JP2010139223A - Exhaust fan system and method of operating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust fan system and a method of operating the exhaust fan system capable of suppressing movement of a gas between a space around an exhaust device and a space outside of the space, forming an air curtain of long range by reducing interference of an exhaust flow and the air curtain, and efficiently discharging the exhaust. <P>SOLUTION: This exhaust fan system includes the exhaust device having a roughly-rectangular suction port for sucking the gas in the exhaust space, and an air blower having a discharge port for discharging a gas for forming blocking flow for suppressing the movement of the gas between the exhaust space and the external space outside of the exhaust space. The gas forming the blocking flow is discharged from an upper part with respect to the suction port to the degree not interfering with the suction flow sucked to the suction port, and discharged obliquely downward to the degree not interfering with the suction flow. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an exhaust fan system and an operation method of the exhaust fan system, and more particularly to an exhaust fan system capable of forming an air curtain and an operation method of the exhaust fan system.

  There is an exhaust device that sucks and collects odors and exhausts them to the outside. For example, an exhaust device is installed above a cooking utensil such as a range installed in a kitchen, and oil smoke or odor rising from the cooking utensil is sucked and collected. On the other hand, recently, not only conventional kitchens in which cooking utensils are installed along walls, but also so-called island kitchens and peninsula kitchens in which cooking utensils are installed away from walls have begun to spread.

  In conventional kitchens, there are walls around the exhaust system and cooking utensils, so it is difficult for oil smoke and odor to diffuse, and oil smoke and odor can be collected relatively easily. However, in the island type kitchen and the peninsula type kitchen, the surroundings are open, so that oily smoke and odors are easily diffused, and it is difficult to collect oily smoke and odors. For this reason, an island type kitchen or a peninsula type kitchen requires an exhaust device having a higher collection performance than before. Also, even in a conventional kitchen, when there is a turbulent wind (cross wind) or the like, oil smoke or odor is likely to diffuse, and it may be difficult to collect oil smoke or odor.

Thus, a device has been proposed that collects and exhausts oily smoke and odor while blowing off a gas flow and blocking diffusion of oily smoke and odor rising from a cooking utensil or the like by an air curtain formed thereby ( For example, Patent Literature 1, Patent Literature 2, Patent Literature 3, Patent Literature 4, and Patent Literature 5).
JP 2003-207187 A Japanese Patent Laid-Open No. 2007-100780 JP 2001-311542 A JP 2008-70049 A JP 2008-57878 A

  The present invention suppresses the movement of gas between the space around the exhaust device and the space outside the exhaust device, and reduces the interference between the exhaust flow and the air curtain to form a thick air curtain having a long reach distance. Provided is an exhaust air blowing system that can be exhausted automatically and a method for operating the exhaust air blowing system.

  According to one aspect of the present invention, an exhaust device having a substantially rectangular suction port for sucking gas in the exhaust space and a cutoff flow that suppresses gas movement between the exhaust space and the external space outside the exhaust device are formed. An air blower having a discharge port for discharging the gas to be discharged, and the gas forming the cutoff flow is discharged from above the suction port to the extent that it does not interfere with the suction flow sucked into the suction port, An exhaust air blowing system is provided that is discharged obliquely downward so as not to interfere with the suction flow.

  According to another aspect of the present invention, the movement of the gas between the exhaust device having a substantially rectangular suction port for sucking the gas in the exhaust space and the external space outside the exhaust space is suppressed. A blower having a discharge port that discharges a gas that forms a cut-off flow, and the gas that forms the cut-off flow is above the suction port to the extent that it does not interfere with the suction flow sucked into the suction port. The exhaust air blowing system is discharged from the air and is discharged obliquely downward to the extent that it does not interfere with the suction flow, wherein the discharge direction of the gas forming the cutoff flow is changed according to the state of the air flow A method for operating the exhaust ventilation system is provided.

  According to the present invention, the movement of gas between the space around the exhaust device and the space outside the exhaust device is suppressed, and the interference between the exhaust flow and the air curtain is reduced to form a thick air curtain having a long reach distance. An exhaust air blowing system that can efficiently exhaust air and a method of operating the exhaust air blowing system are provided.

According to a first aspect of the present invention, there is provided an exhaust device having a substantially square suction port for sucking a gas in an exhaust space, and a gas that forms a blocking flow that suppresses the movement of the gas between the exhaust space and the external space outside the exhaust device. An air blower having a discharge port for discharging, and the gas forming the cutoff flow is discharged from above the suction port to the extent that it does not interfere with the suction flow sucked into the suction port, and the suction flow An exhaust air blowing system is characterized in that it is discharged obliquely downward so as not to interfere.
According to this exhaust air blowing system, while suppressing the movement of gas between the space around the exhaust device and the space outside it, the air curtain having a long and long reach by reducing the interference between the exhaust flow and the air curtain. An exhaust blower system is provided that can be formed and exhausted efficiently.

According to a second aspect of the present invention, in the first aspect of the present invention, the discharge direction of the gas forming the cutoff flow is an angle smaller than 60 degrees with respect to the vertically downward direction.
According to this exhaust ventilation system, the exhaust performance can be further improved.

According to a third aspect of the present invention, there is provided the exhaust air blowing system according to the first or second aspect, wherein the discharge direction of the gas forming the cutoff flow can be changed.
According to this exhaust air blowing system, an exhaust air blowing system is provided in which the wind direction of the air curtain can be changed according to the state of the disturbance flow, and the disturbance flow is improved.

According to a fourth aspect, in the third aspect, the apparatus further includes a detection device that detects the state of the airflow, and the discharge direction of the gas forming the cutoff flow can be changed according to the content detected by the detection device. This is an exhaust ventilation system.
According to this exhaust air blowing system, an exhaust air blowing system can be provided in which the air direction of the air curtain can be automatically changed according to the situation and the disturbance of the turbulent flow is improved.

