JP3878065B2 - Pressure cooker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure regulating rice cooker, and more particularly to a pressure regulating structure thereof.
[0002]
[Prior art]
As a pressure-regulating rice cooker, the pan inside the jar body is closed with a lid attached to the jar body, and two exhaust ports are provided on the lid through the inside and outside of the pan. Is closed by the weight of the ball-shaped valve body, the second exhaust port is closed by a spring-biased valve body, and the ball-shaped valve body that closes the first exhaust port is used as a pressure regulating valve for rice cooking. On the other hand, there has been known one that uses a valve element that closes the second exhaust port as a relief valve (see JP-A-2001-87122).
[0003]
The ball-shaped valve body used as a pressure regulating valve for rice cooking is pushed back by a solenoid plunger installed in front of the valve body, and opens the exhaust port to open the inside of the pan to the atmosphere. When the plunger moves backward, it returns to the exhaust port by its own weight, closes it, and pressurizes the inside of the pan to a predetermined pressure. Moreover, the valve body used as a relief valve is urged by a coil spring, and is opened when the inside of the pan rises to a certain level or higher, and has a role of preventing internal abnormal pressure increase.
[0004]
In addition, instead of the pressure regulating structure using the ball-shaped valve body, the valve body is configured to be advanced and retracted by a motor, and the pressing force of the valve body that closes the exhaust port is changed steplessly. It is also conventionally known to adjust the pressure steplessly (see Japanese Patent Application Laid-Open No. 2000-287841). In this case, a steam dome is provided inside the exhaust outlet of the lid, and a valve body is provided that moves forward and backward in opposition to a valve hole provided in front of the steam dome. The motor for moving the valve body back and forth is installed with the rotating shaft facing in the front-rear direction, and has a structure for moving the valve body back and forth in the front-rear direction by interposing a screw mechanism with the valve body.
[0005]
[Problems to be solved by the invention]
The above-described structure in which the valve body is moved back and forth by the motor has advantages such as stepless pressure regulation and the elimination of a solenoid. On the other hand, the ball-type valve body storage structure that has been conventionally used is steamed. There is an inconvenience that a design change in place of a dome is necessary and that a mold has to be changed.
[0006]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to use a lid having a storage structure for a ball-shaped valve body that has been generally used in the past as it is, and to enable stepless pressure regulation.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention closes the pan inside the jar main body with a lid attached to the jar main body, and provides two exhaust ports through the inside and the outside of the pan on the lid. Of the exhaust ports, the first exhaust port is closed with a ball-shaped valve body, the second exhaust port is closed with a spring-biased valve body, and the valve bodies are opened at a relatively low pressure. While using a thing as a pressure regulating valve for rice cooking, while using the thing opened at high pressure as a relief valve, while using the ball-shaped valve body which obstruct | occludes the said 1st exhaust port as a relief valve The valve body that closes the second exhaust port is used as a pressure regulating valve for rice cooking, and the valve body that closes the second exhaust port is provided with a continuously variable adjustment device using a rotating device as a drive source. Is.
[0008]
According to said structure, adjustment of rice cooking pressure is performed continuously by the valve body which obstruct | occludes the 2nd exhaust port conventionally used as a relief valve. In addition, since a ball-shaped valve body that closes the first exhaust port, which has been used as a conventional pressure regulating valve, is used as a relief valve, the conventional structure can be obtained simply by changing the set pressure of these valve bodies. The lid can be used as it is.
[0009]
The stepless adjustment device is interposed between the motor as its driving source, the pressing force adjusting portion of the valve body, and the motor and the pressing force adjusting portion, and converts the rotation of the motor into movement in the valve axis direction. The structure which consists of a conversion part to perform can be employ | adopted.
[0010]
In this case, the pressing force adjusting portion is formed by engaging the tip end portion of the inclined leaf spring supported by the cantilever with the valve shaft of the valve body, and the converting portion is attached to the motor shaft in a horizontal plane. It is possible to adopt a configuration formed by contacting a rotating arm that rotates with the inclined surface of the inclined plate spring. According to this configuration, when the rotary arm rotates at a certain angle by the drive of the motor, the tip portion thereof descends or rises depending on the inclination direction of the inclined leaf spring, and the valve shaft engaged with the tip portion moves downward or upward. By moving, the pressing force against the valve body changes, and a stepless pressure regulation operation is performed.
