KR20020021953A - Safity Device from Firing by Damper - Google Patents

Abstract

PURPOSE: A fire safety device for a microwave oven is provided to prevent the outburst of flame and heat toward the outside of the microwave oven by intercepting the flame and heat caused by overcooking. CONSTITUTION: In a fire safety device for a microwave oven, an exhaust damper(16) intercepts the outburst of flame and heat generated within a cooking chamber(2). A driving unit opens/shutters the exhaust damper. A controller controls the driving unit. A thermostat(6) senses the temperature of the cooking chamber. The driving unit is composed of a motor(10), a cam(12) and a rod(14). The cam and rod transmits the power of the motor to the exhaust damper. The controller is composed of a relay(8) and a microcomputer(4) switching on the relay when firing.

Description

Fire safety device using damper {Safity Device from Firing by Damper}

The present invention relates to a microwave oven, and more particularly, to a fire safety device using a damper for preventing the occurrence of fire due to overcooking of the cooking chamber by installing a damper in the exhaust port of the microwave oven.

In a microwave oven, a magnetron (not shown) oscillates by supplying a high voltage of 4000V or more by boosting a high voltage transformer (not shown), and a microwave output is generated from an antenna (not shown) of the magnetron.

A microwave oven is a cooking utensil for heating and cooking food using the microwave as a heat source.

When cooking food in a cooking chamber (not shown) by the microwave oven, the magnetron may be operated for a large amount of time more than necessary for heating the food, causing food to be overcooked.

When the food in the microwave cooking room is overcooked as described above, energy (more than energy proportional to the square of the amplitude of the microwave) that the food itself can consume is irradiated to the food, so the food is burned and burned. Leads to.

In addition, when a fire in the cooking chamber occurs due to excessive cooking of food in the cooking chamber, flames and heat are ejected out of the microwave oven, and there is a risk of fire not only in the loss of the microwave itself but also in the environment of the user and the microwave oven.

Next, a look at the prior art for preventing the occurrence of fire due to overcooking of food in the microwave cooking chamber as described above.

The microwave oven has a thermostat (not shown) that is open when a temperature above a reference temperature is sensed as a temperature sensor. The magnetron, which is a heating source of the microwave oven, is configured to be driven by receiving a voltage supplied through the thermostat.

When a fire occurs in the food due to excessive cooking of the food in the microwave cooking chamber, the temperature of the cooking chamber rises rapidly and the thermostat detects a temperature higher than the set temperature and is opened.

When the thermostat is opened as described above, the current supplied to the magnetron from the external power source is cut off and the operation of the magnetron is stopped. Then, the operation of the magnetron is stopped, the output of the microwave heating the food of the cooking chamber is cut off so that the food is no longer heated.

However, the following problems arise in the prior art as described above.

Even if the fire occurs due to excessive cooking of the food in the cooking chamber and the thermostat is opened due to the increase in the temperature inside the cooking chamber, this stops the operation of the magnetron and the cooking chamber fire is maintained for a certain time.

In addition, the flame and heat caused by the fire of the cooking chamber as described above is emitted to the outside of the microwave oven is a problem that causes a fire around the outside of the microwave oven.

An object of the present invention is to provide a microwave oven having a structure that blocks the flame and heat caused by the fire caused by excessive cooking of food in the cooking chamber of the microwave to be discharged to the outside of the microwave oven.

It is still another object of the present invention to provide a microwave oven having a structure in which the fire inside the cooking chamber caused by excessive cooking of food in the microwave cooking chamber is extinguished early.

1 is an explanatory view showing the configuration and operation of the fire safety device according to the present invention.

Figure 2 is a flow chart showing the operation of the control method of the fire safety device according to the present invention.

