JP5424812B2 - Electromagnetic induction heating cooker - Google Patents

Description

  The present invention relates to an electromagnetic induction heating cooker, and more particularly to an arrangement of a temperature sensor for measuring the temperature of a top plate.

  A conventional electromagnetic induction heating cooker includes an induction heating coil, a coil base on which the induction heating coil is placed, and a temperature sensor that is installed on the coil base and contacts the top plate. The cooling fan, the duct for passing the cooling air from the cooling fan to the induction heating coil, and the cooling air guided from the cooling fan to the duct are blown radially from the center of the coil to the upper surface of the induction heating coil. A ventilation path, a wall of the ventilation path provided in the windward side ventilation path of the temperature sensor and a hood with an integrated structure, blown out from the cooling fan, and the cooling wind guided to the duct is located in the central part of the coil base. The cooling air that flows to avoid the temperature sensor by the lower hood and flows to the central part of the induction heating coil through the ventilation hole in the central part of the coil base is the top. It has an induction heating coil flows radially ventilation path between the rate and the induction heating coil so as to intensively cool (see Patent Document 1).

Japanese Patent Laying-Open No. 2005-38653 (page 9, FIG. 8)

In a conventional electromagnetic induction heating cooker, the cooling air from the duct flows so as to avoid the temperature sensor by the lower hood in the central part of the coil base, and passes through the ventilation hole in the central part of the coil base. However, due to variations in parts such as the coil base and hood, and variations due to assembly of parts, cooling air hits the lower part of the temperature sensor installed on the coil base, and there may be errors in detection of the temperature sensor. When there is a temperature sensor, there is a problem that measurement variation of the temperature sensor occurs due to variation in contact of the temperature sensor with the top plate.
The present invention has been made to solve such a problem, and the influence of the cooling air that cools the heating coil on the temperature sensor can be reduced, the variation in contact of the temperature sensor with the top plate is small, and the temperature sensor is measured. The object is to obtain an electromagnetic induction heating cooker with little variation.

The electromagnetic induction heating cooker according to the present invention includes a top plate provided on an upper surface of a cooker body case, a heating coil provided in the cooker body case, and a heating coil provided in the cooker body case. A coil base on which the coil is placed, a temperature sensor that penetrates the coil base and measures the temperature of the top plate, a cooling fan provided in the cooker body case, and the cooker body case A cooling air passage for the coil that is formed and passes cooling air from the cooling fan toward the heating coil, and is provided so as to partition the cooling air passage for the coil and the coil base. A jet plate having a plurality of pores for blowing cooling air from the air passage to the heating coil, and a jet plate that projects from the surface without pores, and the lower end of the temperature sensor is inserted. Comprising a cylindrical receiving portion, and a biasing means for constantly urging to contact the upper surface of the temperature sensor is pressed against the back side of the top plate, the temperature sensor is held in a resin sensor holder, The lower end portion of the sensor holder is inserted into the receiving portion, and the urging means urges the sensor holder so that the upper surface of the temperature sensor is pressed against the back side of the top plate.

  In the electromagnetic induction heating cooker of the present invention, the top plate provided on the upper surface of the cooker body case, the heating coil in the cooker body case, the coil base on which the heating coil is placed, and the temperature of the top plate are measured. A temperature sensor, a cooling fan, a coil cooling air passage for passing cooling air from the cooling fan toward the heating coil, and a plurality of pores provided so as to partition the coil cooling air passage and the coil base Equipped with a jet plate, the lower end of the temperature sensor is inserted into a cylindrical receiving part that protrudes from the surface without pores with the jet plate, and the upper surface of the temperature sensor is pressed against the back side of the top plate by biasing means The cooling air from the cooling fan is blown out from the plurality of pores of the jet plate toward the heating coil through the coil cooling air passage to cool the heating coil. Since cooling air which is intercepted by the receiving unit does not come as a temperature sensor, it is possible to reduce the effect of cooling air on to the temperature sensor, there is an effect that the measurement variation in the temperature sensor is reduced.

In addition, since the lower end of the temperature sensor is inserted into the cylindrical receiving part of the fixed jet plate, there is less variation in contact with the top plate of the temperature sensor for each product, and measurement variation of the temperature sensor is reduced. There is an effect.
Furthermore, since the lower end of the temperature sensor is inserted into the cylindrical receiving part of the fixed jet plate, the lead wire of the temperature sensor can be routed by selecting the part without the pores of the jet plate. The lead wire of the temperature sensor does not interfere with the flow of cooling air that blows out from the pores of the plate toward the heating coil, and the lead wire can be connected before the heating coil is installed, so it is necessary to create an extra lead wire length. In addition, since there is no wire dust, the jet plate can be brought close to the heating coil, and the cooling performance of the cooling air blown out from the pores of the jet plate can be enhanced.

