JP3489575B2 - Electric rice cooker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work coil installation structure for an electromagnetic induction heating type electric rice cooker.

[0002]

2. Description of the Related Art Generally, in an electromagnetic induction heating type electric rice cooker, a work coil corresponding to at least the bottom wall of the inner pot is provided through a protective frame (inner case) provided corresponding to the inner pot. The electromagnetic induction effect of the coil induces an eddy current in the inner pot through the protective frame, causing the inner pot to generate heat and cook rice.

FIG. 8 shows a general work coil installation structure for a protective frame of such an electric rice cooker.

[0006] FIG. 8 is a first view for heating a protective frame 1 for accommodating an inner pot through an upper opening 1 a, the bottom wall side face and the side wall side face from the center of the bottom face of the inner pot. ~ Third plural sets of work coils 2, 3, 4, coil bases (mounting plate and magnet core case) 5 for supporting these first to third work coils 2, 3, 4; Each of the magnet core members 6, 6 ... for converging the magnetic flux from the work coils 2, 3, 4 in the direction of the protective frame (inner pot) is shown exploded in the vertical direction. The work coils 2, 3 and 4 each have a plurality of litz wires with a predetermined width so as to correspond to the respective surface shapes of the central portion, the side surface portion and the side surface portion of the side wall 1b of the bottom wall portion 1c of the protection frame 1. It is configured by winding in a strip shape.

The respective corresponding surfaces are arranged so as to be in direct contact with each other by being fitted from the lower side, and are supported on the coil base 5 via a plurality of magnet core members 6, 6 ... It is supposed to be done.

Reference numerals 2a, 3a, and 4a in the drawing are connection terminals for connecting the first to third work coils 2, 3, and 4 to the power source side.

By the way, as described above, when the first to third work coils 2, 3 and 4 are attached to the protective frame 1, when the inner pot is heated, the protective frame 1 is stored inside. While the work coils 2, 3, 4 themselves become hot due to the heat from the pan, the Joule heat also causes the work coils 2, 3 and 4 to self-heat and the temperature rises.
It is desirable that a predetermined gap be provided between them without directly contacting them.

From such a viewpoint, for example, a plurality of ribs having a predetermined height extending in the radial direction are integrally formed on the outer peripheral surface corresponding to the work coil of the protective frame as described above, and the ribs are interposed therebetween. In some cases, a predetermined gap is formed between the protective frame and the work coil (Japanese Patent Publication No. 8-1
No. 0625).

With such a structure, the mutual contact area between the bottom of the protective frame and the work coil is reduced, and as a result, the heat generated by the self-heating of the work coil is less likely to be transmitted to the bottom of the protective frame. In addition, since the surface area of the bottom of the protective frame is increased by the ribs, although a little, the cooling effect by heat radiation is enhanced, and the temperature rise of the bottom of the protective frame is correspondingly reduced. Therefore, the protective frame can be made of an inexpensive synthetic resin material having poor heat resistance other than heat resistant plastic such as fluorine-based plastic.

Further, the work coil also has a smaller contact area with the protective frame and a larger area in contact with air, so that the cooling effect due to heat dissipation is enhanced, and the conduction heat from the heated inner pot is also increased. Since the contact area with the bottom of the protective frame is small, it is more difficult to transmit. As a result, the temperature rise of the work coil is reduced and the durability is further improved.

[0011]

However, when a plurality of ribs are integrally formed on the outer peripheral surface of the protective frame itself as described above, the following problems occur.

(1) A "shrink" occurs at the position of the inner peripheral surface of the protective frame on the side opposite to the ribs, and the appearance becomes poor.

(2) The protective frame itself is deformed by distortion, and the work coil cannot be fixed in a uniform abutting relationship over the entire circumference.

The present invention has been made to solve such a problem, and an object thereof is to provide an electric rice cooker capable of realizing a gap without forming a rib on the outer peripheral surface of a protective frame. To do.

[0015]

In order to achieve the object, the present invention comprises the following means for solving the problems.

(1) Invention of Claim 1 The electric rice cooker of the present invention corresponds to a protective frame in the outer case for accommodating the inner pot and an inner pot accommodated in the protective frame. In an electric rice cooker comprising a work coil provided on the outer peripheral side of the protection frame and a coil base on the outer peripheral side of the work coil for supporting the work coil, the work coil has a predetermined thickness. The work coil binding member is bound at a plurality of positions, and the binding member is provided with a predetermined gap between the work coil binding member and the protection frame.

