KR100190677B1 - Electronic oven - Google Patents

Abstract

The present invention relates to a microwave oven capable of uniformly heating a food placed on a rotating plate and preventing local concentration of electric field in the heating chamber. And a cylindrical second rotary shaft 10 installed concentrically and rotatably installed at an outer periphery of the first rotary shaft 9, protruding toward the shaft and installed rotatably. And a rotary plate 7 disposed on the upper side of the rotary network 6 to the first rotary shaft 9 while being configured to rotately drive the rotary network 6 by the second rotary shaft 10. And the first rotary shaft 9 and the second rotary shaft 10 are rotated at different rotational speeds.

Description

microwave

1 is a longitudinal sectional front view of the periphery of the bottom surface portion of a heating chamber according to the present invention;

2 is an enlarged longitudinal sectional front view around the first and second rotary shafts;

3a is a plan view of a rotating net and a rotating plate;

3b is a plan view showing a state in which the rotating network is rotated 1/4 turn (a half turn of the turntable);

4 is a perspective view of the entire microwave oven.

* Explanation of symbols for main parts of the drawings

3: heating chamber 6: rotating network

7: rotating plate 9: first rotating shaft

10: second rotating shaft 11, 12, 19: bearing

13: first gear 14: second gear

15: bottom wall 15a, 17a, 18a, 28b: through hole

17: first frame 17b, 18b: burring portion

18: second frame 20: weight sensor

23: motor 24: rotating shaft

25: two-stage gear 26: third gear

27: fourth gear 20: flange portion

30: cylindrical portion 31: roller (roller means)

32: pin 33: fitting recess

34: convex convex part

The present invention relates to a microwave oven configured to heat-cook foods on a rotating plate while rotating both while the rotating plate is placed on the rotating mesh.

In a microwave oven, the rotating net is rotatably installed at the bottom of the heating chamber, and the rotating plate is detachably mounted on the rotating net. In this case, the rotating plate and the rotating network are configured to be integrally driven to rotate. Here, the rotating plate is composed of, for example, heat-resistant glass, and the rotating network is formed by applying a glaze treatment to, for example, a steel sheet having a lattice shape. In addition, microwaves reflected from the bottom surface of the heating chamber among the microwaves supplied from the magnetron to the heating chamber are irradiated to the food on the rotating plate through the rotating plate through the rotating network and the rotating plate.

In this structure, microwaves are hardly irradiated to the part (the part which becomes a shadow) of the rotating network corresponding to the grid | lattice-shaped part of the bottom part of a foodstuff. On the other hand, microwaves are sufficiently irradiated to the bottom surface portions other than the above portion of the food. For this reason, there is a problem in that the heating spots are formed on the food and the electric field strength is locally concentrated in the heating chamber.

Accordingly, an object of the present invention is to provide a microwave oven capable of uniformly heating food and preventing local concentration of electric field in the heating chamber.

The microwave oven of the present invention is concentric with the heating chamber for heating the food by microwaves supplied from the magnetron, a first rotating shaft protruding upward and being rotatably installed at the bottom of the heating chamber, and rotatably mounted on the first rotating shaft. A cylindrical second rotating shaft installed in a shape and rotatably installed, a rotating mesh driven by the first rotating shaft, and a rotating plate disposed on the upper side of the rotating mesh and driven by the second rotating shaft. Thus, the first rotary shaft and the second rotary shaft is characterized in that configured to rotate at a different rotation speed.

According to the said structure, it was set as the structure which rotates a rotating plate and a rotating network at a different rotational speed by rotating a 1st rotating shaft and a 2nd rotating shaft at a different rotational speed. As a result, the correspondence between the bottom surface of the food on the rotating plate and the lattice portion of the rotating network is shifted with rotation, so that microwaves are uniformly irradiated on the bottom surface of the food. As a result, the food is uniformly heated and at the same time, there is no local concentration of electric field strength in the heating chamber.

In the above configuration, the first rotary shaft is installed to penetrate the rotary net and the rotary plate is driven by the first rotary shaft, and the second rotary shaft is fitted to the outer circumference of the first rotary shaft. It is a cylindrical shaft, and it is preferable to comprise so that a rotation network may be rotationally driven by this 2nd rotation shaft.

