HK1183934A1 - An exhaust hood - Google Patents

Abstract

A range hood with minimal pressure loss and good oil collecting efficiency is provided. The range hood (1) is provided with: a fan (60) that generates a flow of air; a filter (10) that exists on the flow path of the flow of air and is upstream from the fan (60), and has holes that allow the flow of air to pass through; an electric motor (20) that rotates the filter (10); an oil collecting member (30) that surrounds the periphery of the filter; and a control unit (90) that controls the rotation of the fan (60) and the electric motor (20). The control unit (90) sometimes allows the fan (60) and the electric motor (20) to simultaneously rotate.

Description

Smoke exhaust ventilator

Technical Field

The present invention relates to a range hood that captures oil from oil smoke generated by cooking, and more particularly to a range hood.

Background

A hood installed in a kitchen or the like sucks in steam, oil smoke, and the like generated by cooking performed below the hood together with an air flow generated by a fan, and discharges the oil smoke and the like together with the sucked air to the outside or the like. However, the direct discharge of oil contained in oil smoke to the outside of the room or the like is not environmentally friendly, and the oil adheres to equipment such as a fan and a duct generally located downstream of the range hood in the air flow path, which requires a large amount of labor and cost for maintenance such as cleaning and the like, and promotes the deterioration of the equipment.

Therefore, the range hood needs to have a filter having high trapping efficiency, and trap and collect most of the oil contained in the oil smoke; on the other hand, however, the oil adhered to the filter clogs the filter, and causes an increase in ventilation resistance, a decrease in trapping efficiency, and poor ventilation, and the user is forced to frequently clean or clean the filter, which requires a lot of labor and time. Therefore, in the prior art, efforts have been made to improve the cleanability of the filter.

For example, patent document 1 discloses a range hood with a filter cleaning function, which includes a filter for trapping soot during cooking and a brush (dirt wiping means) that moves while contacting the surface of the filter, and thereby can remove dirt adhering to the filter without using a large amount of washing water.

Although this type of hood can reduce the burden of cleaning the filter by the user himself, it requires a brush, a motor for driving the brush, a tank for washing water, a spray nozzle, and the like, and the structure of the hood itself becomes large and complicated, and the cost increases. In addition, such a hood does not teach at all a technique for improving the oil capturing efficiency of the filter.

Patent document 2 discloses a technique that can prevent clogging of a filter and reduce the burden of cleaning, and can improve the recovery rate of oil by using a filter. This document discloses a range hood in which a rotatable filter having blades and formed in a substantially circular disk shape for removing oil in exhaust gas is provided on the front side of an exhaust rotary vane, and a passage portion for guiding the exhaust gas flowing through the filter to the exhaust rotary vane and for adhering the oil in the exhaust gas to the inner surface is provided from the filter to the exhaust rotary vane.

This type of hood does not require a large-scale and complicated structure as in patent document 1, but is the same in that oil adhered to the filter during operation of the hood is removed during a period in which the hood is not operating (during stoppage of the hood). Further, although the burden of cleaning the filter by the user himself can be reduced to some extent, the burden of cleaning the downstream portion cannot be said to be reduced compared with a filter that requires much labor when the user cleans the hood by himself because a large amount of oil is splashed on the passage portion provided from the filter to the exhaust rotary vane, that is, the downstream portion of the filter.

[ Prior Art document ]

[ patent document 1] Japanese patent application laid-open No. 2006-292248

[ patent document 2] Japanese patent application laid-open No. 2006-38240

Disclosure of Invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a range hood having a filter which is less susceptible to clogging due to a small pressure loss and which greatly exceeds conventional oil trapping efficiency, and which reduces the burden of cleaning and washing the filter, while reducing the adhesion and sticking of oil to the filter.

Further, the present invention provides a range hood that operates a filter but reduces the influence of the sound of a power source that operates on a user.

The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that high oil trapping efficiency can be obtained with a small pressure loss by moving a filter while operating a fan of a range hood, and that the influence of sound emitted from a power source or the like on a user can be reduced by controlling the power source that moves the filter, thereby completing the present invention.

In order to solve the above problem, a range hood is provided, which is characterized by comprising: a fan generating an air flow; a filter on an upstream side of the fan in a flow path of the air flow, the filter having a hole through which the air flow passes; a motor for rotating the filter; an oil trapping member surrounding the filter; and a control portion that controls rotations of the fan and the motor, wherein the control portion is capable of rotating the fan and the motor simultaneously.

Accordingly, by rotating the filter simultaneously with the fan, noise generated by the motor for rotating the filter, wind noise generated by the rotation of the filter, and the like can be made unnoticeable to the user. Further, by simultaneously rotating the fan, that is, the operation of the hood and the rotation of the filter at least one point of time, the amount of oil adhering to the filter can be reduced, and the adhesion of oil to the surface of the filter can be prevented.

In addition, the control unit may control such that a time at which rotation of the fan is started and a time at which rotation of the motor is started are the same, and/or a time at which rotation of the fan is ended and a time at which rotation of the motor is ended are the same.

Accordingly, by simultaneously starting and ending the rotation of the motor and the rotation of the fan, which are power sources for driving the filter, it is possible to provide a range hood in which a user does not notice noise generated by the motor.

