JP6070409B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker that feeds heated air into a cooking chamber and heats an object to be cooked in the cooking chamber to cook.

  In patent document 1, the 1st casing provided with the hot-air fan and the hot-air heater is covered with the 1st ventilation hole formed in the 1st casing in the heating cooker arrange | positioned in the back | inner part of a cooking cabinet. As described above, by providing the second casing having the second ventilation hole, the hot air blown out from the second ventilation hole is supplied into the cooking chamber in a rectified state, and the food to be cooked in the cooking chamber is A product that suppresses uneven heating has been proposed.

  In Patent Literature 2, a hot air fan and a heating means are provided in a casing partitioned by a cooking chamber and a partition wall, and a ventilation hole is provided in the partition wall, and the position of the ventilation hole is changed by the ventilation hole variable means. There has been proposed a cooking device that changes the amount of hot air flowing through the cooking chamber by controlling the number of revolutions of the hot air fan, thereby reducing uneven baking of the object to be cooked.

  Patent Document 3 discloses a heating cooker that heats a heater disposed in a casing, rotates a hot air fan, circulates hot air in a cooking chamber, and cooks, to a rotating shaft of a hot air motor that drives the hot air fan. There has been proposed a self-cooling fan that is fixed in a rotating manner and a hot-air motor installed in a duct is cooled by the self-cooling fan. Such a self-cooling fan is also disclosed in another patent document 4.

  Patent Document 5 includes a centrifugal fan disposed in a casing having a plurality of outlets as a blower for a heating cooker that sends hot air into a cooking chamber, and a motor that rotates the centrifugal fan forward and backward. The idea of changing the air volume ratio among a plurality of air outlets by rotating forward or reverse is proposed.

JP 2010-1117069 A JP 2006-275390 A JP2012-37164A JP 2010-32149 A JP 2003-214398 A

  In the heating cookers of Patent Documents 1 and 2, the heating means is heated in the casing, the heated air is blown out from the vent hole to the cooking chamber with a hot air fan, and the hot air is circulated in the cooking chamber. However, the control by the number of rotations of the hot air fan and the adjustment by the position of the ventilation hole provided in the partition wall cannot solve the uniform temperature distribution in the cooking cabinet, and the heating unevenness of the cooking object becomes a problem. It was.

  In the cooking devices of Patent Documents 3 and 4, a duct is installed outside a casing having a heater and a hot air fan, and a hot air motor is provided in the duct. Since there is a heat source and the temperature of the hot air motor alone increases, a self-cooling fan is provided as a cooling measure for the hot air motor. However, the self-cooling fan is merely for blowing air to the hot air fan, and the self-cooling fan does not rotate when the hot air motor is stopped. Since the self-cooling fan also rotates in the opposite direction to the forward direction, the temperature rise of the hot air motor installed in the duct cannot be effectively suppressed.

The present invention has been made in view of the above problems, to improve the temperature unevenness of the heated air present in the cooking chamber, purpose to provide a heating cooker capable of reducing uneven heating of the food to.

In invention of Claim 1, by providing the ventilation hole match | combined with control of the rotation speed and rotation direction of a hot-air fan, the temperature nonuniformity of the heated air which exists in a cooking chamber is improved, and the nonuniformity heating of a to-be-cooked object Can be provided. In addition, in order to circulate the same amount of hot air symmetrically from the inner wall surface in the cooking chamber, a plurality of ventilation holes are formed in the inner wall surface of the cooking chamber, and the number of rotations and the direction of rotation of the hot air fan are controlled. Therefore, it is possible to reduce the heating unevenness of the object to be cooked at low cost without changing the position of the vent hole. And it becomes possible by making a hot-air fan as a hot-air supply means the shape which can circulate the same amount of hot air symmetrically from the inner wall face of a cooking chamber, and can make temperature distribution in a cooking chamber more uniform. Moreover, the hot air blown from the hot air fan can be efficiently fed into the cooking chamber regardless of whether the hot air fan rotates in the forward or reverse direction. Moreover, since the hot air from the vent hole located above the hot air fan is convected so as to wrap the entire cooking chamber from the ceiling wall formed in the dome shape, the temperature distribution in the cooking chamber can be more effectively reduced in this respect as well. It can be made uniform.

