JP2003074872A - High frequency cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a conventional high frequency cooker such as that there is a restriction on the space within the main body due to the influence of an installation place and a path from a cooling fan to an exhaust port is difficult of rectilinear arrangement, so it can not perform efficient cooling. SOLUTION: This high frequency cooker is equipped with a frame 1 which has the side, the base, and the rear, and where a suction port and an exhaust port are bored, a heating chamber 2 which is installed within that frame 1 so as to store food, the first magnetron 6 which supplies microwaves into that heating chamber 2, the first inverter board 10 where an inverter part for controlling the drive of that first magnetron 6 is installed, and the first cooling fan 12 which supplies cooling air to the above first magnetron 6 and the inverter substrate 10 so as to cool them, and the above first cooling fan 12 is arranged in a position beside the position on the extension from the exhaust port 18 of the above frame 1, and also the above inverter board 10 is arranged in such a wind-direction-changeable position as to change the wind direction so that the cooling wind from the above first cooling fan 12 may turn to the above exhaust port.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating cooker for cooling a magnetron and a control board with a cooling fan.

[0002]

2. Description of the Related Art Conventionally, a high-frequency heating cooker of this type is described in Japanese Patent Laid-Open No. 63-281380.

In this device, a heating chamber is provided inside a frame, and a magnetron and a control board for controlling and driving the magnetron are arranged in a space between a side portion of the heating chamber and the frame. The control board also includes an inverter board on which an inverter unit for supplying high-frequency power to the magnetron is mounted.

Then, a cooling fan is arranged at the rear of the magnetron, the cooling air is taken in through an intake port formed in the rear surface of the frame by the cooling fan, and the cooling air is supplied to the control board and the magnetron, and then the bottom surface and side surfaces of the frame. The air is exhausted from the exhaust port provided in the.

[0005]

However, the place where the high-frequency heating cooker is installed usually does not have much space around it. Depending on the place, there may be no space at all.

In such a situation, even if an exhaust port is provided on the bottom surface or side surface of the frame, the ventilation resistance near the exhaust port becomes large, and the cooling air cannot be exhausted efficiently from the exhaust port.

Particularly, in a cooker used for business purposes, the kitchen at the installation location is not so wide and the space between the heating chamber side portion and the frame side surface may not be provided. The magnetron and control board will be placed in the space between them. In this case, it is difficult to linearly arrange the path from the cooling fan to the exhaust port, and this also causes the cooling air to not be efficiently exhausted from the exhaust port.

The present invention is to solve such a problem.

[0009]

According to the present invention, there is provided a frame having a side surface, a bottom surface and a rear surface, in which an intake port and an exhaust port are formed, and a heating unit which is provided in the frame and which stores food. Chamber, a magnetron for supplying microwaves to the heating chamber, a control unit for controlling the driving of the magnetron, a control board on which the control unit is mounted, and cooling air by supplying cooling air to the magnetron and the control board. And a cooling fan for
The cooling fan is arranged at a position deviating from the position on the extension line from the exhaust port of the frame, and the control board changes the wind direction so that the cooling air from the cooling fan is directed to the exhaust port. This is a configuration in which the wind direction can be changed.

Further, the control unit further includes an inverter unit having a switching element, which converts the commercial power source into a high frequency power source by turning on / off the switching element and supplies the high frequency power source to the magnetron. The control board is configured to separate the inverter board on which the inverter section is mounted from the board on which the other control section is mounted, and at least arrange the inverter board at the wind direction changeable position.

Further, the exhaust port of the frame is arranged on the rear surface of the frame, and the magnetron, the cooling fan and the inverter board are arranged between the heating chamber and the rear surface of the frame. Is.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 and 2, reference numeral 1 is a main body which is an exterior of a high frequency heating cooker, and 2 is provided inside the main body 1,
A heating chamber for accommodating and heating food, 3 is a door for opening and closing a front opening of the heating chamber, 4 is an operating section in which an input key for inputting heating conditions, a heating start key for instructing heating start, and the like are arranged. An intake port arranged below the door 3 for intake of cooling air for cooling electric components inside the main body 1 which will be described later,
Reference numeral 6 denotes a placing table which is placed in the heating chamber 2 and on which food is placed.

An example of such a high-frequency heating cooker in which the magnetron and the control board are arranged in the rear part of the heating chamber 2 to save the width of the cooker will be described.

