JPH0714449B2 - 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 Generally, 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 must be cleaned frequently. 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. 12 to 14, a large number of cut-and-raised parts 102 are provided in a thin metal plate 101, and 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 part 102 by the inertial action and are collected.
The collection efficiency of oily smoke was high. Also, Figs. 15 to
As shown in Fig. 16, a flat metal plate 105 is provided with a large number of pores 106.
Was provided, and the pores 106 were used as air passages to bend the air flow Z to collect oil smoke (broken line 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 Problem In order to solve this problem, a first means of the present invention is to form a bridge-shaped cut-and-raised part by forming openings on both sides of a flat plate at predetermined intervals and in the plane direction of the flat plate. A plurality of small holes are provided in either or both of the bridge-shaped cut-and-raised portion and the flat surface portion, and openings on both sides of the cut-and-raised portion and the small holes serve as air passages, and the opening of the cut-and-raised portion is provided. A filter for a ventilation device is configured such that the distance between the portion and the outer circumference of the small hole and the distance between the outer circumference of the small hole are both 0.2 to 1.0 mm.

The second means is to raise and lower the bridge by 0.5.
The configuration is ~ 2.0 mm.

By this first means, the air containing oil smoke generated during cooking passes through the opening formed by the bridge-shaped cut-and-raised portion and the small hole as an air passage, but this opening is formed in the plane direction of the flat plate. Due to the presence and small holes, the oil smoke is sufficiently collected on the flat plate due to the inertial collision action. Since the distance between the bridge-shaped cut-and-raised part and the outer periphery of the small hole and the distance between the outer periphery of the small hole are both 0.2 to 1.0 mm, strength is ensured and the opening area of the entire filter is large. The pressure loss is low and the noise is low.

Moreover, since the height of the cut-and-raised portion of the bridge-shaped cut-and-raised portion is set to 0.5 to 2.0 mm by the second means, the oil collecting effect is large and the strength is secured, and the opening area of the entire filter is increased. It can be made large, the pressure loss can be reduced, and the noise can be suppressed.

Embodiment One embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In the figure, 1 is a filter, which is a stainless steel plate having a plate thickness of 0.5 mm, provided with five holes 2 having a hole diameter of 1.2 mm and a hole distance b of 0.5 mm, and holes having a hole diameter of 1.0 mm adjacent to the holes 2 at both ends thereof. 3 is provided for each of the holes 2, openings 4 are formed in the plane direction of the flat plate at positions 0.5 mm on both sides of the holes 2, and a plurality of bridge-shaped cut-and-raised parts 5 are provided at a pitch of 17 mm. Set a hole diameter of 1.2 mm and a hole spacing b on the flat surface between the raised parts 5.
A plane punching portion 7 having a large number of 0.5 mm holes 6 formed continuously is provided. The cut-and-raised parts 5 and the flat punching parts 7 are continuously and alternately located. And
Since the cut-and-raised part 5 is sheared and cut-and-raised,
That is, since the openings 4 are formed on both sides in the plane direction of the flat plate, the openings 4 are not visible when viewed from the front of the front surface of the filter. The distance b between the opening 4 of the cut-and-raised portion 5 and the outer circumference of the small hole 2 and the distance a between the outer circumference of the small hole 2 or the small hole 6 are both 0.5 mm.
The larger this is, the smaller the area of the opening 4 is, the more the pressure loss is increased and the higher the noise is. Conversely, the distance a,
When making b small, it is necessary to consider the strength of that part. The experimental results when the distances a and b are changed are shown in FIG. In the figure, when the distances a and b exceed 1.0 mm, the noise value exceeds 40 phones, but since 40 phones is the upper limit of the allowable noise level of the house under the Noise Regulation Act, the distances a and b are
It must be 1.0 mm or less. Conversely, if a and b are reduced, the noise value tends to decrease, but if it is 0.2 mm or less, the filter strength cannot be secured, and if force is applied or there is processing variation, cracking, deformation, etc. Inconvenience occurs. Therefore, the proper values for the distances a and b are 0.2 to 1.0 mm. A state in which the filter 1 is incorporated in a ventilation fan is shown in FIG. 6. Reference numeral 8 is a frame of the ventilation fan main body, which is equipped with a motor 9 and blades 10 rotated by the motor 9.
A filter 1 held by a filter frame 11 is arranged in front of the blade 10. In the figure, 12 is a motor 9
It is a support member of.

In the above structure, the blades 10 are rotated by the motor 9, and the air containing the pollutants generated during cooking is passed through the filter 1 and discharged to the outside of the room. In the filter 1, the airflow X that has entered the bridge-shaped cut-and-raised part 5 first collides with the front cut-and-raised part 5 and is then divided into left and right parts, passes through the opening 4, and enters the inside of the ventilation fan. This bridge-shaped cut-and-raised part 5 can be seen from the front if the conventional one-end cut-and-raised part is cut and raised.
Oil particles enter the inside of the ventilation fan through the opening, but since the bridge-shaped cut-and-raised portion 5 of the present embodiment is sheared and cut-and-raised, the oil particle always collides with the front cut-and-raised portion 5 by inertia. And then collected. Also, the oil particles contained in the air passing through the holes 2, 3 and 6 have a diameter of 1.0.1.2 m.
Since it is as small as m, it is collected by the inertial collision effect. Furthermore, since the opening 4 of the cut-and-raised portion 5 is on both the left and right sides, the opening can be made larger than the cut-and-raised portion on only one side, and the pressure loss is reduced. Also, small oil particles enter the inside of the ventilation fan without being collected, but the collision with the blades 10 is small and most of them are discharged outside the room, and the ventilation fan main body is very clean. This saves the trouble of cleaning.

