wind can be gathered, and the heat generated by the motor can be quickly dissipated. Cold air from the outside can also flow in, which plays a good role in ventilation and heat dissipation. However, according to conventional design ideas, the strength and stability of the short cone 11 will closely affect the service life and performance of the motor, but poor heat dissipation will also have a serious impact on the motor. After comprehensively weighing the two factors, the method and position of punching holes in the short cone 11 are specially designed to ensure maximum heat dissipation without affecting the service life and performance of the motor. Figure 5 and Figure 9 As shown, the heat dissipation hole 12 has a length of 52mm-62mm, a width of 20-30mm, and an inclination angle of 33°-43°. The angle between the length of the heat dissipation hole and the impeller centerline is the inclination angle. The optimal solution is a strip hole with a length of 57mm, a width of 25mm, and an inclination angle of 38°.

[0026] Of course, in order to achieve the heat dissipation function, conventional heat dissipation teeth, heat dissipation plates or water cooling can also be used for heat dissipation, but the punching method has a simple structure, improves airflow, and has a good heat dissipation effect.

[0027] A muffler 3 is installed on top of the fan to reduce noise. It features a sound-reducing cotton 33, a conical cover 32, and a housing. The conical cover 32 is waterproof and dustproof, while the internal sound-reducing cotton 33 is made of polyester fiber or environmentally friendly glass fiber. Its porous structure effectively captures sound waves and converts them into heat, thereby reducing their propagation. The sound-reducing cotton also offers excellent sound insulation, further blocking the spread of noise. This significantly reduces fan operating noise and improves the working environment.

[0028] like Figure 5 、 Figure 7 As shown, the blades of the impeller 14 of the present invention are designed to be serrated. The serrated blades increase the friction between the air and the blades, allowing the air to rotate more closely against the blades, thereby improving efficiency. The serrated design also reduces the air's rotation radius, concentrating the air more closely. The serrated impeller 14 significantly reduces axial thrust because the airflow converges earlier after transitioning from axial to radial directions. This reduces sensitivity to biased flow, resulting in smoother operation of the impeller. Furthermore, the serrated impeller can reduce impeller weight by approximately 5% to 15%, reducing bearing loads, increasing height, and reducing forced vibration of the rotor, thereby increasing the critical speed and safety and reliability of the fan. This improves reliability while also increasing efficiency and, in turn, reducing noise.

[0029] When the length of the serrated impeller blade is L, the optimal serrated structure length is 0.5L. Starting near the blade inlet, the serrated structure is positioned between 1 / 3 and 5 / 6 of the blade length. The serrated structure begins at 1 / 3L from the blade inlet and ends at 1 / 6L from the blade outlet. Analysis of impact vibrations indicates that optimal performance is achieved when the impeller is mounted at a 35° angle. The serrated structure on the outlet edge suppresses laminar boundary layer diversion of the rotating blades, reducing the intensity of the separation vortex and achieving noise reduction.

[0030] The blade width bs and blade angle θs of the fan's guide vanes; impeller diameter: Through a series of calculations of specific speed and pressure coefficient, the impeller diameter was determined to be 890mm; first, the optimal calculation parameter n2 was determined: because the theoretical total pressure coefficient of the axial flow fan involved is ψt.th = 0.31, the impeller hub diameter was determined. The number of rear guide vanes zs: The aspect ratio of the rear guide vanes should be slightly larger than that of the impeller blades; through a series of calculations, the guide vanes were selected to be curved and variable, with an installation angle of 38°. The impeller and guide vanes work together to convert fluid kinetic energy into mechanical energy. The impeller is a rotating component responsible for converting high-speed airflow into the kinetic energy of rotational motion, while the guide vanes guide the gas flow, controlling the angle and speed of gas flowing through the impeller to achieve higher efficiency.

[0031] The fan of this application is equipped with an explosion-proof box, which integrates a thermal relay, undervoltage protection, leakage protection, phase sequence protection, etc. The explosion-proof box can isolate the equipment from the external environment, preventing factors such as sparks from triggering explosions of flammable gases and other substances, thereby minimizing explosion accidents.

[0032] The fan of the present application, through the design of the silencer and the application of serrated blades, has a noise reduction effect on traditional fans while ensuring the efficient operation of the fan. The provision of explosion-proof boxes and explosion-proof motors effectively reduces the possibility of explosion accidents.

Claims

1. A low-noise and high-efficiency marine fan, characterized by: Including a fan, the fan is installed on the fan bracket, and a muffler, impeller and explosion-proof motor are installed above the fan; A short cone is installed at the bottom of the fan inner cylinder, and a heat dissipation device is installed on the short cone; The impeller of the fan is provided with a serrated section.

2. The low-noise, high-efficiency marine fan according to claim 1, characterized in that: The heat dissipation device on the short cone tube is a group of heat dissipation holes. The heat dissipation holes are long strips. The angle between the heat dissipation holes and the vertical direction is 33° to 43°. The heat dissipation holes are evenly distributed on the short cone tube.

3. The low-noise, high-efficiency marine fan according to claim 1, characterized in that: The blade length of the impeller is L, the length of the sawtooth structure is 0.5L, the starting point of the sawtooth structure is set at 1 / 3L from the blade inlet, and the end point of the sawtooth structure is set at 1 / 6L from the blade outlet.

4. The low-noise, high-efficiency marine fan according to claim 1, characterized in that: The impeller installation angle is 35°, and the guide vane installation angle is 38°.

5. The low-noise, high-efficiency marine fan according to claim 1, characterized in that: Protective nets are installed at both the upper and lower ends of the fan.

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