JP2008059984A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating cooker equipped with an exclusive intake and exhaust channel for cooling heating coils located farthest from an exclusive intake fan. <P>SOLUTION: The induction heating cooker is structured of a main body 2, a top plate covering a top face of the main body 2, a plurality of heating coils 18, 20, 22 provided at a lower part of the top plate, a roaster having an opening in front of the main body 2, a roaster cover 32 covering the roaster, and an intake fan 40 for taking in outside air from an inlet formed at the top plate. An opening is provided at a substrate cover 44 covering a control substrate for controlling the plurality of heating coils 18, 20, 22, and cooling air is to be sent to a heating coil 18 located farthest from the intake fan 40 through a ventilating duct 76 with its one end communicated with the opening. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an induction heating cooker used by being incorporated in a system kitchen or the like.

  2. Description of the Related Art Conventionally, this type of heating cooker includes an intake-exhaust fan and an exhaust-exclusive fan that are forcibly formed in a main body integrated with a top plate and a casing. In such a heating cooker, even if the pressure loss inside the device is large, the air taken in from the intake port is reliably exhausted from the exhaust port, so that the device is efficiently cooled (for example, see Patent Document 1). .)

  In addition, a plurality of (for example, two) heating coils constituting induction heating means are provided at the front part in the main body, and a radial heater that is an electric resistance heating type heating means is provided behind the heating coil. There is also a thing, the air taken in from the fan dedicated to intake air cools the control board equipped with electronic parts, and further cools the operation part provided on the front of the heating cooker or the heating part such as the heating cabinet and heating coil, It is discharged outside by an exhaust fan (see, for example, Patent Document 2).

JP-A-11-354264 JP 2004-288650 A

  Recently, a heater provided with a third heating coil instead of the radial heater provided behind the heating coil has been proposed, and a design for securing an intake / exhaust path for the third heating coil has also been made.

  In addition, when heating an aluminum object to be heated with a heating coil, it is necessary to supply a high-frequency large current to the heating coil, but the heating means on the rear side is either a radial heater or a third heating coil. In addition, a sufficient amount of cooling air for cooling the heating coil located farthest from the intake fan is required, and it is necessary to further secure an intake / exhaust path for cooling the heating coil.

  The present invention has been made in view of such problems of the prior art, and is an induction heating cooker provided with a dedicated intake / exhaust path for cooling a heating coil located farthest from the dedicated intake fan. The purpose is to provide.

  To achieve the above object, the invention according to claim 1 of the present invention includes a main body, a top plate covering the upper surface of the main body, and a plurality of heating coils provided below the top plate; An induction heating cooker comprising: a roaster having an opening on the front surface of the main body; a roaster cover that covers the roaster; and an intake fan for taking outside air from an intake port formed in the top plate. A first heating coil located farthest from the intake fan through a ventilation duct having one end communicating with the opening, the substrate cover covering a control board for controlling the plurality of heating coils It is characterized by sending cooling air to.

  In the invention according to claim 2, an opening communicating with the other end of the ventilation duct is formed in the roaster cover, and air passing through the ventilation duct is discharged through the opening. It is characterized by.

  Furthermore, in the invention described in claim 3, a first opening is formed in the ventilation duct located immediately below the center of the first heating coil, and the air that has passed through the first opening is used to form the first opening. The first heating coil is cooled.

  According to a fourth aspect of the present invention, a second opening is formed in the ventilation duct located below the peripheral edge of the first heating coil, and the air that has passed through the second opening is used to form the second opening. The first heating coil is cooled.

  The invention according to claim 5 forms a third opening in the ventilation duct, introduces air around the ventilation duct into the ventilation duct through the third opening, and It is characterized by discharging through the opening of the roaster cover.

  According to a sixth aspect of the present invention, there is provided an auxiliary fan case in which an auxiliary fan is accommodated between the substrate cover and the ventilation duct, and the air is sucked into the auxiliary fan through the opening of the substrate cover. The air is forcibly sent to the ventilation duct.

  According to a seventh aspect of the present invention, a ventilation path is formed in the auxiliary fan case, and cooling air is sent to the first heating coil through the opening of the substrate cover and the ventilation path. It is characterized by.

