JP2012127579A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heating cooker which can determine whether a tray needs to be cleaned or not.SOLUTION: The heating cooker includes: a heating chamber 1 provided on a body; a heater for heating an object to be heated 4 provided on the heating chamber 1; a tray 6 on which the object to be heated 4 is put and arranged detachably in the heating chamber 1; a tray detecting means 100 for detecting the presence or absence of the tray 6; and a control means 200 for determining whether the tray 6 needs to be cleaned or not based on a heating operation of the heater and a detected result of the tray detecting means 100. The tray detecting means 100 having a magnetic flux generating means 110 for generating magnetic flux detects the presence or absence of the tray 6 by changing the magnetic flux.

Description

  The present invention relates to a heating cooker.

  In a conventional cooking device, for example, “controlling the heating means for heating the food stored in the heating chamber, a tray for placing the food, a door body for opening and closing the opening of the heating chamber, and the heating means. In addition, when a cleaning operation is selected by the menu selection means, a control means for maintaining the heating chamber at a high temperature to burn off dirt, a temperature detection means for detecting the temperature of the heating chamber, and a temperature detection means When the differential value of the detected temperature is greater than or equal to a predetermined value, it is determined that the tray is not stored in the heating chamber, and when the differential value is less than the predetermined value, the tray is stored in the heating chamber. A tray discriminating means for discriminating that there is a tray, and the control means, when the tray discriminating means discriminates that the tray is present when the cleaning operation is selected, Configuration and the "which informs that the pan is housed in the heating chamber by sound generating device has been proposed (e.g., see Patent Document 1).

Japanese Patent No. 4207014 (Claim 1)

In a heating cooker, a saucer is provided for receiving oil, scraps, and the like dripping from a heated object such as food. If cooking is performed in a state where oil or debris is accumulated in the tray, smoke or fire may occur due to heat during cooking.
For this reason, the cooking device which can judge whether the saucer was wash | cleaned by the user was desired.

In Patent Document 1, it is determined whether or not the tray is housed in the heating chamber based on the differential value of the temperature detected by the temperature detection means during the cleaning operation.
However, since the differential value of the detected temperature is used, there are problems that the judgment algorithm is complicated and the detection accuracy is low.

On the other hand, an optical sensor can be considered for detecting the presence or absence of a tray.
However, since the tray to be detected is placed in the heating chamber, the optical sensor cannot obtain sufficient reliability against contamination from oil, smoke, etc. from food, etc., or heat from cooking. There was a problem.

The present invention has been made in order to solve the above-described problems, and provides a cooking device capable of determining whether or not a tray is washed.
Moreover, the cooking device which can improve the detection accuracy which detects the presence or absence of a saucer is obtained.
Moreover, the heating cooker which can improve the reliability of detection of the presence or absence of a saucer with respect to the contamination and heat in a heating chamber is obtained.

  A heating cooker according to the present invention is provided with a heating chamber provided in a main body, a heating means provided in the heating chamber for heating an object to be heated, and detachably disposed in the heating chamber, wherein the object to be heated is A receiving tray placed thereon, a receiving tray detecting means for detecting the presence or absence of the receiving tray, and a control means for determining whether or not the receiving tray is cleaned based on the heating operation of the heating means and the detection result of the receiving tray detection means. The receiving tray detecting means includes magnetic flux generating means for generating a magnetic flux, and detects the presence or absence of the receiving tray based on a change in the magnetic flux.

In the present invention, it is possible to determine whether or not the tray is washed.
Moreover, the detection accuracy which detects the presence or absence of a saucer can be improved.
Moreover, the reliability of detection of the presence or absence of a saucer can be improved with respect to the contamination and heat in a heating chamber.

1 is a perspective view of a heating cooker according to Embodiment 1. FIG. It is a sectional side view of the heating cooker which concerns on Embodiment 1. FIG. 2 is a main block diagram of a control circuit according to Embodiment 1. FIG. It is a figure which shows typically the structure of the saucer detection means 100 which concerns on Embodiment 1. FIG. It is a figure which shows the detection operation | movement of the saucer detection means 100 which concerns on Embodiment 1. FIG. FIG. 6 is a diagram for explaining an arrangement position of a magnetic core 112 according to the first embodiment. It is a figure explaining the arrangement position of the saucer detection means 100 which concerns on Embodiment 1. FIG. It is a figure which shows the heating operation of the heater which concerns on Embodiment 1, and the detection result of the saucer detection means. 4 is a flowchart of an operation for determining whether or not the tray 6 according to Embodiment 1 is cleaned. 6 is a flowchart showing a heating prohibition / notification operation according to the second embodiment. 10 is a flowchart showing a heating prohibition / notification operation according to the third embodiment. 6 is a flowchart showing a heating prohibition / notification operation according to Embodiment 4; It is a figure which shows typically the structure of the saucer detection means 100 which concerns on Embodiment 5. FIG. It is a figure which shows typically the structure of the saucer detection means 100 which concerns on Embodiment 6. FIG. It is a figure which shows typically the structure of the saucer detection means 100 which concerns on Embodiment 7. FIG. It is a figure explaining the phase difference of the magnetic flux of the magnetic circuit which concerns on Embodiment 7. FIG. It is a figure which shows the alternating current supplied to the exciting coil 111 which concerns on Embodiment 8. FIG.

