JPS6344274B2 - - 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 by a heater or high-frequency waves.

[Technical background of the invention]

1 to 3 show a conventional high-frequency heating device, such as 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, inside the storage chamber 9, there are high-voltage electrical components for high-frequency oscillation such as a high-voltage transformer 13, a capacitor 14, and a rectifier 15, as well as a cooling fan 16 for cooling these high-voltage electrical components; Various electrical components such as a control electrical component 17 such as a relay that controls the operation of the heaters 5, 6, etc., and a printed circuit board 18 are respectively mounted. Further, a heat shield plate 20 is disposed on the outside of the right side plate 19 of the heating chamber 4 at an appropriate distance from the right side plate 19, and this heat shield plate 20 allows heat from the heating chamber 4 side to be dissipated. Direct radiation to the storage chamber 9 side is prevented. On the other hand, the back plate 7 of the heating chamber 4
As shown in FIG. 4, the upper end of a support leg 21 is fixed to the center of the lower part of the support leg 21 by a means such as a spot weld. The lower end of this support leg 21 is connected to the bottom plate 2 of the outer box 1.
The supporting legs 21 are fixedly engaged with cut-and-raised portions 23 provided on the heating chamber 2, and the back of the heating chamber 4 is supported by the supporting legs 21.

[Problems with background technology]

The support leg 21 that supports the back of the heating chamber 4 has a relatively small horizontal length dimension in order to reduce costs, but even with such a support leg 21, the force acting on the heating chamber 4 increases. , in the downward direction, the heating chamber 4 could be supported with sufficient strength. However, when the force acting on the heating chamber 4 is in the front-back direction, the strength of the support legs 21 is insufficient, and the opening and closing of the door 2 causes the heating chamber 4 and the outer box 1 to move back and forth as shown in FIG. There was a risk of deformation in the direction. In this way, when a force in the longitudinal direction is applied to the heating chamber 4, the strength of the support legs 21 is supplemented by the heat shield plate 20. However, since this heat shield plate 20 was attached to the right side of the heating chamber 4, the supporting strength of the heating chamber 4 was uneven on the left and right sides, and the impact force in the front and rear direction generated when the door 2 was opened and closed was Otherwise, the heating chamber 4 may be deformed into a non-uniform state in the left-right direction due to thermal expansion, and the high frequency waves within the heating chamber 4 may leak to the outside, which is dangerous. In addition, when the door 2 is opened and closed, the front plate of the heating chamber 4 is deformed, and the power supply attached to this front plate is turned on.
- There was a risk that the OFF lock switch etc. would malfunction. Furthermore, since the high-voltage transformer 13, which has a large weight, is installed on the bottom plate 22 of the outer box 1, the bottom plate 22 is deformed due to vibration or falling during transportation, and the high-voltage transformer 13 is damaged due to the deformation of the bottom plate 22. I was also afraid.

[Purpose of the invention]

This invention can prevent the heating chamber and the outer box from deforming even when force is applied to the heating chamber in the longitudinal direction, and there is no risk of high-frequency waves leaking from the heating chamber to the outside. The object of the present invention is to provide a safe high-frequency heating device that can prevent malfunctions, damage, etc.

[Summary of the invention]

A support is fixed approximately parallel to the back plate of the heating chamber formed inside the outer box with a door on the front, and the lower end of this support is fixed to the bottom plate of the outer box. At the same time, one side of the reinforcing member arranged approximately perpendicular to this support is used as a support, the other end is attached to the rear plate of the outer box, and the lower end is attached to the bottom plate of the outer box. It is designed to be installed.

[Embodiments of the invention]

