JP2007120557A - Safety valve and its manufacturing method - Google Patents

Safety valve and its manufacturing method Download PDF

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JP2007120557A
JP2007120557A JP2005311159A JP2005311159A JP2007120557A JP 2007120557 A JP2007120557 A JP 2007120557A JP 2005311159 A JP2005311159 A JP 2005311159A JP 2005311159 A JP2005311159 A JP 2005311159A JP 2007120557 A JP2007120557 A JP 2007120557A
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opening
valve
pressure
safety valve
valve body
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Kazuo Yamashita
和雄 山下
Akihiro Nakao
彰寛 中尾
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Nok Corp
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Nok Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

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  • Safety Valves (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety valve 1 which is mounted in an opening 32 of a pressure container 31 to close the opening 32 and is opened to release pressure when pressure in the container 31 reaches a predetermined value; recyclable while responding to a request for reducing the size of the safety valve whose valve body does not separate to the outside, and usable at non-limited positions. <P>SOLUTION: The safety valve 1 comprises a valve body 2 inserted into the opening 32, a first engagement part 5 for engaging with an inner edge 32a of the opening 32 and for disengaging therefrom to permit the movement of the valve body 2 in a come-off direction when pressure reaches a predetermined value, a second engagement part 6 for engaging with the inner edge 32a of the opening 32 to prevent the come-off of the valve body 2 from the opening 32 when the valve body 2 is moved in the come-off direction, and a pressure releasing flow path 7 for prohibiting the communication of the inside of the container 31 with the outside when the valve body 2 engages with the first engagement part 5 and for permitting the communication of the inside of the container 31 with the outside when the valve body 2 engages with the second engagement part 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、圧力容器の開口部に装着されて前記圧力容器の密封作用および防爆作用をなす安全弁に関するものである。本発明の安全弁は、コンデンサ、キャパシタまたは二次電池等の圧力容器に用いられ、また、家電分野または自動車分野等にて用いられる。また、本発明の安全弁は、容器の密封性および防爆性を必要とする様々な分野に幅広く用いられる。   The present invention relates to a safety valve that is attached to an opening of a pressure vessel and performs sealing and explosion-proofing of the pressure vessel. The safety valve of the present invention is used in a pressure vessel such as a capacitor, a capacitor, or a secondary battery, and is also used in the home appliance field, the automobile field, or the like. In addition, the safety valve of the present invention is widely used in various fields that require sealing and explosion-proofing of containers.

近年、電解コンデンサ、キャパシタまたは二次電池等の形状は、これらを収納する空間を有効利用するために、小径化、扁平化、薄型化の傾向がある。したがって、これらの圧力容器の開口を閉塞する封口板についても、小径、扁平、薄型となっており、封口板の開口部に装着される安全弁についても、その外径寸法が小さなものが要求されるようになっている。   In recent years, the shapes of electrolytic capacitors, capacitors, secondary batteries, and the like tend to be reduced in diameter, flattened, and thinned in order to effectively use the space for storing them. Therefore, the sealing plates that close the openings of these pressure vessels are also small-diameter, flat, and thin, and the safety valve that is attached to the opening of the sealing plate is required to have a small outer diameter. It is like that.

この点につき、従来の安全弁５１は、図１０に示すように、圧力容器３１の開口部３２に装着される筒状の弁本体５２の内周部に、破裂部として作用する薄肉部５３を一体成形したものであるが、上記理由により弁本体５２の外径寸法が小さくなると、薄肉部５３の成形が困難になることから、或る程度以上の小径化は不可能である。また、薄肉部５３は一度破裂すると密封性および防爆性が喪失されることから、この安全弁５１は再利用することができない。   In this regard, as shown in FIG. 10, the conventional safety valve 51 is integrally formed with a thin portion 53 that acts as a rupture portion on the inner peripheral portion of a cylindrical valve body 52 attached to the opening portion 32 of the pressure vessel 31. Although it is molded, if the outer diameter dimension of the valve body 52 is reduced for the above reason, it is difficult to mold the thin portion 53, and therefore it is impossible to reduce the diameter to some extent. Further, once the thin-walled portion 53 is ruptured, the safety and explosion-proof properties are lost, so that the safety valve 51 cannot be reused.

また、本願出願人は先に、破裂部として作用する薄肉部を有さずに機能することが可能な安全弁として、図１１に示す安全弁６１を提案しており、この安全弁６１によれば、薄肉部を有さないために一層の小径化が可能である（特許文献１参照）。   In addition, the applicant of the present application has previously proposed a safety valve 61 shown in FIG. 11 as a safety valve that can function without having a thin portion that acts as a rupture portion. Since there is no portion, the diameter can be further reduced (see Patent Document 1).

しかしながら、この図１１の安全弁６１は、圧力容器３１内部の圧力が所定値に達したときに安全弁６１全体が外部へ離脱する（矢印方向に離脱する）構造であることから、装着箇所によっては、離脱した安全弁６１が周辺の装置類に対する異物となり、また環境に対して悪影響を及ぼす虞があり、よって使用可能な箇所が限定されてしまう不都合がある。   However, since the safety valve 61 of FIG. 11 has a structure in which the entire safety valve 61 is released to the outside (removed in the direction of the arrow) when the pressure inside the pressure vessel 31 reaches a predetermined value, depending on the mounting location, The detached safety valve 61 becomes a foreign object with respect to surrounding devices, and may have an adverse effect on the environment.

したがって、上記した小径化の要求に応えるとともに再利用することが可能であり、しかも弁全体が外部へ離脱することがなく使用可能箇所が限定されることがない安全弁が求められている。   Accordingly, there is a need for a safety valve that can meet the above-described demand for a reduction in diameter and can be reused, and that does not allow the entire valve to be released to the outside and does not limit the usable location.

特開２００１−８０６６５号公報JP 2001-80665 A

本発明は以上の点に鑑みて、安全弁の小径化の要求に応えるとともに再利用することが可能であり、しかも弁全体が外部へ離脱することがなく使用可能箇所が限定されることがない安全弁を提供することを目的とする。   In view of the above points, the present invention meets the demands for reducing the diameter of a safety valve and can be reused. In addition, the entire valve is not detached to the outside and the usable valve is not limited. The purpose is to provide.

またこれに加えて、安全弁を金型成形するときに発生するバリが安全弁の密封性に悪影響を及ぼすことがなく、もって優れた密封性を発揮することが可能な安全弁の製造方法を提供することを目的とする。   In addition to this, there is provided a method for manufacturing a safety valve capable of exhibiting excellent sealing performance without causing burrs generated when molding the safety valve to have a bad influence on the sealing performance of the safety valve. With the goal.

