JP7130464B2 - ventilation filters and fans - Google Patents

Description

Embodiments of the present invention relate to a ventilation filter that captures dust containing oil in the air and a ventilation fan having the ventilation filter.

For example, a general ventilation fan used in a kitchen has a ventilation filter that prevents oil smoke generated during cooking from entering the inside of the ventilation fan body. This type of ventilation filter is mainly a disposable type that does not require cleaning, and is composed of a sheet-like filter material that absorbs oil contained in oily smoke and a frame that surrounds and supports the filter material. .

The frame body has left and right vertical frame portions that stand apart from each other, an upper frame portion that spans between upper ends of the vertical frame portions, and a lower frame portion that spans between lower ends of the vertical frame portions. , an oil recovery groove is formed on the upper surface of the lower frame. The oil recovery groove extends in the longitudinal direction of the lower frame portion so as to be positioned between left and right corner portions defined by the lower ends of the left and right vertical frame portions and both ends of the lower frame portion.

According to the conventional ventilating fan, mist-like oil adhering to the surface of the filter material grows into particles with the lapse of operation time, and eventually runs down along the surface of the filter material due to its own weight. The oil that flows along the surface of the filter material reaches the lower frame portion of the frame and is collected in the oil recovery grooves of the lower frame portion.

Furthermore, mist-like oil adheres not only to the filter material but also to the frame. The oil adhering to the frame flows down along the vertical frame and is led to the oil recovery groove from the corner of the frame.

Japanese Utility Model Laid-Open No. 64-16538 JP-A-2000-70634

In a conventional ventilation fan, the left and right corners of the frame have angular shapes. For this reason, the oil tends to stay in the corners, and the accumulated oil tends to solidify in the corners. Moreover, since the oil recovery groove is located between the left and right corners and the corners are separated from the oil recovery groove, the oil content reaching the corners is not guided to the oil recovery groove, and the oil content is not guided to the oil recovery groove from the lower end of the frame. It can flow out of the body. In particular, when a solid substance consisting of a mass of oil is present in a corner portion, it cannot be denied that the solid substance blocks the flow of the oil or causes the oil to flow in an unspecified direction.

As a result, the oil that runs down along the vertical frame drips from the lower end of the frame, becoming one of the factors that stain the walls and floor of the kitchen.
SUMMARY OF THE INVENTION An object of the present invention is to provide a ventilation filter capable of reliably guiding oil flowing down along the vertical frame portion of a frame to an oil recovery groove.

According to the embodiment, the ventilation filter includes left and right vertical frame portions standing with a space therebetween, an upper frame portion extending between the upper ends of the vertical frame portions, and between the lower ends of the vertical frame portions. and a lower frame straddling a frame, and fixed to the frame so as to cover an area surrounded by the vertical frame, the upper frame, and the lower frame, and removes dust containing oil in the air. and an oil recovery groove that is provided in the lower frame portion of the frame body and receives oil that runs 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 positioned between the corner portions. Further, an upright wall is provided at the corner portion so as to be in contact with the filter material and to connect a lower end portion of the vertical frame portion and an end portion of the lower frame portion. A guide surface is formed that becomes lower along the direction of the oil recovery groove from the vertical frame portion. The end portion of the guide surface on the side of the lower frame portion is positioned at the same position as both end portions of the oil recovery groove or at the center side of the oil recovery groove. The corner portion of the frame further includes a curved surface curved in an arc connecting the lower end portion of the vertical frame portion and the end portion of the lower frame portion, and the curved surface is attached to the filter material. It is positioned on the opposite side with the standing wall interposed therebetween.

FIG. 1 is a front view of the ventilation fan according to the first embodiment. FIG. 2 is an exploded perspective view of the ventilation fan according to the first embodiment. FIG. 3 is a rear perspective view of the ventilation filter according to the first embodiment. FIG. 4 is a perspective view showing an enlarged portion of F4 in FIG. FIG. 5 is a rear view of the ventilation filter according to the first embodiment, viewed from the rear side. FIG. 6 is a cross-sectional view taken along line F6-F6 in FIG. FIG. 7 is a rear view showing an enlarged portion of F7 in FIG. 8 is a cross-sectional view taken along line F8-F8 in FIG. 7. FIG. (A) is a perspective view showing a state in which the ventilation filter is folded at the position of the notch. (B) is a perspective view showing a state in which the ventilation filter is folded in half. FIG. 10 is a perspective view of the ventilation filter according to the second embodiment. FIG. 11 is a perspective view showing an enlarged portion F11 in FIG. FIG. 12 is a perspective view of a ventilation filter according to the third embodiment. FIG. 13 is a cross-sectional view of the ventilation filter according to the third embodiment. FIG. 14 is a cross-sectional view showing a state in which a plurality of ventilation filters are stacked and packed in the third embodiment.

