JP4875383B2 - Range hood fan - Google Patents

Description

  The present invention relates to a range hood fan, and more particularly, to a range hood fan capable of efficiently and constantly ventilating exhaust gas staying near a ceiling.

The conventional range hood fan is installed so that exhausts such as oil smoke, odors, and steam rising from a cooking table or the like during cooking are sucked as efficiently as possible and exhausted to the outside. In recent years, in addition to the one installed along the wall of the cooking chamber, a so-called center hood type range hood fan has been developed that does not follow the wall, that is, a high-performance fan that meets the original purpose. Has been.
However, as can be said with any range hood fan, it is practically impossible to suck and exhaust 100% of exhaust gas such as oil smoke, odor, and steam generated from the cooking table. Naturally, the exhaust that could not be inhaled by the range hood fan rose, stayed mainly near the ceiling of the cooking chamber, diffused naturally with time and remained odor even after cooking It has become.
On the other hand, when a new house is built or renovated, sick house is a problem. Sick house syndrome is caused by the release of harmful substances generated from building materials, adhesives, volatile solvents, etc. into the room, whereas by using a range hood fan to constantly ventilate the room, There are attempts to reduce the impact of sick houses.

In order to solve the problem of exhaust gas staying near the ceiling as described above, in the conventional range hood, a second suction port is provided in a portion corresponding to the ceiling surface in the upper portion of the hood main body. There is one configured to suck and exhaust the exhaust gas staying near the ceiling. (See Patent Documents 1 to 3)
Among these things, the exhaust that stays near the ceiling as well as the exhaust that is generated at the cooking table by one exhaust fan, and the exhaust that stays near the ceiling are dedicated in addition to the main exhaust fan Some have an auxiliary fan to suck in.
However, these range hood fans are provided with a second suction port, so that the main exhaust efficiency is lowered, and because the auxiliary fan is small, the suction power is relatively weak, and a large amount of exhaust gas stays near the ceiling. In such a case, it takes a considerable time to exhaust the air.
JP 2005-90878 A Japanese Patent Laid-Open No. 10-205846 JP-A-8-271000

  The present invention has been made in view of the above-described conventional circumstances, and the purpose of the present invention is to selectively change the operating state of the range hood fan in accordance with the state of occurrence of exhaust gas. An object of the present invention is to realize a quick exhaust and a continuous exhaust of the exhaust gas staying near the ceiling with a simple configuration while maintaining the exhaust efficiency.

The present invention employs the following technical means in order to achieve the above object.
A range hood fan according to a first aspect of the present invention includes a hood main body having an upper portion located near the ceiling of the room and a lower portion provided with a suction port. A main exhaust fan is provided in the lower portion of the internal space of the hood main body. An upper exhaust fan is installed in the upper position of the internal space of the hood body, and the exhaust sucked from the suction port at the lower portion of the hood body is exhausted from the main exhaust fan to the outside through an exhaust duct, An upper suction port is opened in the upper part of the main body so that it faces the inlet of the upper exhaust fan, and a communication path is formed in the hood body between the exhaust side of the upper exhaust fan and the intake side of the main exhaust fan. The movable damper is provided in the middle of the communication path, and the movable damper closes the middle of the communication path to allow the hood main body suction port and the main exhaust fan to communicate with each other. And between the closed position, which is constituted so as to selectively move between the main exhaust fan and the lower closed position allowed to open the intermediate contact path brought closed between the hood body suction port.
The operation of the movable damper described above may be performed using a drive motor or the like, or may be performed manually by a user. The driving of the main exhaust fan and the upper exhaust fan may be controlled individually using an existing control mechanism, or may be controlled in conjunction with the operation of the movable damper. Further, the shape, size, number, etc. of the upper suction port of the hood main body may be arbitrarily changed.
The range hood fan operates only the main exhaust fan to move the movable damper to the intermediate closed position, and operates the upper exhaust fan only to move the movable damper to the lower closed position. And a control mechanism for selectively controlling the mode and the upper quick exhaust mode in which both the main exhaust fan and the upper exhaust fan are operated and the movable damper is moved to the lower closed position.
The control mechanism includes a main exhaust mode, an upper exhaust mode, and an upper quick exhaust mode, as well as other exhaust modes in which the combination of the movable damper moving position and the operation of the main exhaust fan and the upper exhaust fan is changed. Also good. The main exhaust fan and the upper exhaust fan may be configured such that the air volume can be increased or decreased in stages, and combinations thereof may be arbitrarily set.

