JPH07101099B2 - High frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention takes in outside air from a machine room, circulates it in a heating room, and then exhausts it from a main body part on the side opposite to the machine room. The present invention relates to a high-frequency heating device.

(Prior Art) In a horizontal microwave oven (high-frequency heating device), a machine room is formed on one side of the main body adjacent to the heating room, and the machine room is arranged using a cooling fan installed in this machine room. There is one that cools a high-voltage transformer and a magnetron, and then ventilates the heating chamber with cooling air after that.

As shown in FIG. 8, an intake port b is provided on the bottom wall of the machine chamber a, and an exhaust part e formed by an exhaust port is provided on the bottom wall of the body d on the side opposite to the heating chamber c. A structure is used in which the intake port b and the exhaust part e are communicated with the inside of the heating chamber c using an air passage (not shown), and the intake port b, the machine room a, the heating chamber c, and the machine room a The outside air is circulated through the space f and the exhaust portion e in order.

However, in such a circulation structure, although steam, oil, etc. generated from food are certainly exhausted to the outside, they are exhausted downward, and because they are close to the intake port b, the air flow shown in FIG. As indicated by the flow, there is a drawback that the blown air again flows into the machine room a from the intake port b.

(Problems to be Solved by the Invention) When such a situation occurs, the cooling efficiency in the machine room a is deteriorated by that much, and the electric components are affected by heat.

The present invention has been made in view of such a problem, and an object thereof is to provide a high-frequency heating device capable of performing ventilation in a heating chamber while improving cooling efficiency.

[Structure of the Invention] (Means and Actions for Solving Problems) The present invention forms a concave portion having a convex downward on a bottom wall of a main body, and forms an exhaust port for discharging air from the concave portion to the outside. On the peripheral wall of the recess, only the peripheral wall portion on the side opposite to the direction of the intake port is provided so that the wind is directed in the direction opposite to the intake port, and the exhaust unit is configured so that the air that has been ventilated is removed. Discharge in a direction away from the intake port and separate the discharge flow from the suction flow.

(Embodiment) Hereinafter, the present invention will be described based on a first embodiment shown in FIGS. 1 to 6. FIG. 1 shows a front section of a microwave oven (high-frequency heating device), and FIG. 2 shows a plan section thereof, respectively, 1 is a main body, and 2 is a heating chamber 2 provided on the left side of the main body 1. On the upper wall of the heating chamber 2, there is formed a bulging portion 2a which is convex upward. A partition plate 3 made of, for example, a synthetic resin is provided on the ceiling side of the heating chamber 2 so as to partition the ceiling side, and the stirrer fan accommodating chamber 4 is provided on the ceiling portion of the heating chamber 2 together with the bulging portion 2a. I am configuring. A stirrer fan 5 is rotatably suspended in the stirrer fan housing chamber 4. Further, the bottom wall of the heating chamber 2 is also formed with a rectangular bulge 2b having a downward convex shape similar to the bulge 2a.

On the other hand, the arrangement of the heating chamber 2 constitutes the machine chamber 6 in the space on the right side of the main body 1. An intake port 7 is provided on the front side of the bottom wall of the main body 1, which is the bottom of the machine chamber 6. Further, on the bottom wall, a high-voltage transformer 8 and a cooling fan 9 (combining a fan motor 9c with a fan 9b built into a casing 9a) are installed in order on the rear side in parallel with the intake port 7. However, the high pressure transformer 8 can be efficiently cooled by the suction flow of the cooling fan 9. The suction port 9d of the cooling fan 9 faces the high-voltage transformer 8.

