TW201946580A - Cooking device - Google Patents

Abstract

The present invention relates to a cooker, which can effectively suppressing vibration of a ferrite core. The cooker (rice cooker (10)) includes a ferrite holder (25) disposed on an outer side of a pot accommodating portion (18). An annular coil (22) is held between the ferrite holder (25) and the pot accommodating portion (18). The ferrite holder (25) includes a ferrite accommodating portion (27) for accommodating and holding a ferrite core (24). The ferrite accommodating portion (27) includes: a pair of side pates (29) disposed on both sides of the ferrite core (24); a connecting portion (30) for connecting the pair of side plates (29); an insertion opening (21) arranged at an end of the side plate in a longitudinal direction; an elastic piece (34b) that elastically urges the ferrite core (24) toward the connecting portion (30); and a restriction portion (35b) that restricts elastic deformation of the elastic piece (34b).

Description

Cooker

The invention relates to a cooking device.

A cooking device is known in which a coil for inductively heating a pot and a ferrite holder containing a ferrite core are arranged outside the pot accommodating portion. The ferrite holder described in Patent Document 1 includes a groove-shaped ferrite storage portion having a pair of side plates. The ferrite receiving section includes a receiving section provided inside the ferrite receiving section where the coil is located, and a spring section provided outside the ferrite receiving section located away from the coil. A ferrite core is elastically held between the receiving portion and the spring portion.

Prior art literature

Patent literature

Patent Document 1: Japanese Patent Application Laid-Open No. 2005-27965

In view of this, our inventors are concentrating on further research and proceeding with research and development and improvement, with a better design to solve the above problems, and the invention came out after continuous testing and modification.

Problems to be Solved by the Invention

In such a cooker, when a high-frequency magnetic field is generated due to energization of a coil, the ferrite core may vibrate finely and generate abnormal noise. However, in the cooker of Patent Document 1, the countermeasure against vibration of the ferrite core is insufficient.

An object of the present invention is to provide a cooker capable of effectively suppressing vibration of a ferrite core.

Means to solve the problem

According to one aspect of the present invention, there is provided a cooking device including: a bottomed cylindrical pot storage portion; and a ferrite holder disposed outside the pot storage portion and held between the pot storage portion and the pot storage portion. An annular coil, and the ferrite holder has a ferrite storage portion that holds and holds a columnar ferrite core, and the ferrite storage portion is provided with an insertion port for the ferrite A bulk magnetic core is inserted; and an elastic sheet is provided on the pot receiving portion side and elastically applies force to the ferrite core, the elastic piece has a restricting portion, and the restricting portion is connected with the pot by The abutment of the receiving portion or the coil restricts the elastic deformation of the elastic piece.

According to this cooking device, the restricting portion is brought into contact with the pot accommodating portion or the coil, so that the elastic deformation of the elastic sheet can be restricted. This makes it possible to effectively suppress the movement of the ferrite core in the ferrite storage portion by the elastic sheet. Therefore, it is possible to effectively prevent the ferrite core from vibrating due to the high-frequency magnetic field generated by the energization of the coil. As a result, it is possible to reliably prevent the occurrence of unexpected noise from the ferrite core.

The insertion port is provided at one end side in the longitudinal direction of the ferrite container, and the elastic sheet includes a first elastic sheet that faces from the insertion port from the one end side where the insertion port is formed. The opposite other end side extends; and a second elastic sheet extends from the other end side toward the one end side in a manner opposed to the first elastic sheet, and the restricting portion is provided on the first elastic side An opposing portion of the sheet is opposite to the second elastic sheet, and protrudes toward the coil. According to this aspect, while suppressing the vibration of the ferrite core, the ferrite core can be stored in the ferrite storage portion in a stable state.

The restricting portion provided on the second elastic piece is inclined in a direction approaching the insertion port. According to this aspect, when the ferrite core is placed in the ferrite receiving portion from the insertion port, if the ferrite core collides with the restricting portion, the elastic sheet is elastically deformed by the inclination of the restricting portion. Therefore, the operability of disposing the ferrite core in the ferrite storage portion can be improved. In addition, when the restricting portion abuts on the coil due to the deformation of the elastic piece, at least one of the elastic piece and the restricting portion is deformed in a direction in which the inclination angle of the restricting portion with respect to the elastic piece increases, so that the restricting portion can be restrained against the coil Damage.

The insertion port is provided with a stopper that prevents the ferrite core inserted from coming out. According to this aspect, it is possible to effectively prevent the ferrite core from coming out of the ferrite storage portion. Therefore, the ferrite core can be handled as a component pre-assembled in the ferrite holder. As a result, the assemblability of a cooking appliance can be improved.

The thickness from the outer surface to the inner surface of the ferrite core has a predetermined allowable error, and the ferrite core having the smallest size within the allowable error is inserted into the ferrite from the insertion opening. In a state where the elastic piece is most deformed by the ferrite core in the accommodation portion, the gap between the outer surface of the pot accommodation portion or the coil and the restriction portion is zero. Here, a zero gap means a state where the restricting portion is in contact with the outer surface of the coil. When the coil is not arranged, the tip of the restricting portion is located in the ferrite housing beyond the imaginary surface of the outer surface of the coil. Department side status. According to this aspect, it is possible to effectively suppress the vibration of the ferrite core while ensuring the assemblability of the ferrite core.

The cooker includes a reflecting plate that is disposed outside the ferrite holder and has a shape that covers the coil when viewed from a direction extending from the axis of the pot receiving portion, and the ferrite A plurality of body accommodating portions are provided so as to protrude radially with a center of the coil as a center, and at least one space between a plurality of adjacent ferrite accommodating portions is provided with A supporting plate with a contour corresponding to the shape of the reflecting plate. According to this aspect, since the reflection plate is in contact with the support plate, it is possible to effectively suppress the reflection plate from vibrating due to the high-frequency magnetic field generated by the energization of the coil. As a result, it is possible to reliably prevent the occurrence of undesired abnormal noise from the reflecting plate. In addition, it is possible to prevent the hand of the operator and the lead of the coil from hitting the edge of the reflecting plate by the support plate. Therefore, it is possible to effectively prevent injury to the operator and damage to the lead.

