JPH05296466A - Heat-cooker - Google Patents

Abstract

PURPOSE:To prevent the heater from becoming a light emission stop condition during a heating operation at the time of a heating strength control, and at the same time, prevent noise from generating, for a heat-cooker which performs a heat-cooking by a light emitting type heater. CONSTITUTION:Halogen lamp heaters 21 and 22 are switched to either one of parallel and serial connections by a serial/parallel connection switching means 38. Also, halogen lamp heaters 23 and 24 are switched to be ON of OFF by a triac 41. A control circuit 39 controls the serial/parallel connection switching means 38 and triac 41 in response to a set heating strength. In this case, the halogen lamp heaters 21 and 22 are always being connected to the power.

Description

Detailed Description of the Invention

[0001]

The present invention has a plurality of heaters,
The present invention relates to a heating cooker in which an object to be heated is placed on the upper part of these heaters to perform heating cooking.

[0002]

2. Description of the Related Art Conventionally, as a heating cooker of this kind,
So-called cooking heaters are known. In FIG.
The cooking heater incorporated in the kitchen as a system kitchen is shown. A range portion 5 having heater units 2, 3 and 4 is incorporated in the cabinet 1, and a top plate 6 made of translucent heat-resistant glass is provided above the heater units 2, 3 and 4. .. The heater units 2 and 3 have the same structure having a light-emitting heater, and the other heater unit 4 has a nichrome wire heater.

The heater units 2 and 3 have, for example, four halogen lamp heaters 7 as light emitting heaters. A temperature sensitive portion 8 of a safety switch is provided on the halogen lamp heater 7.

However, when cooking with the heater unit 2, for example, a cooking pot as an object to be heated is placed on the top plate 6, and the halogen lamp heater 7 is energized to heat the object to be heated. ing.

[0005]

By the way, in this system, there is a heating intensity control method in which the heater 7 is controlled to be turned on and off in accordance with the set heating intensity. That is,
When the heating intensity is set high, the ON time ratio in one ON / OFF cycle is controlled to be long, and when the heating intensity is set low, the ON time ratio is controlled to be short.

However, in this case, when the heating intensity is set low, the heater 7 may not appear to emit light because the ON time is short, and the user may feel that the top plate is hot. However, there is a risk of misunderstanding that the heating operation has ended.

On the other hand, as another heating intensity control method, there is one in which the heating intensity is controlled by controlling the input to the heater 7 by phase control.

In this case, since the heaters 6 to 9 are always in a state of emitting light, it is not erroneously recognized that the operation is completed. However, on the other hand, there is a problem that noise is generated when the switching element used for phase control is ignited. To prevent this, a noise filter is required, resulting in high cost. Moreover, even if a noise filter is used, the noise cannot be completely removed, and the noise enters the telephone or the like.

The present invention has been made in view of the above circumstances, and an object of the present invention is to cook an object to be heated by using a luminescent heater for controlling the heating intensity during heating operation. It is an object of the present invention to provide a heating cooker that does not cause noise and is not mistakenly recognized as having finished operation.

[0010]

The cooking device of the present invention comprises:
In the case where at least three or more light-emitting heaters are provided and an object to be heated is placed above the heaters to perform cooking, switching between parallel connection and series connection for at least two heaters Direct / parallel connection switching means, on / off switching means for switching on / off of other heaters, direct / parallel connection switching by the direct / parallel connection switching means and on / off switching by the on / off switching means according to the set heating intensity And a heating intensity control means for controlling the above (see the invention of claim 1).

A heating cooker of another invention has a plurality of light emitting heaters, and an object to be heated is placed on the upper part of these heaters for heating and cooking. Full / half-wave switching means for switching between full-wave and half-wave energization, on / off switching means for switching on / off of other heaters, and full / half-wave by the full / half-wave switching means according to the set heating intensity. The present invention is characterized in that it is provided with a heating intensity control means for controlling switching between wave energization and on / off switching by the on / off switching means (the invention of claim 2).

[0012]

According to the first aspect of the present invention, in order to control the heating intensity, the heaters are switched in series and in parallel, so that some of the heaters are always energized to continuously emit light. Therefore, even if the other heaters are controlled to be switched on and off, it is not erroneously recognized that the operation has ended during the heating operation. Further, unlike the case of the phase control, noise is not generated in both the heater direct / parallel switching and the heater on / off switching. It is difficult to make the heating intensity setting level finer by the heating control only by switching the heaters directly and in parallel, but in the present invention, since the heater on / off control is also performed, the heating intensity setting level can be made finer.

