JP6967724B2 - Pressure type rice cooker - Google Patents

Description

The present invention relates to a pressure-type rice cooker that cooks rice by pressurizing the pressure in the pot to an atmospheric pressure or higher.

As a pressure type rice cooker of this kind, for example, the pressure type rice cooker described in Patent Document 1 is known. In the pressure type rice cooker of Patent Document 1, in the boiling maintenance step, after pressurizing the inside of the pot, the pressure valve is opened to communicate the pressurized pot and the atmosphere to reduce the pressure in the pot at once. And the rice grains are stirred in the pot.

Japanese Patent No. 3986467

However, in Patent Document 1, there is still room for improvement from the viewpoint of further improving the taste of cooked rice.

Therefore, an object of the present invention is to provide a pressure-type rice cooker capable of further improving the taste of cooked rice in solving the above-mentioned problems.

In order to achieve the above object, the pressure type rice cooker according to one aspect of the present invention is
With a pot,
A heating device that heats the pot and
The lid that closes the opening of the pot and
A pressure valve that opens and closes a steam discharge hole that communicates the inside of the pot with the lid.
A pressure valve moving mechanism that adjusts the pressure in the pot by moving the pressure valve between the closed position that closes the steam discharge hole and the open position that opens the steam discharge hole.
A pressure detection unit that detects the pressure inside the pot,
The Rice Information Acquisition Department, which acquires rice information,
A control unit that controls the heating device and the pressure valve moving mechanism to perform a rice cooking process including a boiling maintenance process.
Equipped with
The control unit sets either a first mode or a second mode based on the rice information acquired by the rice information acquisition unit, and when the first mode is set, the pot is used in the boiling maintenance step. When the pressure inside the pot is raised to the first target pressure and then lowered to the second mode, the pressure inside the pot is lowered to the second target pressure lower than the first target pressure in the boiling maintenance step. Raise it and then lower it.

According to the pressure type rice cooker according to the present invention, the taste of rice can be further improved.

FIG. 1 is a schematic cross-sectional view of a pressure-type rice cooker according to an embodiment of the present invention. FIG. 2 is a perspective view of the pressure-type rice cooker of FIG. FIG. 3 is a plan view showing a state in which the parts on the upper outer shell member side of the outer lid are removed from the pressure type rice cooker of FIG. FIG. 4 is a schematic cross-sectional view showing the arrangement of the steam supply unit in the pressure type rice cooker of FIG. FIG. 5 is a partially cutaway side view of the pressure-type rice cooker of FIG. FIG. 6 is a graph showing changes in the temperature and pressure in the pot when an example of the rice cooking process is performed using the pressure type rice cooker of FIG. 1. 7, Ru graph der showing changes in the temperature and pressure inside the pot in the boiling maintain process pressure type rice cooker according to the embodiment of the present invention. FIG. 8 is a graph showing changes in the temperature and pressure in the pot in the additional cooking step of the pressure-type rice cooker according to the embodiment of the present invention. FIG. 9 is a graph showing the relationship between the temperature and the pressure in the pot of the pressure-type rice cooker according to the embodiment of the present invention.

(Findings underlying this disclosure)
The present inventors have obtained the following new findings as a result of diligent studies in order to further improve the taste of cooked rice.

In the conventional pressure type rice cooker, in the boiling maintenance step, the pressure in the pot is raised to the atmospheric pressure or higher, and then the pressure valve is opened to stir the rice in the pot. As a result, the temperature inside the pot is made uniform and uneven cooking is reduced. In addition, increasing the pressure inside the pot promotes the gelatinization of rice.

In addition, in the additional cooking process, the pressure valve is closed and steam is supplied to the pot to prevent the water from evaporating too much, while increasing the pressure in the pot to promote the gelatinization of rice. ..

However, in the case of soft rice such as Koshihikari from Uonuma or rice with easy gelatinization such as new rice, if the pressure in the pot is increased too much, the gelatinization becomes excessive and the cooked rice tends to become sticky. .. That is, the stickiness of the rice increases. In addition, by stirring the inside of the pot, the rice rubs against each other, further increasing the stickiness.

Therefore, the present inventors have found a configuration in which the pressure in the pot is controlled according to the quality of rice. With this configuration, the stickiness of the rice can be suppressed and the taste of the rice can be further improved. Based on this novel finding, the present inventors have reached the following inventions.

The pressure-type rice cooker according to the first aspect of the present invention is
With a pot,
A heating device that heats the pot and
The lid that closes the opening of the pot and
A pressure valve that opens and closes a steam discharge hole that communicates the inside of the pot with the lid.
A pressure valve moving mechanism that adjusts the pressure in the pot by moving the pressure valve between the closed position that closes the steam discharge hole and the open position that opens the steam discharge hole.
A pressure detection unit that detects the pressure inside the pot,
The Rice Information Acquisition Department, which acquires rice information,
A control unit that controls the heating device and the pressure valve moving mechanism to perform a rice cooking process including a boiling maintenance process.
Equipped with
The control unit sets either a first mode or a second mode based on the rice information acquired by the rice information acquisition unit, and when the first mode is set, the pot is used in the boiling maintenance step. When the pressure inside the pot is raised to the first target pressure and then lowered to the second mode, the pressure inside the pot is lowered to the second target pressure lower than the first target pressure in the boiling maintenance step. Raise it and then lower it.

In the pressure type rice cooker of the second aspect of the present invention, the control unit raises the pressure in the pot to the first target pressure in the first mode, and then raises the pressure in the pot to the first. 1 The target pressure may be maintained.

In the pressure type rice cooker of the third aspect of the present invention, the control unit is
In the first mode, a pressure change in which the pressure in the pot is raised to the target pressure and then lowered is generated a plurality of times.
In the initial stage of the boiling maintenance step, the pressure in the pot is raised to the first target pressure and then lowered to generate the first pressure change.
The target pressure in the pressure change after the second time may be lower than the first target pressure.

In the pressure type rice cooker of the fourth aspect of the present invention, the control unit is
In the second mode, a pressure change in which the pressure in the pot is raised to the target pressure and then lowered is generated a plurality of times.
In the initial stage of the boiling maintenance step, the pressure in the pot is raised to the second target pressure and then lowered to generate the first pressure change.
The target pressure in the pressure change after the second time may be lower than the second target pressure.

