JP4290045B2 - Steam cooker - Google Patents

Description

  The present invention relates to a steam cooker that heats and cooks an object to be heated by spraying steam onto the object to be heated in a heating chamber.

2. Description of the Related Art Various types of heating cookers that heat and cook a cooked food in a heating chamber of a cooker body have been proposed (see, for example, Patent Document 1). In such a heating cooker, water vapor generated during cooking may be condensed to form water droplets (dew) and adhere to the door of the heating chamber, and the water droplets may fall on the floor. Therefore, in the heating cooker described in Patent Document 1, a water drop receiver is provided in the lower front portion of the cooker body, and water drops that adhere to the door and fall are received by the water drop receiver. This prevents the water droplets from falling onto the floor.
Japanese Utility Model Publication No. 3-115318

  By the way, in recent years, various steam cookers have been proposed in which steam generated by a steam generating device (for example, a pot) is supplied to a heating chamber to cook an object to be heated in the heating chamber. Also in this steam cooker, the steam supplied into the heating chamber is condensed to form water droplets and adheres to the door of the heating chamber, so that the water droplet receiving portion that receives the water droplets to prevent the water droplets from falling onto the floor surface It is considered necessary to provide

  However, since the steam cooker uses steam to heat the object to be heated, the amount of water droplets adhering to the door due to condensation is inevitably larger than in the case of the heat cooker. Therefore, if the water droplet receiver of the conventional cooking device is simply applied to the steam cooker, the water droplet receiver may become full of water and overflow to the outside. In order to avoid such a situation, the user needs to frequently discard the water in the water droplet receiving section, which causes a problem that the burden on the user increases.

  There is a case where a drainage tank for receiving water drained from the inside of the steam generator is provided at the lower part of the main body of the steam cooker. Since the water stored in the drainage tank is water that should be discarded in the future in the same manner as the water stored in the water droplet receiving part, it is not necessary to distinguish these waters and store them in each part. Therefore, in a steam cooker having a drain tank, it is considered that the above problem can be solved if the water in the water droplet receiving part can be treated using this drain tank.

  The present invention has been made to solve the above-described problems, and its purpose is to dispose of water in the water droplet receiver by treating the water in the water droplet receiver using a drainage tank. It is providing the steam cooker which can reduce the processing burden of.

The steam cooker of the present invention generates steam with water supplied from a water supply tank, supplies steam to a heating chamber that heats an object to be heated (for example, a pot), and water drained from the steam generating means. A drain tank for storing water, a water drop receiver that is provided integrally with the drain tank, and that receives water droplets attached to the door of the heating chamber by condensation of steam supplied to the heating chamber, the water drop receiver and the drain A partition plate provided between the tank and having an opening , wherein the water drop receiving portion and the drainage tank communicate with each other through the opening .

  According to said structure, a vapor | steam production | generation means produces | generates a vapor | steam with the water supplied from a water supply tank, and supplies it to a heating chamber. As the steam condenses, water droplets adhere to the door of the heating chamber, but the water droplets fall and accumulate in the water droplet receiver. On the other hand, the water inside the steam generation means is drained into the drainage tank, for example, when a predetermined condition is satisfied (for example, when a predetermined time has elapsed after the start of water supply to the steam generation means). Thereby, accumulation and adhesion of scale can be suppressed inside the steam generating means, and the inside can be kept hygienic.

  Here, since the water droplet receiver and the drain tank are in communication, even if the amount of water droplets received by the water droplet receiver increases and the amount of water in the water droplet receiver increases, the water is still in the drain tank. Flowing into. This eliminates the need for the user to frequently discard the water in the water droplet receiver, thereby reducing the processing burden on the user.

It can be discarded water droplet receiving portion and drainage tank and is integral structure der Runode, and water collected in the water drops receiving unit, collected in the drainage tank and the water at one time. Therefore, for example, compared to the case where the water droplet receiving portion and the drain tank are separated and configured, the number of times that unnecessary water is discarded can be greatly reduced, and the processing burden on the user can be surely reduced. .

The steam cooker of this invention WHEREIN: The structure where the capacity | capacitance of the said drainage tank is larger than the capacity | capacitance of the said water supply tank may be sufficient.

  If the capacity of the drainage tank is larger than the capacity of the water supply tank, even if all the water in the water supply tank is supplied to the steam generator and all the water is drained to the drainage tank due to some abnormality, all the water is drained into the drainage tank. Can be stored. Therefore, it is possible to avoid a situation in which water in the cooker overflows to the outside when assuming the worst case such as equipment failure.

  According to the present invention, the amount of water droplets received by the water droplet receiver increases, and even if the amount of water in the water droplet receiver increases, the water flows toward the drainage tank. It is not necessary to throw away water frequently, and the processing burden on the user can be reduced.

  An embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is an external perspective view of the steam cooker 1 of the present embodiment, FIG. 2 is an external perspective view of the steam cooker 1 with the door 11 of the heating chamber 20 open, and FIG. 4 is a front view of the steam cooker 1 with the door 11 of the chamber 20 removed, FIG. 4 is an explanatory view showing the basic structure of the internal mechanism of the steam cooker 1, and FIG. It is explanatory drawing which shows the basic structure of the internal mechanism of the steam cooker 1 seen from the direction, FIG. 6 is a top view of the heating chamber 20, and FIG. 7 is a block diagram of the control device 80 of the steam cooker 1. 8 is an explanatory diagram showing a state different from FIG. 4 in the same basic structure diagram as FIG. 4, and FIG. 9 is an explanatory diagram showing a state different from FIG. 5 in the same basic structure diagram as FIG. FIG. 10 is a top view of the bottom panel 42 of the subcavity 40, and FIG. 11 is a drain tank of the steam cooker 1. 4 a schematic configuration in the vicinity is a cross-sectional view schematically showing.