In FIGS. 3 and 4, reference numeral 6 denotes a first magnetron which is disposed above the rear portion of the heating chamber 2, oscillates microwaves, 7 denotes a second magnetron which is also disposed below the rear portion of the heating chamber 2, and 8 denotes a second magnetron. The first waveguide guides the microwave oscillated by the one magnetron 6 into the heating chamber 2, and the second waveguide 9 guides the microwave oscillated by the second magnetron 7 into the heating chamber 2.

Numeral 10 converts a commercial power source into a high frequency power source,
A first inverter board 11 on which a first inverter unit for supplying high frequency power to the first magnetron 6 is placed, and 11 also converts a commercial power source to a high frequency power source, and a second magnetron 7
It is a second inverter substrate on which a second inverter unit for supplying a high frequency power is mounted. On the first inverter board 10 and the second inverter board 11 are arranged operation control boards on the back surfaces of which an operation control section including a microcomputer for controlling the operation of each magnetron is mounted.

In the present invention, each inverter section and the operation control section together correspond to a control section, and the inverter board and the operation control board together correspond to a control board.

Reference numeral 12 denotes a first cooling fan for supplying and cooling cooling air to the first magnetron 6 and the first inverter board 10, and 13 denotes cooling air from the first cooling fan 12 for the first magnetron 6 and the first inverter board. A first duct 14 leading to 10 supplies a cooling air to the second magnetron 7 and the second inverter board 11, and a second cooling fan 15 for cooling the same.
Is a second duct that guides the cooling air from the second cooling fan 14 to the second magnetron 7 and the second inverter board 11.

The rear surface 2a of the heating chamber 2 and the rear surface 1 of the main body 1
The first and second magnetrons 6 and 7, the first and second inverter bases 10 and 11, the first cooling fan 12, the second cooling fan 14, and the like described above are housed in the space 16 between a and a. Has been placed.

The fin portion 6 of each of the first magnetron 6 and the second magnetron 7 is formed on the rear surface 1a of the main body 1.
An exhaust port 17 is provided at a position facing a, 7a, and an exhaust port 18 is also provided at a position facing the first inverter substrate 10 and the second inverter substrate 11.

The cooling air introduced through the first duct 13 is
It is passed between the first magnetron 6 and the rear surface 2 a of the heating chamber 2. In addition, during this period, the MQ airflow direction plate 19 that guides a part of the cooling air to the first magnetron 6 and the heating chamber airflow direction plate 20 that supplies a part of the cooling air from the intake port 21 of the heating chamber rear surface 2a. It is arranged.

A part of the cooling air supplied from the first cooling fan 12 through the first duct 13 is supplied to the first magnetron 6 by the MQ wind direction plate 19, and then exhausted from the exhaust port 17. In addition, the MQ wind direction plate 19 and the heating chamber wind direction plate 20
The cooling air that has not been guided in step 1 is supplied to the first inverter board 10 and then exhausted from the exhaust port 18.

The first inverter board 10 cools the cooling air, which is supplied from the first cooling fan 12 and is supplied in parallel to the rear surface 1a of the main body 1, so that the cooling air can be smoothly exhausted from the exhaust port 18 of the rear surface 1a. It is arranged diagonally to the direction of air flow.

In the present invention, the positional relationship between the first cooling fan 12 and the exhaust port 18 is such that the first cooling fan is arranged at a position deviated from the position on the extension line from the exhaust port 18 of the main body 1. In addition, the position of the first inverter board 10 corresponds to the wind direction changeable position.

The rear surface 2a of the second magnetron 7 and the heating chamber 2
Is the same as the configuration between the first magnetron 6 and the rear surface 2a of the heating chamber 2 described above, and the second inverter board 11 smoothly exhausts the cooling air as does the first inverter board 10. As possible, it is arranged so as to be inclined with respect to the second cooling air.

The control circuit having such a configuration will be described below with reference to FIGS.

Reference numeral 21 is a commercial power source, 22 is a switch which is turned on / off in association with opening / closing of the door 3 and operation of a heating start key of the operating section 4, 23 is a first magnetron 6 for supplying high frequency power converted from the commercial power source to the first magnetron 6. 1 inverter part, 24 is a 2nd inverter part which supplies the high frequency power converted from the commercial power to the 2nd magnetron 7.

The first inverter section 23 includes a smoothing capacitor 25, a first high voltage transformer 26, and a first high voltage transformer 2.
A resonance capacitor 27 connected in parallel with the primary winding of 6;
Primary winding of first high voltage transformer 26 and resonance capacitor 27
And a switching element 28 such as an IGBT connected in series in a parallel circuit with.

