JP7241259B2 - induction cooker - Google Patents

Description

The present invention relates to an induction heating cooker.

Patent Literature 1 discloses an induction heating cooker. Patent Literature 1 discloses a support portion that holds a coil and is connected to the housing in the housing. The material of the support is metal. If the support is made of metal, the support itself may be heated by induction, reducing energy efficiency. On the other hand, if the support portion is replaced with a resin, the support portion itself is not induction-heated, so the energy efficiency is improved.

WO2013/069169

However, when the supporting portion is made of resin, the energy efficiency is improved, but the leakage magnetic flux may affect the control board below the supporting portion. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to reduce the influence of leakage magnetic flux on a control board when a support portion is made of resin.

In order to solve the above-described problems, according to one aspect of the present invention, there is provided a top plate on which a cooking vessel is placed, a coil arranged below the top plate, and a second coil arranged below the coil. a first ferrite, a second ferrite, and a resin support portion arranged below the second ferrite and supporting the coil, the first ferrite, and the second ferrite; and a resin support portion arranged below the support portion and a control board, wherein the second ferrite is arranged on a second virtual plane closer to the control board than on the first virtual plane on which the first ferrite is arranged. be.

According to the present invention, when the support portion that supports the coil is made of resin, the second ferrite can reduce the influence of leakage magnetic flux on the control board.

1 is a perspective view of an induction heating cooker according to one embodiment of the present invention; 1 is an exploded perspective view of an induction heating cooker according to an embodiment of the present invention; FIG. 1 is a perspective view showing a coil unit and a support portion of an induction heater according to one embodiment of the present invention; 1 is an exploded perspective view showing a coil unit and a support portion of an induction heater according to an embodiment of the present invention; FIG. 1 is an exploded perspective view of main parts of an induction heating cooker according to an embodiment of the present invention; FIG. 4 is a top view showing a state in which the second ferrite is arranged in the supporting portion in one embodiment of the present invention; FIG. 2 is a top view schematically showing the positional relationship between the first ferrite and the second ferrite in one embodiment of the present invention; FIG. 2 is an exploded perspective view of the coil base as seen obliquely from above in one embodiment of the present invention; FIG. 2 is an exploded perspective view of the coil base as viewed obliquely from below in one embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, induction heating cooker 100 according to the present embodiment includes top unit 10 and main unit 30 .

The top unit 10 has a top plate 11 and an underframe (not shown). The top plate 11 is used for placing a cooking container such as a pot. The top plate 11 is arranged on the main unit 30 . The top plate 11 has a flat plate shape. The material of the top plate 11 is glass with high insulating and heat resistance, such as crystallized glass. In this embodiment, the top plate 11 also functions as an interface and a display surface for an operation unit, which will be described later.

The underframe is used to attach the top plate 11 to the housing of the main unit 30 . The underframe is adhered to the lower surface (that is, the back surface) of the top plate 11 via an adhesive. The underframe consists of four frame pieces. Each frame piece has a horizontal surface on the lower surface of the top plate 11 and a vertical surface bent downward from the horizontal surface. The horizontal surface is adhered to the lower surface of the top plate 11, and the vertical surface is joined to the housing. Each frame piece is arranged inside the four sides of the top plate 11 . The material of the underframe is, for example, steel or stainless steel.

As shown in FIGS. 2 to 4, the main unit 30 includes a housing 31, coil units (a first coil unit 32 and a second coil unit 33), a support portion 34, a fan unit 35, and a coil control board. 36 , an operating unit 37 and a second ferrite 38 .

The housing 31 accommodates the first and second coil units 32 and 33, the support portion 34, the second ferrite 38, the fan unit 35, the coil control board 36, the operation unit 37, and the like. The housing 31 is arranged below the top unit 10 . The housing 31 may be arranged so as to be embedded in an opening provided in the cooking table, or may be arranged on the cooking table. The housing 31 has a box shape. A plurality of holes for exhaust are formed in the inner surface of the housing 31 . Although not shown in FIG. 2, the power cord protrudes from the bottom surface of the housing 31 in FIG. 2 on the right side and the back side. The material of the housing 31 is, for example, the same as that of the underframe, such as steel or stainless steel.

A coil unit includes a first coil unit 32 and a second coil unit 33 . The first coil unit 32 is arranged on the left side of the paper surface of FIG. The second coil unit 33 is arranged on the right side of the paper surface of FIG. Since the basic configurations of the first and second coil units 32 and 33 are substantially the same except for the presence or absence of the second ferrite 38, only the first coil unit 32 will be described.

As shown in FIGS. 3A, 3B, and 4, the first coil unit 32 includes a base 51, a first ferrite 52, a coil 53, a light guide unit 54, and an optical sensor 55 shown in FIGS. ,including.