The pressure-type rice cooker according to the fifth aspect of the present invention includes a steam supply unit that supplies steam into the pot.
The control unit controls the heating device, the pressure valve moving mechanism, and the steam supply unit to perform a re-cooking step. In the re-cooking step, the rice information acquired by the rice information acquisition unit and the rice information are described. The steam supply unit may be controlled based on the pressure in the pot detected by the pressure detection unit.

In the pressure-type rice cooker according to the sixth aspect of the present invention, the control unit sets one of the third mode and the fourth mode based on the rice information, and when the third mode is set, the said In the re-cooking step, when the amount of steam supplied from the steam supply unit into the pot is controlled to keep the pressure in the pot at the third target pressure and the fourth mode is set, the re-cooking step In, the pressure in the pot may be held at the fourth target pressure smaller than the third target pressure.

In the pressure-type rice cooker according to the seventh aspect of the present invention, the rice information may include information on at least one of new rice, old rice, and brand.

In the pressure-type rice cooker according to the eighth aspect of the present invention, the rice information acquisition unit may acquire the rice information by input by the user.

In the pressure-type rice cooker according to the ninth aspect of the present invention,
It is equipped with a pot temperature detector that detects the temperature inside the pot.
The pressure detecting unit may estimate the pressure in the pot based on the temperature in the pot detected by the pot temperature detecting unit.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Further, in each figure, each element is exaggerated for the sake of easy explanation.

(Embodiment)
[overall structure]
A pressure-type rice cooker, which is an example of the pressure-type cooker according to the embodiment of the present invention, will be described. FIG. 1 is a schematic cross-sectional view of a pressure-type rice cooker according to an embodiment of the present invention. FIG. 2 is a perspective view of the pressure-type rice cooker of FIG.

As shown in FIG. 1, the pressure-type rice cooker according to the present embodiment is stored in a substantially bottomed tubular rice cooker main body 1 having a pot storage portion 1a formed therein and a pot storage portion 1a, and rice. It is equipped with a pot 2 that can hold food such as rice and water. An outer lid 3 having a hollow structure capable of opening and closing the upper opening of the rice cooker main body 1 is attached to the upper portion of the rice cooker main body 1. A substantially disk-shaped inner lid 4 that can seal the upper opening of the pot 2 is detachably attached to the inside of the outer lid 3 (the side that covers the upper opening of the pot 2). In the present embodiment, the outer lid 3 and the inner lid 4 form a lid that can open and close the upper opening of the pot 2.

The pot storage portion 1a of the rice cooker main body 1 is composed of an upper frame 1b and a coil base 1c. The upper frame 1b has a tubular portion 1ba arranged so as to have a predetermined gap with respect to the side wall of the stored pot 2, and an upper opening portion of the rice cooker main body 1 protruding outward from the upper portion of the tubular portion 1ba. It is provided with a flange portion 1bb that fits into the inner peripheral portion of the rice cooker. The upper end of the tubular portion 1ba supports the flange portion 2a provided around the upper opening of the pot 2.

The coil base 1c is formed in a bottomed cylindrical shape corresponding to the shape of the lower portion of the pan 2, and the upper portion thereof is attached to the lower end portion of the tubular portion 1ba of the upper frame 1b. A pot bottom heating unit 5, which is an example of a pot heating device for heating (induction heating) the pot 2, is attached to the outer peripheral surface of the coil base 1c. The pot bottom heating unit 5 is composed of an in-bottom heating coil 5a and an out-of-bottom heating coil 5b. The in-bottom heating coil 5a is arranged so as to face the periphery of the central portion of the bottom of the pot 2 via the coil base 1c. The outer bottom heating coil 5b is arranged so as to face the corner portion of the bottom portion of the pan 2 via the coil base 1c.

An opening is provided in the central portion of the bottom of the coil base 1c. In the opening, a pot temperature sensor 6, which is an example of a pot temperature detecting unit for measuring the temperature of the pot 2, is arranged so as to be in contact with the bottom of the pot 2 housed in the pot storage unit 1a. .. Since the temperature of the pot 2 is substantially the same as the temperature of the object to be cooked in the pot 2, the pot temperature sensor 6 can detect the temperature of the object to be cooked in the pot 2 by detecting the temperature of the pot 2. can.

The outer lid 3 includes an upper outer shell member 3a and a lower outer shell member 3b that constitute the outer shell of the outer lid 3. Further, the outer lid 3 includes a hinge shaft 3A. The hinge shaft 3A is an opening / closing shaft of the outer lid 3, and both ends thereof are rotatably fixed to the upper frame 1b of the rice cooker main body 1. A torsion coil spring 7 is attached around the hinge shaft 3A. The torsion coil spring 7 elastically urges the outer lid 3 in the direction away from the upper opening of the pot 2 (opening direction) with the hinge shaft 3A as the center.

A lid opening device 8 is provided inside the outer lid 3. The lid opening device 8 keeps the state in which the outer lid 3 closes the upper opening of the pot 2 by engaging with a part of the rice cooker main body 1. On the other hand, in the lid opening device 8, when the lid opening button 81 (see FIG. 2) provided on the rice cooker main body 1 or the outer lid 3 is pressed while the outer lid 3 closes the upper opening of the pot 2. It rotates in the direction of arrow A1 around the hook shaft 8A. As a result, the lid opening device 8 and a part of the rice cooker main body 1 are disengaged, and the outer lid 3 is separated from the upper opening of the pot 2 about the hinge shaft 3A by the urging force of the torsion coil spring 7. Rotate to. As a result, the outer lid 3 is in an open state that does not block the upper opening of the pot 2. The outer lid 3 is configured to stop the rotation when, for example, the outer lid 3 is rotated 90 degrees around the hinge shaft 3A from a position where the upper opening of the pot 2 is closed.

A recess 3d is provided in the vicinity of the hinge shaft 3A of the upper outer member 3a. A steam cylinder 9 is detachably attached to the recess 3d. At the bottom of the recess 3d, a steam escape hole 3da is provided so that excess steam in the pot 2 can be discharged toward the steam cylinder 9. The upper wall of the steam cylinder 9 is provided with a steam relief hole 9a so that excess steam in the pot 2 can be discharged to the outside of the rice cooker.

The inner lid 4 is provided with a steam discharge hole 4a for discharging the steam in the pot 2 and a steam discharge hole 4b. The diameter of the steam discharge hole 4b is larger than the diameter of the steam discharge hole 4a, and is set to be, for example, twice or more the diameter of the steam discharge hole 4a. The diameter of the steam discharge hole 4a is, for example, 4 mm, and the diameter of the steam discharge hole 4b is, for example, 10 mm.

