KR20040012334A - Temperature sensing structure for microwave oven - Google Patents

Abstract

PURPOSE: A thermostat structure is provided to rapidly detect the fire outbreak caused due to the excessive cooking operation performed in the cavity of microwave oven. CONSTITUTION: A thermostat structure comprises a thermostat(28) for sensing the temperature of a cavity(22) and providing information for operation of a microwave oven; a porous unit(40) having a plurality of through holes(41) for rapidly transferring the temperature of the cavity to the thermostat; and a combustible cover(42) for opening/closing the through holes of the porous unit, wherein the combustible cover melts by the heat generated from the cavity such that the condition of the cavity is transmitted to the thermostat through the porous unit.

Description

Temperature sensing structure for microwave oven {Temperature sensing structure for microwave oven}

The present invention relates to a microwave oven, and more particularly, to a temperature sensing structure for a microwave oven that can detect the fire more quickly in the event of a fire to prevent the risk in advance.

A microwave oven is a cooking apparatus that uses a magnetron or a heater as a heating source and electrically drives the heating source to perform cooking. As with most electronic devices, electricity-based electronic devices offer convenience and efficiency in real life, but they are also exposed to very high risks such as fire and electric shock. Therefore, electronic devices using electricity should place a large weight on safety before providing convenience, and this has a great effect on reliability and purchasing power of products.

On the other hand, when cooking food in a microwave oven, the heating source is operated for many times more than necessary for food heating, the food is excessively cooked occurs. When the food in the microwave cooking room is excessively cooked as described above, the energy is irradiated to the food because energy is more than the food itself can consume, leading to a fire as the food burns.

Next, look at in detail the conventional technology for preventing the fire caused by excessive cooking of food in the microwave cooking chamber as described above.

As shown in FIG. 1, a cooking chamber 2 is provided inside the cavity assembly 1 in which cooking is performed while heating microwaves, and the cooking chamber 2 is opened and closed by a door 4. It is configured to be.

On the one side (right side in the drawing) of the cooking chamber 2, an electrical equipment chamber 10 in which various electronic components for generating microwaves is provided is provided, and the electrical equipment chamber 10 is formed by an external casing 6. It is configured to be shielded. The magnetron 12 for oscillating a microwave is provided in the inside of the electric compartment 10.

The upper surface of the cavity assembly 1 adjacent to the electric compartment 10 is provided with a thermostat 8 for sensing the internal temperature of the cooking chamber 2 as a temperature sensor. In the prior art as described above, the temperature sensing unit 8 senses the temperature of food and the like and provides information for the progress of cooking.

On the other hand, if a fire occurs in the food due to excessive cooking of the food in the microwave cooking chamber 2, the temperature of the cooking chamber 2 rises rapidly and the temperature sensing unit 8 senses the temperature inside the cooking chamber 2 To the control unit. As described above, no further operation is performed by the signal sensed by the temperature sensing unit 8 and transmitted to the control unit so that the food is not heated further.

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

Since the temperature sensing unit 8 is installed on the upper surface of the metal cavity assembly 1, even if a fire occurs due to excessive cooking of food in the cooking chamber 2, the cavity assembly 1 is primarily heated. Only after this, heat is transmitted to the temperature sensing unit 8 due to fire. Therefore, in the conventional structure, there is a problem that the temperature detecting unit 8 cannot quickly detect the fire in the cooking chamber 2.

Therefore, the present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to enable a faster detection of the fire inside the cavity generated in the cooking chamber.

1 is an exploded perspective view showing the internal structure of a microwave oven having a temperature sensing structure according to the prior art.

Figure 2 is an exploded perspective view showing a preferred embodiment of the temperature sensing structure for a microwave oven according to the present invention.

Figure 3 is a cross-sectional view showing a structure in which the flammable cover shields the porous portion in the embodiment of the present invention.

** Description of the symbols for the main parts of the drawings **

21: Cavity Assembly 22: Cooking Room

24: door 26: outer casing

28: temperature detection unit 30: battlefield

32: magnetron 34: high voltage transformer

36: blower fan 40: porous part

41: through hole 42: flammable cover

According to a feature of the present invention for achieving the above object, the present invention includes a temperature sensing unit for sensing the temperature of the cooking chamber and providing information necessary for the operation of the microwave oven; A porous part formed by drilling a plurality of through holes so that the temperature in the cooking chamber is quickly transmitted to the temperature sensing part; And a flammable cover that shields the through hole of the porous part and is melted by the heat inside the cooking chamber when a fire occurs so that the environment inside the cooking chamber is transferred to the temperature sensing unit through the porous part.

The flammable cover is preferably formed of a material that is easily soluble in heat, such as synthetic resin.

Preferably, the through hole of the porous part is set to a diameter of 3 mm or less so as to prevent electromagnetic leakage.

According to the present invention having such a configuration, there is an advantage that it is possible to more quickly detect the fire in the cooking chamber.

Hereinafter, a preferred embodiment of a temperature sensing structure for a microwave oven according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a view showing a preferred embodiment of the microwave temperature sensing structure according to the present invention, Figure 3 is a cross-sectional view showing a cross section of the porous portion and the flammable cover constituting the embodiment of the present invention. As shown in these drawings, a cooking chamber 22 is provided inside the cavity assembly 21 in which microwaves are supplied to cook foods by heating food, and the cooking chambers 22 are opened and closed by a door 24. It is configured to be.