  The invention according to claim 8 is characterized in that the ventilation duct is attached to the roaster cover.

  According to the present invention, the cooling air is sent to the first heating coil located farthest from the intake fan via the ventilation duct whose one end communicates with the opening provided in the substrate cover. Even if a high frequency and a large current are supplied to the coil, the first heating coil can be sufficiently cooled.

  If an auxiliary fan is interposed between the substrate cover and the ventilation duct and the air sucked into the auxiliary fan is forcibly sent to the ventilation duct through the opening of the substrate cover, the first heating coil The cooling air volume can be ensured more reliably.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 to FIG. 3 show an induction heating cooker according to the present invention, and the cooker main body 2 is dropped from above and incorporated in an opening provided on the top surface of the kitchen cabinet. The upper surface of the main body 2 is covered with a plate frame 6 surrounding the top plate 4 made of crystallized ceramic. A plurality of (three in the present embodiment) heating units 8, 10, and 12 are displayed on the top plate 4 by printing. In the rear part of the main body 2 behind the top plate 4, an intake port 14 for taking outside air into the main body 2 and an exhaust port 16 for discharging the heated air inside the main body 2 to the outside are formed. ing.

  Inside the main body 2 corresponding to the heating units 8, 10, 12, first and second heating coils 18, 20 constituting induction heating means are disposed in front, and behind these two heating coils 18, 20. A third heating coil 22 is provided. These three heating coils 18, 20, and 22 are mounted on coil bases 24, 26, and 28, respectively.

  Below the first heating coil (the heating coil on the left side of FIG. 1) 18, a roaster 30 having an opening on the front surface of the main body is formed as shown by a broken line as a heating chamber for heating fish and the like. A roaster cover 32 as a partition plate that shields heat from the roaster 30 is interposed between the first heating coil 18 and the roaster 30. A gap for heat insulation is provided on the upper surfaces of the roaster cover 32 and the roaster 30.

  A plurality of (for example, three) support members (not shown) for supporting the coil base 24 on which the first heating coil 18 is placed are integrally formed on the roaster cover 32. The first heating coil 18 is pressed against the back surface (lower surface) of the top plate 4 by a spring 33 attached to the support member.

  Moreover, the operation part 35 operated when cooking using an induction heating cooking appliance is provided in the front surface of the main body at the side of the roaster 30. Further, on the side of the roaster 30, below the second heating coil 20, three control boards 34, 36, equipped with electronic components for controlling the first to third heating coils 18, 20, 22, A plurality of (for example, two) centrifugal intake fans 40 and 42 for sucking air outside the main body 2 are arranged above and below. .

  The three control boards 34, 36, 38 are cooled by the discharge air from the intake fans 40, 42. In the present embodiment, however, as indicated by the broken line arrows in FIG. In addition, more cooling air is supplied to the upper and lower control boards 34 and 36 than to the intermediate control board 38. Moreover, since the output of the 3rd heating coil 22 arrange | positioned back among the three heating coils 18, 20, and 22 is the smallest, the control board 38 which controls the 3rd heating coil 22 is arrange | positioned in an intermediate | middle layer. is doing.

  However, since the amount of cooling air in the intermediate layer is small, the intermediate layer is configured in a two-step shape with a step, and the first circuit component such as a switching element or a diode bridge (power module) is placed on the upper step 38a. A second circuit component such as a capacitor is placed on the lower stage 38b to improve the cooling efficiency. On the first circuit component placed on the upper stage 38a, a heat sink 43 for improving the heat transfer rate is fixed as a heat radiating means. A plurality of cooling fins extending are formed.

  In addition, a board integrally formed to cover the control boards 34, 36, 38 and the intake fans 40, 42 and a fan cover (hereinafter referred to as a fan cover) 44 are substantially the same height as the roaster cover 32, An air intake fan case 46 that forms the outer shell of the intake fans 40, 42, the roaster 30, the side wall portion (right side wall portion in FIG. 1) 2a, and the space surrounded by the front wall portion 2b of the main body outer shell It is arranged so as to partition the upper part.

