JPS61260590A - 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: Industrial Application Field The present invention measures the weight of the object to be heated and controls the heating time, heating temperature, heating output, heating method, etc. according to the weight, thereby achieving automatic heating. The present invention relates to a weight detection device for a heating device that makes it possible to.

BACKGROUND TECHNOLOGY In conventional manual type high-frequency heating devices, for example,
When reheating cold rice, miso soup, etc., cooking vegetables, or thawing frozen foods, the user should measure the weight of the food,
It was necessary to set the heating time and heating output according to the weight using a time switch or an output selection button. Therefore, before you start cooking, you need to measure the weight of the food, the heating time, etc.
It required cumbersome operations such as setting the heating output, and improvements in usability were desired.

In addition, high-frequency heating devices with automatic control functions are equipped with sensors, which have been developed in recent years, to detect food surface temperature, water vapor, alcohol, etc. generated from food.
Automatically controls food heating time and heating output. However, among these automatic heating devices, those equipped with infrared sensors that detect the surface temperature of food mainly only detect the surface temperature of one part of the food, but cannot detect the temperature or heating status of all four parts. However, the finished product was uneven depending on the shape and weight. On the other hand, products equipped with gas sensors that detect water vapor, alcohol, etc. generated from food can detect water vapor and produce good results when reheating or cooking raw vegetables and vegetables, but they do not produce water vapor when defrosting food. Since it cannot detect food that is not being defrosted, it requires the same effort as the manual type: measuring the weight of the food to be thawed, selecting the timer volume and output selection key, and then starting cooking.

Therefore, in order to eliminate these drawbacks and further ensure good heating without failure, we can automatically measure the weight of food.
There was a desire for something that could be cooked with the optimal heating time, heating output, and heating method.

In order to satisfy these demands, various methods for automatically determining the weight of food have been devised, and some of these methods have been commercialized.

However, when measuring the weight of food, the accuracy of the measuring device is required. Accuracy includes the difference from the true value, variations due to repeated measurements, variations caused by the position of the food,
There are variations caused by the location where the main unit is placed, and errors caused by the environment such as temperature and humidity.

Naturally, when cooking is performed using values that include such variations and errors, the finished state of the cooked food will not be good.

Therefore, there was a need for a method and structure that would solve these problems and increase the accuracy of food weights and reduce errors.

For example, in the conventional high-frequency heating apparatus shown in FIGS. 2 to 6, numeral 1 in FIG. 2 is a heating chamber in which food is stored and heated;
A door 2 is provided on the front surface of the device so that it can be opened and closed. 3 is a magnetron that supplies high frequency to heating chamber 1; magnetron 3;
The high frequency waves oscillated from the heating chamber 1 pass through the waveguide 4 and are irradiated onto the object to be heated 6 placed on the rotary plate 5 in the heating chamber 1, thereby heating it.

The rotating plate 5 is placed on a rotating mounting table 7. Rotating mounting table 7
is fitted onto a shaft 8 that passes through an opening provided at the bottom of the heating chamber 1, and the drive of the motor 9 is transmitted to the shaft 8 by two gears 10 and 11, thereby rotating the rotary mounting table 7. .

FIG. 3 is a detailed view of the Roberval mechanism, which is a weight detection device, and FIG. 4 is a diagram showing the mechanical parts thereof. Next, details of the weight detection device will be explained with reference to FIGS. 3 and 4.

The structure of the donkey hull mechanism is that two aluminum blocks AI2 and B13 are connected by a plurality of leaf springs 14. And aluminum block B13 and leaf spring 1
The overlapping surfaces of the aluminum block A 12 and the plate spring 14 are fixed by a magnet mounting plate 16 and a motor mounting plate 17.

A magnet 18 is fixed to the tip of the magnet mounting plate 16, and a coil 19 is fixed to the aluminum block B13, and the weight is detected by the magnet 18 and the coil 19.

Further, a drive motor 21 for rotating a rotating shaft 20 is fixed to the motor mounting plate 17 with screws 22.
A gear A24 is fitted onto the shaft 23 of the motor 21. A gear B26 is fitted onto the rotating shaft 20, and is housed in a notch in the center of the aluminum block A12. Further, the rotating shaft 20 is prevented from wobbling back and forth and from side to side by the hole provided in the aluminum block AI2 and the bearing 32.

