JP2012050488A - Pressure rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure rice cooker that is provided with two pressure valves for adjusting the pressure inside a pot to cook rice.SOLUTION: The pressure rice cooker is provided for cooking rice by increasing the pressure inside the pot higher than atmospheric pressure. The pressure rice cooker includes a controller that is provided with a memory unit for memorizing a rice cooking program. The memory unit memorizes the selection of pressure valves and the frequency and time for opening the valves in a boiling maintaining step according to the content of rice to be cooked in the pot. The controller includes: a valve selecting/operating unit for retrieving, from the memory unit, the selection of one of the two pressure valves or both of the pressure valves according to the content of rice to be cooked determined by a content determination unit in the boiling maintaining step, and putting the selected valve in operation; and a valve-opening frequency/time controlling unit for retrieving, from the memory unit, the opening frequency and time of the selected pressure valve by the valve selecting/operating unit, and controlling the opening frequency and the opening time.

Description

  The present invention relates to a pressure-type rice cooker that boosts the inside of a pan to atmospheric pressure or more, and more specifically, relates to a pressure-type rice cooker that cooks rice by adjusting the pressure in the pan by providing two pressure valves. Is.

  Recent electric rice cookers (hereinafter referred to as rice cookers) are equipped with a microcomputer, and this microcomputer adjusts the rice rice cooking menu according to the rice species such as white rice and brown rice, or hard and soft rice. Now you can cook rice, such as your favorite rice menu, where you can cook to your desired hardness. This rice cooker has a pot for storing rice cooked rice and water, a heating means for heating the cooked rice in the pot, a control means for controlling the heating means, a menu selection means for selecting a rice cooking menu, When a predetermined rice cooking menu is selected, the control means, corresponding to the rice cooking menu, absorbs a predetermined amount of water to the rice in the pot, and after boiling the water in the pot is heated and boiled at once The heating process that keeps the boiling state, the boiling maintenance process that gelatinizes and cooks rice starch, and the steaming process that removes excess moisture from the cooked rice and further promotes gelatinization A series of rice cooking processes are performed, and rice is cooked.

  Such a rice cooker uses an electric heater or an electromagnetic induction coil as the heating means, and installs these heater heat sources at the bottom of the pan to heat the cooked rice in the pan from the bottom of the pan. However, the rice cooker with this structure has a heater heat source installed at the bottom of the pan, so the inner wall surface of the pan bottom closest to the heat source is heated intensively, and first, the cooked rice in contact with this inner wall surface becomes hot. When heated, this high temperature falls as it moves away from the inner wall surface, the center part of the cooked rice becomes lower, and the upper part of this center part becomes the lowest, the inner wall of the pan bottom and the upper center part of the cooked rice A temperature difference occurs between Therefore, due to this temperature difference, the cooked rice may not be cooked uniformly and become uneven, so-called cooking unevenness may occur.

  Since the conventional rice cookers have the above-mentioned subject, in order to solve this subject, the rice cooker which cooks as a rice cooker in a pan is stirred during rice cooking is proposed.

  For example, in Patent Document 1 below, the inside of the pan is increased to atmospheric pressure or higher, the inside of the pan is depressurized a predetermined number of times in the boiling maintenance step, and the cooked rice in the pan is stirred by these depressurization actions. A pressure rice cooker is described. Specifically, this rice cooker is pivotally supported on one side of the rice cooker main body having a pot for containing the cooked rice, a heating means for containing the pot and heating the cooked rice in the pot, and the rice cooker main body. A lid that covers the opening of the pan and the rice cooker body, a pressure valve that is attached to this lid to adjust the pressure in the pan, a pressure valve opening mechanism that controls the opening of this pressure valve, and various rice cooking courses A display operation part to be displayed and selected, and a heating means and a pressure valve opening mechanism based on the rice cooking course / menu selected by the display operation part to heat the cooked rice in the pan to a predetermined temperature, and a water absorption process And a control device that executes a series of rice cooking steps including a start-up heating step, a boiling maintenance step, a steaming step, and the like. .20 atm), and at least the pressure valve is used in the next boiling maintenance process. The pot in pressure during boiling is opened once more forced unit time by the control for reducing a stroke to the vicinity of atmospheric pressure is rice.

  According to this pressure rice cooker, the pressure inside the pan is increased to atmospheric pressure or higher, that is, 1.10 to 2.20 atmospheric pressure, and the pressure valve is forcibly opened at least once during the boiling maintenance step. When this pressure valve is opened, the inside of the pan is rapidly reduced from a high pressure state to the vicinity of atmospheric pressure, and a severe boiling phenomenon, so-called bumping phenomenon, occurs in the pan. Because of this bumping phenomenon, the cooked rice in the pot is stirred, so delicious rice with no uneven rice cooking is cooked. In addition, in a pressure rice cooker having a similar structure, unevenness in cooking occurs regardless of the amount of rice cooked by changing at least one of the number of opening times and the opening time of the pressure valve according to the amount of rice cooked. The thing which cooks rice without doing is described in the following patent document 2. Furthermore, although the rice cooker of these patent documents 1 and 2 has one pressure valve, what provided two pressure valves and performed the same stirring is also described in the following patent document 3. ing. In addition, these patent documents 1-3 are related to the application of the present applicant.

Japanese Patent No. 3852293 (paragraphs [0031] to [0036], FIG. 6) JP 2006-325720 A (paragraph [0019], FIG. 5) Japanese Patent Laying-Open No. 2008-48766 (paragraph [0011], FIG. 2)

  The rice cookers of Patent Documents 1 to 3 described above all depressurize the pan in the pressurized state by forcibly opening the pressure valve during the boiling maintenance step, and this decompression causes a bumping phenomenon in the pan. The rice grains are stirred, so-called rice grains are danced and stirred, so that the rice is cooked without uneven cooking.

  However, it has been found that even in these rice cookers, the amount of rice cooked becomes excessively stirred, and on the other hand, stirring is insufficient, and the rice is broken or uneven due to excessive and insufficient stirring. That is, when the amount of cooked rice is small, if the opening time of the pressure valve is lengthened and the number of times of opening is increased, agitation is excessively agitated. Due to this excessive stirring, cracked rice grains and the like, the cooked rice may be crumbled and the taste may be inferior. Further, when the amount of cooked rice is large, even if the opening time of the pressure valve is lengthened and the number of times of opening is increased, the amount of cooked rice is large, so that stirring is insufficient and uneven cooking may occur. At this time, if the opening time of the pressure valve is lengthened and the number of times of opening is increased, the pressure in the pan is excessively lowered and pressure cooking is not possible, so that the taste is lacking. Further, if the opening time of the pressure valve is lengthened and the number of times of opening is increased, the amount of the umami component ejected may increase, exceeding the capacity of the storage tank and being blown out to the outside. In addition, even in these rice cookers, although the thing of the said patent document 3 has provided two pressure valves, it turned out that the same subject also exists in this rice cooker.

