JP4740178B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker that efficiently discharges heat generated by a heater to a heating chamber using a hot air circulation type heating method.

  Dividing household cooking appliances by difference in heat source, gas combustion cooker that burns gas and uses the burned heat as a heat source, and heating cooking that heats the heater with electricity and uses the generated heat as a heat source There is a cooker (hereinafter referred to as a heating cooker).

  The difference in the ability of the heating cooker using gas and electricity is that the heating cooker for gas requires about 6 minutes to warm the temperature in the heating chamber to 300 ° C., whereas the heating cooker has a temperature of 250 in the heating chamber. It takes about 15 minutes to warm up to ℃ and the difference is very large. Moreover, since the output of the cooking device using electricity is already used in a state close to the upper limit of 100V, 15A of a household power supply, it is very difficult to bring it closer to the ability of the cooking device for gas. It is.

  Products that use electricity are easier to use than products that use gas, and a clean feeling without burning parts is preferred. In recent years, power has been increased by 200V power supply (increased power consumption). Electrification is progressing.

  Under such circumstances, the heating cooker has a high heating power equivalent to that of the gas cooking cooker due to 200V, and has been required to have the ability to warm the temperature in the heating chamber to 300 ° C. in about 6 minutes.

  Therefore, it is necessary to efficiently and effectively use the heat energy of the heater in order to quickly raise the temperature of the heating chamber, which is a feature of high thermal power.

  As shown in Patent Document 1, in a heating cooker that circulates hot air, a technique for improving the position of an outlet (exhaust hole group) that sends hot air into a heating chamber and eliminating heating unevenness of food to be heated is disclosed. Yes.

  Regarding the positional relationship between the heater (heater) and the centrifugal fan (stirring circulation fan) in the fan casing (heater storage case) that creates hot air in the disclosed technology, the heater (heater) is a centrifugal fan (stirring circulation fan) ) Around the center. By arranging the heater (heater) concentrically with the centrifugal fan (agitating circulation fan), there is an advantage of heating the air sent out by the centrifugal fan (agitating circulation fan) evenly.

  Furthermore, in Patent Document 2, both oven cooking and grill cooking can be performed by adjusting the position of the exhaust (exhaust) of the (exhaust) outlet (exhaust hole group) for blowing hot air into the heating chamber. The technology is public.

JP 2006-71125 A Japanese Utility Model Publication No. 1-169701

  A heater that is a heat source in order to realize the ability to heat the heating room temperature to 300 ° C in about 6 minutes in the same manner as a gas heating cooker. Increasing the power consumption caused the following problems.

  Using inexpensive heaters used in household products to achieve high thermal power equivalent to that of gas cooking devices, increasing power consumption increases power consumption per heater surface area and increases heater surface temperature. As a result, there was a problem of shortening the life of the heater.

  Therefore, if the heater surface area is increased by increasing the heater outer diameter in order to reduce the power consumption per unit surface area of the heater, the distance from the heat source in the heater to the heater surface becomes longer and the heater surface temperature rises worse. There was a problem.

In order to solve this problem and make it possible to use an inexpensive heater that has been used conventionally, the power consumption per unit surface area of the heater is 6 to 8 W / cm ² and the heater surface temperature is 800 ° C. or less. In addition, it is necessary not to increase the outer diameter of the heater so that the rise of the heater surface temperature does not deteriorate.

In view of this, some heaters are used in such a manner that the power consumption per unit surface area of the heater can be 6 to 8 W / cm ² without increasing the outer diameter of the heater.

  In addition, there is one in which the heater surface area is increased by increasing the length of one heater so that heat generated by the heater can be efficiently transmitted to the air and the temperature rise in the heating chamber can be accelerated.

  However, there is a problem that a heater having a long overall length must be stored in a limited space.

  The heating cooker of patent document 1 is a centrifugal fan (stirring circulation) about the positional relationship of the heater (heater) and centrifugal fan (stirring circulation fan) in the fan casing (heater storage case) which produces hot air. Since the fan is concentrically arranged around the center, it is possible to arrange only a circular heater that fits between the upper and lower outlets (exhaust holes).

