JP2018054165A - Range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To clear dust depositing on an outside air introduction filter without generating loud noise at the time of operation to supply air (introduce outside air) stably for a long term.SOLUTION: A range hood includes: an exhaust unit 2; an air supply unit 60 for supplying outside air into a room interior from an air supply port 61; and a filter storage part 65 connected to an exhaust port 4 and the air supply port 61. A pre-filter 66 is rotatably installed inside the filter storage part 65. The pre-filter 66 positioned in a second ventilation passage (air supply) can rotatably move to a first ventilation passage (exhaust).SELECTED DRAWING: Figure 1

Description

  The present invention relates to cleaning of a dust collecting part of a range hood having an air supply / exhaust function.

  Conventionally, as shown in FIG. 15, this type of range hood sucks indoor air from a lower opening 101 and discharges it from an exhaust port 102 at the top of the main body. An exhaust chamber 105 connected to the installed exhaust duct 104 and attached so as to cover the exhaust port 102 at the top of the range hood main body 103, and an air supply duct installed at the top of the range hood main body 103 for supplying outside air into the room And an air supply chamber 107 connected to 106. When the range hood main body 103 is operated to exhaust indoor air, the outdoor air can be supplied from the air supply chamber 107, so that the indoor pressure does not become significantly negative compared to the outdoor, and the efficiency Ventilation was possible (see, for example, Patent Document 1).

  There has also been known a ventilator that is equipped with a filter at an outside air inlet opening on the outer wall of a building and removes dust adhering to the filter using compressed air. As shown in FIG. 16, compressed air is jetted toward the filter 203 on the downstream side of the filter 203 provided in the outside air inlet 202 opened on the outer wall surface of the building 201, and dust attached to the filter is removed. Dust removing means 204 for removing is provided. The dust removing means 204 includes a compressor 205, a pressure tank 206, and an injection nozzle 207, and the injection nozzle 207 is disposed to face the filter 203.

  When dust adheres to the filter, compressed air is sprayed from the indoor side to the filter, so that the dust adhering to the outer surface of the filter is blown away and returned to its original state for stable supply over a long period of time. The air (introduction of outside air) was ensured (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 01-023057 Japanese Patent Laid-Open No. 10-160217

  In such a conventional range hood, as shown in FIG. 15, outdoor air can be supplied from the air supply chamber 107, but when the outside air contains substances such as dust, moths and mosquitoes. There was a problem of introducing them indoors.

  In addition, as shown in FIG. 16, in the method of cleaning by installing a filter at the outside air inlet opening in the outer wall, even if the outside air contains unpleasant substances such as dust, moths and mosquitoes, it can be removed by the filter. it can. However, since the filter is located at a high position on the outer wall surface of the house, maintenance at the time of failure is very difficult, and it is difficult to equip the wall surface of a high-rise house. Moreover, since the compressor 205 and the pressure tank 206, which are heavy objects, are provided on the ceiling, it is necessary to reinforce the back of the ceiling and perform electric piping work, and maintenance thereof is difficult. Furthermore, there has been a problem that the operating sound of compressed air becomes unpleasant noise.

  Accordingly, the present invention solves the above-described conventional problems, and cleans the dust adhering to the outside air introduction filter without generating a large noise during operation, and stably supplies air (introduction of outside air) over a long period of time. The purpose is to provide a range hood that can supply and exhaust air.

  In order to achieve this object, the present invention provides an exhaust port and an air supply port which are provided in the upper part of the main body and communicate with the outdoors, an upper opening and a lower opening which communicate with the room, and an exhaust fan. An air exhaust unit that sucks indoor air from the opening and discharges air from the exhaust port through the first ventilation path and an air supply fan are arranged to introduce outside air from the air supply port, and through the second ventilation path. The air supply unit has an air supply / exhaust function including an air supply unit that supplies air into the room from the upper opening, and a prefilter that crosses the first and second air passages on the indoor side of the exhaust port and the air supply port. In the range hood, the prefilter is a rotating body having a mesh body portion having an opening capable of collecting dust and an opening portion larger than a cross section of the first ventilation path, Depending on the filter rotation position, The mesh body and the opening are capable of crossing the first ventilation path and the second ventilation path, or the second ventilation path and the first ventilation path, and the first ventilation path. A range hood having a cleaning brush in contact with the pre-filter on the downstream side of the rotation of the pre-filter in the path is achieved, thereby achieving the intended purpose.

