JP2005273933A - High frequency heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high frequency heating cooker capable of preventing burning from occurring even if a hand carelessly touches a see-through window. <P>SOLUTION: This high frequency heating cooker comprises a cooling means 11 to cool the see-through window (glass panes 8d, 8e) of an opening/closing door 8 covering the opening part of a heating chamber. Thus, since the temperature of the see-through window of the opening/closing chamber 8 is suppressed by the action of the cooling means 11, burning does not occur even if the hand carelessly touches the see-through window, and the cooker can be safely used. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high-frequency heating cooking apparatus that includes high-frequency generating means and heating means, and heat-treats an object to be heated.

2. Description of the Related Art Conventionally, a high-frequency heating cooking apparatus equipped with high-frequency generating means for outputting a high frequency in a heating chamber that accommodates an object to be heated can efficiently heat the object to be heated in the heating chamber in a short time. It is rapidly spreading as a microwave oven that is a cooking device. And the thing which added the heating means etc. in order to expand the width | variety of heat cooking is proposed (for example, refer patent document 1).
JP 54-115448 A

  However, in the conventional configuration, when heating by the heating means is performed, the see-through window provided on the open / close door that covers the opening of the heating chamber becomes high temperature, and when the object to be heated in the heating chamber is confirmed from the see-through window, etc. Inadvertently touching the fluoroscope window could cause burns.

  The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a high-frequency heating cooking apparatus that does not cause burns even when the fluoroscopic window is inadvertently touched.

  In order to solve the above-described conventional problems, the high-frequency heating cooking apparatus of the present invention cools the see-through window of the open / close door provided with a cooling means and covering the opening of the heating chamber.

  As a result, the temperature of the see-through window of the open / close door can be kept low, and even if the see-through window is inadvertently touched, it does not cause burns and can be used safely.

  The high-frequency cooking device of the present invention can be used safely without causing burns even when the transparent window of the door is inadvertently touched.

  According to a first aspect of the present invention, there is provided a high-frequency generating means for outputting a high frequency into a heating chamber that accommodates an object to be heated, a heating means for heating the object to be heated in the heating chamber, and a see-through window that covers the opening of the heating chamber. With the high-frequency heating cooking apparatus provided with the open / close door and the cooling means for cooling the see-through window of the open / close door, the see-through window of the open / close door can be kept at a low temperature by the action of the cooling means. Even if the fluoroscope window is touched in advance, it will not cause burns and can be used safely.

  According to a second invention, in particular, in the first invention, the see-through window includes a plurality of glass plates provided via an air layer, and the cooling means sees through the cooling fan and the flow of air generated by the cooling fan. By providing a duct that leads to the air layer of the window, the air layer of the fluoroscopic window is cooled by the introduction of air, the temperature of the fluoroscopic window is effectively kept low, and even if the fluoroscopic window is touched carelessly Can be used safely.

  According to a third aspect, in the first aspect, the see-through window includes a plurality of glass plates provided through an air layer, and the cooling means is configured to provide a cooling fan and a flow of air generated by the cooling fan. By providing a duct leading to the outer surface of the glass plate, the outside of the transparent window is cooled by introducing air without lowering the glass plate temperature on the heating chamber side of the transparent window, and the transparent window is effectively The temperature is kept low, and even if the fluoroscope window is inadvertently touched, it does not cause burns and can be used safely.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, a temperature detection unit that detects an atmospheric temperature in the heating chamber is provided, and the cooling unit is operated by detecting a predetermined temperature in the heating chamber. Accordingly, the temperature of the fluoroscopic window is predicted to keep the temperature of the fluoroscopic window low, and even if the fluoroscopic window is inadvertently touched, no burns are caused, and it can be used safely.

  According to a fifth invention, in any one of the first to third inventions, a temperature detecting means for detecting the temperature of the see-through window is provided, and the cooling means is operated by detecting the predetermined temperature of the see-through window. By directly detecting the temperature of the fluoroscopic window, appropriate operation control of the cooling means according to the temperature of the fluoroscopic window can be performed.

  According to a sixth invention, in any one of the second to fifth inventions, the cooling means uses a cooling fan for cooling the magnetron, so that one cooling fan can be used without increasing the number of parts. The magnetron and the viewing window can be cooled.

