JP2007032961A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably and accurately close a steam supply passage from a steam generator to a heating chamber. <P>SOLUTION: Cams 117A-117C for driving a damper for opening/closing a blow-in port of an inner nozzle are shifted in phase every predetermined angle (3°) and mounted to a camshaft 116. The cams 117A-117C can thereby abut sequentially on a cam follower of the damper in the open position and lower the required rotational torque of the camshaft 116 when starting to close the damper. The damper can thus be closed stably and accurately. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cooking device that cooks food using steam.

  2. Description of the Related Art Conventionally, as a steam cooker that performs cooking of an object to be heated such as food using steam, there is one that feeds superheated steam into an oven cabinet (see, for example, Patent Document 1 (Japanese Patent Laid-Open No. Hei 8-49854)). . This steam cooker is provided by a steam generator that generates steam by providing a steam generating heater in the pot, and a steam superheater that is provided on the steam generator along a vertical plane, and is generated by the steam generator. A steam superheater that generates superheated steam by heating the steam that has been heated, and the superheated steam generated by the steam superheater is fed into the oven chamber by a steam reflux fan to cook food. Yes.

  However, the steam cooker described in Patent Document 1 has the following problems. That is, as described above, the superheated steam generated by the steam superheater is sent into the oven by the steam recirculation fan. However, the steam superheater and the oven are merely communicated with each other through an opening provided in the oven, and the opening is always open. Therefore, for example, when the superheated steam remaining in the oven chamber is exhausted after the cooking of the object to be heated using the superheated steam is completed, the superheated steam remaining from the steam superheater leaks. Therefore, there is a problem that the superheated steam in the oven can not be quickly exhausted.

Further, when the object to be heated is cooked with a heat source different from the superheated steam from the steam superheater, the opening remains open, so that the air in the oven chamber heated by the heat source is opened to the opening. There is also a problem that the object to be heated cannot be efficiently heated.
JP-A-8-49854 (FIG. 8)

  Then, the subject of this invention is providing the heating cooker which can close the supply path | route of the steam from a steam generator to a heating chamber stably and correctly.

In order to solve the above problems, the heating cooker of the present invention is:
A steam generator for generating steam;
A heating chamber for heating an object to be heated by steam supplied from the steam generator;
A steam suction ejector that sucks the steam generated by the steam generator from the suction port, and blows out the gas from the plurality of blowing ports to the heating chamber from a plurality of outlets;
A plurality of first dampers provided on one rotating shaft and opening and closing the plurality of blowing ports in the steam suction ejector;
A plurality of first cams fixed to one rotating shaft and closing the plurality of first dampers;
When the plurality of first cams rotate in a direction to close the plurality of first dampers, the plurality of first cams sequentially contact the plurality of cam followers provided in the plurality of first dampers with a predetermined phase difference. It is characterized by being placed in contact.

  According to the above configuration, the plurality of blowing ports in the vapor suction ejector are closed by the plurality of first dampers. At this time, the plurality of first cams sequentially come into contact with the plurality of cam followers provided in the plurality of first dampers with a predetermined phase difference. Therefore, as compared with the case where the plurality of first cams are simultaneously brought into contact with the plurality of cam followers, the rotation shaft of the first cam is rotated at the time of starting to close the first damper. The torque required for this can be reduced. As a result, the first dampers can be stably and accurately closed, and the steam supply passage from the steam generator to the heating chamber can be stably and accurately closed.

Moreover, in the heating cooker of one embodiment,
An exhaust passage for discharging steam in the heating chamber to the outside;
The rotating shaft provided with the plurality of first dampers is fixed to the rotating shaft to which the second damper for opening and closing the exhaust passage and the plurality of first cams are fixed, and And a second cam for closing the second damper.

  According to this embodiment, it is possible to close the steam supply passage from the steam generator to the heating chamber in association with opening and closing of the exhaust passage. Further, by controlling the rotation of one rotating shaft to which the plurality of first cams and the second cam are fixed, the plurality of first dampers provided on the same rotating shaft and the first cam 2 can be opened and closed, and the opening and closing operation of the steam supply passage from the steam generator to the heating chamber and the opening and closing operation of the exhaust passage can be easily controlled.

Moreover, in the heating cooker of one embodiment,
The plurality of first cams and the second cam are:
When the second damper is opened, all the first dampers are already opened,
The closing start of the second damper is arranged so as to have a phase difference from the closing start of all the first dampers.

  According to this embodiment, when the second damper is opened, all the first dampers are also opened, so that the steam in the steam supply passage from the steam suction ejector to the heating chamber is also reduced. It is discharged outside together with the steam in the heating chamber. Therefore, dew condensation in the steam supply passage can be prevented. Furthermore, since the closing start of the second damper is performed with a phase difference from the closing start of all the first dampers, the second cam and the plurality of first cams are: The cam follower provided in the second damper and the plurality of cam followers provided in the plurality of first dampers do not contact at the same time. Accordingly, it is possible to reduce the torque required to rotate the rotary shafts of the first and second cams at the time of starting to close the second damper.

