JP2015014455A - Range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a range hood with a small pressure loss and high oil collection efficiency.SOLUTION: A range hood 1 includes a fan 60 that generates an air flow, a filter 10 that exists on an air flow channel and on an upstream side with respect to the fan 60 and that has a hole for allowing the passage of the air flow, an electric motor 20 that rotates the filter 10, and an oil content collection member 30 that surrounds the periphery of the filter. When the fan 60 generates the air flow, the electric motor 20 rotates the filter 10 to separate an oil content included in air, and the separated oil content is collected by the oil content collection member 30.

Description

  The present invention relates to a range hood that collects oil from oily smoke generated by cooking, and more particularly to a range hood that exhibits significant oil collection efficiency.

A range hood installed in a kitchen or the like inhales steam or smoke generated by cooking under the range hood together with the air flow generated by the fan, and the oil smoke or the like together with the inhaled air to the outdoors. It is what is discharged. However, it is not environmentally preferable to discharge the oil contained in the oil smoke to the outside as it is, and the oil is attached to equipment such as fans and ducts that are usually present downstream of the range hood in the air flow path for cleaning, etc. A large amount of labor / cost is required for maintenance of the equipment, and the deterioration of the equipment is promoted.
Therefore, conventionally, since the range hood captures and collects the oil contained in the oil smoke in a filter or the like, many devices have been made to increase the oil collection efficiency.

  As a device for increasing the collection efficiency of the filter, for example, there is a technique disclosed in Patent Document 1. In this document, a plurality of rows are formed by vertically forming slits in a vertical direction at a pitch of 2 to 5 mm on a thin metal plate of a predetermined shape, and the entire tongue piece defined by the slits in each row is refracted and tilted in one direction. A filter for a range hood is disclosed in which a filter unit is formed by providing a vent hole having a vertical width of 1 to 3 mm without leaving a plane portion between the slits, and the filter unit or a plurality of units are combined.

  Such a filter has an oil collecting rate of about 50% and has an oil collecting effect, but is still not sufficient. If the slits of the filter are made finer in order to improve the collection efficiency, the oil is collected at a large number of slits at a small pitch, so the filter is likely to be clogged. In addition, when such a filter is clogged, it is easier to clean than a filter using a lath net or a metal net. However, since many slits are opened at a small pitch, it is very difficult to wash and wash all the slit portions. Takes a lot of labor and time and is inferior in cleanability. In particular, it is difficult to remove oil and dust that have penetrated into the inside, and the original function of the filter cannot be fully exhibited when oil or the like has penetrated inside. In addition, when a plurality of filters are combined to improve the collection efficiency, the ventilation resistance becomes high, the pressure loss of the range hood flow path becomes high, and the ventilation air volume is insufficient, resulting in poor ventilation. Or a fan capable of generating higher wind pressure is required.

  Moreover, as a device for improving the cleanability of the range hood, for example, there is a technique disclosed in Patent Document 2. This document removes dirt adhering to the filter without using a large amount of washing water by providing a filter that collects oily smoke during cooking and a brush that moves while contacting the surface of the filter (dirt wiping means). A range hood with a filter cleaning function is disclosed.

  Such a range hood reduces the time and effort for the user to clean the filter, but requires a brush, an electric motor that drives the brush, a tank of washing water, a spray nozzle, etc., and the structure of the range hood itself becomes complicated on a large scale, Cost also increases. In the first place, this range hood does not present a technique for improving the oil collection efficiency of the filter.

  In addition to preventing clogging of the filter and reducing the time and effort of cleaning, there is a technique disclosed in Patent Document 3 as a device for increasing the oil recovery rate by the filter. In this document, a rotatable filter having a blade and having a substantially disk shape is provided on the front side of a rotary blade for exhaust to remove oil in the exhaust gas, and exhaust gas flowing through the filter is exhausted. A range hood is disclosed in which a passage portion for guiding oil in exhaust gas to an inner surface is provided from the filter to the exhaust rotary blade while being guided to the rotary blade for exhaust.

  Such a range hood also does not significantly improve the collection efficiency of the filter beyond the technology in Patent Document 1, and does not require a large-scale complicated structure as in Patent Document 2, but while the range hood is in operation This is the same in that the oil component adhering to the filter is to be removed while the filter is not in operation (when the range hood is stopped). In addition, although the user's effort to clean the filter is somewhat reduced, a large amount of oil is scattered in the passage provided from the filter to the exhaust rotary blade, that is, in the downstream portion of the filter. It can not be said that the trouble of washing the downstream portion of the filter, which takes much trouble when cleaning the hood, is reduced.

Japanese Utility Model Publication No. 02-043456 JP 2006-292248 A JP 2006-38240 A

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is a filter that greatly exceeds conventional oil collection efficiency and has a small pressure loss, and is not easily clogged. And providing a range hood that reduces the labor for cleaning / washing the downstream portion of the air flow path from the filter, and realizes them with a simple structure.

As a result of intensive studies to solve the above problems, the present inventor has found that high oil collection efficiency can be obtained in a state where pressure loss is small by moving the filter while operating the fan of the range hood. It came to complete.
In order to solve the above-mentioned problems, a fan that generates an air flow, a filter that exists on the upstream side of the fan on the air flow path and has a hole through which the air flow passes, and a filter that rotates An oil collecting member that surrounds the periphery of the filter, and the motor rotates the filter when the fan generates air flow, thereby separating the oil contained in the air and removing the separated oil A range hood that collects in an oil collecting member is provided.
According to this, the range hood which has high oil collection efficiency in a state with a small pressure loss can be provided. In other words, less oil adheres to the filter and causes clogging, thereby reducing the cleaning effort of the filter itself and preventing an increase in pressure loss as it is used. Since the oil hardly adheres to the downstream portion, it is possible to provide a range hood that greatly reduces the trouble of cleaning / washing the downstream portion from the filter.

In order to solve the above-mentioned problem, oil smoke generated by cooking is collected, and an inner panel of the hood having an opening at the center, and a fan that is located above the opening of the inner panel and generates an air flow A filter having a hole through which an air flow is allowed to pass, an electric motor for rotating the filter, and an oil collecting member surrounding the filter. And a range hood that collects oil contained in the air in the oil collecting member by rotating the filter by the electric motor when the fan generates the air flow.
According to this, oil adheres to the inner panel, the filter, and the oil collecting member, and almost no oil adheres to the downstream portion of the filter in the air flow path, greatly reducing the trouble of cleaning / washing the downstream portion from the filter. A range hood can be provided.

The filter may further include a rectifying plate facing the upstream side of the air flow.
According to this, the speed of the air flow in the gap between the rectifying plate and the inner surface panel is increased, so that steam, oily smoke, etc. generated by cooking performed reliably below are sucked together with the air flow generated by the fan. It is possible to prevent oil leakage from the hood.