Embodiment 1 FIG.
1 is a perspective view of a heating cooker according to Embodiment 1. FIG.
FIG. 2 is a side sectional view of the heating cooker according to the first embodiment.
As shown in the figure, the cooking device in the first embodiment is provided with a top plate 24 on the upper surface of the main body 20.
In addition, a heating chamber 1 whose front surface is open so that an object to be heated 4 such as fish and meat can be taken in and out is provided at the lower center of the main body 20.
The heating cooker according to the first embodiment performs induction heating on a pan (not shown) placed on the top plate 24 and performs various cooking such as stew cooking, and the heating chamber 1 An object to be heated, such as fish, is placed on the top, and roaster cooking is performed by baking with a heater described later.
In addition, although this Embodiment 1 demonstrates the induction heating cooking appliance with a roaster as a heating cooker, this invention is not restricted to this, For example, to-be-heated material is heated with heating bodies, such as an electrical resistor. Alternatively, the object to be heated may be heated using gas as a heat source.

A drawer-type door 2 that opens and closes the heating chamber 1 is provided on the front side of the heating chamber 1.
The door 2 is provided with 3, and the object 2 can be taken in and out of the heating chamber 1 by holding the door 3 and opening and closing the door 2.

An exhaust port 13 is provided on the rear side of the main body 20.
The exhaust port 13 is provided with an exhaust port cover 14 in which a plurality of communication holes are formed.
When an object to be heated such as a fish placed in the heating chamber 1 is baked by a heater described later, smoke or the like is generated according to the baking state. The air in the heating chamber 1 mixed with the smoke passes through the exhaust duct 50 and is discharged from the exhaust port 13 provided behind the main body 20.

An operation / display panel 23 is provided on the upper front side of the main body 20. The operation / display panel 23 serves as both setting input means for performing a cooking setting operation and notification means by display and sound.
Note that the “operation / display panel 23” in the present embodiment corresponds to “notification means” in the present invention.

Under the top plate 24, an induction heating coil 21 for performing induction heating and a radial heater 26 as a heat source by radiation heating are installed.
Both are heat sources for cooking foods and the like by heating pans, pans, and the like placed on the top plate 24.

The induction heating coil 21 and the radiant heater 26 are set on the middle plane plate 18 based on the middle plane plate 18.
The middle plane plate 18 is a plate for partitioning the upper portion and the lower portion of the main body 20.
In addition, the heating chamber 1 is disposed under the middle plane plate 18, and also serves as a heat shield for preventing leakage heat from the heating chamber 1 from being directly transmitted to the upper induction heating coil 21 and the like. .

In the heating chamber 1, an upper heater 9 and a lower heater 8 are installed as heating sources.
The upper heater 9 and the lower heater 8 are, for example, sheathed heaters, and heat the article to be heated 4 placed in the heating chamber 1.

The “upper heater 9” and “lower heater 8” in the present embodiment correspond to “heating means” in the present invention.
In the following description, when “upper heater 9” and “lower heater 8” are not distinguished, they are simply referred to as “heater”.

A tray 6 is detachably disposed in the heating chamber 1 below the lower heater 8.
A grill net 7 is installed on the tray 6. The article to be heated 4 is placed on the grill 7 and fired by the upper heater 9 and the lower heater 8.
The tray 6 is formed of, for example, a magnetic material, and receives oil and waste dripping from the article to be heated 4 during firing.

Moreover, the guide rail 10 connected to the door 2 and supporting the tray 6 so that it can be pulled out of the heating chamber 1 within a predetermined range is provided on both side surfaces of the heating chamber 1.
The tray 6 is installed on the guide rail 10, and when the user pulls out the door 2, the tray 6 and the grill 7 are pulled out of the heating chamber 1. Thereby, it becomes easy for the user to take out the article 4 to be heated.
In addition, a tray detection means 100 for detecting the presence or absence of the tray 6 is installed below the tray 6. Details will be described later.

  An exhaust duct 50 for exhausting the air in the heating chamber 1 is provided on the rear side of the heating chamber 1. The exhaust from the exhaust duct 50 is discharged out of the main body 20 through the exhaust port 13 described above.

FIG. 3 is a main block diagram of the control circuit according to the first embodiment.
In FIG. 3, the tray detection unit 100 includes a magnetic flux generation unit 110 that generates a magnetic flux, a magnetic circuit 120 that includes at least a part of the tray 6, and a magnetic flux detection unit 130 that detects a change in the magnetic flux.
The control means 200 determines whether or not the tray 6 is cleaned based on the heating operation of the heater and the detection result of the tray detection means 100.
Further, the control means 200 controls the heating operation of the heater based on the determination result of whether or not the tray 6 is cleaned, and displays predetermined information on the operation / display panel 23.
Next, a specific configuration example of the tray detection unit 100 will be described.

FIG. 4 is a diagram schematically showing the configuration of the tray detector 100 according to the first embodiment.
FIG. 4A is a diagram showing a state where the tray 6 is present, and FIG. 4B is a diagram illustrating a state where the tray 6 is not present.
As shown in FIG. 4, the tray detector 100 includes an exciting coil 111 that constitutes a magnetic flux generator 110, a magnetic core 112 around which the exciting coil 111 is wound, and an AC signal 113 that supplies an alternating current to the exciting coil 111. Current detecting means 131 constituting the magnetic flux detecting means 130.
The magnetic core 112 is formed with a substantially U-shaped cross section by a ferromagnetic material, for example. The magnetic core 112 is arranged so that the U-shaped open side faces the tray 6 when the tray 6 is present.
With such a configuration, an annular magnetic circuit 120 is formed by a part of the tray 6 and the magnetic core 112 in a state where the tray 6 is present as shown in FIG.
Further, in the state where there is no tray 6 as shown in FIG. 4B, the magnetic circuit 120 is formed with a space between the end portions of the magnetic core 112.
The “excitation coil 111” in the present embodiment corresponds to the “coil” in the present invention.