The perspective view of the state which looked at the electromagnetic induction heating cooking appliance of Embodiment 1 of this invention from the front. The longitudinal cross-sectional view which shows the same electromagnetic induction heating cooking appliance. The longitudinal cross-sectional view which shows the heating coil part of the electromagnetic induction heating cooking appliance. The longitudinal cross-sectional view which shows the state before the assembly of the coil base and jet plate of the electromagnetic induction heating cooking appliance. The longitudinal cross-sectional view which shows the heating coil part of the electromagnetic induction heating cooking appliance of Embodiment 2 of this invention. The top view which shows the back side of the coil base of the electromagnetic induction heating cooking appliance. The top view which shows the jet plate of the electromagnetic induction heating cooking appliance.

Embodiment 1 FIG.
FIG. 1 is a perspective view of the electromagnetic induction heating cooker according to Embodiment 1 of the present invention as viewed from the front.
As shown in FIG. 1, the electromagnetic induction heating cooker according to the first embodiment of the present invention is configured around a cooker main body case 1 having a substantially rectangular shape with an upper portion opened, and a top surface of the cooker main body case 1. A plate portion 2 is provided.
The top plate portion 2 includes a top plate frame 3 and a top plate 4 made of glass having high heat resistance and attached to the opening of the top plate frame 3.
On the upper surface of the top plate 4, circular guide marks 5M1 and 5M2 indicating the approximate positions of the left and right heating coils 7 and the central heating source (not shown) are displayed. P is a pan placed on the guide mark 5M1.

In the cooker main body case 1, there are provided doughnut-shaped heating coils 7 on the left and right sides that are induction heating sources, and a radiant heater (not shown) that is a rear central heating source that is heated by electric radiation heat.
A grill heating chamber 8 is provided on the front left side of the cooker body case 1. The front opening of the grill heating chamber 8 is covered with a grill door 9 so as to be freely opened and closed. The opening / closing operation of the grill door 9 can be performed by a handle 9a protruding forward.

As shown in FIG. 1, the operation means of the electromagnetic induction heating cooker includes a front operation unit 11 provided on the right front surface of the cooker body case 1 and an upper operation unit 15 provided on the front surface side of the top plate 4. It has become.
The front operation unit 11 includes a main power switch operation button 12 that can turn on / off all the power sources of the left and right heating coils 7 and the central heating source at once, energization of the right heating coil and the energization amount (thermal power). A right operation dial 13R for controlling the current, a left operation dial 13L for controlling the energization of the left heating coil and its energization amount (thermal power), a central operation dial 13C for controlling the energization of the central heating source and its energization amount (thermal power), etc. Is provided.

The upper surface operation unit 15 is provided with a right heating power setting operation unit, a left heating power setting operation unit, and a central operation unit that controls energization of the heater of the grill heating chamber 8.
Further, an integrated liquid crystal display unit 16 is provided on the front side in the front-rear direction at the center in the left-right direction of the top plate 4, and liquid crystal display units 17 </ b> L and 17 </ b> R are provided on the left and right of the integrated liquid crystal display unit 16.
The integrated liquid crystal display unit 16 displays energized states (thermal power, time, etc.) of the left and right heating coils, the central heating source, and the heater of the grill heating chamber 8, and the left and right liquid crystal display units 17L and 17R start timer cooking. The elapsed time from the time is displayed as a number.
Reference numerals 18L and 18R denote heating power display units for the left and right heating coils, and reference numeral 19 denotes a thermal power display unit for the central heating source.

As shown in FIG. 2, the cooker body case 1 is installed in the mounting hole 10 a of the kitchen cabinet 10. An intake duct 20 is provided at the rear part of the cooker body case 1, the intake side of the intake duct 20 communicates with an intake port 3 a formed at the rear part of the top plate frame 3, and the discharge side is a cooker body case. 1 is communicated with one end side of the air duct 21 provided in the central portion of the inside. A cooling fan 22 is arranged in the intake duct 20 near the discharge side.
In the air duct 21, two stages of circuit boards 24 on which electronic components 23 are mounted are installed in the vertical direction. The discharge side which is the other end side of the air duct 21 is opened toward the front in the cooker body case 1.

In the cooker main body case 1, a metal horizontal partition plate 25 is provided above the intake duct 20 and the air duct 21, and the coil cooling air passage communicates with the discharge side of the air duct 21 below the horizontal partition plate 25. 26 is formed.
An opening 25a is formed at a position below the heating coil 7 in the horizontal partition plate 25, and a metal jet plate 27 having a plurality of pores 27a is attached to the opening 25a. The jet plate 27 has a portion having a plurality of pores 27a projecting upward. The jet plate 27 may be made of synthetic resin.

