JP2009121751A - Oven hood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically operate an oven hood operatively connected with a heating cooker, and to automatically control exhaust capability according to the working condition of the heating cooker. <P>SOLUTION: This oven hood 1 is mounted on the upside of an IH cooker 3, and an exhaust fan motor 5 is constructed in the interior of the oven hood 1. The exhaust fan motor 5 sucks lamp black generated in user's cooking using the IH cooker 3, and discharges the same from a discharge opening 7 to the outdoors. A thermoelectromotive force type temperature sensor 10 is fitted to the oven hood 1, and configured to detect far infrared rays generated by an object through a Fresnel lens 12, and the sensor can detect far infrared rays on a top plate 2 in a wide range. When the user starts the operation of the heating cooker, the thermoelectromotive force type temperature sensor 10 detects a heat source on the heating cooker, and a control part 16 controls the exhaust fan motor 5 based on the detection. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a range hood that detects a heat source of a cooking appliance and operates an exhaust fan motor in an interlocked manner.

  Conventionally, this type of range hood uses a pyroelectric heat detection element that can obtain an electrical signal by heat change, and detects a temperature generated when using a cooking device (ventilator fan that starts ventilation operation ( Patent Document 1) has been proposed.

The ventilating fan shown in Patent Document 1 detects the person approaching the cooking device with the pyroelectric heat detection element, thereby rotating the pyroelectric heat detection element with a motor, and the two-dimensional of the top plate of the cooking device. When a thermal image is obtained and a high temperature portion is detected in the thermal image, it is determined whether or not the cooking device is being used and the ventilation fan is operated.
Japanese Patent Laid-Open No. 05-010561

  In such a system, since the area in which the pyroelectric heat detection element can detect the temperature is narrow, in order to monitor the heat source of the entire cooking device, a plurality of pyroelectric heat detection elements and an operation unit that rotates the pyroelectric heat detection element An arithmetic processing device for creating a two-dimensional thermal image is necessary and has a complicated configuration. In addition, there is a time loss of rotation and computation to create a two-dimensional thermal image, the occurrence of a high temperature part cannot be detected quickly, the interlocking operation of the ventilation fan is delayed, and the operating part that rotates the pyroelectric heat detection element is There is a risk of sticking with oily smoke.

  The present invention solves such a problem, and does not require complicated arithmetic processing, instantaneously detects the occurrence of a high temperature part, interlocks with a ventilation fan, and operates an operating part that rotates a pyroelectric heat detection element. Aim to provide no range hood.

  In order to achieve the above object, the range hood of the present invention is installed around a cooking device, detects an exhaust fan motor that exhausts oily smoke and odor generated during cooking to the outside, and detects far infrared rays around the cooking device. A thermoelectromotive temperature sensor incorporating a monocular element that performs and a control unit that converts the result detected by the thermoelectromotive temperature sensor into temperature, and the cooking device based on the temperature converted by the control unit The range hood is characterized in that the exhaust fan motor is driven or stopped by determining the use state of the exhaust hood.

  By means of monitoring the use status of the cooking device with a monocular element, a range hood is obtained that does not require complicated arithmetic processing and does not require an operating part for rotating the element.

  The other means of the range hood of the present invention is characterized in that the previous detected temperature is compared with the next detected temperature detected after a certain time, and the exhaust fan motor is controlled when a certain temperature difference occurs. The range hood described in 1 is used.

  By this means, a temperature change on the cooking device can be detected relatively, and the range hood can be controlled without being influenced by the ambient temperature.

  The other means of the range hood of the present invention is the range hood according to claim 2, characterized in that the exhaust fan motor is started when the next detected temperature detected after a predetermined time is higher than the previously detected temperature. It is.

  By this means, the range hood can detect the start of heating of the cooking device and can automatically operate the exhaust fan motor to exhaust the oil smoke outside the room.

  The other means of the range hood of the present invention is the range hood according to claim 2 or 3, characterized in that the exhaust fan motor is stopped when the next detected temperature detected after a predetermined time from the previous detected temperature is low. It is a thing.

  By this means, the range hood can detect the heating stop of the cooking device and can automatically stop the operation of the exhaust fan motor.

  4. The range hood according to claim 2, wherein the other means of the range hood of the present invention maintains the operation of the exhaust fan motor when the next detected temperature detected after a predetermined time from the previously detected temperature is low. It is.

  This means that the exhaust fan motor will stop when the heat is temporarily cooled, such as when the cooking pan is covered with a cooking device or when the next cooking is started after cooking has been completed. A range hood can be obtained that prevents it from stopping at the end.

  The other means of the range hood of the present invention is characterized in that the current state of the exhaust fan motor is maintained when there is no constant difference between the previously detected temperature and the next detected temperature detected after a certain time. The range hood described in 2, 3, 4 or 5 is used.