A magnetron 10 is installed at the center of the upper side wall of the heating chamber 2 facing the machine room 6. Further, as shown in FIG. 3, a triangular duct 11 is joined to the front portion of the heating chamber 2 in the depth direction on the heat radiation portion of the magnetron 10, and the cooling fan is provided to the rear portion on the opposite side. A rectangular duct 12 that joins the blow-out portion of 9 is joined. As a result, the air passage having the heat radiating portion in the route is formed along the right side wall. The right outlet wall 13 of the heating chamber 2 facing the duct 11 is provided with a blowout port 13 opening into the heating chamber 2, and the right outlet wall of the heating chamber 2 facing the duct 12 is opened to the stirrer fan accommodating chamber 4. Each of the air outlets 15 (including a group of punching holes) is provided to send the cooling air from the cooling fan 9 into the heating chamber 2 via the magnetron 10 and to the stirrer fan housing chamber 4 from before the magnetron 10. I am able to do that.

Specifically, in the structure for connecting the stella fan housing chamber 4 and the duct 12 to each other, as shown in FIGS. 3 and 4, a side portion 3a corresponding to the air outlet 15 of the partition plate 3 and the magnetron 10 is provided. A structure is used in which the blowout port 15 is formed in a downward concave shape so as to face the stirrer fan accommodating chamber 4 together with the antenna portion 10a of the magnetron 10.

Further, on the left side wall of the heating chamber 2 and above the heating chamber 2, main body side exhaust ports 16 and 17 (consisting of a group of punching holes) are provided. Further, an external exhaust portion 19 (corresponding to the exhaust portion of the present invention) is provided on the bottom wall of the main body 1, and the cooling air that has finished ventilation and driving is passed to the outside through the space 18 side opposite to the machine room 6. I am able to exhaust. The external exhaust unit 19 has a structure that exhausts air in a direction opposite to the direction in which the intake port 7 is located (leftward direction).

Specifically, for the structure to be oriented, in the center of the bottom wall of the main body 1,
For example, a rectangular bulging portion 20 (corresponding to the concave portion of the present invention) which is concave and convex downward is formed following the shape of the bulging portion 2b of the heating chamber 2. And, as shown in FIG. 5 and FIG. 6, exhaust ports 19a ... Consisting of slit-shaped openings are formed only on the inclined peripheral wall portion at the position opposite to the intake port 7 in the peripheral wall of the bulging portion 20. Space provided using the structure provided
The cooling air reaching 8 is blown out to the side opposite to the intake port 7 by utilizing the standing peripheral wall of the bulging portion 20.

In the machine room 6 and the space 18, the rear surface of the heating room 2 is the main body 1
Closely to the rear surface of the heating chamber, a spacer 21 for sealing is provided between a side portion of the bottom wall of the heating chamber on the side of the machine chamber 6 and a bottom wall portion of the main body 1 facing the side wall, and further, a heating chamber upper wall. Space
The cooling air exhausted in the main body 1 flows back through the main body 1 by being separated by interposing a sealing spacer 22 between the portion on the 18 side and the upper wall portion of the main body 1 facing the portion. It is supposed not to.

Then, in the microwave oven configured as described above, the dish 23 on which food (not shown) is placed is placed in the heating chamber 2. Then, the heating chamber 2 is closed by the door 24 provided on the front surface of the main body 1,
By operating the operation unit 25 provided on the front surface of the main body 1, the high voltage transformer 8, the fan motor 9c, the magnetron 10 and other devices are energized. As a result, the antenna part 10 of the magneton 10
A microwave (high frequency) is oscillated from a into the heating chamber 2 via the stirrer fan housing chamber 4.

On the other hand, at the same time, the fan 9b causes the outside air to flow into the machine chamber 6 from the intake port 7 and becomes cooling air. Here, the high voltage transformer 8 is provided between the intake port 7 and the suction port 9d of the cooling fan 9.
Since (a component having a large heat generation amount) is installed, the entire high-voltage transformer 8 is sufficiently cooled by the suction flow flowing around the transformer. Then, the cooling air after cooling is the casing
It is sucked into 9a and blown out into duct 12. Then, in the duct 12, the flow is divided into a flow toward the magnetron 10 and a flow toward the air outlet 15. The cooling air that has been diverted to the blower outlet 15 side flows into the stirrer fan housing chamber 4 to drive the stirrer fan 5, and the stirrer fan 5
Drive wings 5a of. As a result, the stirrer fan 5 is rotated, and the microwave oscillated from the magnetron 10 is diffused and the food is evenly irradiated. However, the food is heated.

