JP6243154B2 - Filter, oil collector and range hood - Google Patents

Description

  The present invention relates to a filter, an oil collecting device, and a range hood, and more particularly, to a filter that collects oil by rotating a filter, an oil collecting device, and a range hood provided with the filter.

  A range hood that is installed above or around the cooker and collects smoke, oil particles, and odors generated by cooking and exhausts or circulates indoors in an oil trap to separate and recover the oil from the collected air. A collecting device is provided. In this oil collection device, increasing the oil collection rate prevents contamination of the blower and ducts on the downstream side of the air flow of the device, and contributes to prolonging the maintenance cycle and extending the service life. Therefore, the applicant has applied for a range hood equipped with a high collection type oil collecting device that realizes a high oil collection rate by collecting oil by rotating a disk-shaped filter (Patent Document) 1).

Japanese Patent Application No. 2011-290150

  The shape of the hole through which the air flow provided in the filter described in the above document passes is a shape such as a circle, a triangle, a square, or a regular polygon, and the aspect ratio is relatively close to 1. In the case of such a shape, when the filter is washed with a cleaning tool such as a brush, there is a problem that the hair of the brush enters the hole and is caught and difficult to wash.

  Moreover, if the pressure loss of the filter is large and the ventilation resistance is large, a fan that generates air flow requires a motor with a large output, and noise during use increases, so a small ventilation resistance is preferable. However, in order to reduce the ventilation resistance, it is necessary to increase the aperture ratio of the filter. However, if the aperture ratio is increased, the high collection performance is lowered, and the strength for rotating the filter cannot be maintained. was there.

  In addition, when the rotational speed of the filter is increased, the oil collection rate tends to be improved. When the rotational speed is increased, there is a problem that noise increases due to the so-called wind noise of the filter itself and the quietness is lowered. .

  Therefore, the present invention secures a high oil collection rate, improves the cleanability so that it can be easily washed when washing the filter, and reduces the sound generated by the rotation of the filter itself. An object of the present invention is to provide a filter, an oil collecting device, and a range hood that improve the quietness of the device itself, optimize the aperture ratio and ventilation resistance of the filter, and improve the quietness of the entire device using the filter. It is another object of the present invention to ensure strength for rotating the filter even when the aperture ratio of the filter is increased.

In order to solve the above-mentioned problem, a disk-shaped filter that captures oil in the air by rotating it with an electric motor on a flow path of the air flow, and includes a plurality of holes having a slit shape that allows the air flow to pass therethrough. , the long axis direction of the slit, viewed contains a radial component of the filter, the long side of the slit is curved convex to the outer peripheral side of the filter, the curve, the circumferential direction component closer to the outer periphery of the filter many comprises filter is provided.
According to this, when the major axis direction of the slit hole is the circumferential direction (tangential direction), the oil collecting rate is lowered, while ensuring a high oil collecting rate and washing with a cleaning tool such as a brush. Even when doing so, it is possible to provide a filter with less catching and improved cleanability. Furthermore, compared to the case where the long side of the slit is a straight line, the aperture ratio can be increased, and as a result, the airflow resistance can be kept low, so a motor with a large output is not required for the fan that generates air flow. Thus, the quietness of the entire apparatus is improved. In addition, even when the aperture ratio is increased, it is possible to ensure the strength for rotating the filter.

Furthermore, the direction from the center side of the filter to the outer peripheral side in the major axis direction of the slit may include a component in the rotation direction of the filter.
According to this, since the ventilation resistance can be kept low, a large output motor is not required for the fan that generates the air flow, and as a result, the quietness of the entire apparatus is improved.

Furthermore, the direction from the outer periphery side to the center side of the filter in the long axis direction of the slit may include a component in the rotation direction of the filter.
According to this, an oil collection rate becomes high and it can suppress oil adhesion on the downstream side of the air of the filter. Moreover, the noise value of the filter itself is lowered, and the quietness is improved.

In order to solve the above-described problems, an oil collecting device is provided that includes the above-described filter, an electric motor that rotates the filter, and an oil collecting member that is positioned around the filter.
According to this, while ensuring a high oil collection rate, when cleaning the filter, the cleaning performance is improved so that it can be easily cleaned, and the filter itself is reduced so as to reduce the sound generated by the rotation of the filter itself. Thus, the oil collecting device can be provided in which the quietness of the entire device using the filter is improved by optimizing the aperture ratio and ventilation resistance of the filter. Moreover, even if the aperture ratio is increased, it is possible to provide an oil collecting device having a filter with high strength.

Further, when the motor rotates the filter, the oil contained in the air collides with the surface portion of the filter, is scattered toward the oil collecting member located around the filter, and is collected by the oil collecting member. This may be a feature.
According to this, the oil collection device which has a high oil collection rate in the state where pressure loss is small can be provided. That is, by rotating the filter so that the oil contained in the air collides with the surface of the filter and is scattered toward the oil collecting member located in the vicinity, the oil is less likely to adhere to the filter and cause clogging. Become.

