JP5642113B2 - Cooker - Google Patents

Description

  The present invention relates to a cooking device, and more particularly to a built-in cooking device in which a heating chamber having an openable / closable door is provided on a lower front surface of a countertop.

  In general, as shown in FIG. 7, a gas stove as a built-in type heating cooker has a grill box as a heating chamber provided in the stove body 131 on the front surface of the stove body 131 located below the counter top 111. 3 and the door 300 which closes the front opening part 31 of the grill warehouse 3, and the grill warehouse 3 is provided so that opening is possible by moving the door 300 ahead. In addition, gas burners 23 and 24 are disposed in the front-rear direction in the ceiling portion and the lower areas on both side surfaces in the grill cabinet 3, and an exhaust duct 35 is continuously provided in the back thereof.

  On the back surface of the door 300, a packing material 130 made of heat-resistant rubber or metal is disposed so as to correspond to the entire circumference of the front frame 122 that forms the periphery of the front opening portion 31. When the door is completely closed, the rear surface of the door 300 is in close contact with the front surface of the front frame 122 via the packing material 130.

  Further, a door switch 32 constituted by a micro switch or the like is provided on the lower back side of the front frame 122. Although not shown, the back surface of the door 300 facing the switch portion of the door switch 32 is provided on the back surface of the door 300. An operating portion that presses the switch portion of the door switch 32 in a state where the back surface is in close contact with the front surface of the front frame 122 is provided. When the operating part presses the switch part, it is detected whether or not the front opening part 31 of the grill 3 is closed by the door 300.

Japanese Patent Laid-Open No. 2003-190024

By the way, in the cooking device in which the door 300 for closing the heating chamber is provided on the front surface as described above, the packing material 130 between the back surface of the door 300 and the front frame 122 may be damaged or deteriorated. For this reason, there may be a gap due to a blockage failure between the back surface of the door 300 and the front frame 122, but the switch portion of the door switch 32 is not connected to the door 300 in spite of the gap. If it is pressed by the operating portion protruding from the back surface, the door 300 may be detected to be blocked. As a result, even in the state where the door 300 is incompletely closed, the gas burners 23 and 24 are ignited and the inside of the grill cabinet 3 is heated. There is a risk of leakage to the outside of the grill 3 through the gap formed between the two.
In particular, when considering the incorporation of an oven chamber in which hot air is circulated in the heating chamber using a circulation fan instead of the grill chamber 3 as the heating chamber, the hot air easily leaks to the outside even with a slight gap. Therefore, when the counter top 111 is made of a material such as ABS resin or wood having low heat resistance, the counter top 111 located above the door 300 may be discolored or deformed due to the leaked hot air. There is a problem that the counter top 111 is heated and burns. Even in the case of the counter top 111 made of stainless steel, there is a problem that the protective cover material made of resin that covers the cut surface is damaged by heat. In addition, there is a problem in that the heated air leaks to the outside, causing cooking to be insufficiently heated and uneven baking.

  In view of the above problems, the present invention can reliably and quickly detect leakage of hot air when cooking is performed by closing the front opening of the heating chamber with the door incomplete. An object is to provide a cooking device.

The present invention taken to achieve the above object
A heating chamber for storing the food,
A circulation fan for circulating hot air in the heating chamber ;
A door that freely opens and closes the front opening of the heating chamber;
An exhaust duct for discharging hot air generated in the heating chamber,
A cooking device in which the front opening portion is closed by bringing the back surface of the door and the front frame surface constituting the periphery of the front opening portion into close contact with each other,
In the upper side of the front frame, in the range where the back surface of the door is in close contact and / or above, the ventilation hole is penetrated,
The vent hole communicates with the exhaust duct via a blower passage provided above the heating chamber,
The cooking device according to claim 1, wherein a temperature sensor for detecting an abnormal temperature rise of air flowing in the air passage is installed in the vicinity of the vent hole in the air passage.

