JP2530957Y2 - Induction cooker with heat retention function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The electromagnetic cooker with the heat retention function of the present invention will be described in detail according to the following items.

A. Industrial application field B. Outline of the invention C. Conventional technology [Fig. 7] D. Problems to be solved by the invention E. Means to solve the problems F. Embodiments [Figs. 1 to 6] Figures] a. Appearance [Figs. 1 to 3] b. Circuit configuration [Figs. 4 and 5] b-1. Overview [Fig. 4] b-2. Temperature detection [Fig. 5] c. Action [Fig. 6] G. Effect of the invention (A. Industrial application field) The invention relates to a novel electromagnetic cooker with a heat retention function. More specifically, in an electromagnetic cooker having a heat retention function, a heat retention temperature setting unit for setting the heat retention temperature to a predetermined temperature is provided to expand a use range related to heat retention control, and the set value of the heat retention temperature is accidentally changed. It is an object of the present invention to provide a novel electromagnetic cooker with a heat retaining function in which a heat retaining temperature setting means is arranged in a place where the temperature does not easily change due to various reasons.

(B. Outline of the Invention) The present invention is an electromagnetic cooker with a heat retaining function having an operation unit having an operation unit for adjusting heating intensity and selecting a heat retaining control for keeping a temperature of an object to be heated constant. There is provided a heat retaining temperature setting means for setting the heat retaining temperature to a predetermined temperature, by providing the heat retaining temperature not on the same plane as the surface on which the operator is provided and on another mounting surface separated from the operator. The heat retention temperature can be varied, and the heat retention temperature once set is not easily changed by an accidental factor (for example, contact or the like).

(C. Prior art) [Fig. 7] Some electromagnetic cookers have functions to adjust the intensity of heating,
A device having a heat retaining function of maintaining a temperature of a heated object at a predetermined value is known.

In other words, the intensity of heating is adjusted by continuously varying the output (electric power), while the temperature-maintaining function detects the temperature of the object to be heated by a temperature sensor and uses the detection signal as a feedback signal. Temperature control is performed.

FIG. 7 is a circuit diagram showing an example a of temperature detection related to the conventional heat retention control. In this example, a thermistor b is used as a temperature sensor.

A voltage obtained by dividing a power supply voltage (this is described as “+ B”) by a resistor d and a thermistor b is input to a minus input terminal of the comparator c, and a resistor e,
A reference voltage defined by f, switch g, and resistor h is input.

That is, the power supply voltage B is applied to one end of the resistor e, the other end is grounded via the resistor f, and a switch g and a resistor h are provided in parallel with the resistor e. The positive input terminal of the comparator c is connected between the resistors e and f.

When the switch g is closed, when the switch g is closed, the comparison reference value of the comparator c becomes a value obtained by dividing the power supply voltage B by the parallel combined resistance value of the resistors e and h and the resistance value of the resistor f. The heat retention temperature is set according to the value.

Note that when the switch g is open, the comparison reference value of the comparator c is equal to the voltage value obtained by dividing the power supply voltage B by the resistance values of the resistors e and f. This value defines the upper limit temperature during heating. I have.

(D. Problems to be Solved by the Invention) By the way, in the conventional electromagnetic cooker, the set temperature at the time of heat retention is a fixed value (that is, a value determined by the selection of the resistance values of the resistors e, f, and h). Therefore, there is a problem that it is not possible to cope with a situation in which it is desired to control at a set temperature suitable for the size and shape of the pot as a load and the type of dish.

Therefore, in such a case, it is conceivable to change the circuit so that the heat retaining temperature can be set freely and provide a knob for setting the heat retaining temperature on the operation surface.

However, in this case, while the user is setting the desired heat insulation temperature and then cooking using the electromagnetic cooker, the user touches the heat insulation temperature setting knob with a certain beat and the set temperature is an unexpected temperature There is a danger that it will change. Therefore, the user must be constantly careful that the set value of the heat retention temperature is an intended value, which is very troublesome.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the electromagnetic cooking device with a heat retaining function of the present invention has a heat retaining control for adjusting the heating intensity and keeping the temperature of the object to be heated constant. An electromagnetic cooker provided with a heat retaining function having an operation unit having an operator for selection, wherein a heat retaining temperature setting unit for setting a heat retaining temperature to a predetermined temperature is the same as a surface on which the operator is provided. It is provided on another mounting surface which is not a plane and is separated from the operation element.

