KR100186441B1 - Pressure varying method and apparatus of electric rice cooker - Google Patents

Abstract

The present invention relates to a pressure variable control method and apparatus of an electric pressure cooker, and in particular, by adjusting the heating temperature in accordance with the measurement of the internal temperature during cooking to adjust the pressure inside the cooker to the user desired menu By devising the pressure to the optimum pressure was created to perform cooking at the optimum pressure. The present invention comprises the steps of setting the pressure inside the cooker in the set pressure input unit 212, measuring the temperature inside the cooker with the upper and lower temperature sensors 205, 206, and the cooker at the temperature measured above Estimating the internal pressure and adjusting the internal pressure to a predetermined pressure by comparing the current pressure with the set pressure in the microcomputer 213 and turning on and off the heating operation according to the comparison result. do.

Description

Method and device for variable pressure control of electric pressure cooker

The present invention relates to an electric pressure cooker, and more particularly, to an apparatus and method for controlling a pressure of an electric pressure cooker to vary the pressure inside the cooker to cook a desired taste.

In general, pressure cookers include gas pressure cookers and electric pressure cookers.

First, the gas pressure cooker is manufactured to maintain the pressure inside the pot below a certain pressure by mechanically operating by additionally operating the steam when the pressure inside the cooker is a certain pressure or more than 2 atm or more when heated.

In addition, the electric pressure cooker has a product that operates on the same configuration and principle as a gas pressure cooker, and a product that employs a solenoid valve in the lid portion to discharge steam in the middle of the heating operation of the cooker.

1 is a block diagram of an embodiment showing a pressure regulating device employing a conventional pressure weight, and as shown therein, a signal stand 20 having a steam outlet 21 connected to a pressure vessel lid and a signal stand 20 are covered. Loss of signal comprises a weight (10).

Between the signal weight 101 and the signal stage 20 is configured to include a pressure control pipe 30 formed to adjust the diameter of the steam outlet 21.

The pressure control tube 30 is formed to be helically moved by meshing with a screw 22 of a predetermined length formed in the outer diameter of the center of the signal band 20.

The pressure control tube 30 is formed with a stop step 31 is formed in the upper end of the inner diameter to limit the movement of the upper and lower, and comprises a bending portion 32 bent inward in the lower end.

Referring to the operation of the conventional embodiment as follows.

The pressure control tube 30 connected between the signal board 20 and the signal weight 10 is moved upward or downward to enable cooking according to a user's taste, taste, or type of food.

At this time, the diameter of the steam outlet 21 of the signal zone 20 is adjusted by the pressure adjusting pipe 30 spirally moving upward or downward by the screw 22.

The pressure control pipe 30 is limited to the movement by the stop step 31 formed in the upper inner diameter when moving to the bottom, the movement is limited by the bending part 32 formed at one end of the lower portion.

In other words, depending on the type of cooking pressure inside the cooker is adjusted to one of two.

Accordingly, the pressure cooker is adjusted to maintain a predetermined pressure during cooking.

Thereafter, when cooking starts and the pressure inside the rice cooker rises to a predetermined pressure or more, the signal weight 10 is injured by the steam pressure discharged to the steam outlet 21, and the steam is discharged to the outside. The pressure is lowered below the predetermined predetermined pressure.

This operation is repeatedly performed while cooking is performed so that the pressure inside the cooker maintains a predetermined air pressure which is preset by the user.

Therefore, cooking according to the user's desired taste, taste, or type of food is possible.

However, this conventional technique has a disadvantage that it is not possible to perform the cooking by menu at the optimum pressure state because cooking is possible only with a limited air pressure.

Accordingly, the present invention is to adjust the pressure inside the cooker by adjusting the heating temperature in accordance with the measurement of the internal temperature during cooking to improve the disadvantages of the prior art to change the pressure for each menu desired by the user It is an object of the present invention to provide a pressure variable control device and method of an electric pressure cooker, which is designed to perform cooking at an optimum pressure.

1 is a block diagram showing an embodiment of the prior art.

2 is a cross-sectional view of the electric pressure cooker according to the present invention.

3 is a block diagram showing an embodiment according to the present invention.

4 is a timing diagram of the present invention.

5 is a signal flow diagram in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

200: body 201: lid

202: pressure fastening handle 203: pressure weight

204: valve driving unit 205: upper temperature sensor

206: lower temperature sensor 207: pressure sensor

208: inner container 209: sealing plate

210: solenoid valve 211: cooking key input unit

212: set pressure input unit 213: microcomputer

214: pressure display unit 215: heating control unit

216: temperature sensing unit 217: rice cooker

The present invention comprises the steps of setting the pressure inside the rice cooker to achieve the above object, estimating the temperature according to the pressure set in the above, measuring the temperature inside the cooker while cooking, and Estimating the pressure inside the cooker by comparing the measured temperature with the temperature according to the set pressure, and repeatedly adjusting the internal pressure to a predetermined pressure by varying the thermal power according to the comparison result.