On the one side (right side in the drawing) of the cooking chamber 22, an electrical equipment chamber 30 is provided with various electrical components for generating microwaves, and the electrical equipment chamber 30 is formed by an external casing 26. It is configured to be shielded. Inside the electric compartment 30, a magnetron 32 for oscillating microwaves, a high pressure transformer 34 for applying high pressure to the magnetron, and an air flow for cooling the electric parts and passing through the inside of the cooking chamber 22. A blowing fan 36 or the like for forming the air is provided.

Meanwhile, a temperature detector 28 is used to sense the temperature inside the cooking chamber 22 to obtain information for operating the microwave oven. The temperature sensing unit 28 is mounted on one side of the upper surface of the cavity assembly 21 corresponding to the cooking chamber 22.

The temperature sensor 28 detects the temperature inside the cooking chamber 22 to provide temperature information necessary for the progress of cooking, and when the temperature inside the cooking chamber 22 becomes a predetermined value or more, the temperature is supplied to the magnetron 32. The operation of the magnetron 32 may be stopped by cutting off the current.

The upper surface of the cavity assembly 21 is provided with a porous portion 40 consisting of a plurality of through-holes 41 in a position adjacent to the temperature sensing unit 28. When the fire occurs due to excessive cooking of the food in the cooking chamber 22, the porous part 40 quickly transmits the environment inside the cooking chamber 22, that is, the temperature of the cooking chamber, to the temperature sensing unit 28. Do it. Preferably, the through hole 41 of the porous part 40 has a diameter of 3 mm or less so as to prevent leakage of microwaves.

A flammable cover 42 is attached to the porous portion 40. The flammable cover 42 shields the through hole 41 of the porous part 40, so that the environment inside the cooking chamber 22 is not normally transmitted to the temperature sensing part 28 through the porous part 40. Do not

The flammable cover 42 normally prevents water vapor or foreign substances generated in the cooking chamber 22 from contaminating the temperature sensing unit 28, and melts at a predetermined temperature or more so that the environment of the cooking chamber 22 is porous. Through the temperature sensing unit 28 to be transmitted through.

On the other hand, the flammable cover 42 is preferably made of a synthetic resin material such as polyethylene that quickly melts at a set temperature in order to ensure that the environment inside the cooking chamber 22 is quickly transmitted to the temperature sensing unit 28 in case of fire. Do.

Hereinafter, the operation of the microwave temperature sensing structure according to the present invention having the configuration as described above will be described in detail.

In normal times, the temperature sensing unit 28 formed on the upper surface of the cavity assembly 21 senses the environment of the cooking chamber 22, that is, the temperature of the cooking chamber, and the like, based on the metal cavity assembly 21. Provide the necessary information.

However, when a fire occurs due to excessive cooking of food in the cooking chamber 22, heat due to the fire is transferred to the flammable cover 42 through the through-hole 41 of the porous part 40 to be combustible cover. 42 is melted and removed. When the flammable cover 42 is dissolved, heat is transferred to the temperature detecting part 28 through the through hole 41 of the porous part 40 formed under the flammable cover 42. The temperature sensor 28 detects heat transmitted from the porous part 40 more quickly to stop the operation of the magnetron 32 by blocking the current supplied to the magnetron 32 from an external power source.

In addition, since the operation of the magnetron 32, which is a heating source of the microwave oven, is stopped, the output of the microwave that heats the food in the cooking chamber 22 is cut off, and the food is no longer heated.

Accordingly, the flammable cover 42 maintains a function of preventing contamination of the temperature sensing unit 28 from water vapor or foreign matter in the cooking chamber 22 during normal use while being easily dissolved in the event of a fire, thereby increasing the temperature in the cooking chamber 22. By performing the function to quickly transfer to the temperature sensing unit 28 through the porous portion 40 to prevent the fire progress in the cavity 21.

In the above, the present invention has been described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and those skilled in the art belong to the present invention without departing from the gist of the present invention. Various changes and modifications can be made by the user.

As described above, according to the configuration of the present invention, the following effects can be expected.

In the event of a fire, the flammable cover covering the porous part melts and the heat generated in the cooking chamber is effectively transferred to the temperature sensing unit. Therefore, it is possible to quickly detect a fire caused by excessive cooking of food inside the cooking chamber and prevent it from proceeding any further.

Claims (3)

A temperature sensing unit which senses a temperature of the cooking chamber and provides information necessary for operation of the microwave oven; A porous part formed by drilling a plurality of through holes so that the temperature in the cooking chamber is quickly transmitted to the temperature sensing part; And a flammable cover that shields the through-holes of the porous part and is melted by heat inside the cooking chamber when the fire occurs to allow the environment inside the cooking chamber to be transferred to the temperature sensing unit through the porous part. Sensing structure. The temperature sensing structure for a microwave oven according to claim 1, wherein the flammable cover is formed of a material which is easily soluble in heat such as a synthetic resin. The temperature sensing structure for a microwave oven according to claim 1 or 2, wherein the through hole of the porous part is set to a diameter of 3 mm or less to prevent electromagnetic leakage.