CN204591726U - A kind of double-layered cylinder induced draught fan - Google Patents

Abstract

The utility model discloses a double-deck cylindrical induced draft fan, which comprises a motor, the motor is connected with one end of the output shaft of the motor, the other end of the output shaft of the motor is connected with a fan, the output shaft of the motor is coaxially sleeved with a hollow shaft, and the hollow shaft An airflow dynamic fan is installed on the top, and the blades of the airflow dynamic fan are bent longitudinally. An outer sleeve and an inner sleeve are installed coaxially between the airflow dynamic fan and the fan. Ribs are installed, and the ribs are bent longitudinally. The bending direction of the ribs is opposite to that of the blades of the aerodynamic fan. The outer sleeve is a trumpet-shaped rotary structure. The utility model installs the air flow power fan, the outer sleeve and the rib plate, so that the induced draft fan can work normally with the help of natural wind force to promote the smoke to be discharged outside when the electric energy is not connected, which not only saves energy, but also makes the device more flexible. sex.

Description

A double-deck cylindrical induced draft fan

technical field

The utility model belongs to the technical field of fluid mechanical equipment, in particular to a double-deck cylindrical induced draft fan.

Background technique

A household induced draft fan is a device that is installed above the chimney on the roof and looks like a small electric fan. It is generally placed upside down above the chimney on the roof. When the electric energy is applied to it, the fan blades will rotate, and the smog in the chimney is drawn to the outside, and the electric energy is often used to work when a fire is cooking and there is smoke in the room. However, in the absence of electric energy, since the fan blades occupy a certain area in the flue, it will block the discharge of smoke.

Utility model content

The purpose of the utility model is to provide a double-layer cylindrical induced draft fan, which solves the problem that the existing domestic induced draft fan can only use electric energy to work, and cannot promote the discharge of smoke when the electric energy is not connected.

The technical scheme adopted in the utility model is: a double-layer cylindrical induced draft fan, including a motor, the motor is connected to one end of the motor output shaft, the other end of the motor output shaft is connected to the fan, and the outer coaxial sleeve of the motor output shaft has A hollow shaft, on which an airflow power fan is installed, the blades of the airflow power fan are bent longitudinally, an outer sleeve and an inner sleeve are installed coaxially between the air flow power fan and the fan, and the outer sleeve and the inner sleeve Ribs are installed between the layer sleeves, the ribs are bent longitudinally, and the bending direction of the ribs is opposite to that of the aerodynamic fan blades, and the outer sleeve is a trumpet-shaped rotary structure.

The utility model is also characterized in that:

The two bottom edges in the longitudinal direction of the rib are inwardly depressed, and the lengths of the two bottom edges are not equal, wherein the shorter bottom edge is connected with the outer sleeve, and the longer bottom edge is connected with the inner sleeve. cylinder connected.

There are at least four ribs and they are evenly distributed around the output shaft of the motor.

The exterior of the airflow powered fan is fitted with a blade housing.

The small end of the outer sleeve is connected with the blade casing, and the large end is connected with the rib.

A bearing a is installed at a position close to the motor on the output shaft of the motor, and the bearing a is a deep groove ball bearing.

A bearing b is installed on the lower end of the hollow shaft, and the bearing b is a thrust ball bearing.

A gasket and a nut are installed below the bearing b for fixing.

A motor casing is installed outside the motor, and a rain cover is installed on the upper end of the motor casing.

The beneficial effect of the utility model is that a double-layer cylindrical induced draft fan of the utility model is installed with an airflow dynamic fan, an outer sleeve and a rib plate, so that the induced draft fan can be operated normally by means of natural wind force when it is not connected to electric energy. Working to facilitate the exit of smoke to the outside not only saves energy but also makes the unit more flexible.

Description of drawings

Fig. 1 is the structural representation of a kind of double-deck cylinder induced draft fan of the present utility model;

Fig. 2 is a sectional view of a motor output shaft and a hollow shaft in a double-deck cylindrical induced draft fan of the present invention;

Fig. 3 is the front view of a double-deck cylindrical induced draft fan of the present invention;

Fig. 4 is a schematic diagram of the shape of ribs in a double-deck cylindrical induced draft fan of the present invention;

Fig. 5 is an oblique bottom view of a double-layer cylindrical induced draft fan of the present invention.

In the figure, 1. Motor, 2. Airflow power fan, 3. Bearing a, 4. Motor output shaft, 5. Hollow shaft, 6. Bearing b, 7. Outer sleeve, 8. Rib plate, 9. Inner layer Sleeve, 10. blade casing, 11. motor casing, 12. rain cover, 13. fan, 14. spacer, 15. nut, 16. airflow blowing inlet, 17. airflow blowing outlet.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

