JPH0319448B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high frequency heating device having a temperature probe for detecting the temperature of an object to be heated by the high frequency heating device. This is an improvement on the malfunction that occurs.

Structure of a conventional example and its problems FIGS. 1 and 2 are schematic cross-sectional views of the structure of a conventional high-frequency heating device with a temperature probe provided with a jack on an oven top plate. Motor 2 at the bottom of oven 1
The motor 2 is driven by a rotating shaft 3, which rotatably disposes a turntable 5 held by a roller 4, on which food 6 is placed and heated by microwaves. 8 food 6
Temperature information is transmitted through a cable and a plug 10 inserted into the oven, and 11 prevents radio wave leakage from occurring at or near the center axis of the oven top plate 1A, which corresponds to the center axis of the turntable 5. The plug 10 of the temperature probe 7 is held by the spring metal plate 13 by the jack of the temperature probe rotation support device fixed through the yoke cover 12, and the electric output terminal 14A is pressed by the sleeve 15 and the electric output terminal 14B is pressed. Electric signals are taken out from each part, and each part is separated by an insulator 16. Surrounded by a pipe 17 made of resin, the sliding
The jack 11 rotates while ensuring smoothness. Food 6
The steam generated when heated is the oven top plate 1A.
The air is discharged into the room from the louver 18A of the body 18 through the exhaust hole 1B. FIG. 2 shows the use of the temperature probe 7 as a temperature probe attachment part and the object to be heated 6 as a normal microwave oven. At this time, the jack 11 of the temperature probe rotation support device of the temperature probe 7 is directly exposed to the steam, oil, and food juice of the heated object generated in the heating chamber. Since the interior is sealed, it is always filled with steam, and the spring metal plate 13 and sleeve 1
5. Rust and dirt adhere to the insulator 16, resulting in an increase in contact resistance and a decrease in insulation resistance. When the function of the temperature probe 7 is required, an accurate electrical signal cannot be transmitted to the temperature control circuit disposed outside the oven due to an increase in contact resistance and a decrease in insulation resistance when the temperature probe is inserted and connected. In severe cases, problems such as loss of continuity may occur. In addition, the inside of the jack 11 of the rotation support mechanism is filled with steam and at the same time condensation water is generated, and water droplets adhere to the spring metal plate 13, the sleeve 15, and the insulator 16, and the space between the spring metal plate 13 and the sleeve 15 increases. are connected by water droplets,
A resistance value occurs at the electrical output terminals 14A and 14B,
The insertion connection of the temperature probe and the control circuitry outside the oven will detect this and cause a malfunction that will stop normal microwave operation. Furthermore, normal microwave oven operation cannot be performed until the water droplets are no longer connected.
In addition, since the inside of the jack 11 of the rotary support device is in a sealed state, water droplets evaporate slowly, resulting in a major problem in that it takes a long time to return to normal operation.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks by a simple method, and provides a highly reliable high-frequency heating device that does not malfunction.

Structure of the Invention In order to achieve the above object, a detection part of a temperature probe is pushed into an object to be heated on a table provided in an oven, and a magnetron is controlled based on the detected temperature, and the temperature probe is attached and detached. It has an electrical output terminal that is freely supported, and the electrical output terminal includes a plug insertion hole for inserting a probe into the terminal, a ventilation hole that communicates the plug insertion hole with the outside of the oven, and a jack that forms a ventilation passage. A water droplet prevention material such as a heat conductive plate or an absorbent material having good thermal conductivity is provided on the ventilation hole.

