JP3945485B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker, and more particularly to a configuration for cooling an induction heating coil and its drive circuit board.

  2. Description of the Related Art In recent years, induction heating cookers have become widespread as heating cookers used in kitchens as a safe clean heat source that does not use fire and does not generate combustion gas. The conventional configuration of this induction heating cooker was as follows.

  FIG. 4 is a perspective view of the induction heating cooker attached to the cabinet. Generally, this type of induction heating cooker is used by being incorporated in a cabinet 100 of a system kitchen. A top plate 2 is provided on the upper surface of the outer case 1, and the top plate 2 is provided with two induction heating portions 3 a and 3 b, a single radiant heater 4, and an intake port 5. A roaster 6 for grilling fish and the like, and an operation unit 7 for operating the roaster and the heating unit are provided on the front side surface.

  FIG. 5 is a right side sectional view of the induction heating cooker. In the figure, an induction heating coil 8 is provided below the top plate 2 corresponding to the induction heating unit 3a. A driving circuit 9 for driving the induction heating coil 8 is provided on the driving circuit board 10 below the driving circuit board 10. In the vicinity of the drive circuit board 10, a fan chamber is provided which is surrounded by a fan case 11 and a fan cover 12 and has a fan 13 and a motor 14 for driving the fan 13. The fan 13 is generally an axial fan. A partition plate 16 that controls the flow of wind and supports the drive circuit board 10 via a board base 15 is provided below the drive circuit board 10.

  With this configuration, when the motor 14 is driven and the fan 13 rotates, air is sucked from the air inlet 5. This air flows downward along the outer case 1 as shown by the arrow, passes through the fan 13, and is exhausted from the exhaust port of the fan chamber toward the drive circuit board 10 and the induction heating coil 8. This airflow cools the components of the drive circuit 9 on the drive circuit board 10 and then cools the induction heating coil to be discharged out of the outer case 1.

  Moreover, although the same structure as the induction heating part 3a is provided also with respect to the induction heating part 3b, the description is abbreviate | omitted.

  However, in recent years, in order to improve the usability of the roaster, there has been an increasing demand for increasing its internal volume. In order to respond to this demand, simply increasing the internal volume causes a problem that the size of the induction heating cooker increases.

  Therefore, it has been considered to design a drive circuit board having a drive circuit for driving the left and right induction heating coils by stacking them on either side. However, in this case, if an axial flow fan that has been conventionally used for cooling the stacked drive circuits is used as it is, the air volume is insufficient and cannot be sufficiently cooled. Therefore, it was considered to increase the number of fans or increase the output. However, in order to use it in a narrow space inside the outer case of the induction heating cooker, sufficient intake air cannot be taken and installation space is insufficient. Further, when the capacity of the fan is increased, the sound becomes louder and noise becomes a problem. Furthermore, in the induction heating cooker, it was necessary to consider the so-called overflow countermeasures in which juice and water spilled from the top plate entered through the air inlets and adversely affected electrical components.

  The present invention solves the above-described problems, and provides a cooling configuration that can provide a sufficient air volume for cooling the drive circuit with a single fan and solves the overflow problem even when the drive circuit boards are stacked on one side. With the goal.

In order to solve the above-described conventional problems, an induction heating cooker according to the present invention includes a top plate and an air inlet provided on an upper surface of an outer case, and first and second induction heating coils provided on a lower portion of the top plate. A substrate base cover supported by a spring on which the second induction heating coil is mounted, and a lower portion of the substrate base cover provided corresponding to each of the first and second induction heating coils. A power supply section in which a plurality of drive circuit boards having drive circuits for driving the first and second induction heating coils are stacked in multiple stages, and a centrifugal type for blowing air to the drive circuit boards and the first and second induction heating coils A fan, a motor for driving the centrifugal fan, a roaster, and an operation unit for operating the first and second induction heating coils and the roaster; The cooling air is taken in from a suction port provided on the upper surface of the outer case, and the cooling air discharged from the centrifugal fan is multistage. After cooling the plurality of drive circuits stacked on each other, the first induction heating coil and the second induction heating coil are cooled .

  With this configuration, the intake air can be greatly increased because air is sucked from the top and bottom of the centrifugal fan, and the partition portion prevents the turbulent flow caused by the intake air from the top and bottom intake ports, thereby cooling the partition portion with the largest exhaust amount. Cooling efficiency can be improved by making it correspond to a necessary part.

  According to the first to sixth aspects of the invention, the drive circuit can be sufficiently cooled even if the drive circuit boards are stacked in two stages.

  In addition, according to the invention described in claim 7, it is possible to suppress the scattering of water due to overflow, and to improve the reliability of the electrical component.