When the back surface of the door is in close contact with the front frame, the front open part of the heating chamber is closed, so even if the heating chamber is heated, the internal hot air will not leak to the outside, but the back surface of the door and the front frame If even a slight gap is generated between them, a part of the hot air in the heating chamber leaks upward from the gap. However, according to the heating cooker, a vent hole is formed on the upper side of the front frame, and the vent hole communicates with the exhaust duct for discharging hot air in the heating chamber via the air passage. The leaked hot air rises, a part of which is sucked into the vent hole, passes through the air passage, and is discharged from the exhaust duct. Therefore, by providing a temperature sensor in the air passage, when the hot air leaked from the gap is sucked into the air passage from the vent hole, the temperature sensor is exposed to the hot air. The temperature rise can be detected reliably and quickly.
Furthermore, since the temperature sensor is installed near the vent hole in the air passage, the temperature sensor has excellent responsiveness to high-temperature hot air sucked from the vent hole, and abnormal temperature rise due to leakage of hot air. The temperature can be detected more reliably and quickly.
And since it has the circulation fan which circulates hot air in the said heating chamber, when a clearance gap arises between the back surface of a door and a front frame, although it becomes easy to leak hot air from a heating chamber by a circulation fan, the said heating cooking According to the vessel, it is possible to reliably and quickly detect such hot air leakage.

  In addition, the upper side of the front frame has the ventilation hole above at least a range where the back surface of the door is in close contact, and the ventilation hole has air from the outside in a state where the front opening is closed by the door. Since the vent hole is provided at least above the close contact range of the door, even when the door closes the front opening portion in a normal sealed state, the vent hole is provided. External air is taken into the air passage from the pores. Therefore, the detected temperature detected by the temperature sensor in the normal state and the temperature sensor in the abnormal state in which hot air is sucked into the air passage due to a gap formed between the back surface of the door and the upper side of the front frame. The temperature difference from the detected temperature increases.

  Further, a packing material is disposed between the back surface of the door and the front frame around the front opening of the heating chamber, and air is taken in below the lower side of the packing material. A hole is provided, and the air intake hole is configured such that air is taken in from the outside by rotation of the circulation fan in a state where the front opening is closed by the door, and the packing material and the air intake hole In the front frame between the front and rear of the packing material, a protrusion protruding forward is formed along the lower side of the packing material. If the packing material is damaged or deteriorated, the hot air leaking from the heating chamber due to the rotation of the circulation fan is taken in from the air intake hole, so that the temperature in the heating chamber decreases or the hot air sucked from the vent hole decreases. , There is a possibility that the abnormal Atsushi Nobori detection is delayed. However, by forming a ridge that protrudes forward along the lower side of the packing material of the front frame, leakage of hot air from the front open part of the heating chamber to the bottom is suppressed, so the temperature in the heating chamber can be reduced. While being able to prevent, the temperature sensor provided in the ventilation path can detect the abnormal temperature rise by the leak of hot air at an early stage.

  Further, the temperature gradient of the detected temperature within a predetermined detection time from the start of heating detected by the temperature sensor is based on a reference gradient based on a normal detected temperature detected during normal heating in a state where the door is normally closed. If it is larger, it is determined that the temperature has risen abnormally due to poor closing of the door, and the heating control means for stopping the cooking operation is detected by the temperature sensor within a few minutes after starting the cooking. When the temperature gradient of the temperature exceeds the reference gradient, the cooking operation stops automatically and enters a non-heated state. Leakage can be judged, and thereby leakage of hot air to the outside can be further suppressed.

Furthermore, it has a door switch for detecting the opening and closing of the door,
Even if the door closed state is detected by the door switch, when the abnormal temperature rise is detected by the temperature sensor, the heating control means stops the heating cooking operation. The door switch determines whether or not it is normally closed. For example, even if a slight lack of sealing caused by damage or deformation of the packing material cannot be determined, if a leak of hot air occurs, the temperature sensor Reacts quickly and stops the cooking operation, so that the problem caused by the leakage of hot air from the heating chamber can be solved more reliably. As described above, the door closing failure is double-checked by the door switch and the temperature sensor, so that further excellent reliability can be ensured.

