JP6855935B2 - Cooker - Google Patents

Description

The present application relates to a cooking device for cooking an object to be cooked, and particularly in a cooking device for heating a cooking container by an electromagnetic induction method, a cooking device generated from a power supply circuit for applying a high frequency voltage to an induction heating coil or the like. It relates to a cooking cooker that effectively reduces the leakage noise that propagates from the power cord to the outside.

In recent years, a rice cooker as a cooking cooker controls a heating means by a microcomputer based on the temperature of the inner pot detected by a temperature sensor arranged around the inner pot, and performs a water absorption process, a temperature raising process, and cooking. By finely adjusting the temperature of the inner pot in each of the rice cooking processes such as the process (boiling process), additional cooking process, and murashi process, it is not affected by changes in the amount of rice cooked or the environmental temperature, and also according to the user's preference. You can cook delicious rice.

As a method of heating the inner pot that houses the rice cooked food stored inside the rice cooker body, in addition to the heater heating method that transmits the heat generated by the electric heater to the inner pot via the heating plate, around the inner pot. An electromagnetic induction method (IH method) is adopted in which a work coil, which is an induction heating coil arranged in, is energized to generate a magnetic field, and the inner pot is heated by the resistance of an eddy current generated by the generated magnetic field. Since the inner pot itself generates heat directly, the electromagnetic induction type rice cooker can heat the entire inner pot evenly, and uses high heat to bring the rice and water inside the inner pot to a boiling state in a short time. Therefore, it is possible to shorten the time required for the temperature raising step in the rice cooking process to prevent the α-decorn on the surface of the rice from collapsing, and it is possible to cook shiny and delicious rice.

In such an electromagnetic induction type rice cooker, the noise generated from the power supply circuit that applies a high voltage to the work coil at a high frequency and the noise induced in the power supply lead inside the rice cooker due to the magnetic field generated from the work coil are the power supply of the rice cooker. It is necessary to reduce the noise terminal voltage that travels through the cord and leaks to the outside.

Conventionally, as a technology to reduce the noise terminal voltage from an electromagnetic induction type rice cooker, a power supply lead that connects a power supply cord and a power supply circuit that generates a high frequency voltage in the rice cooker is attached to the outer part of the rice cooker housing. It has been proposed that the power supply noise from the mounting surface of the work coil or rice cooker is less likely to be transmitted to the power supply lead by arranging it in the central portion in the gap between the work coil and the rice cooker (see Patent Document 1). Further, on the bottom surface of the inner pot accommodating portion in which the inner pot is accommodated, a holding member of a work coil arranged so as to face the inner pot is formed to extend upward along the side surface of the inner pot, and this holding member is formed. By supporting the power supply lead that connects the power cord and the power supply circuit to the upper end of the rice cooker, the distance between the work coil and the power supply lead is secured, and the noise terminal voltage without increasing the height or planar shape of the rice cooker. (See Patent Document 2).

Japanese Unexamined Patent Publication No. 2002-345638 Japanese Unexamined Patent Publication No. 2015-139516

In the above-mentioned conventional rice cooker, the work coil, which is a source of noise, is induced by the magnetic field of the work coil by the power supply lead by ensuring a distance between the work coil and the power supply lead connecting the work coil and the power cord. It reduces high-frequency noise components and reduces leakage noise from the power cord.

However, even if such measures were taken, the noise terminal voltage that leaked to the outside through the power cord remained and could not be sufficiently reduced.

The present application solves a problem common to cooking cookers that heat an object to be cooked by an induction heating method such as a conventional rice cooker, and is effective in transmitting high-frequency noise to a power cord. The purpose is to obtain a cooking cooker that can prevent noise terminals and reduce noise terminal voltage with a simple configuration.

