JPS5971286A - 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, a microwave oven, 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. Further, 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 and 6a of an upper heater 5 and a lower heater 6 are respectively disposed inside. These upper and lower heaters 5 and 6 are connected to the heat generating portions 5m and 6m, respectively, and the connecting end portion 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 while being connected to a lead wire or the like. There is. 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. Also, inside the outer box 1, there is a control section 3 on the right side of the heating chamber 4.
A storage chamber 9 for electrical components is provided inside. 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, a high voltage transformer 13. capacitor 1
4. High-voltage electrical parts for high-frequency oscillation such as the rectifier 15, a cooling fan 16 for cooling these high-voltage electrical parts, high-voltage electrical parts, and fan 16. Control electrical components 17 such as relays that control the operation of heaters 5, 6, etc., and printed circuit board 1
Various electrical parts such as No. 8 are installed respectively. Further, a heat shield plate 20 is disposed on the outside of the right side plate 19 of the cutting edge heat chamber 4 at an appropriate distance from the right side plate 19, and this heat shield plate 20 prevents heat from the heating chamber 4 side. Direct radiation to the storage chamber 9 side is prevented.

[Problems with background technology]

The high voltage transformer 13 for driving the magnetron 10 has approximately 20
Since a high voltage of about 00V is applied, there is a problem in that a strong leakage magnetic field is generated from this high voltage transformer 13. Therefore, during high-frequency heating, the outer box 1, the right side plate 19 of the heating chamber 4, the heat shield plate 20, etc. vibrate due to the leakage magnetic field from the high-voltage transformer 13, and there is a problem that abnormal sounds such as humming sounds are likely to occur. Ta. In addition, the heating chamber 4 is formed by a first component 21 formed by bending a plate material into a U-shape. Bottom plate 22
．． While the left side plates 23 are each formed, the plate materials are
The back plate 7 is formed by the second component 24 which is bent into a letter shape.
．． A ceiling plate 12 was formed, and both the first and second structural members 21 and 24 were joined by means such as spot welding. Therefore, condensate that adheres to each inner wall surface of the heating chamber 4 due to steam generated in the heating chamber 4 during cooking, or water accidentally spilled into the heating chamber 4, etc.
．． From each joint of the second two components 21, 24 to the heating chamber 4
In such a case, the water leaking from the heating chamber 4 may leak to the high voltage transformer 13 mounted on the bottom plate 25 of the outer box 1, and the electrical insulation of the high voltage transformer 13 may deteriorate. It was bad and dangerous.

[Purpose of the invention]

The present invention provides a safe high-frequency heating device that can reduce the generation of abnormal noise during cooking using high-frequency waves, and can also reliably prevent water leaking from a heating chamber from coming into contact with a high-voltage transformer. The purpose is to

[Summary of the invention]

A storage chamber for electrical components is provided between the back plate of the heating chamber formed inside the outer box and the rear plate of the outer box, and a corner where the bottom plate, side plate, and back plate of the heating chamber are respectively joined is provided in this storage chamber. A high-voltage transformer for driving a high-frequency oscillator is installed facing the heating chamber, and a high-voltage transformer is installed on the heat shield plate installed on the outside of the back plate of the heating chamber to prevent heat radiation from the heating chamber side to the storage chamber side. An inverted water leakage prevention part is provided between the top surface of the transformer and the corner of the heating chamber.

[Embodiments of the invention]

4 to 9 show an embodiment of the present invention. FIG. 4 shows the external appearance of a high-frequency heating device, for example, a microwave oven, and 31 is an outer box. A door 32 is provided on the front of this outer box 31, and this door 32
An operation section 33 is provided below, in which a display board, various operation buttons, etc. are arranged. In addition, a door 3 is provided inside the outer box 31.
A heating chamber 34 is provided which is opened and closed by 2. Inside the heating chamber 34, heat generating portions 36a+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 3.
5a.

