CN217401193U

CN217401193U - High-speed centrifugal fan

Info

Publication number: CN217401193U
Application number: CN202221213217.7U
Authority: CN
Inventors: 蔡成瑞
Original assignee: Zhejiang Bochuan Power Technology Co ltd
Current assignee: Zhejiang Bochuan Power Technology Co ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-09-09
Anticipated expiration: 2032-05-20

Abstract

The utility model relates to the field of centrifugal fans, and discloses a high-speed centrifugal fan, which comprises a volute and fan blades, wherein a plurality of guide air channels for guiding air are arranged on the fan blades, an outer wheel cover and an inner wheel disc are respectively arranged on the inner side and the outer side of each fan blade, an air inlet channel which is communicated with the inner wheel disc is arranged on the front side of the volute, a spiral air outlet channel is arranged on the peripheral side surface of the volute, and the air outlet channel is communicated with the guide air channels; the inner surface of the outer wheel cover is provided with a containing cavity, the bottom of the fan blade is provided with a reinforcing rib matched with the containing cavity, and the reinforcing rib is contained in the containing cavity and respectively keeps a gap with the cavity wall and the cavity bottom; the utility model discloses make and formed between strengthening rib and the foreign steamer lid and be close sealed structure, can hardly windy to reserve from between the clearance, and stay in the wind-guiding wind channel to the loss of the wind-force that has significantly reduced has practiced thrift the energy.

Description

High-speed centrifugal fan

Technical Field

The utility model relates to a centrifugal fan field especially relates to a high-speed centrifugal fan.

Background

The centrifugal fan converts mechanical energy of rotation of a fan impeller into pressure energy and kinetic energy of gas and conveys the gas out, the gas enters the air inlet along the axial direction of the air inlet, centrifugal force is generated by rotation of the fan blades, and the gas is output by airflow along an air outlet channel of the volute. Because the fan blades rotate, the outer wheel cover and the volute do not rotate, the bottom of the fan blades and the outer wheel cover cannot be fixed, and gaps between the fan blades and between the outer wheel cover can enable part of wind to be thrown out from the space between the fan blades at the bottom and the outer wheel cover, so that the wind leakage phenomenon exists, and the energy waste is caused.

Disclosure of Invention

The utility model discloses shortcoming to among the prior art provides a high-speed centrifugal fan.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve:

a high-speed centrifugal fan comprises a volute and a fan blade, wherein a plurality of guide air channels for guiding air are arranged on the fan blade, an outer wheel cover and an inner wheel disc are respectively arranged on the inner side and the outer side of the fan blade, an air inlet channel penetrating through the inner wheel disc is arranged on the front side of the volute, a spiral air outlet channel is arranged on the peripheral side surface of the volute, and the air outlet channel is communicated with the guide air channels; the internal surface that foreign steamer lid has is provided with and holds the chamber, and the bottom of fan blade is provided with and is used for holding chamber matched with strengthening rib, and the strengthening rib holding is holding the intracavity and leaving the clearance respectively at the bottom of chamber wall and the chamber. The air inlet of the air inlet channel is generally arranged in a horn shape with a large front side and a small rear side in the front side central skill channel of the volute, air can enter the air inlet channel along the axial direction of the air inlet and then uniformly enter each guide air channel along with the rotation of the fan blade, namely, the air outlet channel is communicated with the air inlet channel through each guide air channel of the fan blade. The fan blades change the axial flowing wind into radial wind, and the wind flows into the wind outlet channel at the side edge along the bottom of the guide wind channel, and the air can be thrown out to the outlet of the wind outlet channel along the spiral of the wind outlet channel.

Preferably, the volute is provided with an air inlet at one side of the air inlet channel, and the inner wall of the volute at the air inlet is provided with an arc shape expanding from inside to outside.

Preferably, the inner wall of the volute at the air inlet is provided with an arc shape in an elliptic arc shape. Compared with the prior art in which an inclined conical surface is adopted, the air inlet with the elliptical arc can reduce the resistance of air inlet and the airflow flowing resistance loss of the inflowing air, thereby obtaining better performance.

Preferably, the outer ring of the accommodating cavity is provided with a concave cavity, the bottom of the fan blade is provided with an inner ring of reinforcing ribs and an outer ring of reinforcing ribs, gaps are formed between the reinforcing ribs of the inner ring and the outer ring of the reinforcing ribs and the inner side cavity wall of the accommodating cavity and the outer side cavity wall of the accommodating cavity respectively, and the fan blade is accommodated in the concave cavity outside the reinforcing ribs of the outer ring of the fan blade and has gaps with the cavity walls of the concave cavity. The presence of the gap serves the purpose of the blade being in close proximity to the outer shroud but not in contact with the inner surface of the outer shroud.