  By this means, it is possible to obtain a range hood that prevents the exhaust fan motor from being stopped when the pan being cooked by the cooking device is boiling or when the temperature is stable in tempura dishes or the like.

  In addition, the other means of the range hood of the present invention determines that the heating of the cooking device has been completed when the amount of change in the next detection temperature detected after a predetermined time and the previous detection temperature exceeds a certain reference, and the exhaust fan motor The range hood according to claim 2, 3, 4, 5, or 6 that performs control of the above.

  After cooking is completed by this means, the thermoelectric temperature sensor detects the top plate on the upper surface of the heater section heated to 350 ° C. to 400 ° C. in the case of an IH cooking device, and the detected temperature changes greatly. At this time, a range hood is obtained that determines that heating of the cooking device has been completed.

  The other means of the range hood of the present invention is characterized in that the temperature converted by the control unit is corrected according to the relative distance between the thermoelectromotive force type temperature sensor and the cooking device. The range hood described in 3, 4, 5, 6 or 7 is used.

  By this means, a range hood capable of performing stable temperature detection even when the distance between the thermoelectromotive force type temperature sensor and the cooking device changes is obtained.

  The other means of the range hood of the present invention is characterized in that the thermoelectric temperature sensor is provided with a protective cover that transmits far-infrared rays to prevent the thermoelectric temperature sensor from being exposed to oily smoke. The range hood according to Item 2, 3, 4, 5, 6, 7 or 8.

  By this means, it is possible to obtain a range hood that prevents oil smoke and dust blown up by the exhaust fan motor from adhering to the thermoelectromotive force type temperature sensor and preventing proper temperature detection.

  The other means of the range hood of the present invention is characterized in that a lens for transmitting far-infrared rays is provided on the thermoelectric temperature sensor, 2. 3, 4, 5, 6, 7, 8 or 9 The described range hood is used.

  By this means, a range hood capable of expanding the monitoring area of the thermoelectromotive force type temperature sensor and capable of protecting the thermoelectromotive force type temperature sensor is obtained.

  The other means of the range hood of the present invention includes a smoke sensor, and controls the exhaust fan motor when smoke is detected. , 9 or 10 described above.

  By this means, a range hood for operating the exhaust fan motor by detecting smoke and gas generated during cooking when the grill is used can be obtained.

  The other means of the range hood of the present invention includes a humidity sensor, and controls the exhaust fan motor when the humidity is detected. , 9, 10 or 11.

  By this means, it is possible to obtain a range hood for controlling the fan motor by judging the cooking state from moisture such as steam generated during cooking and the temperature change detected by the thermoelectromotive force type temperature sensor.

  The other means of the range hood according to the present invention is characterized in that the exhaust fan motor is a DC motor, wherein the exhaust fan motor is a DC motor according to claim 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12. This is a range hood.

  By this means, it is possible to obtain a range hood that finely adjusts and controls the exhaust amount due to the operation of the exhaust fan motor based on the estimation result of the cooking situation in the cooking device.

  According to the present invention, it is possible to provide a range hood that does not require complicated arithmetic processing and instantaneously detects the occurrence of a high-temperature part, quickly interlocks with a ventilation fan, and does not have an operating part that rotates a pyroelectric heat detection element. Also, it is possible to provide a range hood capable of quickly exhausting heat generated during cooking, exhausting heat from cooking and exhausting oily smoke and odor generated during cooking, and cooking exhaust.

  In addition, a thermoelectric temperature that is installed near the cooking device and has a built-in exhaust fan motor that exhausts oily smoke and odor generated during cooking to the outside of the room and a monocular element that detects far-infrared rays around the cooking device. A sensor and a control unit that converts a result detected by the thermoelectromotive force type temperature sensor into a temperature, and judges the use state of the cooking device based on the temperature converted by the control unit, and the exhaust fan motor It is a range hood that is driven or stopped. By monitoring the entire top plate of the cooking device with a monocular element, the temperature generated when using the cooking device is quickly detected and the exhaust fan motor is linked. Is to do. Moreover, the range hood which does not require the operation part which rotates the pyroelectric type heat sensing element like the past is obtained.

  The invention according to claim 1 of the present invention is a monocular that is installed around a cooking device and exhausts oily smoke and odor generated during cooking to the outside of the room, and a monocular that detects far infrared rays around the cooking device. A thermoelectromotive temperature sensor with a built-in element and a control unit that converts the result detected by the thermoelectromotive temperature sensor into temperature, and the use state of the cooking device based on the temperature converted by the control unit This is a range hood characterized in that the exhaust fan motor is driven or stopped by determining the temperature, and a thermoelectromotive temperature with a built-in monocular element capable of detecting far-infrared rays averaged in the monitoring area The sensor is installed at a position where the entire top plate of the cooking device can be monitored, and the output of the thermoelectric temperature sensor is detected as the temperature by the control unit to determine the usage status of the cooking device. To control the exhaust fan motor with.