上記目的を達成するため、本発明の請求項１による安全弁は、圧力容器の開口部に装着されて前記開口部を閉塞するとともに前記圧力容器内部の圧力が所定値に達したときに開弁して前記圧力を開放する安全弁において、前記開口部に挿入される弁本体と、前記弁本体の側面に設けられ、前記開口部の内縁に係合し、前記圧力が所定値に達したときに前記係合が外れて前記弁本体が抜け方向に移動するのを許容する第一係合部と、前記第一係合部の先端側に設けられ、前記弁本体が抜け方向に移動したときに前記開口部の内縁に係合して前記弁本体が前記開口部から抜け出るのを防止する第二係合部と、前記弁本体が前記第一係合部にて係合しているときは前記圧力容器の内外を連通させず前記弁本体が前記第二係合部にて係合したときに前記圧力容器の内外を連通させる圧力開放流路とを有することを特徴とする。   In order to achieve the above object, a safety valve according to claim 1 of the present invention is attached to an opening of a pressure vessel to close the opening and opens when the pressure inside the pressure vessel reaches a predetermined value. In the safety valve that releases the pressure, the valve main body inserted into the opening and the side surface of the valve main body are engaged with the inner edge of the opening, and when the pressure reaches a predetermined value, A first engagement portion that allows the valve body to move in the removal direction after disengagement; and provided at a distal end side of the first engagement portion, and when the valve body moves in the removal direction, A second engaging portion that engages with an inner edge of the opening to prevent the valve body from coming out of the opening, and the pressure when the valve main body is engaged at the first engaging portion. When the valve main body is engaged at the second engagement portion without communicating the inside and outside of the container, And having a pressure release passage for communicating the inside and outside of the pressure vessel.

また、本発明の請求項２による安全弁は、上記した請求項１の安全弁において、圧力開放流路は、弁本体の側面に形成したスリットよりなることを特徴とする。   A safety valve according to claim 2 of the present invention is the safety valve according to claim 1 described above, wherein the pressure release flow path is formed by a slit formed on a side surface of the valve body.

また、本発明の請求項３による安全弁は、上記した請求項１の安全弁において、圧力開放流路は、弁本体の内部に形成するとともに先端面および側面に開口する貫通穴よりなることを特徴とする。   The safety valve according to claim 3 of the present invention is the safety valve according to claim 1 described above, wherein the pressure release flow path is formed inside the valve body and includes a through hole that opens to the front end surface and the side surface. To do.

更にまた、本発明の請求項４による安全弁は、上記した請求項１の安全弁において、圧力開放流路は、第一および第二係合部間に一体成形した接続部の外径寸法が開口部の穴径よりも小さく形成されることにより前記接続部の外周に設定されることを特徴とする。   Furthermore, a safety valve according to a fourth aspect of the present invention is the safety valve according to the first aspect, wherein the pressure release flow path has an outer diameter dimension of the connecting portion integrally formed between the first and second engaging portions. The outer diameter of the connecting portion is set by being formed smaller than the diameter of the hole.

上記構成を備えた本発明の請求項１による安全弁においては、圧力容器の開口部に弁本体を挿入し、このとき、弁本体の先端に設けた第一係合部が開口部の内縁に係合するとともに弁本体の側面が開口部の内面に密接するので、開口部が閉塞された弁閉状態が実現される。この弁閉状態は、開口部を密閉する安全弁の密封作用が発揮されるので、容器内部内部の圧力は密封される。また第一係合部は、容器内部の圧力が所定値に達したときに係合が外れて弁本体が抜け方向に移動するのを許容するよう設定されているので、容器内部の圧力が上昇して所定値に達すると、係合が外れて弁本体が抜け方向に移動する。移動した弁本体は引きつづき、弁本体の更に先端に設けた第二係合部が開口部の内縁に係合するので移動が停止し、よってこの第二係合部の係合により開口部から抜け止めされる。また弁本体には、この移動停止位置において容器の内外を連通させる圧力開放流路が設けられているので、容器内部の高圧はこの圧力開放流路を経由して大気開放され、これにより弁開状態が実現される。このように圧力は、弁本体に設けた圧力開放流路を経由して大気開放されるので、本発明の安全弁は、上記従来技術のような薄肉部を有していない。   In the safety valve according to claim 1 of the present invention having the above-described configuration, the valve body is inserted into the opening of the pressure vessel, and at this time, the first engagement portion provided at the tip of the valve body is engaged with the inner edge of the opening. In addition, since the side surface of the valve body is in close contact with the inner surface of the opening, a valve closed state in which the opening is closed is realized. In this valve closed state, the sealing action of the safety valve that seals the opening is exhibited, so that the pressure inside the container is sealed. The first engagement portion is set so as to allow the valve body to move in the withdrawal direction when the pressure inside the container reaches a predetermined value, so that the pressure inside the container increases. When the predetermined value is reached, the engagement is disengaged and the valve body moves in the direction of removal. The moved valve body continues, and the second engagement portion provided at the further tip of the valve body engages with the inner edge of the opening portion, so that the movement is stopped. It is prevented from coming off. In addition, since the valve body is provided with a pressure release flow path that allows the inside and outside of the container to communicate with each other at this movement stop position, the high pressure inside the container is released to the atmosphere via this pressure release flow path, thereby opening the valve. A state is realized. As described above, since the pressure is released to the atmosphere via the pressure release flow path provided in the valve body, the safety valve of the present invention does not have the thin portion as in the above-described conventional technology.

弁本体に設けられる圧力開放流路の構造としては、これをスリット状（請求項２）または貫通穴状（請求項３）とすることが考えられ、また第一および第二係合部間に一体成形した接続部の外径寸法を開口部の穴径よりも小さく形成することによって接続部の外周に設定されるものとしても良い（請求項４）。また、第一および第二係合部の構造としては、これを突起状とするのが好適であり、このように両係合部をボリュームの小さな突起として形成すると、以下のような利点がある。   As a structure of the pressure release flow path provided in the valve main body, it may be considered to be a slit shape (Claim 2) or a through hole shape (Claim 3), and between the first and second engaging portions. It is good also as what is set to the outer periphery of a connection part by forming the outer diameter dimension of the connection part integrally formed smaller than the hole diameter of an opening part (Claim 4). Further, as the structure of the first and second engaging portions, it is preferable to make them into a protrusion shape. When the both engaging portions are formed as protrusions having a small volume in this way, there are the following advantages. .

すなわち、比較例として示す図１２（Ａ）のように、弁抜け止め用の第二係合部６がボリュームの大きなプレート状に形成されていると、この安全弁１を成形するときに用いる金型４１としては、その離型性の都合から、同図（Ｂ）に示すように、分割型４２，４３を弁本体２の径方向（図では左右方向）に分割した金型４１を用いて安全弁１を金型成形することになり、これでは同図（Ｃ）に示すように、弁本体２の中心軸線０と平行なパーティング面４４によるバリＢが発生し、このバリＢは、弁本体２の側面に設定される円筒面状のシール部８と交差することから、シール部８の密封性に支障を来たす虞がある。金型４１の分割（型割り）が上記径方向（図では左右方向）に限定されるのは、分割型４２，４３を弁本体２の軸方向（図では上下方向）に分割すると、プレート状の第二係合部６または蓋部４によるアンダーカット部が大き過ぎて離型できなくなるからである。   That is, as shown in FIG. 12A as a comparative example, when the second engagement portion 6 for preventing valve removal is formed in a plate shape having a large volume, a mold used when molding the safety valve 1 41, for the convenience of releasability, as shown in FIG. 4B, a safety valve using a mold 41 in which the divided dies 42 and 43 are divided in the radial direction of the valve body 2 (left and right in the figure). As shown in FIG. 1C, a burr B is generated by a parting surface 44 parallel to the central axis 0 of the valve body 2, and this burr B Since it intersects with the cylindrical surface-shaped seal portion 8 set on the side surface of the surface 2, there is a possibility that the sealability of the seal portion 8 may be hindered. The division (partitioning) of the mold 41 is limited to the radial direction (left-right direction in the figure) because when the divided molds 42 and 43 are divided in the axial direction (vertical direction in the figure) of the valve body 2, a plate shape This is because the undercut portion by the second engaging portion 6 or the lid portion 4 is too large to be released.

