KR100790032B1 - Cooking utensil - Google Patents

Abstract

The present invention relates to a cooking appliance having a plurality of ignition heaters which are heating means for heating food.

In another embodiment of the present invention, a cooking appliance includes a first ignition heater for heating food, a first branch gas pipe connected in series with the first ignition heater, and guiding a gas supplied to the first ignition heater. A first safety valve for controlling opening and closing, a second ignition heater for heating food, and a first branch gas pipe connected in series with the second ignition heater and guiding a gas supplied to the second ignition heater. A second safety valve for controlling opening and closing, a first relay unit for supplying an AC voltage to the first ignition heater and the first safety valve, and connected to the first relay unit, And a second relay unit for supplying an AC voltage to the second safety valve.

In the case of the present invention having such a configuration, it is possible to prevent the plurality of ignition heaters operating at the same time even if the runaway of the microcomputer or malfunction of the electrical equipment.

Cooker, Ignition Heater, Safety Valve, Relay, 3-Terminal

Description

Cooking utensils {Cooking utensil}

1 is a schematic block circuit diagram illustrating a method of operating an ignition heater installed in a general electronic cooking appliance.

FIG. 2 is a graph illustrating resistance, temperature, and current characteristics of the ignition heater and the safety valve over time among the components disclosed in FIG. 1.

3 is a schematic block circuit diagram illustrating a method of operating an ignition heater installed in an electronic cooking appliance according to the present invention.

* Description of the symbols for the main parts of the drawings

10: plug 21, 31: ignition heater

22, 32: safety valves 23, 33: branch gas piping

25, 35: relay unit 40: microcomputer

The present invention relates to a cooking appliance, and more particularly, to a cooking appliance having a plurality of ignition heaters which are heating means for heating food. More specifically, the present invention relates to a cooking appliance having a relay unit capable of preventing the plurality of ignition heaters from operating simultaneously.

FIG. 1 is a block circuit diagram illustrating a method of operating the ignition heater of the cooking appliance by a microcomputer installed in the electric field of a conventional general cooking appliance such as an electric gas range, an electric oven range, a gas oven range, and the like. have.

In FIG. 1, the plug 10 is a device coupled to an outlet (not shown) to which a household AC voltage (eg, 220V) is supplied, and the AC voltage input through the outlet flows through the wires L1 and L2.

Ignition heaters 21 and 31 represent an ignition heater for an oven and a grill ignition heater which are respectively installed on the upper and lower parts of a cooking chamber of a cooking appliance, and the ignition heaters 21 and 31 increase the amount of current flowing through them. As it gets hotter, it gets hotter.

Meanwhile, safety valves 22 and 32 (safety valves) installed at one side of the branched gas pipes 23 and 33 respectively branched from the main gas pipes (not shown) supplied with the gas used in the cooking appliance are each branched. It controls whether the gas pipes 23 and 33 are opened or closed.

As is well known to those skilled in the art, safety valves have the property of opening when a predetermined amount of threshold current flows. When the safety valves 22 and 32 are opened, the gas is discharged into the gas discharge holes 23a and 33a of the branch gas pipes 23 and 33.

The relays 24 and 34 are two-terminal electronic switches that connect the terminals a and b, respectively, in response to the control signal of the microcomputer 40 installed in the electronic device, or the terminals c and the terminal ( d) serves to connect. In other words, the microcomputer 40 controls the switch SW1 of the relay unit 24 to determine whether the terminal a is connected to the terminal b, and controls the switch SW2 of the relay unit 34. To determine whether to connect between the terminal (c) and the terminal (d).

FIG. 2 is a graph illustrating resistance, temperature, and current characteristics of the ignition heaters 21 and 31 and the safety valves 22 and 32 with respect to FIG. 1 according to time.

In Fig. 2, curve A is a schematic resistance characteristic graph of a general ignition heater, curve B is a schematic temperature characteristic graph of a general ignition heater, curve C is a current characteristic graph of a general safety valve, Curve D is a graph for explaining the open / closed state of the safety valve according to the graph characteristic.

The graph characteristics shown in FIG. 2 will be briefly described with reference to FIG. 1.

For example, assume that the switch SW1 of the relay unit 24 is turned on under the control of the microcomputer 40 so that the terminal a and the terminal b are connected to each other.

