Diagonal flow fan

Abstract

A diagonal flow fan includes an air duct, a motor, a fan wheel, a blade, an air guiding ring, and a wheel hub, the air guiding ring has one end connected to the air duct, and the blade and the wheel hub are located inside the fan wheel, the blade has one end connected to the wheel hub and another end connected to the fan wheel, wherein the motor is located inside the wheel hub and connected to the wheel hub, the air guiding ring has another end located at an inner side of the fan wheel, and a gap exists between the air guiding ring and the fan wheel.

1 . A diagonal flow fan, comprising an air duct, a motor, a fan wheel, a blade, an air guiding ring, and a wheel hub, the air guiding ring having one end connected to the air duct, and the blade and the wheel hub being located inside the fan wheel, the blade having one end connected to the wheel hub and another end connected to the fan wheel, wherein the motor is located inside the wheel hub and connected to the wheel hub, the air guiding ring has another end located at an inner side of the fan wheel, and a gap exists between the air guiding ring and the fan wheel. 
     
     
         2 . The diagonal flow fan according to  claim 1 , wherein the air guiding ring is in a trumpet shape, and the end of the air guiding ring that is connected to the air duct is flared outwards. 
     
     
         3 . The diagonal flow fan according to  claim 1 , wherein a size S of the gap is 0 mm<S≦10 mm. 
     
     
         4 . The diagonal flow fan according to  claim 1 , wherein a balancing component configured to maintain dynamic balance of the diagonal flow fan is fixedly mounted at an outer peripheral surface of the fan wheel. 
     
     
         5 . The diagonal flow fan according to  claim 4 , wherein the balancing component is a balance nail. 
     
     
         6 . The diagonal flow fan according to  claim 1 , wherein the blade and the wheel hub are formed as an integral structure. 
     
     
         7 . The diagonal flow fan according to  claim 1 , wherein a protrusion is provided on the blade, and the protrusion is fitted into a locking slot of the fan wheel, and the protrusion and the fan wheel are welded by ultrasonic welding process. 
     
     
         8 . The diagonal flow fan according to  claim 1 , wherein the motor is an outer rotor type motor, and an outer rotor shaft of the motor is inserted into a central hole of the wheel hub. 
     
     
         9 . The diagonal flow fan according to  claim 1 , further comprising a steel ring, wherein the steel ring is fixedly connected to the motor and the wheel hub respectively. 
     
     
         10 . The diagonal flow fan according to  claim 9 , wherein the steel ring is fixedly connected to the wheel hub by a screw, and the steel ring is fixedly connected to the motor by riveting and/or welding. 
     
     
         11 . The diagonal flow fan according to  claim 2 , wherein a balancing component configured to maintain dynamic balance of the diagonal flow fan is fixedly mounted at an outer peripheral surface of the fan wheel. 
     
     
         12 . The diagonal flow fan according to  claim 11 , wherein the balancing component is a balance nail. 
     
     
         13 . The diagonal flow fan according to  claim 3 , wherein a balancing component configured to maintain dynamic balance of the diagonal flow fan is fixedly mounted at an outer peripheral surface of the fan wheel. 
     
     
         14 . The diagonal flow fan according to  claim 13 , wherein the balancing component is a balance nail.