CN1587714A

CN1587714A - Low noise high pressure centrifugal fan

Info

Publication number: CN1587714A
Application number: CN 200410070957
Authority: CN
Inventors: 吴伟
Original assignee: 吴伟
Current assignee: Zhejiang Jiutong Machinery Technology Co., Ltd
Priority date: 2004-07-19
Filing date: 2004-07-19
Publication date: 2005-03-02
Anticipated expiration: 2024-07-19
Also published as: CN100340776C

Abstract

The invention relates to low noise high pressure centrifugal fan. It includes casing, air inlet coverplate, motor, impeller and frame. Wheel disc and shaft disc are connected, long blade and short blade are fixed between cover plate and wheel disc. There are reinforced ring and rib on external side. Air inlet two ends of air inlet cover plate are connected separately with air inlet flange and cover plate. Advantages: 1) reducing noise greatly, 2) product is strong, light and beautful. 3) small flow rate.

Description

Low noise high pressure centrifugal fan

Technical field:

The present invention relates to a kind of blower fan, a kind of low noise high pressure centrifugal fan belongs to centrifugal blower and makes the field.

Background technique:

At present, domestic centrifugal high pressure fan is being tied in the design, and the one, form the frontal arc blade by single-curved surface or many curved surfaces molded lines; The 2nd, cover by many curved surfaces molded lines combination wheel; The 3rd, different plane No. are geometric similarity convergent-divergent relation between same machine; The 4th, in full high voltage, follow big flow and high-power.The drawback of its existence: the one, the frontal arc blade structure itself determined that under the high-pressure work state, high frequency noise is big unusually, befouling environment seriously, harm people's psychosomatic health; The 2nd, complicated blade structure, wheel cap molded lines make processing charges huge, expand very difficulty of non-standard equipment; The 3rd, the similar Design theory falls sharply product pressure when small flow, and flow power increases severely during high total head, lacks the product of small flow, high total head.

Summary of the invention:

Purpose of design: avoid the deficiency in the background technique, the one, under high pressure, the small flow state, can avoid the generation of high frequency noise effectively, avoid environmental pollution; The 2nd, scientific design, simplified structure reduces processing charges, is convenient to the expansion of non-standard equipment; The 3rd, adopt the thin wall overpressure resistant structure, make product firmer, slimmer and more graceful, more have attractive in appearance.

Design proposal: in order to realize purpose of design of the present invention, the one, adopted afterwards to curved blade, its noise is reduced significantly, avoided the generation of high frequency noise effectively; The 2nd, casing is made the high-strength structure of carrying negative pressure, not only can reduce the weight of product widely, and has guaranteed the intensity of product and attractive in appearance.The present invention mainly is made up of impeller, casing, intake grill, frame, driving mechanism and motor.Impeller is made up of blade, shroud, hub disk and reel, can adopt Fine Steel Casting iron or corrosion-resistant stainless steel manufacturing according to the difference of usage requirement, and through the dynamic balance check of strictness, running steadily.Casing is made the high-strength structure of carrying negative pressure, and its material also can be by the different mining of usage requirement with Fine Steel Casting iron or corrosion-resistant stainless steel manufacturing.Blower fan can be made into dextrad rotation or two kinds of forms of left-handed rotation, and from motor or bearing housing one proper looking, impeller rotates in the direction of the clock, is called the dextrorotation blower fan; Be called left-handed blower fan by being rotated counterclockwise.The exit position of blower fan represents with the exit angle of casing, regulation range between 0～225 °, 45 ° at interval.

Technological scheme: low noise high pressure centrifugal fan, it comprises casing (1), air intake cover plate (2), motor (3), impeller (4), frame (5), wheel cap (6) in the impeller (4) and wheel disc (7) constitute suction port and air outlet and air-flow are played rule Shu Zuoyong, wheel disc (7) connects with reel (10), and linear leaf (8) and short blade (9) are positioned between wheel cap (6) and wheel disc (7) and with it and connect; The appearance of back side panel (14) and front side plate (15) is provided with stiffening ring (17) and stiffening rib (18) in the casing (1); Air intake pipe (20) two ends in the air intake cover plate (2) are connected with cover plate (21) with air intake flange (19) respectively.

The present invention compares with background technique, and the one, adopt the back to single circular arc curved vane, noise reduces greatly; The 2nd, the casing of thin wall overpressure resistant structure and air intake cover plate make product firm, slim and graceful, attractive in appearance; The 3rd, small flow, high total head, maximum total head are 15: 1 (Pa:m3/h) with the ratio of flow, compare with existing 4.4: 1 (Pa:m3/h), have satisfied the demand of numerous industries; The 4th, moulding is unique, light and handy, attractive in appearance, firm; The 5th, selection is extensive, both can select common iron for use, also can select stainless steel material for use.

Description of drawings:

Fig. 1 is the main TV structure schematic representation of low noise high pressure centrifugal fan.

Fig. 2 is the side-looking structural representation of Fig. 1.

Fig. 3 is the main TV structure schematic representation of impeller.

Fig. 4 is the side-looking structural representation of Fig. 3.

Fig. 5 is the main TV structure schematic representation of casing.

Fig. 6 is the side-looking structural representation of Fig. 5.

