Axial flow fan with noise reduction device

Abstract

The utility model discloses an axial flow fan with a noise reduction device. The axial flow fan comprises a transition plate, an axial flow fan body, a supporting frame, a foaming aluminum plate, a protective cover and a ventilation plate. The protective cover covers the transition plate to form a cavity, and an axial flow fan, a supporting frame and a foaming aluminum plate are arranged in the cavity; the axial flow fan is installed on the transition plate, the ventilation plate is installed at the bottom of the protective cover, the supporting frame is installed on the transition plate, the foaming aluminum plate is installed on the supporting frame, forms an annular structure and is attached to the ventilation plate, and the foaming aluminum plate and the ventilation plate form a sound absorption cover. A gap is reserved between the foaming aluminum plate and the protective cover, and an air resonant cavity is formed after the gap is sealed through a sealing medium. According to the axial flow fan with the noise reduction device, the air resonant cavity small hole plate is a through hole type foaming aluminum plate, and the small hole diameter, the porosity and the plate thickness can be selected according to noise reduction index requirements; the air resonant cavity is a sealed cavity, can improve the noise reduction frequency band width and the noise reduction effect, and has the advantages of being compact in structure, high in adaptability, high in maintainability and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of noise control of air-cooled electronic products, in particular to an axial flow fan with a noise reduction device. Background Art

[0002] Forced air cooling technology is low-cost, easy to implement, and highly reliable. It is one of the most widely used and mature thermal control technologies in electronic equipment. With the increasing demand for high-performance military electronic equipment, the heat dissipation power consumption of the whole machine continues to increase. In order to meet the thermal control requirements of reinforced electronic equipment in a +55℃ environment, the air volume of military electronic equipment systems continues to increase, and the noise problem is becoming increasingly prominent, seriously affecting the user's equipment experience and comfort, and has adverse effects on the physical and mental health of operators who work in this environment for a long time. The noise problem has attracted more and more attention from domestic reinforced electronic equipment suppliers, and noise reduction design has become one of the key factors for designers to consider.

[0003] Electronic equipment noise can be divided into aerodynamic noise, mechanical noise, vibration noise and electromagnetic noise. Among them, aerodynamic noise is the noise generated during the gas flow process, mainly including rotation noise and vortex noise. It is composed of discrete peak rotation noise and broadband turbulence noise. It is a discrete frequency superimposed on a broadband, generally 10dB(A)~15dB(A) higher than other noises, and is the main noise source of air-cooled electronic equipment. At present, the measures for controlling fan noise on electronic equipment are as follows: active control technology generally uses low-speed fans or PWM strategies to control fan speed, and reduces aerodynamic noise by reducing fan speed, but there are problems of insufficient heat dissipation capacity or increased system complexity; passive control technology generally uses fan guide covers and silencers, which generally have problems such as complex structure, large size, and inconvenient maintenance.

[0004] Based on the above analysis, how to reduce the aerodynamic noise of the fan of electronic equipment while meeting the heat dissipation requirement is a technical problem that needs to be solved. Utility Model Content

[0005] The purpose of the utility model is to provide a new axial flow fan with a noise reduction device in view of the shortcomings and deficiencies of the existing axial flow fans with noise reduction devices, such as complex structure, narrow frequency band, large size, and inconvenient maintenance. The utility model has a composite silencer structure of a resonance cavity and a small hole plate structure, which can significantly improve the noise reduction frequency band width and noise reduction effect, and has the characteristics of compact structure, strong adaptability, and strong maintainability.

[0006] The technical solution to achieve the purpose of the utility model is: an axial flow fan with a noise reduction device, the device comprising a transition plate, an axial flow fan body, a support frame, a foamed aluminum plate, a protective cover and a ventilation plate;

[0007] The protective cover is covered in the protective cover to form a cavity, in which the axial flow fan body, the support frame and the foamed aluminum plate are arranged; the axial flow fan body is installed on the transition plate, the ventilation plate is installed on the bottom of the protective cover, the support frame is installed on the transition plate, the foamed aluminum plate is installed on the support frame and forms an annular structure and is attached to the ventilation plate, and the foamed aluminum plate and the ventilation plate form a sound-absorbing cover; a gap is reserved between the foamed aluminum plate and the protective cover, and an air resonance cavity is formed after being sealed by a sealing medium.

