JP6585349B2 - Blower fan, blower and range hood - Google Patents

Description

  The present invention relates to a blower fan, a blower, and a range hood, and more particularly, to a blower fan, a blower, and a range hood that collect oil from oily smoke in the air and exhibit remarkable oil collection efficiency.

  A range hood installed in a kitchen or the like inhales steam or smoke generated by cooking under the range hood together with the air flow generated by the fan, and the oil smoke or the like together with the inhaled air to the outdoors. It is what is discharged. However, it is not environmentally preferable to discharge the oil contained in the oil smoke to the outside as it is, and the oil is attached to equipment such as fans and ducts that are usually present downstream of the hood in the air flow path. Therefore, a great amount of labor / cost is required for maintenance such as cleaning.

  Therefore, conventionally, since the range hood captures and collects the oil contained in the oil smoke in a filter or the like, many devices have been made to increase the oil collection efficiency. For example, Patent Document 1 discloses a range hood that aims to improve oil removal efficiency without reducing exhaust efficiency. This range hood is provided with a hood having a suction port and a discharge port above the kitchen appliance, and a centrifugal fan having a plurality of blades coupled to an electric motor in the vicinity of the discharge port of the hood, An oil collecting part for attaching oil to the inside of the centrifugal fan is provided. Thereby, since exhaust air is applied to an oil collection part and oil is made to adhere to an oil collection part, the removal efficiency of oil can be improved, without reducing exhaust efficiency.

  Further, increasing the oil collection efficiency means that a large amount of oil adheres to an oil collection member represented by a filter, and therefore, many devices have been made to wash and remove the attached oil as easily as possible. ing. For example, conventionally, an impeller having a plurality of blades arranged in a cylindrical shape as a blower (sirocco fan) has been used in many technical fields to generate an air flow. There are the following as cleaning materials.

  For example, Patent Literature 2 discloses a range hood that aims to reduce redeposition of washed oil smoke and dust on an oil collecting mechanism. This range hood has a metal oil collecting mechanism on the circumferential surface of the impeller, a cleaning tank is provided so that the oil collecting mechanism is immersed in the cleaning liquid, and the cleaning liquid is placed in the center of the impeller. A watering means is provided by a watering nozzle connected by a water storage device for storing water and a water supply pump. As a result, the oil and dust adhering to the oil collecting mechanism portion are peeled off from the oil collecting mechanism portion each time, so that redeposition of washed oil smoke and dust on the oil collecting mechanism portion can be reduced. .

  Patent Document 3 discloses a range hood that aims to reduce the labor of cleaning an oil collecting mechanism portion and an exhaust impeller on which oil and dust are adhered and accumulated. This range hood is installed above or around the cooker and has a hood provided with a ventilation path by communicating a suction port for sucking contaminated air and a blower casing containing an exhaust impeller, and the ventilation path An oil collecting mechanism that is rotated by driving means, a cleaning casing for immersing the oil collecting mechanism, a nozzle for supplying water, a water supply pump, and a drainage device for sewage scattered in the cleaning casing. And an oil collecting mechanism for collecting dirt on the exhaust impeller. As a result, the oil collecting mechanism and the exhaust impeller can be cleaned by the same cleaning means, and dirt such as oil and dust can be removed without removing the oil collecting mechanism and the exhaust impeller.

JP 2013-148269 A JP 2013-044470 A JP 2013-044771 A

However, in the above prior art, although the oil collection efficiency can be increased, the oil collection mechanism is provided on the circumferential surface of the impeller, so that the oil collection mechanism extends over the entire length of the blade. Since it has the shape along, the oil collected by the oil collecting mechanism part moves to the blade part existing outside by centrifugal force, and the blade part becomes dirty (Patent Documents 2 and 3). Moreover, in patent document 1 using a ring-shaped oil collection part, the oil stains etc. which are directly contained in oil smoke will adhere to the blade part which does not have an oil collection part.
Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to improve the efficiency of collecting oil in the air while ensuring a sufficient air volume, An object of the present invention is to provide a blower fan, a blower, and a range hood that reduce adhesion and improve maintainability (reduces labor for cleaning / washing).

In addition, in order to reduce oil adhesion to the impeller and improve maintainability, it is necessary to identify and concentrate the part that collects oil, and to efficiently wash the part. In order to clean the oil adhering to the blades of a car, a cleaning casing for immersing the blades and the like is required, and a large-scale device is required (Patent Documents 2 and 3). In addition, since it is difficult to provide a deep immersion depth, it is not possible to clean the entire center of the impeller.
Therefore, in the present invention, a fan that improves the maintainability of the equipment downstream of the impeller in the air flow path and the impeller itself by washing the filter in which the oil component is intensively attached without using a large-scale device, and Provide range hood.

In order to solve the above problem, an impeller having a plurality of blades arranged in a cylindrical shape, a power transmission member that transmits a rotational force to the impeller, the impeller, the power transmission member, or the rotational force is generated. An air blower fan that is attached to a rotating shaft of an electric motor and includes a filter having a hole through which an air flow generated by rotation of the impeller passes, wherein the impeller has a plurality of blades arranged in a cylindrical shape. A route in which the air flow sucked from the suction port passes through the gap between the blades and directly outside the filter without passing through the filter, and the air flow flows from the suction port to the filter. then through the gap between the vanes through the holes to provide two routes of the route to be discharged to the outside, while ensuring a sufficient air volume to improve the collection efficiency of the oil in the air, wings To thereby reduce the oil content is attached, by intensively adhered to filter oil, it can provide a blower fan to enhance the downstream equipment and the impeller maintainability of itself from the impeller in an air flow path.

