WO2008032571A1

WO2008032571A1 - Range hood

Info

Publication number: WO2008032571A1
Application number: PCT/JP2007/066755
Authority: WO
Inventors: Naoya Takeuchi; Koichi Toyoda
Original assignee: Toto Ltd.
Priority date: 2006-09-14
Filing date: 2007-08-29
Publication date: 2008-03-20
Also published as: JP2008070049A

Abstract

A range hood capable of forming an air curtain increasing capture performance. The range hood placed above a cooking device has a suction opening placed facing the cooking device and sucking air and also has an ejection opening circumferentially extending around at least a portion of the suction opening and ejecting air that forms the air curtain directed toward the cooking device. The range hood has ejection condition control means for causing the air curtain to reach the vicinity of the cooking device in a shielding manner and, depending on the amount of air sucked from the suction opening, controls air that forms the air curtain such that the air is not affected by a suction airflow.

Description

Specification

Range hood Technical Field

[0001] The present invention relates to a range hood, and more particularly to a range hood that generates an air curtain.

Background art

Conventionally, a range hood has been disposed above a cooking device, and odors, oily smoke, and the like generated during cooking by the cooking device have been sucked and collected. Furthermore, attempts have been made to improve the collection performance of odors and oily smoke (for example, Patent Documents 1 to 3).

[0003] The range hood disclosed in Patent Document 1 forms a suction airflow that sucks air from the center of the range hood, and also directs the airflow from the range hood to the heating cooker around the suction airflow. Form. The air curtain wraps odors and oily smoke, and improves the collection performance by returning to the suction fan side along the flow of suction airflow.

[0004] In addition, the range hood disclosed in Patent Document 2 forms an air curtain around the suction airflow from the range hood toward the heating cooker, as in Patent Document 1. This air curtain can prevent the spread of odors and oily smoke generated during cooking by blocking the suction area for sucking odors and oily smoke generated during cooking and the external area around it. Improves performance.

[0005] Furthermore, the range hood disclosed in Patent Document 3 forms a suction air flow that sucks air from the center of the range hood, and the air that forms the air curtain moves from the periphery of the heating cooker to the range hood. It is discharged toward. This air curtain can prevent the spread of odors and oily smoke generated during cooking by blocking between the suction area and the external area around it, improving the collection performance.

Patent Document 1: Japanese Patent Application Laid-Open No. 2002-228222 (FIG. 2)

Patent Document 2: JP 2003-343855 A (Fig. 2)

Patent Document 3: Japanese Patent Laid-Open No. 11-337072 (Fig. 3) Disclosure of the invention

Problems to be solved by the invention

[0007] In the range hood disclosed in Patent Document 1, since the air curtain does not reach the vicinity of the heating cooker, disturbance is generated in the lower region between the range hood and the heating cooker, that is, in the region close to the heating cooker. When wind is present, odors and soot are leaked to the outside area under the influence of the wind, so it is difficult to improve the collection performance of the range hood. Here, turbulence is assumed to be airflow from an air conditioner or airflow from human movement.

[0008] On the other hand, in the range hood disclosed in Patent Document 2, odors, oily smoke, etc. ride on the flow of air force, and odors, oily smoke, etc. leak to the external area. It is difficult to improve the collection performance.

[0009] Furthermore, the range hood disclosed in Patent Document 3 has a problem that workability and cleanability are poor because it is discharged from the peripheral portion of the cooking device toward the range hood. This is because if an air curtain outlet is provided in the periphery of the cooking device, cooking waste may fall at the outlet and the cooking space may be reduced. In addition, since air curtain-related parts are mounted on the floor cabinet, there is a problem that the storage space of the floor cabinet is reduced. And the range hood is divided into two parts above and near the cooking device, making it difficult to manufacture and manage.

[0010] Therefore, an object of the present invention is to provide a range hood capable of forming an air curtain that improves the collection performance!

Means for solving the problem

[0011] According to one aspect of the invention,

A range hood disposed above the heating cooker,

A suction port arranged opposite to the heating cooker and for sucking air; and air that extends in the circumferential direction around at least a portion of the suction port and forms an air curtain toward the cooking device side In a range hood having a discharge port for discharging

The air curtain reaches the vicinity of the heating cooker and sucks from the suction port There is provided a range hood characterized by having discharge state control means for controlling the air forming the air curtain so as not to be affected by the suction airflow force according to the air volume.

