JP2017125623A - Range food - Google Patents

Abstract

An object of the present invention is to enable the entire impeller including a main plate to be cleaned, to shorten the cleaning time and to maintain the aesthetic appearance of the impeller after cleaning. In contrast to a range hood that stores a cleaning liquid 51 in a cleaning casing 50 to clean the impeller 10, the impeller 10 has a squirrel-cylinder shape, and the side plate 16 is inserted into the cylinder of the impeller 10 from the side plate 16 side. A hollow rod-shaped watering nozzle 54 extending toward the main plate 17 side is installed, and watering holes are provided in the watering nozzle 54 so that the washing water can flow in the direction opposite to the rotation direction of the impeller 10. The dirt on the impeller 10 is peeled off using the force of the washing water and the centrifugal force of the impeller. [Selection] Figure 1

Description

  The present invention relates to removal of dirt from an oil collecting mechanism attached to a range hood.

  Conventionally, as shown in FIG. 8, this type of range hood is provided with a suction port 101 for collecting oil smoke generated from the cooking utensil, dust floating around the cooking utensil (not shown), and the like. A hood 102 is installed on a wall surface 103. The hood 102 is provided with a discharge port 105 on the top surface communicating with the outdoors via a duct 104, and an electric motor 107 having a rotating shaft 106 disposed substantially horizontally therein. An impeller 108 attached to the rotating shaft 106 and a cleaning casing 109 including the impeller 108 are disposed, and a ventilation path 110 connecting the suction port 101 and the discharge port 105 through the impeller 108 is formed. A box-shaped rectifying plate 111 is disposed near the suction port 101 of the hood 102.

  Below the cleaning casing 109, a water storage device 113 for storing the cleaning liquid 112 and a water supply pump 114 are provided. The cleaning casing 109 is provided with a water spray nozzle 115 connected from the water supply pump 114. A hole 116 is provided in the lower end portion of the cleaning casing 109, an opening / closing valve 117 for storing and discharging the cleaning liquid 112 is provided in the cleaning casing 109, and a drain tray 118 is formed below the opening / closing valve 117.

  As shown in FIG. 9, the impeller 108 of the centrifugal fan includes a plurality of blades 120 erected on the main plate 119, and a ring-shaped oil collecting mechanism 121 is provided inside the impeller 108 from the blades 120 to 15. A plurality of sheets are attached at a distance of about [mm] and spaced in the direction of the rotating shaft 106.

  Hereinafter, the range hood will be described with reference to FIG.

  At the time of cleaning, a portion below the rotating shaft 106 of the impeller 108 is immersed in the cleaning liquid 112 supplied from the water storage device 113 in the cleaning casing 109. The impeller 108 and the oil collecting mechanism 121 are contaminated with the use of the range hood. By rotating the impeller 108 with the rotating shaft 106, the part to which dirt has adhered can be cleaned by immersing it in the cleaning liquid 112 (see, for example, Patent Document 1).

JP 2014-062710 A

  In such a conventional range hood, it has been difficult to clean up to the main plate portion of the impeller. Further, there has been a demand for a cleaning mechanism that further enhances the cleaning power of the oil collecting mechanism portion and blade of the impeller involved in oil smoke collection, shortens the cleaning time, and realizes water saving.

  The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a range hood capable of cleaning the main plate portion of the impeller and further improving the cleaning effect of the blade of the impeller and the oil collecting mechanism. It is said.

  In order to achieve the above object, the present invention provides an impeller rotated by an electric motor, an oil collecting mechanism part integrally provided in the impeller, and a cleaning casing for immersing the oil collecting mechanism part in a cleaning liquid, A range for cleaning the impeller and the oil collecting mechanism by providing the cleaning casing with an on-off valve for storing and discharging the cleaning liquid, closing the on-off valve to store the cleaning liquid, and spraying the cleaning liquid onto the impeller In the hood, the impeller has a squirrel-cylinder shape including at least a plurality of blades, an annular side plate, and a circular main plate, and the side of the impeller from the side plate side to the main plate side faces the impeller. A hollow rod-shaped watering nozzle extending toward the surface is installed, and at least the blade, the oil collecting mechanism, and the main plate are provided in the watering nozzle so that the cleaning liquid can be landed in the direction opposite to the rotation direction of the impeller. Towards It is obtained by the as a water possible water spray holes, thereby is to achieve the intended purpose.