In invention of Claim 2 , the heating means as a hot-air supply means is made into the shape which can circulate the same amount of hot air symmetrically from the inner wall surface of a cooking chamber, and can make temperature distribution in a cooking chamber more uniform. It becomes possible.

In invention of Claim 3 , it is possible to make temperature distribution in a cooking chamber more uniform by making the casing as a hot air supply means into the shape which can circulate the same amount of hot air symmetrically from the inner wall surface of a cooking chamber. become.

According to invention of Claim 1, the heating cooker which can improve the temperature nonuniformity of the heated air which exists in a feeding cooker, and can reduce the heating nonuniformity of a to-be-cooked object can be provided. Moreover, it becomes possible to reduce the uneven heating of the object to be cooked at a low cost without changing the ventilation holes. And it becomes possible to make temperature distribution in a cooking chamber more uniform.

According to invention of Claim 2 , 3 , it becomes possible to make temperature distribution in a cooking chamber more uniform.

It is a front view of the state which removed the door of the heating cooker which shows one Example of this invention. It is explanatory drawing which shows control of a hot air motor, and the flow of the hot air in a cooking chamber same as the above. It is a front view of the state which removed the door and back wall of the cooking-by-heating machine which shows the internal structure of a casing and a duct same as the above. It is a side view of the heating cooker which shows the internal structure of a casing and a duct same as the above. It is a side view of a hot air fan same as the above. It is a perspective view of a hot air fan same as the above. It is a front view of a cooling fan same as the above. It is a block diagram showing an electrical configuration same as the above.

  Hereinafter, a preferred embodiment of a heating cooker according to the present invention will be described with reference to FIGS.

  1 to 4, reference numeral 1 denotes a substantially rectangular box-shaped main body that forms an outline of a heating cooker, and the main body 1 has an open front surface for storing an object to be cooked such as food. The cooking chamber 2 is disposed. The peripheral wall forming the cooking chamber 2 is composed of a ceiling wall 2a, a bottom wall 2b, a left side wall 2c, a right side wall 2d, and a back wall 2e, and has a dome shape in which the ceiling wall 2a is expanded upward. Each of the walls 2b to 2 except the ceiling wall 2a forms a flat cooking chamber. Although not shown here, in addition to a door that can be opened and closed to close the front surface of the cooking chamber 2, a key 41 as an operation means, a display 43 that performs necessary display, and the like are disposed on the front surface of the main body 1. (See FIG. 8).

  Reference numeral 3 denotes hot air supply means provided in the back of the cooking chamber 2. This hot air supply means 3 includes a casing 5 that shares the back wall 2e, a hot air heater 6 as a heating means for heating air, a hot air fan 7 that feeds and circulates the heated air into the cooking chamber 2, and hot air The heating chamber 9 is configured by a hot air motor 8 that rotates the fan 7 in the forward direction or the reverse direction, and a hot air heater 6 and a hot air fan 7 are respectively disposed in a heating chamber 9 formed in the casing 5. A hot-air motor 8 is disposed outside 5. The hot air fan 7 of the present embodiment is provided as a so-called centrifugal fan that discharges air taken in the axial direction in a radial direction perpendicular to the axial direction by centrifugal force during rotation. The tubular hot air heater 6 is a hot air fan 6. 7 is disposed around the radial direction. For example, a sheathed heater, a mica heater, a quartz tube heater, or a halogen heater is used as the hot air heater 6 that is also a heat generating portion.

