JP3863539B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker provided with an outlet from which air is blown so that the heating temperature in the heating chamber becomes uniform.

A conventional cooking device such as a convection oven has a fan for forcibly circulating hot air in the heating chamber, and the hot air circulation by the hot air circulation fan speeds up cooking and increases the cooking speed. The temperature distribution is made uniform and the baking performance is improved.

  Depending on the model, the cooking device has an oven cooking function, an electromagnetic heating cooking function, a dielectric heating cooking function, a steam cooking function, and a combined cooking function of oven, electromagnetic heating, dielectric heating, and steam.

  FIG. 8 is a front view of a conventional cooking device, FIG. 9 is a diagram showing the direction of air flow by a centrifugal fan, FIG. 10 is a distribution diagram of the heating condition on the surface of the upper plate of the conventional cooking device, FIG. These are figures which show the flow direction of the wind of the conventional heating cooker.

  As shown in FIG. 8, the conventional heating cooker includes a box 11 that has been heat-insulated by heat insulating means, a heating chamber 12 that is provided in the box 11 and cooks the contents S therein, A heat insulating door 15 that freely opens and closes the front opening of the heating cabinet 12, a heater 13 for generating hot air, a blower 20, an operation unit 16 for inputting instructions from a user, and the heater 13 And a control unit (not shown) for controlling the blower 20. In addition, the stored item S is a single food item.

  The heating chamber 12 includes left and right side walls 31, a back wall 32, a top wall 33, and a bottom wall 34, and the blower 20 is provided on the back side of the back wall 32. Two support portions 19 are formed on the side wall 31 so as to support the mounting trays 40a and 40b so as to be retractable. The back wall 32 is formed with a suction port 17 and air outlets 18a to 18c formed by a plurality of holes. The suction port 17 is arranged in the center of the back wall 32.

  The air outlets 18a to 18c include a first air outlet 18a, a second air outlet 18b, and a third air outlet 18c. The 1st blower outlet 18a is distribute | arranged above the upper stage mounting tray 40a, and is formed in a strip | belt shape along the long side of the back wall 32. As shown in FIG. The second outlets 18b are respectively arranged in the vicinity of the left and right side walls 31 in the middle of the upper stage mounting tray 40a and the lower stage mounting tray 40b, and are formed in a small circular shape. The 3rd blower outlet 18c is distribute | arranged below the lower stage mounting tray 40b, and is formed in strip | belt shape along the long side of the back wall 32. As shown in FIG.

  The blower 20 includes a centrifugal fan 22, a drive motor 23 that drives the centrifugal fan 22, and a fan casing 21 that supports the centrifugal fan 22. The suction port of the centrifugal fan 32 faces the suction port 17. Around the centrifugal fan 22, an annular heater such as a sheathed heater is disposed. The fan casing 21 covers the back side of the back wall 32 and forms a space surrounding the centrifugal fan 22 and the heater 13. 9, D is the first corner at the upper left of the fan casing 21 when the fan casing 21 is viewed from the front, E is the second corner at the upper right of the fan casing 21, and F is the third corner at the lower right of the fan casing 21. , G represents the fourth corner at the lower left of the fan casing 21.

  In such a heating cooker, when the placing plate 40 a on which the contents S are placed is placed in the heating chamber 12 and the cooking content is input from the operation unit 16, the control unit responds to the instruction input from the operation unit 16. Based on this, the heater 13, the blower 20, and the like are driven and controlled to start cooking the contents S. The air blown out by the centrifugal fan 22 is heated by the heater 13 to become hot air, and the hot air is blown out from the air outlets 18a to 18c. The hot air blown out from the air outlets 18 a to 18 c flows toward the front surface in the heating chamber 12, hits the heat insulating door 15, changes the flow direction, concentrates in the center, and is sucked from the suction port 17 by the suction force of the blower 20. The

  By the way, the wind in the fan casing 21 follows the rotation direction (clockwise) of the centrifugal fan 22 as indicated by an arrow I in FIG. It flows in a spiral toward. Therefore, for example, when it is formed in a band shape along the long side of the back wall 32 like the first blower outlet 18a and the third blower outlet 18c, as shown in FIG. Wind is blown into the heating chamber 12 by the flow. The wind blown into the heating chamber 12 flows toward the door 15 along the side wall 31, the top wall 33, and the bottom wall 34. The heat accumulates in the side wall 31 on the flow direction side, and the heating condition in the heating chamber 12 is not uniform.

