CN210461196U

CN210461196U - Ventilation filter and ventilation fan

Info

Publication number: CN210461196U
Application number: CN201920452369.4U
Authority: CN
Inventors: 铃木亮太; 寺崎弘幸
Original assignee: Toshiba Carrier Corp
Current assignee: Toshiba Carrier Corp
Priority date: 2018-06-26
Filing date: 2019-04-04
Publication date: 2020-05-05
Anticipated expiration: 2029-04-04
Also published as: JP2020003106A; JP7130464B2

Abstract

An object of the utility model is to provide a filter for taking a breath and have this scavenger fan of filter for taking a breath. The ventilation filter is provided with: a frame body having left and right longitudinal frame portions, an upper frame portion, and a lower frame portion; a filter material fixed to the frame so as to cover a region surrounded by the vertical frame portion, the upper frame portion, and the lower frame portion; and an oil recovery tank provided in the lower frame portion of the frame body and receiving oil that slides down the surface of the filter material. The frame body has left and right corner portions defined by the vertical frame portion and the lower frame portion, and the oil recovery groove is located between the corner portions. A rising wall is provided at the corner portion, which is in contact with the filter medium and stands up so as to connect the lower end portion of the vertical frame portion and the end portion of the lower frame portion, and a guide surface that becomes lower from the vertical frame portion toward the oil recovery tank is formed at the upper end of the rising wall. The end of the guide surface on the lower frame side is located at the same position as the position of the both ends of the oil recovery groove or at a position closer to the center of the oil recovery groove than the position of the both ends of the oil recovery groove.

Description

Ventilation filter and ventilation fan

Technical Field

The present invention relates to a ventilation filter for trapping dust containing oil in air and a ventilation fan having the ventilation filter.

Background

For example, a general ventilation fan used in a kitchen includes a ventilation filter for preventing oil smoke generated during cooking from entering the inside of a ventilation fan main body. Such a ventilation filter is mainly a disposable filter that is not cleaned and is composed of a sheet-like filter material that absorbs oil contained in soot and a frame that surrounds and supports the filter material.

The frame body has left and right vertical frame portions standing at intervals, an upper frame portion spanning between upper ends of the vertical frame portions, and a lower frame portion spanning between lower ends of the vertical frame portions, and an oil recovery groove is formed in an upper surface of the lower frame portion. The oil recovery groove extends in the longitudinal direction of the lower frame portion, and is positioned between left and right corner portions defined by the lower ends of the left and right vertical frame portions and the two ends of the lower frame portion.

According to the conventional ventilation fan, the mist-like oil adhering to the surface of the filter material grows into particles as the operation time passes, and finally slides down along the surface of the filter material based on the weight of the oil. The oil component sliding down the surface of the filter material reaches the lower frame portion of the frame body and is recovered in an oil recovery groove provided in the lower frame portion.

Further, the mist oil adheres not only to the filter material but also to the frame. The oil adhered to the frame body slides down along the vertical frame portion and is guided from the corner portion of the frame body to the oil recovery tank.

Patent document 1: japanese Kokai publication Sho-64-16538

Patent document 2: japanese patent laid-open No. 2000-70634

In a conventional ventilation fan, right and left corner portions of a housing have an angular shape. Therefore, the oil tends to be retained in the corner portion, and the retained oil is easily solidified in the corner portion. Further, since the oil recovery groove is located between the right and left corner portions and the oil recovery groove are separated from each other, the oil component that has reached the corner portions may not be guided to the oil recovery groove and may flow out of the lower end of the frame toward the outside of the frame. In particular, when a solid substance composed of an oil mass exists in the corner portion, the solid substance obstructs the flow of the oil or the oil inevitably flows in an unspecified direction.

As a result, oil that slides down the vertical frame part drops from the lower end of the frame body, and this causes the wall or floor of the kitchen to be stained.

Disclosure of Invention

An object of the utility model is to provide a can accurately guide the oil content of following the landing of the vertical frame portion of framework to the filter for taking a breath in the oil recovery groove.

According to an embodiment, a ventilation filter includes: a frame body having left and right vertical frame portions standing at an interval from each other, an upper frame portion spanning between upper ends of the vertical frame portions, and a lower frame portion spanning between lower ends of the vertical frame portions; a filter material that is fixed to the frame so as to cover a region surrounded by the vertical frame portion, the upper frame portion, and the lower frame portion, and that captures oil-containing dust in air; and an oil recovery groove provided in the lower frame portion of the frame body and receiving oil components sliding down along the surface of the filter material.

The frame body has left and right corner portions defined by the vertical frame portion and the lower frame portion, and the oil recovery groove is located between the corner portions. In addition, a rising wall that is in contact with the filter medium and stands so as to connect between a lower end of the vertical frame portion and an end of the lower frame portion is provided at the corner portion, and a guide surface that becomes lower as it goes from the vertical frame portion toward the oil recovery groove is formed at an upper end of the rising wall. The end portion of the guide surface on the lower frame portion side is located at the same position as the position of the both end portions of the oil recovery groove or located closer to the center of the oil recovery groove than the position of the both end portions of the oil recovery groove.

In the ventilation filter, the guide surface of the standing wall has a shape curved downward in an arc shape.

In the above ventilation filter, the corner portion of the frame body further includes a curved surface that connects the lower end portion of the vertical frame portion and the end portion of the lower frame portion and is curved in an arc shape, and the curved surface is located on the opposite side of the standing wall from the filter material.

In the ventilation filter, the frame is detachably supported by the ventilation fan main body so as to cover the suction side of the ventilation fan main body having the impeller, and the filter material is fixed to the frame so as to protrude in a direction away from the ventilation fan main body.

