JP2015121333A - High-frequency heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the amount of dew condensation attaching on a wall surface in a heat chamber after heating, and eliminate preheating.SOLUTION: A high-frequency heating cooker includes a heat chamber 12 for accommodating a heat object, and a magnetron (high frequency generation means) 14 which supplies high frequency to the heat chamber. A heat resistance paint 27 is applied to at least one wall surface in the heat chamber. The heat resistance paint includes a high-frequency heat generator which absorbs high frequency and generates heat.

Description

  The present invention relates to a high-frequency cooking device that can suppress the amount of condensation that adheres to the wall surface in a heating chamber.

  In the conventional high-frequency heating cooker, the dew condensation in the heating chamber is reduced by rotating the fan for a predetermined time just before the end of heating cooking and circulating the steam from the food during cooking in the heating chamber. Further, the heating chamber has a heater on at least one of the ceiling, the side wall, and the floor, and the heater is operated before cooking to perform preliminary heating in the heating chamber (see, for example, Patent Document 1). .

Japanese Patent No. 3923025 (Claims 1 and 2)

  In the heating cooker described in Patent Document 1, there is still much dew residue because only steam is circulated by blowing into the heating chamber.

  In addition, when preheating is performed to operate the heater before heating, there is a problem that cooking time by high frequency heating or heater heating becomes long.

  The present invention has been made in order to solve the above-described problems, and is a high-frequency cooking device that can suppress the amount of condensation that has adhered to the wall surface in the heating chamber after heating and can reduce the preheating time. The purpose is to provide.

  The high-frequency heating cooker according to the present invention has a heating chamber for storing an object to be heated and high-frequency generating means for supplying a high frequency to the heating chamber, and at least one wall surface of the heating chamber is subjected to heat-resistant coating. In the container, the heat-resistant paint contains a high-frequency heating element that generates heat by absorbing high-frequency waves.

  According to the high frequency heating cooker of the present invention, the high frequency heating includes a heating chamber for storing the object to be heated and high frequency generating means for supplying high frequency to the heating chamber, and at least one wall surface of the heating chamber is heat-resistant coated. In a cooker, the heat-resistant paint contains a high-frequency heating element that absorbs high frequencies and generates heat, so not only the object to be heated but also the high-frequency heating element contained in the heat-resistant paint is heated during high-frequency heating. This makes it possible to warm the wall with heat-resistant coating. For this reason, the amount of dew condensation adhering to the wall surface in the heating chamber after heating can be suppressed, and the preheating time for operating the heater can be further reduced.

It is a perspective view which shows the external appearance of the high frequency heating cooker which concerns on Embodiment 1 of this invention. It is sectional drawing of the front view which shows the internal structure of the high frequency heating cooker which concerns on Embodiment 1 of this invention. It is sectional drawing which expands and shows the principal part of FIG. It is a graph which shows the relationship between the temperature transition with respect to time of the heat-resistant coating wall surface at the time of the heating chamber drying mode of the high frequency heating cooker which concerns on Embodiment 1 of this invention, and high frequency heating operation. It is a graph which shows the relationship between the temperature transition with respect to the time of the heat-resistant coating wall surface at the time of the heating chamber drying mode of the high frequency heating cooking appliance concerning Embodiment 2 of this invention, and high frequency heating operation. It is a graph which shows the relationship between the temperature transition with respect to time of the heat-resistant coating wall surface at the time of normal use of the high frequency heating cooking appliance which concerns on Embodiment 3 of this invention, and high frequency heating operation | movement. It is a graph which shows the relationship between the temperature transition with respect to time of the heat-resistant coating wall surface at the time of no load of the high frequency heating cooking appliance concerning Embodiment 3 of this invention, and high frequency heating operation.

Embodiment 1. FIG.
FIG. 1 is a perspective view showing an appearance of a high-frequency heating cooker according to Embodiment 1 of the present invention.
In the high-frequency heating cooker according to Embodiment 1 of the present invention, the front surface of the main body 1 is covered with a vertical opening door 3 having a handle 2 as shown in FIG. An operation unit 5 and a display unit 6 connected to the control means 4 having a timer are disposed on the right side of the vertical opening door 3. The operation unit 5 is provided with various operation keys such as a start key 7, a cancel key 8, and a mode selection key 9.

