JPS6134887A - High frequency heater - 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 Field of Industrial Application 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.
The object to be heated 5 to be irradiated inside 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 conventional high-frequency heating devices, the user sets the heating time according to the amount and weight of the object to be heated 5 using a time switch or the like. It was necessary and troublesome.

Purpose of the Invention The present invention is intended to solve the above-mentioned conventional drawbacks, and aims to measure the weight of the object to be heated, set the heating time, and automatically heat the object even if the object is not used. be.

Structure of the Invention In order to achieve the above object, the high-frequency heating device of the present invention includes a rotating mounting table supported by an elastic body, and a detector detecting the frequency of vertical vibration of the rotating mounting table when an object to be heated is placed on the rotating mounting table. Accordingly, the weight of the object to be heated is measured, and the heating time is automatically determined without having to set the heating time each time.

Then, a pressing mechanism is provided that is linked to the opening and closing of the door.
When the door is open, the rotary mounting table is pushed down or pushed up, and when the door is closed, it is quickly returned to its original position, and this action activates the vertical vibration of the rotary mounting table. Furthermore, the pressing force of the pressing mechanism is generated through an elastic body. This configuration has the effect of generating stable and reliable vibrations and measuring the stable and reliable frequency of vibrations, thereby increasing measurement accuracy and making it possible to perform stable heating with a more stable heating time.

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

FIG. 2 is a partial sectional view of the high frequency heating device according to the present invention. In FIG. 2, a door 12 is provided at the front of the heating chamber 11 so as to be openable and closable. Radio waves oscillated from a magnetron (not shown) are irradiated into the heating chamber 11 to heat the object 13 at high frequency.

The object to be heated 13 is placed on a rotating plate 14, and the rotating plate 14 is placed on a rotating mounting table 15. The rotary mounting table 15 is fitted onto a shaft 17 of a motor 16, and is driven to rotate by the motor 16. The motor 16 is fixed to the block A18, and is connected to the block B2 by a plurality of leaf springs 19.
0, and the block B20 is fixed to the bottom part 21 of the main body. Block A1B, block B20. Since the plate spring 19 constitutes a donkey pal mechanism, the motor 16 fixed to the block A18 moves vertically and elastically. Block A 1.8 is provided with a magnet 22,
A detection coil 23 is provided opposite to this. Motor 1
6 shifts downward depending on the weight of the object to be heated 13. Further, the motor 16 vibrates at a frequency depending on the weight of the object to be heated 13 and the elasticity of the leaf spring 19. The detection coil 23 is connected to this magnet 2.
The amount of displacement or vibration frequency of 2 is extracted as an electrical signal.

Furthermore, a lever 24 is provided to push down the tip of the block A18, and the lever 24 is provided with a contact portion 24a, and a cam 25 is provided at a position opposite to the contact portion 24a.

The lever 24 is rotationally displaced about the shaft support 24b.

The shaft support 24b is slidable in the vertical direction,
It is pushed upward by a compression spring 24c.

The cam 25 is connected by a groove 28 to a pin 27 which is rotationally driven by an arm lever 26.
It is designed to be slightly wider than the original, with a gap or so-called play.

The upper end of the arm lever 26 is rotatably connected to a door arm 29 provided on the door 12. The door arm 29 is disposed within the main body and slides on nine rollers 30 so that the door 12 can be opened and closed smoothly.

The door arm 29 is urged in the pulling direction by the door spring 31. The operation of the above configuration will be explained below. When the door 12 is open, the arm lever 26 moves to the position shown by the two-dot chain line, the pin 27 rotates, the cam 25 rotates, and the abutment part 24a of the lever 24 is pushed down, so the lever 24 is moved to the position shown by the two-dot chain line. Accordingly, the block A1B moves to the position indicated by the two-dot chain line. When the door 12 is closed, the rotary mounting table 15 has a level difference with the bottom surface of the heating chamber, but as the block AIB moves as described above, the rotary mounting table 15 approaches the bottom surface of the heating chamber. On the other hand, when closing the door 12, the arm lever 26 is moved by the door arm 29, the cam 25 is rotated, and the lever 24 is returned to its original position.

At this time, since there is play between the pin 27 and the groove 28, when the concave part of the cam 25 touches the abutting part 24a, the cam 25 slides down along the slope, and the cam 25 moves forward by this force by the amount of play. As it rotates, the contact portion 24a slides down the cam 25 at once. In this manner, when the abutting portion 24a returns, it returns quickly. As a result, block AIB, rotary mounting table 15, heated object 1
3 suddenly returns upwards when the door 12 is closed,
At this time, vertical vibration occurs. The vibration frequency generated at this time is detected by the detection coil 23 as the movement of the magnet 22, and the overall weight is measured from the direction of vibration.