Base 51 accommodates first ferrite 52 , coil 53 , and light guide unit 54 . The base 51 is arranged on the support portion 34 . The base 51 is arranged to be biased toward the top plate 11 by a coil spring 39 arranged between the base 51 and the support portion 34 . The base 51 has a circular shape slightly larger than the coil 53 . A groove 51 a for accommodating the first ferrite 52 , the coil 53 and the light guiding unit 54 is formed on the base 51 . The material of the base 51 is a highly heat-resistant resin such as PBT resin (polybutylene terephthalate resin).

The first ferrite 52 is used to guide the magnetic flux generated from the coil 53 to the cooking vessel. The first ferrite 52 includes a plurality of first ferrite pieces 52a. In this embodiment, for example, eight first ferrite pieces 52a are included. Each first ferrite piece 52 a is arranged on the base 51 and below the coil 53 . The eight first ferrite pieces 52a are arranged radially. Each first ferrite piece 52a has an elongated plate-like shape, and both ends in the longitudinal direction are bent upward.

The coil 53 passes a high-frequency current to generate magnetic flux lines, generate eddy currents in the cooking vessel, and heat the cooking vessel by resistive heat. Coil 53 is arranged on first ferrite 52 via an insulating sheet. Adhesive is applied to the area where the coil 53 and the base 51 directly face each other, and the coil 53 is adhered to the base 51 . Coil 53 is a wound coil of copper wire.

A light guide unit 54 is used to indicate the location of the cooking zone and indicate the heat level. The light guide unit 54 has a light guide plate 54a and an LED substrate. The light guide plate 54a transmits light from the LED substrate 54b. The light guide plate 54 a is arranged inside the base 51 and outside the coil 53 . The light guide plate 54a has an annular shape. The LED board 54b functions as a light source. The LED board 54b is arranged so as to be inserted into a part of the light guide plate 54a. A magnetic shield ring may be arranged between the light guide plate 54 a and the coil 53 . The magnetic shield ring cuts off leakage magnetic flux from the coil 53 . The material of the magnetic shield ring is metal, for example aluminum.

An optical sensor 55 shown in FIGS. 7 and 8 measures the temperature of the bottom surface of the cooking vessel. The optical sensor 55 is arranged below the gap of the coil 53 . The optical sensor 55 is an IR sensor, for example, and is composed of a light receiving portion and a substrate. In this embodiment, the optical sensor 55 is accommodated in a sensor holder 55a as shown in FIGS. 7 and 8. FIG. The sensor holder 55a is provided with a first claw 55b and a second hole 55c. The first claw 55b is provided on the inner end face of the sensor holder 55a. The second hole 55c is provided on the outer end surface. The rear surface of the base 51 is formed with a first hole 51b into which a first claw 55b is fitted. A second claw 51c is formed on the rear surface of the base 51 to be fitted into the second hole 55c. The sensor holder 55a is detachably attached to the base 51 by combining the first claw 55b and the first hole 51b, and the second claw 51c and the second hole 55c. In the present embodiment, the combination of the first claw 55b and the first hole 51b, and the second claw 51c and the second hole 55c are exemplified, but these claws and holes may be provided on the base 51 or the sensor holder. 55a. Also, the number of combinations is two in this embodiment, but may be one or three or more.

Next, the configuration of the support portion 34 will be described with reference to FIGS. 3A, 3B, and 4. FIG. The support portion 34 supports the base 51 and maintains a predetermined distance from the top plate 11 . The support portion 34 is arranged below the base 51 . The support portion 34 is arranged so as to bridge the front side and the back side of the housing 31 . The base 51 has a flat plate shape, and is formed with protrusions 34a, grooves 34b, holes 34c, and the like. A coil spring 39 is inserted into the protrusion 34a. The coil spring 39 presses the coil 53 against the top plate 11 via the base 51 . Signal lines of the second ferrite 38 and the coil 53 are arranged in the groove 34b. The holes 34c are for ventilation. The material of the support portion 34 is PBT resin. In this embodiment, two fixing metal fittings 40 are connected to each of the front side and the back side of the support portion 34 . The fixing bracket 40 fixes the support portion 34 to the housing 31 . The fixture 40 is a bent plate-like body, and has a vertical surface, a horizontal surface bent inward from the lower end of the vertical surface, and a horizontal surface bent outward from the upper end of the vertical surface. The material of the fixture 40 is a steel plate. The fixture 40 has a higher strength than resin fixtures.

