JP2006320634A - Pressure rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent generation of an abnormal sound during pressure rise and attain stable pressure control. <P>SOLUTION: A pressure rice cooker comprises a rice cooker body 11 for storing a rice cooking pan 10, a lid body 26 for blockading the opening part of the rice cooking pan 10 openably/closably mounted on the rice cooker body 11, an exhaust passage communicating the inside of the rice cooking pan 10 with the outside disposed in the lid body 26, and a valve body made of an energized member 84 for blockading a vent hole 80 disposed in the exhaust passage by energization, and is equipped with a pressure regulating valve 77 capable of pressurizing the inside of the rice cooking pan 10. A valve packing 90 protruding in a nearly conical shape is arranged at the tip of the energized member 84. Blockage is attained by inserting the valve packing 90 into the inside of the vent hole 80. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pressure rice cooker.

  Conventionally, a rice cooker includes a rice cooker body that accommodates a rice cooker and a lid that is attached to the rice cooker body so as to be openable and closable, and the rice cooker is heated by heating means disposed inside the rice cooker body. By doing this, the rice set in the rice cooker is cooked. Among them, the pressure rice cooker is provided with a pressure regulating valve having a valve body that closes the vent hole in the exhaust passage provided in the lid body, and by controlling the amount of heating by the heating means, It is set as the structure controlled to the predetermined pressure more than atmospheric pressure.

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

JP 2004-65394 A

  This Patent Document 1 is equipped with a pressure regulating valve in which a valve packing is disposed at the tip of a valve body that is a biased member that is biased by a spring, and the vent hole of the exhaust path is closed by the valve packing. A pressure cooker is described. Specifically, the pressure regulating valve includes a valve seat member disposed on a removable inner lid, a cover covering the valve seat member, and a spring receiving member disposed on the cover so as to be movable up and down. In addition, a biased member is disposed inside these members, and a spring is disposed between the biased member and the spring receiving member.

  The valve seat member is provided with a vent so as to face the inside of the rice cooker, and the biased member is provided with a valve packing that closes the vent by a biasing force of a spring. . In addition, in the rice cooker of this patent document 1, the urging | biasing force of the to-be-biased member by a spring can be changed by moving the said spring receiving member up and down with a drive means via a link mechanism.

  The valve packing includes a pressure contact portion having an annular shape with a diameter larger than that of the vent hole, and closes the vent hole formed in the valve seat member in a substantially surface contact state by elastic deformation of the press contact portion. It is configured.

  However, in the pressure rice cooker, when the pressure in the rice cooker is raised above the preset upper limit pressure, the biased member of the pressure regulating valve moves backward against the biasing force of the spring, so that the inside of the rice cooker Although the pressure is reduced by exhausting the steam, there is a problem in that the biased member vibrates left and right during the operation, noise is generated, and stability related to pressure adjustment is reduced.

  This invention is made | formed in view of the conventional problem, and makes it a subject to provide the pressure rice cooker which can perform stable pressure regulation while preventing generation | occurrence | production of the abnormal noise at the time of pressure | voltage rise.

  In order to solve the above-mentioned problems, a pressure rice cooker according to the present invention includes a rice cooker body that houses a rice cooker, a lid that is attached to the rice cooker body so as to be openable and closable, and closes an opening of the rice cooker, and the lid. An exhaust passage that is provided in the body and communicates with the inside of the rice cooker and the outside, and a valve body that includes a biased member that closes a vent hole provided in the exhaust passage by biasing, and the inside of the rice cooker is In the pressure rice cooker provided with a pressure regulating valve capable of being pressurized, a valve packing protruding in a substantially conical shape is disposed at the tip of the biased member, and the valve packing is fitted into the vent hole and closed. It is configured to do.