Furthermore, the electric motor may rotate the filter at 230 rpm or more.
According to this, the range hood which oil collection efficiency improves further can be provided.

Furthermore, the average value in the filter of the time required for one end and the other end of the diameter in the circumferential direction of the hole to pass one point on a certain circumference is 3.2 × 10 ⁻⁴ seconds or less. This may be a feature.
According to this, the range hood which oil collection efficiency improves further can be provided.

Furthermore, the pore diameter average passage time tx represented by the formula (1) described later may be 3.2 × 10 ⁻⁴ seconds or less.
According to this, the range hood which oil collection efficiency improves further can be provided.

  As described above, according to the present invention, a filter that greatly exceeds the conventional oil collecting efficiency and has a small pressure loss, is provided with a filter that is not easily clogged, and is easy to clean / clean, particularly an air flow path. The range hood which reduces the effort which cleans / washes a downstream part from the filter in and can implement | achieve these with a simple structure can be provided.

Sectional drawing of the 1st Example of the range hood which concerns on this invention. The perspective view seen from the lower part of the 1st Example of the range hood which concerns on this invention (The state which removed the baffle plate is shown). The front view (A), side view (B), top view (C), bottom view (D), sectional drawing (E) which show the filter and its peripheral part in the 1st Example of the range hood which concerns on this invention. It is a perspective view which shows the filter and its peripheral part in 1st Example of the range hood which concerns on this invention, (A) is the perspective view seen from upper direction, (B) is the perspective view seen from the downward direction. The perspective view of the filter in the 1st Example of the range hood which concerns on this invention, and its peripheral part. The expanded sectional view which shows the filter and its peripheral part in the 1st Example of the range hood which concerns on this invention (The position of a cross section is the same position as FIG.3 (E)). Action | operation explanatory drawing in the 1st Example of the range hood which concerns on this invention. The action explanatory enlarged view in the 1st Example of the range hood which concerns on this invention. The front view (A), the top view (B), bottom view (C), and perspective view (D) which show the electric motor which rotates the filter and filter in the 1st Example of the range hood which concerns on this invention. The front view (A), the top view (B), bottom view (C), and perspective view (D) which show the oil content collection member in the 1st Example of the range hood which concerns on this invention. Explanatory drawing which shows the modification of the shape of the hole of the filter in the 1st Example of the range hood which concerns on this invention. The graph which shows the relationship between the hole diameter average passage time and the collection rate in the 1st Example of the range hood which concerns on this invention. The test block diagram used for the test for obtaining the relationship between the collection rate in a filter, and the oil adhesion to a downstream part in the 1st Example of the range hood which concerns on this invention, and a prior art. Sectional drawing of the modification of the 1st Example of the range hood which concerns on this invention. Sectional drawing of the 2nd Example of the cooker hood which concerns on this invention. Sectional drawing of the 3rd Example of the cooker hood which concerns on this invention. Sectional drawing of 4th Example of the cooker hood which concerns on this invention.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
<First Example>
FIG. 1 shows a range hood 1 in a first embodiment according to the present invention. The range hood 1 has a thin hood portion 80 having a concave inner panel 81 on the inner surface for collecting steam, oily smoke, etc. generated by cooking performed below. The hood portion 80 is coupled to the blower box 82 connected to the exhaust duct D in the vicinity of the hood opening 2 located at substantially the center thereof. The blower box 82 includes a fan casing 61 inside, and the fan casing 61 includes a fan 60 that is a sirocco fan and generates an air flow. The suction port 62 of the fan 60 is disposed so as to be positioned in the hood opening 2 of the hood unit 80. Accordingly, when the fan 60 is operated, the hood opening 2 becomes negative pressure, and the 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 hood opening 2 is located on the upstream side of the fan 60 on the flow path of the air flow generated by the fan 60.

  The hood opening 2 has a mounting plate 50 attached so as not to form a gap that can be an air flow path with the inner surface panel 81, a disc-shaped filter 10 having a hole through which air flows, and a filter The rotating shaft is connected to the center of the disk 10, the motor 20 rotates the filter 10, the motor mounting tool 40 for mounting the motor 20 to the mounting plate 50, and the mounting plate 50 is attached to the outer peripheral edge of the filter 10. The surrounding oil collecting member 30 exists. Therefore, the range hood 1 is on the flow path of the air flow generated by the fan 60, and exists on the upstream side of the flow from the fan 60, and has a hole through which the air flow passes from the bottom to the top in the drawing. The filter 10 is provided to be rotatable.

  The air below the inner panel 81 includes steam, oily smoke, etc. generated by cooking. When the fan 60 is operated, it exists in the hood opening 2, that is, on the flow path of the air flow generated by the fan 60. Thus, the air is sucked into the hole of the filter 10 located on the upstream side of the fan 60 and passes through the hole. The filter 10 is rotatably provided by the electric motor 20. When the range hood 1 is operated, the fan 60 generates an air flow and the electric motor 20 rotates the filter 10. The range hood 1 collects oil contained in the air in the oil collecting member 30 by rotating the filter 10. How to collect will be described later.

  Such a range hood 1 uses a conventional slot filter, HEPA filter, etc., and has a small pressure loss as compared to improving the oil collecting efficiency by making slits and eyes fine or overlapping to form a multilayer. It can have high oil collection efficiency in the state. In other words, using a conventional slot filter, HEPA filter, etc., if the slits are made finer or overlapped into multiple layers to improve oil collection efficiency, the filter vent forms a complex flow path. Therefore, the ventilation resistance tends to be high, but in the case of such a range hood 1, the oil collecting efficiency is increased by the rotation of the filter, and thus it is not necessary to form such a complicated flow path. Therefore, it is possible to obtain a high oil collection efficiency while maintaining a low ventilation resistance as compared with the conventional filter. In addition, the filter is less likely to clog due to oil adhering to the filter, thereby reducing the cleaning effort of the filter itself and preventing an increase in pressure loss as it is used. Since the oil hardly adheres to the downstream portion, it is possible to provide a range hood that greatly reduces the trouble of cleaning / washing the downstream portion from the filter.

  The type of the fan 60 is not particularly limited, and may be another fan such as an axial fan that generates an air flow. Preferably, it is a sirocco fan with a high static pressure used for the present Example. A rectifying plate 70 that is detachable from the hood unit 80 and that has a gap between the hood unit 80 and increases the suction force is provided below the hood unit 80. Although the range hood 1 in the present embodiment includes the current plate 70, the presence of the current plate 70 is not particularly limited and may or may not be present. When there is no current plate or when the current plate is removed, as shown in FIG. 2, the inner surface panel 81 that is the inner surface of the hood portion 80 and the inner surface panel 81 are attached so that there is no gap between them. The attached mounting plate 50, the disk-shaped filter 10, and the oil collecting member 30 attached to the mounting plate 50 and provided to surround the outer peripheral edge of the filter 10 can be directly recognized by the user.

