JPH0727440Y2 - Blower that automatically opens and closes the air passage - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower having a function of automatically opening and closing a blower path.

[0002]

2. Description of the Related Art As a blower used for improving ventilation, it is common to rotate several blower blades provided in a ventilation passage. However, in the conventional blower as shown in FIG. The blades are fixed at an angle effective for blowing air. Therefore, when the blower blades are stationary, it is impossible to block the gaps, and there is a problem that dust or the like enters through the gaps. When such a blower is used as a cooling device for electric appliances, foreign matter accumulates inside the product, which causes a failure such as a short circuit.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its purpose is to automatically ventilate the air when the operation is stopped without using other power. It is to provide a blower capable of blocking a road.

[0004]

Means for Solving the Problems The above-mentioned object is to provide an output shaft coaxially provided in an air passage, an impeller shaft coaxially attached to a drive shaft, and a central axis of a cylindrical portion of the impeller shaft at a right angle.
Also, control shafts that are evenly arranged on the same circumferential line of the cylindrical part, and are mounted so as to be reciprocally rotatable about their own central axes within a fixed angle range, and are attached to the respective control shafts. When reciprocally rotated to reciprocally rotate between the ventilation passage closed position that coincides with a plane perpendicular to the center line of the cylindrical surface and the inclined air blow operation position, and when the ventilation passage is closed. Is a blower blade having a shape capable of substantially closing the space between the ventilation passage and the outer surface of the cylindrical portion of the impeller shaft, and the fan blade provided on the impeller shaft. While keeping the road closed position,
This can be achieved by a blower including a blower vane position control device that holds the blower in an operating position during rotation.

[0005]

With the above-mentioned structure, the ventilation passage of the blower can be closed while the operation is stopped without using other power.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the configuration of the present invention will be specifically described with reference to the drawings. FIG. 1 is a vertical sectional view showing a stationary state of an embodiment of a blower for automatically opening and closing an air passage according to the present invention, FIG. 2 is a sectional view taken along the line AA 'in FIG. 1, and FIG. -B 'line sectional view, FIG. 4 is an AA' line sectional view showing the operating state of the embodiment shown in FIG. 1, and FIG. 5 is a BB 'line showing the operating state of the embodiment shown in FIG. Cross section,
FIG. 6 is a side view showing an operating state of the embodiment shown in FIG. 1, and FIG. 7 is a perspective view showing a conventional blower.

In the figure, 1 is a motor, 1a is its output shaft,
10 is a threaded joint attached to the tip of the output shaft 1a, 2
Is an impeller shaft attached to the output shaft 1a, 2a is its cylindrical portion, 2b is a disk portion provided so as to close one end of the cylindrical portion 2a on the side of the screw joint 10, 2c and 2d are disk portions 2b.
A pair of holes provided in the, 3 is a cover, 3a female screw, 4
Reference numerals 5 and 5 denote a pair of weights provided on the outer surface of the disk portion 2b and are moved by centrifugal force. Reference numerals 40 and 50 denote pins for pivotally supporting the weights 4 and 5, 41 and 51 are springs, and 42 and 52 are weights 4. 5, a motion axis attached to 5, a disk-shaped rotation transmission disk 6, 6a and 6b, holes provided in the rotation transmission disk 6,
c is a groove portion provided at equal intervals on the edge of the rotation transmission plate 6, and 7
Is an L-shaped control shaft, and 8 is a blower blade.

First, FIGS. 1 to 3 will be described.
The motor 1 and its output shaft 1a are coaxially provided in a ventilation passage having a circular cross section (not shown).