The ferrite holder includes: a first screw fixing portion that is fixed to the pot receiving portion; a second screw fixing portion that is fixed to the pot receiving portion together with the reflection plate; and a third screw fixing Part, which fixes the reflecting plate. According to this aspect, by disposing the ferrite holder on the outside of the coil disposed in the pot accommodating portion and screwing the first screw fixing portion, the coil and the ferrite holder can be fixed on the outside of the pot accommodating portion. By arranging the lead wires of the coil in a state where the reflecting plate is not disposed, it is possible to effectively prevent the operator from being injured by the reflecting plate and the lead wire from being damaged. Thereafter, by placing the reflecting plate on the outside of the ferrite holder and screwing the second screw fixing portion, the ferrite holder and the reflecting plate can be fixed to the pot accommodating portion. Finally, the third screw fixing portion is screwed to fix the ferrite holder and the reflecting plate.

Invention effect

In the cooking device of the present invention, the elastic deformation of the elastic sheet can be restricted by the contact between the restricting portion and the pan accommodating portion or the coil, and thus the movement of the ferrite core in the ferrite accommodating portion can be effectively suppressed. Therefore, it is possible to effectively suppress the vibration of the ferrite core caused by the high-frequency magnetic field generated by the energization of the coil, thereby preventing the occurrence of unexpected noise.

Regarding the technical means of our inventors, several preferred embodiments are described in detail below in conjunction with the drawings, for the purpose of understanding and agreeing with the present invention.

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

(Outline of rice cooker)

1 and 2 show a rice cooker 10 as an example of a cooking device according to an embodiment of the present invention. The rice cooker 10 includes a rice cooker main body 14 in which a rice cooker 12 is detachably disposed, and a cover 55 that is removably attached to the rice cooker main body 14.

As shown in FIGS. 1 and 2, the rice cooker 12 has a bottomed cylindrical shape, and includes a circular plate-shaped bottom portion 12 a, a cylindrical outer peripheral portion 12 b, and a continuous bent portion 12 c. The rice cooker 12 is made of a magnetic material and has an integrated structure in which a bottom portion 12a, an outer peripheral portion 12b, and a bent portion 12c are formed by press working or casting.

The rice cooker main body 14 includes a main body exterior 15 having an upper end opened, and a shoulder body 16 that closes the opening of the main body exterior 15. A hinge connection portion 17 is rotatably mounted on the back of the shoulder body 16 to cover the body 55. The rice cooker main body 14 includes a pot accommodating portion 18 detachably accommodating the rice cooking pot 12. The pot accommodating portion 18 has a bottomed cylindrical shape, and includes a metal inner case 19 formed in a cylindrical shape, and a protective frame 20 made of a resin (non-conductive material) formed in a tray shape. The pot accommodating portion 18 is disposed. On the lower part of the opening of the shoulder body 16.

A coil 22 for inductively heating the rice cooking pot 12 is disposed outside the protective frame 20. 3 and 4, in the present embodiment, three coils 22 are arranged at intervals in the circumferential direction of the protective frame 20. A ferrite holder 25 is arranged outside each coil 22, and the coil 22 is held between the ferrite holder 25 and the protective frame 20. A reflecting plate 45 is disposed outside each of the ferrite holders 25. The reflecting plate 45 prevents a high-frequency magnetic field from leaking to the outside of the rice cooker body 14. In addition, FIG. 4 shows that the ferrite holder 25 and the reflection plate 45 are arranged in one of the three coils 22, and only the ferrite holder 25 is arranged in the other, and ferrite is not arranged in the remaining one. The body holder 25 is also in a state where the reflection plate 45 is not disposed.

As shown in FIGS. 1 and 2, the cover body 55 includes a cover body 56 in a plan view shape that covers the upper surface of the shoulder body 16, and a cover exterior body 57 that covers the upper portion of the cover body 56. The cover main body 56 is rotatably attached to the hinge connection portion 17. An inner lid 58 is provided on the inner side of the lid main body 56 facing the rice cooker 12 to close the opening at the upper end of the rice cooker 12. With respect to the cover body 55, the inner cover 58 may be detachably or detachably disposed.

Referring to FIG. 3, the cover 55 is provided with an operation panel portion 59 having a plurality of operation buttons 60 and a liquid crystal panel (display portion) 61. The plurality of operation buttons 60 include a rice cooking button to start the rice cooking process, a heat preservation button to start the heat preservation process, and a cancel button to end the rice cooking process and the heat preservation process. According to an instruction from the control unit, the liquid crystal panel 61 displays a selection state of the rice cooking menu and a current working state.

Referring to FIGS. 3 and 4, a control board 52 is disposed in the rice cooker main body 14 so as to be located between the main body exterior body 15 and the pot accommodating portion 18. The control board 52 is provided with a control unit (not shown) that controls electrical components including the coil 22. The control unit is constituted by a single or multiple microcomputers and other electronic devices. The control unit controls the energization of the coil 22 based on a detection result of a temperature sensor (not shown) to perform a rice cooking process and a heat preservation process.

When the coil 22 is energized, the reflective plate 45 and the ferrite core 24 in the ferrite holder 25 may vibrate finely due to the high-frequency magnetic field generated by the coil 22 and generate abnormal noise. To eliminate this problem, in the present embodiment, the ferrite holder 25 is provided with a structure that suppresses vibration of the ferrite core 24 and the reflection plate 45. Hereinafter, the coil 22, the ferrite holder 25, and the reflection plate 45 will be described in more detail.

(Coil holding structure of ferrite holder)

As shown in FIGS. 4 to 6, the coil 22 has a plurality of windings wound into an elliptical ring shape, and an eddy current is generated by applying a high-frequency current, thereby inductively heating the rice cooker 12. As best shown in FIG. 4, when viewed from a direction extending from the axis A of the protective frame 20, the coils 22 are arranged at intervals in the circumferential direction around the axis A of the protective frame 20. Referring to FIGS. 1 and 5, each coil 22 is disposed outside the protective frame 20 with the bent portion 12 c of the rice cooker 12 as a center extending from the bottom 12 a to the outer peripheral portion 12 b. The bottom wall portion 20b of the protective frame 20 corresponds to the bottom portion 12a of the rice cooker 12, the curved wall portion 20c of the protective frame 20 corresponds to the curved portion 12c of the rice cooker 12, and the side wall portion 20d of the protective frame 20 corresponds to the cooking portion. The outer peripheral part 12b of the rice cooker 12 corresponds.

