JP6840109B2 - Induction heating cooker - Google Patents

Description

The present invention relates to an induction cooker.

There are two types of induction heating cookers, one is a model without a grill for grilling fish and the other is a model with a grill for grilling fish. In the model equipped with the grill storage, there is a problem that the temperature of the parts arranged above the grill storage becomes high when cooking is performed in the grill storage.

As a solution to this problem, in Patent Document 1, in order to reduce the temperature of the heating coil above the grill and the pot temperature detection device (infrared sensor) provided on the heating coil, the cooling air is blown above the grill. It is covered with a flowing duct, and an outlet for blowing cooling air from the duct is provided at a position below the heating coil to cool the heating coil and the pan temperature detector (infrared sensor). Therefore, even when the grill is used for cooking, by covering it with a duct that allows cooling air to flow above the grill, even if the temperature of the upper surface of the grill becomes high and radiant heat is generated, the cooling air will be generated. The pan temperature detector will not be overheated by being blocked by the flowing duct.

Japanese Unexamined Patent Publication No. 2016-162703

In Patent Document 1 described above, since there is a gap for providing a duct (ventilation duct) between the heating coil and the grill (heating chamber), a duct through which cooling air flows can be provided up to the lower surface of the heating coil. This makes it possible to directly cool the heating coil and the infrared sensor and block the radiant heat generated during cooking in the grill by the duct.

However, when the gap between the heating coil and the grill storage becomes small, there arises a problem that this duct cannot be provided above the grill storage. In that case, the infrared sensor, which is particularly sensitive to heat, is exposed to a high temperature, which may adversely affect the temperature detection performance and life of the infrared sensor.

An object of the present invention is to reduce the ambient temperature of an infrared sensor located above the grill.

In order to solve the above problems, the induction heating cooker according to the present invention is arranged in a main body, a grill storage built in the main body, a top plate installed above the main body, and below the top plate. A plurality of heating coils, an infrared sensor unit arranged below the heating coil, a fan device for blowing cooling air, a duct for guiding the cooling air to the heating coil arranged above the grill, and the grill. A partition plate is provided above the storage, and the partition plate has a concave shape that matches the convex shape of the lower surface of the infrared sensor unit.

According to the present invention, the atmospheric temperature of the infrared sensor located above the grill can be reduced.

Perspective view of induction heating cooker Internal explanatory view of induction heating cooker Front sectional view cut along the line CC shown in FIG. Front sectional view cut along the line AA shown in FIG. Explanatory view of the side surface cut by the BB line shown in FIG. Explanatory view of the part excluding the heating coil on the left side as seen from above

Hereinafter, examples of the present invention will be described with reference to the drawings and the like. The following description shows specific examples of the contents of the present invention, and the present invention is not limited to these descriptions. Various changes and modifications can be made by those skilled in the art within the scope of the technical ideas disclosed in the present specification, and it is planned from the beginning that the configurations of the following examples are appropriately combined. Further, in all the drawings for explaining the present invention, those having the same function may be designated by the same reference numerals, and the repeated description thereof may be omitted.

FIG. 1 is a perspective view of an induction heating cooker. The main body 1 of the induction heating cooker is provided with a grill storage 4 for heating an object to be cooked (not shown) with an electric heater or the like, and generates an eddy current at the bottom of a metal cooking pot (not shown). The present invention shows a stationary type induction heating cooker that heats a cooking pot by Joule heat generated by this eddy current. In addition, front and back, up and down, left and right are defined as shown in FIG. 1 and the like with reference to the line of sight of the user facing the induction heating cooker.

The grill storage 4 on the left side of the front surface of the main body 1 is provided with a door portion 41 on the front surface for installing a food to be cooked (not shown) by sliding back and forth.

The top plate 2 is composed of a plate-shaped glass (not shown) on which a cooking pot is placed and a frame portion (not shown) that holds the four sides of the plate-shaped glass so as to cover the main body 1 from above. It is installed.

The top plate 2 has a two-port pot mounting portion 21 corresponding to the installation positions of two heating coils 3a and 3b (shown in FIG. 2), which will be described later, and an operation unit for adjusting the heating / cooling of the cooking pan. It has 22 and an exhaust opening 23. In the exhaust opening 23, an exhaust cover 24 provided with a plurality of holes for exhausting air blown out from a fan device 7 (shown in FIG. 3), which will be described later, is placed.

