JP4206416B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker.

  The induction heating cooker is a device that performs cooking by using Joule heating due to eddy current generated in the bottom of a pan when magnetic lines generated by flowing a high-frequency current through an induction heating coil pass through a metal pan. Since heat is generated not only from the pan but also from an induction heating coil and an electronic board that controls the induction heating coil during heating, ventilation cooling is performed using a fan.

  A conventional ventilation structure of an induction heating cooker uses an axial flow fan or a multi-blade fan to pass cooling air sucked from an air inlet through an electronic board and further through an induction heating coil. Examples of such a ventilation structure include those disclosed in Patent Document 1 and Patent Document 2.

JP 2004-39263 A (Page 9, FIG. 2) JP 2002-110329 A (6th page, FIG. 1)

  In recent years, induction heating cookers tend to have higher output due to demands for shortening cooking time. In addition, regarding the types of pans used, not only iron pans that can be heated with high efficiency, but also nonmagnetic stainless steel pans that have reduced heating efficiency are being used.

  As described above, the example of the blower structure in the induction heating cooker disclosed in Patent Document 1 allows the cooling air sucked from the intake port by the axial fan to pass through the electronic board and the induction heating coil. Since the induction heating cooker has a high mounting density of equipment inside the main body, the ventilation resistance is large, the operating point is close to the cutoff point as shown in FIG. 2, and noise is increased when an axial fan is used. There was a problem.

  Moreover, the example of the ventilation structure in the induction heating cooking appliance disclosed by patent document 2 ventilates the cooling air suck | inhaled from the inlet port with the horizontal type multiblade fan to an electronic board | substrate and an induction heating coil. In general, a multiblade fan is widely used for indoor ventilation because the air volume and pressure can be increased with respect to the size of the fan.

  However, as shown in FIG. 3, since the impeller is a forward-facing blade in which the rotation direction of the impeller coincides with the exit direction of the blade, there is a characteristic that the absolute speed C2 of the impeller exit becomes very large. Induction heating cookers often have a structure in which the mounting density in the main body is high and an electronic board component having a high heat generation density is installed directly under the outlet of the multiblade fan. In such a case, there is a problem that the flow inside the fan casing is adversely affected, the ventilation resistance is increased, and the noise source becomes a local noise source.

  In addition, in a multiblade fan, there is only one outlet for each impeller, so the arrangement of components that generate a large amount of heat in the electronic board is concentrated on only one outlet, and the degree of freedom in the arrangement of electronic board components is reduced. There was a problem of restrictions.

  Further, the fan casing is larger than the axial flow fan, and as disclosed in Patent Document 2, there is a problem that an installation space required in the front-rear direction of the induction heating cooker increases.

  This invention solves the said malfunction, and provides the induction heating cooking appliance which has a small ventilation structure with especially small noise.

  Furthermore, this invention provides the induction heating cooking appliance which raised the arrangement | positioning freedom degree of electronic board components.

In order to solve the above-mentioned problems, the present invention is characterized in that a top plate for placing a container to be heated is arranged on the upper surface of the main body, and induction heating coils are arranged on the left and right below the top plate. The induction heating cooker in which the electronic board for driving the induction heating coil and the turbo fan for cooling the induction heating coil and the electronic board are arranged in the main body, wherein the turbo fan includes a suction port, an impeller, The cooling air, which is composed of an air outlet, a casing and a fan motor, deflects the direction of the flow of cooling air led to the suction port by 90 degrees in the impeller, and then deflects the direction of flow by 90 degrees in the casing. the supply cooling air from the air outlet, the fan with a turbofan, a part of the wind coming from the turbo fan is one of the left and right induction heating coil after cooling the electronic substrate Cooled, the other part of the wind coming from the turbo fan is to have so as to cool the other induction heating coil through the duct.

In addition to the above, the present invention is characterized in that a plurality of outlets are provided in the turbofan .

  Further, the present invention is characterized in that, in addition to the above, the duct is arranged downstream of some of the plurality of outlets.

  According to the present invention, there is an effect that cooling of the electronic substrate and cooling of the induction heating coil can be promoted.

  Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2 and subsequent figures, a part of the configuration common to the embodiment of FIG. 1 is omitted, and a redundant description is omitted. The same reference numerals in the drawings of the embodiments indicate the same or equivalent. Also, if there are two or more of the same thing and it is easier to understand by explaining them, add a suffix such as a or b to the sign of the number for parts that do not appear in the figure, otherwise The suffix is not added.

  In the present embodiment, an induction heating cooker including two induction heating units, one heater heating unit, and one roaster will be described as an example.

