CN110886708A

CN110886708A - Backward-inclined silent fan

Info

Publication number: CN110886708A
Application number: CN201911131170.2A
Authority: CN
Inventors: 刘菊香; 古俊锋
Original assignee: Kimberley Technology (shenzhen) Co Ltd
Current assignee: Kimberley Technology (shenzhen) Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-03-17

Abstract

The invention aims to provide a backward tilting type mute fan which comprises an upper volute, a lower volute, an impeller, a rotating shaft, an air guide ring, an air suction opening, an air outlet and a motor. The upper volute and the lower volute are provided with shallow bowl-shaped air guide rings, and the upper air guide rings are in a shape that the edges are parallel to the inner part and the bottom is inclined and is provided with an opening; the lower opening is connected with the rotating shaft of the motor. The wind guide blades are arranged in an inner bending mode, and one ends, close to the outer circle of the impeller, of the wind guide blades are provided with U-shaped openings for reducing wind pressure of exhaust wind. In addition, the inclination direction of the blades is clockwise, the rotation direction of the impeller is anticlockwise, and the wind power moves along the direction of the impeller to reduce the friction force, so that the noise can be reduced. The air outlet of the fan is in a horn shape with a narrow inner part and a wide outer part, the air outlet area can be increased, and the air pressure noise can be reduced through the large air outlet. By the method, the backward-inclined mute fan achieves the effects of negative pressure of wind power, strong wind power, low noise and smoother air outlet.

Description

Backward-inclined silent fan

Technical Field

The invention relates to a fan, in particular to a mute fan with stronger wind power, lower noise and smooth air outlet.

Background

The blower is a commonly used gas conveying machine, and is usually driven by a motor to drive an impeller connected with the blower to rotate so as to drive air to flow and form a forced airflow. An electric machine generally includes a stator and a rotor that rotates about the stator. The rotor is connected with the impeller so as to drive the impeller to rotate and further drive the airflow. In the existing fan on the market, the outer surface of the teeth of the stator is generally in an asymmetric structure, but the cogging torque of the motor is large, so that the torque fluctuation of the motor is caused, and the vibration and the noise are also large.

In the prior art, the fan basically adopts a mode that the blade inclination angle and the blade rotation direction are the same for ensuring large air suction volume, the structure of the fan blade is very simple, and the fan blade directly and positively resists friction with wind pressure.

Disclosure of Invention

The invention aims to provide a backward inclined silent fan which can form rotating wind, has strong negative pressure, stronger wind power, smaller noise and smoother wind outlet.

In order to achieve the above purpose, the solution of the invention is:

a fan comprises an upper volute, a lower volute, an impeller, a rotating shaft, an air guide ring, an air suction opening, an air outlet and a motor. The upper volute and the lower volute are provided with shallow bowl-shaped air guide rings, the air guide rings are in a shape of opening at the bottom with an inclined edge, and a large opening for air suction is formed in the center of the air guide ring connected with the upper volute and is an air suction opening; the central opening of the wind guide ring connected with the lower volute is small, and the lower opening is connected with the rotating shaft of the motor. The impeller is suspended in the shallow bowl-shaped air guide ring cavity; the upper side surface of the impeller is a circular ring with an opening in the same diameter, and the lower side surface of the impeller is a circular plate with a hole at the center.

The impeller is a circular ring and a row of air guide blades are clamped in two side faces of the circular plate. The impeller is provided with a plurality of inclined air guide blades, and an air outlet channel is formed by two adjacent air guide blades; the wind-guiding blade is the incurve shape of arranging, and every wind-guiding blade is isometric with the ring width with ring junction length, and wind-guiding blade and downside plectane junction length are longer than the side length of going up. The blade top end of the air guide blade in the air outlet direction is provided with a U-shaped opening for reducing the air pressure of the exhaust air quantity.

The wind guide blade is formed by arc-shaped pieces which extend inwards along the clockwise direction, the joint of the inner side walls of every two blades is an arc-shaped line, and the two arc-shaped lines are gaps which are narrow in the inner part and wide in the outer part.

The inclination direction of the air guide blades is opposite to the air outlet direction of the rotating wind formed by the impeller, the inclination direction of the blades is clockwise, the rotation direction of the impeller is anticlockwise, and the wind power moves along the direction of the impeller to reduce friction force and reduce noise.

The axial distance between the two end surfaces of the impeller and the air inlet and outlet is 3-5mm, and the radial distance between the circumference of the impeller and the volute is 15-20 mm.

The outer diameter length of the impeller is 200-250mm, and the inner diameter length of the upper side surface of the impeller is 120-170mm.