In addition, the present invention provides a set pressure input means for setting the pressure in the cooker during cooking for each menu, cooking key input means for inputting cooking start, reservation, menu, and the internal temperature of the cooker to achieve the above object Temperature sensing means for calculating the temperature inside the cooker by inputting the upper and lower temperature sensors for sensing, the output signal of the upper and lower temperature sensors, and the temperature of the temperature sensing means when cooking is started by the cooking key input means. A system control means for comparing the temperature according to the data value and the input data of the set pressure input means to determine whether the pressure inside the cooker is optimal, and the pressure set by the set pressure input means by the control of the system control means. The pressure display means and the heating of the cooker when the system control means determines that the current pressure is higher than the set pressure. When smaller off by the heating control means to lower the pressure in the cooker, cooking is completed characterized in that the turns on the solenoid valve under the control of the system control means consists of a valve drive means for discharging the steam inside the cooker.

The system control means experimentally calculates and stores a temperature value inside the cooker according to the set pressure of the set pressure input means.

The solenoid valve is employed in the lid portion to perform the operation of discharging steam in the middle of cooking, but only serves to discharge the steam inside the cooker when switching to warming after the end of cooking.

The present invention can be configured by mounting a pressure sensor for directly measuring the pressure inside the cooker instead of mounting the upper, lower temperature sensor for measuring the temperature inside the cooker according to the set pressure.

Hereinafter, the present invention will be described in detail with reference to the drawings.

In the electric pressure cooker according to the present invention, as shown in the cross-sectional view of FIG. 2, a lid 201 that can be opened and closed on the main body 200 is mounted, and a pressure fastening handle 202 is mounted on an upper side of the lid 201. At the same time, the valve driving unit 204 is installed on the other side of the solenoid valve 210 to open and close the outlet by the pressure weight 203. The inner container 208 is inserted into the main body 200. Mounting the lower temperature sensor 206 to the outer lower end of the pressure sensor 207 to contact the inner lower end of the sealing plate 209 mounted on the lid 201 for sealing the inner container 208 and In addition, the upper temperature sensor 205 is mounted on the outer upper end of the sealing plate 209.

According to the embodiment of the present invention, as shown in the block diagram of FIG. 3, the set pressure input unit 212 for setting the internal pressure of the cooker 217 for each cooking menu, and the cooking key input unit for inputting cooking start, reservation, and menu 211, the upper and lower temperature sensors 205 and 206 for sensing the internal temperature of the cooker 217 and the output signals of the upper and lower temperature sensors 205 and 206 as inputs. A temperature sensor 216 for measuring the internal temperature of the 217, and when cooking is started by the cooking key input unit 211, the temperature data value of the temperature sensor 216 and the input of the set pressure input unit 212 The microcomputer 213 for comparing the temperature according to the data to determine whether the internal pressure of the rice cooker is optimal, and the pressure display unit for displaying the pressure set by the set pressure input unit 212 under the control of the microcomputer 213. 214 and the current pressure in the microcomputer 213 When it is determined that the pressure is higher than the set pressure, the heating control unit 215 for turning off the heating operation of the cooker to lower the internal pressure of the cooker 217 and, when cooking is finished, the solenoid valve 210 under the control of the microcomputer 213. The valve is configured to turn on the valve driving unit 204 to discharge steam from the inside of the cooker 217.

Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

When the user inputs a desired pressure to the set pressure input unit 212 for cooking by menu, the microcomputer 213 displays the pressure input from the set pressure input unit 212 on the screen of the pressure display unit 214.

Thereafter, when cooking is started with the cooking key input unit 211, the microcomputer 213 sets the temperature data for each pressure and the firepower ratio for each cooking process, which are internally set by an experiment.

Thereafter, the microcomputer 213 operates the heating control unit 215 to heat the cooker 217.

At this time, while heating the rice cooker 217, the microcomputer 213 reads the output values of the upper and lower temperature sensors 205 and 206 mounted inside the rice cooker 217 through the temperature sensing unit 216. This is compared with the temperature data value for the pressure set in.

The microcomputer 213 controls the operation of the heating control unit 215 by comparing the temperature data value according to the already set pressure and the upper and lower temperature values of the cooker 217 detected by the temperature sensing unit 216 during cooking. As a result, the rice cooker 217 is heated according to a process-specific cooking algorithm such as the timing of FIG. 4.

That is, the microcomputer 213 compares the temperature data value according to the initially set pressure with the upper and lower temperature values of the currently sensed cooker 217 and determines that the internal pressure of the cooker 217 is higher than the set pressure. The control unit 215 is controlled to turn off the heating operation.

Accordingly, the internal temperature of the cooker 217 is lowered to lower the internal pressure. Then, when the internal temperature of the cooker 217 is lower than the set temperature, the microcomputer 213 controls the heating control unit 215. The heating operation of the cooker 217 is resumed.

This operation is repeatedly performed as shown in the timing diagram of FIG.

