JPH1162898A - Mixed flow fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve boosting performance and reduce assembling man-hour by elongating main plate and side plate of an impeller by a prescribed length from the discharge side of a vane and making a rotary diffuser. SOLUTION: A rotary diffuser 20 is constituted by elongating each of a main plate 1 and a side plate 2 of an impeller F to the downstream side from a discharge side 3a of a vane 3 and obliquely by a prescribed length in the outside diameter direction. In this case, when the impeller F is driven by a motor 5 via a drive shaft 6, the speed component is converted into pressure in a process that air flows in the rotary diffuser 20 after air is sucked into the impeller F from the suction port 15 through an air passage 14 and air is energized by the vane 3 and subsequently air is blown out within a chamber 4. Because the speed component is converted into pressure in a process that gas flows in the rotary diffuser 20, pressure loss of the exit of the impeller F is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a mixed flow fan.

[0002]

2. Description of the Related Art An example of a conventional mixed flow fan is shown. F denotes an impeller, which is composed of a main plate 1, side plates 2, and a plurality of blades 3 provided therebetween. The impeller F is disposed in the chamber 4 and is driven by a motor 5 via a rotating shaft 6.

[0003] A diffuser 8 is provided near the discharge port 7 of the impeller F. This diffuser 8 has an outer ring 9
, An inner ring 10, and a plurality of short-span diffuser blades 11 provided between them, and are supported by a casing 13 via a plurality of support stays 12.

[0004] When the impeller F is driven by the motor 5 via the drive shaft 6, air that has cooled an object to be cooled such as a radiator (not shown) passes through the air passage 14 to the impeller F from its suction port 15. After being sucked and urged by the blades 3 and then discharged from the discharge port 7, the velocity component is converted into pressure by the diffuser blades 11 in the process of flowing through the diffuser 8 and is blown into the chamber 4. .

[0005]

In the above-mentioned conventional mixed flow fan, since the impeller F is installed in the chamber 4, the dynamic pressure at the discharge port 7 of the impeller F is all pressure loss.

In order to reduce the pressure loss, a diffuser 8 is installed in the vicinity of the discharge port 7 of the impeller F. There is a problem that the recovery is not sufficient, and the structure becomes complicated, the number of parts increases, and the cost increases.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above problems, and its gist is to provide a blade having a plurality of blades installed between a main plate and a side plate. In the mixed flow fan in which a car is installed in the chamber, a rotary diffuser is formed by extending a main plate and a side plate of the impeller from the discharge side of the blade by a predetermined length. is there.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIG. The main plate 1 and the side plate 2 of the impeller F are respectively
The rotary diffuser 20 is formed by extending a predetermined length obliquely in the outer diameter direction on the downstream side from the discharge side 3a.

The other structure is the same as the conventional structure shown in FIG. 2 except that the diffuser 8 is omitted. Corresponding members have the same reference characters allotted, and description thereof will not be repeated.

When the impeller F is driven by the motor 5 via the drive shaft 6, air is sucked into the impeller F through the air passage 14 from the suction port 15 and is urged by the impeller 3. Thereafter, the velocity component is converted into pressure in the course of flowing through the rotating diffuser 20, and then is blown into the chamber 4.

[0011]

According to the present invention, the rotary diffuser is constituted by extending the main plate and the side plate of the impeller from the discharge side of the blade by a predetermined length, so that the gas urged by the blade flows through the rotary diffuser. Since the speed component is converted into pressure in the process, the pressure loss at the impeller outlet is reduced, and therefore, the boosting performance of the mixed flow fan can be improved.

Further, since the rotary diffuser is constituted by extending the main plate and the side plate of the impeller, the structure is simple and the number of parts, machining and assembly steps can be reduced, so that the cost can be reduced. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a mixed flow fan showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional mixed flow fan.

[Explanation of symbols]

 F Impeller 1 Main plate 2 Side plate 3 Blade 3a Discharge side 15 Suction port 4 Chamber 5 Motor 6 Rotary shaft 13 Casing 14 Air flow path 20 Rotary diffuser

Claims (1)

[Claims] 1. An oblique flow fan having a plurality of blades installed between a main plate and a side plate in a chamber, the main plate and the side plate of the impeller being moved from the discharge side of the blades. A mixed flow fan characterized in that a rotary diffuser is formed by extending a predetermined length.