Preferably, the width of the gap between the reinforcing rib of the inner ring and the inner side cavity wall of the accommodating cavity is s, the width of the gap between the reinforcing rib of the outer ring and the outer side cavity wall of the accommodating cavity is s, and s is more than or equal to 0.1mm and less than or equal to 0.9 mm. The clearance is very little, when a small amount of wind gets into the clearance between fan blade bottom and the outer wheel casing, because form a turning between strengthening rib and the outer wheel casing, if wind will flow out, totally pass through three turning, just also change the cubic direction and just can follow the clearance flow direction inboard clearance in the cavity outside the cavity, this makes and has formed between strengthening rib and the outer wheel casing and is close sealed structure, can hardly let out between the clearance by wind, and stay in the wind-guiding wind channel, thereby greatly reduced the loss of wind-force, the energy has been practiced thrift.

Preferably, a through hole is formed in the middle of the fan blade, an output shaft of the motor extends into the through hole to enable the fan blade to be in transmission connection with the output shaft, and a sealing cover used for sealing the through hole is arranged on the inner side of the fan blade. The fixing mode of the fan blade and the output shaft is that the fan blade and the output shaft of the motor are fixed by utilizing the principle of expansion with heat and contraction with cold, namely the fan blade and the output shaft of the motor are fixed in an interference fit mode. The sealing cover has the functions of preventing wind entering from the air inlet from passing through the through hole in the middle of the motor and preventing foreign impurities from entering to affect the operation of the motor.

Preferably, the inner diameter of the air outlet channel is gradually increased from inside to outside. When wind flows out, the wind speed is accelerated at the position with the smaller inner diameter of the wind outlet channel, and the spiral wind outlet channel can enable the wind to flow from the position with the smaller inner diameter to the position with the larger inner diameter and finally be thrown out from the outlet of the wind outlet channel.

Preferably, the guide air duct, the concave cavity outer side platform of the inner wheel disc and the inner side surface of the volute are sequentially connected to form a smooth curved surface. The design can ensure that the wind in the guide air channel enters the wind outlet channel of the volute along the curved surface, thereby reducing the loss of wind power. The smooth curved surface enables the whole air outlet to be smoother, the whole performance of the fan is improved, and a certain noise reduction effect is achieved.

The utility model discloses owing to adopted above technical scheme, have apparent technological effect: a structure close to sealing is formed between the reinforcing ribs and the outer wheel cover, and almost no wind is left between gaps and in the wind guide air duct, so that the loss of wind power is greatly reduced, and the energy is saved; the strength of the fan blade is further enhanced due to the fact that the strength of the bottom of the fan blade is increased; the elliptical arc with the taper is arranged at the air inlet of the volute, so that the resistance of air inlet can be reduced, more air can enter the volute from the air inlet to be thrown out by the air supply blades due to the larger opening angle, and the working efficiency of the fan is further improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an exploded view of the present invention.

Fig. 3 is a top view of the wind of the present invention.

Fig. 4 is a cross-sectional view a-a of fig. 3.

Fig. 5 is a partially enlarged view of B in fig. 4.

The names of the parts designated by the numerical references in the above figures are as follows: wherein, 1, a volute; 2. a fan blade; 21. reinforcing ribs; 22. a guide air duct; 3. an outer wheel cover; 31. an accommodating chamber; 32. a concave cavity; 4. an inner wheel disc; 41. an air inlet channel; 42. an air outlet channel; 43. an inner wall; 5. an output shaft; 51. and (7) sealing the cover.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Examples

A high-speed centrifugal fan, as shown in fig. 1-5, comprises a volute 1 and a fan blade 2, wherein the fan blade 2 is provided with a plurality of guide air channels 22 for guiding air, the inner side and the outer side of the fan blade 2 are respectively provided with an outer wheel cover 3 and an inner wheel disc 4, the front side of the volute 1 is provided with an air inlet channel 41 penetrating through the inner wheel disc 4, the peripheral side surface of the volute 1 is provided with a spiral air outlet channel 42, and the air outlet channel 42 is communicated with the guide air channels 22; the inner surface that outer wheel cover 3 has is provided with and holds chamber 31, and the bottom of fan blade 2 is provided with and is used for holding chamber 31 matched with strengthening rib 21, and strengthening rib 21 holds in holding chamber 31 and leaves the clearance respectively with between chamber wall and the chamber bottom.