  The steam cooker 1 includes a rectangular parallelepiped cabinet 10. A door 11 is provided on the front surface of the cabinet 10. The door 11 is for opening and closing the opening of the heating chamber 20, and is pivotally supported by the cabinet 10 so as to rotate in a vertical plane with the lower end as a center. Therefore, by gripping the upper handle 12 and pulling it forward, the posture of the door 11 can be changed by 90 ° from the vertical closed state shown in FIG. 1 to the horizontal open state shown in FIG. The door 11 has a configuration in which a left portion 11L and a right portion 11R, which are finished with a metal decorative plate, are symmetrically arranged on the left and right sides of a central portion 11C having a see-through portion fitted with heat-resistant glass. An operation panel 13 is provided on the right portion 11R. The operation panel 13 is an operation unit for setting operation conditions of the device.

  When the door 11 is opened, the front surface of the cabinet 10 is exposed as shown in FIG. The heating chamber 20 described above is provided at a location corresponding to the central portion 11 </ b> C of the door 11. A water tank chamber 70 is provided at a location corresponding to the left side portion 11L of the door 11. The opening corresponding to the right portion 11R of the door 11 is not particularly provided with an opening, but the control board is disposed inside the portion.

  The heating chamber 20 is a room for heating the article to be heated F, and is formed in a rectangular parallelepiped shape. And the front side facing the door 11 of the heating chamber 20 is a full opening. The remaining surface of the heating chamber 20 is formed of a stainless steel plate. Heat insulation measures are taken around the heating chamber 20. 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 object to be heated F is placed is placed on the receiving tray 21.

  Steam in heating chamber 20 (normally, the gas in heating chamber 20 is air, but when steam cooking is started, air is replaced by steam. In this specification, the gas in heating chamber 20 is steam. The explanation will be made assuming that it has been replaced with (3)), and circulates through the external circulation path 30 shown in FIG.

  The starting end of the external circulation path 30 is a suction port 28 formed at one corner of the upper side wall of the heating chamber 20. In this embodiment, as can be seen in FIG. 3, the suction port 28 is arranged in the upper left corner of the side wall. The suction port 28 has a plurality of horizontal slits arranged one above the other, and the upper slit is longer and shorter as it goes downward to form a right triangle opening as a whole. The right angle of the right triangle is aligned with the angle of the back side wall of the heating chamber 20. That is, the opening degree of the suction port 28 is larger as it is closer to the upper side of the side wall at the back of the heating chamber 20, and is larger as it is closer to the left side.

  Following the suction port 28 is a blower 25 that forms an airflow flowing through the external circulation path 30. The blower device 25 is disposed close to the outer surface of one side wall of the heating chamber 20. As one side wall, the back side wall of the heating chamber 20 is selected. The blower 25 includes a centrifugal fan 26, a fan casing 27 that accommodates the centrifugal fan 26, and a motor 29 that rotates the centrifugal fan 26. As the centrifugal fan 26, a sirocco fan can be used. As the motor 29, a DC motor capable of high speed rotation can be used. The fan casing 27 is fixed to an outer surface of the rear side wall of the heating chamber 20 at a lower right position of the suction port 28, and has an air inlet and an air outlet.

  Following the blower 25 in the external circulation path 30 is a steam generator 50. Details of the steam generator 50 will be described later. The steam generator 50 is disposed in the vicinity of the outer surface of the side wall at the back of the heating chamber 20, similarly to the blower device 25. However, while the blower 25 is disposed at a position on the left side of the heating chamber 20, the steam generator 50 is on the center line of the heating chamber 20.

  Thus, since the main components of the external circulation path 30 such as the suction port 28, the blower 25, and the steam generation apparatus 50 are gathered around the back side wall, which is one side wall of the heating chamber 20, the external circulation path 30 The length is shortened. Thereby, the pressure loss of the external circulation path 30 becomes low, and the ventilation efficiency of the external circulation path 30 improves. Further, since the heat radiation area of the external circulation path 30 is reduced, heat loss is also reduced. Together, these improve energy efficiency in circulating the steam through the external circulation path 30. Furthermore, since a large space is not required to arrange the external circulation path 30, the cabinet 10 can be downsized.

  In the external circulation path 30, a section from the outlet of the fan casing 27 to the steam generator 50 is constituted by a duct 31. The section after exiting the steam generator 50 is constituted by a duct 35. The duct 35 is connected to a subcavity 40 provided adjacent to the heating chamber 20. The airflow flowing through the external circulation path 30 returns to the heating chamber 20 through the subcavity 40.

  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 when seen in a plan view. The subcavity 40 has a circular shape in plan view, and a steam heater 41 serving as a steam heating means is disposed inside the subcavity 40. The steam heater 41 includes a main heater and a sub heater, both of which are configured as sheathed heaters.

  When comparing the calorific value of the main heater and the calorific value of the sub heater, the former is larger than the latter. The power consumption is, for example, 1000 W for the main heater and 300 W for the sub heater. In addition, this numerical value is only one suitable example, and the content of invention is not necessarily limited by this. The main heater and the sub heater can be energized one by one, or both can be energized at the same time.

  An opening having the same size as the subcavity 40 is formed in the ceiling portion of the heating chamber 20, and a bottom panel 42 constituting the bottom surface of the subcavity 40 is fitted therein. A plurality of upper fusible holes 43 are formed in the bottom panel 42. Each of the upper blow holes 43 is a small hole that is directed right below, and is distributed over almost the entire panel. The upper blow holes 43 are two-dimensionally distributed in a planar manner, but may be formed by providing unevenness on the bottom panel 42 and adding a three-dimensional element.