The distance between every two blades of the air guide blades of the impeller is 77.5-80mm along the outer edge of the peripheral direction of the impeller, and the inner distance along the central ring of the impeller is 35-36 mm.

The upper volute and the lower volute of the fan are two symmetrical casings, the upper volute and the lower volute are tightly buckled together at the crossed positions and are integrated, the buckled positions of the upper volute and the lower volute are fixed by screws, the impeller is arranged between the upper volute and the lower volute, the upper side ring of the impeller corresponds to the upper volute, and the lower side circular plate of the impeller corresponds to the lower volute.

Go up spiral case and spiral case extension down and be the air outlet, the air outlet presents the tubaeform of interior narrow outer width, can increase the air-out area, and big air outlet can reduce wind pressure noise abatement.

The motor sets up the outside of spiral case down, sets up the pivot in the middle of the motor, and the pivot passes spiral case inwards through the centre bore of impeller downside plectane down, and a side of pivot cylinder sets up the wedge screens, and there is the screw hole pivot top, and there is a connecting plate impeller downside and the centre of pivot being connected, and 6 screws of connecting plate expert are fixed on the impeller downside, and the connecting plate centre bore corresponds fixedly with pivot wedge screens. The motor is fixedly installed with the lower side surface of the impeller through a rotating shaft, and the rotating shaft drives the impeller to rotate in the rotating process.

The wind deflector is arranged above a wind guide ring of the upper volute of the fan, the wind deflector is suspended and fixed above the wind guide ring, the wind deflector is circular, 4 symmetric corners of the circular plate are provided with 4 notches, and the 4 notches are respectively provided with a right-angle fastener and a screw to fix the wind deflector on the wind guide ring. The air deflector changes the air suction direction, and sucks all the air around the side surface of the fan into the fan, not only the air in the front of the air suction opening, thereby increasing the air suction amount.

The invention produces the following beneficial results:

when the fan is used, the motor drives the impeller to rotate anticlockwise, external wind enters the fan from openings around the air deflector, and wind power diffuses from the center to the periphery and flows out from the air outlet position under the influence of wind pressure through gaps among the air guide blades of the impeller; the interval is constantly enlarged outwards from the impeller center between every two wind-guiding blades of this fan, lets wind form rotatory wind and form bigger negative pressure, reduces the frictional force between wind pressure and the blade when can increase the air output, and noise abatement produces.

Meanwhile, the impeller rotates anticlockwise to enable the wind guide blades to be not directly confronted with the wind, the friction force between the wind and the blades is reduced, and the noise generated by friction can be reduced. In addition, the air outlet adopts a trumpet-shaped flaring air outlet mode, the area of the air outlet is increased, the impact force of wind resistance on the shell is also reduced, the air outlet is smoother, stronger wind power is formed, and the noise of the fan can be reduced.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a side view of the present invention

Fig. 2 is a diagram of the internal impeller of the present invention.

Figure 3 is a schematic view of the lower volute of the present invention.

Figure 4 is a schematic view of the upper volute of the present invention.

Fig. 5 is a schematic view of the motor shaft and the connecting plate of the present invention.

Detailed Description

In order to further explain the scheme of the present invention, the present invention is explained in detail by the specific examples below.

As shown in fig. 1 to 5, the present invention provides a fan, which includes an upper volute (3), a lower volute (5), a motor (6), a rotating shaft (22), an upper side shallow bowl-shaped wind guide ring (19), a shallow bowl-shaped lower wind guide ring (16), a wind suction opening (20), a wind outlet (7), an impeller (8), wind guide blades (14), an impeller upper side circular ring (9), an impeller lower side circular plate (13), and a wind guide plate (1).

As shown in figure 1, a circular air deflector (1) is arranged above an air suction opening (20), a right-angle fastener (2) and a screw are fastened above the air suction opening (20) in the direction of 4 degrees, the air deflector (1) is used for changing the wind direction and the air suction area, the air suction direction is changed from right above to side air suction, and the air around the fan is mainly and quickly flowed and absorbed.

As shown in fig. 4, the upper volute casing (3) of the fan and the shallow bowl-shaped upper wind guiding ring (19) are connected into a whole, and a cavity body is arranged inside the shallow bowl-shaped upper wind guiding ring (19) and is used for attracting peripheral wind power. The edge position of the shallow bowl-shaped upper air guide ring (19) is tightly buckled with the panel of the upper volute (3) of the fan in parallel, the shallow bowl-shaped upper air guide ring (19) is fixed on the upper volute (3) by 8 screws (18), the inner part of the edge of the shallow bowl-shaped upper air guide ring (19) is in an inclined slope shape, the inclined plane is inwards in a vertical edge ring, and the functions of guiding the wind direction and gathering the wind are achieved.

