CN211314585U

CN211314585U - Prevent inside air backflow's centrifugal fan

Info

Publication number: CN211314585U
Application number: CN201922269597.0U
Authority: CN
Inventors: 吴金生; 杨存名; 杨博坤
Original assignee: Dongguan Excel Industrial Co ltd
Current assignee: Dongguan Excel Industrial Co ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-08-21
Anticipated expiration: 2029-12-17

Abstract

The utility model relates to a centrifugal fan for preventing the internal air from flowing back; the centrifugal wind wheel is rotatably arranged in the wind cavity, the wind channel shell comprises an integrally formed bottom plate and a side wall arranged on the bottom plate, the bottom plate is provided with an outward convex step-type boss, the boss and the bottom plate mutually form an internal clamping groove communicated with the wind cavity, and the centrifugal wind wheel is embedded in the clamping groove; the beneficial effects of the utility model embody: the utility model aims at providing a prevent centrifugal fan of inside air backward flow sets up the backward flow structure of step through the bottom at the fan, sets up centrifugal wind wheel wholly in the inside draw-in groove of wind channel shell to cut off the route of gas reflux, prevent that the air current from getting back to centrifugal wind wheel's vent department again and carry out invalid circulation, thereby avoid the output volume reduction of the fan that leads to of backward flow, improved whole work efficiency.

Description

Prevent inside air backflow's centrifugal fan

Technical Field

The utility model relates to a centrifugal fan's technical field refers in particular to one kind through the step structure avoid the backward flow thereby raise the efficiency prevent centrifugal fan of inside air backward flow.

Background

The centrifugal fan increases the gas pressure through the input mechanical energy, and the machine for exhausting the gas is widely used in different industries along with the development of society, such as mines, tunnels, cooling towers, vehicles, ships, buildings and the like, mainly realizes the functions of ventilation, dust exhaust, cooling and the like in different working spaces, and is also applied to inflating and propelling products.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model aims at providing a centrifugal fan's technical field refers in particular to a prevent centrifugal fan of inside air backward flow through step structure avoids backward flow and improvement fan efficiency.

Realize above-mentioned purpose, the utility model discloses a technical scheme be: the utility model provides a prevent centrifugal fan of inside air backward flow, includes air-out net, centrifugal wind wheel and wind channel shell, the air-out screen panel is located on the wind channel shell to mutually support and form inside wind chamber, centrifugal wind wheel rotationally install in the wind chamber, the wind channel shell include integrated into one piece's bottom plate with set up in lateral wall on the bottom plate, the bottom plate is provided with outside bellied step boss, the boss with the bottom plate form each other communicate in the inside draw-in groove in wind chamber, centrifugal wind wheel inlays to be located in the draw-in groove.

Preferably, the bottom of the centrifugal wind wheel is provided with an air inlet, and the boss is provided with a vent communicated with the air inlet.

Preferably, the air outlet net is provided with a plurality of air outlets penetrating through the wall thickness of the air outlet net, the air outlets are uniformly distributed on the air outlet net in an array mode, and the air outlets are communicated with the air cavity.

Preferably, a certain distance is reserved between the bottom of the centrifugal wind wheel and the inner surface of the boss.

Preferably, an extension line of the inner surface of the bottom plate is flush with the inner surface of the centrifugal wind wheel bottom.

Preferably, an extension of the inner surface of the bottom plate is located between the inner surface and the outer surface of the centrifugal wind wheel bottom.

Preferably, the centrifugal wind wheel is provided with an inner cavity communicated with the air inlet, the air duct shell is provided with a hollow accommodating cavity, and the inner cavity is communicated with the accommodating cavity.

The beneficial effects of the utility model embody: the utility model aims at providing a prevent centrifugal fan of inside air backward flow sets up the backward flow structure of step through the bottom at the fan, sets up centrifugal wind wheel wholly in the inside draw-in groove of wind channel shell to cut off the route of gas reflux, prevent that the air current from getting back to centrifugal wind wheel's vent department again and carry out invalid circulation, thereby avoid the output volume reduction of the fan that leads to of backward flow, improved whole work efficiency.

