CN210484115U

CN210484115U - Local mining axial-flow fan with resonance type silencer

Info

Publication number: CN210484115U
Application number: CN201921495863.5U
Authority: CN
Inventors: 吴柯; 代元军; 李保华; 李盼雨
Original assignee: 代元军
Current assignee: Shanghai Dianji University
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2020-05-08
Anticipated expiration: 2029-09-10

Abstract

The utility model relates to a mining local axial-flow fan is energy-conserving to fall the technical field of making an uproar, especially relates to the mining local axial-flow fan who installs resonance formula silencer additional, a serial communication port, including perforation structure resonance formula silencer, collection wind ware, I level organism, I level impeller, II level organisms, flame-proof type three-phase asynchronous motor, noise elimination diffusion awl. The utility model provides a pair of install local mining axial-flow fan of resonant silencer additional installs perforation structure resonant silencer additional at the casing outer wall of II grades of organisms of ventilation blower, and the silencer is perforation structure, and simple process, the juice is established in the integration of being convenient for, but large-scale production. Meanwhile, on the premise of ensuring the ventilation performance of the ventilator, the turbulent flow state near the shell is improved, the pneumatic noise of the ventilator is reduced, the flow loss of the ventilator is reduced, the efficiency of the ventilator is improved, and the service life of the ventilator is prolonged.

Description

Local mining axial-flow fan with resonance type silencer

Technical Field

The utility model relates to a technical field that local mining axial-flow fan was energy-conserving to fall makes an uproar especially relates to a install local mining axial-flow fan of resonant silencer additional.

Background

In order to reduce the aerodynamic noise of axial fans, continuous efforts are made in all countries of the world, and with the technological progress and the improvement of the level of mechanical manufacture, the mechanical noise and the electromagnetic noise are gradually reduced, but the aerodynamic noise is not improved obviously. People reduce the noise of the ventilator by different technical means, and the noise reduction of the ventilator is made by changing the shape of the blades in the ventilator and the installation angle of the blades from the most basic mode of installing the sound-proof cover.

The manufacturing principle of the sound-proof cover is simple, the sound-proof cover is widely applied to mechanical noise reduction, but the damping material has certain limitation and is also influenced by temperature and humidity. The aerodynamic characteristics of the axial-flow type ventilator are changed by optimizing the structural parameters of the blades and designing new blades so as to reduce the aerodynamic noise of the axial-flow type ventilator, but the structural parameters of the blades and the design of the new blades change the structural dynamic characteristics of the axial-flow type ventilator, so that the problem becomes complex, the influence factors are increased, and the research difficulty is increased.

The utility model provides an install perforation structure resonance formula silencer additional at the casing outer wall of local mining axial-flow fan's II grades of organisms, the design principle is simple, influences not very to ventilation blower structure dynamic characteristic. The utility model discloses mainly reduce pneumatic noise through installing the resonant silencer of perforation structure additional, with the aperture inflow resonant silencer on the fluid passes through the ventilation blower casing, take place the resonance effect in the resonant cavity to the outside propagation of the energy reduction noise of consumption noise, this kind of resonant silencer of perforation structure is used and is fallen the exploration accumulation experiment and the design experience of the route of making an uproar for the mining axial-flow type ventilation blower of part on the problem of making an uproar.

SUMMERY OF THE UTILITY MODEL

The utility model discloses install perforation structure resonance formula silencer additional at the casing of the mining axial-flow fan of part, compromise the ventilation blower performance and energy-conservation and fall and improve the design to the equipment of making an uproar that falls of ventilation blower under the prerequisite of the cost of controlling as far as possible, reduce the pneumatic noise of ventilation blower, improve the noise at the noise problem of ventilation blower with the energy of resonant form noise reduction in the resonance intracavity.

