KR100207243B1 - Haeted air circulating apparatus for microwave oven - Google Patents

Abstract

The present invention relates to a multi-functional microwave oven, by forcibly circulating the hot air in the cooking chamber to maintain a uniform temperature inside the cooking chamber and to purify without the exhaust of food smell generated during cooking, etc. Relates to a device. The present invention has an air inlet connected to the upper portion of the inner panel and a discharge port connected to the lower portion of the inner panel, and a blower tube communicating the upper and lower portions of the cooking chamber from the outside; A blowing fan installed to discharge air from the suction port side through the discharge port in the blower tube; A purification filter installed to purify the air passing through the blower in the blower; A lattice guide frame installed to smoothly flow the air discharged through the discharge port; An opening and closing plate installed to open and close the blower pipe; A solenoid for selectively operating the opening and closing plate; Upper and lower temperature sensors for sensing an upper and lower temperature in the cooking chamber and outputting an electrical signal; It is provided with a control unit for selectively driving the solenoid according to the signal of the upper and lower temperature sensor.

Description

Hot air circulation device of multi-functional microwave oven

1 is a front view showing a hot air circulation structure of a conventional multi-function microwave oven.

Figure 2 is a front view showing a hot air circulation device of a multifunctional microwave oven according to the present invention.

3 is a perspective view showing a purification filter in a hot air circulation system according to the present invention.

Figure 4 is a perspective view showing the configuration of the opening and closing means in the hot air circulation according to the present invention.

5 is a control block diagram for controlling a hot air circulation device according to the present invention.

6 is a flowchart of a hot air circulation system according to the present invention.

* Explanation of symbols for main parts of the drawings

11: drive chamber 14: cooking chamber

16 heater 18 inner panel

21: blower pipe 23: blower fan

24: Purification filter 25: Lattice induction frame

42: opening and closing plate 44: solenoid

50: control unit S1, S2: upper and lower temperature sensor

The present invention relates to a multi-functional microwave oven, and more particularly, by forcibly circulating hot air in the cooking chamber to maintain a uniform temperature inside the cooking chamber and to purify the food smell generated during cooking without exhausting. It relates to a hot air circulation device of a microwave oven.

A conventional microwave oven includes a box-shaped cabinet having a cooking chamber and a driving chamber therein and a door for opening and closing the cooking chamber. An inner panel is installed inside the cabinet to separate and separate the cooking chamber and the driving chamber. In addition, the door has a structure that can be securely locked to the cabinet by the ratchet device to prevent the leakage of high frequency harmful to the human body, and the edge of the door to prevent the high frequency leakage into the gap between the door and the cabinet. In order to bend at a width of lambda / 4 (λ: wavelength of high frequency). In addition, the opening / closing state of the door is sensed by a series of micro switches so that the cooking operation of the microwave is started while the door is opened to prevent leakage of a large amount of high frequency to the outside. In addition, since the high-frequency blocking film is attached to the transparent window of the door, the amount of leakage of the high frequency can be limited to an acceptable level.

On the other hand, the bottom of the cooking chamber is provided with a tray for placing food, the tray may be a fixed type, may be a rotary type that rotates at a low speed by the tray motor. A high frequency inlet is formed in the ceiling of the cooking chamber, and a stirrer may be provided at the high frequency inlet so that the high frequency is uniformly distributed in the cooking chamber. The driving chamber is equipped with a magnetron generating high frequency and a high voltage transformer for supplying a high voltage current to the magnetron, and a cooling fan for cooling the heat generated during operation of the magnetron and the high voltage transformer is installed through the soundproof plate. .

The magnetron is in communication with the cooking chamber through the waveguide to supply a large amount of high frequency to the cooking chamber when the power is applied to heat the food. In addition, various function selection buttons are arranged on the front panel of the cabinet to set the operation time, cooking mode, etc. of the microwave oven, and the user can control the operation of the microwave by appropriately operating the function selection button.

As shown in FIG. 1, the microwave oven generates a high frequency wave from the magnetron 2 installed in the driving chamber 1, and guides it into the cooking chamber 4 through the waveguide 3 so that the magnetic Cooking is performed by fever. For uniform dispersion of high frequencies, food to be cooked is loaded on the tray 5 and rotated, or a stirrer not shown is used.

Such a microwave oven can be cooked without burning food, and in order to further diversify the cooking method, a multifunctional microwave oven having a heater 6 or a hot air supply fan in the cooking chamber 4 has been developed.

In such a multi-functional microwave oven, various conditions must be properly maintained in order to increase cooking performance, among which heat generated from the heater 6 must be properly circulated in the cooking chamber 4 so that the local temperature difference is small. Food is cooked evenly.

However, since the temperature difference between A, B, and C points in the cooking chamber 4 of the conventional multifunctional microwave oven is very different, the food 7 is not evenly cooked and the food 7 needs to be heated again. There was a limit that cannot be cooked in an optimal state.

In addition, as the heat in the cooking chamber 4 generated during cooking is discharged, the temperature change in the cooking chamber 4 is increased, and when a bad odor generated during cooking remains in the cooking chamber, another kind of subsequent foods It penetrated into (7), altered the intrinsic taste of the food, and lowered the reliability of the product.

