CN113464477B

CN113464477B - Axial flow fan with hood

Info

Publication number: CN113464477B
Application number: CN202110941169.7A
Authority: CN
Inventors: 王民; 方胜良; 俞志青; 叶永波
Original assignee: Zhejiang Zheke Wind Turbine Co ltd
Current assignee: Zhejiang Zheke Wind Turbine Co ltd
Priority date: 2021-08-17
Filing date: 2021-08-17
Publication date: 2023-09-08
Anticipated expiration: 2041-08-17
Also published as: CN113464477A

Abstract

The invention relates to an axial flow fan with a hood, which comprises a hood, an air duct and a motor, wherein the hood is sleeved on the air duct, the motor is arranged in the air duct, a fan blade is arranged on a motor shaft, the hood and the air duct are connected through a pin, the pin is abutted against the outer end of a cross rod, the inner end of the cross rod is abutted against the motor shaft, and a spring is matched on the pin. Under normal conditions, the hood is connected to the air duct to play a role in rain prevention and ventilation. When a fire alarm occurs, the motor drives the fan blade, the motor shaft is separated from the cross rod, the cross rod is separated from the pin, and the pin is separated from the hood and the air duct under the action of the spring. The rotating fan blade drives the hood to separate from the air duct. Therefore, the wind cap does not block the wind barrel any more, and the air flow generated by the fan blade can discharge the indoor smoke upwards and linearly, so that the rapid smoke discharge is facilitated.

Description

Axial flow fan with hood

Technical Field

The invention relates to fire-fighting equipment, in particular to a smoke exhaust fan arranged on a roof.

Background

The axial flow fan is arranged on the roof and is used for fire control and smoke exhaust. The wind cap is arranged above the axial flow fan for rain protection, and the indoor air and the outdoor air flow through the air passage beside the wind cap. However, when a fire alarm occurs, the hood makes the air flow generated by the fan not be discharged upwards in a straight line, and the following disadvantages are generated: firstly, air flow generated by a fan impacts on a hood, and possibly flows back into an air duct to form backflow; and secondly, the air flow generated by the fan can be discharged through the air outlet structure at the side of the hood, the path of the air flow discharged is roundabout, the path of the air flow discharged is longer, and the exhaust efficiency is low.

Disclosure of Invention

The technical problems solved by the invention are as follows: the axial flow fan can automatically separate the hood when a fire alarm occurs.

In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides an axial fan with hood, includes hood, dryer and motor, and the hood cover is established on the dryer, and the motor setting is in the dryer, installs the fan blade on the motor shaft, and hood and dryer pass through pin connection, and the pin offsets with the outer end of horizontal pole, and the inner of horizontal pole offsets with the motor shaft, and the supporting spring that has on the pin, the spring makes the pin have break away from hood and dryer and to the trend that the dryer center moved.

Under normal conditions, the hood is connected to the air duct to play a role in rain prevention and ventilation. When a fire disaster occurs, the motor starts to act, and when the fan blade is driven, the rotating motor shaft makes the cross rod incline and then separate from the contact with the inner end of the cross rod, so that the outer end of the cross rod is separated from the contact with the pin, the pin ejects towards the center direction of the air duct under the action of the spring, and the pin is separated from the hood and the air duct. The rotating fan blade drives the air flow in the air duct to directly rise, and the air flow drives the hood to rise and separate from the air duct. Therefore, the wind cap does not block the wind barrel any more, and the air flow generated by the fan blade discharges the indoor smoke upwards and linearly.

The roof fan for fire control adopts the traditional hood for waterproofing, and when fire occurs, the hood is separated from the connection of the air duct by the motor which should rotate, and the air flow of the fan can be exhausted rapidly.

Drawings

The invention is further described with reference to the accompanying drawings:

FIG. 1 is a schematic view of an axial flow fan with a hood;

FIG. 2 is an enlarged view of FIG. 1 at A;

fig. 3 is a schematic view of fig. 1 looking down on the abutment of the threaded sleeve 43 and the cross bar 41.

The symbols in the drawings illustrate:

10. a hood;

20. an air duct; 21. reinforcing ribs; 22. a bearing seat; 23. a connecting rod; 24. a base;

30. a motor; 31. a fan blade; 32. a large diameter section; 33. a small diameter section;

40. a pin; 401. the tail edge of the pin; 41. a cross bar; 42. a spring; 43. a thread sleeve; 430. a convex structure;

50. and a wind shaft.

Detailed Description

Referring to fig. 1 and 2, an axial flow fan with a hood comprises a hood 10, an air duct 20 and a motor 30, wherein the hood is sleeved on the air duct, the motor is arranged in the air duct, a fan blade 31 is arranged on a motor shaft, the hood and the air duct are connected through a pin 40, the pin abuts against the outer end of a cross rod 41, the inner end of the cross rod abuts against the motor shaft, and a spring 42 is matched with the pin, so that the pin has a trend of moving towards the center of the air duct after being separated from the hood and the air duct.

The bottom of dryer 10 is equipped with base 24, and the base is installed on the wind shaft 50 on roof, and the dryer is penetrating from top to bottom, takes the vertical form. The motor 30 is connected with the inner side wall of the wind drum through the connecting rod 23. The motor is connected with the main control board, and the main control board is connected domestic power, and the smoke sensing probe is connected with the main control board electricity, and the smoke sensing probe can be installed indoor, also can install on the dryer, when it inducts smog, to main control board send signal, main control board control motor is rotatory.

