CN111350648A

CN111350648A - Exhaust fan

Info

Publication number: CN111350648A
Application number: CN202010304708.1A
Authority: CN
Inventors: 邹伟恩
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2020-06-30

Abstract

The invention relates to an exhaust fan, which comprises a shell, blades, a rotating shaft and a base, wherein the blades are arranged on the shell; the center position of the shell of the base is connected to the corresponding position on the inner wall of the shell after radiating to the periphery through a plurality of connecting strips; the rotating shaft is rotatably arranged on the base, the front part and the rear part of the rotating shaft extend out of the outer side of the base, and a driving device for driving the rotating shaft to rotate is arranged in the base; the blade is fixedly sleeved at the rear part of the rotating shaft and is used for pumping air along with the rotation of the rotating shaft, and a second air exchange mechanism used for pumping air along with the rotation of the rotating shaft is further arranged in the rotating shaft. The invention has the beneficial effects that: the second air exchange mechanism except the blades can improve the air exchange speed of the exhaust fan and realize that air can be quickly exchanged.

Description

Exhaust fan

Technical Field

The invention relates to the field of air exchange equipment, in particular to an exhaust fan.

Background

The exhaust fan is one of common devices for ventilation, and is widely used in toilets, production workshops and the like to exhaust internal air to replace new air, thereby ensuring air quality. The existing exhaust fan generally realizes air suction and exchange only through blade rotation, and the air exchange speed is too low in some times, so that the requirements of life and production cannot be met.

Disclosure of Invention

In summary, in order to overcome the deficiencies of the prior art, the present invention provides an exhaust fan.

The technical scheme for solving the technical problems is as follows: an exhaust fan comprises a shell, blades, a rotating shaft and a base; the center position of the shell of the base is connected to the corresponding position on the inner wall of the shell after radiating to the periphery through a plurality of connecting strips; the rotating shaft is rotatably arranged on the base, the front part and the rear part of the rotating shaft extend out of the outer side of the base, and a driving device for driving the rotating shaft to rotate is arranged in the base; the blade is fixedly sleeved at the rear part of the rotating shaft and is used for pumping air along with the rotation of the rotating shaft, and a second air exchange mechanism used for pumping air along with the rotation of the rotating shaft is further arranged in the rotating shaft.

The invention has the beneficial effects that: the second air exchange mechanism except the blades can improve the air exchange speed of the exhaust fan and realize that air can be quickly exchanged.

On the basis of the technical scheme, the invention can be further improved as follows:

further, the second ventilation mechanism comprises a spiral groove and an inner rod; the rotating shaft is of a hollow structure, and the spiral groove is positioned on the inner wall of the rotating shaft; the inner rod is assembled in the rotating shaft in an interference mode, and a spiral channel for pumping and exchanging air along with the rotation of the rotating shaft is formed between the outer side wall of the inner rod and the spiral groove.

The beneficial effect of adopting the further technical scheme is as follows: when the rotating shaft rotates to ventilate, air is pumped and exchanged through the rotating shaft, and ventilation outside the blades is achieved.

Further, the rotating shaft is an internal threaded pipe.

The beneficial effect of adopting the further technical scheme is as follows: the processing of the rotating shaft can be completed by tapping the hollow rotating shaft through the existing equipment, new processing equipment does not need to be opened, and the production cost is reduced.

Further, the driving device comprises a motor, a first gear and a second gear; the first gear is fixedly sleeved on the rotating shaft and corresponds to the position in the base, the motor is fixed inside the base, the output end of the motor is connected with the second gear, and the second gear is meshed with the first gear.

The beneficial effect of adopting the further technical scheme is as follows: the driving of the rotating shaft is realized.

Furthermore, the front side of the shell is provided with a grid plate which prevents foreign matters from entering the shell and damaging the blades.

The beneficial effect of adopting the further technical scheme is as follows: preventing foreign matter from entering the housing.

Drawings

FIG. 1 is a front view of the present invention (with the grid plate removed);

