JP2009092333A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker capable of carrying out even and safe heating in a short time while having a simple configuration. <P>SOLUTION: The heating cooker is provided with a heating chamber 2, a high frequency generating means 27 for supplying a microwave into the heating chamber, and a hot air supplying means 10 for supplying hot air into the heating chamber. It is composed to circulate hot air in the heating chamber from a front upper part of the heating chamber toward a rear lower part by providing the heating chamber 2 with a hot air jetting opening 50 in its upper wall front part, and providing a hot air suction opening 7 in a heating chamber rear wall. A heat reception object is heated by thickly broadening high temperature hot air from a top part of the heat reception object toward a rear side, and the heat reception object is evenly heated throughout a whole area in a short time. Since the hot air is jetted toward the rear side of the heating chamber, even if a door 4 is opened during cooking, the hot air is jetted out with its jetting force weakened, and safety is improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooking device that blows hot air onto an object to be heated to heat the object to be heated in a short time.

  2. Description of the Related Art In general, a cooking device that heats an object to be heated in a short time by heating the object to be heated with high-speed hot air together with a microwave is known (Patent Document 1).

This heating cooker spouts hot air generated by the hot air supply means 101 as a high-speed flow from a jet port 103 provided at the upper and lower portions of the heating chamber 102, and heats the high-speed flow of hot air directly on the object to be cooked. It is like that. In order to heat the food to be cooked uniformly, the hot air passage 104 is tapered to make the jet pressure uniform, and at the same time, the food to be cooked is placed on the turntable 105 and rotated.
JP-A-7-108234

  However, the heating cooker described in Patent Document 1 has a problem that it cannot be heated uniformly unless a turntable is used. Although this is because the hot air jet port is provided as a non-target, it further occurs because this hot air is jetted from the jet port at high speed to directly heat the object to be cooked. That is, since the hot air jetted from the jet outlet is high-speed, heat is applied to the object to be cooked in a spot, and as a result, heating unevenness such as unevenness is generated. This occurs even when the hot air passage is tapered in order to make the jetting force of the hot air jetted from each jet port uniform. Therefore, the thing of this patent document 1 is going to reduce a heating nonuniformity by rotating a to-be-cooked object using a turntable. Therefore, the configuration is complicated, and the configuration is complicated by providing the turntable.

  This invention is made | formed in view of such a conventional subject, and provides the heating cooker which can be heated uniformly and safely in a short time, without using a turntable.

  In order to solve the above-described problems, the present invention has a configuration in which a hot air outlet is provided in the upper portion of the upper wall of the heating chamber and a hot air inlet is provided in the rear wall of the heating chamber.

  As a result, hot air blows from the front upper part to the rear lower part of the heating chamber, and the hot hot air spreads densely from the upper surface of the object to be heated toward the rear side to heat the object to be heated. The entire area can be heated almost uniformly, and the hot air blows out toward the back of the heating chamber, so even if the door is opened during cooking, the hot air blows out. High safety.

  In the cooking device of the present invention, the hot air blown from the front upper part to the rear lower part of the heating chamber wraps and heats the article to be heated with high density, so that uniform heating can be performed in a short time and the door is opened. Safety can be improved.

The present invention includes a heating chamber, high-frequency generating means for supplying microwaves to the heating chamber, and hot air supply means for supplying hot air to the heating chamber, and the heating chamber has a hot air jet at the front portion of the upper wall. And a hot air suction port is provided in the rear wall of the heating chamber to circulate the hot air in the heating chamber from the front upper part to the rear lower part of the heating chamber, and the hot hot air faces the upper surface of the object to be heated to the rear side. It spreads densely and heats the object to be heated, and the entire area of the object to be heated can be heated almost uniformly in a short time, and the hot air is blown out toward the back of the heating chamber Even if the door is opened during cooking, the hot air blowing force is weak and the safety is high.