  According to the present invention, an impeller that is rotated by an electric motor, an oil collecting mechanism unit that is provided integrally with the impeller, a cleaning casing for immersing the oil collecting mechanism unit in a cleaning liquid, and the cleaning casing, In the range hood provided with an on-off valve for storing and discharging the cleaning liquid, closing the on-off valve to store the cleaning liquid, and spraying the cleaning liquid onto the impeller to clean the impeller and the oil collecting mechanism. Is a cage-shaped cylindrical shape including at least a plurality of blades, an annular side plate, and a circular main plate, and is a hollow rod shape extending from the side plate side toward the main plate side toward the impeller in the cylinder of the impeller A water spray nozzle is installed, and the water spray nozzle can spray water toward at least the blade, the oil collecting mechanism, and the main plate so that the cleaning liquid can land in the direction opposite to the rotation direction of the impeller. Equipped with holes And it is, the main plate portion of the impeller can also be easily washed, can further improve the cleaning effect of the blade and oil collection mechanism section of the impeller.

Side surface cross-section block diagram which shows the range hood of Embodiment 1 of this invention Front cross-sectional configuration diagram showing the same range hood Configuration perspective view of impeller of same range hood Casing configuration diagram of the same range hood Perspective view showing the watering nozzle of the same range hood Sectional view seen from the vertical direction of the rotation axis showing the characteristics of the same range hood Sectional drawing (the figure seen from A-A ') which shows the position and spray angle of the watering nozzle arranged in the same range hood Side cross-sectional configuration diagram showing a conventional range hood The figure which shows the structure of the impeller and oil collection mechanism part of the same range hood Front cross-sectional configuration diagram showing the same range hood

  The range hood according to claim 1 of the present invention includes an impeller that is rotated by an electric motor, an oil collecting mechanism portion that is provided integrally with the impeller, and a cleaning casing that immerses the oil collecting mechanism portion in a cleaning liquid. A range for cleaning the impeller and the oil collecting mechanism by providing the cleaning casing with an on-off valve for storing and discharging the cleaning liquid, closing the on-off valve to store the cleaning liquid, and spraying the cleaning liquid onto the impeller In the hood, the impeller has a squirrel-cylinder shape including at least a plurality of blades, an annular side plate, and a circular main plate, and the side of the impeller from the side plate side to the main plate side faces the impeller. A hollow rod-shaped watering nozzle extending toward the surface is installed, and at least the blade, the oil collecting mechanism, and the main plate are provided in the watering nozzle so that the cleaning liquid can be landed in the direction opposite to the rotation direction of the impeller. For In which is provided with a watering can nozzle holes.

  Thus, when cleaning the impeller with dirt attached thereto, when the cleaning liquid is sprayed from the watering nozzle while rotating the impeller, the sprayed cleaning liquid includes the blades and the oil collecting mechanism portion that constitute the impeller. And it lands near the rotation axis of the main plate. When the water has landed, the dirt is peeled off by the spraying pressure of the cleaning liquid from the watering nozzle. Since the spraying direction of the cleaning liquid is opposite to the rotation direction of the impeller, the collision energy of the cleaning liquid with the dirt on the impeller is increased, and the dirt is easily removed. The washing water sprayed toward the blade and the oil collecting mechanism part falls to the washing casing while peeling off the dirt attached to the oil collecting mechanism part and the blade provided integrally with the impeller. On the other hand, the washing water sprayed toward the main plate moves to the outer peripheral side of the main plate while removing the dirt on the main plate by the centrifugal force generated by the rotation of the impeller, and from the outer periphery of the main plate to the cleaning casing. And fall. Since the main plate is rotating, water can be landed on the entire inner periphery of the main plate even if the watering nozzle and the jetting direction are fixed. Finally, all the cleaning liquid is stored in the cleaning casing.

  By rotating the impeller while the cleaning liquid is stored in the cleaning casing, in addition to the main plate, the blade of the impeller and the oil collecting mechanism are immersed and contacted with the cleaning liquid to clean the oil stains. can do.