As shown in FIGS. 2 to 4, each of the left and right heating coils 7 includes a donut-shaped inner heating coil 7 a and an outer heating coil 7 b. The heating coil 7 is installed on the coil base 30. The coil base 30 is fitted and supported by the protruding portion 28a of the coil base support member 28 attached to the horizontal partition plate 25 in the cooker body 1 on the back side of the top plate 4 with the cylindrical leg portion 30a. Yes. The coil base 30 has a central opening 30b in the central portion.
The coil spring 31 fitted to the outer periphery of the leg portion 30a of the coil base 30 has one end abutting on the coil base support member 28 and the other end abutting the lower surface of the coil base 30 to bring the coil base 30 upward. Always energized.

Between the inner heating coil 7a and the outer heating coil 7b of the heating coil 7 installed on the coil base 30, there is an opening 30c that penetrates the cylindrical synthetic resin sensor holder 33 holding the temperature sensor 32. Is provided.
Further, a cylindrical holder receiving portion 27b into which the lower end of the sensor holder 33 is inserted is provided at a position directly below the holder opening 30c of the coil base 30 in the jet plate 27. The holder receiving portion 27b has a wire drawing hole 27c for drawing out the lead wire 32a.
The sensor holder 33 has a spring receiving flange 33a on the outer periphery of the central portion. The lower end of the peripheral edge of the temperature sensor 32 is supported by the upper end which is one end of the sensor holder 33.
The flat upper surface of the temperature sensor 32 is pressed against the back surface of the top plate 4 by a coil spring 34 interposed between the spring receiving flange 33a of the sensor holder 33 and the upper end of the holder receiving portion 27b of the jet plate 27. It is in close contact.

  As in the first embodiment, the temperature sensor 32 is held in the holder opening 30c provided between the inner heating coil 7a and the outer heating coil 7b of the heating coil 7 installed on the coil base 30. A cylindrical resin sensor holder 33 is passed through, and the lower end of the sensor holder 33 is inserted into a holder receiving portion 27b projecting directly below the holder opening 30c of the coil base 30 in the jet plate 27. The temperature sensor 32 held by the sensor holder 33 is flattened by a coil spring 34 interposed between a spring receiving flange 33a provided on the outer periphery of the sensor holder 33 and the upper end of the holder receiving portion 27b of the jet plate 27. The upper surface is pressed against the back surface of the top plate 4 to be brought into close contact therewith, and the plurality of pores 27a of the jet plate 27 are formed as holder receiving portions 27b. Since the cooling fan 22 is provided at a position below the outer heating coil 7, the cooling air sucked into the intake duct 20 from the intake port 3 a by the cooling fan 22 passes through the air duct 21 and is mounted on the circuit board 24. 23 is cooled, reaches the jet plate 27 through the coil cooling air passage 26, and blows out from the air holes 27 a of the jet plate 27 toward the inner heating coil 7 a and the outer heating coil 7 b of the heating coil 7. Although the heating coil 7b is cooled, the lower end of the sensor holder 33 is covered with the holder receiving portion 27b of the jet plate 27, and the cooling air is blocked by the holder receiving portion 27b and does not directly hit the lower end of the sensor holder 33. Of the temperature sensor 32 held by the sensor holder 33 can be reduced, and the measurement of the temperature sensor 32 by the cooling air can be reduced. There is an effect that luck is reduced.

  In addition, since the sensor holder 33 that holds the temperature sensor 32 is inserted into the holder receiving portion 27b of the jet plate 27 to which the lower end is fixed, and the component accuracy of the jet plate 27 and the sensor holder 33 is high, Since the variation in the assembly of the temperature sensors 32 is small, the inclination of each temperature sensor 32 is small, and when two temperature sensors 32 are attached, the variation in contact of each temperature sensor 32 with the top plate 4 is small, and the measurement of the temperature sensor 32 is performed. Variations are reduced.

  Furthermore, since the lead wire 32a of the temperature sensor 32 can be routed by selecting a portion of the jet plate 27 that does not have pores, the pores 27a of the jet plate 27 are directed toward the inner heating coil 7a and the outer heating coil 7b of the heating coil 7. The lead wire 32a of the temperature sensor 32 does not interfere with the flow of the cooling air that is blown out, and the lead wire 32a of the temperature sensor 32 can be connected before the heating coil 7 is attached. Therefore, it is necessary to make an extra length of the lead wire 32a. In addition, since there is no wire dust, the jet plate 27 can be brought close to the heating coil 7, and the cooling performance of the cooling air blown from the pores 27a of the jet plate 27 can be improved.

  In the first embodiment, the holder receiving portion 27b of the jet plate 27 is inserted with the sensor holder 33 that holds the temperature sensor 32. The jet plate 27 may be made of metal or synthetic resin. However, the temperature sensor 32 may be directly inserted into the holder receiving portion 27b of the jet plate 27, and in that case, the jet flow is not applied to the temperature sensor 32 as much as possible. It is desirable to form the board 27 with a synthetic resin.