  Therefore, as for the distribution of the heating condition on the upper stage tray 40a, as shown in FIG. 10, the overheated portion is spread in the vicinity of the side wall 31 on the flow direction side. In addition, the distribution of such a heating condition is the same also under the lower stage tray 40b.

  As a cause of such heating unevenness, it is conceivable that the air flow is biased by the flow of the spiral wind unique to the centrifugal fan 22. The wind blown into the heating chamber 12 is blown out in the flow direction as indicated by an arrow H in FIG.

  In addition, even on the reverse direction side opposite to the flow direction, due to the following reasons, although it is not improperly heated, unevenness in the distribution of the heating condition that looks unnatural occurs.

  As shown by an arrow I in FIG. 9, the air in the fan casing 21 flows in a spiral shape toward the four corners D to G of the fan casing 21 and has an effect of directing the flow into the heating chamber 12. The four corners D to G of the casing 21 are blown out. Therefore, the wind blown out from the four corners D to G of the fan casing 21 is larger than the wind blown out from the outlet provided at the intermediate position of the four corners D to G. That is, the central portion of the heating chamber 12 is determined by the difference between the amount of air blown from the outlet of the first corner D and the amount of air blown from the intermediate outlet between the first corner D and the second corner E. This produces a highly heated part.

  Moreover, the hot air blown from the centrifugal fan 22 is concentrated and compressed at the four corners D to G of the fan casing 21. Therefore, the wind blown out from the four corners D to G of the fan casing 21 has a higher speed of blowing than the wind blown from the outlet provided in the intermediate position between the four corners D to G. Therefore, for example, the hot air blown out from the outlet of the first corner D flows to the door 15 side without staying on the side wall 31 side and the back wall 31 side on the opposite direction side of the upper loading tray 40a. A non-heated portion is generated on the wall 32 side, and a high-heated portion is generated on the door 15 side of the upper tray 40a.

  Therefore, in Patent Document 1, the opening area of the air outlet changes in an inverse proportion according to the air volume along the air outlet end side where the air volume increases due to the rotation of the centrifugal fan and the air outlet end side where the air volume decreases. A cooking device is disclosed in which the heating temperature in the heating chamber is made uniform by causing the heating temperature to become uniform.

Further, in Patent Document 2, even if a heater (seeds heater) is double-wrapped around the hot air fan 18 in an annular manner and between the heater end portions led out to the outside, at least a single-winding portion is present. A heating cooker is disclosed in which the heating temperature in the heating chamber is made uniform by using a secured shape.
Japanese Patent Laid-Open No. 63-14016 (lower left of page 2 to upper right of page 3, FIG. 1) Japanese Patent Laying-Open No. 2004-93092 (paragraphs 0022 to 0031, FIG. 1)

  In patent document 1, the air volume blown from a blower outlet is adjusted by changing the opening area of a blower outlet. However, with this shape, only air volume adjustment in the horizontal width direction of the heating cabinet can be performed, so heating unevenness as shown in FIG. 10 cannot be improved.

  Moreover, in patent document 2, the air volume blown from a blower outlet is adjusted using a part of heater. However, the shape of the heater is defined for the purpose of suppressing the bias of the flow of wind, which is not preferable in terms of thermal efficiency. Therefore, there is a risk of uneven heating depending on the shape of the heater.

  Therefore, an object of the present invention is to provide a heating cooker that can cook food without unevenness so that the flow of air in the heating chamber is not biased.

  In order to achieve the above-mentioned object, the present invention is provided with a blower that forms a flow of air in the circumferential direction, and along the flow direction in which the wind from the blower flows on the wall surface of a heating chamber that houses the contents. An air outlet is formed, and in the heating chamber, in order to prevent heat from being collected on the wall surface side where the wind blown out from the air outlet hits, the wall surface on which the air outlet is formed is positioned on the flow direction side. A closed region in which the air outlet is not formed, and an air outlet region in which the air outlet is formed in a reverse direction opposite to the flow direction side are provided.

