Ventilation device, ventilation system

Abstract

To prevent dew formation in a ventilation device when ventilating a room.SOLUTION: A ventilation device (10) takes in ambient air and discharges air from inside a room simultaneously. The ventilation device is equipped with a hood (12) formed with a suction port (18) for sucking air from inside the room, a first cover (21) for covering a side wall of the hood from outside with a gap, and a second cover (26) for covering the first cover from outside with a gap. The outside of the suction port is formed with an air outlet (23) for blowing ambient air inside the room from the gap between the side wall of the hood and the first cover. The outside of the air outlet is formed with an outside suction port (28) for sucking air to the gap between the first cover and the second cover from inside the room.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a ventilation device and a ventilation system for ventilating a room.

Background Art

[0002] In a room such as a kitchen, a simultaneous supply and exhaust type ventilation device that performs supply and exhaust simultaneously may be installed. As this type of ventilation device, there is known one in which a cover is provided so as to surround a box-shaped hood, and an air outlet is formed around the suction port of the hood (see, for example, Patent Document 1). An exhaust fan is provided in the exhaust passage connected to the suction port, and an air supply fan is provided in the air supply passage connected to the air outlet. When the ventilation device is in operation, the exhaust fan is driven to suck the dirty air in the room from the suction port, and at the same time, the air supply fan is driven to blow the outside air into the room from the air outlet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the ventilation device described in Patent Document 1, when low-temperature outside air is introduced into the room from the air outlet, there is a problem that dew condensation occurs because the surface of the cover becomes below the dew point temperature of the room.

[0005] The present invention has been made in view of this point, and an object thereof is to provide a ventilation device and a ventilation system capable of preventing the occurrence of dew condensation during ventilation of a room.

Means for Solving the Problems

[0006] The ventilation device according to one aspect of the present invention is a ventilation device that takes in outside air and at the same time discharges air from the room. The ventilation device includes a hood formed with a suction port for sucking air from the room, a first cover that covers the side wall of the hood from the outside with a gap, and a second cover that covers the first cover from the outside with a gap. An air outlet for blowing outside air into the room is formed outside the suction port from the gap between the side wall of the hood and the first cover, and an outer suction port for sucking air from the room into the gap between the first cover and the second cover is formed outside the air outlet.

Effects of the Invention

[0007] In the ventilation device according to one aspect of the present invention, an air outlet is positioned outside the suction port, and an outer suction port is positioned outside the air outlet. Air in the room is sucked into the inside of the hood from the suction port, outside air is blown into the room from the air outlet, and air in the room is sucked into the inside of the second cover from the outer suction port. Outside air taken in from the outside flows in the gap between the side wall of the hood and the first cover, and air in the room sucked in from the outer suction port flows in the gap between the first cover and the second cover. At this time, even if the outside air inside the first cover is below the dew point temperature, air in the room flows outside the first cover and the surface temperature of the first cover is maintained higher than the dew point temperature, thereby preventing condensation.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Best Mode for Carrying Out the Invention

[0009] In a commercial kitchen, a simultaneous supply and exhaust type commercial range hood (hereinafter referred to as a range hood) is installed to discharge fumes, odors, etc. generated during cooking and take in outside air from the outside. The exhaust volume of a commercial kitchen is large, and an air supply volume corresponding to this exhaust volume is required in the commercial kitchen. By supplying outside air after temperature and humidity adjustment to the commercial kitchen, the indoor environment is stabilized. However, together with fumes, odors, etc., the outside air after temperature and humidity adjustment is also exhausted from the commercial kitchen, resulting in waste of energy costs for temperature and humidity adjustment. For this reason, in a commercial kitchen, a range hood with a double-wall structure that is less likely to affect the indoor environment may be used even when supplying raw outside air without temperature and humidity adjustment.

[0010] As in the comparative example shown in FIG. 7, the range hood 61 with a double-wall structure has a cover 64 provided with a gap in the side wall 63 of the box-shaped hood 62. On the lower surface of the range hood 61, a suction port 65 for sucking indoor air into the inside of the hood 62 is formed, and a blowout port 66 for blowing outside air into the room is formed from the gap between the side wall 63 of the hood 62 and the cover 64. In the range hood 61 with a double-wall structure, raw outside air is blown downward from the blowout port 66, and at the same time, raw outside air is sucked in from the suction port 65 together with fumes, odors, etc. Even when raw outside air is blown out from the blowout port 66, it is difficult for the raw outside air to diffuse into the commercial kitchen, and changes in the indoor environment are suppressed.

