JP2020030006A - Range hood - Google Patents

Abstract

To provide a range hood, in which a user does not feel troublesomeness without frequently repeating increase and decrease of an air quantity of a fan and a rotation number of a filter during cooking.SOLUTION: The range hood has a temperature sensor 300 for detecting temperature of a top face of a cooker, a fan 116 for sucking oil smoke generated above the cooker and exhausting the smoke to outside, and a control part 130 for gradually changing the air quantity of the fan 116 by comparing the top face temperature detected by the temperature sensor 300 with preset threshold temperature. Threshold temperature t2(°C) when the air quantity of the fan 116 is reduced to a stage lower by one stage from an optional stage, is set lower than threshold temperature t1(°C) when the air quantity of the fan 116 is increased to the optional stage from the stage lower by one stage.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a range hood.

  2. Description of the Related Art Conventionally, there is known a range hood in which a top surface temperature of a cooking appliance is detected by a temperature sensor provided in the range hood, and the air volume of the range hood is controlled based on the detected top surface temperature (Patent Document 1). This range hood performs control such that when the detected temperature is equal to or higher than a threshold temperature, the air volume is increased, and thereafter, when the temperature decreases and becomes equal to or lower than the threshold temperature, the air volume is reduced.

JP 2012-32102 A

  However, the range hood described in Patent Literature 1 has a problem that if the top surface temperature is stable near the threshold temperature, the air volume is repeatedly increased and decreased during cooking, which makes the user feel troublesome. there were.

  Therefore, an object of the present invention is to provide a range hood in which the air volume of a fan and the number of rotations of a filter are not repeatedly increased and decreased during cooking and a user does not feel troublesome.

  In order to achieve the above object, a range hood according to the present invention includes a temperature sensor for detecting a top surface temperature of a cooking appliance, a fan for sucking oil smoke generated above the cooking appliance and exhausting the smoke outside, and a ceiling sensor for detecting the temperature sensor. A controller that compares the surface temperature with a preset threshold temperature to change the air flow of the fan in a stepwise manner, wherein the threshold temperature t2 when the airflow of the fan is reduced from an arbitrary step to one step lower (° C.) is set to be lower than the threshold temperature t1 (° C.) at which the air volume of the fan is increased from the lower stage to the arbitrary stage.

  According to another embodiment of the present invention, there is provided a range hood, comprising: a compound eye temperature sensor for detecting a top surface temperature of a cooking appliance by a plurality of pixels; and an oil smoke generated above the cooking appliance, and exhausted to the outside. A fan, and a control unit for changing the fan airflow stepwise by comparing the top surface temperature of each pixel detected by the compound eye temperature sensor with a preset threshold condition, and changing the fan airflow from an arbitrary stage. The threshold condition for increasing the level to the next level is that n1 or more pixels of the compound eye temperature sensor are detecting the temperature of t1 (° C.) or more, and the air flow of the fan is set to the level of the level one step higher. The threshold condition when the temperature is lowered to the above-mentioned arbitrary stage is that n2 or more pixels of the compound eye temperature sensor detect a temperature of t2 (° C.) or less, and at this time, n1 <n2.

  According to another embodiment of the present invention, there is provided a range hood, comprising: a compound eye temperature sensor for detecting a top surface temperature of a cooking appliance by a plurality of pixels; and an oil smoke generated above the cooking appliance, and exhausted to the outside. A fan, and a control unit for changing the fan airflow stepwise by comparing the top surface temperature of each pixel detected by the compound eye temperature sensor with a preset threshold condition, and changing the fan airflow from an arbitrary stage. The threshold condition for increasing to the next higher stage is that n1 or more pixels of the compound-eye temperature sensor have detected a temperature of t1 (° C.) or more for a predetermined time x1 or more, and the fan air volume has been set to the value of 1 or more. The threshold condition for lowering from the upper stage to the above-mentioned arbitrary stage is that n2 or more pixels of the compound eye temperature sensor have detected a temperature of t2 (° C.) or less for a predetermined time x2 or more. , N1 < 2.

  Further, another range hood of the present invention for achieving the above object has a temperature sensor for detecting a top surface temperature of a cooking appliance, a filter for removing oil contained in oil smoke generated above the cooking appliance, and a temperature sensor. A controller for comparing the top surface temperature detected by the filter with a preset threshold temperature and changing the rotation speed of the filter in a stepwise manner, wherein the rotation speed of the filter is reduced from an arbitrary stage to a stage one stage lower. The threshold temperature t2 (° C.) at which the temperature is increased is set lower than the threshold temperature t1 (° C.) at which the rotational speed of the filter is increased from the lower stage to the arbitrary stage.

  Further, another range hood of the present invention for achieving the above object has a compound-eye temperature sensor for detecting a top surface temperature of a cooking appliance by a plurality of pixels, and removes oil contained in oil smoke generated above the cooking appliance. A filter, and a control unit that changes the rotation speed of the filter stepwise by comparing the top surface temperature of each pixel detected by the compound eye temperature sensor with a preset threshold condition, and sets the rotation speed of the filter to an arbitrary value. The threshold condition when increasing from one stage to one stage above is that n1 or more pixels of the compound eye temperature sensor detect a temperature of t1 (° C.) or more, and the rotation speed of the filter is increased by one stage. The threshold condition when lowering from the above stage to the above-mentioned arbitrary stage is that n2 or more pixels of the compound-eye temperature sensor detect a temperature of t2 (° C.) or less. At this time, n1 <n2 is there.

  Further, another range hood of the present invention for achieving the above object has a compound-eye temperature sensor for detecting a top surface temperature of a cooking appliance by a plurality of pixels, and removes oil contained in oil smoke generated above the cooking appliance. A filter, and a control unit that changes the rotation speed of the filter stepwise by comparing the top surface temperature of each pixel detected by the compound eye temperature sensor with a preset threshold condition, and sets the rotation speed of the filter to an arbitrary value. The threshold condition when increasing from one stage to one stage above is that n1 or more pixels of the compound eye temperature sensor have detected a temperature of t1 (° C.) or more for a predetermined time x1 or more, and the filter rotation speed The threshold condition for lowering the temperature from the upper stage to the arbitrary stage is that n2 or more pixels of the compound eye temperature sensor detect a temperature of t2 (° C.) or less for a predetermined time x2 or more. , When is a n1 <n2.

  According to the present invention, since the threshold temperature or the threshold condition when decreasing the air flow of the fan or the rotation speed of the filter and the threshold temperature or the threshold condition when increasing the air flow of the fan or the rotation speed of the filter are different, During cooking, the air volume of the fan and the rotation speed of the filter are not repeatedly increased and decreased, and the user does not feel troublesome.

