JP2019063448A - Cooking pot - Google Patents

Abstract

To provide a cooking pot capable of establishing compatibility between heating efficiency and productivity and excellent in rustproof property.SOLUTION: A cooking pot 10 comprises: a pot body 14 that has an annular flange part 17 including at least three layers, that is, an iron layer 23 and metallic layers 22 and 24 except iron, superposed on both surfaces thereof, and protruding outward from the periphery of an upper end opening 11; and a metal ring member 28 for covering an end surface 23a of the iron layer 23 of the flange part 17. The pot body 14 is made of a clad material 20 in which an aluminum layer 21, a first stainless steel layer 22, the iron layer 23 and a second stainless steel layer 24 are stacked from the inside to the outside in this order.SELECTED DRAWING: Figure 3B

Description

  The present invention relates to a cooking pot.

  In a cooking pot used for an electromagnetic cooker such as a rice cooker, in order to improve the heat generation efficiency by induction heating, it is desirable to use iron which is a ferromagnetic material as a pot material. Patent Literatures 1 and 2 disclose a cooking pot as described above.

  In the cooking pot disclosed in Patent Document 1, the entire pot is formed of iron. In this cooking pot, iron is prevented from rusting by covering the outer surface with a enamel coat layer. However, this cooking pot is not suitable for mass production because it is manufactured by casting using a sand mold.

  The cooking pot disclosed in Patent Document 2 is formed of a clad material including an aluminum plate and an aluminum-plated steel plate in which iron is plated with aluminum. In this cooking pot, the end face of the iron layer is rusted by covering the outer surface with a rustproof layer by coating. Since this cooking pot can be manufactured by press processing, it is more suitable for mass production than the cooking pot of Patent Document 1. However, since the anticorrosive layer by coating peels off when it collides with a hard object, the cooking pot of Patent Document 2 has room for improvement with regard to the anticorrosion.

JP, 2012-200346, A JP, 2009-254473, A

  In view of the problems of the prior art, it is an object of the present invention to provide a cooking pot which can achieve both improvement in heat generation efficiency and productivity and is also excellent in rust resistance.

  The cooking pot of the present invention comprises a pan body having at least three layers of an iron layer and a metal layer other than iron laminated on both sides thereof, and having an annular flange portion projecting outward from the periphery of the upper end opening; And a metal ring member covering an end face of the iron layer in the flange portion.

  According to this cooking pot, since iron which is a ferromagnetic material is used for the pan body, the heat generation efficiency by induction heating can be improved. Moreover, since a cooking pot can be manufactured by press processing, productivity can be improved compared with manufacture by casting using a sand mold. Furthermore, since the metal ring member covering the end face of the iron layer has high strength as compared with the coating, and does not peel off or break even when it collides with a hard object, rust of the iron layer can be reliably prevented. Moreover, when the thickness of the ring member in the direction along the axis of the cooking pot is set large, the heat storage property of the upper portion of the cooking pot can be improved, and a high-class feeling can also be produced by mirror finish.

  The pan body may be made of a clad material laminated from the inside to the outside in the order of the aluminum layer, the first stainless steel layer, the iron layer, and the second stainless steel layer. According to this aspect, since the bonding strength of the clad material using iron can be increased, the productivity of the pan body by press processing can be improved.

  The pot body has a notch portion obtained by removing the second stainless steel layer and the iron layer at the flange portion, the ring member is made of stainless steel, and the second stainless steel layer of the pot body and the notch portion It may be joined to the exposed first stainless steel layer. According to this aspect, since the ring member to be joined and the layer of the pan body are the same stainless steel, they can be joined reliably. Therefore, since it is possible to reliably prevent water immersion in the gap between the ring member and the pot body, the corrosion resistance of the iron layer of the pot body can be improved.

  The ring member is made of a clad material having an L-shaped cross section formed of an aluminum layer located on the inner side and a stainless steel layer located on the outer side, and the aluminum layer of the ring member is the aluminum layer of the pan body The stainless steel layer of the ring member may be joined to the second stainless steel layer of the pan body, respectively. According to this aspect, since the ring member can also be formed by press processing, the productivity of the cooking pot can be improved. Moreover, since the layer of the pot body and the layer of the ring member to be joined are aluminum to one another and stainless steel to one another, they can be joined reliably. Therefore, since it is possible to reliably prevent water immersion in the gap between the ring member and the pot body, the corrosion resistance of the iron layer of the pot body can be improved.

