JPH0463514B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a high-frequency heating device in which food to be cooked placed in a heating chamber is heated and cooked using high-frequency waves.

[Technical background of the invention]

1 to 3 show a conventional high-frequency heating device, for example, a microwave oven, and 1 is an outer box. A door 2 is provided on the front side of the outer box 1, and on the right side of the door 2 is provided an operation section 3 on which a display board, various operation buttons, etc. are provided.
Furthermore, a heating chamber 4 that is opened and closed by a door 2 is provided inside the outer box 1. Inside the heating chamber 4, heat generating portions 5a and 6a of an upper heater 5 and a lower heater 6 are disposed, respectively. These upper and lower heaters 5 and 6 are connected to the heat generating section 5, respectively.
a, 6a and connecting ends 5b, 6b. The connecting end 5b of the upper heater 5 is led out to the rear of the heating chamber 4 through a mounting hole provided in the back plate 7 of the heating chamber 4, and is fixed in a state connected to a lead wire or the like. Further, the connecting end 6b of the lower heater 6 is led out to the rear of the heating chamber 4 through a mounting hole provided in the back plate 7 of the heating chamber 4, and
It is detachably connected to a heater fixture 8 attached to the outer surface of the heater. Furthermore, inside the outer box 1, on the right side of the heating chamber 4 and inside the operating section 3, there is provided a storage chamber 9 for electrical components. A magnetron (high frequency oscillator) 10 is arranged inside this storage chamber 9. The high frequency waves output from the magnetron 10 are guided through a waveguide 11 and introduced into the heating chamber 4 through an excitation port provided in a ceiling plate 12 of the heating chamber 4. Furthermore, storage room 9
Inside the magnetron 10, there are high-voltage electric parts for high-frequency oscillation such as a high-voltage transformer 13, a capacitor 14, and a rectifier 15, a cooling fan 16 for cooling these high-voltage electric parts, and high-voltage electric parts, the fan 16, heaters 5, 6, etc. Various electrical components such as a control electrical component 17 such as a relay, a printed circuit board 18, etc., which control the operation of the circuit board 17, and the like are respectively mounted. In addition, a right side plate 19 is provided on the outside of the right side plate 19 of the heating chamber 4.
A heat shield plate 20 is disposed at an appropriate interval from the heat shield plate 20, and the heat shield plate 20 prevents heat from the heating chamber 4 side from being directly radiated to the storage chamber 9 side. It's summery.

On the other hand, a plurality of suction holes 22 are formed in a rear plate 21 of the outer box 1 at a portion facing the cooling fan 16, and a bottom plate 23 and a side plate 24 of the outer box 1 are formed with a plurality of suction holes 22.
Also, a large number of ventilation holes 25 are formed. Then, by driving the cooling fan 16, the cooling fan 1
Suction holes 22 of the rear plate 21 located at the rear of the rear plate 6, and ventilation holes 25a of the bottom plate 23 and the side plates 24 on the suction side.
After outside air is drawn into the storage chamber 9 through the cooling fan 16, it is blown onto electrical components such as the magnetron 10 and the high voltage transformer 13, which are arranged in front of the cooling fan 16, thereby cooling them. . Further, the cooling air blown onto the magnetron 10 is guided into the heating chamber 4 via the duct 26,
It is used for ventilation in the heating chamber 4, and the remainder is discharged to the outside from the ventilation holes 25b on the exhaust side of the bottom plate 23 and side plates 24 of the outer box 1.

[Problems with background technology]

During cooking using high frequency, the cooling fan 16 is driven, and the cooling air sent out from the cooling fan 16 is widely dispersed within the storage chamber 9. There was a problem with poor cooling efficiency for various electrical parts. Further, the cooling air sent forward from the cooling fan 16 hits the inner surface of the operating section 3 and then flows backward, and a portion of the air flows backward through each ventilation hole 25b on the exhaust side.
The remaining air is discharged to the outside from the cooling fan 16, which causes the problem that the cooling air inside the storage chamber 9 cannot flow smoothly, and the high temperature that flows back inside the storage chamber 9. Since there was a possibility that the hot air would flow again to the suction side of the cooling fan 16, there was a problem that the hot air would circulate inside the storage chamber 9, further deteriorating the cooling efficiency. In addition, ventilation holes 25 were also formed in the side plate 24 of the outer box 1, so
When installing, a large space was required next to the main body of the device, which also had the disadvantage of requiring a large installation space.