According to a fifth aspect of the present invention, there is provided an exhaust device having a substantially square suction port for sucking a gas in the exhaust space, and a gas that forms a blocking flow that suppresses the movement of the gas between the exhaust space and the external space outside the exhaust device. An air blower having a discharge port for discharging, and the gas forming the cutoff flow is discharged from above the suction port to an extent that does not interfere with the suction flow sucked into the suction port, and the suction flow An exhaust air blowing system that is discharged obliquely downward to the extent that it does not interfere with the exhaust air blowing system, wherein the discharge direction of the gas forming the cutoff flow is changed according to the state of the air flow It is a driving method.
According to the operation method of the exhaust air blowing system, the movement of the gas between the space around the exhaust device and the outer space is suppressed, and the interference between the exhaust flow and the air curtain is reduced, resulting in a thick and long reach distance. An air curtain can be formed and exhausted efficiently, and further, an air curtain wind direction can be automatically changed according to the situation, and a method of operating an exhaust air blowing system with improved disturbance flow blocking performance is provided.

Embodiments of the present invention will be described below with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted suitably.
FIG. 1 is a schematic side view illustrating an exhaust air blowing system 1 according to an embodiment of the invention.
FIG. 2 is a schematic cross-sectional view illustrating the exhaust air blowing system 1.
FIG. 3 is a schematic bottom view illustrating the exhaust air blowing system 1.
FIG. 4 is a schematic perspective view of the exhaust air blowing system 1 as viewed from obliquely above.
FIG. 5 is a schematic perspective view of the exhaust air blowing system 1 as viewed from obliquely below.
FIG. 6 is a schematic view illustrating another configuration of the exhaust air blowing system 1. FIG. 6A is a schematic side view, and FIG. 6B is a schematic plan view.

  The exhaust air blowing system 1 according to this embodiment is installed in the upper periphery of a cooking utensil 70 such as a heating cooker, for example, and has a substantially rectangular suction port 20 that sucks the gas in the exhaust space 50 to form a suction flow D. The exhaust device 2 and the blower device 3 having the discharge port 30 that discharges gas forming an air curtain (blocking flow B) that suppresses the movement of gas between the exhaust space 50 and the external space 52 are provided. Hereinafter, the gas that forms the cutoff flow B that is discharged from the discharge port 30 is referred to as a “discharge flow 60”. The blower 3 is provided around the exhaust device 2. The “periphery of the exhaust device 2” is a place within about 1 m from the exhaust device 2. Further, the discharge flow 60 is discharged from above the suction port 20 so as not to interfere with the suction flow D, and is discharged obliquely downward so as not to interfere with the suction flow D. As a result, as will be described later, the movement of gas between the space around the exhaust device 2 and the outer space thereof is suppressed, and interference between the exhaust flow (suction flow D) and the air curtain (cut-off flow B) is prevented. It is possible to form an air curtain that is less thick and has a long reach, and can be efficiently evacuated.

Next, the structure of the exhaust air blowing system 1 will be described in detail with reference to FIGS.
First, the exhaust blower system 1 having a structure in which the exhaust device 2 and the blower 3 are in contact with each other will be described. However, the exhaust device 2 and the blower 3 may not be in contact with each other as described later with reference to FIG.

  As shown in FIGS. 2 to 5, the exhaust device 2 of the exhaust air blowing system 1 includes a casing 12. The casing 12 includes a substantially rectangular casing lower portion 12a, a casing intermediate portion 12b extending so as to narrow upward from the casing lower portion 12a, and a casing upper portion 12c disposed above the casing intermediate portion 12b. Yes. The blower 3 is provided on the outer surface of the casing middle portion 12b.

First, the exhaust device 2 will be described. The exhaust device 2 includes a suction port 20, a suction flow path 22, an exhaust fan 26, and an exhaust port 24.
Below the exhaust blower system 1, for example, a cooking utensil 70 (heating device) is provided, and a pan 72 or the like is placed on the cooking utensil 70. The suction port 20 is provided at the lower end of the casing lower part 12a so as to face the heating device 70, and ascending gas, for example, oil smoke or water vapor generated from the pan 72 or the like (hereinafter referred to as “oil smoke”). To form a suction flow D.

  The suction port 20 has a substantially square shape, so that, for example, smoke generated from a fish roaster can be sucked evenly compared to a circular shape, and suction leakage is reduced. Moreover, since it has the shape suitable for the kitchen space for home use, it can be used suitably for this kitchen space. Furthermore, since the shape of the cooking utensil 70 is generally a substantially square shape, the gas in the exhaust space 50 can be sucked efficiently with the minimum necessary size.

  The suction channel 22 is provided inside the casing lower part 12 a, the casing middle part 12 b, and the casing upper part 12 c, and guides the gas sucked from the suction port 20 to the exhaust fan 26 as indicated by an arrow E. The exhaust fan 26 is provided inside the casing upper portion 12 c, and the exhaust port 24 is provided above the exhaust fan 26. The exhaust fan 26 discharges the sucked gas to the outside from the exhaust port 24 as indicated by an arrow F.

  As shown in FIG. 2 and the like, a rectifying plate 48 may be provided at the suction port 20. The rectifying plate 48 has a substantially rectangular shape having an area smaller than the area of the suction port 20, and is provided at a substantially central portion of the suction port 20. Thereby, the gas in the exhaust space 50 is sucked from the narrow gap 22b between the rectifying plate 48 and the side surface 22a of the suction flow path 22 to form a suction flow D. Since the area of the gap 22b is sufficiently narrower than the area of the suction port 20, the suction flow D including the oil smoke generated from the pan or the like flows into the gap 22b at a higher flow rate. For this reason, collection performance can be improved.

  Further, since most of the suction flow D first hits the rectifying plate 48, oil generated from a pan or the like often adheres to the rectifying plate 48. Therefore, it is often sufficient to clean the rectifying plate 48, and the effect of improving the ease of cleaning of the exhaust air blowing system 1 can also be obtained.