Furthermore, the position in the rotation axis direction where the filter is attached to the impeller, the position in the rotation axis direction where the power transmission member is attached to the impeller when the filter is attached to the impeller, or the rotation where the filter is attached to the rotation shaft The position in the axial direction is between the position of the upstream suction port of the air flow and the position downstream of the position of the suction port by a half of the length in the rotational axis direction of the impeller. Also good.
According to this, when the position where the filter is attached is the position of the suction port, it is possible to reduce the adhesion of oil over the entire blade of the impeller, and the position where the filter is attached is the central position in the axial direction of the blade. Secures a sufficient air flow without increasing the airflow resistance and reduces the adhesion of oil over half of the blade, and ensures a moderate air flow when the filter is installed between the center of the blade and the suction port Thus, it is possible to reduce the adhesion of oil to the blades on the downstream side from the attachment position.

Further, the filter may be provided over the entire inner diameter of the impeller.
According to this, almost all the air flowing through the inside of the impeller passes through the hole of the filter, so that the efficiency of collecting oil in the air can be improved.

Furthermore, the filter may be provided on the power transmission member.
According to this, by attaching to the power transmission member which is an essential part, the oil collecting efficiency is improved without reducing the performance as a blower fan, and the number of members is reduced, which contributes to cost reduction.

Further, the filter may be detachably attached to the impeller, the power transmission member, or the rotating shaft of the electric motor.
According to this, it is sufficient to remove the filter at the time of maintenance and make it easy to wash, so that maintenance is improved.

Further, the hole may have a slit shape, and the major axis direction of the slit may include a radial component of the filter.
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. Therefore, it is possible to provide a filter that has little catching and improved maintainability.

Furthermore, the long side of the slit may be a curve that is convex toward the outer periphery of the filter, and the curve may include more components in the circumferential direction as it approaches the outer periphery of the filter.
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. Quietness is improved. In addition, even when the aperture ratio is increased, it is possible to ensure the strength for rotating the filter.

Furthermore, the position in the rotation axis direction where the filter or the power transmission member is attached to the impeller is substantially the same as the position in the rotation axis direction of the central portion of the filter, or the position in the rotation axis direction where the filter is attached to the rotation axis of the electric motor. The position may be substantially the same as the position in the rotation axis direction on the outer periphery of the filter.
According to this, a filter can be attached with a simple structure.

Further, the filter surface of the filter may be substantially perpendicular to the rotation axis of the impeller.
According to this, the filter can have a simple structure.

Furthermore, the position in the rotation axis direction where the periphery of the filter is attached to the impeller, or the position in the rotation axis direction where the power transmission member is attached to the impeller when the periphery of the filter is attached to the impeller is the center of the filter. Unlike the position of the rotation axis direction of the part, the position of the rotation axis direction of the central part is farther from the upstream suction port of the air flow than the position of the surrounding rotation axis direction, or the rotation where the filter is attached to the rotation axis The position in the axial direction is different from the position in the direction of the rotation axis around the filter, and the position in the direction of the surrounding rotation axis is from the upstream suction inlet of the air flow compared to the position in the rotation axis direction where the filter is attached to the rotation axis. It may be characterized by being close.
According to this, since the area of the filter is increased, the airflow resistance can be reduced and the air volume can be increased.

In order to solve the above-mentioned problems, an electric motor having a rotating shaft attached to the center of the power transmission member of the fan fan is provided, and the electric motor is provided with a fan for rotating the fan fan.
According to this, it is possible to improve the collection efficiency of oil in the air while ensuring a sufficient air volume, reduce the oil from adhering to the impeller, and attach the oil to the filter intensively, The blower which improves the maintainability of the installation downstream of the impeller in a road and the impeller itself can be provided.

In order to solve the above-mentioned problem, there is provided a range hood that collects oily smoke generated by cooking, and includes the above blower and a blower box that houses the blower.
According to this, it is possible to improve the collection efficiency of oil in the air while ensuring a sufficient air volume, reduce the oil from adhering to the impeller, and concentrate the oil without using a large-scale device. By cleaning the attached filter, it is possible to provide a range hood that improves the maintainability of the equipment downstream of the impeller in the air flow path and the impeller itself. Furthermore, it is not necessary to separately provide a filter part for capturing oil from oil smoke, and the oil is intensively captured by the blower part, so that the number of cleaning parts is reduced and the maintainability can be improved.

Furthermore, a tank for storing the cleaning liquid, a nozzle for directly injecting the cleaning liquid from the tank to the filter surface on the upstream side of the air flow of the fan fan filter, and a discharge port for the cleaning liquid at the lower part of the fan casing for storing the fan, Furthermore, it is good also as providing.
According to this, it is possible to automatically wash the filter in which the oil component is concentrated in the range hood, and it is possible to improve the maintainability. Further, since only the filter needs to be cleaned, it is possible to easily clean by spraying the cleaning liquid from the nozzle, and there is no need to use a large-scale apparatus.