FIG. 2 is an internal explanatory view of the induction heating cooker. In this induction heating cooker, a grill storage 4 is installed on the left side, a substrate case 6 is installed on the right side, a heating coil 3 and the like are installed above them, and the above-mentioned top plate 2 is installed so as to cover the lid from above. .. The heating coils 3 (3a, 3b) generate an eddy current by passing a high-frequency current of, for example, about 20 kHz to 40 kHz and changing the magnetic flux with time.

The heating chamber 42 of the grill storage 4 is a space for arranging an object to be cooked such as fish, and has an electric heater (upper heater 43 and lower heater 44 described later) as a heat source and a grill plate 45. There is.

The heating coil 3 includes a coil 35 wound with a litz wire through which a high-frequency current flows by driving an inverter circuit (a substrate 5 described later), a coil base 31 on which the coil 35 is placed, and a magnetic shield ring 36 on the outer periphery of the coil 35. A terminal 37 for connecting a circuit from the inverter circuit is provided on the lower surface side of the coil base 31. The heating coil 3 is supported by springs (not shown) at three support portions provided on the coil base 31, and an upward urging force is applied by the springs. As a result, the heating coil 3 is pressed against the lower surface of the top plate 2, and the distance between the cooking pan and the heating coil 3 is kept constant.

The heating coil 3 is an infrared sensor unit having a temperature sensor 33 on the upper surface of the heating coil 3 for detecting the temperature of the bottom of the pot and an infrared sensor for detecting infrared rays radiated from the bottom of the pot placed on the top plate 2. 34 is installed.

In this embodiment, the heating coil 3b is provided above the substrate case 6 described later on the right side in a plan view, and the heating coil 3a is provided above the grill storage 4 on the left side.

Next, a configuration for cooling the heating coil 3 and the infrared sensor unit 34 will be described.

First, the air passage in the substrate case 6 will be described with reference to FIGS. 3 and 4.

FIG. 3 is a front sectional view taken along the line CC shown in FIG. The substrate case 6 houses a substrate 5 on which an inverter circuit for supplying power to the heating coil 3 and a control circuit for controlling the inverter circuit are mounted, and a fan device 7 for blowing cooling air to the substrate 5 and the heating coil 3. ing. The fan device 7 discharges cooling air from the ejection port 7a to cool the substrate 5. However, the fan device 7 does not necessarily have to be housed in the board case 6, and may be provided independently.

In the substrate case 6, two types of substrates 5, the substrate 5a and the substrate 5b, are stacked in two stages, and the substrate 5a is provided on the lower stage side and the substrate 5b is provided on the upper stage side. The space in which the substrate 5 of the substrate case 6 is housed is substantially partitioned by the substrate 5b, and the lower space 6a in which the substrate 5a is housed on the lower stage side and the surface of the substrate 5b and the components arranged on the substrate 5b on the upper stage side. Is divided into the upper space 6b, which is desired. The solder surface of the substrate 5b faces the lower space 6a.

FIG. 4 is a front sectional view taken along the line AA shown in FIG. In order to cool the heating coil 3b provided above the substrate case 6, a ejection hole 6c communicating with the upper space 6b is provided above the substrate case 6. Further, in order to send cooling air to the heating coil 3a provided above the grill storage 4, a duct connection port 6d communicating with the lower space 6a is provided on the grill storage 4 side of the substrate case 6. Further, the cooling air is blown to both the lower space 6a and the upper space 6b from the ejection port 7a of the fan device 7 at the same time.

Next, the air passage configuration and the flow of the cooling air will be described with reference to FIGS. 3 and 4.

The low-temperature cooling air sucked by the fan device 7 from the outside of the induction heating cooker is blown from the ejection port 7a of the fan device 7 to both the lower space 6a and the upper space 6b in which the substrate 5 is housed. It is blown at the same time. First, the cooling air blown into the upper space 6b cools the substrate 5b, passes through the ejection hole 6c, cools the heating coil 3b and the infrared sensor unit 34 provided on the lower surface of the heating coil 3b, and exhausts the cooling air. It is exhausted to the outside of the induction heating cooker through the opening 23. Next, the cooling air blown into the lower space 6a, after cooling the substrate 5a, passes through the duct 8 from the duct connection port 6d, and from the ejection port 8a of the duct 8 to the lower surface of the coil base 31 of the heating coil 3a. Air is blown between the partition plate 9 to cool the heating coil 3a and the infrared sensor unit 34 provided on the lower surface of the heating coil 3a, and the infrared sensor unit 34 is exhausted to the outside of the induction heating cooker through the exhaust opening 23.

Let the two independent air passages pass through the upper space 6b described above as the air passage B, and the air passage passing through the lower space 6a described later as the air passage A.