Each coil 22 includes a pair of leads 22a. The lead 22 a of one coil 22 located on the lower side in FIG. 4 is connected to the control substrate 52. The leads 22 a of the two coils 22 located on the upper side in FIG. 4 are connected to the relay substrate 53, and the relay substrate 53 is arranged in the holder portion 20 a of the protective frame 20. Any one of the three coils 22 is energized by the control unit, and energization to the remaining two coils is cut off. In addition, the three coils 22 are switched in an energized state in a predetermined order every predetermined time.

In general, in Japan, it is often the case that the power distribution board installed in the home is 20 amps and the socket is 15 amps. In electrical equipment including this rice cooker 10, the maximum rated power that can be input per unit time is 1500W . In the case of a rice cooker using one coil covering the entire bottom wall portion 20b, the entire bottom portion 12a of the rice cooker 12 is induction-heated with a heating amount corresponding to the rated power. On the other hand, in the rice cooker 10 of this embodiment, since the rated power is input to one of the three coils 22, the area corresponding to 1/3 of the corresponding rice cooker 12 is concentrated with a heating amount corresponding to the rated power. Perform induction heating. Therefore, the rice cooker 10 of this embodiment can increase the maximum heating amount per unit area of the rice cooker 12 compared with the rice cooker using one coil.

As shown in FIGS. 4 to 6, the ferrite holder 25 is provided for each coil 22 and is disposed on the side opposite to the protective frame 20 with respect to the coil 22. The ferrite holder 25 includes a plurality of ferrite accommodating portions 27 that accommodate and hold the ferrite core 24. The ferrite core 24 converges the magnetic flux from the coil 22. In the present embodiment, four ferrite housing portions (hereinafter, abbreviated as “receiving portions”) 27 are provided in a radial shape protruding from the center of the coil 22 so as to have a substantially cross shape in a plan view. In addition, in the following description, the four accommodating portions 27 may be distinguished as necessary, and they are referred to as a first accommodating portion 27A to a fourth accommodating portion 27D.

The first storage portion 27A extends in the radial direction along the bottom wall portion 20 b from the vicinity of the axis A of the protective frame 20. Referring to FIG. 4, the outer end of the first housing portion 27A located radially outward of the protective frame 20 constitutes a base portion (center portion) 26 of the ferrite holder 25. The base portion 26 is located directly below the center of the coil 22 of the curved wall portion 20 c of the protective frame 20. The top end (inner end) 28 of the first housing portion 27A that is radially inward of the protective frame 20 is located at the top in the short-diameter direction of the coil 22.

The second storage portion 27B extends from the base portion 26 along the side wall portion 20 d of the protective frame 20. The second storage portion 27B is inclined so as to gradually expand outward in the radial direction of the protective frame 20 as it goes upward along the axis A of the protective frame 20. Referring to FIGS. 4 and 5, the top end (upper end) 28 of the second storage portion 27B located away from the base portion 26 is a coil located on the opposite side of the top end 28 of the first storage portion 27A in the short-axis direction of the coil 22 22 on the top.

The third storage portion 27C and the fourth storage portion 27D protrude from the base portion 26 in a direction crossing the first storage portion 27A. The third storage portion 27C and the fourth storage portion 27D extend along the curved wall portion 20 c in the circumferential direction of the protective frame 20. The top end 28 of the third receiving portion 27C located at a position remote from the base portion 26 is located at one top in the longitudinal direction of the coil 22, and the top end 28 of the fourth receiving portion 27D located at a position remote from the base portion 26 is located at the other in the long diameter direction of the coil 22. A top.

In this way, the short-axis direction of the coil 22 is positioned by the first storage portion 27A and the second storage portion 27B, and the long-axis direction of the coil 22 is positioned by the third storage portion 27C and the fourth storage portion 27D.

(Ferrite core mounting structure of ferrite cage)

As shown in FIG. 5, the accommodating portion 27 is provided at a predetermined interval from the coil 22 to prevent the ferrite core 24 from contacting the coil 22. As shown in FIGS. 7 and 8, each of the accommodating portions 27 has a groove shape in which a rectangular parallelepiped ferrite core 24 is accommodated, and a pair of side plates 29 each include an outer connecting portion (connecting portion) 30 and an inner connecting portion 31 a. In addition, the storage sections 27A, 27C, and 27D other than the second storage section 27B include elastic pieces 34a and 34b and restriction sections 35a and 35b. The second storage portion 27B includes an elastic piece 37 different from the elastic pieces 34a and 34b.

The pair of side plates 29 has: an inner edge 29a extending along the outer wall of the protective frame 20, that is, along the bottom wall portion 20b, the curved wall portion 20c, and the side wall portion 20d; and an outer edge 29b located outside the inner edge 29a. The opposite side plate 29 is arranged in a direction orthogonal to the protective frame 20. A pair of side plates 29 are opposed to each other. One of the side plates 29 covers one side surface 24 a of the ferrite core 24, and the other side plate 29 covers the other side surface 24 a of the ferrite core 24. The side plates 29 of the first storage portion 27A and the second storage portion 27B are configured by a continuous flat plate. A pair of side plates 29 of the third storage portion 27C protrude from one of the pair of side plates 29 of the first storage portion 27A, respectively. A pair of side plates 29 of the fourth storage portion 27D protrude from the other of the pair of side plates 29 of the first storage portion 27A, respectively.

As shown most clearly in FIG. 7, the outer connecting portion 30 is provided on the outer edge 29 b side of the side plate 29 and connects the pair of side plates 29. The outer connection portion 30 of the first storage portion 27A, the third storage portion 27C, and the fourth storage portion 27D is provided at the center in the longitudinal direction of the side plate 29. The outer connecting portion 30 of the second housing portion 27B is provided at the distal end 28 of the side plate 29 in the longitudinal direction. The outer connection portion 30 includes a plate-shaped contact piece 30 a extending along the outer edge 29 b of the side plate 29 and protruding into the accommodation portion 27. In addition, in the center of the second storage portion 27B in the longitudinal direction, in addition to the contact piece 30 a, a plate-shaped contact piece 30 b extending along the outer edge 29 b of the side plate 29 and protruding into the storage portion 27 is provided. . The gap between the pair of contact pieces 30a and the gap between the pair of contact pieces 30b are smaller than the size between the pair of side surfaces 24a, that is, the width of the ferrite core 24. Referring to FIG. 5, at the end portions in the longitudinal direction of the contact pieces 30 a and 30 b, a protruding portion 30 c having a semicircular cross-section protruding toward the inside (the protective frame 20) is provided.

