JP2891579B2 - Axial blower air separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air separator for an axial blower, and more particularly to a structure of a radial vane type air separator which contributes to improving the stall of the axial blower.

[0002]

2. Description of the Related Art FIGS. 6 to 8 show an example of the structure of a conventional radial vane type air separator. In these figures, in a casing 2 covered on the outer periphery of a moving blade 1 of an axial fan, a portion of the casing 2 facing the leading end of the moving blade 1 is recessed from near the leading edge of the leading edge of the moving blade 1 toward the upstream side. A circulation channel 4 is formed by forming a place 3. The air flow velocity generated by the swirling motion of the moving blade 1 is located at a position closest to the tip of the first moving blade 1 inside the circulation flow path 4.
A large number of vanes 5 are arranged in parallel in the circumferential direction in order to remove the degree of swirling components . This eliminates the disadvantage that the pressure drops sharply at the stall point, and allows the degree of the stall margin to be estimated. In addition, in FIG.
Indicates a hub and 7 indicates a ring.

[0003]

However, in the above-described conventional air separator, the recess 3 is generally open toward the main flow portion of the blower, so that a part of the main flow A is indicated by an arrow B. As shown, there was a problem that it constantly leaked and circulated. For this reason, there has been a tendency that the efficiency of the blower other than near the stall point is reduced. And this efficiency loss could reach a few percent.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and is intended to prevent a decrease in efficiency in a sound operating region other than the stall point while maintaining the stall improvement. An object of the present invention is to provide an air separator for a blower.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an axial blower in which a casing covered on the outer periphery of a moving blade has a structure in which the moving blade of the casing portion facing the tip of the moving blade is disposed. In an air separator having a recess formed on the upstream side, a vane body is disposed in each of a plurality of openings formed in a circumferential direction of the casing, and one end of the vane body is supported by the casing. concatenates the other end of said vane member to the rotatable outer ring in the circumferential direction, before
Circumferential rotation of the outer ring near the stall point of the axial blower
Thereby, the vane body is closed so that the inner surface thereof substantially coincides with the inner surface of the casing in the circumferential direction.
From the state, the inner surface is opened to open the opening.
It is characterized by being constituted as follows.

[0006]

According to the above-mentioned means, when the blower is operating at a position distant from the stall region, the opening of the casing serving as the inlet of the air separator is closed by the vane body, and the inner surface of the vane body is moved to the inner surface of the casing. by Ru substantially coincide, the circulating flow within the air separator is eliminated. Therefore, the power for generating the circulating flow is not lost, so that a high efficiency operation of a normal blower is achieved. On the other hand, when approaching the stall area, the outer ring is rotated in the circumferential direction to raise the vane body,
By forming the air separator channel by opening the opening of the casing, it is possible to exhibit the stall improvement effect.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of a main part showing an air separator of an axial blower according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a perspective view of a vane body according to this embodiment. FIG.

In these figures, a casing 13 is covered on the outer periphery of a moving blade 12 attached around a hub 11, and a casing 1 opposed to the tip of the moving blade 12 is provided.
A recess 14 is formed on the upstream side from the rotor blade 12 of the portion 3. As shown in detail in FIG. 2, the casing 13 is divided into a number of small segments in the circumferential direction.
A space is formed in each small segment , and in each space, two flat plate-like vane first elements 15 and vane second elements 16 as shown in detail in FIG. A vane body 17 having a configuration that can be worn and bent is provided.

The one end of the vane body 17, that is, the free end of the first vane element 15 is connected to the first vane element 1
The inner surface of the casing 5 is supported via an axially extending pin 18 (which is suspended between the casing 13 and the air separator ring 19) so that the inner surface of the casing 5 substantially coincides with the inner surface of the casing 13 in the circumferential direction. The other end of the vane body 17, that is, the free end of the second vane element 16 is connected to an outer ring 20 rotatable in the circumferential direction via a pin 21 extending in the axial direction.

On the other hand, the recess 14 is formed by a casing 13 and an air separator channel wall 23 on the upstream side of the rotor blade 12, and an air separator ring 19 having the same radius as the casing 13 is provided in the recess 14. The air separator ring 19 is disposed above and downstream of the air separator ring 19 so as to secure a flow path. The outer ring 20 is rotatably provided in the recess 14 and has a gear 24 attached to a part of the outer ring 20 so that the gear 24 projects outside from the opening 23A of the air separator channel wall 23. It is configured as follows. A motor 25 is disposed outside the air separator channel wall 23, and a pinion 27 that meshes with the gear 24 via a shaft 26 is attached.