In addition, the control unit may control such that a timing at which the rotation of the fan is started is the same as a timing at which the rotation of the motor is started, and the control unit may control such that the rotation of the motor is ended after a predetermined time has elapsed after the rotation of the fan is ended.

Accordingly, by rotating the filter for a while after the operation of the range hood is completed, the oil adhered to the filter can be flown out, and the filter can be maintained in a clean state. In addition, if oil adheres to the filter after the operation of the range hood is completed, the oil sticks to block the filter or causes imbalance, and unnecessary noise is generated at the next start of operation, and this noise can be prevented.

In addition, the control unit may control such that a time at which rotation of the fan is started and a time at which rotation of the motor is started are different from each other, and a time at which rotation of the fan is ended and a time at which rotation of the motor is ended are different from each other.

Accordingly, by independently rotating the fan and the filter, flexible control can be performed.

In addition, the control unit may change a rotation speed of the fan and change a rotation speed of the motor according to the rotation speed of the fan.

Accordingly, when a large amount of oil adheres, the oil can be quickly separated from the filter by applying a stronger centrifugal force, so that clogging of the filter can be prevented, the amount of oil adhering can be reduced, and the filter can be prevented from being rotated at a speed higher than or equal to a required speed when the rotation speed of the range hood is slow.

In addition, the control unit may change the rotation speeds of the fan and the motor in stages.

Accordingly, the rotation speed can be controlled in a strong or weak manner, which is easily recognized by the user.

In order to solve the above problem, a range hood is provided, including: a fan generating an air flow; a filter located on an upstream side of the fan in a flow path of the air flow, the filter having a hole through which the air flow passes; a motor for rotating the filter; an oil trapping member surrounding the filter; and a control unit capable of changing the rotation speeds of the fan and the motor in stages, wherein the control unit does not rotate the motor at a level at which the rotation speed of the fan is minimum.

Accordingly, when the sound accompanying the rotation of the filter is conspicuous, the filter is not rotated, whereby a quiet range hood can be provided.

In addition, the control unit may cause the motor to rotate when the rotation of the fan is completed, when the rotation of the fan is completed only at a level at which the rotation speed of the fan is minimum.

Accordingly, it is possible to provide a range hood in which, after the operation of the range hood is completed, for example, when the user leaves the vicinity of the cooking range, the filter is immediately rotated to separate the adhered oil, the oil is quickly separated from the filter to prevent the filter from being clogged, and the amount of the oil adhered is reduced, and the user who leaves the range hood does not notice noise.

Further, the filter may be provided with a filter rotation control switch for controlling rotation of the motor.

Accordingly, the user himself/herself can flexibly control the rotation of the filter.

As described above, according to the present invention, it is possible to provide a range hood that reduces the adhesion/sticking of oil to a filter and reduces the burden of cleaning/washing the filter, and that has a filter that has a pressure loss that is small and is difficult to clog, which greatly exceeds the conventional oil trapping efficiency.

Further, according to the present invention, it is possible to provide a range hood that reduces the influence of the sound of the power source of the filter operation on the user.

Drawings

Fig. 1 is a sectional view of a first embodiment of a hood of the present invention.

Fig. 2 is a perspective view of the hood according to the first embodiment of the present invention as viewed from below (with the flow rectification plate removed).

Fig. 3 is a front view (a), a side view (B), a top view (C), a bottom view (D), and a cross-sectional view (E) showing a filter and its peripheral portion in the first embodiment of the range hood according to the present invention.

Fig. 4 is an enlarged sectional view showing a filter and its peripheral portion in the first embodiment of the hood according to the present invention (the position of the section is the same as that in fig. 3 (E)).

Fig. 5 is an explanatory view of the operation of the hood according to the first embodiment of the present invention.

Fig. 6 is an enlarged view of the first embodiment of the hood of the present invention.

Fig. 7 is an explanatory diagram showing a variation of the control method of the first embodiment of the hood according to the present invention.

Fig. 8 is a test configuration diagram used in a test for obtaining a relationship between a trapping rate of a filter and adhesion of oil to a downstream member in the first embodiment of the range hood of the present invention and in the related art.

(description of reference numerals)

1: a range hood; 2: a cover opening part; 3: a filter unit; 10: a filter; 11: hole(s)

20: an electric motor; 21: a rotating shaft of the motor; 30: an oil trapping member; 31: oil reservoir

40: a motor mount; 41: a motor mount aperture; 50: mounting a plate; 51: mounting plate opening

52: an extension portion; 60: a fan; 61: a fan housing; 62: an air suction port; 70: rectifying plate

80: a cover portion; 81: an inner panel; 82: a fan box; 90: control unit

91: a filter rotation control switch; d: an exhaust duct; a: air flow

OP: oil content; OL: oil

Detailed Description

Various embodiments of the present invention are described below with reference to the accompanying drawings.

