JP2005016831A - High frequency heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a trouble due to dew condensation on a temperature detecting means and the deposition of dirt. <P>SOLUTION: This high frequency heating cooker comprises a heating chamber 1, a magnetron 2, a cooling means 3 for cooing the magnetron 2, an air guide 4 for guiding exhaust air 8 into the heating chamber 1 after cooling the magnetron 2, the temperature detecting means 5 for detecting the temperature of the exhaust air 8 from the magnetron 2, a control means 6 for controlling the output of the magnetron 2 in accordance with the temperature information, and a lighting means 7 for lighting the inside of the heating chamber. The lighting means 7 is arranged in the air guide 4 near the temperature detecting means 5 for keeping the temperature detecting means 7 in a consistently dry and good condition with hot air from the lighting means 7 lit on during cooking, without causing dew condensation thereon. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for preventing a failure due to a temperature rise of a magnetron by an attachment position of a temperature detection means of an induction heating cooker and an intake air blockage.
[0002]
[Prior art]
In the conventional high-frequency heating cooker, in order to detect the temperature of the exhaust air after cooling the magnetron, the temperature detecting means is attached in the air guide near the punching hole where the exhaust air passes through the path through which the exhaust air passes ( For example, see Patent Document 1).
[0003]
FIG. 6 shows a conventional high-frequency heating cooker described in Patent Document 1. As shown in FIG.
[0004]
In FIG. 6, 1 is a heating chamber, 2 is a magnetron, 3 is cooling means, 4 is an air guide, 5 is temperature detection means, 8 is exhaust air, and 9 is a punching hole.
[0005]
[Patent Document 1]
Japanese Laid-Open Patent Publication No. 6-185738
[Problems to be solved by the invention]
However, in the case of a configuration such as a conventional high-frequency cooking device, oven cooking or toast cooking is performed in a state where the cooling means is stopped, and steam generated from the heated food flows backward from the heating chamber. When passing through the punching hole, there is no obstruction in the vicinity of the temperature detecting means, and the vapor adheres and condenses as it is.
[0007]
As a result, when the microwave cooking is performed after that, the accuracy of the temperature detection means is remarkably deteriorated, or the temperature detection means may be short-circuited and broken.
[0008]
The present invention solves the above-mentioned conventional problems, and when oven cooking or toast cooking is performed in a state where the cooling means is stopped, steam generated from the heated food flows backward from the heating chamber to form punching holes. Even if it passes, the lighting means is arranged near the temperature detection means in the air guide, so that the temperature detection means is always kept in a dry and good state by the hot air of the lighting means that is lit during cooking. The object is to realize a high-frequency heating cooker that can be used.
[0009]
In addition, when viewed from the punching hole side, the temperature detection means is disposed behind the illumination means, so that it is less likely to be affected by the steam that has flowed backward from the heating chamber and passed through the punching hole, and is less likely to be contaminated. An object of the present invention is to provide a high-frequency heating cooker that can always be used in an environment where the temperature detection means is accurate and difficult to break.
[0010]
[Means for Solving the Problems]
In order to solve the above-described conventional problems, the high-frequency cooking device of the present invention includes a heating chamber, a magnetron, a cooling means for cooling the magnetron, and an air that guides exhaust air after cooling the magnetron to the heating chamber. A guide, temperature detection means for detecting the temperature of the exhaust air from the magnetron, control means for controlling the output of the magnetron based on the temperature information, and illumination means for illuminating the inside of the heating chamber, The illumination means is arranged near the temperature detection means in the air guide, so that the temperature detection means is always kept in a dry and good state without condensation due to the hot air of the illumination means that is lit during cooking. A cooking device can be realized.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 is a heating chamber, a magnetron, a cooling means for cooling the magnetron, an air guide for guiding the exhaust air after cooling the magnetron to the heating chamber, and the temperature of the exhaust air from the magnetron. Temperature detecting means for detecting the temperature, control means for controlling the output of the magnetron based on the temperature information, and illumination means for illuminating the inside of the heating chamber, wherein the illumination means is a temperature in the air guide. By using a high-frequency heating cooker arranged in the vicinity of the detection means, the steam generated from the cooked food is caused to flow backward from the heating chamber by oven cooking or toast cooking where cooking is performed with the cooling means stopped. Even if you go through the punching hole, keep the temperature detection means dry and in good condition without any condensation due to the hot air from the lighting means that is lit during cooking. It can be.