  According to the present invention, there is provided a range hood having an air supply / exhaust function which can stably supply air (introducing outside air) over a long period of time by cleaning dust adhering to the outside air introduction filter without generating a large noise during operation. can do.

The front view which shows the range hood of Embodiment 1 of this invention Side view of the same range hood Cross section of the same range hood Side cross-sectional configuration diagram of the exhaust unit Oblique configuration diagram of the impeller of the exhaust unit Configuration diagram showing casing of the exhaust unit Configuration view of the filter hood of the same range hood from the top The block diagram which shows the example of the pre filter of the same range hood Block diagram showing the configuration of the same range hood Flow chart showing operation of cleaning mode of same range hood Schematic sectional view showing the pre-filter and cleaning brush of the same range hood Schematic sectional view showing the state of pre-filter cleaning of the same range hood Enlarged view showing the shutter and guide part of the same range hood Enlarged view showing the shutter and guide part of the same range hood Sectional block diagram which shows the range hood of the conventional patent document 1 Cross-sectional block diagram which shows the ventilation apparatus of the conventional patent document 2

  A range hood according to claim 1 of the present invention is provided with an exhaust port and an air supply port which are provided at the upper part of the main body and communicate with the outdoors, an upper opening and a lower opening which communicate with the room, an exhaust fan, and the lower opening. An air exhaust unit that sucks indoor air from the exhaust air and exhausts the air from the exhaust port through a first air passage, and an air supply fan are arranged to introduce outside air from the air supply port, and the upper part through the second air passage A range hood having an air supply / exhaust function, comprising an air supply unit that supplies air into the room through an opening, and a prefilter that crosses the first ventilation path and the second ventilation path on the indoor side of the exhaust port and the air supply port The prefilter is a rotating body including a mesh body portion having an opening capable of collecting dust and an opening larger than a transverse section of the first ventilation path, and the prefilter rotation Depending on the position, The body part and the opening are capable of crossing the first ventilation path and the second ventilation path, or the second ventilation path and the first ventilation path, and in the first ventilation path. A cleaning brush that contacts the prefilter is provided on the downstream side of the rotation of the prefilter.

  As a result, even if the outdoor air contains substances such as dust, moths and mosquitoes, it can be removed by the prefilter provided in the second ventilation path. The effect that it is not introduced can be obtained. Furthermore, fine particles such as PM2.5 can be removed by passing through the main filter.

  In addition, because the pre-filter is rotatable, the pre-filter that is located in the second air path and collected unpleasant substances such as dust, moths and mosquitoes at the time of air supply rotates horizontally. It can be made to move to the 1st wind path side, and an exhaust wind can be directed toward upper direction from the downward direction. Thereby, the unpleasant substance adhering to the upper surface side of the pre-filter can be discharged to the outside by the dynamic pressure of the exhaust air, and the filter can be cleaned. Dust and the like that cannot be removed by the dynamic pressure of the exhaust air can be separated by a brush in contact with the prefilter, and are discharged to the outside by the exhaust air. If there is still agglomerated dust that cannot be discharged, the agglomerated dust falls to the top of the blades of the blower and is crushed from a large agglomerated state into small dusts due to collision with the rotating blades, making it easier to float. It can be discharged outside by wind.

  Even when fine dust adheres to the blade of the blower, since the cleaning device for cleaning the impeller and the control unit are provided, the dust attached by washing with water can be removed, and the range hood can be kept clean.

  Moreover, since the main filter, the filter storage part, and the pre-filter are provided in the upper part of the range hood main body, maintenance can be performed collectively from the room in the event of a failure. It is not necessary to perform a high place maintenance work in the case, and it is possible to obtain an effect that the handling property is excellent.