It is a front view at the time of installing the range hood of this embodiment in a kitchen. It is a side view at the time of installing the range hood of this embodiment in a kitchen. It is a front view of the operation panel with which the range hood of this embodiment is provided. It is a block diagram of a control system of the range hood of the present embodiment. It is an operation | movement flowchart of the range hood of this embodiment. It is a figure which shows typically the detection state of the top surface temperature of a cooking appliance by a temperature sensor. It is a figure which shows typically the detection state of the top surface temperature of a cooking appliance by a temperature sensor at the time of cooking using two heat sources of a front side. It is a figure which shows typically the detection state of the top surface temperature of the cooking appliance by the temperature sensor at the time of cooking using the heat source of the back side. It is a figure which shows typically the detection state of the top surface temperature of a cooking appliance by the temperature sensor at the time of cooking using the grill of a cooking appliance.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to only the following embodiments. Each drawing is exaggerated for convenience of explanation. Therefore, the dimensional ratio of each component in each drawing is different from the actual one. In the drawings, the same elements will be denoted by the same reference symbols, without redundant description in the specification.

(Composition of range hood)
FIG. 1 is a front view when the range hood according to the present embodiment is installed in a kitchen. FIG. 2 is a side view when the range hood according to the present embodiment is installed in a kitchen.

  As shown in FIG. 1 and FIG. 2, the range hood 100 of the present embodiment is installed on a cooker 200. Range hood 100 sucks in odors and oily smokes including odor, smoke, oil, etc. generated during cooking of cooker 200 and exhausts them to the outside. The cooker 200 illustrated has three heat sources 210 (general term for three heat sources) and a grill outlet 220. In the present specification, the cooker 200 may be a cooker for gas or IH, and the heat source is a burner for a cooker for gas, a heater for a cooker for IH, Meaning respectively.

  Range hood 100 has a temperature sensor 300 for detecting the top surface temperature of cooker 200 on the lower surface on the front side on the left side of the center. The temperature sensor 300 detects the temperature of the area indicated by the dotted line in the figure. Temperature sensor 300 may be a single-eye temperature sensor or a compound-eye temperature sensor. In the case of a compound eye temperature sensor, for example, a compound eye temperature sensor formed from 64 8 × 8 pixels is used. Therefore, in the case of the monocular temperature sensor, the average value of the top surface temperature of the cooking device 200 is detected. On the other hand, in the case of the compound eye temperature sensor, the top surface temperature of the cooking device 200 is detected for each of the 64 regions. The detection of the top surface temperature by the compound eye temperature sensor will be described later in detail.

  Range hood 100 is provided with an exhaust unit 110 at an upper portion thereof. The exhaust unit 110 exhausts odor and oily smoke from the cooking device 200. The exhaust part 110 is provided with an intake port 112 for sucking oil smoke from the cooking device 200, an exhaust port 114 communicating with the outside, and an oil smoke sucked from the intake port 112 into a passage connecting the intake port 112 and the exhaust port 114 to the exhaust port 114. A fan 116 for exhausting air is provided. The fan 116 is driven by a fan motor 117. A filter (disk) 118 is provided between the intake port 112 and the fan 116 to remove oil from the oil smoke sucked through the intake port 112. The filter 118 is driven by a filter motor 119. When the fan 116 is rotating, the filter 118 also rotates. Further, a fixed (ordinary) filter that does not rotate may be provided, or a range hood without a filter may be used.

  Range hood 100 includes an operation panel 120 for instructing the operation of range hood 100 on an upper front side thereof.

  FIG. 3 is a front view of the operation panel 120 included in the range hood 100 of the present embodiment. The operation panel 120 has an operation switch 121, an air volume switch 122, an automatic air volume switch 123, a timer switch 124, an illumination switch 125, and a constant ventilation switch 126.

  The operation switch 121 is a switch for operating the range hood 100. The air volume switch 122 is a switch for manually switching the air volume of the fan 116 between low, medium, and high. The air volume automatic switch 123 is a switch for performing control to automatically switch the air volume of the fan 116 and the rotation speed of the filter 118 according to the top surface temperature of the cooking device 200 detected by the temperature sensor 300. . The timer switch 124 is a switch for setting a time for rotating the fan 116 after the completion of cooking. The illumination switch 125 is a switch for turning on / off an LED bulb that illuminates the upper surface of the cooking device 200. The constant ventilation switch 126 is a switch for operating / stopping the constant ventilation by rotating / stopping the fan 116 manually.

  FIG. 4 is a block diagram of a control system of the range hood 100 of the present embodiment. Range hood 100 has a fan 116, a fan motor 117, a filter 118, a filter motor 119, an operation panel 120, a control unit 130, and a temperature sensor 300. The control unit 130 includes a threshold temperature / threshold condition storage unit 135, and is built in the range hood 100.

  The configurations and functions of the fan 116, the fan motor 117, the filter 118, the filter motor 119, and the operation panel 120 are as described above.

  The control unit 130 uses the top surface temperature of the cooking device 200 detected by the temperature sensor 300 to gradually change the air volume of the fan 116 and the rotation speed of the filter 118. In the present embodiment, as the stage of the air flow of the fan 116, the air flow is “weak” (for example, an arbitrary stage) with the minimum air flow, and “middle” (the stage one level higher than the arbitrary stage) with the air flow larger than “low” ), Three levels of "strong" with the maximum air volume can be set. Further, the control unit 136 uses the detected top surface temperature to determine that the rotation speed of the filter 118 is “minimum” (for example, at an arbitrary stage), and that the rotation speed of the filter 118 is “medium” (arbitrary). (A step one step higher than the step) and three steps of “high” with the maximum number of revolutions can be set. The stage of the air volume of the fan 116 and the stage of the rotation speed of the filter 118 may be changed in conjunction with each other, or may be changed individually.

