JP3315891B2 - Heating vessel with lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating container with a lid, such as a rice cooker or an electric pot, having a lid attached to a heating container body.

[0002]

2. Description of the Related Art When an auxiliary heater or a display device is provided on a lid of a rice cooker or an electric pot, a lead wire is generally passed through a hinge portion of the lid in order to connect to a power supply on the side of the heating container body. . However, such a structure has a disadvantage that the lid cannot be removed freely due to the presence of the lead wire.

For this reason, a primary side of a transformer is provided on the heating vessel main body side, a secondary side of the transformer is provided on the lid side, and the two sides are electromagnetically coupled to each other so that required electric power is supplied from the primary side to the secondary side. It is known to employ a transformer system for transmitting the power to a computer (Japanese Patent Laid-Open No. 5-68635).

In the above-mentioned transformer system, both ends of the iron core of the primary coil on the container body side are exposed to the outside, and the exposed end portions of the iron core are inserted into holes of bobbins of a pair of secondary coils provided on the lid side. It can be inserted and removed freely. Also, in contrast to the above, the iron core of the secondary coil on the lid side is exposed to the outside, and the exposed end of the iron core may be freely inserted and removed into the hole of the bobbin of the primary coil provided on the container body side. is there.

[0005]

Since the above-mentioned iron core is formed of a relatively fragile material such as ferrite, there is a disadvantage that the exposed portion is easily cracked or chipped. In order to solve such a drawback, it is conceivable to apply a resin coat to the exposed portion of the iron core, but the gap between the coil inserted into the exposed portion and the iron core is increased by the thickness of the resin coat. Therefore, there is a problem that power transmission efficiency is reduced.

Accordingly, an object of the present invention is to provide a heating vessel with a lid having a transformer-type power transmission means having a structure in which an iron core is not exposed to the outside and cracks and chipping of the iron core are less likely to occur. And

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned object, according to the present invention, a lid is attached to a container body by a hinge so as to be openable and closable. The opposing walls with the lid-side storage part are brought into contact with or approaching to each other, and the primary side of the transformer composed of the primary coil and the iron core connected to the power supply is stored in the main body-side storage part, and the lid-side storage part is A transformer secondary side comprising a secondary coil and its iron core connected to a load is housed, and both end surfaces of the iron cores on the transformer primary side and the transformer secondary side are interposed through the respective opposing walls. To face each other.

[0008] The main body-side storage part and the lid-side storage part are provided close to the hinge part of the lid, and at least the contact portions of the opposing walls at both ends of each iron core are made of rubber. can do.

In the case where the opposing wall portion is made of rubber, one end of a lid urging coil spring wound around the rotation shaft of the hinge is engaged with one end of a lever attached to a part of the container body. At the same time, the other end of the lever is engaged with the transformer primary side, and when the lid is closed, the spring force of the coil spring is exerted on the transformer primary side via the lever to compress the rubber. Is adopted, when the lid is closed, the rubber is compressed and the gap between both iron cores is reduced.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The illustrated embodiment is a rice cooker, in which a lid 3 is attached to a container body 1 by a hinge part 2 so as to be openable and closable, as shown in FIG. An inner pot 4 is detachably housed inside the container body 1 and a lid 3 is provided.
A lid heater 5 for preventing the occurrence of dew at the time of heat retention is attached to the inside.

[0011] As shown in FIG.
At the rear end portion of the container body 1, a pair of hinge shafts 6 rotatably mounted at predetermined intervals on the left and right sides, and disengagement arms 7, which are fixed to opposed inner ends of both hinge shafts 6, respectively.
And a coil spring 8 for urging the lid mounted between the outer ends of the hinge shafts 6. The above coil spring 8
Fits the coil portions 9 provided at both ends around the hinge shafts 6 and engages the ends of the coil portions 9 with the boss portions 11 integral with the hinge shaft 6 (see FIG. 3). The upwardly U-shaped engaging arm 12 between the two coil portions 9 is connected to the container body 1.
Pressed against a part of

On the other hand, a pair of engagement recesses 13 opened rearward are provided at the rear end of the lid 3 so as to face the engagement / disengagement arm 7. Is inserted into the arm 7 for engagement and disengagement, the lid 3 is removably attached to the container body 1, and when the lid 3 is opened, the coil portion 9 of the coil spring 8 is reduced in diameter. It exerts a biasing force in the closing direction.