  Here, the flow direction side is a side close to the wall surface on which the wind blown out from the blower outlet is hit, and the reverse direction side is a side far from the wall surface.

  The heating chamber can accommodate a plurality of mounting dishes in the vertical direction, and a centrifugal fan is disposed outside the wall surface on which the air outlet is formed. A blowout region and a closed region are formed on the wall surface. The closed region is located on the flow direction side, that is, on the rotation direction side of the centrifugal fan. The blowing region is located on the reverse direction side, that is, on the reverse rotation direction side of the centrifugal fan. Moreover, the suction inlet which suck | inhales the air in a heating chamber in a blower is formed in the center of the wall surface in which the blower outlet was formed.

  The blow-out area is arranged at a position higher than the uppermost mounting tray stored in the heating chamber and at a position lower than the mounting tray stored in the lowermost stage. The blowing area is in a position biased to the opposite direction side. More specifically, it is formed in a range including a part on the reverse direction side beyond a bisector obtained by dividing the wall surface on which the air outlet is formed into two halves along the flow direction.

  A closed area | region is an area | region which is not forming the blower outlet so that the wind from an air blower may not be blown off to a heating store | warehouse | chamber, Comprising: It is distribute | arranged to the flow direction side. Thereby, for example, the wind from the blower is not blown out from the flow direction side at a position higher than the placing tray accommodated in the uppermost stage or a position lower than the placing dish accommodated in the lowermost stage.

  By the said structure, a wind can be blown in in a heating chamber from the blower outlet in a reverse direction side, and a wind is not blown out in a heating chamber in the flow direction side. Therefore, the wind blown out on the opposite direction side reaches the wall surface on the flow direction side by the flow of the spiral wind, and the wind spreads evenly in the lateral width direction of the heating chamber. Therefore, the heating condition in the heating chamber can be made uniform without heat accumulating on the wall surface on the flow direction side.

  Moreover, the wall surface of the heating chamber which accommodates a thing is formed in rectangular shape, and the centrifugal fan provided in the air blower is arranged in the center of this wall surface. At this time, the height of the heating chamber is T, and the width is W.

  In the cooking device having the above configuration, when the aspect ratio of the heating chamber is P = T / W, the aspect ratio P of the heating chamber is formed to be 0.7 or less. Therefore, the wind concentrated on the corner located on the flow direction side with respect to the long side, which is the horizontal side edge of the back wall, and on the opposite direction side with respect to the short side is reduced. Thereby, the difference of the air volume which blows off from the reverse direction side and flow direction side of a blower outlet is lose | eliminated, and the heating condition in a heating chamber can be made uniform.

  Moreover, an opening area becomes narrow as a blowing area | region goes to a reverse direction side. That is, the opening area on the reverse direction side of the outlet formed in the outlet region is smaller than that on the flow direction side. For example, the opposite side end of the blowing region is formed obliquely. That is, a triangular closed region is formed on the opposite side of the blowing region. Thereby, the opening area of the blowing region end becomes smaller than the opening area on the flow direction side.

  Also, in the straight line connecting the upper end and the lower end of the opposite side end of the blowout region, when the height from the upper end to the lower end of the straight line is t, the lateral width is w, and the inclination is p = t / w, The inclination p is formed so that P ≧ p. In this case, the wind concentrated on the reverse direction side of the fan casing is blown out by the spiral wind flow at the end portion on the reverse direction side of the air outlet. However, not all the wind is blown out by the triangular closed area. Therefore, the wind that has not been blown can be efficiently guided to the flow direction side. Thereby, there is no difference in the amount of air blown from the reverse direction side to the downstream side of the air outlet, and the wind does not concentrate on the central portion of the heating chamber.

  Moreover, the wind is not blown out from the portion blown out fastest by the triangular closed region. That is, the air is blown out from the outlet on the opposite side of the portion where the wind is blown out most quickly. Accordingly, the wind from the outlet is blown out at substantially the same blowing speed at any of the reverse side end, the central portion, and the flow direction side end. Therefore, the reach distance of the wind is equal in the heating chamber, and the uniform wind can be sent into the heating chamber, so that uneven heating can be suppressed.