  As described above, according to the present invention, since the leak of hot air from the heating chamber can be reliably and quickly detected by the temperature sensor, if the heating is stopped when the abnormal temperature rise is detected by the temperature sensor, The inconvenience that the counter top made of a material having low heat resistance is discolored or deformed by hot air and the risk of burns can be avoided. In addition, it is possible to prevent inconveniences such as insufficient heating of the cooked food and uneven baking due to leakage of hot air in the heating chamber to the outside.

It is a schematic cross-sectional perspective view which shows the heating cooker in embodiment of this invention. It is a cross-sectional principal part perspective view which shows the back part of the heating cooker in embodiment of this invention. It is a front principal part perspective view which shows the heating cooker in embodiment of this invention, and shows the state which the door opened slightly. It is a flowchart which shows an example of the heat cooking operation by the heat cooker in embodiment of this invention. It is a principal part perspective view which shows the front part of the heating cooker in the 1st modification of embodiment of this invention. It is a cross-sectional principal part perspective view which shows the back part of the heating cooker in the 2nd modification of embodiment of this invention. It is a schematic sectional drawing which shows the structure of the conventional heating cooker.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic longitudinal sectional perspective view of a built-in type gas stove in which a stove body 13 is incorporated in a state of being dropped into an opening 12 of a countertop 11 of a system kitchen as a heating cooker according to an embodiment of the present invention. . This gas stove has an oven cabinet 2 as a heating chamber for storing a cooked food in the stove main body 13 and a combustion chamber 20 below it. In the present specification, the direction in which the door 28 side and the back side of the oven cabinet 2 face each other is referred to as the front-rear direction, the width direction of the oven cabinet 2 is referred to as the left-right direction, and the height direction of the oven cabinet 2 is referred to as the up-down direction.

  The oven cabinet 2 is located below the counter top 11, and includes an upper wall 2a constituting a ceiling portion, a lower wall 2b defining a combustion chamber 20 provided below the oven cabinet 2, left and right side walls 2c, and an oven. It has a rear wall 2d in which a blowout hole 201 and a suction hole 202 for circulating hot air in the cabinet 2 are formed, and a front opening part 21 for taking in and out the food in the center part of the front panel 33 is opened. It is provided as follows.

  An exhaust passage 14 is formed above the ceiling, and the exhaust passage 14 communicates with a discharge hole 16 provided in the upper wall 2a and an exhaust duct 15 provided in the rear upper portion of the stove body 13. doing. Thereby, at the time of cooking, a part of the hot air circulating in the oven chamber 2 is discharged to the outside through the exhaust duct 15 through the exhaust passage 14 from the exhaust hole 16.

  In addition, the left and right central portions where the suction holes 202 of the rear wall 2d are formed bulge forward, and the bulged portion is supplied with hot air from the combustion chamber 20 via the air passage 20a. It is surrounded by a partition plate 17 except for the lower part. The suction hole 202 of the rear wall 2d is formed so as to face the opening 17a of the partition plate 17.

  The combustion chamber 20 disposed below the oven chamber 2 is provided with a gas burner 40 to which fuel gas is supplied via a gas supply pipe (not shown), and air sucked from the front lower portion of the combustion chamber 20. Is heated by the combustion of the gas burner 40, and the generated hot air is sucked into the circulation fan 18 through the air passage 20a.

  As shown in FIGS. 1 and 2, a partition plate 17 having an opening 17a is provided in the left and right center part behind the rear wall 2d of the oven cabinet 2, and a circulation fan 18 is rotatable behind the opening 17a. Has been placed. The rotating shaft of the circulation fan 18 is connected to the shaft of a fan motor M housed in a motor case 199 attached to the rear rear side of the fan cover 19 and is driven by the rotation.

