JPS6112357B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave oven using a turntable and having a temperature sensor for detecting the temperature of a heated object. Generally, when a temperature sensor is installed in a microwave oven that uses a turntable, the temperature sensor probe of the heated object sends an electrical signal when the temperature reaches a preset temperature outside the oven and shuts off the power supply to the high-frequency power generation source. I try to do that. However, since a turntable is used, the object to be heated rotates at the same time as the turntable. When a temperature sensor is inserted into a heated object for temperature detection and temperature control, a problem will occur unless the temperature sensor also rotates in synchronization with the turntable. If the so-called synchronous rotation does not occur, problems such as twisting of the coaxial cable, food falling over or movement, and the temperature sensor coming off from the heated object will occur. Further, a temperature sensor mounting portion is disposed at least near the oven top plate corresponding to the center of the turntable, and the temperature sensor is configured to be rotatably and detachably connected to the temperature sensor mounting portion. In this configuration, when the temperature sensor is removed from the temperature sensor mounting part and used as a normal microwave oven, the connection part between the temperature sensor and the temperature sensor mounting part is directly connected to the steam, oil, and food generated in the heating chamber. When exposed to liquid, rust and dirt adhere to the electrical contact points of the temperature sensor mounting part, resulting in an increase in contact resistance and a decrease in insulation resistance. When the temperature sensor function is required, if the temperature sensor is inserted into the temperature sensor mounting part, the contact resistance will increase and the insulation resistance will decrease, making it impossible to transmit accurate electrical signals to the temperature control circuit installed outside the oven. . In severe cases, problems such as loss of continuity may occur. The present invention solves the former and latter problems. In other words, the following two methods can be used to solve the former problem.
I can think of a method. There is a way to force the temperature sensor to rotate in sync with the turntable. The temperature sensor inserted into the heated object placed on the turntable transmits the rotational force driving the turntable from the heated object to the temperature sensing element made of a metal tube of the temperature sensor to the coaxial cable of the temperature sensor. There is a method of driving the temperature sensor to rotate naturally at the connection part of the temperature sensor mounting part. As a method for solving the latter problem, there is a method of providing a steel ball as a shielding means in order to be able to shield the communication port at the connection part between the temperature sensor and the temperature sensor mounting part. The present invention will be described in detail below with reference to an illustrated embodiment. FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the main part configuration showing an embodiment of the present invention, and FIG.
5 to 5 are sectional views showing main parts of other embodiments of the present invention, FIG. 6 is a front view and side sectional view of the electrical connection part of the present invention using a slider, and FIG. 7 is a sectional view of the electrical connection section of the present invention. 8A, B, and C are schematic configuration diagrams of an embodiment in which the rotations of the turntable and temperature sensor are synchronized. Identical parts are designated by the same reference numerals in all figures. 1 to 8 will be explained in order. In FIG. 1, reference numeral 1 denotes an oven, and a turntable 2 on which a heated object A is placed is rotatably supported at the bottom of the oven 1 by a drive source such as a motor M. Although not shown, the oven 1 is housed within the main body of a microwave oven, and a front opening thereof is provided with a door that can be opened and closed. A central axis 2A that is the center of the turntable 2
A temperature sensor attachment part 4 for connecting a temperature sensor 3 is disposed at or near the center axis position of the oven top plate 1A corresponding to the oven top plate 1A. The temperature sensor 3 has a temperature sensing element part 6 capable of sensing the internal temperature of the object to be heated A, and a coaxial cable 5 connected to the temperature sensing element part 6 so as to be integrally connected or to transmit a temperature signal. . The temperature sensor 3 is attached to the temperature sensor mounting part.
It is rotatably and detachably connected to 4 . The temperature sensor mounting portion 4 is connected to the temperature control circuit portion 8 via the electric signal output end 7' of the electric signal transmission portion 7. The temperature control circuit section 8 sends a signal to the electric circuit section 9 of the microwave oven. Next, a description will be given with reference to FIG. In this embodiment, the temperature sensor 3 is driven by a temperature sensor synchronous motor 11 so as to rotate in synchronization with the motor M which is the drive source of the turntable 2. A slip ring 7A is connected to the lower part of the electrical signal transmitting part 7, and a slip ring 7B is connected to the upper part, and the connecting part 10 and the slip ring 7B are connected. The slip ring 7B is connected to a jack 12 made of a conductive material, which is the center of electrical connection in the temperature sensor mounting portion 4 , by means of a fixing screw 15 that fixes the jack 12. Note that 16 is a motor mounting plate on which the synchronous motor 11 is mounted. The temperature sensor mounting portion 4 has a chiyoke structure. That is, a sleeve 13 made of Teflon material and covering the jack 12 from the outside is rotatably provided. A metal cylindrical inner side 4A and a metal cylindrical outer side 4B are provided so as to be inscribed on the outside of the sleeve 13, and this metal cylindrical inner side 4
The space length between A and the outer side 4B of the metal cylinder is configured to be λ/4 as shown in the figure. and the jack 1 of the temperature sensor mounting part 4 .