Here, the shaft support 24b of the lever 24 can be slid upwardly and downwardly, and is pushed upward by a compression spring 24c. Therefore, when the cam 25 pushes down the abutment part 24b, the greater the force with which the lever 24 is pushed upward by the leaf spring 19, the lower the shaft support 24b becomes.
The push down of the block A18 by the lever 24 is reduced. In other words, if the weight of the object to be heated, such as the object to be heated 13, placed on the rotating mounting table 15 is small, the block A1B will tend to rise upward, causing the shaft support 24b to fall; on the other hand, if the weight is large, the block A18 will tend to fall downward. Therefore, the axis branch 2
4b goes up. Therefore, depending on the weight of the object to be placed on the rotary mounting table 15, the lever 24 can be used to block A1.
The amount of depression of 8 does not change much, so the block AI
B. The rotary mounting table 15 and the object to be heated 13 perform vertical vibrations with a constant and more stable amplitude, so that stable and reliable weight measurement can be performed.

FIG. 3 shows another embodiment of the high-frequency heating device according to the present invention, and is an exploded perspective view showing the main components.

In FIG. 3, parts that are the same as those in FIG. 2 are indicated by the same numbers with a dash added.

In FIG. 3, a door 12' is provided so as to be openable and closable with respect to the heating chamber, and a door arm 29 is mounted on a roller 3o provided on the main body.
′ slides, making opening and closing smooth.

The motor 16' is fixed to the block A18' and connected to the block B 20' by a plurality of leaf springs 19', and the block B20' is also fixed to the bottom part 21' of the main body. An arm lever 26' is rotatably connected to the door arm 29'.
A cam 41 is provided integrally with the lever 26' to rotate the lever 26'. The lever B42 is brought into contact with the cam 41, and the lever B
42 is rotatably supported by a pin 44 fixed to the shaft 43.

The lever C spring 45 is a coil spring that pulls the lever B42 in the direction of the cam 41. A lever C46 made of a spring material is fixedly provided at the other end of the shaft 43, and the tip thereof is connected to the abutment part 18 integrally formed with the block A18'.
'a, and the lever C spring 47 pushes the abutment part 18
It is biased in the direction away from 'a.

FIG. 4 is a perspective view showing a part of the cam and lever of the high-frequency heating device according to the present invention.

In FIG. 4, the cam 41 is provided with a small diameter part 51 and a large diameter part 52, which are brought into contact with the side surface 48 of the lever B42, and the rotation of the cam 41 moves the lever B42 in the radial direction of the cam 41. The narrow diameter portion 51 is configured with a thrust surface A53, the large diameter portion 52 is configured with a thrust surface B54 provided with a step, and an inclined surface 55 connecting the thrust surface A53 and the thrust surface B54 is provided. This thrust surface A53, thrust surface B54,
The inner surface 49 of the lever B42 comes into contact with the inclined surface 55, and the lever B42 moves in the neutral direction.

FIG. 5 shows block A18 of the high frequency heating device according to the present invention.
It is a side view showing part of the handle part 18'a and lever C46 of '.

In FIG. 5, a indicates the operating state of the contact part 18'a and the lever C46 when the object to be heated (not shown) is light. This is indicated by the dotted chain line. b similarly shows the case where the object to be heated is heavy, and the amount by which part 18'a is pressed down by lever C46 is xl and x2, respectively.
It is shown in

The operation of the embodiment shown in FIGS. 3, 4, and 5 will be explained below.

The sliding path of the lever B42 on the cam 41 is shown by a dashed arrow. FIG. 3 shows a state in which the door 12' is closed, and the side surface 48 of the lever B42 is in contact with the narrow diameter portion 51 by the biasing force of the lever C spring 47. The path on cam 41 is a mermaid. In this state, the lever C46 is separated from the contact portion 18'a.

Next, when the door 12' is opened to the half-open position, the cam 41
The large diameter portion 52 pushes the lever B42 outward in the radial direction. The path on the cam 41 is point B. This causes the lever B42 to rotate to the left, and this rotational force is applied to the shaft 4.
3, the lever 046 is rotated, and its tip presses down the contact portion 18'a. As a result, the rotary mounting table (not shown) is pushed down to near the bottom of the heating chamber. Then, at point B, the inner surface 49 of the lever B42 moves from the thrust surface A53 to the thrust surface B54 due to the force of the lever C spring 45.

When the door 12' is fully opened, the cam 41 rotates further and the path on the cam 41 reaches the zero point. When the door 12' begins to close, the path makes a U-turn, but since the side surface 48 of the lever B42 slides only on the large diameter portion 52, the lever B42
does not move, so the abutting portion 18'a remains pressed down.