  Then, this invention was made | formed in order to solve the subject which a prior art has, and the objective of this invention provides two pressure valves, and with the increase in the amount of rice cooking, two pieces are kept in a boiling maintenance process. Either one or both of the pressure valves are opened a predetermined number of times, and the cooked rice in the pan is efficiently stirred, especially when the amount of cooked rice is large, a pressure rice cooker that does not cause insufficient stirring. It is to provide.

  Another object of the present invention is to have the above-mentioned purpose, and when the rice is generally divided into rice, the number of times the two pressure valves are opened in the boiling maintenance process is increased along with the increase in the amount of cooked rice. Another object of the present invention is to provide a pressure-type rice cooker in which the cooked rice in the pan is efficiently agitated and there is no spilling of rice balls.

  Furthermore, the other object of the present invention is that when cooking brown rice, both the two pressure valves are opened a predetermined number of times in the boiling maintenance step, and the cooked rice in the pan is efficiently stirred. An object of the present invention is to provide a pressure rice cooker that prevents a lack of stirring from occurring even when the amount of cooked rice is large.

  In order to achieve the above object, a pressure rice cooker according to claim 1 of the present application comprises a pot for storing a rice cooked product containing rice and water, and heating means for containing the pan and heating the cooked product. The rice cooker body provided, the lid that can be opened and closed to close the opening of the pan and the rice cooker body, the two pressure valves disposed on the lid body, the heating means and the pressure valve are controlled to absorb water A rice cooking program that performs a series of rice cooking processes including a process, a start-up heating process, and a boiling maintenance process, and in which the pressure valve is intermittently controlled to open for a predetermined number of times in a predetermined opening time, and rice cooking in the pot In the pressure type rice cooker comprising a control device having a quantity judging means for judging the quantity and a course selecting means for selecting a rice cooking course / menu containing rice seeds, and cooking the rice by raising the inside of the pan above atmospheric pressure, The control device stores the rice cooking program. Storage means, and the storage means stores the selection of the pressure valve, the number of times of opening and the opening time in the boiling maintaining step in correspondence with the amount of rice cooked in the pan, and the control device In the boiling maintaining step, in accordance with the amount of rice cooked determined by the amount determination means, the valve selection for calling one of the two pressure valves or selecting both pressure valves from the storage means for operation. It is characterized by comprising operating means and valve opening frequency / time control means for calling and controlling the number of times and the opening time of the pressure valve selected by the valve selection / actuation means from the storage means.

According to a second aspect of the present invention, in the pressure rice cooker according to the first aspect, the storage means further corresponds to a hardness cooking menu, and the number of times the pressure valve is selected and opened in the boiling maintenance step. And remember the opening time,
In the boiling maintaining step, the control device is further configured so that the valve selection / operation means is one of the two pressure valves according to the hardness cooking menu selected by the course selection means. Or both pressure valves are selected, and the valve opening number / time control means controls the number of times and the opening time of the pressure valve selected by the valve selection / operation means.

  The invention of claim 3 is the pressure rice cooker according to claim 1 or 2, wherein when the rice is selected by the course selection means, the valve selection / operation means is not more than a predetermined reference rice cooking amount. In addition, one of the two pressure valves is closed, and only the other is opened and closed for a predetermined number of times and for an open time, and the two pressure valves are turned on when the rice cooking amount exceeds the reference rice cooking amount. It is characterized by opening and closing at a predetermined number of times and opening time at the same time.

  According to a fourth aspect of the present invention, in the pressure rice cooker according to the third aspect of the present invention, when the white rice / usual menu is selected by the course selecting means, the control device is configured to control the pressure valve in the boiling maintaining step. When the number of times of opening exceeds the reference number of times, the opening time is shortened compared to the opening time before the reference number of times, and the opening and closing is performed.

  According to a fifth aspect of the present invention, in the pressure rice cooker according to the third aspect, when the control device selects a white rice / curry menu by the course selection means, the pressure valve After the opening and closing for a predetermined number of times, it is opened and the boiling maintenance process is continued.

  The invention of claim 6 is the pressure rice cooker according to claim 1, wherein the storage means stores the number of times and the opening time of the pressure valve in the boiling maintenance step in correspondence with brown rice, In the boiling maintaining step, the control device further selects the pressure valve according to the brown rice selected by the course selection means, the valve opening frequency / time control means is The opening number and the opening time of the pressure valve selected by the valve selection / operation means are controlled.

  By providing the above configuration, the present invention has the following excellent effects. That is, according to the invention of claim 1, since either one or both of the two pressure valves are selected according to the amount of cooked rice, the pressure reduction speed of the pressure in the pan is reduced during the boiling maintenance process. Adjustment is possible. That is, when one pressure valve is selected, the pressure reduction speed is slower than when both are selected, and when both are selected, the pressure reduction speed is increased. Therefore, if one pressure valve is selected when the amount of cooked rice is small, the decompression speed is slowed, and over-stirring of the cooked rice can be prevented. Stir things efficiently.

  According to the invention of claim 2, since either one or both of the two pressure valves are selected according to the hardness cooking menu, the pressure in the pan is maintained during the boiling maintenance step. The decompression speed can be adjusted.

  According to the invention of claim 3, since either one or both of the two pressure valves are selected according to the rice variety “white rice”, the pressure in the pan is maintained during the boiling maintenance step. The decompression speed can be adjusted.

According to the inventions of claims 4 and 5, in white rice / normal menu / white rice / curtain menu,
Since one or both of the two pressure valves are selected, the pressure reduction speed of the pressure in the pan can be adjusted during the boiling maintenance process.

  According to the invention of claim 6, in the brown rice cooking course, either one or both of the two pressure valves are selected, so that the pressure reduction speed of the pressure in the pan can be adjusted during the boiling maintenance process. become.

FIG. 1 is an external perspective view of a pressure rice cooker according to an embodiment of the present invention. FIG. 2 is a perspective view of the pressure rice cooker of FIG. FIG. 3 is a rear view of the lid body with the inner lid removed. 4 is a cross-sectional view of the pressure rice cooker of FIG. 5 shows a part of the lid of FIG. 4, FIG. 5A is a schematic sectional view of a part thereof, and FIG. 5B is a sectional view of two pressure valves arranged on the lid. FIG. 6 is a perspective view of the lid body with the outer lid of the pressure rice cooker of FIG. 1 removed. FIG. 7 is a plan view of the pressure valve opening mechanism. FIG. 8 is a plan view for explaining the operation of the pressure valve opening mechanism of FIG. FIG. 9 is a control block diagram constituting the control device. FIG. 10 is a flowchart of the rice cooking course / menu. FIG. 11 is a temperature / pressure curve diagram showing changes in temperature and pressure in the pan in the rice cooking process. FIG. 12 is a regulation table that defines the relationship between the amount of cooked rice, the number of times the pressure valve is opened, and the opening time in the hardness cooking menu “white rice / normal”. 13A is a chart showing the relationship between the amount of cooked rice and the number of times the pressure valve is opened and the opening time in “white rice / warm” and FIG. 13B. FIG. 14 is a chart showing the relationship between the amount of cooked rice in brown rice, the number of times the pressure valve is opened, and the opening time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment shown below exemplifies a pressure rice cooker for embodying the technical idea of the present invention, and is not intended to specify the present invention. It is equally applicable to those of other embodiments within the scope.

