JP2006284015A - Heating cooker and steam generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker capable of quickly rising superheated steam, and shortening a cooking time, and to provide a steam generator using the same. <P>SOLUTION: This heating cooker comprises a pot 41 to which water is supplied, and heater portions 42A, 42B formed near a bottom portion 41b of the pot 41 in such manner that at least their upper sides are positioned on the approximate one horizontal face. The bottom portion 41b of the pot 41 is provided with a projecting portion 47 lower than a prescribed water level of the water supplied into the pot 41 at a prescribed interval to the heater portions 42A, 42B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cooking device and a steam generator.

  2. Description of the Related Art Conventionally, as a cooking device that uses steam to cook an object to be heated such as food, there is one that sends superheated steam into an oven cabinet (see, for example, Patent Document 1 (Japanese Patent Laid-Open No. Hei 8-49854)). . This heating cooker includes a steam generator that generates steam by providing a heater along a vertical plane in the pot, and a steam superheater that generates superheated steam by heating the steam generated by the steam generator. The superheated steam generated by the steam superheater is fed into the oven to cook food.

  However, in the above cooking device, since the heater is arranged along the vertical plane in the pot, a lot of water must be heated in the pot. There is a problem that it takes time, the rising of the superheated steam cannot be made earlier, and the cooking time becomes longer than that of a microwave oven or the like.

In addition, there has been no steam generator suitable for such an application that requires such a fast rise of steam.
JP-A-8-49854 (FIG. 8)

  SUMMARY OF THE INVENTION An object of the present invention is to provide a cooking device that can accelerate the rise of superheated steam and shorten the cooking time.

  Another object of the present invention is to provide a steam generator that is capable of quickly raising the steam and is optimal for a device that performs cooking such as a cooking device.

In order to achieve the above object, the heating cooker of the present invention is
A steam generator for generating steam;
A steam temperature raising device for raising the temperature of the steam from the steam generator;
A heating chamber for heating an object to be heated by steam supplied from the steam heating device,
The steam generating device has a pot to which water is supplied, and a heater portion disposed so that at least the upper side is on substantially the same horizontal plane in the vicinity of the bottom portion in the pot,
A convex portion lower than a predetermined water level of water supplied into the pot is provided at a bottom portion of the pot at a predetermined interval with respect to the heater portion.

  According to the heating cooker having the above-described configuration, the pot is provided at a part of the bottom of the pot with a convex portion lower than a predetermined level of water supplied into the pot at a predetermined interval with respect to the heater portion. The amount of water in the pot heated by the heater part is determined by filling the space from the bottom of the heater part to the lower part of the heater part with a convex part and determining the predetermined water level slightly above the upper side on the substantially same horizontal surface of the heater part. It is possible to reduce as much as possible. Thereby, the rise of steam generation by the steam generator can be accelerated. Then, the steam generated by the steam generator is heated by the steam temperature raising device to be superheated steam, and the heated object is heated by supplying the superheated steam into the heating chamber. Therefore, by raising the rise of steam generation by the steam generator, the rise of the superheated steam supplied to the heating chamber can be made faster, and the cooking time can be shortened.

  Moreover, the heating cooker of one Embodiment is the bottom part of the pot which the said convex part respond | corresponds to the part shallower than the lowermost lower end of the said heater part, or the bottom part of the said pot in which the said heater part is not upwards It is provided in at least one of the regions.

  According to the cooking device of the above embodiment, by providing a convex portion in the bottom region of the pot corresponding to a portion shallower than the lowermost lower end of the heater portion, the heater portion is below the predetermined water level. The space between the shallow portion on the side and the bottom of the pot can be reduced, and the amount of water can be reduced accordingly. Moreover, by providing a convex part in the area | region of the bottom part of the pot which does not have the said heater part upwards, the space between a water surface and the bottom part of a pot can be made small, and the amount of water can be reduced.

  Moreover, the heating cooker of one Embodiment is characterized by the said heater part being a sheathed heater.

  According to the heating cooker of the above embodiment, when the sheathed heater is curved and stored in the pot, the bottom region of the pot corresponding to the shallow portion below the heater portion with respect to the predetermined water level, An area at the bottom of the pot where the heater portion is not above is formed, and an extra space for increasing the amount of water is formed, so that the amount of water can be reduced more effectively by the convex portion. Therefore, the generation of steam by the steam generator can be started more quickly.

