JPH074790Y2 - Cooling structure of high frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a cooling structure for a high-frequency heating device such as a microwave oven.

<Prior Art> FIG. 10 is a drawing of a microwave oven for explaining a conventional cooling structure of a high-frequency heating device, in which (a) is a front view without a door and (b) is a cabinet top plate. Plan view removed,
(C) is a bottom view, (d) is a right side view excluding the side plate, and the illustrated arrows indicate the passage of cooling air.

The microwave oven 10 is a cabinet 11 having a substantially rectangular parallelepiped appearance.
There is a heating chamber 20 and a power supply unit 30 inside, and a door 11a with a window for opening and closing the heating chamber 20 is provided in the front part of the heating chamber 20 (downward in FIG. 10 (b)), and a power supply unit. An operation unit 11d for selecting a cooking course is provided at the front of 30. 28 is a heating chamber 20
It is the object to be heated placed inside. (Fig. 10 (a),
(B)).

In the power supply unit 30, a magnetron 31 which is a high frequency oscillator,
A high-voltage transformer 32 that generates a high voltage to be applied to the magnetron 31, a high-voltage capacitor 33 provided behind the high-voltage transformer 32, a cooling fan 34 arranged between the magnetron 31 and the high-voltage transformer 32 and the back of the cabinet, and this cooling fan. A fan motor 35 for driving 34 and electric parts such as an oven lamp 36 attached near the window door 11a on the heating chamber top plate 12 are provided (Figs. 10 (b) and (d)).

A partition wall 21 'is provided between the heating chamber 20 and the power source section 30. This partition wall 21' is provided with a heat insulating material (not shown) and a metal plate 22 'forming an inner wall of the heating chamber 20 and a power source. It is sandwiched by a heat shield plate 23 'forming the inner wall of the portion 30 (Fig. 10 (a)).

The cooling structure of the microwave oven 10 includes a cooling fan 34, a fan motor 35, an intake duct 40 ', an intake hole 42, and a steam duct 5.
It has 0 ', exhaust ports 52 and 52a, an exhaust duct 60, an exhaust louver 14 and the like (Fig. 10 (a)).

One end of the intake duct 40 'is attached to the cooling filter of the magnetron 31, and the other end is attached to the partition wall 21'. In the partition wall 21 'where the intake duct 40' is attached, the heating chamber
A first intake hole 42, which is composed of a large number of small holes that communicate the 20 and the intake duct 40 ', is provided.

The steam duct 50 'is provided on the heating chamber top plate 12 from the front part toward the rear part. One end portion of the steam duct 50 'communicates with the heating chamber 20 via a heating chamber exhaust port 51 provided in the heating chamber top plate 12. The other end of the steam duct 50 'is connected to a first exhaust port 52 formed on the upper rear surface of the cabinet 11. In addition, a second exhaust port 52a is provided in the upper rear portion of the cabinet 11 for exhausting the space between the heating chamber top plate 12 and the cabinet top plate 11c. The exhaust ports 52 and 52a open to the first exhaust duct 60. The exhaust louver 14 is provided on the bottom surface of the cabinet 11.

Next, the action of the cooling air in the cooling structure of the microwave oven will be described.

By driving the cooling fan 34, the cooling air flows from the intake hole 11b provided on the rear surface of the cabinet 11 and flows into the cooling fan 3.
Pass 4 A part of the cooling air having passed through the cooling fan 34 becomes the cooling air A and flows into the cooling filter of the magnetron 31 (Fig. 10 (d)).

The cooling air A, which has passed through the cooling filter of the magnetron 31 and cooled the magnetron 31, receives the intake duct 40 ′ and the intake hole 42.
And flows into the heating chamber 20 (see FIG. 10 (a),
(D)).

The cooling air A flowing into the heating chamber 20 becomes high temperature air, passes through the heating chamber exhaust port 51 and flows into the steam duct 50 ',
After passing through the steam duct 50 ', it is discharged from the exhaust port 52 to the outside of the cabinet 11 through the exhaust duct 60 (Fig. 10 (b)).

On the other hand, a part of the cooling air that has passed through the cooling fan 34 becomes the cooling air B and passes near the outside of the magnetron 31 and flows into the space between the heating chamber top plate 12 and the cabinet top plate 11c and the exhaust port 52a. Through exhaust duct 60 to cabinet 11
It is discharged to the outside (Fig. 10 (b), (d)).