Then, the AC voltage applied through the plug 10 supplies a current to the closed loop consisting of the wire L1, the relay unit 24, the safety valve 22, the ignition heater 21, and the wire L2. .

When a current is supplied to the closed loop formed as described above, as shown in FIG. 2, as time passes, the temperature of the ignition heater 21 gradually increases (inversely, the resistance of the ignition heater is And the amount of current flowing through the safety valve 22 begins to increase.

As shown, when the amount of current flowing through the safety valve 22 reaches a predetermined level (i.e., when it intersects the point indicated by time T), the closed safety valve 22 is opened (curve "D"). )

When the safety valve 22 is opened, the gas is discharged to the gas discharge hole 23a along the branch gas pipe 23.

At this time, since the ignition heater 21 is sufficiently heated, the gas discharged from the gas discharge hole 23a is ignited by the heat generated in the ignition heater 21.

This process is the same even when the relay unit 34 is turned on.

However, the conventional cooking appliance has the following problems.

Usually, in the case of an electronic cooking appliance in which an oven ignition heater 21 and a grill ignition heater 31 are installed at the same time in one cooking chamber, the two ignition heaters 21 and 31 may be used in order to satisfy the temperature specification in the cooking chamber. ) Is controlled to be controlled by the microcomputer 40 so as not to operate at the same time.

However, in the case of a cooking appliance (for example, an electronic gas oven) to which the safety valves 22 and 32 are applied as described above, due to the influence of runaway of the microcomputer 40 or foreign matter accumulated in the electric field, There is a problem that often occurs when the two ignition heaters 21 and 31 operate simultaneously.

For this reason, conventionally, when a malfunction of a cooking appliance occurs, a temperature in the cooking chamber may increase rapidly, causing a fire accident or the like.

The present invention has been proposed to solve the above-mentioned problem, and in a cooking apparatus in which a plurality of ignition heaters are installed in one cooking chamber, a cooking apparatus having a relay unit capable of independently and stably operating the plurality of ignition heaters is provided. It aims to provide.

To this end, an object of the present invention is to provide a cooking unit capable of blocking the operation of a plurality of ignition heater by providing a relay unit consisting of a three-terminal electronic switch and a relay unit consisting of a two-terminal electronic switch.

The cooking apparatus according to the embodiment of the present invention includes a first relay unit 25 for applying an alternating voltage to the first ignition heater 21 for heating a food seated in a cooking chamber, and a cooking settled in the cooking chamber. And a second relay unit 35 for applying the AC voltage to the second ignition heater 31 for heating water, wherein the AC voltage is applied to one of the first and second ignition heaters. The first and second relay unit is characterized in that the linkage.

In an embodiment of the present invention, the first relay unit is a three-terminal electronic switch, and the second relay unit is a two-terminal electronic switch.

In an embodiment of the present invention, the third terminal electronic switch has first to third terminals (e, a, b), and the second terminal electronic switch comprises fourth and fifth terminals (c, d). The first and second terminals (e, a) are connected to each other, the AC voltage is applied to the first ignition heater, and the first and third terminals (e, b), the third terminal and the The fourth terminal (b, c), and the fourth terminal and the fifth terminal (c, d) is connected, characterized in that the AC voltage is applied to the second ignition heater (31).

In an embodiment of the present invention, the microcomputer 40 further controls the operation of the third terminal electronic switch and the second terminal electronic switch.

In an embodiment of the present invention, opening and closing of the first branch gas pipe connected between the second terminal a and the first ignition heater 21 to guide the gas supplied to the first ignition heater 21. A second branch gas connected between the first safety valve 22 to be controlled and the fifth terminal d and the second ignition heater 31 to guide the gas supplied to the second ignition heater 31. It is characterized by further comprising a second safety valve 32 for controlling the opening and closing of the pipe.

In another embodiment of the present invention, a cooking appliance includes a first ignition heater for heating food, a first branch gas pipe connected in series with the first ignition heater, and guiding a gas supplied to the first ignition heater. A first safety valve for controlling opening and closing, a second ignition heater for heating food, and a first branch gas pipe connected in series with the second ignition heater and guiding a gas supplied to the second ignition heater. A second safety valve for controlling opening and closing, a first relay unit for supplying an AC voltage to the first ignition heater and the first safety valve, and connected to the first relay unit, And a second relay unit for supplying an AC voltage to the second safety valve.