In order to solve the above problems, the heating cooker disclosed in the present application includes a cooking container for storing an object to be cooked and a cooker main body for accommodating or placing the cooking container, and the cooking is carried out in the cooker main body. An inductive heating coil for heating the container, a power supply circuit for supplying electric power to the inductive heating coil, a filter circuit for reducing noise from the power supply circuit, and a power supply cord connected to a commercial power supply are arranged, and the cooking is performed. The power supply circuit and the connection terminal between the power supply circuit and the induction heating coil are arranged with respect to the left-right center line of the cooker body in the direction in which the power supply cord is pulled out from the container body to the outside. The feature is that it is set in a direction different from that of the side.

The heating cooker disclosed in the present application includes a power supply circuit that supplies electric power to an inductive heating coil with respect to the center line in the left-right direction of the cooker body in a pull-out direction of a power cord connected to a commercial power supply, and a power supply circuit and an inductive. It is set in a direction different from the side where the connection terminal for connecting the heating coil is arranged. Therefore, a distance between the power supply circuit and the power cord can be secured, noise can be effectively prevented from being transmitted to the power cord, and the noise terminal voltage can be reduced.

It is a perspective view which shows the appearance of the rice cooker which concerns on embodiment. It is a perspective view which shows the state which the lid body of the rice cooker which concerns on embodiment is open. It is a block diagram explaining the basic structure of the rice cooker which concerns on embodiment. It is a circuit diagram explaining the structure of the power supply circuit of the rice cooker which concerns on embodiment. It is a bottom view which shows the internal structure of a rice cooker main body. It is an image diagram explaining the propagation of noise in a power line. It is a figure which shows the measurement result of the noise terminal voltage characteristic in the rice cooker which concerns on embodiment. It is a figure which shows the measurement result of the noise terminal voltage characteristic in the rice cooker of the comparative example. It is a figure which shows the measurement result of the noise terminal voltage characteristic in the rice cooker of the 2nd comparative example.

The heating cooker disclosed in the present application includes a cooking container for storing an object to be cooked and a cooker main body for accommodating or placing the cooking container, and an induction heating coil for heating the cooking container in the cooker main body. A power supply circuit that supplies electric power to the induction heating coil, a filter circuit that reduces noise from the power supply circuit, and a power cord connected to a commercial power supply are arranged, and the cooker main body is directed to the outside. The pull-out direction of the power cord is set in a direction different from the side where the power supply circuit and the connection terminal between the power supply circuit and the induction heating coil are arranged with respect to the center line in the left-right direction of the cooker body. Has been done.

The heating cooker disclosed in the present application has a power supply circuit that supplies electric power to the induction heating coil, an arrangement position of a connection terminal that connects the power supply circuit and the induction heating coil, and the outside of a power cord connected to a commercial power source. Is set to be on a different side from the center line in the left-right direction of the cooker body. Therefore, it is possible to reduce the noise component that propagates in the air from the power supply circuit and the connection terminal, which are noise sources, and is excited by the power cord, effectively reducing the noise terminal voltage that leaks from the power cord to the outside. can do.

The cooker disclosed in the present application includes an inner pot as the cooking container for storing the rice to be cooked, a rice cooker main body which is the cooker main body having an inner pot accommodating portion for accommodating the inner pot so as to be removable, and the above. It can be configured to include a lid that can open and close the inner pot accommodating portion. By doing so, it is possible to obtain a rice cooker in which the noise terminal voltage is effectively reduced.

In the heating cooker, the filter circuit is located on the side where the power supply circuit and the connection terminal between the power supply circuit and the induction heating coil are arranged with respect to the center line in the left-right direction of the cooker body. It is preferably located on different sides. By doing so, the distance between the power supply circuit, which is a noise source, and the connection terminal can be secured, and the propagation of noise to the filter circuit can be reduced.

Further, it is preferable that the position of pulling out the power cord from the cooker rice cooker main body is set to a position lower than the lower limit position of the circuit board on which the filter circuit is mounted. By doing so, the distance between the filter circuit and the pulled-out power cord can be secured, and the propagation of high-frequency noise can be effectively reduced.

Further, the cooking cooker disclosed in the present application can be provided with a cord reel for winding the excess portion of the power cord.

