CN201582175U

CN201582175U - Anti-backflow structure of centrifugal fan

Info

Publication number: CN201582175U
Application number: CN2009202554853U
Authority: CN
Inventors: 彭朝华
Original assignee: YIXING CHENJI GLASS STEEL FAN MACHINE CO Ltd
Current assignee: YIXING CHENJI GLASS STEEL FAN MACHINE CO Ltd
Priority date: 2009-11-19
Filing date: 2009-11-19
Publication date: 2010-09-15
Anticipated expiration: 2019-11-19

Abstract

The utility model relates to an anti-backflow structure of a centrifugal fan, which comprises an impeller and a casing. Blades of the impeller are in a spiral structure. The anti-backflow structure of a centrifugal fan is characterized in that spiral raised ribs are arranged on the outer surface of an impeller disc, and revolving direction of the spiral raised ribs is the same with that of the blades. With the spiral raised ribs arranged on the outer surface of the impeller disc, when an air outlet of the fan is blocked, negative pressure is formed between the impeller disc and the casing due to centrifugal function of the spiral raised ribs, and air flow can not flow back from a gap between the casing and a fan shaft.

Description

The anti-structure of pouring in down a chimney of centrifugal blower

(1) technical field

The utility model relates to the centrifugal blower parts, is specially the anti-structure of pouring in down a chimney of centrifugal blower.

(2) background technique

Traditional centrifugal blower, its typical assembly structure be as shown in Figure 1: the impeller 1 with blade 2 and intake grill 3 is assemblied on the blower fan axle 6, and blower fan axle 6 passes casing 5, between the wheel disc 4 and casing 5 of impeller 1, all have the fit up gap between blower fan axle 6 and the casing 5.The problem that this structure exists is: when the exhaust outlet of blower fan stops up, the fog of discharging can pour in down a chimney, flow out from the gap between casing 5 and the blower fan axle 6, cause the blower fan ambient air to be polluted, air quality descends, if blower fan is used for indoor meeting and causes indoor air severe contamination, even causes staff's poisoning.

(3) summary of the invention

At the problems referred to above, the utility model provides a kind of anti-structure of pouring in down a chimney of centrifugal blower, and this structure can stop pouring in down a chimney of air-flow effectively, keeps blower fan ambient air quality.

Its technological scheme is such: it comprises impeller, casing, and the blade of described impeller is a helix structure, it is characterized in that: the outer surface of described hub disk is provided with spiral convex rib, and the rotation direction of described spiral convex rib is identical with the rotation direction of described blade.

It is further characterized in that: described spiral convex rib is uniform on described wheel disc; The center of described hub disk is provided with axially overhanging center tube, be positioned at described center tube periphery, described wheel disc is provided with water holding ring, is provided with the dash cover between described center tube and the described water holding ring, and described dash cover is provided with flange near the end of described wheel disc; Described center tube and described water holding ring are one-body molded on the wheel disc of described impeller; The material of described center tube, described water holding ring and described impeller is a glass fibre reinforced plastics; Described dash cover is installed on described casing, and described center tube passes described dash cover, and the exterior edge face of described dash cover is in the end face inboard of described water holding ring.

The outer surface of the utility model hub disk is provided with spiral convex rib, and when the exhaust outlet of blower fan stopped up, because the centrifugal action of spiral convex rib forms negative pressure between hub disk and the casing, air-flow can not pour in down a chimney from the gap between casing and the blower fan axle; The utility model hub disk is provided with center tube and water holding ring; between center tube and water holding ring, be provided with the dash cover that has flange; the drop that condenses in the blower fan is guided in the annular groove that flows between dash cover and the casing by water holding ring; and further flow to the bottom of blower fan; center tube stops the small amount of drop of crossing water holding ring; avoid drop to flow on the blower fan axle, the utility model structure can stop the water that coagulates in the blower fan to outflow effectively, and the component of protection blower fan are avoided corrosion.