  Further, in this embodiment, the filter 10 is formed from a thin plate having a disk shape, but the present invention is not limited to this, and for example, the filter may be cylindrical. In this case, the cylindrical filter has a hole through which the cylinder rotates by connecting the rotating shaft of the electric motor to the central axis of the cylinder and allows the air flow to pass through the side surface of the cylinder. The air flow is configured to pass from the outside to the inside of the side surface of the cylinder. The oil collecting member is provided so as to surround the side surface of the cylinder. The tube may be placed horizontally or vertically. When the cylinder is placed horizontally, the oil collecting member includes an opening that opens downward to suck air and an opening that flows to let the air flow to the fan side. When the cylinder is installed vertically, the filter does not open the bottom of the cylinder in order to suck air flow from the side of the cylinder, and the oil collecting member is provided so as to surround the entire filter side. Since it has a simple structure and can provide a thin range hood, a filter having a disk shape as in this embodiment and formed from a thin plate is preferable.

  In this embodiment, the filter 10 is formed from a single thin plate, but may be formed from a plurality of thin plates, or a plurality of filters may be arranged on the flow path of the air flow. . According to such a configuration, even when the rotational speed of the filter is not sufficient, the oil collection rate becomes higher.

  Further, in this embodiment, the portions other than the holes on the surfaces on both sides of the filter 10 are smooth surfaces that are flat and smooth with no protrusions or irregularities, but are not limited to this, and are not limited to this. There may be protrusions such as cut and raised together with slits (holes). If the filter has a smooth surface as in this embodiment, the ventilation resistance of the air flow in the filter is further reduced, and further, the rotational resistance of the filter is also reduced, so the electric motor for rotating the filter has a small torque. Things are enough. Moreover, since there is no protrusion such as a cut and raised on the filter, it is possible to provide a range hood with low noise for cutting air. Further, these make it easy to rotate the filter at high speed. In addition, most of the oil is collected on the surface of the filter, and almost no oil is collected on the side of the filter hole, so the filter hole is less likely to be clogged with oil, and further cut and raised. Since there are no protrusions, the filter itself can be easily cleaned / washed.

  In this embodiment, the movement of the filter is a rotational movement around the center of the disk-shaped filter, but is not limited to this, and may be an eccentric rotational movement or a linear reciprocating movement. It may be. In terms of the simple structure and the ability to efficiently collect oil, a rotational movement with the center of the disk-shaped filter as the center of rotation as in this embodiment is preferred.

  3-6 shows the filter 10 of the range hood 1 and its peripheral part (hereinafter referred to as a filter unit). The filter unit 3 has a mounting plate 50 attached to the hood opening 2, a disk-shaped filter 10 having a hole through which air flows, and a rotary shaft connected to the center of the disk of the filter 10 to rotate the filter 10. An electric motor 20 to be attached, an electric motor attachment 40 for attaching the electric motor 20 to the attachment plate 50, and an oil collecting member 30 attached to the attachment plate 50 and provided to surround the filter 10.

  The mounting plate 50 is a substantially square flat plate provided with a circular mounting plate opening 51 at the center. In the present embodiment, the periphery of the flat plate is curved upward with a curvature, but is not limited thereto, and may be configured to be attached to the hood opening 2 of the inner surface panel 81. The attachment plate 50 and the hood opening 2 are attached without a gap or the like, and the air flow does not pass through this attachment portion. Therefore, the mounting plate opening 51 is the only part that allows the air flow generated by the fan 60 to pass therethrough, and the mounting plate opening 51 is a flow path for the air flow generated by the fan 60.

  The motor fixture 40 is provided on the downstream side of the air flow of the mounting plate 50 so as to straddle the mounting plate opening 51. The electric motor attachment 40 has a hole 41 through which the rotating shaft 21 of the electric motor 20 is passed substantially in the center, and has a marginal portion so that it can be easily attached to the attachment plate 50. The electric motor attachment 40 is attached to the attachment plate 50 so that the hole 41 is the center of the attachment plate opening 51 in a plan view.

  The electric motor 20 is fixed to the electric motor fixture 40 by passing the rotation shaft through the hole 41 of the electric motor fixture 40 from the upper side to the lower side in the drawing (from the downstream side to the upstream side of the air flow). The The rotating shaft 21 of the electric motor 20 is the center of a circular mounting plate opening 51 in plan view.

  The filter 10 is detachably attached to the tip of the rotating shaft 21 of the electric motor 20 so that the surface of the filter 10 is perpendicular to the rotating shaft 21. The outer shape of the filter 10 is circular, and the filter 10 is attached to the rotating shaft 21 of the electric motor 20 located at the center of the circular attachment plate opening 51 at the center of the filter 10. The outer shape of the part 51 is a concentric circle. In this embodiment, the diameter of the filter 10 is larger than the diameter of the mounting plate opening 51 because the mounting plate opening 51 has the extending portion 52. The extending portion 52 extends to the upstream end of the oil collecting member 30 from the inner wall of the oil collecting member 30, that is, to the rotating shaft side of the electric motor 20. This extending portion 52 is preferable because it increases the rate at which oil that has passed through the holes can be collected, and can provide a range hood with high oil collection efficiency.

  The position of the filter 10 in a front view is below the lower surface of the mounting plate 50, that is, upstream of the air flow. Therefore, the oil collecting member 30 is attached to the attachment plate 50 so as to surround the outer peripheral edge of the filter 10. The distance between the outer peripheral edge of the filter 10 and the inner wall of the oil collecting member 30 needs to be larger than 0 so that they do not contact each other, but is preferably as small as possible so that the oil does not leak. In this embodiment, it is about 2.5 mm. The oil collecting member 30 is provided with an oil reservoir 31 at the lower end. The oil reservoir 31 is where the oil component bounced off against the upstream surface of the filter 10 hits the inner wall of the oil component collecting member 30 and the oil component is stored.

  The height of the range hood 1 is made up of the height of the hood portion 80 and the height of the blower box 82. The height of the blower box 82 is almost defined by the height of the fan 60, and the height of the hood portion 80 is From the sum of the height from the upper end of the electric motor 20 to the lower end of the oil collecting member 30, that is, the height of the filter unit 3, and the depth (height) of the concave portion of the inner surface panel 81 for capturing air containing oil and the like. It is prescribed. In order to capture air containing oil or the like, a certain degree of depth (height) of the recess is required. Therefore, reducing the height of the filter unit 3 reduces the overall height of the range hood 1. In order to provide a thin range hood, it becomes important. In this embodiment, the filter unit 3 is thin and preferable because the filter 10 is formed from a thin plate having a disk shape.