FIG. 5 is a diagram illustrating a detection operation of the tray detection unit 100 according to the first embodiment.
In FIG. 5, in the state where the tray 6 is present, an annular magnetic circuit 120 is formed by a part of the tray 6 and the magnetic core 112, so that the inductance of the magnetic path increases. As a result, the current flowing through the exciting coil 111 supplied from the AC signal 113 is reduced.
On the other hand, in the state where there is no tray 6, the magnetic circuit 120 is formed across the space between the end portions of the magnetic core 112, so the inductance of the magnetic path is reduced. As a result, the current flowing through the exciting coil 111 supplied from the AC signal 113 increases.
For this reason, the tray detector 100 detects the presence or absence of the tray 6 based on whether or not the current flowing through the excitation coil 111 detected by the current detector 131 exceeds a predetermined criterion value.

FIG. 6 is a diagram for explaining the arrangement position of the magnetic core 112 according to the first embodiment.
In FIG. 6, the distance between both ends of the magnetic core 112 on the open side of the U-shape is L1, and the distance between the open end of the magnetic core 112 and the tray 6 in the state where the tray 6 is present is L2. Then, the magnetic core 112 is arrange | positioned so that it may become L1> L2.
That is, in a state where the tray 6 is present, the distance (L2) between the U-shaped open side end of the magnetic core 112 and the tray 6 is the distance between the U-shaped open side ends of the magnetic core 112 (L1). It is placed closer.
With such an arrangement, the inductance of the magnetic path due to the presence / absence of the tray 6 changes greatly, and the detection accuracy of the presence / absence of the tray 6 can be improved.

FIG. 7 is a view for explaining the arrangement position of the tray detector 100 according to the first embodiment.
FIG. 7A is a view showing a state in which the door 2 is closed. FIG. 7B is a view showing a state in which the door 2 is opened and the tray 6 is pulled out to the maximum. FIG.7 (c) is a figure which shows the state which removed the saucer 6. FIG.
As shown in FIG. 7A, the saucer detection means 100 is disposed at a position where the saucer 6 is disposed upward in a state where the door 2 is closed.
Further, as shown in FIG. 7B, the tray detection means 100 is disposed at a position where the tray 6 is disposed upward even when the tray 6 is pulled out to the maximum by the guide rail 10.
Thereby, even if the tray 6 is pulled out to the maximum in order to take out the article 4 to be heated, it can be determined that the tray 6 is present.
On the other hand, as shown in FIG. 7C, in the state where the tray 6 is removed, the tray 6 is not disposed above the tray detection means 100, and therefore the state where there is no tray 6 is determined by the above-described operation. It becomes possible.

  Note that the position of the tray detection means 100 is not limited to this. For example, you may arrange | position so that the receiving tray 6 may be opposed to the side surface of the heating chamber 1. FIG.

  In the present embodiment, the case where the tray 6 is formed of a magnetic material will be described, but the present invention is not limited to this. For example, the tray 6 may be formed of a nonmagnetic material such as aluminum. In this case, for example, by setting the alternating current supplied to the exciting coil 111 to a high frequency, it is possible to detect the presence / absence of the tray 6 based on a current change according to the inductance of the magnetic path as described above.

  In addition, the structure of the saucer detection means 100 is not restricted to the structure mentioned above. For example, a permanent magnet may be used as the magnetic flux generation means 110, and a Hall element or the like may be used as the magnetic flux detection means 130.

  Next, the operation | movement which judges the presence or absence of washing | cleaning of the saucer 6 in this Embodiment is demonstrated.

FIG. 8 is a diagram showing the heating operation of the heater and the detection result of the tray detector 100 according to the first embodiment.
FIG. 9 is a flowchart of an operation for determining whether or not the tray 6 according to the first embodiment is cleaned.
Hereinafter, based on each step of FIG. 9, it demonstrates, referring FIG.

(S101)
The control means 200 determines whether or not the heating by the heater is in a stopped state (cooking off).
When the heating by the heater is in the operating state (cooking on), step S101 is repeated.

(S102)
When heating by the heater is in a stopped state, the control unit 200 determines whether or not the tray detection unit 100 has detected a state where the tray 6 is not present.
If the tray 6 is present, the process proceeds to step S105.

(S103)
On the other hand, when there is no tray 6, the control means 200 determines whether or not a predetermined time has elapsed.
If the predetermined time has not elapsed, the process proceeds to step S105.
Here, as the predetermined time, for example, a time assumed when the user removes the tray 6 and performs cleaning is set. Accordingly, it is possible to determine the presence or absence of cleaning by detecting the presence or absence of the tray 6.
Note that the predetermined time information may be set from the operation / display panel 23, for example.

(S104)
In step S103, when the predetermined time or more has elapsed, that is, when the heating by the heater is stopped and the state where there is no tray 6 continues for a predetermined time or more, the control means 200 determines that the tray 6 has been washed. Then, the process returns to step S101 and the above steps are repeated.

(S105)
If the tray 6 is present in step S102 or if the predetermined time or more has not elapsed in step S103, the control means 200 determines that the tray 6 has not been washed, and returns to step S101 to perform the above steps. repeat.