The invention's effect

[0012] As described above, the range hood according to the present invention can form an air curtain that improves the collection performance.

BEST MODE FOR CARRYING OUT THE INVENTION

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

First, a range hood that is a first embodiment of the present invention will be described with reference to FIG. 1 and FIG. FIG. 1 is a front view showing a range hood and a heating cooker according to a first embodiment of the present invention, and FIG. 2 is a bottom view of the range hood of FIG.

As shown in FIG. 1, the range hood 1 is disposed above the heating cooker 70, and includes a hood body 2 and a suction fan 4 disposed inside the hood body 2. Yes.

[0016] The hood main body 2 has a lower part 2a and an upper part 2c disposed on the lower part 2a, and the suction fan 4 is accommodated in the upper part 2c. The internal space 2d of the lower portion 2a constitutes a suction air passage, and the air therein is sucked by the suction fan 4. The suction fan 4 is adjusted by a rotation adjustment means (not shown), for example, adjusting the frequency for an AC motor and the voltage for a DC motor, etc. I am able to do that. The hood body 2 may be disposed in contact with the wall, or may be disposed away from the room wall like an island type kitchen.

As shown in FIG. 2, the lower portion 2a of the hood main body 2 has a rectangular lower surface member 6, and the lower surface member 6 has a lower surface 6b having a central hole 6a. A current plate 8 is arranged inside the central hole 6a, and a suction port 10 is formed between the lower surface member 6 and the current plate 8 so as to face the cooking device 70 and suck air. . The suction port 10 has a rectangular ring shape and is provided along the periphery of the lower surface member 6, and the cooker side 12a is formed wider than the other side, that is, the back side 12b, the left side 12c and the right side 12d. Has been.

[0018] The lower surface 6b of the lower surface member 6 is directed toward the heating cooker 70, and the air forming the air curtain is Discharge ports 14b, 14c, and 14d to be discharged are provided between the peripheral edge 6c of the lower surface member 6 and the suction port 10. The discharge ports 14b, 14c, and 14d extend in the circumferential direction around a portion of the suction port 10. The suction port 10 may extend linearly, may extend in a curved line, or may be a combination thereof. In the present embodiment, the discharge ports 14b, 14c, 14d are composed of a back side discharge port 14b provided on the back side, a left side discharge port 14c provided on the left side, and a right side discharge port 14d provided on the right side. ing.

[0019] In the present invention, the directional force toward the cooking device 70 means the flow discharged with an angle of Θ force S0 to 30 ° shown in FIG. In other words, it is a flow that faces the outside of the range hood, including the vertical downward direction. Here, in FIG. 2 (bottom view), the outer side and the inner side in the first embodiment are referred to as the inner side, and the side closer to the peripheral edge 6c of the lower surface member 6 is referred to as the outer side.

[0020] Each of the rear side discharge port 14b, the left side discharge port 14c, and the right side discharge port 14d has a width changing portion 28 having a width changing contour in which the width changes.

As shown in FIGS. 1 and 2, each of the discharge ports 14b, 14c, 14d is connected to a discharge fan 34 through an air passage 32. The discharge fan 34 is a cross flow fan, for example, and is accommodated in the lower part 2a of the range hood body 2. The discharge fan 34 can be adjusted by the discharge state control means 60, for example, by adjusting the frequency for an AC motor and the voltage for a DC motor to vary the motor speed and adjust the wind speed or volume. Can be done. The discharge fan 34 is disposed in the range hood main body 2 inside the discharge ports 14b, 14c, and 14d.

As shown in FIG. 2, the outer sides of the discharge ports 14b, 14c, 14d are in a straight line parallel to the peripheral edge 6c of the lower surface member 6. The discharge ports 14b, 14c, and 14d are partially formed with wide regions that protrude inward, that is, toward the suction port 10 side.

