Range hood

Abstract

The invention provides a range hood which can automatically start to drive a blower when a heating cooker is in a heating state and can prevent the blower from automatically starting to operate due to false detection when the heating cooker is not in the heating state. The range hood is provided with a blower (22) and a temperature sensor (25) for detecting the temperature above a heating cooker (10), and has an automatic operation mode. When the temperature gradient of the temperature detected by the temperature sensor (25) is equal to or greater than a first threshold value (alpha1) indicating a temperature rise state, and the temperature detected by the temperature sensor (25) is equal to or greater than a set first predetermined temperature (T1), the automatic operation mode automatically starts driving the blower (22) when predetermined conditions are satisfied.

Description

Technical Field

[0001] The present invention relates to a range hood for exhausting fumes generated by cooking with a cooking device to the outside of the room or the like. Background Art

[0002] A range hood is often used to start driving a blower when a cooking device starts to be heated to start cooking, so as to exhaust fumes generated by the cooking device to the outside, etc. Therefore, a range hood is proposed that automatically starts and stops driving the blower when the cooking device starts to be heated to start cooking.

[0003] For example, as disclosed in Patent Document 1, a range hood is proposed in which a device for detecting the temperature above a heating cooker is provided on a smoke collecting hood body, and a blower is automatically started and stopped according to the detected temperature.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2009-121751

[0005] In such a range hood, the driving of the blower is started only based on the temperature above the cooking device. Therefore, even if the cooking device is not used for cooking, it is mistakenly detected that the cooking device is heating, thereby starting the driving of the blower.

[0006] For example, if food that has been heated by a heater other than a cooking device such as a microwave oven is moved to a cooking device, the temperature of the cooking device rises due to the food, so the range hood determines that the cooking device is heating and automatically starts driving the blower. However, the cooking device is not actually heated, so there is no need to drive the blower, and electricity is consumed unnecessarily. Summary of the invention

[0007] The present invention is completed to solve the above-mentioned problems, and its purpose is to provide a range hood that automatically starts driving the blower when the heating cooker is in the heating state, thereby preventing the blower from automatically starting to drive due to erroneous detection when the heating cooker is not in the heating state.

[0008] The range hood of the present invention comprises an air blower and a temperature sensor for detecting the temperature above a heating cooker, and the range hood has an automatic operation mode. The automatic operation mode drives the air blower when the temperature gradient of the detected temperature of the temperature sensor satisfies prescribed conditions after the temperature gradient of the detected temperature of the temperature sensor is above a first threshold indicating a temperature rise state and the detected temperature of the temperature sensor is above a set first prescribed temperature.

[0009] In the range hood of the present invention, the predetermined condition may be that the temperature gradient of the temperature detected by the temperature sensor becomes equal to or greater than a second threshold value indicating a temperature increase state.

[0010] With this configuration, when the cooking device is in the heating state, the temperature gradient of the temperature detected by the temperature sensor is equal to or higher than the second threshold value and the predetermined condition is satisfied, so that the fan can be automatically started to be driven.

[0011] In addition, when the cooked food is moved to the cooking device when the cooking device is not in the heating state, since the cooking device is not in the heating state, it will not cause a continuous temperature rise, and the temperature gradient of the detected temperature of the temperature sensor is below the second threshold value and does not meet the specified conditions, so the air blower 22 will not start to be driven automatically. Therefore, it is possible to prevent the air blower from automatically starting to be driven due to false detection when the cooking device is not in the heating state, and the air blower will not be driven unnecessarily.

[0012] In the range hood of the present invention, the predetermined condition may be that the temperature gradient of the temperature detected by the temperature sensor becomes equal to or greater than a second threshold value indicating a temperature rise state during a set predetermined time.

[0013] With this configuration, a continuous temperature rise does not occur when the cooking device is not in the heating state, and thus it is possible to prevent the blower from automatically starting to drive due to erroneous detection when the cooking device is not in the heating state.

[0014] In the range hood of the present invention, the predetermined condition may be that the temperature gradient of the temperature detected by the temperature sensor becomes equal to or higher than a second threshold value indicating a temperature rise state for a predetermined number of times or more.

[0015] With this configuration, a continuous temperature rise does not occur when the cooking device is not in the heating state, and thus it is possible to prevent the blower from automatically starting to drive due to erroneous detection when the cooking device is not in the heating state.

[0016] In the range hood of the present invention, the predetermined condition may be that the temperature gradient of the temperature detected by the temperature sensor does not continuously fall below a second threshold value indicating a temperature rise state during a set predetermined time.

[0017] By adopting this structure, even if the temperature temporarily drops in the middle of the temperature rise after entering the heating state for some reason, if the temperature gradient of the detected temperature of the above-mentioned temperature sensor is not continuously lower than the set second threshold value, the blower can be automatically started to be driven, thereby preventing the blower from automatically starting to be driven due to false detection.

[0018] In the range hood of the present invention, the following range hood can be formed: the above-mentioned specified condition is that the temperature gradient of the detected temperature of the above-mentioned temperature sensor is discontinuously lower than the second threshold value indicating the temperature rising state, and the temperature gradient of the detected temperature of the above-mentioned temperature sensor becomes above the second threshold value more than the specified number of times.

[0019] By adopting this structure, even if the temperature temporarily drops in the middle of the temperature rise after entering the heating state for some reason, if the temperature gradient of the detected temperature of the above-mentioned temperature sensor is not continuously lower than the set second threshold value, the blower can be automatically started to be driven, which can prevent the drive from being unable to start due to false detection.

[0020] In the range hood of the present invention, the following range hood can be formed: in the above-mentioned automatic operation mode, when the temperature gradient of the detected temperature of the above-mentioned temperature sensor exceeds the third threshold value indicating the temperature rise state for a prescribed number of times in the judgment of the above-mentioned prescribed conditions, the above-mentioned air supply fan is driven, and the above-mentioned third threshold value is a temperature rise threshold value that is higher than the second threshold value indicating the temperature rise state used under the prescribed conditions.

[0021] With this structure, when the cooking device is in a heating state but the temperature of the cooking device detected by the temperature sensor repeatedly experiences a sharp rise and drop in temperature, and the temperature cannot be stably detected and the prescribed conditions are not met, the blower can be automatically started to be driven.

[0022] In the range hood of the present invention, the following range hood can be formed: the above-mentioned automatic operation mode has a third specified temperature higher than the above-mentioned first specified temperature, and in the judgment of the above-mentioned specified conditions, when the temperature gradient of the detected temperature of the above-mentioned temperature sensor exceeds the above-mentioned third threshold value that has been set, the temperature before the temperature rise is stored, and in a state where the stored temperature this time exceeds the last stored temperature, or in a state where the state where the detected temperature of the above-mentioned temperature sensor is higher than the above-mentioned third specified temperature continues, when the stored temperature this time exceeds the last stored temperature for a specified number of times, the above-mentioned air supply fan is driven.

[0023] With this structure, even when the cooking device is in the heating state, but the temperature of the cooking device detected by the temperature sensor repeatedly experiences a sharp rise and drop in temperature, and the temperature cannot be stably detected and the prescribed conditions are not met, the blower can be automatically started to be driven.

[0024] Furthermore, when the heated food is moved onto the cooking device without putting the cooking device into the heating state, it is possible to prevent the blower 22 from automatically starting to be driven when the temperature on the cooking device rises or drops sharply due to stirring the food or removing the cover of the food.

[0025] The range hood of the present invention can have the following structures.

[0026] (1) A range hood comprising an air blower and a temperature sensor for detecting the temperature above a cooking device, characterized in that the range hood has an automatic operation mode, wherein the automatic operation mode drives the air blower when the temperature gradient of the temperature detected by the temperature sensor satisfies a prescribed condition after the temperature gradient of the temperature detected by the temperature sensor is above a first threshold indicating a temperature rise state and the temperature detected by the temperature sensor is above a set first prescribed temperature.

