JPS5922136B2 - high frequency heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device for a high frequency heater equipped with a door lock mechanism.

Generally, high-frequency heaters are provided with an interlock mechanism to stop high-frequency output when the door of the high-frequency heater is opened.

This interlock mechanism mainly consists of a switch for stopping the output and a door key provided on the door to operate the switch.

Therefore, when the door is closed, it is locked with the door key.

Generally, the door of a high-frequency heater has the property that if a certain amount of force is applied to it, it will bend or become distorted depending on the material or structure.

Therefore, for example, if the door is closed and you try to open it without operating the door key properly, the door will be deformed by the opening force, and in this state the door key will not be completely released from the switch. Therefore, high frequency power continues to be radiated.

As a result, a gap is created between the deformed door and the open.
There is a risk of radio wave leakage occurring larger than this gap.

Such a situation also occurs in the following cases.

In other words, if a dish towel or the like gets caught between the door and the oven when the door is closed, or if food or dirt has accumulated during long periods of use, etc. By closing the door a little forcefully, the door key activates the above switch even though the door is slightly deformed and there is a gap between the door and the open position, and as a result, in this state, this high-frequency heating When the device is operated, the user is exposed to large leakage radio waves caused by the deformation of the door.

That is, the conventional structure is as shown in FIG. 1, where 1 is a door provided at the opening of the heating chamber so that it can be opened and closed, 2 is a door bundle, 3 is a door key, 4 is an oven front plate, and 6 is a door arm 6 that is pulled. The spring 7 is a roller that guides the door arm 6.

According to the above structure, when the door 1 is opened, the door 1 is always pressed against the oven front plate 4.

That is, the door arm 6 is formed in the shape as shown in FIG. It has a structure that attracts people to it.

Therefore, under normal usage conditions, the gap between the door 1 and the oven front plate 4 is almost the same as when the high-frequency heater was manufactured, and radio wave leakage did not become particularly large.

However, it is extremely rare for general users to always use the dish correctly, and under normal usage conditions, for example, when the high-frequency heater is in use, when closing door 1, a dish towel, which is common in every household kitchen, is used. In fact, cases where it gets stuck between the front plate 4 and the front plate 4 are commonplace.

In addition, things that get caught are not limited to dish towels, for example, chopsticks and toothpicks, and even if the user does not take good care of them, boiled food and dirt accumulate, and the door 1 is closed. Sometimes, the gap between the door 1 and the oven front plate 4 becomes abnormally large.

Therefore, in order to prevent such a dangerous situation, the present invention detects the increase in the gap between the door 1 and the oven front plate 4, and stops the oscillation of high-frequency output when the gap exceeds a certain limit. An embodiment of the present invention will be described below.

Note that the same parts as in FIG. 1 will be explained using the same reference numerals.

In FIG. 2, reference numeral 3 denotes a bundle piece, and when this is pressed, the door key 3 rotates upward and the door 1 can be opened.

9 is a latch switch operated by door key 3, 1
0 is a safety switch, 11 is an elastic movable piece, 12 is a door hook, and 13 is a foreign object such as a dish towel.

FIG. 3 shows a state in which a foreign object 13 is caught between the door 1 and the oven front plate 4, and the foreign object 13 has some degree of elasticity, although it varies depending on the material.

Furthermore, since the door 1 also has elasticity, although there are some differences depending on its material and structure, this foreign object 13 and the door 1
Due to the elasticity of the two swords, the door key 3 slides on the upper surface of the door hook 12 and is pushed upward, and when it reaches the normal closing position, the door key 3 is lowered to the position shown in FIG. 3 and is excessively closed.

However, when the -tan closes and the closing force disappears, this time,
Since a return force is exerted by the foreign object 13 and the elasticity of the double-edged blades of the door 1, a force in the direction of arrow F is applied to the door key 3.

