JP2008202884A - Ventilation fan for kitchen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation fan for a kitchen without staining a wall surface part provided with the ventilation fan by oils. <P>SOLUTION: This ventilation fan has a propeller fan 20 having a blade 23 projected to a front face from a bell-mouth 30, a filter 40 having a cutoff part 44 on a side surface, and a cover 50 having an upper surface cover 53 and an under surface cover 54, and is formed so as not to splash the oil outside by the cutoff part 44, the upper surface cover 53 and the under surface cover 54, even if a blade 24 stuck with the oil is rotated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a kitchen ventilation fan used in a kitchen, a kitchen, or the like, and more particularly, to a technique for preventing oil scattering.

  As means for discharging air from the room to the outside, opening and closing of ventilation windows and ventilation fans are used. However, since the opening and closing of the ventilation window depends on external weather (outside air temperature, rainy weather, no wind and strong wind, etc.), a ventilation fan is mainly used as a means for forcibly discharging air. Many. In particular, kitchens such as kitchens and restaurants are filled with smoke, oily smoke, odors and the like generated during cooking. In order to discharge such smoke and the like outdoors, a kitchen fan is frequently used during cooking.

  The ventilation fan used in the kitchen is equipped with a filter so that oil used when fried or stir-fried is mixed with smoke, etc. and scattered (oil smoke, etc.) so that the oil is not scattered outside when using a ventilation fan. Furthermore, it has a structure in which oil is stored in the oil receiver. For example, what uses a punching filter which has a hole by performing what is called punching to a filter is known (for example, refer to patent documents 1).

Further, as shown in FIGS. 10 and 11, in order to improve the blowing efficiency of the ventilation fan 100, the tip of the blade 101 of the ventilation fan 100 protrudes from the bell mouth 102, and the filter 103 is provided on the upper and lower surfaces of the bell mouth 102. As shown in FIG. 12, the cover 105 formed by spot welding the front surface portion 106, the upper surface portion 107 and the lower surface portion 108 of the cover 105 at the welding portion T is used. A conventional ventilation fan 100 is also known.
Japanese Patent Laid-Open No. 62-17547

  The above-described kitchen exhaust fan has the following problems. That is, oil or the like cannot be completely collected by the filter or the oil receiver, so that oil may adhere to the blades of the ventilation fan. However, if the tip of the blade 101 of the ventilation fan 100 is protruded from the bell mouth 102, when the blade with the oil attached is rotated, the left and right sides are oiled by the centrifugal force of the blade from the opening S as shown in FIG. R is scattered in the left-right direction of the ventilation fan 100. Furthermore, since the cover of the ventilation fan also has a net-like shape or punching hole portion in order to give air permeability, oil will be scattered from the punching hole portion to the outside. For this reason, the surroundings of the ventilating fan 100 such as a wall where the ventilating fan 100 is installed are contaminated with oil, and the appearance around the ventilating fan is impaired.

  Further, in the ventilating fan as shown in FIG. 12, in order to spot weld the front surface portion 106 and the upper surface portion 107 and the front surface portion 106 and the lower surface portion 108, a welding mark (welding) of spot welding is formed on the front surface 106 of the cover 105. Part) Since T is exposed, the appearance is impaired and the appearance is not good.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a ventilating fan for a kitchen that does not scatter oil around the ventilating fan and has a good appearance of the ventilating fan.

  In order to solve the above problems and achieve the object, the kitchen fan of the present invention is configured as follows.

  A propeller fan that is rotationally driven by a motor, a bell mouth formed with an opening surrounding the propeller fan, and a front side of the front of the bell mouth in the air blowing direction from the tip of the blade of the propeller fan. A filter that covers at least a portion of the filter, and a cover that covers the entire filter and that has a plurality of holes in front and in the horizontal direction of the filter. The tip of the blade protrudes from the front surface of the bell mouth. The cover further includes a wall surface portion provided on a side surface of the cover corresponding to a position from a front surface position of the bell mouth to a tip position of the blade.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the ventilation fan for kitchens where the external appearance is good, without scattering oil around.

  A kitchen ventilation fan 1 according to a first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, F indicates the flow of room air, and G indicates the flow of air discharged through the kitchen ventilation fan 1.