In addition, a roller means comprising a sliding part or preferably three or more rollers is installed on the outer circumference of the rotating mesh or the rotating plate, and the rotating plate relative to the rotating mesh by the sliding portion or the roller means. It is more preferable to configure to be rotatable and to configure a load acting on the rotating plate to act as the rotating network through the sliding portion or the roller means.

In addition, a first gear is provided to be integrally rotated on the first rotary shaft, and is provided concentrically on the first gear and at the same time, a second gear is integrally rotated to the second rotary shaft and is rotated by a motor. And a third gear installed to be driven and engaged with the first gear, and configured to include a fourth gear installed to be driven to rotate by the motor and engaged with the second gear. With such a configuration, a configuration in which the first rotational shaft and the second rotational shaft are rotated at different rotational speeds can be easily realized with a simple configuration.

Meanwhile, the first rotary shaft is rotatably supported by bearings pushed into upper and lower ends in the concentric second rotary shaft, and the second rotary shaft is rotatably supported by an attachment frame provided at an outer bottom of the heating chamber. It is preferable to make it. In this case, it is preferable to include a weight sensor for detecting the weight of the food placed on the rotating plate through the rotating plate, the roller means, the rotating net, the second rotating shaft, the second gear, and the first gear. Further, it is more preferable to configure the third gear and the fourth gear by integrally molded two-stage gears and to rotate the two-stage gears by one motor.

EMBODIMENT OF THE INVENTION Hereinafter, one Example which applied this invention to the microwave oven with a heater is demonstrated, referring drawings. First, in FIG. 4 showing a schematic overall configuration of a microwave oven, an inner box 2 having a rectangular box shape with an open front face is disposed in the outer box 1 constituting the main body of the microwave oven. The inside of this inner box 2 is the heating chamber 3. The front panel of the outer box 1 is provided with a door 4 for opening and closing the front opening of the heating chamber 3 and an operation panel 5 at the right side of the door 4.

In the outer box 1, a machine room is provided on the right side of the heating chamber 3, and a magnetron, its driving circuit, and a fan (not shown) for cooling the magnetron are arranged in the machine room. . The magnetron is configured to heat and cook food contained in the heating chamber 3 by supplying microwaves into the heating chamber 3 through an electromagnetic wave introduction tube (not shown).

In addition, planar heaters (not shown) are disposed in the ceiling and bottom portions of the heating chamber 3. Further, a hot air supply attachment (not shown) for circulating and supplying hot air into the heating chamber is disposed at the rear portion of the heating chamber 3. It is configured to heat cook (oven cook or grill cook) the food accommodated in the heating chamber 3 by the heater or hot air supply.

In addition, as shown in FIG. 1, a rotary shaft 8 for rotationally driving the rotary net 6 and the rotary plate 7 protrudes upwards at a substantially central portion of the inner bottom of the heating chamber 3. have. The rotary shaft 8 is composed of, for example, a ceramic first rotary shaft 9 and a cylindrical second rotary shaft 10 provided concentrically around the outer circumference of the first rotary shaft 9. In this case, as shown in FIG. 2, the annular bearings 11 and 12 made of metal wetted with oil are fixed to the upper end and the lower end of the second rotary shaft 10 by pressing. The first rotary shaft 9 is rotatably supported by the second rotary shaft 10 by inserting the first rotary shaft 9 into the bearings 11 and 12.

The upper end of the first rotary shaft 9 protrudes upward from the upper end of the second rotary shaft 10, and the lower end of the first rotary shaft 9 protrudes downward from the lower end of the second rotary shaft 10. . The first gear 13 is integrally molded, for example, so that the lower end of the first rotating shaft 9 protruding downward is integrally formed, and the lower end of the first rotating shaft 9 is formed at the lower portion of the first gear. It is configured to cover. In addition, the second gear 14 is integrally provided at the lower end of the second rotary shaft 19, and rotates integrally. The second gear 14 is rotatably mounted on the first gear 13. As a result, the second gear 14 is configured to be provided concentrically on the upper side of the first gear 13.