As shown most clearly in FIG. 8, the inner connecting portion 31 a is provided on the inner edge 29 a side of the side plate 29 and connects the pair of side plates 29. The inner connecting portion 31 a is provided at a distal end 28 of the receiving portion 27. In addition, a second inner connecting portion 31b connecting a pair of side plates 29 is also provided on the base portion 26 side of the first receiving portion 27A and the second receiving portion 27B. The base 26 side of the third storage portion 27C and the fourth storage portion 27D are connected by a side plate 29 of the first storage portion 27A.

A cylindrical accommodation portion 27 is defined by the pair of side plates 29, the outer connection portion 30, and the inner connection portion 31a. The top end (one end) 28 of each accommodating portion 27 is an insertion opening 32 into which the ferrite core 24 is inserted. As shown in FIG. 5, in order to position the end portion of the ferrite core 24 in the direction in which the ferrite core 24 is inserted, an end plate 33 a is provided on the base portion 26 side of the first accommodation portion 27A, An end plate 33b is provided on the base portion 26 side of the storage portion 27B. The end plate 33a is continuous with the inner connecting portion 31b of the first storage portion 27A and the pair of side plates 29. The end plate 33b is continuous with the pair of side plates 29 of the end plate 33a and the second accommodation portion 27B. In the third storage portion 27C and the fourth storage portion 27D, the positioning of the end portion of the ferrite core 24 is performed by the side plate 29 of the first storage portion 27A.

As shown in FIGS. 5 and 8, the elastic pieces 34 a and 34 b elastically elastically face the ferrite core 24 accommodated in the first accommodation portion 27A, the third accommodation portion 27C, and the fourth accommodation portion 27D toward the outer connection portion 30. Exert force. The elastic pieces 34 a and 34 b are adjacent to each other in the length direction of the accommodating portions 27A, 27C, and 27D (side plates 29), and extend to face each other. The first elastic sheet 34 a projects from the insertion port 32 toward the base portion 26, and the second elastic sheet 34 b projects from the base portion 26 toward the insertion port 32. The first elastic piece 34a is integrally provided on the inner connecting portion 31a. The second elastic piece 34b of the first accommodation portion 27A is integrally provided on the inner connecting portion 31b, and the second elastic piece 34b of the third accommodation portion 27C and the fourth accommodation portion 27D are integrally provided on the side plate 29 of the first accommodation portion 27A.

The restricting portions 35 a and 35 b are in contact with the coil 22 to restrict the elastic deformation of the elastic pieces 34 a and 34 b toward the coil 22. Alternatively, instead of the coil 22, the restricting portions 35 a and 35 b may be brought into contact with the protective frame 20. The restriction portions 35 a and 35 b are integrally provided on the elastic pieces 34 a and 34 b and protrude toward the protection frame 20. The restricting portions 35a and 35b are provided on the opposing portions of the pair of elastic pieces 34a and 34b so as to be located at the central portions of the accommodating portions 27A, 27C, and 27D, that is, on the top ends of the elastic pieces 34a and 34b.

The first restricting portion 35 a of the first elastic piece 34 a is inclined in a direction approaching the second elastic piece 34 b (the base portion 26). The second restricting portion 35b of the second elastic piece 34b is inclined in a direction approaching the first elastic piece 34a (the insertion port 32). That is, the inclination angles α and β of the restricting portions 35 a and 35 b with respect to the elastic pieces 34 a and 34 b are obtuse angles. As best shown in FIG. 5, the inclination angle β of the second restricting portion 35 b with respect to the second elastic piece 34 b is larger than the inclination angle α of the first restricting portion 35 a with respect to the first elastic piece 34 a. In addition, chamfered portions 36a and 36b are provided between the elastic pieces 34a and 34b and the restricting portions 35a and 35b, respectively. When the ferrite core 24 having a predetermined thickness T without an error is arranged, the chamfered portions 36 a and 36 b are in surface contact with the ferrite core 24.

As shown in FIGS. 5 and 8, the elastic piece 37 of the second storage portion 27B elastically biases the ferrite core 24 stored in the second storage portion 27B toward the outer connection portion 30. The elastic sheet 37 is provided so as to extend in the longitudinal direction of the second storage portion 27B. One end of the elastic piece 37 is continuous with the inner connecting portion 31 a on the tip 28 side, and the other end of the elastic piece 37 is continuous with the inner connecting portion 31 b on the base 26 side. An intermediate portion of the elastic piece 37 is provided with an inclined portion 37 a that is inclined toward the outer connecting portion 30.

As shown in FIGS. 5 and 7, a stopper 38 is provided in the insertion port 32 of the accommodating portion 27A, 27C, 27D to prevent the ferrite core 24 disposed therein from coming out. The stopper 38 of the first storage portion 27A is continuous with the inner connecting portion 31 a and the pair of side plates 29. The stopper 38 of the third storage portion 27C and the fourth storage portion 27D is continuous with one of the inner connecting portion 31 a and the pair of side plates 29. Each stopper 38 protrudes outward from the inner connection portion 31a. The size of the projection of the stopper 38 is approximately half of the width of the side plate 29 from the inner edge 29 a to the outer edge 29 b.

The stopper of the ferrite core 24 stored in the second storage portion 27B is not provided on the ferrite holder 25. As shown in FIG. 5 and FIG. 6, the stopper 20 e of the ferrite core 24 of the second housing portion 27B is configured by a protruding portion having a T-shape in plan view protruding from the protective frame 20. On the outside of the stopper 20e in the radial direction of the protective frame 20, a support portion 20f that supports the outside of the second accommodation portion 27B is provided.

FIG. 9 is a cross-sectional view showing the relationship between the elastic pieces 34 a and 34 b and the second restricting portion 35 b of the accommodating portions 27A, 27C, and 27D and the ferrite core 24. The width and thickness T of the ferrite core 24 are predetermined as specifications. The width of the ferrite core 24 is a size between the pair of side surfaces 24a. The thickness T of the ferrite core 24 is a dimension from the outer surface 24b to the inner surface 24c. The thickness T includes an allowable error (tolerance) ΔT. For example, the tolerance ΔT is ± 0.3 mm of a predetermined size.

