Energy-saving concealed low-noise upgrading blade roof ventilation device

Abstract

The utility model belongs to roof ventilation device technical field especially relates to a new -type energy -conserving concealed low noise upgrading blade roof ventilation device, the new -type energy -conserving concealed low noise upgrading blade roof ventilation device includes fan, the fan includes the air cylinder, the air cap that covers on air cylinder, installs motor in the air cylinder inside to and the blade that is connected with motor, the blade is distributed with the hole, the air cylinder bottom is the safety net, the fan around is equipped with three face surrounding sheltered cover, three face surrounding sheltered cover is three connected cover plates, and three cover plates are located fan top and two adjacent side respectively. The utility model provides a new -type energy -conserving concealed low noise upgrading blade roof ventilation device.

Description

Technical Field

[0001] This utility model belongs to the technical field of roof ventilation devices, and in particular relates to a new type of energy-saving, concealed, low-noise upgraded blade roof ventilation device. Background Technology

[0002] In existing industrial rooftop axial flow fan applications, the use of new energy sources and noise reduction / vibration resistance functions is relatively limited and simplified. Currently, most commercially available solar rooftop fans, especially low-power models, are used in residential settings, typically producing tens of watts, which can ensure a relatively stable power supply. However, industrial applications often require rooftop fans with power demands ranging from hundreds to thousands of watts, which current solar technology cannot support independently. Furthermore, existing solar photovoltaic panels installed on industrial plant roofs primarily serve the internal power supply system, and rooftop fans would occupy rooftop installation space, limiting the installation of photovoltaic panels.

[0003] Secondly, regarding noise reduction and vibration damping, there are two main types of products. One type is a specifically designed low-noise product, featuring a large-diameter blade twist design combined with low speed, built-in sound-absorbing guide columns and anti-vortex guide plates, and lightweight all-aluminum materials to achieve noise reduction. The other type involves adding some measures to existing fans, mainly using spring vibration dampers and rubber vibration dampers for vibration isolation, while also using sound-absorbing materials and silencers for noise reduction. However, under high airflow demands, noise reduction measures may limit energy efficiency improvements. Furthermore, vibration damping and noise reduction add-ons increase the risk of failure and maintenance costs.

[0004] Finally, some municipal supporting industrial buildings and factories are located within urban residential areas, close to residential communities. Some residents have expressed dissatisfaction with the noise and visual impact of the fans installed on the factory roofs. While small fans and exhaust devices in civil buildings can be fitted with hoods or louvers for some degree of shielding and decoration, the fans on the roofs of industrial factories are directly exposed to the external environment without any shielding or concealment. Utility Model Content

[0005] The purpose of this application is to provide a novel energy-saving, concealed, low-noise upgraded blade roof ventilation device to solve the technical problems in the prior art.

[0006] The technical solution adopted in this application embodiment to solve the technical problems existing in the prior art is as follows: A novel energy-saving, concealed, low-noise upgraded blade roof ventilation device includes a fan, a fan duct, a hood covering the fan duct, a motor installed inside the fan duct, and blades connected to the motor. The blades have holes distributed on them. The bottom of the fan duct is a safety net. The fan is surrounded by a three-sided shielding cover, which consists of three connected cover plates, located on the top of the fan and two adjacent sides, respectively.

[0007] The embodiments of this application may also employ the following technical solutions: In the aforementioned novel energy-saving, concealed, low-noise upgraded blade roof ventilation device, the motor is further covered with sound-insulating cotton, and the inner wall of the air duct is lined with sound-absorbing cotton.

[0008] In the aforementioned novel energy-saving, concealed, low-noise upgraded blade roof ventilation device, the holes are further distributed in the middle of the blade, with a diameter of 10mm and a spacing of 50mm.

[0009] In the aforementioned novel energy-saving, concealed, low-noise upgraded blade roof ventilation device, the bottom of the fan is further connected to a spring shock absorber by bolts, and the pressure plate of the spring shock absorber is installed on the roof by expansion bolts.

