Large-air-volume volute fan

Abstract

The invention relates to a large-air-volume volute fan. The fan comprises a volute, a wind wheel and a motor, an air duct is formed in the volute, a coaming of the volute is in an open ring shape, anair outlet is formed in an opening of the coaming, the wind wheel is arranged in the air duct and is in transmission connection with the motor, and a first lead-out plate and a second lead-out plate are arranged on the two sides of the air outlet correspondingly; the second lead-out plate is connected with the other end of the opening of the coaming through an arc transition surface, the horizontal distance between a tangent point between the arc transition surface and a vertical line and the first lead-out plate is 125-155mm, and an included angle between the second lead-out plate and a vertical line is 20-70 degrees; a first arc plate, a second arc plate and a third arc plate are sequentially arranged between the corresponding arc transition surface of the coaming and the first lead-outplate in a tangent transition mode; and blades of the wind wheel are formed by connecting inner arc pieces and outer arc pieces in a tangent transition mode. According to the fan, the structures and sizes of the air outlet, the air duct and the wind wheel are optimized, so that the whole air outlet is reasonably and gradually increased from inside to outside, the exhaust air rate and the exhaust air pressure are increased, and exhausted air can be conveyed to a farther position.

Description

technical field [0001] The invention relates to a volute wind wheel, in particular to a volute fan with a large air volume. Background technique [0002] The current volute fan is widely used in range hood and other industries, which includes a volute, a wind wheel and a motor. The volute is surrounded by a front cover, a shroud and a rear end cover. The end covers are respectively arranged on the front and rear sides of the coaming. The coaming, the front end cover and the rear end cover together form an air duct. The rear air inlet is provided with a motor frame on the rear air inlet, the motor is arranged on the motor frame, and the wind wheel is arranged in the air duct and connected with the motor transmission. At present, the radius of the fan wheel for range hoods is generally 125mm to 155mm, and the left and right sides of the corresponding air outlet of the volute are parallel, so that the discharge control accumulates at the air outlet and cannot be discharged in ...

AI Technical Summary

Problems solved by technology

At present, the radius of the fan wheel for range hoods is generally 125mm to 155mm, and the left and right sides of the corresponding air outlet of the volute are parallel, so that the discharge control accumulates at the air outlet and cannot be discharged in time, which affects the air volume and reduces the air flow. Static pressure at the air inlet of the wheel, resulting in poor smoking effect

In order to overcome this problem, the air outlet of some products is set vertically upwards, so that the width of the end connecting the air outlet and the air duct is increased as much as possible. At this time, although the control in the air duct can be quickly discharged, but due to the The pressure is lower, so that the air flow rate at the air outlet is reduced

In addition, the coaming of the above structure is connected by two sections of circular arc plates corresponding to the two sides of the air outlet. Therefore, the involute between the inner surface of the coaming and the center of the wind wheel increases rapidly, so that The pressure of the air thrown by the wind wheel is insufficient during the process of pushing the air through the air duct to the air outlet, and the wind speed drops. Similarly, the air pressure of the external flue exhaust duct is likely to be greater than the air pressure blown by the fan. When the range hood is actually installed and applied, due to the exhaust The channel is long, because the exhaust pressure of the fan outlet is small, so that the outside air flows backward

[0003] In addition, the current wind wheel includes a hub, more than two support rings and some blades, some blades are uniformly distributed around the center of the hub, and are connected with the periphery of the hub, the two ends of the blades are respectively connected with the support ring, and the blades The cross-section is arc-shaped. Because it is a single arc, that is, the radians are the same everywhere, it cannot be that the outer circumference of the wind wheel forms a large wind pressure. Therefore, it also leads to the problem of weakened suction and small air output.

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