Here, the support mechanism for rotationally supporting the above-mentioned rotation shaft 8 (that is, the first rotation shaft 9 and the second rotation shaft 10) and the driving mechanism for rotationally driving will be described in detail. First, a through hole 15a (see also FIG. 2) is formed in a substantially central portion of the bottom wall 15 of the heating chamber 13 to insert the rotary shaft 8 therethrough. Moreover, the attachment plate 16 is fixed to the lower surface of the bottom wall part 15 by welding etc., The 1st frame 17 is attached to the lower surface of this attachment plate 16 by screwing. The second frame 18 is attached to the lower part of the first frame 17.

A through hole 17a (see FIG. 2) is formed in a portion of the first frame 17 corresponding to the through hole 15a of the bottom portion 15, and the rotating shaft is formed in the through hole 17a. (8) is inserted through. In this case, an annular bearing 19 made of metal wetted with oil is pressed into and fixed in the burring portion 17b formed when the through hole 17a is formed. Then, the second rotary shaft 10 is rotatably supported relative to the first frame 17 by inserting the second rotary shaft 10 of the rotary shaft 8 into the bearing 19.

Moreover, the weight sensor 20 of well-known structure is attached to the lower surface of the 2nd frame 18 by screw fixing etc., for example. The weight sensor 20 is composed of a movable plate 22 made of a fixed substrate 21 and a leaf spring provided on the lower surface of the fixed substrate 21, and the deflection by the load of the movable plate 22 is reduced. For example, it is detected by the capacitance change of the capacitor | condenser which is not shown in figure. In this case, a through hole 18a is formed in a portion of the second frame 18 corresponding to the through hole 17a of the first frame 17. The lower end of the first rotating shaft 9 is inserted into the through hole 18a by inserting the lower end of the first rotating shaft 9 (ie, the lower end of the first gear 13) into the weight sensor 20. It is a structure which abuts on the movable plate 22 of () rotatably.

Here, the burring portion 18b formed when the through hole 18a is formed is rotatably fitted into the groove 13a formed at the lower end of the first gear 13. As a result, the lower end portion of the first rotation shaft 9 is rotatably supported by the second frame 18. In this case, all the loads acting on the first rotating shaft 9 and the first gear 13 are configured to act on the weight sensor 20.

In addition, a motor (RT motor) 23 is attached to the lower surface of the end portion 18c formed in the right end portion of the first frame 18 in the first frame. The rotating shaft 24 of this motor 23 protrudes upward through the said end 18C. At the protruding end of the rotary shaft 24, the two-stage gear 25 is provided so as to rotate integrally. The two-stage forming gear 25 is composed of a lower gear 26 and an upper gear 27. The lower gear 26 meshes with the first gear 13 of the first rotary shaft 9 and constitutes a third gear. The upper gear 27 is engaged with the second gear 14 of the second rotary shaft 10 and constitutes a fourth gear. In addition, the upper portion of the central portion of the two-stage gear 25 (upper side fourth gear 27) is fitted into the through hole 17c formed in the first frame 17 and is rotatably supported.

In this configuration, when the motor 23 is driven to rotate, the third gear 26 and the fourth gear 27 are rotated so that the first gear 13 and the second gear 14 are driven to rotate. The rotary shaft 9 and the second rotary shaft 10 are configured to be rotationally driven. Here, the outer diameter size (ie, number of gears) of the first gear 13 is configured to be smaller than the outer diameter size (ie, number of gears) of the second gear 14. The outer diameter of the third gear 26 (that is, the number of gears) is configured to be smaller than the outer diameter of the fourth gear 27 (that is, the number of gears). As a result, when the motor 23 is rotated, the rotation speed of the first rotation shaft 9 is doubled, for example, twice the rotation speed of the second rotation shaft 10, in other words, the rotation of the first rotation shaft 9. The number (rotation angle) is configured to be twice the rotation speed (rotation angle) of the second rotation shaft 10.

In the present embodiment, the rotational speed of the first rotational shaft 9 is set to, for example, about 10 rpm, and the rotational speed of the second rotational shaft 10 is set to, for example, about 5 rpm. Moreover, the number of gears of the 1st gear 13 and the number of gears of the 3rd gear 26 are comprised so that it may become the same.

