CN218760491U - High-efficient multi-blade centrifugal fan - Google Patents

Abstract

The utility model discloses a high-efficient many leaf centrifugal fans, which comprises a housing, the both sides of casing are provided with air intake and driving motor respectively, the internally mounted of casing has many leaf wheels, many leaf wheels with driving motor's axle extension end is connected, the casing is provided with the air outlet, the air outlet angle sets up to 7 ~ 10. The utility model discloses a rational design realizes leafy centrifugal fan's high efficiency requirement. The utility model has the advantages of simple integral structure, installation convenient operation can increase substantially leafy centrifugal fan's efficiency.

Description

High-efficient multi-blade centrifugal fan

Technical Field

The utility model relates to a ventilation equipment technical field, more specifically relate to a high-efficient leafy centrifugal fan.

Background

The efficiency of the existing multi-blade centrifugal ventilator is generally about 50%, the efficiency is low, the economical efficiency is not high, and the higher and higher energy efficiency requirements of the existing fan cannot be met; however, because the pressure coefficient of the multi-blade centrifugal ventilator is high, the performance requirement can be met on the smaller size requirement, and therefore the multi-blade centrifugal ventilator is still widely used in certain specific occasions.

SUMMERY OF THE UTILITY MODEL

The not enough to prior art, the utility model provides a high-efficient leafy centrifugal fan can improve leafy centrifugal fan's efficiency.

In order to achieve the above purpose, the utility model provides a following technical scheme: a high-efficiency multi-blade centrifugal ventilator comprises a casing, wherein an air inlet and a driving motor are respectively arranged on two sides of the casing, a multi-blade wheel is installed inside the casing and connected with a shaft extension end of the driving motor, an air outlet is formed in the casing, and the angle of the air outlet is set to be 7-10 degrees.

Furthermore, the width of the casing is 0.7 times of the diameter of the impeller, and the fillet of the volute tongue of the casing is 0.05-0.1 times of the diameter of the impeller.

Furthermore, the inlet angle of the multi-blade wheel is set between 55 degrees and 80 degrees, the outlet angle is set between 150 degrees and 165 degrees, the blade angle is designed between 24 degrees and 30 degrees, the bending angle is designed between 70 degrees and 90 degrees, the tolerance of the inlet and outlet angles of the blades is +/-2 degrees, and the number of the blades is set between 24 and 44; the height of the blades is set to be between 0.3 and 0.5 times of the diameter of the impeller.

Further, two ends of each blade of the multi-impeller are designed into boss types.

Furthermore, the air inlet is designed to be conical, and the angle is 25-30 degrees.

Furthermore, the clearance between the volute tongue of the casing and the impeller is 0.1-0.12 times of the diameter of the impeller.

Furthermore, the axial clearance between the air inlet and the multi-impeller is between 3mm and 5 mm.

Furthermore, the driving motor is fixed on one side of the casing through a connecting plate, and sealing gaskets are arranged at the joint between the air inlet and the casing, the joint between the connecting plate and the casing and the joint between the driving motor and the connecting plate.

Through CFD analysis, experimental study and optimization, the utility model discloses discover following characteristic structure and the parameter range that is relevant with the fan performance:

1. expanding air outlet: in a certain angle range, the expansion type outlet is beneficial to improving the static pressure and the efficiency of the fan;

2. width of the case: the width of the housing affects the movement and velocity of the gas in the flow channel within the housing, thereby causing the flow loss of the gas stream to vary. When the width of the casing is too large, although the friction loss is reduced due to the reduction of the movement speed, a vortex area may be formed due to the sudden expansion of the gas after the gas enters the casing, so that the local flow loss is caused; when the width of the machine shell is too small, the air flow speed is increased, so that the friction loss is increased;

3. volute tongue structure: the change of the fillet radius of the volute tongue of the casing has little change on the performance of the fan, but has certain influence on the efficiency; meanwhile, when the gap between the volute tongue and the impeller becomes smaller, the efficiency of the fan can be improved, but the noise also becomes larger.

4. The blade structure is as follows: selecting reasonable impeller design parameters such as an inlet angle, an outlet angle, a blade bending angle, the number of blades, the height of the blades and the like; the reasonable design of the inlet angle, the outlet angle and the blade bending angle can reduce the generation of a volute area in a blade flow channel, thereby improving the efficiency of the fan; the increase of the height of the blades can improve a certain flow coefficient, but the overhigh height can generate vortex at the front disk of the impeller, so that the efficiency of the fan is reduced; an increase in the number of vanes increases frictional losses in the impeller channels, thereby reducing efficiency.

5. Axial clearance: the axial clearance between the air inlet and the multi-impeller can generate air flow leakage, so that the process conditions can be integrated, and the clearance can be reduced as much as possible to improve the efficiency.

By combining the analysis optimization and the experience in the product production test process, the highest efficiency of the multi-blade centrifugal fan can reach 70 percent through the measures.

To sum up, the utility model discloses a rational design realizes the high efficiency requirement of many impeller centrifugal fan. The utility model has the advantages of simple integral structure, installation convenient operation can improve leafy centrifugal fan's efficiency

Drawings

Fig. 1 is a schematic view (front view) of the overall structure of the present invention;

fig. 2 is a schematic view (side view) of the overall structure of the present invention;

FIG. 3 is an enlarged view of a part of the structure of the present invention;

fig. 4 is a schematic view (front view) of the housing of the present invention;

fig. 5 is a schematic view (side view) of the housing of the present invention;

FIG. 6 is a schematic structural view (front view) of the multi-impeller of the present invention;

fig. 7 is a schematic structural view (side view) of the multi-impeller of the present invention;

fig. 8 and 9 are schematic structural views of the middle blade of the present invention.