  According to a seventh aspect of the present invention, in any one of the fourth to sixth aspects of the invention, since the air volume control means for controlling the air volume of the cooling fan according to the temperature in the heating chamber or the temperature of the see-through window is provided, the temperature is high. If this is the case, the air volume from the cooling fan can be increased, the temperature can be lowered in a short time, and the life of the cooling fan can be extended by suppressing the air volume (rotation speed).

  According to an eighth invention, in any one of the second to seventh inventions, the temperature is quickly lowered to a predetermined temperature by operating the cooling means until the temperature becomes equal to or lower than the predetermined temperature after the end of the cooking operation. It can be recognized that the cooling fan is hot during operation.

  According to a ninth invention, in any one of the fifth to eighth inventions, the temperature display unit that notifies the temperature of the fluoroscopic window is provided, so that the user can easily recognize the temperature of the fluoroscopic window with the temperature display unit. Yes, you can be careful.

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

(Embodiment 1)
1 to 4 show a high-frequency heating cooking apparatus according to Embodiment 1 of the present invention.

  As shown in FIGS. 1-3, in this Embodiment, the high frequency heating cooking apparatus 1 is used as a microwave oven which can be heated by the high frequency heating, hot air, and heat radiation for the cooking of the to-be-heated material A (foodstuff). A high frequency generating means 3 for outputting a high frequency in the heating chamber 2 for accommodating the article A to be heated; heating means 4 and 5 for heating the air in the heating chamber 2; A circulation fan 6 for stirring the atmosphere, an opening / closing door 8 having a see-through window covering the opening of the heating chamber 2, and a cooling means 11 for cooling the see-through window of the opening / closing door 8 are provided. Then, at least one of high-frequency heating, hot air, and thermal radiation is supplied to the heating chamber 2 to heat the object A to be heated in the heating chamber 2.

  The heating chamber 2 is formed inside a box-shaped main body case 7 that is open on the front surface, and an open / close door 8 that covers the opening of the heating chamber 2 is provided on the front surface of the main body case 7. A predetermined heat insulating space is secured between the wall surfaces of the heating chamber 2 and the main body case 7, and a heat insulating material is loaded in the space as necessary. In particular, the space behind the heating chamber 2 is a circulation fan chamber (not shown) that houses the circulation fan 6 that stirs the atmosphere in the heating chamber 2 and its drive motor. However, the partition wall 9 defines the heating chamber 2 and the circulation fan chamber.

  The partition wall 9, which is the rear wall of the heating chamber 2, has an intake vent hole that sucks air from the heating chamber 2 side to the circulation fan chamber side, and an air blower that blows air from the circulation fan chamber side to the heating chamber 2 side. Ventilation holes are provided separately from the formation area. Each ventilation hole is formed as a large number of punch holes 9a.

  Further, on the upper surface and the rear surface of the heating chamber 2, a flat heater formed of a mica-insulated heating element constituting the heating means 4 and a convection heater (seeds heater) constituting the heating means 5 are provided. It has been. At the upper corner of the heating chamber 2, temperature detection means 10, which is a thermistor that detects the ambient temperature in the heating chamber 2 and controls the temperature in the heating chamber 2, has its tip protruding into the heating chamber 2. In addition, an infrared sensor (not shown) is provided above the heating chamber 2 so that the surface temperature of the article A to be heated can be detected from the through hole 9b in the upper center of the partition wall 9. Although the detection signal of the temperature detection means 10 is not shown in the figure, it is monitored by a control circuit to control the operation of the heating means 4 and 5 and the circulation fan 6 (overtemperature prevention control, heat generation control, rotation speed control, etc. Etc.).

  The high frequency generating means 3 is disposed in a space where the magnetron 3a is partitioned by a mounting table 12 formed of ceramic or the like provided on the lower side of the heating chamber 2, and the magnetron provided with the cooling fin portion 3c. A stirrer blade 3b is provided at a position to receive the high frequency generated from 3a. Then, by irradiating the rotating stirrer blade 3b with a high frequency from an antenna (not shown), the stirrer blade 3b supplies the high frequency to the heating chamber 2 while stirring.