  The bottom panel 42 is finished in a dark color by surface treatment such as painting on both the upper and lower surfaces. In addition, you may shape | mold the bottom panel 42 with the metal raw material which changes to dark color by repeated use. Alternatively, the bottom panel 42 may be formed of a dark-colored ceramic molded product.

  Further, the bottom surface of the subcavity 40 is not constituted by the separate bottom panel 42, but the top plate of the heating chamber 20 can also be used as the bottom surface of the subcavity 40 as it is. In this case, the upper blow hole 43 is provided at a position corresponding to the subcavity 40 in the top plate, and both the upper and lower surfaces thereof are finished in a dark color.

  In this manner, the steam is supplied to the heating chamber 20 through the subcavity 40, so that the distribution of the steam is adjusted in the subcavity 40 and is suitable for cooking the object to be heated F. Steam can be blown. For this reason, compared with simply blowing steam from the external circulation path 30 into the heating chamber 20, the thermal energy of the steam can be effectively used for cooking.

  Small sub-cavities 44 are provided outside the left and right side walls of the heating chamber 20 as shown in FIG. The subcavity 44 is connected to the subcavity 40 by a duct 45 and receives supply of steam from the subcavity 40 (see FIGS. 5 and 6). The duct 45 is constituted by a pipe having a circular cross section. As the duct 45, it is desirable to use a stainless steel pipe.

  In the lower portion of the side wall of the heating chamber 20, a plurality of side blow holes 46 are provided at locations corresponding to the subcavities 44. Each side blow hole 46 is a small hole directed in the direction of the object to be heated F placed in the heating chamber 20, more precisely, below the object to be heated F, and the object to be heated placed on the rack 22. Steam is ejected in the direction of F. The height and direction of the side blow holes 46 are set so that the jetted steam enters under the object to be heated F. Further, the position and / or direction of the side air holes 46 are set so that the steam ejected from the left and right meets under the object F to be heated.

  The side fumarole 46 may be formed in a separate panel, or may be formed in the form of a small hole directly formed in the side wall of the heating chamber 20. This is the same as the case of the upper fumarole 43. However, unlike the case of the subcavity 40, it is not necessary to finish the portion corresponding to the subcavity 44 in a dark color.

  Note that the sum of the area of the left and right side air holes 46 is larger than the area of the upper air holes 43. In order to supply a large amount of steam to the side blow holes 46 having such a large area, a plurality of (four in the figure) ducts 45 are provided for each subcavity 44.

  Next, the structure of the steam generator 50 will be described. The steam generator 50 generates steam by boiling water supplied from water supply means (for example, a water supply pipe 55, a water supply pump 57, a water tank 71, and a water supply pipe 72), which will be described later, and supplies the steam to the heating chamber 20. Steam generating means to be supplied.

  The steam generator 50 includes a cylindrical pot 51 arranged with a center line vertical. The pot 51 has a flat planar contour shape of the side wall constituting the vertical surface, and has an elongated horizontal plane shape, that is, a rectangular shape, an oval shape, or a horizontal sectional shape similar to these. Although the pot 51 is required to have heat resistance, the pot 51 may be formed of any material as long as the condition is satisfied. That is, the pot 51 may be formed of, for example, metal, synthetic resin, or ceramic, or may be formed by combining different materials.

  As shown in FIG. 6, the steam generator 50 is attached such that one flat side surface of the pot 51 is parallel to the inner side wall of the heating chamber 20. If it is this form, even if the width | variety of the space of the outer surface of the heating chamber 20 and the inner surface of the cabinet 10 is narrow, the steam generator 50 can be arrange | positioned. Therefore, the width of the space can be reduced to make the cabinet 10 compact, and the space utilization efficiency in the cabinet 10 can be improved.

  The steam generating heater 52 disposed at the bottom of the pot 51 heats the water in the pot 51. The steam generating heater 52 is constituted by a sheathed heater, and directly heats the water by immersing it in the water in the pot 51. In accordance with the flat shape of the pot 51, the steam generating heater 52 is also bent into a flat horseshoe shape along the inner surface of the pot 51. Similar to the steam heater 41 in the subcavity 40, the steam generating heater 52 is composed of a main heater and a sub heater, with the former disposed outside and the latter disposed inside. The cross-sectional diameters are also different, the main heater is thick and the sub-heater is thin.

  When placing a sheathed heater in a surface with the same area, it is more flat like a horseshoe shape in a rectangular or oval surface than in a case in which a sheathed heater bent into a circle is placed in a circular surface. The length of the sheathed heater is longer in the case where the sheathed heater bent into a proper shape is placed. In other words, the length of the sheathed heater for the same amount of water is greater when a sheathed heater bent like a horseshoe is placed in a pot with an elongated horizontal sectional shape than when a sheathed heater bent in a circle is placed in a pot with a circular section. The ratio is increased, the surface area of the sheathed heater is increased, and a large amount of electric power can be input, so that heat can be easily transferred to water. For this reason, in the steam generator 50 of this embodiment, water can be heated rapidly.

  As in the case of the steam heater 41, when comparing the heat generation amount of the main heater and the heat generation amount of the sub heater of the steam generation heater 52, the former is larger than the latter. The power consumption is 700 W for the main heater and 300 W for the sub heater, for example. In addition, this numerical value is only one suitable example, and the content of invention is not necessarily limited by this. The main heater and the sub heater can be energized one by one, or both can be energized at the same time.