  Moreover, although the casing 12 has the casing intermediate part 12b, it is not limited only to this, The casing intermediate part 12b does not need to be provided. In this case, the casing lower part 12a and the casing upper part 12c are connected. In addition to the casing lower part 12a and the casing upper part 12c, the blower 3 can be provided, for example, on the ceiling as shown in FIG.

  Next, the blower 3 will be described. The blower 3 can be provided at any location as long as the discharge flow 60 is discharged in the above-described manner and flows around the exhaust device 2. That is, the discharge flow 60 is discharged from above the suction port 20 so as not to interfere with the suction flow D, and is discharged obliquely downward so as not to interfere with the suction flow D. 2-5, the air blower 3 is provided in the outer periphery of the casing intermediate part 12b, and discharges the discharge flow 60 toward the diagonally downward direction of the casing 12. FIG.

  The blower 3 includes an intake port 34, a discharge fan 36, a discharge flow path 38, and a discharge port 30. As the discharge fan 36, for example, a cross flow fan can be used. The intake port 34 is provided at an obliquely upper portion of the discharge fan 36. The gas in the upper part of the casing middle part 12 b passes through the intake port 34 and is taken into the discharge fan 36. This gas is blown out in the direction of the discharge flow path 38 as shown by the arrow A by the discharge fan 36, and then discharged from the discharge port 30 to become a discharge flow 60. The discharge flow 60 divides the exhaust space 50 in which a large amount of oil smoke or the like to be removed exists and the external space 52 existing outside thereof, and the movement of gas between them is suppressed. That is, the discharge flow 60 forms a blocking flow B (air curtain) that suppresses the movement of gas between these spaces. Thereby, the inflow to the exhaust space 50 of the turbulent flow W, that is, the air flow such as air conditioning existing in the external space 52 is suppressed. Moreover, the outflow of oil smoke or the like to the external space 52 is suppressed. As a result, oily smoke or the like is well guided to the suction port 20 and appropriately exhausted. If the discharge direction of the discharge flow 60 is a direction substantially perpendicular to the traveling direction of the turbulent flow W, the entry of the turbulent flow W into the exhaust space 50 can be effectively suppressed.

  Note that the flow rate, flow velocity, and direction of the discharge flow 60 can be adjusted by appropriately selecting the shape of the discharge flow path 38. For example, the flow rate can be increased by increasing the cross-sectional area of the discharge channel 38, and the flow rate can be increased by making the discharge channel 38 narrow toward the discharge port 30 (so-called tapered shape). it can. By these measures, a stronger air curtain can be formed. For example, the velocity of the discharge flow 60 may be 1.5 to 5 m / second in the vicinity of the discharge port 30, and the vertical downward component of the wind speed at the position of the upper surface of the cooking utensil 70 may be 0.4 m / second or more.

  The discharge port 30 is provided on the side surface of the blower 3 and is provided on at least a part of the outer periphery of the suction port 20 of the exhaust device 2. For example, as shown in FIG. 3 to FIG. 5, they are provided on the left and right sides and the back side (rear) of the side where the cook stands (front), and can each have a substantially rectangular shape. Alternatively, although not shown, a configuration having a substantially “U” shape that is continuous in these three directions may be used.

  A total of three discharge fans 36 are provided corresponding to the three directions described above. Further, the number of the discharge fans 36 may be reduced, and for example, as a single discharge fan, the air flow may be branched and the discharge flow 60 may be discharged from the three-way discharge ports 30 described above. By doing in this way, a number of parts can be reduced.

  As shown in FIG. 3, the blower 3 can be configured not to be provided on the front side (the side where the cook stands). Thereby, the discharge flow 60 discharged from the discharge port 30 does not directly hit the cooker, and there is no possibility that the cook will be uncomfortable. Or you may make it the structure by which the air blower 3 is provided also in the front side according to a use purpose or a usage form.

  Further, although not shown, a wall may be provided on at least one of the rear side and the left and right sides, and the blower 3 may be provided on at least one other side.

  Further, as shown in FIG. 6, the exhaust air blowing system 1 according to the present embodiment may be configured such that the exhaust device 2 and the air blowing device 3 do not contact each other. In this case, the blower 3 is provided around the exhaust device 2 (for example, the ceiling). The “periphery of the exhaust device 2” is a place within about 1 m from the exhaust device 2.

  An ion wind can also be used for the blower 3. As will be described in detail below, the ion wind type blower device has a discharge electrode and a counter electrode, and forms a ionic wind by providing a potential difference between the discharge electrode and the counter electrode. .

7 and 8 are schematic perspective views illustrating the blower 3 using ion wind.
As shown in FIG. 7, the blower 3 includes a discharge electrode 202 and a pair of counter electrodes 203 and 203. The discharge electrode 202 and the counter electrode 203 can be metal plate-like members. The discharge electrode 202 has a protruding portion 202p protruding in the direction of the counter electrode 203 or 203. The discharge electrode 202 is provided above an intermediate position between the counter electrodes 203 and 203, and the protrusion 202 p of the discharge electrode 202 protrudes toward an intermediate position between the counter electrodes 203 and 203.

  A DC power supply 210 is connected to the discharge electrode 202, and a negative voltage is applied. The plus side of the DC power supply 210 and the counter electrodes 203 and 203 are grounded. The positive side of the DC power supply 210 can be connected to the discharge electrode 202, and the negative side of the DC power supply 210 and the counter electrodes 203, 203 can be grounded. In addition, since it is sufficient that a potential difference exists between the discharge electrode 202 and the counter electrodes 203 and 203, the discharge electrode 202 side may be grounded, or either side of the discharge electrode 202 and the counter electrode 203. Also, it may be configured not to be grounded.

  When a voltage of, for example, about −20 kV is applied to the discharge electrode 202 from the DC power supply 210, a potential difference is generated between the discharge electrode 202 and the counter electrode 203, 203, and the electric field strength near the tip of the protrusion 202p is locally increased. It becomes higher and corona discharge occurs. The applied voltage can be set to an arbitrary value according to the use situation, and can be set to about 10 kV to 20 kV, for example. Electrons generated by the corona discharge are drawn downward in the figure by an electric field formed between the discharge electrode 202 and the counter electrodes 203 and 203.

