JP4633185B2 - Steam cooker - Google Patents

Description

The present invention relates to a steam cooker.

Many proposals have been made for cooking devices that use steam for cooking. Examples thereof can be seen in Patent Documents 1 and 2 . Patent Document 1 describes a steam cooking apparatus that injects steam into a food tray. Patent Document 2 feeding superheated steam to the oven chamber, or heating cooking apparatus that has been described for the steam in the oven chamber superheated steam by radiation heating.

Japanese Utility Model Publication No. 3-67902 (full text specification, page 6-11, FIG. 1-3) JP-A-8-49854 (page 3-4, FIGS. 1, 2-8)

The steam cooking device described in Patent Document 1 is a business device that supplies steam from a steam supply pipe to a plurality of food trays. This configuration is visually undesirable because the steam supply pipe is exposed in the heating chamber, and is not suitable for a domestic cooker. The steam injection range is restricted by the shape of the steam supply pipe, and it is difficult to spray the steam evenly on the food (heated object) in the heating chamber. In addition, the steam that heats the food is directly discharged from the steam discharge hole, or condensed and discharged from the discharge pipe. Therefore, in order to continue cooking, a large amount of steam must be continuously supplied from the outside. You need a big boiler. In this way, it is not suitable for the home because it consumes a large amount of energy.

  The cooking device described in Patent Document 2 does not inject steam toward the object to be heated, but generates steam in the device, and does not use an external boiler, so it can be used in a general household. In addition, since steam is circulated in the oven, energy efficiency is good. However, cooking of an object to be heated with steam is a process in which steam introduced into the oven chamber or steam generated in the oven chamber wraps the object to be heated and cooks, and a large amount of heat is quickly applied. It is unsatisfactory to give heated food and cook at high speed.

  The present invention has been made in view of the above points, and an object thereof is to provide a steam cooker having a structure suitable for home use and having high heating efficiency. Another object is to reduce the amount of heat dissipated without being used for cooking.

In order to achieve the above object, a steam cooker according to the present invention includes a heating chamber in which an object to be heated is placed , a steam generation container that supplies steam to the heating chamber, and a water supply unit that supplies water to the steam generation container. The steam generation container includes a radiation fin provided inside and at least a part of which is exposed on the water surface, and a heater for heating the steam generation container, wherein the heater is an inner space of the steam generation container. The heat dissipating fin is attached to the inner wall surface of the steam generating container, and the water supply part supplies water to the vicinity of the heat dissipating fin from a position above the bottom of the steam generating container. It is a feature.

In the steam cooker having the above-described configuration, the present invention is characterized in that the radiating fin is attached in the vicinity of the heater .

In the steam cooker having the above-described configuration, the present invention is characterized in that the radiating fin is formed in a flat plate shape .

In the steam cooker having the above-described configuration, the present invention is characterized in that a part of the heater is disposed above the other part .

According to the present invention, in the steam cooker configured as described above, a part of the heater is disposed above the water surface of the steam generating container, and the other part of the heater is disposed below the water surface of the steam generating container. It is characterized in that the.

Or the present invention is the steam cooker of the above-described configuration, the outer circulation passage for jetting a gas sucked from the heating chamber through the gas inlet into the heating chamber through the fumarole, to the blowholes from the gas inlet It is characterized by comprising a blower that forms a flowing air flow in the external circulation path, and a gas heater that heats the gas passing through the external circulation path .

According to this configuration, the gas in the heating chamber circulates through the external circulation path and is heated in the external circulation path in the process. The energy efficiency is high and it can be suitable for home use. Further, since the gas is ejected into the heating chamber through the nozzle holes and collides with the object to be heated in the heating chamber, a large amount of heat can be quickly given to the object to be heated for high speed cooking. The gas is sucked into the gas suction port from the heating chamber and forms a forced circulation air current that is ejected into the heating chamber through the air holes, thereby further heating the object to be heated.

Moreover, the present invention is characterized in that, in the steam cooker configured as described above, the water supply section intermittently performs a water supply operation.

According to the present invention, it is possible to provide a steam cooker having a structure suitable for home use and high heating efficiency.

In addition , according to the present invention, the gas in the heating chamber circulates through the external circulation path and is heated in the external circulation path in the process. It is possible to provide a steam cooker that does not require an apparatus, has high energy efficiency, and is suitable for home use. Since the gas forms a forced circulation air current, and is ejected into the heating chamber through the blow holes and collides with the object to be heated, a large amount of heat can be quickly given to the object to be heated to perform high-speed cooking.