Moreover, in the heating cooker of one embodiment,
The plurality of first cams and the second cam are:
When the second damper is opened, all the first dampers are already closed,
The closing start of the second damper is arranged so as to have a phase difference from the closing start of all the first dampers.

  According to this embodiment, when the second damper is opened, all the first dampers are closed, so that the steam remaining from the steam generator leaks into the heating chamber. The steam in the heating chamber can be exhausted quickly and reliably. Furthermore, since the closing start of the second damper is performed with a phase difference from the closing start of all the first dampers, the second cam and the plurality of first cams are: The cam follower provided in the second damper and the plurality of cam followers provided in the plurality of first dampers do not contact at the same time. Accordingly, it is possible to reduce the torque required to rotate the rotary shafts of the first and second cams at the time of starting to close the second damper.

Moreover, in the heating cooker of one embodiment,
The plurality of blowing ports in the vapor suction ejector are formed in a vertical direction,
The opening angle of the first damper when the first damper is opened is an initial contact point that is a position where the first cam first contacts the cam follower when the first damper is closed. The angle formed by the plane passing through the axis of the rotation axis of the first damper and the plane passing through the axis of the rotation axis of the first cam and the initial contact point is the opening of the first damper. It is set to be larger than the above angle when the angle is 90 degrees.

  A first plane that passes through the initial contact point and the axis of the first damper's rotation axis, and a second plane that passes through the axis of the first cam's rotation axis and the initial contact point. As the angle formed approaches 180 degrees, the rotational force that the first cam applies to the cam follower increases. According to this embodiment, the opening angle of the first damper is such that the angle formed by the first and second planes is greater than the angle when the opening angle of the first damper is 90 degrees. Is also set to be large. Therefore, the rotational force that the first cam applies to the cam follower can be made larger than when the opening angle of the first damper is 90 degrees. As a result, it is possible to increase the torque of the rotating shaft at the time of starting to close the first damper, and to close the inner nozzle more quickly and accurately.

  As is clear from the above, when the plurality of first cams close the plurality of first dampers that open and close the blowing ports of the plurality of steam suction ejectors, the heating cooker according to the present invention has the plurality of first cams. Since one cam sequentially contacts a plurality of cam followers provided in the plurality of first dampers with a predetermined phase difference, the plurality of first cams simultaneously contact the plurality of cam followers. As compared with the case where the first damper is made, the torque required to rotate the rotating shaft of the first cam at the time of starting to close the first damper can be reduced. Accordingly, the first dampers can be stably and accurately closed.

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

  FIG. 1 is an external perspective view of the heating cooker according to the present embodiment. The heating cooker 1 is provided with an operation panel 11 at the upper part of the front surface of the rectangular parallelepiped cabinet 10, and a door 12 that rotates around the lower end side is provided below the operation panel 11 on the front surface of the cabinet 10. It is provided and roughly configured. A handle 13 is provided at the top of the door 12, and a heat-resistant glass window 14 is fitted into the door 12.

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

  Further, a stainless steel tray 21 is installed on the bottom surface of the heating chamber 20, and a stainless steel wire rack 24 (see FIG. 3) for placing an object to be heated is installed on the tray 21. The Furthermore, a substantially rectangular side surface steam outlet 22 (only one of which is visible in FIG. 2) is provided at the lower part of both side surfaces of the heating chamber 20.

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

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

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

  The third water supply pipe 33 has an L shape that is bent substantially horizontally from a vertically disposed portion, and an auxiliary tank 39 is connected to the other end of the third water supply pipe 33. Furthermore, one end of the fourth water supply pipe 34 is connected to the lower end of the auxiliary tank 39, and the lower end of the steam generator 40 is connected to the other end of the fourth water supply pipe 34. Further, one end of the drain valve 70 is connected to a lower side than the connection point of the fourth water supply pipe 34 in the steam generator 40. One end of a drain pipe 71 is connected to the other end of the drain valve 70, and a drain tank 72 is connected to the other end of the drain pipe 71. Note that the upper portion of the auxiliary tank 39 is communicated with the atmosphere via the air release pipe 37 and the exhaust duct 65.

  When the water tank 30 is connected to the receiving port 31 a of the first water supply pipe 31, the water in the water tank 30 rises into the air release pipe 37 until the water level becomes the same as that of the water tank 30. At this time, the water level sensor pipe 38 connected to the water tank water level sensor 36 is sealed at the tip, so that the water level does not rise. However, according to the water level of the water tank 30, the water level sensor pipe 38 has a sealed space. The pressure rises from atmospheric pressure. By detecting this pressure change with a pressure detection element (not shown) in the water level sensor 36 for water tank, the water level in the water tank 30 is detected. In the water level measurement when the pump 35 is stationary, the air release pipe 37 is not necessary, but the suction pressure of the pump 35 directly acts on the pressure detection element, and the accuracy of the water level detection of the water tank 30 decreases. In order to prevent this, an air release pipe 37 having an open end is provided.