  It is possible to make a circle that fits the height of the heating chamber (heating chamber) at the maximum, but in that case, the heater (heater) cannot stay on the windward side of the outlet (exhaust hole group), and partly Since the position of the air outlet (exhaust hole group) comes to the inlet side (intake hole group) on the windward side of the heater, the air sucked from the intake port (intake hole group) does not pass through the heater (heating chamber) ) (Exhaust), the heat generated by the heater cannot be efficiently transmitted to the air.

  Also, without changing the outer diameter of the circular shape of the heater (heater), increase the number of heaters to increase the number of heaters or use a single long heater wound in a coil. The depth dimension of the cooker increases.

  Similarly, in the microwave oven (heating cooker) of Patent Document 2, the position of the air outlet (exhaust hole group) is on the side of the air inlet (intake hole group) on the windward side of the heater. The sucked air is blown out (exhausted) into the heating chamber without passing through the heater.

  An object of the present invention is to provide a heating cooker that can increase the length of a heater disposed in a heater storage case and efficiently exhaust heat generated from the heater to a heating chamber.

The present invention has been made to solve the above problems, a heating chamber for placing food which is an object to be heated, an intake for circulating air in the heating chamber to the rear surface portion of the heating chamber comprising a face side wall portion after providing the the hole group and the exhaust hole group, the agitating circulation fan for circulating the heating chamber of the air, is formed in the provided substantially square around the stirring circulation fan to the outside of the rear side wall portion In the heating cooker having a heater storage case in which a concave portion meandering to the stirring circulation fan side is formed and a heater for heating the circulating air is arranged, the heater storage case has the size of the four corners of the heater storage case. forming a large arc than the depth of the storage case, when the rotation of the stirring circulation fan counterclockwise, before Symbol suction hole group provided on the rear surface side wall portion, the stirring circulation fan of matches to the heater housing case Provided to fit into the fan-diameter, the exhaust hole group includes a first exhaust hole groups which asked the right located in upper portion of the heater housing case, located in lower portion of the front Symbol heater housing case A second exhaust hole group arranged on the left side, and third and fourth exhaust hole groups located on the left and right of the intake hole group, and the total number of holes of the exhaust hole group is the number of the intake hole groups More heaters are provided, and the positions of the heaters are the same as the holes on the windward side of each of the exhaust hole groups or are located on the windward side.

  According to the present invention, a heater with a long heater length and a large surface area can be accommodated in a heater storage case in a limited space, and the heater position is an exhaust provided at a plurality of locations. By providing the same position as the hole position on the windward side of the hole group or on the windward side, the heat generated by the heater can be efficiently transferred to the air in the wind path.

  And a heating cooker can also achieve the high thermal power equivalent to the heating cooker for gas.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 1 shows a front view in which a heating cooker and an induction heating cooker are incorporated in a system kitchen, FIG. 2 shows a front view in which the door of the heating cooker is opened, and FIG. 3 shows cooking in FIG. (X-Y part) sectional drawing of a container is shown (however, the door is in the closed state).

  On the front surface of the cooking device 1, a door 4 and a kangaroo pocket type operation display panel 6 (shown in a state in which the operation unit and the display unit are stored) are arranged. A handle 3 is attached to the door 4. By pulling the handle 3 toward the front, the door 4 can be opened horizontally by a hinge mechanism (not shown) having a lower portion of the door 4 as a fulcrum.

  The door 4 is provided with a transparent glass window 5 so that the heating chamber 25 can be seen through the glass window 5.

  The side wall 12 of the heating chamber 25 is provided with a shelf on which a square dish is placed. The shelves have three levels: a guide part upper stage 13, a guide part middle stage 14, and a guide part lower stage 15. In the figure, a square plate 23 is placed on the middle guide section 14 and a square plate 24 is placed on the lower guide section 15. The square dish 23 and the square dish 24 have the same size, and are used to place food when cooking food (not shown).