  In this pressure rice cooker, the valve packing protruding in a substantially conical shape is configured to be fitted and closed in the vent hole, and these are sealed in a line contact state, so that the closing accuracy can be improved. Moreover, when the inside of the rice cooker is pressurized and the biased member moves backward against the biasing force, the vibration (movement) to the left and right is restricted by the edge of the vent hole. Therefore, it is possible to suppress the generation of abnormal noise during the operation of the pressure regulating valve and improve the stability related to pressure adjustment.

Specifically, in the valve packing, an angle at which a pair of straight lines located symmetrically with respect to the axial center in the central cross section is in a range of about 40 degrees to about 130 degrees.
Moreover, it is preferable that the edge where the cone part of valve packing is press-contacted in the said vent hole is a non-chamfered state of about 90 degree | times.
By doing so, it is possible to reliably prevent the generation of abnormal noise.

Furthermore, it is preferable that the urging force for closing the vent hole is changed by the driving means.
Furthermore, it is preferable to provide a stopper portion protruding in a flange shape at the base portion of the conical portion of the valve packing.
If it does in this way, when a to-be-biased member is urged | biased, it can prevent that valve packing is press-fitted excessively in a vent hole and the inside of a rice cooker is overpressurized.

  In the pressure rice cooker of the present invention, since the valve packing protruding in a substantially conical shape is fitted and closed inside the vent hole, the inside of the rice cooking pan is pressurized and the energized member moves backward against the urging force. Furthermore, the vibration to the left and right is regulated by the edge of the vent hole. Therefore, it is possible to suppress the generation of abnormal noise during the operation of the pressure regulating valve and improve the stability related to pressure adjustment.

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

  1 and 2 show a pressure rice cooker according to an embodiment of the present invention. This pressure rice cooker includes a rice cooker body 11 that detachably houses a rice cooking pot 10 that is electromagnetically heated, and a lid body 26 that is rotatably attached to the rice cooker body 11. An inner lid 61 is detachably attached to the inner surface.

  The rice cooker body 11 includes an exterior body including a cylindrical body 12, a bottom body 13 that closes a lower end opening of the body 12, and a shoulder body 14 that is attached to cover the upper end opening of the body 12. ing. The shoulder body 14 includes a circular opening 15 for detachably disposing the rice cooking pot 10 at the center thereof, and a cylindrical inner body 16 and a non-conductive body are formed below the opening 15. A saucer-shaped protective frame 17 made of a material is provided. An induction heating coil 18 is disposed on the lower outer peripheral surface of the protective frame 17 via a ferrite core 19. Further, a rice cooker temperature sensor 20 for detecting the temperature of the rice cooker 10 is disposed through the protective frame 17. Further, the shoulder body 14 is provided with a hinge receiving portion 21 for attaching the lid body 26 so that the lid body 26 can be opened and closed on the back side, and a lock hole 22 for latching the lock member 35 of the lid body 26 on the front side. Yes. Furthermore, an operation unit including an operation board 23, a menu sheet 24, and a surface member 25 is provided on the upper front side of the shoulder body 14.

  The lid body 26 is attached to the hinge receiving portion 21 of the shoulder body 14 so as to be openable and closable, and closes the opening 15 of the rice cooker body 11, and constitutes an outer surface material together with the exterior body of the rice cooker body 11. A plate 27, a lower plate 31 that closes the bottom of the upper plate 27, and an inner lid 61 that is detachably attached to the lower surface of the lower plate 31 are provided. And the inside of this cover body 26 is provided with the 1st and 2nd exhaust passage which connects the inside of the rice cooking pot 10 and the exterior, and each raises the inside of the rice cooking pot 10 in steps in steps beyond atmospheric pressure. First and second pressure regulating valves 67 and 77 are provided. Each exhaust passage merges into one on the exhaust (atmosphere) side, and a steam port unit 97 is detachably disposed at the exit portion.

  The upper plate 27 is provided with a mounting hole 29 for rotatably mounting an operation member 28 for opening the lid 26 at the front portion thereof. In addition, an arrangement recess 30 of a steam port unit 97 having a connection port formed in the center is provided on the rear side of the upper plate 27.