  As shown in FIGS. 1 to 6, a kitchen ventilation fan 1 includes, for example, a main body 10 fixed to a wall surface of a building, a propeller fan 20 provided on the main body 10 for exhausting indoor air, and a main body 10, a bell mouth 30 provided to surround the propeller fan 20, a filter 40 provided in the air blowing (intake) direction of the propeller fan 20, and a cover 50 provided to cover the filter 40. And an oil reservoir 70 that receives oil contained in the intake air via the filter 40. The outdoor side (the cover 50 side) is the rear side and the ventilation (exhaust) direction, and the indoor side (the propeller fan 20 side) is the intake side and the front side.

  The main body 10 includes a ventilation member 11 formed of a plurality of louvers that can be opened and closed, a decorative screw 12 provided on the lower surface of the main body 10 for fixing the cover 50, and a cover 50 provided on the upper surface of the main body 10. And a claw portion 13 for combining. The ventilation member 11 opens and closes to form a ventilation path between the room and the outdoor when the kitchen ventilation fan 1 is used, and closes the ventilation path between the room and the outdoor by closing the ventilation member 11 when not used.

  The propeller fan 20 includes a rotary motor 21 that is fixed to the main body unit 10 and rotated by an external power source, and a fan unit 22 that is provided on the rotary motor 21 via a rotary shaft (not shown). The fan unit 22 includes, for example, a propeller 24 provided with a plurality of blades 23 (for example, three), and a fixing member 25 that fixes the propeller 24 to a rotation shaft. Further, as shown in FIG. 3, at least a part of the fan portion 22 is provided so as to protrude from the front surface of the bell mouth 30 described later.

  The bell mouth 30 is located on the front surface side, and includes a base portion 31 fixed to the main body portion 10, an opening portion 32 connected to the base portion 31 and provided around the propeller fan 20, and a filter 40 provided on the front surface of the base portion 31. And a base fixing portion for detachably attaching the base fixing portions. The base fixing portions are provided in pairs substantially symmetrically with respect to the center line of the bell mouth 30 in the vertical direction.

  The opening part 32 is formed in a mortar shape so as to surround the fan part 22, and has a shape that extends from the rotary motor 21 toward the filter 40.

  As shown in FIG. 8, the base fixing part is provided on the left and right above the base part 31 and is used, for example, as a hooking part 34, and on the left and right below the base part 31 as shown in FIG. And a fastening screw 35 having a portion. The stepped screw 34 is formed so as to have a gap larger than the thickness of a flange portion 42 described later between the seating surface of the stepped screw 34 and the base portion 31 by being screwed into the base portion 31 and causing bottom projection. . The fastening screw 35 is provided below the base portion 31 and is formed to be rotatable by, for example, a user picking the knob. Here, a configuration may be adopted in which the fastening screw 35 is not detached from the base portion 31 when the fastening screw 35 is fully opened.

  The filter 40 includes a filter fixing portion 41 that engages with a base fixing portion provided in the base portion 31, a flange portion 42 that has the filter fixing portion 41, and a punching hole portion 80 that will be described later. And a filter part 43 for filtering air taken in from the room, and a blocking part 44 provided between the flange part 42 and the filter part 43 so as to be able to block (shield) oil. ing.

  Here, the filter fixing portion 41 and the flange portion 42 are provided in a pair substantially symmetrically with respect to the vertical center line of the filter 40 (bell mouth 30). The blocking part 44 is provided in a range from the base part 31 to the tip of the blade 23 in a side view. In addition, the flange portion 42 is provided with guide characters 45 so that the vertical direction of the filter 40 can be seen at a glance as shown in enlarged views in FIGS. Further, the filter 40 is formed in a shape having nothing above and below, that is, a shape having openings on the top and bottom when the filter 40 is attached to the bell mouth 30.

  The filter fixing portion 41 is provided with a polishing hole 46 at a position corresponding to the above-described stepped screw 34 and the fastening screw 35 of the flange portion 42. The mortar-like hole 46 has a lower circle 47 whose lower side is a circle larger than the seating surfaces of the stepped screw 34 and the fastening screw 35, and an upper circle which is smaller than the seating surfaces of the stepped screw 34 and the fastening screw 35. Each has an upper circle 48 formed.

  As shown in FIGS. 5 and 6, the cover 50 includes a front cover 52 formed by the punching hole portion 80 and the wall surface portion 51, a dish-shaped upper surface cover 53, and a dish-shaped lower surface cover 54. 52, the upper surface cover 53, and the lower surface cover 54 have welding margins 55, respectively, and a connecting member 56 for connecting these welding margins 55 by spot welding.