  A plurality of ventilation holes 11 are formed in the back wall 2e of the cooking chamber 2 so that the interior of the cooking chamber 2 communicates with the interior of the casing 5 through the ventilation holes 11. Here, regardless of the direction and number of rotations of the hot air fan 7, the same amount of hot air is circulated from the inner wall surface of the cooking chamber 2 without changing the position of the ventilation holes 11, so that the temperature in the cooking chamber 2 is increased. The central ventilation hole 11a is disposed so as to face the air intake portion of the hot air fan 7, and the hot air is disposed in a substantially rectangular shape around the outer periphery of the central ventilation hole 11a. An upper ventilation hole 11b, a lower ventilation hole 11c, a left ventilation hole 11d, and a right ventilation hole 11e are arranged so as to face the heater 6, and the hot air fan 7 is viewed from the front of the cooking chamber 2. A plurality of ventilation holes 11 are formed in the back wall 2e forming the inner wall surface of the cooking chamber 2 at symmetrical positions surrounding the entire outer periphery. In particular, the upper ventilation hole 11b and the lower ventilation hole 11c have one end and the other end so that hot air can be fed into the cooking chamber 2 more efficiently regardless of the rotation direction and the rotation speed of the hot air fan 7. It extends at the same distance from the radially outer end of the hot air fan 7 and is formed into a single continuous horizontally long slit.

  Further, the casing 5 and the hot air heater 6 are also shaped so that the same amount of hot air can be circulated symmetrically from the inner wall surface of the cooking chamber 2 through the ventilation holes 11 in order to make the temperature in the cooking chamber 2 uniform. Formed.

  In this embodiment, when cooking with hot air, the driving of the hot air motor 8 is controlled by a motor drive signal from a control means (not shown) so that the hot air fan 7 operates in a desired rotation speed and rotation direction. It has the structure which controls electricity supply of the hot air heater 6 with another heater electricity supply signal from a control means. Thereby, when the hot air fan 7 is rotationally driven, the air sucked into the casing 5 from the inside of the cooking chamber 2 through the central ventilation hole 11a blows out in the radial direction of the hot air fan 7 and hits the hot air heater 6 that has generated heat. Hot air is generated inside the casing 5. The hot air is sent into the cooking chamber 2 from the upper, lower, left, and right ventilation holes 11b, 11c, 11d, and 11e provided around the radial direction of the hot air fan 7, and the hot air is circulated inside and outside the cooking chamber 2 through the ventilation holes 11. By doing so, the flow S of hot air as shown by the white arrow in FIG. 2 is generated in the cooking chamber 2, and the cooking object in the cooking chamber 2 is heated and cooked.

  As shown in FIG. 3, in order to circulate the heated air uniformly in the cooking chamber 2 by feeding the uniform hot air into the cooking chamber 2 in which the object is to be cooked, a hot air fan 7 is provided outside the casing 5. Are arranged in the forward direction and a reverse rotation motor 13 that rotates the hot air fan 7 in the reverse direction. Both the forward rotation motor 12 and the reverse rotation motor 13 constituting the hot air motor 8 are installed in the convex duct 15 attached to the rear of the casing 5 and are arranged in the vicinity of the hot air heater 6. Thus, an AC motor having a relatively high operation guarantee temperature is used. Reference numeral 16 denotes a cooling means for suppressing hot air flowing inside the duct 15. The cooling means 16 is for circulating the heated air in the duct 15 in which the hot air motor 6 is installed, and is preferably arranged inside the duct 15 as in this embodiment.

  The forward rotation motor 12 is attached to the center of the back of the main body 1, and the rotation shaft 17 projects into the casing 5 and is directly connected to the center of the hot air fan 7. Thereby, when the forward rotation motor 12 is driven, the hot air fan 7 can be directly rotated forward. The rotation direction R1 at this time is indicated by a white arrow in FIG.

  On the other hand, the reverse rotation motor 13 is attached to the upper right of the forward rotation motor 12 in the front view of the cooking device. Pulleys (not shown) are attached and fixed to the rotation shaft 17 of the forward rotation motor 12 and the rotation shaft 18 of the reverse rotation motor 13, respectively, and both pulleys are connected via a power transmission device 19. Thus, when the hot air fan 7 is rotated in the reverse direction, the drive of the forward rotation motor 12 is stopped while the reverse rotation motor 13 is driven, and the power from the reverse rotation motor 13 is rotated via the power transmission device 19. By transmitting to the shaft 17, the hot air fan 7 connected to the rotating shaft 17 can be reversely rotated. The rotation direction R2 at this time is indicated by a white arrow in FIG.

