JP2007064504A - Cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain efficient deodorizing performance by accelerating the activation of a catalyst.
SOLUTION: In a heating cooker capable of cooking by supplying hot air generated by a heater 27 and a blower 26 to an object to be cooked accommodated in a cooking chamber 16, the surface of the heater 27 is activated by heating. The oxidation catalyst layer 38 to be converted is formed, and immediately after the heater is energized, the operation control is performed with the blowing capacity of the blowing device 26 lowered.
[Selection] Figure 1

Description

  The present invention relates to a cooking device provided with a so-called deodorizing catalyst capable of decomposing odor generated from an object to be cooked when cooking with hot air generated by a heater and a blower.

  In general, when cooking with an electric heater for food to be cooked (food) housed in the cooking chamber, it is caused by the cooking food being heated, or oil scattered on the inner wall surface of the cooking chamber, food bowls, etc. Odor is generated. This excessive odor is uncomfortable for the cook and people in the vicinity of the cooking device. Incidentally, as a method for suppressing such an odor, it is known to install a deodorization catalyst activated by heating at an appropriate place in a cooking chamber and oxidize and decompose the odor to suppress the generation of the odor.

  For example, FIG. 12 is a cross-sectional view schematically showing the internal configuration of the cooking device showing an example, with the cooking device body forming the outer shell removed. In this, a cooking case 2 that forms a cooking chamber 1 inside, and an air circulation path 3 is formed outside the cooking case 2. This circulation path 3 is provided with an inlet 4 as one end at the lower portion of the side wall of the cooking chamber 2 and an outlet 5 as the other end in open communication with the ceiling wall portion. The device 6 is equipped. A deodorizing catalyst 7 made of a honeycomb (or metal foam) is disposed in the vicinity of the intake port 4 on the intake side of the blower 6, while cooking is performed in the vicinity of the discharge port 5 on the blowout side of the blower 6. The heater 8 is arranged.

  According to such a configuration, the blower 6 is driven as the cooking operation (not shown) accommodated in the cooking chamber 1 starts, and the heater 8 is energized and generates heat, so that it is taken in from the intake port 4. The air flows in the direction of the arrow in the figure, is hot-aired by the heater 8 and blown into the cooking chamber 1 from the blow-out port 5, and cooking by the hot air is performed. Then, the odor generated from the object to be cooked by heating is carried on the circulating air flow and positively contacts the catalyst 7 to be deodorized, and the catalyst 7 is heated and activated in the flow of the circulating air (hot air). In order to improve the deodorizing effect.

  However, the activation of the catalyst 7 will be described with reference to the temperature characteristic diagram shown in FIG. 13. The heat activation of the catalyst 7 is an indirect heating method based on hot air circulation by the heater 8 for cooking. For this reason, the honeycomb catalyst temperature B shown in the figure only stops rising in the range until it reaches the air temperature A due to the hot air in the cooking chamber 1, and naturally the rising of the temperature is also slower than the cooking chamber air temperature A. Therefore, in FIG. 13, for example, if the activation temperature of the catalyst 7 is 250 ° C., the time point at which the catalyst 7 is activated is indicated by the symbol T1, that is, the activation time T1 after the time t1 has elapsed since the start of operation (after activation). It is possible to exert a deodorizing function during a period of time).

  On the other hand, according to the food temperature C indicating the temperature rise of the food to be cooked, odors are generated at various temperatures depending on the food material. Since it occurs earlier than the activation time T1 of the catalyst 7, after the elapse of time t0 (= t1-t2) until activation from the odor generation time T2, the deodorization action is started with a delay, and an efficient deodorization effect is obtained. I can't get it. Therefore, for example, a configuration in which a heater dedicated to activation is provided on the back side of the catalyst 7 to achieve early activation of the catalyst 7 is also conceivable. However, this method requires additional energy and is contrary to energy saving, and the dedicated heater is provided in the air circulation path 3 in the vicinity of the catalyst 7, so that a pressure loss occurs and the air blower 6 is burdened. Has a point.

