JPS6215716Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a ventilation fan that is connected to a ventilation duct and performs ventilation.

Some ventilation fans have a tapered connection flange that connects to the ventilation duct, and the ventilation duct is connected to this connection flange to perform ventilation, but conventionally, ventilation with a small duct diameter was used as a standard when the ventilation air volume was small. A connecting flange was installed that could be connected to the duct. When it is necessary to increase the ventilation air volume with such conventional ventilation fans,
Although ventilation ducts with large duct diameters are connected, the connection flange itself is narrowed for use with small duct diameters, resulting in a large pressure loss and a reduction in ventilation airflow. Furthermore, even when connecting a ventilation duct with a small diameter, the connection flange is narrowed at a steep angle, resulting in a large pressure loss.

The present invention was made to eliminate the drawbacks of the conventional ones as described above, and by providing a disconnection part so that the connecting flange can be separated according to the duct diameter, it is possible to create a ventilation fan that can reduce pressure loss. is intended to provide.

FIG. 1a is a vertical sectional view showing an embodiment of the present invention, and FIG. 1b is a perspective view of a connecting flange. In the figure, 1 is a ceiling, 2 is a field edge, and a ventilation fan main body 3 is screwed to reinforce the ceiling.
Reference numeral 4 denotes a decorative grille, which is connected to the ventilation fan main body 3 through mounting screws 5 and fixed to one side of the ceiling. Number 6 is the orifice, which serves to smooth the flow of air. Reference numeral 7 denotes a drive motor that rotationally drives the blower blade 8 to perform ventilation, and also drives the orifice 6.
It is fixed with mounting feet 9. Reference numeral 10 denotes a tapered connecting flange of the present invention, which has a slit 10a approximately in the center of the tapered shape so that the connecting flange 10 can be easily separated into circular slices. 11 is a ventilation duct.

In the ventilation fan configured as described above, when the ventilation air volume may be small, for example, when the ventilation duct is short and the pressure loss is small, ventilation is performed by connecting the ventilation duct 11 to the connection flange 10 as shown by the solid line. When it is necessary to increase the ventilation air volume and want to reduce the pressure loss due to the ventilation duct, the slit 10 provided on the connection flange 10
Separate the connecting flange 10 into circular slices by a,
Connect the ventilation duct 12 as shown by the chain line. This increases the opening area of the connection flange 10 and reduces pressure loss, thereby making it possible to reduce the decrease in ventilation air volume. Further, even when ventilation is performed through the ventilation duct 11 as described above, the taper part is made longer than the connection flange that fits the conventional ventilation duct 11, and the opening area can be gradually narrowed, so that pressure loss is reduced. By having a connection flange as in the present invention,
More effective ventilation becomes possible.

FIG. 2a is a vertical sectional view of a connecting flange in another embodiment, and FIG. 2b is a perspective view thereof, in which the connecting flange 10 is divided into two parts approximately at the center, and is removably joined by screws 13 in an overlapping state. . If they are joined in such a way that they can be easily separated, the reduction ratio may be small in terms of manufacturing, and manufacturing becomes easy.

Note that the separation portion of the connection flange 10 may be of any type as long as it can be easily separated, and other structures may be adopted. Furthermore, the structure, mounting position, etc. of the ventilation fan body are not limited to those of the above embodiments.

As described above, according to the present invention, since a separation part is provided that can separate the connecting flange into circular slices,
The connecting flange can be separated according to the duct diameter, the diameter can be adjusted to match the duct diameter, and pressure loss can be reduced. Furthermore, even when the duct diameter is small, the constriction angle of the connecting flange can be made small, so pressure loss can be similarly reduced.

[Brief explanation of the drawing]

Figure 1a is a vertical sectional view showing one embodiment of the present invention, b is a perspective view of a connecting flange, and Figure 2a is a vertical sectional view showing a connecting flange in another embodiment;
b is a perspective view thereof. In each figure, the same reference numerals indicate the same or equivalent parts, 1 is the ceiling, 2 is the roof edge, 3 is the ventilation fan body, 4 is the decorative grill, 5 is the mounting screw, 6 is the orifice, 7
is the drive motor, 8 is the blower blade, 9 is the mounting foot, 1
0 is the connection flange, 10a is the slit, 11,1
2 is a ventilation duct.

Claims (1)

[Claims for Utility Model Registration] (1) In a ventilation fan that has a connecting flange and connects a ventilation duct to the connecting flange for ventilation,
A ventilation fan characterized in that the connecting flange has a tapered shape, and a separating portion is provided in the intermediate portion of the tapered shape so that the connecting flange can be separated into rings. (2) The ventilation fan according to claim 1, wherein the separation portion is provided approximately at the center of the tapered connection flange. (3) The ventilation fan according to claim 1 or 2 of the utility model registration claim, wherein the separation portion is a slit. (4) The ventilation fan according to claim 1 or 2 of the utility model registration claim, characterized in that the separated portions are removably joined in a polymerized state.