CN203214419U

CN203214419U - Backward-inclined centrifugal fan blade

Info

Publication number: CN203214419U
Application number: CN 201320161249
Authority: CN
Inventors: 高文铭; 韩小红; 施建立
Original assignee: Ningbo Langdi Impeller Machinery Co Ltd
Current assignee: Ningbo Langdi Impeller Machinery Co Ltd
Priority date: 2013-04-02
Filing date: 2013-04-02
Publication date: 2013-09-25
Anticipated expiration: 2023-04-02

Abstract

The utility model relates to the field of ventilating devices. A backward-inclined centrifugal fan blade comprises a circular-ring-shaped blade base plate, a hub, a blade body and a flow guiding ring, wherein the blade body is fixed between the circular-ring-shaped blade base plate and the flow guiding ring, the hub is connected with the inner side of the circular-ring-shaped blade base plate integrally, a shaft hole sleeve is arranged at the center position of the hub, and a plurality of heat radiating holes are arranged on the hub. The portion from the air inlet end and the air outlet end of the blade body is distorted, an air inlet angle of the blade body is divided into an upper air inlet angle close to the flow guiding ring and a lower air inlet angle close to the circular-ring-shaped blade base plate, the upper air inlet angle is 15-25 degrees, and the lower air inlet angle is smaller than 5 degrees. The air outlet angle of the blade body is divided into an upper air outlet angle close to the flow guiding ring and a lower air outlet angle close to the circular-ring-shaped blade base plate, and the upper air outlet angle and the lower air outlet angle are in a range of 20-40 degrees. The backward-inclined centrifugal fan blade has the advantages of being novel in structure and low in noise.

Description

A kind of BI centrifugation blade

Technical field

The utility model relates to the ventilation equipment field, relates in particular to a kind of centrifugation blade.

Background technique

The BI centrifugation blade is product commonly used in the ventilation equipment field, the BI centrifugation blade comprises ring leaf base plate, wheel hub, blade and baffle liner, vanes fixed is between ring leaf base plate and baffle liner, wheel hub and ring leaf base plate inboard are connected as a single entity, wheel hub is concentric with ring leaf base plate, the center at wheel hub top arranges axle sleeve, and motor shaft passes the axle sleeve upper shaft hole and drives the fan blade rotation during use.The usability of BI centrifugation blade is mainly reflected in air quantity size and noise control aspect, air quantity size and noise just are mutual, the general big noise of air quantity is relatively just high, the little noise of air quantity is low naturally, the parameter that the usability of BI centrifugation blade relates to is a lot, for example the shape of leaf base plate, wheel hub, blade and baffle liner, size and Placement etc.Very reasonably the BI centrifugation blade is few in air quantity size and noise control in the market.

Summary of the invention

Goal of the invention of the present utility model is in order to enrich the kind of centrifugation blade, to disclose a kind of novel structure, the BI centrifugation blade that noise is low.

In order to realize above-mentioned purpose, the utility model has adopted following technological scheme:

A kind of BI centrifugation blade, comprise ring leaf base plate, wheel hub, blade and baffle liner, vanes fixed is between ring leaf base plate and baffle liner, and wheel hub and ring leaf base plate inboard are connected as a single entity, the center shaft hole sleeve of wheel hub, wheel hub is provided with a plurality of radiation holes; Blade air intake to outlet air end is distorted shape, the air intake angle of blade is divided into the following air intake angle near the last air intake angle of baffle liner and close ring leaf base plate, last air intake angle angle is between 15 °-25 °, following air intake angle angle is less than 5 °, the air-out angle of blade is divided into the following air-out angle near the last air-out angle of baffle liner and close ring leaf base plate, and last air-out angle and following air-out angle are all between 20 °-40 °.

As preferably, last air-out angle angle is less than following air-out angle angle, and the difference between last air-out angle angle and the following air-out angle angle is between 5 °-15 °, further, the last air intake angle of blade is 21.8 °, and following air intake angle is 0.8 °, last air-out angle is 24.8 °, following air-out angle is 34 °, and utilization efficiency is best, and noise is minimum.

Adopted a kind of BI centrifugation blade of above-mentioned technological scheme, last air intake angle angle is between 15 °-25 °, following air intake angle angle is less than 5 °, all between 20 °-40 °, the last air intake angle of blade is different with following air intake angle angle for last air-out angle and following air-out angle, and last air-out angle is different with following air-out angle angle, make the air-out of blade be linear change along the blade height direction, effectively weaken the noise energy stack, can effectively weaken the noise energy stack, reduce noise.The advantage of this BI centrifugation blade is novel structure, and noise is low.