Further, as shown in detail in FIG. 3, the vane body 17 includes a vane first element 15 and a vane second element
The element 16 is hinged by a pin 22, and the other ends of the first vane element 15 and the second vane element 16 are rotatably attached to the pins 18 and 21, respectively.

Next, the operation of this embodiment will be described.
In FIG. 2, in the normal case where the blower is operating away from the stall zone, the vane first element 15 and the vane
The vane body 17 constituted by the element 16 and the vane body 17 is set to the posture shown by the solid line, and the inner surface of the vane first element 15 substantially coincides with the inner surface of the casing 13 in the circumferential direction to form the same circumferential surface as a whole. Thus, the opening of the casing 13 serving as the inlet of the air separator is closed. This is outer ring 2
This is achieved by setting the zero position to an appropriate position. As a result, there is no decrease in blower performance when sound.

On the other hand, when approaching the stall point, an instruction is given to the motor 25 from outside or automatically, and the outer ring 20 is rotated in the circumferential direction. As a result, the position and shape of the vane body 17 are changed as shown by a two-dot chain line in FIG. Thereby, the opening of the casing 13 is opened and forms an angle with the circumferential direction. Therefore, a part of the flow on the tip side of the blower is scooped up, the circulating flow passes through the air separator flow path as shown by the arrow C in FIG. 1, is rectified in the axial direction, and returns to the main flow D again. This achieves stall improvement.

Next, FIG. 4 shows a second embodiment of the present invention.
5 shows another example of a vane body. In this embodiment, the vane body is manufactured by one arc-shaped plate 17 ′ (preferably an elastic plate).
Both ends are connected to the casing 13 and the outer ring 20 via pins 18 and 21, respectively, so as to form a complete circumferential wall when the vane body 17 'is closed as shown by a solid line.

FIG. 5 shows a third embodiment of the present invention.
In the present embodiment, the configuration of the vane body 17 is the same as the first embodiment described above.
Same as the embodiment, except that the casing 13
In that slits 28 formed in the axial direction are formed, and the vanes 17 are provided in these slits 28.

A stationary blade (not shown) located immediately upstream of the moving blade 12 has a variable pitch structure, and the change in the variable pitch angle and the opening and closing of the vane body are combined in a certain appropriate relationship. Is also good.

[0017]

As described above, according to the air separator of the axial blower according to the present invention, when the blower is operated at a distance from the stall region, the inner surface of the vane body is in contact with the inner surface of the casing. In the circumferential direction, the opening of the casing serving as the inlet of the air separator is closed by the vane body, thereby making it possible to eliminate the circulating flow in the air separator and to prevent the loss of power for generating the circulating flow. And thereby achieve high efficiency operation of a conventional blower. Further, when the blower approaches the stall region, the outer ring is rotated in the circumferential direction to pull up the vane body, and the opening of the casing is opened to form an air separator flow path, thereby exhibiting a stall improvement effect. it can. Therefore, according to the present invention, it is possible to achieve an excellent effect that a high efficiency and a high operating range can be achieved, and an axial flow fan which is very easy to use can be realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing an air separator of an axial blower according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of a vane body according to the embodiment.

FIG. 4 is a schematic configuration diagram showing another example of a vane body as a second embodiment of the present invention.

FIG. 5 is a sectional view of a main part showing an air separator of an axial blower according to a third embodiment of the present invention.

FIG. 6 is a partial sectional view showing an example of an air separator of a conventional axial blower.

FIG. 7 is an operation explanatory diagram of FIG. 6;

8 is a partially enlarged perspective view of FIG.

[Description of Signs] 12 ... rotor blade, 13 ... casing, 14
... recess, 15 ... vane first element, 16 ... vane second element, 17 ... vane body, 17 '... vane body, 20 ... outer ring,
23: air separator channel wall, 25: motor

Claims (1)

(57) [Claims] An air separator having a casing formed on the outer periphery of a moving blade of an axial blower and having a recess formed upstream from a moving blade of a casing portion facing a tip of the moving blade. A vane is disposed in each of the plurality of openings formed in the circumferential direction, and one end of the vane is supported by the casing, and the other end of the vane is rotatable in the circumferential direction. Connected to the ring, the shaft
Rotation of the outer ring in the circumferential direction near the stall point of the blower
The vane body is in the closed state of the opening such that the inner surface substantially coincides with the inner surface of the casing in the circumferential direction .
So that the inner surface is in an open state to open the opening.
Air separator axial flow fan, characterized by being composed.