  First, with reference to FIGS. 1-5, the structure of the pressure type rice cooker which concerns on embodiment of this invention is demonstrated. 1 is an external perspective view of the pressure rice cooker according to the embodiment of the present invention, FIG. 2 is a perspective view of the pressure rice cooker of FIG. 1 with the lid opened, and FIG. 3 is the inner lid removed. 4 is a rear view of the lid body in a state, FIG. 4 is a cross-sectional view of the pressure-type rice cooker of FIG. 1 longitudinally cut at a substantially central portion, FIG. 5 shows a part of FIG. 4, and FIG. FIG. 5B is a cross-sectional view of two pressure valves disposed on the lid.

  A pressure-type rice cooker (hereinafter simply referred to as “rice cooker”) 1 according to an embodiment of the present invention, as shown in FIG. 1, FIG. 4, and FIG. 5, is a pan 9 for containing rice and water. A rice cooker main body (hereinafter referred to as a main body) 2 provided with heating means 5 for heating the cooked rice in the pan inside and an opening in which the pan 9 is accommodated, and pivotally supported on one side of the main body 2 A lid 10 that covers the opening of the pan and the main body, two pressure valves 13A and 13B that are arranged on the lid 10 and adjust (increase and depressurize) the internal pressure in the pan 9, and these pressure valves Pressure valve opening mechanisms 17A and 17B for opening, lid locking members 23 (see FIGS. 7 and 8) for locking the opening of the lid 10 in conjunction with these pressure valve opening mechanisms, and various rice cooking courses / Display means 30 for displaying and selecting a menu, and heating means 5 based on the rice cooking course selected by the display operation part And a control device that controls each pressure valve 13A, 13B to heat the cooked rice in the pan 9 to a predetermined temperature and execute a series of rice cooking steps including a water absorption step, a rising heating step, a boiling maintenance step, and a steaming step. 33 (see FIG. 9). Hereinafter, these members will be described.

  As shown in FIGS. 2 and 4, the main body 2 includes a bottomed box type outer case 3 and an inner case 4 accommodated in the outer case 3. A gap is formed between the outer case 3 and the inner case 4, and the control circuit board 6 constituting the control device 33 is provided in this gap. The inner case 4 accommodates a pot 9 made of a deep bottom container. This pan 9 is formed of a clad material of aluminum and stainless steel. The inner case 4 is provided with a pan bottom heater 5b and a side heater 5a on the bottom 4a and side 4b, respectively, and a pan bottom temperature detecting sensor S1 including a thermistor for detecting the pan bottom temperature is provided on the bottom 4a. . As the pot bottom heater 5b, an electromagnetic induction coil (hereinafter also simply referred to as an IH coil) wound in an annular shape is used. Further, as shown in FIG. 4, the main body 2 has a lid locking mechanism 7 for locking the lid 10 in a closed state, and unlocking the lid locking mechanism to open the lid 10. A release button 8 is provided.

  As shown in FIGS. 4 to 6, the lid 10 has an inner lid 11 that closes the opening of the pan 9, and an outer lid 29 that is detachably attached to cover the opening of the main body 2. is doing. The lid 10 is pivotally supported on one side by the hinge mechanism 2A on the main body 2 and a lid locking member 23 is provided on the other side. The lid locking member 23 is engaged with the lid locking mechanism 7 of the main body 2. The structure is stopped. As shown in FIG. 7, the lid locking member 23 has a locking shaft 26 fixed to the lid frame, and a locking member 24 rotatably attached to the locking shaft 26. The locking member 24 includes a pair of locking claws 25a and 25b that are locked to the lid locking mechanism 7 of the main body 2 provided at a predetermined interval on one end side, and a lid locking member 28 ( 8 and a lock piece 27 that locks the movement of the locking member 24.

  As shown in FIGS. 2 to 4, the inner lid 11 has a disk shape that is large enough to close the opening of the pan 9, and is detachably attached to the outer lid 29. The inner lid 11 is provided with a dispersing plate 12 (see FIG. 2 and FIG. 4) that disperses the screw on the side of the pan 9. The rice dispersion plate 12 is attached to the inner lid 11 by a detachable fixing means, and the rice balls stored in the later-described rice cake storage tank 32 are dispersed almost uniformly into the pan 9 and returned. ing. In addition, as shown in FIGS. 5 and 6, the inner lid 11 is provided with two pressure valves 13A and 13B on the outer lid side. These pressure valves 13A and 13B have the same structure. One pressure valve 13A will be described. As shown in FIGS. 4 and 5, the pressure valve 13A is movably mounted on the valve seat 14b provided with a valve hole 14a having a predetermined diameter and on the valve seat 14b so as to close the valve hole 14a. The metal ball 15 includes a cover 14c that holds the ball 15 on the valve seat 14b by restricting the movement of the ball 15, and the metal ball 15 rolls on the valve seat 14b by its own weight. The valve hole 14a is closed. The cover 14c is provided with a steam temperature detection sensor S2 that detects the steam temperature in the pan.

  These pressure valves 13A and 13B are opened intermittently a predetermined number of times in a predetermined unit time in the boiling maintenance step via the corresponding pressure valve release mechanisms 17A and 17B, respectively, according to a command from the control device 33. It serves to stir the cooked rice in 9.

These pressure valve opening mechanisms 17A and 17B are provided on the frame 16 to which the outer lid 29 is fixed, as shown in FIGS. The frame body 16 is composed of a frame body having a high mechanical strength. These pressure valve opening mechanisms 17A and 17B have the same structure. As shown in FIGS. 7 and 8, the pressure valve opening mechanism 17A includes a cylinder 18a around which a solenoid coil is wound, a plunger 19a that enters and exits from the cylinder by excitation of the solenoid coil, and the plunger 19a. The movable member 20a that is slidably mounted on the tip of the lens and the operating rod 22a that pushes the ball 15 are connected to each other by a link bar 21a. The link bar 21a is provided with a protrusion 21 ₁ loosely fitted in the loose fitting hole 22 ₂ of the operating rod 22a at a substantially central portion. The operating rod 22a includes a tip 22a 'for pushing the ball 15 at one end, a loose fitting hole 22 _{2 at the} other end, a solid protrusion 22 ₃ to which one end of the link bar 21a is fixed at a substantially central portion, and a side edge. pressing piece 22 ₁ is moved by pressing the lid lock member 28 is provided by the sliding movement of the actuating rod 22a. The other pressure valve opening mechanism 17B has the same configuration as the pressure valve opening mechanism 17A, that is, a cylinder 18b around which a solenoid coil is wound, a plunger 19b that enters and exits from the cylinder 18b by excitation of the solenoid coil, and a plunger 19b. The moving member 20b attached to the tip of the moving member 20b, the actuating rod 22b that pushes the ball 15, and the link bar 21b that connects the moving member 20b and the actuating rod 22b. Both link bars 21a and 21b intersect, and one end is connected to each moving member 20a and 20b and the other end is connected to both actuating rods 22a and 22b. Both cylinders 18a and 18b are mounted with spring bodies (not shown), and when the solenoid coils of both cylinders 18a and 18b are de-energized, the tip end portions 22a 'and 22b' of both operating rods 22a and 22b are It jumps forward by the force of this spring body and pushes the ball 15 to open each valve hole 14a (see FIG. 5, one is not shown).

