JP2004243116A - Induction heating cooking apparatus, pot therefor, and production process therefore - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pot assembly under induction heating and a process for its production. <P>SOLUTION: The induction heating cooking pot assembly has an inner pot with numerous projections partially located on its outside and holes holding the projections and a magnetizable metallic cap at least partially compressed on the outside of the inner pot. The process for its production is composed of (a) formation of the inner pot with a cooking space and an opening in the pot and the upper part of pot, respectively, (b) formation of a shape at least partially corresponding to the outside of the inner pot and the cap having numerous holes, (c) a preheating step of the inner pot and the cap at a predetermined temperature, and (d) a compression step of the inner pot and the cap at elevated temperatures. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to an induction heating cooking appliance, and more particularly, to a kettle that is induction-heated in a cooking appliance and a method of manufacturing the same.

  Recently, induction heating type cooking appliances that cook food using electricity have been frequently used.

  Such induction heating type cooking appliances use the resistance heat generated when an eddy current (eddy current) induced by a magnetic field formed around a coil to which an electric current is applied flows through the cooking pot. ) Cook the food stored inside. FIG. 1 shows an example of such an induction heating type cooking appliance. Hereinafter, the induction heating type cooking appliance will be described with reference to FIG.

  Referring to FIG. 1, the case 1 has a space inside, and the upper part is open. The cover 2 is hinged to the case 1 so that the upper part of the case 1 can be opened and closed. In the internal space of the case 1, a shuttle 3 is provided. The shuttle 3 is attached to the internal space of the case 1 or pulled out through an open upper portion of the case 1.

  Here, as shown in FIG. 2, the shuttle 3 is generally manufactured by drawing a clad plate formed by joining stainless steel 3a and aluminum 3b. In the pot 3 thus manufactured, the stainless steel 3a forms the outside of the pot 3, and the aluminum 3b forms the inside of the pot 3.

  A coil 4 is provided in the internal space of the case 1, and the coil 4 faces the bottom surface and the lower side surface of the shuttle 3 when the shuttle 3 is mounted in the case 1. A first heater 5 is provided on the upper side of the coil 4. The first heater 5 wraps almost all of the upper outer peripheral surface of the shuttle 3 when the shuttle 3 is mounted in the case 1. Become. The cover 2 is provided with a second heater 6 disposed so as to face the open upper part of the shuttle 3.

  The cover 2 is provided with a valve 8 for discharging steam inside the cooking pot 3 to the outside during or after cooking. A sensor 7 for measuring the internal temperature of the shuttle 3 is provided in the inner space of the cover 2 and the case 1.

  When a current is applied to the coil 4 of the induction heating cooker having the above-described structure, magnetic lines of force are generated around the coil 4. At this time, the shuttle 3 is mounted in the case 1, and the lines of magnetic force pass through the shuttle 3. When the lines of magnetic force pass through the shuttle 3, a large number of eddy currents are generated around the lines of magnetic force. When the eddy currents flow inside the shuttle 3, resistive heat is generated and the shuttle 3 itself becomes hot. As described above, the food stored in the pot 3 is heated by the resistance heat generated from the pot 3 itself. On the other hand, the first and second heaters 5 and 6 serve to supplementarily heat food during cooking or to keep food warm after cooking is completed.

  However, the general induction cooking device that operates as described above has the following problems.

  First, in order to manufacture a kettle, a clad plate must first be made using stainless steel and aluminum, and then the clad plate must be drawn. Therefore, the number of steps for manufacturing the kettle increases and the manufacturing cost increases.

  Second, since the entire outer surface of the pot is made of stainless steel, material costs are increased and the weight of the pot is increased.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an induction heating cooker having an improved structure which can be easily manufactured, and a method of manufacturing the same.

  It is another object of the present invention to provide a light induction cooker and a method of manufacturing the same.

  It is still another object of the present invention to provide an induction heating cooker having a beautiful appearance and a method of manufacturing the same.