  The heating cooker according to an embodiment includes a sheathed heater having a curved large pipe diameter and a sheathed heater having a curved small pipe diameter, which is disposed on the inner side of the sheathed heater having the large pipe diameter. It is characterized by being.

  According to the heating cooker of the above embodiment, when the radius of curvature of the curved portion of the sheath heater with the large pipe diameter and the sheath heater with the small pipe diameter is set to the minimum radius of curvature determined by the pipe diameter of the sheath heater, the large pipe Since the minimum radius of curvature of the sheath heater having a small tube diameter is smaller than that of the sheath heater having a small diameter, the sheath heater having a small tube diameter is disposed inside the sheath heater having a large tube diameter. Thus, if the input power to the heater unit is the same, the occupied volume of the region surrounded by the outer edge of the heater unit composed of two types of sheathed heaters having different diameters can be reduced. Therefore, the volume in which the heater part in the pot is immersed in water can be reduced, and the rise of steam generation can be further accelerated by increasing the heater power with respect to the amount of water in the pot. In addition, by switching the energization of the large-power large-diameter sheathed heater and the small-power small-diameter sheathed heater, it is possible to adjust the electric power supplied for steam generation by the combination. Steam can be generated according to the content.

The steam generator of the present invention is
A pot supplied with water;
Near the bottom in the pot, provided with a heater portion arranged so that at least the upper side is substantially on the same horizontal plane,
A convex portion lower than a predetermined level of water supplied into the pot is provided at a part of the bottom of the pot at a predetermined interval with respect to the heater portion.

  According to the steam generator having the above-described configuration, the pot is provided at a part of the bottom of the pot with a protrusion lower than a predetermined level of water supplied into the pot at a predetermined interval from the heater. The amount of water in the pot heated by the heater part is determined by filling the space from the bottom of the heater part to the lower part of the heater part with a convex part and determining the predetermined water level slightly above the upper side on the substantially same horizontal surface of the heater part. It is possible to reduce as much as possible. Thereby, the rise of steam generation can be accelerated. Then, the generated steam is heated by a steam temperature raising device to be superheated steam, and the superheated steam is supplied into the heating chamber to heat the object to be heated in the heating chamber. Therefore, by raising the rise of steam generation, the rise of superheated steam supplied to the heating chamber can be made faster, and the cooking time can be shortened.

  Also, in one embodiment of the steam generating device, the convex portion corresponds to a portion shallower than the lowermost lower end of the heater portion, or the bottom portion of the pot where the heater portion is not upward. It is provided in at least one of the regions.

  According to the steam generator of the above embodiment, the convex portion is provided in the bottom region of the pot corresponding to the shallower portion than the lowermost lower end of the heater portion, thereby lowering the heater portion with respect to the predetermined water level. The space between the shallow portion on the side and the bottom of the pot can be reduced, and the amount of water can be reduced accordingly. Moreover, by providing a convex part in the area | region of the bottom part of the pot which does not have the said heater part upwards, the space between a water surface and the bottom part of a pot can be made small, and the amount of water can be reduced.

  In one embodiment, the steam generator is a sheathed heater.

  According to the steam generator of the above embodiment, when the sheathed heater is curved and stored in the pot, the bottom area of the pot corresponding to the shallow part below the heater section with respect to the predetermined water level, An area at the bottom of the pot where the heater portion is not above is formed, and an extra space for increasing the amount of water is formed, so that the amount of water can be reduced more effectively by the convex portion. Therefore, the generation of steam by the steam generator can be started more quickly.

  In one embodiment, the steam generator includes a curved large-diameter sheathed heater, and a curved small-diameter sheathed heater disposed inside the large-diameter sheathed heater. It is characterized by being.

  According to the steam generator of the above embodiment, when the radius of curvature of the curved portion of the sheath heater with the large pipe diameter and the sheath heater with the small pipe diameter is set to the minimum radius of curvature determined by the pipe diameter of the sheath heater, the large pipe Since the minimum radius of curvature of the sheath heater having a small tube diameter is smaller than that of the sheath heater having a small diameter, the sheath heater having a small tube diameter is disposed inside the sheath heater having a large tube diameter. Thus, if the input power to the heater unit is the same, the occupied volume of the region surrounded by the outer edge of the heater unit composed of two types of sheathed heaters having different diameters can be reduced. Therefore, the volume in which the heater part in the pot is immersed in water can be reduced, and the rise of steam generation can be further accelerated by increasing the heater power with respect to the amount of water in the pot. In addition, by switching the energization of the large-power large-diameter sheathed heater and the small-power small-diameter sheathed heater, it is possible to adjust the electric power input for steam generation by the combination, which is necessary. Steam generation according to

  As is clear from the above, according to the heating cooker of the present invention, the rise of the superheated steam can be quickened and the cooking time can be shortened.