As shown in FIG. 7, when the extracted electrons adhere to gas molecules (for example, water vapor (H ₂ O), oxygen (O ₂ ), etc.), the gas molecules become negatively charged ions. Some of the ions are drawn into the counter electrodes 203 and 203, but the potentials from the left and right counter electrodes 203 and 203 are equipotential near the center of the counter electrodes 203 and 203 in the counter direction, so that the remaining ions are in the center. The light is discharged toward the lower space in the figure so as to pass through the vicinity. Thus, a part of the ions are emitted toward the lower space in the figure by the action of the electric field described above. As a result, a downward flow of gas molecules, that is, a flow of gas called an ionic wind is generated, whereby a discharge flow 60 is formed.

  In the ion wind type blower 3 shown in FIG. 7, a space sandwiched between the pair of counter electrodes 203 is the discharge port 30. When the counter electrode 203 is not paired, the vicinity of the counter electrode 203 becomes the discharge port 30 according to the discharge mode.

In the ion wind type blower 3, the air volume and the wind speed can be adjusted by changing the applied voltage. Further, the wind direction can be adjusted by changing the arrangement of the discharge electrode 202 and the counter electrode 203.
Further, as shown in FIG. 8, the ion wind type blower 3 can be configured in parallel. At the time of parallelization, the counter electrode 203 can be shared between the adjacent unit blowers 3A and 3B as shown in FIG. 8A, or as shown in FIG. 8B. It is possible to make a configuration that is not shared between the two. With the parallel arrangement, a thicker ion wind can be generated.

(Effect of this embodiment)
Next, the effect of this embodiment will be described with reference to FIGS. 1, 9, and 10. FIG.
FIG. 9 is a schematic side view showing an exhaust air blowing system according to a comparative example compared with this embodiment. FIG. 9A shows the exhaust air blowing system 101 according to Comparative Example 1, and FIG. 9B shows the exhaust air blowing system 102 according to Comparative Example 2.

  As shown in FIG. 9A, in the first comparative example, the exhaust device 2 and the blower device 3 are installed sufficiently separated from each other, and the blower device 3 is not provided around the exhaust device 2. That is, the blower 3 is provided on the ceiling 300 at a position away from the exhaust device 2. In this case, the exhaust space 50 shielded by the shutoff flow B formed by the discharge flow 60 is wider than the exhaust air blowing system 1 according to the present embodiment shown in FIG. For this reason, in the comparative example 1, it is necessary for the exhaust device 2 to exhaust air over a wider space than in the present embodiment. Therefore, exhaust efficiency is reduced.

  On the other hand, in this embodiment, the blower 3 is provided around the exhaust device 2, and the discharge flow 60 flows so as to pass through the periphery of the exhaust device 2, thereby shielding a narrow limited space near the exhaust device 2. can do. Accordingly, the exhaust efficiency is increased.

  Next, as illustrated in FIG. 9B, in the comparative example 2, the exhaust device 2 and the blower device 3 are installed close to each other. In this case, the exhaust space 50 that is shielded by the blocking flow B formed by the discharge flow 60 is as narrow as in the present embodiment. However, in Comparative Example 2, since the discharge port 30 and the suction port 20 are close and the discharge flow 60 and the suction flow D are close, there is a possibility that interference occurs between the discharge flow 60 and the suction flow D. As a result, in the vicinity of the discharge port 30, for example, in the region R shown in the figure, vortices, turbulence, and the like occur, and the air curtain (breaking flow B) is hardly formed. As a result, the air curtain (blocking flow B) is engulfed in the suction flow D, or conversely, the suction flow D is engulfed in the air curtain (cutting flow B) and the exhaust is expelled to the external space 52. Exhaust efficiency decreases.

  On the other hand, in the present embodiment, as shown in FIG. 1, the discharge flow 60 is discharged from above the suction port 20 so as not to interfere with the suction flow D, and obliquely downward so as not to interfere with the suction flow D. Discharged. For this reason, vortices and turbulence are less likely to occur. As a result, the air volume of the air curtain (blocking flow B) is appropriately secured, and a thick air curtain is formed. Moreover, the wind speed of an air curtain is also ensured appropriately and an air curtain with a long reach distance is formed. Accordingly, the disturbance flow W can be appropriately shielded, and the gas in the exhaust space 50 is suppressed from flowing out to the external space 52. Therefore, exhaust can be performed efficiently.

  Thus, according to this embodiment, while suppressing the movement of the gas between the space around the exhaust device 2 and the outer space, the exhaust flow (suction flow D) and the air curtain (cut-off flow B) Thus, an exhaust air blowing system is provided that can form an air curtain that is thick and has a long reach distance with less interference, and that can efficiently exhaust air.

Next, the effect of providing the blower 3 on the ceiling will be described with reference to FIG. FIG. 10 is a schematic side view for explaining the effect of providing the blower 3 on the ceiling.
As shown in FIG. 10, when the blower 3 is provided on the ceiling 300, the discharge port 30 is disposed at a position sufficiently higher than the suction port 20. For this reason, the interference between the discharge flow 60 and the suction flow D is suppressed. That is, the possibility that vortex or disturbance due to outlet pressure loss occurs in the region R in the vicinity of the discharge port 30 is reduced. Therefore, an air curtain is formed satisfactorily.

  Next, it demonstrates compared with the case where a ventilation apparatus is provided in the casing lower part 12a of the exhaust apparatus 2. FIG. As shown in FIG. 10, in the blower 803 provided in the casing lower part 12 a, the discharge flow 60 is discharged at an angle θ <b> 2 (hereinafter referred to as “inclination angle”) from the vertically lower side toward the external space 52 side. Sometimes, the discharge flow 60 and the suction flow D may interfere in the region R. On the other hand, in the blower device 3 provided on the ceiling 300, even if the discharge flow 60 is discharged at an inclination angle θ1 smaller than the inclination angle θ2, the discharge flow 60 does not pass through the region R, and the discharge flow 60 The possibility of interference with the suction flow D is small. That is, when the blower 3 is provided on the ceiling 300, the inclination angle θ related to the discharge flow 60 can be reduced. Thereby, the exhaust space 50 shielded by the air curtain (blocking flow B) can be narrowed. Therefore, the exhaust efficiency can be further improved.