On the other hand, as shown in FIG. 1, the rotating net 6 is detachably attached to the upper end part of the 2nd rotating shaft 10. As shown in FIG. Here, as shown in FIG. 3, the rotating net 6 is formed by performing an enameling process on the surface of a grid-shaped circular steel plate. The rotating net 6 has a circular plate shape as a whole, and as shown in FIG. 1, the flat part 28 and the flange part 29 provided so as to stand upward on the outer peripheral part of the flat part 28. Have A plurality of openings 28a are formed in the flat portion 28. In addition, a through hole 28b is formed at the center of the flat portion 28 to allow the upper end of the first rotation shaft 9 to be inserted therethrough. The inner diameter of the through hole 28b is configured to be smaller than the outer diameter of the second rotary shaft 10 and larger than the outer diameter of the first rotary shaft 9.

Moreover, the cylindrical part 30 is welded to the circumferential edge part of the through hole 28b of the lower surface of the flat part 28 so that it may protrude downward. The inner diameter of the cylindrical portion 30 is configured to be slightly larger than the outer diameter of the second rotating shaft 10, and the upper end of the second rotating shaft 10 is detachably fitted into the cylindrical portion 30. It becomes the structure that I can do. And when fitting the upper end part of the 2nd rotating shaft 10 in the cylindrical part 30, the cylindrical part 30 (namely, the rotating net 6) and the 2nd rotating shaft 10 by the circumferential fixing structure which is not shown in figure. ) Is configured to rotate integrally.

In the outer peripheral surface portion of the flange portion 29 of the rotary net 6, for example, a roller 31 is provided rotatably through the pin 32 as three roller means. These three rollers 31 are arranged at substantially equal intervals. The rotating plate 7 is detachably arranged on the upper side of the rotating net 6. This rotating plate 7 is made of, for example, heat-resistant glass. The lower surface of the rotary plate 7 is formed with a recess 33 engaging with the upper end of the first rotating shaft 9 in the center, and is mounted on the roller 32 of the rotating net 6 in the peripheral edge portion An annular block portion 34 is formed. In this case, when the upper end of the first rotating shaft 9 is fitted into the recess 33 of the rotating plate 7, the rotating plate 7 and the first rotating shaft 9 are integrally formed by a circumferential fixing configuration (not shown). It is supposed to rotate. In addition, since the lower surface annular convex portion 34 of the rotating plate 7 is mounted on the freely rotating roller 32, the rotating plate 7 is configured to be rotatable with respect to the rotating mesh 6. .

Next, the operation of the above configuration will be described. When the motor 23 is rotated, the third gear 26 and the fourth gear 27 are driven to rotate so that the first gear 13 and the second gear 14 meshed with these gears 26 and 27 are driven. Rotationally driven. As a result, the first rotary shaft 9 and the second rotary shaft 10 are rotated so that the rotary plate 7 and the rotary net 6 are rotationally driven. At this time, the rotation speed 10 rpm of the first rotation shaft 9 is twice the rotation speed 5 rpm of the second rotation shaft 10, that is, the rotation speed of the rotation plate 7 is the rotation of the rotation network 6. It is configured to double the speed. Therefore, when the rotary plate 7 and the rotary net 6 start to rotate in the right circumferential direction in the drawing at the position shown in FIG. 3 (a), the rotary plate 7 as shown in FIG. 3 (b) Is rotated half a turn, the mesh 6 is rotated 1/4 turn.

In the above embodiment, the first rotary shaft 9 is rotated by the second rotary shaft 10 when microwaves are supplied from the magnetron into the heating chamber 3 and the stove is heated by heating the food placed on the rotary dish 7. It was set as the structure which rotates the rotating plate 7 at the rotational speed twice the rotational speed of the rotating net 6 by rotating at the rotational speed twice the speed. As a result, the correspondence between the bottom portion of the food on the rotating dish 7 and the lattice-shaped portion of the rotating mesh 6 is displaced according to the rotation, so that microwaves (especially the heating chamber 3) are applied to the entire bottom surface of the food. Microwaves reflected from the bottom of the bottom portion) are uniformly irradiated. As a result, the food can be heated and cooked uniformly, and local concentration of the electric field in the heating chamber 3 can be prevented.