  FIG. 7 and FIG. 8 explain the action of collecting the oil component accompanying the air flow in the range hood 1. FIG. 7 shows the action of the air flow in the entire range hood 1. The heated air A rises toward the range hood 1 together with steam, oily smoke, etc. generated by cooking performed below the range hood 1. When the range hood 1 starts operation and the fan 60 starts to rotate, the fan 60 generates an air flow from the bottom to the top in the drawing. Then, the air rising around the rectifying plate 70 is sucked from between the rectifying plate 70 and the inner surface panel 81, then passes through the hole 11 of the filter 10 and is sucked into the suction port 62 of the fan 60 in the fan casing 61. The Then, the air is discharged from the blower box 82 to the exhaust duct D.

  The rotational speed per unit time of the filter 10 may be at least 230 rpm (Rotation Per Minute) or more, although it depends on the opening state of the filter hole. Details such as the relationship with the opening state of the holes will be described later. When the filter 10 rotates at a relatively high speed, the surface of the filter 10 (the portion without the hole 11) drags the air in contact with the surface by frictional force, and the movement is transmitted to the nearby air due to the viscosity of the air. The movement of air occurs near the surface of the filter 10, and the filter 10 is rotating, so that the movement of the air is a vortex around the rotation axis.

  This spiral air movement occurs on both surfaces of the filter 10, that is, on both the lower surface and the upper surface of the filter 10, in other words, on both the upstream surface and the downstream surface of the air flow A of the filter 10. In the present embodiment, since the air flow A generated by the fan 60 flows from the bottom to the top through the hole 11 of the filter 10 in the drawing, the movement of the spiral air on the downstream side of the filter 10. While being separated from the surface of the filter 10, a spiral flow toward the outer peripheral edge of the filter 10 is generated and sucked from the suction port 62 by the fan 60. On the other hand, on the upstream side of the filter 10, the movement of the vortex air is pressed against the surface of the filter 10, and a high-density air layer with a vortex flow toward the outer peripheral edge of the filter 10 is formed.

  FIG. 8 shows the effect of the air flow in the filter unit 3. The oil component OP1 generated by cooking or the like flows along with the air flow A and reaches the vicinity of the upstream surface of the filter 10. The oil component OP2 that has reached the vicinity of the upstream side is partly (oil component with a small particle diameter) due to a spiral flow toward the outer periphery of the dense air layer, and the other part (oil component with a large particle diameter) is By colliding with the upstream surface of the filter 10 (the portion without the hole 11), the filter 10 is blown off in the direction of the outer peripheral edge. As a result, the oil collecting member 30 provided so as to surround the outer peripheral edge of the disk-shaped filter 10 is collected as the oil component OP3 and is collected in the oil reservoir 31 as the oil OL.

  The oil that has become very fine particles passes through the holes of the filter 10 together with the air flow A, but some of the oil is downstream from the filter 10 of the extension 52 and the oil collecting member 30. It can be recovered by colliding with the inner wall. Part of the oil that could not be finally recovered adheres to the fan 60, the exhaust duct D, etc. located downstream from this, but most of the oil that became fine enough to pass through the holes of the filter 10 Then, it rides on the air flow A as it is, and is discharged to the outside through the exhaust duct D. Therefore, the range hood 1 of the present embodiment according to the present invention hardly cleans / washes the fan 60, the exhaust duct D, and the like in the downstream portion of the filter 10 while hardly attaching oil to the downstream portion of the air flow path from the filter 10. Time and effort can be greatly reduced.

  FIG. 9 shows the filter 10 and the electric motor 20 that rotates the filter 10 in this embodiment. The filter 10 and the rotating shaft 21 of the electric motor 20 are detachably connected so that the surface of the filter is perpendicular to the rotating shaft 21. The length of the rotating shaft 21 is determined based on the relationship with the height of the electric motor fixture 40, but is determined so that the filter 10 is located upstream of the lower surface of the mounting plate 50 in a front view. The type of the electric motor 20 is not particularly limited. Although the electric motor 20 has the capability that the rotation speed per unit time is at least about 200 rpm, it is not limited to this.

  The filter 10 has a disc shape and is made of a thin plate having a circular outer shape by punching metal. The material is stainless steel, the plate thickness is 0.5 mm, and the diameter is 285 mm, but it is not limited to this. The shape of the hole 11 provided in the filter 10 will be described later. In addition, even if it changes the plate | board thickness of a filter between 0.5 mm and 1.0 mm, since the collection rate in a filter does not change, when the air which produced the flow with a fan passes the hole of a filter, It has been found that most of the oil is collected on the surface of the filter rather than collecting the oil on the side of the hole. Therefore, the range hood according to the present invention can prevent the filter holes from being clogged with oil, reduce the cleaning effort of the filter itself, and prevent pressure loss from increasing as it is used.

  FIG. 10 shows the oil collecting member 30 in the present embodiment. The oil collecting member 30 has a cylindrical portion surrounding the outer peripheral edge of the disk-shaped filter 10. The cylindrical part has an outer diameter of 294 mm and an inner diameter of 290 mm, which is slightly larger than the diameter of the filter 10. The gap between the two is preferably as small as possible so that oil does not leak. The height of the oil collecting member 30 is not particularly limited, but the shortest distance between the downstream end (upper end) of the oil collecting member 30 and the disk surface on the downstream side of the filter 10 is the height of the oil collecting member 30. It is preferable to have a height equal to or greater than the shortest distance between the upstream end (lower end) and the upstream disk surface of the filter 10. Thereby, the ratio which can also collect the oil component which passed the hole 11 increases by capturing the oil component which scatters toward the outer periphery direction in the downstream of the filter 10, and can make oil collection efficiency higher. .

  The oil collecting member 30 includes a flange at the downstream end (upper end), and is easy to attach to the mounting plate 50. Moreover, it is preferable that the oil content collection member 30 is provided detachably for cleaning. The oil collecting member 30 includes a U-shaped oil reservoir 31 at the upstream end (lower end), thereby collecting the oil.

  FIG. 11A shows the shape of the hole 11 of the filter 10 in this embodiment. FIG. 11 (A2) is an enlarged view within the dotted line of the circle in FIG. 11 (A1) (hereinafter the same in this figure). The shape of the hole 11 of the filter 10 is circular, and the diameter of the hole 11 is about 0.75 to 5 mm. The holes 11 in the disk-shaped filter 10 are arranged concentrically around the center of rotation of the disk as shown in (A1). However, the shape, size, and arrangement of the holes are not limited to this. For example, the hole arrangement may be any arrangement, such as holes being drilled at the vertices of regular triangles, holes being drilled at the vertices of regular squares, or irregularly randomly. Further, the shape of the hole may be any shape such as a triangle, a square, or a regular polygon in addition to the following modifications.

