Exhaust device

Abstract

To provide an exhaust device capable of securing air quantity required for exhausting steam or oily smoke generated during cooking in a commercial kitchen, improving a freedom degree of an installation space, facilitating maintenance, and preventing failure caused by high-temperature exhaust containing oily smoke, flame, or the like.SOLUTION: An exhaust device 100 includes an exhaust hood 10 installed in a kitchen room 50, and a fan unit 20 for discharging exhaust taken into the exhaust hood 10 to the outdoors. The fan unit 20 includes a casing 21, a multiblade fan including a multiblade impeller and a fan casing 222, and a motor 23 for rotating the impeller. The fan unit 20 is installed on an outer wall 43, and the exhaust hood 10 and a suction port 2221 of the fan unit 20 are connected by connecting means 30.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an exhaust device that is installed near a cooking appliance in a kitchen of a restaurant, hotel, hospital, or the like. [Background technology]

[0002] In kitchens (kitchen rooms), various exhaust systems are used to exhaust the steam and oily smoke generated during cooking. For example, in commercial kitchens, cooking is done using high heat, which generates a lot of steam and oily smoke. Therefore, the exhaust systems (exhaust hoods) used in commercial kitchens require a larger exhaust air volume than those used in residential kitchens. In a conventional ventilation system, large kitchens are equipped with multiple exhaust hoods, with multiple ducts connected to each exhaust hood, and large fans are used to exhaust the steam and oily smoke. Meanwhile, in small kitchens, such as those used in individual stores, fans are installed for each exhaust hood, and these fans exhaust the steam and oily smoke.

[0003] Patent Document 1 describes a kitchen exhaust system for exhausting steam, oily smoke, etc. generated from cooking heat sources in commercial kitchens. The kitchen exhaust system 20 described in Patent Document 1 has an exhaust hood 21 attached to the ceiling 4 above the cooking heat source, and a chamber 22 connected to an exhaust port corresponding to an exhaust duct 5 above the ceiling (Fig. 1). Furthermore, Patent Document 1 describes, as a conventional technique, a method of branching an exhaust duct 6' above the ceiling to increase the number of exhaust ports connected to the exhaust duct in order to accommodate a large intake air volume (Figure 4(b)). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Registered Utility Model No. 3226394 Summary of the Invention [Problem to be solved by the invention]

[0005] However, achieving a large exhaust air volume inevitably requires a larger fan (fan unit), which limits the installation location. In other words, due to space constraints, it may not be possible to install a larger fan unit inside an exhaust hood or above the kitchen ceiling. Also, as mentioned above, cooking in commercial kitchens uses high heat, so there is a risk that the high-temperature exhaust air containing steam and oily smoke will overheat the exhaust fan motor and cause it to break down.

[0006] The kitchen exhaust device described in Patent Document 1 can be used in commercial kitchens, but if one tries to achieve a large exhaust air volume, the exhaust device will have to be made larger, which limits the installation location.

[0007] Therefore, the present invention aims to provide an exhaust device that can ensure the air volume necessary to exhaust steam and oily smoke generated during cooking in commercial kitchens, that allows for greater freedom in installation location and is easy to maintain, and that can prevent breakdowns due to high-temperature exhaust containing oily smoke, flames, etc. [Means for solving the problem]

[0008] The exhaust device according to the present invention comprises: an exhaust hood installed in a kitchen; a fan unit that discharges the exhaust air drawn into the exhaust hood to the outdoors; An exhaust device comprising: A casing; a multi-blade fan provided within the casing, the multi-blade fan comprising a fan casing having a multi-blade impeller and an inlet port, the rotation of the impeller forming within the casing a flow path through which indoor exhaust air drawn in from the inlet port via an exhaust hood passes; a motor provided outside the fan casing and configured to rotate the impeller; and The fan unit is installed on an outer wall, and the exhaust hood and the suction port of the fan unit are connected by a connecting means.

[0009] With this configuration, the fan unit has a multi-blade fan, which ensures the air volume necessary to exhaust oil smoke from the kitchen, and because the fan unit is installed on the exterior wall (outdoors), it is possible to provide greater freedom in installation and facilitate maintenance.