[0011] Incidentally, generally, in order to avoid high temperature and high humidity in the indoor temperature and humidity conditions of a commercial kitchen from the viewpoints of hygiene and work efficiency, for example, it is set to a temperature of 25°C or lower and a humidity of 80% or lower. When cold fresh outdoor air is supplied by the range hood 61, the cold fresh outdoor air may flow through the gap between the side wall 63 of the hood 62 and the cover 64, and the surface temperature of the cover 64 may drop below the dew point temperature (21.5°C), resulting in condensation. Condensation is a factor for the growth of mold and various bacteria, which is not preferable in terms of food hygiene in a commercial kitchen. Therefore, in the ventilation system 1 of the present embodiment, a range hood 10 with a triple-wall structure is used, which is less likely to affect the indoor environment even when fresh outdoor air is supplied and further suppresses the occurrence of condensation (see Fig. 1).

[0012] Hereinafter, the present embodiment will be described in detail with reference to the accompanying drawings. Fig. 1 is a schematic diagram of the ventilation system of the present embodiment. Fig. 2 is a perspective view of the range hood of the present embodiment. In the following embodiments, an example of installing a range hood as a ventilation device in a commercial kitchen will be described. The front side of the paper in Fig. 1 is defined as the front side of the range hood, and the left and right directions are described based on the direction of viewing the range hood from the front.

[0013] As shown in Fig. 1, a ventilation system 1 equipped with a range hood 10 having a triple-wall structure is introduced into the commercial kitchen. The range hood 10 of the ventilation system 1 is installed on the ceiling 2, and the exhaust duct 31 and the supply duct 35 of the ventilation system 1 are arranged in the ceiling space 3. A cooking table (gas generation source) 5 is installed on the floor surface 4, and the range hood 10 is positioned above the cooking table 5. Outdoor air is supplied from the range hood 10 toward the cooking table 5 through the supply duct 35, and the indoor air containing oil fumes and the like generated on the cooking table 5 is sucked into the range hood 10 and discharged outdoors through the exhaust duct 31.

[0014] As shown in FIGS. 1 and 2, the left and right wall portions of the range hood 10 are formed into a triple-wall structure by the side walls 13 of the box-shaped hood 12 and the first and second covers 21 and 26. The left and right side walls 13 of the hood 12 are long in the front-rear direction (the direction perpendicular to the plane of FIG. 1), and the front and rear side walls 14 of the hood 12 are short in the left-right direction. A plurality of grease filters 15 are attached inside the hood 12 in an inclined state so as to cover the corners of the upper wall 11 and the left and right side walls 13 of the range hood 10. An exhaust port 16 is opened in the upper wall 11 covered by the plurality of grease filters 15, and oil and moisture in the air heading toward the exhaust port 16 are collected by each grease filter 15.

[0015] The lower ends of the left and right side walls 13 are folded inward to form a tray 17 having a U-shaped cross section in a perspective view. The left and right trays 17 are located below the plurality of grease filters 15, and oil and water droplets dripping from each grease filter 15 are received by the left and right trays 17. An intake port 18 is formed on the lower surface of the range hood 10 by the lower edges of the left and right trays 17 and the front and rear side walls 14. The intake port 18 of the hood 12 is opened downward, and the intake port 18 is positioned directly above the cooking appliance 6 on the cooking table 5. Air containing oil fumes and the like generated during cooking is directly sucked into the intake port 18 from the room.

[0016] A pair of first covers 21 are attached to the outside of the left and right side walls 13 of the hood 12, and the left and right side walls 13 are covered with a gap by the pair of first covers 21 from the outside. An air supply port 22 is opened on the upper wall 11 of the range hood 10 between the left and right side walls 13 and the pair of first covers 21. A blowout port 23 is formed on the lower surface of the range hood 10 outside the intake port 18 by the left and right side walls 13 and the pair of first covers 21. In this way, an air supply flow path for flowing outside air from the air supply port 22 toward the blowout port 23 is formed in the gap between the left and right side walls 13 and the first cover 21 inside the range hood 10.