FIG. 2 is a front sectional view showing the internal structure of the high-frequency cooking device according to Embodiment 1 of the present invention. FIG. 3 is an enlarged cross-sectional view showing a main part of FIG.
As shown in FIGS. 2 and 3, the inside of the main body 1 is defined by a heating chamber 12 and an electric chamber 13. In the heating chamber 12, an opening for taking in and out the object to be heated is formed in a front plate (not shown) which is the front surface of the heating chamber 12. It is designed to be opened and closed. The heating chamber 12 is provided with rails 23 and 24 for supporting a heated object placing tray (not shown) on the left and right side walls. A heat resistant coating 27 is applied to the top surface 28 of the heating chamber 12. In addition, an infrared sensor 17 that is a temperature detecting means for detecting the temperature of the top surface 28 to which the heat resistant coating 27 is applied is installed on one (left side) side wall of the heating chamber 12.

  The heat-resistant coating 27 contains a high-frequency heating element that absorbs high frequencies and generates heat. The paint is composed of components mainly composed of, for example, silicon resin. As the high-frequency heating element, magnetic material particles are used. For example, it is composed of Mg, Cu, Zn or the like that generates heat by absorbing a high frequency of 2.45 GHz used in a microwave oven or the like.

  In the electrical chamber 13, a magnetron 14 that is a high-frequency generating means and a high-voltage power generating means 15 that supplies driving power to the magnetron 14 are arranged. As a means for heating the heating chamber 12, a high-frequency heating means using a high frequency and a radiant heating means using a heater are provided.

  In the high frequency heating, a high frequency is excited by a magnetron 14 installed in the electric chamber 13, propagates through a waveguide 18, and is heated via a rotating antenna 20 driven by an antenna motor 19 disposed below the heating chamber 12. 12 refers to a heating system that radiates into the interior and heats an object to be heated by high frequency. In addition, the high frequency exit which irradiates a high frequency in the heating chamber 12 is arrange | positioned in the bottom face of the heating chamber 12, and is covered with the partition plate 26 comprised with the raw material (for example, ceramic) which permeate | transmits a high frequency.

  Radiant heating refers to a heating method in which the inside of the heating chamber 12 is heated to a high temperature by a heater installed at the upper or lower portion of the heating chamber 12 and the object to be heated is heated. Here, as shown in FIG. 2, an upper heater (flat heater) 21 and a lower heater (seeds heater) 22 are arranged, and a heat insulating material 25 is installed above the upper heater 21.

  The control means 4 controls the operation of the magnetron 14 based on the detection result of the infrared sensor 17, operates the magnetron 14, and heats the high-frequency heating element contained in the paint of the heat resistant coating 27 in the heating chamber 12, A heating chamber drying mode for removing moisture adhering to the top surface 28 of the heating chamber 12 to which the heat resistant coating 27 is applied is provided.

FIG. 4 is a graph showing the relationship between the temperature transition with respect to time of the heat-resistant coating wall surface and the high-frequency heating operation in the heating chamber drying mode of the high-frequency heating cooker according to Embodiment 1 of the present invention.
By the way, as the moisture (dew) adhering to the top surface 28 to which the heat resistant coating 27 is applied disappears, the rate of increase in the temperature of the top surface 28 increases. In particular, when the wall surface is dried and moisture is evaporated away, the rate of temperature increase is further increased.

  Therefore, in the heating chamber drying mode, the control means 4 detects the temperature of the top surface 28 to which the heat resistant coating 27 is applied from the start of the high frequency heating as shown in FIG. When the rate exceeds the threshold (point A in the figure), it is determined that the moisture adhering to the heating chamber 12 has been removed, and the high frequency heating is terminated.

  As described above, the high-frequency heating cooker according to the first embodiment of the present invention applies the heat-resistant coating 27 to the top surface 28 of the heating chamber 12, and the heat-resistant coating 27 absorbs the high frequency in the paint and generates heat. A heating element is contained. Therefore, not only the object to be heated during high-frequency heating, but also the high-frequency heating element contained in the paint of the heat-resistant coating 27 can be heated, whereby the top surface 28 subjected to the heat-resistant coating is heated and adhered to the top surface 28. The evaporated water can be evaporated. For this reason, the amount of condensation that adheres to the wall surface in the heating chamber after heating can be suppressed.