[0023] Further, a louver 40 as an angle adjusting means is provided in the vicinity of the outlets of the discharge ports 14b, 14c, 14d so that the discharge angle can be adjusted. The nore bar 40 can adjust the discharge angle by the discharge state control means 60.

Next, the operation of the range hood according to the first embodiment of the present invention will be described.

[0025] The suction fan 4 sucks the air in the suction area 50 from the heating cooker 70 through the suction port 10. At the same time, the air is exhausted to the outside through the suction air passage 205, and at the same time, air is sent downward from the discharge ports 14b, 14c and 14d through the air passage 32 from the discharge fan 34. The delivered air, that is, the air forming the air curtain, reaches the vicinity of the heating cooker 70 so as to block the suction area 50 and the external area 51. By reaching the vicinity of the heating cooker 70, the influence of the turbulent wind (cross wind) W between the heating cooker 70 and the range hood 1 can be blocked by the air curtain. After reaching the vicinity of the heating cooker 70, the air curtain rises toward the suction port 10. At this time, the cooking exhaust flow is guided to the suction port 10. In this way, the amount of the cooked exhaust collected at the suction port 10 is increased by blocking the influence of the turbulent wind (crosswind) W and guiding the cooked exhaust. In other words, the collection performance is improved.

However, if the air volume of the suction fan 4 changes, the flow of the air curtain changes when the same air curtain is discharged. This change in flow will be explained in detail later. If the flow of the air curtain changes, the collection performance cannot be improved. Therefore, in order to always improve the collection performance even if the air volume of the suction fan 4 changes, it is effective to control the discharge state of the air curtain according to the change of the air volume of the suction fan 4.

[0027] In this embodiment, two specific examples of controlling the discharge state of the air curtain are provided. One is a means to adjust the air curtain discharge wind speed or air volume, and the other is a means to adjust the air curtain discharge angle. For the former, in this embodiment, the discharge fan 34 can adjust the wind speed or the air volume by changing the number of rotations of the motor according to the air volume of the suction fan 4 by the discharge state control means 60. It is like this. In addition, because of the latter, in the present embodiment, the nozzle 40 can adjust the discharge angle according to the air volume of the suction fan 4 by the discharge state control means 60.

Thus, the discharge state control means 60 can control the discharge state of the air curtain according to the air volume of the suction fan 4. In the present embodiment, the discharge air volume and the discharge angle can be adjusted by controlling the discharge state. More specifically, according to the discharge state control means 60, the air volume of the discharge fan 34 increases as the air volume of the suction fan 4 increases. In addition, as the air volume of the suction fan 4 increases, the angle discharged from the discharge port can be controlled to face the outside of the range hood. By controlling the discharge state of the air curtain, it is possible to block the influence of turbulent wind (cross wind) W and to induce cooking exhaust, and the cooking exhaust is collected at the suction port 10. Since the amount to be collected increases, the collection performance will be improved.

Next, an example of the contents of control by the discharge state control device 60 of the range hood 1 of the present embodiment will be specifically described.

FIG. 3 is a flowchart specifically showing the flow of control contents by the discharge state control device 60 of the range hood 1 of the present embodiment. Here, “S” in FIG. 3 indicates each step. 1 and 2 show the state of S8 in FIG. This will be explained in detail below, including the process of S8.

First, as shown in FIG. 3, in S 1, when the user selects a weak, medium, or strong air flow level of the suction fan 4 with a switch (not shown), the suction fan 4 is activated and cooking is performed. The air in the suction area 50 from the vessel 70 is sucked from the suction port 10.

Next, in S2, it is determined whether or not the air volume level of the suction fan 4 selected in S1 is “weak”. When the air flow level of the suction fan 4 is “weak”, the process proceeds to S3, and the rotation speed N of the suction fan 4 is detected. Then, in S4, it is determined whether the rotational speed N is higher than the predetermined rotational speed L. When the rotational speed N is higher than the predetermined rotational speed L, the process proceeds to S5, and the air flow level of the discharge fan 34 is set to “weakest”. On the other hand, if the rotational speed N is not higher than the predetermined rotational speed L, the process proceeds to S6 and the air volume level of the discharge fan 34 is set to “weak”.

