JP3383225B2 - microwave - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a microwave oven having a kneading function.

[0002]

In the conventional microwave oven of this type, a bayonet mechanism is used as a means for fixing the kneading container in the cooking chamber. Since this bayonet mechanism is a system in which a protrusion is fitted in an inclined bayonet groove and the kneading container is fixed by rotating the kneading container, the attaching and detaching operation is troublesome.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a microwave oven in which a kneading container can be easily attached and detached.

[0004]

In order to achieve the above object, a microwave oven according to the present invention is provided with a high frequency generating means for supplying a high frequency into a cooking chamber and a high frequency generating means detachably provided in the cooking chamber. And a rotary net for rotating the food or a container containing the food during heating of the food, and a kneading device that is detachably provided in the cooking chamber instead of the rotary net and is driven by a drive mechanism to knead the food a kneading vessel equipped with a member, provided in the cooking chamber, equipped with a permanent magnet for fixing the kneading container by the magnetic force, of the rotating network, said the permanent magnet portion facing the
It is characterized in that an opening is formed to reduce the magnetic attraction force of the permanent magnet .

In the microwave oven of the present invention having the above means, since the kneading container is fixed by the magnetic force of the permanent magnet, the kneading container can be easily attached and detached. Further, since the rotary net is provided with the opening, it is possible to prevent the problem that the rotary net is difficult to remove due to the magnetic force of the permanent magnets as much as possible.

Further, in the microwave oven of the present invention, a plurality of magnetic poles of the permanent magnet may exist along the circumferential direction, and the magnetic poles may be separated from each other. In addition, a plurality of openings of the rotating net are provided, and a plurality of magnetic poles of the permanent magnet are provided along the circumferential direction, and the number of spokes existing between the openings and the pole along the circumferential direction of the permanent magnet. The number is preferably determined so that one does not become an integral multiple of the other.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIG. 5, the main body 1 of the electromagnetic range is configured by arranging an inner box 3 inside an outer box 2, and the inside of the inner box 3 is a cooking chamber 4. Also,
A space between the outer box 2 and the inner box 3 is a machine room 5, and a magnetron 6 as a high frequency generator is arranged in the machine room 5. The high frequency emitted by the oscillating operation of the magnetron 6 is supplied into the cooking chamber 4 through the waveguide 7. Further, in the microwave oven of this embodiment, in addition to high-frequency heating cooking, a well-known method for supplying hot air to the back portion of the inner box 3 into the cooking chamber 4 in order to be able to perform oven cooking A hot air generator (not shown) is provided.

The microwave oven has a kneading function, and a kneading container 8 is detachably arranged in the cooking chamber 4 when kneading food. At the outer bottom of this kneading container 8,
A base 9 made of a non-magnetic material such as plastic or aluminum is attached, and as shown in FIG. 3, a blade shaft 10 is rotatably supported on the base 9. The upper end of the blade shaft 10 projects into the kneading container 8, and a kneading blade 11 as a kneading member is detachably attached to the upper end of the blade shaft 10.

The kneading vessel 8 is fixed in the cooking chamber 4 by magnetic force. A permanent magnet 12 for fixing the magnet is provided on the bottom of the inner box 3. The permanent magnet 12 is annular and is attached so that a pair of S and N poles are vertically arranged, and as shown in FIG. 4, a plurality of S and N poles alternately appear in the circumferential direction. It is magnetized. And
The annular permanent magnet 12 is housed in a yoke 13 formed in an annular shape by a magnetic material such as an iron plate. The cross-sectional shape of each part of the yoke 13 is substantially U-shaped.

The yoke 13 which houses the permanent magnet 12 is further housed in an outer case 14 made of a non-magnetic material such as plastic. The outer case 14 is formed so that the cross-sectional shape of each part is substantially U-shaped, and has a form that closes the open upper surface of the yoke 13. A flange 15 for mounting is integrally formed on the outer peripheral portion of the lower end of the outer case 14. The outer case 14 is fitted into a circular mounting hole 16 formed in the bottom surface of the inner box 3 so as to project into the cooking chamber 4 by being inserted from below, and the flange 1
5 is fixed to the bottom surface of the inner box 3 by screwing or the like.

On the other hand, on the side of the kneading container 8, the base portion 9 is formed in a cylindrical shape whose lower surface is open, and inside the base portion 9 is located slightly above the lower end of the base portion 9. A ring-shaped suction plate 1 as a member to be positioned and made of an iron plate or the like.
7 is provided. Then, the base portion 9 is attached to the outer case 14
When it is set in the cooking chamber 4 so as to be fitted to the outside of the, the attraction plate 17 is attracted by the magnetic force of the permanent magnet 12, and the kneading container 8 is thereby fixed in the cooking chamber 4. There is. At this time, since the permanent magnet 12 is covered with the annular yoke 13 having an open top, the leakage of the magnetic flux of the permanent magnet 12 is reduced, and the attraction plate 17 can be attracted more strongly.