First embodiment

Fig. 1 shows a hood 1 according to a first embodiment of the present invention. The hood 1 has a thin cover 80 for capturing steam, oil smoke, and the like generated by cooking performed below, and the cover 80 has a concave inner panel 81 on the upper side on the inner surface. Cover 80 is connected to fan box 82 near cover opening 2 located substantially at the center, and fan box 82 is connected to exhaust duct D. The fan case 82 has a fan housing 61 inside, and the fan housing 61 has a fan 60 inside that generates an air flow, the fan 60 being a sirocco fan. Air inlet 62 of fan 60 is disposed at cover opening 2 of cover 80. Therefore, if the fan 60 is operated, the hood opening 2 becomes a negative pressure, and air below the inner panel 81 is sucked through the hood opening 2 and discharged to the outside through the exhaust duct D. That is, the cover opening 2 is located upstream of the fan 60 in the flow path of the air flow generated by the fan 60.

The cover opening 2 includes: a mounting plate 50 mounted so as not to form a gap with the inner panel 81, which can serve as an air flow path; a disc-shaped filter 10 having holes through which an air flow passes; a motor 20 having a rotation axis connected to the center of the disc of the filter 10 and rotating the filter 10; a motor mount 40 for mounting the motor 20 on the mounting plate 50; and an oil trap member 30 mounted on the mounting plate 50 and surrounding the outer periphery of the filter 10. Therefore, the range hood 1 is provided with a filter 10 in a rotatable manner, and the filter 10 is positioned on the upstream side of the fan 60 of the air flow in the flow path of the air flow generated by the fan 60 and has a hole through which the air flow passes from below to above as viewed in the drawing.

Cover 80 includes a control unit 90, and control unit 90 controls rotation of motor 20 for rotating filter 10 and rotation of fan 60. In the present embodiment, the control unit 90 is provided on the cover 80, but the present invention is not limited to this, and may be provided at any position of the hood 1 or may be provided outside the hood 1. The control unit 90 controls the fan 60 and the motor 20 to rotate simultaneously. That is, the control section 90 performs control in such a manner that: the motor 20 is rotated at least at one timing when the hood 1 rotates the fan 60 that generates the air flow to catch the soot and the like generated by the cooking. Specifically, rotating the fan 60 or the motor 20 (filter 10) means energizing the fan 60 or the motor 20, and not rotating means deenergizing.

The air below the inner panel 81 contains steam, soot, and the like generated by cooking, and if the fan 60 is operated, the air is sucked through the holes of the filter 10 located on the upstream side of the fan 60 in the hood opening 2, that is, in the flow path of the air flow generated by the fan 60, and passes through the holes. The filter 10 is provided to be rotatable by the motor 20, and if the hood 1 is operated, the motor 20 rotates the filter 10 while the fan 60 generates an air flow. The range hood 1 captures oil contained in the air on the oil capturing member 30 by rotating the filter 10. The method of capture will be described later.

Such a hood 1 can have a high oil capturing efficiency with a small pressure loss, as compared with a measure of improving the oil capturing efficiency by thinning or overlapping a plurality of layers of slits, meshes, or the like using a conventional slotted filter, HEPA filter, or the like. That is, if the oil capture efficiency is improved by thinning the mesh of the slits or overlapping a plurality of layers using a conventional slotted filter, HEPA filter, or the like, the ventilation part of the filter tends to form a complicated flow path, and thus the ventilation resistance tends to be high, whereas in the case of the range hood 1, the oil capture efficiency is improved by the rotation of the filter, and thus the formation of such a complicated flow path is not necessary. Therefore, it is possible to obtain high oil trapping efficiency while maintaining relatively low ventilation resistance as compared with the conventional filter. In addition, the phenomenon that oil is attached to the filter to cause blockage is reduced, thereby reducing the cleaning labor of the filter and preventing the pressure loss from increasing along with the use; further, since almost no oil adheres to the downstream portion of the filter in the air flow path, it is possible to provide a range hood that greatly reduces the burden of cleaning and washing the downstream portion of the filter.

The type of fan of the fan 60 is not particularly limited, and may be another fan such as an axial fan that generates an air flow. Preferably, the sirocco fan used in this embodiment has a high static pressure. A rectifying plate 70 is provided below the cover 80, detachably attached to the cover 80, and having a gap with the cover 80 to improve suction force. Although the hood 1 in the present embodiment includes the rectifying plate 70, the presence of the rectifying plate 70 is not particularly limited and may be optional. In the case where there is no fairing or the fairing is removed, as shown in fig. 2, the user can directly see: an upper concave inner panel 81 as an inner surface of the cover portion 80, an attachment plate 50 attached to the inner panel 81 without a gap, a disk-shaped filter 10, and an oil trapping member 30 attached to the attachment plate 50 so as to surround an outer peripheral edge of the filter 10.

Fig. 2 shows a filter rotation control switch 91 that controls the rotation of the motor 20. As will be described later, the control unit 90 performs various controls on the motor 20 for rotating the filter 10, but in addition to this, the user can flexibly control the rotation of the filter by himself/herself by operating the filter rotation control switch 91. The filter rotation control switch 91 can perform operations such as start of rotation, end of rotation, and change in rotation speed of the motor 20 in accordance with an operation by the operator. As the maintenance operation of the filter 10, an operation of automatically stopping the motor 20 after only rotating for a predetermined time may be performed.

