JP6253539B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker that can efficiently blow cooling air to an induction heating coil disposed above a roaster section having a high ambient temperature.

  This type of induction heating cooker includes a plurality of induction heating coils, a drive circuit board for supplying current to the induction heating coils, an induction heating coil, and a drive circuit in a main body formed by a top plate and an outer casing. A cooling fan for cooling the substrate, a substrate case for storing the drive circuit substrate, and a roaster unit are provided, and induction heating coils are arranged at a plurality of locations including above the roaster unit. And in such a thing, by providing a branch guide in the middle of the cooling air passage of the induction heating coil and supplying the cooling air to other induction heating coils, the cooling performance can be improved for a plurality of induction heating coils. Some have been made to increase (for example, see Patent Document 1).

JP 2007-31213 A (summary, FIG. 1)

  However, in the case where a branch guide is provided in the middle of the cooling air passage of the induction heating coil so that the cooling air is supplied also to the other induction heating coils, the induction above the roaster section where the ambient temperature is high. The amount of cooling air to the heating coil is reduced.

  In addition, since the drive circuit board is installed up to the front side of the main body, when the air path is provided, the air path must be bent. Therefore, the bending loss of an air path is large and cannot blow efficiently.

  The technical problem of the present invention is to make it possible to increase the amount of cooling air to the induction heating coil above the roaster section having a high atmospheric temperature while reducing the bending loss of the air passage.

  An induction heating cooker according to the present invention includes a plurality of induction heating coils, a drive circuit board that supplies current to the induction heating coils, and an induction heating coil and a drive in a main body formed by a top plate and an outer casing. A cooling fan that cools the circuit board, a board case that houses the drive circuit board, and a roaster unit are provided. At least one coil is arranged above the substrate case and one coil above the roaster unit. Between the cooling fan and the induction heating coil on the roaster unit side, the coil passes from the cooling fan through the substrate case to the roaster unit side. A first air passage leading to the induction heating coil is provided, and on the downstream side of the substrate case of the first air passage, the air blown from the cooling fan and cooled the drive circuit board is guided to the roaster section side. In which the chamber to direct only to the heating coil is provided.

  In the induction heating cooker of the present invention, the wind that is blown from the cooling fan and cools the drive circuit board in the board case is stored in one end in the chamber on the downstream side of the board case and expanded, and then is shunted from there. Without being blown to the induction heating coil above the roaster section. Therefore, the bending loss of the air path from the cooling fan to the induction heating coil on the roaster section side is reduced, and the cooling air volume to the induction heating coil above the roaster section where the ambient temperature is high can be increased, and the cooling efficiency Will improve.

It is a longitudinal cross-sectional view of the side view which shows the flow of the wind of the wind path part of the induction heating cooking appliance which concerns on embodiment of this invention. It is a perspective view which removes and shows the top plate of the induction heating cooking appliance concerning the embodiment of the present invention.

The present invention will be described below with reference to illustrated embodiments.
FIG. 1 is a longitudinal sectional view in side view showing the flow of air in the air passage portion of the induction heating cooker according to the embodiment of the present invention. FIG. 2 is a perspective view showing the induction cooking device according to the embodiment of the present invention with the top plate removed.
As shown in FIGS. 1 and 2, the induction heating cooker according to the embodiment of the present invention is a main body formed by a top plate 1 and an outer casing 2 having an intake port 2a and an exhaust port 2b on the back side. 3, a plurality of induction heating coils 4a, 4b, 4c and drive circuit boards 5a, 5b for supplying current to the induction heating coils 4a, 4b, 4c are arranged. Further, in the main body 3, a cooling fan 6 that cools the induction heating coils 4a, 4b, and 4c and the drive circuit boards 5a and 5b, a board case 7 that houses the drive circuit boards 5a and 5b, and a roaster unit 8 are provided. Is arranged.

  As shown in FIG. 2, one induction heating coil 4b among the plurality of induction heating coils 4a, 4b, and 4c is arranged on the right side as viewed from the front, that is, above the substrate case 7, and another one induction heating coil. The coil 4a is disposed on the left side when viewed from the front, that is, above the roaster section 8 having a high ambient temperature. Furthermore, the other one induction heating coil 4c is arranged at the center when viewed from the front, that is, at the rear position between the induction heating coil 4a and the induction heating coil 4b.

