JPS5815763Y2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-frequency heating device equipped with a control mechanism that automatically and properly heats an object to be heated.

In high-frequency heating devices such as microwave ovens, this method detects the heating state of the object to be heated and automatically controls the heating.
BACKGROUND ART Conventionally, a method has been considered in which the temperature of an object to be heated is indirectly detected by detecting the temperature (residue or humidity) of air discharged from a heating chamber.

FIG. 1 shows a conventional example of a high frequency heating device using the above method.

In Figure 1, 1 is a heating chamber, 2 is an object to be heated, 3 is a non-ventilated door, 4 is a saucer, 5 is an intake sensor that detects the temperature of the air entering the heating chamber, and 6 is an air exiting from the heating chamber. An exhaust sensor detects the temperature of the wind, 7 is a high frequency oscillation tube directly connected to the heating chamber, and 8 is a fan for cooling the high frequency oscillation tube.

9 is a high-frequency heating device intake port, 10 is a heating chamber intake port, 11
12 is a heating chamber exhaust port, and 12 is a high frequency oscillation tube cooling air exhaust port.

A partition plate 13 is used to divide the inside of the heating chamber 1 into a machine room containing the antenna of the high-frequency oscillation tube 7 and a high-frequency agitation volume, and a storage chamber for the heated object 2, and is generally made of non-metallic material and has low high-frequency oscillation. Made of lossy materials.

14 is a power supply device, and 15 is a control device.

The arrows in the figure indicate the direction of the wind.

(Hereafter, the arrow in the figure indicates the direction of the wind.

) Now, when the power supply device 14 operates, the high frequency oscillation tube 7 oscillates, and high frequency power is supplied to the heating chamber 1 to heat the object 2 to be heated.

In addition, the high-frequency oscillation tube cooling fan 8 operates, and as a result, the outside air entering from the high-frequency heating device intake port 9 enters the heating chamber 1 from the heating chamber intake port 10, is guided to the partition plate 13, and is guided from the door 3 side. , flows to the lower side of the heating chamber 1, passes around the object to be heated 2, flows out of the heating chamber 1 from the heating chamber exhaust port 11, passes through the high frequency oscillation tube cooling fan 8, and cools the high frequency oscillation tube 7. , flows out from the high frequency oscillation tube cooling air outlet 12.

Now, as shown in the figure, when the temperature of the outside air entering the heating chamber 1 is detected by the intake sensor 5, and the temperature of the air discharged from the heating chamber 1 is detected by the exhaust sensor 6, as shown in FIG. The intake air (ie, outside air) temperature is approximately constant with respect to the heating time, while the exhaust temperature increases approximately linearly.

By the way, this increase in exhaust gas temperature is caused by the temperature of the air in heating chamber 1 increasing as the object to be heated 2 is heated by the output of high frequency oscillation tube 7. By detecting the difference (approximately equal to the difference), the heating state of the object to be heated can be detected, and the control device 15 can control the high-frequency heating device.

However, in the conventional structure as shown in FIG. 1, the heating chamber exhaust port 11 is located far away from the object to be heated 2, so that the object to be heated 2 warms the heating chamber exhaust port 11. The temperature of the air is lowered, and since the air passage is wide, there is a large proportion of cold air heated by the object 2 to be heated, and the heating chamber exhaust port 11 is provided next to the object 2 to be heated. As a result, the increase in exhaust temperature is small.

Therefore, it is necessary to detect the heating state of the object to be heated 2 by detecting a slight temperature change, which has the drawback that the accuracy of detecting the temperature of the object to be heated 2 is poor and it is difficult to properly heat the object. Was.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional technology by increasing the temperature rise value of the exhaust gas from the heating chamber, and to provide a high-frequency heating device that accurately and automatically controls the degree of heating of the object to be heated. .

In order to achieve the above object, the present invention provides an exhaust port on the partition plate in the heating chamber, connects the exhaust port with a heating chamber exhaust port provided on the wall of the heating chamber with a duct, Increase the temperature rise value of exhaust gas.

Hereinafter, the present invention will be specifically explained using the drawings.

FIG. 3 shows an embodiment of the high frequency heating device according to the present invention.

In FIG. 3, the same parts as in FIG. 1 are designated by the same numbers.

Reference numeral 16 indicates an exhaust port drilled in the partition plate 13, and reference numeral 17 indicates a duct that connects the partition plate exhaust port 16 and the heating chamber exhaust port 11. This duct 17 is preferably made of a non-metallic and high-frequency low-loss material. ! Yes.

When the power supply device 14 operates, the high frequency oscillation tube 7 oscillates, supplies high frequency power to the heating chamber, and heats the object 2 to be heated.

The high-frequency oscillator tube cooling fan 8 operates, and as a result, the outside air entering from the high-frequency heating device intake port 9 enters the heating chamber 1 from the heating chamber intake port 10, is guided to the partition plate 13, and is directed to the □3 side. After flowing downward by stroking the back side of the door 3 and preventing fogging of the non-ventilated door 3, it passes around the object to be heated 2, passes through the exhaust port 16 provided on the partition plate, and the duct 17, Air flows out of the heating chamber 1 from the heating chamber exhaust port 11, passes through the high frequency oscillation tube cooling fan 8 to cool the high frequency oscillation tube T, and flows out from the high frequency oscillation tube cooling air exhaust port 12.