Further, a part of the cooling air that has passed through the cooling fan 34 becomes the cooling air C to cool the high-voltage transformer 32, and the cabinet 11
It is discharged to the outside of the cabinet 11 from the exhaust louver 14 provided on the bottom surface (Fig. 1 (c), (d)).

<Problems to be solved by the invention> However, as long as the above cooling structure is adopted,
There are the following problems.

That is, in the microwave oven, the heating chamber needs to be selected to have a predetermined size, but it is desirable that the size of the cabinet be as small as possible. For this reason, the space of the power supply unit is limited and very narrow. Therefore, the passage of the cooling air for cooling the magnetron, the high-voltage transformer, etc. is also narrowed, so that the static pressure of the cooling fan becomes very large and the power consumption of the cooling fan becomes large. In order to reduce this static pressure, it is sufficient to widen the passage of the cooling air, but this increases the size of the cabinet and increases the cost of the microwave oven.

Also, when exhaust gas containing steam passes through the steam duct, water droplets condensed in the steam duct may flow down to the outer surface of the cabinet of the microwave oven. Such a drop of water drops causes a stain on the appearance of the microwave oven. Further, such a drop of water is unsanitary.

The present invention has been made in view of the above circumstances, and has a low static pressure and exhaust temperature of a cooling fan and an excellent cooling effect for a power supply unit, and when exhaust containing steam passes through a steam duct. An object of the present invention is to provide a cooling structure for a high-frequency heating device in which water droplets condensed in a steam duct do not flow down to the outer surface of a cabinet of a microwave oven.

<Means for Solving the Problems> A cooling structure of a high-frequency heating device according to the present invention is provided adjacent to a heating chamber in which an object to be heated is housed and a first partition of the heating chamber. And a cooling fan that cools the high-frequency oscillator and the high-voltage transformer of the power supply unit,
An air intake duct that guides cooling air that has cooled the high-frequency oscillator to the heating chamber, and a steam duct that is provided in a space between the top plate of the heating chamber and the top plate of the cabinet, and that guides the cooling air in the heating chamber to the outside of the cabinet. And a first exhaust duct provided on the outer surface of the cabinet for receiving the cooling air that has passed through the steam duct and the cooling air that has passed through the space. An opening for allowing the cooling air to flow into the space is opened in the upper part, and openings for allowing the cooling air from the space to flow are provided on the side surfaces of the steam duct, respectively, and a bottom surface and an upper surface of the steam duct are provided. A heat insulating plate is provided between them, and a taper that rises rearward from the front part to the rear part is provided on the upper surface, and the first exhaust duct is located above. There has been open.

<Operation> The cooling fan is driven, and the terminal of the cooking heater is cooled by a part of the cooling air flowing into the cooling fan. The cooling air that has passed through the cooling fan is divided into cooling air A that passes through the high-frequency oscillator, cooling air B that passes outside the high-frequency oscillator, and cooling air C that cools the high-voltage transformer.

The cooling air A passes through while cooling the high frequency oscillator, passes through the intake duct, flows into the heating chamber, and flows into the space between the heating chamber top plate and the cabinet top plate through the opening of the intake duct.

The cooling air B passing near the outside of the high frequency oscillator cools a part of the surface of the high frequency oscillator and then flows into the space between the heating chamber top plate and the cabinet top plate.

The cooling air A flowing into the heating chamber becomes high-temperature air due to the heat received from the object to be heated in the heating chamber, flows into the steam duct, and is then discharged to the outside of the cabinet via the first exhaust duct.

The cooling winds A and B that have flowed into the space between the heating chamber top plate and the cabinet top plate are almost mixed in this space, and a part of the mixed cooling air passes through the first exhaust duct and a part of the steam duct. After passing through the upper exhaust duct and the second exhaust duct, the rest flows into the steam duct through the opening of the steam duct, mixes with the hot air in the heating chamber that has flowed into the steam duct, and passes through the first exhaust duct. It is discharged outside the cabinet.