  Between the cooling fan 6 and the induction heating coil 4a on the roaster section side, a cooling air path from the cooling fan 6 through the substrate case 7 to the induction heating coil 4a on the roaster section side, that is, a first air path 10 is provided. It has been. In addition, on the downstream side of the substrate case 7 in the first air passage 10, that is, on the upper portion of the substrate case 7, the air that has been blown from the cooling fan 6 and has cooled the drive circuit board 5 a is not shunted to the roaster portion side. A chamber 20 that is directed only to the induction heating coil 4a is provided. The chamber 20 has a function of reducing the bending loss of the air path by accumulating and expanding the wind that has been blown from the cooling fan 6 and has cooled the drive circuit board 5a.

  Electronic components 11a and 11b having heat sinks 9a and 9b are mounted on the drive circuit boards 5a and 5b.

  The chamber 20 is disposed above the substrate case 7, and the bottom surface 20 a of the chamber 20 forms a part of the first air passage 10 together with the substrate case 7. A part of the first air passage 10 formed by the chamber 20 and the substrate case 7 surrounds the heat sink 9a on the drive circuit substrate 5a up to the upstream half thereof. Thereby, the wind which came out of the cooling fan 6 can be efficiently introduce | transduced into the heat sink 9a. Here, a description will be given by taking as an example a case where up to half of the upstream side of the heat sink 9a on the drive circuit substrate 5a is surrounded by a part of the first air passage 10 formed by the chamber 20 and the substrate case 7. However, the present invention is not limited to this. If at least the cooling air introduction part of the heat sink 9a is surrounded by a part of the first air passage 10 formed by the chamber 20 and the substrate case 7, the wind from the cooling fan 6 is efficiently transferred to the heat sink 9a. The intended purpose of introduction can be achieved.

  Between the cooling fan 6 and the induction heating coil 4b on the substrate case 7 side, the cooling air from the cooling fan 6 is sent to the space 30a in front of the chamber in which the operation substrate 13 as a control substrate in the substrate case 7 is disposed. A cooling air passage that is directed to the induction heating coil 4b on the substrate case 7 side, that is, a second air passage 30 is provided independently.

  A slope 20b that is inclined toward the induction heating coil 4b on the substrate case 7 side is formed on the front side of the upper surface of the chamber 20 that forms the space 30a. Thereby, an air path spreads and it becomes easy to flow cooling air, the bending loss of an air path can be reduced, and cooling efficiency improves.

The substrate case 7 is divided into an upper chamber 7a and a lower chamber 7b. The upper chamber 7a stores the drive circuit board 5a, and the lower chamber 7b stores the drive circuit board 5b. . The upper chamber 7 a forms part of the first air passage 10, and the lower chamber 7 b forms part of the second air passage 30.
In other words, the first air passage 10 is an independent air passage from the cooling fan 6 through the upper chamber 7a of the substrate case 7 to the induction heating coil 4a on the roaster section side.
The second air passage 30 is an independent air passage from the cooling fan 6 through the lower chamber 7b of the substrate case 7 to the induction heating coil 4b through the space 30a in front of the chamber.
In this way, by forming two air paths composed of the upper chamber 7a and the lower chamber 7b in a single substrate case 7, the number of air path components can be reduced, and the air path can be made compact. Can be.

  The cooling fan 6 is composed of a sirocco fan defined by the partition plate 12 into two impellers 6a and 6b. One impeller 6a is disposed in the first air passage 10 and the other impeller 6b. Is disposed in the second air passage 30. As a result, only one fan motor 6c is required for the two independent air passages and the two impellers 6a and 6b, the number of fan motors 6c can be reduced, and the air passage can be reduced in size.

Next, operation | movement of the induction heating cooking appliance of this Embodiment is demonstrated.
First, a user places an object to be heated (not shown) on the induction heating coil 4a, 4b or 4c of the top plate 1, operates an operation unit (not shown), sets induction heating, and cooks. When started, the drive circuit boards 5a and 5b output control signals to the corresponding induction heating coils 4a, 4b or 4c. By this control signal, the induction heating coil 4a, 4b or 4c generates a magnetic flux by flowing a high-frequency current therein, and an eddy current flows through the heated object by this magnetic flux, and the heated object itself generates heat and is heated.

  When cooking is started, the drive circuit boards 5a and 5b simultaneously output a control signal to the cooling fan 6, and the cooling fan 6 is driven by this control signal, and the outside air is drawn from the intake port 2a as shown in FIG. Inhale and start blowing.

