JPH01249983A - Centripetal type blower - Google Patents

Abstract

PURPOSE:To prevent contraflow in a low flow region and maintain stability by providing movably a plurality of control plates in an intake path at the upstream side of an impeller. CONSTITUTION:A plurality of control plates 19 rotatable around a shaft parallel to a rotary shaft 18 of an impeller 17 are disposed in an intake path 14 at the upstream side of the impeller 17. When a motor 21 is driven to rotate the impeller 17, an air flow W sucked through the intake path 14 radially of the impeller 17 is accelerated by blades 16 while being discharged from a blower. On the other hand, even when an operative point is shifted to the low flow region, the generation of contraflow region in the intake path 14 can be prevented since the control plates 19 block the air flow flowing out in the outer peripheral direction of the impeller 17 by a centrifugal force.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a centripetal blower that sucks fluid centripetally from the outer circumference and discharges it from the center.

BACKGROUND OF THE INVENTION Conventionally, as shown in FIG. 7, this type of blower has a suction passage 4 formed between a main plate 1 and a sub-plate 3 having a bell mouth 2 in the center, and a suction passage 4 concentric with the bell mouth 2. hub 5
The impeller 7 has a plurality of blades 6 implanted on its outer peripheral surface, and when the impeller 7 is rotated by driving the motor 8, the impeller 7 passes through the suction passage 4. The airflow W sucked in from the radial direction of the rotating shaft 9 is accelerated by the blades 6.
is discharged in a direction almost parallel to the
Publication No. 593).

Problems to be Solved by the Invention However, in the above configuration, work is performed against the centrifugal force acting on the fluid, so when the load increases and the operating point moves to a low flow rate region, a backflow region occurs in the suction passage 4. occurs,
It becomes stalled. In addition, since the direction of discharge from the blower is limited to the direction parallel to the rotation axis 9 of the fan impeller 7, when changing the direction of discharge, a deflection plate (not shown) must be installed on the downstream side of the blower. There was a problem that the blower had to be installed and the size of the blower had to be increased.

The present invention solves these conventional problems, and at the same time prevents backflow in the low flow rate region and maintains stability.
The purpose is to enable control of the discharge direction of the airflow.

Means for Solving the Problems In order to solve the above problems, the present invention forms a suction passage between a main plate and a sub-plate having a bell mouth in the center, and forms a suction passage on the outer peripheral surface of a hub concentrically with the bell mouth. An impeller having a plurality of blades arranged thereon is installed, and a plurality of control plates are movably provided in the suction passage on the upstream side of the impeller, and the plurality of control plates are part of the impeller. The number or all of the sheets can be moved.

Effect The present invention has the above-described configuration, so that even if the operating point moves to a low flow rate region, the control plate prevents the air flow flowing out toward the outer circumferential direction of the impeller due to centrifugal force. It is possible to prevent the occurrence. Further, the discharge direction is influenced by the balance of the suction side load of the blower, and the discharge direction can be changed by controlling the position of the control plate and changing the load balance.

EXAMPLES Hereinafter, examples of the present invention will be explained based on FIGS. 1 to 6.

As shown in the figure, the blower has a main plate 11 and a bell mouth 12 in the center, and a suction passage 14 is formed between the main plate 11 and a sub plate 13. An impeller 17 having two blades 16 installed therein is arranged. Further, a plurality of control plates 19 are disposed within the suction passage 14 on the upstream side of the impeller 17 and are rotatable about an axis parallel to the rotation axis 18 of the impeller 170. These control plates 19 are arranged perpendicularly to the main plate 11 and the sub-plate 13, and are equally arranged around the outer periphery of the impeller 17, as shown in FIG. Further, the control plates 19 are divided into a plurality of groups by connecting three adjacent control plates 19 with a connecting plate 20, and by rotating one of the connected control plates 19, three control plates of the same group can be connected. 19 are configured to rotate at the same time. In addition, 21 shows a motor, and the solid line arrow shows the flow W of air.

In the above configuration, the impeller 17 is driven by the motor 21.
When the impeller 17 is rotated, the air flow W sucked in from the radial direction of the impeller 17 through the suction passage 14 is accelerated by the blades 16 and discharged from the blower.

On the other hand, even if the operating point moves to a low flow rate region, the control plate 19 prevents the airflow flowing toward the outer circumference of the impeller 17 due to centrifugal force, thereby preventing the generation of a backflow region within the suction passage 14. It is something that can be done. Further, the discharge direction is influenced by the balance of the suction side load of the blower. Therefore, by controlling the rotation angle θ of the control plate 190 and adjusting the balance of the load around the outer circumference of the impeller 17, the discharge direction can be changed.

That is, when changing the discharge direction, as shown in FIG. 4, by rotating a part of the control plate 19 and increasing the load on a part of the suction side, the flow from the impeller 17 is changed as shown in FIG. A part of the discharge flow comes to flow in the downstream obliquely outward direction. Also, as shown in FIG. 6, by rotating all of the control plates 19 to increase the overall load on the suction side, the entire discharge flow from the impeller 17 flows in the downstream obliquely outward direction as shown in FIG. It is something that becomes.

Effects of the Invention As described above, the blower of the present invention has the following effects. In other words, even if the operating point of the blower moves to a low flow area, the control board prevents the airflow from flowing out toward the outer circumference of the impeller due to centrifugal force, thereby preventing the generation of a backflow area in the suction passage. At the same time, the discharge direction can be changed by controlling the position of the control plate and adjusting the load balance around the outside of the impeller.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a centripetal blower according to an embodiment of the present invention, Fig. 2 is a plan view with the sub-plate of Fig. 1 removed, and Fig. 3 is a diagram in which the wind direction is changed by rotating a part of the control plate. Fig. 4 is a plan view with the secondary plate of Fig. 3 removed; Fig. 5 is a sectional view showing the situation when the entire control plate is rotated to change the wind direction; This figure is a plan view with the sub-plate of FIG. 5 removed, and FIG. 7 is a sectional view showing a conventional example. 11... Main plate, 12... Bell mouth,
13...Subplate, 14...Suction path, 15
...Nopu, 16...Tsubasa, 17...
... Impeller, 19... Control board. Name of agent: Patent attorney Toshio Nakao and one other person
-Mr. 1 12-・Bell mouth 13--・Shiri sign l Shiba 14- Yoiri road I5・-Hub 16- Wing 17-- Wing a Car 19- Control shoe Figure 1 Figure 2/' Do U Fig. 3ffl Fig. 4 dU Fig. 5

Claims (1)

[Claims] A suction path is formed between the main plate and a sub-plate having a bell mouth in the center, and an impeller having a plurality of blades is installed on the outer peripheral surface of the hub concentrically with the bell mouth, and A centripetal blower in which a plurality of control plates are movably provided in an intake passage on the upstream side of a vehicle, and some or all of the plurality of control plates can be moved.