  Moreover, according to the steam generator of this invention, the rise of steam can be accelerated, and a steam generator optimal for a device that performs steam heating, such as a heating cooker, can be realized.

  Hereinafter, a cooking device and a steam generator according to the present invention will be described in detail with reference to embodiments shown in the drawings.

  Hereinafter, the cooking device of the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is an external perspective view of a heating cooker 1 using a blower according to an embodiment of the present invention. An operation panel 11 is provided at the upper part of the front of a rectangular parallelepiped cabinet 10 and an operation panel on the front of the cabinet 10 is shown. A door 12 that rotates about the lower end side is provided below 11. A handle 13 is provided on the top of the door 12, and a heat-resistant glass window 14 is provided on the door 12.

  FIG. 2 is an external perspective view showing a state where the door 12 of the heating cooker 1 is opened, and a rectangular parallelepiped heating chamber 20 is provided in the cabinet 10. The heating chamber 20 has an opening 20a on the front side facing the door 12, and the side surface, bottom surface, and top surface of the heating chamber 20 are formed of stainless steel plates. Further, the door 12 is formed of a stainless steel plate on the side facing the heating chamber 20. A heat insulating material (not shown) is disposed around the heating chamber 20 and inside the door 12 to insulate the inside of the heating chamber 20 from the outside.

  Further, a stainless steel receiving tray 21 is placed on the bottom surface of the heating chamber 20, and a stainless steel wire rack 24 (shown in FIG. 3) for placing an object to be heated is placed on the receiving tray 21. Furthermore, the side surface steam blower outlet 22 (only one is shown in FIG. 2) of the substantially rectangular shape whose longitudinal direction is substantially horizontal is provided in the both sides | surfaces of the heating chamber 20. As shown in FIG.

  FIG. 3 is a schematic configuration diagram showing the basic configuration of the heating cooker 1. As shown in FIG. 3, the heating cooker 1 includes a heating chamber 20, a water tank 30 that stores water for steam, a steam generator 40 that evaporates water supplied from the water tank 30, and the steam generator 40. A steam temperature raising device 50 for heating the steam from the steam generator, and a control device 80 for controlling the steam generating device 40, the steam temperature raising device 50, and the like.

  A grid-like rack 24 is placed on a receiving tray 21 placed in the heating chamber 20, and an object to be heated 90 is placed in the approximate center of the rack 24.

  In addition, a connecting portion 30 a provided on the lower side of the water tank 30 is connected to a funnel-shaped receiving port 31 a provided at one end of the first water supply pipe 31. The suction side of the pump 35 is connected to the other end of the second water supply pipe 32 that branches from the first water supply pipe 31 and extends upward, and one end of the third water supply pipe 33 is connected to the discharge side of the pump 35. Further, a water tank water level sensor 36 is disposed at the upper end of a water level sensor pipe 38 that branches off from the first water supply pipe 31 and extends upward. Furthermore, the upper end of the air release pipe 37 branched from the first water supply pipe 31 and extending upward is connected to an exhaust duct 65 described later.

  The third water supply pipe 33 has an L shape that is bent substantially horizontally from a vertically disposed portion, and an auxiliary tank 39 is connected to the other end of the third water supply pipe 33. One end of the fourth water supply pipe 34 is connected to the lower end of the auxiliary tank 39, and the other end of the fourth water supply pipe 34 is connected to the lower end of the steam generator 40. In addition, one end of the drain valve 70 is connected to the lower end of the steam generator 40 to which the fourth water supply pipe 34 is connected. One end of a drain pipe 71 is connected to the other end of the drain valve 70, and a drain tank 72 is connected to the other end of the drain pipe 71. Note that the upper portion of the auxiliary tank 39 communicates with the atmosphere via the atmosphere opening pipe 37 and the exhaust duct 65.