The second ferrite 38 horizontally disperses the magnetic flux leaking downward from the base 51 . That is, the second ferrite 38 prevents the magnetic flux leaking from the base 51 from reaching the component (the fan unit 35 in the present embodiment) arranged below the support portion 34 . The second ferrite 38 is housed below the base 51 and on the support portion 34 . The second ferrite 38 is locally arranged below the region where the first ferrite 52 is arranged (region 63 in FIG. 6). That is, as shown in FIG. 6, when the outer shape of the region 63 in which the first ferrite 52 is arranged is circular, the first ferrite 52 is locally arranged in a part of the vertical projection plane. The second ferrite 38 is arranged above the fan controller 35 d of the fan unit 35 (the first electronic component of the present disclosure, which is the fan controller). The second ferrite 38 is composed of three second ferrite pieces 38a. Each second ferrite piece 38a has an elongated flat plate shape. The three second ferrite pieces 38a are arranged in parallel so that their long sides face each other. In this embodiment, the second ferrite 38 is arranged only below the coil 53 on the left side, and is not arranged below the coil 53 on the right side. This is because the fan controller 35d is arranged only below the left coil 53 in this embodiment. Details will be described later.

The fan unit 35 has a fan 35a, a fan control board 35b, and a fan case 35c that houses the fan 35a and the fan control board 35b. Note that in the present embodiment, the power cord is pulled out from the bottom surface of the housing 31 on the far right side. Therefore, in the present embodiment, since the space on the right side is small, the fan unit 35 is arranged only below the coil 53 on the left side, and is not arranged below the coil 53 on the right side. In FIG. 4, the fan case 35c is omitted in order to explain the fan controller 35d and the fan 35a. A fan controller 35d is arranged on the fan control board 35b. A fan controller 35d controls the rotation of the fan 35a. The fan controller 35 d is arranged directly below the second ferrite 38 via the support portion 34 . The fan controller 35d includes a CPU (Central Processing Unit) and the like. The fan 35a takes in air from below and sends air from left to right through the heat sink 36b. A fan controller 35d is arranged on the fan 35a.

The coil control board 36 controls heating of the left coil 53 and the right coil 53 . The coil control board 36 is arranged apart from the fan control board 35b. It is arranged on the right side of the fan unit 35 and below the left support portion 34 and the right support portion 34 . A controller for the coil 53 (that is, a coil controller 36a), a heat sink 36b, and the like are arranged on the coil control board 36. As shown in FIG. The heat sink 36b is arranged to extend rightward from the vicinity of the fan 35a. An IGBT, which is part of the coil controller 36a, is arranged on the heat sink 36b. The distance between the components arranged on the coil control board 36 and the left coil 53 is longer than the distance between the fan controller 35 d and the left coil 53 . That is, in the present embodiment, the fan controller 35 d is the electronic component arranged closest to the left coil 53 . Further, in the present embodiment, the second ferrite 38 is arranged above the fan controller 35d, and the second ferrite 38 is not arranged above the coil controller 36a.

The operation unit 37 in FIG. 2 controls the display of the top plate 11 and receives user's operations. The operation unit 37 inputs the received signal to the coil controller 36a. The operation unit 37 is arranged on the support portion 34.

The operation of the induction heating cooker 100 of the present embodiment will be described below. Magnetic lines of force are generated around the coil 53 when a high-frequency current flows through the coil 53 . The lines of magnetic force are transmitted to the pot bottom through the first ferrite piece 52a. If the second ferrite 38 is not arranged here, the lines of magnetic force leaking downward through the gaps between the first ferrite pieces 52a may reach the fan controller 35d through the support portion 34. FIG. On the other hand, since the second ferrite 38 is arranged in the present embodiment, the leaked magnetic lines of force are dispersed horizontally along the second ferrite 38 . Therefore, it becomes difficult for the leaked magnetic lines of force to reach the fan controller 35d.

Incidentally, in the present embodiment, an intake port is provided on the bottom surface of the housing 31 and below the fan unit 35 . The air sucked from the intake port by the fan 35a dissipates heat from the heat sink 36b. Therefore, heat is dissipated from the IGBT attached to the heat sink 36b.

As described above, induction heating cooker 100 of the present embodiment includes top plate 11 on which a cooking container is placed, coil 53 arranged below top plate 11 , and coil 53 arranged below coil 53 . a first ferrite 52 and a second ferrite 38; and an arranged fan control board 35b (an example of the control board of the present disclosure). As shown in FIG. 4, the second ferrite 38 is arranged on the second virtual plane 62 closer to the fan control board 35b than the first virtual plane 61 on which the first ferrite 52 is arranged.

As a result, in the present embodiment, the lines of magnetic force leaking downward through the gaps between the first ferrite pieces 52 a are dispersed horizontally along the second ferrite 38 . Therefore, it becomes difficult for the leaked magnetic lines of force to reach the fan controller 35d.

Further, in this embodiment, a fan is further provided, and the control board is the control board 35b of the fan.

When attempting to downsize an induction heating cooker, a fan may be arranged below the coil. Even in this case, in the present embodiment, the second ferrite 38 can suppress the influence of leakage magnetic flux on the control board 35b of the fan.