[0011]
Further, the pressing force adjusting portion is formed by a spring receiving member of a pressure adjusting spring and a cam follower that is in direct contact with the pressure receiving spring and is supported so as to be movable up and down, and the converting portion is attached to the motor shaft and within a horizontal plane. It may be formed by bringing the cam follower into contact with a rotating disc cam. In this case, when the disc cam rotates with the rotation of the motor, the pressure adjusting spring is pressed via the cam follower that is in contact with the cam surface. Pressure regulation is performed.
[0012]
Between the spring receiving member of the pressure regulating spring and the cam follower, a top portion of an elastic cap mounted on the lid is interposed, and an upward biasing force is applied to the cam follower by the elastic cap.
[0013]
In addition, as another pressing force adjusting part, it is formed by a spring receiving member of a pressure adjusting spring and a pressure adjusting lever in contact with the spring receiving member, and the conversion part is a pinion attached to the motor shaft and its pinion. It is also possible to adopt a configuration formed by a rack that is meshed with the rack and attached to the force point side end of the pressure adjusting lever. In this case, the top of an elastic cap attached to the lid is interposed between the spring receiving member of the pressure adjusting spring and the pressure adjusting lever, and an upward biasing force is applied to the point of action of the pressure adjusting lever by the elastic cap. To do. The above-mentioned action point can be provided either between the force point and the fulcrum of the pressure adjusting lever or on the opposite side of the force point with respect to the fulcrum.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The pressure-regulating rice cooker according to the first embodiment shown in FIGS. 1 to 4 has a lid 2 attached to a jar body 1 by a hinge 3 so as to be freely opened and closed. A pan 4 is accommodated in the jar body 1, and an opening of the pan 4 is airtightly closed by a packing 6 of a heat sink set 5 detachably attached to the lid 2. A first exhaust port 8 and a second exhaust port 9 are provided in the heat dissipation plate 7 of the heat dissipation plate set 5.
[0015]
A valve support base 12 communicated with the first exhaust port 8 and a valve case 13 communicated with the second exhaust port 9 are provided on the lid lower plate 11 in contact with the upper surface of the heat radiating plate 7. A valve hole 14 is provided in the center of the recessed upper surface of the valve support 12, and the ball-shaped valve body 15 is freely stored in the valve hole 14, and the valve hole is closed by its own weight when the lid 2 is closed. 14 is closed. By setting the weight of the ball-shaped valve body 15 to a size that is pushed up when the internal pressure of the pan 4 is abnormally increased and opens the valve hole 14, an action as a relief valve is performed.
[0016]
A dome-shaped valve cap 16 surrounding the valve support 12 and the ball-shaped valve body 15 is provided on the lid lower plate 11. A vent provided in the lower end portion of the valve cap 16 communicates with the steam passage 18 communicating with the steam hole 17.
[0017]
A valve body 19 that closes the exhaust port 9 is housed in a valve case 13 provided on the second exhaust port 9 and is urged in the closing direction by a valve spring 21. The valve rod 22 of the valve body 19 protrudes upward from the upper portion of the valve case 13 so as to be movable up and down, and the tip of the inclined leaf spring 23 is engaged with the upper end thereof. The other end of the inclined leaf spring 23 extends toward the hinge 3 of the lid 2 and is supported in a cantilever manner inside the lid 2. The support portion 24 (see FIG. 2) is lower than the end portion on the valve body 19 side, and the inclined leaf spring 23 is inclined by the difference in height.