The drive motor 21 rotates between gear A24 and gear B.
25 to the rotating shaft 20. Furthermore, a rotating mounting table 27 on which a rotating plate 26 is placed is fitted onto the rotating shaft 2o, and the object to be heated 28 is rotated during high-frequency heating so that it can be heated evenly.

FIG. 6 is a sectional view showing the mounting structure of the Roberval mechanism. In the figure, 13 is an aluminum block B on the fixed end side of the Roberval mechanism, and 30 is its mounting plate.

The aluminum block B13 is attached to a strong metal mounting plate 3o fixed to the bottom surface of the heating chamber 29 with screws 31 to fix one end of the Roberval mechanism 1, and the other end to which the rotating shaft 20 is attached is configured to vibrate.

Further, the aluminum block B13 has a convex shape, and the mounting plate 30 has a shape, and is fixed at both ends of the convex shape.

In the high-frequency heating device configured as described above, when the object to be heated 28 is placed on the rotating plate 26, its weight is applied to the free end of the Roberval mechanism via the rotating mounting table 27 and the rotating shaft 20.
It is displaced downward according to its weight. This movement is a characteristic of the Roberval mechanism and is always a vertical displacement. When the Roberval mechanism is vibrated by the impact when the object to be heated 28 is placed on it or by the impact subsequently applied to the Roberval mechanism from the outside, it vibrates at a natural frequency corresponding to its weight.

This vibration generates an induced voltage in the magnet 18 fixed at the free end and the coil 19 fixed at the fixed end, and by detecting this, the entire weight can be measured.

Therefore, the rotating plate 26, the rotating mounting table 2, the motor 21
, gears 24, 25, and aluminum block A in advance, it is possible to measure only the weight of the object to be heated 28 from the total weight.

If the oscillation of the magnetron is controlled according to the weight of the object to be heated 28, cooking can be performed with optimum heating output and heating time.

Problems to be Solved by the Invention However, in such a structure in which the weight is measured by vibrating the Roberval mechanism, as shown in the plan view of the weight detecting section in FIG.
is covered with a protective tube 34. This protective tube 34 is for protecting the electric wire 32 from metal edges and high temperature parts. Generally, in such a structure, the electric wire 33 is often made of a vinyl chloride material, and the protective tube 34 is often made of a silicon-impregnated glass braided tube for that purpose.

Since the Roberval mechanism has a structure in which the block B13 is fixed and the drive motor 21 side vibrates, the electric wire 33 is drawn out to the block B13 side so as not to interfere with the vibration.

The holder 3 is fixed to the protruding crimp portion 17a of the motor mounting plate 17 and the end of the block E13 with screws 36.
The electric wire 33 is held at two locations 6.

However, if the electric wire 33 is not held correctly, for example if it is strongly pulled between the crimp portion 17a and the holder 36, the vibration of the Roberval mechanism will be hindered and the vibration will dampen quickly.

Figure 7(a) shows the induced voltage generated in the coil 19 at this time, but as the vibration decays quickly, the number of effective pulses decreases, and the number of pulses that are originally required to measure the weight of the heated object decreases. In this case, cooking will not be possible or optimal heating conditions will not be obtained.

Furthermore, even if careful attention is paid to the assembly of the Roberval mechanism and the installation work into the main body of the device, there are limits, and there is a problem in that it is extremely difficult to always obtain an effective number of pulses with sufficient margin for the required number of pulses. Ta.

The present invention solves these conventional problems, and uses a simple configuration to always accurately measure the weight of the object to be heated, automatically setting the optimum heating output and heating time, and achieving a good result. To provide a heating device that is easy to use, convenient, and highly reliable.

Means for Solving the Problems In order to achieve the above object, the heating device of the present invention measures the weight of the object to be heated and automatically heats it with the optimum heating output and heating time. This heating device is configured to measure the weight of the heated object by the number of pulses per hour, and by eliminating the influence of the protective tube of the drive motor's electric wire, which was an obstacle to the vibration of the Roberval mechanism, this becomes the basic data for weight calculation. This configuration increases the number of effective pulses and ensures a stable state with sufficient margin for the required number of pulses.

