JPH11108361A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectually generate a large amount of steam. SOLUTION: Water from a water feed pipe 18 is supplied to a water scattering member 30 mounted on a tip end of a rotary shaft 16 of a fan motor 16. The water scattering member 30 is adapted such that a slit shaped cutout is provided in a cylindrical hollow peripheral wall. The supplied water becomes fine water droplets through the water secttering member 30 and is scatterred to surroundings, and is then brought into collision with the fan 17, aqnd is further made fine like fog. The droplets are sent to the neighborhood of the heater 12 entrained on an air stream produced by the fan 17. The heater 12 is induction heated with an rf current flowing through the coil 13, and the fog like water droplets are instantaneously vaporized and are fed into the heating chamber 1 together with hot air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking apparatus for cooking an object to be heated such as food stored in a heating chamber.

[0002]

2. Description of the Related Art Heating and cooking devices for heating and cooking foods stored in a heating chamber include a device using dielectric heating using electromagnetic waves such as a magnetron, a device using radiant heating using hot air or the like, or a combination thereof. Those used have been developed. Further, there is also known a device in which the above-mentioned heating is performed while supplying steam into the heating chamber (for example, Japanese Patent Publication No. 59-22132, Japanese Patent Laid-Open No.
-49854, JP-A-9-4849).

FIG. 9 is a configuration diagram of a steam oven which is a conventional heating cooking device using hot air. A tray 42 for placing an object to be heated is provided inside the heating chamber 41, and a pot-shaped recess 43 for accommodating a heating unit is formed on the back surface of the inner wall of the heating chamber 41. A motor rotation shaft 45 of a fan motor 44 installed behind the concave portion 43 penetrates a rear wall of the concave portion 43, and a fan 46 is fixed to a distal end thereof. A sheathed wire heater 47 is provided around the fan 46 around the fan 46, and is supplied with electric power from a circuit (not shown) to be heated. The fan 46 has a structure in which air is sucked in from the front on the inner peripheral side and is sent out to the outer peripheral side. The sent out air comes into contact with the heater 47 and is heated to return into the heating chamber 41.

[0004] A steam generator 48 is attached to the heating chamber 41, and supplies electric power to the heater 481 to supply water to the water tank 482.
The water vapor obtained by heating and evaporating the water inside is supplied to the heating chamber 41. Steam is effective not only to prevent the food surface from drying during heating by hot air, but also to improve the heating efficiency. That is, when heating is performed while adding steam (especially superheated steam), a larger amount of heat can be given to the food from the steam that has come into contact with the food, so that the cooking time can be reduced as compared with the case where steam is not added. it can.

In the cooking device having the above-described structure, the sheathed wire heater 47 has a surface covered with a heat-resistant insulator, and it is difficult to widen the surface area structurally. Low. For this reason, if an excessive amount of electric power is supplied to the heater, the inside of the heater temporarily becomes excessively high temperature, which may cause breakage such as disconnection of a heating wire. We had to limit the maximum power.

In view of such a problem, the present inventors have proposed a heating cooking apparatus having a novel configuration in Japanese Patent Application No. 9-82139. That is, this heating cooking device has a heating chamber for accommodating an object to be heated, a substantially cylindrical bowl-shaped recess made of an insulator attached to the back of the heating chamber,
A fan provided in the recess to send air sucked from the center front to the outer peripheral side, a cylindrical heating element disposed around the outer periphery of the fan inside the concave portion, and a coil wound around the outer periphery of the concave portion. Power supply means for supplying high frequency power to the coil to inductively heat the heating element, and water supply means for supplying water near the center of the fan.

The water supplied by the water supply means collides with the wing of the fan rotating at high speed to form fine droplets. The water reaches the vicinity of the heating element by the air flow generated by the fan and is vaporized. Therefore, according to this heating cooking device, steam can be sent into the heating chamber together with the hot air.

[0008]

When cooking such as steamed food in such a heating cooking apparatus, a large amount of steam is required. However, the water droplets that have fallen from above and hit the wings of the fan and are scattered proceed in a substantially constant direction and come into contact with a specific range of the heating elements. For this reason, when a large amount of water flows, the temperature of a part of the heating element decreases, and the poured water does not completely evaporate, and part of the water flows down as water droplets. For this reason, it was necessary to limit the water injection rate to some extent or to apply a larger heating power to generate a large amount of water vapor.

