JPH0317436Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a turntable device for a microwave oven that is capable of uniformly heating an object set in the microwave oven.

[Prior art]

The strength of radio waves within the heating chamber of a microwave oven is not uniform. Therefore, an inconvenience arises in that the object to be heated set in the microwave oven is not heated uniformly. For this reason, conventionally, a turntable for placing the object to be heated was installed at the bottom of the heating chamber of the microwave oven.
The rotation of the turntable allows the object to be heated to pass through areas where the radio waves are strong and areas where the radio waves are weak.
It is possible to apply uniform heating on average to the object to be heated. In this case, since the turntable only rotates on a horizontal plane, it is possible to obtain a uniform heating function in the plane, but it is not possible to obtain uniform heating in the vertical direction. In particular, there is a problem that the center of the turntable, which is the center of rotation, hardly moves not only in the vertical direction but also on the horizontal plane, and as a result, a good uniform heating function cannot be obtained at all.

Therefore, in recent years, as shown in FIGS. 3 and 4, the lower surface of the turntable 31 installed at the inner bottom of the microwave oven heating chamber 30 has been undulated in three locations in a gentle wave shape in the circumferential direction. A wavy undulating surface 32 is formed with peaks and troughs, and an annular rack 33 is formed on the outer circumferential side of the wavy undulating surface 32. The two support rollers 35, 3 are meshed with the annular rack 33 from the side and arranged equiangularly from the set position of the drive gear 34.
5 is provided slightly on the inner circumferential side of the annular rack 33,
A structure has been proposed in which the turntable 31 is supported at three points by a drive gear 34 and two support rollers 35, 35. According to such a turntable device, since the turntable surface moves up and down as the turntable 31 rotates, the object to be heated on the turntable 31 is heated while moving on the horizontal plane and in the up and down direction.

However, in the above conventional example, the turntable 3
Since the rotational drive of the turntable device depends on the engagement between the annular rack 33 and the drive gear 34, there is a risk of generating noise, and the structure of the turntable device becomes extremely complicated due to the gear drive, and is expensive. In addition to requiring precision, there were problems in that the defective rate on the machined surface was high and the manufacturing cost was high.

[Purpose of invention]

The present invention has been developed in consideration of the above-mentioned conventional problems, and is capable of uniformly heating the object while simultaneously moving it horizontally and vertically as the turntable rotates. The object of the present invention is to provide a turntable device for a microwave oven that avoids the generation of noise that tends to occur when the table rotates, has a simplified structure, and reduces manufacturing costs.

[Structure of the idea]

In the turntable device for a microwave oven according to the present invention, a rotational drive source is connected to the central part, and a satellite roller that rolls in contact with the inner bottom surface of the heating chamber rotates on a plurality of shaft parts extending radially from the central part. A freely attached branch shaft is provided, and the branch shaft is attached to the orbital surface of the satellite roller in rolling contact with the satellite roller on at least one of the lower surface of the turntable supported on each satellite roller and the inner bottom surface. A wavy undulating surface is formed to cause the turntable to move up and down while maintaining a substantially horizontal state of the turntable during rotational driving, so that the turntable simultaneously moves up and down when the turntable is rotated. It is characterized by being configured so that it can be carried out.

[Embodiment 1] An embodiment of the present invention will be described below based on FIG. 1.

A turntable 2 is installed on the inner bottom surface of a heating chamber 1 of the microwave oven. The lower surface of the turntable 2 is gently undulated in the circumferential direction that forms the orbital surface of the satellite roller, forming a wavy undulating surface 3 having three peaks and troughs.
Further, on the inner bottom surface of the heating chamber 1, a central portion 4a serving as a rotation center is arranged near the center of the bottom of the heating chamber 1, and three shaft portions extend radially in the horizontal direction from the central portion 4a at equal angular intervals. A branch shaft 4 formed in an elongated manner is installed. Satellite rollers 5, 5, 5 are rotatably provided at the tip of each shaft portion of the branch shaft 4, and the center portion 4a of the branch shaft 4 substantially coincides with the center line of the turntable 2, and furthermore, the branch shaft 4 The distance from the center portion 4a to the satellite rollers 5, 5, 5 at the tip of each shaft portion is set to be constant. In a state where the branch shaft 4 is installed on the inner bottom surface of the heating chamber 1, the three satellite rollers 5, 5, 5 are connected to the satellite rollers of the undulating surface 3 formed on the lower surface of the turntable 2. It is in rolling contact with the raceway surface and supported from below, forming a three-point support structure.