[0010] The motor is provided on a surface of the fan casing facing the suction port in a state separated from the fan casing via a support member, The impeller is provided within the fan casing, The casing is provided with an outside air inlet through which outside air flows in, The fan casing has a vent hole on a surface opposite to the suction port, It is desirable that the outside air that flows into the casing through the outside air inlet passes around the motor and is drawn into the fan casing through the air vent.

[0011] In particular, it is desirable that the vent be provided within the projection area of ​​the motor when the fan casing is viewed from the front.

[0012] The exhaust device includes an openable / closable door provided with an outside air inlet and attached to the front of the casing; It is desirable that the door have a heat shielding plate provided on the door such that a space through which outside air can circulate is formed between the door and the casing.

[0013] Furthermore, the exhaust hood has a hood opening on its bottom surface and communicates with the fan unit; It is desirable that a plurality of straightening members be provided to close the hood opening so that exhaust intake ports are formed at the inner peripheral edge of the hood opening and in the gaps between the straightening members.

[0014] In this case, the exhaust hood has an exhaust opening in a wall surface that communicates with the fan unit, and is installed on a wall surface in the kitchen, It is more desirable that the exhaust opening, the suction port of the fan casing, and the impeller are arranged in a straight line. [Effects of the Invention]

[0015] According to the exhaust device of the present invention, with this configuration, (1-1) The fan unit can be installed on the exterior wall (outdoors) with a high degree of freedom, which is particularly suitable for low-rise, small-scale stores. (1-2) In addition, because the motor is located outside the fan casing, even if flames from the kitchen enter the exhaust hood, it is possible to prevent ignition of flammable parts (electrical wiring, etc.) inside the fan unit. At the same time, although high-temperature exhaust air containing oily smoke from the kitchen passes through the flow path formed by the fan casing, because the motor is located outside the fan casing, it is possible to prevent the motor from being exposed to the high-temperature exhaust air and breaking down. (1-3) Furthermore, since it is composed of a simple combination of an exhaust hood and a fan unit, and it is only necessary to assemble it so that the exhaust hood and the intake port of the fan unit are connected, it is easier to install than conventional exhaust devices (for example, exhaust devices composed of an exhaust hood and a pressurized fan). (1-4) In addition, because the fan unit is installed outdoors, maintenance of the multi-blade fan can be performed from outside by opening the casing. This eliminates the need to crawl into an exhaust hood during maintenance, as is the case with conventional exhaust systems, and also makes maintenance easier.

[0016] (2-1) Furthermore, since the motor is installed in a state where it is isolated from the fan casing via support members (blocking plate, partition plate), it is possible to prevent the heat of the fan casing, which becomes hot due to the passage of high-temperature exhaust gas containing oily smoke from the kitchen, from being transmitted to the motor. (2-2) Furthermore, the external air inlet and vent create an air current that passes around the motor, which reduces the temperature rise of the motor and prevents the motor from overheating and breaking down when the motor is operated continuously or when the temperature inside the casing rises due to sunlight in summer. (2-3) In addition, an air vent is provided on the surface opposite the intake port of the fan casing, but since outside air is drawn in through the outside air inlet and the air vent due to the attraction action caused by the operation of the fan unit, no complex configuration is required to form the airflow.

[0017] (3) In particular, if the vent is located within the projected area of ​​the motor when the fan casing is viewed from the front, the outside air that flows into the casing from the outside air inlet will hit the motor, pass around the motor, and then flow into the vent. As a result, a cooling airflow will be formed around the motor by the hitting outside air, enveloping the motor. Even if the temperature inside the casing becomes high, the motor will be cooled by this cooling airflow, preventing it from overheating and breaking down.

[0018] The exhaust device has an openable door and a heat shield, (4-1) A space is formed between the casing and the heat shield, and an exhaust layer of outside air is formed in the space. Therefore, even if the heat shield becomes hot due to sunlight, the temperature of the heat shield is prevented from being transferred to the casing and becoming too high inside the casing. (4-2) Furthermore, the heat shield can prevent rainwater from entering the casing through the outside air inlet during rainy weather. (4-3) Furthermore, by opening the door, workers can easily inspect, clean, and replace the multi-blade fan and motor inside the casing from outside during maintenance, and when installing the exhaust device (fan unit), they can easily check the wiring inside the casing and check its operation from outside, making it easy to maintain and install.