1 is an external perspective view of a steam cooker according to an embodiment of the present invention. External perspective view of the heating chamber with the door open Basic structure of internal mechanism Top view of heating chamber Vertical section of steam generator Horizontal cross section of steam generator Control block diagram

Hereinafter, an embodiment of a steam cooker according to the present invention will be described with reference to FIGS. 1 is an external perspective view, FIG. 2 is an external perspective view of the heating chamber with the door open, FIG. 3 is a basic structural diagram of the internal mechanism, FIG. 4 is a top view of the heating chamber, and FIG. 5 is a vertical view of the steam generator. 6 is a horizontal sectional view of the steam generator, and FIG. 7 is a control block diagram.

  The steam cooker 1 includes a rectangular parallelepiped cabinet 10. On the front side of the cabinet 10, an operation panel 11 is provided at the top and a door 12 is provided below the operation panel 11. The door 12 pivots in a vertical plane centering on the lower end. By grasping the upper handle 13 and pulling it toward the front, the door 12 changes from the vertical closed state shown in FIG. 1 to the horizontal open state shown in FIG. 90 ° attitude change is possible. Most of the door 12 is a window 14 fitted with heat-resistant glass.

  When the door 12 is opened, two compartments are exposed as seen in FIG. The large compartment on the left is the heating chamber 20, and the small compartment on the right is the water tank chamber 70. The structure of the heating chamber 20 and the water tank chamber 70, and the components attached to these will be described with reference to FIG.

  The heating chamber 20 has a rectangular parallelepiped shape, and the front side facing the door 12 is entirely open. The remaining surface of the heating chamber 20 and the inner surface of the door 12 are formed of a stainless steel plate. Heat insulation measures are taken around the heating chamber 20 and inside the door 12, respectively. A stainless steel plate receiving tray 21 is placed on the floor of the heating chamber 20, and a stainless steel wire rack 22 on which the heated object 90 is placed is placed on the receiving tray 21.

  The gas in the heating chamber 20 (normally, the gas inside the heating chamber 20 is air, but when steam cooking is started, the air is replaced with steam. Therefore, in this specification, “air” is used instead of “air”. Gas)) circulates through the external circuit 30. On the side wall of the heating chamber 20, an airflow control plate 23 (also made of stainless steel plate) that hangs down from the ceiling surface to near the floor surface is disposed in parallel with the heating chamber 20. A gap between the lower end of the airflow control plate 23 and the side wall at the back serves as a downward gas suction port 24 that guides gas to the external circulation path 30.

  The gas sucked from the gas suction port 24 passes through the back of the airflow control plate 23 to the blower device 25 provided at the upper outer portion of the heating chamber 20. The blower 25 includes a centrifugal fan 26, a fan casing 27 that accommodates the centrifugal fan 26, and a motor (not shown) that rotates the centrifugal fan 26. A sirocco fan is used as the centrifugal fan 26. A DC motor capable of high-speed rotation is used as a motor for rotating the centrifugal fan 26.

  The external circulation path 30 connected to the discharge port of the fan casing 27 is configured by combining pipes having a circular cross section. The first pipe 31 protrudes from the fan casing 27 in the horizontal direction. An exhaust port 32 is provided at the end of the first pipe 31. An elbow-shaped second pipe 33 is connected slightly upstream from the exhaust port 32 of the first pipe 31. The horizontal portion of the second pipe 33 enters the upper part of the steam generator 50 (details will be described later) to form a steam suction ejector 34. The discharge end of the second pipe 33 is drawn and becomes an inner nozzle of the vapor suction ejector 34. The outer nozzle 35 of the steam suction ejector 34 projects downstream from the side surface of the steam generator 50, and its discharge end is drawn into a nozzle shape.

  The third pipe 36 of the external circulation path 30 receives the nozzle-shaped discharge end of the outer nozzle 35 downstream of the steam suction ejector 34. One end of the third pipe 36 swells so as to wrap the outer nozzle 35, and a rear-stage ejector 37 is formed here. The nozzle-shaped discharge end of the outer nozzle 35 of the vapor suction ejector 34 serves as an inner nozzle in the rear-stage ejector 37. A bypass path 38 branched from the first pipe 31 is connected to the rear-stage ejector 37. The bypass path 38 is also formed by a pipe having a circular cross section. As shown in FIG. 4, two bypass passages 38 are provided, and the gas flows symmetrically into the rear-stage ejector 37.

