JPS5843698Y2 - High frequency heating device with heater - 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 an attempt to irradiate the object to be heated with high frequency waves relatively evenly by rotating the object to correct the unevenness of the high frequency waves irradiated into the heating chamber.

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

At this time, it is very troublesome for the user to clean the heating chamber in the former case because the rotating shaft, rollers for supporting the rotating mounting table, etc. are directly exposed at the bottom of the heating chamber.

Also, in terms of safety, if moisture is spilled inside the heating chamber, the moisture will drip outside the heating chamber at the 5-rotation shaft seal on the bottom of the heating chamber, adversely affecting the motor charging parts etc. provided at the outside bottom of the heating chamber and causing electrical leakage. This is highly unreliable.

However, the latter does not have any of the above drawbacks and is a very reliable structure that is easy to clean and completely non-hazardous.

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 as much as possible, the support structure of the rotating mounting table must have rolling friction to minimize the resistance generated during rotation, and the supporting structure of the rotating mounting table has a very low coefficient of friction. The resin material had to be made of a highly heat-resistant material with little loss due to local frequency, which was very limiting.

However, recently, some models have been equipped with heaters, making the thermal conditions extremely severe, while the usage conditions have been limited when using magnetic coupling force, which is naturally easy to use and highly safe, for power transmission.

Therefore, the present invention is not limited by usage conditions, can exhibit stable performance using inexpensive materials, and can provide an easy-to-use structure.An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a high-frequency heating device with a heater equipped with a rotating table for heating objects. Heaters 2 are installed above and below inside the heating chamber 1, and the structure of the rotating table is shown in FIG. As 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, and a hole 6 is provided at the bottom of the heating chamber for inserting the rotating shaft 5 of the motor 4 into the heating chamber. A gear 7 for transmitting driving force to the rotary mounting table 3 is provided.

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 system, if the object to be heated is a liquid such as coffee, milk, or alcohol, if the object is inadvertently spilled during heating or when the user is putting it in and taking it out, it will accumulate at the bottom of the heating chamber and cause the opening of the motor rotation shaft 5. Despite the presence of the sealing material 10 from the section 6, there is a high possibility that moisture will drip onto the motor rotation bearing section and the charging section, causing problems such as electrical leakage and motor rotation failure.

In addition, the ease of cleaning, which is one of the major merits of high-frequency heating equipment, is greatly impaired because the rollers 8, mounting brackets 9, motor rotating shaft 5, gears 7, etc. protrude from the bottom of the heating chamber. ing.

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

FIG. 3 is a front view of the same, and as shown in FIG. 4, the driving force transmission structure is as shown in FIG.
A rotating body 13 is provided, and this rotating body 13 is rotated by the rotational force of a motor via a rubber belt 14 around a shaft 15 provided at the outside bottom of the heating chamber. The rotary mounting table 11 rotates while being attracted to the rotary body 13 due to the attraction force between the magnets provided on the mounting table 11.

However, the attractive force between the magnets is limited by the distance between the two magnets and the magnetic force of the magnets themselves, and the design is extremely restricted. At this time, when a load is applied to the roller 8 and the frictional resistance rapidly increases and becomes larger than the magnetic coupling force, only the rotating body 13 rotates idly and the rotating mounting table 11 stops.

Therefore, it is necessary to reduce the frictional resistance due to the load, so 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 on its own axis and also revolved, a roller position regulating member 17 is required that always maintains 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 19, the rotary mounting table 11, and the shishak cover 18 that houses the magnet are made of metal bodies, each metal body is designed to maintain an appropriate gap.

In other words, if metal objects come into contact with each other when irradiated with high-frequency waves, or the gap is too small, the high-frequency electric field will concentrate.
This is because there is a danger of sparks, etc.

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, since the roller position regulating member 17 and the roller 8 are exposed to high frequency waves in the heating chamber, 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 material's heat resistance temperature, 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 have been equipped with heaters to compensate for one of the drawbacks of high-frequency heating, which is the inability to brown bread and bread.

When this is combined with a rotating mounting table that transmits the driving force through magnetic coupling, 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, the resin material is greatly affected by the heat of the heater. It fell into an unusable state.