The range hood fan of the second invention is provided with a hood main body whose upper part is located in the vicinity of the ceiling in the room and provided with a suction port at the lower part, and a main exhaust fan is installed in the lower part of the internal space of the hood main body. An upper exhaust fan is installed in the upper position of the internal space of the hood body, and the exhaust sucked from the suction port at the lower portion of the hood body is exhausted from the main exhaust fan to the outside through an exhaust duct, An upper suction port is opened in the upper part of the main body so that it faces the inlet of the upper exhaust fan, and a communication path is formed in the hood body between the exhaust side of the upper exhaust fan and the intake side of the main exhaust fan. The movable damper is provided in the middle of the communication path, and the movable damper closes the middle of the communication path to allow the hood main body suction port and the main exhaust fan to communicate with each other. And between the closed position, which is constituted so as to selectively move between the main exhaust fan and the lower closed position allowed to open the intermediate contact path brought closed between the hood body suction port.
The operation of the movable damper described above may be performed using a drive motor or the like, or may be performed manually by a user. The driving of the main exhaust fan and the upper exhaust fan may be controlled individually using an existing control mechanism, or may be controlled in conjunction with the operation of the movable damper. Further, the shape, size, number, etc. of the upper suction port of the hood main body may be arbitrarily changed.
The range hood fan is provided with an exhaust introduction skirt member that is inclined from the ceiling surface toward the upper suction port on the upper peripheral surface of the hood main body. As long as the skirt member is inclined toward the upper suction port from the ceiling surface, the size and the inclination angle may be arbitrarily changed.

A range hood fan according to a third aspect of the present invention is such that the main exhaust fan and the upper exhaust fan are both constituted by a centrifugal multiblade fan. The air volume of the main exhaust fan and the upper exhaust fan may be arbitrarily changed. For example, the air volume of the upper exhaust fan may be kept smaller than the air volume of the main exhaust fan.

  In the range hood fan of the fourth invention, the main exhaust fan is constituted by a centrifugal multiblade fan, and the upper exhaust fan is constituted by a propeller fan. The above-mentioned probera fan may be in any form as long as it is an existing axial fan.

According to the edge member for a range hood of the present invention, the following excellent actions and effects can be expected.
Range hood fan of the first invention is to internally provided a main exhaust fan at the bottom position of the internal space of the full over de body, and internally provided with upper exhaust fan in the upper position of the hood body the interior space, the hood body lower Exhaust air sucked from the air intake port is exhausted from the main exhaust fan to the outside through the exhaust duct, and the upper air intake port faces the intake port of the upper exhaust fan, and the exhaust side of the upper exhaust fan The main exhaust fan is connected to the intake side via a communication path, and a movable damper is provided in the middle of the communication path. The movable damper closes the middle of the communication path to close the hood main body suction port and the main exhaust fan. It is possible to selectively move between an intermediate closed position that allows communication between the main exhaust fan and the hood body suction port and a lower closed position that opens the middle of the communication path. It is those that you configured.
Therefore, the user selectively sets the driving of the main exhaust fan and the upper exhaust fan and the moving position of the movable damper, so that the suction of the exhaust from the suction port of the lower portion of the hood body using the main exhaust fan, the upper part Efficient exhaust is performed by selecting the most appropriate operating mode according to the exhaust generation status, such as suction from the upper suction port using the exhaust fan and rapid suction from the upper suction port by moving both exhaust fans together. be able to.
In addition, by suppressing the air volume of the upper exhaust fan to a low level, it is possible to constantly ventilate the indoor air silently.
In addition, if a large amount of exhaust gas stays near the ceiling, or if you want to exhaust the exhaust generated on the ceiling in a short time, use the suction power of both exhaust fans to quickly suck from the upper suction port and quickly Therefore, oily smoke and odor residue can be effectively removed, and various exhaust modes can be realized.
The range hood fan operates only the main exhaust fan to move the movable damper to the intermediate closed position, and operates the upper exhaust fan only to move the movable damper to the lower closed position. And a control mechanism for selectively controlling the mode and the upper quick exhaust mode in which both the main exhaust fan and the upper exhaust fan are operated and the movable damper is moved to the lower closed position.
Therefore, the user simply selects an arbitrary mode from the above-described three exhaust modes according to the state of exhaust generation, so that the exhaust rising from the cooking table can be efficiently sucked and discharged, and from problems such as sick house For the purpose of discharging a small amount of chemical pollutants contained in indoor air to the outdoors, so-called 24-hour ventilation (always ventilating), and rapid exhaust of the exhaust near the ceiling for a short time Can be removed easily and rationally.

