JP2009058185A - Steam generator and heating cooker using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To heighten steam generation efficiency by enlarging the contact area with water on a heated steam generating surface generating steam in the case of supplying water into the interior of a steam generating chamber. <P>SOLUTION: A heating container 13a is formed of thermal conductive material and has a closed internal space BM whose at least one wall surface is provided with a steam generating surface. The steam generating surface 41a of the heating container 13a is heated by a heating unit 13b and installed with the steam generating surface 41a tilted vertically or obliquely. In the steam generating surface 41a, a plurality of heat exchange fins 46, 47 are formed at spaces in a body at a portion below a water injection position, and when the water supplied from the outside of the heating container 13a is lowered by itself, heat is given by the heat exchange fins 46, 47 as well. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a steam generator used in a heating cooker such as a microwave oven that supplies steam to a cooking object in a heating chamber, and a heating cooker using the steam generator.

In addition to high-frequency heating and radiant heat heating using an electric heater, the conventional cooking device has a steam supply mechanism that supplies high-temperature steam, supplies high-temperature steam into the heating chamber, and enables cooking using the high-temperature steam. There is something (generally a type of cooker called a steam oven).
The steam supply mechanism supplies water from a water storage tank detachably attached to the heating cooker body to the steam generation means by a water supply means via a water supply path arranged in the heating cooker body. Water is heated and the generated steam is evaporated and diffused into the heating chamber.

The steam supply mechanism heats the wall surface of the sealed steam generation chamber from the outside with an electric heater (heating element), supplies water to the inside of the steam generation chamber with a water supply pipe or the like, and the supplied water is It is made to become water vapor by contacting a wall surface heated to a high temperature by a heating element (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2006-349313 (5th page, FIG. 4)

  In a conventional cooking device, a water supply port connected to the end of the water supply pipe is formed on the wall surface of the steam generation chamber, and a small amount of water is injected from this water supply port into the steam generation chamber. The entire wall surface between the mouth and the steam generation surface heated by the electric heater has a flat shape without irregularities. For this reason, the water injected from the water supply port is vaporized by receiving heat from the steam generation surface in the process of naturally flowing downward by gravity, but the contact area between the water and the steam generation surface is not large, There was a problem that the steam generation efficiency was not high.

  Furthermore, a temperature detector such as a thermistor is attached to the outside of the steam generation chamber for the purpose of quickly detecting the wall temperature of the steam generation chamber and accurately controlling the energization of the electric heater. If water cannot be efficiently heated and generated on the steam generation surface, it means that the temperature detector cannot quickly detect changes in the vaporization state of the water. There was also a concern that proper temperature control could not be performed.

  The present invention has been made to solve the above problems, and provides a steam generator capable of efficiently generating steam with a simple configuration and a cooking device using the steam generator. For the purpose.

  A steam generator according to the present invention includes a heating container formed of a heat conductive material having a sealed internal space and a steam generation surface provided on at least one wall surface forming the space, and the heating container A heating element that heats water supplied to the steam generating surface from the outside to generate steam, and the heating container is installed so that the steam generating surface is in a vertical or obliquely inclined state, and the steam On the generating surface, a plurality of protruding heat exchange fins are formed integrally with each other at intervals so as to prevent water supplied from the outside of the heating container from falling by itself.

The heating cooker according to the present invention is
Heat cooking comprising a heating chamber for storing an object to be heated, heating means for heating the object to be heated, steam generating means for supplying steam to the heating chamber, and supply means for supplying water to the steam generating means In the vessel
The steam generating means includes
A heating vessel having a sealed internal space and provided with a steam generating surface that is perpendicular or obliquely inclined to at least one wall surface forming the space;
A water supply pipe for supplying water from the supply means toward the steam generation surface of the container;
A heating element for heating the vapor generating surface,
The water supplied on the steam generation surface from the water supply pipe is configured to vaporize by receiving heat from the heating element in the process of flowing down the steam generation surface,
Protruding heat exchange fins are spaced apart from each other on the steam generating surface so as to prevent water supplied from the water supply pipe from descending at least in a region below the corresponding portion with the water supply pipe. A plurality of them are formed.

  The steam generator of the present invention includes a heating container formed of a heat conductive material having a sealed internal space and a steam generation surface provided on at least one wall surface forming the space, and the heating container. A heating element that heats water supplied to the steam generation surface from the outside to generate steam, and the heating container is installed so that the steam generation surface is in a vertical or inclined state, and the steam generation Since the surface is formed with a plurality of protrusion-like heat exchange fins spaced apart from each other so as to prevent water supplied from the outside of the heating container from falling by itself, The heat exchange area is expanded by the replacement fin, and there is an effect that steam can be efficiently generated with a simple configuration.