  Which shelf is loaded with a square dish depends on the type of cooking and the menu. For example, there are grill cooking and oven cooking that can be divided by cooking type. Grill cooking uses the upper part 13 of the guide part mainly on a menu for cooking using the upper heater 27 described later. In the oven cooking, cooking is performed with hot air exhausted from a plurality of exhaust hole groups which will be described later, and the shelf position to be used uses the guide section middle stage 14 and the guide section lower stage 15, and the shelf to be used depends on the cooking menu. The position may use either the middle guide section 14 or the lower guide section 15 depending on the amount of food to be cooked.

  A plurality of holes are formed in the rear side wall portion 16 of the heating chamber 25, and a group of holes that are positioned substantially in the center of the rear side wall portion 16 sucks air in the heating chamber 25 into a heater storage case 17 described later. A.

Next, a group of holes for heating the air sucked into the heater storage case 17 with the heater 20 described later and exhausting it to the heating chamber 25 will be described. The exhaust hole group includes a first exhaust hole group B provided between the upper side of the heater storage case 17 and the square plate 23, and a second exhaust hole provided between the lower side and the square plate 24. A third exhaust hole group D and a fourth exhaust hole group E provided between the square plate 23 and the square plate 24 are arranged on the left and right sides of the group C and the intake hole group A.

  In the present embodiment, the second exhaust hole group C disposed on the lower side of the heater storage case 17 is divided into the exhaust hole group C1 and the exhaust hole group C2, but the exhaust hole group C1 and the exhaust hole are provided. An exhaust hole may be provided between the group C2 to form one exhaust hole group, or may be subdivided into a plurality of exhaust hole groups. Similarly, the first exhaust hole group B disposed on the upper side of the heater storage case 17 may be subdivided into two or more exhaust hole groups.

  A plurality of weight sensors 11 for measuring the weight of food to be cooked are attached to the bottom surface portion 10 of the heating chamber 25, and a tray 26 on which food is placed is placed on each weight sensor 11. The weight sensor 11 measures the weight of the food to be cooked, and the cooking time can be calculated from a weight value of the food obtained from the measurement using a control program incorporated in advance. The tray 26 is used for cooking using a high frequency (not shown), and the main cooking is used for warming food or thawing frozen food.

  On the back side of the upper surface of the heating chamber 25, a planar upper heater 27 that heats the entire upper surface is installed, and the ceiling portion of the heating chamber 25 generates heat by heat conduction. It is used at the same time as the heater 20 to be described later in order to shorten the preheating time mainly during preheating for grill cooking and oven cooking.

  The rear side wall portion 16 of the heating chamber 25 is provided with the above-described intake / exhaust hole group, and the outer side of the rear side wall portion 16 is covered with a heater storage case 17.

  In the heater storage case 17, the air in the heating chamber 25 is sucked from the intake hole group A provided in the rear side wall part 16, and the sucked air is first to fourth exhaust hole group B provided in the rear side wall part 16. , C, D, and E to circulate the air in the heating, and the air sucked from the intake hole group A from the first to fourth exhaust hole groups B, C, D, and E A heater 20 is provided for heating the sucked air before exhausting.

  In this embodiment, the heater 20 is composed of two stages, a front stage heater 20a and a rear stage heater 20b.

  Further, the outside of the rear side wall portion 16 in the heating chamber 25 is covered with the heater storage case 17, and the air sucked from the intake hole group A provided in the rear side wall portion 16 is provided in the rear side wall portion 16. The air passage 33 that guides air to the exhaust hole groups B, C, D, and E of the air is formed, and the air sucked from the intake hole group A passes through the stirring circulation fan 18 and the heater 20 and is provided at a plurality of locations. The first to fourth exhaust hole groups B, C, D, and E are reached.

  The stirring circulation fan 18 is driven by a drive motor 19 directly connected thereto. Here, a corner coil induction motor is used for the drive motor 19.

  4 shows an internal perspective view of the heater storage case, FIG. 5 shows the positions of the intake / exhaust holes in the rear side wall and the positions of the components of the heater storage case, and FIG. The same shape as the rear heater).