Therefore, the microcomputer 213 advances the cooking process in the same manner as the timing diagram of FIG. 4 and drives the solenoid valve 210 through the valve driving unit 204 to switch to the warming process when the cooking is completed. This will completely remove the residual pressure inside.

The timing diagram of FIG. 4 for the cooking process as described above is as follows.

Curve (A) is a temperature curve detected by the upper temperature sensor 205 mounted to the cooker 217 for each cooking process, curve (B) is a temperature curve detected by the lower temperature sensor 206, curve (C) Is a pressure curve that controls the internal pressure of the cooker 217 by the thermal power and the sensed temperature.

In addition, the curve D is a heating curve in FIG.

In the timing diagram of FIG. 4, the boiling cutoff temperature T is set differently for each pressure, and the boiling section control thermal power ratio is also varied for each quantity and pressure to maintain the optimum pressure for each menu.

The above operation is performed in the same process as the signal flow of FIG.

First, the user inputs the internal pressure of the cooker 217 according to the menu in the set pressure input unit 212 for cooking.

At this time, the microcomputer 213 heats the rice cooker 217 through the heating control unit 215 to determine the amount of the menu by the time at which the temperature sensed by the upper temperature sensor 205 reaches a preset temperature.

In the above, the amount of the menu is previously set experimentally.

Thereafter, the microcomputer 213 measures the internal temperature of the cooker 217 by the upper and lower temperature sensors 205 and 206 through the temperature sensor 216.

At this time, the microcomputer 213 compares the temperature value detected by the upper and lower temperature sensors with the temperature data value corresponding to the pressure set by the set pressure input unit 212 and the current pressure inside the cooker 217 is greater than or equal to the set pressure. Will be judged.

Accordingly, when the present pressure is greater than the set pressure, the microcomputer 213 turns off the heating of the cooker 217 through the heating control unit 215.

Thereafter, when the current pressure inside the rice cooker 217 becomes smaller than the set pressure, the microcomputer 213 heats the rice cooker 217 again through the heating control unit 215.

This process is performed repeatedly as cooking is maintained to maintain the internal pressure of the cooker 217 at a predetermined pressure.

Thereafter, when the cooking is completed, the microcomputer 213 drives the solenoid valve 210 through the valve driving unit 204 to discharge the steam inside the cooker 217 to the outside and to switch to the warming process.

On the other hand, another embodiment of the present invention, as shown in the cross-sectional view of Figure 2, by attaching a pressure sensor to the inner upper portion of the sealing plate 209 through the pressure sensor 207 in the cooking microcomputer 213 through the pressure sensor 207 It is configured to directly detect the internal pressure of 217 to perform the cooking process.

Another embodiment of the present invention can control the cooking at the appropriate pressure for each menu. In another embodiment of the present invention, the microcomputer 213 may advance cooking in the same manner as the pressure curve C in the timing diagram of FIG.

As described in detail above, the present invention can vary the pressure for each menu, so that the user can provide satisfaction to the user by performing cooking in a desired state at the optimum pressure for each menu.

Claims (5)

In an electric pressure cooker equipped with a temperature sensor on the upper and lower sides of the inner container, the first step of setting the pressure inside the cooker, the second step of estimating the temperature according to the pressure set above, and cooking While the third step of measuring the temperature inside the cooker, and the fourth step of estimating the pressure inside the cooker by comparing the temperature according to the temperature and the set pressure measured in the above, and by varying the thermal power in accordance with the comparison result the internal pressure The variable pressure control method of the electric pressure cooker, characterized in that for repeating the fifth step of adjusting to a predetermined pressure. Set pressure input means for setting the pressure inside the cooking rice cooker for each menu, cooking key input means for inputting cooking start, reservation, and menu, upper and lower temperature sensors for detecting the internal temperature of the rice cooker, Temperature sensing means for calculating the temperature inside the cooker by inputting the output signal of the lower temperature sensor, and when cooking is started by the cooking key input means, the temperature data value of the temperature sensing means and input data of the set pressure input means. A system control means for determining whether the pressure inside the rice cooker is optimal by comparing the temperature according to the temperature, a pressure display means for displaying the pressure set in the set pressure input means by the control of the system control means, and the current in the system control means. If it is determined that the pressure is higher than the set pressure, reduce the pressure inside the cooker by turning on or off the heating operation of the cooker. When the control means, and cooking is completed the system control means controls turning on the solenoid valve control apparatus of the variable-pressure electric pressure cooker, it characterized in that the valve consists of a driving means for discharging the steam inside the cooker by the. The pressure variable control device of an electric pressure cooker according to claim 2, wherein the system control means experimentally calculates and stores a temperature value corresponding to the set pressure of the set pressure input means. The pressure variable control device of an electric pressure cooker according to claim 2, wherein the solenoid valve is operated only when switching from cooking to keeping warm. The pressure variable control device of an electric pressure cooker according to claim 2, wherein the upper and lower temperature sensors are replaced with a pressure sensor for directly measuring the pressure inside the rice cooker.