[0012]
According to a second aspect of the present invention, there is provided the microwave cooking device according to the first aspect, in which the temperature detecting means is disposed in the air guide above the exhaust air rather than the illuminating means. At this time, the temperature of the exhaust air from the magnetron can be accurately detected without being affected by the hot air from the lighting means that is lit during cooking.
[0013]
The invention according to claim 3 is configured such that the temperature detection means is disposed behind the illumination means when viewed from the punching hole side provided on the side surface of the heating chamber, and is not easily affected by the steam from the inside of the chamber. By using the high-frequency heating cooker according to claim 1 or 2, steam generated from a heated cooked product flows backward from the heating chamber by oven cooking or toast cooking in which cooking is performed with the cooling means stopped. Even when the punching hole is passed through, it is difficult to be affected by the steam, and it is difficult to be contaminated, so that the temperature detecting means can always be used in an environment where the temperature detecting means is accurate and hardly broken.
[0014]
The invention according to claim 4 is characterized in that the control means performs output control or abnormality detection control of the magnetron based on temperature information after a predetermined time has elapsed after the start of cooking. By using the high-frequency heating cooker according to any one of the above items, the hot air from the heater cooking or the hot air from the illumination means is trapped around the temperature detection means by oven cooking or toast cooking in which the cooling means is stopped. Even if the cooling means rotates after the start of cooking, the hot air around the temperature detecting means is pushed from the air guide through the punching hole to the heating chamber. Therefore, it is possible to accurately detect the temperature of the exhaust air from the pure magnetron after removing hot air, and to control the output of the magnetron or control the abnormality. .
[0015]
According to a fifth aspect of the present invention, in the high frequency heating cooker according to the fourth aspect, the abnormality detection control detects the intake blockage state based on the exhaust temperature of the magnetron. Although the temperature of the air sucked by the air is low, if the air intake is clogged with dust, or if a cloth or sheet is stuck and sufficient airflow sufficient for cooling capacity is not obtained, the temperature of the magnetron will rise and exhaust The temperature also rises. Therefore, it can be detected by determining that the intake is blocked.
[0016]
The invention described in claim 6 is characterized in that the control means detects that the predetermined temperature has been exceeded, reduces the output of the magnetron, and performs an error display to call attention after completion of cooking. Or, by using the high-frequency heating cooker described in 5, it is used in an environment in which sufficient cooling capacity cannot be obtained due to air intake blockage and the temperature of the magnetron rises during cooking and there is a risk of failure. This is notified to the consumer as an error display after the cooking is completed, and the consumer who sees the display removes the cause of the air intake obstruction, thereby preventing the magnetron from being broken.
