JPS6136619A - Heat cooking utencil - Google Patents

Abstract

PURPOSE:To contrive to achieve the highly accurate measuring with an extremely simple circuit by a method wherein the weight of an object to be heated on a rotary securing table is detected as a vibrating frequency with a vibrating mechanism. CONSTITUTION:A fitting frame 17 is fixed on the back surface of a heating chamber bottom surface 15, a block 18 is fixed on the fitting frame 17, plural plate springs 31 are provided in parallel on the block 18 with an interval, the other ends of the springs are fixed to a block 19. A magnet fixing plate 28 is unified to the block 19, a magnet 29 is fixed on the plate 28, a coil 30 is arranged to be opposed to the magnet 29. The weight of the object to be heated is applied to the block 19 via a rotary securing table. As the block 19 is supported by the plate spring, when the object to be heated is put on the rotary securing table, the object to be heated and the rotary securing table are instantaneously vibrated by the vibrating frequency according to the weight of the object to be heated and the elasticity of the plate spring 31. The magnet 29 is vibrated according to said vibration, a signal is generated by the coil 30, the signal is inputted to a microcomputer, then the microcomputer controls the output of a magnetron, heating mode, heating time and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cooking device, such as a microwave oven, for cooking an object to be heated.

Conventional Structure and Its Problems FIG. 1 is a sectional view showing the structure of a conventional heating cooker. In FIG. 1, a door 2 is provided at the front of a heating chamber 1 so as to be openable and closable. A waveguide 3 is connected to the heating chamber 1, and a magnetron 4 is provided thereto. Radio waves oscillated from the magnetron 4 are irradiated into the heating chamber 1 via the waveguide 3.

The object to be heated 5 is placed on a rotating plate 6, and is rotated by a motor 7I during heating for uniform heating. This heats the object 5 to be heated, but according to such conventional heating cookers, the user sets the heating time according to the amount and weight of the object 5 using a time switch or the like. It's necessary and troublesome.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks. By measuring the weight of the object to be heated, the heating time, heat power, etc. can be automatically set without the user having to set the heating time etc. The aim is to make the operation simple and easy to use, and to be able to consistently and consistently heat the device.

Another object of the present invention is to realize a configuration of a weight measuring device that has high measurement accuracy and is highly practical.

Structure of the Invention In order to achieve the above object, the heating cooker of the present invention has a plurality of leaf springs installed in parallel at a certain interval in a space at the bottom of a heating chamber, both ends of which are fixed, and one vibrating mechanism. configure,
The vibration mechanism t supports the rotary mounting table, and a detector is provided to detect the vibration of the rotary mounting table, and the weight of the object to be heated in the heating chamber is calculated based on the output of the detector.
Calculate r, = output of heating source, heating style, corresponding to weight,
The configuration is such that the heating time and other factors are controlled. This not only allows for highly accurate weight measurement, but also allows for stable heating as the accurate heating time is automatically determined without having to set the heating time etc. one by one. be.

DESCRIPTION OF EMBODIMENTS Hereinafter, one embodiment of the present invention will be explained based on the drawings.

FIG. 2 is a partial sectional view of a heating cooker according to the present invention.

In FIG. 2, the heating chamber 11 is irradiated with one radio wave oscillated from a magnetron (not shown), which is a heat source, and the object to be heated is heated.
Cook 2. The object to be heated 12 is placed on a rotating plate 13, and the rotating plate 13 is placed one place on a rotating mounting table 14. A space is provided between the heating chamber bottom 15 and the main body bottom 16, and a vibration mechanism described below is housed in this space.

A mounting frame 17 is fixed to the back surface of the heating chamber bottom surface 15, and a block A18 is mounted to this mounting frame 17.
In this case, a plurality of leaf springs 31 are mounted in parallel with intervals, and the other ends are fixed to the block B19.

The block B19 also serves as a lower bearing and supports the shaft 21 with an upper bearing 20. A gear A22 is fixed to the shaft 21, and the gear A22 is engaged with a gear B23. Gear B
23 is connected to a motor 24 and drives the shaft 21 to rotate. The motor 24 is fixed to a motor mounting plate 25 provided integrally with the block B19.

The shaft 21 passes through an opening 26 provided in the center of the bottom surface 15 of the heating chamber, and is removably connected to the rotary mounting table 14 . A choke cavity 27 is provided in the opening 26 to prevent radio wave leakage. A magnet mounting plate 28 is integrally provided in the block B19, a magnet 29 is fixed to this, and a coil 30 is provided at a position facing the magnet 29.

FIG. 3 is an exploded perspective view showing the vibration mechanism of the cooking device of the present invention. Parts that are the same as those in Figure 2 are designated by the same numbers.

In FIG. 3, the block A18 and the leaf spring a1 are fixed to the mounting frame 17 by rivets 321 and screws 33). The block B19, leaf spring 31, motor mounting plate 25, and magnet mounting plate 28 are swaged together with rivets 34, and the shaft 21 and gear A22 are fixed thereto by the upper bearing 20.

FIG. 4 is a circuit diagram of a heating cooker according to the present invention. In FIG. 4, 35 is a display section placed on the operation section of the main body, 36 is a setting section also placed on the operation section,
Connect to microcomputer 37. The vibration of the magnet 29 generates a coil 30i, and the electric signal γ is small.
and is affected by radio waves and other factors. Therefore, the signal is first amplified by the amplifier circuit 381. Furthermore, a filter circuit 39 is used to remove the influence of radio waves and the like. Since the frequency caused by this vibration is as low as 1 to 100 degrees, a low-pass filter is used in this case.

The signal that passes through this filter circuit 39 is further shaped into a square wave by a waveform shaping circuit 40, and this signal is processed by a microcomputer 37.