In the ventilation filter, the frame body includes a plurality of horizontal bar portions that connect the vertical frame portions to each other and are arranged at intervals in a longitudinal direction of the vertical frame portion, the horizontal bar portions support the filter material in a region surrounded by the vertical frame portion, the upper frame portion, and the lower frame portion, and a surface of the vertical frame portion of the frame body on a side opposite to a surface supported by the ventilation fan body has a shape protruding in a direction away from the ventilation fan body.

In the ventilation filter, the housing includes: at least one vertical bar portion that stands so as to connect a middle portion in the longitudinal direction of the upper frame portion and a middle portion in the longitudinal direction of the lower frame portion; and a plurality of horizontal bars that are arranged in a region surrounded by the vertical frame portion, the upper frame portion, and the lower frame portion so as to intersect with the vertical bar portion, and that support the filter material in a region surrounded by the vertical frame portion, the upper frame portion, and the lower frame portion as they tilt downward toward the vertical bar portion, the frame body having the vertical bars and the horizontal bars being detachably supported by the ventilation fan main body so as to cover an air suction side of the ventilation fan main body having the impeller, the vertical bars and the horizontal bars having a shape that protrudes in a direction away from the ventilation fan main body.

In the above-described filter for ventilation, the frame body is made of a synthetic resin material, the vertical frame portion of the frame body has an outer peripheral wall extending in a depth direction of the frame body, and a bending scheduled portion having a notch opening at an end edge of the outer peripheral wall and a first groove formed on an inner surface of the outer peripheral wall continuously from the notch is provided at least one portion of the outer peripheral wall corresponding to a middle portion in a longitudinal direction of the vertical frame portion, the first groove extending in the depth direction of the frame body.

In the ventilation filter, the frame body further includes an inner peripheral wall facing the outer peripheral wall of the vertical frame portion, and a second groove facing the first groove is formed in an inner surface of the inner peripheral wall.

In the ventilation filter, the outer peripheral wall of the vertical frame portion of the frame body is inclined in a direction in which the outer peripheral wall approaches the ventilation fan body as the outer peripheral wall moves away from the ventilation fan body, and a step is provided in a middle portion of the outer peripheral wall in the depth direction of the frame body.

According to an embodiment, the ventilation fan includes: a ventilator main body having an impeller capable of sucking air; the ventilation filter is detachably supported by the ventilation fan main body and covers the air suction side of the ventilation fan main body.

Drawings

Fig. 1 is a front view of a ventilation fan according to a first embodiment.

Fig. 2 is an exploded perspective view illustrating the ventilation fan according to the first embodiment.

Fig. 3 is a perspective view of the ventilation filter according to the first embodiment when viewed from the rear side.

Fig. 4 is an enlarged perspective view at F4 in fig. 2.

Fig. 5 is a rear view of the ventilation filter according to the first embodiment when viewed from the rear side.

Fig. 6 is a sectional view taken along line F6-F6 of fig. 5.

Fig. 7 is an enlarged rear view at F7 in fig. 5.

Fig. 8 is a sectional view taken along line F8-F8 of fig. 7.

Fig. 9(a) is a perspective view showing a state in which the ventilation filter is folded at the incision position.

Fig. 9(B) is a perspective view showing a state in which the ventilation filter is folded to half-size.

Fig. 10 is a perspective view of a ventilation filter according to a second embodiment.

Fig. 11 is an enlarged perspective view at F11 in fig. 10.

Fig. 12 is a perspective view of a ventilation filter according to a third embodiment.

Fig. 13 is a sectional view of a ventilation filter according to a third embodiment.

Fig. 14 is a cross-sectional view showing a state in which a plurality of ventilation filters according to the third embodiment are stacked and packed.

In the figure: 1-ventilator, 2-ventilator body, 4-impeller, 5-ventilator filter, 12-frame, 13-filter material, 15a, 15 b-longitudinal frame, 16-upper frame, 17-lower frame, 24a, 24 b-corner, 25-oil recovery tank, 27-vertical wall, 28-guide surface, 28 a-end.

Detailed Description

(first embodiment)

Hereinafter, the first embodiment will be described with reference to fig. 1 to 9 (B).

Fig. 1 is a front view of a general ventilation fan 1 used in, for example, a kitchen, and fig. 2 is an exploded perspective view of the ventilation fan 1. As shown in fig. 1 and 2, the ventilation fan 1 mainly includes a ventilation fan main body 2, a motor 3, an impeller 4, and a disposable ventilation filter 5.

The ventilator body 2 is mounted on the wall surface of the kitchen. The ventilation fan main body 2 is mainly composed of a cylindrical air outlet pipe (bellmouth)6 penetrating through an air outlet opening on a kitchen wall surface and a square front panel 7 integrally formed with the air outlet pipe 6. The front panel 7 is exposed to the room from the wall surface of the kitchen, and has a circular suction port 8 communicating with the air outlet duct 6.

The motor 3 is supported by the ventilator main body 2. The rotary shaft 3a of the motor 3 is disposed coaxially with the air outlet duct 6. The impeller 4 includes a boss portion 9 connected to the rotary shaft 3a of the motor 3, and a plurality of blades 10 provided on an outer peripheral surface of the boss portion 9. The impeller 4 is disposed inside the air outlet duct 6 so as to face the air inlet 8.

When the motor 3 is started to rotate the impeller 4, negative pressure acts on the air inlet 8, and the air in the room in the kitchen is sucked into the ventilation fan main body 2 through the air inlet 8. The air sucked into the ventilator body 2 is discharged to the outside of the kitchen through the ventilator body 2.