[0018]
A rotating arm 25 that rotates in a horizontal plane is in contact with the inclined surface of the inclined leaf spring 23. This rotary arm 25 is attached to the rotary shaft of a servo motor 26 such as a stepping motor, and is in a range of a constant rotation angle as shown in FIGS. 2 and 3 (a), (b), and (c) by a signal from a microcomputer. Swing. When the rotating arm 25 that rotates in the horizontal plane contacts the inclined surface of the inclined plate spring 23, a conversion unit that converts the rotation of the servo motor 26 into the vertical movement of the inclined plate spring 23 is formed. That is, in the state of (a) in which the tip of the rotary arm 25 is in contact with the portion close to the support portion 24 of the inclined leaf spring 23, no stress is generated in the inclined leaf spring 23, but as the process proceeds (b) (c). The point moves, the stress applied to the inclined leaf spring 23 gradually increases, and the pressing force that presses the valve element 19 downward through the valve rod 22 increases. In this case, the contact position of the rotary arm 25 serves as a fulcrum, and the elasticity at the tip side becomes an additional pressing force against the valve body 19, and the rice cooking pressure is adjusted by the balance with the internal pressure of the pan 4. The valve case 13 is provided with a steam port 27 (see FIG. 2), and the steam discharged from the steam port 27 is discharged from the steam hole 17.
[0019]
As shown in FIG. 4A, the inclined leaf spring 21 as a whole is inclined, but as shown in FIG. 4A, a partial inclined surface 28 is provided to support the whole in a horizontal state, and a rotating arm is provided on the inclined surface 28. 25 may be brought into contact with each other to form a conversion portion.
[0020]
Further, as shown in FIGS. 4B and 4C, the direction of inclination may be reversed (the support portion 24 side is higher), and the rotary arm 25 may be brought into contact with the lower surface thereof. In these cases, the tip of the inclined leaf spring 23 is lifted with the rotation of the rotary arm 25 and acts in the direction of weakening the pressing force of the valve element 19 in opposition to the spring force of the valve spring 21. Can be adjusted steplessly.
[0021]
The portion of the inclined leaf spring 23 from the contact position of the rotating arm 25 to the tip is included in the “pressing force adjusting portion” in the claims. Further, the “conversion portion” includes a contact structure between the inclined surface from the above portion of the inclined leaf spring 23 to the fulcrum portion 24 and the rotary arm 25. The “pressing force adjusting unit” and the “converting unit” constitute a “stepless adjusting device”.
[0022]
Next, the second embodiment shown in FIGS. 5 and 6 is another embodiment of the stepless adjustment device. In this case, the valve seat member 29 having the second exhaust port 9 is mounted from below the collar portion 44 around the mounting hole 43 provided in the heat radiating plate 7 and the valve case member 31 is fitted from above. Yes. The valve seat member 29 is provided with claws 45 at three locations, and each claw 45 is integrated by engaging with an engagement protrusion 46 on the inner surface of the valve seat member 29. The valve body 19 and the valve spring 21 are housed inside the valve case member 31, and the three leg pieces 33 of the spring receiving member 32 are fitted into the valve case member 31 so as to freely move up and down. It protrudes upward from the hole 47 (see FIG. 6) on the upper surface. Each of the leg pieces 33 is fitted and guided in three guide holes 34 provided in the valve case member 31 in the vertical direction.
[0023]
The periphery of the valve case member 31 and the spring receiving member 32 is covered with a rubber elastic cap 35 and covered with a storage portion 37 provided on the lid lower plate 11. The lower end of the elastic cap 35 is sandwiched between the heater mounting plate 30 and the lower plate 11. A cam follower 36 is attached to the upper end of the elastic cap 35, and the upper end portion of the cam follower 36 projects upward from the upper surface of the storage portion 37.
[0024]
A servo motor 26 such as a stepping motor is attached to the outside of the storage portion 37, and a disc cam 38 is attached to the motor shaft. An inclined cam surface 39 is formed on the lower surface of the disc cam 38, and the cam follower 36 is brought into contact with the inclined cam surface 39. The pressing force of the cam follower 36 against the inclined cam surface 39 is obtained by adding the elasticity of the elastic cap 35 to the spring force of the valve spring 21 described above. The elastic cap 35 and the storage portion 37 are provided with steam outlets 40 and 41 for discharging steam.
[0025]
The cam follower 36, the elastic cap 35, the spring receiving member 32, and the valve spring 21 constitute a “pressing force adjusting portion” in the claims, and the inclined cam surface 39 and the cam follower 36 are in contact with each other. The structure constitutes a “transformer”.