The air blown by the cooling fan 6 flows through two independent air passages, that is, the first air passage 10 and the second air passage 30. Among them, the cooling air flowing into the first air passage 10 cools the heat sink 9a in the upper chamber 7a of the substrate case 7 as shown in FIGS. 1 and 2, and enters the chamber 20 from the upper chamber 7a. The air is blown toward the induction heating coil 4a on the roaster section side without being diverted from 20 to the other, and the induction heating coil 4a is cooled and exhausted from the exhaust port 2b. For this reason, the amount of cooling air to the induction heating coil 4a above the roaster section 8 having a high ambient temperature can be increased, the cooling efficiency can be improved, and the product life can be extended.
Further, while the cooling air flows through the first air passage 10, one end of the cooling air is accumulated in the chamber 20 to be expanded, and the bending loss of the air passage is reduced.
Thus, the amount of cooling air to the induction heating coil 4a above the roaster section 8 having a high atmospheric temperature can be increased while reducing the bending loss of the air path.

  The cooling air that has flowed into the second air passage 30 cools the heat sink 9b in the lower chamber 7b of the substrate case 7 as shown in FIGS. 1 and 2, and the substrate case 7 side from the lower chamber 7b. The induction heating coil 4b is blown toward the induction heating coil 4b through the space 30a in front of the chamber where the inclined surface 20b inclined toward the induction heating coil 4b is formed, and during this time, the operation substrate 13 and the induction heating coil 4b are cooled, It exhausts from the exhaust port 2b. Thereby, the air that has been blown from the cooling fan 6 and has cooled the heat sink 9b on the drive circuit board 5b can be efficiently blown to the induction heating coil 4b disposed above the board case 7 to be cooled.

  1 top plate, 2 outer casing, 2a intake port, 2b exhaust port, 3 main body, 4a, 4b, 4c induction heating coil, 5a, 5b drive circuit board, 6 cooling fan, 6a, 6b impeller, 6c fan motor, 7 Substrate case, 7a Upper chamber, 7b Lower chamber, 8 Roaster section, 9a, 9b Heat sink, 10 First air path, 11a, 11b Electronic component, 12 Partition plate, 13 Operation board (control board), 20 Chamber, 20a bottom surface, 20b slope, 30 second air passage, 30a space.

Claims (6)

Cooling for cooling a plurality of induction heating coils, a drive circuit board for supplying current to the induction heating coil, and the induction heating coil and the drive circuit board in a main body formed by a top plate and an outer casing. A fan, a board case for housing the drive circuit board, and a roaster unit;
The roaster portion and the substrate case are arranged on the left and right in the main body as viewed from the front,
The plurality of induction heating coils are disposed at least one above the substrate case and one above the roaster unit,
Between the cooling fan and the induction heating coil on the roaster part side, a first air path is provided from the cooling fan through the substrate case to the induction heating coil on the roaster part side,
On the downstream side of the substrate case of the first air path, a chamber is provided that directs the air that is blown from the cooling fan and cools the drive circuit board toward the induction heating coil on the roaster section side. An induction heating cooker characterized by that. The drive circuit board is mounted with an electronic component having a heat sink,
The chamber is disposed above the substrate case, and the bottom surface of the chamber forms a part of the first air path together with the substrate case,
2. The cooling air introduction portion of at least the heat sink on the drive circuit board is surrounded by a part of the first air path formed by the chamber and the substrate case. Induction heating cooker.   Between the cooling fan and the induction heating coil on the substrate case side, the cooling air from the cooling fan is passed through the space in front of the chamber in which the control board in the substrate case is disposed. 3. The induction heating cooker according to claim 1, wherein a second air path directed to the induction heating coil on the side is provided independently. 4.   The induction heating cooker according to claim 3, wherein a slope inclined toward the induction heating coil on the substrate case side is formed on the front side of the upper surface of the chamber. The substrate case is divided into an upper chamber and a lower chamber,
The upper chamber forms part of the first air passage;
The induction heating cooker according to claim 3 or 4, wherein the lower chamber forms part of the second air passage.   The cooling fan is configured by a sirocco fan defined by partition plates into two impellers, one impeller is disposed in the first air passage, and the other impeller is the second impeller. It is arrange | positioned in an air path, The induction heating cooking appliance in any one of Claims 3-5 characterized by the above-mentioned.

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