[0017] A pair of second covers 26 are attached to the outside of the pair of first covers 21, and the pair of first covers 21 are covered with a gap from the outside by the pair of second covers 26. An exhaust port 27 is opened between the pair of first covers 21 and the pair of second covers 26 on the upper wall 11 of the range hood 10. On the lower surface of the range hood 10, an outside suction port 28 is formed outside the air outlet 23 by the pair of first covers 21 and the pair of second covers 26. In this way, an exhaust flow path for flowing indoor air from the outside suction port 28 toward the exhaust port 27 is formed in the gap between the first cover 21 and the second cover 26 inside the range hood 10.

[0018] The air outlet 23 is opened downward, and outside air is blown into the room from the gap between the side wall 13 of the hood 12 and the first cover 21 by the air outlet 23. The outside suction port 28 is opened downward, and air is sucked from the room into the gap between the first cover 21 and the second cover 26 by the outside suction port 28. The air outlet 23 is provided with a blowing louver 24 that can change the blowing angle in the inside-outside direction, and the outside suction port 28 is provided with a suction louver 29 that can change the suction angle in the front-rear direction (a direction perpendicular to the inside-outside direction). Here, the blowing angle of the blowing louver 24 is adjusted so that the blowing direction of the air outlet 23 faces the cooking hearth 7 on the cooking table 5. Further, the suction angle of the suction louver 29 is adjusted in a direction different from that of the blowing louver 24 so that the suction direction of the outside suction port 28 does not cause a short circuit.

[0019] As described above, an exhaust duct 31 and an air supply duct 35 are arranged in the ceiling space 3. The exhaust duct 31 guides the air sucked into the range hood 10 to the outside of the house, and the air supply duct 35 guides the outside air taken in from the outside of the house to the range hood 10. The exhaust duct 31 is provided with a first exhaust duct 32 that is the main duct and a second exhaust duct 33 that is a branch duct. The first exhaust duct 32 extends from the exhaust port 16 inside the hood 12 to the outside of the house, and the second exhaust duct 33 extends from the exhaust port 27 outside the hood 12 and is connected to the first exhaust duct 32. The air supply duct 35 extends from the air supply port 22 outside the hood 12 to the outside of the house.

[0020] The suction port 18 is connected to the first exhaust duct 32 through the inside of the hood 12. The outer suction port 28 is connected to the second exhaust duct 33 through the gap between the first cover 21 and the second cover 26. The air outlet 23 is connected to the air supply duct 35 through the gap between the side wall 13 of the hood 12 and the first cover 21. By connecting the suction port 18 and the outer suction port 28 to the same exhaust duct 31, the exhaust system of the ventilation system 1 is simplified. An exhaust fan 34 is provided in the exhaust duct 31, and an air supply fan 36 is provided in the air supply duct 35. The driving amounts of the exhaust fan 34 and the air supply fan 36 are controlled according to the required room pressure and the like in the commercial kitchen.

[0021] In this range hood 10, the suction port 18 is positioned directly above the cooking table 5, and the blowing direction of the air outlet 23 is directed toward the periphery of the cooking table 5. Outside air is blown out from the air outlet 23 toward the periphery of the cooking table 5, and the suction port 18 sucks in the oil fumes and the like generated at the cooking table 5 together with the indoor air. The diffusion of the outside air from the air outlet 23 into the room is prevented, and the diffusion of the oil fumes and the like into the room due to the downdraft of the outside air is prevented. Therefore, effective ventilation is performed while suppressing the influence on the indoor temperature and humidity conditions. Further, the dew condensation of the first cover 21 is suppressed by sucking the indoor air from the outer suction port 28.

[0022] Referring to FIG. 3, the dew condensation suppression structure of the range hood will be described. FIG. 3 is a schematic peripheral view of the range hood of the present embodiment.