  The other end of the third pipe 36 is connected to a subcavity 40 that serves as a gas return port 39 for returning the gas to the heating chamber 20. The subcavity 40 is provided on the ceiling portion of the heating chamber 20 at a location corresponding to the central portion of the ceiling portion. The subcavity 40 has a circular shape in plan view, and a steam heater 41 serving as a gas heating means is disposed inside thereof. The steam heater 41 is a sheathed heater. The bottom surface of the subcavity 40 is formed of a metal panel (which can also be used as the top plate of the heating chamber 20) that serves as the ceiling wall of the heating chamber 20, and the bottom panel 42 has a plurality of blow holes 43 substantially two-dimensionally over the entire panel surface. Alternatively, they are distributed three-dimensionally. The bottom panel 42 is finished in a dark color on both the upper and lower surfaces by a surface treatment such as painting. The bottom panel 42 may be formed of a metal material that changes color to dark when used repeatedly, or may be a dark ceramic molded product.

  A gas discharge port 44 is formed at one corner of the upper portion of the heating chamber 20. An electric damper 45 is disposed at the end of the first pipe 31. The damper 45 selectively closes the exhaust port 32 and the inlet of the second pipe 33.

  Next, the structure of the steam generator 50 will be described with reference to FIGS. The steam generator 50 includes a cylindrical (cylindrical) pot 51 arranged with a center line vertical. The upper part of the pot 51 is closed, and the steam suction ejector 34 is formed as described above.

  The bottom of the pot 51 is formed in a funnel shape, and the drain pipe 52 hangs down from there. The lower end of the drainage pipe 52 is connected to a drainage pipe 53 that is arranged in a shape that is slightly inclined with respect to the horizontal. The end of the drain pipe 53 opens toward the tray 21 through the side wall of the heating chamber 20. A drain valve 54 and a water level sensor 55 are provided in the middle of the drain pipe 52.

  The water in the pot 51 is heated by a steam generating heater 56 provided so as to be in close contact with the outer surface of the pot 51. The steam generating heater 56 is an annular sheathed heater. The heat transfer unit 60 is disposed inside the pot 51 so as to be approximately the same height as the steam generating heater 56.

  The heat transfer unit 60 includes a ring 61 that is in close contact with the inner surface of the side wall of the pot 51, and a plurality of fins 62 that are radially arranged inside the ring 61. The ring 61 and the fin 62 are integrated by a technique such as extrusion, welding, or brazing. The ring 61 and the fin 62 have a predetermined length in the axial direction of the pot 51.

  The pot 51 is supplied with water through a water supply pipe 63. The water supply pipe 63 extends into the pot 51 from near the bottom of the pot 51 and then extends between the fins 62 from the bottom to the top. The upper end of the water supply pipe 63 protrudes slightly above the upper edge of the fin 62. As can be seen in FIG. 6, when the fins 62 are regarded as wheel spokes, a water supply pipe 63 is disposed at a position serving as a hub. The end surface of each fin 62 is brought into contact with the outer surface of the water supply pipe 63, and heat is transferred to the water supply pipe 63 through the fin 62.

  The pot 51, the heat transfer unit 60, and the water supply pipe 63 are formed of a metal that is a good heat conductor. As the metal, copper or aluminum having good thermal conductivity is suitable. However, in the case of copper or a copper alloy, since patina is generated, it is possible to use stainless steel which is slightly inferior in heat conductivity but is not concerned about patina.

  A funnel-shaped receiving port 64 is formed at the end of the water supply pipe 63. A cleaning pipe 65 is connected to a position slightly downstream from the receiving port 64. The cleaning pipe 65 is connected to the drain pipe 53 via the cleaning valve 66.

  In addition to the cleaning pipe 65, an inverted J-shaped drop forming pipe 67 is also connected to the water supply pipe 63. The other end of the drop forming pipe 67 is connected to the drain pipe 53.