[0017]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
(Example 1)
FIG. 1 is an upper cross-sectional view of a cooking device according to an embodiment of the present invention. FIG. 2 is a perspective view of the heating cooker in the embodiment of the present invention. FIG. 3 is an enlarged view of the upper cross section of the cooking device according to the embodiment of the present invention. FIG. 4 is a view from above of the temperature detection means 5 attached to the air guide 4 of the cooking device according to the embodiment of the present invention. In the figure, the cooking device includes a heating chamber 1, a magnetron 2, a cooling means 3 for cooling the magnetron 2, an air guide 4 for guiding the exhaust air 8 after cooling the magnetron 2 to the heating chamber 1, Temperature detecting means 5 for detecting the temperature of the exhaust air 8 (for example, a thermistor capable of reading a change in resistance value due to temperature as temperature information) and control for controlling the output of the magnetron 2 based on the temperature information Means 6, illumination means 7 that illuminates the inside of the heating chamber 1, and punching holes 9 provided in the side surface of the heating chamber 1, the illumination means 7 is disposed in the vicinity of the temperature detection means 5 in the air guide 4, The temperature detection means 5 is located in the air guide 4 at a position where the temperature information of the exhaust air 8 on the upper side of the exhaust air 8 and the upper side from the magnetron 2 can be detected. From the guide 4 and the positional relation of the magnetron 2, an air guide upward, when viewed from the punching hole 9 side, and has a disposed position where the rear lighting means 7 configured.
[0019]
Further, the temperature detection means 5 has a configuration in which the thermistor 11 is mounted on the P plate 12 and is disposed on the air guide 4. The exhaust air 8 is blown to the temperature detection means 5, whereby temperature information is detected by the thermistor 11, and the temperature information is transmitted to the control means 6 via the lead wire 15.
[0020]
The operation and action will be described below.
[0021]
When microwave cooking is performed, each part is controlled by the control means 6, the magnetron 2 oscillates, the cooling means 3 starts rotating, and the illumination means is lit. Then, the cold air sucked from the outside by the cooling means 3 is blown to the magnetron 2, and then the exhaust air 8 passing through while cooling the magnetron 2 is guided to the air guide 4, passes through the punching holes 9, and enters the heating chamber 1. And flow into. At this time, the exhaust air 8 is blown to the temperature detection means 5 and the illumination means 7 disposed in the air guide 4. Since the exhaust air 8 is a wind after cooling the magnetron 2, the temperature of the exhaust air 8 is naturally low when the temperature of the magnetron 2 is low, and the temperature of the exhaust air 8 is high when the temperature of the magnetron 2 is high. Therefore, by detecting the temperature information of the exhaust air 8 blown to the temperature detection means 5, the temperature state of the magnetron can be grasped, and the output of the magnetron 2 is controlled by the control means 6 according to the state, so that the optimum state is obtained. The magnetron 2 can be controlled.
[0022]
Further, since the high temperature air flows on the upper side and the low temperature air flows on the lower side, the temperature information of the exhaust air 8 flowing on the upper side of the magnetron 2 is detected as much as possible in order to detect the highest temperature information of the magnetron 2. It goes without saying that it is better. From the above, in this embodiment, the temperature detecting means 5 is arranged in the air guide 4 above the exhaust air 8 rather than the illuminating means 7 so that it is not affected by the hot air from the illuminating means 7. The temperature information of only the exhaust air 8 from the magnetron 2 can be accurately detected. Further, since the temperature detecting means 5 is disposed above the air guide 4 based on the positional relationship between the magnetron 2 and the air guide 4, the temperature of the high-temperature exhaust air 8 from the magnetron 2 can be detected. It has a configuration.
[0023]
Next, in cooking using a heater, cooking is normally performed with the cooling means 3 stopped in order to prevent cold air from flowing into the heating chamber 1 through the punching hole 9 during cooking that normally heats the food. Is often done. Accordingly, in the oven cooking or toast cooking in which the illumination means 7 is turned on and the magnetron 2 and the cooling means 3 are stopped, the steam 10 generated from the heated food is stopped because the cooling means 3 is stopped. It flows backward through the punching hole 9 and flows into the air guide. As a result, the thermistor 11 portion which is the temperature detecting means 5 is condensed, and the terminals A13 and B14 are short-circuited by water droplets, and the temperature detecting means 5 may be broken.
[0024]
However, in this embodiment, the illumination means 7 is disposed in the vicinity of the temperature detection means 5 in the air guide 4 so that the steam 10 is evaporated by the hot air of the illumination means 7 during cooking and the temperature detection means 5 is always dry. In good condition.