  As a result, it is possible to quickly detect the temperature generated when using cooking equipment, and to operate the exhaust fan motor in conjunction with it, and a range that does not require an operating part to rotate the pyroelectric heat detection element as in the past. Food is obtained.

  The invention according to claim 2 of the present invention is characterized in that the previous detected temperature is compared with the next detected temperature detected after a certain time, and the exhaust fan motor is controlled when a certain temperature difference occurs. Compared with the previous detected temperature detected by the control unit and the next detected temperature measured after a certain time, the use status of the cooking device is judged by the relative temperature difference, and the exhaust fan motor is turned on. Control. According to the present invention, it is possible to relatively grasp the change in the object temperature on the cooking device without being influenced by the ambient temperature.

  The invention according to claim 3 of the present invention is the range hood according to claim 2, characterized in that the exhaust fan motor is started when the next detected temperature detected after a predetermined time is higher than the previously detected temperature. Compare the previous detected temperature detected by the control unit with the next detected temperature measured after a certain period of time, and if the detected temperature is higher than the previous time, it is determined that the cooking device has been started and the exhaust fan motor is operated. . According to the present invention, the operation of the exhaust fan motor can be started immediately after the heating of the cooking device is started.

  The invention according to claim 4 of the present invention is characterized in that the exhaust fan motor is stopped when the next detection temperature detected after a predetermined time from the previous detection temperature is low. Compare the previous detected temperature detected by the control unit with the next detected temperature measured after a certain period of time, and if the detected temperature is lower than the previous time, it is determined that the cooking device has been stopped and the exhaust fan motor is turned off. Stop. According to the present invention, the operation of the exhaust fan motor can be stopped in conjunction with the heating stop of the cooking device.

  The invention according to claim 5 of the present invention is characterized in that the operation of the exhaust fan motor is maintained when the next detected temperature detected after a predetermined time from the previous detected temperature is low. Compared with the previous detected temperature detected by the control unit and the next detected temperature measured after a certain time, if the detected temperature is lower than the previous time, it is determined that the heat source was hidden by the lid or human hand, Maintain the operation of the exhaust fan motor for a certain period of time. According to the present invention, the operation of the exhaust fan motor can be stabilized without being affected by a temporary temperature drop.

  The invention according to claim 6 of the present invention is characterized in that the current state of the exhaust fan motor is maintained when there is no constant difference between the previously detected temperature and the next detected temperature detected after a certain time. If the relative temperature difference does not exceed a certain standard, the cooking device is judged to be used continuously and the exhaust fan motor is operated. To maintain. According to the present invention, the exhaust fan motor can be continuously operated even when the heating temperature of the cooking device is stabilized and no temperature change occurs.

  According to the seventh aspect of the present invention, when the amount of change in the next detected temperature detected after a predetermined time and the previously detected temperature exceeds a certain reference, it is determined that the heating of the cooking device has ended, and the exhaust fan motor The range hood according to claim 2, 3, 4, 5 or 6 that controls the temperature of the virtues and IH heaters that are heated to several hundred degrees when a pan or the like heated at the end of cooking is transferred. If the detected temperature changes significantly, such as when a thermo-electromotive force type temperature sensor is detected, or when the heat source is cooled by a cloth, etc., it is judged that cooking has ended and the range that controls the exhaust fan motor Food is obtained.

  The invention according to claim 8 of the present invention is characterized in that the temperature converted by the control unit is corrected according to the relative distance between the thermoelectromotive force type temperature sensor and the cooking device. A range hood as described in 3, 4, 5, 6 or 7 is obtained, and a range hood is obtained in which the detected temperature is corrected according to the positional relationship between the sensor and the heat source, and the detected temperature difference of the heat source caused by the distance is eliminated. .

  The invention according to claim 9 of the present invention is characterized in that the thermoelectric temperature sensor is provided with a protective cover that transmits far-infrared rays to prevent the thermoelectric temperature sensor from being exposed to oily smoke. Item 2, 3, 4, 5, 6, 7 or 8 is a range hood, and the thermoelectromotive force type temperature sensor is protected by a material that transmits far infrared rays, such as polyethylene and silicon, and the thermoelectromotive force type. It can prevent that the detection part of a temperature sensor becomes dirty with oil smoke etc., and detects wrong temperature.

  The invention according to claim 10 of the present invention is characterized in that a lens for transmitting far-infrared rays is provided on the thermoelectric temperature sensor, 2, 3, 4, 5, 6, 7, 8 or 9 The described range hood is formed, and a Fresnel lens is formed of a material that transmits far-infrared rays such as polyethylene and silicon, and a heat source can be detected at a wide angle while protecting the sensor.