The circulation fan 18 sucks hot air in the oven cabinet 2 from a suction hole 202 provided in the rear wall 2d of the oven cabinet 2, and communicates with an air passage 20a provided below the rear wall 2d and the partition plate 17. Hot air is sucked from the gaps to be circulated, and the hot air is circulated from the outlet passages 180 provided on the left and right of the circulation fan 18 through the blowout holes 201 of the rear wall 2d.
That is, at the time of cooking, the hot air sent from the combustion chamber 20 to the air passage 20a by the circulation fan 18 and the circulating hot air in the oven chamber 2 are mixed and supplied into the oven chamber 2, thereby the oven chamber 2 The temperature in the oven 2 can be rapidly increased, and the temperature in the oven cabinet 2 can be made uniform efficiently.

  A cooling passage 34 that communicates with the outside through a cooling duct 36 is formed between the fan cover 19 and the motor case 199, and a cooling fan 37 that cools the fan motor M circulates in the cooling passage 34. It is provided coaxially with the fan 18. Thereby, the hot air discharged | emitted through the exhaust duct 15 at the time of cooking can be cooled.

  The oven cabinet 2 is configured to be opened and closed by moving the door 28 back and forth, and pulls out the support frame 41, the plate 42 supported by the door 28, and the grill net 4 together with the door 28 during cooking. Then, for example, after placing an object to be cooked such as fish on the grill 4, the object to be cooked can be stored in the oven cabinet 2 by moving the door 28 backward.

  The door 28 is printed on the other portions except for the window 27 so that the transparent window 27 is formed at the center, and the handle 29 is formed in a shape protruding forward at the lower end. The packing in which the back surface of the door 28 is formed in a rectangular frame shape along the rectangular frame portion on the surface of the rectangular front frame 22 that forms the periphery of the front opening portion 21 of the oven cabinet 2. It is set so as to be in close contact via the material 30.

  Although not shown, reed switches are provided as door switches at predetermined positions on the left and right sides of the front frame 22 of the oven cabinet 2, and magnets as operating parts are provided on the left and right lower portions of the corresponding doors 28. Is arranged. Therefore, when the door 28 is closed, the reed switch is actuated by the magnet, and the closing of the door 28 is detected. This door switch closing signal is output to the heating control means 26 described later. The door switch may be provided behind the oven cabinet 2 so as to detect the open / closed state of the door 28 based on the position of the lower frame or the plate 42.

As shown in FIG. 3, the upper side portion of the front frame 22 of the oven cabinet 2 has a plurality of upper and lower central portions that are above the contact area with which the packing material 30 abuts when the door 28 is closed. A vent hole 10 is formed.
As shown in FIG. 1, the air vent 10 communicates with the exhaust duct 15 via the air passage 5 provided at a position adjacent to the exhaust passage 14 in the vertical direction, as shown in FIG. 1. Yes. Thereby, the exhaust passage 14 is cooled by the external air taken in through the vent hole 10 during cooking, and the top plate overheating due to the hot air passing through the exhaust passage 14 can be reduced.

  A flange 38 extending toward the door 28 is formed above the vent 10, and the door 28 is air connected to the vent 10 between the lower surface of the flange 38 and the upper surface of the door 28. The intake portion 39 is arranged to be formed. Thereby, in the abnormal state in which a gap between the back surface of the door 28 and the front frame 22 is generated, the hot air leaked upward temporarily stays in the flange portion 38, so that the hot air sucked from the vent hole 10 can be increased. At the same time, external air easily flows from the front side to the vent hole 10 through the air intake portion 39 in a normal state.

  The temperature sensor 1 is installed near the vent hole 10 in the air passage 5, and the detected temperature detected by the temperature sensor 1 is output to the heating control means 26. That is, when a gap is generated between the back surface of the door 28 and the front frame 22, a part of the hot air in the oven cabinet 2 leaks upward from the gap, but the vent hole 10 discharges the hot air in the oven cabinet 2. Since the air is connected to the air duct 5 connected to the exhaust duct 15, the leaked hot air is sucked into the vent hole 10 by the draft effect by the hot air exhausted from the exhaust duct 15 or the cooling air exhausted from the cooling duct 36. The air is discharged from the exhaust duct 15 through the air passage 5. Thereby, it is possible to suppress leakage of high-temperature hot air to the outside in front of the oven cabinet 2. And since the temperature sensor 1 is provided in the ventilation hole 10 vicinity in the ventilation path 5, the temperature sensor 1 is exposed to the hot hot air suck | inhaled through the ventilation hole 10, and it originates in the leakage of hot air by it. It is possible to reliably and quickly detect an abnormal temperature rise. Therefore, if the cooking operation is controlled based on the abnormal temperature rise detected by the temperature sensor 1, the countertop 11 can be prevented from being overheated by the leaked hot air.