[Purpose of the invention]

An object of the present invention is to provide a high-frequency heating device that can increase the cooling efficiency of each electrical component when a cooling fan is driven, and that can require a relatively small installation space.

[Summary of the invention]

A storage room for electrical components is provided at the rear of the heating chamber, and a heat shield is provided on the outside of the back plate of this heating chamber.
A partition plate is provided to divide the interior of the storage chamber into a first storage chamber in which a high-frequency oscillator is installed and a second storage area in which a high-voltage transformer is installed. When the fan is driven, the cooling air sucked in from the inlet provided in the bottom plate of the outer box on the side of the first storage part along the heat shield plate is guided to the first storage part through the ventilation hole. The air is discharged to the outside through an exhaust port provided on the rear plate of the outer box on the side of the storage section.

[Embodiments of the invention]

4 to 9 show an embodiment of the present invention. FIG. 4 shows the external appearance of the microwave oven, and 31 is an outer box. A door 32 is provided on the front surface of the outer box 31, and below the door 32 is provided an operation section 33 in which a display board, various operation buttons, etc. are provided. Also, outer box 3
1 has a heating chamber 3 that can be opened and closed by a door 32.
4 is provided. Inside the heating chamber 34, heat generating portions 35a and 36a of an upper heater 35 and a lower heater 36 are disposed, respectively. These upper heaters 35 and 36 are connected to the heat generating section 35a,
36a and connecting ends 35b, 36b. The connection end 35 of the heater 35
b is led out to the rear of the heating chamber 34 through a mounting hole provided in the back plate 37 of the heating chamber 34, and is fixed to the heater fixture 35c while being connected to a lead wire or the like. Furthermore, the connection end 3 of the lower heater 36
6b is led out to the rear of the heating chamber 34 through a mounting hole provided in the back plate 37 of the heating chamber 34, and
It is detachably connected to a heater fixture 38 attached to the outer surface of the heater. A radio wave absorber 39 such as ferrite is attached around the heater fixture 38. Additionally, a heating chamber 34 is provided inside the outer box 31.
A storage chamber 41 for storing electrical components is formed between the back plate 37 of the outer box 31 and the rear plate 40 of the outer box 31. This storage room 4
1 has a magnetron (high frequency oscillator) 42 inside.
is installed. This magnetron 42 is attached to the base end of a waveguide 43, and the high frequency waves output from the magnetron 42 are guided through the waveguide 43, and the excitation port 44a provided in the ceiling plate 44 of the heating chamber 34 The heating chamber 34 is introduced from the inside of the heating chamber 34. Furthermore, inside the storage chamber 41, a high voltage transformer 45 along with the magnetron 42,
High-voltage electrical components (first electrical components) 4 that generate a large amount of heat and are used for high-frequency oscillation, such as a capacitor 46 and a rectifier 47
8 and a cooling fan 49 that cools these high-voltage electrical components 48 is provided. In addition, heating chamber 3
A heat shield plate (support body) 50 larger than the back plate 37 is disposed on the outside of the back plate 37 of No. 4. This heat shield plate 50 is arranged substantially parallel to the back plate 37 of the heating chamber 34. In addition, as shown in FIG. 9, a plurality of cut and raised pieces 51 are formed on this heat shield plate 50, and these pieces are screwed into place by screws 52 at a predetermined distance from the back plate 37 of the heating chamber 34. The heat shield plate 50 is fixed to the heating chamber 34 via these cut and raised pieces 51. Further, as shown in FIG. 8, the lower end of this heat shield plate 50 is fixed to a plurality of protrusions 54 formed by cutting and raising the bottom plate 53 of the outer box 31 by screws 55. . Therefore, the heat shield plate 50 supports the back plate of the heating chamber 34 and prevents heat from the heating chamber 34 from being radiated to the storage chamber 41 side. In addition, approximately in the center of this storage chamber 41 is a storage chamber 4.
A partition plate (reinforcing member) 58 is arranged to partition the inside of the storage unit 1 into first and second storage portions 56 and 57. This partition plate 58 is arranged approximately perpendicularly to the heat shield plate 50, and one side of this partition plate 58 is located near the heat shield plate 50.
is attached to. Further, the other side of the partition plate 58 is screwed to the rear plate 40 of the outer case 31, and the lower end thereof is screwed to the bottom plate 53 of the outer case 31. Further, a circular ventilation hole 59 is formed in the upper part of this partition plate 58, and a cooling fan 49 is attached by a mounting plate 60 in a state corresponding to this ventilation hole 59. Furthermore, a magnetron 42, a capacitor 46, and a rectifier 47 are arranged inside the first storage section 56, respectively.
A high voltage transformer 45 is disposed inside the second storage section 57. In addition, the high voltage transformer 45 includes the bottom plate 61 of the heating chamber 34, one side plate 62, and the back plate 3.
7 are attached to the bottom plate 53 of the outer box 31 in a state facing the corners to be joined, respectively, and the bottom plate 53 of the outer box 31, one side plate 63 and the rear plate 40
It is placed near the corner formed by.
In this case, a part of the high-voltage transformer 45 is arranged to protrude below the bottom plate 61 of the heating chamber 34, as shown in FIGS. 6 and 7. Therefore, the heat shield plate 50 is formed with an inverted L-shaped water leak prevention part 64 arranged between the upper surface of the high voltage transformer 45 and the corner of the heating chamber 34 . An opening (inlet) 65 is formed below this water leakage prevention part 64 to allow ventilation.