  The steam generator 40 includes a pot 41 having the other end of the fourth water supply pipe 34 connected to the lower side, a steam generating heater 42 disposed near the bottom surface of the pot 41, and steam generation in the pot 41. A water level sensor 43 disposed in the vicinity of the upper side of the heater 42 and a steam suction ejector 44 attached to the upper side of the pot 41 are provided. A fan casing 26 is disposed outside the suction port 25 provided in the upper side of the heating chamber 20. Then, the steam in the heating chamber 20 is sucked from the suction port 25 by the blower fan 28 installed in the fan casing 26, and the steam suction ejector of the steam generating device 40 through the first pipe 61 and the second pipe 62. 44 is sent to the inlet side. The first pipe 61 is disposed substantially horizontally and has one end connected to the fan casing 26. The second pipe 62 is arranged substantially vertically, and one end is connected to the other end of the first pipe 61 and the other end is connected to the inlet side of the inner nozzle 45 of the vapor suction ejector 44. .

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

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

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

  Further, the steam temperature raising device 50 is provided at one end of a steam supply passage 23 (only one is visible in FIG. 3) as the superheated steam supply passage that extends toward the left and right sides at the top of the heating chamber 20. Are connected to each other. The steam supply passage 23 extends downward along both side surfaces of the heating chamber 20, and is connected to a side surface steam outlet 22 provided on the lower side of both side surfaces of the heating chamber 20 at the other end. Has been.

  Next, the control system of the heating cooker 1 will be described.

  The control device 80 includes a microcomputer, an input / output circuit, and the like. As shown in FIG. 4, the blower fan 28, the steam heater 52, the damper 68, the drain valve 70, the steam generating heater 42, and the operation Panel 11, water tank water level sensor 36, water level sensor 43, temperature sensor 81 for detecting the temperature in heating chamber 20 (shown in FIG. 3), and humidity sensor 82 for detecting the humidity in heating chamber 20 The pump 35 is connected. Based on detection signals from the water tank water level sensor 36, the water level sensor 43, the temperature sensor 81, and the humidity sensor 82, the blower fan 28, the steam heating heater 52, the damper 68, the drain valve 70, the steam generating heater 42, the operation The panel 11 and the pump 35 are controlled according to a predetermined program.

  Hereinafter, the basic operation of the heating cooker 1 having the above configuration will be described with reference to FIGS. 3 and 4. When a power switch (not shown) of the operation panel 11 is pressed, the power is turned on, and the cooking operation is started by operating the operation panel 11. Then, first, the control device 80 closes the drain valve 70 and starts the operation of the pump 35 with the exhaust passage 67 closed by the damper 68. Then, water is supplied from the water tank 30 into the pot 41 of the steam generator 40 via the first to fourth water supply pipes 31 to 34 by the pump 35. Thereafter, when the water level sensor 43 detects that the water level in the pot 41 has reached a predetermined water level, the pump 35 is stopped to stop water supply.

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

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

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

  And the steam which flowed into the said steam temperature rising apparatus 50 is heated by the steam heater 52, and becomes a superheated steam of about 300 degreeC (it changes with cooking contents). A part of this superheated steam is ejected downward from the plurality of ceiling steam outlets 55 provided in the lower ceiling panel 54 in the heating chamber 20. Further, the other part of the superheated steam is ejected from the side surface steam outlets 22 on both side surfaces of the heating chamber 20 through the steam supply passages 23 provided on the left and right sides of the steam temperature raising device 50.

  Thus, the superheated steam ejected from the ceiling side of the heating chamber 20 is vigorously supplied toward the heated object 90 side in the center, and the superheated steam ejected from the left and right side surfaces of the heating chamber 20 is supplied to the tray 21. After the collision, the material to be heated 90 is supplied while being wrapped from below the material 90 to be heated. As a result, in the heating chamber 20, convection occurs in such a manner that it blows down at the center and rises outside thereof. Then, the convection steam is sequentially sucked into the suction port 25 and repeatedly circulates through the external circulation path 60 and returns to the heating chamber 20 again.

  In this way, by forming a convection of superheated steam in the heating chamber 20, the superheated steam from the steam heating device 50 is blown to the ceiling steam while the temperature and humidity distribution in the heating chamber 20 is kept uniform. It is possible to eject the gas from the outlet 55 and the side outlet 22 and to efficiently collide with the heated object 90 placed on the rack 24, and the heated object 90 is heated by the collision of the superheated steam. In that case, the superheated steam that has contacted the surface of the object to be heated 90 also heats the object to be heated 90 by releasing latent heat when the surface of the object to be heated 90 is condensed. As a result, a large amount of heat of the superheated steam can be reliably and promptly applied to the entire surface of the article 90 to be heated. Therefore, it is possible to realize cooking with no spots and good finish.

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

  After cooking, the control device 80 displays a cooking end message on the operation panel 11, and a buzzer (not shown) provided on the operation panel 11 sounds a signal. When a user who knows the end of cooking by these messages and buzzer opens the door 12, the control device 80 detects that the door 12 has been opened by a sensor (not shown) and opens the damper 68 of the exhaust passage 67. Open instantly. Then, the first pipe 61 of the external circulation path 60 communicates with the exhaust duct 65 via the exhaust passage 67, and the steam in the heating chamber 20 is blown by the blower fan 28 through the suction port 25, the first pipe 61, and the exhaust passage 67. And is discharged from the exhaust port 66 through the exhaust duct 65. This damper operation functions similarly even if the user opens the door 12 during cooking.

