KR200144987Y1 - electric rice cooker - Google Patents

Abstract

The present invention relates to a heating circuit of an electric rice cooker, and more particularly, to a heating circuit of an electric rice cooker configured to perform a porridge function by using a switching action in addition to the cooking function and the warming function performed by the electric rice cooker.

The present invention provides a closed loop including a first switching means switched to first and second mode states, and a power source and cooking heat unit and the first switching means when the first switching means is switched to the first mode state. And heating the rice bowl to form a closed loop including the power source, the cooking heating part and the first switching means when the lever switch and the first switching means are switched to the second mode state at the end of cooking temperature. And a second switching means which is turned off if the temperature sensed as the rice bowl is heated is a predetermined value or more.

Therefore, according to the present invention, by further connecting the temperature sensing element in the mechanical rice cooker by providing the porridge function and warming function in addition to the basic function of cooking and warming function of the electric rice cooker to expand the purchase range and provide satisfaction to the user It works.

Description

electric rice cooker

The present invention relates to an electric rice cooker, and more particularly, to an electric rice cooker which is improved to realize a function of cooking and keeping rice, as well as a function of cooking and warming, by simply using a switching element and a bimetal. will be.

In general, an electric rice cooker is a household appliance that performs a cooking function of boiling rice and keeps the temperature of the rice constant. Initially, the electric rice cooker was simply warmed by pressing the power switch by manual, but also served as a cooking function. It was developed.

A conventional electric rice cooker is disclosed in FIG.

Referring to FIG. 1, the conventional electric rice cooker has a lever switch 12, a cooking heat generating unit 14, and a heat sensing fuse 18 to a power supply unit 10 for supplying a predetermined rated voltage (for example, AC220V / 60 kV). It is configured to form a loop in series, the heat-insulating portion 14 is connected to the lever switch 12 in parallel.

The thermal generating unit 14 is connected to the thermal reed switch (TRS) 14A and the body heating unit 14B in series, and parallel to the lid heating unit 14C and the insulating diode display unit. 14D is connected and comprised.

The cooking heat generating unit 16 is configured such that the cooking diode display unit 16A and the heating plate 16B are connected in parallel.

The conventional electric rice cooker configured as described above is divided into an operation mode and a cooking function mode.

The lever switch 12 is configured to interlock with a magnet switch (not shown) using a ferrite characteristic installed in the heating plate 16B.

Specifically, as the heating plate 16B is heated, a container (not shown) containing an appropriate amount of water and rice inside the rice cooker is heated, and the ferrite property of the magnet switch is changed to the temperature at which the container is heated, and the magnet switch When the ferrite characteristic is removed, the lever switch 12 is turned off by moving the position of the contact.

Therefore, the lever switch 12 is kept on while cooking. However, when the temperature of the inside of the rice cooker rises by more than a predetermined value due to sufficient heating by the heating plate 16B, the lever switch 12 is turned off in conjunction with the magnet switch.

The cooking function mode and the warming function mode of the electric rice cooker are determined according to the turn on or turn off state of the lever switch 12 described above.

First, when the lever switch 12 is in the cooking mode in the ON state, current flows only to the cooking heat generating unit 16. Then, the light emitting diode (not shown) of the cooking diode display unit 16A is turned on, and the heating plate 16B generates heat, and the rice cooker performs the cooking operation.

The heating plate 16B continues to generate heat and when the cooking temperature reaches 140 ° C ± 5 ° C, the lever switch 12 is short-circuited by the above-described operation of the magnet switch. Then cooking of the rice cooker is finished.

The heating plate 16B has a considerably less load value than the load values of the body heater 14B and the lid heater 14C. Therefore, when the lever switch 12 is turned off so that the power supply unit 10, the heat generating heating portion 14, and the cooking heating portion 16 are formed in one closed loop, the cooking diode display portion 16A is proportional to the load value. The low voltage of the furnace is applied, and accordingly a sufficient voltage is not applied, so that the diode of the cooking diode display 16A is turned off. On the contrary, the light emitting diode is turned on because a high level voltage is applied to the insulating diode display unit 14D in proportion to the load value.

As described above, when cooking is terminated and the lever switch 12 is turned off, the insulation diode display unit 14D is turned on and the rice cooker is switched to the insulation function, at which time the power source 10, the heat generation unit 14, and the cooking heat An electrical loop including a portion 16 is formed, the lid heating element 14C generates continuous heat, the heating of the body heating element 14B is controlled by the switching of the TRS 14A, and the heating plate 16B is Small amount of heat is generated according to the load value.