これに対して、本発明のように、第一および第二係合部をボリュームの小さな突起として形成すると、設定されるアンダーカット部が小さなものとなることから、安全弁を成形するときに用いる金型としては、図９（Ｂ）に示すように、分割型４２，４３を弁本体の軸方向（図では上下方向）に分割した金型４１を用いて安全弁を金型成形することが可能となり、この場合には、弁本体の中心軸線と直交するパーティング面４４によるバリ（図示せず）が発生し、このバリは、弁本体の側面に設定される円筒面状のシール部と平行であって交差しないことから、シール部の密封性に支障を来たすことがなく、シール部に十分な密封性を確保することができる。本発明の請求項６による製造方法はこのような利点を確保すべく、安全弁を成形する金型４１はその分割型４２，４３が弁本体の軸方向（図では上下方向）に分割された金型４１を用いて安全弁を金型成形することにしたものである。   On the other hand, if the first and second engaging portions are formed as small projections with a small volume as in the present invention, the undercut portion to be set becomes small. As a mold, as shown in FIG. 9B, it is possible to mold a safety valve using a mold 41 in which the divided molds 42 and 43 are divided in the axial direction (vertical direction in the figure) of the valve body. In this case, a burr (not shown) is generated by a parting surface 44 orthogonal to the central axis of the valve body. Therefore, since it does not cross, it does not hinder the sealing performance of the seal portion, and sufficient sealing performance can be secured in the seal portion. In the manufacturing method according to claim 6 of the present invention, in order to secure such advantages, the mold 41 for molding the safety valve has a split mold 42, 43 in which the split molds 42, 43 are divided in the axial direction (vertical direction in the figure). The safety valve is molded by using the mold 41.

尚、本発明の安全弁は、圧力容器の開口を閉塞する封口板に設けた開口部に装着されるのを一般であるが、容器の仕様によっては、容器本体に設けた開口部に直接装着される場合もあり、本発明にはこの双方の場合が含まれる。また、本発明の圧力弁はその機能からして、キャップと称されることもある。   The safety valve of the present invention is generally attached to the opening provided in the sealing plate that closes the opening of the pressure vessel. However, depending on the specification of the vessel, the safety valve is directly attached to the opening provided in the vessel body. The present invention includes both cases. Moreover, the pressure valve of this invention may be called a cap from the function.

本発明は、以下の効果を奏する。   The present invention has the following effects.

すなわち、本発明の請求項１ないし４による安全弁においてはそれぞれ、上記したように圧力容器内部の圧力が弁本体に設けた圧力開放流路を経由して大気開放されるために、本発明の安全弁には、破裂部として機能する薄肉部は設けられていない。したがって、安全弁の小径化の要求に応えることができ、また安全弁を圧力開放後に再利用することができる。
また、弁開時に第二係合部が開口部の内縁に係合するために、弁開時に弁全体が外部へ離脱することがない。したがって本発明の安全弁は、使用可能箇所が限定されないものである。
以上により、本発明所期の目的どおり、安全弁の小径化の要求に応えるとともに再利用することが可能であり、しかも弁全体が外部へ離脱することがなく使用可能箇所が限定されることがない安全弁を提供することができる。 That is, in each of the safety valves according to claims 1 to 4 of the present invention, the pressure inside the pressure vessel is opened to the atmosphere via the pressure release flow path provided in the valve body as described above. Is not provided with a thin-walled portion that functions as a rupture portion. Therefore, it is possible to meet the demand for reducing the diameter of the safety valve, and the safety valve can be reused after the pressure is released.
Further, since the second engaging portion engages with the inner edge of the opening when the valve is opened, the entire valve is not detached outside when the valve is opened. Therefore, the usable part of the safety valve of the present invention is not limited.
As described above, in accordance with the intended purpose of the present invention, it is possible to meet the demand for reducing the diameter of the safety valve and to reuse it, and the entire valve is not detached to the outside and the usable portion is not limited. A safety valve can be provided.

つぎに本発明の実施例を図面にしたがって説明すると、当該実施例に係る安全弁は、圧力容器（上記したように封口板を含む）の開口部に装着されて前記開口部を閉塞するとともに前記圧力容器内部の圧力が上昇して所定値に達したときに開弁して前記圧力を開放するものであって、ゴム状弾性体の一体成形品として成形されている。   Next, an embodiment of the present invention will be described with reference to the drawings. A safety valve according to the embodiment is attached to an opening of a pressure vessel (including a sealing plate as described above) to close the opening and the pressure. When the pressure inside the container rises and reaches a predetermined value, the valve is opened to release the pressure, and is molded as an integrally molded product of a rubber-like elastic body.

その材質の具体例としては、ゴム材料では、ブチルゴム、ハロゲン化ブチルゴム、ビニル変性ブチルゴム、エチレンプロピレン系ゴム、フッ素ゴム、アクリル系ゴム、水素添加二トリルゴム等の飽和系ゴムが挙げられ、架橋剤、充填剤、可塑剤または老化防止剤等を適宜配合する。また、熱可塑性エラストマーでは、オレフィン系熱可塑系エラストマー、エステル系熱可塑性エラストマー、アミド系熱可塑性エラストマー、水素添加スチレン・ブタジエンブロック共重合体、水素添加スチレン・イソプレンブロック共重合体等が挙げられ、ブロック共重合方法、グラフト共重合方法、動的架橋方法等で製造され、架橋剤、可塑剤、老化防止剤または充填剤を適宜配合する。また、電界液との反応を小さくするため、塩素イオン・ハロゲン化物含有率が５００ｐｐｍ以下であり、重金属の含有率も１００μｇ／ｃｍ２以下が良い。 Specific examples of the material include rubber materials such as butyl rubber, halogenated butyl rubber, vinyl-modified butyl rubber, ethylene propylene rubber, fluorine rubber, acrylic rubber, hydrogenated nitrile rubber and the like, and crosslinking agents, A filler, a plasticizer, an antiaging agent or the like is appropriately blended. Examples of thermoplastic elastomers include olefin-based thermoplastic elastomers, ester-based thermoplastic elastomers, amide-based thermoplastic elastomers, hydrogenated styrene / butadiene block copolymers, and hydrogenated styrene / isoprene block copolymers. It is produced by a block copolymerization method, a graft copolymerization method, a dynamic crosslinking method or the like, and a crosslinking agent, a plasticizer, an antiaging agent or a filler is appropriately blended. In order to reduce the reaction with the electrolysis solution, the chlorine ion / halide content is preferably 500 ppm or less, and the heavy metal content is preferably 100 μg / cm 2 or less.

第一実施例・・・
図１は、本発明の第一実施例に係る安全弁１の装着前の状態を示している。この安全弁１を圧力容器３１の開口部３２に装着すると、図２に示す初期的な装着状態である弁閉状態が実現され、この図２の状態から圧力容器３１内部の圧力が上昇して所定値に達すると、図３に示す弁開状態が実現される。 First embodiment ...
FIG. 1 shows a state before the safety valve 1 according to the first embodiment of the present invention is mounted. When this safety valve 1 is attached to the opening 32 of the pressure vessel 31, the initial closed state shown in FIG. 2 is realized, and the pressure inside the pressure vessel 31 rises from the state shown in FIG. When the value is reached, the valve open state shown in FIG. 3 is realized.