  A rectangular parallelepiped water tank 71 is inserted into the water tank chamber 70. An elbow-shaped water supply pipe 72 extending from the water tank 71 is connected to the receiving port 64 of the water supply pipe 63. The pump 73 pumps the water in the water tank 71 through the water supply pipe 72. The pump 73 includes a pump casing 74 formed at the base of the water supply pipe 72, an impeller 75 housed in the pump casing 74, and a motor 76 that transmits power to the impeller 75. The motor 76 is fixed to the cabinet 10 side, and is electromagnetically coupled to the impeller 75 when the water tank 71 is set at a predetermined position.

  A trough-shaped rail 77 that supports the water tank 71 is fixed to the floor surface of the water tank chamber 70 (see FIG. 2). The tank mounting surface of the rail 77 is at the same height as the inner surface of the door 12 that opens horizontally. Therefore, the user can smoothly set the water tank 71 at a predetermined position in the water tank chamber 70 by placing the water tank 71 on the horizontal door 12 and pushing it toward the rail 77. it can. On the contrary, if the door 12 is opened horizontally and the water tank 71 is pulled out, the water tank 71 coming out of the water tank chamber 70 is supported by the door 12 as it is. Therefore, there is no need to pull out the water tank 71 while supporting it by hand.

  It is the control device 80 shown in FIG. 7 that controls the operation of the steam cooker 1. The control device 80 includes a microprocessor and a memory, and controls the steam cooker 1 according to a predetermined program. The control status is displayed on the display unit in the operation panel 11. An operation command is input to the control device 80 through various operation keys arranged on the operation panel 11. The operation panel 11 is also provided with a sound generator that produces various sounds.

  In addition to the operation panel 11, the blower 25, the steam heater 41, the damper 45, the drain valve 54, the water level sensor 55, the steam generation heater 56, the cleaning valve 66, and the pump 73 are connected to the control unit 80. In addition, a water amount sensor 81 for measuring the amount of water in the water tank 71, a temperature sensor 82 for measuring the temperature in the heating chamber 20, and a humidity sensor 83 for measuring the humidity in the heating chamber 20 are connected.

  The operation of the steam cooker 1 is as follows. First, the water tank 71 is pulled out from the water tank chamber 70, and water is poured into the tank through a water supply port (not shown). The fully filled water tank 71 is pushed into the water tank chamber 70 and set at a predetermined position. After confirming that the tip of the water supply pipe 72 is firmly connected to the receiving port 64 of the water supply pipe 63, the power key in the operation panel 11 is pressed to turn on the power. Then, the motor 76 of the pump 73 rotates and water supply to the steam generator 50 starts. At this time, the drain valve 54 and the cleaning valve 66 are closed.

  Water overflows like a fountain from the tip of the water supply pipe 63 and falls to the bottom of the pot 51 while wetting the fins 62 of the heat transfer unit 60. And it accumulates from the bottom of the pot 51. When the water level sensor 55 detects that the water level has reached the middle of the length of the heat transfer unit 60, the water supply is temporarily stopped there. The water level in the pipe on the inlet side of the drop forming pipe 67 also reaches the same level as the pot 51.

  After a predetermined amount of water is put in the pot 51 in this way, energization of the steam generating heater 56 is started. The steam generating heater 56 heats the water in the pot 51 through the side wall of the pot 51. When the side wall of the pot 51 is heated, the heat is transferred to the heat transfer unit 60 and is transferred from the heat transfer unit 60 to water. Since the height at which the steam generating heater 56 is placed and the height at which the heat transfer unit 60 is placed substantially coincide with each other, heat is transferred straight from the steam generating heater 56 to the heat transfer unit 60, and heat transfer efficiency is good.

  The heat transfer unit 60 in which the plurality of fins 62 are arranged radially has a wide heat transfer area, and the water in the pot 51 is quickly heated. Moreover, since the fins 62 arranged radially support the pot 51 from the inside like a spoke of a wheel, the strength of the steam generator 50 is increased.

  Simultaneously with the energization of the steam generating heater 56, the energization of the blower 25 and the steam heater 41 is also started. The blower 25 sucks the gas in the heating chamber 20 from the gas suction port 24 and sends the gas to the external circulation path 30. Since the centrifugal fan 26 is used to send out the gas, the flow velocity of the airflow is faster than that of the propeller fan. In addition, since the centrifugal fan 26 is rotated at a high speed by a direct current motor, the flow velocity of the airflow is extremely fast. For this reason, the pipe forming the external circulation path 30 can have a circular cross section and a small diameter. Thereby, the surface area of the external circulation path 30 becomes small compared with the case where the external circulation path 30 is formed by a duct having a rectangular cross section. Therefore, although the hot gas passes through the inside, the heat dissipation from the external circulation path 30 is reduced, the ratio of the amount of heat dissipated without being used for cooking is reduced, and the energy efficiency of the steam cooker 1 is reduced. improves. Even when the external circulation path 30 is wound with a heat insulating material, the amount of the heat insulating material is small.