In the present embodiment, the filter 10 is formed of a thin plate formed in a disc shape, but is not limited thereto, and for example, the filter may be cylindrical. In this case, the cylindrical filter rotates the drum by connecting a rotary shaft of a motor to a central axis of the drum, and has a hole through which an air flow passes on a side surface of the drum. The airflow is configured to pass from the outside to the inside of the side surface of the cylinder. Further, the oil trap member is provided so as to surround the side surface of the cylinder. The cylinder can be placed horizontally or vertically. When the tube is placed horizontally, the oil trap member has an opening that opens below the intake air and an opening that opens to allow air to flow to the fan side. In the case where the cartridge is erected, the filter is not opened at the bottom surface of the cartridge because the air flow is sucked from the side surface of the cartridge, and in addition, the oil trapping member is provided so as to surround the entire side surface of the filter. Since a thin range hood can be provided with a simple structure, it is preferable to form a filter formed of a disk-shaped thin plate as in the present embodiment.

In the present embodiment, the portions other than the holes on the surfaces of both sides of the filter 10 are flat and smooth surfaces without projections or projections and recesses, but the present invention is not limited to this, and projections such as lugs together with slits (holes) may be provided as in a normal notch filter. If the filter has a smooth surface as in the present embodiment, the air flow resistance of the air flow over the filter is further reduced, and the rotation resistance of the filter is also reduced, so that a motor for rotating the filter is sufficient only to have a small torque. Further, since the filter does not have a projection such as a lug, a range hood with low noise of cutting air can be provided. In addition, according to this, it is easy to rotate the filter at high speed. Further, since almost all of the oil is captured by the surface of the filter, there is almost no phenomenon of capturing the oil on the side surfaces of the pores of the filter, and therefore, the clogging of the pores of the filter by the oil is further reduced, and since there is no projection such as a lug, cleaning and washing of the filter itself becomes easy.

Fig. 3 and 4 show the filter 10 of the hood 1 and its peripheral portion (hereinafter referred to as a filter unit). The filter unit 3 includes: a mounting plate 50 mounted on the cover opening 2; a disc-shaped filter 10 having holes through which an air flow passes; a motor 20 having a rotation axis connected to the center of the disc of the filter 10 and rotating the filter 10; a motor mount 40 for mounting the motor 20 to the mounting plate 50; and an oil trapping member 30 mounted on the mounting plate 50 and provided so as to surround the periphery of the filter 10.

The attachment plate 50 is a substantially square flat plate having a circular attachment plate opening 51 at the center. In the present embodiment, the periphery of the flat plate has a curvature and is bent upward, but the present invention is not limited thereto, and the flat plate may be configured to be attached to the cover opening 2 of the inner panel 81. The mounting plate 50 and the cover opening 2 are mounted without forming a gap or the like, and the air flow does not pass through the mounting portion. Therefore, the mounting plate opening 51 serves as the only portion through which the air flow generated by the fan 60 passes, and the mounting plate opening 51 serves as a flow path for the air flow generated by the fan 60.

The motor mount 40 is provided on the downstream side of the mounting plate 50 with respect to the airflow so as to straddle the mounting plate opening 51. The motor mounting member 40 has a hole 41 for allowing the rotary shaft 21 of the motor 20 to pass therethrough at a substantially central portion thereof, and has an attachment portion for mounting to facilitate mounting to the mounting plate 50. The motor mount 40 is attached to the attachment plate 50 such that the hole 41 is centered on the attachment opening 51 in a plan view.

The motor 20 has a rotating shaft penetrating through the hole 41 of the motor mount 40 from above to below (from the downstream side to the upstream side of the air flow) as viewed in the drawing, and the motor 20 is fixed to the motor mount 40. The rotating shaft 21 of the motor 20 is centered on the circular mounting plate opening 51 in plan view.

The filter 10 is detachably attached to a tip portion of a rotary shaft 21 of the motor 20 such that a surface of the filter 10 is perpendicular to the rotary shaft 21. The outer shape of the filter 10 is circular, and the filter 10 is mounted on the rotary shaft 21 of the motor 20 positioned at the center of the circular mounting plate opening 51 at the center of the filter 10, so that the outer shape of the filter 10 and the outer shape of the mounting plate opening 51 are concentric circular. In the present embodiment, the extension 52 is provided in the attachment plate opening 51, so that the diameter of the filter 10 is larger than the diameter of the attachment plate opening 51. The extending portion 52 extends inward from the inner wall of the oil content capturing member 30, i.e., toward the rotation shaft of the motor 20, at the upstream end of the oil content capturing member 30. The extension 52 is preferable because it can increase the proportion of oil that can be trapped in the passage holes, and can provide a range hood with high oil trapping efficiency.

The filter 10 is positioned below the lower surface of the mounting plate 50, i.e., on the upstream side of the air flow, when viewed from the front. Therefore, the oil trap member 30 is attached to the attachment plate 50 so as to surround the outer periphery of the filter 10. The distance between the outer periphery of the filter 10 and the inner wall of the oil trapping member 30 needs to be larger than 0 in order to prevent the contact therebetween, but is preferably as small as possible in order to prevent oil leakage. In this example, it is about 2.5 mm. The oil trap member 30 is provided with an oil reservoir 31 at a lower end. The oil collided with and thrown away from the upstream side surface of the filter 10 hits the inner wall of the oil trap member 30, and the oil reservoir 31 is a place where the oil is stored.