  4 to 6 show a fan cover 44 and an intake fan case 46. On the substrate side of the fan cover 44, a plurality (for example, for supporting a coil base 26 on which the second heating coil 20 is placed (for example, Three support members 48 are integrally formed, and the second heating coil 20 is pressed against the back surface (lower surface) of the top plate 4 by a spring 50 attached to the support member 48.

  The fan cover 44 positioned above the intake fan 40 is integrally formed with an intake portion 44a protruding upward, and external air taken in from the intake port 14 is supplied to the intake portion 44a. To the intake fans 40 and 42. Further, on the third heating coil 22 side of the fan cover 44, one of a plurality of (for example, three) support members 52 for supporting the coil base 28 on which the third heating coil 22 is placed is a fan. The cover 44 is formed integrally with a side wall (vertical wall) of the intake portion 44a.

  Further, two support members (not shown) for supporting the coil base 28 are integrally formed on the roaster cover 32 below the third heating coil 22, and these two support members and the above-described support members are described above. The third heating coil 22 is pressed against the back surface (lower surface) of the top plate 4 by a spring 56 attached to one support member 52.

  Further, a lower case 60 that is a part of the auxiliary fan case 58 is integrally formed on the side of the third heating coil 22 of the intake fan case 46, and the auxiliary fan (first auxiliary fan) is formed in the lower case 60. Fan) 62 is accommodated, and an upper case 64 which is another part of the auxiliary fan case 58 is screwed to the lower case 60. Further, the lower case 60 is formed with an intake port 60a through which air discharged from the intake fan 40 is sucked, and the upper case 64 is formed with a discharge port 64a through which air discharged from the auxiliary fan 62 is discharged. Is formed.

  As shown in FIG. 4, an annular magnetic shield ring 66 is placed on the coil base 28 outside the third heating coil 22. The coil base 28 outside the magnetic shield ring 66 has a fan cover 44. A substantially triangular extending portion 28a extending upward is integrally formed. The extending portion 28a is supported by the above-described support member 52 formed on the fan cover 44, and a ventilation path 68 for sending cooling air to the third heating coil 22 is provided in the vertical direction of the extending portion 28a. Is formed. Note that the above-described magnetic shield ring is similarly placed on the coil base 24 outside the first heating coil 18 and the coil base 26 outside the second heating coil 20.

  Further, the coil base 28 located substantially opposite to the extending portion 28a is integrally formed with a locking portion 28b having a substantially inverted L-shaped vertical section for holding the magnetic shield ring 66, The other two portions of the magnetic-shielding ring 66 partially locked to the locking portion 28 b are screwed to the coil base 28. This attachment method of the magnetic shield ring 66 is to prevent the coil base 28 or the magnetic shield ring 66 from being deformed by thermal expansion and to securely fix the magnetic shield ring 66. A portion may be provided, and at least one portion of the magnetic shield ring 66 may be screwed to the coil base 28.

  Further, two coil holders 70 extending in substantially parallel are screwed to the coil base 28, and the third heating coil 22 is sandwiched between the coil base 28 and the two coil holders 70 and held by the coil base 28. ing.

  Further, as shown in FIGS. 7 to 9, a circular opening 44b is formed in a fan cover (substrate cover) 44 that is located immediately below the second heating coil 20 and covers the control substrates 34, 36, and 38. A rectangular opening 44c is formed in the fan cover 44 closer to the roaster 30 than the circular opening 44b. The rectangular opening 44 c communicates with an intake port 74 a formed at one end of an auxiliary fan case 74 containing an auxiliary fan (second auxiliary fan) 72, and is formed at the other end of the auxiliary fan case 74. The discharge port 74 b communicates with one end of the ventilation duct 76. The auxiliary fan case 74 is formed with a ventilation path 74c separated from the auxiliary fan 72. One end of the ventilation path 74c communicates with the rectangular opening 44c of the fan cover 44, and the ventilation path 74c. The other end opens toward the first heating coil 18. The auxiliary fan case 74 and the ventilation duct 76 are screwed to the roaster cover 32.

  The ventilation duct 76 extends in the lateral direction from one end communicating with the auxiliary fan case 74 toward the lower side of the first heating coil 18 and further extends in the front-rear direction. An opening 76a is formed immediately below. A cutout 76b is formed in a part of the side wall formed around the opening 76a, and the other end (rear end) of the ventilation duct 76 is a rectangular opening 32a formed in the roaster cover 32 (see FIG. 3). Further, the ventilation duct 76 is formed with a plurality of openings 76c, 76d, and 76e.