When the plug 14 provided at the tip of the coaxial cable 5 of the temperature sensor 3 is connected to the turntable 2
The temperature of the heated object A above is sensed, and an electric signal is transmitted to the temperature control circuit section 8 via the electric signal transmission section 7. Reference numeral 17 denotes a plug handle that is used when attaching the temperature sensor 3 to the temperature sensor attachment part 4 . If the plug 14 is removed and the microwave oven is used normally, steam and food juice will enter the connection part of the temperature sensor attachment part 4 . An embodiment shown in FIG. 3 has been devised as a method for preventing this. Note that since the configuration is substantially the same as that in FIG. 2, a detailed description of the configuration will be omitted. In FIG. 3, at least the plug 14 and the plug handle 17 are connected to the connection part between the jack 12 and the plug 14.
The protective cover 18 is attached to the oven top plate 1A with the through hole 18A located at the center of the bottom so that a part of the
It is installed on. A steel ball 19 is installed in the protective cover 18 so as to be in position A as a shielding means for blocking the through hole 18A when the plug 14 is not inserted into the jack 12. When the steel ball 19 inside the protective cover 18 requires the temperature sensor function, the temperature sensor 3 is connected to the temperature sensor mounting part 4 , and the steel ball 19 is pushed up by the plug 14 and is at position B. It has been moved to . The steel ball 19 may be coated with a resin 19A as shown in FIG. 3B. Further, as shown in FIG. 3c, a damper 20 that can be opened and closed by its own weight or a damper 20 using a stiff spring is provided as a means for shielding the through hole 18A formed in the protective cover 18. Therefore, when the temperature sensor function is required, when the temperature sensor 3 is connected to the temperature sensor mounting portion 4 , the damper 20 is pushed up to the state C as shown in the figure, and the connection between the two becomes possible. Next, from the temperature sensor mounting part 3 ,
When the damper 20 is removed, the damper 20 is positioned at position D as shown in the figure due to its own weight or the action of a stiff spring, and the through hole 18A is closed. The steel ball 19 is preferably made of a heavy steel ball or the like rather than a light material. As explained in FIG. 3B, the steel ball 19
By coating the surface of the ball with Teflon, it is possible to prevent the ball from becoming immobile due to rust between the steel ball 19 and the protective cover 18. In addition, the steam of the heated material generated in the oven 1,
Since food juice does not enter the connection portion of the temperature sensor, there is no increase in contact resistance or decrease in insulation resistance, and accurate electrical signals can be transmitted to the temperature control circuit 8. Figure 4 shows a temperature sensor 3 that is driven by the rotation of the turntable 2, and a temperature sensor mounting section that is connected to the temperature sensor 3 .
This implements a natural rotation transmission system that rotates by 4 . A temperature sensor mounting part 4 is arranged on the oven top plate 1A corresponding to the center of the turntable 2. The temperature sensor mounting portion 4 has a tree-yoke structure, and is provided with a sleeve 13 made of Teflon material so as to cover the jack 12. A metal cylindrical inner side 4A and a metal cylindrical outer side 4B are provided inscribed on the outside of the sleeve 13, respectively. This metal cylinder inside 4A and metal cylinder outside 4B
As shown in the figure, λ/
It is set at 4. A jack outer cylinder 12' is provided inscribed inside the sleeve 13 and is always in contact with one terminal 12A of the jack 12. Another jack 12 is connected to a conductive contact and mounting screw 22 which fixes the jack outer cylinder 12' by mounting plates 21A and 21B made of an insulator. An elastic and conductive plate brush 23 that comes into contact with the tip of the contact/attachment screw 22 is attached to an insulating fixing plate 24 . A carbon brush 25 made of a low friction coefficient material and electrically conductive is provided so as to be in constant contact with the tip of the jack outer cylinder 12'. This carbon brush 25 is attached to the fixing plate 2 by a spring retaining screw 27 via a brush retaining spring 26.
It is attached to 4. The brush holding spring 26 is made of a conductive material such as phosphor bronze, and the spring holding screw 2 is made of a conductive material such as phosphor bronze.
7 uses conductive material such as brass. Furthermore, nylon thrust washers 28A, 28B are attached to the upper part of the metal cylinder outer side 4B below the carbon brush 25 of the jack outer cylinder 12'.
Stop spring 29 held from both sides by
is provided, and is rotatably fixed from the outside by this stop ring 29. And temperature sensor 3 and temperature sensor mounting part 4
A protective cover 18 having a through hole 18A at the connection part of
has been established. A steel ball 19 is housed inside the protective cover 18 as a shielding means that allows the through hole 18A to be opened and closed. This is as explained in the embodiment shown in FIG. 3, and the same applies to other implementation methods.