当該実施例に係る安全弁１は先ず、圧力容器３１の開口部３２にその外側（図では上側）から挿入される弁本体２を有しており、この弁本体２は、開口部３２に圧入される円柱状の基部３と、この基部３の後端に一体成形された円盤状の蓋部４とを一体に有している。図２に示すように、円柱状の基部３はその側面（シール部８）をもって全周に亙って開口部３２の内面（内周面）に密接し、よって圧力容器３１内部の圧力が定常圧にあるときにこの圧力が外部へ漏出しないようシールする作用をなす。このため、基部３の根元径φＡ（図１参照）は、開口部３２の内径寸法φＢに対して
０．１×φＢ＜φＡ−φＢ＜０．４×φＢ・・・・（イ）式
を満足するように設定されている。 First, the safety valve 1 according to this embodiment has a valve body 2 that is inserted into the opening 32 of the pressure vessel 31 from the outside (upper side in the drawing). The valve body 2 is press-fitted into the opening 32. A cylindrical base 3 and a disc-shaped lid 4 integrally formed at the rear end of the base 3 are integrally provided. As shown in FIG. 2, the columnar base 3 is closely in contact with the inner surface (inner peripheral surface) of the opening 32 over the entire circumference with the side surface (seal portion 8), so that the pressure inside the pressure vessel 31 is steady. It acts to seal this pressure from leaking outside when it is under pressure. For this reason, the base diameter φA (see FIG. 1) of the base portion 3 is 0.1 × φB <φA−φB <0.4 × φB (...) with respect to the inner diameter size φB of the opening 32. It is set to be satisfied.

図２に示すように、弁本体２の基部３は、その根元まで差し込まれて蓋部４が圧力容器３１に当接したとき、基部３の先端（図では下端）は開口部３２を貫通して圧力容器３１の内部まで達する長さを有しており、このとき丁度、開口部３２の内縁（内側開口縁または穴口元とも称する）３２ａに係合する位置に第一係合部５が設けられている。   As shown in FIG. 2, when the base 3 of the valve body 2 is inserted to the base and the lid 4 comes into contact with the pressure vessel 31, the tip (lower end in the figure) of the base 3 penetrates the opening 32. The first engagement portion 5 is provided at a position where it engages with the inner edge (also referred to as an inner opening edge or a hole opening) 32a of the opening 32 at this time. It has been.

この第一係合部５は、開口部３２の内縁３２ａに係合し、圧力容器３２内部の圧力が上昇して所定値に達したときに係合が解除されて弁本体２が抜け方向（図では上方）に移動するのを許容する、すなわち開弁圧を規定するものであって、突起状ないしリブ状のものとして基部３の側面に一体成形されている。尚、図では、この第一係合部５は環状に形成されているが、必ずしも環状である必要はなく、開弁圧を規定できれば、複数の突起が円周上に並んだ形状であっても良い。また図では、この第一係合部５が上下二箇所に亙って設けられているが、その形成数は限定されず、一箇所または三箇所以上であっても良い。   The first engagement portion 5 is engaged with the inner edge 32a of the opening 32, and when the pressure inside the pressure vessel 32 rises and reaches a predetermined value, the engagement is released and the valve body 2 is pulled out ( In the figure, it is allowed to move upward), that is, regulates the valve opening pressure, and is integrally formed on the side surface of the base 3 as a protrusion or rib. In the drawing, the first engagement portion 5 is formed in an annular shape, but it is not necessarily an annular shape, and if the valve opening pressure can be defined, a plurality of protrusions are arranged on the circumference. Also good. In the figure, the first engaging portion 5 is provided at two locations in the upper and lower directions, but the number of the first engaging portions 5 is not limited and may be one or three or more.

この第一係合部５は、その外径寸法φＣを開口部３２の内径寸法φＢよりも大きく形成されており（φＣ＞φＢ、反対にφＣ＜φＢでは締め代がなくなるので荷重が受けられない）、よってこの第一係合部５が開口部３２の内縁３２ａに係合することによって初期的な弁閉状態が実現される。但し、圧力容器３１内部の圧力が上昇して所定値に達すると、この第一係合部５は基部３の側面に埋没するように弾性変形し、よって開口部３２の内縁３２ａとの係合が解除される。この係合が解除される圧力の大きさは、上記径寸法の大小比率を変更することによって調整することが可能である。   The first engaging portion 5 has an outer diameter dimension φC larger than an inner diameter dimension φB of the opening 32 (φC> φB, conversely, when φC <φB, there is no tightening allowance, so no load is received. Therefore, the initial valve closed state is realized by engaging the first engagement portion 5 with the inner edge 32a of the opening 32. However, when the pressure inside the pressure vessel 31 rises and reaches a predetermined value, the first engagement portion 5 is elastically deformed so as to be buried in the side surface of the base portion 3, and thus engages with the inner edge 32 a of the opening portion 32. Is released. The magnitude of the pressure at which this engagement is released can be adjusted by changing the size ratio of the diameter dimension.

また、基部３の側面には、第一係合部５の更に先端側に位置して、第二係合部６が設けられている。この第二係合部６は、上記第一係合部５の係合解除により弁本体２が抜け方向へ移動したときに開口部３２の内縁３２ａに係合して弁本体２が開口部３２から外方へ抜け出るのを防止するためのものであって、第一係合部５と同様、突起状ないしリブ状のものとして基部３の側面に一体成形されている。尚、図では、この第二係合部６は環状に形成されているが、必ずしも環状である必要はなく、弁本体２が抜け出るのを防止できれば、複数の突起が円周上に並んだ形状であっても良い。   A second engagement portion 6 is provided on the side surface of the base portion 3 so as to be located further on the distal end side of the first engagement portion 5. The second engagement portion 6 engages with the inner edge 32a of the opening portion 32 when the valve main body 2 moves in the removal direction due to the disengagement of the first engagement portion 5 so that the valve main body 2 is opened. And is integrally formed on the side surface of the base portion 3 in the form of a protrusion or rib like the first engagement portion 5. In the drawing, the second engaging portion 6 is formed in an annular shape, but is not necessarily in an annular shape. If the valve main body 2 can be prevented from coming out, a shape in which a plurality of protrusions are arranged on the circumference is provided. It may be.

