JP6096720B2 - Electric heater - Google Patents

Description

  The present invention relates to an electric heating apparatus including a plurality of energizing heating means such as a rice cooker, an oven, a fish roaster, a microwave oven, a microwave oven, an iron, and a hot plate.

  The indoor wiring in a general household branches from the distribution board into several circuits and supplies power to the outlets installed in each room. A circuit breaker (branch breaker) protects the safety of this branch circuit. The current that can flow through one branch circuit is 20A, and the rating of the outlet is 100V and 15A is the mainstream. For this reason, various electric appliances for consumer use that receive power supply from the outlet are naturally configured with a rated power of 1500 W or less at 100 V below the rating of the outlet.

  Considering the actual situation on the power supply side, in Patent Document 1, for example, in a heating cooker provided with a heater having a power consumption of 1500 W and a steam generating heater having a power consumption of 900 W as heating means, in the first period, While the heater is turned on / off, the steam generating heater is turned off, and in another second period, the steam generating heater is turned on / off, while the heater is turned off, so that the power consumption of the cooking device becomes the rated power of the outlet. The idea of controlling not to exceed (1500 W) throughout is shown.

JP 2012-241942 A

  As described above, in an electric heating device such as a heating cooker that operates by receiving power supply from an outlet, the rated power is suppressed to 1500 W or less, so an electric heating device with an input voltage of 200 V or more, or a gas device Compared with, the heating amount is low, which is a negative factor in securing heating performance such as cooking with a large heating amount.

  Specifically, in the case of an oven range, for example, four types of heating means are provided: a hot air oven (1400 W), superheated steam (1200 W), a grill (1100 W), and a range input (1400 W). The hot-air oven heater (hot-air heater) used for oven cooking is set with the amount of heat necessary to raise the temperature in the 20L-31L class interior space in a short time from cold, for example, the interior temperature is 250 ° C. After reaching the value, the hot air heater is turned on / off in order to maintain the temperature detection means at 200 ° C. to 230 ° C.

  Although the energization rate at this time depends on the environmental temperature, if it is about 50%, the actual power consumption is 1400 × 50% = 700 W, and there is a surplus of 800 W remaining for the rated power. However, since the power consumption reaches 1400 W when the hot air heater is turned on, another heating means can be turned on at the off timing, but the off period is originally provided to energize another heating means. Since it is not a thing, there was a fault which cannot be used effectively for heating, such as cooking.

  Therefore, in view of the above problems, the present invention provides an electric appliance capable of improving the heating performance by efficiently using a plurality of heating means within the range limited by the rated power of the outlet. The first purpose.

In order to achieve the first object, the invention according to claim 1 is an electric heating apparatus that operates by receiving power supply from an outlet, and is a first heating unit that heats a space in a cooking cabinet as a plurality of heating means. Heater, a second heater that radiates and heats infrared rays into the cooking chamber, and a steamer that supplies steam into the cooking chamber, and the power consumption of the first heater is at most the outlet. The power consumption of each of the second heater and the steamer is at most equal to or less than the rated power of the outlet, and the cooking power is less than or equal to the rated power. When the on-off control of the first heater is performed by reducing the power consumption of the first heater so as to maintain the temperature inside the chamber at the set temperature, the maximum power consumption of the second heater and the steamer From the previous value Variably below the value obtained by subtracting the power consumption of the first heater, or fixed in a state that is set, the second heater or the steamer is characterized by being configured to be energized.

According to the first aspect of the present invention, preheating for rapidly heating the inside of the cooking chamber is performed by adjusting, for example, the first heater among the plurality of heating means to the maximum power consumption substantially equal to the rated power of the outlet. After preheating, the power consumption of the first heater is reduced to half the value, while maintaining the inside of the cooking chamber at a high temperature, the first heater is turned on and off, and the power consumption of another second heater is reduced. Variable or fixed to the value obtained by subtracting the power consumption of the first heater from the rated power of the outlet and energizing the second heater to quickly burn or heat the object to be heated in the cooking chamber. It becomes possible to do. In addition, the steamer can be energized in combination with the steamer instead of the second heater, and steam can be supplied into the cooking chamber while keeping the cooking chamber at a high temperature, so that the object to be heated in the cooking chamber can be baked gently. it can. Therefore, it is possible to improve the heating performance by efficiently using a plurality of heating means within the range limited by the rated power of the outlet, and realize an optimal heating configuration according to the cooking menu. .

It is a front view which shows the external appearance of a microwave oven as an electric heating instrument of 1st Example of this invention. It is a front view which shows the internal structure of the state which removed the door same as the above. It is a block diagram which shows the electrical structure of a microwave oven same as the above. It is a timing chart which shows the operation state of a hot air heater at the time of oven cooking same as the above. It is a timing chart which shows the operation state of a hot air heater and a grill heater, and the graph which shows the internal temperature at the time of combined use of oven cooking and grill cooking. It is a front view which shows another internal structure of the state which removed the door of the microwave oven same as the above. It is a graph which shows the relationship between the temperature inside a cooking chamber, and time. It is the timing chart which shows the graph which shows the temperature change of the square plate in a conventional product and this modification, and the mode of the power interruption of the heating means in this modification. It is a figure which shows schematic structure of a high power cooking device and an electric power system as an electric heating appliance of 2nd Example of this invention.

  Hereinafter, preferred embodiments of the electric heating apparatus of the present invention will be described in detail with reference to the accompanying drawings.

