JP3489154B2 - High frequency heating equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved cooling method for a high frequency heating device.

[0002]

2. Description of the Related Art Conventionally, in a high output type high frequency heating apparatus which also uses a heater, many electric parts such as a plurality of high frequency oscillators, high voltage transformers, high voltage condensers, cooling fans, control parts, etc. are used in addition to the heaters. .

[0003]

However, if all of these parts are stored in a limited space, the space between the parts will be narrowed and the heat generated by each part will not be easily dissipated. Since it becomes difficult to flow, it was very difficult to perform sufficient cooling in order to guarantee that all parts operate safely.

Further, in the case where the latch switch for stopping the oscillation of radio waves when the door is opened and the holder part of the latch switch are located on the suction side in the cooling circuit, they are provided on the door. Since the key for operating the latch switch passes through, the hot air leaking from the heating chamber is sucked into the vicinity of the latch switch through the hole provided in the front of the heating chamber, so the temperature of the latch switch does not exceed the allowable temperature. There are problems such as overrunning and deformation unless the resin holder is replaced with a heat resistant one.

When a high-power semiconductor element such as a triac for intermittently controlling electrical parts is used, it is mounted on an expensive radiator with many radiation fins to cool it, and for safety. The whole body including the radiator
An insulating plate for electrically insulating other non-charged metal parts is required, but this requires a large space and is costly.

When two high voltage transformers are used to obtain a high output of high frequency, a large space is required to secure a sufficient insulation distance between the coil and the terminal on the high voltage side. Was tough.

Therefore, it is a first object of the present invention to provide a method of efficiently storing and cooling components of a high-power type high-frequency heater with a heater, which uses a plurality of high-frequency oscillators.

A second object of the present invention is to provide a method for cooling the latch switch and its holder provided on the intake side by sucking in high temperature air in the heating chamber so as not to exceed an allowable temperature or deform. And

A third object is to provide a structure for effectively cooling and insulating a high power semiconductor device such as a triac in a space-saving manner.

A fourth object of the present invention is to provide a structure in which, when two high-voltage transformers are used, the space required for securing the insulation distance on the high-voltage side is reduced and the parts can be arranged efficiently. To do.

[0011]

In order to achieve the first object, the present invention provides a cooling fan at the rearmost part of the electric chamber in the main body, and has a cooling air intake port and a cooling fan intake part. Is connected by two intake air passages, one is a ventilation passage that passes through the lower side of the electric room and the other is an air passage that passes through the upper side.In the lower ventilation passage, multiple high-voltage transformers and high-voltage condensers are arranged in this order. , Other control electrical components are arranged in series in the upper ventilation passage, and the plurality of high-frequency oscillators are arranged in parallel between the two intake ventilation passages and in the exhaust ventilation passage of the cooling fan. The air after cooling the high frequency oscillator is exhausted from the rear surface of the main body through the exhaust passage located on the back side of the upper intake air passage.

Further, in order to achieve the second object, according to the present invention, the latch switch and the resin holder are located in the ventilation passage on the intake side of the cooling fan, and the outlet of the cooling fan is connected to the high frequency oscillator. Open a part of the ventilation passage,
The air leaked from the opening is blown toward the resin holder.

Further, in order to achieve the third object, according to the present invention, a part of an air guide connecting the outlet of the cooling fan and the high frequency oscillator is made of an insulating material partially provided with slit holes, and a triac is formed. The fixed heat radiating plate is fixed to a part of the air guide made of the insulating material, and is inserted into the air guide through the slit hole so as to be parallel to the air flow.

Further, in order to achieve the fourth object, the present invention has a structure in which two high voltage transformers are arranged adjacent to each other so that their high voltage terminals face each other, and the two high voltage transformers are operated in the same phase. Is.

[0015]

In the high frequency heating apparatus of the present invention, the cooling fan is located at the rearmost part of the main body, the intake ventilation passage is divided into the upper side and the lower side of the electric chamber, and the high frequency oscillator is cooled between the two ventilation passages. The two high-frequency oscillators and their associated electrical components are efficiently stored by arranging them in the ventilation path on the blow-out side of the fan and exhausting the air after cooling the high-frequency oscillator through the exhaust path that intersects with the upper ventilation path. At the same time you can
A smooth cooling air flow can be created, and an efficient cooling effect can be obtained.

Further, in the high-frequency heating apparatus of the present invention, a part of the cooling air leaked from the opening provided in a part of the ventilation passage connecting the outlet of the cooling fan and the high-frequency oscillator is introduced into the ventilation passage on the intake side of the cooling fan. By blowing it on the latch switch and resin holder provided in the heating chamber, it is possible to lower the suction pressure in the hole through which the door key provided in the front of the heating chamber passes, and the sucked hot air leaking from the heating chamber can be reduced. Since it can be made difficult to suck in, the temperature of the latch switch and the holder made of resin can be kept below the allowable temperature.

