JPS60263028A - High-frequency heating device - Google Patents

Abstract

PURPOSE:To eliminate a stepped difference between a rotary table and the bottom surface of a heating chamber upon insertion and withdrawal of a substance to be heated and improve the stability of the heating device by providing a constitution through which the rotary table is pushed down upon opening a door. CONSTITUTION:Roberval mechanism is constituted of blocks 29, 31 and leaf springs 30. The block 29 is provided with a magnet 33 and a detecting coil 34, opposing to the magnet. A motor 27 is displaced downward by the operation of the Roberval mechanism in accordance with the weight of the substance 23 to be heated. The motor 27 oscillates with a frequency in accordance with the weight of the substance 23 to be heated as well as the elasticity of the leaf springs 30. The detecting coil 34 takes out the amount of displacement of the magnet 33 or the frequency of the oscillation. The operation of oscillation of a magnetron is controlled by the output and the substance 23 is heated for the period of optimum time in accordance with the weight of the substance to be heated. When the door 22 is opened, a protuberance 37 abutts against a lever 36 to push down the block 29 by the pivoting of a lever, whereby the stepped difference (h) between the rotary table and the bottom surface of the heating chamber may be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to high frequency heating devices such as microwave ovens.

Conventional Structure and Its Problems FIG. 1 is a cross-sectional view showing the structure of a conventional high-frequency heating device. In Figure 1, there is a door 2 in front of the heating chamber 1.
It can be opened and closed freely. A waveguide 3 is connected to the heating chamber 1, and a magnetron 4 is provided thereto. The radio waves oscillated from the magnetron 4 are sent to the heating chamber 1 via the waveguide 3.
Irradiate inside.

The object to be heated 5 is placed on a rotating plate 6, and is rotated by a motor 7 during heating to uniformly heat the object. In this way, the object to be heated 5 is heated by radio waves, but according to such a conventional high-frequency heating device, all users set the heating time according to the amount and weight of the object to be heated 5 one by one using a time switch or the like. It was necessary and troublesome.

FIG. 2 is a partial cross-sectional view showing another example of the structure of a conventional high-frequency heating device. In FIG. 2, the object to be heated 8 is placed on a six-rotation plate 9, and placed on a rotary mounting table 10 with nine rotation plates. A rotary loading poy O is supported by a shaft 11, and this shaft 11 is held freely rotatable and movable in the thrust direction by a bearing A12 and a bearing B13. A gear A14 is provided on the shaft 11, and is connected to a gear B16 provided on a motor 15 to rotate the shaft 11. Furthermore, the load direction of the shaft 11 is determined by the spring 17.
The structure is such that the load is supported by the support plate 18 supported by the support plate 18. The support plate 18 moves according to the weight of the object to be heated 8 to a position where it is balanced with the spring 17. The rotary mounting table 10 and the support plate 18 are shown in solid lines when there is no object to be heated 8.
A state in which the load of the object to be heated 8 is applied is shown by a two-dot chain line.

By detecting the movement and position of the support plate 18, the weight of the object to be heated 8 can be detected. The operation of the magnetron can be controlled based on this detection output, and heating can be performed according to the amount and weight of the object to be heated, which is convenient as it eliminates the need to set the heating time.

However, according to such a conventional high-frequency heating device, when there is no load, the rotary plate 9 and the rotary mounting table 10 are oriented northward at the position indicated by the solid line, so it is necessary to open the door and take the rotary plate 9 out of the heating chamber. When taking it out, it is difficult to pull it out because there is a step between it and the bottom of the heating chamber and the door. Since the rolled rotary mounting table 10 is supported by a spring 17, it moves vertically when the rotary plate 9 or the object to be heated 8 is placed on it, making it unstable, making it inconvenient to use, and giving an unpleasant feeling of operation. There was a drawback that there was no

OBJECT OF THE INVENTION The object of the invention is to solve the above-mentioned drawbacks of the conventional technology, and to provide a device with a simple structure, improved usability, 2. accurate weight measurement, and stable heating without setting a heating time. The purpose is to

