JP5064013B2 - Cooking equipment - Google Patents

Description

  The present invention relates to a cooking device that includes at least induction heating means for cooking food stored in a cooking cabinet.

  Microwave ovens directly heat high-frequency foods using microwaves, so they are very effective for high-speed cooking such as warming, but they cannot burn foods and are not suitable for scorched cooking. On the other hand, induction heating (IH) cookers, which have been popularized in recent years, are ideal for cooking by cooking or cooking for cooking by heating a magnetic metal pan or the like by induction heating. Therefore, in order to make up for the drawbacks of cooking by high-frequency heating as described above, a composite-type cooking device using both high-frequency cooking and induction cooking has been known.

  For example, in the heating and cooking apparatus described in Patent Document 1, an induction heating coil is disposed below the bottom surface of a substantially box-shaped cooking chamber, and a cooking dish placed on the bottom surface of the cooking chamber is guided by the magnetic flux generated from the coil. It can be heated. On the other hand, a magnetron is arranged behind the cooking chamber, and microwaves generated from the magnetron are supplied into the cooking chamber through a power supply port formed on the upper surface of the cooking chamber, and thereby the food placed on the cooking pan is removed. High frequency heating can be performed. This type of heating cooking apparatus is suitable for performing burnt-eye cooking or stew cooking on foods stored in a container such as a pan or a frying pan having a configuration capable of induction heating.

  In the combined cooking device as described above, it is necessary to prevent microwave leakage from the inside of the cooking chamber, while the magnetic flux generated from the induction heating coil enters the cooking chamber with as little loss as possible and heats it. It is necessary to penetrate the target pot. Therefore, the bottom wall surface of the cooking chamber is configured by a punching plate having a large number of small holes, and a flat plate-shaped mounting plate made of a low-loss dielectric is installed thereon. The punching plate cuts off the microwave while allowing the magnetic flux to pass with high efficiency, and the mounting table is difficult to absorb the microwave and is not induction-heated even if the magnetic flux penetrates, so the object to be heated placed on the mounting table Can be satisfactorily heated by microwave and induction.

  However, the punching plate is hardly heated by induction, but is slightly heated by the action of a part of the magnetic flux penetrating the sheet metal portion. Further, the temperature of the punching plate also rises due to the temperature rise of the induction heating coil itself and the effect of heat conduction from the pan through the mounting table. Since the punching plate has a large number of small holes, the punching plate is relatively low in rigidity. When the punching plate is heated to a high temperature as described above, it is likely to warp due to thermal expansion. When the punching board is warped, various problems occur.

(1) When the punching plate is warped, the distance between the punching plate and the bottom surface of the pan on the mounting table changes, and the efficiency of induction heating may be reduced.
(2) If the punching plate is repeatedly warped or returned to its original state by heating / cooling, the punching plate is likely to be broken and a problem arises in terms of durability.
(3) Even if an appropriate gap is initially formed between the lower surface of the mounting table and the punching plate, if the punching plate warps upward and contacts the mounting table due to thermal expansion, the mounting table itself is considerably It becomes high temperature. In general, ceramics and the like used for the mounting table have characteristics that the dielectric loss increases at a high temperature. Therefore, the dielectric loss of the mounting table increases due to the heat conduction as described above, and it is easy to absorb microwaves. The efficiency of microwave heating is reduced.

  In addition, the above-described combined heating cooking apparatus uses a combination of microwave heating and induction heating, for example, cooking such as hamburger, dumplings, etc., that heats the food inside while attaching moderate burnt eyes to the food. This is especially useful when cooking is required in a short time for business use. In such an application, it is necessary to shorten the time for putting the heated object in and out of the cooking chamber. However, the cooking container placed on the mounting table itself becomes very hot, so it is troublesome to take in and out such a container. There is a problem that it takes time and is a loss of time. In addition, in the case of induction heating, if the cooking container is placed at a position off the top of the induction heating coil, the heating efficiency is lowered, so that the cooking container is optimally heated in the cooking chamber without any particular attention from the user. It is desired to be placed in position.

  In addition, in such a combined cooking device, oil cooking is often used, so oily smoke is likely to be generated in the cooking chamber, and the oil in the exhaust duct that exhausts the air in the cooking chamber to the outside of the machine is also contaminated with oily smoke. Easy to adhere. If the oil stain becomes severe, not only is it not preferable for hygiene, but there is a problem in terms of safety because ignition accidents are likely to occur. However, in general, the exhaust duct is difficult to clean, and there is a problem that it takes time and effort to clean.

JP 2006-207874 A

  The present invention has been made to solve the above-described problems, and suppresses a temperature rise of a magnetic flux passage member such as a punching plate in a composite cooking apparatus having both high-frequency heating means and induction heating means. Is the first purpose.

  In particular, in a cooking device having an induction heating means, the object to be heated can be easily put in and out of the cooking chamber, and the object to be heated can be placed at the optimum induction heating position. The purpose of 2 is.

  A third object of the present invention is to make it easier to clean the inside of the exhaust duct for discharging the air in the cooking chamber to the outside in the combined cooking device having both the high frequency heating means and the induction heating means.

A first invention made to achieve the first object is a high-frequency heating including a box-shaped cooking chamber and a magnetron that generates microwaves for high-frequency heating of food stored in the cooking chamber. A heating cooking apparatus comprising: means and induction heating means including an induction heating coil that generates an alternating magnetic flux for induction heating the heating element accommodated in the cooking chamber;
At least a part of the bottom wall surface of the cooking chamber allows the magnetic flux generated from the induction heating coil disposed below it to pass therethrough, while a large number of small holes with a predetermined diameter are perforated to prevent the passage of microwaves. Formed from materials for
On the upper part of the magnetic flux passage member is disposed a mounting plate made of an insulator capable of mounting the heating element with one or more insulating members interposed therebetween,
The one or more insulating members suppress the conduction of the heat of the mounting plate to the magnetic flux passage member and form a ventilation path for cooling the magnetic flux passage member ,
At least one of the insulating members provided on the upper side of the magnetic flux passage member integrally has a pressing portion that suppresses warpage of the magnetic flux passage member, and
Another air passage for cooling the magnetic flux passage member and the induction heating coil is formed by one or more insulating members provided between the magnetic flux passage member and the induction heating coil. Yes.

  In the cooking device according to the first invention and each of the following inventions, a punching plate in which a large number of small holes are formed in a metal plate such as stainless steel can be used as the magnetic flux passage member.