Further, in the high frequency heating apparatus of the present invention, a part of the air guide through which cold air flows is made of an insulating material partially provided with slit holes, and the heat dissipation plate of the triac is made of an insulating material. By fixing it to a part, the triac can be insulated from the non-charged metal part, and at the same time, the heat dissipation plate is inserted into the air guide from the slit hole of the insulating material so that it is parallel to the air flow, It is possible to efficiently cool the TRIAC with a small heat dissipation plate without disturbing the internal air flow.

Further, in the high frequency heating apparatus of the present invention, the two high voltage transformers are arranged adjacent to each other so that the high voltage terminals face each other, and the two high voltage transformers are operated in the same phase. Since the potential difference between the high voltage coil and the terminal can be made zero, and the insulation distance between the high voltage terminals of the two high voltage transformers is theoretically unnecessary, the space inside the electric room can be used effectively. Wear.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

1, FIG. 2 and FIG. 3, FIG.
The flow of the cooling air is shown by an arrow in FIG. 3, and FIG. 3 shows a state in which the high-voltage transformer is removed from FIG. Two high-frequency oscillators 3 are provided substantially in the center of the electric room 4, and a cooling fan 5 for cooling electric parts is provided behind the two high-frequency oscillators 3. The cooling fan 5 is a sirocco fan type and has intake ports 6 on both sides of the upper surface and the lower surface.

Reference numeral 7 denotes an intake port provided on the bottom surface of the main body, and the cooling air sucked from here is a vertical partition plate 8 and a Z-shaped partition plate 9 that flows through the ventilation passage above the electric chamber 4. Divided into the wind flowing through the lower ventilation passage. Two high voltage transformers 10 and a high voltage condenser 11 (1
(Not shown) are provided, and the high voltage transformer 10 is arranged such that the coils thereof face each other.

In the upper ventilation passage, a control printed circuit board 12 for controlling the operation of each electric component, a latch switch 13 for opening a main circuit when the door is opened, a resin holder 14, and a low voltage are applied to the printed circuit board. Low voltage transformer to supply 1
5, buzzer circuit board 16, triac control board 17,
A noise filter substrate 18 and the like are provided. An air guide 19 is connected to the cooling fan 5, and the wind guided by this cools the two high-frequency oscillators 3 and is then electrically driven by the exhaust air guides 20 and 21 on the rear side of the upper intake air passage. The exhaust guide 2 is guided to the rear of the chamber 4.
Exhausted from 2.

With the above-described structure, the intake air passage divided into two on the intake side of the cooling fan and the one air passage on the outlet side are formed, and a smooth air flow for cooling can be realized. By arranging a large high-pressure component in the intake air passage on the lower side, placing a high-frequency oscillator in the air passage on the blowing side, and arranging other electric components in the intake air passage on the upper side, All electric parts can be efficiently and orderly arranged along the wind flow, and a sufficient cooling effect can be obtained.

In FIG. 4, on the rear wall 23 of the heating chamber 2, there is a hot air outlet 24 for circulating hot air in the heating chamber.
And an intake port 25, and a heater and a hot air circulation fan (neither shown) are provided behind the rear wall of the heating chamber. The door of the heating chamber can be opened and closed freely.
And the door 26 is provided with door keys 27 and 28. When the door is closed, the door keys 27, 28 penetrate through the long holes 29, 30 provided in the front wall of the heating chamber to turn on the plurality of latch switches 13 behind them, and conversely, the door keys. Set to OFF when is open. Since the latch switch 13 and the resin holder 14 are located in the cooling-side intake air passage, they leak from the heating chamber and are exposed to the hot air sucked from the long holes 29 and 30 through which the door key passes. As shown in FIG. 5, since the air guide 19 is provided with the opening 31 at the tip thereof, the cooling air leaking from the opening 31 is blown to the latch switch 13 and the resin holder 14, whereby the long hole is formed. The suction pressure in the 29th and 30th portions can be reduced, and it becomes difficult for hot air to be sucked in. Reference numeral 32 is an opening connected to the two high-frequency oscillators, and the cooling air guided by the air guide 19 flows into the high-frequency oscillator through these openings.

As described above, a part of the blowing air is blown from the opening provided at the tip of the air guide 19 to the latch switch provided on the intake side and the holder made of resin, whereby the hole portion of the door key is formed. It is possible to lower the suction pressure in, so that it becomes difficult for hot air to be sucked in, and the cooling effect is also improved by blowing air on these parts, so the temperature of the latch switch can be lowered to the allowable temperature or less, Also, the resin holder does not have to be heat-resistant.

