JP6498744B2 - Oil collector and range hood - Google Patents

Description

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

  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 collection device that achieves a high oil collection rate by collecting oil by rotating a disk-shaped filter at high speed (patent) Reference 1).

Japanese Patent Application No. 2011-290150

  In this high collection type oil collecting device, a filter cover for collecting oil and fat is provided around and below the disk-shaped filter that rotates at high speed, and the oil and fat that is captured and scattered by the filter is collected. In addition, oil and fat are prevented from dripping from the range hood.

  However, since a swirl flow generated by the rotation of the filter exists inside the filter cover, oil flows so as to circulate in the filter cover by the swirl flow. Further, particularly when the outer peripheral edge of the filter is bent downward, the collected oil gathers on the center side of the filter cover where the ventilation opening is located, and rotates around the ventilation opening. For this reason, when the amount of oil flowing with use increases gradually, the oil may overflow from the vent opening and drop downward. In order to avoid such a situation, it is conceivable to increase the allowable oil capacity by deepening the shape of the filter cover or increasing the width of the filter cover. When installing in a range hood, since the range which can be attached by the structure of the range hood main body will be restricted, it is not desirable.

  Therefore, the present invention prevents the collected oil from collecting toward the ventilation opening, reduces the oil flowing around the ventilation opening, and prevents the oil from overflowing from the ventilation opening. An object of the present invention is to provide an oil collecting device and a range hood.

In order to solve the above problems, a disk-shaped filter having a hole, an electric motor for rotating the filter, an oil collecting member including an oil reservoir for storing oil around the filter, and an air flow are generated. An oil collecting member, an inner wall that surrounds the peripheral edge of the filter, an extension that extends inward from the inner wall at the lower end of the inner wall, and an inner edge end of the extension, The inner edge end is closer to the filter than the lower end in the vertical direction, and the motor rotates the filter at 230 rpm or higher when the fan is generating air flow. The oil collecting device is characterized in that 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. Proposed It is.
According to this, in the oil collecting member, the trapped oil is not collected toward the vent opening by positioning the inner edge end on the vent opening side closer to the filter than the lower end on the inner wall side. Thus, it is possible to provide an oil collecting device that reduces oil flowing around the ventilation opening and prevents oil from overflowing from the ventilation opening. Furthermore, according to this, the oil collection apparatus which has high oil collection efficiency in a state with a small pressure loss can be provided. That is, by rotating the filter at high speed, the oil contained in the air collides with the surface of the filter and is scattered toward the oil collecting member located in the surrounding area, causing the oil to adhere to the filter and cause clogging. Less. 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. / It is possible to provide an oil collecting device that greatly reduces the labor of washing.

Moreover, in order to solve the said subject, a range hood provided with said oil collection apparatus can be provided.
According to this, while achieving high oil collection efficiency, it is possible to reliably collect the oil that has been captured and scattered by the filter, so that the collected oil is not collected toward the ventilation opening, The range hood which reduces the oil which flows so that it may circulate around and prevents oil from overflowing from a ventilation opening part can be provided. Furthermore, according to this, the oil collection apparatus which has high oil collection efficiency in a state with a small pressure loss can be provided. That is, by rotating the filter at high speed, the oil contained in the air collides with the surface of the filter and is scattered toward the oil collecting member located in the surrounding area, causing the oil to adhere to the filter and cause clogging. Less. 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.

  As described above, according to the present invention, the collected oil is not collected toward the ventilation opening, the oil flowing around the ventilation opening is reduced, and the oil flows from the ventilation opening. It is possible to provide an oil collecting device and a range hood that prevent the oil from overflowing.

(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) perspective view of oil collecting member of first embodiment according to the present invention, (B) sectional view of oil collecting device, (C) perspective view of oil collecting member of modification, (D) oil collecting Sectional drawing of a collector. (A) Perspective view of oil collecting member, (B) Cross section of oil collecting device, (C) Perspective view of oil collecting member, (D) Oil of second embodiment according to the present invention Sectional drawing of a collection apparatus. Action | operation explanatory drawing in the range hood of the 3rd Example which concerns on this invention. The action explanation enlarged view in the range hood of the 3rd example concerning the present invention. Explanatory drawing which shows the modification of the shape 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 3rd 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 3rd Example of the range hood which concerns on this invention, and a prior art. Sectional drawing of the oil collecting apparatus of 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 shaft 20 is connected to the center of the disk 10, the motor 20 rotates the filter 10, the motor attachment 40 for attaching the motor 20 to the attachment plate 50, and the attachment plate 50, and surrounds the outer peripheral edge of the filter 10. There is an oil collecting device 100 including an oil collecting member 30. 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.