[0019] (5-1) Furthermore, by providing a straightening member, the flow rate of the exhaust air drawn into the exhaust intake port formed between the straightening member and the hood opening increases. This reduces the amount of airflow required to exhaust oily smoke from the kitchen, making it possible to reduce the operating frequency of the fan unit motor (reducing the number of rotations). (5-2) Furthermore, the straightening member blocks noise generated on the fan unit side, preventing the noise from being transmitted into the kitchen.

[0020] (6) In this case, by forming the flow path (exhaust flow path) for exhausting oil smoke from the kitchen room in a straight line with the exhaust opening, intake port, and impeller, the collision of exhaust gas within the exhaust hood and fan unit is reduced, thereby reducing pressure loss and ultimately the load on the motor. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a schematic configuration diagram of an exhaust device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of the exhaust hood shown in FIG. 1. [Figure 3] 2A and 2B are perspective views of the fan unit shown in FIG. 1, where (i) is a view with a door and (ii) is a view with the door removed. [Figure 4] FIG. 2(i) is a front view of the fan unit shown in FIG. 1, and FIG. 2(ii) is a rear view. [Figure 5] FIG. 2 is a right side view of the fan unit shown in FIG. [Figure 6] FIG. 2 is a bottom view of the fan unit shown in FIG. [Figure 7] FIG. 5 is a cross-sectional view of the fan unit shown in FIG. 4(i) taken along line AA with some parts omitted. [Figure 8] 8 is a cross-sectional view of the fan unit shown in FIG. 7, with a portion thereof cut away from the bottom of the drawing. [Figure 9] 8 is a cross-sectional view of the fan unit shown in FIG. 7, with a portion cut away from CC. [Figure 10] FIG. 8 is a cross-sectional view of the fan unit shown in FIG. 7, with a portion thereof omitted. [Figure 11] FIG. 8 is a view of the casing and fan casing of the fan unit shown in FIG. 7, with the door, motor, impeller, etc. removed. DETAILED DESCRIPTION OF THE INVENTION

[0022] An embodiment of the present invention will be described in detail below, but the description of the components described below is one example (typical example) of an embodiment of the exhaust system according to the present invention, and the present invention is not limited to the following content unless the gist of the present invention is changed. Furthermore, components having the same functions are given the same reference numerals in the drawings, and detailed description thereof will be omitted. For the sake of convenience in this explanation, the exhaust hood will be referred to as its front when viewed from indoors (inside the kitchen) (the rear is facing the inner wall of the kitchen), and the fan unit will be referred to as its front when viewed from outdoors (the rear is facing the outer wall).

[0023] [Exhaust system] First, an exhaust device 100 according to an embodiment of the present invention will be described with reference to FIG. The exhaust device 100 includes an exhaust hood 10 installed indoors (inside the kitchen room 50) and a fan unit 20 installed outdoors (on the exterior wall 43). The exhaust hood 10 and the fan unit 20 are connected via a duct 30, which is a connecting means.

[0024] [Exhaust hood] Next, with further reference to FIG. 2, an exhaust hood 10 according to an embodiment of the present invention will be described. The exhaust hood 10 is installed with its back surface in contact with the inner wall 41 of the kitchen room 50. In this embodiment, the exhaust hood 10 is installed in a corner portion formed by the inner wall 41 and the ceiling 42 with its back surface in contact with the inner wall 41 and its top surface in contact with the ceiling 42 (see FIG. 2).