In the case of the above embodiment, the first rotary shaft 9 provided on the inner side of the rotary shaft 8 passes through the rotary network 6 and at the same time the rotary plate 7 is rotated by the first rotary shaft 9. It rotates and was comprised so that the rotation mesh 6 may be rotationally driven by the 2nd rotation shaft 10 provided in the outer side. Thereby, the structure which drives each of the rotating dish 7 and the rotating mesh 6 which overlapped in two steps by the two rotating shafts 9 and 10 arrange | positioned concentrically independently can be implement | achieved easily.

In addition, in the above embodiment, three rollers 31 are installed on the outer circumference of the rotary net 6, and the rotary plate 7 is mounted on the three rollers 31 to the rotary net 6. Since the rotating plate 7 is configured to be rotatable, the structure for freely rotating the rotating plate 7 on the rotating network 6 can be realized with a simple configuration. In this case, since the load (weight of the dish) acting on the rotating dish 7 is configured to act as the rotating mesh 6 through the three rollers 31, the rotating dish 7 is placed on the rotating mesh 6. It can rotate stably.

Further, in the above embodiment, the first gear 13 is installed to be integrally rotated on the first rotation shaft 9, and the second gear 14 is concentrically arranged on the upper side of the first gear 13 at the same time. It is installed to rotate integrally to the rotary shaft 10, and the third gear 26 to be engaged with the first gear 13 is installed to be rotationally driven by the motor 23, and the second gear 14 and the The fourth gear 27 to be engaged is rotatably arranged by the motor 23. Thereby, the structure which rotates the 1st rotation shaft 9 and the 2nd rotation shaft 10 another rotation speed, specifically, the rotation speed of the 1st rotation shaft 9 is set as 2 of the rotation speed of the 2nd rotation shaft 10. FIG. The doubled configuration can be easily realized with a simple configuration.

Meanwhile, in the above embodiment, the first rotary shaft 9 is rotatably supported through the bearings 11 and 12 pressed into the upper and lower ends of the second rotary shaft 10 in a concentric shape, and the second rotary shaft 10 is simultaneously supported. It was set as the structure which rotatably supports to the 1st attachment frame 17 provided in the outer bottom part of the heating chamber 3 through the bearing 19. As shown in FIG. This makes it possible to reliably and easily realize a configuration that allows the first rotary shaft 9 and the second rotary shaft 10 to rotate with each other, while simultaneously rotating the second rotary shaft 10 to the first attachment frame 17. It is possible to reliably and easily realize the structure to be supported.

In the above embodiment, the weight of the food placed on the rotating dish 7 is set on the rotating dish 7, the roller 31, the rotating mesh 6, the second rotating shaft 10, the second gear 14 and the first. The weight sensor 20 which detects through one gear 13 was provided. By such a configuration, the rotating plate 7 and the rotating net 6 can be rotated at different speeds, and the weight of the food on the rotating plate 7 can be accurately detected. In the above embodiment, the third gear 260 and the fourth gear 27 are formed by the two-stage gear 25 integrally molded, and at the same time, the two-stage gear 25 is connected to one motor 23. The number of parts can be reduced, and the structure which rotates the rotating dish 7 and the rotating mesh 6 at a different speed can be implement | achieved with simpler structure.

In addition, although the rotation speed of the 1st rotation shaft 9 was set to 2 times the rotation speed of the 2nd rotation shaft 10 in the said Example, it is not limited to this, You may set to less than 2 times or more than 2 times. In addition, in the above embodiment, the rotational speed of the first rotational shaft 90 is configured to be faster than the rotational speed of the second rotational shaft 10. On the contrary, the rotational speed of the first rotational shaft 9 is the rotational speed of the second rotational shaft 10. It may be configured so as to be later, and more importantly, it may be configured so that the rotation speeds of the two rotation shafts 9 and 10 are different.

In addition, although the three rollers 31 were installed in the rotary net 6 in the said Example, you may install four or more rollers in the rotary net 6. As shown in FIG. Moreover, you may comprise so that the three or more rollers 31 may be provided in the rotation plate 7. On the other hand, the ball may be rotatably accommodated in place of the roller 31 in the ball receiving portion provided in the flange portion 29 of the rotating net 6, and the rotary dish 7 may be placed on the ball. . In this case, it is preferable to comprise so that three or more balls may be rotatably installed in the rotating net 6.