  In addition, as a method of narrowing the opening area of the blowing region, the hole formed in the blowing region may be formed smaller toward the opposite direction side.

  According to the present invention, since the air outlet is provided in a direction opposite to the direction opposite to the flow direction, the wind is not blown into the heating chamber on the flow direction side, so that it is on the flow direction side. Heat does not accumulate near the wall surface.

  As a result, the air blown out from the air outlet provided on the wall surface is sent out evenly in the horizontal width direction and the depth direction of the heating chamber, and the wind hits the contents on the mounting tray without any unevenness. Can be cooked without heat.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a front view of a heating cooker according to an embodiment of the present invention, FIG. 2 is a side sectional view of the heating cooker, FIG. 3 is a view showing the direction of air flow in the heating cooker, and FIG. The distribution map of the heating condition on the surface is shown.

  As shown in FIG. 1 and FIG. 2, the heating cooker of the present invention is provided with a box body 11 that has been heat-insulated and opened at the front surface, and a heating chamber 12 that is housed in the box body 11 and stores the contents S. The heater 13 for heating the stored item S, the blower 20 for blowing out hot air heated by the heater 13, and a controller (not shown) for controlling the heater 13 and the blower 20 are provided.

  A heat insulating door 15 is provided on the front surface of the box 11 so as to be openable and closable, and an operation unit 16 for inputting instructions from the user is provided. A control unit including a microcomputer controls the blower 20, the heater 13, and the like based on an instruction input from the operation unit 16.

  The heating chamber 12 has two side walls 31, a back wall 32, a top wall 33, and a bottom wall 34, and a fan casing 21 of the blower 20 is attached to the back side of the back wall 32. On the left and right side walls 31, support portions 19 that support the mounting trays 40 a and 40 b are formed so as to protrude vertically by two steps. The mounting trays 40a and 40b have a dish-shaped mounting portion having an area equivalent to the horizontal section of the heating chamber 12 so that the contents S can be mounted thereon, and flange-shaped edges formed on the outer periphery of the mounting portion. The mounting trays 40 a and 40 b are accommodated in the heating chamber 12 by the edge portion being supported by the support portion 19. In addition, let the mounting tray mounted in the upper side be the upper stage mounting tray 40a, and let the mounting tray mounted in the lower side be the lower stage mounting tray 40b.

  The blower 20 includes a centrifugal fan 22 and a motor 23 that drives the centrifugal fan 22. The centrifugal fan 22 is rotatably supported by the fan casing 21 and is disposed to face the back wall 32. The rotational axis of the centrifugal fan 22 is located at the center of the back wall 32. The heater 13 is arranged concentrically around the centrifugal fan 22. As shown in FIG. 3, when the centrifugal fan 22 rotates clockwise, hot air is blown out from the centrifugal fan 22 in the centrifugal direction. And the flow of the hot air used as the flow direction which goes outside along the rotation direction of the centrifugal fan 22 is formed.

  The rear wall 32 is formed with a suction port 17 that sucks air in the heating chamber 12 into the fan casing 21 and outlets 18a to 18c that blow hot air heated by the heater 13 into the heating chamber 12. The suction port 17 is disposed in the center of the back wall 32 and faces the suction port of the centrifugal fan 22. The suction port 17 is formed to be circular by a plurality of holes.

  The air outlets 18a to 18c are formed by collecting a plurality of holes having a diameter of about 5 mm. By forming the air outlets 18a to 18c into a punch hole shape that is a collection of a plurality of holes, the electromagnetic wave leakage prevention effect to the outside of the heating chamber 12 when electromagnetic wave heating is used together, and the cleaning inside the heating chamber 12 At the same time, it is possible to obtain the effect of suppressing cuts on the fingertip by the hole.

  The air outlets 18a to 18c include a first air outlet 18a, a second air outlet 18b, and a third air outlet 18c. The 1st blower outlet 18a is distribute | arranged above the upper stage mounting tray 40a, and is formed in strip | belt shape along the upper long side which is the edge of the horizontal direction of the back wall 32. As shown in FIG. The second outlets 18b are respectively arranged in the vicinity of the left and right side walls 31 in the middle of the upper stage mounting tray 40a and the lower stage mounting tray 40b, and are formed in a small circular shape. The 3rd blower outlet 18c is distribute | arranged below the lower stage mounting tray 40b, and is formed in strip | belt shape along the lower long side which is an edge of the horizontal direction of the back wall 32. As shown in FIG.