  The heating cooker according to the present invention includes a heating chamber that accommodates an object to be heated, a heating unit that heats the object to be heated, a steam generation unit that supplies steam to the heating chamber, and water that supplies the steam generation unit. In the heating cooker provided with the supply means, the steam generating means has a sealed internal space and is provided with a steam generating surface that is inclined perpendicularly or obliquely to at least one wall surface forming the space. A container, a water supply pipe that supplies water from the supply means toward the steam generation surface of the container, and a heating element that heats the steam generation surface, and is supplied from the water supply pipe onto the steam generation surface The generated water is vaporized by receiving heat from the heating element in the process of flowing down the steam generating surface, and the steam generating surface is at least in a region below the corresponding portion with the water supply pipe. Supplied from the water supply pipe Since a plurality of protruding heat exchange fins are formed at intervals from each other so as to prevent water from descending by itself, the heat exchange area is expanded by the heat exchange fins, and the structure is simple. There is an effect that it is possible to efficiently generate steam, but there is an effect that it is possible to provide an efficient cooker capable of generating a sufficient amount of steam with less power consumption.

Embodiment 1 FIG.
1 is a side cross-sectional view of the cooking device showing the first embodiment of the present invention as viewed from the left side, FIG. 2 is a cross-sectional view of the right side of the heating cooking device, and FIG. FIG. 4 is a perspective view of a water storage tank of the heating cooker, FIG. 5 is an exploded perspective view of a heating container of the steam generating means, and FIG. 6 is a lid of the heating container. 7 is a side view of the heating container, FIG. 8 is a side view of the heating container opposite to the heating container, FIG. 9 is a side view of the heating container, and FIG. 10 is the heating container. The side view in the state which removed the cover of FIG. 11, FIG. 11 is the opposite side view of the heating container, and has shown the position of the heat generating body with the broken line. FIG. 12 is a cross-sectional view when the heating container is cut vertically at the center, and hatching of a partial cross-section is omitted. FIG. 13 is a cross-sectional view when the heating container is cut horizontally at a position where the temperature detection unit is located.

  A main body 1 of a heating cooker according to Embodiment 1 of the present invention mounts a heating chamber 2 that houses a heated object 4 such as food to be cooked, and a heated object 4 provided on the bottom surface of the heating chamber 2. The mounting plate 3, the hot air circulating means 5 that circulates and heats the hot air that is the heating means for heating the object 4 accommodated in the heating chamber 2, the magnetron 6 that radiates and heats the microwave, and the microwave is guided. It comprises a waveguide 7, a rotating antenna 8, an antenna motor 9, and the like.

  Since the magnetron 6, the waveguide 7, the rotating antenna 8, the antenna motor 9 and the like are already known, detailed description thereof will be omitted, but these components are shown in the heating chamber 2 and the main body 1 as shown in the figure. It is arrange | positioned in the machine room 30 between the bottom surfaces.

  The hot air circulation means 5 used for oven cooking constitutes hot air supply means. The fan case 5a, the air blowing means 10 such as a fan rotatably provided at the substantially center in the fan case 5a, and the air blowing. Heating means 12 such as a heater provided on the outer periphery of the means 10, that is, on the outflow side of the air flow, a heat shield plate 5b provided on the outside of the fan case 5a, and a fan attached to the approximate center of the heat shield plate 5b The hot air circulation means 5 is arranged on the back surface of the main body 1.

The rear plate 2a of the heating chamber 2 is provided with a plurality of punching holes 2b and blowout holes 2c. The suction hole 2b is provided at a position facing the substantially central portion of the blowing means 10, and the blowout holes 2 c is provided at a position facing the heating means 12.
A door 26 that can be opened and closed is provided in front of the main body 1 for taking in and out the article 4 to be heated.
The heating cooker according to the first embodiment is a so-called turntableless type microwave oven that does not have a rotating table in the center of the heating chamber 2.

  Reference numeral 13 denotes steam generating means, a temperature detector 31 (such as a thermistor connected to a container 13a to which water is supplied, a heater 13b for heating the container 13a, and an energization control circuit (not shown) for the heater. These are arranged on the side of the hot air circulation means 5.