In the induction heating cooker having the above configuration, the flow of air when cooking is performed using the first heating coil 18 located farthest from the intake fans 40 and 42 will be described below.
When a heated object such as a pan is placed on the heating unit 8 and cooking is performed using the first heating coil 18, if a large current is supplied to the first heating coil 18 by operating the operation unit 35, An eddy current is generated at the bottom of the heated object, and the heated object itself generates heat. At this time, power is also supplied to the intake fans 40 and 42 and the auxiliary fan 72, and the air taken from the intake port 14 descends the intake fan case 46 as shown by the broken line arrows in FIG. 42 is inhaled. The air discharged from the intake fans 40 and 42 passes over the control boards 34, 36 and 38 laminated in three layers, and a part of the opening 44 b is formed in the fan cover 44 above the control board 34. To cool the second heating coil 20, and another part passes through the opening 44c formed in the fan cover 44 on the side of the opening 44b and is sucked into the auxiliary fan 72, or Then, the air is introduced into the ventilation passage 74c on the side of the auxiliary fan 72.

  Further, the air that has passed through the control boards 34, 36, and 38 and the air that has passed through the opening 44 b of the fan cover 44 further pass through the operation unit 35 and then pass through the upper front part of the roaster 30 to cool each part. After that, the gas is discharged from the exhaust port 16.

  On the other hand, the air sucked into the auxiliary fan 72 is introduced from the auxiliary fan case 74 into the ventilation duct 76, and part of the air passes through the opening 76a to cool the first heating coil 18, and the other part. The roaster cover 32 is cooled by being sent rearward through the notch 76b. Further, the air introduced into the ventilation path 74 c flows toward the peripheral edge of the first heating coil 18 to cool the first heating coil 18. Further, of the air sucked into the auxiliary fan 72, the air that has not passed through the opening 76 a passes through the opening 76 e formed in the vicinity of the front end of the ventilation duct 76 to the peripheral portion of the first heating coil 18. Then, the first heating coil 18 is cooled.

  The air that has cooled the operation unit 35 provided on the front surface of the main body is introduced into the ventilation duct 76 through the opening 76c, while the air that has cooled the roaster cover 32 is introduced into the ventilation duct 76 through the opening 76d. The roaster cover 32 is further cooled by flowing backward in the ventilation duct 76, passes through an opening 32 a formed in the roaster cover 32, and is discharged from the exhaust port 16.

Next, the flow of air when cooking using the third heating coil 22 will be described below.
When an object to be heated such as a pan is placed on the heating unit 12 and cooking is performed using the third heating coil 22, a large current is supplied to the third heating coil 22 by operating the operation unit 35. An eddy current is generated at the bottom of the heated object, and the heated object itself generates heat. At this time, power is also supplied to the intake fans 40 and 42 and the auxiliary fan 62. As described above, the air sucked into and discharged from the intake fans 40 and 42 is discharged from the exhaust port 16 after cooling the control boards 34, 36, 38 and the like, but is discharged from the intake fan 40. Another part of the air is sucked into the auxiliary fan 62 accommodated in the auxiliary fan case 58 through the air inlet 60a formed in the lower case 60 of the auxiliary fan case 58, and the air discharged from the auxiliary fan 62 is discharged. It is discharged above the discharge port 64a formed in the upper case 64 of the auxiliary fan case 58.

  Further, the air discharged upward from the auxiliary fan 62 passes through the ventilation path 68 formed in the extending portion 28a of the coil base 28 on which the third heating coil 22 is placed, and the magnetic shield ring 66, the first After the 3 heating coils 22 and the like are cooled, they are discharged from the exhaust port 16.

  In the above-described embodiment, the air for cooling the first heating coil 18 is forcibly sent to the air duct 76 by the auxiliary fan 72, but the auxiliary fan 72 is not necessarily required. That is, by connecting one end of the ventilation duct 76 to the opening 44 c of the fan cover 44, the air sucked into the intake fans 40 and 42 is forcibly sent to the ventilation duct 76 via the fan cover 44. The first heating coil 18 can be cooled by the air blown to the first heating coil 18 through the opening 76 a of the duct 76.