The ventilation filter 5 is a component for preventing oil in oil smoke generated in a kitchen during cooking from being sucked into the suction port 8 of the ventilation fan main body 2, for example, and is detachably supported by the front panel 7 of the ventilation fan main body 2 so as to cover the suction port 8 from the indoor side. The soot is an example of dust containing oil in the air, and may be mixed with fine particles such as powder in addition to the oil.

As shown in fig. 2 to 6, the ventilation filter 5 is mainly composed of a frame 12 and a filter material 13 for trapping oil in soot.

The frame 12 is made of a synthetic resin material such as ABS resin, and has a square shape conforming to the shape of the front panel 7. Specifically, the housing 12 includes: left and right

vertical frame portions

15a, 15b standing at a distance from each other; a horizontal upper frame portion 16 spanning between upper ends of the

vertical frame portions

15a, 15 b; a horizontal lower frame portion 17 spanning between the lower ends of the

vertical frame portions

15a, 15 b; and a plurality of horizontal bars 18 extending between the upper frame portion 16 and the lower frame portion 17 and between the

vertical frame portions

15a and 15 b.

As shown in fig. 3, 5, and 6, the vertical frame portion 15a, the vertical frame portion 15b, the upper frame portion 16, and the lower frame portion 17 each have an outer peripheral wall 20, an inner peripheral wall 21, and a front wall 22. The outer peripheral wall 20 and the inner peripheral wall 21 extend in the depth direction of the housing 12, and the outer peripheral wall 20 and the inner peripheral wall 21 face each other with a slight gap therebetween. The vertical frame portion 15a, the vertical frame portion 15b, the upper frame portion 16, and the outer peripheral wall 20 of the lower frame portion 17 are continuously formed in the circumferential direction of the frame body 12. Similarly, the inner peripheral walls 21 of the vertical frame portion 15a, the vertical frame portion 15b, the upper frame portion 16, and the lower frame portion 17 are also continuously formed in the circumferential direction of the frame body 12.

The front wall 22 extends between the front end edge of the outer peripheral wall 20 and the front end edge of the inner peripheral wall 21 on the indoor side of the kitchen, and is formed continuously in the circumferential direction of the frame 12. Therefore, the front wall 22 is exposed to the room of the kitchen in a state of surrounding the inner peripheral wall 21 continuous in the circumferential direction of the frame 12 with a width of several millimeters.

As shown in fig. 6, the length of the outer peripheral wall 20 in the depth direction of the housing 12 is set to be greater than the length of the inner peripheral wall 21 in the depth direction of the housing 12. Therefore, the outer peripheral wall 20 surrounds the inner peripheral wall 21 over the entire periphery of the housing 12, and the edge on the side opposite to the front wall 22 is abutted against the outer peripheral portion of the front panel 7.

According to the present embodiment, the

vertical frame portions

15a and 15b of the frame body 12 have a shape curved in an arc shape so that the front end portions thereof on the side opposite to the front panel 7 protrude toward the inside of the kitchen. Therefore, the center portion of the housing 12 in the height direction is further from the front panel 7 than the upper end portion and the lower end portion of the housing 12.

The plurality of horizontal bars 18 are arranged in parallel with each other with a space therebetween in the longitudinal direction of the

vertical frame portions

15a and 15 b. Both ends of the horizontal bar portion 18 in the longitudinal direction are in contact with the inner peripheral wall 21 of the

vertical frame portions

15a and 15b and are formed integrally with the inner peripheral wall 21. The horizontal bar portions 18 are disposed so as to correspond to the curved shapes of the

vertical frame portions

15a and 15b, that is, the horizontal bar portions 18 closer to the central portions of the

vertical frame portions

15a and 15b are farther from the front panel 7 of the ventilation fan main body 2.

The filter material 13 is made of, for example, a sheet-like nonwoven fabric. The nonwoven fabric has a property of absorbing oil contained in soot, and the outer peripheral edge portion thereof is fixed to the inner peripheral wall 21 of the frame 12 and the edge portion of the horizontal strip portion 18 by, for example, heat welding or the like.

Therefore, the filter material 13 is a structure integrated with the frame body 12, and covers the entire surface of the frame body 12 in a region surrounded by the vertical frame portion 15a, the vertical frame portion 15b, the upper frame portion 16, and the lower frame portion 17.

As shown in fig. 2 and 4, the lower end portions of the inner peripheral walls 21 of the

vertical frame portions

15a, 15b intersect with both end portions of the inner peripheral wall 21 of the lower frame portion 17 in the longitudinal direction at the lower end of the frame body 12, and cooperate with each other to define left and

right corner portions

24a, 24 b. The

corner portions

24a and 24b are located further toward the indoor side of the kitchen than the filter material 13.

The lower frame portion 17 of the frame 12 is provided with an oil recovery tank 25. The oil recovery groove 25 extends in the longitudinal direction of the lower frame portion 17 between the

corner portions

24a and 24b of the frame 12. The oil recovery groove 25 is open to the inner peripheral wall 21 of the lower frame portion 17 for defining the upper surface of the lower frame portion 17 in front of the lower end portion of the filter medium 13. The inner peripheral wall 21 is inclined downward from the filter material 13 toward the oil recovery groove 15.

According to the present embodiment, the extension portions 25a are formed at both ends of the oil recovery groove 25 in the longitudinal direction. In fig. 4, only one of the extension portions 25a is shown as a representative example, and as shown in fig. 4, the extension portion 25a is a slit-shaped element having a width smaller than the width of the main portion of the oil recovery groove 25, and extends toward the corner portion 24 a.