  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. That is, when the oil collecting efficiency is improved by using a conventional slot filter, HEPA filter, or the like, or by making the slits finer or overlapping to form a multi-layer, the air passage of the filter has a complicated flow path. However, in the case of such a range hood 1, the oil collecting efficiency is increased by the rotation of the filter, so that 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 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 device 100 includes 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 connected to the center of the disk of the filter 10. An electric motor 20 to be rotated, 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 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 filter 10 is detachably attached to the distal end portion of the shaft 21 of the electric motor 20 by the detachable tool 14 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 from a circular metal flat plate having holes 11. The filter 10 has a bent portion 13 that bends in a circumferential manner so that the peripheral edge 12 is positioned away from the electric motor 20 inside the peripheral edge 12 that is the outer periphery of the filter 10. The peripheral edge 12 is positioned below in the vertical direction in the drawing as compared to the surface 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 bending portion may be a bending portion that does not bend with a larger curvature as it is bent, but bends with a smaller curvature.

  The hole 11 of the filter 10 is formed of a slit that is closer to the center in the radial direction and gradually approaches the circumferential direction toward the outer periphery. Moreover, the length of the slit is also shorter at the center and is gradually increased as it goes to the outer periphery. In the case of this example, the circumferential width of the slit is approximately 1.5 mm. 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. The shape of the hole may be any shape such as a circle, a triangle, a square, or a regular polygon.

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 inner wall 32 at the lower end portion of the inner wall 32 in order to prevent the oil and fat from dripping from the range hood, and the inner wall 32 that catches and scatters the oil that surrounds the peripheral edge 12. The filter 10 includes 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 inner edge end portion of the extending portion 33 toward the filter 10 so as to surround the ventilation opening 35. the collected oil from 10 comprises a reservoir Meteoku oil sump 31.

  As shown in FIG. 5, the oil collecting device 100 allows the user to 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 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 detachable tool 14, and is held by the detachable tool 14 being engaged with the shaft 21 of the electric motor 20. The user can easily operate the detachable tool 14 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.

  Prior to describing the oil collecting member 30 of the present embodiment in detail, the oil collecting member 30Z of the prior art will be described with reference to FIG. The oil collecting member 30Z has an inner wall 32Z that surrounds the peripheral edge portion 12Z of the rotating filter 10Z connected to the electric motor 20Z at an approximately equal distance. That is, the inner wall 32Z is disposed so as to surround the entire periphery of the peripheral edge portion 12Z of the filter 10Z. The oil collecting member 30Z includes an extending portion 33Z extending inward from the inner wall 32Z at the lower end portion 322Z of the inner wall 32Z, and a rising portion 34Z rising from the inner edge end portion 333Z of the extending portion 33Z toward the filter 10Z. Have. Then, the lower end portion 322Z and the inner edge end portion 333Z are substantially at the same position in the vertical direction, and the extending portion 33Z is substantially parallel to the surface portion of the filter 10.

  In this prior art oil collecting member 30Z, the oil and fat collected on the upper surface of the extending portion 33Z starts to accumulate as it is used. A swirl flow generated by the rotation of the filter 10Z exists inside the oil collecting member 30Z, which is at a short distance from the peripheral edge 12Z of the filter 10Z. Therefore, the oil (OL) is converted into oil by the swirl flow. Flow around the inside of the collecting member 30Z, particularly in the inner edge end portion 333Z which is a joint portion between the extending portion 33Z and the rising portion 34Z, and in the lower end portion 322Z which is a joint portion between the extending portion 33Z and the inner wall 32Z. To do. Therefore, as the amount of oil that gradually flows increases, as indicated by the arrows in this figure, the oil (OL) drops over the rising portion 34Z and drops downward, and the upper surface of the rectifying plate 7 and the cooking device are soiled. Will end up.