Further, a lid lock member 28 is interposed between the pressure valve opening mechanisms 17A and 17B and the lid locking member 23. As shown in FIGS. 7 and 8, the lid lock member 28 is slidably fixed between the operating rods 22a and 22b. The lid locking member 28 has a stopper portion 28a that abuts the locking piece 27 of the lid locking member 23 at one end and restricts the movement of the locking piece 27, and the pushing pieces 22 ₁ of both operating rods 22a and 22b at the other end. And a pair of moving pieces 28 ₁ and 28 ₂ slidably moved against the urging force of the spring body 28b ′. The lid lock member 28 functions to prevent the lid 10 from being opened when any one of the pressure valves 13A and 13B is in a closed state. Both pressure valves 13A and 13B are opened when the inside of the pan 9 is in a non-pressurized state, that is, in an open state, and these valve holes 14a are provided at the tip portions 22a 'and 22b' of the operating rods 22a and 22b. Is opened by being pushed by the force of a spring body (not shown).

The two pressure valves 13A and 13B are opened / closed at the same time or only one of the pressure valves is opened / closed via the respective pressure valve opening mechanisms 17A and 17B according to a command from the control device 33. . The opening / closing operations of the pressure valves 13A and 13B are the same. And when either pressure valve 13A, 13B exists in a closed state, the cover body 10 is not opened. For example, when one solenoid valve is energized based on a command from the control device 33, the plunger 19a is retracted into the cylinder 18a and the pressure valve 13A is opened and closed via the moving member 20a and the link lever 21a. The operating rod 22a moves backward, the tip 22a 'of the operating rod 22a moves away from the ball 15, and the valve hole 14a is closed by the weight of the ball 15. Further, when the operating rod 22a is retracted by this operation, the pushing piece 22 ₁ of the operating rod 22a abuts against the operating piece 28 ₁ of the lid lock member 28 and slides against the urging force of the spring body 28b ′. Then, the stopper portion 28a sinks below the lock piece 27 of the lid locking member 23 to invalidate the operation of the lid locking member 23. That is, even if the release button 8 is operated, the lid 10 is not opened. . When the excitation to the solenoid coil is stopped while the pressure valve 13A is closed, the plunger 19a jumps out of the cylinder 18a by the biasing force of a spring body (not shown). As a result, the tip 22a 'of the operating rod 22a pushes the ball 15 to open the valve hole 14a. The other pressure valve 13B is opened and closed in the same manner, and the lid locking member 23 is locked in the closed state. Further, the simultaneous opening and closing of both the pressure valves 13A and 13B is performed in the same manner, and the lid locking member 23 is locked when both the pressure valves are closed.

  Further, as shown in FIG. 1, the main body 2 is provided with a display operation unit 30 on the front surface thereof. As shown in FIG. 1, the display operation unit 30 includes a display panel 31 on which various rice cooking courses / menus and times are displayed, and a plurality of switch operations provided on the left and right and below the display panel 31. Button. These switch operation buttons include a rice cooking / start button for operating the rice cooker 1, a course selection button for selecting a rice cooking course, a rice selection button, and a key for selecting / determining a rice cooking course / menu displayed on the display panel. And so on. Of the rice cooking courses / menus, the rice cooking course is a course for selecting rice varieties, and the rice cooking menu is a cooking menu such as hardness when cooking rice after the rice is selected.

  As shown in FIG. 4, the inner lid 11 and the outer lid 29 are joined with a gap space of a predetermined width therebetween. The outer lid 29 is detachably mounted with a rice bowl storage tank (hereinafter referred to as a storage tank) 32 that temporarily stores a rice bowl containing moisture ejected from the pan 9. The storage tank 32 has a space for temporarily storing the inside of the storage tank 32, a steam port 32a through which steam is released to the outside, and a tank valve. The gap space and the space of the storage tank 32 are storage portions that temporarily store rice balls. The rice cake is a sticky paste-like juice, and this paste-like juice contains a umami component. If this rice cake is discharged out of the pan 9 as it is, the rice is not cooked deliciously. Therefore, when the storage tank 32 for storing the rice bowl is provided, the rice cake is temporarily stored in the storage tank 32, and when the inside of the pan 9 is finished and the inside of the pan 9 becomes negative pressure, The rice cake can be cooked deliciously by returning the rice cake into the pan through the rice dispersion plate 12.

  As shown in FIG. 9, the control device 33 includes hardware including a circuit board on which a CPU, a ROM, a RAM, and the like are mounted, and includes a rice cooking / start button, a course selection button, a rice selection button, and a pan bottom temperature detection sensor S1. These buttons and sensors are connected to the steam temperature detection sensor S2 and the like, and signals from these buttons are input to the CPU. Further, a timer, a ROM, a RAM (storage means), and the like for measuring a predetermined time are connected to the CPU. The storage means stores data such as the selection of the pressure valve, the number of times of opening, and the opening time in the boiling maintaining step in correspondence with the rice cooking program for executing a series of rice cooking steps and the amount of rice cooking in the pan. Moreover, this control apparatus is either one of two pressure valves according to the rice cooking amount determined by the rice cooking amount determination means in the rice cooking amount determination means which determines the amount of rice cooking in the pan, and the rising maintenance step. A valve selection / operation means for selecting and operating one or both pressure valves, and a valve opening number / time control means for controlling the number of times and the opening time of the pressure valve selected by the valve selection / operation means. I have.

  Furthermore, heating means 5 such as heaters 5a and 5b, pressure valve opening mechanisms 17A and 17B, a display panel 31 and the like are connected to the output unit (driver).

  The control device 33 controls the heating means and the pressure valve opening mechanisms 17A and 17B corresponding to the rice seed course / cooking menu, and causes the rice in the pan to absorb a predetermined amount of water as shown in FIG. Water absorption process I, after-absorption heating process II that heats the inside of the pan at once and boils, boiling maintenance process III that maintains boiling and cooks, steaming process that removes excess water from the cooked rice, book A series of rice cooking processes including processes are performed. The steaming process is steaming 1, additional cooking and steaming 2. During cooking, the pressure in the pan is increased to 1.2 atmospheres. Note that the pressure during the pressure increase may be higher than this. Since this invention has the characteristics in the control in a boiling maintenance process especially among these rice cooking processes, below, the control of this boiling maintenance process is explained in full detail, and description of another process is abbreviate | omitted.

  With reference to FIGS. 10-14, the rice cooking process of a rice seed cooking course / hardness cooking menu is demonstrated. 10 is a flowchart showing the rice cooking process in rice cooking course / hardness cooking, FIG. 11 is a temperature / pressure curve diagram showing the temperature and pressure changes in the pan in the rice cooking process, and FIGS. , Which defines the relationship between the amount of cooked rice and the number of times the pressure valve is opened and the open time in the hardness cooking menu, FIG. 12 is “white rice / normal”, FIG. 13A is “white rice / curd” and FIG. 13B is It is a rule table of “white rice / soft”. In these charts, the pressure valves 13A and 13B are indicated as pressure valves A and B.

