JPH034799Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an axial flow fan used in ventilation fans, etc., and particularly to an axial flow fan that can reverse the direction of air blowing without changing the direction of rotation of the blades. be.

(Prior art) As an axial flow fan of the above-mentioned method,
In the system disclosed in Publication No. 16810, a shaft with a blade fixed to one end is slidably and rotatably inserted into a boss, is urged outward by a spring, and a suction side pin groove is formed in the inner edge of the boss. A pin groove is formed on the extrusion side, and a pin is attached to the other end of the shaft.

(Problem to be solved by the invention) According to the conventional device described above, in order to reverse the direction of air blowing, the blade is pushed against the spring to remove the pin from one pin groove, and then the blade is rotated and installed. After changing the angle, the pin must be engaged in the other pin groove. Moreover, this operation has to be repeated for each of the plurality of blades, making the switching operation extremely troublesome.

(Means for Solving the Problems) The present invention solves the above-mentioned drawbacks and provides an axial flow fan that can change the mounting angle of all the blades at once and reverse the blowing direction with a simple operation. This is the purpose.

The structure of the present invention that meets this purpose includes a switching operation member that is movably inserted into a through hole provided in the casing and can be held in the forward position by a stopper, and a switching member that is fixed to the drive shaft and has a hole on the outer peripheral surface. A bored boss, a crankshaft having one end rotatably fitted into the hole, the other end protruding in the radial direction of the boss, and a crank portion formed in the middle, and a crankshaft fixed to the other end of the crankshaft. a spring having one end locked to the crank part and the other end to the boss for rotationally biasing the crank part in the direction of standing up;
The gist of the present invention is to include a cylindrical actuating member whose lower open end is engaged with the crank portion and whose upper surface is connected to the lower end surface of the switching operation member via a bearing.

(Function) According to the present invention, when the switching operation member is pushed and moved to the forward position, the operating member is pushed down by the lower end surface of the switching operation member via the bearing, and accordingly, the crank part resists the spring. When it is knocked down, the crankshaft rotates, and the mounting angle of the blade fixed to the tip of the crankshaft changes to the forward direction for blowing air. Next, the switching member is held in the forward position by the stopper, and in this state, the drive shaft is rotated in a certain direction to drive the blades, thereby blowing air in the forward direction. At this time, the operating member also rotates together with the boss around the drive shaft, but since a bearing is interposed between the switching member and the operating member to reduce friction between the two, the switching member rotates. do not.

Next, when the restriction by the stopper is released, the crank section is raised by the spring, and the operating member is accordingly pushed up by the operating member and displaced to the retracted position. At the same time, the crankshaft rotates and the blade installation angle returns to the reverse direction. In this state, if the blades are rotated in the same direction as when blowing air in the forward direction, air will be blown in the opposite direction.

(Example) Examples of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 to 3, 1 is a casing, and safety guards 2 are attached to the front and back surfaces to form an air passage. A long groove 4' and a through hole 4 are formed in the center of the surface of the casing 1, and a push rod 5, which is a switching operation member, is loosely fitted into the through hole 4 so as to be movable forward and backward and rotatable. pushyrod 5
An operating knob 6 is attached to the upper end surface, a stopper 7 is provided on the outer peripheral surface, and a recess 8 is provided on the lower end surface.
is formed. On the other hand, a motor 9 is attached to the center of the back surface of the casing 1, and a boss 11 is fixed to a drive shaft 10 of the motor 9. this boss 1
Four holes 12 are bored in the outer periphery of 1, and a thin cylindrical rim 13 is integrally formed.
A crankshaft 14 has one end rotatably fitted into the hole 12, the other end passing through the peripheral wall of the rim 13, and a crank portion 15 formed in the middle. A blade 16 is fixed to the other end of the crankshaft 14. Further, a spring 17 is wound around the crankshaft 14, one end of which engages with the crank portion 15, and the other end of which engages with the peripheral wall of the rim 13, and always urges the crank portion 15 in the direction of standing up. Next, a cylindrical actuating member 18 is placed over the boss 11, and a groove 19 is carved in the open end of the lower surface of the actuating member 18, as shown in FIG. The crank portion 15 is loosely fitted, and the upper surface of the operating member 18 is connected to the lower end surface of the push rod 5 via a steel bearing 20 inserted into the recess 8. Since the crank portion 15 is always biased in the upright direction by the spring 17, the upper surface of the actuating member 18 always follows the movement of the lower end surface of the push rod 5 due to the action of the spring 17.

