CN103195751A

CN103195751A - Backward-inclining type centrifugal fan blade

Info

Publication number: CN103195751A
Application number: CN2013101140866A
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: 2013-04-03
Filing date: 2013-04-03
Publication date: 2013-07-10
Anticipated expiration: 2033-04-03
Also published as: CN103195751B

Abstract

The invention relates to the field of ventilating devices and discloses a backward-inclining type centrifugal fan blade which comprises a round baseboard, nine blades and a flow guiding ring. The air inlet angles of the blades are not more than 10 degrees, and the air outlet angles of the blades range between 25 degrees to 35 degrees; the upper portions of the blades are formed by connection areas and non-connection areas which are integrated, and the connection areas of the blades and the flow guiding ring are fixed together through ultrasonic welding, and the length of the connection areas occupies 25-35% of the top length of the blades; the area of an air inlet between any two adjacent blades is 62%-65% of that of a corresponding air outlet; and the width of the flow guiding ring is 45%-55% of the height of the flow guiding ring, and the height of the flow guiding ring is 60%-70% of that of the air outlets of the blades. The backward-inclining type centrifugal fan blade has the advantages of being novel in structure, large in air quantity and low in noise.

Description

The BI centrifugation blade

Technical field

The present invention relates to the ventilation equipment field, relate 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 circular leaf base plate, blade and baffle liner, vanes fixed is between circular leaf base plate and baffle liner, and the axis hole that motor shaft passes on the circular leaf base plate during use drives the fan blade rotation.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, 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

The objective of the invention is to disclose a kind of novel structure in order to enrich the kind of centrifugation blade, the BI centrifugation blade that air quantity is big and noise is low.

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

The BI centrifugation blade comprises circular leaf base plate, blade and baffle liner, and vanes fixed arranges the material-saving die cavity in the blade between circular leaf base plate and baffle liner, and described blade is 9, and blade is regularly arranged along the circumference end face of circular leaf base plate; The air intake angle angle of all blades is identical, and the air intake angle of blade is not more than 10 °, and the air-out angle angle of all blades is identical, and the air-out angle angle of blade is between 25 °-35 °; The inner of blade and outer end form circle and blade cylindrical in the blade respectively, and diameter of a circle is the diameter 40%-45% of blade cylindrical in the blade; Blade top is made of the connection area that is connected as a single entity and disconnected district, connection area and the baffle liner of blade are fixed by ultrasonic welding, disconnected district is in the air intake direction of blade inboard, the connection area is in the outside in disconnected district, the tie point in connection area and disconnected district is that the highest point of blade is the summit, and connection area length accounts for the 25%-35% of vane tip length; Air-admitting surface between the adjacent blades is the 62%-65% of the exhaust outlet area of correspondence arbitrarily; The width of baffle liner is the 45%-55% of baffle liner height, and the height of baffle liner is the 60%-70% of blade exhaust outlet height.

As preferably, the outer ledge of baffle liner is provided with the flange that is connected as a single entity with it, and the height of flange is the 18%-23% of baffle liner height, has improved the intensity of baffle liner.

As preferably, the air intake angle of blade is air intake surface with the opposite tangent direction of fan blade sense of rotation and the angle of blade air intake surface circular arc tangential line, and the air-out angle is outlet air surface with the opposite tangent direction of fan blade sense of rotation and the angle of blade outlet air surface circular arc tangential line; Guide face on the baffle liner is curved, and its radius of the radian value is between 100-110mm.Adopt the baffle liner of said structure can reduce noise.

As preferably, circular diameter is 120.5mm in the blade, and the blade outside diameter is 283.7mm; The height of baffle liner is 57.2mm, and width is 28.6mm; The height of blade exhaust outlet is 87.8mm; The height of flange is 12.5mm; Connection area length is 43.1mm, and vane tip length is 144.6mm.Further, the air intake angle of blade is 5.6 °, and the air-out angle angle of all blades is 30 °.Adopt the BI centrifugation blade utilization efficiency of above-mentioned parameter best, air quantity maximum and noise are minimum.

Adopted the BI centrifugation blade of above-mentioned technological scheme, blade is 9, the air-out angle angle of blade is identical and be not more than 10 °, the air-out angle angle of blade is identical and between 25 °-35 °, the inner of blade and outer end form circle and blade cylindrical in the blade respectively, diameter of a circle is the diameter 40%-45% of blade cylindrical in the blade, the efficient height of turnover wind.Disconnected district is in the air intake direction of blade inboard, increases incoming air area, and air quantity increases.The tie point in connection area and disconnected district is that the highest point of blade is the summit, and connection area length accounts for the 25%-35% of vane tip length, can guarantee the join strength of blade and baffle liner, can promote the air quantity more than 3% again.Air-admitting surface between the adjacent blades is the 62%-65% of the exhaust outlet area of correspondence arbitrarily, obtains good static pressure, and air intake efficiency improves 3% at least.The width of baffle liner is the 45%-55% of baffle liner height, and the height of baffle liner is the 60%-70% of blade exhaust outlet height, and noise reduction is well controlled.The advantage of this BI centrifugation blade is novel structure, and air quantity is big and noise is low.

Description of drawings

Fig. 1: the structural representation of embodiments of the invention.

Fig. 2: the schematic representation of BI centrifugation blade bottom in the embodiment of the invention.

Fig. 3: the structural representation of circular leaf base plate and blade in the embodiment of the invention.

Fig. 4: the local enlarged diagram of baffle liner in the embodiment of the invention.

Embodiment

Make a detailed explanation below in conjunction with the specific embodiment of the present invention of Fig. 1, Fig. 2, Fig. 3 and Fig. 4.