Drawings

Fig. 1 is a cross-sectional view of the whole internal structure of the utility model.

Fig. 2 is the utility model discloses the air-out passageway with not have the schematic diagram in gas reflux wind channel when anti-return structure.

Reference is made to the accompanying drawings in which:

1-air outlet net; 2-centrifugal wind wheel; 3-an air duct shell; 4-air cavity; 5-a bottom plate; 6-side wall; 7-a boss; 8-a clamping groove; 9-air inlet; 10-a vent; 11-an air outlet; 12-lumen; 13-a containment chamber; 14-an air outlet channel; 15-return air duct.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

as shown in fig. 1, a prevent centrifugal fan of inside air backward flow, including air-out net 1, centrifugal wind wheel 2 and wind channel shell 3, air-out net 1 cover is located on the wind channel shell 3 to mutually support and form inside wind chamber 4, centrifugal wind wheel 2 rotationally install in wind chamber 4, wind channel shell 3 include integrated into one piece's bottom plate 5 with set up in lateral wall 6 on the bottom plate 5, bottom plate 5 is provided with outside bellied step boss 7, boss 7 with bottom plate 5 mutually form communicate in the inside draw-in groove 8 of wind chamber 4, centrifugal wind wheel 2 inlays to be located in draw-in groove 8.

Preferably, the bottom of the centrifugal wind wheel 2 is provided with an air inlet 9, and the boss 7 is provided with a vent 10 communicated with the air inlet 9.

Preferably, the air-out net 1 is provided with a plurality of air outlets 11 penetrating through the wall thickness of the air-out net 1, the air outlets 11 are uniformly distributed on the air-out net 1 in an array manner, and the air outlets 11 are communicated with the air cavity 4.

Preferably, the centrifugal wind wheel 2 has a certain distance between the bottom and the inner surface of the boss 7.

Preferably, the extension line of the inner surface of the bottom plate 5 is flush with the inner surface of the bottom of the centrifugal wind wheel 2.

Preferably, the extension line of the inner surface of the bottom plate 5 is located between the inner surface and the outer surface of the bottom of the centrifugal wind wheel 2.

Preferably, the centrifugal wind wheel 2 is provided with an inner cavity 12 communicated with the air inlet 9, the air duct shell 3 is provided with a hollow accommodating cavity 13, and the inner cavity 12 is communicated with the accommodating cavity 13.

The utility model relates to a prevent inside air reflux's centrifugal fan, including air-out net 1, centrifugal wind wheel 2 and wind channel shell 3, be provided with hollow installation cavity in the wind channel shell 3, air-out net 1 whole cover locates the top of wind channel shell 3, and its mutually supports and connects and form the wind chamber 4 that is used for the circulation of gas in inside, and centrifugal wind wheel 2 rotationally installs in this wind chamber 4.

Further, wind channel shell 3 include integrated into one piece's bottom plate 5 with set up in lateral wall 6 on the bottom plate 5 edge, thereby go out the top that wind net 1 and lateral wall 6 lock joint each other and fix at wind channel shell 3, integrated into one piece ground is provided with outside bellied step form boss 7 on wind channel shell 3's bottom plate 5, has formed inside draw-in groove 8 at the inboard of bottom plate 5 by its step form boss 7, and centrifugal wind wheel 2 card in wind chamber 4 is located in this draw-in groove 8, causes centrifugal wind wheel 2 whole embedding to in bottom plate 5.

Further, the bottom of the centrifugal wind wheel 2 is provided with an air inlet 9, the boss 7 is provided with a vent 10 communicated with the air inlet 9, and through the stepped backflow preventing structure of the bottom plate 5 and the centrifugal wind wheel 2, the extension line of the inner surface of the bottom plate 5 and the inner surface of the bottom of the centrifugal wind wheel 2 are positioned on the same horizontal plane, or the extension line of the inner surface of the bottom plate 5 is positioned between the inner surface and the outer surface of the bottom of the centrifugal wind wheel 2, so that a backflow air duct 15 formed when the traditional centrifugal wind wheel 2 is positioned above the bottom plate 5 is cut off, and the stepped structure blocks the flow of backflow air.

