JPH0714448B2 - Ventilation filter - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter used in a ventilation device such as a ventilation fan or a range hood that discharges oily smoke generated during cooking to the outside.

2. Description of the Related Art In general, ventilation devices such as ventilation fans and range hoods that discharge oil fumes generated during cooking in the kitchen to prevent indoor air from becoming dirty are heavily contaminated by oil fumes and require frequent cleaning. was there. Further, in order to save the time and labor of this cleaning, a method is used in which a filter is attached to the front surface of the ventilation device to prevent oil stains on the ventilation device main body so as to prevent the ventilation device main body from being soiled. Conventionally, in the case of a structure for collecting oil smoke by utilizing inertial collision as a filter, as shown in FIGS. 6 to 8, a large number of cut-and-raised parts 102 are provided on a thin metal plate 101 to form an opening through which an air flow passes. 103 was used as a ventilation path and the airflow Y was bent to collect oil smoke. In this type of filter, the flow direction of the airflow Y is reliably changed, and the oil particles (broken line arrow in the figure) collide with the cut-and-raised 102 by an inertial action and are collected, so the collection efficiency of oil smoke is high. there were. Further, as shown in FIGS. 9 to 10, a large number of fine holes 106 are provided in a flat metal thin plate 105, and the fine holes 106 are used as an air passage to bend the air flow Z to collect oil smoke. (Dashed arrow in the figure). This type of filter has a large number of pores 106 in the ventilation passage, and a large opening ratio can be obtained, so that the pressure loss of the filter can be suppressed to a low level.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-mentioned conventional filter, in a type in which a large number of cut-and-raised parts 102 are provided in a thin metal plate 101, an opening 1 serving as an air passage is formed.
Since 03 is a cut-and-raised metal thin plate 101, it is not possible to take a large opening 103, and there is a closed hole portion 104 in terms of strength, and since the opening ratio is relatively small, the filter The pressure loss was large, which caused wind noise when passing through the filter and increased noise as the load on the fan of the ventilation system increased. In addition, if the height h of the cut and raised portion is increased by forcibly increasing the aperture ratio, distortion of the substrate is likely to occur during manufacturing, and the action of inertial collision is reduced. Will fall. Further, in the case of a type in which a large number of pores 106 are provided in a flat metal thin film 105, the porosity can be increased to a little over 50%, the pressure loss can be reduced, and when the pore size of the same porosity is large. Compared with the collection efficiency of oil smoke, the thin metal plate 101
It is lower than that of the type in which the cut-and-raised 102 is provided, and when the number of pores is reduced and the opening ratio is reduced in this type, the oil smoke collection efficiency is improved, but the pressure loss increases. I will end up.

The present invention has been made in view of these conventional problems, and an object of the present invention is to provide a filter for a ventilation device, which has a high efficiency of collecting oil smoke, a low pressure loss, and a low noise.

Means for Solving the Problems In order to solve the problem, the present invention provides a bridge-shaped cut-and-raised part by forming openings in the plane direction of the flat plate at predetermined intervals on a flat plate, This is a filter for a ventilation system with a ventilation path.

Operation With this configuration, air containing oil smoke generated during cooking passes through the opening formed by the bridge-shaped cut-and-raised part as an air passage, but since this opening is formed in the plane direction of the flat plate, it causes an inertial collision action. As a result, the oil smoke is sufficiently collected on the flat plate. Further, since the open area ratio can be made large, the pressure loss is low and the noise can be suppressed low.