  In addition, it is possible to provide a range hood that does not include a heavy object such as a pressure tank, does not require strength reinforcement work for a house, and has an air supply / exhaust function with low operation noise.

  Further, the area of the opening of the mesh body is equal to or larger than the area of the cross section of the ventilation path. Thereby, the air can be discharged without reducing the exhaust air volume of the range hood while maximizing the area of the net portion for collecting dust, moths and insects.

  The range hood according to claim 2 is characterized in that the air volume of the exhaust unit is larger than the air volume of the air supply unit. As a result, the force for separating dust, moths and insects from the pre-filter during filter regeneration increases, and unpleasant substances can be reliably discharged out of the room from the exhaust unit.

  The range hood according to claim 3 is characterized in that two pairs of upper and lower cleaning brushes in contact with the prefilter are provided so as to sandwich the prefilter. Thereby, the dust adhering to the pre-filter can be rubbed with the brush from above and below, and the filter can be cleaned by further improving the separation performance of the dust from the filter.

  A range hood according to a fourth aspect is characterized in that the filter housing portion is provided with a shutter that can be moved up and down. As a result, it is possible to obtain an effect that dust, moths and insects do not remain in the second ventilation path which is the air supply path without following the rotation of the prefilter, and further improve the cleaning performance. Can do.

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

(Embodiment 1)
As shown in FIG. 1, the range hood 1 with an air supply / exhaust function according to the present embodiment includes an exhaust port 4 and an air supply port 61 communicating with the outdoors at the upper part of the main body, and an upper opening 64 and a lower opening communicating with the room. 8 and. Further, as shown in FIG. 3, a blower 11 as an exhaust fan is disposed inside, indoor air is sucked from the lower opening 8, and air is discharged from the exhaust port 4 through the first ventilation path 39. The exhaust unit 2 and the air supply fan 62 are arranged, outside air is introduced from the air supply port 61, and the air supply unit 60 is supplied into the room from the upper opening 64 through the second ventilation path 40. A pre-filter 66 that crosses the first ventilation path 39 and the second ventilation path 40 on the indoor side of the air vent 61 is provided.

  Hereinafter, the exhaust unit 2, the air supply unit 60, and the prefilter 66 will be described in this order.

  First, as shown in FIG. 2, the exhaust unit 2 is installed on the wall surface 3, and an exhaust duct 5 is connected to the exhaust port 4 to communicate with the outdoors. The exhaust unit 2 is a box provided with a hood part 7 so as to collect oil smoke generated from the cooking utensil 6 above the cooking utensil 6 such as a pan, and the lower opening 8 is provided on the lower surface of the hood part 7. I have.

  FIG. 3 is a schematic cross-sectional view of FIG. 2 viewed from the A-A ′ direction. FIG. 4 is a schematic cross-sectional view of the exhaust unit 2 part. Inside the exhaust unit 2, a blower 11 as an exhaust fan including the impeller 10, a cleaning device 12 that cleans the impeller 10, and a control unit 13 are provided.

  In addition to the impeller 10, the blower 11 as an exhaust fan includes an electric motor 14 that rotates the impeller 10 and a cleaning casing 15 that surrounds the impeller 10. The cleaning casing 15 is provided with an inlet 19 and an outlet 23 for blowing air.

  As shown in FIG. 5, the impeller 10 includes at least a plurality of blades 16, an annular side plate 17, and a circular main plate 18. The blade 16 is arranged so that both ends are sandwiched between a side plate 17 located on the inlet 19 side of the cleaning casing 15 and a main plate 18 located on the motor 14 side.

  The blades 16 are erected on the outer periphery of the main plate 18 and are arranged in a ring shape. That is, the blades 16 are arranged on the same circumference. The blade 16 is arranged with a gap so that the linear flow path from the outer periphery to the inner periphery of the impeller 10 does not interfere with the adjacent blade 16 within a predetermined angle range.