The container 13a is made of an aluminum material such as aluminum die-casting or a metal material that is not easily rusted such as stainless steel, and the electric heater 13b having a rated power of 530 W is made of a sheathed heater or the like embedded in the meat part of the container 13a. However, the container 13a and the heater 13b are not necessarily limited to these configurations. The container 13a preferably has a small heat capacity in order to shorten the heating time, and the container 13a and the heater 13b are limited to this specification and numerical values. There is no need, and the container 13a and the heater 13b may each be divided into a plurality of pieces.
Moreover, if the outer wall of the steam generation means 13 is covered with a heat insulating material to suppress heat dissipation to the surroundings, the temperature rise time is shortened, leading to improved heating efficiency / energy saving.

The supply of water to the container 13a is performed by the first water supply line 16 connecting the water storage tank 14 and the pump 15 which is water supply means, and the second water supply line connecting the pump 15 and the steam generating means 13. The operation is carried out by operating the pump 15 via 17. The water supplied to the steam generating means 13 is preferably tap water or the like containing some chlorine components in view of hygiene.
The water supplied to the steam generating means 13 is stored in the container 13 a of the steam generating means 13, heated by the heater 13 b to evaporate into steam, and steam provided on the rear plate 2 a so as to face the steam generating means 13. It is supplied into the heating chamber 2 from the blower outlet 13c.

As shown in FIG. 3, the main body 1 has a soot receiving portion 21 for receiving condensed water from the main body 1 on the right side of the main body 1 as shown in FIG. A soup / tank receiving member 20 having an open upper surface having a tank receiving portion 22 is detachably provided.
A water storage tank 14 is detachably provided in a tank receiving portion 22 of the soup / tank receiving member 20. The water storage tank 14 is composed of an elongated tank container 14a and an upper lid 14b that covers the entire upper surface of the tank container 14a so as to be freely opened and closed.

A water supply port 14c for replenishing water is provided on one end side of the upper cover 14b of the water storage tank 14, and a lid 14d that slides to close the water supply port 14c is provided.
On the other end side of the upper lid 14b, a water supply pipe 19 is provided integrally with the lid 14b.

  The water inlet 19a at one end of the water supply pipe 19 facing the water storage tank 14 is located close to the bottom surface of the tank container 14a when the upper cover 14b is covered with the tank container 14a, and the pump 15 sucks water in the tank container 14a. To be able to.

  Since the water inlet 19a in the lower end surface of the water supply pipe 19 has a notch (not shown) continuous from the edge at a part of the edge of the end surface, when the water in the tank container 14a is sucked out by the pump 15, Even when the water suction port 19a comes into contact with the bottom surface of the tank 14, the entire lower end surface of the water suction port 19a is blocked so that water cannot be sucked out.

  Further, when the water storage tank 14 is attached to the tank receiving portion 22, the outlet 19 b at one end of the water supply pipe 19 and the end of the first water supply pipe 16 are connected in a watertight state at the joint portion 29. A concave water receiving portion 23 connected to the soup / tank receiving member 20 is provided below the joint portion 29.

  Considering that water in the first water supply pipe 16 leaks out when the first water supply pipe 16 is detached from the joint part 29, in order to discharge this water leak to the water receiving part 23, A groove-shaped channel 24 is provided in the bottom plate of the main body 1 on the lower side of the portion 29, and a hole 25 is provided at the end of the channel-shaped channel 24 as shown in FIG. It can be stored in the concave water receiving portion 23 provided continuously to the member 20, and water leakage to the floor surface can be prevented.

Further, the water storage tank 14 is detachably provided by being inserted into a tank receiving portion 22 of a soup / tank receiving member 20 detachably provided at the lower front of the main body 1 so that it can be easily taken out from the front of the main body 1. Yes.
When the water storage tank 14 is attached to the tank receiving portion 22 of the soup / tank receiving member 20 and attached to the main body 1, the front of the water storage tank 14 is designed so that there is no sense of incongruity in design when viewed from the front of the main body 1. A cover 27a is provided. A cover 27b is also provided on the front surface of the soup receiving portion 21 of the soup / tank receiving member 20 so that the design 1 does not cause a sense of incongruity when viewed from the front of the main body 1.

A water level confirmation window 28 is provided at the left end of the cover 27 of the water storage tank 14 when viewed from the front of the main body 1 so that the water level can be easily confirmed when viewed from the front of the main body 1. Since the water storage tank 14 is formed of a transparent material, the water level of the water storage tank 14 can be easily seen through the water level confirmation window 28 from the outside when water is poured into the water storage tank 14.
Further, the lid 14b of the water storage tank 14 is provided with an air hole 14f in the vicinity of the water supply pipe 19, and when the water in the water storage tank 14 is sucked out by the operation of the pump 15, the air hole 14f enters the tank 14 from the air hole 14f. Air is flowing in.