  In this embodiment, a belt is used for the power transmission device 19, but a gear or the like can also be used. Further, the reverse rotation motor 13 may be attached to any position of the main body 1 as long as it can be connected to the forward rotation motor 12 via the power transmission device 19.

  A convex cover 21 covers the casing 5 and the duct 15 and forms the rear wall surface of the main body 1. The cover 21 is formed with a plurality of air direction ports 22 that allow air to flow between the outside of the main body 1 and the inside of the duct 15. In this embodiment, the rear surface, which is the installation surface of the duct 15, is brought into close contact with the rear wall surface of the cover 21 having the wind direction opening 22, and a hole (not shown) is provided on the rear surface of the duct 15 so as to face the wind direction portion 22. Thus, a ventilation path 23 for taking outside air around the main body 1 into the duct 15 is formed.

  5 and 6 show the configuration of the hot air fan 7 alone. The hot air fan 7 is required to have a shape in which the hot air blowing direction and the air volume are not significantly different between the forward rotation and the reverse rotation, the hot air blowing direction is the opposite direction, and the air volume is the same. The hot air fan 7 of the present embodiment is an annular plate having two bent portions on the outer peripheral edge of a circular plate-like rotor portion 25 that is mounted around a rotating shaft 17 of a hot air motor 8 (not shown). This is a centrifugal fan in which a plurality of portions 26 are attached at equal intervals. Each plate portion 26 has the same shape, and is provided with wings 27 standing vertically along the axial direction of the hot air fan 7. The wings 27 are straight and symmetrical with respect to the center of the hot air fan 7. That is, it is arranged on a straight line passing through the center of the hot air fan 7 and the end of the blade 27 on the fan center side. With such a shape of the hot air fan 7, the amount of air blown by the forward rotation and the reverse rotation is the same, and the same hot air amount can be circulated symmetrically from the inner wall surface of the cooking chamber 2.

  Note that the hot air fan 7 has a shape in which the hot air blowing direction and the air volume are not significantly different between the forward rotation and the reverse rotation, and the hot air blowing direction is the opposite and the air volume is the same. A shaped fan may be used, and a sirocco fan, a radial fan, a turbo fan, or the like may be used.

  FIG. 7 shows the blades 28 constituting the cooling means 16. The blades 28 are disposed radially on the outer peripheral side of the boss portion 29 and a cylindrical cup-shaped boss portion 29 connected to the rotation shaft of a cooling motor 45 (see FIG. 8) not shown here. The axial fan includes a plurality of fan blades 30. The blades 28 are housed in a space in the duct 15 together with the hot air motor 8 and the power transmission device 19, and the blades 28 are impeller-shaped (impellers) in order to arrange the cooling means 16 in the limited space. Shape). Further, the cooling motor 45 of the cooling means 16 serving as a driving source of the blades 28 is provided separately from the hot air motor 8, and even when the forward rotation motor 12 and the reverse rotation motor 13 are stopped, the blades 28 are uniquely provided. The heated air in the duct 15 generated by heat exchange with the hot air motor 8 is circulated. The cooling motor 45 is preferably provided outside the duct 15 in consideration of the heat effect of the cooling motor 45. However, if the cooling means 16 has sufficient cooling capacity, the cooling motor 45 is placed inside the duct 15. It may be provided.

  In FIG. 8 showing the electrical configuration, reference numeral 40 denotes a control circuit as a control means including a microcomputer (microcomputer), which controls each part of the heating cooker, a CPU as an arithmetic processing means, A memory as a storage means, an input / output device and the like are provided. The input port of the control circuit 40 is electrically connected with a key 41 as an operation means, a rotation detection means 42 for detecting the number of revolutions of the hot air fan 7, and a temperature detection means 43 for detecting the temperature in the cooking chamber 2. The output port of the control circuit 40 includes a display 44 as a display means, a hot air heater 6 as a heating means, a forward rotation motor 12 and a reverse rotation motor 13 constituting a hot air motor 8, and a cooling motor 45. Are electrically connected via a power supply circuit (not shown). As a result, the control circuit 40 causes the display 4 to display what is input by the key 2.