Further, the electric motor may be characterized in that the filter can be rotated in both directions.
According to this, based on the relationship between the major axis direction of the slit hole and the rotation direction of the filter, the rotation direction of the filter can be selected according to the situation.

Moreover, in order to solve the said subject, a range hood provided with said oil collection apparatus can be provided.
According to this, while ensuring a high oil collection rate, when cleaning the filter, the cleaning performance is improved so that it can be easily cleaned, and the filter itself is reduced so as to reduce the sound generated by the rotation of the filter itself. It is possible to provide a range hood that improves the quietness, optimizes the aperture ratio of the filter and the ventilation resistance, and improves the quietness. Moreover, even if the aperture ratio is increased, a range hood having a filter with high strength can be provided.

  As described above, according to the present invention, a high oil collecting rate is ensured, and the cleaning property is improved so that the filter can be easily cleaned when the filter is cleaned. The filter itself, the oil collection device and the range hood are improved by improving the quietness of the filter itself so as to reduce the noise and optimizing the aperture ratio and ventilation resistance of the filter and improving the quietness of the entire device using the filter. can do. Moreover, even if the aperture ratio of the filter is increased, an oil collecting device and a range hood having a filter with high strength can be provided.

(A) Front view, (B) Plan view, (C) Bottom view, (D) Right side view, (E) Perspective view seen from the lower right, (F) ) Perspective view seen from the upper right. The perspective view seen from the lower right of the range hood of the first embodiment according to the present invention when the current plate is removed. Sectional drawing (in the II cross section of FIG. 1 (A)) of the range hood of the 1st Example which concerns on this invention. (A) Front view, (B) Plan view, (C) Bottom view, (D) Right side view, (E) Perspective view seen from the lower right of the oil collecting apparatus of the first embodiment according to the present invention, (F) The perspective view seen from the upper right. 1 is an exploded perspective view of an oil collecting device according to a first embodiment of the present invention. (A) Plan view, (B) Cross section (in the AA cross section of (A)), (C) Front view, (D) Side view, (E) of the filter of the first embodiment according to the present invention. Bottom view. (A) bottom view of filter according to first embodiment, (B) bottom view of filter modification 1, (C) bottom view of filter modification 2, and (D) filter modification 3 according to the present invention. Bottom view. (A) An enlarged bottom view in the vicinity of the center of the filter of the first embodiment, (B) An enlarged bottom view in the vicinity of the center of Modification Example 1 of the filter, and (C) An area in the vicinity of the center of Modification Example 2 of the filter. An enlarged bottom view, (D) An enlarged bottom view near the center of Modification 3 of the filter. (A1) An enlarged bottom view in the vicinity of the outer periphery of the filter according to the first embodiment, (C1) An enlarged bottom view in the vicinity of the outer periphery of Modification 2 of the filter, (D1) Enlarged bottom view, (A2) Schematic diagram of slit-shaped hole of filter of first embodiment, (C2) Schematic diagram of slit-shaped hole of modified example 2 of filter, (D2) Slit shape of modified example 3 of filter FIG. The bottom view of the modification 4 of the filter of the 1st example concerning the present invention. Action | operation explanatory drawing in the range hood of the 2nd Example which concerns on this invention. The operation explanation enlarged view in the range hood of the 2nd example concerning the present invention. Explanatory drawing which shows the diameter of the hole of the filter which concerns on this invention. The graph which shows the relationship between the hole diameter average passage time and the collection rate in the 2nd 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 with a filter, and the oil adhesion to a downstream part in the 2nd Example of the range hood which concerns on this invention, and a prior art.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
<First Example>
With reference to FIG. 1 thru | or FIG. 3, the range hood 1 concerning a present Example is demonstrated. The range hood 1 has a thin hood portion 2 having a concave inner surface panel 5 on the inner surface for collecting steam, oily smoke and the like generated by cooking performed below or around. The hood portion 2 is connected to a blower box 3 connected to an exhaust duct (not shown) in the vicinity of the communication port 6 located on the upper rear side. The blower box 3 includes a fan 4 that is a sirocco fan and generates an air flow D1. Therefore, when the fan 4 is operated, the communication port 6 becomes negative pressure, and the air below the inner panel 5 is sucked through the communication port 6 and discharged to the outside through the exhaust duct. The communication port 6 communicates with the fan 4, and is located on the flow path of the air flow D <b> 1 generated by the fan 4 and on the upstream side of the air flow from the fan 4.

  The communication port 6 has a mounting plate 50 attached so as not to generate a gap that can be an air flow path between the inner surface panel 5, a disk-shaped filter 10 having a hole through which the air flow D <b> 1 passes, 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. There is an oil collecting device 100 including an oil collecting member 30 that surrounds. Accordingly, the range hood 1 is on the flow path of the air flow D1 generated by the fan 4 and is present on the upstream side of the flow from the fan 4, 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 5 contains steam, oily smoke, etc. generated by cooking. When the fan 4 is operated, it exists in the communication port 6, that is, on the flow path of the air flow D <b> 1 generated by the fan 4. Thus, the air is sucked into the hole of the filter 10 located on the upstream side of the fan 4 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 4 generates the air flow D1 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.