With this structure, the work coil is fixed to the outer peripheral surface of the protective frame with a predetermined gap through the binding member having a thickness not less than the predetermined value. Therefore, the mutual contact area between the outer peripheral surface of the protective frame and the work coil is very small, and as a result, heat due to self-heating of the work coil is less likely to be transferred to the protective frame. Also,
Similarly, since the effective heat dissipation area of the outer peripheral surface of the protective frame is widened and the cooling effect by heat dissipation is enhanced, the temperature rise of the protective frame is correspondingly reduced. Therefore, the protective frame can be made of an inexpensive synthetic resin material having poor heat resistance other than heat resistant plastic such as fluorine-based plastic.

On the other hand, the work coil also has a smaller contact area with the protective frame and a larger area in contact with air, so that the cooling effect due to heat dissipation is enhanced, and the conduction from the heated inner pot is increased. Since the contact area with the protective frame is also small, heat is less likely to be transmitted. As a result, the temperature rise of the work coil is reduced and the durability is further improved.

Moreover, since the formation of the gap is realized at the same time by the binding member originally necessary for the work coil, there is almost no increase in cost. Further, unlike the case where the rib is integrally formed on the protective frame itself, the above-mentioned conventional problems do not occur at all.

(2) Invention of Claim 2 In the electric rice cooker of this invention, in the configuration of the invention of claim 1, a plurality of magnet core members are provided in the coil base in a radial direction, and The member is provided at a position corresponding to the magnet core member.

Therefore, in this structure, the binding member is supported and fixed in a more stable state by the magnet core member.

(3) Invention of Claim 3 In the electric rice cooker of the present invention, in the configuration of the invention of claim 1 or 2, between the binding member and the protective frame,
It is characterized in that a work coil contact member is provided which allows the work coil bundling portion to contact the outer peripheral surface of the protective frame uniformly over the entire surface.

Therefore, in this structure, the work coil contact member uniformly adheres and fixes the work coil over the entire circumference of the protective frame, thereby exhibiting a more stable and highly efficient electromagnetic induction action. Will be able to do it.

(4) Invention of Claim 4 In the electric rice cooker of this invention, in the construction of the invention of claim 3, the surface of the work coil contact member that abuts against the protective frame has an adhesive function. It is characterized by being formed.

Therefore, in this structure, the work coil contact member is positively joined and held to the outer peripheral surface of the protective frame by the adhesive function of the contact surface, and therefore the work coil close contact holding performance is also improved. Further improve.

(5) Invention of Claim 5 The electric rice cooker of this invention is the same as Claim 1, 2, 3 or 4 above.
In the configuration of the invention described above, the binding member is formed of a strip-shaped taping member, and the taping member is wound a predetermined number of times or more to form a plurality of work coils so that a thickness capable of forming a predetermined gap is obtained. It is characterized by being united.

Therefore, in this structure, the plurality of litz wires of the work coil are reliably taped and bound by the taping member, and depending on the thickness of the overlapping portion of the taping member that is wound a predetermined number of times or more. A gap having a predetermined size is appropriately formed between the protective frame and the protective frame.

(6) Invention of Claim 6 In the electric rice cooker of this invention, in the configuration of the invention of claim 1, the binding member is a clip member for detachably clipping a plurality of litz wires. It is characterized by that.

Therefore, in this structure, the plurality of litz wires of the work coil are securely clipped by the clip member to be bound together, and the thickness of the clip member allows the predetermined litz wire to be appropriately spaced from the protective frame. Gaps are formed.

(7) Invention of claim 7 In the electric rice cooker of this invention, in the structure of the invention of claim 6, the contact surface of the clip member with the protective frame has a projection of a predetermined thickness. It is characterized in that a section is provided.

Therefore, in this structure, the convex portion having a predetermined thickness provided on the contact surface with the protective frame provides a predetermined gap between the protective frame and the protective frame according to the thickness of the convex portion. Is formed.

(8) The invention according to claim 8 The electric rice cooker of the present invention is configured so as to correspond to a protective frame in the outer case for accommodating the inner pot and an inner pot accommodated in the protective frame. In an electric rice cooker comprising a work coil provided on the outer peripheral side of the protective frame and a coil base on the outer peripheral side of the work coil for supporting the work coil, a plurality of inner rice cookers are provided on the inner surface of the protective frame. While a concave groove extending vertically is provided, the groove of the concave stripe forms a plurality of convex stripes on the outer peripheral surface, and the convex stripes form a predetermined gap between the work coil and the protective frame. The feature is that a gap is formed.