  Further, as shown in FIG. 5, ring-shaped oil collecting mechanism portions 20 that circulate around the inner periphery of the impeller 10 are arranged at a certain distance (for example, 15 mm) from each other in the direction of the rotation shaft 21. Two or more sheets are attached. In addition, the fixed distance between the oil collection mechanism parts 20 should just be an optimal distance, and is not restricted to the thing of this Embodiment. Moreover, the oil collection mechanism part 20 is not essential.

  As shown in FIG. 6, the cleaning casing 15 includes a scroll plate 24, a casing front plate 25, a casing back plate 26, a tongue portion 27, and an extension of the scroll plate 24 arranged so as to sandwich the scroll plate 24. An extension plate 28 provided and an extension plate 29 provided on the extension of the tongue 27 are provided. In the cleaning casing 15, the extension plate 28 and the extension plate 29 are not essential.

  The casing front plate 25 and the casing rear plate 26 are flat plates arranged at a predetermined interval corresponding to the height direction of the impeller 10 (the distance between the side plate 17 and the main plate 18 in FIG. 5).

  The scroll plate 24 is a curved plate that expands the air path along the rotation direction of the impeller 10 when the impeller 10 is blown on the outer periphery of the impeller 10 with the tongue portion 27 as a base point. The extended plate 28 is a flat plate in which the scroll plate 24 is further extended to the outlet 23. The extension plate 29 is a flat plate extending from the side opposite to the rotation direction of the tongue portion 27 during blowing to the outlet 23.

  Further, the scroll plate 24 is disposed over the main part of the side surface portion 30 of the cleaning casing 15. The side surface of the cleaning casing 15 occupies a range of about 300 degrees from the tongue portion 27 in the air blowing rotation direction of the impeller 10.

  The outlet 23 is formed by being surrounded by the end portions of the casing front plate 25, the casing back plate 26, the extension plate 28, and the extension plate 29. When the extension plate 28 and the extension plate 29 are not provided, the casing front plate 25, the casing rear plate 26, the scroll plate 24, and the tongue 27 may be surrounded by the end portions.

  Further, the cleaning casing 15 is provided with a circular inflow port 19 at a substantially central portion, and an orifice 31 is provided around the circular inflow port 19. Moreover, the electric motor 14 is arrange | positioned at the casing backplate 26 side, and the impeller 10 is rotated through the shaft 32 from the electric motor 14 (refer FIG. 4).

  As shown in FIG. 4, the cleaning casing 15 is disposed inside the exhaust unit 2 so that the casing front plate 25 and the casing rear plate 26 stand up. In other words, the impeller 10 is arranged with the rotating shaft 21 sideways, and the outflow port 23 is arranged upward.

  The inlet 19 opens inside the exhaust unit 2 and communicates with the lower opening 8. A portion communicating from the lower opening 8 to the inlet 19, the blower 11, the outlet 23, and the exhaust port 4 is referred to as a first ventilation path 39.

  A rotation speed sensor (not shown) and a current sensor (not shown) are provided inside the electric motor 14 to detect the rotation speed and current value of the electric motor 14. This is because a Hall IC is preferable as the rotation speed sensor, and the cost is low and the accuracy is high.

  As shown in FIG. 4, the cleaning device 12 includes a cleaning casing 15 of the blower 11, a water storage device 34 that stores the cleaning liquid 33, a water supply unit 35, and a drain tray 36. The cleaning casing 15 serves as both components of the blower 11 and the cleaning device 12. The water storage device 34 is provided below the cleaning casing 15.

  As shown in FIG. 6, the cleaning casing 15 is provided with a hole 37 as a drain outlet at the lower end, and the hole 37 is provided with an opening / closing valve 38 for storing the cleaning liquid 33 in the cleaning casing 15. A drain tray 36 is disposed on the side.

  As shown in FIG. 4, the cleaning casing 15 includes a water level detection unit 42 so that the water level when the cleaning liquid 33 is stored can be detected. Various types of water level sensors such as a float type, a capacitance type, and a pressure type can be applied to the water level detection unit 42. In the first embodiment, a low cost float type is adopted. .