  FIGS. 1-8 has shown 1st Example which applied the electric heating appliance of this invention to the microwave oven. First, the external configuration of the microwave oven will be described with reference to FIG. 1. A reference numeral 1 denotes a main body formed in a rectangular box shape, and a cooking chamber 2 that accommodates an object to be heated and cooks it inside the main body 1. It is formed. The cooking chamber 2 is wide in the left-right direction, and is provided with a door 3 for opening and closing the large front opening. Therefore, the door 3 is provided so as to cover almost the entire front surface of the main body 1, and the lower end portion thereof is pivotally supported so as to be freely rotatable.

  The upper part of the door 3 is provided with a handle 4 for opening and closing which is used when the door 3 is opened and closed, and the lower part of the door 3 is provided with an operation panel unit 5 for display, notification and operation. Yes. The operation panel unit 5 includes a display unit 6 for displaying cooking setting contents, progress status, and the like, as the operation unit 7, a first heating condition setting unit 8 and a second heating condition for setting a heating condition related to cooking. It comprises a setting means 9, a heating start instruction means 10 for instructing the start of heating, and a cancellation instruction means 11 for canceling the setting or stopping cooking. Although not shown, an operation panel PC (printed circuit) board (not shown) is disposed on the rear side of the operation panel unit 5 in order to control the display means 6 and the operation means 7.

  The first heating condition setting means 8 is an electronic touch key, and includes a “mono” key and a “boiled” key for selecting a cooking menu for automatic cooking that does not require setting of cooking time and temperature. In addition, it consists of a “range” key, “oven” key, and “steam” key for selecting manual cooking that requires setting of cooking time, temperature, or output. Configured. The second heating condition setting means 9 detects rotation in order to select a cooking menu other than “mono” or “boiled” in addition to setting the cooking time and temperature in manual cooking. This is a rotatable dial composed of an encoder. The heating start instruction means 10 is a key for starting heating the object to be heated in the cooking chamber 2 after setting the heating conditions by the first heating condition setting means 8 or the second heating condition setting means 9. The means 11 is a key for canceling the heating condition and stopping the cooking. These heating start instruction means 10 and cancellation instruction means 11 are mechanical keys (tactile switches).

  The display means 6 includes, for example, a liquid crystal display means 14 that displays the number of cooking menu, temperature, time, output, and the like, and an LED display means 15 that blinks or lights up according to the progress of cooking. . The main body 1 is provided with a cord 16 with a plug that can be attached to and detached from an indoor wiring outlet (not shown). The plug-attached cord 16 corresponds to a connection means that enables power supply from the indoor wiring to the main body 1 by connecting to an outlet installed at an arbitrary place in the room.

  FIG. 2 is a diagram illustrating the internal structure of the microwave oven. In the figure, reference numeral 17 denotes a square dish for placing an object to be heated in the cooking cabinet 2. The square dish 17 has a rectangular shallow dish shape, is provided so as to be able to be taken in and out from the front opening of the cooking cabinet 2, and is placed on a shelf support (not shown) formed to project from the left and right inner walls of the cooking cabinet 2. In a state where the square plate 17 is placed on the shelf support, an upper space 18A and a lower space 18B are defined as the space 18 in the cooking cabinet 2, respectively.

  Inside the main body 1, a hot air fan unit 21 that generates hot air is provided behind the cooking chamber 2. This hot air fan unit 21 is disposed on the back side of the inner wall surface 22 forming the cooking chamber 2 as a heating unit for heating an object to be heated in the cooking chamber 2, and a hot air heater 23 for heating the air and its heating Main components are a hot air fan 24 for sending the generated air into the cooking chamber 2 and a hot air motor 25 for rotating the hot air fan 24.

  In particular, the hot air heater 23 of the present embodiment is an upper hot air heater 23A disposed facing the upper space 18A in the cooking chamber 2 and a lower hot air heater disposed facing the lower space 18B as heating means for the hot air oven. 23B. For example, a sheathed heater, a mica heater, a quartz tube heater, a halogen heater, or the like is used as the upper hot air heater 23A or the lower hot air heater 23B as these heating elements. The hot air fan 24 is provided as a so-called centrifugal fan that discharges air taken in the axial direction in a radial direction perpendicular to the axial direction by centrifugal force during rotation. A plurality of holes 26 that allow air (hot air) to flow between the hot air fan unit 21 and the space 18 in the cooking cabinet 2 are provided at appropriate positions on the indoor wall surface 22.

  In addition to the hot air fan unit 21, a grill heater 27 is provided here as a heating means for the grill, which heats the object to be heated by emitting infrared rays including far infrared rays from the upper surface of the cooking cabinet 2. The grill heater 27 according to the present embodiment includes two grill heaters 27 </ b> A and 27 </ b> B provided on the upper portion of the main body 1 as a planar heater serving as a heating element. Reference numeral 28 denotes water vapor generating means that enables cooking with superheated steam. The water vapor generating means 28 includes a steam heater 29 comprising two steam generating heaters 29A and 29B as heating means for superheated steam. I have. Steam generating heaters 29 </ b> A and 29 </ b> B serving as these heating elements are provided on the left and right side surfaces of the cooking chamber 2, respectively. Further, the cooking chamber 2 includes a magnetron, an antenna, and the like as a heating means for range input in order to radiate microwave energy to the space 18 in the cooking chamber 2 to heat the object to be heated. A microwave supply means 31 is provided.