The pair of weights 4 and 5 are of a hammer shape, and have pins 40 and 50 provided at symmetrical positions with respect to the rotation center axis of the disk portion 2b so as to be rotationally symmetric with respect to the rotation center axis. And rotatably attached in a plane parallel to the disc portion 2b. The weights 4 and 5 are held by springs 41 and 51 so that when the impeller shaft 2 is stationary, the weights 4 and 5 approach the center side. The movement shafts 42 and 52 are connected to the output shaft 1 in the middle of the portion of the weights 4 and 5 corresponding to the handle of the hammer.
It is provided parallel to a. Hole 2 provided in disk portion 21
Reference characters c and 2d are elongated arcuate holes centered on the pins 40 and 50, respectively, and are provided symmetrically with respect to the rotation center axis so that the movement axes 42 and 52 can freely reciprocate.
Further, the motion shaft 31 penetrates the holes 2c and 2d.

Further, inside the impeller shaft 2, a rotation transmission disk 6 is parallel to the disk portion 2b, coaxial with the output shaft 1a, and
It is rotatably provided. Hole 6 provided in rotation transmission board 6
The a and 6b are elongated and rotationally symmetrical in directions different from the holes 2c and 2d so that the motion axes 42 and 52 can reciprocate, and the motion axes 42 and 52 pass through the holes 6a and 6b.

Further, the groove portion 6c of the rotation transmission plate 6 is provided at six places, and one end 7a of the control shaft 7 is fitted into the groove portion 6c. The other end 7b of the control shaft 7 is fitted into a hole provided in the cylindrical portion 2a of the impeller shaft 2 and is attached so as to be reciprocally rotatable within a fixed angle range.

An end portion 7b on the rotary shaft side of the control shaft 7 communicates with the outside of the cylindrical portion 2a, and a blower blade 8 is provided at each end portion. The blower blade 8 reciprocates between the closed position of the ventilation passage that coincides with a plane perpendicular to the central axis of the impeller shaft 2 and the blower operation position that is inclined with respect to this plane as the control shaft 7 rotates. Move. The outer side of the blower blade 8 is close to the wall portion of the ventilation passage, and the inner side thereof is close to the outer surface of the cylindrical portion 2a of the impeller shaft 2. The blower blade 8 is located at the ventilation passage blocking position. At some times, the space between the ventilation passage and the cylindrical portion 2a of the impeller shaft 2 can be substantially closed by the six blower blades 6.

On the outer surface side of the disc portion 2b of the impeller shaft 2, there is provided a cover 3 which does not block the ventilation passage and can cover the weights 4 and 5. The cover 3 has an internal thread 3a corresponding to the threaded joint 10 attached to the end of the output shaft 1a, and is firmly connected to the impeller shaft 2.

In the blower according to the present invention constructed as described above, when the output shaft 1a is stationary, the ventilation passage is closed by the six ventilation blades 6 at the ventilation passage closing position.
When the output shaft 1a rotates, the impeller shaft 2 rotates, centrifugal force acts, and as shown in FIG. 4, the weights 4 and 5 rotatably supported rotate outward, and the motion shafts 42 and 52 move accordingly. Hole 2
Move along c and 2d.

The movement shafts 42 and 52 pass through the holes 6a and 6b, and the directions of the holes 6a and 6b are 2c and 2d.
5, the rotation transmission plate 6 rotates relative to the impeller shaft 2 by a constant angle with the movement of the motion shafts 42 and 52, as shown in FIG. When the rotation transmission board 6 rotates, the free end 7 of the control shaft 7 inserted into the groove 6c thereof.
Since a is pushed, the control shaft 7 rotates. When the control shaft 7 rotates, the blower blades 8 connected to the end of the control shaft 7 rotate to occupy the blower operating position, so that the blower starts as shown in FIG. When the rotation of the output shaft 1a stops, the impeller shaft 2 also stops and the weights 4 and 5 move to the center side by the action of the springs 41 and 51, so that the blower blades 6 return to the ventilation passage closed position. .

The structure of the present invention is not limited to the above-described embodiment. For example, the blowing blades may be curved instead of a flat plate, or may be overlapped to some extent.
Further, the number of sheets is not limited to six, and a gear or other device may be used as a device for transmitting the operation of the weight to the blower blade. Although omitted in the above description, in order to prevent a gap from being formed between the outer surface of the cylindrical portion and the blower blade at rest, a protrusion that does not prevent the rotation of the blower blade on the outer surface of the cylindrical portion 2a. It is also recommended to provide. Further, the weight, the rotation transmitting hole, and the shapes of other parts can be freely designed and modified within the scope of the object of the present invention, and the present invention includes all these modifications.