  On the other hand, the oil collecting member 30 in the present embodiment is as follows. A description will be given with reference to FIGS. In order to avoid repeated description, the description will focus on differences from the prior art. In the oil collecting member 30, an inner edge end portion 333 located on the innermost side of the extending portion 33 and in contact with the ventilation opening portion 35 is moved to the filter 10 from the lower end portion 322 located on the lowermost side of the inner wall 32 in the vertical direction. close. That is, the inner edge end portion 333 is positioned above the lower end portion 322 as viewed in FIG. Then, the extending portion 33 that extends inward from the lower end portion 322 and is formed between the inner edge end portion 333 is positioned closer to the upper side near the filter 10 on the inner side near the vent opening 35, The outer side closer to the inner wall 32 is positioned farther away from the filter 10 and below.

  Although the oil collecting device 100 may be installed with a slight inclination, it is installed almost as shown in the figure, so that the vertical position of the inner portion and the outer portion of the extending portion 33 is also in use. The relationship does not change. Therefore, the fats and oils accumulated in the extending part 33 are collected outside the extending part 33. According to this, in the oil collecting member 30, the inner edge end portion 333 on the ventilation opening 35 side is positioned closer to the filter 10 than the lower end portion 322 on the inner wall 32 side, so that the collected oil is vented. It is possible to prevent the oil from flowing out from the ventilation opening 35 by reducing the oil flowing so as to circulate around the ventilation opening 35 so as not to collect toward the portion 35.

  Further, the filter 10 has a circumferential bent portion 13 that bends so that the peripheral edge portion 12 is located away from the electric motor 20, and the upper end portion 342 of the rising portion 34 is a peripheral edge portion in the vertical direction. It is preferably located above 12. According to this, even when the peripheral edge portion 12 of the filter 10 is bent downward or the like, it is possible to prevent oil from overflowing from the ventilation opening 35.

  Furthermore, the inner edge end portion 333 is preferably located above the peripheral edge portion 12 in the vertical direction. According to this, even if the peripheral edge portion 12 of the filter 10 is bent downward or the like, it is possible to reliably prevent oil from overflowing from the ventilation opening 35.

<Modification of the first embodiment>
With reference to FIGS. 7C and 7D, a modification of the present embodiment will be described. In order to avoid duplication, the description will focus on differences from the above embodiment. The oil collecting member 30 ′ has a circumferential step 334 ′ between the inner edge end portion 333 ′ and the lower end portion 322 ′ so that the inner edge end portion 333 ′ is closer to the filter 10 ′. By doing so, even if the extending portion 33 ′ is parallel to the surface portion of the filter 10 ′, the inner edge end portion 333 ′ is closer to the filter 10 ′ than the lower end portion 322 ′ in the vertical direction. According to this, it is possible to prevent oil from being collected toward the ventilation opening 35 ′ by providing the step 334 ′. The step 334 ′ is preferably located at the rising portion 34 ′ because the capacity for storing oil is reduced when the step 334 ′ is at the inner wall 32 ′.

<Second Example>
The present embodiment will be described with reference to FIG. In order to avoid duplication, the description will focus on differences from the above embodiment. Most of the rising portion 34A of the oil collecting member 30A surrounds the peripheral edge 12A of the filter 10A from the inside. That is, most of the rising part 34A has a substantially constant curvature larger than the curvature of the peripheral edge part 12A, and the shortest distance between the rising part 34A and the peripheral edge part 12A in this part is substantially constant.

  On the other hand, as shown in this figure (A), a part of the rising portion 34A located on the back side has a small curvature portion 341A having a curvature smaller than the curvature of the peripheral edge portion 12A (including a plane portion having a curvature of 0). And a large curvature portion 343A that bends greatly on both sides of the small curvature portion 341A. The shortest distance to the peripheral edge portion 12A in the small curvature portion 341A is larger than the shortest distance in the most part other than the small curvature portion 341A, and the small curvature portion 341A is separated from the peripheral edge portion 12A. According to this, since there is a part away from the peripheral edge part 12A of the filter in a part of the rising part 34A, the part becomes an oil reservoir 31A in which the recovered oil stays, and the recovered oil repeatedly flows around the circumference. Can be suppressed.