As shown in fig. 1, 2, and 4, a rising wall 27 is provided at each of the

corner portions

24a and 24b of the housing 12. The rising wall 27 is a rib-arch-shaped element that stands to connect the lower end portions of the inner peripheral walls 21 of the

vertical frame portions

15a, 15b and both end portions of the inner peripheral wall 21 of the lower frame portion 17 in the longitudinal direction, and the extension portion 25a of the oil recovery groove 25 is located in front of the rising wall 27. The filter material 13 is in contact with the surface of the rising wall 27 on the side opposite to the extension portion 25a of the oil recovery groove 25.

A guide surface 28 is formed at the upper end edge of the rising wall 27. The end 28a of the guide surface 28 on the lower frame portion 17 side is located at the same position as the position of both ends of the oil recovery groove 25 or located closer to the center of the oil recovery groove 25 than the position of both ends of the oil recovery groove 25. The guide surface 28 is curved in an arc shape so as to become lower from the inner peripheral wall 21 of the

vertical frame portions

15a and 15b toward the oil recovery groove 25.

As shown in fig. 1 and 4, curved surfaces 29 are formed at the

corner portions

24a and 24b of the frame 12, respectively. The curved surface 29 connects the lower end portions of the inner peripheral walls 21 of the

vertical frame portions

15a, 15b and the both end portions of the inner peripheral wall 21 of the lower frame portion 17 in the longitudinal direction, and is curved in an arc shape so as to become lower from the

vertical frame portions

15a, 15b toward the lower frame portion 17.

The curved surface 29 is located on the opposite side of the rising wall 27 from the filter material 13. Therefore, the oil recovery groove 25 formed in the lower frame portion 17 is positioned between the curved surfaces 29 included in the

corner portions

24a and 24b, and the lower end of the curved surface 29 continuous with the lower frame portion 17 faces both end portions in the longitudinal direction of the oil recovery groove 25. The extension 25a of the oil recovery groove 25 is located between the rising wall 27 and the curved surface 29.

As shown in fig. 2 and 3, the upper frame portion 16 of the frame 12 has a pair of

engagement holes

31a and 31 b. The engaging

holes

31a and 31b are arranged at intervals in the longitudinal direction of the upper frame portion 16. A pair of locking

pieces

32a and 32b are formed on the lower frame 17 of the frame body 12. The locking

pieces

32a and 32b are arranged at intervals in the longitudinal direction of the lower frame 17 and project toward the rear side of the lower frame 17.

According to the present embodiment, the ventilation filter 5 is detachably supported by the front panel 7 by engaging the pair of engaging

claws

33a and 33b protruding from the upper edge of the front panel 7 with the engaging

holes

31a and 31b of the upper frame portion 16 and fitting the

engaging pieces

32a and 32b of the lower frame portion 17 into the

fitting holes

34a and 34b opened in the lower edge of the front panel 7.

In a state where the ventilation filter 5 is attached to the front panel 7, the filter material 13 faces the air inlet 8 of the ventilation fan main body 2. Further, since the

vertical frame portions

15a and 15b of the frame 12 are curved in an arc shape so that the front end portions thereof on the side opposite to the front panel 7 protrude toward the inside of the kitchen, even if the filter medium 13 thermally welded to the frame 12 is used, the central portion thereof is separated from the air inlet 8.

Therefore, the central portion of the filter material 13 is farther from the inlet port 8 than the outer peripheral edge portion of the filter material 13, and a sufficient air intake space is ensured between the central portion of the filter material 13 and the inlet port 8.

Therefore, when the impeller 4 rotates, the impeller 4 sucks air from the air suction space, and therefore, although the air suction port 8 is covered with the ventilation filter 5, the ventilation resistance can be suppressed to be small. At the same time, since the central portion of the filter material 13 is distant from the impeller 4, the filter material 13 is less likely to be entrained by the rotating impeller 4.

Furthermore, by bending the

vertical frame portions

15a and 15b, the surface area of the filter material 13 can be increased, and the pressure loss acting on the ventilation fan 1 can be reduced.

On the other hand, in the ventilation filter 5 of the present embodiment, the portions to be bent 36 are provided at one portion of the intermediate portions of the

vertical frame portions

15a and 15b of the frame 12 in the longitudinal direction. Fig. 7 and 8 show the portion to be bent 36 provided in the one vertical frame portion 15 a. The portion to be bent 36 is composed of a fine notch 37, a first groove 38a, a second groove 38b, and a third groove 38 c.

The notch 37 is a component of a mark indicating a bending position of the frame 12, and is opened at an end edge of the outer peripheral wall 20 of the

vertical frame portions

15a and 15b abutting against the front panel 7. The cutout 37 preferably has a V-shaped opening shape, for example.

The first groove 38a is formed continuously with the notch 37 and on the inner surface of the outer peripheral wall 20, and extends straight in the depth direction of the frame 12.

The second groove 38b is formed on the inner surface of the inner peripheral wall 21 of the

vertical frame portions

15a and 15 b. The second groove 38b extends straight in the depth direction of the frame 12 and faces the first groove 38 a.

The third groove 38c is formed in the inner surface of the front wall 22 of the

vertical frame portions

15a and 15 b. The third groove 38c extends straight in the width direction of the frame 12 so as to connect one end of the first groove 38a and one end of the second groove 38 b.

The first groove 38a, the second groove 38b, and the third groove 38c preferably have a V-shaped cross-sectional shape as shown in fig. 7 and 8, for example.