The utility model provides a pair of install local mining axial-flow fan of resonance formula silencer additional, its casing installs perforation structure resonance formula silencer additional, has the aperture that link up between casing and the silencer in order to let the fluid flow through to the energy of resonant form consumed noise reaches the effect of making an uproar. The specific parameters are as follows: the resonant silencer has the length L =1m, the diameter D =10mm of the small hole, the axial distance D =30mm of the small hole, 12 holes are evenly distributed in the circumferential direction, the total number of the through holes is 396, and the aperture ratio is delta = 1%;

the utility model provides a local mining axial-flow fan with a resonance silencer, which comprises a resonance silencer with a perforated structure, a wind collector, a class I machine body, a class I impeller, a class II machine body, a flame-proof three-phase asynchronous motor and a noise elimination diffusion cone; the wind collector, the I-level body and the II-level body sequentially form a shell of the local mining axial-flow fan, blades of the fan are respectively fixed on the impeller to sequentially form an I-level impeller and an II-level impeller, the I-level impeller is located in the I-level body, the II-level impeller is located in the II-level body, the silencing diffusion cone is located at the rear part of the II-level impeller, the flame-proof three-phase asynchronous motor respectively drives the I-level impeller and the II-level impeller to rotate, and the resonance silencer with the perforation structure is additionally arranged on the outer wall of the II-level body at the position of the II-level.

The utility model provides a pair of install perforation structure resonance formula silencer on the casing outer wall of II grades of organisms of local mining axial-flow fan additional, thereby it makes sound energy by the partial elimination noise reduction to resonate in the resonant cavity of silencer through the fluid in the casing department of ventilation blower. The process is simple, does not need complex treatment means, and is convenient for integrated design. And simultaneously, the utility model discloses have great adjustable space, can carry out the adjustment of structure according to the model needs of difference, also can adjust micropore distribution, size etc. of sound lining, also can survey the main noise frequency of ventilation blower simultaneously, the structure of corresponding design silencer is in order to reach better noise elimination effect. The ventilator with the same model has similar working frequency and structural characteristics, and can be produced in large scale.

Drawings

For a clear explanation of the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a local mining axial-flow fan with a resonance type silencer according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a resonance muffler with a perforated structure according to an embodiment of the present invention;

FIG. 3 is a schematic view of a noise calculation cross section of a local mining axial-flow fan with a resonance muffler;

fig. 4 is a schematic view of the arrangement of noise calculation points of each noise calculation cross section of the local mining axial-flow fan with the resonance type silencer according to the embodiment of the present invention;

fig. 5 is a comparative analysis diagram of the maximum sound pressure level of each noise calculation point on the cross section 1 of the local mining axial-flow fan with the resonance type silencer and the local mining axial-flow fan without the resonance type silencer provided by the embodiment of the present invention.

Description of the drawings: the device comprises a resonance type silencer 1 with a perforated structure, an air collector 2, a first-stage machine body 3, a first-stage impeller 4, a second-stage impeller 5, a second-stage machine body 6, an explosion-proof three-phase asynchronous motor 7 and a silencing diffusion cone 8.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless explicitly stated or limited otherwise, the terms "mounted", "connected" and "connected" are to be understood broadly, and may for example be fixedly connected, detachably connected or integrally connected; either mechanically or electrically: they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the utility model provides a pair of install local mining axial-flow fan of resonance formula silencer additional, including perforation structure resonance formula silencer, collection wind ware, I level organism, I level impeller, II level organism, flame proof type three-phase asynchronous motor, noise elimination diffusion cone, collection wind ware and I level organism and II level organisms have constituted local mining axial-flow fan's shell in proper order, and the ventilation blower blade is fixed respectively and is constituted I level impeller and II level impeller on the impeller in proper order, I level impeller is located I level organism in, II level impeller be located II level organism in, the noise elimination diffusion cone be located II level impeller's rear portion, flame proof type three-phase asynchronous motor drives I level impeller and II level impeller rotation respectively, perforation structure resonance formula silencer install additional the outer wall of II level organism of II level impeller department.