  The stirring circulation fan 18 is a centrifugal fan and includes eight fan blades 40, and the extension lines of the fan blades 40 are arranged so as to be shifted from the axis 41. This is because the agitation capacity on the outer peripheral side of the agitation circulation fan 18 is increased, although the ability of the fan blades 40 to suck in is lower than when the shaft 41 is in contact with the extended line of the fan blades 40.

  The rotation direction of the agitation circulation fan 18 of this embodiment is counterclockwise when viewed from the front of the main body.

  The heater 20 has a total of four locations, two on the upper side and two on the lower side of the heater housing case 17, so that two heaters, the front heater 20a and the rear heater 20b, are overlapped with the screws 30 using the heater pressing brackets 22. It is fixed.

  The heater 20 is divided into two parts, a pre-stage heater 20a and a post-stage heater 20b, to reduce the power consumption per unit surface area of the heater and ensure the life of the heater. In addition, the heater surface area is increased by increasing the total length of each heater, and heat generated can be efficiently transferred to the air.

  Further, the heater 20 is formed in a substantially square shape as shown in FIG. 6, and one side of the heater 20 is formed in the shape of the concave portion 34 meandering inside the substantially rectangular shape, and the first to fourth exhaust hole groups B and C are formed. , D, and E, the heater 20 can be stored in the heater storage case 17 in a narrow space by being located on the windward side or the same as the hole position on the windward side, and the heat generated by the heater 20 can be efficiently generated. The heating chamber 25 can be evacuated.

  In addition, it is possible to easily change the design accompanying an increase in heater output, and to reduce the number of changed parts.

  Furthermore, the heater 20 itself uses the same shape heater so that the heater 20 can be efficiently produced at low cost, and either one can be placed upside down. I was able to. In addition, since the terminal positions can be in the same direction, the connection efficiency can be improved. The heater 20 used here is preferably a sheathed heater in which a heating coil is inserted into a metal pipe.

  In this embodiment, the heater 20 uses two heaters in two stages, but the number of heaters is not limited.

  The power supply connection terminals of the heater 20 are 31a and 31b of the pre-stage heater 20a and 32a and 32b of the post-stage heater 20b. Screws are provided so that a power supply terminal (not shown) from the power supply can be connected to each power connection terminal with screws. Is cut off. The tightening direction of the screws is determined by fixing the direction of the power connection terminals 31a, 31b, 32a, 32b of each heater 20 so that the tightening operation can be performed from the rear surface to the front surface side of the heating cooker 1.

  An air conditioning plate 28 and an air conditioning plate 29 that change the direction of the wind are provided so that hot air can be exhausted into the heating chamber 25 from the third exhaust hole group D and the fourth exhaust hole group E.

  Next, the positional relationship between the first to fourth exhaust hole groups B, C, D, E of the rear side wall portion 16 and the heater 20 provided in the heater storage case 17 and the agitation circulation fan 18 will be described.

Most of the holes in the intake hole group A are located between the two square plates 23 and 24 when the square plate 23 and the square plate 24 are placed on the middle guide portion 14 and the lower guide portion 15 of the heating chamber 25. The rear side wall 16 is located at the center in the longitudinal direction. Then, the size and position of the agitation circulation fan 18 and the number of holes of the intake hole group A are determined so that all the holes of the intake hole group A are within the fan diameter of the agitation circulation fan 18.

  Next, the exhaust holes for discharging hot air are provided with the first exhaust hole group B on the upper side of the square plate 23 placed on the middle guide section 14 and the second on the lower side of the square dish 24 placed on the lower guide section 15. Exhaust hole group C is provided, and the third exhaust hole group D and the fourth exhaust hole group are provided at the left and right ends of the intake hole group A between the two square plates 23 and 24 as in the intake hole group A. E is provided.

