KR100233441B1 - Apparatus for protecting the temperature sensor of a microwave oven - Google Patents

Abstract

The present invention relates to a temperature sensor protection device for a microwave oven, and an object thereof is to accurately sense a temperature of a cooking chamber by enclosing the temperature sensor so as to block heat approaching from the electronics compartment.

According to the temperature sensor protection device of the microwave oven according to the present invention, the upper end of the temperature sensor 60 protrudes to the outside of the upper surface of the inner case 20 and the lower end is located in the cooking chamber 20a through the inner case 20. Detecting the temperature of the (20a), the cover part 70 is the locking jaw 73 and the first and second brackets 72 to cover the upper end of the temperature sensor 60 to block the air approaching from the electrical equipment compartment 40 Simple and firmly fixed using 75. Accordingly, since the temperature sensor 60 is not affected by the heat generated by the high pressure transformer 42 and the magnetron 41 of the electronics compartment 40, the temperature of the cooking chamber 20a can be accurately sensed. Malfunctions are prevented, and the cooking stroke using the temperature sensor 60 can be accurately performed, thereby improving the product reliability.

Description

Microwave temperature sensor protection device

The present invention relates to a microwave oven for cooking food using a magnetron, and more particularly, to a temperature sensor protection device for a microwave oven to block heat from approaching an electronics compartment by wrapping a temperature sensor that senses a temperature of a cooking compartment. will be.

In general, a microwave oven cooks food by friction heat between molecules by repeatedly changing a molecular arrangement of moisture contained in food by radiating a high frequency of 2450 MHz in a magnetron into a cooking chamber. In addition, recently, by installing an electric heater in the cooking chamber, the function of cooking food using heat generated therein may be added.

As illustrated in FIG. 1, a microwave oven having such a function is formed such that the cooking chamber 4 and the electrical equipment compartment 5 are partitioned inside the main body 1, and the main body 1 has the cooking chamber 4 therein. The formed inner case 3, the inner case 3 and the outer case 3 is coupled to a predetermined distance apart to form an appearance and the electric compartment 5 to be partitioned from the cooking chamber (4).

The electrical component chamber 5 is equipped with a large number of electric parts such as a magnetron 5a that oscillates high frequency and radiates to the cooking chamber 4 and a high voltage transformer 5b that applies a high voltage to the magnetron 5a.

In addition, the cooking chamber 4 provided in the inner case 2 is provided with a cooking plate 4a on which food is placed on the bottom surface, so that cooking can be performed by using radiant heat and convection heat in addition to the high frequency cooking method on the ceiling. An electric heater 2a is installed. In addition, a heat insulating plate 2b is provided on the upper surface of the inner case 2 adjacent to the electric heater 2a to form a predetermined space with the inner case 2.

Meanwhile, in order to prevent the cooking chamber 2a from maintaining the proper temperature or the cooking chamber 4 from overheating according to the cooking method of the food in the microwave oven in which the electric heater 2a is installed, a temperature sensor is placed on the upper part of the inner case 2. (6) is provided. The temperature sensor 6 is electrically connected to the control unit side, which is not shown. The upper end of the temperature sensor 6 is located adjacent to the electrical equipment compartment 5 at the right side of the upper surface of the inner case 2 so as to facilitate the connection thereof. The lower end of the temperature sensor 6 is located in the cooking chamber 4 so as to sense the temperature of the cooking chamber 2.

However, since the conventional microwave oven is installed adjacent to the electrical appliance chamber 5 in which the temperature sensor 6 generates heat, the microwave oven cannot accurately sense the temperature of the cooking compartment 4, which may cause malfunction. have.

That is, considerable heat is generated in the magnetron 5a and the high-pressure transformer 5b of the electrical equipment compartment 5, and this heat is raised to the upper portion of the electrical equipment compartment 5 by convection. And the elevated heat is in contact with the upper end of the temperature sensor 6 located above the inner case (2). Therefore, since the temperature sensor 6 is affected by the hot air in the electrical appliance compartment 5 in addition to the temperature of the cooking compartment 4, a malfunction occurs because the temperature of the cooking compartment 4 is not accurately sensed, and proper cooking of the food is not performed. There is a problem.

The present invention is to solve this problem, an object of the present invention is to wrap the upper end of the temperature sensor exposed to the upper side of the inner case to protect the electronics that can accurately sense the temperature of the cooking chamber by blocking the heat approaching from the electrical equipment room It is to provide a temperature sensor protection device for the stove.

1 is a front sectional view showing the internal structure of a conventional microwave oven.

2 is a perspective view showing a portion of the microwave oven according to the present invention.

3 is an exploded perspective view showing a portion A shown in FIG.

4 is a cross-sectional view taken along the line B-B shown in FIG. 3, showing the coupling state of the cover member.