  An air gap may be provided between the aluminum layer of the ring member and the second stainless steel layer of the pan body. According to this aspect, it is possible to improve the heat retention of the upper portion of the cooking pot by the gap.

  The outer peripheral surface of the ring member may be mirror-finished. According to this aspect, the appearance of the cooking pot can be improved, and a sense of quality can be provided.

  In the cooking pot of the present invention, since iron which is a ferromagnetic material is used for the pan body, the heat generation efficiency by induction heating can be improved. Moreover, since the pot body can be formed by press processing, the productivity of the cooking pot can be improved. Furthermore, since the metal ring member is higher in strength than the coating, and does not come off or break, the rust of the iron layer of the pan body can be reliably prevented.

Sectional drawing which shows the rice cooker using the cooking pot which concerns on 1st Embodiment of this invention. The disassembled perspective view of the cooking pot of 1st Embodiment. Sectional drawing of the cooking pot of 1st Embodiment. The partially expanded sectional view of FIG. 3A. The partially expanded sectional view which shows the 1st state of the manufacturing process of a cooking pot. The partially expanded sectional view which shows the 2nd state of the manufacturing process of a cooking pot. The partially expanded sectional view which shows the 3rd state of the manufacturing process of a cooking pot. Sectional drawing of the cooking pot of 2nd Embodiment. The partially expanded sectional view of FIG. 5A. The partially expanded sectional view which shows the modification of a cooking pot.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First Embodiment
FIG. 1 shows a cooking pot (cooking pan) 10 for induction heating according to a first embodiment of the present invention disposed in a rice cooker (cooker) 1. The rice cooker 10 is detachably accommodated in the accommodating portion 3 of the rice cooker body 2 and is closed by a lid 5 disposed on the rice cooker body 2 so as to be openable and closable. Moreover, the rice cooker 10 is induction-heated by the eddy current which generate | occur | produced when the high frequency current is supplied with electricity to the coil 4 arrange | positioned on the outer side of the accommodating part 3. FIG. The rice cooker 10 of the present embodiment uses iron which is a ferromagnetic material as a pot material in order to improve the heat generation efficiency by induction heating, and reliably prevents the rust of the iron.

(Overview of the cooking pot)
As shown to FIG. 2 and FIG. 3A, the rice cooker 10 is a bottomed cylindrical container which made the bottom closed and made the upper end the opening 11. As shown in FIG. Around the opening 11 is formed a flange 12 which protrudes outward in the radial direction about the axis line A of the rice cooker 10. The flange portion 12 is configured of the flange portion 17 of the pot body 14 and a ring member 28 separate from the pot body 14 disposed below the flange portion 17.

  The pot body 14 includes a circular bottom portion 15, an outer peripheral portion 16 rising from the outer periphery of the bottom portion 15, and an annular flange portion 17 that constitutes a part of the flange 12. These are formed by pressing (deep drawing) the clad material 20. Referring also to FIG. 3B, the clad material 20 includes an aluminum layer 21, a first stainless steel layer 22, an iron layer 23, and a second stainless steel layer 24. In this order, the inside (outside the pan) to the outside (outside the pan) Are stacked on.

  The ring member 28 prevents the end face 23a of the iron layer 23 of the flange portion 17 from being exposed, and prevents the progress of corrosion (rust) from the end. The ring member 28 is formed in an annular shape by bending a rod-like stainless material and joining one end and the other end. The ring member 28 is disposed from the bottom 15 side of the pot body 14 to the lower side of the flange portion 17 and is joined by welding (joint portions 30A, 30B).

  Here, when iron and aluminum constituting the clad material 20 are directly roll-joined (cladding), the joint strength becomes low due to the difference between these materials. On the other hand, although iron and stainless steel, and aluminum and stainless steel are different metals, the bonding strength is higher than in the case of cladding iron and aluminum. Therefore, by interposing the first stainless steel layer 22 between the iron layer 23 and the aluminum layer 21, these are joined with high strength. Moreover, when exposing the outer surface of the iron layer 23, it is necessary to apply the coating for antirust to the whole surface of the iron layer 23, and since a coating may peel and damage, it is unpreferable. Therefore, the second stainless steel layer 24 having magnetism is provided on the outer side of the iron layer 23 to improve the heating efficiency and the corrosion resistance of the iron layer 23.