According to a first aspect of the present invention, there is provided a top plate and an air inlet provided on the upper surface of the outer case, a plurality of induction heating coils provided on the lower surface of the top plate, and the second induction heating coil supported by a spring. a substrate base cover but mounted on, a drive circuit for driving the substrate base and the first and second induction heating coil arranged corresponding to each of the first and second induction heating coils in the lower portion of the cover A power supply unit in which a plurality of drive circuit boards are stacked in multiple stages, a centrifugal fan that blows air to the drive circuit board and the first and second induction heating coils, a motor that drives the centrifugal fan, and a roaster If, and an operation unit for operating the said the first and second induction heating coil roaster, the centrifugal fan has an upper inlet and a lower inlet, and if the upper and lower Intake incorporating cooling air from the air inlet provided on the upper surface of the outer case and having a partition portion that partitions a, after the cooling air discharged from the centrifugal fan that cools the plurality of drive circuits stacked in multiple stages, By adopting a configuration in which the first induction heating coil and the second induction heating coil are cooled, the amount of intake air can be greatly increased because air is sucked from the upper and lower sides of the centrifugal fan, and the upper and lower air intakes are separated by the partition portion. Cooling efficiency can be improved by preventing the turbulent flow caused by the intake air from the mouth and making the partition with the largest displacement correspond to the part that needs the most cooling, and the drive circuit board is placed on one induction heating coil side. However, the drive circuit and the induction heating coil can be sufficiently cooled even if the cooling fan is replaced with one centrifugal fan.

The invention according to claim 2 is configured such that the position of the partition portion of the centrifugal fan is not lower than the position of the uppermost drive circuit board of the drive circuit boards stacked in multiple stages, so that the temperature is highest. The drive circuit of the uppermost drive circuit board can be cooled well.

According to a third aspect of the present invention, a motor is provided on the upper part of the centrifugal fan, and the cross-sectional area A of the air passage leading to the lower air inlet is made larger than the cross-sectional area B of the air passage leading to the upper air inlet. By adopting a configuration in which the intake amount from the intake port is made smaller than the intake amount from the lower intake port, the influence of pressure loss due to the motor provided on the top of the centrifugal fan is reduced, and the intake efficiency of the entire centrifugal fan is increased. can do.

According to a fourth aspect of the present invention, a motor is provided on the upper part of the centrifugal fan, the cross-sectional area A of the air passage leading to the lower air inlet is made larger than the cross-sectional area B of the air passage leading to the upper air inlet, and the upper air inlet By making the pressure loss of the air passage to the lower intake port larger than the pressure loss of the air passage to the lower intake port, the intake amount from the upper intake port is made smaller than the intake amount from the lower intake port. The air volume from the intake port can be increased.

According to a fifth aspect of the present invention, the centrifugal fan has an upper exhaust port and a lower exhaust port through which cooling air is discharged, and the partition portion is configured such that the area of the upper exhaust port is smaller than the area of the lower exhaust port. By providing the configuration, the upper drive circuit board whose temperature is high can be efficiently cooled.

The invention according to claim 6 is a water retention plate that provides a narrow gap in the air path between the outer case and the fan case, and temporarily overflows the water that spills into the top plate and flows from the intake port on the upper surface of the outer case. A water retaining plate is provided in the fan case to reduce the momentum of the overflowing water, and the temporarily stored overflowing water gradually leaks from the gap, thereby stopping the momentum of the overflowing water that has entered from the suction port. Since splashes can be reduced, the splashes are less likely to enter the power supply chamber, and damage to electrical components due to moisture can be reduced.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In addition, about the structure which has the same function as a prior art example, the same code | symbol is attached | subjected and description is abbreviate | omitted. Moreover, the external perspective view of the induction heating cooker used for this invention is the same as the external perspective view demonstrated in the prior art example, and the description is abbreviate | omitted.

  1 is a side sectional view of an induction heating cooker according to a first embodiment of the present invention. In the present embodiment, an induction heating cooker having a so-called two-hole stove having two induction heating coils will be described.

  In FIG. 1, an induction heating coil 8 is attached to a lower portion of the top plate 2 on a substrate base cover 18 by a spring 17 corresponding to the induction heating unit 3 a shown in FIG. 4. Drive circuit boards 10a and 10b having drive circuits 9a and 9b for driving the induction heating coils provided corresponding to each of the two induction heating coils by the power supply unit 19 are provided at the lower part of the substrate base cover 18, respectively. It is attached to 20a, 20b. A fan chamber 21 surrounded by a fan case 11 and a fan cover 12 is provided beside the power supply unit 19, and a centrifugal fan 22 and a motor 23 for driving the centrifugal fan 22 are provided therein. Yes.