Hereinafter, as an embodiment of the heating cooker disclosed in the present application, it is an induction heating type rice cooker that heats the inner pot with an eddy current generated by an induction heating coil, and the pressure inside the inner pot is adjusted by a pressure valve. An example of a rice cooker that cooks rice will be described. The rice cooker illustrated in this embodiment is a rice cooker provided with an inner pot provided with a non-metal coating layer capable of improving heat storage and cooking delicious rice.

(Embodiment)
FIG. 1 is a perspective view showing the appearance of a rice cooker, which is a cooking cooker according to the present embodiment, and is a perspective view in a state where the lid is closed. Further, FIG. 2 is a perspective view showing a state in which the lid is opened in the rice cooker according to the present embodiment.

As shown in FIGS. 1 and 2, the rice cooker of the present embodiment includes rice and water, and in the rice cooking mode with ingredients, various ingredients such as vegetables, beans, and meat (cooked food). The inner pot 30 as a cooking container for putting the rice cooker, the rice cooker main body 20 which is a cooking container main body capable of accommodating the inner pot 30 in the inner pot accommodating portion 20a, and the upper part of the inner pot accommodating portion 20a of the rice cooker main body 20. It has a lid 10 that covers the rice cooker so as to be openable and closable.

A steam cap 11 having a steam discharge port 11a, which is located at the upper end of a pressure adjusting mechanism for adjusting the pressure inside the rice cooker, is arranged on the rear side of the lid 10, that is, on the upper right side in FIG. Has been done.

In the rice cooker according to the present embodiment, an operation unit 12 for the user to operate the rice cooker is arranged at a portion located on the front side of the lid 10 when the lid 10 is closed. The operation unit 12 includes a plurality of operation buttons 12a for selecting various functions such as power ON / OFF of the rice cooker, timer rice cooking and heat retention, and a plurality of selection buttons 12b for selecting a rice cooking program and setting hours and minutes. It is composed of a display panel 12c that displays the operation content and the state of the rice cooker. Further, on the front side of the operation unit 12, a lock button 13 for unlocking the lid 10 is arranged. The lid 10 is urged by a spring coil provided in a hinge mechanism that rotatably fixes the lid 10 to the rice cooker body 20, and opens rearward when the user presses the lock button 13. The state shown in FIG. 2 is obtained.

As shown in FIG. 2, the inner pot accommodating portion 20a of the rice cooker main body 20 has a bottomed tubular shape having a size that allows the inner pot 30 to fit inside the inner pot accommodating portion 20a.

In the rice cooker of the present embodiment, an annular first work coil, which is a first induction heating coil, is also provided on the back side portion of the bottom surface of the inner pot accommodating portion 20a configured as a resin frame. A hollow cylindrical second work coil, which is a second induction heating coil, is arranged outside the side surface portion of the accommodating portion 20a. A magnetic field component is generated by applying a high-frequency voltage to the first work coil and the second work coil, and the bottom surface portion and the side surface of the inner pot 30 facing each other via the frame of the inner pot accommodating portion 20a, respectively. An eddy current is generated in the part and the resistance heats the inner pot. In FIG. 2, the first work coil and the second work coil are not shown in order to avoid complicating the drawings.

A center sensor (not shown) is arranged in the center of the bottom surface of the inner pot accommodating portion 20a. The center sensor is urged upward from the bottom of the rice cooker main body 20 by using an elastic means such as a spring, and when the inner pot 30 is housed in the inner pot accommodating portion 20a, the inner pot 30 The temperature of the inner pot 30 can be accurately detected by contacting the central portion of the bottom surface. The center sensor can be composed of a general temperature detection member including a thermoelectric element such as a thermocouple or a thermistor in which a temperature detection surface is arranged on the upper surface.

As shown in FIG. 2, an inner lid 14 that covers an opening portion on the upper surface of the inner pot 30 when the lid 10 is closed is arranged on the inner surface of the lid 10, and a part of the inner lid 14 is adjusted. A pressure adjusting mechanism 15 having a pressure hole 15a and a negative pressure packing 15b is arranged. In the rice cooker of the present embodiment, in the rice cooking process executed at a high temperature during the rice cooking program such as the temperature raising step and the cooking step, the pressure in the inner pot 30 is set to 1 atm or more and the boiling temperature of the cooked rice is 100 degrees. The above-mentioned pressurized rice cooking is performed, and the water can be evaporated firmly to cook the rice more deliciously.