  As shown in FIG. 1 to FIG. 3, the lower plate 31 has a shape corresponding to the concave depression shape on the upper side of the shoulder body 14. A hinge connection portion 32 that is pivotally attached to the hinge receiving portion 21 of the shoulder body 14 is provided on the rear side portion of the lower plate 31. The hinge connection portion 32 is provided with a shaft 33 penetrating the hinge receiving portion 21 and a hinge spring 34 for urging the lid body 26 in the opening direction. In addition, a lock member 35 that can be unlocked and locked to the lock hole 22 of the shoulder body 14 is rotatably attached to the front portion of the lower plate 31. The lock member 35 is urged in the lock direction by a spring (not shown). Further, at the center of the upper portion of the lock member 35, an unlocking locking piece 36 for preventing the lid 26 from being opened at the time of pressurization by operating a first solenoid 49 described later is provided.

  A lid heater 38 is disposed on the bottom of the lower plate 31 via a metal heater cover 37, and a lid temperature sensor (not shown) is disposed. A packing 39 is provided on the outer peripheral portion of the heater cover 37 for hermetically sealing the space between the heater cover 37 and the inner lid 61. Further, a metal reinforcing member 40 is disposed on the upper side of the lower plate 31 in order to prevent deformation due to heat and pressure during rice cooking.

  In the lower plate 31 of the present embodiment, first and second accommodating portions 41 that accommodate first and second pressure regulating valves 67 and 77 provided in an inner lid 61 described later adjacent to each other in the width direction. , 45, first and second solenoids 49, 53 which are driving means for the pressure regulating valves 67, 77, and a common exhaust part 58 where the first and second exhaust passages are joined.

  As shown in FIG. 3 and FIGS. 4A and 4B, the first accommodating portion 41 constitutes a part of the first exhaust passage, and a lower end opening that accommodates a first pressure regulating valve 67 described later. The dome shape. A first driving opening 42 is provided in the front portion of the side wall of the first housing portion 41, and a packing 43 is disposed in the first driving opening 42. Further, in the heater cover 37, a position corresponding to the lower end opening of the first accommodating portion 41 is similarly opened, and the space between them is sealed by the packing 44.

  As shown in FIG. 3 and FIGS. 5A and 5B, the second accommodating portion 45 constitutes a part of the second exhaust passage, and upper and lower ends for accommodating a second pressure regulating valve 77 described later. It has a cylindrical shape with an opening. The upper end of the second accommodating portion 45 is a second driving opening 46, and a packing 47 is disposed in the second driving opening 46. Further, in the heater cover 37, a position corresponding to the lower end opening of the second housing portion 45 is similarly opened, and a gap therebetween is sealed by a packing 48.

  As shown in FIGS. 3 and 4 (A) and 4 (B), the first solenoid 49 as the first driving means is a two-position solenoid. A first pressing member 51 that presses the spherical member 76 through 43 is disposed. In the operating state, the first rod 50 is retracted by energization (ON), and the spherical member 76 of the first pressure regulating valve 67 is rolled by its own weight via the packing 43 to be in a pressurized (closed) state. In the operating state, the first rod 50 is advanced by interruption (off), and the spherical member 76 is rolled to be in a non-pressurized (open) state. The first pressing member 51 has a link member 52 that enters the lower portion of the unlocking locking piece 36 of the locking member 35 in the ON state and prevents the lid 26 from being opened due to the rotation of the locking member 35. Is provided.

  As shown in FIG. 3 and FIGS. 5A and 5B, the second solenoid 53 as the second drive means is a two-position solenoid similar to the first solenoid 49, and advances and retreats depending on the presence or absence of energization. A second pressing member 55 is disposed at the tip of the rod 54. The second pressing member 55 includes a trapezoidal protrusion 56 for converting a horizontal operation by energization into a vertical operation (pressing force). Then, the second rod 54 is retracted by energization (ON), and the spring receiving member 93 of the second pressure regulating valve 77 is lowered through the packing 47 and the vertical pressing member 57 to be in a high pressure state, while being shut off (OFF). ), The second rod 54 is advanced and the spring receiving member is raised to a low pressure state.