On the other hand, on the bottom plate 53 of the outer box 31 inside the operation section 33, there are control electrical components 66 such as relays that control the operations of the high-pressure air components 48, the fan 49, the heaters 35, 36, etc., and the printed circuit board 67. A second electrical component 68 that generates less heat is provided. Each lead wire of these second electrical components 68 is connected to the heat shield plate 5.
0 through the through hole 69 provided at the bottom of the storage chamber 4.
1 side, and is connected to each high-voltage electrical component 48 in the storage chamber 41. Furthermore, a large number of suction ports 70 are formed in the bottom plate 53 of the outer box 31 at the outer box (front) of the storage chamber 41, and when the cooling fan 49 is driven, cooling is sucked in from these suction ports 70. Wind is introduced from the outside of the storage chamber 41 into the second storage section 57 of the storage chamber 41 through the opening 65,
After cooling the high voltage transformer 45, the magnetron 42 is guided through the ventilation hole 59 to the first storage section 56 side.
It is now possible to spray on A portion of the cooling air blown onto the magnetron 42 is guided into the heating chamber 34 via the duct 71,
The remainder is discharged to the outside from a large number of exhaust ports 72 formed in the rear plate 40 of the outer box.

Further, the rear plate 40 of the outer box 31 is removably attached to the bent edges 53a, 73a of the bottom plate 53 and the ceiling plate 73 by screws 74, respectively.
Furthermore, this rear plate 40 is formed with a recessed part 75 for accommodating some of the electrical components in the storage chamber 41, and by removing the rear plate 40 from the outer box 31,
A portion of the electrical components within the storage chamber 41 are exposed to the outside.

Therefore, in the case of the above-mentioned structure, the cooling fan 49 is driven to rotate when cooking is performed using the high frequency waves output from the magnetron 42. When the cooling fan 49 is driven, cooling air is introduced into the second storage section 57 of the storage chamber 41 through the intake ports 70 and the openings 65 formed in the bottom plate 53 of the outer box 31.
The high voltage transformer 45 is designed to be cooled. The cooling air that has cooled the high voltage transformer 45 is guided along the heat shield plate 50 from the second housing section 57 into the first housing section 56 through the ventilation opening 59. The cooling air introduced into the first storage section 56 is blown onto the magnetron 42, thereby cooling the magnetron 42.
Furthermore, a portion of the cooling air blown onto the magnetron 42 is guided into the heating chamber 34 through the duct 71, and the rest is discharged to the outside from the exhaust ports 72 of the rear plate 40. In this case, the inside of the storage chamber 41 is separated by a partition plate 58 between the first and second compartments.
It is partitioned into both storage parts 56 and 57, and the cooling air is reliably prevented from flowing backward from the first storage part 56 side to the second storage part 57 side. It can flow smoothly into the chamber 41. Furthermore, since the cooling air flows along the heat shield plate 50, it is possible to prevent the temperature of the heat shield plate 50 from rising, and the heat radiated from the heating chamber 34 side to the storage chamber 41 side is transferred to the heat shield plate 50. Therefore, heat can be effectively shielded. Therefore, the cooling efficiency of each electrical component such as the magnetron 42 and the high voltage transformer 45 stored in the storage chamber 41 can be significantly increased. In addition, since the back of the heating chamber 34 can be supported by the heat shield plate 50, there is no need to provide special support legs to support the back of the heating chamber 34 as in the conventional case, and costs can be reduced. can. Furthermore, the partition plate 58 is disposed between the heat shield plate 50 and the rear plate 40 of the outer box 31, and is attached to both at a substantially right angle, so that the heating chamber 3
4 can be further increased, and deformation of the heating chamber 34 can be reliably prevented when an impact force in the front and back direction is applied to the heating chamber 34 due to opening and closing of the door 32 or the like. In addition, since the side plate 63 of the outer box 31 is not provided with ventilation holes as in the conventional case, it is possible to install the device with its side attached to a wall, etc., which saves installation space compared to the conventional method. Can be made smaller.