  If the vent hole 10 is located at the upper side of the front frame 22 above the close contact area of the door 28, the door 28 normally closes the front opening. However, external air can be taken in from the vent hole 10. As a result, the detected temperature detected by the temperature sensor 1 in the normal state, and the temperature sensor in the abnormal state in which a gap is generated between the back surface of the door 28 and the upper side of the front frame 22 and hot air is sucked into the air passage 5. The temperature difference from the detected temperature detected at 1 becomes large, and abnormal temperature rise can be detected more quickly. In addition, by forming the vent hole 10 in the shape of a thin groove in the vertical direction, it is difficult for the temperature sensor 1 to be exposed to detergent and water during cleaning, and it is possible to prevent direct contact with the hand. Furthermore, by adopting a configuration in which the vent hole 10 is not provided in the front portion of the temperature sensor 1, the temperature sensor 1 can be more reliably protected from detergent and water.

  The heating control means 26 controls various cooking operations by operating an operation switch or the like provided on the front panel 33, and an abnormality detected by the temperature sensor 1 when cooking is performed in the oven cabinet 2. A function of stopping the cooking operation based on the temperature rise is provided. Specifically, the heating control means 26 starts a storage unit storing a reference gradient based on a normal detection temperature detected during normal heating when the door 28 is normally closed, and a cooking operation is started. A temperature comparison unit that compares the temperature gradient of the detected temperature within a predetermined time from the start temperature at the time and a reference gradient, a combustion control unit that performs combustion control of the gas burner 40 based on the comparison result of the temperature comparison unit, and the like, It is composed of a CPU, ROM, RAM and the like.

Next, the operation control when the cooking operation is performed will be described based on the flowchart shown in FIG.
After the door 28 is pulled forward and a food item such as a fish is placed on the grill 4, the door 28 is pushed backward to close the front opening 21 of the oven cabinet 2. Then, in step 1 (S1), when the power switch is turned on, and further, in step S2 (S2), when the start switch is turned on, cooking by the oven is started. 3 (S3), it is confirmed that the door switch is in the ON state (the door is in the “closed” state). When the door switch is ON, the process proceeds to step 4 (S4), and although not shown, the electromagnetic valve is opened, the gas burner 40 is ignited, and the inside of the oven chamber 2 is heated.

  At the same time, a timer is set according to the various mode switches of the oven that are input simultaneously with the start switch (step 5 (S5)), and the time until the end of baking (setup) is measured. In (S6), the temperature increase speed (temperature gradient) of the temperature detected by the temperature sensor 1 after a predetermined time (3 minutes) has elapsed from the start of heating is measured, and the temperature gradient is equal to or less than a preset reference gradient. In this case, it is regarded as a normal state, and heating by the gas burner 40 is continued.

  When the timer expires in step 7 (S7), the solenoid valve is closed in step 8 (S8), the gas burner 40 is extinguished, and the baking cooking by the oven is completed.

  On the other hand, if it is determined in step 6 (S6) that the temperature gradient of the temperature detected by the temperature sensor 1 after the elapse of a predetermined time (3 minutes) from the start of heating is greater than the reference gradient, As a result, when the heating control means 26 is operated, the electromagnetic valve is forcibly closed in step 8 (S8), and the gas burner 40 is extinguished.

  In this case, although the door switch is ON in step 3 (S3), it is determined in step 6 (S6) that the temperature has risen abnormally, and in step 8 (S8), the gas burner 40 is extinguished. The Rukoto.

  As described above, in step 3 (S3), even when the door switch is ON, that is, the door 28 is in the “closed” state, the abnormal temperature rise of the temperature detected by the temperature sensor 1 is confirmed in step 6. That is, it was confirmed that hot air leaked from the oven cabinet 2.