According to this structure, the work coil has a predetermined gap on the outer peripheral surface of the protective frame by the convex groove formed on the opposite surface side by the concave groove on the inner surface side of the protective frame. It will be fixed. Therefore, the mutual contact area between the bottom of the protective frame and the work coil is reduced, and as a result, the heat generated by the self-heating of the work coil is less likely to be transferred to the protective frame. Further, since the heat dissipation area of the protective frame is widened due to the reduction of the contact area, the cooling effect due to the heat dissipation is enhanced, and the temperature rise of the protective frame is correspondingly reduced. Therefore, the protective frame can be made of an inexpensive synthetic resin material having poor heat resistance other than heat resistant plastic such as fluorine-based plastic.

Further, the work coil also has a smaller contact area with the protective frame and a larger area in contact with air as described above, so that the cooling effect due to heat dissipation is enhanced, and the heated inner pot Since the contact area with the protective frame is also small, the conduction heat of is less likely to be transmitted. As a result, the temperature rise of the work coil is reduced and the durability is further improved.

Moreover, unlike the case where the rib is integrally formed on the protective frame itself, the above-mentioned conventional problems do not occur at all.

Furthermore, the grooved groove also functions as a storage groove for rice grains, cappen, etc., which have entered the inside of the protective frame, so that the inner pot stored inside is properly brought into contact with the bottom surface of the protective frame. You can hold it. As a result, the electromagnetic induction distance between the inner pot and the work coil can be optimally maintained, and the electromagnetic induction efficiency can be improved.

On the other hand, for that purpose, for example, in the inner pot, the flange width of the opening is enlarged, and the inner pot is hung at the opening end of the protective frame to provide a gap with the bottom of the protective frame. It is not necessary to adopt a stop structure.

[0038]

As a result of the above, according to the electric rice cooker of the present invention, it is possible to solve the conventional problems and provide an inexpensive electric rice cooker having a protective frame that looks good. .

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIGS. 1 and 2
FIG. 3 shows the configuration of the electric rice cooker according to Embodiment 1 of the present invention.

1 and 2 show the work coil installation structure with respect to the protective frame of the electric rice cooker by disassembling the respective parts for easy understanding.

First, FIG. 1 therein shows a cylindrical protective frame 1 having a bottom, which is made of synthetic resin and accommodates an inner pot downward from the opening 1a side, a central surface of a bottom wall portion of the inner pot, and the same. First to third sets of work coils 2, 3 and 4 for heating each of the side surface of the bottom wall of the pan and the side surface of the side wall of the pan, and the first to third work coils 2, 3 Coil base (mounting plate and magnet core mounting member) 5 for supporting 4, and the above first to third
Protecting the magnetic flux from the work coils 2, 3 and 4 (inner pot)
Each of the magnet core members 6, 6 ... that are converged in the direction is shown in an exploded manner in the vertical direction. Then, the first to the above
Each of the third work coils 2, 3 and 4 includes a plurality of litz wires 2b, 2b ... 3b, 3b ... 4b,
4b ... is the central portion of the bottom surface of the bottom wall portion 1c of the protective frame 1,
The side surface portion and the side wall portion 1b of the protective frame 1 are formed in a band shape with a predetermined width so as to correspond to the respective surface shapes of the side surface portion.

In the case of this embodiment, the first
~ The third work coils 2, 3 and 4 are arranged so as to indirectly contact with the corresponding surfaces with a predetermined gap therebetween,
A plurality of magnet core members 6 are provided on the coil base 5.
It is designed to be supported and fixed via 6 ... In addition, the magnet core members 6, 6 ...
are formed by inserting and fixing magnet cores (ferrite cores) 6a, 6a.

As already mentioned, the first to
The third work coils 2, 3 and 4 are connected to the protective frame 1 as described above.
When attaching to the above, when the first to third work coils 2, 3 and 4 are energized to heat the inner pot, the protection frame 1 receives heat from the inner pot and becomes high temperature. On the other hand, the first to third work coils 2, 3, 4 themselves also self-heat due to Joule heat and become considerably high in temperature. Therefore, the protective frame 1 and the first to third work coils 2, 3 and 4 do not directly contact with each other, but a predetermined gap is provided between them to indirectly contact each other as described above. It is desirable to have a relationship.