  Therefore, the entire impeller including the main plate including the main plate, which is difficult to clean because the cleaning liquid does not spread and become wet simply by rotating the impeller in the stored cleaning casing with respect to the impeller accumulated with dirt. This makes it possible to clean, and not only prevents clogging but also keeps the aesthetic appearance clean. Moreover, in addition to the cleaning action by the rotation of the impeller, the action of peeling off the dirt by the water flow sprayed from the watering nozzle works, so that a further cleaning effect of the dirt attached to the oil collecting mechanism and the blade is exhibited. Can do.

  Further, since the watering nozzle is provided with watering holes only toward the blade side and the main plate side where oil droplets contained in the airflow sucked into the range hood do not easily collide, the watering holes of the watering nozzle are not provided. The effect is that it is difficult to get dirty.

  Further, in the range hood according to claim 2, the watering nozzle extends into the cylinder of the impeller above the rotation shaft of the impeller, and is a watering hole capable of watering toward the main plate at the lowermost end. It is characterized by comprising.

  Thereby, when the water supply pump is stopped, the remaining water is drained from the lowermost end portion of the watering nozzle. As a result, there is no residual water remaining in the hollow bar-shaped watering nozzle, and it is possible to prevent the watering holes from being blocked by the precipitation of scale.

  Moreover, the range hood of Claim 3 is equipped with the heater which raises the temperature of a washing | cleaning liquid upstream the injection nozzle of the said watering nozzle.

  Thereby, the washing | cleaning liquid to inject can be injected as high temperature water or a heating steam. Therefore, there is an effect that the temperature of the attached oil is raised to promote softening and the cleaning effect can be enhanced. In addition, the temperature inside the range hood can be raised to prevent the generation of mold and bacteria.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 and 2, in the first embodiment, the range hood 1 has a main body 2 installed on a wall surface 3 and a duct 5 connected to a discharge port 4 to communicate with the outdoors.

  The main body 2 is a box provided with a hood portion 6 so as to collect oil smoke generated from the cooking utensil or dust floating around the cooking utensil (not shown). 7 is provided with a suction port 8, and the top surface 9 is provided with the discharge port 4.

  Inside the main body 2, a blower 11 provided with a cage-type cylindrical impeller 10 and a cleaning device 12 for cleaning the impeller 10 are provided.

  The blower 11 is a sirocco fan including a motor 13 that rotates the impeller 10 and a casing 14 that surrounds the impeller 10 in addition to the impeller 10.

  As shown in FIG. 3, the impeller 10 includes at least a plurality of blades 15, an annular side plate 16, and a circular main plate 17. The blade 15 is disposed so that both end portions are sandwiched between the side plate 16 located on the blower inlet 18 side of the blower 11 and the main plate 17 located on the motor 13 side. That is, the impeller 10 has a cage-type cylindrical shape including a plurality of blades 15, an annular side plate 16, and a circular main plate 17.

  Further, the main plate 17 includes a conical surface 29 that protrudes toward the side plate 16 in the axial direction with respect to the outer periphery. In other words, the impeller 10 also has a conical surface 29 that is inclined so as to rise from the outer peripheral direction of the circle toward the rotation shaft 21 that is the central axis. Note that the circular main plate 17 may be a flat surface, or may be partially provided with unevenness. Further, a plurality of ring-shaped oil collecting mechanism portions 30 are attached to the inner peripheral portion of the impeller 10 at a certain distance from each other.

  The casing 14 shown in FIG. 4 is provided with the blower inlet 18 and the blower outlet 31.

  The casing 14 includes a scroll plate 32, a casing front plate 33, a casing back plate 34, a tongue portion 35, and an extension plate 36 provided on the extension of the scroll plate 32. An extension plate 37 provided on the extension of the tongue 35 is provided. In the casing 14, the extension plate 36 and the extension plate 37 are not essential.

  The casing front plate 33 and the casing back plate 34 are flat plates arranged with a gap corresponding to the height direction of the impeller 10.

  The scroll plate 32 is a curved plate that expands the air path toward the rotation direction of the impeller 10 around the tongue 35 on the outer periphery of the impeller 10. The extended plate 36 is a flat plate in which the scroll plate 32 is further extended to the blower outlet 31. The extension plate 37 is a flat plate extending from the tongue 35 to the blower outlet 31 from the counter-rotating direction side.

  Further, the scroll plate 32 is disposed over the main part of the side surface portion 38 of the casing 14. The side surface portion 38 of the casing 14 occupies a range of about 300 degrees from the tongue portion 35 in the rotation direction of the impeller 10.