  The control circuit 40 is, for example, a cooking menu selected by an operation input from the key 2, a detection output from the rotation detection means 42, a detection output from the temperature detection means 43, or a timer means (see FIG. By generating a hot air motor drive signal corresponding to a time count (not shown) and operating either the forward rotation motor 12 or the reverse rotation motor 13 with a desired drive voltage, the number of rotations and rotation of the hot air fan 7 are increased. The hot air fan control means 48 for controlling the direction and a cooling motor drive signal different from the hot air motor drive signal are generated, and the cooling motor 45 is operated at a desired drive voltage, so that the number of rotations and rotation of the hot air fan 7 are increased. Cooling motor control means 49 that independently controls the operation of the blades 28 constituting the cooling means 16 regardless of the direction.

  Next, the effect | action is demonstrated about the heating cooker of the said structure. After the cooking chamber 2 has been cooked in advance, the door is closed and a cooking menu for cooking with hot air is selected using a key. Then, when a cooking start instruction is input, the control circuit 40 turns on the hot air heater 6. A heater energization signal for energizing is generated. The hot air motor control means 48 incorporated in the control circuit 40 generates a hot air motor drive signal so that the hot air fan 7 rotates in a desired rotation speed and rotation direction.

  Specifically, when the hot air fan 7 is normally rotated in the rotation direction R1 shown in FIG. 2, the hot air motor control means 48 does not supply a drive voltage to the reverse rotation motor 13 but performs a desired rotation to the normal rotation motor 12. The hot air motor 8 is controlled so as to supply a driving voltage corresponding to the number. On the other hand, when the hot air fan 7 is reversely rotated in the rotation direction R2 shown in FIG. 2, the hot air motor control means 48 does not supply the drive voltage to the normal rotation motor 12 and matches the desired rotation speed of the reverse rotation motor 13. The hot air motor 8 is controlled so as to supply the drive voltage. As a result, the hot air fan 7 changes its rotational speed by the hot air motor 8 and repeats forward and reverse rotations at a predetermined cycle.

  When the hot air fan 7 rotates forward or backward, the air sucked into the heating chamber 9 in the casing 5 from the inside of the cooking chamber 2 through the central ventilation hole 11a is moved in the rotational direction of the wings 27 by the centrifugal force of the hot air fan 7. While being pushed by the surface, it blows out in the radial direction, hits the heated hot air heater 6 surrounding the substantially entire circumference of the hot air fan 7, and generates hot air in the heating chamber 9 isolated from the cooking chamber 2. Hot air hitting the hot air heater 6 is sent from the heating chamber 9 into the cooking chamber 2 through the upper, lower, left, and right ventilation holes 11b, 11c, 11d, and 11e that are opened at positions facing the hot air fan 6. As a result, hot air circulates inside and outside the cooking chamber 2 through the ventilation holes 11, and a hot air flow S shown in FIG. 2 is generated in the cooking chamber 2, and the food to be cooked in the cooking chamber 2 is cooked. The

  In the series of operations described above, when the hot air fan 7 is rotated forward and when the hot air fan 7 is rotated in the reverse direction, the surface in the rotational direction of the wings 27 against which air (hot air) is pressed is opposite to the outer periphery of the hot air fan 7. However, in this embodiment, since the straight wings 27 are arranged symmetrically with respect to the center of the hot air fan 7, hot air blows out from the hot air fan 7 when the hot air fan 7 is rotated forward and backward. The direction is opposite to the wing 27, and the air volume in each case is the same without any deviation.