  The present invention also includes a heating chamber, high-frequency generating means for supplying microwaves to the heating chamber, and hot air supply means for supplying hot air to the heating chamber, the heating chamber having an upper wall front portion and a rear portion. Hot air outlets are provided on both sides of the lower wall and a hot air inlet is provided between the hot air outlets on the rear wall of the heating chamber to circulate hot air in the heating chamber. Both sides of the lower part of the rear wall of the rear wall of the heating chamber show that the hot air blown toward the lower part wraps the object to be heated densely and heats the upper surface of the object to be heated and then heats the upper surface of the object to be heated. Since the hot air ejected from the air is compensated, more uniform heating can be performed in a shorter time and the safety at the time of opening the door can be improved.

  Furthermore, the present invention is the heating cooker according to each of the above inventions, wherein a radiant heater is provided at the bottom of the heating chamber, a breathable heated object mounting member is provided above the radiant heater, and the heated object By positioning the hot air inlet at the lower part of the mounting member, the hot air from the hot air outlet is configured to be sucked into the hot air inlet through the heated object mounting member and the radiant heater, and the lower surface of the heated object Can be efficiently heated in a short time.

  Further, the present invention provides the cooking device according to any one of the first to third aspects, wherein hot air supply means is provided outside the rear wall of the heating chamber, and the hot air from the hot air supply means is supplied to the front portion of the upper wall of the heating chamber. A duct for guiding the hot air outlet to the outside of the upper wall of the heating chamber is provided near one side of the upper wall of the heating chamber, and a waveguide for guiding microwaves from the high frequency generating means into the heating chamber is provided at a substantially central portion of the upper wall of the heating chamber. The microwave is emitted from the upper wall of the heating chamber. The microwave can be efficiently emitted toward the object to be heated in the heating chamber, and the object to be heated can be heated in a shorter time.

  Furthermore, the present invention is the heating cooker according to the invention 4, wherein a duct heater is provided in the duct, and the hot air circulating through the hot air supply means and the heating chamber is heated to a high temperature by the duct heater and the radiant heater. The temperature can be increased and heating can be performed in a shorter time.

  In the cooking device according to any one of the first to fifth aspects of the present invention, the upper upper wall of the heating chamber is formed in a downward slope toward the rear, and a hot air outlet is provided in the downward slope portion. The hot air is blown at an angle to the object to be cooked, and the hot air that hits the upper surface of the object to be heated is less dispersed to thicken the hot air layer and heat the object to be heated in a short time. Can do.

  Furthermore, the present invention provides the cooking device according to any one of the first to sixth aspects, wherein the heating chamber is formed in a substantially rectangular shape having a large width with respect to the vertical width and the hot air supply means is in a lateral direction of the heating chamber. It is possible to circulate a large amount of hot air at a high speed by arranging at least two blowers for circulating hot air, and it is possible to supply a large amount of hot air even in a cooking device with a small vertical dimension. The object to be heated can be heated in a short time.

Further, the present invention provides the cooking device according to any one of the first to seventh aspects of the present invention, wherein the heating chamber and the hot air supply means have an airtight structure, and the hot air circulating between the heating chamber and the hot air supply means is circulated without being released to the outside. Since the low temperature outside air is not mixed into the circulating hot air, the hot air temperature can be maintained high, and the object to be heated can be heated in a shorter time.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 to 6, reference numeral 1 denotes a main body of the cooking device, 2 a heating chamber provided in the main body, which has a substantially rectangular shape with a large width relative to the vertical width, and the front opening 3 is formed at the lower part of the main body. It can be opened and closed by a pivotally supported door 4. The heating chamber 2 is provided with a first hot air outlet 5 formed of a large number of holes in the front portion of the upper wall in a strip shape over the entire lateral width, and a second hot air outlet 6 formed of a large number of holes at the left and right lower portions of the rear wall. Is provided. Further, a hot air suction port 7 made up of a number of holes is provided in a substantially central portion of the back wall between the second hot air outlets 6 of the heating chamber 2. The total opening area of the second hot air outlet 6 is set to be approximately 1/10 or less of the first hot air outlet 5. Further, as is apparent from FIG. 3, the upper wall of the front portion of the heating chamber provided with the first hot air outlet 5 is formed in a downward gradient toward the rear, so that the hot air from the first hot air outlet 5 is cooked. It is configured to be sprayed obliquely toward the object 8. Further, the first hot air outlet 5 has a hole diameter on the front side (opening 3 side) of, for example, 7 mm and a depth of 10 mm on the back side so that the amount of ejection from the hole portion on the back side is larger than that on the front side. It is. Incidentally, the hole diameter of the second hot air jet 6 provided on both sides of the lower part of the heating chamber is, for example, 7 mm.