According to the second aspect of the present invention, the heating intensity is controlled by switching between full-wave energization and half-wave energization of the heater, so that some of the heaters always emit light. Therefore, even if the other heaters are controlled to be turned on and off, it is not mistakenly recognized that the operation has ended during the heating operation. Also, when switching between full- and half-wave energization of the heater, the half-wave is cut at the voltage zero level,
No noise is generated, and no noise is generated when the heater is switched on and off. The heating strength setting level can be made fine as in the above.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In FIG. 2, a cooking heater is shown as a heating cooker, and this cooking heater is incorporated in the kitchen as a system kitchen.

A range portion 12 is incorporated on the upper surface of the cabinet 11, a roaster portion 13 having a roaster heater 13a (see FIG. 1) is incorporated from the front surface to the inside, and on the left and right sides of the roaster portion 13 on the front surface, Operation panels 14 and 15 are incorporated.

A first heater unit 17, a second heater unit 18, and a third heater unit 19 are arranged inside the case 16 of the range section 12. The first heater unit 17 and the second heater unit 18 are provided with a halogen lamp heater which is a light emitting heater, and the third heater unit 19 is provided with a nichrome wire heater having a poor light emitting property. And case 1
6, a top plate 20 is provided so as to cover these heater units 17 to 19.

The first heater unit 17 and the second heater unit 18 have the same structure, and the first heater unit 17 will be described below. That is, in this heater unit 17, four halogen lamp heaters 21 to 24 are arranged substantially in parallel, and the halogen lamp heaters 21 and 22 are located outside. A temperature sensing portion 25a of a safety switch 25 (see FIG. 1) is provided above the halogen lamp heaters 21 to 24. The safety switch 25 is configured to open when the temperature sensing unit 25a detects a limit temperature of 800 ° C.

The operation panels 14 and 15 have a first
Operation unit 26 for the heater unit 17, the operation unit 27 for the second heater unit 18, and the third heater unit 19
Operating part 28 and operating part 29 for roaster part 13
Are arranged.

The operating portion 26 for the first heater unit 17
Since the operation section 27 for the second heater unit 18 has the same configuration, the operation section 2 for the first heater unit 17 is the same.
6 will be described.

The operating portion 26 includes a heating operation "ON" switch 30, a heating operation "OFF" switch 31, a heating intensity up switch 32, a heating intensity down switch 33, and eight heating intensity display lights. It is configured to have a diode 34. The operation portion 28 for the third heater unit and the operation portion 29 for the roaster portion 13 are not directly related to the present invention, and therefore description thereof will be omitted.

FIG. 1 shows the electrical configuration. The electric components included in the first heater unit 17 are connected between the power supply lines 35a and 35b of the AC power supply 35 as shown in the figure. That is, the relay switch 36, the halogen lamp heater 21, and the relay switch 37 are connected in series between the power supply lines 35a and 35b, and the other halogen lamps on the outer side in parallel with the relay switch 36 and the halogen lamp heater 21. The heater 22 is connected. The relay switches 36 and 37 constitute a serial / parallel connection switching means 38.

The relay switch 36 is normally provided with the contact a.
-C is closed, and when the relay 36a is driven, the contacts a-b are closed, and the fixed contact c is connected to the power supply line 35b. This relay 3
6a and a relay 37 for opening and closing the relay switch 37
The symbol a is controlled by the control circuit 39 via the drive circuit 40.

Further, between the power lines 35a and 35b,
The safety switch 25 and the inner halogen lamp heater 2
3 and a triac 41 as an on / off switching means are connected in series, and another halogen lamp heater 24 inside is connected in parallel with the halogen lamp heater 23. The triac 41 is also controlled by the control circuit 39.
ON / OFF switching control is performed via the drive circuit 42.

The control circuit 39 comprises a microcomputer and an A / D converter. The control circuit 39 is supplied with operating power from the constant voltage circuit 43 and receives a zero cross detection signal from the zero cross circuit 44. Further, reset signals are respectively supplied from the reset circuit 45.

Further, the heating operation "ON", which is a component of the operating section 26, is further included in the control circuit 39.
Switch 30, heating operation "off" switch 31, heating intensity up switch 32, heating intensity down switch 33,
And eight light emitting diodes 34 for displaying heating intensity are connected. The components of the other operating units 27, 28 and 29 are also connected to this control circuit 39.