[0026]
The second embodiment is as described above, and the cam follower 36 moves up and down according to the rotation angle of the servo motor 26 to change the pressing force of the valve spring 21 through the elastic cap 35 and the spring receiving member 32. . Thereby, rice cooking pressure can be adjusted steplessly.
[0027]
Next, the third embodiment shown in FIGS. 7 to 11 will be described. The pressure regulating valve structure in this case is similar to the second embodiment described above, in which the valve seat member 29 having the second exhaust port 9 is attached from below the flange portion 44 around the attachment hole 43 provided in the heat radiating plate 7. The valve case member 31 is fitted from above. The valve seat member 29 is provided with claws 45 at three locations, and each claw 45 is integrated by engaging with an engagement protrusion 46 provided at a position equally divided into three on the inner surface of the valve case member 31. Each engagement protrusion 46 is formed at the lower end of the engagement groove 48. The valve body 19 and the valve spring 21 are housed inside the valve case member 31, and the three leg pieces 33 of the spring receiving member 32 are fitted in a guide groove 34 ′ formed between the engagement grooves 48 so as to be movable up and down. Be guided. The spring receiving member 32 protrudes upward from the hole 47 at the upper end of the valve case member 31.
[0028]
The periphery of the valve case member 31 and the spring receiving member 32 is covered with a rubber elastic cap 35. A folded collar portion 49 provided at the lower end of the elastic cap 35 is sandwiched between the heater mounting plate 30 and the lid lower plate 11. A thick part 51 is formed on the top of the elastic cap 35.
[0029]
A bracket 52 having a recess 50 (see FIGS. 7B and 8) that surrounds almost half of the elastic cap 35 is attached to the reinforcing bracket 55 of the lid 2 (see FIGS. 10 and 11). As shown in FIG. 8, the servo motor 26 is attached to the bracket 52, and a pinion 53 is attached to the motor shaft. Further, a limit switch 54 is attached to the bracket 52, and a lever attachment portion 56 is provided. The limit switch 54 is attached to the intermediate portion between the lever attachment portion 56 and the pinion 53 described above. A pressure adjusting lever 57 is disposed between the lever mounting portion 56 and the pinion 53, and one end thereof is swingably mounted on the lever mounting portion 56 by a fulcrum pin 58.
[0030]
The pressure adjusting lever 57 has an annular portion 59 that surrounds the upper portion of the elastic cap 35 at an intermediate portion thereof, and an arc-shaped rack 61 that meshes with the pinion 53 at the other end (the force point side end of the pressure adjusting lever 57). Is provided. In addition, hook-shaped attachment portions 62 and 62 are provided on both sides of the ring portion 59, and both end portions of the pressing bar 63 are locked to the attachment portions 62 and 62. A disc-shaped pressing portion 64 is provided at the intermediate portion of the pressing bar 63, and the pressing portion 64 is pressed against or adhered to the thick portion 51 of the elastic cap 35 (see FIG. 7). Further, the armature 66 of the limit switch 54 is brought into contact with the upper surface of the protruding portion 65 (see FIG. 8) provided in a part of the ring portion 59. The pressure adjusting lever 57 has a lever fulcrum that is supported by a fulcrum pin 58 at one end thereof as a fulcrum of the lever, a rack 61 at the other end as a force point, and a pressing lever attached to an intermediate portion thereof. The part 63 becomes an action point.
[0031]
The pressure adjusting lever 57 having the pressing portion 64, the elastic cap 35, the spring receiving member 32, and the valve spring 21 constitute a “pressing force adjusting portion” in the claims, and the rack 61 and the pinion 53. This meshing structure constitutes a “conversion unit”.
[0032]
The third embodiment is as described above, and the pressure adjusting lever 57 swings up and down according to the rotation angle of the servo motor 26, and the pressing force of the valve spring 21 through the elastic cap 35 and the spring receiving member 32. To change. Thereby, rice cooking pressure can be adjusted steplessly. The limit switch 54 is activated in response to the swing of the pressure adjusting lever 57. In this case, it is set to be on when the internal pressure is atmospheric pressure and off when the internal pressure is applied, and the on / off signal is input to the microcomputer to set the zero point of pressure control.