  Incidentally, as described above, in the present heating cooker 1, during exhaust, the damper 68 of the exhaust passage 67 is instantaneously opened, and the steam in the heating chamber 20 is removed by the blower fan 28 to the first pipe 61, the exhaust passage 67, and The air is discharged through the exhaust duct 65. However, the first pipe 61 communicates with the second pipe 62, and the second pipe 62 forms the external circulation path 60. Therefore, a part of the steam to be exhausted is diverted to the steam suction ejector 44, circulates through the external circulation path 60, and returns to the heating chamber 20 again, and when the user opens the door 12. Steam may remain in the heating chamber 20.

  Therefore, in the present embodiment, the following ingenuity is applied to the steam suction ejector 44 and the damper 68 of the exhaust passage 67 so that the steam in the heating chamber 20 can be exhausted to the outside more quickly. Hereinafter, the steam suction ejector 44 and the damper 68 of the exhaust passage 67, which are the features of this embodiment, will be described in more detail with reference to FIG.

  FIG. 5 is a schematic cross-sectional view of a portion of the third pipe 63 that connects the steam suction ejector 44 and the dish-shaped case 51 of the steam temperature raising device 50. Third pipes 63A to 63C (in FIG. 5, only the third pipe 63A) are provided on the discharge side of the three outer nozzles 46A to 46C (in FIG. 5, only the outer nozzle 46A appears) constituting the vapor suction ejector 44. Is connected to the other end of each of the third pipes 63A to 63C, and three steam supply pipes 94A, 94B, 94C (in FIG. 5) provided on the side wall of the dish-shaped case 51. Only the steam supply pipe 94A appears). The side of the side wall where the steam supply pipes 94A, 94B, 94C are provided is the back side of the main heating cooker 1, and the steam suction ejector 44 connected to the steam supply pipes 94A, 94B, 94C is the main cooking. It is provided on the back side of the heating chamber 20 in the vessel 1.

  The discharge sides of the inner nozzles 45A to 45C are inserted on the inlet sides of the outer nozzles 46A to 46C, and the dampers 113A to 113C (in FIG. 5) open and close the blow ports at the blow ports of the inner nozzles 45A to 45C. Only the damper 113A appears). Each of the dampers 113A to 113C is provided with cam followers 114A to 114C (only the cam follower 114A appears in FIG. 5) at a predetermined angle with respect to the surfaces of the dampers 113A to 113C. It is rotatably supported by one shaft 115 arranged orthogonally.

  One cam shaft 116 arranged in parallel with the shaft 115 has three cams 117A to 117C (in FIG. 5, cams corresponding to the dampers 113A to 113C) for opening and closing the dampers 113A to 113C. Only 117A appears) is attached in parallel. Moreover, each damper 113A-113C is urged | biased by the direction which opens the blowing inlet of inner nozzle 45A-45C with the spring (not shown). When the cams 117A to 117C rotate in the direction of the arrow D together with the cam shaft 116, the cam peaks of the cams 117A to 117C come into contact with the cam followers 114A ′ to 114C ′ of the dampers 113A ′ to 113C ′ in the open position. The dampers 113A to 113C are rotated in the direction of arrow E to close the blowing ports of the inner nozzles 45A to 45C.

  Also, a shaft 119 arranged in parallel with the cam shaft 116 supports a damper 68 that opens and closes the exhaust passage 67 and a cam follower 118 provided at a predetermined angle with respect to the surface of the damper 68 so as to be rotatable. Yes. Note that the exhaust passage 67 does not appear in FIG. Further, the damper 68 is biased in a direction to open the exhaust passage 67 by a spring (not shown). When the cam 117A rotates in the direction of arrow D and the cam crest of the cam 117A comes into contact with the cam follower 118 ′ of the damper 68 ′ in the open position, the damper 68 rotates in the direction of arrow F to rotate the exhaust passage. 67 is closed.

  In the present embodiment, the dampers 113 </ b> A to 113 </ b> C are biased in a direction to open the blowing ports of the inner nozzles 45 </ b> A to 45 </ b> C, and the damper 68 is biased in a direction to open the exhaust passage 67. And each damper 113A-113C needs to be simultaneously open | released at the time of the cooking mode in which the damper 68 is closed, while being closed simultaneously at the time of the exhaust mode in which the damper 68 is open | released. Therefore, the cam peaks of the cams 117A to 117C are all the same, and as shown in FIG. 5, when the cams follow the cam follower 118 of the damper 68, the cam followers 114A to 114C of the dampers 113A to 113C. Is set so as not to contact. The cam that contacts the cam follower 118 of the damper 68 may be any one of the cams 117 </ b> A to 117 </ b> C. In FIG. 5, the cam 117 </ b> A contacts the cam follower 118.