[First embodiment]
A first embodiment will be described below with reference to FIGS. 1 to 9. FIG.
FIG. 1 is a front view of a typical ventilation fan 1 used, for example, in a kitchen, and FIG. 2 is an exploded perspective view of the ventilation fan 1. As shown in FIG. As shown in FIGS. 1 and 2, the ventilation fan 1 includes a ventilation fan body 2, a motor 3, an impeller 4, and a disposable ventilation filter 5 as main elements.

The ventilation fan main body 2 is attached to the wall surface of the kitchen. The ventilation fan main body 2 is composed of a cylindrical bell mouth 6 penetrating an exhaust port opened in the wall surface of the kitchen, and a square front panel 7 integrated with the bell mouth 6. - 特許庁The front panel 7 is exposed from the wall surface of the kitchen to the room, and has a circular intake port 8 that continues to the bell mouth 6 .

The motor 3 is supported by the ventilation fan body 2 . A rotating shaft 3 a of the motor 3 is positioned coaxially with the bell mouth 6 . The impeller 4 has a boss portion 9 connected to the rotating shaft 3 a of the motor 3 and a plurality of blades 10 provided on the outer peripheral surface of the boss portion 9 . The impeller 4 is arranged inside the bell mouth 6 so as to face the intake port 8. - 特許庁

When the impeller 4 rotates with the start of the motor 3, a negative pressure acts on the intake port 8, and the air in the kitchen is sucked into the ventilation fan main body 2 through the intake port 8. - 特許庁The air sucked into the ventilation fan body 2 passes through the ventilation fan body 2 and is discharged outside the kitchen.
The ventilation filter 5 is an element that prevents the oil in the smoke generated in the kitchen during cooking from being sucked into the intake port 8 of the ventilation fan main body 2. is detachably supported on the front panel 7 of the. Oil smoke is an example of dust containing oil in the air, and may contain fine particles such as powder in addition to oil.

As shown in FIGS. 2 to 6, the ventilation filter 5 is composed of a frame 12 and a filter material 13 that traps oil in oily smoke.
The frame 12 is made of a synthetic resin material such as ABS resin, and has a square shape that matches the front panel 7 . Specifically, the frame body 12 includes left and right vertical frame portions 15a and 15b standing with a space therebetween, a horizontal upper frame portion 16 extending between the upper ends of the vertical frame portions 15a and 15b, and a vertical a horizontal lower frame portion 17 straddling between the lower ends of the frame portions 15a and 15b; a plurality of horizontal beam portions 18 extending between the vertical frame portions 15a and 15b between the upper frame portion 16 and the lower frame portion 17; It has

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

The front wall 22 is formed continuously in the circumferential direction of the frame 12 while straddling between the leading edge of the outer peripheral wall 20 and the leading edge of the inner peripheral wall 21 located inside the kitchen. For this reason, the front wall 22 is exposed to the interior of the kitchen while surrounding the inner peripheral wall 21 continuous in the peripheral direction of the frame 12 with a width of several millimeters.

Furthermore, as shown in FIG. 6, the length of the outer peripheral wall 20 along the depth direction of the frame 12 is set longer than the length of the inner peripheral wall 21 along the depth direction of the frame 12 . Therefore, the outer peripheral wall 20 surrounds the inner peripheral wall 21 over the entire circumference of the frame 12, and the edge opposite to the front wall 22 abuts against the outer peripheral portion of the front panel 7. there is

According to this embodiment, the vertical frame portions 15a and 15b of the frame 12 have a shape curved in an arc so that the tip portion on the side opposite to the front panel 7 protrudes into the kitchen. . Therefore, the central portion along the height direction of the frame 12 is further away from the front panel 7 than the upper and lower ends of the frame 12 .

The plurality of horizontal beam portions 18 are arranged in parallel with each other at intervals in the longitudinal direction of the vertical frame portions 15a and 15b. Both ends along the longitudinal direction of the horizontal beam portion 18 are integrally abutted against the inner peripheral walls 21 of the vertical frame portions 15a and 15b. The horizontal beam portions 18 are arranged corresponding to the curved shape of the vertical frame portions 15a and 15b, and the horizontal beam portion 18 closer to the central portion of the vertical frame portions 15a and 15b is farther away from the front panel 7 of the ventilation fan body 2.