[0033]
Next, the fourth embodiment shown in FIGS. 12 to 14 will be described. The pressure adjustment structure in this case is the same as that of the third embodiment in that the pressure adjustment lever 57 is used, but there is a difference in the specific structure.
[0034]
First, as shown in FIG. 12, the pressure regulating valve has a valve seat member 29 having a second exhaust port 9, a valve seat case 31, a spring receiving member 32, a valve body 19, and a valve spring 21. Is the same as that described above, but the portion covering them is divided into a cap portion 35a and a packing portion 35b in order to reduce the size of the elastic cap 35 described above. The cap portion 35 a is attached to the upper end portion of the cover cylinder portion 68 of the lid lower plate 11, and the packing portion 35 b is interposed between the lower end portion of the cover cylinder portion 68 and the heater attachment plate 30. The lower end portion of the pressing member 71 is inserted into the recess 69 at the top of the cap portion 35a.
[0035]
As shown in FIG. 13, the pressure adjusting lever 57 is formed by integrating a resin rack 61 at one end of a metal lever portion 72. The lever portion 72 is provided with a fulcrum hole 73, and the rack 61. The end on the opposite side is inserted into the mounting hole 74 of the pressing member 71. Further, the rack 61 is provided with a protruding portion 65 similar to that described above.
[0036]
The bracket 52 is fitted to a lever mounting portion 56 provided at an intermediate portion with a fulcrum hole 73 portion of the pressure adjusting lever 57 and is swingably mounted by a fulcrum pin 58. An annular cap pressing portion 75 is provided at the front portion of the lever mounting portion 57. The cap pressing portion 75 is fitted on the outer peripheral portion of the cap portion 35a and fixes the cap portion 35a. A pair of opposed mounting plates 76, 76 are provided at the rear of the lever mounting portion 57, and the limit switch 54 is fixed to one of them and the fixing piece 77 of the servo motor 26 is fixed to the other. The other fixing piece 77 of the servo motor 26 is fixed to another mounting plate 76 ′ (see FIG. 12) provided at the rear end portion of the bracket 52. A pinion 53 is provided on the motor shaft of the servo motor 26.
[0037]
As shown in FIG. 14, the bracket 52 and the pressure adjusting lever 57 are combined, the pressure adjusting lever 57 is swingably attached by a fulcrum pin 58, and the rack 61 and the pinion 53 are engaged with each other. Further, the bracket 52 is fixed to the lid lower plate 11 with a required number of screws 78.
[0038]
The pressure regulating structure of the fourth embodiment is as described above. As in the case of the third embodiment, the pressure regulating lever 57 swings up and down in accordance with the rotation angle of the servo motor 26, and the pressing member 71. The pressing force of the valve spring 21 is changed via the elastic cap 35. Thereby, rice cooking pressure can be adjusted steplessly. The limit switch 54 sets the zero point of the pressure control by the on / off signal as in the case described above.
[0039]
In the pressure adjusting lever 57 in this case, an intermediate portion supported by the fulcrum pin 58 is a fulcrum, a tip portion inserted into the pressing member 71 is an action point, and a portion of the rack 61 is a force point.
In the pressure regulating structure described above, when the pressure regulating lever 57 swings from the pressurized state to the depressurized state by the action of the servo motor 26, the valve body 19 is pushed by the internal pressure and rapidly rises to increase the pressure. There is a chance to escape at once. In order to prevent this, as shown in FIG. 15, an annular regulating member 79 is placed on the upper end of the valve seat member 29, and this is held by the step portion of the valve case member 31. By causing the inner periphery of the regulating member 79 to face the valve body 19, the valve body 19 is prevented from rising beyond a certain level. As a result, the depressurization of the valve body 19 beyond a certain level is regulated during depressurization, and the rapid depressurization of the internal pressure is suppressed.