  Incidentally, as described above, in the configuration of FIG. 5, the three dampers 113A to 113C are opened and closed simultaneously in the exhaust mode. In that case, if the three cams 117A to 117C are in contact with the corresponding cam followers 114A to 114C at the same time, a high rotational torque is required for the cam shaft 116 at the time of starting to close the dampers 113A to 113C. For this reason, the closing operation of the dampers 113A to 113C becomes unstable, and there is a case where the inner nozzles 45A to 45C can be quickly and accurately closed, and further, quick and reliable exhaust cannot be performed. In the present embodiment, the three dampers 113A to 113C do not need to be closed at the same time, and there is no problem even if the three dampers 113A to 113C are closed at a slightly different timing. That is, the damper 68 only needs to open the exhaust passage 67 when all the three dampers 113A to 113C are closed.

  FIG. 6 is a front view (FIG. 6 (a)), a side view (FIG. 6 (b)), and a rear view (FIG. 6 (c)) showing an example of a damper 113 that opens and closes the blowing ports of the inner nozzles 45A to 45C. ). The damper 113 is commonly used as the dampers 113A to 113C. In FIG. 6, reference numeral 121 denotes a damper main body that has a disk shape and covers the blowing port of the inner nozzle 45. On both sides of the rear surface of the damper main body 121, bearing members 122 and 123 are provided that extend downward in the figure and have shaft holes 124 through which the shafts 115 are inserted at the tip portions. Further, a cam follower 114 having a predetermined length is provided extending downward from the lower portion of the damper main body 121. A hook 125 is provided at the center of the back surface of the damper main body 121, and one end of a spring 126 that urges the damper main body 121 in a direction to open the blowing port of the inner nozzle 45 is attached to the hook 125.

  In FIG. 6B, a coil spring is simply illustrated as the spring 126. However, in practice, a spring is wound around the shaft 115 between the cam follower 114 and the bearing members 122 and 123, and one end of this spring is illustrated. A so-called kick spring is used to hook the damper body 121 in the opening direction by hooking the hook 125 from the inside. However, the spring 126 may be of any type as long as it urges the damper main body 121 in the opening direction via the hook 125, and FIG. 6B does not limit the type of the spring 126.

  7 is a front view showing an example of the cam shaft 116 and the cams 117A to 117C (FIG. 7 (a)), and a sectional view taken along the line GG ′ in FIG. 7 (a) (a sectional view of the cam 117A). (FIG. 7 (b)), HH 'arrow cross-sectional view in FIG. 7 (a) (cross-sectional view of cam 117B) (FIG. 7 (c)), and II ′ arrow in FIG. 7 (a) FIG. 7 is a sectional view (a sectional view of the cam 117C) (FIG. 7 (d)). However, FIG. 7 corresponds to the case where the damper 68 is driven by a cam different from the cams 117A to 117C. As can be seen from FIG. 7, the cams 117A to 117C all have the same shape having a width of 60 degrees in the rotational direction, and the cam 117B is arranged with a phase delay of 3 degrees with respect to the cam 117C. 117A is arranged with a phase delay of 3 degrees with respect to cam 117B.

  Therefore, when the cam shaft 116 rotates in the direction of the arrow D and the cam 117C contacts the cam follower 114C, and the cam shaft 116 further rotates three degrees, the cam 117B contacts the cam follower 114B, and the cam shaft 116 further rotates 3 times. The cam 117A comes into contact with the cam follower 114A. Thus, the damper 113C, the damper 113B, and the damper 113A close the blowing ports of the inner nozzles 45A to 45C in this order. When the cam 117A comes into contact with the cam follower 114A, that is, when all the dampers 113A to 113C close the blowing ports of the inner nozzles 45A to 45C, the damper 68 opens the exhaust passage 67. After that, the rotation motor of the cam shaft 116 is stopped.

  In this case, the area of the opening of the exhaust passage 67 that is opened and closed by the damper 68 is larger than the area of the inlet of the inner nozzles 45A to 45C that are opened and closed by the dampers 113A to 113C. By doing so, the internal pressure of the exhaust passage 67 having a larger area than the blowing ports of the inner nozzles 45A to 45C having a smaller area becomes lower, so that the steam from the heating chamber 20 that has passed through the first pipe 61 is exhausted. It becomes easy to flow into the passage 67. Therefore, a large exhaust capacity can be obtained while maintaining the performance of the blower fan 28.

  In the case of the arrangement of the cams 117A to 117C shown in FIG. 7, since the cams 117 having the same shape are arranged with the phases being sequentially shifted, the inner nozzles 45A to 45C are sequentially opened by the dampers 113A to 113C. It will be. However, there is no particular problem even if the cams 117A to 117C are detached from the cam followers 114A to 114C at the same time, and the widths of the cams 117A to 117C in this case are different.

  By the way, as described above, when the cams 117A to 117C are brought into contact with the cam followers 114A ′ to 114C ′ of the dampers 113A ′ to 113C ′ at the open positions to rotate the dampers 113A to 113C, the cams 117A to 117C are rotated. Depending on the contact position between 117C and the cam followers 114A ′ to 114C ′, the rotational torque of the shaft 115 at the time of starting to close the dampers 113A to 113C becomes small.