  FIG. 3 shows the electrical configuration of the microwave oven described above. Reference numeral 41 denotes a microcomputer corresponding to the heating control means, which includes a CPU as arithmetic processing means, a memory as storage means, an input / output device, and the like. In addition to the above-described operation means 7, first heating condition setting means 8, second heating condition setting means 9, heating start instruction means 10, and cancel instruction means 11, the input port of the microcomputer 41 includes a cooking chamber. The chamber temperature detection means 42 such as a thermistor for detecting the temperature in 2 and the temperature inside the cooking chamber 2 are detected to detect the temperature of the object to be heated stored therein. The distribution detection means 43, the door open / close detection means 44 for detecting the open / closed state of the door 3, and the current detection means 45 for detecting the input current flowing into the main body 1 through the cord 16 with the plug are electrically connected.

  The output port of the microcomputer 41 includes a range driving unit 46 that variably adjusts the output of the microwave radiated from the microwave supply unit 31 as a power adjustment unit that can individually adjust the power of the heating unit. The hot air heater 23A and the lower hot air heater 23B are individually turned on and off, and the hot air heater driving means 47 that variably adjusts the output of the hot air heater 23 and the grill heaters 27A and 27B are individually turned on and off, and the output of the grill heater 27 The grill heater driving means 48 for variably adjusting the steam heater and the steam heater driving means 49 for variably adjusting the output of the steam heater 29 by individually turning on and off the steam generating heaters 29A and 29B are electrically connected. In addition, the output port of the microcomputer 41 is electrically connected to the display means 6 and the motor driving means 50 for generating a drive signal to the hot air motor 25, respectively.

  Then, the microcomputer 41 detects the internal temperature detection means 42, the internal temperature distribution detection means 43, the door open / close detection means 44, the detection signals from the current detection means 45, the first heating condition setting means 8, 2 Upon receiving each operation signal from the heating condition setting means 9, the heating start instruction means 10 and the cancellation instruction means 11, the range driving means 46, the hot air heater driving means 47, the grill heater driving means 48, the steam heater It has a function of outputting a drive control signal to the drive means 49 and the motor drive means 50 and outputting a display control signal to the display means 6.

  When the microcomputer 41 receives an operation signal accompanying the pushing operation from the first heating condition setting means 8, the second heating condition setting means 9, or the heating start instruction means 10, the microcomputer 41 sends a control signal corresponding to the operation signal, The range driving means 46, the hot air heater driving means 47, the grill heater driving means 48, the steam heater driving means 49, and the motor driving means 50 are sent to the corresponding microwave supply means 31, the hot air heater 23, The grill heater 27, the steam heater 29, and the hot air motor 25 are respectively controlled to perform various heating cooking on the heated object accommodated in the cooking chamber 2. At the time of control, the detection signal from the internal temperature detection means 42 for detecting the temperature in the cooking cabinet 2 and the detection signal from the internal temperature distribution detection means 43 for detecting the temperature distribution in the cooking cabinet 2 are referred to. The temperature in the cooking chamber 2 is controlled to a predetermined value.

  In this embodiment, upon receiving a control signal from the microcomputer 41 to the motor driving means 50, a driving voltage is applied to the hot air motor 25 and the hot air fan 24 rotates in the internal space of the hot air fan unit 21. Air is sucked toward the hot air fan 24 through the hole 26 located in the central portion on the side, and this air passes through the hot air heater 23 energized by the hot air heater driving means 47 in the internal space of the hot air fan unit 21. Heated. And the heated air is discharged | emitted from another hole 26 arrange | positioned at the inner wall surface 22, becomes the structure which circulates the whole inside the cooking chamber 2, and oven-cooks the to-be-heated material accommodated there. Yes.

  In addition to or in combination with oven cooking, when a control signal is sent from the microcomputer 41 to the grill heater driving means 48 and the grill heater 27 is energized, radiation from the upper surface of the cooking chamber 2 into the cooking chamber 2 is emitted. The object to be heated is cooked on the grill by heating. Instead, when a control signal is sent from the microcomputer 41 to the steam heater driving means 49 and the steam heater 29 is energized, water carried from the tank (not shown) to the steam generating means 28 is heated to become superheated steam, By being supplied from the generating means 28 into the cooking chamber 2, the heated object is steam-cooked. Further, when a control signal is sent from the microcomputer 41 to the range driving means 46, microwaves are radiated from the microwave supply means 31 into the cooking cabinet 2 with an output corresponding to the control signal, and the object to be heated is cooked in the range. It is configured to be.

  As an example, the power (power consumption) of the hot air heater 23 here is 700 W for the upper hot air heater 23A and 700 W for the lower hot air heater 23B. When energized at the same time, the hot air heater 23A can be heated with a maximum power of 1400 W. It is configured. Similarly, the grill heater 27A has a power of 700W for the grill heaters 27A and 27B, and the steam heater 29 has a power of 700W for the steam generation heaters 29A and 29B. Further, the input power to the microwave supply means 31 corresponding to the range input is configured to be in the range of 900 W to 1400 W according to the drive signal from the range drive means 46. That is, the maximum power consumption when the hot air heater 23, the grill heater 27, the steam heater 29, and the microwave supply means 31 are operated independently is slightly lower than 1500 W (100V-15A) that is the rated power of the outlet. Set to low.

  The microcomputer 41 outputs a control signal that does not exceed 1500 W (100 V-15 A), which is the rated power of the outlet, when the total power consumption when all or some of these heating means are energized at the same time as the drive means range. It has a function as a heating control means for sending to the driving means 46, the hot air heater driving means 47, the grill heater driving means 48, the steam heater driving means 49, and the motor driving means 50. In particular, the microcomputer 41 of the present embodiment refers to the detection signal from the current detection means 45 so that the input current to the main body 1 does not exceed the rated current of the outlet, for example 15A, The hot air heater 23, the grill heater 27, and the steam heater 29 are each controlled.