  First, the whole structure of the induction heating cooker of one Example of this invention is demonstrated. FIG. 1 is an external perspective view in which a pan of an induction heating cooker according to an embodiment of the present invention is placed, and shows a typical structure common to the induction heating cooker according to the present invention and a conventional induction heating cooker. FIG. FIG. 4 is a view showing a state where the top plate and the like are removed from the main body in the induction heating cooker according to the embodiment of the present invention. FIG. 5 is an exploded perspective view showing the mounting of the electronic board and the fan in the induction heating cooker according to the embodiment of the present invention. FIG. 6 is an internal side view of the induction heating cooker according to one embodiment of the present invention, cut at substantially the center of the right induction heating unit. FIG. 7 is an exploded perspective view of the induction heating cooker according to one embodiment of the present invention, cut at substantially the center in the height direction.

  In addition, FIG. 1 has shown the state which has mounted two pans on the top plate above the left and right induction heating parts. Moreover, the arrow in the figure represents the cooling air. The same applies hereinafter.

  1 and 4 to 7, reference numeral 1 denotes a top plate, which is provided on the upper surface of a later-described main body 6 and is made of glass, on which a load such as a later-described pan 15 (15a, 15b) is placed.

2 (2a, 2b) are two induction heating coils corresponding to the left and right induction heating units, which generate magnetic lines of force when a high-frequency current flows, and heat the pan 15 (15a, 15b) as a load. To do. The one corresponding to the right induction heating unit is 2a, and the one corresponding to the left induction heating unit is 2b.

  3 (3a, 3b) is a coil base, and there are two corresponding to the left and right induction heating parts, and the induction heating coil 2 (2a, 2b) is placed on the coil base, corresponding to the right induction heating part. What to do is 3a, and what corresponds to the left induction heating part is 3b.

  4 (4a, 4b) is a coil unit, corresponding to two induction heating units on the left and right sides, and is composed of an induction heating coil 2 (2a, 2b) and a coil base 3 (3a, 3b). Two are provided on the front left and right sides below 1 and 4a corresponds to the right induction heating unit, and 4b corresponds to the left induction heating unit.

  6 is a main body of the induction heating cooker. Reference numeral 7 denotes a fan, which is a turbo fan and is provided in the lower part inside the main body 6 and cools the induction heating coil 2 after cooling the electronic board 10 (10a, 10b, 10c) described later. The fan 7 includes an inlet 30, an impeller 31, an outlet 32 (32 a, 32 b, 32 c), a casing 33, and a fan motor 34.

  Reference numeral 9 denotes an air inlet, which is provided on the back side of the upper part of the main body 6 and is an inlet for cooling air inside the main body 6. The electronic substrate 10 is composed of a plurality of substrates, and is disposed below a plate that supports the coil unit 4 and the like, and controls the induction heating coil 2 and the like. Here, a case where three substrates are used is shown as a representative example, and the respective electronic substrates are denoted by 10a, 10b and 10c. An exhaust port 11 is provided on the back side of the upper portion of the main body 6 and is an outlet for cooling air inside the main body 6.

  15 (15a, 15b) is a pan, which is usually made of iron and is a container for foodstuffs. The one placed on the right induction heating unit is 15a, the one placed on the left induction heating coil is 15b. Reference numeral 16 denotes a power switch, which turns on / off the power supply of the entire device.

  Reference numerals 17a, 17b and 17c are output control knobs which are arranged on the front surface of the main body 6 and adjust the outputs corresponding to the right induction heating unit, the left induction heating unit and the radiant heater 21 described later. There are two display panels 18a and 18b corresponding to the right and left induction heating sections, which are arranged in front of the top surface of the top plate 1, and display the outputs of the right and left induction heating sections in liquid crystal, respectively. The strength of the heating output is transmitted to

  A roaster 19 is provided on the lower left side of the main body 6 and is a heater heating type used for cooking grilled fish. A top frame 20 fixes the top plate 1 to the main body 6. Reference numeral 21 denotes a radiant heater, which is a heater heating portion provided on the inner side of the main body 6 and used when cooking in a pan 15 or a container that cannot be heated by the induction heating method.

  A vent 22 is an opening provided in a plate that supports the coil units 4a, 4b and the like, and is provided in the vicinity of the coil units 4a, 4b. At least one vent 22 is provided near the lower portion of the right coil unit 4a as the right vent 22a. The left vent 22b is provided as necessary, and is provided below the left coil unit 4b or in the vicinity of the periphery in accordance with the arrangement of the roaster 19 (the left vent 22b may not be provided). is there.).

  Reference numeral 23 denotes a second vent hole, which is an opening provided in a plate that partitions the space where the coil units 4a, 4b and the like are arranged from the exhaust port 11. Reference numeral 24 denotes a roaster exhaust port, which is provided along with the exhaust port 11 and is an outlet for discharging oil smoke generated from the roaster 19.

  The overall operation of the above configuration will be described.