  At this time, the damper 45 opens the inlet of the second pipe 33 of the external circulation path 30 and closes the exhaust port 32. The gas enters the second pipe 33 from the first pipe 31, and further enters the subcavity 40 that is the gas return port 39 through the third pipe 36. Then, after being heated by the steam heater 41 in the subcavity 40, it is ejected downward from the fumarole 43.

  When the water in the pot 51 boils, saturated steam at 100 ° C. and 1 atm is generated. Saturated steam is sucked into the circulating airflow passing through the external circulation path 30 at the steam suction ejector 34. Since the ejector structure is used, saturated steam is quickly sucked up and sucked out. Due to the ejector structure, no pressure is applied to the steam generator 50 and the release of saturated steam is not hindered.

  In the rear-stage ejector 37, the gas is sucked from the bypass path 38 into the airflow blown from the outer nozzle 35 of the steam suction ejector 34. The pressure loss of the circulation system is reduced by the presence of the bypass passage 38 through which the gas flows in by bypassing the vapor suction ejector 34, and the centrifugal fan 26 can be driven efficiently. The saturated vapor mixed gas that exits the rear ejector 37 enters the subcavity 40 at a high speed.

  The saturated vapor mixed gas that has entered the subcavity 40 is heated to 300 ° C. by the steam heater 41. At this point, the gas becomes superheated steam. The steam expands as the temperature rises and ejects vigorously from the fumarole hole 43.

  The gas that forms the airflow blown down at the center of the heating chamber 20 (to-be-heated object placement portion) rises on the outside thereof and forms convection in the heating chamber 20. Then, the gas is sucked again from the gas suction port 24, and returns to the subcavity 40 through the external circulation path 30. In this way, the gas in the heating chamber 20 repeats circulation such that it exits the external circulation path 30 and returns to the heating chamber 20.

  As time passes, the proportion of vapor in the gas increases. The surplus gas is discharged from the gas discharge port 44 to the outside of the heating chamber 20. If the gas containing steam is discharged into the cabinet 10 as it is, dew condensation occurs in the cabinet 10 and undesired results such as generation of rust and electric leakage are caused. If it is discharged as it is outside the cabinet 10, it will cause condensation on the wall of the kitchen. Therefore, the vapor is discharged through the maze-shaped dew passage (not shown) provided in the cabinet 10 and then the gas is discharged to the outside of the cabinet 10 to avoid the above problem. The water flowing down from the dew passage is guided to the tray 21 and treated with water generated for other reasons after the cooking is completed.

  When the ejection of gas containing superheated steam begins, the temperature in the heating chamber 20 rises rapidly. When the temperature sensor 82 detects that the temperature in the heating chamber 20 has reached the cookable region, the control device 80 displays a message to that effect on the operation panel 11 and sounds a signal. A user who knows that cooking is possible by sound and display opens the door 12 and puts the object 90 to be heated into the heating chamber 20.

  When the door 12 is about to be opened, the control device 80 switches the posture of the damper 45, closes the inlet of the second pipe 33, and opens the exhaust port 32. The gas in the heating chamber 20 is sucked by the blower 25 and discharged from the exhaust port 32. When the inlet of the second pipe 33 is closed, the superheated steam is not ejected from the fusible holes 43, so that the user is not burned on the face or hands. The damper 45 keeps the posture of opening the exhaust port 32 and closing the inlet of the second pipe 33 while the door 12 is open.

  If the air blower 25 is stopped and exhausted from the exhaust port 32, a time lag occurs until the steady air blow state is reached. In the present invention, the air blower 25 is already in operation and the time lag is reached. Is zero. Further, since the circulating airflow that has flowed around the heating chamber 20 and the external circulation path 30 becomes the exhaust airflow from the exhaust port 32 as it is, there is no time lag for changing the direction of the airflow. Thereby, the vapor | steam in the heating chamber 20 is discharged | emitted without delay, and time until opening of the door 12 is attained can be shortened.