  Further, a hot air heater 6 is disposed so as to surround the entire radial direction of the hot air fan 7, and a vent hole 11 is formed in the inner wall 2 e of the cooking chamber 2 so as to face the hot air heater 6. In addition, by devising the shape of the casing 5 so that the hot air is guided to the vent hole 11 along the inner surface of the casing 5, the direction in which the hot air flows is the opposite every time the rotation direction of the hot air fan 7 is switched. However, it is possible to circulate the same amount of hot air symmetrically from the inner wall surface of the cooking chamber 2 through the vent hole 11 from the hot air heater 6 without locally decreasing the amount of hot air. Thus, by considering not only the shape of the hot air fan 7, the casing 5, and the hot air heater 6, but also the position of the vent hole 11 formed in the back wall 2e of the cooking chamber 2, as in this embodiment, Without adding a mechanism for changing the position of the vent hole 11, it is possible to make the temperature distribution in the cooking chamber 2 uniform at a low cost and to reduce uneven heating of the cooking object in the cooking chamber 2. .

  Further, here, in order to eliminate variation in the temperature distribution in the cooking chamber 2, the air volume corresponding to the rotational speed of the hot air fan 7 and the air direction corresponding to the rotational direction of the hot air fan 7 are controlled by the hot air motor control means 48. However, by arranging the ventilation holes 11 in accordance with the control, the temperature unevenness of the heated air existing in the cooking chamber 2 is improved, and the heat unevenness of the object to be cooked is reduced. In particular, the upper ventilation hole 11b and the lower ventilation hole 11c are each longer than the radial outer diameter of the hot air fan 7, and one end and the other end thereof extend the same distance as the radial outer end of the hot air fan 7, Even if the rotating direction of the hot air fan 7 is forward or reverse, the hot air blown from the hot air fan 7 does not stay in the heating chamber 9 and the hot air is more efficiently generated in the cooking chamber 2. Can be sent in. Moreover, the hot air from the upper ventilation hole 11b is convected from the ceiling wall 2a formed in a dome shape along the left side wall 2c and the right side wall 2d so as to wrap the entire cooking chamber 2, so that the cooking chamber is also used in this respect. The temperature distribution in 2 can be made uniform more effectively.

  When the temperature of the forward rotation motor 12 and the reverse rotation motor 13 constituting the hot air motor 8 increases in the internal space of the duct 15 with the cooking of the cooking object, the cooling motor control means 49 causes the temperature of the hot air motor 8 to increase. A cooling motor drive signal for operating the cooling motor 45 of the cooling means 16 is generated for the purpose of suppressing the rise and cooling the hot air motor 8. When the blade 28 connected to the cooling motor 45 rotates in response to this cooling motor drive signal, a blower path 23 is formed for taking outside air around the main body 1 into the duct 15 through the airflow direction portion 22, and is formed in the internal space of the duct 15. The heated air is circulated and the temperature rise of the hot air motor 8 is suppressed.

  In particular, unlike the self-cooling fan that only blows air to the hot air motor 8, the blades 28 of the present embodiment can circulate the heated air over the inside of the duct 15, and the forward rotation motor 12 and the reverse rotation motor. 13, and is driven to rotate by a cooling motor 45 that is separate from the hot air motor 8, so that the temperature rise of the hot air motor 8 installed inside the duct 15 can be effectively suppressed. Further, in this embodiment, heat is transferred from the casing 5 in which the hot air heater 6 is installed to the inside of the duct 15, but the air that has become hot inside the duct 15 due to the heat is efficiently converted by the cooling means 16. The hot air motor 8 can be cooled by circulating it well.

  The rear surface of the duct 15 is brought into close contact with the rear wall surface of the cover 21 having the wind direction opening 22, and the air passage 23 between the outside of the main body 1 and the inside of the duct 15 is made shortest so that a limited space is provided at the rear portion of the main body 1. A duct 15 can be arranged. Further, by forming the air passage 23 to the inside of the duct 15 using the air direction port 22, it is possible to realize an arrangement with good cooling efficiency for the hot air motor 8. Furthermore, if the impeller-shaped blades 28 are installed as the cooling means 16 inside the duct 15, the blades 28 can be arranged in a limited space inside the duct 15.