  In the present embodiment, two induction heating coils are used, and a drive circuit board provided with a drive circuit for driving the induction heating coil is provided, and two drive circuit boards are stacked and used. It was. The conventional drive circuit board and the cooling fan have an expanded roaster portion to improve the usability of the roaster. In this configuration, the problem is how to cool the drive circuit portions of the drive circuit boards stacked in two stages. In the present embodiment, the induction heating coil 8 and the drive circuits 9a and 9b on the drive circuit boards 10a and 10b stacked in two stages require cooling. Therefore, the cooling air needs to cool the induction heating coil 8 and the two drive circuits 9a and 9b. Of these, by increasing the cooling air in the drive circuit 9a portion above the two-stage stack, the air after cooling the drive circuit 9a can be effectively turned to the induction heating coil 8, and the cooling performance of the induction heating coil 8 Can be improved.

  For this reason, in this embodiment, a centrifugal fan is used in which the wind pressure is high and the air volume can be increased and the exhaust air volume can be controlled by the position of the exhaust port, and a partition plate is provided on the sirocco fan.

  The configuration of the sirocco fan used in this embodiment will be described below.

  In FIG. 1, a sirocco fan 22 which is a centrifugal fan has two intake ports, a lower intake port 24 and an upper intake port 25. For this reason, the intake area is increased, so that a larger amount of intake air can be taken. Reference numeral 26 denotes a partition plate which prevents intake air from above and intake air from below from mixing and preventing turbulent flow. 27 is a lower exhaust port, and 28 is an upper exhaust port. The motor 23 for driving the sirocco fan 22 is for countermeasures against overflow, which will be described later, and may be provided below if sufficient countermeasures against overflow are taken. However, since the motor 23 also generates heat, the motor 23 should be provided above in order to reduce the thermal influence.

  FIG. 2 shows the air volume (displacement) characteristics of the sirocco fan 22 having such a configuration. FIG. 2 shows the relative difference in the amount of air discharged depending on the position of the partition plate 26. The horizontal axis is exhausted by the ratio of the length C from the lower intake port 24 to the partition plate 26 and the length D from the partition plate 26 to the upper intake port 25 (area ratio between the lower exhaust port and the upper exhaust port). This shows the difference in the air volume. From the figure, the amount of air discharged becomes maximum when the ratio of the length C is about 60 to 80% of the entire length (C + D). This is because there is a motor 23 at the upper part of the upper intake port 25 and the intake from the upper side is obstructed. If the motor 23 is mounted below, the length C of the lower intake port 24 and the partition plate 26 is the entire length C. It is considered that the air volume becomes maximum when the partition plate 26 is provided at a position of 20 to 40 percent of the length.

  Further, the air volume of each part of the sirocco fan 22 having the partition plate 26 is the smallest near the lower and upper intake ports 24 and 25, and the air volume increases as the partition plate 26 is approached. Since there is an air volume exhausted from both, the maximum air volume is near here. Therefore, the design that increases the cooling efficiency is such that the partition plate 26 is positioned at the position of the drive circuit 9a that requires the most cooling.

  Next, I will talk about the intake air path. The cooling air sucked from the intake port 5 of the induction heating cooker passes through the air passage 29 and then is divided into air passages 30 and 31 to reach the lower intake port 4 and the upper intake port 5 of the sirocco fan 22.

  In the present embodiment, in order to obtain a large air volume, the intake air from the upper intake port is made smaller than the intake air from the lower intake port. Specifically, the cross-sectional area A of the air passage 30 is larger than the cross-sectional area B of the air passage 31. As a result, the lower intake air amount can be increased, so that the amount of cooling air to the drive circuit 9a that is most necessary can be increased.

  Further, the influence of the pressure loss of the motor 23 can be minimized by reducing the upward air volume.

  As described above, the sirocco fan 22 used in the present embodiment has (1) a motor provided at the top as a countermeasure against overflow, (2) an upper and lower intake port and an increased intake amount, (3) a partition plate Is provided to prevent turbulent flow of intake air from above and below, and to increase the air volume distribution at the exhaust port, and in particular, the air volume in the vicinity of the partition plate is increased.

  Next, the flow of cooling air will be described.