  The hot air heater driving means 47 of the present embodiment can be realized by using relays connected to the upper hot air heater 23A and the lower hot air heater 23B. In this case, the upper hot air heater 23 </ b> A and the lower hot air heater 23 </ b> B receive the control signal from the microcomputer 41 and are individually and independently controlled for power interruption.

  Next, the operation of the microwave oven will be described in detail with reference to FIG. 4 and FIG.

FIG. 4 shows the operation timing of the hot air heater 27 during oven cooking. In the figure, the horizontal axis indicates the elapsed time from the start of heating, and the vertical axis indicates the input power to the hot air heater 27, that is, the power consumption of the hot air heater 27. In addition, "hot air oven (top)"
The region surrounded by the frame corresponds to the energization period of the upper hot air heater 23A, and the region surrounded by the frame of “hot air oven (lower)” corresponds to the energization period of the lower hot air heater 23A.

  When the microcomputer 41 receives the operation signal from the operation means 7 and determines that the start of the oven cooking is instructed, the hot air heater is configured to continuously energize both the upper hot air heater 23A and the lower hot air heater 23B at the beginning of heating. A control signal is sent to the drive means 47. Thereby, the inside of the cooking cabinet 2 can be heated quickly and the temperature in the cooking cabinet 2 can be raised. Thereafter, the detection signal from the internal temperature detection means 42 is captured, and the preheating time until the temperature in the cooking chamber 2 reaches the set temperature is 1400 W, which is the sum of the maximum power consumption of the upper hot air heater 23A and the lower hot air heater 23B. Continue heating.

  When the temperature in the cooking chamber 2 reaches the set temperature, preheating ends, and the microcomputer 41 repeatedly turns on and off the upper hot air heater 23A, for example, as one side of the hot air heater 27, and turns off the other lower hot air heaters 23B. Thus, based on the detection signal from the internal temperature detection means 42, the energization rate of the upper hot air heater 23A is variably controlled so that the temperature in the cooking chamber 2 is kept constant. The control at this time can be realized by using a relay as the hot air heater driving means 47 and turning the relay on and off.

  As shown in FIG. 4, after preheating is completed, a state in which only 700 W of electric power is used can be realized, so there is a margin of 800 W with respect to 1500 W that is the rated current of the outlet. Therefore, when the microcomputer 41 performs both oven cooking and grill cooking in response to an operation signal from the operating means 7, one of the grill heaters 27 is repeatedly turned on and off after the preheating is completed. Only the heater 27A for the grill is continuously turned on to heat the object to be heated in the cooking cabinet 2. FIG. 5 shows the temperature in the cooking chamber 2 at this time, that is, the operating temperature of the hot air heater 23 and the grill heater 27.

  In the figure, K is a set temperature after preheating, and the microcomputer 41 continuously energizes both the upper hot air heater 23A and the lower hot air heater 23B simultaneously until the temperature in the cooking chamber 2 reaches, for example, 250 ° C. When preheating is performed and preheating is completed, only the upper hot air heater 23A is controlled on and off this time so that the temperature in the cooking chamber 2 is continuously maintained at the set temperature K, for example, 200 ° C. to 230 ° C. After the preheating, the grill heater 27A with an output of 700 W is continuously turned on in addition to repeatedly turning on and off the upper hot air heater 23A with an output of 700 W so as not to exceed the rated power of the outlet. Accordingly, it becomes possible to quickly bake the surface of the cooked food that is the object to be heated and to give it a crisp color or to finish it crisply under the restriction condition of 1500 W or less which is the rated power of the outlet.

  When the microcomputer 41 performs both oven cooking and steam cooking in response to an operation signal from the operation means 7, the steam heater 29 can be used instead of the grill heater 27 described above. In this case, only one steam generating heater 29A in the steam heater 29 is continuously turned on while the upper hot air heater 23A is repeatedly turned on and off after the preheating is completed. Thereby, steam can be efficiently supplied into the cooking chamber 2 from the steam generating means 28 under the restriction condition of 1500 W or less, which is the rated power of the outlet, and oven cooking or steam cooking by heating using superheated steam is possible. It can be realized well in a short time.

As described above, in the above-described embodiment, the appliance is an electric heating apparatus such as a microwave oven that operates by receiving power supply from an outlet, and the cooking chamber 2 that houses an object to be heated and the hot air heater 23 as a plurality of heating means. Further, as a power adjustment means that includes a grill heater 27, a steam heater 29, and a microwave supply means 31, and that can individually adjust the power of these heating means, hot air heater drive means 47, grill heater drive means 48, a steam heater driving means 49, and a range driving means 46 are provided. The microcomputer 41 is provided with heating control means for limiting the total power consumption when at least two of these heating means are energized at the same time so as not to exceed the rated power of the outlet, for example, 1500 W.

  In this case, among the plurality of heating means, for example, when the on-off control of, for example, the hot air heater 23 which is the first heating means is performed by a control signal from the heating control means of the microcomputer 41, the cooking chamber 2 is substantially heated. While the power consumption of the hot air heater 23 is reduced by the hot air heater driving means 47 to the extent that the amount is not impaired, another second second power is obtained by setting the power obtained by subtracting the power consumption of the hot air heater 23 from the rated power of the outlet. As the heating means, for example, the power consumption of the grill heater 27 and the steam heater 29 is appropriately adjusted by the corresponding grill heater driving means 48 and the steam heater driving means 49 so that the hot air heater 23 and the grill heater 27 or the steam are supplied. Heating can be performed simultaneously by both of the heaters 29. Therefore, it is possible to provide an electric heater with improved heating performance by efficiently using a plurality of heating means within a range limited by the rated power of the outlet.