  As mentioned above, in the said Example, the heating chamber 9 which is the interior space of the casing 5 which provided the cooking chamber 2 as a cooking chamber into which to-be-cooked objects, such as foodstuffs, and the cooking chamber 2 were provided. The casing 5 includes a hot air fan 7 for sending the air heated in the heating chamber 9 into the cooking chamber 2 in addition to the hot air heater 6 as a heating means for heating the air. The heating cooker is provided with hot air fan control means 49 as control means for controlling the rotation speed and rotation direction of the hot air fan 7, and the cooking chamber is adapted to the rotation speed and rotation direction of the hot air fan 7. The ventilation hole 11 is provided so that the temperature in 2 may become uniform.

  In this case, by providing the ventilation holes 22 in accordance with the control of the rotation speed and the rotation direction of the hot air fan 7, the temperature unevenness of the heated air existing in the cooking chamber 2 is improved, and the heating unevenness of the cooking object is reduced. It becomes possible to reduce.

  Further, in this embodiment, the ventilation hole 11 through which the heated air from the heating chamber 9 passes is in a position where the same amount of hot air can be circulated symmetrically from the inner wall 2e which is the inner wall surface of the cooking chamber. A plurality of the inner walls 2e of the cooking chamber 2 are formed.

  In this case, a plurality of ventilation holes 11 are formed in the back wall 2e of the cooking chamber 2 so as to circulate the same amount of hot air symmetrically from the back wall 2e of the cooking chamber 2, and the rotational speed and rotational direction of the hot air fan 7 are determined. Since the temperature distribution inside the cooking chamber 2 is adjusted by the control, it is possible to reduce unevenness in heating of the object to be cooked at a low cost without changing the position of the vent hole 11.

Moreover, the hot air fan 7 of a present Example is formed in the shape which can circulate the same amount of hot air symmetrically from the back wall 2e of the cooking chamber 2 when it rotates forward / reversely .

In this case, the hot air fan 7 as the hot air supply means is shaped so that the same amount of hot air can be circulated symmetrically from the back wall 2e of the cooking chamber 2 when the hot air fan 7 is rotated forward and backward. Can be made more uniform.

Further, the peripheral wall forming the cooking chamber 2 of the present embodiment has a back wall 2e as an inner wall surface and a ceiling wall 2a formed in a dome shape, and is a ventilation hole located above the hot air fan 7. The ventilation hole 11b and the lower ventilation hole 11c which is a ventilation hole located below extend at the same distance from the radial outer end of the hot air fan 7 at one end and the other end, and each is a single continuous horizontally long slit. It is formed in a shape.

  Thereby, the hot air blown out from the hot air fan 7 can be more efficiently sent into the cooking chamber 2 regardless of whether the hot air fan 7 rotates in the forward or reverse direction. Moreover, since the hot air from the upper ventilation hole 11b convects from the ceiling wall 2a formed in a dome shape so as to wrap the entire inside of the cooking chamber 2, the temperature distribution in the cooking chamber 2 can be more effectively reduced in this respect as well. It can be made uniform.

  Moreover, the hot air heater 6 of a present Example is formed in the shape which can circulate the same amount of hot air symmetrically from the back wall 2e of the cooking chamber 2. FIG.

  In this case, the temperature distribution in the cooking chamber 2 can be made more uniform by making the hot air heater 6 as the hot air supply means into a shape that can circulate the same amount of hot air symmetrically from the back wall 2e of the cooking chamber 2. It becomes possible.

  Moreover, the casing 5 of a present Example is formed in the shape which can circulate the same amount of hot air symmetrically from the back wall 2e of the cooking chamber 2. FIG.

  In this case, it is possible to make the temperature distribution in the cooking chamber 2 more uniform by forming the casing 5 as the hot air supply means in a shape that can circulate the same amount of hot air symmetrically from the back wall 2e of the cooking chamber 2. become.