  The steam generator which is the steam generating means 13 is configured as follows. 13a is a heating container to which water is supplied as described above. This heating container has an oval outer shape, an opening 32 is formed on one side surface thereof, and a wall surface 33 opposite to the opening 32 is illustrated in FIG. 1 is installed vertically (longitudinal) so as to be in close contact with the rear plate 2a of the heating chamber 2 shown in FIG.

  Reference numeral 34 denotes three through holes formed so as to penetrate the wall surface 33, and these holes communicate with the steam outlet 13c of the rear plate 2a in an airtight state. Similarly to the container 13a, an oblong lid made of an aluminum material such as an aluminum die cast or a metal material that does not easily rust such as a stainless steel is attached so as to completely close the opening 32 of the heating container 13a. It has been. That is, the lid 35 is attached in close contact with the heating container 13a by tightening a total of six screws 37 to screw seats 36 formed in a total of six locations on the outer periphery of the heating container 13a.

  The heater 13b for heating the container 13a is bent into a U shape as shown in FIGS. 5, 6, and 7, and is integrally cast into the container 13a. Two terminal portions 13c are formed from the container 13a. It is installed so that it may be on the top.

  Reference numeral 38 denotes a cylindrical water supply port formed integrally with the central portion of the lid body 35. The second water supply pipe 17 is connected to the outside of the water supply port 17, and the water in the water storage tank 14 is supplied from the electric pump 15 to the second water supply water. It is supplied via a pipe line 17.

  BM is a sealed space formed inside the container 13a by the heating container 13a and the lid 35, and this space becomes a steam generation chamber. In addition, the horizontal width of this steam generation chamber is set to about 24 mm, and the opposing space | interval of the cover body 35 and the wall surface 33, ie, height, is set to about 10 mm.

  Reference numeral 40 denotes an annular groove 40 formed in the periphery of the opening 32 of the heating container 13a. A seal member 39 made of ring-shaped silicon rubber or the like is inserted into the groove 40 and pressed by the lid 35. The high airtightness of the sealed space BM is maintained.

  In FIG. 10, reference numeral 41 denotes a steam generation surface heated by the heater 13 b. The first steam generation surface 41 a which is the inner surface of the wall surface 33 and the inner peripheral side surface of the opening 32 are formed around the steam generation surface. And the second steam generation surface 41b. The entire steam generating surface (however, excluding the temperature detecting unit 42 described later) is coated with a hydrophilic paint. In FIG. 10, X shows the position which faces the inner side front-end | tip of the said cylindrical water supply port 38 in the 1st steam generation surface 41a. Water is injected from the water supply port 38 toward the position by the pump 15. For example, Grebe's product “No. 3111” and Okitsumo's product “No. 8037K” are used as the hydrophilic paint, but the present invention is not limited to this.

  As shown in FIG. 12, 42 is a protrusion-like temperature detection unit formed integrally with the first steam generation surface 41a, which is the back side of the heating container 13a, that is, the opposite side where the steam generation surface 41 is not formed. A small hole 44 and a screw hole 45 formed at a certain depth from the surface are respectively formed, and the sensor 31a of the temperature detector 31 such as the thermistor is inserted into the small hole 44 and integrated with the sensor 31a. A screw 52 for fixing the mounting plate 53 is inserted into the screw hole 45. With these structures, the sensor 31a can sensitively detect the surface temperature of the first steam generation surface 41a.

  The position of the temperature detector 42 is slightly lower (about 10 mm in this embodiment) than the position X (see FIG. 10) where water is injected from the water supply port 38 by the pump 15 on the first steam generation surface 41a. is there. As described above, since the sensor 31a of the temperature detector 31 is located directly below the position facing the water supply port, it can be immediately detected that water has actually been supplied onto the steam generation surface 41, so that a heat source for generating steam can be used. Energization of a certain heater 13b can be controlled in a timely manner.

  Note that the steam generation surface 41 is coated with a hydrophilic paint because water is widely spread on the wall surface forming the steam generation chamber (sealed space) BM and a plurality of heat exchange fins 46, 47, and 49 described later. It is because it becomes easy to evaporate because it comes in close contact. On the contrary, since such a hydrophilic paint film is not formed on the temperature detector 42, the detection sensitivity of the sensor 31a of the temperature detector 31 is not impaired.

