JPS6348075Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a preheating completion notification circuit for a heating appliance equipped with a temperature regulator, such as a cooker. As a conventional circuit of this type, when the temperature is adjusted to a set temperature, the temperature is turned ON to drive a heating device (heater), and when the actual preheating temperature reaches the set temperature or higher by driving the heating device, the temperature is turned OFF. A controller (thermostat) and an alarm (buzzer) that is driven by the OFF operation of the temperature controller
(See Japanese Patent Publication No. 51-56507).

According to this, when the thermostat turns OFF, the heater is immediately stopped and a buzzer sounds, which notifies the completion of preheating, but after the heater stops, the actual preheating temperature is lower than the set temperature. The buzzer disappears in a relatively short period of time due to the drop in temperature, so if you miss this sound, the buzzer will sound again until the actual heating temperature returns to the set temperature or higher by subsequent heater drive. , it is not possible to know when preheating is complete, and electrical energy is wasted by the heater for a relatively long period of time.

The purpose of the present invention is to provide a circuit that eliminates the inconveniences of the conventional circuits described above, and turns on when the temperature is adjusted to a set temperature.
When the actual preheating temperature reaches the set temperature or more by driving the heating device 1 and driving the heating device 1.
A temperature regulator 2 that operates OFF, and the temperature regulator 2
A self-holding relay 5 that is energized and energized via a contact 4 that is closed when the temperature regulator 2 is turned OFF to drive the alarm 3. The temperature regulator 2 is composed of a thermostat,
4 in FIG. 1 indicates the contact point. The temperature control knob (not shown) of the thermostat can be operated between a stop position and a temperature set position, and is operated to the stop position before the start of preheating and after the completion of preheating, and the contact 4 of the thermostat is set to the first position. The upper side in the figure, that is, the first
It was arranged to be on the side that comes into contact with the fixed contact 6.

The heating device 1 is composed of a gas oven burner, and is controlled by a combustion control device indicated by 7 in FIG.
Its combustion was controlled. The combustion control device 7 is connected to a power source via a contact 4 of the thermostat, a first contact 13 of a timer 12 (described later), and a start switch 8.

Note that the heating device 1 is not limited to the burner described above, and may be a heater, for example, and in this case, the combustion control device 7 is not necessary, and a heater may be connected instead.

The alarm 3 is composed of a buzzer, and is connected to a power source via a normally open contact 9 of a relay 5, a first contact 13 of a timer 12, which will be described later, and a start switch 8.

Note that the alarm 3 is not limited to a buzzer, and may be any means that can notify, such as a display lamp.
The energizing circuit 10 of the relay 5 includes a timer 12, which will be described later.
The energizing circuit 10 is connected to the power source via the thermostat contact 4, the first contact 13 of the timer 12, which will be described later, and the start switch 8. Reference numeral 11 in FIG. 1 indicates a self-holding contact of the relay 5, which is connected in parallel to the contact 4 which is closed when the thermostat is turned off.

Reference numeral 12 in FIG. 1 indicates a timer, and its operation knob (not shown) can be operated to the adjustment heating time set position, preheating position, continuous cooking heating set position, and stop position, and the desired cooking heating time can be set. Ba,
The first timer contact 13 and the second timer contact 14 are closed to operate the timer 12 during the desired cooking heating time, and when the preheat position is set, the first timer contact 13 and the third timer contact 15 are closed. When the continuous cooking heating set position is set, the first
Only the timer contact 13 is closed. In Fig. 1, 16 indicates a fan inside the oven, and 17
indicates the second fixed contact of the thermostat.

Next, the operation will be explained. First, when the temperature control knob of the thermostat constituting the temperature controller 5 is set to the desired set temperature, the thermostat is turned ON and its contact 4 is connected to the second fixed contact 17.
switch to the side that comes into contact with.

Next, when the operation knob of the timer 12 is set to the preheating position, the first contact 13 and the third contact 15 are closed, and the preheating preparation is completed. After completion of preparation, when the start switch 8 is closed, the combustion control device 7 is activated, the burner constituting the heating appliance 1 is ignited, and preheating of the inside of the oven is started. After preheating starts, when the actual preheating temperature inside the oven reaches the desired set temperature, the thermostat turns OFF and its contact 4
contacts the first fixed contact 6 again, the relay 5 is energized, its contact 9 is closed, and the buzzer constituting the alarm 3 is sounded. This sounding is continued by the relay 5 being self-held by closing its contact 11, so the notification of the completion of preheating will not be missed, and the cooking heating can be started immediately thereafter.

In this way, according to the present invention, the temperature controller 2
Since a self-holding type relay 5 is provided which is energized and energized to drive the alarm 3 through the contact 4 which is closed when the alarm is turned off, the alarm 3 which is driven when the preheating is completed can be continuously driven thereafter. I can do it,
Therefore, it is possible to immediately proceed to the next heating process without failing to detect the completion of preheating, and it is possible to proceed to the next heating process operation without failing to detect the completion of preheating. This has the effect of reliably eliminating the inconvenience of wasting electrical energy.

[Brief explanation of the drawing]

The drawing is a circuit diagram of an embodiment of the present invention. 1... Heating device, 2... Temperature controller, 3... Alarm, 4... Contact, 5... Relay.

Claims (1)

[Scope of utility model registration request] A temperature regulator 2 that turns ON to drive the heating device 1 by adjusting the temperature to a set temperature, and turns OFF when the actual preheating temperature reaches the set temperature or more by driving the heating device 1; and an alarm 3 that is driven by the OFF operation of the temperature controller 2, when the temperature controller 2 is OFF.
A self-holding relay 5 that is energized and energized via a contact 4 that is closed when activated to drive the alarm 3.
A preheating completion notification circuit characterized by being provided with.