As shown in FIGS. 12 and 13, the “white rice” hardness cooking menu is divided into “normal”, “warming” and “soft” in white rice, and the pressure valve in the boiling maintenance process of these menus The number of times of opening and the opening time are defined as the following values corresponding to the amount of cooked rice.
1. White rice / normal As shown in FIG. 12, the amount of rice cooked in this white rice / normal menu is “QS” for “small” with less rice, followed by “QM” for “medium” and “QL” for “large”. ”Is divided into large categories, that is, the large-scale rice cooking amounts QS, QM and QL are divided into“ QS ₁ ”for the rice cooking amount“ QS ”,“ QS ₂ ”for“ medium ”and“ QS ₂ ”for“ medium ”, respectively. "QL" large "," QS ₃ "in," QM ₁ "of the rice amount QM" small "," QM ₃ "in the" QM ₂ "and" large "of" medium ", the rice amount QL" small " ₁ ", subdivided into" QL ₃ "of" QL ₂ "and" large "of" medium ", i.e. divided into middle class, defining the opening times and opening time of each of the pressure valve.

The relationship between the major classifications QS, QM and QL is QS <QM <QL. Specific examples are “QS (small)” 0.5 to 1.5 cups, “QM (medium)” 2.0 to 3. 0 cup, “QL (Large)” 3.5 to 5.5 cups, and the relationship of the middle classification is QS ₁ <QS ₂ <QS ₃ , QM ₁ <QM ₂ <QM ₃ and QL ₁ <QL ₂ < QL ₃ , specific examples are “QS _{1 to} QS ₃ ” is 0.5 to 1.5 cups, “QM _{1 to} QM ₃ ” is 2.0 to 3.0 cups, and “QL _{1 to} QL ₃ ”. Is 3.5 to 5.5 cups.

1-1. Number of opening and opening time of pressure valve in rice cooking amount QS Since this rice cooking amount QS is less than other rice cooking amounts QM and QL, two pressure valves 13A and 13B (hereinafter referred to as pressure valve A and pressure valve B) Among them, one pressure valve B is closed and only the other pressure valve A is opened and closed. The number of opening of the pressure valve A is set to am1, am2, and am3 (am1 ≦ am2 ≦ am3) with respect to the respective rice cooking amounts QS ₁ , QS ₂ and QS ₃ (QS ₁ <QS ₂ <QS ₃ ). 1 ≦ (am1, am2, am3) ≦ NMm). A specific example is am1 ≦ am2 ≦ am3 = 4 (times). The opening time of the pressure valve A is set to tAM ₁ , tAM _2, and tAM ₃ (tAM ₁ ≦ tAM ₂ ≦ tAM ₃ ) for each rice cooking amount QS ₁ , QS _2, and QS ₃ , respectively. For example, tAM ₁ , tAM ₂ and tAM ₃ are 2.0 seconds, 2.5 seconds and 3.0 seconds.

According to this regulation, when the amount of cooked rice QS is small, only one pressure valve is used and it is operated with a predetermined number of times of opening and opening time. Therefore, during the boiling maintenance process, the pressure in the pan is rapidly increased from high pressure to near atmospheric pressure. Decrease, that is, the decompression speed to depressurize is slower than when both pressure valves are opened, and stirring of the cooked rice in the pan is suppressed, so cracking caused by intense collision of rice grains is prevented and crumble Disappear. Also, since in response to cooking amount QS _1, QS ₂ and QS ₃ even cooking of middle classification are defining the opening times and opening time may well stirred more finely efficiently cooking of the pot.

1-2. Number of opening and opening time of pressure valve in rice cooking amount QM This rice cooking amount QM is larger than rice cooking amount QS, and stirring is insufficient with only one pressure valve, so two pressure valves A and B are used. Both pressure valves are opened and closed simultaneously.

The number of times the pressure valves A and B are opened is bm1, bm2 and bm3 (bm1 ≦ bm2) for each rice quantity QM ₁ , QM ₂ and QM ₃ (QM ₁ <QM ₂ <QM ₃ ). ≦ bm3, 1 ≦ (bm1, bm2, bm3) ≦ Nma). A specific example is bm1 ≦ bm2 ≦ bm3 = 4 (times).

The opening times of both pressure valves A and B are tAM ₄ , tAM ₅ and tAM ₆ (tAM ₄ ≦ tAM ₅ ≦ tAM ₆ ) and tBM, respectively, for the respective rice cooking amounts QM ₁ , QM ₂ and QM ₃ . ₄ , tBM ₅ and tBM ₆ (tBM ₄ ≦ tBM ₅ ≦ tBM ₆ ). Specifically, (tAM ₄ , tAM ₅ , tAM ₆ ) and (tBM ₄ , tBM ₅ , tBM ₆ ) are 2.0 seconds, 2.0 seconds, and 3.0 seconds, respectively.

According to this regulation, in the large-class rice cooking amount “QM”, two pressure valves are used, and these pressure valves are operated with a predetermined number of times and an open time, so that the pressure in the pan is increased during the boiling maintenance process. The pressure is reduced at a stroke from the pressure to the vicinity of atmospheric pressure, that is, the pressure reduction pressure is increased, and the cooked rice in the pan is efficiently stirred. Also, since in response to cooking amount QM _1, QM ₂ and QM ₃ even cooking of middle classification are defining the opening times and opening time may well stirred more finely efficiently cooking of the pot.

1-3. The number of times and the opening time of the pressure valve in the rice cooking amount QL Since the rice cooking amount QL is further larger than the rice cooking amount QM, both of the two pressure valves A and B are opened and closed simultaneously like the rice cooking amount QM. These two pressure valves A and B change the opening time up to a predetermined number of times NMm in the first half and a predetermined number of times in the latter half after NMm.

The number of opening of both pressure valves A and B is the respective opening times cm1, cm2 and cm3 (cm1 ≦ cm2) with respect to the respective rice cooking amounts QL ₁ , QL ₂ and QL ₃ (QL ₁ <QL ₂ <QL ₃ ). ≦ cm3, NMm <(cm1, cm2, cm3)). A specific example is NMm = 4, cm1 ≦ cm2 ≦ cm3 = 4-5 (times).

(I) Opening time in the first half (up to a predetermined number of times NMm)
The opening time of these pressure valves A and B is tAM ₇ , tAM ₈ and tAM ₉ (tAM ₇ ≦ tAM ₈ ≦ tAM ₉ ) for each rice cooking amount QL ₇ , QL ₈ and QL ₉ . , TBM ₇ , tBM ₈ and tBM ₉ (tBM ₇ ≦ tBM ₈ ≦ tBM ₉ ). Specifically, (tAM ₇ , tAM ₈ , tAM ₉ ) and (tBM ₇ , tBM ₈ , tBM ₉ ) are 4.0 seconds, 5.0 seconds, and 6.0 seconds, respectively.