  When the water tank 30 is connected, the water in the water tank 30 rises into the air release pipe 37 until the water tank 30 reaches the same water level. Since the water level sensor pipe 38 connected to the water tank water level sensor 36 is sealed at the tip, the water level does not rise, but the pressure in the sealed space of the water level sensor pipe 38 is large according to the water level of the water tank 30. Rise from atmospheric pressure. By detecting this pressure change by a pressure detection element (not shown) in the water tank water level sensor 36, the water level in the water tank 30 is detected. In the measurement of the water level when the pump 35 is stationary, the pipe 37 for opening to the atmosphere is unnecessary, but in order to prevent the suction pressure of the pump 35 from acting directly on the pressure detection element and reducing the accuracy of water level detection of the water tank 30. An open air pipe 37 having an open end is used.

  Further, the steam generating device 40 includes a pot 41 having the other end of the fourth water supply pipe 34 connected to the lower side, a heater portion 42 disposed near the bottom surface in the pot 41, and a heater portion 42 in the pot 41. It has a water level sensor 43 arranged in the vicinity of the upper side and a steam suction ejector 44 attached to the upper side of the pot 41. And the fan casing 26 is arrange | positioned on the outer side of the suction inlet 25 provided in the side surface upper part of the heating chamber 20. As shown in FIG. The steam in the heating chamber 20 is sucked from the suction port 25 by the blower fan 28 arranged in the fan casing 26. The sucked steam is sent to the inlet side of the steam suction ejector 44 of the steam generator 40 through the first pipe 61 and the second pipe 62. The first pipe 61 is disposed substantially horizontally and has one end connected to the fan casing 26. The second pipe 62 is disposed substantially vertically, and has one end connected to the other end of the first pipe 61 and the other end connected to the inlet side of the inner nozzle 45 of the vapor suction ejector 44.

  The vapor suction ejector 44 includes an outer nozzle 46 that wraps the outside of the inner nozzle 45, and the discharge side of the inner nozzle 45 communicates with the internal space of the pot 41. The discharge side of the outer nozzle 46 of the steam suction ejector 44 is connected to one end of the third pipe 63, and the steam temperature raising device 50 is connected to the other end of the third pipe 63.

  The fan casing 26, the first pipe 61, the second pipe 62, the steam suction ejector 44, the third pipe 63 and the steam temperature raising device 50 form an external circulation path 60. One end of the discharge passage 64 is connected to the discharge port 27 provided on the lower side of the side surface of the heating chamber 20, and the other end of the discharge passage 64 is connected to one end of the exhaust duct 65. An exhaust port 66 is provided at the other end of the exhaust duct 65. A radiator 69 is externally fitted and attached to the exhaust duct 65 side of the vapor discharge passage 64. A connection portion between the first pipe 61 and the second pipe 62 forming the external circulation path 60 is connected to the exhaust duct 65 via the exhaust passage 67. A damper 68 that opens and closes the exhaust passage 67 is disposed on the connection side of the exhaust passage 67 to the first and second pipes 61 and 62.

  In addition, the steam temperature raising device 50 includes a dish-shaped case 51 disposed on the ceiling side and substantially in the center of the heating chamber 20 with the opening facing downward, and a first steam heater 52 disposed in the dish-shaped case 51. And a second steam heater 53 disposed in the dish-shaped case 51. The bottom surface of the dish-shaped case 51 is formed by a metal ceiling panel 54 provided on the ceiling surface of the heating chamber 20. A plurality of ceiling steam outlets 55 are formed in the ceiling panel 54. Further, the ceiling panel 54 is finished in a dark color by painting or the like on the upper and lower surfaces. Note that the ceiling panel 54 may be formed of a metal material that changes to a dark color by repeated use or a dark-colored ceramic molded product.

  Further, the steam temperature raising device 50 is connected to one ends of steam supply passages 23 (only one is shown in FIG. 3) extending on the left and right sides of the heating chamber 20. The other end of the steam supply passage 23 extends downward along both side surfaces of the heating chamber 20 and is connected to side surface steam outlets 22 provided on both side surfaces and the lower side of the heating chamber 20.

  Next, the control block of the heating cooker 1 shown in FIG. 4 will be described.

  As shown in FIG. 4, the control device 80 includes a blower fan 28, a first steam heater 52, a second steam heater 53, a damper 68, a drain valve 70, and a first steam generator heater 42 </ b> A. The second steam generating heater 42B, the operation panel 11, the water tank water level sensor 36, the water level sensor 43, and the pump 35 are connected.