Further, the inner lid 4 is provided with a pressure suppression valve 10 capable of opening and closing the steam discharge hole 4a and a pressure valve 11 capable of opening and closing the steam discharge hole 4b.

The pressure suppression valve 10 is a valve that suppresses the pressure in the pan 2 from rising above a predetermined value (for example, 1.2 atm) higher than the atmospheric pressure. In the present embodiment, the pressure suppression valve 10 is composed of balls and closes the steam discharge hole 4a by its own weight. On the other hand, when the pressure in the pot 2 becomes larger than its own weight (for example, when it becomes 1.2 atm or more), the pressure suppression valve 10 is pushed only by the pressure in the pot 2 and is pushed from the steam discharge hole 4a. Separate and open the steam discharge hole 4a.

The pressure valve 11 is configured to move to a closed position for closing the steam discharge hole 4b and an open position for opening the steam discharge hole 4b by the pressure valve moving mechanism 12. For example, the pressure valve moving mechanism 12 may move the pressure valve 11 to the closed position and the open position by the cam mechanism. The pressure valve 11 may be moved up and down by contacting the end portion of the pressure valve 11 and horizontally moving the plate material whose tip protrudes toward the pressure valve 11 by the gear mechanism. The pressure valve moving mechanism 12 is not limited to the cam mechanism, and may be any mechanism that can move the pressure valve 11 to the closed position and the open position.

The outer lid 3 is provided with a pressure valve moving mechanism 12 for moving the pressure valve 11 so as to open and close the steam discharge hole 4b. The pressure valve moving mechanism 12 is configured to press the pressure valve 11 with a pressure larger than a predetermined value (for example, 1.2 atm) to hold the pressure valve 11 in the closed position. Further, the pressure valve moving mechanism 12 controls the pressure valve 11 from the closed position by the control of the control unit 14 described later at a predetermined timing when the pressure in the pan 2 becomes a predetermined value (for example, 1.2 atm) or more. It is configured to move to the open position. As a result, the pressure in the pot 2 can be reduced at once (for example, reduced from 1.2 atm to 1.0 atm) to cause the water in the pot 2 to boil and the rice grains in the pot 2 to be agitated.

Further, the pressure valve moving mechanism 12 can adjust the pressure in the pot 2 by moving the pressure valve 11 based on the pressure in the pot 2 detected by the pressure sensor unit described later.

Various information such as rice cooking course and rice cooking time is displayed on the outer lid 3, and a specific rice cooking course can be selected from a plurality of rice cooking courses such as white rice course, brown rice course, and white rice (soft) course. An operation unit 13 is provided. The display operation unit 13 includes a liquid crystal display 13A that displays various information such as a rice cooking course and a rice cooking time, and a plurality of buttons 13B that instruct the execution of rice cooking start, cancellation, reservation, etc. in addition to the selection of the rice cooking course. ing. The user can select a specific rice cooking course and instruct the start of rice cooking by using the plurality of buttons 13B while referring to various information displayed on the liquid crystal display 13A.

Further, the liquid crystal display 13A can display information on rice such as new rice, old rice, and brand. For example, the user can operate a plurality of buttons 13B to select rice information according to the quality of rice to be cooked from the rice information displayed on the liquid crystal display 13A. That is, the display operation unit 13 functions as a rice information acquisition unit that acquires information on rice related to rice quality such as new rice, old rice, and brands. As described above, in the present embodiment, the rice information acquisition unit acquires the rice information by the input of the user.

A control unit 14 is mounted inside the rice cooker main body 1. The control unit 14 includes a storage unit that stores a plurality of rice cooking sequences for cooking rice. Here, in the "rice cooking sequence", when the four main steps of preheating, raising the temperature, maintaining boiling, and steaming are performed in order, the energization time, heating temperature, heating time, heating output, etc. are predetermined in each step. The procedure for cooking rice. Each rice cooking sequence corresponds to one of a plurality of rice cooking courses. The control unit 14 controls the pot bottom heating unit 5 and the pressure valve moving mechanism 12 based on the rice cooking course selected by the display operation unit 13 and the detection temperature of the pot temperature sensor 6, and executes the rice cooking process.

Further, the control unit 14 controls the pressure valve moving mechanism 12 based on the rice information set by the display operation unit 13 and the pressure in the pot 2 detected by the pressure sensor unit described later, and the pot 2 is used. Adjust the pressure inside. In the present embodiment, the control unit 14 adjusts the pressure in the pot 2 according to the rice quality in the boiling maintenance step.

FIG. 3 is a plan view showing a state in which the parts on the upper outer shell member 3a side of the outer lid 3 are removed from the pressure type rice cooker of FIG. As shown in FIG. 3, inside the outer lid 3, a steam supply unit 15 for supplying steam into the pot 2 is provided. In the present embodiment, the steam supply unit 15 is configured to supply superheated steam exceeding 100 degrees as steam into the pot 2. The steam supply unit 15 is attached to the lower outer shell member 3b of the outer lid 3 by a fastening member such as a screw. The steam introduction pipe 16 and the steam discharge pipe 17 are connected to the steam supply unit 15.

FIG. 4 is a schematic cross-sectional view showing the arrangement of the steam supply unit 15 in the pressure type rice cooker of FIG. As shown in FIG. 4, the steam supply unit 15 is connected to the water tank 18 via the steam introduction pipe 16. The water tank 18 is a bottomed cylindrical container that holds water for generating steam. The water tank 18 is housed in the water tank storage unit 1bc. A water tank heating coil 19 for heating (induction heating) the water tank 18 is attached to the outer peripheral surface of the water tank storage portion 1bc. When the water tank heating coil 19 heats the water tank 18, the water in the water tank 18 boils, and steam at about 100 ° C. is generated. The steam generated in the water tank 18 is supplied to the steam supply unit 15 through the steam introduction pipe 16. The steam supply unit 15 has a heating coil and further heats the steam supplied from the steam introduction pipe 16. In the present embodiment, the steam heater is composed of the steam supply unit 15 and the water tank heating coil 19.

The steam introduction pipe 16 is provided so as to communicate with the inside of the water tank 18 when the lid is in the closed state and to guide the steam generated in the water tank 18 to the steam supply unit 15. The steam supply unit 15 superheats the steam introduced from the water tank 18 through the steam introduction pipe 16 to make superheated steam, and supplies the superheated steam into the pot 2 through the steam discharge pipe 17.