  Moreover, in the said Example, it has the current detection means 45 which can detect the input current which flows into the main body 1 from an outlet, and the heating control means of the microcomputer 41 does not exceed the rated current of the outlet so that the input current from the outlet does not exceed. It has the structure which controls each of several heating means.

  In this case, by providing the current detection means 45, when the input current to the electric appliance exceeds the rated current of the outlet, for example, it is possible to reliably stop the electric appliance so that the electric appliance does not operate. The effect which can be used for is obtained.

Furthermore, in the said Example, the hot air heater 23 which is the 1st heating means in the said heating means contains the upper hot air heater 23A and the lower hot air heater 23B as several electric heaters, and a heating means is the hot air heater 23 and Has a second heater, a grill heater 27 and a steam heater 29. The heating control means of the microcomputer 41 has a total power consumption when the upper hot air heater 23A and the lower hot air heater 23B are energized simultaneously. The upper hot air heater 23A, which is a part of the electric heater, is turned on / off so that the temperature in the cooking cabinet 2 is maintained at the set temperature, and is also a part of the grill heater 27. the steam-generating heater 29A which is part of the grill heater 27A or steam heater 29 continuously turned on, and the upper hot air heaters 23A, grille The total power consumption when heating and over motor 27A and the steam generation heater 29A, at the same time are also likewise to be equal to or less than the rated power of the outlet, has a structure for controlling a plurality of heating means respectively.

In this way, for example, simultaneously energized on a hot air heater 23A and the lower hot air heater 23B for heating initial stage performs heating as the total power consumption reaches around the rated power of the outlet, for example, the interior of the cooking chamber 2 is When the set temperature is reached, the upper hot air heater 23A, which is a part of the plurality of electric heaters, and the second heating means other than the electric heater, for example, the grill heater 27A or the steam generating heater 29A, Can be operated at the same time so that the total power consumption reaches the rated power of the outlet. Therefore, an effect that the heating performance can be further improved by combining a plurality of electric heaters and a second heating means other than the electric heater as an electric heater is obtained.

  Next, a first modification of the above embodiment will be described. Here, as heating means, hot air heater 23 with a maximum power consumption of 1400 W, grill heater 27 with a maximum power consumption of 1100 W, steam heater 29 with a maximum power consumption of 1200 W, and microwave supply means 31 with a maximum input power of 1400 W. In particular, the above-described hot air heater driving means 47 is provided as a variable power adjusting means capable of changing the power of the hot air heater 23.

  Specifically, the hot air heater driving means 47 uses an AC-AC voltage inverter that receives a control signal from the microcomputer 41 and converts an AC input voltage into another AC output voltage. In this case, for example, a voltage with an output of AC 70V can be supplied to the hot air heater 23 with respect to the applied voltage of AC 100V, and the electric power of the hot air heater 23 is not gradually increased according to the control signal. It becomes possible to change. In addition, an AC-DC converter may be used instead of the AC-AC voltage inverter. In this case, for example, a voltage with an output of DC 70 V may be supplied to the hot air heater 23 with respect to an applied voltage of AC 100 V. The same heater heating can be realized. Such a configuration is applicable not only to the hot air heater driving means 47 but also to the grill heater driving means 48 and the steam heater driving means 49.

  When an AC-AC voltage inverter or an AC-DC converter is used as the hot air heater driving means 47 as in this modification, the electric power of the hot air heater 23 can be continuously varied within a range of 1400 W to 700 W, for example. When a relay is used as the hot air heater driving means 47 as in the embodiment, the electric power of the hot air heater 23 can be varied in two stages of 1400 W and 700 W, for example. In any case, the power consumption of the hot air heater 23 is set to 1400 W, which is slightly lower than 1500 W (100 V-15A), which is the rated power of the outlet, and can be varied from that to half.

  Further, when the above-described AC-AC voltage inverter or AC-DC converter is used for the grill heater driving means 48 or the steam heater driving means 49, the power of the grill heater 27 or the steam heater 29 is, for example, 1100W to 1200W. Each can be continuously varied within the range of 800W. In other words, the power consumption of the grill heater 27 and the power consumption of the steam heater 29 are set to 1400 W, which is slightly lower than the rated power of the outlet, and the power consumption of the hot air heater 23 is reduced from the maximum 1400 W to a half value of 700 W. When this is done, it is set to be variable up to 800 W, which is 700 W or less, which is a value obtained by subtracting the power consumption of the hot air heater 23 from 1500 W which is the rated power of the outlet.

  Instead, regardless of the electric power of the hot air heater 23, the electric power of the grill heater 27 and the steam heater 29 may be fixed to, for example, 800 W, which is equal to or lower than the value obtained by reducing the electric power of the hot air heater 23. In this case, it is not necessary to variably control the electric power of the grill heater 27 and the steam heater 29, and the configuration as an electric heater can be simplified. Other configurations are as described in the above embodiment.