FIGS. 6 to 12 show an embodiment of the present invention. FIG. 6 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. Furthermore, a heating chamber 34 that is opened and closed by a door 32 is provided inside the outer box 31. 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 35.
a, 36a and connecting ends 35b, 36b. The connecting end 35b of the upper heater 35 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 connected to a lead wire or the like to the heater mount 35c. Fixed. Furthermore, the connecting end 36b of the lower heater 36 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 connected to a heater fixture 38 attached to the outer surface of the back plate 37. Connected detachably. This heater fitting 38
A radio wave absorber 39 such as ferrite is attached around the . Further, inside the outer box 31, a storage chamber 41 for electrical components is formed between the back plate 37 of the heating chamber 34 and the rear plate 40 of the outer box 31. Inside this storage chamber 41 is a magnetron (high frequency oscillator).
42 are arranged. 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, there is a high voltage transformer 4 along with a magnetron 42.
5, a capacitor 46, a rectifier 47, and other high-voltage electrical components (first electrical components) 48 that generate a large amount of heat and are used for high-frequency oscillation, and a cooling fan 49 that cools these high-voltage electrical components 48. Further, a heat shield plate (support body) 50 larger than the back plate 37 is disposed outside the back plate 37 of the heating chamber 34 .
This heat shield plate 50 is arranged substantially parallel to the back plate 37 of the heating chamber 34. Further, as shown in FIG. 11, a plurality of cut and raised pieces 51 are formed on this heat shield plate 50, and these pieces are attached to 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. Furthermore, this heat shield plate 50
As shown in FIG. 10, the lower end portions of the outer case 31 are fixed to a plurality of projections 54 formed by cutting and bending the bottom plate 53 of the outer case 31 with screws 55. Therefore, the heat shield plate 50 supports the back of the heating chamber 34 and prevents heat from the heating chamber 34 from being radiated toward the storage chamber 41. Furthermore, a partition plate (reinforcing member) 58 is arranged approximately in the center of the storage chamber 41 to partition the inside of the storage chamber 41 into first and second storage sections 56 and 57, as shown in FIG. This partition plate 58
is arranged substantially perpendicularly to the heat shield plate 50, and one side of the partition plate 58 is attached to the heat shield plate 50. 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. Also,
A circular ventilation hole 59 is formed in the upper part of the partition plate 58, and a cooling fan 49 is attached by a mounting plate 60 so as to correspond to the ventilation hole 59. Furthermore, a magnetron 42, a capacitor 46, and a rectifier 47 are arranged inside the first storage section 56, and the second storage section 5
A high voltage transformer 45 is disposed inside 7. Further, the high voltage transformer 45 is mounted on the bottom plate 53 of the outer box 31 in a state facing the corners where the bottom plate 61, one side plate 62, and the back plate 37 of the heating chamber 34 are joined, respectively. bottom plate 5
3. It is arranged near the corner formed by one side plate 63 and the rear plate 40. 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
An inverted L-shaped water leak prevention part 64 is formed 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 for controlling the operations of the high-voltage electrical components 48, the fan 49, the heaters 35, 36, etc., and a 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 led out to the storage chamber 41 side through a through hole 69 provided at the lower part of the heat shield plate 50, and connected to each high voltage electrical component 48 in the storage chamber 41. ing. Furthermore, a large number of suction ports 70 are formed in the bottom plate 53 of the outer box 31 inside the second storage section 57, and when the cooling fan 49 is driven, the cooling air drawn in from these suction ports 70 is is introduced into the second storage section 57 of the storage chamber 41, cools the high voltage transformer 45, and then opens the ventilation port 5.
9 to the first storage chamber 56 and is blown onto the magnetron 42. 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 directed to the outside through a large number of exhaust ports 72 formed in the rear plate 40 of the outer box 31. It is beginning to be excreted.

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 inside the housing 41 are exposed to the outside.

Therefore, in the case of the above structure, the lower end of the heat shield plate 50 attached to the back plate 37 of the heating chamber 34 is fixed to the bottom plate 53 of the outer box 31, and the heat shield plate 50 allows the heat shield plate 50 to be attached to the back plate 37 of the heating chamber 34. The back part is supported, and one side of the partition plate 58 arranged substantially perpendicular to the heat shield plate 50 is the heat shield plate 50, and the other side is the rear plate 40 of the outer box 31, and the lower end thereof. are fixed to the bottom plate 53 of the outer box 31, respectively, and the strength of the heat shield plate 50 in the front and back direction is reinforced by the partition plate 58 that forms a substantially H shape together with the heat shield plate 50 and the rear plate 40 of the outer box 51. When the door 32 is opened or closed, the heating chamber 34 is
There is no fear that the heating chamber 34 and the outer box 31 will be deformed even if an impact force is applied in the front-rear direction to the housing. Therefore, it is possible to reduce the possibility that the lock switch or the like will malfunction when the door is opened or closed. Furthermore, since the partition plate 58 is disposed at the middle portion inside the storage chamber 41, the force acting on the heating chamber 34 in the front and back direction is applied almost uniformly to the left and right sides. Therefore, even if a force is applied to the heating chamber 34 in the longitudinal direction or thermal expansion occurs, there is no risk that the heating chamber 34 will be deformed unevenly in the left-right direction as in the conventional case. Leakage of high frequency waves within the heating chamber 34 can be prevented. Furthermore, since the mechanical strength at the rear of the heating chamber 34 is increased, the bottom plate 53 of the outer box 31 is less likely to be deformed due to vibration during transportation or when dropped, and damage to the high voltage transformer 45 can be prevented.