As shown in figure 3, the lower volute casing (5) of the fan and the shallow bowl-shaped lower wind guide ring (16) are connected into a whole, the edge (17) of the lower wind guide ring and the lower volute casing (5) are fixed together by screws, the center of the lower wind guide ring (16) is provided with the motor (6), a rotating shaft (22) at the center of the motor (6) passes through the center hole of the lower wind guide ring (16), a wedge-shaped column (21) of the rotating shaft passes through a wedge-shaped hole (24) of the connecting plate (23) from the center hole to be fastened, the connecting plate (23) and the circular plate (13) at the lower side surface of the impeller are fixed together by 6 screws (11), the connecting plate (23) is fastened on the lower side surface (, the assembling method connects the motor (6), the rotating shaft (22), the connecting plate (23), the shallow bowl-shaped air guide ring (16) buckled in the lower volute (5), the impeller (8) and the circular plate (13) on the lower side surface of the impeller into an integrated structure.

Wherein, the rotating shaft (22) drives the connecting plate (23) to rotate in the rotating process, the connecting plate (23) is fixed with a circular plate (13) on the lower side surface of the impeller to drive the impeller (8) to rotate, and then the rotating shaft (22) passes through a central circular hole (not shown) of the lower volute (5) and the lower wind guide ring (16), and the rotating shaft (22) can not drive the lower volute (5) to rotate.

As shown in fig. 2 and 4, the impeller (8) is disposed inside a cavity between the upper volute (3) and the lower volute (5), the upper side surface (9) of the impeller (8) is a circular end surface, the lower side surface (13) of the impeller is a disc-shaped end surface, the upper side surface circular ring (9) of the impeller is over against the upper volute (3) and the upper volute wind guiding ring (19) of the fan, the lower side surface circular plate (13) of the impeller (8) is over against the lower volute (5) and the lower volute wind guiding ring (16) of the fan, and a central position formed by the upper side surface circular ring (9) of the impeller (8) and the upper volute wind guiding ring (19) is a cavity body for absorbing wind power and serving as a wind suction opening (20).

In the embodiment, the air guide blades (14) are arranged between the circular ring (9) on the upper side face of the impeller and the circular plate (13) on the lower side face of the impeller, each air guide blade (14) is formed into an arc shape which is bent clockwise, the arrangement shape of the air guide blades (14) is radiated outwards from the central ring of the circular plate (13) on the lower side face, wherein the inner distance (12) between every 2 air guide blades (14) is 35mm, the outer distance (not shown) between every 2 air guide blades (14) is 77.5mm, the impeller (8) adopts a counterclockwise rotation mode, the distance between the air guide blades (14) can ensure that large air pressure is outwards formed in the rotation process of the impeller (8), the counter force between wind power and the blades can be reduced, and therefore noise is reduced.

In this embodiment, the impeller (8) side ring (9) excircle diameter 230mm long, go up the long 150mm of circle diameter in side ring (9), go up the wide distance between side and the downside and be 61mm, inlet scoop (20) and induced draft the interior circle footpath scope of cavity all be about 150mm, induced draft the effect of wind power is gathered together to wind circle inclined plane (19) of cavity periphery, can guarantee that big amount of wind gets into the cavity function.

In the embodiment, a connecting plate is clamped between the lower volute (16) and a circular plate (13) on the lower side surface of the impeller (8), a motor bearing (22) penetrates through a center hole of an air guide ring on the lower volute (5), and then passes through a wedge-shaped hole (24) of the connecting plate (23), the connecting plate (23) and the impeller (8) are fixed into a whole through 6 screws (25), the wedge-shaped hole (24) and a wedge-shaped cylinder (21) of the bearing (22) form a clamping position, the bearing (22) rotates to drive the impeller (8) to rotate without influencing the stability of the lower volute (5), and the rotating shaft (22) rotates to drive the impeller (8) to rotate but does not drive the volute (5) to rotate.

In the embodiment, the axial distance between the upper volute (19) and the end face of the upper side ring (9) of the impeller (8) is 3-5mm, and the radial distance between the upper volute (19) and the outer circle edge of the impeller is 15-20 mm. The axial distance between the end faces of the lower volute (5) and the circular plate (13) on the lower side surface of the impeller (8) is 3-5mm, and the radial distance between the lower volute (5) and the outer circle edge of the impeller is 15-20 mm.