  Also in this modified example, when the microcomputer 41 receives the operation signal from the operation means 7 and performs both oven cooking and grill cooking, the hot air heater 23 is first energized with 1400 W which is the maximum power consumption by preheating. The inside of the cooking chamber 2 containing the object to be heated is rapidly heated. And based on the detection signal from the internal temperature detection means 42, when the temperature in the cooking chamber 2 reaches a preset temperature, for example, 250 ° C., the preheating is finished, and then the microcomputer 41 sets the power of the hot air heater 23 to 700 W. The hot air heater 23 is repeatedly turned on and off so that the temperature in the cooking chamber 2 is maintained at, for example, 200 ° C. to 230 ° C. based on the detection signal from the internal temperature detection means 42 and the energization rate of the hot air heater 23 Is variably controlled. In this state, the microcomputer 41 energizes the grill heater 27 at 800 W, and grills the object to be heated from the upper surface of the cooking chamber 2 with infrared radiation heat. Thereby, for example, the surface of the gratin which is the object to be heated can be burnt quickly or the pizza can be baked crisply under the constraint condition of 1500 W or less which is the rated power of the outlet.

  When the microcomputer 41 performs both oven cooking and steam cooking in response to an operation signal from the operation means 7, the steam heater 29 is energized with 800 W instead of the grill heater 27 after preheating, and steam is supplied. The object to be heated is steam-cooked with steam from the generating means 28. Accordingly, when baking the bread to be heated, for example, under the restriction condition of 1500 W or less, which is the rated power of the outlet, while maintaining high temperature in the cooking chamber 2, the moisture is superheated from the steam generating means 28. It can be supplied and moistened, and an optimal heating configuration according to the cooking menu can be realized.

  Since this can be widely applied to various heating means other than the grill heater 27 and the steam heater 29, combination heating that effectively uses a plurality of heating means can be realized within the limitation by the rated power of the outlet.

As described above, in this modification, the first heater that heats the space 18 in the cooking chamber 2 as a plurality of heating means is an electric heating apparatus such as a microwave oven that operates by receiving power supply from an outlet. As a hot air heater 23, a grill heater 27 as a second heater that radiates and heats infrared rays into the cooking chamber 2, and a steam heater 29 as a steamer that supplies steam into the cooking chamber 2. The power consumption of the heater 23 is configured to be variable from 1400 W, which is equal to or less than, for example, 1500 W, which is the rated power of the outlet, up to 700 W, which is about half the value. The power consumption of each of the grill heater 27 and the steam heater 29 is at most equal to or less than the rated power of the outlet, and the power consumption of the hot air heater 23 is maintained at the set temperature. When the hot air heater 23 is controlled to be turned on / off , the grill heater 27 and the steam heater are less than the value obtained by subtracting the power consumption of the hot air heater 23 from the maximum power consumption value of the grill heater 27 and the steam heater 29. Each of the 29 power consumptions can be varied, or can be fixedly set.

In this case, among the plurality of heating means, for example, the hot air heater 23 is adjusted to the maximum power consumption substantially equal to the rated power of the outlet, and the preheating for rapidly heating the cooking chamber 2 is performed. While reducing the power consumption of the heater 23 to half value and maintaining the inside of the cooking cabinet 2 at a high temperature, the hot air heater 23 is on / off controlled, and the power consumption of another grill heater 27 is changed from the rated power of the outlet to the hot air heater 23. When the grill heater 27 is energized while being variable or fixed in advance to the value obtained by subtracting the power consumption, it is possible to quickly burn or crisp the heated object in the cooking cabinet 2. In addition, the steam heater 29 is energized in place of the grill heater 27 to supply moisture with superheated steam into the cooking chamber 2 while maintaining the inside of the cooking chamber 2 at a high temperature. You can bake things moist. Therefore, it is possible to improve the heating performance by efficiently using a plurality of heating means within the range limited by the rated power of the outlet, and realize an optimal heating configuration according to the cooking menu. .

  In addition, as a heating means incorporated in the microwave oven, a configuration arrangement as shown in FIG. 6 is also possible. Here, a hot air heater 23 with a maximum power consumption of 1000 W, a grill heater 27 with a maximum power consumption of 1450 W, a steam heater 29 with a maximum power consumption of 450 W, and a microwave supply means 31 with a maximum input power of 1450 W are provided. In particular, the grill heater 27 has a maximum power consumption of 1000 W for radiant heating from the upper surface of the cooking chamber 2 and an upper grill heater 27C for radiant heating from the lower surface of the cooking chamber 2 for a lower grill of 450 W. And a heater 27D.

  The microwave oven shown in FIG. 6 also selects a specific heating means from among a plurality of heating means as an optimum heat source for cooking, individually controls the power of each heating means, and simultaneously turns on the plurality of heating means. Combination heating can be realized.

  For example, when grill cooking and steam cooking are performed in combination, only the upper grill heater 27C is selected from among the grill heaters 27 and power is cut off, and the steam heater 29 is also selected and cut off. Thus, for example, tea-boiled steamed fish and grilled fish can be cooked and heated at the same time within a limit of the rated power of the outlet with a maximum power consumption of 1450 W. In this case, it is preferable to place the fish on the aforementioned square plate 17 inserted into the cooking cabinet 2 and to place the steamed rice cake on the lower surface of the cooking cabinet 2 so that the radiant heat from the upper grill heater 27C is concentrated on the fish. The steam from the steam generation means 28 is intensively supplied to the steaming of the tea.

