JPH0599194A - Blast adjuster for air blower - Google Patents

Abstract

PURPOSE:To reduce suction resistance and prevent lower efficiency of a fan by mounting a cylindrical damper in an air suction space at the center of an air suction runner and changing a volume for sucking air in the space with the mounting and demounting operation of the damper to adjust a blast quantity. CONSTITUTION:As damper 3 is not fitted into a central space 11 in a runner 1 at first, there is no change in volume for sucking air in the central space 11, and air entering from an inlet cone 2 is blown out of a gap between fins 12, 12 by the rotation of the runner 1 into an air duct at the maximum blast quantity. Next, when an operational control 51 is turned clockwise and the damper 3 is fitted into the central space 11, there is a decrease in volume for sucking air in the central space 11 in proportion to the fit-in distance of the damper 3 and so a decrease in blast quantity in proportion to the fit-in distance of the damper 3. That is, narrowing a space between the runner 1 and the damper 3 leads to a blast quantity of 0%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air blower for an air conditioner, which is capable of freely adjusting the air flow rate from 100 to 0%.

[0002]

2. Description of the Related Art As a conventional device of this type, which has a structure shown in FIG. 3, a plurality of vanes c ... C are provided between a ring a and a bearing b at the center. It is rotatably supported, and by changing the rotation angle of one vane c, the rotation angles of the other vanes c ... c are all changed to the same angle. This device is attached to the inlet cone of the blower. Then, the intake area of the inlet cone is changed by changing the rotation angle of the vanes c ...
The amount of air blown is variable, that is, adjusted.
However, in this device, since there is a gap between the adjacent vanes, even if the vanes are fully closed, not only can the air flow rate be reduced to 35% or less due to the inflow of air from the gap, When the rotation angle of the vane increases, the air resistance due to the vane increases, so the fan efficiency decreases, and the vane vibrates and emits noise.
Furthermore, since there is no proportional relationship between the rotation angle of the vane and the intake area, the relationship between the rotation angle of the vane and the air flow rate is plotted, and the air flow rate is adjusted by changing the rotation angle of the vane based on the graph. This is necessary, and in the case of automatic adjustment, the above-mentioned relationship must be programmed in the operating machine, which is troublesome and has various drawbacks.

[0003]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention inserts and removes a cylindrical damper in the air introducing space at the center of the runner, thereby proportional to the insertion length of the damper. It is an object of the present invention to provide an air flow rate adjusting device for an air blower capable of changing the air flow rate from 100% to 0%.

[0004]

DISCLOSURE OF THE INVENTION An air flow rate adjusting device according to the present invention is a blower comprising a runner 1 driven by a motor to rotate and an inlet cone 2 for supplying air to a central portion of the runner. A cylindrical damper 3 having a diameter larger than the outer diameter of the cylindrical portion 21 and smaller than the inner diameter of the central space portion 11 of the runner 1 is provided so as to cover the cylindrical portion 21, and the damper is provided in the central space portion 11 of the runner 1. It is characterized in that a guide mechanism 4 for slidably holding it so that it can be inserted therein and an actuating mechanism 5 for linearly reciprocating the damper are provided. The guide mechanism 4 includes a plurality of rods 4 between the flanges 42 formed on the inner surface of the guide ring 41 integrally welded to the inlet cone 2.
3 is provided, and the flange 31 formed at the end portion of the damper 3 is welded and fixed to the slider 44 which is guided and slid by the rod. This mechanism holds the damper 3 so as to be slidable left and right. Is. Also, the operating mechanism 5
Is an operating knob 51 having a rotating shaft fitted from the outside to the inside of the guide ring 41, an operating rod 52 integrally fixed to the rotating shaft of the operating knob, and an operating rod 52 fixed to the outer peripheral surface of the damper 3 by welding. It is composed of a plate 53 having a long hole 53a into which a tip bent portion is fitted. The operating lever 52 is swung by rotating the operating knob 51 to reciprocally slide the damper 3 left and right. .

[0005]

The operation of the apparatus of the present invention will be described with reference to the illustrated embodiment according to the above-described structure of the present invention. That is, in the state shown in FIG. 1, since the damper 3 is not fitted in the central space portion 11 of the runner 1, there is no change in the volume of sucking air in the central space portion 11, and the damper 3 enters from the inlet cone 2. The air that comes in is fin 1 by the rotation of runner 1.
It is blown out from the gap of 2 ... 12 and is blown to the blowing path.
In other words, at this time, the air flow rate is 100% (maximum air flow rate)
Is. Then, rotate the operation knob 51 clockwise,
When the damper 3 is fitted in the central space 11, the volume of air sucked in the central space 11 decreases in proportion to the fitting distance of the damper 3, so the amount of air blown is the same.
The amount of air blown is reduced in proportion to the insertion distance, and when the damper 3 is completely inserted as shown in FIG. In the illustrated state, the runner 1 and the damper 3 are spaced so that they do not come into contact with each other, so the air flow does not reach 0%, but by narrowing this space, the air flow can approach 0%. Is. In addition, when the operating rod 52 is sufficiently long, the movement distance of the damper 3 may be said to be approximately proportional to the swing angle of the operating rod 52, that is, the rotation angle of the operating knob 51, so for example, rotation of 30 degrees. If the damper 3 moves from the maximum air flow rate to the minimum air flow rate,
The air flow rate changes in proportion to the rotation angle of the operation knob 51, such as 1/2 of the difference between the maximum and minimum air flow rates when the rotation angle is 15 degrees, and 1/4 when the rotation angle is 22.5 degrees. is there.

[0006]

As described above, in the air flow rate adjusting device according to the present invention, the cylindrical damper is inserted into and removed from the air introducing space at the center of the runner for sucking air, thereby removing the air in the space. Since the amount of air blown is adjusted by changing the volume of suction, there is nothing to put a resistance to the inflowing air unlike the conventional device, the fan efficiency does not decrease, and noise is emitted. In addition, the amount of air blown can be changed from 100% to 0% in proportion to the fitting distance of the damper, that is, the moving distance. It was possible to achieve an air flow rate of 0% that could not be achieved without stopping the rotation of the runner, and since proportional control became possible, in the case of automatic adjustment, the rotation angle of the vane was the same as that of the conventional device. It is not necessary to program the relationship between the air volume in the operating device, it is easy to great equal practical effect air volume control is convenient to perform. The illustrated guide mechanism and actuating mechanism are one embodiment of the present invention, and the guide mechanism may have any structure as long as it can support the damper slidably in the left and right directions. Also, the actuating mechanism may be of a structure capable of reciprocating linear movement of the damper, such as an air cylinder, and is not limited to the embodiment.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional side view of a blower equipped with the device of the present invention at the time of supplying a maximum blown air amount.

FIG. 2 is a schematic vertical sectional side view of the same when a minimum air flow rate is supplied.

FIG. 3 is a schematic front view of a blower equipped with a conventional device.

[Explanation of symbols]

 1 Runner 2 Inlet cone 3 Damper 4 Guide mechanism 5 Actuating mechanism

Claims (1)

[Claims] 1. A runner 1 which is driven by a motor to rotate.
And an inlet cone 2 for supplying air to the center of the runner, the inlet cone 2
The cylindrical damper 3 having a larger diameter than the outer diameter of the cylindrical portion 21 and a smaller diameter than the inner diameter of the central space portion 11 of the runner 1.
1, a guide mechanism 4 for slidably holding the damper so that it can be inserted into the central space 11 of the runner 1, and an operating mechanism 5 for linearly reciprocating the damper. An air flow rate adjusting device for a blower.