JP3923382B2 - Pressure regulator of pressure rice cooker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure regulating valve of a pressure rice cooker.
[0002]
[Prior art]
Pressure-type rice cookers (including pressure-type rice cookers) include rice pressure regulators for maintaining the internal pressure at atmospheric pressure or higher during rice cooking, and safety pressure regulators for preventing abnormal pressure increase above a certain level (so-called Safety valve) is provided.
[0003]
As these pressure regulating valves, those conventionally used are generally provided with a valve seat in the middle of a steam passage for releasing steam generated inside the rice cooker to the outside with a required pressure on the valve seat. It has a structure in which a ball that closes the hole is placed (see, for example, JP-A-9-140571). By appropriately selecting the weight of this ball, it can be properly used as a pressure regulating valve for rice cooking or a pressure regulating valve for safety.
[0004]
Further, the valve seat member constituting the pressure regulating valve is inserted from below into a hole provided in the heat radiating plate of the lid, and is injection-molded silicone between the lower end collar portion of the valve seat member and the hole peripheral portion. The rubber seal member was sandwiched and fixed by riveting.
[0005]
[Problems to be solved by the invention]
However, in the pressure regulating valve as described above, due to the processing accuracy of the valve hole and the ball, there is a problem that the valve hole is not completely closed by the ball, and steam leakage is likely to occur. Further, since the fixed portion of the valve seat member is riveted, the seal is incomplete due to variations in caulking, and there is a possibility that steam leaks from this portion.
[0006]
If steam leaks, accurate pressure adjustment cannot be performed. In addition, if steam leakage occurs at the time of heat retention after the completion of cooking, it may cause yellowing of rice, a decrease in the amount of water retention, odor adhesion, and the like.
[0007]
Accordingly, the first object of the present invention is to eliminate the risk of steam leakage in a pressure regulating valve using a ball as a valve body.
[0008]
In addition, since one of the causes of steam leakage is the ball itself, the second object of the present invention is to provide a pressure regulating valve that does not use the ball and does not have steam leakage.
[0009]
Furthermore, the silicone rubber seal member used in the fixed portion of the valve seat member has a problem of increasing the cost of the product because a molding die is required. In view of this, a third problem is to enable reliable sealing at low cost by using an existing seal member.
[0010]
[Means for Solving the Problems]
In order to solve the above first problem, the present invention provides a valve seat in the middle of a steam passage for releasing steam generated inside a rice cooker to the outside, and a valve with a required pressure on the valve seat. In the pressure regulating valve of the pressure rice cooker provided with a valve body that closes the hole, the seal attached to the valve seat around the valve hole closing portion of the valve body is contacted around the valve hole closing portion and sealed. Adopted.
[0011]
According to the above configuration, even if there is a gap between the valve body and the valve hole due to variations in machining accuracy, the gap is formed by the packing that avoids the valve hole and contacts around the valve hole blocking portion of the valve body. Since it is blocked, no steam leakage occurs. By appropriately selecting the pressure applied to the valve hole of the valve body, it can be used as a pressure regulating valve for cooking rice or for safety.
[0012]
It is possible to adopt a configuration in which the valve body is a ball, the packing has a lip portion inclined toward the valve hole around the valve hole, and the ball is placed on the lip portion. In this case, the ball closes the valve hole by its own weight, while the ball is sealed by the lip portion of the packing on which the ball is placed, thereby preventing steam leakage. By appropriately selecting the weight of the ball, it can be used as a pressure regulating valve for cooking rice or for safety.
[0013]
In order to solve the second problem, the present invention provides a valve seat having a valve hole in the middle of a steam passage for releasing steam generated inside the rice cooker to the outside, on the valve seat. In a pressure regulating valve of a pressure rice cooker provided with a valve body that closes a valve hole with a required pressure, the valve body is formed by a rubber valve body provided with a membrane-like valve portion on the inner periphery of an annular mounting portion. Forming a bulging portion that bulges downward in the central portion of the valve portion , and providing a plurality of openings at predetermined intervals in the circumferential direction in the valve portion between the bulging portion and the mounting portion The configuration is such that the valve hole is closed with a required elastic force by the bulging portion , and the valve portion is elastically deformed by an internal pressure greater than the elastic force to open the valve hole.
