JPS58217799A - Axial-flow fan - Google Patents

Abstract

PURPOSE:To enable to feed air in two directions by a single fan, by forming a suction port at the middle part of the outer circumference of a sleeve-like casing surrounding two axial-flow vane wheels which are fixed to the opposite ends of a turning shaft to face in opposite directions to each other, and discharging air drawn from the suction port axially in two directions in a divided manner. CONSTITUTION:Two axial-flow vane wheels 1, 2 disposed to face in opposite directions to each other are fixed to the opposite ends of a turning shaft 3a which is projected outwards from a driving motor 3, and they are surrounded by sleeve-like casing 4. The casing 4 is constituted by disposing outer sleeves 9, 10 with a proper spacing from each other so that a suction port 11 is formed at the middle part of the outer circumference of the casing 4. Air drawn from the suction port 11 along with operation of the motor 3 is discharged axially in two directions in a divided manner, as shown by arrows in the drawing, by the guide of guide vanes 7, 8 and an annular partition plate 6 disposed at the middle portion of the outer circumference of an inner casing 5 to which the motor 3 is fixed. With such an arrangement, it is enabled to feed air in two directions by a single fan with no use of branch ducts and to reduce the draft loss since the air flow is branched at the suction side where the pressure is low.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device capable of blowing air in two directions using one axial flow blower.

When blowing air in two directions with a single axial blower, a T-shaped branch tact was generally attached to the blower's exhaust port, but this structure required an increased number of parts for the duct, making it expensive. Moreover, installation requires space, and since the duct is installed on the high-pressure exhaust side, there is a drawback that ventilation loss increases.

In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide an axial flow blower that can blow air in two directions without using a branch duct.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an axial flow blower according to the present invention.

In the blower shown in this figure, two axial-flow type impellers 1.2 of opposite hands are fixed to both ends of a rotating shaft 8a protruding from a drive motor 3, and these are surrounded by a cylindrical casing 4. The casing 4 includes an inner shell 5 to which an electric motor 8 is fixedly attached, an annular partition plate 6 provided on the outer periphery of the central part of the inner shell 5, and radially arranged sections on the outer periphery of the inner shell 5 on both sides of the partition plate 6. A plurality of mutually opposite guide vanes 7.8,
A pair of outer cylinders 9.1o are arranged at the outer peripheral end of the guide vane 7.8 at a distance from each other and are fixed to each other by welding or the like. This casing 4 has an intake port 11 formed on the outer periphery of the central portion by arranging the outer cylinders 9 and 10 at intervals.
The air sucked in is guided by the partition plate 6 and the guide vanes 7.8, and is discharged after being branched into two directions in the axial direction as shown by the arrows.

According to the above-mentioned embodiment, not only is a branch duct unnecessary, but also the branch is made on the intake side where the pressure is low, so that ventilation loss can be reduced.

In FIGS. 2 and 3 showing other embodiments, the fourth
The electric motor 23 with mounting legs shown in FIGS. and 5 is used,
The mounting leg 23 a of the electric motor 23 extends through the intake port 21 to the outside of the casing 24 .

A plurality of support plates 27 and 28 serving as guide vanes are arranged radially on both ends of the outer periphery of the electric motor 23, and the casing 24 is spaced apart from each other on the outer periphery of the support plates 27 and 28. It is composed of only a pair of outer cylinders 29 and 30.

According to this embodiment, the entire blower can be supported by the mounting legs 2; 3a of the electric motor 23, and there is no need to increase the mechanical strength of the casing 24, so the casing 24 can be easily removed using only the outer cylinder 29, 30. As described above, according to the present invention, in a trickle blower, two impellers of opposite positions are attached to both ends of a rotating shaft protruding from a drive motor, and these impellers are An intake port is provided on the outer periphery of the central part of the enclosing cylindrical casing, and the air taken in from this intake port is branched into two directions in the axial direction and discharged, so a single unit can be used without using a branch duct. The effect is that air can be blown in two directions and that ventilation loss caused by branching can be reduced.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an axial blower according to the present invention, FIG. 2 is a partial vertical cross-sectional view showing another embodiment according to the present invention,
8 is a side view of FIG. 2, FIG. 4 is a front view of the electric motor of FIG. 2, and FIG. 5 is a side view of FIG. 4. 1.2... Impeller, 8.23... Electric motor, 8a...
・Rotating shaft, 4.24...Casing, 11.21...
・Intake port, 23a...Mounting leg. Representative Patent Attorney Izumi Yamaguchi Figure 4 Figure 5

Claims (1)

[Claims] ■) Two opposite-handed axial flow type impellers are fixed to both ends of a rotating shaft protruding from a drive motor, and an intake port is provided on the outer periphery of the central part of a cylindrical casing that surrounds them, An axial flow blower characterized in that the air taken in through the intake port is branched into two directions in the axial direction and discharged. 2. In the axial blower according to claim 1,
An axial flow blower characterized by extending the mounting legs of the electric motor to the outside of the casing.