In addition, the roller 31 may be provided so that the lower surface portion of the rotary dish 97 may be directly slidably mounted on the flange portion 29 of the rotary net 6. In this case, what is necessary is just to comprise the upper surface part of the flange part 29 of the rotating net 6, and the lower surface of the rotation plate 7 which contacts this flange part 29 with the member of the material and shape which are easy to slide.

In addition, in the said embodiment, although the structure which rotates the two rotating shafts 9 and 10 by the one motor 23 is set as the structure which rotates the two rotating shafts 9 and 10 by two motors instead of this. good. In addition, although the first gear 13 was integrally molded with the first rotation shaft 9, the first gear 13 of another member was integrally molded with the first rotation shaft 9, but the first gear 13 of the other member was removed. You may comprise so that it may be fixed to one rotating shaft 9 and fixed. In addition, although the 2nd gear 14 and the 2nd rotating shaft 10 were comprised integrally, ie, consisted of one member, you may integrally shape the 2nd gear 14 in the 2nd rotating shaft 10 instead of this, and You may comprise so that the 1st gear 14 of a member may be fixed to the 2nd rotating shaft 10. FIG. In addition, although the 3rd gear 26 and the 4th gear 27 were comprised by one member (two-stage gear 25), you may comprise with two members (two gears).

As will be apparent from the above description, the present invention is configured to rotate the first rotating shaft for driving one of the rotating plates or the rotating mesh and the second rotating shaft for rotating the other of the rotating dish or the rotating mesh at different rotational speeds. Because of this structure, microwaves are uniformly irradiated on the bottom surface of the food placed on the rotating plate, which enables the food to be heated evenly and at the same time, it has an excellent effect of preventing the local concentration of electric field in the heating chamber. Have

Claims (8)

A heating chamber for heating the food by microwaves supplied from the magnetron; A first rotating shaft protruding upward and installed rotatably at an inner bottom portion of the heating chamber; A cylindrical second rotary shaft installed concentrically with the first rotary shaft and rotatably installed; A rotating network driven by the first rotating shaft; And It is disposed on the upper side of the rotating network and provided with a rotating plate rotated by the second rotating shaft, The microwave oven is configured to rotate the first rotational shaft and the second rotational shaft at different rotational speeds. The method of claim 1 While installing the first rotating shaft to penetrate the rotating net and at the same time rotating the rotary plate by the first rotating shaft, And the second rotary shaft is a cylindrical shaft fitted to the outer circumference of the first rotary shaft, and configured to rotate the rotary network by the second rotary shaft. The method of claim 2, The rotating dish is disposed on the rotating mesh, and the outer circumference of the rotating dish is supported on the rotating mesh so as to be relatively rotatable to the rotating dish with respect to the rotating mesh via a sliding portion or roller means to act on the rotating dish. Microwave oven characterized in that the load is configured to act on the rotating network through the sliding portion or roller means. The method of claim 3, A first gear installed to rotate integrally with the first rotation shaft; A second gear installed concentrically on top of the first gear and installed integrally with the second rotation shaft; A third gear installed to be rotatably driven by a motor to mesh with the first gear; And And a fourth gear installed to be rotatably driven by the motor and engaged with the second gear. The method of claim 4, wherein The first rotary shaft is rotatably supported by a bearing pressed into the upper and lower ends in the cylindrical second rotary shaft, And the second rotary shaft is rotatably supported by a bearing on an attachment frame installed at an outer bottom portion of the heating chamber. The method of claim 4, wherein And a weight sensor for detecting the weight of the food placed on the rotating plate through the rotating plate, the roller means, the rotating net, the second rotating shaft, the second gear, and the first gear. The method of claim 4, wherein The third gear and the fourth gear are formed by the two-stage gear formed integrally, Microwave oven characterized in that the two-stage gear is configured to drive rotation by one motor. The method of claim 3, The roller means, the rotating network is a microwave oven, characterized in that consisting of three or more rollers installed on the outer peripheral portion of the rotating plate.