  As shown in FIGS. 6 and 10, 46 is a protruding heat exchange fin integrally formed on one side of the first steam generation surface 41 a, each having a thickness of about 1 to 2 mm. Are arranged in a row at regular intervals (the mutual interval is about 5 mm). Similarly, as shown in FIGS. 6 and 10, 47 is a protrusion-like heat exchange member formed integrally with the first steam generation surface 41 a on the opposite side of the heat exchange fin 46 across the temperature detection unit 42. Each of the fins has a thickness of about 1 to 2 mm, and four of them are arranged in a line at a constant interval (a mutual interval is about 5 mm). The protrusion height of the heat exchange fins 46 and 47 (the height from the first steam generation surface 41a) is set to about 5 mm. Therefore, a steam circulation space of about 5 mm is secured between the upper ends of the heat exchange fins 46 and 47 and the lid body 35.

  49 is a heat exchange fin integrally formed on the first steam generation surface 41a at the lower position of the steam generation chamber (sealed space) BM, and has a thickness of about 1 to 2 mm and 10 mm from the lowest bottom surface of the sealed space BM. It is formed to have a height of about 8 mm so as to keep a certain distance and to secure a narrow steam circulation space of about 2 mm between the lid 35.

  Reference numeral 50 denotes an upper part of the steam generation chamber (sealed space) BM, that is, two of the three through holes 34 formed so as to pass through the wall surface 33, and are integrally formed side by side at positions immediately below the two through holes 34. These heat exchange fins are about 1-2 mm in thickness and about 8 mm in height so that a narrow steam flow space of about 2 mm can be secured between the lid 35 and facing each other. The distance is about 3 mm, and the distance between the outer second steam generation surface 41 b is about 2 mm.

  Reference numeral 51 denotes one heat exchange fin integrally formed at a position further above the heat exchange fin 50, and is formed in the same size as the heat exchange fin 50. As described above, the heat exchange fins 50 and 51 are provided directly below the through hole 34. Therefore, when the steam is sufficiently heated in the heat exchange fins 46, 47, and 49 and the steam rises, the steam further heats up. It is sufficiently heated while passing through a narrow passage around the replacement fin and reaching the through hole 34 at a high place, and becomes a hot superheated steam.

  Since it is the above structure, if the inside of the heating chamber 2 is made into a high temperature atmosphere, and water is stored in the water storage tank 14 and the pump 15 is operated, the water in the water storage tank 14 is discharged from the first water supply line 16. The water sucked by the pump 15 passes through the second water supply pipe 17 and is injected from the water supply port 38 of the heating container 13 a toward the X position of the steam generation surface 31.

  Since the steam generating surface 41 is heated to a high temperature by the heater 13b in advance, the injected water first collides with the vicinity of the position X facing the water supply port 38 on the steam generating surface 41, and the steam generating surface 41 Vaporizes with high heat. In addition, in the process of flowing down under its own weight from what was not vaporized instantaneously, most of it is vaporized between the heat exchanging fins 46 and 47 and the heat exchanging fin 49 at the lowest position. To do.

  These steams rise by themselves through a narrow gap between the heat exchange fins 46 and 47 and a narrow gap with the lid 35, and are further heated by the heat exchange fins 50 and 51 at the raised position. It becomes superheated steam and is finally ejected from the through-hole 34 in the high place of the steam generation chamber (sealed space) BM, and the inside of the heating chamber 2 can be filled with high-temperature steam.

The left side sectional view of the cooking-by-heating machine of Embodiment 1 of the present invention. The right side sectional view of the heating cooker. The perspective view which shows the assembly | attachment state to the soup and tank receiving member of the water storage tank of the heating cooker. The perspective view of the water storage tank of the heating cooker. The disassembled perspective view of the heating container of the steam generation means of the heating cooker. The side view in the state which removed the cover body of the heating container of the steam generation means of the heating cooker. One side view of the heating container. Is a side view on the opposite side of the heating container. The side view which shows the external appearance of the heating container. The side view in the state where the lid of the heating container was removed. The other side side view of the heating container. Sectional drawing at the time of cutting the heating container vertically at the center. It is sectional drawing at the time of cutting off the same heating container at a position with a temperature detection part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Main body, 2 Heating chamber, 3 Mounting plate, 4 To-be-heated object, 5 Hot-air circulation means (heating means), 6 Magnetron (heating means), 13 Steam generating means, 13a Heating container, 13b Heater (heating element), 14 Water storage tank, 14a Tank container, 14b Top cover, 15 Pump, 16 1st water supply line, 17 2nd water supply line, 19 Water supply pipe, 20 Soup / tank receiving member, 21 Soup receiving part, 22 Tank receiving part, 23 Water Receiving part, 29 joint part, 31 temperature detector, 31a sensor, 34 through hole, 35 lid, 38 water supply port, 41 steam generating surface, 41a first steam generating surface, 41b second steam generating surface, 42 temperature Detector, 46 Heat exchange fins, 47 Heat exchange fins, 49 Heat exchange fins, 50 Heat exchange fins, BM Steam generation chamber (sealed air ).

