JPS62184797A - Radio 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 is a high-frequency heating device mainly applied to heating food, and in which a turntable is used to rotate the food in order to uniformly heat the food. Equipped with
It is related to the method.

Conventional Technology Conventionally, a turntable system in which food is rotated in a heating chamber has been widely used as a means of uniformly heating food. The high frequency electromagnetic waves pass through the cover 2 made of a low dielectric loss material and enter the heating chamber 3.

A motor 5 is provided with a turntable 4 for rotating food (not shown) at the bottom of the heating chamber 3. The motor 5 and the turntable 4 are connected by a pulley shaft 6 passing through the bottom wall of the heating chamber. and rotate. turntable 4
A plurality of rollers 7 are provided below to reduce rotational torque, and when the turntable 4 rotates, the rollers 7 also rotate according to the rotation.A roller ring is provided so that the roller 7 rotates stably. The roller 7 is rotatably attached to the turntable 4.
The turntable 4 has a circular shape, and the bottom surface of the turntable 4 is provided with concavities and convexities that connect with the pulley shaft 6, so that it can be easily attached and detached. In FIG. 8 regarding the mounting structure of the roller ring 8 and the rollers 7, three cylindrical bosses 9 are provided on the outer side of the roller ring 8. A groove 10 is provided circumferentially at the tip of the boss 9. The roller 7 was placed in the boss 9, and a washer 11 was used to prevent the roller 7 from coming off the boss 9.

Furthermore, FIG. 8 (Japanese Patent Application No. 60-1
No. 45624), the bosses 13 provided at three locations on the outside of the roller ring 12 are divided into two parts, and the tip is thickened to prevent the roller 7 from coming off when it enters the boss 13. . When the roller 7 is inserted into the boss 13, the tip of the divided boss 13 is thick, so the roller 7 does not come off.

Problems to be Solved by the Invention However, in the former configuration of the conventional example (FIG. 7), it is necessary to insert the roller 7 into the roller ring 8 and attach the washer 11, which increases the number of man-hours and the number of parts. This resulted in an increase in costs. In addition, since the boss 9 has a cylindrical shape, even if the roller ring 8 is made of a low-loss dielectric material such as resin, the wall thickness of the hub 9 becomes thick, resulting in high frequency loss at the boss 9. If high-frequency radio waves are continued to be irradiated for a long time without putting a load (food) into the heating chamber, the roller 7 may become deformed.
There were times when the rotation stopped.

Next, the latter of the conventional examples as an improvement plan (Figure 8)
In the configuration, centrifugal force acts as the roller 7 rotates,
The roller 7 tries to come out from the roller ring 12.

On the other hand, if high-frequency radio waves are continued to be irradiated for a long time without putting a load (food) into the heating chamber, the thick part at the tip of the boss 13, which is divided into two parts, will begin to deform. At this time, the above-mentioned centrifugal force acts and is further accelerated, and eventually the roller 7 comes off and sometimes the turntable 4 stops.

The present invention solves these conventional problems, and aims to provide a roller mounting structure that requires fewer parts, fewer assembly steps, and is more durable.

Means for Solving the Problems In order to achieve the above object, the present invention provides a cylindrical boss portion with a pair of partially cut and raised pawls, and uses the elasticity of the pawls to attach and hold the roller. It is configured to do this.

Effects Due to the above configuration, the device of the present invention does not require a washer for fixing the roller, has fewer parts, and reduces the number of man-hours required to install the roller. Since there is no boss part, there is no deformation of the boss portion, and the roller does not come off, resulting in excellent durability.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIG. 2, bosses 22 are provided at three locations on the outer periphery of the roller ring 21. The boss 22 has a pair of partially cut and raised claws 2 on the cylindrical boss portion 22 for mounting.
There are 3. When the roller 7 is inserted into the boss 22, the cut-and-raised claw portion 23 is retracted due to its elasticity.
passes over the claw portion 23, and due to its elasticity, the claw portion 23 returns to its original position, preventing the roller 7 from being pulled out.

FIG. 3 shows a cross-sectional view of the high-frequency heating device according to the present invention. In FIG. 3, high-frequency electromagnetic waves from a high-frequency oscillator (magnetron) l pass through a waveguide 15, pass through a cover 2 made of a low-loss dielectric, and enter a heating chamber 3. A turntable 4 for rotating food (not shown) is provided at the bottom of the heating chamber 3. The turntable 4 is rotated by a motor 5 provided outside the heating chamber 3, and the motor 5 and the turntable 4 are coupled to each other by a pulley shaft 6 passing through a wall of the heating chamber. Under the turntable 4, there are a plurality of rollers 7 (3) to reduce the rotational torque.
When the turntable 4 rotates, the roller 7 also rotates in accordance with the rotation. In order for the roller 7 to rotate stably, the roller 7 is attached to the roller ring 21 so as to rotate. turntable 4
The turntable 4 has a circular shape, and the bottom of the turntable 4 is provided with a concave and convex portion that connects with the pulley shaft 6, making it easy to attach and detach.
It plays a role in improving usability.