Therefore, according to the present invention, it is possible to freely select the heat retaining temperature depending on whether the food is a pot or a dish, etc., and of course, the operation temperature control means is provided with an operation element of an operation unit that frequently uses the heat retaining temperature setting means. Since it is arranged on a plane different from the surface and at a place separated from the operator, there is no inconvenience that the once set heat retention temperature is changed by accidental factors such as contact. .

(F. Embodiment) [FIGS. 1 to 6] Hereinafter, details of the electromagnetic cooker with a heat retaining function of the present invention will be described according to the illustrated embodiment.

(A. Appearance) [FIGS. 1 to 3] Reference numeral 1 denotes an electromagnetic cooker, which includes a cooker main body and a control unit.

Reference numeral 2 denotes a cooker main body. A high-frequency induction heating device (not shown) is housed in a shallow box-shaped housing 3, and the upper surface thereof is covered with a top plate 4. The top plate 4 is preferably a plate-shaped member that is not heated by high-frequency induction and has a desired strength. For example, a reinforced glass ceramic is used.

5 is a sash, which is used for the top plate 4
Is pressed down at its peripheral edge and held against the housing 3.
The sash 5 is made of, for example, stainless steel.

Reference numeral 6 denotes a control unit for adjusting a heating temperature,
A slide lever for selecting heat retention control, a light emitting element for displaying a state, and the like are provided.

Reference numeral 7 denotes a front plate of the control unit 6, and a slide lever 8 is provided on a portion of the front surface of the control unit 6 except for a left end portion so as to be movable in the left-right direction.

The slide lever 8 is powered off at the left end of the moving range, that is, forms a power-off state, forms a "heat keeping mode" at a position immediately to the right, and moves from the right side of the "heat keeping mode" position to the right. A "heating mode" is formed up to the middle right end. At the left end of the "heating mode" position, "low temperature" is at the right end, and "high temperature" is at the right end. Between the right end and the left end, the heating temperature gradually increases toward the right end.

Then, a quick stop is applied to the slide lever 8 between the power “off” position and the “warming mode” position.

That is, the slide lever 8 has a role as a variable resistance slider in the movement range in the heating mode, and has a role as a switch in the power supply "off" or "heat keeping mode" position.

Numeral 9 denotes a display portion formed on the upper edge of the front plate 7 facing diagonally upward and forward, and a display "OFF" 9a indicating the power OFF position of the slide lever 8 and a display indicating the "heat retention mode" position. "Heat insulation" 9b, low and medium temperature in the "heating mode" area,
Indication indicating each position of high temperature "Low" 9c, "Medium" 9d, "High" 9e
Are displayed respectively.

Reference numerals 10a and 10b denote light emitting display portions provided on the left end of the front plate 7 side by side, and for example, light emitting diodes (LEDs) are used.

These light-emitting display units 10a and 10b are for displaying a warming state and a heating state, respectively.The light-emitting display unit 10a for displaying a warming state includes, for example, a green light emitting LED, and For example, an LED that emits red light is used for the light-emitting display unit 10b that indicates that the device is in a heated state.

Then, the light emitting display section 10 of the upper edge of the front plate 7 is formed.
The character 11a of "heat retention" is displayed at a location corresponding to "a", and the character 11b of "heating" is displayed at a location corresponding to the light emitting display unit 10b.

Reference numeral 12 denotes a case projecting rearward from the rear surface of the front plate 7, and a control circuit including necessary electronic components and the like is housed in the case 12.

Reference numeral 13 denotes a preset knob provided on the rear surface of the case 12. By adjusting the rotation of the preset knob 13, the heat retaining temperature in the "heat retaining mode" can be set. Reference numeral 14 denotes a scale indicating the heat retention temperature which can be set by the preset knob 13 (see FIG. 2).

The above-described electromagnetic cooker 1 is used by being set on a cooking table, a dining table or the like.

For example, when setting on a worktop, the top plate of worktop 15
The cooker main body 2 is attached to the top plate 16 of the worktop 15 so that the mounting hole 17 formed in the cooker main body 2 can be inserted downward from a flange 5a provided at the upper end of the sash 5 of the cooker main body 2, 6 is inserted into the worktable 15 through the mounting hole 19 formed in the front plate 18 of the worktable 15 so that the front plate 7 is
Attach it so that it protrudes from the front of 18. Reference numeral 20 denotes a control circuit for the output coil in the cooking device main body 2 and the control unit 6.
This is the code that connects to the control circuit inside.

