JPH0330743Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a large industrial ventilation fan used in factories, warehouses, etc.

BACKGROUND TECHNIQUES Conventionally, large industrial ventilation fans have been required to have a structure that allows the direction of airflow to be changed during installation, such as for exhausting or supplying air. For this purpose, as shown in FIG. 3, for example, in this type of ventilation fan, a spacer 104 is fitted onto the shaft 102 of an electric motor 101, one end of which is brought into contact with the inner ring of a ball bearing 103, and the other end is brought into contact with a blade 106. The structure is such that the blades 106 are fixed by tightening a nut 105 to a threaded part machined at the tip of the shaft 102, and the blades 106 can be fixed according to the desired direction of airflow.
6 was selected, and the rotation direction of the electric motor 101 was selected.

Problems to be Solved by the Invention In the conventional ventilation fan, depending on the twist height dimension of the blades, the blades 106 may
Although the blades 106 do not protrude from the end face of the frame 107 of the ventilation fan, there is a problem in that the blades 106 protrude greatly from the frame 107 in the other mounting and fixing direction.

The present invention takes into consideration the above-mentioned conventional problems and prevents the blades from flying out from the frame of the ventilation fan even if the direction in which the blades are attached and fixed is changed.

Means for Solving the Problem In order to solve this problem, the present invention includes a blade that changes its mounting direction depending on the direction in which the wind is sent, an electric motor that drives this blade, and a support that supports this electric motor. , and a frame body to which the support body is fixed and the ventilation fan body is fixed to the wall surface;
Depending on the mounting direction of the blades, two tubular spacers are fitted in series or fitted to sandwich the blade boss.

Function The ventilation fan with the above configuration has two
By positioning and fixing the blades by placing two tubular spacers adjacent in series or by sandwiching the blade boss, it is possible to prevent the blades from protruding from the end face of the ventilation fan frame. It becomes possible.

Embodiment An embodiment of the present invention will be described below based on FIGS. 1 and 2.

In the figure, an electric motor 2 for driving blades 1 fixed to a shaft 5 for blowing air is fixed via a support 3 to a frame 4 that fixes the ventilation fan main body to a wall surface.

Tubular spacers 6 and 7 for positioning the blade 1 are fitted into the shaft 5 of the electric motor 2, and the tubular spacers 6 and 7 have the same inner diameter. The blade 1 is composed of a blade boss 8 for fitting with the shaft 5, a blade plate 9 for sending air, and a blade hub 10 for joining the blade boss 8 and the blade plate 9.

When the direction of airflow is from the electric motor 2 side to the frame 4, the tubular spacer 7, the tubular spacer 6, and the vane boss 8 are constructed in this order from the side of the shaft 5 closest to the electric motor 2 as shown in FIG. The second side is positioned by a ball bearing 11 press-fitted into the shaft 5, and the blade 1 is positioned and fixed by tightening a nut 12 to a threaded part machined at the tip of the shaft 5 on the side opposite to the motor.

When the direction of airflow is from the frame 4 to the electric motor 2, the tubular spacer 7, the vane boss 8, and the tubular spacer 6 are arranged in this order from the side of the shaft 5 closest to the electric motor 2 as shown in FIG. Fix the blade 1 in the same way. At this time, the blade 1 is attached and fixed in the opposite direction to that shown in FIG. Further, the rotation direction of the electric motor 2 at this time is opposite to that in FIG. 1.

In this way, the position of the blade can be adjusted by selecting the position of the tubular spacer according to the direction of the blade.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, in order to select the direction of airflow, not only the direction of the blades and the direction of rotation of the electric motor are selected, but also the position of the blades is adjusted using the tubular spacer. By doing so, it is possible to prevent the blades from flying out from the main body frame.

[Brief explanation of the drawing]

1 and 2 are side views showing a ventilation fan according to an embodiment of the present invention, and FIG. 3 is a side view showing a conventional ventilation fan. 1...Blade, 2...Electric motor, 3...Support, 4
... Frame body, 5 ... Shaft, 6 ... Tubular spacer, 7 ...
...Tubular spacer.

Claims (1)

[Scope of utility model registration request] The ventilation fan has a blade that changes its installation direction depending on the direction in which the air is sent, an electric motor that drives the blade, a support that supports the electric motor, and a frame that fixes the support and fixes the ventilation fan body to the wall. and a ventilation fan in which two tubular spacers are fitted to the shaft of the electric motor in series depending on the mounting direction of the blades, or fitted to sandwich the blade bosses.