  The type of the fan 4 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. Further, below the hood portion 2, a rectifying plate 7 that is detachable from the hood portion 2 and has a gap between the hood portion 2 and increases the suction force is provided. Although the range hood 1 in the present embodiment includes the current plate 7, the presence of the current plate 7 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 upper inner surface of the hood portion 2 is attached so that there is no gap between the inner surface panel 5 and the inner surface panel 5. 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.

  With reference to FIG. 4 thru | or FIG. 6, the oil collection apparatus 100 in a present Example is demonstrated. The oil collecting apparatus 100 is connected to a mounting plate 50 attached to a communication port, a disk-shaped filter 10 having a hole 11 through which air flows, and a shaft 21 which is a rotating shaft at the center of the disk of the filter 10. , An electric motor 20 that rotates the filter 10, an electric motor attachment 40 that attaches the electric motor 20 to the attachment plate 50, and an oil collecting member 30 that is attached to the attachment plate 50 and that surrounds the filter 10. Is provided.

  The mounting plate 50 is formed from a substantially square flat plate having a circular opening in which the filter 10 can be disposed at the center. The attachment plate 50 and the communication port are attached without a gap or the like, and the air flow does not pass through this attachment portion. Therefore, the circular opening is the only part that allows the air flow generated by the fan to pass through, and this opening is the flow path for the air flow generated by the fan. The mounting plate 50 may be formed integrally with the inner surface panel 5. Further, the attachment plate 50 includes two rectifying plate attachments 51 for attaching the rectifying plate 7.

  The electric motor attachment 40 is provided on the downstream side of the air flow of the attachment plate 50 so as to straddle the opening. The electric motor attachment 40 has a hole (not shown) for allowing the shaft 21 of the electric motor 20 to pass through in a substantially central portion, and is attached to the attachment plate 50 so that the hole becomes the center of the opening in a plan view. .

  The electric motor 20 is fixed to the electric motor fixture 40 by passing the shaft 21 through the hole of the electric motor fixture 40 from the downstream side to the upstream side of the air flow D1 (see FIG. 3). The shaft 21 of the electric motor 20 is the center of the circular opening of the mounting plate 50.

  The oil collecting member 30 is disposed so as to surround the outer periphery and the lower periphery of the peripheral edge 12 of the filter 10. The oil collecting member 30 has a ventilation opening 35, captures oil contained in the air flowing therein at the surface of the filter 10, and collects oil or the like scattered on the outer periphery by centrifugal force. The oil collecting member 30 extends inward from the outer wall 32 at the lower end of the outer wall 32 to prevent the oil and fat from dripping from the range hood, and the outer wall 32 that receives the oil scattered around the peripheral edge 12. And an extending portion 33 that covers the lower side of the peripheral edge portion 12 of the filter 10 and a rising portion 34 that rises from the peripheral edge portion 12 of the extending portion 33 toward the filter 10 so as to surround the ventilation opening 35, An oil reservoir 31 is provided for retaining oil scattered from the filter 10.

  The filter 10 is detachably attached to the distal end portion of the shaft 21 of the electric motor 20 by the detachable tool 15 so that the surface of the filter 10 is perpendicular to the shaft 21. The outer shape of the filter 10 is circular, and the filter 10 is attached to the shaft 21 of the electric motor 20 located at the center of the circular opening of the mounting plate 50 at the center of the filter 10. The outer shape is a concentric circle, and the diameter of the filter 10 is slightly smaller than the diameter of the opening.

  The filter 10 is formed of a circular metal flat plate having a hole 11 and has a bent portion 13 that bends in a circumferential shape inside a peripheral edge 12 that is an outer periphery of the filter 10. The bent portion 13 is bent with the electric motor 20 side as a convex, and the peripheral edge portion 12 is positioned farther from the electric motor 20 than the surface portion of the filter 10 having the holes 11. By doing so, when the oil content captured by the surface portion of the filter 10 is guided to the peripheral edge portion 12, the position where the oil content is scattered can be adjusted. Of course, the filter may be a simple circular flat plate without being bent in this way. Further, the filter may have a curved portion that is curved with a curvature smaller than that of the bend.