(Ii) Opening time in the second half (after a predetermined number of times NMm)
The number of times of opening after the predetermined number of times NMm is obtained by subtracting the predetermined number of times NMm from the respective opening times cm1, cm2, and cm3 with respect to the respective rice cooking amounts QL ₁ , QL ₂ and QL ₃ (QL ₁ <QL ₂ <QL ₃ ). Value, and this value is n. A specific example is n = 1 (times).

The opening times of these pressure valves A and B are tAM ′ ₇ , tAM ′ ₈ and tAM ′ ₉ (tAM ′ ₇ ≦ tAM ′) with respect to the respective rice cooking amounts QL ₁ , QL ₂ and QL ₃ . ₈ ≦ tAM ′ ₉ ), tBM ′ ₇ , tBM ′ ₈ and tBM ′ ₉ (tBM ′ ₇ ≦ tBM ′ ₈ ≦ tBM ′ ₉ ). Specific examples are (tAM ′ ₇ , tAM ′ ₈ , tAM ′ ₉ ) and (tBM ′ ₇ , tBM ′ ₈ , tBM ′ ₉ ) are 2.0 seconds, 2.0 seconds, and 2.0 seconds, respectively. .

According to this regulation, in the large-class rice cooking amount “QH”, two pressure valves are used, and these pressure valves are divided into the first half and the second half, and are operated with a predetermined number of times and opening time. Stir things without excess or deficiency. That is, since the opening time is lengthened in the first half, the decompression speed can be increased and stirring can be performed efficiently, and in the latter half, the opening time is shortened, so that it is possible to prevent the spilling of the stick.
2. As shown in FIG. 13A, the amount of rice cooked in this white rice / curtain menu is divided into large classifications QS, QM and QL, as shown in FIG. 13A, and these are classified into medium classification QS ₁ and QS. ₂ and QS ₃ , QM ₁ , QM ₂ and QM ₃ , QL ₁ , QL _2, and QL ₃ , the number of times and the opening time of the pressure valve are defined.

2-1. Number of opening and opening time of pressure valve in rice cooking amount QS Rice cooking amount “QS (small)” is “QS ₁ ” for rice cooking amount “QS”, “QS ₂ ” for “medium” and “QS ₃ ” for “large”, respectively. Is subdivided into These relationships are in the relationship of QS ₁ <QS ₂ <QS ₃ , and specific examples of QS ₁ , QS ₂ and QS ₃ are 0.5 cup, 1.0 cup and 1.5 cup.

Since this rice cooking amount QS is smaller than the other rice cooking amounts QM and QL, of the two pressure valves A and B, the other pressure valve B is closed and only one pressure valve A is opened and closed. The number of opening of the pressure valve A is ah1, ah2, and ah3 (ah1 ≦ ah2 ≦ ah3) with respect to each rice cooking amount QS ₁ , QS ₂ and QS ₃ (QS ₁ <QS ₂ <QS ₃ ), respectively. And A specific example is ah1 ≦ ah2 ≦ ah3 = 2 (times).

The opening time of the pressure valve A is set to the opening times tAH ₁ , tAH ₂ and tAH ₃ (tAH ₁ <tAH ₂ <tAH ₃ ) with respect to the respective rice cooking amounts QS ₁ , QS ₂ and QS ₃ . In specific examples, tAH ₁ , tAH ₂ and tAH ₃ are 2.0 seconds, 2.5 seconds and 3.0 seconds.

  According to this rule, the inside of the pan can be efficiently stirred with the specified number of times and time of opening with only one pressure valve with the large amount of cooked rice “QS”. Moreover, even if it is the amount of rice cooking of middle classification, the inside of a pan can be efficiently stirred with the defined opening frequency and opening time corresponding to the amount of rice cooking, and furthermore, over-stirring can be prevented.

2-2. Number of times and opening time of pressure valve in rice cooking amount QM Since this rice cooking amount QM is larger than the rice cooking amount QS, two pressure valves A and B are used, and both pressure valves are opened and closed simultaneously.

The number of times the pressure valves A and B are opened is bh1, bh2 and bh3 (bh1 ≦ bh2 ≦ bh3) for each rice cooking amount QM ₁ , QM ₂ and QM ₃ (QM ₁ <QM ₂ <QM ₃ ). ). A specific example is bh1 ≦ bh2 ≦ bh3 = 2 (times).

The opening times of both pressure valves A and B are the opening times tAH ₄ , tAH ₅ and tAH ₆ (tAH ₄ <tAH ₅ <tAH ₆ ), tBH ₄ , for each rice cooking amount QH ₁ , QM ₂ and QM ₃ . It is assumed that tBH ₅ and tBH ₆ (tBH ₄ <tBH ₅ <tBH ₆ ). For example, (tAH ₄ , tAH ₅ , tAH ₆ ) and (tBH ₄ , tBH ₅ , tBH ₆ ) are 2.0 seconds, 2.0 seconds, and 3.0 seconds.

  By this rule, in the large-class rice cooking amount “QM”, the inside of the pan can be efficiently stirred with the prescribed number of times of opening and opening time using two pressure valves. Moreover, even if it is the amount of rice cooking of middle classification, the inside of a pan can be efficiently stirred with the defined opening frequency and opening time corresponding to the amount of rice cooking.

2-3. Opening time and opening time of the pressure valve in the rice cooking amount QL Since the rice cooking amount QL is larger than the rice cooking amount QM, both the two pressure valves A and B are opened and closed at the same time as the rice cooking amount QM. Both pressure valves A and B have ch1, ch2 and ch3 (ch1 ≤ ch2 ≤ ch3) for the number of times of rice cooking QL ₁ , QL ₂ and QL ₃ (QL ₁ <QL ₂ <QL ₃ ). And A specific example is ch1 ≦ ch2 ≦ ch3 = 4 to 5 (times).

The opening times of both pressure valves A and B are tAH ₇ , tAH ₈ and tAH ₉ (tAH ₇ <tAH ₈ <tAH ₉ ), respectively, for each rice amount QL ₁ , QL ₂ and QL ₃ . It is assumed that tBH ₇ , tBH ₈ and tBH ₉ (tBH ₇ <tBH ₈ <tBH ₉ ). Specifically, (tAH ₇ , tAH ₈ , tAH ₉ ) and (tBH ₇ , tBH ₈ , tBH ₉ ) are 4.0 seconds, 5.0 seconds, and 6.0 seconds, respectively.
By this rule, in the large-class rice cooking amount “QM”, the inside of the pan can be efficiently stirred with the prescribed number of times of opening and opening time using two pressure valves. Moreover, even if it is the amount of rice cooking of middle classification, the inside of a pan can be efficiently stirred with the defined opening frequency and opening time corresponding to the amount of rice cooking.