  A steam suction part is formed in the upper part of the pot 51 to allow steam to be taken into the circulating airflow flowing through the external circulation path 30. The steam suction part is constituted by a steam suction ejector 34 formed so as to pass from one flat side surface of the pot 51 to the other flat side surface. By providing the steam suction portion in this way, a new steam can be taken into the circulating airflow while maintaining the circulating airflow. Further, by using the steam suction ejector 34, the steam can be efficiently sucked and taken into the circulating airflow. Note that a total of three steam suction ejectors 34 are arranged in parallel and parallel to each other at the same height level at a predetermined interval.

  Each vapor suction ejector 34 includes an inner nozzle and an outer nozzle surrounding the discharge end. The steam suction ejector 34 extends in a direction intersecting the axis of the pot 51. In the present embodiment, the crossing angle is a right angle, that is, the steam suction ejector 34 is horizontal. A duct 31 is connected to the inner nozzle, and a duct 35 is connected to the outer nozzle. The vapor suction ejector 34 is substantially the same height as the subcavity 40, and the duct 35 extends substantially horizontally. Thus, by connecting the steam suction part and the subcavity 40 linearly by the horizontal duct 35, the external circulation path 30 after passing the steam suction part can be made the shortest path.

  The external circulation path 30 is divided into three shunts including three steam suction ejectors 34 and a duct 35 subsequent thereto after the steam generator 50. For this reason, the pressure loss of the passage is reduced, the circulation steam amount can be increased, and the steam can be quickly mixed with the gas flowing through the external circulation path 30.

  Thus, the three steam suction ejectors 34 provided on the upper portion of the pot 51 constitute a steam suction portion that is flat in the vertical direction and covers a wide area, so that the steam suction area is widened and the generated steam is evenly distributed. While being sucked uniformly, the sucked steam is quickly sent out, and the steam generation capability of the steam generator 50 is further improved. In addition, since three steam suction ejectors 34 are arranged in parallel at the same height level, a large amount of steam can be transported even when there is no space in the height direction.

  Returning to FIG. 4, the description will be continued. The bottom of the pot 51 is formed in a funnel shape, and a drain pipe 53 hangs from the funnel. A drain valve 54 is provided in the middle of the drain pipe 53. The lower end of the drain pipe 53 is bent at a predetermined angle toward the bottom of the heating chamber 20. Here, the drain pipe 53 and the drain valve 54 function as drain means for draining the water inside the steam generating means (especially the pot 51 of the steam generator 50) described above.

  A drainage tank 14 is disposed under the heating chamber 20 so that the cabinet 10 can be taken in and out from the front side (opening side of the heating chamber 20). The drainage tank 14 is a container for storing water drained by the drainage means from the steam generator 50 (particularly the pot 51), and receives the end of the drainage pipe 53. As shown in FIG. 11, when the drain tank 14 is completely attached to the steam cooker 1, the rear end face (the end face opposite to the door 11) of the drain tank 14 is provided below the cabinet 10. The water that contacts the contact portion 15 and is drained from the drain pipe 53 is stored in the drain tank 14. If the drainage tank 14 is pulled out, the water accumulated in the inside can be discarded.

  Here, drainage control of the water in the pot 51 to the drainage tank 14 is performed by the control device 80 (see FIG. 7). For example, (1) when the residence time of water in the pot 51 reaches a predetermined time, (2) when the total time from the start of water supply to the pot 51 by the water supply means reaches a predetermined time, (3) water supply means (4) When the total water supply to the pot 51 by the water supply means reaches a predetermined time, (5) A drainage instruction is input by the operation panel 13 The control device 80 drains the water in the pot 51 to the drainage tank 14 when a predetermined condition such as when is satisfied. Thereby, impurities (for example, Ca and Mg) contained in the water in the pot 51 can be prevented from accumulating and adhering to the inside of the pot 51 as a scale, and the inside of the pot 51 can be kept hygienic. . Moreover, it is possible to prevent the drainage from the pot 51 from being clogged due to the adhesion of the scale inside the pot 51. Furthermore, it is possible to prevent the decayed water from remaining in the pot 51.

  A water drop receiver 16 is provided below the door 11. The water droplet receiver 16 receives water droplets attached to the door 11 due to condensation of steam supplied to the heating chamber 20. By providing such a water droplet receiver 16, it is possible to prevent water droplets adhering to the door 11 from falling to the floor.

  Note that the present embodiment is characterized in that the water droplet receiver 16 is communicated with the drainage tank 14, which will be described later.

  Water is supplied to the pot 51 shown in FIG. 4 through a water supply channel. The water supply path is constituted by a water supply pipe 55 that connects the water tank 71 and the drain pipe 53. The water supply pipe 55 is connected to the drain pipe 53 at a location above the drain valve 54. The water supply pipe 55 drawn out from the connection point with the drain pipe 53 is once lifted into an inverted U shape and then lowered. A water supply pump 57 is installed in the middle of the descending portion. The water supply pipe 55 communicates with a horizontal funnel-shaped receiving port 58. The horizontal communication pipe 90 connects the water supply pipe 55 and the receiving port 58.

  A pot water level sensor 56 is arranged inside the pot 51. The pot water level sensor 56 is positioned slightly higher than the steam generating heater 52.

  A rectangular parallelepiped water tank 71 (water supply tank) is inserted into the water tank chamber 70. A water supply pipe 72 extending from the bottom of the water tank 71 is connected to the receiving port 58. The water supply pipe 55, the water supply pump 57, the water tank 71, and the water supply pipe 72 described above function as water supply means for supplying water to the steam generation means (steam generation device 50).

