JP2532787B2 - Heating cooker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker such as a microwave oven.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing the structure of a conventional cooking device. In FIG. 3 , a door 2 is provided on the front surface of the heating chamber 1 so as to be openable and closable. The heating chamber 1 is provided with a waveguide 3 connected thereto, and a magnetron 4 as a heating source is provided therein. The wave oscillated from the magnetron 4 is the waveguide 3
The inside of the heating chamber 1 is irradiated via. The object to be heated 5 is a rotating dish 6
It is placed on top of and is rotated by a motor 7 during heating in order to perform uniform heating. This heats the object to be heated 5 by radio wave, but according to such a conventional cooking device, the user sets the heating time according to the amount and weight of the object to be heated 5 with a time switch or the like. It had to be done and was troublesome.

FIG. 4 is a partial sectional view showing another example of the structure of a conventional heating cooker. In FIG. 4, a rotary plate 9 on which the object 8 to be heated is placed is supported by a shaft 10, and the shaft 10 is held by a bearing A11 and a bearing B12 so as to freely rotate and move in the thrust direction. The shaft 10 is provided with a gear A13,
It is connected to a gear B15 provided on the motor 14 and driven to rotate. Further, the shaft 10 is configured to receive a load in the load direction by a support plate 17 supported by a spring 16. The support plate 17 has a spring 16 depending on the weight of the object 8 to be heated.
Since it moves to a position where it can be balanced with the support plate 17
The weight of the object 8 to be heated can be detected by detecting the movement and position of the object. This detection output controls the operation of the magnetron, which is the heating source, and heating can be performed according to the amount and weight of the object to be heated, which is convenient because the heating time need not be set.

[0004]

However, according to such a conventional heating cooker, the shaft 10 has the gear A13 and the gear B.
15 engages with each other, and thus resists the vertical movement of the shaft 10, and the bearings A11, B12 and the shaft 10
Since frictional resistance is generated between and, the load of the object to be heated 8 is difficult to be accurately transmitted to the support plate 17, and there is a drawback that accurate weight measurement cannot be performed. For this reason, there is a problem that the heating time is incorrect and sufficient heating cannot be performed.

Further, in order to perform accurate weight measurement, the structure of the weight measuring unit and the structure of the weight detector are complicated and large in size, so that the heating cooker becomes large in size and a large space is required. There were issues such as being difficult to handle.

Therefore, a first object of the present invention is to provide a heating cooker capable of performing accurate weight measurement with a simple structure and performing stable heating without setting a heating time.

A second object of the present invention is to provide a compact and easy-to-handle heating cooker by constructing the weight measuring unit in a small size.

[0008]

To achieve the above object, the present invention provides a heating source for heating an object to be heated in a heating chamber, a rotary mounting table on which the object to be heated is mounted, and a rotary mounting table. A motor that drives the motor, an elastic body that integrally supports the rotary mounting table and the motor, and a detector that detects the displacement of the rotary mounting table, the motor, the elastic body, and the like are provided. The capacitor is formed to detect the capacitance of the capacitor and control the operation of the heating source.

In order to achieve the above object, the present invention provides
Further, the detector is composed of a magnet and a detection coil, and the operation of the heating source is controlled by the output of the detection coil.

[0010]

The heating cooker according to the present invention comprises a weight to be heated, a rotary mounting table and a motor integrally supported by an elastic body, and a detector for detecting the displacement of the rotary mounting table, the motor, the elastic body and the like. By installing a detection device, friction resistance generated between bearings and gears can be eliminated, and accurate weight measurement can be performed, and even if you do not set the heating time, the accurate heating time is automatically determined and stable. It has the effect that it can be heated.

Further, since the detector is composed of a condenser or magnet composed of a plurality of parallel plates and a detecting coil, a minute mechanical change is converted into an electric output, so that the weight can be surely detected and the detector is flat. It is possible to realize a compact and easy-to-handle heating cooker that can be configured in a small size.