* Explanation of symbols for main parts of the drawings

10: main body 20: inner case

20a: cooking chamber 50: insulation board

60: temperature sensor 70: cover member

71: blocking portion 72: the first bracket

73: Jam Jaw 74: Rib

75: second bracket 76: fixed plate

The present invention for achieving this object, the inner case formed with a cooking chamber with an electric heater therein, coupled to surround the inner case and the outer case forming the electrical equipment compartment partitioned with the cooking chamber, preventing heat transfer of the electric heater to the outer case side. It is installed outside the upper surface of the inner case so that the insulation board is formed near the distribution hole where air flows through the side. The upper part protrudes above the upper surface of the inner case and the lower part penetrates the inner case to detect the temperature of the cooking chamber. In a microwave oven with a temperature sensor located in the cooking chamber,

Breaking part surrounding the top end of the temperature sensor so that the upper end of the temperature sensor is blocked from the heat of the electrical equipment compartment, extending from one end of the blocking portion and the first bracket having a locking jaw formed at the end to be fitted into the end of the distribution hole, other And a cover member having a second bracket which is bent at the end and is in surface contact with the side surface of the heat insulating plate, and is extended at the bottom of the second bracket to be in surface contact with the upper surface of the inner case, and has a fixing plate having a screw hole perforated to be screwed thereto. It is a characteristic structure.

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Figure 2 is a perspective view showing the overall structure of the microwave oven according to the present invention, Figure 3 and Figure 4 shows a coupling structure of the temperature sensor and the cover member according to the present invention.

As shown in FIG. 2, the microwave oven according to the present invention is hinged to the front surface of the main body 10 and the main body 10 in which the cooking chamber 20a and the electric appliance chamber 40 are partitioned, and thus the cooking chamber 20a is provided. It includes a door 11 for opening and closing the.

The main body 10 is irradiated with a high frequency inside and is coupled to surround the inner case 20 and the inner case 20 in which the cooking chamber 20a is formed so that the front surface is opened, and the electrical equipment compartment 40 is partitioned from the cooking chamber 20a. It is provided with an outer case 30 forming a).

The electrical equipment room 40 is formed in a space between the outer case 30 and the inner case 20, which includes a magnetron 41 and a magnetron 41 for oscillating a high frequency in the cooking chamber 20a. Many electrical components, such as the high pressure transformer 42 and the high pressure capacitor 43, are mounted. In addition, a control panel 12 having a plurality of operation buttons is provided on the front side of the electrical equipment room 40 to select and control various functions of the microwave oven.

The cooking chamber 20a is provided with a turntable type cooking dish 23 so that food is uniformly irradiated with high frequency on the bottom surface thereof, and an electric heater is installed on the ceiling thereof in addition to the cooking method using high frequency to perform cooking using convective heat and radiant heat. (21) is mounted.

In addition, the heat insulating plate 50 is provided on the upper surface of the inner case 20 in order to prevent the heat generated from the electric heater 21 to be transferred to the upper side of the outer case 30. The heat insulating plate 50 is disposed so that a predetermined space is formed between the upper surface of the inner case 20 and blocks the heat conduction of the electric heater 21 by using the air in the space. And the side of the heat insulating plate 50 is a distribution hole 51 is perforated so that air can be flowed into the heat insulating plate (50).

On the other hand, one side of the upper surface of the inner case 20 is controlled by measuring the temperature of the cooking chamber (20a) so that the food is properly cooked and is provided with a temperature sensor 60 to prevent the temperature rise. The temperature sensor 60 is electrically connected to a controller (not shown) side mounted on the rear surface of the control panel 12. Through-holes 22 (see FIG. 3) are drilled on the upper surface of the inner case 20 corresponding to the center of the distribution hole 51 for the installation of the temperature sensor 60, and on the center of the temperature sensor 60. An outwardly extending flange 61 (see also FIG. 3) is provided. Therefore, when the temperature sensor 60 is inserted from the top to the bottom through the through hole 22, the upper end of the temperature sensor 60 protrudes on the upper right side of the upper surface of the inner case 20 adjacent to the electrical equipment compartment 40 side. The lower end penetrates the upper surface of the inner case 20 adjacent to the distribution hole 51 and is positioned in the cooking chamber 20a.

In addition, the cover member 70 is installed on the upper surface of the inner case 20 to protect the temperature sensor 60 to prevent malfunction due to hot air generated in the electrical equipment compartment 40. do.

3 and 4, the cover member 70 includes a blocking unit 71 surrounding the temperature sensor 60, a first bracket 72 and a second bracket 75 fixed to the inner case 20. ), The first and second brackets 72 and 75 are supported by the rib 74 and the fixed plate 76 is fixed.

The blocking unit 71 surrounds the upper end of the temperature sensor 60 while forming a predetermined space with the side surface of the heat insulating plate 50, and both ends of the blocking unit 71 are disposed to contact the side surface of the heat insulating plate 50. In addition, the lower end of the blocking portion 71 is bent inwardly to support the flange 61 portion of the temperature sensor 60.