この第二係合部６は、その外径寸法φＤを開口部３２の内径寸法φＢよりも十分に大きく形成されており（φＤ＞φＢ、反対にφＤ＜φＢでは締め代がなくなるので抜け止めができない）、よってこの第二係合部６が開口部３２の内縁３２ａに係合することによって弁本体２の抜け方向への移動が停止せしめられる。この係合は、第二係合部６の外径寸法φＤが開口部３２の内径寸法φＢよりも十分に大きく形成されているために、圧力容器３１内部の圧力が所定値に達しても係合が解除されず、よって弁本体２が開口部３２から外方へ抜け出るのを有効に防止する。この第二係合部６の外径寸法φＤと第一係合部５の外径寸法φＣとの関係は、φＤ≧φＣとなる。尚、この第二係合部６の先端面（図では下端面）は、基部３を開口部３２に圧入し易いよう先細のテーパー面状に形成されている。   The second engagement portion 6 is formed with an outer diameter dimension φD sufficiently larger than an inner diameter dimension φB of the opening 32 (φD> φB, and conversely, when φD <φB, there is no tightening allowance so that it is prevented from coming off. Therefore, when the second engaging portion 6 engages with the inner edge 32a of the opening portion 32, the movement of the valve body 2 in the removal direction is stopped. This engagement is performed even when the pressure inside the pressure vessel 31 reaches a predetermined value because the outer diameter dimension φD of the second engagement portion 6 is sufficiently larger than the inner diameter dimension φB of the opening 32. Therefore, the valve body 2 is effectively prevented from coming out of the opening 32 outward. The relationship between the outer diameter dimension φD of the second engaging portion 6 and the outer diameter dimension φC of the first engaging portion 5 is φD ≧ φC. In addition, the front end surface (lower end surface in the figure) of the second engaging portion 6 is formed in a tapered tapered shape so that the base portion 3 can be easily press-fitted into the opening portion 32.

更にまた、基部３の側面には、圧力開放流路７が、軸方向（図では上下方向）に延びるスリット状のものとして形成されている。この圧力開放流路７は、図２に示したように弁本体２が第一係合部５において係合しているときは圧力容器３１の内外を連通させず、図３に示したように弁本体２が第二係合部６において係合したときに圧力容器３１の内外を連通させるよう基部３の先端から根元手前に亙って形成されている。このため、基部３の根元部には、上記（イ）式を満足するとともに圧力開放流路７を形成されていない円筒面状のシール部８が形成されている。尚、図では、この圧力開放流路７が四箇所に亙って等配状に設けられているが、その形成数は特に限定されず、三箇所以下または五箇所以上であっても良い。   Furthermore, the pressure release flow path 7 is formed in the side surface of the base 3 as a slit-like thing extended in an axial direction (up-down direction in a figure). When the valve main body 2 is engaged in the first engagement portion 5 as shown in FIG. 2, the pressure release flow path 7 does not communicate the inside and outside of the pressure vessel 31 as shown in FIG. When the valve body 2 is engaged at the second engaging portion 6, it is formed from the tip of the base portion 3 to the front side so that the inside and outside of the pressure vessel 31 communicate with each other. For this reason, the base portion of the base portion 3 is formed with a cylindrical surface-shaped seal portion 8 that satisfies the above formula (A) and is not formed with the pressure release flow path 7. In the figure, the pressure release flow paths 7 are provided in a uniform manner over four locations, but the number of the pressure release channels 7 is not particularly limited, and may be three or less or five or more.

第二実施例・・・
上記第一実施例では、圧力開放流路７を基部３の側面に軸方向縦長のスリット状のものとして形成したが、基部３の内部に貫通穴状のものとして形成しても良く、例えば図４および図５に示すように、基部３の先端面に開口した先止まり状の縦穴９と、基部３の側面に開口した横穴１０とを交差させた組み合わせからなるものとしても良い。この場合、基部３の側面に開口した横穴１０の上下それぞれにシール部８が形成される。 Second embodiment ...
In the first embodiment, the pressure release flow path 7 is formed in the side surface of the base portion 3 as an axially elongated slit shape, but may be formed in the base portion 3 as a through-hole shape. As shown in FIGS. 4 and 5, it may be formed of a combination in which a front-end vertical hole 9 opened in the distal end surface of the base portion 3 and a horizontal hole 10 opened in the side surface of the base portion 3 intersect. In this case, seal portions 8 are formed on the upper and lower sides of the horizontal hole 10 opened on the side surface of the base portion 3.

第三実施例・・・
図６は、本発明の第三実施例に係る安全弁１の装着前の状態を示している。この安全弁１を圧力容器３１の開口部３２に装着すると、図７に示す初期的な装着状態である弁閉状態が実現され、この図７の状態から圧力容器３１内部の圧力が上昇して所定値に達すると、図８に示す弁開状態が実現される。 Third embodiment ...
FIG. 6 shows a state before the safety valve 1 according to the third embodiment of the present invention is mounted. When this safety valve 1 is attached to the opening 32 of the pressure vessel 31, the initial closed state shown in FIG. 7 is realized, and the pressure inside the pressure vessel 31 rises from the state shown in FIG. When the value is reached, the valve open state shown in FIG. 8 is realized.

当該実施例に係る安全弁１は先ず、圧力容器３１の開口部３２にその外側（図では上側）から挿入される弁本体２を有しており、この弁本体２は、開口部３２に圧入される円柱状の基部３と、この基部３の外側に一体成形された円盤状の蓋部４とを一体に有している。図７に示すように、円柱状の基部３はその側面（シール部８）をもって全周に亙って開口部３２の内面（内周面）に密接し、よって圧力容器３１内部の圧力が定常圧にあるときにこの圧力が外部へ漏出しないようシールする作用をなす。このため、基部３の根元径φＡ（図６参照）は、開口部３２の内径寸法φＢに対して
０．１×φＢ＜φＡ−φＢ＜０．４×φＢ・・・・（イ）式
を満足するように設定されている。 First, the safety valve 1 according to this embodiment has a valve body 2 that is inserted into the opening 32 of the pressure vessel 31 from the outside (upper side in the drawing). The valve body 2 is press-fitted into the opening 32. A cylindrical base 3 and a disc-shaped lid 4 integrally formed outside the base 3 are integrally provided. As shown in FIG. 7, the columnar base 3 has its side surface (seal portion 8) in close contact with the inner surface (inner peripheral surface) of the opening 32 over the entire circumference, so that the pressure inside the pressure vessel 31 is steady. It acts to seal this pressure from leaking outside when it is under pressure. For this reason, the base diameter φA (see FIG. 6) of the base portion 3 is expressed by the following equation with respect to the inner diameter dimension φB of the opening 32: 0.1 × φB <φA−φB <0.4 × φB It is set to be satisfied.

図７に示すように、弁本体２の基部３は、その根元まで差し込まれて蓋部４が圧力容器３１に当接したとき、基部３の先端（図では下端）は開口部３２を貫通して圧力容器３１の内部まで達する長さを有しており、このとき丁度、開口部３２の内縁（内側開口縁または穴口元とも称する）３２ａに係合する位置に第一係合部５が設けられている。   As shown in FIG. 7, when the base portion 3 of the valve body 2 is inserted to the base and the lid portion 4 comes into contact with the pressure vessel 31, the distal end (lower end in the figure) of the base portion 3 penetrates the opening portion 32. The first engagement portion 5 is provided at a position where it engages with the inner edge (also referred to as an inner opening edge or a hole opening) 32a of the opening 32 at this time. It has been.