Therefore, when the electromagnetic cooker 1 is set on the cooking table 15, only the front plate 7 of the control unit 6 is attached to the front plate 18.
On the surface of the preset preset knob 13
As long as the user does not operate, the set value of the heat retention temperature does not change.

(B. Circuit Configuration) [FIGS. 4 and 5] In the electromagnetic cooker 1, when a current flows through an output coil provided below the top plate 4, lines of magnetic force are generated, and a current that may be generated in the pan due to the current is generated. It uses the principle that the pot itself generates heat as Joule heat due to the resistance of the pot.

(B-1. Outline) [Fig. 4] Fig. 4 is a simplified block diagram showing the circuit 21 of the electromagnetic cooker 1.

The AC input voltage is full-wave rectified by the diode bridge 22 and then sent to a series circuit of a spiral output coil 26 and a transistor 27 via a smoothing capacitor 23 and a filter circuit including a choke coil 24 and a capacitor 25 at the subsequent stage. Can be

28 is a resonance capacitor provided in parallel with the output coil 26, and 29 is a damper diode provided in parallel with the transistor 27.

30 is an oscillator whose output signal is a drive circuit
The signal becomes a switching control signal of the transistor 27 via 31.

Reference numeral 32 denotes an oscillator control unit provided for controlling the oscillator 30, which is provided for controlling the operation of the oscillator 30 and controlling the oscillation frequency in accordance with a signal from the temperature control unit 33.

The temperature control unit 33 includes an output control unit 33a relating to control in the heating mode of the electromagnetic cooker 1, and a heat retention control unit 33b relating to control in the heat retention mode.

That is, the output control unit 33a sends a control signal corresponding to the resistance value of the volume that is changed by the slide lever 8 to the oscillator control unit 32 in the heating mode,
Thus, the frequency of the oscillator 30 is controlled by the oscillator control unit 32 and the power of the output coil 26 is controlled.

In addition, a signal from a temperature sensor 34 provided on the lower surface of the top plate 4 is sent to the temperature keeping circuit 33b.
Is sent through. Then, when the slide lever 8 is set to the heat retaining position (9b), the temperature maintained by the preset knob 13 is set as a control target value and the temperature sensor
A control signal is sent to the oscillator control unit 32 so that the actual temperature detected by the controller 34 becomes the target temperature. As a result, the on / off control of the oscillator 30 is performed, and the temperature of the object to be heated placed on the top plate 4 is maintained at a predetermined temperature.

Although not shown, the power supply voltage to the control system circuit is obtained from a stabilized power supply circuit (that is, provided in parallel with the diode bridge 22) which is different from the power supply system to the output coil 26. ing.

(B-2. Temperature Detection) [FIG. 5] FIG. 5 is a circuit diagram showing an example of the temperature detection circuit 35 and the heat retention control unit 33b.

In the figure, reference numeral 36 denotes a variable resistor using the preset knob 13 as a slider, a power supply voltage (referred to as "+ B") is applied to one end, and a temperature sensor 34 (thermistor in this example) is applied to the other end. ) Is grounded through.

Reference numerals 37 and 38 denote voltage dividing resistors. The power supply voltage B is applied to one end of the resistor 37, and the other end is grounded via the resistor 38.

39 is a switch, 40 is a resistor, and these are provided in parallel with the resistor 37. The switch 39 is a heat-retaining switch, and is closed when the slide lever 8 is in the heat-retaining position (9b), and is open otherwise.

Reference numeral 41 denotes a comparator, the minus input terminal of which is connected between the variable resistor 36 and the temperature sensor 34, and the plus input terminal of which is connected between the resistors 37 and 38.

Thus, in the warming mode formed by closing the switch 39, the actual temperature detected by the temperature sensor 34, the variable resistor 36, the voltage dividing resistors 37, 38,
The magnitude relationship between the temperature and the heat retention temperature defined by the resistance value of the resistor 40 is compared by the comparator 41, and a binary signal corresponding to the comparison result is sent to the oscillator control unit 32.