  When the water tank 71 is pulled out from the water tank chamber 70 and the water supply pipe 72 is separated from the receiving port 58, the water in the water tank 70 and the water on the water supply pipe 55 side will flow out as they are. In order to prevent this, coupling plugs 59 a and 59 b are attached to the receiving port 58 and the water supply pipe 72. In the state where the water supply pipe 72 is connected to the receiving port 58 as shown in FIG. 4, the coupling plugs 59 a and 59 b are connected to each other so that water can pass therethrough. When the water supply pipe 72 is pulled away from the receiving port 58, the coupling plugs 59a and 59b are closed, and the outflow of water from the water supply pipe 55 and the water tank 71 is stopped.

  A water supply pipe 55, a pressure detection pipe 91, and a pressure release pipe 92 are connected to the communication pipe 90 in order from the receiving port 58. A water level sensor 81 is provided at the upper end of the pressure detection pipe 91. The water level sensor 81 measures the water level in the water tank 71. The upper end of the pressure release pipe 92 bends horizontally and is connected to an exhaust passage through which steam escapes from the heating chamber 20.

  A duct 93 constitutes the exhaust path. The duct 93 extends from the side wall of the heating chamber 20 and gradually increases in height, and finally communicates with the outside of the machine, that is, outside the cabinet 10. The entrance of the duct 93 in the heating chamber 20 is opened above the tray 21. For this reason, if there is a liquid flowing in the duct 93 in the direction opposite to the exhaust, it can be received by the tray 21.

  At least a part of the duct 93 is a heat radiating portion 94. The heat dissipating part 94 is constituted by a metal pipe having a plurality of heat dissipating fins 95 on the outer surface.

  Near the upper end of the duct 93 passes through the side of the duct 31. In this place, a communication path is provided between the duct 31 and the duct 93. A duct 96 constitutes the communication path, and an electric damper 97 is provided therein. The damper 97 closes the duct 96 in a normal state.

  The highest portion of the water supply pipe 55 communicates with the duct 93 through an overflow channel. What constitutes the overflow channel is an overflow pipe 98 having one end connected to the water supply pipe 55 and the other end connected to the upper end horizontal portion of the pressure release pipe 92. The height of the location where the pressure release pipe 92 is connected to the duct 93 is the overflow level. The overflow level is set to be higher than the normal water level in the pot 51 and lower than the steam suction ejector 34.

  The duct 93 is formed in a large cross-sectional area from the connection portion of the overflow pipe 98 and the vicinity of the connection portion of the duct 96 to the open portion to the outside of the machine. This part can be made of synthetic resin.

  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 13. An operation command is input to the control device 80 through various operation keys arranged on the operation panel 13. The operation panel 13 is also provided with a sound generator that produces various sounds.

  In addition to the operation panel 13, the blower 25, the steam heater 41, the damper 97, the steam generation heater 52, the drain valve 54, the pot water level sensor 56, the water supply pump 57, and the water level sensor 81 are connected to the control device 80. . In addition, 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 to the control device 80.

  The operation of the steam cooker 1 is as follows. First, the door 11 is opened, the water tank 71 is pulled out from the water tank chamber 70, and water is poured into the tank from 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 water inlet 58 of the water supply path, the article to be heated F is put into the heating chamber 20 and the door 11 is closed. Then, the power key in the operation panel 13 is pressed to turn on the power, and the operation key group provided in the operation panel 13 is also pressed to select the cooking menu and make various settings.

  When the water supply pipe 72 is connected to the receiving port 58, the water tank 71 and the pressure detection pipe 91 are in communication with each other, and the water level sensor 81 detects the water level in the water tank 71. If there is a sufficient water level (water volume) to perform the selected cooking menu, the controller 80 will start generating steam. On the other hand, if the water level (water amount) in the water tank 71 is insufficient to perform the selected cooking menu, the control device 80 displays that fact on the operation panel 13 as a warning notification. In this case, steam generation is not started until the lack of water level (water amount) is resolved.

  When steam generation can be started, the water supply pump 57 starts operation and water supply to the steam generator 50 starts. At this time, the drain valve 54 is closed.

  Water accumulates from the bottom of the pot 51. When the pot water level sensor 56 detects that the water level has reached a predetermined level, the water supply is stopped there. Then, energization to the steam generating heater 52 is started. The steam generating heater 52 directly heats the water in the pot 51.

  Simultaneously with the energization of the steam generating heater 52 or when the water in the pot 51 reaches the predetermined temperature, the energization of the blower 25 and the steam heater 41 is also started. The blower 25 sucks the steam in the heating chamber 20 from the suction port 28 and sends the steam to the steam generator 50. Since the centrifugal fan 26 is used to send out the steam, a higher pressure can be generated compared to 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.

  Since the flow velocity of the airflow is high in this way, the cross-sectional area of the flow path can be smaller than the flow rate. Therefore, the pipe forming the main body of the external circulation path 30 can have a circular cross section and a small diameter, and the surface area of the external circulation path 30 can be reduced as compared with the case where the external circulation path 30 is formed by a duct having a rectangular cross section. . For this reason, although hot steam passes through the inside, heat dissipation from the external circulation path 30 is reduced, and the energy efficiency of the steam cooker 1 is improved. 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 97 closes the duct 96 leading from the duct 31 to the duct 93. The steam pumped from the blower 25 enters the steam suction ejector 34 from the duct 31, and further enters the subcavity 40 through the duct 35.