In light of such background circumstances, for example, a cooking / heating heater carrying a deodorizing catalyst layer is provided near the ceiling of the cooking chamber, and a blower for circulating the air in the cooking chamber is provided to promote contact with the catalyst. In addition, a heating cooker has been proposed in which heating can be performed while efficiently deodorizing such that the heater can serve as both catalyst activation and cooking (see, for example, Patent Document 1).
Alternatively, in order to improve the performance as a deodorizing heater, a spiral fin is wound around the outer periphery of the tubular heater, and the catalyst is supported on the entire finned heater to increase the contact area with the exhaust gas, thereby deodorizing. Proposals for improving performance have been made (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 05-187644 Japanese Patent No. 3329104

  According to the configuration described in Patent Document 1 above, the contact rate between the circulating air and the catalyst is improved, and the rise of the temperature for activating the catalyst is accelerated, and the characteristic indicated by the catalyst temperature D with heater in FIG. Have. That is, the activation of the catalyst is faster at the catalyst activation time T3 (time t3) than the odor generation at the odor generation time T2 (time t3 <t2), and effective deodorization performance can be expected.

  However, the blower that actively circulates air normally performs operation control in synchronization with the power interruption of the heater. FIG. 14 is a characteristic diagram showing the relationship between the operating rate of these heaters and blowers (fans) and the catalyst temperature. As is apparent from the drawing, the air blower is activated simultaneously (indicated by symbol B as the fan operating rate) at the same time as energization of the heater (indicated by symbol A), and immediately reaches full rotation. However, immediately after the heater is energized, the catalyst temperature (indicated by symbol C) and the circulating air have not yet sufficiently increased, so that the catalyst is subjected to an air cooling action by the circulating air until the catalyst is activated. It took a long time and had disadvantages for early activation. This is indicated by the time e until activation in relation to the activation temperature d of the catalyst.

  Even if such a background situation is applied to a heating cooker as described in Patent Document 1 even if the contact area is increased by applying a catalyst to the heater as in Patent Document 2, the same problem as described above occurs. In particular, in the configuration with fins, since the contact with the circulating air is better, the influence of the air cooling action is greatly affected, and on the contrary, it takes a long time to activate. In this way, delaying the deodorizing action not only fails to obtain good deodorizing performance, but also may cause cooking to end before sufficient deodorization cannot be achieved particularly in the case of short-time cooking such as cooking. .

  In order to solve the above-described problems, an object of the present invention is to provide a cooking device in which a catalyst is applied to a heater for heating and cooking, and an air flow in contact with the catalyst is weakened immediately after the heater is energized. .

  In order to achieve the above object, a heating cooker according to the present invention supplies hot air generated by a heater and an air blower to a cooked food housed in a cooking chamber so that cooking can be performed. The main feature is that an oxidation catalyst layer that is activated by heating is formed, and immediately after the heater is energized, operation control is performed by reducing the blowing capacity of the blowing device.

  According to the above means, the catalyst can be heated and activated while serving also as a heater for cooking, so that energy saving can be promoted, and the catalyst is quickly heated up to the activation temperature and efficiently exhibits deodorization performance. In particular, at the point of time when the temperature has not yet reached a sufficient temperature rise immediately after energization of the heater, the air blowing function of the blower device is reduced to suppress the air cooling action on the catalyst layer and the necessary temperature raising action can be promoted. Thus, it is possible to provide a cooking device that can be expected to have a more efficient deodorizing performance, for example, by enabling the deodorizing function of the catalyst at an early stage.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
First, the configuration of the heating cooker will be described with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal side view showing a schematic configuration of the heating cooker, and FIG. 2 is an external perspective view in an opened state. The cooker main body 11 to be formed includes a box-shaped cooking case 12 having an open front, a door 13 provided on the left side of the front surface so as to be rotatable, a heating means, a cooking menu, etc. on the right side of the front surface. The operation panel 14 is selected and set.