[0025] The exhaust hood 10 also has a hood opening 11 on its bottom surface, and two rectifying members 12, each slightly smaller than the hood opening 11, are installed at a distance from each other in the hood opening 11. This configuration forms an exhaust inlet 13 at the inner peripheral edge 11R of the hood opening 11 and in the gap between the rectifying members 12. The exhaust hood 10 also has an exhaust opening 14 on its surface (back surface) that contacts the inner wall 41, and a flame transmission prevention device 16 is provided near the exhaust opening 14. The flame transmission prevention device 16 has multiple blades (not shown) that close the flow path in the event of a fire; these blades are normally open. When heat from a flame or other source that has entered the exhaust hood 10 is detected, the multiple blades are instantly closed to close the exhaust opening 14 and prevent the fire from spreading. Furthermore, a chamber 15 is provided inside the exhaust hood 10 to cover the exhaust opening 14, and a grease filter (not shown) is provided on the inclined surface 15a of the chamber 15 to remove oil contained in the oily smoke (see Figure 1). As mentioned above, in this embodiment, two straightening members 12 are installed, but the number of straightening members 12 may be increased or decreased (to one or three or more) depending on the conditions in the kitchen room and the size of the exhaust hood, or no straightening members 12 may be installed.

[0026] Exhaust hood 10 then sucks in exhaust such as smoke and steam generated during cooking using cooking appliance 51 through exhaust inlet 13. More specifically, exhaust is sucked in through exhaust inlet 13 by operating fan unit 20 connected to exhaust hood 10, which will be described later. The exhaust air drawn in through the exhaust inlet 13 passes through a grease filter to remove oil, and is then discharged from the exhaust opening 14 through the duct 30 and the fan unit 20 to the outdoors.

[0027] The exhaust hood 10 is formed by assembling flat plate-like members in a factory to form a rectangular hood with an open bottom, to which components such as a chamber 15 having a grease filter and a flame transmission prevention device 16 are assembled. The exhaust hood 10 may also be configured to be assembled on-site (in the kitchen 50). For example, if workers transport the rectangular hood and components such as the chamber 15 and the flame transmission prevention device 16 to the site and assemble them on-site, the transportation costs for the exhaust hood 10 can be reduced.

[0028] [Fan unit] Next, the fan unit 20 according to the embodiment of the present invention will be described with further reference to FIGS. The fan unit 20 has a casing 21, a multi-blade fan 22, and a motor 23 (see Figure 7), and is installed on the outer wall 43 while connected to the exhaust opening 14 of the exhaust hood 10 via a duct 30, and discharges the exhaust air EX sucked in by the exhaust hood 10 outdoors.

[0029] [Casing] The casing 21 is a rectangular box body, and has an openable and closable door (front panel) 27 attached to the front. An outside air inlet 211 for allowing outside air OA to flow into the fan unit 20 is provided in the center of the door 27.

[0030] Here, a heat shield plate 28 is provided on the front surface of the casing 21 (door 27 in this embodiment) (see FIGS. 3(i), 4(i), 6 and 7). The heat shield 28 is spaced apart from the door 27 to form a space G. In addition, slits Gs are provided around the entire periphery of the door 27 and the heat shield 28, serving as inlets for the outside air OA to flow into the space G (see FIGS. 5, 6, and 7).

[0031] A rainwater intrusion prevention member 29 is provided in the space G formed by the door 27 and the heat shield 28. In this embodiment, the rainwater intrusion prevention member 29 is shade-shaped and provided near and above the outside air inlet 211, but the shape and the location of the rainwater intrusion prevention member 29 are not limited to this (see FIG. 8).

[0032] Furthermore, the bottom surface of the casing 21 is provided with an exhaust port 212 for discharging the exhaust air EX to the outdoors, and an oil outlet 213 for discharging oil contained in the exhaust air EX (see Figures 6 and 10). The oil contained in the exhaust air EX is removed on the exhaust hood 10 side by passing through a grease filter, but the exhaust air EX sent to the fan unit 20 side may contain some oil that has not been completely removed. Therefore, a space S1 is formed within the casing 21 by the back surface of the casing 21, the back surface 222b of the fan casing 222, and the guide 214, and an oil discharge port 213 is provided at the bottom of the space S1 (see FIGS. 6, 7, 10, and 11). When the exhaust air EX is sucked in through the suction port 2221 of the multi-blade fan 22 and passes through the space S1, a vortex is formed in the space S1, and a portion of the exhaust air EX is drawn into the space S1 by the vortex. At that time, the exhaust air EX collides with the back surface of the casing 21, the back surface 222b of the fan casing 222, and the guide 214 in the space S1. Therefore, the oil contained in the exhaust air EX adheres to these surfaces upon collision. The oil droplets that have adhered then flow by gravity toward the oil discharge port 213 and are discharged from the oil discharge port 213 to the outdoors (outside the fan unit 20).