The control circuit 39 functions as heating intensity control means, and controls the heating intensity of the first heater unit 17 and the second heater unit 18 by the function of this heating intensity control means.

The case where the heating intensity of the first heater unit 17 is controlled will be described below. The control circuit 39
Based on the operation of the heating intensity up switch 32 or the heating intensity down switch 33, the heating intensity level is set to [strong],
"6", "5" ... "1" and "weak" are set to any one of eight levels. Then, the control content for each heating intensity level will be described with reference to FIG. 3 and Table 1.

[0028]

[Table 1]

(1) When the heating intensity level is "strong";
In the parallel connection switching means 38, the contact a-b of the relay switch 36 is closed, and the relay switch 37 is closed. Thus, the outer halogen lamp heaters 21 and 22 are connected in parallel. And TRIAC 41
Is continuously turned on to turn on the halogen lamp heaters 23 and 24. As a result, the outer halogen lamp heater 2
The rated inputs of 1 and 22 are 300 W, and the rated inputs of the inner halogen lamp heaters 23 and 24 are 600 W, respectively. At this time, the inner halogen lamp heaters 23 and 24 have a duty ratio of 100%. As a result, the heating intensity is "1800 W" for all heater inputs.

(2) When the heating intensity level is "6"; the contact points a and b of the relay switch 36 are closed and the relay switch 37 is closed, so that the halogen lamp heater 21 on the outside is closed.
And 22 are connected in parallel. The triac 41 is turned on for 9 cycles out of 12 cycles of the power supply frequency and turned off for 3 cycles.
It is turned on and off so that the duty ratios of 3 and 24 are 75%. As a result, the heating intensity is "1500" for all heater inputs.
W ”.

(3) When the heating intensity level is "5"; the contact points a and b of the relay switch 36 are closed, the relay switch 37 is closed, so that the halogen lamp heater 21 on the outside is closed.
And 22 are connected in parallel. The triac 41 is turned on for 4 cycles out of 12 cycles of the power supply frequency and turned off for 8 cycles, so that the halogen lamp heater 2 inside
It is turned on and off so that the duty ratios of 3 and 24 are 33%. As a result, the heating intensity is "1000" for all heater inputs.
W ”.

(4) When the heating intensity level is "4"; the contact points a and b of the relay switch 36 are closed, the relay switch 37 is closed, so that the halogen lamp heater 21 on the outside is closed.
And 22 are connected in parallel. The triac 41 is turned on for 2 cycles out of 12 cycles of the power frequency, and
The cycle is turned off, so that the halogen lamp heaters 23 and 24 inside are turned on and off so that the energization rate is 17%. As a result, the heating intensity is "800" for all heater inputs.
W ”.

(5) When the heating intensity level is "3"; the contacts a and b of the relay switch 36 are closed, and the relay switch 37 is closed, so that the halogen lamp heater 21 on the outside is closed.
And 22 are connected in parallel. The triac 41 is continuously turned off, so that the inner halogen lamp heaters 23 and 24 are turned off. As a result, the heating intensity is "600 W" for all heater inputs.

(6) When the heating intensity level is "2"; the contacts a and c of the relay switch 36 are closed, the relay switch 37 is opened, and thus the halogen lamp heater 21 on the outside.
And 22 are connected in series. The triac 41 is on for 3.5 cycles out of 12 cycles of power frequency,
It is turned off for 8.5 cycles, so that the inner halogen lamp heaters 23 and 24 are turned on and off so that the duty ratio is 29%. As a result, the rated inputs of the outer halogen lamp heaters 21 and 22 are "75 W", and the heating intensity is "500 W" for all heater inputs.

(7) When the heating intensity level is "1": The contacts a and c of the relay switch 36 are closed, the relay switch 37 is opened, and thus the halogen lamp heater 21 on the outside.
And 22 are connected in series. The triac 41 is on for 2.5 cycles out of 12 cycles of power frequency,
It is turned off for 9.5 cycles, so that the inner halogen lamp heaters 23 and 24 are turned on and off so that the duty ratio is 21%. As a result, the heating intensity is "400 W" for all heater inputs.

(8) When the heating intensity level is "weak": The contacts a and c of the relay switch 36 are closed, the relay switch 37 is opened, and the halogen lamp heater 21 on the outside is therefore closed.
And 22 are connected in series. Triac 41 is 1.5 cycles on out of 12 cycles of power frequency,
It is turned off for 10.5 cycles, so that the halogen lamp heaters 23 and 24 inside are turned on and off so that the energization rate is 12.5%. As a result, the heating intensity is "300 W" for all heater inputs.