Furthermore, the oil content adsorption member which adsorb | sucks the oil content contained in a washing | cleaning liquid is further provided, and a tank may collect | recover the washing | cleaning liquid which flows out from a discharge port via an oil content adsorption member.
According to this, since the dirty cleaning liquid is used after being circulated without oil, cleaning with a slight cleaning liquid becomes possible.

Furthermore, the oil component adsorbing member may be provided in a tank.
According to this, the oil adsorbing member may be set in the tank when the cleaning liquid is put in the tank before cleaning, and the oil adsorbing member may be discarded when the dirty cleaning liquid in the tank is discarded after cleaning. , Can save time and effort.

Further, the nozzle may be characterized by spraying linearly with respect to the filter surface over the region having the filter holes.
According to this, since the cleaning liquid can be efficiently and strongly collided over the entire filter surface, the filter can be effectively cleaned.

  As described above, according to the present invention, the collection efficiency of oil in the air is improved while securing a sufficient air volume, the oil is prevented from adhering to the impeller, and a large-scale apparatus is used. By cleaning the filter on which the oil component is intensively attached, it is possible to provide a blower fan, a blower, and a range hood that improve the facilities downstream of the impeller in the air flow path and the maintainability of the impeller itself.

BRIEF DESCRIPTION OF THE DRAWINGS (A) Front view, (B) Bottom view, (C) Right side view, (D) Top view of the first embodiment of the range hood according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS (A) The perspective view seen from the upper right of the 1st Example of the range hood which concerns on this invention, (B) The perspective view seen from the lower right. Sectional drawing in the AA cross section of the 1st Example of the cooker hood which concerns on this invention. Sectional drawing in the BB cross section of the 1st Example of the cooker hood which concerns on this invention. The expansion | deployment perspective view seen from the lower right of the 1st Example of the cooker hood which concerns on this invention. Explanatory drawing explaining the washing | cleaning mechanism of the 1st Example of the range hood which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS (A) Front view, (B) Bottom view, (C) Top view, (D) Right side view, (E) Left side view, (F) Back view of the first embodiment of the blower according to the present invention. Sectional drawing in CC cross section of the 1st Example of the air blower concerning this invention. BRIEF DESCRIPTION OF THE DRAWINGS (A) The perspective view seen from the upper right of the 1st Example of the air blower concerning this invention, (B) The perspective view seen from the lower right. BRIEF DESCRIPTION OF THE DRAWINGS (A) Front view, (B) Top view, (C) Left side view, (D) Back view, (E) Cross section in DD section of the first embodiment of the blower fan according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS (A) The perspective view seen from the upper right of the 1st Example of the air blower fan which concerns on this invention, (B) The expansion | deployment perspective view seen from the lower right. (A) Front view, (B) Bottom view, (C) Plan view, (D) Rear view, (E) Left side view, (F) EE cross section of the first embodiment of the filter according to the present invention. FIG. Action | operation explanatory drawing in the 1st Example of the air blower fan which concerns on this invention. The action explanation enlarged view in the 1st example of the air blower fan (filter) concerning the present invention. (A) Front view, (B) Top view, (C) Right side view, (D) Rear view, (E) Cross section in FF section of the second embodiment of the blower fan according to the present invention. The perspective view seen from the upper right of the 2nd example of the air blower fan concerning the present invention. (A) Front view, (B) Top view, (C) Right side view, (D) Back view, (E) Cross section in GG section of the third embodiment of the blower fan according to the present invention. The perspective view seen from the upper right of the 3rd example of the air blower fan concerning the present invention.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
<First Example>
1 to 4 show a range hood 1 according to a first embodiment of the present invention. The range hood 1 includes a thin hood portion 2 having a concave inner panel 4 on the inner surface for collecting steam, oily smoke, and the like generated by cooking performed below. The hood portion 2 is coupled to the blower box 3 connected to the exhaust duct D in the vicinity of the communication port 6 located at the approximate center thereof. Moreover, the hood part 2 is equipped with the baffle plate 5 below, raises the wind speed around the hood part 2, and makes it easy to capture the oil smoke etc. which stand up from the downward direction. Further, a tank storage cover 44 for storing a tank to be described later is provided near the back side of the bottom surface of the hood 2.

  The blower box 3 includes an introduction unit 7 that introduces an air flow A <b> 1 including oil smoke captured by the hood unit 2 into the blower box 3 through the communication port 6, and a blower 20. The introduction unit 7 rises in the vertical direction while having a cross-sectional area substantially equal to the area of the communication port 6 from the communication port 6, and introduces the air flow A <b> 1 to the fan casing intake port 24. The fan casing intake port 24 is surrounded by a bell mouth 25 and is configured to smoothly draw in the air flow A2.

  The blower 20 is a sirocco fan (impeller) inside and generates a flow of air (A1 / A2) by rotating, a fan casing 23 provided so as to surround the blower fan 30, and a blower A substantially horizontal rotating shaft 22 is attached to the center of a power transmission member (described later) of the fan 30, and includes an electric motor 21 that rotates the blower fan 30 and a cleaning mechanism 40 for cleaning the blower fan 30 (FIGS. 4 to 4). 9). The blower fan 30 is arranged so that the suction port 37 of the blower fan 30 matches the fan casing intake port 24 of the blower 20, and smoothly sucks the air flow A2 generated by itself. When the blower fan 30 operates, the pressure around the communication port 6 becomes negative pressure, and the air below the inner panel 4 passes through the introduction part 7 and the blower 20 and is discharged to the outside through the exhaust duct D.