In addition, the blocking unit 71 is firmly fixed to the inner case 20 through the first bracket 72 and the second bracket 75. The first bracket 72 is bent and extended at one end of the blocking portion 71. The end of the first bracket 72 is provided with a stepping step 73 is stepped so that it is fixed to the side of the heat insulating plate 50 through the distribution hole 51. The stepped degree of the locking step 73 is preferably formed by the thickness of the heat insulating plate 50 at the end of the first bracket (72). In addition, the bottom of the first bracket 72 is provided with a rib 74 is bent extending a predetermined length in the outward direction to support the first bracket 72 by surface contact with the upper surface of the inner case (20). The second bracket 75 is bent and extended from the other end of the blocking portion 71, and a screw hole 75a is formed to be coupled to the side surface of the heat insulating plate 50. In addition, the fixing plate 76 is configured to be bent in the outward direction from the lower end of the second bracket 75 to support the second bracket 75 in surface contact with the upper surface of the inner case 20, also here the inner case 20 The screw hole 76a is drilled to be fixed to the upper surface by the screw 77.

The coupling order of the cover member 70 configured as described above is as follows. First, when the locking jaw 73 provided in the first bracket 72 is inserted into the side surface of the heat insulating plate 50 through the distribution hole 51, the fixing position of the cover member 70 is determined. After that, the second bracket 75 is brought into close contact with the side surface of the heat insulating plate 50, and the cover member 70 is fixed when the screw 77 is inserted into the screw hole 76a formed in the fixing plate 76 and tightened. In addition, the cover member 70 is more firmly installed by tightening the screw 77 in the screw hole 75a of the second bracket 75 and fixing it to the side surface of the heat insulating plate 50. Thus, the cover member 70 is When fixed, the upper end of the temperature sensor 60 is surrounded by the blocking unit 71 to block the heat transfer at the electrical equipment compartment 40 side.

Next, the effect of the cover member according to the present invention configured as described above will be described.

First, when food is put in the cooking chamber 20a and the microwave oven is operated through the operation button of the control panel 12 in a state in which the door 11 is closed, high frequency oscillated from the magnetron 41 is radiated to the cooking chamber 20a. Cooking is performed. At the same time, the electric heater 21 is driven to cook food by the heat generated therefrom.

At this time, the temperature of the cooking chamber 20a is sensed by the temperature sensor 60 and the food is properly cooked at the set temperature.

On the other hand, since the upper end of the temperature sensor 60 is enclosed by the blocking portion 71 of the cover member 70, the upper portion of the temperature sensor 60 is raised from the electrical equipment room 40 side such as the magnetron 41 and the high-pressure transformer 43, etc. It is not affected by hot air. Accordingly, the temperature of the cooking chamber 20a is accurately sensed through the temperature sensor 60, thereby preventing malfunction of the microwave oven and preventing overheating of the cooking chamber 20a.

As described in detail above, according to the temperature sensor protection device of the microwave oven according to the present invention, the upper end of the temperature sensor protrudes outside the upper surface of the inner case and the lower end is located in the cooking chamber through the inner case to detect the temperature of the cooking chamber. To cover the upper end of the temperature sensor and to block the air approaching from the electrical equipment room, the cover member is easily and firmly fixed by using the first and second brackets of the locking jaw. Accordingly, since the temperature sensor is not affected by the heat generated from the high-pressure transformer and the magnetron in the electronics compartment, the temperature of the cooking chamber can be accurately sensed, preventing malfunction of the microwave oven, and precisely performing the cooking stroke using the temperature sensor. There is an advantage that the product reliability is further improved.

Claims (2)

An inner case 20 having an cooking chamber 20a having an electric heater 21 therein, and an outer case which is coupled to surround the inner case 20 and forms an electrical equipment compartment 40 so as to be partitioned from the cooking chamber 20a. (30), the heat insulating plate 50 is installed on the outer surface of the inner case 20 to prevent heat transfer of the electric heater 21 to the outer case 30 side and a distribution hole 51 through which air is circulated. ), And is installed adjacent to the distribution hole 51 and the upper end protrudes over the upper surface of the inner case 20 to sense the temperature of the cooking chamber 20a and the lower end penetrates the inner case 20 to the cooking chamber. In a microwave oven having a temperature sensor 60 located at 20a, a cutoff surrounding an upper end of the temperature sensor 60 such that the upper end of the temperature sensor 60 is blocked from the heat of the electrical equipment compartment 40. The portion 71 is bent and extended at one end of the blocking portion 71 And bent at the other end of the first bracket 72, the blocking portion 71 is formed with a locking jaw (73) at the end to be fitted and coupled to the end of the distribution hole 51 and the side of the heat insulating plate (50) A fixing plate in which a screw hole 76a is perforated so as to be bent and extended to contact the upper surface of the inner case 20 at the bottom of the second bracket 75 and the second bracket 75 in surface contact. And a cover member (70) having a (76). According to claim 1, The lower portion of the first bracket 72 is bent and extended to be in surface contact with the upper surface of the inner case 20 is provided with a rib (74) for supporting the first bracket (72), The second bracket (75), the temperature sensor protection device of the microwave oven, characterized in that the screw hole (75a) is formed to be fixed to the side of the heat insulating plate (50) by a screw (77).

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