JPS6310319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a blower for blowing air in an air conditioner or the like, and particularly to a multi-blade blower that can change the direction of air discharge.

Conventional Structure and Problems Conventionally, in a multi-blade blower, the following method has been common for changing the direction of air discharge from the blower.

That is, as shown in FIG. 1, a multi-blade impeller 2 is arranged inside a spiral casing 1,
The impeller 2 is rotated by driving the electric motor 3 for driving the impeller 2, and air is sucked from the air supply port 4 provided on the front of the casing 1. A first discharge port 5 and a second discharge port 6 on the rear surface are provided so that they can be alternately opened and closed by a damper 7, and by operating the damper 7, the direction of air discharge is changed.

However, in the configuration of the multi-blade blower shown in FIG. 1, it is most effective to discharge from the first discharge port 5, but when the first discharge port 5 is closed and the discharge is discharged from the second discharge port 6. , after the airflow from the impeller 2 violently collides with the damper 7, the second discharge port 6
This caused a significant drop in blower performance. Further, the direction of the air flow is also limited to the direction from the air supply port 4 to the first discharge port 5 or the second discharge port 6 direction. In addition, in FIG. 1, solid line arrows indicate air flow.

OBJECTS OF THE INVENTION The present invention aims to provide a blower that can effectively change the direction of air discharge from the blower and also change the direction of air supply.

Structure of the Invention In order to achieve this object, the present invention opens and closes the first discharge port and the second discharge port with a single damper, and the first discharge port is located downstream of the fixed first tongue. In addition, the tip of the damper is a second tongue, the second tongue is movable according to opening and closing of the damper, and a backflow valve is arranged at the first discharge port. be.

With the above configuration, the second
By moving the tongue of the blower, the discharge direction can be effectively changed, and the flow direction inside the blower can also be changed.

DESCRIPTION OF EMBODIMENTS Examples of the present invention are shown in FIGS. 2 to 5 below.

FIG. 2 shows a blower B configured by arranging a multi-blade impeller 12 inside a spiral casing 11.
2 and a first tongue portion 13 fixed to a portion adjacent to the casing 11 and forming a part of the casing 11.
is provided, and a first discharge port 14 is provided downstream thereof. On the other hand, a second discharge port 15 is provided on the side surface of the spiral casing 11, and both discharge ports 14, 15 are provided.
is configured to be able to be opened and closed alternately by a damper 17 that rotates around a rotating shaft 16. Furthermore, a second tongue portion 18 is provided at the tip of the damper 17 and is movable as the damper 17 rotates. 3 shows the case where the second discharge port 15 is closed by the damper 17, and FIG. 4 shows the case where the second discharge port 15 is closed by the damper 17.
The case where the is closed is shown below. Further, in FIG. 5, a back wind valve 21 is disposed outside the first discharge port 14 to close the discharge port 14 by its own weight, and in particular, the first discharge port 14 is
This structure is designed to prevent air from flowing into the blower B. Note that in FIGS. 2 to 5, the same numbers indicate the same parts, 19 indicates an air supply port provided in the front of the casing 11 in front of the impeller 12, and 20 indicates an electric motor that drives the impeller. Furthermore, the dashed-dotted line arrow indicates the flow of air sucked from the air supply port 19,
Solid arrows indicate the flow of air sucked from the first discharge port 14.

Next, the effects of this configuration will be described. First, as shown in FIG. 3, by closing the second discharge port 15 with the damper 17, the air flow sucked from the air supply port 19 is discharged from the first discharge port 14. Next, as shown in FIG. 4, by closing the first discharge port 14 with the damper 17, the air supply port
The airflow sucked from the air outlet 9 is discharged from the second discharge port 15 . However, as shown in FIG. 2, by configuring the tip of the damper 17 as a second tongue 18 and moving the position of the second tongue 18 with respect to the outer circumference of the impeller 12 as the damper 17 rotates, An air flow (indicated by a solid arrow) is generated from the first discharge port 14 into the blower B. That is, the airflow discharged from the second discharge port 15 is a combination of the airflow sucked from the air supply port 19 and the first discharge port 14, and
It has the feature that the amount of air from the discharge port 15 can be significantly increased.

Furthermore, as shown in FIG.
4. By providing a back wind valve 21 on the outside that closes the first discharge port 14 by its own weight, the first discharge port 14
It is possible to block the suction air flow from
In this case, as shown in FIG.
This configuration has the feature that the amount of air discharged from the second discharge port 15 can be significantly increased compared to a configuration in which the second discharge port 14 is closed by a damper 17.

Effects of the Invention According to the present invention, by providing a movable second tongue in addition to the fixed first tongue, when switching the amount of air discharged from two discharge ports with a damper, In other words, the resistance can be made extremely small, that is, it can be effectively switched to fully exhibit the blower performance.

Furthermore, the flow direction of the air at the first discharge port can be reversed, and the suction air from the first discharge port also joins the discharge air flow from the second discharge port, so the amount of discharged air can be greatly increased. This is something that can be increased to

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional multi-blade blower, Fig. 2a is a side sectional view of a multi-blade blower according to an embodiment of the present invention, Fig. 2b is a sectional view of the plane, and Fig. 3a is a side cross-sectional view showing a state in which the damper closes the discharge port. FIG. 3b is a sectional view of the same plane, and FIG. 4a is a side sectional view showing the damper in a state where the discharge port is opened.
FIG. 4b is a sectional view of the same plane, FIG. 5a is a side sectional view showing another embodiment of the present invention, and FIG. 5b is a sectional view of the same plane. B...Blower, 13...First tongue, 14...
First discharge port, 15...Second discharge port, 17...
Damper, 18... second tongue, 19... air supply port, 21... ventilation valve.

Claims (1)

[Claims] 1. The first discharge port and the second discharge port are opened and closed by a single damper, and a first tongue is provided downstream of the fixed first tongue.
A multi-blade blower in which a discharge port of the damper is located, and a tip of the damper is a second tongue, and the second tongue is movable according to opening and closing of the damper. 2. The multi-blade blower according to claim 1, wherein a blower valve is provided at the first discharge port.