  The filter 10 includes a ventilation region portion 16 having a hole 11 and a portion that does not have the hole 11 between the outer peripheral edge portion 12 of the ventilation region portion 16. Thereby, intensity | strength can be made high in the outer peripheral part of the filter 10. FIG. The hole 11 of the ventilation region 16 is formed of a slit that is closer to the radial direction as it is closer to the center of the filter and gradually approaches the circumferential direction as it goes to the outer periphery. The slit-shaped holes 11 are concentrically divided into six stages, and the holes belonging to the respective stages are composed of a plurality of slit-shaped holes 11 that are congruent. The length of the slit in each step is shorter at the center, and is gradually increased toward the outer periphery. In the ventilation region 16, a vortex portion having no slit is formed so as to penetrate each step and fit into a slit-shaped hole belonging to each step. Of course, as will be described later, the presence / absence and number of steps, the shape and length of the slits, and the like are not limited thereto. For example, as shown in FIG. 10, the filter according to the present invention may be a filter 10 ″ that does not have a step and has different holes 11 ″ at the same distance from the center.

  In a slot filter often used in a general range hood, the oil collection rate is improved by narrowing the slits. However, if the slits are made finer, the ventilation resistance tends to increase. Also in the filter of the present invention, generally, when the aperture ratio of the filter (the ratio of the total area of the holes to the total area of the filter surface) is reduced, the pressure loss increases and the ventilation resistance tends to increase. On the contrary, when the aperture ratio is increased, the ventilation resistance is lowered. Therefore, it is preferable that the aperture ratio is high from the viewpoint of the ventilation resistance. However, if the aperture ratio is increased, the oil collection rate is lowered, which is not preferable from the viewpoint of the oil collection rate, and the strength of the filter itself for rotating at high speed may not be ensured. The present invention contributes to ensuring a high oil collection rate, increasing the aperture ratio, and ensuring the strength of the filter itself.

  In the oil collecting device 100, as shown in FIG. 5, the user can easily attach and detach the oil collecting member 30 and the filter 10. Since the oil collecting member 30 is fitted and held in a recess formed corresponding to the outer shape (outer wall) of the oil collecting member 30 provided on the mounting plate 50, it can be easily attached and detached in the vertical direction. Further, the filter 10 is integrated with the attachment / detachment tool 15, and is held by engaging the attachment / detachment tool 15 with the shaft 21 of the electric motor 20. The user can easily operate the attachment / detachment tool 15 in the vertical direction. Detachable. According to this, the user can use the oil collecting device 100 for a while to easily collect the oil collected in the oil reservoir 31, and wash the oil collecting member 30 and the filter 10 that are soiled with oil or the like. it can.

  The filter holes will be described with reference to FIGS. The hole of the filter shown in FIG. 7A has a slit shape. As a result, when the hole has an aspect ratio close to 1, when washing with a cleaning tool such as a brush, the hair of the brush may enter and get caught in the hole. There are few, and cleaning property can be improved. The major axis direction of the slit-shaped hole 11 includes a component in the radial direction of the filter 10. That is, all the holes 11 in the filter 10 do not include a component in the radial direction and do not include only the circumferential direction (tangential direction). All the holes are formed so as to be directed from the central portion of the filter 10 toward the peripheral edge 12. When the major axis direction of the slit-shaped hole is the circumferential direction (tangential direction), the oil collecting rate is lowered, so that a high oil collecting rate can be secured. The major axis direction when the long side of the hole is a curve refers to the direction of the tangent at all points on the major axis curve.

  The slit-shaped hole 11 is formed of a curve that curves convexly toward the outer periphery of the filter 10 and contains more components in the circumferential direction as it approaches the peripheral edge 12. That is, the hole in the filter is configured to be closer to the radial direction (radial direction) toward the center and closer to the circumferential direction (tangential direction) toward the outer periphery. According to this, compared with the case where the long side of the slit is a straight line, the aperture ratio can be increased, and as a result, the ventilation resistance can be kept low, so that the fan that generates the air flow has a large output. An electric motor becomes unnecessary, and the quietness of the entire apparatus is improved. In addition, even when the aperture ratio is increased, it is possible to ensure the strength for rotating the filter. The aperture ratio will be described later.

  Moreover, it is preferable that the electric motor in which a rotating shaft is connected to the filter 10 can rotate the filter 10 in both directions (TD1 direction and TD2 direction). According to this, based on the relationship between the major axis direction of the slit hole and the rotation direction of the filter, the rotation direction of the filter can be selected according to the situation. For example, the direction in which the filter is rotated can be determined according to the purpose of use and the usage situation, such as when the quietness is emphasized during use or when oil collection is emphasized.

  That is, the filter 10 is rotated in the TD1 direction, which is the left rotation in the drawing, so that the long axis direction of the slit hole 11 is inclined so that the outer peripheral short side of the slit is inclined toward the filter rotation direction (TD1) from the central short side. Preferably, it is configured. In other words, the direction from the center side to the outer periphery side of the filter in the major axis direction of the slit hole 11 preferably includes a component of the rotation direction (TD1) of the filter 10. With such a configuration, as shown in Table 1, since the airflow resistance can be kept low, a large output motor is not required for the fan that generates the air flow, and as a result, the quietness of the entire apparatus is improved. To do.