  The fan casing 23 has a fan casing intake port 24 and a fan casing exhaust port 27. After the oil component is removed from the air containing the oil component sucked from the fan casing intake port 24 as will be described later, clean air is exhausted from the fan casing. Drain from the mouth 27. The type of the electric motor 21 is not particularly limited. The electric motor 21 has a capability of rotating at least about 200 rpm per unit time, but is not limited to this.

  In the conventional range hood, the filter provided in the vicinity of the communication port 6 usually removes the oil content in the smoke smoke that is sucked in the air flow A1, but in the range hood according to the present embodiment, as will be described later. In addition, since the blower fan 30 includes the filter 33, it is not necessary to provide a filter near the communication port 6.

  A cleaning mechanism 40 for cleaning the blower fan 30 will be described with reference to FIGS. 5 and 6. The cleaning mechanism 40 includes a tank 41 that is stored in a tank storage unit 43 that is located near the back side of the bottom surface of the hood unit 2, stores a cleaning liquid, a cleaning liquid suction port 45 that sucks up the cleaning liquid from the tank 41, and a cleaning liquid suction port The cleaning liquid sucked up from 45 is drawn to the front side, which is the upstream side of the air flow of the blower fan 30, and the upstream side of the air flow with respect to the blower fan 30 is supplied from the cleaning liquid pipe 49. A nozzle 46 that directly injects the cleaning liquid from the upstream side of the air flow onto the filter surface of the filter (described later) of the rotating fan fan 30, and a fan casing that collects the cleaning liquid sprayed by the nozzle 46 onto the filter surface 23, a fan casing cleaning liquid discharge port 26 for discharging the cleaning liquid recovered by the fan casing 23 toward the tank 41, and a fan In a position matching the casing cleaning liquid discharge port 26, and the cleaning liquid discharge port 47 for returning the cleaning liquid fan casing cleaning liquid discharge port 26 is discharged from the fan casing 23 to the tank 41. Although not shown in the drawings, a pump for sucking the cleaning liquid from the cleaning liquid suction port 45 and generating water pressure for ejecting the cleaning liquid from the nozzle 46 is provided.

  Furthermore, a tank lid 42 serving as a lid for the tank 41 and an oil adsorbing member 48 that is disposed on the tank lid 42 and adsorbs the oil contained in the cleaning liquid may be provided. The tank lid 42 has a hole through which the cleaning liquid suction port 45 penetrates, and a lattice-shaped hole on which the oil adsorbing member 48 is placed so as to be replaceable and the cleaning liquid recovered from the cleaning liquid discharge port 47 is returned to the tank 41. The tank 41 collects the cleaning liquid flowing out from the cleaning liquid discharge port 47 via the oil adsorption member 48. By doing so, the dirty cleaning liquid is used after being circulated after removing the oil, so that cleaning with a slight amount of cleaning liquid becomes possible. Further, the oil adsorbing member 48 is placed on the tank lid 42 so as to be replaceable, so that the oil adsorbing member only needs to be set in the tank when the cleaning liquid is put into the tank 41 before cleaning. Since the oil adsorbing member 48 has only to be discarded when the dirty cleaning liquid is discarded, labor can be reduced.

  The oil adsorbing member 48 is preferably made of a material that adsorbs only oil without adsorbing moisture. According to this, in the cleaning mechanism 40 that circulates the cleaning liquid, the oil adsorption member 48 can adsorb and remove only the oil contained in the circulating cleaning liquid.

  The nozzle 46 sprays linearly with respect to the filter surface over a region having filter holes. According to this, since the cleaning liquid can be efficiently and strongly collided over the entire filter surface, the filter can be effectively cleaned. According to this, it is possible to improve the collection efficiency of oil in the air while ensuring a sufficient air volume, reduce the oil from adhering to the impeller, and concentrate the oil without using a large-scale device. By washing the adhering filter, it is possible to provide a range hood and a blower that improve the maintenance of the equipment downstream of the impeller in the air flow path and the impeller itself. Furthermore, it is not necessary to separately provide a filter part for capturing oil from oil smoke, and the oil is intensively captured by the blower part, so that the number of cleaning parts is reduced and the maintainability can be improved. In addition, the area | region which has a hole of a filter is a range which connects the minimum radius position where a hole exists in a filter, and the maximum radius position where a hole exists. Further, the term “injecting linearly with respect to the filter surface over the region having the filter holes” means injecting linearly so as to cross the range connecting the aforementioned minimum radius position and maximum radius position. The linear shape may be a linear shape or a curved shape, and a plurality of lines may cross a range connecting the minimum radius position and the maximum radius position.

  Further, a microbubble generator may be further provided, and the nozzle 46 may inject a cleaning liquid containing fine air bubbles. Thereby, the cleaning power can be further increased by utilizing the oil adsorbing power of the fine bubbles in the cleaning liquid.

  The blower fan 30 will be described with reference to FIGS. 10 to 12. The blower fan 30 is generated when an impeller 32 having a plurality of blades 31, a power transmission member 35 that transmits a rotational force to the impeller 32, and a periphery of the power transmission member 35 are attached to the impeller 32. And a filter 33 having a slit-like hole 34 that allows a flow of air to pass therethrough. The impeller 32 rotates by rotating the rotating shaft 36 by the electric motor 21, sucks air from the suction port 37, and discharges it to the outside of the blade 31.

