CN113464477A

CN113464477A - Axial flow fan with hood

Info

Publication number: CN113464477A
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: 2021-10-01
Anticipated expiration: 2041-08-17
Also published as: CN113464477B

Abstract

The invention relates to an axial flow fan with a hood, which comprises the 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 abuts against the outer end of a cross rod, the inner end of the cross rod abuts against the motor shaft, and a spring is matched and sleeved on the pin. Under normal conditions, the hood is connected on the dryer, plays the effect of rain-proof ventilation. When a fire alarm occurs, the motor drives the fan blades, the motor shaft is separated from the cross rod, the cross rod is separated from the pins, and the pins are separated from the blast cap and the air duct under the action of the spring. The rotating fan blades drive the wind cap to separate from the wind barrel. Therefore, the wind cap does not block the wind barrel any more, and indoor smoke is discharged upwards in a straight line by airflow generated by the fan blades, so that 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 used for fire fighting and smoke discharging. For rain-proof, the upper side of the axial flow fan is provided with a hood, and the indoor and outdoor air can circulate through an air passage beside the hood. However, when a fire alarm occurs, the hood prevents the air flow generated by the fan from being discharged upwards, which causes the following disadvantages: firstly, airflow generated by the fan impacts on the blast cap and possibly flows back into the wind barrel to form backward flow; secondly, the air flow generated by the fan can be discharged outside through the air outlet structure beside the hood, the path of the air flow discharged outside is circuitous, the path of the air flow discharged outside 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 with the hood capable of automatically separating during fire alarm is provided.

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 joint, 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 cover has the spring on the pin, and the spring makes the pin have and breaks away from hood and dryer and to the trend of dryer central migration.

Under normal conditions, the hood is connected on the dryer, plays the effect of rain-proof ventilation. When a fire disaster happens, the motor starts to act, and the rotating motor shaft enables the cross rod to be inclined and then to be separated from the inner end of the cross rod while driving the fan blades, so that the outer end of the cross rod is separated from the pin, the pin is ejected towards the center direction of the air duct under the action of the spring, and the pin is separated from the air cap and the air duct. The rotating fan blades drive airflow in the air duct to rise linearly, and the airflow drives the air cap to rise and separate from the air duct. Therefore, the wind cap does not block the wind barrel any more, and indoor smoke is discharged upwards in a straight line by airflow generated by the fan blades.

The roof fan for fire fighting adopts the traditional hood for water prevention, and utilizes the motor which should rotate to separate the hood from the connection of the wind barrel during fire, so that the airflow of the fan can quickly discharge smoke.

Drawings

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

FIG. 1 is a schematic view of an axial flow fan provided 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 where the threaded sleeve 43 abuts against the crossbar 41.

The symbols in the drawings illustrate that:

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 threaded sleeve; 430. a convex structure;

50. an air shaft.

Detailed Description

With reference 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 mounted 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, a spring 42 is sleeved on the pin in a matching manner, and the spring enables the pin to have a tendency of moving towards the center of the air duct away from the hood and the air duct.

The bottom of dryer 10 is equipped with base 24, and the pedestal mounting is on the air shaft 50 on roof, and the dryer is penetrating from top to bottom, is vertical form. The motor 30 is connected with the inner side wall of the wind barrel through a connecting rod 23. The motor is connected with the main control board, and the main control board is connected domestic power, and the probe is felt to the cigarette and is connected with the main control board electricity, and the probe is felt to the cigarette can be installed indoor, also can install on the dryer, and when it sensed smog, to the main control board signal transmission, the main control board control motor was rotatory.

Under normal conditions, the hood 10 is connected to the wind pipe 20 to play a role of rain-proof ventilation. The spring 42 is in a compressed state. When a fire alarm occurs, the motor 30 starts to act, the rotating motor shaft enables the cross rod 41 to be inclined and then to be separated from the inner end of the cross rod while driving the fan blades 31, so that the outer end of the cross rod is separated from the pin 40, the pin is ejected towards the center direction of the air duct 20 under the action of the spring 42, and the pin is separated from the air cap 10 and the air duct 20, so that the air cap and the air duct are in a separated state. The rotating fan blades 31 drive the air flow in the air duct to rise linearly, and the air flow drives the air cap to rise and separate from the air duct. Therefore, the wind cap does not block the wind barrel any more, and indoor smoke is discharged upwards in a straight line by airflow generated by the fan blades.