  Reference numeral 10 denotes hot air supply means provided on the rear wall of the heating chamber 2, which sucks the air in the heating chamber 2 from the hot air inlet 7 and circulates it into the heating chamber 2 from the first and second hot air outlets 5 and 6. And a heater 12 for heating air from the blower 11. As is apparent from FIG. 6, the blower 11 is provided independently in the lateral direction of the heating chamber 2 and is attached to the blower case 13 so that the fan case 12 of the two blowers 11 is covered with the blower case 13. It has become. A duct 15 is attached to an appropriate position on the upper surface of the blower case 13 via a merging duct 14 (see FIG. 3) for merging air from a blower opening (not shown) of each of the blower cases 13. The end opening 15 a is communicated with the first hot air outlet 5 provided over the entire width of the front portion of the upper wall of the heating chamber via the second duct 16. The merging duct 14 is provided with a diversion hole 16 for diverting about one-tenth or less of the air from the blower 11 to a blower guide (not shown) formed on both sides inside the blower case 13. Although not shown, the guide communicates with the second hot air outlet 6 below the heating chamber. Further, the guide tube 7 a of the hot air inlet 7 at the lower part of the heating chamber is opened in the blower case 13, and the air from the blower 11 is supplied to the first through the junction duct 14, the duct 15, and the second duct 16. It is ejected from the hot air outlet 5 into the heating chamber 2, and is ejected into the second hot air outlet 6 skein heating chamber 2 through the diverting hole 16 of the merging duct 14 and the air blowing guide, and the air in the heating chamber 2 sucks in hot air A circulating flow sucked into the blower 11 through the port 7 and the guide cylinder 7a is formed.

  The heater 12 is provided in the duct 15 and is incorporated through a heater opening 15b (see FIG. 6) provided on one side of the duct 15. As shown in FIG. 4, the heater 12 is unitized by incorporating a substantially U-shaped duct heater 18 into a heater holding frame 17 via an insulator 17a, and the heater mounting plate 19 is screwed to the side of the duct 15. And fixed. In the figure, 19a is a sheathed heater insertion hole, and 20 is a motor of the blower 11.

Reference numeral 21 denotes a member to be heated provided in the heating chamber 2, which is provided on one side of the heating chamber so as to be freely drawn out to one of support members 22 such as ceramics provided in two upper and lower stages. The heated object placing member 21 is for placing the heated object 8 and is located above the position of the hot air inlet 7 as shown in FIG. The hot air which heated the to-be-heated material 8 is comprised so that it may flow to the said hot air inlet 7 (it can pass). Reference numeral 24 denotes a radiant heater provided at the bottom of the heating chamber so as to be positioned below the heated object placing member 21. The heated object 8 radiates and heats the heated object 8 and is heated after being heated to be sucked into the hot air inlet 7. The hot air is reheated. In the figure, reference numeral 25 denotes a plurality of raised ribs provided in the front-rear direction of the bottom of the heating chamber, which improves the strength of the bottom of the heating chamber, and does not obstruct the hot air blown forward from the second hot air outlet 6. It is as.

  Reference numeral 27 denotes a magnetron serving as a high frequency generating means for supplying microwaves to the heating chamber 2, and two magnetrons are provided in the machine chamber 28 on the side of the heating chamber 2. In addition to the magnetron 27, the machine room 27 is provided with a high-voltage transformer 29, a cooling fan (not shown) for cooling these components, a control unit (not shown) for controlling the components, and the like. An operation unit (not shown) for instructing operation on / off, various cooking, and displaying the state is provided on the front side of the main body 1 facing the front of the machine room. Reference numeral 30 denotes a waveguide for guiding the microwaves radiated from the antennas 31 of the magnetrons 27 to the heating chambers. Two waveguides corresponding to the magnetrons 27 are received at the center of the upper wall of the heating chamber 2. is there. Reference numeral 32 denotes a rotating antenna that radiates microwaves from the waveguide 30 into the heating chamber 2, and is provided at a substantially central portion of one common microwave radiation chamber 33 communicated with each waveguide 30. The rotation driving motor (not shown) is provided in the motor cooling duct 34. Reference numeral 35 denotes a ceiling plate provided in the lower opening of the common microwave radiation chamber 33, which is formed of ceramic or the like that can transmit microwaves.