[0010] In the aforementioned novel energy-saving concealed low-noise upgraded blade roof ventilation device, photovoltaic panels are further installed on the top cover plate, sound-absorbing panels are attached to the inner walls of the three cover plates, and the bottom of the cover plates on the sides are fixedly connected to the roof.

[0011] In the aforementioned novel energy-saving, concealed, low-noise upgraded blade roof ventilation device, the photovoltaic panel and the battery are further connected to the controller, and the controller, the photovoltaic complementary conversion controller, the drive power supply, the fan controller and the fan are connected in sequence.

[0012] One or more technical solutions provided in the embodiments of this application have at least the following beneficial effects: 1. This utility model optimizes and improves the fan itself. Since the airflow state on the blade surface has a significant impact on noise generation when the axial fan is running, by setting holes to allow some airflow to pass through the holes, the airflow distribution on the blade surface is changed, the local velocity and pressure gradient of the airflow are reduced, the separation and vortex intensity of the airflow are weakened, thereby reducing the generation of aerodynamic noise and achieving integrated noise reduction and vibration resistance.

[0013] 2. The perforations in this invention are distributed in the middle of the blade, allowing some airflow to flow from the pressure side to the suction side through the small holes, forming a "jet effect." This interferes with turbulent pulsations within the boundary layer, reducing turbulence intensity and thus decreasing broadband noise. If the opening is close to the blade root, "ineffective leakage" may occur due to the low airflow velocity; if it is close to the blade tip, the high-speed airflow passing through the small holes will generate additional jet noise. However, the airflow velocity in the middle position matches the blade rotation speed, achieving a balance between noise reduction and aerodynamic performance. Compared to the potential for tip vortex enhancement caused by blade tip openings or airflow blockage caused by blade root openings, the impact of openings in the middle position on the fan's pressure rise and efficiency is less significant. In addition, the middle position of the blade is not a stress concentration area (the stress is greater at the blade root connection and the high-speed rotation area at the blade tip), making the opening less likely to cause cracks or fractures, especially suitable for long-term high-speed operation.

[0014] 3. This utility model optimizes the connection between the wind turbine foundation and the roof by using spring vibration dampers to isolate the wind turbine from the foundation, reducing the transmission of wind turbine vibration to surrounding structures. The spring vibration dampers of this utility model are made of composite materials, with reinforcing phases such as carbon fiber and graphene added to the spring steel to improve tensile strength and fatigue life; a Teflon coating is added to isolate rainwater, salt spray, and other corrosive media, extending service life in outdoor environments. Sound-absorbing materials (such as glass wool and aluminum foam) are filled into the spring jacket to form a "vibration isolation + noise absorption" composite structure, reducing solid-borne sound transmitted through the damper. This improves corrosion resistance and weather resistance, reduces metal fatigue loss, and provides vibration damping capabilities with a large damping amplitude and torque, as well as the advantages of being anti-slip, corrosion-resistant, and fireproof.

[0015] 4. In addition to selecting a low-noise motor, this invention wraps the motor with sound-insulating cotton, which absorbs some of the high-frequency noise generated during motor operation, thereby reducing the overall noise level of the fan. Increasing the thickness and rigidity of the duct better blocks the sound from propagating outwards from internal sound sources, while also improving the vibration resistance of the outer casing to prevent noise amplification due to its own vibration. Furthermore, adding sound-absorbing materials, such as sound-absorbing cotton, to the inner wall of the duct can absorb noise generated inside the fan, especially mid-to-high frequency noise.

