Low-noise and high-efficiency marine fan

Abstract

The utility model discloses a low -noise high -efficient marine fan, including fan, fan is installed in fan support, and the fan top is installed with silencer, impeller, explosion -proof motor, the bottom of fan inner tube is installed with short cone cylinder, is equipped with the heat dissipation hole on short cone cylinder, and the impeller of fan is equipped with sawtooth segment. The blade length of impeller is L, and the sawtooth shape structure length is 0.5L, and the starting point of sawtooth type structure is located at 1 / 3L away from the blade import, and the terminal point of sawtooth type structure is located at 1 / 6L away from the blade export. The best implementation scheme is that the impeller installation angle is 35 DEG, and the guide vane installation angle is 38 DEG. The technical scheme of the utility model effectively reduces the noise through the silencer, and the heat dissipation hole strengthens the heat dissipation, and simultaneously combines explosion -proof motor, explosion -proof control box, explosion -proof impeller etc. to reduce the explosion possibility, and the fan whole result is simple light weight, and can effectively guarantee the fan operation stability.

Description

Technical Field

[0001] This utility model relates to the field of marine fan technology. Background Technology

[0002] Currently, ventilation fans operate on the principle of increasing gas pressure and discharging gas using input mechanical energy; they are a type of driven fluid machinery. During operation, existing fans generate significant noise due to vibrations from the motor's startup and the accelerated gas flow from the impeller. This noise significantly impacts operator comfort in the workshop, potentially causing ear damage and affecting their health over time. Traditional fan designs prioritize aerodynamics, corrosion resistance, and fire resistance, paying relatively little attention to aerodynamic noise. However, with societal development and increasingly stringent environmental requirements, ventilation fans are particularly problematic. Furthermore, fans handle large volumes of low- to medium-pressure air. When converting external airflow, the fan collects air through its casing, but this collected air disperses rapidly inside the fan. This prevents the fan from fully utilizing the concentrated airflow during rotation, increasing energy consumption and reducing efficiency. In existing technologies, the impeller assembly is the main component of the fan. The blades in the impeller assembly are the parts that transfer energy to the fluid. Traditional fans use motors to directly drive plate blades for ventilation, which makes the fan pressure characteristic curve change linearly. This results in greater noise when the fan 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 this utility model is to provide a low-noise, high-efficiency fan that is safer, quieter, and more energy-efficient.

[0004] The technical solution adopted in this utility model is a low-noise and high-efficiency marine fan, including a fan, the fan is installed on a fan bracket, a silencer, an impeller, and an explosion-proof motor are installed on the top of the fan;

[0005] A short cone is installed at the bottom of the inner cylinder of the fan, and a heat dissipation device is provided on the short cone.

[0006] The impeller of the fan has a serrated section.

[0007] The heat dissipation device on the short cone consists of a set of heat dissipation holes. The heat dissipation holes are elongated and 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.

[0008] The impeller blades are L in length, and the serrated structure is 0.5L in length. The starting point of the serrated structure is located at 1 / 3L from the blade inlet, and the ending point of the serrated structure is located at 1 / 6L from the blade outlet.

[0009] The optimal implementation is an impeller installation angle of 35° and a guide vane installation angle of 38°.

[0010] Protective nets are installed at both the top and bottom of the fan.

[0011] The beneficial effects of this utility model are that it effectively reduces noise through a silencer, enhances heat dissipation through heat dissipation holes, and reduces the possibility of explosion by combining an explosion-proof motor, an explosion-proof control box, and an explosion-proof impeller. The overall structure of the fan is simple and lightweight, and it can effectively ensure the stability of the fan operation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 for Figure 1 The corresponding left view.

[0014] Figure 3 for Figure 1 The corresponding top view.

[0015] Figure 4 for Figure 1 A partial sectional view along the AA direction.

[0016] Figure 5 This is a schematic diagram of the wind turbine structure.

[0017] Figure 6 This is the top view corresponding to the figure.

[0018] Figure 7 This is a schematic diagram of the impeller structure.

[0019] Figure 8 This is a schematic diagram of the muffler structure.

[0020] Figure 9 This is a schematic diagram of a short conical cylinder structure.

[0021] Figure 10 This is a schematic diagram of the protective netting installation structure.

[0022] The markings in the diagram are as follows: 1-fan, 2-air duct, 3-silencer, 32-conical cover, 33-sound-absorbing cotton, 4-protective net one, 5-protective net two, 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 Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figures 1-4As shown, the low-noise and high-efficiency marine fan of this application includes components such as an explosion-proof fan, a fan bracket, a silencer, a rainproof canopy, an explosion-proof impeller, an explosion-proof motor, and an explosion-proof control box.

[0025] Protective nets are installed at the top and bottom of the fan, and a protective net is also installed above the doorway. Figure 1 and Figure 4 It is known that the system includes protective netting 4 and protective netting 5, with two layers of netting arranged in a combination of one coarse netting and one fine netting to ensure the safety of personnel entering and exiting. Protective netting is also installed at the air outlet to prevent foreign objects from entering, ensuring workplace safety and avoiding accidents. Simultaneously, it prevents debris from clogging the fan outlet and affecting ventilation, and protects the fan from wind damage, preventing the wind generated by the fan from blowing away debris or dust and reducing pollution to the surrounding environment. Therefore, it can extend the fan's service life, improve product stability, and reduce maintenance costs.

[0026] exist Figures 1-4 As can be seen, the air duct is equipped with forklift holes and silencer openings for easy hoisting and transportation. The base air duct is filled with sound-absorbing cotton and perforated galvanized sheet, which serve to keep the air warm, insulate the heat and reduce noise.