In addition, the high-frequency heating cooker according to Embodiment 1 of the present invention operates the magnetron 14 to generate heat from the high-frequency heating element included in the heat-resistant coating 27 of the heating chamber 12, so that the heat-resistant coating 27 of the heating chamber 12 is applied. A heating chamber drying mode for removing water adhering to the top surface 28 is provided. In this heating chamber drying mode, when the temperature of the top surface 28 to which the heat-resistant coating 27 is applied is detected from the start of high-frequency heating, and the rate of increase in the temperature of the top surface 28 exceeds a threshold (point A in the figure) ), It is determined that the water adhering to the heating chamber 12 has been removed, and the high-frequency heating is terminated.
This makes it possible to reduce useless high-frequency heating operations when performing the heating chamber drying mode.

  In addition, after performing high-frequency heating of the food, the top surface of the heating chamber is heated during high-frequency heating during relay heating of “high-frequency heating → radiant heating” in which radiant heating is continuously performed by the heater of the food. Therefore, the preheating by the heater can be shortened, and the cooking time for radiant heating can be shortened.

Embodiment 2. FIG.
FIG. 5: is a graph which shows the relationship between the temperature transition with respect to time of the heat-resistant coating wall surface at the time of the heating chamber drying mode of the high frequency heating cooking appliance concerning Embodiment 2 of this invention, and high frequency heating operation. In the description, reference will be made to FIGS.
In the heating chamber drying mode, when the moisture (dew) adhering to the top surface 28 to which the heat-resistant coating 27 containing the high-frequency heating element that absorbs the high frequency and generates heat is removed, the top surface 28 is removed. The temperature T1 can be collected and set in advance.

  Therefore, the control means 4 detects the temperature of the top surface 28 to which the heat-resistant coating 27 is applied as shown in FIG. 5 in the heating chamber drying mode, and the temperature of the top surface 28 is set to T1 set in advance. When this happens, it is determined that the moisture adhering to the heating chamber 12 has been removed, and the high-frequency heating is terminated. Other configurations are the same as those of the first embodiment.

  Also in the high-frequency heating cooker according to Embodiment 2 of the present invention, the same operations and effects as those of Embodiment 1 described above can be obtained.

Embodiment 3. FIG.
FIG. 6 shows the relationship between the temperature transition with respect to time of the heat-resistant coating wall surface during normal use and the high-frequency heating operation in which the cooked food of the high-frequency heating cooker according to Embodiment 3 of the present invention is placed in the heating chamber 12 for cooking. It is a graph which shows. FIG. 7: is a graph which shows the relationship between the temperature transition with respect to the time of the heat-resistant coating wall surface at the time of no load of the high frequency heating cooking appliance concerning Embodiment 3 of this invention, and high frequency heating operation. “No load” means a state in which a cooked food or the like is not placed in the heating chamber 12. That is, there is no cooked food that becomes a heating load during the heating operation in the heating chamber 12. In the description, the above-described FIGS. 1 to 3 are referred to here.
The time t1 (FIG. 7) for the temperature of the top surface 28, to which the heat-resistant coating 27 containing the high-frequency heating element that generates heat by absorbing high-frequency to the paint to reach the preset specified temperature T2 at no load, is Can be collected in advance. Then, a time longer than the time t1 by a predetermined time is set in advance as the reference time t, and the reference time t is compared with the time for the temperature of the top surface 28 to reach the specified temperature T2. Can be determined.

  Therefore, here, the control means 4 detects the temperature of the top surface 28 to which the heat-resistant coating 27 is applied after the start of the high-frequency heating cooking, and the time for reaching the preset specified temperature T2 is shorter than the reference time t. (In the case of time t1 in FIG. 7), it is determined that there is no load, and high-frequency heating is stopped.

  Further, when the time for reaching the predetermined temperature T2 set in advance is longer than the reference time t (in the case of time t2 in FIG. 6), the control means 4 has a load (heated object) in the heating chamber 12. Judgment is made and high frequency heating is continued. Other hardware configurations are the same as those of the first embodiment.