  The power transmission member 35 is attached to each blade 31 in order to transmit the rotational force to the impeller 32, and transmits the rotational force from the electric motor 21 to drive the impeller 32. At the center of the power transmission member 35, the rotating shaft 36 of the impeller 32 is detachably and firmly coupled to the rotating shaft 22 of the electric motor 21. The power transmission member 35 includes a hub portion that surrounds the rotation shaft 36, a peripheral portion that is attached to the blade 31, and five spoke portions that connect the hub portion and the peripheral portion.

  The filter 33 includes a hole 34, and a part of the air sucked from the suction port 37 passes through the hole 34. The filter 33 has a periphery P attached to the peripheral portion of the power transmission member 35 and a central portion C also attached to the hub portion of the power transmission member 35. Furthermore, the filter 33 of the present embodiment is composed of five, and is attached to the spoke portion of the power transmission member 35 at each joint. The filter 33 according to the present embodiment includes five members and is fixed to the power transmission member 35. However, the filter 33 is not limited to this. For example, the filter 33 includes one member, the impeller 32, the power transmission member 35, or the electric motor 21. The rotary shaft 22 may be detachably attached. If it does so, since it will suffice to wash after removing a filter and making it easy to wash, maintenance nature improves.

  In addition, the filter may be attached directly to the impeller to the impeller as a separate body from the power transmission member instead of the power transmission member (third embodiment described later). However, when the filter 33 is provided on the power transmission member 35, the filter 33 is attached to the power transmission member 35 which is an essential component, thereby improving the oil collection efficiency without degrading the performance as the blower fan 30. Moreover, since the number of members is reduced, it contributes to cost reduction. When the filter is mounted separately from the power transmission member, the filter is preferably provided in the entire radial region inside the impeller, that is, over the entire inner diameter of the impeller. According to this, almost all the air flowing through the inside of the impeller sucked from the suction port passes through the hole of the filter, and the collection efficiency of oil in the air can be improved. In the case of the present embodiment, the filter 33 is integrated with the hub portion and the peripheral portion of the power transmission member 35, and the filter 33 substantially includes the entire inner diameter of the impeller 32 including a portion having no hole. It can be said that it is provided over the entire area. Further, the filter may be directly attached to a shaft that is a rotating shaft of an electric motor that rotates a blower fan, instead of being attached to a power transmission member or an impeller. In this case, the center portion C of the filter may be attached to the shaft, and the periphery P of the filter may or may not be attached to the blade or the power transmission member.

  Further, the filter 33 has a truncated cone shape in plan view. In plan view, the center portion C of the filter 33 corresponds to the upper bottom of the truncated cone, and the periphery P of the filter 33 corresponds to the lower bottom of the truncated cone. When the filter 33 is attached to the blower fan 30, the position of the periphery P of the filter 33 in the rotation axis direction is different from the position in the rotation axis direction of the center portion C of the filter 33, and the rotation axis direction of the center portion C Is a position farther from the suction port 37 than the position of the surrounding P in the direction of the rotation axis, in other words, is downstream of the air flow. By doing in this way, in the impeller which has the same internal diameter, since the area of a filter becomes large, ventilation resistance can be made small and an air volume can be enlarged. When the filter is attached to the rotating shaft of the electric motor, the position in the rotating shaft direction where the filter is attached to the rotating shaft is different from the position in the rotating shaft direction around the filter, and the position in the surrounding rotating shaft direction is The position closer to the upstream side air flow inlet than the position in the direction of the rotational axis where the filter is attached to the rotational axis, in other words, the upstream side of the air flow.

  The hole 34 of the filter 33 has a slit shape. As a result, when the hole has an aspect ratio close to 1, when cleaning with a cleaning tool such as a brush, the hair of the brush may enter the hole and get caught. There are few, and cleaning property can be improved.

  The major axis direction of the slit-shaped hole 34 includes a component in the radial direction of the filter 33. That is, all the holes 34 in the filter 33 do not include a component in the radial direction and do not include only a circumferential direction (tangential direction). All the holes are formed so as to go from the central portion C of the filter 33 toward the periphery P. When the major axis direction of the slit-shaped hole 34 is the circumferential direction (tangential direction), the oil collecting rate is lowered, and a high oil collecting rate can be ensured. 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.

  In addition, the slit-shaped hole 34 is formed by a curve that is convexly convex toward the outer peripheral side of the filter 33 and contains more components in the circumferential direction as it approaches the periphery P. 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 a slit is a straight line, an aperture ratio can be made high and, as a result, ventilation resistance can be restrained low. In addition, even when the aperture ratio is increased, it is possible to ensure the strength for rotating the filter.

  FIGS. 13 and 14 illustrate the action of collecting oil by rotating with the air flow A in the blower fan 30. Before describing the operation, the power transmission member 35 is attached to the impeller 32 when the periphery of the filter 33 is attached to the impeller 32 and the position in the rotation axis direction and the periphery of the filter 33 is attached to the power transmission member 35. The position in the rotation axis direction will be described. The hub portion and the peripheral portion of the power transmission member 35 and the filter 33 integrated therewith are provided substantially over the entire inner diameter R of the impeller 32.

