Silent axial flow fan

Abstract

The utility model discloses a mute type axial flow fan which comprises a machine shell, a sound insulation structure is arranged on the surface of the machine shell, supports are fixedly connected to the front face and the back face of the machine shell respectively, blades located in the machine shell are movably connected to the inner sides of the supports, two through holes are formed in the surface of each blade, and the two through holes are communicated with the through holes. The through holes can flow to the blade low-pressure face through the blade high-pressure face, the blade separation point is promoted to move downwards, the separation area of the blade outlet section is reduced, and the sound insulation structure comprises sound insulation cotton fixedly connected to the surface of the machine shell. According to the utility model, the blades of the fan are modified and upgraded, and a blade perforation method is adopted, so that the vortex noise can be reduced, the air resistance can be well penetrated, and the perforation method enables part of airflow to flow to the low-pressure surfaces of the blades through the high-pressure surfaces of the blades, so that the separation points of the blades move downwards; the separation area of the blade outlet section is reduced, and noise can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of axial flow fan technology, specifically a silent axial flow fan. Background Technology

[0002] Axial flow fans are a common type of ventilation equipment, which are fans in which the airflow direction is the same as the axis of the fan blades. They are called "axial flow" because the gas flows parallel to the fan axis. Their working principle is based on a series of physical and engineering principles, including dynamics, fluid mechanics and gas dynamics.

[0003] According to patent application number 201721845768.4 published on the China Patent Network, entitled "Axial Flow Fan," it includes: two sets of fan blades arranged sequentially in the airflow direction of the axial flow fan, with the two sets of fan blades bending in opposite directions; and a drive assembly connected to the fan blades located on the air outlet side of the axial flow fan to drive their rotation. This utility model's axial flow fan can generate high-pressure axial airflow with no air exchange, and a long air delivery distance, which is beneficial for improving the working efficiency and reducing the noise of the axial flow fan.

[0004] However, the existing gas turbine's internal engine room is noisy when it is working, so an exhaust system is needed to provide sufficient heat dissipation and noise reduction for the gas turbine. The exhaust system includes an exhaust fan, which vibrates and generates noise when it is working. This noise, along with the noise generated by the gas turbine, is transmitted outwards. The noise will have a cumulative effect, resulting in a large amount of noise emitted outwards, which will affect the office and living environment in the plant area.

[0005] Therefore, it is necessary to redesign and modify the silent axial flow fan. Utility Model Content

[0006] To address the problems mentioned in the background art, the purpose of this utility model is to provide a silent axial flow fan that has the advantages of noise reduction and meeting emission standards. It solves the problem that existing gas turbines have high noise levels inside the engine compartment, requiring an exhaust system to provide sufficient heat dissipation and noise reduction. In such exhaust systems, the exhaust fan vibrates and generates noise during operation, which, together with the noise generated by the gas turbine, propagates outward. This noise has a cumulative effect, resulting in significant external noise that affects the office and living environment of the factory area.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a silent axial flow fan, including a casing;

[0008] The surface of the housing is provided with a sound insulation structure. The front and back of the housing are fixedly connected to brackets. The inner side of the brackets is movably connected to blades located inside the housing. The surface of the blades has two through holes. The through holes allow the flow to pass through the high-pressure side of the blades to the low-pressure side of the blades, causing the blade separation point to move downwards and reducing the separation zone of the blade exit section.

[0009] As a preferred embodiment of this invention, the sound insulation structure includes sound insulation cotton fixedly connected to the surface of the casing, and the sound insulation cotton has a plurality of reflective holes inside.

[0010] As a preferred embodiment of this utility model, a barrier sleeve is fixedly connected to the surface of the sound insulation cotton, the barrier sleeve is made of damping material, and a reflective film is fixedly connected to the surface of the barrier sleeve.

[0011] As a preferred embodiment of this utility model, sound-absorbing plates are fixedly connected to both sides of the housing. The sound-absorbing plates are made of damping material, and there are several sound-absorbing plates arranged evenly around the housing.

[0012] As a preferred embodiment of this utility model, a base is fixedly connected to the bottom of the housing, the bottom of the base penetrates the sound insulation structure and extends to the bottom of the sound insulation structure, and rubber plates are fixedly connected to both sides of the bottom of the base, the interior of the rubber plates being hollow.

[0013] As a preferred embodiment of this utility model, an extension plate is fixedly connected to both the left and right sides of the base, and a spring plate is fixedly connected to both ends of the extension plate, with the bottom of the spring plate being flush with the bottom of the base.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. This utility model improves the blades of the fan by modifying and upgrading them using a blade perforation method. This method can reduce eddy noise and allow the air resistance to pass through effectively. The perforation method allows some airflow to flow from the high-pressure side of the blade to the low-pressure side of the blade, causing the blade separation point to move downwards and reducing the separation zone at the blade outlet section, which can effectively reduce noise.