  As described above, since the temperature sensor 1 disposed in the air passage 5 detects an abnormal temperature rise due to the hot air leaking from the gap between the door 28 and the front opening 21, it is responsive to the leaked hot air. And can quickly respond to the leakage of hot air.

  Further, if the leakage of hot air from the door 28 is confirmed, the gas burner is forcibly extinguished, so that it is possible to prevent inconvenience that the countertop 11 above the door 28 is overheated by the leaked heat. . Therefore, even when the counter top 11 is formed of a material having low heat resistance, there is a disadvantage that the counter top 11 is discolored or deformed by heat leaking from the door 28, or the heated counter top 11 may be burned when touched. Can also be avoided.

  In addition, there is no inconvenience that the cooking object is insufficiently heated and uneven baking is caused by continuing the cooking operation while the hot air in the oven chamber 2 is leaked.

  Furthermore, the door 28 is detected as being closed by the door switch, but even if the door switch detects “closed”, the packing material 30 may be damaged or deformed between the door 28 and the front frame 22. There may be a slight gap. In such a very small gap, the door switch does not react and the “closed” state is maintained. However, according to the cooking device, even if it is determined that the door is “closed” by the door switch, if the abnormal temperature rise is detected by the temperature sensor 1, the gas burner 40 is forcibly given priority over the door switch. The fire is extinguished. Therefore, for example, when a slight lack of sealing performance caused by damage or deformation of the packing material 30 that cannot be detected by the door switch occurs, the temperature sensor 1 reacts promptly when a leak of hot air occurs from the lack, Since the cooking operation is stopped, the problem caused by the leakage of hot air from the heating chamber can be solved more reliably.

  FIG. 5 is a perspective view showing a main part of the front portion of the cooking device according to the first modification of the present embodiment. In addition, in order to avoid complication, other components, such as the door 28 and the collar part 38, are abbreviate | omitted in the figure. As shown in FIG. 5, this cooking device has a packing material 30 disposed on a front frame 22 around a substantially rectangular front opening portion 21 of the oven cabinet 2, and below the packing material 30, A ridge 22 a is formed along the lower side of the packing material 30 by protruding the front frame 22 forward at substantially the same height as the protruding height of the packing material 30.

  As described above, the air intake hole 80 for taking in air from the outside into the combustion chamber 20 in order to circulate hot air in the oven chamber 2 is formed below the front opening portion 21 of the oven chamber 2. For this reason, when the packing material 30 is damaged or deteriorated, hot air leaked from the oven cabinet 2 due to rotation of the circulation fan 18 may be sucked into the combustion chamber 20 from the air intake hole 80. As a result, the temperature in the oven cabinet 2 may decrease, or the hot air sucked from the vent hole 10 provided above the front frame 22 of the oven cabinet 2 may be reduced, and detection of abnormal temperature rise may be delayed. However, by forming the ridge 22a that protrudes forward along the lower side of the packing material 30 of the front frame 22, even when the circulation fan 18 is rotated, the front opening portion 21 of the oven cabinet 2 is lowered downward. The leaking hot air can be suppressed, the temperature drop in the oven chamber 2 can be prevented, and the abnormal temperature rise due to the hot air leakage can be detected earlier by the temperature sensor 1 provided in the air blowing path 5. In the present embodiment, the air intake hole 80 is provided in the front wall of the combustion chamber 20 located below the front opening portion 21 of the oven chamber 2 and one step behind the front frame 22. As long as it is located below the location where the packing material 30 is disposed and where air is not taken into the oven cabinet 2 when the door 28 is closed, it may be provided on the front frame 22 itself, It may be provided on the bottom wall.