〔Effect of the invention〕

According to this invention, a storage chamber for electrical components is provided at the rear of the heating chamber, and radiant heat from the heating chamber side to the storage chamber side is shielded by a heat shield plate attached to the outside of the back plate of the heating chamber. At the same time, a partition plate is provided inside the storage chamber to separate a first storage part in which a high-frequency oscillator is arranged and a second storage part in which a high-voltage transformer is arranged, and a partition plate is provided along the heat shield plate. Cooling air is flowed from the side to the first storage part to prevent the temperature of the heat shield plate from rising, and the partition plate also prevents the cooling air from flowing backwards, so when the cooling fan is operated, each electrical component is Cooling efficiency can be increased. Further, since an inlet is provided on the bottom plate of the outer box on the second storage section side, and an exhaust port is provided on the rear plate of the outer box on the first storage section side, the installation space can be reduced. Furthermore, since the back of the heating chamber is supported by the heat shield plate, there is no need to provide a special support member such as a support leg for supporting the back of the heating chamber.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional examples.
The figure is a cross-sectional view of the whole, Figure 2 is a cross-sectional view taken along the - line in Figure 1, Figure 3 is a cross-sectional view taken along the - line in Figure 1, and Figure 4 is a cross-sectional view taken along the - line in Figure 1.
9 to 9 show an embodiment of the present invention, FIG. 4 is a perspective view showing the overall appearance, FIG. 5 is a cross-sectional view of the entire structure, and FIG. 7 is a sectional view taken along the line -- in FIG. 5, FIG. 8 is a perspective view of the main parts, and FIG. 9 is a perspective view showing the state in which the heat shield plate is attached. 31...Outer box, 32...Door, 34...Heating chamber, 37...
Back plate, 40... Rear plate, 41... Storage chamber, 42... Magnetron (high frequency oscillator), 45... High voltage transformer,
49... Cooling fan, 50... Heat shield plate, 53... Bottom plate,
56...first storage section, 57...second storage section, 58
...partition plate, 59...ventilation port, 70...intake port, 72...
…exhaust port.

Claims (1)

[Claims] 1. A heating chamber is provided inside the outer box, and this heating chamber is opened and closed by a door provided on the front surface of the outer box, and a high frequency oscillator that outputs a high frequency wave introduced into the heating chamber, and this high frequency wave In a high-frequency heating device equipped with electrical components such as a high-voltage transformer for driving an oscillator, a storage chamber for electrical components is formed between a back plate of the heating chamber and a rear plate of the outer box, and A heat shield plate is provided to support the heating chamber and prevent heat from the heating chamber from being radiated to the storage chamber, and the inside of the storage chamber is connected to a first storage section in which the high frequency oscillator is disposed and a first storage section in which the high frequency oscillator is disposed. A partition plate is provided to separate the first storage area from the second storage area in which the high-voltage transformer is arranged, and a cooling fan is provided at a ventilation hole provided in the partition plate and communicating between the first and second storage areas. By driving this cooling fan, the cooling air sucked in from the suction port provided in the bottom plate of the outer box on the side of the second storage portion along the heat shield plate is passed through the ventilation port to the first storage portion. Guide it to the storage side,
A high-frequency heating device characterized in that the air is discharged to the outside through an exhaust port provided on a rear plate of the outer box on the side of the first storage section.