Fig. 7 is the inside partial structurtes schematic representation of Fig. 5.

Fig. 8 is the main TV structure schematic representation of housing side wall.

Fig. 9 is the side-looking structural representation of Fig. 7.

Embodiment:

Embodiment 1: low noise high pressure centrifugal fan, it comprises casing 1, air intake cover plate 2, motor 3, impeller 4, frame 5, motor 3 impeller 4 are done clockwise or rotation in casing 1 counterclockwise, air-flow is sucked, because rule bundle, the guide function of the suction of impeller 4 effect of getting rid of and casing 1 make air-flow flow out from exhaust outlet from the import of air intake cover plate 2, frame 5 is used for installing and fixing of parts, vibration damper 6 carrying complete machines contact with ground, and play the decay fan vibration, see according to attached Fig. 1 and 2.Wheel cap 6 in the impeller 4 constitutes suction port and air-flow is played rule Shu Zuoyong with wheel disc 7, wheel disc 7 connects with reel 10, linear leaf 8 and short blade 9 are positioned at wheel cap 6 and connect with 7 on wheel disc and with it, 6 air inlets of wheel cap and with 7 pairs of air-flows of wheel disc rise rule Shu Zuoyong, wheel disc 2 has connected whole supporting effect with reel 5, and with 6 pairs of air-flows of wheel cap rise rule Shu Zuoyong, linear leaf 8, short blade 9 connects wheel disc, wheel cap is the main part that produces flow and total head, linear leaf 8 and short blade 9 are spaced and the close exit angle of short blade, sense of rotation press behind the blade circular arc to, long, short blade plays aerodynamic effect; Wheel cap is plate or taper, suction port is made the circular arc tang, blade is a palintrope circular arc, blade air flow inlet angle is identical between the different plane No. of same machine, blade flow outlet angle is different between the different plane No. of same machine, its size is inverse relation with the plane No. size, and the blade radius of arc is identical between the different plane No. of same machine, sees accompanying

drawing

3 and 4; The appearance of back side panel 14 and front side plate 15 is provided with stiffening ring 17 and stiffening rib 18 in the casing 1; Air intake pipe 20 two ends in the air intake cover plate 2 are connected with cover plate 21 with air intake flange 19 respectively, see accompanying drawing 8 and 9.Outlet air flange 11 is withstand voltage standard flange, can guarantee tight with connecting of outer air duct, transition tube 12 circles are along connecting outlet air flange 1 and these parts main body, girth sheets 13, back side panel 14, front side plate 15 constitute these parts main body, back side panel 14, front side plate 15 appearances add stiffening ring 17 and stiffening rib 18, make casing both can bear big negative pressure, needn't adopt thick and heavy material again, the molded lines of girth sheets 13 is made by the equilateral based method of gradually opening in the casing 1, sees accompanying drawing 5～7.

Need to prove: though the foregoing description is to the present invention's detailed explanation of contrasting; but these explanations only limit to explanation of the present invention; rather than limitation of the present invention, any innovation and creation that do not exceed in the connotation of the present invention all fall within the scope of protection of the present invention.

Claims

1, a kind of low noise high pressure centrifugal fan, it comprises casing (1), air intake cover plate (2), motor (3), impeller (4), frame (5), it is characterized in that: the wheel cap (6) in the impeller (4) and wheel disc (7) constitute suction port and air outlet and air-flow are played rule Shu Zuoyong, wheel disc (7) connects with reel (10), and linear leaf (8) and short blade (9) are positioned between wheel cap (6) and wheel disc (7) and with it and connect.

2, low noise high pressure centrifugal fan according to claim 1 is characterized in that: wheel cap (6) is plate, and suction port is the circular arc tang, and blade is palintrope circular arc.

3, low noise high pressure centrifugal fan according to claim 2, it is characterized in that: the air flow inlet angle is being that identical, exit angle is different between the different plane No. of same machine between the different plane No. of same machine, its size is inverse relation with the plane No. size, and the blade radius of arc is identical between the different plane No. of same machine.

4, low noise high pressure centrifugal fan according to claim 1 is characterized in that: linear leaf (8) and short blade (9) are spaced and the close exit angle of short blade.

5, low noise high pressure centrifugal fan according to claim 1 and 2 is characterized in that: the sense of rotation of impeller (4) press behind the blade circular arc to.

6, low noise high pressure centrifugal fan according to claim 1 is characterized in that: the molded lines of girth sheets (13) is made by the equilateral based method of gradually opening in the casing (1).

7, low noise high pressure centrifugal fan according to claim 1 is characterized in that: the appearance of back side panel (14) and front side plate (15) is provided with stiffening ring (17) and stiffening rib (18) in the casing (1).

8, low noise high pressure centrifugal fan according to claim 1 is characterized in that: air intake pipe (20) two ends in the air intake cover plate (2) are connected with cover plate (21) with air intake flange (19) respectively.

9, low noise high pressure centrifugal fan according to claim 1 is characterized in that: the appearance of back side panel (14) and front side plate (15) is provided with stiffening ring (17) and stiffening rib (18) in the casing (1).

10, low noise high pressure centrifugal fan according to claim 1 is characterized in that: wheel cap (6) is dull and stereotyped or tapered.