  Further, the filter 10 is rotated in the TD2 direction, which is a clockwise rotation in the drawing, so that the long axis direction of the slit hole 11 is inclined so that the central short side of the slit is inclined in the filter rotation direction (TD2) from the short side of the outer periphery. Preferably configured. In other words, the direction from the outer periphery side to the center side of the filter in the major axis direction of the slit hole 11 preferably includes a component of the rotation direction (TD2) of the filter 10. With such a configuration, the oil collection rate becomes high, and oil adhesion on the downstream side of the filter air can be suppressed. Moreover, as shown in Table 2, the noise value of the filter itself is lowered, and the quietness is improved.

  A hole 11 ′ of the filter 10 ′ shown in FIG. 7B is a modification of the hole 11 shown in FIG. 7A. The difference is that the ventilation region 16 penetrates through each step, and In order to fit into the slit-shaped hole belonging to the step, there is no vortex-like portion where no slit exists, and the major axis direction of the hole 11 ′ contains more radial components. is there. Thereby, the aperture ratio can be further increased, and a filter that does not adversely affect the strength even when the aperture ratio is increased can be provided.

  A hole 11A of the filter 10A shown in FIG. 7C is a modification of the hole 11 shown in FIG. 7A. The difference is that the long side of the slit-shaped hole 11A is a straight line, and the long axis of the slit is shown. The direction includes only the radial component of the filter, that is, the slit holes are formed radially. According to this, even when washing with a cleaning tool such as a brush, there is little catching and the cleanability is improved.

  The hole 11A ′ of the filter 10A ′ shown in FIG. 7D is a modification of the hole 11 shown in FIG. 7A. The difference is that the long side of the slit-shaped hole 11A ′ is a straight line. The direction from the center side to the outer periphery side of the filter 10A ′ or the direction from the outer periphery side to the center side in the major axis direction of the hole 11A ′ includes a component in the rotation direction of the filter 10A ′. When the direction from the center side to the outer peripheral side includes a component in the rotational direction, as shown in Table 3, when the major axis direction of the slit includes only the component in the radial direction of the filter, that is, the slit holes are formed radially. Compared to the case, the ventilation resistance can be kept low, so that a motor with a large output is not required for the fan that generates the air flow, and as a result, the quietness of the entire apparatus is improved. In addition, when the direction from the outer peripheral side to the center side includes a component in the rotational direction, the oil collection rate is increased, and oil adhesion on the downstream side of the filter air can be suppressed. Moreover, as shown in Table 4, compared with the case where the slit holes are formed radially, the noise value of the filter itself is lowered, and the quietness is improved.

<Ventilation resistance and noise value measured in the filter of this example (including modifications)>
The table below shows the results of measuring ventilation resistance and noise values for the following filters and rotational directions. The measurement objects are as follows.

  The major axis direction of the slit-shaped hole shown in FIG. 7A includes a radial component of the filter, is convexly curved toward the outer peripheral side of the filter, and the circumferential component becomes closer to the peripheral edge. A filter composed of many curves, the direction from the center to the outer periphery of the filter in the major axis direction of the slit hole includes a component in the rotational direction (TD1 direction). For convenience, this measurement is referred to as a spiral forward measurement.

  The major axis direction of the slit-shaped hole shown in FIG. 7B includes a component in the radial direction of the filter, is curved convexly toward the outer peripheral side of the filter, and the component in the circumferential direction becomes closer to the peripheral edge. A filter composed of a large number of curves, and the direction from the outer periphery side to the center side of the filter in the major axis direction of the slit hole includes a component in the rotational direction (TD2 direction). For convenience, this measurement is referred to as a vortex retrospective measurement.

  When the long side of the slit-shaped hole shown in FIG. 7C is a straight line and the long axis direction of the slit is a radial filter including only the radial component of the filter ( TD1 direction). For convenience, this measurement is referred to as a radial measurement.

  The long side of the slit-shaped hole shown in FIG. 7D is a straight line, and the long axis direction of the slit includes both the radial component and the circumferential component of the filter, and the long axis of the slit hole The direction from the center side of the filter in the direction to the outer peripheral side includes a component in the rotational direction (TD1 direction). For convenience, this measurement is referred to as oblique slit forward facing.

  The long side of the slit-shaped hole shown in FIG. 7D is a straight line, and the long axis direction of the slit includes both the radial component and the circumferential component of the filter, and the long axis of the slit hole The direction from the outer peripheral side of the filter in the direction to the center side includes a component in the rotational direction (TD2 direction). For convenience, this measurement is referred to as oblique slit rearward facing.

Table 1 compares and compares the ventilation resistance by changing the number of rotations of the filter between 1000 rpm and 1500 rpm for the spiral forward and the spiral backward. According to this, the spiral backward indicates that the ventilation resistance is low and excellent at any number of rotations as compared with the spiral forward. Therefore, the spiral rear does not require a large output motor for the fan that generates the air flow, and as a result, the quietness of the entire apparatus is improved.