  The thickness of each layer 21-24 is set according to the thickness and heating amount of the required rice cooker 10 whole. Specifically, in order to enhance the heat storage property, it is preferable to thicken the entire cooking pot 10. Further, in order to increase the heat generation efficiency by induction heating, it is preferable to thicken the stainless steel layers 22 and 24 which are magnetic materials. However, if the stainless steel layers 22 and 24 are thickened, the cooking pot 10 becomes excessively heavy. So, in this embodiment, the layer 23 of iron which has magnetism stronger than stainless steel is provided, and thickness of stainless steel layers 22 and 24 is made thin. Moreover, the thickness of the whole cooking pot 10 is ensured, ensuring the conductivity of heat by the layer 21 of aluminum whose specific gravity is lighter than stainless steel.

  The stainless steel layers 22 and 24 are laminated on both sides of the iron layer 23, and the bonding strength of the layers 21 to 24 is enhanced, so that the pan body 14 can be manufactured by pressing. Therefore, the productivity of the pot body 14 (the rice cooker 10) can be improved as compared to the manufacture by casting using a sand mold.

  Since iron, which is a ferromagnetic material, is used for the pan body 14, the heat generation efficiency of the cooking pot 10 by induction heating can be improved. Moreover, since the layer 21 of aluminum having a specific gravity smaller than that of the stainless steel is provided, it is possible to increase the overall thickness and to give a sense of luxury while suppressing the cooking pot 10 from becoming excessively heavy.

  Since both sides of the iron layer 23 are covered with the stainless steel layers 22 and 24, and the end face 23a of the iron layer 23 is covered with the ring member 28, rusting of the iron layer 23 can be prevented. In addition, since the ring member 28 is higher in strength than the coating for rust prevention, and does not separate or break even when it collides with a hard object, the rust of the iron layer 23 accompanying the breakage can be reliably prevented. Moreover, since the thickness of the ring member 28 in the direction along the axis A of the cooking pot 10 can be set large as necessary, the heat storage property and the appearance of the upper portion of the cooking pot 10 can be improved.

(Details of the arrangement structure of the ring member)
In order to reliably prevent the end face 23 a of the iron layer 23, it is preferable to reliably join the pot body 14 and the ring member 28. For that purpose, it is more preferable to weld metals of the same material than to weld dissimilar metals. So, in this embodiment, as shown to FIG. 3A, the notch part 26 which removed the 2nd stainless steel layer 24 and the iron layer 23 is provided in the flange part 17 of the pan main body 14, and the end surface of the iron layer 23 by the ring member 28. 23a is covered, and a stainless steel ring member 28 is welded to the first stainless steel layer 22 and the second stainless steel layer 24, respectively.

  Specifically, the flange portion 17 includes a curved portion 17 a curved with a defined radius of curvature, and a flat portion 17 b extending in a direction orthogonal to the axis A. The curved portion 17 a is continuous with the outer peripheral portion 16, and the flat plate portion 17 b is continuous with the curved portion 17 a.

  Referring to FIG. 4A and FIG. 4B together, the notch portion 26 is formed by cutting the second stainless steel layer 24 and the iron layer 23 of the entire curved portion 17a and the entire flat plate portion 17b in the flange portion 17. There is. In the curved portion 17a, the end surface (cut surface) 23a of the iron layer 23 and the end surface 24a of the second stainless steel layer 24 are configured to be flush with the outer surface of the second stainless steel layer 24 of the outer peripheral portion 16 (the same diameter). It is done.

  The inner diameter of the ring member 28 is substantially the same as the outer diameter of the upper portion 16 a of the outer peripheral portion 16, and the outer diameter of the ring member 28 is substantially the same as the outer diameter of the flange portion 17. In addition, the upper part 16a of the outer peripheral part 16 is a cylindrical part extended by the same diameter along the axis line A of the rice cooker 10. As shown in FIG. A curved surface 29 having a curvature corresponding to the curvature of the outer surface of the first stainless steel layer 22 in the curved portion 17 a is formed on the inner upper portion of the ring member 28. Thereby, as shown to FIG. 4C, the upper surface of the ring member 28 containing the curved surface 29 is arrange | positioned in surface contact with the 1st stainless steel layer 22 which appeared by the notch part 26. As shown in FIG.