A range hood fan according to a second aspect of the present invention has a main exhaust fan installed in a lower position of the internal space of the hood main body, and an upper exhaust fan installed in an upper position of the internal space of the hood main body. Exhaust air sucked from the outlet is exhausted from the main exhaust fan to the outside through the exhaust duct, and the upper suction port faces the inlet of the upper exhaust fan and the exhaust side of the upper exhaust fan and the main exhaust The fan is connected to the intake side of the fan via a communication path, and a movable damper is provided in the middle of the communication path. This movable damper closes the middle of the communication path and connects the hood main body suction port and the main exhaust fan. Selectively move between an intermediate closed position where communication is possible and a lower closed position where the space between the main exhaust fan and the hood main body inlet is closed to open the middle of the communication path. It is those that you configured.
Therefore, the user selectively sets the driving of the main exhaust fan and the upper exhaust fan and the moving position of the movable damper, so that the suction of the exhaust from the suction port of the lower portion of the hood body using the main exhaust fan, the upper part Efficient exhaust is performed by selecting the most appropriate operating mode according to the exhaust generation status, such as suction from the upper suction port using the exhaust fan and rapid suction from the upper suction port by moving both exhaust fans together. be able to.
  In addition, by suppressing the air volume of the upper exhaust fan to a low level, it is possible to constantly ventilate the indoor air silently.
In addition, if a large amount of exhaust gas stays near the ceiling, or if you want to exhaust the exhaust generated on the ceiling in a short time, use the suction power of both exhaust fans to quickly suck from the upper suction port and quickly Therefore, oily smoke and odor residue can be effectively removed, and various exhaust modes can be realized.
And this range hood fan is provided with a skirt member for exhaust introduction inclined from the ceiling surface to the upper suction port on the upper peripheral surface of the hood main body, so suction started from the upper suction port. At this time, the exhaust gas stagnating in the vicinity of the ceiling is guided toward the upper suction port along the inclination of the skirt member, and the suction efficiency of the exhaust gas can be improved.
In addition, the ceiling surface near the suction port, which is relatively dirty due to the suction of exhaust gas, can be covered with the skirt member, which contributes to preventing the ceiling portion from being stained. Furthermore, the skirt portion is installed along the hood main body and the ceiling, so that the reinforcing effect of the hood main body can be obtained.

  The range hood fan according to the third aspect of the present invention comprises a centrifugal multi-blade fan in which both the main exhaust fan and the upper exhaust fan are configured, so that both exhaust fans are connected in series, and exhaust efficiency can be improved. In addition, there is an advantage that the resistance of the upstream exhaust fan that is likely to occur due to the series connection of the exhaust fans can be reduced as much as possible.

  The range hood fan according to the fourth aspect of the present invention is configured such that the main exhaust fan is constituted by a centrifugal multiblade fan and the upper exhaust fan is constituted by a propeller fan, so that the exhaust from the upper exhaust fan is effectively silenced. It is suitable for use in which exhaust is always performed by the upper exhaust fan.

The best mode for carrying out the range hood fan of the present invention will be described below with reference to FIGS.
1 and 2 show a range hood fan A embodying the present invention. In many cases, the range hood fan is installed so as to be incorporated in the system kitchen of the cooking chamber. However, the range hood fan A of the present invention protrudes downward from the ceiling surface B at an appropriate distance from the wall surface of the cooking chamber. It is the type that is installed in the form, so-called center hood. A cooking table is installed under the range hood fan A, and exhaust gas such as oil smoke and steam rises with cooking.
The range hood fan A has a rectangular hood main body 1 with a square cross section, and is installed so that the hood main body 1 extends downward from the ceiling surface B by attaching and fixing the upper end of the hood main body 1 to the ceiling surface B. It is. A hood 1a is attached to the lower end of the hood main body 1 so as to expand, and constitutes a suction port 1b for sucking exhaust gas rising from the cooking table. A rectifying plate 11 is mounted in the suction port, and a filter 12 is mounted on the rectifying plate 11.

