JP2003194340A - Cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily arrange catalyst and to fully perform its function, in a cooker wherein smoke and odorants are decomposed by a catalyst borne on hot air circulating in the heating chamber. <P>SOLUTION: Air is drawn into a blower 20, installed outside a heating chamber 11, out of the chamber 11 via an inlet 32 and then into an upper duct 25 and a side duct 26. The air drawn into the duct 25 is heated by an upper heater 40 and sent bank to the chamber 11 via an upper outlet 30. A catalytic block 70 is arranged in the duct 25, to be heated by catalyst heaters 73 for decomposition of smoke and odorants in the air current. A catalytic coating 74 is applied to the inner wall of the upper duct 25 for augmentation of smoke and odorant decomposing performance. The side duct 26 is similar to the upper duct 25 in structure. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker for heating an object to be cooked by a high-temperature circulating air flow formed in a heating chamber.

[0002]

2. Description of the Related Art A heating cooker, such as a convection oven or a hot air impact type oven, for heating and cooking an object to be cooked by forming a high-temperature circulating air flow in a heating chamber containing the object to be cooked is well known. It is used. In literature 6-
Examples of the hot air circulation type heating cooker can be seen in Japanese Patent No. 23841, Japanese Patent Laid-Open No. 2000-329351, and the like.
Further, an example of a hot air shock type heating cooker can be seen in Japanese Patent Publication No. 9-503334.

[0003] Here, regarding the structure that is the premise of the invention of the present application, Japanese Patent Application No. 2000-321 filed by the applicant of the present application.
The structure of the hot air circulation type heating cooker described in 291 will be described with reference to FIGS. 15 and 16.

The cooking device 1 is a rectangular parallelepiped cabinet 1.
Has 0. A rectangular parallelepiped heating chamber 11 is provided inside the cabinet 10. The ceiling wall 12 is above and below the heating chamber 11.
And a bottom wall 13, and three sides of the four circumferences are formed by a back inner side wall 14, a left inner side wall 15, and a right inner side wall 16. The other one of the four circumferences is constituted by a heat insulating door 17 that can be opened and closed. Insulation measures are also taken on the walls other than the door.

The heating chamber 11 whose six sides are surrounded by the wall and the door as described above has a height of 230 mm, a width of 408 mm, and a depth of 3.
It has an internal dimension of 45 mm. It should be noted that the numbers such as dimensions, speeds, temperatures, etc. appearing in this specification show only one preferable example, and do not limit the scope of the invention.

An air blower 20 is installed outside the inner inner side wall 14. The blower device 20 has a centrifugal fan 22 arranged in a fan casing 21, and the centrifugal fan 22 is rotated forward and backward by a reversible rotation motor (not shown). The fan casing 21 is a two-way branch type, and the upper discharge port 2
3 and the lateral discharge port 24. The upper outlet 23 is the ceiling wall 1
2 is connected to the upper duct 25 provided outside. Side discharge port 2
4 is connected to a lateral duct 26 provided outside the left inner wall 15.

The upper duct 25 and the lateral duct 26 have an upper air outlet 30 and a lateral air outlet 31 which open toward the heating chamber 11, respectively. Further, a suction port 32 of the blower 20 is provided on the inner side wall 14. The upper outlet 30 has a diameter of 11 mm
It consists of a set of cylindrical small holes, and has a side air outlet 31 and a suction port 32.
Consists of a collection of small holes with a diameter of 5 mm.

As shown in FIG. 16, an upper heater 40 is arranged in the upper duct 25. A horizontal heater 41 is arranged in the horizontal duct 26. Outside the right inner wall 16, an induction heating device 42 that assists heating by the upper heater 40 and the horizontal heater 41, and a control unit 43 that controls the operation of the entire heating cooker 1 are arranged. The outer front surface of the right inner wall 16 is an operation panel 44 for inputting instructions to the control unit 43.
(See FIG. 15).

A turntable 50 for placing an object to be cooked is arranged on the bottom wall 13. Turntable 50
A supporting means such as a grill or a two-tiered grill is placed on the top of the table according to the type of the food. Reference numeral 51 is a turntable drive motor.