  In the cooking device according to the first aspect of the present invention, the flat ventilation in which the peripheral surface is surrounded by one or more insulating members arranged to form a gap between the mounting plate and the magnetic flux passage member. A path is formed. The upper surface of the magnetic flux passage member is exposed on the lower surface of the ventilation path, and the magnetic flux passage member is cooled by heat exchange between the relatively low temperature air passing through the ventilation path and the magnetic flux passage member. . In addition, when a cooking vessel that is induction-heated is placed on the placement plate, the heat of the cooking vessel is conducted to the placement plate and the placement plate also becomes hot, but the air passing through the ventilation path is a kind. It can control that the heat of a mounting board is transmitted to the member for magnetic flux passage. Thereby, the temperature rise of the member for magnetic flux passage can be suppressed.

In the cooking device according to the first aspect of the present invention, the magnetic flux passage member and the induction heating coil are further cooled by one or more insulating members provided between the magnetic flux passage member and the induction heating coil. It forms another air passage for.

  According to this configuration, the relatively low temperature air passing through another ventilation path formed between the magnetic flux passage member and the induction heating coil exchanges heat with the induction heating coil so that only the magnetic flux passage member is obtained. Instead, the induction heating coil is cooled. Further, the air passing through the other ventilation path functions as a kind of heat shield layer, and it is possible to suppress the heat of the induction heating coil from being transmitted to the magnetic flux passage member. Thereby, the temperature rise of the magnetic flux passage member can be further suppressed. Furthermore, said another ventilation path can also suppress that the heat | fever of the magnetic flux passage member is transmitted to the induction heating coil.

In the cooking device according to the first aspect of the present invention, at least one of the insulating members provided on the upper side of the magnetic flux passage member integrally has a pressing portion that suppresses warpage of the magnetic flux passage member. Is doing .

According to this configuration, at least one of the insulating members provided on the upper side of the magnetic flux passage member integrally includes a holding portion that suppresses warpage of the magnetic flux passage member, thereby allowing the magnetic flux passage. Even when the temperature of the member for heating rises and the thermal expansion occurs, the warping upward is suppressed by the holding part, so the distance between the bottom surface of the cooking container placed on the mounting plate and the member for passing magnetic flux is short. In addition, a decrease in induction heating efficiency due to the shortening of the distance can be prevented. Further, since the magnetic flux passing member can be prevented from coming into contact with or very close to the lower surface of the mounting plate, it is possible to avoid the heat of the magnetic flux passing member from being conducted to the mounting plate. Thereby, an increase in dielectric loss due to an abnormal temperature rise of the mounting plate can be prevented, and a decrease in the efficiency of high-frequency heating can also be avoided. Further, it is possible to prolong the life of the magnetic flux passage member by preventing the magnetic flux passage member from warping due to heating and returning from the warpage due to cooling .

A second invention made to achieve the first object is a high-frequency heating including a box-shaped cooking chamber and a magnetron that generates microwaves for high-frequency heating of food stored in the cooking chamber. A heating cooking apparatus comprising: means and induction heating means including an induction heating coil that generates an alternating magnetic flux for induction heating the heating element accommodated in the cooking chamber;
At least a part of the bottom wall surface of the cooking chamber is formed of a magnetic flux passage member that blocks the passage of microwaves while allowing the magnetic flux generated from the induction heating coil disposed below the passage to pass through.
On the upper part of the magnetic flux passage member, a placing plate made of an insulator on which the heating element can be placed with one or more upper insulating members sandwiched therebetween is disposed,
The one or more upper insulating members suppress the conduction of heat of the mounting plate to the magnetic flux passage member and form a first ventilation path for cooling the magnetic flux passage member,
The magnetic flux passage member is cooled between one of the lower insulation members and the magnetic flux passage member by a plurality of lower insulation members provided between the magnetic flux passage member and the induction heating coil. The second ventilation path is characterized in that a third ventilation path for cooling the induction heating coil is formed between one of the lower insulating members and the induction heating coil.

In the cooking device according to the second aspect, the upper surface of the magnetic flux passage member is exposed on the lower surface of the first air passage formed between the mounting plate and the magnetic flux passage member, and the first air passage. The relatively low-temperature air passing through and the magnetic flux passage member exchange heat to cool the magnetic flux passage member. In addition, when a cooking vessel to be induction-heated is placed on the placement plate, the heat of the cooking vessel is conducted to the placement plate and the placement plate also becomes hot, but the air passing through the first ventilation path Functions as a kind of heat shield layer, and it is possible to suppress the heat of the mounting plate from being transmitted to the magnetic flux passing member. Further, the lower surface of the magnetic flux passage member is exposed on the upper surface of the second air passage formed between the magnetic flux passage member and the induction heating coil, and relatively low-temperature air and magnetic flux passing through the second air passage. The magnetic flux passing member is cooled by exchanging heat with the passing member. Furthermore, the upper surface of the induction heating coil is exposed on the lower surface of the third ventilation path formed between the magnetic flux passage member and the induction heating coil, and relatively low-temperature air passing through the third ventilation path and The induction heating coil is cooled by exchanging heat with the induction heating coil. Further, the air passing through the second and third ventilation paths functions as a kind of heat shield layer, and the heat of the induction heating coil can be prevented from being transmitted to the magnetic flux passage member. Thereby, the temperature rise of the member for magnetic flux passage can be suppressed more effectively. Furthermore, the second and third ventilation paths can also suppress the heat of the magnetic flux passage member from being transmitted to the induction heating coil.

  Further, as one aspect thereof, the pressing portion may be an elongated shape, one end of which is supported, and the other end is opened toward the ventilation path.

  According to this configuration, even when the pressing portion is provided, an air flow is ensured on the open end side facing the ventilation path, so that the magnetic flux passage member can be sufficiently cooled.

  Moreover, it is good for the said holding | suppressing part to be set as the structure provided in multiple numbers radially inside the torus.

  According to this configuration, it is possible to remarkably prevent warping of the magnetic flux passage member by pressing the magnetic flux passage member almost uniformly from the periphery thereof.

In the cooking device according to the first or second invention, the bottom wall surface of the cooking chamber is rectangular, and an intake port for sending air to the ventilation path is provided below one corner on the front side. In addition, an exhaust port that discharges the air that has passed through the ventilation path can be provided below the corner on the rear side that is located diagonally to the corner.

