JPS5941596Y2 - microwave oven - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a microwave oven equipped with a rotary table.

Conventionally, in a microwave oven, the object to be heated, which is a cooking material, is rotated in a heating chamber to uniformly irradiate high-frequency energy to the object to heat the object evenly. a rotating table on which objects are placed;
The drive shaft rotated by the motor is removably connected to the drive shaft by a concave-convex engagement relationship.

Therefore, it is necessary to provide the drive shaft and rotary table with recesses or protrusions that engage with each other, and not only is it time-consuming to manufacture them, but the recesses formed tend to accumulate dust, oil, etc. Oil stains and the like harden when heated, making cleaning them extremely troublesome.

In addition, since the rotary table can be supported by a concave and convex engagement relationship, it is possible to drive heat-resistant containers such as ordinary plates without using the rotary table, especially if the drive shaft side is convex. It is impossible to set the rotary table directly on the shaft, and if the rotary table is damaged, cooking will be disrupted.

Furthermore, when the rotary table is removed from the drive shaft and used as a tray, the recessed or convex portions spoil the appearance, and this is particularly noticeable when the rotary table is molded from transparent glass.

The present invention was devised to solve the above-mentioned problems with the conventional configuration, and its purpose is to interpose a member with a large friction coefficient between the compling ring rotated by the drive shaft and the rotary table, thereby reducing the unevenness of the uneven surface. To provide a microwave oven that can reliably transmit the rotational force of a drive shaft to a rotary table only by frictional contact without any engagement relationship.

Hereinafter, one embodiment embodying the present invention will be explained with reference to FIGS. 1 and 2. In the drawings, 1 is a heating chamber fixedly installed in the case 2, and the front side is open and the open part is opened. A door body 3 is supported on one side so as to be openable and closable.

Reference numeral 4 denotes a coupling rotatably supported via a bearing member 7 in a mounting hole 6 formed transparently in the bottom plate portion 5 of the heating chamber 1, and is made of synthetic resin with low high frequency loss.

Reference numeral 8 denotes a mounting portion formed in a portion of the coupling 4 that protrudes upward from the bearing member 7 so as to have an expanding diameter in an umbrella shape. A fitting recess 9 is formed.

Reference numeral 10 denotes a disk-shaped mounting member with a flat upper surface, which is fixed to the upper surface of the mounting portion 8 of the coupling 4 by fitting an annular fitting protrusion 11 formed on the lower surface into the fitting recess 9. In this embodiment, silicone rubber is used.

Note that the bearing member 7 receives high frequency energy from the heating chamber 1.
In order to prevent leakage to the outside, the length is one quarter of the wavelength of the high frequency used, and this constitutes a choke.

Reference numeral 12 denotes a motor fixedly attached to a mounting plate 13 fixed to the lower surface of the bottom plate portion 5, and a drive shaft 15 protruding upward via a reduction gear mechanism 14 penetrates through the axial center of the coupling 4. It is inserted and locked into the locking hole 16.

Reference numeral 17 designates an appropriate number (three in this embodiment) of support rollers arranged on the upper surface of the bottom plate portion 5 at equal intervals on a circumference concentric with the coupling ring 4.

Reference numeral 18 denotes a rotary table formed into a tray shape made of heat-resistant glass with low high frequency loss and which can also be used as a tableware for placing objects to be heated. They are placed so that they are in strong contact with each other, and the peripheral edge of the lower surface is rotatably supported by the support roller 17.

The central portion of the lower surface of the rotary table 18 and the upper surface of the mounting member 10 are mirror-finished so that they come into close contact with each other and increase the contact friction force.

Therefore, even if the rotary table 18 and the coupling 4 are not connected in an uneven engagement relationship, if the motor 12 is started and high frequency energy is irradiated, the rotary table 1
8 is a mounting member 10 depending on its own weight and the weight of the object to be heated.
It is stably rotated integrally with the coupling 4 only by frictional contact with the coupling 4, and the object to be heated placed on the upper surface of the coupling 4 is evenly heated.

Reference numeral 20 denotes an annular support protrusion formed concentrically on the peripheral edge of the lower surface of the rotary table 18, which prevents the rotation of the rotary table 18 when it is placed as tableware on any flat surface such as a dining table or a cooking table. The rotary table 18 is coupled to the rotary table 18 by couplings 4 that function to reliably support the table 18 and are positioned correspondingly to the inside of the support rollers 17.
If the rotary table 18 and the coupling 4 are placed in the same position, the centers of the rotary table 18 and the coupling 4 will substantially coincide, and the rotary table 18 will also function as a positioning protrusion for regulating the attachment position of the coupling 4.

Therefore, if the rotary table 18 is set so that its supporting protrusions 20 are located inside each support roller 17, the rotary table 18 will be largely eccentric with respect to the coupling 4, and the object to be heated will be placed on the rotary table. The rotary table 18 is placed in a stable state on the mounting member 10 without being tilted to the extent that it spills outside, or the peripheral edge of the rotary table 18 comes into contact with the inner wall of the heating chamber 1 and its rotation is stopped. It rotates reliably without slipping only by contact.