Below the intermediate portion of the container body 1 where the engaging / disengaging arms 7 and 7 face each other, there is provided a main body-side storage portion 15 of the transformer primary side 14, and opposed thereto, the lid 3 has a transformer secondary side. Sixteen lid-side storage portions 17 are provided.

The upper surface of the main body side storage section 15 and the lid side storage section 1
7, as shown in FIG.
8, 18 'are provided. Opposite wall 1 of body side storage unit 15
A partition wall 19 is provided inside the lower surface of 8, and a transformer primary side 14 is mounted on a support 21 provided on the partition wall 19.

As shown in FIGS. 2 to 4, the portion of the main body side storage portion 15 and the coil portion 9 of the hinge portion 2 where the coil portion 9 is stored has a common space.
2 cover.

As shown in FIG. 2, the lid-side storage part 17 is a part in which the upper and rear surfaces of the open space are covered by a cover lid 20, and the transformer secondary side 16 is provided in the storage part. 17 is fixed to the opposing wall 18 'by bonding or fitting.

The above-mentioned transformer primary side 14 and transformer secondary side 1
6 are E-shaped (or U-shaped) as shown in FIG.
And a primary coil 25 and a secondary coil 26 are wound around the iron cores 23 and 24, respectively.
8 and 18 'are opposed to each other. With the lid 3 closed, the opposing walls 18, 18 'contact each other or oppose each other with a slight gap.

Although not shown, the primary coil 25 is connected to a commercial power supply directly or via an inverter. The inverter functions to convert the frequency of the commercial power supply to a high frequency (for example, 25 kHz). The use of a high frequency makes it possible to reduce the size of the primary coil 25 and the secondary coil 26. The lid heater 5 is connected to the load side of the secondary coil 26.

The rice cooker of the embodiment is as described above. With the lid 3 closed, the iron cores 23, 24 of the transformer primary side 14 and the transformer secondary side 16 are opposed to the opposing walls 18, 1 respectively.
8 ′, and opposes vertically with a gap of a size obtained by adding a gap between them in some cases. Opposing walls 18, 1
8 'is a plastic such as polypropylene, which is formed as thin as possible. The above gap is the primary side 1 of the transformer.
By providing the secondary side 4 and the secondary side 16 at a position relatively close to the axis of the hinge shaft 6, variation among products is reduced.

When the power of the rice cooker is turned on, the current flowing through the primary coil 25 generates a magnetic flux, and the magnetic flux is transmitted to the iron core 24 of the transformer secondary side 16 through the iron core 23 and the opposing walls 18, 18 '. The flow interlinks with the secondary coil 26 to generate an induced electromotive force, and a secondary current flows through the lid heater 5.

The opposing walls 18 and 18 ′ are connected to both iron cores 2.
A gap is formed between the first and second opposed walls 18 and 1 to indicate that power is sufficiently transmitted even if such a gap is present.
Experiments were conducted on the gap between the iron cores 23 and 24, the output [W], and the efficiency [%] according to the 8 'thickness, and the results are shown in Table 1. The frequency of the power supply in this experiment was 25 kHz.

[0022]

[Table 1]

The iron cores 23, 2 of the opposing walls 18, 18 'described above.
4A, a rubber 27 is fitted to a portion where the end face of the opposite wall 18 contacts, or as shown in FIG.
By forming the entire portion 8 'with the rubbers 27, 27, cracks or chipping of the iron cores 23, 24 due to vibration or the like can be more reliably prevented.

Next, in the second embodiment shown in FIG. 7, when the opposing walls 18, 18 'are formed by the rubbers 27, 27 as described above, the primary side 14 of the transformer is It is mounted movably, and the lever 29 is
1 and swingably mounted on the support base 21.
One end of the lever 29 is faced, and the primary side 14 of the transformer is pushed up by the action of the lever 29 to compress the rubbers 27, 27 to reduce the gap between the two iron cores 23, 24.