The filter material 13 is made of, for example, a sheet-shaped nonwoven fabric. The non-woven fabric has the property of absorbing oil contained in soot, and its outer peripheral edge is fixed to the inner peripheral wall 21 of the frame 12 and the edge of the crosspiece 18 by means of heat welding, for example.
Therefore, the filter material 13 is an integral structure with the frame 12 and entirely covers the area surrounded by the vertical frame portions 15a and 15b, the upper frame portion 16 and the lower frame portion 17 of the frame 12. .

As shown in FIGS. 2 and 4, the lower ends of the inner peripheral walls 21 of the vertical frame portions 15a and 15b and both longitudinal ends of the inner peripheral wall 21 of the lower frame portion 17 intersect at the lower end of the frame 12 and , cooperate with each other to define left and right corner portions 24a and 24b. The corner portions 24a and 24b are positioned closer to the inside of the kitchen than the filter material 13 is.

A lower frame portion 17 of the frame body 12 is provided with an oil recovery groove 25 . The oil recovery groove 25 extends in the longitudinal direction of the lower frame portion 17 between the corner portions 24 a and 24 b of the frame 12 . Further, the oil recovery groove 25 is opened in the inner peripheral wall 21 of the lower frame portion 17 that defines the upper surface of the lower frame portion 17 immediately before the lower end portion of the filter material 13 . The inner peripheral wall 21 is inclined downward from the filter material 13 toward the oil recovery groove 25 .

According to this embodiment, extension portions 25a are formed at both ends of the oil recovery groove 25 along the longitudinal direction. As shown in FIG. 4 as a representative of one of the extensions 25a, the extension 25a is a slit-shaped element formed narrower than the main portion of the oil recovery groove 25, and extends toward the corner 24a. extended.

As shown in FIGS. 1, 2 and 4, upright walls 27 are provided at the corners 24a and 24b of the frame 12, respectively. The standing wall 27 is a rib-like element that stands up so as to connect the lower ends of the inner peripheral walls 21 of the vertical frame portions 15a and 15b and the longitudinal ends of the inner peripheral wall 21 of the lower frame portion 17. , the extended portion 25 a of the oil recovery groove 25 is positioned immediately before the upright wall 27 . A surface of the standing wall 27 opposite to the extended portion 25 a of the oil recovery groove 25 is in contact with the filter material 13 .

A guide surface 28 is formed on the upper edge of the standing wall 27 . An end portion 28 a of the guide surface 28 on the side of the lower frame portion 17 is positioned at the same position as both end portions of the oil recovery groove 25 or at the center side of the oil recovery groove 25 . Further, the guide surface 28 has an arcuate curved shape that becomes lower in the direction of the oil recovery groove 25 from the inner peripheral wall 21 of the vertical frame portions 15a and 15b.

As shown in FIGS. 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 ends of the inner peripheral walls 21 of the vertical frame portions 15a and 15b and both longitudinal ends of the inner peripheral wall 21 of the lower frame portion 17, and extends from the vertical frame portions 15a and 15b to the lower frame portion. It is curved in an arc so that it becomes lower as it advances in the direction of 17 .

Further, the curved surface 29 is located on the opposite side of the filter material 13 with the standing wall 27 interposed therebetween. Therefore, the oil recovery groove 25 formed in the lower frame portion 17 is positioned between the curved surfaces 29 of the corner portions 24a and 24b. facing both ends along the longitudinal direction of the An extended portion 25 a of the oil recovery groove 25 is interposed between the upright wall 27 and the curved surface 29 .

As shown in FIGS. 2 and 3 , a pair of engagement holes 31 a and 31 b are formed in the upper frame portion 16 of the frame body 12 . The engaging holes 31a and 31b are arranged in the longitudinal direction of the upper frame portion 16 with a space therebetween. A pair of locking pieces 32 a and 32 b are formed on the lower frame portion 17 of the frame body 12 . The locking pieces 32 a and 32 b are arranged in a line in the longitudinal direction of the lower frame portion 17 with an interval therebetween and protrude toward the back side of the lower frame portion 17 .

According to this embodiment, the ventilation filter 5 has a pair of engaging claws 33a and 33b that protrude from the upper edge of the front panel 7 and are engaged with the engaging holes 31a and 31b of the upper frame portion 16. are detachably supported by the front panel 7 by fitting the locking pieces 32a and 32b into fitting holes 34a and 34b opened at the lower edge of the front panel 7. As shown in FIG.

When the ventilation filter 5 is attached to the front panel 7, the filter material 13 faces the intake port 8 of the ventilation fan body 2. - 特許庁Further, the vertical frame portions 15a and 15b of the frame 12 are heat-welded to the frame 12 because the ends thereof on the side opposite to the front panel 7 are curved in an arc shape so as to protrude into the kitchen. Even with the filter material 13 , the central portion is away from the intake port 8 .