By such an operation, for example, as shown in FIG. 8A, if the state where there is no tray 6 is not detected regardless of the operation of the heater, it is determined that the tray 6 is not washed.
Further, for example, as shown in FIG. 8B, when the state where there is no tray 6 is detected for a time t1 (t1 <predetermined time) while the heating by the heater is stopped, the tray 6 is not washed. to decide. Thereby, for example, in the case of short-time removal such that cleaning is not performed, it is possible to determine that the tray 6 is not cleaned.
On the other hand, for example, as shown in FIG. 8 (c), when the state where there is no tray 6 is detected during time t2 (t2 ≧ predetermined time) while heating by the heater is stopped, it is determined that the tray 6 has been washed. . Thereby, when it is assumed that the user removed the tray 6 and performed cleaning, it is possible to determine that the tray 6 has been cleaned.

When the tray 6 is not washed by the above-described operation, the control unit 200 may not start heating by the heater thereafter.
If it is not determined that the tray 6 has been cleaned, the control means 200 may notify the operation / display panel 23 of information indicating that the tray 6 is to be cleaned.
Information that prompts this cleaning is, for example, information such as “Please remove food residue, oil, etc. adhering to the tray. If you continue heating with food residue attached, it may carbonize and emit smoke.” There is.

As described above, in the present embodiment, the presence / absence of the tray 6 is detected by the tray detection means 100, and the presence / absence of cleaning of the tray 6 is determined based on the heating operation of the heater and the detection result of the tray detection means 100.
For this reason, the presence or absence of washing | cleaning of the saucer 6 can be judged.
In addition, the tray detection unit 100 includes a magnetic flux generation unit 110 that generates a magnetic flux, and detects the presence or absence of the tray 6 based on a change in the magnetic flux.
For this reason, it is not necessary to perform an operation or the like when detecting the presence or absence of the tray 6, and the determination algorithm can be simplified.
Moreover, the detection accuracy which detects the presence or absence of the saucer 6 can be improved.

In the present embodiment, an alternating current is supplied to the exciting coil 111, and in a state where the receiving tray 6 is present, an annular magnetic circuit 120 is formed by at least a part of the receiving tray 6 and the magnetic core 112, and the exciting coil Based on the current flowing through 111, the presence or absence of the tray 6 is detected.
For this reason, even if the saucer 6 and the saucer detection means 100 are contaminated with oil or smoke, the presence or absence of the saucer 6 can be detected. Moreover, since the magnetic core 112 and the excitation coil 111 which comprise the saucer detection means 100 are comparatively heat-resistant, even if it arrange | positions in the heating chamber 1 used as high temperature, reliability does not fall. Therefore, it is possible to improve the reliability of detection of the presence / absence of the tray 6 against contamination and heat in the heating chamber 1.

Further, in the present embodiment, the magnetic core 112 is formed in a substantially U-shaped cross section, and is arranged so that the open side of the U-shape faces the tray 6 when the tray 6 is present.
For this reason, depending on the presence / absence of the saucer 6, a magnetic circuit 120 including the saucer 6 in part and a magnetic circuit 120 spaced apart from each other are formed, and the inductance of the magnetic path of the magnetic circuit 120 changes greatly. It is possible to detect the presence / absence of accuracy.

In the present embodiment, the distance (L2) between the U-shaped open end of the magnetic core 112 and the receiving tray 6 in the state where the receiving tray 6 is present is the both ends of the U-opening side of the magnetic core 112. It is arranged closer than the distance (L1) between the parts.
For this reason, the inductance of the magnetic path by the presence or absence of the saucer 6 will change a lot, and the detection accuracy of the presence or absence of the saucer 6 can be improved.

Moreover, in this Embodiment, the door 2 which opens and closes the opening of the heating chamber 1, and the guide rail 10 which is connected to the door 2 and supports the tray 6 so that it can be pulled out of the heating chamber 1 within a predetermined range are provided. Yes. And the saucer detection means 100 detects the state with the saucer 6 in the state which pulled out the saucer 6 in the predetermined range.
For this reason, even when the door 2 is pulled out to the maximum to take out the article 4 to be heated, it can be determined that the tray 6 is present, and the presence / absence of the tray 6 can be correctly determined.

Further, in the present embodiment, when the heating by the heater is stopped and the state where there is no tray 6 continues for a predetermined time or more, it is determined that the tray 6 has been washed.
For this reason, the presence or absence of washing of the saucer 6 can be determined by detecting the presence or absence of the saucer 6.
In addition, a means for directly detecting oil, debris and the like accumulated in the tray 6 is not necessary, and the configuration can be simplified.

Moreover, in this Embodiment, when it is not judged that the saucer 6 was wash | cleaned, the heating by a heater is not started.
For this reason, when there is a high possibility that oil or debris from the article to be heated 4 has accumulated in the tray 6, it can be prevented from being heated.
Therefore, it is possible to prevent smoke or ignition from oil or debris collected in the tray 6.

In the present embodiment, when it is not determined that the tray 6 has been washed, the operation / display panel 23 notifies the user that the tray 6 is to be washed.
For this reason, when there is a high possibility that oil or debris from the object to be heated 4 has accumulated in the tray 6, the user can be prompted to clean the tray 6.
Therefore, it is possible to prevent smoke or ignition from oil or debris collected in the tray 6.

Embodiment 2. FIG.
In the present embodiment, a mode in which the heating operation is prohibited or notified when the number of times of cooking in a state where the tray 6 is not washed becomes equal to or more than a predetermined number will be described.
The configuration of the present embodiment is the same as that of the first embodiment, and the same reference numerals are given to the same parts.
Moreover, the operation | movement which judges the presence or absence of washing | cleaning of the saucer 6 is the same as that of the said Embodiment 1 (FIG. 9).