  The common exhaust part 58 has a cylindrical shape with upper and lower end openings provided at a position corresponding to the connection port of the arrangement recess 30 of the upper plate 27. A packing 59 for sealing between the upper plate 27 and a connection part 99 of a steam port unit 97 to be described later is disposed at the upper end opening of the common exhaust part 58. Further, in the heater cover 37, a position corresponding to the lower end opening of the common exhaust part 58 is similarly opened, and the space between them is sealed by the packing 60.

  As shown in FIG. 6, the inner lid 61 includes a metal inner lid main body 62, a lid packing 65, and a resin frame 66, and the first pressure regulating valve 67 and the second pressure regulating valve are provided in the inner lid main body 62. 77 is integrally attached.

  The inner lid main body 62 serves as a heat radiating plate, and a first opening 63 and a second opening 64 communicating with the inside of the rice cooker 10 are provided at positions corresponding to the housing parts 41 and 45. Yes. The lid packing 65 seals in close contact with the inner periphery of the opening of the rice cooker 10. The resin frame 66 is attached to the inner lid main body 62 so that the lid packing 65 cannot be detached by being sandwiched between the outer peripheral portions of the inner lid main body 62.

  As shown in FIGS. 4A, 4B, and 7A, the first pressure regulating valve 67 includes a first valve seat member 68 and a first cover 72 that covers the first valve seat member 68. These are composed of a spherical member 76 which is a first valve body housed in these, and is housed in the first housing portion 41 by mounting the inner lid 61.

  The first valve seat member 68 has a trapezoidal cylindrical shape with the upper end closed at the lower end opening. The first valve seat member 68 is provided at its lower end with a first flange portion 69 that fits on the side of the rice cooking pot 10 with respect to the first opening 63 of the inner lid body 62. Moreover, the 1st ventilation hole 70 of the opening area which can be exhausted is provided in the center of the flat upper end obstruction | occlusion surface so that the inside pressure of the rice cooking pot 10 may be boiled, and the internal pressure of this rice cooking pot 10 may become equivalent to atmospheric pressure. Yes. Further, a locking groove 71 for fixing the first cover 72 is provided on the outer peripheral portion.

  The first cover 72 covers the first valve seat member 68 in a state in which a later-described spherical member 76 is accommodated, and includes a locking projection 73 that is locked to the locking groove 71. The first cover 72 has an insertion hole 74 corresponding to the first drive opening 42 of the first housing portion 41 and through which the first pressing member 51 of the first solenoid 49 is inserted and retracted via the packing 43. Is provided. Further, exhaust holes 75 are provided in the upper portion of the first cover 72 with a predetermined interval in the circumferential direction.

  The spherical member 76 prevents the air in the rice cooking pot 10 from being exhausted outside by closing the first vent hole 70 by rolling, and increases the pressure in the rice cooking pot 10. is there. In this embodiment, when the pressure in the rice cooker 10 is increased from 1.20 to 1.25 atm, the weight that rolls from the first vent hole 70 at that pressure is used.

  As shown in FIGS. 5 (A), 5 (B) and 7 (B), the second pressure regulating valve 77 includes a second valve seat member 78, a second cover 81, and a second housed therein. It consists of a biased member 84 that is a valve body and a spring receiving member 93, and is housed in the second housing portion 45 by mounting the inner lid 61.

  The second valve seat member 78 has a cylindrical shape with the lower end closed by an upper end opening. The second valve seat member 78 has a second flange portion 79 protruding from the lower end of the second valve seat member 78 that fits on the side of the rice cooker 10 with respect to the second opening 64 of the inner lid body 62. A second ventilation hole 80 is provided on the lower end closing surface. Here, the upper end edge of the second vent hole 80 is a portion to which a valve packing 90 of a biased member 84 to be described later is pressed, and any chamfer is formed at the ridge portion between the inner peripheral surface and the upper surface of the closing surface. Without being processed (non-chamfered state), the angle formed between the upper surface and the inner peripheral surface is approximately 90 degrees.