Therefore, the central portion of the filter material 13 is farther from the air intake port 8 than the outer peripheral edge of the filter material 13, and a sufficient air intake space is provided between the central portion of the filter material 13 and the air intake port 8. Secured.
Therefore, when the impeller 4 rotates, the impeller 4 sucks air from the air intake space, and although the air intake port 8 is covered with the ventilation filter 5, ventilation resistance can be kept small. At the same time, since the central portion of the filter material 13 moves away from the impeller 4, the filter material 13 is less likely to be caught in the rotating impeller 4. - 特許庁

Furthermore, by curving the vertical frame portions 15a and 15b, the surface area of the filter material 13 can be expanded, 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 vertical frame portions 15a and 15b of the frame 12 are each provided with a portion to be folded 36 at one intermediate portion along the longitudinal direction. FIG. 7 and FIG. 8 show the intended bending portion 36 provided on one of the vertical frame portions 15a. The portion to be bent 36 is defined by a fine notch 37 and first to third grooves 38a, 38b, and 38c.

The notch 37 is an element that serves as a mark indicating the bending position of the frame 12 , and is opened at the edge of the outer peripheral wall 20 of the vertical frame portions 15 a and 15 b butted against the front panel 7 . The notch 37 has a V-shaped opening as a preferred example.
The first groove 38 a is formed in the inner surface of the outer peripheral wall 20 continuously with the notch 37 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, 15b. The second groove 38b extends straight in the depth direction of the frame 12 and faces the first groove 38a.
The third groove 38c is formed on the inner surface of the front wall 22 of the vertical frame portions 15a and 15b. 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 38b.

The first groove 38a, the second groove 38b and the third groove 38c preferably have a V-shaped cross section as shown in FIGS. 7 and 8. FIG.
In the ventilating fan 1 having such a configuration, when the impeller 4 rotates with the start of the motor 3, oily smoke generated in the kitchen during cooking, for example, is sucked into the intake port 8 of the ventilating fan main body 2 through the filter material 13 of the ventilation filter 5. . 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 granules as the operating time of the ventilation fan 1 elapses, and eventually runs down along the surface of the filter material 13 due to its own weight.

The oil that flows along the surface of the filter material 13 climbs over the crosspiece 18 and reaches the lower frame portion 17 of the frame 12, and along with the inclination of the inner peripheral wall 21 of the lower frame portion 17, is directed toward the oil recovery groove 25. flow. Therefore, most of the oil flowing down along the surface of the filter material 13 is received by the oil recovery groove 25 and recovered in the oil recovery groove 25 without dripping outside the ventilation fan 1.例文帳に追加

On the other hand, the oil contained in the soot also adheres to the frame 12 surrounding the filter material 13 . Some of the oil adhering to the frame 12 runs down along the vertical frame portions 15a and 15b and reaches the left and right corner portions 24a and 24b.
In particular, since the inner peripheral wall 21 of the frame 12 is adjacent to the filter material 13 that absorbs the oil, the oil contained in the soot easily adheres to the inner peripheral wall 21 . The oil adhering to the inner peripheral walls 21 of the vertical frame portions 15a and 15b runs down toward the corner portions 24a and 24b due to their own weight.

In the present embodiment, rib-shaped standing walls 27 are formed at the corner portions 24a and 24b so as to connect the inner peripheral walls 21 of the vertical frame portions 15a and 15b and the inner peripheral wall 21 of the lower frame portion 17. An arc-shaped guide surface 28 is formed at the upper end of the upright wall 27 so as to be curved downward toward the oil recovery groove 25 from the inner peripheral wall 21 of the vertical frame portions 15a and 15b.

Therefore, part of the oil flowing down along the inner peripheral wall 21 of the vertical frame portions 15 a and 15 b is guided along the guide surface 28 toward the oil recovery groove 25 . Since the end portion 28a of the guide surface 28 on the lower frame portion 17 side is formed at the same position as the both end portions of the oil recovery groove 25 or at a position close to the center side of the oil recovery groove 25, the guide surface 28 is The transmitted oil is easily led to the oil recovery groove 25. - 特許庁

In addition, since the corner portions 24a and 24b are formed with a curved surface 29 positioned in front of the standing wall 27, the oil that reaches the corner portions 24a and 24b passes over the standing wall 27 and reaches the lower frame portion 17. Even if the oil flows out in the direction of the front wall 22, the curved surface 29 can catch the oil.