[0023] As shown in Fig. 3, when cold outside air enters from the air supply duct 35 into the inside of the first cover 21, the cold outside air flows toward the air outlet 23 through the gap between the first cover 21 and the side wall 13 of the hood 12. As the cold outside air flows along the inner wall surface of the first cover 21, the first cover 21 is cooled. On the other hand, indoor air enters from the outside suction port 28 into the inside of the second cover 26, and the air flows toward the second exhaust duct 33 through the gap between the second cover 26 and the first cover 21. Since the room temperature is kept higher than the dew point temperature of the outside air, the surface temperature of the first cover 21 is maintained higher than the dew point temperature as the room temperature air flows along the outer wall surface of the first cover 21.

[0024] More specifically, as the room temperature air flows along the outer wall surface of the first cover 21, the surface heat transfer coefficient of the outer wall surface of the first cover 21 becomes higher compared to the case where there is no air flow. As a result, the heat of the indoor air is easily transferred to the outer wall surface of the first cover 21. Even when cold air flows along the inner wall surface of the first cover 21, the surface temperature of the first cover 21 becomes higher than the dew point temperature, suppressing the occurrence of condensation. Also, since the surface air flow of the first cover 21 secures the discharge of a part of the indoor air, the occurrence of condensation in the range hood 10 can be suppressed with a simple structure.

[0025] As described above, according to the present embodiment, the air outlet 23 is positioned outside the suction port 18, and the outside suction port 28 is positioned outside the air outlet 23. Indoor air is sucked into the inside of the hood 12 from the suction port 18, outside air is blown into the room from the air outlet 23, and indoor air is sucked into the inside of the second cover 26 from the outside suction port 28. The outside air taken in from the outside flows through the gap between the side wall 13 of the hood 12 and the first cover 21, and the indoor air sucked in from the outside suction port 28 flows through the gap between the first cover 21 and the second cover 26. At this time, even if the outside air inside the first cover 21 is below the dew point temperature, condensation is prevented because the indoor air flows outside the first cover 21 and the surface temperature of the first cover 21 is maintained higher than the dew point temperature.

[0026] In addition, in this embodiment, the blowing louvers are formed such that the blowing angle can be changed in the inner and outer directions, and the suction louvers are formed such that the suction angle can be changed in the front and rear directions. However, as long as a short circuit does not occur between the blowing outlet and the outer suction port, the direction in which the blowing louvers and the suction louvers can be tilted is not particularly limited. For example, even if the blowing louvers are formed such that the blowing angle can be changed in the inner and outer directions and the suction louvers are formed such that the suction angle can be changed in the inner and outer directions, it is sufficient that the blowing louvers are adjusted to a blowing angle such that they tilt downward toward the inside and the suction louvers are adjusted to a suction angle such that they tilt downward toward the outside. Also, the inclination of the blowing louvers and the suction louvers may be fixed.

[0027] Further, if the blowing direction of the blowing outlet and the suction direction of the outer suction port intersect, the blowing louvers and the suction louvers may not be provided. For example, as shown in Modification Example 1 of FIG. 4, the blowing outlet 42 of the range hood 41 may open downward, and the outer suction port 43 of the range hood 41 may open laterally. Even with such a configuration, it is possible to suppress a short circuit of the flow of outside air from the blowing outlet 42 to the outer suction port 43 due to the difference in the opening directions of the blowing outlet 42 and the outer suction port 43.

[0028] Also, the blowing direction of the blowing outlet and the suction direction of the outer suction port may not intersect. For example, as shown in Modification Example 2 of FIG. 5, the blowing outlet 46 of the range hood 45 may open downward, and the outer suction port 47 may open downward at a position higher than the blowing outlet 46. Even with such a configuration, it is possible to suppress a short circuit of the flow of outside air from the blowing outlet 46 to the outer suction port 47 by separating the blowing outlet 46 and the outer suction port 47 in the height direction.

[0029] In addition, in this embodiment, the ventilation system is configured to always suck indoor air from the outside air inlet during operation, but the suction of air from the outside air inlet may be stopped according to the temperature of the outside air. For example, as shown in Modification 3 of FIG. 6, in the ventilation system 51, a temperature sensor 55 is provided in the middle of the supply duct 53, and a damper 56 is provided in the middle of the second exhaust duct 54. The temperature of the outside air taken in from the outside is detected by the temperature sensor 55, and when the detected temperature of the temperature sensor 55 is higher than the dew point temperature of the room, the damper 56 restricts the suction of air from the outside air inlet 59 of the range hood 52. When condensation is unlikely to occur, the suction of air from the outside air inlet 59 is restricted, and the suction amount of air from the suction port 57 of the range hood 52 can be increased.