The height of the hood 1 includes the height of the cover 80 and the height of the fan box 82, but the height of the fan box 82 is substantially defined by the height of the fan 60, the height of the cover 80 is defined by the sum of the height of the filter unit 3, that is, the height from the upper end of the motor 20 to the lower end of the oil content capturing member 30, and the depth (height) of the recess of the inner panel 81 for capturing air containing oil or the like. A depth (height) of the recess to some extent is required in order to capture air containing oil or the like, and therefore reducing the height of the filter unit 3 is important for reducing the overall height of the hood 1 and providing a slim hood. In the present embodiment, the filter unit 3 is thin and preferable because the filter 10 is formed of a thin plate formed in a disk shape.

Fig. 5 and 6 are diagrams illustrating an effect of trapping oil components accompanying an air flow in the hood 1. Fig. 5 shows the action of the air flow of the entire range hood 1. The hot air a rises toward the hood 1 together with steam, soot, and the like generated by cooking performed below the hood 1. If the hood 1 starts to operate and the fan 60 starts to rotate, the fan 60 generates an air flow in a direction from below to above as viewed in the drawing. Then, the air rising to the vicinity of the flow regulating plate 70 is sucked in from between the flow regulating plate 70 and the inner panel 81, and then is sucked into the air inlet 62 of the fan 60 in the fan casing 61 through the hole 11 of the filter 10. Then, the air is discharged from the fan box 82 to the exhaust duct D.

The number of revolutions Per unit time of the filter 10 depends on the opening state of the pores of the filter, but may be at least 230rpm (Rotation Per Minute). When the filter 10 is rotated at a high speed, the surface (the portion without the holes 11) of the filter 10 drags the air in contact with the surface by friction, and this motion is also transmitted to the nearby air by the viscosity of the air, whereby the motion of the air is generated near the surface of the filter 10, and the motion of the air becomes a vortex shape centering on the rotation axis due to the rotation motion of the filter 10.

Such swirl-like air movement is generated on both sides of the filter 10, i.e., both the lower surface and the upper surface of the filter 10, in other words, both the surface of the filter 10 on the upstream side and the surface of the filter 10 on the downstream side of the air flow a. In the present embodiment, since the air flow a generated by the fan 60 flows through the holes 11 of the filter 10 from below upward as viewed in the drawing, the movement of the swirling air generates a spiral air flow which is dragged away from the filter 10 toward the outer peripheral edge of the filter 10 on the downstream side of the filter 10, and is sucked away from the air inlet 62 by the fan 60. On the other hand, on the upstream side of the fan 10, the swirling air moves to form an air layer having a high density along with the swirling flow toward the outer periphery of the filter 10 while being pressed against the surface of the filter 10.

Fig. 6 shows the effect of the air flow on the filter unit 3. The oil OP1 generated during cooking or the like flows together with the air flow a and reaches the vicinity of the upstream surface of the filter 10. The oil OP2 reaching the vicinity of the upstream surface partially (oil having a small particle size) is a swirling flow toward the outer periphery of the air layer having a high density, and the other portion (oil having a large particle size) collides with the upstream surface of the filter 10 (the portion having no holes 11), and therefore splashes toward the outer periphery of the filter 10. As a result, the oil is captured as the oil OP3 by the oil capturing member 30 provided so as to surround the outer periphery of the disc-shaped filter 10, and is recovered as the oil OL in the oil reservoir 31.

The oil that becomes very fine particles passes through the pores of the filter 10 together with the air flow a, but a part of the oil may collide with the inner wall of the extension 52 or the oil trap member 30 on the downstream side of the filter 10 and be recovered. Part of the oil that cannot be finally recovered adheres to the fan 60, the exhaust duct D, and the like located further downstream, and most of the oil that becomes fine particles having a size that passes through the pores of the filter 10 is directly discharged to the outside along with the airflow a through the exhaust duct D. Therefore, the hood 1 of the present embodiment of the present invention hardly has oil adhered to the upstream portion of the filter 10 in the air flow path, and can significantly reduce the burden of cleaning and washing the fan 60, the exhaust duct D, and the like at the downstream portion of the filter 10.

When the oil component collides with the surface on the upstream side of the filter (the portion having no pores 11), most of the oil component flies in the direction of the outer peripheral edge of the filter, and part of the oil component adheres to the surface. If the rotation speed of the filter is increased, the oil temporarily adhering to the filter surface flies in the outer peripheral direction by the action of centrifugal force. As a result, the oil content adhering to and remaining in the filter of the range hood of the present invention is reduced, and the labor for cleaning the filter itself can be reduced.

The control unit 90 controls the fan 60 to rotate simultaneously with the motor 20. That is, the control unit 90 controls the motor 20 to rotate at least one timing when the fan 60 that generates the air flow is rotated in order to cause the hood 1 to capture the soot generated by cooking or the like. In other words, when the fan 60 rotates to generate an air flow, the control unit 90 rotates the filter 10 by the motor 20. The control unit 90 may control the fan 60 to rotate to generate the air flow when the filter 10 is rotated by the motor 20.