[0033] [Multi-blade fan] On the other hand, the multi-blade fan 22 is provided inside the casing 21, and is a sirocco fan made up of a multi-blade impeller 221 and a fan casing 222 (see FIG. 7).

[0034] The fan casing 222 has an intake port 2221 for drawing in exhaust air EX sent from the exhaust hood 10 via the duct 30. The intake port 2221 is provided on the back surface 222b of the fan casing 222, within the casing 21 via a space S1 (see FIGS. 4(ii), 5, 6, 7, and 11). The fan casing 222 also has an opening 2222 on the front surface 222f for attaching and detaching the impeller 221 and the motor 23 to and from the fan casing 222 (see FIG. 11). Furthermore, a discharge port 2223 is provided on the bottom surface of the fan casing 222, at a position opposite the exhaust port 212 (see FIGS. 3(ii) and 9).

[0035] [motor] On the other hand, the motor 23 is provided on the front surface 222f side of the fan casing 222, and the impeller 221 and a rotary shaft of the motor 23 are coupled to rotate the impeller 221. The motor 23 is provided in an area S2 surrounded (partitioned) by a partition plate 25, separated from the front surface 222f of the fan casing 222 by a support member 24 provided on a blocking plate 26 (see FIGS. 3(ii), 7, and 9). In this embodiment, the area S2 is formed in a quadrangular shape when the fan unit 20 is viewed from the front, and the motor 23 is housed in the area S2 (see FIG. 3(ii)). With this configuration, the motor 23 does not come into direct contact with the fan casing 222, and therefore, the sound generated by the motor 23 can be prevented from being transmitted into the kitchen room 50 through the fan casing 222.

[0036] In this embodiment, motor 23 is a DC motor, and operation start / stop switching and rotation speed adjustment can be performed remotely using a switch provided in kitchen room 50. Therefore, if a large amount of exhaust gas EX is generated during cooking using cooking appliance 51, the rotation speed of motor 23 can be increased to increase the rotation speed of impeller 221, thereby increasing the airflow rate of multi-blade fan 22.

[0037] In this embodiment, the closure plate 26 is fixed to partially block the opening 2222 of the fan casing 222, and outside air OA flows into the fan casing 222 through the ventilation hole 261 of the closure plate 26. The partition plate 25 is fixed to the closure plate 26 by means of screws, welding, or the like (see FIGS. 7, 9, and 11).

[0038] In this embodiment, the vent hole 261 is provided on the closure plate 26 and within the projection area of ​​the motor 23 when the fan casing 222 is viewed from the front (FIG. 3(ii)) (see FIGS. 7 and 9). The shape, size, number, etc. of the vent hole 261 can be arbitrarily changed in design, but in this embodiment, a circular vent hole 261 is provided on the closure plate 26.

[0039] In this embodiment, the exhaust opening 14 of the exhaust hood 10, the intake port 2221 of the fan casing 222 of the fan unit 20, and the impeller 221 are arranged on the same straight line (see FIGS. 1 and 7). With this configuration, it is possible to form a straight flow path with few curves for discharging exhaust gas EX generated during cooking using cooking device 51. Note that, as long as exhaust opening 14 is provided so as to be continuous with space S1, exhaust opening 14 does not have to be arranged in the same straight line as intake port 222 and impeller 221.

[0040] Additionally, in this embodiment, the motor 23 to which the impeller 221 is attached, the support member 24, and the partition plate 25 are fixed to the closure plate 26 to be integrated, and these are configured to be detachable from the fan casing 222 (see FIG. 11). The closure plate 26 and the front surface 222f of the fan casing 222 are configured to be engageable with each other. Furthermore, although the end of the duct 30 may protrude slightly into the space S1 depending on the installation conditions, the space S1 is provided in the fan unit 20, and this can serve as an escape route for the protruding end of the duct 30. Therefore, the end of the duct 30 does not interfere with the fan casing 222, and installation is not hindered.