Further, since the ventilation passage is formed by both the cut-and-raised part 5 and the holes 2, 3, 6, the pressure loss becomes low and the noise of the ventilation fan becomes low. In addition, since the opening ratio of the holes 2, 3, 6 is not so large, the efficiency of collecting the oil smoke is not so different as compared with the case without the holes.

Next, another embodiment of the present invention will be described with reference to FIGS. In the figure, 21 is a filter, which is provided with five holes 22 each having a hole diameter of 1.2 mm on an aluminum flat plate having a plate thickness of 0.8 mm,
Next to the holes 2 at both ends, one hole 23 having a hole diameter of 1.0 mm is provided,
A large number of cut-and-raised parts 25, which are cut and raised in a bridge shape by 1 mm, are formed on both sides of these holes 22 and 23 in the plane direction of the flat plate at a pitch of 17 mm, and between the cut-and-raised parts 25 adjacent to the opening 24 side. A plane punching section 27 is provided in which a large number of holes 26 having a hole diameter of 1.2 mm are continuously formed in the plane section. The cut-and-raised parts 25 and the flat punching parts 27 are continuously and alternately located. The cut-and-raised height 25 of the cut-and-raised portion 25 is set to 1 mm. If the cut-and-raised height h is lowered, the area of the opening 24 becomes smaller and the oil collecting efficiency is improved.
Pressure loss increases and noise increases. On the contrary, when the height h is increased by cutting and raising the area of the opening 24, the pressure loss decreases and the noise decreases, but the oil collection efficiency decreases,
Further, it is necessary to consider the strength of the cut and raised portion 25.
The experimental results when changing the cutting and raising height h are
As shown in Fig. 11, when the cut-and-raised height h is less than 0.5 mm, the noise value exceeds 40 phons. Therefore, the cut-and-raised height h must be 40 phon or less as described in the first embodiment. Must be 0.5 mm or more. On the other hand, when h is increased, the noise value tends to decrease, but when it exceeds 2.0 mm, the bridge-like cut-and-raised part begins to crack, and processing cannot be performed. Therefore, the cut and raised height h
0.5-2.0mm is an appropriate value.

In addition, although the case where the ventilation fan is used as the ventilation device is shown in the present embodiment, the same effect can be obtained even with the range hood.

EFFECTS OF THE INVENTION As is apparent from the above description of the embodiments, according to the present invention, a filter incorporated in a ventilation device for discharging oil smoke and the like generated by cooking etc. to the outside of the room is provided on a flat plate at predetermined intervals, An opening is formed in the plane direction of the flat plate to provide a bridge-shaped cut-and-raised part, and a large number of small holes are provided in either or both of the bridge part and the flat part.
The distance between the opening of the cut-and-raised part and the outer circumference of the small hole and the distance between the outer circumference of the small hole are both 0.2 to 1.0 mm to ensure strength, and the opening area of the entire filter can be made large, resulting in pressure loss. The effect is low and the noise is low.

Also, the cut-and-raised height of the bridge-shaped cut-and-raised part is 0.
Even if the thickness is set to 5 to 2.0 mm, the strength is ensured and an appropriate opening is formed, so that the pressure loss is low and the noise is low.

[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 sectional view taken along the line CC ′ of FIG. 1, FIG. 5 is a distance-noise value characteristic diagram of the ventilation device filter, and FIG. 6 is a sectional view of a ventilation fan incorporating the ventilation device filter. FIG. 7 is a plan view of a ventilation filter according to another embodiment of the present invention, FIG. 8 is a sectional view taken along the line AA ′ in FIG. 7, and FIG. 9 is a sectional view taken along the line BB ′ in FIG. 7. FIG. 10 is a sectional view taken along the line CC ′ in FIG. 7, FIG. 11 is a cut-and-raised height-noise value characteristic diagram of the cut-and-raised part of the filter for the ventilation system, and FIG. 12 is a conventional filter for the ventilation system. Top view, Fig. 13 shows 12
FIG. 14 is a sectional view taken along the line CC ′ of FIG. 14, FIG. 14 is a sectional view taken along the line DD ′ of FIG. 12, FIG. 15 is a plan view of another conventional filter for a ventilation device, and FIG. 16 is E- of FIG. It is an E'sectional view. 1,21 …… Filter, 2,3,6,22,23,26 …… Small hole, 4,24…
… Aperture, 5,25 …… cut and raised part, 7,27 …… planar punching part.

Claims (2)

[Claims] 1. A flat plate is provided with a predetermined interval, and openings are formed on both sides of the flat plate in the surface direction of the flat plate to provide a bridge-shaped cut-and-raised portion, and either one of the bridge-shaped cut-and-raised portion and the flat surface portion or A large number of small holes are provided on both sides, and the openings on both sides of the cut and raised portion and the small holes are used as ventilation paths, and the distance between the opening of the cut and raised portion and the outer circumference of the small hole and the outer circumference of the small hole. A ventilation filter with a distance of 0.2 to 1.0 mm. 2. A flat plate is formed at predetermined intervals on both sides thereof to form an opening in the plane direction of the flat plate to provide a bridge-shaped cut-and-raised portion, and either one of the bridge-shaped cut-and-raised portion and the flat surface portion or A filter for a ventilator in which a large number of small holes are provided on both sides, the openings on both sides of the cut-and-raised portion and the small holes serve as ventilation paths, and the cut-and-raised height of the cut-and-raised portion is 0.5 to 2.0 mm.