JPS6342277Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ventilation fan, and more particularly to a ventilation fan that has improved static pressure characteristics by forming a centrifugal diffuser air passage on the outlet side.

2. Description of the Related Art Conventionally, there is a ventilation fan that ventilates a room by inserting a cylindrical ventilation fan body having a fan and a motor for driving the fan into a ventilation duct vertically embedded in a ceiling surface.

Such conventional ventilation fans have disadvantages in that they have poor static pressure characteristics and a high specific noise level, which is the noise level per unit air volume and unit wind pressure.

Therefore, in view of the above-mentioned conventional circumstances, the present invention has been developed by forming a centrifugal diffuser air path at the outlet of the cylindrical ventilation fan body, thereby converting the velocity energy that was previously wasted into static pressure. To provide a ventilation fan with improved pressure characteristics and reduced specific noise level.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In these figures, 1 is a ceiling plate, and 2 is a ventilation duct, one end of which is vertically attached to an opening 1A of the ceiling plate 1, and the other end led out to the outdoors. The opening end surface of this ventilation duct 2 coincides with the opening 1A surface of the ceiling plate 1 and is open to the interior of the room. 3 is a cylindrical ventilation fan body, 3a is an air outlet, 3b is an inlet, 8
A fan is disposed on the outlet 3a side of the ventilation fan main body 3 so that its front end protrudes to the outside; 6 is a motor for driving the fan 8; and 6 is a motor for driving the fan 8, which is fixed by a mounting leg 7.

The ventilation fan main body 3 is installed inside the duct 2 so that its axial direction coincides with the axial direction of the ventilation duct 2, and the opening end surface of the air outlet 3a is aligned with the opening 1A of the ceiling plate 1.
It is open to the indoor area that matches the surface. Reference numeral 4 denotes a ring-shaped first air passage member that is attached to the opening end of the air outlet 3a of the ventilation fan body 3 and extends from the periphery of the opening end in a plane substantially parallel to the opening surface, and is secured by a wood screw 5. It is fixedly attached to the ceiling plate 1. Reference numeral 9 denotes a disk-shaped second air passage member provided parallel to the first air passage member 4 at a position facing the air outlet 3a, and is formed to have the same outer diameter as the first air passage member 4. and is attached to the first air passage member 4 by the attachment device 13.

This attachment device 13 is attached to the first air path member 4 with a second
The first air passage member 9 is attached so that the mutual interval can be adjusted.
Adjustment screws 10 passed through internally threaded portions 4b provided at a plurality of locations on the air path member 4 and mounting holes 9a provided at positions corresponding to the female threaded portions 4b of the second air path member 9.
and an adjustment screw 10 located between both air passage members 4 and 9.
A compression spring 11 is inserted into the outer periphery. Then, the first and second
A centrifugal diffuser air path 12 communicating with the air outlet 3a is formed by the air path members 4 and 9.

According to this configuration, the centrifugal differential user air path 1
2, the static pressure characteristics are improved and the specific noise level, which is the noise level per unit air volume and unit wind pressure, is reduced, so the noise level in actual use conditions where pressure loss is relatively high is reduced. Also, adjustment screw 1
0, the distance between the first air path member 4 and the second air path member 9 is adjusted, that is, the centrifugal diffuser air path 1
By adjusting to 2, the blowout air volume and wind speed can be freely changed. Furthermore, as shown in FIG. 2, by tilting the second air duct member 9 with respect to the first air duct member 4, the air that had previously been blown out uniformly in the circumferential direction becomes unbalanced, and some The air volume increases in a certain direction, making it possible to easily adjust the installation position of the ventilation fan to efficiently ventilate the entire room.

As explained above, according to the present invention, by providing a centrifugal diffuser air path using the first and second air path members at the outlet of the ventilation fan body, the static pressure characteristics are improved and the noise level is reduced. In addition, by making the interval between the first and second air path members adjustable, the air path can be adjusted and the blowout air volume and wind speed can be freely changed. Further, by tilting the second air path member with respect to the first air path member, the entire room can be efficiently ventilated in accordance with the mounting position of the ventilation fan, which has a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a ventilation fan according to the present invention, in which A is a vertical cross-sectional view, B is a bottom view, and FIG. 2 is a vertical cross-sectional view showing the air passage adjustment state of the ventilation fan. 1...Ceiling board, 1A...Opening, 2...Duct,
3... Ventilation fan main body, 3a... Air outlet, 4... First
Air duct member, 6... motor, 8... fan, 9...
...Second air path member, 10...Adjustment screw, 11...
Compression spring, 12...Centrifugal diffuser air path, 13...Mounting device.

Claims (1)

[Claims for Utility Model Registration] (1) At the opening end of the air outlet of the cylindrical ventilation fan body, which has a fan and a motor for driving the fan installed therein, a A ring-shaped first air duct member extending in the plane is attached, and a ring-shaped first air duct member having substantially the same outer diameter as the first air duct member is attached at a position facing the air outlet, substantially parallel to the first air duct member. A mounting device for installing a second air duct member and attaching the second air duct member to the first air duct member so that the mutual interval can be adjusted, the mounting device comprising: a second air duct member provided at a plurality of locations on the first air duct member; and a compression screw inserted into the outer periphery of the adjustment screw located between both air path members. A ventilation fan characterized by being provided with a mounting device comprising a ring. (2) The ventilation fan according to claim 1 of the utility model registration claim, characterized in that the fan is positioned so as to partially protrude outward from the end surface of the air outlet opening.