Under normal conditions, the hood 10 is connected to the wind barrel 20 to play a role in rain prevention and ventilation. The spring 42 is in a compressed state. When a fire alarm occurs, the motor 30 starts to act, and when the fan blade 31 is driven, the rotating motor shaft makes the cross rod 41 skew and then separate from the contact with the inner end of the cross rod, so that the outer end of the cross rod is separated from the pin 40, the pin ejects towards the center direction of the air duct 20 under the action of the spring 42, the pin is separated from the hood 10 and the air duct 20, and the hood and the air duct are in a separated state. The rotating fan blades 31 drive the air flow in the air duct to directly rise, and the air flow drives the hood to rise and separate from the air duct. Therefore, the wind cap does not block the wind barrel any more, and the air flow generated by the fan blade discharges the indoor smoke upwards and linearly.

Preferably, the hood 10 is made of a lightweight plastic material, and is easily lifted up along the air duct to be completely separated from the air duct by the fan blade 31 after being disconnected from the air duct 20.

Alternatively, the number of pins 40 is equal to the number of pins, and is uniformly distributed along the circumference of the hood 10, and accordingly, the number of cross bars 41 is equal to the number of pins. The inner ends of all the cross bars are propped against the motor shaft. Alternatively, the number of pins is two, 180 degrees apart, and correspondingly the number of crossbars 41 is two.

As an improvement, the inner end of the cross bar 41 is abutted against the motor shaft by a threaded sleeve 43 which is screwed on the motor shaft. Due to the presence of the spring 42, the cross bar 41 is braced against the motor shaft and if the power of the motor 30 is small, the motor may not be able to drive the motor shaft against the force of the cross bar against the motor shaft. After the threaded sleeve 43 is arranged between the cross bar and the motor shaft, the situation that the motor cannot overcome the acting force of the cross bar 41 on the motor shaft to drive the motor shaft to rotate does not exist. Specifically, the motor shaft rotates, and the friction force of the cross bar 41 against the thread bush 43 makes the thread bush not rotate along with the motor shaft, so that the motor shaft drives the thread bush to rise or fall until the thread bush is separated from the cross bar. Thus, the cross bar 41 can be passively released from the pin 40 when the motor 30 is operated, and the pin can be released from the connection between the hood 10 and the duct 20.

The hood 10 is provided with a first pin hole, the air duct 20 is provided with a second pin hole, the pin 40 passes through the second pin hole and the first pin hole from the inside of the air duct to the outside of the air duct, one end of the spring 42 is propped against the inner side wall of the air duct, the other end of the spring is propped against the edge 401 of the tail part of the pin, and the outer end of the cross rod is propped against the tail part of the pin.

Referring to fig. 1 and 3, the outer side wall of the threaded sleeve 43 is provided with a convex structure 430, and the inner end of the cross bar 41 is pressed between two adjacent convex structures. Normally, the motor 30 is not operated, and the contact between the inner end of the cross rod and the threaded sleeve 43 is stable due to the convex structure, so that the cross rod cannot be separated from the threaded sleeve. Further, the pin 40 is stably limited by the cross bar, and the hood 10 and the duct 20 are stably connected.

As shown in FIG. 1, the motor shaft comprises a large-diameter section 32 and a small-diameter section 33 positioned above the large-diameter section, a threaded sleeve 43 is in threaded connection with the large-diameter section, and the fan blades 31 are arranged on the small-diameter section. That is, the screw sleeve and the cross bar 41 are all positioned below the fan blade 31, and after the cross bar 41 is separated from the screw sleeve 43 and the pin 40 is separated from the hood 10 and the air duct 20, the falling cross bar, pin and spring do not interfere with the normal operation of the fan blade 31.

As an improvement, a reinforcing rib 21 is arranged in the air duct 20, a bearing seat 22 is arranged on the reinforcing rib, and the top of a motor shaft is pivoted in the bearing seat. In this way, the position of the motor shaft is stable, especially in case the motor shaft is subjected to radial forces of several crossbars 41 in different directions.

The foregoing is merely illustrative of the preferred embodiments of the present invention, and modifications in detail will readily occur to those skilled in the art based on the teachings herein without departing from the spirit and scope of the invention.

Claims

1. The utility model provides an axial fan with hood, includes hood (10), dryer (20) and motor (30), and the hood cover is established on the dryer, and the motor setting is in the dryer, installs fan blade (31), its characterized in that on the motor shaft: the hood and the air duct are connected through a pin (40), the pin is propped against the outer end of the cross rod (41), the inner end of the cross rod is propped against the motor shaft, a spring (42) is matched with the pin, and the spring enables the pin to have a trend of moving towards the center of the air duct after being separated from the hood and the air duct;

the inner end of the cross rod (41) is propped against the motor shaft through a thread sleeve (43), and the thread sleeve is in threaded connection with the motor shaft;

the fan cap (10) is provided with a first pin hole, the fan drum (20) is provided with a second pin hole, the pin (40) penetrates through the second pin hole and the first pin hole from the inside of the fan drum to the outside of the fan drum, one end of the spring (42) is propped against the inner side wall of the fan drum, the other end of the spring is propped against the edge (401) of the tail part of the pin, and the outer end of the cross rod is propped against the tail part of the pin.

2. An axial flow fan provided with a hood as defined in claim 1, wherein: the outer side wall of the thread sleeve (43) is provided with a convex structure (430), and the inner end of the cross rod (41) is propped between two adjacent convex structures.

3. An axial flow fan provided with a hood as defined in claim 1, wherein: the motor shaft comprises a large-diameter section (32) and a small-diameter section (33) above the large-diameter section, a thread bush (43) is in threaded connection with the large-diameter section, and the fan blade (31) is arranged on the small-diameter section.

4. An axial flow fan provided with a hood as defined in claim 1, wherein: the wind barrel (20) is internally provided with a reinforcing rib (21), a bearing seat (22) is arranged on the reinforcing rib, and the top of the motor shaft is pivoted in the bearing seat.