41 is an oscillation circuit that generates a fundamental frequency for measuring the vibration frequency. Magnetron 4 that generates high frequency
1 is supplied with electric power from a high voltage transformer 42. 43 is a fan motor that cools the magnetron. 44 is a power supply relay 4 for supplying power to the magnetron.
5 is a single output control relay that controls the output of the magnetron.

The operation of the above configuration will be explained below.

The weight of the object to be heated is applied to block B via the rotary mounting table. Since the block B is supported by a leaf spring, the moment the object to be heated is placed on it, the object to be heated and the rotary mounting table vibrate at a vibration frequency corresponding to the weight of the object and the elasticity of the leaf spring. That is, the heavier the object to be heated t)S, the lower the frequency of vibration, and the lighter the object t)S, the higher the frequency of vibration. The magnet vibrates according to this vibration, generating a signal in the coil. This signal is input to the microcomputer via an amplifier, filter circuit, and waveform shaping circuit.

The microcomputer uses this signal and information from the setting section to perform storage, judgment, calculation, data input, and output. This output displays information on the display section, and also operates a power-on relay and an output control relay to control the output of the magnetron, heating style, heating time, etc.

It is a concern that the weight of the rotating plate, rotating mounting table, and vibrating device can be stored in the microcomputer and calculated to detect the weight of only the object to be heated.

In this way, according to this embodiment, it is possible to measure the weight of the object to be heated and automatically set the heating time, heat power, etc., which saves the trouble of setting each time. It is possible to realize a vibration mechanism that fits well even in a space, and since it is a vibration measurement, it can be input directly to a microcomputer as a digital waveform using a simple circuit, so it has the effect of enabling more accurate measurements.

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

(1) Since the weight of the object to be heated on the rotary mounting table can be detected as a vibration frequency using a vibration mechanism, it requires an extremely simple circuit compared to detection using displacement, etc., and can be directly transmitted to a microcomputer as a digital waveform. Since data can be input, there are no errors introduced during the process, and highly accurate measurements can be made.

(2) If the operation of the magnetron, which is the heat source, is controlled via a control unit such as a microcomputer by measuring the weight of the object to be heated, the user does not have to set the heating style and heating time each time. Also, optimal heating can be performed automatically.

By combining this with sensors such as temperature sensors, humidity sensors, gas sensors, and infrared sensors that detect changes during food heating, more complete automatic cooking can be achieved.

If the circuit is configured to prevent so-called dry-firing operation, in which the food is heated inadvertently with no object to be heated, the cooking device will be safer.

e3) With a single vibration mechanism in which a plurality of leaf springs are arranged in parallel, the leaf spring serves both as an elastic body that generates vibrations and as a donkey pal mechanism that keeps the rotating mounting table horizontal at all times. It has a simple configuration with fewer parts, and also has less frictional resistance during vibration, ensuring reliable operation. Additionally, since it can be made into a flat configuration, less storage space is required at the bottom of the heating chamber, resulting in a compact and easy-to-use cooker.

4. The rotating mounting table serves both as a turntable for rotating the object to be heated and as an upper plate for weight measurement, and the interior of the heating chamber has a simple configuration, and cleaning can be easily done by attaching and detaching the rotating mounting table. Naturally, it is convenient because there is no need to change the place of the object to be heated when measuring its weight and when heating it.

(5) Since the vibration mechanism is located outside the heating chamber and at the bottom, there is less heat transfer to the vibration mechanism, and measurement errors are less likely to increase due to thermal changes in leaf springs, etc.
This will ensure a long needle life.

The material for constructing the coat can also be made of a material with relatively low heat resistance, making it possible to construct the coat at a low cost.

(6) By fixing the block constituting the vibration mechanism to the bottom side of the heating chamber, it can be constructed integrally with the heating chamber, so even if a heavy object to be heated is placed thereon, it can be sufficiently supported. This can be made even more durable by drawing the bottom of the oven and changing the shape of the mounting frame.

Since it is integrated with the cylindrical heating chamber, the positioning accuracy of the shaft is easily achieved and reliable rotation can be obtained.

Since it is not directly connected to the bottom of the Saraco main body, external vibrations are less likely to be transmitted to the vibration mechanism, so measurement accuracy can be improved in this aspect as well.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of a conventional heating cooker, Fig. 2 is a partial sectional view of a heating cooker which is an embodiment of the present invention, and Fig. 3 is an exploded view of the vibration mechanism of the heating cooker. A perspective view showing
FIG. 4 is a circuit diagram of the heating cooker. 12...Object to be heated, 13...Rotating plate, 14
... Rotating mounting table, 16 ... Bottom of heating chamber, 18
...Block A, 19-...Block B, 21...
・Shaft, 29... Magnet, 30... Coil, 31...
... leaf spring, 37 ... microcomputer, 4
1... Magnetron. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] (1) A heating chamber that stores an object to be heated, a heating source for heating the object to be heated, a rotating mounting table on which the object to be heated is placed, and a space between the bottom of the heating chamber and the bottom of the main body. includes a rotational drive device that drives the rotating mounting table; the rotating mounting table is supported by a plurality of plate springs whose vibration frequency changes depending on the weight of the object to be heated; and the plate springs are installed in parallel with intervals. A vibration mechanism with both ends fixed, a detector for detecting the vibration of the rotary mounting table, a weight of the object to be heated is calculated based on the output of the detector, an output of the heating source corresponding to the calculated weight, A heating cooker configured to control heating style, heating time, etc. 2) One end of a leaf spring constituting the vibration mechanism is fixed to the bottom surface of the heating chamber, a drive shaft of a rotating mounting table is arranged at the other end of the leaf spring, and the drive shaft passes through the bottom surface of the heating chamber. The cooking device according to claim 1, wherein the cooking device is configured to be connected to the rotary mounting table.