  Moreover, when the air blower 3 is provided in the ceiling 300, it can be set as the structure where the air blower 3 is not conspicuous by devising the design of the air blower 3 (and ceiling 300 as needed). For this reason, the exhaust ventilation system 1 excellent in design property is provided. Moreover, since it becomes possible to install the air blower 3 if there is only a ceiling surface, a construction method can be unified. That is, the blower 3 can be installed by the same construction method without being influenced by the shape of the range hood (exhaust device 2), cabinet, or the like.

  Moreover, including the case where the air blower 3 is provided on the ceiling, providing the exhaust device 2 and the air blower 3 as separate bodies increases the degree of freedom in design and improves the design. That is, since the blower 3 is not attached to the exhaust device 2, the exhaust device 2 can be made compact. Further, as described above, by appropriately devising the design or the like, it is possible to make the air blower 3 inconspicuous, and for example, the air blower 3 can be seen as an illumination device.

Example 1
Next, a preferable discharge direction of the discharge flow 60 will be described using the first embodiment with reference to FIGS.
FIG. 11 is a schematic diagram illustrating the exhaust air blowing system 1 used in the first embodiment. FIG. 11A is a schematic side view, and FIG. 11B is a schematic plan view.

As shown in FIG. 11, the laboratory has a width of 5.86 m, a depth of 3.92 m, and a height of 2.7 m. In this laboratory, a peninsula-type kitchen, that is, the cook faces the living side. A kitchen in the shape of a peninsula with one side of the kitchen counter touching the wall was installed. The kitchen counter 74 is provided with a cooking utensil 70 and a sink (sink) 500. As the kitchen counter 74, a frame kitchen (width: 2100 mm, depth: 700 mm, height 860 mm) manufactured by TOTO Corporation was used. As the cooking utensil 70, an IH cooking device (electromagnetic cooking device) was used, and an IH cooking heater (model number: EHP-M46S, width: 600 mm, depth: 520 mm) manufactured by Toshiba Corporation was used. A pan 72 is placed on the cooking utensil 70. The pot 72 had a diameter of 230 mm and a depth of 170 mm, and water was added so that the water depth was 130 mm. The initial amount of water is 5 liters.
The exhaust device 2 (range hood) was installed immediately above the cooking utensil 70 at a location 1 m from the kitchen counter 74 and 1.9 m from the floor. As the exhaust device 2, a super clean hood (model number: KNKS090, width: 900 mm, depth: 650 mm, height: 350 mm) manufactured by TOTO Corporation was used. The exhaust air volume is 400 m ³ / hour.

  The blower 3 is provided on the ceiling 300 behind the kitchen counter 74. The blower 3 extends to the upper rear side from the cooking utensil 70 to the sink (sink) 500. The blower 3 is obtained by connecting two blowers 3M and 3N in the extending direction, and the total length of both is 2.1 m. However, the blower 3 may be an integrated device. The distance L from the kitchen counter 74 on the ceiling surface of the blower 3 was 0 m and 0.6 m. The suction direction of the gas to the blower 3 is from the kitchen side to the living side. Regarding the discharge direction of the discharge flow 60, the inclination angle θ was changed from 0 degree to 60 degrees.

As the air blower 3, the ion wind type air blower described above with reference to FIGS. 7 and 8 was used. In this example, a biaxial ion wind generator as shown in FIG. 8A having two discharge electrodes 202 was used. The applied voltage was 12 kV. The air volume is 3.9 m ³ / min.
Further, as the turbulent flow W, a gas flow from a cross flow fan 6 (Royal Electric Co., Ltd., FM-090060) simulating an air conditioner was used. Regarding the position of the cross flow fan 6, the center of the cross flow fan 6 is 1.092 m from the opposite wall surface 350 facing the cooker, and 1.8 m from the wall surface 351 on the cooking utensil 70 side. The lower end of the exit was 2.1 m from the floor. The cross flow fan 6 has a length of 596 mm from the wall surface 351 on the cooking utensil 70 side to the wall surface 352 on the sink 500 side. In addition, the wind speed of the turbulent flow W was adjusted to be 0.2 m / sec on the average on the surface formed vertically upward from the surface behind the kitchen counter 74.

  Note that vent holes 331 and 332 having an inner diameter of 140 mm are provided at two locations on the living side. The vent 331 is provided on the wall surface 352 on the sink 500 side at a position 0.6 m from the opposing wall surface 350 and a height of 0.275 m. The vent 332 is provided on the wall surface 351 on the cooking utensil 70 side at a position of 1.34 m from the opposing wall surface 350 and 0.295 m from the ceiling 300.

Next, the contents of the experiment will be described with reference to FIGS.
FIG. 12 is a schematic diagram showing the flow of the experiment.
FIG. 13 is a schematic diagram for explaining a CO ₂ generation method and a CO ₂ collection rate measurement method.
In this embodiment, the discharge performance was compared by changing the discharge direction of the discharge flow 60.

First, as shown in step S <b> 10 of FIG. 12, the cooking utensil 70 was operated at 2 kW to heat the pan 72. And as shown to step S11, the water in the pan 72 begins to boil. Thereafter, as shown in step S12, 5 minutes after the water boiled, the generation of oil smoke and the like from the pan 72 was simulated, and the supply of CO ₂ (carbon dioxide) was started.