(4) description of drawings

Fig. 1 is the structural representation of traditional centrifugal blower;

Fig. 2 is first a kind of embodiment's of the present utility model structural representation;

Fig. 3 is the left view of Fig. 2;

Fig. 4 is second a kind of embodiment's of the present utility model structural representation;

Fig. 5 is the left view of Fig. 4;

Fig. 6 is the sectional view of the water holding ring in the utility model;

Fig. 7 is the left view of Fig. 6.

(5) embodiment

The utility model is the anti-structure of pouring in down a chimney on a kind of impeller that is arranged at centrifugal blower.As Fig. 2, shown in Figure 3, it comprises impeller 1, and the blade 2 of impeller 1 is a helix structure, and impeller 1 comprises intake grill 3.The outer surface of the utility model hub disk 4 is provided with many spiral convex ribs 10, and the rotation direction of spiral convex rib 10 is identical with the rotation direction of blade 2.The effect that spiral convex rib 10 is set is that when the exhaust outlet of blower fan stopped up, because the centrifugal action of spiral convex rib 10 forms negative pressure between hub disk 4 and the casing 5, air-flow can not pour in down a chimney from the gap between casing 5 and the blower fan axle 6.

Spiral convex rib 10 is uniform on wheel disc 4.As Fig. 4, shown in Figure 5, in order to stop the water that coagulates in the blower fan to outflow, the utility model can also be provided with axially overhanging center tube 7 at the center of hub disk 4, the wheel disc 4 that is positioned at center tube 7 radial outsides is provided with water holding ring 9, be provided with dash cover 8 between center tube 7 and the water holding ring 9, dash cover 8 is provided with flange 11 (referring to Fig. 6, Fig. 7) near the end of wheel disc 4, dash cover 8 is fixed on the casing 5 when installing, center tube 7 passes dash cover 8, and the exterior edge face of dash cover 8 is in the end face inboard of water holding ring 9.The material of center tube 7, water holding ring 9 and impeller 1 can adopt glass fibre reinforced plastics; Center tube 7 is one-body molded on the wheel disc 4 of impeller 1 with water holding ring 9.

In blower fan when work,, the drop that condenses in the blower fan, by water holding ring 9 guiding, flows in the annular groove between dash cover 8 and the casing 5, and further flows to the bottom of blower fan during to center flow along wheel disc 4; Even there is small amount of drop to cross water holding ring 9,, can stops the water that coagulates in the blower fan to outflow effectively, thereby protect the component of blower fan to avoid corrosion because the existence of center tube 7 can not flow on the blower fan axle 6 yet.

Claims

1. the anti-structure of pouring in down a chimney of centrifugal blower, it comprises impeller, casing, and the blade of described impeller is a helix structure, it is characterized in that: the outer surface of described hub disk is provided with spiral convex rib, and the rotation direction of described spiral convex rib is identical with the rotation direction of described blade.

2. the anti-structure of pouring in down a chimney of centrifugal blower according to claim 1, it is characterized in that: described spiral convex rib is uniform on described wheel disc.

3. the anti-structure of pouring in down a chimney of centrifugal blower according to claim 2, it is characterized in that: the center of described hub disk is provided with axially overhanging center tube, be positioned at described center tube periphery, described wheel disc is provided with water holding ring, be provided with the dash cover between described center tube and the described water holding ring, described dash cover is provided with flange near the end of described wheel disc.

4. the anti-structure of pouring in down a chimney of centrifugal blower according to claim 3, it is characterized in that: described center tube and described water holding ring are one-body molded on the wheel disc of described impeller.

5. the anti-structure of pouring in down a chimney of centrifugal blower according to claim 4, it is characterized in that: the material of described center tube, described water holding ring and described impeller is a glass fibre reinforced plastics.

6. the anti-structure of pouring in down a chimney of centrifugal blower according to claim 5, it is characterized in that: described dash cover is installed on described casing, and described center tube passes described dash cover, and the exterior edge face of described dash cover is in the end face inboard of described water holding ring.