  The first air outlet 18a is formed in a substantially rectangular shape by a plurality of rows of holes arranged at equal intervals along the long side of the back wall 32. A range formed in the rectangle is defined as a blowout region, and a range in which no hole is formed on the flow direction side from the blowout region is defined as a closed region.

  Here, the flow direction side indicates the rotation direction side of the centrifugal fan 22, and the reverse direction side indicates the reverse rotation direction side of the rotation direction of the centrifugal fan 22 and the reverse rotation direction. Further, for convenience of explanation, in the upper part of the heating chamber 12, the flow direction side is the right half side when the heating chamber 12 is viewed from the front, the reverse direction side is the left half side, and in the lower portion, the flow direction side is the left half side, reverse The direction side is the right half side.

  The 1st blower outlet 18a and the 3rd blower outlet 18c are formed so that an opening area may become narrow toward a reverse direction side. That is, the reverse direction side edge part of the 1st blower outlet 18a is formed in a right triangle shape toward the reverse direction side. A triangular closed region is formed above the hypotenuse that connects the uppermost vertex and the lowermost vertex of the right triangle. In this triangular closed area, no air outlet is formed.

  At the end portion on the reverse direction side of the first air outlet 18a, in the conventional configuration, compressed air that is concentrated on the reverse direction side of the fan casing 21 is blown out by the flow of the spiral hot air. However, the presence of the triangular closed region prevents hot air from being blown out from the portion that is blown out the fastest. Therefore, the hot air from the 1st blower outlet 18a is blown off with the substantially same blowing speed in any of a reverse direction side edge part, a center part, and a flow direction side edge part. Therefore, the reach distance of hot air becomes equal in the heating chamber 12, and uniform hot air can be sent into the heating chamber, so that uneven heating can be suppressed.

  Moreover, the flow direction side edge part of the 1st blower outlet 18a is a part of the flow direction side beyond a bisector with respect to the bisector which bisects the back wall 32 along a flow direction. Located within the range of inclusion. Specifically, it does not exceed the straight line L in the height direction passing through the point on the most flow direction side of the outer circumferential circle formed by the centrifugal fan 22, and is positioned on the flow direction side with respect to the bisector of the back wall 32. Thereby, since the wind is not blown into the heating chamber 12 on the flow direction side and hot air does not concentrate on the flow direction side in the heating chamber 12 more than necessary, heat is generated in the vicinity of the side wall 31 on the flow direction side. There is no accumulation.

  The second air outlet 18b is formed so that a plurality of holes are gathered on both the left and right sides of the air inlet 17 to form a small circular area.

  The 3rd blower outlet 18c is distribute | arranged to the position which rotated the 1st blower outlet 18a 180 degree | times centering on the central axis of the centrifugal fan 22, ie, the center of the back wall 32, and a blower outlet shape is formed similarly. . The reverse direction side edge part of the 3rd blower outlet 18c is formed in a right-angled triangle shape toward the reverse direction side. A triangular closed region is formed below the hypotenuse connecting the lowermost vertex and the uppermost vertex of the right triangle. The flow direction side end of the third outlet 18c does not exceed the straight line L in the height direction passing through the point on the most flow direction side of the outer circumference circle formed by the centrifugal fan 22, and is more than the bisector of the back wall 32. Located on the flow direction side.

  With the above configuration, the hot air blown out by the centrifugal fan 22 flows as indicated by an arrow A in FIG. Even when the mounting trays 40a and 40b are mounted on either the upper stage or the lower stage, they pass through the front and bottom surfaces of the mounting trays 40a and 40b. 3 represents the flow of hot air in the heating chamber 12, and the dotted arrow B represents the flow of hot air in the blower 20.

  The flow of hot air directed into the heating chamber 12 at the first corner D of the fan casing 21 is blocked by the triangular closed region formed on the opposite side. Therefore, the amount of hot air blown out from the portion into the heating chamber 12 is reduced. The hot air that has not been blown out is blown out in the range from the center of the first blower outlet 18a to the end in the flow direction. Therefore, the hot air from the 1st blower outlet 18a is blown off with the substantially same blowing air quantity in any of a reverse direction side edge part, a center part, and a flow direction side edge part.