According to this embodiment, the halogen lamp heaters 21 and 2 are used to control the heating intensity.
Since the serial / parallel switching of 2 is performed, the halogen lamp heaters 21 and 22 are always energized. Therefore, the inner halogen lamp heater 2 which is another heater
Although the outer halogen lamp heaters 21 and 22 continue to emit light despite the ON / OFF switching control of 3 and 24, there is no mistakenly recognizing that the operation has ended during the heating operation.

Further, noise is not generated in both the serial / parallel switching of the outer halogen lamp heaters 21 and 22 and the on / off switching of the inner halogen lamp heaters 23 and 24.

Furthermore, it is difficult to finely set the heating intensity setting level only by switching the heater series / parallel connection. However, in the present embodiment, since the heater on / off control, particularly the time control, is also performed, the heating intensity setting level is set to a low level. It can be set in multiple stages of the above eight stages.

Particularly, in this embodiment, since the inner halogen lamp heaters 23 and 24 are controlled to be turned on and off, the inner halogen lamp heaters 23 and 2 are controlled.
Even if the light emission 4 flickers as it is turned on and off, the flickering is blocked by the object to be heated placed on the top plate 20, and there is almost no effect.

In the above embodiment, the total input of the outer halogen lamp heaters 21 and 22 is 1/2 of the total input of the inner halogen lamp heaters 23 and 24.
The reason for the following is that the top plate 20 does not exceed the limit temperature even when only the outer halogen lamp heaters 21 and 22 are energized while the safety switch 25 is open.

Next, FIGS. 4 and 5 show a second embodiment of the present invention. That is, the inner halogen lamp heaters 21 and 22 are connected in parallel, and the heaters 21 and 22 are the triac 51 as the full / half-wave switching means.
By this, full-wave energization and half-wave energization can be switched. The triac 51 is controlled via a drive circuit 53 by a control circuit 52 that functions as heating intensity control means.

The control content for each heating intensity level will be described with reference to FIG. 5 and Table 2.

[0044]

[Table 2]

(1) When the heating intensity level is "strong": The triac 51 is continuously turned on to energize the outer halogen lamp heaters 21 and 22 in full wave. Then, the triac 41 is continuously turned on to turn on the halogen lamp heaters 23 and 24. As a result, the rated inputs of the outer halogen lamp heaters 21 and 22 are 300 W, and the rated inputs of the inner halogen lamp heaters 23 and 24 are 600 W, respectively. At this time, the inner halogen lamp heaters 23 and 24 have a duty ratio of 100%. Is.
As a result, the heating intensity is "1800 W" for all heater inputs.

(2) When the heating intensity level is "6": The triac 51 is continuously turned on to energize the outer halogen lamp heaters 21 and 22 in full wave. Triac 41 is 9 cycles on of 12 cycles of power frequency, and 3
The cycle is turned off, so that the halogen lamp heaters 23 and 24 on the inside are turned on and off so that the duty ratio is 75%. As a result, the heating intensity is "150" for all heater inputs.
0 W ”.

(3) When the heating intensity level is "5"; the triac 51 is turned on at every other half-wave timing of the power supply frequency, and the outer halogen lamp heaters 21 and 2 are turned on.
Energize 2 for half a wave. Triac 41 is 1 of power frequency
Of the 2 cycles, 7 cycles are turned on and 5 cycles are turned off, so that the inner halogen lamp heaters 23 and 24 are
Is turned on and off so that the energization rate of is 58%. As a result, the heating intensity is "1000 W" for all heater inputs.

(4) When the heating intensity level is "4"; the triac 51 is turned on at every other half-wave of the power supply frequency, and the outer halogen lamp heaters 21 and 2 are turned on.
Energize 2 for half a wave. Triac 41 is 1 of power frequency
Of the two cycles, five cycles are on and seven cycles are off, so that the halogen lamp heaters 23 and 24 inside
It is turned on and off so that the duty ratio of is 42%. As a result, the heating intensity is "800 W" for all heater inputs.

(5) When the heating intensity level is "3"; the triac 51 is turned on at every other half-wave timing of the power supply frequency, and the outer halogen lamp heaters 21 and 2 are turned on.
Energize 2 for half a wave. Triac 41 is 1 of power frequency
Of the two cycles, three cycles are on and nine cycles are off, so the inner halogen lamp heaters 23 and 24 are
Is turned on and off so that the energization rate is 25%. As a result, the heating intensity is "600 W" for all heater inputs.