  Reference numeral 36 denotes a cooling fan provided on the fan shaft of the blower 11 for circulating hot air, which cools the space between the main body 1, the heating chamber 2 and the blower case 13 and the machine chamber 28. The cooling fan 36 sucks outside air from an air inlet 37 provided on the back surface of the main body 1 and cools the main body 1 by flowing the outside air between the main body 1 and the heating chamber 2 and the blower case 13 and the machine chamber 28. The cooled hot air is exhausted to the outside from an exhaust port 38 provided at one upper corner of the back surface of the main body.

  Next, the operation of the heating cooker with the above configuration will be described.

  When the user sets, for example, frozen pizza and turns on the operation switch, the control unit starts energizing each magnetron 27, the hot air supply means 10, the radiant heater 24, etc., and controls them according to a predetermined sequence.

  First, each magnetron 27 starts oscillating and radiates microwaves. The microwaves are guided by the waveguide 30 to reach the microwave radiation chamber 33, and the microwaves are heated in the heating chamber 2 by the rotation of the rotating antenna 32. Radiated almost uniformly over the entire area, heating the object to be heated 8 from the inside. At the same time, the blower 11 of the hot air supply means 10 starts rotating, the duct heater 18 of the heater 12 generates heat, and the radiant heater 24 at the bottom of the heating chamber 2 also generates heat.

  The hot air supply means 10 ejects air from the blower 11 from the first hot air outlet 5 to the heating chamber 2 through the junction duct 14, the duct 15, and the second duct 16, It ejects from the 2nd hot-air jet outlet 6 to the heating chamber 2 through a guide. At that time, the air flow from the blower 11 is heated to a high temperature by the heater 12 in the duct 15 to become hot air, and heats the upper surface of the object to be heated 8 in the heating chamber 2.

The hot air that has heated the upper surface of the object to be heated 8 passes through the object-to-be-heated mounting member 21 around the object to be heated 8 and heats the lower surface of the object to be heated along the lower surface of the object to be heated 8. Is sucked from the hot air suction port 7 to the blower 11 and circulates between the heating chamber 2 and the hot air supply means 10. At that time, the hot air sucked from the hot air suction port 7 at the lower part of the heating chamber to the blower 11 is reheated by the radiant heater 24 at the bottom of the heating chamber, and becomes a hot circulating hot air. Further, a part of the hot air from the blower 11 is jetted forward along the both side walls of the heating chamber from the second hot air outlets 6 on both sides of the lower portion of the heating chamber, The lower surface of the article to be heated 8 is heated by joining. On the other hand, the radiant heater 24 heats the lower part of the article 8 to be heated together with hot air by the radiant heat.

  Here, most of the hot air that heats the object to be heated 8 is jetted obliquely toward the object to be heated 8 from the first hot air outlet 5 provided in the front upper portion of the heating chamber 2, and the hot air inlet port. Since 7 is provided in the lower rear part of the heating chamber 2, the hot air from each hole constituting the first hot air outlet 5 extends long from the front to the rear side of the heated object 8 when contacting the heated object 8. It will be. Each hole is provided in a strip shape over the entire width of the heating chamber 2, and the hole diameter of each hole on the rear side is larger than the front side of the heating chamber so that a large amount of hot air is ejected. Therefore, more hot air is supplied to the rear side of the object to be heated 8 over the entire width of the object to be heated 8. As a result, the entire area of the object to be heated 8 is heated almost uniformly, and heating with less unevenness in burnt eyes or the like becomes possible.