  The door 13 includes a handle 15 at an upper front portion, and opens and closes an entrance which is a front opening of a cooking chamber 16 formed inside by the cooking case 12, while the operation panel 14 has various operation keys 17 and LEDs. And a display unit 18 using the In addition, although not shown in the space on the right side of the cooking chamber 16 on the back side of the operation panel 14, a machine room is configured, for example, a magnetron for microwave cooking, a high-frequency transformer, a cooling fan, and the entire cooking operation. It has a built-in control device that performs control.

  Among them, on the left and right side walls of the cooking case 2, two pairs of support portions 19a, 19a and 19b, 19b (shown only on the left side) are formed in two upper and lower stages that project inwardly and extend in the front-rear direction. ing. As shown in FIG. 1, the rectangular cooking dish 20 accommodated on the upper stage side is slidably mounted and supported, and the lower stage side is slidably supported as well. In the present embodiment, the cooking dish 20 contains a food Q such as fish as a food to be cooked. In this case, the state in which the food Q is placed using the grill net 21 is shown.

  Next, heating means for heating the cooking object in the cooking chamber 16 will be described. In addition to the above-described magnetron (not shown), for example, for the grill made of a planar heater on the outer surface side of the ceiling wall portion of the cooking case 12. A heater 22 is provided, and a hot air unit 23 for generating hot air effective for oven cooking is provided on the back wall. The hot air unit 23 includes a blower 26 including a fan 24 and a fan motor 25, a hot air heater 27 including a sheathed heater on the outer peripheral side thereof, and a casing 28 covering them. In the central part of 28, it is set as the structure provided with the suction inlet 28a and the blower outlet 28b located in the outer periphery of the said heater 27. As shown in FIG.

  In particular, the hot air heater 27 in the present embodiment is characterized by an enlarged configuration shown in FIGS. First, as is apparent from FIG. 3, the heater 27 is formed in a circular ring shape as a whole, and has a structure in which fins 29 are spirally wound around the heat generating portion (indicated by symbol E in FIG. 4). An oxidation catalyst layer 38 (details will be described later) is applied to the surface. In this case, the supported range of the catalyst layer 38 (indicated by the symbol F in FIG. 4) is within the range of the heat generating portion E. Therefore, in the state in which the heater 27 having such a configuration is incorporated as the hot air unit 23 shown in FIG. 1, the air flow (wind) generated by the hot air fan 24 arranged inward is as shown in FIG. The air flows in a direction substantially perpendicular to the direction 27 (in the direction of the arrow in the figure) and passes through the gaps between the individual fins 29 to improve the contact with air.

  However, the structure of the terminal portion of the heater 27 is, in particular, as shown in FIG. 4 in which an insulator 31 is disposed and sealed at the end of a pipe-shaped sheath tube 30 and a pin 32 serving as a conductor is welded to the terminal 33. Yes. Although the details will be described later, a spiral heater wire 34 arranged at the center portion is embedded in the sheath tube 30 through a magnesia 35 forming an insulating layer, as shown in FIG. The heater 27 is configured as a sheathed heater.

  The fin 29 is wound around the terminal side of the sheathed tube 30 from the heated portion E (see FIG. 4) and is expanded to a suitable position by welding means, and this initially straight sheathed tube is fixed. In the usage form in which 30 is formed in an annular shape, the fins 29 are configured to be directed radially. However, the fin 29 is not limited to a spiral shape, and a plurality of individual disk-like members may be arranged. Incidentally, the material of the fins 29 and the heaters 27 and hence the sheath tube 30 is a heat-resistant and corrosion-resistant alloy such as an iron-base alloy or nickel-base alloy suitable for the application. It is easy to process and is suitable for ensuring the support and fixation of the catalyst applied thereafter.