[0041] Specifically, in this embodiment, the closure plate 26 and the front surface 222f of the fan casing 222 are locked together by a locking portion 222L (see FIG. 3(ii) and FIG. 9). The locking portion 222L is made up of a locking plate (not shown) that protrudes from the front surface 222f of the fan casing 222 and a locking hole (not shown) that is provided in the closure plate 26. Then, the worker inserts the locking plate into the locking hole to lock the closure plate 26, and then fixes the closure plate 26 to the front surface 222f of the fan casing 222 with screws. With this configuration, the closure plate 26, which integrates the heavy motor 23, impeller 221, etc., can be easily fixed to the front surface 222f of the fan casing 222.

[0042] [Example of exhaust system operation] Finally, the operation of the exhaust device 100 according to the embodiment of the present invention will be described with reference to FIGS.

[0043] The exhaust air EX generated during cooking using a cooking appliance 51 in the kitchen room 50 is sucked in through the exhaust intake port 13 of the exhaust hood 10, passes through a grease filter, and is guided from the exhaust opening 14 through the duct 30 to the fan unit 20 side (see Figures 1 and 2).

[0044] The exhaust air EX guided toward the fan unit 20 is sucked into the fan casing 222 by the multi-blade fan 22 through the intake port 2221 provided in the fan casing 222, passing through the space S1, and then, as the impeller 221 rotates, the exhaust air is discharged from the discharge port 2223 of the fan casing 222 and then from the exhaust port 212 to the outdoors (see Figures 3(ii), 7, and 9).

[0045] Meanwhile, because the door 27 of the casing 21 of the fan unit 20 is provided with the outside air inlet 211, even when the door 27 is closed (see FIG. 3(i)), the outside air OA passes through the space G, the outside air inlet 211, and the area S2, and is drawn into the fan casing 222 through the ventilation opening 261. Then, the outside air OA is discharged to the outdoors together with the exhaust air EX through the exhaust opening 212 (see FIGS. 7, 8, and 9).

[0046] Here, the outside air OA flows into area S2 from outside air inlet 211 and is then discharged to the outdoors from exhaust port 212, but the outside air OA that flows into area S2 passes around the motor 23 while colliding with the motor 23. In particular, since the air vent 261 is provided within the projection area of ​​the motor 23 when the fan casing 222 is viewed from the front, the outside air OA that flows in from outside air inlet 211 inevitably passes around the motor 23 while colliding with the motor 23 before reaching the air vent 261.

[0047] Therefore, a cooling air current is formed around the motor 23 by the colliding outside air OA, enveloping the motor 23. Therefore, even if the temperature inside the casing 21 becomes high due to operating the motor 23 for a long time or strong sunlight, the cooling air current reduces the temperature inside the region S2 and cools the motor 23, preventing the motor 23 from overheating and breaking down.

[0048] Furthermore, since the outside air OA is drawn in from the outside air inlet 211 and the vent 261 by the induction effect caused by the operation of the fan unit 20, a complex configuration for forming the cooling airflow is not required.

[0049] In this way, the exhaust device 100 allows the fan unit 20 to be installed outdoors (on the exterior wall 43), so there are no restrictions on the installation location, and it can also deal with problems caused by the outdoor environment, such as sunlight and rain, that arise when the fan unit 20 is installed outdoors. In addition, the exhaust device 100 is constructed from a simple combination of an exhaust hood 10 and a fan unit 20, and can be assembled so that the exhaust opening 14 of the exhaust hood 10 and the intake port 2221 of the fan unit 20 are connected by a duct 30, making it easier to install than conventional exhaust devices.

[0050] Furthermore, because fan unit 20 is installed outdoors (on outer wall 43), there is a risk that rainwater may enter casing 21 through outside air inlet 211 during rainy weather. By providing heat shield 28 in front of door 27 (outside air inlet 211), it is possible to prevent the temperature inside casing 21 from rising and also to prevent rainwater from entering from the front side of fan unit 20. Furthermore, by providing the rainwater intrusion prevention member 29, rainwater can be reliably prevented from infiltrating into the outside air inlet 211 from the space G (particularly the slits Gs on the top and side surfaces of the fan unit 20).