Place the pan 15a on the right induction heating section, that is, on the top plate 1 above the right induction heating coil 2a, turn on the power switch 16, and select the output adjustment knob 17a corresponding to the right induction heating section. Adjust to output.

Then, the electronic substrate 10 causes a high-frequency current to flow through the right induction heating coil 2a, generates magnetic lines of force from the induction heating coil 2a, and heats the pan 15a. At the same time, the electronic substrate 10 drives the fan 7.

  The driven fan 7 sucks outside air from the air inlet 9, blows cooling air on the electronic board 10, and cools it. The cooling air that has cooled the electronic substrate 10 is directed upward, passes through a vent 22 provided in a plate that supports the coil unit 4 and the like, and is blown into a space in which the coil unit 4 and the like are disposed. The unit 4a, that is, the induction heating coil 2a is sprayed to cool it, and then passes through the second vent 23 to the exhaust port 11 provided on the back side of the upper portion of the main body 6, and from the exhaust port 11 to the outside air Exhausted.

  Next, the detail of the Example of the ventilation structure of the fan 7 which concerns on this invention is demonstrated.

(First embodiment)
5, FIG. 6 and FIG. 7 are main part sectional views of the first embodiment of the air blowing structure of the present invention, showing a section in the vicinity of the fan 7 and the electronic substrate 10 (10a, 10b).

  The cooling air sucked from the air inlet 9 of the main body 6 is guided to the air inlet 30 of the fan 7 and given momentum by the impeller 31 having backward blades driven by the fan motor 34. After the direction of the flow of 90 degrees is deflected, the direction of the flow of 90 degrees is further deflected in the casing 33 and supplied to the electronic boards 10a and 10b from the blowout ports 32a and 32b. The impeller 31 is separated from the electronic substrate 10 side and the suction port 30 side by a casing 33. The direction of the suction inlet 30 and the blower outlets 32a and 32b is arrange | positioned in the direction which corresponds with the axial direction of the fan 7.

  With the above configuration, a uniform flow of the velocity distribution is supplied to the electronic board 10 from the fan 7 using a centrifugal fan that can obtain a high pressure by a centrifugal method. The influence of the obstruction directly below does not easily reach the impeller 31, and the blowing structure of the induction heating cooker can be realized with low noise.

  In addition, since there are a plurality of air outlets 32, components with a large amount of heat generated on the electronic substrate 10 can be distributed and arranged with respect to the air outlets 32a and 32b. In addition, the effect of increasing the degree of freedom of component placement can be obtained at the same time.

  Further, by arranging the direction of the suction port 30 of the fan 7 and the outlets 32 a and 32 b to coincide with the axial direction of the fan 7, the surface of the suction port 30 is made to be closer to that of the main body 6 than directly below the intake port 9 of the main body 6. It becomes easy to set it as the structure located in the near side.

  As a result, even if water intrudes from the air inlet 9 due to the pan 15 falling or the like, the risk of being sucked into the fan 7 can be extremely reduced. Furthermore, since the suction port 30 of the fan 7 is always higher than the bottom surface of the main body 6 due to the structure of the turbofan, the possibility that the fan 7 will secondarily suck the water accumulated on the bottom surface of the main body 6 should be extremely reduced. The effect that can be obtained.

(Second embodiment)
FIG. 8 is a perspective view of the main part of the second embodiment of the air blowing structure of the present invention.
The cross section of the vicinity of (10a, 10b) is shown.

  In this example, in the same configuration as that of the embodiment shown in the first example of the air blowing structure, as shown in FIG. 8, heat generation is large in the electronic board 10 downstream of the air outlets 32 a and 32 b of the fan 7. Electronic boards 10a and 10b on which components are mounted are concentratedly arranged. In this embodiment, the case where the electronic substrates 10a and 10b are arranged in a vertical shape so that the shape of the substrate can be easily matched with the shape of the air outlet 32 is shown. The electronic board 10c with a small calorific value is installed in a space between the electronic boards 10a and 10b.

  As a result, cooling of the heat-generating parts is promoted and stable cooking can be realized even when heating a non-magnetic stainless steel pan where heat generation is particularly large.

(Third embodiment)
FIG. 9 is a perspective view of an essential part of a third embodiment of the air blowing structure of the present invention.
The cross section of the vicinity of (10a, 10b) is shown.

In this example, in the same configuration as the embodiment shown in the first and second examples of the air blowing structure, as shown in FIG. 9, downstream of one air outlet 32 c in the air outlet 32 of the fan 7. In this configuration, a duct 35 is provided to guide the cooling air directly from the fan 7 to the induction heating coil 2.

  Thereby, the distribution of the cooling air is facilitated, and the cooling of the induction heating coil 2 is promoted even when the nonmagnetic stainless steel pan where the heat generation is large is heated, and the effect of realizing stable cooking can be obtained.