  FIG. 7 shows that when the upper grill heater 27C and the steam heater 29 are disconnected, the temperature of the central portion of the square plate 17 (solid line) and the temperature of the egg liquid that is steamed with the chafeng (broken line) The graph shows how this changes. In grill cooking using the upper grill heater 27C, heating is continued for 16 minutes at a temperature of 100 ° C. or higher, and it can be seen that the grilled fish placed on the square plate 17 is burnt well. In the steam cooking using the steam heater 29, the egg liquid charged in the tea bowl has reached 80 degrees and is firmly set. Conventionally, since grill cooking and steam cooking are performed separately, cooking time of 40 minutes is required. However, in this example, the cooking time is 25 minutes (15 minutes reduction).

  Further, in the case of performing both oven cooking and steam cooking, the hot air heater 23 is selected in the heating means to cut off power, and the steam heater 29 is also selected to cut off power. Within the limit of the rated power, for example, the bread to be heated in the cooking cabinet 2 can be cooked and heated softly with a maximum power consumption of 1450 W. In this case, the bread dough is placed on the square plate 17 inserted in the cooking chamber 2 for cooking.

  FIG. 8 shows the temperature of the square plate 17 when the conventional hot air heater 23 is turned on / off (broken line) and when the hot air heater 23 and the steam heater 29 are disconnected (solid line) as in this example. The graph shows how it changes over time. FIG. 8 is a timing chart showing how the hot air heater 23 and the steam heater 29 are disconnected.

  Conventionally, it can be seen that as the hot air heater 23 is turned on and off, the temperature fluctuation width of the square plate 17 increases. On the other hand, in the combination heating by the hot air heater 23 and the steam heater 29 of this example, the temperature of the square plate 17 rises smoothly by filling the cooking chamber 2 with the steam, and the temperature fluctuation of the square plate 17 changes. The width is also small. Therefore, the bread in the cooking chamber 2 placed on the square plate 17 can be baked softly and softly by combination heating by oven cooking and steam cooking.

  FIG. 9 shows a second embodiment in which the electric heating apparatus of the present invention is applied to a high-power cooker 61. First, from the configuration of the power system S that supplies power to the high-power cooker 61, 71 is a utility pole installed outdoors, 72 is a lead-in wire drawn from the utility pole 71, and 73 is attached to the eaves of the house A. In each house A, the power supplied from the electric power company is led indoors through the lead-in line 72 and the electric meter 73 in order.

  The indoor side includes a contract breaker 74 for distributing only a contract current with the power company, a plurality of indoor wirings 75 branched from the contract breaker 74, individual breakers 76 connected to each indoor wiring 75, A plurality of outlets 77A and 77B connected to the end of the indoor wiring 75 are installed. The rated power of each outlet 77A, 77B is 1500V of 100V-15A, and the current input through the contract breaker 74 is branched into a plurality and distributed to each indoor wiring 75. When a current (20 A in this embodiment) flows, the individual breaker 76 is configured to cut off the distribution of the indoor wiring 75.

  Next, the configuration of the high-power cooking device 61 will be described. 81 is a box-shaped main body, 82A and 82B are cords with plugs provided on the main body 81, and each cord 82A and 82B with plugs is an arbitrary outlet 77A. , 77B are detachably connected. FIG. 9 shows a mode in which one plug-attached cord 82A is attached to the outlet 77A, and the other plug-attached cord 82B is attached to the outlet 77B connected to the same indoor wiring 75 as the outlet 77A. The cords 82A and 82B may be connected to any different outlet in the house A.

  Inside the main body 81, there is a cooking chamber 85 that accommodates an object to be cooked, a first heater 86 disposed at the lower portion of the cooking chamber 85, a second heater 87 disposed at the upper portion of the cooking chamber 85, and a first heater 86. Switchable relay contact 88 connected in series with the second heater 87, switchable relay contact 89 connected in series with the second heater 87, and an energization detecting device for detecting a current flowing through the plug-attached cord 82B, an applied voltage, and the like. 90 and a control device 91 including a microcomputer are provided. In the lower part of the main body 81, operation buttons 93 for selectively using the first heater 86 and the second heater 87, setting a heating time, a cooking course, and the like, a heating time, a current time, and the like are displayed. A display 94 is provided. The power consumption when the first heater 86 is energized is 1450 W, and the power consumption when the second heater 87 is energized is 450 W.

  The control device 91 receives an operation signal from the operation button 93 and a detection signal from the energization detection device 90, and receives a relay contact 88 that is a power adjustment unit for the first heater 86 and a power adjustment unit for the second heater 87. A control signal is sent to each relay contact 89 to control the power interruption of the first heater 86 and the second heater 87, respectively. In a state in which the contact 88 is closed, the first heater 86 obtains power from one plug-attached cord 82A and heats the object to be cooked from the lower surface of the cooking chamber 85 with power consumption of 1450 W. Moreover, in the state which closed another contact 89, the 2nd heater 87 obtains the electric power from the cord 82B with the other plug, and heats to-be-cooked material with the power consumption of 450 W from the upper surface of the cooking chamber 85. In particular, when the energization detecting device 90 detects that the cord 82B with the plug is connected to an arbitrary outlet 77B, for example, the control device sends a control signal to close both the contacts 88 and 89, and the first heater 86. And the second heater 87 are energized at the same time, and the cooking power in the cooking chamber 2 is controlled with cooking power dedicated to high power not exceeding the total power of 1900 W and the rated power of the individual breaker 76 of 2000 W (100 V-10A). It has a configuration as a heating control means for cooking food.