Inside the main body 1, there are parts that require a lot of cooling air because the atmospheric temperature is high, parts that require a lot of cooling air because the heat generation is large, parts that are placed in an environment with a low atmospheric temperature, parts that generate a small amount of heat, etc. It is mixed. For example, in the heating coil 3 having the same heating output, the ambient temperature around the heating coil 3a above the grill storage 4 is higher than that around the heating coil 3b when the grill storage 4 is used. Become. Therefore, the infrared sensor unit 34 provided on the lower surface of the heating coil 3a requires more cooling air than the infrared sensor unit provided on the lower surface of the heating coil 3b. Further, in the circuit section, a large amount of cooling air is required because the electronic components that carry the power supply and the electronic components that carry the inverter circuit that generate the electric power to flow to the coil 35 generate a large amount of heat.

Therefore, the parts that require a lot of cooling air and other parts are classified, and the heating coil 3a that requires a lot of cooling air and the electronic parts that carry the power supply and the inverter circuit described above are arranged in the air passage A. Parts are arranged in the air passage B, and each part is efficiently cooled by one fan device 7. The air volume of the cooling air flowing between the air passage A and the air passage B is such that the air passage cross-sectional area of the air passage A is three times or more the air passage cross-sectional area of the air passage B at the outlet of the fan device 7. A allows the cooling air to flow three times or more as much as the air passage B.

Next, cooling of the heating coil 3a and the infrared sensor unit 34 will be described by taking the heating coil 3a on the left side as an example.

FIG. 5 is an explanatory view of a side surface cut along the line BB shown in FIG. First, a partition plate 9 that covers the upper surface of the grill storage 4 is arranged, and an air layer 102 is provided between the grill storage 4 and the partition plate 9. The air layer 102 can reduce the radiant heat from the grill 4 to the infrared sensor unit 34. Then, a heating coil base 10 for supporting the heating coil 3a is arranged on the partition plate 9.

An infrared sensor unit 34 is provided on the lower surface on the rear side of the heating coil 3a. Therefore, when the heating coil 3a and the infrared sensor unit 34 are integrated, the rear side of the lower surface projects downward in a convex shape.

Therefore, for example, when the partition plate 9 is flat, if cooling air is blown between the heating coil 3a and the partition plate 9, the cooling air flows to the side without the infrared sensor unit 34 having a small flow path resistance, and infrared rays are emitted. There arises a problem that the sensor unit 34 cannot be cooled efficiently.

Therefore, in order for the cooling air to efficiently flow around the infrared sensor unit 34, particularly on the side surface of the infrared sensor unit 34, the heating coil 3a and the infrared sensor unit 34 are integrated to match the convex shape of the lower surface. , The partition plate 9 is provided with a recess 9a. As a result, the flow path resistance of the air passage 101c on the side surface of the infrared sensor unit 34 is reduced, and the flow path resistance of the air passage 101b without the infrared sensor unit 34 is relatively increased (the length of the air passage 101b < The length of the air passage 101c). That is, the distance from the grill storage 4 to the partition plate 9 is longer below the portion where the infrared sensor unit 34 is not provided than below the portion where the infrared sensor unit 34 is provided. As a result, the cooling air efficiently flows through the infrared sensor unit 34, and the infrared sensor unit 34 can be efficiently cooled.

Further, the portion where the flow path resistance cannot be reduced, and in this embodiment, the gap (air passage 101a) between the bottom surface of the infrared sensor unit 34 and the recess 9a cannot be made large. Therefore, in the partition plate 9, the recess 9a portion and the windward surface of the cooling air flowing into the recess 9a are formed as an integral metal. As a result, the recess 9a of the partition plate can be efficiently cooled by the cooling air, and the temperature on the bottom surface side of the infrared sensor unit 34 can be cooled.

The heating coil base 10 includes a holding portion 10a (not shown) for holding springs (not shown) for supporting the three supporting portions provided on the coil base 31 of the heating coil 3a, and terminals of the heating coil 3a. An insulating portion 10c for maintaining insulation between the 37 and the partition plate 9 is provided. Further, when the cooling air blown between the heating coil 3a and the heating coil base 10 flows out from the outer peripheral direction of the heating coil 3a, the rectifying wall 10b is raised so that the lower surface of the heating coil 3a can be efficiently cooled. There is. As a result, the cooling air is pushed up to the heating coil 3a side, the cooling air flows to the heating coil 3a side, and the heating coil 3a can be efficiently cooled. Further, the insulating portion 10c is provided with an inclined portion 10d along the flow of the cooling air so that the cooling air flows toward the infrared sensor unit 34 side more than the portion where the infrared sensor unit 34 is not provided.