[0012] kneading container 8 is fixed to the cooking chamber 4 as described above, the mixing blade 1 1 is rotated by a kneading mechanism 18. In the kneading mechanism 18, the kneading motor 19 which is the drive source thereof is attached to a mounting plate 20 fixed to the outer bottom portion of the inner box 3. Also, the mounting plate 2
0, the driven pulley 21 has the mounting hole 1 at the bottom of the inner box 3.
6 is rotatably provided in the vicinity of 6, and the driven pulley 21 is connected via a belt 24 to a drive pulley 23 attached to a rotary shaft 22 of a kneading motor 19.

The driven pulley 21 integrally has a gear 25, and the gear 25 is rotatably supported by a mounting plate 20 so as to be substantially concentric with the mounting hole 16 and an output gear 26.
Meshes with. A cylindrical portion 27 is integrally provided on the upper surface of the output gear 32 so as to project upward.
Engaging teeth 28 are intermittently provided on the upper end of 7. On the other hand, a cylindrical portion 29 is integrally provided on the lower end portion of the blade shaft 10 so as to project downward, and the lower end portion of the cylindrical portion 29 engages with the engaging tooth 28 of the output gear 26. 30 is provided intermittently. The rotation of the output gear 26 is transmitted to the blade shaft 10 by the engagement of the engagement teeth 28 and 30.

At the time of high-frequency heating by the magnetron 6, the kneading container 8 is replaced by the rotary net 31 shown in FIGS. 1 and 2 in the cooking chamber 4. A rotary plate (not shown) is placed on the rotary net 31, and food to be subjected to high frequency heating or a container containing the food is placed on the rotary plate. And
The rotation of the rotary net 31 prevents the food from being rotated and uneven heating.

A net motor 32 for driving the rotary net 31 is attached to the mounting plate 20 via a support plate 33. The mesh motor 32 is attached to the mounting hole 16 of the inner box 3.
It is arranged at a position substantially concentric with
4 is inserted through an insertion hole 35 formed at the center of the output gear 26 and projects from the cylindrical portion 27 into the cooking chamber 4. The rotary net 31 is detachably attached by fitting the central boss portion 36 to the upper end portion of the rotary shaft 34. In this case, the upper end portion of the rotating shaft 34 is formed into a non-circular, for example, triangular convex portion 37, and correspondingly, the triangular concave portion 3 is provided below the upper end surface portion of the boss portion 36 of the rotary net 31.
8 is formed. Then, the recess 38 and the rotating shaft 3
The rotation of the rotary shaft 34 is transmitted to the rotary net 31 by fitting with the triangular convex portion 37 of No. 4.

The rotary net 31 is formed of a strong iron plate for carrying a heavy rotary plate or food. The rotary net 31 has a disk portion 31a at the center thereof, and a relatively large opening 39 is formed on the outer peripheral side thereof. When the rotary net 31 is further attached to the rotary shaft 34,
The disk portion 31 that is a portion facing the permanent magnet 12
A plurality of openings 40, for example, three openings 40 are formed in a. In this case, the number of the openings 40 is set so that one of the number of the spokes 41 existing between the openings 40 and the number of poles along the circumferential direction of the permanent magnet 12 does not become an integral multiple of the other. It is set.

Next, the operation of the above configuration will be described. Now, as shown in FIG. 1, in the cooking chamber 4, a rotary net 31 attached to a rotary shaft 34 is arranged, and a rotary plate (not shown) is placed on the rotary net 31. To do. In order to perform high frequency heating in this state, the food to be cooked or a container containing the food is placed on a rotating dish. Then, when the cooking operation by the high frequency heating is started, the magnetron 6 is driven to radiate the high frequency, and the net motor 32 is activated to rotate the rotary net 31. The high frequency wave radiated from the magnetron 6 is guided into the cooking chamber 4 by the waveguide 7 and is evenly applied to the rotating food to heat the food.

During the high frequency heating, the spoke portions 41 of the rotary net 31 rotate on the permanent magnets 12, so that the spoke portions 41 move from the north pole to the south pole and from the south pole to the north pole of the permanent magnet 12. Each time, it receives suction force and loses the smoothness of rotation. In this case, the number of spokes 41 and the number of magnetic poles along the circumferential direction of the permanent magnet 12 are set so that one does not become an integral multiple of the other, so two or more spokes 4 are provided.
Since 1 does not pass over the magnetic pole in the same state, the influence of the attractive force of the permanent magnet 12 can be minimized, and the smoothness of rotation of the rotary net 31 can be prevented as much as possible.

When kneading and cooking, for example, kneading steamed glutinous rice to make rice cake, the kneading blade 1 is attached to the blade shaft 10.
1 is attached, and the steamed glutinous rice is accommodated in the kneading container 8 thereon. Then, a rotary plate (not shown)
Then, the rotary net 31 is pulled out from the rotary shaft 34. At this time, the rotary net 31 receives the magnetic attraction force of the permanent magnet 12, but the disk portion 31 a facing the permanent magnet 12 is formed.
Since the opening 40 is provided in the disk and the area of the disk portion 31a is made small, the magnetic attraction force that the rotary net 31 receives from the permanent magnets 12 can be minimized, and the rotary net 31 can be rotated. It is easy to remove from 34.