  The second cover 81 covers the second valve seat member 78 in a state where a biased member 84 and a spring receiving member 93 described later are accommodated, and is a second valve seat member inserted into the inner lid body 62. 78 is engaged. The second cover 81 is formed with an upper exhaust hole 82 corresponding to the second driving opening 46 of the second housing part 45 and a side exhaust hole 83 provided in the side wall part.

  The biased member 84 is provided with an end receiving portion 87 of a spring 86 as biasing means and a packing mounting portion 89 for mounting the valve packing 90 at the lower end of a shaft portion 85 extending in the vertical direction. is there. The end receiving portion 87 protrudes in a disc shape from the shaft portion 85, and a regulating convex portion 88 that regulates the outer circumferential portion of the spring 86 projects upward on the outer circumferential portion thereof. The packing mounting part 89 projects in an inverted T-shaped cross section so that an annular locking groove is formed between the packing receiving part 89 and the end receiving part 87.

  The valve packing 90 has a substantially conical shape that projects toward the tip (lower) end along the axis of the biased member 84, and the packing is attached to the upper end that is the base of the cone 91. A mounted portion 92 for mounting on the portion 89 is provided. The conical portion 91 is fitted into the second vent hole 80 of the second valve seat member 78 and is closed by line contact between the outer peripheral surface and the upper end edge of the second vent hole 80. The diameter is smaller than the inner diameter of the second ventilation hole 80, and the diameter of the upper end thereof is larger than the inner diameter of the second ventilation hole 80. Here, in the central section 91, the angle α at which the pair of straight lines positioned symmetrically with respect to the axis intersects in the central section is in the range of about 40 degrees to about 130 degrees, and in this embodiment, 60 degrees. . Here, when the angle is less than 40 degrees, the conical portion 91 protrudes at an acute angle, so that a phenomenon occurs in which the pressure cannot be released by being completely fitted in the second air hole 80. On the other hand, when the angle is greater than 130 degrees, the conical portion 91 protrudes at an obtuse angle, so that the second valve seat member 78 having the second vent hole 80 is close to surface contact and the second vent hole 80. Since the steam that has passed through impinges on the inner peripheral surface of the second valve seat member 78 at an obtuse angle, noise is generated and the stability of the sealing performance decreases, which is not preferable. The mounted portion 92 has a horizontal concave cross section that protrudes in the horizontal direction from the upper end of the conical portion 91. The lower end portion of the mounted portion 92 serves as a stopper portion that protrudes in a flange shape in the horizontal direction, and prevents the conical portion 91 from completely fitting into the second vent hole 80 to the upper end. .

  The spring receiving member 93 is for positioning the upper end of the spring 86 as an urging member and urging the urged member 84 downward, and a cylindrical portion 94 for restricting the moving direction of the shaft portion 85. The end receiving portion 95 of the spring 86 is provided on the outer periphery of the spring 86. The cylindrical portion 94 is closed at the upper end with a lower end opening, and is arranged so that the upper end protrudes upward from the upper end exhaust hole 82 of the second cover 81. The end receiving portion 95 protrudes downward from above the cylindrical portion 94, and has an outer shape that is the same shape as the upper end exhaust hole 82. The end receiving portion 95 regulates the spring 86 between the end receiving portion 95 and the cylindrical portion 94. The end receiving portion 95 is provided with a stopper portion 96 protruding outward in the radial direction in order to prevent the spring receiving portion from being detached from the second cover 81 by the urging force of the spring 86.

