JPS6344273B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an installation configuration for an abnormal temperature detection device that can constantly detect the outflow of hot air from the heating chamber of a composite cooker to the machine room and the abnormally high temperature of a high-frequency heating device. It is.

Structure of conventional example and its problems Conventionally, this type of composite cooker has been equipped with a cooking button and a cooking button provided on the operating section 19 on the front of the main unit, as shown in FIGS. When the start button is operated, a high voltage is applied from the high voltage transformer to the high frequency generator 8, and the high frequency generated by the high frequency generator 8 is supplied into the heating chamber 1 through the waveguide, and the cooling fan 9 is operated. The high frequency generator 8 is cooled by sucking outside air. The air that has cooled this high-frequency generator 8 is generally discharged from the top or bottom of the main body, but the steam generated from the object to be heated in the heating chamber 1 due to high-frequency heating can be The heating chamber 1 is supplied from the hot air inlet 11 provided on the side wall 10 of the heating chamber through an air guide 12 to prevent dew from being supplied to the heating chamber wall surface.
The steam was supplied to the interior of the heating chamber and discharged together with steam from an exhaust hole 13 provided in the side wall 10 of the heating chamber. In addition, in the case of cooking using an oven, the heat source (electric heater or gas burner) provided in the compartment 3 is operated, and the circulation fan 6 for circulating hot air is rotated. Cooking is performed by repeating the cycle of blowing hot air into the heating chamber 1 from the hot air circulation port 5, heating the object to be heated stored in the heating chamber 1, and sucking it into the compartment 3.

During this oven cooking, if hot air enters the machine room 7 where the high frequency generator 8 and other electrical components are located through the hot air inlet 11 of the heating chamber side wall 10, which is provided to take air into the heating chamber 1 during high frequency heating, it will lead to Since problems such as insulation breakdown of wires and melting of parts may occur, do not install the shutter 1 in the air guide 12.
7 (Fig. 2) and a solenoid 18 that drives this shutter was installed, and the air guide 12 was cut off by the shutter 17 during oven cooking.
The structure was complicated, leading to increased costs.

Therefore, a structure has been considered in which the hot air from inside the heating chamber 1 is prevented from entering by balancing the wind pressure obtained by driving the circulation fan 6 and the cooling fan 9 during oven cooking. If the cooling fan 9 stops for some reason and only the circulation fan 6 rotates, the hot air from the heating chamber 1 enters the machine room 7 through the hot air inlet 11, causing the above-mentioned drawback to occur again. Furthermore, even when hot air is cut off by a shutter, there is a possibility that the shutter structure, the solenoid, or something that controls the solenoid may fail and the air guide 12 may not be cut off. was necessary.

Furthermore, if the cooling fan 9 stops during high-frequency heating or if the cooling fan 9 separates from the motor shaft, the high-frequency generator 8 will not be cooled down and will become abnormally high in temperature due to the heat generated by the oscillation. becomes unable to oscillate.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
The purpose of the present invention is to provide a highly reliable and safe high-frequency heating device that prevents breakdowns and melting of the high-frequency generator and electrical components in the machine room due to abnormal temperature rise.

Structure of the Invention The present invention includes a heating chamber for storing an object to be heated, a compartment adjacent to the heating chamber, a heat source provided in the compartment, and a punching A provided on the wall of the heating chamber. a circulation fan that circulates the air in the heating chamber and the compartment; a high-frequency generator that supplies high-frequency waves into the compartment; a cooling fan that cools the high-frequency generator; and a cooling fan that cools the high-frequency generator. and an air guide that guides the air into the heating chamber through a punching B provided on the side wall of the heating chamber, and when cooking in the oven, the hot air from the heating chamber is controlled by the balance of wind pressure obtained by driving the cooling fan and the circulation fan. In the case of a cooling fan failure in the case of a structure that prevents intrusion, in the case of a shutter mechanism failure in a structure that uses a shutter mechanism to suppress hot air, and also in the case of a cooling fan failure during high frequency heating. , the abnormal temperature detection device attached to the high frequency generator stops the operation of the composite cooking device to ensure safety.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings.

Figure 5 is a cross-sectional view of the main parts of a composite cooker configured to prevent hot air from leaking from the heating chamber by balancing the wind pressure obtained by driving a circulation fan and a cooling fan. This shows the movement of the wind if the fan fails and stops.

In the figure, there is a door 2 provided in the front of a heating chamber 1 that houses an object to be heated, which is openable and closable at the opening of the heating chamber 1 . Reference numeral 3 denotes a compartment adjacent to the rear of the heating chamber 1. An electric heater or gas burner as a heat source (not shown) is installed in this compartment 3, and a hot air circulation port ( Punching A)5 is provided. Reference numeral 6 denotes a circulation fan provided in the compartment 3, which circulates air heated by a heat source in the compartment 3 between the heating chamber 1 and the compartment 3 through the hot air circulation port 5. During normal oven cooking, air flows as shown in Figure 3, and the air from the machine room 7 and the air from the heating chamber 1 are kept in balance at the hot air inlet (punching B) 11 provided on the side wall 10 of the heating chamber. Therefore, hot air does not enter the machine room 7. However, when the cooling fan 9 that cools the high-frequency generator 8 stops, the air that has cooled the high-frequency generator 8 during high-frequency heating is normally sent from the hot air inlet 11 provided on the side wall 10 of the heating chamber to the heating chamber 1. , the hot air enters the machine room 7 via the air guide 12.