Here, the meaning of this control content will be described in detail. The motor of the suction fan 4 has a force that is roughly adjusted by the rotation adjusting means. Even at the same frequency and voltage, the rotational speed slightly changes depending on the state of the suction air passage 205. When the air flow level of the suction fan 4 is “weak” and is higher than the predetermined rotation speed L, the pressure loss in the suction air passage 205 is high, and the air flow of the suction fan 4 is “low”. This means that there are fewer. Therefore, the air flow level of the discharge fan 34 is “weakest” according to the air flow of the suction fan 4, that is, the air flow can be optimized by making the air flow the smallest. On the contrary, when the air flow level of the suction fan 4 is “weak”, it is less than the predetermined rotation speed L. The pressure loss in the suction air passage 205 is low, and the air flow force S “weak” of the suction fan 4 is high. Therefore, according to the air volume of the suction fan 4, the air flow level of the discharge fan 34 is set to “weak” with a larger air volume than “weakest”, so that an optimal air curtain flow can be obtained.

Next, in S2, when the air volume level of the suction fan 4 is not “weak”, the process proceeds to S7, and it is determined whether or not the air volume level of the suction fan 4 selected in S 1 is “medium”. When the air volume level of the suction fan 4 is “medium”, the process proceeds to S8, and the air volume level of the discharge fan 34 is set to “medium”.

If the air flow level force S of the suction fan 4 is not “medium” in S7, the process proceeds to S9, and the rotational speed N of the suction fan 4 is detected. Then, in S 10, it is determined whether or not the rotational speed N is higher than the predetermined rotational speed H. When the rotational speed N is higher than the predetermined rotational speed H, the process proceeds to S11, and the air volume level of the discharge fan 34 is set to “strong”. On the other hand, if the rotational speed N is not higher than the predetermined rotational speed H, the process proceeds to S12 and the air volume level of the discharge fan 34 is set to “strongest”. Then, after S5, S6, S8, Sll, and S12, the process proceeds to S2 and S2 and subsequent steps are repeated until the user selects stop using a switch (not shown).

[0036] Here, an example in which the air volume of the suction fan 4 changes during operation will be described.

For example, when the user first selects the “low” air flow level of the suction fan 4 with a switch (not shown), the process proceeds to S5 or S6 depending on the pressure loss state of the suction air passage 205, and the discharge fan 34 Air volume force S “Weakest” or “Weak”. Thereafter, when the user selects the “medium” air volume level of the suction fan 4 with a switch (not shown), the process proceeds to S8 and becomes “the air volume force of the discharge fan 34”. As described above, the air flow of the discharge fan 34 is controlled to increase as the air flow of the suction fan 4 increases.

[0037] It should be noted that the setting of the wind speed or air volume in the "strongest, strong, medium, weak, weakest" of the discharge fan 34 is a predetermined value determined in advance through experiments or the like in consideration of the behavior of the suction airflow. It is becoming a value. Further, the predetermined rotational speed H is higher than the predetermined rotational speed.

[0038] In this way, the air volume of the suction fan 4 is adjusted so that the air volume of the discharge fan 34 is reduced, and conversely, the air volume of the discharge fan 34 is increased as the air volume of the suction fan 4 is increased. By performing control such as adjustment, an optimal air curtain flow can be obtained. As will be described in detail later, air is discharged from the discharge port with respect to the air volume sucked from the suction port 10. It is preferable that the ratio of air volume is 0 · 6 ～; As described above, the optimal air curtain flow is that the suction area 50 and the external area 51 are shut off to the vicinity of the heating cooker 70, and the cooking exhaust is guided from the vicinity of the heating controller 70 to the suction port 10. It is a flow. The collection performance can be improved by inducing the turbulent wind (cross wind) W, that is, the cooking exhaust gas without being affected by the turbulence from the external region 51.