  On the other hand, as described above, a large amount of hot air flows to the rear side of the object to be heated 8 and wraps around the lower surface side of the object to be heated 8. In this heating cooker, hot air is jetted forward from the second hot air jets 6 on both sides of the rear lower part of the heating chamber 2 to heat the lower front part of the article 8 to be heated. Moreover, the hot air from the second hot air outlet 6 is higher in temperature than the hot air from the second hot air outlet 5 that heats the upper surface of the article to be heated 8 and causes a slight temperature drop. The front part of the lower surface of the object 8 can be efficiently heated. In addition, it is also heated by radiant heat from a radiant heater located below the article 8 to be heated. Therefore, the entire lower surface of the article to be heated 8 can be heated substantially uniformly.

  The hot air blown out from the first and second hot air outlets 5 and 6 of this cooking device is set to 10 to 12 m / sec, which is slightly weaker than the hot air blowing type hot air flow rate of 16 m / sec described in the conventional example. In addition, a hot air layer having a high density is formed on the upper surface of the object to be heated 8 in combination with the oblique application of the hot air, and the entire area of the object to be heated 8 is heated uniformly. In other words, as in the conventional example, when hot air hits the object to be heated in a perpendicular state, part of the hot air hits the object to be heated and reverses upward, and the lateral spread of the hot air with high temperature becomes thin. When hot air strikes the object to be heated obliquely as in the form of, the upward spots of hot air disappear and all of them spread along the upper surface of the object to be heated. The heated object is encased in the hot air layer having a high density, and almost the entire area of the object to be heated 8 is heated almost uniformly.

  And since the hot air for heating to-be-heated material 8 spouts toward the rear part from the upper wall front part of the heating chamber 2 as mentioned above, even if the door 4 may be opened in the middle of heating, the hot air in the heating chamber is vigorous. Spraying toward the user can be prevented. That is, when the door 4 is opened during cooking, the control unit stops the blower 11, but the blower 11 continues to rotate by inertia force and continues to blow hot air, but the hot air blows toward the back side opposite to the door 4. Therefore, the momentum of the hot air ejected from the heating chamber opening 3 can be greatly reduced as compared with the conventional one. At this time, hot air is blown forward from the second hot air outlet 6 on both sides of the rear lower part of the heating chamber 2, but the amount is as small as about one-tenth of the hot air from the first hot air outlet 5, and the door There is almost no hot air jetted by the force of the inertial force of the blower 11 when 4 is opened, and the jetting moment can be suppressed to be extremely small as compared with the prior art.

In addition, since two blowers 11 that supply hot air are provided in the horizontal direction along the horizontally long shape of the heating chamber 2, the amount of air can be increased as compared with the case of a single blower 11. That is, in the case of a horizontally long heating chamber, the fan diameter of the blower 11 is regulated by the narrow vertical dimension of the heating chamber. Therefore, the fan diameter of the blower 11 must be selected to be relatively small, and the air volume is inevitably small. In this embodiment, the heating chamber 2 is set to a horizontally long size and heated. Since the two blowers 11 having left and right fan diameters about the vertical dimension of the chamber are provided, the air volume can be increased accordingly. Accordingly, the slow flow rate of hot air can be compensated for by increasing the amount of hot air, and the amount of heat applied to the object to be heated 8 can be made equal to or higher than that of the conventional one, enabling heating in a shorter time. Become. Of course, in this case, the amount of heat for heating the wind from the blower 11 is the same as that of the conventional one. In this embodiment, the radiation heater 24 at the bottom of the heating chamber is composed of two 1500 W sheathed heaters. The duct heater 18 is one U-shaped sheathed heater of 2900W.

  Furthermore, the circulation path such as the heating chamber 2 and the hot air supply means 10 and the duct 15 connecting them with each other has an airtight structure so that only the air in the heating chamber 2 and the hot air supply means 10 circulates. It is possible to circulate hot air at a higher temperature than that in which the hot air is circulated while taking a part of the hot air and discharging it to the outside.