  The water supply unit 35 includes a water supply nozzle 43 and a water supply pump 44. The water supply nozzle 43 is provided above the scroll plate 24 in the cleaning casing 15.

  The water supply pump 44 is provided above the water storage device 34 and at the lower back of the hood portion 7, and the water storage device 34 and the water supply pump 44 communicate with each other by a cylindrical first pipe 45. The first pipe 45 is provided on the suction side that is the upstream side of the water supply pump 44. A cylindrical second pipe 46 is provided on the outlet side, which is the downstream side of the water supply pump 44. The cleaning liquid 33 in the water storage device 34 is sucked up by the water supply pump 44 to the water supply pump 44 through the first pipe 45 and is supplied to the water supply nozzle 43 through the second pipe 46, and is supplied from the water supply nozzle 43 to the cleaning casing 15. Can be supplied with water.

  Next, the air supply unit 60 will be described with reference to FIGS. 1 to 3. As shown in FIG. 2, the air supply unit 60 is installed in the upper part of the exhaust unit 2 and includes an air supply port 61, an air supply fan 62, and a main filter 63. On the downstream side of the main filter 63, an upper opening 64 that opens toward the room is provided, and air purified by the main filter 63 is supplied to the room. A portion communicating from the air supply opening 61 to the air supply fan 62, the main filter 63, and the upper opening 64 is referred to as a second ventilation path 40.

  The type of the main filter 63 is not particularly limited, and a general resin pleated filter may be used. In particular, a filter capable of collecting fine particles of about 2.5 μm called PM2.5 is preferable. The main filter 63 may be in the second ventilation path of the air supply unit 60. However, it is preferable to install the main filter 63 at a position facing the upper opening 64 because maintenance and replacement are easy.

  Next, the prefilter 66 will be described with reference to FIGS. 1 to 3 and FIG. As shown in FIG. 3, the pre-filter 66 is stored in the filter storage unit 65.

  In addition to the pre-filter 66, the filter storage unit 65 includes a cleaning brush 67, a drive unit 68 that rotates the pre-filter 66, and a gear 69, as shown in FIG.

  The prefilter 66 is a disk-shaped net body 70 having an opening that can collect dust, and a metal net, a resin net, or the like can be used. You may use the punching metal which opened the hole in the metal plate. What is necessary is just to have the opening which can collect substances, such as dust, a cocoon, and a mosquito, and about 0.1-8.0 mm is good for an opening. A rotating shaft 71 is provided at the center of the disc-shaped net body 70, and the prefilter 66 is rotatable.

  The mesh body 70 is disposed so as to cross the first ventilation path 39 and the second ventilation path 40, and the mesh body 70 has an opening 72 that is equal to or larger than the cross section of the first ventilation path 39. I have.

  The cleaning brush 67 is in contact with the pre-filter 66 and is disposed at a location in contact with the first ventilation path. One cleaning brush 67 may be provided on the upper surface of the mesh body 70, or two pairs of cleaning brushes 67 may be provided on the upper and lower surfaces of the mesh body 70.

  FIG. 8 shows an example of the prefilter 66. In FIG. 8A, the mesh body 70 is provided with a circular opening 72, and a substantially circular frame 73 is provided on the outer edge of the mesh body 70. A groove 74 is formed in the frame 73, and meshing with the gear 69 allows the rotational operation of the gear 69 to be transmitted to the pre-filter 66 so that the rotational direction and rotational speed can be controlled. FIG. 8B is another example provided with a semicircular opening 72, in which the area of the opening 72 is increased. The area of the opening 72 of the net body 70 may be equal to or larger than the area of the cross section of the ventilation path.