[0027] (2) The range hood according to (1), characterized in that:

[0028] The predetermined condition is that a temperature gradient of a temperature detected by the temperature sensor becomes equal to or greater than a second threshold value indicating a temperature rising state.

[0029] (3) The range hood according to (1) or (2), characterized in that:

[0030] The predetermined condition is that, during a set predetermined time period, a temperature gradient of a temperature detected by the temperature sensor becomes equal to or greater than a second threshold value indicating a temperature rising state.

[0031] (4) The range hood according to any one of (1) to (3), characterized in that:

[0032] The predetermined condition is that the temperature gradient of the temperature detected by the temperature sensor becomes equal to or higher than a second threshold value indicating a temperature rising state for a predetermined number of times or more.

[0033] (5) The range hood according to any one of (1) to (4), characterized in that:

[0034] The predetermined condition is that the temperature gradient of the temperature detected by the temperature sensor does not continuously fall below a second threshold value indicating a temperature rising state during a set predetermined time period.

[0035] (6) The range hood according to any one of (1) to (5), characterized in that:

[0036] The predetermined condition is that the temperature gradient of the temperature detected by the temperature sensor does not continuously fall below a second threshold indicating a temperature rise state, and the temperature gradient of the temperature detected by the temperature sensor is equal to or greater than the second threshold for a predetermined number of times or more.

[0037] (7) The range hood according to any one of (1) to (6), characterized in that:

[0038] In the automatic operation mode, when the temperature gradient of the detected temperature of the temperature sensor exceeds the third threshold indicating a temperature rise state for a specified number of times in the judgment of the specified conditions, the blower is driven, and the third threshold is a threshold of temperature rise that is higher than the second threshold indicating a temperature rise state used under the specified conditions.

[0039] (8) The range hood according to any one of (1) to (7), characterized in that:

[0040] The automatic operation mode has a third specified temperature higher than the first specified temperature. In the determination of the specified conditions, when the temperature gradient of the temperature detected by the temperature sensor exceeds the third threshold value that has been set, the state in which the temperature stored this time exceeds the temperature stored last time, or the temperature before the temperature rises, is stored. When the state in which the temperature detected by the temperature sensor is higher than the third specified temperature continues, and when the temperature stored this time exceeds the temperature stored last time for a specified number of times, the blower is driven.

[0041] According to the range hood of the present invention, the fan can be automatically started to be driven when the cooking device is in the heating state, and the fan can be prevented from being automatically started to be driven due to erroneous detection when the cooking device is not in the heating state. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic explanatory diagram showing an embodiment of a heating cooker and a range hood according to the present invention.

[0043] Figure 2 This is a graph showing changes in the detected temperature in a normal temperature state during cooking according to the present invention.

[0044] Figure 3 This is a graph showing changes in the detected temperature when the heated food of the present invention is moved to the heating cooker.

[0045] Figure 4 This is a graph showing changes in the detected temperature in an abnormal temperature state during cooking according to the present invention.

[0046] Figure 5 This is a graph showing changes in the detected temperature when the flame of the heating cooker of the present invention is directly detected.

[0047] Figure 6 This is a flowchart showing the first action of automatically starting to drive the blower of the present invention.

[0048] Figure 7 This is a flowchart showing the second action of automatically starting to drive the air blower of the present invention.

[0049] Figure 8 This is a flowchart showing the third action of automatically starting to drive the air blower of the present invention.

[0050] Fig. 9 This is a flowchart showing the fourth action of automatically starting to drive the air blower of the present invention.

[0051] Fig.10 This is a flow chart showing the operation of automatically stopping driving of the blower of the present invention.

[0052] Description of Reference Numerals

[0053] 10…heating cooker; 11…heating unit; 12…switch; 13…heating unit control unit; 14…transmitting unit; 20…range hood; 21…smoke hood body; 22…air blower; 23…operation switch; 24…control unit; 25…temperature sensor. DETAILED DESCRIPTION

[0054] Embodiments of the range hood of the present invention will be described.

[0055] based on Figure 1 The embodiments of the heating cooker and the range hood are described. Figure 1 It is a schematic explanatory diagram showing an embodiment of a heating cooker and a range hood.

[0056] The heating cooker 10 includes a heating unit 11, a switch 12, a heating unit control unit 13, and a transmitting unit 14. By operating the switch 12, a heating signal and a stop signal are transmitted to the heating unit control unit 13, so that the heating unit control unit 13 heats and stops the heating unit 11, and the heating signal and the stop signal are transmitted by infrared rays from the transmitting unit 14. By operating the switch 12, the heating amount of the heating unit 11 can be adjusted.

[0057] The heating cooker 10 is a gas stove, an IH stove, or the like.

[0058] The range hood 20 comprises: a fume hood body 21, a blower 22, an operation switch 23, a control unit 24, a temperature sensor 25 and a receiving unit 26. By driving the blower 22, oil fume generated by heating and cooking is captured in the fume hood body 21 and discharged to the outside.

[0059] The operation switch 23 is manually operated to send an operation signal and a stop signal to the control unit 24, so that the control unit 24 drives and stops the blower 22 to start and stop the operation of the range hood. The air supply volume control signal is sent from the operation switch 23 to the control unit 24 to change the rotation speed of the blower 22 to control the air supply volume, so that the range hood 20 can be manually operated.

[0060] The receiving unit 26 receives the heating signal and the stop signal sent by the sending unit 14 of the heating cooker 10 and sends it to the control unit 24, thereby the control unit 24 drives and stops the blower 22 to start and stop the operation of the range hood 20, so that the range hood 20 can be operated by the linkage operation with the heating cooker 10.

[0061] The temperature sensor 25 always detects the temperature above the heating cooker 10, and the detected temperature is sent to the control unit 24. The control unit 24 performs automatic operation control described later based on the detected temperature to automatically start and stop the range hood 20. That is, the control unit 24 has an automatic operation mode.

[0062] The temperature sensor 25 is a compound eye temperature sensor, which detects the temperature of each block (pixel) into which the entire upper surface of the heating cooker 10 is divided, and the highest temperature of the block with the highest temperature is set as the detected temperature. Alternatively, the average temperature of each block is captured as the temperature of the block, and the highest temperature among the average temperatures is set as the detected temperature.

[0063] In addition, the temperature sensor 25 can be a single-eye temperature sensor, and the maximum temperature or the average temperature can be used as the detection temperature.

[0064] In addition, as the temperature sensor 25 , for example, an infrared sensor, an infrared camera, etc. can be used.

[0065] The temperature sensor 25 may also be installed at a location other than the fume hood main body 21 .

[0066] Next, an example of the automatic operation mode of the range hood 20 will be described.

[0067] The temperature above the cooking device 10 is heated by heating the heating portion 11 so that the detected temperature of the temperature sensor 25 is as follows: Figure 2 That is, the temperature gradually rises to a temperature higher than the room temperature from the time when the heating unit 11 of the heating cooker 10 is heated, and gradually decreases to the room temperature from the time when the heating unit 11 is stopped.

[0068] A first prescribed temperature T1 higher than the indoor temperature, a second prescribed temperature T2 higher than the first prescribed temperature T1, a third prescribed temperature T3 higher than the second prescribed temperature T2, and a temperature gradient are set in the control unit 24, and in the embodiment, a first threshold value α1, a second threshold value α2, and a third threshold value α3 of the temperature rise gradient α of the temperature detected by the temperature sensor 25 are set.

[0069] The first predetermined temperature T1 is a reference temperature for starting the driving of the blower 22, and the second predetermined temperature T2 is a temperature for stopping the driving of the blower 22. The third predetermined temperature T3 is a reference temperature for determining a rapid temperature rise.

[0070] In an embodiment, the first specified temperature T1 is preferably set to be higher than the detection temperature of the human hand by the sensor 25. In an embodiment, when the heating cooker 10 is a gas stove or an IH stove, the detection temperature of the human hand by the temperature sensor 25 is set to 30°C, and the average value for 2 seconds is set to 35°C.