In view of the above, the present invention is an improvement of the above-mentioned novel cooking device, and an object of the present invention is to provide a steam generator capable of efficiently generating a large amount of steam. To provide a heating cooking device.

[0010]

Means for Solving the Problems, Embodiments of the Invention, and Effects of the Invention The heating and cooking apparatus of the present invention made to solve the above-mentioned problems includes: a) a heating chamber for accommodating an object to be heated; b) a recess formed in communication with the heating chamber; c) a blowing means including a fan provided in the recess toward the heating chamber and for sending air sucked from the front of the center to the outer peripheral side; Heating means including a heating element disposed around the outer periphery of the fan; e) a water scattering portion provided on the rotation axis of the fan, which scatters water droplets around with the rotation; f) the water scattering portion. And a water supply means for supplying water.

[0011] In the heating and cooking apparatus of the present invention, the blowing means includes:
The air in the heating chamber is sucked in and sent out toward the heating element.
The air is heated by exchanging heat with the heating element. When water is supplied from the water supply means to the water scatter portion rotating with the fan, the water scatter portion scatters the water as small water droplets around. These minute water droplets are further miniaturized and mist-like by colliding with the fan blades rotating around the water scattering portion. The water droplets in the form of a mist travel near the heating element by the air flow, come into contact with the heating element itself or hot air near the heating element, evaporate, and are sent to the heating chamber together with the hot air.

Therefore, according to the configuration of the heating and cooking apparatus of the present invention, the water once becomes fine water droplets by the water scattering portion and then collides with the fan. It has become. For this reason, since it is easily vaporized by the heat of the heating element, it is possible to efficiently generate water vapor. Further, since water droplets are scattered on the periphery by the water scattering portion on average, water vapor can be generated using the entire heating element, and even when a relatively large amount of water is supplied, it can be completely vaporized.

[0013] In the heating and cooking apparatus according to the present invention, the heating means includes a ring-shaped metal body surrounding the outer periphery of the fan, a coil provided in the vicinity of the metal body, and a high-frequency electric power supplied to the coil. And an electric power supply means for inductively heating the metal body.

In this configuration, when the power supply means supplies high frequency power to the coil, an alternating magnetic flux passing through the inner opening of the metal body is generated in the coil. This magnetic flux induces an alternating current in the metal body in the circumferential direction, and the metal body itself is induction-heated.

Therefore, unlike the heating means using the heating wire, there is no fear that the heating wire is disconnected, so that a large heating power corresponding to the capability of the high frequency power supply can be applied to the heating means. For this reason, heating rises quickly, and steam can be generated quickly when steam is needed.

Further, the water scattering portion is provided on a rotating shaft on the back side of the wing body of the fan, and an auxiliary wing body is formed on the back side of the wing body. It is possible to adopt a configuration in which water is supplied to the water scattering portion via a water pipe arranged on the back side.

That is, for example, the water supplied through a water pipe disposed through the rear wall of the concave portion is scattered around by the water scattering portion, and collides with the auxiliary wing body surrounding the periphery. It becomes a mist. When the water pipe is disposed in front of the recess, that is, on the side of the water vapor outlet, the water vapor that has contacted the low-temperature water pipe is condensed and dew condensation occurs. However, according to the above configuration, since the water pipe is not provided in front of the concave portion, there is no possibility that such dew condensation occurs.

The water scattering portion may have a suitable structure as long as the structure is such that the supplied water is temporarily held and scattered little by little as it rotates. For example, the water scattering portion has a configuration having a slit-shaped opening along the rotation axis direction on a peripheral wall of a substantially cylindrical hollow body,
It is preferable to supply water to the inside of the hollow body. Here, when one end face of the hollow body is open, the opening includes a slit cut from the open end face.

In this configuration, the water supplied to the inside of the hollow body is adhered and held inside the peripheral wall by centrifugal force, leaks outside through the opening, and scatters around. Thereby, water droplets can be scattered all around.