As described above, in this microwave oven, there is no relative movement in the contact area between the coupling 4 and the rotary table 18, which is formed by interposing the mounting member 10, so that the drive rollers and other parts on the lower peripheral edge of the rotary table do not move. Unlike a configuration in which power is transmitted by rolling contact, the contact portion suffers less damage such as wear and can be used for a long period of time.

Furthermore, since the rotary table 18 can be sufficiently rotated even without unevenness that engages with each other between the coupling 4 and the rotary table 18, manufacturing thereof is facilitated, and
The troublesome work of cleaning the recesses mentioned above is no longer necessary, and since there are no irregularities on the top surface of the mounting member 10, ordinary heat-resistant containers other than the rotary table 18 can be used as they are in the coupling 4.
Therefore, even if the rotary table 18 is damaged, cooking will not become impossible, and this is extremely advantageous when the object to be heated is a small item. Since no concave or convex portions are formed, the appearance of the rotary table 18 will not be impaired when it is used as a tray.

Next, an embodiment other than the above embodiment will be explained with reference to FIGS. 3 to 7. In the embodiment shown in FIG. Part 21
An annular mounting member 10 is fitted into the mounting member 10 so as to protrude slightly upward.

Therefore, it is only necessary to sequentially cut a pipe-shaped silicone rubber having a diameter slightly smaller than that of the notch 21 to form the mounting member 10, expand the diameter thereof slightly, and fit it into the notch 21.

Further, the supporting protrusion 20 is formed on the lower surface of the center of the rotary table 18 so as to correspond to the outer peripheral surface of the mounting portion 8 of the coupling 4 .

Therefore, the position of the rotary table 18 is determined by the coupling 4.
is carried out against

In the embodiment shown in FIG. 4, the mounting member 10 is fitted and fixed in a mounting recess 22 formed at the center of the upper surface of the mounting section 8 so as to slightly protrude upward, and the supporting protrusion 20 is attached to each support. It is formed so as to correspond to the outside of the roller 17.

In the embodiment shown in FIG.
It is fitted and fixed in a mounting recess 23 formed at the center of the lower surface of the coupling 8, so as to come into frictional contact with the upper surface of the mounting portion 8 of the coupling 4, which is formed flat.

In the embodiment shown in FIG. 6, the annular mounting member 10 is
The mounting member 8 is fitted into a notch 21 on the outer periphery, and is formed into a gentle mortar shape so that the upper surface of the mounting portion 8 slopes downward toward the center, so that the mounting member 10 is slightly protruded upward. It has become.

In the embodiment shown in FIG. 7, mounting recesses 22 are formed radially on the upper surface of the mounting section 8, and a rectangular parallelepiped mounting member 10 is fitted and fixed in the mounting recess 22 so as to protrude slightly upward. .

Although not shown, the mounting member 10 may be made of a material other than silicone rubber that has excellent heat resistance, low high frequency loss, and a large coefficient of friction, such as fluororubber; For fixing, a silicon adhesive or the like which has excellent heat resistance and does not cause high frequency loss may be used.

As described in detail above, the present invention interposes a member with a large friction coefficient between the rotary table and the coupling, connects the two so that rotation can be transmitted only by frictional contact, and when the rotary table is attached, the rotation is By using the annular support protrusion on the underside of the table for positioning, manufacturing is facilitated, and the annular support protrusion is placed on either the outer peripheral surface of the coupling or the inner H-law of the support roller on one side. The rotary table can be stably supported on the coupling by a simple positioning operation of matching, and the contact between the coupling, which is the rotational force transmitting part, and the rotary table is made by interposing a member with a large friction coefficient. There is no relative movement between the couplings, and there is little damage to the contact parts, allowing for long-term use. In addition, ordinary heat-resistant containers can be placed directly on the coupling for cooking; The table has an excellent effect of being able to be used as a tray.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the supporting state of the rotary table in a microwave oven embodying the present invention, Fig. 2 is a cross-sectional view showing the positional relationship between the coupling and the support roller, and Figs.
FIG. 7 is a sectional view and a perspective view showing other embodiments, respectively.

Claims (1)

[Claims for Utility Model Registration] (1) A coupling 4 arranged at the center of the bottom of the heating chamber 1 and rotated in a horizontal plane by a drive shaft 15; A rotary table 18 that is detachably attached to the coupling 4 and can be used as a tableware; and a cup that abuts the lower peripheral edge of the rotary table 18 to rotatably support the rotary table 18. In a microwave oven equipped with a plurality of support rollers 17 disposed on a circumference concentric with the rotation center of the ring 4, there is a coefficient of friction between the upper surface of the coupling 4 and the lower surface of the center of the rotary table 18. With a large member 1° interposed,
The coupling 4 and the rotary table 18 are connected to each other so that they rotate together only by frictional contact, and the rotary table 18 removed from the coupling 4 can be used as tableware on any arbitrary place such as a dining table. In order to reliably support the rotary table 18 when placed on a flat surface, an annular support protrusion 20 formed on the lower surface of the rotary table 18 is attached to the outer peripheral surface of the coupling 4 or the support roller 17 when the rotary table 18 is attached to the coupling 4. The electronic lens 02 is characterized in that it also serves as a positioning protrusion for regulating the mounting position of the rotary table 18 with respect to the coupling 4, corresponding to either the inner or outer side of the A microwave oven according to claim 1 of the utility model registration claim.