Description of drawings

Fig. 1: the utility model embodiment's structural representation.

Fig. 2: the BI centrifugation blade structural representation one that baffle liner is not installed among the utility model embodiment.

Fig. 3: the BI centrifugation blade structural representation two that baffle liner is not installed among the utility model embodiment.

Embodiment

Below in conjunction with Fig. 1, Fig. 2 and Fig. 3 embodiment of the present utility model is made a detailed explanation.

As Fig. 1, Fig. 2 and a kind of BI centrifugation blade shown in Figure 3, comprise ring leaf base plate 1, wheel hub 2, blade 3 and baffle liner 4, blade 3 is fixed between ring leaf base plate 1 and the baffle liner 4, wheel hub 2 is connected as a single entity with ring leaf base plate 1 inboard, wheel hub 2 is concentric with ring leaf base plate 1, the material-saving die cavity is set in the blade 3, the center at wheel hub 2 tops is provided with the shaft hole sleeve 5 that is connected as a single entity with it, be useful on the axis hole that connects motor shaft on the shaft hole sleeve 5, wheel hub 2 is provided with a plurality of radiation holes 21, the arrangement of a plurality of radiation holes 21 equidistant rule centered by shaft hole sleeve 5.

Blade 3 air intakes to outlet air end is distorted shape, the air intake angle of blade 3 is divided into the following air intake angle a2 near the last air intake angle a1 of baffle liner 4 and close ring leaf base plate 1, last air intake angle a1 angle is between 15 °-25 °, following air intake angle a2 angle is less than 5 °, the air-out angle of blade 3 is divided into the following air-out angle b2 near the last air-out angle b1 of baffle liner 4 and close ring leaf base plate 1, last air-out angle b1 and following air-out angle b2 are all between 20 °-40 °, last air-out angle b1 angle is less than following air-out angle angle b2, and the difference between last air-out angle b1 angle and the following air-out angle b2 angle is between 5 °-15 °.Last air intake angle a1 is different with following air intake angle a2 angle, and last air-out angle b1 is different with following air-out angle b2 angle, makes the air-out of blade 3 be linear change along the blade height direction, can effectively weaken the noise energy stack, reduces noise 2dB at least.Last air intake angle a1 is the air intake surface top end with the opposite tangent direction of fan blade sense of rotation and the angle of blade air intake surface top circular arc tangential line, following air intake angle a2 is air intake surface bottom place with the opposite tangent direction of fan blade sense of rotation and the angle of blade air intake surface bottom circular arc tangential line, last air-out angle b1 is the outlet air surface top end with the opposite tangent direction of fan blade sense of rotation and the angle of blade outlet air surface top circular arc tangential line, and following air-out angle b2 is place, outlet air surface bottom with the opposite tangent direction of fan blade sense of rotation and the angle of blade outlet air surface bottom circular arc tangential line.

The last air intake angle a1 of blade 3 is 21.8 °, and following air intake angle a2 is 0.8 °, and last air-out angle b1 is 24.8 °, and following air-out angle b2 is 34 °.The similar BI centrifugation blade of Dimensions noise generally is 49 decibels in the market, and the BI centrifugation blade noise of this patent is not higher than 45 decibels.

Claims

1. BI centrifugation blade, comprise ring leaf base plate, wheel hub, blade and baffle liner, vanes fixed is between ring leaf base plate and baffle liner, and wheel hub and ring leaf base plate inboard are connected as a single entity, the center of wheel hub is provided with shaft hole sleeve, and wheel hub is provided with a plurality of radiation holes; It is characterized in that blade air intake to outlet air end is distorted shape, the air intake angle of blade is divided into the following air intake angle near the last air intake angle of baffle liner and close ring leaf base plate, last air intake angle angle is between 15 °-25 °, following air intake angle angle is less than 5 °, the air-out angle of blade is divided into the following air-out angle near the last air-out angle of baffle liner and close ring leaf base plate, and last air-out angle and following air-out angle are all between 20 °-40 °.

2. a kind of BI centrifugation blade according to claim 1 it is characterized in that air-out angle angle less than following air-out angle angle, and the difference between last air-out angle angle and the following air-out angle angle is between 5 °-15 °.

3. a kind of BI centrifugation blade according to claim 1 and 2 is characterized in that the last air intake angle of blade is 21.8 °, and following air intake angle is 0.8 °, and last air-out angle is 24.8 °, and following air-out angle is 34 °.