  FIGS. 11B to 11E show modified examples of the shape of the hole. As shown in FIG. 11B, the shape of the hole 11a is an ellipse having a major axis in the radial direction of the disk-shaped filter. In this modification, the ratio of the minor axis to the major axis is about 1: 2.2, but is not limited to this. The holes 11a are arranged concentrically around the center of rotation of the disk as in (A), but are not limited thereto.

  As shown in FIG. 11C, the shape of the hole 11b is an ellipse having a minor axis in the radial direction of the disk-shaped filter. In this modification, the ratio of the minor axis to the major axis is about 1: 2.4, but is not limited to this. The holes 11b are arranged concentrically around the center of rotation of the disk, as in (B), but are not limited thereto.

  As shown in FIG. 11D, the shape of the hole 11c is a rectangle. In this modification, the ratio of the short side to the long side is about 1: 3.5, but is not limited to this. The hole 11c has an angle in which the direction of the long side is neither the radial direction nor the circumferential direction, but is not limited thereto. For example, the direction of the long side may form the radial direction.

As shown in FIG. 11E, the shape of the hole 11d is an irregular polygon. It is shaped like a combination of a rectangle and a triangle, and the shape is such that the vertex of the triangle faces in the rotation direction, but it is not limited to this, and the vertex of the triangle may face in the direction opposite to the rotation direction .
One filter may be provided on one filter, and a combination of two or more shapes may be used. Moreover, when shape | molding a hole (slit) by cutting and raising, there may be a cutting and raising part like a general slot filter with the hole (slit).

  The region where the hole is provided on the filter may be the entire filter surface or a part thereof. When it is a part, the area where the hole is provided may be an area close to the outer peripheral edge of the disk-shaped filter (that is, the area close to the rotation center is not provided with a hole). It may be a region near the rotation center of the filter (that is, a region near the outer peripheral edge is not provided with a hole). However, if the shape and size of the same hole is the same, the rotation speed is faster near the outer peripheral edge, so it is preferable to provide the hole in a region near the outer peripheral edge of the disk-shaped filter.

  As shown in FIG. 11, the diameter DA (m) in the circumferential direction of the hole is the maximum value of the length of the arc sandwiched between both ends of the hole in a concentric circle that crosses the hole around the rotation center of the filter. Say. The hole diameter passing time is expressed as DA / Vx (seconds) when the peripheral speed at the distance Rx (m) from the rotation center is Vx (m / second). The pore diameter average passage time tx (seconds) is an average of the pore diameter passage times over the entire filter, and is represented by the equation (1). Here, the radius outside the region where the holes in the filter are present is Rmax (m), the radius inside the region where the holes are in the filter is Rmin (m), and the number of rotations per second of the filter is N (/ second). Let the angular velocity of the filter be ω (radians / second). In addition, the area | region with a hole on a filter exists concentrically centering on a rotating shaft, and a hole shall be distributed uniformly in the area | region. The hole diameter passage time is DA / 2πNRx, and the hole diameter average passage time tx is as follows.

  In other words, the average hole diameter passage time is the average value of the filter for the time required for one end and the other end of the diameter of the filter hole in the circumferential direction to pass through one point on a certain circumference. For convenience, in the region where the hole exists, the length of the arc in the circumferential direction across the hole existing in the radial position where the inner and outer areas are the same, that is, the length of the diameter in the circumferential direction of the hole It can be said that it is the time required to move. This will be described with reference to FIG. The circular hole 11 moves in the circumferential direction at a speed of V (m / sec) while drawing an arc from the left to the right in the drawing centering on the rotation center (not shown) of the filter. Points α and β are points on the outer circumference of the hole 11 and on the same circumference of the center of rotation, and point γ is a midpoint of the arc αβ. Accordingly, the points α and β are one end and the other end of the diameter of the hole 11 in the circumferential direction.

Since the diameter of the hole 11 in the circumferential direction is the maximum value of the length of the arc sandwiched between both ends of the hole 11 in the concentric circles that cross the hole 11, the length of the arc αβ is the maximum value. This is a case where the straight line connecting the points α and β is the diameter of the hole 11. In this case, the length of the arc αγβ is DA. The time required for one end (point α) and the other end (point β) of the diameter of the hole 11 in the circumferential direction to pass one point (point γ) on a certain circumference is the point β is the point γ Is the time from when the point α passes the point γ. Further, when the radius outside the region where the hole exists in the filter is Rmax (not shown) and the radius inside the region where the hole exists in the filter is Rmin (not shown), the region where the hole exists , Outside Rmin and inside Rmax, and the width is (Rmax−Rmin). The radial position Rctr (not shown) having the same area on the inner side and the outer side satisfies the following expression.

πRmax ² −πRctr ² = πRctr ² −πRmin ²

The peripheral speed Vav of the hole 11 is obtained by integrating the total value of the peripheral speeds of the mass points arranged on the same circumference around the rotation center of the filter from Rmin to Rmax, and the integrated value is calculated for the hole in the filter. It can also be obtained by dividing by the area of the existing region (region from Rmin to Rmax). Specifically, the peripheral speed Vav of the hole 11 satisfies the following formula.

Vav = 4πN (Rmax ² + RmaxRmin + Rmin ² ) / 3 (Rmax + Rmin)

Based on the circumferential velocity obtained as described above and the length of the arc at Rctr, the time required for one end and the other end of the diameter in the circumferential direction of the hole to pass through one point on a certain circumference. An average value in the filter can be obtained.
Even in a filter in which all the same holes are uniformly arranged in one filter as in this embodiment, and in a filter in which holes having different shapes and sizes are arranged in one filter, Find the arc length and the peripheral speed at the hole position (distance from the center of rotation), and each hole moves the arc length of each hole (diameter in the circumferential direction) The average time in the filter of the time required for one end and the other end of the diameter in the circumferential direction of the hole to pass one point on a certain circumference is obtained by calculating the time required for The value can be determined.

FIG. 12 is a graph showing the relationship between the average pore diameter passage time tx and the collection rate in the range hood according to the present invention. Each plot on the graph shows the average pore diameter passage time and collection rate as measured by rotating filters of various pore sizes at various revolutions per unit time. A regression curve (second-order polynomial regression curve, R ² = 0.97) was drawn so that the R-square value was the maximum for the plot on the graph. According to this, the average collection time exceeding 70%, which is the best collection rate among the conventional filters, is determined based on the dotted regression curve considering an error of about 3% in the average pore diameter passage time. It is 3.2 × 10 ⁻⁴ seconds, and preferably the average pore diameter passage time is about 2.7 × 10 ⁻⁴ seconds by a solid regression curve. Therefore, if the average pore diameter passage time is 3.2 × 10 ⁻⁴ seconds or less, a range hood with high oil collection efficiency can be provided.