The operation of the heating cooker 1 is as follows. First, open the insulation door 17 and turn the turntable 50 on the grill or 2
From the supporting means such as a corrugated grill, one suitable for the type of food is placed. The food to be cooked is placed on it or placed in a container and the heat insulating door 17 is closed.

After closing the heat insulating door 17, cooking conditions are input from the operation panel 44. The control unit 43 selects the optimum cooking method from a plurality of pre-programmed cooking methods based on the input cooking conditions. And the blower 20,
The upper heater 40, the horizontal heater 41, the dielectric heating device 42, and the turntable drive motor 51 are driven to start heating and cooking.

For example, when making roast chicken, a grill is installed on the turntable 50, and a chunk of meat is placed on it. The heat insulation door 17 is closed, and "roast chicken" is selected from the menu displayed on the operation panel 44. Then, the control unit 43 controls the blower 20, the upper heater 40, and the horizontal heater 4
1. Operate the induction heating device 42 and the turntable drive motor 51 in the "roast chicken" cooking mode.

The upper heater 40 has a power capacity of 1700 W and the lateral heater 41 has a power capacity of 1200 W, and hot air having an outlet temperature of 300 ° C. or more is blown out from the upper air outlet 30 and the horizontal air outlet 31, respectively. The wind speed from the upper outlet 30 is 6
5 km / h or more, the wind speed from the side air outlet 31 is 30 km / h
The control unit 43 controls the blower device 20 so as to be equal to or less than h. The rotation speed of the turntable 50 is 6 rpm.

[0014] In the above case, the hot air impact type heating cooking in which high speed hot air is blown to the object to be cooked is performed, and the meat mass is cooked at high speed. The temperature inside the heating chamber 11 is automatically adjusted to the set temperature input through the operation panel 44. The upper limit of the set temperature is 300 ° C.

Next, when making a sponge cake, a two-stage grill is installed on the turntable 50 and the cake dough is placed on each stage. The heat insulating door 17 is closed, and “sponge cake” is selected from the menu displayed on the operation panel 44. Then, the control unit 43 controls the blower 20 and the upper heater 4
0, lateral heater 41, dielectric heating device 42, and turntable drive motor 52 are operated in "sponge cake" cooking mode. The rotation speed of the turntable 50 remains 6 rpm.

This time, the wind velocity from the upper outlet 30 is 30 km /
Hot air of h or less is blown out, and the wind speed is 40 from the side outlet 31.
The control unit 43 controls the blower device 20 so that the hot air of less than km / h is blown out. In this case, two-stage hot air circulation type heating cooking is performed, and the cake dough placed on each stage of the two-stage grill is finished into a soft sponge cake. The hot air blown from above is slow and does not crush the bulging cake dough.

The heating cooker 1 adjusts the heat generation amount of the upper heater 40 and the horizontal heater 41 and the heating energy of the dielectric heating device 42 by adjusting the blown air flow rate ratio of the blower device 20, the air flow rate itself, and the wind speed. By doing
It can be used for various food items and various cooking methods.

[0018]

When cooking is performed in the heating cooker 1, fats and oils and odorous substances rise from the object to be cooked.
The oil and fat turns into oily smoke and pollutes the inside of the heating chamber and duct. Also, it adheres to the food to be cooked and impairs the flavor of the food to be cooked. In addition, the odorous substance may be exposed to high temperature to be deteriorated, and the deteriorated substance may adhere to the object to be cooked to impair the flavor of the object to be cooked.

Therefore, it has been conventionally proposed to decompose oil smoke and odorous substances with a catalyst. For example, Japanese Unexamined Patent Publication (Kokai) No. 4-62324 discloses a configuration in which a deodorizing catalyst and a catalyst heating means are arranged in a container for heating food. Japanese Patent Publication No. 2000-510568 describes a recirculation type cooking oven equipped with a catalytic converter.
Further, Japanese Patent Application Laid-Open No. 10-202112 describes a heating cooker in which a catalyst film is provided on the internal coating.