Here, with respect to the means for forming the oxidation catalyst layer 38 applied to the heater 27 and the like, a basic method for manufacturing a finned heater shown in the present embodiment (hereinafter referred to as manufacturing method 1) is mainly shown in FIG. This will be described with reference to the enlarged sectional view of FIG. FIG. 5B is a partially enlarged view indicated by reference numeral G in FIG.
(Production method 1)
First, as shown in FIG. 5A, the heater wire 34 and the magnesia 35 are inserted into the straight sheath tube 30 (step S1). The fins 29 are wound and fixed to the sheath tube 30 (step S2), and the whole is heated in an oxidizing atmosphere to form an oxide film 36 on the sheath tube 30 and the surface of the fin 29 as shown in FIG. S3). For example, when the fins 29 are made of SUS metal, a stable oxide film is not formed, and there is a concern that the catalyst supported on the oxide film 36 is insufficiently adhered and easily peeled off. According to the heat-resistant and corrosion-resistant material such as the above-mentioned iron-based alloy as in the example, an oxide film can be formed with certainty and the degree of catalyst support and fixation can be increased.

  Then, the sheath tube 30 and the fins 29 are annealed using the heat treatment for forming the oxide film 36, and formed into an annular shape as shown in the embodiment (step S4). Further, the magnesia 35 is heated and dried in a heating furnace or the like, and the terminal portion is sealed so that water does not enter (steps S5 to S6). Next, the process proceeds to step S7, and a catalyst mainly composed of palladium is supported. In this case, in order to increase the surface area as the oxidation catalyst layer 38 easily reacts with the catalyst, in this embodiment, a so-called washcoat 37 in which fine alumina powder is dispersed and supported is applied before the catalyst is supported (FIG. 5B). )reference). The palladium is excellent in heat resistance even at high temperatures, can maintain the desired deodorizing performance, and is advantageous in terms of cost.

  Subsequently, since the heat resistance in the vicinity of the sealed terminal portion is generally low, heat insulation is performed prior to the next process (step S8). For example, after taking measures such as winding a heat-resistant heat insulating member or taking it out of the heating furnace, the catalyst is fired (step S9). Thereby, with the completion of the heater 27, the oxidation catalyst layer 38 is formed on the surfaces of the heater 27 and the fins 29, and the series of manufacturing processes is completed (step S10).

  However, this kind of manufacturing process can be variously changed. For example, the manufacturing process will be described below with reference to the flowchart of FIG. Note that the same reference numerals are assigned to the same steps as those described above to simplify the description, and the same applies to other examples showing (Production Method 3) based on FIG. 8 and (Production Method 4) based on FIG. Describe in.

(Manufacturing method 2)
First, from step S1 to step S4, description of the process according to the same procedure as the above (Production Method 1) is omitted. However, steps S4 and after are different from the manufacturing process of the above (Manufacturing method 1) in that the so-called procedure of steps S7-S9-S5-S6-S10 is changed.
That is, in this example, the catalyst is loaded (step S7) and calcined (step S9) in advance, and the magnesia 35 is dried (step S5) and the terminal portion with low heat resistance is sealed (step S6). It has been moved later. According to this method, there is an advantage that the catalyst can be supported and fired in a process in which the heat insulating process in the vicinity of the terminal portion (step S8) is omitted, and the manufacturing process can be simplified accordingly.

(Manufacturing method 3)
As is apparent from FIG. 8, steps S1 to S4 are the same as those described above. However, especially in contrast to FIG. 7 of (Manufacturing Method 2) described above, in this (Manufacturing Method 3), Step T1 for simultaneously firing the catalyst and drying magnesia 35 is added after the step of supporting the catalyst in Step S7. Is different. Accordingly, the manufacturing process is one process of Step T1 with respect to the two processes of Steps S5 and S9 in the above (Production Method 2), and the manufacturing process is further simplified and the manufacturing cost can be expected to be reduced.

(Manufacturing method 4)
As shown in FIG. 9, when compared with FIG. 7 in the above (Production Method 2) having the most similar process, in this (Production Method 4), the catalyst 27 is fired by energizing the heater 27 in Step Y1. It is different in point. That is, in any of the above production methods, a heating furnace is used, but by using the heater 27 itself, the degree corresponding to the catalyst supporting portion F applied within the range of the heating portion E as shown in FIG. The heat treatment is sufficient, and the manufacturing efficiency is further improved together with the necessity of the heat insulation treatment of the terminal portion.