  9 includes an air supply mode for driving the air supply fan 62, an air supply / exhaust mode for driving the blower 11, a supply / exhaust mode for simultaneously driving the air supply fan 62 and the blower 11, and the blower 11. A cleaning mode for driving the drive unit is provided. That is, the control unit 13 controls the operation of the blower 11 (electric motor 14), the air supply fan 62, the prefilter 66 (drive unit 68), the timer 75, the position detection means 76, and the display lamp 77. It is. It is assumed that the blower 11 (electric motor 14), the air supply fan 62, the pre-filter 66 (drive unit 68), the timer 75, and the position detection means 76 are electrically connected by wire.

  The cleaning mode will be described with reference to FIGS. 7, 10, 11, and 12.

  When the air supply fan 62 is operated at the position shown in FIG. 7A where the opening 72 is located in the first ventilation path 39 and the net body 70 blocks the second ventilation path 40, dust contained in outdoor air or Substances such as moths and mosquitoes can be attached to the upper surface side of the pre-filter 66. This is the air supply mode.

When the user selects the cleaning mode with the operation unit 48 (FIG. 4) (S1), the display lamp 77 is turned on (S2), and the operation of the air supply fan 62 is stopped (S3). Next, when the blower 11 is operated (S4) and the driving unit 68 is operated, the prefilter 66 is rotated in the horizontal direction via the gear 69. Here, a case where the prefilter 66 rotates clockwise will be described. In response to the signal from the position detecting means 76,
When it is detected that the opening 72 of the pre-filter 66 is located in the second ventilation path 40 and the net body 70 that has blocked the second ventilation path 40 has come to a position that blocks the first ventilation path 39, the driving is started. The unit 68 stops (S6). At this time, the portion to which substances such as dust, moths and mosquitoes are attached is moved to the exhaust side which is the first ventilation path 39. Since the blower 11 is operated in this state, the exhaust air is blown upward from below and substances such as dust, soot and mosquitoes adhering to the upper surface side of the pre-filter 66 are exposed outdoors by the dynamic pressure of the exhaust air. To be discharged. Thereby, the filter can be cleaned. This is continued by the timer 75 for a first predetermined time (S7).

  Further, as shown in FIG. 11, substances such as dust, moths and mosquitoes that cannot be removed by the dynamic pressure of the exhaust air can be separated by a cleaning brush 67 in contact with the net body 70 of the pre-filter 66, and the exhaust air Is discharged outside the room. In FIG. 7 (b), the drive unit 68 is operated (S8) from the state of FIG. 11 (a), and the prefilter is further rotated in the clockwise direction in FIGS. 11 (b) and 11 (c). This can be realized by removing the dust 78 as described above. When it is detected that the pre-filter 66 has reached the position shown in FIG. 7A, the drive unit 68 stops (S9). At this time, if there is agglomerated dust 78 that cannot be exhausted by the exhaust air, the dust falls onto the upper part of the blade 16 of the blower 11 as shown in FIG. It is crushed into small dust and becomes easy to float, and can be discharged to the outside with exhaust air. This is continued by the timer 75 for a second predetermined time (S10).

  In addition, when the air volume of the exhaust unit 2 is larger than the air volume of the air supply unit 60, the force for separating dust, moths and insects from the pre-filter during filter regeneration increases, so that dust and dirt can be reliably removed from the exhaust unit to the outdoor. Substances such as moths and insects can be discharged. For example, by setting the air volume of the air supply unit 60 to 100 m 3 / h and the air volume of the exhaust unit 2 to 400 m 3 / h, the exhaust air flows through the prefilter 66 at a surface wind speed four times that of the air supply, It is possible to reliably discharge unpleasant substances outside the room.

  Finally, the blower 11 is stopped (S11), and the display lamp 77 is turned off (S12), thereby completing the cleaning mode.

  The filter storage unit 65 may be provided with a shutter 81.