Explanation of symbols on the main parts of the drawings

2 ...... Cavity 4 ...... Microcomputer

6 ...... Thermistor 8 ...... Relay

10 ...... Damper Motor 12 ...... Cam

14 ...... Connecting Rod 16 ...... Exhaust Damper

18 ...... Air vent

Microwave cooking chamber fire safety device according to the present invention for achieving the above object,

Exhaust damper to block the flame and heat generated from inside the microwave cooking chamber to the outside of the microwave oven,

Driving means for opening and closing the exhaust damper

A control unit for controlling the driving means,

Characterized in that the thermistor for detecting the temperature of the microwave cooking chamber to be the control means of the control unit.

The driving means for opening and closing the exhaust damper is characterized by comprising a motor as a drive source and a cam and a rod as a power transmission means for transmitting the power of the motor to the exhaust daffer.

The control unit for controlling the drive means is characterized in that the relay and a microcomputer to switch on the relay in the event of a microwave fire.

According to the configuration as described above, it is possible to block the flame and heat caused by the fire in the cooking chamber to the outside of the microwave oven. The control method of the microwave cooking chamber fire safety device according to the present invention,

A first step of detecting a temperature T inside the microwave cooking chamber,

A second step of heating food in the cooking chamber by microwave microwave,

Comparing the temperature T inside the cooking chamber detected in the first step with the reference set temperature T1 and returning to the second step if the detection temperature T inside the cooking chamber is not greater than the reference set temperature. 3 steps,

And a fourth step of closing the exhaust damper when the detection temperature T inside the cooking chamber is greater than the reference set temperature in the third step.

Next, the present invention will be described in more detail with reference to the accompanying drawings.

1 is an explanatory view showing a microwave cooking chamber safety device according to the present invention.

According to this embodiment, the thermistor 6 whose resistance changes in accordance with the internal temperature change of the microwave cooking chamber 2 is provided in the upper part inside the cooking chamber 2. A microcomputer 4 which calculates the present temperature of the cooking chamber according to the resistance of the thermistor 6 is connected to the thermistor 6.

Under the control of the microcomputer 4, a drive relay 8, which is switched on when a fire occurs in the cooking chamber 2, is connected to the microcomputer 4.

The damper motor 10, which is a driving source of the exhaust damper 16, is connected to the relay 8 by the control of the driving relay 8. In addition, a cam 12 and a connecting rod 14, which transmits power of the damper motor 10 to the exhaust damper 16, are connected between the damper motor 10 and the exhaust damper 16. .

The following describes the operation process by the configuration of the embodiment of the present invention as described above in detail.

By microwave oscillation of the magnetron (not shown), microwaves start cooking while heating the food 3 in the cooking chamber 2.

When the microwave microwave heats the food beyond the proper cooking of the food 3, the food becomes excessively overcooking and the food starts to burn and a fire occurs.

As described above, when overcooking occurs, when a fire occurs in the cooking chamber 2, the flame and heat are blown out through the exhaust port 18, while the temperature inside the cooking chamber 2 increases.

Meanwhile, the process of detecting the present temperature T of the cooking chamber by the microcomputer 4 is as follows.

As described above, when the temperature inside the cooking chamber 2 changes, the resistance value of the thermistor 6 installed above the inside of the cooking chamber 2 changes. Then, the voltage (not shown) determined by the resistance value of the thermistor 6 changes as the resistance value changes, and this voltage value is input to the microcomputer 4. The microcomputer 4 then calculates the temperature T of the current cooking chamber by comparing the input voltage with the reference voltage. Here, the reference voltage is a voltage input to the microcomputer 4 in response to the fire occurrence temperature of the cooking chamber 2.

The microcomputer 4 drives the relay 8 when the temperature T inside the cooking chamber 2 is higher than the reference set temperature T1, that is, when a fire occurs in the cooking chamber. Let's do it. Here, the reference set temperature (T1) is the fire occurrence temperature inside the cooking chamber.

The damper motor 10 is turned on by the relay 8 and the motor rotates. When the damper motor 10 rotates, the cam 12 located below the daffer motor 10 rotates integrally with the damper motor 10.

