JPS5971287A - High frequency heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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, for example, an open range, and 1 is an outer box. This outer box 1
A door 2 is provided on the front of the door 2, and on the right side of the door 2 is an operation section 3 with a display board and various operation buttons.
is provided. Furthermore, a heating chamber 4 that is opened and closed by a door 2 is provided inside the outer box 1. This heating chamber 4
Heat generating portions 5a+6a of an upper heater 5 and a lower heater 6 are respectively disposed inside. The top of these,
The lower heaters 5 and 6 have the heat generating parts 5a and 6a and the connecting end part 5b, respectively.

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. Furthermore, 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 connected to a heater fixture 8 attached to the outer surface of the back plate 7. Connected detachably. 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 this magnetron 10 are guided through a waveguide 11 and are directed to the ceiling plate 1 of the heating chamber 4.
The heating chamber 4 is introduced through an excitation port provided in the heating chamber 2 . Furthermore, inside the storage chamber 9, along with the magnetron 10, a high voltage transformer 13 and a capacitor 14 are provided.
, high-voltage electrical components for high-frequency oscillation such as a rectifier 15, a cooling fan 16 that cools these high-voltage electrical components, and control electrical components 17 such as relays that control the operations of the high-voltage electrical components, fan 16, heaters 5, 6, etc. Various electrical components such as a PC board 18 and a printed circuit board 18 are 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.
This prevents heat from the heating chamber 4 from being directly radiated to the storage chamber 9.

On the other hand, a plurality of suction holes 22 are formed in the rear plate 2 of the outer box 1 at a portion facing the cooling fan 16, and a number of ventilation holes are also formed in the bottom plate 23 and side plates 24 of the outer box 1. 25... are formed. And the cooling fan 16
The rear plate 2 located behind the cooling fan 16 is driven by the
After the outside air is sucked into the storage chamber 9 through the suction holes 22... of the cooling fan 16 and the ventilation holes 25h on the suction side of the bottom plate 23 and the side plate 24, the magnetron is placed in front of the cooling fan 16. 10 and the high-voltage transformer 13, etc., to cool them.

In addition, the cooling air blown to the magnetron 10 is guided into the heating chamber 4 through the duct 26 and is used for ventilation in the heating chamber 4. 23 and side plates 24 on the exhaust side.

[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 in that the cooling efficiency of each electrical component such as the transformer 13 was poor. Furthermore, the cooling air sent forward from the cooling fan 16 hits the inner surface of the operation unit 3 and then flows backward, and a portion of the air flows backward through each ventilation hole 25b on the exhaust side.
is discharged to the outside from the cooling fan 16.
There was a problem in that the cooling air in the storage chamber 9 could not flow smoothly, and there was a risk that the high-temperature warm air flowing backward in the storage chamber 9 would flow again to the suction side of the cooling fan 16. There was also the problem that hot air circulated inside the box, further deteriorating the cooling efficiency.In addition, the side plate 24 of the outer box 1 also had ventilation holes 25.
... was formed, so installation sometimes required a large space next to the main body of the device, and large installations also had the disadvantage of requiring space.

[Purpose of the invention]

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

[Summary of the invention]

A storage chamber 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 separate the first storage area from the second storage area where the transformer is installed, and a cooling fan installed in the ventilation hole of this partition plate is driven to separate the first storage area from the first storage area along the heat shield plate. The cooling air sucked in from the intake port provided on the bottom plate of the outer box is guided to the first storage section through the ventilation port, and the exhaust port provided on the rear panel of the outer box on the side of the first storage section is introduced. It is designed to be discharged to the outside through the pipe.

[Embodiments of the invention]

4 to 9 show an embodiment of the present invention. Figure 4 shows the external appearance of a microwave oven.
is the 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 this heating chamber 34, heat generating parts 358 of an upper heater 35 and a lower heater 36 are provided.
．． 36a are arranged respectively. These upper heaters 35, . 96 is the heat generating part, 95 a + , 96
a and the connecting end 35b.

36b. And the heater 35
The connecting end 95b 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. There is. Further, a connecting end of the lower heater 36, 96
b is led out to the rear of the heating chamber 34 through an attachment hole provided in the back plate 37 of the heating chamber 34, and is detachably connected to a heater fixture 38 attached to the outer surface of the back plate 37.