[0039] In the above flowchart, the example in which the air volume of the discharge fan 34 is adjusted in accordance with the air volume of the suction fan 4 is shown, but in order to adjust the discharge angle of the air curtain that is not based on the air volume of the discharge fan 34, A case where the angle of the louver 40 is adjusted will be described. In this case, the air flow of the suction fan 4 can be adjusted by making adjustments as shown in parentheses of ί, S5, S6, S8, Sl, and S12 as shown in Fig. 3 Depending on the situation, the air curtain flow can be optimized. More specifically, the smaller the air flow of the suction fan 4, the more the air curtain discharge angle is adjusted to be inward so that the discharge angle of the air curtain is closer to the vertically downward direction. By performing control such as adjustment so as to face the outside of the range hood 1, an optimal air curtain flow can be obtained. By using the optimal air curtain flow, the influence of disturbance wind (crosswind) W can be cut off and the flow of cooking exhaust can be induced, and the amount of cooking exhaust collected at the suction port 10 Therefore, the collection performance is improved.

In the present embodiment, the example of adjusting the discharge air volume and the discharge angle has been described. However, only one of the discharge air volume and the discharge angle may be adjusted.

Furthermore, although an example in which the rotation speed N of the suction fan 4 is detected in order to estimate the air volume of the suction fan 4 has been shown, the current value of the suction fan 4 may be detected.

[0042] In order to estimate the air volume of the suction fan 4, the wind speed or pressure in the suction air path 205 may be detected that is not based on the rotation speed or current value of the suction fan 4.

[0043] Next, an experiment performed on the discharge state control will be described.

[Experimental example]

The apparatus shown in FIG. 4 is an apparatus in which the air curtain discharge unit used in the first embodiment of the present invention is mounted on the heating cooker 70 and the range hood 1. In addition, a cross wind generator 204 was provided, and a turbulent wind (cross wind) W was supplied to the pan 203 on the heating cooker 70. In addition, pre-CO The gas cylinder 201 was directly fed into the suction air channel 205 through the flow meter 202 at 12.5 liters / minute, and the CO concentration in the suction air channel 205 at that time was directly set as the supplied CO concentration.

[0045] Place the pan 203 in the heating cooker 70 at the same suction air volume as when it was directly supplied (for example, 200 m ³ / hour), and supply the CO gas cylinder 201 through the flow meter 202 at 12.5 liters / minute. The CO was discharged from 10 holes provided in a tube surrounded by a ring around the edge of the pan 203. The CO concentration in the suction air passage 205 at that time was taken as the collected CO concentration. In addition, an air curtain was formed, and when there was no air curtain, a disturbance wind (cross wind) W was supplied in the vicinity of the pan 203 at 0.3 m / sec. The collection rate C (%) was calculated by the following formula.

C = p 3 4 X 100… (Formula 1)

Here, p3 is the collected CO concentration, and p4 is the directly supplied CO concentration. As the CO concentrations p 3 and p 4, values obtained by subtracting the atmospheric concentration from the measured concentrations were adopted. The CO concentration was measured with a Vaisala CO converter GMT222. The atmospheric concentration was measured at a point about lm away from the edge of the cooking device 70 and about lm from the floor. The distance from the upper surface of the cooking device 70 to the lower surface of the range hood 1 is about 940 mm, and the distance from the center of the pan 203 to the end surface of the cross wind generator 204 is about 900 mm. As for the outlet size of the cross wind generator 204, the height is about 300mm from the height equivalent to the top of the heating cooker 70, and the depth is about 600mm.

Yes

FIG. 5 to FIG. 7 are schematic schematic diagrams of experiments using the apparatus shown in FIG. This is an explanation of the flow of air force and shows the mainstream. In other words, it shows the main flow that does not show all the flows.

5 to 7 all show the case where the suction air volume is 200 m ³ / hour, which corresponds to the condition A in FIG. Figure 5 is a discharge air volume 132m ³ / h (collection rate 34%), Figure 6 is a discharge air volume 207m ³ / h (collection rate 69%), Figure 7 is discharged air volume 244m ³ / h (collection rate 58%) Is shown.

In FIG. 6, the air curtain reaches the vicinity of the heating controller 70 so as to block the suction region 50 and the external region 51. By reaching the vicinity of the heating cooker 70, it is possible to use the air curtain to block the influence of the turbulent wind (cross wind) W between the heating cooker 70 and the range hood 1. After the air curtain reaches the vicinity of the heating cooker 70, the air curtain is directed to the suction port 10 and then rises. At that time, the cooking exhaust flow is guided to the suction port 10. This In other words, the amount of the cooked exhaust collected at the suction port 10 is increased by blocking the influence of the turbulent wind (cross wind) w and guiding the cooked exhaust. In other words, the collection performance is improved.