As is apparent from the equation (1), the average pore diameter passage time tx decreases as the rotational speed N of the filter increases or when the hole diameter DA decreases. Therefore, the range hood according to the present invention is capable of adjusting the average pore diameter passage time using the filter rotation speed and the filter hole diameter as parameters. Since the regression curve descends to the lower right, in order to improve the collection rate, it is preferable to decrease the average pore diameter passage time. Accordingly, in order to obtain a collection rate of about 80%, it may be about 1.8 × 10 ⁻⁴ seconds, and preferably about 1.5 × 10 ⁻⁴ seconds. Moreover, in order to make a collection rate into about 90%, it is about 0.98 * 10 <^-4> second, Preferably it is good also as about 8.0 * 10 <^-5> second.

  Table 1 shows the relationship between the hole diameter (mm) and the rotational speed (rpm) of the filter and the collection rate in this example. The collection rate was measured with four types of hole diameters of 0.75 mm, 1 mm, 1.5 mm, and 2 mm. When the rotational speed of the filter is 0 rpm, it can be seen that the collection efficiency is less than 70% which is the best collection rate of the conventional filters at any hole diameter, and the filter not rotating is not high.

  On the other hand, when the filter is rotated at 1000 rpm, the trapping rate is 77% even in the filter having the lowest trapping rate of 2 mm, which exceeds the trapping rate of the conventional best filter. Moreover, as the hole diameter decreases to 1.5 mm, 1 mm, and 0.75 mm, the collection rate further increases to 80%, 86%, and 88%. Furthermore, when the rotation speed of the filter is 1500 rpm, the collection rate becomes higher as 84%, 86%, 91%, and 93% as the hole diameter decreases to 2mm, 1.5mm, 1mm, and 0.75mm. Become. Furthermore, when the rotational speed of the filter is 2000 rpm, the collection rate becomes 88%, 90%, and 90% as the hole diameter decreases to 2 mm, 1.5 mm, and 1 mm. Therefore, the range hood which concerns on this invention collects the oil component contained in air, when a fan rotates a filter, generating the flow of air. Furthermore, it can be seen that when the number of rotations per unit time of the filter is increased or the pore diameter is decreased, high oil collection efficiency can be obtained.

As described above, the average pore diameter passage time exceeding the collection rate of 70% is 3.2 × 10 ⁻⁴ seconds, and this average pore diameter passage time is determined by the combination of the pore diameter and the rotational speed of the filter. If it does so, in the case of the combination of the following hole diameters and rotation speeds, a hole diameter average will be 3.2x10 <^-4> second and the collection rate of 70% is realizable. That is,
-The hole diameter, that is, the diameter in the circumferential direction of the hole is 0.75 mm or less, and the rotational speed of the filter is 230 rpm or more, or
-The hole diameter is 1.00 mm or less and the rotational speed of the filter is 310 rpm or more, or
-The hole diameter is 1.50 mm or less and the rotational speed of the filter is 460 rpm or more, or
-The hole diameter is 2.00 mm or less and the rotational speed of the filter is 620 rpm or more, or
-A range hood with high oil collection efficiency can be provided when the hole diameter is 5.00 mm or less and the rotational speed of the filter is 1500 rpm or more.

More preferably, the average pore diameter passage time exceeding 70% is 2.7 × 10 ⁻⁴ seconds. Then, similarly,
-The hole diameter, that is, the diameter in the circumferential direction of the hole is 0.75 mm or less, and the rotational speed of the filter is 270 rpm or more, or
-The hole diameter is 1.00 mm or less and the rotational speed of the filter is 360 rpm or more, or
-The hole diameter is 1.50 mm or less and the rotational speed of the filter is 540 rpm or more, or
-The hole diameter is 2.00 mm or less and the rotational speed of the filter is 720 rpm or more, or
-A range hood with high oil collection efficiency can be provided when the hole diameter is 5.00 mm or less and the rotational speed of the filter is 1800 rpm or more.

  Further, when the oil component collides with the upstream surface of the filter (portion without the hole 11), most of the oil component is blown off in the direction of the outer peripheral edge of the filter, but a part of the oil component may adhere to the surface. When the rotational speed of the filter increases, the oil once adhered to the filter surface is blown away in the direction of the outer peripheral edge by centrifugal force. As a result, the range hood according to the present invention can reduce the cleaning effort of the filter itself by less oil remaining on the filter.

  FIG. 13 shows the test configuration used in the test for obtaining the relationship between the collection rate of the filter in the range hood using the present embodiment and a conventional type slot filter, and the adhesion of oil to downstream parts such as fans and ducts. FIG. Using the fact that the collection rate varies depending on the difference in the pore diameter of the filter of this example, and to check the oil adhesion state to the downstream parts due to the difference in the collection rate of the filter, the following test was conducted. .

  The test method is as follows. A range hood provided with a filter or the like according to the present invention is provided 800 mm above the hot plate capable of controlling the temperature. A stainless steel cylinder is placed on a hot plate heated to 245 ° C., and oil is dropped from the pump onto the stainless steel cylinder at a rate of 2.5 g / min and water at 8 g / min. The test time is 10 minutes. The rotation speed of the filter is 1500 rpm.

  The results of this test are shown in Table 2. According to this test, in a range hood using a slot filter which is a conventional type range hood, 50% of oil is collected in the filter, and 23% of oil is attached to downstream parts. The remaining 27% of oil is discharged to the outside together with air. On the other hand, in the range hood of the present embodiment, which includes a filter having a pore diameter of 2.0 mm, 83% of the oil is collected in the filter, and 7% of the oil is attached to the downstream part. Moreover, in a range hood provided with a filter having a hole diameter of 1.5 mm, 83% of oil is collected in the filter, and 2% of oil is attached to downstream parts. In addition, in a range hood provided with a filter having a pore diameter of 1.0 mm, 87% of oil is collected in the filter, and surprisingly, no oil adheres to downstream parts.

  According to this test, compared with the collection rate of the conventional type range hood, in the range hood according to the present example, the collection rate at the filter is clearly high at 83% or more. As a result, it is possible to remarkably suppress oil from adhering to downstream parts that are troublesome for cleaning / washing. Considering that the collection rate of the conventionally known range hood is 70% at the best, the range hood according to the present invention used in this test is 83% or more despite the change in the pore diameter. It has a collection rate, and it can be said that the range hood according to the present invention has a high collection efficiency. Therefore, in the range hood according to the present invention, the oil component hardly adheres to the downstream portion of the filter in the air flow path, and therefore the labor for cleaning / washing the downstream portion of the filter can be greatly reduced.

<Modification of the first embodiment>
FIG. 14 shows a range hood 1 ′ which is a modification of the first embodiment according to the present invention. The description overlapping with the first embodiment is omitted, and only different points will be described. The range hood 1 ′ has a thin hood portion 80 ′ having a concave inner panel 81 ′ on the inner surface for collecting steam, oily smoke, etc. generated by cooking performed below. The hood portion 80 ′ is connected to an exhaust duct D and is connected to a blower box 82 having a fan 60 that generates an air flow therein, in the vicinity of the hood opening 2 ′ located at the substantially center thereof. The suction port 62 of the fan 60 is disposed so as to be located in the hood opening 2 ′ of the hood 80 ′. Accordingly, when the fan 60 is operated, the 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 hood opening 2 ′ is located on the upstream side of the fan 60 on the flow path of the air flow generated by the fan 60.