A part of the cooling air C that cools the high-voltage transformer directly cools the surface of the high-voltage transformer, and the other part hits the straightening plate to change the direction downward and cools the high-voltage transformer. It

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.
1 to 9 are drawings of a microwave oven for explaining an embodiment of the present invention. FIG. 1 is an external view showing a schematic structure of a microwave oven and a cooling air path, and FIG.
Is a front view without the door, (b) is a plan view without the cabinet top plate, (c) is a bottom view, (d) is a right side view without the cabinet side plate, and FIG. 2 is a view of the intake duct. FIG. 3 is a perspective explanatory view showing the parts, FIG. 3 is a perspective explanatory view excluding the cabinet top plate, FIG. 4 is a perspective explanatory view showing the structure of the steam duct, FIG. 5 is a sectional explanatory view of the steam duct, and FIG. FIG. 7 is an exploded perspective view showing the method of holding the heat insulating material, FIG. 7 is a perspective view showing the arrangement of the current plate, and FIG. 8 is a perspective view of a duct formed by an extension of the intake duct and a heat shield plate. FIG. 9 is an explanatory plan view showing the arrangement of partition plates. In the following description, the same components as those in the conventional art will be designated by the same reference numerals.

The main structure of the microwave oven as the high-frequency heating device to which this embodiment is applied is the same as the structure described in the related art.

That is, the microwave oven 10 includes the heating chamber 20 in the cabinet 11.
And a power supply unit 30 adjacent to the heating chamber 20. The power supply unit 30 has a magnetron 31, which is a high frequency oscillator, a high voltage transformer 32, and a high voltage capacitor 33. In addition, electric components such as a cooling fan 34, a fan motor 35, and an oven lamp 36 are provided in the cabinet 11. A heating heater 17 is provided in the heating chamber 20,
Further, the object to be heated 28 is stored. The partition wall 21 on the power source side, which is the first partition of the heating chamber 20, is a metal plate that is the inner wall of the heating chamber 20.
22, the heat insulating material 24 (not shown in FIG. 1, see FIG. 6) attached to the entire surface of the metal plate 22 on the power source 30 side, and the heat insulating material 24 provided on the power source 30 side of the heat insulating material 24. And a frame 25 (Fig. 6) holding the. However, a heat shield plate 23 is provided in place of the frame 25 in a part of the partition wall 21 where intake holes 42, 42a and the current plate 26 which will be described later are formed.

The cooling structure of this embodiment includes a cooling fan 34 and a fan motor 3
5, intake duct 40, opening 41 of intake duct 40, duct 27,
Intake holes 42, 42a, steam duct 50, steam duct 50
Opening 53, heat insulating plate 54 in steam duct 50 ', exhaust port 5
2, 52a, exhaust ducts 60, 60a, a heat shield plate 23, a current plate 26, a partition plate 13, an exhaust louver 14, and the like. Hereinafter, the cooling structure will be sequentially described.

As shown in FIG. 2, the intake duct 40 is connected to the magnetron 31.
And a partition wall 21 on the power source side of the heating chamber 20. The intake duct 40 has an outer side plate 40a and a bottom plate 40b. One edge of the outer plate 40a is the outer surface 3 of the magnetron 31.
It is fixed to 1a and the other end is fixed to the partition wall 21. The upper edge of the outer side plate 40a projects above the heating chamber top plate 12 and is in contact with the cabinet top plate 11c. Bottom plate 4
0b is the outer plate 40a, the cooling filter outlet 3 of the magnetron 31.
The lower surface of the space surrounded by the three members 1b and the partition wall 21 is formed. The partition wall 21 forming this space is provided with a first intake hole 42 composed of a large number of small holes. Further, unlike the conventional case, the upper surface of this space is opened to form the opening 41, so that this space is continuous with the heating chamber top plate 12. Therefore, the cooling air A passing through the magnetron 31
Since the flow path resistance is less than in the conventional case, the static pressure of the cooling fan 34 can be reduced. Reference numeral 43 is a guide for cooling air that passes through the intake duct 40 and flows into the space 15 between the heating chamber top plate 12 and the cabinet top plate 11c (hereinafter referred to as a space between top plates) 15 from the opening 41, and the outer plate 40a. The upper part of the above is extended on the heating chamber top plate 12.

As shown in FIGS. 3 to 5, the steam duct 50 is provided on the left side (the left side in FIG. 3) of the space 15 between the top plates. The bottom surface of the steam duct 50 is formed by the heating chamber top plate 12, the both side surfaces are formed by the outer plate 50a and the inner plate 50b, and the upper surface is formed by the upper plate 50c. The upper plate 50c is formed to have a taper that rises rearward from the front portion toward the rear portion. In other words, the space between the upper plate 50c of the steam duct 50 and the cabinet top plate 11c is formed so as to become smaller from the front to the rear (see FIG. 5). The upper plate 50c of the steam duct 50 is formed in this manner so that the warm air in the space 15 between the top plates passes over the top plate 12 of the steam duct 50 and easily flows into the exhaust duct 60a described later. This is because.