  The blower outlet 31 is formed in the side surface portion 38 of the casing 14 so as to be surrounded by the end portions of the casing front plate 33, the casing back plate 34, the extension plate 36, and the extension plate 37. When the extension plate 36 and the extension plate 37 are not provided, the casing front plate 33, the casing rear plate 34, the scroll plate 32, and the tongue 35 may be surrounded by the end portions.

  Further, the casing 14 includes an orifice 39 at a substantially central portion of the casing front plate 33. In the upper left part of the orifice 39, a hollow bar-shaped watering nozzle 54 extending from the side plate 16 side of the impeller 10 toward the main plate 17 side is installed in the cage cylinder of the impeller 10 from the orifice 39. The water spray nozzle 54 has at least the blade 15, the oil collecting mechanism 30, and water spray holes capable of water spraying toward the main plate 17 so that the cleaning water can flow toward the upstream surface in the rotational direction of the impeller 10. Yes.

  The blower inlet 18 is in the inner periphery of the orifice 39. In FIG. 1, the motor 13 is disposed on the casing back plate 34 side. The impeller 10 is rotated from the motor 13 through the shaft 40.

  The casing 14 is arranged so that the casing front plate 33 and the casing rear plate 34 stand up inside the main body 2. That is, the impeller 10 is disposed with the rotation shaft 21 sideways, and the blower outlet 31 is disposed upward.

  The blower outlet 31 is connected to the outlet 4 of the main body 2. The blower inlet 18 opens inside the main body 2 and communicates with the suction port 8.

  The motor 13 includes a rotation speed sensor (not shown) and a current sensor (not shown), and detects the rotation speed and current value of the motor. This is because a Hall IC is preferable as the rotation speed sensor, and the cost is low and the accuracy is good.

  As shown in FIG. 1, the cleaning device 12 includes a cleaning casing 50 that is also the casing 14 of the blower 11, a water storage device 52 that stores the cleaning liquid 51, a water supply pump 53, a watering nozzle 54, and a drain tray 55. .

  The cleaning casing 50 is a machine body that can store the cleaning liquid 51 when cleaning the blade 15 and the oil collecting mechanism 30, and is provided with a hole 56 at the lower end, and the cleaning liquid is contained in the cleaning casing 50 in the hole 56. An opening / closing valve 57 for storing and discharging 51 is provided, and a drain tray 55 is disposed below the opening / closing valve 57. The storage amount of the cleaning liquid 51 as the cleaning casing 50 may be as long as the blade 15 and part of the oil collecting mechanism 30 are immersed.

  The water storage device 52 is provided below the cleaning casing 50.

  The water supply pump 53 supplies the cleaning liquid 51 stored in the water storage device 52 to the watering nozzle 54 and is provided inside the main body 2.

The watering nozzle 54 has a hollow bar-like watering nozzle 54 extending from the side plate 16 side toward the main plate 17 side toward the impeller 10 in the cylinder of the impeller 10 above the rotation shaft 21 of the impeller 10. is set up.
The water spray nozzle 54 shown in FIG. 5 is attached to the blade 15, the oil collecting mechanism 30, and the main plate 17 that constitute the impeller 10 so that the washing water can flow in the direction opposite to the rotation direction of the impeller 10. A water spray hole 58 capable of spraying water is provided. At the lowermost end 59 of the watering nozzle, a watering hole 58 capable of watering toward the main plate 17 is provided.

  FIG. 6 is a perspective view of the casing front plate 33 from a vertical plane of the rotating shaft 21 (a surface that makes the rotating shaft 21 round). The cleaning liquid 51 ejected from the watering nozzle 54 can be landed in the direction opposite to the rotation direction of the impeller 10. The arrows in the figure indicate the direction of the cleaning water sprayed from the water spray nozzle 54.

  FIG. 7 shows the position of the watering nozzle 54 when viewed from the same plane as the rotary shaft 21 in the A-A ′ cross section of FIG. 6. The cleaning liquid 51 ejected from the watering nozzle 54 is intended to land on the main plate 17 while drawing a locus of arrows.

  In the above configuration, when the motor 13 (preferably a DC motor) is operated when oily smoke is generated during cooking, the impeller 10 rotates, and air containing oily smoke or dust is sucked from the suction port 8 and the main body. 2, after passing through the impeller 10, oil and dust collide with the ring-shaped oil collecting mechanism 30 and are collected. The air is discharged to the outside through the duct 5 through the discharge port 4.