The steam discharge pipe 17 communicates with the inside of the pot 2 through the steam supply hole 4c provided in the inner lid 4 when the lid is in the closed state, and guides the steam generated by the steam supply unit 15 into the pot 2. It is provided in. An annular packing is attached to the end of the steam discharge pipe 17 on the pot 2 side. The packing is provided so as to be in close contact with the periphery of the steam supply hole 4c of the inner lid 4 when the lid is in the closed state. Since the specific configuration of the steam supply unit 15 is the same as the configuration of the conventional steam supply unit, the description thereof will be omitted here.

FIG. 5 is a partially cutaway side view of the pressure-type rice cooker of FIG. As shown in FIG. 5, the outer lid 3 has a built-in pressure sensor unit 21 as an example of a pressure detecting unit that detects the pressure in the pot 2. More specifically, the pressure sensor unit 21 is attached to the lower outer member 3b of the outer lid 3.

As shown in FIG. 3, the lower outer shell member 3b of the outer lid 3 is provided with a through hole 3c at the mounting position of the pressure sensor unit 21. The inner lid 4 is provided with a through hole 4d at a position facing the through hole 3c when the inner lid 4 is attached to the lower outer shell member 3b of the outer lid 3.

[motion]
The operation of the pressure type rice cooker according to the present embodiment will be described. FIG. 6 is a graph showing the temperature in the pot 2 and the pressure in the pot 2 when an example of the rice cooking process is performed using the pressure type rice cooker according to the present embodiment. Further, FIG. 6 shows the relationship between the open / closed state of the pressure valve 11, the operating state of the steam heater, and the operating state of the heating device 5 in the rice cooking process of old rice. The pressure value shown in FIG. 6 indicates a pressure value pressurized with the atmospheric pressure as a reference (0 kPa).

First, the user sets the pot 2 in which the food to be cooked containing rice and water, which is the food to be cooked, is placed in the pot storage unit 1a. After that, after the rice information is set by the display operation unit 13 and the rice cooking course is selected by the user, when the rice cooking start is instructed, the rice cooking process is started under the control of the control unit 14. When the rice cooking process is started, the preheating process is first started.

The preheating step is a step of immersing the rice in water having a temperature lower than the gelatinization temperature and allowing the rice to absorb water in advance so that the central part of the rice can be sufficiently gelatinized in the subsequent steps. In this preheating step, the control unit 14 raises the temperature of the water in the pot 2 to near the temperature at which the gelatinization of rice starts (about 50 ° C.), and then maintains the temperature after the temperature rise. The pot heating operation of the pot bottom heating unit 5 is controlled based on the detection temperature of the pot temperature sensor 6. Further, the control unit 14 controls the pressure valve moving mechanism 12 so that the pressure valve 11 is held in the open position during the preheating step. When a preset time has elapsed from the start of the preheating step according to the selected rice cooking course, the process shifts to the heating step.

The temperature raising step is a step of heating the pot 2 at once with high heat to bring the water in the pot 2 to a boiling state. In this temperature raising step, the control unit 14 controls the pot bottom heating unit 5 so as to rapidly heat the pot 2 to bring the water in the pot 2 to a boiling state. Further, the control unit 14 controls the pressure valve moving mechanism 12 so that the pressure valve 11 is held in the open position during the temperature raising step. When the detection temperature of the pot temperature sensor 6 reaches the boiling point (about 100 ° C.) of the water in the pot 2 by the implementation of the temperature raising step, the process shifts to the boiling maintenance step.

The boiling maintenance step is a step of maintaining the boiling state of the water in the pot 2 to gelatinize the starch of rice and raise the degree of gelatinization to about 50% to 80%. In this boiling maintenance step, the control unit 14 controls the pot bottom heating unit 5 and the pressure valve moving mechanism 12 so as to maintain the boiling state of the water in the pot 2.

At the initial stage of the boiling maintenance step, as shown in FIG. 6, the control unit 14 keeps the pressure valve 11 in the closed position by the pressure valve moving mechanism 12 to raise the pressure in the pot 2 to the target pressure. I do. After that, the control unit 14 moves the pressure valve 11 to the open position by the pressure valve moving mechanism 12, and rapidly lowers the pressure in the pan 2 to the atmospheric pressure. The target pressure is determined by the control unit 14 based on the rice information acquired by the display operation unit 13 (rice information acquisition unit). The control unit 14 determines the target pressure in the range of, for example, 5 kPa or more and 20 kPa or less.

As described above, when the process shifts to the boiling maintenance step, the control unit 14 immediately controls the pressure valve moving mechanism 12 and controls the pressure valve 11. This is because immediately after entering the boiling maintenance step, the amount of residual water in the pot 2 is large, and the larger the amount of residual water, the easier it is for the rice grains to be agitated and moved in the pot 2. Since the amount of residual water decreases with the passage of time, by controlling the pressure valve 11 at the beginning of the boiling maintenance step where the amount of residual water is large, a sudden pressure change is generated in the pot 2 and the rice grains are agitated more violently. ing.

Further, as shown in FIG. 6, the control unit 14 raises the pressure in the pot 2 to the target pressure after the first pressure change in the initial stage of the boiling maintenance step, that is, in the initial stage of the boiling maintenance step, and then the atmospheric pressure. After the pressure is rapidly lowered to, the pressure valve 11 is opened and closed a plurality of times to change the pressure in the pot 2 a plurality of times. In other words, in the boiling maintenance step, the control unit 14 generates a rapid pressure change a plurality of times in which the pressure in the pot 2 is raised to the target pressure and then lowered to the atmospheric pressure. With such control, the rice grains in the underheated region can be agitated. As a result, the heated state can be averaged, so that the upper surface of the cooked rice can be flattened.

Further, the control unit 14 sets the width of the pressure change after the second time to be smaller than the width of the pressure change of the first time in the initial stage of the boiling maintenance step. That is, the control unit 14 makes the target pressure in the second and subsequent pressure changes lower than the target pressure in the first pressure change in the initial stage of the boiling maintenance step.

In the present embodiment, the target pressure in the second and subsequent pressure changes is set to ½ of the target pressure in the first pressure change.

Stirring energy is proportional to pressure. As the boiling maintenance process progresses, the rice becomes softer and the amount of water in the pot 2 decreases. Therefore, while it is desired to heat the rice so as to eliminate uneven cooking, if the pressure in the pot 2 is increased too much, the stickiness of the rice will increase. Therefore, by making the target pressure in the second and subsequent pressure changes lower than the target pressure in the first pressure change, it is possible to suppress the increase in the stickiness of the rice.