On the other hand, in the center of the bottom of the heating chamber 1, there is a heating chamber 1
A drive shaft 6 of a motor M serving as a rotational drive source installed on the outside of the heating chamber 1 projects inside the heating chamber 1 . A connecting joint 7 is provided at the shaft end of the drive shaft 6, and is removably fitted into and connected to the downward recess 4b formed in the central portion 4a of the branch shaft 4 from below. The branch shaft 4 is configured to be able to rotate integrally with the drive shaft 6 around the center.

Note that each of the satellite rollers 5 described above rotates on a concentric orbital surface, but the number thereof is not limited to three as in the embodiment, and may be three or more that can support the turntable 2 in a stable state. If so, the specific number does not matter. The diameter of the satellite roller 5 is
Of course, the size should exceed the vertical movement width of the turntable 2. Also turntable 2
The wavy undulating surface 3 formed on the lower surface has three peaks and troughs that are gently wavy in the circumferential direction forming the satellite roller orbital surface, corresponding to the number of the satellite rollers 5. However, the number of undulations may be the same as the number of satellite rollers 5, or an integral multiple thereof.

Regarding the above configuration, when the motor M is started, the branch shaft 4 rotates integrally with the drive shaft 6 around its central portion 4a. As a result, the satellite rollers 5, 5, 5 provided at the tip of each shaft part of the branch shaft 4 rotate on the same circumference while rolling on the inner bottom surface of the heating chamber 1, which forms a flat surface. . At the same time, each satellite roller 5, 5,
Turntable 2 placed on and supported by 5
rotates concentrically with the branch shaft 4 as the satellite rollers 5, 5, 5 rotate. in this case,
Since the lower surface of the turntable 2 is formed with a gently undulating surface 3 having peaks and troughs equal to or an integral multiple of the number of satellite rollers 5, the turntable 2 can be rotated in the vertical direction. Move to. Further, the rotational speed of the turntable 2 at this time is determined by the sum of the circumferential feed length due to the rotation of the satellite roller 5 and the amount of displacement of the satellite roller 5 itself.
This is approximately twice the rotation speed of . However, since the wavy undulating surface 3 is formed on the orbital surface of the satellite roller on the lower surface of the turntable 2, the inner bottom orbital surface of the heating chamber 1 is formed flat, whereas the orbital surface of the satellite roller on the lower surface of the turntable 2 is The length of the raceway surface becomes slightly larger, and the rotational speed of the turntable 2 becomes slightly slower than twice the rotational speed of the drive shaft 6 accordingly. In this way, the turntable 2 rotates at a speed slightly slower than twice the rotational speed of the drive shaft 6, and at the same time moves up and down by the undulating surface 3, so that the upper surface position of the turntable 2 is moved up and down. If the object to be heated always passes through a place where the radio wave intensity is the same, there will be no deviation.

In this way, in the above embodiment, the object to be heated on the turntable 2 moves vertically at the same time as it rotates horizontally, so it is heated in the same state as if it were sufficiently stirred by radio waves. Therefore, a more uniform heating state can be obtained. Further, in the above configuration, since the meshing structure between the annular rack and the drive gear is not adopted, and the feeding structure is based on the satellite roller 5, it is possible to avoid the situation where noise is generated when the turntable 2 rotates. At the same time, its structure makes it easy to clean, making it easy to maintain sanitary conditions inside the refrigerator. Furthermore, since the structure of the entire device, especially the structure of the turntable 2 itself, is simplified, manufacturing becomes easier, which in turn can promote cost reduction. Furthermore, the peaks of the undulating surface 3 on the lower surface of the turntable 2 can also be used as legs of the turntable 2. Furthermore, such a turntable 2 can be applied to a conventional turntable rotating microwave oven by only partially improving it.

[Embodiment 2] FIG. 2 shows another embodiment of the present invention, in which, contrary to the first embodiment, the lower surface of the turntable 2 is formed flat, while the heating chamber 1 is formed flat. It has a structure in which a wavy undulating surface 3 having gentle peaks and valleys in the circumferential direction is formed on the orbital surface of the satellite roller formed on the inner bottom surface, and the other structure is the same as that of the first embodiment. be. For convenience of explanation, corresponding members having the same functions as those in the first embodiment are given the same reference numerals.

According to this embodiment, as in the first embodiment, the turntable 2 moves vertically while rotating due to the undulating surface 3 formed on the inner bottom surface of the heating chamber 1. Further, the rotational speed of the turntable 2 at this time is determined by the sum of the circumferential feed length due to the rotation of the satellite roller 5 and the amount of displacement of the satellite roller 5 itself.
This is approximately twice the rotation speed of . However, since a wavy undulating surface 3 is formed on the satellite roller orbital surface on the inner bottom surface of the heating chamber 1, heating The length of the inner bottom raceway surface on the chamber 1 side becomes slightly larger, and the rotational speed of the turntable 2 becomes slightly faster than twice the rotational speed of the drive shaft 6 accordingly. In this way, the turntable 2 rotates at a speed slightly faster than twice the rotational speed of the drive shaft 6,
At the same time, since it moves up and down along the undulating surface 3, the top surface of the turntable 2 moves with a shift in its vertical position, and if the object to be heated always passes through a place with the same radio wave intensity, there will be no distortion. Similar to the first embodiment, the turntable 2
It is possible to avoid a situation where noise is generated due to the rotation of the device, and since the structure of the entire device is simplified, manufacturing becomes easy and costs can be reduced.

As described above, the undulating surface 3 formed on the orbital surface of the satellite roller of the present device may be the orbital surface of at least one of the lower surface of the turntable 2 and the inner bottom surface of the heating chamber 1.

[Effect of idea]

As described above, in the present invention, a rotary drive source is connected to the central part, and a satellite roller that rolls in rolling contact on the inner bottom surface of the heating chamber is rotatably connected to a plurality of shaft parts extending radially from the central part. An attached branch shaft is provided, and the rotation drive of the branch shaft is applied to the orbital surface of the satellite roller in rolling contact with the satellite roller on at least one of the lower surface of the turntable supported on each satellite roller and the inner bottom surface. The structure is such that a wavy undulating surface is formed to cause the turntable to move up and down while maintaining the turntable in a substantially horizontal state.

Therefore, since the object to be heated on the turntable is horizontally rotated and simultaneously moved in the vertical direction, it is heated in the same state as if it were sufficiently stirred by radio waves, and more uniform heating can be achieved. Since such a moving operation is caused by the sending-out structure using the satellite roller, it is possible to reduce the noise generated in the conventional meshing structure between the annular rack and the driving gear. Furthermore, since the structure of the entire device, especially the structure of the turntable itself, is simplified, manufacturing is facilitated, which has the effect of promoting cost reduction.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of the main part showing one embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the main part showing another embodiment of the invention, and Fig. 3 is a longitudinal sectional view of the main part showing a conventional example. ,
FIG. 4 is an explanatory diagram of the turntable in FIG. 3, viewed from the bottom side. 1 is a heating chamber, 2 is a turntable, 3 is a wave-like undulating surface, 4 is a branch shaft, 4a is a central portion, 5 is a satellite roller, 6 is a drive shaft, and M is a motor (rotary drive source).

Claims (1)

[Scope of utility model registration request] A rotary drive source is connected to the central part, and branch shafts are provided on a plurality of shaft parts extending radially from the central part to which satellite rollers are rotatably attached to rotate on the inner bottom surface of the heating chamber. The turntable is maintained in a substantially horizontal state when the branch shaft is driven to rotate on at least one of the lower surface of the turntable supported on the satellite roller and the inner bottom surface, and the satellite roller is in rolling contact with the satellite roller orbital surface. A turntable device for a microwave oven, characterized in that a wavy undulating surface is formed to cause the turntable to move up and down.