  The control device 80 includes a microcomputer, an input / output circuit, and the like. Based on detection signals from the water tank water level sensor 36 and the water level sensor 43, the blower fan 28, the first steam heater 52, and the second steam heater 53 are provided. The damper 68, the drain valve 70, the first steam generating heater 42A, the second steam generating heater 42B, the operation panel 11 and the pump 35 are controlled according to a predetermined program.

  Next, the principal part of the steam generator 40 is demonstrated in detail using FIGS. 5 is a plan view of the pot 41 of the steam generator 40 as viewed from above, FIG. 6 is a cross-sectional view of the pot 41 as viewed from line VI-VI in FIG. 5, and FIG. It is sectional drawing of the pot 41 seen from the line.

  As shown in FIG. 5, the pot 41 includes a cylindrical portion 41 a having a substantially rectangular horizontal plane, a bottom portion 41 b provided below the cylindrical portion 41 a, and a water supply port (not shown) provided in the bottom portion 41 b. And have. The planar shape of the pot 41 has an aspect ratio of 1: 2.5, but may be an elongated shape, that is, a rectangular shape or an elliptical shape.

  A heater section 42 is disposed near the bottom 41b in the pot 41, and the heater section 42 is disposed inside the first steam generating heater 42A and the first steam generating heater 42A, which are large-diameter sheathed heaters. The second steam generating heater 42B is a sheathed heater having a small pipe diameter.

  In this embodiment, the first steam generating heater 42A uses a 700 W large diameter sheathed heater, and the second steam generating heater 42B uses a 300 W small diameter sheathed heater.

  The first steam generating heater 42A includes a connecting portion 42Aa, a straight portion 42Ab having one end connected to the other end of the connecting portion 42Aa, a substantially semicircular arc-shaped curved portion 42Ac having one end connected to the other end of the straight portion 42Ab, and a curved portion. A straight portion 42Ad having one end connected to the other end of the portion 42Ac; a substantially semicircular arc-shaped curved portion 42Ae having one end connected to the other end of the linear portion 42Ad; and one end connected to the other end of the curved portion 42Ae; One end is connected to the other end of the linear portion 42Af and the other end of the linear portion 42Af, and the other end of the curved portion 42Ag has one end connected to the other end of the curved portion 42Ag. It has a linear portion 42Ah that is arranged below the linear portion 42Ad and a connecting portion 42Ai that has one end connected to the other end of the linear portion 42Ah.

  The second steam generating heater 42B includes a connection portion 42Ba, a straight portion 42Bb having one end connected to the other end of the connection portion 42Ba, and a substantially semicircular arc-shaped curved portion 42Bc having one end connected to the other end of the straight portion 42Bb. The straight portion 42Bd has one end connected to the other end of the curved portion 42Bc, the bent portion 42Be connected to the other end of the straight portion 42Bd, and the connecting portion 42Bf connected to the other end of the bent portion 42Be. .

  The curved portions 42Ac, 42Ae, 42Ag of the first steam generating heater 42A have a minimum radius of curvature determined by the sheath heater having a large pipe diameter to be used, and the curved portion 42Bc of the second steam generating heater 42B is a small pipe to be used. The minimum radius of curvature is determined by the diameter of the sheathed heater.

  Further, as shown in FIGS. 6 and 7, a convex portion 47 lower than a predetermined water level of water supplied into the pot 41 is formed on a part of the bottom 41b of the pot 41 with respect to the heater portions (42A, 42B). Provided at a predetermined interval. The heater part 42 is disposed close to the side wall of the cylinder part 41a of the pot 41, and the shortest distance between the outer edge of the heater part (42A, 42B) and the side wall of the cylinder part 41a is 2 mm to 5 mm. Moreover, the lower end of the heater part (42A, 42B) is disposed close to the bottom part 41b of the pot 41, and the bottom side of the heater part (42A, 42B) and the bottom part 41b of the pot 41 (including the convex part 47). The shortest distance is 2 mm to 5 mm.

  A water level sensor 43 (shown in FIG. 3) is disposed on the side wall near the upper side of the heater part 42 in the pot 41 and on the non-heat generating part side inside the second steam generating heater 42B. Further, a temperature sensor (not shown) is disposed on the side wall of the pot 41 that faces the water level sensor.