In the present embodiment, the control unit 14 adjusts the pressure in the pot 2 in the boiling maintenance step based on the rice information. Specifically, the control unit 14 sets either the first mode or the second mode based on the rice information set by the display operation unit 13. For example, the first mode is a mode for cooking rice having a rice quality that is difficult to gelatinize, such as old rice or hard rice, in the boiling maintenance step. The second mode is a mode in which rice having a rice quality that is easily gelatinized, such as new rice or soft rice, is cooked in the boiling maintenance step, and the rice is cooked at a lower pressure than in the first mode. In the present embodiment, an example in which old rice is cooked as a first mode and new rice is cooked as a second mode in the boiling maintenance step will be described.

FIG. 7 is a graph showing changes in the temperature and pressure in the pot 2 in the boiling maintenance step of the pressure-type rice cooker according to the present embodiment. FIG. 7 shows the transition of the temperature and pressure in the pot 2 when cooking old rice in the first mode and the transition of the temperature and pressure in the pot 2 when cooking new rice in the second mode.

<First mode>
First, the first mode will be described. At the initial stage of the boiling maintenance step, the control unit 14 moves the pressure valve 11 from the open position to the closed position by the pressure valve moving mechanism 12, and raises the pressure in the pot 2 to the first target pressure Pt1. In the present embodiment, the first target pressure Pt1 is, for example, 20 kPa. As a result, the boiling point of the water in the pot 2 rises to about 105 ° C.

When the pressure in the pot 2 rises to the first target pressure Pt1, the control unit 14 controls the pressure valve moving mechanism 12 to perform a pressure adjusting step of holding the pressure in the pot 2 at the first target pressure Pt1. In this pressure adjustment step, the control unit 14 changes the operating speed of the pressure valve moving mechanism 12 based on whether or not the difference between the pressure value detected by the pressure sensor unit 21 and the first target pressure Pt1 is smaller than the threshold value. Let me. By maintaining the pressure in the pot 2 at the first target pressure Pt1 in this way, the gelatinization of the rice in the pot 2 can be promoted.

After the pressure in the pot 2 is held by the first target pressure Pt1, the control unit 14 suddenly reduces the pressure in the pot 2 to 0 kPa (by moving the pressure valve 11 to the open position by the pressure valve moving mechanism 12). Atmospheric pressure). The time for holding the pressure in the pot 2 at the first target pressure Pt1 is set to a predetermined time based on the information of the selected rice cooking course and / or rice.

As described above, in the initial stage of the boiling maintenance step, the rice grains can be vigorously agitated by rapidly lowering the pressure in the pot 2 from the first target pressure Pt1 to the atmospheric pressure.

Further, in the first mode, the control unit 14 generates a pressure change in which the pressure in the pot 2 is raised to the target pressure and then lowered a plurality of times. In the first mode, the control unit 14 generates the first pressure change in which the pressure in the pot 2 is raised to the first target pressure Pt1 and then lowered in the initial stage of the boiling maintenance step, and the pressure change after the second time is generated. The target pressure in the above is lower than the first target pressure Pt1. That is, in the first mode, the width of the pressure change after the second time is smaller than the width of the pressure change of the first time.

Specifically, in the first pressure change in the initial stage of the boiling maintenance step, the control unit 14 raises the pressure in the pot 2 to the first target pressure Pt1 and then sharply lowers it to the atmospheric pressure (0 kPa). There is. On the other hand, in the second and subsequent pressure changes, the control unit 14 raises the pressure in the pot 2 to a target pressure lower than the first target pressure Pt1 and then sharply lowers it to the atmospheric pressure (0 kPa).

<Second mode>
Next, the second mode will be described. At the initial stage of the boiling maintenance step, the control unit 14 moves the pressure valve 11 from the open position to the closed position by the pressure valve moving mechanism 12, and raises the pressure in the pot 2 to the second target pressure Pt2. The second target pressure Pt2 is set lower than the first target pressure Pt1. In the present embodiment, the second target pressure Pt2 is, for example, 8 kPa.

When the pressure in the pot 2 rises to the second target pressure Pt2, the control unit 14 moves the pressure valve 11 to the open position by the pressure valve moving mechanism 12 to reduce the pressure in the pot 2 to 0 kPa (atmospheric pressure). Lower. As described above, in the second mode, the pressure in the pot 2 is increased to the second target pressure Pt2, which is lower than the first target pressure Pt1, and then rapidly decreased to the atmospheric pressure.

In this way, in the initial stage of the boiling maintenance step, the pressure in the pot 2 is sharply lowered from the second target pressure Pt2, which is lower than the first target pressure Pt1, to the atmospheric pressure, thereby suppressing the stirring effect of rice as compared with the first mode. be able to. As a result, it is possible to suppress the stickiness of rice having a rice quality that is easily gelatinized.

Further, in the second mode, the control unit 14 generates a pressure change in which the pressure in the pot 2 is raised to the target pressure and then lowered a plurality of times. In the second mode, the control unit 14 generates the first pressure change in which the pressure in the pot 2 is raised to the second target pressure Pt2 and then lowered in the initial stage of the boiling maintenance step, and the pressure change after the second time is generated. The target pressure in the above is lower than the second target pressure Pt2. That is, in the second mode, the width of the pressure change after the second time is smaller than the width of the pressure change of the first time.

Specifically, in the first pressure change in the initial stage of the boiling maintenance step, the control unit 14 raises the pressure in the pot 2 to the second target pressure Pt2 and then sharply lowers it to the atmospheric pressure (0 kPa). There is. On the other hand, in the second and subsequent pressure changes, the control unit 14 raises the pressure in the pot 2 to a target pressure lower than the second target pressure Pt2, and then sharply lowers the pressure to atmospheric pressure (0 kPa).

Returning to FIG. 6, in the boiling maintenance step, water is continuously boiled, so that a large amount of steam is generated. This steam passes through the steam discharge holes 4a, the steam discharge holes 4b, the steam relief holes 3da, 9a, etc., and is discharged to the outside of the rice cooker. As a result, when most of the water in the pot 2 is exhausted, the temperature of the bottom surface of the pot 2 rises above the boiling point of the water. When the detection temperature of the pot temperature sensor 6 reaches a predetermined temperature equal to or higher than the boiling point (for example, 130 ° C.), the process proceeds to the steaming step.