Next, the operation of the heating cooker provided with the heater 27 with fins 29 to which the oxidation catalyst layer 38 is applied as described above will be described.
In the cooking device shown in the present embodiment, as a general usage method, microwave cooking by a magnetron (not shown) based on setting operation of the operation panel 14 or cooking using radiant heat by the grill heater 22 is possible. Here, the case where the food Q shown in FIG. 1 is subjected to oven cooking using the hot air unit 23 will be described.

  Thus, when the cooking operation is started in a state where the food Q is accommodated in the cooking pan 20 via the grill net 21, the hot air unit 23 is operated based on a control device (not shown), and from the central portion in the cooking chamber 6. The air sucked into the suction port 28a of the casing 28 is turned into hot air by the heater 27 and blown out from the blowout port 28b on the outer peripheral side. By circulating this hot air in the direction of the arrow in the figure, the food Q is heated to perform so-called oven cooking. The hot air heater 27 and the oxidation catalyst layer 38 formed on the surfaces of the fins 29 are heated and activated by using the heaters 27 that are also used for cooking, and the surface area of the fins 29 is increased so that the contact area with the air is increased. The odor generated from the food Q is efficiently oxidatively decomposed and effectively deodorized.

More specifically, the air blower 26 is activated simultaneously with the energization of the heater 27. At the time of activation, the operation control is performed so that the operation is performed in a state where the air blowing capacity is lowered without being immediately rotated at full speed.
That is, FIG. 10 is a characteristic diagram showing the relationship between the operating rate of the heater 27 and the blower 26 and the temperature of the oxidation catalyst layer 38 applied to the heater 27 and the fins 29. (C) shows different examples of the operating means whose air blowing capacity is lowered at the time of starting and immediately before stopping the air blowing device 26. In the figure, symbol A indicates the energized state of the heater 27, symbol B indicates the fan operating rate of the blower 26, symbol C indicates the catalyst temperature characteristics, symbol D indicates the activation temperature of the catalyst, and symbol E indicates The activation time of the catalyst is shown.

  First, referring to FIG. 10A, the fins 29 and the oxidation catalyst layer 38 formed on the surfaces of the fins 29 as the heater 27 is energized are also heated and quickly raised in temperature. This is equivalent to the catalyst temperature D previously disclosed in FIG. 13, but when the fan 24 is activated with a normal blowing capacity, the cooled air still comes into contact with the catalyst layer 38, and this acts as an air cooling function. As disclosed in FIG. 14, the activation time of the catalyst layer 38 becomes longer. In this case, the larger the surface area by the fins 29, the more disadvantageous. However, the air blower 26 in this embodiment starts simultaneously with the energization of the heater 27 as shown in the fan operating rate b, but operates for a while at a low speed in the middle of reaching the full rotation, and then accelerates by normal drive control. The air volume is increased.

  Therefore, based on the operation control in which the so-called air blowing capability that is driven by the low speed rotation of the fan 24 is lowered, the contact between the oxidation catalyst layer 38 and the air immediately after the heater 27 is energized is weakened, and the temperature rise is suppressed by that much. The activation time e can be shortened, and the time can be shortened compared to the activation time e of FIG. For this reason, an effective deodorizing function can be exhibited from the beginning of heating cooking, and it is particularly suitable for the structure of the heater 27 with fins 29, and also has a deodorizing effect reliably from the early stage even in the case of short-time cooking such as cooking. I can expect. In this embodiment, one-stage low-speed rotation is used, but operation control can be performed in a plurality of stages.