In another embodiment of the present invention, the first relay unit is composed of a three-terminal electronic switch that implements one of a first switching state and a second switching state, and the second relay unit is composed of a two-terminal electronic switch. It is done.

In another embodiment of the present invention, when the third terminal electronic switch is in the first switching state, an AC voltage is supplied to the first ignition heater and the first safety valve, and the third terminal electronic switch is connected to the first terminal. In the second switching state, when the two-terminal electronic switch is turned on, the AC voltage is supplied to the second ignition heater and the second safety valve.

Hereinafter, a preferred embodiment of a cooking appliance according to the present invention will be described with reference to the drawings.

For reference, the technical idea of the present invention to be described below may be applicable to all types of cooking apparatuses having a plurality of heating means, that is, a plurality of ignition heaters, in one cooking chamber. In addition, the present invention is intended to facilitate the understanding of the technical idea proposed by the present invention by using the same reference numerals for components having substantially the same configuration and function as the conventional components.

3 is a block circuit diagram for explaining a method of operating the ignition heater of the cooking apparatus by the microcomputer 40 installed in the electrical equipment of the cooking apparatus according to the present invention.

In FIG. 3, the plug 10 is a device coupled to an outlet (not shown) to which a household AC voltage (eg, 220V) is supplied, and the AC voltage input through the outlet flows through the wires L1 and L2. In general, the plug 10 is connected to the main body of the electronic cooking appliance through the wires (L1, L2)

Ignition heaters 21 and 31 represent an ignition heater for an oven and a grill ignition heater which are respectively installed on the upper and lower parts of a cooking chamber of a cooking appliance, and the ignition heaters 21 and 31 increase the amount of current flowing through them. As it gets hotter, it gets hotter.

On the other hand, safety valves (22, 32: safety valves) are respectively provided on one side of the branched gas pipes (23, 33) branched from the main gas pipe (not shown) for guiding the supply of gas used in the cooking appliance It controls whether the branch gas pipes 23 and 33 are opened or closed. As is well known to those skilled in the art, the safety valves 22 and 32 have a characteristic of opening at a moment when a predetermined amount or more of current, that is, a threshold current flows. When the safety valves 22 and 32 are opened, the gas is discharged into the gas discharge holes 23a and 33a of the branch gas pipes 23 and 33.

The relay section 25 is a three-terminal electronic switch and includes a switch SW3 that responds to a control signal of the microcomputer 40 provided in the electric component section. The three-terminal electronic switch may be implemented using an electronic circuit or a mechanical switch controlled by an electronic signal, and generally has a first switching state and a second switching state.

The relay unit 25 including the three-terminal electronic switch is provided with three terminals e, a, and b, and the terminal e and the terminal a are connected by a control signal applied from the microcomputer 40, Terminal (e) and terminal (b) are connected. Here, the state in which the terminal e and the terminal a are connected may be referred to as a first switching state, and the state in which the terminal e and the terminal b are connected may be referred to as a second switching state.

The terminal (e) is connected to the wire (L1) which is one of the wires for supplying an AC voltage through the plug 10, the terminal (a) is connected to the safety valve (22). The terminal b is connected to the terminal c of the relay unit 35 to be described below.

The relay unit 35 is a two-terminal electronic switch similar to the conventional one, and includes a switch SW4 that responds to a control signal of the microcomputer 40 provided in the electronic device.

As shown, the relay unit 35 composed of a two-terminal electronic switch is provided with two terminals c and d, and between the terminal c and the terminal d by a control signal applied from the microcomputer 40. The connection is determined. As described above, the terminal c of the relay unit 35 is connected to the terminal b of the relay unit 25, but the terminal d of the relay unit 35 is connected to the safety valve 32. It is.

On the other hand, among the wires L1 and L2 mounted on the plug 10, the wire L2 is connected to one end of the ignition heater 21, and the other terminal of the ignition heater 21 is a safety valve 22. It is connected to one end of. And the other terminal of the safety valve 22 is connected with the terminal e of the relay part 25 as mentioned above.

Therefore, when the terminal e and the terminal a are interconnected by the switch SW3 of the relay unit 25 controlled by the microcomputer 40, the plug 10-the wire L1-the terminal e A closed loop consisting of the terminal (a), the safety valve (22), the ignition heater (21), the electric wire (L2), and the plug (10) is formed. Hereinafter, this will be referred to as a first closed loop.