On the bottom surface of the steam duct 50, that is, on the front part of the heating chamber top plate 12, there is provided a heating chamber exhaust port 51 which communicates the steam duct 50 with the heating chamber 20 and has a large number of small holes. The rear end of the steam duct 50 is connected to the upper rear part of the cabinet 11, and this upper rear part of the cabinet 11 has a first exhaust port.
52 are provided. In the rear part of the inner plate 50b of the steam duct 50, an opening 53 is formed by cutting out the inner plate 50b in the vicinity of the exhaust port 52. Further, a second exhaust port 52a for exhausting the cooling air that has flowed into the space 15 between the top plates is provided in a substantially central portion of the upper rear surface of the cabinet 11.

A heat insulating plate 54 is attached between the upper plate 50c of the steam duct 50 and the heating chamber top plate 12 except for the portion where the heating chamber exhaust port 51 is provided. This is the heating chamber 20
This is to prevent the high temperature air flowing in the steam duct 50 from directly contacting the heating chamber top plate 12 and raising the exhaust temperature because the temperature of the exhaust gas reaches around 300 ° C.

The first exhaust duct 60 is attached to the upper rear part of the cabinet 11, and the exhaust ports 52, 52 are provided in the exhaust duct 60.
a is open. In addition, a second partition wall (a partition wall on the side opposite to the power supply unit) 21 a facing the partition wall 21 of the heating chamber 20 and the cabinet 11
A space from the lower part to the upper part of the microwave oven 10 is provided between the space and the second exhaust duct 60.
forming a. The upper portion of the exhaust duct 60a is open above the steam duct 50. That is, it communicates with the space 15 between the top plates. The lower part of the exhaust duct 60a communicates with the exhaust louver 14 which is a third exhaust port provided at the bottom of the cabinet 11. Therefore, the warm air in the space 15 between the top plates is discharged not only from the exhaust duct 60 but also from the exhaust duct 60a, so that the flow resistance of the discharge path of this warm air is reduced, and the static pressure of the cooling fan 34 is reduced. Is reduced.

The partition wall 21 on the power source side of the heating chamber 20 is, as shown in FIG.
The heat insulating material 24 is mounted on the frame 25, and the frame 25 is mounted on the metal plate 22 so that the heat insulating material 24 contacts the metal plate 22 which is the inner wall of the heating chamber 20. The cut-and-raised parts 25a provided near both ends of the upper end of the frame 25 are for fixing the frame 25 by inserting the frame 25 into the opening 26 provided in the heating chamber top plate 12 or the like. Further, such a structure using the frame 25 of the partition wall 21 is not limited to the partition wall 21 on the power source side of the heating chamber 20, but the entire outer wall of the heating chamber 20, that is, the top plate, the floor and all the partition walls. Applied to.

As shown in FIG. 7, the partition 21 on the power source side of the heating chamber 20, which is substantially diagonally above the high voltage transformer 32, is left as the heat shield plate 23 without the frame 25 as described above. ,
The heat shield plate 23 is cut and raised to form a rectifying plate 26 having a predetermined size. The rectifying plate 26 is a magnetron 31 and a high voltage transformer.
Since it is located between the high-voltage transformer 32 and the rectifying plate 26, the cooling air C above the high-voltage transformer 32 hits the rectifying plate 26 and moves downward. The direction is changed to cool the high voltage transformer 32.

As shown in FIG. 8, the partition wall 2 of the outer side plate 40a of the intake duct 40
Extend the edge part on the 1 side, and the outer plate 4 of this extended part
A duct 27 is formed by 0a and the heat shield plate 23. Only the surface of the duct 27 on the intake duct 40 side and the surface on the heat shield plate 23 side are open, and the other surfaces are closed. A second intake hole 42a similar to the intake hole 42 is provided in the partition wall 21 where the duct 27 is formed. Therefore, since the intake duct 40 communicates with the heating chamber 20 through both the exhaust holes 42 and 42a, the flow resistance of the cooling air A passing through the magnetron 31 is reduced, and the cooling fan is cooled. Static pressure of 34 decreases.