  On the other hand, in heating cooking, a polymer substance such as an oil component generated from the food Q serving as an object to be cooked easily adheres to the surface of the catalyst layer 38, and the catalytic function may be gradually lowered. Therefore, in this embodiment, immediately before the heater 27 and the air blower 26 stop the disconnection, the operation in which the rotation of the fan 24 is gradually reduced is operated for a while and then the disconnection is stopped. As a result, as is clear from the characteristic curve of the catalyst temperature C shown in the figure, the catalyst temperature temporarily rises immediately before stopping (indicated by symbol a), and the polymer substance such as the oil component adhering to the catalyst layer 38 is burned out. Since it can be restored to its original catalytic function, it can be activated early in the next cooking and can exhibit the desired deodorizing function, and can be practically used for a long time.

Next, the embodiment shown in FIG. 10B will be described. In this case as well, the heater 27 and the air blower 26 are disconnected at the same time. However, when the air blower 26 is started, the fan 24 is gradually rotated and raised, and so-called operation control is performed so that the so-called rotational speed gradually increases. Accordingly, in this embodiment as well, immediately after the heater 27 is energized, the air flow is weak and the air cooling action due to the contact with the catalyst layer 38 can be suppressed, and the heating activation of the catalyst layer 38 can be promoted. Conversion time can be shortened.
On the other hand, immediately before the heater 27 and the air blower 26 stop power interruption, the air blowing capacity is lowered by gradually reducing the rotation of the fan 24. Accordingly, in this case as well, the catalyst temperature rises temporarily (indicated by symbol a), and the polymer material such as the oil component adhering to the catalyst layer 38 can be burned out to restore the original catalytic function. An effective deodorizing function can be expected.

  Then, the embodiment shown in FIG. 10 (c) will be described. This is a case where the blower device 26 is started after a period of pause from the energization of the heater 27, and its delay time (indicated by symbol b). In the initial setting, there is no air-cooling action on the oxidation catalyst layer 38, and the catalyst temperature C rises sharply and the heating activation is promoted, and then returns to the normal blowing capacity. This corresponds to the operation control in which the air blowing capacity of the air blower 26 is lowered until it is performed. Accordingly, in this embodiment, the activation time of the catalyst layer 38 can be shortened similarly to the above, and an effective deodorizing effect can be expected.

On the other hand, immediately before the heater 27 is shut off, the blower 26 is stopped prior to the heater 27. As a result, the air cooling action by the fan 24 temporarily disappears, and the temperature of the catalyst layer 38 temporarily rises (indicated by symbol a), and the polymer material such as the oil component adhering to the catalyst layer 38 is burned off, and the An effective deodorizing function similar to the above can be expected.
In addition, each operating means of FIG. 10 (a), (b), (c) which lowered the air blowing capability of the air blower 26 in relation to the power interruption of the heater 27 described above can be implemented in an appropriately exchanged combination. In addition, various modifications can be made during implementation, such as a means for lowering the blowing capacity by intermittent operation.

As described above, the present embodiment has the following effects.
Fins 29 were provided spirally on the hot-air heater 27 for cooking, and the oxidation catalyst layer 38 was supported and fixed on these surfaces. Therefore, the catalyst layer 38 is basically provided with a dedicated heating means for activation, and as a result, the time until activation basically becomes faster as shown by the catalyst temperature D shown in FIG. . Further, the structure with the fins 29 increases the surface area in contact with the air, and the air flow (hot air) generated by the fan 24 is shown in FIG. , 4 can flow along the surface of the fin 29 in the radial direction from the inside as indicated by an arrow to enhance the contact effect, and an efficient and excellent deodorizing performance can be expected.

  In addition to maintaining such basic effects, the present embodiment has excellent practical features as disclosed in FIG. That is, in the system in which air is circulated, the heater 27 and the catalyst layer 38 are promoted to come into contact with air to obtain an effective deodorizing performance, but on the heater 27 and the catalyst layer 38 that are still insufficiently heated immediately after energization. The air blow by the air blower 26 (fan 24) that reaches full rotation immediately has an adverse effect on the rapid heating activation of the catalyst layer 38 by conversely having an air cooling action.