  The front cover 52 includes a front surface portion 57 formed by the punching hole portion 80 and a side surface portion 58 provided on the left and right sides, the front side being the punching hole portion 80 and the rear side being formed by the wall surface portion 51. Further, the front cover 52 is formed with a U-shaped horizontal step surface by a front surface portion 57 and a side surface portion 58. On the upper and lower sides of the front surface portion 57, welding margins 55A are provided that are folded at substantially right angles. On the upper and lower sides of the side surface portion 58, welding margins 55 </ b> B are provided that extend slightly upward and downward and are folded back at a substantially right angle inside.

  The upper surface cover 53 is formed in a dish shape having a side wall 59 having a height substantially the same as the height of the welding margin 55B (the length extending vertically) on the front and side portions. Further, a welding margin 55C for spot welding is provided in front of the upper surface of the upper surface cover 53. Moreover, the engagement hole 60 for hooking on the nail | claw part 13 provided in the main body part 10 upper surface is provided.

  The lower surface cover 54 has a side wall 61 having a height substantially equal to the height of the welding margin 55B (length extending vertically) at the front and side portions, and oil or the like flows into the oil reservoir 70 on the lower surface. It is formed in a dish shape having an inflow hole 62 and a retaining portion 63 fixed to the decorative screw 12 provided on the lower surface of the main body portion 10. The retaining portion 63 is formed so that the thread portion of the decorative screw 12 can be inserted by sliding. Further, a welding margin 55D for spot welding is provided in front of the lower surface of the lower surface cover 54.

  The connecting member 56 is formed by bending the plate material twice at a substantially right angle, thereby forming a lower step surface 64, a vertical surface 65 extending upward from the lower step surface 64 substantially at a right angle, and a vertical surface 65 to the lower step surface 64. Is formed in a two-step shape having an upper step surface 66 provided substantially perpendicular to the opposite direction. The lower surface 64 is provided with a welding margin 55E on which the bottom surface of the welding margin 55A and spot welding are performed. The vertical surface 65 has a height at which the upper step surface 66 contacts the lower surface of the upper surface cover 53 when the welding margin 55A and the welding margin 55E are welded. The upper surface 66 is provided with a welding margin 55F on which the bottom surface of the welding margin 55C and spot welding are performed. The lower step surface 64 is formed in a shape having a longer width in the blowing direction than the upper step surface 66. In addition, it can be applied by making the lower step surface 64 and the upper step surface 66 into the same shape. Further, for convenience of explanation, the lower step surface 64 and the upper step surface 66 are used, but this is a position when used on the upper side of the cover 50, and when used on the lower side of the cover 50, the upper step surface 66 is placed on the lower step and the lower step surface. It arrange | positions so that 64 may be located in an upper stage.

  As described above, on the upper surface of the cover 50, the welding margin A of the front cover 52 and the welding margin 55E of the connecting member 56, the welding margin B of the front cover 52 and the welding margin 55C of the upper surface cover 53, and the welding margin 55F of the connecting member 56. And the welding margin 55C of the upper surface cover 53 is spot welded.

  Similarly, on the lower surface of the cover 50, the welding margin A of the front cover 52 and the welding margin 55E of the connection member 56, the welding margin B of the front cover 52 and the welding margin 55D of the lower surface cover 54, the welding margin 55F of the coupling member 56, and The welding margin 55D of the lower surface cover 54 is spot welded. The cover 50 is formed by welding in this way.

  The oil reservoir 70 has, for example, a dish-shaped recess, is slid onto the threaded portion of the decorative screw 12, and is fixed to the main body 10 by screwing the decorative screw 12 into the main body 10 (not shown). )have.

  As shown in FIG. 7, the punching hole 80 used for the filter 40 and the cover 50 is formed of a material having a plurality of punching holes 81 obtained by punching holes in a plate material such as metal or resin. The room air is sucked through the cover 50 and the punching hole 80 of the filter 40. The diameter and material of the punching hole 81 used for the filter 40 and the cover 50 may be the same or different.

  In the kitchen ventilation fan 1 configured as described above, power is supplied to the rotary motor 21 from, for example, an external power source. When cooking or the like is performed in the kitchen, the rotary motor 21 is activated by turning on a ventilation fan switch (not shown). Further, when the ventilation fan switch is turned on, the ventilation member 11 moves to the opening position to form a ventilation path.