Accordingly, by rotating the filter 10 simultaneously with the fan 60, noise generated by the motor 20 for rotating the filter 10, wind noise caused by the rotation of the filter, and the like can be made unnoticeable to the user. That is, in the case where the filter rotates when the fan stops, since there is no noise generated by the fan, noise generated by the motor, wind noise caused by the rotation of the filter, and the like are conspicuous, but by rotating the filter together with the fan, noise generated by the fan is utilized to swallow noise generated by the motor, wind noise generated by the rotation of the filter, and the like, and thus the noise may be of such a degree that the user does not notice it. Further, by simultaneously rotating the fan 60, that is, the range hood 1 and the filter 10 at least one point of time, the amount of oil adhering to the filter 10 can be reduced, and the adhesion of oil to the filter surface can be prevented.

Fig. 7 is an explanatory diagram showing a modification of the control method of the fan 60 and the motor 20 according to the present embodiment. The time during which the fan 60 and the motor 20 are rotated is indicated by ON (solid line), and the time during which they are not rotated is indicated by OFF (broken line). In the variation 0 of the rotation of the filter, the control unit 90 controls the fan 60 and the motor 20 to rotate simultaneously as described above. In the present modification, the motor 20 (filter 10) rotates at any point in the rotation of the fan 60. The fan 60 may be rotated at any position during the rotation, and the rotation time is not particularly limited.

Fig. 7 shows a conventional range hood as a conventional example. In the conventional example, since the oil component adhered to the filter is removed during the operation of the hood (during the stop of the hood), that is, during the non-rotation of the fan, the function of removing the oil component is turned ON after the fan is turned OFF from ON. Therefore, the present invention is completely different from the conventional example in that the fan 60 and the motor 20 are controlled to rotate simultaneously.

In variation 1 of the rotation of the filter, the controller 90 turns the fan 60 twice ON with one OFF therebetween, that is, turns it in two rotation periods. In the present modification, the rotation period is divided into two times, but the present invention is not limited to this, and the ON and OFF may be repeated several times during the rotation of the fan 60. Accordingly, it is possible to minimize noise generated by the motor, wind noise generated by rotation of the filter, and the like while reducing the amount of oil adhering to the filter.

In variation 2 of the filter rotation, the control unit 90 rotates the motor 20 (filter 10) whenever the fan 60 rotates. That is, the control unit 90 controls the start of rotation of the fan 60 to be at the same time as the start of rotation of the motor 20 and the end of rotation of the fan 60 to be at the same time as the end of rotation of the motor 20. The control unit may control the start of rotation of the fan 60 to be the same as the start of rotation of the motor 20, or the end of rotation of the motor 60 to be the same as the end of rotation of the motor 20. Accordingly, by simultaneously performing the rotation of the motor 20, which is a power source for operating the filter 10, and the start and end of the rotation of the fan 60, it is possible to provide a range hood in which the user does not notice the occurrence of noise in the motor 20.

Of course, as in modification 5, the control unit 90 may interrupt the rotation of the motor 20 during the rotation of the fan 60 by performing control such that the start of the rotation of the fan 60 is at the same time as the start of the rotation of the motor 20 and the end of the rotation of the fan 60 is at the same time as the end of the rotation of the motor 20.

In variation 3 of the rotation of the filter, the control unit 90 controls the rotation of the motor 20 to be ended after a predetermined time has elapsed after the rotation of the fan 60 is ended, while the rotation of the fan 60 is started at the same time as the rotation of the motor 20 is started. That is, the rotation of the fan 60 is the same as in modification 2, but after the rotation of the fan 60 is completed, the motor 20 (filter 10) continues to rotate for a while. Accordingly, the oil adhered to the filter 10 can be flown out after the rotation of the fan 60 is completed, and the filter 10 can be maintained in a clean state, and as a result, the adhesion/sticking of the oil to the filter 10 can be reduced, and the burden of cleaning/washing the filter 10 can be reduced. If oil adheres to the filter 10 after the operation of the range hood is completed, the oil adheres to the filter 10 and blocks the filter 10 or causes imbalance, and unnecessary noise is generated at the next start of operation. Although the control unit 90 may determine how long the motor is rotated after the rotation of the fan 60 is completed as the appropriate predetermined time, it may determine the motor as a long time when the fan strong operation time is long, and determine the motor as a short time when the fan weak operation time is long, for example.

Of course, as shown in modification 6, the control unit 90 may stop the rotation of the motor 20 during the rotation of the fan 60 by performing control such that the start timing of the rotation of the fan 60 and the start timing of the rotation of the motor 20 are the same timing, and performing control such that the rotation of the motor 20 is finished after a predetermined time has elapsed after the end of the rotation of the fan 60.

In variation 4 of the rotation of the filter, the control section 90 performs control in such a manner that: the rotation of the motor 20 is started before the rotation of the fan 60, and after the rotation of the fan 60 is temporarily interrupted, the rotation is started again, and after the rotation of the fan 60 is ended, the rotation of the motor 20 is ended after a predetermined time has elapsed. Accordingly, by rotating the filter 10 at a high speed just before the start of the rotation of the fan 60, the oil remaining on the filter in the previous use can be blown off, and the oil can be captured by the clean filter without clogging. In this case, since the fan 60 starts to rotate after a slight delay from the start of the hood operation, the filter 10 rotates for a short time just before the start of the rotation of the fan 60. In this way, the control unit 90 can control the timing at which the rotation of the fan 60 is started and the timing at which the rotation of the motor 20 is started to be different timings, and the timing at which the rotation of the fan 60 is ended and the timing at which the rotation of the motor 20 is ended to be different timings. Accordingly, by independently rotating the fan and the filter, more flexible control can be performed.