[0040]
In each of the above embodiments, as shown in FIG. 1, the ball-shaped valve body 15 that closes the first exhaust port 8 is used as a relief valve, and the valve body 19 that closes the second exhaust port 9 is cooked. The stepless adjustment structure of the pressure regulating valve has been variously described as each embodiment. In this case, there is no common point between the valve structure of the relief valve and the valve structure of the pressure regulating valve. However, if configured as follows, the parts can be shared. That is, in the pressure regulating valve, as shown in FIGS. 16A and 17A, the valve seat member 29 having the second exhaust port 9 is provided in the heat radiating plate 7 as in the above-described embodiments. In addition, the valve case member 31 is fitted from above the flange portion 44 around the attachment hole 43. A packing 81 is interposed between the collar portion 44 and the valve seat member 29.
[0041]
The valve body 19 is housed inside the valve case member 31, and the valve spring 21 is interposed between the valve body 19 and the spring receiving member 21. The spring receiving member 32 protrudes upward from the hole 47 at the upper end of the valve case member 31. A force adjusted by the adjustment structure shown in each of the embodiments is applied to the top of the spring receiving member 32 protruding upward.
[0042]
On the other hand, as shown in FIG. 16B and FIG. 17B, the relief valve has a flange around a mounting hole 43 ′ in which a valve seat member 29 ′ having a first exhaust port 8 is provided in the heat radiating plate 7. While being attached from below the portion 44 ', the valve case member 31' is fitted from above. A packing 81 ′ is interposed between the collar portion 44 ′ and the valve seat member 29 ′. The valve body 19 ′ is accommodated in the valve case member 31 ′, and the valve spring 21 ′ is interposed between the valve body 19 ′ and the spring receiving portion 32 ′. The valve body 19 ′ is guided by the inner diameter of the spring receiving portion 32 ′. The valve spring 21 'has a larger spring force than the valve spring 21 of the pressure regulating valve so that the valve body 19' is pushed open when the inside of the pan rises to a certain level or higher.
[0043]
When the pressure regulating valve and the relief valve are configured as described above, there is an advantage that the valve bodies 19 and 19 ′, the valve seat members 29 and 29 ′, and the packings 81 and 81 ′ are shared parts.
【The invention's effect】
As described above, according to the present invention, the conventional pressure regulating structure of the lid using the ball-shaped valve body for the first exhaust port and the spring-type valve body for the second exhaust port is maintained. In addition to the advantage of not changing the basic structure of the pressure rice cooker, the rice cooking pressure can be adjusted steplessly, and rice can be cooked at a desired pressure. Moreover, since no solenoid is used, the pressure regulator can be configured compactly.
[Brief description of the drawings]
1 is a cross-sectional view of a lid portion according to a first embodiment. FIG. 2 is a partially enlarged cross-sectional view of the same. FIG. 3 is a partially omitted plan view of the same. FIG. 5A is a partial plan view of the second embodiment. FIG. 6B is a sectional view of FIG. 6A. FIG. 7A is an exploded perspective view of the same. Partial sectional view of the third embodiment (b) Transverse plan view of the portion of FIG. 8 (a) Exploded perspective view of the same FIG. 9 (a) Bottom view of the valve case member (b) (d) (a) Cross-sectional view taken along line bb in FIG. (c) Cross-sectional view taken along line cc in (a) (d) Cross-sectional view taken along line dd in (b) FIG. FIG. 11 is a partially cut perspective view of the fourth embodiment. FIG. 12 is a sectional view of the fourth embodiment. FIG. 13 is a partially exploded perspective view of the same. FIG. 14 is a partially exploded perspective view of the same. 15] Partial cross-sectional view of the above-described modification. [FIG. Cross-sectional view of pressure regulating valve (b) Cross-sectional view of modified relief valve FIG. 17 (a) Exploded perspective view of pressure regulating valve of FIG. 16 (a) (b) Exploded perspective view of relief valve of FIG. 16 (b) Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Jar body 2 Lid 3 Hinge 4 Pan 5 Heat sink set 6 Packing 7 Heat sink 8 1st exhaust port 9 2nd exhaust port 11 Cover lower plate 12 Valve support stand 13 Valve case 14 Valve hole 15 Ball-shaped valve body 16 Valve cap 17 Steam hole 