The present invention is to solve the above-mentioned conventional problems, an object of the present invention is to effectively circulate the hot air inside the cooking chamber to maintain a uniform temperature inside the cooking chamber, to remove the bad food smell generated during cooking to the outside The present invention provides a hot air circulation system for a multifunctional microwave oven which can be purified without exhausting.

In order to achieve the above object, the present invention is characterized in that the cooking chamber and the driving chamber are separated and separated by an inner panel, and in the microwave oven in which a heater is installed in the cooking chamber, A blower tube having a discharge port connected to the upper and lower parts of the cooking chamber to communicate with the outside; A blowing fan installed to discharge air from the suction port side through the discharge port in the blower tube; A purification filter installed to purify the air passing through the blower in the blower; A lattice guide frame installed to smoothly flow the air discharged through the discharge port; An opening and closing plate installed to open and close the blower pipe; A solenoid for selectively operating the opening and closing plate; Upper and lower temperature sensors for sensing an upper and lower temperature in the cooking chamber and outputting an electrical signal; The hot air circulation system of the multifunctional microwave oven having a control unit for selectively driving the solenoid according to the signal of the upper and lower temperature sensor.

Accordingly, the present invention provides air circulation in the cooking chamber by sucking the air in the upper part of the cooking chamber maintaining a relatively high temperature through the blower tube and blowing the lower portion of the cooking chamber in the lower temperature chamber, and particularly providing an opening / closing means for selectively opening and closing the blower tube in the blower tube. It can be used effectively when cooking requiring a uniform temperature distribution.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of a hot air circulation device of a multi-functional microwave oven according to the present invention will be described.

2 to 6 are views for explaining the hot air circulation device of the multi-functional microwave oven according to the present invention.

First, FIG. 2 shows a configuration of a hot air circulation system of a multi-functional microwave oven according to the present invention. According to the present invention, the heater 16 is installed above the cooking chamber 14, and the driving chamber 11 is shown. The magnetron 12 is provided, and the waveguide 13 is provided between the drive chamber 11 and the cooking chamber 14. An inlet port 19 is formed above the heater 16 and an outlet port 20 is formed in the inner panel 18 that separates the drive chamber 11 and the cooking chamber 14 from the cooking chamber 14. have. A blower tube 21 connecting the suction port 19 and the discharge port 20 is installed in the drive chamber 11 to constitute the hot air circulation device 30.

Therefore, when hot air is generated in the cooking chamber 14 by the heat generated by the heater 16, the hot air is introduced through the suction port 19, and only in the cooking chamber 14 again through the discharge port 20 of the blower tube 21. The temperature difference in the cooking chamber 14 is eliminated by being circulated by the hot air circulation device 30 provided on the drive chamber 11 side without being circulated.

As shown in FIG. 2 and FIG. 3, the blower fan 23 which is operated by the motor 22 is installed inside the blower tube 21 by the circulation apparatus of this invention, and also the purifying filter 24 is furthermore. It is provided. Inside the blower tube 21, a blower fan 23, a motor 22, and a purification filter 24 are installed, and the blower fan 23 and the motor 22 have a boundary between the discharge port 20 and the blower tube 21. The purification filter 24 is installed in two places at intervals in the middle of the blower tube 21. The purification filter 24 mainly consists of activated carbon.

Accordingly, the hot air is forcedly circulated by the operation of the blower fan 23, and the bad food odor and other odors in the cooking chamber 14 are purified by the purifying filter 24, and the hot air in a clean state is circulated in the cooking chamber 14 at all times. By doing so, there is an effect that the cooking state of the food 17 can be kept good and clean. Purification filter 24 may be provided in two or more, if necessary, in this case, the purification filter located close to the inlet (19) to purify the fine solid substances and oil suspended in the air, and located behind the The purifying filter is preferably used to purify the odor component in the air. In addition, the present invention can be configured to be detachably attached to the blower tube 21 so that the cleaning filter can be cleaned. As illustrated in FIG. 3, an entrance 20a may be formed at one side of the blower tube 21, and the purification filter 24 may be detachably installed through the entrance 20a.

As shown in FIG. 4, an opening and closing means 40 for selectively opening and closing the blower tube 21 is provided. The opening and closing means 40 includes an opening and closing plate 42 which is rotatably coupled to the shaft 42a inside the blower tube 21. In addition, a solenoid 44 is provided outside the blower tube 21 to rotate the opening and closing plate 42 by a predetermined control signal.

As shown in FIG. 5, for example, a control unit for driving the solenoid 44 by a separate switch 70 or when selecting a specific cooking mode such as cooking requiring a uniform temperature distribution in the function selection button 60 ( 50). The cooking chamber 14 includes temperature sensing means for measuring a temperature in the cooking chamber 14 and outputting a signal to the controller 50. The temperature detection means is installed above the center line based on the height of the cooking chamber 14, the upper temperature sensor (S2) for measuring the upper temperature, and the lower temperature sensor (S1) is installed below the center to measure the lower temperature It consists of.