  When the second solenoid 53 is driven (operated), the second pressure regulating valve 77 configured as described above is pressed downward through the packing 47 and the vertical pressing member 57 to drive the second cover 81. It moves downward against the biasing force of the spring 86. As a result, the biasing force for closing the second vent hole 80 of the biased member 84 located at the lower end of the spring 86 is changed via the valve packing 90. In the present embodiment, in the non-operating state of the second solenoid 53 (FIG. 5A), when the pressure in the rice cooker 10 is increased to 1.15 atm, the biased member 84 becomes the biasing force of the spring 86 by the pressure. When the pressure in the rice cooker 10 is increased to 1.20 atm in the operating state (FIG. 5B), the urged member 84 resists the urging force of the spring 86. Then, it is configured to exhaust by rising. That is, the second vent hole 80 is configured to be closed with a larger urging force in the operation state by the second solenoid 53 than in the non-operation state.

  As shown in FIGS. 1 and 2, the steam port unit 97 includes a tray-like lower case 98, an upper case 100 that is detachably attached to the lower case 98, and a steam port packing 102 that seals between the cases. And is detachably connected to the common exhaust part 58 located at the back of the arrangement recess 30 via a packing 59. The lower case 98 is provided with a connecting portion 99 for connecting to the common exhaust portion 58 at a substantially central portion of the bottom wall. The upper case 100 has an upper end closing surface that forms a curved surface integral with the upper plate 27 so as to match the surface shape of the lid body 26 and is detachably assembled to the lower case 98. is there. The upper case 100 is provided with a packing accommodating portion 101 that matches the shape of the side wall of the lower case 98, and a steam port packing 102 that seals between the cases 98, 100 is disposed in the packing accommodating portion 101.

  As shown in FIGS. 4A and 4B, the lid body 26 includes a first valve seat member 68 having a first vent hole 70, a first cover 72 having an exhaust hole 75, and a first cover 72. From the gap between the first housing 41 and the gap between the inner lid main body 62 and the heater cover 37, the path through the common exhaust 58, and the steam outlet unit 97 having an exhaust outlet, A first exhaust passage that communicates with the outside is configured.

  5A and 5B, the second valve seat member 78 having the second ventilation hole 80, the second cover 81 having the upper exhaust hole 82 and the side exhaust hole 83, the second 2 The path from the gap between the cover 81 and the second housing part 45 to the gap between the inner lid main body 62 and the heater cover 37, the common exhaust part 58, and the steam port unit 97 having an exhaust port is a rice cooker. A second exhaust passage that communicates the inside and the outside is formed.

  In the pressure rice cooker having the above-described configuration, rice cooking control and heat retention control are executed according to a preset program by a microcomputer mounted on a control board (not shown). And in rice cooking control, the non-pressurized state which made both the solenoids 49 and 53 into a non-operation state, the low pressurization state which made only the 1st solenoid 49 an operation state, and both solenoids 49 and 53 are made into an operation state. It is executed while performing three-stage pressure control in the high pressure state. Here, in this embodiment, when the solenoids 49 and 53 are in a non-operating state, the inside of the rice cooker 10 is caused by a malfunction of the solenoids 49 and 53 or a malfunction of the rods 50 and 54. This prevents the pressure state from remaining.

  Specifically, in the non-pressurized state, the first pressure regulating valve 67 is in an open state with the spherical member 76 being separated from the first vent hole 70 by the first solenoid 49. Further, the second pressure regulating valve 77 has the spring receiving member 93 raised by the second solenoid 53, and the biased member 84 closes the second vent hole 80 with a biasing force capable of boosting the inside of the rice cooker 10 to 1.15 atm. is doing. Therefore, the inside of the rice cooking pot 10 is in a non-pressurized state where pressure cannot be increased by opening the first vent hole 70 having an opening area that can be exhausted so as to be equal to the atmospheric pressure.

  In the low pressure state, the first pressure regulating valve 67 is in a closed state in which the spherical member 76 rolls on the first vent hole 70 by the first solenoid 49 and the inside of the rice cooker 10 can be boosted from 1.20 to 1.25 atm. It has become. Similarly to the non-pressurized state, the second pressure regulating valve 77 has the spring receiving member 93 raised by the second solenoid 53, and the biased member 84 has a biasing force capable of boosting the inside of the rice cooker 10 to 1.15 atm. Closes the second vent hole 80. Therefore, the inside of the rice cooking pot 10 is in a low pressurization state capable of increasing the pressure up to 1.15 atm where the second pressure regulating valve 77 operates.