  In the above configuration, when cooking an object to be cooked with the high-power cooker 61 of the present embodiment, one plug-attached cord 82A is connected to, for example, an outlet 77A, and the other plug-attached cord 82B is connected to another outlet 77B. Then, a cooking course in which the first heater 86 and the second heater 87 are energized at the same time by the operation button 93 is selected. In response to this, the control device 91 sends a control signal for closing the contact 88 of the relay, energizes the first heater 86, and heats the object to be cooked from the lower surface of the cooking chamber 85 with power consumption of 1450 W. At the same time, when the energization detection device 90 detects that the plug-attached cord 82B is connected to the outlet 77B, the control device 91 receives the detection signal from the energization detection device 90 and closes the relay contact 89 from the control device 91. A signal is sent to turn on the second heater 87. Thereby, in addition to the heating from the 1st heater 86, the to-be-cooked object can be simultaneously heated from the upper surface of the cooking chamber 85 with the power consumption of 450 W by the 2nd heater 87. FIG.

  Thus, in the high power cooking device 61 of the present embodiment, a large heating amount exceeding the rated power can be obtained with the indoor wiring 75 of a general household in which the outlets 77A and 77B having a rated power of 1500 W are connected to the ends. For example, in the case of a microwave oven, by raising the output of the microwave supply means 31 from 1000 W to 1100 W to 1200 W (input power from 1400 W to 1500 W to 1600 W is required) as a range output during cooking. , You can increase the heating speed of the food. In the case of oven cooking, a plurality of heating means exceeding the rated power of the outlets 77A and 77B, such as shortening the preheating time, a combination of oven cooking and steam cooking with superheated steam, or a combination of oven cooking and grill cooking Simultaneous heating is possible, and by combining the shortening of the cooking time and the overheating pattern, a heating configuration suited to the purpose of cooking can be realized.

  In the case of another rice cooker, a plurality of heating means for heating the container are provided, and the plurality of heating means are energized simultaneously during the period from the start of cooking rice to boiling, and the container is temporarily used with a total power consumption of 1900 W. The cooking object is heated, and thus the cooking object is boiled in a short time, so that the cooking time can be shortened and the uneven cooking can be reduced. Further, in the case of an iron, a plurality of heating means are embedded in a base that is a hanging surface, and the plurality of heating means are energized simultaneously until the base reaches an appropriate temperature set. As a result, the base is heated with the total power consumption exceeding the rated power of the outlets 77A and 77B, and the temperature rise speed of the base is increased, so that it is possible to reduce the waiting time and improve the practicality.

  Thus, in this embodiment, the high-power cooker 61 is an electric heating appliance that operates by receiving power supply from the outlets 77A and 77B, and each of the first heater 86 and the second heater 87 is used as a plurality of heating means. In addition, relays 88 and 89 that open and close in response to a control signal are provided as power adjustment means that can individually adjust the power of the first heater 86 and the second heater 87. The control device 91 is provided with heating control means that allows the total power consumption when the second heater 87 and the second heater 87 are simultaneously energized to be adjusted to the power exceeding the rated power of the outlets 77A and 77B.

  In this case, among the plurality of heating means, several heating means, the first heater 86 and the second heater 87 are selectively energized at the same time, and the heating amount is reduced to the total power consumption exceeding the rated power of the outlet. Heating can be performed by adjusting. Therefore, the electric appliance which can improve a heating performance more can be provided by adding the heating amount more than the rated power of an outlet socket.

  Further, in this embodiment, cords 82A and 82B with plugs are provided as connecting means connectable to a plurality of outlets 77A and 77B, and the heating control means of the control device 91 simultaneously connects the first heater 86 and the second heater 87. The first heater 86 and the second heater 87 are set so that the total power consumption when energized is limited to the rated power or less of the individual breaker 76 serving as a circuit breaker connected in common to the plurality of outlets 77A and 77B. It has a configuration to control.

  In this case, by restricting the power consumption of the high-power cooker 61, which is an electric heater, below the rated power of the individual breaker 76 that can flow in one circuit of the indoor wiring 75, the plurality of adjacent outlets 77A, 77B The power exceeding the rated power of the individual outlets 77A and 77B can be secured safely without overloading the indoor wiring 75, and can be obtained in the high-power cooking device 61.

  In addition, this invention is not limited to the said Example, A various change is possible in the range which does not deviate from the meaning of this invention. The “electric heating appliance” as used in the present invention includes all consumer electric devices that can be supplied with power from at least an outlet and energize a plurality of heating means, and include “a plurality of heating means” and “a plurality of electric heating devices”. The type and number of “heaters” are not limited to those described above. Moreover, the above-mentioned rated power of the outlet and the numerical value of the maximum power consumption of each heating means are merely examples.

2 Cooking room 23 Hot air heater (heating means , first heater )
2 7 Grill heater (heating means , second heater)
29 steam heater (heating means, vinegar Cima)

Claims (1)

An electric appliance that operates by receiving power from an outlet,
  As a plurality of heating means, a first heater that heats the space in the cooking chamber, a second heater that heats the cooking chamber by radiating infrared rays, and a steamer that supplies steam into the cooking chamber Prepared,
  The power consumption of the first heater is at most equal to or less than the rated power of the outlet, and is configured to be variable from there to about half value,
  Each of the power consumption of the second heater and the steamer is at most equal to or less than the rated power of the outlet, and the consumption of the first heater is so as to maintain the temperature in the cooking chamber at a set temperature. When power is reduced and the first heater is turned on / off, the maximum power consumption of the second heater or the steamer can be changed to a value less than the value obtained by subtracting the power consumption of the first heater. Alternatively, the electric heater may be configured such that the second heater or the steamer is energized in a fixedly set state.

Images