KR19980050367U - 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, the cylinder is installed in the cabinet, the guide block having a predetermined interval spaced to the lower side of the bottom of the cooking chamber, and one end through the bottom plate of the cooking chamber, and electrically coupled to the tray and the other end is movable to the cylinder An elevating rod having an upper and lower flange coupled to the intermediate portion and spaced apart from each other at an intermediate portion thereof, and a screw engaged with the threaded hole of the guide block therebetween, and being movably supported in the cylinder in an axial direction. The tray motor is electrically coupled with the lower end, and the upper and lower inverting switches rotate 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, so that the tray is elevated as the tray rotates. By doing so, the food can be cooked uniformly.

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 including a tray for placing food to be cooked and the like, comprising: a cylinder installed in a cabinet, a guide block installed at a predetermined interval below the cooking chamber bottom plate, and having a screw hole; One end is electrically coupled to the tray through the bottom plate of the cooking chamber, the other end is movably coupled to the cylinder and has a screw coupled to the screw hole of the guide block between the upper and lower flanges spaced at a certain interval in the middle A lifting rod and a cylinder are supported movably in the axial direction and the rotating shaft is a lifting rod. To the bottom of the electric motor and the movement of the tray, the lifting rod is coupled to the phase, phase, characterized in that is constituted by including a lower reversing switch for the lower flange to rotate the tray motor forward or in reverse as the contact respectively.

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.

According to another preferred feature of the present invention, at least one guide slit is formed on the main surface of the cylinder in the axial direction, and at least one guide pin movably fitted to the guide slit of the cylinder on the main surface of the tray motor ( guide pin) is provided.

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)

7b: guide pin (of tray motor)

11: cylinder

11b: guide slit

12: guide block 13a: screw hole (of the guide block)

15: lifting rod 16: screw (of lifting rod)

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

20, 21: 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 on a lower surface of the bottom plate 2a of the cooking chamber 2, and a cylinder 11 is installed in a vertical direction on the bottom surface of the housing 10. On the upper side of the cylinder 11, the guide block 12 having the screw hole 13a in the vertical direction in its body 13 is fixed to the bottom plate 2a of the cooking chamber 2 through the legs 14. It is supported and the lifting rod 15 is screwed into the screw hole 13a of the guide block 12.

The upper end of the elevating rod 15 is electrically coupled to the tray 6 provided in the cooking chamber 2 through the through hole 2b of the bottom plate 2a of the cooking chamber 2, and a lower end thereof penetrates the cylinder 11. It is movably coupled to the hole 11a. 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. 3, they are formed in substantially half-moon shapes corresponding to each other, and are configured to rotate together by being combined such that relative rotation is impossible.

Upper and lower flanges 17 and 18 are formed at regular intervals in the middle of the elevating rod 15, and the guide block 12 is provided on the elevating rod 15 between the two flanges 17 and 18. The screw 16 is formed to be coupled to the screw hole 13a. Accordingly, the upper and lower flanges 17 and 18 of the elevating rod 15 have sufficient spacing for the thickness of the body 13 of the guide block 12 so that the tray 6 can elevate with a predetermined stroke. Spaced apart.

Inside the cylinder 11, a tray motor 7 for driving the tray 6 is installed to be movable, and its rotary shaft 7a is electrically coupled to the lower end of the lifting rod 15. To this end, a shaft hole 15a is formed in the lower end of the elevating rod 15 in the axial direction. The shaft hole 15a and the rotating shaft 7a of the tray motor 7 are also shown in FIG. They are rotated together by being formed in substantially half moon shapes corresponding to each other. In addition, the through hole 2b of the bottom plate 2a of the cooking chamber 2 is preferably provided with a bush 19 for inserting the lifting rod 15 for smooth rotation and movement of the lifting rod 15.

On the other hand, the tray motor 7 should not rotate. Preferably, two guide slits 11b are formed to face the main surface of the cylinder 11 in the axial direction, and the cylinder 11 on the main surface of the tray motor 7. Two guide pins (7b) are provided to be movable to the guide slit (11b) of each of the) to support the tray motor 7 to the cylinder (11) to be lifted and lowered. Accordingly, the compression coil spring 22 is preferably interposed between the tray motor 7 and the bottom surface of the housing 10 to more stably support the tray motor 7.

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, the upper reversing switch 20 for inverting the tray motor 7 is installed on the upper surface of the body 13 of the guide block 12 in contact with the upper flange 17 of the lifting rod 15. The lower reversing switch 21 for inverting the tray motor 7 is provided on the lower surface thereof in contact with the lower flange 18 of the lifting rod 15. Here, the upper and lower body 13 of the guide block 12 is preferably formed with switch seating grooves 13b and 13c on which the upper and lower reverse switches 20 and 21 are respectively seated.

The upper and lower reversal switches 20 and 21 may be configured in various ways. Preferably, the contacts 20a and 21a 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 rotary shaft 7a of the tray motor 7 is driven in the forward direction so that the lifting rod 15 is rotated in the east direction. Then, the lifting rod 15 is guided and raised by the screw 16 coupled to the threaded hole 13a of the guide block 12, whereby the tray 6 is rotated and simultaneously raised in the cooking chamber 2. Done. At this time, the tray motor 7 is also raised along the guide slit 11b of the cylinder 11 by the guide pin 7b.

As such, when the lifting rod 15 is raised and the lower flange 18 presses the contact 21a of the lower inversion switch 21 as shown in (b), the lower inversion switch 21 is operated. The inverted signal is sent to the tray motor 7. Then, the tray motor 7 is driven in the reverse direction as shown in (b) so that the lifting rod 15 is rotated in the same direction to descend along the guide block 12. Accordingly, the tray 6 in the cooking chamber 2 rotates in the reverse direction and simultaneously descends.

Meanwhile, when the lifting rod 15 descends and the upper flange 17 presses the contact 20a of the upper inversion switch 20 as shown in (a), the upper inversion switch 20 operates. Then, the inverted signal is sent to the tray motor 7 again.

In this operation, the tray 6 rotates in the forward and reverse directions, and the inside of the cooking chamber 2 is repeatedly lifted so that the entire portion of the food W is evenly exposed to the high frequency. Concentration of is suppressed as much as possible, and very uniform cooking becomes possible.

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 (4)

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 cylinder 11 installed in the cabinet 1, A guide block 12 installed at a predetermined interval below the cooking chamber 2 and the bottom plate 2a and having a screw hole 13a; The upper and lower flanges of which one end penetrates through the bottom plate 2a of the cooking chamber 2 and is electrically coupled to the tray 6, and the other end is movably coupled to the cylinder 11, and spaced a predetermined distance from the middle part. A lifting rod 15 having a screw 16 engaged with the screw hole 13a of the guide block 12 therebetween; A tray motor 7 supported movably in an axial direction inside the cylinder 11 and having a rotary shaft 7a electrically coupled to a lower end of the elevating rod 15; The upper and lower reverse switches 20 and 21 rotate the tray motor 7 in a forward or reverse direction as the upper and lower flanges 17 and 18 come into contact with each other by 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 guide slit of claim 1 or 2, wherein at least one guide slit 11b is formed on the main surface of the cylinder 11 in the axial direction, and the guide slit of the cylinder 11 on the main surface of the tray motor 7. At least one guide pin (7b) that is movably fitted to (11b) is provided with a tray drive apparatus for a microwave oven. The tray driving apparatus of claim 1, wherein the upper and lower inverting switches (20, 22) are constituted by micro switches.