The warming temperature of the cooked rice inside the rice cooker by the switching of the TRS 14A is maintained in the range of 73 ° C ± 2.5 ° C. If the temperature inside the rice cooker falls below 70.5 ° C, the TRS 14A is turned on and current flows to the body heater 14B. Then, as the body heater 14B is heated, the warming temperature inside the rice cooker is increased. When the warming temperature inside the rice cooker again rises above 75.5 ° C., the body heater 14B is stopped from heating by turning off the TRS 14A.

By the switching of the TRS (14A) described above, the thermal insulation temperature inside the rice cooker is maintained within a certain range. And when an abnormality is generated and the heating temperature of the rice cooker is overheated (167 ° C. or more) during warming or cooking, the heat sensing fuse 18 is short-circuited, thereby protecting the circuit of the rice cooker.

The conventional electric rice cooker as described above was limited in its function of keeping warm and cooking. In order to overcome this, recently, the development of microcomputer technology has transformed the sensing signals and switching signals necessary for keeping warm and cooking into an electronic control method, and additional functions such as moxibustion and bamboo functions have been added to the electric rice cooker. Fuzzy theory is introduced in the design of microcomputer for controlling rice cooker.

However, the electric rice cooker having a variety of functions of the above-mentioned conventional microcomputer has a serious economic burden to purchase and use because of high manufacturing cost. In addition, as the functions are diversified, there is a problem that a lot of effort is required to perform a desired function simply because the usage method is complicated.

It is an object of the present invention to provide an electric rice cooker that additionally has a function of heating or cooking something such as soup as well as a function of boiling porridge with a simple switch and bimetallic elements.

1 is a circuit diagram of an electric rice cooker having a conventional cooking and warming function.

2 is a circuit diagram showing an embodiment of an electric rice cooker according to the present invention.

Figure 3 is a graph showing different modes in the internal temperature of the rice cooker and the sensing temperature of the bimetal according to the present invention.

* Explanation of symbols for the main parts of the drawings

10, 20: Power supply part 12, 22B: Lever switch

14, 24: heat generating part 14A: TRS

14B, 24A: Body heater 14C, 24B: Lid heater

14D, 24C: Thermal insulation diode display unit 16, 26: Cooking heat generating unit

16A, 26A: Cooking diode display 16B, 26B: Heating plate

18, 28: thermal sensing fuse 22: switching unit

22A: Switch 22C: Bimetal

In an electric rice cooker according to the present invention for achieving the above object, in the electric rice cooker to perform cooking and warming by heating the inner rice bowl by a current flows in a closed loop formed by the power source, cooking heating unit and the warming heating unit, First switching means for switching to first and second mode states, and when the first switching means switches to a first mode state, a closed loop including the power source and the cooking heat unit and the first switching means is formed to Heating the rice bowl by forming a closed loop including the power source, the cooking heating unit and the first switching means when the lever switch and the first switching means which are turned off at the end of cooking temperature are switched to the second mode state. And a second switching means which is turned off when the temperature is sensed as the rice bowl is heated to a predetermined value or more.

In addition, the second switching means is preferably composed of bimetal, the turn-off temperature may be set to 70 ℃ to 80 ℃, the turn on temperature may be set to 45 ℃ to 55 ℃.

Hereinafter, with reference to the accompanying drawings, a specific embodiment of the present invention will be described in detail.

2 is a circuit diagram showing an embodiment of an electric rice cooker according to the present invention.

2, in the electric rice cooker according to the present invention, the power supply unit 20, the switching unit 22 and the cooking heat generating unit 26 supplying the rated voltage (AC220V / 60㎐) forms a closed loop, switching The thermal insulation heat generation part 24 is connected to the part 22 in parallel.

The switching unit 22 is configured such that either the lever switch 22B or the bimetal 22C forms a closed loop including the power supply unit 20 and the cooking heat generating unit 26 according to the switching state of the switch 22A. have.

The heat generating heat generating unit 24 is connected to the body heating unit 24A and the lid heating unit 24B in series, and the heat insulating diode display unit 24D is configured to be connected in parallel. In the cooking heat generating unit 26, the cooking diode display unit 26A and the heating plate 26B are connected in parallel. Meanwhile, a heat sensing fuse 28 is connected between the power supply unit 20 and the cooking heating unit 26.

An embodiment of the electric rice cooker according to the present invention configured as described above is divided into a first mode for cooking and a second mode for pickling pores according to the switching state of the switch 22A, and the first mode and the second mode described above. When is completed, keep warm mode.

First, when the switch 22A is switched to the first mode state for cooking, the switch 22A includes the power supply unit 20, the cooking heat generating unit 26, and the heat sensing fuse 28, like the lever switch 22B. To form a closed loop.

Then, when the lever switch 22B is turned on, the cooking diode display unit 26 is turned on, and the heating plate 26B is heated to perform the cooking operation. After a predetermined time has elapsed, when the cooking completion temperature is reached, the lever switch 22B is turned off, and the rice cooker is switched to the warming mode.