  The threshold temperature / threshold condition storage unit 135 provided in the control unit 130 includes a threshold temperature or a threshold condition for increasing the air volume of the fan 116 from “low” to “medium”, and the air volume of the fan 116 from “medium” to “high”. Threshold temperature or threshold condition to increase the air flow of the fan 116 from "strong" to "medium", and threshold temperature or threshold condition to reduce the air flow of the fan 116 from "medium" to "weak" Is stored. A threshold temperature or a threshold condition for increasing the rotation speed of the filter 118 from “low” to “medium”; a threshold temperature or a threshold condition for increasing the rotation speed of the filter 118 from “medium” to “high”; A threshold temperature or threshold condition for reducing the rotation speed of the filter 118 from “high” to “medium” and a threshold temperature or threshold condition for reducing the rotation speed of the filter 118 from “medium” to “low” are stored. . The threshold temperature or threshold condition stored in the threshold temperature / threshold condition storage unit 135 is used to change the fan 116 in three stages of “weak” → “medium” → “strong” → “medium” → “weak”. The four threshold temperatures or threshold conditions and the four threshold temperatures or threshold conditions for changing the filter 118 in three stages of “low” → “medium” → “high” → “medium” → “low” are not limited. . For example, the threshold temperature / threshold condition storage unit 135 may store four threshold temperatures or threshold conditions for changing the fan 116 in two stages and the filter 118 in two stages. Further, threshold temperatures or threshold conditions for setting three or more stages may be stored. Further, only one of the threshold temperature or the threshold condition for changing the stage of the fan 116 and the threshold temperature or the threshold condition for changing the stage of the filter 118 may be stored. Specific examples of the threshold temperature or the threshold condition will be described later.

(Operation of Control Unit 130)
FIG. 5 is an operation flowchart of the range hood 100 of the present embodiment. This operation flowchart is processed by the control unit 130. This operation flowchart is executed when the air volume automatic switch 123 on the operation panel 120 (see FIGS. 3 and 4) is selected.

  The control unit 130 detects the top surface temperature of the cooking device 200 with the temperature sensor 300 (S100). Next, control unit 130 compares the detected top surface temperature of cooker 200 with the threshold temperature or threshold condition stored in threshold temperature / threshold condition storage unit 135 (S110). Next, the control unit 130 switches the stage of the air volume of the fan 116 and / or the number of rotations of the filter 118 according to the comparison result between the top surface temperature and the threshold temperature or the threshold condition (S120).

  The general operation of the control unit 130 is as described above. Next, specific modes of operation of the control unit 130 will be described separately for the case of the air volume of the fan 116 and the case of the rotation speed of the filter 118. Before describing a specific mode of operation of the control unit 130, a specific example of detection of the top surface temperature of the cooking device 200 when the temperature sensor 300 is a single-eye temperature sensor and when the temperature sensor 300 is a compound-eye temperature sensor will be described. I do.

  FIG. 6 is a diagram schematically illustrating a state in which the temperature sensor 300 detects the top surface temperature of the cooking appliance 200. As described above, since the temperature sensor 300 is attached to the lower surface of the range hood 100, the top surface temperature of the cooker 200 is determined by the heat sources (burners or heaters) 210A, 210B, 210C of the cooker 200 and the outlet of the grill. 220 is detected in the area covering 220. When temperature sensor 300 is a monocular temperature sensor, the top surface temperature of cooker 200 is detected as an average value. On the other hand, when the temperature sensor 300 is a compound-eye temperature sensor, the top surface temperature of the cooking device 200 is, for example, as shown in FIG. 6, the pixels (Tij (i = 1 to 8, j = 1 to 8)). In the present embodiment, a compound eye temperature sensor having 64 pixels is exemplified, but the number of pixels may be smaller or larger.

  FIG. 7 is a diagram schematically illustrating a state in which the temperature sensor 300 detects the top surface temperature of the cooking device 200 when cooking is performed using the two heat sources (burners or heaters) 210A and 210B on the front side. is there. The temperature sensor 300 in this case is, of course, a compound eye temperature sensor. In FIG. 7, the detection temperature is higher in a region with a darker fill color in accordance with the color depth. FIG. 7 shows that the detected temperatures of the pixels T22 to T27, T32 to T37, and T42 to T47 of the temperature sensor 300 are higher than the detected temperatures of the other regions.

  FIG. 8 is a diagram schematically illustrating a state in which the temperature sensor 300 detects the top surface temperature of the cooking appliance 200 when cooking is performed using the heat source 210C on the back side. In FIG. 8 as well, the detection temperature is higher in a region with a darker fill color in accordance with the color depth. Since the heat source 210C on the back side is smaller in size and calorific value than the two heat sources 210A and 210B on the front side, it can be seen that the detected temperature is lower than that in FIG. From this figure, it can be seen that the detected temperatures of the pixels T43, T44, T53, T54, T63, and T64 of the temperature sensor 300 are higher than the detected temperatures of the other areas.

  FIG. 9 is a diagram schematically illustrating a state in which the temperature sensor 300 detects the top surface temperature of the cooking appliance 200 when cooking is performed using the grill of the cooking appliance 200. Also in FIG. 9, the region where the fill color is dark is a region where the detected temperature is higher than other regions. From this figure, it can be seen that the detected temperatures of the pixels T73 to T76 of the temperature sensor 300 are higher than the detected temperatures of other regions.

  As described above, the control unit 130 compares the top surface temperature detected by the temperature sensor 300 with the threshold temperature or the threshold condition stored in the threshold temperature / threshold condition storage unit 135, and based on the comparison result, determines whether the fan 116 Increase or decrease the level of airflow. Further, the control unit 130 increases or decreases the number of rotations of the filter 118 according to the comparison result. The threshold temperature or the threshold condition stored in the threshold temperature / threshold condition storage unit 135 is determined by trial and error so that the optimal stage is selected as the stage of the air volume of the fan 116 and / or the stage of the rotation speed of the filter 118. It has been set. For example, as shown in FIG. 7, when two heat sources 210A and 210B are used, a relatively high top surface temperature is detected by the temperature sensor 300, so that the flow rate of the fan 116 is set to “strong” and / or “High” is selected as the stage of the rotation speed of the filter 118. As shown in FIG. 8, when one heat source 210C is used, a relatively lower top surface temperature is detected than when two heat sources 210A and 210B are used. “Medium” and / or “medium” is selected as the stage of the rotation speed of the filter 118. As shown in FIG. 9, when only the grill is used, a lower top surface temperature is detected, so that the airflow level of the fan 116 is “weak” and / or the rotation speed of the filter 118 is “low”. Is selected. In the present embodiment, as described below, the stage of the air volume of the fan 116 and / or the stage of the rotation speed of the filter 118 are optimized depending on how the top surface temperature detected by the temperature sensor 300 changes. I have.

(In case of fan air volume)
Next, the operation of the control unit 130 when changing the stage of the air volume of the fan 116 (the operation processed in the steps S110 and S120 in the operation flowchart of FIG. 5) will be described in detail for modes 1 to 4. .