この第一係合部５は、開口部３２の内縁３２ａに係合して当該安全弁１を初期的な弁閉状態に維持し、かつ圧力容器３２内部の圧力が上昇して所定値に達したときに係合が解除されて弁本体２が抜け方向（図では上方）に移動するのを許容する、すなわち開弁圧を規定するものであって、突起状ないしリブ状のものとして基部３の側面に一体成形されている。尚、図では、この第一係合部５は環状に形成されているが、必ずしも環状である必要はなく、開弁圧を規定できれば、複数の突起が円周上に並んだ形状であっても良い。   The first engagement portion 5 engages with the inner edge 32a of the opening 32 to maintain the safety valve 1 in the initial valve closed state, and the pressure inside the pressure vessel 32 increases to reach a predetermined value. Sometimes the engagement is released and the valve body 2 is allowed to move in the direction of withdrawal (upward in the drawing), that is, the valve opening pressure is regulated, and the base 3 is formed as a protrusion or rib. It is integrally molded on the side. In the drawing, the first engagement portion 5 is formed in an annular shape, but it is not necessarily an annular shape, and if the valve opening pressure can be defined, a plurality of protrusions are arranged on the circumference. Also good.

この第一係合部５は、その外径寸法φＣを開口部３２の内径寸法φＢよりも大きく形成されており（φＣ＞φＢ、反対にφＣ＜φＢでは締め代がなくなるので荷重が受けられない）、よってこの第一係合部５が開口部３２の内縁３２ａに係合することによって初期的な弁閉状態が実現される。但し、圧力容器３１内部の圧力が上昇して所定値に達すると、この第一係合部５は基部３の側面に埋没するように弾性変形し、よって開口部３２の内縁３２ａとの係合が解除される。この係合が解除される圧力の大きさは、上記径寸法の大小比率を変更することによって調整することが可能である。   The first engaging portion 5 has an outer diameter dimension φC larger than an inner diameter dimension φB of the opening 32 (φC> φB, conversely, when φC <φB, there is no tightening allowance, so no load is received. Therefore, the initial valve closed state is realized by engaging the first engagement portion 5 with the inner edge 32a of the opening 32. However, when the pressure inside the pressure vessel 31 rises and reaches a predetermined value, the first engagement portion 5 is elastically deformed so as to be buried in the side surface of the base portion 3, and thus engages with the inner edge 32 a of the opening portion 32. Is released. The magnitude of the pressure at which this engagement is released can be adjusted by changing the size ratio of the diameter dimension.

また、第一係合部５よりも先端側に位置して基部３の先端部にはその一部として円柱状を呈する接続部１１が一体成形されており、この接続部１１の先端外周に第二係合部６が設けられている。この第二係合部６は、上記第一係合部５の係合解除により弁本体２が抜け方向へ移動したときに開口部３２の内縁３２ａに係合して弁本体２が開口部３２から外方へ抜け出るのを防止するためのものであって、第一係合部５と同様、突起状ないしリブ状のものとして基部３の側面に一体成形されている。尚、図では、この第二係合部６は環状に形成されているが、必ずしも環状である必要はなく、弁本体２が抜け出るのを防止できれば、複数の突起が円周上に並んだ形状であっても良い。   Further, a connecting portion 11 having a columnar shape is integrally formed as a part of the distal end portion of the base portion 3 located on the distal end side with respect to the first engaging portion 5. Two engaging portions 6 are provided. The second engagement portion 6 engages with the inner edge 32a of the opening portion 32 when the valve main body 2 moves in the removal direction due to the disengagement of the first engagement portion 5 so that the valve main body 2 is opened. And is integrally formed on the side surface of the base portion 3 in the form of a protrusion or rib like the first engagement portion 5. In the drawing, the second engaging portion 6 is formed in an annular shape, but is not necessarily in an annular shape. If the valve main body 2 can be prevented from coming out, a shape in which a plurality of protrusions are arranged on the circumference is provided. It may be.

この第二係合部６は、その外径寸法φＤを開口部３２の内径寸法φＢよりも十分に大きく形成されており（φＤ＞φＢ、反対にφＤ＜φＢでは締め代がなくなるので抜け止めができない）、よってこの第二係合部６が開口部３２の内縁３２ａに係合することによって弁本体２の抜け方向への移動が停止せしめられる。この係合は、第二係合部６の外径寸法φＤが開口部３２の内径寸法φＢよりも十分に大きく形成されているために、圧力容器３１内部の圧力が所定値に達しても解除されず、よって弁本体２が開口部３２から外方へ抜け出るのを有効に防止する。この第二係合部６の外径寸法φＤと第一係合部５の外径寸法φＣとの関係は、φＤ≧φＣとなる。尚、この第二係合部６の先端面（図では下端面）は、弁本体２を開口部３２に圧入し易いよう先細のテーパー面状に形成されている。   The second engagement portion 6 is formed with an outer diameter dimension φD sufficiently larger than an inner diameter dimension φB of the opening 32 (φD> φB, and conversely, when φD <φB, there is no tightening allowance so that it is prevented from coming off. Therefore, when the second engaging portion 6 engages with the inner edge 32a of the opening portion 32, the movement of the valve body 2 in the removal direction is stopped. This engagement is released even if the pressure inside the pressure vessel 31 reaches a predetermined value because the outer diameter dimension φD of the second engagement portion 6 is sufficiently larger than the inner diameter dimension φB of the opening 32. Thus, the valve body 2 is effectively prevented from coming out of the opening 32 outward. The relationship between the outer diameter dimension φD of the second engaging portion 6 and the outer diameter dimension φC of the first engaging portion 5 is φD ≧ φC. In addition, the front end surface (the lower end surface in the figure) of the second engagement portion 6 is formed in a tapered shape that is easy to press-fit the valve body 2 into the opening 32.

上記接続部１１は、その軸方向長さ（両係合部５，６間の軸方向間隔）Ｅを開口部３２の穴長さＦよりも大きく形成されており（Ｅ＞Ｆ）、かつその外径寸法φＧを開口部３２の内径寸法φＢよりも小さく形成されている（φＧ＜φＢ）。したがって、図８に示したように、弁本体２が第二係合部６において開口部３２の内縁３２ａに係合すると、接続部１１は開口部３２の内部に位置し、接続部１１の側面と開口部３２の内面との間に環状の間隙１２が形成され、かつ第一係合部５が開口部３２から外方へ外れて第一係合部５および容器３１間にも環状の間隙１３が形成されるため、この両間隙１２，１３をもって当該安全弁１の圧力開放流路７が形成される。尚、第二係合部６が環状であると、この第二係合部６が開口部３２の内縁３２ａに密接することにより圧力開放流路７が閉塞されてしまうため、第二係合部６にはその円周上一箇所以上の部位に切欠状の連通部１４が設けられている。したがって、この連通部１４を加えれば、圧力開放流路７は、連通部１４および両間隙１２，１３によって構成されることになる。   The connecting portion 11 is formed such that its axial length (axial distance between the engaging portions 5 and 6) E is larger than the hole length F of the opening 32 (E> F), and The outer diameter dimension φG is smaller than the inner diameter dimension φB of the opening 32 (φG <φB). Therefore, as shown in FIG. 8, when the valve main body 2 is engaged with the inner edge 32 a of the opening 32 in the second engagement portion 6, the connection portion 11 is positioned inside the opening 32 and the side surface of the connection portion 11. An annular gap 12 is formed between the first engagement portion 5 and the container 31 between the first engagement portion 5 and the container 31. 13 is formed, the pressure release flow path 7 of the safety valve 1 is formed by the gaps 12 and 13. If the second engagement portion 6 is annular, the pressure release flow path 7 is closed when the second engagement portion 6 comes into close contact with the inner edge 32a of the opening 32. 6 is provided with a notch-like communication portion 14 at one or more locations on the circumference thereof. Therefore, if this communication part 14 is added, the pressure release flow path 7 is constituted by the communication part 14 and both the gaps 12 and 13.