  The position at which the peripheral portion of the power transmission member 35 is attached to the blade 31 is, when the length in the rotation axis direction of the impeller 32 is L, in the present embodiment, a distance of about L / 4 from the suction port 37, that is, the back side. , Downstream of the air flow A. Of course, the present invention is not limited to this, and when the periphery P of the filter 33 is attached to the power transmission member 35, the position in the rotational axis direction where the power transmission member 35 is attached to the impeller 32 is the upstream suction port 37 of the air flow A. Between the position of the suction port 37 and the position of the suction port 37 may be a position downstream of one half of the length in the rotation axis direction. The same applies to the position where the periphery P of the filter 33 is attached to the blade 31 when the periphery P of the filter 33 is directly attached to the impeller 32. In addition, attaching to the position of the suction inlet 37 includes attaching to the ring-shaped member of the impeller 32 which connects the some blade | wing 31 respectively.

  When the blower fan 30 starts to rotate, the air flow A including the oil smoke that has passed through the introduction unit 7 is sucked from the right to the left in the drawing. The impeller 32 of the blower fan 30 is rotated by the electric motor 21, sucks air from the suction port 37, and discharges it to the outside of the blade 31. When discharging to the outside of the blade 31, there are two routes. Before and after the position around the filter 33 attached to the impeller 32 in the direction of the rotation axis, the route (O1) is discharged directly from the suction port 37 through the gap between the blades 31 and from the suction port 37. There is a route (O 2) that passes through the hole 34 of the filter 33 and then passes through the gap between the blades 31 and is discharged to the outside.

  In the case of the O1 route, since the air is going to be discharged from the blower fan 30 without passing through the filter 33, the air containing the same amount of oil as the oil that has flowed through the introduction portion 7 passes through the gap between the rotating blades 31. Will pass. If it does so, the oil component contained in the air will collide with the blade | wing 31 of the blade | wing 31 of that part (length part of L / 4 from the suction inlet 37), and as a result, an oil component will adhere.

  On the other hand, in the case of the O2 route, since the air is discharged from the blower fan 30 through the filter 33, the air from which most of the oil has been removed by the filter 33 passes through the gap between the rotating blades 31. As a result, the oil component hardly collides with the blades 31 in the blades 31 on the rear side (downstream of the air flow) from the position in the rotation axis direction where the periphery of the filter 33 is attached to the impeller 32. No oil adheres to the blades 31 and can maintain a clean state.

  The oil component contained in the oil smoke has a large particle size and a small particle size. However, since the oil component with a large particle size cannot be suddenly changed in direction, the suction port 37 (suction port 37) close to the blade 31 is temporarily assumed. Even if it is sucked from the peripheral edge of the filter, it often passes through the O2 route and is collected by colliding with the filter 33. On the other hand, although the oil content with a small particle diameter cannot be changed greatly although it is small, the oil sucked from the central portion of the suction port 37 passes through the O2 route. Accordingly, what passes through the O1 route is considered to be limited to the oil component having a small particle diameter and sucked from the peripheral portion of the suction port 37, and therefore the rotation shaft around which the filter 33 is attached to the impeller 32. Oil does not adhere to the blade 31 on the near side (upstream side of the air flow) from the position in the direction.

  The rotation speed per unit time of the filter 33 rotating together with the impeller 32, that is, the rotation speed of the electric motor 21, may be at least 230 rpm (Rotation Per Minute) or more, depending on the opening state of the hole 34 of the filter 33. . When the filter 33 rotates at a relatively high speed, the surface of the filter 33 (the portion without the hole 34) drags the air in contact with the surface by a frictional force, and the movement is transmitted to the nearby air due to the viscosity of the air. Air movement occurs near the surface of the filter 33, and the filter 33 is rotating, so the air movement is a vortex around the rotation axis.

  This spiral air movement occurs on both surfaces of the filter 33, that is, on both the lower surface and the upper surface of the filter 33, in other words, on both the upstream surface and the downstream surface of the air flow A of the filter 33. In the present embodiment, the air flow A generated by the impeller 32 flows from the right to the left in the drawing through the hole 34 of the filter 33, and therefore, on the downstream side of the filter 33, While the movement is separated from the surface of the filter 33, a spiral flow toward the outer peripheral edge of the filter 33 is generated. On the other hand, on the upstream side of the filter 33, the movement of the vortex air is pressed against the surface of the filter 33, and a high-density air layer with a vortex flow toward the outer peripheral edge of the filter 33 is formed.

  FIG. 14 shows the effect of the air flow in the filter 33. The oil component OP1 generated by cooking or the like flows along with the air flow A and reaches the vicinity of the upstream surface of the filter 33. 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 33 (the portion without the hole 34), the filter 33 is blown off in the direction of the outer peripheral edge which is the periphery P of the filter 33. As a result, oil content OP3 is collected on the inner surface of the fan casing 23 provided so as to surround the outer peripheral edge of the filter 33, and the lowermost inner surface of the fan casing 23 becomes the oil reservoir 28, where it is recovered as oil OL. Oil that has become very fine particles passes through the holes 34 of the filter 33 together with the air flow A.

  In this way, part of the oil that could not be collected adheres to the fan casing 23, the exhaust duct D, and the like located downstream from this, but the periphery of the filter 33 and the like in the direction of the rotation axis attached to the impeller 32 Most of the oil that has become fine enough to pass through the gaps between the blades 31 on the front side of the position and the hole 34 of the filter 33 is directly discharged on the air flow A through the exhaust duct D to the outside. The Therefore, the range hood 1 of the present embodiment according to the present invention does not substantially adhere oil to the downstream portion of the air flow path from the filter 33, and cleans / washes the fan casing 23, the exhaust duct D, etc. downstream of the filter 33. Can be greatly reduced.