[0071] The second predetermined temperature T2 is set to 50° C. when the cooking device 10 is a gas stove, and is set to 40° C. when the cooking device 10 is an IH stove.

[0072] The third set temperature T3 is set to 80°C.

[0073] That is, since the IH stove does not use fire, the temperature during heating and cooking is less likely to rise compared to a gas stove that uses fire, and therefore the second predetermined temperature T2 is set higher in the case of a gas stove than in an IH stove.

[0074] The temperature rise gradient α refers to the amount of temperature change that rises per constant time, and the first threshold α1 refers to the temperature rise gradient that serves as a reference for control, and is the amount of temperature change that rises that serves as a reference for control. The constant time changes according to the threshold used in the judgment, thereby enabling a more accurate judgment. The first threshold α1 is a value for judging whether normal heating cooking has been performed, so it is a value that represents the temperature rise state of detecting a temperature rise during a constant time, and is preferably set to the minimum temperature change (greater than 0) generated when the heating cooker 10 is used. However, if it is too low, it is also easy to be reflected in the slight temperature change caused by other than heating. Therefore, in the embodiment, the first threshold α1 is set to make the average temperature of 30 seconds rise by 0.1°C or more than the average temperature of 30 seconds 10 seconds ago.

[0075] The second threshold value α2 is a value for judging whether normal heating cooking has been performed, so it is a value indicating a temperature rise state, and is preferably set to the minimum temperature change generated when the heating cooker 10 is used. On the other hand, by setting a condition higher than the first threshold value α1, the accuracy of the heating judgment can be improved. Therefore, in the embodiment, the second threshold value α2 is set to make the average temperature for 3 seconds rise by more than 0.5°C compared with the average temperature for 3 seconds 1 second ago.

[0076] The third threshold value α3 is a value for judging a sharp temperature rise, and is therefore a value indicating a temperature rise state. It is preferably greater than the temperature change produced during normal use of the heating cooker 10. In addition, it is preferably a threshold value for temperature rise that is higher than the second threshold value. Therefore, the third threshold value α3 is set so that the average temperature for 3 seconds increases by more than 1°C compared to the average temperature for 3 seconds 1 second ago.

[0077] The operation of the control unit 24 automatically starting to drive the air blower 22 will be described.

[0078] The control unit 24 always calculates the temperature increase gradient α of the temperature detected by the temperature sensor 25 .

[0079] In the embodiment, the temperature rise gradient α of the temperature detected by the temperature sensor 25 is repeatedly calculated based on the average value of the temperature detected at the constant time and the average value of the temperature detected at the constant time starting before the constant time.

[0080] The control unit 24 determines whether the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the set first threshold value α1. When it is determined that the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the set first threshold value α1, it determines whether the detected temperature of the temperature sensor 25 is above the set first prescribed temperature T1. After it is determined that the detected temperature of the temperature sensor 25 is above the set first prescribed temperature T1, the air blower 22 is automatically started to be driven when the temperature rise gradient α of the detected temperature of the temperature sensor 24 satisfies the prescribed conditions.

[0081] In addition, it is also possible to determine whether the detected temperature of the temperature sensor 25 is above the set first specified temperature T1. When it is determined that the detected temperature of the temperature sensor 25 is above the first specified temperature T1, it is determined whether the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the set first threshold value α1. After it is determined that the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the set first threshold value α1, the air blower 22 is automatically started to be driven when the temperature rise gradient α of the detected temperature of the temperature sensor 24 meets the specified conditions.

[0082] That is, after the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the set first threshold α1 and the detected temperature of the temperature sensor 24 is above the first specified temperature T1, the control unit 24 automatically starts driving the blower 22 when the temperature rise gradient α of the detected temperature of the temperature sensor 24 satisfies the specified conditions.

[0083] Whether the detected temperature of the temperature sensor 25 is equal to or higher than the first predetermined temperature T1 may be determined by the detected temperature at the determination time, or by the average value of the detected temperature of the temperature sensor 25 exceeding (falling below) a predetermined time.

[0084] According to the automatic operation mode of the present invention, when the heating cooker 10 is in the heating state for heating cooking, the temperature rise gradient α of the temperature detected by the temperature sensor 25 is greater than the set first threshold value α1 and the temperature detected by the temperature sensor 25 is greater than the first specified temperature T1. Then, the temperature of the heating cooker 10 rises due to heating, so the temperature rise gradient α of the temperature detected by the temperature sensor 25 satisfies the specified conditions. Therefore, if the heating cooker 10 is in the heating state, the air blower 22 can be automatically started to be driven. The heating state of the heating cooker 10 refers to a state in which flames are generated by ignition when the heating cooker 10 is a gas stove, and a state in which heat is generated by power supply when the heating cooker 10 is an IH stove.

[0085] Even when the temperature rise gradient α of the temperature detected by the temperature sensor 25 is above the set first threshold value α1 and the temperature detected by the temperature sensor 25 is above the first specified temperature T1, the blower 22 is not automatically started to be driven when the temperature rise gradient α of the temperature detected by the temperature sensor 25 does not meet the specified conditions thereafter. This prevents the blower 22 from automatically starting to be driven due to false detection when the cooking device 10 is not in the heating state.

[0086] For example, when the cooked food is moved to the heating controller 10 which is not in the heating state, the temperature of the heating cooker 10 rises shortly after the movement, and it is often judged that the temperature rise gradient α of the detection temperature of the temperature sensor 25 is above the set first threshold value α1, and the detection temperature of the temperature sensor 25 is above the first specified temperature T1. However, the heating cooker 10 is not in the heating state and is not heated, so it will not cause a continuous temperature rise. After that, the temperature of the heating cooker 10 will not rise, so the temperature rise gradient α of the detection temperature of the temperature sensor 25 will not meet the specified conditions, and the air blower 22 will not start to drive automatically. Therefore, it is possible to prevent the air blower 22 from automatically starting to drive due to false detection when the heating cooker 10 is not in the heating state.

[0087] Next, the prescribed conditions of the temperature increase gradient α of the temperature detected by the temperature sensor 25 will be described.

[0088] Since the temperature rise gradient α of the detected temperature of the temperature sensor 25 becomes above the set first threshold value α1 and the detected temperature of the temperature sensor 25 becomes above the set first prescribed temperature T1 when the heating cooker 10 is in the heating state for heating cooking, the air blower 22 can be automatically started to be driven by judging that the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the set first threshold value α1 and the detected temperature of the temperature sensor 25 is above the set first prescribed temperature T1. However, there is a situation where the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the set first threshold value α1 and the detected temperature of the temperature sensor 25 is above the set first prescribed temperature T1 when the heating cooker 10 is not in the heating state. In this case, it is unnecessary to start driving the air blower 22.

[0089] For example, when a heated food such as a pot is moved to the heating cooker 10 which is not in the heated state, the temperature detected by the temperature sensor 25 is as follows: Figure 3 As shown in the figure, there is a case where the temperature rise gradient α of the detected temperature becomes equal to or greater than the first threshold α1 and the detected temperature becomes equal to or greater than the first predetermined temperature T1, in which case the blower 22 automatically starts driving.

[0090] Therefore, after the temperature rise gradient α is above the set first threshold value α1 and the detected temperature detected by the temperature sensor 25 is above the set first specified temperature T1, the present invention automatically starts driving the blower 22 when the temperature rise gradient α of the detected temperature by the temperature sensor 25 satisfies the specified conditions, and does not automatically start driving the blower 22 when the specified conditions are not satisfied. This can prevent the blower 22 from starting to be driven unnecessarily due to false detection when the cooking device 10 is not in a heating state.

[0091] A first embodiment of the predetermined conditions will be described.

[0092] This embodiment prevents the blower 22 from automatically starting to drive due to erroneous detection caused by a temperature rise when the cooking device 10 is not in the heating state.