The steaming step is a step of evaporating excess water using preheating to raise the degree of gelatinization of rice to nearly 100%. In this steaming step, the control unit 14 controls the pot bottom heating unit 5 to heat the pot 2 and control the steam supply unit 15 every time the temperature of the pot 2 drops below a certain temperature (for example, 100 ° C.). The additional cooking process of supplying steam into the pot 2 is executed. The additional cooking process means the initial process of the steaming process.

In the reheating step, the control unit 14 controls the pressure valve moving mechanism 12 to close the steam discharge hole 4b with the pressure valve 11. Further, the control unit 14 controls the steam supply unit 15 to supply steam into the pot 2. Specifically, the control unit 14 controls the water tank heating coil 19 to boil the water in the water tank 18 and generate steam. Further, the control unit 14 controls the steam supply unit 15 to superheat the steam introduced into the steam supply unit 15 through the steam introduction pipe 16, and the pot 2 through the steam discharge pipe 17 and the steam supply hole 4c of the inner lid 4. It is supplied as superheated steam inside. In other words, the control unit 14 supplies steam into the pot 2 by increasing the heating power of the steam heater composed of the steam supply unit 15 and the heating coil 19.

In the additional cooking process, the control unit 14 determines the target pressure in the pot 2 according to the rice information. The control unit 14 adjusts the amount of steam supplied from the steam supply unit 15 into the pot 2 so that the pressure in the pot 2 becomes the target pressure. Specifically, the control unit 14 adjusts the amount of steam supplied from the steam supply unit 15 into the pot 2 by adjusting the heating power of the steam heater.

Specifically, the control unit 14 sets either the third mode or the fourth mode based on the rice information set by the display operation unit 13. For example, the third mode is a mode for cooking rice having a rice quality that is difficult to gelatinize, such as old rice or hard rice, in the additional cooking step. The fourth mode is a mode in which rice having a rice quality that is easily gelatinized, such as new rice or soft rice, is cooked in the additional cooking step, and the rice is cooked at a lower pressure than in the third mode. In the present embodiment, an example in which old rice is cooked as the third mode and new rice is cooked as the fourth mode in the additional cooking step will be described.

FIG. 8 is a graph showing changes in the temperature and pressure in the pot 2 in the additional cooking step of the pressure-type rice cooker according to the present embodiment. FIG. 8 shows the transition of the temperature and pressure in the pot 2 when cooking old rice in the first mode and the transition of the temperature and pressure in the pot 2 when cooking new rice in the second mode.

<Third mode>
First, the third mode will be described. In the reheating step, the control unit 14 moves the pressure valve 11 from the open position to the closed position by the pressure valve moving mechanism 12. Further, the control unit 14 controls the steam supply unit 15 to supply steam into the pot 2. Specifically, the control unit 14 supplies steam from the steam supply unit 15 into the pot 2 by increasing the thermal power of the steam heater. When steam is supplied into the pot 2, the pressure inside the pot 2 rises.

The control unit 14 holds the pressure in the pot 2 at the third target pressure Pt3 in the additional cooking step. Specifically, when the additional cooking process is started, the control unit 14 raises the heating power of the steam heater to supply steam from the steam supply unit 15 into the pot 2. When the pressure in the pot 2 rises due to the steam and exceeds the third target pressure Pt3, the control unit 14 adjusts to lower the heating power of the steam heater. As a result, the amount of steam supplied from the steam supply unit 15 into the pot 2 is reduced, and the pressure in the pot 2 that has risen beyond the third target pressure Pt3 is lowered. When the pressure in the pot 2 falls below the third target pressure Pt3, the control unit 14 raises the heating power of the steam heater to increase the amount of steam supplied from the steam supply unit 15 into the pot 2. As a result, the pressure in the pot 2 is increased. In this way, the control unit 14 adjusts the heating power of the steam heater so that the pressure in the pot 2 is held at the third target pressure Pt3 in the additional cooking step.

In the present embodiment, for example, the third target pressure Pt3 is 8 kPa, and the pressure in the pot 2 is maintained in the range of ± 2 kPa from the third target pressure Pt3. In the third mode, the temperature in the pot 2 in the additional cooking step changes in the range of about 101 ° C to 103 ° C.

<4th mode>
The fourth mode will be described. In the reheating step, the control unit 14 moves the pressure valve 11 from the open position to the closed position by the pressure valve moving mechanism 12. The steam supply unit 15 is controlled to supply steam into the pot 2. Specifically, the control unit 14 supplies steam from the steam supply unit 15 into the pot 2 by increasing the thermal power of the steam heater. When steam is supplied into the pot 2, the pressure inside the pot 2 rises.

The control unit 14 holds the pressure in the pot 2 at the fourth target pressure Pt4, which is lower than the third target pressure Pt3, in the additional cooking step. Specifically, when the additional cooking process is started, the control unit 14 raises the heating power of the steam heater to supply steam from the steam supply unit 15 into the pot 2. When the pressure in the pot 2 rises due to the steam and exceeds the fourth target pressure Pt4, the control unit 14 adjusts to lower the heating power of the steam heater. As a result, the amount of steam supplied from the steam supply unit 15 into the pot 2 is reduced, and the pressure in the pot 2 that has risen beyond the fourth target pressure Pt4 is lowered. When the pressure in the pot 2 falls below the fourth target pressure Pt4, the control unit 14 raises the heating power of the steam heater to increase the amount of steam supplied from the steam supply unit 15 into the pot 2. As a result, the pressure in the pot 2 is increased. In this way, the control unit 14 adjusts the heating power of the steam heater so as to keep the pressure in the pot 2 at the fourth target pressure Pt4 in the additional cooking step.

In the present embodiment, for example, the fourth target pressure Pt4 is 4 kPa, and the pressure in the pot 2 is maintained in the range of ± 1 kPa from the third target pressure Pt3. In the fourth mode, the temperature in the pot 2 in the additional cooking step changes in the range of about 100.5 ° C to 101 ° C.

The additional cooking process is performed at the initial stage of the steaming process for a predetermined time according to the selected rice cooking course. Further, the steaming step ends when a predetermined time elapses from the start of the steaming step according to the selected rice cooking course.

[effect]
According to the pressure type rice cooker according to the present embodiment, the following effects can be obtained.