  In addition, due to such an action, when the position where the filter 33 or the like is attached is the position of the suction port 37, it is possible to reduce the adhesion of oil over the entire area of the blade 31 of the impeller 32, and the position where the filter 33 or the like is attached. When it is the central position in the axial direction of the blade 31 (the position on the back side of about L / 2), it is possible to secure a sufficient air volume without increasing the airflow resistance and reduce the adhesion of oil over half of the blade 31; When the position where the filter 33 or the like is attached is between the center position of the blade 31 and the suction port 37, it is possible to secure an appropriate amount of air and to reduce oil from adhering to the blade on the downstream side of the attachment position.

  With the above-described configuration and action, while improving the collection efficiency of oil in the air while ensuring a sufficient air volume, reducing oil from adhering to the impeller, and attaching oil to the filter intensively, It is possible to provide a blower fan that improves the facilities in the air flow path downstream from the impeller and the maintainability of the impeller itself.

  Such a range hood 1 uses a conventional slot filter or the like, and is high in a state where pressure loss is small as compared to improving the oil collecting efficiency by making slits and eyes fine or overlapping to form a multilayer. It can have oil collection efficiency. That is, using a conventional slot filter or the like, if the oil collection efficiency is improved by making the slits finer or overlapping and multilayering, the ventilation part of the filter forms a complicated flow path, Although the ventilation resistance tends to be high, in the case of the range hood 1, oil collection efficiency is increased by rotation of the filter, and thus it is not necessary to form such a complicated flow path. Therefore, it is possible to obtain a high oil collection efficiency while maintaining a low ventilation resistance as compared with the conventional filter.

<Second embodiment>
With reference to FIG. 15 thru | or FIG. 16, the air blower fan 30A in a present Example is demonstrated. In order to avoid repeated description, differences from the above embodiment will be mainly described. The blower fan 30A includes an impeller 32A, a power transmission member 35A that transmits a rotational force to the impeller 32A, and a filter 33A that has a slit-shaped hole 34A that allows a flow of air generated by the rotation of the impeller 32A to pass therethrough. Is the same as the first embodiment.

  The difference from the first embodiment is the shape of the filter 33A. The filter 33 of the first embodiment has a truncated cone shape, but the filter 33A of the present embodiment has a flat plate shape. That is, the position in the rotation axis direction where the periphery of the filter 33A is attached to the impeller 32A is substantially the same as the position in the rotation axis direction of the center portion (rotation shaft portion 36A) of the filter 33A, and the filter surface of the filter 33A is It is almost perpendicular to the rotation axis of the impeller 32A. According to this, a simple filter can be attached with a simple structure. When the power transmission member is attached to the impeller, the position in the rotation axis direction where the power transmission member is attached to the impeller is substantially the same as the position in the rotation axis direction of the central portion of the filter. When the filter is attached to the rotating shaft of the electric motor, the position in the rotating shaft direction where the filter is attached to the rotating shaft of the electric motor is substantially the same as the position in the rotating shaft direction on the outer periphery of the filter.

  The position in the rotation axis direction where the periphery of the filter 33A is attached to the impeller 32A is substantially the same as the position in the rotation axis direction of the center portion (rotation shaft portion 36A) of the filter 33A, as in the above embodiment. For example, the filter surface of the filter 33A may be formed in a wavy surface to increase the area, and may not be perpendicular to the rotation axis of the impeller 32A.

  Further, the difference from the first embodiment is how to attach the filter 33A and the blade 31A. In the first embodiment, the periphery of the filter 33 is attached to the power transmission member 35. In the present embodiment, the periphery of the filter 33A is directly attached to the impeller 32A.

  Further, the difference from the first embodiment is the relationship between the filter 33A and the power transmission member 35A. In the first embodiment, the filter 33 is provided on the power transmission member 35. In the present embodiment, the filter 33A and the power transmission member 35A are integrally formed. That is, in the first embodiment, five filters 33A are attached to the hub portion, the peripheral portion, and the spoke portions (five pieces) of the power transmission member 35. In this embodiment, the region where the holes 34A are present. Functions as the filter 33, and a portion attached to the blade 31 in the region without the hole 34A corresponds to the peripheral portion, and a region in the radial direction without the hole 34A corresponds to the spoke portion (four).

<Third embodiment>
With reference to FIG. 17 thru | or FIG. 18, the air blower fan 30B in a present Example is demonstrated. In order to avoid repeated description, differences from the above embodiment will be mainly described. The blower fan 30B is a filter 33B having an impeller 32B, a power transmission member 35B that transmits a rotational force to the impeller 32B, and a slit-shaped hole 34B that allows a flow of air generated by the rotation of the impeller 32B to pass therethrough. It is the same as the said Example by the point provided with these.