According to the present invention, in a heating cooker in which a catalyst is caused to act on a high-temperature air stream circulating in a heating chamber to decompose oil smoke and odorous substances, the catalyst can be easily arranged and its function can be sufficiently exhibited. It proposes a possible structure.

[0021]

In order to achieve the above object, the heating cooker of the present invention has the following constitution.

(1) A hot air outlet and a suction inlet in the heating chamber,
An air blower for forming the hot air and a heat source are provided outside the heating chamber to form a high-temperature circulating air flow in the heating chamber, and the circulating air flow guides the hot air to the outlet in a heating cooker that heats and cooks an object to be cooked. At least a part of the inner wall surface of the duct was coated with a catalyst that decomposes substances generated from the food to be cooked.

According to this structure, the substance generated from the object to be cooked is decomposed by the catalytic coating while the hot air passes through the duct.

(2) Hot air outlet and inlet in the heating chamber,
An air blower for forming the hot air and a heat source are provided outside the heating chamber to form a high-temperature circulating air flow in the heating chamber, and the circulating air flow guides the hot air to the outlet in a heating cooker that heats and cooks an object to be cooked. A catalyst block for decomposing a substance generated from the food to be cooked and a heat source for heating the catalyst block are arranged in the duct, and the catalyst block is attached to the inner wall surface of the duct at a distance from the inner wall surface of the duct. At least a portion was coated with a catalyst that decomposes substances generated from the food to be cooked.

According to this structure, the catalytic coating complements the function of the catalytic block. Substances in the air flow passing between the catalyst block and the inner wall surface of the duct can also be decomposed.

(3) In the heating cooker as described above,
The surface on which the catalyst coating was applied was an uneven surface.

According to this structure, the contact area between the catalyst coated surface and the air flow can be increased.

(4) In the heating cooker as described above,
While forming wavy unevenness on the inner wall surface of the duct,
As for the slopes forming the irregularities, the slope facing the direction in which the air flow blows is long and the slope facing the opposite direction is short.

According to this structure, the air flow can be efficiently brought into contact with the catalyst coated surface.

(5) In the heating cooker as described above,
The uneven shape was constituted by the ridge shape or groove shape formed along the air flow.

According to this structure, the contact area between the catalyst-coated surface and the air flow can be increased, and the flow velocity of the air flow does not decrease.

(6) In the heating cooker as described above,
The catalyst coating was applied to the air conditioning plate provided in the duct to adjust the air flow toward the outlet.

According to this structure, the air flow reliably contacts the catalyst coating.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a heating cooker according to the present invention will be described below with reference to FIGS. The heating cooker 1 of the first embodiment is the heating cooker 1 shown in FIGS. 15 and 16.
The structure is similar to that of the above, and only the components related to the invention are illustrated. Among the constituent elements of the heating cooker 1 of the first embodiment, the constituents common to those of the heating cooker 1 shown in FIGS. 15 and 16 are denoted by the same reference numerals as previously used, and description thereof will be omitted. The same principle is applied to the description of the second and subsequent embodiments, and the same reference numerals as those used previously are attached to the components described above, and the description thereof will be omitted unless there is a problem.

A catalyst block 70 is arranged in the upper duct 25 of the heating cooker 1. The catalyst block 70 is arranged at a position upstream of the upper duct 25.
The catalyst block 70 has a shape as shown in FIG. That is, a rectangular parallelepiped carrier block 71 having a large number of cylindrical vents 72 stacked in a honeycomb shape is provided, and a catalyst is supported on the carrier block 71. Carrier block 71
A cordierite honeycomb or a stainless steel corrugated honeycomb is used as the material. An aluminum-zinc alloy-plated steel sheet, for example, a galvalume steel sheet, or a galvalume steel sheet subjected to chromate treatment may be used as the base material of the carrier.

As the catalyst, a noble metal-based catalyst such as platinum or palladium, or a manganese-based catalyst such as MnO, MnO ₂ , or Mn perovskite is used. In order to support the catalyst on the carrier block 71, a technique such as painting or impregnation is adopted depending on the material of the carrier block 71.

