JPS6110081Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to the improvement of microwave ovens.

A conventional microwave oven is constructed as shown in FIGS. 1 to 3.

1 is a heating chamber formed inside an exterior (not shown); 2 is a door for opening and closing the front opening of the heating chamber 1; 3 is a hot air heating device fixed to the ceiling wall 4 of the heating chamber 1; 5 is a hot air heating device fixed to the ceiling wall 4 of the heating chamber 1; The duct of the hot air heating device, 6 and 7 are the inlet and outlet ports of the duct 5, 8 and 9 are radio wave shielding punching plates stretched over the inlet port 6 and the outlet port 7, respectively, and 10 is the duct 5. The hot air circulation fan 11 is a heater device for generating hot air by exchanging heat with the air passing through the duct 5, and the hot air fan 12 is placed at the rear of the duct 5 and functions to switch the hot air discharge direction. It is a deflector. A rotation shaft 13 is fixed to the back wall of the hot air deflection body 12, and the hot air deflection body 12 is configured to be rotatable by a predetermined angle around the rotation shaft 13. In addition, the hot air deflector 12 is configured to switch the hot air discharge direction in response to oven heating and grill heating, which will be described later. It can be switched so that it is oriented toward the side portions, and conversely, when the grill is being heated, it is oriented toward the center portion of the heating chamber 1 as shown by the dotted line in FIG.

14 is a metal fitting for rotatably supporting the rotating shaft 13, 15 is a rotating lever that is fixed to the rotating shaft 13 and rotates integrally with the rotating shaft 13, and 16 is a metal fitting that supports the rotating shaft 13 at all times. The hot air deflector 1 is tensilely biased in the direction of
A spring 17, which holds 2 in its oven heating position, is associated with the pivot lever 13, and when operated, pulls the pivot shaft 13 in the other direction against the force of the spring 16, causing it to pivot, thereby deflecting the hot air. The biasing means for holding body 12 in its grill heating position is specifically a solenoid.

18 is fixed to the ceiling wall 4 of the heating chamber 1;
magnetron for supplying high frequency radio waves to
9 is a turntable that is placed in the center of the heating chamber 1 and functions to uniformly heat the object to be heated; 20 is a geared motor for driving the turntable; 21 is a turntable on which a turntable 19 is detachably supported. It is a power transmission shaft.

22 is a radio wave shielding punching plate which functions to exhaust the heating chamber atmosphere through it, 23 is an exhaust duct, and 24 is a temperature detection element that detects the temperature of the heating chamber atmosphere exhausted through the punched hole.

Specifically, the temperature detection element 24 is composed of a bimetallic thermostat, and the opening/closing contact portion of this bimetallic thermostat is represented as a thermoswitch 25 in an electric circuit to be described later. And bimetallic thermostat 24
has a temperature setting mechanism (not shown), and the operating temperature is set in conjunction with the temperature setting operation body 26 by operating a temperature setting operation body 26, which will be described later.

Here, the temperature setting operation body 26 and the temperature setting mechanism set the operating temperature of the temperature detection element 24 extremely high when the temperature setting operation body 26 is set to its maximum temperature setting position, and the thermoswitch 25 is continuously closed. It is designed to achieve this goal. 27 is an operation panel section where the temperature setting operation body 26 etc. are arranged;
28 is a cooking button, 29 is a high-frequency heating timer knob for setting the operating time of the magnetron 18, 30 is a heater timer knob for setting the operating time of the hot air heating device 3, and 31 is for switching the hot air deflector 12. This is an oven-grill switching operation body for Specifically, the oven-grill switching operation body 31 is composed of an oven push button and a grill push button, and when one of both push buttons is pressed, the other one automatically returns to its original state.
The oven-grill switching operation body 31 is connected to the solenoid 17 as described later.
The hot air deflection body 12 is switched via 7.

In Figure 4, 32 is a power plug, 33 and 3
4 is one main electric wire and the other main electric wire, 35 is a door switch, 36 is a cooking start switch linked with the cooking button 28, and 37 is a high frequency heating timer set by the high frequency heating timer knob 29. . The high frequency heating timer 37 is
It is formed by a first contact 38, a second contact 39, and a timer motor 40, and when the timer is set, both the first contact 38 and the second contact 39 switch to the normally open contact no, and the timer motor 40 operates. That's what happens. The high frequency timer 37 connects contacts 38 and 3 to the geared motor 20 for driving the turntable during high frequency heating and hot air heating.
9 is switched to the NO side or the NE side, and thus functions to conduct electricity during both heating operations.