  Further, in the high pressure state, the first pressure regulating valve 67 causes the spherical member 76 to roll on the first vent hole 70 by the first solenoid 49 in the same manner as in the low pressure state, so that the inside of the rice cooker 10 starts from 1.20. It is in the closed state that can be boosted up to 1.25atm. Further, the second pressure regulating valve 77 has the spring receiving member 93 lowered by the second solenoid 53, and the biased member 84 closes the second vent hole 80 with a biasing force capable of boosting the inside of the rice cooker 10 to 1.20 atm. is doing. Therefore, the inside of the rice cooker 10 is in a highly pressurized state capable of increasing the pressure up to 1.20 atm where the pressure regulating valves 67 and 77 operate. The first pressure regulating valve 67 also serves as a relief valve when the second pressure regulating valve 77 becomes inoperable for some reason.

  Next, the depressurizing action by the pressure regulating valves 67 and 77 will be described.

  In the first pressure regulating valve 67, as shown in FIG. 4A, the spherical member 76 is separated from the first vent hole 70 and is in contact with the inner wall of the first cover 72. A lower end portion contacting the member 68 is positioned around the first vent hole 70. Therefore, when the first solenoid 49 is operated, the pressurized state shown in FIG. In this state, when the pressure in the rice cooker 10 rises, the steam is exhausted from the gap between the spherical member 76 and the first vent hole 70 so as to push up the spherical member 76 against the weight.

  In the second pressure regulating valve 77, when the first pressure regulating valve 67 is closed and the inside of the rice cooker 10 is boosted to 1.15 atm or more in the state shown in FIG. 5A, the state shown in FIG. When the inside of the rice cooker 10 is increased to 1.20 atm or more, the biased member 84 is pushed up against the biasing force of the spring 86 so that the valve packing 90 of the biased member 84 and the second vent hole 80 Steam is exhausted from the gap.

  At this time, since the second pressure regulating valve 77 is configured to fit the conical portion 91 of the valve packing 90 into the second vent hole 80 and seal them in a line contact state, the closing accuracy can be improved. Moreover, when the inside of the rice cooking pot 10 is pressurized and the biased member 84 moves backward against the biasing force, the vibration (movement) to the left and right is restricted by the edge of the second vent hole 80. Therefore, it is possible to suppress the generation of abnormal noise during the operation of the pressure regulating valve and improve the stability related to pressure adjustment.

  Further, since the second pressure regulating valve 77 is configured such that the operating pressure can be changed by the second solenoid 53, the conical portion 91 is in the second vent hole in a state where the second pressure regulating valve 77 is closed with a strong biasing force by the spring 86. There is a possibility that it will reach the state where it is fitted into 80 and cannot be removed. However, in this embodiment, since the mounted portion 92 serving as a stopper portion is provided at the base portion of the conical portion 91 of the valve packing 90, the valve packing 90 is excessively press-fitted into the second vent hole 80. Problems can be reliably prevented.

  The present inventors conducted an experiment to confirm the action and effect of the pressure cooker equipped with the second pressure regulating valve 77 of the present invention. In this experiment, as a valve packing, a conventional product having an annular pressure contact portion having a diameter larger than that of the second ventilation hole 80 and a cone portion 91 of 60 degrees where α is in the range of about 40 degrees to about 130 degrees. The product of the present invention provided and a comparative product provided with a conical portion of 140 degrees where α is out of range were used. Further, as the valve seat member forming the second vent hole 80, the present invention product in which the edge to which the valve packing is pressed is not chamfered, the first comparative product which has been chamfered by 60 degrees, A second comparative product that had been chamfered was used. And it combined with these and mounted in the pressure rice cooker, and the presence or absence of sounding was judged by performing rice cooking control.