  In the above description, FIG. 9 shows an example in which the cooling air is guided only to the left induction heating coil 2b through the duct 35, but the present invention is not limited to the left induction heating coil 2b, and the duct 35 is disposed in the middle. The present invention can also be applied to an induction heating cooker that is configured to be branched and to supply cooling air to the right induction heating coil 2a at the same time.

(Fourth embodiment)
10, FIG. 11, FIG. 12, and FIG. 13 are cross-sectional views of the main part of the fourth embodiment of the air blowing structure of the present invention, showing the cross section in the vicinity of the fan 7 and the electronic board 10 (10a, 10b). is there.

  In the present embodiment, in the same configuration as the embodiment shown in the first, second, and third embodiments of the air blowing structure, as shown in FIGS. 10, 11, 12, and 13, the hub side of the impeller 31 is provided. The fan motor 34 is built in the boss part.

As a result, the hub side of the impeller 31 becomes larger by the amount of the fan motor, and the flow in the impeller 31 is somewhat affected, but the installation space for the fan motor 34 is significantly larger than in the first, second, and third embodiments. Therefore, the space in which the electronic substrate 10 can be installed is increased, and an effect of increasing the degree of freedom in arranging the electronic substrate 10 can be obtained.

  Moreover, the magnitude | size of the fan 7 whole can be reduced in size, and the mounting property to the induction heating cooking appliance main body 6 can be improved.

It is the external appearance perspective view which mounted the pan of the induction heating cooking appliance of one Example of this invention. It is the figure which showed the general characteristic of the axial flow fan. It is the schematic diagram which compared the multiblade fan and the turbo fan. It is a figure which shows the state which removed the top plate etc. from the main body in the induction heating cooking appliance of one Example of this invention. In the induction heating cooking appliance of the 1st example of the present invention, it is an exploded perspective view showing mounting of an electronic substrate and a fan. In the induction heating cooking appliance of the 1st example of the present invention, it is an internal side view cut by the approximate center of the right induction heating part. It is the disassembled perspective view cut | disconnected in the approximate center of the height direction in the induction heating cooking appliance of the 1st Example of this invention. It is a principal part perspective view of the 2nd Example of the ventilation structure of this invention, and shows the cross section of a fan and an electronic board vicinity. It is a principal part perspective view of the 3rd Example of the ventilation structure of this invention, and shows the cross section of a fan and an electronic board vicinity. In the induction heating cooking appliance of the 4th example of the present invention, it is an exploded perspective view showing mounting of an electronic substrate and a fan. In the induction heating cooking appliance of 4th Example of this invention, it is an internal side view cut | disconnected at the approximate center of the induction heating part of the right. It is the disassembled perspective view cut | disconnected in the approximate center of the height direction in the induction heating cooking appliance of the 4th Example of this invention. In the induction heating cooking appliance of the 4th example of the present invention, it is an exploded perspective view showing mounting of an electronic substrate and a fan.

Explanation of symbols

1 .. Top plate 2 (2a, 2b) .. Induction heating coil (right, left)
3 (3a, 3b) .. Coil base (right, left)
4 (4a, 4b) .. Coil unit (right, left)
6. Body 7 Fan Fan 9 (10a, 10b, 10c) Electronic board 11 Exhaust port 15 (15a, 15b) Pan (right, left)
16. Power switch 17 (17a, 17b, 17c) Output adjustment knob (right, left, radiant heater)
18 (18a, 18b) .. Display panel (right, left)
19. · Roaster 20 · · Top frame 21 · · Radiant heater 22 (22a, 22b) · · Vent (right, left)
23 .. Second ventilation port 24 .. Roaster exhaust port 30 .. Suction port 31 .. Impeller 32 (32a, 32b, 32c) .. Air outlet (right, left)
33 ·· Casing 34 · · Fan motor 35 · · Duct

Claims (3)

An electronic substrate for driving the induction heating coil having a top plate for placing the heated container on the upper surface of the main body, and having induction heating coils arranged on the left and right below the top plate, and the induction heating coil And an induction heating cooker in which the turbo fan for cooling the electronic board is arranged inside the main body,
The turbo fan is composed of a suction port, an impeller, a blowout port, a casing, and a fan motor, and the cooling air guided to the suction port is deflected in a direction of 90 degrees in the impeller, and then the casing The direction of the flow is further deflected by 90 degrees in the inside, and cooling air is supplied from the air outlet ,
A part of the wind coming out of the turbo fan cools the induction heating coil after cooling the electronic board, and another part of the wind coming out of the turbo fan is guided to the other through the duct. An induction heating cooker characterized in that the heating coil is cooled. In claim 1,
The said turbo fan has a several blower outlet, The induction heating cooking appliance characterized by the above-mentioned. In claim 2,
An induction heating cooker, wherein the duct is arranged downstream of some of the plurality of air outlets.

Images