In the ventilation fan 1 configured as described above, when the impeller 4 rotates in response to the activation of the motor 3, for example, soot generated in a kitchen during cooking passes through the filter material 13 of the ventilation filter 5 and is sucked into the air inlet 8 of the ventilation fan main body 2. The mist-like oil contained in the soot is absorbed by the filter material 13 and adheres to the surface of the filter material 13. The oil adhering to the surface of the filter material 13 grows into particles as the operating time of the ventilation fan 1 elapses, and finally slides down the surface of the filter material 13 based on its own weight.

The oil component sliding down the surface of the filter material 13 reaches the lower frame portion 17 of the frame 12 over the horizontal portion 18, and flows toward the oil recovery groove 25 along the inclination of the inner peripheral wall 21 of the lower frame portion 17. Therefore, most of the oil sliding down the surface of the filter medium 13 is received by the oil recovery groove 25, and is recovered in the oil recovery groove 25 without dropping to the outside of the ventilation fan 1.

On the other hand, oil contained in the soot also adheres to the frame 12 surrounding the filter material 13. A part of the oil adhered to the frame 12 slides down the

vertical frame parts

15a and 15b and reaches the left and

right corner parts

24a and 24 b.

In particular, since the inner peripheral wall 21 of the housing 12 is adjacent to the filter medium 13 that absorbs oil, oil contained in the soot is likely to adhere to the inner peripheral wall 21. The oil adhered to the inner peripheral walls 21 of the

vertical frames

15a and 15b slides down by its own weight and flows to the

corner portions

24a and 24 b.

In the present embodiment, a rib-arch-shaped rising wall 27 that stands so as to connect the inner peripheral walls 21 of the

vertical frame portions

15a, 15b and the inner peripheral wall 21 of the lower frame portion 17 is formed at each of the

corner portions

24a, 24b, and a guide surface 28 that is curved in an arc shape so as to become lower from the inner peripheral walls 21 of the

vertical frame portions

15a, 15b toward the oil recovery groove 25 is formed at an upper end of the rising wall 27.

Therefore, a part of the oil sliding down along the inner peripheral walls 21 of the

vertical frame portions

15a and 15b is guided to the oil recovery groove 25 along the guide surface 28. Since the end 28a of the guide surface 28 on the lower frame portion 17 side is located at the same position as the position of the both end portions of the oil recovery groove 25 or located closer to the center of the oil recovery groove 25 than the position of the both end portions of the oil recovery groove 25, the oil component sliding down the guide surface 28 is easily guided to the oil recovery groove 25.

Further, since the curved surface 29 located in front of the rising wall 27 is formed at each of the

corner portions

24a and 24b, for example, even if the oil reaching the

corner portions

24a and 24b flows out in the direction of the front wall 22 of the lower frame portion 17 beyond the rising wall 27, the oil can be received by the curved surface 29.

At the same time, since the curved surface 29 is curved in an arc shape so as to become lower from the inner peripheral wall 21 of the

vertical frame portions

15a and 15b toward the oil recovery groove 25, the oil component caught by the curved surface 29 is guided to the oil recovery groove 25 along the curved surface 29.

In the present embodiment, since the extension portion 25a of the oil recovery groove 25 is located between the curved surface 29 and the rising wall 27, the oil that has passed over the rising wall 27 can be directly received by the extension portion 25 a.

The filter material 13 is in contact with the surface of the rising wall 27 on the side opposite to the extension portion 25a of the oil recovery groove 25. Therefore, not only the oil components sliding down the

vertical frame portions

15a and 15b can be guided to the oil recovery groove 25, but also the oil components sliding down the left and right end portions of the filter material 13 can be guided to the oil recovery groove 25 along the guide surfaces 28.

Even if the oil sliding down along the inner peripheral walls 21 of the

vertical frame portions

15a and 15b passes in front of the rising wall 27 and slides down, the oil can be received by the curved surface 29 and directly guided to the oil recovery tank 25.

Therefore, by additionally providing the rising walls 27 and the curved surfaces 29 at the left and

right corner portions

24a and 24b located at the lower end of the frame body 12, the oil sliding down along the

vertical frame portions

15a and 15b can be positively guided in the direction of the oil recovery groove 25, and the oil is less likely to be accumulated at the

corner portions

24a and 24 b.

Therefore, oil can be prevented from dropping from the lower end of the housing 12, and the wall and floor of the kitchen can be prevented from being stained.

On the other hand, when the ventilation filter 5 is gradually contaminated and the replacement timing is reached, the contaminated ventilation filter 5 is replaced with a new ventilation filter 5. When the contaminated ventilation filter 5 is discarded, if the frame 12, which is the outer periphery of the ventilation filter 5, maintains a square shape, the volume of the frame 12 becomes large.

In the ventilation filter 5 of the present embodiment, the portions to be bent 36 are provided at one portion of the longitudinal intermediate portions of the

vertical frame portions

15a, 15b, respectively, and the portions to be bent 36 have V-shaped notches 37 that open at the end edges of the outer peripheral walls 20 of the

vertical frame portions

15a, 15 b.

Therefore, when the

vertical frame portions

15a and 15b are forcibly bent in the direction in which the upper frame portion 16 and the lower frame portion 17 are brought closer to each other with the notch 37 as a mark, the

vertical frame portions

15a and 15b are broken with the position of the notch 37 as a starting point, as shown in fig. 9 (a).

In particular, in the present embodiment, the outer peripheral wall 20 of the

vertical frames

15a and 15b is formed with a first groove 38a continuous with the notch 37, and the inner peripheral wall 21 of the

vertical frames

15a and 15b is formed with a second groove 38b opposed to the first groove 38 a. Therefore, when the

vertical frame portions

15a and 15b are bent, the outer peripheral wall 20 and the inner peripheral wall 21 of the

vertical frame portions

15a and 15b are broken along the first groove 38a and the second groove 38 b. As a result, the

vertical frame portions

15a and 15b can be easily bent with only a very small force, and the breaking direction of the

vertical frame portions

15a and 15b can be determined.

