JPS5813201Y2 - Forced circulation gas oven - Google Patents

Description

[Detailed description of the invention] The present invention relates to a forced circulation gas oven, in particular, it is equipped with an electric heater as a heat source for a low-temperature region and a gas burner as a heat source for a high-temperature region, and by appropriately switching between these two heat sources. This invention relates to an improvement of a forced circulation type gas oven that is capable of exhibiting the heating function and heat retention function in the two areas, and the oven function in the high temperature area.

Conventionally, in this type of forced circulation gas oven, a switch for switching between the two heat sources and a switch for driving the forced circulation blower are linked, and the heat source is switched from an electric heater to a gas burner by switching the switch. When the heat source is switched from the gas burner to the electric heater, the blower is driven, and when the heat source is switched from the gas burner to the electric heater, the blower is stopped.

However, in this type of forced circulation gas oven, when the heat source is switched from a gas burner to an electric heater, the blower stops driving, so the temperature inside the heating chamber of the gas oven is lowered to a predetermined temperature in the low temperature range. It takes a considerable amount of time to lower the temperature, and after oven cooking (high-temperature cooking), it is necessary to continue fermenting bread, thawing frozen foods, etc. (low-temperature cooking).
This will cause problems when doing so.

The present invention was developed to solve these problems, and its main purpose is to quickly reduce the temperature inside the oven heating chamber to a predetermined temperature in the low temperature range when the heat source is switched from a gas burner to an electric heater. To enable low-temperature cooking to be completed quickly after high-temperature cooking.

An embodiment of the present invention will be described below with reference to the drawings.

1 and 2, reference numeral 10 indicates a forced circulation gas oven according to the present invention.

This gas oven 10 includes a container body 11 and a door 12 rotatably attached to the front surface of the container body 11. On the front surface of the container body 11, there is a temperature control operation knob 13 and a gas cock opening/closing operation knob 14. , and a timer 15 are provided.

As shown in FIG. 2, the inside of the oven 10 includes a combustion chamber 21 that communicates with the atmosphere through an air intake port 111 on the lower surface and houses a main burner 30, and a combustion chamber 21 that communicates with the combustion chamber 21 and is connected to an air blower 31 and an electric heater. an intake chamber 22 in which a device 32 is disposed;
The main burner 3
0 hot air is sucked into the intake chamber 22 by the drive of the blower 31, and passes through an air passage (not shown) to the side opening 1 of the heating chamber 23.
13 to 113 are guided to the heating chamber 23.

The guided hot air is sucked into the intake chamber 22 by the blower 31 together with the hot air from the main burner 30 and circulates inside the heating chamber 23 as shown by the arrow in the figure. It is designed to be ejected.

As shown in FIG. 3, the temperature control knob 13 is used to arbitrarily control the temperature setting value of a thermostat 33 provided as a temperature regulator between a low temperature range of 30 to 50°C and a high temperature range of 70 to 300°C. This thermostat 33
A solenoid 5 closes when the temperature inside the heating chamber 23 is below a set temperature, opens when the temperature is above the set temperature, and opens and closes the electric heater 32 or a second solenoid valve 62 to be described later.
By energizing the heating chamber 9 and cutting off the energization, the temperature inside the heating chamber 23 can be adjusted to any temperature within the above-mentioned range.

In addition, the operation of the temperature control knob 13 controls the first switch 40 that opens and closes the electric circuit that controls the electric heater 32 as a heat source for a low temperature region, and the main burner 30 as a heat source for a high temperature region. It is configured to open and close a second switch 50 that opens and closes an electric circuit that controls the gas supply circuit, and operates the temperature control knob 13 to set the thermostat 33 to a low temperature range (for example, 30 to 50℃).
The first switch 40 closes when the temperature is set to an arbitrary temperature of
When the temperature is set to an arbitrary temperature, the second switch 50 closes.

The gas cock opening/closing operation knob 14 opens and closes the gas cock 0 that supplies gas to the gas supply circuit. When the gas cock opening/closing operating knob 14 is rotated, the gas cock opening/closing knob 14 opens and simultaneously closes the drive switch 55 of the blower 31. The ignition switch 51 is configured so that when the operation knob 14 is pressed, the ignition switch 51 closes, and when the operation knob 14 is released, the ignition switch 51 opens.

In addition, in FIG. 3, the reference numeral 41 indicates the first changeover switch 5.
3. Relays that switch and operate the second changeover switch 54 and the third changeover switch 56, respectively; numerals 52 and 57 are door switches that are switched by opening and closing the door 12; numeral 1;
6 indicates a flame detection safety device.

Further, reference numeral 61 indicates a first electromagnetic valve that opens and closes by the operation of the solenoid 58, and reference numeral 62 indicates a second electrode valve that opens and closes by the operation of the solenoid 59.

When the forced circulation gas oven 10 configured as described above is used for low-temperature cooking, for example as a baking sheet, first the temperature control knob 13 is operated to set the thermostat 33 at 35°C.

Then, in conjunction with this operation, the first switch 40 closes and the relay 41 is energized.
The changeover switch 53, the second changeover switch 54, and the third changeover switch 56 are each switched to the contact a side.

Therefore, when the timer 15 is set to a predetermined time, the timer switch closes and the electric heater 32 is energized, and the oven 1
0 exhibits the foil function for a predetermined period of time, and after the predetermined time has elapsed, the timer switch opens, the power to the electric heater 32 is cut off, and the foil function is stopped.

In addition, while the roasting function is being performed, the low temperature cooking lamp 7
0 is lit, and the cooking lamp 71 is set to the thermostat 33.
Flashes when activated.