  The open / close door 8 has a door radio wave seal having a resistance of zero Ω having a glass plate 8d outside the door attached to the door casing 8b and a plurality of punching holes formed of a metal body attached to the door casing 8b. A portion 8c, a glass plate 8e inside the door provided in the door radio wave seal portion 8c, and a door casing cover 8f are provided. The glass plate 8d and the glass plate 8e are provided via an air layer 8k, and the temperature of the air layer 8k is detected by temperature detecting means 8a made of a thermistor. The door casing 8b is provided with an air inflow portion 8i and an outflow portion 8j that allow ventilation to the air layer 8k. Further, the door casing 8b is provided with an opening / closing door handle 8g and an operation panel 8h having a door operation switch, a start button, and the like. The glass plates 8d and 8e constitute a see-through window of the open / close door 8, and the inside of the heating chamber 2 can be confirmed from the outside. The operation panel 8h is also provided with a temperature display unit 8m, in which the temperature of the see-through window detected by the temperature detecting means 8a is notified by a numerical value or a graph. It can be confirmed from the outside.

  The cooling means 11 includes a cooling fan 11a that generates cooling air, a duct 11b that guides the cooling air generated by the cooling fan 11a to the cooling fin portion 3c of the magnetron 3a, and further this cooling air from the cooling fin portion 3c. The duct 11c leads to the air inflow portion 8i of the open / close door 8 and the air volume control means 11d for controlling the air volume by controlling the rotational speed of the cooling fan 11a. The air volume control means 11d controls the air volume by controlling the rotational speed of the cooling fan 11a in accordance with the temperature detection by the temperature detection means 8a.

  Note that the high frequency generating means 3 and the cooling means 11 are not limited to the bottom of the heating chamber 2, but can be provided on the upper surface or the side surface of the heating chamber 2.

  Next, the operation at the time of heating the article A to be heated using the high frequency generating means 3 will be described.

  First, the user opens the door 8, puts the object A to be heated wrapped in a wrap or a sealed pack into the heating chamber 2, and closes the door 8. At this time, the power is automatically turned on.

  When the operation panel 8h is operated and a start button (not shown) is operated, the magnetron 3a and the stirrer blade 3b are automatically operated to start heating the article A to be heated. At this time, since the temperature of the magnetron 3a becomes high, the cooling fan 11a operates according to the operation time of the magnetron 3a, and the cooling fin portion 3c is cooled by the air passing through the duct 11b. The air used for this cooling passes through the duct 11c and is discharged to the outside through the inflow portion 8i and the outflow portion 8j of the open / close door 8. The high frequency heating operation is terminated by stopping the high frequency heating means 3 when the temperature detected by the infrared sensor provided above the heating chamber 2 reaches the predetermined temperature tn.

  Next, the operation at the time of heating the article A to be heated using the heating means 4 and 5 will be described.

  First, the user opens the door 8, puts an oven dish (not shown) on which the article A to be heated is placed, into a rail portion (not shown) provided on the inner wall surface of the heating chamber 2, and opens and closes the door 8. Close. At this time, the power is automatically turned on.

  When the operation button 8h is operated and a start button (not shown) is operated, the heating means 4 and the flat and convection heaters as the heating means 4 and the circulation fan 6 are automatically controlled by a control circuit (not shown). It starts to operate based on the cooking sequence programmed. Thereafter, as the temperature in the heating chamber 2 rises, the amount of heat due to radiation and convection increases also in the opening / closing door 8 part, not to mention the glass plate 8e constituting the transparent window, but also through the air layer 8k. The plate 8d also starts to heat up.

  At this time, since the temperature of the air layer 8k is detected by the temperature detecting means 8a, as shown in FIG. 4, when the atmospheric temperature of the air layer 8k reaches a predetermined temperature t1, the cooling fan 11a operates and the duct 11b. , 11c, flows into the air layer 8k from the inflow portion 8i, cools the glass plates 8d and 8e, and the door radio wave seal portion 8c, and is discharged to the outside from the outflow portion 8j. Further, the amount of air supplied from the cooling fan 11a is such that if the temperature of the air layer 8k is increased by the air amount control means 11d, the temperature of the air layer 8k is decreased by gradually increasing the fan rotation speed. . The grill and oven heating operation ends when the heating means 4 and 5 and the circulation fan 6 stop when a predetermined time elapses at a predetermined temperature t3 set at the time of use. The operation is performed while the fan rotational speed is decreased step by step until the atmospheric temperature becomes equal to or lower than the predetermined temperature t2.