  Moreover, in the reverse direction side edge part of the 1st blower outlet 18a, the wind which concentrated and compressed to the 1st corner part D of the fan casing 21 with the flow of a spiral hot air is blown off by the conventional structure. However, in this embodiment, hot air is not blown out from the portion blown out fastest by the triangular closed region. That is, the hot air is blown out from the first blower outlet 18a on the opposite side of the portion where the hot air is blown out most quickly. Therefore, the hot air from the 1st blower outlet 18a is blown off with the substantially same blowing speed in any of a reverse direction side edge part, a center part, and a flow direction side edge part. Therefore, the reach distance of the hot air is equal in the heating chamber 12, and uniform hot air can be sent into the heating chamber 12.

  As a result, as shown in FIG. 4, an unnatural high heating portion is generated in an oblique direction from the left front side of the upper stage tray 40a as shown in FIG. 10, which is a conventional example, in the upper stage tray 40a. There is nothing.

  In addition, the position of the end in the flow direction side of the first outlet 18a is the same as that of the bisector that bisects the back wall 32 along the flow direction. It is located in the range including the part. That is, since it becomes the position away from the flow direction side edge part of the back wall 32, as shown in FIG. 11, the air volume of the hot air which goes to the side wall 31 by the side of the flow direction in the heating chamber 12 is suppressed. Therefore, since hot air does not concentrate, an overheating part does not occur on the right side of the upper stage tray 40a as shown in FIG.

  Furthermore, since the hot air blown out from the first air outlet 18a is directed to the flow direction side by the spiral flow by the centrifugal fan 22, there is no shortage of heating in the right side portion of the upper stage tray 40a. Therefore, as shown in FIG. 4, the high heating portion is generated in the central portion of the upper stage tray 40 a, and the optimum heating portion is distributed over the entire area. In addition, the distribution of the heating condition by the flow of the above hot air is the same also about the blowing of the hot air from the 3rd blower outlet 18c in the bottom face side of the lower stage mounting tray 40b.

  Therefore, when cooking is performed in the cooking device having the above-described configuration, hot air is blown out uniformly from the air outlets 18a to 18c, and a uniform distribution of the heating condition as shown in FIG. 4 is obtained. Further, as can be seen from FIG. 4, when the contents S on the mounting plates 40a and 40b are, for example, planar cake dough spread over the entire mounting portion of the mounting plates 40a and 40b, Uneven heating is suppressed, and the high heating portion is uniform in the horizontal width direction at the center of the mounting plates 40a and 40b, so that the unnatural appearance of the baked color due to heating is alleviated and suitable cooking is possible.

  By the way, the distribution of the heating condition on the surface of the upper mounting tray 40a differs depending on the position of the end of the first air outlet 18a in the flow direction. Then, the distribution of the heating condition of the surface of the upper stage mounting plate 40a when the position of the flow direction side end portion of the first air outlet 18a is changed will be described based on FIG. 5 and FIG. FIG. 5 is a detailed view of the air outlet, and FIG. 6 is a distribution diagram of the heating condition on the surface of the upper tray when the air outlet end on the wind flow direction side is changed.

  Note that E1 in FIG. 5 is a straight line in the height direction passing through the rotation axis of the centrifugal fan 22, that is, a bisector that bisects the back wall 32, and E5 is located in the vicinity of the side wall 31 on the flow direction side. . Let E2, E3, and E4 be the lines of the equal dividing lines obtained by dividing E1 and E5 into four equal parts.

  When the position of the end in the flow direction of the first outlet 18a is E4 and E5, as shown in FIGS. 6 (d) and 6 (e), the flow proceeds toward the side wall 31 on the flow direction in the heating chamber 12. The amount of hot air increases, and an overheated portion is generated at the end of the upper stage tray 40 in the flow direction. Moreover, when the position of the flow direction side edge part of the 1st blower outlet 18a is E1, as shown to Fig.6 (a), the position of the flow direction side edge part of the 1st blower outlet 18a is E4 and E5 On the contrary, the amount of hot air toward the flow direction side end of the upper stage tray 40a is reduced, and an insufficiently heated portion is generated in front of the right side of the upper stage tray 40a.