At the same time, since the curved surface 29 is curved in an arc so as to become lower in the direction of the oil recovery groove 25 from the inner peripheral wall 21 of the vertical frame portions 15a and 15b, the oil received by the curved surface 29 is 29 in the direction of the oil recovery groove 25 .
In this embodiment, the extended portion 25a of the oil recovery groove 25 enters between the curved surface 29 and the standing wall 27, so that the extended portion 25a can directly receive the oil that has exceeded the standing wall 27.

Furthermore, the upright wall 27 is in contact with the filter material 13 on the side opposite to the extended portion 25 a of the oil recovery groove 25 . Therefore, not only the oil flowing down along the vertical frame portions 15a and 15b, but also the oil flowing down along the left and right ends of the filter material 13 can be guided along the guide surface 28 toward the oil recovery groove 25.

In addition, even if the oil that runs along the inner peripheral walls 21 of the vertical frame portions 15a and 15b flows down in front of the standing wall 27, the oil can be received by the curved surface 29 and guided to the oil recovery groove 25 as it is.
Therefore, by adding the upright wall 27 and the curved surface 29 to the left and right corner portions 24a and 24b located at the lower end of the frame 12, the oil flowing down along the vertical frame portions 15a and 15b is actively removed from the oil collecting groove 25. Therefore, it becomes difficult for the oil to stay in the corner portions 24a and 24b.

Therefore, dripping of oil from the lower end of the frame 12 can be avoided, and contamination of the walls and floor of the kitchen can be prevented.
On the other hand, when the fouling of the ventilation filter 5 progresses and the time for replacement of the ventilation filter 5 is reached, the soiled ventilation filter 5 is replaced with a new ventilation filter 5 . When discarding the dirty ventilation filter 5, if the frame 12, which is the outer shell of the ventilation filter 5, maintains a square shape, the frame 12 may become bulky.

In the ventilation filter 5 of the present embodiment, the planned bending portion 36 is provided at each intermediate portion along the longitudinal direction of the vertical frame portions 15a and 15b. The wall 20 has a V-shaped notch 37 which opens into the edge thereof.
Therefore, if 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 approach using the notch 37 as a mark, the vertical frame portion 15a is formed as shown in FIG. 9(A). , 15b are broken with the position of the notch 37 as the starting point.

Particularly, in this embodiment, the first grooves 38a are formed in the outer peripheral walls 20 of the vertical frame portions 15a and 15b to continue to the notches 37, and the inner peripheral walls 21 of the vertical frame portions 15a and 15b face the first grooves 38a. A second groove 38b is formed. 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 grooves 38a and the second grooves 38b. As a result, the vertical frame portions 15a and 15b can be easily bent with a small force, and the breaking directions of the vertical frame portions 15a and 15b are determined.

Further, the inner surface of the front wall 22 of the vertical frame portions 15a and 15b is formed with a third groove 38c extending between the first groove 38a and the second groove 38b. , the outer frame portions 15a and 15b of the frame body 12 can be folded back by approximately 180°.

As a result, as shown in FIG. 9(B), the frame 12 can be easily folded to approximately half its size. Therefore, when discarding the ventilation filter 5, the frame 12 does not become bulky, and the ventilation filter 5 can be easily handled when discarded.
In the first embodiment, the guide surface 28 and curved surface 29 of the standing wall 27 are each 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.

Furthermore, the portions to be bent 36 may be provided at a plurality of locations along the longitudinal direction of the vertical frame portions 15a and 15b. According to this configuration, the frame 12 can be folded into a more compact shape, which facilitates handling when discarding the soiled ventilation filter 5 .
[Second embodiment]
Figures 10 and 11 disclose a second embodiment. The second embodiment differs from the first embodiment in matters related to the frame 12 of the ventilation filter 5, and the rest of the configuration is the same as the first embodiment. Therefore, in the second embodiment, the same reference numerals are given to the same components as in the first embodiment, and the description thereof will be omitted.

As shown in FIG. 10, the left and right vertical frame portions 15a and 15b of the frame 12 are not curved in the middle portion along the height direction like the frame 12 of the first embodiment, and are vertically curved. The frame portions 15a and 15b have a generally straight shape.
Further, the frame body 12 includes one vertical bar portion 41 and first to fourth horizontal bar portions 42a, 42b, 42c, and 42d. The vertical beam portion 41 is erected so as to connect the longitudinal center portion of the upper frame portion 16 and the longitudinal center portion of the lower frame portion 17 , and the vertical beam portion 41 connects the upper frame portion 16 and the lower frame portion 17 . The central part between them is curved in an arc shape so as to protrude into the kitchen. The dashed line shown in FIG. 10 is a straight line 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 part of the vertical bar part 41 protrudes into the kitchen room with the maximum R.