  The water level sensor 43 is a self-heating thermistor, and in water, a temperature of about 100 ° C. to 140 ° C. is detected according to the temperature of water of 20 ° C. to 100 ° C., and in the air, about 140 ° C. to about 150 ° C. The temperature is detected. Then, based on the temperature of the water detected by the temperature sensor, the temperature detected by the water level sensor 43 is determined to determine whether or not there is water at the mounting position of the water level sensor 43.

  In the cooking device 1 configured as described above, a power switch (not shown) in the operation panel 11 is pressed to turn on the power, and the operation of the cooking operation is started by operating the operation panel 11. Then, the control device 80 first starts the operation of the pump 35 with the drain valve 70 closed and the exhaust passage 67 closed by the damper 68. Water is supplied from the water tank 30 into the pot 41 of the steam generator 40 through the first to fourth water supply pipes 31 to 34 by the pump 35. And if the water level sensor 43 detects that the water level in the pot 41 has reached the predetermined water level, the pump 35 is stopped to stop water supply.

  Next, the heater unit 42 is energized, and a predetermined amount of water accumulated in the pot 41 is heated by the heater unit 42.

  Next, simultaneously with the energization of the heater section 42 or when the temperature of the water in the pot 41 reaches a predetermined temperature, the blower fan 28 is turned on and the first steam heater 52 of the steam heating device 50 is energized. . Then, the blower fan 28 sucks air (including steam) in the heating chamber 20 from the suction port 25 and sends out air (including steam) to the external circulation path 60. Since a centrifugal fan is used as the blower fan 28, a higher pressure can be generated compared to the propeller fan. Furthermore, by rotating the centrifugal fan used for the blower fan 28 at a high speed with a DC motor, the flow velocity of the circulating airflow can be extremely increased.

  Next, when the water in the pot 41 of the steam generator 40 boils, saturated steam is generated, and the generated saturated steam joins the circulating airflow passing through the external circulation path 60 at the steam suction ejector 44. The steam discharged from the steam suction ejector 44 flows into the steam temperature raising device 50 through the third pipe 63 at a high speed.

  Then, the steam that has flowed into the steam temperature raising device 50 is heated by the first steam heater 52 and becomes superheated steam at approximately 300 ° C. (depending on the cooking content). A part of the superheated steam is ejected downward from the plurality of ceiling steam outlets 55 provided in the lower ceiling panel 54 in the heating chamber 20. Further, another part of the superheated steam is ejected from the side surface steam outlets 22 on both side surfaces of the heating chamber 20 through the steam supply passages 23 provided on both the left and right sides of the steam heating device 50.

  By forming convection of superheated steam in the heating chamber 20 in this way, the superheated steam from the steam heating device 50 is sent to the ceiling steam outlet 55 while maintaining the temperature and humidity distribution in the heating chamber 20 uniform. It can be ejected from the side air outlet 22 and efficiently collide with the heated object 90 placed on the rack 24. Then, the object to be heated 90 is heated by the collision of superheated steam. At this time, the superheated steam that has contacted the surface of the object to be heated 90 also heats the object to be heated 90 by releasing latent heat when dew condensation occurs on the surface of the object to be heated 90. As a result, a large amount of heat of the superheated steam can be uniformly and quickly applied to the entire surface of the article 90 to be heated. Therefore, it is possible to realize cooking with no unevenness and good finish.

  Further, in the above cooking operation, when time elapses, the amount of steam in the heating chamber 20 increases, and the surplus amount of steam passes from the discharge port 27 through the discharge passage 64 and the exhaust duct 65. And discharged from the exhaust port 66 to the outside. At this time, the steam 69 passing through the discharge passage 64 is cooled and condensed by the radiator 69 provided in the discharge passage 64, thereby preventing the steam from being discharged to the outside as it is. The water condensed in the discharge passage 64 by the radiator 69 flows down in the discharge passage 64 and is guided to the receiving tray 21, and is processed together with the water generated by cooking after the cooking.

  After the cooking is finished, the control device 80 displays a cooking end message on the operation panel 11 and further sounds a signal by a buzzer (not shown) provided on the operation panel 11. Thereby, when the user who knows the end of cooking opens the door 12, the control device 80 detects that the door 12 has been opened by a sensor (not shown), and instantly opens the damper 68 of the exhaust passage 67. . Thereby, the first pipe 61 of the external circulation path 60 communicates with the exhaust duct 65 through the exhaust passage 67, and the steam in the heating chamber 20 is blown by the blower fan 28 through the suction port 25, the first pipe 61, and the exhaust passage 67. And is discharged from the exhaust port 66 through the exhaust duct 65. This damper operation is the same even if the user opens the door 12 during cooking. Therefore, the user can safely remove the object to be heated 90 from the heating chamber 20 without being exposed to steam.

