TWI709384B - Rice cooker - Google Patents

Abstract

Equipped with: the main body of the rice cooker, the pot contained in the main body of the rice cooker, the heating part of the heating pot, the pressure adjustment part that adjusts the pressure in the pot, and the control part that controls the heating part and the pressure adjustment part. The control part is in the boiling maintenance step, The first pressure adjustment step, the second pressure adjustment step, and the third pressure adjustment step will be performed sequentially. The first pressure adjustment step is a step of increasing the pressure in the pot from the first pressure to the second pressure, and then reducing the pressure to the first pressure. The second pressure adjustment step is a step of increasing the pressure in the pot from the first pressure to a third pressure lower than the second pressure, and then reducing the pressure to the first pressure. The third pressure adjusting step is a step of increasing the pressure in the pot from the first pressure to a fourth pressure higher than the third pressure and lower than the second pressure, and then reducing the pressure to the first pressure.

Description

Rice cooker

FIELD OF THE INVENTION The present invention relates to a rice cooker.

BACKGROUND OF THE INVENTION In the past, among such rice cookers, as shown in Japanese Patent Laid-Open No. 2004-081824, in order to cook the rice evenly, and to make the upper surface of the cooked rice flat and visual The above delicacy effect proposes a configuration in which the pressure in the boiling pan is changed in the boiling maintenance step in which the material to be cooked in the pan reaches the boiling temperature by heating.

Specifically, as shown in FIG. 8, a conventional rice cooker is equipped with: a pot 200, which contains a cooking object containing water and rice, a heating part 201, and a heating part, the cooking object in the heating pot 200, and a lid 202. The opening of the pot 200 and the pressure valve 204 are blocked by an opening and closing mechanism for connecting or blocking the pot 200 and the outside air in order to make the pressure in the pot 200 a substantially constant predetermined pressure. Furthermore, it is equipped with: a pressure valve opening device 203, which is attached to the pressure valve 204 and is used to force the pressure valve 204 to be in an open state, and a control unit 205, which controls the heating amount of the heating unit 201 and performs via the pressure valve opening device 203 Control of the opening action of the pressure valve 204.

Moreover, as shown in FIG. 9, in the conventional rice cooker, the control unit 205 controls the pressure valve 204 through the pressure valve opening mechanism 203 in the boiling maintenance step in which the material to be cooked in the pot 200 reaches the boiling temperature by heating. The opening and closing are activated, and the increase and decrease of the pressure in the boiling pot 200 are alternately repeated, so that the pressure in the pot 200 gradually rises. Then, when the pressure in the pot 200 becomes a predetermined pressure, control is performed to maintain the pressure in the pot 200 at the predetermined pressure. According to this structure, the conventional rice cooker rapidly changes the pressure in the pot 200, and causes a violent boiling phenomenon (sudden boiling phenomenon) in the pot 200, and the rice grains in the pot 200 are vigorously stirred and mixed by the sudden boiling phenomenon Therefore, the heating of the rice grains can be uniformly averaged, the uneven cooking is eliminated, and the shape of the upper surface of the cooked rice is flattened.

SUMMARY OF THE INVENTION However, in the conventional rice cookers, there is still room for improvement from the viewpoint of enhancing the taste of cooked rice.

In other words, in the conventional rice cooker, the control unit changes the pressure in the pot by opening and closing the pressure valve several times at regular intervals in the boiling maintenance step. In addition, in the conventional rice cooker, in the boiling maintaining step, the control unit opens and closes the pressure valve so that the change in the pressure in the pot becomes constant and the pressure in the pot gradually rises.

As described above, in the conventional rice cooker, since the pressure change in the boiling maintenance step is small and uniform, it may not be possible to sufficiently stir the rice in the pot by the sudden boiling phenomenon caused by the pressure change in the pot. Therefore, in the boiling maintenance step, the rice soup that is the source of the deliciousness of the rice may not be sufficiently produced, and the taste of the cooked rice may not be improved.

The present invention provides a rice cooker which can increase the production of rice soup, which is the source of the delicacy of rice, and enhance the taste of cooked rice.

The present invention is provided with: a rice cooker body and a pot, which are housed in the rice cooker body and contain water and rice to be cooked, and a heating part, which is arranged in the rice cooker body, and heats the pot and a pressure regulating part, and adjusts the inside of the pot The pressure and control part is to control the heating part and the pressure adjustment part. In addition, the control unit executes a cooking step including a temperature increase step and a boiling maintenance step. The aforementioned temperature increase step is to control the heating unit to heat the pot and boil the object to be cooked in the pot. The aforementioned boiling maintenance step is to control the heating unit to heat the pot. Heat and maintain the boiled state of the cooked material contained in the pot. In addition, in the boiling maintenance step, the control unit will control the pressure adjustment unit to increase the pressure in the pot from the first pressure to a second pressure higher than the first pressure, and then reduce the pressure from the second pressure to the first pressure. The first pressure adjustment step of pressure. In addition, the control unit will increase the pressure in the pot from the first pressure to a third pressure higher than the first pressure and lower than the second pressure, and then reduce the pressure from the third pressure to the second pressure of the first pressure Adjustment steps. In addition, the control unit will increase the pressure in the pot from the first pressure to a fourth pressure higher than the third pressure and below the second pressure, and then reduce the pressure from the fourth pressure to the third pressure of the first pressure Adjustment steps. Furthermore, in the boiling maintenance step, the control unit executes the second pressure adjustment step after the first pressure adjustment step, and executes the third pressure adjustment step after the second pressure adjustment step.

According to this configuration, in the boiling maintenance step, since the cooked material in the pot can be stirred sufficiently, the production of the rice soup that is the source of the deliciousness of the rice can be increased, and the taste of the cooked rice can be enhanced.

Detailed Description of Preferred Embodiments Hereinafter, the preferred embodiment of the rice cooker of the present invention will be described in detail with reference to the drawings. In addition, in the following description, the same reference numerals will be attached to the same or corresponding parts, and repeated descriptions will be omitted. (First Embodiment)

The rice cooker in the first embodiment of the present invention will be described with reference to FIGS. 1 to 6.

Fig. 1 is an overall perspective view showing the rice cooker in the first embodiment of the present invention. Fig. 2 is an exploded perspective view showing the rice cooker in the first embodiment of the present invention. Fig. 3 is an overall cross-sectional view showing the rice cooker in the first embodiment of the present invention. Fig. 4A is a bottom perspective view showing the form of the inner cover of the rice cooker in the first embodiment of the present invention viewed from the pot side. Fig. 4B is a top perspective view showing the form of the inner cover of the rice cooker in the first embodiment of the present invention viewed from the cover body side. Fig. 5 is an exploded perspective view showing the pressure adjusting part of the rice cooker in the first embodiment of the present invention. 6 is a graph showing changes in the temperature and pressure in the pot in the cooking step of the rice cooker in the first embodiment of the present invention.

As shown in Figures 1 to 3, the rice cooker 100 of this embodiment includes a rice cooker main body 1, a pot 2, which is housed in the rice cooker main body 1, and houses a cooking object containing water and rice, and a lid 3, which is installed In the cooker body 1. In addition, the heating unit 4 is arranged in the main body 1 of the rice cooker, the heating pot 2 and the pressure adjusting portion 5 are formed by the pressure adjusting valve portion 15 and the pressure adjusting valve driving portion 19 described later, and the pot 2 can be adjusted. The internal pressure and control unit 6 controls the heating unit 4 and the pressure adjustment unit 5.

A pot accommodating portion 1a for accommodating a pot 2 is formed in the rice cooker body 1. Heating coils are arranged in the bottom surface and side surfaces of the outer periphery of the pot accommodating portion 1a, and the heating coil forms a heating portion for heating the pot 2. In addition, a temperature sensor 1b is arranged in the bottom surface of the pot accommodating portion 1a. The temperature sensor 1b is in contact with the bottom surface of the pot 2 when the pot 2 is accommodated in the pot accommodating portion 1a, and detects The temperature of the pot 2 and the temperature of the pot 2 detected by the temperature sensor 1b are used to detect the temperature of the cooked object in the pot 2.

In addition, in this embodiment, although the structure in which the heating part 4 is formed by a heating coil capable of induction heating the pot 2 is described, as long as the heating part 4 can heat the pot 2 accommodated in the pot accommodating part 1a That is, for example, it may be a structure in which the heating unit 4 is formed by an electrical resistance heater.

The pot 2 is formed in a bottomed shape having an opening 2a on the upper side. Moreover, the pot 2 is detachably accommodated in the pot accommodating part 1a formed in the main body 1 of a rice cooker.

The lid 3 is rotatably attached to a lid mounting portion 1c formed at the rear of the rice cooker 1. On the front part of the upper surface of the lid 3 is arranged an operating part 7 (the part enclosed by a dotted line in Figs. 1 and 2) for setting the cooking mode of the cooked food into the pot 2 by the user, etc. The cooking conditions and the display unit 8 display the cooking conditions set by the operation unit 7. In addition, at the rear of the upper surface of the lid 3, a steam drum accommodating portion 3a is formed to detachably house the steam drum 9. The steam drum 9 discharges the steam generated in the pot 2 to the outside of the rice cooker 100.

The steam drum 9 is composed of a steam drum main body 9a having an opening (not shown) on the upper side, and a steam drum cover 9b that can open and close the opening (not shown) of the steam drum main body 9a. In the steam drum main body portion 9a, a steam inflow port 9c is formed to allow the steam generated in the pot 2 to flow into the steam drum 9. In the steam drum cover portion 9b, a steam outflow port 9d that discharges the steam flowing into the steam drum 9 from the steam inflow port 9c to the outside of the steam drum 9 is formed.

In the inner side of the lid 3, an inner lid 10 is detachably mounted. The inner lid 10 closes the opening of the pot 2 contained in the rice cooker body 1 when the lid 3 is closed relative to the rice cooker body 1部2a.

As shown in FIGS. 4A and 4B, the inner lid 10 has: a ring-shaped first sealing member 12, which is a state in which the inner lid 10 is attached to the lid body 3 and the lid body 3 is in a closed state with respect to the cooker body 1 Bottom, abutting the upper end of the pot 2 to maintain the airtightness between the pot 2 and the inner lid 10, the metal heating plate 11 and the annular heating plate supporting member 13 are installed on the pot 2 side of the heating plate 11. The first sealing member 12 is held by being sandwiched between the outer circumference of the heating plate 11 and the inner circumference of the heating plate supporting member 13.