[0016] 5. This utility model features a three-sided surrounding shield around the fan, consisting of two sides and a top surface. The primary purpose of this shield is to block the view from residents, and, in conjunction with internal noise extraction measures, prevent noise from escaping towards them. The remaining two sides are left open to ensure smooth airflow and allow for the full dissipation of excess moisture and heat, meeting the ventilation needs of the industrial plant. Simultaneously, sound-absorbing panels are attached to the inner sides of the three-sided shield, and solar photovoltaic panels are installed on the outer side of the top shield. This design not only conceals the fan, reducing its visual impact on surrounding residents and absorbing some of the noise, but also utilizes clean energy to power the fan. A hybrid power supply mode of "solar power + grid power" is adopted, with the photovoltaic power generation connected to the grid via a controller. Solar power is prioritized, and when insufficient, it automatically switches to grid power, saving energy. Attached Figure Description

[0017] The technical solutions of the embodiments of this application will be further described in detail below with reference to the accompanying drawings. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of this application. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0018] Figure 1 This is a structural schematic diagram of Embodiment 1.

[0019] Figure 2 This is a schematic diagram of the shock absorber structure in Example 1.

[0020] Figure 3 This is a schematic diagram of the blade structure of the wind turbine in Example 1.

[0021] Figure 4 This is a schematic diagram of the fan structure in Example 1.

[0022] Figure 5 This is the topology diagram of the dual power supply for the fan in Example 1.

[0023] In the picture: 1. Roof ventilator; 2. Canopy; 3. Photovoltaic panel; 4. Fan base; 5. Bolts; 6. Spring shock absorber; 7. Shock absorber pressure plate; 8. Expansion bolts; 9. Blade; 10. Hole; 11. Motor; 12. Sound insulation cotton; 13. Sound absorption cotton; 14. Safety net; 15. Wind cap; 16. Air duct. Detailed Implementation

[0024] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0025] Example 1: This embodiment mainly focuses on roof axial flow fans. First, the exhaust volume is calculated based on the required air change rate according to the process specifications. The fan model and number of units are then selected. Based on the building's area and the location of the production area, appropriate locations for the roof fans are determined to ensure uniform and rational airflow organization. After selecting the locations for the roof axial flow fans, fan foundations are installed according to the opening size, and spring vibration dampers 6 are installed on top. The fans are then mounted on the spring vibration dampers 6.

[0026] The inner wall of the air duct 16 is lined with sound-absorbing cotton 13 (polyester fiber cotton), and the outer shell of the motor 11 is wrapped with sound-insulating cotton 12 (glass wool). The middle of the fan blades 9 has evenly distributed circular holes 10 with a diameter of 10mm and a spacing of 50mm. Sound-absorbing panels are installed on the outer side of the fan facing the direction of noise reduction requirements or the prevailing airflow direction.

[0027] Select the rooftop ventilator model and determine its location based on the airflow direction and volume. Determine the direction and location of the shading cover based on the roof's architectural form, structural characteristics, and existing facilities, combined with the prevailing wind direction, surrounding residents, and the sun's direction. Install an integrated, low-noise ventilator with vibration damping at the bottom, then connect it to the roof. Install the shading cover and solar photovoltaic panels, ensuring a reliable connection between the shading cover and the roof. Solar energy storage devices, including batteries, controllers, and inverters, are installed inside the shading cover.

[0028] The specific installation method is as follows: 1. Determine the number of air changes and calculate the exhaust volume based on the nature of the industrial plant and relevant process requirements.

[0029] 2. Select the model and quantity of roof fans based on the exhaust volume, and determine the location of the roof fans based on the characteristics of the factory building, structural requirements and functional layout.

[0030] 3. Determine the direction and location of the shading cover based on the roof's architectural form, structural characteristics, and roof facilities, taking into account the prevailing wind direction, the surrounding residents' situation, and the sun's direction.

[0031] 4. Reserve installation holes for the fan at the selected location and pour the equipment foundation.

[0032] 5. Install an integrated low-noise fan with a shock-absorbing device at the bottom, and then connect it to the roof fan foundation.

[0033] 6. Install the solar shield and solar photovoltaic panels, ensuring a reliable connection between the shield and the roof. Solar energy storage devices, including batteries, controllers, and inverters, should be installed inside the shield.