The catalyst block 70 is attached to the inner wall surface of the upper duct 25 with a distance from the inner wall surface of the upper duct 25 by a metal fitting 80.

The catalyst block 70 must be used in a temperature range where the catalyst exhibits its function, and therefore the catalyst block 7
A catalyst heater is provided as a heat source for heating 0. The upper heater 40, which is the main heat source for forming hot air, also serves as the catalyst heater. In the first embodiment, the upper heater 40 is a sheathed heater, and a part of the sheathed heater is drawn around the catalyst block 70 to form a catalyst heater 73.

The catalyst block 70 is arranged so that the air flow passes through the cylindrical vent 72, that is, the longitudinal direction of the entire block is orthogonal to the air flow. The catalyst heater 73 is formed in such a manner as to sandwich the catalyst block 70 from the front and back so as to face the entire upstream surface of the catalyst block 70 arranged in this manner in the air flow to the middle or more of the downstream surface. There is.

A bent portion in the middle of the catalyst heater 73 is held by a heater holding portion 85 integrally formed with the fixture 80. The heater holding portion 85 holds the catalyst heater 73 so as not to contact the catalyst block 70.

The heat generated by the catalyst heater 73 heats not only the catalyst block 70 but also the air flow passing through the upper duct 25. The airflow heated by the catalyst heater 73 is further heated by the upper heater to obtain a desired temperature.

A catalyst coating 74 is applied to the inner wall surface of the upper duct 25 from around the downstream of the catalyst block 70. The catalyst coating 74 contains a catalyst having the same type or the same function as the catalyst supported on the catalyst block 70 in the coating film components.

The structure of the lateral duct 26 is the same as that of the upper duct 25. That is, the catalyst block and the catalyst heater are provided, and the inner wall surface is coated with the catalyst from the downstream of the catalyst block.

In FIG. 1, reference numeral 60 is an object to be cooked, and 61 is a grill for supporting the object to be cooked 60 on the turntable 50.

The operation of the heating cooker 1 of the first embodiment is as follows. When heating and cooking are started, air is sucked into the blower 20 from the heating chamber 11 and sent to the upper duct 25 and the lateral duct 26. The airflow entering the upper duct 25 is heated by the catalyst heater 73 and the upper heater 40, and becomes hot air and is blown out from the upper outlet 30. The airflow entering the lateral duct 26 is heated by the catalyst heater and the lateral heater 41, becomes hot air, and is blown out from the lateral air outlet 31.

Due to the heat generated by the catalyst heating heater 73 and the upper heater 40, the catalyst block 70 receives radiant heat from the upstream side and the downstream side, the heat carried by the hot air passing through the inside, and the heat conduction from the fixture 80 supporting the catalyst heater 73. Due to the heat transferred by the catalyst, the temperature at which the catalyst works well (310 ° C
Heated to ~ 600 ° C). The catalyst coating 74 also radiates heat from the catalyst heater 73 and the upper heater 40, and the upper duct 2
The heat carried by the hot air passing through 5 heats the catalyst to a temperature at which the catalyst functions well (200 ° C to 400 ° C). The catalyst block and the catalyst coating are similarly heated in the lateral duct 26.

The hot air blown into the heating chamber 11 heats the cooking object 60. Oil smoke and odorous substances rise from the heated cooking object 60. Oil smoke and odorous substances are mixed with hot air and sucked into the blower 20 through the suction port 32, and the upper duct 25
And sent to the lateral duct 26.

The oil smoke and odorous substances that have entered the upper duct 25 are
When passing through the catalyst block 70, it is decomposed and carbon dioxide becomes water or the like. Catalyst block 70 without being decomposed
Through the catalyst block 70 and the upper duct 2
The oil smoke and odorous substances that have passed through the gap between the inner wall surface of 5 and the inner wall surface of 5 contact the catalyst coating 74 in the course of traveling through the upper duct 25 toward the upper outlet port 30, and are decomposed. Oil smoke and odorous substances that have entered the lateral duct 26 are similarly decomposed by the catalyst block and catalyst coating.