  The induction heating coil, magnetic flux passing member, etc. have a circular outer shape, but the bottom wall surface of the cooking cabinet is rectangular, so its corner tends to become a dead space, but the corner is provided with an inlet and an outlet, Furthermore, the space can be effectively used by installing a blower mechanism such as a fan for blowing air or a fan motor. Thereby, it is not necessary to unnecessarily increase the size of the cooking chamber in order to arrange such a blower mechanism and the like, and the overall size of the apparatus can be reduced.

  In addition, when a ventilation path is provided between the induction heating coil and the magnetic flux passage member, a structure including temperature detection means for detecting a temperature of air after heat exchange with the induction heating coil in the ventilation path; Good.

  For example, if the temperature of the induction heating coil rises abnormally due to the occurrence of an abnormality, the temperature of the air after passing through the ventilation path also increases. Therefore, abnormal states of the induction heating coil and its drive circuit can be reliably recognized based on the temperature detected by the temperature detecting means.

In the cooking device according to the first or second invention, the mounting plate is mainly composed of a material having a characteristic that does not increase dielectric loss in a temperature range below the temperature of the heating element during normal heating. It is preferable.

According to this configuration, since microwave absorption by the mounting plate is small during normal use, high high-frequency heating efficiency can be achieved. In general, the maximum temperature of the heating element during normal heating when induction heating and high frequency heating are used in combination is about 200 to 250 ° C., and the dielectric loss does not increase in a lower temperature range below this. Examples of the material having the above include cordierite (2MgO · 2Al ₂ O ₃ · 5SiO ₂ ).

Moreover, as one aspect, the cooking container as the heating element is held so as to be movable in the front-rear direction, and the bottom surface of the cooking container is in contact with the mounting plate in a state where the cooking container is moved backward, and the position thereof is Container holding means for moving so as to be above the induction heating coil;
It is characterized by having.

According to this configuration , when the cooking container is moved backward by the container holding means, the cooking container is set to an appropriate position for induction heating, that is, a position where heating is performed efficiently. At this time, since the bottom surface of the cooking container is in contact with the mounting plate, the distance between the induction heating coil and the bottom surface of the cooking container is always constant. Thereby, it becomes possible to perform induction heating cooking always optimal or close to it, without burdening a user with troublesome trouble. Further, when the cooking container is moved forward by the container holding means before or after cooking, the food can be easily put in and out of the cooking container. In particular, after cooking, the cooking container itself is hot, and it is difficult to take out the food and it is easy to cause burns. However, the risk of such burns can be reduced by moving the cooking container forward.

Moreover, as one embodiment, the container holding means includes a support means for supporting the cooking container, and a guide means for guiding the support means to slide forward and backward and tilt upward. it can.

  According to this configuration, when the cooking container moves forward, the food container also moves upward, so that it is possible to further easily take out the food from the cooking container.

  Even in this case, the container holding means may be configured to slide the cooking container in the front-rear direction while maintaining the levelness of the bottom surface of the cooking container.

  According to this configuration, even if the food contained in the cooking container has a relatively large amount of liquid such as soup, the liquid can be prevented from spilling as the cooking container moves.

The container holding means may have an insulating property, and the cooking container may be detachable from the container holding means.

  According to this configuration, for example, when the cooking container is washed, the cooking container can be detached from the container holding means.

Also, an exhaust duct for discharging the air in the cooking chamber to the outside, are furnished to the exhaust duct, are Bei Ete a cylindrical portion in detachable from the outside of the housing.

According to this configuration, exhaust gas such as oily smoke generated in the cooking chamber during cooking is discharged outside the machine through the inner cylinder part mounted on the exhaust duct. Adhere to the inner surface. Therefore, it is only necessary to remove this inner cylinder from the outside of the housing and clean only this. Moreover, when the dirt of the inner cylinder part becomes so severe that it becomes difficult to remove by cleaning, the inner cylinder part can be replaced with a new one. Therefore, it is possible to reduce the time and effort required for cleaning the apparatus main body, and to increase the operating efficiency of the apparatus.

Moreover , it is good to set it as the structure provided with the temperature detection means for exhaust temperature detection which protrudes inside this inner cylinder part, when the said inner cylinder part is built in the said exhaust duct.

  According to this configuration, since the temperature of the exhaust gas from the cooking chamber can be monitored by the temperature detection means, for example, an abnormal state such as burning of food is quickly detected in the cooking chamber, for example, to notify the user. Is possible.

According to the heating cooking apparatus of the present invention, it is possible to suppress the temperature rise of the magnetic flux passage member such as the punching plate even when performing the induction heating, thereby making it difficult to cause, for example, warping of the magnetic flux passage member. be able to.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a combined cooking device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an external perspective view of the cooking device 1 of the present embodiment as viewed from the upper right, FIG. 2 is an external perspective view of the cooking device 1 of the present embodiment as viewed from the upper left, and FIG. It is the external appearance perspective view seen from the diagonally upper left in the open state. FIG. 4 is a schematic side longitudinal sectional view of the cooking device 1 according to the present embodiment.

  The heating cooking apparatus 1 has a substantially rectangular parallelepiped casing 2, and a substantially rectangular parallelepiped cooking chamber 4 having a front surface opened is formed inside the casing 2. The front opening of the cooking chamber 4 is opened and closed by a side-opening door 3. A punching plate for preventing microwave leakage and a heat-resistant glass capable of seeing through the inside of the cooking cabinet 4 are installed at the center of the door 3, and the front opening of the cooking cabinet 4 is opened around the door 3 when the door 3 is closed. A microwave leakage prevention structure 3a that prevents the microwave in the cooking cabinet 4 from leaking to the outside in contact with the surrounding frame portion 4a is provided.

  An operation panel 5 having a key input unit on which a plurality of operation keys are arranged and a display unit using a segment LCD or the like is disposed at a position that is not hidden when the door 3 is closed on the front surface of the housing 2. The key input unit instructs various cooking conditions and start / stop of operation, and the display unit displays such cooking conditions and remaining operation time. An outside air intake 6 for taking in outside air mainly for cooling an induction heating unit in the housing 2 to be described later is formed wide on the lower side of the front surface of the housing 2 and below the door 3. .

