JPS5986191A - High frequency heating device - 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 Field of Industrial Application The present invention relates to a safety device for a high-frequency heating device when the humidity increases abnormally.

Conventional structure and its problems Conventionally, the high frequency heating device 1 has a transformer 2 and a capacitor 3.
The food is heated by irradiating the food with microwaves generated by a power supply component such as a magnetron 4, which enables energy saving and speedy cooking. In addition to the power supply components described above, a time switch 6 for setting the heating time, a fan motor 6 for cooling the power supply components, and the like are provided. Further, consideration has been given to safety by providing an overtemperature rise prevention device 7 for detecting an abnormal temperature rise such as when the cooling fan motor 6 breaks down and turning off the power. At this time, setting the operating temperature of the overtemperature rise prevention device 7 and detecting humidity (of the vessel)
The key point in the design is where to do this, but in the past, it was possible to directly attach it to a part of the magnetron 4 that generates a lot of heat, or to detect the temperature inside the wind passage 8 after the magnetron 4 has been cooled by the fan motor 6. I was doing it. 1)'lJ
Person Q: The temperature setting is relatively high (160-160℃).
The latter is used to protect the magnetron 40 parts, whereas the latter has a relatively low set temperature (1oO~12
0℃), and is installed in a position to protect the parts of the magnetron 4 and to turn off the power even if the heated object in the heating chamber 9 overheats and burns. A prevention device detects multiple abnormal temperature rises to ensure safety.

In other words, the latter has higher added value. However, the settings for operating humidity and detection position are very inappropriate, resulting in malfunctions (the excessive humidity prevention device operates even though it is not a malfunction), and the magnetron 4 malfunctions because it does not do its part to protect components. was often the case.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional technology, and protects the magnetron 4 when the cooling fan motor 6 breaks down and safely prevents abnormal temperatures in the heating chamber 9 by using a common overheat prevention device 7. The purpose is to provide a safety structure that can be designed quickly and easily without malfunction.

Structure of the Invention In order to achieve the above object, the setting structure for preventing excessive temperature rise of the present invention is provided in the passage of the cooling air generated by the fan motor 6 for cooling power supply components and on the intake side 10 of the cooling air from the magnetron.
It has a configuration in which an overheat prevention device 7 is installed in a part of the air path before cooling the magnetron 4. Therefore, an abnormal rise in humidity in the magnetron 4 and heating chamber 9 when the cooling fan motor 6 or the like breaks down is quickly detected by the common overtemperature rise prevention device and the power supply is shut off. Therefore, it is possible to ensure the protection and safety of the parts of the magnetron 4, and also prevent malfunctions (continuous operation under a very light load, or due to extremely high ambient temperatures during use, even if there is no malfunction). The rise prevention device 7 will operate.

) and has stable safety performance.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 5, a magnetron 4 is attached to one wall of a heating chamber 9, and is cooled by a cooling fan motor 6. In addition, in order to improve the cooling performance of power supply components such as the magnetron 4 and transformer 2, an air guide 11 that constitutes an orifice is installed. is inhaled and cools each power supply component. At this time, the wind after cooling the magnetron 4 is introduced into the heating chamber 9 through the wind passage 8.

At this time, in the present invention, the overtemperature rise prevention device 7 is provided closer to the intake hole 10 than the magnetron 4, and the effect of the heat generated by the magnetron 4 is reduced by cooling by the wind when being sucked in by the fan motor 6 or before cooling the power supply components. It has a structure that makes it difficult to receive damage.

The operation of the above configuration will be explained below.

As shown in FIG. 8, when the fan motor 6 is normally cooling the power supply parts, the detection part of the overtemperature rise prevention device 7 is installed at a position where it is less affected by the heat generated by the magnetron 4 (cooling the magnetron). The position where the detection part of the overtemperature prevention device is cooled by the wind before cooling) When the fan motor 6 is rotating, the humidity of the detection part remains low even during light load operation close to dry firing or when the ambient temperature is high. The increase has been kept low. However, if cooling is not performed due to a failure of the fan motor 6, the temperature of the detection unit will rise rapidly.

In addition, even when the object to be heated in the heating chamber 9 burns, the flame of the object to be heated directly touches the wall surface of the heating chamber 9, so even if the cooling fan motor 6 is rotating at this time, due to heat conduction, This is transmitted to the detection section of the overtemperature rise prevention device 7, and the power can be quickly shut off.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) When the cooling fan motor is rotating normally, the temperature of the detection part of the overtemperature rise prevention device will remain at around 40 degrees Celsius even if continuous light load operation or high ambient humidity occurs. ) “There is no malfunction (the humidity setting can be lowered).

).

(2) If an abnormality occurs in the cooling fan motor and the temperature of the magnetron suddenly rises, immediately shut off the fL source to protect the parts.

(3) Even when the object to be heated in the heating chamber burns due to overheating, the power can be quickly shut off due to heat conduction by the flame that directly contacts the walls of the heating chamber.

(4) Easier design and prevention of over-temperature 11. Device I“
It is easy to take account of variations in the set humidity of '1', variations in product implementation/ζ, and fluctuations in the ambient humidity Ω.

(6) It is possible to easily provide a combined and safe humidity overrise prevention structure for the user (because zero abnormal humidity increases are handled by a common humidity overrise prevention device, and the number of parts is reduced).

[Brief explanation of drawings]

Figure 1 is a front view of the high frequency heating device, Figures 2, 3 and 4 are
It shows the detection method of the conventional overtemperature rise prevention device. Fig. 2 is a right side sectional view, Fig. 3 is a top sectional view, Fig. 4 is a right side sectional view, and Fig. 5.6.7 is a main view. An embodiment of the invention is shown, and FIG. 6 is a right side partial sectional view, and FIG. 6 is a top partial sectional view of another embodiment. FIG. 7 is a cross-sectional view of the front part of another embodiment, and FIG. 8 shows the humidity increase in the detection section of the overtemperature rise prevention device.
fL) is during normal operation (when the fan motor is operating normally), (b) is when the cooling fan motor has failed, and (C) is when the heated object is overheated and burned in the heating chamber. be. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure! Figure 2 Figure 3 Figure 4 Figure 6 Figure 7 Figure 8

Claims (3)

[Claims] (1) It has a heating chamber for storing food, power supply components such as magnetrons, transformers, and capacitors that generate high frequency waves, a fan heater that cools the power supply components, and intake and exhaust holes for intake and exhaust of outside air by the fan motor. an outer casing, and an overtemperature rise prevention device for detecting an abnormal temperature rise in electrical components, and the humidity overrise prevention device is installed closer to the intake hole of the outer casing than the magnetron is installed, and the magnetron is A high-frequency heating device installed on one wall that makes up the installed heating chamber. (2) The H'6 frequency heating device according to claim 1, which uses a propeller fan to cool the electrical parts and has an orifice in order to improve cooling efficiency. (3) A patent claim that uses a propeller fan to cool electrical parts, has an orifice to improve cooling efficiency, and is provided with an excessive temperature rise prevention device in the vicinity of the members constituting the orifice and on the wall surface. The high frequency heating device according to item 1.