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

  The steam exiting the steam suction ejector 34 flows into the subcavity 40 through the duct 35. The steam that has entered the subcavity 40 is heated to 300 ° C. by the steam heater 41 and becomes superheated steam. A part of the superheated steam is ejected downward from the upper fusible hole 43. Another part of the superheated steam goes to the subcavity 44 through the duct 45 and is ejected laterally from the side air holes 46.

  8 and 9 show the flow of steam in a state where the object to be heated F is not put into the heating chamber 20. From the upper fumarole 43, the steam is spouted downward with a momentum reaching the bottom surface of the heating chamber 20. The steam that has collided with the bottom surface of the heating chamber 20 turns to the outside. And this vapor | steam starts rising after coming out of the airflow which blows down downward. Since steam, especially superheated steam, is light, this direction change occurs naturally. As a result, convection is generated inside the heating chamber 20 as shown by the arrows in the drawing, in which the air is blown down at the center and raised outside.

  In order to form a clear convection, the arrangement of the upper fumaroles 43 is also devised. That is, as shown in FIG. 10, the arrangement of the upper blow holes 43 is dense at the center of the bottom panel 42 and sparse at the peripheral edge. As a result, at the peripheral edge of the bottom panel 42, the steam blowing force is weakened and the rise of the steam is not hindered, so that convection appears more clearly.

  Steam is ejected sideways from the side fumarole 46. This steam meets the central part of the heating chamber 20 and then mixes with the convection generated by the steam from the upper blow hole 43. The convective steam is sequentially sucked into the suction port 28, goes through a route called the subcavity 40 from the external circulation path 30, and then returns to the heating chamber 20. In this way, the steam in the heating chamber 20 repeats circulation such that it exits the external circulation path 30 and returns to the heating chamber 20.

  When the object to be heated F is placed in the heating chamber 20, the superheated steam heated to about 300 ° C. and ejected from the upper blow hole 43 collides with the object to be heated F and transfers heat to the object to be heated F. In this process, the steam temperature is reduced to about 250 ° C. The superheated steam that has come into contact with the surface of the object to be heated F releases latent heat when dew condensation occurs on the surface of the object to be heated F. This also heats the article F to be heated.

  As shown in FIGS. 4 and 5, after heat is applied to the article F, the steam turns outside and flows out of the air stream that blows downward. As described above, since the steam is light, the vapor starts to rise after coming out of the down-flowing air current, and forms a convection as shown by an arrow inside the heating chamber 20. By this convection, while maintaining the temperature in the heating chamber 20, it is possible to keep the heated object F colliding with the superheated steam that has just been heated in the subcavity 40, and heat is rapidly and rapidly applied to the heated object F. Can be given.

  The steam ejected laterally from the side fumaroles 46 enters under the rack 22 from the left and right and meets under the object F to be heated. The steam jet direction from the side blow holes 46 is tangential to the surface of the object to be heated F, but the steam from the left and right meets in this way, so that the steam does not escape straight to the other side. It stays under the object F and overflows. For this reason, the same effect as when the steam is sprayed in the normal direction of the surface of the object to be heated F is generated, and the heat of the steam is reliably transmitted to the lower surface portion of the object to be heated F.

  As described above, the object to be heated F is cooked in the same manner as the upper surface portion up to the portion where the steam from the upper blow hole 43 does not hit by the steam from the side blow hole 46. Thereby, the cooking result with a good appearance without unevenness can be obtained. Moreover, since the to-be-heated material F receives heat equally from the whole surface, it is fully heated to a center part for a short time.

  The vapor from the side fumaroles 46, which was initially about 300 ° C., falls to about 250 ° C. after it hits the object F to be heated, and heat is transferred to the object F in the process. Further, when condensation is formed on the surface of the object to be heated F, latent heat is released to heat the object to be heated F.

  The steam from the side nozzle holes 46 gives heat to the lower surface of the article to be heated F, and then joins the convection generated by the steam from the upper nozzle holes 43. Convective steam is sequentially sucked into the suction port 28. Then, after making a round of the route called the subcavity 40 from the external circulation path 30, the flow returns to the heating chamber. In this way, the steam 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 amount of steam in the heating chamber 20 increases. The surplus vapor is discharged outside the machine through the duct 93. If the steam goes out of the cabinet 10 as it is, dew condensation occurs on the surrounding wall surface and mold occurs. However, since the heat radiating portion 94 is located in the middle of the duct 93, the steam is deprived of heat while passing through the duct 93 and is condensed on the inner surface of the duct 93. Therefore, the amount of steam that goes out of the cabinet 10 is small and does not cause a serious problem. The water condensed on the inner surface of the duct 93 flows in the direction opposite to the direction of the exhaust and is received by the tray 21. This water can be discarded together with the water accumulated in the tray 21 for other reasons after cooking.

  The side fumarole 46 is separated from the subcavity 40, and is disadvantageous than the upper fumarole 43 in terms of vapor ejection. However, since the area sum of the left and right side air holes 46 is made larger than the area sum of the upper air holes 43, a sufficient amount of steam is guided to the side air holes 46, and the upper and lower surfaces of the object F to be heated. The unevenness of heating is reduced.

  Since the object to be heated F is heated while circulating the steam in the heating chamber 20, the energy efficiency of the steam cooker 1 is high. Then, since the superheated steam from above is ejected downward from the plurality of upper air holes 43 distributed over the entire surface of the bottom panel 42 of the subcavity 40, almost the entire heated object F is steam from above. It will be wrapped in. Combined with the collision of the superheated steam with the object to be heated F and the large area of the collision, the heat contained in the superheated steam is quickly and efficiently transmitted to the object to be heated F. Further, the steam that has entered the subcavity 40 is heated by the steam heater 41 and expands, so that the momentum of the jet increases and the collision speed with the heated object F increases. Thereby, the to-be-heated material F is heated more rapidly.