From this point of view, in the present embodiment,
As shown in FIG. 1 and FIG. 2, for example, the first to third work coils 2, 3, 4 (in FIG. 2, the third work coil 4
Represents a work coil binding member 1 having a thickness equal to or larger than a predetermined value for forming the predetermined gap.
0, 10, ... Are bound at a plurality of positions, and each of the binding portions forms a predetermined gap with the outer peripheral surface of the protective frame 1 by the binding members 10, 10. Is installed as.

That is, the binding members 10, 10 ...
Is a strip-shaped taping member having a predetermined thickness, and the taping member is wound a predetermined number of times or more necessary to form the predetermined gap, and a plurality of litz wires 2b, 2b ...
.. 3b, 3b ..., 4b, 4b ... are bound together.

The binding members 10, 10 ...
For example, a plurality of magnet core members 6, 6 ...
Is provided at a position corresponding to, and its outer peripheral side is fixed by the magnet core members 6, 6.

In FIGS. 1 and 2, only the third work coil 4 is shown as a representative and its mounting structure is shown. However, as described above, the first and second work coils 2 are provided. Needless to say, the same can be applied to the 3 and 3 in the same manner as described above.

The symbols 2a, 3a and 4a in FIG.
It is a connection terminal to the power source side of each of the first to third work coils 2, 3 and 4.

According to this structure, the protective frame 1 and the first
~ The mutual contact area with the third work coils 2, 3, 4 is much smaller, and as a result, the heat generated by the self-heating of the first to third work coils 2, 3, 4 is not transferred to the protective frame 1. It becomes difficult to communicate. Further, since the heat dissipation area of the protective frame 1 is widened and the cooling effect by heat dissipation is enhanced, the temperature rise of the protective frame 1 is correspondingly reduced. Therefore, the protective frame 1 can be made of an inexpensive synthetic resin material having poor heat resistance other than heat-resistant plastic such as fluorine-based plastic.

Further, the first to third work coils 2, 3,
In the case of No. 4, the contact area with the protective frame 1 is reduced and the area in contact with the air is widened, so that the cooling effect by heat dissipation is enhanced, and the conduction heat from the heated inner pan is also the same. Since the contact area with 1 is small, it becomes more difficult to transmit. As a result, the temperature rise of the first to third work coils 2, 3 and 4 is reduced, and the durability is further improved.

Therefore, unlike the conventional case where a plurality of ribs are integrally formed on the outer peripheral surface of the protective frame itself, (1) "1" is provided at the inner peripheral surface position on the opposite side of the protective frame from the ribs. "Close up" occurs and the appearance becomes poor.

(2) The protective frame itself is deformed due to strain, and the work coil cannot be fixed in a uniform abutting relationship over the entire circumference. ··· Problems do not occur.

In addition, since the formation of the above-mentioned gap is realized at the same time by the binding member originally necessary for each work coil 2, 3, 4, there is almost no increase in cost.

In the case of the above construction, if the thickness of the taping member itself is increased, the number of windings can be reduced, so an appropriate thickness is selected in consideration of this point.

(Second Embodiment) FIG. 3 shows the configuration of an electric rice cooker according to a second embodiment of the present invention.

In the first embodiment described above, in order to increase the gap between the protective frame 1 and the protective frame 1, it is necessary to considerably increase the number of windings of the taping member, which makes the work difficult and inefficient. .

Therefore, in this embodiment, each of the work coils 2, 3 and 3 in the configuration of the above-described first embodiment is different.
4 is formed by winding the taping member 4 a plurality of times and the work coil contact member has a predetermined thickness having elasticity as a work coil contact member. The protective frame 1 having the pef members 11, 11 ...
The work coil binding member 1 for each part of the entire circumferential surface of the
It is characterized in that the parts 0, 10 ... Are closely attached to each other as uniformly as possible and are attached in a stable state.

Therefore, in this structure, the pef member 1 is provided.
.. can be set freely, and the number of windings of the taping member can be reduced.

Moreover, the pef members 11, 11 ...
Are formed on the adhesive surfaces 11a and 11b on the work coil binding member 10, 10 side and the protective frame 1 side, respectively. ., The portions that do not correspond to the magnet core members 6, 6 ... Are reliably fixed in a stable state when the number of the work coil binding members 10, 10 ... Like

Further, in this structure, the work coils 2, 3 and 4 themselves are easily attached because they are easily fixed by adhesion.

The pef members 11, 11, ... Adhesive surfaces 11a, 11b on both sides can be easily realized by using, for example, a double-sided tape.