  The invention described in claim 11 of the present invention is provided with a smoke sensor, and controls the exhaust fan motor when smoke is detected, according to claim 2, 3, 4, 5, 6, 7, 8 When the smoke sensor provided in the range hood detects smoke or gas, it is determined that the grill is cooked and the exhaust fan motor is controlled. According to the present invention, it is possible to detect use of the grill that cannot be detected by the thermoelectromotive force type temperature sensor, and it is possible to operate the exhaust fan motor in conjunction with it.

  According to a twelfth aspect of the present invention, a humidity sensor is provided, and when the humidity is detected, the exhaust fan motor is controlled. When the humidity sensor provided in the range hood detects moisture, it is determined that the pan is boiling or cooked, and the exhaust fan motor is controlled. According to the present invention, there is provided a range hood capable of controlling the exhaust fan motor by detecting the use state of the cooking device by a change in humidity even if the thermoelectromotive force type temperature sensor detects the temperature of steam or steam. can get.

  According to a thirteenth aspect of the present invention, the exhaust fan motor is a DC motor. The second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, or twelfth aspect. A range hood capable of finely adjusting the exhaust amount of the exhaust fan motor based on the estimation result of the cooking state of the cooking device is obtained.

  Embodiment 1 of the present invention will be described below with reference to the drawings.

(Embodiment 1)
1 to 3 show the range hood of the first embodiment. The range hood 1 is attached to the upper part of the IH cooker 3, and an exhaust fan motor 5 is configured inside the range hood 1. The exhaust fan motor 5 uses the IH cooker 3 to suck up the oil smoke generated when the user cooks and discharges it from the discharge port 7 to the outside. The switch receiving unit 21 is used by the user to manually instruct the operation, stop, and speed switching of the exhaust fan motor 5, and when the user performs a switch operation, the control unit 16 built in the range hood 1 instructs the switching. The exhaust fan motor 5 is controlled based on the above. FIG. 4 is a block diagram showing a control configuration of the range hood 1.

  The sensor unit 4 includes a thermoelectromotive force type temperature sensor 10 in which a Fresnel lens 12 made of, for example, polyethylene and a monocular sensor element 11 are housed, and faces the top plate 2 of the IH cooker 3. A Fresnel lens has a saw-like cross section in which a normal lens is concentrically cut and the thickness is reduced. Perceived as a collection of prisms.

  Here, the thermoelectromotive force type temperature sensor 10 is also called a thermopile, and generates an electromotive force between the metal contacts when the sensor element 11 made of two kinds of metals detects far infrared rays. Based on the amount of electromotive force generated, the object surface temperature and its change can be detected.

  The thermoelectromotive force type temperature sensor 10 is configured to detect far infrared rays emitted from an object via the Fresnel lens 12, and can detect far infrared rays on the top plate 2 in a wide range. In the first embodiment, the range that can be monitored by the thermoelectromotive force type temperature sensor 10 is the monitoring area 8 shown in FIG. The Fresnel lens 12 also serves as protection for the thermoelectromotive temperature sensor 10.

  Next, the heat source detection principle by the thermoelectromotive force type temperature sensor 10 of Embodiment 1 will be described. Far infrared rays 15 radiated from an object in the monitoring area 8 pass through the Fresnel lens 12 and are refracted toward the thermoelectromotive force type temperature sensor 10. The thermoelectromotive force type temperature sensor 10 detects the refracted far infrared ray 15 by the internal sensor element 11 and outputs an analog value corresponding to the detected amount. The analog value corresponding to the detected amount is converted into temperature by the control unit 16.

  Here, in this method, the far infrared ray 15 that reaches the sensor element 11 is attenuated by the transmittance of the Fresnel lens 12, so that the accurate far infrared ray emitted from the object cannot be detected. Moreover, since the sensor element 11 is a single eye and detects the amount of far infrared rays averaged in the monitoring area 8, it cannot detect the far infrared rays of individual objects.

  The simple operation of the heat source detection principle will be described with reference to the example of FIG. The thermoelectromotive force type temperature sensor 10 monitors an area having a radius of 25 CM on the top plate 2 of the IH cooking appliance 3. Here, when the user starts cooking using the frying pan 17 on the right stove and the average temperature of the entire frying pan 17 is about 100 ° C. and the average temperature of the other top plate 2 is 30 ° C., the frying pan The area of 314 square CM and the area of the monitoring area on the top plate is 1962 square CM, and when the temperature is averaged over the entire monitoring area, it is about 41.2 ° C. Further, when the thickness of the Fresnel lens 12 is set to 0.15 MM, the far-infrared transmittance is 85%, so that the average relative temperature detected by the thermoelectromotive force type temperature sensor 10 is 35 ° C. Thus, in this system, the temperature generated by using the IH cooking appliance 3 is regarded as the average relative temperature, and the control unit 16 determines the usage status of the IH cooking appliance 3.

  Further, a distance measuring sensor 18 is mounted on the back side of the range hood 1 so as to face the top plate of the IH cooking device 3, and infrared rays 23 emitted from the distance measuring sensor 18 are reflected by the top plate 2, Returning to the distance measuring sensor 18 again, the distance between the IH cooking device 3 and the distance measuring sensor 18 is measured from the infrared incident angle at that time.

