JPS6238185Y2 - - 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.

A conventional ventilation fan is shown in Figure 3. A guide plate 7 of a predetermined width is provided on the rotary plate 5 of the impeller 4 at a predetermined interval on the outer end surface of each of the plurality of radially fixed blades 6, and is attached to the inner periphery of the opening of the ventilation fan body 1 on the suction side. The end of each guide plate 7 is made to face the opening 11' of the oil pan 8, and the impeller 4 applies centrifugal force to the oil smoke to cause the oil smoke to collide with the blades 6 and the guide plate 7. , the oil from the oil smoke is attached to the blade 6 and the guide plate 7, and the attached oil is passed along the guide plate to the oil pan 8.
However, among the flow Q of the suction air, the flow Q' toward the back side of the suction port 12 is temporarily stored on the back side of the suction port 12. They collide and are guided to the guide room 13. Therefore, there is a drawback that a pressure loss occurs due to the collision between the outflow air and the inflow air, resulting in a decrease in ventilation efficiency.

In this invention, a through hole that communicates with the suction side is drilled in the oil pan, and through this hole, the flow toward the back side of the suction port.
By refluxing Q' to the suction side, the pressure loss, which is the drawback mentioned above, is reduced.

Next, a downward ventilation fan which is an embodiment of the present invention will be described in detail based on the accompanying drawings.

Fig. 1 shows a vertical front view of the ventilating fan of the present invention, and Fig. 2 shows a bottom view. There is.

A motor 3 is fixed in the upper part of the ventilation fan main body 1, a rotating shaft 3' of the motor 3 is made to project downward, and a rotating plate 5 of an impeller 4 is fixed to this rotating shaft 3'.

The impeller 4 has a plurality of thin plate-like blades 6 radially suspended from the lower surface of the rotary plate 5 at predetermined intervals, and the lower end of the outer end surface of each blade 6 is positioned outward from the outer peripheral edge of the rotary plate 5. In addition, a guide plate 7 of a predetermined width is provided on the inclined outer end surface of each blade 6 so as to extend from the rotary plate 5 and extend and be inclined.

Each of the guide plates 7 has a predetermined gap for air outflow between the guide plates at the outer peripheral end of the impeller 4, and the lower part of the guide plate 7 extends downward from the lower end of the outer end surface of the blade 6.

The oil pan 8 has an outer circumferential surface 9 that can be fitted into and removed from the lower end opening of the ventilation fan main body 1, an inner circumferential surface 10 that serves as an inlet 12 for oil smoke generated from the cooking device, and an annular opening 11'. The opening 11' is a groove frame having an upper surface 11 provided with an opening 11', into which the lower end of each guide plate 7 for guiding oil droplets faces.

The oil receiver 8 is removably attached to the lower end of the ventilation fan main body 1 by screws or recessed/concave fitting.

The through hole 13, which is the main point of the present invention, communicates the lower surface of the ventilation fan main body or the suction port 12 with the oil pan 8, and the suction port 1 formed by the inner peripheral surface of the oil pan 8.
A plurality of pieces are formed at predetermined intervals on the inclined wall 10 or the lower end surface of the oil receiver of No.
4 prevents the oil in the oil pan from escaping.

Note that 15 in the figure indicates a guide chamber that guides the air coming out of the impeller 4 to the discharge port 2.

The operation of the ventilation fan of the present invention configured as above will be explained. Oily smoke etc. generated from the cooking device are sucked in through the suction port 12 and then passed through the rotating rotary plate 5.
Due to the centrifugal force of the blades 6, etc., the flow radially flows toward the outer circumference of the impeller as shown by arrow Q, and some of it flows toward the back side of the suction port as shown by arrow Q'. It collides with the inner surface of the guide plate 7 fixed to. The oil content of the oil smoke that collides with each guide plate 7 is shaken off along the guide plate from the lower end of the guide plate as shown by arrow P in Fig. 1 by being subjected to centrifugal force due to the rotation of the impeller. , is stored in the oil pan 8. The oil pan is removed from the ventilation fan main body at an appropriate time, and the oil stored therein is easily removed.

On the other hand, of the air flow Q, the air flow toward the back side of the suction port, that is, the arrow Q' in FIG.
On the other hand, the air from which oil has been removed passes through the guide chamber 15 in the ventilation fan body 1, passes through the outlet 2, and is discharged outdoors, etc., as shown by the arrow Q in FIG.

The ventilation fan of the present invention is not limited to a downward facing type, but can also be used as a horizontal type.

The ventilation fan of the present invention described above has a guide plate 7 connected to the outer end of each blade so as to face the opening of the oil pan 8 on the inner periphery of the opening, and a through hole 13 communicating with the suction side to the oil pan 8. With a simple configuration that only requires a large number of airflows, a part of the centrifugal airflow Q is diverted to the back of the suction port, Q', and returned to the suction side, thereby making the airflow a steady flow.
This is a highly practical idea that improves ventilation efficiency.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of one embodiment of the ventilation fan of the present invention, and FIG. 2 is a partially cutaway bottom view of FIG. 1.
FIG. 3 is a longitudinal sectional front view of the conventional example. 1... Ventilation fan body, 2... Discharge port, 3... Motor, 4... Impeller, 7... Guide plate, 8... Oil pan,
12...Suction port, 13...Through hole.

Claims (1)

[Scope of utility model registration request] In a ventilation fan comprising an impeller 4 having a plurality of blades 6 protruding radially, a guide plate 7 of a predetermined width is provided protruding from the outer end surface of each blade, and a guide plate 7 is provided along the inner periphery of the opening of the ventilation fan body 1. An oil pan 8 is provided, and the oil pan 8
has an inclined inner peripheral surface forming a suction port 12, and the other surface is bent inward to form an opening 11' on the inner end surface, and the free end of each guide plate faces the opening 11', A ventilation fan characterized in that a plurality of through holes 13 communicating with the suction side are bored in the oil pan 8.