When the first closed loop as described above is formed, current flows in the first closed loop by an AC voltage supplied to the wires L1 and L2 through the plug 10.

When current starts to flow along the first closed loop, the ignition heater 21 having the resistance and temperature characteristics described with reference to FIG. 2 decreases in its own resistance and starts to heat hot, and the current flowing through the safety valve 22. Will increase. As soon as the current flowing through the safety valve 22 exceeds a predetermined threshold, the safety valve 22 that has closed the branched gas pipe 23 opens. As a result, the gas is discharged through the gas discharge hole 23a, which is the end of the branch gas pipe 23, and the discharged gas is ignited under the influence of the heated ignition heater 21.

As described above, when the ignition heater 21 is to be operated, the microcomputer 40 controls the switch SW3 of the relay unit 25 composed of a three-terminal electronic switch to control the terminal a and the terminal ( e) take the form of connection.

On the other hand, when the ignition heater 31 is to be operated, the microcomputer 40 controls the switch SW3 of the relay unit 25 composed of a three-terminal electronic switch to control the terminal b and the terminal e. It connects, and controls the switch SW4 of the relay unit 35 composed of a two-terminal electronic switch to connect the terminal (c) and the terminal (d).

In this case, the plug 10, the wire L1, the terminal E, the terminal B, the terminal C, the terminal D, the safety valve 32, the ignition heater 31, the wire L2, A closed loop consisting of the plug 10 is formed. Hereinafter, this will be referred to as a second closed loop.

When current starts to flow along the second closed loop thus formed, the ignition heater 31 having the resistance and temperature characteristics described with reference to FIG. 2 decreases in its own resistance and starts to heat hot, and flows to the safety valve 32. The current will increase. As time passes and the current flowing through the safety valve 32 exceeds a predetermined threshold, the safety valve 32 that has closed the branched gas pipe 33 opens. As a result, the gas is discharged through the gas discharge hole 33a, which is the end of the branch gas pipe 33, and the discharged gas is ignited under the influence of the hotly heated ignition heater 31.

Hereinafter, the operation of the cooking appliance according to the present invention will be described in detail.

First, a user selects a cooking time, a cooking temperature, an oven operation or a grill operation by pressing a function button of a cooking apparatus while the food is placed in a cooking chamber, and presses a cooking start button. For convenience of explanation, it is assumed that the user has selected the oven operation button.

When the cooking start button is selected, the microcomputer 40 of the cooking appliance determines the cooking condition set by the user.

Since the oven operation button is selected, the microcomputer 40 controls the switch SW3 of the relay unit 25 made of a three-terminal electronic switch to connect the terminal e and the terminal a.

When the terminal (e) and the terminal (a) are connected, the plug 10-the wire (L1)-terminal (e)-terminal (a)-safety valve 22 by the AC voltage input through the plug 10 The current starts to flow along the first closed loop consisting of the ignition heater 21, the wire L2, and the plug 10.

Under the influence of the current flowing in this way, the ignition heater 21 starts to heat, and the current flowing in the safety valve 22 starts to increase. When the current flowing through the safety valve 22 exceeds a predetermined threshold, the safety valve 22 that has cut off the branch gas pipe 23 opens.

When the safety valve 22 is opened, the gas guided by the branch gas pipe 23 is discharged through the gas discharge hole 23a. The discharged gas is ignited under the influence of the hotly heated ignition heater 21.

In this state of ignition, the microcomputer 40 operates the relay unit 25 so that the temperature of the gas ignited by the ignition heater 21 can maintain the cooking temperature set by the user during the cooking time set by the user. Control. For example, when the temperature of the gas ignited by the ignition heater 21 exceeds the set cooking temperature, the switch SW3 of the relay unit 25 connecting between the terminal e and the terminal a is connected to the terminal ( e) and the terminal (b) to be connected to block the AC voltage applied to the ignition heater 21 for a predetermined time.

Next, a case in which the user selects an operation button to draw will be described.

Since the grill operation button is selected, the microcomputer 40 controls the switch SW4 of the relay unit 35 composed of a two-terminal electronic switch to connect the terminal c and the terminal d.

Since the terminal e and the terminal b of the relay unit 25 are connected by the switch SW3, when the terminal c and the terminal d of the relay unit 35 are connected, the plug 10 Plug 10, wire L1, terminal e, terminal b, terminal c, terminal d, safety valve 32, ignition heater 31, and The current starts to flow along the second closed loop consisting of the wire L2-plug 10.