As shown by the dotted line in FIG. 9, among the accommodating portions 27A, 27C, and 27D where the ferrite core 24 is not yet arranged, the gap S1 ratio between the elastic pieces 34 a and 34 b and the protruding portion 30 c (abutting piece 30 a) is the smallest The thickness Tmin of the sized ferrite core 24 is small. The gap between the elastic piece 37 (inclined portion 37 a) of the second storage portion 27B and the contact pieces 30 a and 30 b is also set to be the same as that of the elastic pieces 34 a and 34 b.

In the accommodating portions 27A, 27C, and 27D in which the stopper 38 is provided, it is necessary to insert the ferrite core 24 obliquely from the insertion port 32 as shown in FIG. 9. In other words, in the accommodating portions 27A, 27C, and 27D, an insertion portion is formed by an end portion of the contact piece 30a located on the distal end 28 side, a distal end of the stopper 38, and an outer edge 29b of the pair of side plates 29 Mouth 32.

As shown by the dashed line in FIG. 9, in the accommodating portions 27A, 27C, and 27D where the ferrite core 24 has not been disposed, the gap between the second restricting portion 35 b of the second elastic piece 34 b and the outer surface 22 b of the coil 22 S2 is set as follows. As shown by the solid line in FIG. 9, in a state where the ferrite core 24 having a thickness Tmin is inserted from the insertion port 32 and the elastic piece 34 b is deformed the most by the contact of the ferrite core 24, the gap S2 becomes Zero way setting. A gap S2 of zero means a state where the second restricting portion 35b is in contact with the outer surface 22b of the coil 22. When the coil 22 is not disposed, the imaginary plane where the tip of the second restricting portion 35b crosses the outer surface 22b is located. On the other hand, the protection frame 20 is located.

In this rice cooker 10, the restricting portions 35a and 35b are in contact with the coil 22, so that the elastic deformation of the elastic pieces 34a and 34b can be restricted. Accordingly, the elastic pieces 34 a and 34 b can suppress the movement of the ferrite core 24 in the accommodation portion 27. Therefore, it is possible to effectively suppress the vibration of the ferrite core 24 caused by the generation of a high-frequency magnetic field due to the energization of the coil 22. As a result, it is possible to reliably prevent the occurrence of unexpected noise from the ferrite core 24.

A pair of elastic pieces 34 a and 34 b are provided adjacent to each other in the longitudinal direction of the accommodating portion 27, and restricting portions 35 a and 35 b are provided at their opposing portions. Therefore, while suppressing the vibration of the ferrite core 24 by the pair of elastic pieces 34a and 34b, the ferrite core 24 can be stored in the storage portion 27 in a stable state.

The second restricting portion 35 b provided in the second elastic piece 34 b is inclined in a direction approaching the insertion opening 32. Therefore, when the ferrite core 24 is placed in the receiving portion 27 from the insertion port 32, if the ferrite core 24 collides with the second restricting portion 35b, the second elastic piece 34b will be caused by the second restricting portion. The inclination of 35b is elastically deformed. As a result, the operability of disposing the ferrite core 24 in the storage portion 27 can be improved. In addition, when the second restricting portion 35b is in contact with the coil 22 due to the deformation of the second elastic piece 34b, at least one of the second elastic piece 34b and the second restricting portion 35b faces the second restricting portion 35b with respect to the second The direction in which the inclination angle β of the elastic piece 34b is enlarged is deformed. Therefore, damage to the coil 22 by the second restricting portion 35b can be suppressed.

Since the stopper 38 is provided in the insertion opening 32, it is possible to effectively prevent the ferrite core 24 from coming out of the storage portion 27. Therefore, the ferrite core 24 can be handled as a component previously assembled in the ferrite holder 25. As a result, the assemblability of the rice cooker 10 can be improved.

When the ferrite core 24 having a thickness Tmin is inserted into the receiving portion 27 from the insertion opening 32, the second restricting portion 35b is in contact with the outer surface 22b of the coil 22 so that the gap S2 becomes zero. . Therefore, while ensuring the assemblability of the ferrite core 24, vibration and detachment of the ferrite core 24 can be effectively suppressed.

(Reflective plate supporting structure of ferrite holder)

As shown in FIGS. 7 and 8, a reflecting plate 45 is arranged outside the ferrite holder 25. The reflection plate 45 includes a bottom plate portion 46, a side plate portion 47, and a step portion 48. The ferrite holder 25 supports the bottom plate portion 46 through the first storage portion 27A, the third storage portion 27C, and the fourth storage portion 27D, and supports the side plate portion 47 through the second storage portion 27B. In order to suppress the vibration of the bottom plate portion 46 having a large area, a support plate 39 is provided in the ferrite holder 25 of the present embodiment.

Specifically, the reflecting plate 45 is an integrated structure formed by pressing a single metal plate. For example, the material of the reflecting plate 45 is copper or aluminum having a lower resistance value than the rice cooker 12. Referring to FIG. 4 together, when viewed from a direction extending from the axis A of the protective frame 20, the reflecting plate 45 has a substantially elliptical shape covering the coil 22.

The bottom plate portion 46 is arranged on the outside of the first storage portion 27A, the third storage portion 27C, and the fourth storage portion 27D of the ferrite holder 25 in an overlapping manner. The outer peripheral portion 46 a of the bottom plate portion 46 has a semi-elliptical shape having a curvature substantially the same as the curvature between both ends in the longitudinal direction of the coil 22.

The side plate portion 47 is continuous with the bottom plate portion 46 via a step portion 48. The side plate portion 47 as a whole is curved with respect to the bottom plate portion 46 and is superposed on the outside of the second accommodation portion 27B of the ferrite holder 25. The outer peripheral portion 47 a of the side plate portion 47 has a semi-elliptical shape having a curvature substantially the same as the curvature between both ends in the longitudinal direction of the coil 22. A part of the outer peripheral portion 47a of the side plate portion 47 is provided with a notch 47b in an arc shape so as to avoid interference with other components in an assembled state.