Therefore, the hot air blown out from the upper air outlet 30 and the side air outlet 31 has a greatly reduced amount of oil smoke and odorous substances, and the food 60 is less likely to be polluted and the flavor to be spoiled. Heating chamber 11 and blower 2
There is little dirt of 0.

FIG. 4 shows a second embodiment of the heating cooker 1. Here, one of the inner wall surfaces of the upper duct 25, the heating chamber 1
The inner wall surface on the side that does not form the ceiling wall 12 of No. 1 is the uneven surface 75. Since the catalyst coating 74 is applied to the uneven surface 75, even if the plan view area is the same, the substantial area in contact with the air flow increases,
The decomposition ability of the catalyst coating 74 as a whole can be enhanced. Only the inner wall surface facing the ceiling wall 12 has an uneven surface 7
It is more preferable that the inner wall surface of the upper duct 25 has four uneven surfaces instead of 5, and catalyst coating is applied thereto. The inner wall surface of the lateral duct 26 also has the same uneven surface, and catalytic coating is applied thereto.

In forming the uneven surface 75, there are methods such as providing a large number of dimples on the inner wall surface of the duct, or sticking a punching plate or a lath plate.

FIG. 5 and FIG. 6 show a third embodiment of the heating cooker 1. Here, the uneven shape of the inner wall surface of the upper duct 25 is as follows. That is, the uneven surface 75 has a wavy unevenness composed of a slope 75a directed in the direction in which the air flow blows and a slope 75b directed in the opposite direction. Slope 75a
When comparing the length L ₁ of L and the length L _{2 of the} slope 75b,
₁ is long and L ₂ is short. Since the slope 75a on the side where the air flow collides is long, the decomposition ability of the catalyst coating 74 as a whole is further enhanced. The inner wall surface of the upper duct 25 can have the same uneven surface 75 on all four surfaces. A similar structure can be applied to the inner wall surface of the lateral duct 26.

FIG. 7 and FIG. 8 show a fourth embodiment of the heating cooker 1. In the heating cooker 1 of the fourth embodiment, in order to increase the area of the catalyst coated surface, a ridge shape or a groove shape is formed in the upper duct 25 along the air flow. For this purpose, a corrugated plate 76 is fixed to the inner wall surface of the upper duct 25.
The corrugated plate 76 has a cross-sectional shape shown in FIG. 8 and has grooves 76b between the triangular ridges 76a. The groove 76b
Are formed on both sides of the corrugated plate 76.

The corrugated plate 76 is made of metal, and its both surfaces are coated with a catalyst. Then, the inner wall surface of the upper duct 25 downstream of the catalyst block 70 is also coated with a catalyst, and the catalyst-coated corrugated plate 76 is fixed to the inner wall surface by a method such as screwing.

According to this structure, the area of the catalyst-coated surface is increased and the flow velocity of the airflow does not decrease because the ridges 76a or the grooves 76b are along the airflow. Therefore, it is possible to contact the catalyst coating while blowing the hot air efficiently. The lateral duct 26 also has a similar structure.

FIG. 9 shows a fifth embodiment of the heating cooker 1. Here, instead of the corrugated plate 76, an extruded material 77 having a large number of parallel fins 77a is used. Fin 77a
A groove 77b through which the air flow passes is formed between them. The extruded material 77 is made of metal and is fixed to the inner wall surface of the upper duct 25 downstream of the catalyst block 70 by a method such as screwing. Then, catalytic coating is applied to the inner wall surface of the upper duct 25 so as to include the extruded material 77.

This structure also increases the area of the catalyst coating surface, and since the fins 77a and the grooves 77b between them are in line with the air flow, the flow velocity of the air flow does not decrease, and the hot air can be efficiently blown to the catalyst coating. Can be contacted. The lateral duct 26 also has a similar structure.