FIG. 10 is a flowchart showing the heating prohibition / notification operation according to the second embodiment.
Hereinafter, a description will be given based on each step of FIG.

(S201)
The control means 200 determines whether the heating by the heater has been stopped, and waits until the heating is stopped.

(S202)
When the heating by the heater is stopped (transition from cooking on to cooking off), the control means 200 increments the counter value n.

(S203)
Next, the control means 200 determines whether or not the counter value n is a predetermined number of times or more.
When it is less than the predetermined number of times, the process returns to step S201 and the above steps are repeated.
On the other hand, if the number of times is equal to or greater than the predetermined number, that is, if the number of times of heating by the heater is equal to or greater than the predetermined number, the process proceeds to step S204.
Here, as the predetermined number of times, for example, the number of times of cooking that requires cleaning of the tray 6 in general cooking is set.
The predetermined number of information may be set from the operation / display panel 23, for example.

(S204)
The control means 200 determines whether or not the tray 6 is cleaned by the same operation as in the first embodiment.

(S205)
If it is determined in step S204 that cleaning has been performed, the control unit 200 sets the counter value n to zero (reset), returns to step S201, and repeats the above steps.

(S206)
On the other hand, when it is determined in step S204 that it has not been cleaned, the control unit 200 does not start heating by the heater thereafter (heating prohibition).

(S207)
The control means 200 notifies the operation / display panel 23 of information indicating that the receiving tray 6 is to be cleaned.

As described above, in the present embodiment, the number of times of heating by the heater is counted, and when the number of times is equal to or greater than the predetermined number and it is not determined that the tray 6 has been washed, heating by the heater is not started. .
For this reason, when there is a high possibility that oil or debris from the article to be heated 4 has accumulated in the tray 6, it can be prevented from being heated.
Moreover, when the number of times of cooking (the number of times of heating) is less than the predetermined number of times, heating can be performed and usability can be improved.

In the present embodiment, the number of times of heating by the heater is counted, and when the number is equal to or greater than the predetermined number and it is not determined that the tray 6 has been cleaned, information that prompts the tray 6 to be cleaned Is notified by the operation / display panel 23.
For this reason, when there is a high possibility that oil or debris from the object to be heated 4 has accumulated in the tray 6, the user can be prompted to clean the tray 6. Therefore, it is possible to prevent smoke or ignition from oil or debris collected in the tray 6.

Embodiment 3 FIG.
In the present embodiment, a mode in which the heating operation is prohibited or notified when the accumulated cooking time in a state in which the tray 6 is not washed becomes a predetermined time or longer will be described.
The configuration of the present embodiment is the same as that of the first embodiment, and the same reference numerals are given to the same parts.
Moreover, the operation | movement which judges the presence or absence of washing | cleaning of the saucer 6 is the same as that of the said Embodiment 1 (FIG. 9).

FIG. 11 is a flowchart showing the heating prohibition / notification operation according to the third embodiment.
Hereinafter, a description will be given based on each step of FIG.

(S301)
The control means 200 determines whether or not the heating by the heater is in an on state, and when the heating is in an off state, repeats step S301.

(S302)
When the heating by the heater is in the on state, the control unit 200 adds up the heating time t.

(S303)
Next, the control means 200 determines whether or not the heating time t is equal to or longer than a predetermined integration time.
If it is less than the predetermined integration time, the process returns to step S301 and the above steps are repeated.
On the other hand, when it is more than the predetermined integration time, the process proceeds to step S304.
Here, as the predetermined integrated time, for example, a total value of cooking time that requires washing of the tray 6 in general cooking is set.
Note that the information of the predetermined integration time may be set from the operation / display panel 23, for example.

(S304)
The control means 200 determines whether or not the tray 6 is cleaned by the same operation as in the first embodiment.

(S305)
If it is determined in step S304 that the cleaning has been performed, the control unit 200 sets the heating time t to zero (reset), returns to step S301, and repeats the above steps.

(S306)
On the other hand, when it is determined in step S304 that it has not been cleaned, the control unit 200 does not start heating by the heater thereafter (heating prohibition).

(S307)
The control means 200 notifies the operation / display panel 23 of information indicating that the receiving tray 6 is to be cleaned.

As described above, in this embodiment, the heating time by the heater is integrated, and when the integrated time is equal to or longer than the predetermined time and it is not determined that the tray 6 has been washed, heating by the heater is started. do not do.
For this reason, when there is a high possibility that oil or debris from the article to be heated 4 has accumulated in the tray 6, it can be prevented from being heated.
Moreover, when the number of times of cooking (the number of times of heating) is less than the predetermined number of times, heating can be performed and usability can be improved.

Further, in the present embodiment, the heating time by the heater is integrated, and when the integrated time is equal to or longer than the predetermined time and it is not determined that the tray 6 has been cleaned, the cleaning of the tray 6 is urged. Is notified by the operation / display panel 23.
For this reason, when there is a high possibility that oil or debris from the object to be heated 4 has accumulated in the tray 6, the user can be prompted to clean the tray 6. Therefore, it is possible to prevent smoke or ignition from oil or debris collected in the tray 6.