CO ₂ was generated by the following method. As shown in FIG. 13, a tube communicating from the CO ₂ gas cylinder was provided in a ring shape at the upper edge of the pan 72. At the upper edge of the pot 72, the tube was provided with 10 holes. CO ₂ from the CO ₂ gas cylinder flowing to the tube is released from this hole in the laboratory. A mass flow (MODEL 3660 manufactured by KOFLOC) for adjusting the flow rate was provided in the middle of the CO ₂ supply path. Then, CO ₂ was supplied at a flow rate of 12.5 liters / minute while boiling the water in the pan 72. CO ₂ from the CO ₂ gas cylinder flowing to the tube is discharged into the laboratory from the hole as described above. A part of this CO ₂ rises or diffuses along with an updraft with water vapor.

Then, as shown in step S13 of FIG. 12, 10 minutes after starting the supply of CO ₂ , the operation of the cooking utensil 70 was stopped and the supply of CO ₂ was stopped. Thereafter, as shown in step S14, the experiment was terminated after stopped after 20 minutes the supply of operating and CO ₂ cookware 70.

Using this operation, the maximum CO ₂ concentration and the CO ₂ collection rate were measured and calculated.
First, a method for measuring the maximum CO ₂ concentration will be described.
The measurement point of the maximum CO ₂ concentration is 4.2 m from the kitchen counter 74 on the horizontal plane, 1.96 m from the wall surface 351 on the cooking utensil 70 side, and the height from the floor is human nose. In consideration of the position of 1.5 m, it was set to 1.5 m. A CO ₂ sensor (GMT 222 manufactured by Vaisala) was installed at this point, and the CO ₂ concentration was measured. Then, the maximum value of the CO ₂ concentration when measured for a certain period of time, specifically 13 minutes from 7 to 20 minutes from the start of CO ₂ supply, was obtained, and this was taken as the “maximum CO ₂ concentration”. The measurement was performed by changing the discharge direction of the discharge flow 60 from the blower 3 for each of L = 0 m and L = 0.6 m between an inclination angle of 0 degrees and 60 degrees.

なお、右辺の分子の「ダクト内ＣＯ_２濃度」は、排気装置２の排気ダクト内において、ＣＯ_２供給開始から７〜１０分の３分間測定した場合のＣＯ_２濃度の平均値である。また、「室内ＣＯ_２濃度」は、壁面３５３から０．３ｍ、壁面３５１から１．９６ｍで、床から０．３ｍの高さの地点において、ＣＯ_２供給開始から７〜１０分の３分間測定した場合のＣＯ_２濃度の平均値である。 Next, a method for calculating the CO ₂ collection rate will be described.
CO ₂ capture rate, as shown in FIG. 13, the CO ₂ concentration measured using a CO ₂ sensor provided in the exhaust duct of the exhaust system 2 (GMT222 of Vaisala Inc.), using the following formula Calculated. The measurement was performed by changing the discharge direction of the discharge flow 60 from the blower 3 for each of L = 0 m and L = 0.6 m between an inclination angle of 0 degrees and 60 degrees.

Incidentally, "duct CO ₂ concentration" of the right side of the molecule, in the exhaust duct of an exhaust device 2, an average value of the CO ₂ concentration measured 3 minutes 7-10 minutes from CO ₂ supply start. The “indoor CO ₂ concentration” is 0.3 m from the wall surface 353 and 1.96 m from the wall surface 351, and measured for 3 minutes from 7 to 10 minutes from the start of CO ₂ supply at a point 0.3 m above the floor. This is the average value of the CO ₂ concentration.

Next, experimental results will be described with reference to FIGS.
14 and 15 are graphs showing the experimental results. The horizontal axis represents the inclination angle θ of the discharge flow 60, and the vertical axis represents the maximum CO ₂ concentration in FIG. 14 and the CO ₂ collection rate in FIG. 14A and 15A show the experimental results when L = 0 m, and FIGS. 14B and 15B show the experimental results when L = 0.6 m.

14 and 15, when L = 0 m, the inclination angle θ is 20 ° to 50 °, and when L = 0.6 m, the inclination angle θ is 10 ° to 50 °, and the CO ₂ collection rate is 80% or more. It was confirmed that the collection performance was good. Further, the collection performance is improved as the inclination angle θ approaches 50 degrees. This is considered to be because the disturbance flow W is blocked by the air curtain at a position away from the kitchen counter 74 as the inclination angle θ increases, and the disturbance flow W does not easily reach the periphery of the cooking utensil 70. However, when the tilt angle θ is tilted up to 60 degrees, the collection performance decreases. It is considered that this is because the disturbance flow W enters the kitchen space from the lower part of the air curtain and the suction flow D is disturbed around the kitchen counter 74.

  From the above, it can be said that the discharge direction of the discharge flow 60 is preferably an angle larger than 0 degree and smaller than 60 degrees with respect to the vertically downward direction. More preferable exhaust performance can be realized by setting the angle to 10 to 50 degrees with respect to the vertically lower side, and further preferably setting to 20 to 50 degrees with respect to the vertically lower side.

  Here, it is understood from the experimental results that it is most preferable to set the inclination angle θ to 50 degrees. However, in an actual environment, it is necessary to consider the influence of the movement of people in the living space or the installation of a dining table or the like. If the cutoff flow B (air curtain) flows in a place away from the kitchen counter 74 by increasing the inclination angle θ, there is a possibility that the air curtain may hit the dining table and the dish or seated person on the dining table. For this reason, depending on the layout of the living space, the inclination angle θ may be preferably smaller than 50 degrees.

(Example 2)
Next, the discharge direction of the discharge flow 60 when the periphery of the sink (a sink) is taken into consideration will be described with reference to FIGS. 11, 13, 16, and 17 using the second embodiment.

In Example 2, the same exhaust air blowing system 1 and disturbance flow W as Example 1 described above with reference to FIG. 11 were used. The exhaust device 2 was operated at an exhaust air volume of 400 m ³ / hour, as in Example 1. Only L = 0 m was used as the position of the blower 3. Moreover, the case where the air blower 3 operate | moved and the case where it does not operate were used. About the discharge direction of the discharge flow 60 at the time of operating the air blower 3, inclination-angle (theta) was changed from 0 degree to 40 degree | times. Moreover, the case where the disturbance flow W was generated and the case where it was not generated were used. In addition, an empty pan was used without putting water in the pan 72.