[0093] For example, when the cooked food is moved to the heating cooker 10, Figure 3 As shown, the detected temperature of the temperature sensor 25 rises to above the first specified temperature T1 shortly after the movement, and the temperature rise gradient α of the detected temperature of the temperature sensor 25 becomes above the first threshold value α1, but since the heating cooker 10 is not in a heating state, it will not cause a continuous temperature rise, and the temperature gradually decreases as time passes.

[0094] When the heating cooker 10 is in the heating state for heating cooking, Figure 2 As shown, after the temperature rise gradient α of the detection temperature of the temperature sensor 25 is satisfied to be above the set first threshold value α1, and the detection temperature of the temperature sensor 25 is above the set first specified temperature T1, the detection temperature of the temperature sensor 25 continues to rise due to heating, so that the temperature rise gradient α of the detection temperature of the temperature sensor 25 is above the second threshold value α2.

[0095] Focusing on this situation, after judging that the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the first threshold value α1 and the detected temperature of the temperature sensor 25 is above the first prescribed temperature T1, when the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the second threshold value α2, it is assumed that the temperature rise gradient α satisfies the prescribed conditions.

[0096] That is, the predetermined condition is that the temperature rise gradient α of the temperature detected by the temperature sensor 25 becomes equal to or greater than the second threshold value α2.

[0097] With this configuration, when the cooking device 10 is in the heating state for cooking, the temperature rise gradient α of the temperature detected by the temperature sensor 25 is equal to or greater than the second threshold α2 and satisfies the prescribed condition, so the blower 22 can be automatically started to be driven.

[0098] In addition, when the cooked food is moved to the cooking device 10 when the cooking device 10 is not in the heating state, since it is not heated, it will not cause a continuous temperature rise. The temperature rise gradient α of the detected temperature of the temperature sensor 25 is less than the second threshold value α2 and does not meet the specified conditions. Therefore, the air blower 22 will not start driving automatically, thereby preventing the air blower from automatically starting driving due to false detection when the cooking device 10 is not in the heating state.

[0099] A second embodiment of the predetermined condition will be described.

[0100] This embodiment, like the first embodiment, prevents the blower from automatically starting to drive due to erroneous detection caused by a temperature rise when the cooking device is not in the heating state.

[0101] When the predetermined condition is that the temperature rise gradient α of the temperature detected by the temperature sensor 25 is equal to or greater than the second threshold value, the blower 22 may automatically start driving due to erroneous detection.

[0102] For example, when the heated food is moved to the cooking device 10 when the cooking device 10 is not in the heating state, if the food is stirred or the lid of the food is removed, the temperature of the cooking device 10 rises even if no heating is performed, and the temperature rise gradient α of the temperature detected by the temperature sensor 25 temporarily becomes greater than the second threshold value α2, satisfying the specified conditions, and the blower 22 starts to be driven automatically.

[0103] In order to solve this problem, the predetermined condition is set such that the temperature rise gradient α of the temperature detected by the temperature sensor 25 becomes equal to or greater than a set second threshold value α2 during a set predetermined time.

[0104] According to this structure, the air blower 22 starts to be driven automatically when the temperature rise gradient α of the temperature detected by the temperature sensor 25 is above the second threshold value α2 during the prescribed time. Therefore, when the heating cooker 10 is not in the heating state and no heating is performed, the temperature will not continue to rise. The time when the temperature rise gradient α of the temperature detected by the temperature sensor 25 becomes above the second threshold value α2 is shorter than the prescribed time. Therefore, it is possible to prevent the air blower 22 from automatically starting to be driven due to false detection when the heating cooker 10 is not in the heating state.

[0105] That is, the longer the prescribed time is, the more it is possible to prevent the automatic driving of the blower 22 from starting due to erroneous detection. On the other hand, if the prescribed time is long, it takes time to start the automatic driving of the blower 22. Considering both situations, the prescribed time is set to 10 seconds in the embodiment.

[0106] For example, when the heated food is moved to the heating cooker 10 without being in the heating state, and the food is stirred or the cover of the food is removed, the temperature on the heating cooker 10 may rise even if the food is not heated. In such a case, the temperature rises at the time of stirring or removing the cover, but the temperature does not rise thereafter, and a continuous temperature rise does not occur. Therefore, during the predetermined time, the temperature rise gradient α of the temperature detected by the temperature sensor 25 does not continuously become more than the second threshold value α2, thereby preventing the blower 22 from automatically starting to drive due to false detection.

[0107] The temperature detection may be performed continuously at all times during the predetermined time period, or may be performed at regular intervals.

[0108] A third embodiment of the predetermined condition will be described.

[0109] This embodiment, like the first and second embodiments, prevents the blower from automatically starting to drive due to erroneous detection caused by a temperature rise when the cooking device is not in the heating state.

[0110] When the predetermined condition is that the temperature rise gradient α of the temperature detected by the temperature sensor 25 is equal to or greater than the second threshold value, the blower 22 may automatically start driving due to erroneous detection.

[0111] For example, when the heated food is moved to the cooking device 10 when the cooking device 10 is not in the heating state, if the food is stirred or the lid of the food is removed, the temperature of the cooking device 10 rises even if no heating is performed, and the temperature rise gradient α of the temperature detected by the temperature sensor 25 temporarily becomes greater than the second threshold value α2, satisfying the specified conditions, and the blower 22 starts to be driven automatically.

[0112] In order to solve this problem, the predetermined condition is set such that the temperature rise gradient α of the temperature detected by the temperature sensor 25 becomes equal to or greater than the set second threshold value α2 for a predetermined number of times or more.

[0113] According to this structure, when the temperature rise gradient α of the temperature detected by the temperature sensor 25 becomes greater than the set second threshold value α2 for more than a prescribed number of times in a row, the blower 22 starts to drive automatically. When it does not become greater than the second threshold value α2 for more than a prescribed number of times in a row, the blower 22 does not start to drive automatically. Therefore, it is possible to prevent the blower 22 from starting to drive automatically due to erroneous detection caused by temperature rise when the cooking device 10 is not in a heating state and no heating is being performed.

[0114] For example, when the heated food is moved to the heating cooker 10 without being in the heating state, or when the food is stirred or the cover of the food is removed even if the food is not heated by the heating cooker 10, the temperature on the heating cooker 10 may rise. In such a case, the temperature rises at the time of stirring or removing the cover, but the temperature does not rise thereafter, and a continuous temperature rise does not occur. Therefore, the temperature rise gradient α of the temperature detected by the temperature sensor 25 does not continuously become more than the second threshold value α2. Therefore, the temperature rise gradient α of the temperature detected by the temperature sensor 25 does not continuously become more than the second threshold value α2 for more than a predetermined number of times. Since the predetermined condition is not satisfied, the blower 22 does not automatically start driving.

[0115] Therefore, when the cooking device 10 is not in the heating state and is not heating, it is possible to prevent the blower 22 from automatically starting to drive due to erroneous detection caused by a temperature rise.

[0116] A fourth embodiment of the prescribed conditions will be described.

[0117] When the heating cooker 10 is in the heating state, the detected temperature of the temperature sensor 25 changes as shown in FIG. Figure 4As shown, there is a possibility that due to some reasons, for example, the heating cooker 10 is heated with a low fire, the temperature rise is unstable, and in the middle of the temperature rise after entering the heating state, as shown in FIG. Figure 4 In this case, the temperature rise gradient α of the temperature detected by the temperature sensor 25 is lower than the second threshold α2, and the blower 22 cannot be automatically started to be driven.

[0118] To solve this problem, in this embodiment, the predetermined condition is that the temperature rise gradient α of the temperature detected by the temperature sensor 25 does not continuously fall below the set second threshold value α2 during the set predetermined time. In this embodiment, the predetermined time is 10 seconds.

[0119] According to this structure, when the heating cooker 10 is in the heating state for heating cooking, even if the temperature drops in the middle of the temperature rise after entering the heating state due to some reasons, the temperature will rise again. Therefore, during the set predetermined time, if the temperature rise gradient α of the temperature detected by the temperature sensor 25 is not continuously lower than the set second threshold value α2, the air blower 22 can be automatically started to drive, which can prevent the air blower 22 from being unable to start driving due to a temporary temperature drop. As a result, it is possible to determine that the heating state is in progress earlier.