Table 2 shows a comparison of the noise values measured by changing the filter rotation speed between 1000 rpm and 1500 rpm for the spiral forward and the spiral backward. This indicates that the spiral forward is superior in that the noise value is low at any rotational speed compared to the spiral backward. Therefore, the spiral forward direction reduces the noise value of the filter itself and improves the quietness.

Table 3 shows a comparison between the radial resistance and the forward direction of the oblique slit by measuring the ventilation resistance while changing the filter rotation speed between 1000 rpm and 1500 rpm. According to this, the forward direction of the oblique slit has a low ventilation resistance at any number of rotations compared to the radial shape, indicating that it is excellent. Therefore, the spiral rear does not require a large output motor for the fan that generates the air flow, and as a result, the quietness of the entire apparatus is improved.

Table 4 shows a comparison of the noise values measured by changing the filter rotation speed to 1000 rpm and 1500 rpm for the radial and oblique slit backwards. According to this, the rearward direction of the oblique slit shows that the noise value is low and excellent at any rotational speed as compared with the radial shape. Accordingly, the rearward direction of the oblique slits reduces the noise value of the filter itself and improves the quietness.

The noise value was measured by connecting the oil collecting device placed in the anechoic chamber and the blower placed outside the room with a duct, and collecting the sound of only the oil collecting device. In the measurements shown in Tables 1 and 2, measurement was performed at an air volume of 300 m ³ / hour using a filter having an aperture ratio of about 37%. In the measurements shown in Tables 3 and 4, the aperture ratio was about 32. % Air flow rate was measured at 420 m ³ / hour. The width of the slits is all about 1.5 mm.

  The aperture ratio will be described with reference to FIGS. FIG. 8A shows an enlarged view of the vicinity of the center of the filter shown in FIG. Similarly, FIG. 8B shows the vicinity of the center of the filter shown in FIG. 7B, FIG. 8C shows the center of the filter shown in FIG. 7C, and FIG. Is. FIG. 9A1 is an enlarged view of the vicinity of the outer periphery of the filter shown in FIG. Similarly, FIG. 9 (C1) shows the vicinity of the outer periphery of the filter shown in FIG. 7 (C), and FIG. 9 (D1) shows the vicinity of the outer periphery of the filter shown in FIG. 7 (D). 9 (A2) shows the holes of the filter of FIGS. 8 (A) and 9 (A1), FIG. 9 (C2) shows the holes of the filter of FIGS. 8 (C) and 9 (C1), and FIG. (D2) schematically depicts the holes of the filter of FIGS. 8D and 9D1.

  This will be described in detail with reference to schematic diagrams (A2, C2, D2) of FIG. The aperture ratio refers to the ratio of the total area of the holes to the total area of the filter surface, and is determined by the total area of the holes and the total area of the surplus portions other than the holes. Note that the width (W) of the slit holes is constant in all the holes, and the arrangement intervals of the holes are arranged at the same angular intervals with the filter center as an axis.

  This figure (C2) shows the filter 10A in which the long side of the slit hole 11A is a straight line and includes only the component in the radial direction (radial direction). In this case, the distance (TCO) on the outer peripheral side of adjacent holes becomes longer in proportion to the length of the long side than the distance (TCI) on the center side. Further, FIG. (D2) shows a filter 10A ′ in which the long side of the slit hole 11A ′ is a straight line and includes both radial and circumferential components. In this case, the distance (TDO) on the outer peripheral side of adjacent holes is longer than the distance (TDI) on the center side, but since the long side is inclined in the radial direction, the rate of increase is the figure (C2). Less than shown. Further, in this figure (A2), the major axis direction of the slit hole 11 includes both components in the radial direction and the circumferential direction of the filter, and is curved convexly toward the peripheral edge portion 12 on the outer peripheral side of the filter. The filter 10 which has a curve which contains many components of the circumferential direction so that the part 12 is approached is shown. In this case, the distance (TAO) on the outer peripheral side of adjacent holes may be slightly longer than or substantially the same as the distance (TAI) on the center side.

Therefore, the following equation is established.
(TAO-TAI) <(TDO-TDI) <(TCO-TCI)

Between the adjacent holes is a surplus part. When the surplus portion is observed, the figure is greatly fan-shaped in (C2) ((TCO-TCI) is the largest), and it can be seen that the surplus portion area is larger than the slit hole area. In addition, the surplus portion in FIG. (D2) is not as large as (C2), but spreads like a fan ((TDO-TDI) is the second largest), and the surplus portion area is the slit hole area. It can be seen that it is a little larger than On the other hand, in the figure (A2), it is recognized that the surplus portion in FIG. (A2) is clearly larger than the distance (TAI) on the outer peripheral side compared to (D2). No ((TAO-TAI) is minimum). Then, the ratio of the area of the surplus portion is the area of the slit hole, which is the largest in this figure (C2) and the smallest in this figure (A2).