  In the first embodiment of the present invention for achieving the above object, an inner pot including a number of protrusions provided on a part of an outer surface and a hole for accommodating the protrusions are squeezed on at least a part of an outer surface of the inner pot. Further, there is provided an induction heating cooker provided with a cap made of a magnetizable metal material.

  According to one feature of the present invention, the cap is provided on a lower surface of the inner pot or a lower peripheral surface of the inner pot.

  According to another feature of the present invention, the cap is provided on the entire outer peripheral surface of the inner hook.

  According to another feature of the invention, the inner pot is made of aluminum and the cap is made of stainless steel.

  According to another embodiment of the present invention, there is provided a case having an open upper part with a space therein, and a cover hinged to the case to open and close the upper part of the case. And, an inner pot including a number of protrusions provided on a part of the outer surface, and having a hole for accommodating the protrusions, squeezed on at least a part of the outer surface of the inner pot, comprising a cap of a magnetizable metal material, Provided is an induction heating cooking device including a pot mounted or separated in the case and a coil provided in the case and arranged to face the cap when the pot is mounted.

  According to one feature of the present invention, the induction heating cooking device further includes a heater provided at at least one of the case and the cover.

  According to another feature of the present invention, the induction heating cooking device further includes a valve provided on the cover, for discharging steam inside the inner pot to the outside.

  On the other hand, in another embodiment of the present invention for achieving the above object, (a) forming an inner pot having a cooking space and an opening inside and at an upper portion, and (b) at least an outer surface of the inner pot. (C) preheating the inner pot and the cap at a predetermined temperature, and (d) heating the inner pot and the cap to a high temperature. And a step of squeezing.

  According to one feature of the present invention, the step (a) is performed by drawing the first plate.

  According to another feature of the present invention, the step (b) includes a step of forming the hole by piercing a second plate, and a step of plastically deforming the second plate in which the hole is formed.

  According to another feature of the present invention, the step (d) is performed until a part of the outer peripheral surface of the inner hook is pressed and fitted into the hole of the cap.

  The present invention has the following effects by providing the above-described configuration.

  The present invention does not include a complicated process for manufacturing a clad plate material and a process for further processing the processed clad plate material, and separately manufactures the inner pot and the cap by pressing separately, so that the pot is easier than in the past. Can be manufactured.

  Further, according to the present invention, since the cap is provided only in a portion necessary for induction heating, the weight of the pot can be reduced as compared with the conventional one, and the manufacturing cost can be reduced because less expensive stainless steel material is used. This has a second effect of being able to perform

  Further, according to the present invention, since the hole of the cap can be manufactured in various shapes, not only a beautiful appearance can be obtained but also the external design of the shuttle can be easily deformed. Having.

  Further, according to the present invention, a part of the outer surface of the inner pot is combined while being pressed into the hole of the cap by high temperature and pressure, so that it is not necessary to use a separate auxiliary material for bonding, and the protrusion and the hole are used. The fourth effect is that the inner pot and the cap are very firmly connected.

  Hereinafter, embodiments of the present invention capable of realizing the above-described objects will be described with reference to the accompanying drawings.

  In the description of the present embodiment, the same components are denoted by the same names and reference numerals, and the additional description is omitted below.

  The general configuration of the induction heating apparatus according to the present invention is the same as that described with reference to FIG.

  Therefore, description of the structure of the induction heater according to the present invention is omitted, and the structure of the kettle according to the present invention mounted on the induction heating device will be described below.

  Referring to FIG. 3, the shuttle 100 according to the present invention includes an inner shuttle 110 and a cap 120 pressed on an outer surface of the inner shuttle 110.

  The inner pot 110 is made of a metal material having a good heat transfer coefficient, for example, an aluminum material. Such an inner pot 110 has a cooking space 101 in which food is stored and food is cooked by heat. The upper part of the inner pot 110 is opened so that a user can put food in and out of the cooking space 101.