  As indicated by the arrows, the cooling air taken from the intake port of the induction heating cooker passes through the air passage 29 and then passes through the air passages 30 and 31 to the intake ports 24 and 25 of the sirocco fan 22. Cooling air discharged from the vicinity of the partition portion of the sirocco fan 22 and the lower exhaust port 27 cools the drive circuits 9a and 9b, and then cools the induction heating coil 8 and another induction heating coil (not shown). Further, part of the cooling air discharged from the upper exhaust port 28 passes through the opening 32 and directly cools the induction heating coil 8. Therefore, in order to improve the cooling performance of the induction heating coil 8, it is necessary to increase the cooling air to the drive circuit 9a side, and the partition plate 26 is installed at the position of the drive circuit 9a to cool it. Although cooling is possible even without the partition plate 26 at this position, the cooling efficiency is improved by doing so. The exhaust amount distribution at the upper and lower exhaust ports can be easily changed by adjusting the position of the partition plate 26 and the upper and lower intake amounts, that is, determining the size of the cross-sectional area of the air passages 30 and 31 by design.

  As described above, according to the present embodiment, the cooling fan and the drive circuit board provided for each induction heating coil corresponding to each induction heating coil are arranged in two stages on one induction heating coil side. The drive circuit and the induction heating coil can be sufficiently cooled even if they are arranged in a stacked manner and the cooling fan is replaced with one centrifugal fan. Therefore, since the space between the one cooling fan and the drive circuit board is vacant, this portion can be used to increase the internal volume of the roaster.

(Embodiment 2)
FIG. 3 is a cross-sectional view of the induction heating cooker according to the second embodiment of the present invention.

  The second embodiment is different from the first embodiment in that the second embodiment adds a countermeasure against overflow to the first embodiment. Therefore, the configuration of the induction heating cooker is the same as that shown in FIG.

  The overflow problem in the induction heating cooker is that the user accidentally flips the pan during cooking, so that boiled juice or water (hereinafter referred to as water) spills into the top plate 2, which flows from the inlet 5 and collides with the outer case 1. It scatters as a splash. This splash is sucked by the sirocco fan 22 and carried to the power supply unit 19 to damage the drive circuit and other electrical components on the drive circuit board.

  Hereinafter, the overflow countermeasure in this Embodiment is demonstrated using FIG.

In FIG. 3, the water retaining plate 33 enters from the air inlet 5 and temporarily stops the water that has fallen along the outer case 1 or directly, thereby reducing the momentum of the fall and preventing the water from scattering. is there. The water retaining plate 33 is provided with a through hole 34. This allows the cooling air to pass through, and the opening area is increased so that almost no pressure loss occurs. A narrow gap 35 is provided between the water retaining plate 33 and the outer case 1. The gap 35 gradually leaks the water stored in the water retention plate 33, accumulates water in the water retention plate 33, overflows the water retention plate 33, falls from the through hole 34, and prevents the water from splashing again at this time. The purpose is that.

  As described above, the water retaining plate 33 needs to stop the momentum of the water, reduce the amount of scattering, leak the retained water, and not disturb the passage of the cooling air. The configuration is not particularly limited as long as this condition is satisfied. That is, in FIG. 3, the water retaining plate 33 is configured to be attached to the fan case 11 and the gap 35 is provided between the water retaining plate 33 and the outer case 1, but is not limited thereto. It may be attached to the outer case 1 so as to have a gap for water leakage so that a space is provided between the fan case 11 and the water retention plate 33.

  Further, in the present embodiment, the flange portion 36 is provided in the through hole portion of the fan case 11 corresponding to the lower intake port 24 of the sirocco fan 22. This prevents the splash from hitting the buttocks 36 and not being sucked into the sirocco fan 22. However, since the pressure loss increases as the length of the ridge increases, it cannot be made too long. As described above, the amount of water sucked into the sirocco fan 22 can be greatly reduced by the overflow countermeasure of the present embodiment. Therefore, the reliability of the electrical component can be greatly increased.

  In addition, in Embodiment 1, although the cooling in the case where two drive circuit boards of the induction heating cooker having a two-hole stove having two induction heating coils are stacked and used is described, the present invention is not limited to this. Absent. In particular, since the sirocco fan used in the first embodiment has intake ports at the top and bottom, the intake air amount in a narrow space such as the inside of the outer case can be kept, and the exhaust air amount (cooling air amount) is distributed, so that the temperature is high. A part with a large exhaust air volume can be applied to the. Therefore, even when one drive circuit board of a single-point stove or a drive circuit board of a two-point stove is cooled separately for each sheet, a large cooling effect can be obtained by using the sirocco fan shown in the first embodiment. it can. For this reason, the temperature rise of a drive circuit and an induction heating coil can be suppressed, and reliability can be improved. Further, the temperature rise of the induction heating coil can be suppressed, and the cost can be reduced by changing the insulation section of the winding from H type to F type or reducing the wire diameter of the winding depending on the design.