FIG. 10 shows a sixth embodiment of the heating cooker 1. In the heating cooker 1 of the sixth embodiment, an air conditioning plate 78 is provided in the upper duct 25 for adjusting the air flow while directing the air flow toward the upper air outlet 30. This air conditioning plate 7
The catalyst coating 74 is applied to the inner wall surface of the upper duct 25 so as to include 8.

With this structure as well, the area of the catalyst coating surface is increased, and the air flow surely contacts the air conditioning plate 78, so that the catalyst coating 74 functions reliably. The lateral duct 26 also has a similar structure.

11 and 12 show the seventh embodiment of the heating cooker 1. The seventh embodiment is an improvement of the structure of the lateral duct 26, and can be implemented based on any of the above-described embodiments.

Oil smoke containing oils and fats and odorous substances rising from the object to be cooked 60 flows through the lateral duct 26. 60 to be cooked
Depending on the type, a large amount of oil smoke is generated. If the amount of oily smoke is too large, the oil that could not be completely decomposed by the catalyst will become
Stains the inner surface of the and collects toward the bottom of the lateral duct 26. Even when the heating cooker 1 is used for a long period of time, oil gradually accumulates.

Therefore, the bottom surface 26a of the lateral duct 26 is inclined so that the heating chamber 11 is lower. On the left inner wall 15 of the heating chamber 11, a plurality of oil drain holes 110 communicating with the lowest part of the bottom surface 26a are formed in a line along the depth direction of the lateral duct 26 at predetermined intervals.

According to this structure, the oil that has descended to the bottom of the lateral duct 26 travels along the inclined bottom surface 26a and the oil drain hole 110.
To flow into the heating chamber 11. The oil flowing into the heating chamber 11 can be easily wiped off and treated. Side duct 2
Since oil does not remain on the surface coated with the catalyst in No. 6, the effect of the catalyst coating is maintained without lowering.

FIG. 13 shows an eighth embodiment of the heating cooker 1. The eighth embodiment is a modification of the seventh embodiment. Here, a rectangular opening 111 communicating with the bottom of the lateral duct 26 is formed in the front of the heating cooker 1. A drawer type tray 112 is inserted into the lateral duct 26 through the opening 111. The saucer 112 is open toward the heating chamber 11, and the bottom surface 113 thereof is inclined so that the heating chamber 11 is lower. A plurality of oil drain holes 110 communicating with the lowest portion of the bottom surface 113 are formed in the left inner wall 15 of the heating chamber 11 so as to be arranged at predetermined intervals along the depth direction of the lateral duct 26.

According to this structure, the oil that has descended to the bottom of the lateral duct 26 flows out from the oil drain hole 110 into the heating chamber 11 along the inclined bottom surface 113 of the tray 112. The oil flowing into the heating chamber 11 can be easily wiped off and treated. Since no oil remains on the catalyst coated surface in the lateral duct 26, the effect of catalyst coating continues without lowering.

When the saucer 112 becomes dirty, the knob 114 attached to the front surface of the saucer 112 is pinched and the saucer 112 is pulled out. Then, after the dirt is removed with a detergent or the like, it is set again on the bottom of the lateral duct 26.

FIG. 14 shows a ninth embodiment of the heating cooker 1. The ninth embodiment is a modification of the structure of the tray 112 of the eighth embodiment. That is, the saucer 112 of the ninth embodiment
Collects oil in the gutter-shaped oil reservoir 115. Therefore, heating chamber 1
There is no oil drain hole in the left inner wall 15 of No. 1. When oil is collected in the oil reservoir 115, a knob 114 attached to the front of the tray 112
Squeeze out the saucer 112 to drain the oil. Then, after the dirt is removed with a detergent or the like, it is set again on the bottom of the lateral duct 26.

The internal shape of the lateral duct 26 or the shape of the catalyst coated surface may be devised so that oil easily collects in the receiving tray 112. This also applies to the eighth embodiment.