  In other words, the major axis direction of the slit hole shown in this figure (A2) includes both the radial direction and circumferential direction components of the filter, and curves convexly toward the peripheral edge on the outer peripheral side of the filter, In a so-called spiral slit hole that contains more components in the circumferential direction as it approaches the peripheral edge, the aperture ratio becomes the highest. Therefore, when the long side of the slit hole is a convex curve toward the outer periphery of the filter and the curve contains more components in the circumferential direction as it approaches the outer periphery of the filter, compared to when the long side of the slit is a straight line. Since the aperture ratio can be increased and the ventilation resistance can be kept low as a result, a large output motor is not required for the fan that generates the air flow, and the quietness of the entire apparatus is improved.

  Further, if the surplus portion is further observed, particularly in (C) and (D) of FIG. 8 representing the center portion of the filter, the width (TCI or TDI) of the surplus portion on the center side tends to be small. The strength of the rotating filter may not be ensured. On the other hand, since this does not occur in the so-called spiral slit hole, it is possible to ensure the strength for rotating the filter even if the aperture ratio is increased.

<Second Example>
FIG. 11 and FIG. 12 relate to the range hood 1B according to the present embodiment and explain the action of collecting the oil component accompanying the air flow in the range hood 1B. The range hood 1B includes an oil collecting device 100B, a fan 4B that generates an air flow A, and an inner panel 5B having a communication port 6B that communicates with the fan 4B. The oil collecting device 100B includes a mounting plate 50B attached to the communication port 6B, a disk-shaped filter 10B having a hole 11B through which air flow A passes, and a shaft 21B connected to the center of the disk of the filter 10B. An electric motor 20B for rotating 10B, an electric motor attachment 40B for attaching the electric motor 20B to the attachment plate 50B, and an oil collecting member 30B attached to the attachment plate 50B and positioned around the filter 10B. The oil collecting device 100B is located at the communication port 6B, and is provided on the upstream side of the fan 4B on the flow path of the air flow A.

  FIG. 11 shows the action of the air flow in the entire range hood 1B. The warmed air rises toward the range hood 1B together with steam, oily smoke, etc. generated by cooking performed below the range hood 1B. When the range hood 1B starts operation and the fan 4B starts to rotate, the fan 4B generates an air flow from the bottom to the top in the drawing. Then, the air rising around the rectifying plate 70B is sucked from between the rectifying plate 70B and the inner surface panel 5B, and then passes through the hole 11B of the filter 10B and is sucked into the fan 4B in the fan casing. Then, the air is discharged from the blower box 3B to the exhaust duct D.

  The rotational speed per unit time of the filter 10B 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 10B rotates at such a relatively high speed, the surface of the filter 10B (the surface portion 14B, which is a portion without the hole 11B) drags the air in contact with the surface by frictional force, and the air viscosity changes to the nearby air. However, since the movement is transmitted, an air movement is generated in the vicinity of the surface of the filter 10B, and the filter 10B is rotating. Therefore, the air movement becomes a vortex centered on the rotation axis.

  This spiral air movement occurs on both surfaces of the filter 10B, that is, both the lower surface and the upper surface of the filter 10B, in other words, both the upstream surface and the downstream surface of the air flow A of the filter 10B. In the present embodiment, since the air flow A generated by the fan 4B flows from the bottom to the top through the hole 11B of the filter 10B in the drawing, the movement of the vortex air flows downstream of the filter 10B. While being separated from the surface of the filter 10B, a spiral flow toward the outer peripheral edge of the filter 10B is generated and sucked by the fan 4B. On the other hand, on the upstream side of the filter 10B, the movement of the spiral air is pressed against the surface of the filter 10B, and a high-density air layer with a spiral flow toward the outer peripheral edge of the filter 10B is formed.

  FIG. 12 shows the action of the air flow in the oil collecting device 100B. 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 (surface portion 14B) of the filter 10B. 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 10B (surface portion 14B, which is a portion without the hole 11B), it is blown off in the direction of the peripheral edge 12B of the filter 10B. As a result, the oil component OP3 is collected as the oil component OP3 on the outer wall 32B of the oil component collecting member 30B provided so as to surround the outer peripheral end portion 12B of the disk-shaped filter 10B, and is collected in the oil reservoir 31 as the oil OL.

  As shown in FIG. 13A, the diameter DA (m) in the circumferential direction of the hole is the length of an 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 maximum value. 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.

  The diameter of the slit-shaped hole will be described with reference to FIG. The slit-shaped hole 11 shown in the figure is composed of a curve whose long side is convex toward the outer peripheral side of the filter 10 and contains more components in the circumferential direction as it approaches the outer periphery of the filter. The filter moves in the circumferential direction at a speed of V (m / sec) while drawing an arc from left to 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.