The volute 1 is provided with an air inlet at one side of the air inlet channel 41, and the inner wall 43 of the volute 1 at the air inlet is provided with an arc shape expanding from inside to outside.

The inner wall 43 of the volute 1 at the air inlet is provided with an arc shape in an elliptic arc shape.

The outer lane that holds chamber 31 is equipped with cavity 32, and the bottom of fan blade 2 is equipped with two rings of strengthening ribs 21 inside and outside, and the strengthening rib 21 of inner circle and outer lane has the clearance respectively with the inboard chamber wall that holds chamber 31 and the outside chamber wall that holds chamber 31 between, fan blade 2 in the strengthening rib 21's of outer lane outside holding in cavity 32 and with cavity 32 between the chamber wall have the clearance.

The width of the gap between the reinforcing rib 21 of the inner ring and the inner side cavity wall of the accommodating cavity 31 is s, the width of the gap between the reinforcing rib 21 of the outer ring and the outer side cavity wall of the accommodating cavity 31 is s, and s is not less than 0.1mm and not more than 0.9 mm. Preferably s is 0.5 mm.

The middle of the fan blade 2 is provided with a through hole, an output shaft 5 of the motor extends into the through hole to enable the fan blade 2 to be in transmission connection with the output shaft 5, and the inner side of the fan blade 2 is provided with a sealing cover 51 for sealing the through hole.

The inner diameter of the air outlet passage 42 gradually increases from the inside to the outside.

The guide air duct, the platform at the outer side of the concave cavity 32 of the inner wheel disc 4 and the inner side surface of the volute 1 are sequentially connected to form a smooth curved surface.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In short, the above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the scope of the present invention.

Claims

1. A high-speed centrifugal fan comprises a volute (1) and fan blades (2), wherein a plurality of guide air channels (22) for guiding air are arranged on the fan blades (2), an outer wheel cover (3) and an inner wheel disc (4) are respectively arranged on the inner side and the outer side of each fan blade (2), an air inlet channel (41) penetrating through the inner wheel disc (4) is arranged on the front side of the volute (1), a spiral air outlet channel (42) is arranged on the peripheral side surface of the volute (1), and the air outlet channel (42) is communicated with the guide air channels (22); the method is characterized in that: the inner surface that outer wheel cap (3) had is provided with and holds chamber (31), and the bottom of fan blade (2) is provided with and is used for holding chamber (31) matched with strengthening rib (21), and strengthening rib (21) holding is in holding chamber (31) and respectively and leave the clearance at the bottom of chamber wall and the chamber.

2. The high-speed centrifugal fan according to claim 1, wherein: an air inlet is formed in one side, located on the air inlet channel (41), of the volute (1), and an arc shape expanding from inside to outside is formed in the inner wall (43) of the volute (1) at the air inlet.

3. The high-speed centrifugal fan according to claim 1, wherein: the inner wall (43) of the volute (1) at the air inlet is provided with an arc in an elliptic arc shape.

4. The high-speed centrifugal fan according to claim 1, wherein: the outer ring that holds chamber (31) is equipped with cavity (32), and the bottom of fan blade (2) is equipped with inside and outside two rings of strengthening rib (21), and the strengthening rib (21) of inner circle and outer ring respectively with hold the inboard chamber wall in chamber (31) and hold the outside chamber wall in chamber (31) between have the clearance, fan blade (2) outside holding of strengthening rib (21) in the outer ring have the clearance in cavity (32) and with the chamber wall of cavity (32) between.

5. The high-speed centrifugal fan according to claim 1, wherein: the width of the gap between the reinforcing ribs (21) of the inner ring and the inner side cavity wall of the accommodating cavity (31) is s, the width of the gap between the reinforcing ribs (21) of the outer ring and the outer side cavity wall of the accommodating cavity (31) is s, and s is more than or equal to 0.1mm and less than or equal to 0.9 mm.

6. The high-speed centrifugal fan according to claim 1, wherein: the middle of the fan blade (2) is provided with a through hole, an output shaft (5) of the motor extends into the through hole to enable the fan blade (2) to be in transmission connection with the output shaft (5), and the inner side of the fan blade (2) is provided with a sealing cover (51) used for sealing the through hole.

7. The high-speed centrifugal fan according to claim 1, wherein: the inner diameter of the air outlet channel (42) is gradually increased from inside to outside.

8. The high-speed centrifugal fan according to claim 1, wherein: the guide air duct, the platform at the outer side of the concave cavity (32) of the inner wheel disc (4) and the surface at the inner side of the volute (1) are sequentially connected to form a smooth curved surface.