According to the pressure-type rice cooker according to the present embodiment, the control unit 14 sets either the first mode or the second mode based on the rice information in the boiling maintenance step, depending on the rice quality. I'm cooking rice. When set to the first mode, the control unit 14 controls the pressure valve moving mechanism 12 in the boiling maintenance step to raise the pressure in the pan 2 to the first target pressure Pt1 and then lower it. When the control unit 14 is set to the second mode, the control unit 14 controls the pressure valve moving mechanism 12 in the boiling maintenance step to reduce the pressure in the pot 2 to the second target pressure Pt2, which is lower than the first target pressure Pt1. Raise it and then lower it. With such a configuration, the boiling maintenance step can be performed at a pressure corresponding to the quality of the rice, and the taste of the rice can be further improved.

For example, old rice or hard rice that is difficult to gelatinize is cooked in the first mode. In the first mode, the control unit 14 controls the pressure valve moving mechanism 12 to raise the pressure in the pan 2 to the first target pressure Pt1 and then lower it. As a result, by causing sudden boiling in the pot 2 and stirring the rice in the pot 2, the temperature in the pot 2 can be made uniform and uneven cooking can be suppressed.

Further, in the first mode, when the pressure in the pot 2 is raised to the first target pressure Pt1, the control unit 14 controls the pressure valve moving mechanism 12 before lowering the pressure in the pot 2. The pressure adjustment step of holding the first target pressure Pt1 is performed. This makes it possible to further promote the gelatinization of rice that is difficult to gelatinize.

On the other hand, new rice or soft rice that is easily gelatinized is cooked in the second mode. In the second mode, the control unit 14 controls the pressure valve moving mechanism 12 to raise the pressure in the pan 2 to a second target pressure Pt2 lower than the first target pressure Pt1 and then lower it. As a result, it is possible to prevent excessive gelatinization of rice that is easily gelatinized, such as new rice or soft rice, and to prevent the rice from rubbing against each other. As a result, the stickiness of the cooked rice can be suppressed, that is, the stickiness of the cooked rice can be reduced.

In the first mode, the control unit 14 generates a pressure change in which the pressure in the pot 2 is raised to the target pressure and then lowered a plurality of times. In the initial stage of the boiling maintenance step, the control unit 14 generates the first pressure change in which the pressure in the pot 2 is raised to the first target pressure Pt1 and then lowered, and the target pressure in the second and subsequent pressure changes is set. It is lower than the first target pressure Pt1.

Further, even in the second mode, the control unit 14 generates a pressure change in which the pressure in the pot 2 is raised to the target pressure and then lowered a plurality of times. In the initial stage of the boiling maintenance step, the control unit 14 generates the first pressure change in which the pressure in the pot 2 is raised to the second target pressure Pt2 and then lowered, and the target pressure in the second and subsequent pressure changes is set. The pressure is lower than the second target pressure Pt2.

With such a configuration, it is possible to stir the rice in the pot 2 while suppressing the increase in the stickiness of the rice in the boiling maintenance step. Thereby, the taste of rice can be further improved.

According to the pressure-type rice cooker according to the present embodiment, the control unit 14 sets either the third mode or the fourth mode based on the rice information in the initial additional cooking step of the steaming step. When the control unit 14 is set to the third mode, the control unit 14 adjusts the amount of superheated steam supplied from the steam supply unit 15 into the pot 2 by adjusting the heating power of the steam heater in the additional cooking step, and the inside of the pot 2 The pressure of is maintained at the third target pressure Pt3. On the other hand, when the control unit 14 is set to the fourth mode, the control unit 14 adjusts the amount of superheated steam supplied from the steam supply unit 15 into the pot 2 by adjusting the heating power of the steam heater in the additional cooking step. The pressure in 2 is held at the fourth target pressure Pt4, which is lower than the third target pressure Pt3. With such a configuration, the additional cooking process can be performed with a pressure corresponding to the quality of the rice, and the taste of the rice can be further improved.

In the present embodiment, the first mode and the second mode have been described as examples of the modes set according to the rice quality in the boiling maintenance step, but the mode is not limited thereto. There may be two or more modes in the boiling maintenance step. Similarly, the third mode and the fourth mode have been described as examples of the modes set according to the rice quality in the additional cooking step included in the steaming step, but the present invention is not limited thereto. There may be two or more modes in the additional cooking process. The number of modes may be increased according to the number of rice information to be cooked.

In the present embodiment, the first mode and the third mode have been described with the old rice mode as an example, and the second mode and the fourth mode have been described with the new rice mode as an example, but the present invention is not limited thereto. For example, the mode may be a mode for setting the type of rice such as "white rice", "brown rice" and "washless rice", or the method of cooking rice such as "soft" and "hard".

In the present embodiment, an example in which either the first mode or the second mode is executed in the boiling maintenance step and either the third mode or the fourth mode is executed in the additional cooking step will be described. However, it is not limited to this. For example, in the boiling maintenance step, rice is cooked by selecting either the first mode or the second mode according to the rice quality, and in the additional cooking step, the rice is cooked in a predetermined sequence regardless of the rice quality. You may go. Alternatively, in the boiling maintenance step, rice is cooked in a predetermined sequence regardless of the rice quality, and in the additional cooking step, either the third mode or the fourth mode is selected according to the rice quality to cook the rice. You may go.

In the present embodiment, an example in which the additional cooking step is performed once has been described, but the present invention is not limited to this. For example, the additional cooking step may be executed a plurality of times.

In the present embodiment, the first target pressure Pt1, the second target pressure Pt2, the third target pressure Pt3, and the fourth target pressure Pt4 have been described by showing exemplary numerical values for the sake of simplicity, but are limited thereto. Not done. These numbers may be determined according to the rice information and the rice cooking course.

In the present embodiment, as the rice information acquisition unit for acquiring rice information, the display operation unit 13 in which the user inputs rice information has been described as an example, but the present invention is not limited thereto. For example, the rice information acquisition unit may acquire rice information by reading a barcode attached to a bag containing rice with a reader. For example, the barcode may contain information such as the harvest time or brand of rice.

In the present embodiment, the control unit 14 has described an example of setting the first mode, the second mode, the third mode, and the fourth mode based on the rice information, but the present invention is not limited thereto. For example, the mode may be determined by displaying each mode on the display operation unit 13 and selecting the mode by the user. That is, the rice information acquisition unit may acquire the information of the mode selected by the user as the rice information.

In the present embodiment, an example of detecting the pressure in the pot 2 by using the pressure sensor unit 21 as the pressure detecting unit for detecting the pressure in the pot 2 has been described, but the present invention is not limited to this. For example, the pressure detecting unit may estimate the pressure in the pot 2 from the temperature in the pot 2.