Embodiment 4 FIG.
In the present embodiment, a description will be given of a mode in which the heating operation is prohibited or notified on the assumption that heating of the heater without the tray 6 is misuse.
The configuration of the present embodiment is the same as that of the first embodiment, and the same reference numerals are given to the same parts.
Moreover, the operation | movement which judges the presence or absence of washing | cleaning of the saucer 6 is the same as that of the said Embodiment 1 (FIG. 9).

FIG. 12 is a flowchart showing the heating prohibition / notification operation according to the fourth embodiment.
Hereinafter, description will be given based on each step of FIG.

(S401)
The control means 200 determines from the operation / display panel 23 whether or not a heating start operation is performed by the heater, and waits until the heating start operation is performed.

(S402)
The user operates the operation / display panel 23 to start heating by the heater in the heating chamber 1.
The control unit 200 determines whether or not the tray detection unit 100 has detected a state where the tray 6 is present.

(S403)
When there is no tray 6, the control unit 200 disables the operation and does not start heating by the heater (heating prohibited).

(S404)
The control means 200 notifies the operation / display panel 23 of information indicating that it is misused, returns to step S402, and repeats the above steps.
As information indicating this misuse, for example, there is information such as “Please install a saucer. Heating is not possible without a saucer”.

(S405)
On the other hand, if the tray 6 is present in step S <b> 402, the control unit 200 starts heating the heater based on the operation from the operation / display panel 23.

As described above, in the present embodiment, when the tray 6 is not present, heating by the heater is not performed.
For this reason, the misuse which a heater is heated in the state without the saucer 6 can be prevented.

In the present embodiment, when there is no tray 6, the operation / display panel 23 notifies the information indicating that the tray 6 is misused.
For this reason, in the case of misuse, it can urge the user to install the tray 6.

Embodiment 5 FIG.
In the first embodiment, the case where the magnetic core 112 formed in a U shape is used has been described. In the present embodiment, an embodiment using a magnetic core 112 formed concentrically will be described.

FIG. 13 is a diagram schematically showing the configuration of the tray detector 100 according to the fifth embodiment.
FIG. 13A shows a front sectional view, and FIG. 13B shows a side sectional view. FIG. 13C is a diagram for explaining the arrangement position of the magnetic core 112.
As shown in the figure, the magnetic core 112 in the present embodiment is formed in a rod shape, a central core 112a around which an exciting coil 111 is wound, and an outer periphery formed in a cylindrical shape and arranged concentrically with the central core 112a. And a core 112b.
The central core 112a is formed in a cylindrical shape, for example.
The outer peripheral core 112b has a bottomed cylindrical shape in which one side is closed and the other side (the tray 6 side) is open, and is connected to the central core 112a on the closed end side.
The magnetic core 112 is arranged so that the central axis is substantially orthogonal to the tray 6 in a state where the tray 6 is present.

With such a configuration, when the tray 6 is present, an annular magnetic circuit 120 is formed by the central core 112a, a part of the tray 6 and the outer core 112b.
Further, in the state where the tray 6 is not present, the magnetic circuit 120 is formed with a space between the central core 112a and the outer core 112b.
Thus, as in the first embodiment, the inductance of the magnetic path is large when the tray 6 is present, and the magnetic path inductance is small when the tray 6 is not present. The presence or absence of the tray 6 is detected based on the current flowing through 111.

Further, as shown in FIG. 13C, the distance between the center core 112a and the outer core 112b is L1, and the end of the magnetic core 112 (the center core 112a and the outer core 112b of the outer core 112b in the state where the tray 6 is present). When the distance between the end) and the tray 6 is L2, the magnetic core 112 is arranged so that L1> L2.
That is, the distance (L2) between the magnetic core 112 and the tray 6 in the state where the tray 6 is present is arranged closer than the distance (L1) between the center core 112a and the outer core 112b of the magnetic core 112.
With such an arrangement, the inductance of the magnetic path due to the presence / absence of the tray 6 changes greatly, and the detection accuracy of the presence / absence of the tray 6 can be improved.

The other configuration and the operation for detecting the presence / absence of the tray 6 are the same as those in the first embodiment.
Moreover, the judgment of the presence or absence of washing | cleaning of the saucer 6, the prohibition of a heating operation | movement, and the alerting | reporting operation | movement are the same as that of any of the said Embodiment 1-4.

  Even in the configuration as described above, the same effects as those of the first to fourth embodiments can be obtained.

Embodiment 6 FIG.
FIG. 14 is a diagram schematically showing the configuration of the tray detector 100 according to the sixth embodiment.
FIG. 14A shows a front sectional view, and FIG. 14B shows a side sectional view. FIG. 14C is a view for explaining the arrangement position of the magnetic core 112.
As shown in the figure, the magnetic core 112 in the present embodiment is formed in a rod shape, a central core 112a around which an exciting coil 111 is wound, and a pair of outer cores 112c1 and 112c2 arranged with the central core 112a interposed therebetween. have.
The central core 112a is formed in a prismatic shape, for example.
The outer cores 112c1 and 112c2 are each formed in a prismatic shape, and one end of each of the outer cores 112c1 and 112c2 is connected to the end of the central core 112a. That is, the center core 112a and the outer cores 112c1 and 112c2 have an E-shaped cross section with an opening on the tray 6 side.
The magnetic core 112 is disposed so that the ends of the center core 112 a and the outer cores 112 c 1 and 112 c 2 face the tray 6 in a state where the tray 6 is present.