  Thus, in the present embodiment, the cooling means 11 for cooling the see-through window of the open / close door 8 is provided, so that the temperature of the see-through window of the open / close door 8 can be kept low by the cooling action of the cooling means 11. Thus, even if the fluoroscope window is inadvertently touched, it does not cause burns and can be used safely. Further, the see-through window includes a plurality of glass plates 8d and 8e provided through the air layer 8k. Since the air from the cooling means 11 is introduced into the air layer 8k and cooled, the see-through window is effective. The temperature can be kept low.

  In addition, when the fluoroscopic window reaches the predetermined temperature t1 by the temperature detecting unit 8a, the cooling unit 11 is operated so that the temperature of the fluoroscopic window is directly detected, so that the cooling unit according to the temperature of the fluoroscopic window is detected. 11 proper operation control can be performed. Further, since the magnetron 3a and the heating means 4 and 5 are rarely used at the same time, the cooling temperature depends only on the use environment temperature flowing into the cooling fan 11a. Therefore, the cooling means 11 can use the cooling fan 11a for cooling the magnetron 3a, and the single cooling fan 11a can cool the magnetron 3a and the see-through window without increasing the number of parts. Further, by providing the air volume control means 11d for controlling the air volume of the cooling fan 11a according to the temperature of the see-through window, if the temperature of the see-through window increases, the air volume from the cooling fan 11a is increased, and the temperature is increased in a short time. In addition, the life of the cooling fan 11a can be extended by suppressing the air volume (rotation speed).

  Further, since the cooling means 11 is operated until the predetermined temperature t2 or less after the cooking operation is finished, the temperature can be quickly lowered to the predetermined temperature, and the temperature of the cooling fan 11a is high during the operation. It can be recognized that there is. Further, since the temperature display unit 8m for notifying the temperature of the fluoroscopic window is provided, the user can easily recognize the temperature of the fluoroscopic window with the temperature display unit 8m and can be careful.

(Embodiment 2)
FIG. 5 shows an operation sequence of the high-frequency heating cooking apparatus according to Embodiment 2 of the present invention.

  In the present embodiment, the difference from the first embodiment is that the temperature in the heating chamber 2 is brought to a predetermined temperature t4 by the temperature detection means 10 that detects the atmospheric temperature in the heating chamber 2 and controls the temperature in the heating chamber 2. For example, the cooling means 11 is operated so that the temperature of the door 8 is automatically lowered. Further, when the predetermined temperature t5 is reached, the cooking is finished and the number of rotations of the cooling fan 11a is decreased, and the cooling fan 11a is operated until the atmospheric temperature of the air layer 8k becomes equal to or lower than the predetermined temperature t6. Other configurations are the same as those of the first embodiment.

  Generally, when the high frequency generating means 3 is used, the temperature in the heating chamber 2 does not become high, and when the grill or oven using the heating means 4 and 5 is used, the heating chamber 2 becomes hot. The amount of heat due to radiation and convection also increases with time, and the see-through window tends to become high temperature. From this, by detecting the temperature of the heating chamber 2, the temperatures of the glass plates 8d and 8e and the air layer 8k that constitute the transparent window can be predicted.

  In the present embodiment, the temperature of the opening / closing door 8 part including the see-through window can be lowered by operating the cooling fan 11a by reflecting the detection signal of the temperature detection means 10 to the air volume control means 11d. . Therefore, the temperature detection means 10 can control the cooling of the see-through window and the temperature in the heating chamber 2.

(Embodiment 3)
FIG. 6 shows a main configuration of the high-frequency heating cooking apparatus according to Embodiment 3 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the present embodiment, the difference from the first embodiment is that the see-through window includes a plurality of glass plates 8d and 8e provided via an air layer 8k, and the cooling means 11 includes a cooling fan 11a and a cooling fan. And a duct 11c for guiding the air flow generated in 11a to the surface layer of the glass plate 8d outside the transparent window. That is, an air outflow portion 8l is provided on the lower front surface portion of the glass plate 8d attached to the door casing 8b of the open / close door 8, and the flow of cooling air to the open / close door 8 is not the air layer 8k but the glass layer 8k. It is made to flow only on the surface layer of the plate 8d.