  FIG. 9 shows a contact state between the cam 117 and the cam follower 114 when the opening position of the damper 113 is a position where the damper main body 121 is horizontal (that is, a position where the opening angle of the damper 113 is 90 degrees). . In this case, as shown in FIG. 10, the line segment connecting the axis 131 of the shaft 115 of the damper 113 and the initial contact point 132 where the cam 117 first contacts the cam follower 114 is defined as “a”, and the cam shaft A line segment connecting the axis 133 of 116 and the initial contact point 132 is defined as “b”. Then, the angle θ formed by the line segment a and the line segment b is about 125 degrees. In this case, the rotational force fc applied to the cam follower 114 by the force f of the cam 117 acting on the cam follower 114 at the initial contact point 132 decreases as the angle θ approaches 90 degrees, and becomes “0” when the angle θ reaches 90 degrees. Become.

  Therefore, in the present embodiment, in order to increase the rotational force fc applied to the cam follower 114 by the force f of the cam 117, the cam follower 114 contacts when the damper 113 is opened as shown in FIG. Ribs 134 are provided, and the opening angle of the damper 113 is set to 60 degrees. By doing so, the angle θ becomes larger than when the opening angle of the damper 113 is 90 degrees, and the rotational force fc that the cam 117 gives to the cam follower 114 can be increased. Therefore, the rotational torque of the shaft 115 at the time of starting to close the damper 113 can be increased to close the inner nozzle 45 more stably and accurately.

  The opening angle of the damper 113 is not limited to 60 degrees, but is determined by the positional relationship between the shaft 115 of the damper 113, the cam shaft 116, and the initial contact point 132. That is, the rotational force fc applied to the cam follower 114 by the force f of the cam 117 increases as the angle θ approaches 180 degrees, and reaches the “maximum value f” when the angle θ reaches 180 degrees. When the cam 117 having the shape as shown in FIG. 7 and the cam follower 114 having the shape as shown in FIG. 6 are arranged as shown in FIGS. As can be seen from FIG. 8, when the opening angle of the damper 113 is 60 degrees, the angle θ is approximately 180 degrees. Therefore, in this embodiment, the opening angle of the damper 113 is set to 60 degrees.

  Therefore, when the shape of the cam 117 or the cam follower 114 is another shape, or when the positional relationship between the shaft 115 of the damper 113, the cam shaft 116, and the initial contact point 132 is another positional relationship, the angle θ is In order to make it approximately 180 degrees, it is necessary to set the opening angle of the damper 113 to an angle different from 60 degrees.

In short, the angle θ formed by the plane passing through the axis 131 of the shaft 115 of the damper 113 and the initial contact point 132 and the plane passing through the axis 133 of the cam shaft 116 and the initial contact point 132 is the opening of the damper 113. The opening angle of the damper 113 may be set so as to be larger than the angle θ (= θ ₀ ) when the angle is 90 degrees. Furthermore, if the opening angle of the damper 113 is set so that the angle θ becomes the maximum angle θmax within a range in which the steam from the heating chamber 20 sucked from the suction port 25 can be supplied to the blowing port of the inner nozzle 45 without hindrance. More preferable.

  As described above, in the present embodiment, the inlets of the three inner nozzles 45 </ b> A to 45 </ b> C in the steam suction ejector 44 that supplies the steam generated by the steam generator 40 to the steam temperature raising device 50 are provided as dampers 113 </ b> A to 113 </ b> A. It can be closed by 113C. Therefore, the steam remaining from the steam generator 40 leaks into the heating chamber 20 when the superheated steam remaining in the heating chamber 20 is exhausted after the cooking of the article 90 to be heated using the superheated steam is completed. It is possible to prevent the superheated steam in the heating chamber 20 from returning to the heating chamber 20 via the vapor suction ejector 44. That is, the superheated steam in the heating chamber 20 can be quickly exhausted.

  At that time, cams 117A to 117C for driving dampers 113A to 113C that open and close the blowing ports of the inner nozzles 45A to 45C are attached to the cam shaft 116 while shifting the phase by a predetermined angle “3 degrees”. Therefore, the cams 117A to 117C can sequentially contact the cam followers 114A ′ to 114C ′ of the dampers 113A ′ to 113C ′ in the open position, and the necessary rotation of the cam shaft 116 at the time of starting to close the dampers 113a to 113c. Torque can be reduced. As a result, the dampers 113 </ b> A to 113 </ b> C can be stably closed, and quick and reliable exhaust can be performed.

Further, the angle θ formed by the plane passing through the axis 131 of the shaft 115 of the damper 113 and the initial contact point 132 and the plane passing through the axis 133 of the cam shaft 116 and the initial contact point 132 is the opening angle of the damper 113. The opening angle of the damper 113 is set so as to be larger than the angle θ (= θ ₀ ) when the angle is 90 degrees. Therefore, the rotational force fc applied to the cam follower 114 by the force f of the cam 117 acting on the cam follower 114 at the initial contact point 132 can be made larger than when the opening angle of the damper 113 is 90 degrees. As a result, the rotational torque of the shaft 115 at the time of starting to close the damper 113 can be increased, and the inner nozzle 45 can be closed more quickly and accurately.