In addition, the thermal cooling air guided to the magnetron 10 passes through the heat radiating portion of the magnetron 10 to be cooled, and then flows out from the outlet 13 into the heating chamber 2. Then, along with the cooling air flowing out of the heating chamber 2, steam, oil, etc. generated from the food are quickly exhausted from the heating chamber 2. Then, the cooling air that has finished this ventilation is used in the space 18 and the previous stirrer fan 5
It joins with the cooling air that has finished driving, and then reaches the exhaust port 19a of the bulging portion 20.

Here, since the exhaust port 19a is provided in the left side wall portion of the bulging portion 20, the exhaust port 19a is exhausted to the outside in the blowing direction opposite to the direction in which the intake port 7 is located.

However, it can be seen that the blowout flow is separated from the suction flow from the intake port 7 due to the orientation of the blowout direction.

Thus, it is possible to improve the inconvenience that the cooling air whose temperature has risen is sucked in again as it is, and it is possible to always circulate fresh outside air as the cooling air.

As a result, the cooling efficiency of the electric parts such as the high-voltage transformer 8 and the magnetron 10 in the machine room 6 can be improved, and stable operation can be guaranteed.

The present invention is not limited to the above-described embodiment, but may be the second embodiment shown in FIG.

That is, in the second embodiment, the wind direction grill is formed by cutting and raising inward at the upper end of each slit-shaped opening that constitutes the exhaust port 19a.
27 are formed to enhance the directionality of the discharge flow (the direction opposite to the intake port). This structure has the advantage that the directivity of the exhaust gas becomes stronger and the discharge flow and the suction flow can be made independent by that amount.

[Effects of the Invention] As described above, according to the present invention, the discharge flow of exhausted cooling air can be separated from the suction flow toward the intake port, and the cooling air whose temperature has risen remains unchanged. The inconvenience of being sucked again can be improved.

As a result, it is possible to ventilate the heating chamber while increasing the cooling efficiency.

[Brief description of drawings]

1 to 6 show a first embodiment of the present invention,
FIG. 1 is a front sectional view showing the structure of an exhaust part which is a main part together with the structure of a high frequency heating device, FIG. 2 is a plan sectional view thereof, FIG. 3 is a side view thereof, and FIG. FIG. 5 is a rear view showing a recess and an exhaust port which constitute the exhaust unit, and FIG. 6 is a front sectional view of the recess and the exhaust port,
FIG. 7 is a front sectional view showing a main part of a second embodiment of the present invention, and FIG. 8 is a front view showing a passage of cooling air in a conventional high-frequency heating device. 1 ... Main body, 2 ... Heating chamber, 6 ... Machine room, 7 ... Intake port, 9 ... Cooling fan, 11,12 ... Duct, 13,15 ... Blowout port, 19 ... External exhaust Part (exhaust part), 19a ... exhaust port, 20 ... bulging part (recessed part), 27 ... wind grill.

Claims (2)

[Claims] 1. A heating chamber is provided on one side in the left-right direction in the main body, a machine chamber is provided on the other side, an intake port is provided at the bottom of the machine chamber, and an exhaust part is provided on the bottom wall on one side of the main body. In the high-frequency heating device, wherein the intake port and the exhaust unit are communicated with each other through the heating chamber to allow ventilation air to flow in the heating chamber, the exhaust unit has a downward convex portion on a bottom wall of the main body. The exhaust port that forms the recessed portion and discharges the air to the outside from the recessed portion is provided with the air flow in the opposite direction to the intake port only on the peripheral wall portion of the recessed wall on the side opposite to the direction in which the intake port is located. A high-frequency heating device, characterized in that it is provided so as to be directed to. 2. The exhaust port is provided with a wind direction grill for directing the outflowing air to the side opposite to the direction in which the intake port is present. High frequency heating device.