In this embodiment, the air guide vane (14) of impeller (8) is all the shape of arc bending, and each air guide vane (14) all sets up a U-shaped opening (15) along the one end of air-out direction, U-shaped opening (15) are used for dredging the wind pressure, have both alleviateed the weight of blade (14), reduce the area of contact of wind-force and blade simultaneously, reduce frictional force, let the noise that the fan produced reduce.

In the embodiment, the upper volute (3) and the lower volute (5) belong to a two-in-one symmetrical device, the edges of the upper volute (3) and the lower volute (5) are fastened by screws (4) to form an integral volute, and an impeller (8) is arranged in the inner space of the volute.

In this embodiment, air outlet (7) of fan set up to interior narrow outer wide horn shape, can increase the air-out area, alleviate air-out pressure, reduce the frictional force between wind and the fan shell, play the effect of noise reduction.

The above embodiments and drawings do not limit the form and style of the product of the present invention, and any suitable changes or modifications thereof by those skilled in the art may be made without departing from the scope of the present invention.

Claims

1. A backward-tilting silent fan comprises an upper volute, a lower volute, a rotating shaft, a motor, an impeller, an air guide ring, an air suction opening and an air outlet. The novel wind-guiding vane is characterized in that the fan is provided with an upper volute and a lower volute two-in-one symmetrical device, impellers are arranged in the space inside the upper volute and the lower volute, the upper side face of each impeller is a circular ring end face, the lower side face of each impeller is a circular plate end face, 12-16 arc wind-guiding vanes are arranged between the upper side face and the lower side face of each impeller, each wind-guiding vane radially extends from the center of each impeller to an outer circle, and each wind-guiding vane is provided with a U-shaped opening along one end of the outer circle of each impeller, wherein the width of each U-shaped opening is 12. The bending direction of the air guide blades is clockwise, the inclination angle is 40 degrees, the arc length of each air guide blade is 92-98mm, and the whole fan is made of aluminum alloy materials.

2. The backward-inclined mute fan as claimed in claim 1, wherein the outlet of the fan is formed in a horn shape with a narrow inside and a wide outside, and the outlet is made of aluminum alloy with a length of 160 mm and a width of 155 mm.

3. The backward-tilting mute fan as claimed in claim 2, wherein the upper volute of the fan is connected with the upper wind-guiding ring into a whole, the outer edge of the upper wind-guiding ring is attached to the end surface of the upper volute in parallel, and is fixedly connected by 6 screws; in addition, the outer edge of the upper air guiding ring is transited inwards to form an inclined plane, the inclined angle is 120 degrees, the inclined plane is transited inwards to form a vertical plane, the vertical plane and the outer edge form a vertical angle, and the upper air guiding ring is in a bowl shape. The inside of the vertical surface of the wind guide ring is a cavity body, and the cavity body and the inclined surface form an air suction opening together.

4. The backward inclined silent fan according to claim 3, wherein the lower volute is integrally connected with the lower wind guiding ring, the outer edge of the lower wind guiding ring is parallel to the end surface of the lower volute and is fixed together by screws, the outer edge is inwardly transited to form an inclined plane with an inclination angle of 120 °, the inclined plane is inwardly extended to be an end surface parallel to the outer edge, the lower wind guiding ring is integrally in a bowl shape, a circular aperture is arranged at the center of the bowl-shaped lower wind guiding ring, and the diameter of the aperture is 25-27mm and is 1mm larger than the diameter of the motor rotating shaft.

5. The backward-tilting silent fan according to claim 4, wherein a motor shaft of the fan is integrally connected to the lower volute, the lower wind-guiding ring and the circular plate of the lower side of the impeller, the fan shaft passes through the circular hole at the center of the lower volute and the lower wind-guiding ring and then passes through the connecting plate between the lower wind-guiding ring and the lower end of the impeller, wherein the hole at the center of the connecting plate is a wedge-shaped hole, the end of the motor shaft is also a wedge-shaped cylinder, the shaft passes through the wedge-shaped hole of the connecting plate to form a wedge-shaped clamp, and meanwhile, the connecting plate and the impeller are fixed by 6 screws to form an integrated structure through the screw holes at the periphery of the central hole of the connecting plate. The rotating shaft and the impeller form a structure rotating at the same speed, the rotating shaft freely rotates in the center hole of the lower volute, and the rotating shaft does not drive the volute to rotate.

6. The backward inclined silent fan as claimed in claim 5, wherein a wind deflector is disposed above the wind guiding ring of the volute on the fan, the wind deflector is suspended and fixed above the wind guiding ring, the wind deflector is circular, 4 notches are disposed at 4 symmetrical angles of the circular plate, and right-angled fasteners and screws are disposed at the 4 notches respectively to fix the wind deflector on the wind guiding ring.