Preferably, the hood 10 is made of light plastic, and after being disconnected from the air duct 20, the hood is driven by the fan blades 31 to easily rise along the air duct and be completely separated from the air duct.

Alternatively, the number of pins 40 is several, evenly distributed along the circumference of the hood 10, and correspondingly, the number of cross bars 41 is the same as the number of pins. The inner ends of all the cross rods are pressed on the motor shaft. Alternatively, the number of pins is two, spaced 180 degrees apart, and correspondingly, the number of cross bars 41 is two.

As an improvement, the inner end of the cross bar 41 abuts against the motor shaft through 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 low, the motor may not be able to drive the motor shaft to rotate against the force of the cross bar against the motor shaft. After the threaded sleeve 43 is arranged between the cross rod and the motor shaft, the situation that the motor cannot overcome the acting force of the cross rod 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 rod to the threaded sleeve makes the threaded sleeve not rotate along with the motor shaft because the cross rod 41 is pressed against the threaded sleeve 43, so that the motor shaft drives the threaded sleeve to ascend or descend until the threaded sleeve is separated from the cross rod. Thus, when the motor 30 is operated, the cross bar 41 can passively release the constraint of the pin 40, so that the pin can release the connection between the hood 10 and the wind cone 20.

Be equipped with first pinhole on the hood 10, be equipped with the second pinhole on the dryer 20, the pin 40 passes second pinhole and first pinhole by the interior outside to the dryer direction, and the one end of spring 42 supports and presses on the dryer inside wall, and the other end of spring supports and presses on pin afterbody edge 401, and the outer end and the pin afterbody of horizontal pole offset.

With reference 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. Under normal conditions, the motor 30 does not act, and due to the existence of the convex structure, the contact between the inner end of the cross rod and the threaded sleeve 43 is stable, and the cross rod cannot be separated from the threaded sleeve. Furthermore, the pin 40 is stably limited by the cross bar, and the wind cap 10 is stably connected with the wind cone 20.

As shown in fig. 1, the motor shaft includes a large diameter section 32 and a small diameter section 33 located above the large diameter section, a thread bushing 43 is screwed on the large diameter section, and the fan blade 31 is installed on the small diameter section. Namely, the threaded sleeve and the cross rod 41 are both positioned below the fan blade 31, and after the cross rod 41 is separated from the threaded sleeve 43 and the pin 40 is separated from the hood 10 and the air duct 20, the falling cross rod, pin and spring do not hinder 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 the motor shaft is pivoted in the bearing seat. In this way, the position of the motor shaft is stable, especially in the case where the motor shaft is subjected to radial forces by several cross bars 41 in different directions.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description herein, since various changes and modifications can be made in the details of the embodiment and the application range according to the spirit of the present 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 abuts against the outer end of a cross rod (41), the inner end of the cross rod abuts against a motor shaft, a spring (42) is matched and sleeved on the pin, and the spring enables the pin to have the tendency of moving towards the center of the air duct away from the hood and the air duct.

2. The axial flow fan provided with a cowl as claimed in claim 1, wherein: the inner end of the cross rod (41) is pressed against the motor shaft through a threaded sleeve (43), and the threaded sleeve is screwed on the motor shaft.

3. The axial flow fan provided with a cowl as claimed in claim 1, wherein: be equipped with first pinhole on hood (10), be equipped with the second pinhole on dryer (20), second pinhole and first pinhole are passed by the interior outside direction of dryer to dryer in pin (40), and the one end of spring (42) supports and presses on the dryer inside wall, and the other end of spring supports and presses on pin afterbody edge (401), and the outer end and the pin afterbody of horizontal pole support.

4. The axial flow fan provided with a cowl as claimed in claim 2, wherein: the outer side wall of the threaded sleeve (43) is provided with a convex structure (430), and the inner end of the cross rod (41) is pressed between two adjacent convex structures.

5. The axial flow fan provided with a cowl as claimed in claim 2, wherein: the motor shaft includes major diameter section (32) and is located major diameter section top minor diameter section (33), and thread bush (43) spiro union is on major diameter section, and fan blade (31) are installed on minor diameter section.

6. The axial flow fan provided with a cowl as claimed in claim 1, wherein: 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 the motor shaft is pivoted in the bearing seat.