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is an enlarged view of the shaft and the inner rod of FIG. 2;

wherein the arrows indicate the flow direction of the air.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the device comprises a shell, 2, blades, 3, a rotating shaft 4, a base, 5, a connecting strip, 6, a spiral groove, 7, an inner rod, 8, a motor, 9, a first gear, 10, a second gear, 11 and a grid plate.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 and 2, an exhaust fan includes a housing 1, a vane 2, a rotary shaft 3, and a base 4. The base 4 is connected to the corresponding position on the inner wall of the shell 1 after radiating to the periphery through a plurality of connecting strips 5 at the central position of the shell 1. The rotating shaft 3 is rotatably mounted on the base 4, the front part and the rear part of the rotating shaft 3 both extend out of the outer side of the base 4, and a driving device for driving the rotating shaft 3 to rotate is arranged in the base 4. The drive means comprise a motor 8, a first gear 9 and a second gear 10. The first gear 9 is fixedly sleeved on the rotating shaft 3 and corresponds to the position in the base 4, the motor 8 is fixed in the base 4, the output end of the motor is connected with the second gear 10, and the second gear 10 is meshed with the first gear 9. The fixed suit of blade 2 is in the rear portion of pivot 3 and along with the rotation of pivot 3 is taken out and is traded the air, the front side of shell 1 is equipped with prevents that the foreign matter from getting into damage in the shell 1 the grid plate 11 of blade 2.

And a second air exchange mechanism for extracting and exchanging air along with the rotation of the rotating shaft 3 is also arranged in the rotating shaft 3. As shown in fig. 3, the second ventilation mechanism includes a spiral groove 6 and an inner rod 7. The rotating shaft 3 is of a hollow structure, and the spiral groove 6 is located on the inner wall of the rotating shaft 3. The inner rod 7 is assembled in the rotating shaft 3 in an interference mode, and a spiral channel for pumping and exchanging air along with the rotation of the rotating shaft 3 is formed between the outer side wall of the inner rod and the spiral groove 6. Preferably: the rotating shaft 3 is an internal threaded pipe.

When the exhaust fan works, the output of the motor 8 drives the first gear 9 to rotate, and the second gear 10 synchronously rotates after the first gear 9 rotates and drives the rotating shaft 3 to rotate. After the rotating shaft 3 rotates, the blade 2 is driven to rotate to pump air on the one hand, and the air is pumped by the spiral channel inside the rotating shaft in addition, which is as follows:

when the rotating shaft 3 rotates at a high speed, the rotating shaft drives the spiral channel to rotate at a high speed, and the linear speed v at the inlet of the front end of the spiral channel can be expressed as the product of the rotating angular speed omega and the radius R of the spiral pipeline. If the shaft 3 is placed in air, which can be regarded as the shaft 3 being stationary, the air is flushed into the spiral channel at a flow velocity v. When the air reaches the rear end outlet through the spiral channel, the air is thrown out to the periphery under the action of centrifugal force, and then the air is pumped and exchanged. Through the above-mentioned design to pivot 3, owing to have the second mechanism of taking a breath outside blade 2, strengthened exhaust fan's the speed of taking a breath, be favorable to taking out fast of air and trade. In addition, the second air exchange mechanism is combined with the rotating shaft 3 of the exhaust fan, so that the exhaust fan can work and simultaneously has the capacity of the second air exchange mechanism, the corresponding mechanism design is not required to be additionally added, and the production cost is reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. An exhaust fan is characterized by comprising a shell (1), blades (2), a rotating shaft (3) and a base (4); the base (4) is arranged at the center of the shell (1) and is connected to the corresponding position on the inner wall of the shell (1) after radiating towards the periphery through a plurality of connecting strips (5); the rotating shaft (3) is rotatably arranged on the base (4), the front part and the rear part of the rotating shaft (3) extend out of the outer side of the base (4), and a driving device for driving the rotating shaft (3) to rotate is arranged in the base (4); the fixed suit of blade (2) is in the rear portion of pivot (3) and along with the rotation of pivot (3) is taken out and is traded the air still be equipped with in pivot (3) along with the rotation of pivot (3) is taken out and is traded the second mechanism of taking a breath of air.

2. An exhaust fan according to claim 1, characterized in that said second ventilation means comprise a helical groove (6) and an inner rod (7); the rotating shaft (3) is of a hollow structure, and the spiral groove (6) is positioned on the inner wall of the rotating shaft (3); the inner rod (7) is assembled in the rotating shaft (3) in an interference mode, and a spiral channel for pumping air along with the rotation of the rotating shaft (3) is formed between the outer side wall of the inner rod and the spiral groove (6).

3. An exhaust fan according to claim 2, characterized in that the shaft (3) is an internally threaded tube.

4. An exhaust fan according to claim 1, characterized in that said driving means comprise a motor (8), a first gear (9) and a second gear (10); first gear (9) fixed suit is in on pivot (3) and correspond position in base (4), motor (8) are fixed inside base (4), and its output is connected with second gear (10), and second gear (10) with first gear (9) meshing.

5. An exhaust fan according to any of claims 1-4, characterized in that the front side of the casing (1) is provided with a grid plate (11) preventing foreign objects from entering the casing (1) and damaging the blades (2).