  By the way, in the said embodiment, "exhaust mode" is mentioned as an example which closes the said inner nozzles 45A-45C with damper 113A-113C. However, when closing the blowing port of the inner nozzle 45, it is not always the case of the “exhaust mode”. For example, one of the three outer nozzles 46 </ b> A to 46 </ b> C is directly communicated with the heating chamber 20 without using the steam temperature raising device 50, and the steam generator 40 supplied from the center outer nozzle 46 </ b> B. There is a heating cooker capable of steaming and warming the object 90 to be heated by non-superheated steam from.

  According to this cooking device, in the “steaming / warming mode”, the blowing port of the inner nozzle 45B communicating with the central outer nozzle 46B is opened. On the other hand, in order to prevent the steam warming device 50 from being wastefully supplied and steaming and warming efficiency is reduced, the inner nozzle 45A communicating with the outer nozzles 46A, 46C on both sides connected to the steam warming device 50 is used. , 45C inlet is closed. In this case, the cams 117A and 117C for driving the dampers 113A and 113C that open and close the blowing ports of the inner nozzles 45A and 45C are attached to the cam shaft 116 by shifting the phase by a predetermined angle, thereby allowing the dampers 113C and 113A. The required rotational torque of the cam shaft 116 at the time of starting to close can be reduced. Therefore, the dampers 113A and 113C can be closed stably and accurately.

  In the above embodiment, the phase is delayed by 3 degrees in the order of the cam 117C → cam 117B → cam 117A. However, the order and degree of delaying the phase are not limited to the order or 3 degrees. Further, the number of dampers closed at the same time is not limited to three.

  In the above embodiment, for convenience of explanation, the case where the damper 68 is driven by a cam different from the cams 117A to 117C has been described as an example. However, when the damper 68 is driven by any one of the cams 117A to 117C. Needless to say, the present invention can be applied.

  Further, in the configuration shown in FIG. 5, a damper 68 that opens and closes the exhaust passage 67 is attached to a shaft 119 different from the shaft 115 of the dampers 113A to 113C that opens and closes the inner nozzles 45A to 45C, and drives the damper 113A. It is made to drive at 117A. However, as shown in FIG. 11, the exhaust port 67 ′ of the exhaust passage 67 is arranged in the same arrangement as the blowing ports 45 ′ A to 45 ′ C of the inner nozzles 45 </ b> A to 45 </ b> C, and the damper 68 is disposed on the shafts of the dampers 113 </ b> A to 113 </ b> C. 115 is attached. And as shown in FIG. 12, it is also possible to drive the damper 68 with the cam 127 attached to the cam shaft 116 same as cam 117A-117C for damper 113A-113C. In this case, it is assumed that the basic configuration of the damper 68 is the same as that in FIG.

  However, FIG. 11A is a longitudinal sectional view of the steam suction ejector 44 and the steam generator 40 including the central axis of the inner nozzle 45C, and FIG. 11B is a longitudinal sectional view including the central axis of the inner nozzle 45B. 11 (c) is a longitudinal sectional view including the central axis of the inner nozzle 45A, and FIG. 11 (d) is a longitudinal sectional view including the central axis of the exhaust port 67 ′. 12A is a front view showing an example of the cam shaft 116 and each of the cams 117A to 117C, 127, and FIG. 12B is a cross-sectional view taken along the line JJ ′ in FIG. 12 (c) is a cross-sectional view taken along the line KK ′ in FIG. 12 (a) (cross-sectional view of the cam 117A), and FIG. 12 (d) is a cross-sectional view of FIG. 12 (a). FIG. 12 is a cross-sectional view taken along the line LL ′ (a cross-sectional view of the cam 117B), and is a cross-sectional view taken along the line MM ′ (a cross-sectional view of the cam 117C) in FIG.

  As can be seen from FIG. 12, the cams 117 </ b> A to 117 </ b> C are attached to the cam shaft 116 as in the case of FIG. 7. Therefore, when the cam shaft 116 rotates in the direction of the arrow N, the cams 117C to 117A sequentially come into contact with the cam followers 114C to 114A, and the dampers 113C to 113A sequentially turn into the blow ports 45′A to 45 of the inner nozzles 45A to 45C. 'C is closed. Therefore, the required rotational torque of the cam shaft 116 at the time of starting to close the dampers 113C to 113A can be reduced. In that case, the exhaust passage 67 is already open by the damper 68.

  Further, the cams 117C to 117A and the cam 127 are arranged so that the damper 68 starts to be closed with a phase difference from the damper 113C to the damper 113A. For this reason, the cam 127 and the cams 117C to 117A do not simultaneously contact the cam follower provided in the damper 68 and the cam followers 114C to 114A of the dampers 113C to 113A. Therefore, compared with the case where the cam 127 and each of the cams 117C to 117A are in contact with the respective cam followers at the same time, the torque required to rotate the cam shaft 116 at the time of starting to close the damper 68 can be reduced. is there.

