JPS5934823Y2 - ventilation fan - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ventilation fan having a structure that not only has a ventilation function using a fan, a shank, or a bell mouth, but also has an oil sump function using an oil sump.

Conventionally, in ventilation fans, a fan is installed in the ventilation path formed by an outer frame fitted to the ventilation opening, and a shutter is installed on the outside part of the ventilation path to open and close it, and a shutter is installed on the inside part of the ventilation path by external force. A bell mouth which expands toward the front and has an oil guide part with a diameter as straight as possible is provided at the leading edge of the largest diameter, and the bell mouth surrounds the fan, and when the fan is in operation. The oil scattered from the blower blades of the fan is stopped by the bell mouth, and is allowed to flow forward along the expanding surface of the bell mouth, and then guided downward by the oil guide section and installed in the lower part thereof. There are some that are designed to collect oil using a reservoir.

However, in the case of natural products, it has been common practice to make the bell mouth by injecting synthetic resin into a mold, so the oil guide part also needs to be removed from the mold. Therefore, the oil guide portion, which is intended to have a diameter as straight as possible as described above, is actually formed into a tapered shape that widens more or less toward the front.

As a result, the oil flows forward along the slope of the taper of the oil guide section, especially at the bottom, and drops off the oil sump, causing oil droplets to fall into the room and onto the walls and floor. There was a problem of contaminating the etc.

In addition, in a ventilation fan, the shutter rotates upward to open the ventilation passage when the fan is in operation. If the opening is fully opened, there is a risk that rain may enter the room through the ventilation passage, so conventionally the opening limit angle has been kept to about 70 degrees.

However, although the purpose is to prevent rainwater from entering, due to the small opening angle of 70 degrees, the wind resistance caused by the fan, that is, the ventilation resistance, becomes large and the vortices of the air flow are also caused. This has led to problems such as noise generation and decreased ventilation performance.

The present invention was developed in view of the above circumstances, and its main purpose is to be able to reliably introduce oil droplets into the oil sump, reduce noise, and improve ventilation performance. This is a ventilation fan that can be used.

An embodiment of the present invention will be specifically described below with reference to the drawings.

First, in Figure 1, 1 is a ventilation hole formed in the room wall 2,
The indoor area 3 and the outdoor area 4 are communicated with each other.

, 5 is an outer frame that constitutes a ventilation passage fitted into the ventilation opening 1, and has a flange 6 extending outward on the indoor 3 side.

Reference numeral 7 denotes, for example, three shutters whose base ends are rotatably supported in the vertical direction by a pivot 8 on the outdoor 4 side portion of the outer frame 5. By moving the connecting lever 9 up and down, all the shutters 7 are rotated upward at the same time to open and close the ventilation passage through the outer frame 5.

Here, the opening limit angle θ1 of the chanterf is set at 70 to 80 degrees in consideration of the infiltration of rain into the ventilation passage, as described above.

Reference numeral 11 denotes a fan consisting of a motor 12 and a blower blade 14 fitted to a rotating shaft 13 of the motor 12. This fan 11 is mounted on a support 1
5, the shutter 7 is mounted approximately in the center of the outer frame 5 so as to be inclined by an angle θ2, which is an angle as close as possible to the opening limit angle θ1 of the shutter 7, so as to face upward.

Further, in FIG. 2, 16 is a bell mouth which has a cylindrical expanding surface 16a that expands toward the front inside and has a lower part of the outer peripheral edge part 16b wider than the upper part. As shown in FIG. 1, by engaging the engaging portion 6a near the flange 6 of the outer frame 5, the bell mouth 16 is tilted by an angle θ2 similarly to the fan 11, and the bell mouth 16 is moved around the front surface thereof. At the same time, the fan 1 is installed with the decorative frame equivalent part 17 facing upward, and the expansion surface 16a allows the fan 1 to
The air blowing blades 14 are surrounded by the air blowing blades 14 to prevent the pond bed from being scattered from the air blowing blades 14 during ventilation.

Here, the expanded surface 16a also serves to adjust the flow of air during ventilation and improve the efficiency of air blowing.

The bell mouth 16 having such a configuration is made by injecting synthetic resin into a mold together with the oil guide section 18 having a single diameter at the leading edge. The portion 18 is also formed so as to be inclined downwardly at an angle θ3 (θ3<90°-02) as it goes forward, as shown in FIG. 2, for die cutting.

Thus, when the bell mouth 16 is tilted at an angle θ2 as described above, since θ3 is 90°-02, the oil guide portion 18, especially the lower center of the oil guide portion 18, is shown in FIG. As shown in FIG.