[0014]
According to said structure, since a valve hole is obstruct | occluded by the valve part of a rubber-made valve body, it can be used as a pressure regulating valve for rice cooking or safety by selecting the elastic force suitably. Further, the valve hole is reliably closed, and steam leakage is prevented.
[0015]
Furthermore, in order to solve the third problem, the present invention is configured such that the valve seat member provided with the above-described valve seat is hermetically sealed via an O-ring on an inner diameter surface of a burring portion provided on a heat radiating plate of the lid. The installed configuration was adopted. This eliminates the need for a molding die and improves the sealing performance.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The pressure rice cooker shown in FIG. 1 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 radiating plate set 5 (see FIG. 2) detachably attached to the lid 2. A rice pressure regulating valve 8 and a safety pressure regulating valve 9 are attached to the heat radiating plate 7 of the heat radiating plate set 5.
[0017]
As shown in FIG. 3A, the rice cooking pressure regulating valve 8 includes a valve seat member 11 that penetrates the heat sink 7 from below, a packing 12 that is attached to the valve seat member 11, a ball 13 as a valve body, and a valve. The case 14 is configured.
[0018]
The valve seat member 11 is hermetically inserted through the O-ring 16 into the inner diameter surface of the burring portion 15 provided on the heat radiating plate 7, and the lower flange portion 17 of the valve seat member 11 contacts the lower surface of the burring portion 15. It is done. Further, the upper end surface of the valve seat member 11 serves as a valve seat 18, and a valve hole 19 is provided at the center of the valve seat 18.
[0019]
As shown in FIGS. 3B and 3C, the packing 12 includes an annular mounting portion 21 and a film-like lip portion 22 formed on the inner periphery of the upper end thereof. The valve seat 18 is attached to the valve seat 18 by forcibly fitting into the outer peripheral groove 23 of the valve seat 18. The lip portion 22 protrudes downwardly toward the valve hole 19 around the valve hole 19 at the upper part of the valve seat 18 (see FIG. 3A).
[0020]
The ball 13 rests on the valve hole 19 and closes it, and rests on the surface of the lip portion 22 of the packing 12. However, the ball 13 slightly touches the lip portion 22 and lifts the ball 13. There is nothing. That is, the ball 13 pressurizes and closes the valve hole 19 by its own weight, while the lip portion 22 seals the periphery of the portion where the ball 13 closes the valve hole 19 over the entire circumference.
[0021]
The valve case 14 contains a ball 13 therein, and a lower end is fitted to the outer diameter surface of the burring portion 15, and an inwardly engaging claw 24 provided on the valve case 14 is provided. The valve seat member 11 is locked. By this locking, the valve seat member 11 is integrated with the heat radiating plate 7.
[0022]
As shown in FIG. 1, the rice cooking pressure regulating valve 8 is inserted into the steam passage member 25 inside the lid 2 by fitting the heat radiating plate set 5 to the lower surface of the lid 2. The steam passage member 25 communicates with the steam hole 27 through the reservoir 26. That is, the rice cooking pressure regulating valve 8 is provided in the middle of the steam passage having the inner peripheral portion of the lower end collar portion 17 of the valve seat member 11 as an inlet and the steam hole 27 as an outlet.
[0023]
A solenoid 28 is provided inside the lid 2, and its plunger 29 faces the valve case 14 via a packing 31. When the plunger 29 protrudes, the ball 13 in the valve case 14 is separated from the valve hole 19 and stops the pressure adjusting action. Further, when the plunger 29 is moved back to the solenoid 28 side, the ball 13 returns to the valve hole 19 by its own weight, and during rice cooking, the pressure is adjusted by the balance between the weight of the ball 13 and the internal pressure. 19 is closed. In these cases, the lip portion 22 of the packing 12 performs a sealing action around the closed portion of the valve hole 19 to prevent steam leakage.