Three rollers 7 are provided below the turntable 4 for smooth rotation of the turntable 4, and are rotatably attached to a roller ring 8.

FIG. 4 shows an external perspective view of the turntable 4, roller ring 21, roller 7, and pulley shaft 6.

FIG. 1 shows an enlarged view of the main parts of the roller ring 21 of the present invention.

FIG. 1a is an enlarged perspective view of the main part. Figure 1 is Figure 1a
FIG. 1C is a sectional view taken along line B-B in FIG. 1a. As shown in FIG. 1C, the cylindrical boss portion 22 on the outer periphery of the roller ring 21 is hollow, so that the uniformity of the wall thickness can be maintained, which is not only favorable for molding but also resistant to high frequency electromagnetic waves. There is no local heating or heat generation even when the cylinder is heated (it has good durability. Also, the hollow cylindrical boss portion 22 is provided with a pair of partially cut and raised claws 23. These claws have elasticity. The portion 23a that protrudes beyond the diameter of the boss is claw-shaped and serves as a hook.

Further, the seat 22a, which is larger in diameter than the boss portion 22, is provided to maintain rotational contact stability of the roller 7.

FIG. 5 shows an external perspective view of a general high-frequency heating device (microwave oven).

There is a heating chamber 3 inside the main body 24, and there is a door 25 pivotally supported on the front surface of the heating chamber 3 so as to be freely openable and closable. There is an operation panel 26 on the right side of the door 25, which includes a timer knob 27 for controlling the heating time and an operation button 28 for "opening the door". A magnetron 1 and the like are built in behind the operation panel 26.

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

(1) Since the assembly work is completed by simply fitting the roller into the roller ring, compared to Conventional Example 1, there are fewer assembly steps and fewer parts, and the roller can be manufactured at low cost and economically.

(2) Since the boss portions and claw portions to which the rollers are attached can also be formed to have a uniform thickness, they do not generate local heat even when operated without load, and are sufficiently durable.

(3) If the boss section to which the roller is attached is divided into two parts as in the past, if the roller is operated without load, centrifugal force will be applied to the roller and the thick part at the tip of the boss will deform, causing the roller to come off. However, in the present invention, the boss has a cylindrical shape and the claw part has a uniform thickness, so it will not be deformed by long-term high-frequency irradiation and the roller will not come off. It becomes a durable device.

[Brief explanation of drawings]

Fig. 1 is a perspective view, plan view, and cross-sectional view of the main parts of a high-frequency heating device that is an embodiment of the present invention, Fig. 2 is an exploded plan view of the roller and roller ring for driving the turntable, and Fig. 3 is A vertical cross-sectional view of the device, FIG. 4 is an exploded perspective view of the same essential parts,
Fig. 5 is an external perspective view of a general high-frequency heating device, Fig. 6 is a longitudinal sectional view of a general high-frequency heating device, Fig. 7 is an exploded plan view of a conventional roller ring and roller, and Fig. 8 is a conventional FIG. 3 is an exploded plan view of the roller and roller ring of FIG. 1... Magnetron, 2... Cover,
3... Heating chamber, 4... Turntable, 5... Motor, 6...7" U-
Shaft, 7.+++ roller, 8..Roller ring, 9..Boss, 10..Groove, 11.
... Washer, 12 ... Roller ring, 13 ... Boss, 15 ... Waveguide, 2
1...Roller ring, 22...Boss, 23...Cut-and-raised claw portion, 24...
・Main body, 25...Name of the door agent Patent attorney Toshio Nakao Number 2 Figure 7--Roller 4-m-Turn Q7, number 4 Figure 6-
7'-Lee wheel 87---Roller 21--1 roller ring, 3-11 addition! 2 Da-Oζ 4 A--Ichimori 2e) ---'Door open, R-Won Figure 6 Figure 7 Sn-7

Claims (1)

[Claims] A heating chamber in the main body, a turntable on which the object to be heated in the heating chamber is placed, a motor for rotating the turntable, a pulley shaft for transmitting rotation of the motor to the turntable, and the turntable and the heating chamber. a roller ring located between the bottom surfaces and having a roller attached thereto for supporting the turntable, the roller of the roller ring being attached to a cylindrical boss part provided on the roller ring, and A high frequency heating device provided with a pair of partially cut and raised claws.