36a and connecting ends 35b, 36b. The connection end 35b of the upper heater 35 is connected to the heating chamber 34 through a mounting hole provided in the back plate 37 of the heating chamber 34.
It is led out to the rear of the heater mount 35c, and is fixed to the heater fixture 35c while being connected to a lead wire or the like. Furthermore, the connecting end 36b of the lower heater 36 is led out to the rear of the heating chamber 34 through an attachment port provided on the back plate 37 of the heating chamber 34, and is connected to a heater fitting 38 attached to the outer surface of the back plate 37. Connected detachably. A radio wave absorber 39 made of ferrite or the like is attached to the same section of the heater fixture 38. Also, inside the outer box 31, a back plate 37 of the heating chamber 34 and the outer box 31 are provided.
A storage chamber 41 for electrical components is formed between the rear plate 40 and the rear plate 40 . A 7-magnetron (high frequency oscillator) 42 is disposed inside the storage chamber 4.

This magnetron 42 is attached to the base end of a waveguide 43 9 , and the high-frequency waves outputted from the magnetron 42 are guided through the waveguide 43 to an excitation port provided in the ceiling plate 44 of the heating chamber 34 . It is designed to be introduced into the heating chamber 34 from 44a. Furthermore, inside the storage chamber 41, along with the magnetron 42, a high voltage transformer 45, a capacitor 46, and so on are provided. A high-voltage electrical component (first electrical component) 48 that generates a large amount of heat and is used for high-frequency oscillation, such as a rectifier 47, and a cooling fan 49 that cools these high-voltage electrical components 48 are provided. -1' Also, a heat shield (supporting body) SO, which is larger than the back plate 37, is disposed outside the back plate 37 of the heating chamber 34. This heat shield plate 5o is arranged substantially parallel to the back plate 37 of the heating chamber 34. In addition, as shown in FIG. 9, this heat shield plate 50 has a plurality of cut and raised pieces 51 formed thereon, which are screwed at a predetermined distance from the back plate 37 of the heating chamber 34. These cut and raised pieces 51... by 52...
- The heat shield plate 50 is fixed to the heating chamber 34 via 8-. Further, as shown in FIG. 8, the lower end of the 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 with screws 55. . Therefore, by this heat shield plate 50, the heating chamber 34
The back of the housing is supported, and heat from the heating chamber 34 side is prevented from being radiated to the storage chamber 41 side. Moreover, the interior of the storage chamber 41 is located approximately at the center of the storage chamber 41. A partition plate (reinforcing member) 58 is arranged to partition the second storage portions 56 and 57. This partition plate 58 is arranged approximately perpendicularly to the heat shield plate 50, and this partition plate 58
One side of is attached to a heat shield plate 50. Further, the other side of the partition plate 58 is screwed to the rear plate 4° of the outer box 31, and the lower end is screwed to the bottom plate 53 of the outer box 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 respectively disposed, and a high voltage transformer 45 is disposed inside the second housing portion 57. In addition, high voltage transformer 45
are the bottom plate 6 of the heating chamber 34, one side plate 62 and the back plate 3.
The outer box 3 is placed facing the corners to which the parts 2 and 2 are joined.
The bottom plate 53 of the outer box 31 is attached to the bottom plate 53 of the outer box 31.
．． - It is arranged near the corner formed by the side plate 63 and the rear plate 40. In this case, high voltage transformer 45
As shown in FIGS. 6 and 7, a part of the heating chamber 34 is arranged to protrude below the bottom plate 61 of the heating chamber 34. As shown in FIGS. For this reason, the heat shield plate 50 is provided with an inverted water leak prevention portion 64 disposed 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 leak prevention part 64 to allow ventilation.

Part of the 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 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, the bottom plate 53 of the outer box 31
There are many suction lowers 0 on the outside (front) of the storage chamber 41.
), and 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 side of the storage chamber 41. After cooling the high-voltage transformer 45, the air is introduced into the first storage chamber 56 through the ventilation port 59, and is blown onto the magnetro/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 rest is carried out by a large number of exhaust lowers 2 formed on the rear plate 40 of the outer box 3.
・It is designed to be discharged from the outside.

In addition, the rear plate 40 of the outer box 31 includes a bottom plate 53 and a ceiling plate 73.
Screws 74 on the bent edges 53a + 7 J a of
It is removably attached by... moreover,
This rear plate 40 is formed with a concave portion 75 for accommodating some of the electrical components in the storage chamber 4.
By removing 0, a part of the drowsy parts in the storage chamber 41 is exposed to the outside.