A radio wave absorber 39 such as ferrite is attached around the heater fixture 38. 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 4o of the outer box 31. This storage room 4
A magnetron (high frequency oscillator) 42 is disposed inside. 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, storage room 41
Inside, there is a high voltage transformer 45 along with a magnetron 42.
, 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 are provided. 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. 9, this heat shield plate 50 has a plurality of cut and raised pieces 51 formed thereon, which are screwed in a predetermined distance from the back plate 37 of the heating chamber 34. 52...
The heat shield plate 5 is inserted through these cut and raised pieces 51...
0 is fixed in the heating chamber 34. Further, as shown in FIG. 8, the lower end of this heat shield plate 50
A plurality of protrusions 54 formed by cutting and raising...
It is fixed by screws 55. However, 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. In fact, the interior of the storage chamber 4 is located approximately in the middle of this storage chamber 41. Partition plate (reinforcing member) 58 partitioning into second storage section 56,57
is located. This partition plate 58 is arranged substantially perpendicularly to the heat shield plate 50, and one side portion of this 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 box 31, and the lower end thereof is screwed to the bottom plate 53 of the outer box 3.

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 4 is provided inside the first storage section 56.
2. A capacitor 46° rectifier 47 is provided, and a high voltage transformer 45 is provided inside the second storage portion 57. In addition, the high voltage transformer 45 is connected to the heating chamber 10.
- 34 bottom plates 61. One of the side plates 62 and the back plate 37 are mounted on the bottom plate 53 of the outer box 3, facing the corners to which they are respectively joined. 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 connected to the bottom plate 6 of the heating chamber 34 as shown in FIGS. 6 and 7.
It is arranged in a state where it protrudes below 1. Therefore, the heat shield plate 50 includes the upper surface of the high voltage transformer 45 and the heating chamber 34.
An inverted water leakage prevention portion 64 is formed between the corner portion of the water leakage prevention portion 64 and the corner portion of the water leakage prevention portion 64 .

An opening (inlet) 65 is formed below this water leak prevention part 64 to allow ventilation.

On the other hand, high-voltage electrical components 48. A control electrical component 66 such as a relay that controls the operation of the fan 49° heater 35, 36, etc., and a second electrical component 68 that generates a small amount of heat such as a printed circuit board 67 are provided. Each lead wire of these second electrical components 68 is led out to the storage chamber 4 side through a through hole 69 provided at the lower part of the heat shield plate 50, and is connected to each high voltage electrical component 48 in the storage chamber 4. It is connected. Furthermore, the bottom plate 53 of the outer box 3
There are many suction lowers 0 on the outside (front) of the storage chamber 41.
By driving the cooling fan 49, the cooling air sucked from these suction lowers 0 is sent from the outside of the storage chamber 41 through the opening 65 to the second storage of the storage chamber 41. After being introduced into the section 57 and cooling the 45 high-voltage transformers, it is guided through the ventilation opening 59 to the first storage chamber 56 side and is blown onto the magnetron 42. A part of the cooling air blown onto the magnetron 42 is guided into the heating chamber 34 through the duct 71, and the remaining part is sent from a number of exhaust lowers 2 formed on the rear plate 40 of the outer box. It is designed to be discharged to the outside.

In addition, the rear plate 40 of the outer box 31 includes a bottom plate 53 and a ceiling plate 73.
are removably attached to the bent edges 53a, 73a by screws 74, respectively. Further, the rear plate 40 is formed with a recess 75 for accommodating some of the electrical components in the storage chamber 41. By removing the rear plate 40 from the outer box 31, the electrical components in the storage chamber 41 can be removed. A part of it is exposed to the outside.

Therefore, in the above-described structure, when cooking is performed by high frequency waves output from the magnetron 42, the cooling fan 49 is driven to rotate. When this cooling fan 49 is driven, cooling air is introduced into the second storage section 57 of the storage chamber 41 through each suction lower 0 formed in the bottom plate 53 of the outer box 31 and the opening 65. The high voltage transformer 45 is cooled. The cooling air that has cooled the high voltage transformer 45 is guided along the heat shield plate 50 from the second storage section 57 into the first storage section 56 through the ventilation opening 59.