  In the hot air circulation path in the heating chamber 25, the hot air discharged from the first exhaust hole group B passes through the upper part of the square plate 23 placed on the guide part middle stage 14, hits the closed door 4, and the guide part middle stage. 14 and the square plate 23 and the square plate 24 placed on the lower guide portion 15 are sucked into the intake hole group A. The hot air discharged from the second exhaust hole group C passes under the square plate 24, hits the door 4, passes between the square plate 23 and the square plate 24, and is sucked into the intake hole group A.

  When the hot air exhausted from the first exhaust hole group B and the second exhaust hole group C hits the door 4 and passes back between the square plate 23 and the square plate 24, the hot air is heated to the food to be cooked. The temperature of the hot air is reduced, and the suction width of the intake hole group A is particularly narrow. The hot air is sucked into the intake hole group A, and the width of the hot air is reduced as it approaches the intake hole group A. The temperature on the part 12 side is lowered. A third exhaust hole group D and a fourth exhaust hole group E for discharging hot air are provided in a region where the temperature is low, and new hot air is discharged to eliminate temperature unevenness of the hot air.

  When square plates are used in a single stage, for example, when cooking is performed in a single stage in which the square plate 23 is placed only on the middle 14 side of the guide portion, the hot air exhausted from the second exhaust hole group C is converted into the second exhaust hole group C. Since there is no partition between the intake hole group A, the intake hole group A is sucked at an early stage. However, cooking without heating unevenness can be performed even by one stage of a square dish by controlling cooking time, energization rate to the heater 20, and the like.

  The same applies when the square plate 24 is placed only on the lower side 15 of the guide section.

  The holes of the intake / exhaust hole group have the same size, and in the present embodiment, φ5 (mm).

  Next, the positional relationship among the heater 20, the intake hole group A, and the first to fourth exhaust hole groups B, C, D, and E will be described.

  The positional relationship between the first to fourth exhaust hole groups B, C, D, E provided at a plurality of locations and the heater 20 is such that the heater position is blown from the stirring circulation fan 18 with respect to the exhaust hole groups provided at a plurality of locations. The heater 20 is installed so that the wind to be blown is located at the same position as the hole position on the windward side of the exhaust hole group provided at a plurality of locations or on the windward side.

  The heater 20 installed on the windward side of the first and second exhaust hole groups B, C is disposed along the longitudinal direction of the exhaust hole groups B, C, D, and the heat generated by the heater 20 is more efficiently used. It is well communicated to the air.

  In addition, the hole positions of the third and fourth exhaust hole groups D and E are difficult to determine in advance, and the final hole positions are adjusted and determined while checking with actual cooking. Therefore, the shape of the heater 20 is arranged slightly apart from the exhaust hole group, and after the final exhaust hole position is determined, even when one heater is turned over, the exhaust hole group is always avoided, and the windward side of the exhaust hole group It is determined so as to be located at the same position as the hole position at the top or on the windward side.

  Further, the upper and lower heater lengths are determined to be substantially the same so that the heat generation amount of the heater 20 is the same on the upper and lower sides and the left and right, and the left and right heater lengths are also determined to be approximately the same.

  Therefore, the air sucked from the intake hole group A by the stirring circulation fan 18 is efficiently heated by the heater 20 and can be efficiently discharged from the first to fourth exhaust hole groups B, C, D, and E. Yes.

In this embodiment, the number of intake holes and exhaust holes is 163 in the intake hole group A, 155 in the first exhaust hole group B, 56 in the exhaust hole group C1 in the second exhaust hole group C, and exhaust gas. The hole group C2 is 36, the third exhaust hole group D is 18, and the fourth exhaust hole group E is 24.

  The total number of holes in the first to fourth exhaust hole groups B, C, D and E is about 1.7 times the number of holes in the intake hole group A and more than the number of holes in the intake hole group A. This is because when the air sucked from the intake hole is discharged by the centrifugal force of the stirring circulation fan 18, the heater 20 is provided in the air path from the stirring circulation fan 18 to the first to fourth discharge hole groups B, C, D, E. This is because the resistance in the air passage is increased by the heater holding metal fittings 22 and the like. Accordingly, the area of the exhaust hole is increased to balance the exhaust flow rate and the suction flow rate, whereby the agitation circulation is performed smoothly and the heating unevenness of the food cooked in the heating chamber 25 is improved.