[0025]
Further, when viewed from the punching hole 9 side, by arranging the temperature detection means 5 behind the illumination means 7, the temperature detection means 5 is hardly affected by the steam 10 flowing from the heating chamber 1, Further, it is possible to make it difficult to get dirt, and the temperature detection means 5 can be used in an environment that is always more accurate and less likely to break.
[0026]
Next, the control of this embodiment will be described.
[0027]
FIG. 5 is a flowchart showing one control example of the heating cooker in the embodiment of the present invention. In FIG. 5, the control means 6 determines in step 1 whether or not a predetermined time has elapsed from the start of output of the magnetron 2. If the predetermined time has not elapsed, the process proceeds to step 5. If the predetermined time has elapsed, the process proceeds to step 2 to determine whether or not the temperature detected by the temperature detecting means 5 is equal to or higher than the predetermined temperature. If the temperature is not higher than the predetermined temperature, the process proceeds to step 5. If the temperature is higher than the predetermined temperature, it is determined that the magnetron 2 may fail because the sufficient air volume cannot be obtained due to the air intake blockage and the ability to cool the magnetron 2 is reduced. In step 3, the output of the magnetron 2 is reduced. Processing is performed, and a detection flag for detecting an intake air blockage in step 4 is set. Thereafter, in step 5, it is determined whether or not cooking is finished. If cooking is not finished, the process proceeds to END. In the case of the end of cooking, the process proceeds to step 6 and it is determined whether or not the detection flag for detecting the intake blockage is set. If the detection flag is not set, the process proceeds to END. If the detection flag is set, the routine proceeds to step 7, where an error display is made to notify that the intake air blockage state has been detected during cooking and that the output of the magnetron 2 has been reduced.
[0028]
With the above-described configuration, after a predetermined time has elapsed from the start of output of the magnetron 2, the state in which the temperature detected by the temperature detection means 5 becomes equal to or higher than the predetermined temperature is set by the cooling means 3. It is judged that the intake portion to be sucked is clogged with dust, or that something like a sheet or cloth is blocking the intake portion and the intake portion is blocked, and the output of the magnetron 2 is reduced to reduce the magnetron. 2 can be prevented in advance. (This is because the sufficient air volume cannot be obtained due to the intake blockage and the ability to cool the magnetron 2 is lowered. May reduce the output of magnetron 2).
[0029]
In addition, if it is determined during cooking that an intake blockage has occurred, an error display is displayed after cooking is completed, so that the device can be used in an unsafe environment where the intake blockage occurs to the consumer. Let them know that they are being used. Then, by cleaning the intake part or removing the thing blocking the intake part, it is possible to prevent the device from being used in an unsafe environment indefinitely.
[0030]
In addition, a mask time is provided so as not to determine whether or not the temperature is higher than a predetermined temperature until a predetermined time has passed after the output of the magnetron 2 is started, for example, using a heater such as oven cooking or toast cooking In the case of cooking, hot air is trapped around the upper portion of the air guide 4, just around the temperature detection means 5 and the illumination means 7 due to radiant heat and convection. And when microwave cooking is performed after that, the cooling means 3 begins to rotate with the start of cooking, and the hot air that has been trapped in the air guide 4 together with the exhaust air 8 from the magnetron 2 is blown to the temperature detecting means 5. Become.
[0031]
Therefore, if temperature detection is started at the same time as the output of the magnetron 2 is started, the hot air blown to the temperature detection means 5 is in a closed state in spite of being used in a safe state. If the temperature of the magnetron 2 is high and the temperature of the exhaust air 8 is high, it may be erroneously detected. Therefore, by providing a predetermined mask time from the start of output of the magnetron 2, the temperature detection means 5 False detection can be prevented.
[0032]
Since these steps are examples, a system that can be easily programmed, including judgment criteria, may be used. In some cases, judgment may not be necessary. Alternatively, the determination order may be changed.