FIG. 3 is a block diagram showing a basic configuration of the rice cooker according to the present embodiment.

It should be noted that each block shown in FIG. 3 shows each component involved in the operation of the rice cooker according to the present embodiment separately in terms of its function, and is an actual component arranged inside the rice cooker. It is different from the distinction of. Therefore, in FIG. 3, what is shown as one block may be composed of a plurality of components, or conversely, circuit components that perform the functions of the plurality of blocks may be mounted on one board. is there.

As shown in FIG. 3, in the rice cooker according to the present embodiment, the control circuit 51 receives information from the center sensor 21 that detects the temperature of the inner pot 30 in which the cooked rice 31 is housed, and the control circuit 51 sets the inner pot 30. The rice cooking program is executed by controlling the operation of the power supply circuit 43 that supplies power to the induction heating coil that heats the rice cooker, and the pressure regulating mechanism 15 that controls the pressure regulating valve arranged on the lid 10 that covers the upper part of the inner pot 30. To do.

The control circuit 51 includes an input / output unit 52 that receives an operation from the user and operates the operation buttons 12a and 12b of the operation unit 12 that notifies the user of the operating status of the rice cooker, the display panel 12c, and the like, and the rice cooking process. A timer unit 53 for counting the elapsed time in the above, a storage unit 54 for storing the rice cooking program and the display contents on the display panel 12c of the input / output unit 52, and the like are connected to contribute to the execution of the rice cooking program by the control circuit 51. There is.

In the rice cooker according to the present embodiment, as the induction heating coil for heating the inner pot 30 as described above, the annular first work coil 41 arranged to face the bottom surface of the inner pot 30 and the inner pot 30 A second work coil 42 is provided so as to face the lower portion of the side surface and surround the inner pot 30. These two work coils 41 and 42 are connected to the power supply circuit 43 by a pair of connection terminals 44a and 44b, respectively. In the following description, the power supply circuit 43 and the connection terminals 44a and 44b connecting the power supply circuit 43 and the work coils 41 and 42 may be collectively referred to as a power supply circuit unit 45. In the work coils 41 and 42, an induced magnetic field is generated by a high frequency voltage supplied from the power supply circuit 43, and the inner pot 30 is heated by the eddy current generated in the inner pot 30 by the induced magnetic field.

FIG. 4 shows a circuit configuration diagram of the power supply circuit.

The power supply circuit 43 of the rice cooker of the present embodiment can be configured as a general high-voltage switching circuit (inverter circuit) as shown in FIG. 4, and is connected to an AC voltage from an AC power supply 61 which is a commercial power supply. A parallel body of work coils 41 and 42 and a resonance capacitor 65 and a switching element 66 composed of an IGBT or MOSFET are connected in series to the output of a rectifier circuit composed of a diode bridge 62, a choke coil 63, and a smoothing capacitor 64. Has been done.

The control circuit 51 that controls the switching element 66 converts the AC voltage obtained from the commercial power supply 61 into a predetermined DC voltage (5 V as an example) to serve as an operating power supply. The voltage value applied to the work coils 41 and 42 and the application timing change according to the control signal applied from the control circuit 51 to the terminal of the switching element 66, and applied from the work coils 41 and 42 to the inner pot 30. The amount of heating to be done changes.

In such a power supply circuit 43, since the switching element 66 is switched on / off at a high frequency, the switching element 66 itself becomes a noise source of high frequency power supply noise. Further, since the connection terminals 44 of the induction heating coils 41 and 42 connected in series with the switching element 66 receive a high frequency voltage between both terminals, they can be used as a noise source of high frequency power supply noise like the switching element 66. Become.