[0016] 2. This utility model, by setting a sound insulation structure on the surface of the casing, including fixedly connected sound insulation cotton and reflective holes opened inside the sound insulation cotton, can effectively absorb and reflect noise, reducing noise transmission. The sound insulation cotton, as the main sound insulation material, can absorb most of the noise energy, while the reflective holes can guide some noise to reflect multiple times inside the sound insulation cotton, further dissipating its energy and improving the sound insulation effect.

[0017] 3. This utility model uses a damping material to fix a barrier sleeve to the surface of the sound insulation cotton, which can further absorb and dissipate noise. The reflective film on the surface of the barrier sleeve can reflect some of the noise back into the sound insulation cotton, increasing the noise consumption path and thus improving the overall sound insulation performance.

[0018] 4. This utility model uses sound-absorbing panels, which are evenly arranged around both sides of the casing and made of damping material, to absorb noise transmitted from inside and outside the casing. The number and arrangement of the sound-absorbing panels have been optimized to ensure the best noise reduction effect and further improve the quietness of the fan.

[0019] 5. The base fixed to the bottom of the casing of this utility model not only provides stable support for the fan, but also extends through the sound insulation structure to the bottom of the sound insulation structure, which helps to reduce the transmission of noise through the base. The hollow rubber plates fixed to both sides of the bottom of the base can absorb and dissipate the vibration and noise generated during the operation of the fan, further reducing the transmission of noise.

[0020] 6. This utility model provides additional shock-absorbing support for the fan through the extension plates fixedly connected to the left and right sides of the base and the elastic plates fixedly connected to both ends. The elastic plates have a certain degree of elasticity, which can further reduce the vibration and noise transmission during the operation of the fan, and ensure the stable operation and quiet performance of the fan. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0023] Figure 3 This is a top view of the structure of this utility model;

[0024] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0025] In the diagram: 1. Housing; 2. Sound insulation structure; 3. Bracket; 4. Blade; 5. Through hole; 6. Sound insulation cotton; 7. Reflective hole; 8. Barrier sleeve; 9. Reflective film; 10. Sound-absorbing panel; 11. Base; 12. Rubber plate; 13. Extension plate; 14. Spring plate. Detailed Implementation

[0026] 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.

[0027] like Figures 1 to 4 As shown, the present invention provides a silent axial flow fan, including a casing 1;

[0028] The surface of the housing 1 is provided with a sound insulation structure 2. The front and back of the housing 1 are fixedly connected with brackets 3. The inner side of the brackets 3 is movably connected with blades 4 located inside the housing 1. Two through holes 5 are opened on the surface of the blades 4. The through holes 5 can flow from the high pressure side of the blades 4 to the low pressure side of the blades 4, causing the separation point of the blades 4 to move downward and reducing the separation zone of the outlet section of the blades 4.

[0029] refer to Figure 2 The sound insulation structure 2 includes sound insulation cotton 6 fixedly connected to the surface of the housing 1, and the sound insulation cotton 6 has several reflective holes 7 inside.

[0030] As a technical optimization of this utility model, by setting a sound insulation structure 2 on the surface of the casing 1, including a fixedly connected sound insulation cotton 6 and a reflective hole 7 opened inside the sound insulation cotton 6, noise can be effectively absorbed and reflected, reducing noise propagation. The sound insulation cotton 6, as the main sound insulation material, can absorb most of the noise energy, while the reflective hole 7 can guide some noise to reflect multiple times inside the sound insulation cotton 6, further dissipating its energy and improving the sound insulation effect.

[0031] refer to Figure 3 The surface of the sound insulation cotton 6 is fixedly connected to the barrier sleeve 8, which is made of damping material, and the surface of the barrier sleeve 8 is fixedly connected to the reflective film 9.

[0032] As a technical optimization of this utility model, the barrier sleeve 8, which is fixedly connected to the surface of the sound insulation cotton 6 and is made of damping material, can further absorb and dissipate noise. The reflective film 9 on the surface of the barrier sleeve 8 can reflect some of the noise back into the sound insulation cotton 6, increasing the noise consumption path and thus improving the overall sound insulation performance.

[0033] refer to Figure 1 Both sides of the housing 1 are fixedly connected with sound-absorbing panels 10. The sound-absorbing panels 10 are made of damping material, and there are several sound-absorbing panels 10 arranged evenly around each other.

[0034] As a technical optimization of this utility model, the sound-absorbing panels 10, which are evenly arranged around both sides of the housing 1 and are made of damping material, can absorb noise transmitted from inside and outside the housing 1. The number and arrangement of the sound-absorbing panels 10 have been optimized to ensure the best noise reduction effect and further improve the quiet performance of the fan.