[0017]

Since the present invention is constructed as described above, according to the present invention, it is possible to provide a blower capable of automatically closing the ventilation passage when the ventilation is stopped.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a stationary state of an embodiment of a blower that automatically opens and closes an air passage according to the present invention.

FIG. 2 is a sectional view taken along the line AA ′ of FIG.

3 is a sectional view taken along line BB ′ of FIG.

FIG. 4 is an AA ′ showing an operating state of the embodiment shown in FIG.
It is a line sectional view.

5 is a BB ′ showing an operating state of the embodiment shown in FIG.
It is a line sectional view.

FIG. 6 is a side view showing an operating state of the embodiment shown in FIG.

FIG. 7 is a perspective view showing a conventional blower.

[Explanation of symbols]

 1 ・ ・ ・ ・ ・ ・ Motor 1a ・ ・ ・ ・ ・ ・ Output shaft 10 ・ ・ ・ ・ ・ ・ Screw joint 2 ・ ・ ・ ・ ・ ・ Impeller shaft 2a ・ ・ ・ ・・ ・ ・ ・ Cylinder part 2b ・ ・ ・ ・ ・ ・ ・ ・ Disc part 2c ・ ・ ・ ・ ・ ・ Hole 2d ・ ・ ・ ・ ・ ・ Hole 3 ・ ・ ・ ・ ・ ・ Cover 3a ・··· Female screw 4 ··· · Weight 40 ··· Pin 41 ··· Spring 42 ··· Movement axis 5 ・ ・ ・ ・ ・ ・ ・ ・ Weight 50 ・ ・ ・ ・ ・ ・ Pin 51 ・ ・ ・ ・ ・ ・ Spring 52 ・ ・ ・ ・ ・ ・ ・ ・ Motion axis 6 ・ ・ ・...... Rotation transmission board 6a ・ ・ ・ ・ ・ ・ Hole 6b ・ ・ ・ ・ ・ ・ ・ ・ Hole 6c ・ ・ ・ ・ ・ ・ Groove 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ Control shaft 7a ・ ・ ・ ・ ・ ・ One end of control axis 7b ・ ・ ・ ・ ・ ・ of control axis End 8 ......... blower blades A-A '······ break line B-B' ······ break line

Claims (2)

[Scope of utility model registration request] 1. A blower provided in a ventilation passage having a circular cross section, the output shaft (1a) being provided coaxially in the ventilation passage, and an impeller shaft (2) coaxially attached to the output shaft (1a).
And are arranged at right angles to the central axis of the cylindrical portion (2a) of the impeller shaft (2) and evenly on the same circumferential line of the cylindrical surface, and reciprocally rotate about their own central axes within a certain angle range. A control shaft (7) that is movably attached, and is attached to each of the control shafts (7) and reciprocally rotates together with the control shaft (7) to coincide with a plane perpendicular to the center line of the cylindrical portion (2a). When the air passage is closed, the air passage and the outer surface of the cylindrical portion (2a) of the impeller shaft (2) are rotated when the air passage is closed. Blower vane (8) having a shape capable of substantially closing the space between
And a blower blade provided on the impeller shaft (2) for holding the blower blade (8) in its ventilation passage closed position when the impeller shaft (2) is stationary and for holding it in the blower working position during rotation. The blower described above, which comprises a position control device. 2. A blower blade position control device is swingably supported by an impeller shaft (2) in a plane perpendicular to the central axis thereof, and reciprocates between a ventilation passage closed position and a blower operation position by centrifugal force. A pair of moving weights (4, 5) and springs (41, 51) that hold the weights (4, 5) in the air passage closed position when the impeller shaft (2) is stationary.
The blower according to claim 1, further comprising: a rotation transmission device that transmits the reciprocating motion of the weights (4, 5) to the control shaft (7) as a rotary motion.