[0034] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: This embodiment aims to reduce noise generated by the fan's motor, speed, and installation errors. It can significantly reduce axial fan noise, improve operational stability and safety, and reduce the impact on the surrounding environment. Furthermore, it features a simple structure, convenient operation, and significant noise reduction effect, making it suitable for various occasions requiring noise reduction of rooftop axial fans.

[0035] This embodiment includes: the fan blades 9 are provided with holes 10 to reduce eddy noise; spring shock absorbers 6 are installed, with 4 spring shock absorbers evenly distributed and firmly connected to the fan base 4; sound insulation cotton 12 is wrapped around the motor 11 housing to form a continuous sound-absorbing layer and seal the gaps; sound-absorbing cotton 13 is applied to the inner wall of the air duct 16 for sound insulation; and the thickness and rigidity of the fan housing are increased to improve its seismic performance.

[0036] This embodiment designs the installation method of the fan to achieve the application of clean energy, reduce noise and vibration from multiple aspects, provide a certain degree of concealment, and have an aesthetically pleasing appearance. Furthermore, it closely addresses current user feedback and social issues, considering practical usage effects, prioritizing human needs, reducing noise pollution, promoting clean energy, and thus possessing certain social benefits.

[0037] In this embodiment, installing spring vibration dampers 6 can extend the service life of the fan and related equipment, reduce equipment maintenance and replacement costs, reduce failures such as component loosening and wear caused by vibration, ensure normal equipment operation, improve the continuity and stability of production, and also reduce additional noise generated by vibration. Installing surrounding sound-absorbing panels significantly reduces the impact of fan noise on the surrounding environment, improves the acoustic environment of the workplace and surrounding areas, and reduces noise pollution problems. Improvements to the blades, motor, and casing enhance the reliability, accuracy, and stability of fan operation, effectively reducing the overall noise level of the fan, improving the surrounding acoustic environment, and meeting environmental protection and occupational health and safety requirements. The fan's own noise reduction and vibration isolation measures are integrated, reducing installation steps, lowering the probability of failure, and improving construction efficiency.

[0038] In summary, this utility model provides a novel energy-saving, concealed, low-noise upgraded blade roof ventilation device.

[0039] The above embodiments have provided a detailed description of the present invention, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. An energy-saving, concealed, low-noise upgraded blade roof ventilation device, characterized in that: The energy-saving, concealed, low-noise upgraded blade roof ventilation device includes a fan, which includes a duct, a hood covering the duct, a motor installed inside the duct, and blades connected to the motor. The blades have holes distributed on them. The bottom of the duct is a safety net. The fan is surrounded by a three-sided shield, which consists of three connected panels located on the top of the fan and two adjacent sides.

2. The energy-saving, concealed, low-noise upgraded blade roof ventilation device according to claim 1, characterized in that: The motor is covered with sound-insulating cotton, and the inner wall of the air duct is lined with sound-absorbing cotton.

3. The energy-saving, concealed, low-noise upgraded blade roof ventilation device according to claim 1, characterized in that: The holes are distributed in the middle of the blade, with a diameter of 10 mm and a spacing of 50 mm.

4. The energy-saving, concealed, low-noise upgraded blade roof ventilation device according to claim 1, characterized in that: The bottom of the fan is connected to the spring shock absorber by bolts, and the pressure plate of the spring shock absorber is installed on the roof by expansion bolts.

5. The energy-saving, concealed, low-noise upgraded blade roof ventilation device according to claim 1, characterized in that: The top cover is covered with photovoltaic panels, the inner walls of the three covers are attached with sound-absorbing panels, and the bottom of the side covers is fixedly connected to the roof.

6. The energy-saving, concealed, low-noise upgraded blade roof ventilation device according to claim 5, characterized in that: The photovoltaic panel and the battery are connected to the controller, and the controller, the photovoltaic complementary conversion controller, the drive power supply, the fan controller and the fan are connected in sequence.

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