  As shown in FIG. 4, when the cooking chamber 4 closes the door 3, the five surfaces except the front surface corresponding to the back surface thereof, that is, the rear surface portion 4b, the top surface portion 4c, the bottom surface portion 4d, and the left side surface portion 4e (in FIG. 4). And a substantially rectangular parallelepiped box shape having a right side surface portion 4f, and when the front opening is closed by the door 3 as described above, it is almost sealed. A cooking container 90 for storing food to be cooked is housed in the cooking cabinet 4, but here the cooking container 90 can be moved back and forth by a mechanism as will be described later. In order to heat-cook the food contained in the cooking container 90, high-frequency (microwave) heating means for cooking in a microwave oven, and induction heating means for cooking the food indirectly by heating the cooking container 90 And is attached.

  As a high-frequency heating means, a magnetron 10 that generates microwaves is installed at the rear upper part of the rear surface portion 4b of the cooking cabinet 4, and the microwaves generated by the magnetron 10 extend forward in the upper part of the housing 2. It propagates through the interior and is guided to the microwave diffusion chamber 12 provided in the top surface portion 4 c of the cooking chamber 4. Inside the microwave diffusion chamber 12 is provided a radiation antenna 13 that is rotationally driven in a substantially horizontal plane by an antenna drive motor 14, whereby microwaves are fed from a substantially central feeding port of the top surface portion 4 c of the cooking chamber 4. Radiated while diffusing inside. The food in the cooking container 90 (not shown in FIG. 4) is heated and cooked by the action of the microwave.

  On the other hand, as an induction heating means, an induction heating coil 53 for induction heating of the cooking container 90 itself is installed substantially horizontally below the bottom surface portion 4d of the cooking cabinet 4, and an induction heating coil 53 from an inverter circuit described later is installed. When a high-frequency current is supplied, an alternating magnetic flux is generated. The magnetic flux passes through the bottom surface portion 4d and enters the cooking cabinet 4, and crosses the bottom of the cooking vessel 90 formed of, for example, magnetic metal. Then, an eddy current is induced at the bottom of the cooking container 90 due to the induction action of the alternating magnetic flux, the cooking container 90 becomes high temperature due to Joule heat, and the food contained in the cooking container 90 is cooked.

  The structure of the induction heating unit 50 including the induction heating coil 53 and the bottom surface portion 4d of the cooking cabinet 4 will be described in detail with reference to FIGS. 5 is an assembly structure diagram of the induction heating unit 50 located below the bottom structure of the cooking cabinet 4, FIG. 6 is an assembly structure diagram of the induction heating unit 50, and FIG. 7 is an oblique view from the lower right with the housing removed. FIG.

  The bottom surface portion 4d of the cooking chamber 4 has a stainless steel (for example, SUS304) bottom plate 40 formed with a large circular opening, an annular bottom plate metal fitting 41 of the same material, and a large number of small holes with a predetermined diameter. And a circular punching plate (corresponding to a member for passing magnetic flux in the present invention) 42 made of the same material. The bottom plate fitting 41 and the punching plate 42 are integrated by a strong fixing method such as spot welding, and they are fixed to the bottom plate 40 by screws 46 and nuts 47 inserted through screw holes on the outer peripheral edge of the bottom plate fitting 41. . For example, the plate thickness of the bottom plate 40 and the bottom plate metal fitting 41 is 0.5 mm and its rigidity is high, but the punching plate 42 is made as thin as 0.1 mm in order to increase the passage efficiency of magnetic flux.

  An upper first insulating member 43 and an upper second insulating member 44, which are, for example, mica plates, are mounted on the bottom surface portion 4d of the cooking cabinet 4, and a placement for placing a cooking container containing food on it is mounted. A plate 45 is placed. A seal member 48 made of, for example, silicone rubber is provided in a gap between the peripheral edge of the mounting plate 45 and the standing wall surface of the cooking cabinet 4, and liquid spilled in the cooking cabinet 4 is placed below the mounting plate 45. It is hard to fall.

The mounting plate 45 needs to pass a magnetic flux for induction heating, but needs to be a low-loss dielectric material so that it is difficult to be heated by microwaves at high frequencies. In addition, heat resistance is also necessary because it is in direct contact with a cooking container that becomes hot. Therefore, for example, the mounting plate 45 can be made mainly of cordierite (2MgO · 2Al ₂ O ₃ · 5SiO ₂ ). When induction heating and high-frequency heating are performed simultaneously, the temperature of the cooking vessel is about 200 to 250 ° C. at the maximum, but cordierite has a small dielectric loss in a temperature range below that temperature. Therefore, during normal use, the microwave absorption by the mounting plate 45 can be reduced, and the efficiency of high-frequency heating can be increased.

  8A and 8B are detailed views of the mounting plate 45, where FIG. 8A is a top plan view, FIG. 8B is a front plan view, and FIG. 8C is an enlarged cross-sectional view of a portion A in FIG. The mounting plate 45 has a shape in which a peripheral edge 45a is inclined upward toward the outer periphery over the entire periphery. Thereby, when liquids, such as a juice of food and oil, spilled on the mounting board 45, it can prevent flowing down from the peripheral edge of the mounting board 45. FIG.

  The upper first insulating member 43 that is in close contact with the bottom plate 40 integrally has a plurality of strip-shaped extending pieces 43b integrally formed on the inner peripheral edge of the annular portion 43a. The extending pieces 43b are punched plates. It functions as a retaining portion in the present invention that prevents warping of 42 upward.

  On the other hand, the upper second insulating member 44 has a shape having a large opening 44a inside. Each of the upper first insulating member 43 and the upper second insulating member 44 has an outer peripheral side that is connected over the entire circumference, and an opening is formed on the inner peripheral side, so that the punching plate 42 is the lower surface and the mounting plate 45 is A flat air gap is formed with the upper first insulating member 43 and the upper second insulating member 44 as side surfaces (circumferential surfaces) on the upper surface, and this becomes the ventilation path (or first ventilation path) T1 above the punching plate 42. . The contact surface between the bottom surface portion 4d and the upper first insulating member 43, the contact surface between the upper first insulating member 43 and the upper second insulating member 44, and the contact surface between the upper second insulating member 44 and the mounting plate 45 are as follows. Since they are in close contact with each other, the air passage T1 has a structure in which almost no airflow leaks from the side surface.