Claims (14)

A heating container formed of a thermally conductive material having a sealed internal space and having a steam generating surface provided on at least one wall surface forming the space;
A heating element for generating steam by heating water supplied to the steam generation surface from the outside of the heating container;
The heating container is installed so that the steam generation surface is in a vertical or oblique state,
A plurality of protrusion-like heat exchange fins are integrally formed at a predetermined interval on the steam generation surface so as to prevent water supplied from the outside of the heating container from falling by itself. A steam generator characterized by   The water supply port to which evaporating water is supplied from the outside of the heating container is formed in the heating container so as to face the central portion in the vertical direction of the steam generation surface. Steam generator.   A water supply port to which evaporating water is supplied from the outside of the heating container is formed in the heating container so as to face the central portion in the vertical direction of the steam generation surface, and the generated steam is formed above the steam generation surface. The steam generator according to claim 1, wherein an opening for discharging to the outside of the heating container is provided.   The heating container includes a main body having the vapor generating surface on the inner side and an opening formed on one side surface, and a lid attached to the main body so as to close the opening of the main body. The steam generator according to claim 2, wherein the steam generator is attached to the main body, and the water supply port is formed in the lid.   The heating container is provided with a temperature detector for detecting the temperature of the steam generating surface below the position facing the water supply port of the steam generating surface and controlling energization of the heating element. The steam generator according to any one of claims 2 and 3.   The heat exchanging fin has such a height that a predetermined gap is formed between the uppermost part and the lid, and the gap serves as a passage for the steam generated on the steam generating surface. The steam generator according to any one of claims 2 and 3.   The steam generator according to claim 1, wherein a hydrophilic film is formed on a surface of the steam generation surface. Heat cooking comprising a heating chamber for storing an object to be heated, heating means for heating the object to be heated, steam generating means for supplying steam to the heating chamber, and supply means for supplying water to the steam generating means In the vessel
The steam generating means includes
A heating vessel having a sealed internal space and provided with a steam generating surface that is perpendicular or obliquely inclined to at least one wall surface forming the space;
A water supply pipe for supplying water from the supply means toward the steam generation surface of the heating container;
A heating element for heating the vapor generating surface,
The water supplied on the steam generation surface from the water supply pipe is configured to vaporize by receiving heat from the heating element in the process of flowing down the steam generation surface,
Protruding heat exchange fins are spaced apart from each other by a predetermined distance on the steam generation surface so as to prevent water supplied from the water supply pipe from descending at least in a region below the corresponding portion with the water supply pipe. A heating cooker characterized in that a plurality of pieces are formed by placing a plurality of pieces.   The cooking device according to claim 8, wherein an end portion of the water supply pipe is disposed toward a central portion in the vertical direction of the steam generation surface.   The end portion of the water supply pipe is disposed toward a central portion in the vertical direction of the steam generation surface, and an opening for discharging the generated steam is provided at an upper portion of the steam generation surface. The cooking device according to 8.   The heating container includes a main body having the vapor generating surface on the inner side and an opening formed on one side surface, and a lid attached to the main body so as to close the opening of the main body. The cooking device according to claim 8, wherein the cooking device is attached to the main body, and an end portion of the water supply pipe is connected to a water supply port formed in the lid.   The heating vessel is provided with a temperature detector for detecting the temperature of the steam generation surface and controlling the energization of the heating element at a position below the position facing the water supply port of the steam generation surface. The heating cooker according to any one of claims 9 and 10.   The heat exchanging fin has such a height that a predetermined gap is formed between the uppermost part and the lid, and the gap serves as a passage for the steam generated on the steam generating surface. The heating cooker according to any one of claims 9 and 10.   The steam generator according to claim 8, wherein a hydrophilic film is formed on a surface of the steam generating surface.

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