上記第一ないし第三実施例の安全弁１はそれぞれ、圧力容器３１の開口部３２に装着されてこの開口部３２を閉塞するとともに圧力容器３１内部の圧力が上昇して所定値に達したときに開弁して圧力を開放し、もって圧力容器３１の防爆作用をなすものであって、上記構成により以下の作用効果を奏する点に特徴を有している。   Each of the safety valves 1 of the first to third embodiments is mounted on the opening 32 of the pressure vessel 31 to close the opening 32 and the pressure inside the pressure vessel 31 rises to reach a predetermined value. The valve is opened to release the pressure, thereby making the pressure vessel 31 explosion-proof. The above-described configuration has the following effects.

すなわち先ず、上記構成の安全弁１においては、圧力容器３１の開口部３２に弁本体２を挿入するが、このとき、この弁本体２の先端に設けた第一係合部５が開口部３２の内縁３２ａに係合するので、初期的な装着状態である弁閉状態が実現される。第一係合部５は、圧力容器３１内部の圧力が上昇して所定値に達したときに係合が解除されて弁本体２が抜け方向へ移動するのを許容するよう設定されているので、圧力が所定値に達すると、係合が解除されて弁本体２が抜け方向へ移動する。移動した弁本体２は引きつづき、弁本体２の更に先端に設けた第二係合部６が開口部３２の内縁３２ａに係合することにより停止し、よってこの第二係合部６の係合により開口部３２から抜け止めされる。また、弁本体２には、この移動停止位置にて圧力容器３１の内外を連通させる圧力開放流路７が設けられているので、圧力容器３１内部の高圧はこの圧力開放流路７を経由して大気開放される。   That is, first, in the safety valve 1 configured as described above, the valve body 2 is inserted into the opening 32 of the pressure vessel 31. At this time, the first engagement portion 5 provided at the tip of the valve body 2 is the opening 32. Since it engages with the inner edge 32a, a valve closed state, which is an initial mounting state, is realized. Since the first engagement portion 5 is set so as to allow the valve body 2 to move in the disengagement direction when the pressure inside the pressure vessel 31 rises and reaches a predetermined value. When the pressure reaches a predetermined value, the engagement is released and the valve body 2 moves in the removal direction. The moved valve body 2 continues to be stopped when the second engagement portion 6 provided at the further tip of the valve body 2 is engaged with the inner edge 32a of the opening portion 32, and thus the engagement of the second engagement portion 6 is stopped. It is prevented from coming off from the opening 32 by the combination. Further, since the valve body 2 is provided with a pressure release channel 7 for communicating the inside and outside of the pressure vessel 31 at this movement stop position, the high pressure inside the pressure vessel 31 passes through the pressure release channel 7. Open to the atmosphere.

したがって、上記構成の安全弁１によれば先ずは、上記したように圧力容器３１内部の圧力が弁本体２に設けられた圧力開放流路７を経由して大気開放されるので、当該安全弁１には上記従来技術のような薄肉部は設けられていない。したがって、安全弁の小径化の要求に応えることができ、かつ圧力開放後に再利用することができる。
またこれに加えて、弁開時には第二係合部６が開口部３２の内縁３２ａに係合するので、当該安全弁１は弁開時に弁全体が外部へ離脱することがない。したがって、使用可能箇所が限定されることがない。
以上により、本発明所期の目的どおり、小径化の要求に応えるとともに再利用することができ、しかも弁開時に弁全体が外部へ離脱することがなく使用可能箇所が限定されることがない安全弁１を提供することができる。 Therefore, according to the safety valve 1 having the above configuration, first, the pressure inside the pressure vessel 31 is released to the atmosphere via the pressure release flow path 7 provided in the valve body 2 as described above. Is not provided with a thin-walled portion as in the prior art. Therefore, it is possible to meet the demand for reducing the diameter of the safety valve and to reuse it after the pressure is released.
In addition, since the second engaging portion 6 engages with the inner edge 32a of the opening 32 when the valve is opened, the safety valve 1 does not leave the entire valve outside when the valve is opened. Therefore, the usable location is not limited.
As described above, in accordance with the intended purpose of the present invention, a safety valve that can meet the demand for a smaller diameter and can be reused, and that does not leave the entire valve outside when the valve is opened and does not limit the usable points. 1 can be provided.

第四実施例・・・
つぎに、上記第三実施例に係る安全弁の製造方法について説明すると、以下のとおりである。尚、当該第四実施例は、上記第三実施例に係る安全弁を製造する方法を示しているが、その他の形状の安全弁についても同様である。 Fourth embodiment ...
Next, a method for manufacturing the safety valve according to the third embodiment will be described as follows. In addition, although the said 4th Example has shown the method of manufacturing the safety valve which concerns on the said 3rd Example, it is the same also about the safety valve of another shape.

すなわち、比較例として示す図９（Ａ）のように、安全弁を成形する金型４１として、分割型４２，４３が弁本体２の径方向（図では左右方向）に分割された金型４１を用いて安全弁１を成形すると、弁本体２の中心軸線と平行なパーティング面４４によるバリが発生し、このバリは、弁本体２の側面に設定される円筒面状のシール部８と交差することから、シール部８の密封性に支障を来たす虞があることは上記したとおりである。   That is, as shown in FIG. 9A as a comparative example, as a mold 41 for molding a safety valve, a mold 41 in which split molds 42 and 43 are divided in the radial direction of the valve body 2 (left and right in the figure) is used. When the safety valve 1 is molded by using it, a burr due to a parting surface 44 parallel to the central axis of the valve body 2 is generated, and this burr intersects with a cylindrical seal portion 8 set on the side surface of the valve body 2. Therefore, as described above, there is a possibility that the sealing performance of the seal portion 8 may be hindered.

これに対して、当該第四実施例として示す図９（Ｂ）のように、安全弁を成形する金型４１として、分割型４２，４３が弁本体２の径方向ではなく軸方向（図では上下方向）に分割された金型４１を用いて安全弁１を成形すると、弁本体２の中心軸線と直交するパーティング面４４によるバリが発生し、このバリは、弁本体２の側面に設定される円筒面状のシール部８と平行であって交差しないことから、シール部８の密封性に支障を来たすことがなく、シール部８に十分な密封性を確保することができる。尚、図では、パーティング面４４は、弁本体２における基部３と蓋部４の境界に沿って配置されているが、シール部８の領内でなければ、その位置は限定されない。   On the other hand, as shown in FIG. 9B showing the fourth embodiment, as the mold 41 for molding the safety valve, the split dies 42 and 43 are not in the radial direction of the valve body 2 but in the axial direction (up and down in the figure). When the safety valve 1 is molded using the mold 41 divided in the direction), burrs are generated by the parting surface 44 orthogonal to the central axis of the valve body 2, and these burrs are set on the side surface of the valve body 2. Since the seal portion 8 is parallel to and does not intersect with the cylindrical surface-shaped seal portion 8, the seal portion 8 can be sufficiently sealed without impeding the sealability of the seal portion 8. In the figure, the parting surface 44 is disposed along the boundary between the base 3 and the lid 4 in the valve body 2, but the position thereof is not limited as long as it is not within the region of the seal portion 8.