[0049] In the state shown in FIG. 6, after the operation of the discharge fan 34 has been started for more than 3 minutes, the vertical downward wind speed component on the cooking heater 70 to 200 mm (T in FIG. 6) is measured. As a result, the average time for 30 seconds was 0.15 m / sec to 0.39 m / sec. As shown in Fig. 7, it was confirmed that the components expelled to the outside increase when it exceeds 0.3 m / s. At this time, the measurement locations in the horizontal direction and depth direction in Fig. 6 were selected to be considered mainstream. In addition, it measured with the thermal anemometer. The probe 210 of the thermal anemometer was a directional type and was placed parallel to the heating cooker 70 as shown in FIG. 6 and only the vertically downward component was measured. Therefore, by setting the vertical downward wind velocity component 200mm above the cooking device 70 to 0.15m / sec to 0.39m / sec, the air curtain can reach the vicinity of the cooking device 70, so that the turbulent wind ( Crossflow) The flow can be made to block the influence of W and induce cooking exhaust. Therefore, we can use the force S to improve the collection performance.

[0050] Next, in Fig. 5, the air curtain wind speed or air volume is too small, and therefore the air curtain is pulled toward the suction port 10 and does not reach the vicinity of the heating cooker 70. In this case, it is difficult to block the influence of the turbulent wind (crosswind) W between the heating cooker 70 and the range hood 1. Leak to 51. Therefore, collection performance will fall.

In FIG. 7, the air curtain has too much wind speed or air volume, so it is not pulled too much toward the suction port 10 side, reaches too close to the heating cooker 70, and a part flows to the external region 51. That's what happens. In this case, it is possible to block the influence of the turbulent wind (cross wind) W between the heating cooker 70 and the range hood 1 because a flow to the external region 51 is formed to some extent. Will cause turbulence and expel cooking exhaust to the external area 51. Therefore, collection performance will fall.

[0052] When the suction air volume is changed, the force pulled toward the suction port 10 changes, so that the optimum air curtain flow (state in FIG. 6) changes according to the suction air volume. FIG. 8 shows the experimental results when the discharge air volume is changed. Condition A is a suction air volume of 200 m ³ / hour, Condition B is a suction air volume of 300 m ³ / hour, and Condition C is a suction air volume of 350 m ³ / hour.

[0054] When the discharge air volume is changed under each condition, the collection rate changes! /, But when the discharge air volume at the peak value of the collection rate is extracted, the suction air volume is 200 m. ³ / discharge air volume 207m ³ / h at time (% collection rate 69), the discharge air volume 282m ³ / h (collection rate 76%) than when the suction air volume 300 meters ³ /, the suction air volume 350 meters ³ / discharge air volume 320 m ³ in case / H (collection rate 77%). In other words, it was confirmed that when the suction air volume changes, the optimum discharge air volume also changes.

[0055] In each condition, the ratio of the discharge air volume to the suction air volume (discharge air volume / suction air volume) when the collection rate was 60% or more was calculated to be 0.6 to 1.2. . Furthermore, when the ratio of the discharge air volume and the suction air volume when the collection rate was 65% or more was calculated, it was 0.7 to 1.1. Therefore, when the ratio of the discharge air volume and the suction air volume is 0.6 to 1.2 times, the collection rate is high, and 0.7 to 1.1 times is more preferable.

[0056] Therefore, by adjusting the air curtain discharge air volume or the air speed according to the air volume of the suction fan 4, the influence of the disturbance wind (cross wind) W is blocked and the cooking exhaust is induced. Since the amount of the cooked exhaust gas collected at the suction port 10 is increased, the collection performance is improved.