The force for operating the lever 29 is provided by the coil spring 8. That is, the engagement arm 12 of the coil spring 8 is engaged with the inside of the other end of the lever 29. Then, when the lid 3 is closed, the engaging arm 12 of the coil spring 8 moves outward (see the solid line in FIG. 7), so that the tip of the lever 29 pushes up the lower end of the transformer primary side 14 and the rubber 27, 27 is compressed. Conversely, when the lid 3 is opened, the engaging arm 12 of the coil spring 8 tilts inward as indicated by the two-dot chain line, so that the spring force is not applied to the lever 29 and the compression action on the rubbers 27, 27 is lost (see FIG. See dash-double-dot line).

[0026]

As described above, according to the present invention, the primary side and the secondary side of the transformer are respectively housed in the main body side storage part and the lid side storage part, and both end surfaces of both iron cores are respectively stored in these storage parts. By opposing each other via the opposing wall, the iron core is not exposed to the outside, and cracking and chipping can be prevented (claim 1).

In addition, by providing the main body side storage portion and the lid side storage portion close to the hinge portion of the lid, the influence of the size of the gap between the opposing surfaces of the iron core and the variation in the spring force of the coil spring. And the secondary output is stabilized (claim 2).

Further, by forming part or all of the opposing wall opposing the iron core with rubber, it is possible to further reduce the impact on both ends of the iron core (claim 3). When the rubber is compressed by using the spring force of a coil spring for use, the gap between the iron core end faces is further reduced, and the power transmission efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment.

FIG. 2 is a partially exploded perspective sectional view of the above.

FIG. 3 is an exploded perspective view of the hinge part according to the first embodiment.

FIG. 4A is a cross-sectional view of a hinge part of the same; FIG. 4B is a cross-sectional view taken along line bb in FIG.

FIG. 5 is a sectional view of a hinge part of the above.

6A is a partial cross-sectional view of a modification of the above embodiment; FIG. 6B is a partial cross-sectional view of another modification of the above embodiment;

FIG. 7 is a cross-sectional view of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Hinge part 3 Lid 4 Inner pan 5 Lid heater 6 Hinge axis 7 Disengagement arm 8 Coil spring 9 Coil part 11 Boss part 12 Engagement arm 13 Engagement recess 14 Transformer primary side 15 Body side storage part Reference Signs List 16 transformer secondary side 17 lid side storage section 18, 18 'opposing wall 19 partition wall 20 cover lid 21 support base 22 cover lid 23 iron core 24 iron core 25 primary coil 26 secondary coil 27 rubber 28 hole 29 lever

────────────────────────────────────────────────── (5) References JP-A-5-68635 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47J 27/21 101 A47J 27/00 103 H05B 6/00-6/44

Claims (4)

(57) [Claims] 1. A lid is attached to a container body so as to be openable and closable by a hinge portion, and respective opposing walls of a main body side storage part provided in the main body and a lid side storage part provided in the lid are brought into contact with or close to each other,
A transformer primary comprising a primary coil connected to a power supply and its iron core is housed in the main body side housing portion, and a secondary coil connected to a load in the lid side housing portion and its iron core are housed. A heating vessel with a lid that houses a transformer secondary side and that has both end faces of each of the iron cores of the transformer primary side and the transformer secondary side facing each other via the opposed walls. 2. The heating container with a lid according to claim 1, wherein the main body side storage part and the lid side storage part are provided close to a hinge part of the lid. 3. The heating container with a lid according to claim 1, wherein at least a contact portion of each of the opposed walls at both end surfaces of each iron core is formed of rubber. 4. An end of a lid biasing coil spring wound around a rotation shaft of the hinge is engaged with one end of a lever attached to a part of the container body, and the other end of the lever is connected to a transformer primary side. 4. The heating container with a lid according to claim 3, wherein the lid is closed to apply the spring force of the coil spring to the primary side of the transformer via the lever when the lid is closed to compress the rubber.