Further, since the third groove 38c spanning between the first groove 38a and the second groove 38b is formed in the inner surface of the front wall 22 of the

vertical frame portions

15a and 15b, the

vertical frame portions

15a and 15b of the frame body 12 can be folded by about 180 ° with the third groove 38c serving as a bending fulcrum.

As a result, as shown in fig. 9(B), the frame body 12 can be easily folded into a substantially half size. Therefore, the volume of the frame 12 is not increased when the ventilation filter 5 is discarded, and the ventilation filter 5 can be favorably discarded.

In the first embodiment, both the guide surface 28 and the curved surface 29 of the rising wall 27 are curved in an arc shape. However, the guide surface 28 and the curved surface 29 may be linearly inclined so as to become lower toward the oil recovery groove 25, and the shapes of the guide surface 28 and the curved surface 29 are not particularly limited.

The portions to be bent 36 may be provided at a plurality of positions in the longitudinal direction of the

vertical frame portions

15a and 15 b. With this structure, the frame body 12 can be folded into a smaller shape, and the operation when the dirty ventilation filter 5 is discarded becomes easy.

(second embodiment)

Fig. 10 and 11 show a second embodiment. The second embodiment is different from the first embodiment in the structure of the frame 12 of the ventilation filter 5, and the other structure is the same as the first embodiment. Therefore, in the second embodiment, the same components as those in the first embodiment will be described with the same reference numerals.

As shown in fig. 10, the intermediate portions in the height direction of the left and right

vertical frame portions

15a, 15b of the frame body 12 are not bent like the frame body 12 of the first embodiment, and the entire

vertical frame portions

15a, 15b have a straight shape.

The frame 12 includes a single vertical bar 41, a first horizontal bar 42a, a second horizontal bar 42b, a third horizontal bar 42c, and a fourth horizontal bar 42 d. The vertical bar portion 41 stands up so as to connect a central portion in the longitudinal direction of the upper frame portion 16 and a central portion in the longitudinal direction of the lower frame portion 17, and is curved in an arc shape so that the central portion between the upper frame portion 16 and the lower frame portion 17 protrudes toward the inside of the kitchen. The broken line shown in fig. 10 is a line straightly connecting the central portion of the upper frame portion 16 and the central portion of the lower frame portion 17. With respect to this line, the central portion of the vertical strip portion 41 protrudes the most toward the room of the kitchen, i.e., R.

The first horizontal portion 42a, the second horizontal portion 42b, the third horizontal portion 42c, and the fourth horizontal portion 42d are disposed in an area surrounded by the vertical frame portion 15a, the vertical frame portion 15b, the upper frame portion 16, and the lower frame portion 17. Specifically, the first horizontal bar portion 42a protrudes downward from both end portions of the upper frame portion 16 in a substantially V shape so as to enter between the

vertical frame portions

15a and 15 b. The lower end portions of the first horizontal portions 42a intersect the upper portions of the vertical portions 41.

The second horizontal portion 42b, the third horizontal portion 42c, and the fourth horizontal portion 42d are provided between the inner peripheral walls 21 of the left and right

vertical frame portions

15a, 15b below the first horizontal portion 42 a. The second horizontal portion 42b, the third horizontal portion 42c, and the fourth horizontal portion 42d are arranged at intervals in the longitudinal direction of the

vertical frame portions

15a, 15b, and are curved in an arc shape protruding downward between the

vertical frame portions

15a, 15 b. The curvatures of the second horizontal portion 42b, the third horizontal portion 42c, and the fourth horizontal portion 42d become smaller in order from the second horizontal portion 42b to the fourth horizontal portion 42 d. The second horizontal portion 42b, the third horizontal portion 42c, and the fourth horizontal portion 42d intersect the vertical portion 41 at the longitudinal center portion thereof.

As a result, the first horizontal portion 42a, the second horizontal portion 42b, the third horizontal portion 42c, and the fourth horizontal portion 42d are inclined downward toward the vertical portion 41 between the

vertical frame portions

15a and 15 b.

According to the present embodiment, the first horizontal portion 42a, the second horizontal portion 42b, the third horizontal portion 42c, and the fourth horizontal portion 42d are each curved in an arc shape protruding toward the interior of the kitchen as they go toward the vertical portion 41. Therefore, the frame 12 has a shape in which the central portion of the area surrounded by the vertical frame portion 15a, the vertical frame portion 15b, the upper frame portion 16, and the lower frame portion 17 protrudes toward the inside of the kitchen.

The longitudinal strip 41, the first transverse strip 42a, the second transverse strip 42b, the third transverse strip 42c, and the fourth transverse strip 42d support the filter material 13 in the region surrounded by the longitudinal frame portion 15a, the longitudinal frame portion 15b, the upper frame portion 16, and the lower frame portion 17.

As a result, in a state where the ventilation filter 5 is attached to the front panel 7, the center portion of the filter medium 13 protrudes toward the inside of the kitchen and is away from the air inlet 8 of the front panel 7.

According to the second embodiment, a part of the oil contained in the soot adheres to the first horizontal stripe 42a, the second horizontal stripe 42b, the third horizontal stripe 42c, and the fourth horizontal stripe 42d in the process of being captured by the ventilation filter 5. The oil adhered to the first, second, third and fourth

horizontal portions

42a, 42b, 42c and 42d flows toward the vertical portion 41 along the first, second, third and fourth

horizontal portions

42a, 42b, 42c and 42d inclined downward.