  The lower surface of the first stainless steel layer 22 of the flange portion 17 exposed by the notch 26, the end face 23a of the iron layer 23, and the end face 24a of the second stainless steel layer 24 are covered by a ring member 28. At the lower end of the flange 12, the second stainless steel layer 24 of the outer peripheral portion 16 and the ring member 28 are welded along the entire circumference (joint 30A). At the outer end of the flange 12, the first stainless steel layer 22 of the flange portion 17 and the ring member 28 are welded along the entire circumference (joint portion 30B).

  In the rice cooker 10 thus configured, since the ring member 28 to be welded and the layers 22 and 24 of the pot body 14 are the same stainless steel, welding can be reliably performed with high strength as compared to welding dissimilar metals. Therefore, since it is possible to reliably prevent water immersion in the gap between the pot body 14 and the ring member 28, rusting of the iron layer 23 can be effectively prevented.

(Surface treatment of a rice cooker)
As shown in FIGS. 3A and 3B, a protective layer 32 is provided on the outer surface of the pan body 14 from the bottom 15 to the lower end of the ring member 28. The protective layer 32 is formed by coating a heat resistant resin on the outer surface of the second stainless steel layer 24 and baking it.

  The outer peripheral surfaces of the ring member 28, the aluminum layer 21, and the first stainless steel layer 22 constituting the flange 12 are mirror-finished. In this mirror surface process, the outer peripheral surface of the flange 12 is polished by an abrasive to a level close to the mirror surface. The outer peripheral surface of the ring member 28 is an outer end surface 28 a parallel to the axis A of the rice cooker 10. The lower surface 28 b of the ring member 28 may be mirror-polished, may be provided with a protective layer 32, or may not be surface-treated.

  A fluorine coating layer 33 is provided on the inner surface of the pan body 14 from the bottom portion 15 to the upper surface of the flange portion 17. The fluorine coating layer 33 is a heat-resistant part excellent in heat resistance and water repellency, and is formed by applying and baking a fluorine resin with a uniform film thickness.

  As described above, the protective layer 32 is coated on the outer surface of the rice cooker 10, and the outer peripheral surface of the thick flange 12 is mirror-finished, so that the appearance of the rice cooker 10 can be improved and a sense of luxury is achieved. Can.

(How to make a rice cooker)
Next, an example of a method of manufacturing the cooking pot 10 will be described. First, the flat clad material 20 is press-worked to manufacture the pan body 14 including the bottom portion 15, the outer peripheral portion 16 and the flange portion 17. As shown in FIG. 4A, in this state, in the flange portion 17, the aluminum layer 21, the first stainless steel layer 22, the iron layer 23, and the second stainless steel layer 24 are stacked in this order from the upper side to the lower side. ing.

  Next, as shown in FIG. 4B, the second stainless steel layer 24 and the iron layer 23 on the lower side of the flange portion 17 are cut to form a notch 26. Next, as shown in FIG. 4C, a ring member 28 formed by bending a stainless steel material is disposed below the flange portion 17 from the bottom portion 15 side. Thereafter, the inner end of the ring member 28 is welded to the second stainless steel layer 24 of the outer peripheral portion 16, and the outer end of the ring member 28 is welded to the first stainless steel layer 22 of the flange portion 17.

  Next, the outer peripheral surface of the flange 12 is mirror-finished. Thereafter, as shown in FIGS. 3A and 3B, the surface of the aluminum layer 21 is coated with the fluorine coating layer 33, and then the surface of the second stainless steel layer 24 is coated with the protective layer 32.

  Thus, the pot body 14 is formed by press processing, the ring member 28 is formed by bending processing, and the rice cooker 10 can be formed by joining these by welding. Therefore, compared with the casting which used the sand mold, productivity of the cooking pot 10 can be improved significantly.