The first to fourth horizontal bars 42a, 42b, 42c, 42d are arranged in a region surrounded by the vertical frame portions 15a, 15b, the upper frame portion 16 and the lower frame portion 17. As shown in FIG. Specifically, the first horizontal beam portion 42a protrudes downward from both ends of the upper frame portion 16 in a substantially V shape so as to extend between the vertical frame portions 15a and 15b. The lower end of the first horizontal beam portion 42 a intersects with the upper portion of the vertical beam portion 41 .

The second to fourth horizontal beams 42b, 42c, 42d span between the inner peripheral walls 21 of the left and right vertical frame portions 15a, 15b below the first horizontal beam 42a. The second to fourth horizontal bars 42b, 42c, and 42d are arranged in the longitudinal direction of the vertical frame portions 15a and 15b with a gap therebetween, and project downward between the vertical frame portions 15a and 15b. is curved into an arc. The curvatures of the second to fourth horizontal beam portions 42b, 42c, and 42d gradually decrease from the second horizontal beam portion 42b to the fourth horizontal beam portion 42d. Further, intermediate portions along the longitudinal direction of the second to fourth horizontal beam portions 42b, 42c, and 42d intersect the vertical beam portions 41, respectively.

As a result, the first to fourth horizontal beam portions 42a, 42b, 42c, and 42d are inclined downward toward the vertical beam portion 41 between the vertical frame portions 15a and 15b.
According to this embodiment, the first to fourth horizontal beams 42a, 42b, 42c, and 42d are curved in an arc shape so as to protrude into the kitchen as they move toward the vertical beam 41. As shown in FIG. Therefore, the frame 12 has a shape such that the central portion of the area surrounded by the vertical frame portions 15a and 15b, the upper frame portion 16 and the lower frame portion 17 protrudes toward the interior of the kitchen.

The vertical beam portion 41 and the first to fourth horizontal beam portions 42a, 42b, 42c, and 42d support the filter material 13 in the area surrounded by the vertical frame portions 15a and 15b, the upper frame portion 16 and the lower frame portion 17. ing.
As a result, when the ventilation filter 5 is attached to the front panel 7 , the central portion of the filter material 13 protrudes toward the interior of the kitchen and is away from the air intake 8 of the front panel 7 .

According to the second embodiment, part of the oil contained in the oily smoke adheres to the first to fourth horizontal bars 42a, 42b, 42c, 42d in the process of being captured by the ventilation filter 5. FIG. The oil adhering to the first to fourth horizontal rail portions 42a, 42b, 42c, and 42d travels along the downwardly inclined first to fourth horizontal rail portions 42a, 42b, 42c, and 42d to the vertical rail portion 41. flow in the direction of

Furthermore, part of the oil that flows down along the inner peripheral walls 21 of the vertical frame portions 15a and 15b is received by the second to fourth horizontal beam portions 42b, 42c and 42d, and the downwardly inclined second to fourth horizontal beam portions 42b, 42c and 42d receive the oil. It flows in the direction of the vertical beam portion 41 along the horizontal beam portions 42b, 42c, and 42d.

Therefore, most of the oil adhering to the frame body 12 can be collected in the vertical bar portion 41 . The oil collected on the vertical bar portion 41 flows down along the vertical bar portion 41 and flows into the central portion of the oil recovery groove 25 from the upper surface of the lower frame portion 17 .
As a result, together with the provision of the upright walls 27 and the curved surfaces 29 at the corners 24 a and 24 b of the frame 12 , the oil adhering to the frame 12 can be efficiently recovered by the oil recovery grooves 25 .

In addition, in the second embodiment, since the vertical beam portion 41 and the first to fourth horizontal beam portions 42a, 42b, 42c, and 42d are curved so as to protrude into the kitchen, the vertical beam portion 41 Also, the central portion of the filter material 13 supported by the first to fourth horizontal bars 42a, 42b, 42c, and 42d is away from the intake port 8. FIG.

Therefore, a sufficient air intake space can be secured between the central portion of the filter material 13 and the air intake port 8, and the impeller 4 sucks air from the air intake space. Therefore, as in the first embodiment, the ventilation resistance can be kept small, and the surface area of the filter material 13 can be expanded to reduce the pressure loss acting on the ventilating fan 1 .