Next, the experimental contents and experimental results will be described.
FIG. 16 is a schematic diagram showing the flow of the experiment.
In the present embodiment, a comparison was made with respect to the diffusion manner of the sink odor when the discharge flow 60 was not generated and when the discharge flow 60 was generated and the discharge direction was changed.

First, as shown in step S < _b > 20 of FIG. 16, generation of sink odor was simulated to generate CO ₂ from the sink 500. CO ₂ was generated in the same manner as in Example 1 described above with reference to FIG. However, the holed portion of the tube was installed on the bottom surface of the sink 500. The flow rate of CO ₂ was 3.7 liters / minute. The pan 72 was not heated, and CO ₂ was not generated from places other than the sink 500.

Thereafter, as shown in step S21 in FIG. 16, and stops the supply of CO ₂ from the start of the supply of the CO ₂ after 10 minutes. Thereafter, as shown in step S22, the experiment was terminated 20 minutes after the supply of CO ₂ was stopped.

Using this operation, the maximum CO ₂ concentration and the average CO ₂ concentration were measured and calculated for each case of the discharge flow 60 and the disturbance flow W described above. The measurement points and measurement means are as described above for the maximum CO ₂ concentration of Example 1. The “maximum CO ₂ concentration” is a maximum value of the CO ₂ concentration when measured for a certain period of time, specifically for 13 minutes from 7 to 20 minutes from the start of CO ₂ generation. The “average CO ₂ concentration” is an average value of the CO ₂ concentration when measured for a certain period of time, specifically, for 3 minutes from 7 to 10 minutes from the start of CO ₂ generation.

FIG. 17 is a graph showing the experimental results. In the horizontal axis of FIG. 17, the left end represents the case where the blower 3 is not operated, and the rest represents the inclination angle θ of the discharge flow 60 when the blower 3 is operated. The vertical axis represents the maximum CO ₂ concentration in FIG. 17 (a) and the average CO ₂ concentration in FIG. 17 (b).

From FIG. 17, it was confirmed that when the inclination angle θ is 20 degrees to 30 degrees, the CO ₂ concentration is about 1/2 to 1/3 as compared with the case where the blower 3 is not operated. On the other hand, when the inclination angle θ exceeds 40 degrees, the CO ₂ concentration increases. In the first embodiment described above, the gas flow from the outside to the inside (to the exhaust device 2) around the cookware 70 due to the suction flow D by the exhaust device 2 and the rising airflow generated on the cookware 70. In the second embodiment, such a gas flow does not exist in the vicinity of the sink 500. Therefore, if the inclination is larger than 40 degrees, CO ₂ is easily diffused to the living side. It is thought that.

  From the above, in order to extend the blower 3 to the periphery of the sink 500 and have both good exhaust performance and good suppression performance of sink odor diffusion, the inclination angle θ is set to 20 degrees to 30 degrees. Is preferred.

(Other examples)
Next, another specific example will be described with reference to FIGS.
FIG. 18 is a schematic cross-sectional view illustrating another configuration of the exhaust air blowing system 1.
As shown in FIG. 18A, the blower 3 can be embedded in the ceiling 300. Thereby, the flatness of the ceiling surface is maintained, and a clean appearance is exhibited.
As shown in FIG. 18B, the drive main body 31 of the blower 3 can be provided on the ceiling 300, and the discharge port 30 can be provided on the ceiling 300. In this case, the discharge port 30 can be an air path opened obliquely.

FIG. 19 is a schematic side view illustrating still another configuration of the exhaust air blowing system 1.
As shown in FIG. 19, the blower 3 can be provided in the casing middle portion 12 b (hood), the casing upper portion 12 c (duct), or both of the exhaust device 2. By providing a plurality of air blowers 3 in parallel, the air curtain becomes thicker and the blocking performance is improved.

FIG. 20 is a schematic side view illustrating still another configuration of the exhaust air blowing system 1.
As shown in FIG. 20, when there is a hanging wall 310 such as a beam in the room, the blower 3 can be provided in contact with the hanging wall 310. Thereby, the external appearance which the air blower 3 and the drooping wall 310 integrated is obtained, and the clean external appearance is exhibited.

FIG. 21 is a schematic view illustrating still another configuration of the exhaust air blowing system 1. FIG. 21A is a schematic plan view, and FIG. 21B is a schematic side view.
As shown in FIG. 21, when there is a storage shelf (wall cabinet or the like) 400 around the kitchen, the blower 3 can be provided in contact with the storage shelf 400. Thereby, the external appearance which the air blower 3 and the storage shelf 400 integrated is acquired, and the clean external appearance is exhibited.

FIG. 22 is a schematic side view illustrating still another configuration of the exhaust air blowing system 1.
As shown in FIGS. 22A and 22B, the discharge direction of the discharge flow 60 can be changed. Thereby, the discharge direction of the discharge flow 60 can be changed according to the state of the airflow such as the disturbance flow W, and the entry of the disturbance flow W into the exhaust space 50 can be effectively suppressed. For example, the discharge direction of the discharge flow 60 can be changed according to the change in the air direction of the air conditioner. As described above, if the discharge direction of the discharge flow 60 is set to a direction substantially perpendicular to the traveling direction of the turbulent flow W, the entry of the turbulent flow W into the exhaust space 50 can be effectively suppressed. Taking this into account, the wind direction of the discharge flow 60 can be adjusted.

  Also, the discharge direction can be changed depending on the situation such as the cooking mode, and an optimal shielding space can be formed for each situation. For example, when cooking that generates a lot of smoke, such as grilled fish or stir-fried food, even if the inclination angle θ is increased by avoiding an increase in interference with the suction flow D by increasing the exhaust air volume, sufficient exhaust is achieved. It is possible to evacuate properly by the function. For this reason, the inclination angle θ can be increased. The same applies when using a grill for grilling fish.