[0008] Furthermore, the support frame includes an annular base, and a plurality of support columns installed on the annular base and distributed along a circular direction.

[0009] Furthermore, the foamed aluminum plate is an integrated structure or an assembled structure.

[0010] Furthermore, the foamed aluminum plate is a thin plate type through-hole foamed aluminum.

[0011] Furthermore, the thickness, through-hole diameter and porosity of the foamed aluminum plate are custom-set according to noise reduction index requirements.

[0012] Furthermore, the size of the air resonance cavity is adjustable and can be customized according to the fan noise spectrum and noise reduction index requirements.

[0013] Furthermore, the size of the air resonance cavity is adjusted by adjusting the size of the support frame.

[0014] Furthermore, the device is installed on a computer equipment carrier via the transition plate, and the transition plate structure is adjustable to adapt to different computer equipment carriers.

[0015] Furthermore, the axial flow fan body and the transition plate, and the protective cover and the transition plate are fixed by fastening screws.

[0016] Furthermore, the ventilation plate is a small hole structure.

[0017] Compared with the prior art, the utility model has the following significant advantages:

[0018] (1) The axial flow fan with a noise reduction device proposed in the utility model is a composite sound-absorbing structure of a resonance cavity and a small hole plate structure, with a wide sound absorption frequency band, good sound absorption effect and compact structure.

[0019] (2) The axial flow fan with a noise reduction device proposed in the utility model can adjust the size of the resonance cavity by adjusting the size of the small hole sound absorption cover support plate according to the noise reduction index requirements of each frequency band, so as to meet the noise reduction requirements of different axial flow fans and different electronic equipment.

[0020] (3) The utility model can be used for high-performance reinforced computers and small reinforced servers with air cooling, and can effectively solve the heat dissipation and noise control problems encountered by reinforced electronic equipment in the further development towards high performance. It has great advantages in improving user equipment experience and comfort, etc., and has a wide sound absorption frequency band, good sound absorption effect, and compact structure. It has a good prospect for promotion and application in military fields such as shipboard and vehicle-mounted, and has a good market prospect.

[0021] The utility model is described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A two-dimensional cross-sectional view of an axial flow fan with a noise reduction device in one embodiment.

[0023] Figure 2 An exploded view of a fan noise reduction device in one embodiment. DETAILED DESCRIPTION

[0024] In order to make the purpose and technical solution of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The meaning of "inside" and "outside" in the present invention refers to the direction pointing to the inside of the axial flow fan with the noise reduction device as inside, and the opposite direction as outside, relative to the axial flow fan with the noise reduction device itself, and is not a specific limitation of the present invention.

[0026] The meanings of "upper" and "lower" in the present utility model are: "upper" refers to a high position, which is opposite to "lower", i.e., the upper side; "lower" refers to a low position, which is opposite to "upper", i.e., the lower layer. It is not a specific limitation of the utility model.

[0027] The meaning of “left and right” in the present invention refers to that when the reader is facing the accompanying drawings, the left side of the reader is the left and the right side of the reader is the right, rather than being a specific limitation of the present invention.

[0028] The term “connection” as used in the present invention may refer to a direct connection between components or an indirect connection between components via other components.

[0029] The meaning of "front" and "rear" in the present invention refers to that when a reader is facing the accompanying drawings, the one closer to the reader is the front and the one farther from the reader is the rear, rather than being a specific limitation of the present invention.

[0030] The terms "first", "second", "third", etc. (if any) described in the present invention are used to distinguish between similar elements, and are not necessarily used to describe a specific order or a chronological order. It is to be understood that these terms used in this way are interchangeable under appropriate circumstances, so that the implementation of the subject matter described herein is, for example, capable of operating in an order different from those described or in another order described herein.

[0031] In one embodiment, in combination Figure 1 and Figure 2 , an axial flow fan with a noise reduction device is provided, the device comprising a transition plate 1, an axial flow fan body 2, a support frame 4, a foamed aluminum plate 5, a protective cover 6 and a ventilation plate 7;

[0032] The protective cover 6 is installed on the transition plate 1 to form a cavity, in which the axial fan body 2, the support frame 4 and the foamed aluminum plate 5 are arranged; the axial fan body 2 is installed on the transition plate 1, the ventilation plate 7 is installed at the bottom of the protective cover 6, the support frame 4 is installed in the protective cover 6, the foamed aluminum plate 5 is installed on the support frame 4 and forms an annular structure and is attached to the ventilation plate 7, and the foamed aluminum plate 5 and the ventilation plate 7 form a sound-absorbing cover; a gap is reserved between the foamed aluminum plate 5 and the protective cover 6, and an air resonance cavity 3 is formed after being sealed by a sealing medium.