Then, when the door 12' is closed just before closing, the path reaches the zero point. Then, the inner surface 49 of the lever B42 becomes the inclined surface 55.
The inner surface 49 overcomes the tensile force of the lever spring 45 and moves from the thrust surface B54 to the thrust surface A53.At the same time, the side surface of the lever B42 is removed from the large diameter portion 52, and by the force of the lever C spring 47. Move to point A of the narrow diameter portion 51. At this time, the lever B42 moves instantly and quickly, and the lever C46 moves accordingly.
``a'' is quickly released from being held down. By the way, if the object to be heated is light, the abutting part 18'a is at a high position, so when the object is pressed down with the lever C46, the lever C46 will be greatly bent by the reaction force of the leaf spring 19, and if the object to be heated is heavy, the lever C46 will bend. The deflection of C46 is small, therefore, the lever C4 of the holding portion 18'a in each case
The depression amounts X1 and X2 due to 6 have similar values.

In this way, according to this embodiment, the pressing is quickly released by closing the door, so at this time, the rotary mounting table generates a unique vertical vibration depending on the weight of the object to be heated and the elasticity of the leaf spring. Then a tortoise is formed. In this case, a constant amount of depression that is not greatly affected by the weight of the object to be heated can be obtained, so the amplitude of the vertical vibration can be stable and reliable, so by detecting this frequency with a detector, Measure weight stably and reliably,
This has the effect that the heating time can be automatically set without having to set the heating time each time.

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

(1) When placing the rotating plate or heated object on the rotating mounting table,
Since the rotating mounting table often vibrates up and down, it has good stability, and there is no fear of 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.

(2) Due to the action of the pressing mechanism that quickly returns the rotary mounting table when the door is closed, a reliable vibration is generated at the time of return, and a large signal can be obtained as a signal from the detector. Therefore, external vibrations that may be applied depending on the installation location of the main body, so-called noise vibrations, can be clearly distinguished (the S/N ratio becomes large), so that highly accurate detection can be performed. Furthermore, since constant pressing is obtained that is not affected by the weight of the object to be heated, vibrations with a constant amplitude can be obtained, allowing for more accurate and reliable detection.

(3) When the amplitude of the vibration of the rotary mounting table and the object to be heated changes depending on the weight of the object to be heated, the vibration will be large in some cases, and small in other cases,
However, according to the present invention, a constant amplitude can be obtained and the product placement is high, although it is difficult to use as a product because it gives a sense of anxiety to the user.

(4) In addition, if the minimum detectable amplitude is regulated, and the amplitude changes depending on the weight of the heated object, the amplitude will inevitably increase when the weight is light. However, according to the present invention, this can be prevented.

(5) By configuring the part of the pressing mechanism that acts on the rotary mounting table with a leaf spring, a constant amplitude that is not affected by the weight of the heated object can be obtained by the vibration of the rotating mounting table and the heated object with a simpler structure. .

(6) In this case, since the structure is simple, it is advantageous in terms of life and reliability, and the cost can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of a conventional high-frequency heating device, Fig. 2 is a partial sectional view showing one embodiment of the high-frequency heating device of the present invention, and Fig. 3 is the main structure of another embodiment of the same device. FIG. 4 is a perspective view showing a portion of the cam and arm lever of the device, and FIG. 5 is a side view showing a portion of the abutting portion and lever C of the device. 12...Door, 13...Heated object,
15... Rotating mounting table, 16... Motor, 18... Block A119... Leaf spring, 20... Block B124... ...Lever, 24c...Compression spring, 25...
Cam, 26...Arm lever, 29...
・Door arm, 41...Cam, 42...
...Lever B143...Shaft, 46...
...Lever C0 Name of agent: Patent attorney Satoshi Nakao and 1 other person No. 5
Figure (α)

Claims (2)

[Claims] (1) A heating chamber, an oscillator that supplies radio waves to the heating chamber, a door that opens and closes the heating chamber, a rotating mounting table on which the object to be heated is placed in the heating chamber, and supporting the rotating mounting table. An elastic body, a detector for detecting movement of the rotary mounting table or the elastic body, and a pressing mechanism that operates in conjunction with the door, and the pressing mechanism presses the rotary mounting table when the door is opened. push down or push up,
A high-frequency heating device comprising a quick-acting mechanism that returns quickly when a door is closed, and the pressing force of the pressing mechanism is applied to a rotating mounting table via an elastic body. (2) The high-frequency heating device according to claim 1, wherein the portion of the pressing mechanism that acts on the rotary mounting table is constituted by a plate spring.