The step portion 48 is a depression for avoiding interference from other parts in the assembled state. The step portion 48 includes a first portion 48 a continuous to the bottom plate portion 46 and a second portion 48 b continuous to the side plate portion 47. The first portion 48a is curved with respect to the bottom plate portion 46 and is disposed outside the third storage portion 27C and the fourth storage portion 27D of the ferrite holder 25, respectively. The second portion 48b is curved with respect to the side plate portion 47 and the first portion 48a, and extends from the third receiving portion 27C and the fourth receiving portion 27D to the outside of the second receiving portion 27B, respectively.

The reflection plate 45 is formed with four through holes 49a to 49d. The first through hole 49 a is provided in the bottom plate portion 46. The second through hole 49 b is provided from the side plate portion 47 to the step portion 48. The third through-hole 49c and the fourth through-hole 49d are provided from the second portions 48b on both sides of the second through-hole 49b to the bottom plate portion 46. These through-holes 49 a to 49 d are provided to allow the wind of the blower fan 54 (see FIG. 4) to pass and cool the coil 22. In addition, the second through-hole 49b has a function of protruding a part of the second accommodation portion 27B and the screw fixing portions 40 to 42 described later.

Next, as shown in FIGS. 7 and 8, the ferrite holder 25 is provided between the first storage section 27A and the third storage section 27C and between the first storage section 27A and the fourth storage section 27D. The bottom plate portion 46 is in contact with the support plate 39. The support plate 39 has a contour (outer peripheral portion 39 a) corresponding to the shape of the outer peripheral portion 46 a of the bottom plate portion 46 of the reflection plate 45. Specifically, as shown in FIG. 4, the curvature of the outer peripheral portion 39 a of the support plate 39 is the same as the curvature of the outer peripheral portion 46 a of the reflection plate 45 when viewed from a direction extending from the axis A of the protective frame 20.

The outer peripheral portion 39 a of the support plate 39 is chamfered into a semicircular shape, and the semicircular portion protrudes from the outer peripheral portion 46 a of the bottom plate portion 46. The outer surface of the support plate 39 is a flat surface flush with the outer edge 29b of the side plate 29 of the receiving portions 27A, 27C, and 27D, and the bottom plate portion 46 of the reflection plate 45 is in contact with the outer surface.

In this way, since the ferrite holder 25 includes the support plate 39 that is in contact with the bottom plate portion 46 of the reflection plate 45, it is possible to effectively suppress the reflection plate 45 (bottom plate) from being generated by the generation of a high-frequency magnetic field due to the current applied to the coil 22. Section 46) When vibration occurs. As a result, it is possible to reliably prevent the occurrence of unexpected noise from the bottom plate portion 46.

In addition, as shown in FIG. 4, the leads 22 a of the coils 22 are arranged through a narrow gap between the adjacent coils 22. At this time, when the operator's hand touches the outer peripheral portion 46a of the thin reflecting plate 45, the operator may be injured. In addition, when the lead 22a hits the outer peripheral portion 46a, the lead 22a is damaged. However, in this embodiment, since the support plate 39 provided with the outer peripheral part 39a corresponding to the shape of the outer peripheral part 46a is provided, the said problem can be prevented effectively.

(Fixed structure of ferrite cage)

As shown in FIGS. 6 to 8, the ferrite holder 25 includes screw fixing portions 40 to 42 for fixing. The first screw fixing portion 40 is provided for fixing only the ferrite holder 25 to the protective frame 20. The second screw fixing portion 41 is provided for fixing the ferrite holder 25 together with the reflection plate 45 to the protective frame 20. The third screw fixing portion 42 is provided for fixing the reflection plate 45 to the ferrite holder 25.

The first screw fixing portion 40 is provided at a portion where the first receiving portion 27A and the third receiving portion 27C intersect. The first screw fixing portion 40 includes a recessed portion that can receive a head of a screw (not shown), and a through hole through which the screw passes. A portion of the protective frame 20 directly above the first screw fixing portion 40 is provided with a protruding portion 20 g of a fastening screw.

The second screw fixing portion 41 is provided at a portion where the first receiving portion 27A and the fourth receiving portion 27D intersect. The second screw fixing portion 41 includes a through hole through which a screw (not shown) is passed. A convex portion 20 h of a fastening screw is provided at a portion of the protective frame 20 directly above the second screw fixing portion 41. The reflecting plate 45 includes a protruding piece 50 protruding from the bottom plate portion 46 toward the side plate portion 47. A portion of the protruding piece 50 directly below the second screw fixing portion 41 is provided with a screw hole 50 a through which a screw passes.

The third screw fixing portion 42 is provided on the side plate 29 of the third receiving portion 27C so as to be adjacent to the first screw fixing portion 40. The third screw fixing portion 42 is configured by a convex portion of a fastening screw (not shown). A portion of the protruding piece 50 of the reflecting plate 45 immediately below the third screw fixing portion 42 is provided with a screw hole 50 b through which a screw passes.

In addition, referring to FIGS. 4 and 6, the protection frame 20 is provided with a pair of positioning protrusions 20 i that position the top of the inner circumference in the longitudinal direction of the coil 22. In addition, referring to FIGS. 7 and 8, the protruding piece 50 of the reflecting plate 45 is provided with a locking piece 50 c that is locked to the outside of the first screw fixing portion 40 and the second screw fixing portion 41.

Next, an operation of attaching the coil 22, the ferrite holder 25, and the reflection plate 45 to the protective frame 20 will be described.

The three coils 22 are arranged outside the protective frame 20 so that the convex portions 20 g and 20 h are located on the inner peripheral portion of the coil 22. Then, the coil 22 is positioned in a predetermined direction by the positioning protrusion 20i.

Next, the ferrite holder 25 containing the ferrite core 24 is arranged outside the coil 22, and the first screw fixing portion 40 is screwed to the convex portion 20 g. Thus, the ferrite holder 25 is pre-fixed to the outside of the protective frame 20, and the coil 22 can be held at a predetermined position. In a state where the reflecting plate 45 is not disposed, the leads 22 a of the coil 22 are arranged at predetermined positions.

Next, the reflecting plate 45 is arranged outside the ferrite holder 25, and the second screw fixing portion 41 of the ferrite holder 25 and the protruding piece 50 (threaded hole 50a) of the reflecting plate 45 are screwed together to protect The convex portion 20h of the frame 20. Accordingly, while the ferrite holder 25 is completely fixed to the protective frame 20, the reflection plate 45 is pre-fixed to the protective frame 20.