(Embodiment 3) FIGS. 4 and 5 show the configuration of an electric rice cooker according to Embodiment 3 of the present invention.

In the case of the first embodiment described above, the work of winding the tape is troublesome. Further, in the second embodiment, the pef members 11, 11, ... Are additionally required.

In consideration of such circumstances, in the present embodiment, as shown in the drawing, the clip member 12 having a U-shaped cross section,
12 ... and a plurality of Litz wires 2 of each work coil 2, 3, 4 by the clip members 12, 12 ...
b, 2b ... 3b, 3b ... 4b, 4b ...
One-touch binding, and its magnet core members 6, 6
..Variants 12d and 12e of a predetermined height provided in the vertical direction on each of the surface side and the protection frame 1 surface side are arranged so that a predetermined gap is maintained between the protection frame 1 and the outer peripheral surface thereof. It is characterized by that.

As shown in the figure, the clip members 12, 12 ... Have a U-shaped cross section, and a clip body 12a formed by applying an elastic biasing force in the expanding direction, and the clip body 12a. The engaging rib 12b is provided at one end of the clip body so as to project in the opposite direction, and the engaging hole 12c is provided at the end of the other side piece of the clip body 12a. The main body 12a is connected to the plurality of litz wires 2b, 2b ...
3b, 3b ..., 4b, 4b ... Are fitted from below and the engaging pieces 12b are inserted and engaged in the engaging holes 12c. Multiple Litz wires 2b, 2b ... 3b, 3b ...
.., 4b, 4b ... are removably bundled.

As a result, as shown in FIG. 4, a plurality of litz wires 2 of each work coil 2, 3 and 4 can be operated with one touch.
b, 2b ... 3b, 3b ... 4b, 4b ...
Are bound together, and the convex portions 12 on the side wall surface of the protective frame 1 are
It is attached with a gap of a predetermined size depending on the height (thickness) of d.

The clip body 12a is made of an elastically deformable synthetic resin material or metal material, and pushes the engaging piece 12b in the non-engaging direction so that the engaging projection and the engaging hole are formed. By releasing the engagement with 12c, the clipped state can be released arbitrarily.

(Embodiment 4) FIGS. 6 and 7 show the configuration of an electric rice cooker according to Embodiment 4 of the present invention.

The electric rice cooker of the present embodiment is, like the above-described respective embodiments, a protective frame 1 for accommodating an inner pot in an outer case, and is accommodated in the protective frame 1. First to third work coils 2, 3, 4 provided on the outer peripheral side of the protective frame 1 so as to correspond to the inner pot, and support the work coil 4 on the outer peripheral side of the work coil 4. In the electric rice cooker including the coil base 5, the protection frame 1
A plurality of vertically extending concave grooves 13a, 1
.. are provided, while the grooves 13a, 1 of the concave line are provided.
.. a plurality of protrusions 13b on the outer peripheral surface side,
13b ... Is formed, and a predetermined gap is formed between the work coils 2, 3 and 4 and the outer peripheral surface of the protective frame 1 by the ridges 13b, 13b.

According to this structure, the groove 13 is formed.
b, 13b, ..., and each work coil 2, via the ridges 13b, 13b ,.
3, 4 are fixed to the outer peripheral surface of the protective frame 1 with a predetermined gap.

Therefore, the mutual contact area between the bottom of the protective frame 1 and each work coil 2, 3, 4 is reduced, and as a result, the heat generated by the self-heating of each work coil 2, 3, 4 is transferred to the protective frame 1. Is hard to communicate. In addition, the concave groove 13a,
Protective frame 1 by 13a ... And ridges 13b, 13b.
Since the surface area of the protective frame 1 is increased and the cooling effect by heat radiation is enhanced, the temperature rise of the protective frame 1 is correspondingly reduced. Therefore, the protective frame 1 can be made of an inexpensive synthetic resin material having poor heat resistance other than heat-resistant plastic such as fluorine-based plastic.

Further, the work coils 2, 3 and 4 also have a smaller contact area with the protective frame 1 and a larger area in contact with air, so that the cooling effect by heat radiation is enhanced and the above-mentioned heated inside Conducted heat from the pot is also less likely to be transmitted because the contact area with the protective frame 1 is small. As a result, the temperature rise of each work coil 2, 3, 4 is reduced, and the durability is further improved.

Moreover, unlike the conventional case where the ribs are integrally formed on the protective frame 1 itself, the above-mentioned problems (1) and (2) do not occur at all.