<Operation of Mode 1>
In the first aspect, the air volume of the fan 116 is increased or decreased using the threshold temperature stored in the threshold temperature / threshold condition storage unit 135. The threshold temperature in this embodiment is a threshold temperature t2 (° C.) at which the air flow of the fan 116 is reduced by one step from “medium” to “weak”, and the threshold temperature t2 (° C.) is one step above the air flow of the fan 116 from “weak”. It is set lower than the threshold temperature t1 (° C.) when increasing to “medium”. That is, the threshold temperature has a relationship of t2 (° C) <t1 (° C). The reason that t2 (° C.) ≧ t1 (° C.) is not satisfied is as follows. For example, when the top surface temperature of cooker 200 rises and the top surface temperature reaches t1, the air volume changes from "weak" to "medium", and then when the top surface temperature further increases and reaches t2, the air volume becomes " It changes from “medium” to “weak”. This is because the top surface temperature of the cooker 200 is thus increased, but the air volume is reduced.

  Therefore, the air volume of fan 116 does not switch from “weak” to “medium” unless the top surface temperature detected by temperature sensor 300 becomes higher than t1 (° C.). Further, the air volume of fan 116 does not switch from “medium” to “weak” unless the top surface temperature detected by temperature sensor 300 becomes lower than t2 (° C.). Therefore, the temperature zone between t1 (° C.) and t2 (° C.) is a non-sensitive temperature zone in which the air volume does not switch, and the air volume of the fan 116 does not switch. When the temperature sensor 300 is a monocular temperature sensor, the detected temperature itself is used as the top surface temperature, and when the temperature sensor 300 is a compound eye temperature sensor, the temperature detected by each of the plurality of pixels is used.

  For this reason, when the top surface temperature is stable around the threshold temperature during cooking, the air volume of the fan 116 does not increase or decrease frequently, and the user does not feel annoying. it can. More specifically, for example, when the top surface temperature is stable around t2 (° C.), the air volume is “weak” and stable, and the top surface temperature of the cooker 200 does not become t1 (° C.) or more. As long as it is not "medium". Therefore, the air volume does not repeat “weak” and “medium”. Although the case where the air volume of the fan 116 switches between "low" and "medium" has been described above, the same applies to the case where the air volume switches between "medium" and "strong". Even when switching is performed in more stages, by setting the threshold temperature to be different between the case where the air volume is increased and the case where the air volume is decreased, it is possible to prevent the air volume from being repeatedly increased and decreased.

<Operation of Mode 2>
In the first aspect, the air volume of the fan 116 is switched by comparing the top surface temperature with the threshold temperature. In the mode 2, a temporal element is further added. In this embodiment, when the top surface temperature detected by the temperature sensor 300 continues to be equal to or lower than the threshold temperature t2 (° C.) for a predetermined time x2 or more, the air volume of the fan 116 is decreased from “medium” to “weak”, and the temperature sensor 300 When the top surface temperature detected by the fan 116 is equal to or higher than the threshold temperature t1 (° C.) for a predetermined time x1 or more, the airflow of the fan 116 is increased from “weak” to “medium”. The magnitude relationship between the predetermined time x1 and the predetermined time x2 is x1 <x2.

  Therefore, the air volume of the fan 116 does not switch from “weak” to “medium” unless the top surface temperature detected by the temperature sensor 300 becomes equal to or higher than t1 (° C.) and the state is not continued for the predetermined time x1 or more. Further, the air volume of the fan 116 does not switch from “medium” to “weak” unless the top surface temperature detected by the temperature sensor 300 becomes equal to or lower than t2 (° C.) and the state is not continued for the predetermined time x2 or more. Therefore, the temperature zone between t1 (° C.) and t2 (° C.) is a dead temperature zone in which the air flow does not switch, and the times x1 and x2 are dead times in which the air flow does not switch. Since the relationship of x1 <x2 is satisfied, the airflow of the fan 116 can be increased more quickly than when the rise in the top surface temperature is decreased. By optimizing the times x1 and x2, when the temperature of the pot or the cooking material rises rapidly and a large amount of oil smoke is generated, the air volume can be rapidly increased, and the generated oil smoke can be effectively exhausted. On the other hand, when the temperature of the pot or the cooked food drops sharply and the oil smoke is drifting, the amount of air is not reduced and the oil smoke can be exhausted effectively. When the top surface temperature becomes higher than t2 (° C.) while measuring the time of x2, the measurement of the time of x2 is reset.

  For this reason, during cooking, when the top surface temperature is stable near the threshold temperature, the air volume of the fan 116 increases or decreases more than in the case of the aspect 1, and does not repeat. Can be suppressed from being annoying. Further, it is possible to prevent the air volume from being changed at the time of the temporary temperature rise and the temporary temperature fall. Although the case where the air volume of the fan 116 switches between "low" and "medium" has been described above, the same applies to the case where the air volume switches between "medium" and "strong". Even when switching in more stages, the threshold temperature is set to a different temperature when increasing or decreasing the air volume, and by optimizing the dead time, it is possible to prevent frequent increases and decreases in the air volume it can.

<Operation of Mode 3>
In the first and second aspects, the air volume of the fan 116 is switched using the threshold temperature. In the aspect 3, the air volume of the fan 116 is switched using the threshold condition stored in the threshold temperature / threshold condition storage unit 135. This embodiment is limited to a case where the temperature sensor 300 is a compound eye temperature sensor, and excludes a monocular temperature sensor. In this aspect, the threshold condition when increasing the air flow of the fan 116 from “weak” to “medium” is that n1 or more pixels of the compound eye temperature sensor detect a temperature of t1 (° C.) or more. The threshold condition for decreasing the air flow of the fan 116 from “medium” to “weak” is that n2 or more pixels of the compound eye temperature sensor detect a temperature of t2 (° C.) or less. , N1 <n2. As described above, the reason for n1 <n2 is that if the number of pixels at the time of temperature rise is reduced, a sharp rise in temperature can be immediately detected and the air volume can be raised. Further, it is preferable that n1 is a pixel number that is less than half of the total pixel number of the compound eye temperature sensor. Note that the relationship between the threshold temperatures t1 and t2 may be t1 ≠ t2 or t1 = t2.

  Specifically, out of 64 pixels from T11 to T88 shown in FIGS. 7 to 9, n1 or more pixels (for example, 30 pixels) detect the temperature of t1 (° C.) or more. Then, the air volume of the fan 116 is increased from “weak” to “medium”. On the other hand, if n2 or more pixels (for example, 40 pixels) out of the 64 pixels from T11 to T88 detect a temperature of t2 (° C.) or less, the air volume of the fan 116 is changed from “medium” to “weak”. ]. Note that n1 may be one pixel, and n2 may be a part of pixels from T11 to T88 as described above, or may be all pixels from T11 to T88.