  In the case of the average relative temperature detection according to the first embodiment, since the detected temperature changes depending on the mounting height of the device, the control unit 16 uses the thermoelectromotive temperature sensor 10 based on the distance measured by the distance measuring sensor 18. Correct the temperature to be measured. For example, in FIG. 6, when the distance between the IH cooking appliance 3 and the thermoelectromotive force sensor 10 is 100 CM and the monitoring area is 3215 parallel CM (area of radius 32 CM), the thermoelectromotive force is considered in the example of FIG. The flat air relative temperature detected by the mold temperature sensor 10 is about 31.2 ° C. In this case, when the distance between the IH cooking device 3 and the distance measuring sensor 18 is 100 CM, the average relative temperature detected at about 3.8 ° C. can be added as a correction, and variations due to the distance can be eliminated.

  Next, a method for controlling the exhaust fan motor 5 according to the first embodiment will be described with reference to FIG. The exhaust fan motor 5 is controlled based on the result of determining the usage status of the IH cooking appliance 3 by the control unit 16. In the case of this Embodiment 1, the control part 16 compares the average relative temperature measured last time every minute and the average relative temperature measured next time, and determines the use condition of the IH cooking appliance 3. FIG. FIG. 7 is a graph (vertical axis: average relative temperature, horizontal axis: time) in which the control unit 16 detects the average relative temperature 19 from the output of the thermoelectromotive force type temperature sensor 10 when the pan cooking is started on the right stove. .

  Timing A is when the user uses the IH cooking device 3 to start cooking the pan, the exhaust fan motor 5 is stopped, and the average relative temperature detected by the control unit 16 is 30 ° C.

  Next, at the timing B, the temperature of the pan is increasing and the average relative temperature is 32 ° C. At this time, the control unit 16 compares the average relative temperatures of the timing A and the timing B, and the IH cooking device 3 is used because there is an increase of 2 ° C. and the average relative temperature 22 is in the process of increasing. And the operation of the exhaust fan motor 5 is started.

  Here, the motor of the exhaust fan motor 5 is an AC motor, and the control unit 16 increases the exhaust air volume for each step with respect to an average relative temperature increase of 2 ° C. The speed control has three stages in all, and possesses exhaust capacity of 100M3 / h, 250M3 / h, and 350M3 / h, respectively. Therefore, at timing B, the operation is started at the smallest displacement 100M3 / h.

  Next, at timing C, the temperature continues to increase from timing B, and the average relative temperature is 34 ° C. Here, the control unit 16 determines that the average relative temperature rise is 2 ° C. from the timing B, and starts the operation at the displacement of 250 M3 / h.

  Next, at timing D, the temperature is rising from timing C, and the average relative temperature is 35 ° C. In the control unit 16, the temperature is increasing from the timing B, but since the relative temperature increase is 1 ° C. with respect to the timing B, the operation at the displacement of 250M3 / h is maintained.

  Next, at timing E, the average relative temperature is 35 ° C., and there is no change from timing D. At this time, the cooking pot is starting to boil, and it can be said that the temperature rise of the cooking pot and contents is stable. The control unit 16 maintains the operation at the displacement of 250 M3 / h because the average relative temperature is stable.

  Next, at timing F, the temperature decreases from timing E, and the average relative temperature is 34 ° C. At this time, it is considered that a temporary temperature drop has occurred, for example, the cooking pan has been capped or new food has been placed in the pan. Here, the control unit 16 confirms the temperature decrease from the previous detection timing E to the next detection timing G when the detected average relative temperature is decreased, and the exhaust air volume is not changed until the temperature decrease of 3 ° C. occurs. It works to lower by one step. Therefore, at timing F, the engine operates to maintain the displacement of 250 M3 / h.

  Next, at timing G, since there is no large temperature change from timing F and it is stable, the control unit 16 maintains the operation with the displacement of 250 M3 / h.

  Next, at timing H 1, it is assumed that the pan has boiled again or another heat source has been generated. However, the detected average relative temperature is 35 ° C., and the control unit 16 maintains the operation with the displacement of 250 M3 / h.

  Next, at the timing I, the average relative temperature increases greatly with respect to the timing H and reaches 46 ° C. Here, since the cooked and boiled pan has been moved from the IH cooking device 3, the high temperature portion of the heating unit 6 is detected by the thermoelectromotive force type temperature sensor 10. This can be judged from the fact that the average relative temperature rose instantaneously from timing H to timing I. In the case of an IH cooking appliance, the temperature of the heating unit rises to about 350 to 400 ° C., and thus corresponds to an average relative temperature of 56 ° C. to 64 ° C. in the heat source detection principle of the first embodiment. Needless to say, the cooking appliance is a gas stove. In the case of the range hood according to the first embodiment, when the average relative temperature has a relative difference of 10 ° C. or more between the previous detected temperature and the next detected temperature, it is determined that the cooking has ended. Accordingly, the control unit 16 determines that the average relative temperature 22 is rising at the timing I, but has finished cooking from the temperature rise instantaneously from the timing H to the timing I, and does not increase the exhaust air volume. The part 16 maintains the operation with a displacement of 250 M3 / h.