In the second embodiment, the frame body 12 has one vertical crosspiece 41, but a plurality of vertical crosspieces 41 may be arranged at intervals. No restrictions.
In addition, in the second embodiment, the horizontal beams 42a, 42b, 42c, and 42d of the frame 12 are curved in an arc shape. good.
[Third Embodiment]
Figures 12-14 disclose a third embodiment. The third embodiment differs from the first embodiment in the configuration of the frame 12 of the ventilation filter 5, and the rest of the configuration is the same as the first embodiment. Therefore, in the third embodiment, the same reference numerals are given to the same components as in the first embodiment, and the description thereof will be omitted.

As shown in FIGS. 12 and 13 , the frame 12 of the ventilation filter 5 is composed of a frame main body 51 and a filter support portion 52 . The frame main body 51 is an element that abuts against the front panel 7 of the ventilation fan main body 2, and has a rectangular shape that defines a part of the outer peripheral wall 20 of the vertical frame portions 15a and 15b, the upper frame portion 16 and the lower frame portion 17. have.

The filter support portion 52 is formed continuously on the front side of the frame main body 51 . The filter support portion 52 has a rectangular shape that defines the vertical frame portions 15 a and 15 b , the remaining portions of the outer peripheral wall 20 of the upper frame portion 16 and the lower frame portion 17 , the inner peripheral wall 21 and the front wall 22 . As shown in FIG. 13, the outer peripheral walls 20 of the vertical frame portions 15a and 15b are inclined toward the front wall 22 and closer to each other. Therefore, the vertical frame portions 15 a and 15 b of the frame body 12 protrude around the filter support portion 52 at the portion of the frame body 51 .

As shown in FIGS. 12 and 13, the outer peripheral wall 20 of the vertical frame portions 15a and 15b defined by the frame body 51 and the filter support portion 52 has a step S at the boundary between the frame body 51 and the filter support portion 52. have. The step S is an element caused by the difference in size between the frame main body 51 and the filter support portion 52 . The step S is positioned at an intermediate portion along the depth direction of the frame 12 .

Note that the step S may be formed continuously in the circumferential direction of the frame 12 .
FIG. 14 shows a form in which a plurality of ventilation filters 5 are housed in a packing box 53. As shown in FIG. As shown in FIG. 14, the frames 12 of the plurality of ventilation filters 5 are stacked on each other in the depth direction, and the end of the frame 12 located on the upper stage is above the step S of the frame 12 located on the lower stage. The rim is stuck.

Therefore, when a plurality of ventilation filters 5 are accommodated in the packing box 53, the filter support part 52 of the frame 12 positioned at the lower stage is inserted inside the frame main body 51 of the frame 12 positioned at the upper stage. Furthermore, the edge of the frame 12 located in the upper stage is caught on the step S of the frame 12 located in the lower stage, so that the front wall 22 of the ventilation filter 5 located in the lower stage and the ventilation filter 5 located in the upper stage are separated from each other. A predetermined gap g is ensured between the filter material 13 of .

Therefore, even when a plurality of ventilation filters 5 are stacked in the depth direction, the front wall 22 of the lower ventilation filter 5 and the filter material 13 of the upper ventilation filter 5 interfere with each other. so far away.
Furthermore, in the third embodiment, bending portions 36 similar to those in the first embodiment are formed at two positions of the vertical frame portions 15a and 15b. The portions to be bent 36 are separated from each other in the longitudinal direction of the vertical frame portions 15a and 15b.

According to the third embodiment, when a plurality of ventilation filters 5 are housed inside the packing box 53, the edge of the frame 12 of the ventilation filter 5 in the upper stage is attached to the frame 12 of the ventilation filter 5 in the lower stage. , the filter support portion 52 of the lower frame 12 is surrounded by the frame main body 51 of the upper frame 12 . In other words, a plurality of ventilation filters 5 are stacked inside the packaging box 53 so that the lower frame 12 is inside the upper frame 12 .
Therefore, the stacking height of the plurality of ventilation filters 5 can be kept low, and the packing volume when the plurality of ventilation filters 5 are stacked can be reduced. Therefore, the packing volume required by the packing box 53 can be reduced, and the packing box 53 can be made compact accordingly.

Moreover, even when a plurality of ventilation filters 5 are stacked, the front wall 22 of the lower ventilation filter 5 and the filter material 13 of the upper ventilation filter 5 do not interfere with each other. Damage to the filter material 13 can be avoided.
Furthermore, in the third embodiment, since the folding planned portions 36 are formed at two locations separated in the longitudinal direction of the vertical frame portions 15a and 15b, when discarding the ventilation filter 5 that has become highly soiled, As indicated by arrows at 12, frame 12 can be folded in three such that upper frame portion 16 and lower frame portion 17 are closer together. Therefore, the size of the frame 12 is reduced to half or less, and the ventilation filter 5 can be easily handled when discarded.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1... Ventilation fan, 2... Ventilation fan main body, 4... Impeller, 5... Ventilation filter, 12... Frame body, 13... Filter material, 15a, 15b... Vertical frame part, 16... Upper frame part, 17... Lower frame part, 24a, 24b...corners, 25...oil recovery grooves, 27...upright walls, 28...guide surfaces, 28a...ends.

