CN2416263Y

CN2416263Y - Low-noise axial fan

Info

Publication number: CN2416263Y
Application number: CN 00204950
Authority: CN
Inventors: 陈海生; 梁锡智; 谭春青; 康顺
Original assignee: Institute of Engineering Thermophysics of CAS
Current assignee: Institute of Engineering Thermophysics of CAS
Priority date: 2000-03-06
Filing date: 2000-03-06
Publication date: 2001-01-24
Anticipated expiration: 2010-03-06

Abstract

The utility model relates to a low-noise axial fan. The utility model has a structure that a driving motor is fixedly connected with an impeller through a linking shaft; air flow dividers comprising flow dividing sheets which are uniformly distributed along the circumferential direction are arranged in the front of the impeller and the inner side of the outward projected part of a housing; both ends of each of the flow dividing sheets are respectively fixedly connected with inner rings and the inner wall of the housing; the flow dividing sheets are elliptical or streamline-shaped rings in which noise absorbing elements are filled; a passage of each of the air flow dividers comprises a blade tip exposed zone, the front end of the flow divider, and the back end of the flow divider. Through the flow dividers, air flows blocked in the blade tip zone is made to orderly return to a main flow again through the flow dividing passage, and vortex flow noises are absorbed by the noise absorbing elements, so that the low-noise axial fan with a high pressure head is obtained.

Description

Low noise axial fan

The utility model relates to a kind of low noise axial fan, is applicable to the axial-flow blower of making ventilation and air-cooled occasion.Carry out also can be used for after the explosion-proof and preservative treatment ventilation in operation places such as colliery and chemical industry.

Existing axial-flow blower is when load increases, the air-flow at fan blade top takes place to separate and progressively strengthens and blocks, often cause the stall and the surge of blower fan, thereby dwindled the operating range of blower fan, improved fan noise owing to airflow breakaway simultaneously, and may cause the destruction of blower fan owing to surge causes the resonance of unit.

The purpose of this utility model is to provide a kind of low noise axial fan, to solve the generation of existing axial-flow blower stall and surge.

Realize that the technical measures that the utility model purpose taked are as follows: in draught fan impeller the place ahead, the inboard of casing evagination part is provided with air diverter, it by section ovalize or streamline, be connected with interior ring, along circumferential uniform metal porous perforated plate, in the annular perforations plate sound absorbing element of cladding and in ring constitute.

The utility model has the advantages that: make the air communication that is blocked in the blade tip district cross Methodistic again the turning back in the air-flow main flow of passage of air diverter, thereby avoided the stall of blower fan and the generation of surge; The noise that will flow through the splitter airflow on surface simultaneously absorbs, thereby reaches the purpose that reduces noise, and through measuring, fan noise has reduced by 10 decibels at least.

Fig. 1 be the utility model structure partly cut open schematic representation, Fig. 2 is the B-B sectional view of Fig. 1, Fig. 3 is the A-A section amplification figure of Fig. 1.

In conjunction with the accompanying drawings structure of the present utility model and embodiment are described as follows: the utility model is made up of impeller 5, casing 2, drive motor D, air diverter 3 and support (not shown) etc.Air diverter 3 is by the circumferential uniform splitter 11 in 17～24 edges, and with the interior ring 4 that splitter one end is connected, the casing that the ring-type evagination is arranged 2 that is connected with the splitter the other end constitutes.Splitter is φ 4～φ 6 by the aperture, punching rate is that 25% perforated metal panel 8 is arranged to vesica piscis or streamline ring, the ring inwall is provided with cladding glass cloth 10, be filled with sound absorption super glass wool 9 in it, drive motor D is fixed on the casing lower end by support, it is connected through couple axle 6 and impeller shaft, and the front end of casing 2 is provided with adpting flange 1, and it is connected with the flange of ventilation duct.The inner space of casing evagination part is divided into blade tip exposed zone (I), split channel front end (II), split channel rear end (III) three parts.

Working principle of the present utility model is: drive motor D drives axial fan hubs 7 by couple axle 6 and is installed in blade 5 rotations on the wheel hub, makes from the air-flow supercharging of main flow direction a and along main flow direction b to be sent.When the blower fan load increased, airflow obstruction took place in blade 5 tops, makes blade generation stall or surge.After loading onto the air diverter that has the noise elimination splitter, when the working state of blower fan approaches the airflow breakaway state, the air-flow that blocks in blower fan Ye Ding district is inhaled in the blade tip exposed zone I of blade 5, guide functions by air diverter again, eliminate the rotation of blocking eddy current, return among the air inlet main flow a by split channel rear end III then, so just avoided the stall of blower fan, expanded the operating range of blower fan.The length of exposure of fan blade blade tip is 50%～80% with the ratio of the axial chord length of blade tip.Simultaneously, when the splitter of eliminating the noise through band, noise is absorbed by the sound absorbent of splitter it is descended significantly, and blower fan is the high-head blower fan of low noise.

Claims

1. a low noise axial fan is characterized in that, it be constructed as follows: air diverter (3) is by along circumferential uniform splitter (11), and with the interior ring (4) that splitter one end is connected, the casing that the ring-type evagination is arranged that is connected with the splitter the other end constitutes; Splitter is perforated metal panel (8), is arranged to vesica piscis, and the ring inwall is provided with cladding glass cloth (10), is filled with sound absorption super glass wool (9) in it; Drive motor D is fixed on the casing lower end by support, it is connected through couple axle (6) and impeller, the front end of casing (2) is provided with adpting flange (1), it is connected with the flange of ventilation duct, the inner space of casing evagination part is divided into blade tip exposed zone (I), split channel front end (II), split channel rear end (III) three parts.

2. by the described axial-flow blower of claim 1, it is characterized in that the quantity of splitter is 17～24; The aperture of perforated plate is φ 4～φ 6, and punching rate is 25%, and perforated plate can be arranged to the streamline ring.