JPS5843699Y2 - 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 ways to drive 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 heated object mounting table is attached to this rotary shaft, and a motor is installed at the outside bottom of the heating chamber. There is a method in which a connected rotating body and a heated object rotation mounting table are provided corresponding to the bottom surface of the heating chamber, and the rotational force is transmitted by the magnetic coupling force of the magnets attached to the rotating body and the heated object rotation mounting table.

At this time, it is very troublesome for the user to clean the heating chamber 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 rotating shaft seal on the bottom of the heating chamber, which will have a negative impact on the motor charging parts installed at the outside bottom of the heating chamber, causing electrical leakage. This is highly unreliable.

However, the latter has none of the above-mentioned drawbacks, is easy to clean, and has a very reliable structure 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 the large rotations that can be made, the support structure of the rotating mounting table must be made of rolling friction, and the resistance generated during rotation must be minimized. This was extremely restrictive as it required the use of materials with high heat resistance and low loss due to local frequencies.

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 capable of providing a structure that is not restricted by usage conditions, exhibits stable performance using inexpensive materials, and is easy to use.One 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 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.
As shown in the figure, a motor 4 for driving a rotating mounting table 3 is provided at the outer bottom of the heating chamber 1, and a rotating shaft 5 of the motor 4 is provided at the bottom of the heating chamber.
A hole 6 is provided for inserting the device into the heating chamber, and a gear 7 for transmitting a driving force to the rotary mounting table 3 is provided on the shaft inside the heating chamber.

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 damage such as electrical leakage and motor rotation failure.

In addition, the ease of cleaning, which is a major advantage 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. .

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

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, since the frictional resistance due to the load must be reduced, the rotation of the roller is changed from sliding friction to rolling friction, thereby greatly reducing the frictional resistance during rotation.

However, in this structure, since the roller 8 must be rotated and also revolved, a roller position regulating member 17 is required that always 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 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, 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 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: the inability to brown bread and bread and cutlets.

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, in the case of the above-described configuration, the heater 1 is installed as shown in Fig. 5 so that the resin material is less likely to receive the heat of the heater.
9 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 receive the heat of the heater 19 directly.

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 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 out and put in, making it inconvenient to use.Additionally, the addition of the heat shield plate 20 increases the number of parts. Users are forced to bear the burden of increased costs.

Therefore, in the present invention, the roller position regulating member 17 and roller 8 are installed as shown in Fig. 7 with 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 provided inside the rotary mounting table rather than the magnet 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 is greatly improved compared to the case where resin parts are used in the rotary mounting table support structure, and even when the heater is attached, the heat resistance is completely improved. There will be no problems.

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 contact or be close to other metal parts, so there is no concentration of electric fields such as sparks, and the roller position regulating member 17 is made of metal when heating the heater. It also has a configuration with a high degree of freedom in design, with no need to worry about heat resistance at all.

However, since the porcelain roller 8 is constantly rotating during high-frequency heating, the frictional resistance of porcelain becomes extremely large, and when a load is placed on the rotating mounting table, the frictional resistance is more extreme than the magnetic coupling force. As the size of the rotary mounting table increased, there were permanent installations where the rotating mounting table did not rotate or did not rotate smoothly.

In order to eliminate this problem, when using alumina material, which has a very high hardness among the types of porcelain and has been polished by precision molding with a very fine composition, the frictional resistance caused by the rotation of the roller is used. has become very small, but because the alumina used for the rollers is too hard, a secondary customer problem has arisen: the contact surface of the metal roller position regulating member 17 to which the rollers are attached is worn out.

Although some wear does not pose any particular problem in terms of performance during use, an abnormal noise is generated when the metal and porcelain slide, which significantly reduces the marketability and is unpleasant for the user.

In addition, if this is used continuously, the frictional resistance, which was initially very small, will cause the roller contact surface of the roller position regulating member 17 to become rough and impede the rotation of the roller, resulting in malfunction of the rotating mounting table. It is something that is connected.

Therefore, in the present invention, the roller is made of porcelain and the roller position regulating member is made of metal, and as shown in FIG. It is characterized by being attached to the position regulating member. With this configuration, the metal and porcelain do not slide directly as mentioned above, which prevents the generation of abnormal noise and reduces frictional resistance to a very low level. It becomes easier.

Also, it goes without saying that the resin spacer should be made of a material with high heat resistance and wear resistance.

With this configuration, it is possible to provide the user with an easy-to-use, high-performance rotary mounting table structure that is extremely easy to clean in a high-frequency heating device with a heater.

The next method is to attach the roller position regulating member 17 to the metal shaft 20 provided at the center of the rotary mounting table 11 via the insulator 21. However, since the roller position regulating member 17 must rotate, the insulator 21 They are fitted with a certain amount of clearance.

At this time, when the roller position regulating member 17 is fixed with the metal shaft 20 as shown in FIG. 8, it is impossible to remove it.
When the product is delivered to the customer, the serviceability is very poor and the entire rotary mounting table has to be replaced, which is very inconvenient for the user.

Therefore, in order to easily remove only the roller position regulating member 17, a structure is adopted in which it is fixed to the shaft 25 using an elastic retaining ring as shown in FIG. 9, 24.

This structure eliminates inconvenience during service and provides the user with a high-frequency heating device with a heater that is extremely easy to use and has high performance.

[Brief explanation of the drawing]

Fig. 1 is a front view of a high-frequency heating device with a heater equipped with a rotary mounting table, and Fig. 2 is a sectional view of the rotary mounting table drive part of Fig. 1.
Figure 3 is a front view of a high-frequency heating device with a heater equipped with a rotary mounting table that uses magnetic coupling force to transmit driving force, Figure 4 is a cross-sectional view of the rotary mounting table drive part of Figure 3, and Figure 5 is a A cross-sectional view when the lower heater is attached to the high-frequency heating device shown in Figure 4,
Fig. 6 is an external view of the lower heater unit of the same main part, Fig. 7 is a sectional view when the roller is provided inside the magnet, Fig. 8 is a sectional view when the roller position regulating member is made of metal, FIG. 9 is an enlarged sectional view of essential parts showing an embodiment of the present invention. 8...roller, 11...rotating mounting table,
17... Roller position regulating member, 21...
...Insulator, 22.23...Resin spacer.

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 placement table, and a food placement table supporting roller is provided inside the plurality of driving magnets provided on the food placement table to regulate the roller position. A high-frequency heating device with a heater, characterized in that the member is made of metal and the roller is made of porcelain, wherein the roller is attached to the roller position regulating member via a resin spacer. (2) Practical use characterized in that a metal shaft is provided at the center of the food placing table, and the roller position regulating member is fixed to the rotary placing table with an elastic retaining ring through an insulator so as to be rotatable. A high-frequency heating device with a heater according to claim 1 of the patent registration claim.