Claims (9)

a frame body having left and right vertical frame portions that stand apart from each other, an upper frame portion that spans between upper ends of the vertical frame portions, and a lower frame portion that spans between lower ends of the vertical frame portions; ,
a filter material that is fixed to the frame so as to cover the area surrounded by the vertical frame, the upper frame and the lower frame and captures dust containing oil in the air;
an oil recovery groove that is provided in the lower frame portion of the frame body, extends in the longitudinal direction of the lower frame portion, and receives oil that flows down along the surface of the filter material, the ventilation filter comprising:
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 positioned between the corner portions,
The corner portion is provided with an upright wall which is in contact with the filter material and which rises so as to connect a lower end portion of the vertical frame portion and an end portion of the lower frame portion. A guide surface is formed that becomes lower as it progresses from the vertical frame portion toward the oil recovery groove, and the end portion of the guide surface on the lower frame portion side is positioned at the same position as both ends of the oil recovery groove, or the oil recovery groove. located in the center of the groove ,
The corner portion of the frame further includes a curved surface curved in an arc connecting the lower end portion of the vertical frame portion and the end portion of the lower frame portion, and the curved surface is attached to the filter material. and a ventilation filter located on the opposite side of the standing wall . 2. The ventilation filter according to claim 1, wherein the guide surface of the standing wall has a shape curved downward in an arc shape. The frame body is detachably supported by the ventilation fan body so as to cover the intake side of the ventilation fan body having the impeller,
3. The ventilation filter according to claim 1, wherein the filter material is fixed to the frame in such a manner as to protrude away from the ventilation fan body. The frame has a plurality of horizontal bars arranged at intervals in the longitudinal direction of the vertical frame so as to connect between the vertical frames, and the horizontal bars are arranged in the vertical frame. , the filter material is supported in a region surrounded by the upper frame portion and the lower frame portion, and the surface opposite to the surface supported by the ventilation fan main body of the vertical frame portion of the frame is the ventilation fan main body. 4. The ventilation filter according to claim 3 , having a shape projecting in a direction away from the . The frame is
at least one vertical crosspiece erected to connect an intermediate portion along the longitudinal direction of the upper frame portion and an intermediate portion along the longitudinal direction of the lower frame portion;
A plurality of horizontal beams arranged in a region surrounded by the vertical frame portion, the upper frame portion and the lower frame portion so as to intersect the vertical beam portion, and inclined downward toward the vertical beam portion. and
The vertical beam portion and the horizontal beam portion support the filter material in a region surrounded by the vertical frame portion, the upper frame portion and the lower frame portion, and
The frame body having the vertical beam portion and the horizontal beam portion is detachably supported by the ventilation fan body so as to cover the intake side of the ventilation fan body having the impeller, and the vertical beam portion and the horizontal beam portion. 2. The ventilation filter according to claim 1, wherein has a shape projecting in a direction away from said ventilation fan main body. The frame body is made of a synthetic resin material, and the vertical frame portion of the frame body has an outer peripheral wall extending in the depth direction of the frame body and corresponds to an intermediate portion along the longitudinal direction of the vertical frame portion. At least one portion of the outer peripheral wall is provided with a portion to be bent,
The portion to be bent has a notch opened at the edge of the outer peripheral wall, and a first groove formed in the inner surface of the outer peripheral wall continuously with the notch, and the first 6. The ventilation filter according to claim 1 , wherein the groove extends in the depth direction of the frame. 7. The ventilation according to claim 6 , wherein the frame body has an inner peripheral wall facing the outer peripheral wall of the vertical frame portion, and a second groove facing the first groove is formed on the inner surface of the inner peripheral wall. Filter for. The outer peripheral wall of the vertical frame portion of the frame body is inclined in a direction of approaching each other as the distance from the ventilation fan main body increases, and a step is provided at an intermediate portion in the depth direction of the frame body. Item 8. The ventilation filter according to Item 7 . a ventilation fan body having an impeller for sucking air;
9. The ventilation filter according to any one of claims 1 to 8 , which is detachably supported by the ventilation fan body and covers the intake side of the ventilation fan body;
ventilation fan.

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