<Modification of the second embodiment>
A modification of this embodiment will be described with reference to FIGS. In order to avoid duplication, the description will focus on differences from the above embodiment. The oil collecting member 30A ′ has a step 334A ′ between the inner edge end portion 333A ′ and the lower end portion 322A ′ in the vicinity of the rising portion 34A ′ so that the inner edge end portion 333 ′ is closer to the filter 10A ′. Thus, even if the extending portion 33A ′ is parallel to the surface portion of the filter 10A ′, the inner edge end portion 333A ′ is closer to the filter 10A ′ than the lower end portion 322A ′ in the vertical direction. According to this, by providing the step 334A ′, it is possible to prevent oil from being collected more toward the ventilation opening 35A ′. The step 334A ′ is preferably located closer to the rising portion 34A ′ because the capacity for storing oil is reduced when the step 334A ′ is located on the inner wall 32A ′.

<Third embodiment>
FIG. 9 and FIG. 10 are for explaining the action of collecting the oil accompanying the air flow in the range hood 1B with respect to the range hood 1B according to the present embodiment. 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. 9 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 7B is sucked from between the rectifying plate 7B and the inner panel 5B, and then passes through the hole 11B of the filter 10B and is sucked into the suction port 42B of 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 a relatively high speed in this way, the surface (surface portion) of the filter 10B drags the air in contact with the surface by a frictional force, and the movement is transmitted to nearby air due to the viscosity of the air. The movement of air occurs near the surface of the filter 10B, and the filter 10B rotates. Therefore, the movement of air 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. 10 shows the action of the air flow in the oil collecting apparatus 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 15B) 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 (surface portion 15B) of the filter 10B, it is flipped off in the direction of the peripheral edge 12B of the filter 10B. As a result, the oil collecting member 30B provided so as to surround the peripheral edge of the disk-shaped filter 10B is collected as the oil OP3 and is collected in the oil reservoir 31 as the oil OL.

  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 11B 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 11B and on the same circumference of the rotation center, and point γ is a midpoint of the arc αβ. Therefore, the points α and β are one end and the other end of the diameter of the hole 11B 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 11B. 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.

  FIGS. 11B1 and 11B2 show a filter 10B having holes of slits 11B having the same slit width. However, these slits 11B are formed from slits that are closer to the center in the radial direction and gradually approach the circumferential direction toward the outer periphery. Then, even if they have the same slit width, the DA in the portion close to the center portion of the filter 10B and the portion close to the outer edge are different. However, even in such a case, as described above, by obtaining the average value in the filter 10B, the time required to pass one point on the circumference can be obtained.

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 according to the dotted regression curve considering the 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 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 hole was circular, and 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.

  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, the oil collecting device 100B causes the oil contained in the air to collide with the surface portion 15B of the filter 10B by the motor 20B rotating the filter 10B, and collects the oil contained around the filter 10B. It is scattered toward the member 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 at high speed, the oil contained in the air collides with the surface of the filter and is scattered toward the oil collecting member located in the surrounding area, causing the oil to adhere to the filter and cause clogging. Less. 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. 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.

  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 Detachment tool 15 Surface part 20 Electric motor 21 Shaft 30 Oil collecting member 31 Oil reservoir 32 Inner wall 321 Upper end portion of inner wall 322 Lower end portion of inner wall 33 Extending portion 331 Upper surface of extending portion 333 Inner edge end portion 334 Step 34 Rising portion 341 Small curvature portion 342 Upper end portion 343 Large curvature portion 35 Ventilation opening portion 40 Electric motor fitting 50 Mounting plate 100 Oil collecting device D1 Air flow direction

Claims (2)

A disc-shaped filter having holes;
An electric motor for rotating the filter;
An oil collecting member comprising an oil reservoir for collecting oil located around the filter;
And a fan for generating an air flow,
The oil collecting member is
An inner wall surrounding a peripheral edge of the filter;
An extending portion extending inward from the inner wall at the lower end of the inner wall;
A rising portion rising from the inner edge of the extending portion toward the filter;
Have
The inner edge end portion is closer to the filter than the lower end portion in the vertical direction,
When the fan generates an air flow, the electric motor rotates the filter at 230 rpm or more, so that oil contained in the air collides with the surface portion of the filter and is located around the filter. An oil collecting device, wherein the oil collecting device is scattered toward the oil collecting member and collected by the oil collecting member. An oil collecting device according to claim 1;
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.