The jack 12 is fixedly supported by a fixing plate 30 made of an insulating material such as phenolic material and provided at an appropriate position within the jack outer cylinder 12'.
FIG. 5 shows a device in which the temperature sensor 3 is driven by the rotation of the turntable 2 , as in FIG . This is another example of implementing the method. A temperature sensor mounting part 4 is arranged on the oven top plate 1A corresponding to the center of the turntable 2. The temperature sensor mounting portion 4 has a tree-yoke structure, and is provided with a sleeve 13 made of Teflon material so as to cover the jack 12. A metal cylindrical inner side 4A and a metal cylindrical outer side 4B are provided inscribed on the outside of the sleeve 13, respectively. A jack outer cylinder 12' of the jack 12 is provided so as to be inscribed inside the sleeve 13. The jack outer cylinder 12' has a fixing ring 24 made of an insulating material such as phenolic material at its tip.
fixedly supported by the jack outer cylinder 1
Contact plate 1 of jack 12 is placed at an appropriate position inside 2'.
2A and 12B are fixedly supported by a fixing plate 30 made of a phenolic insulator that is fitted and fixed. The jack outer cylinder 12' can be fitted and fixed from the outside at its tip, and a fixing ring 24 made of a phenolic insulator into which the tips of the contact plates 12A', 12B' of the jack 12 are fitted.
It is fixedly supported by. The contact plates 12A, 12B of the jack 12 and the contact plates 12A', 12B' are connected by fixed terminals 12T. Then, the tips of the contact plates 12A' and 12B' are attached to a slip ring 24 provided on the fixing ring 24.
A is connected to the lower slip ring 24B. The upper slip ring 24A and the lower slip ring 24B are made of a conductive material such as brass, and are provided so that their outer peripheries are in contact with the brush plates 32, 32 to establish an electrical connection. The brush plates 32, 32 are attached to a brush fixing plate 33 provided on the oven top plate 1A. A through hole 18A, which allows at least part of the plug 14 and plug handle 17 to be inserted into the connection between the temperature sensor 3 and the temperature sensor mounting part 4, that is, the connection between the jack 12 and the plug 14, is located at the center of the lower part. Place the protective cover 18 on the oven top plate 1.
It is attached to the bottom of A. A steel ball 19 (steel ball) is provided inside the protective cover 18 as a shielding means for blocking the through hole 18A when the plug 14 is not inserted into the jack 12.
is installed in the A position as in the above embodiment. Incidentally, the steel ball 19 is capable of changing its position as required, as in the above embodiment. Although not shown, a plug fixing ring is provided on the top surface of the oven top plate 1A so that the shielding means for the connection between the jack 12 and the plug 14 is located above the oven top plate 1A, and the steel ball 19 can move on the plug fixing ring. It is also possible to provide it so that. Next, an example of the electrical connection part will be explained with reference to FIGS. 6 and 7. First, in FIG. 6, a movable sliding piece 40 to which an electric signal transmission lead wire 40A is installed and connected is provided at the upper end on the temperature sensor side, and an electric signal is transmitted to the temperature control circuit section 8 through this movable sliding piece 40. For this purpose, electrical connection terminals 41 are fixedly provided. The electrical connection method in this embodiment is a method using a slider mechanism. Next, in FIG. 7, an annular movable body 40' made of a phosphor bronze or brass plate is provided at its upper end on the temperature sensor side to which an electrical signal transmission lead wire 40A is connected. In order to transmit electrical signals to the temperature control circuit section 8 from this annular movable body 40', an electrical connection terminal 41' having a contact 41A made of carbon or phosphor bronze attached to the tip is covered and fixed with a rubber cushion 42 or the like. I support it. The electrical connection method in this embodiment is by a brush mechanism. Since the electrical connection methods shown in FIGS. 6 and 7 require two circuits (earth side and hot side), it is necessary to install two sets in duplicate. Next, an explanation will be given with reference to an embodiment in which the rotations of the turntable and temperature sensor are synchronized as shown in FIG. In FIG. 8A, the turntable 2 is connected to a turntable motor M as a drive source, a temperature sensor 3 is connected to a temperature sensor mounting part 4 , and a synchronous motor 11 that rotates in synchronization with the motor M via an electrical signal transmission part 7 and a connection part 10. It is configured to be driven in this manner. FIG. 8B shows a gear 2A fixed to the output shaft of a motor M, which is the drive source of the turntable 2.