This force F is applied to the movable piece 11, and the elastic movable piece 1
1 is bent, the safety switch 10 is activated, and by connecting the safety switch 10 in the position shown in FIG. 4, that is, in series with the relay coil 14, it is possible to turn off the power to the secondary circuit that generates high voltage. As a result, the high frequency output can be stopped and the safety of the user can be ensured.

Furthermore, although the movable piece 11 is provided in FIGS. 2 and 3 of this embodiment, it is clear that the same effect can be obtained even if this movable piece 11 is omitted in order to simplify the configuration. be.

In addition, in FIG. 3, the explanation has focused on the case where the foreign object 13 is caught, but for example, when the door bundle 2 is pulled in the opening direction without operating the bundle piece 8 in FIG. This is a natural thing to consider under the conditions of use.

However, even in such a case, the above-mentioned foreign object 13
In exactly the same way as when it is sandwiched between the oven front plate 4 and the
Since the safety switch 10 works, the safety of the user can be guaranteed.

Note that the latch switch 9 and safety switch 10 are attached to a switch mounting body 15.

Further, in the above embodiment, the safety switch 10 is used to detect the force F.
However, since it is sufficient to detect the displacement of the movable piece 11, for example, a pressure sensitive element may also be used.

Note that when a pressure sensitive element is used, dangerous leakage radio waves can be further reduced.

That is, when the safety switch 10 is used, it is necessary to move the movable piece 11 to some extent until the safety switch 10 is activated, and therefore, a gap is inevitably created between the door 1 and the oven front plate 4 until the high frequency output is stopped. It turns out.

In contrast, in the case of a pressure sensitive element, if the high frequency output is stopped when a force exceeding a certain predetermined force is applied, it is possible to prevent the door key i3 and the movable piece 11 from closing when the door 1 is closed.
Therefore, compared to the installation of the safety switch 10, the high frequency output can be stopped at a position where the gap between the door 1 and the oven front plate 4 is extremely small, making it safer. It becomes a high frequency heater.

Further, some high-frequency heaters are equipped with a plurality of door keys 3, and if each of the plurality of door keys 3 is provided with the device according to the present invention, the safety of the user will be further increased. Needless to say.

Further, the door key 3 shown in FIGS. 2 and 3 is provided on the door 1, but since all that is required is a function to lock the door 1, the door key 3 is provided on the main body side of the high-frequency heater. There is no problem even if you do.

As explained above, according to the present invention, with a simple configuration,
Safety can be ensured not only during normal use, but also during abnormal use when a foreign object such as a dish towel is sandwiched between the door and the open front plate, and because the structure is simple, it can be provided at low cost.

In addition, when attaching a latch switch, movable piece, and safety switch to a switch mounting body that forms a door hook, they can be made into a unit, so the delicate positional relationships of each part can be adjusted at the stage of making the unit, making processing and assembly extremely easy. It is possible to provide a high-frequency heater that is not only safe but also highly safe.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway top view of a conventional high-frequency heater, Fig. 2 is a sectional view of essential parts of a high-frequency heater according to an embodiment of the present invention, and Fig. 3 shows the same abnormal usage state. The sectional view shown in FIG. 4 is a circuit diagram of the heater. 1...Door, 3...Door key, 4...
... Oven front plate, 10 ... Safety switch, 11 ... Movable piece, 13 ... Foreign object, 1
5...Switch mounting body.

Claims (1)

[Claims] 1 A main body with a heating chamber inside, a door pivotally attached to the main body to open and close the opening of the heating chamber, a locking mechanism provided on the door to lock the door to the main body, and a locking mechanism disposed within the main body to lock the door to the main body. , a first switch that operates in conjunction with the locking mechanism to control opening and closing of the power supply circuit of the high-frequency oscillator, and a first switch that is provided on the main body corresponding to the locking mechanism and that operates in conjunction with the operation of the door in the opening direction. a second switch that is activated to open the power circuit of the high frequency oscillator; the first switch and the second switch are mounted on the same switch mounting body;
A high-frequency heater characterized in that a part of the mounting body is integrally formed with a locking part that engages with a locking mechanism provided on the door when the door is closed.