[0120] When the cooking device 10 is not in the heating state, during the set specified time, the temperature rise gradient α of the detected temperature of the temperature sensor 25 is continuously lower than the set second threshold value α2, so the blower 22 will not start to be driven automatically, thereby preventing the blower 22 from being automatically driven due to false detection when the cooking device 10 is not in the heating state.

[0121] A fifth embodiment of the prescribed conditions will be described.

[0122] This embodiment is similar to the fourth embodiment. When the cooking device 10 is in the heating state for cooking, even if the temperature drops in the middle of the temperature rise after entering the heating state for some reason, the blower 22 starts to be driven automatically, thereby preventing the blower 22 from being unable to start driving automatically due to a temporary temperature drop, and preventing the blower 22 from automatically starting to drive due to false detection when the cooking device 10 is not in the heating state.

[0123] The predetermined conditions are that the temperature rise gradient α of the temperature detected by the temperature sensor 25 does not continuously fall below the set second threshold α2 and that the temperature rise gradient α of the temperature detected by the temperature sensor 25 becomes equal to or greater than the set second threshold α2 a predetermined number of times or more.

[0124] According to this structure, when the heating cooker 10 is in the heating state for heating cooking, even if the temperature drops in the middle of the temperature rise after entering the heating state due to some reasons, if the temperature rise gradient α of the temperature detected by the temperature sensor 25 is not continuously lower than the set second threshold value α2 during the set prescribed time, the blower 22 can be automatically started to drive, which can prevent the blower 22 from being unable to automatically start driving due to a temporary temperature drop. Therefore, it can be determined that the heating state is early.

[0125] When the cooking device 10 is not in the heating state, the blower 22 will not start driving automatically until the temperature rise gradient α of the detected temperature of the temperature sensor 25 becomes above the set second threshold value α2 for a specified number of times or more, and the temperature rise gradient α is continuously lower than the second threshold value α2. Therefore, the blower 22 will not start driving automatically, thereby preventing the blower 22 from starting to drive automatically due to false detection when the cooking device 10 is not in the heating state.

[0126] For example, when the heated food is moved to the heating cooker 10 when the heating cooker 10 is not in the heating state and is not heating, even if the heating cooker 10 is not heating, when the food is stirred or the cover of the food is removed, the temperature of the heating cooker 10 may rise. In such a case, the temperature rises at the time of stirring or removing the cover, but the temperature does not rise thereafter. Therefore, until the temperature rise gradient α of the temperature detected by the temperature sensor 25 becomes equal to or greater than the set second threshold value α2 for a predetermined number of times or more, the temperature continues to be lower than the second threshold value α2, and therefore the blower 22 does not automatically start driving, so it is possible to prevent the blower 22 from automatically starting driving due to erroneous detection when the heating cooker 10 is not in the heating state.

[0127] Therefore, when the cooking device 10 is in the heating state for cooking, even if the temperature drops in the middle of the temperature rise after entering the heating state for some reason, the blower 22 can be automatically started to be driven, which can prevent the blower 22 from being unable to automatically start to be driven due to a temporary temperature drop, and prevent the blower 22 from automatically starting to be driven due to false detection when the cooking device 10 is not in the heating state.

[0128] Next, a first embodiment will be described in which the operation of automatically starting to drive the blower 22 when the cooking device 10 is in a heating state without placing a cooking device such as a pot on the cooking device 10 will be described.

[0129] When the heating cooker 10 is in a heating state without placing a cooking device such as a pot, it may be difficult for the temperature sensor 25 to stably detect the temperature. For example, when the heating cooker 10 is a gas stove, the temperature sensor 25 directly detects the temperature of the flame. In other words, it detects the temperature of the open flame.

[0130] The temperature detected by the temperature sensor 25 directly detecting the flame is as follows: Figure 5 That is, the temperature rises to a temperature higher than the third predetermined temperature T3 by exceeding the first predetermined temperature T1 by entering the heating state, and then a rapid temperature rise and temperature drop are repeated due to the swing of the flame, and the temperature gradually rises.

[0131] Therefore, the temperature rise gradient α of the temperature detected by the temperature sensor 25 immediately after entering the heating state is equal to or greater than the first threshold α1, and the detected temperature becomes equal to or greater than the first predetermined temperature T1.

[0132] However, since it is difficult to stably detect the temperature of a flame that repeatedly produces rapid temperature rises and temperature drops, it is difficult to determine the previously described specified conditions, and it is impossible to obtain a result that the temperature rise gradient α of the detected temperature of the temperature sensor 25 satisfies the previously described specified conditions, resulting in a situation where the blower 22 cannot be automatically started to be driven.

[0133] When the cooking device 10 is in a heating state without placing a cooking appliance such as a pot, no fumes or the like due to heating and cooking are generated. However, since it is in a heating state, carbon dioxide and carbon monoxide are generated. If ventilation is not performed, there is a concern of carbon monoxide poisoning. Therefore, it is desirable to drive the blower 22 for ventilation.

[0134] Therefore, when a predetermined number of rapid temperature increases are detected in the determination of predetermined conditions, the blower 22 is automatically started to be driven regardless of the predetermined conditions, thereby preventing carbon monoxide poisoning or the like.

[0135] Specifically, the third threshold value α3 is set to a value higher than the temperature rise gradient α during normal heating cooking. In the judgment of the specified conditions, when the temperature rise gradient α of the detected temperature of the temperature sensor 25 exceeds the third threshold value α3 a specified number of times, the blower 22 is automatically started to be driven.

[0136] According to this configuration, even when the temperature detected by the temperature sensor 25 repeatedly experiences abrupt temperature rises and temperature drops, and stable temperature detection cannot be performed and predetermined conditions are not satisfied, the blower 22 can be automatically started to be driven.

[0137] Next, a second embodiment will be described in which the operation of automatically starting to drive the blower 22 when the cooking device 10 is in a heating state without placing a cooking device such as a pot on the cooking device 10 will be described.

[0138] As described above, when the cooked food is moved to the cooking device 10 without being placed in a heating state, when the cooked food is stirred or the lid of the cooked food is removed, the temperature of the cooking device 10 may rise or fall sharply even when the food is not being heated.

[0139] Therefore, according to the configuration of the first embodiment, when the cooked food is stirred or the lid is removed from the cooked food multiple times, the air blower 22 may automatically start driving due to erroneous detection.

[0140] In order to eliminate this situation, various studies have been conducted. When the heating cooker 10 is in a heating state without placing a cooking device such as a pot, the temperature of the flame is as follows: Figure 5 As shown, the temperature of the flame is higher than the third set temperature T3, and rapid temperature rise and temperature drop are repeated, and the temperature becomes higher in sequence. When the temperature rises rapidly, the temperature before the temperature rise becomes higher in sequence each time the temperature rises rapidly.

[0141] That is, Figure 5 As shown, the temperature Tn before the rapid temperature rise is higher than the temperature Tn−1 before the previous rapid temperature rise.

[0142] With regard to this situation, the structure is such that when the temperature rise gradient α of the temperature detected by the temperature sensor 25 exceeds the third threshold value α3, the temperature Tn–1 before the temperature rise is stored, and then when the temperature rise gradient α of the temperature detected by the temperature sensor 25 exceeds the third threshold value α3, the temperature Tn before the temperature rise is stored, and this operation is repeated. When the temperature Tn before the temperature rise stored this time exceeds the temperature Tn–1 before the temperature rise stored last time, or when the state in which the temperature detected by the temperature sensor 25 is higher than the third prescribed temperature T3 continues, when the temperature Tn before the temperature rise stored this time exceeds the temperature Tn–1 before the temperature rise stored last time for a prescribed number of times, the air blower 22 starts to be driven automatically.

[0143] That is, the configuration is not to detect the number of times the temperature rises suddenly, but to detect that the temperature rises gradually before the temperature rises when the temperature rises suddenly.