  As the rotary motor 21 rotates, the fan unit 22 rotates and forcibly exhausts (exhausts) indoor air including oily smoke generated during cooking to the outside. The indoor air F passes through the cover 50, the filter 40, the opening 32 and the fan portion 22 of the bell mouth 30, and the ventilation member 11, thereby releasing the air G containing oily smoke and the like to the outside. At this time, since the fan part 22 or a part of the fan part 22 protrudes from the front surface of the bell mouth 30, air blowing (discharge) can be performed with high efficiency.

  Most of the oil in the smoke generated in the room is collected by the filter 40 and the cover 50, but fine oil particles pass through the filter 40 and the cover 50 and adhere to the fan unit 22. At this time, the oil adhering to the fan part 22 gradually moves around the tip of the blade 23 from the centrifugal force applied to the fan part 22. When the oil accumulates above a certain level, the oil is detached from the tip of the blade 23 and the like. When the rotary motor 21 is stopped, no centrifugal force is applied to the fan unit 22, so that the oil drops on the lower cover 54 and moves from the inlet hole 62 of the lower cover 54 to the oil reservoir 70. . As a result, oil accumulates in the oil reservoir 70.

  When the rotary motor 21 is operating, centrifugal force is applied to the fan unit 22, so that the oil is separated (scattered) from the tip of the blade 23 in the rotational direction and in any direction of 360 °. At this time, when the oil is separated from the blades 23 toward the upper and lower upper surface covers 53 and 54, the oil adheres to the upper surface cover 53 and the lower surface cover 54.

  When oil adheres to the upper surface cover 53, when the oil accumulates to a certain level or more, the oil drops to the lower surface cover 54 due to its own weight, or the oil moves to the lower surface cover 54 through the filter 40, the cover 50, etc. . The oil dropped (or moved) onto the lower surface cover 54 moves from the inflow hole 62 to the oil reservoir 70. When oil adheres to the lower surface cover 54, the oil moves from the inflow hole 62 to the oil reservoir 70.

  When the oil leaves the blade 23 in the left-right direction, the oil scatters to the blocking portion 44 of the filter 40 located on the side surface of the blade 23. And the oil adhering to the interruption | blocking part 44 falls to the lower surface cover 54 with the dead weight. The oil that has moved to the lower surface cover 54 moves from the inflow hole 62 to the oil reservoir 70.

  As described above, even if the oil adhering to the blade 23 is separated from the blade 23 by centrifugal force in any direction of 360 °, the oil moves from the inflow hole 62 of the lower surface cover 54 to the oil reservoir 70, and the oil reservoir 70. Accumulated in

  As a result, even if the kitchen ventilation fan 1 is used, oil is not scattered around the kitchen ventilation fan 1 and the vicinity of the kitchen ventilation fan 1 is hardly contaminated with oil.

  When the kitchen ventilation fan 1 has been used for a long time, or when oil or the like adheres to the filter 40 or the cover 50 depending on the usage situation, ventilation efficiency may be reduced, or odor may be generated during use. There is. This is because the oil has a high viscosity. In particular, the oil once becomes smoke during cooking or the like, and the oil attached to the filter 40 or the cover 50 has a higher viscosity than the oil used for normal cooking or the like. Dust contained in the air blown from the propeller fan 20 or dust entering from the outside may adhere to the highly viscous oil attached to the filter 40 or the cover 50. When this deposits, the punching hole 81 of the punching hole 80 included in the filter 40 and the cover 50 may be clogged. When the filter 40 and the cover 50 are clogged, the ventilation efficiency is lowered. For this reason, periodic cleaning of the kitchen ventilation fan 1 is required.

A method for detaching the cover 50 and the filter 40 of the kitchen ventilation fan 1 performed during cleaning or the like will be described.
As shown in FIGS. 4, 8 and 9, at the time of shipment or installation of the kitchen ventilation fan 1, the base portion 31 and the filter 40 of the main body portion 10 and the main body portion 10 and the cover 50 are engaged. The base part 31 and the filter 40 are fixed by engaging the base fixing part and the filter fixing part 41. As shown in FIG. 8, the upper base fixing part and the filter fixing part 41 have a stepped screw 34 in which the upper circle 48 reaches the gap between the seat surface and the base part 31 and the upper circle 48 is hooked. Yes. On the other hand, as shown in FIG. 9, in the lower base fixing portion and the filter fixing portion 41, the screw portion of the tightening screw 35 is hooked on the upper circle 48 of the polishing hole 46, and the tightening screw 35 is further screwed. It is fixed by joining.