  On the other hand, the microwaves from each magnetron 27 are guided to the two waveguides 30 and collected in one microwave radiation chamber 33, and are heated from the rotary antenna 32 having a size that almost covers the ceiling of the heating chamber 2. Therefore, the object to be heated 8 can be microwave-heated strongly and almost uniformly. In this embodiment, the rotating antenna 32 is configured as one, but the rotating antenna 32 may be two rotating antennas having different diameters, or the rotation may be stopped or rotated toward an arbitrary place as an antenna having strong radio wave directivity. Thus, it is possible to heat more uniformly.

  Due to the synergistic effect of the operation as described above, the object to be heated 8 can be cooked in a very short time in this cooking device. For example, heating six pieces of bread is about 75 seconds, and one hamburger-type one that is cut and opened with bread and cheese is heated in about 40 seconds, which is much shorter than the conventional household microwave oven. As time cooking became possible, the heating of the six breads had almost uniform scorching.

  As described above, the heating cooker according to the present invention can perform uniform heating in a short time because the hot air blown from the front upper part to the rear lower part of the heating chamber wraps and heats the object to be heated with high density. At the same time, the safety at the time of opening the door can be improved, and it can be applied to a wide range of heating devices as a cooking cooker for business as well as a cooking cooker for home use.

External appearance perspective view of the heating cooking machine in Embodiment 1 of this invention External perspective view when the door is opened Sectional view when the door is opened Cross section viewed from the front External perspective view when the body of the main body is removed The exploded perspective view of the principal part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Heating chamber 4 Door 5 1st hot-air ejection port 6 2nd hot-air ejection port 7 Hot-air inlet 10 Hot-air supply means 12 Heater 15 Duct 24 Radiation heater 27 Magnetron (high frequency generation means)
30 Waveguide

Claims (8)

A heating chamber, high-frequency generating means for supplying microwaves to the heating chamber, and hot air supply means for supplying hot air to the heating chamber. The heating chamber is provided with a hot-air jet outlet at the front of the upper wall and heated. A cooking device configured to provide a hot air suction port on the rear wall of the chamber to circulate the hot air in the heating chamber from the front upper part to the rear lower part of the heating chamber. A heating chamber, high-frequency generating means for supplying microwaves to the heating chamber, and hot air supply means for supplying hot air to the heating chamber, the heating chamber having both an upper portion of the upper wall and lower portions of the rear wall. A hot cooker configured to circulate the hot air in the heating chamber by providing a hot air outlet and providing a hot air suction port between the hot air outlets on both sides of the rear wall of the heating chamber. By providing a radiant heater at the bottom of the heating chamber, providing a breathable heated object placing member above the radiant heater, and positioning a hot air inlet at the lower part of the heated object placing member The cooking device according to claim 1 or 2, wherein the hot air from the hot air outlet is configured to be sucked into the hot air inlet through the object-to-be-heated object mounting member and the radiant heater. Hot air supply means is provided outside the rear wall of the heating chamber, and a duct for guiding the hot air from the hot air supply means to the hot air outlet at the front of the upper wall of the heating chamber is provided near one side outside the upper wall of the heating chamber. A waveguide that guides the microwave from the high-frequency generating means into the heating chamber is provided at a substantially central portion of the upper wall of the heating chamber to radiate the microwave from the upper wall of the heating chamber. The heating cooker according to item 1. The cooking device according to claim 4, wherein a duct heater is provided in the duct, and the hot air circulating through the hot air supply means and the heating chamber is heated to a high temperature by the duct heater and the radiant heater. The front upper wall of the heating chamber is formed in a downward slope toward the rear, and a hot air outlet is provided in the downward slope portion so that the hot air is blown obliquely to the object to be cooked. The heating cooker according to item 1. The heating chamber is formed in a substantially rectangular shape with a large width relative to the vertical width, and the hot air supply means can circulate a large amount of hot air at high speed by arranging at least two hot air circulation fans in the horizontal direction of the heating chamber. The cooking device according to any one of claims 1 to 6. The heating cooker according to any one of claims 1 to 7, wherein the heating chamber and the hot air supply means are configured to be airtight, and the hot air circulating between the heating chamber and the hot air supply means is circulated without being released to the outside.