  When the position of the flow direction side end portion of the first outlet 18a is located at E2 and E3, as shown in FIGS. 6B and 6C, there is no overheated portion or underheated portion, and the entire This shows a uniform distribution of heating conditions. Here, in the case where the position of the end in the flow direction of the first outlet 18a is E2, the higher heating portion is in the upper stage than in the case where the position of the end in the direction of flow in the first outlet 18a is E3. It is not close to the right side of the mounting tray 40a. Therefore, the appearance of the baked color etc. of the contents S is more preferable when the position of the end in the flow direction side of the first outlet 18a is E2.

  From the above, the flow direction side end of the first outlet 18a does not exceed the straight line L in the height direction passing through the point on the most flow direction side of the outer circumferential circle formed by the centrifugal fan 22, and bisects the back wall 32. More preferably, it is on the flow direction side of the line.

  Moreover, the reverse direction side edge part of the 1st blower outlet 18a is formed in a right triangle shape toward the reverse direction side. By setting the inclination of the hypotenuse connecting the top vertex and the bottom vertex of the right triangle as follows, suitable heating can be performed in the heating chamber 12. At this time, as shown in FIG. 5, the length in the height direction of the heating chamber 12 is T, the length in the width direction is W, and the length-to-width dimension ratio is P = T / W. Further, the length t in the height direction and the length in the width direction of the hypotenuse of the right triangle are represented by w, and the slope of the hypotenuse is represented by p = t / w.

  Here, the aspect ratio (P = T / W) of the heating chamber and the slope of the hypotenuse (p = t / w) are respectively independent parameters, and the aspect ratio P of the heating chamber is 1.0, 0.7, 0. .5, When the aspect ratio p of the hypotenuse is 1.0, 0.7, 0.5, the distribution of the heating condition of the upper heating dish 40a in each parameter will be described with reference to FIG. FIG. 7 shows the heating condition on the surface of the upper tray when the aspect ratio (P = T / W) of the heating chamber and the inclination (p = t / w) of the reverse side end shape of the outlet are changed. A distribution map is shown.

  In the case of P ≦ 0.7, as compared with the other cases, the high heating portion shows a preferable distribution of the heating condition without being overemphasized on the left front side of the upper stage mounting plate 40a. This is because the concentration of hot air at the first corner D and the third corner F of the fan casing 21 is less than the concentration of hot air at the second corner E and the fourth corner G.

  The fan casing 21 has a height direction shorter than that in the lateral width direction by setting P ≦ 0.7. Therefore, the amount of hot air blown from the centrifugal fan 21 against the short side of the fan casing 21 is smaller than the amount of air blown against the long side. Therefore, the hot air concentrated on the first corner D and the third corner F on the opposite side of the short side is the wind concentrated on the second corner E and the fourth corner G on the opposite side of the long side. Less than Thereby, the blowing of the hot air from the reverse direction side of a blower outlet decreases. Therefore, the hot air that was not blown out flows to the flow direction side and is blown out from the flow direction side of the outlet. It becomes a suitable distribution of the heating condition in which the high heating portion is not overemphasized on the left front side of the upper stage mounting tray 40a.

  As can be seen from FIG. 7, when P ≧ p, the right end portion of the high heating portion is not too close to the back wall 32 side of the upper stage tray 40 a and is concentrated in the center. This is because the triangular closed region at the opposite end of the first air outlet 18a reduces hot air blowing concentrated in the first corner D of the fan casing 21 due to the flow of the spiral wind. Therefore, the hot air that was not blown out flows to the flow direction side and is blown out from the flow direction side of the outlet. As a result, there is no difference in the amount of air blown from the opposite direction side and downstream side of the blower outlet, and the high heating part on the wind flow direction side is not too close to the back wall side.

  In addition, the distribution of the heating condition by the flow of the above hot air is the same also about the blowing of the hot air from the 3rd blower outlet 18c in the bottom face side of the lower stage mounting tray 40b.