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

FIG. 3 is a schematic cross-sectional view of a high-frequency heating device with a temperature probe equipped with a rotation support mechanism and a heat transfer plate according to the present invention. A motor 2 is provided at the bottom of the oven 1, and the motor 2 is driven by a rotary shaft 3. A turntable 5 supported by rollers 4 is rotatably disposed, and an object to be heated 6 is placed on the turntable 5 and heated by microwaves. Reference numeral 11 denotes a jack of a rotation support device for the temperature probe 7, which is fixed via a nut 19 to the center axis of the oven top plate 1A corresponding to the center axis of the turntable 5 or in the vicinity thereof. The jack of the rotation support device has an insertion hole 20 for the temperature probe 7.
Sleeve 21 provided with electrical output parts 22A, 2
It consists of plate spring contact pieces 24A, 24B having spherical contacts 23A, 23B, and an insulating body 25 that fixes them, and is integrated with the sleeve 21. The body 25 is provided with a ventilation hole 26 that corresponds to the insertion hole 20 of the temperature probe 7 and communicates with the outside of the oven, forming a ventilation path 27.
has been established. 1B is a steam exhaust hole on the oven top plate 1A, 18 is a body, 18A is a steam exhaust louver, and a partition plate 2 that partitions the flow of steam.
9, a sokoita 30, and a leg rubber 31 are shown, respectively.
If you use it as a microwave oven without using the temperature probe 7, you will be directly exposed to the steam, oil, and food juice of the object to be heated 6 generated in the heating chamber, but the steam will pass through the insertion hole 20 of the plug 10 of the temperature probe. The contacts 23A and 23B, which are equipped with electrical output parts 22A and 22B, have less condensation because they pass through the ventilation passage 27 and exit outside the oven through the ventilation hole 26.
The plate spring contact pieces 24A and 24B having the same structure are not electrically connected by water droplets, and malfunctions do not occur. Furthermore, if the steam passing through the ventilation passage 27 and exiting from the ventilation hole 26 hits the body 18 directly, dew condensation occurs due to the temperature difference with the body 18 and becomes large water droplets. It will fall into the oven. Also, when falling into the oven, the contacts 23A, 2
3B, there is a problem of water droplets accumulating inside the jack 11, but this also has a heat conductive plate 28 with good thermal conductivity above the ventilation hole 26, so even if the steam gets hot, it can be used as a heat transfer plate 28 with good heat conductivity such as a copper plate. The transmission plate quickly reaches the steam temperature and no condensation occurs, so the above-mentioned problem does not occur. In addition, since the contacts 23A and 23B are spherical,
It should not get dirty easily. Further, when the temperature probe 7 is inserted, dirt is scraped off by the plug 10, so that a stable electrical output can be obtained at all times.

FIG. 4 shows another embodiment, in which an absorbent material 32 such as cushion rubber for absorbing steam is provided on the back surface of the body 18 above the ventilation hole 26 of the jack 11, which has the same effect as the above. , Jack 11
This absorbs steam from the ventilation holes 26 and prevents water droplets from falling.

Effects of the Invention As described above, according to the high-frequency heating device with a temperature probe of the present invention, the temperature probe is detached from the temperature probe attachment part, and the temperature probe rotation support mechanism prevents malfunctions that occur when the heated object is used as a normal microwave oven. By forming a plug insertion hole, a ventilation hole and a ventilation path that communicate with the outside of the oven, and installing a water droplet prevention material such as a heat transfer plate or an absorbent material over the ventilation hole, steam, oil, etc. generated from the heated object can be prevented. This is a highly reliable high-frequency heating device that eliminates malfunctions caused by food stains.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view when a conventional temperature probe is used, FIG. 2 is a half-sectional view when a conventional microwave oven is used, and FIG. 3 is a half-sectional view when an embodiment of the present invention is used in a microwave oven. FIG. 4 is a half sectional view of another embodiment of the present invention when the microwave oven is used. 11...Jack, 20...Plug insertion hole, 2
6... Ventilation hole, 27... Ventilation path, 28... Heat transfer plate, 32... Absorption plate.

Claims (1)

[Claims] 1 The detection part of the temperature probe is pushed into the object to be heated on the table provided in the oven, and the magnetron is controlled based on the detected temperature, and the temperature probe is provided with an electrical output terminal that detachably supports the temperature probe. , this electrical output terminal includes a plug insertion hole for inserting the probe into the terminal, a ventilation hole for communicating this plug insertion hole with the outside of the oven, and a jack for forming a ventilation path, and a jack having good thermal conductivity is placed on the ventilation hole. A high-frequency heating device equipped with a water droplet prevention material such as a heat transfer plate or absorbent material.