With such a configuration, in the state where the tray 6 is present, an annular magnetic circuit 120a is formed by the central core 112a, a part of the tray 6 and the outer core 112c1, and the central core 112a and a portion of the tray 6 The outer core 112c2 forms an annular magnetic circuit 120b.
In the state where there is no tray 6, the magnetic circuit 120a is formed with a space between the center core 112a and the outer core 112c1, and the magnetic circuit 120b with a space between the center core 112a and the outer core 112c2. Is formed.
Thus, as in the first embodiment, the inductance of the magnetic path is large when the tray 6 is present, and the magnetic path inductance is small when the tray 6 is not present. The presence or absence of the tray 6 is detected based on the current flowing through 111.

14C, the distance between the central core 112a and the outer cores 112c1 and 112c2 is L1, and the end of the magnetic core 112 (the central core 112a and the outer core in the state where the tray 6 is present). 112c1, the end of 112c2) and the tray 6 is L2, the magnetic core 112 is arranged so that L1> L2.
That is, the distance (L2) between the magnetic core 112 and the saucer 6 in the state where the saucer 6 is present is arranged closer than the distance (L1) between the center core 112a of the magnetic core 112 and the outer cores 112c1 and 112c2.
With such an arrangement, the inductance of the magnetic path due to the presence / absence of the tray 6 changes greatly, and the detection accuracy of the presence / absence of the tray 6 can be improved.

The other configuration and the operation for detecting the presence / absence of the tray 6 are the same as those in the first embodiment.
Moreover, the judgment of the presence or absence of washing | cleaning of the saucer 6, the prohibition of a heating operation | movement, and the alerting | reporting operation | movement are the same as that of any of the said Embodiment 1-4.

  Even in the configuration as described above, the same effects as those of the first to fourth embodiments can be obtained.

Embodiment 7 FIG.
In the first to sixth embodiments, the description has been given of the mode in which the alternating current is supplied to the exciting coil 111 to generate the magnetic flux.
In a state where the tray 6 is present, an attractive force (repulsive force) is generated in the tray 6 by the magnetic flux from the exciting coil 111.
When the polarity of the alternating current supplied to the exciting coil 111 changes, there is a moment when the magnetic flux becomes zero. At the moment when the magnetic flux becomes zero, this attractive force (repulsive force) also becomes zero.
When the polarity of the alternating current changes in this way, the suction force (repulsive force) on the tray 6 is repeatedly generated and extinguished, and the tray 6 vibrates. This vibration causes sound generation.
In the present embodiment, a mode for suppressing such vibration will be described.

FIG. 15 is a diagram schematically showing the configuration of the tray detector 100 according to the seventh embodiment.
FIG. 15A shows a front sectional view, and FIG. 15B shows a side sectional view.
As shown in FIG. 15, the saucer detection means 100 in the present embodiment has a closed coil 114 wound around the outer core 112c2 in addition to the configuration of the sixth embodiment (FIG. 14). The closed coil 114 connects the ends of the windings to form a closed circuit.
Other configurations are the same as those in the sixth embodiment, and the same parts are denoted by the same reference numerals.

  Although the case where the closed coil 114 is wound around the outer core 112c2 will be described here, the present invention is not limited to this. The closed coil 114 may be provided on either one of the pair of outer cores 112c1 and 112c2.

FIG. 16 is a diagram for explaining the phase difference of magnetic flux in the magnetic circuit according to the seventh embodiment.
In FIG. 16, the magnetic flux A indicates the magnetic flux of the magnetic circuit 120a formed by the outer core 112c1 and the central core 112a. The magnetic flux B indicates the magnetic flux of the magnetic circuit 120b formed by the outer core 112c2 and the central core 112a around which the closed coil 114 is wound.
As shown in FIG. 16, both the magnetic flux A and the magnetic flux B change in magnitude and polarity (direction) according to the alternating current supplied to the exciting coil 111, but by providing the closed coil 114, the magnetic flux A And the magnetic flux B have a phase difference.
By such a phase difference, it is possible to prevent both the magnetic flux A and the magnetic flux B from becoming zero.

As described above, in the present embodiment, since the closed coil 114 is provided in one of the pair of outer cores 112c, the magnetic flux A of the magnetic circuit 120a formed by one of the outer cores 112c and the central core 112a, and the outer A phase difference occurs between the magnetic flux B of the magnetic circuit 120b formed by the other of the cores 112c and the central core 112a.
Therefore, the suction force (repulsive force) with respect to the saucer 6 can be continuously generated, and the vibration generated in the saucer 6 can be suppressed.

Embodiment 8 FIG.
In the present embodiment, a mode will be described in which a direct current (bias) is superimposed on an alternating current so that the polarity of the alternating current supplied to the exciting coil 111 is constant.

The configuration of the present embodiment is the same as that of any of the first to seventh embodiments, and the same parts are denoted by the same reference numerals.
The operation for detecting the presence / absence of the pan 6 and the operation for determining the presence / absence of washing of the pan 6 are the same as those in any of the first to seventh embodiments.

FIG. 17 is a diagram illustrating an alternating current supplied to the exciting coil 111 according to the eighth embodiment.
In the present embodiment, the direct current is superimposed on the alternating current so that the polarity of the alternating current supplied from the alternating current signal 113 to the exciting coil 111 is constant.
For example, as shown in FIG. 17, a direct current (bias) larger than the maximum amplitude of the alternating current is superimposed.
The polarity of the direct current may be either plus or minus.

  As described above, in the present embodiment, since the direct current is superimposed on the alternating current so that the polarity of the alternating current supplied to the exciting coil 111 is constant, the attractive force (repulsive force) to the tray 6 is continued. The vibration generated in the tray 6 can be suppressed.