Next, FIG. 9 shows experimental results when the discharge angle is changed. Condition D is a suction air volume of 300 m ³ / hour, and Condition E is a suction air volume of 420 m ³ / hour. As shown in Fig. 9, it was confirmed that the optimal air curtain discharge angle changed outward as the suction air flow increased. The discharge angle is preferably 0 ° to 30 ° in terms of Θ in FIG. 1, assuming that the suction air volume is further increased or the intensity of the turbulent wind (cross wind) W is increased. In addition, Θ represents an angle between the vertically downward direction and the direction in which the wind speed immediately after the discharge port becomes maximum. As a measurement method, the above-mentioned thermal anemometer is used to measure the point where the wind speed shows the maximum value. The direction in which the wind speed immediately after the discharge port becomes maximum is a direction perpendicular to the probe 210 of the thermal anemometer.

[0058] Therefore, by adjusting the discharge angle of the air curtain according to the air volume of the suction fan 4, the influence of the disturbance wind (cross wind) W is cut off and the cooking exhaust is induced. Since the amount of cooking exhaust collected at the suction port 10 is high, the collection performance is improved. Will be.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims. Needless to say, these are also included in the scope of the present invention. For example, although the example in which the rotation speed of the motor is varied as the discharge state control means 60 has been shown, the adjustment of the wind speed or the air volume is not limited to this, and the air discharged from the discharge ports 14b, 14c, 14d If the wind speed or air volume can be changed, As another example of varying the air speed or air volume, the cross-sectional area of the air passage 32 can be changed by a throttle means (not shown), or a hole (not shown) communicating with the internal space 2d is provided in the air passage 32. Adjust the cross-sectional area of the hole to make the amount of leakage variable.

[0060] For convenience of explanation, a case has been described in which a plurality of discharge fans 34 are provided and the wind speed or air volume is individually adjusted, but the number of discharge fans is reduced (for example, as a single discharge fan). It is possible to adjust the air speed or air volume for multiple air passages while reducing the number of discharge fans 34, for example, by diverting the air flow and changing the air flow distribution amount at the diverging part. .

Brief Description of Drawings

FIG. 1 is a front view showing a range hood and a heating cooker according to a first embodiment of the present invention.

Yes

2 is a bottom view of the range hood shown in FIG.

FIG. 3 is a flowchart specifically showing the flow of control contents of the discharge state control device in the range hood shown in FIG. 1.

FIG. 4 is a schematic diagram of the apparatus used in the experiment.

FIG. 5 is a schematic diagram of an experiment.

FIG. 6 is a schematic diagram of the experiment.

FIG. 7 is a schematic diagram of an experiment.

FIG. 8 is a graph showing experimental results.

FIG. 9 is a graph showing experimental results.

Explanation of symbols Range hood Range hood body Suction fan Lower surface member

rectifier

Suction port

b, 14c, 14d Discharge port Width change part Air passage

Discharge fan Louver Suction area External area Discharge state control means Heating cooker

Claims

The scope of the claims

[1] A range hood disposed above a heating cooker,

A discharge state control means for controlling the air forming the air curtain so that the air curtain reaches the vicinity of the heating cooker and is not affected by the suction airflow force according to the amount of air sucked from the suction port; A range hood characterized by having.

[2] The range hood according to claim 1, wherein the discharge state control means performs control so that the amount of air discharged from the discharge port increases as the amount of air sucked from the suction port increases.

[3] The discharge state control means controls the angle discharged from the discharge port to be directed to the outside of the range hood as the amount of air sucked from the suction port increases. Item 3. The range hood according to item 2.

[4] A suction fan for sucking air from the suction port, and a discharge fan for discharging air from the discharge port,

The range hood according to claim 1, wherein the discharge state control means detects a state change of a motor that drives the suction fan, and controls the motor that drives the discharge fan.

[5] A suction fan for sucking air from the suction port, and a discharge fan for discharging air from the discharge port,

The range hood according to claim 2, wherein the discharge state control means detects a state change of a motor that drives the suction fan, and controls the motor that drives the discharge fan.

[6] A suction fan for sucking air from the suction port, and a discharge fan for discharging air from the discharge port,

The discharge state control means detects a change in the state of a motor that drives the suction fan. 4. The range hood according to claim 3, wherein a motor that drives the discharge fan is controlled.