[0144] With this structure, even if the temperature of the cooking device 10 detected by the temperature sensor 25 repeatedly experiences a sharp rise and fall, and the temperature cannot be stably detected and the prescribed conditions are not satisfied, the blower 22 can be automatically started to be driven.

[0145] Furthermore, when the cooked food is moved to the cooking device 10 without being put into the heating state, and when the temperature of the cooking device 10 rises or drops sharply by stirring the food or removing the lid of the food, the detected temperature of the temperature sensor 25 drops successively, and therefore the temperature before the temperature rises sharply this time is lower than the temperature before the temperature rise sharply last time, so the air blower 22 will not start driving automatically, thereby preventing the air blower 22 from starting driving automatically due to erroneous detection when the cooking device 10 is not in the heating state.

[0146] In addition, the third set temperature T3 is preferably set to a temperature lower than the temperature obtained by directly detecting the temperature of the heating unit 11 in a weaker heating state by the temperature sensor 25. In addition, by setting the value as high as possible within this range, the accuracy of distinguishing the rapid temperature rise caused by heating cooking and the rapid temperature rise caused by directly detecting the heating unit 11 in a heating state can be improved.

[0147] In addition, depending on the timing of the measurement, there is a case where the temperature before the sudden temperature rise does not become the lowest temperature when there is a sudden temperature rise. For example, the temperature measured shortly before the actual sudden temperature rise or in the middle of the temperature rise becomes the temperature before the sudden temperature rise in the measurement. In such a case, even if the flame is measured directly, there is a case where the measured temperature Tn before the temperature rise stored this time is lower than the temperature Tn-1 before the temperature rise stored last time. However, in the case of detecting the flame, since it is higher than the third set temperature T3, the counter will not be reset, and the blower 22 can be automatically started to be driven during the repeated measurement process.

[0148] based on Figure 6 The flowchart shown in the figure explains the specific operation when the predetermined conditions are those of the first embodiment.

[0149] That is, first, starting from the state of the standby mode in which the air blower 22 is stopped, it is determined whether the temperature rise gradient α of the temperature detected by the temperature sensor 25 is above the first threshold value α1 (S100). When it is determined to be above the first threshold value α1 (S100, yes), it is determined whether the temperature detected by the temperature sensor 25 is above the first prescribed temperature T1 (S101). If it is above the first prescribed temperature T1 (S101, yes), a counter provided in the control unit 24 and counting the time t1 for measuring the prescribed time (here 60 seconds) for determining whether the prescribed condition is met is set to t1=0 to start counting (S102).

[0150] Determine whether t1 is less than 60 seconds (S103). If so, determine whether the temperature rise gradient α is above the second threshold value α2 as a specified time period (S104). If so, determine whether the temperature rise gradient α is above the second threshold value α2 (S104, yes). Determine whether t1 is less than 60 seconds (S103). If so, determine whether the temperature rise gradient α is above the second threshold value α2 (S104, yes). Automatically start driving the blower 22 (S105).

[0151] If t1 is more than 60 seconds (S103, No), the counter counting t1 stops counting t1 as the prescribed time has passed, and the count of t1 is reset (S106), returning to the beginning. In addition, it is determined whether the temperature rise gradient α is greater than the first threshold α1 (S100). If it is determined that it is not greater than the first threshold α1 (S100, No), it is determined whether the detected temperature of the temperature sensor 25 is greater than the first prescribed temperature T1 (S101). If it is determined that it is not greater than the first prescribed temperature T1 (S101, No), it also returns to the beginning.

[0152] Therefore, after it is determined that the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the first threshold value α1 and the detected temperature of the temperature sensor 25 is above the first specified temperature T1, if the temperature rise gradient α of the detected temperature of the temperature sensor 25 becomes above the set second threshold value α2 during the specified time, the blower 22 starts to be driven automatically; if the temperature rise gradient α does not become above the second threshold value α2 during the specified time, the blower 22 does not start to be driven automatically.

[0153] based on Figure 7 The flowchart shown in the figure explains the specific operation when the predetermined condition is the second embodiment and the operation of automatically starting to drive the blower 22 when the cooking device 10 is in the heating state without placing a cooking appliance such as a pot is the second embodiment.

[0154] That is, first, starting from the state of the standby mode in which the blower 22 is stopped, N=0 (S200). N is the number of times the temperature rise gradient α of the temperature detected by the temperature sensor 25 exceeds the third threshold α3 and the temperature Tn before the sudden temperature rise is higher than the temperature Tn-1 before the previous sudden temperature rise.

[0155] First, with Figure 6Similarly, S100 to S103 of the flowchart described in , it is determined whether the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the first threshold value α1 (S201). If it is above the first threshold value α1 (S201, yes), it is determined whether the detected temperature of the temperature sensor 25 is above the first prescribed temperature T1 (S202). If it is above the first prescribed temperature T1 (S202, yes), the counter for counting the time t1 is set to t1=0 to start counting (S203).

[0156] Then, a counter for counting the time t2 for counting a predetermined time is set to t2 = 0, and counting is started (S204).

[0157] It is determined whether t1 is less than 60 seconds (S205). If so, it is determined whether the temperature rise gradient α is less than or equal to a third threshold α3 as a predetermined time period (S206).

[0158] If t1 is more than 60 seconds (S205, No), the counter counting t1 and t2 of the counter counting t1 stops counting as the prescribed time has passed, and the counts of t1 and t2 are reset (S207), returning to the beginning. In addition, it is determined whether the temperature rise gradient α is greater than the first threshold α1 (S201). If it is determined that it is not greater than the first threshold α1 (S201, No), it is determined whether the detected temperature of the temperature sensor 25 is greater than the first prescribed temperature T1 (S202). If it is determined that it is not greater than the first prescribed temperature T1 (S202, No), it also returns to the beginning.

[0159] If the temperature rise gradient α of the temperature detected by the temperature sensor 25 is below the third threshold value α3 (S206, yes), it is judged that there is no sharp temperature rise, and it is judged whether the temperature rise gradient α of the temperature detected by the temperature sensor 25 is above the second threshold value α2 (S208). If the temperature rise gradient α is above the second threshold value α2 (S208, yes), it is judged whether the time (counted t2) during which the temperature rise gradient α is above the second threshold value α2 is above the specified time (S209). If it is above the specified time (S209, yes), the temperature rise gradient α is above the second threshold value α2 during the specified time, and the air blower 22 is automatically started to be driven (S210).

[0160] If the predetermined time is less than (S209, No), the process returns to S205 and does not automatically start driving the blower 22. If the temperature rise gradient α is not greater than the second threshold α2 (S208, No), the counter for counting t2 is reset again and starts counting from t2=0 (S204).

[0161] If the temperature rise gradient α of the temperature detected by the temperature sensor 25 exceeds the third threshold α3 (S206, No), it is determined that there is a rapid temperature rise, and the temperature Tn before the rapid temperature rise is stored. Then, it is determined whether the stored temperature Tn before the rapid temperature rise exceeds the temperature Tn-1 before the previous rapid temperature rise (S211).

[0162] When it is determined that Tn exceeds Tn-1 (S211, yes), the counter for counting N is counted by 1 (S212), and the number of times the temperature rise gradient α of the temperature detected by the temperature sensor 25 exceeds the third threshold value α3 is counted. It is determined whether the number of counted N is a prescribed number of times (4 in this case) or more (S213). If it exceeds the prescribed number of times (S213, yes), the air blower 22 is automatically started to be driven (S210). If it is less than the prescribed number of times (S213, no), the temperature detected by the temperature sensor 25 is compared with the first prescribed temperature T1 (S202).

[0163] When Tn is below Tn-1 (S211, No), determine whether Tn is below the third prescribed temperature T3 (S214); when Tn is below the third prescribed temperature T3 (S214, Yes), reset the counter counting N and set N=0 (S215), and reset the counter counting t2 again and start counting from t2=0 (S204); when Tn exceeds the third prescribed temperature T3 (S214, No), determine whether t1 is longer than the prescribed time (S205).