Structure of the Invention In order to achieve the above object, the high frequency heating device of the present invention has the following features:
The weight of the object to be heated is measured by providing a weight detection device consisting of a rotating mounting table supported by an elastic body and a detector that detects the movement of the rotating mounting table or the elastic body.
The heating time is automatically determined without having to set the heating time each time, and there is also a push-down mechanism that is linked to the opening and closing of the door, and a #4 mechanism that pushes down the rotating mounting table when the door is open. This has the effect of improving usability by eliminating the difference in level between the rotary mounting table and the door or the bottom of the heating chamber when the door is opened to take in and take out the heated object, and by improving stability.

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

FIG. 3 is a partial sectional view of a high frequency heating device according to the present invention.

In FIG. 3, a door 22 is provided at the front of the heating chamber 21 so as to be openable and closable. Radio waves oscillated from a Macnetron (not shown) are irradiated into the 7XI heat chamber 21 to heat the object 23 at high frequency. The object to be heated 23 is placed on a rotating plate 24, and the rotating plate 24 is placed on a rotating mounting table 25. The rotary mounting table 25 is directly fitted onto the shaft 28 of the motor 27 that passes through an opening 26 provided in the bottom of the heating chamber 21, and the shaft 28 of the motor 27 is connected to the motor).
It is driven to rotate by. The motor 27 is fixed to a block A29, the block A29 is connected to a block B31 by a plurality of leaf springs 30, and the block B31 is fixed to the bottom 32 of the main body. Block A
29, the block B31, and the leaf spring 30 constitute a donkey pal mechanism, so the motor 27 fixed to the block A29 moves vertically and elastically. Block A
29 is provided with a magnet 33, and a detection coil 3 is mounted opposite to the magnet 33.
4 (i- provided. Due to the action of the donkey pal mechanism,
The motor 27 moves downward depending on the weight of the object 23 to be heated. In addition, the motor 27 is operated by the weight of the object to be heated 23 and the leaf spring 300.
It vibrates at a frequency that corresponds to its elasticity. The detection coil 34 extracts the displacement or vibration frequency of the magnet 33 as an electrical signal.

Furthermore, the block A29 is provided with a contact part 35, a lever 36 is provided at a position opposite to this, and the other end is made to face a protrusion 37 provided on the door 22.

38 is a tension spring that pulls up the lever 36 to the position shown by the solid line.

The operation of the above configuration will be explained 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 an elastic body, it shifts downward in accordance with the weight. The motor also vibrates at a unique frequency depending on the weight of the object to be heated and the elasticity of the leaf spring. This amount of displacement and vibration frequency are detected by a detection coil, and the overall weight is detected from the output. rotating plate or rotating mounting table,
If the weight of the motor is measured in advance, the weight of only the object to be heated can be detected from the overall weight.

By controlling the oscillation of the magnetron using this output via the control section, the object to be heated can be heated for an optimal time depending on the weight of the object.

When the door is open, the protrusion hits the lever, the lever rotates, and the other end pushes against the stopper, pushing block A down. The free state with the door closed is shown by a solid line, and the state with the door open is shown by a two-dot chain line. In the free state, there is a step difference π between the rotary mounting table and the bottom surface of the heating chamber, but when the door is open, they are on the same level.

FIG. 4 is a partial sectional view showing another embodiment of the high frequency heating device according to the present invention.

In FIG. 4, the motor 27' is fixed to a block A29' supported by a leaf spring 30'. Block A29
A contact portion 35' is integrally provided at ', and a magnet 33' is fixed thereto. Similarly, a detection coil 34' is provided opposite the magnet 33'.

An arm 41 (!-) is provided on the door 22' so as to be freely rotatable, and it can be smoothly opened and closed by sliding on a roller 42 provided on the main body.A door spring 43 is provided on the arm 41. This negates the weight of the door 22' when it is opened and closed, making the operation lighter and ensuring the closing.Abutment part 35
A lever B44 is rotatably supported at a fulcrum 46 at the upper part of the lever B44, and the lower end 46 of the lever is opposed to the abutting part 35', and the upper end 47 of the lever is rotatably engaged with the arm 41.