  The inner pot 110 has a substantially cylindrical shape and a flat bottom. And, the side surface of the inner pot 110, that is, the outer peripheral surface and the bottom surface are connected by a rounded curved surface as shown in FIG.

  A flange 115 protrudes from an upper peripheral surface of the inner pot 110 having the above-described shape. The flange 115 only serves to limit the insertion depth of the inner pot 110 when the inner pot 110 is mounted in the case 1 of the induction heating cooker of the type shown in FIG. Rather, it serves to improve the airtightness between the inner pot 110 and the cover 2.

  A plurality of protrusions 111 are provided on a part of the outer surface of the inner hook 110 as shown in FIG. The protrusions 111 are inserted into a plurality of holes 121 provided in the cap 120 and serve to increase a coupling force between the inner hook 110 and the cap 120.

  Meanwhile, the cap 120 is made of a magnetizable metal material, but is preferably made of a metal having a high electric resistance. When the cap 120 is made of a material having such properties, a large amount of resistance heat can be obtained when a magnetic field is transmitted through the pot 100 and an eddy current flows, so that the heat required for cooking is more easily obtained. be able to. As a material of the cap 120 requiring the above-described properties, for example, stainless steel can be used.

  The cap 120 is squeezed and attached to a part of an outer surface of the inner pot 110 necessary to enable induction heating. To this end, the inner surface of the cap 120 has the same shape as a part of the outer surface of the inner hook 110. In this case, it is preferable that the cap 120 is provided on the lower surface of the inner hook 110. Further, as shown in FIG. 3, it is preferable that the inner hook 110 is provided not only on the lower surface but also on a lower peripheral surface. The cap 120 provided as described above faces the coil 4 when the pot 100 is mounted on an induction heating cooking device of the type shown in FIG.

  Meanwhile, the cap 120 is not limited to such a structure, and may be provided on the entire outer surface of the inner hook 110 if necessary. In this case, the inner surface of the cap 120 has the same shape as the entire outer surface of the inner hook 110.

  A plurality of holes 121 are formed in the cap 120, and each of the holes 121 has a circular shape, for example, as shown in FIG. However, the shape of each of the holes 121 is not limited thereto, and may be formed in various shapes such as a polygon such as a triangle, a quadrangle, and a star, or an ellipse. As described above, if the patterns of the holes 121 are variously formed, the appearance of the shuttle 100 can be further enhanced. By changing the pattern of the hole 121 when manufacturing the cap 120, the external design of the shuttle 100 according to the present invention can be easily changed.

  Meanwhile, the projections 111 of the inner hook 110 are coupled to the holes 121 formed in the cap 120 as described above. As described above, since the protrusion 111 of the inner pot 110 is fixed in a state of being accommodated in the hole 121 of the cap 120, the inner pot 110 and the cap 120 can be maintained in a firmly connected state. it can.

  In the hook 100 according to the present invention, the protrusions 111 are not formed into the protrusions 111 of the cap 120 after being formed artificially in the process of manufacturing the inner hook 110. More specifically, in order to manufacture the pot 100 according to the present invention, the inner pot 110 and the cap 120 are manufactured and then connected to each other. 111 is not separately formed.

  However, the projection 111 presses a part of the inner pot 110 into the hole 121 of the cap 120 due to a high pressure when the separately manufactured inner pot 110 and the cap 120 are connected at high temperature and high pressure. Rarely, it is formed during the process of completely fitting into the hole 121. As described above, the principle that the cap 120 and the inner hook 110 are more firmly coupled to each other by the protrusion 111 being fitted into the hole 121 is very similar to the riveting principle.

  On the other hand, the protrusions 111 protrude from the lower surface and the lower outer peripheral surface of the inner hook 110, respectively. Therefore, since the protrusions 111 project in different directions, the cap 120 is firmly connected and is not separated by an external force.