The heating plate 11 is formed with a first steam outlet 11a, which discharges steam generated in the pot 2 to the outside of the pot 2, and is opened and closed by a pressure regulating valve 15b described later, and a second steam outlet 11b. The steam generated in the pot 2 is discharged to the outside of the pot 2, and is opened and closed by the pressure suppression valve 16b described later, and the third steam outlet 11c is to discharge the steam generated in the pot 2 to the outside of the pot 2. , And opened and closed by the safety valve 17b described later. In addition, a rice soup return port 11d is formed to discharge rice to the outside of the pot 2 from the first steam outlet 11a, the second steam outlet 11b, and the third steam outlet 11c along with the steam generated in the pot 2. The soup returns to the inside of pot 2. Here, rice soup refers to a soup made by dissolving viscous components such as starch contained in rice in water, and is a soup produced by boiling rice with viscosity.

A valve accommodating portion 14 is arranged on the lid 3 side of the heating plate 11. The valve accommodating part 14 has a pressure regulating valve accommodating part 15a that houses a pressure regulating valve 15b that opens and closes the first steam discharge port 11a, and a pressure control valve accommodating part 16a that houses a pressure suppression valve 16b that opens and closes the second steam discharge port 11b. In addition, the valve accommodating portion 14 has: a safety valve accommodating portion 17a accommodating a safety valve 17b that opens and closes the third steam outlet 11c, and a rice soup return valve mounting portion 18a that is equipped with a rice soup return valve 18b that opens and closes the rice soup return port 11d .

A second sealing member 14a is arranged on the outer periphery of the valve housing portion 14 to maintain the airtightness between the heating plate 11 and the valve housing portion 14 when the valve housing portion 14 is mounted on the lid 3 side of the heating plate 11 Sex. In addition, the second sealing member 14a is configured to abut the lid body 3 in a state where the inner lid 10 is attached to the lid body 3 and maintain the airtightness between the valve accommodating portion 14 and the lid body 3. With this structure, the steam discharged to the outside of the pot 2 from the first steam discharge port 11a, the second steam discharge port 11b, and the third steam discharge port 11c is guided to the steam drum 9 from the steam inlet 9c of the steam drum 9 internal. Furthermore, the second sealing member 14a prevents the steam generated in the pot 2 from flowing from the pot 2 to the steam tube 9 when the steam is discharged from the steam outlet 9d of the steam drum 9 to the outside of the steam drum 9 (Figure Not shown) leakage. Moreover, the second sealing member 14a is discharged to the outside of the pot 2 together with the steam generated in the pot 2, and the rice soup stored in the steam drum 9 flows from the rice soup outflow port formed in the steam drum 9 (not shown) Shown) When the rice soup return port 11d returns to the pot 2, the rice soup return path (not shown) from the steam cylinder 9 to the pot 2 can be prevented from leaking.

In the pressure control valve housing portion 15a, a pressure control valve 15b that opens and closes the first steam discharge port 11a is arranged. The pressure regulating valve 15b is arranged in the pressure regulating valve accommodating portion 15a so as to obtain an open position where the first steam discharge port 11a is configured in an open state and a closed position where the first vapor discharge port 11a is configured in a closed state. The accessible opening position of the pressure regulating valve 15b refers to the pressure adjustment in which the steam generated in the pot 2 can be discharged from the first steam outlet 11a to the outside of the pot 2, and the first steam outlet 11a is configured to be in an open state The position of the valve 15b. In addition, the closing position that the pressure regulating valve 15b can obtain means that the steam generated in the pot 2 can be discharged from the first steam outlet 11a to the outside of the pot 2, and the first steam outlet 11a is configured to be closed. The position of the pressure regulating valve 15b. In addition, a first spring 15c that imparts potential energy to position the pressure control valve 15b in the closed position is arranged in the pressure control valve accommodating portion 15a. The pressure regulating valve 15b is configured to be held in the closed position by the force of the potential energy of the first spring 15c, and will resist the force of the potential energy of the first spring 15c, by means of the pressure regulating valve drive part described later in FIG. 5 19 The pressure regulating valve 15b is pressed to move from the closed position to the open position. Furthermore, it is comprised so that the pressure adjustment valve 15b may be maintained in an open position by the pressing force of the pressure adjustment valve drive part 19. That is, when the pressure regulating valve 15b is not pressed by the pressure regulating valve drive part 19, it is located in a closed position, and the 1st steam discharge port 11a is comprised in the closed state by this. Furthermore, when pressed by the pressure regulating valve drive unit 19, the pressure regulating valve 15b moves from the closed position to the open position and is located in the open position, thereby configuring the first steam outlet 11a to be in an open state. In this way, in this embodiment, the pressure regulating valve 15b of the first steam discharge port 11a is opened and closed, the first spring 15c that imparts potential energy so that the pressure regulating valve 15b is in the closed position, and the pressure regulating valve 15b and the first spring are accommodated. The pressure regulating valve housing portion 15a of 15c forms the pressure regulating valve portion 15.

In the pressure suppression valve part 16, the pressure suppression valve 16b which opens and closes the 2nd steam discharge port 11b is arrange|positioned. The pressure suppression valve 16b is arranged in the pressure suppression valve accommodating portion 16a so as to obtain an open position where the second steam discharge port 11b is configured in an open state and a closed position where the second vapor discharge port 11b is configured in a closed state. The open position that the pressure suppression valve 16b can take is the pressure suppression in order that the steam generated in the pot 2 can be discharged from the second steam discharge port 11b to the outside of the pot 2, and the second steam discharge port 11b is configured as an open state The position of the valve 16b. In addition, the closing position that the pressure suppression valve 16b can obtain means that the second steam outlet 11b is configured to be closed so that the steam generated in the pot 2 can be discharged from the second steam outlet 11b to the outside of the pot 2 The position of the pressure suppression valve 16b. The pressure suppression valve 16b is given potential energy to the blocking position by the potential energy of a spring (not shown) arranged in the pressure suppression valve accommodating portion 16a, and is maintained in the blocking position. The pressure suppression valve 16b is in the pot When the pressure in 2 becomes a pressure equal to or higher than the first threshold value, the pressure in the pot 2 moves from the closed position to the open position and remains at the open position. That is, the pressure suppression valve 16b is in the closed position when the pressure in the pot 2 is lower than the first threshold value, thereby configuring the second vapor discharge port 11b to be in a closed state. In addition, the pressure suppression valve 16b is configured to move from the closed position to the open position by the pressure in the pan 2 when the pressure in the pot 2 becomes a pressure threshold greater than the first threshold value, and maintain the open position, thereby The second steam outlet 11b is configured to be an open state so that the pressure in the pot 2 does not become a pressure higher than the first threshold value. Furthermore, the first threshold value of the pressure at which the pressure suppression valve 16b is moved from the closed position to the open position may be set to be equal to or greater than the upper limit value of the pressure range adjusted by the pressure adjustment valve portion 15, and only The diameter of the second steam discharge port 11b or the spring constant of a spring (not shown) that applies potential energy to the pressure suppression valve 16b may be set in accordance with the first threshold. In this way, in this embodiment, the pressure control valve 16b of the second steam discharge port 11b is opened and closed, and the spring (not shown) that imparts potential energy so that the pressure control valve 16b is in the closed position accommodates the pressure control valve 16b and the spring ( The pressure suppression valve accommodating portion 16a of (not shown) forms the pressure regulating valve portion 16.

In the safety valve portion 17, a safety valve 17b that opens and closes the third steam discharge port 11c is arranged. The safety valve 17b is arranged in the pressure safety valve accommodating portion 17a so as to obtain an open position where the third steam discharge port 11c is configured in an open state and a closed position where the third vapor discharge port 11c is configured in a closed state. The accessible opening position of the safety valve 17b refers to a safety valve in which the third steam discharge port 11c is configured as an open state so that the steam generated in the pot 2 can be discharged from the third steam outlet 11c to the outside of the pot 2 The location of 17b. In addition, the accessible closing position of the safety valve 17b means that the third steam outlet 11c is configured to be in a closed state so that the steam generated in the pot 2 can be discharged from the third steam outlet 11c to the outside of the pot 2. The position of the safety valve 17b. The safety valve 17b is given potential energy to the closed position by the potential energy of a spring (not shown) arranged in the safety valve accommodating portion 17a, and is maintained in the closed position. The safety valve 17b is in the pot 2 When the pressure becomes a pressure equal to or greater than the second threshold value higher than the first threshold value, the pressure in the pot 2 moves from the closed position to the open position and is maintained at the open position. That is, the safety valve 17b is in the closed position when the pressure in the pot 2 is lower than the second threshold value, thereby configuring the third steam outlet 11c to be in a closed state. In addition, the safety valve 17b is configured such that when the pressure in the pot 2 becomes a pressure higher than the second threshold that is higher than the first threshold for operating the pressure suppression valve portion 16, the pressure in the pot 2 moves from the closed position to The open position is moved and maintained at the open position, whereby the third steam outlet 11c is configured to be an open state, and the pressure in the pot 2 does not become a pressure higher than the second threshold value. In addition, the second threshold value, which is the threshold value of the pressure for moving the safety valve 17b from the closed position to the open position, needs to be set higher than the first threshold value for operating the pressure suppression valve unit 16 and set corresponding to the second threshold value. The diameter of the third steam discharge port 11c or the spring constant of a spring (not shown) that imparts potential energy to the safety valve 17b may be used. In this way, in this embodiment, the safety valve 17b of the third steam outlet 11c is opened and closed, the spring (not shown in the figure), the safety valve 17b and the spring (not shown in the figure) that are applied with potential energy so that the safety valve 17b is in the closed position The safety valve receiving portion 17a shown) forms the safety valve portion 17.

The rice soup return valve installation part 18a is provided with a rice soup return valve 18b that opens and closes the rice soup return port 11d. The rice soup return valve 18b is attached to the rice soup return valve installation portion 18a from the pot 2 side of the heating plate 11. The rice soup return valve 18b is configured to open and close the rice soup return port 11d corresponding to the weight of the rice soup stored in the rice soup return valve mounting portion 18a of the valve housing portion 14 and the pressure in the pot 2. That is, the rice soup return valve 18b installed on the rice soup return valve installation part 18a from the pot 2 side of the heating plate 11 will go to the rice soup return port 11d by the pressure in the pot 2 when the pressure in the pot 2 is high. By pressing sideways, it is configured to block the rice soup return port 11d. When the pressure in the pot 2 is low, the weight of the rice soup itself stored in the rice soup return valve installation part 18a of the valve accommodating part 14 will cause the rice soup return valve 18b to move away from the rice soup return port 11d to the side of the pot 2 , And the structure is an open state where the rice soup return port 11d is opened. Then, the rice soup stored in the rice soup return valve attachment portion 18a of the valve accommodating portion 14 is returned to the pot 2 from the rice soup return port 11d. In this way, in this embodiment, the rice soup return valve 18b and the rice soup return valve mounting portion 18a to which the rice soup return valve 18b is mounted constitute the rice soup return valve portion 18.

As shown in FIGS. 3 and 5, a pressure regulating valve driving unit 19 is arranged inside the lid 3, and the pressure regulating valve driving unit 19 moves the pressure regulating valve 15b until the first steam outlet 11a is configured to be closed. The closed position in the state and the open position in the open state.

The pressure regulating valve driving unit 19 includes a moving unit 20 that moves from an opening (not shown) formed in the cover 3 to the pressure regulating valve unit 15 side, and moves the pressure regulating valve 15b from the closed position to the open position. In addition, the pressure regulating valve drive unit 19 includes a drive unit 21 for moving the moving unit 20, a transmission unit 22 for transmitting the driving force of the drive unit 21 to the moving unit 20, a cover 23 for holding the drive unit 21 and the transmission unit 22, The box part 24 that houses the moving part 20 and the cover part 23.

The moving part 20 is composed of a pressing part 20b, a moving part body 20a, a second spring 20d, and a plug 20e. The pressing part 20b is formed at one end and is pressed through a packing (not shown) Pressure regulating valve 15b; the moving part main body 20a is formed with an insertion port 20c and connected to the pressing part 20b; the second spring 20d is arranged on the outer periphery of the moving part main body 20a; the latch 20e is an insertion port into which the moving part main body 20a is inserted 20c.

The moving portion main body 20a is formed such that the diameter of the pressing portion 20b is larger than the diameter of the second spring 20d, and the pressing portion 20b is formed at the end portion on the pressure regulating valve 15b side. The second spring 20d is held on the outer periphery of the moving part body 20a by abutting one end of the pressing part 20b and the other end abutting the plug 20e attached to the insertion port 20c of the moving part body 20a. In addition, the moving part 20 is held by the box part 24 by the plug 20e attached to the other end of the moving part main body 20a, and is held by the box part 24 by the plug 20e.

The driving part 21 is composed of a driving motor 21a and a driving gear 21c attached to a rotating shaft 21b of the driving motor 21a. In addition, the driving part 21 is held by the cover part 23 by attaching the driving motor 21a to the outer side of the cover part 23 with a screw or the like.

The transmission portion 22 is formed with an engagement gear 22a formed by a rack of the drive gear 21c engaged with the drive gear 21c at one end, and an inclination inclined toward the movement direction of the transmission portion 22 is formed at the other end部22b. In addition, the transmission portion 22 is held by the cover portion 23 slidably with respect to the moving direction of the transmission portion 22 in a state where the drive portion 21 and the transmission portion 22 are held by the cover portion 23.

The engagement gear 22a is formed on the lower surface of the end of the transmission portion 22 on the side of the drive portion 21, and is configured to be located on the drive gear of the drive portion 21 when the drive portion 21 and the transmission portion 22 are held in the cover portion 23 Above 21c.

The inclined portion 22b is inclined such that the thickness of the transmitting portion 22 increases as it goes from the end of the transmitting portion 22 on the moving portion 20 side to the driving portion 21 side. In addition, a guide groove 22e into which the end of the movable portion main body 20a can be inserted is formed in the central portion of the inclined portion 22b. It is configured to insert the end of the moving part main body 20a into the guide groove 22e in a state where the cover part 23 holding the driving part 21 and the transmitting part 22 and the moving part 20 are held in the box part 24, and is mounted on the moving part main body The plug 20e at the end of 20a abuts the inclined portion 22b.

A restriction member 22c that restricts the opening and closing of the lid 3 in accordance with the pressure state in the pot 2 is attached to the end portion of the transmission portion 22 on the side of the driving portion 21. When the pressure regulating valve 15b is in the closed position, the restricting member 22c is located between the holding member (not shown) and the opening and closing portion (not shown), and restricts the cover 3 from the closed state to the open state. In a state where the lid body 3 is configured in a closed state, the lid body 3 is held by the rice cooker main body 1, and the opening and closing portion configures the lid body 3 from the closed state to the open state. In addition, the restricting member 22c is configured to move between the holding member (not shown) and the opening and closing portion (not shown) when the pressure regulating valve 15b is in the open position, and the lid 3 can be configured to open from the closed state status. In addition, a detecting member 22 d for detecting the position of the transmitting portion 22 is arranged on the transmitting portion 22.

As shown in FIG. 3, the control part 6 which controls the heating part 4 and the pressure adjustment part 5 is arrange|positioned in the inside of the rice cooker main body 1. As shown in FIG. The control unit 6 has a memory unit (not shown) for memorizing a plurality of cooking steps corresponding to a plurality of cooking modes for cooking the food to be cooked into the pot 2. Here, the cooking step includes: a preheating step, which is a step of preheating the cooked object in the pot 2 and a heating step, a step of boiling the cooked object in the pot 2, and a boiling maintenance step, and maintaining the cooked object in the pot 2. In the boiling state and the steaming step, the cooking material in the pot 2 is steamed. Moreover, the cooking step refers to the step of cooking the cooked object by sequentially performing the preheating step, the temperature rising step, the boiling maintaining step, and the steaming step. In addition, in each step of the cooking step, the energization time, heating temperature, heating time, heating output, etc. have been set in advance for each of the plurality of cooking modes.

The control unit 6 controls the heating unit 4 and the cooking step corresponding to the cooking mode selected from the plurality of cooking modes in response to the user operating the operation unit 7, and the temperature of the pot detected by the temperature sensor 1b The pressure adjusting part 5 is used to cook the food to be cooked in the pot 2.

Hereinafter, the operation and effect of the rice cooker 100 configured as above will be described.

When cooking the food to be cooked containing rice and water, the user puts the food to be cooked into the pot 2 and stores the pot 2 with the food to be cooked in the pot accommodating portion 1a of the rice cooker body 1. Then, the user moves the lid 3 from the open state, that is, the state in which the inner lid 10 installed on the lid 3 opens the opening 2a of the pot 2, to the closed state of the lid 3, that is, it is installed on the lid 3 The inner lid 10 of 3 is a state in which the opening 2a of the pot 2 is closed, and the lid body 3 is configured in a closed state with respect to the main body 1 of the rice cooker.

In the state where the lid 3 is configured in the closed state with respect to the rice cooker main body 1, the user confirms the cooking conditions such as the cooking mode displayed on the display section 8, and operates the operation section 7 to set the food to be put into the pot 2. Cooking conditions such as the cooking mode of cooking and the end time of cooking. Then, after operating the operating portion 7 to set the cooking conditions of the cooked object, the user operates the cooking start button (not shown) provided in the operating portion 7 to start the cooking of the cooked object.

The control unit 6 controls the heating unit 4 and the pressure adjusting unit 5 in accordance with the cooking conditions such as the cooking mode set by the user to cook the cooking. Here, the following is directed to putting 3 cups of rice and the water required to cook 3 cups of rice as the cooking material into the pot 2, and the user uses the operating part 7 to select the cooking mode for cooking the cooking material, And start cooking to explain.

When the user starts to cook the food, the control part 6 will control the heating part 4 and the pressure adjusting part 5 according to the cooking step corresponding to the cooking mode selected by the user, and execute the preheating step and heating up in sequence Step, boiling maintaining step and steaming step.

As shown in FIG. 6, the control unit 6 controls the heating unit 4 to heat the pot 2 in the preheating step, thereby preheating the cooking material contained in the pot 2. Here, the preheating step refers to immersing the rice at the temperature at which the gelatinization starts (hereinafter referred to as the "gelatinization start temperature") in order to sufficiently gelatinize the rice to the center of the rice in the step performed after the preheating step. ) In the water of the following temperature, come the step of making rice absorb water in advance.

In the preheating step, the control unit 6 controls the heating unit 4 to heat the pot 2 and raises the temperature of the cooking material contained in the pot 2 to a temperature below the gelatinization start temperature (about 60°C). Then, the control unit 6 controls the heating unit when the temperature of the cooking material in the pot 2 is detected to be below the gelatinization start temperature based on the temperature of the pot 2 detected by the temperature sensor 1b 4 Heat the pot 2 to preheat the cooking material in the pot 2 so that the temperature of the cooking material in the pot 2 is maintained below the gelatinization start temperature.

In the warm-up step, the control unit 6 controls the pressure control valve unit 15 by controlling the pressure control valve drive unit 19, and maintains the state where the pressure control valve unit 15 configures the first steam discharge port 11a to be in a closed state. That is, in this embodiment, the pressure regulating valve 15b is not pressed by the pressure regulating valve driving unit 19 at the start of the preheating step, and therefore is located in the closed position. Therefore, in the warm-up step, the control unit 6 controls the pressure regulating valve drive unit 19 not to actuate and maintains the pressure regulating valve 15b in the closed position, thereby maintaining the closed state of the first steam discharge port 11a.

As shown in FIG. 6, the control unit 6 ends the preheating step and executes the temperature raising step after the preheating step is preset in response to the cooking mode selected by the user from the preheating step. Here, the temperature-raising step refers to a step of heating the pot 2 at one go to rapidly increase the temperature of the object to be heated contained in the pot 2 to a temperature at which the object to be heated will boil (hereinafter referred to as "boiling temperature").

In the temperature raising step, the control unit 6 controls the heating unit 4 to rapidly heat the pot 2 to raise the temperature of the heated object contained in the pot 2 to the boiling temperature (approximately 105°C), so that the heated pot 2 is heated The boil is boiling.

In the temperature increase step, the control unit 6 controls the pressure regulating valve unit 15 by controlling the pressure regulating valve drive unit 19 to configure the first steam discharge port 11a from the closed state to the open state, and the first steam discharge port 11a Keep it open.

Specifically, when the control unit 6 shifts from the warm-up step to the temperature increase step, it controls the drive unit 21 to move the transmission unit 22 to the moving unit 20 side. That is, when the control unit 6 shifts from the warm-up step to the temperature-raising step, it will drive the drive motor 21a, so that the drive gear 21c mounted on the rotating shaft 21b of the drive motor 21a rotates in the forward direction (the drive motor 21a is viewed from the front The rotating shaft 21b rotates in a clockwise direction. When the rotating gear 21c mounted on the rotating shaft 21b of the drive motor 21a rotates in the forward direction, the rotational force of the drive motor 21a will be transmitted to the engaging gear 22a through the drive gear 21c, and the transmitting part 22 will be moved to the moving part 20 side. mobile.

In this way, in this embodiment, the engagement gear 22a formed on the lower surface of the end of the transmission portion 22 on the side of the drive portion 21 is located above the drive gear 21c mounted on the rotating shaft 21b of the drive motor 21a, and the drive gear 21c and The engagement gear 22a is engaged. With this configuration, the rotational force of the drive motor 21a is converted into the force in the moving direction of the transmitting portion 22, and the transmitting portion 22 is moved to the moving portion 20 side. Here, in the present embodiment, the moving direction of the communicating portion 22 is a direction parallel to the placing surface F when the rice cooker 100 is placed on the placing surface F (see FIG. 3) of a kitchen or a dining table, etc., which is also Figure 3 shows the direction of arrow X.

After the transmitting portion 22 is moved to the moving portion 20 side by the driving portion 21, the moving portion 20 is moved to the pressure regulating valve 15b side by the transmitting portion 22, and the pressure regulating valve 15b is moved to the pot 2 by the moving portion 20 Move sideways to move the pressure regulating valve 15b from the closed position to the open position. That is, when the drive gear 21c attached to the rotating shaft 21b of the drive motor 21a rotates in the forward direction to move the transmitting portion 22 toward the moving portion 20, the latch 20e mounted on the moving portion main body 20a moves along the transmitting portion The inclined portion 22b of 22 slides. As the end portion of the moving portion main body 20a on the transmitting portion 22 side moves along the guide groove 22e formed in the central portion of the inclined portion 22b, the moving portion main body 20a moves downward (the pressure regulating valve 15b side). When the moving part body 20a moves to the pressure regulating valve 15b side, as the moving part body 20a moves, the pressing part 20b formed at the end of the moving part body 20a on the pressure regulating valve 15b side will be removed from the pressure regulating valve 15b side formed in the cover 3 The opening (not shown in the figure) moves to the side of the pressure regulating valve 15b, and the pressure regulating valve 15b is pressed to the side of the pot 2 through the seal (not shown in the figure). When the pressure regulating valve 15b is pressed toward the pot 2 by the pressing portion 20b, the pressure regulating valve 15b moves from the closed position to the open position. In this way, in the present embodiment, since the inclined portion 22b is formed at the end of the transmitting portion 22 on the side of the moving portion 20, the moving portion 20 can move along the inclined portion 22b. Therefore, the direction of movement of the transmitting portion 22 can be changed. The force is transformed into the force in the pressing direction of the moving part 20, and the pressure regulating valve 15b can be moved from the closed position to the open position. Here, the moving direction of the moving part 20 and the pressure regulating valve 15b is a direction orthogonal to the moving direction of the transmitting part 22 (the direction of arrow X shown in FIG. 3), and is also the direction of arrow Y shown in FIG.

When the pressure regulating valve 15b moves from the closed position to the open position, the control unit 6 stops the driving of the driving unit 21, stops the movement of the transmitting unit 22 and the moving unit 20, and keeps the pressure regulating valve 15b in the open position. That is, when the pressure regulating valve 15b moves from the closed position to the open position, the control unit 6 stops the driving of the drive motor 21a and stops the rotation of the drive gear 21c in the forward rotation direction. When the rotation of the drive gear 21c in the forward rotation direction is stopped, the movement of the transmitting portion 22 to the moving portion 20 side is stopped. When the movement of the transmitting portion 22 to the moving portion 20 side is stopped, the movement of the moving portion main body 20a to the pressure regulating valve 15b side is stopped. At this time, since the plug 20e installed in the moving part body 20a contacts the inclined part 22b, and the pressure regulating valve 15b is pressed toward the pot 2 by the pressing part 20b of the moving part body 20a and is in the open position, the driving of the control part 6 is stopped. The drive of the portion 21 keeps the pressure regulating valve 15b in the open position.

As shown in Fig. 6, the control unit 6 detects the temperature of the heated object contained in the pot 2 to the boiling temperature based on the temperature of the pot 2 detected by the temperature sensor 1b. After the object to be heated has boiled, the heating step is ended, and the boiling maintenance step is performed. Here, the boiling maintaining step refers to a step of maintaining a boiling state of the cooked material in the pot 2 and gelatinizing starch contained in the rice to increase the gelatinization degree to about 50% to 80%.

In the boiling maintenance step, the control unit 6 controls the heating unit 4 to heat the pot 2 so that the temperature of the cooking material in the pot 2 is maintained near the boiling temperature based on the temperature of the pot 2 detected by the temperature sensor 1b , In order to maintain the cooking material in the pot 2 in a boiling state.

In the boiling maintenance step, the control unit 6 controls the pressure control valve unit 15 by controlling the pressure control valve drive unit 19 to move the pressure control valve unit 15 from the closed state to the open state multiple times to adjust the inside of the pot 2. pressure.

Specifically, the control unit 6 shifts from the temperature increase step to the boiling maintenance step, and after a predetermined time has elapsed from the boiling maintenance step, the control unit 6 controls the driving unit 21 to move the transmission unit 22 toward the driving unit 21 side. That is, after the control unit 6 shifts from the temperature raising step to the boiling maintenance step, and after a predetermined time has elapsed from the boiling maintenance step, it will drive the drive motor 21a, and move the drive gear 21c mounted on the rotating shaft 21b of the drive motor 21a to It rotates in the reverse direction (the rotating shaft 21b of the drive motor 21a is counterclockwise when viewed from the front). When the drive gear 21c mounted on the rotating shaft 21b of the drive motor 21a rotates in the reverse direction, the rotational force of the drive motor 21a will be transmitted to the engagement gear 22a through the drive gear 21c, causing the transmission part 22 to move to the drive part 21 side . In this way, in this embodiment, the engagement gear 22a formed on the lower surface of the end of the transmission portion 22 on the drive portion 21 side is located above the drive gear 21c mounted on the rotating shaft 21b of the drive motor 21a, and the drive gear 21c Since it engages with the engaging gear 22a, the rotational force of the drive motor 21a is converted into the force of the moving direction of the transmission part 22, and the transmission part 22 is moved to the drive part 21 side.

After the transmitting part 22 moves to the driving part 21 side by the driving part 21, the moving part 20 will move along the transmitting part 22 to the transmitting part 22 side, and the pressing of the pressure regulating valve 15b caused by the moving part 20 will be released. The pressure regulating valve 15b is moved from the open position to the closed position. That is, when the drive gear 21c attached to the rotating shaft 21b of the drive motor 21a rotates in the reverse direction to move the transmitting portion 22 toward the drive portion 21, the latch 20e mounted on the moving portion body 20a moves along the transmitting portion 22 The inclined portion 22b slides. Then, as the end portion of the moving portion main body 20a on the side of the transmitting portion 22 moves along the guide groove 22e formed in the central portion of the inclined portion 22b, the moving portion main body 20a moves upward (the transmitting portion 22 side). When the moving part main body 20a moves to the transmitting part 22 side, as the moving part main body 20a moves, the pressing part 20b formed at the end of the moving part main body 20a on the pressure regulating valve 15b side will be formed from the pressure regulating valve 15b side Move on the side of the opening (not shown) of the cover 3. When the pressing portion 20b moves to the cover 3 side, the pressing of the pressure regulating valve 15b by the pressing portion 20b is released, and the pressure regulating valve 15b is moved from the open position to the closed position by the restoring force of the first spring 15c.

In this way, in this embodiment, an inclined portion 22b is formed at the end of the transmitting portion 22 on the moving portion 20 side so that the moving portion 20 can move along the inclined portion 22b, and the pressure regulating valve portion 15 is provided with a counter pressure The adjustment valve 15b applies the first spring 15c of potential energy to the cover 3 side. Therefore, by controlling the driving part 21 by the control part 6 to move the transmitting part 22 to the driving part 21 side, the state of pressing the pressure regulating valve part 15 by the moving part 20 can be released, and the pressure regulating valve 15b can be moved from the open position to the closed position mobile.

When the pressure regulating valve 15b moves from the open position to the closed position, the control unit 6 stops the driving of the driving unit 21, stops the movement of the transmission unit 22 and the moving unit 20, and maintains the pressure regulating valve 15b at the closed position. That is, when the pressure regulating valve 15b moves from the open position to the closed position, the control unit 6 stops the driving of the drive motor 21a and stops the rotation of the drive gear 21c in the reverse direction. When the rotation of the drive gear 21c in the reverse direction stops, the movement of the transmission part 22 to the drive part 21 side will stop. When the movement of the transmitting portion 22 to the driving portion 21 side is stopped, the movement of the moving portion main body 20a to the transmitting portion 22 side is stopped, and the pressure regulating valve 15b is maintained in the closed position. At this time, since the pressure regulating valve 15b is released from the pressing caused by the moving part main body 20a, and is held in the closed position by the force of the potential energy of the first spring 15c, it is maintained by the pressure regulating valve 15b. The state where the first steam outlet 11a is blocked.

In the cooking step, the opening 2a of the pot 2 is sealed by the inner lid 10, and the inside of the pot 2 and the outside of the pot 2 are communicated only by the pressure regulating valve section 15, the pressure suppression valve section 16, and the safety valve section 17. The pressure control valve portion 16 is operated by a pressure above the upper limit of the pressure range adjusted by the pressure control valve portion 15, and the safety valve portion 17 is operated by a pressure higher than the pressure at which the pressure control valve portion 16 operates. action.

Therefore, in the boiling maintenance step, when the pressure regulating valve 15b is in the closed position, the communication between the inside of the pot 2 and the outside of the pot 2 will be blocked, and therefore the steam generated by the boiling of the cooking material in the pot 2 It stays in the pot 2, and the inside of the pot 2 is pressurized by the steam, and the pressure in the pot 2 rises to the pressure at which the pressure suppression valve 16b is operated. Furthermore, the steam discharged to the outside of the pot 2 flows into the inside of the steam drum 9 from the steam inlet 9c of the steam drum 9 and is discharged to the outside of the rice cooker 100 from the steam outlet 9d of the steam drum 9.

On the other hand, in the boiling maintaining step, when the pressure regulating valve 15b is in the open position, the inside of the pot 2 communicates with the outside of the pot 2 through the pressure regulating valve portion 15, so that the product to be cooked in the pot 2 is boiled. The steam will be discharged from the pressure regulating valve 15 to the outside of the pot 2. Therefore, the inside of the pot 2 is not pressurized by the steam generated by the boiling of the cooking material in the pot 2, and the pressure in the pot 2 can be maintained close to the atmospheric pressure.

In this way, in the boiling maintenance step, the pressure in the pot 2 can be increased by placing the pressure regulating valve 15b in the closed position, and the pressure in the pot 2 can be increased by placing the pressure regulating valve 15b in the open position. stress reliever. Therefore, in the boiling maintaining step, the control unit 6 controls the pressure regulating valve unit 15 by controlling the pressure regulating valve drive unit 19, and by moving the pressure regulating valve 15b from the closed position to the open position, or from the open position to the closed position Move the position to control the pressure in the pot 2.

Furthermore, as shown in Fig. 6, in the present embodiment, the control unit 6 controls the pressure regulating valve unit 15 by controlling the pressure regulating valve drive unit 19 in the boiling maintaining step, and sequentially executes the first pressure regulating step, The second pressure adjustment step, and the third pressure adjustment step. Here, the first pressure adjustment step means increasing the pressure in the pot 2 from the first pressure P1 to the second pressure P2 higher than the first pressure P1, and reducing the pressure from the second pressure P2 to the first pressure P1 step. The second pressure adjustment step is to increase the pressure in the pot 2 from the first pressure P1 to a third pressure P3 that is higher than the first pressure P1 and lower than the second pressure P2, and then reduce the pressure from the third pressure P3 to Step of the first pressure P1. In addition, the third pressure adjustment step is to increase the pressure in the pot 2 from the first pressure P1 to a fourth pressure P4 that is higher than the third pressure P3 and below the second pressure P2, and then to decrease the pressure from the fourth pressure P4 The pressure is the step of the first pressure P1. Furthermore, in this embodiment, the first pressure P1 is set to atmospheric pressure (1.0 atm) or a pressure close to atmospheric pressure, and the second pressure P2 is set to 1.2 atm which is a pressure higher than the first pressure P1, and the The case where the pressure P3 is 1.1 atmospheric pressure higher than the first pressure P1 and lower than the second pressure P2, and the fourth pressure P4 is the same pressure as the second pressure P2 will be described. In addition, in this embodiment, when the pressure in the pot 2 reaches the upper limit of the pressure range adjusted by the pressure regulating valve portion 15, that is, when the pressure is equal to or higher than the second pressure P2, the pressure suppression valve 16b will The steam outlet 11b moves from the closed position to the open position, and the pressure in the pot 2 does not become a pressure higher than a predetermined pressure. Furthermore, in this embodiment, when the pressure in the pot 2 becomes the pressure at which the pressure suppression valve 16b operates, that is, the pressure is higher than the pressure at which the pressure suppression valve 16b moves from the closed position to the open position, the safety valve 17b The configuration in which the third steam outlet 11c is moved from the closed position to the open position will be described.

In the boiling maintenance step, the control unit 6 executes the first pressure adjustment step after a predetermined time elapses from the start of the boiling maintenance step. That is, the control unit 6 controls the pressure regulating valve drive unit 19 to move the pressure regulating valve 15b from the open position to the closed position after a predetermined time has elapsed after the boiling maintenance step starts, and maintains the pressure regulating valve 15b in the closed position for a predetermined time , So that the pressure in the pot 2 is increased from the first pressure P1 to the second pressure P2. Then, the control unit 6 maintains the pressure regulating valve 15b in the closed position for a predetermined time to increase the pressure in the pot 2 from the first pressure P1 to the second pressure P2, and then controls the pressure regulating valve driving unit 19, and The pressure regulating valve 15b is moved from the closed position to the open position to reduce the pressure in the pot 2 from the second pressure P2 to the first pressure P1.

After the first pressure adjustment step ends, the control unit 6 executes the second pressure adjustment step. That is, when the pressure in the pot 2 is reduced from the second pressure P2 to the first pressure P1, the control unit 6 controls the pressure regulating valve drive unit 19 to move the pressure regulating valve 15b from the open position to the closed position, and The pressure regulating valve 15b is maintained in the closed position for a predetermined time to increase the pressure in the pot 2 from the first pressure P1 to the third pressure P3. Then, the control unit 6 maintains the pressure regulating valve 15b in the closed position for a predetermined time to increase the pressure in the pot 2 from the first pressure P1 to the third pressure P3, and then controls the pressure regulating valve drive unit 19, and The pressure regulating valve 15b is moved from the closed position to the open position to reduce the pressure in the pot 2 from the third pressure P3 to the first pressure P1. Here, the control unit 6 controls to maintain the pressure regulating valve 15b in the closed position in the second pressure adjustment step for a shorter time than the time for maintaining the pressure regulating valve 15b in the closed position in the first pressure adjustment step to make The third pressure P3 of the upper limit of pressure in the second pressure adjustment step is lower than the first pressure P1 of the upper limit of pressure in the first pressure adjustment step.

After the second pressure adjustment step ends, the control unit 6 executes the third pressure adjustment step. That is, when the pressure in the pot 2 is reduced from the third pressure P3 to the first pressure P1, the control unit 6 controls the pressure regulating valve drive unit 19 to move the pressure regulating valve 15b from the open position to the closed position, and The pressure regulating valve 15b is maintained in the closed position for a predetermined time to increase the pressure in the pot 2 from the first pressure P1 to the fourth pressure P4. Then, the control unit 6 maintains the pressure regulating valve 15b in the closed position for a predetermined time to increase the pressure in the pot 2 from the first pressure P1 to the fourth pressure P4, and then controls the pressure regulating valve drive unit 19, and The pressure regulating valve 15b is moved from the closed position to the open position to reduce the pressure in the pot 2 from the fourth pressure P4 to the first pressure P1.

After the third pressure adjustment step is completed, the control unit 6 controls the pressure adjustment valve unit 15 by controlling the pressure adjustment valve driving unit 19 to move the pressure adjustment valve 15b from the open position to the closed position. In addition, the control unit 6 maintains the pressure regulating valve 15b at the closed position until the boiling maintaining step ends, and maintains the state where the pressure in the pot 2 is increased from the first pressure P1 to the second pressure P2.

After a predetermined time has elapsed from the boiling maintenance step, almost all the water in the pot 2 will disappear, and the temperature of the bottom surface of the pot 2 will rise to a temperature above the boiling point of water. When the temperature sensor 1b detects that the temperature of the pot 2 reaches a temperature above the boiling point of water (for example, 130° C.), the control unit 6 ends the boiling maintenance step and executes the steaming step. Here, the steaming step refers to a step of evaporating the excess water contained in the cooking material in the pot 2 to increase the gelatinization degree of rice to nearly 100%.

In the steaming step, the control unit 6 controls the heating unit 4 according to the temperature of the pot 2 detected by the temperature sensor 1b, and controls the temperature of the pot 2 to become a predetermined temperature (for example, 100°C). The control unit 6 controls the heating unit 4 to heat the pot 2 when the temperature of the pot 2 is lower than the predetermined temperature, and controls the heating unit 4 to stop the heating of the pot 2 when the temperature of the pot 2 becomes higher than the predetermined temperature.

Furthermore, in the steaming step, the control unit 6 controls the pressure regulating valve unit 15 by controlling the pressure regulating valve drive unit 19, and moves the first steam outlet 11a from the pressure regulating valve 15b to the closed position where the first steam outlet 11a is closed to the closed position. The open position of the open state maintains the pressure regulating valve 15b at the open position.

Specifically, when the control unit 6 shifts from the boiling maintenance step to the steaming step, it controls the drive unit 21 to move the transmission unit 22 to the drive unit 21 side and move the pressure regulating valve 15b from the closed position to the open position. The pressure in the pot 2 is reduced from the second pressure P2 to the first pressure P1. Then, when the pressure regulating valve 15b moves from the open position to the closed position, the control unit 6 stops the driving of the driving unit 21, stops the movement of the transmitting unit 22 and the moving unit 20, and keeps the pressure regulating valve 15b in the open position.

As described above, in the present embodiment, the control unit 6 performs the first pressure adjustment step, the second pressure adjustment step, and the third pressure adjustment step in the boiling maintenance step to rapidly change the pressure in the pot 2 and Make a sudden boiling phenomenon in the pot 2.

Therefore, the cooking material in the mixing pot 2 can be stirred vigorously due to the sudden boiling phenomenon generated in the pot 2, and the heating of the rice to be cooked can be equalized, and the cooking failure of the cooked rice can be suppressed. all.

Furthermore, in this embodiment, in the first pressure adjustment step, the control unit 6 controls the pressure adjustment valve unit 15 by controlling the pressure adjustment valve drive unit 19 so that the pressure in the pot 2 is increased from the first pressure P1 to The second pressure P2 higher than the first pressure P1 is reduced from the second pressure P2 to the first pressure P1. In addition, in the present embodiment, the control unit 6 in the second pressure adjustment step increases the pressure in the pot 2 from the first pressure P1 to a third pressure P3 that is higher than the first pressure P1 and lower than the second pressure P2 Then, the pressure is reduced from the third pressure P2 to the first pressure P1. Furthermore, in the third pressure adjustment step, the control unit 6 increases the pressure in the pot 2 from the first pressure P1 to a fourth pressure P4 that is higher than the third pressure P3 and lower than the second pressure P2, and then, The pressure is reduced from the fourth pressure P4 to the first pressure P1. That is, the control unit 6 sequentially executes the first pressure adjustment step, the second pressure adjustment step, and the third pressure adjustment step in the boiling maintaining step, and controls so that the first pressure adjustment step and the third pressure adjustment step are The upper limit of the pressure will be higher than the upper limit of the pressure in the second pressure adjustment step.

That is, in this embodiment, the control unit 6 sequentially executes the first pressure adjustment step, the second pressure adjustment step, and the third pressure adjustment step. Then, the control unit 6 controls the pressure adjustment unit 5 to change the pressure from the second pressure to the first pressure in the first pressure adjustment step than the pressure from the third pressure to the first pressure in the second pressure adjustment step The changes are even greater. Furthermore, the control unit 6 controls the pressure adjustment unit 5 so that the pressure change from the fourth pressure to the first pressure in the third pressure adjustment step is greater than the pressure change from the third pressure to the first pressure in the second pressure adjustment step The pressure has changed even more.

Thereby, since the pressure change in the pot 2 can be changed when the first pressure adjustment step, the second pressure adjustment step, and the third pressure adjustment step are sequentially performed, it is possible to sufficiently stir the pressure in the pot during the boiling maintenance step. It is a rice soup that can increase the delicious source of rice and enhance the taste of cooked rice.

Furthermore, in this embodiment, the first pressure P1 is set to atmospheric pressure (1.0 atm) or a pressure close to atmospheric pressure, and the second pressure P2 is set to 1.2 atm which is a pressure higher than the first pressure P1, and the The case where the pressure P3 is 1.1 atmospheric pressure higher than the first pressure P1 and lower than the second pressure P2, and the fourth pressure P4 is the same pressure as the second pressure P2 has been described. However, the first pressure P1, the second pressure P2, the third pressure P3, and the fourth pressure P4 only need to be set as P1<P3<P4<=P2, and only need to be set according to the type or type of the cooking object put into the pot 2. The amount and the state of the cooked object after cooking can be set appropriately.

In addition, in the present embodiment, the pressure control valve 16b constituting the pressure control valve portion 16 is given potential energy by a spring (not shown) in a direction in which the second steam discharge port 11b is formed in a closed state. Then, in the present embodiment, when the pressure in the pot 2 becomes a pressure above the upper limit of the pressure range adjusted by the pressure regulating valve portion 15, it resists the force of potential energy imparted by a spring (not shown). The structure in which the pressure suppression valve 16b moves the closed position in which the second steam outlet 11b is configured in the closed state to the open position in which the second steam outlet 11b is configured in the open state has been described. However, the pressure suppression valve 16b may also be constituted by a ball valve, which is when the weight is set to a pressure lower than the upper limit of the pressure range adjusted by the pressure adjustment valve portion 15 than the pressure in the pot 2 When the second steam outlet 11b is configured in a closed state by its own weight, and the pressure in the pot 2 is above the upper limit of the pressure range adjusted by the pressure regulating valve section 15, the pot The pressure within 2 makes the second steam outlet 11b an open state. Moreover, similarly to the pressure suppression valve 16b, the pressure adjustment valve 15b and the safety valve 17b may be constituted by a ball valve whose weight is adjusted in accordance with the pressure at which each valve operates. (Second Embodiment)

Hereinafter, the second embodiment of the rice cooker of the present invention will be described using FIG. 7. In addition, the same reference numerals are attached to the same components as in the first embodiment described above, and the description thereof is omitted.

Fig. 7 is a graph showing changes in the temperature and pressure in the pot in the rice cooking step of the rice cooker in this embodiment.

In this embodiment, the control section 6 controls the pressure control valve section 15 by controlling the pressure control valve drive section 19, and controls so that the pressure reduction rate from the fourth pressure P4 to the first pressure P1 in the third pressure adjustment step is lower than In the first pressure adjustment step, the pressure reduction speed from the second pressure P2 to the first pressure P1 is slower.

Specifically, the control unit 6 controls the pressure regulating valve driving unit 19, and controls the pressure regulating valve driving unit 19 in the third pressure regulating step to operate faster than the pressure regulating valve driving unit 19 in the first pressure regulating step. The speed is slower. Therefore, it is controlled so that the pressure in the pot 2 in the third pressure adjustment step is reduced from the fourth pressure P4 to the first pressure P1 in time than the pressure in the pot 2 in the first pressure adjustment step is reduced from the second pressure P2 to the The first pressure P1 has a longer time. That is, the control unit 6 controls so that the power supplied to the drive unit 21 in the third pressure adjustment step is smaller than the power supplied to the drive unit 21 in the first pressure adjustment step. Through the above-mentioned control, the speed at which the drive gear 21c rotates in the reverse direction in the third pressure adjustment step will be slower than the speed at which the drive gear 21c rotates in the reverse direction in the first pressure adjustment step. Therefore, the speed at which the transmission unit 22 moves to the drive unit 21 side in the third pressure adjustment step is slower than the speed at which the transmission unit 22 moves to the drive unit 21 side in the first pressure adjustment step. Thereby, the speed at which the moving part 20 moves to the side of the transmission part 22 in the 3rd pressure adjustment step will be slower than the speed at which the moving part 20 moves to the side of the transmission part 22 in the 1st pressure adjustment step. Thereby, in the third pressure adjusting step, the pressure adjusting valve 15b configures the first steam outlet 11a to be in an open state faster than the pressure adjusting valve 15b in the first pressure adjusting step configures the first vapor outlet 11a to be in an open state. The speed is slower. In addition, the time required for the pressure regulating valve 15b to move from the closed position to the open position in the third pressure adjusting step is longer than the time required for the pressure regulating valve 15b to move from the closed position to the open position in the first pressure adjusting step.

According to this configuration, the control unit 6 controls the pressure reduction rate from the fourth pressure P4 to the first pressure P1 in the third pressure adjustment step to be lower than the pressure reduction from the second pressure P2 to the first pressure P1 in the first pressure adjustment step The speed is slower.

As described above, in the present embodiment, the control unit 6 controls the pressure control valve unit 15 by controlling the pressure control valve drive unit 19, and controls the pressure reduction from the fourth pressure P4 to the first pressure P1 in the third pressure adjustment step. The speed will be slower than the pressure reduction speed from the second pressure P2 to the first pressure P1 in the first pressure adjustment step. According to this control, it is possible to sufficiently suppress the collapse of the surface of the rice by the change in the pressure in the pot in the third pressure adjustment step. In addition, the entire rice can be heated evenly, and the uneven heating of the cooked rice can be sufficiently suppressed, so the taste of the cooked rice can be further improved. (Third Embodiment)

Hereinafter, the third embodiment of the rice cooker of the present invention will be described. In addition, the same components as those in the first embodiment and the second embodiment described above will be assigned the same reference numerals and their description will be omitted.

In this embodiment, the control unit 6 controls the pressure regulating valve unit 15 by controlling the pressure regulating valve drive unit 19 during the period when a predetermined time has elapsed from the boiling maintenance step to reduce the water in the pot 2 to execute the second In the pressure adjustment step, the pressure is reduced from the fourth pressure P4 to the first pressure P1. Furthermore, when the control unit 6 controls the predetermined time ts from the start of the boiling maintenance step to the execution of the third pressure adjustment step from the fourth pressure P4 to the pressure reduction of the first pressure P1, the predetermined time ts becomes 90 seconds Above 270 seconds.

After the predetermined number of cups of rice and the water required to cook the predetermined number of cups of rice are poured into the pot 2 as the cooked material, the user selects the cooking mode for cooking the predetermined number of cups of rice, and the cooking starts , The control unit 6 will execute the cooking step according to the cooking mode set by the user and the amount of rice (the number of cups) put into the pot 2. Here, in this embodiment, the case where the rice thrown into the pot 2 is 1 cup or more and 5 cups or less is demonstrated.

After the user starts to cook the food to be cooked, the control section 6 controls the heating section 4 and pressure adjustment by the pre-set cooking steps according to the cooking mode selected by the user and the amount of rice put into the pot 2 Section 5 controls the heating temperature, heating time, and heating output in each step of the cooking step to execute each step of the cooking step. In addition, similar to the above-mentioned first and second embodiments, this embodiment is also configured to sequentially perform the preheating step, the temperature raising step, the boiling maintenance step, and the steaming step in the cooking step.

In the boiling maintenance step, the control unit 6 controls the heating unit 4 to heat the pot 2 so that the temperature of the cooking material in the pot 2 is maintained near the boiling temperature based on the temperature of the pot 2 detected by the temperature sensor 1b , In order to maintain the cooking material in the pot 2 in a boiling state.

Therefore, the inventors of the present invention found that the water poured into the pot 2 gradually decreases as the boiling maintenance step continues, but when the amount of water in the pot 2 decreases to a predetermined amount, the pressure in the pot 2 is rapidly increased. The ground change causes a sudden boiling phenomenon in the pot 2. By stirring the rice in the pot 2, high-viscosity rice soup can be produced. In addition, the inventors of the present application have also discovered that it is possible to make rice soup enter the gaps formed between rice grains. In addition, the inventors of the present invention also discovered that, based on the two phenomena discovered by the inventors, the gap between the rice grains can be maintained by the high-viscosity rice soup, so that the cooked rice can stand up fluffy , And can further enhance the taste of the cooked rice.

Therefore, in the present embodiment, the control unit 6 controls the pressure during the time when the water in the pot 2 reaches a predetermined amount, that is, during the time when the predetermined time ts has passed since the boiling maintenance step, the water in the pot 2 decreases. The valve drive unit 19 is adjusted to control the pressure adjustment valve unit 15 to perform the pressure reduction from the fourth pressure P4 to the first pressure P1 in the third pressure adjustment step, so that the pressure in the pot 2 changes rapidly.

According to this structure, the production of rice soup from the delicacy of rice can be increased during the time when the water in the pot 2 is reduced. Therefore, high-viscosity rice soup can be produced and the rice soup can be made to enter between the rice grains. In the gap. Therefore, the high-viscosity rice soup entering the gap between the rice grains can maintain the gap between the rice grains, and the cooked rice can be raised fluffy, and the cooked rice can be further improved. taste.