  As a result, as shown in FIG. 8, it was confirmed that noise was generated in the combination of the conventional packing and the valve seat member of the present invention. The combination of the conventional product packing, the first comparative product valve seat member, and the second comparative product valve seat member cannot be reliably sealed by chamfering and cannot be employed.

  In addition, it was confirmed that the combination of the product packing of the present invention and the valve seat member of the present invention could not generate the noise and sufficiently solved the problem. Also. In the combination of the product packing of the present invention, the first comparative product valve seat member and the second comparative product valve seat member, the occurrence of noise was confirmed. This is considered to be caused by a contact portion and a non-contact portion occurring at the time of depressurization because the seal between the valve packing 90 and the second vent hole 80 is performed by surface contact.

  Furthermore, in the combination of the comparative product packing and the present invention valve seat member, the occurrence of noise was confirmed. This is because the conical portion has an obtuse angle, so that the seal with the second vent hole 80 is close to surface contact, and the steam that has passed through the second vent hole 80 is applied to the inner wall of the second valve seat member 78. This is thought to be caused by a collision. Further, in the combination of the comparative product packing, the first comparative product valve seat member, and the second comparative product valve seat member, the generation of noise was also confirmed. Similarly to the above, this is considered to be caused by the contact area between the valve packing and the second vent hole 80 and the vapor passage angle.

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

It is a fragmentary sectional view showing the pressure rice cooker concerning the embodiment of the present invention. It is a fragmentary sectional view which shows the state which cut | disconnected the other part. It is a perspective view which shows the cover body which removed the upper board. (A), (B) is sectional drawing which shows operation | movement of a 1st pressure regulation valve. (A), (B) is sectional drawing which shows operation | movement of a 2nd pressure regulation valve. It is an upper perspective view of an inner lid. (A) is an expanded sectional view which shows a 1st pressure regulation valve, (B) is an expanded sectional view which shows a 2nd pressure regulation valve. It is a chart which shows an experimental result.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Rice cooker 11 ... Rice cooker main body 26 ... Cover body 45 ... 2nd accommodating part 46 ... 2nd drive opening part 47 ... Packing 53 ... 2nd solenoid (drive means)
54 ... second rod 55 ... second pressing member 57 ... vertical pressing member 61 ... inner lid 64 ... second opening 77 ... second pressure regulating valve 78 ... second valve seat member 80 ... second vent hole 81 ... second cover 84: biased member 86 ... spring 90 ... valve packing 91 ... conical portion 92 ... mounted portion (stopper portion)
93 ... Spring receiving member 97 ... Steam port unit

Claims (5)

A rice cooker body containing a rice cooker;
A lid that is attached to the rice cooker body so as to be openable and closable, and closes the opening of the rice cooker;
An exhaust passage that is provided in the lid and communicates with the outside of the rice cooker;
In the pressure rice cooker having a valve body made of a biased member that closes the vent hole provided in the exhaust passage by biasing, and a pressure regulating valve capable of pressurizing the inside of the rice cooker,
A pressure rice cooker characterized in that a valve packing protruding in a substantially conical shape is disposed at the tip of the biased member, and the valve packing is fitted into the inside of the vent hole to be closed.   2. The pressure rice cooker according to claim 1, wherein the valve packing has an angle at which a pair of straight lines located symmetrically with respect to the axis intersect at a central cross section in a range of about 40 degrees to about 130 degrees. .   The pressure rice cooker according to claim 1 or 2, wherein an edge of the vent hole to which the conical portion of the valve packing is pressed is in a non-chamfered state of approximately 90 degrees.   The pressure cooker according to any one of claims 1 to 3, wherein the urging force of the valve body is changed by driving means to close the vent hole.   The pressure rice cooker according to any one of claims 1 to 4, wherein a stopper portion protruding in a flange shape is provided at a base portion of the conical portion of the valve packing.

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