As shown in FIG. 3, in the rice cooker according to the present embodiment, a filter circuit 46 for canceling noise propagating through the power supply line is arranged between the power supply circuit 43 and the power cord 47, which are noise sources. There is. The filter circuit 46 can be configured as an electric circuit corresponding to the frequency component of the noise to be removed by using a capacitor, a choke coil, or the like that removes the noise of the high frequency component. Further, as the noise to be removed, a configuration for removing either one or both of the common mode noise and the normal mode noise can be appropriately selected.

FIG. 5 is a bottom view showing the internal configuration of the bottom surface portion of the rice cooker main body of the rice cooker according to the present embodiment.

FIG. 5 shows a state in which the resin housing constituting the outer shell of the rice cooker main body 20 is removed and viewed from the bottom surface side of the rice cooker main body 20.

In FIG. 5, the alternate long and short dash line 70 is the center line in the left-right direction of the rice cooker main body 20, that is, as shown in FIG. 1 or 2, the rice cooker in a normal operating state with the operation unit 12 on the front side. It passes through the center in the left-right direction and shows a line connecting the front and back of the rice cooker. In the rice cooker of the present embodiment, the center line 70 in the left-right direction of the rice cooker main body 20 supports the center sensor 21 arranged at the center of the inner pot accommodating portion 20a so as to abut the center of the bottom surface of the inner pot 30. It passes through the central portion of the center sensor substrate 75.

Since the vertical direction of FIG. 5 is reversed from that of FIGS. 1 and 2 showing the normal usage state, the side indicated by the arrow 71 in FIG. 5 is the right side of the horizontal center line 70 in the rice cooker. Similarly, the side indicated by the arrow 72 in FIG. 5 is the left side of the center line 70 in the left-right direction in the rice cooker. In explaining the left-right direction in the following description, the left-right direction in the normal use state of the rice cooker is used, and the arrow 71 side is referred to as the right side and the arrow 72 side is referred to as the left side. In FIG. 5, the upper side of FIG. 5 is the rear (back) side of the rice cooker main body 20, and the lower side of FIG. 5 is the front (front) side of the rice cooker main body 20.

As shown in FIG. 5, in the rice cooker according to the present embodiment, the power supply circuit 43 and the connection terminal 44a of the first work coil 41 are arranged on the rear side portion on the right side (arrow 71 direction) of the center line 70 in the left-right direction. Has been done. Although the second work coil 42 is not visible in FIG. 5, the connection terminal 44b of the second work coil 42 is also arranged on the rear side portion on the right side (arrow 71 direction) of the center line 70 in the left-right direction. That is, in the rice cooker according to the present embodiment, the power supply circuit unit 45 including the power supply circuit 43 and the connection terminal 44 is arranged on the right side (arrow 71 direction) of the center line 70 in the left-right direction of the rice cooker main body 20.

On the other hand, in the rice cooker according to the present embodiment, the filter circuit 46 is arranged at the rear portion on the left side (direction of the arrow 72) with respect to the center line 70 in the left-right direction of the rice cooker main body 20. The power supply circuit unit 45 and the filter circuit 46 are arranged at positions that are substantially symmetrical in the left-right direction via a cooling fan 74 arranged on the rear side of the central portion in the left-right direction in the rice cooker main body. .. By doing so, the power supply circuit unit 45 and the filter circuit 46 are placed between the inner pot accommodating portion 20a located in the central portion of the rice cooker main body 20 and the outer shell of the rice cooker main body 20 having a substantially rectangular shape in a plan view. It can be arranged in the gap portion in a state where the distance between them is larger, and the interference of leaked radio waves from the power supply circuit unit 45 to the filter circuit 46 can be minimized.

On the rear side of the cooling fan 74, a cord reel 73 for winding the excess portion of the power cord 47 is arranged. In the rice cooker of the present embodiment, the cord reel 73 is arranged at the rear end portion of the rice cooker main body 20 so that the winding surface thereof is in the vertical direction. By arranging the cord reel 73 so that the winding surface is in the vertical direction in this way, the cord is formed even in a portion where the distance between the inner pot accommodating portion 20a having a substantially cylindrical shape and the outer shell of the rice cooker main body 20 is narrow. The reel 73 can be arranged, and the area expansion when the rice cooker main body 20 is viewed in a plan view can be prevented.

