JPS62283593A - Radio 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] 3. Detailed Description of the Invention [Object of the Invention] (Field of Industrial Application) This invention heats with the wind of a cooling fan! The present invention relates to a high-frequency heating device that uses the wind force to drive a starrer fan while ventilating the inside of the room.

(Prior technology) Microwave ovens (high-frequency heating devices) use a cooling fan that cools the electric separate unit to ventilate the heating chamber, and the power of the cooling air is used to generate a star fan housed in a star fan storage chamber on the ceiling of the heating chamber. There is something that drives it.

For this, conventional heating facing the Nada machine room! An air passage to which a cooling fan is connected along the depth direction is installed on the wall, and a heat dissipation part of a magnetron (which oscillates microwaves inside the heating chamber) is inserted in this air passage. The outlet portion is communicated with the heating chamber. Then, a technology is used to divert the cooling air flowing into the heating chamber to the Stara fan storage chamber, and after passing through the magnetron, it is heated! The cooling air that enters the space exhausts steam, oil, etc. from the food to the outside, and the cooling air that also enters the Stara fan storage room rotates the Stara fan and diffuses microwaves.

However, this technique in which the cooling air after passing through the heat radiating section of the magnetron is used in the starvation fan storage chamber has the disadvantage that the amount of air reaching the starvation fan is greatly reduced because a large pressure loss occurs in the heat radiating section. Specifically, the sixth
As shown in the figure, magnetron a has a large diameter anode b in the center, and many cooling fins C...
This structure causes a large pressure loss.

(Problem to be solved by the invention) For this reason, conventionally, in order to secure the Jul amount necessary to drive the Stara fan, there was no choice but to use a fan motor with a large customer base, and the cost was reduced accordingly. It was also becoming expensive.

This invention was made with attention to these problems, and its purpose is to create a high-frequency heating device that can drive an efficient star fan and provide ventilation using a small cooling fan. It is about providing.

[Structure of the Invention] (Means and Effects for Solving the Problems) This invention provides a fan drive which opens into a star fan housing between the magnetron and the cooling fan in an air passage from the cooling fan to the heating chamber through the magnetron. By providing a special blow-off section, the wind flow in front of an obstacle (magnetron) that causes a large pressure loss is diverted to drive the starvation fan.

(Example) The present invention will be described below based on a first example shown in FIGS. 1 to 4. FIG. 2 shows a front sectional view of a microwave oven (high-frequency heating device), and FIG. 3 shows a plan sectional view thereof, where 1 is a main body and 2 is a heating chamber 2 provided in the cabinet 1. A bulging portion 2a having an upwardly convex shape is formed in the earthen wall of the heating chamber 2. Further, on the ceiling side of the heating chamber 2, a partition plate 3 made of, for example, synthetic resin is provided so as to partition the ceiling side, and together with the previously mentioned bulging portion 2a, a star fan accommodation v4 is formed on the ceiling of the heating chamber 2. are doing. And Staraf inside this Starafan containment room 4? A ring 5 is rotatably suspended. Also, on the bottom wall of the heating chamber 2, there is a rectangular bulge 2 with a convex bottom similar to the bulge 2a described above.
b is formed.

On the other hand, due to the arrangement of the heating chamber 2, the space on the right side of the main body 1 constitutes a wire machine v6. An intake lower is provided on the front side of the bottom wall of the main body 1, which is the bottom of the machine room 6. Also, on the bottom wall, in series with the intake lower, a high voltage transformer 8 and a cooling fan 9 (built in a casing 9a) connected to a fan motor 9C to a fan 9b are installed in order. This allows the high voltage transformer 8 to be efficiently cooled by the suction flow of the cooling fan 9. Note that the suction port 9d of the cooling fan 9 faces the high voltage transformer 8.

A 7-gnetron 10 is installed at the center of the upper side wall of the heating chamber 2 facing the machine v6.

As shown in Fig. 4, a triangular duct 11 is connected to the heat dissipation part of the magnetron 1°, on the surface side along the depth direction of the heating chamber 2, and on the opposite rear side. is a rectangular duct 1 that connects the outlet of the cooling fan 9.
2 are joined.

As a result, an air path with a heat dissipation section interposed in the path is formed along the right side wall. In addition, an air outlet 13 that opens into the heating chamber 2 is provided on the right side wall portion of the heating chamber 2 facing the duct 11, and an air outlet 13 that opens into the starch fan storage chamber 4 is provided on the right side wall portion of the heating chamber 2 facing the duct 12. A blower outlet 15 (corresponding to a blower outlet for driving a fan) is provided respectively (all are made of punched holes), and the cooling circle from the cooling fan 9 is divided in front of the magnetron 1o, and the cooling air is distributed inside the heating chamber 2. , Staraf? It is possible to send it to the storage room 4.

Specifically, as shown in FIG. 1, the side portion 3a of the partition plate 3 corresponding to the air outlet 15 and the magnetron 1o is recessed downward in the structure for communicating the starrer fan housing 4 and the duct 12. A structure is used in which the air outlet 15 and the antenna part 10a of the magnetron 10 face the star fan housing chamber 4.

Also, on the left side wall of the heating chamber 2, and in the upper part of the heating chamber 2.

Staraf? Body-side exhaust ports 16 and 17 (consisting of punched holes) are respectively provided in the parts corresponding to the housings 4. Roughly, one external exhaust port is provided on the bottom wall of the main body 1. The cooling air that has been ventilated and driven can be exhausted to the outside through a copper space 18 located on the opposite side of the machine room 6. Also, this external exhaust is directed in the opposite direction to the intake lower (left side). A structure is used that exhausts air in the direction (direction).