[0024]
Further, since the O-ring 16 is interposed between the fixed portion of the valve seat member 11 and the burring portion 15 of the heat radiating plate 7, steam leakage is also prevented in this portion.
[0025]
If several notches 22 ′ are provided in the lip portion 22 of the packing 12 as shown in FIG. 3 (d), the flexibility of the lip portion 22 is increased and the force to lift the ball 13 is reduced. Does not interfere with the pressurizing action.
[0026]
As shown in FIG. 2 (c), the safety pressure regulating valve 9 is a normal one in which the valve body 32 is pressed by a coil spring 33, and the valve body 32 is coiled when the internal pressure rises abnormally. The spring 33 is pushed up and released to release the internal pressure.
[0027]
Next, 2nd Embodiment shown in FIG. 4 is a case where the thing of the same structure as the said pressure regulating valve 8 for rice cooking is used as the safety regulating valve 8 '. About the structure of each part, the same code | symbol is attached | subjected and shown to the same part as mentioned above. The weight of the ball 13 ′ is selected to be larger than that in the above case, and the ball 13 ′ is pushed up at the time of abnormal pressure increase to release the internal pressure. The packing 12 'and the O-ring 16' prevent vapor leakage as in the case of the first embodiment described above.
[0028]
In this case, the rice pressure regulating valve 34 presses the valve element 35 with the coil spring 36 and presses the spring receiving member 37 of the coil spring 36 with the external pressurizing lever 38, thereby allowing stepless pressure adjustment. It is something that can be done.
[0029]
Next, 3rd Embodiment shown in FIG. 5 and 4th Embodiment shown in FIG. 6 show the pressure regulating valves 8 and 8 for rice cooking, respectively, and all are in the burring part 15 of the heat sink 7. FIG. The valve seat member 11 is fitted through an O-ring 16. Further, the annular engagement member 42 is fitted to the outer diameter surface of the burring portion 15 and the engagement claw 43 is engaged with the valve seat member 11 so that the valve seat member 11 is integrated with the heat radiating plate 7. It has become.
[0030]
The above-described valve seat member 11 is provided with the lower end collar portion 17, the upper end portion is provided with the valve seat 18, and the valve seat 18 is provided with the valve hole 19 in the same manner as in the above embodiments. It is.
[0031]
A rubber (usually made of silicone rubber) valve element 44 is mounted on the valve seat 18. In the case of the third embodiment, as shown in FIGS. 5B and 5C, the valve body 44 is provided with a membrane-like valve portion 46 on the upper end inner diameter surface of the annular mounting portion 45. The central part of the valve part 46 bulges downward. A plurality of openings 47 are provided in the valve portion 46 between the bulging portion and the mounting portion 45 at predetermined intervals in the circumferential direction.
[0032]
In the valve body 44, the valve portion 46 closes the valve hole 19 by its own elastic force, and when the internal pressure exceeds the elastic force, the valve body 19 is pushed up and the valve hole 19 is opened (FIG. 5A). (See the two-dot chain line). When the valve hole 19 is opened, the internal pressure is released to the inside of the steam passage member, that is, the steam passage 48 through the opening 47.
[0033]
In the valve body 44 of the fourth embodiment shown in FIG. 6, the central portion of the membrane-like valve portion 46 bulges outward, and a cross-shaped cut 49 intersecting at the apex of the bulged portion is the valve portion. 46 is provided. Since the cut 49 is closed by the elastic force of silicone rubber, the valve hole 19 is closed in a normal state. When the internal pressure exceeds the elastic force, it is opened (see the two-dot chain line in FIG. 6A), and the valve hole 19 is opened to the steam passage 48.
[0034]
The thing of said 3rd and 4th embodiment can be used also as a pressure regulating valve for rice cooking, and a pressure regulating valve for safety | security by selecting the magnitude | size of the elastic force of the valve body 44 suitably. In any case, the valve body 44 is made of elastic silicone rubber and has a good sealing performance itself, so that steam leakage can be prevented.