Embodiment 2. FIG.
FIG. 5 is a longitudinal sectional view showing the main part of the electromagnetic induction heating cooker according to Embodiment 2 of the present invention, FIG. 6 is a plan view showing the back side of the coil base of the electromagnetic induction heating cooker, and FIG. 7 is the electromagnetic induction. It is a top view which shows the jet plate of a heating cooker.
In the second embodiment, the same configurations as those of the first embodiment are denoted by the same reference numerals, and the description of the duplicate configurations is omitted, and a configuration different from the first embodiment will be described.
In the second embodiment, as shown in FIGS. 5 to 7, each holder receiving portion 27 b is provided on the surface of the jet plate 27 having no pores between the inner heating coil 7 a and the outer heating coil 7 b. A pair of lead wire guide walls 36 that are substantially Y-shaped when viewed from above, guide the lead wire 32a that extends in an arc shape from each position and avoids the air holes 27a in the middle and eventually reaches the outer periphery of the jet plate 27. A lead wire guide portion is formed on the groove protruding from the jet plate 27 and into which the lead wire 32a enters.

  In the second embodiment, the surface of the jet plate 27 without the corresponding pores 27a between the inner heating coil 7a and the outer heating coil 7b extends in an arc shape from the position where each holder receiving portion 27b is provided. A pair of substantially Y-shaped lead wire guide walls 36 projecting from the top to guide the lead wire reaching the outer periphery of the jet plate 27 by avoiding the air holes 32a from the middle, and on the groove into which the lead wire 32a enters. Therefore, even when two temperature sensors 32 are provided, it is only necessary to insert the lead wire 32a into the groove-like lead wire guide portion. Since the lead wire guide portion is provided in a place without the pores 27a, the lead wire 32a closes the pores 27a, etc., so that the lead wire 32a is connected. There is an effect that does not adversely affect the cooling to the heat coil 7.

  In both of the first and second embodiments, the heating coil 7 is composed of the inner heating coil 7a and the outer heating coil 7b, and the two temperature sensors 32 are provided between the inner heating coil 7a and the outer heating coil 7b. However, in the case of one heating coil 7, the temperature sensor 32 is positioned at the center of the heating coil 7, and a holder receiving portion 27 b for inserting a sensor holder 33 for holding the temperature sensor 32 is provided directly below the temperature sensor 32. Needless to say, the same effect as in the first embodiment may be obtained.

  DESCRIPTION OF SYMBOLS 1 Cooker main body case, 2 Top plate part, 3 Top plate frame, 4 Top plate, 7 Heating coil, 7a Inner heating coil, 7b Outer heating coil, 8 Grill heating chamber, 9 Grill door, 11 Front operation part, 15 Upper surface Operation part, 20 Intake duct, 21 Air duct, 22 Cooling fan, 23 Electronic component, 24 Circuit board, 25 Horizontal partition plate, 25a Opening part, 26 Coil cooling air path, 27 Jet plate, 27a Air hole, 27b Holder receiving part 28 Coil base support member 28a Protruding part 30 Coil base 30a Leg part 30b Center opening 30c Holder opening 31 Coil spring 32 Temperature sensor 32a Lead wire 33 Sensor holder 33a Spring receiving flange 34 Coil spring, 36 Lead wire guide wall.

Claims (3)

A top plate provided on the top surface of the cooker body case;
A heating coil provided in the cooker body case;
A coil base provided in the cooker body case, on which the heating coil is placed;
A temperature sensor that penetrates the coil base and measures the temperature of the top plate;
A cooling fan provided in the cooker body case;
A coil cooling air passage formed in the cooker main body case for passing cooling air from the cooling fan toward the heating coil;
A jet plate that is provided so as to partition between the coil cooling air passage and the coil base, and has a plurality of pores for blowing cooling air from the coil cooling air passage to the heating coil;
A cylindrical receiving portion that is projected on the surface without pores in the jet plate and into which the lower end of the temperature sensor is inserted;
An urging means for constantly urging the upper surface of the temperature sensor so as to press and adhere to the back side of the top plate;
Equipped with a,
The temperature sensor is held by a resin sensor holder, and a lower end portion of the sensor holder is inserted into the receiving portion, and the urging means presses the upper surface of the temperature sensor against the back side of the top plate so as to be in close contact with the receiving portion. An electromagnetic induction heating cooker characterized by energizing the sensor holder .   The electromagnetic induction heating cooker according to claim 1, wherein the jet plate is made of synthetic resin. A groove-like lead wire guide portion for guiding the lead wire of the temperature sensor from the receiving portion to the outer periphery of the jet plate and for receiving the lead wire is provided on the surface of the jet plate without pores. Item 3. The electromagnetic induction heating cooker according to item 1 or 2 .

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