The present embodiment has the above configuration, and its operation will be explained next.

To blow air in the forward direction, as shown in Figure 1, grasp the operating knob 6 and push down the push rod 5, then rotate the push rod 6 slightly to remove the stopper 7 from the long groove 4', and insert the stopper 7 through the hole. 4 to lock it in the forward position. By pushing down the push rod 5, the operating member 18 is also pushed down via the bearing 20, and the crank portion 15 is pushed down against the biasing force of the spring 17. Along with this, crankshaft 1
4 rotates about 120 degrees, and the mounting angle of the blade 16 fixed to the tip changes to the one for forward air blowing, as shown in FIG. In this state, the motor 9 is started and the blade 16 is
Air is blown in the forward direction (see arrow B in FIG. 5), which rotates in a certain direction (see arrow A in FIG. 5). When the blade 16 rotates, the actuating member 18 also rotates together with the blade. Since a bearing 20 is interposed between the actuating member 18 and the lower end surface of the push rod 5, the push rod 5 rotates together with the actuating member 18. It does not rotate.

Next, to blow air in the opposite direction, turn the operating knob 6 slightly to stop the stopper 7, as shown in Figure 2.
into the long groove 4'. Then, the push rod 5 becomes movable upward, so that the crank portion 15 is erected by the biasing force of the spring 17, the crankshaft 14 is rotated, and the mounting angle of the blades is returned to the direction for blowing air in the opposite direction. In this state, when the blade 16 is rotated in a fixed direction as in the case of forward air blowing, air is sent in the opposite direction (see arrow C in FIG. 5).

In this embodiment, the forward and reverse switching of the air blowing direction has been described, but if the switching operation member is configured to be able to adjust the forward and backward movement, it is possible to not only simply switch the air blowing direction between forward and reverse, but also change the air volume at the same rotation speed. is also possible. Furthermore, the rotary power source for the blades is not limited to the electric motor, but may be an internal combustion engine such as a gasoline engine.

(Effect of the invention) According to the invention, when switching the air blowing direction of an axial fan, by simply moving a single switching operation member forward or backward, the mounting angle of all the blades can be changed simultaneously to forward or reverse direction. There is no need to change the mounting angle for each blade, and the switching operation is extremely simple and easy.

[Brief explanation of drawings]

1 and 2 are partially cutaway front views showing an embodiment of the present invention, FIG. 3 is a plan view of essential parts of the embodiment, and FIG. 4 is an enlarged sectional view taken along the line X-X of FIG. FIG. 5 is an explanatory diagram showing the relationship between the mounting angle of the blade and the air blowing direction. DESCRIPTION OF SYMBOLS 1...Casing, 4...Through hole, 5...Push rod (switching operation member), 7...Stopper, 10...Drive shaft, 11...Boss, 12...
Hole, 14... Crankshaft, 15... Crank part, 16... Vane, 17... Spring, 17
...Operating member, 20...Bearing.

Claims (1)

[Scope of utility model registration request] It is inserted into the through hole provided in the casing so that it can move forward and backward.
A switching operation member that can be held in the forward position by a stopper, a boss that is fixed to the drive shaft and has a hole in its outer circumferential surface, one end of which is rotatably fitted into the hole, and the other end of which is rotatably fitted into the hole. a crankshaft which projects in the radial direction and has a crank part formed in the middle; a blade fixed to the other end of the crankshaft; , a cylindrical actuating member having an open lower end engaged with the crank portion and an upper surface connected to the lower end surface of the switching operation member via a bearing. An axial flow fan characterized by: