JP4101265B2 - Pressure cooker - Google Patents

Description

  The present invention relates to a pressure rice cooker.

  The rice cooker includes a rice cooker body that accommodates the rice cooker and a lid that is attached to the rice cooker body so as to be openable and closable, and the rice cooker is heated by heating means disposed inside the rice cooker body. Thus, the rice set in the rice cooking pan is cooked. Among them, the pressure rice cooker is provided with a pressure input means having a valve body that closes the vent hole in the exhaust passage provided in the lid body, and the inside of the rice cooker is controlled to a predetermined pressure equal to or higher than the atmospheric pressure. It is said.

  Prior art document information related to the pressure rice cooker of the present invention includes the following.

JP-A-6-60960 JP 2000-14540 A JP 2003-339534 A JP 2004-57556 A

  In Patent Literature 1 to Patent Literature 3, atmospheric pressure is detected by an atmospheric pressure sensor, and the heating means and the pressure input means are controlled based on the detected value, thereby being influenced by the altitude of the place of use and changes in weather. The rice cooker which enabled the stable cooking without being described is described. Moreover, in patent document 4, the pressure in an actual rice cooker is detected with a pressure sensor, and the rice cooking which enabled stable cooking by controlling the said heating means and pressure input means based on the detected value is made possible. The vessel is described.

  However, in the rice cooker of patent documents 1 to 3, since the adjustment based on the actual pressure in the rice cooker is not performed, an ideal cooked state cannot be obtained. On the other hand, in the rice cooker of patent document 4, since adjustment based on the pressure change by the difference in altitude or the weather is not performed, an ideal cooked state cannot be obtained. Of course, if these configurations are combined, it is possible to obtain an ideal cooked state, but this leads to an increase in product size and cost.

  This invention is made in view of the conventional problem, and makes it a subject to provide the pressure rice cooker which can obtain an ideal cooking state, without becoming large sized and costly. .

In order to solve the above-mentioned problem, the first pressure rice cooker of the present invention includes a rice cooker body that houses a rice cooker, a heating unit that is provided in the rice cooker body and heats the rice cooker, and the rice cooker. A lid that is openably and closably attached to the main body, closes the rice cooker, is provided in the lid, an exhaust passage that communicates the inside and outside of the rice cooker, is provided in the lid, and the exhaust passage is Pressure-injecting means for closing and pressurizing the inside of the rice cooker, opening the exhaust passage to balance the pressure in the rice cooker with the external pressure, and temperature detecting means for detecting the temperature in the rice cooker or the rice cooker And pressure detecting means for detecting the pressure in the rice cooker, and controlling the heating means and pressure input means based on the detected values by the temperature detecting means and the pressure detecting means to preheat, raise the temperature, maintain boiling, From processes such as Murashi In the pressure cooker and control means for executing cooking control, the control means includes a detection temperature (Tn) detected by said temperature detecting means after completion of the heating process, the reference temperature set in advance (T0) And at least one of the pressure input means and the heating means is corrected and controlled so as to approach the reference temperature (T0) , and the temperature detected by the temperature detection means (Tn) and a preset reference temperature (T0) ), The detected pressure (Pn) detected by the pressure detecting means is compared with a preset reference pressure (P0), and a correction pressure (ΔP) is set based on the comparison result. set the pressure ([Delta] P) and the pressure value based on the reference pressure (P0) (Pt), complement at least one of the pressure-up means and the heating means to approach the該調pressure value (Pt) It is configured to control.

  According to the first pressure rice cooker, on the basis of the detected temperature in the rice cooker or the rice cooker, at least one of the pressure input means and the heating means is corrected and controlled so as to approach the preset temperature. The set firepower can be applied reliably. And since this temperature and pressure have a large correlation, after that, without using an atmospheric pressure sensor capable of detecting atmospheric pressure, it is possible to reliably apply the pressure as set by the differential pressure type pressure detection means. it can. Therefore, in this rice cooker, the pressure in an actual rice cooker can obtain the preset cooking state irrespective of the environment and rice cooking conditions, such as a pressure change by the difference in an altitude or the weather.

  In addition, the second pressure rice cooker is provided in the rice cooker body that accommodates the rice cooker, the heating unit that is provided in the rice cooker body, and heats the rice cooker, and is attached to the rice cooker body so as to be opened and closed. A lid that closes the rice cooking pan, an exhaust passage that is provided in the lid, communicates the inside of the rice cooking pan with the outside, and is provided in the lid, and the inside of the rice cooking pan is closed by closing the exhaust passage. Pressure applying means for pressurizing and opening the exhaust passage to balance the pressure in the rice cooker with the external pressure, temperature detecting means for detecting the temperature of the rice cooker or the rice cooker, and the pressure in the rice cooker A rice cooker comprising steps of preheating, temperature rise, boiling maintenance, unevenness, etc., by controlling the heating means and the pressure input means based on the temperature detection means and the detected values by the temperature detection means Control hand performing control A storage means for storing a plurality of rice cooking information based on detection values (Tn, Pn) of at least one of the temperature detection means and the pressure detection means, and the control means maintains the boiling A correction pressure (ΔP) is set based on a plurality of past rice cooking information stored in the storage means in the process, and a pressure adjustment value (Pt) is set based on the correction pressure (ΔP) and the reference pressure (P0). It is set so that at least one of the pressure input means and the heating means is corrected and controlled so as to approach the pressure regulation value (Pt).

  According to the second pressure rice cooker, the correction pressure (ΔP) is set based on the past rice cooking information stored in the storage means, and the pressure is adjusted based on the correction pressure (ΔP) and the reference pressure (P0). Since the value (Pt) is set and at least one of the pressure input means and the heating means is corrected and controlled so as to approach the pressure regulation value (Pt), it is possible to reliably apply the set heating power and pressure to the rice. it can. Therefore, in this rice cooker, the pressure in an actual rice cooker can obtain the preset cooking state irrespective of the environment and rice cooking conditions, such as a pressure change by the difference in an altitude or the weather.

  In this second rice cooker, the rice cooking information is detected by the temperature difference (ΔT) between the temperature (Tn) detected by the temperature detection means and a preset reference temperature (T0), or by the pressure detection means. A pressure difference (ΔP ′) between a pressure (Pn) and a preset reference pressure (P0), and the correction pressure (ΔP) is a calculated value based on an average value of a plurality of temperature differences (ΔT), or An average value of a plurality of pressure differences (ΔP ′) is preferable.

In the first and second pressure rice cookers, the pressure adjustment value (Pt) is equal to or less than a preset limit pressure (Pmax) where an added value (P0 + ΔP) of the reference pressure (P0) and the correction pressure (ΔP) is set. In some cases, the added value (P0 + ΔP) is set, and when the added value (P0 + ΔP) is higher than the limit pressure (Pmax), the limit pressure (Pmax) is preferably set. If it does in this way, the safety of a pressure rice cooker can be secured.

The pressure cooker of the present invention, based on the actual cooking conditions or past cooking conditions, to correct controlling at least one of the pressure-up means and the heating means, actual pressure cooker inside pot, differences in altitude and weather Regardless of the environment such as the pressure change due to and the cooking conditions, a preset cooking state can be obtained. Moreover, since only the differential pressure type is mounted as the pressure detecting means, it is possible to prevent the product from becoming large and expensive.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a pressure rice cooker according to an embodiment of the present invention. This pressure rice cooker includes a rice cooker body 11 that detachably accommodates a rice cooking pot 10 that is electromagnetically heated, and a lid 22 that is rotatably attached to the rice cooker body 11. In this case, the inner lid 27 is detachably attached.

  The rice cooker body 11 includes an exterior body having a cylindrical body 12 and a bottom body 13 that closes a lower end opening of the body 12. The body 12 is provided with a cylindrical inner body 14 and a protective frame 15 made of a non-conductive material below the central opening. An induction heating coil 16, which is a first heating means for induction heating the lower part of the rice cooker 10, is disposed on the lower outer peripheral surface of the protective frame 15. In addition, a drum heater 17 that is a second heating means for heating the upper portion of the rice cooking pot 10 is disposed on the outer peripheral portion of the inner drum 14. Furthermore, a rice cooker temperature sensor 18, which is a first temperature detecting means for detecting the temperature of the rice cooking pot 10, is disposed in the protective frame 15 so as to penetrate the protective frame 15. Furthermore, an operation panel 21 having an input unit composed of a plurality of switches 19 and a display unit composed of a liquid crystal panel 20 for displaying the operation status and the operation status is disposed on the upper front side of the body 12. .

  The lid body 22 is attached to the rice cooker body 11 so as to be openable and closable, and closes the opening of the rice cooker body 11. The upper plate 23 that constitutes an outer surface material together with the exterior body of the rice cooker body 11, And a lower plate 24 that closes the bottom of the upper plate 23. The lower plate 24 is provided with a heat radiating plate 25, a lid heater 26 that is a third heating means, and an inner lid 27 that closes the upper end opening of the rice cooker 10. Further, inside the lid body 22, a temperature sensor 28 for lid body that is a second temperature detecting means for detecting the temperature in the rice cooking pot 10 and outputting a signal based on the detected temperature, and the pressure in the rice cooking pot 10. And a pressure sensor 29 of a differential pressure detection system which is a pressure detection means for detecting a voltage and outputting a voltage value corresponding to the detected pressure.

  Further, the lid body 22 is provided with first and second exhaust passages 30 and 31 for communicating the inside of the rice cooker 10 with the outside, and these are added to the first exhaust passage 30 as pressure injection means. A relief valve 33 that is a pressure means is provided, and a pressure adjusting device 36 that is a pressure adjusting means is provided in the second exhaust passage 31. The exhaust passages 30 and 31 merge together on the exhaust (atmosphere) side, and the exhaust passing through these exhaust passages 30 and 31 is discharged from one exhaust port 32 provided in the upper plate 23.

The relief valve 33 has a valve seat member 34 having a cylindrical shape above the opening 30a of the first exhaust passage 30, and has a pressure adjusting ball 35 that closes the upper end opening of the valve seat member 34 by its own weight. is there. The pressure adjusting ball 35 is a metal sphere covered with polypropylene. When cooking rice, the opening of the valve seat member 34 is closed by its own weight by driving a solenoid (not shown) operated by the microcomputer 51. In this state, when the internal pressure of the rice cooker 10 exceeds 0.52 kg / cm ² (1.5 atm), for example, the rice cooker 10 floats with the steam in the rice cooker 10 and discharges the steam in the rice cooker 10 to the outside. Thereby, it is preventing that the inside of the rice cooking pot 10 becomes abnormally high pressure.

  The pressure adjusting device 36 is disposed in the opening 31a of the second exhaust passage 31, and as shown in FIGS. 2 to 4, the closing valve portion 37, the closing valve pressing portion 41, the arm portion 45, and the stepping motor. 48.

  The blocking valve portion 37 includes a blocking valve housing portion 38 and a blocking valve 39. The shut-off valve accommodating portion 38 has a cylindrical shape with upper and lower ends opened, and is fitted into a mounting hole provided in the inner lid 27 from below, and is engaged with and attached to the lower surface of the edge of the mounting hole. . An exhaust port 38 a is formed inside the shut-off valve accommodating portion 38. Further, a recess 38 b for accommodating the closing valve 39 is formed in the closing valve accommodating portion 38. Three locking claws 38 c for locking a case member 42 described later of the blocking valve pressing portion 41 are formed at the upper end of the blocking valve housing portion 38. The blocking valve 39 is disposed inside the recess 38b of the blocking valve accommodating portion 38 so as to be movable in the vertical direction. Four claw portions 39 a for locking the lower end of the spring 40 are provided on the outer periphery of the closing valve 39. Further, a shaft portion 39 b is provided on the upper surface of the closing valve 39.

  The closing valve pressing portion 41 includes a case member 42 and a pressing portion 43. The case member 42 has a substantially cylindrical shape with an open lower surface, and an insertion hole 42a through which the upper portion of the pressing portion 43 is inserted is formed on the upper surface. The case member 42 is arranged from above with respect to the closing valve portion 37, and a locking claw 42 b (shown in FIG. 3) provided on the inner surface of the side wall of the case member 42 is a locking claw of the closing valve housing portion 38. By being engaged with 38c respectively, it is attached and fixed to the upper surface of the inner lid 27. The pressing portion 43 has a cylindrical shape, and is provided with a cylindrical insertion portion 43a extending downward from the lower surface thereof. In addition, three guide pieces 43 b that protrude outward are formed at the lower portion of the pressing portion 43. The pressing portion 43 is disposed inside the case member 42, and each guide piece 43b is slidably disposed in a guide groove 42c formed on the inner surface of the side wall of the case member 42. A shaft portion 39 b of the closing valve 39 is inserted inside the insertion portion 43 a of the pressing portion 43. As a result, the pressing portion 43 is movable in the vertical direction with its upper portion protruding upward from the insertion hole 42 a of the case member 42. Further, the spring 40 is disposed between the lower surface of the pressing portion 43 and the upper surface of the blocking valve 39. The spring 40 presses the closing valve 39 downward to close the exhaust port 38a.

  The periphery of the blocking valve pressing portion 41 is covered with an elastic cap 44 made of elastic rubber or the like. The folded collar portion 44 a formed at the lower portion of the elastic cap 44 is sandwiched between the heat radiating plate 25 and the inner lid 27. A disc-shaped thick portion 44 b is integrally formed on the top of the elastic cap 44. A plurality of circulation ports 44 c are formed in the shoulder portion of the elastic cap 44.

  The arm portion 45 has an annular portion 45a formed at the center thereof, and L-shaped attachment portions 45b are provided on the lower surfaces of both sides of the annular portion 45a. The attachment portion 45b supports both ends of the pressing bar 46 having the disk-shaped portion 46a at the intermediate portion. A projecting portion 45c for turning on the micro switch 50 is provided on one side of the ring-shaped portion 45a so as to project outward when the arm portion 45 rotates counterclockwise. An arc-shaped rack 45 d that meshes with the pinion gear 48 b of the stepping motor 48 is provided at the tip of the arm portion 45. Further, on the opposite side of the arm 45 to the rack 45d, a fulcrum portion 45e having a disk shape is provided. The fulcrum portion 45e is formed with a hole 45f into which the fixed shaft 47 fixed to the arm attachment portion 49a of the motor stay 49 is fitted. The arm portion 45 configured in this manner is rotatably attached to the motor stay 49 around the fixed shaft 47, and is arranged so that the ring-shaped portion a is positioned above the elastic cap 44. As a result, the disk-shaped portion 46 a of the pressing bar 46 is brought into contact with or attached to the upper surface of the thick portion 44 b of the elastic cap 44.

  The stepping motor 48 is driven by a microcomputer 51 and is driven to rotate in both directions (forward or reverse direction) as indicated by an arrow P in FIG. The stepping motor 48 is fixed to a motor stay 49, and a pinion gear 48b is fixed to the output shaft 48a. The pinion gear 48b meshes with the rack 45d of the arm portion 45, and when the stepping motor 48 is driven to rotate in the forward direction or the reverse direction, the arm portion 45 is moved in the clockwise direction indicated by the arrow Q in FIG. Driven in a counterclockwise direction. Thereby, the said press part 43 moves to the obstruction | occlusion direction or an open | release direction along the perpendicular direction shown by the arrow R in FIG.

  The motor stay 49 is for fixing the stepping motor 48 and the arm portion 45 to the lower plate 24 with screws. The motor stay 49 is provided with a micro switch 50 so as to be positioned above the protrusion 45 c of the arm portion 45. The micro switch 50 is turned on when the projection 45c of the arm 45 abuts when the arm 45 rotates counterclockwise and the pressing portion 43 is positioned at the open position (upper end in the vertical direction). It is arranged so that.

  In the pressure adjusting device 36 configured as described above, the closing valve 39 is pressed downward by the spring 40 to close the exhaust port 38a. And if the internal pressure of the rice cooking pot 10 rises at the time of rice cooking, the block valve 39 will be pushed up against the elastic force of the spring 40 with the steam in the rice cooking pot 10, and the steam in the rice cooking pot 10 will pass through the 2nd discharge path. It is discharged outside. Further, by driving the stepping motor 48 and adjusting the vertical position of the pressing portion 43, the force for closing the exhaust port 38a by the closing valve 39 via the spring 40 can be adjusted in multiple stages.

  As shown in FIGS. 5 and 6, the pressure rice cooker having the above-described configuration is preheated, raised in temperature, maintained in boiling, and cooked according to a preset program by a microcomputer 51 which is a control means mounted on a control board (not shown). The rice cooking control which consists of processes, such as murmur, is performed, and heat retention control is performed subsequently. Specifically, in the rice cooking control, the preheating process and the temperature raising process are performed based on the detection value by the temperature sensor 18 for the rice cooking pot, which is a temperature detection means, in a non-pressurized state in which the solenoid of the relief valve 33 is in an inoperative state. Execute. Thereafter, in a pressurized state in which the relief valve 33 is operated, the boiling maintaining process, the cooking and the unevenness process are executed based on the detected value by the lid temperature sensor 28 serving as the temperature detecting means. Moreover, in this pressurized state, the operation of the pressure adjusting device 36 is operated based on the detection values of the lid temperature sensor 28 and the pressure sensor 29 which is the pressure detecting means, and the pressure in the rice cooker 10 is adjusted in multiple stages. Press.

In the present embodiment, the boiling maintenance process is divided into two types of control, a first maintenance process and a second maintenance process. Then, in the first maintenance process, the detected temperature detected by the lid temperature sensor 28 is compared with a reference temperature preset (stored) in the built-in memory 52, and the pressure adjusting device approaches the reference temperature. 36 is corrected and controlled. At this time, correction control is performed so that the value detected by the pressure sensor 29 does not exceed a preset limit pressure value. When the detected temperature matches the reference temperature, the detected pressure detected by the pressure sensor 29 is compared with a preset reference pressure. Based on the comparison result, in the subsequent second maintenance process, the pressure regulator 36 is used. The correction is controlled.

  Next, rice cooking control by the microcomputer 51 will be specifically described.

  When the user operates the rice cooking switch on the operation panel 21, the microcomputer 51 first executes a zero point correction process of the pressure sensor 29 in step S1, as shown in FIG. That is, the state before the start of rice cooking in which the relief valve 33 is off and the first exhaust passage 30 is opened is corrected and set as a zero point that is equal to atmospheric pressure.

  When this zero point correction is completed, in step S2, energization of the induction heating coil 16 is started, and a preheating process is performed in which the temperature is adjusted so that the temperature of the inner pot becomes about 50 ° C. Then, when the preheating process is completed after the preset time has elapsed, in step S3, the induction heating coil 16 is energized with 100% (full power) to execute the temperature raising process.

  Next, when the inside of the rice cooking pot 10 is heated to a predetermined temperature, the relief valve 33 is turned on and pressurization in the rice cooking pot 10 is started in step S4. After that, in step S5, a boiling maintaining process for controlling the induction heating coil 16 and the pressure regulator 36 based on the input values of the lid temperature sensor 28 and the pressure sensor 29 is executed.

  When the boiling maintenance process is completed by elapse of a preset time, in step S6, the energization amount for the induction heating coil is increased and the cooking process is executed. And if the dry-up in the rice cooking pot 10 is detected by this cooking process, electricity will be started to the lid | cover heater 26 arrange | positioned at the cover body 22 at step S7, and the unevenness process will be carried out for a predetermined time.

  Thereafter, in step S8, the relief valve 33 is turned off and the first exhaust passage 30 is opened to equilibrate the inside of the rice cooking pot 10 with the external pressure (atmosphere). And in step S9, until a user stops by operation of switch 19, or until a user takes out rice cooker 10, or until temperature falls below predetermined temperature by a power failure, a known heat retention process is performed.

  Next, the boiling maintenance process of step S5 will be specifically described. In the present embodiment, this boiling maintenance step is divided into a first maintenance process of about 7 minutes in the first half and a second maintenance process of about 8 minutes in the second half.

  In the first maintenance process, as shown in FIG. 8, the microcomputer 51 first reads the reference pressure P0 (for example, 20 kPa) and the reference temperature T0 (for example, 105 ° C.) stored in the memory 52 in step S10. In step S11, the stepping motor 48 of the pressure regulator 36 is operated to adjust the reference pressure setting position.

  Next, in step S12, the temperature Tn in the rice cooker 10 is detected by the lid temperature sensor 28, and then in step S13, it is determined whether or not the reference temperature T0 is higher than the detected temperature Tn. When the reference temperature T0 is equal to or lower than the detected temperature Tn, the process proceeds to step S14, and when the reference temperature T0 is higher than the detected temperature Tn, the process proceeds to step S18.

  In step S14, it is determined whether or not the reference temperature T0 is lower than the detected temperature Tn. If the reference temperature T0 is equal to or higher than the detected temperature Tn, that is, if the reference temperature T0 and the detected temperature Tn match, the process proceeds to step S15. If the reference temperature T0 is lower than the detected temperature Tn, the process proceeds to step S17. Proceed to

  In step S15, after the pressure Pn in the rice cooker 10 is detected by the pressure sensor 29, the atmospheric pressure difference ΔP between the detected pressure Pn and the reference pressure P0 is calculated and stored in step S16, and the process proceeds to step S21. In step S17, the stepping motor 48 is operated to adjust the pressure adjusting device 36 to reduce the pressure, and the process proceeds to step S21.

  On the other hand, if the reference temperature T0 is higher than the detected temperature Tn in step S13, the pressure Pn in the rice cooker 10 is detected by the pressure sensor 29 in step S18, and then the detected pressure Pn is a preset limit pressure Pmax. Determine if it is lower. If the detected pressure Pn is lower than the limit pressure Pmax, the process proceeds to step S20, the stepping motor 48 is operated to adjust the pressure adjustment device 36 to increase the pressure, and the process proceeds to step S21. If the detected pressure Pn is equal to or higher than the limit pressure Pmax, the process proceeds to step S16, and the atmospheric pressure difference ΔP is calculated and stored based on the detected pressure Pn, and the process proceeds to step S21.

  In step S21, it is detected whether or not the time for shifting to the second maintenance process has elapsed. If the transition time has elapsed, the process proceeds to step S22. If the transition time has not elapsed, the process returns to step S12.

  In step S22, it is detected whether or not the atmospheric pressure difference ΔP is set by passing through step S16. If the pressure difference ΔP is not set, the process proceeds to step S23, the pressure sensor 29 detects the pressure Pn in the rice cooker 10, and then the pressure difference ΔP is calculated based on the detected pressure Pn in step S24. And remember and return. If the atmospheric pressure difference ΔP has already been set, the process directly returns.

  Next, in the second maintenance process, as shown in FIG. 9, the microcomputer 51 first reads the reference pressure P0 stored in the memory 52 and the correction pressure ΔP, which is the atmospheric pressure difference, in step S30. In step S31, it is determined whether or not the added value (P0 + ΔP) is higher than the limit pressure Pmax. If the added value (P0 + ΔP) is higher than the limit pressure Pmax, the process proceeds to step S32, and the subsequent pressure adjustment value Pt is set to the limit pressure Pmax, and the process proceeds to step S34. If the added value (P0 + ΔP) is equal to or lower than the limit pressure Pmax, the process proceeds to step S33, and the subsequent pressure adjustment value Pt is set to the added value (P0 + ΔP), and the process proceeds to step S34.

  In step S34, after the actual pressure Pn in the rice cooker 10 is detected by the pressure sensor 29, it is determined in step S35 whether or not the detected pressure Pn is lower than the pressure regulation value Pt. If the detected pressure Pn is lower than the pressure regulation value Pt, the process proceeds to step S36, the stepping motor 48 is operated to increase the pressure regulating device 36, and the process proceeds to step S38. If the detected pressure Pn is greater than or equal to the pressure regulation value Pt, the process proceeds to step S37, the stepping motor 48 is operated to adjust the pressure regulation device 36 to a reduced pressure, and the process proceeds to step S38.

  In step S38, it is detected whether or not the time for shifting to the cooking process has elapsed. If the transition time has elapsed, the process returns. If the transition time has not elapsed, the process returns to step S34. In addition, also after performing this boiling maintenance process and performing the subsequent cooking process and unevenness process, the said correction pressure (DELTA) P is added to a reference pressure, and control is performed similarly.

  Thus, in the pressure rice cooker of this embodiment, based on the detected temperature in the rice cooker 10, since the pressure regulating apparatus 36 is correction-controlled so that it may approach preset temperature, it is surely as set with respect to rice. You can add more firepower. Since the temperature and the pressure have a large correlation, the pressure as set can be reliably applied by the differential pressure type pressure sensor 29 without using an atmospheric pressure sensor capable of detecting atmospheric pressure.

  For example, the atmospheric pressure at an altitude of 1000 m is reduced by 100 hP as compared to a standard land of 0 m. And when the boiling point is different by 1 hP, it decreases by 0.027 ° C. That is, the boiling point is about 97.3 ° C. On the other hand, in the boiling maintenance step, when the pressurization into the rice cooker 10 is controlled to 20 kP, the boiling point is usually 105.4 ° C., but is 102.7 ° C. at a high altitude of 1000 m.

And in this embodiment, the pressure in the actual rice cooker 10 is adjusted to altitude and weather by carrying out correction control so that the actual temperature approaches the reference temperature set with reference to the standard ground by the first maintenance control. Regardless of the environment such as pressure change due to the difference between the two and the rice cooking conditions, a preset cooking state can be obtained. Moreover, since only the differential pressure type is mounted as the pressure detecting means, it is possible to prevent the product from becoming large and expensive. Of course, in the correction control, since control is performed so as not to exceed a preset limit value (steps S19 and S31), safety can be ensured.

  FIG. 10: shows the flowchart of the boiling maintenance process in the pressure rice cooker of 2nd Embodiment. In the second embodiment, the boiling maintenance step is not divided into the first half and the second half. And it is greatly different from 1st Embodiment by the point which carried out correction | amendment control of the pressure regulation apparatus 36 based on the rice cooking information cooked in the past memorize | stored in the memory 52 immediately after starting this boiling maintenance process. .

  Specifically, the microcomputer 51 of the second embodiment first calculates the correction pressure ΔP based on the past rice cooking information stored in the memory 52 in step S50 in the boiling maintenance process in step S5 of FIG. Execute. Thereafter, in step S51, the reference pressure P0 and the reference temperature T0 stored in the memory 52 are read.

  Next, in step S52, it is determined whether or not the added value (P0 + ΔP) of the reference pressure P0 and the calculated correction pressure ΔP is higher than the limit pressure Pmax. If the added value (P0 + ΔP) is higher than the limit pressure Pmax, the process proceeds to step S53, and the subsequent pressure adjustment value Pt is set to the limit pressure Pmax, and the process proceeds to step S55. If the added value (P0 + ΔP) is equal to or lower than the limit pressure Pmax, the process proceeds to step S54, and the subsequent pressure adjustment value Pt is set to the added value (P0 + ΔP), and the process proceeds to step S55.

  In step S55, after the actual pressure Pn in the rice cooker 10 is detected by the pressure sensor 29, it is determined in step S56 whether or not the detected pressure Pn is lower than the pressure regulation value Pt. If the detected pressure Pn is lower than the pressure regulation value Pt, the process proceeds to step S57, the stepping motor 48 is operated to adjust the pressure regulating device 36 to increase the pressure, and the process proceeds to step S59. If the detected pressure Pn is greater than the pressure regulation value Pt, the process proceeds to step S58, the stepping motor 48 is operated to adjust the pressure regulation device 36 to a reduced pressure, and the process proceeds to step S59.

  In step S59, it is detected whether or not the time for shifting to the cooking process has elapsed. When the transition time has elapsed, the process proceeds to step S60, and when the transition time has not elapsed, the process returns to step S55.

  In step S60, after the temperature Tn in the rice cooker 10 is detected by the lid temperature sensor 28, a temperature difference ΔT with respect to the reference temperature T0 is calculated in step S61, and the temperature difference ΔT is stored in the memory 52 in step S62. Remember and return. Here, in the present embodiment, the memory 52 can store the past 10 temperature difference data ΔT as the rice cooking information. That is, when the temperature difference data ΔT for 10 times is already stored at present, the oldest temperature difference data ΔT9 before 10 times is deleted, and the current temperature difference data ΔT0 is newly updated and stored. Yes.

  Next, in the correction pressure ΔP calculation process of step S50, the microcomputer 51 first reads the temperature difference data ΔT for the past 10 times stored in the memory 52. Then, among these, the average value of the temperature difference data ΔT for eight times excluding the data with the largest temperature difference and the data with the smallest temperature difference is calculated. Then, based on the correlation between temperature and pressure described in the first embodiment, a correction pressure ΔP is calculated from the calculated average temperature.

  In the initial purchase of the pressure cooker, 0 (zero) is stored in the memory 52 as the initial value of the temperature difference data ΔT for the past 10 times, and the calculation is performed using the initial value.

In the pressure rice cooker of the second embodiment, a pressure difference is calculated based on past rice temperature difference information stored in the memory 52, and the pressure regulator 36 is adjusted so that the pressure difference is reduced based on the calculated value. Since correction control is performed, as in the first embodiment, it is possible to reliably apply the set heating power and pressure to the rice. Therefore, the cooked state set in advance can be obtained regardless of the actual pressure in the rice cooker 10 regardless of the environment and the cooking conditions, such as pressure changes due to differences in altitude and weather.

  In addition, the pressure rice cooker of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, in the above-described embodiments, the pressure adjusting device 36 is corrected and controlled. However, the heating amount by the induction heating coil 16 may be corrected and controlled instead of the pressure adjusting device 36, or both may be corrected and controlled. Good.

  In the first embodiment, the boiling maintenance process is divided into the first maintenance process and the second maintenance process, and the respective transition (execution) times are set in advance, but the transition time in each process is not set, Only the transition time of the whole boiling maintenance process may be set in advance. In this case, as shown in FIG. 11, in the first maintenance process, steps S21 to S24 in the embodiment are not necessary. And if step S17 and step S20 are performed, it will return to step S12 as it is. In step S19 ′, when the detected pressure Pn is equal to or higher than the limit pressure Pmax, the safety is improved by proceeding to step S17.

Furthermore, in 2nd Embodiment, although the temperature difference (DELTA) T of the actual temperature Tn in the rice cooking pot 10 and the reference temperature T0 was memorize | stored as rice cooking information, the pressure of the actual pressure Pn in the rice cooking pot 10 and the reference pressure P0. The difference ΔP ′ may be stored, and the average value may be used as the correction pressure ΔP .

It is the schematic which shows the pressure rice cooker which concerns on embodiment of this invention. It is the perspective view which fractured | ruptured a part of cover body. (A) is sectional drawing of a pressure regulating device, (B) is a top view. It is a disassembled perspective view of a pressure regulating device. It is a block diagram which shows the structure of a pressure rice cooker. It is a graph which shows the rice cooking control by a microcomputer. It is a flowchart which shows the rice cooking control by a microcomputer. It is a flowchart which shows the 1st maintenance process of the boiling maintenance process of 1st Embodiment. It is a flowchart which shows the 2nd maintenance process of the boiling maintenance process of 1st Embodiment. It is a flowchart which shows the boiling maintenance process of 2nd Embodiment. It is a flowchart which shows the modification of the 1st maintenance process of 1st Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Rice cooker 11 ... Rice cooker main body 16 ... Induction heating coil (1st heating means)
17 ... Body heater (second heating means)
18 ... Rice cooker temperature sensor (temperature detection means)
22 ... Lid 26 ... Lid heater (third heating means)
28 ... Temperature sensor for lid (temperature detection means)
29 ... Pressure sensor (pressure detection means)
30 ... 1st exhaust passage 31 ... 2nd exhaust passage 33 ... Relief valve (pressure injection means)
36 ... Pressure regulator (pressure input means)
51. Microcomputer (control means)
52 ... Memory (storage means)

Claims (4)

A rice cooker body containing a rice cooker;
A heating means provided in the rice cooker body for heating the rice cooker;
A lid that is attached to the rice cooker body so as to be openable and closable, and closes the rice cooker;
An exhaust passage provided in the lid body and communicating between the inside of the rice cooker and the outside;
A pressure input means provided in the lid, pressurizing the rice cooking pot by closing the exhaust passage, and opening the exhaust passage to balance the pressure in the rice cooking pot with an external pressure;
Temperature detecting means for detecting the temperature of the rice cooker or the rice cooker;
Pressure detecting means for detecting the pressure in the rice cooker;
Control means for controlling the heating means and the pressure input means based on the detection values by the temperature detection means and the pressure detection means to perform rice cooking control comprising steps such as preheating, temperature rise, boiling maintenance, and unevenness. In the pressure cooker provided,
Said control means, said detection temperature (Tn) detected by said temperature detecting means after completion of the heating step, compares the reference temperature (T0) that is set in advance, the closer to the reference temperature (T0) When at least one of the pressure input means and the heating means is corrected and controlled, and the detected temperature (Tn) by the temperature detecting means matches the preset reference temperature (T0),
The detected pressure (Pn) detected by the pressure detecting means is compared with a preset reference pressure (P0), a correction pressure (ΔP) is set based on the comparison result, and the correction pressure (ΔP) and the reference pressure are set. A pressure adjustment value (Pt) is set based on the pressure (P0), and at least one of the pressure input means and the heating means is corrected and controlled so as to approach the pressure adjustment value (Pt). rice cooker. A rice cooker body containing a rice cooker;
A heating means provided in the rice cooker body for heating the rice cooker;
A lid that is attached to the rice cooker body so as to be openable and closable, and closes the rice cooker;
An exhaust passage provided in the lid body and communicating between the inside of the rice cooker and the outside;
A pressure input means provided in the lid, pressurizing the rice cooking pot by closing the exhaust passage, and opening the exhaust passage to balance the pressure in the rice cooking pot with an external pressure;
Temperature detecting means for detecting the temperature of the rice cooker or the rice cooker;
Pressure detecting means for detecting the pressure in the rice cooker;
Control means for controlling the heating means and the pressure input means based on the detection values by the temperature detection means and the pressure detection means to perform rice cooking control comprising steps such as preheating, temperature rise, boiling maintenance, and unevenness. In the pressure cooker provided,
A storage means for storing a plurality of rice cooking information based on at least one of the detected values (Tn, Pn) of the temperature detection means and the pressure detection means;
The control means sets a correction pressure (ΔP) based on a plurality of past rice cooking information stored in the storage means in the boiling maintenance step, and based on the correction pressure (ΔP) and a reference pressure (P0). A pressure cooker characterized in that a pressure regulation value (Pt) is set and at least one of the pressure input means and the heating means is corrected and controlled so as to approach the pressure regulation value (Pt) . The rice cooking information is preset as a temperature difference (ΔT) between a temperature (Tn) detected by the temperature detection means and a preset reference temperature (T0), or a pressure (Pn) detected by the pressure detection means. Pressure difference (ΔP ′) from the reference pressure (P0),
The correction pressure (ΔP) is an arithmetic value based on an average value of a plurality of temperature differences (ΔT) or an average value of a plurality of pressure differences (ΔP ′). Pressure cooker. The pressure adjustment value (Pt) is the addition value (P0 + ΔP) when the addition value (P0 + ΔP) of the reference pressure (P0) and the correction pressure (ΔP) is equal to or less than a preset limit pressure (Pmax). The pressure rice cooker according to any one of claims 1 to 3 , wherein when the added value (P0 + ΔP) is higher than a limit pressure (Pmax), the limit pressure (Pmax) is set.

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