  In the high-frequency heating cooker according to Embodiment 3 of the present invention, high-frequency heating with no load can be detected, so that a safe heating cooker can be provided without applying a load to the magnetron 14. .

  In each of the above-described embodiments, the heat-resistant coating 27 containing a high-frequency heating element that absorbs high-frequency and generates heat is applied to the top surface 28 of the heating chamber 12 where moisture easily adheres during cooking. However, it goes without saying that the same heat resistant coating 27 may be applied to other wall surfaces.

  As described above, in Embodiments 1 to 3, the temperature of the wall surface of the heating chamber is detected, and the heating operation is stopped based on the detection result. However, the heating operation may be stopped after a predetermined time has elapsed since the start of heating. . Here, the predetermined time is obtained experimentally and theoretically in advance for the time for which the wall surface is sufficiently dried by the heating operation by high frequency.

  DESCRIPTION OF SYMBOLS 1 Main body, 2 Handle, 3 Vertical opening door, 4 Control means, 5 Operation part, 6 Display part, 7 Start key, 8 Cancel key, 9 Mode selection key, 12 Heating room, 13 Electric room, 14 Magnetron (High frequency generation means ), 15 High-voltage power generation means, 17 Infrared sensor (temperature detection means), 18 Waveguide, 19 Antenna motor, 20 Rotating antenna, 21 Upper heater, 22 Lower heater, 23, 24 Rail, 25 Thermal insulation, 26 Partition plate 27 Heat resistant coating, 28 Top surface, T1 temperature, T2 specified temperature, t reference time, t1, t2 hours.

Claims (5)

In a high frequency heating cooker having a heating chamber for storing an object to be heated, and a high frequency generating means for supplying high frequency to the heating chamber, and at least one wall surface of the heating chamber is heat-resistant coated,
A high-frequency heating cooker characterized in that the heat-resistant paint contains a high-frequency heating element that generates heat by absorbing high-frequency waves.   The high-frequency cooking device according to claim 1, wherein the heat-resistant coating is applied to the top surface of the heating chamber. Temperature detecting means for detecting the temperature of the wall surface to which the heat-resistant coating is applied;
Control means for controlling the operation of the high-frequency generation means based on the detection result of the temperature detection means,
A heating chamber that operates the high-frequency heating means to generate heat from the high-frequency heating element included in the paint of the heat-resistant coating in the heating chamber and removes moisture adhering to the wall surface of the heating chamber to which the heat-resistant coating is applied. It has a drying mode,
In the heating chamber drying mode, the control means detects the temperature of the wall surface to which the heat-resistant coating is applied from the start of high-frequency heating, and terminates the high-frequency heating when the rate of temperature increase of the wall surface exceeds a threshold value. The high-frequency heating cooker according to claim 1 or 2, characterized in that. Temperature detecting means for detecting the temperature of the wall surface to which the heat-resistant coating is applied;
Control means for controlling the operation of the high-frequency generation means based on the detection result of the temperature detection means,
A heating chamber that operates the high-frequency heating means to generate heat from the high-frequency heating element included in the paint of the heat-resistant coating in the heating chamber and removes moisture adhering to the wall surface of the heating chamber to which the heat-resistant coating is applied. It has a drying mode,
The control means detects the temperature of the wall surface to which the heat-resistant coating is applied from the start of high-frequency heating in the heating chamber drying mode, and terminates the high-frequency heating when the temperature of the wall surface reaches a preset temperature. The high-frequency heating cooker according to claim 1 or 2, characterized in that. Temperature detecting means for detecting the temperature of the wall surface to which the heat-resistant coating is applied;
Control means for controlling the operation of the high-frequency generation means based on the detection result of the temperature detection means and the time to reach a preset specified temperature,
The control means detects the temperature of the wall surface to which the heat-resistant coating is applied after the start of high-frequency heating cooking, and performs high-frequency heating cooking when the time to reach a preset specified temperature is shorter than a preset reference time. The high frequency heating cooker according to claim 1 or 2, wherein the high frequency heating cooking is continued when the time to stop and reach the specified temperature is longer than the reference time.

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