  According to the cooking device configured as described above, the bottom portion 41b of the pot 41 is provided with the convex portion 47 lower than the predetermined water level in the pot 41 at a predetermined interval with respect to the heater portion 42. A part of the space from 41b to the lower side of the heater part 42 is filled with the convex part 47, and the amount of water in the pot 41 heated by the heater part 42 can be reduced as much as possible without reducing the area of the water surface where steam is generated. The rise of steam generation by the steam generator 40 can be accelerated. Therefore, by raising the rise of the steam generation by the steam generator 40, the rise of the superheated steam supplied to the heating chamber can be made faster, and the cooking time can be shortened.

  Further, in the region of the bottom 41b of the pot 41 corresponding to the portion (second steam generating heater 42B) shallower than the lowermost lower end of the heater portion 42 and the region of the bottom 41b of the pot 41 where the heater portion 42 is not located above. By providing the convex part 47, the space between the water surface and the bottom part 41b of the pot 41 can be reduced, and the amount of water can be reduced accordingly.

  Further, when the sheathed heater is curved and stored in the pot 41, the region of the bottom 41b of the pot 41 corresponding to a portion shallower than the lowermost lower end of the heater portion 42, or the pot 41 where the heater portion 42 is not located above. Since an area of the bottom 41b is formed and an extra space for increasing the amount of water is formed, the amount of water can be reduced more effectively by the convex portion 47. Therefore, the generation of steam by the steam generator 40 can be started up earlier.

  In addition, by using the curved large-diameter sheathed heater and the curved small-diameter sheathed heater arranged on the inner side of the large-diameter sheathed heater for the heater section 42, If the input power is the same, the occupied volume of the region surrounded by the outer edge of the heater unit 42 composed of two types of sheathed heaters having different diameters can be easily reduced. Therefore, the rise of steam generation can be further accelerated by reducing the amount of water stored in the bottom of the pot 41 in accordance with the size of the heater portion 42 and increasing the heater power with respect to the amount of water. Further, by switching the energization of the first steam generating heater 42A using the large-power large-diameter sheathed heater and the second steam generating heater 42B using the small-power small-diameter sheathed heater, the combination can be changed. It is possible to adjust the electric power input for generating steam, and it is possible to generate steam according to cooking contents.

  In the above embodiment, the sheathed heater is used. However, a cartridge heater having a heating plane may be used.

  In the above embodiment, the steam generator 40 uses the first steam generating heater 42A, which is a sheathed heater having a large pipe diameter, and the second steam generating heater 42B, which is a sheathed heater having a small pipe diameter, for the heater section 42. However, the shape of the heater part is not limited to this, and it may be a heater part arranged in the vicinity of the bottom part in the pot so that at least the upper side is substantially on the same horizontal plane.

  For example, it may have a shape like the heater 142 shown in FIGS. FIG. 8 shows a plan view of a pot 141 using another heater unit 142 of the steam generator, and FIG. 9 shows a cross-sectional view of the pot 141 as seen from the line IX-IX in FIG.

  As shown in FIG. 8, the heater unit 142 includes a first steam generating heater 142A and a second steam generating heater 142B. The first steam generating heater 142A has a curved portion 142Aa having a substantially semicircular arc shape, and two straight portions 142Ab and 142Ac extending substantially in parallel from both ends of the curved portion 142Aa. The second steam generating heater 142B has a curved portion 142Ba having a substantially semicircular arc shape and two straight portions 142Bb and 142Bc extending substantially in parallel from both ends of the curved portion 142Ba. The curved portion 142Aa of the first steam generating heater 142A has a minimum radius of curvature determined by the sheath heater having a large pipe diameter to be used, and the curved portion 142Ba of the second steam generating heater 142B is a sheathed heater having a small pipe diameter to be used. Is the minimum radius of curvature determined by (<minimum radius of curvature of the first steam generating heater 142A). In addition, as shown in FIG. 9, the pot 141 has a bottom 141 b in a region where the heater portion 142 is not located above, that is, a region of the bottom 141 b of the pot 141 that faces the inner region of the second steam generating heater 142 B. Convex portions 147 lower than a predetermined water level of water supplied to the heater portion 142 are provided at a predetermined interval.