Reference numeral 29 is a high voltage capacitor, 30 is a high voltage diode, and the high voltage capacitor 29 and the high voltage diode 30
Are connected in series and are connected to the secondary winding of the first high voltage transformer 26, and the high voltage diode 30 is connected between the anode and the cathode of the first magnetron 6. The first
The cathode of the magnetron 6 is also connected to the heater winding of the first high voltage transformer 26.

The second inverter unit 24 has the same structure as the first inverter unit 23 described above, and is parallel to the smoothing capacitor 31, the second high voltage transformer 32, and the primary winding of the second high voltage transformer 32. Resonant capacitor 33 connected to
And a switching element 34 such as an IGBT connected in series with a parallel circuit of the primary winding of the second high voltage transformer 32 and the resonance capacitor 33.

Reference numeral 35 is a high voltage capacitor, 36 is a high voltage diode, and the high voltage capacitor 35 and the high voltage diode 36 are provided.
Are connected in series and are connected to the secondary winding of the second high voltage transformer 32, and the high voltage diode 36 is connected between the anode and the cathode of the second magnetron 7. The second
The cathode of the magnetron 7 is also connected to the heater winding of the second high voltage transformer 32. 37 is an ON signal generator that outputs ON signals for the switching elements 28 and 34;
Reference numeral 8 denotes an MQ drive control unit that switches the operations of the first magnetron 6 and the second magnetron 7 in a predetermined cycle in synchronization with the zero cross of the commercial power supply 21. Reference numerals 39 and 40 are AND circuits that output the result of the logical product of the input signals, and 41 is an inverting circuit that inverts the input signals.

In such a configuration, the output of the MQ drive control unit 38 is input to one input terminal of the AND circuit 39,
The output of the ON signal generator 37 is input to the other input terminal. Then, the result of the logical product is output to the switching element 28. In addition, the MQ drive control unit 38 is connected to one input terminal of the AND circuit 40 via the inverting circuit 41.
The output signal of the ON signal generator 37 is input to the other input terminal of the AND circuit 40. Then, the result of the logical product is output to the switching element 34.

That is, the switching elements 28 and 34 are alternately driven in a predetermined cycle according to the output of the MQ drive control section 38, which prevents them from being driven at the same time.

In the above-described embodiment, the configuration in which the magnetron and the control substrate are arranged in the rear part of the heating chamber has been described, but the present invention is not limited to this, and the same effect can be obtained even if they are arranged in the side part of the heating chamber. It is a thing.

[0034]

According to the present invention, the ventilation from the cooling fan to the exhaust port can be smoothly performed, and efficient cooling can be realized.

[Brief description of drawings]

FIG. 1 is an external view of a high-frequency heating cooker according to the present invention.

2 is an external view of the door of FIG. 1 when opened.

FIG. 3 is a plan view of the rear part of the heating chamber.

FIG. 4 is a top view of the essential parts of the rear part of the heating chamber.

FIG. 5 is a control circuit diagram of the high-frequency heating cooker.

FIG. 6 is a control circuit diagram of a control unit that drives and controls the switching element in FIG.

[Explanation of symbols]

2 heating chambers 6 1st magnetron 7 Second magnetron 10 First inverter board 11 Second inverter board 12 First cooling fan 14 Second cooling fan 18 Exhaust port

Claims (3)

[Claims] 1. A frame having a side surface, a bottom surface, and a rear surface, in which an intake port and an exhaust port are formed, a heating chamber provided inside the frame for storing food, and a microwave in the heating chamber. The magnetron to be supplied, a controller for controlling the drive of the magnetron, a control board on which the controller is mounted, and a cooling fan for supplying cooling air to the magnetron and the control board to cool the magnetron and the cooling board. The fan is arranged at a position deviating from the position on the extension line from the exhaust port of the frame, and the control board changes the wind direction so that the cooling air from the cooling fan is directed to the exhaust port. A high-frequency heating device characterized by being placed in a possible position. 2. The control unit further includes an inverter unit that has a switching element, converts the commercial power source into a high frequency power source by turning the switching element on and off, and supplies the high frequency power source to the magnetron. The control board separates an inverter board on which the inverter section is mounted and a board on which other control sections are mounted, and at least arranges the inverter board at the wind direction changeable position. The high frequency heating cooker according to 1. 3. The exhaust port of the frame is arranged on a rear surface of the frame, and the magnetron, the cooling fan and the inverter board are arranged between the heating chamber and a rear surface of the frame. The high frequency heating cooker according to claim 2.