Specifically, in the orienting structure, a rectangular bulge 20 is formed on the bottom wall of the main body 1, for example, following the shape of the bulge 2b of the heating chamber 2, which is concave and convex at the bottom. A structure is used in which an external exhaust port 19 is provided in the inclined peripheral W portion of the peripheral wall of the bulging portion 20 at a position opposite to the intake lower, and the cooling air reaching the space 18 is directed to the bulging portion 20. The upright peripheral wall is used to direct air to the opposite side of the intake lower.

Note that the machine v6 and the space 18 mean that the rear surface of the heating v2 is in close contact with the rear surface of the main body 1, and that there is space between the side of the bottom wall of the heating chamber on the machine chamber 6 side and the bottom wall portion of the main body 1 opposite thereto. They are separated by interposing a sealing spacer 21 and further by interposing a sealing spacer 22 between the space 18 m of the heating top wall and the upper wall of the main body 1 facing it. , the cold WIli exhausted into the main body 1 is prevented from flowing back through the main body 1.

However, a microwave oven configured in this way can handle food (
(not shown) is placed in the heating chamber 2. Next, by closing the heating chamber 2 with f124 provided on the front surface of the main body 1 and operating the operating section 25 provided on the front surface of the main body 1, the high voltage transformer 8. Electricity is supplied to devices such as the fan motor 9C17 and the magneto a 10. As a result, microwaves (high frequency waves) are oscillated from the antenna section 10a of the magneton 10 into the star fan housing chamber 4.

Meanwhile, at the same time, outside air flows into the machine v6 from the intake lower by the fan 9b, and becomes cooling air. Here, since the high voltage transformer 8 (a component with a large heat generating layer) is installed between the intake lower and the suction port 9d of the cooling fan 9, the entire high voltage transformer 8 is efficiently heated by the suction flow flowing around the transformer. And it will be sufficiently cooled. Then, the cooling air after cooling is sucked into the casing 9a and blown out into the duct 12. Then, within this duct 12, the flow is divided into a flow toward the magnetron 1o and a flow toward the air outlet 15. The cooling air diverted to the outlet 15 side is
The flow flows into the Stara fan storage chamber 4 and drives the Stara fan 5 (as shown in FIG. 3, StaraFan?).
This will drive the stomach 5a of the patient 5. As a result, the star fan 5 is rotated, and the microwaves oscillated from the magnetron 1o are diffused and evenly irradiated onto the food. However, food is heated.

Further, the cold FA air that has been diverted to the magnetron 10 side passes through the heat dissipation IW 10b of the magnetron 10 and is cooled, and then flows out from the blow-off portion 13 into the heating chamber 2. Then,
Along with the cooling air flowing out from inside the heating chamber 2, steam, oil, etc. generated from the food are quickly exhausted from inside the heating v2. Then, the cooling air that has finished this ventilation flows into the space 18, where the cooling air that has finished driving the stara fan 5! Ifi, the air is then exhausted to the outside from one exhaust port on the outside side of the peripheral wall of the bulging portion 20 in the opposite direction to the intake lower.

Thus, it can be seen that by diverting the cooling air to drive the starvation fan before the magnetron 1o, which causes a large pressure loss, the pressure loss due to the seven magnetrons 10 from the path for driving the starvation fan 5 is reduced. This indicates the flow velocity and I! required to drive the star fan 5 with the small fan motor 9c. A sufficient amount of III is obtained.

Therefore, using the cooling fan 9 with a small capacity, the star fan 5 can be rotated stably and heated at the same time! 2 ventilation can also be established. According to experiments, even if the stacked thickness of the core of the conventionally used fan motor 9c was reduced from 20 mm to 16 mm, better rotation of the star fan 5 than before was obtained. In other words, a small capacity fan motor 9c
And Staraf? It was confirmed that the required mm for driving the engine 5 was secured, contributing to cost reduction compared to conventional methods.

Moreover, since the fan efficiency of the cooling fan 9 is improved by the reduction in pressure loss, the cooling of the high-pressure transformer 8 is not impaired.

Note that the present invention is not limited to the embodiment described above, but may be implemented as a second embodiment shown in FIG.

That is, in the second embodiment, the air outlet 15 and the magnetron 10
A directing plate 27 is installed upright between the antenna part 10a of
ll5a...

[Effects of the Invention J As explained above, according to the present invention, the flow in front of the magnetron, which causes a large pressure loss, is diverted and the starvation flow is diverted. As the pressure loss is reduced, a small fan motor can secure the amount of air necessary to drive the stirrer fan.

As a result, efficient star fan drive and ventilation can be achieved with a small-capacity cooling fan, and costs can be reduced because only a small cooling fan is required.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of this invention,
Figure 1 is a perspective view showing the main part of the wind distribution structure, Figure 2 is a front cross-sectional view of the distribution structure together with the configuration of the high-frequency heating device, Figure 3 is its plan cross-sectional view, and Figure 4 is its side view. 5 is a perspective view showing essential parts of a second embodiment of the present invention, and FIG. 6 is a sectional view showing a magnetron generally used in a high-frequency heating device. 2... Heating chamber, 4... Stara fan accommodation, 5...
・Staraf? 7...Intake port, 9...Cooling fan, 10...Magnetron, 11.12...Duct (
circuit), 13... air outlet, 15... air outlet (air outlet for driving a fan).

Claims (1)

[Claims] a heating chamber in which a starvation fan storage chamber is formed; a starvation fan rotatably housed in the starvation fan storage chamber; an air passage to which a cooling fan is connected, a magnetron interposed in the air passage, and an air outlet for driving the fan provided between the magnetron and the air outlet of the cooling fan and opening into the staff fan storage chamber. A high-frequency heating device comprising: