KR19980050375U - Microwave Tray Driver - Google Patents

Abstract

The present invention discloses an improved tray drive of a microwave oven.

In the related art, since the tray on which food is placed is simply rotated on the bottom plate of the cooking chamber, high frequency radiation emitted from one side wall of the cooking chamber is concentrated only on a specific portion of the food chamber, making it difficult to uniformly cook.

In the present invention, a tray motor installed in the cabinet, a drive shaft rotatably supported by the bottom plate of the cooking chamber, electrically coupled to the rotating shaft of the tray motor, having a drive gear, and a guide boss having a screw hole installed in the cabinet as one side of the tray motor. And, one end is electrically coupled with the tray through the bottom plate of the cooking chamber, the other end is screwed to the guide boss, and the upper and lower flanges spaced at regular intervals in the middle portion, and the drive gear of the drive shaft and the driven gear therebetween. The lifting rod and the upper and lower inverting switches for rotating the tray motor in the forward or reverse direction as the upper and lower flanges come into contact with each other by the movement of the lifting rod are provided. To make it easy to cook.

Description

Microwave Tray Driver

The present invention relates to a microwave oven, and more particularly, to an apparatus for driving a tray in which food is placed.

Microwave oven is a device that cooks by molecular resonance of food by irradiating food to be cooked by high frequency oscillated from magnetron, unlike heating cooking method that cooks food by heating directly. Food can be cooked without burning, as well as the benefits of being cooked evenly.

1 schematically illustrates an example of such a microwave oven. This is done by placing food W to be cooked on a tray 6 provided in a cavity 2 of a cabinet 1 and closing and operating a door (not shown). The high frequency is oscillated from the magnetron 4 of) and irradiated into the cooking chamber 2 through a wave guide 5 installed on one wall of the cooking chamber 2. At the same time, the tray 6 is rotated along the guide roller 8 by the tray motor 7 below the cooking chamber 2 so that the food W is uniformly cooked. The remaining code 9 is a cooling fan for cooling the electrical equipment.

However, the high frequency is irradiated into the cooking chamber 2 from one side wall of the cooking chamber 2, the tray (6) on which the food (W) is placed on the bottom surface of the cooking chamber (2) simply rotates because most of the high frequency food It is absorbed by the side part of (W). Accordingly, there was a high possibility that the upper side of the food W would be too cooked or the lower part would be uncooked. Therefore, the conventional microwave oven has a problem that the food W cannot be cooked uniformly and efficiently despite the rotation of the tray 6.

It is an object of the present invention to provide a tray driving apparatus of a microwave oven capable of uniformly cooking food in general by rotating and lifting the tray in view of the above-described conventional problems.

In order to achieve the above object, a tray drive apparatus of a microwave oven according to the present invention includes a cabinet having a cooking chamber, a magnetron that oscillates a high frequency wave and radiates it into the cooking chamber, a wave guide that guides the high frequency wave into the cooking chamber, and a cooking chamber. A microwave oven having a tray for placing food to be cooked, etc., comprising: a tray motor installed in a cabinet, a drive shaft rotatably supported on a bottom plate of a cooking chamber, electrically coupled to a rotating shaft of the tray motor, and having a drive gear; A guide boss installed in the cabinet on one side of the tray motor and having a screw hole, and one end is electrically coupled with the tray through the bottom plate of the cooking chamber, and the other end is screwed into the guide boss and spaced at a certain interval from the middle part. , Having a lower flange and a driven gear meshed with the drive gear of the drive shaft therebetween. And a lifting rod and an upper and lower inverting switch for rotating the tray motor in a forward or reverse direction as the upper and lower flanges come into contact with each other by the movement of the lifting rod. do.

According to one preferred feature of the present invention, the lower surface of the tray is provided with a hub (hub) that is electrically coupled with the upper end of the lifting rod.

Accordingly, the present invention, as the tray is rotated and the inside of the cooking chamber is elevated to a certain height, so that food is cooked uniformly as compared to the prior art, thereby exhibiting a great effect on improving cooking performance and reliability of a microwave oven.

1 is a cross-sectional view schematically showing an example of a general microwave oven,

2 is a cross-sectional view showing a tray driving apparatus according to the present invention,

3 is a cross-sectional view taken along the III-III of FIG.

4 is a cross-sectional view taken along the IV-IV of FIG.

5 is a cross-sectional view showing the operation of the present invention.

<Description of the code | symbol about the principal part of drawing>

1: cabinet 2: cooking chamber

2a: base plate 4: magnetron

6: tray 6a: (tray) hub

7: tray motor 7a: rotary shaft (of tray motor)

11: driving shaft 12: drive gear (of drive shaft)

14: guide boss 14a: screw hole (of guide boss)

15: lifting rod 16: driven gear (of lifting rod)

17, 18: upper and lower flanges (of lifting rod)

20, 22: upper and lower reverse switch

Such specific features and other advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings, with reference to FIG.

1 and 2, the microwave oven according to the present invention is provided with a cooking chamber (2) in which food (W) is placed on one side of the cabinet (1), and is opened and closed by a door (not shown), and the electric chamber (3) on the other side. ) Is provided. On the bottom plate 2a of the cooking chamber 2, a disk-shaped tray 6 on which the food W to be cooked is placed is provided. In the electric compartment 3, a wave guide 5 for inducing high frequency to the cooking chamber 2 is fixed to the outer wall surface of the cooking chamber 2, and the wave guide 5 is driven by a cooking signal to generate a magnetron for oscillating high frequency. (4) is installed.

Meanwhile, according to a feature of the present invention, a housing (housing: 10) is installed at the bottom of the bottom plate (2a) of the cooking chamber (2), and a tray motor (7) for driving the tray (6) is installed at one side of the housing (10). do. The drive shaft 11 having the drive gear 12 is rotatably coupled to the rotary shaft 7a of the tray motor 7 through the shaft hole 11a formed in the lower end thereof in the axial direction. To this end, the front end of the tray motor 7 and the shaft hole 11a of the drive shaft 11 are configured to be rotated together by, for example, being configured in a substantially half moon shape corresponding to each other so that relative rotation is impossible. The upper end of the drive shaft 11 is preferably rotatably supported by a bracket 13 provided on the bottom surface of the bottom plate 2a of the cooking chamber 2 for stable rotation.

A guide boss 14 having a screw hole 14a in the axial direction is provided in the housing 10 adjacent to the tray motor 7 in a vertical direction, and a tray motor is provided in the screw hole 14a of the guide boss 14. The elevating rod 15 which is rotated by (7) and ascends in the vertical direction is movably coupled through the screw 15a formed at the lower end thereof. The upper end of the elevating rod 15 is electrically coupled to the tray 6 provided in the cooking chamber 2 through a through hole 2b formed in the bottom plate 2a of the cooking chamber 2. To this end, the lower surface of the tray 6 is preferably provided with a hub 6a for inserting the upper end of the elevating rod 15, and the inner diameter of the upper end of the elevating rod 15 and the hub 6a may be, for example. As shown in Fig. 4, they are rotated together by being formed in substantially half moon shapes corresponding to each other.

Upper and lower flanges 17 and 18 are provided at regular intervals in the middle of the elevating rod 15, and the driving gears of the drive shaft 11 are disposed between the upper and lower flanges 17 and 18. 12) and a driven gear 16 to be engaged therewith. At this time, since the lifting rod 15 should be moved up and down simultaneously with the rotation of the drive shaft 11, the driven gear 16 has a sufficient length to move up and down by a predetermined stroke in consideration of the length of the drive gear 12. Is set to. In addition, a bush 19 for inserting the elevating rod 15 for smooth rotation and movement of the elevating rod 15 is provided in the through hole 2b of the bottom plate 2a of the cooking chamber 2.