  As shown in FIGS. 8, 13, and 14, the frame 73 provided at the center and the outer periphery of the pre-filter 66 is provided with a guide 79 at the top. There is a partition wall 80 in the upper part across the rotation shaft 71 at the center of the prefilter 66, and the partition wall 80 partitions the prefilter 66 into two regions. 8A, the partition 80 on the upstream side in the rotation direction of the pre-filter 66 when viewed from the first ventilation path 39 (the side indicated by the partition 82 with respect to the rotation shaft 71) is shown on the lower side in FIG. The shutter 81 which can be moved up and down as shown in FIG. When the pre-filter 66 is rotated, the height of the guide 79 gradually increases in the order of FIGS. 14A, 14B, and 14C, and the shutter 81 is moved upward in accordance with the height. The shutter 81 moves upward, and a space 83 is created between the shutter body 81 and the net body 70. With this space 83, dust, moths and insects adhering to the upper surface of the pre-filter 66 can be moved from the second ventilation path 40 toward the first ventilation path 39 without contacting the lower part of the shutter 81. Accordingly, it is possible to obtain an effect that dust, moths and insects do not remain in the second ventilation path 40 without following the rotation of the prefilter 66.

  The range hood according to the present invention cleans dust adhering to the outside air introduction filter without generating a large noise during operation, and can stably supply air (introduction of outside air) over a long period of time. It can also be applied to ventilators with a mark.

DESCRIPTION OF SYMBOLS 1 Range hood 2 Exhaust unit 3 Wall surface 4 Exhaust port 5 Exhaust duct 6 Cooking utensil 7 Hood part 8 Lower opening part 10 Impeller 11 Blower 12 Washing device 13 Control part 14 Electric motor 15 Cleaning casing 16 Blade 17 Side plate 18 Main plate 19 Inlet 20 Oil collecting mechanism 21 Rotating shaft 23 Outlet 24 Scroll plate 25 Casing front plate 26 Casing back plate 27 Tongue portion 28 Extending plate 29 Extension plate 30 Side surface portion 31 Orifice 32 Shaft 33 Cleaning liquid 34 Water storage device 35 Water supply portion 36 Drain tray 37 hole 38 on-off valve 39 first ventilation path 40 second ventilation path 43 water supply nozzle 44 water supply pump 45 first pipe 46 second pipe 48 operation unit 60 air supply unit 61 air supply port 62 air supply fan 63 main Filter 64 Upper opening 65 Filter housing 66 Refilter 67 Cleaning brush 68 Drive part 69 Gear 70 Net body 71 Rotating shaft 72 Opening part 73 Frame 75 Timer 76 Position detection means 77 Display lamp 78 Dust 79 Guide 80 Bulkhead 81 Shutter 82 Bulkhead 101 Lower opening part 102 Exhaust port 103 Range hood main body DESCRIPTION OF SYMBOLS 104 Exhaust duct 105 Exhaust chamber 106 Air supply duct 107 Air supply chamber 201 Building 202 Outside air introduction port 203 Filter 204 Dust removal means 205 Compressor 206 Pressure tank 207 Injection nozzle

Claims (4)

An exhaust port and an air supply port connected to the outside in the upper part of the main body,
An upper opening and a lower opening communicating with the room;
An exhaust unit that arranges an exhaust fan, sucks indoor air from the lower opening, and discharges air from the exhaust port through a first ventilation path;
An air supply unit that arranges an air supply fan, introduces outside air from the air supply port, and supplies the air into the room from the upper opening through a second ventilation path;
A range hood having an air supply / exhaust function including a pre-filter crossing the first ventilation path and the second ventilation path on the indoor side of the exhaust port and the air supply port,
The prefilter is a rotating body having a mesh body portion having an opening capable of collecting dust and an opening portion larger than a transverse section of the first ventilation path,
Depending on the pre-filter rotation position, the mesh body and the opening can cross the first ventilation path and the second ventilation path, or the second ventilation path and the first ventilation path. A range hood comprising a cleaning brush that contacts the prefilter on the downstream side of the rotation of the prefilter in the first ventilation path. The range hood according to claim 1, wherein the air volume of the exhaust unit is larger than the air volume of the air supply unit. The range hood according to claim 1 or 2, wherein two pairs of upper and lower cleaning brushes in contact with the prefilter are provided so as to sandwich the prefilter. The range hood according to any one of claims 1 to 3, wherein the filter housing portion includes a shutter that is movable up and down.