Further, in this embodiment, a housing 31 is provided. The housing 31 is provided with an intake port below the fan.

If an intake port is provided below the fan, it is possible to take in air having a temperature lower than the temperature inside the housing 31 . In addition, a sufficient amount of air can be taken in compared to the case where the air intake is provided on the side surface or the back surface of the housing 31 . Therefore, when sucking air from below the fan, it is necessary to arrange the control board 35b of the fan above the blades of the fan. If the fan control board 35b is arranged above the fan, the fan control board 35b will be close to the coil and will be more susceptible to leakage magnetic flux. On the other hand, in the present embodiment, the second ferrite 38 can suppress the influence of leakage magnetic flux on the control board 35b of the fan.

Further, in the present embodiment, as shown in FIG. 6, the second ferrite 38 is locally arranged below the region 63 where the first ferrite 52 is arranged.

Accordingly, in the present embodiment, the second ferrite 38 can be arranged only in the required area, so the number of parts can be reduced. Moreover, the weight of the induction heating cooker 100 can be reduced.

In the present embodiment, first ferrite 52 includes a plurality of radially arranged first ferrite pieces 52a, and second ferrite 38 includes a plurality of linearly arranged second ferrite pieces 38a.

As a result, in the present embodiment, the gaps between the second ferrite pieces 38a can be reduced as much as possible.

Further, in the present embodiment, a fan controller 35d (an example of the first electronic component of the present disclosure) is arranged on the fan control board 35b. A coil controller 36a (second electronic component of the present disclosure) is arranged on a coil control board 36 (an example of another control board of the present disclosure) that is spaced apart from the fan control board 35b. The distance between the fan controller 35 d and the coil 53 is shorter than the distance between the coil controller 36 a and the coil 53 . A second ferrite 38 is arranged above the fan controller 35d. No second ferrite 38 is arranged above the coil controller 36a.

As a result, in the present embodiment, it is possible to reduce the influence of the lines of magnetic force on the electronic component closest to the coil 53 (the fan controller 35d in the present embodiment).

Moreover, in the present embodiment, the induction heating cooker 100 is provided with a fan. A second ferrite 38 is arranged above the fan controller 35d.

Thus, in the present embodiment, the influence of the lines of magnetic force on the fan controller 35d closest to the coil 53 can be reduced.

INDUSTRIAL APPLICABILITY The present invention is applicable to an induction heating cooker that supports a coil with a resin support.

REFERENCE SIGNS LIST 100 induction heating cooker 10 top unit 11 top plate 30 main unit 31 housing 32 first coil unit 33 second coil unit 34 support portion 34a projection 34b groove 34c hole 35 fan unit 35a fan 35b fan control board (control board)
35c fan case 35d fan controller 36 coil control board (other control board)
36a coil controller 36b heat sink 37 operation unit 38 second ferrite 38a second ferrite piece 39 coil spring 40 fixture 51 base 51a groove 51b first hole 51c second claw 52 first ferrite 52a first ferrite piece 53 coil 54 light guide unit 54a Light guide plate 54b LED substrate 55 Optical sensor 55a Sensor holder 55b First nail 55c Second hole 61 First virtual plane 62 Second virtual plane 63 Area

Claims (5)

a top plate on which the cooking container is placed;
a coil positioned below the top plate;
a first ferrite and a second ferrite arranged below the coil;
a resin support portion disposed below the second ferrite and supporting the coil, the first ferrite, and the second ferrite;
a fan arranged below the support;
a fan control board arranged below the support and above the fan;
another control board spaced apart from the fan control board and placed at a position lower than the fan control board ;
the fan has an air intake at the bottom and is configured to send air to the other control board;
A fan controller that controls the fan is arranged on the fan control board, and a coil controller that controls the coil is not arranged,
The coil controller is arranged on the other control board,
the distance between the fan controller and the coil is shorter than the distance between the coil controller and the coil;
The second ferrite is arranged so that at least part of it is located above the fan control board on a second virtual plane closer to the fan control board than on the first virtual plane on which the first ferrite is arranged. An induction cooker. a housing provided below the top plate and housing the coil, the first ferrite, the second ferrite, the support portion, the fan, the fan control board, and the other control board; 2. The induction heating cooker according to claim 1, wherein the housing is provided with an intake port below the fan. 3. The induction heating cooker according to claim 1, wherein said second ferrite is locally arranged below the region where said first ferrite is arranged. The first ferrite includes a plurality of radially arranged first ferrite pieces,
The second ferrite includes a plurality of second ferrite pieces arranged in a straight line,
The induction heating cooker according to any one of claims 1 to 3. The second ferrite is arranged above the fan controller,
The induction heating cooker according to any one of claims 1 to 4, wherein said second ferrite is not arranged above said coil controller.

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