The cooling air introduced into the first storage section 56 is blown onto the magnetron 42, so that the magnetron 42 is cooled. Further, a part of the cooling air blown to the magnetron 42 is guided into the heating chamber 34 through the duct 71, and the remaining part is discharged to the outside from the exhaust lower 2 of the rear plate 40. It has become. In this case, the interior of the storage chamber 4 is separated by a partition plate 58. It is partitioned into both second storage sections 56 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. can flow smoothly into the storage chamber 41. Furthermore, since the cooling air flows along the heat shield plate 5o,
It is also 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 4 side can be effectively shielded by the heat shield plate 50. 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 improved. In addition, since the back of the heating chamber 34 can be supported by the heat shield plate 50, the heating chamber 34 can be
There is no need to provide special support legs to support the back of the patient.
Cost reduction can be achieved. Further, the wind direction plate 58 is arranged between the heat shield plate 50 and the rear plate 40 of the outer box 31.
4- In addition, since they are attached to both sides at substantially right angles, the supporting strength of the heating chamber 34 can be further increased, and impact force in the front and rear direction is applied to the heating chamber 34 when the door 32 is opened or closed. In this case, deformation of the heating chamber 34 can be reliably prevented.

In addition, since the side plate 63 of the outer box 31 is not provided with ventilation holes as in the conventional case, the device can sometimes be installed with the side of the device attached to a wall, etc., making installation easier than in the past. The space used can be reduced.

〔Effect of the invention〕

According to this invention, a storage chamber for electrical components is provided at the rear of the heating chamber, and a heat shield plate attached to the outside of the back plate of the heating chamber shields radiant heat from the heating chamber side to the storage chamber side. A partition plate is provided in 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. Cooling air is flowed toward the storage compartment of No. 1 to prevent the temperature of the heat shield from rising, and the partition plate also prevents the cooling air from flowing backwards, increasing the cooling efficiency of each electrical component when the cooling fan is running. I can do it. 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, it is possible to reduce the wave wave during installation.

[Brief explanation of the drawing]

1 to 3 show a conventional example, where FIG. 1 is a cross-sectional view of the whole, FIG. 2 is a cross-sectional view taken along the line n-■ in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line ■A line sectional view, and FIGS. 4 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. ■ in Figure 5
-■ line sectional view, Figure 7 is the ■-■ line sectional view of Figure 5,
The figure 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, 3
7... Back plate, 40... Rear plate, 41... Storage chamber, 4
2... 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, 20... Intake port, 72... Exhaust port. Applicant's agent Patent attorney Suzue Takehiko-17 = JP-A-59-71287 (7) Procedural amendment 1977'! January 2016: G-8 Kazuo Wakasugi, Early Official of the Patent Office 1, Indication of Case Patent Application Sho F5' (No. 182530 2, Name of Invention High Frequency Heating Device 3, Person Making Amendment Relationship with Case Patent Applicant) (30'?') Tokyo Shibaura Electric Co., Ltd. 4, agent 6, complete text of 7 bundles of 9 books to be amended, clearly written engravings (no melancholy in the contents)

Claims (1)

[Claims] 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 high frequency waves introduced into the heating chamber and drives this high frequency oscillator. In a high-frequency heating device equipped with electrical components such as a high-voltage transformer, 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 the back part of the heating chamber is supported. A heat shield plate is provided to prevent heat from the heating chamber from being radiated to the storage chamber, and the storage chamber is surrounded by a first storage section in which the high-frequency oscillator is disposed and the high-voltage transformer. A partition plate is provided to separate the first and second storage areas, and a cooling fan is provided in the ventilation hole provided in the partition plate to communicate between the first and second storage areas. When the fan is driven, cooling air is sucked in from the suction port provided in the bottom plate of the outer box on the side of the second storage section along the insulation/heating plate, and passes through the ventilation port to the first A high-frequency heating device characterized in that the high-frequency heating device is guided to a storage section and discharged to the outside through an exhaust port provided on a rear plate of the outer box on the first storage section side.