As a result, the conventional problems are solved,
Moreover, it becomes possible to provide an inexpensive electric rice cooker having a protective frame that looks good.

Further, the groove grooves 13a, 13 ...
It also functions as a storage groove for the rice grains, the cups, etc. that have entered the inside of the protective frame 1, and the inner pot stored inside can be appropriately brought into contact with and held on the bottom surface of the protective frame 1. As a result, the electromagnetic induction distance between the inner pot and each work coil 2, 3, 4 can be maintained optimally, and the electromagnetic induction efficiency can be improved.

On the other hand, for that purpose, for example, in the inner pot, the flange width of the opening is enlarged and the inner pan is hung on the opening end 1a of the protective frame 1 to provide a gap between the inner pot and the bottom surface of the protective frame 1. It is no longer necessary to use the inner pot locking structure.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure and a relationship among a protective frame, a work coil, and a coil base of an electric rice cooker according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a protection frame, a work coil, and a magnet core member which are main parts of the electric rice cooker.

FIG. 3 is an enlarged exploded perspective view of a protection frame, a work coil, and a magnet core member, which are essential parts of the electric rice cooker according to Embodiment 2 of the present invention.

FIG. 4 is an enlarged exploded perspective view of a protection frame, a work coil, and a magnet core member which are essential parts of an electric rice cooker according to a third embodiment of the present invention.

FIG. 5 is an exploded perspective view showing the configuration and operation of a clip member that is a main part of the electric rice cooker.

FIG. 6 is an enlarged cross-sectional view showing the structure of the protective frame portion of the electric rice cooker according to the fourth embodiment of the present invention.

FIG. 7 is a partially cutaway front view (AA in FIG. 6) of a main part of a protective frame portion of the electric rice cooker.

FIG. 8 is a protective frame in the configuration of a conventional general electric rice cooker,
FIG. 3 is an exploded perspective view showing the structures of the work coil and the coil base and their mutual relationships.

[Explanation of symbols]

1 is a protective frame, 2 is a first work coil, 3 is a second work coil, 4 is a third work coil, 5 is a coil base, 6
Is a magnet core member, 6a is a core case, 6b is a magnet core, 10 is a binding member, 11 is a pef member, 11
a and 11b are adhesive surfaces, 12 is a clip member, 12a is a clip body, 12b is an engaging rib, 12c is an engaging hole, and 12 is an engaging hole.
d and 12e are convex portions, 13a is a concave groove, and 13b is a convex portion.

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) A47J 27/00 103 H05B 6/12 311 H05B 6/36

Claims (8)

(57) [Claims] 1. A protective frame for accommodating an inner pot in an outer case, a work coil provided on the outer peripheral side of the protective frame so as to correspond to the inner pot accommodated in the protective frame, In an electric rice cooker provided with a coil base for supporting the work coil on the outer peripheral side of the work coil, the work coil is bound at a plurality of positions by a work coil binding member having a thickness of a predetermined value or more, An electric rice cooker characterized by being provided with a predetermined gap from the protective frame by the binding member. 2. The coil base is provided with a plurality of magnet core members in a radial direction, and the binding member is provided at a position corresponding to the magnet core members. Electric rice cooker. 3. A work coil contact member is provided between the binding member and the protective frame to uniformly and uniformly contact the work coil binding portion with the outer peripheral surface of the protective frame. The electric rice cooker according to claim 1. 4. The electric rice cooker according to claim 3, wherein a surface of the work coil contact member that comes into contact with the protective frame is formed to have an adhesive function. 5. The binding member comprises a strip-shaped taping member, and the taping member is wound a predetermined number of times or more to bind a plurality of work coils so that a thickness capable of forming a predetermined gap is obtained. The electric rice cooker according to claim 1, 2, 3, or 4. 6. The electric rice cooker according to claim 1, wherein the binding member is a clip member that detachably clips a plurality of litz wires. 7. The contact surface of the clip member with the protective frame is
The electric rice cooker according to claim 6, wherein a convex portion having a predetermined thickness is provided. 8. A protective frame for housing an inner pot in an outer case; a work coil provided on the outer peripheral side of the protective frame so as to correspond to the inner pot housed in the protective frame; In an electric rice cooker provided on the outer peripheral side of a work coil and supporting the work coil, an inner surface of the protective frame is provided with a plurality of vertically extending concave grooves, An electric rice cooker characterized in that the groove of the concave line forms a plurality of convex line parts on the outer peripheral surface, and a predetermined gap is formed between the work coil and the protective frame by the convex line parts. .