That is, the resistance value of the thermistor is “R _TH ” and the variable resistance
Assuming that the resistance value of the resistor 36 is "VR" and the resistance values of the resistors ₃₇ , ₃₈ , and ₄₀ are R37, R38, and R40, respectively, when the switch 39 is closed, Is compared in the comparator 41,
By varying the resistance value VR with the preset knob 13, it is possible to set (preset) a desired heat retaining temperature in advance.

When the switch 39 is open, this circuit functions as a protection circuit that regulates the upper limit of the heating temperature, as in the related art.

(C. Operation) [FIG. 6] In the electromagnetic cooker 1 described above, it is a matter of course that the preset temperature can be set to a desired value by the preset knob 13 in the thermal mode. This preset knob 13 is not provided in the front plate 7 that is usually used frequently, and the position where the user cannot easily touch it when the electromagnetic cooker 1 is installed on the cooking table 15, that is, the back surface of the case 12. Is provided.

Therefore, the installer of the electromagnetic cooker 1 asks the user who is in the position of actually using the electromagnetic cooker 1 about the desired heat retention temperature, turns the preset knob 13 and sets the heat retention temperature, and then sets the electromagnetic cooker. After completing the work of attaching 1 to the worktable 15, the user may inadvertently
There is no need to worry about touching the 13 and changing the setting of the heat retention temperature.

In the above description, the present invention is applied to the electromagnetic cooker 1 of a type in which the cooker main body 2 and the control unit 6 are separated. However, as shown in FIG. The present invention can also be applied to an electromagnetic cooker 1A of a type in which the control unit 6 is attached to the side surface of the housing 3 of the cooker main body 2.

In this case, the preset knob 13 is placed on the rear or bottom surface of the main body 2 or inside the main body (however, a position that can be adjusted from the outside). It should be provided in a suitable place.

(G. Effect of the invention) As is clear from the above description, the electromagnetic cooker with the heat retention function of the invention adjusts the heating intensity and selects the heat retention control that keeps the temperature of the heated part constant. An electromagnetic cooker with a heat retention function having an operation unit having an operation element for the heat insulation temperature setting means for setting the heat retention temperature to a predetermined temperature, not the same plane as the surface on which the operation element is provided In addition, it is provided on another mounting surface that is separated from the operation element.

Therefore, according to the present invention, it is possible to freely select the heat retaining temperature depending on whether the food is a pot or a dish, etc., and of course, the operation temperature control means is provided with an operation element of an operation unit that frequently uses the heat retaining temperature setting means. Since it is arranged on a plane different from the surface and at a place separated from the operator, there is a disadvantage that the heat retention temperature once set is changed by accidental factors such as contact. Disappears.

It should be noted that the above-described embodiment is merely an example of the present invention, and the technical scope of the electromagnetic cooker with a heat retaining function of the present invention is not to be construed as being narrow. For example, in the above-described embodiment, the selection of the heat retaining mode is performed by moving the slide lever to a specific position within the movable range. However, the present invention is not limited to this. A switch may be provided, and it goes without saying that all of the embodiments without departing from the spirit of the present invention are included in the technical scope of the present invention.

[Brief description of the drawings]

1 to 6 show an embodiment of the electromagnetic cooker with a heat retaining function of the present invention, and FIG. 1 is a perspective view showing the appearance.
FIG. 2 is an enlarged rear view of the control unit, FIG. 3 is a longitudinal sectional view showing an installation state on a cooking table, FIG. 4 is a circuit block diagram showing an outline of a circuit configuration, and FIG. 5 is an example of temperature detection. FIG. 6 is a perspective view showing another embodiment of the present invention with a part cut away, and FIG. 7 is a circuit diagram showing an example of temperature detection in a conventional electromagnetic cooker. DESCRIPTION OF SYMBOLS 1 ... Electromagnetic cooker with heat retention function, 6 ... Operation unit, 8 ... Operator, 13, 36 ... Insulation temperature setting means, 1A ... Electromagnetic cooker with heat retention function

Claims (1)

(57) [Scope of request for utility model registration] 1. An electromagnetic cooker with a heat retaining function, comprising an operation unit having an operation unit for adjusting heating intensity and selecting a heat retaining control for keeping a temperature of an object to be heated constant. A heat insulation temperature setting means for setting the temperature at a predetermined temperature is provided not on the same plane as the surface on which the operation element is provided, but on another mounting surface separated from the operation element. With electromagnetic cooker.