Next, if the oven 10 is to be used for high-temperature cooking, for example, as a bread maker, the temperature control knob 13 is turned on.
Operate to set the thermostat 33 to 200°C.

Then, in conjunction with this operation, the first switch 40 opens and the second switch 50 closes, and at the same time, the relay 41 becomes inactive, and the first changeover switch 53, second changeover switch 54, and third changeover switch 56 respectively When the door 12 of the oven 10 is opened in this state,
The door switches 52 and 57 are switched to the contact a side, and the internal lamp 72 is turned on.

Next, when the gas cock opening/closing operation knob 14 is rotated, the gas cock black 0 opens and at the same time the drive switch 55 of the blower 31 is closed, and when the gas cock opening/closing operation knob 14 is pressed, the ignition switch 51 is closed.

Therefore, the energized solenoid 58 operates to open the first solenoid valve 61 of the gas supply circuit, and the pilot burner 34
Igniter 7 supplied with gas and energized
3 is discharged and the pilot burner 34 is ignited.

When the ignition of the pilot burner 34 is confirmed by the flame rod 74, the flame detection safety device 16 is activated by the signal.
The internal relay moves to the left in the figure, the igniter 73 becomes inactive, and the pilot lamp 75 lights up.

In the second state, the gas cock opening/closing operation knob 14
Even if the pressure of
is kept open.

Finally, when the door 12 of the oven 10 is closed, the door switches 52 and 57 are switched to the contact side, and the timer 15 is set to a predetermined time, which turns on the cooking lamp 71 and turns on the energized solenoid 59. second by actuation
The solenoid valve 62 opens and the main burner 30 is ignited, and at the same time the blower 31 is driven and the oven 10 performs its oven function for a predetermined period of time.

After a predetermined period of time, the timer switch opens and solenoid 59
The second solenoid valve 62 is closed, and the gas supply to the main burner 30 is thereby cut off, stopping its oven function.

By the way, if you wish to use the oven 10 used as described above as a baking tray, without operating the gas cock opening/closing operation knob 14, the temperature adjustment operation knob 13 is closed while the drive switch 55 of the blower 31 is closed.
Set the thermostat 33 to 35°C by operating the

Then, in conjunction with this operation, the second switch 50 opens and closes the first solenoid valve 61, the gas supply to the pilot burner 34 is cut off, the first switch 40 closes, and the relay 41 closes.
is energized.

As a result, the first changeover switch 53 and the second changeover switch 5
The fourth and third changeover switches 56 are respectively switched to the contact a side, and the electric heater 32 is in a state where it can be energized.

In this state, if you set the timer 15 to an arbitrary time,
The low-temperature cooking lamp 70 lights up, and the blower 31 is driven to actively discharge the hot air inside the heating chamber 23, thereby quickly lowering the temperature inside the heating chamber 23 to the set temperature.

When the temperature inside the heating chamber 23 drops to the set temperature, the thermostat 33 closes and the electric heater 32 is energized, and at the same time, the cooking lamp 71 is energized.

As a result, the cooking lamp 71 lights up, thereby confirming that the temperature inside the heating chamber 23 has dropped to the set temperature.

At this point, when the gas cock opening/closing operation knob 14 is rotated to close the gas cock black 0, the drive switch 55 opens in conjunction with this operation, the blower 31 stops driving, and the oven 10 performs the heating function. It becomes possible to do so.

In addition, in this embodiment, the drive of the blower 31 is configured to be switched between two high and low levels using a changeover switch 80 depending on the type of cooking, and an internal lamp switch 81 is provided to turn on or off the heating chamber if necessary. It is now possible to monitor the cooking status inside 23.

In summary, in the present invention, as exemplified in the above embodiment, when performing low-temperature cooking following high-temperature cooking, the drive switch 55 of the blower 31, which is opened and closed in conjunction with the operation of the gas cock opening/closing control knob 14, is closed. Since the configuration is such that the hot air inside the heating chamber 23 can be actively discharged by driving the blower 31 while the temperature is still high, the temperature inside the heating chamber 23 can be quickly lowered to the low-temperature cooking temperature. Compared to conventional ovens, it does not require wasted time when transitioning from high-temperature cooking to low-temperature cooking.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an oven showing an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional side view of the central part of FIG. 1, and FIG. 3 is a schematic diagram showing its electric circuit and gas supply circuit. Explanation of symbols 10... Oven, 13...
・・Temperature adjustment operation knob, 14 ・・・Gas cock opening/closing operation knob, 23 ・・・Heating cabinet, 30・
...Main burner, 31 ...Blower, 3
2... Electric heater, 33... Thermostat, 40... First switch, 50...
Second switch, 55...Blower drive switch, 60...Gas cock.

Claims (1)

[Scope of utility model registration request] A first switch 40 opens and closes an electric circuit that controls energization of the electric heater 32 as a heat source for a low temperature region, and an electric circuit that controls gas flowing through a gas supply circuit to the gas burner 30 as a heat source for a high temperature region. The second switch 50 is linked with the temperature adjustment operation knob 13 of the temperature regulator 33 which can set an arbitrary cooking temperature in each of the temperature ranges, and both the switches are selected by operating the operation knob 13. A switch 55 for driving the blower 31, which opens and closes in conjunction with the operation of the gas cock opening/closing/operating knob 14 of the gas cock 0 for supplying gas to the gas supply circuit, is interposed in both the electric circuits. Then, when the second switch is closed, or when the second switch is opened and the first switch is closed, the drive switch 55 is opened by operating the gas cock opening/closing operation knob 14.
A forced circulation gas oven in which the air blower can be driven by closing the air blower.