  The main body 10 and the cover 50 are provided on the lower surface of the main body 10 by engaging (hanging) the engagement holes 60 provided in the upper surface cover 53 of the cover 50 with the claw portions 13 provided on the upper surface of the main body 10. The fastening portion 63 is inserted into the decorative screw 12 and the decorative screw 12 is screwed to be fixed. An oil reservoir 70 is also fixed between the lower surface of the main body 10 and the retaining portion 63 and the decorative screw 12 seating surface.

  When disassembling (separating) the main body unit 10 and the filter 40 and the cover 50 configured as described above, the cover 50 and the filter 40 are removed in this order. First, the decorative screw 12 is loosened and the oil reservoir 70 is removed. At this time, the decorative screw 12 may not be completely removed. This is because the fixing portion of the oil reservoir 70 is formed so that the screw portion of the decorative screw 12 can be inserted by sliding.

  After loosening the decorative screw 12 and removing the oil reservoir 70, the cover 50 is tilted away from the main body 10 with the claw portion 13 as a fulcrum, for example. When the lower surface cover 54 is positioned forward of the front surface of the filter 40, the cover 50 is lifted upward in this state. Thereby, the engagement hole 60 is detached from the claw portion 13, and the cover 50 can be detached from the main body portion 10.

  Next, the filter 40 is detached from the main body 10. First, since the filter 40 is fixed by the fastening screw 35, the fastening screw 35 is loosened. After loosening the fastening screw 35, the filter 40 is moved upward (lifted). By moving the filter 40 upward, the stepped screw 34 and the tightening screw 35 move from the upper circle 48 to the lower circle 47 of the mortar-like hole 46. As described above, since the heads (seat surfaces) of the stepped screw 34 and the fastening screw 35 are smaller than the lower circle 47, the filter 40 is moved forward in this state. Can be removed.

  Thus, the filter 40 and the cover 50 can be easily detached by simply loosening the fastening screw 35 and the decorative screw 12 respectively. Further, it is not necessary to completely remove the fastening screw 35 and the decorative screw 12, and there is no possibility of losing them. Here, the procedure for removing the filter 40 and the cover 50 from the main body 10 is shown, but when the filter 40 and the cover 50 are attached to the main body 10, the above procedure may be reversed.

  Further, the cover 50 is shaped so that spot welding is not exposed to the outside by spot welding on the upper surface (upper surface cover 53) and the lower surface (lower surface cover 54) of the cover 50 by using the connecting member 56. ing. The upper surface of the cover 50 cannot be seen by installing the kitchen ventilation fan 1 on the wall surface. Further, the lower surface of the cover 50 is not exposed because it is hidden by the oil reservoir 70. For this reason, the appearance of the appearance is good.

  As described above, according to the kitchen ventilation fan 1 according to the present embodiment, the fan portion 22 has a shape protruding forward from the bell mouth 30, and the blocking portion 44 of the filter 40 is formed on the side surface of the protruding fan portion 22. With the configuration having the above, the ventilation (ventilation, discharge) efficiency of the propeller fan 20 can be improved. Furthermore, even if the oil adhering to the blades 23 is scattered by the centrifugal force of the fan unit 22, the cover 50 and the filter 40 can prevent the surroundings of the kitchen ventilation fan 1 from being contaminated with oil.

  In addition, the flange portion 42 of the filter 40 has a polishing hole 46, and the stepped screw 34 and the fastening screw 35 are engaged and held in these holes, whereby the filter 40 can be easily attached and detached. Become. Thereby, it becomes possible to improve work efficiency, for example, when cleaning the kitchen ventilation fan 1. Further, because of this structure, it is not necessary to remove the stepped screw 34 and the tightening screw 35 from the main body 10, so that the stepped screw 34 and the tightening screw 35 can be prevented from being lost when the filter 40 is detached. it can.

  Furthermore, the appearance of the external appearance can be improved by setting the spot of the spot welding of the cover 50 to a position where it cannot be seen from the outside. Furthermore, in order to weld through the connecting member 56, it is possible to cope with some dimensional errors of the upper surface cover 53, the front cover 52, and the lower surface cover 54 by shifting the welding position of the connecting member 56, etc. It also facilitates manufacturing.