  In the above-described embodiment, when the damper 68 opens the exhaust passage 67 during the “exhaust mode”, the dampers 113A to 113C close the blowing ports of the inner nozzles 45A to 45C. . However, when opening the exhaust passage 67, the blowing ports of the inner nozzles 45A to 45C may also be opened.

  That is, at the time of cooking using the superheated steam, for example, one minute before the end of cooking, cooking is performed by opening the exhaust passage 67 by the damper 68 and exhausting the superheated steam in the heating chamber 20 as described above. When the user opens the door 12 after the completion, the amount of steam in the heating chamber 20 that comes out before the door 12 is reduced so that the user is not burned. At that time, in order to prevent condensation on the steam heater 52 in the steam temperature raising device 50, for example, 30 seconds before the end of cooking, the steam heater 52 is energized, and the inner nozzle 45A is provided by the dampers 113A to 113C. The blower opening of ~ 45C is opened, and the vapor evaporated from the steam heater 52 is exhausted through the heating chamber 20 together with the steam in the dish-shaped case 51.

  Moreover, in the said embodiment, the case of the heating cooker 1 provided with the said steam temperature rising apparatus 50 and heating the to-be-heated material 90 with the superheated steam from the steam temperature rising apparatus 50 is mentioned as an example. Explains. However, in the present invention, in the case of a heating cooker capable of switching between cooking by heating with superheated steam and cooking by heating with non-superheated steam, there is no steam temperature raising device 50, and the object to be heated by non-superheated steam from the steam generator 40 is used. Needless to say, the present invention can also be applied to a cooking device for heating an object.

It is an external appearance perspective view in the heating cooker of this invention. It is an external appearance perspective view of the state which opened the door of the heating cooker shown in FIG. It is a schematic block diagram of the heating cooker shown in FIG. It is a control block diagram of the heating cooker shown in FIG. It is a detailed longitudinal cross-sectional schematic diagram of the vapor | steam suction ejector in FIG. It is a figure which shows an example of the damper which opens and closes the blowing inlet of the inner nozzle in FIG. It is a figure which shows an example of the cam shaft and cam in FIG. It is a figure which shows the contact state of a cam and a cam follower in case the opening angle of a damper is 60 degree | times. It is a figure which shows the contact state of a cam and a cam follower in case the opening angle of a damper is 90 degree | times. It is explanatory drawing of the rotational force which the force of a cam gives to a cam follower. FIG. 6 is a longitudinal sectional view of a vapor suction ejector and an exhaust passage different from those in FIG. 5. It is a figure which shows an example of the cam shaft and cam in FIG.

Explanation of symbols

1 ... Heat cooker,
20 ... heating chamber,
40 ... steam generator,
44 ... Vapor suction ejector,
45 ... Inner nozzle,
50 ... Steam temperature raising device,
68,113 ... Damper,
80 ... control device,
114, 118 ... cam followers,
115,119 ... axis,
116 ... camshaft,
117, 127 ... Cam.

Claims (5)

A steam generator for generating steam;
A heating chamber for heating an object to be heated by steam supplied from the steam generator;
A steam suction ejector that sucks the steam generated by the steam generator from the suction port, and blows out the gas from the plurality of blowing ports to the heating chamber from a plurality of outlets;
A plurality of first dampers provided on one rotating shaft and opening and closing the plurality of blowing ports in the steam suction ejector;
A plurality of first cams fixed to one rotating shaft and closing the plurality of first dampers;
When the plurality of first cams rotate in a direction to close the plurality of first dampers, the plurality of first cams sequentially contact the plurality of cam followers provided in the plurality of first dampers with a predetermined phase difference. A cooking device characterized by being arranged to contact. The heating cooker according to claim 1, wherein
An exhaust passage for discharging steam in the heating chamber to the outside;
The rotating shaft provided with the plurality of first dampers is fixed to the rotating shaft to which the second damper for opening and closing the exhaust passage and the plurality of first cams are fixed, and A heating cooker comprising a second cam for closing the second damper. The cooking device according to claim 2,
The plurality of first cams and the second cam are:
When the second damper is opened, all the first dampers are already opened,
The heating cooker characterized in that the second damper closing start is arranged to have a phase difference from the closing start of all the first dampers. The cooking device according to claim 2,
The plurality of first cams and the second cam are:
When the second damper is opened, all the first dampers are already closed,
The heating cooker characterized in that the second damper closing start is arranged to have a phase difference from the closing start of all the first dampers. The heating cooker according to claim 1, wherein
The plurality of blowing ports in the vapor suction ejector are formed in a vertical direction,
The opening angle of the first damper when the first damper is opened is an initial contact point that is a position where the first cam first contacts the cam follower when the first damper is closed. The angle formed by the plane passing through the axis of the rotation axis of the first damper and the plane passing through the axis of the rotation axis of the first cam and the initial contact point is the opening of the first damper. A cooking device characterized by being set to be larger than the above-mentioned angle when the angle is 90 degrees.

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