As the cam 12 rotates, the connecting rod 14 connected to the cam 12 performs a linear movement as shown in FIG.

As the exhaust damper 16 connected to the connecting rod 14 moves linearly toward the exhaust port 18 as described above, the exhaust port 18 is closed by the exhaust damper 16.

When the exhaust port 18 is closed by the exhaust damper 16 as described above, the flame and heat inside the cooking chamber 2 are not ejected to the outside of the microwave oven, and the oxygen supply to the interior of the cooking chamber 2 is stopped. The fire inside is extinguished soon.

Next, a control method of a fire safety device inside a microwave cooking chamber according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a flowchart illustrating a control method of a fire safety device inside a microwave cooking chamber.

First, when the microwave (M / W) mode is selected, the magnetron operates and the microwave output is generated (step 103).

The internal temperature of the cooking chamber 2 detected by the thermistor 6 is designated as T, and the reference set temperature is designated as T1 (step 105).

In step 103, the temperature of the cooking chamber 2 increases, and accordingly, the temperature of the thermistor 6 increases (step 107).

Compares the current cooking chamber temperature T with the reference set temperature T1 and returns to step 107 when the cooking chamber temperature T is smaller than the reference set temperature T1, and if not, proceeds to the next step. (Step 109).

If the current cooking chamber temperature T is greater than the reference set temperature T1 in step 109, the magnetron is stopped and the damper motor 10 is driven to close the exhaust damper 16 (step 111). .

As a result of step 111, the flame and heat inside the cooking chamber 2 are not blown out of the microwave oven, and the fire is extinguished (step 113).

In the above description, the present invention has been described using a microwave as a heating source by way of example, but is not limited to the microwave.

The above embodiments of the present invention are merely one embodiment of the technical idea of the present invention, and of course, other modifications are possible within the technical idea of the present invention.

According to the configuration of the present invention as described above the following effects are expected.

By closing the exhaust vent of the microwave oven, it is possible to prevent the flame and heat generated by the overcooking of food inside the cooking chamber from being blown out of the microwave oven.

As a result of the above, the effect of preventing the burn of the microwave user and the fire of the environment outside the microwave is expected.

In addition, since the supply of oxygen to the inside of the cooking chamber is stopped by the exhaust damper closing the microwave exhaust port, a fire in the cooking chamber is soon expected to be suppressed.

Claims (5)

An exhaust damper for preventing a fire generated inside the microwave cooking chamber from being blown out of the microwave oven; Drive means for opening and closing the exhaust damper; A thermistor for detecting a microwave cooking chamber temperature; A control unit controlling the driving means based on the sensed temperature of the thermistor; Microwave cooking chamber fire safety device, characterized in that consisting of. 2. The apparatus of claim 1, wherein the driving means for opening and closing the exhaust damper comprises: a motor serving as a driving source; Power transmission means for transmitting the power of the motor to the exhaust daffer; Microwave cooking chamber fire safety device, characterized in that consisting of. 3. The power transmission apparatus of claim 2, wherein the power transmission unit comprises: a cam coupled to the damper motor to convert the rotational motion of the damper motor into a linear motion; A connecting rod connected between the cam and the exhaust damper to transfer movement of the cam to the exhaust damper; Microwave cooking chamber fire safety device, characterized in that configured. The apparatus of claim 1, wherein the controller comprises: a relay configured to open and close a power supply of the motor; A microcomputer that switches on the relay in the event of a microwave fire; Microwave cooking chamber fire safety device, characterized in that configured. Detecting a temperature T inside the microwave cooking chamber; A second step of heating food in the cooking chamber by a microwave microwave; Comparing the temperature T inside the cooking chamber detected in the first step with the reference set temperature T1 and returning to the second step if the detection temperature T inside the cooking chamber is not greater than the reference set temperature. Three steps; A fourth step of closing the exhaust damper when the detected temperature T in the cooking chamber is greater than the reference set temperature in the third step; Control method of the microwave cooking chamber fire safety device comprising a.