  In the induction heating unit 50 installed below the punching plate 42, as shown in FIG. 6, a flat, substantially disk-like shape formed by winding a flat plate inside a case 51 whose upper surface is open. An induction heating coil 53 is accommodated. An air inlet 51a serving as an air inlet to the ventilation path T1 and other ventilation paths T2 and T3 to be described later is formed in the corner at the right end of the front side of the case 51. An induction heating unit cooling fan unit 52 including a fan that is driven to rotate is mounted. On the other hand, an exhaust port 51b serving as an air outlet from the ventilation paths T1, T2, and T3 is formed at a position facing the intake port 51a across the center of the induction heating coil 53. The exhaust port 51b is provided with a temperature sensor 57 that detects the temperature of the discharged air.

  Above the induction heating coil 53, that is, between the induction heating coil 53 and the punching plate 42, for example, a lower first insulating member 54, a lower second insulating member 55, and a lower third plate which are mica plates and have different shapes. An insulating member 56 is attached. The uppermost lower third insulating member 56 is substantially annular. The lower second insulating member 55 in the middle has a substantially disk shape and has an opening 55a on the rear side and a recess 55b recessed inward from the outer edge on the front side. The lowermost lower first insulating member 54 has a substantially disc shape, and a circular opening 54a is formed at the center. A cutout portion 54b connected from the opening 54a to the outer peripheral edge is provided on the front side thereof. On the rear side, there is a concave portion 54c recessed in a fan shape from the opening 54a.

  By stacking the lower first, second, and third insulating members 54, 55, 56 having such characteristic shapes, the lower second insulating member 55 is interposed between the induction heating coil 53 and the punching plate 42. As a partition, a second ventilation path T2 is formed on the upper side, and a third ventilation path T3 is formed on the lower side. That is, the second ventilation path T2 is a ventilation path formed in a flat gap with the punching plate 42 as an upper surface, the lower second insulating member 55 as a lower surface, and the lower third insulating member 56 as a side surface (circumferential surface). The recess 55b of the lower second insulating member 55 is an air inlet, and the opening 55a is an air outlet. The third ventilation path T3 is a ventilation path formed in a flat air gap having the lower second insulating member 55 as an upper surface, the upper surface of the induction heating coil 53 as a lower surface, and the lower first insulating member 54 as a side surface (circumferential surface). In addition, the notch 54b is an air inlet and the recess 54c is an air outlet.

  The first, second, and third ventilation paths T1, T2, and T3 are all ventilation paths that have the intake port 51a as an air inlet and the exhaust port 51b as an air outlet. The relatively low temperature outside air sucked through the intake port 6 is branched into three ventilation paths T1, T2, and T3 and flows in parallel, and merges at the exhaust port 51b and passes through the exhaust path 20 to the lower rear surface of the housing 2. It is discharged out of the machine through the formed exhaust port 8. The first ventilation path T1 mainly cools the punching plate 42 from above, and blocks the heat from the mounting plate 45 that is heated by conduction of heat from the cooking vessel 90 from being transmitted to the punching plate 42. Is. The second ventilation path T2 is mainly for cooling the punching plate 42 from below, and the third ventilation path T3 is mainly for cooling the induction heating coil 53. Further, the second ventilation path T2 and the third ventilation path T3 function to block the heat from the induction heating coil 53 from being transmitted to the punching plate 42 and to block the heat from the punching plate 42 from being transmitted to the induction heating coil 53. Also have.

  In the induction heating unit 50 configured as described above, when a high frequency current is supplied to the induction heating coil 53 from an induction heating coil driving inverter circuit (not shown), an alternating magnetic flux is generated. The magnetic flux passes through the punching plate 42 and the mounting plate 45 and enters the cooking chamber 4, and at least crosses the bottom of the cooking container 90 whose bottom is formed of magnetic metal. An eddy current is induced at the bottom of the cooking container 90 by the induction action, the cooking container 90 is heated by Joule heat, and the food to be cooked accommodated in the cooking container 90 is heated.

  The punching plate 42 is formed with a large number of small holes for allowing the magnetic flux generated from the induction heating coil 53 to pass therethrough, and the plate thickness thereof is thin. However, a part of the magnetic flux is vortexed when penetrating the punching plate 42. A current is induced, and the temperature of the punching plate 42 increases due to the current loss. In addition, the induction heating coil 53 itself generates heat due to the current loss of the current flowing through the coil, and the mounting plate 45 does not generate heat itself, but the temperature rises due to heat conduction from the cooking vessel 90, so the punching plate 42. Also receives radiant heat from the induction heating coil 53 and the mounting plate 45. In particular, when the frequency of use of the apparatus is high, for example, for business use, heat is accumulated and the temperature tends to increase. On the other hand, in the cooking device 1 of the present embodiment, the punching plate 42 can be efficiently cooled by the air flow passing through the first to third ventilation paths T1, T2, T3, and the influence of radiant heat can be reduced. The temperature rise can be suppressed. Moreover, since the induction heating coil 53 can be efficiently cooled by the airflow passing through the third ventilation path T3, the temperature rise can also be suppressed.

  Further, even if the punching plate 42 rises in temperature and tends to warp upward due to thermal expansion, the extended pieces 43b provided in a plurality of radial shapes in the first ventilation path T1 will cause this warp over its entire circumference. Hold almost evenly. Therefore, the punching plate 42 does not warp, and the punching plate 42 contacts the lower surface of the mounting plate 45, or the distance between the bottom surface of the cooking container 90 on the mounting plate 45 and the punching plate 42 is reduced. This can be prevented. Since the extended piece 43b protrudes into the first ventilation path T1, it can be a flow resistance for the air flow from the intake port 51a to the exhaust port 51b through the ventilation path T1, but the extended piece on the inner peripheral side. Since the end of 43b is open, the flow resistance can be reduced and a smooth air flow can be ensured.

  The first ventilation path T1 is configured to occupy an area of 50% or more of the planar area determined by the same outer diameter of the upper first insulating member 43 and the upper second insulating member 44. Thereby, the air sucked by the induction heating unit cooling fan unit 52 flows favorably in the first ventilation path T1 and is effective in suppressing the temperature rise of the punching plate 42.

  Also, since the bottom surface portion 4d of the cooking chamber 4 is rectangular and the outer shape of the induction heating coil 53 is a flat cylindrical shape, the bottom of the bottom surface portion 4d of the cooking chamber 4 tends to be a dead space. Since the intake port 51a and the induction heating unit cooling fan unit 52 are provided below the corner, and the exhaust port 51b is provided below the left corner of the rear surface of the bottom surface portion 4d, the dead space is effectively used. And it is not necessary to enlarge the size of the cooking chamber 4 more than necessary.