The above-mentioned oil treatment mechanism has the upper duct 2
5 can also be provided. When the oil is to be poured into the heating chamber 11, the bottom surface of the upper duct 25 is inclined as follows. That is, it is inclined in a one-way manner toward any of the inner back wall 14, the left inner wall 15, and the right inner wall 16.
Alternatively, like the gable roof, the left inner wall 15 and the right inner wall 16
Tilt towards both. Alternatively, like a hipped roof, the inner wall 14, the left inner wall 15, and the right inner wall 16 are inclined toward three directions. In any case, the oil drain holes are provided near the inner wall 14, the left inner wall 15, and the right inner wall 16 to prevent oil from dripping on the food 60 to be cooked. It is also necessary to consider that oil does not enter the blower 20.

Further, the saucer 1 of the eighth or ninth embodiment
A saucer such as 12 may be provided for the upper duct 25.

The upper duct 25 or the lateral duct 26
When the saucer is provided in, the installation position of the saucer and the shape or mounting structure of the heat insulating door 17 should be taken into consideration so that the saucer can be pulled out by opening the heat insulating door 17.

In the various embodiments of the present invention introduced above,
A catalytic coating was applied to the inner wall surface of the duct that passes hot air to heat the food to be cooked, so to speak, which constitutes the main circulation path, but it does not mainly aim to heat the food to be decomposed into oil smoke and odorous substances. As a main purpose, a sub-circulation path for circulating the air in the heating chamber may be provided, and catalytic coating may be applied to the inner wall surface of the duct forming the sub-circulation path.

The catalyst block and the catalyst coating may not be used together, but only one catalyst coating may be used.

In addition to the above, various modifications can be made without departing from the scope of the invention.

[0075]

The present invention has the following effects.

(1) Hot air outlet and inlet in the heating chamber,
An air blower for forming the hot air and a heat source are provided outside the heating chamber to form a high-temperature circulating air flow in the heating chamber, and the circulating air flow guides the hot air to the outlet in a heating cooker that heats and cooks an object to be cooked. Since at least a part of the inner wall surface of the duct is coated with a catalyst that decomposes the substance generated from the object to be cooked, the substance generated from the object to be cooked is decomposed by the catalyst coating while hot air passes through the duct. Even if the catalyst installation area is limited, the contact area between the catalyst and the air flow can be secured by utilizing the inner wall surface of the duct.

(2) A hot air outlet and a suction inlet in the heating chamber,
An air blower for forming the hot air and a heat source are provided outside the heating chamber to form a high-temperature circulating air flow in the heating chamber, and the circulating air flow guides the hot air to the outlet in a heating cooker that heats and cooks an object to be cooked. A catalyst block for decomposing a substance generated from the food to be cooked and a heat source for heating the catalyst block are arranged in the duct, and the catalyst block is attached to the inner wall surface of the duct at a distance from the inner wall surface of the duct. Since at least a part of the catalyst is coated with a catalyst that decomposes substances generated from the food to be cooked, a high level of decomposition is performed with the catalyst coating complementing the function of the catalyst block.

When the catalyst block is installed so as to completely block the duct, the ventilation resistance of the duct increases, and the air volume of the hot air decreases, or if it is intended to maintain the air volume, the blower 20 of higher performance is provided. However, this is not the case if the structure is such that a gap is formed between the catalyst block and the inner wall surface of the duct. Even if the airflow passes through the gap between the catalyst block and the inner wall surface of the duct as described above, the substance in the airflow is decomposed by the catalyst coating on the inner wall surface of the duct, so that a high level of decomposition performance can be secured.

(3) In the heating cooker as described above,
Since the surface on which the catalyst coating is applied is an uneven surface, the contact area between the catalyst coating surface and the air flow can be increased, and the decomposition performance is further improved.

(4) In the heating cooker as described above,
While forming wavy unevenness on the inner wall surface of the duct,
The slope forming the unevenness has a long slope facing the direction in which the air flow blows, and a short slope facing in the opposite direction, so that the air flow can efficiently contact the catalyst-coated surface and the decomposition performance is improved. Improve further.

(5) In the heating cooker as described above,
Since the uneven shape is formed by the ridge shape or groove shape formed along the airflow, the contact area between the catalyst coated surface and the airflow can be increased, and the airflow velocity does not decrease. Therefore, a high level of decomposition performance can be secured even if the volume of hot air is large.

