JPS6336959Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a turntable device for a microwave oven.

Prior Art In a microwave oven, there is a sleeve below the center of the turntable for attaching the turntable to the rotating shaft, so electric charges are concentrated at the ends of the sleeve, causing extremely high temperatures in the surrounding area. There is a risk that it may cause In addition, in order to agitate radio waves using a metal turntable, the turntable is sometimes provided with a through hole for transmitting high frequency waves, but in such cases, the liquid that boils over during cooking may be removed. The liquid flows through the hole through the back of the turntable and into the joint between the turntable and the rotating shaft, and if even a small amount of this liquid solidifies at the joint, it may prevent the turntable from attaching or detaching or rotating. It had the disadvantage of causing problems.

Purpose of the invention This invention was made to eliminate the above-mentioned drawbacks, and its purpose is to prevent the central part of the turntable from becoming extremely hot, and to prevent boiling spills from reaching the joints. To provide a turntable device for a microwave oven which can prevent heating from occurring.

Structure of the invention In order to achieve the above object, in this invention, a joint part is provided at the center of the back surface of the turntable, and is removably connected to the upper end of the rotating shaft that penetrates the bottom of the oven and protrudes inside. A plurality of through holes are formed in the turntable in the circumferential direction at positions spaced outward from the joint part, and an annular hanging wall is provided on the back surface of the turntable between the through holes and the joint part. There is.

Embodiment An embodiment embodying this invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 1, an oven 2 with an open front is fixed inside an outer box 1 of a microwave oven, and the open front portion can be opened and closed by a door 3. A magnetron 4 is installed at the rear bottom of the outer box 1.
is provided, and high frequency energy supplied from the magnetron 4 is introduced into the oven 2 via the waveguide 5. As shown in FIG. 2, an upper support frame 7 and a lower support frame 8, which are formed by bending a metal plate, are attached to the lower surface of the bottom wall of the central part at a predetermined interval vertically, and the upper support frame A bearing box 9 is fixed to the lower surface of 7.

A rotating shaft 13 extending vertically is rotatably inserted into and supported by a ball bearing 10 and a bearing metal 11 fitted at the upper and lower ends of the bearing box 9, respectively. Movement to is blocked. Further, the thrust load of the rotating shaft 13 is received by the ball bearing 10. The upper end of this rotary shaft 13 passes through a cylindrical portion 14 projecting from the center of the bottom wall of the oven 2, and projects into the interior of the oven 2.

A metal turntable 15 is disposed at the upper end of the rotating shaft 13. A locking rod 16 is fixed to the lower center surface of the turntable 15, and the locking rod 16 is removably fitted into a locking recess 17 formed in the upper end surface of the rotating shaft 13. or,
The turntable 1 is mounted on the outer periphery of the locking rod 16.
A support 1 having an inverted bottomed cylindrical shape is attached to the lower surface of the center of the 5.
8 is fixed at its bottom, and a support sleeve 19 protruding from the center of the bottom of the support 18 is removably inserted into the rotating shaft 13. Support 1
The outer peripheral wall 8 constitutes an annular hanging wall 20 located on the outer periphery of the rotating shaft 13 .

Further, the turntable 1 is positioned outwardly from the support sleeve 19 at a predetermined distance.
A plurality of through holes 15a for high frequency transmission are formed in the turntable 5 in its circumferential direction, and a placing plate 21 for placing food to be cooked is supported on the turntable 15. And the locking rod 1
6, the locking recess 17 and the support sleeve 19 constitute a joint portion.

The outer circumferential surface of the support sleeve 19 and the cylindrical portion 1
The gap between the inner peripheral surface of the magnetron 4 and the hanging wall 20 and between the hanging wall 20 and the bottom wall of the oven 2 is set to 1/4 or less of the wavelength of the high frequency wave outputted from the magnetron 4,
The spaces S1, S2 within the support 18 and between the upper support frame 7 and the oven 2 form yoked spaces.

On the other hand, a bear coil type motor 23 equipped with a gear box 22 containing a reduction gear mechanism is fixed to the lower surface of the lower support frame 8 in this gear box 22. A joint 25 is provided between the drive shaft 24 as the output shaft of the gear mechanism and the rotating shaft 13.
is interposed, and the rotation of the drive shaft 24 is transmitted to the rotating shaft 13 through the joint 25.

Therefore, when cooking food, the rotary shaft 13 is rotated in one direction via the drive shaft 24 and the joint 25 based on the drive of the motor 23, and the locking recess 17 and the locking rod 16 are engaged with each other. As a result, the turntable 15, support body 18, and support sleeve 19 are rotated together with the rotation shaft 13, and the food on the tray 21 is rotated. Furthermore, the food on the placing plate 21 is heated and cooked based on the operation of the magnetron 4.

In addition, when a plate smaller than the plate 21 shown in FIG. 1 is used during cooking, or when an object to be heated is placed directly on the turntable 15, some of the boiling over passes through the through hole 15a of the turntable 15 and falls on the turntable 1.
Even if the water flows along the back surface of the annular hanging wall 20
The overflow is blocked by the support sleeve 19.
Therefore, the risk of the overflow solidifying at the joint between the turntable 15 and the rotating shaft 13, i.e., at the support sleeve 19, can be prevented, the turntable 15 can be easily attached and detached for cleaning, and the turntable 15 can be rotated smoothly at all times.

Furthermore, since the gap between the hanging wall 20 and the bottom wall of the oven 2 is less than 1/4 of the wavelength of the high frequency wave, the high frequency wave that penetrates into the space S1 through the gap is small, but the high frequency wave that invades the space S1. Attenuated within S1. In addition, since the gap between the cylindrical part 14 and the support sleeve 19 is 1/4 or less of the wavelength of the high frequency,
Even less high-frequency waves enter the space S2 through this gap, but the high-frequency waves that do enter are further attenuated within the space S2. Therefore, the support sleeve 1
Electric charges are not concentrated on the ends of the turntable 9 or the cylindrical portion 14, thereby preventing the central portion of the turntable 15 from being heated to an extremely high temperature. Further, high frequency waves leaking to the outside from around the rotating shaft 13 can be almost eliminated.

Effects of the invention As detailed above, this invention can prevent the central part of the turntable from being heated to extremely high temperatures, and also prevents the joint between the turntable and the rotating shaft from heating up. It has the excellent effect of preventing the possibility of boiling spills entering and solidifying.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a microwave oven embodying this invention, FIG. 2 is a partially enlarged sectional view, and FIG. 3 is an enlarged sectional view showing a joint. In the figure, 2 is an oven, 13 is a rotating shaft, and 15
15a is a turntable, 15a is a through hole, 16 is a locking rod, 17 is a locking recess, 19 is a support sleeve (the joint portion is constituted by the aforementioned 16, 17, and 19), and 20 is an annular hanging wall.

Claims (1)

[Scope of utility model registration request] A joint part 1 that is removably connected to the upper end of a rotating shaft 13 that penetrates the bottom surface of the oven 2 and projects inside.
6, 17, and 19 are provided at the center of the back surface of the turntable 15, and a plurality of through holes 15a are provided in the turntable 15 in the circumferential direction at positions spaced outward from the joint portions 16, 17, and 19. The turntable device for a microwave oven is characterized in that an annular hanging wall 20 is provided on the back surface of the turntable between the through hole 15a and the joint parts 16, 17, 19.