  The hood opening 2 ′ has a disk-shaped filter 10 having a hole through which air flows, a motor 20 having a rotating shaft connected to the center of the disk of the filter 10, and rotating the filter 10. There are an electric motor fixture 40 ′ for attaching to the panel 81 ′ and an oil collecting member 30 ′ attached to the inner panel 81 ′ and surrounding the outer peripheral edge of the filter 10. Therefore, the range hood 1 ′ is on the air flow path generated by the fan 60, and is present on the upstream side of the flow from the fan 60, and the hole through which the air flow passes from the bottom to the top in the drawing. The filter 10 having the above is rotatably provided.

  The air below the inner panel 81 ′ contains steam, oily smoke, etc. generated by cooking. When the fan 60 is operated, it exists in the hood opening 2 ′, that is, the flow of air flow generated by the fan 60. It is sucked into the hole of the filter 10 located on the road and upstream of the fan 60, and passes through the hole. The filter 10 is rotatably provided by the electric motor 20, and when the range hood 1 ′ is operated, the fan 60 generates an air flow and the electric motor 20 rotates the filter 10. The range hood 1 ′ collects oil contained in the air in the oil collecting member 30 ′ by rotating the filter 10.

  The main difference between this embodiment and the modification of this embodiment is that this modification does not include the mounting plate 50 provided in this embodiment, and the oil collecting member 30 ′ is provided with the inner panel 81. 'Attached directly to. Such a configuration of the range hood 1 ′ has a reduced number of parts, and can increase the area of the surface of the filter (inner part of the hole) for collecting oil and the total area of the holes through which air flows. Therefore, it is possible to provide a range hood with high oil collection efficiency and low pressure loss.

<Second Example>
FIG. 15 shows a range hood 1A according to the second embodiment of the present invention. The description overlapping with the first embodiment is omitted, and only different points will be described. The range hood 1A includes a thin hood portion 80A having a concave inner panel 81A on the inner surface for collecting steam, oily smoke, etc. generated by cooking performed below. The hood portion 80A is connected to the blower box 82A connected to the exhaust duct DA in the vicinity of the hood opening 2A located at substantially the center thereof. The blower box 82A has a fan casing 61A inside, and the fan casing 61A has a fan 60A that is a sirocco fan and generates an air flow AA.

  The suction port 62A of the fan 60A opens in a substantially vertical plane, and is arranged away from the hood opening 2A of the hood portion 80A that opens in a substantially horizontal plane. Since the blower box 82A itself and the connecting portion between the blower box 82A and the hood portion 80A are airtight, when the fan 60A operates, the inside of the blower box 82A becomes negative pressure, and the air below the inner surface panel 81A is sucked through the hood opening 2A. And is discharged to the outside through the exhaust duct DA. That is, the hood opening 2A is located on the upstream side of the fan 60A on the flow path of the air flow AA generated by the fan 60A.

  In the hood opening 2A, a mounting plate 50A that is attached so as not to generate a gap that can be an air flow path between the inner surface panel 81A, a disk-shaped filter 10A that has holes through which the air flow AA passes, A rotary shaft is connected to the center of the disk of the filter 10A, the motor 20A rotates the filter 10A, a motor attachment 40A for attaching the motor 20A to the attachment plate 50A, and an outer peripheral edge of the filter 10A attached to the attachment plate 50A. There is an oil collecting member 30A surrounding the. Accordingly, the range hood 1A is on the flow path of the air flow AA generated by the fan 60A and is upstream of the flow of the fan 60A, and allows the air flow AA to pass from the bottom to the top in the drawing. A filter 10A having a hole is rotatably provided.

  The air below the inner surface panel 81A contains steam, oily smoke, etc. generated by cooking. When the fan 60A is operated, it exists in the hood opening 2A, that is, on the flow path of the air flow AA generated by the fan 60A. Then, the air is sucked into the hole of the filter 10A located on the upstream side of the fan 60A and passes through the hole. The filter 10A is rotatably provided by the electric motor 20A. When the range hood 1A is operated, the fan 60A generates an air flow AA and the electric motor 20A rotates the filter 10A. The range hood 1A collects the oil contained in the air in the oil collecting member 30A by rotating the filter 10A.

<Third embodiment>
FIG. 16 shows a range hood 1B according to the third embodiment of the present invention. The description overlapping with the first embodiment is omitted, and only different points will be described. The range hood 1B includes a hood portion 80B including an inner panel 81B having an obliquely inclined portion for collecting steam, oily smoke, and the like generated by cooking performed below. The hood portion 80B is coupled to the blower box 82B connected to the exhaust duct DB in the vicinity of the coupling portion with the inner surface panel 81B. The blower box 82B has a fan casing 61B inside, and the fan casing 61B has a fan 60B that is a sirocco fan and generates an air flow AB inside.

  The suction port 62B of the fan 60B is opened in a substantially vertical plane, and is disposed apart from the hood opening 2B opened in a plane inclined approximately 45 degrees from the horizontal. Since the blower box 82B itself and the connecting portion between the blower box 82B and the hood portion 80B are airtight, when the fan 60B operates, the inside of the blower box 82B becomes negative pressure, and the air inside the hood portion 80B passes through the hood opening 2B. Inhaled and discharged to the outside through the exhaust duct DB. That is, the hood opening 2B is located on the upstream side of the fan 60B on the flow path of the air flow AB generated by the fan 60B.

  In the hood opening 2B, a mounting plate 50B that is attached so as not to generate a gap that can be an air flow path between the inner surface panel 81B, a disk-shaped filter 10B that has holes through which the air flow AB passes, A rotary shaft is connected to the center of the disk of the filter 10B, the motor 20B rotates the filter 10B, the motor attachment 40B for attaching the motor 20B to the attachment plate 50B, and the outer peripheral edge of the filter 10B attached to the attachment plate 50B. There is an oil collecting member 30B surrounding the. Accordingly, the range hood 1B is on the flow path of the air flow AB generated by the fan 60B and is upstream of the flow of the fan 60B, and passes the air flow AB from the bottom to the top in the drawing. A filter 10B having holes is rotatably provided.

  The air below the inner panel 81B includes steam, oily smoke, etc. generated by cooking. When the fan 60B is operated, the air is present in the hood opening 2B, that is, on the flow path AB of the air flow AB generated by the fan 60B. Then, the air is sucked into the hole of the filter 10B located on the upstream side of the fan 60B and passes through the hole. The filter 10B is rotatably provided by the electric motor 20B. When the range hood 1B is operated, the fan 60B generates an air flow AB and the electric motor 20B rotates the filter 10B. The range hood 1B collects oil contained in the air in the oil collecting member 30B by rotating the filter 10B.