  As described above, the shuttle 100 according to the present invention is manufactured through the process of connecting the inner shuttle 110 and the cap 120 through the unique process as described above. Hereinafter, the method for manufacturing the induction heating heater of the present invention will be described in more detail with reference to FIGS. 5A to 5D.

  The method of manufacturing the pot according to the present invention includes four steps, that is, a step of forming the inner pot 110 and the cap 120, a step of preheating the inner pot 110 and the cap 120, and a step of connecting the inner pot 110 and the cap 120. Consists of stages.

  Here, as shown in FIG. 5A, the inner pot 110 has a cooking space 101 therein and an upper opening. In such an inner pot 110, the first plate is formed by, for example, drawing an aluminum plate. At this time, if necessary, the flange 115 shown in FIG. 3 is also formed, and the end of the flange 115 is cut and processed in a desired shape.

  And, as shown in FIG. 5B, the cap 120 is processed such that the inner surface has a shape corresponding to at least a part of the outer surface of the inner hook 110. At this time, the cap 120 is made of a magnetizable metal or a material having a high electric resistance, for example, a stainless material.

  After forming the hole 121 by perforating the flat second plate made of stainless steel or the like, the cap 120 is manufactured by plastically deforming the perforated stainless plate by pressing or the like.

  If the inner pot 110 and the cap 120 are respectively manufactured, as shown in FIG. 5C, after the cap 120 is disposed at the lower portion of the inner pot 110, for example, press working is performed to a predetermined temperature. Preheat to an easy temperature.

  Then, when the preheating of the inner pot 110 and the cap 120 is completed, the inner pot 110 and the cap 120 are squeezed and joined at a high temperature. Then, a part of the outer surface of the inner pot 110 is pressed into the hole 121 of the cap 120 by high pressure to form a protrusion 111, and the protrusion 111 is formed as shown in FIG. Will be completely fitted in. As described above, if the inner pot 110 and the cap 120 are cooled while the projections 111 of the inner pot 110 are accommodated in the holes 121 of the cap 120, the inner pot 110 and the cap 120 are as shown in FIG. It becomes one pot 100 completely with the integrated shape.

  When the inner pot 110 and the cap 120 are connected by the above-described method, the inner pot 110 and the cap 120 are not separated because the boundary between the inner pot 110 and the cap 120 is adhered to each other by high temperature and high pressure. Further, since the protrusion 111 of the inner hook 110 is kept in the state of being accommodated in the cap 120, the coupling force between the inner hook 110 and the cap 120 is improved. Also, since the direction in which the protrusion 111 protrudes is different, the cap 120 is firmly connected and the inner hook 110 and the cap 120 are not separated by an external force.

  The kettle 100 according to the present invention manufactured by the above method is used by being attached to an induction heating cooking appliance of the type shown in FIG. When an electric current is applied to the coil 4 when the induction heating cooking device is operated, a magnetic field formed around the coil 4 passes through a portion where the cap 120 is formed. Then, an eddy current flows through the cap 120, and the cap 120 is made of a material having high electric resistance, so that resistance heat is generated. The resistance heat generated from the cap 120 is transmitted to the inner pot 110 made of a material having a high thermal conductivity, and the heat transmitted to the inner pot 110 heats the food contained in the inner pot 110 to cook the food. I do.

  On the other hand, when the induction heating appliance further includes the first heater 5 or the second heater 6, the first and second heaters 5 and 6 assist the cooking by supplementarily heating food. After the cooking is completed, the first and second heaters 5 and 6 serve to keep the food warm.

  Alternatively, when the cover 2 is provided with a valve 8, the valve 8 discharges steam generated from food in the inner pot 110 during cooking to the outside. Therefore, the valve 8 can prevent an increase in the internal pressure of the induction heating cooker, thereby preventing a safety accident.

  The present invention has the following advantages.