As shown in the figure, the intake sensor 5 detects the temperature of the outside air entering the heating chamber 1, and the exhaust sensor 6 detects the temperature of the air discharged from the heating chamber 1 in front of the high-frequency oscillation tube cooling fan 8. When detected, the tendency of temperature rise of intake air and exhaust gas with respect to heating time becomes similar to that of the conventional example shown in FIG.

FIG. 4 shows the temperature rise characteristics of the exhaust air relative to the intake air when frozen shumai (12 pieces) are used as the object to be heated.

As described above, in this embodiment, (1) Since the exhaust port is provided in the partition plate inside the heating chamber, it is easy to take out the hot air from the object to be heated.

(2) Since the partition plate exhaust port and the heating chamber exhaust port provided on the wall surface of the heating chamber are connected by a duct, it is possible to prevent cold air from entering between them, and the temperature drop in the exhaust gas is small.

For these reasons, the increase in exhaust gas temperature is greater than in the conventional example.

As a result, the accuracy of detecting the temperature of the object to be heated based on the exhaust gas temperature is improved, the object to be heated can be properly heated, and the control device can be simplified and lowered in price.

Next, FIG. 5 is a diagram showing another embodiment of the present invention, and the same parts as in FIG. 1 are designated by the same numbers.

FIG. 5 shows an example in which the partition plate 13 that partitions the inside of the heating chamber is used as part of a duct that connects the partition plate exhaust port 16 and the heating chamber exhaust port 11.

FIG. 6 is a diagram showing an example of the structural diagram of the partition plate in FIG. 5.

The partition plate 13 shown in FIG. 6 forms four surfaces of the duct 170, and the duct 17 can be formed by attaching a flat plate of an appropriate size to the lower surface.

The above explanation has been about the method of detecting the temperature rise of the air discharged from the heating chamber, but the mechanism according to the present invention can also be used to control the degree of heating of the heated object by detecting the humidity of the discharged air. This has the effect of increasing accuracy.

This is a control method that detects the steam generated from the heated object 2 and stops the heating of the heated object.If the exhaust method of this embodiment is applied, the exhaust gas can be This is because the amount of steam inside can be increased compared to the conventional example.

In the above embodiment, a case has been described in which an exhaust port is provided in the partition plate 13 that divides the heating chamber into upper and lower sections, but the present invention can also be applied to a partition plate that divides the heating chamber into left and right sections. be.

In addition, in the above embodiment, the temperature of the air discharged from the heating chamber (
We have described the method of detecting the temperature (temperature or humidity) of the air in the duct connecting the partition plate exhaust port and the heating chamber exhaust port.
The present invention is also applicable to detecting humidity (or humidity).

In this case, the exhaust sensor is used while being shielded from high frequency power by a high frequency shield having ventilation holes.

In the above example, □ is a non-ventilated door, but if an opening is provided in the door and outside air is sucked into the heating chamber through the door (i.e., the door is used as the heating chamber intake port). The present invention is also applicable.

As described above, according to the present invention, an exhaust port is provided in the partition plate in the heating chamber, and the partition plate exhaust port and the heating chamber exhaust port provided on the heating chamber wall are connected by a duct. The temperature rise value of the air flowing out from the heating chamber exhaust port (i.e., exhaust gas) increases, and therefore, the accuracy of detecting the temperature of the object to be heated based on the temperature of the exhaust gas improves, which not only makes it possible to optimize heating, but also The reliability of control performance is improved, and the control device can be simplified and lowered in price, among other great effects.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a conventional high-frequency heating device, Figure 2 is a diagram showing the temperature rise characteristics of intake air and exhaust air in Figure 1, and Figure 3 is a diagram showing the temperature rise characteristics of intake air and exhaust air in Figure 1.
Figure 4 shows an embodiment of the high frequency heating device of the present invention.
FIG. 5 is a diagram showing a comparison of exhaust temperature rise characteristics with respect to intake air in a conventional example and an example when frozen shumai is used as the object to be heated, and FIG. 5 is a diagram showing another example. FIG. 6 is a diagram showing an example of the structural diagram of the partition plate in FIG. 5. In the figure, 1... Heating chamber, 2... Heated object, 5... Intake sensor, 6...
Exhaust sensor, 10... Heating chamber intake port, 11.
... Heating chamber exhaust port, 13 ... Partition plate, 1
6...Partition plate exhaust port, 17...Duc
to.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a high-frequency heating device that heats the object by supplying high-frequency power into a heating chamber housing an object to be heated, air inside the heating chamber or air discharged from the heating chamber a mechanism that detects the temperature (or humidity) of the air, and a mechanism that stops the supply of the high frequency power or reduces the high frequency power when the temperature (or humidity) of the air reaches a preset value. A continuation mechanism and a partition plate that partitions the inside of the heating chamber are provided, an exhaust port is provided on the partition plate, and the partition plate exhaust port and the heating chamber exhaust port provided on the wall surface of the heating chamber are connected using a duct. A high-frequency heating device featuring: 2. In the high-frequency heating device according to paragraph 1 of the claims for utility model registration, the high-frequency heating device is characterized by having a small number of ducts (partially using a partition plate) connecting the partition plate exhaust port and the heating chamber exhaust port. heating device.