  Therefore, the air volume of the fan 116 does not switch from “weak” to “medium” unless n1 or more pixels of the compound eye temperature sensor detect a temperature of t1 (° C.) or more. The air volume of the fan 116 does not switch from “medium” to “weak” unless n2 or more pixels of the compound eye temperature sensor detect a temperature of t2 (° C.) or less. Therefore, when the threshold value is not satisfied, the air volume of the fan 116 is not switched.

  For this reason, when the top surface temperature is stable around the threshold temperature during cooking, the air volume of the fan 116 does not increase or decrease frequently, and the user does not feel annoying. it can. Although the case where the air volume of the fan 116 switches between "low" and "medium" has been described above, the same applies to the case where the air volume switches between "medium" and "strong". Even when switching is performed in more stages, by setting different threshold conditions for the case where the air flow is increased and the case where the air flow is decreased, it is possible to prevent the air flow from being repeatedly increased and decreased. When both the conditions of “low” to “medium” and the conditions of “medium” to “low” are satisfied, the flow rate of the fan 116 from “low” to “medium” Priority.

<Operation of Aspect 4>
In the mode 3, the air volume of the fan 116 is switched by looking at the threshold condition (the number of pixels and the temperature). In the aspect 4, a temporal element is further added. In this embodiment, the threshold condition for increasing the air flow of the fan 116 from “weak” to “medium” is that n1 or more pixels of the compound eye temperature sensor detect a temperature of t1 (° C.) or more for a predetermined time x1 or more. The threshold condition for reducing the air flow of the fan 116 from “medium” to “weak” is that n2 or more pixels of the compound eye temperature sensor detect a temperature of t2 (° C.) or less for a predetermined time x2 or more. In this case, n1 <n2 and x1 <x2. Note that the relationship between the threshold temperatures t1 and t2 may be t1 ≠ t2 or t1 = t2.

  Specifically, out of 64 pixels from T11 to T88 shown in FIGS. 7 to 9, n1 or more pixels (for example, 30 pixels) detect a temperature of t1 (° C.) or more, Moreover, if the state has been continued for the predetermined time x1 or more, the air volume of the fan 116 is increased from “weak” to “medium”. On the other hand, out of the 64 pixels from T11 to T88, if n2 or more pixels (for example, 40 pixels) detect a temperature of t2 (° C.) or less, and if that state continues for a predetermined time x2 or more, The air volume of the fan 116 is reduced from “medium” to “weak”. Note that n1 may be one pixel, and n2 may be a part of pixels from T11 to T88 as described above, or may be all pixels from T11 to T88.

  Therefore, the air volume of the fan 116 does not switch from “weak” to “medium” unless n1 or more pixels of the compound-eye temperature sensor have detected a temperature of t1 (° C.) or more for a predetermined time x1 or more. Further, the air volume of the fan 116 does not switch from “medium” to “weak” unless n2 or more pixels of the compound eye temperature sensor detect a temperature of t2 (° C.) or less for a predetermined time x2 or more. Therefore, when the threshold value is not satisfied, for example, when the temperature is temporarily increased or temporarily decreased, the air volume of the fan 116 is not switched. Since the relationship of x1 <x2 is satisfied, the airflow of the fan 116 can be increased more quickly than when the rise in the top surface temperature is decreased. By optimizing the times x1 and x2, when the temperature of the pot or the cooking material rises rapidly and a large amount of oil smoke is generated, the air volume can be increased and the generated oil smoke can be effectively exhausted. On the other hand, when the temperature of the pot or the cooked food drops sharply and the oil smoke is drifting, the amount of air is not reduced and the oil smoke can be exhausted effectively.

  For this reason, when the top surface temperature is stable around the threshold temperature during cooking, the air volume of the fan 116 increases or decreases more frequently than in the case of the aspect 3, and does not repeat frequently. In addition, it is possible to suppress the user from feeling troublesome. Although the case where the air volume of the fan 116 switches between "low" and "medium" has been described above, the same applies to the case where the air volume switches between "medium" and "strong". Even when switching is performed in more stages, by setting different threshold conditions for the case where the air flow is increased and the case where the air flow is decreased, it is possible to prevent the air flow from being repeatedly increased and decreased. This effect is further enhanced if the time for switching the stages, for example, the time such as x1 and x2, can be optimized.

  Note that the control unit 130 determines that the n3 or more pixels of the temperature sensor 300 are at t2 (° C.) during a predetermined time x2 during which time is being measured to reduce the air volume of the fan 116 from “medium” to “weak”. ) When the temperature becomes higher, the measurement of the predetermined time x2 is reset.

  For example, out of 64 pixels from T11 to T88 shown in FIGS. 7 to 9, n2 or more pixels (for example, 40 pixels) detect the temperature of t2 (° C.) or less and the duration thereof When the temperature of n3 or more pixels (for example, 35 pixels) reaches a temperature higher than t2 (° C.) until the predetermined time x2 during which is measured, the measurement of the predetermined time x2 is reset. At this time, it is assumed that n2> n3. By performing such control, the increase and decrease of the air volume are not frequently repeated.

(In case of filter rotation speed)
In the above-described first to fourth aspects, the operation of the control unit 130 with respect to the air volume of the fan 116, which is performed in steps S110 and S120, has been described. Next, modes 5 to 8 in which the air volume of the fan 116 is replaced by the rotation speed of the filter 118 will be described.

<Operation of Mode 5>
In the mode 5, the rotation speed of the filter 118 is increased or decreased by using the threshold temperature stored in the threshold temperature / threshold condition storage unit 135. The threshold temperature in this embodiment is a threshold temperature t2 (° C.) at which the rotation speed of the filter 118 is reduced by one step from “medium” to “low”, and the threshold temperature at which the rotation speed of the filter 118 is increased by one step from “low”. Is set lower than the threshold temperature t1 (° C.) when increasing to “medium”. That is, the threshold temperature has a relationship of t2 (° C) <t1 (° C). The reason that t2 (° C.) ≧ t1 (° C.) is not satisfied is as follows. For example, when the top surface temperature of cooker 200 rises and top surface temperature reaches t1, the rotation speed of filter 118 changes from "low" to "medium", and then the top surface temperature further rises and reaches t2. Then, the rotation speed changes from “medium” to “low”. As described above, the rotation speed may drop even though the top surface temperature of the cooking device 200 is rising.

  Therefore, the rotation speed of the filter 118 does not switch from “low” to “medium” unless the top surface temperature detected by the temperature sensor 300 becomes higher than t1 (° C.). Further, the rotation speed of filter 118 does not switch from “medium” to “low” unless the top surface temperature detected by temperature sensor 300 becomes lower than t2 (° C.). Therefore, the temperature zone between t1 (° C.) and t2 (° C.) is an insensitive temperature zone in which the air volume does not switch, and the rotation speed of the filter 118 does not switch. When the temperature sensor 300 is a monocular temperature sensor, the detected temperature itself is used as the top surface temperature, and when the temperature sensor 300 is a compound eye temperature sensor, the temperature detected by each of the plurality of pixels is used.