In addition, hot air also leaks from another outlet 13 provided on the wall of the heating chamber to discharge steam generated in the heating chamber 1 during high-frequency heating, so the rate of hot air entering the machine room 7 is not so fast. The air enters along the wall surface of the air guide 12, hits the partition plate 14 provided in the ventilation path, passes through the high frequency generator 8, and gradually increases the temperature of the machine room 7. In addition, since the partition plate 14 is attached to the high frequency heating device 8,
During normal operation, the passage of cooling air from the high-frequency heating device 8 is blocked, but since it is located close to the cooling fan 9, the wind pressure is high and there is little deterioration in cooling. However, it is desirable that the partition plate 14 be less than half the width of the high frequency generator 8.

In this embodiment, as shown in FIG. 6, an abnormal temperature detection device (hereinafter referred to as a thermal limiter) 15 is attached to the partition plate 14, and this thermal limiter 15 is inserted into the power supply circuit of the composite cooking device. has been done.

Next, the operation of the thermal limiter 15 will be explained.

The hot air leakage of the composite cooker is as described above, and according to this embodiment, the hot air flowing out from the heating chamber 1 flows along the wall surface of the air guide 12.
Since it hits the partition plate 14 provided in the high frequency generator 8, the temperature of the partition plate 14 rises, the temperature of the sensitive part of the thermal limiter 15 attached thereto also rises, and finally the power supply circuit of the complex cooking device is opened, and all functions including the heat source provided at the rear of the heating chamber 1 are stopped.

Furthermore, if the cooling fan 9 that cools the high-frequency generator 8 during high-frequency heating stops, the high-frequency generator 8 will reach an abnormally high temperature, and the partition plate 14 attached to the high-frequency generator 8 will also rise due to heat conduction. Once warmed up, the thermal limiter 15 opens the power to the composite cooker and stops all functions including oscillation, as described above.

However, the operating temperature of the thermal limiter 15 is the normal operation of the composite cooker, for example, when cooking in an oven, the load is placed in the heating chamber 1 at the highest setting temperature, and when the load is not placed in the heating chamber 1 during high-frequency heating. So you have to set it to a temperature where it won't work.

Therefore, the present invention provides one thermal limiter 15.
This can prevent overheating of the machine room 7 due to hot air leaking from the heating chamber 1 during oven cooking and abnormally high temperature of the generator during high frequency heating.

Effects of the Invention As described above, according to the present invention, by attaching a partition plate of the ventilation passage to the high frequency generator and attaching a thermal limiter to the partition plate, abnormal high temperature and high frequency in the machine room during oven heating can be prevented. Because it can detect abnormally high temperatures in the heating device, the thermal limiter can be shared, reducing the number of parts.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the main part of a conventional composite cooker during high-frequency heating, Figure 2 is a cross-sectional view of the main part of the same cooker during oven cooking, and Figure 3 is a cross-sectional view of the main part of the same cooker during oven cooking. FIG. 4 is a perspective view of the exterior of the main part showing the air guide portion of the cooling fan, and FIG. 5 is a cross-sectional plan view of a composite cooking device according to an embodiment of the present invention. 6 are external perspective views of the same high-frequency generator. 1...heating chamber, 3...compartment, 5...hot air circulation port, 6...
Circulation fan, 7... Machine room, 8... High frequency generator,
9... Cooling fan, 11... Hot air inlet, 12... Air guide, 14... Partition plate, 15... Thermal limiter (abnormal temperature detection device).

Claims (1)

[Claims] 1. A heating chamber that stores an object to be heated, a compartment connected to the heating chamber, a heat source provided in the compartment, and a hot air circulation port provided in the heating chamber wall, into the heating chamber. a circulation fan that circulates air within the compartment; a high frequency generator that supplies high frequency waves into the heating chamber; a cooling fan that cools the high frequency generator; a high voltage transformer that applies high pressure to the high frequency generator; a machine room that houses electrical components such as a high-frequency generator, a cooling fan, and a high-voltage transformer; and an air guide that guides air that has cooled the high-frequency generator into the heating chamber through a hot air inlet provided on the wall of the heating chamber. a partition plate is provided in a ventilation path for air flowing from the heating chamber through the hot air inlet and the air guide into the machine room,
The composite cooking device is configured such that the partition plate is fixed to an outer wall of the high-frequency generator, and an abnormal temperature detection device is further provided on the partition plate to detect outflow of hot air from the heating chamber and abnormal high temperature of the high-frequency generator. .