Under the influence of the current flowing in this way, the ignition heater 31 starts to heat, and the current flowing in the safety valve 32 starts to increase. When the current flowing through the safety valve 32 exceeds a predetermined threshold, the safety valve 32 that has cut off the branch gas pipe 33 opens.

When the safety valve 32 is opened, the gas guided by the branch gas pipe 33 is discharged through the gas discharge hole 33a. The discharged gas is ignited under the influence of the hotly heated ignition heater 31.

In this state of ignition, the microcomputer 40 operates the relay unit 35 so that the temperature of the gas ignited by the ignition heater 31 can maintain the cooking temperature set by the user during the cooking time set by the user. Control.

As can be seen from the description so far, the cooking appliance according to the present invention, by connecting the relay unit 25 consisting of a three-terminal electronic switch and the relay unit 35 consisting of a two-terminal electronic switch, two ignition heaters 21 , Operate independently.

Unlike the conventional technique of using only two-terminal electronic switches, the present invention is characterized in that a three-terminal electronic switch is adopted.

In particular, when the terminal e and the terminal a are connected by the switch SW3 controlled by the microcomputer 40, the AC voltage is supplied only to the first closed loop, and the AC voltage supply to the second closed loop is You can see that it is automatically blocked.

On the other hand, when the terminal (e) and the terminal (b) is connected by the switch (SW3) controlled by the microcomputer 40, the AC voltage supply to the first closed loop is automatically cut off. In this state, when the relay section 35 is turned on (that is, the switch SW4 is controlled to connect the terminal c and the terminal d), the AC voltage is supplied to the second closed loop.

That is, in the case of the present invention, due to the presence of the relay unit 25 consisting of the three-terminal electronic switch, the case where the AC voltage is applied simultaneously to the first closed loop and the second closed loop does not actually occur.

The scope of the technical idea of the present invention is not limited to the embodiment of the cooking appliance disclosed in FIG. 3, and a plurality of ignition heaters are operated simultaneously by individually selecting closed loops to which an AC voltage is applied using a three-terminal electronic switch. It should be considered to include all types of cooking appliances that are implemented not to.

As described above, the present invention provides a cooking apparatus in which a plurality of ignition heaters are prevented from operating at the same time by using a relay unit consisting of a three-terminal electronic switch and a two-terminal electronic switch.

In the case of the present invention having such a configuration, it is possible to prevent the plurality of ignition heaters operating at the same time even if the runaway of the microcomputer or malfunction of the electrical equipment.

In addition, in the case of using the cooking appliance proposed by the present invention, since only one ignition heater of the plurality of ignition heaters installed in the cooking chamber can be stably operated, a fire accident that may occur due to heating of the ignition heaters. There is an advantage that can be blocked in advance.

Claims (11)

delete delete delete delete delete delete delete delete delete First and second wires to which an AC voltage is applied; A three terminal switch controlled by a microcomputer and having first to third terminals; A two-terminal switch controlled by the microcomputer and having fourth and fifth terminals; A first ignition heater formed on one side of the cooking chamber to heat the food seated in the cooking chamber; A second ignition heater formed on the other side of the cooking chamber to heat the food seated in the cooking chamber; A first safety valve controlling whether or not the gas supplied to the first ignition heater is supplied; And a second safety valve for controlling whether or not the gas supplied to the second ignition heater is supplied. The first wire is connected to the first terminal, The second electric wire is connected to each side of the first ignition heater and the second ignition heater, The other side of the first ignition heater is connected to one side of the first safety valve, the other side of the second ignition heater is connected to one side of the second safety valve, The other side of the first safety valve is connected to the second terminal, The other side of the second safety valve is connected to the fifth terminal, The third and fourth terminals have a configuration that is interconnected, The third terminal switch selectively implements one of a first switching state in which the first terminal and a second terminal are connected, and a second switching state in which the first terminal and the third terminal are connected to the first ignition heater. Cooking device, characterized in that for blocking the simultaneous operation of the second ignition heater. The method of claim 10, When the third terminal switch is in the first switching state, an AC voltage is supplied to the first ignition heater and the first safety valve. And the AC terminal is supplied to the second ignition heater and the second safety valve when the third terminal switch is turned on in the second switching state.

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