On the other hand, in order for the lifting rod 15 to move up and down by a predetermined stroke, the driving direction of the tray motor 7 must be reversed appropriately. To this end, for example, an upper reversing switch 20 for inverting the tray motor 7 in contact with the upper flange 17 of the lifting rod 15 is provided at the bottom of the bottom plate 2a of the cooking chamber 2. Is installed through, the inner side wall of the housing 10, the lower reverse switch 22 for inverting the tray motor 7 in contact with the lower flange 18 of the lifting rod 15 is also through the bracket 23 Is installed. The upper and lower reversal switches 20 and 22 may be configured in various ways. Preferably, the contacts 20a and 22a contact the upper and lower flanges 17 and 18 of the elevating rod 15. ) Is composed of micro switches each having one side.

The operation of the microwave tray driving apparatus according to the present invention configured as described above will be described with reference to FIG. 5.

In FIG. 5, the food W to be cooked on the tray 6 is first opened, the door is closed, and the microwave is operated, and the high frequency is oscillated in the magnetron 4 to be irradiated into the cooking chamber 2. At the same time, as shown in (a), the drive motor 11 is rotated in a predetermined direction by driving the tray motor 7, and accordingly, the driven gear 16 with which the drive gear 12 of the drive shaft 11 is engaged is engaged. As a result, the lifting rod 15 is rotated in the opposite direction to the drive shaft 11. Then, the lifting rod 15 is guided to the guide boss 14 to ascend, so that the tray 6 is rotated and ascends in the cooking chamber 2.

When the lifting rod 15 is raised in this manner and the upper flange 17 presses the contact 20a of the upper inversion switch 20 as shown in (b), the upper inversion switch 20 is operated. The inverted signal is sent to the tray motor 7. Then, as the tray motor 7 is driven in the reverse direction as shown in (b), the drive shaft 11 is rotated in the opposite direction. Accordingly, the lifting rod 15 is rotated in the opposite direction to the drive shaft 11 to guide the boss 14. Descends. Therefore, the tray 6 in the cooking chamber 2 rotates in the reverse direction and descends at the same time.

Meanwhile, when the lifting rod 15 descends and the lower flange 18 presses the contact 22a of the lower inversion switch 22 as shown in (a), the lower inversion switch 22 operates. Then, the inverted signal is sent to the tray motor 7.

As a result, the tray 6 is rotated forward and backward in the above-described manner, and the inside of the cooking chamber 2 is repeatedly raised and lowered so that the entire portion of the food W is evenly exposed to high frequency. Concentration of high frequency with respect to is suppressed as much as possible, and a very uniform cooking is attained.

As described above, according to the present invention, since the tray rotates at the same time as the cooking chamber, the concentration of the high frequency to a specific portion of the food as in the prior art is suppressed as much as possible, so that the whole food is evenly exposed to the high frequency. Therefore, the food can be cooked more uniformly than in the prior art. Therefore, the present invention has an excellent effect of greatly improving the cooking performance and reliability of the microwave oven.

Claims (3)

A microwave oven including a cabinet having a cooking chamber, a magnetron oscillating high frequency into the cooking chamber, a wave guide for inducing the high frequency into the cooking chamber, and a tray for placing food to be cooked in the cooking chamber. In A tray motor 7 installed in the cabinet 1, A drive shaft 11 rotatably supported by the bottom plate 2a of the cooking chamber 2 and electrically coupled to the rotary shaft 7a of the tray motor 7, and having a drive gear 12; A guide boss 14 installed in the cabinet 1 to one side of the tray motor 7 and having a screw hole 14a; Upper and lower flanges 17 having one end penetrated through the bottom plate 2a of the cooking chamber 2 and being electrically coupled to the tray 6 and the other end is screwed to the guide boss 14 and spaced apart at a predetermined interval from the middle part. (18) and a lifting rod (15) having a drive gear (12) of the drive shaft (11) and a driven gear (16) engaged therebetween; The upper and lower reverse switches 20 and 22 rotate the tray motor 7 in a forward or reverse direction as the upper and lower flanges 17 and 18 contact each other by the movement of the lifting rod 15. Microwave tray drive device characterized in that the configuration. 2. The tray drive apparatus according to claim 1, wherein a hub (6a) is provided on a lower surface of the tray (6) to be electrically coupled with an upper end of the lifting rod (15). The tray driving apparatus of claim 1, wherein the upper and lower inverting switches (20, 22) are constituted by micro switches.