[0035] refer to Figure 4 The bottom of the housing 1 is fixedly connected to a base 11. The bottom of the base 11 passes through the sound insulation structure 2 and extends to the bottom of the sound insulation structure 2. Rubber plates 12 are fixedly connected to both sides of the bottom of the base 11. The interior of the rubber plates 12 is hollow.

[0036] As a technical optimization of this utility model, the base 11 fixed to the bottom of the housing 1 not only provides stable support for the fan, but also extends through the sound insulation structure 2 to the bottom of the sound insulation structure 2, which helps to reduce the transmission of noise through the base 11. The hollow rubber plates 12 fixedly connected to both sides of the bottom of the base 11 can absorb and dissipate the vibration and noise generated during the operation of the fan, further reducing the transmission of noise.

[0037] refer to Figure 4 An extension plate 13 is fixedly connected to both the left and right sides of the base 11. A spring plate 14 is fixedly connected to both ends of the extension plate 13. The bottom of the spring plate 14 is flush with the bottom of the base 11.

[0038] As a technical optimization of this utility model, the extension plates 13 fixedly connected to the left and right sides of the base 11 and the elastic plates 14 fixedly connected to both ends provide additional shock absorption support for the fan. The elastic plates 14 have a certain elasticity, which can further reduce the vibration and noise transmission during the operation of the fan, and ensure the stable operation and quiet performance of the fan.

[0039] The working principle and usage process of this utility model are as follows: When the silent axial flow fan is powered on, the motor starts working, driving the blades 4 to rotate inside the casing 1. The rotation of the blades 4 generates airflow, which enters from the inlet end of the casing 1, is accelerated and guided by the blades 4, and exits from the outlet end of the casing 1. The two through holes 5 on the surface of the blades 4 are one of the key design features. These through holes 5 allow the airflow to flow from the high-pressure side of the blades 4 to the low-pressure side. By changing the airflow path, the separation point of the blades 4 is moved downwards, reducing the separation zone at the outlet section of the blades 4 and reducing the eddies of the airflow at the edge of the blades 4. The sound insulation structure 2 on the surface of the casing 1, including sound insulation cotton 6 and reflective holes 7, absorbs and reflects noise. The sound-absorbing panels 10, which are evenly arranged around both sides of the casing 1, are also made of damping material and can absorb noise from inside and outside the casing 1. The base 11 fixed at the bottom of the casing 1 not only supports the entire fan, but also achieves shock absorption through the rubber plate 12 at its bottom. The extension plates 13 fixed on the left and right sides of the base 11 are flush with the bottom of the base 11 through the elastic plates 14 at both ends, providing additional shock absorption support for the fan.

[0040] In summary, this silent axial flow fan, by modifying and upgrading the blades 4 using a perforation method, can reduce eddy noise and allow air resistance to pass through effectively. The perforation method allows some airflow to flow from the high-pressure side of the blades 4 to the low-pressure side, causing the separation point of the blades 4 to move downwards, reducing the separation zone at the outlet section of the blades 4, and thus effectively reducing noise.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mute axial flow fan, comprising a casing (1); characterized in that The surface of the casing (1) is provided with sound insulation structure (2), the front and back of the casing (1) are both fixedly connected with support (3), the inner side of the support (3) is movably connected with blade (4) in the casing (1), the surface of the blade (4) is provided with two through holes (5), the through holes (5) can flow from the high pressure surface of the blade (4) to the low pressure surface of the blade (4), so as to make the blade (4) separation point move to the flow below, reduce the separation area of the blade (4) outlet section.

2. The silent axial flow fan according to claim 1, characterized in that: The sound insulation structure (2) comprises sound insulation cotton (6) fixedly connected to the surface of the casing (1), and a plurality of reflection holes (7) are formed in the sound insulation cotton (6).

3. The silent axial flow fan according to claim 2, wherein: The surface of the sound insulation cotton (6) is fixedly connected with a blocking sleeve (8), the material of the blocking sleeve (8) is damping material, and the surface of the blocking sleeve (8) is fixedly connected with a reflecting film (9).

4. The silent axial fan according to claim 1, characterized in that: The both sides of the casing (1) are fixedly connected with sound absorption plates (10), the material of the sound absorption plates (10) is damping material, the number of the sound absorption plates (10) is several and they are uniformly arranged in a ring.

5. The silent axial fan according to claim 1, characterized in that: The bottom of the casing (1) is fixedly connected with a base (11), the bottom of the base (11) penetrates through the sound insulation structure (2) and extends to the bottom of the sound insulation structure (2), the both sides of the bottom of the base (11) are fixedly connected with rubber plates (12), and the inside of the rubber plates (12) is hollow.

6. A silent axial fan according to claim 5, characterized in that: The left side and the right side of the base (11) are both fixedly connected with extension plates (13), the both ends of the extension plates (13) are both fixedly connected with elastic plates (14), and the bottom of the elastic plates (14) is flush with the bottom of the base (11).

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