  If this is repeated, oil and dust accumulate in the oil collecting mechanism 30, the blade 15 of the impeller 10, the oil collecting mechanism 30, and the main plate 17, causing clogging and reducing the amount of exhaust air. Or the aesthetics will be impaired. Therefore, in order to prevent a reduction in the amount of exhaust air, the oil collecting mechanism 30 and the blade 15 of the impeller 10 are cleaned.

  First, the motor 13 is stopped, the on-off valve 57 is closed, and the cleaning liquid 51 stored in the water storage device 52 is pumped up by the water supply pump 53 and supplied to the watering nozzle 54. The cleaning liquid 51 in the water storage device 52 is supplied in advance.

  Thereafter, when the cleaning liquid 51 is sprayed from the watering nozzle 54 while rotating the motor 13, the sprayed cleaning liquid 51 arrives near the rotating shaft 21 of the blade 15 and the oil collecting mechanism 30 and the main plate 17 constituting the impeller 10. Water. When the water has landed, the dirt is peeled off by the spraying pressure of the cleaning liquid 51 from the watering nozzle 54. Since the spraying direction of the cleaning liquid 51 is opposite to the rotation direction of the impeller 10, the collision energy of the cleaning liquid with the dirt on the impeller 10 is increased, and the dirt is easily removed.

  The washing water sprayed toward the blade 15 and the oil collecting mechanism portion 30 is supplied to the washing casing 50 while removing the dirt attached to the oil collecting mechanism portion 30 and the blade 15 provided integrally with the impeller 10. And fall.

  On the other hand, the cleaning water sprayed from the watering nozzle 54 toward the main plate 17 lands near the rotating shaft 21 of the main plate 17. When the water has landed, the dirt is peeled off by the spraying pressure of the cleaning liquid 51 from the watering nozzle 54. At this time, since the spraying direction of the cleaning liquid 51 from the water spray nozzle 54 is opposite to the rotation direction of the impeller 10, the collision energy of the cleaning liquid 51 with the dirt on the impeller 10 becomes high, and the dirt is easily removed. effective. Since the main plate 17 is rotating, even if the watering nozzle 54 and the jetting direction are fixed, water can be landed on the entire inner periphery of the main plate 17. Further, the cleaning liquid 51 that has landed moves to the outer peripheral side while removing the dirt on the main plate 17 by centrifugal force due to the inclination of the main plate 17 and the rotation of the impeller 10, and falls from the outer periphery of the main plate 17 to the cleaning casing 50. . As a result, the cleaning liquid 51 is stored in the cleaning casing 50. In addition, by rotating the motor 13 with the cleaning liquid 51 stored in the cleaning casing 50, the entire circumference of the oil collecting mechanism 30 and the blade 15 of the impeller 10 are immersed in the cleaning liquid 51 and cleaned. The drainage and drying are performed by opening the on-off valve 57 and moving the cleaning liquid 51 to the drainage tray 55 and blowing it to blow.

As described above, in addition to the oil collecting mechanism 30 and the blade 15 of the impeller 10 in which dirt is accumulated by a series of cleaning steps, the blade including the main plate 17 that is difficult to clean because the cleaning liquid 51 is not wet and spread only by the rotation of the impeller 10. The entire vehicle 10 can be cleaned, and not only can clogging be prevented, but also the beauty can be kept clean. In addition, the spraying force of the cleaning liquid 51 from the watering nozzle 54 can further enhance the cleaning power in the collection mechanism and the blade, shorten the cleaning time, and achieve water saving.
Moreover, since the water spray hole 58 that can spray water toward the main plate 17 is provided at the lowermost end 59 of the water spray nozzle, there is little residual water of the cleaning liquid 51 to the injection port at the time of stop, and the nozzle clogging due to the scale is suppressed. Can do.

  Note that a heater or the like may be mounted on the watering nozzle 54 to raise the temperature of the cleaning liquid 51 to be a higher temperature cleaning liquid 51, or may be sprayed by heating steam or the like. Further, a plurality of watering nozzles 54 may be arranged, and the spray shape may be not only a round shape but also a holo cone or a slit.