  As mentioned above, although the application example of this invention was demonstrated based on drawing, this invention is not limited to the said embodiment, A correction and a change can be added within the scope of the present invention. For example, various models such as an axial fan and a turbo fan may be used instead of the centrifugal fan.

  Moreover, you may provide the air blower comprised from a fan casing, a heater, and a centrifugal fan in a heating chamber. In this case, since the blower is arranged in the heating chamber, the wall surface of the fan casing is a part of the wall surface of the heating chamber. Thereby, a blower outlet is formed in the wall surface of a heating chamber, ie, the wall surface of a fan casing.

  Moreover, a blower outlet is not restricted to a punch hole shape. Moreover, you may provide a blower outlet in a side wall instead of providing a blower outlet in a back wall. In this case, the position of the outlet differs according to the direction of the wind.

  Furthermore, the position of the centrifugal fan is not limited to the center of the back wall. The hot air from the centrifugal fan may be guided to the outlet using an air passage such as a pipe or tube.

Front view of a cooking device according to an embodiment of the present invention Side view of cooking device Front view showing the direction of air flow in the cooking device Distribution chart of the heating condition on the upper plate surface Detailed view of the outlet Distribution diagram of the heating condition of the surface of the upper tray at each position when the air outlet end on the wind flow direction side is changed Distribution diagram of the heating condition on the surface of the upper tray when the aspect ratio (P = T / W) of the heating chamber and the inclination (p = t / w) of the shape of the reverse side end of the outlet are changed. Front view of a conventional cooking device Diagram showing direction of wind flow by centrifugal fan Distribution chart of the heating condition on the surface of the upper plate on the conventional cooking device The figure which shows the flow direction of the wind of the conventional heating cooker

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Box 12 Heater 13 Heater 15 Heat insulation door 16 Operation part 17 Inlet 18a 1st outlet 18b 2nd outlet 18c 3rd outlet 19 Support part 20 Blower 21 Fan casing 22 Centrifugal fan 23 Drive motor 31 Side wall 32 Back wall 33 Top wall 34 Bottom wall 40a Upper plate 40b Lower plate A Flow of air in the heating chamber B Flow of air in the fan casing C Flow of air by the centrifugal fan of a conventional cooking device D Fan casing The upper left corner E when the fan casing is viewed from the front The upper right corner F when the fan casing is viewed from the front The lower right corner G when the fan casing is viewed from the front The lower left corner H when the fan casing is viewed from the front Flow I Wind flow in a conventional cooking device funkersig S

Claims (3)

A heating chamber that houses a plurality of mounting dishes in the vertical direction, and a blower that has a centrifugal fan that forms a flow of air in the circumferential direction,
The centrifugal fan is located opposite the center of the rectangular back wall of the heating chamber,
A first air outlet, a second air outlet, and a third air outlet that blow the wind from the centrifugal fan into the heating chamber are formed in the back wall;
The first air outlet is disposed along the upper end side of the back wall,
The second air outlet is disposed in the vicinity of the left and right side walls in the middle between the upper and lower trays,
The third outlet is disposed along the lower end side of the back wall,
In order to prevent heat from accumulating on the wall surface on the side from which the wind blown out from the first air outlet and the third air outlet is directed ,
It said first air outlet and the third outlet comprises a closing region provided with no outlet located on the side where the wind is directed from said centrifugal fan is provided with a outlet on the opposite side of the side where the air is directed Each formed with a blowout area ,
The end of the blowing region on the side where the wind is directed is located on the side toward which the wind is directed rather than the horizontal bisector of the back wall and does not exceed the vertical tangent of the outer circumference circle formed by the centrifugal fan. ,
Heat cooking, characterized in that another end of the blower area opposite to the wind-facing side is formed with another triangular closed area where the end is formed obliquely and no air outlet is provided. vessel. The cooking area according to claim 1, wherein the blowout areas of the first blowout opening and the third blowout opening are respectively formed at a position higher than the upper stage placing dish and at a position lower than the lower stage placing dish. vessel. In a heating chamber formed with a height of T and a width of W, when the aspect ratio of the heating chamber is P = T / W, P is 0.7 or less,
The height of the triangular closed region is t, the width is w,
The cooking device according to claim 1 , wherein when the inclination is p = t / w, P ≧ p.

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