  Since the centrifugal fan 26 can generate a higher pressure than the propeller fan, the jet output from the upper blow hole 43 can be increased. As a result, the superheated steam can be ejected with a momentum reaching the bottom surface of the heating chamber 20, and the heated object F 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.

  In addition, the strong blowing power of the blower 25 greatly helps to quickly exhaust from the exhaust port 32 when the door 11 is opened.

  Since the upper surface of the bottom panel 42 of the subcavity 40 is dark, it absorbs radiant heat emitted from the steam heater 41 well. 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, as described above, the ceiling wall of the heating chamber 20 may also be used as the bottom panel of the subcavity 40.

  When the object to be heated F is meat, the oil may dripping when the temperature rises. If the object to be heated F is a liquid contained in a container, it may boil and partially spill. What has dripped or spilled is received by the tray 21 and waits for processing after cooking is completed.

  If steam is continuously generated by the steam generator 50, the water level in the pot 51 is lowered. When the pot water level sensor 56 detects that the water level has dropped to a predetermined level, the control device 80 restarts the operation of the water supply pump 57. The water supply pump 57 sucks the water in the water tank 71 and replenishes the pot 51 with the evaporated water. When the pot water level sensor 56 detects that the water level in the pot 51 has recovered to a predetermined level, the control device 80 stops the operation of the water supply pump 57 again.

  If the pot water level sensor 56 or the feed water pump 57 fails, or if the water pump 57 does not stop operating due to other reasons, the water level in the pot 51 continues to rise above a predetermined level. When the water level reaches the overflow level, the water sent from the feed pump 57 overflows from the overflow pipe 98 and flows into the duct 93. For this reason, the water in the pot 51 does not enter the external circulation path 30 from the steam suction ejector 34. The water that has entered the duct 93 is received by the tray 21.

  Since the tray 21 has a large area and a large capacity, it can receive a considerable amount of water. However, since the capacity is limited, it is advisable to take safety measures such as issuing an alarm when the operation of the water supply pump 57 continues abnormally for a long time or forcibly stopping the operation of the water supply pump 57.

  After cooking is completed, the control device 80 displays a message to that effect on the operation panel 13 and sounds a signal. A user who knows the end of cooking by sound and display opens the door 11 and takes out the article F to be heated from the heating chamber 20.

  When the door 11 is about to open, the control device 80 switches the open / close state of the damper 97 and opens the duct 96. As a result, the airflow flowing in the external circulation path 30 passes from the duct 96 to the duct 93, and there is almost no part of turning to the steam generator 50. For this reason, the amount of steam flowing into the sub-cavity 40 is reduced, and the steam ejection from the upper air hole 43 and the side air holes 46 is extremely weak, if any. Therefore, the user can safely take out the object to be heated F without being exposed to steam on his face or hand and suffering burns. The damper 97 opens the duct 96 while the door 11 is open.

  Since the steam is not circulated in the duct 96 and the duct 93, the temperature is not as high as that of the external circulation path 30. Therefore, the vapor flowing from the external circulation path 30 is condensed when it comes into contact with the inner walls of the ducts 96 and 93. The water generated by the condensation flows down in the duct 93 and enters the tray 21. This water can be discarded together with the water accumulated in the tray 21 for other reasons after cooking.

  If exhausting is performed by starting the blower 25 that is stopped, a time lag occurs until the steady blower state is reached, but in this embodiment, the blower 25 is already in operation and the time lag is zero. is there. In addition, since the circulating airflow that has passed through the heating chamber 20 and the external circulation path 30 becomes the exhaust flow from the duct 93 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 the time until opening of the door 11 is attained can be shortened.

  The situation that the user is about to open the door 11 can be notified to the control device 80 as follows, for example. That is, a latch that keeps the door 11 closed is provided between the cabinet 10 and the door 11, and a latch lever that unlocks the latch is provided so as to be exposed from the handle 12. A switch that opens and closes in response to the movement of the latch or the latch lever is disposed inside the door 11 or the handle 12, and when the user performs an unlocking operation by grasping the handle 12 and the latch lever, the switch 80 controls the control device 80. To be signaled.

  When there is a long rest time until the next cooking, or when there is no cooking plan in the cold region until the next morning, the drain valve 54 is opened through the operation panel 13 after the cooking is finished, Drain the water. In this way, it is possible to avoid a situation where germs and algae propagate in the water in the pot 51 or the water in the pot 51 freezes.

  Next, the water droplet receiver 16 that is a feature of the present invention will be described.

  As shown in FIG. 11, the water droplet receiver 16 is provided integrally with the drainage tank 14. A partition plate 16a is provided between the water droplet receiving portion 16 and the drainage tank 14, and at least one opening (not shown) is provided in the partition plate 16a. Thereby, the water droplet receiving part 16 and the drainage tank 14 will be connected so that internal water can move bidirectionally.

  As described above, the water drop receiver 16 and the drain tank 14 communicate with each other, so that the amount of water drops attached to the door 11 is relatively large, or the water drops frequently attach to the door 11 every time the steam cooker 1 is used. As a result, even if the amount of water received by the water droplet receiver 16 increases, the water in the water droplet receiver 16 flows toward the drainage tank 14 through the opening provided in the partition plate 16a. . Therefore, it is possible to avoid a situation in which the inside of the water droplet receiver 16 in the steam cooker 1 becomes full of water immediately. As a result, the user does not need to frequently discard the water in the water droplet receiver 16, and the processing burden on the user can be reduced.