Reference numeral 19 denotes a through hole formed across the lower center of the expanded surface 16a of the bell mouth 16 and the lower center of the oil guide section 18;
is an oil sump built into the lower blade portion of the bell mouth 160 so as to face the through hole 19 through the outer peripheral edge 16b of the bell mouth 16.

Next, the operation of the above configuration will be explained.

First, the motor 12 is energized and the shutter 1 is operated in conjunction with the motor 12.
When the air blower blade 14 is rotated at the same time as the opening angle is opened to the opening limit angle θ1, the air in the room 3 containing water vapor, oil smoke, etc. is sucked into the expanded surface 16a of the bell mouth 16, and further the outer frame 5
, through the shank 7, etc., to the outside 4, where ventilation is performed.

During this ventilation, oil droplets adhere to the blower blade 14, and the attached oil droplets are scattered by the blower blade 140 rotations and are received by the bell mouth 16, or the oil droplets adhere directly to the bell mouth 16. Therefore, these oil droplets flow down along the expanded surface 16a of the bell mouth 16 toward the front, that is, toward the interior of the room 3.

At this time, in this embodiment, as described above, by attaching the bell mouth 16 so as to face upward at an angle θ2, the oil guide portion 18 which originally tilts downward sequentially toward the front, that is, toward the interior 3 side, The substantially center of the lower part is sloped downward toward the rear, that is, toward the outdoor 4 side, and as a result, oil droplets that flow down the expanding surface 16a and reach the oil guide part 18 are not allowed to drip into the indoor 3. All of the oil enters the oil reservoir 20 through the through hole 19 and is stored by the oil reservoir 20.

Therefore, unlike in the past, there is no problem of staining the walls, floors, etc. of the room 3.

In this embodiment, not only the bell mouth 16 but also the fan 11 are installed in an inclined state facing upward at an angle θ2, so the inclination of the axis B of the fan 11 is adjusted to the extent that the fan 11 is in the open limit state. The slope can be made close to the slope of the slope line C, so that the ventilation can be made smooth, the ventilation resistance caused by the chanter can be minimized, and the generation of vortices in the airflow can be prevented.

Therefore, unlike the conventional method, noise can be reduced and ventilation performance can be further improved.

In addition, smoke tends to accumulate near the ceiling 21 of the room 3, and it is difficult to remove this trapped smoke using conventional means.
In this regard, in this embodiment, since the fan 11 is tilted upward as described above, the above-mentioned trapped smoke etc. can be reliably discharged to the outside 4.

The present invention is not limited to the embodiments described above and shown in the drawings, but may be implemented with appropriate modifications within the scope of the invention.

As explained above, the present invention includes a fan installed in a ventilation passage, a shutter that rotates upward at a predetermined angle to open the ventilation passage, and a shutter that surrounds the fan and controls the depth of oil scattered by the fan. A bell mouth has an oil guide section that receives the received oil and guides the received oil downward, and an oil sump built into the lower part of the bell mouth so as to collect the oil dripping from the oil guide section. characterized in that the fan and the bell mouth are mounted in an inclined state facing upward at an angle close to the opening limit angle of the shutter,
This allows the oil droplets to be reliably placed in the oil sump,
Furthermore, by reducing noise, ventilation performance can also be improved, and in addition, it is possible to provide an extremely practical ventilation fan that can reliably exhaust smoke trapped near the ceiling. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is an overall longitudinal sectional view, FIG. 2 is an enlarged longitudinal sectional side view of an oil pan, and FIG. 3 is an enlarged longitudinal sectional side view of the vicinity of an oil sump. In the figure, 5 is the outer frame (ventilation path), T is the shutter, 11 is the fan, 12 is the motor, 14 is the blower blade, 16 is the bell mouth, 16a is the expansion surface, 18 is the oil guide, and 20 is the oil sump. ,θ
1 indicates the opening limit angle of the shutter, and θ2 indicates the inclination angle of the fan and oil pan.

Claims (1)

[Scope of utility model registration request] A fan provided in the ventilation passage, a shutter that rotates upward at a predetermined angle to open the ventilation passage, and a fan surrounding LE.
A bell mouth has an oil guide part that receives the depth of oil scattered by the S fan and guides the received oil depth downward, and a receiver collects the oil dripping from the oil guide part in the lower part of this bell mouth. 1. A ventilation fan, characterized in that said fan and bell mouth are mounted in an inclined state facing upward at an angle close to the opening limit angle of said shutter.