In addition, in the boiling maintenance step, the predetermined time ts for performing the pressure reduction from the fourth pressure P4 to the first pressure P1 in the third pressure adjustment step is preferably 90 seconds or more and 270 seconds or less, and more preferably It is 120 seconds or more and 240 seconds or less. Moreover, it is preferable that the predetermined time ts is set so that the larger the amount of rice (the number of cups) put into the pot 2, the longer, and the smaller the amount of rice (the number of cups) the shorter.

In the boiling maintenance step, when the predetermined time ts for reducing pressure from the fourth pressure P4 to the first pressure P1 in the third pressure adjustment step is less than 90 seconds, the water in the pot 2 is not sufficiently reduced, so there will be The pressure change from the fourth pressure P4 to the first pressure P1 cannot sufficiently produce high-viscosity rice soup. Therefore, it may not be possible to maintain the gap between the rice grains by the rice soup and make the cooked rice fluffy to stand up. On the other hand, in the boiling maintenance step, when the predetermined time ts for reducing the pressure from the fourth pressure P4 to the first pressure P1 in the third pressure adjustment step is greater than 270 seconds, the water in the pot 2 is excessively reduced, and There is no remaining water to produce rice soup in the pot 2. Therefore, due to the pressure change from the fourth pressure P4 to the first pressure P1, the surface of the rice grains collapses. Therefore, uneven heating of the rice in the pot 2 and uneven cooking of the cooked rice may occur.

Therefore, in order to enhance the deliciousness of the cooked rice and make the cooked rice stand up fluffy, it is desirable to perform the predetermined time ts for reducing pressure from the fourth pressure P4 to the first pressure P1 in the third pressure adjustment step. It is 90 seconds or more and 270 seconds or less, and more preferably 120 seconds or more and 240 seconds or less. Moreover, it is preferable that the predetermined time ts is set so that the larger the amount of rice (the number of cups) put into the pot 2, the longer, and the smaller the amount of rice (the number of cups) the shorter.

According to this structure, the rice soup that is the source of the delicacy of rice can be increased during the period when the water in the pot 2 is reduced, and therefore high-viscosity rice soup can be produced and the rice soup can enter the gaps formed between the rice grains. . In addition, according to this configuration, by the pressure reduction from the fourth pressure P4 to the first pressure P1 in the third pressure adjustment step, it is possible to sufficiently suppress the surface collapse of the rice and cause uneven heating of the rice. Therefore, the high-viscosity rice soup entering the gaps between the rice grains maintains the gaps between the rice grains, so that the cooked rice can stand up fluffy, and the surface collapse of the rice can be sufficiently suppressed to cause cooking. The cooked rice produces uneven cooking, so the taste of the cooked rice can be further enhanced.

In the boiling maintaining step, the control unit 6 controls the pressure regulating valve drive unit 19 to control the pressure regulating valve unit 15 after a predetermined time ts has passed from the boiling maintaining step to execute the fourth pressure regulating step from the fourth in the third pressure regulating step. When the pressure P4 is reduced to the first pressure P1, it is desirable to control it in the following manner. That is, as in the second embodiment described above, the pressure reduction rate from the fourth pressure P4 to the first pressure P1 in the third pressure adjustment step is controlled to be higher than that from the second pressure P2 to the first pressure in the first pressure adjustment step. It is desirable that the decompression speed of the pressure P1 is slower.

According to this structure, by reducing the pressure from the fourth pressure P4 to the first pressure P1 in the third pressure adjustment step, it is possible to more sufficiently suppress the collapse of the rice surface. In addition, the high-viscosity rice soup that enters the gaps between the rice grains maintains the gaps between the rice grains, and the cooked rice can stand up fluffy. Moreover, since the balance of the rice grains can be more reliably prevented from collapsing due to the collapse of the surface of the rice, the taste of the cooked rice is deteriorated, and the taste of the cooked rice can be further enhanced. (Fourth Embodiment)

Hereinafter, the fourth embodiment of the rice cooker of the present invention will be described. In addition, the same reference numerals will be attached to the same components as in the first embodiment to the third embodiment described above, and the description thereof will be omitted.

In this embodiment, the control unit 6 controls the heating unit 4 and the pressure adjustment unit 5 in each pressure adjustment step so that the following (Equation 1), (Equation 2), and (Equation 3) are used in each The total amount of energy accumulated in the pot 2 in the pressure adjustment step becomes 10.58 kW or more and 13.43 kW or less as shown in the following (condition). (Equation 1) Q1=(T1×K×L)÷t1 (Equation 2) Q2=(T2×K×L)÷t2 (Equation 3) Q3=(T3×K×L)÷t3 (condition) 10.58kW ＜=Q1+Q2+Q3＜=13.43kW

Here, the boiling point increase value of water when the pressure is increased from the first pressure P1 to the second pressure P2 is taken as T1, and the boiling point increase value of water when the pressure is increased from the first pressure P1 to the third pressure P3 is taken as T2, and the The boiling point rise value of water when the pressure P1 is increased to the fourth pressure P4 is defined as T3, the specific heat of water is defined as K, and the amount of water in the pot 2 is defined as L. Also, let the time from the second pressure P2 to the first pressure P1 be t1, the time from the third pressure P3 to the first pressure P1 as t2, and the time from the fourth pressure P4 to the first pressure P1 as t3 . Furthermore, the energy accumulated in the pot 2 in the first pressure adjustment step is taken as Q1, the energy accumulated in the pot 2 in the second pressure adjustment step is taken as Q2, and the energy stored in the pot 2 in the third pressure adjustment step As Q3.

In the boiling maintenance step, the pressure in the pot 2 is changed rapidly, and when a sudden boiling phenomenon occurs in the pot 2, the pressure in the pot 2 changes rapidly, and the energy generated by the pressure change in the pot 2 is applied to Being cooked. However, the inventor of the present case discovered that when the energy generated by the pressure change in the pot 2 is too small, the cooking material in the pot 2 cannot be sufficiently stirred, and the rice soup, which is the source of the deliciousness of rice, cannot be sufficiently produced. There are cases where the taste of the cooked food cannot be improved. On the other hand, the inventor of the present case also discovered that when the energy generated by the pressure change in the pot 2 is too large, the energy generated by the pressure change in the pot 2 will cause the cooking in the pot 2 The situation of surface collapse.

Therefore, in the present embodiment, it is possible to increase the production of rice soup, which is the source of the deliciousness of rice, and to sufficiently suppress the collapse of the surface of the rice to deteriorate the taste of the cooked rice. Therefore, the energy Q1 accumulated in the pot 2 in the first pressure adjustment step obtained by the above (Equation 1), and the energy Q1 accumulated in the pot 2 in the second pressure adjustment step obtained by the above (Equation 2) The total of the energy Q2 and the energy Q3 accumulated in the pot 2 in the third pressure adjustment step obtained by the above (Equation 3) is 10.58kW or more and 13.43kW or less. That is, corresponding to each cooking mode, the pressure upper limit value of each pressure adjustment step performed in the boiling maintenance step of the cooking step and the time from the pressure upper limit to the pressure lower limit are set in advance, and the control unit 6 will According to the conditions set in advance, in the boiling maintenance step, the first pressure adjustment step, the second pressure adjustment step, and the third pressure adjustment step are executed.

According to this configuration, in the boiling maintenance step of the present embodiment, the cooking material in the pot 2 can be sufficiently stirred, and the production of rice soup, which is the source of the deliciousness of rice, can be increased. In addition, this embodiment can sufficiently prevent the surface of the rice in the pot 2 from collapsing to collapse the balance of the rice grains, and uneven cooking of the cooked material in the pot 2, which can further enhance the taste of the cooked rice .

As described above, the present invention includes: a rice cooker body and a pot, which are housed in the rice cooker body and contain water and rice to be cooked, and a heating part, are arranged in the rice cooker body, and heat the pot, and a pressure adjusting part , Is to adjust the pressure and control part in the pot, is to control the heating part and the pressure adjustment part. In addition, the control unit will perform a cooking step including a temperature increase step and a boiling maintenance step; the aforementioned temperature increase step will control the heating unit to heat the pot and boil the cooked object contained in the pot; the aforementioned boiling maintenance step will control the heating unit to heat the pot Heat and maintain the boiled state of the cooked material contained in the pot. In addition, in the boiling maintaining step, the control unit will control the pressure adjustment unit to increase the pressure in the pot from the first pressure to a second pressure higher than the first pressure, and then reduce the pressure from the second pressure to the first pressure. The first pressure adjustment step of pressure. In addition, the control unit will increase the pressure in the pot from the first pressure to a third pressure higher than the first pressure and lower than the second pressure, and then reduce the pressure from the third pressure to the second pressure of the first pressure Adjustment steps. In addition, the control unit will increase the pressure in the pot from the first pressure to a fourth pressure higher than the third pressure and below the second pressure, and then reduce the pressure from the fourth pressure to the third pressure of the first pressure Adjustment steps. Furthermore, in the boiling maintenance step, the control unit executes the second pressure adjustment step after the first pressure adjustment step, and executes the third pressure adjustment step after the second pressure adjustment step.

According to this, in the boiling maintenance step, since the cooked material in the pot can be stirred sufficiently, the production of rice soup that is the source of the deliciousness of rice can be increased, and the taste of the cooked rice can be enhanced.

In addition, the present invention may be configured such that in the boiling maintenance step, the control unit controls the pressure adjustment unit so that the pressure reduction rate from the fourth pressure to the first pressure in the third pressure adjustment step is higher than that in the first pressure adjustment step. The decompression speed from the 2 pressure to the first pressure is slower.

According to this, by the change of the pressure in the pot in the third pressure adjustment step, it is possible to sufficiently suppress the collapse of the surface of the rice. In addition, since the whole rice can be heated evenly and the uneven heating of the cooked rice can be sufficiently suppressed, the taste of the cooked rice can be further enhanced.

In addition, the present invention may be configured such that the control unit controls the pressure adjustment unit to perform the third pressure adjustment step from the fourth pressure to the first pressure during a period when a predetermined time has elapsed after the boiling maintenance step starts. When the pressure is reduced, and the control unit controls the pressure adjustment unit to set the predetermined time as ts, the predetermined time ts becomes 90 seconds or more and 270 seconds or less.