As shown in fig. 2, the utility model provides a pair of install local mining axial-flow fan of resonance formula silencer additional, wherein the geometric parameters of perforation structure resonance formula silencer include resonance formula silencer length L =1m, aperture diameter D =10mm, aperture axial spacing D =30mm, circumference evenly distributed 12, total perforation number is 396, the percent opening is delta = 1%.

As shown in fig. 3, in order to accurately and comprehensively calculate the noise reduction effect of the local mining axial-flow fan with the resonance silencer, noise calculation is performed on four planes in the range of 0-1 m in the wake area of the two-stage impeller of the fan with the resonance silencer and without the resonance silencer. The design size of the silencer is 1m, so that noise calculation points are selected in the design range of the silencer, four sections are arranged for noise calculation, the distance between every two sections is 200mm, and the four sections from the air inlet to the air outlet are named as a section 1, a section 2, a section 3 and a section 4 in sequence. The distances from the section 1 to the air inlet of the ventilator are 2480mm respectively, the distances from the section 2 to the air inlet of the ventilator are 2680mm respectively, the distances from the section 3 to the air inlet of the ventilator are 2880mm respectively, and the distances from the section 4 to the air inlet of the ventilator are 3080mm respectively.

As shown in fig. 4, on the selected cross section, the rotation axis is taken as the center of a circle, 7 noise calculation points are respectively taken in the radial direction, the distances from the center of the circle to the noise calculation points are 270mm, 290mm, 310mm, 330mm, 350mm, 370mm and 390mm, and every two adjacent noise calculation points are 20mm apart.

And analyzing the data of each noise calculation point, and obtaining a noise spectrogram through FFT (fast Fourier transform). The noise spectrogram of the local mining axial-flow fan with the resonance type silencer and without the silencer is compared to find that the noise reduction effect in a high-frequency area is good, and the low-frequency noise reduction effect is weak. Under the condition of rated rotating speed, the local mining axial-flow fan with the resonance type silencer is mainly used for reducing noise aiming at high-frequency noise with the frequency of 2500Hz or above. The maximum sound pressure level of the local mining axial-flow fan with the resonance type silencer is 147.24 dB, the maximum sound pressure level of the local mining axial-flow fan without the silencer is 149.25dB, and noise is reduced by 2.01 dB. As shown in fig. 5, taking the section 1 as an example, by performing a comparative analysis on the maximum sound pressure level of each noise calculation point on the section 1 of the local mining axial-flow fan without and with the resonance type silencer, it can be obviously seen that the maximum sound pressure level of each noise calculation point of the local mining axial-flow fan with the resonance type silencer is reduced, and is reduced by 2.05% on average, thereby proving that the local mining axial-flow fan with the resonance type silencer has the noise reduction effect.

The utility model discloses an install resonance formula silencer additional to local mining axial-flow fan under the prerequisite of taking into account the ventilation blower performance, improve near fluidic turbulent state of ventilation blower casing, with the energy of resonant form noise elimination in the resonance intracavity, the noise abatement outwards propagates to reach the effect of the amortization of making an uproar of falling.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A local mining axial-flow fan with a resonance type silencer is characterized in that the resonance type silencer with a perforated structure is additionally arranged on the outer wall of a shell of a II-stage machine body of the local mining axial-flow fan;

the resonant silencer with the perforated structure is L =1m in length, D =10mm in diameter of the small hole, D =30mm in axial distance of the small hole, 12 holes are evenly distributed in the circumferential direction, the total number of perforations is 396, and the aperture ratio is delta = 1%;

the device also comprises an air collector, a class I machine body, a class I impeller, a class II machine body, an explosion-proof three-phase asynchronous motor and a silencing diffusion cone;

the wind collector with I level organism and II level organisms constitute local mining axial-flow fan's shell in proper order, I level impeller be located I level organism in, II level impeller be located II level organism in, the noise elimination diffusion awl be located II level impeller's rear portion, flame-proof type three-phase asynchronous motor drives I level impeller and II level impeller rotation respectively, the perforation structure resonance formula silencer install additional the outer wall of II level organisms of II level impeller department.