  FIG. 6 is a cross-sectional main part perspective view showing a rear portion of the heating cooker in the second modification of the present embodiment. In the above embodiment, the gas burner 40 is used as a heating means. However, in this heating cooker, the gas burner 40 is not disposed below the oven cabinet 2, and as shown in the drawing, the rear of the blowout hole 201 is provided. An electric heater 48 is disposed in the outlet passage 180. As such an electric heater 48, a sheathed heater capable of generating high-temperature hot air can be used. Note that the lower part of the oven chamber 2 is not shown because it has the same configuration as that of the combustion chamber 20 of the heating cooker in the above embodiment except that the gas burner 40 is not provided. It functions as a ventilation chamber for taking in external air. Therefore, in this heating cooker, when oven cooking is performed, rotation of the circulation fan 18 and the cooling fan 37 is started, and when energization of the electric heater 48 is started, hot air is generated in the outlet passage 180. To do. And by the air introduce | transduced from the ventilation chamber below the oven chamber 2, the hot air which generate | occur | produced in the exit channel | path 180 is sent out as hot air in the oven chamber 2 from the blowing hole 201, and the hot air in the oven chamber 2 is The air is sucked into the outlet passage 180 through the suction hole 202 formed in the rear wall 2d. Thereby, a hot air can be circulated in the oven cabinet 2, and oven cooking can be performed.

  In the above embodiment, the heating cooker having the oven cabinet 2 with the circulation fan 18 as the heating chamber has been described. However, the present invention may be applied to a heating cooker having a grill cabinet without the circulation fan. .

  Moreover, in the said embodiment, although abnormal temperature rise is judged from the temperature gradient, when the detected temperature of the temperature sensor 1 turns into predetermined temperature, you may detect as abnormal temperature rise. Furthermore, although the difference between the temperature gradient of the temperature detected by the temperature sensor 1 and the reference gradient is small, even if the vent hole 10 is formed only in the area where the back surface of the door 28 is in close contact with the upper side of the front frame 22. good.

  In the above-described embodiment, the door switch and the temperature sensor 1 can double check whether the door 28 is closed, but the door switch is not necessarily provided.

1 Temperature Sensor 10 Vent 15 Exhaust Duct 2 Heating Chamber (Oven)
21 front opening part 22 front frame 22a ridge 28 door 5 air passage

Claims (5)

A heating chamber for storing the food,
A circulation fan for circulating hot air in the heating chamber ;
A door that freely opens and closes the front opening of the heating chamber;
An exhaust duct for discharging hot air generated in the heating chamber,
A cooking device in which the front opening portion is closed by bringing the back surface of the door and the front frame surface constituting the periphery of the front opening portion into close contact with each other,
In the upper side of the front frame, in the range where the back surface of the door is in close contact and / or above, the ventilation hole is penetrated,
The vent hole communicates with the exhaust duct via a blower passage provided above the heating chamber,
A heating cooker characterized in that a temperature sensor for detecting an abnormal temperature rise of air flowing in the air passage is installed in the vicinity of the vent hole in the air passage. The heating cooker according to claim 1, wherein
The upper side portion of the front frame has the air hole above at least a range where the rear surface of the door is in close contact, and the air hole takes in air from the outside in a state where the front opening portion is closed by the door. It is comprised so that it may be heated. The heating cooker according to claim 1 or 2 ,
A packing material is disposed between the rear surface of the door and the front frame around the front opening of the heating chamber,
An air intake hole is provided below the lower side of the packing material, and the air intake hole is air from outside by rotation of the circulation fan in a state where the front opening is closed by the door. Is configured to be captured,
A heating cooker characterized in that a ridge protruding forward along the lower side of the packing material is formed in the front frame between the packing material and the air intake hole. The cooking device according to any one of claims 1 to 3 , further comprising:
When the temperature gradient of the detected temperature within a predetermined detection time from the start of heating detected by the temperature sensor is greater than the reference gradient based on the normal detected temperature detected during normal heating with the door normally closed The heating cooker is characterized by having a heating control means for determining that the temperature rises abnormally due to poor closing of the door and stopping the cooking operation. The cooking device according to claim 4 , further comprising:
Having a door switch for detecting the opening and closing of the door;
Even if the door closed state is detected by the door switch, the heating control means stops the cooking operation when an abnormal temperature rise is detected by the temperature sensor.

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