Second Embodiment
Drawing 5A and Drawing 5B show cooking pot 10 (cooking pan) for induction heating of a 2nd embodiment. In the second embodiment, a ring member 35 having an L-shaped cross section is disposed without providing a notch in the flange portion 17 of the pan body 14. Further, in order to securely join the pot body 14 and the ring member 35 by welding, the ring member 35 is formed of the clad material 36 formed of the aluminum layer 37 and the stainless steel layer 38, and the aluminum layer 37 of the ring member 35 The stainless steel layer 38 of the ring member 35 is welded to the aluminum layer 21 of the main body 14 and the first stainless steel layer 22 of the pan body 14 respectively.

  Specifically, the pan body 14 is made of the same clad material 20 as that of the first embodiment. In the flange portion 17 of the pan body 14, the aluminum layer 21, the first stainless steel layer 22, the iron layer 23, and the second stainless steel layer 24 are stacked in this order from the upper side to the lower side.

  The ring member 35 is formed by pressing so that the aluminum layer 37 is located inside and the stainless steel layer 38 is located outside. The ring member 35 has an outer wall 39 covering the outer peripheral surface of the flange portion 17 and a lower wall 40 covering the lower side of the flange portion 17. The inner diameter of the outer wall 39 is formed to have the same size as the outer diameter of the flange portion 17 of the pot body 14. The lower wall 40 is continuous with the lower end of the outer wall 39 and protrudes radially inward of the ring member 35. The inner diameter of the lower wall 40 is formed to have the same size as the outer diameter of the upper portion 16 a of the outer peripheral portion 16.

  As shown most clearly in FIG. 5B, the aluminum layer 37 of the outer wall 39 is joined by welding to the aluminum layer 21 of the flange 17 of the pan body 14 (joint 30B). The stainless steel layer 38 of the lower wall 40 is joined to the second stainless steel layer 24 of the upper portion 16a of the outer peripheral portion 16 by welding (a joint 30A). Thus, although the pot body 14 and the ring member 35 are respectively formed by the clad materials 20 and 36 in which dissimilar metals are laminated, the layers 37 and 38 of the ring member 35 and the layers 21 and 24 of the pot body 14 to be welded And are configured to be the same material.

  The dimension of the outer wall 39 in the direction along the axis A of the rice cooker 10 is set larger than the dimension (thickness) of the flange portion 17 in the same direction. Thus, a gap 41 is formed between the aluminum layer 37 of the lower wall 40 and the second stainless steel layer 24 of the pan body 14. In the present embodiment, the dimension of the outer wall 39 (the interval of the air gap 41) is set such that the inner end of the lower wall 40 is joined to the upper portion 16a of the outer peripheral portion 16. Thereby, compared with the case where the inner end of lower wall 40 is joined to bent side 17a, the welding failure by a manufacturing error can be prevented.

  When manufacturing the rice cooker 10 of 2nd Embodiment, the ring member 35 formed by press processing is arrange | positioned from the bottom part 15 side of the pot main body 14 to the downward side of the flange part 17. As shown in FIG. At this time, the upper end of the outer wall 39 is made to coincide with the upper surface of the flange portion 17.

  Next, the aluminum layer 37 of the ring member 35 is welded to the aluminum layer 21 of the pan body 14, and the stainless steel layer 38 of the ring member 35 is welded to the second stainless steel layer 24 of the pan body 14. Thereafter, as in the first embodiment, after the outer peripheral surface of the flange 12 is mirror-finished, the fluorine coating layer 33 is formed on the surface of the aluminum layer 21, and the protective layer 32 is formed on the surface of the second stainless steel layer 24. The mirror surface processing of the flange portion 12 is performed on the outer surface of the outer wall 39 of the ring member 35. The lower wall 40 of the ring member 35 may be mirror-polished, may be provided with a protective layer 32, and may not be surface-treated.

  In the cooking pot 10 of the second embodiment, the ring member 35 can also be formed by press processing, and there is no need to provide a cutaway portion in the pan body 14, which can further improve the productivity. Further, since the aluminum layer 21 of the pan body 14 and the aluminum layer 37 of the ring member 35, and the second stainless steel layer 24 of the pan body 14 and the stainless steel layer 38 of the ring member 35 are the same material, they can be joined reliably. . Therefore, since it is possible to reliably prevent water immersion in the gap between the ring member 35 and the pot body 14, the corrosion resistance of the iron layer 23 of the pot body 14 can be improved.