  Therefore, during cooking, when the top surface temperature is stable around the threshold temperature, the rotation speed of the filter 118 does not increase or decrease frequently, and the user does not feel troublesome. Can be suppressed. More specifically, for example, when the top surface temperature is stable around t2 (° C.), the rotation speed is “low” and stable, and the top surface temperature of the cooking device 200 is higher than t1 (° C.). It will not be "medium" unless it does. For this reason, the number of rotations does not repeat "low" and "medium". Although the case where the rotation speed of the filter 118 switches between “low” and “medium” has been described above, the same applies to the case where the rotation speed switches between “medium” and “high”. Even in the case of switching at more stages, setting the threshold temperature to be different between the case where the rotation speed is increased and the case where the rotation speed is reduced can prevent frequent increase and decrease of the rotation speed, thereby reducing noise. Can be reduced.

<Operation of mode 6>
In the mode 5, the rotation speed of the filter 118 is switched by comparing the top surface temperature with the threshold temperature. In the aspect 6, a temporal element is further added. In this aspect, when the top surface temperature detected by the temperature sensor 300 continues to be equal to or lower than the threshold temperature t2 (° C.) for a predetermined time x2 or more, the rotation speed of the filter 118 is reduced from “medium” to “low”, When the top surface temperature detected by 300 is equal to or higher than the threshold temperature t1 (° C.) for a predetermined time x1 or more, the rotation speed of the filter 118 is increased from “low” to “medium”. The magnitude relationship between the predetermined time x1 and the predetermined time x2 is x1 <x2.

  Therefore, the rotation speed of the filter 118 does not switch from “low” to “medium” unless the top surface temperature detected by the temperature sensor 300 becomes equal to or higher than t1 (° C.) and the state is not continued for the predetermined time x1 or more. . In addition, the rotation speed of the filter 118 does not switch from “medium” to “low” unless the top surface temperature detected by the temperature sensor 300 becomes equal to or lower than t2 (° C.) and the state is not continued for a predetermined time x2 or more. . Therefore, the temperature zone between t1 (° C.) and t2 (° C.) is a dead temperature zone in which the air flow does not switch, and the times x1 and x2 are dead times in which the air flow does not switch. Since x1 <x2, the rise of the top surface temperature can be detected more quickly than in the case of a decrease, and the rotation speed of the filter 118 can be increased. By optimizing the time of x1 and x2, when the temperature of the pot or the cooking material rises rapidly and a large amount of oil smoke is generated, the number of rotations can be rapidly increased, and the oil component can be effectively removed from the generated oil smoke. . On the other hand, when the temperature of the pot or the cooking material drops rapidly and the oil smoke is drifting, the rotation speed is not reduced, and the oil component of the oil smoke can be effectively removed. When the top surface temperature becomes higher than t2 (° C.) while measuring the time of x2, the measurement of the time of x2 is reset.

  For this reason, during cooking, when the top surface temperature is stable near the threshold temperature, the rotation speed of the filter 118 increases or decreases, which is not repeated as in the case of the fifth embodiment, It is possible to suppress the user from feeling troublesome. Further, it is possible to prevent the rotation speed from being changed at the time of the temporary temperature rise and the temporary temperature fall. Although the case where the rotation speed of the filter 118 switches between “low” and “medium” has been described above, the same applies to the case where the rotation speed switches between “medium” and “high”. Even when switching at more stages, the threshold temperature is set to a different temperature when increasing and decreasing the rotation speed, and the insensitive time is optimized, so that the rotation speed is frequently increased and decreased. Can be prevented.

<Operation of Mode 7>
In Embodiments 5 and 6, the rotation speed of the filter 118 is switched using the threshold temperature. In the aspect 7, the rotation speed of the filter 118 is switched using the threshold condition stored in the threshold temperature / threshold condition storage unit 135. This embodiment is limited to a case where the temperature sensor 300 is a compound eye temperature sensor, and excludes a monocular temperature sensor. In this embodiment, the threshold condition when increasing the rotation speed of the filter 118 from “low” to “medium” is that n1 or more pixels of the compound eye temperature sensor detect a temperature of t1 (° C.) or more. The threshold condition for reducing the rotation speed of the filter 118 from “medium” to “low” is that n2 or more pixels of the compound eye temperature sensor detect a temperature of t2 (° C.) or less, At this time, n1 <n2. The reason why n1 <n2 is set is that if the number of pixels at the time of temperature rise is reduced, a rapid temperature rise can be immediately detected and the number of rotations can be increased. Further, it is preferable that n1 is a pixel number that is less than half of the total pixel number of the compound eye temperature sensor. Note that the relationship between the threshold temperatures t1 and t2 may be t1 ≠ t2 or t1 = t2.

  Specifically, out of 64 pixels from T11 to T88 shown in FIGS. 7 to 9, n1 or more pixels (for example, 30 pixels) detect the temperature of t1 (° C.) or more. Then, the rotation speed of the filter 118 is increased from “low” to “medium”. On the other hand, if n2 or more pixels (for example, 40 pixels) among the 64 pixels from T11 to T88 detect a temperature of t2 (° C.) or less, the rotation speed of the filter 118 is changed from “medium” to “middle”. Low ”. Note that n1 may be one pixel, and n2 may be a part of pixels from T11 to T88 as described above, or may be all pixels from T11 to T88.

  Therefore, the rotation speed of the filter 118 does not switch from “low” to “medium” unless n1 or more pixels of the compound eye temperature sensor detect a temperature of t1 (° C.) or more. Also, the rotation speed of the filter 118 does not switch from “medium” to “low” unless n2 or more pixels of the compound eye temperature sensor detect a temperature of t2 (° C.) or less. Therefore, when the threshold condition is not satisfied, the rotation speed of the filter 118 is not switched.

  Therefore, during cooking, when the top surface temperature is stable around the threshold temperature, the rotation speed of the filter 118 does not increase or decrease frequently, and the user does not feel troublesome. Can be suppressed. Although the case where the rotation speed of the filter 118 switches between “low” and “medium” has been described above, the same applies to the case where the rotation speed switches between “medium” and “high”. Even when switching is performed in more stages, different threshold conditions are set for the case where the rotational speed is increased and the case where the rotational speed is decreased, so that the increase and decrease of the rotational speed can be prevented from being repeated frequently. Note that, when the rotation speed of the filter 118 satisfies both the condition of “low” to “medium” and the condition of “medium” to “low”, “low” in the direction of increasing the rotation speed Priority is given to “medium”.