  Therefore, in this embodiment, the air blower 26 immediately after energization of the heater 27 performs operation control with the air blowing capacity of the fan 24 lowered, thereby reducing the above-described air cooling action on the catalyst layer 38 and heating the temperature. The action was promoted to enable early activation of the catalyst. Accordingly, an effective deodorizing function by the catalyst layer 38 can be exhibited from the early stage of the start of cooking, and a sufficient deodorizing effect can be obtained even in relatively short-time cooking such as cooking. In particular, in the configuration with the fins 29 as in the present embodiment, the air cooling action before the temperature rise has a large influence, and therefore, for example, the operation control with a reduced number of revolutions at the start of the blower 26 greatly contributes to the early activation of the catalyst. It is valid.

  Further, in the practical use of the cooking device, there is a concern that a polymer substance such as an oil component adheres to the surface of the catalyst layer 38 from the food Q as the food to be cooked, and the catalytic function is gradually lowered. Immediately before the heater 27 and the air blower 26 are stopped from power interruption, the operation in which the air blowing capacity of the fan 24 is lowered is controlled to stop after operating for a while. Therefore, as apparent from FIG. 10, the catalyst temperature temporarily rises (indicated by symbol a), and the polymer material such as the oil component adhering to the catalyst layer 38 can be burned out to restore the original catalytic function. It is possible to provide a heating cooker that can be activated early in the next cooking, and that has a practical effect that can reliably exhibit the desired deodorizing function and can be used for a long time.

  The present invention is not limited to the embodiment described above and shown in the drawings. For example, the present invention is not limited to a finned heater configuration, and the heater shape is not limited to an annular shape. For example, it is formed in a U shape as shown in FIG. Various modifications can be made according to the configuration of the hot air unit. In addition, the heating cooker can be applied with various modifications without departing from the gist of the present invention, for example, as long as it is configured to include a heater and a blower and heat cook with hot air.

1 is a longitudinal side view showing a schematic configuration of a heating cooker showing an embodiment of the present invention. External perspective view with the door open Overall configuration of heater Enlarged view of the main part of the heater (A) is an enlarged cross-sectional view of the main part of the heater, (b) is an enlarged view of the part G shown in FIG. The flowchart for demonstrating the manufacturing method of the heater which forms a catalyst FIG. 6 equivalent view showing a different manufacturing method FIG. 6 equivalent view showing another different manufacturing method FIG. 6 equivalent view showing a further different manufacturing method. (A), (b), (c) is a characteristic diagram showing the relationship between the operating rate of the heater and the blower under different conditions and the catalyst temperature. 3 equivalent view showing other heater shapes Sectional drawing which shows the conventional schematic internal structure Temperature characteristics chart for catalyst activation Fig. 10 equivalent

Explanation of symbols

  In the drawing, 12 is a cooking case, 16 is a cooking chamber, 23 is a hot air unit, 24 is a fan, 26 is a blower, 27 is a heater, 29 is a fin, 30 is a sheath tube, 34 is a heater wire, 35 is magnesia, 36 Indicates an oxide film, 37 indicates a washcoat, and 38 indicates an oxidation catalyst layer.

Claims (5)

In what can be cooked by supplying hot air generated by a heater and a blower to the object to be cooked housed in the cooking chamber,
The heating cooker is characterized in that an oxidation catalyst layer that is activated by heating is formed on the surface of the heater, and immediately after the heater is energized, operation control is performed by reducing the blowing capacity of the blowing device.   2. The cooking device according to claim 1, wherein the blowing capacity of the blower immediately after energization of the heater is set to operation control in which the rotational speed is increased step by step when the blower is started.   2. The cooking device according to claim 1, wherein the blowing capacity of the blower immediately after energization of the heater is set to operation control in which the rotational speed is gradually increased at the time of activation.   The cooking device according to claim 1, wherein the blowing capacity of the blower is an operation control that starts after a period of pause after the heater is energized. The heating cooker according to any one of claims 1 to 4, wherein the blower operates for a while with a reduced blowing ability immediately before energization of the heater is stopped.

Images