JPS6325471Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a ventilation fan that can extremely easily separate and collect oil in oil smoke generated from a cooking appliance.

Conventionally, as a method for separating and collecting oil in oil smoke, [1] Utility Model Publication No. 13625/1985, a filter was installed in front of the suction port of a ventilation fan, and the oil was sucked in from the suction port by rotating the fan of the ventilation fan. [2] By rotating the fan of the ventilation fan, the oil smoke sucked in from the suction port is passed through an annular filter that surrounds the outer periphery of the fan. Therefore, there are ventilation fans that allow oil to adhere to a filter and separate and collect it.

However, the ventilation fan in [1] with a filter attached to the front of the inlet may cause the filter to become clogged.
Ventilation efficiency decreases, and in addition to the fact that it is not easy to remove oil that adheres to the filter, the oil that accumulates on the filter drips onto the cooking surface.
The drawback is that it is extremely unhygienic.

Furthermore, the ventilation fan in [2] in which a filter is provided on the outer periphery of the fan has the disadvantage that the ventilation efficiency decreases due to the filter becoming clogged, and that it is not easy to remove oil adhering to the filter.

Furthermore, as a device that does not use a filter, in Utility Model Publication No. 55-36756, from the air suction port,
Ventilation fans can be seen that have intricately shaped through holes with cuts, bends, etc. that separate oil from the fan.

However, in ventilation fans that do not use this filter, due to the complicated shape of the holes as mentioned above,
The drawbacks were high air intake resistance, low ventilation efficiency, and high manufacturing costs.

In this invention, a centrifugal fan is rotatably installed in the large-diameter portion of the air guide cylinder, which is a stepped tube with a large diameter on the suction port side and a small diameter on the discharge port side. With this structure, the oil smoke, etc. sucked in from the suction port collides with the inner circumferential surface of the large diameter part, causing the oil content in the oil smoke to adhere to the inner circumferential surface of the large diameter part, and at the same time, the air from which the oil content has been removed is removed. The various drawbacks of the conventional ventilation fans mentioned above are solved by making it possible to separate and collect the oil in the oil smoke very easily by discharging it from the axial outlet at the rear of the fan.

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows a longitudinal side view of the ventilation fan of the present invention,
The air guide cylinder 1, which is the main part of the present invention, has a discharge port side constituted by a small diameter cylinder part 3 having a flange 2 on the front end surface of its base, and a large diameter cylinder having a flange 4 corresponding to the flange 2 on the rear end surface. Overlap both the flanges 2 and 4 on the suction port side that the part 5 constitutes, and screw the screws 6 and 6 together.
..., the small-diameter trunk 3 and the large-diameter trunk 5 are combined, and therefore, a stepped portion 7 is formed at the connecting portion between the small-diameter trunk 3 and the large-diameter trunk 5.

A downwardly sloping opening on the rear end surface of the baffle body 1 serves as a discharge port 8, which is opened and closed as a shutter 9, whose upper end is pivotally mounted 9', rotates.

The opening at the center of the front end surface of the large diameter trunk 5 is a suction port 10 having a smaller diameter than that of the front small diameter trunk, and the peripheral edge of the suction port is bent inward to improve suction efficiency.

The motor 11 is attached to a mounting piece 13 fixed between the inner surfaces facing the mouth end of the small diameter body part 3, and is attached to the free end of a rotating shaft 14 that projects forward from the motor at a predetermined distance from the front end surface of the stepped part 7. A substrate 15 of a centrifugal fan 12 is fixed at an interval "L", and blades 1 having a V-shaped cross section are mounted on the front surface of the substrate so as to face the suction port 10.
6, 16, . . . are erected approximately radially at predetermined intervals.

In the figure, reference numeral 17 indicates an oil cup detachably attached to the bottom of the notch of the large-diameter body 5.

The cross-sectional shape of each of the large and small diameter trunk portions may be circular or square.

Note that the ventilation fan of the present invention is not limited to the above-mentioned embodiment, but as another embodiment, a large-diameter body part may be used as shown in FIGS. The bottom surface of Figure 5 may be bent into sloped parts on both sides and a horizontal part in the center, or the bottom surface of Figures 5 to 6
As shown in the figure, the bottom surface of the large-diameter body portion 5 may be tapered backwards.

The functions of the ventilation fan of the present invention having the above configuration are as follows.

Turn on a switch (not shown), rotate the shutter 9 upward, and rotate the centrifugal fan 12 to suck oily smoke generated from heaters, cookers, etc. into the air guide body 1 through the suction port 10, and the blades 16 ,1
6... applies centrifugal force to the oil smoke while causing the oil smoke to flow out and collide with the inner circumferential surface of the large-diameter body in the radial direction.

The oil smoke that collides with the inner peripheral surface of the large-diameter barrel is separated into oil and exhaust, and the oil adheres to the top and bottom, both sides, and the front of the flange 4 of the inner peripheral surface of the large-diameter barrel, and only the exhaust is exhausted through the stepped portion 7. Then, it is sucked into the small-diameter body narrowed to a small diameter, and is discharged outdoors from the discharge port 8.

In addition, by leaving a distance “L” between the stepped portion,
The oil is reliably shaken off within the large diameter barrel, and the oil adhering to the inner peripheral surface of the large diameter barrel falls to the inner bottom surface of the large diameter barrel due to gravity and is stored in the oil cup 17.

When a considerable amount of oil accumulates in the oil cup,
The oil cup may be removed from the large-diameter body 5 and cleaned, and if the inner circumferential surface of the large-diameter body becomes dirty, the screws 6, 6, . . . may be similarly removed and cleaned as appropriate.

The ventilation fan of the present invention described above has the following effects.

The suction side is formed into a large-diameter body and the discharge side is formed into a small-diameter body and connected to form a stepped wind guide body, which allows air to be sucked in efficiently by a centrifugal fan. The oil in the oil smoke can be reliably separated and collected within the large-diameter body, and only the exhaust air is sent out in the axial direction.Furthermore, there is no need for a filter at all, so there is no reduction in ventilation efficiency due to clogging, resulting in excellent ventilation efficiency, and the oil is removed from the cooking surface. It has extremely excellent practical effects in that it does not drip onto the air, the manufacturing cost is low, and the ventilation fan itself is easy to clean.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of one embodiment of the present invention;
The figure is a partially cutaway front view of Fig. 1, Fig. 3 is a vertical sectional side view of another embodiment of the present invention, and Fig. 4 is the 1 part of Fig. 3.
5 is a longitudinal sectional side view of another embodiment of the present invention, and FIG. 6 is a partially cutaway front view of FIG. 5. DESCRIPTION OF SYMBOLS 1... Air guide cylinder, 3... Small diameter body part, 5... Large diameter body part, 7... Step part, 9... Suction port, 10... Discharge port, 12... Centrifugal fan, L... Predetermined interval.

Claims (1)

[Scope of utility model registration request] In a ventilation fan that exhausts air in the axial direction using a centrifugal fan, the air guide cylinder is formed by a stepped cylinder with a large diameter cylinder on the suction side and a small diameter cylinder on the discharge side, and the fan rotates inside the large diameter cylinder. 1. A ventilation fan characterized in that a mounting board for a centrifugal fan, which is removable, is positioned forward from the stepped portion at a predetermined distance.