FIG. 6 is a sectional view of the air guide 19 taken vertically. An air guide wall 33 is made of an insulating material, constitutes a part of the air guide 19, and has a slit hole 34 in a part thereof. Reference numeral 35 denotes a high-power semiconductor element such as a triac for intermittently controlling the heater, which is fixed to a heat radiating plate 36 made of a single metal plate having good thermal conductivity such as aluminum. The heat radiating plate 36 penetrates through the slit hole 34 of the air guide wall 33 and is inserted into the air guide 19 in parallel with the wind flow.

As described above, since the heat dissipation plate of the triac is inserted in the air guide through which the cooling air flows, a sufficient cooling effect can be obtained even with a simple metal plate.
Furthermore, since the heat sink is fixed to the air guide wall that is made of an insulating material that forms part of the air guide, there is no need to insulate it further, and the triac can be fixed and cooled with a very inexpensive and simple structure. It can be performed. Further, since the heat radiating plate is inserted into the air guide parallel to the air flow, it does not disturb the flow of the cooling air.

In FIG. 7, the two high-voltage transformers 10 are arranged in the lower intake air passage with their coils facing each other, and the high-voltage terminals face each other. Since the two high voltage transformers operate in the same phase, no potential difference is generated between the high voltage terminals facing each other. From the intake port 7 to the intake part 6 of the cooling fan 5
The lower intake ventilation path through which the wind flows toward the front side has the vertical partition plate 8 and the lower partition 37 made of cushion rubber, so that the inlet thereof is on one surface side of the core of the front high-voltage transformer, The flow of the cooling air is largely divided into a wind flowing between the front side of the coil of the high-voltage transformer on the front side and the vertical partition plate 8 and a wind flowing between the coils of two transformers facing each other. The rear side is very close to the intake of the cooling fan, so all the wind flows through it. Therefore, cooling air can be made to flow over all the surfaces of the coils of the two high-voltage transformers, and the high-voltage transformers can be cooled efficiently. Since there is a small gap between the rear core of the transformer and the lower partition 37, there is very little wind flowing through it.

As described above, by disposing the two high-voltage transformers so that the high-voltage terminals face each other and operating the two high-voltage transformers in opposite phases, the insulation distance between the two high-voltage transformers becomes unnecessary. Parts can be placed efficiently using the narrow space of the electric room.

Further, two high-voltage transformers are arranged adjacent to each other in the front and rear so that the coils face each other in the intake air passage on the lower side, and a cooling fan is provided behind the two high-voltage transformers so that the air flow in the air passage on the lower side is reduced. By providing the inlet on the core surface side of one side of the high voltage transformer on the front side, there is no need for an insulation distance between the coil of the high voltage transformer and the non-charged metal part, and moreover, cooling is performed on all surfaces of the coils of the two high voltage transformers. The high-voltage transformer can be efficiently cooled while efficiently using the narrow space of the electric room by allowing the air to flow.

[0031]

As described above, in the high frequency heating apparatus of the present invention, the cooling air is cooled by forming the intake ventilation passage divided into two on the intake side of the cooling fan and the one ventilation passage on the blowing side. A large high-pressure component is placed in the intake air passage on the lower side, a high-frequency oscillator is placed in the air passage on the blowing side, and a high-frequency oscillator is installed in the intake air passage on the upper side. By arranging other electrical parts,
All the electric parts can be efficiently and orderly arranged along the wind flow, and the parts can be arranged by effectively utilizing the space in the electric room, and at the same time, a sufficient cooling effect can be obtained.

Further, two high-voltage transformers are arranged adjacent to each other in the front and rear so that the coils face each other in the intake air passage on the lower side, and a cooling fan is provided on the rear side of the two high-voltage transformers so that the air flow in the air passage on the lower side is reduced. By providing the entrance on the core surface side of one side of the high voltage transformer on the front side, no insulation distance is required between the coil of the high voltage transformer and the non-charged metal part, and moreover, on all surfaces of the coils of the two high voltage transformers. Cooling air can be passed, and the high voltage transformer can be efficiently cooled while efficiently using the narrow space of the electric chamber.

Further, a part of the blowing air is blown from the opening provided at the tip of the air guide 19 to the latch switch provided on the intake side and the resin holder, so that the suction pressure in the hole portion of the door key is increased. Lower to make it harder to suck hot air from the hole, and at the same time enhance the cooling effect of these parts by the blown air, so that the temperature of the latch switch can be lowered below the allowable temperature.
Also, it is not necessary to use a heat-resistant resin holder.

Further, since the heat dissipation plate of the triac is made of one metal plate and is inserted into the air guide through which the cooling air flows, a simple one metal plate can obtain a sufficient cooling effect. be able to. Furthermore, since the heat sink is fixed to the air guide wall that is made of an insulating material that forms part of the air guide, there is no need to insulate it further, and the triac can be fixed and cooled with a very inexpensive and simple structure. It can be performed.