Further, the heating coil base 10 is made of resin, and the radiant heat from the grill storage 4 to the heating coil 3a can be reduced.

FIG. 6 is an explanatory view of a portion excluding the heating coil 3a on the left side as viewed from above. The cooling air from the duct connection port 6d (shown in FIG. 4) of the substrate case 6 to the heating coil 3a passes through the duct 8 from the duct connection port 6d, passes through the ejection port 8a of the duct 8, and passes through the heating coil 3a. It is guided to the vicinity of the outer shell. The ejection port 8a is located below the lower surface of the coil base 31 of the heating coil 3a so that the cooling air flows into the lower surface of the heating coil 3a.

From the above configuration, the flow of the cooling air that is blown from the ejection port 8a of the duct 8 and flows between the lower surface of the coil base 31 of the heating coil 3a and the partition plate 9 will be described.

The cooling air cools the partition plate 9 made of a metal plate, thereby reducing the temperature rise on the bottom surface side of the infrared sensor unit 34.

Further, the infrared sensor unit 34 can be efficiently cooled by flowing a large amount of cooling air through the air passage 101c having a small air passage resistance on the side surface side of the infrared sensor unit 34.

Further, the cooling air is collected toward the infrared sensor unit 34 by the inclined portion 10d provided in the insulating portion 10c. As a result, the temperature rise of the infrared sensor unit 34 can be reduced.

The cooling air that cools the infrared sensor unit 34 cools the coil 35 when it passes through the gap between the coils 35 (particularly between the inner coil and the outer coil) and the gap between the top plate 2 and the upper surface of the heating coil 3a. Then, when passing between the lower surface of the heating coil 3a and the rectifying wall 10b provided on the heating coil base 10, the lower surface of the heating coil 3a is cooled and then discharged through the exhaust opening 23.

According to the present invention, it is possible to reduce the atmospheric temperature of the infrared sensor located above the grill even when cooking in the grill, and it is possible to accurately detect the temperature of the bottom of the pot.

1 ... Main body 2 ... Top plate 3 (3a, 3b) ... Heating coil 4 ... Grill storage 5 (5a, 5b) ... Board 6 ... Board case 6a ... Lower space 6b ... Upper space 6c ... Ejection hole 6d ... Duct connection port 7 ... Fan device 8 ... Duct 9 ... Partition plate 9a ... Partition plate recess 10 ... Heating Coil stand 10b ... Rectifying wall 10c ... Insulation part 10d ... Inclined part 21 ... Pot mounting part 22 ... Operation part 23 ... Exhaust opening 24 ... Exhaust cover 31 ... Coil base 33 ... Temperature sensor 34 ... Infrared sensor unit 35 ... Coil 41 ... Door 42 ... Heating chamber 101 (101a, 101b, 101c) ... Air duct 102 ... Air layer

Claims (6)

With the main body
With the grill storage built into the main body,
With the top plate installed above the main body,
A plurality of heating coils arranged below the top plate,
An infrared sensor unit arranged below the heating coil and
A fan device that blows cooling air and
A duct that guides cooling air to the heating coil arranged above the grill and
A partition plate is provided above the grill.
The partition plate is an induction heating cooker, characterized in that it has a concave shape that matches the convex shape of the lower surface of the infrared sensor unit. In the induction heating cooker according to claim 1,
A board case that houses multiple boards and has an upper space and a lower space is provided.
An ejection hole communicating with the upper space is provided in the upper part of the substrate case.
A duct connection port communicating with the lower space is provided on the grill storage side of the substrate case.
An induction heating cooker comprising a duct for guiding cooling air from the duct connection port to the heating coil arranged above the grill. In the induction heating cooker according to claim 1 or 2.
A heating coil stand for supporting the heating coil is provided above the partition plate.
The heating coil stand
It is provided with an insulating portion that maintains the insulation between the heating coil and the partition plate.
The insulating portion is an induction heating cooker, characterized in that the insulating portion is provided with an inclined portion so that more cooling air flows toward the infrared sensor unit side than a portion where the infrared sensor unit is not provided. In the induction heating cooker according to claim 3.
The heating coil stand is an induction heating cooker provided with a rectifying wall raised so that cooling air flows on the heating coil side. In the induction heating cooker according to claim 3 or 4.
An induction heating cooker, characterized in that the heating coil base is made of resin. In the induction heating cooker according to any one of claims 1 to 5.
An induction heating cooker, wherein the partition plate is made of metal at least from the lower portion to the upstream portion of the infrared sensor unit.

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