<Operation of Mode 8>
In the mode 7, the number of rotations of the filter 118 is switched based on the threshold condition (the number of pixels and the temperature). In the mode 8, a temporal element is further added. In this embodiment, the threshold condition for increasing the rotation speed of the filter 118 from “low” to “medium” is that n1 or more pixels of the compound eye temperature sensor detect a temperature of t1 (° C.) or more for a predetermined time x1 or more. The threshold condition for decreasing the rotation speed of the filter 118 from “medium” to “low” is that the temperature of n2 or more pixels of the compound eye temperature sensor is equal to or less than t2 (° C.) for a predetermined time x2 or more. That is, at this time, n1 <n2 and x1 <x2. Note that the relationship between the threshold temperatures t1 and t2 may be t1 ≠ t2 or t1 = t2.

  Specifically, out of 64 pixels from T11 to T88 shown in FIGS. 7 to 9, n1 or more pixels (for example, 30 pixels) detect a temperature of t1 (° C.) or more, Moreover, if the state is continued for the predetermined time x1 or more, the rotation speed of the filter 118 is increased from “low” to “medium”. On the other hand, out of the 64 pixels from T11 to T88, if n2 or more pixels (for example, 40 pixels) detect a temperature of t2 (° C.) or less, and if that state continues for a predetermined time x2 or more, The rotation speed of the filter 118 is reduced from “medium” to “low”. Note that n1 may be one pixel, and n2 may be a part of pixels from T11 to T88 as described above, or may be all pixels from T11 to T88.

  Therefore, the rotation speed of the filter 118 does not switch from “low” to “medium” unless n1 or more pixels of the compound-eye temperature sensor detect a temperature of t1 (° C.) or more for a predetermined time x1 or more. In addition, the rotation speed of the filter 118 does not switch from “medium” to “low” unless n2 or more pixels of the compound eye temperature sensor detect a temperature of t2 (° C.) or less for a predetermined time x2 or more. Therefore, when the threshold condition is not satisfied, for example, in the case of a temporary temperature increase or a temporary temperature decrease, the rotation speed of the filter 118 is not switched. Since x1 <x2, the rise of the top surface temperature can be detected more quickly than in the case of a decrease, and the rotation speed of the filter 118 can be increased. By optimizing the times x1 and x2, when the temperature of the pot or the cooking material rises rapidly and a large amount of oil smoke is generated, the number of rotations can be increased, and the oil component of the generated oil smoke can be effectively removed. On the other hand, when the temperature of the pot or the cooking material drops rapidly and the oil smoke is drifting, the rotation speed is not reduced, and the oil component of the oil smoke can be effectively removed.

  Therefore, during cooking, when the top surface temperature is stable around the threshold temperature, the rotation speed of the filter 118 increases or decreases more frequently than in the case of the mode 7. It can be suppressed that the user feels troublesome. Although the case where the rotation speed of the filter 118 switches between “low” and “medium” has been described above, the same applies to the case where the rotation speed switches between “medium” and “high”. Even when switching is performed in more stages, the threshold temperature is set to be different between the case where the rotational speed is increased and the case where the rotational speed is decreased, so that the increase and decrease of the rotational speed can be prevented from being repeated frequently. This effect is further enhanced if the time for switching the stages, for example, the time such as x1 and x2, can be optimized.

  Note that the control unit 130 determines that the number of n3 or more pixels of the temperature sensor 300 is equal to or smaller than t2 (time period x2) during which time is measured to decrease the rotation speed of the filter 118 from “medium” to “low”. When the temperature becomes higher than (° C.), the measurement of the predetermined time x2 is reset.

  For example, out of 64 pixels from T11 to T88 shown in FIGS. 7 to 9, n2 or more pixels (for example, 40 pixels) detect the temperature of t2 (° C.) or less and the duration thereof When the temperature of n3 or more pixels (for example, 35 pixels) reaches a temperature higher than t2 (° C.) until the predetermined time x2 during which is measured, the measurement of the predetermined time x2 is reset. At this time, it is assumed that n2> n3. By performing such control, the increase / decrease of the rotational speed is not frequently repeated.

  As described above, according to the range hood 100 of the present embodiment, the threshold temperature or the threshold condition when the air volume of the fan 116 or the rotation speed of the filter 118 is reduced and the air volume of the fan 116 or the rotation speed of the filter 118 are increased. Since the threshold temperature or the threshold condition at that time is different, the air volume of the fan 116 and the rotation speed of the filter 118 are not repeatedly increased and decreased during cooking, and the user does not feel troublesome.

  In the present embodiment, the threshold temperature t2 (° C.) for reducing the stage of the air flow of the fan 116 and the threshold temperature t2 (° C.) for decreasing the stage of the rotation speed of the filter 118 are the same. Alternatively, different temperatures may be used. The same applies to the threshold temperature t1 (° C.) for increasing the level of the air flow of the fan 116 and the threshold temperature t1 (° C.) for increasing the level of the rotation speed of the filter 118. Also, the predetermined times x1, x2 and the number of pixels n1, n2, n3 may be different between the case of the fan 116 and the case of the filter 118.

  In the claims, “increase the air flow of the fan from an arbitrary stage to an upper stage” means that if the arbitrary stage is “weak”, the air flow of the fan 116 is “weak”. To "medium", and "decreasing the airflow of the fan from an upper stage to an arbitrary stage" means to decrease the airflow of the fan 116 from "medium" to "weak". . If the arbitrary step is “medium”, the air flow of the fan 116 is increased from “medium” to “strong”, and “the air flow of the fan 116 is reduced from an upper level to an arbitrary level”. This means that the air volume of the fan 116 is reduced from “strong” to “medium”. Also, when increasing the number of pixels n1, the threshold temperature t1 (° C.), the predetermined time x1, and the airflow of the fan 116 from “medium” to “strong” when increasing the airflow of the fan 116 from “weak” to “medium” Are different from each other for the pixel number n1, the threshold temperature t1 (° C.), and the predetermined time x1. Similarly, the number of pixels n2, the threshold temperature t2 (° C.), the predetermined time x2, and the airflow of the fan 116 are reduced from “medium” to “low” when the airflow of the fan 116 is reduced from “high” to “medium”. The values of the pixel number n2, the threshold temperature t2 (° C.), and the predetermined time x2 at this time are different. These also apply to the case of the filter 118.

  As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above embodiments, and can be implemented as various forms based on the technical idea described in the claims. Needless to say, they are also within the scope of the present invention.