  When the steam is discharged from the heating chamber 20, the second pipe 33 is closed and the supply of steam to the heating chamber 20 is stopped. For this reason, the vapor pressure or the vapor amount inside the heating chamber 20 quickly decreases, and the time until the door 12 can be opened is further shortened.

  The situation that the user is about to open the door 12 can be notified to the control device 80 as follows, for example. That is, a latch for keeping the door 12 closed is provided between the cabinet 10 and the door 12, and a latch lever for unlocking the latch is provided so as to be exposed from the handle 13. A switch that opens and closes in response to the movement of the latch or the latch lever is arranged inside the door 12 or the handle 13, and when the user performs an unlocking operation by grasping the handle 13 and the latch lever, the switch switches to the control device 80. Make sure the signal is sent.

  Like the gas discharged from the gas discharge port 44, the gas discharged from the exhaust port 32 contains a large amount of vapor, and it is problematic to discharge it as it is. For this reason, the gas discharged from the exhaust port 32 is also released outside the cabinet 10 after removing moisture through a maze-shaped condensation passage provided in the cabinet 10. The water flowing down from the dew passage is guided to the tray 21 and treated with water generated for other reasons after the cooking is completed.

  When the article to be heated 90 is set on the rack 22 and the door 12 is closed, the damper 45 returns to the posture of opening the inlet to the second pipe 33 and closing the exhaust port 32. Thereby, the ejection of superheated steam from the fumarole 43 is resumed, and cooking of the article 90 to be heated is started.

  The superheated steam heated to about 300 ° C. and blown down from the blow hole 43 collides with the object to be heated 90 and transfers heat to the object to be heated 90. In this process, the steam temperature is reduced to about 250 ° C. Further, the superheated steam that has come into contact with the surface of the object to be heated 90 releases latent heat when dew condensation occurs on the surface of the object to be heated 90. This also heats the article 90 to be heated.

  Since the object to be heated 90 is heated while circulating the gas in the heating chamber 20, the energy efficiency of the steam cooker 1 is high. Since the gas containing superheated steam is ejected downward from the plurality of jet holes 43 that are two-dimensionally or three-dimensionally distributed over the entire surface of the bottom panel 42 of the subcavity 40, the upper surface of the object 90 to be heated Superheated steam collides with the whole. Combined with the collision of the superheated steam with the object 90 to be heated and the large area of the collision, the heat contained in the superheated steam is quickly and efficiently transmitted to the object 90 to be heated. Further, the gas that has entered the subcavity 40 is heated by the steam heater 41 and expands, whereby the momentum of the jet increases and the collision speed with the object 90 to be heated increases. Thereby, the to-be-heated object 90 is heated more rapidly.

  Since the centrifugal fan 26 can generate a higher pressure than the propeller fan, the injection force from the blow hole 43 can be increased. As a result, the injection distance of the superheated steam is extended, and the object to be heated 90 can be heated strongly. The centrifugal fan 26 is rotated at a high speed by a direct current motor and blows powerfully, so that the above-mentioned effect appears more remarkably. The strong blowing power of the blower device 25 is very useful for quickly exhausting air from the exhaust port 32 when the door 12 is opened.

  The superheated steam blown downward turns the direction upward after colliding with the object 90 to be heated. Since steam, especially superheated steam, is lighter than air, it will turn in this way in a natural way, which causes convection inside the heating chamber 20. By this convection, while maintaining the temperature in the heating chamber 20, the heated object 90 can continue to collide with the superheated steam that has just been heated in the subcavity 40, and heat can be rapidly and rapidly applied to the heated object 90. Can be given.

  The gas suction port 24 is in the lower part of the side wall of the heating chamber 20 (below the height of the object to be heated 90), and the vapor ejected from the air hole 43 advances straight without being deflected and hits the object to be heated 90. Sucked into. For this reason, the heat transfer capability to the article 90 to be heated is maintained at a high level. Moreover, since the vapor | steam ejected from the upper side is sucked into the lower part of the side wall, when the door 12 is opened, the vapor is hardly pushed toward the user, and safety is high.

  Since the gas suction port 24 faces downward, a lateral force is less likely to act on the ejected steam, and steam deflection can be further prevented. Moreover, even if oil repels from the surface of the article 90 to be heated, it is difficult for the oil to be sucked into the gas suction port 24, and the air blower 25 and the inner surface of the external circulation path 30 do not need to be stained.