FIG. 1 is an external perspective view of a cooking device using a steam generator according to an embodiment of the present invention. FIG. 2 is an external perspective view of the heating cooker with the door opened. FIG. 3 is a schematic configuration diagram showing the configuration of the cooking device. FIG. 4 is a control block diagram of the cooking device. FIG. 5 is a plan view of the pot of the steam generator as viewed from above. 6 is a cross-sectional view of the pot as seen from line VI-VI in FIG. 7 is a cross-sectional view of the pot as seen from the line VII-VII in FIG. FIG. 8 is a plan view of a pot using another heater unit of the steam generator. 9 is a cross-sectional view of the pot as seen from the line IX-IX in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heating cooker 11 ... Operation panel 12 ... Door 13 ... Handle 14 ... Window 20 ... Heating chamber 21 ... Receptacle 22 ... Side surface steam outlet 23 ... Steam supply passage 24 ... Rack 25 ... Inlet 26 ... Fan casing 27 ... Release Outlet 28 ... Blower fan 30 ... Water tank 31 ... First water supply pipe 32 ... Second water supply pipe 33 ... 3rd water supply pipe 34 ... 4th water supply pipe 35 ... Pump 36 ... Water tank water level sensor 37 ... Air release pipe 38 ... Pipe for water level sensor 39 ... Auxiliary tank 40 ... Steam generator 41, 141 ... Pot 41a ... Tube part 41b, 141b ... Bottom part 42, 142 ... Heater part 42A, 142A ... First steam generating heater 42B, 142B ... Second steam Generation heater 43 ... Water level sensor 44 ... Steam suction ejector 45 ... Inner nozzle 46 ... Outer nozzle 47 ... Convex part 50 ... Steaming Temperature raising device 51 ... dish-shaped case 52 ... first steam heater 53 ... second steam heater 60 ... external circulation path 61 ... first pipe 62 ... second pipe 63 ... third pipe 64 ... discharge passage 65 ... exhaust duct 66 ... Exhaust port 67 ... Exhaust passage 68 ... Damper 69 ... Radiator 70 ... Drain valve 71 ... Drain pipe 72 ... Drain tank 80 ... Control device

Claims (8)

A steam generator for generating steam;
A steam temperature raising device for raising the temperature of the steam from the steam generator;
A heating chamber for heating an object to be heated by steam supplied from the steam heating device,
The steam generating device has a pot to which water is supplied, and a heater portion disposed so that at least the upper side is on substantially the same horizontal plane in the vicinity of the bottom portion in the pot,
A heating cooker, wherein a convex portion lower than a predetermined water level of water supplied into the pot is provided at a bottom of the pot at a predetermined interval with respect to the heater portion. The heating cooker according to claim 1, wherein
The convex portion is provided in at least one of a region of the bottom portion of the pot corresponding to a portion shallower than a lowermost lower end of the heater portion or a region of the bottom portion of the pot where the heater portion is not above. A cooking device characterized by. The heating cooker according to claim 1 or 2,
The heating cooker, wherein the heater section is a sheathed heater. The heating cooker according to claim 1 or 2,
The heater is a curved sheathed heater having a large tube diameter and a sheathed heater having a curved small tube diameter disposed inside the sheathed heater having the large tube diameter. A pot supplied with water;
Near the bottom in the pot, provided with a heater portion arranged so that at least the upper side is substantially on the same horizontal plane,
A steam generating device, wherein a convex portion lower than a predetermined water level of water supplied into the pot is provided at a part of a bottom portion of the pot at a predetermined interval with respect to the heater portion. In the steam generator according to claim 5,
The convex portion is provided in at least one of a region of the bottom portion of the pot corresponding to a portion shallower than a lowermost lower end of the heater portion or a region of the bottom portion of the pot where the heater portion is not above. A steam generator characterized by. The steam generator according to claim 5 or 6,
A steam generator, wherein the heater section is a sheathed heater. The steam generator according to claim 5 or 6,
The steam generator is a sheathed heater having a curved large pipe diameter and a sheathed heater having a curved small pipe diameter disposed inside the sheathed heater having the large pipe diameter.

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