100 range hood,
110 exhaust part,
112 inlet,
114 exhaust port,
116 fans,
117 fan motor,
118 filters,
119 filter motor,
120 operation panel,
121 operation switch,
122 air volume switch,
123 air volume automatic switch,
124 timer switch,
125 lighting switch,
126 constant ventilation switch,
130 control unit,
135 threshold condition (threshold temperature) storage unit,
200 cookers,
210 heat sources,
220 grill outlet,
300 temperature sensor.

Claims (14)

A temperature sensor for detecting the top surface temperature of the cooker,
A fan that inhales oil smoke generated above the cooker and exhausts it outside,
A control unit that changes the air flow rate of the fan stepwise by comparing the top surface temperature detected by the temperature sensor with a preset threshold temperature,
The threshold temperature t2 (° C.) at which the air volume of the fan is reduced from an arbitrary stage to a stage one stage lower increases the air volume of the fan from the stage one stage lower to the arbitrary stage one stage higher. A range hood that is set to be lower than a threshold temperature t1 (° C.) at which the range hood is set.   The control unit reduces the air volume of the fan from the arbitrary stage to the lower stage by one stage when the ceiling surface temperature continues to be equal to or lower than the threshold temperature t2 (° C.) for a predetermined period of time x2 or more. 2. The range hood according to claim 1, wherein when the surface temperature continues to be equal to or higher than the threshold temperature t1 (° C.) for a predetermined time x1 or more, the air volume of the fan is increased from the stage one stage lower to the arbitrary stage.   The range hood according to claim 2, wherein a magnitude relationship between the predetermined time x1 and the predetermined time x2 is x1 <x2. A compound eye temperature sensor that detects the top surface temperature of the cooker with a plurality of pixels,
A fan that inhales oil smoke generated above the cooker and exhausts it outside,
A control unit that changes the airflow rate of the fan stepwise by comparing the top surface temperature of each pixel detected by the compound eye temperature sensor with a preset threshold condition,
The threshold condition when increasing the air volume of the fan from an arbitrary stage to an upper stage from an arbitrary stage is that n1 or more pixels of the compound eye temperature sensor detect a temperature of t1 (° C.) or more. The threshold condition for lowering the air flow of the fan from the upper stage to the arbitrary stage is such that n2 or more pixels of the compound eye temperature sensor detect a temperature of t2 (° C.) or less. Is that
At this time, a range hood where n1 <n2. A compound eye temperature sensor that detects the top surface temperature of the cooker with a plurality of pixels,
A fan that inhales oil smoke generated above the cooker and exhausts it outside,
A control unit that changes the airflow rate of the fan stepwise by comparing the top surface temperature of each pixel detected by the compound eye temperature sensor with a preset threshold condition,
The threshold condition when increasing the air flow of the fan from an arbitrary stage to an upper stage from an arbitrary stage is such that n1 or more pixels of the compound eye temperature sensor detect a temperature of t1 (° C.) or more for a predetermined time x1 or more. The threshold condition when the air volume of the fan is reduced from the upper stage to the arbitrary stage is as follows: n2 or more pixels of the compound eye temperature sensor are t2 (° C.) or less. Temperature has been detected for a predetermined time x2 or more,
At this time, a range hood where n1 <n2. During the predetermined time x2 in which the air volume of the fan is to be reduced from the upper stage to the arbitrary stage, the control unit determines that n3 or more pixels of the compound eye temperature sensor are at t2 (° C). ) Resetting the measurement of the predetermined time x2 when the temperature becomes higher;
At this time, the range hood according to claim 5, wherein n2> n3.   The range hood according to any one of claims 4 to 6, wherein n2 is all pixels of the compound eye temperature sensor. A temperature sensor for detecting the top surface temperature of the cooker,
A filter for removing oil contained in oil smoke generated above the cooker,
A control unit that compares the top surface temperature detected by the temperature sensor with a preset threshold temperature and changes the rotation speed of the filter in a stepwise manner,
The threshold temperature t2 (° C.) at which the rotation speed of the filter is reduced from an arbitrary stage to one lower stage is when the rotation speed of the filter is increased from the one lower stage to the arbitrary stage. Range hood set lower than the threshold temperature t1 (° C.).   The control unit, when the top surface temperature continues to be equal to or lower than the threshold temperature t2 (° C.) for a predetermined time x2 or more, reduces the rotation speed of the filter from the arbitrary stage to the one-stage lower stage, 9. The range according to claim 8, wherein when the top surface temperature continues to be equal to or higher than the threshold temperature t1 (° C.) for a predetermined time x1 or more, the rotation speed of the filter is increased from the stage one stage lower to the arbitrary stage. hood.   The range hood according to claim 9, wherein a magnitude relationship between the predetermined time x1 and the predetermined time x2 is x1 <x2. A compound eye temperature sensor that detects the top surface temperature of the cooker with a plurality of pixels,
A filter for removing oil contained in oil smoke generated above the cooker,
A control unit that changes the rotation speed of the filter stepwise by comparing the top surface temperature of each pixel detected by the compound eye temperature sensor with a preset threshold condition,
The threshold condition when increasing the number of rotations of the filter from an arbitrary stage to an upper stage is that n1 or more pixels of the compound eye temperature sensor detect a temperature of t1 (° C.) or more. And the threshold condition when the number of rotations of the filter is reduced from the upper stage to the arbitrary stage is that the temperature of n2 or more pixels of the compound eye temperature sensor is t2 (° C.) or less. That it is detecting
At this time, a range hood where n1 <n2. A compound eye temperature sensor that detects the top surface temperature of the cooker with a plurality of pixels,
A filter for removing oil contained in oil smoke generated above the cooker,
A control unit that changes the rotation speed of the filter stepwise by comparing the top surface temperature of each pixel detected by the compound eye temperature sensor with a preset threshold condition,
The threshold condition when increasing the rotation speed of the filter from an arbitrary stage to an upper stage is as follows: n1 or more pixels of the compound eye temperature sensor detect a temperature of t1 (° C.) or more for a predetermined time x1 or more. The threshold condition when the number of rotations of the filter is reduced from the upper stage to the arbitrary stage is n2 or more pixels of the compound eye temperature sensor at t2 (° C.). The following temperature is detected for a predetermined time x2 or more,
At this time, a range hood where n1 <n2. During the predetermined time x2 in which the number of rotations of the filter is to be reduced from the upper stage to the arbitrary stage, the number of n3 or more pixels of the compound eye temperature sensor is t2 ( When the temperature becomes higher than (° C), the measurement of the predetermined time x2 is reset,
13. The range hood according to claim 12, wherein n2> n3.   The range hood according to any one of claims 11 to 13, wherein n2 is all pixels of the compound eye temperature sensor.