(6) When the heating intensity level is "2": The triac 51 is turned on at every other half-wave timing of the power supply frequency, and the outer halogen lamp heaters 21 and 2 are turned on.
Energize 2 for half a wave. Triac 41 is 1 of power frequency
Of the two cycles, two cycles are turned on and 10 cycles are turned off, so that the halogen lamp heaters 23 and 2 inside
It is turned on and off so that the duty ratio of No. 4 is 17%. As a result, the heating intensity is "500 W" for all heater inputs.

(7) When the heating intensity level is "1": The triac 51 is turned on at every other half-wave of the power supply frequency, and the outer halogen lamp heaters 21 and 2 are turned on.
Energize 2 for half a wave. Triac 41 is 1 of power frequency
Of the two cycles, one cycle is on and 11 cycles are off, so that the halogen lamp heaters 23 and 2 inside
It is turned on and off so that the duty ratio of No. 4 is 8%. As a result, the heating intensity is "400 W" for all heater inputs.

(8) When the heating intensity level is "weak": The triac 51 is turned on at every other half-wave timing of the power supply frequency, and the outer halogen lamp heaters 21 and 2 are turned on.
Energize 2 for half a wave. The triac 41 is turned off. As a result, the heating intensity is "300 W" for all heater inputs.

According to the second embodiment, in controlling the heating intensity, the outer halogen lamp heaters 21 and 22 are switched between full-wave energization and half-wave energization.
As a result, the heaters 21 and 22 are configured to emit light at all times. Therefore, even though the other heaters 23 and 24 are controlled to be turned on and off, the heaters 21 and 22 continuously emit light, so that it is not erroneously recognized that the operation has ended during the heating operation.

When switching the full / half-wave energization of the heaters 21 and 22, the half-wave is cut at the voltage zero level.
No noise is generated, and noise is not generated when the heaters 23 and 24 are switched on and off.

In each of the above embodiments, the halogen lamp heater is exemplified as the light emitting heater, but a molybdenum silicide heater or the like can be considered as the light emitting heater.
Further, in the case of conducting half-wave energization, a half-wave rectifying circuit may be used as the full / half-wave switching means. Further, when the heater is switched on and off, the heater may be switched on and off in units of seconds instead of the cycle control described above.

In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the spirit of the invention, for example, the number of heaters may be changed appropriately. ..

[0057]

As is apparent from the above description, the present invention does not cause the heater to be in a light emission stop state during the heating operation in the case where the light emitting heater is used for heating and cooking. This has an excellent effect of not erroneously recognizing that the operation has ended, and of not generating noise unlike the case where the phase control is performed.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing a first embodiment of the present invention.

FIG. 2 is an overall perspective view

FIG. 3 is a diagram showing the control contents of a heater according to each heating intensity level.

FIG. 4 is an electric circuit diagram showing a second embodiment of the present invention.

FIG. 5 is a diagram showing the control contents of a heater according to each heating intensity level.

FIG. 6 is an overall perspective view showing a conventional example.

[Explanation of symbols]

17 is the first heater unit, 20 is the top plate,
21 to 24 are halogen lamp heaters, 25 is a safety switch, 25a is a temperature sensing part, 32 is a heating intensity up switch, 33 is a heating intensity down switch, 38 is a serial / parallel connection switching means, 39 is a control circuit (heating intensity control). Means), 4
Reference numeral 1 is a triac (on / off switching means), 51 is a triac (full / half-wave switching means), and 52 is a control circuit (heating intensity control means).

Claims (2)

[Claims] 1. A parallel connection of at least two heaters, comprising at least three luminescent heaters, wherein an object to be heated is placed above the heaters for cooking. And a series / parallel connection switching means for switching the series connection, an on / off switching means for switching on / off of other heaters, a series / parallel connection switching by the series / parallel connection switching means and the on / off according to the set heating intensity. A heating cooker comprising: heating intensity control means for controlling ON / OFF switching by the switching means. 2. A heater having a plurality of luminescent heaters, wherein an object to be heated is placed on an upper portion of these heaters to perform heating and cooking, and one heater is full-wave energized and half-wave energized. Full / half-wave switching means for switching between and, and on / off switching means for switching on / off of other heaters,
Cooking characterized by comprising heating intensity control means for controlling full / half-wave energization switching by the full / half-wave switching means and on / off switching by the on / off switching means according to the set heating intensity vessel.