A timing belt 45 is provided to transmit the signal from A to the transmission gear 2B. The transmission gear 2B and the transmission gear 2C provided above
is fixed by a transmission shaft 2D. The temperature sensor 3 is provided with a gear 2E coaxially via a temperature sensor mounting part 4 and an electric signal transmission part 7. This gear 2E and the transmission gear 2C are connected and transmitted by another timing belt 46. That is, the temperature sensor 3 is configured to be driven by the motor M of the turntable 2 via a gear transmission mechanism. In FIG. 8C, the output shaft of the motor M for driving the turntable 2 and the upper end on the temperature sensor side are connected to a wire mechanism consisting of a flexible cable 47 so that the drive is transmitted. As described above, even if the microwave oven of the present invention is used with the temperature sensor inserted into food on the turntable, the rotation of the temperature sensor follows or synchronizes with the rotation of the turntable, so it is smooth. It rotates accurately and transmits reliable electrical signals. Furthermore, the temperature sensor mounting part, which is the connection part of the temperature sensor, has a chi-yoke structure and a shielding means when the temperature sensor function is not required, thereby eliminating the influence of microwaves and transmitting electrical signals to fully demonstrate the temperature sensor function. To provide a highly valuable product in which the temperature sensor function is completely shut off by the shielding means when not in use, and microwaves are prevented from entering the temperature control circuit section.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the main part configuration showing an embodiment of the present invention, and FIG.
5 to 5 are sectional views showing main parts of other embodiments of the present invention, FIG. 6 is a front view and side view of an electrical connection section of the present invention using a slider, and FIG. Side and front views of electrical connections using brushes,
FIGS. 8A, B, and C are schematic diagrams of an embodiment in which the rotations of the turntable and temperature sensor are synchronized. 1A...Oven top plate, 2...Turntable, 3
...Temperature sensor, 4...Temperature sensor mounting part, 11
...Synchronous motor, 18...Protective cover, 19...Steel ball, M...Motor for turntable.

Claims (1)

[Claims] 1. In a microwave oven using a turntable on which an object to be heated is placed and rotated, a temperature sensor mounting part is provided on the oven wall, and a temperature sensor for detecting the temperature of the object to be heated is attached to the object to be heated. A microwave oven that is inserted and rotatably connected to the above-mentioned mounting part, and rotates a temperature sensor in conjunction with the rotation of the turntable. 2. In a microwave oven that uses a turntable on which an object to be heated is placed and rotated, a temperature sensor mounting part equipped with a chiyoke mechanism is provided on the oven wall, and a temperature sensor that detects the temperature of the object to be heated is inserted into the object to be heated. The microwave oven has a temperature sensor rotatably connected to the above-mentioned mounting part, and rotates in conjunction with the rotation of the turntable. 3. In a microwave oven that uses a turntable on which the object to be heated is placed and rotated, a temperature sensor mounting part equipped with a means for shielding the connection port of the temperature sensor is provided on the oven wall, and the temperature sensor detects the temperature of the object to be heated. is inserted into the object to be heated and is rotatably and detachably connected to the mounting part, and the temperature sensor is rotated in conjunction with the rotation of the turntable,
A microwave oven in which the connecting port of the temperature sensor is closed by the shielding means when the temperature sensor is removed from the mounting part. 4. In a microwave oven using a turntable on which an object to be heated is placed and rotated, a temperature sensor mounting part equipped with a rotatable jack is provided on the oven wall, and a temperature sensor for detecting the temperature of the object to be heated is installed on the oven wall. and the plug of the temperature sensor is connected to the jack of the mounting part, and the temperature sensor is rotated in conjunction with the rotation of the turntable. 5. In a microwave oven using a turntable on which a heated object is placed and rotated, a temperature sensor that detects the temperature of the heated object and a temperature control circuit that controls the operation of the magnetron based on the detected temperature are electrically connected. A temperature sensor mounting part is provided on the oven wall, and the temperature sensor is inserted into the object to be heated and rotatably connected to the mounting part, and the temperature sensor is rotated in conjunction with the rotation of the turntable. A microwave oven. 6. In a microwave oven that uses a turntable on which an object to be heated is placed and rotated, a temperature sensor mounting part equipped with a jack rotated by a motor is provided on the oven wall, and a temperature sensor for detecting the temperature of the object to be heated is mounted on the oven wall. A microwave oven in which the temperature sensor is inserted into a heated object, the plug of the temperature sensor is connected to the jack of the mounting part, and the temperature sensor is rotated in conjunction with the rotation of a turntable. 7. In a microwave oven that uses a turntable on which the object to be heated is placed and rotated, a temperature sensor mounting part is provided on the oven top plate at a position corresponding to the center of the turntable or in the vicinity thereof, and the temperature sensor detects the temperature of the object to be heated. is inserted into the object to be heated and rotatably connected to the mounting portion, and the temperature sensor is rotated in conjunction with the rotation of the turntable.