[0035]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent steam leakage that occurs around the valve hole and in the valve seat member fixing portion, so that it is possible to perform accurate pressure adjustment in pressure rice cooking, and to change the color of rice during heat retention, Inconveniences such as a decrease in the amount of water and adhesion of odors can be eliminated.
[0036]
Further, by sealing the valve seat member fixing portion with an O-ring, the cost of the product can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first embodiment. FIG. 2A is a plan view of the same heat sink set. FIG. 1B is a cross-sectional view taken along the line bb in FIG. Cross-sectional view of line -c [FIG. 3] (a) Cross-sectional view of the same pressure regulating valve (b) Top view of the same valve body (c) Cross-sectional view of the same valve body (d) Modification of the above-mentioned valve body (E) A sectional view of a modified example of the valve body of the same. [FIG. 4] (a) A plan view of the heat sink set of the second embodiment (b) A sectional view taken along line bb in FIG. c) A sectional view taken along line cc in FIG. 5 (a). FIG. 5 (a) A sectional view of the pressure regulating valve of the third embodiment. (b) A plan view of the valve body. (c) A section of the valve body. FIG. 6A is a sectional view of a pressure regulating valve according to a fourth embodiment, FIG. 6B is a plan view of the valve body, and FIG. 6C is a sectional view of the valve body.
DESCRIPTION OF SYMBOLS 1 Jar body 2 Lid 3 Hinge 4 Pan 5 Heat sink plate 6 Packing 7 Heat sink 8 Pressure regulating valve for rice cooking 9 Pressure regulating valve for safety 11 Valve seat member 12 Packing 13 Ball 14 Valve case 15 Burring part 16 O ring 17 Lower end flange part 18 Valve seat 19 Valve hole 21 Mounting portion 22 Lip portion 23 Peripheral groove 24 Locking claw 25 Steam passage member 26 Snack reservoir 27 Steam hole 28 Solenoid 29 Plunger 31 Valve body 33 Coil spring 34 Rice pressure regulating valve 35 Valve body 36 Coil spring 37 Spring receiving member 38 Pressure lever 41 Rice pressure regulating valve 42 Engaging member 43 Locking claw 44 Valve body 45 Mounting portion 46 Valve portion 47 Opening 48 Steam passage 49 Cutting

Claims (4)

Adjustment of a pressure-type rice cooker in which a valve seat is provided in the middle of a steam passage that discharges steam generated inside the rice cooker to the outside, and a valve body that closes the valve hole with a required pressure is provided on the valve seat. A pressure regulating valve for a pressure rice cooker, characterized in that a packing attached to the valve seat is sealed by contacting the packing around the valve hole closing portion of the valve body avoiding the valve hole. The valve body is a ball, the packing has a lip portion inclined toward the valve hole around the valve hole, and the ball is placed on the lip portion. Pressure regulator for pressure type rice cooker. A pressure type in which a valve seat having a valve hole is provided in the middle of a steam passage for releasing steam generated inside the rice cooker, and a valve body for closing the valve hole with a required pressure is provided on the valve seat. In the pressure regulating valve of a rice cooker, the valve body is formed by a rubber valve body provided with a membrane-like valve portion on the inner periphery of an annular mounting portion, and a bulging portion that bulges downward in the central portion of the valve portion Providing a plurality of openings at a predetermined interval in the circumferential direction in the valve portion between the bulging portion and the mounting portion, and closing the valve hole with a required elastic force by the bulging portion , A pressure regulating valve for a pressure rice cooker, wherein the valve portion is elastically deformed by an internal pressure greater than the elastic force to open the valve hole. 4. The valve seat member provided with the valve seat is hermetically attached to an inner diameter surface of a burring portion provided on a heat radiating plate of a lid through an O-ring. Pressure regulator for pressure rice cooker.

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