Then, a part of the oil component sliding down along the inner peripheral wall 21 of the

vertical frame parts

15a, 15b is caught by the second horizontal stripe 42b, the third horizontal stripe 42c and the fourth horizontal stripe 42d, and flows along the second horizontal stripe 42b, the third horizontal stripe 42c and the fourth horizontal stripe 42d inclined downward toward the vertical stripe 41.

Therefore, most of the oil adhered to the housing 12 is collected in the vertical bar portion 41. The oil collected in the vertical strip portion 41 slides down along the vertical strip portion 41 and flows into the central portion of the oil recovery tank 25 from the upper surface of the lower frame portion 17.

As a result, the oil adhered to the frame 12 can be efficiently recovered to the oil recovery groove 25 in cooperation with the rising wall 27 and the curved surface 29 provided at the

corner portions

24a and 24b of the frame 12.

In the second embodiment, since the vertical strip 41, the first horizontal strip 42a, the second horizontal strip 42b, the third horizontal strip 42c, and the fourth horizontal strip 42d are all bent to protrude into the room of the kitchen, the central portion of the filter medium 13 supported by the vertical strip 41, the first horizontal strip 42a, the second horizontal strip 42b, the third horizontal strip 42c, and the fourth horizontal strip 42d is also away from the air inlet 8.

Therefore, a sufficient air intake space can be ensured between the central portion of the filter medium 13 and the air intake port 8, and the impeller 4 can take in air from the air intake space. Therefore, as in the first embodiment, the surface area of the filter material 13 can be increased while the ventilation resistance is kept low, and the pressure loss acting on the ventilation fan 1 can be reduced.

In the second embodiment, only one vertical bar portion 41 of the frame body 12 is provided, but a plurality of vertical bar portions 41 may be provided in a row with a space therebetween, and the number of the vertical bar portions 41 is not particularly limited.

In the second embodiment, the

horizontal bar portions

42a, 42b, 42c, and 42d of the frame body 12 are curved in an arc shape, but may be formed in a shape inclined straight toward the vertical bar portions 41.

(third embodiment)

A third embodiment is shown in fig. 12 to 14. The ventilation filter 5 of the third embodiment is different from the first embodiment in the configuration of the frame 12, and is the same as the first embodiment in other configurations. Therefore, in the third embodiment, the same components as those in the first embodiment will be described with the same reference numerals.

As shown in fig. 12 and 13, the frame 12 of the ventilation filter 5 is mainly composed of a frame body 51 and a filter support portion 52. The frame main body 51 is a component that is in contact with the front panel 7 of the ventilation fan main body 2, and has a square shape that defines a part of the outer peripheral walls 20 of the vertical frame portion 15a, the vertical frame portion 15b, the upper frame portion 16, and the lower frame portion 17.

The filter support portion 52 is formed continuously with the frame main body 51 toward the front side of the frame main body 51. The filter support portion 52 has a square shape defining the remaining portion of the outer peripheral wall 20, the inner peripheral wall 21, and the front wall 22 of the vertical frame portion 15a, the vertical frame portion 15b, the upper frame portion 16, and the lower frame portion 17. As shown in fig. 13, the outer peripheral walls 20 of the

vertical frame portions

15a and 15b are inclined so as to approach each other toward the front wall 22. Therefore, in the

vertical frame portions

15a and 15b of the frame 12, the frame main body 51 projects toward the periphery of the filter support portion 52.

As shown in fig. 12 and 13, the outer peripheral wall 20 of the

vertical frame portions

15a and 15b defined by the frame main body 51 and the filter support portion 52 has a step S at the boundary between the frame main body 51 and the filter support portion 52. The step S is a factor generated based on a difference between the size of the frame body 51 and the size of the filter support portion 52. The step S is located at the middle portion in the depth direction of the frame 12.

The step S may be formed continuously in the circumferential direction of the frame 12.

Fig. 14 shows a state in which a plurality of ventilation filters 5 are accommodated in a package box 53. As shown in fig. 14, the frames 12 of the plurality of ventilation filters 5 are overlapped with each other in the depth direction, and the end edge of the frame 12 positioned at the upper stage is caught on the step S of the frame 12 positioned at the lower stage.

Therefore, in a state where the plurality of ventilation filters 5 are accommodated in the packing case 53, the filter support portion 52 of the frame 12 positioned at the lower stage enters the inside of the frame main body 51 of the frame 12 positioned at the upper stage. Since the end edge of the frame 12 positioned at the upper stage is caught by the step S of the frame 12 positioned at the lower stage, a predetermined gap g is ensured between the front wall 22 of the ventilation filter 5 positioned at the lower stage and the filter material 13 of the ventilation filter 5 positioned at the upper stage.

Therefore, in a state where the plurality of ventilation filters 5 are stacked in the depth direction, the front wall 22 of the ventilation filter 5 positioned on the lower stage and the filter material 13 of the ventilation filter 5 positioned on the upper stage are separated from each other and do not interfere with each other.

In the third embodiment, the portions to be bent 36 similar to those in the first embodiment are formed at two positions of the

vertical frame portions

15a and 15 b. The portions to be bent 36 are spaced apart from each other in the longitudinal direction of the

vertical frame portions

15a and 15 b.

According to the third embodiment, in a state where the plurality of ventilation filters 5 are accommodated in the package box 53, the end edge of the frame 12 of the ventilation filter 5 positioned on the upper stage abuts against the step S of the frame 12 of the ventilation filter 5 positioned on the lower stage, and the filter support portion 52 of the frame 12 on the lower stage is surrounded by the frame main body 51 of the frame 12 on the upper stage. In other words, the plurality of ventilation filters 5 are stacked inside the package box 53 such that the lower frame 12 enters the upper frame 12.