  For example, when the water droplet receiver 16 and the drainage tank 14 are configured separately, it is necessary to discard the water separately, and the number of times of discarding unnecessary water inevitably increases. However, if the water drop receiver 16 and the drain tank 14 are integrated as in the present embodiment, the water collected in the water drop receiver 16 and the drainage can be extracted by pulling out the drain tank 14 (or the water drop receiver 16). Both the water accumulated in the tank 14 can be discarded at a time. Therefore, compared with the former case, the number of times of discarding unnecessary water can be greatly reduced, and the processing burden on the user can be surely reduced from this point.

  By the way, when assuming the worst situation where all the water in the water tank 71 is supplied to the pot 51 and all of the water is drained to the drainage tank 14 due to some factor such as equipment failure, the capacity of the drainage tank 14 is reduced to water. If it is smaller than the capacity of the tank 71, the water drained into the drain tank 14 may overflow from the drain tank 14 and flood the surroundings.

  Therefore, it is desirable that the capacity of the drainage tank 14 be larger than the capacity of the water tank 71 in case of such an emergency. Thereby, even if all the water in the water tank 71 is drained to the drainage tank 14 through the pot 51 for some reason, all the water can be stored in the drainage tank 14. As a result, it is possible to avoid the worst situation that water overflows from the drainage tank 14 and the surrounding area is flooded.

  In the present embodiment, when the water drop receiver 16 and the drain tank 14 are communicated with each other, the partition plate 16a having an opening is provided between the water drop receiver 16 and the drain tank 14, but the partition plate 16a is not necessarily provided. It is not necessary and can be unnecessary. That is, even if the partition plate 16a is not provided, the water droplet receiver 16 and the drainage tank 14 communicate with each other, so that the effect of the present embodiment described above can be obtained.

  In the present embodiment, the water drop receiver 16 and the drain tank 14 are provided integrally. However, the water drop receiver 16 and the drain tank 14 are not necessarily integrated. May be. For example, the water droplet receiving unit 16 and the drain tank 14 may be configured separately, and may be configured to be separably connected via a communication unit (for example, a communication pipe).

  At this time, when the two are separated, the internal water leaks from each other's connecting portion. To prevent this, the function equivalent to the coupling plugs 59a and 59b as shown in FIG. It is preferable to have a configuration in which a device having the above is mounted. In other words, in a state where the water droplet receiving portion 16 and the communication portion are connected, water can be passed by coupling the coupling plugs to each other, and in a state where the water droplet receiving portion 16 and the communication portion are separated from each other, each coupling is connected. Since each plug is closed, leakage of water inside can be prevented.

  In the present embodiment, a configuration is adopted in which the steam in the heating chamber 20 is returned from the external circulation path 30 to the heating chamber 20 through the subcavity 40 again. That is, the suction port 28 and the steam generating means are connected, and a circulation system (external circulation path 30) for circulating the steam between the inside and the outside of the heating chamber 20 is provided. In this configuration, the steam can be effectively used, and high-temperature steam suitable for heating the article to be heated F can be obtained immediately and the article to be heated F can be heated. However, it is possible to adopt a different configuration. For example, a configuration may be adopted in which new steam is constantly supplied to the subcavity 40 and the steam overflowing from the heating chamber 20 is continuously discharged from the steam discharge pipe 47.

  In addition, although this embodiment demonstrated the steam cooker 1 from which the door 11 opens upwards with respect to the opening part of the front of the heating chamber 20, this invention is not necessarily limited to this structure. For example, the configuration of the present invention can be applied to the steam cooker 1 having a configuration in which the rectangular door 11 is opened to the right with the left vertical axis as a rotation axis.

  In addition, various modifications can be made without departing from the spirit of the invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for all cookers that perform cooking with superheated steam, whether for home use or business use.

It is an external appearance perspective view of the steam cooker which is an example of the heating cooker which concerns on one Embodiment of this invention. It is an external appearance perspective view of the steam cooker of the state which opened the door of the heating chamber. It is a front view of the steam cooker of the state which removed the door of the heating chamber. It is explanatory drawing which shows the basic structure inside a steam cooker. It is explanatory drawing which shows the basic structure inside the steam cooker seen from the direction orthogonal to FIG. It is a top view of a heating chamber. It is a block diagram of the control apparatus of a steam cooker. It is explanatory drawing which shows the flow of the vapor | steam inside a steam cooker in the state which has not put the to-be-heated object in the heating chamber. It is explanatory drawing which shows the flow of the vapor | steam in a steam cooker at the time of seeing from a right angle direction with FIG. It is a top view of the bottom panel of a subcavity. It is sectional drawing which shows typically the outline structure of the drain tank vicinity of a steam cooker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steam cooker 11 Door 14 Drain tank 16 Water drop receiving part 20 Heating chamber 50 Steam generator (steam generation means)
51 pots (steam generation means)
71 Water tank (Water supply tank)
F Object to be heated

Claims (2)

Steam generating means for generating steam with water supplied from a water supply tank and supplying the steam to a heating chamber for heating an object to be heated;
A drainage tank for storing water drained from the steam generating means;
A water droplet receiving portion that is provided integrally with the drainage tank, and that receives water droplets attached to the door of the heating chamber by condensation of steam supplied to the heating chamber ;
A partition plate provided between the water drop receiver and the drainage tank and having an opening;
A steam cooker characterized in that the water drop receiver and the drainage tank communicate with each other through the opening . The steam cooker according to claim 1 , wherein a capacity of the drainage tank is larger than a capacity of the water supply tank .

Images