  Further, the watering nozzle 54 may be movable so that the direction of watering can be changed. In this case, the cleaning liquid 51 can be sprayed over a wider range. The water supply of the cleaning liquid 51 to the water storage device 52 may be at a high temperature, or may be performed by adding an additive such as a surfactant or an alkali salt.

  Further, the water supply to the water storage device 52 may be self-contained from the water supply, or the additive may be automatically charged. A plurality of holes 56 may be provided in the cleaning casing 50 in addition to the lower end portion of the cleaning casing 50.

  In the present embodiment, the blower including the casing 14 has been described. However, as the cleaning casing 50, the scroll plate 32, the casing front plate 33, the casing back plate 34, the tongue portion 35, and the extending plate 36 are used. And not all the extension plates 37 are necessarily provided. If the machine body is formed by the casing front plate 33, the casing back plate 34, the scroll plate 32 sandwiched between the casing front plate 33, the casing rear plate 34, and the extended plate 36 on which the watering nozzle 54 is installed so that the cleaning solution 51 can be stored at the time of cleaning, the cleaning solution 51. Can be sprayed, and the sprayed cleaning liquid 51 can be stored. In this case, the scroll plate 32 does not have to gradually expand the air path. This is because the blade 15 and part of the oil collecting mechanism 30 can be immersed in the cleaning liquid 51 as long as it surrounds the lower side of the rotating shaft 21 of the impeller 10. In particular, the present invention can be applied to a plate fan or a turbo fan that does not require a scroll plate that gradually expands the air path.

  The range hood according to the present invention is capable of cleaning the entire impeller including the main plate and maintaining the aesthetic appearance of the impeller after cleaning. Further, the oil collecting mechanism and blade of the impeller involved in collecting oil smoke Since the cleaning power is further strengthened, the cleaning time is shortened, and water saving is realized, it can be applied to a ventilator having the same function.

DESCRIPTION OF SYMBOLS 1 Range hood 2 Main body 3 Wall surface 4 Outlet 5 Duct 6 Hood part 7 Lower surface 8 Suction port 9 Top surface 10 Impeller 11 Blower 12 Washing device 13 Motor 14 Casing 15 Blade 16 Side plate 17 Main plate 18 Blower inlet 21 Rotating shaft 30 Oil Collection mechanism 31 Blower outlet 32 Scroll plate 33 Casing front plate 34 Casing back plate 35 Tongue 36 Extension plate 37 Extension plate 38 Side portion 39 Orifice 40 Shaft 50 Cleaning casing 51 Cleaning liquid 52 Water storage device 53 Water supply pump 54 Watering nozzle 55 Drain tray 56 hole 57 On-off valve 58 Sprinkling hole 59 Bottom end of watering nozzle 101 Suction port 102 Hood 103 Wall surface 104 Duct 105 Discharge port 106 Rotating shaft 107 Electric motor 108 Impeller 109 Washing casing 110 Ventilation path 111 Conditioning Plate 112 cleaning liquid 113 water storage apparatus 114 feed pump 115 water spray nozzle 116 hole 117 opening and closing valve 118 drainage tray 119 main plate 120 blade 121 oil collecting mechanism

Claims (3)

An impeller rotated by an electric motor, an oil collecting mechanism provided integrally with the impeller, a cleaning casing for immersing the oil collecting mechanism in a cleaning liquid, and the cleaning liquid stored in the cleaning casing In the range hood that provides an on-off valve, closes the on-off valve, stores the cleaning liquid, and sprays the cleaning liquid onto the impeller to wash the impeller and the oil collecting mechanism.
The impeller has a cage cylindrical shape including at least a plurality of blades, an annular side plate, and a circular main plate, and extends from the side plate side toward the main plate side toward the impeller in the cylinder of the impeller. A hollow bar-shaped watering nozzle is installed.
A range hood provided with a water spray hole capable of spraying at least a blade, an oil collecting mechanism part, and a main plate in the water spray nozzle so that the cleaning liquid can be landed in the direction opposite to the rotation direction of the impeller. The range hood according to claim 1, wherein the watering nozzle extends into the cylinder of the impeller above the rotation shaft of the impeller, and has a watering hole at the lowermost end that can sprinkle toward the main plate. The range hood as described in any one of Claim 1 or 2 provided with the heater which raises the temperature of the washing | cleaning liquid upstream of the injection outlet of the said watering nozzle.