JP2543130B2 - Centripetal blower - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centripetal blower that centrifuge a fluid from the outer peripheral direction and discharges the fluid from the center.

2. Description of the Related Art Conventionally, a blower of this type has a main plate 1 as shown in FIG.
And a secondary plate 3 having a bell mouth 2 in the center between the suction passage 4
And the inner periphery of the hub 5 is concentrically formed with a plurality of blades 6 on the outer peripheral surface of the hub 5, and the motor 8 is driven to drive the impeller. When 7 is rotated, the airflow W sucked from the radial direction of the impeller 7 through the suction passage 4 is accelerated by the blades 6 and is discharged in a direction substantially parallel to the rotation axis 9 (see, for example, Japanese Patent Laid-Open Publication No. Sho. 59−
593 publication).

However, in the above-mentioned configuration, since the work is performed against the centrifugal force acting on the fluid, when the load increases and the operating point moves to the low flow rate region, the reverse flow region in the suction passage 4 is generated. Occurs and the engine is in a stalled state. In addition, the discharge direction from the blower is
Since it is limited to a direction substantially parallel to the rotating shaft 9 of the impeller 7, when changing the discharge direction, it is necessary to provide a deflecting plate (not shown) on the downstream side of the blower, and the blower becomes large. There was a problem to do.

The present invention solves such conventional problems,
The purpose is to prevent backflow in the low flow rate range and maintain stability, while at the same time enabling control of the discharge direction of the airflow.

Means for Solving the Problems In order to solve the above problems, the present invention forms an intake passage between a main plate and a sub plate having a bell mouth at the center, and concentrically with the bell mouth, an outer peripheral surface of a hub. An impeller with a plurality of blades is installed on the top, and an intake passage is formed between the main plate and the auxiliary plate having a bell mouth in the center, and concentrically with the bell mouth on the outer peripheral surface of the hub. It has an impeller in which a plurality of blades are arranged, and a plurality of control blades provided with a plurality of simultaneously movable control plates are arranged in the suction passage of the impeller.

Action The present invention has the above-described configuration, and even when the operating point moves to the low flow rate region, the control plate blocks the air flow that flows out in the outer circumferential direction of the impeller due to the centrifugal force, so that the reverse flow region in the suction passage is generated. Can be prevented. Also,
The discharge direction depends on the load balance on the suction side of the blower, and the discharge direction can be changed by controlling the position of the control plate to change the load balance.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

As shown in the figure, the blower consists of a main plate 11 and a bellmouth in the center.
A suction passage 14 is formed between the pick-up sub-plate 13 having 12 and the impeller 17 in which a plurality of blades 16 are planted on the outer peripheral surface of the hub 15 concentrically with the bell mouth 12. There is. Also,
In the suction passage 14 on the upstream side of the impeller 17, a plurality of control plates 19 which are rotatable about an axis parallel to the rotation axis 18 of the impeller 17 are arranged. These control plates 19 are arranged so as to be perpendicular to the main plate 11 and the sub plate 13, and are evenly arranged around the outer periphery of the impeller 17 as shown in FIG. Further, the control plate 19 has three adjacent blades connected by a connecting plate 20 to form a control blade, and a plurality of control blades are arranged so that each control blade can move independently. In addition, 21 shows a motor and a solid line arrow shows the flow W of air.

In the above configuration, when the motor 21 is driven to rotate the impeller 17, the air flow W sucked from the radial direction of the impeller 17 through the suction passage 14 is discharged from the blower while being accelerated by the blades 16. . On the other hand, even if the operating point moves to the low flow rate region, the control plate 19 blocks the air flow that flows out in the outer peripheral direction of the impeller 17 due to the centrifugal force, so that the occurrence of the reverse flow region in the suction passage 14 is prevented. Is something that can be done. In addition, the discharge direction depends on the balance of the load on the suction side of the blower. Therefore, the discharge direction can be changed by controlling the rotation angle θ of the control plate 19, that is, the rotation angle of the control blades to adjust the load balance around the outer periphery of the impeller 17.

That is, when the discharge direction is changed, as shown in FIG. 4, the control blades composed of the plurality of control plates 19 are rotated to increase a part of the load on the suction side, so that the blades as shown in FIG. A part of the discharge flow from the vehicle 17 comes to flow in the obliquely downstream direction. Further, by rotating all of the plurality of control blades as shown in FIG. 6 to increase the load on the suction side as a whole, the entire discharge flow from the impeller 17 flows in the downstream oblique direction as shown in FIG. It will be like this.

Effects of the Invention As described above, the blower of the present invention has the following effects. That is, even when the operating point of the blower moves to the low flow rate region, the control plate blocks the air flow that flows out in the outer peripheral direction of the impeller due to the centrifugal force, so that it is possible to prevent the occurrence of the reverse flow region in the suction passage. At the same time, it is possible to change the discharge direction by controlling the position state of the control plate and adjusting the balance of the load around the outside of the impeller.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a centripetal fan according to an embodiment of the present invention, FIG. 2 is a plan view in which the sub-plate of FIG. 1 is removed, and FIG. 3 is a partial rotation of a control plate to change the wind direction. FIG. 4 is a cross-sectional view showing a state of the case, FIG. 4 is a plan view in which the sub plate of FIG. 3 is removed,
FIG. 5 is a cross-sectional view showing a state where the wind direction is changed by rotating the entire control plate, FIG. 6 is a plan view with the sub-plate of FIG. 5 removed, and FIG. 7 is a cross-sectional view showing a conventional example. Is. 11 …… Main plate, 12 …… Bell mouth, 13 …… Secondary plate, 14 …… Suction passage, 15 …… Hub, 16 …… Wing, 17 …… Imperor, 19 …… Control plate.

Claims (1)

(57) [Claims] 1. An impeller in which a suction passage is formed between a main plate and a sub plate having a bell mouth in the center, and a plurality of blades are arranged concentrically with the bell mouth on an outer peripheral surface of a hub. A centripetal fan having a plurality of control blades provided with a plurality of control plates that can be simultaneously moved in the suction passage of the impeller.