Of course, as in modification 7, the control unit 90 may start the rotation of the motor 20 before the rotation of the fan 60, restart the rotation after the rotation of the fan 60 is temporarily interrupted, and then control the timing at which the rotation of the fan 60 is ended to be the same as the timing at which the rotation of the motor 20 is ended.

In the filter rotation variation examples 8 and 9, the control unit 90 controls the rotation speed of the motor 20 (filter 10) to be varied according to the rotation speed of the fan 60 by varying the rotation speed of the fan 60 per unit time. The rate of change in the rotation speed of fan 60 and the rate of change in the rotation speed of motor 20 may be the same as in modification 8, or may be different as in modification 9. Accordingly, when a large amount of oil adheres, a stronger centrifugal force is applied to quickly fly the oil off the filter 10 to prevent clogging of the filter 10, thereby reducing the amount of oil adhering and preventing the filter 10 from rotating at a high speed equal to or higher than a desired speed when the rotation speed of the range hood is slow. As in modification 8, control unit 90 may change the rotation speeds of fan 60 and motor 20 in stages. Accordingly, the rotation speed can be controlled to be as strong or weak as the user can easily distinguish. The rotation speed of strong, medium, or weak is a relative rotation speed, and does not mean an absolute rotation speed.

Generally, a high rotation speed of the fan is selected for cooking which generates much oil smoke. Therefore, the faster the rotation speed of the fan, the more the soot is generated. That is, the faster the rotation speed of the fan, the more the amount of oil adhering to the filter 10 increases, and the more rapid clogging occurs. Therefore, by increasing or decreasing the number of revolutions per unit time of the filter 10 in accordance with the number of revolutions of the fan, it is possible to rotate the filter 10 at a higher speed to apply a stronger centrifugal force when the oil is deposited in a large amount, to quickly fly the oil out of the filter 10, to prevent the filter 10 from being clogged, and to prevent the filter 10 from rotating at a high speed equal to or higher than a required speed when the number of revolutions of the fan is slow.

Table 1 shows the pore size (mm) and the relationship between the rotational speed (rpm) and the capturing rate of the filter in this example. The measurement of the capture rate was carried out in four types of pore diameters of 0.75mm, 1mm, 1.5mm, and 2 mm. When the rotation speed of the filter was 0rpm, the pore size was lower than 70%, which is the best trapping rate in the conventional filter, and it was found that the trapping efficiency was not high in the filter which did not rotate.

On the other hand, if the filter is rotated at 1000rpm, the capture rate of the filter having a pore size of 2mm, which is the lowest capture rate, is 77%, which exceeds the capture rate of the conventional best filter. Further, as the pore diameter was reduced to 1.5mm, 1mm and 0.75mm, the trapping rate was further gradually increased to 80%, 86% and 88%. In addition, if the filter rotation speed is set to 1500rpm, the capture rate gradually becomes higher to 84%, 86%, 91%, 93% as the pore size becomes smaller to 2mm, 1.5mm, 1mm, 0.75 mm. In addition, if the filter speed is set to 2000rpm, as the pore size is reduced to 2mm, 1.5mm, 1mm, the capture rate becomes 88%, 90%. Therefore, the range hood of the present invention captures oil contained in air by rotating the filter while generating an air flow by the fan. In addition, if the number of revolutions per unit time of the filter is increased or the pore size is decreased, high oil catch efficiency can be obtained.

[ Table 1]

Fig. 8 is a test configuration diagram used in a test for obtaining a relationship between the trapping rate of the filter and the adhesion of oil to a downstream member such as a fan or a duct in the range hood using the slotted filter of the present example and the conventional type. In order to confirm the state of oil adhesion to the downstream member from the difference in the trapping rate in the filter by using the difference in the trapping rate depending on the pore diameter of the filter of the present example, a test was performed as follows.

The test method is as follows. A range hood equipped with the filter of the present invention and the like was placed 800mm above the temperature-controllable heating plate. On a heating plate heated to 245 ℃, a stainless steel cylinder was placed, to which oil was dropped from a pump at 2.5 g/min and water was dropped at 8 g/min. The test time was 10 minutes. The rotation speed of the filter was 1500 rpm.

Table 2 shows the results of this test. According to this test, 50% of the oil was trapped in the filter and 23% of the oil was attached to the downstream components in the range hood of the existing model, i.e., the range hood using the slotted filter. The remaining 27% of the oil was discharged to the outside together with air. On the other hand, in the range hood of the present example, that is, the range hood including the filter having the pore diameter of 2.0mm, 83% of the oil was trapped on the filter, and 7% of the oil was adhered to the downstream member. In addition, in the smoke exhaust ventilator having a filter with a pore diameter of 1.5mm, 83% of oil was captured on the filter, and 2% of oil was adhered to the downstream member. In addition, in the range hood having the filter with the pore diameter of 1.0mm, 87% of the oil was captured on the filter, and surprisingly, no oil was adhered to the downstream member.