  A sirocco-type main exhaust fan 2 is installed in the lower part of the internal space of the hood body 1, the back side to which the drive motor 2 c is fixed is attached and fixed to the hood body 1 side plate, and the suction port 2 a on the front side is sideways. The hood main body is arranged so as to be located substantially at the center. Further, an exhaust port 2 b opened in the outer peripheral portion of the main exhaust fan 2 is directed upward in the hood body 1 and is connected to an exhaust duct 4. The exhaust duct 4 is a cylindrical body having a rectangular cross section, and extends vertically to the top of the hood body 1 and is configured to pass through the ceiling surface B and connect to the external exhaust duct 40 to exhaust the exhaust toward the outside. It is.

An upper exhaust fan 3 is provided in the upper part of the internal space of the hood body 1. The upper exhaust fan 3 is a relatively small propeller fan, and a drive motor 3c on the suction side is attached and fixed to the upper structural plate 13 inside the hood main body 1 so that the propeller 3a faces downward. It is installed. The propeller 3a of the upper exhaust fan 3 installed in this way rotates in a form housed in a communication path 9 described later.
The exhaust fan described above may be of any form as long as it is an existing axial fan, but it should be quiet and suitable for constant operation. The size of the upper exhaust fan 3 may be smaller than the main exhaust fan 2, and the air flow value may be about 1/4 to 1/5 that of the main exhaust fan 2.

Upper suction ports 7 having slits arranged in parallel at a small interval are provided on the four surrounding surfaces near the upper end of the hood body 1 described above. The upper suction port 7 is an opening for sucking exhaust gas remaining in the vicinity of the ceiling surface B, and is disposed so as to face the suction side of the upper exhaust fan 3 provided in the hood main body 1.
A skirt member 8 is attached to the ceiling surface B along the four sides of the upper end of the hood body 1. The skirt member 8 is a rectifying plate for efficiently guiding the exhaust gas staying in the vicinity of the ceiling surface B to the upper suction port 7 opened on the peripheral surface of the hood body 1 as described above. It is attached so as to incline toward 7 above. In addition, you may change arbitrarily the width | variety and cross-sectional shape of this skirt member as needed. For example, it is optional to appropriately curve the cross section of the skirt member or increase or decrease the inclination angle.

A communication path 9 that connects the upper exhaust fan 3, the main exhaust fan 2, and the lower end of the hood main body 1 serving as a suction port is formed on one side in the internal space of the hood main body 1. The communication path 9 is formed of a cylindrical case 9 'having a substantially rectangular cross section for communicating the exhaust sucked from the suction port 1b and the upper suction port 7 to the suction port 2a of the main exhaust fan 2, and is movable in the middle portion thereof. A damper 5 is provided. The suction port 2a of the main exhaust fan 2 is connected to the side surface of the cylindrical case 9 ′ where the movable damper 5 is provided.
The movable damper 5 is provided at a position facing the suction port 2 a of the main exhaust fan 2, and is pivotally supported by a support shaft 5 c inserted into a cylindrical case 9 ′ constituting the communication path 9 so as to be rotatably supported. It is. The end portion of the support shaft 5c is connected to the drive motor 5d, and the movable damper 5 is operated by the drive motor 5d.
Further, partition plates 52 and 53 are attached to the upper and lower portions of the suction port 2a in the cylindrical case 9 ', and the leading edges thereof extend toward the shaft support position of the movable damper 5, An opening 50 a and an opening 50 b are formed between the movable damper 5 and the supporting shaft 5 c, and the openings 50 a and 50 b are opened and closed by the operation of the movable damper 5.
The openings 50a and 50b are the two operating positions of the movable damper 5, that is, the intermediate closing position 5a and the lower closing position 5b.

The range hood fan A configured as described above includes a control unit 10 including an operation panel 10a on the front surface of the hood 1a. The control unit 10 controls the driving of the main exhaust fan 2 and the upper exhaust fan 3 and the moving position of the movable damper 5, and the drive motors 2c, 3c of both the exhaust fans 2, 3 through electrical means, The drive motor 5d of the movable damper 5 is in communication.
The control unit 10 described above operates the main exhaust mode in which only the main exhaust fan 2 is operated, the upper exhaust mode in which only the upper exhaust fan 3 is operated, and the suction from the upper suction port 7 by operating both the exhaust fans 2 and 3 together. It has three exhaust modes with the upper quick exhaust mode. Therefore, the user can easily perform efficient exhaust by operating the operation panel 10a according to the use state of the cooking table and selecting an arbitrary mode from these exhaust modes.