[0051] The exhaust device 100 described above is one example of an embodiment of the exhaust device according to the present invention, and the present invention is not limited to these configurations as long as the gist of the present invention is not changed. For example, the positions, sizes, shapes, numbers, etc. of the exhaust ports 212 and oil discharge ports 213 provided in the casing 21 of the fan unit 20 can be modified as appropriate.

[0052] In addition, in this embodiment, the exhaust opening 14 of the exhaust hood 10 and the intake port 2221 of the fan unit 20 are connected by the duct 30, but they (the exhaust opening 14 of the exhaust hood 10 and the intake port 2221 of the fan unit 20) may also be directly connected across a wall. [Industrial Applicability]

[0053] The exhaust device according to the present invention can be used as an exhaust device constituting a ventilation system installed near a cooking appliance in a wide variety of kitchens in restaurants, hotels, hospitals, and the like, and is therefore industrially useful. [Explanation of symbols]

[0054] 10 Exhaust hood 11 Hood opening 11R inner periphery 12 Straightening member 13 Exhaust intake 14 Exhaust opening 15 Chamber 15a Chamber inclined surface 16 Flame transmission prevention device 20 fan units 21 Casing 211 Outside air inlet 212 Exhaust port 213 Oil drain port 214 Guide 22 Multi-blade fan 221 Impeller 222 Fan casing 222f Front of fan casing 222b Back of fan casing 222L Locking part 2221 Intake port 2222 Aperture 2223 Discharge port 23 Motor 24 Support member 25 Divider 26 Occlusion plate 261 Ventilation 27 Door 28 Heat shield 29 Rainwater intrusion prevention material 30 Duct 41 Inner wall 42 Ceiling 43 Exterior Wall 50 Kitchen room 51 Heating cooker 100 Exhaust system S1 Space formed by guides, etc. S2 Area separated by a partition G Space formed between the door and the heat shield Gs slit EX exhaust OA Outside air

Claims

1. An exhaust hood installed in the kitchen, a fan unit that discharges the exhaust air drawn into the exhaust hood to the outdoors; An exhaust device comprising: A casing; a multi-blade fan provided within the casing, the multi-blade fan comprising a fan casing having a multi-blade impeller and an inlet port, the rotation of the impeller forming within the casing a flow path through which indoor exhaust air sucked in from the inlet port via an exhaust hood passes; a motor provided outside the fan casing and configured to rotate the impeller; and The exhaust device has the fan unit installed on an exterior wall, and the exhaust hood and the suction port of the fan unit connected by a connecting means.

2. the motor is provided on a surface of the fan casing facing the suction port in a state separated from the fan casing via a support member, The impeller is provided within the fan casing, The casing is provided with an outside air inlet through which outside air flows in, The fan casing has a vent hole on a surface opposite to the suction port, 2. The exhaust device according to claim 1, wherein outside air that flows into the casing through the outside air inlet passes around the motor and is drawn into the fan casing through the vent.

3. The exhaust device according to claim 2 , wherein the vent is provided within a projection area of ​​the motor when the fan casing is viewed from the front.

4. an openable door provided with an outside air inlet and attached to the front surface of the casing; The exhaust system according to claim 1 , further comprising: a heat shield provided on the door, the heat shield being provided so as to form a space between the door and the casing through which outside air flows.

5. the exhaust hood has a hood opening on its bottom surface and communicates with the fan unit; 5. The exhaust device according to claim 1, wherein a plurality of straightening members are provided to close the hood opening so that exhaust intake ports are formed at inner peripheral edges of the hood opening and in gaps between the straightening members.

6. the exhaust hood has an exhaust opening in a wall surface that communicates with the fan unit, and is installed on a wall surface within the kitchen; 6. The exhaust device according to claim 5, wherein the exhaust opening, the inlet of the fan casing, and the impeller are arranged on a straight line.

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