[0030] In addition, in this embodiment, one exhaust duct is provided in the ventilation system, but a plurality of exhaust ducts may be provided in the ventilation system. For example, the suction port and the outside air inlet may be connected to separate exhaust ducts. In this case, an exhaust fan is provided for each system, and when the outside air is higher than the dew point temperature, the driving of the exhaust fan that sends outside air to the outside air inlet can also be stopped.

[0031] In addition, in this embodiment, a range hood installed in a commercial kitchen is illustrated and described as the ventilation device, but the ventilation device is not limited to the range hood. The ventilation device may be any device used for indoor ventilation that generates gases such as water vapor, volatile gases, and odors, in addition to oil fumes. That is, the gas generation source is not limited to the cooking table in the commercial kitchen, and includes manufacturing devices installed on the production line of a factory, etc.

[0032] In addition, in this embodiment, the hood is formed in a box shape, but the shape of the hood is not particularly limited. It is sufficient that at least a suction port is formed in the hood.

[0033] In addition, in this embodiment, a grease filter is installed in the hood, but a small grease filter may also be installed in the gap between the first and second covers.

[0034] In addition, in this embodiment, the first and second covers are provided so as to cover the left and right side walls of the hood, but the first and second covers may be provided so as to cover the front and rear side walls of the hood. That is, the first and second covers may be provided so as to surround the four side walls of the hood from all four sides.

[0035] As described above, the ventilation device (range hood 10) of this embodiment is a ventilation device that takes in outside air and at the same time discharges air from the room. It includes a hood (12) in which a suction port (18) for sucking air from the room is formed, a first cover (21) that covers the side wall of the hood from the outside with a gap, and a second cover (26) that covers the first cover from the outside with a gap. An air outlet (23) for blowing outside air into the room is formed from the gap between the side wall of the hood and the first cover outside the suction port, and an outer suction port (28) for sucking air from the room into the gap between the first cover and the second cover is formed outside the air outlet. According to this configuration, the air outlet is positioned outside the suction port, and the outer suction port is positioned outside the air outlet. Air in the room is sucked into the inside of the hood from the suction port, outside air is blown into the room from the air outlet, and air in the room is sucked into the inside of the second cover from the outer suction port. Outside air taken in from the outside flows in the gap between the side wall of the hood and the first cover, and air in the room sucked in from the outer suction port flows in the gap between the first cover and the second cover. At this time, even if the outside air inside the first cover is below the dew point temperature, air in the room flows outside the first cover and the surface temperature of the first cover is maintained higher than the dew point temperature, thus preventing condensation.

[0036] In the ventilation device of this embodiment, the blowing direction of the air outlet and the suction direction of the outer suction port intersect. According to this configuration, a short circuit of the flow of outside air from the air outlet to the outer suction port can be suppressed.

[0037] In the ventilation device of this embodiment, the air outlet and the outer air inlet are opened downward, the air outlet is provided with an air outlet louver (24) capable of changing the blowing angle in the inner and outer directions, and the outer air inlet is provided with a suction louver (29) capable of changing the suction angle in the direction perpendicular to the inner and outer directions. According to this configuration, it is possible to suppress the short circuit of the flow of outside air from the air outlet to the outer air inlet due to the inclination of the air outlet louver and the suction louver.

[0038] In the ventilation device of this embodiment, the air outlet (42) is opened downward, and the outer air inlet (43) is opened sideward. According to this configuration, it is possible to suppress the short circuit of the flow of outside air from the air outlet to the outer air inlet due to the difference in the opening directions of the air outlet and the outer air inlet.