Reference numeral 41 denotes a high-frequency heating means to which power is supplied through the first contact 38 when the high-frequency heating timer 37 is set.

The high-frequency heating means 41 includes a step-up transformer 42, a high-voltage capacitor 43 and a diode 44 connected to the secondary side of the step-up transformer 42, and DC high voltages generated by these elements 42, 43, and 44 are applied. The magnetron 18 is formed by high-frequency oscillation.

45 is the heater heating timer knob 30
This is a timer for heating the heater, which is set by operating the .

The heater heating timer 45 includes a normally open contact 46 and a timer motor 47, and the normally open contact 46 has a normally closed contact of the first contact 38.
It becomes connected to no.

Reference numeral 48 denotes an oven-grill changeover switch, which is interlocked with the oven-grill changeover operation body 31, and is opened when the changeover operation body 31 is switched to the oven side, deenergizing the solenoid 17 and switching off the hot air deflector 12.
When the switching operation body 31 is switched to the grill side, the solenoid 17 is closed and the hot air deflector 12 is switched to the grill heating position. Further, the fan motor 49 of the hot air circulation fan 10, the thermoswitch 25, and the heater device 11 are connected to the rear stage of the contact 46 of the heater timer.

In the above conventional example, during high frequency heating, the high frequency heating timer 37 is set and power is supplied to the high frequency heating means 41 through the normally open contact no of the first contact 38 to perform high frequency heating.

When heating the oven, set the high frequency heating timer 3.
7 to the return position, the heater heating timer 45 is set, and power is supplied to the heater device 11 through the first contact 38 and the heater timer contact 46, and the temperature setting operation body 26 is set to the heater device 11. Adjust the power supply.

When heating the grill, the oven-grill switching operation body 31 is further switched to the grill side and the temperature setting operation body 26 is set to its maximum temperature setting position to perform grill heating.

However, in the above-mentioned oven range, when switching from oven heating to grill heating, the oven-grill switching operation body 31 and the temperature setting operation body 26 must be operated, which is cumbersome to operate, and the temperature setting operation body 26 must be operated. If you forget to set the temperature to its maximum temperature setting, the thermo switch 2
There was an inconvenience that 5 was activated and hot air for browning could not be obtained.

This invention was made in view of this point, and only the essential parts of one embodiment will be explained below.

Incidentally, in this embodiment, other parts are constructed in the same manner as in the above-mentioned conventional example.

The feature of this embodiment is that, as shown in FIGS. 5 to 7, the oven-grill switching operation body 31 in the conventional example is omitted, and the function of this switching operation body 31 is replaced by a temperature setting operation body 26. That's what happens.

Specifically, the rotation shaft 50 of the temperature setting operation body 26
A cam 51 is pivotally attached to the cam 51, and the oven-grill changeover switch 48 is biased by the cam 51.
The cam 51 is configured to energize the oven-grill changeover switch 48 just when the temperature setting operating body 26 is set to its maximum temperature setting position. Therefore, in this embodiment, the temperature setting operation body 26 alone is used to set the heating chamber ambient temperature and the hot air deflection body 12.
Both positions can be set.

Since this device is configured as described above, when switching from oven heating to grill heating, simply set the temperature setting operation body to its maximum temperature setting position.
Continuous energization of the hot air heating device and switching of the hot air deflection body can be carried out at the same time, and there is less risk of making a mistake in the switching operation compared to the conventional example in which two operating bodies are operated. Become.

[Brief explanation of the drawing]

1 to 4 show a conventional example, FIGS. 1 and 2 are partial cross-sectional views, FIG. 3 is a partial perspective view,
FIG. 4 is an electric circuit diagram, FIGS. 5 to 7 show an embodiment of this invention, FIGS. 5 and 6 are perspective views of essential parts, and FIG. 7 is a control system diagram. 3... Hot air heating device, 11... Heater device of the hot air heating device, 12... Hot air deflector, 17... Urging means (solenoid), 25... Thermoswitch, 26... Temperature setting operation body.

Claims (1)

[Scope of utility model registration request] A hot air heating device that supplies hot air to the heating chamber by being powered through a thermoswitch that operates according to the ambient temperature of the heating chamber, and a hot air heating device that is installed at the rear of the hot air heating device and is compatible with oven heating and grill heating. A hot air deflector configured to switch the hot air discharge direction, a biasing means for switching and operating the hot air deflector, and a temperature setting operation member for adjusting the operating temperature of the thermoswitch, When the temperature setting operating body is set to its maximum temperature setting position,
A microwave oven characterized in that the biasing means is switched in conjunction with the temperature setting operation body to thereby set the hot air deflection body to its grill heating position.