  In the above-described embodiment, the substrate cover and the fan cover are integrally formed. However, the substrate cover and the fan cover are not necessarily formed integrally, and may be separated.

  As described above, since the heating cooker according to the present invention can efficiently cool the heating coil located farthest from the intake fan, the heating coil is fed with a high frequency and a large current to be heated. It is useful as an induction heating cooker capable of heating.

The exploded perspective view of the induction heating cooking appliance concerning this invention 1 is a longitudinal sectional view of the induction heating cooker of FIG. Top view of the induction heating cooker of FIG. 1 with the top plate and heating coil removed The disassembled perspective view of the 3rd heating coil, fan cover, and intake fan case which were provided in the induction heating cooking appliance of FIG. The perspective view when the auxiliary fan case shown in FIG. 4 is viewed from below Front view of the third heating coil, fan cover, and intake fan case of FIG. Exploded perspective view of fan cover, second auxiliary fan case and ventilation duct Exploded perspective view of the second auxiliary fan and its auxiliary fan case Bottom view of auxiliary fan and auxiliary fan case in FIG.

Explanation of symbols

2 cooker body, 2a side wall, 2b front wall, 4 top plate,
6 plate frame, 8, 10, 12 heating section, 14 air inlet, 16 air outlet,
18, 20, 22 heating coil, 24, 26, 28 coil base,
28a extension part, 28b locking part, 30 roaster, 32 roaster cover, 32a opening part, 33 spring, 34, 36, 38 control board, 35 operation part,
38a Upper control board, 38b Lower control board, 40, 42 Intake fan,
43 heat sink, 44 fan cover, 44a air intake,
44b, 44c opening, 46 intake fan case, 48 support member,
50 spring, 52 support member, 56 spring, 58 auxiliary fan case,
60 lower case, 60a air inlet, 62 first auxiliary fan,
64 Upper case, 64a Discharge port, 66 Magnetic shield ring, 68 Ventilation path,
70 coil holder, 72 second auxiliary fan, 74 auxiliary fan case,
74a Intake port, 74b Discharge port, 74c Ventilation path, 76 Ventilation duct,
76a opening, 76b notch, 76c, 76d, 76e opening.

Claims (8)

A main body, a top plate covering the upper surface of the main body, a plurality of heating coils provided below the top plate, a roaster having an opening on the front surface of the main body, a roaster cover covering the roaster, and an external An induction heating cooker including an intake fan for taking air from an intake port formed in the top plate,
An opening is provided in a substrate cover that covers a control substrate for controlling the plurality of heating coils, and a first heating coil located farthest from the intake fan is provided through a ventilation duct having one end communicating with the opening. An induction heating cooker characterized by sending cooling air. The induction according to claim 1, wherein an opening communicating with the other end of the ventilation duct is formed in the roaster cover, and air that has passed through the ventilation duct is discharged through the opening. Cooking cooker. A first opening is formed in the ventilation duct located immediately below the center of the first heating coil, and the first heating coil is cooled by air that has passed through the first opening. The induction heating cooker according to claim 2. A second opening is formed in the ventilation duct located below the peripheral edge of the first heating coil, and the first heating coil is cooled by air that has passed through the second opening. The induction heating cooker according to claim 3. A third opening is formed in the ventilation duct, and air around the ventilation duct is introduced into the ventilation duct through the third opening and discharged through the opening of the roaster cover. The induction heating cooker according to claim 4, wherein the induction heating cooker is used. An auxiliary fan case in which an auxiliary fan is accommodated is interposed between the board cover and the ventilation duct, and the air sucked into the auxiliary fan is forcibly sent to the ventilation duct through the opening of the board cover. The induction heating cooker according to any one of claims 1 to 5, wherein the induction heating cooker is configured as described above. 7. A ventilation path is formed in the auxiliary fan case, and cooling air is sent to the first heating coil through the opening of the substrate cover and the ventilation path. The induction heating cooker of Claim 1. The induction heating cooker according to any one of claims 1 to 7, wherein the ventilation duct is attached to the roaster cover.

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