  The difference from the above embodiment is the relationship between the filter 33B and the power transmission member 35B. In the above embodiment, the filter is provided integrally with the power transmission member. However, in this embodiment, the flat plate-shaped filter 33B is not provided on the power transmission member 35B. As a separate body, the periphery P is directly attached to the impeller. That is, the periphery of the power transmission member 35B is attached to the center of the blade 31B in the rotation axis direction, and the filter 33B is attached to the vicinity of the suction portion 37B of the blade 31B. According to this, the power transmission member 35B can efficiently transmit power to the impeller 32B and can reduce the adhesion of oil over the entire area of the blade 31B. In this embodiment, the power transmission member 35B is attached around the center of the blade 31 in the direction of the rotation axis. However, if the power transmission member 35B is located on the downstream side of the air flow from the filter 33B. It may be attached to the front or back rather than the approximate center in the direction of rotation.

  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, although the present invention has been particularly illustrated and described with respect to particular embodiments, it should be understood that the present invention has been described in terms of quantity, quantity, and amount without departing from the scope and spirit of the present invention. In other detailed configurations, various modifications can be made by those skilled in the art.

DESCRIPTION OF SYMBOLS 1 Range hood 2 Hood part 3 Blower box 4 Inner panel 5 Rectifier 6 Communication port 7 Introduction part 20 Blower 21 Electric motor 22 Motor rotating shaft 23 Fan casing 24 Fan casing inlet 25 Bell mouth 26 Fan casing washing liquid outlet 27 Fan casing Exhaust port 28 Oil reservoir 30 Blower fan 31 Blade 32 Impeller 33 Filter 34 Hole (slit)
35 Power transmission member 36 Rotating shaft 37 Suction port 40 Cleaning mechanism 41 Tank 42 Tank lid 43 Tank storage part 44 Tank storage part cover 45 Cleaning liquid suction port 46 Nozzle 47 Cleaning liquid discharge port 48 Oil component adsorbing member 49 Cleaning liquid piping D Exhaust duct A Air Flow R Inner Diameter P Perimeter C Center Part L Length of Impeller Rotation Axial Direction OP Oil Content OL Oil

Claims (15)

An impeller having a plurality of blades arranged in a cylindrical shape ;
A power transmission member that transmits rotational force to the impeller;
A filter attached to a rotating shaft of the impeller, the power transmission member, or the electric motor generating the rotational force, and having a hole through which an air flow generated by the rotation of the impeller passes;
A blower fan comprising:
A route in which the air flow sucked from the suction port of the impeller having a plurality of blades arranged in the cylindrical shape is directly discharged to the outside through the gap between the blades from the suction port without passing through the filter. A blower fan provided with two routes: a route through which the air flow is discharged from the suction port through a hole in the filter and then through a gap between the blades to the outside . When the filter is attached to the power transmission member, the position in the rotational axis direction where the power transmission member is attached to the impeller is the position of the upstream side of the air flow and the position of the suction port in the direction of the rotational axis. Between one half of the length and the downstream position, and
In the case where the periphery of the filter is directly attached to the impeller, the position in the rotation axis direction where the periphery of the filter is attached to the blade is the direction of the rotation axis from the position of the upstream suction port of the air flow and the position of the suction port. The blower fan according to claim 1, wherein the blower fan is located between a position downstream of one-half of the length of the fan.   The blower fan according to claim 1 or 2, wherein the filter is provided over the entire inner diameter of the impeller.   The blower fan according to any one of claims 1 to 3, wherein the filter is detachably attached to the impeller, the power transmission member, or a rotating shaft of an electric motor.   The blower fan according to any one of claims 1 to 4, wherein the hole has a slit shape, and a major axis direction of the slit includes a component in a radial direction of the filter.   6. The blower according to claim 5, wherein the long side of the slit is a curve convex toward the outer periphery of the filter, and the curve includes more components in a circumferential direction as it approaches the outer periphery of the filter. fan.   The position in the rotation axis direction where the filter or the power transmission member is attached to the impeller is substantially the same as the position in the rotation axis direction of the central portion of the filter, or the rotation where the filter is attached to the rotation shaft of the electric motor. 7. The blower fan according to claim 1, wherein the position in the axial direction is substantially the same as the position in the rotation axis direction on the outer periphery of the filter. The blower fan according to any one of claims 1 to 6, wherein a filter surface of the filter is substantially perpendicular to a rotation axis of the impeller. Before SL filter provided over the side of the rotary shaft from the blade side, the position of the blade side of the filter, any of claims 1 to 6, characterized in that close to the upstream inlet than the position of the rotary shaft side of the filter Blower fan according to crab.   10. A blower comprising a motor having a rotating shaft attached to the center of the power transmission member of the blower fan according to claim 1, wherein the motor rotates the blower fan. A range hood that collects oil smoke generated by cooking,
The blower according to claim 10,
A blower box that houses the blower;
Range hood equipped with. A tank for storing cleaning liquid;
A nozzle for directly injecting the cleaning liquid from the tank to the filter surface on the upstream side of the air flow of the filter of the blower fan;
A discharge port for the cleaning liquid at the bottom of the fan casing that houses the blower,
The range hood according to claim 11, further comprising: It further includes a replaceable oil adsorbing member that adsorbs oil contained in the cleaning liquid,
The range hood according to claim 12, wherein the tank collects the cleaning liquid flowing out from the discharge port through the oil adsorbing member.   The range hood according to claim 13, wherein the oil adsorbing member is provided in the tank.   The nozzle is ejected in a linear shape, a curved shape, a plurality of linear shapes, a plurality of curved shapes, or a combination thereof over a region crossing a range connecting the minimum radius position and the maximum radius position of the filter. The range hood according to any one of claims 12 to 14.