  In addition, as a modification of the upper first insulating member 43, a member shown in a perspective view in FIG. 14 may be used. The upper first insulating member 43A shown in FIG. 14A has a structure in which extending pieces 43b for suppressing warpage are provided in a comb shape instead of radially inside the annular portion 43a. The extending pieces 43b are arranged substantially in parallel, and the upper first insulating member 43 is mounted so that the extending direction thereof coincides with the direction of the air flow from the intake port 51a to the exhaust port 51b. As a result, the extending piece 43b exerts an action of suppressing the warp of the punching plate 42 and also exhibits a rectifying action of ensuring a smooth flow by aligning the direction of the air flow in the first ventilation path T1.

  Further, the upper first insulating member 43B shown in FIG. 14B has a structure in which radial slits 43d in which the outer peripheral edge of the disc-like body 43c is opened are formed. In this structure, although the size of the first ventilation path T1 in the height direction is reduced, the action of suppressing the warping of the punching plate 42 can be enhanced.

  As described above, the heating cooking apparatus 1 of the present embodiment includes the induction heating coil 53 and the magnetron 10 as heating sources, but an inverter circuit for driving these is also provided independently. Therefore, the induction heating operation and the high frequency heating operation can be performed in parallel, thereby shortening the cooking time. Of course, in addition to simultaneous heating, independent operation of induction heating operation and high-frequency heating operation or alternate operation of both are also possible. Furthermore, it is also possible to perform a multi-stage operation in which a plurality of stages are freely combined, with simultaneous operation, single operation or alternating operation as one stage.

  The inverter circuit as described above includes a power switching element (for example, a power FET). Since the amount of heat generated during operation is large, it is necessary to appropriately dissipate heat. For example, the cooling of the inverter circuit for driving the induction heating coil can be performed by using the air blow by the fan for cooling the induction heating coil 53 and the punching plate 42 described above, but if both are used, both are sufficient. The cooling effect may not be obtained and the temperature may become too high. Therefore, in the heating cooking apparatus 1 of this embodiment, a fan and a ventilation path for cooling the induction heating coil driving inverter circuit are provided in addition to the above-described induction heating unit cooling fan and ventilation path. This structure will be described with reference to FIGS.

  The outside air inlet 7 is formed long in the longitudinal direction in front of the right side surface of the housing 2, and the ventilation path 21 communicating with the outside air inlet 7 is formed so as to extend backward inward of the right side surface of the housing 2. Has been. An inverter cooling fan 22 for driving the induction heating coil is disposed behind the cooking chamber 4 at the rear of the ventilation path 21. The relatively low temperature outside air sucked from the outside air inlet 7 by the operation of the fan 22 flows backward in the ventilation path 21 to the position of the fan 22, as indicated by an arrow in FIG. The direction is changed to the left and passes through the circuit box 23 in which the circuit board on which the inverter circuit for driving the induction heating coil is mounted is accommodated. Then, the air is discharged from the exhaust port 9 on the rear surface of the housing 2 to the outside of the apparatus.

  The induction heating coil driving inverter circuit generates heat when induction heating is performed, but the induction heating coil driving inverter cooling fan 22 is not connected to the induction heating coil 53 or the punching plate 42 as described above. Heat is efficiently radiated by air flowing through the operation. Thereby, abnormal temperature rises, such as an induction heating coil drive inverter circuit, can be avoided.

  Next, an exhaust structure for discharging the air in the cooking chamber of the heating cooking apparatus 1 of the present embodiment to the outside of the apparatus will be described with reference to FIGS. 9 is an external perspective view of the cooking device of the present embodiment with the exhaust inner cylinder lid removed, FIG. 10 is an external perspective view of the exhaust inner cylinder with the exhaust pipe pulled out, and FIG. 11 is an exhaust including the exhaust inner cylinder. FIG. 12 is an external perspective view of the rear side of the cooking device according to the present embodiment.

  In the cooking chamber 4 during cooking, oil smoke or steam is generated from the food. In order to discharge it outside the machine, the internal exhaust port 30 (see FIG. 16), an exhaust duct 31 is formed substantially straight rearward, and is connected to an exhaust port 32 formed on the rear surface of the housing 2. Further, as shown in FIG. 2, when the exhaust inner cylinder lid 33 provided on the left side surface of the housing 2 is opened, the exhaust inner cylinder that can be pulled out to the left and removed as shown in FIG. A member 34 is disposed. As shown in FIG. 11, the exhaust inner cylinder member 34 has a handle 34a to be gripped when being pulled out and an inner cylinder part 34b whose inner surface is a square cylinder, and is mounted on the apparatus as shown in FIGS. In this state, the inner cylinder part 34 b fits inside the exhaust duct 31.

  That is, since the exhaust gas passes through the inner cylinder part 34b, dirt such as oil and soot contained in the exhaust gas adheres to the inner surface of the inner cylinder part 34b instead of the inner surface of the exhaust duct 31. Since the exhaust inner cylinder member 34 is detachable, the inner surface of the inner cylinder part 34b can be easily cleaned by pulling out and removing the exhaust inner cylinder member 34 as shown in FIG. In some cases, only the exhaust inner cylinder member 34 can be replaced with a new one. Thereby, the effort which cleans the inner surface of the exhaust duct 31 fixed to the heating cooking apparatus 1 itself is reduced.

  A temperature sensor 35 for detecting the exhaust temperature is attached to the apparatus 1 so as to extend in the direction in which the exhaust inner cylinder member 34 is pulled out, and this temperature sensor 35 is attached to the wall surface of the inner cylinder portion 34b of the exhaust inner cylinder member 34. An insertion hole 34c is formed. As a result, when the exhaust inner cylinder member 34 is attached to the apparatus 1, the temperature sensor 35 is inserted into the hole 34c, and the tip thereof protrudes inside the inner cylinder 34b. Accordingly, the temperature of the exhaust gas can be detected by the temperature sensor 35, and for example, abnormal heating of the food or the like in the cooking chamber 4 (for example, abnormal burning) can be detected.