[0033]
Moreover, what is necessary is just to combine freely the combination of how to judge above and below, and condition judgment according to how to use.
[0034]
In addition, it goes without saying that convenience is increased by making values such as time determination and temperature determination changeable. Further, depending on the actual usage, the output reduction processing of the magnetron 2 may be performed a plurality of times to reduce the output step by step, or the output reduction may be limited to one time. Furthermore, a part or all of the constituent means of the temperature detection means 5 and the control means 6 can be performed by a microcomputer.
[0035]
【The invention's effect】
As described above, according to the invention described in any one of claims 1 to 6, the heating chamber, the magnetron, the cooling means for cooling the magnetron, and the air for guiding the exhaust air after cooling the magnetron to the heating chamber A guide, temperature detection means for detecting the temperature of the exhaust air of the magnetron, control means for controlling the output of the magnetron based on the temperature information, and illumination means for illuminating the inside of the heating chamber, the illumination means By arranging it near the temperature detection means in the air guide, it is possible to keep the temperature detection means in a dry and good state without any condensation due to the hot air of the lighting means that is lit during cooking.
[0036]
In addition, the temperature detection means is arranged in the air guide above the exhaust air than the illumination means, so that the temperature of the exhaust air from the magnetron can be accurately detected without being affected by the hot air from the illumination means. Can do.
[0037]
In addition, when the temperature detection means is viewed from the side of the punching hole provided on the side surface of the heating chamber, the temperature detection means is disposed behind the illumination means, so that the influence of the steam that has flowed back from the heating chamber and passed through the punching hole. The temperature detection means can always be used in an environment that is accurate and hardly broken.
[Brief description of the drawings]
FIG. 1 is a top sectional view of a heating cooker according to an embodiment of the present invention. FIG. 2 is a perspective view of a heating cooker according to an embodiment of the present invention. FIG. 4 is a side view of temperature detecting means attached to the air guide of the cooking device according to the embodiment of the present invention. FIG. 5 is a flowchart showing a control example of the cooking device according to the embodiment of the present invention. FIG. 6 is a top view of a conventional high-frequency cooking device described in the publication.
DESCRIPTION OF SYMBOLS 1 Heating chamber 2 Magnetron 3 Cooling means 4 Air guide 5 Temperature detection means 6 Control means 7 Illumination means 8 Exhaust air 9 Punching hole 10 Steam / hot air 11 Thermistor 12 P board 13 to which the thermistor is attached Terminal A
14 Terminal B
15 Lead wire

Claims (6)

A heating chamber, a magnetron, cooling means for cooling the magnetron, an air guide for guiding the exhaust air after cooling the magnetron to the heating chamber, temperature detecting means for detecting the temperature of the exhaust air of the magnetron, and Control means for controlling the output of the magnetron and the like based on temperature information, and illumination means for illuminating the inside of the heating chamber, the illumination means being disposed in the vicinity of the temperature detection means in the air guide A high frequency heating cooker characterized by. The high-frequency cooking device according to claim 1, wherein the temperature detection means is disposed in the air guide above the exhaust air than the illumination means. 3. The temperature detection means according to claim 1, wherein the temperature detection means is disposed behind the illumination means when viewed from a punching hole side provided on a side surface of the heating chamber, and is not easily affected by steam from the inside of the chamber. High frequency cooking device. The high-frequency heating according to any one of claims 1 to 3, wherein the control means performs output control or abnormality detection control of the magnetron based on temperature information after a predetermined time has elapsed after the start of cooking. Cooking device. The high frequency cooking device according to claim 4, wherein the abnormality detection control detects an intake air blockage based on an exhaust temperature of the magnetron. The high-frequency cooking device according to claim 4 or 5, wherein the control means reduces the output of the magnetron when a predetermined temperature is exceeded and displays an error message to call attention after the cooking is finished.

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