In this configuration, it is preferable that one end face of the hollow body is closed and the peripheral wall is inclined so that the area of the circular cross section on the closed end face side is increased. According to this configuration, the water supplied to the inside of the hollow body moves to the closed end face side, so that the water is easily held inside the hollow body.

Further, the water scattering portion has a structure in which a projecting piece or a groove extending along the direction of the rotation axis is formed around a cylindrical rotary shaft, and water is poured from above into the water scattering portion. It can be. According to this configuration, the water poured into the water scattering portion is easily gathered around the rotating shaft by the protruding pieces or the grooves, and the water is scattered around with the rotation.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a heating and cooking apparatus according to the present invention will be described below with reference to FIGS. FIG. 1 is a schematic side sectional view showing a configuration of a main part of the heating and cooking apparatus of the present embodiment, FIG. 2 is a side view (a) and a front view (b) showing an appearance of a heating element in FIG. 1, and FIG. FIG. 2 is a side sectional view (a) and a sectional view taken along line A1-A2, showing a detailed configuration of a water scattering member in FIG.

The front opening of the box-shaped heating chamber 1 is substantially closed by a door 2, and behind the heating chamber 1,
A heating unit 10 including a heating unit, a blowing unit, and a water sending unit is provided.

The heating means includes a case 11 made of a pot-shaped insulator fixed to the rear wall 1 a of the heating chamber 1,
A heating element 12 having a substantially cylindrical shape as shown in FIG. 2 fitted in close contact with an inner peripheral wall of the casing, a coil 13 wound around an outer periphery of a case 11, and an inverter for supplying high-frequency power to the coil 13. And a high-frequency power supply unit 14 including a control circuit.

The air blowing means comprises a fan motor 15 disposed behind the case 11 and a fan 17 mounted on a rotating shaft 16 that passes through the center of the rear wall of the case 11. The fan 17 has a structure in which air sucked in from the center front is sent to the outer peripheral side of the wing body, and correspondingly, the rear wall 1a of the heating chamber 1 has an intake hole 3 formed on the inner peripheral side of the fan 17.
However, a blow hole 4 is provided on the outer peripheral side.

The water supply means comprises a water supply pipe 18 having a water outlet 19 near the center of the fan 17 and a water supply pump 20 for sending out water sucked from a water storage tank 21 to the water supply pipe 18. At the tip of the rotating shaft 16, a water scattering member 30 which is a hollow body described later is attached.
Is disposed so as to protrude into the water scattering member 30.

As shown in FIG. 3, the water scattering member 30 is
One end face (the right end face in FIG. 3) is open and the other end face is a cylindrical hollow body 31 which is closed, and four slit-like cuts 32 are formed from the open end face. The distal end of the water outlet 19 is inserted into the hollow body 31 from the open end face.

In the above configuration, when a high-frequency current is supplied from the high-frequency power supply unit 14 to the coil 13, a magnetic flux passes through the central opening of the heating element 12, and the magnetic flux causes an induction current to flow in the circumferential direction of the heating element 12. . When this induced current flows through the heating element 12, Joule heat is generated, and the heating element 1
2 itself is heated. Of course, a part of the magnetic flux penetrates the heating element 12 vertically or obliquely, thereby locally generating an eddy current. However, the entire heat generation is mainly caused by the current circulating around the heating element 12.

When the fan 17 is driven to rotate by the fan motor 15 (the rotation speed is, for example, about 2700 rpm), the air sucked into the case 11 from the heating chamber 1 through the air inlet 3 is sent to the outer peripheral side of the fan 17. The heating element 12 contacts the heating element 12 and is heated. This hot air is sent out of the outlet 4 into the heating chamber 1 and is drawn into the case 11 again through the inlet 3 through the heating chamber 1 as indicated by an arrow in FIG.