  The discharge direction of the discharge flow 60 can be changed by making the direction of the discharge flow path 38 and the positions of the discharge electrode 202 and the counter electrode 203 variable.

  Although not shown, the wind speed of the discharge flow 60 can also be changed. The wind speed of the discharge flow 60 can be changed by changing the rotation speed of the discharge fan 36 or changing the applied voltage between the discharge electrode 202 and the counter electrode 203. As a result, the discharge flow 60 can be discharged at an appropriate wind speed according to the wind speed of the turbulent flow W, and power consumption can be reduced.

FIG. 23 is a schematic side view illustrating still another configuration of the exhaust air blowing system 1.
As shown in FIG. 23, the exhaust air blowing system 1 further includes a detection device 4 that detects the state of the airflow, and the discharge direction of the discharge flow 60 can be changed according to the content detected by the detection device 4. Can do. An anemometer, an anemometer, etc. can be used for the detection device 4, and the detection device 4 detects, for example, the wind direction, the air volume, the wind speed, the pressure, etc. of the turbulent flow W. Thereby, the optimal discharge flow 60 can be realized automatically. The detection device 4 can be provided at an arbitrary place depending on the situation. For example, as shown in the drawing, the detection device 4 can be provided in the cooking utensil 70, the exhaust device 2, the blower device 3, or the like.

The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate.
Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

1 is a schematic side view illustrating an exhaust ventilation system 1 according to an embodiment of the invention. 1 is a schematic cross-sectional view illustrating an exhaust air blowing system 1. FIG. 1 is a schematic bottom view illustrating an exhaust air blowing system 1. FIG. 1 is a schematic perspective view illustrating an exhaust air blowing system 1 as viewed from obliquely above. It is the model perspective view seen from the slanting lower part which illustrates the exhaust ventilation system. 3 is a schematic view illustrating another configuration of the exhaust air blowing system 1. FIG. It is a model perspective view which illustrates the air blower 3 using an ion wind. It is a model perspective view which illustrates the air blower 3 using an ion wind. It is a model side view showing the exhaust ventilation system which concerns on the comparative example contrasted with this embodiment. It is a model side view for demonstrating the effect of providing the air blower 3 in a ceiling. 1 is a schematic diagram illustrating an exhaust air blowing system 1 used in Example 1. FIG. It is a schematic diagram showing the flow of experiment. Method of measuring the CO ₂ generation method and CO ₂ capture rate is a schematic diagram for explaining the. It is a graph showing an experimental result. It is a graph showing an experimental result. It is a schematic diagram showing the flow of experiment. It is a graph showing an experimental result. 3 is a schematic cross-sectional view illustrating another configuration of the exhaust air blowing system 1. FIG. 4 is a schematic side view illustrating still another configuration of the exhaust air blowing system 1. FIG. 4 is a schematic side view illustrating still another configuration of the exhaust air blowing system 1. FIG. 4 is a schematic view illustrating still another configuration of the exhaust air blowing system 1. FIG. 4 is a schematic side view illustrating still another configuration of the exhaust air blowing system 1. FIG. 4 is a schematic side view illustrating still another configuration of the exhaust air blowing system 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust blower system, 2 Exhaust apparatus, 3 Blower, 3A unit blower, 3B unit blower, 3M blower, 3N blower, 4 Detection apparatus, 6 Cross flow fan, 12 Casing, 12a Casing lower part, 12b Casing middle Part, 12c casing upper part, 12d outer peripheral surface, 20 suction port, 22 suction flow path, 22a side surface, 22b gap, 24 exhaust port, 26 exhaust fan, 30 discharge port, 31 driving body of blower 3, 34 intake port, 36 Discharge fan, 38 Discharge flow path, 48 Rectifier plate, 50 Exhaust space, 52 External space, 60 Discharge flow, 70 Cooking utensil, 72 Pan, 74 Kitchen counter, 101 Exhaust air blow system, 102 Exhaust air blow system, 202 Discharge electrode, 202p Projection, 203 Opposite pole, 210 DC power supply, 300 Ceiling, 10 hanging wall, 331 vent, 332 vent, 350 facing wall, 351 wall, 352 wall, 400 storage shelf, 500 sink (sink), 803 blower, 830 outlet, A arrow, B cutoff flow, D suction flow , E arrow, F arrow, L distance, R region, W disturbance flow, θ, θ1, θ2, θ3, θ4 angle (tilt angle)

Claims (5)

An exhaust device having a substantially rectangular suction port for sucking gas in the exhaust space;
An air blower having a discharge port for discharging a gas that forms a blocking flow that suppresses the movement of the gas between the exhaust space and the outer space outside the exhaust space;
With
The gas forming the blocking flow is discharged from above the suction port so as not to interfere with the suction flow sucked into the suction port, and is discharged obliquely downward so as not to interfere with the suction flow. Exhaust air blowing system.   The exhaust air blowing system according to claim 1, wherein a discharge direction of the gas forming the cutoff flow is an angle smaller than 60 degrees with respect to a vertically downward direction.   The exhaust air blowing system according to claim 1 or 2, wherein a discharge direction of the gas forming the cutoff flow is changeable. It further comprises a detection device that detects the state of airflow,
The exhaust air blowing system according to claim 3, wherein the discharge direction of the gas forming the cutoff flow can be changed according to the content detected by the detection device. An exhaust device having a substantially rectangular suction port for sucking gas in the exhaust space;
An air blower having a discharge port for discharging a gas that forms a blocking flow that suppresses the movement of the gas between the exhaust space and the outer space outside the exhaust space;
Have
The gas forming the blocking flow is discharged from above the suction port so as not to interfere with the suction flow sucked into the suction port, and is exhausted obliquely downward so as not to interfere with the suction flow. Driving method,
A method for operating an exhaust air blowing system, wherein a discharge direction of a gas forming the cut-off flow is changed according to a state of an air flow.

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