A kind of double-deck cylinder induced draft fan of the utility model, as shown in Figure 1, Fig. 2, comprises motor 1, and motor housing 11 is installed outside motor 1, and the upper end of motor housing 11 is equipped with rain-shielding cover 12. The motor 1 is connected to one end of the motor output shaft 4, as shown in Figure 5, the other end of the motor output shaft 4 is connected to the fan 13, and a bearing a3 is installed on the motor output shaft 4 close to the motor 1, and the bearing a3 is a deep groove ball bearings. The outer coaxial socket of the motor output shaft 4 is provided with a hollow shaft 5, and the airflow power fan 2 is installed on the hollow shaft 5. The lower end of 5 is equipped with bearing b6, and bearing b6 is a thrust ball bearing, and gasket 14 and nut 15 are installed below bearing b6 to fix. As shown in Figure 3, an outer sleeve 7 and an inner sleeve 9 are coaxially installed sequentially between the air flow power fan 2 and the fan 13, and at least four sleeves are installed between the outer sleeve 7 and the inner sleeve 9. There are two ribs 8, and the ribs 8 are evenly distributed around the motor output shaft 4. The outer sleeve 7 is a trumpet-shaped rotary structure, its small end is connected with the blade shell 10, and its large end is connected with the rib 8; as shown in Figure 4, the rib 8 is an irregular quadrilateral, and its longitudinal two Both bases are sunken inward, the lengths of these two bases are not equal, and the quadrilateral is bent longitudinally as a whole, wherein the shorter base is connected with the outer sleeve 7, and the longer base is connected with the inner sleeve 9 connected. The bending direction of the rib plate 8 is opposite to the bending direction of the blades of the aerodynamic fan 2 mentioned above.

The household induced draft fan of the present utility model is installed vertically on the roof of the house. When installing, the inner layer sleeve 9 is set on the chimney of the roof. When the electric energy is supplied, the motor 1 drives the fan 13 to rotate through the motor output shaft 4. Exhaust the smoke in the house to the outside, at this time, it works in the same way as the ordinary induced draft fan. When the household induced draft fan of the present utility model is not energized, when the roof has a horizontal airflow passing through, the airflow blown to the induced draft fan passes from the interlayer area between the inner layer sleeve 9 and the outer layer sleeve 7, that is, After the airflow shown in Fig. 1 flows in at the inlet 16, the rib plate 8 is bent longitudinally as a whole through the rib plate 8, which will convert the air flow into the direction of rotation, and because of the bending direction of the airflow power fan 2 blades and the rib plate 8 The bending direction is opposite, and the airflow will blow on the blades of the airflow dynamic fan 2 in an approximately vertical direction; Therefore can produce acceleration effect to air-flow, so kinetic energy increases, and when air-flow is blown out from air-flow outlet 17, the one, the blade that can blow air-flow power fan 2 rotates, and the smog in the chimney is discharged; After acceleration, the flow speed will increase, and the air pressure will decrease at the same time, and the smoke flow rate in the chimney is low, so the air pressure is higher, so the smoke will flow from the chimney with higher air pressure to the lower air pressure at the upper part, which is conducive to the discharge of smoke.

Claims (9)

1. A double-deck cylinder induced draft fan, comprising a motor (1), the motor (1) is connected to one end of the motor output shaft (4), and the other end of the motor output shaft (4) is connected to the fan (13), characterized in that , the outer coaxial sleeve of the motor output shaft (4) is provided with a hollow shaft (5), and the airflow power fan (2) is installed on the hollow shaft (5). The blades of the airflow power fan (2) are bent along the longitudinal direction. An outer sleeve (7) and an inner sleeve (9) are coaxially installed sequentially between the fan (2) and the fan (13), and the outer sleeve (7) and the inner sleeve (9) are installed There are ribs (8), the ribs (8) are bent longitudinally, the bending direction of the ribs (8) is opposite to the bending direction of the blades of the aerodynamic fan (2), and the outer sleeve (7) It is a trumpet-shaped structure of revolution. 2. A kind of double-deck cylindrical induced draft fan according to claim 1, characterized in that, the two longitudinal bottom edges of the rib plate (8) are inwardly recessed, and the lengths of the two bottom edges are unequal, Wherein the shorter base is connected with the outer sleeve (7), and the longer base is connected with the inner sleeve (9). 3. A double-layer cylindrical induced draft fan according to claim 2, characterized in that at least four ribs (8) are arranged and evenly distributed around the motor output shaft (4). 4. A double-deck cylindrical induced draft fan according to claim 1, characterized in that a blade casing (10) is installed on the outside of the airflow dynamic fan (2). 5. A double-layer cylindrical induced draft fan according to claim 4, characterized in that the small end of the outer sleeve (7) is connected to the blade shell (10), and the large end is connected to the rib (8) . 6. A double-deck cylindrical induced draft fan according to claim 1, characterized in that, a bearing a (3) is installed at a position close to the motor (1) on the output shaft (4) of the motor, and the bearing a (3) ) is a deep groove ball bearing. 7. A double-deck cylindrical induced draft fan according to claim 1, characterized in that a bearing b (6) is installed on the lower end of the hollow shaft (5), and the bearing b (6) is a thrust ball bearing. 8. A double-layer cylindrical induced draft fan according to claim 7, characterized in that, a gasket (14) and a nut (15) are installed under the bearing b (6) for fixing. 9. A double-deck cylindrical induced draft fan according to claim 1, characterized in that, a motor casing (11) is installed outside the motor (1), and a rain cover (12) is installed on the upper end of the motor casing (11) ).