Next, the operation in each exhaust mode will be described.
In normal use, it operates in the main exhaust mode in which the exhaust gas rising from the cooking table is sucked from the suction port 1b of the hood 1a. In the main exhaust mode, only the main exhaust fan 2 having a large air volume is driven to move the movable damper 5 to the intermediate closing position 5a (FIG. 3). As a result, the exhaust sucked from the suction port 1b of the hood 1a passes through the main exhaust fan 2 through the opening 50b, passes through the exhaust port 2b and the exhaust duct 40, and is discharged outside the room. At this time, the upper exhaust fan 3 is stopped, and the opening 50a is closed by the movable damper 5, so that the sucked exhaust does not enter the upper exhaust fan 3 side.

  For example, regardless of whether or not exhaust gas stays along the ceiling surface B, the upper exhaust mode in which only the upper exhaust fan 3 is operated can be used as ventilation (normal ventilation) in which indoor air is continuously operated for 24 hours. In the upper exhaust mode, only the upper exhaust fan 3 having a relatively small air volume is operated, and the movable damper 5 is moved to the lower closed position 5b (FIG. 4). As a result, the room air in the kitchen and living / dining room is gently sucked from the upper suction port 7 at the top of the hood body 1 with a low air volume, passes through the opening 50a and the upper exhaust fan 3, and flows into the exhaust duct 4. It is discharged outside the room. In this state, since the opening 50b is closed by the movable damper 5, the exhaust sucked by the upper exhaust fan 3 does not leak to the suction port 1b side.

In addition, when a large amount of exhaust gas stays on the ceiling surface B during cooking, the upper exhaust fan 3 and the main exhaust fan 2 may be operated in the upper rapid exhaust mode.
In the upper rapid exhaust mode, the upper exhaust fan 3 and the main exhaust fan 2 are operated together to move the movable damper 5 to the lower closed position 5b (FIG. 5).
As a result, the suction force of the two exhaust fans 2 and 3 connected in series is applied to the upper suction port 7 at the top of the hood body 1, and the exhaust gas staying near the ceiling surface B is rapidly sucked from the upper suction port 7. After passing through both exhaust fans 3 and 2 arranged in series, the exhaust duct 4 exhausts the outside. This upper rapid exhaust mode is extremely effective in removing exhaust gas staying on the ceiling surface B in a short time.

Next, the range hood fan A2 shown in FIGS. 6 and 7 will be described.
The range hood A2 is configured in the same manner as the range hood fan A described above, but a sirocco fan of the same type as the main exhaust fan 2 is installed as the upper exhaust fan 30. The upper exhaust fan 30 is installed with the suction port 30 a facing the upper space in the hood body 1, and the suction port 30 a faces the upper suction port 7 of the hood body 1. The exhaust port 30b of the upper exhaust fan 30 faces the upper portion of the communication path 9, and communicates with the intake port 2a of the main exhaust fan 2 through the opening 50a.
The range hood fan A2 surrounds the main exhaust fan 2 in the hood body 1 with partition plates 52 and 53, and bends both end portions on the suction port 2a side toward the pivotal support position of the movable damper 5. An opening 50 a and an opening 50 b are formed between the extended edge and the partition plate 51 that pivotally supports the movable damper 5, and the openings 50 a and 50 b are opened and closed by the operation of the movable damper 5. It is constituted as follows. As in the case described above, the openings 50a and 50b are portions that become two operating positions of the movable damper 5, an intermediate closing position 5a and a lower closing position 5b.

  The operation of the range hood fan A2 configured as described above is basically the same as that of the range hood fan A described above. However, in the operation of the upper rapid exhaust mode in which both the exhaust fans 2 and 30 are operated simultaneously, the exhaust capacity is high. high. When two exhaust fans are arranged in series as in the range hood fan of the present invention, especially when the air flow rate of the upstream exhaust fan is low, the upstream fan becomes the resistance of the flow path and the exhaust efficiency decreases. There are things to do. In such a case, in order to reduce the resistance of the upper exhaust fan 30 installed on the upstream side, a sirocco fan with a high static pressure is used, and the upper exhaust fan 30 is only operated at a low speed during the rapid exhaust mode operation. Instead, by selectively enabling medium speed operation, the exhaust efficiency of the exhaust fans 2 and 30 arranged in series can be improved reasonably.