  Next, at the timing J, the temperature gradually decreases from the timing I when cooking is completed, but the control unit 16 continues to monitor the state until the next timing K, similarly to the timing F, and maintains the operation of the exhaust amount 250M3 / h. .

  Next, at the timing K, the temperature continuously decreases from the timing I, and since the average relative temperature has decreased by 7 ° C. or more from the timing I, the exhaust air volume is decreased by one step, and the exhaust fan motor at an exhaust volume of 100 M3 / h. Drive 5

  Next, at the timing L, the temperature continues to decrease from the timing K. However, like the timing F, the control unit 16 continues to monitor the state until the next timing M, and maintains the operation of the displacement 100M3 / h.

  Next, at timing M, the temperature continues to decrease from timing L, and since the average relative temperature has decreased by 3 ° C. or more from timing K, the exhaust air volume is decreased by one step. When reaching the stop of the motor 5, the operation of the exhaust amount of 100M3 / h is continuously maintained until the average relative temperature of 32 ° C. at the timing B when the operation of the exhaust fan motor 5 is started. For this reason, the exhaust fan motor 5 is not stopped at the timing M.

  Thereafter, the IH cooking appliance is not used, and the average relative temperature 22 continues to decrease at timings N, O, and P, and falls below the average relative temperature of 32 ° C. at which the exhaust operation is started for the first time at timing R. The fan motor 5 is stopped.

  As described above, the range hood of the first embodiment is attached at a position where the sensor unit 4 constituted by the thermoelectromotive force type temperature sensor 10 incorporating the Fresnel lens 12 and the sensor element 11 faces the IH cooking appliance 3, The control unit 16 detects the average relative temperature on the top plate 2 of the IH cooking appliance 3 based on the far infrared rays detected by the thermoelectromotive force type temperature sensor 10, and operates the exhaust fan motor 5 based on the average relative temperature. Controls the exhaust fan motor according to the usage status of the IH cooker, and it does not require complicated calculation processing and instantaneously detects the occurrence of a high-temperature part to operate the exhaust fan motor in conjunction. Is possible. It is possible to provide a range hood that can quickly exhaust heat generated during cooking, heat exhausted from cooking, exhaust of oily smoke and odor generated during cooking, and cooking exhaust.

  The Fresnel sensor 12 is made of polyethylene that transmits far-infrared rays, condenses the far-infrared rays of the object widely, and realizes protection of the thermoelectric temperature sensor 10. Here, the material of the Fresnel sensor 12 may be any material as long as it transmits far-infrared rays. In addition to polyethylene, the same configuration can be used with silicon. However, in this case, the transmittance is different, so the detection temperature needs to be corrected. It becomes.

  In addition, the distance measuring sensor 18 is attached at a position facing the IH cooking appliance 3, the distance between the IH cooking appliance 3 and the range hood 1 is measured, and the average relative temperature detected by the control unit 16 is corrected according to the measurement result. Is added, it is possible to detect a stable average relative temperature regardless of how the distance between the range hood 1 and the IH cooking appliance 3 changes. Here, the correction means can be realized without using a distance measuring sensor if there is a means for storing the distance between the range hood 1 and the IH cooking device 3 in the control unit 16 after the installation of the range hood is completed.

  Moreover, the control part 16 judges the use condition of the IH cooking appliance 3 from the change of the average relative temperature to detect, and determines the exhaust air volume of the exhaust fan motor 5 according to the temperature change amount. The control unit 16 compares the previous detected temperature with the next detected temperature, and determines that the IH cooking appliance 3 is in use if the next detected temperature is increasing. If there is a temperature rise of 2 ° C or more and less than 4 ° C from the previous detected temperature, the exhaust fan motor 5 starts to operate at an exhaust air flow rate of 100M3 / h, which is the lowest speed control. If the temperature is 4 ° C or higher and lower than 6 ° C, operation starts at an exhaust air flow rate of 250M3 / h, which is an intermediate speed. If the next detected temperature is 6 ° C or higher and lower than 8 ° C, the highest speed is adjusted. The operation is started at a certain exhaust air flow 350M3 / h.

  Further, the control unit 16 determines that the use of the IH cooking appliance 3 is finished if the next detected temperature is decreasing. Next, the previously detected temperature is compared with the detected temperature one after another, and if there is a temperature drop of 3 ° C. or more, the exhaust air volume is decreased by one speed. However, if the vehicle is operating at the lowest speed, the operation is not stopped until the temperature detected at the time when the operation is started is reached.

