JPS596329Y2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotating mounting table for heated objects in a high-frequency heating device.

Conventionally, in order to heat the heated object more uniformly when heating the heated object using high frequency waves, a rotating mounting table for the heated object has been provided.

This is because the high frequency waves irradiated into the heating chamber are not uniform, and there are areas where the high frequency is strong and weak, resulting in uneven heating of the heated object.By rotating the heated object, the heated object can be relatively evenly heated. The idea is to irradiate high frequency waves.

There are two driving methods for this heated object rotation mounting table: a motor is used as the power source, a rotating shaft is exposed at the bottom of the heating chamber, and the heated object mounting table is attached to this rotating shaft, and the other is connected to the motor at the bottom of the heating chamber. There is a method in which a rotary body and a rotary mounting table for the heated object are provided corresponding to the bottom surface of the heating chamber, and the rotational force is transmitted by the magnetic coupling force between the rotary body and the magnets attached to the rotary mounting table for the heated object.

At this time, the former user, when cleaning the heating chamber,
Since the rotating shaft, rollers for supporting the rotating mounting table, etc. are exposed at the bottom of the heating chamber, unnecessary protrusions appear, which is very troublesome.

Also, in terms of safety, if moisture is spilled inside the heating chamber, the moisture may drip outside the heating chamber at the rotating shaft seal, which may adversely affect the motor charging section installed at the bottom of the outside of the heating chamber, causing electrical leakage. It was also extremely unreliable.

However, the latter does not have any of the drawbacks mentioned above, is easy to clean, and is of very reliable construction without any danger.

However, when magnetic coupling force is used for power transmission, there is a limit to the attractive force of the magnet, and there are various design constraints.

In other words, in order to reduce the force required for rotation, the support structure of the rotating mounting table must be made of rolling friction to minimize the resistance generated during rotation, and the supporting structure of the rotating mounting table is made of resin with a very low coefficient of friction. In addition to having to use materials, it was also necessary to use materials with high heat resistance and low loss due to high frequencies, which was very restrictive and required the use of expensive materials with poor moldability.

In addition, recently some devices are equipped with heaters for the purpose of browning the heated object, and the thermal conditions are extremely severe. However, when using magnetic coupling force for power transmission, which is naturally easy to use and highly safe, Conditions of use were restricted.

Therefore, the present invention is capable of providing a structure that is not restricted by usage conditions, exhibits stable performance using low-cost materials, and is easy to use.Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a high-frequency heating device equipped with a heater equipped with a rotary mounting table for heated objects. Heaters 2 are mounted above and below inside the heating chamber 1, and the rotary mounting table structure is similar to that of the second rotary mounting table.
Shown in the figure.

A motor 4 for driving the rotary mounting table 3 is provided at the outer bottom of the heating chamber 1, a hole 6 is provided at the bottom of the heating chamber for inserting the rotary shaft 5 of the motor into the heating chamber, and a shaft portion inside the heating chamber is provided with a motor 4 for driving the rotary mounting table 3. It is rotated by a gear 7 that transmits driving force.

At this time, since the rotating mounting table is unstable when the object to be heated is placed on it only by the gear 7, a supporting roller 8 is provided via a mounting fitting 9.

In this type of method, the object to be heated is coffee, milk,
In the case of liquids such as alcoholic beverages, if they are accidentally spilled during heating or when the user is putting them in and taking them out, they may accumulate at the bottom of the heating chamber and cause the motor to charge even though the sealing material 10 is present through the opening 6 of the motor rotating shaft 5. The user is exposed to dangers such as electrical leakage due to moisture dripping into the parts.

Moreover, the ease of cleaning, which is a major advantage of the high-frequency heating device, is greatly impaired because the roller 8, mounting bracket 9, motor rotating shaft 5, gear 7, etc. protrude from the bottom of the heating chamber.

However, on the other hand, some devices are equipped with a driving force transmission structure using magnetic coupling force in order to maintain the advantages of high-frequency heating devices and to provide a rotating mounting table to reduce uneven heating of the object to be heated.

Figure 3 is a front view of the same, and the driving force transmission structure is the fourth one.
As shown in the figure, a magnet 12 is installed on a rotary mounting table 11 installed at the bottom of the heating chamber, and correspondingly, a magnet 12 is also installed at the outside bottom of the heating chamber.
2 is provided.

This rotating body 13 is rotated by the rotational force of a motor via a rubber belt 14 around a shaft 15 provided on the outside bottom of the heating chamber, and the magnets provided on the rotating body 13 are moved between the magnets provided on the rotating mounting table 11. The rotary mounting table 11 rotates while being attracted by the rotating body 13 due to the suction force.

However, the attractive force between magnets is limited by the distance between the magnets and the magnetic flux density of the magnets themselves, and the design is extremely restricted. When a load is applied to the rotating mounting table support roller 8,
If the frictional resistance rapidly increases and becomes larger than the magnetic coupling force, only the rotating body 13 will idle and the rotating mounting table 11 will stop.

Therefore, it is necessary to reduce the frictional resistance due to the load, and by changing the rotation of the roller from sliding friction to rolling friction, the frictional resistance during rotation is greatly reduced.

However, in this structure, since the roller 8 must be rotated and also revolved, a roller position regulating member 17 is required that holds the roller at a constant pitch and is rotatable, that is, determines the orbit of the revolution of the roller.

At this time, since the heating chamber 1, the rotary mounting table 11, and the cover 18 for housing the magnet are made of metal bodies, each metal body is designed to maintain an appropriate gap.

In other words, if metal bodies are brought into contact with each other or the gap is too small when high frequency waves are irradiated, the high frequency electric field will concentrate and there is a risk of sparks or the like.