When water vapor is to be generated, water is pumped from a water storage tank 21 by a water supply pump 20 and sent out to a water supply pipe 18. As a result, water is poured from the water outlet 19 into the inside of the peripheral wall of the hollow body 31 of the water scattering member 30 rotating at the same rotation speed as the fan 17. The water adheres to the entire circumference of the inner wall of the hollow body 31 due to centrifugal force and rotates,
It leaks out from the cut 32 and is bounced off and scattered around. Since the width of the cut 32 is narrow, fine water droplets are continuously sprayed from the water scattering member 30 in all directions.
These fine water drops collide with the wings of the fan 17 and are further miniaturized into mist. And fan 17
The gas is carried to the outer peripheral side by riding on the air flow generated by the gas, and is vaporized by contacting the heating element 12 or high-temperature air near the heating element 12. The mist-like fine water droplets are diffused almost uniformly over the entire circumference of the heating element 12, so that the mist can be satisfactorily vaporized without lowering the temperature of a specific portion of the heating element 12.

The generated water vapor is discharged together with the hot air into the blowing holes 4.
From the heating chamber 1. Thereby, the heating chamber 1
It is possible to prevent drying of the food to be heated housed therein, and to efficiently apply heat by the latent heat of water vapor attached to the food surface as described above.

In the heating and cooking apparatus of this embodiment, the heating element 12
If the resistivity is low, a larger high-frequency current must be supplied in order to generate the same heating power, and the high-frequency power supply unit 14 becomes large-scale. For this reason, it is preferable that the resistivity of the metal material forming the heating element 12 be appropriately high.
In addition, not only heat resistance but also corrosion resistance is required because water vapor generated from food comes into contact with the food. Considering this, the heating element 12 is made of stainless steel,
An iron-based metal containing a large amount of nickel (for example, Inconel sold by Daido Inc.) is suitable.

Next, the structure of the water scattering unit according to another embodiment of the heating and cooking apparatus of the present invention will be described with reference to FIGS. 4 to 6, similarly to FIG. 3, a side cross-sectional view (a) showing a detailed configuration of the water scattering portion and a B1-B2 line (C1-C2 line,
(D1-D2 line) sectional view (b).

The example of FIG. 4 shows an open end face (right end face in FIG. 4).
A hollow body 33 whose peripheral wall is inclined so that its circular cross section becomes wider toward the closed end face is used, and four slit-shaped openings 34 are formed in the peripheral wall. In this configuration, since the water poured into the inside of the hollow body 33 from the water outlet 19 collects on the closed end face side, it is possible to prevent the water from overflowing from the open end face.

In the example shown in FIGS. 5 and 6, a water pipe 18 is provided above a water scattering portion provided at the tip of a cylindrical rotary shaft 16.
Is disposed, and water is poured from the water discharge port 19 to the water scattering portion. The water scattering portion shown in FIG. 5 has four projections 35 extending in the rotation axis direction around a cylindrical rotation shaft 16. The water scattering portion shown in FIG. 6 is formed by forming four grooves 36 extending in the rotation axis direction around the cylindrical rotation shaft 16. The protrusions 35 or the grooves 36 prevent the poured water from flowing down the outer periphery of the rotating shaft 16 smoothly. As a result, the water is likely to cling to the periphery of the rotating shaft 16, and the water is scattered around the rotating shaft 16.

Next, another embodiment of the cooking device of the present invention will be described with reference to FIGS. FIG. 7 is a schematic side sectional view showing a configuration of a main part of the heating and cooking apparatus of this embodiment, and FIG. 8 is a side sectional view (a) showing a detailed configuration of a water scattering section and a sectional view taken along line E1-E2 (b). It is.

In this embodiment, the water pipe 18 is
The water outlet 19 protrudes into the water scattering member 30 attached to the rotating shaft 16 on the back side of the fan 17. The fan 17 has not only a wing body 17a on the front side but also an auxiliary wing body 17b on the back side. For this reason,
When the rotation shaft 16 is rotated by the fan motor 15, the same airflow as on the front side is generated on the back side of the fan 17.

As shown in FIG. 8, the water scattering member 30 is
A slit-shaped notch 38 is formed in the peripheral wall of a flat cylindrical hollow body 37 having one end face opened and the other end face closed. When the water supplied through the water supply pipe 18 is poured into the inside of the hollow body 37 from the water outlet 19, the water is stuck and held on the inner peripheral wall of the hollow body 37 by centrifugal force, and gradually outwardly through the cut 38. Leak out. Then, it is scattered around and collides with the auxiliary wing body 17b to be further miniaturized.