  The heater storage case 17 has a rectangular shape, and a stirring circulation fan 18 using a centrifugal fan is disposed at the center. The wind blown by the rotation (counterclockwise) of the stirring circulation fan 18 and the wind hitting the long side of the heater storage case 17 are added, and the corner G of the heater storage case 17 is on the opposite side in both pressure and temperature. It becomes higher than the corner H.

  Further, turbulent flow is likely to occur at the corner G where the pressure has increased, and the efficiency of discharging hot air into the heating chamber 25 also decreases. However, by forming the four corners (each G, H) with a large arc, the air path resistance at the corners can be reduced, and the stirring and discharging efficiency can be improved.

  Here, the minimum dimension of the arc is larger than the depth dimension of the heater storage case 17.

  In addition, since the temperature of the hot air rises in the part where the pressure rises, the number of exhaust holes in the part where the pressure rises is reduced or the exhaust air hole is not provided in the part where the pressure is high. The heating unevenness of the food cooked in the heating chamber 25 is improved.

Further, in the exhaust hole groups E and D , the number of holes in the exhaust hole group D part is small. The exhaust hole group E part side has a heater terminal part, and the terminal side 30 to 50 mm has no heat generating part. Since the temperature is reduced and the temperature difference is lower, the number of holes on the third exhaust hole group D side (the higher temperature side) is reduced to reduce the difference between the left and right exhaust temperature, and the position of the fourth exhaust hole group E To improve the temperature distribution.

  According to the present invention, a heater having a heater with a long life and a large surface area is formed in a substantially square shape, and one side thereof is formed in the shape of a recess 34 on the side of the stirring circulation fan inside the substantially square shape. By molding, it can be stored in the heater storage case in a limited space, and the heater position is the same as the hole position on the windward side of the first to fourth exhaust hole groups or provided on the windward side Thus, the heat generated by the heater can be efficiently transferred to the air in the air passage.

  And a heating cooker can also achieve the high thermal power equivalent to the heating cooker for gas.

The front view which integrated the heating-cooker main body into the system kitchen. The front view which opened the door of the heating cooker. Sectional drawing of the XY part of FIG. 2 (state which closed the door). The perspective view of a heater storage case. The figure which shows the position of each component of the hole of a suction / exhaust hole group of a rear side wall part, and a heater storage case. The figure which shows the back | latter stage heater (a front | former stage heater and a back | latter stage heater are the same shapes).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating cooker 2 System kitchen 13 Guide part upper stage 14 Guide part middle stage 15 Guide part lower stage 16 Rear side wall part 17 Heater storage case 18 Stirring circulation fans 23 and 24 Square dish

Claims (1)

A heating chamber for placing food which is an object to be heated, provided with a face side wall portion after providing the intake hole group and the exhaust hole group for circulating the heating chamber of the air surface after said heating chamber, said rear side wall A stirring circulation fan that circulates the air in the heating chamber outside the section, and a concave portion that is formed around the stirring circulation fan and has a substantially rectangular shape meandering toward the stirring circulation fan, and heats the circulating air. In the cooking device provided with a heater storage case in which a heater is disposed, the heater storage case is formed with arcs having four corners larger than the depth dimension of the heater storage case, and the stirring circulation fan rotates. when counterclockwise, the rear sidewall before Symbol suction hole group provided in the unit, provided to fit into the fan diameter of the said agitation circulation fan of matches to the heater housing case, the exhaust hole group, the heater A first exhaust hole groups which asked the right located in upper portion of the paid case, and located in lower portion of the front Symbol heater housing case the second exhaust hole groups that closer to the left side, of the intake hole group A third and a fourth exhaust hole group located on the left and right, and the total number of holes in the exhaust hole group is greater than the number of the intake hole groups, and the heater is positioned on the windward side with respect to each of the exhaust hole groups. A heating cooker characterized by being located at the same position as the hole in or in the windward side.

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