In addition, when “white rice / kare” is selected, in the boiling maintaining step after the opening and closing operation of the pressure valve is finished, both pressure valves are cooked in the open state. By cooking rice without applying pressure, water does not penetrate into the white rice compared to the pressurized state, and hard rice is cooked.
3. "White rice, soft"
The amount of rice cooked in this rice cooking menu is also divided into large classifications QS, QM and QL as well as white rice and normal menus, and these are classified into middle classifications QS ₁ , QS ₂ and QS ₃ and QM ₁ , QM ₂ and QM _3. And QL ₁ , QL _2, and QL _3, and define the number of times and the opening time of the pressure valve.

3-1. Number of times and opening time of pressure valve in rice cooking amount QS Rice cooking amount “QS (small)” S is “QS ₁ ” for rice cooking amount “QS”, “QS ₂ ” for “medium” and “QS” for “large”, respectively. ₃ ”. These relationships are in the relationship of QS ₁ <QS ₂ <QS ₃ , and specific examples of QS ₁ , QS ₂ and QS ₃ are 0.5 cup, 1.0 cup and 1.5 cup.

  Since this rice cooking amount QS is smaller than the other rice cooking amounts QM and QL, of the two pressure valves A and B, the other pressure valve B is closed and only one pressure valve A is opened and closed.

The number of opening of the pressure valve A is as1, as2, and as3 (as1 ≦ as2 ≦ as3) for each rice cooking amount QS ₁ , QS ₂ and QS ₃ (QS ₁ <QS ₂ <QS ₃ ). ). A specific example is as1 ≦ as2 ≦ as3 = 3 (times).

The opening time of the pressure valve A is set to tAS ₁ , tAS ₂ and tAS ₃ (tAS ₁ <tAS ₂ <tAS ₃ ) for each rice cooking amount QS ₁ , QS ₂ and QS ₃ . As specific examples, tAS ₁ , tAS ₂ and tAS ₃ are 2.0 seconds, 2.5 seconds and 3.0 seconds.

3-2. Number of times and opening time of pressure valve in rice cooking amount QM Since this rice cooking amount QM is larger than the rice cooking amount QS, two pressure valves A and B are used, and both pressure valves are opened and closed simultaneously.

The number of opening of both pressure valves A and B is in the range of 1 to Nma, and the number of times of opening is bs1 for each rice quantity QM ₁ , QM ₂ and QM ₃ (QM ₁ <QM ₂ <QM ₃ ). , Bs2 and bs3 (bs1 ≦ bs2 ≦ bs3). A specific example is bs1 ≦ bs2 ≦ bs3 = 3 (times).

The opening times of both pressure valves A and B are the respective opening times tAS ₄ , tAS ₅ and tAS ₆ (tAS ₄ ≦ tAS ₅ <tAS ₆ ), for each rice cooking amount QS ₁ , QM ₂ and QM ₃ . tBS ₄ , tBS ₅ and tBS ₆ (tBS ₄ ≦ tBS ₅ <tBS ₆ ) are set. Specifically, (tAS ₄ , tAS ₅ , tAS ₆ ) and (tBS ₄ , tBS ₅ , tBS ₆ ) are 2.0 seconds, 2.0 seconds, and 3.0 seconds, respectively.

3-3. The number of opening and the opening time of the pressure valve in the rice cooking amount QL Since the rice cooking amount QL is larger than the rice cooking amount QM, both of the two pressure valves A and B are opened and closed simultaneously like the rice cooking amount QM. Both pressure valves A and B have respective opening times cs1, cs2 and cs3 (cs1 ≦ cs2 ≦ cs3) with respect to the respective rice cooking amounts QL ₁ , QL ₂ and QL ₃ (QL ₁ <QL ₂ <QL ₃ ). To. A specific example is cs1 ≦ cs2 ≦ cs3 = 3 (times). The opening time of both pressure valves A and B is the respective opening times tAS ₇ , tAS ₈ and tAS ₉ (tAS ₇ <tAS ₈ <tAS ₉ ), for each rice amount QL ₁ , QL ₂ and QL ₃ , tBS ₇ , tBS ₈ and tBS ₉ (tBS ₇ <tBS ₈ <tBS ₉ ) are set. Specifically, (tAS ₇ , tAS ₈ , tAS ₉ ) and (tBS ₇ , tBS ₈ , tBS ₉ ) are 4.0 seconds, 5.0 seconds, and 6.0 seconds, respectively.

FIG. 14 represents the relationship between the amount of rice cooked in brown rice rice, the number of times the pressure valve is opened, and the opening time.
4). Brown rice cooking The amount of rice cooking in this brown rice cooking is divided into large classification QS, QM and QL as well as the cooking menu, and these are classified into QS ₁ , QS ₂ and QS ₃ , QM ₁ , QM ₂ and QM _{3 in the} middle classification. , QL ₁ , QL _2, and QL ₃ , and define the number of times and the opening time of the pressure valve.

4-1. Opening time and opening time of pressure valve in cooked rice quantity QS (i) Opening time up to p times of opening Both pressure valves A, B are up to p times of opening, and each cooked rice quantity QS ₁ , QS ₂ and QS ₃ (QS ₁ For <QS ₂ <QS ₃ ), the respective open times are tC ₁₁ , tC ₂₁ and tC ₃₁ (tC ₁₁ ≦ tC ₂₁ ≦ tC ₃₁ ). Specifically, p = 1, tC ₁₁ , tC ₂₁ and tC ₃₁ are 3.0 seconds, 3.0 seconds and 3.0 seconds, respectively.

(Ii) Opening time until opening times p <n ≦ q times The opening time of both pressure valves A and B is based on the amount of cooked rice QS ₁ , QS ₂ and QS ₃ (QS ₁ <QS ₂ <Qs ₃ ). The respective open times are tC ₁₂ , tC ₂₂ and tC ₃₂ (tC ₁₂ ≦ tC ₂₂ ≦ tC ₃₂ ). Specifically, q = 4, tC ₁₂ , tC ₂₂ and tC ₃₂ are 3.0 seconds, 3.0 seconds and 3.0 seconds, respectively.

(Iii) Opening time q <n ≦ r ≦ Opening time The opening time of both pressure valves A and B is based on each rice cooking amount QS ₁ , QS ₂ and QS ₃ (QS ₁ <QS ₂ <QS ₃ ). , And the respective open times are tC ₁₃ , tC ₂₃ and tC ₃₃ (tC ₁₃ ≦ tC ₂₃ ≦ tC ₃₃ ). Specifically, r = 12, tC ₁₃ , tC ₂₃ and tC ₃₃ are 2.0 seconds, 2.0 seconds and 2.0 seconds, respectively.
4-2. Opening time and opening time of pressure valve in rice cooking amount QM (i) Opening time up to p opening times Both pressure valves A, B are up to p opening times, and each rice cooking amount QM ₁ , QM ₂ and QM ₃ (QM ₁ For <QM ₂ <QM ₃ ), the respective open times are tC ₄₁ , tC ₅₁ and tC ₆₁ (tC ₄₁ ≦ tC ₅₁ ≦ tC ₆₁ ). For example, p = 1, tC ₄₁ , tC ₅₁ and tC ₆₁ are 4.0 seconds, 4.0 seconds and 4.0 seconds, respectively.