Next, the partition plate 13 will be described. The cooking heater 17 shown in FIG. 9 is provided in the upper portion of the heating chamber 20, and the terminal 18 of the cooking heater 17 has a partition wall 21b at the rear of the heating chamber 20 and an upper right side (the first (Fig. 1 (b) right side)
It is provided substantially on the side of the cooling fan 34. The rear surface of the cabinet 11 and the partition plate 13 that is bent and formed in a substantially L shape in plan view surrounds the terminal 18 from three sides.
Is attached. An intake port 11b (not shown in FIG. 9) is formed on the rear surface of the cabinet 11 not only in the rear portion of the fan motor 35 but also in the rear portion of the terminal 18. Therefore, the cooling effect of the cooling fan 34 is increased and the terminal 18 of the cooking heater 17 can be cooled.

Next, the cooling operation of the cooling structure of this embodiment will be described.

At the same time when the operation of the magnetron 31 is started, the fan motor 35 is started and the operation of the cooling fan 34 is started. After cooling the terminal 18 of the heater 17 in a part of the cooling air flowing from the intake hole 11b, the other part directly flows into the cooling fan 34. The cooling air passing through the cooling fan 34 is divided into a cooling air A passing through the magnetron 31, a cooling air B passing outside the magnetron 31, and a cooling air C cooling the high-voltage transformer 32.

The cooling air A passes through the cooling filter of the magnetron 31 to cool the magnetron 31, then flows into the intake duct 40, passes through the intake holes 42 and 42a, and flows into the heating chamber 20, and the opening of the intake duct 40 is also formed. It flows from 41 to the space 15 between the top boards.

The cooling air B that has passed near the outside of the magnetron 31 is
After cooling a part of the surface of the magnetron 31, it flows into the space 15 between the top plates.

The cooling air A flowing into the heating chamber 20 becomes high-temperature air due to the heat received from the object 28 to be heated in the heating chamber 20, passes through the heating chamber exhaust port 51, and flows into the steam duct 50.

The cooling sides A and B that have flowed into the space 15 between the top plates are almost mixed in this space, part of the mixed cooling air passes through the exhaust port 52a and the exhaust duct 60, and part of it is above the steam duct 50. After passing through the exhaust duct 60a and the exhaust louver 14, the rest flows into the steam duct 50 through the opening 53 of the steam duct 50 and is exhausted while being mixed with the hot air in the heating chamber 20 flowing into the steam duct 50. Mouth 52 and exhaust duct 60
And then discharged to the outside of the cabinet 11.

A part of the cooling air C that cools the high-voltage transformer 32 directly cools the surface of the high-voltage transformer 32, and another part of the cooling air C hits the straightening plate 26 and changes its direction downward to cool the high-voltage transformer 32. The cooling air C that has cooled the high-voltage transformer 32 is discharged from the exhaust louver 14 provided on the bottom surface of the cabinet 11.

<Effect of the Invention> The cooling structure of the high-frequency heating device according to the present invention has the following effects.

Since the opening is provided in the upper part of the intake duct to allow the cooling air for cooling the magnetron to flow not only into the heating chamber but also into the space between the top plates, the static pressure of the cooling fan can be reduced. Therefore, the static pressure of the cooling air that has passed through the high-frequency oscillator becomes low, so that the cooling effect of the high-frequency oscillator can be enhanced.

To the hot air that has flowed into the steam duct from the heating chamber,
Since the cooling air that has flowed into the space between the heating chamber top plate and the cabinet top plate is merged through the openings provided in the steam duct, the exhaust temperature can be lowered. Therefore, the safety in using the high frequency heating device is improved.

A heat insulating plate was provided in the steam duct to prevent the high temperature air flowing in the steam duct from directly contacting the heating chamber top plate, which allows the exhaust temperature to be lowered, which is important when using a high frequency heating device. The safety of is improved.

The shape of the steam duct is formed so that it has a taper that rises from the front to the rear, and the cooling air in the space between the heating chamber top plate and the cabinet top plate is directed to the opposite side of the cabinet and heating chamber. Since the air is introduced into the exhaust duct formed between the partition walls and then discharged, the partition wall on the side opposite to the power supply section of the heating chamber is cooled, and the surface temperature of the cabinet is lowered.

In the structure that insulates the heating chamber, rather than fixing the heat insulating material by completely covering the outside of the heat insulating material with a metal heat shield plate, the heat insulating material is fixed by a metal frame,
Radiant heat on the outer surface of the heat insulating material can be reduced, and the use of a frame saves material compared to a heat shield.

A heat shield is used for part of the partition wall on the power supply side of the heating chamber.
By cutting and raising the heat shield plate to form the rectifying plate above the high voltage transformer, the cooling effect of the high voltage transformer can be improved, and the number of parts can be reduced as compared with the case where the rectifying plate is provided independently.