Therefore, the controller 50 opens the blower tube 21 and opens the blower fan 23 only when the measured value of the upper temperature sensor S2 is higher than a set value higher than the measured value of the lower temperature sensor S1. By driving, the temperature distribution in the cooking chamber 14 can be kept uniform at all times. According to the present invention, the temperature sensing means may be installed in three places by dividing the height of the cooking chamber 14 into upper, middle and lower.

On the other hand, the present invention is provided with a plurality of lattice-shaped induction frame 25 in the discharge port 20, the induction frame 25 makes the flow of air discharged through the discharge port 20 more smoothly to force the hot air The circulation is more effectively maintained to maintain a uniform temperature in the cooking chamber 14.

Referring to the operating state of the hot air circulation device of the multi-functional microwave oven according to the present invention as described above are as follows.

First, as shown in FIG. 2, when the microwave oven is operated, the heater 16 is operated to cook the food 17 by direct heat. At this time, the heater 16 is installed in the upper portion of the cooking chamber 14, and hot air rises to the upper side due to the flow characteristics of the air, so that hot air is positioned in comparison with the lower portion. Therefore, the upper surface of the food is subjected to a relatively high heat compared to the lower surface and the cooking speed is different.

In the cooking state as described above, the present invention blows the lower portion of the cooking chamber 14 through the discharge port 20 after the high-temperature air flows into the suction port 19 by the driving of the blower fan 23 installed in the blower tube 21. Therefore, the temperature distribution in the cooking chamber 14 is maintained evenly to cook the food evenly.

In addition, according to the present invention, the hot air introduced into the suction port 19 is purified while passing through the purification filter 24 installed in the blower pipe 21 and moved to the discharge port 20 in a clean state. At this time, the hot air is increased by the grid-shaped induction frame 25, the discharge force is increased so that the hot air flowing into the suction port 19 side is relatively high suction force.

Referring to this with reference to the flowchart of FIG. 6, when cooking is started first (S100), it is determined whether the selection switch 70 is 'on' (S110), and when the switch 70 is in an 'on' state, the controller 50 When the open signal of the blower tube 21 is output and the switch is 'off', it is determined in the next step whether a specific mode is selected, for example, whether cooking requires a uniform temperature distribution or cooking for high frequency. (S120). In addition, the control unit 50 compares the signals output from the upper temperature sensor (S2) and the lower temperature sensor (S1) (S130), and when the measured value of the two parts of the comparison result is greater than the set value, the blower tube 21 is opened. At the same time (S140), and at the same time driving the blowing fan 23 (S150), the air in the cooking chamber 14 through the blower tube 21 to circulate.

By circulating the hot air as described above, the temperature difference for each part in the cooking chamber 14 is uniform, and the bad food smell mixed with the hot air is cleansed and thus clean and evenly cooked food 17 can be cooked. have.

In particular, the present invention operates a signal of a function selection mode or a separate switch when the microwave oven does not require air circulation, for example, when cooking using only a high frequency or in a cooking mode that does not require a particularly uniform temperature distribution. The solenoid 44 is driven by the control unit 50 to rotate the opening and closing plate 42, and the air in the cooking chamber 14 is heated by closing the blower tube 21 by the opening and closing plate 42. It is possible to prevent the deterioration of the thermal efficiency due to the high frequency loss due to the high frequency penetrates into the blower tube 21 or shortens the life cycle of the purification filter 24 by blocking the natural circulation.

As described above, by the hot air circulation device of the multifunctional microwave oven of the present invention, the hot air is sucked into the suction pipe formed on the driving chamber side, passes through the blower tube in which the purification filter is installed, and is discharged back to the discharge port so as to be circulated. The food can be cooked evenly with little variation, the food is cooked evenly, and the bad food smell is cleansed cleanly, and the blower can be selectively used as needed to have a high effect on the quality of the microwave.

Claims (2)

In a microwave oven in which a cooking chamber and a driving chamber are separated by an inner panel and a heater is installed in the cooking chamber, a suction port 19 connected to an upper portion of the inner panel 18 and a lower portion of the inner panel 18 are provided. A blower tube 21 having a discharge port 20 connected to the upper and lower portions of the cooking chamber 14 to communicate with the outside; A blowing fan (23) installed in the blower pipe (21) to inlet air from the inlet port (19) and discharge it through the outlet port (20); A purifying filter 24 installed to purify the air passing through the blowing tube 21 in the blowing tube 21; A lattice guide frame 25 installed to smoothly flow the air discharged through the discharge port 20; An opening and closing plate 42 installed to open and close the blower tube 21; A solenoid 44 for selectively operating the opening and closing plate 42; Upper and lower temperature detection sensors S1 and S2 which detect upper and lower temperatures in the cooking chamber 14 and output electrical signals; And a controller (50) for selectively driving the solenoid (44) according to the signals of the upper and lower temperature sensors (S1, S2). The method of claim 1, wherein the control unit 50 opens the blower tube 21 when the measured value of the upper temperature sensor S2 is higher than a set value higher than the measured value of the lower temperature sensor S1. At the same time, the blower fan 23 is hot air circulation device of a multifunctional microwave, characterized in that.