[0027] To dissipate heat from the motor, elongated ventilation holes 12 are made in the short conical cylinder 11 at the bottom of the fan inner cylinder. These holes reduce eddies, concentrate airflow, and quickly dissipate the heat generated by the motor, while also allowing cool outside air to flow in, thus providing excellent ventilation and heat dissipation. However, according to conventional design principles, the strength and stability of the short conical cylinder 11 closely affect the motor's lifespan and performance, but poor heat dissipation can also severely impact the motor. Considering both factors, the method and location of the holes in the short conical cylinder 11 are specially designed to ensure maximum heat dissipation without compromising the motor's lifespan and performance. Figure 5 and Figure 9 As shown, the length of the heat dissipation hole 12 is 52mm-62mm, the width is 20-30mm, and the tilt angle is 33°-43°. With the impeller's central axis as a reference, the angle between the length extension direction of the heat dissipation hole and the impeller's central axis is the tilt angle. The optimal solution is a long strip hole with a length of 57mm, a width of 25mm, and a tilt angle of 38°.

[0028] Of course, conventional heat dissipation fins, heat sinks, or water cooling methods can also be used to achieve heat dissipation, but the perforated method has a simple structure, improves airflow, and has a good heat dissipation effect.

[0029] A silencer 3 is installed on top of the fan to reduce noise. The silencer consists of sound-absorbing cotton 33, a conical cover 32, and a shell structure. The conical cover 32 is waterproof and dustproof. The internal sound-absorbing cotton 33 is made of polyester fiber or environmentally friendly glass fiber cotton. Its porous structure effectively captures sound waves and converts them into heat energy, thereby reducing the propagation of sound waves. At the same time, the sound-absorbing cotton material has good sound insulation properties, which can further block the transmission of noise. This can significantly reduce the operating noise of the fan and improve the working environment.

[0030] like Figure 5 , Figure 7 As shown, the impeller 14 of this invention features serrated blades. Serrated blades increase the friction between the air and the blades, allowing the air to rotate more closely to the blades, thus improving efficiency. Simultaneously, the serrated design reduces the air's rotation radius, making the air more concentrated. Because the airflow in the serrated impeller 14 converges earlier after changing from axial to radial, the axial thrust is minimized, thus reducing sensitivity to flow deviation and resulting in smoother impeller operation. Furthermore, the serrated impeller reduces impeller weight by approximately 5% to 15%, reducing bearing load, increasing height, and reducing forced vibration of the rotor, thereby improving the fan's critical speed and reliability. Therefore, it improves both reliability and efficiency, and consequently reduces noise.

[0031] When the length of the serrated impeller blade is L, the optimal length of the serrated structure is 0.5L. Starting near the blade inlet, the serrated structure is positioned at 1 / 3 to 5 / 6 of the blade length. The starting point of the serrated structure is set at 1 / 3L from the blade inlet, and the ending point is set at 1 / 6L from the blade outlet. Based on impact vibration analysis, the impeller installation angle is 35°, resulting in optimal performance. The serrated structure on the outlet edge suppresses laminar boundary layer splitting of the rotating blades and reduces the intensity of the separation vortex, thereby achieving noise reduction.

[0032] The blade width bs and blade angle θs of the guide vanes on the fan; impeller diameter: through a series of calculations based on specific speed and pressure coefficient, the impeller diameter is determined to be 890mm; firstly, the optimal calculation parameter n2 is determined: since the theoretical total pressure coefficient ψt.th of the axial flow fan involved is 0.31, the impeller hub diameter is then determined. 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 are selected with a curved diameter and 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 rotational kinetic energy, while the guide vanes guide the gas flow, controlling the angle and speed of the gas flowing through the impeller, thereby achieving higher efficiency.

[0033] The fan in this application is equipped with an explosion-proof enclosure, which integrates thermal relays, undervoltage protection, leakage protection, phase sequence protection, etc. The explosion-proof enclosure can isolate the equipment from the external environment, prevent sparks and other factors from causing explosions of flammable gases and other substances, and minimize the risk of explosion accidents.

[0034] The fan described in this application, through the design of a silencer and the application of serrated blades, achieves noise reduction compared to traditional fans while ensuring efficient operation. The inclusion of an explosion-proof enclosure and an explosion-proof motor effectively reduces the possibility of explosion accidents.

Claims

1. A low noise and high efficiency marine fan, characterized by: Includes a fan, which is mounted on a fan bracket. A silencer, impeller, and explosion-proof motor are installed on top of the fan. A short cone is installed at the bottom of the inner cylinder of the fan, and a heat dissipation device is provided on the short cone. The impeller of the fan has a serrated section.

2. The low noise and high efficiency marine fan as claimed in claim 1, wherein: The heat dissipation device on the short cone consists of a set of heat dissipation holes. The heat dissipation holes are elongated and 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.

3. The low-noise, high-efficiency marine fan as described in claim 1, characterized in that: The impeller blades have a length of L, and the serrated structure has a length of 0.5L. The starting point of the serrated structure is located at 1 / 3L from the blade inlet, and the ending point of the serrated structure is located at 1 / 6L from the blade outlet.

4. The low-noise, high-efficiency marine fan as described in claim 1, characterized in that: The impeller is installed at an angle of 35°, and the guide vane is installed at an angle of 38°.

5. The low-noise, high-efficiency marine fan as described in claim 1, characterized in that: The fan is equipped with protective nets at both the top and bottom.

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