  Further, if the motor of the exhaust fan motor 5 is a DC motor, it becomes possible to increase the resolution of the detected temperature and adjust the exhaust air volume in response to fine temperature changes.

(Embodiment 2)
The second embodiment will be described with reference to FIG. The same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The smoke sensor 23 is configured so as to face the top plate of the IH cooker 3 on the back side of the range hood 1 wall.

  In the smoke sensor 23, the element inside the sensor is made of a resistor, and is heated to a high temperature of about several hundred degrees Celsius by a heater. When reducing gas (CO, CH, etc.) enters the sensor, it reacts with oxygen atoms (O2) on the element surface, and the resistance value of the element changes. When the amount of change exceeds the reference value, the sensor outputs a signal.

  In the above configuration, the operation of the range hood will be described with reference to the flowchart shown in FIG.

  When power is applied to the range hood, power is applied to the control unit 16. When power is applied to the control unit 16, a program of a microcomputer (not shown) arranged in the control unit 16 starts processing. When reading of the thermoelectromotive force type temperature sensor 10 (hereinafter referred to as a thermopile) and the smoke sensor 23 is started and, for example, fish is baked on the grill inside the IH stove, the smoke is exhausted from the exhaust port of the IH stove. When the smoke is exhausted from the exhaust port, the smoke sensor 23 provided in the range hood 1 starts detection. When the threshold value preset in the microcomputer is exceeded, the exhaust fan motor 5 is operated at the highest speed, and the exhaust air flow 350M3 is the highest speed. The operation starts at / h.

  When the exhaust fan motor 5 is operated at an exhaust air volume of 350 M3 / h, which is the highest speed adjustment, and the output value of the smoke sensor 23 tends to increase, the exhaust air volume of 350 M3 / h, which is the highest speed adjustment, is continued. Further, when the output value of the smoke sensor 23 falls gently, the notch is varied to an exhaust air volume of 250 M3 / h, which is an intermediate speed control. Further, when the output value of the smoke sensor 23 is approaching the output value when the exhaust fan motor 5 is operated, the operation is performed at 100 M3 / h which is the lowest speed by predicting that the fish is burnt and cooking is finished. For example, the exhaust fan motor 5 is stopped after the remaining operation for 3 minutes.

  The range hood configured as described above can monitor the area on the top plate with a thermopile provided in the range hood, and can control the exhaust fan motor in accordance with the usage status of the IH cooker.

  In addition, the smoke sensor attached to the range hood reliably detects cooking smoke using smoke that cannot be detected by the thermopile (smoke discharged from the exhaust port of the IH cooker), and bothers the user. Smoke can be discharged by the exhaust fan motor without any trouble, and a comfortable range hood that matches the dish can be provided without leaving an unpleasant smell generated by the dish or the like to the range hood user.

(Embodiment 3)
A third embodiment will be described with reference to FIG. The same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The humidity sensor 24 is configured to be provided in a shape facing the top plate of the IH cooker 3 on the back side of the range hood 1 wall.

  There are two types of humidity sensor 24, a resistance change type humidity sensor and a capacitance change type humidity sensor, both of which use a moisture sensitive material that absorbs and dehumidifies moisture, and has a structure that bridges between electrodes. It has become.

  Briefly, the comb-shaped electrodes face each other without contact. There is a moisture sensitive film at the bridge of the electrode, and the resistance changes due to the moisture absorption and desorption of the moisture sensitive film. The resistance value increases as humidity decreases, and the resistance value decreases as humidity increases. That is, when the humidity is high (there is a lot of moisture), electricity flows well. Conversely, when the humidity is low or when there is no moisture, it is impossible to bridge electricity and the resistance value becomes infinite.

  In the above configuration, the operation of the range hood will be described with reference to the flowchart shown in FIG. When power is applied to the range hood, power is applied to the control unit 16. When power is applied to the control unit 16, a program of a microcomputer (not shown) arranged in the control unit 16 starts processing. Reading of the thermoelectromotive force type temperature sensor 10 (hereinafter, thermopile) and the humidity sensor 24 is started. Here, a case where a pot (not shown) is cooked on the top plate 2 of the IH cooking device 3 will be described as an example. When the user using the IH cooker 3 is cooking on the right stove, there is no change in the humidity sensor 24 at the beginning of cooking, a change appears in the thermopile, and the range hood is operated based on the information on the thermopile. After the time has passed, when the cooking of the pot is nearing completion and the pot is boiling, steam is discharged from the pot. When the steam is discharged, the thermopile can no longer see a temperature change due to the steam, so the output of the humidity sensor 24 is confirmed. When the temperature change of the thermopile disappears and the output value of the humidity sensor is high (for example, 80% or more), it is assumed that the user is still cooking the pot food, and the exhaust fan motor 5 is set to the highest speed exhaust air flow 350M3. Continue driving at / h.