  In addition, when this heating cooking apparatus 1 is installed, if sufficient space can be secured behind the rear surface of the housing 2, exhaust from the exhaust port 8 to the outside of the apparatus is easy to be performed, but if sufficient space cannot be secured, exhaust is performed. The amount may also be reduced. In such a case, an external cooling fan device can be provided. A power output terminal for supplying power to the cooling fan device is disposed on the rear surface of the housing 2. That is, as shown in FIG. 12, when the terminal lid 36 attached to the rear surface of the housing 2 with a screw is opened, the power output terminal 37 is exposed on the inside, and a power socket such as a cooling fan device is provided here. Can be plugged in.

  The power output from the power output terminal 37 is turned on / off in conjunction with the operation of the cooling fan motor of the induction heating unit cooling fan unit 52. Therefore, when the cooling fan motor of the induction heating unit cooling fan unit 52 is operated, the external cooling fan device is also operated, and when the operation of the built-in cooling fan motor is stopped, the external cooling fan device is also stopped. Can do. As a result, even when it is difficult to secure a sufficient air flow with only the built-in cooling fan, a sufficient air flow is generated in the first to third ventilation paths T1, T2, T3 and the like as described above to induce induction heating. The temperature rise of the coil 53 and the punching plate 42 can be prevented.

  Next, a container moving mechanism (container holding means in the present invention) that moves the cooking container 90 back and forth in the heating cooking apparatus 1 of the present embodiment will be described with reference to FIG. 13 (a-1) and (b-1) are top views of the bottom structure of the cooking cabinet 4 and the container moving mechanism, and FIGS. 13 (a-2) and (b-2) are taken along the line AA ′. It is side surface sectional drawing. The container moving mechanism is attached to both sides of the substantially flat container support 91 (corresponding to the container support means in the present invention) 91 in which an opening for holding the cooking container 90 is formed, and the container support. A guide rail (corresponding to the guide means in the present invention) 92 that guides in the front-rear direction while holding the left and right side edges of 91 from above and below. The container support 91 is made of an insulator such as ceramic.

  The guide rail 92 has a gentle upward inclination from the rear to the front, and the container support 91 held by the guide rail 92 is movable in the front-rear direction in a state where the guide support 92 is also inclined in the same manner. . A stopper 92a is formed at the rear end of the guide rail 92, and the position of the rearmost portion of the container support 91 is restricted by the depression 91a at the side edge of the container support 91 coming into contact with the stopper 92a. When the cooking container 90 is held by the container support 91, the bottom surface of the cooking container 90 is horizontal, that is, the top surface of the mounting plate 45 when the container support 91 is inclined as described above. ing. When the container support 91 is in the last restriction position, the bottom surface of the cooking container 90 is in contact with the top surface of the mounting plate 45. At this time, the position of the cooking container 90 is just above the induction heating coil 53. Therefore, the induction heating is most preferably performed.

  On the other hand, when the container support 91 is moved forward along the guide rail 92, the bottom surface of the cooking container 90 moves forward while being kept in a horizontal state and slightly moved upward. Therefore, the front half of the cooking container 90 jumps forward from the cooking chamber 4 and the position thereof rises, so that the food can be taken into and out of the cooking container 90 very easily. It is also easy to remove the cooking container 90 from the container support 91.

  Thus, in the heating cooking apparatus 1 of the present embodiment, the cooking container 90 is set at a position where the efficiency of induction heating becomes the best by attaching the predetermined cooking container 90 to the container support 91 and pushing it backward. can do. On the other hand, by pulling the container support 91 forward, food can be taken in and out of the cooking container 90 easily and with high safety.

  In the above description, a cooking container having a specific shape is used. However, when a pan 95 having a circular bottom is used without using the container moving mechanism, as shown in FIG. A mounting plate 45A in which a circular recess 45b is formed in the approximate center may be used.

  Further, when the container moving mechanism is used as described above, the cooking container made of metal does not come into contact with the rear wall surface or the side wall surface of the cooking chamber 4, but as shown in FIG. When the cooking container is simply placed in the cooking chamber 4, the cooking container may come into contact with the rear wall surface or the side wall surface of the cooking chamber 4. Therefore, in order to avoid this, a flat plate-like insulating member may be attached to the rear surface portion 4b, the left side surface portion 4e, and the right side surface portion 4f of the cooking chamber 4. As a specific example, FIG. 16 shows a view of the inside of the cooking cabinet 4.

  In this example, a pair of hooks 80 are provided in the vicinity of the upper corners of the rear surface portion 4b, the left side surface portion 4e, and the right side surface portion 4f of the cooking cabinet 4, and an insulating plate member 81 is hooked on the hook 80. Install. The hook 80 is made of metal or synthetic resin. On the other hand, the insulating plate member 81 can be made of a material that does not affect the microwave, for example, a glass laminated plate impregnated with silicone. Thereby, even if it puts in the position where the cooking container deviated in the cooking chamber 4, it can prevent that this container contacts the inner wall face of the cooking chamber 4 directly. Further, the insulating plate member 81 can be removed as necessary.

  The above-described embodiments are merely examples of the present invention, and it is obvious that modifications, additions, additions, and the like as appropriate within the scope of the present invention are included in the scope of the claims of the present application.