[0164] By this operation, when the temperature (Tn) stored this time exceeds the temperature (Tn-1) stored last time, or Tn exceeds the third predetermined temperature T3, the number of times Tn exceeds Tn-1 is counted. That is, when the temperature rises, or the state where the flame is detected continues because Tn is the detected temperature of the temperature sensor 25 and the detected temperature (Tn) of the temperature sensor 25 is higher than the third predetermined temperature T3, the blower 22 is automatically started to be driven when the temperature (Tn) stored this time exceeds the temperature (Tn-1) stored last time for a predetermined number of times.

[0165] Furthermore, the judgment (S206) of whether the temperature rise gradient α of the detected temperature of the temperature sensor 25 is below the third threshold value α3 is performed before the judgment (S208) of whether the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the second threshold value α2, so the above actions are performed in the judgment of the specified conditions.

[0166] In addition, Figure 7In the flowchart of , S211 and S214 may not be provided and the NO of S206 may be directly connected to S212. This is the first embodiment for preventing the automatic driving of the blower from being started due to erroneous detection when the cooking device 10 is not in the heating state.

[0167] That is, the fan 22 is configured to automatically start operating when the temperature increase gradient α of the temperature detected by the temperature sensor 25 exceeds the third threshold value α3 a predetermined number of times in the determination of the predetermined condition.

[0168] based on Figure 8 The flowchart shown explains the specific operation when the prescribed conditions are the third embodiment and the operation of automatically starting to drive the blower 22 when the cooking device 10 is in a heating state without placing a cooking device such as a pot on the cooking device 10 is the second embodiment.

[0169] That is, first, in Figure 8 In the flowchart shown in FIG. Figure 6 S100 to S103 and S106 of the flowchart described in , after determining that the detected temperature α of the temperature sensor 25 is equal to or higher than the first threshold α1 and the detected temperature of the temperature sensor 25 is equal to or higher than the first predetermined temperature T1, it is determined whether a predetermined time has passed.

[0170] exist Figure 8 In the flowchart shown in FIG. Figure 7 S206, S211 to S215 of the flowchart described in the description are the same. After it is determined that the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the first threshold value α1, and the detected temperature of the temperature sensor 25 is above the first specified temperature T1, the number of times the temperature rise gradient α of the detected temperature of the temperature sensor 25 exceeds the third threshold value α3 in the judgment of the specified conditions, and the temperature Tn before the sudden temperature rise is higher than the temperature Tn-1 before the last sudden temperature rise is counted, and the air blower 22 is automatically started to be driven.

[0171] Here, starting from the state of the standby mode in which the blower 22 is stopped, K=0 and N=0 are initially set (S300). K is the number of times the temperature rise gradient α of the temperature detected by the temperature sensor 25 is equal to or greater than the second threshold α2.

[0172] Then, it is determined whether the temperature rise gradient α of the detected temperature of the temperature sensor 25 is below the set third threshold value α3 (S306). If it is determined that the temperature rise gradient α of the detected temperature of the temperature sensor 25 is below the third threshold value α3 (S306, yes), the temperature rise gradient α of the detected temperature of the temperature sensor 25 is compared with the second threshold value α2 (S312). If it is determined that the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the second threshold value α2 (S312, yes), the counter for counting K is counted by 1 (S313), and it is determined whether K is above the specified number of times (here 10) (S314).

[0173] If the temperature rise gradient α of the detected temperature of the temperature sensor 25 exceeds the third threshold value α3, the temperature rise gradient α is above the second threshold value α2. Therefore, when it is judged that the temperature rise gradient α exceeds the third threshold value α3 (S306, no), the counter that counts K is counted and set to K+1 (S315).

[0174] This makes it possible to accurately count the number of times that the temperature rise gradient α of the temperature detected by the temperature sensor 25 is equal to or greater than the second threshold α2 .

[0175] If the temperature rise gradient α of the temperature detected by the temperature sensor 25 is lower than the second threshold α2 ( S312 , No), the counter counting K is reset to K=0 ( S316 ), and it is determined whether t1 is longer than a predetermined time ( S304 ).

[0176] Thus, when the temperature rise gradient α of the temperature detected by the temperature sensor 25 exceeds the second threshold value α2 for more than a predetermined number of times (here, 10 times) (S314, yes), the air blower 22 is automatically started to be driven (S317). When the temperature rise gradient α of the temperature detected by the temperature sensor 25 does not exceed the second threshold value α2 for more than a predetermined number of times (S314, no), it is determined again whether t1 is longer than a predetermined time (S304).

[0177] based on Fig. 9 The flowchart shown explains the specific actions of the fourth and fifth embodiments when the specified conditions are the second embodiment and the action of automatically starting to drive the blower 22 when the cooking device 10 is in a heating state without placing a cooking device such as a pot on the cooking device 10 is the second embodiment.

[0178] That is, first, in Fig. 9 In the flowchart shown in FIG. 1 , S401 to S406 are the same as those already in Figure 7S201 to S205 and S207 of the flowchart described in are the same, and after determining that the detected temperature α of the temperature sensor 25 is equal to or higher than the first threshold α1 and the detected temperature of the temperature sensor 25 is equal to or higher than the first predetermined temperature T1, it is determined whether a predetermined time has passed.

[0179] exist Fig. 9 In the flowchart shown in FIG. 1 , S407 to S413 are the same as those already in Figure 8 S306, S315, S307 to S311 described in the flowchart shown are the same. After the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the first threshold value α1, and the detected temperature of the temperature sensor 25 is above the first specified temperature T1, the number of times the temperature rise gradient α of the detected temperature of the temperature sensor 25 exceeds the third threshold value α3 in the judgment of the specified conditions, and the temperature Tn before the sudden temperature rise is higher than the temperature Tn-1 before the last sudden temperature rise is counted, and the air blower 22 is automatically started to be driven.

[0180] Here, starting from the state of the standby mode in which the blower 22 is stopped, K=0 and N=0 are initially set ( S400 ).

[0181] Then, if it is determined that the detected temperature of the temperature sensor 25 is above the first specified temperature T1 (S402, yes), the counter provided in the control unit 24 and counting the time t1 starts counting from t1=0 (S403), and the counter for measuring the specified time and counting the time t2 starts counting from t2=0 (S404), and it is determined whether t1 is less than the specified time (S405). If it is less than the specified time (S405, yes), it is determined whether the temperature rise gradient α of the detected temperature of the temperature sensor 25 is the set first value. If the temperature rise gradient α of the detected temperature of the temperature sensor 25 is below the third threshold α3 (S407, yes), then determine whether the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the second threshold α2 (S414); if the temperature rise gradient α of the detected temperature of the temperature sensor 25 is above the second threshold α2 (S414, yes), then count the counter for counting K to 1 (S415), and determine whether the counted t2 is above the specified time (here 10 seconds) (S416).

[0182] If t2 is longer than the prescribed time (S416, yes), the temperature rise gradient α has not been continuously lower than the second threshold value α2 during the prescribed time, so the blower 22 is automatically started to be driven (S417). Accordingly, it is a prescribed condition that the temperature rise gradient α of the detected temperature of the temperature sensor 25 is not continuously lower than the second threshold value α2 during the prescribed time (here t1 = 10 seconds).

[0183] If t2 is less than the specified time (S416, no), determine whether K is more than the specified number of times (here 10 times) (S418). If it is more than the specified number of times (S418, yes), automatically start driving the air blower 22. If it is less than the specified number of times (S418, no), determine again whether t1 is more than the specified time (S405).

[0184] According to this, it is a predetermined condition that the temperature rise gradient α of the detected temperature of the temperature sensor 25 does not continuously fall below the second threshold value α2 and remains equal to or higher than the second threshold value α2 a predetermined number of times or more.