[0039] In the ventilation device of this embodiment, the suction port is positioned directly above the gas generation source (cooking table 5), and the blowing direction of the air outlet is directed toward the periphery of the gas generation source. According to this configuration, outside air (fresh outside air) is blown out from the air outlet toward the periphery of the gas generation source, and the gas from the gas generation source is sucked in together with the indoor air from the suction port. The outside air from the air outlet is prevented from diffusing into the room, and the gas from the gas generation source is prevented from diffusing into the room. Therefore, effective ventilation can be performed while suppressing the influence on the temperature and humidity conditions in the room.

[0040] The ventilation system of this embodiment includes the above ventilation device, an exhaust duct (31) that guides the air sucked into the ventilation device to the outside, and an air supply duct (35) that guides the outside air taken in from the outside to the ventilation device. The suction port and the outer air inlet are connected to a single exhaust duct, and the air outlet is connected to the air supply duct. According to this configuration, the exhaust system of the ventilation system can be simplified.

[0041] In the ventilation system of this embodiment, a temperature sensor (55) for detecting the temperature of outside air taken in from the outside is provided. In the exhaust duct, a first exhaust duct (54) connected to the suction port and a second exhaust duct connected to the outside suction port are provided. In the second exhaust duct, a damper (56) for restricting the suction of air from the outside suction port (59) is provided when the detected temperature of the temperature sensor is higher than the dew point temperature in the room. According to this configuration, the suction of air from the outside suction port is restricted when condensation is unlikely to occur, and the suction amount of air from the suction port (57) of the range hood (52) can be increased.

[0042] Although this embodiment and the modified example have been described, as another embodiment, the above embodiment and the modified example may be combined in whole or in part.

[0043] Also, the technology of the present invention is not limited to the above embodiments, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in another way by the progress of technology or another derived technology, it may be implemented using that method. Therefore, the scope of the claims covers all embodiments that can be included within the scope of the technical idea.

Explanation of Reference Numerals

[0044] 1, 51: Ventilation system 5: Cooking table (gas generation source) 10, 41, 52: Range hood (ventilation device) 12: Hood 13: Side wall of the hood 18, 57: Suction port 21: First cover 23, 42: Air outlet 24: Air outlet louver 26: Second cover 28, 43, 59: Outside suction port 29: Suction louver 31: Exhaust duct 32, 54: First exhaust duct 33: Second exhaust duct 35, 53: Air supply duct 55: Temperature sensor 56: Damper

Claims

1. A ventilation device that takes in outside air and simultaneously discharges air from the interior, comprising: a hood having a suction port for sucking air from the interior; a first cover that covers the side wall of the hood with a gap from the outside; a second cover that covers the first cover with a gap from the outside, wherein an air outlet for blowing outside air into the interior is formed outside the suction port from the gap between the side wall of the hood and the first cover, and an outside suction port for sucking air from the interior into the gap between the first cover and the second cover is formed outside the air outlet. A ventilation device characterized by this.

2. The ventilation device according to Claim 1, characterized in that the blowing direction of the air outlet and the suction direction of the outside suction port intersect.

3. The air outlet and the outside suction port are open downward, and a blowing louver capable of changing the blowing angle in the inside-outside direction is provided at the air outlet, and a suction louver capable of changing the suction angle in a direction perpendicular to the inside-outside direction is provided at the outside suction port. The ventilation device according to Claim 2, characterized by this.

4. The ventilation device according to Claim 2, characterized in that the air outlet is open downward and the outside suction port is open sideways.

5. The ventilation device according to any one of Claims 1 to 4, characterized in that the suction port is positioned directly above the gas generation source, and the blowing direction of the air outlet is directed toward the periphery of the gas generation source.

6. A ventilation device according to any one of Claims 1 to 5, an exhaust duct for guiding the air sucked into the ventilation device outdoors, and an air supply duct for guiding the outside air taken in from outdoors to the ventilation device, wherein the suction port and the outside suction port are connected to one system of the exhaust duct, and the air outlet is connected to the air supply duct. A ventilation system characterized by this.

7. Comprising a temperature sensor for detecting the temperature of the outside air taken in from outdoors, wherein the exhaust duct is provided with a first exhaust duct connected to the suction port and a second exhaust duct connected to the outside suction port, and the second exhaust duct is provided with a damper for restricting the suction of air from the outside suction port when the detected temperature of the temperature sensor is higher than the dew point temperature of the interior. The ventilation system according to Claim 6, characterized by this.

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