Thereby, in the period when the water in the pot decreases, the rice soup that is the source of the deliciousness of rice can be increased, so that high viscosity rice soup can be produced, and the rice soup can enter the gaps formed between the rice grains. In addition, the pressure reduction from the fourth pressure to the first pressure in the third pressure adjustment step can sufficiently suppress the collapse of the surface of the rice and the collapse of the balance of the rice grains. Therefore, the high-viscosity rice soup entering the gaps between the rice grains maintains the gaps between the rice grains, so that the cooked rice can stand up fluffy, and the rice grains caused by the collapse of the surface of the rice can be sufficiently suppressed The balance collapses, resulting in the deterioration of the taste of the cooked rice, which can further enhance the taste of the cooked rice.

In addition, the present invention may be configured such that the control unit controls the pressure adjustment unit so that the energy Q1 accumulated in the pot in the first pressure adjustment step obtained by the following (Equation 1) is obtained by the following (Equation 2) The sum of the energy Q2 accumulated in the pot in the second pressure adjustment step obtained and the energy Q3 accumulated in the pot in the third pressure adjustment step obtained by the following (Equation 3) satisfy the following (conditions) . Furthermore, in the following (Equation 1), (Equation 2), and (Equation 3), the boiling point increase value of water when the pressure is increased from the first pressure to the second pressure is taken as T1, and the pressure is increased from the first pressure to the second pressure. The increase in boiling point of water at 3 pressures is referred to as T2, the increase in boiling point of water from the first pressure to the fourth pressure is referred to as T3, the specific heat of water is referred to as K, and the amount of water in the pot is referred to as L. In addition, the time from the second pressure to the first pressure is defined as t1, the time from the third pressure to the first pressure is defined as t2, and the time from the fourth pressure to the first pressure is defined as t3. (Equation 1) Q1=(T1×K×L)÷t1 (Equation 2) Q2=(T2×K×L)÷t2 (Equation 3) Q3=(T3×K×L)÷t3 (condition) 10.58kW ＜=Q1+Q2+Q3＜=13.43kW

According to this, in the boiling maintenance step, the cooking material in the pot can be fully stirred, and the production of rice soup that is the source of the deliciousness of rice can be further increased, and the cooking failure of the cooking material in the pot can be sufficiently suppressed. Even the situation, and can further enhance the taste of the cooked rice.

According to the rice cooker of the present invention, since it is possible to provide a rice cooker that can increase the production of rice soup from the delicious source of rice and enhance the taste of the cooked rice, it can be suitably used for household and business cooking rice The field and purpose of the device.

1‧‧‧Rice cooker body 1a‧‧‧Pot receiving part 1b‧‧‧Temperature sensor 1c‧‧‧Lid installation part 2,200‧‧‧Pot 2a‧‧‧Opening part 3,202‧‧‧Lid Body 3a‧‧‧Steam cylinder accommodating part 4, 201‧‧‧ Heating part 5‧‧‧Pressure adjustment part 6, 205‧‧‧Control part7‧‧‧Operation part8‧‧‧Display part9‧‧‧Steam cylinder 9a‧‧‧Steam cylinder body part 9b‧‧‧Steam cylinder cover part 9c‧‧‧Steam inlet 9d‧‧‧Steam outlet 10‧‧‧Inner cover 11‧‧‧Heating plate 11a‧‧‧The first steam exhaust Outlet 11b‧‧‧Second steam discharge port 11c‧‧‧Third steam discharge port 11d‧‧‧ Rice soup return port 12‧‧‧First sealing member 13‧‧‧Heat plate support member 14‧‧‧Valve receiving part 14a‧‧‧Second sealing member 15‧‧‧Pressure regulating valve part 15a‧‧‧Pressure regulating valve receiving part 15b‧‧‧Pressure regulating valve 15c‧‧‧First spring 16‧‧‧Pressure suppression valve part 16a‧‧ ‧Pressure suppression valve accommodation part 16b‧‧‧Pressure suppression valve 17‧‧‧Safety valve part 17a‧‧‧Safety valve accommodation part 17b‧‧‧Safety valve 18‧‧‧Miso soup return valve part 18a‧‧‧Miso soup return Valve installation part 18b‧‧‧Meso soup return valve 19‧‧‧Pressure adjustment valve drive part 20‧‧‧Moving part 20a‧‧Moving part body 20b‧‧‧Pressing part 20c‧‧‧Insert port 20d‧‧‧ 2Spring 20e‧‧‧Latch pin 21‧‧‧Drive part 21a‧‧‧Drive motor 21b‧‧Rotating shaft 21c‧‧‧Drive gear 22‧‧‧Transmission part 22a‧‧‧Interlocking gear 22b‧‧‧Tilt part 22c‧‧‧Limiting member 22d‧‧‧Detection member 22e‧‧‧Guide groove 23‧‧‧Cover part 24‧‧‧Box part 100‧‧‧Cooker 203‧‧‧Pressure valve opening device 204‧‧‧Pressure Valve F‧‧‧Placing surface P1‧‧‧First pressure P2‧‧‧Second pressure P3‧‧‧3rd pressure P4‧‧‧4th pressure Ts‧‧‧Scheduled time X, Y‧‧‧Arrow

Fig. 1 is an overall perspective view showing the rice cooker in the first embodiment of the present invention.

Fig. 2 is an exploded perspective view showing the rice cooker in the first embodiment of the present invention.

Fig. 3 is an overall cross-sectional view showing the rice cooker in the first embodiment of the present invention.

Fig. 4A is a bottom perspective view showing the form of the inner cover of the rice cooker in the first embodiment of the present invention viewed from the pot side.

Fig. 4B is a top perspective view showing the form of the inner cover of the rice cooker in the first embodiment of the present invention viewed from the cover body side.

Fig. 5 is an exploded perspective view showing the pressure adjusting part of the rice cooker in the first embodiment of the present invention.

Fig. 6 is a graph showing changes in temperature and pressure in the pot in the cooking step of the rice cooker in the first embodiment of the present invention.

Fig. 7 is a graph showing changes in the temperature and pressure in the pot in the cooking step of the rice cooker in the second embodiment of the present invention.

Fig. 8 is a partial cross-sectional view showing a conventional rice cooker.

Fig. 9 is a graph showing changes in temperature and pressure in a pot in a conventional rice cooker.

Claims (5)

A rice cooker, comprising: a rice cooker body; a pot, which is housed in the rice cooker body and contains water and rice to be cooked; a heating part is arranged in the rice cooker body, and heats the pot; pressure adjustment The part is to adjust the pressure in the pot; and the control part is to control the heating part and the pressure adjusting part. The control part executes the cooking step including the heating step and the boiling maintaining step. The heating step is to control the heating part The pot is heated, and the boiled object contained in the pot is boiled; the boiling maintaining step is to control the heating part to heat the pot and maintain the boiled state of the boiled object contained in the pot, the control part In the boiling maintaining step, the pressure adjusting unit is controlled to execute: the first pressure adjusting step is to increase the pressure in the pot from the first pressure to the second pressure higher than the first pressure, and then from the first pressure The second pressure is reduced to the first pressure; the second pressure adjustment step is to increase the pressure in the pot from the first pressure to a third pressure higher than the first pressure and lower than the second pressure, and then , Reducing the pressure from the third pressure to the first pressure; and in the third pressure adjusting step, increasing the pressure in the pot from the first pressure to a third pressure higher than the third pressure and below the second pressure 4 pressure, and then reduce the pressure from the fourth pressure to the first pressure. In the boiling maintaining step, the control unit executes the second pressure adjustment step after the first pressure adjustment step, and then performs After the second pressure adjustment step, the aforementioned third pressure adjustment step is performed. The rice cooker of claim 1, wherein in the boiling maintaining step, the pressure adjusting portion controls the pressure adjusting portion so that the pressure reducing speed from the fourth pressure to the first pressure in the third pressure adjusting step is lower than In the first pressure adjustment step, the pressure reduction speed from the second pressure to the first pressure is slower. The rice cooker of claim 1, wherein the control unit controls the pressure adjustment unit to execute the third pressure adjustment step during the period when the water in the pot decreases after a predetermined time has elapsed from the boiling maintenance step When the fourth pressure is reduced to the first pressure, the control unit controls the pressure adjustment unit so that when the predetermined time is set as ts, the predetermined time ts becomes 90 seconds or more and 270 seconds or less. Such as the rice cooker of claim 2, wherein the control unit controls the pressure adjustment unit to perform the third pressure adjustment step during the period when the water in the pot decreases after a predetermined time has passed since the boiling maintenance step When the fourth pressure is reduced to the first pressure, the control unit controls the pressure adjustment unit so that when the predetermined time is set as ts, the predetermined time ts becomes 90 seconds or more and 270 seconds or less. The rice cooker according to any one of claims 1 to 4, wherein the control unit increases the pressure from the first pressure when the boiling point increase value of water when the first pressure is increased to the second pressure is used as T1 The boiling point rise value of water at the third pressure is referred to as T2, the boiling point rise value of water when the pressure is increased from the first pressure to the fourth pressure is referred to as T3, the specific heat of water is referred to as K, and the pot water As L, the time from the second pressure to the first pressure as t1, the time from the third pressure to the first pressure as t2, and the time from the fourth pressure to the first pressure The time up to this point is referred to as t3, the energy stored in the pot in the first pressure adjustment step obtained by the following (Equation 1) is referred to as Q1, and the energy obtained by the following (Equation 2) is calculated in the second When the energy stored in the pot in the pressure adjustment step is Q2, and the energy stored in the pot in the third pressure adjustment step obtained by the following (Equation 3) is referred to as Q3, the first pressure is The sum of the energy Q1 accumulated in the pot in the adjustment step, the energy Q2 accumulated in the pot in the second pressure adjustment step, and the energy Q3 accumulated in the pot in the third pressure adjustment step will satisfy the following (Condition) to control the aforementioned pressure adjustment unit, (Equation 1) Q1=(T1×K×L)÷t1 (Equation 2) Q2=(T2×K×L)÷t2 (Equation 3) Q3=(T3 ×K×L)÷t3 (Conditions) 10.58kW＜=Q1+Q2+Q3＜=13.43kW.

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