  In the present embodiment, a cooking chamber 2 into which an object is to be cooked, a hot air fan 7 that sends heated air into the cooking chamber 2, a hot air motor 8 that rotates the hot air fan 7 forward and backward, and a hot air motor 8 are installed. Heating air in the duct 15 is circulated, and cooling means 15 provided separately from the hot air motor 8 is provided.

  In this case, it becomes possible to circulate the heated air in the duct 15 by the cooling means 16 regardless of whether the hot air motor 8 is in operation or not, and the temperature rise of the hot air motor 8 installed in the duct 15 is increased. It can be effectively suppressed.

  In this embodiment, the vanes 28 of the cooling means 15 are provided inside the duct 15.

  In this case, the air that has become hot inside the duct 15 by the heat transmitted from the casing 5 in which the hot air heater 6 exists as a heat source to the duct 15 can be efficiently circulated by the cooling means 16. Moreover, since the cooling means 16 can cool the hot air motor 8 inside the duct 15, the temperature rise of the hot air motor 8 can be more effectively suppressed without greatly changing the shape of the duct 15.

  In the present embodiment, the rear surface, which is the installation surface of the duct 15, is brought into close contact with the wall surface of the main body 1 as the cooker main body having a plurality of wind direction ports 22, and the air supply path 23 for taking outside air into the duct 15 is provided. Forming.

  In this case, by providing the installation surface of the duct 15 so as to be in close contact with the wall surface of the main body 1 having the wind direction port 22, the duct 15 can be disposed in a space-saving manner, and air is sent into the duct 15 using the wind direction port 22. By forming the path 23, an arrangement with good cooling efficiency can be realized.

  Further, the cooling means 16 of the present embodiment has a blade 28 provided inside the duct 15, and the blade 28 is formed in an impeller shape.

  In this case, impeller-shaped blades can be arranged in a space-saving manner inside the duct 15, and the amount of air blown as the cooling means 16 can be made more uniform.

  In addition, this invention is not limited to the said Example, A various change is possible in the range which does not deviate from the meaning of this invention. The shapes and positions of the casing 5, the hot air heater 6, the hot air fan 7, and the ventilation holes 11 shown in the above embodiment are merely examples, and it goes without saying that they can be appropriately changed as long as the same effects can be exhibited. Further, the shape and position of the cooling means 16 can be changed with the same concept.

1 body (cooker body)
2 Cooking room (cooker)
2a Ceiling wall 2e Back wall (inner wall surface)
5 Casing 6 Hot air heater (heating means)
7 hot air fan
1 1 ventilation holes
11b Upper ventilation hole (ventilation hole located above the hot air fan)
11c Lower ventilation hole (ventilation hole located below the hot air fan)
4 8 Hot air fan control means (control means)

Claims (3)

A cooking chamber for storing an object to be cooked, and a vent hole for communicating the cooking chamber with a casing;
The casing includes a heating unit that heats air and a hot air fan that sends the heated air into the cooking chamber.
Control means for controlling the number of rotations and the direction of rotation of the hot air fan;
The peripheral wall forming the cooking chamber has an inner wall surface and a ceiling wall formed in a dome shape,
The vent holes through which the heated air passes are at positions where the same amount of hot air can be circulated symmetrically from the inner wall surface of the cooking chamber, and are formed in a plurality on the inner wall surface of the cooking chamber,
The hot air fan is formed into a shape that can circulate the same amount of hot air symmetrically from the inner wall surface of the cooking chamber when rotated forward and backward,
The ventilation holes located above and below the hot air fan have one end and the other end extending at the same distance from the radial outer end of the hot air fan, and each is formed as a single continuous horizontally elongated slit. A cooking device characterized by being made . The cooking device according to claim 1, wherein the heating means is formed in a shape capable of circulating the same amount of hot air symmetrically from the inner wall surface of the cooking chamber. The cooking device according to claim 1 or 2 , wherein the casing is formed in a shape capable of circulating the same amount of hot air symmetrically from an inner wall surface of the cooking chamber.

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