Finally, the projecting piece 50 (the screw hole 50 b) of the reflecting plate 45 is screwed to the third screw fixing portion 42 of the ferrite holder 25. Thereby, the reflection plate 45 is completely fixed to the protective frame 20 and the ferrite holder 25.

As described above, the ferrite holder 25 includes three types of screw fixing portions 40 to 42, and the arrangement of the leads 22 a of the coil 22 can be performed without the reflection plate 45 being disposed on the protective frame 20. Therefore, it is possible to effectively prevent the operator from being injured by the reflecting plate 45 and the lead 22a from being damaged.

(Fuse mounting structure of ferrite cage)

As shown in FIG. 8, the ferrite holder 25 includes a placement section 43 for placing a temperature fuse 44. The arrangement section 43 is provided in the third storage section 27C and the fourth storage section 27D so as to be adjacent to each other in the direction in which the first storage section 27A protrudes. Only one of the two placement sections 43 is provided with a temperature fuse 44. The temperature fuses 44 arranged in all the ferrite holders 25 are connected in series and are electrically connected to the control substrate 52. The temperature fuses 44 are blown when the corresponding coils 22 generate excessive heat, thereby cutting off the current to all the coils 22.

The arranging portion 43 includes a side plate 43 a provided at a distance from the side plates 29 of the storage portions 27C and 27D, and an end plate 43 b provided in the direction of the insertion port 32. The side plate 43 a extends parallel to the side plate 29 and has a shorter overall length than the side plate 29. The end plate 43b is provided to prevent the temperature fuse 44 from falling off, and includes a slot 43c through which a lead wire (not shown) is inserted. The side plate 29 of the first accommodating portion 27A prevents the end of the temperature fuse 44 on the opposite side of the end plate 43b from falling off. Ribs 43d on the outer periphery of the crimp temperature fuse 44 are formed on the side plates 29 and 43a. A through hole 43 e for heat dissipation is provided at the bottom of the arrangement portion 43.

In this way, since the temperature fuse 44 is arranged in the ferrite holder 25, excessive heat generation of the coil 22 can be reliably detected, and the melting loss of the protective frame 20 made of resin can be effectively prevented. In addition, since it is not necessary to newly install other components for mounting the temperature fuse 44, the number of components can be reduced.

In addition, the rice cooker (cooker) 10 of this invention is not limited to the structure of the said embodiment, It can change variously.

The ferrite holder 25 and the reflection plate 45 may be provided with a fixing portion that suppresses the vibration of the reflection plate 45. For example, as shown in FIG. 10, the support plate 39 of the ferrite holder 25 may be provided with a fixing protrusion 39b having a spherical detachment prevention portion, and a fixing plate having an elastic deformation may be provided on the bottom plate portion 46 of the reflection plate 45 The bottom plate portion 46 is fixed to the support plate 39 through the fixing holes 46b. This makes it possible to more effectively prevent vibration of the bottom plate portion 46 of the reflection plate 45.

The ferrite core 24 is not limited to a prismatic shape, and may be a cylindrical shape or a shape that is curved as a whole.

Two or more coils 22 may be arranged. In addition, only one axis A and the center of the protective frame 20 may be arranged. In either case, the ferrite holder 25 need only be provided with a plurality of accommodating portions 27 such that the center of the coil 22 protrudes radially as a center. In addition, the plurality of accommodating portions 27 are not limited to an integrated structure, and may be provided separately.

The support plate 39 of the ferrite holder 25 may be provided between the second storage portion 27B and the third storage portion 27C and between the second storage portion 27B and the fourth storage portion 27D.

Although the rice cooker 10 has been described as an example in the above embodiment, as long as it has a bottom-shaped cylindrical pot storage portion, a coil disposed outside the pot storage portion, and a ferrite disposed outside the coil, Rack, and a columnar ferrite core is housed in a ferrite holder, the present invention can be applied to any cooker and can achieve the same action and effect.

In summary, the technical means disclosed in the present invention can effectively solve problems such as knowledge, and achieve the intended purpose and effect. It has not been published in publications before application, has not been publicly used, and has long-term progress. The invention referred to in the Patent Law is correct, and he filed an application in accordance with the law. He earnestly hopes that Jun will give him a detailed review and grant a patent for the invention.

However, the above are only a few preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited in this way, that is, equivalent changes and modifications made according to the scope of the patent application and the content of the invention specification of the present invention are It should still fall within the scope of the invention patent.

〔this invention〕

10‧‧‧ Rice Cooker (Cooker)

12‧‧‧ rice cooker

12a‧‧‧ bottom

12b‧‧‧ Peripheral

12c‧‧‧ Bend

14‧‧‧ rice cooker body

15‧‧‧ main body

16‧‧‧ Shoulder

17‧‧‧ hinge connection

18‧‧‧ Pot Containment Department

19‧‧‧Inner shell

20‧‧‧ protection frame

20a‧‧‧Cage Department

20b‧‧‧ bottom wall

20c‧‧‧curved wall

20d‧‧‧ sidewall

20e‧‧‧stop

20f‧‧‧ support

20g‧‧‧ convex

20h‧‧‧ convex

20i‧‧‧ Positioning protrusion

22‧‧‧ Coil

22a‧‧‧Leader

22b‧‧‧outer surface

24‧‧‧ Ferrite Core

24a‧‧‧side

24b‧‧‧outer surface

24c‧‧‧Inner surface

25‧‧‧Ferrite cage

26‧‧‧ base

27, 27A ～ 27D‧‧‧Ferrite Containment Department

28‧‧‧ Top

29‧‧‧Side

29a‧‧‧Inner edge

29b‧‧‧ outer edge

30‧‧‧outer connecting part (connecting part)