Effect: The heating device of the present invention has a sufficient number of effective pulses obtained compared to the number of pulses required to calculate the weight of the object to be heated, so the accuracy of the measured value is improved and there is no shortage of effective pulses. This also eliminates phenomena that cannot be measured. In addition, the effect of the installation location of the heating device, ie, if it was installed in an unstable place such as on top of a kitchen sink, the number of effective pulses decreased and measurement became impossible, but this problem can also be solved.

As described above, since all the problems caused by the lack of effective pulses can be solved, stable automatic cooking can be ensured, and the reliability of the heating device can be further improved.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. In the conventional examples and the detailed description of the invention, the same numbers indicate the same names.

As shown in the plan view of the Roberval mechanism for measuring the weight of the object to be heated in FIG. 1, the rotating shaft 2o that fits into the rotating mounting table is rotated by the rotation of the drive motor 21 being transmitted through the gear A24 and the gear B26. do. This drive motor 21 is fixed with screws 22 to a motor mounting plate 17 that is integrated with a roberval mechanism whose basic structure is four leaf springs 14 and a pair of aluminum blocks A12 and B13.

The aluminum block B13 is the fixed side of the Roberval mechanism, and a magnet 18 is fixed to the free end side, and a coil 19 for detecting the amount of displacement of the magnet 18 is fixed to the aluminum block B13. On the other hand, the electric wire 33 of the drive motor 21 described above
is the motor mounting plate 17 with the protective tube 34 covered.
It is held by a holder 36 fixed to the crimp portion 17a of the aluminum block B13 with screws 36. Protective tube 3
4 is cut between these two holding parts and is discontinuous.

In the embodiment, the electric wire 33 is a PVC electric wire, and the protective tube 34 is
This uses a silicone-impregnated glass braided tube, which is cut at two points to create discontinuities. The total gap between the cutting parts is kept within a few sets.

Effects of the Invention As described above, the heating device of the present invention provides the following effects.

(1) By significantly reducing the influence of the drive motor's electric wires and protective tube, which were factors that hindered the vibration of the Roberval mechanism, the effective number of pulses has been reduced compared to the number of pulses required for weight measurement. (in Figure 7). This allows a sufficient margin for the number of pulses, eliminating the conventional phenomenon of inability to measure due to insufficient number of pulses, and greatly improving reliability.

(2) Conventionally, when assembling the Roberval mechanism or assembling it into the device body, the tension of the electric wire changed and there was a problem due to an insufficient number of pulses, but the increase in the number of effective pulses increases the margin, making it easier to perform such work. The impact of

p) The effective number of pulses tends to decrease when the heating device is placed in an unstable or soft location, but even in such cases, the effect is less because there is more margin for the required number of pulses. It becomes difficult to receive.

(4) As described above, all the problems caused by the conventional method of not having a sufficient margin in the number of effective pulses can be solved, stable weight measurement results can always be obtained, and measurement accuracy can be further improved. The performance of automatic heating, which measures the weight of objects and automatically sets the heating output and heating time, has been improved.
The finished state can also be made even better.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the weight detection section of a heating device according to an embodiment of the present invention, Fig. 2 is a partial sectional view showing the structure of a conventional heating device, and Fig. 3 is a weight detection section of the heating device. Fig. 4 is an exploded view of the heating device; Fig. 6 is a partial sectional view showing the mounting structure of the weight detection portion of the heating device; Fig. 6 is the weight detection portion of the heating device. FIG. 7 is a characteristic diagram showing signals generated in the weight detector. 12... Aluminum block A, 13...
Aluminum block B, 14...Plate spring, 18...
...Magnet, 19...Detection coil, 20...
... Rotating shaft, 21 ... Drive motor, 24.
...Gear A126...Gear B, 26...
... Rotating plate, 27... Rotating mounting table, 28.
...Object to be heated. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 4

Claims (1)

[Claims] A heating chamber for heating and cooking an object to be heated by a heating means, a rotating mounting table for placing the object to be heated in the heating chamber, a motor for driving the rotating mounting table, and the rotating mounting table and the motor are integrated. a detector for detecting vibrations of the elastic body, and a control device for controlling a heating means; The weight of the object to be heated is detected by a detector, and the operation of the heating device is controlled by the output of the detector, and the electric wire connected to the motor is covered with a protective tube and held on the fixed side of the elastic body. A heating device configured such that the protective tube is discontinuous between the holding portion and the motor.