In the rice cooker according to the present embodiment, the power cord 47 wound around the cord reel 73 is arranged so that the plug 48 at the tip thereof faces the left side (arrow 72) of the rice cooker main body 20. Therefore, the pull-out direction of the power cord 47 is such that the side where the power circuit 43 and the connection terminal 44 for the work coil 41 are arranged (arrow 71 side) is the center line 70 in the left-right direction of the rice cooker main body 20. On the other hand, it is on the other side. By doing so, in the rice cooker according to the present embodiment, the noise terminal voltage propagating to the outside through the power cord 47 can be reduced.

FIG. 6 is an image diagram for explaining the propagation state of noise propagating through the power supply line and leaking to the outside in the rice cooker according to the present embodiment.

In FIG. 6, the power supply line in the rice cooker body from the power cord to the work coil is shown by a thick white line, and noise propagating along this power supply line and being induced in a lead wire or the like through the air. This is an explanation of the flow of propagating noise. Note that, in FIG. 6, the relative arrangement of each component such as the power supply circuit, work coil, filter circuit, cord reel, and power cord is arranged in the bottom view of the rice cooker according to the present embodiment shown in FIG. It is described so as to be the same as.

As described above, in an induction heating type rice cooker in which a high frequency voltage is applied to a work coil which is an induction heating coil and the inner pot is heated by an eddy current generated on the surface of the inner pot by an induced magnetic field generated from the work coil, the IGBT in the power supply circuit is used. The switching element such as the above and the work coil serve as a noise source 81 for high-frequency noise.

As shown in FIG. 6, the high-frequency noise generated in the work coil and the switching element, which are the noise sources 81, is transmitted through the power supply circuit via the wiring of the electric circuit and other electric elements (arrow 86a in the figure), and further, the rice is cooked. It propagates to the filter circuit via the power supply lead used for power supply in the main body of the device (arrow 86b in the figure). Since this noise propagation is direct propagation that follows the power supply line in the opposite direction, the power supply circuit and power supply lead are considered to be the first noise propagation section 82, and the filter circuit is considered to be the second noise propagation section 83. be able to.

Since the filter circuit is configured to remove high-frequency noise, the noise flow (arrows 86a, 86b) that follows the power supply line stops at the filter circuit and is basically not transmitted to the power cord beyond it. Can be considered.

On the other hand, radiation noise (arrow 87 in the figure) originating from a connection terminal or the like propagates from the switching element or work coil which is the noise source 81. Since the noise is excited by the radiated noise 86, the cord reel can be grasped as the first receiving unit 84, and the power cord pulled out from the cord reel can be grasped as the second receiving unit 85.

The degree of propagation of the radiated noise 87 decreases as the physical distance from the power supply circuit or the connection terminal, which is the noise source 81, increases. In the rice cooker according to the present embodiment, since the power cord is pulled out in the direction opposite to the power supply circuit portion inside the rice cooker body, noise from the power supply circuit or connection terminal, which is a noise source 81, to the power cord. Propagation 87b can be reduced. Further, by setting the pull-out direction of the power cord to the right side in FIG. 6, the position of the cord reel for accommodating the surplus portion of the power cord is also on the right in FIG. 6 as compared with the case where the pull-out direction of the power cord is on the left side. It can be positioned in the direction, and the propagation of noise 87a from the noise source 81 to the cord reel can be suppressed to a small value.

In addition to the switching element and the connection terminal that are the noise source 81, the noise propagating in the air includes each terminal portion of the power supply circuit in the transmission unit 82 and other electric circuits connected to the power supply circuit via the power supply lead. It is also emitted from the terminal portion of the filter circuit (87c, 87d, 87e). However, the radiated noise (87c, 87d, 87e) from the transmission unit 82 is weaker than the radiated noise (87a, 87b) from the noise source 81. Therefore, even if the distance from the power cord of the receiving unit 85 is short, the noise excited by the power coil is small.