30a‧‧‧ abutment film

30b‧‧‧ abutment

30c‧‧‧ protrusion

31a, 31b ‧‧‧ inside joint

32‧‧‧Inlet

33a, 33b‧‧‧‧End plate

34a‧‧‧First elastic sheet

34b‧‧‧Second elastic sheet

35a‧‧‧First Restricted Section

35b‧‧‧Second Restricted Section

36a, 36b ‧‧‧ chamfer

37‧‧‧Elastic sheet

37a‧‧‧inclined

38‧‧‧stop

39‧‧‧ support plate

39a‧‧‧outer

39b‧‧‧Fixed protrusion

40‧‧‧first thread fixing part

41‧‧‧Second thread fixing part

42‧‧‧ the third thread fixing part

43‧‧‧Configuration Department

43a‧‧‧Side

43b‧‧‧End plate

43c‧‧‧slot

43d‧‧‧ rib

43e‧‧‧through hole

44‧‧‧ Temperature Fuse

45‧‧‧Reflector

46‧‧‧ floor

46a‧‧‧periphery

46b‧‧‧Fixing hole

47‧‧‧Side panel section

47a‧‧‧periphery

47b‧‧‧ gap

48‧‧‧step

48a‧‧‧Part I

48b‧‧‧Part II

49a ～ 49d‧‧‧through hole

50‧‧‧ protrusion

50a‧‧‧Threaded hole

50b‧‧‧Threaded hole

50c‧‧‧Stopper

52‧‧‧Control Board

54‧‧‧Drum fan

55‧‧‧ Lid

56‧‧‧ cover main body

57‧‧‧ cover outer body

58‧‧‧Inner cover

59‧‧‧Operation Panel

60‧‧‧Operation buttons

61‧‧‧LCD panel

S1‧‧‧ Clearance between elastic sheet and abutment sheet

S2‧‧‧Restriction between clearance and coil

T‧‧‧Thickness of Ferrite Core

FIG. 1 is a cross-sectional view of a rice cooker according to an embodiment of the present invention. Fig. 2 is a perspective view of the rice cooker with the lid opened. FIG. 3 is a perspective view of a lower portion of the rice cooker after disassembly. FIG. 4 is a bottom view of the rice cooker with the main body casing, a part of the reflecting plate, and a part of the ferrite holder removed. Fig. 5 is a cross-sectional view of a protective frame, a coil, a ferrite holder, and a reflecting plate. Fig. 6 is an exploded perspective view of a protective frame, a coil, a ferrite holder, and a reflecting plate. Fig. 7 is an exploded perspective view of a ferrite holder and a reflecting plate. Fig. 8 is an exploded perspective view of the ferrite holder and the reflecting plate as viewed from a different angle from Fig. 7. FIG. 9 is a cross-sectional view showing a relationship between a ferrite holder and a ferrite core. Fig. 10 is a perspective view showing a modified example of the ferrite holder and the reflecting plate.

Claims (10)

A cooking device, comprising: a bottomed cylindrical pot accommodating portion; and a ferrite holder, which is arranged outside the pot accommodating portion and maintains an annular shape with the pot accommodating portion. A coil, and the ferrite holder has a ferrite storage portion that holds and holds a columnar ferrite core, the ferrite storage portion includes: an insertion port for the ferrite core Inserting; and an elastic piece provided on the side of the pot accommodating portion, and elastically urging the ferrite core, the elastic piece having a restricting portion, the restricting portion passing through the pot accommodating portion or The contact of the coil restricts the elastic deformation of the elastic piece. The cooking device according to item 1 of the scope of patent application, wherein the insertion port is provided on one end side in the longitudinal direction of the ferrite containing portion, and the elastic sheet includes a first elastic sheet formed from the first elastic sheet. The one end side of the insertion port extends toward the other end side opposite to the insertion port; and a second elastic sheet facing the first elastic sheet from the other end side toward the One end side extends, and the restricting portion is provided at an opposing portion of the first elastic sheet and the second elastic sheet opposite to each other, and protrudes toward the coil. The cooking device according to item 2 of the scope of patent application, wherein the restricting portion provided on the second elastic sheet is inclined in a direction approaching the insertion port. The cooker according to any one of claims 1 to 3, wherein the insertion port is provided with a stopper that prevents the ferrite core inserted from coming out. The cooking device according to any one of claims 1 to 3, wherein the thickness from the outer surface to the inner surface of the ferrite core has a predetermined allowable error, and within the allowable error, In a state in which the ferrite core of the smallest size is inserted into the ferrite receiving portion through the insertion port, and the elastic sheet is deformed most by the ferrite core, the pot receiving portion or The gap between the outer surface of the coil and the restricting portion is zero. The cooker according to item 4 of the scope of patent application, wherein the thickness from the outer surface to the inner surface of the ferrite core has a predetermined tolerance, and the iron having the smallest size within the tolerance is within the tolerance. An ferrite core is inserted into the ferrite receiving portion through the insertion port, and in a state where the elastic sheet is deformed the most by the ferrite core, the outer surface of the pot receiving portion or the coil and The gap between the restricting portions is zero. The cooking device according to any one of claims 1 to 3, wherein the cooking device is provided with a reflecting plate, which is arranged outside the ferrite holder and is located from the ferrite holder. When viewed in a direction in which the axis of the pot accommodating portion extends, the shape of the coil is covered, and a plurality of the ferrite accommodating portions are provided so as to protrude radially with the center of the coil as a center. A support plate having a contour corresponding to the outer shape of the reflecting plate is provided in at least one space between the ferrite containing portions. The cooker according to item 4 of the scope of patent application, wherein the cooker includes a reflecting plate that is disposed outside the ferrite holder and extends from an axis of the pot accommodating portion. When viewed in a direction covering a shape of the coil, a plurality of the ferrite containing portions are provided so as to protrude radially with a center of the coil as a center, and a plurality of the ferrite containing portions are arranged adjacent to each other. At least one of the spaces is provided with a support plate having an outline corresponding to the outer shape of the reflection plate. The cooker according to item 5 of the scope of patent application, wherein the cooker includes a reflecting plate that is arranged outside the ferrite holder and extends from an axis of the pot accommodating portion. When viewed in a direction covering a shape of the coil, a plurality of the ferrite containing portions are provided so as to protrude radially with a center of the coil as a center, and a plurality of the ferrite containing portions are arranged adjacent to each other. At least one of the spaces is provided with a support plate having an outline corresponding to the outer shape of the reflection plate. The cooking appliance according to item 7 of the scope of patent application, wherein the ferrite holder includes: a first threaded fixing portion fixed to the pot accommodating portion; a second threaded fixing portion connected to the reflection The plate is fixed to the pot accommodating portion together; and a third screw fixing portion which fixes the reflecting plate.