[0012]

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

FIG. 1 is a partial sectional view of a heating cooker according to the present invention. In FIG. 1, a door 2 is provided in front of the heating chamber 21.
2 is openable and closable. The heating chamber 21 is irradiated with radio waves oscillated from a magnetron (not shown) which is a heating source to heat the object to be heated 23 with high frequency. The object to be heated 23 is placed on the rotary plate 24, and the rotary plate 24 is placed on the rotary mounting table 25. The rotary mounting table 25 is directly fitted to a shaft 28 of a motor 27 penetrating an opening 26 provided on the bottom surface of the heating chamber 21, and is driven to rotate by the motor 27.
The motor 27 integrally connected to the rotary mounting table 25 is held by a support plate 30 supported by an elastic body such as a coil spring 29. The load of the object to be heated 23 is applied to the support plate 30 together with the weights of the rotary plate 24, the rotary mounting table 25, and the motor 27. The support plate 30 moves up and down according to the elasticity of the coil spring 29 and the load. Reference numeral 31 is a detector in which a capacitor is formed by electrodes of a plurality of parallel plates. One of the parallel plates is fixedly provided on the support plate 30 side and the other is fixedly provided on the bottom surface side of the main body. Vary the spacing between the plates.

As a result, the change in the electrostatic capacitance of the capacitor formed between the electrodes of the parallel plates is detected as a weight signal of the detector 31, and the signal is used to control the operation of the magnetron through the control circuit.

Further, the present invention is characterized in that the mechanical change is converted into the electrostatic capacitance change of the capacitor to detect the weight, so that it corresponds to the support plate through the support plate 30 and the spacer. A flat plate capacitor is formed by two plates including a flat plate provided on the flat plate capacitor, and the deflection of the support plate is also used as an elastic body. It is possible to adopt a configuration in which a change in electrostatic capacitance is detected and the operation of the magnetron is controlled via the control circuit by this signal.

With the above construction, a minute mechanical change can be surely converted into an electric change, so that the detection accuracy becomes very good.

FIG. 2 is a partial sectional view showing another embodiment of the heating cooker according to the present invention. In FIG. 2, the rotary table mount 25 'is the shaft 2 of the motor 27' passing through the opening 26 '.
It is the same as that directly fitted to 8'and rotated by a motor 27 '. Motor 27 'is block A3
2, the block A32 is a plurality of leaf springs 3
4 is connected to block B33 by
33 is fixed to the bottom 37 of the main body. Since the block A32, block B33, and leaf spring 34 constitute a Roberval mechanism, the motor 27 'fixed to the block A32 vertically and elastically moves. A magnet 35 is provided in the block A32, and a detection coil 36 is provided opposite to the magnet 35. The motor 27 'moves downward according to the weight of the object to be heated 23' by the action of the Roberval mechanism, so
5 is also moved, and a current is generated in the detection coil 36 by the movement of this magnet.

The operation of the above configuration will be described below. The weight of the object to be heated is applied to the motor via the rotary mounting table, and since the motor is supported by the elastic body, it moves downward depending on the weight. A detector detects the amount of displacement and the vertical frequency of the motor that occurs during the displacement, and the total weight is detected from the detected amount. If the weights of the rotary plate, the rotary mounting table, and the motor are measured in advance, the weight of only the object to be heated can be detected from the total weight.

By controlling the oscillating operation of the magnetron via the control unit by this output, it is possible to heat the object to be heated for an optimum heating time according to the weight of the object. The detection coil 36 detects the displacement amount and frequency of the magnet. Since the frequency of an object is determined by the strength of the elastic body supporting it and the weight of the object, the weight can be known by measuring the frequency.

As described above, according to this embodiment, since the weight of the object to be heated is directly applied to the elastic body without the frictional resistance of the bearing or the gear being interposed therebetween, the correlation of the displacement of the elastic body with respect to the weight is good. Therefore, it is possible to detect a more accurate weight, and it is possible to perform heating in an optimum heating time according to the object to be heated.

In the embodiment, the structure in which the motor and the rotary mounting table are directly connected is shown. However, even if the structure is such that a transmission is made via a gear in the middle, if these transmission means are integrally supported by an elastic body, the above-mentioned structure can be obtained. The same effect is still exhibited.

[0022]

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

(1) Since the motor and the rotary mounting table are integrally supported directly by the elastic body, a gap can be provided between the shaft and the opening, and when the load of the object to be heated is applied to the elastic body,
The load can be directly transmitted to the elastic body without the frictional resistance of the bearing or the gear being inserted in the middle of the vertical movement.

Therefore, the correlation between the displacement of the elastic body and the frequency is improved with respect to the weight, and accurate weight measurement can be performed.

(2) Since the detector has a structure in which a capacitor is formed by a plurality of parallel plate electrodes and the capacitance between the parallel plate electrodes is detected as the output of the detector, the rotary mounting table, the motor, the elasticity The vertical movement and the vibration frequency can be detected without applying a force that suppresses the vertical movement and vibration of the body.