  The bottom panel 42 of the subcavity 40 absorbs radiant heat emitted from the steam heater 41 well because the top surface is dark. Radiant heat absorbed by the bottom panel 42 is radiated and radiated to the heating chamber 20 from the bottom surface of the bottom panel 42, which is also dark. For this reason, the temperature rise of the subcavity 40 and its outer surface is suppressed, safety is improved, and the radiant heat of the steam heater 41 is transmitted to the heating chamber 20 through the bottom panel 42, so that the heating chamber 20 is heated more efficiently. . The planar shape of the bottom panel 42 may be circular, or may be a rectangle similar to the planar shape of the heating chamber 20. Further, the bottom panel of the subcavity 40 may be formed on the ceiling wall of the heating chamber 20 to share the members.

  If the heated object 90 is a liquid contained in a container, it may boil and partly spill out. The spilled liquid is also received by the tray 21. Anything that has dropped or spilled from the object to be heated 90 is received by the tray 21 and waits for processing after cooking.

  If steam is continuously generated by the steam generator 50, the water level in the pot 51 is lowered. When the water level sensor 55 detects that the water level has dropped to a predetermined level, the control device 80 restarts the operation of the pump 73. The pump 73 pushes up the water in the water tank 71 and replenishes the evaporated water. When passing through the water supply pipe 63, heat of the steam generating heater 56 is transmitted to the makeup water through the fins 62 of the heat transfer unit 60. As a result, the makeup water is preheated and the time to reach the boiling point is shortened.

  Further, the makeup water that spills from the upper end of the water supply pipe 63 is poured onto the portion of the fin 62 exposed on the water surface. Since the exposed portion of the fin 62 on the water surface is hotter than the portion immersed in the water, the water poured into the fin 62 boils and evaporates instantaneously, increasing the vapor pressure inside the pot 51. . For this reason, the steam is strongly ejected from the outer nozzle 35 and flows into the subcavity 40, and the ejection of the superheated steam from the fusible holes 43 is energized. Therefore, powerful injection of superheated steam occurs every time water is supplied.

  When the water level sensor 55 detects that the water level in the pot 51 has risen to a predetermined level, the control device 80 stops the operation of the pump 73. In this way, the pump 73 performs a water supply operation intermittently during the cooking period. The temperature of the exposed portion of the fin 62 on the water surface is once lowered when water is poured, but when the water is not poured thereafter, the temperature is recovered. As a result, each time new water is poured, the water rapidly evaporates, increasing the jet power of superheated steam.

  Although one embodiment of the present invention has been described above, various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Steam cooker 20 Heating chamber 21 Sauce tray 22 Rack 24 Gas inlet 25 Blower 26 Centrifugal fan 30 External circulation path 34 Steam suction ejector 37 Subsequent ejector 38 Bypass path 39 Gas return port 40 Subcavity 41 Steam heating heater 43 Fumarole 50 Steam generator

Claims (7)

A heating chamber for storing an object to be heated ; a steam generation container for supplying steam to the heating chamber; and a water supply unit for supplying water to the steam generation container,
The steam generation container has a heat dissipating fin provided inside and exposed at least partially on the water surface, and a heater for heating the steam generation container,
The heater is disposed outside the internal space of the steam generating container, and the heat radiating fins are attached to the inner wall surface of the steam generating container,
The said water supply part supplies water to the vicinity of the said radiation fin from the position above the bottom part of the said steam generation container, The steam cooker characterized by the above-mentioned . The steam cooker according to claim 1, wherein the radiating fin is attached in the vicinity of the heater . The steam cooker according to claim 1 or 2, wherein the radiating fin is formed in a flat plate shape . The steam cooker according to any one of claims 1 to 3, wherein a part of the heater is disposed above the other part . 5. The steam according to claim 4, wherein a part of the heater is disposed above the water surface of the steam generation container and the other part of the heater is disposed below the water surface of the steam generation container. Cooking device.   An external circulation path for injecting the gas sucked from the heating chamber through the gas suction port into the heating chamber through the blow hole, and a blower for forming an air flow from the gas suction port to the blow hole in the external circulation path. A steam cooker according to any one of claims 1 to 5, further comprising a gas heater that heats the gas passing through the external circulation path. The steam cooker according to any one of claims 1 to 6, wherein the water supply section intermittently performs a water supply operation.

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