As shown in FIG. 5, in the rice cooker of the present embodiment, the filter circuit 46 is arranged on the same side as the power cord withdrawal direction (arrow 72 side), and the cord reel 73 for withdrawing the power cord and the filter. Since the circuit 46 is arranged between the inner pot accommodating portion 20a in the rear portion of the rice cooker main body 20 and the housing, the distance between the filter circuit 46 and the pulled out power cord 47 is basically shortened. In the rice cooker of the present embodiment, the power cord 47 is pulled out below the lower limit of the circuit board on which the filter circuit 46 is mounted so that the power cord 47 is as far away from the filter circuit 46 as possible to filter. The radiation noise 87e from the circuit board on which the circuit 46 is mounted is suppressed from propagating to the power cord 47 as much as possible.

As described above, in the rice cooker according to the present embodiment, by arranging the filter circuit 46 that removes the power supply noise between the power supply circuit 43 and the power cord 47, the power cord is transmitted from the noise source 81 via the power supply line. While removing the noise propagating to 47, the pull-out direction of the power cord 47 is different from the direction in which the power circuit unit 45, which is the noise source 81, is arranged with respect to the left-right center line 70 of the rice cooker main body 20. By setting to, the propagation of radiated noise from the noise source 81 to the power cord 47 is suppressed, and the noise propagating from the power cord 47 to the outside is reduced.

7 to 9 are graphs showing the measurement results of the noise terminal voltage in the rice cooker of the present embodiment and the rice cookers of the two comparative examples.

FIG. 7 is a characteristic diagram of the terminal noise voltage in the rice cooker according to the present embodiment, which shows the arrangement position inside the rice cooker main body in FIG. On the other hand, FIG. 8 is a characteristic diagram of the noise terminal voltage in the rice cooker as the first comparative example, in which the arrangement direction of the cord reel 73 is reversed from that of the rice cooker of the present embodiment, and the power supply circuit 43 It shows the characteristics of a rice cooker set so that the power cord 47 is pulled out in the same right direction (direction of arrow 71) as the direction in which the connection terminal 43 is arranged. FIG. 9 is a characteristic diagram of the noise terminal voltage in the rice cooker of still another second comparative example, and the pull-out direction of the power cord 47 is set in the same manner as that of the rice cooker of the first comparative example, and the power supply circuit 43 and The result of the characteristic measurement when the aluminum sheet is arranged between the power cord 47 and the power cord 47 is shielded is shown.

The noise terminal voltage of FIGS. 7 to 9 is based on EN61000-6-4 of the noise regulation standard CISPR (Comite International Special des Perturbations Radioelectriques) of IEC (International Electrotechnical Commission), and the LISN (Line Impewdance Stabilization Network: power supply). It was measured using an impedance stabilization network).

The noise terminal voltage from the rice cooker of the present embodiment shown in FIG. 7 is below the permissible value of CISPR shown by the dotted line in the figure in all frequency bands from 0.01 MHz to 30 MHz. In particular, it can be seen that the noise level of the rice cooker of Comparative Example 1 shown in FIG. 8 is lower by 10 dB or more in the frequency band of 0.5 MHz to 30 MHz.

On the other hand, the rice cooker of Comparative Example 1 does not satisfy the permissible value of 56 dB (μV) of the quasi-peak value in the frequency band of 0.5 MHz to 30 MHz. On the other hand, the rice cooker of the second comparative example also satisfies the permissible value of CISPR, but the rice cooker of the present embodiment does not have a shield member like the rice cooker of the second comparative example. The noise terminal voltage characteristics equivalent to those of the rice cooker in the second comparative example can be realized only by setting the pull-out direction of the power cord, and it is possible to realize a rice cooker with less leakage noise at a lower cost. Understand.

As described above, in the rice cooker of the present embodiment, it is possible to reduce the leakage noise propagating from the power cord to the outside without using an additional member only by defining the pull-out direction of the power cord.

In the above embodiment, an induction heating coil for heating the inner pot is illustrated with two work coils, but the rice cooker according to the present application includes one or three induction heating coils. Needless to say, we can prepare for the above.