According to the test, the trapping rate on the filter is significantly improved to 83% or more in the hood of this embodiment, compared to the trapping rate of the existing type hood. As a result, the adhesion of oil components to downstream members, which takes time and effort at the time of cleaning and washing, can be significantly suppressed. If it is considered that the trapping rate of the existing known hood is optimal, that is, 70%, the hood of the present invention used in this test has a trapping rate of 83% or more regardless of the change in the aperture, it can be said that the hood of the present invention has a high trapping efficiency. Therefore, the range hood of the present invention has almost no oil adhered to the downstream portion of the filter in the air flow path, and thus the burden of cleaning and washing the downstream portion of the filter can be greatly reduced.

[ Table 2]

Second embodiment

The description overlapping with the first embodiment is omitted, and only the differences will be described. In this embodiment, the control unit 90A is described as the control unit, since the control unit merely controls the fan 60 and the motor 20 differently from the first embodiment.

Control unit 90A controls motor 20 not to rotate at the level at which the rotation speed of fan 60 is minimum. That is, when the rotation speed of fan 60 is changed as in the above-described modified examples 8 and 9, controller 90A controls motor 20 not to rotate when the rotation speed of fan 60 is small. As a main noise source generated from the range hood, there are a fan that generates a flow of discharged air, wind noise, and the like. That is, since the noise is small as a whole when the fan 60 is operated at a low rotation speed such as a weak operation, the noise accompanying the rotation of the filter 10 and the motor 20 is conspicuous. Therefore, the filter may not be rotated even in the weak operation. Accordingly, when the sound accompanying the rotation of the filter is conspicuous, the filter is not rotated, and a quiet range hood can be provided.

In contrast, when fan 60 is operated at a medium or high rotational speed, since the rotational sound of filter 10 is engulfed by the noise generated by fan 60, controller 90A rotates filter 10. Further, when the fan 60 is operated weakly, the amount of soot generally generated by cooking is small, and the total amount of oil adhering to the filter 10 is small, so that it is not necessary to prevent clogging of the filter 10 by turning.

Further, when the rotation of fan 60 is completed only after the rotation of fan 60 has been completed at the level at which the number of rotations per unit time is minimum, controller 90A may control motor 20 (filter 10) to rotate when the rotation of fan 60 is completed. Accordingly, by rotating the filter 10 immediately after the operation of the range hood is completed, for example, when the user leaves the vicinity of the cooking range, the oil adhering to the filter can be ejected, the oil can be quickly ejected from the filter 10, and clogging of the filter can be prevented, and the amount of oil adhering can be reduced, and a range hood in which the user who leaves the range hood does not notice noise can be provided.

The level at which the number of revolutions per unit time of fan 60 is minimum may be the level at which the minimum number of revolutions of fan 60 used for cooking is assumed. That is, in the range hood equipped with the normal ventilation function of the entire indoor unit, the rotation speed during the normal ventilation operation is generally the smallest, and the rotation speed of the fan 60 is increased in the order of, for example, the weak operation, the medium operation, and the strong operation. However, normal ventilation is not assumed to be used in cooking. Therefore, in this case, as the level at which the number of revolutions per unit time of the fan 60 is minimum, the weak operation may be adopted.

In addition, the present invention is not limited to the exemplary embodiments, and may be implemented according to a configuration without departing from the scope of contents described in the items of the attached claims.

Claims (9)

1. A range hood is characterized by comprising:

a fan generating an air flow;

a filter located on an upstream side of the fan in a flow path of the air flow, the filter having a hole through which the air flow passes;

a motor for rotating the filter;

an oil trapping member surrounding the filter; and

a control part for controlling the rotation of the fan and the motor,

wherein the control portion is capable of rotating the fan and the motor simultaneously.

2. The range hood according to claim 1, wherein the control unit performs control such that a timing at which rotation of the fan starts is the same as a timing at which rotation of the motor starts, and/or a timing at which rotation of the fan ends is the same as a timing at which rotation of the motor ends.

3. The range hood according to claim 2, wherein the control unit performs control such that a timing at which rotation of the fan starts is the same as a timing at which rotation of the motor starts, and performs control such that the rotation of the motor is ended after a predetermined time has elapsed after the rotation of the fan is ended.

4. The range hood according to claim 1, wherein the control unit performs control such that a timing at which rotation of the fan is started and a timing at which rotation of the motor is started are different from each other, and a timing at which rotation of the fan is ended and a timing at which rotation of the motor is ended are different from each other.

5. The hood according to any one of claims 1 to 4, wherein the control unit changes a rotation speed of the fan and changes a rotation speed of the motor according to the rotation speed of the fan.

6. The range hood of claim 5, wherein the control section varies the rotation speeds of the fan and the motor in stages.

7. A range hood is characterized by comprising:

a fan generating an air flow;

a filter located on an upstream side of the fan in a flow path of the air flow, the filter having a hole through which the air flow passes;

a motor for rotating the filter;

an oil trapping member surrounding the filter; and

a control unit capable of changing the rotation speeds of the fan and the motor in stages,

wherein the control unit does not rotate the motor at a level at which the rotation speed of the fan is minimum.

8. The hood according to claim 7, wherein the control unit rotates the motor when the rotation of the fan is completed, when the rotation of the fan is completed only at a level at which the rotation speed of the fan is minimum.

9. The range hood according to any one of claims 1 to 8, comprising a filter rotation control switch for controlling rotation of the motor.