After taking out the rotary net 31 from the cooking chamber 4,
The kneading container 8 is put in the cooking chamber 4 and the base 9 thereof is set so as to be fitted to the outside of the outer case 14 of the permanent magnet 12. Then, the engaging teeth 30 of the blade shaft 10 and the engaging teeth 28 of the output gear 26 mesh with each other, and the suction plate 17
Are attracted by the magnetic force of the permanent magnet 12. As a result, the lower end of the base portion 9 is pressed against the inner bottom portion of the cooking chamber 4 (inner box 3), and the kneading container 8 is fixed to the cooking chamber 4. In this case, the base 9 contacts the inner bottom of the cooking chamber 4 and the suction plate 17
Is also preferably configured to be in contact with the outer case 14 of the permanent magnet 12, but even when the attraction plate 17 floats from the outer case 14 when the base 9 contacts the inner bottom of the cooking chamber 4,
Alternatively, when the suction plate 17 contacts the outer case 14, it does not matter if the base portion 9 floats from the inner bottom portion of the cooking chamber 4.

After fixing the kneading vessel 8 in the cooking chamber 4, the kneading operation is started. Then, the kneading motor 19 is activated, and its rotation is driven by the driven pulley 21 via the belt 24.
The rotation of the driven pulley 21 is transmitted from the gear 25 to the output gear 26, and the rotation of the output gear 26 is further transmitted to the blade shaft 10 via the engaging teeth 28 and 30 to transmit the kneading blade 11 Rotates. And this kneading blade 1
By the rotation of 1, the glutinous rice in the kneading container 8 is kneaded to produce a rice cake. After finishing the production of rice cake, kneading container 8
Is pulled out to remove the attraction plate 17 from the attraction of the permanent magnet 12 and taken out from the cooking chamber 4.

FIG. 6 shows another embodiment of the present invention. This is a configuration in which a plurality of permanent magnets 42 are provided with a plurality of magnetized portions 42a composed of a pair of upper and lower S poles and N poles in the circumferential direction with a non-magnetized portion 42b interposed therebetween. By using the permanent magnets 42 configured in this way, the magnetic attraction force that the spoke portions 41 of the rotary net 31 receive from the permanent magnets 42 can be reduced, and the rotary net 31 can be rotated more smoothly.

The present invention is not limited to the embodiment described above and shown in the drawings, but may be modified or expanded as follows. The permanent magnet 12 may be composed of a plurality of permanent magnets. Further, the permanent magnet 42 may be configured by joining a plurality of permanent magnets through a spacer made of a non-magnetic material. The permanent magnet is not limited to the annular one.

[0024]

As described above, according to the present invention, since the kneading container is fixed by the magnetic force of the permanent magnet, the kneading container can be easily attached and detached, and the rotary net has an opening. Since it is provided, it is possible to prevent the problem that the rotating net is difficult to remove due to the magnetic force of the permanent magnets as much as possible.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a plan view of a rotary net.

FIG. 3 is a vertical sectional view showing a state in which a kneading container is attached.

FIG. 4 is a plan view of a permanent magnet.

[FIG. 5] Overall vertical sectional front view

FIG. 6 is a view corresponding to FIG. 4 showing another embodiment of the present invention.

[Explanation of symbols]

In the figure, 4 is a cooking chamber, 6 is a magnetron (high-frequency generator), 8 is a kneading vessel, 9 is a base, 11 is a kneading blade (kneading member), 12 is a permanent magnet, 13 is a yoke, and 17 is an adsorption plate. , 18 is a kneading mechanism, 31 is a rotary net, 32 is a net motor, 40 is an opening, 41 is a spoke, and 42 is a permanent magnet.

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F24C 7/02 340 F24C 7/02 551 A47J 37/00 301 A47J 43/04 F24C 15/18

Claims (3)

(57) [Claims] 1. A high-frequency generating means for supplying a high-frequency wave to a cooking chamber, and a rotating net which is detachably provided in the cooking chamber and rotates the food or a container containing the food when the food is heated by the high-frequency generating means. And a kneading container provided in the cooking chamber in place of the rotary net and provided with a kneading member for kneading food by being driven by a drive mechanism, and the kneading container provided in the cooking chamber, ; and a permanent magnet fixed by magnetic force, of the rotating network, wherein the permanent magnet portion facing the front
A microwave oven characterized in that an opening is formed to reduce the magnetic attraction force of the permanent magnet . 2. The microwave oven according to claim 1, wherein a plurality of magnetic poles of the permanent magnet are present along the circumferential direction, and the magnetic poles are separated from each other. 3. The rotary net is provided with a plurality of openings, and the permanent magnet has a plurality of magnetic poles along the circumferential direction, and the number of spokes existing between the openings and the permanent magnet. 3. The microwave oven according to claim 1 or 2, wherein the number of poles along the circumferential direction is defined such that one does not become an integral multiple of the other.