Further, as shown in fig. 2, the air outlet channel 14 for the centrifugal fan to normally supply air is respectively composed of a vent 10, an air inlet 9, an inner cavity 12 of the centrifugal wind wheel 2, an air cavity 4 and an air outlet 11 which are sequentially communicated with each other, and the return air channel 15 without the backflow prevention structure is respectively composed of a vent 10, an air inlet 9, an inner cavity 12 of the centrifugal wind wheel 2 and an air cavity 4 which are sequentially communicated with each other.

Specifically, when the centrifugal fan operates, airflow enters the inside of the centrifugal fan from the vent 10 of the air duct shell 3 and the air inlet 9 of the centrifugal fan 2 which are communicated with each other, when the centrifugal fan 2 rotates at a high speed, a certain amount of output is performed on the airflow inside the centrifugal fan, most of the air flow flows from the inner cavity 12 of the centrifugal fan 2 to the air cavity 4 which is communicated with the centrifugal fan, and then is output to the outside of the centrifugal fan from the air outlet 11 of the air outlet net 1 through the air cavity 4, while the other part of the air is shunted in the air cavity 4, and is sucked back to the air inlet 9 of the centrifugal fan 2 through the backflow air duct 15 for ineffective circulation, so that the loss of the output air flow is caused, the efficiency of the centrifugal fan is low, and in order to improve the defect, the centrifugal fan 2 originally located above the bottom plate 5 is embedded into the clamping groove 8 of the bottom plate 5 through the stepped backflow prevention structure, the backflow air duct 15 is blocked by the centrifugal wind wheel 2 body, so that the air flow which flows back to the air inlet 9 along the backflow air duct 15 originally can not pass through the backflow air duct 15, the air flow returns to the air cavity again and is output by the centrifugal wind wheel 2, and the dual functions of improving the air supply amount and preventing backflow are achieved.

The above, it is only the preferred embodiment of the present invention, not right the technical scope of the present invention makes any restriction, the technical personnel of the industry, under this technical scheme's enlightenment, can do some deformation and modification, all the basis the utility model discloses a technical essence is to any modification, the equivalent change and the modification of the above embodiment do, all still belong to the technical scheme's scope of the present invention.

Claims

1. The utility model provides a prevent inside air backflow's centrifugal fan, includes air-out net, centrifugal wind wheel and wind channel shell, the air-out screen panel is located on the wind channel shell to mutually support and form inside wind chamber, centrifugal wind wheel rotationally install in the wind chamber, its characterized in that: the air duct shell comprises an integrally formed bottom plate and a side wall arranged on the bottom plate, the bottom plate is provided with a step-type boss protruding outwards, the boss and the bottom plate are mutually communicated with an internal clamping groove of the air cavity, and the centrifugal wind wheel is embedded in the clamping groove.

2. The centrifugal fan for preventing backflow of internal air according to claim 1, wherein: the bottom of the centrifugal wind wheel is provided with an air inlet, and the boss is provided with a vent communicated with the air inlet.

3. The centrifugal fan for preventing backflow of internal air according to claim 2, wherein: the air outlet net is provided with a plurality of air outlets penetrating through the wall thickness of the air outlet net, the air outlets are uniformly distributed on the air outlet net in an array mode, and the air outlets are communicated with the air cavity.

4. The centrifugal fan for preventing backflow of internal air according to claim 2, wherein: and a certain distance is reserved between the bottom of the centrifugal wind wheel and the inner surface of the boss.

5. The centrifugal fan for preventing backflow of internal air according to claim 2, wherein: the extension line of the inner surface of the bottom plate is flush with the inner surface of the bottom of the centrifugal wind wheel.

6. The centrifugal fan for preventing backflow of internal air according to claim 2, wherein: the extension line of the inner surface of the bottom plate is positioned between the inner surface and the outer surface of the bottom of the centrifugal wind wheel.

7. The centrifugal fan for preventing backflow of internal air according to claim 2, wherein: the centrifugal wind wheel is provided with an inner cavity communicated with the air inlet, the air duct shell is provided with a hollow accommodating cavity, and the inner cavity is communicated with the accommodating cavity.