Therefore, when the above configuration is adopted, the heater 19 is installed as shown in FIG.
is provided above the rotating mounting table 11, and a heat shield plate 20 is provided so that the rotating mounting table mechanism does not directly receive the heat of the heater 19.

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. 6, 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 for ease of use, when a heater is installed, the heater unit has to be taken in and out, making it inconvenient to use.Additionally, the addition of the heat shield plate 20 increases the number of parts. 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 attached to magnets as shown in Fig. 7, so that the above-mentioned inconveniences can be eliminated even when the heater is attached, by making the most of the conventional advantages of ease of use. The heater 19 is provided on the inner side of the rotary mounting table than the rotary mounting table 12, and the rotary mounting table is reduced by the space of the roller outside the conventional magnet, and the heater 19 is arranged on the outer periphery of the rotary mounting table.

At this time, if the roller position regulating member 17 is made of metal and the roller 8 is made of porcelain, the heat resistance will be greatly improved compared to the case where resin parts are used in the rotary mounting table support structure, and the heat resistance will be improved even when the heater is attached. There will be no problems at all.

FIG. 8 shows its configuration, and the rotary mounting table 1
A metal shaft 20 is provided at the center of the roller 1, and a metal roller position regulating member 17 and a ceramic roller 8 are attached via an insulator 21.

With this configuration, even if the roller position regulating member 17 is made of metal, it does not come into contact with or come close to other metal parts, so concentration of electric fields such as sparks does not occur, and the insulator 21 also If the heater 19 is made of porcelain or the like, the thermal influence of the heater can be completely ignored even if the heater 19 is installed near the rotary mounting table 11 as shown in FIG.

In addition, since the porcelain roller 8 and insulator 21 are constantly rotating during high-frequency heating, it is often thought that porcelain will have a very high frictional resistance, but among the types of porcelain, alumina etc. have a very high composition. It is easy to form finely and precisely, and by polishing it during secondary processing, the surface is extremely smooth and it is easy to reduce the coefficient of friction to a very low level.
Moreover, it has excellent moldability compared to heat-resistant resins, so it has the advantage of being able to be produced at a low cost.

With this configuration, there is no inconvenience in attaching or detaching the heater unit that would limit the user to special usage methods when combined with a rotary mounting table that transmits driving force by magnetic coupling to the high-frequency heating device with heater. It has a very user-friendly configuration that allows easy switching between heater heating and high-frequency heating, and is also easy to clean compared to conventional high-frequency heating devices.

For the user, it is very troublesome to clean the inside of the heating chamber, especially after using the heater, but the structure of this invention has fewer parts and there are no unnecessary protrusions inside the heating chamber, making cleaning very easy. It is possible to provide a good structure at a low cost.

[Brief explanation of drawings]

Figure 1 is a front view of a high-frequency heating device with heater equipped with a rotary mounting table, Figure 2 is a cross-sectional view of the rotary mounting table drive part of Figure 1, and Figure 3 is a diagram showing a device using magnetic coupling force to transmit driving force. A front view of a high-frequency heating device with a heater equipped with a rotary mounting table, Fig. 4 is a sectional view of the rotary mounting table drive part of Fig. 3, and Fig. 5 is a case where the lower heater is attached to the high-frequency heating device of Fig. 4. 6 is an external view of the main lower heater unit, FIG. 7 is a sectional view when the roller of the present invention is installed inside the magnet, and FIG. 8 is an embodiment of the present invention. FIG. 8... Roller, 11... Rotating mounting table, 17... Roller position regulating member, 19...
...Heater, 21...Insulator.

Claims (2)

[Scope of utility model registration request] (1) A food mounting table rotatably placed 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 drive units provided on the rotating body. A food placing table supporting roller is provided inside a plurality of driving magnets provided on the food placing table, and includes a magnet and a means for magnetically coupling to the magnet provided on the food placing table, and the roller position is A high-frequency heating device with a heater, characterized in that the regulating member is made of metal, and the roller is made of porcelain. (2) High-frequency heating with a heater according to claim 1 of the utility model registration claim, characterized in that a metal shaft is provided at the center of the food table and the roller position regulating member is attached via an insulator. Device.