The external appearance perspective view which looked at the heat cooking apparatus by one Example of this invention from diagonally right upper. The external appearance perspective view which looked at the cooking-by-heating apparatus of a present Example from the diagonally upper left. The external appearance perspective view seen from the upper left in the state which opened the door in the heating cooking apparatus of a present Example. The schematic side surface longitudinal cross-sectional view of the heating cooking apparatus of a present Example. The assembly bottom view of the cooking chamber in the heating cooking apparatus of a present Example, and the assembly structural drawing of the induction heating unit located in the downward direction. The assembly structural drawing of the induction heating unit in the heating cooking apparatus of a present Example. The perspective view seen from the lower right direction in the state which removed the housing | casing in the heat cooking apparatus of a present Example. It is detail drawing of the mounting board in the heat cooking apparatus of a present Example, (a) is an upper surface top view, (b) is a front top view, (c) is an expanded sectional view of the A section in (b). The external appearance perspective view in the state which removed the exhaust inner cylinder cover in the heating cooking apparatus of a present Example. The external appearance perspective view in the state where the exhaust pipe was pulled out in the cooking device of this example. The perspective view of the exhaust structure containing an exhaust inner cylinder. The external appearance perspective view of the back side of the heat cooking apparatus of a present Example. It is a figure which shows the structure of the container moving mechanism in the heating cooking apparatus of a present Example, (a-1), (b-1) is a top view of a bottom structure of a cooking chamber, and a container moving mechanism, (a-2), (B-2) is a side sectional view. The perspective view which shows the modification of an upper 1st insulating member. Explanatory drawing of the structure of the mounting plate in the heat cooking apparatus of the other Example of this invention. The front top view which looked at the inside of a cooking chamber in the heating cooking apparatus of the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heat cooking apparatus 2 ... Housing 3 ... Door 3a ... Microwave leakage prevention structure 4 ... Cooking chamber 4a ... Front opening surrounding frame part 4b ... Rear surface part 4c ... Top surface part 4d ... Bottom surface part 4e ... Left side part 4f ... Right side part 6, 7 ... Outside air intake port 8, 9 ... Exhaust port 10 ... Magnetron 11 ... Waveguide 12 ... Microwave diffusion chamber 13 ... Radiation antenna 14 ... Antenna drive motor 20 ... Exhaust passage 21 ... Ventilation passage 22 ... Induction heating coil drive Inverter cooling fan 23 ... circuit box 24 ... exhaust pipe 30 ... exhaust outlet 31 ... exhaust duct 32 ... exhaust outlet 33 ... exhaust inner cylinder cover 34 ... exhaust inner cylinder member 34a ... grip 34b ... inner cylinder part 34c ... hole 35 ... temperature sensor 36 ... terminal lid 37 ... power output terminal 40 ... bottom plate 41 ... bottom plate fitting 42 ... punching plates 43, 43A, 43B ... upper first insulating member 43a ... annular part 43b ... extension piece 43c ... disc-like body 3d ... slit 44 ... upper second insulating member 44a ... opening 45, 45A ... mounting plate 45a ... peripheral edge 50 ... induction heating unit 51 ... case 51a ... intake port 51b ... exhaust port 52 ... induction heating unit cooling fan unit 53 ... Inductive heating coil 54 ... lower first insulating member 54a ... opening 54b ... notch 54c ... recessed portion 55 ... lower second insulating member 55a ... opening 55b ... recessed portion 56 ... lower third insulating member 57 ... temperature sensor 90 ... cooking vessel T1 ... 1st ventilation path T2 ... 2nd ventilation path T3 ... 3rd ventilation path

Claims (12)

Inductive heating of a box-shaped cooking chamber, high-frequency heating means including a magnetron for generating microwaves for high-frequency heating food stored in the cooking chamber, and a heating element stored in the cooking chamber An induction heating means including an induction heating coil that generates an alternating magnetic flux of
At least a part of the bottom wall surface of the cooking chamber allows the magnetic flux generated from the induction heating coil disposed below it to pass therethrough, while a large number of small holes with a predetermined diameter are perforated to prevent the passage of microwaves. Formed from materials for
On the upper part of the magnetic flux passage member is disposed a mounting plate made of an insulator capable of mounting the heating element with one or more insulating members interposed therebetween,
The one or more insulating members suppress the conduction of the heat of the mounting plate to the magnetic flux passage member and form a ventilation path for cooling the magnetic flux passage member ,
At least one of the insulating members provided on the upper side of the magnetic flux passage member integrally has a pressing portion that suppresses warpage of the magnetic flux passage member, and
Another ventilation path for cooling the magnetic flux passage member and the induction heating coil is formed by one or more insulating members provided between the magnetic flux passage member and the induction heating coil. Cooking equipment to do. Inductive heating of a box-shaped cooking chamber, high-frequency heating means including a magnetron for generating microwaves for high-frequency heating food stored in the cooking chamber, and a heating element stored in the cooking chamber An induction heating means including an induction heating coil that generates an alternating magnetic flux of
At least a part of the bottom wall surface of the cooking chamber is formed of a magnetic flux passage member that blocks the passage of microwaves while allowing the magnetic flux generated from the induction heating coil disposed below the passage to pass through.
On the upper part of the magnetic flux passage member, a placing plate made of an insulator on which the heating element can be placed with one or more upper insulating members sandwiched therebetween is disposed,
The one or more upper insulating members suppress the conduction of heat of the mounting plate to the magnetic flux passage member and form a first ventilation path for cooling the magnetic flux passage member,
The multiple lower-side insulating member provided between the magnetic flux passing member and the induction heating coil, a magnetic flux passage member between one magnetic flux passing member of the lower-side insulating member heating cooking apparatus of the second air passage for cooling, characterized in that the formation of the third air passage for cooling the induction heating coil between one said induction heating coil of the lower-side insulating member . The cooking device according to claim 1 or 2, wherein the holding portion has an elongated shape, one end thereof is supported, and the other end is opened toward the ventilation path . The cooking device according to claim 3, wherein a plurality of the pressing portions are provided radially inside the torus . The bottom wall surface of the cooking chamber is rectangular, and an air inlet for sending air to the ventilation path is provided below one corner on the front side, and the corner on the rear side located diagonally with the corner is provided. The cooking apparatus according to claim 1 or 2 , further comprising an exhaust port for discharging air that has passed through the ventilation path below . The mounting plate, in claim 1 or 2, characterized in that those increased in dielectric loss at temperatures below the temperature range of the heating element during normal heating is mainly composed of material having a characteristic that does not occur The cooking apparatus according to the description. The cooking container as the heating element is held movably in the front-rear direction, and the bottom surface of the cooking container is in contact with the mounting plate in a state where the cooking container is moved backward, and the position of the cooking container is the position of the induction heating coil. heating cooking apparatus according to claim 1 or 2, characterized in that it comprises a container holding means for moving so that the upper and. The said container holding means contains the support means which supports the said cooking container, and the guide means which guides this support means so that it may slide to the front and back, and the front rising inclination, The said Claim 7 characterized by the above-mentioned. Cooking equipment. The cooking apparatus according to claim 8 , wherein the container holding means slides the cooking container in the front-rear direction while maintaining the levelness of the bottom surface of the cooking container . The cooking apparatus according to claim 8 , wherein the container holding means has an insulating property, and the cooking container is detachable from the container holding means . An exhaust duct for discharging the air in the cooking chamber to the outside;
An inner cylinder part that is internally mounted in the exhaust duct and is removable from the outside of the housing;
The heating cooking apparatus according to claim 1 or 2, characterized by comprising : The cooking apparatus according to claim 11, further comprising temperature detection means for detecting an exhaust gas temperature protruding inside the inner cylinder part when the inner cylinder part is installed in the exhaust duct .

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