BI centrifugation blade as shown in Figure 1, Figure 2, Figure 3 and Figure 4, comprise circular leaf base plate 1, blade 3 and baffle liner 4, blade 3 is fixed between circular leaf base plate 1 and the baffle liner 4, material-saving die cavity 31 is set in the blade 3, blade 3 is 9, and blade 3 is regularly arranged along the circumference end face of circular leaf base plate 1.The middle part of circular leaf base plate 1 arranges axis hole 2, and the axis hole 2 that motor shaft passes on the circular leaf base plate 1 during use drives the fan blade rotation.

The air intake angle a angle of all blades 3 is identical, the air intake angle a of blade is not more than 10 °, the air-out angle b angle of all blades 3 is identical, the air-out angle b angle of blade is between 25 °-35 °, the air intake angle a of blade is air intake surface with the opposite tangent direction of fan blade sense of rotation and the angle of blade air intake surface circular arc tangential line, and air-out angle b is outlet air surface with the opposite tangent direction of fan blade sense of rotation and the angle of blade outlet air surface circular arc tangential line.

The inner of blade 3 and outer end form circle and blade cylindrical in the blade respectively, and diameter of a circle is the diameter 40%-45% of blade cylindrical in the blade.Blade 3 tops are made of the connection area 32 that is connected as a single entity and disconnected district 33, the connection area 32 of blade 3 and baffle liner 4 are fixed by ultrasonic welding, disconnected district 33 is in the air intake direction of blade 3 inboards, connection area 32 is in the outside in disconnected district 33, the tie point in connection area 32 and disconnected district 33 is that the highest point of blade 3 is the summit, connection area 32 length account for the 25%-35% of blade 3 top length, can guarantee the intensity that is connected of blade 3 and baffle liner 4, can promote the air quantity about 2% again.Intake grill 51 areas between the adjacent blades 3 are 62%-65% of exhaust outlet 52 areas of correspondence arbitrarily, can obtain best static pressure, and air intake efficiency improves 5% at least.The width 4L of baffle liner 4 is 45%-55% of baffle liner 4 height 4H, and the height 4H of baffle liner is the 60%-70% of blade exhaust outlet 52 height, and the guide face on the baffle liner 4 is curved, and its radius of the radian value is between 100-110mm.The outer ledge of baffle liner 4 is provided with the flange 41 that is connected as a single entity with it, and the height 41H of flange 41 is 18%-23% of baffle liner height 4H, better controlled noise.

The parameter of above-mentioned BI centrifugation blade the best is as follows, and the air intake angle a of blade is 5.6 °, and the air-out angle b angle of blade is 30 °.Circular diameter is 120.5mm in the blade, and the blade outside diameter is 283.7mm.The height 4H of baffle liner is 57.2mm, and the width 4L of baffle liner is 28.6mm.The height of blade exhaust outlet 52 is 87.8mm.The height of flange 41 is 12.5mm, and connection area 32 length are 43.1mm, and blade 3 top length are 144.6mm.Adopt the BI centrifugation blade utilization efficiency of above-mentioned parameter best, air quantity maximum and noise are minimum.

Adopt the BI centrifugation blade of said structure and parameter, under the prerequisite that air quantity increases, effectively reduced noise, in the market its air quantity of the similar centrifugation blade of Dimensions generally be 2000 cubic metres per hour, noise generally is 45 decibels, its air quantity of centrifugation blade that adopts above-mentioned parameter be 2100 cubic metres per hour, noise is 41 decibels, and namely air quantity is big and noise is low.

Claims

1. the BI centrifugation blade comprises circular leaf base plate, blade and baffle liner, and vanes fixed arranges the material-saving die cavity in the blade between circular leaf base plate and baffle liner, it is characterized in that described blade is 9, and blade is regularly arranged along the circumference end face of circular leaf base plate; The air intake angle angle of all blades is identical, and the air intake angle of blade is not more than 10 °, and the air-out angle angle of all blades is identical, and the air-out angle angle of blade is between 25 °-35 °; The inner of blade and outer end form circle and blade cylindrical in the blade respectively, and diameter of a circle is the diameter 40%-45% of blade cylindrical in the blade; Blade top is made of the connection area that is connected as a single entity and disconnected district, connection area and the baffle liner of blade are fixed by ultrasonic welding, disconnected district is in the air intake direction of blade inboard, the connection area is in the outside in disconnected district, the tie point in connection area and disconnected district is that the highest point of blade is the summit, and connection area length accounts for the 25%-35% of vane tip length; Air-admitting surface between the adjacent blades is the 62%-65% of the exhaust outlet area of correspondence arbitrarily; The width of baffle liner is the 45%-55% of baffle liner height, and the height of baffle liner is the 60%-70% of blade exhaust outlet height.

2. BI centrifugation blade according to claim 1 is characterized in that the outer ledge of baffle liner is provided with the flange that is connected as a single entity with it, and the height of flange is the 18%-23% of baffle liner height.

3. BI centrifugation blade according to claim 1, the air intake angle that it is characterized in that blade is air intake surface with the opposite tangent direction of fan blade sense of rotation and the angle of blade air intake surface circular arc tangential line, and the air-out angle is outlet air surface with the opposite tangent direction of fan blade sense of rotation and the angle of blade outlet air surface circular arc tangential line; Guide face on the baffle liner is curved, and its radius of the radian value is between 100-110mm.

4. BI centrifugation blade according to claim 2 is characterized in that circular diameter is 120.5mm in the blade, and the blade outside diameter is 283.7mm; The height of baffle liner is 57.2mm, and width is 28.6mm; The height of blade exhaust outlet is 87.8mm; The height of flange is 12.5mm; Connection area length is 43.1mm, and vane tip length is 144.6mm.

5. BI centrifugation blade according to claim 1, the air intake angle that it is characterized in that described blade is 5.6 °, the air-out angle angle of all blades is 30 °.