Further, by disposing the high voltage terminals of the two high voltage transformers so as to face each other and operating the two high voltage transformers in opposite phases, it is not necessary to provide an insulation distance between the high voltage terminals of the two high voltage transformers. Parts can be placed efficiently using the narrow space of the electric room.

[Brief description of drawings]

FIG. 1 is a side view of a high frequency heating apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a wind flow of the high-frequency heating device.

FIG. 3 is a diagram showing a state in which a high-voltage transformer is removed from the side view of FIG.

FIG. 4 is a front view showing a state where a door of the high-frequency heating device is opened.

FIG. 5 is a view showing an air guide 19 of the high-frequency heating device.

FIG. 6 is a sectional view showing a state in which a part of the air guide 19 is cut.

FIG. 7 is a partial view showing the vicinity of a high-voltage transformer of the high-frequency heating device.

[Explanation of symbols]

3 high frequency oscillator 5 cooling fan 8 vertical dividers 9 Z type partition 10 High voltage transformer 13 Latch switch 14 Resin holder 19 Air guide

Continuation of the front page (56) Reference JP-A-52-67838 (JP, A) JP-A-52-67837 (JP, A) JP-A-61-143631 (JP, A) JP-A-5-89957 (JP , A) JP-A-5-26451 (JP, A) JP-A-1-221887 (JP, A) Actually open 2-98489 (JP, U) Actually open 60-48695 (JP, U) Actually open 58-192307 (JP, U) Actually open 3-130194 (JP, U) Actually open 51-21151 (JP, U) Actually open 2-138893 (JP, U) Actually open 55-166308 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H05B 6/64

Claims (5)

(57) [Claims] 1. A heating chamber for heating food in a main body, a plurality of high frequency oscillators for supplying a high frequency to the heating chamber, a cooling fan for cooling the high frequency oscillator, and a high frequency oscillator. The cooling fan includes a plurality of high voltage transformers for supplying high voltage, a plurality of high voltage condensers, a control electric component, an electric chamber for accommodating the various electric components, and an intake port for sucking cooling air. It is arranged at the rearmost part of the electric chamber in the main body, and the intake port and the intake part of the cooling fan are two intake air passages, that is, an air passage that passes through the lower side of the electric chamber and an air passage that passes through the upper side. It is tied together, and multiple high-voltage transformers and high-voltage condensers are arranged in that order in the lower ventilation passage.
Other control electric components are arranged in series in the upper ventilation passage, the plurality of high-frequency oscillators are arranged between the two intake ventilation passages, and are parallel to each other in the exhaust ventilation passage of the cooling fan. The high-frequency heating device having a structure in which the wind after cooling the high-frequency oscillator is exhausted from the back surface of the main body through the exhaust passage on the back side of the upper intake ventilation passage. 2. A heating chamber for heating food in the main body, a high frequency oscillator for supplying a high frequency to the heating chamber, a heater for heating the heating chamber, and a cooling for cooling the high frequency oscillator. A first fan, an intake port for intake of cooling air, and a first connection between the intake port and the intake part of the cooling fan
Air passage, a second air passage connecting the outlet of the cooling fan and the high-frequency oscillator, a latch switch that opens an electric circuit when the door is opened, and a resin holder that holds the latch switch. The latch switch and the resin holder are located in the first ventilation passage, an opening is provided in a part of the second ventilation passage, and the air leaked from the opening is transferred to the resin holder. A high-frequency heating device with a structure that blows toward you. 3. A heating chamber for heating food in the main body, a high frequency oscillator for supplying a high frequency to the heating chamber, a heater for heating the heating chamber, a cooling fan for cooling the high frequency oscillator, An air guide connecting the high-frequency oscillator and the cooling fan, a semiconductor element such as a triac for controlling the output of the high-frequency oscillator or the heater, and a semiconductor element fixed to the semiconductor element for cooling the semiconductor element. A heat radiating plate made of one metal plate, and a part of the air guide is made of an insulating material partially provided with slit holes, and the heat radiating plate is a part of the air guide made of the insulating material. Fixed to the slit hole,
A high-frequency heating device configured to be inserted into the air guide so as to be parallel to the wind flow. 4. A heating chamber for heating food in the main body, a plurality of high frequency oscillators for supplying high frequency to the heating chamber, one cooling fan for cooling the high frequency oscillator, and the high frequency oscillator. A high-frequency heating device comprising: a plurality of high-voltage transformers for supplying a high voltage, the high-voltage transformers being arranged adjacent to each other so that their high-voltage terminals face each other, and operating the two high-voltage transformers in the same phase. 5. The two high-voltage transformers are arranged adjacent to each other in the front-rear direction so that the coils face each other in the lower intake air passage, and the wind inlet of the lower air passage has a high pressure on the front side. The transformer according to claim 1, wherein the transformer is provided on one core surface side of the transformer.
The high-frequency heating device described.