In addition, cooling fan 49 is used for heating cooking using high frequency.
When the is rotated, the second inlet of the storage chamber 41 is opened from each suction port 70 formed in the bottom plate 53 of the outer box 31.
Outside air is sucked into the storage section 57 of the high-voltage transformer 45 and rises along the high-voltage transformer 45. Therefore, the high-pressure transformer 45 is cooled by the cooling air taken in from the respective suction ports 70. The cooling air cools the high-voltage transformer 45 and then is blown onto the magnetron 42 from the ventilation port 59 to cool the magnetron 42. Furthermore, a part of the cooling air that has cooled the magnetron 42 flows through the duct 71 into the heating chamber 34. The remainder is discharged to the outside from exhaust ports 72 of the rear plate 40. In this case, the inside of the storage chamber 41 is divided into both the first and second storage sections 5 by the partition plate 58.
6 and 57, and the cooling air is reliably prevented from flowing backward from the first storage section 56 side to the second storage section 57 side. 57 can be smoothly ventilated, and the heat radiated from the heating chamber 34 side is shielded by the heat shield plate 50, so that the cooling efficiency of the high voltage transformer 45 can be significantly improved. can. Furthermore, most of the cooling air sent out from the ventilation port 59 is blown onto the magnetron 42.
2 can also be effectively cooled. 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 support is fixed substantially parallel to the back plate of the heating chamber, the lower end of the support is fixed to the bottom plate of the outer box, and the back of the heating chamber is supported by the support. , one side of the reinforcing member arranged approximately perpendicular to this support is attached to the support, the other side is attached to the rear plate of the outer box, and the lower end of the reinforcing member is attached to the bottom plate of the outer box, and supported by this reinforcing member. By reinforcing the strength of the body in the front-rear direction, even if force is applied to the heating chamber in the front-rear direction, deformation of the heating chamber, outer box, etc. can be prevented, and high-frequency waves from the heating chamber can be prevented. It is possible to prevent leakage, malfunction and damage of each electrical component, and to significantly improve safety.

[Brief explanation of drawings]

Figures 1 to 5 show conventional examples.
The figure is a cross-sectional view of the whole, Figure 2 is a cross-sectional view taken along the line - - of Figure 1, Figure 3 is a cross-sectional view taken along the line - - of Figure 1, and Figure 4 is a cross-sectional view taken along the line -
The figure is a perspective view showing the support structure at the back of the heating chamber.
The figure is a schematic configuration diagram showing a state in which an impact force is applied in the front and back direction of the heating chamber, Figures 6 to 12 show an embodiment of the present invention, and Figure 6 is a perspective view showing the overall appearance. , Figure 7 is a cross-sectional view of the whole, Figure 8 is a cross-sectional view of Figure 7, and Figure 9 is a cross-sectional view of Figure 7.
10 is a perspective view of a main part, FIG. 11 is a perspective view showing a state in which a heat shield plate is attached, and FIG. 12 is a cross-sectional view showing a state in which a partition plate is attached. 31... Outer box, 32... Door, 3... Heating chamber, 37... Back plate, 40... Rear plate, 42... Magnetron (high frequency oscillator), 45... High voltage transformer, 50... Heat shield plate (support body), 53... Bottom plate , 58... Partition plate (reinforcing member).

Claims (1)

[Scope of Claims] 1. An outer box provided with a door on the front, a heating chamber provided inside the outer box and opened and closed by the door, and a high frequency wave that outputs high frequency waves introduced into the heating chamber. an oscillator, a support body disposed substantially parallel to a back plate of the heating chamber, a lower end of which is fixed to the bottom plate of the outer box, and a support body which is fixed to the heating chamber and supports the back part of the heating chamber; and this support body. The reinforcing member is arranged approximately perpendicularly to the outer box, and has a support member on one side, a reinforcing member on the other end attached to the rear plate of the outer box, and a lower end attached to the bottom plate of the outer box. High frequency heating equipment. 2. The reinforcing member is arranged in a storage chamber for electrical components formed at the rear of the heating chamber on a first storage side where a high-frequency oscillator is placed and a second storage side where a high-voltage transformer that drives the high-frequency oscillator is placed. a ventilation passage that also serves as a partition wall for partitioning the storage area and that guides cooling air sucked in from an intake port provided in the bottom plate of the outer box to which the high-voltage transformer is attached to the first storage section when driven by a cooling fan; Claim 1, further comprising a ventilation hole to prevent cooling air from flowing backward from the first storage part side to the second storage part side. High frequency heating device.