  Since the heat insulation can be achieved by the air gap 41 between the flange portion 17 and the lower wall 40, the heat retention of the upper portion of the cooking pot 10 can be improved. Further, since the ring member 35 is formed by press processing, the degree of freedom in dimension setting of the outer wall 39 corresponding to the thickness of the flange 12 is high. Therefore, since the flange 12 can be thickened as needed, a more luxurious feeling can be brought out.

  In addition, this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, the pan main body 14 should just be a structure containing at least 3 layers of the iron layer 23 and metal layers other than iron laminated | stacked on the both surfaces. Moreover, these metal layers may use separate metal plates which are not joined by rolling.

  The shapes of the flange portion 17 and the notch portion 26 in the first embodiment and the shape of the corresponding ring member 28 may be changed as needed.

  As shown in FIG. 6, in the first embodiment, a projection that covers the end faces of the aluminum layer 21, the first stainless steel layer 22, the iron layer 23, and the second stainless steel layer 24 without providing a notch in the flange 17. The (stepped portion) 28 c may be provided on the ring member 28. In this case, as shown in FIG. 6, the protrusion 28c made of stainless steel may be joined to the aluminum layer 21 of the flange 17 which is a dissimilar metal. Alternatively, the upper end of the protrusion 28c may be made to coincide with the first stainless steel layer 22, and the same stainless steel material may be joined.

  The shapes of the flange portion 17 and the ring member 35 in the second embodiment may be changed as necessary. The air gap 41 may not be provided between the aluminum layer 37 of the ring member 35 and the second stainless steel layer 24 of the pan body 14.

  In the said embodiment, although the rice cooker 10 used for the rice cooker 1 which is one of cookers was mentioned as the example and demonstrated, the cooker of this invention should just be used for an electromagnetic cooker.

1 ... Rice cooker (cooker)
2 ... body of rice cooker 3 ... accommodation part 4 ... coil 5 ... lid body 10 ... cooking pot (cooking pan)
DESCRIPTION OF SYMBOLS 11 ... Opening 12 ... Flange 14 ... Pot body 15 ... Bottom part 16 ... Outer peripheral part 16a ... Upper part 17 ... Flange part 17a ... Curved part 17b ... Flat part 20 ... Clad material 21 ... Aluminum layer 22 ... 1st stainless steel layer 23 ... Iron layer 23a: end face 24: second stainless steel layer 24a: end face 26: notch 28: ring member 28a: outer end face (peripheral surface)
28b: lower surface 28c: projecting portion 29: curved surface 30A, 30B: joint portion 32: protective layer 33: fluorine coating layer 35: ring member 36: cladding material 37: aluminum layer 38: stainless layer 39: outer wall (outer peripheral surface)
40 ... lower wall 41 ... air gap

Claims (6)

A pan body including at least three layers of an iron layer and a metal layer other than iron laminated on both sides thereof, and having an annular flange portion projecting outward from the periphery of the upper end opening;
And a metal ring member covering an end face of the iron layer in the flange portion.   The cooking pot according to claim 1, wherein the pot body comprises a clad material laminated from the inside to the outside in the order of an aluminum layer, a first stainless steel layer, the iron layer, and a second stainless steel layer. The pot body has a notch in the flange portion from which the second stainless steel layer and the iron layer are removed,
The cooking pot according to claim 2, wherein the ring member is made of stainless steel and is joined to the second stainless steel layer of the pot body and the first stainless steel layer exposed by the notch. The ring member is made of a clad material having an L-shaped cross section, which is formed of an aluminum layer located on the inner side and a stainless steel layer located on the outer side,
The cooking pot according to claim 2, wherein the aluminum layer of the ring member is joined to the aluminum layer of the pan body, and the stainless steel layer of the ring member is joined to the second stainless steel layer of the pan body.   The cooking pot according to claim 4, wherein a gap is provided between the aluminum layer of the ring member and the second stainless steel layer of the pot body.   The cooking pot according to any one of claims 1 to 5, wherein the outer peripheral surface of the ring member is mirror-finished.

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