  DESCRIPTION OF SYMBOLS 1 Heating chamber, 2 doors, 3 taking, 4 to-be-heated object, 6 saucer, 7 grill, 8 lower heater, 9 upper heater, 10 guide rail, 13 exhaust port, 14 exhaust port cover, 18 middle plane board, 20 body, 21 induction heating coil, 23 operation / display panel, 24 top plate, 26 radiant heater, 50 exhaust duct, 100 saucer detection means, 110 magnetic flux generation means, 111 excitation coil, 112 magnetic core, 112a central core, 112b outer circumference Core, 112c outer core, 113 AC signal, 114 closed coil, 120 magnetic circuit, 130 magnetic flux detection means, 131 current detection means, 200 control means.

Claims (20)

A heating chamber provided in the main body,
A heating means provided in the heating chamber for heating an object to be heated;
A tray that is detachably disposed in the heating chamber, and on which the object to be heated is placed;
A saucer detecting means for detecting the presence or absence of the saucer;
Based on the heating operation of the heating means and the detection result of the saucer detection means, a control means for determining whether or not the saucer is washed,
The tray detection means includes
Magnetic flux generating means for generating magnetic flux,
The cooking device characterized by detecting the presence or absence of the tray by the change of the magnetic flux. The magnetic flux generating means is constituted by a coil wound around a magnetic core,
The tray detection means includes
An alternating current is supplied to the coil, and in a state where the tray is present, an annular magnetic circuit is formed by at least a part of the tray and the magnetic core,
The cooking device according to claim 1, wherein the presence or absence of the tray is detected based on a current flowing through the coil. The magnetic core is
Formed in a substantially U-shaped cross section,
The cooking device according to claim 2, wherein in a state where the saucer is present, the U-shaped open side is disposed so as to face the saucer. The distance (L2) between the end of the U-shaped open side of the magnetic core and the saucer when the saucer is present,
The cooking device according to claim 3, wherein the cooking device is closer to a distance (L1) between both end portions of the U-shaped open side of the magnetic core. The magnetic core is
A central core formed in a rod shape and wound with the coil;
Formed in a cylindrical shape, and having an outer peripheral core disposed concentrically with the central core,
The cooking device according to claim 2, wherein in a state where the saucer is present, the cooking device is arranged so that a central axis is orthogonal to the saucer. The distance (L2) between the magnetic core and the saucer when the saucer is present,
The cooking device according to claim 5, wherein the distance between the central core of the magnetic core and the outer core is shorter than the distance (L1). The magnetic core is
A central core formed in a rod shape and wound with the coil;
A pair of outer cores arranged with the central core in between,
The cooking device according to claim 2, wherein in a state where the saucer is present, the end portions of the central core and the outer core are disposed so as to face the saucer. The distance (L2) between the magnetic core and the saucer when the saucer is present,
The cooking device according to claim 7, wherein the heating core is closer than a distance (L1) between the central core and the outer core of the magnetic core. A closed coil wound around one of the pair of outer cores;
Magnetic flux of a magnetic circuit formed by one of the outer cores and the central core;
The cooking device according to claim 7 or 8, wherein a phase difference is generated between magnetic fluxes of a magnetic circuit formed by the other of the outer cores and the central core. The tray detection means includes
The cooking device according to any one of claims 2 to 9, wherein a direct current is superimposed on the alternating current so that the polarity of the alternating current supplied to the coil is constant. A door for opening and closing the opening of the heating chamber;
A guide rail connected to the door and supporting the tray so that it can be pulled out of the heating chamber within a predetermined range;
The tray detection means includes
The cooking device according to any one of claims 1 to 10, wherein a state where the tray is present is detected in a state where the tray is pulled out within the predetermined range. The control means includes
The heating device according to any one of claims 1 to 11, wherein when the heating by the heating unit is stopped and the state where the tray is not present continues for a predetermined time or more, it is determined that the tray is washed. The heating cooker described in 1. The control means includes
The cooking device according to claim 12, wherein when the tray is not determined to have been washed, heating by the heating means is not started. Providing a notification means,
The control means includes
The cooking device according to claim 12 or 13, wherein, when it is not determined that the saucer has been washed, information notifying that the saucer is to be washed is notified by the notifying means. The control means includes
Count the number of times of heating by the heating means,
The cooking device according to claim 12, wherein when the number of times is equal to or more than a predetermined number and it is not determined that the tray has been washed, heating by the heating means is not started. Providing a notification means,
The control means includes
Count the number of times of heating by the heating means,
The information notifying that the cleaning of the tray is urged is notified by the notification means when the number of times is equal to or more than a predetermined number and it is not determined that the tray has been cleaned. The cooking device described. The control means includes
Integrating the heating time by the heating means,
The cooking device according to claim 12, wherein when the accumulated time is equal to or longer than a predetermined accumulated time and it is not determined that the tray has been washed, heating by the heating means is not started. Providing a notification means,
The control means includes
Integrating the heating time by the heating means,
When the accumulated time is equal to or longer than a predetermined accumulated time and it is not determined that the saucer has been washed, information for prompting washing of the saucer is notified by the notifying means. Item 18. A cooking device according to Item 12 or 17. The control means includes
The cooking device according to any one of claims 1 to 18, wherein heating by the heating means is not performed when there is no tray. Providing a notification means,
The control means includes
The cooking device according to any one of claims 1 to 19, wherein, in a state where there is no tray, information indicating misuse is notified by the notification unit.

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