Therefore, the amount of displacement or the frequency of vibration of the object to be heated can be detected stably with little error or attenuation, and more accurate weight measurement can be performed.

(3) By controlling the operation of the magnetron, which is a heating source, by measuring the weight of the object to be heated, the heating can be performed for an optimum time without setting the heating time for each. Therefore, it is convenient and easy to use without troublesome work.

Further, if the circuit structure is configured to prevent the so-called air-burning operation in which the object to be heated is unintentionally heated, the device will be more safe.

(4) The reduction of the frictional resistance in the bearings and gears requires less torque required to rotate the rotary mounting table, and a small motor is sufficient, so that a resource-saving, energy-saving and economical device can be obtained. Together with this, it becomes a compact and easy-to-use device.

(5) Since the detector forms a capacitor by electrodes formed by a plurality of parallel plates, the detector can be made flat and small in size, and can be sufficiently arranged even in a narrow space. A space-saving, compact and easy-to-use device can be realized.

(6) By using a Roberval mechanism composed of a plurality of leaf springs as the elastic body, it is possible to smoothly support the vertical vertical movement of the motor with a simple structure, so that the load is stably supported horizontally. be able to. Also, since the leaf spring constitutes both the Roberval mechanism and the role of an elastic body for measuring the weight, the leaf spring has a thin structure especially in the vertical direction, and has a shape that can be easily accommodated in the bottom of the device, and as a whole, A compact and thin cooker can be realized.

(7) If the detector is configured to detect with a magnet and a detection coil, a large detection output can be obtained, for example, in the case of detecting the vibration frequency of a load, and the detection can be performed without contact with the vibration part. Therefore, more accurate detection can be performed without damping the vibration.

(8) The magnet and the detection coil can also be made flat and small in size, and can be arranged at any position in the weight measuring mechanism as long as the displacement amount and the frequency are detected. The height of the bottom surface of the cooker can be reduced, and the cooker can be space-saving, compact, and easy to handle. (9) The motor, elastic body, and detector are provided outside the heating chamber.
Therefore, it suffices to provide only a rotary mounting table in the heating chamber.
The structure inside the heating chamber is simple,
You can prevent sparks and clean even if it gets dirty.
Easy to handle, so easy to handle. In addition, connect the magnet and the detection coil.
The close proximity allows the magnetic field to act reliably on the sensing coil
Therefore, reliable detection can be performed.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a heating cooker according to an embodiment of the present invention.

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

FIG. 3 is a cross-sectional view showing a conventional heating cooker.

FIG. 4 is a sectional view showing another structure of a conventional heating cooker.

[Explanation of symbols]

 21 heating chamber 23 heated object 25 rotary mounting table 27 motor 29 coil spring (elastic body) 30 support plate 31 detector 35 magnet 36 detection coil

Front page continued (72) Inventor Kenji Watanabe 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. ) Reference JP-A-58-46591 (JP, A) Actually opened 58-133702 (JP, U) Actually opened 56-109023 (JP, U) Actually published 58-13212 (JP, Y2)

Claims (2)

(57) [Claims] 1. A heating chamber, a heating source for heating an object to be heated in the heating chamber, a rotary mounting table for mounting the object to be heated in the heating chamber, and a motor for driving the heating mounting table. ,
An elastic body that integrally supports the rotary mounting table and the motor, and a detector configured of a capacitor that detects displacement of the mounting table, the motor, the elastic body, and the like are provided to respond to changes in the capacitance of the capacitor. The control unit controls the operation of the heating source by the output of the detector.
The motor shaft that penetrates without using a bearing between the bottom and
A heating cooker configured to be directly fitted to the motor via the above . 2. A heating chamber, a heating source for heating an object to be heated in the heating chamber, a rotary mounting table for mounting the object to be heated in the heating chamber, and a motor for driving the rotary mounting table. ,
An elastic body that integrally supports the rotary mounting table and the motor, and a detector that detects displacement of the mounting table, the motor, the elastic body, etc. are provided, and the detector is configured by a magnet and a detection coil, and the detection is performed. The rotary mounting table includes a heating chamber that controls the operation of the heating source according to the output of the coil.
Penetrate the bottom surface of the
The structure that directly fits the motor through the existing motor shaft
The heating cooker.