[0185] When the temperature rise gradient α of the temperature detected by the temperature sensor 25 is lower than the second threshold α2 (S414, No), it is determined whether the temperature rise gradient α of the temperature detected by the temperature sensor 25 was lower than the second threshold α2 last time (S419). If it is lower than the second threshold α2 (S419, Yes), the counter for counting K is reset to K=0 (S420), and the counter for counting t2 is reset to start counting from t2=0 (S404), and it is determined again whether t1 is longer than the specified time (S405). Thus, when the temperature rise gradient α of the temperature detected by the temperature sensor 25 is lower than the second threshold α2, the air blower 22 does not automatically start driving if the temperature rise gradient α was lower than the second threshold α2 last time.

[0186] When the temperature rise gradient α of the temperature detected by the temperature sensor 25 is lower than the second threshold value α2 (S414, No), if the temperature rise gradient α of the temperature detected by the temperature sensor 25 was above the second threshold value α2 last time (S419, No), it is determined whether t2 is above the specified time (S416); if t2 is above the specified time (S416, Yes), the air blower 22 is automatically started to be driven (S417).

[0187] Like this, when the temperature rise gradient α of the detected temperature of the temperature sensor 25 is continuously lower than the second threshold value α2 (S419, yes), the counter becomes K=0, t2=0, t2 does not become the specified time, and the blower 22 does not start driving automatically. If it is not continuously lower than the second threshold value α2 during the specified time, the blower 22 starts driving automatically. Therefore, it becomes a specified condition that the temperature rise gradient α of the detected temperature of the temperature sensor 25 is not continuously lower than the second threshold value α2 during the specified time.

[0188] If t2 is less than the specified time (S416, No), it is determined whether K is more than the specified number of times (here 10 times) (S418). If it is more than the specified number of times (S418, Yes), the blower 22 is automatically started to be driven (S417). If K is less than the specified number of times (S418, No), it is determined again whether t1 is more than the specified time (S405).

[0189] According to this, the predetermined condition is that the temperature rise gradient α of the temperature detected by the temperature sensor 25 does not continuously fall below the second threshold α2 and the temperature rise gradient α of the temperature detected by the temperature sensor 25 reaches or exceeds the second threshold α2 a predetermined number of times or more.

[0190] Next, a configuration for stopping the drive of the air blower 22 driven in the automatic operation mode will be described.

[0191] The control unit 24 uses a counter to count the time after the blower 22 is driven, and stops driving the blower 22 when the detected temperature of the temperature sensor 25 is lower than the set second specified temperature T2 after the counted time has passed the set set time.

[0192] The set time is a time longer than the time from the predetermined temperature T1 to the second predetermined temperature T2 at the first threshold value α1, and is 5 minutes in the embodiment.

[0193] When the counted time is shorter than the set time, even if the temperature detected by the temperature sensor 25 is lower than the second predetermined temperature T2, the driving of the blower 22 is not stopped but is continued.

[0194] That is, after the blower 22 has been automatically operated for a set time or longer (i.e., automatically started to drive and continued to drive), the drive of the blower 22 is automatically stopped when the detected temperature of the temperature sensor 25 is lower than the second specified temperature T2; when the automatic operation time of the blower 22 is shorter than the set time, the blower 22 is continued to be driven even if the detected temperature of the temperature sensor 25 is lower than the second specified temperature T2.

[0195] With this configuration, the blower 22 can be automatically operated continuously during the period from when the cooking device 10 is in the heating state to when it is in the heating stop state.

[0196] Furthermore, even when the temperature is low (lower than the second predetermined temperature T2) immediately after the start of driving of the blower 22, it is possible to prevent the driving of the blower 22 from being stopped due to erroneous detection.

[0197] For example, shortly after the blower 22 is automatically started to drive, there is a situation where the temperature above the heating cooker 20 is low and the detection temperature of the temperature sensor 25 is lower than the second specified temperature T2. If the drive of the blower 22 is simply set to automatically stop when the detection temperature of the temperature sensor 25 is lower than the second specified temperature T2, it will stop shortly after the drive is automatically started, and the blower 22 cannot continue to automatically operate during the period from when the heating cooker 10 is in the heating state to when it becomes the heating stop state.

[0198] In addition, after the set time, the detection temperature of the temperature sensor 25 becomes higher due to the use of the heating cooker 10. Therefore, after the set time, the detection temperature of the temperature sensor 25 is lower than the second specified temperature T2 after the heating of the heating cooker 10 is stopped, thereby automatically stopping the drive of the blower 22 at the exact time.

[0199] Specifically, based on Fig.10 The flowchart shown in the figure explains the operation of stopping the driving of the blower 22 above.

[0200] That is, it is determined whether the blower 22 has been driven for a set time after the blower 22 automatically starts to drive (S500). When it is determined that it has been driven for the set time (S500, yes), it is determined whether the detected temperature of the temperature sensor 25 is lower than the second prescribed temperature T2 (S501). When it is determined that it is lower than the second prescribed temperature T2 (S501, yes), the driving of the blower 22 is stopped (S502).

[0201] When operating in the automatic operation mode, the air volume of the blower may be automatically adjusted based on the detected temperature, for example, the temperature detected by the temperature sensor 25 .

[0202] In addition, the automatic operation mode can be switched to the manual operation mode by manual operation.

[0203] In addition, the restoration from the manual operation mode to the automatic operation mode occurs at the following timing, for example.

[0204] When a certain period of time has passed since the manual operation mode was switched.

[0205] When the fan drive is stopped.

[0206] When a certain period of time has passed since the driving of the blower was stopped.

Claims

1. A range hood comprising a blower, a temperature sensor for detecting the temperature above a heating cooker, and a control unit for automatically controlling the operation of the range hood, The range hood is characterized in that: The control unit calculates a temperature gradient of the detected temperature based on the detected temperature, The control unit has an automatic operation mode, which drives the blower when the temperature gradient of the detection temperature of the temperature sensor satisfies the prescribed conditions after the temperature gradient is above a first threshold value indicating a temperature rise state and the detection temperature of the temperature sensor is above a first prescribed temperature.

2. The range hood according to claim 1, characterized in that: The predetermined condition is that the temperature gradient of the temperature detected by the temperature sensor becomes equal to or greater than a second threshold value indicating a temperature rising state.

3. The range hood according to claim 1, characterized in that: The predetermined condition is that, during a set predetermined time period, the temperature gradient of the temperature detected by the temperature sensor becomes equal to or greater than a second threshold value indicating a temperature rising state.

4. The range hood according to claim 1, characterized in that: The predetermined condition is that the temperature gradient of the temperature detected by the temperature sensor becomes equal to or higher than a second threshold value indicating a temperature rising state for a predetermined number of times or more.

5. The range hood according to claim 1, characterized in that: The predetermined condition is that the temperature gradient of the temperature detected by the temperature sensor does not continuously fall below a second threshold value indicating a temperature rising state during a set predetermined time period.

6. The range hood according to claim 1, characterized in that: The predetermined condition is that the temperature gradient of the temperature detected by the temperature sensor does not continuously fall below a second threshold indicating a temperature rise state, and the temperature gradient of the temperature detected by the temperature sensor becomes equal to or greater than the second threshold a predetermined number of times or more.

7. The range hood according to any one of claims 1 to 6, characterized in that: The automatic operation mode drives the blower when the temperature gradient of the temperature detected by the temperature sensor exceeds a third threshold indicating a temperature rise state a predetermined number of times in the determination of the predetermined condition. The third threshold value is a threshold value that causes a temperature rise higher than the second threshold value indicating a temperature rise state used under a predetermined condition.

8. The range hood according to claim 7, characterized in that: The automatic operation mode has a third predetermined temperature higher than the first predetermined temperature, and in the determination of the predetermined condition, when the temperature rise gradient of the temperature detected by the temperature sensor exceeds the set third threshold value, the temperature before the temperature rise is stored, When the temperature stored this time exceeds the temperature stored last time, or when the temperature detected by the temperature sensor continues to be higher than the third specified temperature, the blower is driven when the temperature stored this time exceeds the temperature stored last time for a specified number of times.

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