<Fourth embodiment>
FIG. 17 shows a range hood 1C according to the fourth embodiment of the present invention. The description overlapping with the first embodiment is omitted, and only different points will be described. The range hood 1 </ b> C includes a hood portion 80 </ b> C having a concave inner panel 81 </ b> C on the inner surface for collecting steam, oily smoke, and the like generated by cooking performed below. The hood portion 80C is connected to the exhaust box DC near the hood opening 2C located at the center of the hood portion 80C, and is connected to a blower box 82C having a fan 60C that generates an air flow therein. The suction port 62C of the fan 60C is disposed so as to be positioned in the hood opening 2C of the hood portion 80C. Therefore, when the fan 60C is operated, the air below the inner panel 81C is sucked through the hood opening 2C and discharged to the outside through the exhaust duct DC. That is, the hood opening 2C is located on the upstream side of the fan 60C on the flow path of the air flow generated by the fan 60C.

  The hood opening 2C has a mounting plate 50C attached so as not to generate a gap that can be an air flow path between the inner panel 81C, a cylindrical filter 10C having a hole through which air flows, and a filter The motor 10C is connected so that the axis of the cylinder of the cylinder 10C coincides with the rotation axis, rotates the filter 10C, the motor attachment 40C for attaching the motor 20C to the oil collecting member 30C, and the attachment plate 50C. There is an oil collecting member 30 surrounding the side surface of the filter 10C. Accordingly, the range hood 1C is provided on the air flow path generated by the fan 60C, upstream of the flow from the fan 60C, and has a hole through which the air flow passes from the outside to the inside of the cylinder. The filter 10 </ b> C provided on the side surface of the filter is rotatably provided.

  The air below the inner surface panel 81C contains steam, oily smoke, etc. generated by cooking. When the fan 60C is operated, it exists in the hood opening 2C, that is, on the flow path of the air flow generated by the fan 60C. Thus, the air is sucked into the hole of the filter 10C located on the upstream side of the fan 60C and passes through the hole. The filter 10C is rotatably provided by the electric motor 20C. When the range hood 1C is operated, the fan 60C generates an air flow and the electric motor 20C rotates the filter 10C. The range hood 1C collects the oil contained in the air in the oil collecting member 30C by rotating the filter 10C.

  The main difference between the present embodiment and the first embodiment is that the first embodiment includes a disk-shaped filter 10, whereas the present embodiment has a cylindrical filter 10C whose axial center is substantially vertical. It is equipped with. The cylindrical filter 10 </ b> C has a hole that allows the air to pass through the side surface of the cylinder by rotating the cylinder by connecting the rotation shaft of the electric motor 20 </ b> C to the axis of the cylinder. The air flow is configured to pass from the outside to the inside of the side surface of the cylinder. Since the filter 10C sucks the air flow from the side surface of the cylinder, the bottom surface of the cylinder is not open. The oil collecting member 30C is provided so as to surround the entire side surface of the filter 10C. When air containing oil hits the filter 10C, the oil hits the side surface (surface without holes) of the cylinder, and the impacted oil is bounced off to the oil collecting member 30C by the side of the cylinder and collected in the oil reservoir 31C.

  In addition, this invention is not limited to the illustrated Example, The implementation by the structure of the range which does not deviate from the content described in each item of a claim is possible.

DESCRIPTION OF SYMBOLS 1 Range hood 2 Range opening part 3 Filter unit 10 Filter 11 Hole 20 Electric motor 21 Motor rotating shaft 30 Oil collecting member 31 Oil sump 40 Electric motor attachment 41 Electric motor attachment hole 50 Mounting plate 51 Mounting plate opening 52 Extension part 60 Fan 61 Fan casing 62 Suction port 70 Current plate 80 Hood part 81 Inner panel 82 Blower box D Exhaust duct A Air flow OP Oil content OL Oil

Claims (11)

A fan that generates air flow,
A filter present on the upstream side of the fan on the air flow path and having a hole through which the air flow passes;
An electric motor for rotating the filter;
An oil collecting member surrounding the filter,
A range hood that separates the oil contained in the air by the electric motor rotating the filter while the fan is generating the air flow, and collects the separated oil in the oil collecting member.   The oil component contained in the air is separated by rotating the filter when the fan is generating a flow of air and generating a movement of air toward an outer peripheral edge of the filter. 1. The range hood according to 1.   By rotating the filter when the fan is generating an air flow and generating a vortex-like air movement toward the outer periphery that presses against the upstream surface of the filter, the oil content in the air is reduced. The range hood according to claim 2, which is separated. A fan that generates air flow,
A filter present on the upstream side of the fan on the air flow path and having a hole through which the air flow passes;
An electric motor for rotating the filter when the fan is generating the air flow;
An oil collecting member that surrounds the filter, and the electric motor rotates the filter to collect the oil contained in the air;
Range hood equipped with.   The range hood according to claim 4, wherein when the electric motor rotates the filter, the oil contained in the air is blown off to collect the oil. An internal panel of a hood that collects oily smoke generated by cooking and has an opening in the approximate center;
A fan located above the opening of the inner panel and generating an air flow;
A filter having a hole that is located at or upstream of the opening that serves as a flow path for the air flow and that allows the air flow to pass therethrough;
An electric motor for rotating the filter;
An oil collecting member surrounding the filter;
With
A range hood that collects oil contained in the air in the oil collecting member by causing the electric motor to rotate the filter when the fan generates the air flow.   The cooker hood according to claim 6, further comprising a rectifying plate facing the upstream side of the air flow with respect to the filter.   The range hood according to claim 6 or 7, wherein the electric motor rotates the filter at 230 rpm or more. A fan that generates air flow,
A filter present on the upstream side of the fan on the air flow path and having a hole through which the air flow passes;
An electric motor for rotating the filter;
An oil collecting member surrounding the filter,
A range hood that collects oil contained in the air in the oil collecting member by causing the fan to generate the air flow and causing the electric motor to rotate the filter at 230 rpm or more. The average value in the filter of the time required for one end and the other end of the diameter of the hole in the circumferential direction to pass one point on a certain circumference is 3.2 × 10 ⁻⁴ seconds or less. The range hood according to any one of claims 1 to 7, characterized in that The range hood according to any one of claims 1 to 7, wherein an average passage time (tx) represented by the formula (1) is 3.2 x 10 ^-4 seconds or less.
Where DA is the diameter of the filter hole in the circumferential direction, Rmax is the radius outside the area where the filter hole is present, Rmin is the radius inside the area where the filter hole is present, and N is the rotation per unit time of the filter Is a number.