(Ii) Opening time until opening times p <n ≦ q times The opening time of both pressure valves A and B is based on the amount of cooked rice QM ₁ , QM ₂ and QM ₃ (QM ₁ <QM ₂ <QM ₃ ). The respective open times are tC ₄₂ , tC ₅₂ and tC ₆₂ (tC ₄₂ ≦ tC ₅₂ ≦ tC ₆₂ ). As a specific example, q = 4, tC ₄₂ , tC ₅₂ and tC ₆₂ are 4.0 seconds, 4.0 seconds and 4.0 seconds, respectively.

(Iii) Opening time q <n ≦ r ≦ Opening time The opening time of both pressure valves A and B is based on the amount of cooked rice QM ₁ , QM ₂ and QM ₃ (QM ₁ <QM ₂ <QM ₃ ). The respective open times are tC ₄₃ , tC ₅₃ and tC ₆₃ (tC ₄₃ ≦ tC ₅₃ ≦ tC ₆₃ ). Specifically, r = 12, tC ₄₃ , tC ₅₃ and tC ₆₃ are 2.0 seconds, 2.0 seconds and 2.0 seconds, respectively.
4-3. Opening time and opening time of pressure valve in rice cooking amount QL (i) Opening time up to p opening times Both pressure valves A, B are up to p opening times, and each rice cooking amount QH ₁ , QH ₂ and QH ₃ (QH ₁ For <QH ₂ <QH ₃ ), the respective open times are tC ₇₁ , tC ₈₁ and tC ₉₁ (tC ₇₁ <tC ₈₁ ≦ tC ₉₁ ). In the specific example, p = 1, tC ₇₁ , tC ₈₁ and tC ₉₁ are 4.0 seconds, 5.0 seconds and 4.0 seconds, respectively.

(Ii) Opening time until opening times p <n ≦ q times The opening time of both pressure valves A and B is based on the amount of cooked rice QH ₁ , QH ₂ and QH ₃ (QH ₁ <QH ₂ <QH ₃ ). The respective open times are tC ₇₂ , tC ₈₂ and tC ₉₂ (tC ₇₂ > tC ₈₂ ≧ tC ₉₂ ). Specifically, p = 1, tC ₇₂ , tC ₈₂ and tC ₉₂ are 4.0 seconds, 2.0 seconds and 2.0 seconds, respectively.

(Iii) Opening time q <n ≦ r ≦ Opening time The opening time of both pressure valves A and B is based on the amount of cooked rice QH ₁ , QH ₂ and QH ₃ (QH ₁ <QH ₂ <QH ₃ ). The respective open times are tC ₇₃ , tC ₈₃ and tC ₉₃ (tC ₇₃ > tC ₈₃ ≧ tC ₉₃ ). As a specific example, r = 12, tC ₇₃ , tC ₈₃ and tC ₉₃ are 2.0 seconds, 1.0 seconds and 1.0 seconds, respectively.

Brown rice has a lower water absorption rate than white rice. The reason for this is that the surface of brown rice is covered with pericarp, seed coat, paste layer, etc., and this pericarp prevents the water from entering the rice core. According to this rice cooking method, the brown rice is rubbed and collided with each other, the skin and seed coat covering the surface of the brown rice is damaged and broken, and hot water penetrates into the core portion from the damaged and broken portion,
The endosperm, pericarp, and seed coat can be softened and swollen and cooked softly like white rice.
This method can be applied not only to brown rice but also to cereal grains.

DESCRIPTION OF SYMBOLS 1 Pressure type rice cooker 2 Rice cooker main body 3 Outer case 4 Inner case 5 Heating means 5a Pan bottom heater 5b Side heater 7 Lid locking mechanism 8 Release button 9 Pan 10 Lid 11 Inner lid 12 Large dispersion plate 13A, 13B Pressure Valve 15 Ball 17A, 17B Pressure valve release mechanism 23 Lid locking member 24 Locking member 27 Locking piece 28 Lid locking member 29 Outer lid 30 Display operation unit 31 Display panel 32 Large storage tank 33 Controller

Claims (6)

A pot for containing rice and water containing rice, a rice cooker main body provided with heating means for containing the pan and heating the rice cooker, and an openable / closable lid for closing the opening of the pot and rice cooker main body And two pressure valves disposed on the lid, the heating means and the pressure valve are controlled to perform a series of rice cooking steps including a water absorption step, a rising heating step and a boiling maintenance step, and the boiling In the maintaining step, a rice cooking program that controls the opening of the pressure valve intermittently for a predetermined number of times at a predetermined opening time, a control device having an amount determination means for determining the amount of rice cooking in the pan, and a rice cooking course / menu including rice varieties In a pressure rice cooker comprising a course selecting means for selecting, and cooking the rice by raising the inside of the pan above atmospheric pressure,
The control device includes storage means for storing the rice cooking program,
In the storage means, the selection of the pressure valve and the number of times of opening and the opening time in the boiling maintenance step are stored in correspondence with the amount of cooked rice in the pan,
In the boiling maintaining step, the control device selects one of the two pressure valves or both of the pressure valves from the storage unit according to the amount of cooked rice determined by the amount determination unit. And a valve selection / operation means for calling and operating, and a valve opening / time control means for calling and controlling the number of times and the opening time of the pressure valve selected by the valve selection / activation means from the storage means. This is a pressure rice cooker. The storage means further stores the selection of the pressure valve and the number of opening and the opening time in the boiling maintenance step in correspondence with the hardness cooking menu,
In the boiling maintaining step, the control device is further configured so that the valve selection / operation means is one of the two pressure valves according to the hardness cooking menu selected by the course selection means. 2 or 2, or both pressure valves are selected, and the valve opening number / time control means controls the number of times and the opening time of the pressure valve selected by the valve selection / actuation means. Pressure rice cooker.   When white rice is selected by the course selecting means, the valve selecting / operating means is configured such that one of the two pressure valves is closed when the amount is equal to or less than a predetermined reference rice cooking amount. A predetermined opening number and opening time are opened and closed, and when the amount of rice cooking exceeds the reference rice cooking amount, the two pressure valves are simultaneously opened and closed for a predetermined opening number and opening time. The described pressure rice cooker. In the boiling maintaining step, when the control device selects a white rice / usual menu by the course selection means,
4. The pressure rice cooker according to claim 3, wherein when the number of opening of the pressure valve exceeds a reference number, the opening time is shortened compared to the opening time before the reference number, and the pressure rice cooker is opened and closed. When the control device selects a white rice / curry menu by the course selection means, in the boiling maintenance step,
4. The pressure rice cooker according to claim 3, wherein after the pressure valve is opened and closed a predetermined number of times, the pressure valve is opened to continue the boiling maintenance process. The storage means stores the number of times and the opening time of the pressure valve in the boiling maintenance step in correspondence with brown rice,
In the boiling maintaining step, the control device further selects the pressure valve according to the brown rice selected by the course selection means, the valve opening frequency / time control means is The pressure rice cooker according to claim 1, wherein the number of times and the time of opening of the pressure valve selected by the valve selection / operation means are controlled.

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