Further, in the above embodiment, a rice cooker having a pressure adjusting mechanism for controlling the pressure in the space inside the inner pot and performing pressure cooking is illustrated, but it is essential to perform pressure cooking in the rice cooker disclosed in the present application. is not it. Similarly, in the above embodiment, a rice cooker provided with an inner pot provided with a non-metal coating layer has been exemplified, but as the material of the inner pot, a metal inner pot made of stainless steel, a dynamic pot, or a so-called clay pot is used. It can be realized as a rice cooker equipped with a type non-metal inner pot.

In addition, the shape and design of the rice cooker, such as the shape of the lid of the rice cooker and the arrangement position of the operation unit, can be freely designed.

In the above embodiment, a rice cooker provided with a cord reel for winding the excess portion of the power cord is illustrated, but the power cord connected to the power supply circuit is moved outward from the rice cooker body without using the cord reel. It can be a rice cooker that extends. In this case, the direction in which the power cord is pulled out from the rice cooker main body means the extending direction of the inlet of the power cord formed in the rice cooker main body.

The cooking cooker disclosed in the present application has been described by exemplifying a rice cooker. However, the noise terminal disclosed in the present application in which high-frequency noise from a power supply circuit for supplying electric power to an inductive heating coil is transmitted through a power supply cord and leaks. A configuration that can reduce the electric power can be similarly adopted for all cooking cookers that cook by heating a cooking container containing an object to be cooked with an induction heating coil, such as a home bakery and a food processor, and can achieve the same effect.

In the case of an induction heating type cooker other than the rice cooker, various forms different from the rice cooker can be assumed in the configuration as the cooker. For example, it is conceivable that a cooking container containing an object to be cooked is not taken out from the main body of the cooker, but a cooking container in which the cooking container is fixed in the main body of the cooker. Further, the cooking container is placed on the cooking container body, and the food to be cooked in the cooking container is heated by using the induction heating coil arranged in the cooking container body so as to face the bottom surface of the cooking container. Can be assumed. Further, even in the case of the configuration in which the cooking container is detachably housed inside the cooking container body, the container taking-out port formed on the side surface of the cooking device body is not a structure provided with a lid covering the upper part of the cooking container. The cooking container can be taken out and stored in a substantially horizontal direction.

The cooking cooker disclosed in the present application is useful as various cooking cookers including a rice cooker that has a simple structure and reduces noise leakage from the power cord to the outside.

10 Lid 20 Cooker body (rice cooker body)
20a Inner pot housing 30 Cooking container (inner pot)
41, 42 Induction heating coil 43 Power supply circuit 46 Filter circuit 47 Power cord 70 Left-right center line

Claims (4)

A cooking container to put the food to be cooked and
It is provided with a cooker body for accommodating or placing the cooking container.
Inside the cooker body, an induction heating coil for heating the cooking container, a power supply circuit for supplying electric power to the induction heating coil, a filter circuit for reducing noise from the power supply circuit, and a commercial power supply are connected. Power cord and is placed,
The power supply circuit, the power supply circuit, and the connection terminal between the power supply circuit and the induction heating coil are arranged with respect to the horizontal center line of the cooker body in the direction in which the power cord is pulled out from the cooker body to the outside. the by which side is set in different directions,
The filter circuit is arranged on a side different from the side where the power supply circuit and the connection terminal between the power supply circuit and the induction heating coil are arranged with respect to the left-right center line of the cooker main body. A heating cooker characterized by being present. The inner pot as the cooking container for the rice to be cooked,
A rice cooker main body, which is a cooker main body having an inner pot accommodating portion for accommodating the inner pot so as to be removable,
The cooker according to claim 1, further comprising a lid that can open and close the inner pot accommodating portion. The pull-out position of the power cord from the cooker body, wherein the filter circuit is set at a position lower than the lower limit position of the mounted circuit board, heating cooker according to claim 1 or 2. The cooker according to any one of claims 1 to 3 , further comprising a cord reel for winding the excess portion of the power cord.

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