  First, the inner pot and cap, which were separately manufactured, are pressed and manufactured without the complicated process of making the clad plate material and the process of further processing, so that the pot can be manufactured more easily than before. Can be.

  Second, since the cap is provided only at a portion necessary for induction heating, the weight of the kettle can be reduced as compared with the conventional one. In addition, since less expensive stainless steel material is used, manufacturing costs can be reduced.

  Third, since the hole of the cap can be manufactured in various shapes, not only can a beautiful appearance be obtained, but also the external design of the shuttle can be easily deformed.

  Fourth, since the outer surface of the inner pot is joined while being pressed into the hole of the cap by high temperature and pressure, it is not necessary to use a separate auxiliary material for bonding. In addition, the inner hook and the cap are very firmly connected by the projection and the hole.

  Although a preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made based on the technical idea of the present invention.

It is sectional drawing which showed the general induction heating cooking appliance. FIG. 2 is a sectional view showing a pot and a coil of the induction heating cooker of FIG. FIG. 2 is a perspective view illustrating a pot of the induction heating cooker according to the present invention. FIG. 4 is a cross-sectional view illustrating a partially enlarged view of the shuttle of FIG. 3. It is sectional drawing which showed a mode that the inner pot was manufactured. It is sectional drawing showing the mode that the cap was manufactured. FIG. 4 is a cross-sectional view showing a state in which an inner pot and a cap are opposed to each other for preheating. FIG. 4 is a cross-sectional view illustrating a pot according to the present invention manufactured by squeezing an inner pot and a cap at high temperature and pressure.

Explanation of reference numerals

100: pot 101: cooking space 110: inner pot 111: projection 115: flange 120: cap 121: hole

Claims (15)

An inner pot including a number of protrusions provided on a part of the outer surface,
A pot for an induction heating cooker, comprising a hole for accommodating the projection, and a cap made of a magnetizable metal material pressed on at least a part of an outer surface of the inner pot.   The pot of the induction heating cooker according to claim 1, wherein the cap is provided on a lower surface of the inner pot.   The pot of the induction heating cooker according to claim 1, wherein the cap is provided on a lower peripheral surface of the inner pot.   The pot of the induction heating cooker according to claim 1, wherein the cap is provided on an entire outer peripheral surface of the inner pot.   2. The induction heating cooker according to claim 1, wherein the inner pot is made of aluminum.   The pot of the induction heating cooker according to claim 1, wherein the cap is made of stainless steel. A case with a space inside and an open top,
A cover hingedly connected to the case to open and close an upper portion of the case;
An inner pot that includes a number of protrusions on a part of the outer surface,
A pot having a hole for accommodating the protrusion, a cap made of a magnetizable metal material squeezed on at least a part of an outer surface of the inner pot,
An induction heating cooker provided in the case, comprising a coil arranged to face the cap when the kettle is mounted.   The induction heating cooker according to claim 7, further comprising a heater provided at at least one of the case and the cover.   The induction heating cooker according to claim 7, further comprising a valve provided on the cover to discharge the internal steam of the inner pot to the outside.   The induction heating cooker according to claim 7, wherein the inner pot is made of aluminum.   The induction heating cooker according to claim 7, wherein the cap is made of stainless steel. (A) forming an inner pot having a cooking space and an opening at the inside and at the top, respectively;
(B) forming a cap having a shape corresponding to at least a part of the outer surface of the inner pot and having a number of holes;
(C) preheating the inner pot and the cap at a predetermined temperature;
And (d) squeezing the inner pot and the cap at a high temperature.   13. The method of claim 12, wherein the step (a) is performed by drawing the first plate. The step (b) includes:
Perforating a second plate to form the hole;
The method of claim 12, further comprising: plastically deforming the second plate having the hole formed therein.   The method according to claim 12, wherein the step (d) is performed until a part of the outer peripheral surface of the inner pot is pressed and fitted into the hole of the cap. .

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