With this configuration, when the door 22' is open, the lever B44 moves in the position indicated by the two-dot chain line. As a result, the lower end of the lever 46 pushes down the abutment part 35', so that the motor unit 7' is also pushed down and the rotating mounting table (not shown) is pushed down.
is pushed down. Since the levers B and 44 are configured to move by being engaged with the door arm 41, a lever action is activated and the rotary mounting table can be reliably pushed down with a light force that does not feel any resistance during operation. have

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

[1] When the door is opened to take out or take out the rotary plate or heated object, the rotary mounting table is pushed down, so there is no step between the bottom of the heating chamber and the rotary mounting table. Since it can be placed on the same surface, it can be pulled out while sliding. If the door has a front-opening structure and is flush with the inner surface of the door when open, it can be pulled out smoothly from the heating chamber by opening the upper surface of the door, so it can be used to remove heavy objects or objects that are hot. This makes the device safer to operate and easier to use, even in the worst cases.

[When placing the 2J rotating plate or heated object on the rotating mounting table,
The rotary mounting table does not vibrate up and down, so it is very safe, and there is no need to worry about spilling heated objects such as liquids, and there is no sense of instability, making it easier to operate and easier to use.

It is also easy to clean the inside of the heating chamber.

[3] When measuring the weight of the heated object using the 1-lower vibration frequency of the heated object or rotating mounting table, the push-down mechanism is released all at once when the door is closed, so you can be certain that Vertical vibration occurs and a large signal can be extracted as a signal for the detector, allowing accurate detection. If you install a door switch that rhythmically opens and closes the door, you can easily synchronize the timing so that the control unit reads the detector signal at the same time as the door closing signal, allowing more accurate detection and making it easier to measure weight. Accuracy will be extremely high.

C4J? II By measuring the weight of the heated object and controlling the operation of the magnetron, which is an oscillator, via the control unit, the optimal heating time can be automatically set without having to set the heating time each time, which eliminates the hassle of Convenient and easy to use without any hassle.

Accidentally heating the shredded material to be heated when it is not in the container.
A circuit configuration that prevents so-called dry firing operation will result in a much safer device.

[5] Since the mechanism for pushing down the rotary thieves table is configured to be linked to the opening and closing of the door, the operation is easy as the operation is carried out naturally and unconsciously during the normal operation of putting in and taking out heated objects. easy to use.

[6] By using a mechanism in which the lever is operated by the movement of the door arm, the lever has a lever effect and is operated with an extremely light operating force, making the device easier to use.

Since it is composed of a combination of a swivel arm and a lever, the position of the push-down part of the lever can be selected freely to a certain extent, so there are fewer structural restrictions such as the motor part, making it possible to design a simple structure. Since it also acts as a force, it can be constructed economically without requiring a separate spring.

[Brief Description of the Drawings] Fig. 1 is a sectional view showing the structure of a conventional high-frequency heating device, Fig. 2 is a partial sectional view showing another conventional example of the same device, and Fig. 3 is a high-frequency heating device of the present invention. FIG. 4 is a partial cross-sectional view showing another example of the structure of the device. 22...door, 23 object to be heated, 25 rotating mounting table,
27...Motor, 29 Block A130 leaf spring, 3
1 Block B135 Abutment part, 36 levers, 41 ・
Door arm, 44 lever B. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (2)

[Claims] (1) a heating chamber and an oscillator that supplies radio waves to the heating chamber;
A door for opening and closing the heating chamber, a rotating mounting table for placing a heated object in the heating chamber, an elastic body for supporting the rotating mounting table, and a detector for detecting movement of the rotating mounting table or the elastic body. and a push-down mechanism that operates in conjunction with the door, the push-down mechanism operating to push down the rotary mounting table when the door is opened. (2) Door and door Y that supports opening and closing of the door
2. The high-frequency heating device according to claim 1, wherein an arm and a lever interlocked with the Y-arm are provided, and a push-down mechanism is constituted by the door arm butt bar.