  In the present embodiment, when the cooling fan 11a operates, air flows from the outflow portion 8l to the surface layer of the glass plate 8d via the ducts 11b and 11c, and flows upward while taking heat of the glass plate 8d. Therefore, the temperature of the outer glass plate 8d that can be easily touched by the user is effectively reduced, and even when the user touches the fluoroscopic window carelessly, it can be used safely without causing burns. At this time, since the glass plate 8e is not cooled, the heat in the heating chamber 2 is not taken away and excellent heat treatment can be performed.

  In the present embodiment, the air flow is made to flow only on the surface layer of the glass plate 8d. However, a part of the air flow may be introduced into the air layer 8k. In this case, it is necessary to consider the flow of air and the amount of air so that the glass plate 8e is not excessively cooled and takes away the heat in the heating chamber 2.

  The configuration of each of the above-described first to third embodiments can be appropriately combined as necessary, and is not limited to each embodiment itself.

  As described above, the high-frequency cooking device according to the present invention does not cause burns even when the transparent window of the door is inadvertently touched, and can be used safely. It can adapt to.

External appearance perspective view of the high frequency heating cooking apparatus in Embodiment 1 of this invention The front view which shows the state which opened the opening-and-closing door of the high frequency heating cooking device Sectional drawing which shows schematic structure of the opening / closing door and cooling means of the same high-frequency heating cooking apparatus The figure which shows the operation | movement sequence of the high frequency heating cooking apparatus The figure which shows the operation | movement sequence of the high frequency heating cooking apparatus in Embodiment 2 of this invention. Sectional drawing which shows schematic structure of the opening-and-closing door and cooling means in Embodiment 3 of this invention

Explanation of symbols

A Heated object 2 Heating chamber 3 High frequency generating means 3a Magnetron 4, 5 Heating means 8 Opening / closing door 8a, 10 Temperature detecting means 8d, 8e Glass plate (transparent window)
8k Air layer 8m Temperature display section 11 Cooling means 11a Cooling fans 11b, 11c Duct 11d Air volume control means

Claims (9)

A high-frequency generating means for outputting a high frequency in a heating chamber containing the object to be heated, a heating means for heating the object to be heated in the heating chamber, an open / close door having a see-through window covering the opening of the heating chamber, A high-frequency heating cooking apparatus comprising cooling means for cooling the see-through window of the open / close door. The see-through window includes a plurality of glass plates provided through an air layer, and the cooling means includes a cooling fan and a duct for guiding the air flow generated by the cooling fan to the air layer of the see-through window. The high frequency heating cooking apparatus of description. The see-through window includes a plurality of glass plates provided through an air layer, and the cooling means includes a cooling fan and a duct for guiding the flow of air generated by the cooling fan to the surface of the glass plate outside the see-through window. The high frequency heating cooking apparatus of Claim 1. The high-frequency cooking apparatus according to any one of claims 1 to 3, further comprising a temperature detection unit that detects an atmospheric temperature in the heating chamber, wherein the cooling unit is operated by detecting a predetermined temperature in the heating chamber. The high-frequency cooking apparatus according to any one of claims 1 to 3, further comprising a temperature detection unit that detects a temperature of the see-through window, wherein the cooling unit is operated by detecting a predetermined temperature of the see-through window. The high-frequency cooking apparatus according to any one of claims 2 to 5, wherein the cooling means uses a cooling fan for cooling the magnetron. The high-frequency cooking apparatus according to any one of claims 4 to 6, further comprising an air volume control unit that controls the air volume of the cooling fan in accordance with the temperature in the heating chamber or the temperature of the see-through window. The high-frequency cooking apparatus according to any one of claims 2 to 7, wherein the cooling means is operated until the temperature becomes equal to or lower than a predetermined temperature after the end of the cooking operation. The high frequency heating cooking apparatus of any one of Claims 5-8 provided with the temperature display part which alert | reports the temperature of a fluoroscope window.

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