Description of the labeling: 1. a housing; 1.1, snail tongue; 2. an air inlet; 3. a multi-impeller; 3.1, a front disc; 3.2, a rear disc; 3.3, blades; 4. A connecting plate; 5. a gasket; 6. the motor is driven.

Detailed Description

An embodiment of a high-efficiency multi-blade centrifugal fan according to the present invention will be further described with reference to fig. 1 to 9.

A high-efficiency multi-blade centrifugal ventilator comprises a casing 1, wherein an air inlet 2 and a driving motor 6 are respectively arranged on two sides of the casing 1, a multi-blade wheel 3 is installed inside the casing 1, the multi-blade wheel 3 is connected with a shaft extension end of the driving motor 6, an air outlet is formed in the casing 1, and the angle of the air outlet is set to be 7-10 degrees.

The driving motor 1 is connected to the mounting plate 4 through a bolt, the multi-impeller 3 is fixed at the shaft extension end of the driving motor 6 through a bolt, the mounting plate 4 is connected to one side of the casing 1 through a bolt, and the air inlet 2 is connected to the other side of the casing 1 through a bolt; and a sealing gasket 5 is respectively added at the joint between the air inlet 2 and the machine shell 1, the joint between the connecting plate 4 and the machine shell 1 and the joint between the driving motor 6 and the connecting plate 4.

In this embodiment, preferably, the arc line of the casing 1 is designed according to fig. 2, and laser blanking is performed to ensure that the arc line of the casing is consistent with the design; the air outlet angle theta of the machine shell is between 7 and 10 degrees; the housing width K is designed at 0.7 x d; the fillet R of the volute tongue 1.1 is between (0.05 and 0.1) × D (D is the diameter (mm) of the impeller).

Preferably, the inlet angle beta of the multi-impeller 3 is _1A Designed between 55 degrees and 80 degrees, and has an outlet angle beta _2A The design is between 150 degrees and 165 degrees, the blade angle gamma is designed to be between 24 degrees and 30 degrees, the bending angle delta is designed to be between 70 degrees and 90 degrees, and the tolerance of the inlet and outlet angles of the blades 3.3 is between +/-2 degrees; the number of the blades 3.3 is designed to be between 24 and 44; the height h of the blade 3.3 is designed to be between (0.3 and 0.5) × D (D is the impeller diameter (mm)).

In this embodiment, preferably, the front disk 3.1 and the rear disk 3.2 of the multi-impeller 3 are blanked by laser, and the front disk 3.1 and the rear disk 3.2 are grooved according to the drawing requirements, and both ends of the blade 3.3 are designed into boss type, so as to ensure that the inlet and outlet angles of the blade are within the design error range.

In this embodiment, preferably, the air inlet 2 is designed to be tapered, the angle is between 25 ° and 30 °, and a connecting flange is disposed on the air inlet 2.

In the present embodiment, the gap t between the volute tongue of the casing 1 and the impeller 3 is preferably (0.1-0.12) × D (D is the diameter (mm) of the impeller).

In the present embodiment, the axial gap t1 between the inlet 2 and the multi-impeller 3 is preferably ensured to be between 3mm and 5 mm.

By the measures, the highest efficiency of the multi-blade centrifugal fan can reach 70%.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A high-efficient multi-blade centrifugal fan which characterized in that: the air conditioner comprises a shell, wherein an air inlet and a driving motor are respectively arranged on two sides of the shell, a multi-impeller is arranged in the shell and connected with a shaft extension end of the driving motor, an air outlet is formed in the shell, and the angle of the air outlet is set to be 7-10 degrees.

2. A high-efficiency multi-vane centrifugal fan according to claim 1, wherein: the width of the casing is 0.7 times of the diameter of the impeller, and the fillet of the volute tongue of the casing is 0.05-0.1 times of the diameter of the impeller.

3. A high-efficiency multi-vane centrifugal fan according to claim 1, wherein: the inlet angle of the multi-blade wheel is set between 55 degrees and 80 degrees, the outlet angle is set between 150 degrees and 165 degrees, the blade angle is designed between 24 degrees and 30 degrees, the bending angle is designed between 70 degrees and 90 degrees, the tolerance of the inlet and outlet angles of the blades is +/-2 degrees, and the number of the blades is set between 24 and 44; the height of the blades is set to be between 0.3 and 0.5 times the diameter of the impeller.

4. A high-efficiency multi-vane centrifugal fan according to claim 3, wherein: the two ends of the blades of the multi-blade wheel are designed into lug bosses.

5. A high-efficiency multi-vane centrifugal fan according to claim 1, wherein: the air inlet is designed to be conical, and the angle is 25-30 degrees.

6. A high-efficiency multi-vane centrifugal fan according to claim 1, wherein: the clearance between the volute tongue of the casing and the impeller is 0.1-0.12 times of the diameter of the impeller.

7. A high-efficiency multi-vane centrifugal fan according to claim 1, wherein: the axial clearance between the air inlet and the multi-impeller is between 3mm and 5 mm.

8. A high-efficiency multi-vane centrifugal fan according to claim 1, wherein: the driving motor is fixed on one side of the casing through the connecting plate, and sealing gaskets are arranged at the connecting part between the air inlet and the casing, the connecting part between the connecting plate and the casing and the connecting part between the driving motor and the connecting plate.

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