In addition to the conventional intake hole that connects the intake duct to the heating chamber, a duct formed by an extension of the intake duct and a heat shield plate is provided, and an intake hole that connects this duct to the heating chamber is provided in the partition wall of the heating chamber. It was That is, since the area of the intake hole of the heating chamber is increased, the static pressure at the filter outlet of the high frequency oscillator is reduced, and the cooling effect of the high frequency oscillator can be enhanced. Further, since the cooling air can be blown into the heating chamber over a wide range, the temperature inside the heating chamber becomes uniform.

A partition plate that encloses the terminals 18 of the cooking heater 17 together with the cabinet from three sides is provided in front of the cooling fan, and the intake holes of the cooling fan are also provided in this part of the cabinet to increase the suction area, so that the terminals 18 are cooled well. In addition, the capacity of the cooling fan is increased and a space-saving design is possible.

Also, when exhaust containing steam passes through the steam duct, water droplets containing impurities such as oil condense in the steam duct, but the upper surface of the steam duct is formed as a taper that rises backward from the front to the rear. Since it has been
Water drops will not leak outside the cabinet. Further, even if water droplets are condensed on the first exhaust duct, the water droplets are received by the first exhaust duct that is open only at the upper side, so that the water droplets do not flow down to the outer surface of the cabinet of the microwave oven. Therefore, the outer surface of the cabinet is not contaminated by water drops, which is hygienic.

[Brief description of drawings]

1 to 9 are drawings of a microwave oven for explaining an embodiment of the present invention. FIG. 1 is an external view showing a schematic structure of a microwave oven and a cooling air path, and FIG.
Is a front view without the door, (b) is a plan view without the cabinet top plate, (c) is a bottom view, (d) is a right side view without the cabinet side plate, and FIG. 2 is a view of the intake duct. FIG. 3 is a perspective explanatory view showing a portion, FIG. 3 is a perspective explanatory view excluding a cabinet top plate, FIG. 4 is a perspective explanatory view showing a configuration of a steam duct, FIG. 5 is a cross sectional explanatory view of the steam duct, and FIG. FIG. 7 is an exploded perspective view showing the method of holding the heat insulating material, FIG. 7 is a perspective view showing the arrangement of the current plate, and FIG. 8 is a perspective view of a duct composed of an extension of the intake duct and a heat shield plate. FIG. 9 is an explanatory plan view showing the arrangement of partition plates. FIG. 10 is a drawing of a microwave oven for explaining a conventional cooling structure of a high frequency heating device, (a) is a front view without a door, (b) is a plan view without a cabinet top plate, (C) is a bottom view,
(D) is a right side view without a side plate. 10 …… microwave oven, 11 …… cabinet, 12 …… heating chamber top plate, 13 …… partition plate, 15 …… space between top plates, 17 …… heating heater, 18 …… terminals, 20 …… heating chamber , 21, 21a ……
Partition wall, 23 ... Heat shield, 24 ... Insulation material, 25 ... Frame, 26 ......
Rectifier 27, duct, 30 power supply, 31 magnetron, 32 high voltage transformer, 34 cooling fan, 40
Intake duct, 41 …… Opening, 42, 42a …… Intake hole, 50 ……
Steam duct, 51 ... Heating chamber exhaust port, 52, 52a ... Exhaust port, 53 ... Open hole, 54 ... Insulation plate, 60, 60a ... Exhaust duct.

Claims (1)

[Scope of utility model registration request] 1. A heating chamber for accommodating an object to be heated, a power supply unit provided adjacent to the heating chamber via a first partition of the heating chamber, a high frequency oscillator of the power supply unit and a high voltage transformer. A cooling fan for cooling, an air intake duct that guides the cooling air that has cooled the high-frequency oscillator to the heating chamber, and a space provided between the heating chamber top plate and the cabinet top plate are provided for cooling air inside the heating chamber. In a cooling structure of a high-frequency heating device, comprising: a steam duct that leads to the outside of the cabinet; and a first exhaust duct that is provided on the outer surface of the cabinet and that receives the cooling air that has passed through the steam duct and the cooling air that has passed through the space. An opening for allowing the cooling air to flow into the space is formed in an upper portion of the intake duct, and an opening for allowing cooling air from the space to flow in is provided on a side surface of the steam duct. A heat insulating plate is provided between the bottom surface and the upper surface of the steam duct, and the upper surface is provided with a taper rising rearward from the front part to the first exhaust duct. Is a cooling structure for a high-frequency heating device, which is open only at the top.