As described above, the diameter of the hole 11 in the circumferential direction is the maximum value of the length of an arc sandwiched between both ends of the hole 11 in concentric circles that cross the hole 11. Therefore, the length of the arc αβ is maximized from a curve in which the long side of the slit-shaped hole 11 is convexly convex toward the outer periphery of the filter 10 and contains more components in the circumferential direction as it approaches the outer periphery of the filter. Since it is configured, a straight line connecting the points α and β is the portion of the hole 11 from the outermost periphery of the filter. 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 11A in the circumferential direction to pass through one point (point γ) on a certain circumference is that the filter is in the TD direction. When rotating, it is the time from the point β passing through the point γ to the point α passing through the point γ. Further, when the radius outside the region where the hole exists in the filter is Rmax and the radius inside the region where the hole exists in the filter is Rmin, the region where the hole exists is outside Rmin and inside Rmax. , 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. 14 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 per second of the filter increases or as 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, 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. On the other hand, when the major axis direction of the slit hole is made coincident with the circumferential direction (tangential direction), the diameter DA in the circumferential direction of the hole is increased, and as a result, the average passage time tx of the hole diameter is increased, thereby increasing the oil collection rate. Will be reduced.

  In addition, when the oil component collides with the upstream surface of the filter (the surface portion of the portion without holes), 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. is there. 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.

  As described above, in the oil collecting device 100B, the motor 20B rotates the filter 10B, so that the oil contained in the air collides with the surface portion of the filter 10B, and the oil collecting member located around the filter 10B. It is scattered toward 30B and collected by the oil collecting member 30B. According to this, the oil collection device which has high oil collection efficiency in a state where pressure loss is small can be provided. That is, by rotating the filter so that the oil contained in the air collides with the surface of the filter and is scattered toward the oil collecting member located in the vicinity, the oil is less likely to adhere to the filter and cause clogging. Become. This reduces the cleaning effort of the filter itself and prevents pressure loss from increasing as it is used. In addition, the oil flow hardly adheres to the downstream part of the filter in the air flow path, so the downstream part of the filter is cleaned. / A range hood can be provided that greatly reduces the hassle of washing.

  FIG. 15 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 the conventional type slot filter and the oil adhesion to the downstream parts such as the fan and the duct. 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 results of this test are shown in Table 5. 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 the blower of the downstream part. 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, 83% of the oil is collected in the filter, and 2% of the oil is attached to the downstream part. This test was performed using a filter having a hole diameter of 1.5 mm and a rotation speed of 1500 rpm.

  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%. 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 has a collection rate of 83% regardless of the change in 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.

  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. That is, the invention has been illustrated and described with particular reference to particular embodiments, but with respect to the embodiments described above, without departing from the scope and spirit of the invention, the shape, material Various modifications can be made by those skilled in the art in terms of quantity, other details, and the like. Therefore, the description limited to the shape disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description in the name of the member excluding a part or all of the limitation is included in the present invention.

  For example, the oil collecting device is used by being incorporated in the range hood in the above, but it has been described as an example in which the oil collecting device is most effectively used, and it is not limited thereto. There is no. For example, the oil collecting device may be used as a device that collects oil and fat in air containing oil and fat as a separate body from the range hood.

DESCRIPTION OF SYMBOLS 1 Range hood 2 Hood part 3 Blower box 4 Fan 5 Inner panel 6 Communication port 7 Current plate 10 Filter 11 Hole 12 Peripheral edge part 13 Bending part 14 Surface part 15 Detachment tool 16 Ventilation area part 20 Electric motor 21 Shaft 30 Oil collecting member DESCRIPTION OF SYMBOLS 31 Oil reservoir 32 Outer wall 33 Extension part 34 Rising part 35 Ventilation opening part 40 Electric motor attachment 50 Attachment plate 51 Current plate attachment tool 100 Oil collecting device D1 Air flow direction TD Filter rotation direction

Claims (7)

A disk-shaped filter that captures oil in the air by rotating it with an electric motor on a flow path of air,
A plurality of holes having the shape of a slit through which the air flow passes,
The long axis of the slits, viewed contains a radial component of the filter,
The long side of the slit is a curve that is convex toward the outer periphery of the filter, and the curve includes more components in the circumferential direction as it approaches the outer periphery of the filter. The filter of claim 1 direction to the outer peripheral side from the center side of the filter in the long axis direction of the slit, characterized in that it comprises a rotation direction component of the filter. The filter of claim 1 direction to the center side from the outer peripheral side of the filter in the long axis direction of the slit, characterized in that it comprises a rotation direction component of the filter. A filter according to any one of claims 1 to 3 ,
An electric motor for rotating the filter;
An oil collecting member located around the filter;
An oil collecting device. When the electric motor rotates the filter, the oil contained in the air collides with the surface portion of the filter and is scattered toward the oil collecting member located around the filter, and the oil collecting member The oil collecting device according to claim 4 , wherein the oil collecting device is collected at a point. The motor, oil collecting apparatus according to claim 4 or 5, wherein the rotatable the filter in both directions. An oil collecting device according to any one of claims 4 to 6 ,
A fan that generates air flow,
An inner panel having a communication port communicating with the fan;
With
The oil collecting device is a range hood which is located at the communication port and is provided on the upstream side of the fan on the flow path of the air flow.