したがって、当該方法によれば、安全弁１を金型成形するときに発生するバリがシール部８である弁本体２の側面と交差しないため、バリが発生しても、安全弁１の密封性に悪影響を及ぼすことがない。したがって、優れた密封性を発揮することが可能な安全弁１を提供することができる。   Therefore, according to this method, since the burr generated when the safety valve 1 is molded does not intersect the side surface of the valve body 2 that is the seal portion 8, even if the burr occurs, the sealing performance of the safety valve 1 is adversely affected. Will not affect. Therefore, the safety valve 1 capable of exhibiting excellent sealing performance can be provided.

本発明の第一実施例に係る安全弁の装着前の状態を示す正面図The front view which shows the state before mounting | wearing of the safety valve which concerns on 1st Example of this invention. 同安全弁の装着時弁閉状態を示す断面図Sectional view showing the valve closed when the safety valve is installed 同安全弁の装着時弁開状態を示す断面図Sectional view showing the valve open state when the safety valve is installed 本発明の第二実施例に係る安全弁の装着時弁閉状態を示す断面図Sectional drawing which shows the valve closing state at the time of mounting | wearing of the safety valve which concerns on 2nd Example of this invention. 同安全弁の装着時弁開状態を示す断面図Sectional view showing the valve open state when the safety valve is installed 本発明の第三実施例に係る安全弁の装着前の状態を示す正面図The front view which shows the state before mounting | wearing of the safety valve which concerns on 3rd Example of this invention. 同安全弁の装着時弁閉状態を示す断面図Sectional view showing the valve closed when the safety valve is installed 同安全弁の装着時弁開状態を示す断面図Sectional view showing the valve open state when the safety valve is installed （Ａ）は比較例に係る製造方法の実施に使用する金型の要部断面図、（Ｂ）は本発明の第四実施例に係る製造方法の実施に使用する金型の要部断面図(A) is principal part sectional drawing of the metal mold | die used for implementation of the manufacturing method which concerns on a comparative example, (B) is principal part sectional drawing of the metal mold | die used for implementation of the manufacturing method which concerns on 4th Example of this invention. 従来例に係る安全弁の装着状態を示す断面図Sectional drawing which shows the mounting state of the safety valve which concerns on a prior art example 他の従来例に係る安全弁の装着状態を示す断面図Sectional drawing which shows the mounting state of the safety valve which concerns on another prior art example （Ａ）は比較例に係る安全弁の断面図、（Ｂ）は同安全弁の製造の実施に使用する金型の要部断面図、（Ｃ）は成形品の仕上がり状態を示す説明図(A) is sectional drawing of the safety valve which concerns on a comparative example, (B) is principal part sectional drawing of the metal mold | die used for implementation of manufacture of the safety valve, (C) is explanatory drawing which shows the finishing state of a molded article

符号の説明Explanation of symbols

１ 安全弁
２ 弁本体
３ 基部
４ 蓋部
５ 第一係合部
６ 第二係合部
７ 圧力開放流路
８ シール部
９ 縦穴
１０ 横穴
１１ 接続部
１２，１３ 間隙
１４ 連通部
３１ 圧力容器
３２ 開口部
３２ａ 内縁
４１ 金型
４２，４３ 分割型
４４ パーティング面 DESCRIPTION OF SYMBOLS 1 Safety valve 2 Valve body 3 Base part 4 Lid part 5 First engagement part 6 Second engagement part 7 Pressure release flow path 8 Seal part 9 Vertical hole 10 Horizontal hole 11 Connection part 12, 13 Gap 14 Communication part 31 Pressure vessel 32 Opening part 32a Inner edge 41 Die 42, 43 Split type 44 Parting surface

Claims (4)

圧力容器（３１）の開口部（３２）に装着されて前記開口部（３２）を閉塞するとともに前記圧力容器（３１）内部の圧力が所定値に達したときに開弁して前記圧力を開放する安全弁（１）において、
前記開口部（３２）に挿入される弁本体（２）と、
前記弁本体（２）の側面に設けられ、前記開口部（３２）の内縁（３２ａ）に係合し、前記圧力が所定値に達したときに前記係合が外れて前記弁本体（２）が抜け方向に移動するのを許容する第一係合部（５）と、
前記第一係合部（５）の先端側に設けられ、前記弁本体（２）が抜け方向に移動したときに前記開口部（３２）の内縁（３２ａ）に係合して前記弁本体（２）が前記開口部（３２）から抜け出るのを防止する第二係合部（６）と、
前記弁本体（２）が前記第一係合部（５）にて係合しているときは前記圧力容器（３１）の内外を連通させず前記弁本体（２）が前記第二係合部（６）にて係合したときに前記圧力容器（３１）の内外を連通させる圧力開放流路（７）とを有することを特徴とする安全弁。 The pressure vessel (31) is attached to the opening (32) to close the opening (32) and opens when the pressure inside the pressure vessel (31) reaches a predetermined value to release the pressure. In the safety valve (1)
A valve body (2) inserted into the opening (32);
The valve body (2) is provided on a side surface of the valve body (2), engages with an inner edge (32a) of the opening (32), and disengages when the pressure reaches a predetermined value. A first engagement part (5) that allows the movement of the
Provided on the distal end side of the first engaging portion (5), when the valve main body (2) moves in the removal direction, it engages with the inner edge (32a) of the opening (32) and the valve main body ( A second engaging portion (6) for preventing 2) from coming out of the opening (32);
When the valve body (2) is engaged at the first engagement portion (5), the valve body (2) is not communicated with the second engagement portion without communicating the inside and outside of the pressure vessel (31). A safety valve having a pressure release flow path (7) for communicating the inside and outside of the pressure vessel (31) when engaged in (6). 請求項１の安全弁において、
圧力開放流路（７）は、弁本体（２）の側面に形成したスリットよりなることを特徴とする安全弁。 The safety valve of claim 1,
The pressure relief flow path (7) is a safety valve characterized by comprising a slit formed in the side surface of the valve body (2). 請求項１の安全弁において、
圧力開放流路（７）は、弁本体（２）の内部に形成するとともに先端面および側面に開口する貫通穴よりなることを特徴とする安全弁。 The safety valve of claim 1,
The pressure relief flow path (7) is formed in the valve main body (2), and includes a through hole that opens to a front end face and a side face. 請求項１の安全弁において、
圧力開放流路（７）は、第一および第二係合部（５）（６）間に一体成形した接続部（１１）の外径寸法（φＧ）が開口部（３２）の穴径（φＢ）よりも小さく形成されることにより前記接続部（１１）の外周に設定されることを特徴とする安全弁。 The safety valve of claim 1,
In the pressure release channel (7), the outer diameter dimension (φG) of the connecting portion (11) formed integrally between the first and second engaging portions (5) and (6) is the hole diameter of the opening portion (32) ( A safety valve characterized in that it is set on the outer periphery of the connecting part (11) by being formed smaller than φB).
JP2005311159A 2005-10-26 2005-10-26 Safety valve and its manufacturing method Withdrawn JP2007120557A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9044189B2 (en) 2011-05-24 2015-06-02 Siemens Aktiengesellschaft Method and computed tomography system for generating weighted tomographic image datasets

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9044189B2 (en) 2011-05-24 2015-06-02 Siemens Aktiengesellschaft Method and computed tomography system for generating weighted tomographic image datasets

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