According to the configuration of this embodiment, there is no need to dispose the water pipe 18 in front of the heating unit 10. Normal,
Since cold water flows through the water supply pipe 18, in the embodiment of FIG. 1, a part of the water vapor blown out from the blow-out hole 4 is cooled by the water supply pipe 18 and condensed on its wall surface, and drops as water droplets. There is fear. On the other hand, in the embodiment of FIG. 7, such dew condensation does not occur.

The above embodiment is merely an example, and it is apparent that changes and modifications can be made within the spirit of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view showing a configuration of a main part of a cooking device according to an embodiment of the present invention.

FIG. 2 is a side view (a) and a front view (b) showing the appearance of the heating element in the present embodiment.

FIGS. 3A and 3B are a side cross-sectional view and a cross-sectional view taken along line A1-A2, respectively, showing a detailed configuration of a water scattering portion in the present embodiment.

FIGS. 4A and 4B are a side sectional view and a B1-B2 line sectional view, respectively, showing a detailed configuration of a water scattering portion according to another embodiment of the present invention.

5A and 5B are a side sectional view and a sectional view taken along line C1-C2, respectively, showing a detailed configuration of a water scattering portion according to another embodiment of the present invention.

FIGS. 6A and 6B are a side sectional view and a sectional view taken along line D1-D2, respectively, showing a detailed configuration of a water scattering portion according to another embodiment of the present invention.

FIG. 7 is a schematic side sectional view showing a configuration of a main part of a heating cooking device according to another embodiment of the present invention.

8A and 8B are a side sectional view and a sectional view taken along a line E1-E2, respectively, showing a detailed configuration of a water scattering portion in the embodiment of FIG. 7;

FIG. 9 is a configuration diagram of a conventional heating cooking device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heating chamber 1a ... Rear wall 3 ... Inlet hole 4 ... Outlet hole 10 ... Heating unit 11 ... Case 12 ... Heating element 13 ... Coil 14 ... High frequency power supply unit 15 ... Fan motor 16 ... Rotating shaft 17 ... Fan 17a ... Blade body 17b ... Auxiliary wing body 18 ... Water pipe 19 ... Water outlet 20 ... Water pump 21 ... Water tank 30 ... Water scattering member 31,33,37 ... Hollow body 32,38 ... Incision 34 ... Opening 35 ... Protrusion piece 36 ... Groove

Claims (6)

[Claims] A) a heating chamber for accommodating an object to be heated; b) a recess formed in communication with the heating chamber; c) suction provided from the front of the center provided in the recess toward the heating chamber. Blowing means including a fan for sending the blown air to the outer peripheral side; d) heating means including a heating element disposed so as to surround the outer circumference of the fan; and e) a heating means provided on a rotation shaft of the fan. A heating device for supplying water to the water scattering portion; and a water supply portion for supplying water to the water scattering portion. 2. The heating means includes: a ring-shaped metal body surrounding the outer periphery of the fan; a coil provided in the vicinity of the metal body; and supplying high-frequency power to the coil to remove the metal body. 2. The heating and cooking apparatus according to claim 1, wherein the heating and cooking apparatus is constituted by power supply means for induction heating. 3. The fan according to claim 1, wherein the water scatterer is provided on a rotation shaft on a rear side of the wing of the fan, and an auxiliary wing is formed on a rear side of the wing. The heating and cooking device according to claim 1, wherein the water is supplied to the water scattering portion via a water pipe arranged on a back side. 4. The water scattering portion has a configuration in which a slit-shaped opening is provided along a rotation axis direction on a peripheral wall of a substantially cylindrical hollow body, and water is supplied into the hollow body. The cooking device according to any one of claims 1 to 3, wherein 5. The heating apparatus according to claim 4, wherein the hollow body has a structure in which one end face is closed and a peripheral wall is inclined so as to increase the area of a circular cross section on the closed end face side. Cooking equipment. 6. The water scattering portion has a configuration in which a projecting piece or a groove extending along the direction of the rotation axis is formed around a cylindrical rotary shaft, and water is poured from above onto the water scattering portion. The cooking device according to any one of claims 1 to 3, wherein