  When the exhaust fan motor 5 is operated at an exhaust air volume of 350 M3 / h, which is the highest speed adjustment, and the output value of the humidity sensor 24 tends to increase (80% or more), the exhaust air volume of 350 M3 / h, which is the highest speed adjustment. Continue. Further, when the output value of the humidity sensor 24 decreases gently (40% or more and less than 80%), the notch is changed to an exhaust air volume of 250 M3 / h, which is an intermediate speed control. In addition, when the output value of the humidity sensor 24 is close to the output value when the exhaust fan motor 5 is operated (humidity first started to be detected), it is predicted that the cooking of the pot will be finished, and the lowest speed is adjusted. The operation is performed at a certain 100 M3 / h, and the exhaust fan motor 5 is stopped after, for example, a remaining operation for 3 minutes.

  The range hood configured as described above can monitor the area on the top plate with a thermopile provided in the range hood, and can control the exhaust fan motor in accordance with the usage status of the IH cooker.

  In addition, even if the thermopile cannot be detected by steam with the humidity sensor provided in the range hood, the user can reliably detect the steam based on the steam discharged from the pan. The exhaust fan motor can discharge steam without bothering the user, and it is possible to provide a comfortable range hood that matches the dish without leaving an unpleasant smell generated in the dish or the like to the range hood user.

  The range hood fan according to the present invention can provide a range hood fan that has few failures and excellent durability and is automatically set to an appropriate displacement. It can also be applied.

The figure which shows the range hood of Embodiment 1 of this invention External view of the same range hood ((a) Front view, (b) Side view, (c) Top view) Internal configuration diagram of the thermoelectromotive force type temperature sensor ((a) side view, (b) front view) Block diagram The figure which shows the monitoring range of the thermoelectromotive force type temperature sensor Diagram showing sensor detection configuration The figure which shows the same heat source detection state and fan operation state The figure which shows the range hood of Embodiment 2 of this invention Flow chart showing the operation of the same range hood The figure which shows the range hood of Embodiment 3 of this invention Flow chart showing the operation of the same range hood

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Range hood 2 Top plate 3 IH cooking equipment 4 Sensor unit 5 Exhaust fan motor 6 Heating part 7 Discharge port 8 Monitoring area 9 Pan 10 Thermoelectromotive force type temperature sensor 11 Sensor element 12 Fresnel lens 15 Far infrared ray 16 Control part 17 Fry pan 18 Ranging sensor 21 Switch receiving part

Claims (13)

An exhaust fan motor that is installed around the cooking device and exhausts the smoke and odor generated during cooking to the outside of the room, and a thermoelectromotive force type temperature sensor that incorporates a monocular element that detects far infrared rays around the cooking device A control unit that converts the result detected by the thermoelectromotive force type temperature sensor into a temperature, and drives the exhaust fan motor by judging the use state of the cooking device based on the temperature converted by the control unit, or Range hood characterized by stopping. 2. The range hood according to claim 1, wherein the previous detected temperature is compared with the next detected temperature detected after a certain time, and the exhaust fan motor is controlled when a certain temperature difference occurs. 3. The range hood according to claim 2, wherein when the next detected temperature detected after a certain time from the previous detected temperature is high, the exhaust fan motor is started to operate. The range hood according to claim 2 or 3, wherein the operation of the exhaust fan motor is stopped when the next detection temperature detected after a certain time from the previous detection temperature is low. The range hood according to claim 2 or 3, wherein the operation of the exhaust fan motor is maintained when the next detected temperature detected after a certain time from the previous detected temperature is low. 6. The range hood according to claim 2, wherein the current state of the exhaust fan motor is maintained when there is no constant difference between the previous detection temperature and the next detection temperature detected after a predetermined time. The exhaust fan motor is controlled when it is determined that the overheating of the cooking device has ended when the amount of change in the previous detected temperature and the next detected temperature detected after a certain time exceeds a certain reference. 5 or 6 range hood. The range according to claim 2, 3, 4, 5, 6 or 7, wherein the temperature converted by the control unit is corrected according to a relative distance between the thermoelectromotive force type temperature sensor and the cooking device. hood. The thermoelectromotive force type temperature sensor is provided with a protective cover that transmits far-infrared rays to prevent the thermoelectromotive force type temperature sensor from being exposed to oily smoke. Or the range hood of 8. The range hood according to claim 2, 3, 4, 5, 6, 7, 8 or 9, wherein a thermo-electromotive force type temperature sensor is provided with a lens that transmits far infrared rays. 11. The range hood according to claim 2, further comprising a smoke sensor, wherein when the smoke is detected, the exhaust fan motor is controlled. The range hood according to claim 2, further comprising a humidity sensor, wherein when the humidity is detected, the exhaust fan motor is controlled. The range hood according to claim 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12, wherein the exhaust fan motor is a DC motor.

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