  The present invention is not limited to the above embodiment. For example, in the above-described example, in order to prevent the oil from scattering, the filter 40 has the blocking portion 44. However, instead of the blocking portion 44, a punching hole portion 80 is used, and a fiber such as a cloth is formed on the upper surface thereof. The same effect can be obtained by using an oil filter made of resin or resin in a range protruding from the bell mouth 30 of the fan unit 22. Moreover, since it is only necessary to replace this filter when cleaning the filter, the cleaning efficiency is also improved. Further, although the cover 50 is formed by spot welding, this may be formed by using, for example, a countersunk screw or the like. By using a countersunk screw, it can be disassembled during cleaning, so that it is possible to clean up the details. And it can also be set as the structure which cannot visually observe a countersunk screw from the outside by arrange | positioning a countersunk screw in the same position as a spot welding part. In addition, various modifications can be made without departing from the scope of the present invention.

The perspective view which shows the ventilation fan for kitchens which concerns on one embodiment of this invention. The perspective view which shows the structure of the ventilation fan for the same kitchen. Explanatory drawing which shows the structure of the main-body part and filter which are used for the ventilation fan for the same kitchen. The perspective view which shows the main-body part and a filter. The perspective view which shows the structure of the cover used for the ventilation fan for the same kitchen. Sectional drawing which shows the welding part of the cover. The perspective view which expands and shows the punching hole part used for the filter and cover. The perspective view which shows the upper engagement of the 1st fixing | fixed part and 2nd fixing | fixed part which were provided in the filter. The perspective view which shows the downward engagement of the 1st fixing | fixed part and the 2nd fixing | fixed part. Explanatory drawing which shows an example of the conventional ventilation fan for kitchens. The perspective view which shows an example of the conventional ventilation fan for kitchens. The perspective view which shows the cover used for the conventional ventilation fan for kitchens.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Kitchen ventilation fan, 10 ... Main-body part, 11 ... Ventilation member, 12 ... Cosmetic screw, 20 ... Propeller fan, 21 ... Rotation motor, 22 ... Fan part, 23 ... Blade | wing, 24 ... Propeller, 25 ... Fixing member, 30 ... Bell mouth, 31 ... Base part, 32 ... Opening part, 34 ... Stepped screw, 35 ... Fastening screw, 40 ... Filter, 41 ... Filter fixing part, 42 ... Flange part, 43 ... Filter part, 44 ... Shielding part , 50 ... cover, 51 ... wall surface part, 52 ... front cover, 53 ... top cover, 54 ... bottom cover, 55 ... welding, 70 ... oil reservoir, 80 ... punching hole, F, G ... air flow.

Claims (3)

A propeller fan that is rotationally driven by a motor;
A bell mouth formed with an opening surrounding the propeller fan;
A filter that covers at least a part of the front surface in the air blowing direction of the bell mouth from the front end of the blades of the propeller fan, and
Covering the entire filter, and a cover having a plurality of holes in the front and horizontal direction of the air flow of the filter,
The tip of the blade is arranged to protrude from the front surface of the bell mouth,
The above-mentioned cover is further provided with the wall part provided in the side of the above-mentioned cover corresponding to from the front position of the above-mentioned bell mouth to the tip position of the above-mentioned feather. A flange portion provided on each side surface of the filter and disposed opposite to the front surface of the bell mouth;
Each of these flange portions is provided in at least two locations above and below the flange portion, and is formed by connecting round holes with different diameters,
A hook part provided on the front surface of the bell mouth, inserted on the large diameter side of the scouring hole provided above the flange part, and engaged with the small diameter side of the scouring hole,
The flange portion is provided on the front surface of the bell mouth and is inserted into the large diameter side of the brush-like hole provided below the flange portion and screwed into the bell mouth on the small diameter side of the brush-like hole. The kitchen ventilation fan according to claim 1, further comprising: a fixing portion formed so as to be fixable. The above cover
A front cover portion that covers the front and horizontal sides of the filter in the blowing direction and has a folded portion formed by being folded back to the filter side at the upper end and the lower end,
An upper cover portion covering the upper side of the filter;
A lower cover portion covering the lower side of the filter;
A plurality of connecting members formed in a step shape by folding the plate material twice;
A fixing means for fixing the folded portion and one horizontal surface of the connecting member, the upper cover portion and the other horizontal surface of the connecting member, and the lower bar portion and the other horizontal surface of the connecting member; The kitchen ventilation fan according to claim 1.

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