In addition to the three exhaust modes described above, the range hood fans A and A2 described above can be used in any exhaust mode by changing the combination of the operation of both exhaust fans 2 and 3 (2, 30) and the moving position of the movable damper 5. May be set. For example, by operating only the main exhaust fan 2 and moving the movable damper 5 to the lower closed position 5b, the exhaust from the suction port 1b of the hood 1a and the upper suction port 7 is compared using the main exhaust fan 2. It can be done strongly. Further, the movable damper 5 is moved to an intermediate position between the intermediate closed position 5a and the lower closed position 5b, and the exhaust fans 2 and 3 (2, 30) are operated in this state, whereby the suction port 1b and the upper suction port 7 are moved. It can also be sucked and exhausted from both.
Further, in the above-described embodiment, several exhaust modes are set in the control unit 10 and an appropriate exhaust mode is selected according to the use situation. However, the range hood fan of the present invention is a dual exhaust fan 2. , 3 and the movement position of the movable damper 5 may be set by the user by directly operating the operation panel 10a so as to select an optimum operation mode according to the use situation. .
In addition, although the range hood fan A of the said Example is a center hood type | mold, this invention is not limited to this, It applies to the range hood fan of the form installed along the wall of a cooking chamber with a system kitchen. You can also.

The vertical side view which shows the range hood fan of this invention. II-II sectional view taken on the line in FIG. The longitudinal cross-sectional view which shows the range hood fan of the main exhaust mode state. The longitudinal cross-sectional view which shows the range hood fan of a top exhaust mode state. The longitudinal cross-sectional view which shows the range hood fan of an upper rapid exhaust mode state. The longitudinal cross-sectional view which shows the range hood fan which installed the sirocco-type fan as an upper exhaust fan. VI-VI sectional view taken on the line in FIG.

Explanation of symbols

A ... Range hood fan B ... Ceiling surface 1 ... Food body 1b ... Suction port 2 ... Main exhaust fan 2c ... Guide piece 3,30 ... Upper exhaust fan 4 .... -Exhaust duct 5 ... Movable damper 5a ... Middle closed position 5b ... Lower closed position 7 ... Upper suction port 8 ... Skirt member 9 ... Communication path 10 ... Control part

Claims (4)

The hood main body is provided with a hood body whose upper part is located near the ceiling of the room and a suction port is provided at the lower part. An upper exhaust fan is installed in the hood body, and the exhaust air drawn from the suction port at the lower part of the hood body is exhausted from the main exhaust fan to the outside through the exhaust duct. The upper suction port is opened at the upper part of the hood body. The upper exhaust fan is exposed to the vicinity of the intake port, and the exhaust side of the upper exhaust fan and the intake side of the main exhaust fan are communicated with each other via a communication path configured in the hood body. A movable damper is provided in the middle, and this movable damper closes the middle of the communication path to allow the hood main body suction port and the main exhaust fan to communicate with each other, and the main exhaust fan and the fan. De configured to selectively move between a lower closed position allowed to open the intermediate contact path brought closed between the main body suction port, actuates only the main exhaust fan, an intermediate closed position the movable damper The main exhaust mode to move to the upper exhaust mode, the upper exhaust mode to operate only the upper exhaust fan and move the movable damper to the lower closed position, the main exhaust fan and upper exhaust fan to operate together, and the movable damper to the lower closed position A range hood fan comprising a control mechanism for selectively controlling the upper rapid exhaust mode . The hood main body is provided with a hood body whose upper part is located near the ceiling of the room and a suction port is provided at the lower part. An upper exhaust fan is installed in the hood body, and the exhaust air drawn from the suction port at the lower part of the hood body is exhausted from the main exhaust fan to the outside through the exhaust duct. The upper suction port is opened at the upper part of the hood body. The upper exhaust fan is exposed to the vicinity of the intake port, and the exhaust side of the upper exhaust fan and the intake side of the main exhaust fan are communicated with each other via a communication path configured in the hood body. A movable damper is provided in the middle, and this movable damper closes the middle of the communication path to allow the hood main body suction port and the main exhaust fan to communicate with each other, and the main exhaust fan and the fan. It is configured to selectively move between a lower closed position that closes the main body suction port and opens the middle of the communication path, and the upper suction from the ceiling surface to the upper peripheral surface of the hood main body A range hood fan that is provided with a skirt member for exhaust introduction that inclines toward the mouth .   The range hood fan according to claim 1 or 2, wherein both the main exhaust fan and the upper exhaust fan are constituted by a centrifugal multiblade fan.   The range hood fan according to claim 1 or 2, wherein the main exhaust fan is constituted by a centrifugal multiblade fan, and the upper exhaust fan is constituted by a propeller fan.

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