Therefore, the stacking height of the plurality of ventilation filters 5 can be kept low, and the packaging volume when the plurality of ventilation filters 5 are stacked together can be reduced. Therefore, the packing volume required for the packing case 53 can be reduced, and accordingly, the packing case 53 can be downsized.

In addition, in a state where a plurality of ventilation filters 5 are stacked, the front wall 22 of the ventilation filter 5 positioned on the lower stage and the filter material 13 of the ventilation filter 5 positioned on the upper stage do not interfere with each other, and damage to the filter material 13 can be avoided.

In the third embodiment, since the portions to be bent 36 are formed at two positions spaced apart from each other in the longitudinal direction of the

vertical frame portions

15a and 15b, when the ventilation filter 5 is gradually stained and needs to be discarded, the frame portion 12 can be folded three times in a direction in which the upper frame portion 16 and the lower frame portion 17 are brought closer to each other, as indicated by arrows in fig. 12. Therefore, the size of the frame 12 is reduced to half or less, and the operation when the ventilation filter 5 is discarded becomes easy.

Although the embodiments of the present invention have been described above, these embodiments are merely examples, and are not intended to limit the scope of the present invention. These new embodiments can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the present invention. These embodiments and modifications thereof are within the scope and spirit of the present invention, and are also included in the scope of the present invention described in the claims and equivalents thereof.

Claims

1. A ventilation filter is provided with: a frame body having left and right vertical frame portions standing at an interval from each other, an upper frame portion spanning between upper ends of the vertical frame portions, and a lower frame portion spanning between lower ends of the vertical frame portions; a filter material that is fixed to the frame so as to cover a region surrounded by the vertical frame portion, the upper frame portion, and the lower frame portion, and that captures oil-containing dust in air; an oil recovery groove provided in the lower frame portion of the frame body, extending in a longitudinal direction of the lower frame portion, and receiving oil components sliding down along a surface of the filter material,

the filter for ventilation is characterized in that,

the frame body has left and right corner portions defined by the vertical frame portion and the lower frame portion, the oil recovery groove is located between the corner portions,

a rising wall that is in contact with the filter material and stands so as to connect between a lower end portion of the vertical frame portion and an end portion of the lower frame portion is provided at the corner portion, a guide surface that is lower from the vertical frame portion toward the oil recovery groove is formed at an upper end of the rising wall, and an end portion of the guide surface on the lower frame portion side is located at the same position as both end portions of the oil recovery groove or located closer to a center side of the oil recovery groove than both end portions of the oil recovery groove.

2. A ventilation filter according to claim 1,

the guide surface of the rising wall has a shape curved downward in an arc shape.

3. A ventilation filter according to claim 1 or 2,

the corner portion of the frame body further includes a curved surface that connects the lower end portion of the vertical frame portion and the end portion of the lower frame portion and is curved in an arc shape, the curved surface being located on the opposite side of the rising wall from the filter material.

4. A ventilation filter according to claim 1,

the frame is detachably supported on the ventilator main body in a manner of covering the air suction side of the ventilator main body with the impeller,

the filter material is fixed to the frame body in a manner of protruding in a direction away from the ventilator body.

5. A ventilation filter according to claim 4,

the frame body has a plurality of horizontal bar portions that connect the vertical frame portions to each other and are arranged at intervals in a longitudinal direction of the vertical frame portion, the horizontal bar portions support the filter material in a region surrounded by the vertical frame portion, the upper frame portion, and the lower frame portion, and a surface of the vertical frame portion of the frame body on a side opposite to a surface supported by the ventilator main body has a shape protruding in a direction away from the ventilator main body.

6. A ventilation filter according to claim 1,

the frame body has:

at least one vertical bar portion that stands so as to connect a middle portion in the longitudinal direction of the upper frame portion and a middle portion in the longitudinal direction of the lower frame portion;

a plurality of horizontal portions arranged in a region surrounded by the vertical frame portion, the upper frame portion, and the lower frame portion so as to intersect with the vertical portion, and inclined downward toward the vertical portion,

the longitudinal strips and the transverse strips support the filter material in a region surrounded by the longitudinal frame portion, the upper frame portion, and the lower frame portion,

the frame body having the longitudinal bar and the lateral bar is detachably supported by the ventilator main body so as to cover the suction side of the ventilator main body having the impeller, and the longitudinal bar and the lateral bar have shapes protruding in a direction away from the ventilator main body.

7. A ventilation filter according to claim 1,

the frame body is made of a synthetic resin material, the vertical frame portion of the frame body has an outer peripheral wall extending in a depth direction of the frame body, a bending scheduled portion is provided at least one position of the outer peripheral wall corresponding to a middle portion in a longitudinal direction of the vertical frame portion,

the portion to be bent has a notch that opens at an end edge of the outer peripheral wall and a first groove that is formed on an inner surface of the outer peripheral wall so as to be continuous with the notch, and the first groove extends in a depth direction of the frame body.

8. A ventilation filter according to claim 7,

the frame body further has an inner peripheral wall opposed to the outer peripheral wall of the vertical frame portion, and a second groove opposed to the first groove is formed in an inner surface of the inner peripheral wall.

9. A ventilation fan is characterized by comprising:

a ventilator main body having an impeller for sucking air;

a ventilation filter according to any one of claims 1 to 8, which is detachably supported by the ventilator main body and covers a suction side of the ventilator main body.