Embodiment One embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In the figure, reference numeral 1 is a filter, which is a stainless steel plate having a plate thickness of 0.5 mm and is provided with five pores 2a having a hole diameter of 1.2 mm and a hole interval of 1.7 mm, and an opening 4 is formed on both sides of this portion in the plane direction of the plate. A large number of cut-and-raised parts 3 formed by cutting and raising them in a bridge shape with a pitch of 17 mm are provided, and the flat surface between the cut-and-raised parts 3 adjacent to the opening 4 side has a hole diameter of 1.2 mm and a hole interval of 1.7 m.
Flat plate punching part 5 in which a large number of pores 2b are continuously formed at m
Is provided. The cut-and-raised parts 3 and the flat plate punching parts 5 are continuously and alternately located. Since the cut-and-raised portion 3 is sheared and cut-raised, that is, the openings 4 are formed on both sides in the plane direction of the flat plate, the opening 4 is not visible when viewed from the front of the front surface portion. A state in which the filter 1 is incorporated in a ventilation fan is shown in FIG. 5, and 6 is a frame of the ventilation fan main body, which is equipped with a motor 7 and blades 8 rotated by the motor 7. The blade 8
A filter 1 held by a filter frame 9 is disposed in front of the filter. In the figure, 10 is an oil pan, 11 is a shutter, and 12 is a support member for the motor 7.

In the above structure, the blades 8 are rotated by the motor 7 so that air containing contaminants generated by cooking etc. passes through the filter 1 and is discharged to the outside of the room. Filter 1
Flow X that has entered the bridge-shaped cut-and-raised part 3 at
First collides with the cut-and-raised portion 3 on the front side, then is divided into left and right, and penetrates into the inside of the ventilation fan through the opening 4. If the bridge-shaped cut-and-raised portion 3 has a conventional one-side cut-and-raised portion, an opening can be seen when viewed from the front, and therefore oil particles enter the inside of the ventilation fan through the opening. Since the strip-shaped cut-and-raised portion 3 is sheared and cut-and-raised, the oil particles are always collected by colliding with the front cut-and-raised portion 3 by inertia. The oil particles contained in the air passing through the pores 2a and 2b have a pore diameter of 1.2.
Since it is as small as mm, it is collected by the inertial collision effect. Furthermore, since the openings due to cut-and-raised are on the left and right sides, the opening can be made larger than the cut-and-raised on only one side, and the pressure loss is reduced. Also, small oil particles are not collected and follow the airflow and enter the inside of the ventilation fan.
Most of them are discharged outside the room, and the ventilation fan main body is much less contaminated, which saves the trouble of cleaning.

Further, since the ventilation passage is formed by both the cut-and-raised portion 3 and the pores 2a and 2b, the pressure loss becomes low and the noise of the ventilation fan becomes low. Further, since the opening ratio of the pores 2 is not so large, the efficiency of collecting the oil smoke is not so different as compared with the case without the pores.

In this embodiment, the ventilation device is a ventilation fan, but the same effect can be obtained with a range hood.

EFFECTS OF THE INVENTION As is apparent from the above description of the embodiments of the present invention,
A filter incorporated into a ventilation device that discharges oily smoke generated due to cooking etc. to the outside of the room is provided on the flat plate with a predetermined interval, and openings are formed on both sides of the flat plate to provide bridge-shaped cut-and-raised parts, By using this opening as a ventilation path, the air containing oil smoke is bent and passed, so the efficiency of collecting oil smoke is high, and the pressure loss is low.
The effect of reducing noise is obtained.

[Brief description of drawings]

1 is a plan view showing a filter for a ventilation device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA 'in FIG. 1, and FIG. 3 is a sectional view taken along the line BB' in FIG. FIG. 4 is a cross-sectional view taken along the line CC ′ of FIG. 1, FIG. 5 is a cross-sectional view of a ventilation fan incorporating the same ventilation filter, and FIG. 6 is a plan view of a conventional ventilation filter, and FIG. 6 is a sectional view taken along the line CC ′ of FIG. 6, and FIG.
9 is a plan view of another conventional ventilation filter, and FIG. 10 is a sectional view taken along line EE 'of FIG. 1 ... Filter, 3 ... Cut and raised part, 4 ... Opening.

Claims (2)

[Claims] 1. A filter for a ventilation device, wherein openings are formed on both sides of a flat plate in the plane direction of the flat plate at predetermined intervals to provide bridge-shaped cut-and-raised parts, and the openings serve as ventilation paths. 2. A filter for a ventilation device according to claim 1, wherein a large number of small holes are provided in either or both of the bridge-shaped cut-and-raised part and the flat part.