FIG. 9 is a graph showing the relationship between the temperature and the pressure in the pot of the pressure-type rice cooker according to the embodiment. As shown in FIG. 9, since the temperature and the pressure in the pot 2 are correlated, the pressure in the pot 2 can be estimated from the temperature in the pot 2. Therefore, the pressure detecting unit may estimate the pressure in the pot 2 based on the detected temperature in the pot 2.

In the present embodiment, in the first mode of the boiling maintenance step, the control unit 14 raises the pressure in the pot 2 to the first target pressure Pt1 and then holds the pressure in the pot 2 at the first target pressure Pt1. The example of this is described, but the present invention is not limited to this. For example, in the first mode, the control unit 14 may increase the pressure in the pot 2 to the first target pressure Pt1 and then immediately decrease the pressure in the pot 2. As a result, in the first mode, excessive gelatinization of rice can be suppressed and stickiness of rice can be suppressed.

In the present embodiment, the control unit 14 describes an example in which the pressure in the pot 2 is raised to the second target pressure Pt2 and then immediately lowered in the second mode of the boiling maintenance step. However, it is not limited to this. For example, in the second mode, the pressure in the pot 2 may be increased to the second target pressure Pt2, and then the pressure in the pot 2 may be held at the second target pressure Pt2. Thereby, in the second mode, the gelatinization of rice can be promoted.

In the present embodiment, the control unit 14 causes, in the first mode and the second mode of the boiling maintenance step, a plurality of pressure changes in which the pressure in the pot 2 is raised to the target pressure and then lowered to the atmospheric pressure. Has been described, but is not limited to this. For example, the control unit 14 may generate the pressure change at the initial stage of the boiling maintenance step only once in the first mode and the second mode. As a result, excessive gelatinization of rice can be suppressed and stickiness of rice can be suppressed.

Although the present invention has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various modifications and modifications are obvious to those skilled in the art. It should be understood that such modifications and modifications are included within the scope of the invention as long as it does not deviate from the scope of the invention according to the appended claims.

The pressure-type rice cooker according to the present invention can further improve the taste of rice, and is therefore useful for, for example, household-use and commercial-use pressure-type rice cookers.

1 Rice cooker body 1A Hinge part 1a Pot storage part 1b Upper frame 1ba Cylindrical part 1bb Flange part 1bc Tank storage part 1c Coil base 2 Pot 2a Flange part 3 Outer lid 3A Hinge shaft 3a Upper outer shell member 3b Lower outer shell member 3c Through hole 3d recess 3da steam escape hole 4 inner lid 4a, 4b steam discharge hole 4c steam supply hole 4d through hole 5 pot bottom heating unit (heating device)
5a In-bottom heating coil 5b Out-of-bottom heating coil 6 Pot temperature sensor 7 Torsion coil spring 8 Lid opening device 8A Hook shaft 9 Steam cylinder 9a Steam relief hole 10 Pressure suppression valve 11 Pressure valve 12 Pressure valve moving mechanism 13 Display operation unit (US) Information acquisition department)
13A Liquid crystal display 13B button 14 Control unit 15 Steam supply unit 16 Steam introduction pipe 17 Steam discharge pipe 18 Water tank 19 Water tank heating coil 21 Pressure sensor unit (pressure sensor unit)
81 Open lid button

Claims (8)

With a pot,
A heating device that heats the pot and
The lid that closes the opening of the pot and
A pressure valve that opens and closes a steam discharge hole that communicates the inside of the pot with the lid.
A pressure valve moving mechanism that adjusts the pressure in the pot by moving the pressure valve between the closed position that closes the steam discharge hole and the open position that opens the steam discharge hole.
A pressure detection unit that detects the pressure inside the pot,
The Rice Information Acquisition Department, which acquires rice information,
A control unit that controls the heating device and the pressure valve moving mechanism to perform a rice cooking process including a boiling maintenance process.
Equipped with
The control unit sets either a first mode or a second mode based on the rice information acquired by the rice information acquisition unit, and when the first mode is set, the pot is used in the boiling maintenance step. When the pressure inside the pot is raised to the first target pressure and then lowered to the second mode, the pressure inside the pot is lowered to the second target pressure lower than the first target pressure in the boiling maintenance step. Raise it, then lower it ,
In the first mode, a pressure change in which the pressure in the pot is raised to the target pressure and then lowered is generated a plurality of times.
In the initial stage of the boiling maintenance step, the pressure in the pot is raised to the first target pressure and then lowered to generate the first pressure change.
The target pressure in the pressure change from the second time onward is made lower than the first target pressure.
Pressure type rice cooker. The pressure according to claim 1, wherein in the first mode, the control unit raises the pressure in the pot to the first target pressure and then holds the pressure in the pot at the first target pressure. Type rice cooker. The control unit
In the second mode, a pressure change in which the pressure in the pot is raised to the target pressure and then lowered is generated a plurality of times.
In the initial stage of the boiling maintenance step, the pressure in the pot is raised to the second target pressure and then lowered to generate the first pressure change.
The target pressure in the pressure change from the second time onward is made lower than the second target pressure.
The pressure-type rice cooker according to claim 1 or 2. A steam supply unit that supplies steam to the pot is provided.
The control unit controls the heating device, the pressure valve moving mechanism, and the steam supply unit to perform a re-cooking step. In the re-cooking step, the rice information acquired by the rice information acquisition unit and the rice information are described. The pressure-type rice cooker according to any one of claims 1 to 3 , which controls the steam supply unit based on the pressure in the pot detected by the pressure detection unit. The control unit sets either a third mode or a fourth mode based on the rice information, and when the third mode is set, the steam supply unit moves into the pot in the additional cooking step. When the amount of steam to be supplied is controlled to keep the pressure in the pot at the third target pressure and the fourth mode is set, the pressure in the pot is kept from the third target pressure in the additional cooking step. The pressure-type rice cooker according to claim 4 , which holds the rice at a small fourth target pressure. The pressure-type rice cooker according to any one of claims 1 to 5 , wherein the rice information includes information on at least one of new rice, old rice, and a brand. The pressure-type rice cooker according to any one of claims 1 to 6 , wherein the rice information acquisition unit acquires the rice information by input by a user. It is equipped with a pot temperature detector that detects the temperature inside the pot.
The pressure-type rice cooker according to any one of claims 1 to 7 , wherein the pressure detecting unit estimates the pressure in the pot based on the temperature in the pot detected by the pot temperature detecting unit.

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