Therefore, conventionally, the roller position regulating member 17 and the roller 8 are made of a resin material to maintain an appropriate gap between the metal bodies.

At this time, the roller position regulating member 17 and the roller 8 are exposed to high frequency waves in the heating chamber, so they are required to have low high frequency loss and high heat resistance.

In other words, some resin materials absorb radio waves easily while others do not. When absorbing radio waves, the material itself generates heat, and when the temperature exceeds the heat resistance temperature of the material, it deforms and melts.

The types of materials that have low high-frequency loss and high temperature resistance as described above are limited in variety and are very expensive, making selection and design of materials very difficult.

However, recently, some devices are equipped with heaters to compensate for one of the drawbacks of high-frequency heating, which is the inability to brown bread and cookies.

When this is combined with a rotating mounting table that obtains driving force through magnetic coupling as shown in Figure 5, the temperature of the resin material mentioned above becomes extremely high (approximately 250 to 300 degrees Celsius), and in addition to the heat generated by the high frequency, there is a thermal effect from the heater. As a result, resin materials became unusable.

Therefore, in the case of the above structure, the heater 19 is installed above the rotating mounting table 11 as shown in FIG. 6 so that the resin material is not easily exposed to the heat of the heater 19, and the heat of the heater 19 is directly transferred to the rotating mounting table. Heat shield plate 20 is installed so that the stand mechanism is not affected.
I am trying to set it up.

With this method, the resin material of the rotary mounting table mechanism is hardly affected by the heat of the heater and can provide stable performance.

However, this method has the disadvantage that, as shown in FIG. 7, a heater unit consisting of a heater 19 and a heat shield plate 20 must be inserted into the oven during cooking, and the heater unit must be removed during high-frequency heating.

In other words, even though the mechanism was designed to be easy to use, it is not easy to use because the heater unit must be taken out and put in when a heater is installed, and the number of parts increases due to the addition of the heat shield plate 20. The cost is forced to increase, and the user bears a considerable burden.

Therefore, in the present invention, the roller position regulating member 17 and the roller 8 are connected to magnets as shown in Fig. 8 in a structure that makes maximum use of the conventional advantages of ease of use and eliminates the above-mentioned disadvantages even when the heater is installed. The heater 19 is installed inward of the four-transfer mounting table than 12, and the rotating mounting table is reduced by the space of the roller outside the conventional magnet, and the heater 19 is placed on the outer periphery of the rotating mounting table. The resin parts are spaced apart to create a structure that is less susceptible to the effects of heat from the heater.

With this arrangement, it can be used as a conventional, easy-to-use high-frequency heating device, and even when the heater is installed, the temperature of the roller 8 and roller position regulating member 17 is approximately 240°C or less, as shown in Figure 10. In addition, the structure does not require a heat shield or the like, and the conventional work of attaching and detaching the heater unit during oven cooking and high-frequency heating can be eliminated, providing a very user-friendly structure.

Further, by providing the roller 8 inside the magnet 12, the roller position regulating member 17 can easily be made of metal as shown in FIG.

In other words, by installing the metal shaft 20 at the center of the rotating mounting table 11, arranging the metal roller position regulating member 17 via the insulator 21, and attaching the roller 8, the centers of revolution of the magnet and the roller can be perfectly aligned. Therefore, it is possible to always obtain smooth rotation even when an uneven load is applied, and there is no need to worry about the heat of the roller position regulating member 17, so it is very easy to design, and it is made by metal press processing. It is made of a much cheaper material that can be mass-produced than resin materials with poor moldability, and can always exhibit extremely stable performance.

As described above, in the present invention, the structure of the rotary mounting table, which has conventionally been a means of uniformly heating objects to be heated, has been improved so that even when the heater is attached, it is easier to clean than conventional methods, and there is no need to attach or detach the heater unit. It is possible to provide an easy-to-use structure at a lower cost.

[Brief explanation of the drawing]

Figure 1 is a front view of the high-frequency heating device with a heater equipped with a rotary mounting table with the door open, Figure 2 is a sectional view of the drive section of the rotary mounting base in Figure 1, and Figure 3 shows the magnetic coupling as the driving force. A front view of a high-frequency heating device equipped with a heater equipped with a rotary mounting table used for transmission, Fig. 4 is a sectional view of the drive section of the rotary mounting table in Fig. 3, and Fig. 5 is a diagram showing the outer periphery of the conventional rotary mounting table. Fig. 6 is a sectional view showing an example in which a heater is installed.
The figure is an external view of the same heater unit, Figure 8 is an enlarged sectional view of the main parts showing one embodiment of the present invention, Figure 9 is a sectional view of an embodiment using a metal roller position regulating member, and Figure 10 The figure is a temperature rise characteristic diagram of the roller and the roller position regulating member. FIG. 3 is a cross-sectional view of an embodiment using a roller position regulating member made of a metal body. 1... Heating chamber, 2... Heater, 3,
11,... Rotating mounting table, 4... Drive motor, 8... Roller, 12...
Magnet, 13...Rotating body, 17...Roller position regulating member.

Claims (2)

[Scope of utility model registration request] (1) A food mounting table rotatably installed on the bottom of the heating chamber, a rotating body connected to a motor via a deceleration means for rotationally driving the food mounting table, and a plurality of driving magnets provided on the rotating body. and a means for magnetically coupling to the magnet provided on the food mounting table, and a food mounting table supporting roller is provided inside a plurality of driving magnets provided on the food mounting table, and the food mounting table A high-frequency heating device characterized by a heater placed around the outer circumference of the device. (2) The roller is rotatably attached to a metal body, and the metal body is rotatably attached via an insulator to a metal shaft provided at the center of rotation of the food table. A high-frequency heating device according to claim 1 of the utility model registration claim.