(6) In the heating cooker as described above,
Since the catalyst coating is applied to the air flow control plate provided in the duct to adjust the airflow toward the outlet, the airflow can surely come into contact with the catalyst coating, and the function of the catalyst can be reliably exhibited.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing a first embodiment of a heating cooker according to the present invention.

FIG. 2 is a schematic horizontal sectional view of the heating cooker according to the first embodiment.

FIG. 3 is a perspective view of a catalyst block and a catalyst heater.

FIG. 4 is a partial vertical sectional view showing a second embodiment of the heating cooker according to the present invention.

FIG. 5 is a partial vertical sectional view showing a third improved embodiment of the heating cooker according to the present invention.

FIG. 6 is an enlarged view of a portion surrounded by an ellipse A in FIG.

FIG. 7 is a schematic horizontal sectional view showing a fourth embodiment of the heating cooker according to the present invention.

FIG. 8 is a partial cross-sectional view taken along the line BB of FIG.

FIG. 9 is a view showing a fifth embodiment of the heating cooker according to the present invention.
Partial cross-section similar to

FIG. 10 is a schematic vertical sectional view showing a sixth embodiment of the heating cooker of the present invention.

FIG. 11 is a front view showing a seventh embodiment of the heating cooker of the present invention, which is expressed by a perspective view method.

FIG. 12 is a vertical sectional view of the heating cooker according to the seventh embodiment.

FIG. 13 is a perspective view of essential parts showing an eighth embodiment of the heating cooker according to the present invention.

FIG. 14 is a perspective view of essential parts showing a ninth embodiment of the heating cooker according to the present invention.

FIG. 15 is a front view of the inside of a conventional heating cooker, which is expressed by a perspective drawing method.

FIG. 16 is a vertical sectional view of the conventional heating cooker.

[Explanation of symbols]

1 cooker 11 heating chamber 25 Upper duct 26 Side duct 30 Upper outlet 31 Side outlet 32 Suction port 40 Upper heater 41 Horizontal heater 60 Cooked 61 grill 70 catalyst block 73 Catalyst heating heater 74 Catalyst coating 75 Uneven surface 76 corrugated board 76a ridge 76b groove 77 Extruded material 77a fin 77b groove 78 Air conditioning board 110 oil drain hole 112 saucer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Torusuke Arita             22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka             Inside the company

Claims (6)

[Claims] 1. A hot air outlet and a suction port are provided in the heating chamber, and a blower and a heat source for forming the hot air are provided outside the heating chamber to form a high-temperature circulating air flow in the heating chamber. A heating cooker for performing heating cooking, wherein at least a part of an inner wall surface of a duct that guides hot air to the air outlet is coated with a catalyst that decomposes a substance generated from the object to be cooked. . 2. A hot air outlet and a suction port are provided in the heating chamber, and a blower and a heat source for forming the hot air are provided outside the heating chamber to form a high-temperature circulating air flow in the heating chamber. In a heating cooker that performs heating and cooking, a catalyst block that decomposes substances generated from the object to be cooked and a heat source that heats the catalyst block are arranged in a duct that guides hot air to the outlet, and the catalyst block is a duct. A heating cooker characterized in that it is attached in such a manner as to be spaced from the inner wall surface, and at least a part of the inner wall surface of the duct is coated with a catalyst that decomposes substances generated from the food to be cooked. 3. The heating cooker according to claim 1, wherein the surface on which the catalyst coating is applied is an uneven surface. 4. The corrugated unevenness is formed on the inner wall surface of the duct, and the slope forming the unevenness has a long slope facing the direction in which the air flow blows and a short slope facing the opposite direction. The cooking device according to claim 3, wherein the cooking device is a cooker. 5. The cooking device according to claim 3, wherein the uneven shape is formed by a ridge shape or a groove shape formed along the air flow. 6. The heating cooker according to claim 1, wherein the air conditioner provided inside the duct is coated with the catalyst to adjust the air flow toward the air outlet.