18 Steam passage 19, 19 ′ Valve body 21, 21 ′ Valve spring 22 Valve shaft 23 Inclined leaf spring 24 Support portion 25 Rotating arm 26 Servo motor 27 Steam port 28 Inclined surface 29 Valve seat member 30 Heater mounting plate 31, 31 'Valve case member 32, 32' Spring receiving member 33 Leg piece 34 Guide hole 34 'Guide groove 35 Elastic cap 36 Cam follower 37 Storage part 38 Disk cam 39 Inclined cam surface 40, 41 Steam port 43, 43' Mounting holes 44, 44 ′ Brim portion 45 Claw 46 Engagement protrusion 47 Hole 48 Engagement groove 49 Folding collar portion 50 Recess 51 Thick portion 52 Bracket 53 Pinion 54 Limit Switch 55 Reinforcing bracket 56 Lever mounting portion 57 Pressure adjusting lever 58 Supporting pin 59 Ring portion 61 Rack 62 Mounting portion 63 Press bar 64 Pressing portion 65 Protruding portion 66 Armature 68 Cover portion 69 Recessing portion 71 Pressing member 72 Lever portion 73 Supporting point hole 74 Mounting hole 75 Cap holding part 76, 76 'Mounting plate 77 Fixing piece 78 Screw 81, 81' Packing

Claims (8)

  The lid inside the jar body is closed by a lid attached to the jar body, and two exhaust ports are provided in the lid through the inside and outside of the pan. Of the two exhaust ports, the first exhaust port is a ball shape. The valve body is closed and the second exhaust port is closed with a spring-biased valve body. Among these valve bodies, those that are opened at a relatively low pressure are used as pressure-regulating valves for rice cooking, while high pressure is used. In a pressure-regulating rice cooker that uses what is opened as a relief valve, the ball-shaped valve body that closes the first exhaust port is used as a relief valve, and the valve body that closes the second exhaust port is cooked. A pressure-regulating rice cooker characterized in that a stepless adjustment device using a rotating device as a drive source is attached to a valve body that is used as a pressure-control valve for the operation and closes the second exhaust port.   The stepless adjustment device is interposed between the motor as the drive source, the pressing force adjustment part of the valve body, and the motor and the pressing force adjustment part, and converts the rotation of the motor into a movement in the valve axis direction. The pressure-regulating rice cooker according to claim 1, comprising: a conversion unit that performs the conversion.   The pressing force adjusting part is formed by engaging the tip of a cantilevered leaf spring that is cantilevered with the valve shaft of the valve body, and the converting part is attached to the motor shaft and rotates in a horizontal plane. The pressure-regulating rice cooker according to claim 2, wherein the arm is formed by abutting an inclined surface of the inclined plate spring.   The pressing force adjusting portion is formed by a spring receiving member of a pressure adjusting spring and a cam follower that is in direct contact with the spring receiving member and is supported so as to move up and down. The converting portion is attached to the motor shaft and rotates in a horizontal plane. The pressure-regulating rice cooker according to claim 2, wherein the cam follower is brought into contact with a disc cam.   The top of an elastic cap mounted on a lid is interposed between a spring receiving member of the pressure regulating spring and the cam follower, and an upward biasing force is applied to the cam follower by the elastic cap. 4. Pressure-regulating rice cooker according to 4.   The pressing force adjusting portion is formed by a spring receiving member of a pressure adjusting spring and a pressure adjusting lever in contact with the spring receiving member, and the converting portion meshes with a pinion attached to the motor shaft and the pinion. The pressure-regulating rice cooker according to claim 2, wherein the pressure-controlling rice cooker is formed by a rack attached to an end portion on the power point side of the pressure adjusting lever.   Between the spring receiving member of the pressure adjusting spring and the pressure adjusting lever, an apex portion of an elastic cap attached to the lid is interposed, and an upward biasing force is applied to the operating point of the pressure adjusting lever by the elastic cap. The pressure-regulated rice cooker according to claim 6,   8. The pressure regulating rice cooker according to claim 7, wherein the point of action of the pressure regulating lever is provided between the fulcrum and the power point or on the opposite side of the force point with respect to the fulcrum.

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