[0033] The device is a composite silencing structure composed of a foamed aluminum plate, a ventilation plate, and a resonance cavity structure, wherein the foamed aluminum plate and the ventilation plate are used to absorb the medium and high frequency noise of the fan, and the air resonance cavity is used to absorb the medium and low frequency noise of the fan.

[0034] Furthermore, in one of the embodiments, the support frame 4 includes an annular base, and a plurality of support columns installed on the annular base and distributed along a circular direction.

[0035] Preferably, the foamed aluminum plate is adhered to the support frame 4 .

[0036] Furthermore, in one of the embodiments, the foamed aluminum plate 5 is an integrated structure or an assembled structure.

[0037] Furthermore, in one embodiment, the foamed aluminum plate 5 is a thin plate type through-hole foamed aluminum.

[0038] Furthermore, in one of the embodiments, the thickness, through-hole diameter and porosity of the foamed aluminum plate 5 are customized according to the noise reduction index requirements.

[0039] Furthermore, in one of the embodiments, the size of the air resonance cavity 3 is adjustable and can be customized according to the fan noise spectrum and noise reduction index requirements, so as to meet the noise reduction requirements of different axial flow fans and different electronic equipment.

[0040] Furthermore, in one of the embodiments, the size of the air resonance cavity 3 is adjusted by adjusting the size of the support frame 4 .

[0041] Furthermore, in one of the embodiments, the device is installed on a computer equipment carrier via the transition plate 1, and the transition plate 1 has an adjustable structure for adapting to different computer equipment carriers.

[0042] Furthermore, in one of the embodiments, the axial fan body 2 and the transition plate 1, and the protective cover 6 and the transition plate 1 are fixed by, but not limited to, fastening screws.

[0043] Furthermore, in one of the embodiments, the ventilation plate 7 is a small hole structure.

[0044] Furthermore, in one of the embodiments, the sealing medium is 705 glue.

[0045] The utility model can be used for high-performance reinforced computers and small reinforced servers with air cooling, and can effectively solve the heat dissipation and noise control problems encountered in the further development of reinforced electronic equipment towards high performance. It has great advantages in improving user equipment experience and comfort, etc., and has a wide sound absorption frequency band, good sound absorption effect, and compact structure. It has a good prospect for promotion and application in military fields such as shipborne and vehicle-mounted, and has a good market prospect.

[0046] The above shows and describes the basic principles, main features and advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An axial flow fan with a noise reduction device, characterized in that: The device comprises a transition plate, an axial flow fan body, a support frame, a foamed aluminum plate, a protective cover and a ventilation plate; The protective cover is installed on the transition plate to form a cavity, in which the axial flow fan body, support frame and foamed aluminum plate are arranged; the axial flow fan body is installed on the transition plate, the ventilation plate is installed at the bottom of the protective cover, the support frame is installed in the protective cover, the foamed aluminum plate is installed on the support frame and forms an annular structure and is attached to the ventilation plate, and the foamed aluminum plate and the ventilation plate form a sound-absorbing cover; a gap is reserved between the foamed aluminum plate and the protective cover, and an air resonance cavity is formed after being sealed by a sealing medium.

2. The axial flow fan with a noise reduction device according to claim 1, characterized in that: The support frame comprises an annular base and a plurality of support columns installed on the annular base and distributed along an annular direction.

3. The axial flow fan with a noise reduction device according to claim 1, characterized in that: The foamed aluminum plate is an integrated structure or an assembled structure.

4. The axial flow fan with a noise reduction device according to claim 1, characterized in that: The foamed aluminum plate is a thin plate type through-hole foamed aluminum.

5. The axial flow fan with a noise reduction device according to claim 1, characterized in that: The device is installed on a computer equipment carrier through the transition plate, and the transition plate structure is adjustable to adapt to different computer equipment carriers.

6. The axial flow fan with a noise reduction device according to claim 1, characterized in that: The axial flow fan body and the transition plate, and the protective cover and the transition plate are fixed by fastening screws.

7. The axial flow fan with a noise reduction device according to claim 1, characterized in that: The ventilation plate is a small hole structure.

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