  Further, even when a sirocco fan is provided corresponding to one drive circuit board, the motor for driving the sirocco fan described in the first embodiment is provided on the upper part of the sirocco fan, and the intake air from the upper intake port of the sirocco fan is lowered. Decrease the amount of air intake from the air intake, make the airway pressure loss to the upper air intake of the sirocco fan larger than the airway pressure loss to the lower air intake, or the area of the upper air outlet of the sirocco fan is lower Cooling efficiency can be further improved by adopting a configuration in which a partition portion is provided so as to be smaller than the area of the exhaust port. Further, as described in the second embodiment, a water flow plate for temporarily storing overflow is provided in the air passage between the outer case and the fan case, and the overflow stored between the flow plate and the outer case is gradually increased. By adopting a configuration in which a gap is provided so as to be drunk, or a configuration in which a flange is provided in the air passage corresponding to the lower intake port of the centrifugal fan of the fan case, the same overflow countermeasure as in the second embodiment can be obtained. Needless to say.

  As described above, the induction heating cooker according to the present invention can be applied to applications that increase the cooling efficiency of the induction heating coil and its drive circuit board, and increase the reliability of electrical components against overflowing water that enters from the air inlet. Can do.

Side surface sectional drawing of the induction heating cooking appliance of Embodiment 1 of this invention The figure which shows the relationship between the partition plate position of the sirocco fan of the same induction heating cooking appliance, and exhaust air volume Side surface sectional drawing of the induction heating cooking appliance of Embodiment 2 of this invention External perspective view of induction heating cooker Side sectional view of a conventional induction heating cooker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer case 2 Top plate 5 Air inlet 6 Roaster 7 Operation part 8 Induction heating part 9a, 9b Drive circuit 10a, 10b Drive circuit board 19 Power supply part 22 Sirocco fan (centrifugal fan)
DESCRIPTION OF SYMBOLS 23 Motor 24 Lower intake port 25 Upper intake port 26 Partition plate 27 Lower exhaust port 28 Upper exhaust port 30 Air path 33 Water retention plate 35 Clearance 36 Gutter part

Claims (6)

The top plate and the air inlet provided on the upper surface of the outer case, the first and second induction heating coils provided at the lower part of the top plate, and the second induction heating coil supported by a spring are mounted on the top. A plurality of drive circuits having a substrate base cover and a drive circuit provided below the substrate base cover so as to correspond to each of the first and second induction heating coils and driving the first and second induction heating coils A power supply unit in which substrates are stacked in multiple stages, a centrifugal fan that blows air to the drive circuit substrate and the first and second induction heating coils, a motor that drives the centrifugal fan, a roaster, and the first And an operation unit for operating the second induction heating coil and the roaster, and the centrifugal fan has an upper intake port and a lower intake port, and partitions intake air from above and below The cooling air is taken in from an air inlet provided on the upper surface of the outer case and has a cut portion, and the cooling air discharged from the centrifugal fan cools the plurality of drive circuits stacked in multiple stages, and then An induction heating cooker configured to cool the induction heating coil and the second induction heating coil. The induction heating cooker according to claim 1, wherein the position of the partition portion of the centrifugal fan is configured not to be lower than the position of the uppermost drive circuit board of the drive circuit boards stacked in multiple stages. A motor is provided on the upper part of the centrifugal fan, and the cross-sectional area A of the air passage leading to the lower air inlet is made larger than the cross-sectional area B of the air passage leading to the upper air inlet, thereby reducing the intake amount from the upper air inlet. induction heating cooker according to claim 1 or 2 has a structure to decrease the intake amount from the intake port. A motor is provided in the upper part of the centrifugal fan so that the cross-sectional area A of the air passage leading to the lower intake port is made larger than the cross-sectional area B of the air passage leading to the upper intake port, and the pressure loss of the air path to the upper intake port is reduced to the lower intake air The induction heating cooker according to claim 3 , wherein the intake air amount from the upper intake port is made smaller than the intake air amount from the lower intake port by making it larger than the pressure loss of the air passage to the mouth. The centrifugal fan has an upper exhaust port and a lower exhaust port for discharging cooling air, and a partition is provided so that an area of the upper exhaust port is smaller than an area of the lower exhaust port. The induction heating cooker according to any one of 1 to 4 . A water retaining plate that provides a narrow gap in the air passage between the outer case and the fan case, and temporarily stores the overflow that is spilled into the top plate and flowing from the air inlet on the upper surface of the outer case. The induction heating cooker according to any one of claims 1 to 5 , wherein a water retention plate that reduces water is provided in the fan case so that the temporarily stored overflow gradually leaks from the gap.

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