Therefore, in the above configuration, the high voltage transformer 45 is housed in the electrical parts storage chamber 41 behind the heating chamber 34.
is the bottom plate 61 of the heating chamber 34, one side plate 62 and the back plate 3
7 are joined together and mounted on the bottom plate 53 of the outer box 31 with the corners facing the strongest mechanical strength, so that no magnetic field leaks from the high voltage transformer 45 during cooking using high frequency. Even if vibration occurs, it is possible to prevent vibration of each wall surface of the heating chamber 34. moreover,
This high voltage transformer 45 is connected to the bottom plate 53 of the outer box 31. The high voltage transformer 45 is formed by one side plate 63 and the rear plate 40 and is located near a corner with high mechanical strength.
It is also possible to prevent each wall surface of the outer box 31 from vibrating due to the leakage magnetic field. Therefore, the high voltage transformer 45
Even when a leakage magnetic field occurs, the outer box 3
1, the heating chamber 34, etc. can be suppressed, and the generation of abnormal sounds such as gurgling sounds can be reduced. Also,
Since the heat shield plate 50 is provided with a water leak prevention part 64 disposed between the top surface of the high voltage transformer 45 and the corner of the heating chamber 34, water leaking from the heating chamber 34 to the outside can be prevented from leaking into the high voltage transformer. 45 can be reliably prevented from contracting the disease.
Electrical leakage due to deterioration of the electrical insulation of the high voltage transformer 45 can be prevented and safety can be improved. Furthermore, the heat shield plate 50
Since the water leakage prevention portion 64 is formed in an inverted shape, it has high mechanical strength and can prevent vibration of the heat shield plate 50.

Note that this invention is not limited to the above embodiments. For example, the water leakage prevention part 64 does not necessarily need to be integrally molded with the heat shield plate 50, and may be attached to the entire heat shield plate 5o, which is a separate member from the heat shield plate 50. Furthermore, it goes without saying that various other modifications can be made without departing from the spirit of the invention.

〔Effect of the invention〕

According to this invention, (a) a suppression transformer is disposed in a storage chamber for electrical components formed at the rear of the heating chamber so as to face a corner formed by a bottom plate, a side plate, and a back plate of the heating chamber; Therefore, it is possible to completely reduce the occurrence of abnormal noise during cooking using high waves, and also to install a heat shield plate placed on the outside of the back plate of the heating chamber between the top surface of the high voltage transformer and the corner of the heating chamber. Since the inverted water leakage prevention portion is provided, it is possible to reliably prevent water leaking from the heating chamber from coming into contact with the high voltage transformer, thereby improving safety.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional examples. Figure 14-1 is an overall cross-sectional view, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a cross-sectional view of Figure 1. ■-■ line sectional view, Figures 4 to 9
The figures show one 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. 6 is a sectional view taken along the line 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, 3
7... Back plate, 40... Rear plate, 41... Storage chamber, 4
2... Madai Tron (high frequency oscillator), 45...
High voltage transformer, 50... heat shield plate, 64... water leakage prevention section. Applicant's representative Patent attorney Suzue Takehiko 15-Yoshi 435- No. 5113 Figure 6 Figure 7 Figure 8 ml Figure 9 Showa 57*11-88 Commissioner of the Japan Patent Office Kazuo Wakasugi Tono 1, case presentation special; ton IB 57 S d2527 No. 2, Name of the invention High-frequency heating device 3, Person making the amendment Relationship to the case Patent applicant (Ko-Tokyo Shibaura Electric Co., Ltd. 4, Attorney 5, Self-company 3 amendment)

Claims (2)

[Claims] (1) An outer box with a door on the front, a heating chamber provided inside the outer box and opened and closed by the door, a high-frequency oscillator that outputs high frequency waves introduced into the heating guide, and the blade opening. A storage chamber for electrical components provided between the back plate of the heat chamber and the rear plate of the outer box, and a storage chamber for electrical components provided at an appropriate interval on the outside of the back plate of the heating chamber from the heat chamber side. A heat shield plate that prevents radiation of heat toward the storage chamber, and the high-frequency waveguide disposed in the storage compartment so as to face corners to which the bottom plate, side plate, and back plate of the heating chamber are respectively joined. The invention is characterized by comprising a high voltage transformer for driving an oscillator, and an inverted water leakage prevention part provided on the heat shield plate and arranged between the upper surface of the high voltage transformer and the corner of the heating chamber. High frequency heating equipment. (2) The high-frequency heating device according to claim (1), wherein the high-voltage transformer is disposed near a corner formed by the bottom plate, side plate, and rear plate of the outer case.