In the warm mode, the warm heat generating unit 24 and the cooking heat generating unit 26 are included in one loop. At this time, since the load value of the heat insulating portion 24 is considerably larger than that of the cooking heat generating portion 26, the heat insulating diode display portion 24C of the heat keeping heating portion 24 is turned on, and the cooking diode display portion of the cooking heat generating portion 26 is turned on. 26B goes out. And the body heat generating portion (24A) and the lid heat generating portion (24B) of the heat generating heating portion 26 is heated the rice cooker to perform the warming operation. At this time, since the heating plate 26B also generates a small amount of heat, the warming rice cooker maintains the warming temperature of 73 ℃ by the front heating.

On the other hand, when the switch 22A is switched to the second mode state, the switch 22A, like the bimetal 22C, closes the closed loop including the power supply unit 20, the cooking heat generating unit 26, and the heat sensing fuse 28. Form.

Then, the cooking diode display unit 26 is turned on by the bimetal 22C in the on state, and the heating plate 26B is heated to heat the inside of the thermal cooker.

The inside of the rice bowl of the rice cooker by the heating plate 26B is heated up to 100 ° C. after a predetermined time has elapsed, and the porridge is sown in the process.

In the bimetal 22C of the embodiment of the present invention, the turn-off temperature is set to 75 ° C ± 3 ° C, and the turn-on temperature is set to 50 ° C ± 3 ° C.

The bimetal 22C is boiled for about 5 minutes after reaching the dead 100 ° C, and after about 5 minutes after the kill reaches 100 ° C, the bimetal 22C is the preset turn-off temperature. 75 ° C. is detected, and thus the contact of the bimetal 22C is short-circuited, and the bamboo mode is converted to the warm mode.

At this time, in accordance with the conversion to the warming mode, the cooking diode display unit 26A is extinguished in the same manner as the warming mode described above, and the warming diode display unit 24C emits light. Then, the warming operation is performed in the same manner as in the warming mode described above.

After the heat mode is set, the temperature of the porridge lasts 100 ° C. due to the postheating until about 2 minutes has elapsed, and then gradually decreases to maintain 73 ° C., which is the warm mode setting temperature. Then, the temperature of the bimetal 22C falls in proportion to the degree to which the rice cooker falls.

As a result, referring to FIG. 3, the temperature of the porridge is changed as L1, and the sensing temperature of the bimetal 22C is changed as L2. In this case, the section A is a section in which the cooking diode display unit 26A emits light, and the porridge is sown at this time, and the section B is a section in which the insulating diode display section 24C emits light, at which time the pressed rice is insulated.

The embodiment according to the present invention can be used to warm or cook things, such as soup at a temperature lower than the cooking temperature in addition to the above-mentioned porridge picking function, and variously set the turn-off temperature and the turn-on temperature set in the bimetal according to the intention of the producer. By setting it, it can be used as a function of keeping warm of other foods that are weak to heat other than the station.

In addition, the embodiment according to the present invention has a considerably shorter time for pickling porridge than in the case of an electric rice cooker using a conventional microcomputer, and can use the porridge function even with a simple mechanical switch operation.

In addition, by implementing the porridge function with low-cost parts, the manufacturing cost of the product can be reduced, and the economic burden on the buyer can be minimized.

Therefore, according to the present invention, it is possible to reduce the manufacturing cost by implementing the porridge function with a low-cost device, to maximize the convenience of the user by the simple operation, the porridge function, cooking or warming function in the basic function of cooking and warming function of the rice cooker By providing various additional functions such as this, the user's satisfaction can be maximized.

Although the present invention has been described in detail only with respect to the embodiments described, it will be apparent to those skilled in the art that various modifications and changes are possible within the technical spirit of the present invention, and such modifications and modifications belong to the appended utility model claims. will be.

Claims (3)

In the electric rice cooker to cook and warm by heating the inner bowl by the electric current flows in the closed loop formed by the power source, the cooking heating unit and the heat generating unit, First switching means for switching to first and second mode states; A lever switch which is turned off when the first switching means is switched to a first mode state by forming a closed loop including the power source, the cooking heating unit, and the first switching means to heat the rice bowl, and to terminate the cooking temperature; And When the first switching means is switched to the second mode state, a closed loop including the power source, the cooking heating unit, and the first switching means is formed to heat the rice bowl and the temperature sensed as the rice bowl is heated is a predetermined value. A second switching means turned off if it is abnormal; Electric rice cooker characterized in that it comprises a. The method of claim 1, The second switching means is the electric rice cooker, characterized in that consisting of bimetal. The method according to claim 1 or 2, The second switching means is the electric rice cooker, characterized in that the turn-off temperature is set to 70 ℃ to 80 ℃, the turn on temperature is set to 45 ℃ to 55 ℃.